Here are a few more dmaengine cleanups targeted for 2.6.29. The bulk of the
change is fixing the dmaengine sysfs implementation.
It has been pushed out to the 'upstream' tree of async_tx.git[1] and will move
to -next shortly.
---
Dan Williams (4):
dmaengine: bump initcall level to arch_initcall
dmaengine: advertise all channels on a device to dma_filter_fn
dmaengine: use idr for registering dma device numbers
dmaengine: add a release for dma class devices and dependent infrastructure
drivers/dca/dca-core.c | 2 -
drivers/dma/dmaengine.c | 169 ++++++++++++++++++++++++++++++++-------------
drivers/dma/dmatest.c | 14 ++--
drivers/dma/dw_dmac.c | 91 +++++++++++++-----------
drivers/dma/fsldma.c | 2 -
include/linux/dmaengine.h | 23 +++++-
6 files changed, 201 insertions(+), 100 deletions(-)
--
[1] git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx.git upstream
This brings some predictability to dma device numbers, i.e. an rmmod/insmod
cycle may now result in /sys/class/dma/dma0chan0 being restored rather than
/sys/class/dma/dma1chan0 appearing.
Cc: Maciej Sosnowski <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
---
drivers/dma/dmaengine.c | 26 ++++++++++++++++++++++++--
include/linux/dmaengine.h | 4 ++++
2 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index fead043..4b7ffb7 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -57,10 +57,12 @@
#include <linux/mutex.h>
#include <linux/jiffies.h>
#include <linux/rculist.h>
+#include <linux/idr.h>
static DEFINE_MUTEX(dma_list_mutex);
static LIST_HEAD(dma_device_list);
static long dmaengine_ref_count;
+static struct idr dma_idr;
/* --- sysfs implementation --- */
@@ -147,6 +149,11 @@ static void chan_dev_release(struct device *dev)
struct dma_chan_dev *chan_dev;
chan_dev = container_of(dev, typeof(*chan_dev), device);
+ if (atomic_dec_and_test(chan_dev->idr_ref)) {
+ mutex_lock(&dma_list_mutex);
+ idr_remove(&dma_idr, chan_dev->dev_id);
+ mutex_unlock(&dma_list_mutex);
+ }
kfree(chan_dev);
}
@@ -604,9 +611,9 @@ EXPORT_SYMBOL(dmaengine_put);
*/
int dma_async_device_register(struct dma_device *device)
{
- static int id;
int chancnt = 0, rc;
struct dma_chan* chan;
+ atomic_t *idr_ref;
if (!device)
return -ENODEV;
@@ -633,9 +640,20 @@ int dma_async_device_register(struct dma_device *device)
BUG_ON(!device->device_issue_pending);
BUG_ON(!device->dev);
+ idr_ref = kmalloc(sizeof(*idr_ref), GFP_KERNEL);
+ if (!idr_ref)
+ return -ENOMEM;
+ atomic_set(idr_ref, 0);
+ idr_retry:
+ if (!idr_pre_get(&dma_idr, GFP_KERNEL))
+ return -ENOMEM;
mutex_lock(&dma_list_mutex);
- device->dev_id = id++;
+ rc = idr_get_new(&dma_idr, NULL, &device->dev_id);
mutex_unlock(&dma_list_mutex);
+ if (rc == -EAGAIN)
+ goto idr_retry;
+ else if (rc != 0)
+ return rc;
/* represent channels in sysfs. Probably want devs too */
list_for_each_entry(chan, &device->channels, device_node) {
@@ -652,6 +670,9 @@ int dma_async_device_register(struct dma_device *device)
chan->dev->device.class = &dma_devclass;
chan->dev->device.parent = device->dev;
chan->dev->chan = chan;
+ chan->dev->idr_ref = idr_ref;
+ chan->dev->dev_id = device->dev_id;
+ atomic_inc(idr_ref);
dev_set_name(&chan->dev->device, "dma%dchan%d",
device->dev_id, chan->chan_id);
@@ -964,6 +985,7 @@ EXPORT_SYMBOL_GPL(dma_run_dependencies);
static int __init dma_bus_init(void)
{
+ idr_init(&dma_idr);
mutex_init(&dma_list_mutex);
return class_register(&dma_devclass);
}
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index d6b6bff..64dea2a 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -140,10 +140,14 @@ struct dma_chan {
* struct dma_chan_dev - relate sysfs device node to backing channel device
* @chan - driver channel device
* @device - sysfs device
+ * @dev_id - parent dma_device dev_id
+ * @idr_ref - reference count to gate release of dma_device dev_id
*/
struct dma_chan_dev {
struct dma_chan *chan;
struct device device;
+ int dev_id;
+ atomic_t *idr_ref;
};
static inline const char *dma_chan_name(struct dma_chan *chan)
There are dmaengine users that would like to register dma devices at
subsys_initcall time to ensure channels are available by device_initcall
time.
Cc: Maciej Sosnowski <[email protected]>
Cc: Guennadi Liakhovetski <[email protected]>
Cc: Nicolas Ferre <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
---
drivers/dca/dca-core.c | 2 +-
drivers/dma/dmaengine.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/dca/dca-core.c b/drivers/dca/dca-core.c
index d883e1b..5543384 100644
--- a/drivers/dca/dca-core.c
+++ b/drivers/dca/dca-core.c
@@ -270,6 +270,6 @@ static void __exit dca_exit(void)
dca_sysfs_exit();
}
-subsys_initcall(dca_init);
+arch_initcall(dca_init);
module_exit(dca_exit);
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index f4a640d..5289224 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -316,7 +316,7 @@ static int __init dma_channel_table_init(void)
return err;
}
-subsys_initcall(dma_channel_table_init);
+arch_initcall(dma_channel_table_init);
/**
* dma_find_channel - find a channel to carry out the operation
@@ -982,6 +982,6 @@ static int __init dma_bus_init(void)
mutex_init(&dma_list_mutex);
return class_register(&dma_devclass);
}
-subsys_initcall(dma_bus_init);
+arch_initcall(dma_bus_init);
Allow dma_filter_fn routines to disambiguate multiple channels on a device
rather than assuming that all channels on a device are equal.
Cc: Maciej Sosnowski <[email protected]>
Reported-by: Guennadi Liakhovetski <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
---
drivers/dma/dmaengine.c | 33 +++++++++++++--------------------
1 files changed, 13 insertions(+), 20 deletions(-)
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 4b7ffb7..f4a640d 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -452,10 +452,10 @@ static void dma_channel_rebalance(void)
}
}
-static struct dma_chan *private_candidate(dma_cap_mask_t *mask, struct dma_device *dev)
+static struct dma_chan *private_candidate(dma_cap_mask_t *mask, struct dma_device *dev,
+ dma_filter_fn fn, void *fn_param)
{
struct dma_chan *chan;
- struct dma_chan *ret = NULL;
/* devices with multiple channels need special handling as we need to
* ensure that all channels are either private or public.
@@ -478,11 +478,15 @@ static struct dma_chan *private_candidate(dma_cap_mask_t *mask, struct dma_devic
__func__, dma_chan_name(chan));
continue;
}
- ret = chan;
- break;
+ if (fn && !fn(chan, fn_param)) {
+ pr_debug("%s: %s filter said false\n",
+ __func__, dma_chan_name(chan));
+ continue;
+ }
+ return chan;
}
- return ret;
+ return NULL;
}
/**
@@ -495,22 +499,13 @@ struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, v
{
struct dma_device *device, *_d;
struct dma_chan *chan = NULL;
- bool ack;
int err;
/* Find a channel */
mutex_lock(&dma_list_mutex);
list_for_each_entry_safe(device, _d, &dma_device_list, global_node) {
- chan = private_candidate(mask, device);
- if (!chan)
- continue;
-
- if (fn)
- ack = fn(chan, fn_param);
- else
- ack = true;
-
- if (ack) {
+ chan = private_candidate(mask, device, fn, fn_param);
+ if (chan) {
/* Found a suitable channel, try to grab, prep, and
* return it. We first set DMA_PRIVATE to disable
* balance_ref_count as this channel will not be
@@ -528,10 +523,8 @@ struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, v
dma_chan_name(chan), err);
else
break;
- } else
- pr_debug("%s: %s filter said false\n",
- __func__, dma_chan_name(chan));
- chan = NULL;
+ chan = NULL;
+ }
}
mutex_unlock(&dma_list_mutex);
Resolves:
WARNING: at drivers/base/core.c:122 device_release+0x4d/0x52()
Device 'dma0chan0' does not have a release() function, it is broken and must be fixed.
The dma_chan_dev object is introduced to gear-match sysfs kobject and
dmaengine channel lifetimes. When a channel is removed access to the
sysfs entries return -ENODEV until the kobject can be released.
The bulk of the change is updates to existing code to handle the extra
layer of indirection between a dma_chan and its struct device.
Reported-by: Alexander Beregalov <[email protected]>
Cc: Stephen Hemminger <[email protected]>
Cc: Haavard Skinnemoen <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
---
drivers/dma/dmaengine.c | 108 +++++++++++++++++++++++++++++++++++----------
drivers/dma/dmatest.c | 14 +++---
drivers/dma/dw_dmac.c | 91 +++++++++++++++++++++-----------------
drivers/dma/fsldma.c | 2 -
include/linux/dmaengine.h | 19 +++++++-
5 files changed, 158 insertions(+), 76 deletions(-)
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index dcf1a83..fead043 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -64,36 +64,75 @@ static long dmaengine_ref_count;
/* --- sysfs implementation --- */
+/**
+ * dev_to_dma_chan - convert a device pointer to the its sysfs container object
+ * @dev - device node
+ *
+ * Must be called under dma_list_mutex
+ */
+static struct dma_chan *dev_to_dma_chan(struct device *dev)
+{
+ struct dma_chan_dev *chan_dev;
+
+ chan_dev = container_of(dev, typeof(*chan_dev), device);
+ return chan_dev->chan;
+}
+
static ssize_t show_memcpy_count(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct dma_chan *chan = to_dma_chan(dev);
+ struct dma_chan *chan;
unsigned long count = 0;
int i;
+ int err;
- for_each_possible_cpu(i)
- count += per_cpu_ptr(chan->local, i)->memcpy_count;
+ mutex_lock(&dma_list_mutex);
+ chan = dev_to_dma_chan(dev);
+ if (chan) {
+ for_each_possible_cpu(i)
+ count += per_cpu_ptr(chan->local, i)->memcpy_count;
+ err = sprintf(buf, "%lu\n", count);
+ } else
+ err = -ENODEV;
+ mutex_unlock(&dma_list_mutex);
- return sprintf(buf, "%lu\n", count);
+ return err;
}
static ssize_t show_bytes_transferred(struct device *dev, struct device_attribute *attr,
char *buf)
{
- struct dma_chan *chan = to_dma_chan(dev);
+ struct dma_chan *chan;
unsigned long count = 0;
int i;
+ int err;
- for_each_possible_cpu(i)
- count += per_cpu_ptr(chan->local, i)->bytes_transferred;
+ mutex_lock(&dma_list_mutex);
+ chan = dev_to_dma_chan(dev);
+ if (chan) {
+ for_each_possible_cpu(i)
+ count += per_cpu_ptr(chan->local, i)->bytes_transferred;
+ err = sprintf(buf, "%lu\n", count);
+ } else
+ err = -ENODEV;
+ mutex_unlock(&dma_list_mutex);
- return sprintf(buf, "%lu\n", count);
+ return err;
}
static ssize_t show_in_use(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct dma_chan *chan = to_dma_chan(dev);
+ struct dma_chan *chan;
+ int err;
- return sprintf(buf, "%d\n", chan->client_count);
+ mutex_lock(&dma_list_mutex);
+ chan = dev_to_dma_chan(dev);
+ if (chan)
+ err = sprintf(buf, "%d\n", chan->client_count);
+ else
+ err = -ENODEV;
+ mutex_unlock(&dma_list_mutex);
+
+ return err;
}
static struct device_attribute dma_attrs[] = {
@@ -103,9 +142,18 @@ static struct device_attribute dma_attrs[] = {
__ATTR_NULL
};
+static void chan_dev_release(struct device *dev)
+{
+ struct dma_chan_dev *chan_dev;
+
+ chan_dev = container_of(dev, typeof(*chan_dev), device);
+ kfree(chan_dev);
+}
+
static struct class dma_devclass = {
.name = "dma",
.dev_attrs = dma_attrs,
+ .dev_release = chan_dev_release,
};
/* --- client and device registration --- */
@@ -415,12 +463,12 @@ static struct dma_chan *private_candidate(dma_cap_mask_t *mask, struct dma_devic
list_for_each_entry(chan, &dev->channels, device_node) {
if (!__dma_chan_satisfies_mask(chan, mask)) {
pr_debug("%s: %s wrong capabilities\n",
- __func__, dev_name(&chan->dev));
+ __func__, dma_chan_name(chan));
continue;
}
if (chan->client_count) {
pr_debug("%s: %s busy\n",
- __func__, dev_name(&chan->dev));
+ __func__, dma_chan_name(chan));
continue;
}
ret = chan;
@@ -466,22 +514,22 @@ struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, v
if (err == -ENODEV) {
pr_debug("%s: %s module removed\n", __func__,
- dev_name(&chan->dev));
+ dma_chan_name(chan));
list_del_rcu(&device->global_node);
} else if (err)
pr_err("dmaengine: failed to get %s: (%d)",
- dev_name(&chan->dev), err);
+ dma_chan_name(chan), err);
else
break;
} else
pr_debug("%s: %s filter said false\n",
- __func__, dev_name(&chan->dev));
+ __func__, dma_chan_name(chan));
chan = NULL;
}
mutex_unlock(&dma_list_mutex);
pr_debug("%s: %s (%s)\n", __func__, chan ? "success" : "fail",
- chan ? dev_name(&chan->dev) : NULL);
+ chan ? dma_chan_name(chan) : NULL);
return chan;
}
@@ -521,7 +569,7 @@ void dmaengine_get(void)
break;
} else if (err)
pr_err("dmaengine: failed to get %s: (%d)",
- dev_name(&chan->dev), err);
+ dma_chan_name(chan), err);
}
}
mutex_unlock(&dma_list_mutex);
@@ -594,14 +642,20 @@ int dma_async_device_register(struct dma_device *device)
chan->local = alloc_percpu(typeof(*chan->local));
if (chan->local == NULL)
continue;
+ chan->dev = kzalloc(sizeof(*chan->dev), GFP_KERNEL);
+ if (chan->dev == NULL) {
+ free_percpu(chan->local);
+ continue;
+ }
chan->chan_id = chancnt++;
- chan->dev.class = &dma_devclass;
- chan->dev.parent = device->dev;
- dev_set_name(&chan->dev, "dma%dchan%d",
+ chan->dev->device.class = &dma_devclass;
+ chan->dev->device.parent = device->dev;
+ chan->dev->chan = chan;
+ dev_set_name(&chan->dev->device, "dma%dchan%d",
device->dev_id, chan->chan_id);
- rc = device_register(&chan->dev);
+ rc = device_register(&chan->dev->device);
if (rc) {
free_percpu(chan->local);
chan->local = NULL;
@@ -638,7 +692,10 @@ err_out:
list_for_each_entry(chan, &device->channels, device_node) {
if (chan->local == NULL)
continue;
- device_unregister(&chan->dev);
+ mutex_lock(&dma_list_mutex);
+ chan->dev->chan = NULL;
+ mutex_unlock(&dma_list_mutex);
+ device_unregister(&chan->dev->device);
free_percpu(chan->local);
}
return rc;
@@ -665,7 +722,10 @@ void dma_async_device_unregister(struct dma_device *device)
WARN_ONCE(chan->client_count,
"%s called while %d clients hold a reference\n",
__func__, chan->client_count);
- device_unregister(&chan->dev);
+ mutex_lock(&dma_list_mutex);
+ chan->dev->chan = NULL;
+ mutex_unlock(&dma_list_mutex);
+ device_unregister(&chan->dev->device);
}
}
EXPORT_SYMBOL(dma_async_device_unregister);
@@ -838,7 +898,7 @@ dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
return DMA_SUCCESS;
WARN_ONCE(tx->parent, "%s: speculatively walking dependency chain for"
- " %s\n", __func__, dev_name(&tx->chan->dev));
+ " %s\n", __func__, dma_chan_name(tx->chan));
/* poll through the dependency chain, return when tx is complete */
do {
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index c77d47c..3603f1e 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -80,7 +80,7 @@ static bool dmatest_match_channel(struct dma_chan *chan)
{
if (test_channel[0] == '\0')
return true;
- return strcmp(dev_name(&chan->dev), test_channel) == 0;
+ return strcmp(dma_chan_name(chan), test_channel) == 0;
}
static bool dmatest_match_device(struct dma_device *device)
@@ -325,7 +325,7 @@ static int dmatest_add_channel(struct dma_chan *chan)
dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
if (!dtc) {
- pr_warning("dmatest: No memory for %s\n", dev_name(&chan->dev));
+ pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
return -ENOMEM;
}
@@ -336,16 +336,16 @@ static int dmatest_add_channel(struct dma_chan *chan)
thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
if (!thread) {
pr_warning("dmatest: No memory for %s-test%u\n",
- dev_name(&chan->dev), i);
+ dma_chan_name(chan), i);
break;
}
thread->chan = dtc->chan;
smp_wmb();
thread->task = kthread_run(dmatest_func, thread, "%s-test%u",
- dev_name(&chan->dev), i);
+ dma_chan_name(chan), i);
if (IS_ERR(thread->task)) {
pr_warning("dmatest: Failed to run thread %s-test%u\n",
- dev_name(&chan->dev), i);
+ dma_chan_name(chan), i);
kfree(thread);
break;
}
@@ -355,7 +355,7 @@ static int dmatest_add_channel(struct dma_chan *chan)
list_add_tail(&thread->node, &dtc->threads);
}
- pr_info("dmatest: Started %u threads using %s\n", i, dev_name(&chan->dev));
+ pr_info("dmatest: Started %u threads using %s\n", i, dma_chan_name(chan));
list_add_tail(&dtc->node, &dmatest_channels);
nr_channels++;
@@ -408,7 +408,7 @@ static void __exit dmatest_exit(void)
list_del(&dtc->node);
dmatest_cleanup_channel(dtc);
pr_debug("dmatest: dropped channel %s\n",
- dev_name(&dtc->chan->dev));
+ dma_chan_name(dtc->chan));
dma_release_channel(dtc->chan);
}
}
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index a29dda8..6b702cc 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -70,6 +70,15 @@
* the controller, though.
*/
+static struct device *chan2dev(struct dma_chan *chan)
+{
+ return &chan->dev->device;
+}
+static struct device *chan2parent(struct dma_chan *chan)
+{
+ return chan->dev->device.parent;
+}
+
static struct dw_desc *dwc_first_active(struct dw_dma_chan *dwc)
{
return list_entry(dwc->active_list.next, struct dw_desc, desc_node);
@@ -93,12 +102,12 @@ static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc)
ret = desc;
break;
}
- dev_dbg(&dwc->chan.dev, "desc %p not ACKed\n", desc);
+ dev_dbg(chan2dev(&dwc->chan), "desc %p not ACKed\n", desc);
i++;
}
spin_unlock_bh(&dwc->lock);
- dev_vdbg(&dwc->chan.dev, "scanned %u descriptors on freelist\n", i);
+ dev_vdbg(chan2dev(&dwc->chan), "scanned %u descriptors on freelist\n", i);
return ret;
}
@@ -108,10 +117,10 @@ static void dwc_sync_desc_for_cpu(struct dw_dma_chan *dwc, struct dw_desc *desc)
struct dw_desc *child;
list_for_each_entry(child, &desc->txd.tx_list, desc_node)
- dma_sync_single_for_cpu(dwc->chan.dev.parent,
+ dma_sync_single_for_cpu(chan2parent(&dwc->chan),
child->txd.phys, sizeof(child->lli),
DMA_TO_DEVICE);
- dma_sync_single_for_cpu(dwc->chan.dev.parent,
+ dma_sync_single_for_cpu(chan2parent(&dwc->chan),
desc->txd.phys, sizeof(desc->lli),
DMA_TO_DEVICE);
}
@@ -129,11 +138,11 @@ static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc)
spin_lock_bh(&dwc->lock);
list_for_each_entry(child, &desc->txd.tx_list, desc_node)
- dev_vdbg(&dwc->chan.dev,
+ dev_vdbg(chan2dev(&dwc->chan),
"moving child desc %p to freelist\n",
child);
list_splice_init(&desc->txd.tx_list, &dwc->free_list);
- dev_vdbg(&dwc->chan.dev, "moving desc %p to freelist\n", desc);
+ dev_vdbg(chan2dev(&dwc->chan), "moving desc %p to freelist\n", desc);
list_add(&desc->desc_node, &dwc->free_list);
spin_unlock_bh(&dwc->lock);
}
@@ -163,9 +172,9 @@ static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first)
/* ASSERT: channel is idle */
if (dma_readl(dw, CH_EN) & dwc->mask) {
- dev_err(&dwc->chan.dev,
+ dev_err(chan2dev(&dwc->chan),
"BUG: Attempted to start non-idle channel\n");
- dev_err(&dwc->chan.dev,
+ dev_err(chan2dev(&dwc->chan),
" SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n",
channel_readl(dwc, SAR),
channel_readl(dwc, DAR),
@@ -193,7 +202,7 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc)
void *param;
struct dma_async_tx_descriptor *txd = &desc->txd;
- dev_vdbg(&dwc->chan.dev, "descriptor %u complete\n", txd->cookie);
+ dev_vdbg(chan2dev(&dwc->chan), "descriptor %u complete\n", txd->cookie);
dwc->completed = txd->cookie;
callback = txd->callback;
@@ -208,11 +217,11 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc)
* mapped before they were submitted...
*/
if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP))
- dma_unmap_page(dwc->chan.dev.parent, desc->lli.dar, desc->len,
- DMA_FROM_DEVICE);
+ dma_unmap_page(chan2parent(&dwc->chan), desc->lli.dar,
+ desc->len, DMA_FROM_DEVICE);
if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP))
- dma_unmap_page(dwc->chan.dev.parent, desc->lli.sar, desc->len,
- DMA_TO_DEVICE);
+ dma_unmap_page(chan2parent(&dwc->chan), desc->lli.sar,
+ desc->len, DMA_TO_DEVICE);
/*
* The API requires that no submissions are done from a
@@ -228,7 +237,7 @@ static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc)
LIST_HEAD(list);
if (dma_readl(dw, CH_EN) & dwc->mask) {
- dev_err(&dwc->chan.dev,
+ dev_err(chan2dev(&dwc->chan),
"BUG: XFER bit set, but channel not idle!\n");
/* Try to continue after resetting the channel... */
@@ -273,7 +282,7 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
return;
}
- dev_vdbg(&dwc->chan.dev, "scan_descriptors: llp=0x%x\n", llp);
+ dev_vdbg(chan2dev(&dwc->chan), "scan_descriptors: llp=0x%x\n", llp);
list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) {
if (desc->lli.llp == llp)
@@ -292,7 +301,7 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
dwc_descriptor_complete(dwc, desc);
}
- dev_err(&dwc->chan.dev,
+ dev_err(chan2dev(&dwc->chan),
"BUG: All descriptors done, but channel not idle!\n");
/* Try to continue after resetting the channel... */
@@ -308,7 +317,7 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
static void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_lli *lli)
{
- dev_printk(KERN_CRIT, &dwc->chan.dev,
+ dev_printk(KERN_CRIT, chan2dev(&dwc->chan),
" desc: s0x%x d0x%x l0x%x c0x%x:%x\n",
lli->sar, lli->dar, lli->llp,
lli->ctlhi, lli->ctllo);
@@ -342,9 +351,9 @@ static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc)
* controller flagged an error instead of scribbling over
* random memory locations.
*/
- dev_printk(KERN_CRIT, &dwc->chan.dev,
+ dev_printk(KERN_CRIT, chan2dev(&dwc->chan),
"Bad descriptor submitted for DMA!\n");
- dev_printk(KERN_CRIT, &dwc->chan.dev,
+ dev_printk(KERN_CRIT, chan2dev(&dwc->chan),
" cookie: %d\n", bad_desc->txd.cookie);
dwc_dump_lli(dwc, &bad_desc->lli);
list_for_each_entry(child, &bad_desc->txd.tx_list, desc_node)
@@ -442,12 +451,12 @@ static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx)
* for DMA. But this is hard to do in a race-free manner.
*/
if (list_empty(&dwc->active_list)) {
- dev_vdbg(&tx->chan->dev, "tx_submit: started %u\n",
+ dev_vdbg(chan2dev(tx->chan), "tx_submit: started %u\n",
desc->txd.cookie);
dwc_dostart(dwc, desc);
list_add_tail(&desc->desc_node, &dwc->active_list);
} else {
- dev_vdbg(&tx->chan->dev, "tx_submit: queued %u\n",
+ dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u\n",
desc->txd.cookie);
list_add_tail(&desc->desc_node, &dwc->queue);
@@ -472,11 +481,11 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
unsigned int dst_width;
u32 ctllo;
- dev_vdbg(&chan->dev, "prep_dma_memcpy d0x%x s0x%x l0x%zx f0x%lx\n",
+ dev_vdbg(chan2dev(chan), "prep_dma_memcpy d0x%x s0x%x l0x%zx f0x%lx\n",
dest, src, len, flags);
if (unlikely(!len)) {
- dev_dbg(&chan->dev, "prep_dma_memcpy: length is zero!\n");
+ dev_dbg(chan2dev(chan), "prep_dma_memcpy: length is zero!\n");
return NULL;
}
@@ -516,7 +525,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
first = desc;
} else {
prev->lli.llp = desc->txd.phys;
- dma_sync_single_for_device(chan->dev.parent,
+ dma_sync_single_for_device(chan2parent(chan),
prev->txd.phys, sizeof(prev->lli),
DMA_TO_DEVICE);
list_add_tail(&desc->desc_node,
@@ -531,7 +540,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
prev->lli.ctllo |= DWC_CTLL_INT_EN;
prev->lli.llp = 0;
- dma_sync_single_for_device(chan->dev.parent,
+ dma_sync_single_for_device(chan2parent(chan),
prev->txd.phys, sizeof(prev->lli),
DMA_TO_DEVICE);
@@ -562,7 +571,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
struct scatterlist *sg;
size_t total_len = 0;
- dev_vdbg(&chan->dev, "prep_dma_slave\n");
+ dev_vdbg(chan2dev(chan), "prep_dma_slave\n");
if (unlikely(!dws || !sg_len))
return NULL;
@@ -570,7 +579,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
reg_width = dws->reg_width;
prev = first = NULL;
- sg_len = dma_map_sg(chan->dev.parent, sgl, sg_len, direction);
+ sg_len = dma_map_sg(chan2parent(chan), sgl, sg_len, direction);
switch (direction) {
case DMA_TO_DEVICE:
@@ -587,7 +596,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
desc = dwc_desc_get(dwc);
if (!desc) {
- dev_err(&chan->dev,
+ dev_err(chan2dev(chan),
"not enough descriptors available\n");
goto err_desc_get;
}
@@ -607,7 +616,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
first = desc;
} else {
prev->lli.llp = desc->txd.phys;
- dma_sync_single_for_device(chan->dev.parent,
+ dma_sync_single_for_device(chan2parent(chan),
prev->txd.phys,
sizeof(prev->lli),
DMA_TO_DEVICE);
@@ -633,7 +642,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
desc = dwc_desc_get(dwc);
if (!desc) {
- dev_err(&chan->dev,
+ dev_err(chan2dev(chan),
"not enough descriptors available\n");
goto err_desc_get;
}
@@ -653,7 +662,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
first = desc;
} else {
prev->lli.llp = desc->txd.phys;
- dma_sync_single_for_device(chan->dev.parent,
+ dma_sync_single_for_device(chan2parent(chan),
prev->txd.phys,
sizeof(prev->lli),
DMA_TO_DEVICE);
@@ -673,7 +682,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
prev->lli.ctllo |= DWC_CTLL_INT_EN;
prev->lli.llp = 0;
- dma_sync_single_for_device(chan->dev.parent,
+ dma_sync_single_for_device(chan2parent(chan),
prev->txd.phys, sizeof(prev->lli),
DMA_TO_DEVICE);
@@ -768,11 +777,11 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
u32 cfghi;
u32 cfglo;
- dev_vdbg(&chan->dev, "alloc_chan_resources\n");
+ dev_vdbg(chan2dev(chan), "alloc_chan_resources\n");
/* ASSERT: channel is idle */
if (dma_readl(dw, CH_EN) & dwc->mask) {
- dev_dbg(&chan->dev, "DMA channel not idle?\n");
+ dev_dbg(chan2dev(chan), "DMA channel not idle?\n");
return -EIO;
}
@@ -808,7 +817,7 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
desc = kzalloc(sizeof(struct dw_desc), GFP_KERNEL);
if (!desc) {
- dev_info(&chan->dev,
+ dev_info(chan2dev(chan),
"only allocated %d descriptors\n", i);
spin_lock_bh(&dwc->lock);
break;
@@ -818,7 +827,7 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
desc->txd.tx_submit = dwc_tx_submit;
desc->txd.flags = DMA_CTRL_ACK;
INIT_LIST_HEAD(&desc->txd.tx_list);
- desc->txd.phys = dma_map_single(chan->dev.parent, &desc->lli,
+ desc->txd.phys = dma_map_single(chan2parent(chan), &desc->lli,
sizeof(desc->lli), DMA_TO_DEVICE);
dwc_desc_put(dwc, desc);
@@ -833,7 +842,7 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
spin_unlock_bh(&dwc->lock);
- dev_dbg(&chan->dev,
+ dev_dbg(chan2dev(chan),
"alloc_chan_resources allocated %d descriptors\n", i);
return i;
@@ -846,7 +855,7 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
struct dw_desc *desc, *_desc;
LIST_HEAD(list);
- dev_dbg(&chan->dev, "free_chan_resources (descs allocated=%u)\n",
+ dev_dbg(chan2dev(chan), "free_chan_resources (descs allocated=%u)\n",
dwc->descs_allocated);
/* ASSERT: channel is idle */
@@ -867,13 +876,13 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
spin_unlock_bh(&dwc->lock);
list_for_each_entry_safe(desc, _desc, &list, desc_node) {
- dev_vdbg(&chan->dev, " freeing descriptor %p\n", desc);
- dma_unmap_single(chan->dev.parent, desc->txd.phys,
+ dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc);
+ dma_unmap_single(chan2parent(chan), desc->txd.phys,
sizeof(desc->lli), DMA_TO_DEVICE);
kfree(desc);
}
- dev_vdbg(&chan->dev, "free_chan_resources done\n");
+ dev_vdbg(chan2dev(chan), "free_chan_resources done\n");
}
/*----------------------------------------------------------------------*/
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 46e0128..ca70a21 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -822,7 +822,7 @@ static int __devinit fsl_dma_chan_probe(struct fsl_dma_device *fdev,
*/
WARN_ON(fdev->feature != new_fsl_chan->feature);
- new_fsl_chan->dev = &new_fsl_chan->common.dev;
+ new_fsl_chan->dev = &new_fsl_chan->common.dev->device;
new_fsl_chan->reg_base = ioremap(new_fsl_chan->reg.start,
new_fsl_chan->reg.end - new_fsl_chan->reg.start + 1);
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 1419a50..d6b6bff 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -113,7 +113,7 @@ struct dma_chan_percpu {
* @device: ptr to the dma device who supplies this channel, always !%NULL
* @cookie: last cookie value returned to client
* @chan_id: channel ID for sysfs
- * @class_dev: class device for sysfs
+ * @dev: class device for sysfs
* @refcount: kref, used in "bigref" slow-mode
* @slow_ref: indicates that the DMA channel is free
* @rcu: the DMA channel's RCU head
@@ -128,7 +128,7 @@ struct dma_chan {
/* sysfs */
int chan_id;
- struct device dev;
+ struct dma_chan_dev *dev;
struct list_head device_node;
struct dma_chan_percpu *local;
@@ -136,7 +136,20 @@ struct dma_chan {
int table_count;
};
-#define to_dma_chan(p) container_of(p, struct dma_chan, dev)
+/**
+ * struct dma_chan_dev - relate sysfs device node to backing channel device
+ * @chan - driver channel device
+ * @device - sysfs device
+ */
+struct dma_chan_dev {
+ struct dma_chan *chan;
+ struct device device;
+};
+
+static inline const char *dma_chan_name(struct dma_chan *chan)
+{
+ return dev_name(&chan->dev->device);
+}
void dma_chan_cleanup(struct kref *kref);
On Wed, 03 Dec 2008 17:46:46 -0700
Dan Williams <[email protected]> wrote:
> Resolves:
> WARNING: at drivers/base/core.c:122 device_release+0x4d/0x52()
> Device 'dma0chan0' does not have a release() function, it is broken and must be fixed.
>
> The dma_chan_dev object is introduced to gear-match sysfs kobject and
> dmaengine channel lifetimes. When a channel is removed access to the
> sysfs entries return -ENODEV until the kobject can be released.
>
> The bulk of the change is updates to existing code to handle the extra
> layer of indirection between a dma_chan and its struct device.
>
> Reported-by: Alexander Beregalov <[email protected]>
> Cc: Stephen Hemminger <[email protected]>
> Cc: Haavard Skinnemoen <[email protected]>
> Signed-off-by: Dan Williams <[email protected]>
Much better thanks.
Hi Dan,
On Wed, 3 Dec 2008, Dan Williams wrote:
> Here are a few more dmaengine cleanups targeted for 2.6.29. The bulk of the
> change is fixing the dmaengine sysfs implementation.
>
> It has been pushed out to the 'upstream' tree of async_tx.git[1] and will move
> to -next shortly.
>
> ---
>
> Dan Williams (4):
> dmaengine: bump initcall level to arch_initcall
> dmaengine: advertise all channels on a device to dma_filter_fn
> dmaengine: use idr for registering dma device numbers
> dmaengine: add a release for dma class devices and dependent infrastructure
What about the last hunk from the patch at
http://marc.info/?l=linux-arm-kernel&m=122607472721145&w=2
? Can we add this tx_free pointer? Would you like me to submit it as a
separate patch? I'd like to be able to reuse tx-descriptors in clients, so
I then have to explicitly release them in the dmaengine device
(controller) driver.
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
On Thu, Dec 4, 2008 at 1:51 AM, Guennadi Liakhovetski
<[email protected]> wrote:
> What about the last hunk from the patch at
>
> http://marc.info/?l=linux-arm-kernel&m=122607472721145&w=2
>
> ? Can we add this tx_free pointer? Would you like me to submit it as a
> separate patch? I'd like to be able to reuse tx-descriptors in clients, so
> I then have to explicitly release them in the dmaengine device
> (controller) driver.
>
I took a look but the description does not explain why the driver
needs an explicit release. In what cases is the implied release, when
the descriptor is acked && done, insufficient?
On Thu, 4 Dec 2008, Dan Williams wrote:
> On Thu, Dec 4, 2008 at 1:51 AM, Guennadi Liakhovetski
> <[email protected]> wrote:
> > What about the last hunk from the patch at
> >
> > http://marc.info/?l=linux-arm-kernel&m=122607472721145&w=2
> >
> > ? Can we add this tx_free pointer? Would you like me to submit it as a
> > separate patch? I'd like to be able to reuse tx-descriptors in clients, so
> > I then have to explicitly release them in the dmaengine device
> > (controller) driver.
> >
>
> I took a look but the description does not explain why the driver
> needs an explicit release. In what cases is the implied release, when
> the descriptor is acked && done, insufficient?
v4l. I think, the proper moment to free tx-descriptors is at VIDIOC_DQBUF
time. I.e., there is an explicit ioctl from user-space: "free buffers
now". That's when I want to call .tx_free().
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer