(please ignore last posting, git send-email got hold of the
wrong directory...)
Hi,
Round 6 of the sg chaining patch set. Changes since v5:
- Support for more architectures. It should now run and work on
i386, x86-64, sparc, sparc64, ia64, and ppc (32 and 64-bit).
I have only tested i386/x86-64/ppc64 myself.
- Large command support is now automatically enabled by the
SCSI mid layer, if the arch supports sg chaining. The debug
queue entry in /sys/block/<dev>/queue/max_segments still exists
if you want to tweak it further. The default limit is now
2048 entries, or at least 8mb ios. Remember that you still need
to tweak the soft limit to allow the block layer to build large
commands, that is the max_sectors_kb variable in the same directory.
- Add kerneldoc documentation to scatterlist.h
It's solid here, so please give it a spin. I'd like to get some
performance results as well, if someone feels inclined to do so.
arch/ia64/hp/common/sba_iommu.c | 14 -
arch/ia64/hp/sim/simscsi.c | 23 +-
arch/ia64/sn/pci/pci_dma.c | 11 -
arch/powerpc/kernel/dma_64.c | 5
arch/powerpc/kernel/ibmebus.c | 11 -
arch/powerpc/kernel/iommu.c | 18 +
arch/powerpc/platforms/ps3/system-bus.c | 5
arch/sparc/kernel/ioport.c | 25 +-
arch/sparc/mm/io-unit.c | 12 -
arch/sparc/mm/iommu.c | 10
arch/sparc/mm/sun4c.c | 10
arch/sparc64/kernel/pci_iommu.c | 39 ++-
arch/sparc64/kernel/pci_sun4v.c | 32 +-
arch/sparc64/kernel/sbus.c | 44 ++--
arch/x86_64/kernel/pci-calgary.c | 25 +-
arch/x86_64/kernel/pci-gart.c | 60 ++---
arch/x86_64/kernel/pci-nommu.c | 5
block/ll_rw_blk.c | 42 +++
crypto/digest.c | 2
crypto/scatterwalk.c | 2
crypto/scatterwalk.h | 2
drivers/ata/libata-core.c | 30 +-
drivers/ide/cris/ide-cris.c | 3
drivers/ide/ide-dma.c | 2
drivers/ide/ide-taskfile.c | 17 +
drivers/ide/mips/au1xxx-ide.c | 2
drivers/ide/pci/sgiioc4.c | 2
drivers/ide/ppc/pmac.c | 2
drivers/infiniband/hw/ipath/ipath_dma.c | 9
drivers/infiniband/ulp/iser/iser_memory.c | 75 +++---
drivers/infiniband/ulp/srp/ib_srp.c | 22 +-
drivers/message/fusion/mptscsih.c | 4
drivers/scsi/3w-9xxx.c | 8
drivers/scsi/3w-xxxx.c | 8
drivers/scsi/53c700.c | 16 -
drivers/scsi/BusLogic.c | 7
drivers/scsi/NCR53c406a.c | 18 -
drivers/scsi/a100u2w.c | 9
drivers/scsi/aacraid/aachba.c | 29 +-
drivers/scsi/advansys.c | 21 -
drivers/scsi/aha1542.c | 21 -
drivers/scsi/aha1740.c | 8
drivers/scsi/aic7xxx/aic79xx_osm.c | 3
drivers/scsi/aic7xxx/aic7xxx_osm.c | 12 -
drivers/scsi/aic94xx/aic94xx_task.c | 6
drivers/scsi/arcmsr/arcmsr_hba.c | 11 -
drivers/scsi/dc395x.c | 7
drivers/scsi/dpt_i2o.c | 13 -
drivers/scsi/eata.c | 8
drivers/scsi/esp_scsi.c | 5
drivers/scsi/gdth.c | 45 ++--
drivers/scsi/hptiop.c | 8
drivers/scsi/ibmmca.c | 11 -
drivers/scsi/ibmvscsi/ibmvscsi.c | 4
drivers/scsi/ide-scsi.c | 31 +-
drivers/scsi/initio.c | 12 -
drivers/scsi/ipr.c | 9
drivers/scsi/ips.c | 74 +++---
drivers/scsi/iscsi_tcp.c | 43 ++-
drivers/scsi/jazz_esp.c | 27 +-
drivers/scsi/lpfc/lpfc_scsi.c | 9
drivers/scsi/mac53c94.c | 9
drivers/scsi/megaraid.c | 13 -
drivers/scsi/megaraid/megaraid_mbox.c | 7
drivers/scsi/megaraid/megaraid_sas.c | 16 -
drivers/scsi/mesh.c | 12 -
drivers/scsi/ncr53c8xx.c | 7
drivers/scsi/nsp32.c | 9
drivers/scsi/pcmcia/sym53c500_cs.c | 18 -
drivers/scsi/qla1280.c | 66 +++---
drivers/scsi/qla2xxx/qla_iocb.c | 9
drivers/scsi/qla4xxx/ql4_iocb.c | 8
drivers/scsi/qlogicfas408.c | 9
drivers/scsi/qlogicpti.c | 15 -
drivers/scsi/scsi_debug.c | 29 +-
drivers/scsi/scsi_lib.c | 239 ++++++++++++++++------
drivers/scsi/scsi_tgt_lib.c | 4
drivers/scsi/sg.c | 16 -
drivers/scsi/sym53c416.c | 9
drivers/scsi/sym53c8xx_2/sym_glue.c | 7
drivers/scsi/u14-34f.c | 10
drivers/scsi/ultrastor.c | 10
drivers/scsi/wd7000.c | 7
drivers/usb/storage/alauda.c | 16 -
drivers/usb/storage/datafab.c | 10
drivers/usb/storage/jumpshot.c | 10
drivers/usb/storage/protocol.c | 20 +
drivers/usb/storage/protocol.h | 2
drivers/usb/storage/sddr09.c | 16 -
drivers/usb/storage/sddr55.c | 16 -
drivers/usb/storage/shuttle_usbat.c | 17 -
include/asm-i386/dma-mapping.h | 13 -
include/asm-i386/scatterlist.h | 2
include/asm-ia64/dma-mapping.h | 1
include/asm-ia64/scatterlist.h | 2
include/asm-powerpc/dma-mapping.h | 2
include/asm-powerpc/scatterlist.h | 2
include/asm-sparc/scatterlist.h | 2
include/asm-sparc64/scatterlist.h | 2
include/asm-x86_64/dma-mapping.h | 3
include/asm-x86_64/scatterlist.h | 2
include/linux/i2o.h | 2
include/linux/ide.h | 2
include/linux/libata.h | 16 -
include/linux/scatterlist.h | 84 +++++++
include/scsi/scsi.h | 7
include/scsi/scsi_cmnd.h | 3
lib/swiotlb.c | 19 +
108 files changed, 1104 insertions(+), 744 deletions(-)
Convert the main rq mapper (blk_rq_map_sg()) to the sg helper setup.
Signed-off-by: Jens Axboe <[email protected]>
---
block/ll_rw_blk.c | 19 ++++++++++++-------
1 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 6b5173a..7d801cf 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -30,6 +30,7 @@
#include <linux/cpu.h>
#include <linux/blktrace_api.h>
#include <linux/fault-inject.h>
+#include <linux/scatterlist.h>
/*
* for max sense size
@@ -1307,9 +1308,11 @@ static int blk_hw_contig_segment(request_queue_t *q, struct bio *bio,
* map a request to scatterlist, return number of sg entries setup. Caller
* must make sure sg can hold rq->nr_phys_segments entries
*/
-int blk_rq_map_sg(request_queue_t *q, struct request *rq, struct scatterlist *sg)
+int blk_rq_map_sg(request_queue_t *q, struct request *rq,
+ struct scatterlist *sglist)
{
struct bio_vec *bvec, *bvprv;
+ struct scatterlist *next_sg, *sg;
struct bio *bio;
int nsegs, i, cluster;
@@ -1320,6 +1323,7 @@ int blk_rq_map_sg(request_queue_t *q, struct request *rq, struct scatterlist *sg
* for each bio in rq
*/
bvprv = NULL;
+ sg = next_sg = &sglist[0];
rq_for_each_bio(bio, rq) {
/*
* for each segment in bio
@@ -1328,7 +1332,7 @@ int blk_rq_map_sg(request_queue_t *q, struct request *rq, struct scatterlist *sg
int nbytes = bvec->bv_len;
if (bvprv && cluster) {
- if (sg[nsegs - 1].length + nbytes > q->max_segment_size)
+ if (sg->length + nbytes > q->max_segment_size)
goto new_segment;
if (!BIOVEC_PHYS_MERGEABLE(bvprv, bvec))
@@ -1336,14 +1340,15 @@ int blk_rq_map_sg(request_queue_t *q, struct request *rq, struct scatterlist *sg
if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bvec))
goto new_segment;
- sg[nsegs - 1].length += nbytes;
+ sg->length += nbytes;
} else {
new_segment:
- memset(&sg[nsegs],0,sizeof(struct scatterlist));
- sg[nsegs].page = bvec->bv_page;
- sg[nsegs].length = nbytes;
- sg[nsegs].offset = bvec->bv_offset;
+ sg = next_sg;
+ next_sg = sg_next(sg);
+ sg->page = bvec->bv_page;
+ sg->length = nbytes;
+ sg->offset = bvec->bv_offset;
nsegs++;
}
bvprv = bvec;
--
1.5.2.rc1
First step to being able to change the scatterlist setup without
having to modify drivers (a lot :-)
Signed-off-by: Jens Axboe <[email protected]>
---
include/linux/scatterlist.h | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 4efbd9c..bed5ab4 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -20,4 +20,13 @@ static inline void sg_init_one(struct scatterlist *sg, const void *buf,
sg_set_buf(sg, buf, buflen);
}
+#define sg_next(sg) ((sg) + 1)
+#define sg_last(sg, nents) (&(sg[(nents) - 1]))
+
+/*
+ * Loop over each sg element, following the pointer to a new list if necessary
+ */
+#define for_each_sg(sglist, sg, nr, __i) \
+ for (__i = 0, sg = (sglist); __i < (nr); __i++, sg = sg_next(sg))
+
#endif /* _LINUX_SCATTERLIST_H */
--
1.5.2.rc1
It's a subsystem function, prefix it as such.
Signed-off-by: Jens Axboe <[email protected]>
---
crypto/digest.c | 2 +-
crypto/scatterwalk.c | 2 +-
crypto/scatterwalk.h | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/crypto/digest.c b/crypto/digest.c
index 1bf7414..e56de67 100644
--- a/crypto/digest.c
+++ b/crypto/digest.c
@@ -77,7 +77,7 @@ static int update2(struct hash_desc *desc,
if (!nbytes)
break;
- sg = sg_next(sg);
+ sg = scatterwalk_sg_next(sg);
}
return 0;
diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c
index 81afd17..2e51f82 100644
--- a/crypto/scatterwalk.c
+++ b/crypto/scatterwalk.c
@@ -70,7 +70,7 @@ static void scatterwalk_pagedone(struct scatter_walk *walk, int out,
walk->offset += PAGE_SIZE - 1;
walk->offset &= PAGE_MASK;
if (walk->offset >= walk->sg->offset + walk->sg->length)
- scatterwalk_start(walk, sg_next(walk->sg));
+ scatterwalk_start(walk, scatterwalk_sg_next(walk->sg));
}
}
diff --git a/crypto/scatterwalk.h b/crypto/scatterwalk.h
index f1592cc..e049c62 100644
--- a/crypto/scatterwalk.h
+++ b/crypto/scatterwalk.h
@@ -20,7 +20,7 @@
#include "internal.h"
-static inline struct scatterlist *sg_next(struct scatterlist *sg)
+static inline struct scatterlist *scatterwalk_sg_next(struct scatterlist *sg)
{
return (++sg)->length ? sg : (void *)sg->page;
}
--
1.5.2.rc1
This converts libata to using the sg helpers for looking up sg
elements, instead of doing it manually.
Signed-off-by: Jens Axboe <[email protected]>
---
drivers/ata/libata-core.c | 30 ++++++++++++++++--------------
include/linux/libata.h | 16 ++++++++++------
2 files changed, 26 insertions(+), 20 deletions(-)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 4166407..32c8d14 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1376,7 +1376,7 @@ static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
*/
unsigned ata_exec_internal_sg(struct ata_device *dev,
struct ata_taskfile *tf, const u8 *cdb,
- int dma_dir, struct scatterlist *sg,
+ int dma_dir, struct scatterlist *sgl,
unsigned int n_elem)
{
struct ata_port *ap = dev->ap;
@@ -1434,11 +1434,12 @@ unsigned ata_exec_internal_sg(struct ata_device *dev,
qc->dma_dir = dma_dir;
if (dma_dir != DMA_NONE) {
unsigned int i, buflen = 0;
+ struct scatterlist *sg;
- for (i = 0; i < n_elem; i++)
- buflen += sg[i].length;
+ for_each_sg(sgl, sg, n_elem, i)
+ buflen += sg->length;
- ata_sg_init(qc, sg, n_elem);
+ ata_sg_init(qc, sgl, n_elem);
qc->nbytes = buflen;
}
@@ -4008,7 +4009,7 @@ void ata_sg_clean(struct ata_queued_cmd *qc)
if (qc->n_elem)
dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
/* restore last sg */
- sg[qc->orig_n_elem - 1].length += qc->pad_len;
+ sg_last(sg, qc->orig_n_elem)->length += qc->pad_len;
if (pad_buf) {
struct scatterlist *psg = &qc->pad_sgent;
void *addr = kmap_atomic(psg->page, KM_IRQ0);
@@ -4167,6 +4168,7 @@ void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
qc->orig_n_elem = 1;
qc->buf_virt = buf;
qc->nbytes = buflen;
+ qc->cursg = qc->__sg;
sg_init_one(&qc->sgent, buf, buflen);
}
@@ -4192,6 +4194,7 @@ void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
qc->__sg = sg;
qc->n_elem = n_elem;
qc->orig_n_elem = n_elem;
+ qc->cursg = qc->__sg;
}
/**
@@ -4281,7 +4284,7 @@ static int ata_sg_setup(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct scatterlist *sg = qc->__sg;
- struct scatterlist *lsg = &sg[qc->n_elem - 1];
+ struct scatterlist *lsg = sg_last(qc->__sg, qc->n_elem);
int n_elem, pre_n_elem, dir, trim_sg = 0;
VPRINTK("ENTER, ata%u\n", ap->print_id);
@@ -4445,7 +4448,6 @@ void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
- struct scatterlist *sg = qc->__sg;
struct ata_port *ap = qc->ap;
struct page *page;
unsigned int offset;
@@ -4454,8 +4456,8 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
if (qc->curbytes == qc->nbytes - qc->sect_size)
ap->hsm_task_state = HSM_ST_LAST;
- page = sg[qc->cursg].page;
- offset = sg[qc->cursg].offset + qc->cursg_ofs;
+ page = qc->cursg->page;
+ offset = qc->cursg->offset + qc->cursg_ofs;
/* get the current page and offset */
page = nth_page(page, (offset >> PAGE_SHIFT));
@@ -4483,8 +4485,8 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
qc->curbytes += qc->sect_size;
qc->cursg_ofs += qc->sect_size;
- if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
- qc->cursg++;
+ if (qc->cursg_ofs == qc->cursg->length) {
+ qc->cursg = sg_next(qc->cursg);
qc->cursg_ofs = 0;
}
}
@@ -4577,7 +4579,7 @@ static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
ap->hsm_task_state = HSM_ST_LAST;
next_sg:
- if (unlikely(qc->cursg >= qc->n_elem)) {
+ if (unlikely(qc->cursg == sg_last(qc->__sg, qc->n_elem))) {
/*
* The end of qc->sg is reached and the device expects
* more data to transfer. In order not to overrun qc->sg
@@ -4600,7 +4602,7 @@ next_sg:
return;
}
- sg = &qc->__sg[qc->cursg];
+ sg = qc->cursg;
page = sg->page;
offset = sg->offset + qc->cursg_ofs;
@@ -4639,7 +4641,7 @@ next_sg:
qc->cursg_ofs += count;
if (qc->cursg_ofs == sg->length) {
- qc->cursg++;
+ qc->cursg = sg_next(qc->cursg);
qc->cursg_ofs = 0;
}
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 27d9362..e6e216c 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -30,7 +30,7 @@
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
#include <linux/io.h>
#include <linux/ata.h>
#include <linux/workqueue.h>
@@ -380,6 +380,7 @@ struct ata_queued_cmd {
unsigned long flags; /* ATA_QCFLAG_xxx */
unsigned int tag;
unsigned int n_elem;
+ unsigned int n_iter;
unsigned int orig_n_elem;
int dma_dir;
@@ -390,7 +391,7 @@ struct ata_queued_cmd {
unsigned int nbytes;
unsigned int curbytes;
- unsigned int cursg;
+ struct scatterlist *cursg;
unsigned int cursg_ofs;
struct scatterlist sgent;
@@ -925,7 +926,7 @@ ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
return 1;
if (qc->pad_len)
return 0;
- if (((sg - qc->__sg) + 1) == qc->n_elem)
+ if (qc->n_iter == qc->n_elem)
return 1;
return 0;
}
@@ -933,6 +934,7 @@ ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
static inline struct scatterlist *
ata_qc_first_sg(struct ata_queued_cmd *qc)
{
+ qc->n_iter = 0;
if (qc->n_elem)
return qc->__sg;
if (qc->pad_len)
@@ -945,8 +947,8 @@ ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc)
{
if (sg == &qc->pad_sgent)
return NULL;
- if (++sg - qc->__sg < qc->n_elem)
- return sg;
+ if (++qc->n_iter < qc->n_elem)
+ return sg_next(sg);
if (qc->pad_len)
return &qc->pad_sgent;
return NULL;
@@ -1142,9 +1144,11 @@ static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
qc->dma_dir = DMA_NONE;
qc->__sg = NULL;
qc->flags = 0;
- qc->cursg = qc->cursg_ofs = 0;
+ qc->cursg = NULL;
+ qc->cursg_ofs = 0;
qc->nbytes = qc->curbytes = 0;
qc->n_elem = 0;
+ qc->n_iter = 0;
qc->err_mask = 0;
qc->pad_len = 0;
qc->sect_size = ATA_SECT_SIZE;
--
1.5.2.rc1
This converts the SCSI mid layer to using the sg helpers for looking up
sg elements, instead of doing it manually.
Signed-off-by: Jens Axboe <[email protected]>
---
drivers/scsi/scsi_lib.c | 20 +++++++++++---------
1 files changed, 11 insertions(+), 9 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 1f5a07b..f944690 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -302,14 +302,15 @@ static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl,
struct request_queue *q = rq->q;
int nr_pages = (bufflen + sgl[0].offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
unsigned int data_len = 0, len, bytes, off;
+ struct scatterlist *sg;
struct page *page;
struct bio *bio = NULL;
int i, err, nr_vecs = 0;
- for (i = 0; i < nsegs; i++) {
- page = sgl[i].page;
- off = sgl[i].offset;
- len = sgl[i].length;
+ for_each_sg(sgl, sg, nsegs, i) {
+ page = sg->page;
+ off = sg->offset;
+ len = sg->length;
data_len += len;
while (len > 0) {
@@ -2240,18 +2241,19 @@ EXPORT_SYMBOL_GPL(scsi_target_unblock);
*
* Returns virtual address of the start of the mapped page
*/
-void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
+void *scsi_kmap_atomic_sg(struct scatterlist *sgl, int sg_count,
size_t *offset, size_t *len)
{
int i;
size_t sg_len = 0, len_complete = 0;
+ struct scatterlist *sg;
struct page *page;
WARN_ON(!irqs_disabled());
- for (i = 0; i < sg_count; i++) {
+ for_each_sg(sgl, sg, sg_count, i) {
len_complete = sg_len; /* Complete sg-entries */
- sg_len += sg[i].length;
+ sg_len += sg->length;
if (sg_len > *offset)
break;
}
@@ -2265,10 +2267,10 @@ void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
}
/* Offset starting from the beginning of first page in this sg-entry */
- *offset = *offset - len_complete + sg[i].offset;
+ *offset = *offset - len_complete + sg->offset;
/* Assumption: contiguous pages can be accessed as "page + i" */
- page = nth_page(sg[i].page, (*offset >> PAGE_SHIFT));
+ page = nth_page(sg->page, (*offset >> PAGE_SHIFT));
*offset &= ~PAGE_MASK;
/* Bytes in this sg-entry from *offset to the end of the page */
--
1.5.2.rc1
We don't need to do more on x86, there's no iommu to be worried about.
Signed-off-by: Jens Axboe <[email protected]>
---
include/asm-i386/scatterlist.h | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/include/asm-i386/scatterlist.h b/include/asm-i386/scatterlist.h
index d7e45a8..bd5164a 100644
--- a/include/asm-i386/scatterlist.h
+++ b/include/asm-i386/scatterlist.h
@@ -10,6 +10,8 @@ struct scatterlist {
unsigned int length;
};
+#define ARCH_HAS_SG_CHAIN
+
/* These macros should be used after a pci_map_sg call has been done
* to get bus addresses of each of the SG entries and their lengths.
* You should only work with the number of sg entries pci_map_sg
--
1.5.2.rc1
The dma mapping helpers need to be converted to using
sg helpers as well, so they will work with a chained
sglist setup.
Signed-off-by: Jens Axboe <[email protected]>
---
include/asm-i386/dma-mapping.h | 13 +++++++------
1 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/include/asm-i386/dma-mapping.h b/include/asm-i386/dma-mapping.h
index 183eebe..a956ec1 100644
--- a/include/asm-i386/dma-mapping.h
+++ b/include/asm-i386/dma-mapping.h
@@ -2,10 +2,10 @@
#define _ASM_I386_DMA_MAPPING_H
#include <linux/mm.h>
+#include <linux/scatterlist.h>
#include <asm/cache.h>
#include <asm/io.h>
-#include <asm/scatterlist.h>
#include <asm/bug.h>
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
@@ -35,18 +35,19 @@ dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
}
static inline int
-dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
enum dma_data_direction direction)
{
+ struct scatterlist *sg;
int i;
BUG_ON(!valid_dma_direction(direction));
- WARN_ON(nents == 0 || sg[0].length == 0);
+ WARN_ON(nents == 0 || sglist[0].length == 0);
- for (i = 0; i < nents; i++ ) {
- BUG_ON(!sg[i].page);
+ for_each_sg(sglist, sg, nents, i) {
+ BUG_ON(!sg->page);
- sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
+ sg->dma_address = page_to_phys(sg->page) + sg->offset;
}
flush_write_buffers();
--
1.5.2.rc1
Signed-off-by: Jens Axboe <[email protected]>
---
lib/swiotlb.c | 19 ++++++++++++-------
1 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 10c13ad..1f658e4 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -673,16 +673,17 @@ swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
* same here.
*/
int
-swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
+swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
int dir)
{
+ struct scatterlist *sg;
void *addr;
dma_addr_t dev_addr;
int i;
BUG_ON(dir == DMA_NONE);
- for (i = 0; i < nelems; i++, sg++) {
+ for_each_sg(sgl, sg, nelems, i) {
addr = SG_ENT_VIRT_ADDRESS(sg);
dev_addr = virt_to_bus(addr);
if (swiotlb_force || address_needs_mapping(hwdev, dev_addr)) {
@@ -692,7 +693,7 @@ swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
to do proper error handling. */
swiotlb_full(hwdev, sg->length, dir, 0);
swiotlb_unmap_sg(hwdev, sg - i, i, dir);
- sg[0].dma_length = 0;
+ sgl[0].dma_length = 0;
return 0;
}
sg->dma_address = virt_to_bus(map);
@@ -708,19 +709,21 @@ swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
* concerning calls here are the same as for swiotlb_unmap_single() above.
*/
void
-swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
+swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
int dir)
{
+ struct scatterlist *sg;
int i;
BUG_ON(dir == DMA_NONE);
- for (i = 0; i < nelems; i++, sg++)
+ for_each_sg(sgl, sg, nelems, i) {
if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
unmap_single(hwdev, bus_to_virt(sg->dma_address),
sg->dma_length, dir);
else if (dir == DMA_FROM_DEVICE)
dma_mark_clean(SG_ENT_VIRT_ADDRESS(sg), sg->dma_length);
+ }
}
/*
@@ -731,19 +734,21 @@ swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
* and usage.
*/
static void
-swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sg,
+swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
int nelems, int dir, int target)
{
+ struct scatterlist *sg;
int i;
BUG_ON(dir == DMA_NONE);
- for (i = 0; i < nelems; i++, sg++)
+ for_each_sg(sgl, sg, nelems, i) {
if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
sync_single(hwdev, bus_to_virt(sg->dma_address),
sg->dma_length, dir, target);
else if (dir == DMA_FROM_DEVICE)
dma_mark_clean(SG_ENT_VIRT_ADDRESS(sg), sg->dma_length);
+ }
}
void
--
1.5.2.rc1
The core of the patch - allow the last sg element in a scatterlist
table to point to the start of a new table. We overload the LSB of
the page pointer to indicate whether this is a valid sg entry, or
merely a link to the next list.
Signed-off-by: Jens Axboe <[email protected]>
---
include/linux/scatterlist.h | 79 +++++++++++++++++++++++++++++++++++++++++-
1 files changed, 77 insertions(+), 2 deletions(-)
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index bed5ab4..10f6223 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -20,8 +20,36 @@ static inline void sg_init_one(struct scatterlist *sg, const void *buf,
sg_set_buf(sg, buf, buflen);
}
-#define sg_next(sg) ((sg) + 1)
-#define sg_last(sg, nents) (&(sg[(nents) - 1]))
+/*
+ * We overload the LSB of the page pointer to indicate whether it's
+ * a valid sg entry, or whether it points to the start of a new scatterlist.
+ * Those low bits are there for everyone! (thanks mason :-)
+ */
+#define sg_is_chain(sg) ((unsigned long) (sg)->page & 0x01)
+#define sg_chain_ptr(sg) \
+ ((struct scatterlist *) ((unsigned long) (sg)->page & ~0x01))
+
+/**
+ * sg_next - return the next scatterlist entry in a list
+ * @sg: The current sg entry
+ *
+ * Usually the next entry will be @sg@ + 1, but if this sg element is part
+ * of a chained scatterlist, it could jump to the start of a new
+ * scatterlist array.
+ *
+ * Note that the caller must ensure that there are further entries after
+ * the current entry, this function will NOT return NULL for an end-of-list.
+ *
+ */
+static inline struct scatterlist *sg_next(struct scatterlist *sg)
+{
+ sg++;
+
+ if (unlikely(sg_is_chain(sg)))
+ sg = sg_chain_ptr(sg);
+
+ return sg;
+}
/*
* Loop over each sg element, following the pointer to a new list if necessary
@@ -29,4 +57,51 @@ static inline void sg_init_one(struct scatterlist *sg, const void *buf,
#define for_each_sg(sglist, sg, nr, __i) \
for (__i = 0, sg = (sglist); __i < (nr); __i++, sg = sg_next(sg))
+/**
+ * sg_last - return the last scatterlist entry in a list
+ * @sgl: First entry in the scatterlist
+ * @nents: Number of entries in the scatterlist
+ *
+ * Should only be used casually, it (currently) scan the entire list
+ * to get the last entry.
+ *
+ * Note that the @sgl@ pointer passed in need not be the first one,
+ * the important bit is that @nents@ denotes the number of entries that
+ * exist from @sgl@.
+ *
+ */
+static inline struct scatterlist *sg_last(struct scatterlist *sgl,
+ unsigned int nents)
+{
+#ifdef ARCH_HAS_SG_CHAIN
+ struct scatterlist *ret = &sgl[nents - 1];
+#else
+ struct scatterlist *sg, *ret = NULL;
+ int i;
+
+ for_each_sg(sgl, sg, nents, i)
+ ret = sg;
+
+#endif
+ return ret;
+}
+
+/**
+ * sg_chain - Chain two sglists together
+ * @prv: First scatterlist
+ * @prv_nents: Number of entries in prv
+ * @sgl: Second scatterlist
+ *
+ * Links @prv@ and @sgl@ together, to form a longer scatterlist.
+ *
+ */
+static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents,
+ struct scatterlist *sgl)
+{
+#ifndef ARCH_HAS_SG_CHAIN
+ BUG();
+#endif
+ prv[prv_nents - 1].page = (struct page *) ((unsigned long) sgl | 0x01);
+}
+
#endif /* _LINUX_SCATTERLIST_H */
--
1.5.2.rc1
Signed-off-by: Jens Axboe <[email protected]>
---
include/asm-x86_64/dma-mapping.h | 3 +--
include/asm-x86_64/scatterlist.h | 2 ++
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/include/asm-x86_64/dma-mapping.h b/include/asm-x86_64/dma-mapping.h
index 6897e2a..ecd0f61 100644
--- a/include/asm-x86_64/dma-mapping.h
+++ b/include/asm-x86_64/dma-mapping.h
@@ -6,8 +6,7 @@
* documentation.
*/
-
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
#include <asm/io.h>
#include <asm/swiotlb.h>
diff --git a/include/asm-x86_64/scatterlist.h b/include/asm-x86_64/scatterlist.h
index eaf7ada..ef3986b 100644
--- a/include/asm-x86_64/scatterlist.h
+++ b/include/asm-x86_64/scatterlist.h
@@ -11,6 +11,8 @@ struct scatterlist {
unsigned int dma_length;
};
+#define ARCH_HAS_SG_CHAIN
+
#define ISA_DMA_THRESHOLD (0x00ffffff)
/* These macros should be used after a pci_map_sg call has been done
--
1.5.2.rc1
This prepares x86-64 for sg chaining support.
Additional improvements/fixups for pci-gart from
Benny Halevy <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
---
arch/x86_64/kernel/pci-calgary.c | 25 +++++++++-------
arch/x86_64/kernel/pci-gart.c | 60 ++++++++++++++++++++-----------------
arch/x86_64/kernel/pci-nommu.c | 5 ++-
3 files changed, 49 insertions(+), 41 deletions(-)
diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c
index 5bd20b5..c472b14 100644
--- a/arch/x86_64/kernel/pci-calgary.c
+++ b/arch/x86_64/kernel/pci-calgary.c
@@ -35,6 +35,7 @@
#include <linux/pci_ids.h>
#include <linux/pci.h>
#include <linux/delay.h>
+#include <linux/scatterlist.h>
#include <asm/proto.h>
#include <asm/calgary.h>
#include <asm/tce.h>
@@ -341,17 +342,19 @@ static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
static void __calgary_unmap_sg(struct iommu_table *tbl,
struct scatterlist *sglist, int nelems, int direction)
{
- while (nelems--) {
+ struct scatterlist *s;
+ int i;
+
+ for_each_sg(sglist, s, nelems, i) {
unsigned int npages;
- dma_addr_t dma = sglist->dma_address;
- unsigned int dmalen = sglist->dma_length;
+ dma_addr_t dma = s->dma_address;
+ unsigned int dmalen = s->dma_length;
if (dmalen == 0)
break;
npages = num_dma_pages(dma, dmalen);
__iommu_free(tbl, dma, npages);
- sglist++;
}
}
@@ -374,10 +377,10 @@ void calgary_unmap_sg(struct device *dev, struct scatterlist *sglist,
static int calgary_nontranslate_map_sg(struct device* dev,
struct scatterlist *sg, int nelems, int direction)
{
+ struct scatterlist *s;
int i;
- for (i = 0; i < nelems; i++ ) {
- struct scatterlist *s = &sg[i];
+ for_each_sg(sg, s, nelems, i) {
BUG_ON(!s->page);
s->dma_address = virt_to_bus(page_address(s->page) +s->offset);
s->dma_length = s->length;
@@ -389,6 +392,7 @@ int calgary_map_sg(struct device *dev, struct scatterlist *sg,
int nelems, int direction)
{
struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
+ struct scatterlist *s;
unsigned long flags;
unsigned long vaddr;
unsigned int npages;
@@ -400,8 +404,7 @@ int calgary_map_sg(struct device *dev, struct scatterlist *sg,
spin_lock_irqsave(&tbl->it_lock, flags);
- for (i = 0; i < nelems; i++ ) {
- struct scatterlist *s = &sg[i];
+ for_each_sg(sg, s, nelems, i) {
BUG_ON(!s->page);
vaddr = (unsigned long)page_address(s->page) + s->offset;
@@ -428,9 +431,9 @@ int calgary_map_sg(struct device *dev, struct scatterlist *sg,
return nelems;
error:
__calgary_unmap_sg(tbl, sg, nelems, direction);
- for (i = 0; i < nelems; i++) {
- sg[i].dma_address = bad_dma_address;
- sg[i].dma_length = 0;
+ for_each_sg(sg, s, nelems, i) {
+ s->dma_address = bad_dma_address;
+ s->dma_length = 0;
}
spin_unlock_irqrestore(&tbl->it_lock, flags);
return 0;
diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
index ae091cd..2e22a3a 100644
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -23,6 +23,7 @@
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/kdebug.h>
+#include <linux/scatterlist.h>
#include <asm/atomic.h>
#include <asm/io.h>
#include <asm/mtrr.h>
@@ -277,10 +278,10 @@ void gart_unmap_single(struct device *dev, dma_addr_t dma_addr,
*/
void gart_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
{
+ struct scatterlist *s;
int i;
- for (i = 0; i < nents; i++) {
- struct scatterlist *s = &sg[i];
+ for_each_sg(sg, s, nents, i) {
if (!s->dma_length || !s->length)
break;
gart_unmap_single(dev, s->dma_address, s->dma_length, dir);
@@ -291,14 +292,14 @@ void gart_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, int di
static int dma_map_sg_nonforce(struct device *dev, struct scatterlist *sg,
int nents, int dir)
{
+ struct scatterlist *s;
int i;
#ifdef CONFIG_IOMMU_DEBUG
printk(KERN_DEBUG "dma_map_sg overflow\n");
#endif
- for (i = 0; i < nents; i++ ) {
- struct scatterlist *s = &sg[i];
+ for_each_sg(sg, s, nents, i) {
unsigned long addr = page_to_phys(s->page) + s->offset;
if (nonforced_iommu(dev, addr, s->length)) {
addr = dma_map_area(dev, addr, s->length, dir);
@@ -318,23 +319,23 @@ static int dma_map_sg_nonforce(struct device *dev, struct scatterlist *sg,
}
/* Map multiple scatterlist entries continuous into the first. */
-static int __dma_map_cont(struct scatterlist *sg, int start, int stopat,
+static int __dma_map_cont(struct scatterlist *start, int nelems,
struct scatterlist *sout, unsigned long pages)
{
unsigned long iommu_start = alloc_iommu(pages);
unsigned long iommu_page = iommu_start;
+ struct scatterlist *s;
int i;
if (iommu_start == -1)
return -1;
-
- for (i = start; i < stopat; i++) {
- struct scatterlist *s = &sg[i];
+
+ for_each_sg(start, s, nelems, i) {
unsigned long pages, addr;
unsigned long phys_addr = s->dma_address;
- BUG_ON(i > start && s->offset);
- if (i == start) {
+ BUG_ON(s != start && s->offset);
+ if (s == start) {
*sout = *s;
sout->dma_address = iommu_bus_base;
sout->dma_address += iommu_page*PAGE_SIZE + s->offset;
@@ -356,17 +357,17 @@ static int __dma_map_cont(struct scatterlist *sg, int start, int stopat,
return 0;
}
-static inline int dma_map_cont(struct scatterlist *sg, int start, int stopat,
+static inline int dma_map_cont(struct scatterlist *start, int nelems,
struct scatterlist *sout,
unsigned long pages, int need)
{
- if (!need) {
- BUG_ON(stopat - start != 1);
- *sout = sg[start];
- sout->dma_length = sg[start].length;
+ if (!need) {
+ BUG_ON(nelems != 1);
+ *sout = *start;
+ sout->dma_length = start->length;
return 0;
- }
- return __dma_map_cont(sg, start, stopat, sout, pages);
+ }
+ return __dma_map_cont(start, nelems, sout, pages);
}
/*
@@ -380,6 +381,7 @@ int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
int start;
unsigned long pages = 0;
int need = 0, nextneed;
+ struct scatterlist *s, *ps, *start_sg;
if (nents == 0)
return 0;
@@ -389,8 +391,9 @@ int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
out = 0;
start = 0;
- for (i = 0; i < nents; i++) {
- struct scatterlist *s = &sg[i];
+ start_sg = sg;
+ ps = NULL; /* shut up gcc */
+ for_each_sg(sg, s, nents, i) {
dma_addr_t addr = page_to_phys(s->page) + s->offset;
s->dma_address = addr;
BUG_ON(s->length == 0);
@@ -399,29 +402,30 @@ int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
/* Handle the previous not yet processed entries */
if (i > start) {
- struct scatterlist *ps = &sg[i-1];
/* Can only merge when the last chunk ends on a page
boundary and the new one doesn't have an offset. */
if (!iommu_merge || !nextneed || !need || s->offset ||
(ps->offset + ps->length) % PAGE_SIZE) {
- if (dma_map_cont(sg, start, i, sg+out, pages,
- need) < 0)
+ if (dma_map_cont(start_sg, i - start, sg+out,
+ pages, need) < 0)
goto error;
out++;
pages = 0;
- start = i;
+ start = i;
+ start_sg = s;
}
}
need = nextneed;
pages += to_pages(s->offset, s->length);
+ ps = s;
}
- if (dma_map_cont(sg, start, i, sg+out, pages, need) < 0)
+ if (dma_map_cont(start_sg, i - start, sg+out, pages, need) < 0)
goto error;
out++;
flush_gart();
- if (out < nents)
- sg[out].dma_length = 0;
+ if (out < nents)
+ ps->dma_length = 0;
return out;
error:
@@ -436,8 +440,8 @@ error:
if (panic_on_overflow)
panic("dma_map_sg: overflow on %lu pages\n", pages);
iommu_full(dev, pages << PAGE_SHIFT, dir);
- for (i = 0; i < nents; i++)
- sg[i].dma_address = bad_dma_address;
+ for_each_sg(sg, s, nents, i)
+ s->dma_address = bad_dma_address;
return 0;
}
diff --git a/arch/x86_64/kernel/pci-nommu.c b/arch/x86_64/kernel/pci-nommu.c
index 6dade0c..24c9faf 100644
--- a/arch/x86_64/kernel/pci-nommu.c
+++ b/arch/x86_64/kernel/pci-nommu.c
@@ -5,6 +5,7 @@
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
#include <asm/proto.h>
#include <asm/processor.h>
@@ -57,10 +58,10 @@ void nommu_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
int nents, int direction)
{
+ struct scatterlist *s;
int i;
- for (i = 0; i < nents; i++ ) {
- struct scatterlist *s = &sg[i];
+ for_each_sg(sg, s, nents, i) {
BUG_ON(!s->page);
s->dma_address = virt_to_bus(page_address(s->page) +s->offset);
if (!check_addr("map_sg", hwdev, s->dma_address, s->length))
--
1.5.2.rc1
Expose this setting for now, so that users can play with enabling
large commands without defaulting it to on globally. This is a debug
patch, it will be dropped for the final versions.
Signed-off-by: Jens Axboe <[email protected]>
---
block/ll_rw_blk.c | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 7d801cf..b085d0e 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -3980,7 +3980,23 @@ static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
return queue_var_show(max_hw_sectors_kb, (page));
}
+static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
+{
+ return queue_var_show(q->max_phys_segments, page);
+}
+
+static ssize_t queue_max_segments_store(struct request_queue *q,
+ const char *page, size_t count)
+{
+ unsigned long segments;
+ ssize_t ret = queue_var_store(&segments, page, count);
+ spin_lock_irq(q->queue_lock);
+ q->max_phys_segments = segments;
+ spin_unlock_irq(q->queue_lock);
+
+ return ret;
+}
static struct queue_sysfs_entry queue_requests_entry = {
.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
.show = queue_requests_show,
@@ -4004,6 +4020,12 @@ static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
.show = queue_max_hw_sectors_show,
};
+static struct queue_sysfs_entry queue_max_segments_entry = {
+ .attr = {.name = "max_segments", .mode = S_IRUGO | S_IWUSR },
+ .show = queue_max_segments_show,
+ .store = queue_max_segments_store,
+};
+
static struct queue_sysfs_entry queue_iosched_entry = {
.attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
.show = elv_iosched_show,
@@ -4015,6 +4037,7 @@ static struct attribute *default_attrs[] = {
&queue_ra_entry.attr,
&queue_max_hw_sectors_entry.attr,
&queue_max_sectors_entry.attr,
+ &queue_max_segments_entry.attr,
&queue_iosched_entry.attr,
NULL,
};
--
1.5.2.rc1
This updates the ia64 iommu/pci dma mappers to sg chaining.
Signed-off-by: Jens Axboe <[email protected]>
---
arch/ia64/hp/common/sba_iommu.c | 14 +++++++-------
arch/ia64/sn/pci/pci_dma.c | 11 ++++++-----
include/asm-ia64/dma-mapping.h | 1 +
include/asm-ia64/scatterlist.h | 2 ++
4 files changed, 16 insertions(+), 12 deletions(-)
diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index c1dca22..f6d15cf 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -393,7 +393,7 @@ sba_dump_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
printk(KERN_DEBUG " %d : DMA %08lx/%05x CPU %p\n", nents,
startsg->dma_address, startsg->dma_length,
sba_sg_address(startsg));
- startsg++;
+ startsg = sg_next(startsg);
}
}
@@ -406,7 +406,7 @@ sba_check_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
while (the_nents-- > 0) {
if (sba_sg_address(the_sg) == 0x0UL)
sba_dump_sg(NULL, startsg, nents);
- the_sg++;
+ the_sg = sg_next(the_sg);
}
}
@@ -1198,7 +1198,7 @@ sba_fill_pdir(
u32 pide = startsg->dma_address & ~PIDE_FLAG;
dma_offset = (unsigned long) pide & ~iovp_mask;
startsg->dma_address = 0;
- dma_sg++;
+ dma_sg = sg_next(dma_sg);
dma_sg->dma_address = pide | ioc->ibase;
pdirp = &(ioc->pdir_base[pide >> iovp_shift]);
n_mappings++;
@@ -1225,7 +1225,7 @@ sba_fill_pdir(
pdirp++;
} while (cnt > 0);
}
- startsg++;
+ startsg = sg_next(startsg);
}
/* force pdir update */
wmb();
@@ -1294,7 +1294,7 @@ sba_coalesce_chunks( struct ioc *ioc,
while (--nents > 0) {
unsigned long vaddr; /* tmp */
- startsg++;
+ startsg = sg_next(startsg);
/* PARANOID */
startsg->dma_address = startsg->dma_length = 0;
@@ -1404,7 +1404,7 @@ int sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents, int di
#ifdef ALLOW_IOV_BYPASS_SG
ASSERT(to_pci_dev(dev)->dma_mask);
if (likely((ioc->dma_mask & ~to_pci_dev(dev)->dma_mask) == 0)) {
- for (sg = sglist ; filled < nents ; filled++, sg++){
+ for_each_sg(sglist, sg, nents, filled) {
sg->dma_length = sg->length;
sg->dma_address = virt_to_phys(sba_sg_address(sg));
}
@@ -1498,7 +1498,7 @@ void sba_unmap_sg (struct device *dev, struct scatterlist *sglist, int nents, in
while (nents && sglist->dma_length) {
sba_unmap_single(dev, sglist->dma_address, sglist->dma_length, dir);
- sglist++;
+ sglist = sg_next(sglist);
nents--;
}
diff --git a/arch/ia64/sn/pci/pci_dma.c b/arch/ia64/sn/pci/pci_dma.c
index 7a291a2..fde6073 100644
--- a/arch/ia64/sn/pci/pci_dma.c
+++ b/arch/ia64/sn/pci/pci_dma.c
@@ -218,16 +218,17 @@ EXPORT_SYMBOL(sn_dma_unmap_single);
*
* Unmap a set of streaming mode DMA translations.
*/
-void sn_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+void sn_dma_unmap_sg(struct device *dev, struct scatterlist *sgl,
int nhwentries, int direction)
{
int i;
struct pci_dev *pdev = to_pci_dev(dev);
struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
+ struct scatterlist *sg;
BUG_ON(dev->bus != &pci_bus_type);
- for (i = 0; i < nhwentries; i++, sg++) {
+ for_each_sg(sgl, sg, nhwentries, i) {
provider->dma_unmap(pdev, sg->dma_address, direction);
sg->dma_address = (dma_addr_t) NULL;
sg->dma_length = 0;
@@ -244,11 +245,11 @@ EXPORT_SYMBOL(sn_dma_unmap_sg);
*
* Maps each entry of @sg for DMA.
*/
-int sn_dma_map_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
+int sn_dma_map_sg(struct device *dev, struct scatterlist *sgl, int nhwentries,
int direction)
{
unsigned long phys_addr;
- struct scatterlist *saved_sg = sg;
+ struct scatterlist *saved_sg = sgl, *sg;
struct pci_dev *pdev = to_pci_dev(dev);
struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
int i;
@@ -258,7 +259,7 @@ int sn_dma_map_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
/*
* Setup a DMA address for each entry in the scatterlist.
*/
- for (i = 0; i < nhwentries; i++, sg++) {
+ for_each_sg(sgl, sg, nhwentries, i) {
phys_addr = SG_ENT_PHYS_ADDRESS(sg);
sg->dma_address = provider->dma_map(pdev,
phys_addr, sg->length,
diff --git a/include/asm-ia64/dma-mapping.h b/include/asm-ia64/dma-mapping.h
index 6299b51..aeba8da 100644
--- a/include/asm-ia64/dma-mapping.h
+++ b/include/asm-ia64/dma-mapping.h
@@ -5,6 +5,7 @@
* Copyright (C) 2003-2004 Hewlett-Packard Co
* David Mosberger-Tang <[email protected]>
*/
+#include <linux/scatterlist.h>
#include <asm/machvec.h>
#define dma_alloc_coherent platform_dma_alloc_coherent
diff --git a/include/asm-ia64/scatterlist.h b/include/asm-ia64/scatterlist.h
index a452ea2..7d5234d 100644
--- a/include/asm-ia64/scatterlist.h
+++ b/include/asm-ia64/scatterlist.h
@@ -30,4 +30,6 @@ struct scatterlist {
#define sg_dma_len(sg) ((sg)->dma_length)
#define sg_dma_address(sg) ((sg)->dma_address)
+#define ARCH_HAS_SG_CHAIN
+
#endif /* _ASM_IA64_SCATTERLIST_H */
--
1.5.2.rc1
This updates the sparc64 iommu/pci dma mappers to sg chaining.
Signed-off-by: Jens Axboe <[email protected]>
---
arch/sparc64/kernel/pci_iommu.c | 39 +++++++++++++++++++++-----------
arch/sparc64/kernel/pci_sun4v.c | 32 ++++++++++++++++-----------
arch/sparc64/kernel/sbus.c | 44 ++++++++++++++++++++++--------------
include/asm-sparc64/scatterlist.h | 2 +
4 files changed, 73 insertions(+), 44 deletions(-)
diff --git a/arch/sparc64/kernel/pci_iommu.c b/arch/sparc64/kernel/pci_iommu.c
index 70d2364..2118a4d 100644
--- a/arch/sparc64/kernel/pci_iommu.c
+++ b/arch/sparc64/kernel/pci_iommu.c
@@ -9,6 +9,7 @@
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/pci.h>
+#include <linux/scatterlist.h>
#include <asm/oplib.h>
@@ -470,7 +471,7 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
int nused, int nelems, unsigned long iopte_protection)
{
struct scatterlist *dma_sg = sg;
- struct scatterlist *sg_end = sg + nelems;
+ struct scatterlist *sg_end = sg_last(sg, nelems);
int i;
for (i = 0; i < nused; i++) {
@@ -505,7 +506,7 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
len -= (IO_PAGE_SIZE - (tmp & (IO_PAGE_SIZE - 1UL)));
break;
}
- sg++;
+ sg = sg_next(sg);
}
pteval = iopte_protection | (pteval & IOPTE_PAGE);
@@ -518,7 +519,7 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
}
pteval = (pteval & IOPTE_PAGE) + len;
- sg++;
+ sg = sg_next(sg);
/* Skip over any tail mappings we've fully mapped,
* adjusting pteval along the way. Stop when we
@@ -530,12 +531,12 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
((pteval ^
(SG_ENT_PHYS_ADDRESS(sg) + sg->length - 1UL)) >> IO_PAGE_SHIFT) == 0UL) {
pteval += sg->length;
- sg++;
+ sg = sg_next(sg);
}
if ((pteval << (64 - IO_PAGE_SHIFT)) == 0UL)
pteval = ~0UL;
} while (dma_npages != 0);
- dma_sg++;
+ dma_sg = sg_next(dma_sg);
}
}
@@ -599,7 +600,7 @@ static int pci_4u_map_sg(struct pci_dev *pdev, struct scatterlist *sglist, int n
sgtmp = sglist;
while (used && sgtmp->dma_length) {
sgtmp->dma_address += dma_base;
- sgtmp++;
+ sgtmp = sg_next(sgtmp);
used--;
}
used = nelems - used;
@@ -635,6 +636,7 @@ static void pci_4u_unmap_sg(struct pci_dev *pdev, struct scatterlist *sglist, in
struct strbuf *strbuf;
iopte_t *base;
unsigned long flags, ctx, i, npages;
+ struct scatterlist *sg, *sgprv;
u32 bus_addr;
if (unlikely(direction == PCI_DMA_NONE)) {
@@ -647,11 +649,15 @@ static void pci_4u_unmap_sg(struct pci_dev *pdev, struct scatterlist *sglist, in
bus_addr = sglist->dma_address & IO_PAGE_MASK;
- for (i = 1; i < nelems; i++)
- if (sglist[i].dma_length == 0)
+ sgprv = NULL;
+ for_each_sg(sglist, sg, nelems, i) {
+ if (sg->dma_length == 0)
break;
- i--;
- npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length) -
+
+ sgprv = sg;
+ }
+
+ npages = (IO_PAGE_ALIGN(sgprv->dma_address + sgprv->dma_length) -
bus_addr) >> IO_PAGE_SHIFT;
base = iommu->page_table +
@@ -730,6 +736,7 @@ static void pci_4u_dma_sync_sg_for_cpu(struct pci_dev *pdev, struct scatterlist
struct iommu *iommu;
struct strbuf *strbuf;
unsigned long flags, ctx, npages, i;
+ struct scatterlist *sg, *sgprv;
u32 bus_addr;
iommu = pdev->dev.archdata.iommu;
@@ -753,11 +760,15 @@ static void pci_4u_dma_sync_sg_for_cpu(struct pci_dev *pdev, struct scatterlist
/* Step 2: Kick data out of streaming buffers. */
bus_addr = sglist[0].dma_address & IO_PAGE_MASK;
- for(i = 1; i < nelems; i++)
- if (!sglist[i].dma_length)
+ sgprv = NULL;
+ for_each_sg(sglist, sg, nelems, i) {
+ if (sg->dma_length == 0)
break;
- i--;
- npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length)
+
+ sgprv = sg;
+ }
+
+ npages = (IO_PAGE_ALIGN(sgprv->dma_address + sgprv->dma_length)
- bus_addr) >> IO_PAGE_SHIFT;
pci_strbuf_flush(strbuf, iommu, bus_addr, ctx, npages, direction);
diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index 044e8ec..c385704 100644
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -12,6 +12,7 @@
#include <linux/percpu.h>
#include <linux/irq.h>
#include <linux/msi.h>
+#include <linux/scatterlist.h>
#include <asm/iommu.h>
#include <asm/irq.h>
@@ -364,7 +365,7 @@ static inline long fill_sg(long entry, struct pci_dev *pdev,
int nused, int nelems, unsigned long prot)
{
struct scatterlist *dma_sg = sg;
- struct scatterlist *sg_end = sg + nelems;
+ struct scatterlist *sg_end = sg_last(sg, nelems);
unsigned long flags;
int i;
@@ -404,7 +405,7 @@ static inline long fill_sg(long entry, struct pci_dev *pdev,
len -= (IO_PAGE_SIZE - (tmp & (IO_PAGE_SIZE - 1UL)));
break;
}
- sg++;
+ sg = sg_next(sg);
}
pteval = (pteval & IOPTE_PAGE);
@@ -422,24 +423,25 @@ static inline long fill_sg(long entry, struct pci_dev *pdev,
}
pteval = (pteval & IOPTE_PAGE) + len;
- sg++;
+ sg = sg_next(sg);
/* Skip over any tail mappings we've fully mapped,
* adjusting pteval along the way. Stop when we
* detect a page crossing event.
*/
- while (sg < sg_end &&
- (pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
+ while ((pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
(pteval == SG_ENT_PHYS_ADDRESS(sg)) &&
((pteval ^
(SG_ENT_PHYS_ADDRESS(sg) + sg->length - 1UL)) >> IO_PAGE_SHIFT) == 0UL) {
pteval += sg->length;
- sg++;
+ if (sg == sg_end)
+ break;
+ sg = sg_next(sg);
}
if ((pteval << (64 - IO_PAGE_SHIFT)) == 0UL)
pteval = ~0UL;
} while (dma_npages != 0);
- dma_sg++;
+ dma_sg = sg_next(dma_sg);
}
if (unlikely(pci_iommu_batch_end() < 0L))
@@ -499,7 +501,7 @@ static int pci_4v_map_sg(struct pci_dev *pdev, struct scatterlist *sglist, int n
sgtmp = sglist;
while (used && sgtmp->dma_length) {
sgtmp->dma_address += dma_base;
- sgtmp++;
+ sgtmp = sg_next(sgtmp);
used--;
}
used = nelems - used;
@@ -533,6 +535,7 @@ static void pci_4v_unmap_sg(struct pci_dev *pdev, struct scatterlist *sglist, in
struct pci_pbm_info *pbm;
struct iommu *iommu;
unsigned long flags, i, npages;
+ struct scatterlist *sg, *sgprv;
long entry;
u32 devhandle, bus_addr;
@@ -546,12 +549,15 @@ static void pci_4v_unmap_sg(struct pci_dev *pdev, struct scatterlist *sglist, in
devhandle = pbm->devhandle;
bus_addr = sglist->dma_address & IO_PAGE_MASK;
-
- for (i = 1; i < nelems; i++)
- if (sglist[i].dma_length == 0)
+ sgprv = NULL;
+ for_each_sg(sglist, sg, nelems, i) {
+ if (sg->dma_length == 0)
break;
- i--;
- npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length) -
+
+ sgprv = sg;
+ }
+
+ npages = (IO_PAGE_ALIGN(sgprv->dma_address + sgprv->dma_length) -
bus_addr) >> IO_PAGE_SHIFT;
entry = ((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
diff --git a/arch/sparc64/kernel/sbus.c b/arch/sparc64/kernel/sbus.c
index 91f6e2a..125c0d7 100644
--- a/arch/sparc64/kernel/sbus.c
+++ b/arch/sparc64/kernel/sbus.c
@@ -11,6 +11,7 @@
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/interrupt.h>
+#include <linux/scatterlist.h>
#include <asm/page.h>
#include <asm/sbus.h>
@@ -348,7 +349,7 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
int nused, int nelems, unsigned long iopte_protection)
{
struct scatterlist *dma_sg = sg;
- struct scatterlist *sg_end = sg + nelems;
+ struct scatterlist *sg_end = sg_last(sg, nelems);
int i;
for (i = 0; i < nused; i++) {
@@ -383,7 +384,7 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
len -= (IO_PAGE_SIZE - (tmp & (IO_PAGE_SIZE - 1UL)));
break;
}
- sg++;
+ sg = sg_next(sg);
}
pteval = iopte_protection | (pteval & IOPTE_PAGE);
@@ -396,24 +397,25 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
}
pteval = (pteval & IOPTE_PAGE) + len;
- sg++;
+ sg = sg_next(sg);
/* Skip over any tail mappings we've fully mapped,
* adjusting pteval along the way. Stop when we
* detect a page crossing event.
*/
- while (sg < sg_end &&
- (pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
+ while ((pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
(pteval == SG_ENT_PHYS_ADDRESS(sg)) &&
((pteval ^
(SG_ENT_PHYS_ADDRESS(sg) + sg->length - 1UL)) >> IO_PAGE_SHIFT) == 0UL) {
pteval += sg->length;
- sg++;
+ if (sg == sg_end)
+ break;
+ sg = sg_next(sg);
}
if ((pteval << (64 - IO_PAGE_SHIFT)) == 0UL)
pteval = ~0UL;
} while (dma_npages != 0);
- dma_sg++;
+ dma_sg = sg_next(dma_sg);
}
}
@@ -461,7 +463,7 @@ int sbus_map_sg(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems, i
sgtmp = sglist;
while (used && sgtmp->dma_length) {
sgtmp->dma_address += dma_base;
- sgtmp++;
+ sgtmp = sg_next(sgtmp);
used--;
}
used = nelems - used;
@@ -486,6 +488,7 @@ void sbus_unmap_sg(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems
struct strbuf *strbuf;
iopte_t *base;
unsigned long flags, i, npages;
+ struct scatterlist *sg, *sgprv;
u32 bus_addr;
if (unlikely(direction == SBUS_DMA_NONE))
@@ -496,12 +499,15 @@ void sbus_unmap_sg(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems
strbuf = &info->strbuf;
bus_addr = sglist->dma_address & IO_PAGE_MASK;
-
- for (i = 1; i < nelems; i++)
- if (sglist[i].dma_length == 0)
+ sgprv = NULL;
+ for_each_sg(sglist, sg, nelems, i) {
+ if (sg->dma_length == 0)
break;
- i--;
- npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length) -
+
+ sgprv = sg;
+ }
+
+ npages = (IO_PAGE_ALIGN(sgprv->dma_address + sgprv->dma_length) -
bus_addr) >> IO_PAGE_SHIFT;
base = iommu->page_table +
@@ -545,6 +551,7 @@ void sbus_dma_sync_sg_for_cpu(struct sbus_dev *sdev, struct scatterlist *sglist,
struct iommu *iommu;
struct strbuf *strbuf;
unsigned long flags, npages, i;
+ struct scatterlist *sg, *sgprv;
u32 bus_addr;
info = sdev->bus->iommu;
@@ -552,12 +559,15 @@ void sbus_dma_sync_sg_for_cpu(struct sbus_dev *sdev, struct scatterlist *sglist,
strbuf = &info->strbuf;
bus_addr = sglist[0].dma_address & IO_PAGE_MASK;
- for (i = 0; i < nelems; i++) {
- if (!sglist[i].dma_length)
+ sgprv = NULL;
+ for_each_sg(sglist, sg, nelems, i) {
+ if (sg->dma_length == 0)
break;
+
+ sgprv = sg;
}
- i--;
- npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length)
+
+ npages = (IO_PAGE_ALIGN(sgprv->dma_address + sgprv->dma_length)
- bus_addr) >> IO_PAGE_SHIFT;
spin_lock_irqsave(&iommu->lock, flags);
diff --git a/include/asm-sparc64/scatterlist.h b/include/asm-sparc64/scatterlist.h
index 048fdb4..703c5bb 100644
--- a/include/asm-sparc64/scatterlist.h
+++ b/include/asm-sparc64/scatterlist.h
@@ -20,4 +20,6 @@ struct scatterlist {
#define ISA_DMA_THRESHOLD (~0UL)
+#define ARCH_HAS_SG_CHAIN
+
#endif /* !(_SPARC64_SCATTERLIST_H) */
--
1.5.2.rc1
Just pass in the command, no point in passing in the scatterlist
and scatterlist pool index seperately.
Signed-off-by: Jens Axboe <[email protected]>
---
drivers/scsi/scsi_lib.c | 9 +++++----
drivers/scsi/scsi_tgt_lib.c | 4 ++--
include/scsi/scsi_cmnd.h | 2 +-
3 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index f944690..26236b1 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -745,13 +745,14 @@ struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask)
EXPORT_SYMBOL(scsi_alloc_sgtable);
-void scsi_free_sgtable(struct scatterlist *sgl, int index)
+void scsi_free_sgtable(struct scsi_cmnd *cmd)
{
+ struct scatterlist *sgl = cmd->request_buffer;
struct scsi_host_sg_pool *sgp;
- BUG_ON(index >= SG_MEMPOOL_NR);
+ BUG_ON(cmd->sglist_len >= SG_MEMPOOL_NR);
- sgp = scsi_sg_pools + index;
+ sgp = scsi_sg_pools + cmd->sglist_len;
mempool_free(sgl, sgp->pool);
}
@@ -777,7 +778,7 @@ EXPORT_SYMBOL(scsi_free_sgtable);
static void scsi_release_buffers(struct scsi_cmnd *cmd)
{
if (cmd->use_sg)
- scsi_free_sgtable(cmd->request_buffer, cmd->sglist_len);
+ scsi_free_sgtable(cmd);
/*
* Zero these out. They now point to freed memory, and it is
diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c
index 2570f48..d6e58e5 100644
--- a/drivers/scsi/scsi_tgt_lib.c
+++ b/drivers/scsi/scsi_tgt_lib.c
@@ -329,7 +329,7 @@ static void scsi_tgt_cmd_done(struct scsi_cmnd *cmd)
scsi_tgt_uspace_send_status(cmd, tcmd->tag);
if (cmd->request_buffer)
- scsi_free_sgtable(cmd->request_buffer, cmd->sglist_len);
+ scsi_free_sgtable(cmd);
queue_work(scsi_tgtd, &tcmd->work);
}
@@ -370,7 +370,7 @@ static int scsi_tgt_init_cmd(struct scsi_cmnd *cmd, gfp_t gfp_mask)
}
eprintk("cmd %p cnt %d\n", cmd, cmd->use_sg);
- scsi_free_sgtable(cmd->request_buffer, cmd->sglist_len);
+ scsi_free_sgtable(cmd);
return -EINVAL;
}
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index a2e0c10..d7db992 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -133,6 +133,6 @@ extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
extern void scsi_kunmap_atomic_sg(void *virt);
extern struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *, gfp_t);
-extern void scsi_free_sgtable(struct scatterlist *, int);
+extern void scsi_free_sgtable(struct scsi_cmnd *);
#endif /* _SCSI_SCSI_CMND_H */
--
1.5.2.rc1
This updates the sparc iommu/pci dma mappers to sg chaining.
Signed-off-by: Jens Axboe <[email protected]>
---
arch/sparc/kernel/ioport.c | 25 +++++++++++++------------
arch/sparc/mm/io-unit.c | 12 +++++++-----
arch/sparc/mm/iommu.c | 10 +++++-----
arch/sparc/mm/sun4c.c | 10 ++++++----
include/asm-sparc/scatterlist.h | 2 ++
5 files changed, 33 insertions(+), 26 deletions(-)
diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
index 62182d2..9c3ed88 100644
--- a/arch/sparc/kernel/ioport.c
+++ b/arch/sparc/kernel/ioport.c
@@ -35,6 +35,7 @@
#include <linux/slab.h>
#include <linux/pci.h> /* struct pci_dev */
#include <linux/proc_fs.h>
+#include <linux/scatterlist.h>
#include <asm/io.h>
#include <asm/vaddrs.h>
@@ -717,19 +718,19 @@ void pci_unmap_page(struct pci_dev *hwdev,
* Device ownership issues as mentioned above for pci_map_single are
* the same here.
*/
-int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents,
+int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents,
int direction)
{
+ struct scatterlist *sg;
int n;
BUG_ON(direction == PCI_DMA_NONE);
/* IIep is write-through, not flushing. */
- for (n = 0; n < nents; n++) {
+ for_each_sg(sgl, sg, nents, n) {
BUG_ON(page_address(sg->page) == NULL);
sg->dvma_address =
virt_to_phys(page_address(sg->page)) + sg->offset;
sg->dvma_length = sg->length;
- sg++;
}
return nents;
}
@@ -738,19 +739,19 @@ int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents,
* Again, cpu read rules concerning calls here are the same as for
* pci_unmap_single() above.
*/
-void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents,
+void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents,
int direction)
{
+ struct scatterlist *sg;
int n;
BUG_ON(direction == PCI_DMA_NONE);
if (direction != PCI_DMA_TODEVICE) {
- for (n = 0; n < nents; n++) {
+ for_each_sg(sgl, sg, nents, n) {
BUG_ON(page_address(sg->page) == NULL);
mmu_inval_dma_area(
(unsigned long) page_address(sg->page),
(sg->length + PAGE_SIZE-1) & PAGE_MASK);
- sg++;
}
}
}
@@ -789,34 +790,34 @@ void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t ba, size_t
* The same as pci_dma_sync_single_* but for a scatter-gather list,
* same rules and usage.
*/
-void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
+void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)
{
+ struct scatterlist *sg;
int n;
BUG_ON(direction == PCI_DMA_NONE);
if (direction != PCI_DMA_TODEVICE) {
- for (n = 0; n < nents; n++) {
+ for_each_sg(sgl, sg, nents, n) {
BUG_ON(page_address(sg->page) == NULL);
mmu_inval_dma_area(
(unsigned long) page_address(sg->page),
(sg->length + PAGE_SIZE-1) & PAGE_MASK);
- sg++;
}
}
}
-void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
+void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)
{
+ struct scatterlist *sg;
int n;
BUG_ON(direction == PCI_DMA_NONE);
if (direction != PCI_DMA_TODEVICE) {
- for (n = 0; n < nents; n++) {
+ for_each_sg(sgl, sg, nents, n) {
BUG_ON(page_address(sg->page) == NULL);
mmu_inval_dma_area(
(unsigned long) page_address(sg->page),
(sg->length + PAGE_SIZE-1) & PAGE_MASK);
- sg++;
}
}
}
diff --git a/arch/sparc/mm/io-unit.c b/arch/sparc/mm/io-unit.c
index 4ccda77..71442fe 100644
--- a/arch/sparc/mm/io-unit.c
+++ b/arch/sparc/mm/io-unit.c
@@ -11,8 +11,8 @@
#include <linux/mm.h>
#include <linux/highmem.h> /* pte_offset_map => kmap_atomic */
#include <linux/bitops.h>
+#include <linux/scatterlist.h>
-#include <asm/scatterlist.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/sbus.h>
@@ -144,8 +144,9 @@ static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus
spin_lock_irqsave(&iounit->lock, flags);
while (sz != 0) {
--sz;
- sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
- sg[sz].dvma_length = sg[sz].length;
+ sg->dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg->page) + sg->offset, sg->length);
+ sg->dvma_length = sg->length;
+ sg = sg_next(sg);
}
spin_unlock_irqrestore(&iounit->lock, flags);
}
@@ -173,11 +174,12 @@ static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_
spin_lock_irqsave(&iounit->lock, flags);
while (sz != 0) {
--sz;
- len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
- vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
+ len = ((sg->dvma_address & ~PAGE_MASK) + sg->length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
+ vaddr = (sg->dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
for (len += vaddr; vaddr < len; vaddr++)
clear_bit(vaddr, iounit->bmap);
+ sg = sg_next(sg);
}
spin_unlock_irqrestore(&iounit->lock, flags);
}
diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c
index be042ef..0534cd0 100644
--- a/arch/sparc/mm/iommu.c
+++ b/arch/sparc/mm/iommu.c
@@ -12,8 +12,8 @@
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/highmem.h> /* pte_offset_map => kmap_atomic */
+#include <linux/scatterlist.h>
-#include <asm/scatterlist.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/sbus.h>
@@ -240,7 +240,7 @@ static void iommu_get_scsi_sgl_noflush(struct scatterlist *sg, int sz, struct sb
n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
sg->dvma_address = iommu_get_one(sg->page, n, sbus) + sg->offset;
sg->dvma_length = (__u32) sg->length;
- sg++;
+ sg = sg_next(sg);
}
}
@@ -254,7 +254,7 @@ static void iommu_get_scsi_sgl_gflush(struct scatterlist *sg, int sz, struct sbu
n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
sg->dvma_address = iommu_get_one(sg->page, n, sbus) + sg->offset;
sg->dvma_length = (__u32) sg->length;
- sg++;
+ sg = sg_next(sg);
}
}
@@ -285,7 +285,7 @@ static void iommu_get_scsi_sgl_pflush(struct scatterlist *sg, int sz, struct sbu
sg->dvma_address = iommu_get_one(sg->page, n, sbus) + sg->offset;
sg->dvma_length = (__u32) sg->length;
- sg++;
+ sg = sg_next(sg);
}
}
@@ -325,7 +325,7 @@ static void iommu_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_b
n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
iommu_release_one(sg->dvma_address & PAGE_MASK, n, sbus);
sg->dvma_address = 0x21212121;
- sg++;
+ sg = sg_next(sg);
}
}
diff --git a/arch/sparc/mm/sun4c.c b/arch/sparc/mm/sun4c.c
index 436021c..e5c703b 100644
--- a/arch/sparc/mm/sun4c.c
+++ b/arch/sparc/mm/sun4c.c
@@ -17,8 +17,8 @@
#include <linux/highmem.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
+#include <linux/scatterlist.h>
-#include <asm/scatterlist.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
@@ -1229,8 +1229,9 @@ static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *
{
while (sz != 0) {
--sz;
- sg[sz].dvma_address = (__u32)sun4c_lockarea(page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
- sg[sz].dvma_length = sg[sz].length;
+ sg->dvma_address = (__u32)sun4c_lockarea(page_address(sg->page) + sg->offset, sg->length);
+ sg->dvma_length = sg->length;
+ sg = sg_next(sg);
}
}
@@ -1245,7 +1246,8 @@ static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_b
{
while (sz != 0) {
--sz;
- sun4c_unlockarea((char *)sg[sz].dvma_address, sg[sz].length);
+ sun4c_unlockarea((char *)sg->dvma_address, sg->length);
+ sg = sg_next(sg);
}
}
diff --git a/include/asm-sparc/scatterlist.h b/include/asm-sparc/scatterlist.h
index a4fcf9a..4055af9 100644
--- a/include/asm-sparc/scatterlist.h
+++ b/include/asm-sparc/scatterlist.h
@@ -19,4 +19,6 @@ struct scatterlist {
#define ISA_DMA_THRESHOLD (~0UL)
+#define ARCH_HAS_SG_CHAIN
+
#endif /* !(_SPARC_SCATTERLIST_H) */
--
1.5.2.rc1
This updates the ppc iommu/pci dma mappers to sg chaining.
Signed-off-by: Jens Axboe <[email protected]>
---
arch/powerpc/kernel/dma_64.c | 5 +++--
arch/powerpc/kernel/ibmebus.c | 11 ++++++-----
arch/powerpc/kernel/iommu.c | 18 +++++++++++-------
arch/powerpc/platforms/ps3/system-bus.c | 5 +++--
include/asm-powerpc/dma-mapping.h | 2 +-
include/asm-powerpc/scatterlist.h | 2 ++
6 files changed, 26 insertions(+), 17 deletions(-)
diff --git a/arch/powerpc/kernel/dma_64.c b/arch/powerpc/kernel/dma_64.c
index 7b0e754..9001104 100644
--- a/arch/powerpc/kernel/dma_64.c
+++ b/arch/powerpc/kernel/dma_64.c
@@ -154,12 +154,13 @@ static void dma_direct_unmap_single(struct device *dev, dma_addr_t dma_addr,
{
}
-static int dma_direct_map_sg(struct device *dev, struct scatterlist *sg,
+static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
int nents, enum dma_data_direction direction)
{
+ struct scatterlist *sg;
int i;
- for (i = 0; i < nents; i++, sg++) {
+ for_each_sg(sgl, sg, nents, i) {
sg->dma_address = (page_to_phys(sg->page) + sg->offset) |
dma_direct_offset;
sg->dma_length = sg->length;
diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c
index 9a8c9af..3131c61 100644
--- a/arch/powerpc/kernel/ibmebus.c
+++ b/arch/powerpc/kernel/ibmebus.c
@@ -87,15 +87,16 @@ static void ibmebus_unmap_single(struct device *dev,
}
static int ibmebus_map_sg(struct device *dev,
- struct scatterlist *sg,
+ struct scatterlist *sgl,
int nents, enum dma_data_direction direction)
{
+ struct scatterlist *sg;
int i;
- for (i = 0; i < nents; i++) {
- sg[i].dma_address = (dma_addr_t)page_address(sg[i].page)
- + sg[i].offset;
- sg[i].dma_length = sg[i].length;
+ for_each_sg(sgl, sg, nents, i) {
+ sg->dma_address = (dma_addr_t)page_address(sg->page)
+ + sg->offset;
+ sg->dma_length = sg->length;
}
return nents;
diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index c08ceca..a146856 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -278,7 +278,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
dma_addr_t dma_next = 0, dma_addr;
unsigned long flags;
struct scatterlist *s, *outs, *segstart;
- int outcount, incount;
+ int outcount, incount, i;
unsigned long handle;
BUG_ON(direction == DMA_NONE);
@@ -298,7 +298,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
spin_lock_irqsave(&(tbl->it_lock), flags);
- for (s = outs; nelems; nelems--, s++) {
+ for_each_sg(sglist, s, nelems, i) {
unsigned long vaddr, npages, entry, slen;
slen = s->length;
@@ -386,7 +386,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
return outcount;
failure:
- for (s = &sglist[0]; s <= outs; s++) {
+ for_each_sg(sglist, s, nelems, i) {
if (s->dma_length != 0) {
unsigned long vaddr, npages;
@@ -396,6 +396,8 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
s->dma_address = DMA_ERROR_CODE;
s->dma_length = 0;
}
+ if (s == outs)
+ break;
}
spin_unlock_irqrestore(&(tbl->it_lock), flags);
return 0;
@@ -405,6 +407,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
int nelems, enum dma_data_direction direction)
{
+ struct scatterlist *sg;
unsigned long flags;
BUG_ON(direction == DMA_NONE);
@@ -414,15 +417,16 @@ void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
spin_lock_irqsave(&(tbl->it_lock), flags);
+ sg = sglist;
while (nelems--) {
unsigned int npages;
- dma_addr_t dma_handle = sglist->dma_address;
+ dma_addr_t dma_handle = sg->dma_address;
- if (sglist->dma_length == 0)
+ if (sg->dma_length == 0)
break;
- npages = iommu_num_pages(dma_handle,sglist->dma_length);
+ npages = iommu_num_pages(dma_handle, sg->dma_length);
__iommu_free(tbl, dma_handle, npages);
- sglist++;
+ sg = sg_next(sg);
}
/* Flush/invalidate TLBs if necessary. As for iommu_free(), we
diff --git a/arch/powerpc/platforms/ps3/system-bus.c b/arch/powerpc/platforms/ps3/system-bus.c
index 6bda510..22aedb6 100644
--- a/arch/powerpc/platforms/ps3/system-bus.c
+++ b/arch/powerpc/platforms/ps3/system-bus.c
@@ -271,7 +271,7 @@ static void ps3_unmap_single(struct device *_dev, dma_addr_t dma_addr,
}
}
-static int ps3_map_sg(struct device *_dev, struct scatterlist *sg, int nents,
+static int ps3_map_sg(struct device *_dev, struct scatterlist *sgl, int nents,
enum dma_data_direction direction)
{
#if defined(CONFIG_PS3_DYNAMIC_DMA)
@@ -279,9 +279,10 @@ static int ps3_map_sg(struct device *_dev, struct scatterlist *sg, int nents,
return -EPERM;
#else
struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
+ struct scatterlist *sg;
int i;
- for (i = 0; i < nents; i++, sg++) {
+ for_each_sg(sgl, sg, nents, i) {
int result = ps3_dma_map(dev->d_region,
page_to_phys(sg->page) + sg->offset, sg->length,
&sg->dma_address);
diff --git a/include/asm-powerpc/dma-mapping.h b/include/asm-powerpc/dma-mapping.h
index a19a6f1..9f97fd3 100644
--- a/include/asm-powerpc/dma-mapping.h
+++ b/include/asm-powerpc/dma-mapping.h
@@ -12,7 +12,7 @@
#include <linux/cache.h>
/* need struct page definitions */
#include <linux/mm.h>
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
#include <asm/io.h>
#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
diff --git a/include/asm-powerpc/scatterlist.h b/include/asm-powerpc/scatterlist.h
index 8c992d1..b075f61 100644
--- a/include/asm-powerpc/scatterlist.h
+++ b/include/asm-powerpc/scatterlist.h
@@ -41,5 +41,7 @@ struct scatterlist {
#define ISA_DMA_THRESHOLD (~0UL)
#endif
+#define ARCH_HAS_SG_CHAIN
+
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_SCATTERLIST_H */
--
1.5.2.rc1
This is what enables large commands. If we need to allocate an
sgtable that doesn't fit in a single page, allocate several
SCSI_MAX_SG_SEGMENTS sized tables and chain them together.
SCSI defaults to large chained sg tables, if the arch supports it.
Signed-off-by: Jens Axboe <[email protected]>
---
drivers/scsi/scsi_lib.c | 210 +++++++++++++++++++++++++++++++++++----------
include/scsi/scsi.h | 7 --
include/scsi/scsi_cmnd.h | 1 +
3 files changed, 164 insertions(+), 54 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 26236b1..9aa1100 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -29,39 +29,26 @@
#include "scsi_priv.h"
#include "scsi_logging.h"
+#include <linux/scatterlist.h>
#define SG_MEMPOOL_NR ARRAY_SIZE(scsi_sg_pools)
#define SG_MEMPOOL_SIZE 2
struct scsi_host_sg_pool {
size_t size;
- char *name;
+ char *name;
struct kmem_cache *slab;
mempool_t *pool;
};
-#if (SCSI_MAX_PHYS_SEGMENTS < 32)
-#error SCSI_MAX_PHYS_SEGMENTS is too small
-#endif
-
-#define SP(x) { x, "sgpool-" #x }
+#define SP(x) { x, "sgpool-" #x }
static struct scsi_host_sg_pool scsi_sg_pools[] = {
SP(8),
SP(16),
SP(32),
-#if (SCSI_MAX_PHYS_SEGMENTS > 32)
SP(64),
-#if (SCSI_MAX_PHYS_SEGMENTS > 64)
SP(128),
-#if (SCSI_MAX_PHYS_SEGMENTS > 128)
- SP(256),
-#if (SCSI_MAX_PHYS_SEGMENTS > 256)
-#error SCSI_MAX_PHYS_SEGMENTS is too large
-#endif
-#endif
-#endif
-#endif
-};
+};
#undef SP
static void scsi_run_queue(struct request_queue *q);
@@ -702,45 +689,126 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int uptodate,
return NULL;
}
-struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask)
-{
- struct scsi_host_sg_pool *sgp;
- struct scatterlist *sgl;
+/*
+ * The maximum number of SG segments that we will put inside a scatterlist
+ * (unless chaining is used). Should ideally fit inside a single page, to
+ * avoid a higher order allocation.
+ */
+#define SCSI_MAX_SG_SEGMENTS 128
- BUG_ON(!cmd->use_sg);
+/*
+ * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
+ * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
+ */
+#define SCSI_MAX_SG_CHAIN_SEGMENTS 2048
- switch (cmd->use_sg) {
+static inline unsigned int scsi_sgtable_index(unsigned short nents)
+{
+ unsigned int index;
+
+ switch (nents) {
case 1 ... 8:
- cmd->sglist_len = 0;
+ index = 0;
break;
case 9 ... 16:
- cmd->sglist_len = 1;
+ index = 1;
break;
case 17 ... 32:
- cmd->sglist_len = 2;
+ index = 2;
break;
-#if (SCSI_MAX_PHYS_SEGMENTS > 32)
case 33 ... 64:
- cmd->sglist_len = 3;
- break;
-#if (SCSI_MAX_PHYS_SEGMENTS > 64)
- case 65 ... 128:
- cmd->sglist_len = 4;
+ index = 3;
break;
-#if (SCSI_MAX_PHYS_SEGMENTS > 128)
- case 129 ... 256:
- cmd->sglist_len = 5;
+ case 65 ... SCSI_MAX_SG_SEGMENTS:
+ index = 4;
break;
-#endif
-#endif
-#endif
default:
- return NULL;
+ printk(KERN_ERR "scsi: bad segment count=%d\n", nents);
+ BUG();
}
- sgp = scsi_sg_pools + cmd->sglist_len;
- sgl = mempool_alloc(sgp->pool, gfp_mask);
- return sgl;
+ return index;
+}
+
+struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask)
+{
+ struct scsi_host_sg_pool *sgp;
+ struct scatterlist *sgl, *prev, *ret;
+ unsigned int index;
+ int this, left;
+
+ BUG_ON(!cmd->use_sg);
+
+ left = cmd->use_sg;
+ ret = prev = NULL;
+ do {
+ this = left;
+ if (this > SCSI_MAX_SG_SEGMENTS) {
+ this = SCSI_MAX_SG_SEGMENTS - 1;
+ index = SG_MEMPOOL_NR - 1;
+ } else
+ index = scsi_sgtable_index(this);
+
+ left -= this;
+
+ sgp = scsi_sg_pools + index;
+
+ sgl = mempool_alloc(sgp->pool, gfp_mask);
+ if (unlikely(!sgl))
+ goto enomem;
+
+ memset(sgl, 0, sizeof(*sgl) * sgp->size);
+
+ /*
+ * first loop through, set initial index and return value
+ */
+ if (!ret) {
+ cmd->sglist_len = index;
+ ret = sgl;
+ }
+
+ /*
+ * chain previous sglist, if any. we know the previous
+ * sglist must be the biggest one, or we would not have
+ * ended up doing another loop.
+ */
+ if (prev)
+ sg_chain(prev, SCSI_MAX_SG_SEGMENTS, sgl);
+
+ /*
+ * don't allow subsequent mempool allocs to sleep, it would
+ * violate the mempool principle.
+ */
+ gfp_mask &= ~__GFP_WAIT;
+ gfp_mask |= __GFP_HIGH;
+ prev = sgl;
+ } while (left);
+
+ /*
+ * ->use_sg may get modified after dma mapping has potentially
+ * shrunk the number of segments, so keep a copy of it for free.
+ */
+ cmd->__use_sg = cmd->use_sg;
+ return ret;
+enomem:
+ if (ret) {
+ /*
+ * Free entries chained off ret. Since we were trying to
+ * allocate another sglist, we know that all entries are of
+ * the max size.
+ */
+ sgp = scsi_sg_pools + SG_MEMPOOL_NR - 1;
+ prev = ret;
+ ret = &ret[SCSI_MAX_SG_SEGMENTS - 1];
+
+ while ((sgl = sg_chain_ptr(ret)) != NULL) {
+ ret = &sgl[SCSI_MAX_SG_SEGMENTS - 1];
+ mempool_free(sgl, sgp->pool);
+ }
+
+ mempool_free(prev, sgp->pool);
+ }
+ return NULL;
}
EXPORT_SYMBOL(scsi_alloc_sgtable);
@@ -752,6 +820,42 @@ void scsi_free_sgtable(struct scsi_cmnd *cmd)
BUG_ON(cmd->sglist_len >= SG_MEMPOOL_NR);
+ /*
+ * if this is the biggest size sglist, check if we have
+ * chained parts we need to free
+ */
+ if (cmd->__use_sg > SCSI_MAX_SG_SEGMENTS) {
+ unsigned short this, left;
+ struct scatterlist *next;
+ unsigned int index;
+
+ left = cmd->__use_sg - (SCSI_MAX_SG_SEGMENTS - 1);
+ next = sg_chain_ptr(&sgl[SCSI_MAX_SG_SEGMENTS - 1]);
+ do {
+ sgl = next;
+ this = left;
+ if (this > SCSI_MAX_SG_SEGMENTS) {
+ this = SCSI_MAX_SG_SEGMENTS - 1;
+ index = SG_MEMPOOL_NR - 1;
+ } else
+ index = scsi_sgtable_index(this);
+
+ left -= this;
+
+ sgp = scsi_sg_pools + index;
+
+ if (left)
+ next = sg_chain_ptr(&sgl[sgp->size - 1]);
+
+ mempool_free(sgl, sgp->pool);
+ } while (left);
+
+ /*
+ * Restore original, will be freed below
+ */
+ sgl = cmd->request_buffer;
+ }
+
sgp = scsi_sg_pools + cmd->sglist_len;
mempool_free(sgl, sgp->pool);
}
@@ -993,7 +1097,6 @@ EXPORT_SYMBOL(scsi_io_completion);
static int scsi_init_io(struct scsi_cmnd *cmd)
{
struct request *req = cmd->request;
- struct scatterlist *sgpnt;
int count;
/*
@@ -1006,14 +1109,13 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
/*
* If sg table allocation fails, requeue request later.
*/
- sgpnt = scsi_alloc_sgtable(cmd, GFP_ATOMIC);
- if (unlikely(!sgpnt)) {
+ cmd->request_buffer = scsi_alloc_sgtable(cmd, GFP_ATOMIC);
+ if (unlikely(!cmd->request_buffer)) {
scsi_unprep_request(req);
return BLKPREP_DEFER;
}
req->buffer = NULL;
- cmd->request_buffer = (char *) sgpnt;
if (blk_pc_request(req))
cmd->request_bufflen = req->data_len;
else
@@ -1577,8 +1679,22 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
if (!q)
return NULL;
+ /*
+ * this limit is imposed by hardware restrictions
+ */
blk_queue_max_hw_segments(q, shost->sg_tablesize);
- blk_queue_max_phys_segments(q, SCSI_MAX_PHYS_SEGMENTS);
+
+ /*
+ * In the future, sg chaining support will be mandatory and this
+ * ifdef can then go away. Right now we don't have all archs
+ * converted, so better keep it safe.
+ */
+#ifdef ARCH_HAS_SG_CHAIN
+ blk_queue_max_phys_segments(q, SCSI_MAX_SG_CHAIN_SEGMENTS);
+#else
+ blk_queue_max_phys_segments(q, SCSI_MAX_SG_SEGMENTS);
+#endif
+
blk_queue_max_sectors(q, shost->max_sectors);
blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost));
blk_queue_segment_boundary(q, shost->dma_boundary);
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 9f8f80a..702fcfe 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -11,13 +11,6 @@
#include <linux/types.h>
/*
- * The maximum sg list length SCSI can cope with
- * (currently must be a power of 2 between 32 and 256)
- */
-#define SCSI_MAX_PHYS_SEGMENTS MAX_PHYS_SEGMENTS
-
-
-/*
* SCSI command lengths
*/
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index d7db992..fc649af 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -72,6 +72,7 @@ struct scsi_cmnd {
/* These elements define the operation we ultimately want to perform */
unsigned short use_sg; /* Number of pieces of scatter-gather */
unsigned short sglist_len; /* size of malloc'd scatter-gather list */
+ unsigned short __use_sg;
unsigned underflow; /* Return error if less than
this amount is transferred */
--
1.5.2.rc1
This converts SCSI/IDE/etc drivers to sg chaining support. The
patches exist as seperate entities in the #sglist branch of the
block git repo, but collated here to avoid a huge thread.
Signed-off-by: Jens Axboe <[email protected]>
diff --git a/arch/ia64/hp/sim/simscsi.c b/arch/ia64/hp/sim/simscsi.c
index bb87682..291e7f4 100644
--- a/arch/ia64/hp/sim/simscsi.c
+++ b/arch/ia64/hp/sim/simscsi.c
@@ -173,7 +173,7 @@ simscsi_sg_readwrite (struct scsi_cmnd *sc, int mode, unsigned long offset)
return;
}
offset += sl->length;
- sl++;
+ sl = sg_next(sl);
list_len--;
}
sc->result = GOOD;
@@ -239,18 +239,23 @@ simscsi_readwrite10 (struct scsi_cmnd *sc, int mode)
static void simscsi_fillresult(struct scsi_cmnd *sc, char *buf, unsigned len)
{
- int scatterlen = sc->use_sg;
- struct scatterlist *slp;
+ int scatterlen = sc->use_sg, i;
+ struct scatterlist *slp, *sg;
if (scatterlen == 0)
memcpy(sc->request_buffer, buf, len);
- else for (slp = (struct scatterlist *)sc->request_buffer;
- scatterlen-- > 0 && len > 0; slp++) {
- unsigned thislen = min(len, slp->length);
+ else {
+ slp = sc->request_buffer;
+ for_each_sg(slp, sg, scatterlen, i) {
+ unsigned thislen;
- memcpy(page_address(slp->page) + slp->offset, buf, thislen);
- slp++;
- len -= thislen;
+ if (len <= 0)
+ break;
+
+ thislen = min(len, slp->length);
+ memcpy(page_address(sg->page) + sg->offset, buf, thislen);
+ len -= thislen;
+ }
}
}
diff --git a/drivers/ide/cris/ide-cris.c b/drivers/ide/cris/ide-cris.c
index ca0341c..3565c76 100644
--- a/drivers/ide/cris/ide-cris.c
+++ b/drivers/ide/cris/ide-cris.c
@@ -951,7 +951,8 @@ static int cris_ide_build_dmatable (ide_drive_t *drive)
/* group sequential buffers into one large buffer */
addr = page_to_phys(sg->page) + sg->offset;
size = sg_dma_len(sg);
- while (sg++, --i) {
+ while (--i) {
+ sg = sg_next(sg);
if ((addr + size) != page_to_phys(sg->page) + sg->offset)
break;
size += sg_dma_len(sg);
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index b77b7d1..aa13309 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -292,7 +292,7 @@ int ide_build_dmatable (ide_drive_t *drive, struct request *rq)
}
}
- sg++;
+ sg = sg_next(sg);
i--;
}
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index 30175c7..412ba5e 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -259,6 +259,7 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
+ struct scatterlist *cursg = hwif->cursg;
struct page *page;
#ifdef CONFIG_HIGHMEM
unsigned long flags;
@@ -266,8 +267,14 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
unsigned int offset;
u8 *buf;
- page = sg[hwif->cursg].page;
- offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;
+ cursg = hwif->cursg;
+ if (!cursg) {
+ cursg = sg;
+ hwif->cursg = sg;
+ }
+
+ page = cursg->page;
+ offset = cursg->offset + hwif->cursg_ofs * SECTOR_SIZE;
/* get the current page and offset */
page = nth_page(page, (offset >> PAGE_SHIFT));
@@ -281,8 +288,8 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
hwif->nleft--;
hwif->cursg_ofs++;
- if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
- hwif->cursg++;
+ if ((hwif->cursg_ofs * SECTOR_SIZE) == cursg->length) {
+ hwif->cursg = sg_next(hwif->cursg);
hwif->cursg_ofs = 0;
}
@@ -363,6 +370,8 @@ static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
{
+ HWIF(drive)->cursg = NULL;
+
if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
ide_task_t *task = rq->special;
diff --git a/drivers/ide/mips/au1xxx-ide.c b/drivers/ide/mips/au1xxx-ide.c
index ca95e99..35b0d1e 100644
--- a/drivers/ide/mips/au1xxx-ide.c
+++ b/drivers/ide/mips/au1xxx-ide.c
@@ -324,7 +324,7 @@ static int auide_build_dmatable(ide_drive_t *drive)
cur_addr += tc;
cur_len -= tc;
}
- sg++;
+ sg = sg_next(sg);
i--;
}
diff --git a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
index d3185e2..511e734 100644
--- a/drivers/ide/pci/sgiioc4.c
+++ b/drivers/ide/pci/sgiioc4.c
@@ -531,7 +531,7 @@ sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
}
}
- sg++;
+ sg = sg_next(sg);
i--;
}
diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
index 45fc36f..2a7555d 100644
--- a/drivers/ide/ppc/pmac.c
+++ b/drivers/ide/ppc/pmac.c
@@ -1648,7 +1648,7 @@ pmac_ide_build_dmatable(ide_drive_t *drive, struct request *rq)
cur_len -= tc;
++table;
}
- sg++;
+ sg = sg_next(sg);
i--;
}
diff --git a/drivers/infiniband/hw/ipath/ipath_dma.c b/drivers/infiniband/hw/ipath/ipath_dma.c
index f87f003..62c87e6 100644
--- a/drivers/infiniband/hw/ipath/ipath_dma.c
+++ b/drivers/infiniband/hw/ipath/ipath_dma.c
@@ -96,17 +96,18 @@ static void ipath_dma_unmap_page(struct ib_device *dev,
BUG_ON(!valid_dma_direction(direction));
}
-static int ipath_map_sg(struct ib_device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction direction)
+static int ipath_map_sg(struct ib_device *dev, struct scatterlist *sgl,
+ int nents, enum dma_data_direction direction)
{
+ struct scatterlist *sg;
u64 addr;
int i;
int ret = nents;
BUG_ON(!valid_dma_direction(direction));
- for (i = 0; i < nents; i++) {
- addr = (u64) page_address(sg[i].page);
+ for_each_sg(sgl, sg, nents, i) {
+ addr = (u64) page_address(sg->page);
/* TODO: handle highmem pages */
if (!addr) {
ret = 0;
diff --git a/drivers/infiniband/ulp/iser/iser_memory.c b/drivers/infiniband/ulp/iser/iser_memory.c
index fc9f1fd..ff0c701 100644
--- a/drivers/infiniband/ulp/iser/iser_memory.c
+++ b/drivers/infiniband/ulp/iser/iser_memory.c
@@ -37,7 +37,6 @@
#include <linux/mm.h>
#include <linux/highmem.h>
#include <asm/io.h>
-#include <asm/scatterlist.h>
#include <linux/scatterlist.h>
#include "iscsi_iser.h"
@@ -126,17 +125,19 @@ int iser_start_rdma_unaligned_sg(struct iscsi_iser_cmd_task *iser_ctask,
if (cmd_dir == ISER_DIR_OUT) {
/* copy the unaligned sg the buffer which is used for RDMA */
- struct scatterlist *sg = (struct scatterlist *)data->buf;
+ struct scatterlist *sgl = (struct scatterlist *)data->buf;
+ struct scatterlist *sg;
int i;
char *p, *from;
- for (p = mem, i = 0; i < data->size; i++) {
- from = kmap_atomic(sg[i].page, KM_USER0);
+ p = mem;
+ for_each_sg(sgl, sg, data->size, i) {
+ from = kmap_atomic(sg->page, KM_USER0);
memcpy(p,
- from + sg[i].offset,
- sg[i].length);
+ from + sg->offset,
+ sg->length);
kunmap_atomic(from, KM_USER0);
- p += sg[i].length;
+ p += sg->length;
}
}
@@ -178,7 +179,7 @@ void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *iser_ctask,
if (cmd_dir == ISER_DIR_IN) {
char *mem;
- struct scatterlist *sg;
+ struct scatterlist *sgl, *sg;
unsigned char *p, *to;
unsigned int sg_size;
int i;
@@ -186,16 +187,17 @@ void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *iser_ctask,
/* copy back read RDMA to unaligned sg */
mem = mem_copy->copy_buf;
- sg = (struct scatterlist *)iser_ctask->data[ISER_DIR_IN].buf;
+ sgl = (struct scatterlist *)iser_ctask->data[ISER_DIR_IN].buf;
sg_size = iser_ctask->data[ISER_DIR_IN].size;
- for (p = mem, i = 0; i < sg_size; i++){
- to = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
- memcpy(to + sg[i].offset,
+ p = mem;
+ for_each_sg(sgl, sg, sg_size, i) {
+ to = kmap_atomic(sg->page, KM_SOFTIRQ0);
+ memcpy(to + sg->offset,
p,
- sg[i].length);
+ sg->length);
kunmap_atomic(to, KM_SOFTIRQ0);
- p += sg[i].length;
+ p += sg->length;
}
}
@@ -226,7 +228,8 @@ static int iser_sg_to_page_vec(struct iser_data_buf *data,
struct iser_page_vec *page_vec,
struct ib_device *ibdev)
{
- struct scatterlist *sg = (struct scatterlist *)data->buf;
+ struct scatterlist *sgl = (struct scatterlist *)data->buf;
+ struct scatterlist *sg;
u64 first_addr, last_addr, page;
int end_aligned;
unsigned int cur_page = 0;
@@ -234,14 +237,14 @@ static int iser_sg_to_page_vec(struct iser_data_buf *data,
int i;
/* compute the offset of first element */
- page_vec->offset = (u64) sg[0].offset & ~MASK_4K;
+ page_vec->offset = (u64) sgl[0].offset & ~MASK_4K;
- for (i = 0; i < data->dma_nents; i++) {
- unsigned int dma_len = ib_sg_dma_len(ibdev, &sg[i]);
+ for_each_sg(sgl, sg, data->dma_nents, i) {
+ unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
total_sz += dma_len;
- first_addr = ib_sg_dma_address(ibdev, &sg[i]);
+ first_addr = ib_sg_dma_address(ibdev, sg);
last_addr = first_addr + dma_len;
end_aligned = !(last_addr & ~MASK_4K);
@@ -249,9 +252,9 @@ static int iser_sg_to_page_vec(struct iser_data_buf *data,
/* continue to collect page fragments till aligned or SG ends */
while (!end_aligned && (i + 1 < data->dma_nents)) {
i++;
- dma_len = ib_sg_dma_len(ibdev, &sg[i]);
+ dma_len = ib_sg_dma_len(ibdev, sg);
total_sz += dma_len;
- last_addr = ib_sg_dma_address(ibdev, &sg[i]) + dma_len;
+ last_addr = ib_sg_dma_address(ibdev, sg) + dma_len;
end_aligned = !(last_addr & ~MASK_4K);
}
@@ -286,25 +289,26 @@ static int iser_sg_to_page_vec(struct iser_data_buf *data,
static unsigned int iser_data_buf_aligned_len(struct iser_data_buf *data,
struct ib_device *ibdev)
{
- struct scatterlist *sg;
+ struct scatterlist *sgl, *sg;
u64 end_addr, next_addr;
int i, cnt;
unsigned int ret_len = 0;
- sg = (struct scatterlist *)data->buf;
+ sgl = (struct scatterlist *)data->buf;
- for (cnt = 0, i = 0; i < data->dma_nents; i++, cnt++) {
+ cnt = 0;
+ for_each_sg(sgl, sg, data->dma_nents, i) {
/* iser_dbg("Checking sg iobuf [%d]: phys=0x%08lX "
"offset: %ld sz: %ld\n", i,
- (unsigned long)page_to_phys(sg[i].page),
- (unsigned long)sg[i].offset,
- (unsigned long)sg[i].length); */
- end_addr = ib_sg_dma_address(ibdev, &sg[i]) +
- ib_sg_dma_len(ibdev, &sg[i]);
+ (unsigned long)page_to_phys(sg->page),
+ (unsigned long)sg->offset,
+ (unsigned long)sg->length); */
+ end_addr = ib_sg_dma_address(ibdev, sg) +
+ ib_sg_dma_len(ibdev, sg);
/* iser_dbg("Checking sg iobuf end address "
"0x%08lX\n", end_addr); */
if (i + 1 < data->dma_nents) {
- next_addr = ib_sg_dma_address(ibdev, &sg[i+1]);
+ next_addr = ib_sg_dma_address(ibdev, sg_next(sg));
/* are i, i+1 fragments of the same page? */
if (end_addr == next_addr)
continue;
@@ -324,15 +328,16 @@ static unsigned int iser_data_buf_aligned_len(struct iser_data_buf *data,
static void iser_data_buf_dump(struct iser_data_buf *data,
struct ib_device *ibdev)
{
- struct scatterlist *sg = (struct scatterlist *)data->buf;
+ struct scatterlist *sgl = (struct scatterlist *)data->buf;
+ struct scatterlist *sg;
int i;
- for (i = 0; i < data->dma_nents; i++)
+ for_each_sg(sgl, sg, data->dma_nents, i)
iser_err("sg[%d] dma_addr:0x%lX page:0x%p "
"off:0x%x sz:0x%x dma_len:0x%x\n",
- i, (unsigned long)ib_sg_dma_address(ibdev, &sg[i]),
- sg[i].page, sg[i].offset,
- sg[i].length, ib_sg_dma_len(ibdev, &sg[i]));
+ i, (unsigned long)ib_sg_dma_address(ibdev, sg),
+ sg->page, sg->offset,
+ sg->length, ib_sg_dma_len(ibdev, sg));
}
static void iser_dump_page_vec(struct iser_page_vec *page_vec)
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 39bf057..c31d50d 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -595,6 +595,7 @@ static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
int ret;
struct srp_device *dev = target->srp_host->dev;
struct ib_device *ibdev = dev->dev;
+ struct scatterlist *sg;
if (!dev->fmr_pool)
return -ENODEV;
@@ -604,16 +605,16 @@ static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
return -EINVAL;
len = page_cnt = 0;
- for (i = 0; i < sg_cnt; ++i) {
- unsigned int dma_len = ib_sg_dma_len(ibdev, &scat[i]);
+ for_each_sg(scat, sg, sg_cnt, i) {
+ unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
- if (ib_sg_dma_address(ibdev, &scat[i]) & ~dev->fmr_page_mask) {
+ if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
if (i > 0)
return -EINVAL;
else
++page_cnt;
}
- if ((ib_sg_dma_address(ibdev, &scat[i]) + dma_len) &
+ if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
~dev->fmr_page_mask) {
if (i < sg_cnt - 1)
return -EINVAL;
@@ -633,12 +634,12 @@ static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
return -ENOMEM;
page_cnt = 0;
- for (i = 0; i < sg_cnt; ++i) {
- unsigned int dma_len = ib_sg_dma_len(ibdev, &scat[i]);
+ for_each_sg(scat, sg, sg_cnt, i) {
+ unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
for (j = 0; j < dma_len; j += dev->fmr_page_size)
dma_pages[page_cnt++] =
- (ib_sg_dma_address(ibdev, &scat[i]) &
+ (ib_sg_dma_address(ibdev, sg) &
dev->fmr_page_mask) + j;
}
@@ -724,6 +725,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
* descriptor.
*/
struct srp_indirect_buf *buf = (void *) cmd->add_data;
+ struct scatterlist *sg;
u32 datalen = 0;
int i;
@@ -732,11 +734,11 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
sizeof (struct srp_indirect_buf) +
count * sizeof (struct srp_direct_buf);
- for (i = 0; i < count; ++i) {
- unsigned int dma_len = ib_sg_dma_len(ibdev, &scat[i]);
+ for_each_sg(scat, sg, count, i) {
+ unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
buf->desc_list[i].va =
- cpu_to_be64(ib_sg_dma_address(ibdev, &scat[i]));
+ cpu_to_be64(ib_sg_dma_address(ibdev, sg));
buf->desc_list[i].key =
cpu_to_be32(dev->mr->rkey);
buf->desc_list[i].len = cpu_to_be32(dma_len);
diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
index fa0f776..8844167 100644
--- a/drivers/message/fusion/mptscsih.c
+++ b/drivers/message/fusion/mptscsih.c
@@ -315,7 +315,7 @@ nextSGEset:
v2 = sg_dma_address(sg);
mptscsih_add_sge(psge, sgflags | thisxfer, v2);
- sg++; /* Get next SG element from the OS */
+ sg = sg_next(sg); /* Get next SG element from the OS */
psge += (sizeof(u32) + sizeof(dma_addr_t));
sgeOffset += (sizeof(u32) + sizeof(dma_addr_t));
sg_done++;
@@ -336,7 +336,7 @@ nextSGEset:
v2 = sg_dma_address(sg);
mptscsih_add_sge(psge, sgflags | thisxfer, v2);
/*
- sg++;
+ sg = sg_next(sg);
psge += (sizeof(u32) + sizeof(dma_addr_t));
*/
sgeOffset += (sizeof(u32) + sizeof(dma_addr_t));
diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
index eb766c3..293cfd2 100644
--- a/drivers/scsi/3w-9xxx.c
+++ b/drivers/scsi/3w-9xxx.c
@@ -1815,7 +1815,7 @@ static int twa_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id,
u32 num_sectors = 0x0;
int i, sg_count;
struct scsi_cmnd *srb = NULL;
- struct scatterlist *sglist = NULL;
+ struct scatterlist *sglist = NULL, *sg;
dma_addr_t buffaddr = 0x0;
int retval = 1;
@@ -1893,9 +1893,9 @@ static int twa_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id,
if (sg_count == 0)
goto out;
- for (i = 0; i < sg_count; i++) {
- command_packet->sg_list[i].address = TW_CPU_TO_SGL(sg_dma_address(&sglist[i]));
- command_packet->sg_list[i].length = cpu_to_le32(sg_dma_len(&sglist[i]));
+ for_each_sg(sglist, sg, sg_count, i) {
+ command_packet->sg_list[i].address = TW_CPU_TO_SGL(sg_dma_address(sg));
+ command_packet->sg_list[i].length = cpu_to_le32(sg_dma_len(sg));
if (command_packet->sg_list[i].address & TW_CPU_TO_SGL(TW_ALIGNMENT_9000_SGL)) {
TW_PRINTK(tw_dev->host, TW_DRIVER, 0x2e, "Found unaligned sgl address during execute scsi");
goto out;
diff --git a/drivers/scsi/3w-xxxx.c b/drivers/scsi/3w-xxxx.c
index 656bdb1..3d005cf 100644
--- a/drivers/scsi/3w-xxxx.c
+++ b/drivers/scsi/3w-xxxx.c
@@ -1767,7 +1767,7 @@ static int tw_scsiop_read_write(TW_Device_Extension *tw_dev, int request_id)
u32 lba = 0x0, num_sectors = 0x0, buffaddr = 0x0;
int i, use_sg;
struct scsi_cmnd *srb;
- struct scatterlist *sglist;
+ struct scatterlist *sglist, *sg;
dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_write()\n");
@@ -1837,9 +1837,9 @@ static int tw_scsiop_read_write(TW_Device_Extension *tw_dev, int request_id)
if (use_sg == 0)
return 1;
- for (i=0;i<use_sg; i++) {
- command_packet->byte8.io.sgl[i].address = sg_dma_address(&sglist[i]);
- command_packet->byte8.io.sgl[i].length = sg_dma_len(&sglist[i]);
+ for_each_sg(sglist, sg, use_sg, i) {
+ command_packet->byte8.io.sgl[i].address = sg_dma_address(sg);
+ command_packet->byte8.io.sgl[i].length = sg_dma_len(sg);
command_packet->size+=2;
}
}
diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c
index cb02656..821163d 100644
--- a/drivers/scsi/53c700.c
+++ b/drivers/scsi/53c700.c
@@ -1887,6 +1887,7 @@ NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
int i;
int sg_count;
dma_addr_t vPtr = 0;
+ struct scatterlist *sgl, *sg;
__u32 count = 0;
if(SCp->use_sg) {
@@ -1902,15 +1903,12 @@ NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
slot->dma_handle = vPtr;
sg_count = 1;
}
-
-
- for(i = 0; i < sg_count; i++) {
-
- if(SCp->use_sg) {
- struct scatterlist *sg = SCp->request_buffer;
-
- vPtr = sg_dma_address(&sg[i]);
- count = sg_dma_len(&sg[i]);
+
+ sgl = SCp->request_buffer;
+ for_each_sg(sgl, sg, sg_count, i) {
+ if (SCp->use_sg) {
+ vPtr = sg_dma_address(sg);
+ count = sg_dma_len(sg);
}
slot->SG[i].ins = bS_to_host(move_ins | count);
diff --git a/drivers/scsi/BusLogic.c b/drivers/scsi/BusLogic.c
index 96f4cab..7fd1cca 100644
--- a/drivers/scsi/BusLogic.c
+++ b/drivers/scsi/BusLogic.c
@@ -2862,6 +2862,7 @@ static int BusLogic_QueueCommand(struct scsi_cmnd *Command, void (*CompletionRou
Command->sc_data_direction);
} else if (SegmentCount != 0) {
struct scatterlist *ScatterList = (struct scatterlist *) BufferPointer;
+ struct scatterlist *sg;
int Segment, Count;
Count = pci_map_sg(HostAdapter->PCI_Device, ScatterList, SegmentCount,
@@ -2872,9 +2873,9 @@ static int BusLogic_QueueCommand(struct scsi_cmnd *Command, void (*CompletionRou
CCB->DataPointer = (unsigned int) CCB->DMA_Handle + ((unsigned long) &CCB->ScatterGatherList - (unsigned long) CCB);
else
CCB->DataPointer = Virtual_to_32Bit_Virtual(CCB->ScatterGatherList);
- for (Segment = 0; Segment < Count; Segment++) {
- CCB->ScatterGatherList[Segment].SegmentByteCount = sg_dma_len(ScatterList + Segment);
- CCB->ScatterGatherList[Segment].SegmentDataPointer = sg_dma_address(ScatterList + Segment);
+ for_each_sg(ScatterList, sg, Count, Segment) {
+ CCB->ScatterGatherList[Segment].SegmentByteCount = sg_dma_len(sg);
+ CCB->ScatterGatherList[Segment].SegmentDataPointer = sg_dma_address(sg);
}
} else {
CCB->Opcode = BusLogic_InitiatorCCB;
diff --git a/drivers/scsi/NCR53c406a.c b/drivers/scsi/NCR53c406a.c
index 7c0b17f..9402dd9 100644
--- a/drivers/scsi/NCR53c406a.c
+++ b/drivers/scsi/NCR53c406a.c
@@ -875,12 +875,13 @@ static void NCR53c406a_intr(void *dev_id)
if (!current_SC->use_sg) /* Don't use scatter-gather */
NCR53c406a_pio_write(current_SC->request_buffer, current_SC->request_bufflen);
else { /* use scatter-gather */
+ struct scatterlist *sg;
+ int i;
+
sgcount = current_SC->use_sg;
sglist = current_SC->request_buffer;
- while (sgcount--) {
- NCR53c406a_pio_write(page_address(sglist->page) + sglist->offset, sglist->length);
- sglist++;
- }
+ for_each_sg(sglist, sg, sgcount, i)
+ NCR53c406a_pio_write(page_address(sg->page) + sg->offset, sg->length);
}
REG0;
#endif /* USE_PIO */
@@ -902,12 +903,13 @@ static void NCR53c406a_intr(void *dev_id)
if (!current_SC->use_sg) /* Don't use scatter-gather */
NCR53c406a_pio_read(current_SC->request_buffer, current_SC->request_bufflen);
else { /* Use scatter-gather */
+ struct scatterlist *sg;
+ int i;
+
sgcount = current_SC->use_sg;
sglist = current_SC->request_buffer;
- while (sgcount--) {
- NCR53c406a_pio_read(page_address(sglist->page) + sglist->offset, sglist->length);
- sglist++;
- }
+ for_each_sg(sglist, sg, sgcount, i)
+ NCR53c406a_pio_read(page_address(sg->page) + sg->offset, sg->length);
}
REG0;
#endif /* USE_PIO */
diff --git a/drivers/scsi/a100u2w.c b/drivers/scsi/a100u2w.c
index 7f4241b..1353900 100644
--- a/drivers/scsi/a100u2w.c
+++ b/drivers/scsi/a100u2w.c
@@ -796,7 +796,7 @@ static void orc_interrupt(
*****************************************************************************/
static void inia100BuildSCB(ORC_HCS * pHCB, ORC_SCB * pSCB, struct scsi_cmnd * SCpnt)
{ /* Create corresponding SCB */
- struct scatterlist *pSrbSG;
+ struct scatterlist *pSrbSG, *sg;
ORC_SG *pSG; /* Pointer to SG list */
int i, count_sg;
ESCB *pEScb;
@@ -820,9 +820,10 @@ static void inia100BuildSCB(ORC_HCS * pHCB, ORC_SCB * pSCB, struct scsi_cmnd * S
count_sg = pci_map_sg(pHCB->pdev, pSrbSG, SCpnt->use_sg,
SCpnt->sc_data_direction);
pSCB->SCB_SGLen = (U32) (count_sg * 8);
- for (i = 0; i < count_sg; i++, pSG++, pSrbSG++) {
- pSG->SG_Ptr = (U32) sg_dma_address(pSrbSG);
- pSG->SG_Len = (U32) sg_dma_len(pSrbSG);
+ for_each_sg(pSrbSG, sg, count_sg, i) {
+ pSG->SG_Ptr = (U32) sg_dma_address(sg);
+ pSG->SG_Len = (U32) sg_dma_len(sg);
+ pSG++;
}
} else if (SCpnt->request_bufflen != 0) {/* Non SG */
pSCB->SCB_SGLen = 0x8;
diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index 1e82c69..7fcac4e 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -2347,7 +2347,7 @@ static unsigned long aac_build_sg(struct scsi_cmnd* scsicmd, struct sgmap* psg)
psg->sg[0].addr = 0;
psg->sg[0].count = 0;
if (scsicmd->use_sg) {
- struct scatterlist *sg;
+ struct scatterlist *sg, *s;
int i;
int sg_count;
sg = (struct scatterlist *) scsicmd->request_buffer;
@@ -2356,11 +2356,10 @@ static unsigned long aac_build_sg(struct scsi_cmnd* scsicmd, struct sgmap* psg)
scsicmd->sc_data_direction);
psg->count = cpu_to_le32(sg_count);
- for (i = 0; i < sg_count; i++) {
- psg->sg[i].addr = cpu_to_le32(sg_dma_address(sg));
- psg->sg[i].count = cpu_to_le32(sg_dma_len(sg));
- byte_count += sg_dma_len(sg);
- sg++;
+ for_each_sg(sg, s, sg_count, i) {
+ psg->sg[i].addr = cpu_to_le32(sg_dma_address(s));
+ psg->sg[i].count = cpu_to_le32(sg_dma_len(s));
+ byte_count += sg_dma_len(s);
}
/* hba wants the size to be exact */
if(byte_count > scsicmd->request_bufflen){
@@ -2404,7 +2403,7 @@ static unsigned long aac_build_sg64(struct scsi_cmnd* scsicmd, struct sgmap64* p
psg->sg[0].addr[1] = 0;
psg->sg[0].count = 0;
if (scsicmd->use_sg) {
- struct scatterlist *sg;
+ struct scatterlist *sg, *s;
int i;
int sg_count;
sg = (struct scatterlist *) scsicmd->request_buffer;
@@ -2412,14 +2411,13 @@ static unsigned long aac_build_sg64(struct scsi_cmnd* scsicmd, struct sgmap64* p
sg_count = pci_map_sg(dev->pdev, sg, scsicmd->use_sg,
scsicmd->sc_data_direction);
- for (i = 0; i < sg_count; i++) {
- int count = sg_dma_len(sg);
- addr = sg_dma_address(sg);
+ for_each_sg(sg, s, sg_count, i) {
+ int count = sg_dma_len(s);
+ addr = sg_dma_address(s);
psg->sg[i].addr[0] = cpu_to_le32(addr & 0xffffffff);
psg->sg[i].addr[1] = cpu_to_le32(addr>>32);
psg->sg[i].count = cpu_to_le32(count);
byte_count += count;
- sg++;
}
psg->count = cpu_to_le32(sg_count);
/* hba wants the size to be exact */
@@ -2465,7 +2463,7 @@ static unsigned long aac_build_sgraw(struct scsi_cmnd* scsicmd, struct sgmapraw*
psg->sg[0].count = 0;
psg->sg[0].flags = 0;
if (scsicmd->use_sg) {
- struct scatterlist *sg;
+ struct scatterlist *sg, *s;
int i;
int sg_count;
sg = (struct scatterlist *) scsicmd->request_buffer;
@@ -2473,9 +2471,9 @@ static unsigned long aac_build_sgraw(struct scsi_cmnd* scsicmd, struct sgmapraw*
sg_count = pci_map_sg(dev->pdev, sg, scsicmd->use_sg,
scsicmd->sc_data_direction);
- for (i = 0; i < sg_count; i++) {
- int count = sg_dma_len(sg);
- u64 addr = sg_dma_address(sg);
+ for_each_sg(sg, s, sg_count, i) {
+ int count = sg_dma_len(s);
+ u64 addr = sg_dma_address(s);
psg->sg[i].next = 0;
psg->sg[i].prev = 0;
psg->sg[i].addr[1] = cpu_to_le32((u32)(addr>>32));
@@ -2483,7 +2481,6 @@ static unsigned long aac_build_sgraw(struct scsi_cmnd* scsicmd, struct sgmapraw*
psg->sg[i].count = cpu_to_le32(count);
psg->sg[i].flags = 0;
byte_count += count;
- sg++;
}
psg->count = cpu_to_le32(sg_count);
/* hba wants the size to be exact */
diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c
index 9b3303b..06bf40c 100644
--- a/drivers/scsi/advansys.c
+++ b/drivers/scsi/advansys.c
@@ -6468,7 +6468,7 @@ asc_build_req(asc_board_t *boardp, struct scsi_cmnd *scp)
*/
int sgcnt;
int use_sg;
- struct scatterlist *slp;
+ struct scatterlist *slp, *sg;
slp = (struct scatterlist *)scp->request_buffer;
use_sg = dma_map_sg(dev, slp, scp->use_sg, scp->sc_data_direction);
@@ -6502,10 +6502,10 @@ asc_build_req(asc_board_t *boardp, struct scsi_cmnd *scp)
/*
* Convert scatter-gather list into ASC_SG_HEAD list.
*/
- for (sgcnt = 0; sgcnt < use_sg; sgcnt++, slp++) {
- asc_sg_head.sg_list[sgcnt].addr = cpu_to_le32(sg_dma_address(slp));
- asc_sg_head.sg_list[sgcnt].bytes = cpu_to_le32(sg_dma_len(slp));
- ASC_STATS_ADD(scp->device->host, sg_xfer, ASC_CEILING(sg_dma_len(slp), 512));
+ for_each_sg(slp, sg, use_sg, sgcnt) {
+ asc_sg_head.sg_list[sgcnt].addr = cpu_to_le32(sg_dma_address(sg));
+ asc_sg_head.sg_list[sgcnt].bytes = cpu_to_le32(sg_dma_len(sg));
+ ASC_STATS_ADD(scp->device->host, sg_xfer, ASC_CEILING(sg_dma_len(sg), 512));
}
}
@@ -6700,7 +6700,7 @@ adv_get_sglist(asc_board_t *boardp, adv_req_t *reqp, struct scsi_cmnd *scp, int
{
adv_sgblk_t *sgblkp;
ADV_SCSI_REQ_Q *scsiqp;
- struct scatterlist *slp;
+ struct scatterlist *slp, *sg;
int sg_elem_cnt;
ADV_SG_BLOCK *sg_block, *prev_sg_block;
ADV_PADDR sg_block_paddr;
@@ -6778,11 +6778,11 @@ adv_get_sglist(asc_board_t *boardp, adv_req_t *reqp, struct scsi_cmnd *scp, int
}
}
- for (i = 0; i < NO_OF_SG_PER_BLOCK; i++)
+ for_each_sg(slp, sg, NO_OF_SG_PER_BLOCK, i)
{
- sg_block->sg_list[i].sg_addr = cpu_to_le32(sg_dma_address(slp));
- sg_block->sg_list[i].sg_count = cpu_to_le32(sg_dma_len(slp));
- ASC_STATS_ADD(scp->device->host, sg_xfer, ASC_CEILING(sg_dma_len(slp), 512));
+ sg_block->sg_list[i].sg_addr = cpu_to_le32(sg_dma_address(sg));
+ sg_block->sg_list[i].sg_count = cpu_to_le32(sg_dma_len(sg));
+ ASC_STATS_ADD(scp->device->host, sg_xfer, ASC_CEILING(sg_dma_len(sg), 512));
if (--sg_elem_cnt == 0)
{ /* Last ADV_SG_BLOCK and scatter-gather entry. */
@@ -6790,7 +6790,6 @@ adv_get_sglist(asc_board_t *boardp, adv_req_t *reqp, struct scsi_cmnd *scp, int
sg_block->sg_ptr = 0L; /* Last ADV_SG_BLOCK in list. */
return ADV_SUCCESS;
}
- slp++;
}
sg_block->sg_cnt = NO_OF_SG_PER_BLOCK;
prev_sg_block = sg_block;
diff --git a/drivers/scsi/aha1542.c b/drivers/scsi/aha1542.c
index cbbfbc9..0a4d34b 100644
--- a/drivers/scsi/aha1542.c
+++ b/drivers/scsi/aha1542.c
@@ -691,7 +691,7 @@ static int aha1542_queuecommand(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
memcpy(ccb[mbo].cdb, cmd, ccb[mbo].cdblen);
if (SCpnt->use_sg) {
- struct scatterlist *sgpnt;
+ struct scatterlist *sgpnt, *sg;
struct chain *cptr;
#ifdef DEBUG
unsigned char *ptr;
@@ -706,16 +706,15 @@ static int aha1542_queuecommand(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
HOSTDATA(SCpnt->device->host)->SCint[mbo] = NULL;
return SCSI_MLQUEUE_HOST_BUSY;
}
- for (i = 0; i < SCpnt->use_sg; i++) {
- if (sgpnt[i].length == 0 || SCpnt->use_sg > 16 ||
- (((int) sgpnt[i].offset) & 1) || (sgpnt[i].length & 1)) {
+ for_each_sg(sgpnt, sg, SCpnt->use_sg, i) {
+ if (sg->length == 0 || SCpnt->use_sg > 16 ||
+ (((int) sg->offset) & 1) || (sg->length & 1)) {
unsigned char *ptr;
printk(KERN_CRIT "Bad segment list supplied to aha1542.c (%d, %d)\n", SCpnt->use_sg, i);
- for (i = 0; i < SCpnt->use_sg; i++) {
+ for_each_sg(sgpnt, sg, SCpnt->use_sg, i) {
printk(KERN_CRIT "%d: %p %d\n", i,
- (page_address(sgpnt[i].page) +
- sgpnt[i].offset),
- sgpnt[i].length);
+ (page_address(sg->page) +
+ sg->offset), sg->length);
};
printk(KERN_CRIT "cptr %x: ", (unsigned int) cptr);
ptr = (unsigned char *) &cptr[i];
@@ -723,10 +722,10 @@ static int aha1542_queuecommand(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
printk("%02x ", ptr[i]);
panic("Foooooooood fight!");
};
- any2scsi(cptr[i].dataptr, SCSI_SG_PA(&sgpnt[i]));
- if (SCSI_SG_PA(&sgpnt[i]) + sgpnt[i].length - 1 > ISA_DMA_THRESHOLD)
+ any2scsi(cptr[i].dataptr, SCSI_SG_PA(sg));
+ if (SCSI_SG_PA(sg) + sg->length - 1 > ISA_DMA_THRESHOLD)
BAD_SG_DMA(SCpnt, sgpnt, SCpnt->use_sg, i);
- any2scsi(cptr[i].datalen, sgpnt[i].length);
+ any2scsi(cptr[i].datalen, sg->length);
};
any2scsi(ccb[mbo].datalen, SCpnt->use_sg * sizeof(struct chain));
any2scsi(ccb[mbo].dataptr, SCSI_BUF_PA(cptr));
diff --git a/drivers/scsi/aha1740.c b/drivers/scsi/aha1740.c
index d7af9c6..2641c24 100644
--- a/drivers/scsi/aha1740.c
+++ b/drivers/scsi/aha1740.c
@@ -425,7 +425,7 @@ static int aha1740_queuecommand(Scsi_Cmnd * SCpnt, void (*done)(Scsi_Cmnd *))
sgptr->sg_dma_addr = sg_dma;
if (SCpnt->use_sg) {
- struct scatterlist * sgpnt;
+ struct scatterlist * sgpnt, * sg;
struct aha1740_chain * cptr;
int i, count;
DEB(unsigned char * ptr);
@@ -436,9 +436,9 @@ static int aha1740_queuecommand(Scsi_Cmnd * SCpnt, void (*done)(Scsi_Cmnd *))
cptr = sgptr->sg_chain;
count = dma_map_sg (&host->edev->dev, sgpnt, SCpnt->use_sg,
SCpnt->sc_data_direction);
- for(i=0; i < count; i++) {
- cptr[i].datalen = sg_dma_len (sgpnt + i);
- cptr[i].dataptr = sg_dma_address (sgpnt + i);
+ for_each_sg(sgpnt, sg, count, i) {
+ cptr[i].datalen = sg_dma_len (sg);
+ cptr[i].dataptr = sg_dma_address (sg);
}
host->ecb[ecbno].datalen = count*sizeof(struct aha1740_chain);
host->ecb[ecbno].dataptr = sg_dma;
diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
index 6054881..e7ab15b 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
@@ -1505,7 +1505,7 @@ ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
nseg = pci_map_sg(ahd->dev_softc, cur_seg,
cmd->use_sg, dir);
scb->platform_data->xfer_len = 0;
- for (sg = scb->sg_list; nseg > 0; nseg--, cur_seg++) {
+ for (sg = scb->sg_list; nseg > 0; nseg--) {
dma_addr_t addr;
bus_size_t len;
@@ -1514,6 +1514,7 @@ ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
scb->platform_data->xfer_len += len;
sg = ahd_sg_setup(ahd, scb, sg, addr, len,
/*last*/nseg == 1);
+ cur_seg = sg_next(cur_seg);
}
} else if (cmd->request_bufflen != 0) {
void *sg;
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
index 660f26e..bf85297 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -1475,20 +1475,19 @@ ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
if (cmd->use_sg != 0) {
struct ahc_dma_seg *sg;
struct scatterlist *cur_seg;
- struct scatterlist *end_seg;
- int nseg;
+ struct scatterlist *sgl;
+ int nseg, i;
- cur_seg = (struct scatterlist *)cmd->request_buffer;
- nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
+ sgl = (struct scatterlist *)cmd->request_buffer;
+ nseg = pci_map_sg(ahc->dev_softc, sgl, cmd->use_sg,
cmd->sc_data_direction);
- end_seg = cur_seg + nseg;
/* Copy the segments into the SG list. */
sg = scb->sg_list;
/*
* The sg_count may be larger than nseg if
* a transfer crosses a 32bit page.
*/
- while (cur_seg < end_seg) {
+ for_each_sg(sgl, cur_seg, nseg, i) {
dma_addr_t addr;
bus_size_t len;
int consumed;
@@ -1499,7 +1498,6 @@ ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
sg, addr, len);
sg += consumed;
scb->sg_count += consumed;
- cur_seg++;
}
sg--;
sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
diff --git a/drivers/scsi/aic94xx/aic94xx_task.c b/drivers/scsi/aic94xx/aic94xx_task.c
index e2ad5be..1327281 100644
--- a/drivers/scsi/aic94xx/aic94xx_task.c
+++ b/drivers/scsi/aic94xx/aic94xx_task.c
@@ -89,7 +89,7 @@ static inline int asd_map_scatterlist(struct sas_task *task,
res = -ENOMEM;
goto err_unmap;
}
- for (sc = task->scatter, i = 0; i < num_sg; i++, sc++) {
+ for_each_sg(task->scatter, sc, num_sg, i) {
struct sg_el *sg =
&((struct sg_el *)ascb->sg_arr->vaddr)[i];
sg->bus_addr = cpu_to_le64((u64)sg_dma_address(sc));
@@ -98,7 +98,7 @@ static inline int asd_map_scatterlist(struct sas_task *task,
sg->flags |= ASD_SG_EL_LIST_EOL;
}
- for (sc = task->scatter, i = 0; i < 2; i++, sc++) {
+ for_each_sg(task->scatter, sc, 2, i) {
sg_arr[i].bus_addr =
cpu_to_le64((u64)sg_dma_address(sc));
sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
@@ -110,7 +110,7 @@ static inline int asd_map_scatterlist(struct sas_task *task,
sg_arr[2].bus_addr=cpu_to_le64((u64)ascb->sg_arr->dma_handle);
} else {
int i;
- for (sc = task->scatter, i = 0; i < num_sg; i++, sc++) {
+ for_each_sg(task->scatter, sc, num_sg, i) {
sg_arr[i].bus_addr =
cpu_to_le64((u64)sg_dma_address(sc));
sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
index 8b46158..c2e2e95 100644
--- a/drivers/scsi/arcmsr/arcmsr_hba.c
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c
@@ -563,18 +563,18 @@ static void arcmsr_build_ccb(struct AdapterControlBlock *acb,
memcpy(arcmsr_cdb->Cdb, pcmd->cmnd, pcmd->cmd_len);
if (pcmd->use_sg) {
int length, sgcount, i, cdb_sgcount = 0;
- struct scatterlist *sl;
+ struct scatterlist *sl, *sg;
/* Get Scatter Gather List from scsiport. */
sl = (struct scatterlist *) pcmd->request_buffer;
sgcount = pci_map_sg(acb->pdev, sl, pcmd->use_sg,
pcmd->sc_data_direction);
/* map stor port SG list to our iop SG List. */
- for (i = 0; i < sgcount; i++) {
+ for_each_sg(sl, sg, sgcount, i) {
/* Get the physical address of the current data pointer */
- length = cpu_to_le32(sg_dma_len(sl));
- address_lo = cpu_to_le32(dma_addr_lo32(sg_dma_address(sl)));
- address_hi = cpu_to_le32(dma_addr_hi32(sg_dma_address(sl)));
+ length = cpu_to_le32(sg_dma_len(sg));
+ address_lo = cpu_to_le32(dma_addr_lo32(sg_dma_address(sg)));
+ address_hi = cpu_to_le32(dma_addr_hi32(sg_dma_address(sg)));
if (address_hi == 0) {
struct SG32ENTRY *pdma_sg = (struct SG32ENTRY *)psge;
@@ -591,7 +591,6 @@ static void arcmsr_build_ccb(struct AdapterControlBlock *acb,
psge += sizeof (struct SG64ENTRY);
arccdbsize += sizeof (struct SG64ENTRY);
}
- sl++;
cdb_sgcount++;
}
arcmsr_cdb->sgcount = (uint8_t)cdb_sgcount;
diff --git a/drivers/scsi/dc395x.c b/drivers/scsi/dc395x.c
index 564ea90..4e0f073 100644
--- a/drivers/scsi/dc395x.c
+++ b/drivers/scsi/dc395x.c
@@ -1010,6 +1010,7 @@ static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
u32 reqlen = cmd->request_bufflen;
struct scatterlist *sl = (struct scatterlist *)
cmd->request_buffer;
+ struct scatterlist *sg;
struct SGentry *sgp = srb->segment_x;
srb->sg_count = pci_map_sg(dcb->acb->dev, sl, cmd->use_sg,
dir);
@@ -1018,9 +1019,9 @@ static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
reqlen, cmd->request_buffer, cmd->use_sg,
srb->sg_count);
- for (i = 0; i < srb->sg_count; i++) {
- u32 busaddr = (u32)sg_dma_address(&sl[i]);
- u32 seglen = (u32)sl[i].length;
+ for_each_sg(sl, sg, srb->sg_count, i) {
+ u32 busaddr = (u32)sg_dma_address(sg);
+ u32 seglen = (u32)sg->length;
sgp[i].address = busaddr;
sgp[i].length = seglen;
srb->total_xfer_length += seglen;
diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
index 8c7d2bb..b63d4b2 100644
--- a/drivers/scsi/dpt_i2o.c
+++ b/drivers/scsi/dpt_i2o.c
@@ -2141,20 +2141,21 @@ static s32 adpt_scsi_to_i2o(adpt_hba* pHba, struct scsi_cmnd* cmd, struct adpt_d
reqlen = 14; // SINGLE SGE
/* Now fill in the SGList and command */
if(cmd->use_sg) {
- struct scatterlist *sg = (struct scatterlist *)cmd->request_buffer;
- int sg_count = pci_map_sg(pHba->pDev, sg, cmd->use_sg,
+ struct scatterlist *sgl = (struct scatterlist *)cmd->request_buffer;
+ struct scatterlist *sg;
+ int sg_count = pci_map_sg(pHba->pDev, sgl, cmd->use_sg,
cmd->sc_data_direction);
len = 0;
- for(i = 0 ; i < sg_count; i++) {
+ for_each_sg(sgl, sg, sg_count, i) {
*mptr++ = direction|0x10000000|sg_dma_len(sg);
len+=sg_dma_len(sg);
*mptr++ = sg_dma_address(sg);
- sg++;
+ /* Make this an end of list */
+ if (i == sg_count - 1)
+ mptr[-2] = direction|0xD0000000|sg_dma_len(sg);
}
- /* Make this an end of list */
- mptr[-2] = direction|0xD0000000|sg_dma_len(sg-1);
reqlen = mptr - msg;
*lenptr = len;
diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index 2d38025..9526fa9 100644
--- a/drivers/scsi/eata.c
+++ b/drivers/scsi/eata.c
@@ -1610,7 +1610,7 @@ static int eata2x_detect(struct scsi_host_template *tpnt)
static void map_dma(unsigned int i, struct hostdata *ha)
{
unsigned int k, count, pci_dir;
- struct scatterlist *sgpnt;
+ struct scatterlist *sgpnt, *sg;
struct mscp *cpp;
struct scsi_cmnd *SCpnt;
@@ -1646,9 +1646,9 @@ static void map_dma(unsigned int i, struct hostdata *ha)
sgpnt = (struct scatterlist *)SCpnt->request_buffer;
count = pci_map_sg(ha->pdev, sgpnt, SCpnt->use_sg, pci_dir);
- for (k = 0; k < count; k++) {
- cpp->sglist[k].address = H2DEV(sg_dma_address(&sgpnt[k]));
- cpp->sglist[k].num_bytes = H2DEV(sg_dma_len(&sgpnt[k]));
+ for_each_sg(sgpnt, sg, count, k) {
+ cpp->sglist[k].address = H2DEV(sg_dma_address(sg));
+ cpp->sglist[k].num_bytes = H2DEV(sg_dma_len(sg));
}
cpp->sg = 1;
diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c
index ec71061..4c29d29 100644
--- a/drivers/scsi/esp_scsi.c
+++ b/drivers/scsi/esp_scsi.c
@@ -325,6 +325,7 @@ static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd)
{
struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
struct scatterlist *sg = cmd->request_buffer;
+ struct scatterlist *s;
int dir = cmd->sc_data_direction;
int total, i;
@@ -339,8 +340,8 @@ static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd)
spriv->cur_sg = sg;
total = 0;
- for (i = 0; i < spriv->u.num_sg; i++)
- total += sg_dma_len(&sg[i]);
+ for_each_sg(sg, s, spriv->u.num_sg, i)
+ total += sg_dma_len(s);
spriv->tot_residue = total;
}
diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index 60446b8..3efc084 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -2656,7 +2656,7 @@ static void gdth_copy_internal_data(int hanum,Scsi_Cmnd *scp,
{
ushort cpcount,i;
ushort cpsum,cpnow;
- struct scatterlist *sl;
+ struct scatterlist *sl, *sg;
gdth_ha_str *ha;
char *address;
@@ -2665,29 +2665,30 @@ static void gdth_copy_internal_data(int hanum,Scsi_Cmnd *scp,
if (scp->use_sg) {
sl = (struct scatterlist *)scp->request_buffer;
- for (i=0,cpsum=0; i<scp->use_sg; ++i,++sl) {
+ cpsum = 0;
+ for_each_sg(sl, sg, scp->use_sg, i) {
unsigned long flags;
- cpnow = (ushort)sl->length;
+ cpnow = (ushort)sg->length;
TRACE(("copy_internal() now %d sum %d count %d %d\n",
cpnow,cpsum,cpcount,(ushort)scp->bufflen));
if (cpsum+cpnow > cpcount)
cpnow = cpcount - cpsum;
cpsum += cpnow;
- if (!sl->page) {
+ if (!sg->page) {
printk("GDT-HA %d: invalid sc/gt element in gdth_copy_internal_data()\n",
hanum);
return;
}
local_irq_save(flags);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
- address = kmap_atomic(sl->page, KM_BIO_SRC_IRQ) + sl->offset;
+ address = kmap_atomic(sg->page, KM_BIO_SRC_IRQ) + sg->offset;
memcpy(address,buffer,cpnow);
- flush_dcache_page(sl->page);
+ flush_dcache_page(sg->page);
kunmap_atomic(address, KM_BIO_SRC_IRQ);
#else
- address = kmap_atomic(sl->page, KM_BH_IRQ) + sl->offset;
+ address = kmap_atomic(sg->page, KM_BH_IRQ) + sg->offset;
memcpy(address,buffer,cpnow);
- flush_dcache_page(sl->page);
+ flush_dcache_page(sg->page);
kunmap_atomic(address, KM_BH_IRQ);
#endif
local_irq_restore(flags);
@@ -2807,7 +2808,7 @@ static int gdth_fill_cache_cmd(int hanum,Scsi_Cmnd *scp,ushort hdrive)
{
register gdth_ha_str *ha;
register gdth_cmd_str *cmdp;
- struct scatterlist *sl;
+ struct scatterlist *sl, *sg;
ulong32 cnt, blockcnt;
ulong64 no, blockno;
dma_addr_t phys_addr;
@@ -2913,25 +2914,25 @@ static int gdth_fill_cache_cmd(int hanum,Scsi_Cmnd *scp,ushort hdrive)
if (mode64) {
cmdp->u.cache64.DestAddr= (ulong64)-1;
cmdp->u.cache64.sg_canz = sgcnt;
- for (i=0; i<sgcnt; ++i,++sl) {
- cmdp->u.cache64.sg_lst[i].sg_ptr = sg_dma_address(sl);
+ for_each_sg(sl, sg, sgcnt, i) {
+ cmdp->u.cache64.sg_lst[i].sg_ptr = sg_dma_address(sg);
#ifdef GDTH_DMA_STATISTICS
if (cmdp->u.cache64.sg_lst[i].sg_ptr > (ulong64)0xffffffff)
ha->dma64_cnt++;
else
ha->dma32_cnt++;
#endif
- cmdp->u.cache64.sg_lst[i].sg_len = sg_dma_len(sl);
+ cmdp->u.cache64.sg_lst[i].sg_len = sg_dma_len(sg);
}
} else {
cmdp->u.cache.DestAddr= 0xffffffff;
cmdp->u.cache.sg_canz = sgcnt;
- for (i=0; i<sgcnt; ++i,++sl) {
- cmdp->u.cache.sg_lst[i].sg_ptr = sg_dma_address(sl);
+ for_each_sg(sl, sg, sgcnt, i) {
+ cmdp->u.cache.sg_lst[i].sg_ptr = sg_dma_address(sg);
#ifdef GDTH_DMA_STATISTICS
ha->dma32_cnt++;
#endif
- cmdp->u.cache.sg_lst[i].sg_len = sg_dma_len(sl);
+ cmdp->u.cache.sg_lst[i].sg_len = sg_dma_len(sg);
}
}
@@ -3017,7 +3018,7 @@ static int gdth_fill_raw_cmd(int hanum,Scsi_Cmnd *scp,unchar b)
{
register gdth_ha_str *ha;
register gdth_cmd_str *cmdp;
- struct scatterlist *sl;
+ struct scatterlist *sl, *sg;
ushort i;
dma_addr_t phys_addr, sense_paddr;
int cmd_index, sgcnt, mode64;
@@ -3120,25 +3121,25 @@ static int gdth_fill_raw_cmd(int hanum,Scsi_Cmnd *scp,unchar b)
if (mode64) {
cmdp->u.raw64.sdata = (ulong64)-1;
cmdp->u.raw64.sg_ranz = sgcnt;
- for (i=0; i<sgcnt; ++i,++sl) {
- cmdp->u.raw64.sg_lst[i].sg_ptr = sg_dma_address(sl);
+ for_each_sg(sl, sg, sgcnt, i) {
+ cmdp->u.raw64.sg_lst[i].sg_ptr = sg_dma_address(sg);
#ifdef GDTH_DMA_STATISTICS
if (cmdp->u.raw64.sg_lst[i].sg_ptr > (ulong64)0xffffffff)
ha->dma64_cnt++;
else
ha->dma32_cnt++;
#endif
- cmdp->u.raw64.sg_lst[i].sg_len = sg_dma_len(sl);
+ cmdp->u.raw64.sg_lst[i].sg_len = sg_dma_len(sg);
}
} else {
cmdp->u.raw.sdata = 0xffffffff;
cmdp->u.raw.sg_ranz = sgcnt;
- for (i=0; i<sgcnt; ++i,++sl) {
- cmdp->u.raw.sg_lst[i].sg_ptr = sg_dma_address(sl);
+ for_each_sg(sl, sg, sgcnt, i) {
+ cmdp->u.raw.sg_lst[i].sg_ptr = sg_dma_address(sg);
#ifdef GDTH_DMA_STATISTICS
ha->dma32_cnt++;
#endif
- cmdp->u.raw.sg_lst[i].sg_len = sg_dma_len(sl);
+ cmdp->u.raw.sg_lst[i].sg_len = sg_dma_len(sg);
}
}
diff --git a/drivers/scsi/hptiop.c b/drivers/scsi/hptiop.c
index bec83cb..5b1c210 100644
--- a/drivers/scsi/hptiop.c
+++ b/drivers/scsi/hptiop.c
@@ -449,6 +449,7 @@ static int hptiop_buildsgl(struct scsi_cmnd *scp, struct hpt_iopsg *psg)
struct Scsi_Host *host = scp->device->host;
struct hptiop_hba *hba = (struct hptiop_hba *)host->hostdata;
struct scatterlist *sglist = (struct scatterlist *)scp->request_buffer;
+ struct scatterlist *sg;
/*
* though we'll not get non-use_sg fields anymore,
@@ -463,10 +464,9 @@ static int hptiop_buildsgl(struct scsi_cmnd *scp, struct hpt_iopsg *psg)
HPT_SCP(scp)->mapped = 1;
BUG_ON(HPT_SCP(scp)->sgcnt > hba->max_sg_descriptors);
- for (idx = 0; idx < HPT_SCP(scp)->sgcnt; idx++) {
- psg[idx].pci_address =
- cpu_to_le64(sg_dma_address(&sglist[idx]));
- psg[idx].size = cpu_to_le32(sg_dma_len(&sglist[idx]));
+ for_each_sg(sglist, sg, HPT_SCP(scp)->sgcnt, idx) {
+ psg[idx].pci_address = cpu_to_le64(sg_dma_address(sg));
+ psg[idx].size = cpu_to_le32(sg_dma_len(sg));
psg[idx].eot = (idx == HPT_SCP(scp)->sgcnt - 1) ?
cpu_to_le32(1) : 0;
}
diff --git a/drivers/scsi/ibmmca.c b/drivers/scsi/ibmmca.c
index 0e57fb6..f6c2581 100644
--- a/drivers/scsi/ibmmca.c
+++ b/drivers/scsi/ibmmca.c
@@ -1808,7 +1808,7 @@ static int ibmmca_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
int host_index;
int max_pun;
int i;
- struct scatterlist *sl;
+ struct scatterlist *sl, *sg;
shpnt = cmd->device->host;
/* search for the right hostadapter */
@@ -1938,13 +1938,12 @@ static int ibmmca_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
scsi_cmd = cmd->cmnd[0];
if (cmd->use_sg) {
- i = cmd->use_sg;
sl = (struct scatterlist *) (cmd->request_buffer);
- if (i > 16)
+ if (cmd->use_sg > 16)
panic("IBM MCA SCSI: scatter-gather list too long.\n");
- while (--i >= 0) {
- ld(host_index)[ldn].sge[i].address = (void *) (isa_page_to_bus(sl[i].page) + sl[i].offset);
- ld(host_index)[ldn].sge[i].byte_length = sl[i].length;
+ for_each_sg(sl, sg, cmd->use_sg, i) {
+ ld(host_index)[ldn].sge[i].address = (void *) (isa_page_to_bus(sg->page) + sg->offset);
+ ld(host_index)[ldn].sge[i].byte_length = sg->length;
}
scb->enable |= IM_POINTER_TO_LIST;
scb->sys_buf_adr = isa_virt_to_bus(&(ld(host_index)[ldn].sge[0]));
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index b10eefe..943a01e 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -359,10 +359,10 @@ static int map_sg_list(int num_entries,
{
int i;
u64 total_length = 0;
+ struct scatterlist *sg_entry;
- for (i = 0; i < num_entries; ++i) {
+ for_each_sg(sg, sg_entry, num_entries, i) {
struct srp_direct_buf *descr = md + i;
- struct scatterlist *sg_entry = &sg[i];
descr->va = sg_dma_address(sg_entry);
descr->len = sg_dma_len(sg_entry);
descr->key = 0;
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 8263f75..9101928 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -70,6 +70,7 @@ typedef struct idescsi_pc_s {
u8 *buffer; /* Data buffer */
u8 *current_position; /* Pointer into the above buffer */
struct scatterlist *sg; /* Scatter gather table */
+ struct scatterlist *last_sg; /* Last sg element */
int b_count; /* Bytes transferred from current entry */
struct scsi_cmnd *scsi_cmd; /* SCSI command */
void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
@@ -175,11 +176,6 @@ static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigne
char *buf;
while (bcount) {
- if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
- printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
- idescsi_discard_data (drive, bcount);
- return;
- }
count = min(pc->sg->length - pc->b_count, bcount);
if (PageHighMem(pc->sg->page)) {
unsigned long flags;
@@ -198,10 +194,17 @@ static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigne
}
bcount -= count; pc->b_count += count;
if (pc->b_count == pc->sg->length) {
- pc->sg++;
+ if (pc->sg == pc->last_sg)
+ break;
+ pc->sg = sg_next(pc->sg);
pc->b_count = 0;
}
}
+
+ if (bcount) {
+ printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
+ idescsi_discard_data (drive, bcount);
+ }
}
static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
@@ -210,11 +213,6 @@ static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsign
char *buf;
while (bcount) {
- if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
- printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
- idescsi_output_zeros (drive, bcount);
- return;
- }
count = min(pc->sg->length - pc->b_count, bcount);
if (PageHighMem(pc->sg->page)) {
unsigned long flags;
@@ -233,10 +231,17 @@ static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsign
}
bcount -= count; pc->b_count += count;
if (pc->b_count == pc->sg->length) {
- pc->sg++;
+ if (pc->sg == pc->last_sg)
+ break;
+ pc->sg = sg_next(pc->sg);
pc->b_count = 0;
}
}
+
+ if (bcount) {
+ printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
+ idescsi_output_zeros (drive, bcount);
+ }
}
/*
@@ -910,9 +915,11 @@ static int idescsi_queue (struct scsi_cmnd *cmd,
if (cmd->use_sg) {
pc->buffer = NULL;
pc->sg = cmd->request_buffer;
+ pc->last_sg = sg_last(pc->sg, cmd->use_sg);
} else {
pc->buffer = cmd->request_buffer;
pc->sg = NULL;
+ pc->last_sg = NULL;
}
pc->b_count = 0;
pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
diff --git a/drivers/scsi/initio.c b/drivers/scsi/initio.c
index 7e7635c..300d33d 100644
--- a/drivers/scsi/initio.c
+++ b/drivers/scsi/initio.c
@@ -2882,7 +2882,7 @@ static int i91u_detect(struct scsi_host_template * tpnt)
static void i91uBuildSCB(HCS * pHCB, SCB * pSCB, struct scsi_cmnd * SCpnt)
{ /* Create corresponding SCB */
- struct scatterlist *pSrbSG;
+ struct scatterlist *pSrbSG, *sg;
SG *pSG; /* Pointer to SG list */
int i;
long TotalLen;
@@ -2926,10 +2926,12 @@ static void i91uBuildSCB(HCS * pHCB, SCB * pSCB, struct scsi_cmnd * SCpnt)
SCpnt->use_sg, SCpnt->sc_data_direction);
pSCB->SCB_Flags |= SCF_SG; /* Turn on SG list flag */
- for (i = 0, TotalLen = 0, pSG = &pSCB->SCB_SGList[0]; /* 1.01g */
- i < pSCB->SCB_SGLen; i++, pSG++, pSrbSG++) {
- pSG->SG_Ptr = cpu_to_le32((u32)sg_dma_address(pSrbSG));
- TotalLen += pSG->SG_Len = cpu_to_le32((u32)sg_dma_len(pSrbSG));
+ pSG = &pSCB->SCB_SGList[0];
+ TotalLen = 0;
+ for_each_sg(pSrbSG, sg, pSCB->SCB_SGLen, i) {
+ pSG->SG_Ptr = cpu_to_le32((u32)sg_dma_address(sg));
+ TotalLen += pSG->SG_Len = cpu_to_le32((u32)sg_dma_len(sg));
+ pSG++;
}
pSCB->SCB_BufLen = (SCpnt->request_bufflen > TotalLen) ?
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 4baa79e..01b0476 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -4286,7 +4286,7 @@ static int ipr_build_ioadl(struct ipr_ioa_cfg *ioa_cfg,
struct ipr_cmnd *ipr_cmd)
{
int i;
- struct scatterlist *sglist;
+ struct scatterlist *sglist, *sg;
u32 length;
u32 ioadl_flags = 0;
struct scsi_cmnd *scsi_cmd = ipr_cmd->scsi_cmd;
@@ -4327,11 +4327,10 @@ static int ipr_build_ioadl(struct ipr_ioa_cfg *ioa_cfg,
ioarcb->read_ioadl_addr = ioarcb->write_ioadl_addr;
}
- for (i = 0; i < ipr_cmd->dma_use_sg; i++) {
+ for_each_sg(sglist, sg, ipr_cmd->dma_use_sg, i) {
ioadl[i].flags_and_data_len =
- cpu_to_be32(ioadl_flags | sg_dma_len(&sglist[i]));
- ioadl[i].address =
- cpu_to_be32(sg_dma_address(&sglist[i]));
+ cpu_to_be32(ioadl_flags | sg_dma_len(sg));
+ ioadl[i].address = cpu_to_be32(sg_dma_address(sg));
}
if (likely(ipr_cmd->dma_use_sg)) {
diff --git a/drivers/scsi/ips.c b/drivers/scsi/ips.c
index 8b704f7..ba1957a 100644
--- a/drivers/scsi/ips.c
+++ b/drivers/scsi/ips.c
@@ -1687,10 +1687,11 @@ ips_make_passthru(ips_ha_t *ha, struct scsi_cmnd *SC, ips_scb_t *scb, int intr)
if (!SC->use_sg) {
length = SC->request_bufflen;
} else {
- struct scatterlist *sg = SC->request_buffer;
+ struct scatterlist *sgl = SC->request_buffer;
+ struct scatterlist *sg;
int i;
- for (i = 0; i < SC->use_sg; i++)
- length += sg[i].length;
+ for_each_sg(sgl, sg, SC->use_sg, i)
+ length += sg->length;
}
if (length < sizeof (ips_passthru_t)) {
/* wrong size */
@@ -2868,17 +2869,17 @@ ips_next(ips_ha_t * ha, int intr)
/* Now handle the data buffer */
if (SC->use_sg) {
- struct scatterlist *sg;
+ struct scatterlist *sg, *sgl;
int i;
- sg = SC->request_buffer;
- scb->sg_count = pci_map_sg(ha->pcidev, sg, SC->use_sg,
+ sgl = SC->request_buffer;
+ scb->sg_count = pci_map_sg(ha->pcidev, sgl, SC->use_sg,
SC->sc_data_direction);
scb->flags |= IPS_SCB_MAP_SG;
- for (i = 0; i < scb->sg_count; i++) {
+ for_each_sg(sgl, sg, scb->sg_count, i) {
if (ips_fill_scb_sg_single
- (ha, sg_dma_address(&sg[i]), scb, i,
- sg_dma_len(&sg[i])) < 0)
+ (ha, sg_dma_address(sg), scb, i,
+ sg_dma_len(sg)) < 0)
break;
}
scb->dcdb.transfer_length = scb->data_len;
@@ -3382,32 +3383,31 @@ ips_done(ips_ha_t * ha, ips_scb_t * scb)
if (scb->sg_count) {
/* S/G request */
- struct scatterlist *sg;
+ struct scatterlist *sg, *sgl;
int ips_sg_index = 0;
- int sg_dma_index;
+ int sg_dma_index, left, i;
- sg = scb->scsi_cmd->request_buffer;
+ sgl = scb->scsi_cmd->request_buffer;
/* Spin forward to last dma chunk */
sg_dma_index = scb->breakup;
+ sg = sg_last(sgl, sg_dma_index);
/* Take care of possible partial on last chunk */
ips_fill_scb_sg_single(ha,
- sg_dma_address(&sg
- [sg_dma_index]),
+ sg_dma_address(sg),
scb, ips_sg_index++,
- sg_dma_len(&sg
- [sg_dma_index]));
+ sg_dma_len(sg));
- for (; sg_dma_index < scb->sg_count;
- sg_dma_index++) {
+ sgl = sg;
+ left = scb->sg_count - sg_dma_index;
+ for_each_sg(sgl, sg, left, i) {
if (ips_fill_scb_sg_single
(ha,
- sg_dma_address(&sg[sg_dma_index]),
+ sg_dma_address(sg),
scb, ips_sg_index++,
- sg_dma_len(&sg[sg_dma_index])) < 0)
+ sg_dma_len(sg)) < 0)
break;
-
}
} else {
@@ -3659,17 +3659,21 @@ ips_scmd_buf_write(struct scsi_cmnd *scmd, void *data, unsigned int count)
char *cdata = (char *) data;
unsigned char *buffer;
unsigned long flags;
- struct scatterlist *sg = scmd->request_buffer;
- for (i = 0, xfer_cnt = 0;
- (i < scmd->use_sg) && (xfer_cnt < count); i++) {
- min_cnt = min(count - xfer_cnt, sg[i].length);
+ struct scatterlist *sgl = scmd->request_buffer;
+ struct scatterlist *sg;
+
+ xfer_cnt = 0;
+ for_each_sg(sgl, sg, scmd->use_sg, i) {
+ if (xfer_cnt >= count)
+ break;
+ min_cnt = min(count - xfer_cnt, sg->length);
/* kmap_atomic() ensures addressability of the data buffer.*/
/* local_irq_save() protects the KM_IRQ0 address slot. */
local_irq_save(flags);
- buffer = kmap_atomic(sg[i].page, KM_IRQ0) + sg[i].offset;
+ buffer = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
memcpy(buffer, &cdata[xfer_cnt], min_cnt);
- kunmap_atomic(buffer - sg[i].offset, KM_IRQ0);
+ kunmap_atomic(buffer - sg->offset, KM_IRQ0);
local_irq_restore(flags);
xfer_cnt += min_cnt;
@@ -3697,17 +3701,21 @@ ips_scmd_buf_read(struct scsi_cmnd *scmd, void *data, unsigned int count)
char *cdata = (char *) data;
unsigned char *buffer;
unsigned long flags;
- struct scatterlist *sg = scmd->request_buffer;
- for (i = 0, xfer_cnt = 0;
- (i < scmd->use_sg) && (xfer_cnt < count); i++) {
- min_cnt = min(count - xfer_cnt, sg[i].length);
+ struct scatterlist *sgl = scmd->request_buffer;
+ struct scatterlist *sg;
+
+ xfer_cnt = 0;
+ for_each_sg(sgl, sg, scmd->use_sg, i) {
+ if (xfer_cnt >= count)
+ break;
+ min_cnt = min(count - xfer_cnt, sg->length);
/* kmap_atomic() ensures addressability of the data buffer.*/
/* local_irq_save() protects the KM_IRQ0 address slot. */
local_irq_save(flags);
- buffer = kmap_atomic(sg[i].page, KM_IRQ0) + sg[i].offset;
+ buffer = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
memcpy(&cdata[xfer_cnt], buffer, min_cnt);
- kunmap_atomic(buffer - sg[i].offset, KM_IRQ0);
+ kunmap_atomic(buffer - sg->offset, KM_IRQ0);
local_irq_restore(flags);
xfer_cnt += min_cnt;
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index c9a3abf..8f709fa 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -310,10 +310,11 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
if (sc->use_sg) {
int i, sg_count = 0;
- struct scatterlist *sg = sc->request_buffer;
+ struct scatterlist *sgl = sc->request_buffer;
+ struct scatterlist *sg;
r2t->sg = NULL;
- for (i = 0; i < sc->use_sg; i++, sg += 1) {
+ for_each_sg(sgl, sg, sc->use_sg, i) {
/* FIXME: prefetch ? */
if (sg_count + sg->length > r2t->data_offset) {
int page_offset;
@@ -329,7 +330,7 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
r2t->sendbuf.sg.length -= page_offset;
/* xmit logic will continue with next one */
- r2t->sg = sg + 1;
+ r2t->sg = sg_next(sg);
break;
}
sg_count += sg->length;
@@ -702,7 +703,7 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn)
struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
struct scsi_cmnd *sc = ctask->sc;
- struct scatterlist *sg;
+ struct scatterlist *sg, *sgl;
int i, offset, rc = 0;
BUG_ON((void*)ctask != sc->SCp.ptr);
@@ -725,21 +726,21 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn)
}
offset = tcp_ctask->data_offset;
- sg = sc->request_buffer;
+ sgl = sc->request_buffer;
if (tcp_ctask->data_offset)
- for (i = 0; i < tcp_ctask->sg_count; i++)
- offset -= sg[i].length;
+ for_each_sg(sgl, sg, tcp_ctask->sg_count, i)
+ offset -= sg->length;
/* we've passed through partial sg*/
if (offset < 0)
offset = 0;
- for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
+ for_each_sg(sgl, sg, tcp_ctask->sg_count, i) {
char *dest;
- dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
- rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset,
- sg[i].length, offset);
+ dest = kmap_atomic(sg->page, KM_SOFTIRQ0);
+ rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg->offset,
+ sg->length, offset);
kunmap_atomic(dest, KM_SOFTIRQ0);
if (rc == -EAGAIN)
/* continue with the next SKB/PDU */
@@ -749,13 +750,13 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn)
if (!offset)
crypto_hash_update(
&tcp_conn->rx_hash,
- &sg[i], sg[i].length);
+ sg, sg->length);
else
partial_sg_digest_update(
&tcp_conn->rx_hash,
- &sg[i],
- sg[i].offset + offset,
- sg[i].length - offset);
+ sg,
+ sg->offset + offset,
+ sg->length - offset);
}
offset = 0;
tcp_ctask->sg_count++;
@@ -767,9 +768,9 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn)
* data-in is complete, but buffer not...
*/
partial_sg_digest_update(&tcp_conn->rx_hash,
- &sg[i],
- sg[i].offset,
- sg[i].length-rc);
+ sg,
+ sg->offset,
+ sg->length-rc);
rc = 0;
break;
}
@@ -1294,8 +1295,8 @@ iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
struct scatterlist *sg = sc->request_buffer;
iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
- tcp_ctask->sg = sg + 1;
- tcp_ctask->bad_sg = sg + sc->use_sg;
+ tcp_ctask->sg = sg_next(sg);
+ tcp_ctask->bad_sg = sg_last(sg, sc->use_sg);
} else {
iscsi_buf_init_iov(&tcp_ctask->sendbuf,
sc->request_buffer,
@@ -1522,7 +1523,7 @@ iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf,
buf_sent);
if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) {
iscsi_buf_init_sg(sendbuf, *sg);
- *sg = *sg + 1;
+ *sg = sg_next(*sg);
}
if (rc)
diff --git a/drivers/scsi/jazz_esp.c b/drivers/scsi/jazz_esp.c
index 19dd4b9..d742c73 100644
--- a/drivers/scsi/jazz_esp.c
+++ b/drivers/scsi/jazz_esp.c
@@ -15,6 +15,7 @@
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
+#include <linux/dma-mapping.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
@@ -240,12 +241,13 @@ static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
{
int sz = sp->SCp.buffers_residual;
- struct scatterlist *sg = (struct scatterlist *) sp->SCp.buffer;
-
- while (sz >= 0) {
- sg[sz].dma_address = vdma_alloc(CPHYSADDR(page_address(sg[sz].page) + sg[sz].offset), sg[sz].length);
- sz--;
- }
+ struct scatterlist *sgl = (struct scatterlist *) sp->SCp.buffer;
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sgl, sg, sz, i)
+ sg->dma_address = vdma_alloc(CPHYSADDR(page_address(sg->page) + sg->offset), sg->length);
+
sp->SCp.ptr=(char *)(sp->SCp.buffer->dma_address);
}
@@ -256,13 +258,12 @@ static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
{
- int sz = sp->use_sg - 1;
- struct scatterlist *sg = (struct scatterlist *)sp->request_buffer;
-
- while(sz >= 0) {
- vdma_free(sg[sz].dma_address);
- sz--;
- }
+ struct scatterlist *sgl = (struct scatterlist *)sp->request_buffer;
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sgl, sg, sp->use_sg, i)
+ vdma_free(sg->dma_address);
}
static void dma_advance_sg (struct scsi_cmnd *sp)
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 9a12d05..d1f6654 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -169,7 +169,7 @@ static int
lpfc_scsi_prep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd)
{
struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
- struct scatterlist *sgel = NULL;
+ struct scatterlist *sgel = NULL, *sg;
struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
@@ -214,18 +214,17 @@ lpfc_scsi_prep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd)
* single scsi command. Just run through the seg_cnt and format
* the bde's.
*/
- for (i = 0; i < lpfc_cmd->seg_cnt; i++) {
- physaddr = sg_dma_address(sgel);
+ for_each_sg(sgel, sg, lpfc_cmd->seg_cnt, i) {
+ physaddr = sg_dma_address(sg);
bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
- bpl->tus.f.bdeSize = sg_dma_len(sgel);
+ bpl->tus.f.bdeSize = sg_dma_len(sg);
if (datadir == DMA_TO_DEVICE)
bpl->tus.f.bdeFlags = 0;
else
bpl->tus.f.bdeFlags = BUFF_USE_RCV;
bpl->tus.w = le32_to_cpu(bpl->tus.w);
bpl++;
- sgel++;
num_bde++;
}
} else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
diff --git a/drivers/scsi/mac53c94.c b/drivers/scsi/mac53c94.c
index 5806ede..cb569c6 100644
--- a/drivers/scsi/mac53c94.c
+++ b/drivers/scsi/mac53c94.c
@@ -366,7 +366,7 @@ static void cmd_done(struct fsc_state *state, int result)
static void set_dma_cmds(struct fsc_state *state, struct scsi_cmnd *cmd)
{
int i, dma_cmd, total;
- struct scatterlist *scl;
+ struct scatterlist *scl, *sg;
struct dbdma_cmd *dcmds;
dma_addr_t dma_addr;
u32 dma_len;
@@ -381,9 +381,9 @@ static void set_dma_cmds(struct fsc_state *state, struct scsi_cmnd *cmd)
scl = (struct scatterlist *) cmd->request_buffer;
nseg = pci_map_sg(state->pdev, scl, cmd->use_sg,
cmd->sc_data_direction);
- for (i = 0; i < nseg; ++i) {
- dma_addr = sg_dma_address(scl);
- dma_len = sg_dma_len(scl);
+ for_each_sg(scl, sg, nseg, i) {
+ dma_addr = sg_dma_address(sg);
+ dma_len = sg_dma_len(sg);
if (dma_len > 0xffff)
panic("mac53c94: scatterlist element >= 64k");
total += dma_len;
@@ -391,7 +391,6 @@ static void set_dma_cmds(struct fsc_state *state, struct scsi_cmnd *cmd)
st_le16(&dcmds->command, dma_cmd);
st_le32(&dcmds->phy_addr, dma_addr);
dcmds->xfer_status = 0;
- ++scl;
++dcmds;
}
} else {
diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c
index 3cce75d..0ea9ef4 100644
--- a/drivers/scsi/megaraid.c
+++ b/drivers/scsi/megaraid.c
@@ -1767,7 +1767,7 @@ __mega_busywait_mbox (adapter_t *adapter)
static int
mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
{
- struct scatterlist *sgl;
+ struct scatterlist *sgl, *sg;
struct page *page;
unsigned long offset;
unsigned int length;
@@ -1832,15 +1832,14 @@ mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
*len = 0;
- for( idx = 0; idx < sgcnt; idx++, sgl++ ) {
-
+ for_each_sg(sgl, sg, sgcnt, idx) {
if( adapter->has_64bit_addr ) {
- scb->sgl64[idx].address = sg_dma_address(sgl);
- *len += scb->sgl64[idx].length = sg_dma_len(sgl);
+ scb->sgl64[idx].address = sg_dma_address(sg);
+ *len += scb->sgl64[idx].length = sg_dma_len(sg);
}
else {
- scb->sgl[idx].address = sg_dma_address(sgl);
- *len += scb->sgl[idx].length = sg_dma_len(sgl);
+ scb->sgl[idx].address = sg_dma_address(sg);
+ *len += scb->sgl[idx].length = sg_dma_len(sg);
}
}
diff --git a/drivers/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c
index 04d0b69..6b1ee7f 100644
--- a/drivers/scsi/megaraid/megaraid_mbox.c
+++ b/drivers/scsi/megaraid/megaraid_mbox.c
@@ -1377,6 +1377,7 @@ static int
megaraid_mbox_mksgl(adapter_t *adapter, scb_t *scb)
{
struct scatterlist *sgl;
+ struct scatterlist *sg;
mbox_ccb_t *ccb;
struct page *page;
unsigned long offset;
@@ -1429,9 +1430,9 @@ megaraid_mbox_mksgl(adapter_t *adapter, scb_t *scb)
scb->dma_type = MRAID_DMA_WSG;
- for (i = 0; i < sgcnt; i++, sgl++) {
- ccb->sgl64[i].address = sg_dma_address(sgl);
- ccb->sgl64[i].length = sg_dma_len(sgl);
+ for_each_sg(sgl, sg, sgcnt, i) {
+ ccb->sgl64[i].address = sg_dma_address(sg);
+ ccb->sgl64[i].length = sg_dma_len(sg);
}
// Return count of SG nodes
diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 7a81267..5260bc6 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -431,7 +431,7 @@ megasas_make_sgl32(struct megasas_instance *instance, struct scsi_cmnd *scp,
{
int i;
int sge_count;
- struct scatterlist *os_sgl;
+ struct scatterlist *os_sgl, *sg;
/*
* Return 0 if there is no data transfer
@@ -456,9 +456,9 @@ megasas_make_sgl32(struct megasas_instance *instance, struct scsi_cmnd *scp,
sge_count = pci_map_sg(instance->pdev, os_sgl, scp->use_sg,
scp->sc_data_direction);
- for (i = 0; i < sge_count; i++, os_sgl++) {
- mfi_sgl->sge32[i].length = sg_dma_len(os_sgl);
- mfi_sgl->sge32[i].phys_addr = sg_dma_address(os_sgl);
+ for_each_sg(os_sgl, sg, sge_count, i) {
+ mfi_sgl->sge32[i].length = sg_dma_len(sg);
+ mfi_sgl->sge32[i].phys_addr = sg_dma_address(sg);
}
return sge_count;
@@ -479,7 +479,7 @@ megasas_make_sgl64(struct megasas_instance *instance, struct scsi_cmnd *scp,
{
int i;
int sge_count;
- struct scatterlist *os_sgl;
+ struct scatterlist *os_sgl, *sg;
/*
* Return 0 if there is no data transfer
@@ -505,9 +505,9 @@ megasas_make_sgl64(struct megasas_instance *instance, struct scsi_cmnd *scp,
sge_count = pci_map_sg(instance->pdev, os_sgl, scp->use_sg,
scp->sc_data_direction);
- for (i = 0; i < sge_count; i++, os_sgl++) {
- mfi_sgl->sge64[i].length = sg_dma_len(os_sgl);
- mfi_sgl->sge64[i].phys_addr = sg_dma_address(os_sgl);
+ for_each_sg(os_sgl, sg, sge_count, i) {
+ mfi_sgl->sge64[i].length = sg_dma_len(sg);
+ mfi_sgl->sge64[i].phys_addr = sg_dma_address(sg);
}
return sge_count;
diff --git a/drivers/scsi/mesh.c b/drivers/scsi/mesh.c
index e64d1a1..66519aa 100644
--- a/drivers/scsi/mesh.c
+++ b/drivers/scsi/mesh.c
@@ -1257,7 +1257,7 @@ static void handle_msgin(struct mesh_state *ms)
static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd)
{
int i, dma_cmd, total, off, dtot;
- struct scatterlist *scl;
+ struct scatterlist *scl, *sg;
struct dbdma_cmd *dcmds;
dma_cmd = ms->tgts[ms->conn_tgt].data_goes_out?
@@ -1267,17 +1267,17 @@ static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd)
if (cmd) {
cmd->SCp.this_residual = cmd->request_bufflen;
if (cmd->use_sg > 0) {
- int nseg;
+ int nseg, i;
total = 0;
scl = (struct scatterlist *) cmd->request_buffer;
off = ms->data_ptr;
nseg = pci_map_sg(ms->pdev, scl, cmd->use_sg,
cmd->sc_data_direction);
- for (i = 0; i <nseg; ++i, ++scl) {
- u32 dma_addr = sg_dma_address(scl);
- u32 dma_len = sg_dma_len(scl);
+ for_each_sg(scl, sg, nseg, i) {
+ u32 dma_addr = sg_dma_address(sg);
+ u32 dma_len = sg_dma_len(sg);
- total += scl->length;
+ total += sg->length;
if (off >= dma_len) {
off -= dma_len;
continue;
diff --git a/drivers/scsi/ncr53c8xx.c b/drivers/scsi/ncr53c8xx.c
index bbf521c..e6210c6 100644
--- a/drivers/scsi/ncr53c8xx.c
+++ b/drivers/scsi/ncr53c8xx.c
@@ -7700,6 +7700,7 @@ static int ncr_scatter(struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd)
segment = ncr_scatter_no_sglist(np, cp, cmd);
else if ((use_sg = map_scsi_sg_data(np, cmd)) > 0) {
struct scatterlist *scatter = (struct scatterlist *)cmd->request_buffer;
+ struct scatterlist *sg;
struct scr_tblmove *data;
if (use_sg > MAX_SCATTER) {
@@ -7709,9 +7710,9 @@ static int ncr_scatter(struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd)
data = &cp->phys.data[MAX_SCATTER - use_sg];
- for (segment = 0; segment < use_sg; segment++) {
- dma_addr_t baddr = sg_dma_address(&scatter[segment]);
- unsigned int len = sg_dma_len(&scatter[segment]);
+ for_each_sg(scatter, sg, use_sg, segment) {
+ dma_addr_t baddr = sg_dma_address(sg);
+ unsigned int len = sg_dma_len(sg);
ncr_build_sge(np, &data[segment], baddr, len);
cp->data_len += len;
diff --git a/drivers/scsi/nsp32.c b/drivers/scsi/nsp32.c
index f6f561d..32426a9 100644
--- a/drivers/scsi/nsp32.c
+++ b/drivers/scsi/nsp32.c
@@ -888,7 +888,7 @@ static int nsp32_reselection(struct scsi_cmnd *SCpnt, unsigned char newlun)
static int nsp32_setup_sg_table(struct scsi_cmnd *SCpnt)
{
nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
- struct scatterlist *sgl;
+ struct scatterlist *sgl, *sg;
nsp32_sgtable *sgt = data->cur_lunt->sglun->sgt;
int num, i;
u32_le l;
@@ -906,13 +906,12 @@ static int nsp32_setup_sg_table(struct scsi_cmnd *SCpnt)
sgl = (struct scatterlist *)SCpnt->request_buffer;
num = pci_map_sg(data->Pci, sgl, SCpnt->use_sg,
SCpnt->sc_data_direction);
- for (i = 0; i < num; i++) {
+ for_each_sg(sgl, sg, num, i) {
/*
* Build nsp32_sglist, substitute sg dma addresses.
*/
- sgt[i].addr = cpu_to_le32(sg_dma_address(sgl));
- sgt[i].len = cpu_to_le32(sg_dma_len(sgl));
- sgl++;
+ sgt[i].addr = cpu_to_le32(sg_dma_address(sg));
+ sgt[i].len = cpu_to_le32(sg_dma_len(sg));
if (le32_to_cpu(sgt[i].len) > 0x10000) {
nsp32_msg(KERN_ERR,
diff --git a/drivers/scsi/pcmcia/sym53c500_cs.c b/drivers/scsi/pcmcia/sym53c500_cs.c
index ffe75c4..b1e9270 100644
--- a/drivers/scsi/pcmcia/sym53c500_cs.c
+++ b/drivers/scsi/pcmcia/sym53c500_cs.c
@@ -442,12 +442,13 @@ SYM53C500_intr(int irq, void *dev_id)
if (!curSC->use_sg) /* Don't use scatter-gather */
SYM53C500_pio_write(fast_pio, port_base, curSC->request_buffer, curSC->request_bufflen);
else { /* use scatter-gather */
+ struct scatterlist *sg;
+ int i;
+
sgcount = curSC->use_sg;
sglist = curSC->request_buffer;
- while (sgcount--) {
- SYM53C500_pio_write(fast_pio, port_base, page_address(sglist->page) + sglist->offset, sglist->length);
- sglist++;
- }
+ for_each_sg(sglist, sg, sgcount, i)
+ SYM53C500_pio_write(fast_pio, port_base, page_address(sg->page) + sg->offset, sg->length);
}
REG0(port_base);
}
@@ -463,12 +464,13 @@ SYM53C500_intr(int irq, void *dev_id)
if (!curSC->use_sg) /* Don't use scatter-gather */
SYM53C500_pio_read(fast_pio, port_base, curSC->request_buffer, curSC->request_bufflen);
else { /* Use scatter-gather */
+ struct scatterlist *sg;
+ int i;
+
sgcount = curSC->use_sg;
sglist = curSC->request_buffer;
- while (sgcount--) {
- SYM53C500_pio_read(fast_pio, port_base, page_address(sglist->page) + sglist->offset, sglist->length);
- sglist++;
- }
+ for_each_sg(sglist, sg, sgcount, i)
+ SYM53C500_pio_read(fast_pio, port_base, page_address(sg->page) + sg->offset, sg->length);
}
REG0(port_base);
}
diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 54d8bdf..bd805ec 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -2775,7 +2775,7 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
struct device_reg __iomem *reg = ha->iobase;
struct scsi_cmnd *cmd = sp->cmd;
cmd_a64_entry_t *pkt;
- struct scatterlist *sg = NULL;
+ struct scatterlist *sg = NULL, *s;
__le32 *dword_ptr;
dma_addr_t dma_handle;
int status = 0;
@@ -2889,13 +2889,16 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
* Load data segments.
*/
if (seg_cnt) { /* If data transfer. */
+ int remseg = seg_cnt;
/* Setup packet address segment pointer. */
dword_ptr = (u32 *)&pkt->dseg_0_address;
if (cmd->use_sg) { /* If scatter gather */
/* Load command entry data segments. */
- for (cnt = 0; cnt < 2 && seg_cnt; cnt++, seg_cnt--) {
- dma_handle = sg_dma_address(sg);
+ for_each_sg(sg, s, seg_cnt, cnt) {
+ if (cnt == 2)
+ break;
+ dma_handle = sg_dma_address(s);
#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
if (ha->flags.use_pci_vchannel)
sn_pci_set_vchan(ha->pdev,
@@ -2906,12 +2909,12 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
cpu_to_le32(pci_dma_lo32(dma_handle));
*dword_ptr++ =
cpu_to_le32(pci_dma_hi32(dma_handle));
- *dword_ptr++ = cpu_to_le32(sg_dma_len(sg));
- sg++;
+ *dword_ptr++ = cpu_to_le32(sg_dma_len(s));
dprintk(3, "S/G Segment phys_addr=%x %x, len=0x%x\n",
cpu_to_le32(pci_dma_hi32(dma_handle)),
cpu_to_le32(pci_dma_lo32(dma_handle)),
- cpu_to_le32(sg_dma_len(sg)));
+ cpu_to_le32(sg_dma_len(sg_next(s))));
+ remseg--;
}
dprintk(5, "qla1280_64bit_start_scsi: Scatter/gather "
"command packet data - b %i, t %i, l %i \n",
@@ -2926,7 +2929,9 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
dprintk(3, "S/G Building Continuation...seg_cnt=0x%x "
"remains\n", seg_cnt);
- while (seg_cnt > 0) {
+ while (remseg > 0) {
+ /* Update sg start */
+ sg = s;
/* Adjust ring index. */
ha->req_ring_index++;
if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
@@ -2952,9 +2957,10 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
(u32 *)&((struct cont_a64_entry *) pkt)->dseg_0_address;
/* Load continuation entry data segments. */
- for (cnt = 0; cnt < 5 && seg_cnt;
- cnt++, seg_cnt--) {
- dma_handle = sg_dma_address(sg);
+ for_each_sg(sg, s, remseg, cnt) {
+ if (cnt == 5)
+ break;
+ dma_handle = sg_dma_address(s);
#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
if (ha->flags.use_pci_vchannel)
sn_pci_set_vchan(ha->pdev,
@@ -2966,12 +2972,12 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
*dword_ptr++ =
cpu_to_le32(pci_dma_hi32(dma_handle));
*dword_ptr++ =
- cpu_to_le32(sg_dma_len(sg));
+ cpu_to_le32(sg_dma_len(s));
dprintk(3, "S/G Segment Cont. phys_addr=%x %x, len=0x%x\n",
cpu_to_le32(pci_dma_hi32(dma_handle)),
cpu_to_le32(pci_dma_lo32(dma_handle)),
- cpu_to_le32(sg_dma_len(sg)));
- sg++;
+ cpu_to_le32(sg_dma_len(s)));
+ remseg--;
}
dprintk(5, "qla1280_64bit_start_scsi: "
"continuation packet data - b %i, t "
@@ -3062,7 +3068,7 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
struct device_reg __iomem *reg = ha->iobase;
struct scsi_cmnd *cmd = sp->cmd;
struct cmd_entry *pkt;
- struct scatterlist *sg = NULL;
+ struct scatterlist *sg = NULL, *s;
__le32 *dword_ptr;
int status = 0;
int cnt;
@@ -3188,6 +3194,7 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
* Load data segments.
*/
if (seg_cnt) {
+ int remseg = seg_cnt;
/* Setup packet address segment pointer. */
dword_ptr = &pkt->dseg_0_address;
@@ -3196,22 +3203,25 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
qla1280_dump_buffer(1, (char *)sg, 4 * 16);
/* Load command entry data segments. */
- for (cnt = 0; cnt < 4 && seg_cnt; cnt++, seg_cnt--) {
+ for_each_sg(sg, s, seg_cnt, cnt) {
+ if (cnt == 4)
+ break;
*dword_ptr++ =
- cpu_to_le32(pci_dma_lo32(sg_dma_address(sg)));
- *dword_ptr++ =
- cpu_to_le32(sg_dma_len(sg));
+ cpu_to_le32(pci_dma_lo32(sg_dma_address(s)));
+ *dword_ptr++ = cpu_to_le32(sg_dma_len(s));
dprintk(3, "S/G Segment phys_addr=0x%lx, len=0x%x\n",
- (pci_dma_lo32(sg_dma_address(sg))),
- (sg_dma_len(sg)));
- sg++;
+ (pci_dma_lo32(sg_dma_address(s))),
+ (sg_dma_len(s)));
+ remseg--;
}
/*
* Build continuation packets.
*/
dprintk(3, "S/G Building Continuation"
"...seg_cnt=0x%x remains\n", seg_cnt);
- while (seg_cnt > 0) {
+ while (remseg > 0) {
+ /* Continue from end point */
+ sg = s;
/* Adjust ring index. */
ha->req_ring_index++;
if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
@@ -3239,18 +3249,16 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
&((struct cont_entry *) pkt)->dseg_0_address;
/* Load continuation entry data segments. */
- for (cnt = 0; cnt < 7 && seg_cnt;
- cnt++, seg_cnt--) {
+ for_each_sg(sg, s, remseg, cnt) {
*dword_ptr++ =
- cpu_to_le32(pci_dma_lo32(sg_dma_address(sg)));
+ cpu_to_le32(pci_dma_lo32(sg_dma_address(s)));
*dword_ptr++ =
- cpu_to_le32(sg_dma_len(sg));
+ cpu_to_le32(sg_dma_len(s));
dprintk(1,
"S/G Segment Cont. phys_addr=0x%x, "
"len=0x%x\n",
- cpu_to_le32(pci_dma_lo32(sg_dma_address(sg))),
- cpu_to_le32(sg_dma_len(sg)));
- sg++;
+ cpu_to_le32(pci_dma_lo32(sg_dma_address(s))),
+ cpu_to_le32(sg_dma_len(s)));
}
dprintk(5, "qla1280_32bit_start_scsi: "
"continuation packet data - "
diff --git a/drivers/scsi/qla2xxx/qla_iocb.c b/drivers/scsi/qla2xxx/qla_iocb.c
index c5b3c61..10251bf 100644
--- a/drivers/scsi/qla2xxx/qla_iocb.c
+++ b/drivers/scsi/qla2xxx/qla_iocb.c
@@ -671,12 +671,11 @@ qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
/* Load data segments */
if (cmd->use_sg != 0) {
+ struct scatterlist *sgl = cmd->request_buffer;
struct scatterlist *cur_seg;
- struct scatterlist *end_seg;
+ int i;
- cur_seg = (struct scatterlist *)cmd->request_buffer;
- end_seg = cur_seg + tot_dsds;
- while (cur_seg < end_seg) {
+ for_each_sg(sgl, cur_seg, tot_dsds, i) {
dma_addr_t sle_dma;
cont_a64_entry_t *cont_pkt;
@@ -696,8 +695,6 @@ qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
*cur_dsd++ = cpu_to_le32(MSD(sle_dma));
*cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
avail_dsds--;
-
- cur_seg++;
}
} else {
*cur_dsd++ = cpu_to_le32(LSD(sp->dma_handle));
diff --git a/drivers/scsi/qla4xxx/ql4_iocb.c b/drivers/scsi/qla4xxx/ql4_iocb.c
index a216a17..82a894b 100644
--- a/drivers/scsi/qla4xxx/ql4_iocb.c
+++ b/drivers/scsi/qla4xxx/ql4_iocb.c
@@ -156,12 +156,11 @@ static void qla4xxx_build_scsi_iocbs(struct srb *srb,
/* Load data segments */
if (cmd->use_sg) {
+ struct scatterlist *sgl = cmd->request_buffer;
struct scatterlist *cur_seg;
- struct scatterlist *end_seg;
+ int i;
- cur_seg = (struct scatterlist *)cmd->request_buffer;
- end_seg = cur_seg + tot_dsds;
- while (cur_seg < end_seg) {
+ for_each_sg(sgl, cur_seg, tot_dsds, i) {
dma_addr_t sle_dma;
/* Allocate additional continuation packets? */
@@ -182,7 +181,6 @@ static void qla4xxx_build_scsi_iocbs(struct srb *srb,
avail_dsds--;
cur_dsd++;
- cur_seg++;
}
} else {
cur_dsd->base.addrLow = cpu_to_le32(LSDW(srb->dma_handle));
diff --git a/drivers/scsi/qlogicfas408.c b/drivers/scsi/qlogicfas408.c
index 2e7db18..ccc7d3f 100644
--- a/drivers/scsi/qlogicfas408.c
+++ b/drivers/scsi/qlogicfas408.c
@@ -315,18 +315,19 @@ static unsigned int ql_pcmd(struct scsi_cmnd *cmd)
ql_pdma(priv, phase, cmd->request_buffer,
cmd->request_bufflen);
else {
+ struct scatterlist *sg;
+
sgcount = cmd->use_sg;
sglist = cmd->request_buffer;
- while (sgcount--) {
+ for_each_sg(sglist, sg, sgcount, i) {
if (priv->qabort) {
REG0;
return ((priv->qabort == 1 ?
DID_ABORT : DID_RESET) << 16);
}
- buf = page_address(sglist->page) + sglist->offset;
- if (ql_pdma(priv, phase, buf, sglist->length))
+ buf = page_address(sg->page) + sg->offset;
+ if (ql_pdma(priv, phase, buf, sg->length))
break;
- sglist++;
}
}
REG0;
diff --git a/drivers/scsi/qlogicpti.c b/drivers/scsi/qlogicpti.c
index c4195ea..e36e6cd 100644
--- a/drivers/scsi/qlogicpti.c
+++ b/drivers/scsi/qlogicpti.c
@@ -868,7 +868,7 @@ static inline int load_cmd(struct scsi_cmnd *Cmnd, struct Command_Entry *cmd,
struct qlogicpti *qpti, u_int in_ptr, u_int out_ptr)
{
struct dataseg *ds;
- struct scatterlist *sg;
+ struct scatterlist *sg, *s;
int i, n;
if (Cmnd->use_sg) {
@@ -884,11 +884,12 @@ static inline int load_cmd(struct scsi_cmnd *Cmnd, struct Command_Entry *cmd,
n = sg_count;
if (n > 4)
n = 4;
- for (i = 0; i < n; i++, sg++) {
- ds[i].d_base = sg_dma_address(sg);
- ds[i].d_count = sg_dma_len(sg);
+ for_each_sg(sg, s, n, i) {
+ ds[i].d_base = sg_dma_address(s);
+ ds[i].d_count = sg_dma_len(g);
}
sg_count -= 4;
+ sg = s;
while (sg_count > 0) {
struct Continuation_Entry *cont;
@@ -907,9 +908,9 @@ static inline int load_cmd(struct scsi_cmnd *Cmnd, struct Command_Entry *cmd,
n = sg_count;
if (n > 7)
n = 7;
- for (i = 0; i < n; i++, sg++) {
- ds[i].d_base = sg_dma_address(sg);
- ds[i].d_count = sg_dma_len(sg);
+ for_each_sg(sg, s, n, i) {
+ ds[i].d_base = sg_dma_address(s);
+ ds[i].d_count = sg_dma_len(s);
}
sg_count -= n;
}
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 06229f2..0ef1310 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -38,6 +38,7 @@
#include <linux/proc_fs.h>
#include <linux/vmalloc.h>
#include <linux/moduleparam.h>
+#include <linux/scatterlist.h>
#include <linux/blkdev.h>
#include "scsi.h"
@@ -600,7 +601,7 @@ static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
int k, req_len, act_len, len, active;
void * kaddr;
void * kaddr_off;
- struct scatterlist * sgpnt;
+ struct scatterlist * sgpnt, * sg;
if (0 == scp->request_bufflen)
return 0;
@@ -621,14 +622,15 @@ static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
}
sgpnt = (struct scatterlist *)scp->request_buffer;
active = 1;
- for (k = 0, req_len = 0, act_len = 0; k < scp->use_sg; ++k, ++sgpnt) {
+ req_len = act_len = 0;
+ for_each_sg(sgpnt, sg, scp->use_sg, k) {
if (active) {
kaddr = (unsigned char *)
- kmap_atomic(sgpnt->page, KM_USER0);
+ kmap_atomic(sg->page, KM_USER0);
if (NULL == kaddr)
return (DID_ERROR << 16);
- kaddr_off = (unsigned char *)kaddr + sgpnt->offset;
- len = sgpnt->length;
+ kaddr_off = (unsigned char *)kaddr + sg->offset;
+ len = sg->length;
if ((req_len + len) > arr_len) {
active = 0;
len = arr_len - req_len;
@@ -637,7 +639,7 @@ static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
kunmap_atomic(kaddr, KM_USER0);
act_len += len;
}
- req_len += sgpnt->length;
+ req_len += sg->length;
}
if (scp->resid)
scp->resid -= act_len;
@@ -653,7 +655,7 @@ static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
int k, req_len, len, fin;
void * kaddr;
void * kaddr_off;
- struct scatterlist * sgpnt;
+ struct scatterlist * sg;
if (0 == scp->request_bufflen)
return 0;
@@ -668,13 +670,14 @@ static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
memcpy(arr, scp->request_buffer, len);
return len;
}
- sgpnt = (struct scatterlist *)scp->request_buffer;
- for (k = 0, req_len = 0, fin = 0; k < scp->use_sg; ++k, ++sgpnt) {
- kaddr = (unsigned char *)kmap_atomic(sgpnt->page, KM_USER0);
+ sg = (struct scatterlist *)scp->request_buffer;
+ req_len = fin = 0;
+ for (k = 0; k < scp->use_sg; ++k, sg = sg_next(sg)) {
+ kaddr = (unsigned char *)kmap_atomic(sg->page, KM_USER0);
if (NULL == kaddr)
return -1;
- kaddr_off = (unsigned char *)kaddr + sgpnt->offset;
- len = sgpnt->length;
+ kaddr_off = (unsigned char *)kaddr + sg->offset;
+ len = sg->length;
if ((req_len + len) > max_arr_len) {
len = max_arr_len - req_len;
fin = 1;
@@ -683,7 +686,7 @@ static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
kunmap_atomic(kaddr, KM_USER0);
if (fin)
return req_len + len;
- req_len += sgpnt->length;
+ req_len += sg->length;
}
return req_len;
}
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 0c691a6..0d67fa2 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1168,7 +1168,7 @@ sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
sg = rsv_schp->buffer;
sa = vma->vm_start;
for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
- ++k, ++sg) {
+ ++k, sg = sg_next(sg)) {
len = vma->vm_end - sa;
len = (len < sg->length) ? len : sg->length;
if (offset < len) {
@@ -1212,7 +1212,7 @@ sg_mmap(struct file *filp, struct vm_area_struct *vma)
sa = vma->vm_start;
sg = rsv_schp->buffer;
for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
- ++k, ++sg) {
+ ++k, sg = sg_next(sg)) {
len = vma->vm_end - sa;
len = (len < sg->length) ? len : sg->length;
sa += len;
@@ -1866,7 +1866,7 @@ sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
}
for (k = 0, sg = schp->buffer, rem_sz = blk_size;
(rem_sz > 0) && (k < mx_sc_elems);
- ++k, rem_sz -= ret_sz, ++sg) {
+ ++k, rem_sz -= ret_sz, sg = sg_next(sg)) {
num = (rem_sz > scatter_elem_sz_prev) ?
scatter_elem_sz_prev : rem_sz;
@@ -1939,7 +1939,7 @@ sg_write_xfer(Sg_request * srp)
if (res)
return res;
- for (; p; ++sg, ksglen = sg->length,
+ for (; p; sg = sg_next(sg), ksglen = sg->length,
p = page_address(sg->page)) {
if (usglen <= 0)
break;
@@ -2018,7 +2018,7 @@ sg_remove_scat(Sg_scatter_hold * schp)
int k;
for (k = 0; (k < schp->k_use_sg) && sg->page;
- ++k, ++sg) {
+ ++k, sg = sg_next(sg)) {
SCSI_LOG_TIMEOUT(5, printk(
"sg_remove_scat: k=%d, pg=0x%p, len=%d\n",
k, sg->page, sg->length));
@@ -2071,7 +2071,7 @@ sg_read_xfer(Sg_request * srp)
if (res)
return res;
- for (; p; ++sg, ksglen = sg->length,
+ for (; p; sg = sg_next(sg), ksglen = sg->length,
p = page_address(sg->page)) {
if (usglen <= 0)
break;
@@ -2118,7 +2118,7 @@ sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
if ((!outp) || (num_read_xfer <= 0))
return 0;
- for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, ++sg) {
+ for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, sg = sg_next(sg)) {
num = sg->length;
if (num > num_read_xfer) {
if (__copy_to_user(outp, page_address(sg->page),
@@ -2168,7 +2168,7 @@ sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
rem = size;
- for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) {
+ for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) {
num = sg->length;
if (rem <= num) {
sfp->save_scat_len = num;
diff --git a/drivers/scsi/sym53c416.c b/drivers/scsi/sym53c416.c
index 2ca9505..06c765c 100644
--- a/drivers/scsi/sym53c416.c
+++ b/drivers/scsi/sym53c416.c
@@ -332,7 +332,7 @@ static irqreturn_t sym53c416_intr_handle(int irq, void *dev_id)
int i;
unsigned long flags = 0;
unsigned char status_reg, pio_int_reg, int_reg;
- struct scatterlist *sglist;
+ struct scatterlist *sglist, *sg;
unsigned int sgcount;
unsigned int tot_trans = 0;
@@ -437,11 +437,8 @@ static irqreturn_t sym53c416_intr_handle(int irq, void *dev_id)
{
sgcount = current_command->use_sg;
sglist = current_command->request_buffer;
- while(sgcount--)
- {
- tot_trans += sym53c416_write(base, SG_ADDRESS(sglist), sglist->length);
- sglist++;
- }
+ for_each_sg(sglist, sg, sgcount, i)
+ tot_trans += sym53c416_write(base, SG_ADDRESS(sg), sg->length);
}
if(tot_trans < current_command->underflow)
printk(KERN_WARNING "sym53c416: Underflow, wrote %d bytes, request for %d bytes.\n", tot_trans, current_command->underflow);
diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c
index 4d78c7e..f39e3ec 100644
--- a/drivers/scsi/sym53c8xx_2/sym_glue.c
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.c
@@ -371,6 +371,7 @@ static int sym_scatter(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd
segment = sym_scatter_no_sglist(np, cp, cmd);
else if ((use_sg = map_scsi_sg_data(np, cmd)) > 0) {
struct scatterlist *scatter = (struct scatterlist *)cmd->request_buffer;
+ struct scatterlist *sg;
struct sym_tcb *tp = &np->target[cp->target];
struct sym_tblmove *data;
@@ -381,9 +382,9 @@ static int sym_scatter(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd
data = &cp->phys.data[SYM_CONF_MAX_SG - use_sg];
- for (segment = 0; segment < use_sg; segment++) {
- dma_addr_t baddr = sg_dma_address(&scatter[segment]);
- unsigned int len = sg_dma_len(&scatter[segment]);
+ for_each_sg(scatter, sg, use_sg, segment) {
+ dma_addr_t baddr = sg_dma_address(sg);
+ unsigned int len = sg_dma_len(sg);
if ((len & 1) && (tp->head.wval & EWS)) {
len++;
diff --git a/drivers/scsi/u14-34f.c b/drivers/scsi/u14-34f.c
index 3de08a1..db17ba4 100644
--- a/drivers/scsi/u14-34f.c
+++ b/drivers/scsi/u14-34f.c
@@ -1111,7 +1111,7 @@ static int u14_34f_detect(struct scsi_host_template *tpnt) {
static void map_dma(unsigned int i, unsigned int j) {
unsigned int data_len = 0;
unsigned int k, count, pci_dir;
- struct scatterlist *sgpnt;
+ struct scatterlist *sgpnt, *sg;
struct mscp *cpp;
struct scsi_cmnd *SCpnt;
@@ -1140,10 +1140,10 @@ static void map_dma(unsigned int i, unsigned int j) {
sgpnt = (struct scatterlist *) SCpnt->request_buffer;
count = pci_map_sg(HD(j)->pdev, sgpnt, SCpnt->use_sg, pci_dir);
- for (k = 0; k < count; k++) {
- cpp->sglist[k].address = H2DEV(sg_dma_address(&sgpnt[k]));
- cpp->sglist[k].num_bytes = H2DEV(sg_dma_len(&sgpnt[k]));
- data_len += sgpnt[k].length;
+ for_each_sg(sgpnt, sg, count, k) {
+ cpp->sglist[k].address = H2DEV(sg_dma_address(sg));
+ cpp->sglist[k].num_bytes = H2DEV(sg_dma_len(sg));
+ data_len += sg->length;
}
cpp->sg = TRUE;
diff --git a/drivers/scsi/ultrastor.c b/drivers/scsi/ultrastor.c
index 56906ab..1b721ec 100644
--- a/drivers/scsi/ultrastor.c
+++ b/drivers/scsi/ultrastor.c
@@ -675,16 +675,16 @@ static const char *ultrastor_info(struct Scsi_Host * shpnt)
static inline void build_sg_list(struct mscp *mscp, struct scsi_cmnd *SCpnt)
{
- struct scatterlist *sl;
+ struct scatterlist *sl, *sg;
long transfer_length = 0;
int i, max;
sl = (struct scatterlist *) SCpnt->request_buffer;
max = SCpnt->use_sg;
- for (i = 0; i < max; i++) {
- mscp->sglist[i].address = isa_page_to_bus(sl[i].page) + sl[i].offset;
- mscp->sglist[i].num_bytes = sl[i].length;
- transfer_length += sl[i].length;
+ for_each_sg(sl, sg, max, i) {
+ mscp->sglist[i].address = isa_page_to_bus(sg->page) + sg->offset;
+ mscp->sglist[i].num_bytes = sg->length;
+ transfer_length += sg->length;
}
mscp->number_of_sg_list = max;
mscp->transfer_data = isa_virt_to_bus(mscp->sglist);
diff --git a/drivers/scsi/wd7000.c b/drivers/scsi/wd7000.c
index 30be765..85aaa5e 100644
--- a/drivers/scsi/wd7000.c
+++ b/drivers/scsi/wd7000.c
@@ -1108,6 +1108,7 @@ static int wd7000_queuecommand(struct scsi_cmnd *SCpnt,
if (SCpnt->use_sg) {
struct scatterlist *sg = (struct scatterlist *) SCpnt->request_buffer;
+ struct scatterlist *s;
unsigned i;
if (SCpnt->device->host->sg_tablesize == SG_NONE) {
@@ -1120,9 +1121,9 @@ static int wd7000_queuecommand(struct scsi_cmnd *SCpnt,
any2scsi(scb->dataptr, (int) sgb);
any2scsi(scb->maxlen, SCpnt->use_sg * sizeof(Sgb));
- for (i = 0; i < SCpnt->use_sg; i++) {
- any2scsi(sgb[i].ptr, isa_page_to_bus(sg[i].page) + sg[i].offset);
- any2scsi(sgb[i].len, sg[i].length);
+ for_each_sg(sg, s, SCpnt->use_sg, i) {
+ any2scsi(sgb[i].ptr, isa_page_to_bus(s->page) + s->offset);
+ any2scsi(sgb[i].len, s->length);
}
} else {
scb->op = 0;
diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
index 4d3cbb1..8d3711a 100644
--- a/drivers/usb/storage/alauda.c
+++ b/drivers/usb/storage/alauda.c
@@ -798,12 +798,13 @@ static int alauda_read_data(struct us_data *us, unsigned long address,
{
unsigned char *buffer;
u16 lba, max_lba;
- unsigned int page, len, index, offset;
+ unsigned int page, len, offset;
unsigned int blockshift = MEDIA_INFO(us).blockshift;
unsigned int pageshift = MEDIA_INFO(us).pageshift;
unsigned int blocksize = MEDIA_INFO(us).blocksize;
unsigned int pagesize = MEDIA_INFO(us).pagesize;
unsigned int uzonesize = MEDIA_INFO(us).uzonesize;
+ struct scatterlist *sg;
int result;
/*
@@ -827,7 +828,8 @@ static int alauda_read_data(struct us_data *us, unsigned long address,
max_lba = MEDIA_INFO(us).capacity >> (blockshift + pageshift);
result = USB_STOR_TRANSPORT_GOOD;
- index = offset = 0;
+ offset = 0;
+ sg = NULL;
while (sectors > 0) {
unsigned int zone = lba / uzonesize; /* integer division */
@@ -873,7 +875,7 @@ static int alauda_read_data(struct us_data *us, unsigned long address,
/* Store the data in the transfer buffer */
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &index, &offset, TO_XFER_BUF);
+ &sg, &offset, TO_XFER_BUF);
page = 0;
lba++;
@@ -891,11 +893,12 @@ static int alauda_write_data(struct us_data *us, unsigned long address,
unsigned int sectors)
{
unsigned char *buffer, *blockbuffer;
- unsigned int page, len, index, offset;
+ unsigned int page, len, offset;
unsigned int blockshift = MEDIA_INFO(us).blockshift;
unsigned int pageshift = MEDIA_INFO(us).pageshift;
unsigned int blocksize = MEDIA_INFO(us).blocksize;
unsigned int pagesize = MEDIA_INFO(us).pagesize;
+ struct scatterlist *sg;
u16 lba, max_lba;
int result;
@@ -929,7 +932,8 @@ static int alauda_write_data(struct us_data *us, unsigned long address,
max_lba = MEDIA_INFO(us).capacity >> (pageshift + blockshift);
result = USB_STOR_TRANSPORT_GOOD;
- index = offset = 0;
+ offset = 0;
+ sg = NULL;
while (sectors > 0) {
/* Write as many sectors as possible in this block */
@@ -946,7 +950,7 @@ static int alauda_write_data(struct us_data *us, unsigned long address,
/* Get the data from the transfer buffer */
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &index, &offset, FROM_XFER_BUF);
+ &sg, &offset, FROM_XFER_BUF);
result = alauda_write_lba(us, lba, page, pages, buffer,
blockbuffer);
diff --git a/drivers/usb/storage/datafab.c b/drivers/usb/storage/datafab.c
index c87ad1b..579e9f5 100644
--- a/drivers/usb/storage/datafab.c
+++ b/drivers/usb/storage/datafab.c
@@ -98,7 +98,8 @@ static int datafab_read_data(struct us_data *us,
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;
// we're working in LBA mode. according to the ATA spec,
// we can support up to 28-bit addressing. I don't know if Datafab
@@ -155,7 +156,7 @@ static int datafab_read_data(struct us_data *us,
// Store the data in the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, TO_XFER_BUF);
+ &sg, &sg_offset, TO_XFER_BUF);
sector += thistime;
totallen -= len;
@@ -181,7 +182,8 @@ static int datafab_write_data(struct us_data *us,
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;
// we're working in LBA mode. according to the ATA spec,
// we can support up to 28-bit addressing. I don't know if Datafab
@@ -217,7 +219,7 @@ static int datafab_write_data(struct us_data *us,
// Get the data from the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, FROM_XFER_BUF);
+ &sg, &sg_offset, FROM_XFER_BUF);
command[0] = 0;
command[1] = thistime;
diff --git a/drivers/usb/storage/jumpshot.c b/drivers/usb/storage/jumpshot.c
index 003fcf5..61097cb 100644
--- a/drivers/usb/storage/jumpshot.c
+++ b/drivers/usb/storage/jumpshot.c
@@ -119,7 +119,8 @@ static int jumpshot_read_data(struct us_data *us,
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;
// we're working in LBA mode. according to the ATA spec,
// we can support up to 28-bit addressing. I don't know if Jumpshot
@@ -170,7 +171,7 @@ static int jumpshot_read_data(struct us_data *us,
// Store the data in the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, TO_XFER_BUF);
+ &sg, &sg_offset, TO_XFER_BUF);
sector += thistime;
totallen -= len;
@@ -195,7 +196,8 @@ static int jumpshot_write_data(struct us_data *us,
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result, waitcount;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;
// we're working in LBA mode. according to the ATA spec,
// we can support up to 28-bit addressing. I don't know if Jumpshot
@@ -225,7 +227,7 @@ static int jumpshot_write_data(struct us_data *us,
// Get the data from the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, FROM_XFER_BUF);
+ &sg, &sg_offset, FROM_XFER_BUF);
command[0] = 0;
command[1] = thistime;
diff --git a/drivers/usb/storage/protocol.c b/drivers/usb/storage/protocol.c
index 9ad3042..cc8f7c5 100644
--- a/drivers/usb/storage/protocol.c
+++ b/drivers/usb/storage/protocol.c
@@ -157,7 +157,7 @@ void usb_stor_transparent_scsi_command(struct scsi_cmnd *srb,
* pick up from where this one left off. */
unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
- unsigned int buflen, struct scsi_cmnd *srb, unsigned int *index,
+ unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **sgptr,
unsigned int *offset, enum xfer_buf_dir dir)
{
unsigned int cnt;
@@ -184,16 +184,17 @@ unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
* located in high memory -- then kmap() will map it to a temporary
* position in the kernel's virtual address space. */
} else {
- struct scatterlist *sg =
- (struct scatterlist *) srb->request_buffer
- + *index;
+ struct scatterlist *sg = *sgptr;
+
+ if (!sg)
+ sg = (struct scatterlist *) srb->request_buffer;
/* This loop handles a single s-g list entry, which may
* include multiple pages. Find the initial page structure
* and the starting offset within the page, and update
* the *offset and *index values for the next loop. */
cnt = 0;
- while (cnt < buflen && *index < srb->use_sg) {
+ while (cnt < buflen) {
struct page *page = sg->page +
((sg->offset + *offset) >> PAGE_SHIFT);
unsigned int poff =
@@ -209,8 +210,7 @@ unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
/* Transfer continues to next s-g entry */
*offset = 0;
- ++*index;
- ++sg;
+ sg = sg_next(sg);
}
/* Transfer the data for all the pages in this
@@ -234,6 +234,7 @@ unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
sglen -= plen;
}
}
+ *sgptr = sg;
}
/* Return the amount actually transferred */
@@ -245,9 +246,10 @@ unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
void usb_stor_set_xfer_buf(unsigned char *buffer,
unsigned int buflen, struct scsi_cmnd *srb)
{
- unsigned int index = 0, offset = 0;
+ unsigned int offset = 0;
+ struct scatterlist *sg = NULL;
- usb_stor_access_xfer_buf(buffer, buflen, srb, &index, &offset,
+ usb_stor_access_xfer_buf(buffer, buflen, srb, &sg, &offset,
TO_XFER_BUF);
if (buflen < srb->request_bufflen)
srb->resid = srb->request_bufflen - buflen;
diff --git a/drivers/usb/storage/protocol.h b/drivers/usb/storage/protocol.h
index 845bed4..8737a36 100644
--- a/drivers/usb/storage/protocol.h
+++ b/drivers/usb/storage/protocol.h
@@ -52,7 +52,7 @@ extern void usb_stor_transparent_scsi_command(struct scsi_cmnd*,
enum xfer_buf_dir {TO_XFER_BUF, FROM_XFER_BUF};
extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
- unsigned int buflen, struct scsi_cmnd *srb, unsigned int *index,
+ unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **,
unsigned int *offset, enum xfer_buf_dir dir);
extern void usb_stor_set_xfer_buf(unsigned char *buffer,
diff --git a/drivers/usb/storage/sddr09.c b/drivers/usb/storage/sddr09.c
index b2ed2a3..b12202c 100644
--- a/drivers/usb/storage/sddr09.c
+++ b/drivers/usb/storage/sddr09.c
@@ -705,7 +705,8 @@ sddr09_read_data(struct us_data *us,
unsigned char *buffer;
unsigned int lba, maxlba, pba;
unsigned int page, pages;
- unsigned int len, index, offset;
+ unsigned int len, offset;
+ struct scatterlist *sg;
int result;
// Figure out the initial LBA and page
@@ -730,7 +731,8 @@ sddr09_read_data(struct us_data *us,
// contiguous LBA's. Another exercise left to the student.
result = 0;
- index = offset = 0;
+ offset = 0;
+ sg = NULL;
while (sectors > 0) {
@@ -777,7 +779,7 @@ sddr09_read_data(struct us_data *us,
// Store the data in the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &index, &offset, TO_XFER_BUF);
+ &sg, &offset, TO_XFER_BUF);
page = 0;
lba++;
@@ -931,7 +933,8 @@ sddr09_write_data(struct us_data *us,
unsigned int pagelen, blocklen;
unsigned char *blockbuffer;
unsigned char *buffer;
- unsigned int len, index, offset;
+ unsigned int len, offset;
+ struct scatterlist *sg;
int result;
// Figure out the initial LBA and page
@@ -968,7 +971,8 @@ sddr09_write_data(struct us_data *us,
}
result = 0;
- index = offset = 0;
+ offset = 0;
+ sg = NULL;
while (sectors > 0) {
@@ -987,7 +991,7 @@ sddr09_write_data(struct us_data *us,
// Get the data from the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &index, &offset, FROM_XFER_BUF);
+ &sg, &offset, FROM_XFER_BUF);
result = sddr09_write_lba(us, lba, page, pages,
buffer, blockbuffer);
diff --git a/drivers/usb/storage/sddr55.c b/drivers/usb/storage/sddr55.c
index 0b1b5b5..d43a341 100644
--- a/drivers/usb/storage/sddr55.c
+++ b/drivers/usb/storage/sddr55.c
@@ -167,7 +167,8 @@ static int sddr55_read_data(struct us_data *us,
unsigned long address;
unsigned short pages;
- unsigned int len, index, offset;
+ unsigned int len, offset;
+ struct scatterlist *sg;
// Since we only read in one block at a time, we have to create
// a bounce buffer and move the data a piece at a time between the
@@ -178,7 +179,8 @@ static int sddr55_read_data(struct us_data *us,
buffer = kmalloc(len, GFP_NOIO);
if (buffer == NULL)
return USB_STOR_TRANSPORT_ERROR; /* out of memory */
- index = offset = 0;
+ offset = 0;
+ sg = NULL;
while (sectors>0) {
@@ -255,7 +257,7 @@ static int sddr55_read_data(struct us_data *us,
// Store the data in the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &index, &offset, TO_XFER_BUF);
+ &sg, &offset, TO_XFER_BUF);
page = 0;
lba++;
@@ -287,7 +289,8 @@ static int sddr55_write_data(struct us_data *us,
unsigned short pages;
int i;
- unsigned int len, index, offset;
+ unsigned int len, offset;
+ struct scatterlist *sg;
/* check if we are allowed to write */
if (info->read_only || info->force_read_only) {
@@ -304,7 +307,8 @@ static int sddr55_write_data(struct us_data *us,
buffer = kmalloc(len, GFP_NOIO);
if (buffer == NULL)
return USB_STOR_TRANSPORT_ERROR;
- index = offset = 0;
+ offset = 0;
+ sg = NULL;
while (sectors > 0) {
@@ -322,7 +326,7 @@ static int sddr55_write_data(struct us_data *us,
// Get the data from the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &index, &offset, FROM_XFER_BUF);
+ &sg, &offset, FROM_XFER_BUF);
US_DEBUGP("Write %02X pages, to PBA %04X"
" (LBA %04X) page %02X\n",
diff --git a/drivers/usb/storage/shuttle_usbat.c b/drivers/usb/storage/shuttle_usbat.c
index 5e27297..a0ff394 100644
--- a/drivers/usb/storage/shuttle_usbat.c
+++ b/drivers/usb/storage/shuttle_usbat.c
@@ -996,7 +996,8 @@ static int usbat_flash_read_data(struct us_data *us,
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;
result = usbat_flash_check_media(us, info);
if (result != USB_STOR_TRANSPORT_GOOD)
@@ -1050,7 +1051,7 @@ static int usbat_flash_read_data(struct us_data *us,
/* Store the data in the transfer buffer */
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, TO_XFER_BUF);
+ &sg, &sg_offset, TO_XFER_BUF);
sector += thistime;
totallen -= len;
@@ -1086,7 +1087,8 @@ static int usbat_flash_write_data(struct us_data *us,
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;
result = usbat_flash_check_media(us, info);
if (result != USB_STOR_TRANSPORT_GOOD)
@@ -1125,7 +1127,7 @@ static int usbat_flash_write_data(struct us_data *us,
/* Get the data from the transfer buffer */
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, FROM_XFER_BUF);
+ &sg, &sg_offset, FROM_XFER_BUF);
/* ATA command 0x30 (WRITE SECTORS) */
usbat_pack_ata_sector_cmd(command, thistime, sector, 0x30);
@@ -1165,8 +1167,8 @@ static int usbat_hp8200e_handle_read10(struct us_data *us,
unsigned char *buffer;
unsigned int len;
unsigned int sector;
- unsigned int sg_segment = 0;
unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;
US_DEBUGP("handle_read10: transfersize %d\n",
srb->transfersize);
@@ -1223,9 +1225,6 @@ static int usbat_hp8200e_handle_read10(struct us_data *us,
sector |= short_pack(data[7+5], data[7+4]);
transferred = 0;
- sg_segment = 0; /* for keeping track of where we are in */
- sg_offset = 0; /* the scatter/gather list */
-
while (transferred != srb->request_bufflen) {
if (len > srb->request_bufflen - transferred)
@@ -1258,7 +1257,7 @@ static int usbat_hp8200e_handle_read10(struct us_data *us,
/* Store the data in the transfer buffer */
usb_stor_access_xfer_buf(buffer, len, srb,
- &sg_segment, &sg_offset, TO_XFER_BUF);
+ &sg, &sg_offset, TO_XFER_BUF);
/* Update the amount transferred and the sector number */
diff --git a/include/linux/i2o.h b/include/linux/i2o.h
index 52f53e2..0ae1dcf 100644
--- a/include/linux/i2o.h
+++ b/include/linux/i2o.h
@@ -836,7 +836,7 @@ static inline int i2o_dma_map_sg(struct i2o_controller *c,
if ((sizeof(dma_addr_t) > 4) && c->pae_support)
*mptr++ = cpu_to_le32(i2o_dma_high(sg_dma_address(sg)));
#endif
- sg++;
+ sg = sg_next(sg);
}
*sg_ptr = mptr;
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 07aba87..fe81b05 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -764,7 +764,7 @@ typedef struct hwif_s {
unsigned int nsect;
unsigned int nleft;
- unsigned int cursg;
+ struct scatterlist *cursg;
unsigned int cursg_ofs;
int rqsize; /* max sectors per request */
On Wed, 16 May 2007 10:32:19 +0200,
Jens Axboe <[email protected]> wrote:
> This converts the SCSI mid layer to using the sg helpers for looking up
> sg elements, instead of doing it manually.
>
> Signed-off-by: Jens Axboe <[email protected]>
> ---
> drivers/scsi/scsi_lib.c | 20 +++++++++++---------
> 1 files changed, 11 insertions(+), 9 deletions(-)
This needs to include linux/scatterlist.h (other architectures seem to
pull this header in via other routes, but e.g. s390 doesn't).
---
drivers/scsi/scsi_lib.c | 1 +
1 files changed, 1 insertion(+)
--- linux.orig/drivers/scsi/scsi_lib.c
+++ linux/drivers/scsi/scsi_lib.c
@@ -17,6 +17,7 @@
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hardirq.h>
+#include <linux/scatterlist.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
On Wed, May 16 2007, Cornelia Huck wrote:
> On Wed, 16 May 2007 10:32:19 +0200,
> Jens Axboe <[email protected]> wrote:
>
> > This converts the SCSI mid layer to using the sg helpers for looking up
> > sg elements, instead of doing it manually.
> >
> > Signed-off-by: Jens Axboe <[email protected]>
> > ---
> > drivers/scsi/scsi_lib.c | 20 +++++++++++---------
> > 1 files changed, 11 insertions(+), 9 deletions(-)
>
> This needs to include linux/scatterlist.h (other architectures seem to
> pull this header in via other routes, but e.g. s390 doesn't).
>
> ---
> drivers/scsi/scsi_lib.c | 1 +
> 1 files changed, 1 insertion(+)
>
> --- linux.orig/drivers/scsi/scsi_lib.c
> +++ linux/drivers/scsi/scsi_lib.c
> @@ -17,6 +17,7 @@
> #include <linux/pci.h>
> #include <linux/delay.h>
> #include <linux/hardirq.h>
> +#include <linux/scatterlist.h>
>
> #include <scsi/scsi.h>
> #include <scsi/scsi_cmnd.h>
Patch 17 does that, so the end result should work. But I'll move it to
patch 5, that is the correct spot to do it. Thanks!
--
Jens Axboe