Hi All,
This patch series converts s390's PCI support from its platform specific DMA
API implementation in arch/s390/pci/pci_dma.c to the common DMA IOMMU layer.
The conversion itself is done in patches 3-4 with patch 2 providing the final
necessary IOMMU driver improvement to handle s390's special IOTLB flush
out-of-resource indication in virtualized environments. Patches 1-2 can be
applied independently. The conversion itself only touches the s390 IOMMU driver
and arch code moving over remaining functions from the s390 DMA API
implementation. No changes to common code are necessary.
After patch 4 the basic conversion is done and on our partitioning machine
hypervisor LPAR performance matches or exceeds the existing code. When running
under z/VM or KVM however, performance plummets to about half of the existing
code due to a much higher rate of IOTLB flushes for unmapped pages. Due to the
hypervisors use of IOTLB flushes to synchronize their shadow tables these are
very expensive and minimizing them is key for regaining the performance loss.
To this end patches 5-7 propose a new, single queue, IOTLB flushing scheme as
an alternative to the existing per-CPU flush queues. Introducing an alternative
scheme was also suggested by Robin Murphy[1]. In the previous RFC of this
conversion Robin suggested reusing more of the existing queuing logic which
I incorporated since v2. The single queue mode is introduced in patch
5. It allows batching a much larger number of lazily freed IOVAs and was also
chosen as hypervisors tend to serialize IOTLB flushes removing some of the
gains of multiple queues. Except for going from one per-CPU to a global queue
the queue logic remains untouched.
Then patch 6 enables variable queue sizes using power of 2 queue sizes and
shift/mask to keep performance as close to the existing code as possible.
After this patch 7 introdues an IOMMU operation to automatically pick between
the existing per-CPU and new single queue flushing schemes on a per device
basis and utilizes this to enable single queue mode for PCI devices on s390
that require IOTLB flushes on map indicating expensive shadowing.
As it is implemented in common code the single queue IOTLB flushing scheme can
of course be used by other platforms with expensive IOTLB flushes. Particularly
virtio-iommu may be a candidate.
I did verify that the new scheme does work on my x86_64 Ryzen workstation by
locally modifying drivers/iommu/iommu.c:iommu_subsys_init() to default to the
single queue mode and verifying its use via "/sys/.../iommu_group/type". I did
not find problems with an AMD GPU, Intel NIC (with SR-IOV and KVM
pass-through), NVMes or any on board peripherals.
As with previous series this is available via my git.kernel.org tree[3] in the
dma_iommu_v3 branch with signed s390_dma_iommu_v3 tag. Thanks to previous IOMMU
changes merged with v6.2-rc1 this does apply directly on v6.2-rc2 now.
NOTE: Due to the large drop in performance I think we should not merge the DMA
API conversion (patches 3-4) until we have a more suited IOVA flushing scheme
with similar improvements as the proposed changes of patches 5-7.
Best regards,
Niklas
[0] https://lore.kernel.org/linux-iommu/[email protected]/
[1] https://lore.kernel.org/linux-iommu/[email protected]/
[2] https://lore.kernel.org/linux-iommu/[email protected]/
[3] https://git.kernel.org/pub/scm/linux/kernel/git/niks/linux.git/
Changes since v2:
- Move the IOTLB out-of-resource handling into the IOMMU enabling it also for
the IOMMU API (patch 2). This also makes this independent from the DMA API
conversion (Robin, Jason).
- Rename __IOMMU_DOMAIN_DMA_FQ to __IOMMU_DOMAIN_DMA_LAZY when introducing
single queue flushing mode.
- Make selecting between single and per-CPU flush queues an explicit IOMMU op
(patch 7)
Changes since RFC v1:
- Patch 1 uses dma_set_mask_and_coherent() (Christoph)
- Patch 3 now documents and allows the use of iommu.strict=0|1 on s390 and
deprecates s390_iommu=strict while making it an alias.
- Patches 5-7 completely reworked to reuse existing queue logic (Robin)
- Added patch 4 to allow using iommu.strict=0|1 to override
ops->def_domain_type.
Niklas Schnelle (7):
s390/ism: Set DMA coherent mask
iommu: Allow .iotlb_sync_map to fail and handle s390's -ENOMEM return
s390/pci: prepare is_passed_through() for dma-iommu
s390/pci: Use dma-iommu layer
iommu/dma: Allow a single FQ in addition to per-CPU FQs
iommu/dma: Enable variable queue size and use larger single queue
iommu/dma: Add IOMMU op to choose lazy domain type
.../admin-guide/kernel-parameters.txt | 9 +-
arch/s390/include/asm/pci.h | 7 -
arch/s390/include/asm/pci_dma.h | 120 +--
arch/s390/pci/Makefile | 2 +-
arch/s390/pci/pci.c | 22 +-
arch/s390/pci/pci_bus.c | 5 -
arch/s390/pci/pci_debug.c | 13 +-
arch/s390/pci/pci_dma.c | 732 ------------------
arch/s390/pci/pci_event.c | 17 +-
arch/s390/pci/pci_sysfs.c | 19 +-
drivers/iommu/Kconfig | 4 +-
drivers/iommu/amd/iommu.c | 5 +-
drivers/iommu/apple-dart.c | 5 +-
drivers/iommu/dma-iommu.c | 184 ++++-
drivers/iommu/intel/iommu.c | 5 +-
drivers/iommu/iommu.c | 48 +-
drivers/iommu/msm_iommu.c | 5 +-
drivers/iommu/mtk_iommu.c | 5 +-
drivers/iommu/s390-iommu.c | 430 +++++++++-
drivers/iommu/sprd-iommu.c | 5 +-
drivers/iommu/tegra-gart.c | 5 +-
drivers/s390/net/ism_drv.c | 2 +-
include/linux/iommu.h | 23 +-
23 files changed, 675 insertions(+), 997 deletions(-)
delete mode 100644 arch/s390/pci/pci_dma.c
--
2.34.1
A future change will convert the DMA API implementation from the
architecture specific arch/s390/pci/pci_dma.c to using the common code
drivers/iommu/dma-iommu.c which the utilizes the same IOMMU hardware
through the s390-iommu driver. Unlike the s390 specific DMA API this
requires devices to correctly call set the coherent mask to be allowed
to use IOVAs >2^32 in dma_alloc_coherent(). This was however not done
for ISM devices. ISM requires such addresses since currently the DMA
aperture for PCI devices starts at 2^32 and all calls to
dma_alloc_coherent() would thus fail.
Signed-off-by: Niklas Schnelle <[email protected]>
---
v1 -> v2:
- Use dma_set_mask_and_coherent() (Christoph Hellwig)
drivers/s390/net/ism_drv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c
index dfd401d9e362..aba03b613296 100644
--- a/drivers/s390/net/ism_drv.c
+++ b/drivers/s390/net/ism_drv.c
@@ -557,7 +557,7 @@ static int ism_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (ret)
goto err_disable;
- ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
+ ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (ret)
goto err_resource;
--
2.34.1
With two flush queue variants add an IOMMU operation that allows the
IOMMU driver to choose its preferred flush queue variant on a per device
basis. For s390 use this callback to choose the single queue variant
whenever the device requires explicit IOTLB flushes on map indicating
that we're running in a paged memory guest with expensive IOTLB flushes.
Signed-off-by: Niklas Schnelle <[email protected]>
---
drivers/iommu/iommu.c | 13 +++++++++++++
drivers/iommu/s390-iommu.c | 11 +++++++++++
include/linux/iommu.h | 5 +++++
3 files changed, 29 insertions(+)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 7ae2ff35b88e..c4699a0e5feb 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1616,6 +1616,16 @@ static int iommu_get_def_domain_type(struct device *dev)
return 0;
}
+static int iommu_get_lazy_domain_type(struct device *dev)
+{
+ const struct iommu_ops *ops = dev_iommu_ops(dev);
+
+ if (ops->lazy_domain_type)
+ return ops->lazy_domain_type(dev);
+
+ return 0;
+}
+
static int iommu_group_alloc_default_domain(struct bus_type *bus,
struct iommu_group *group,
unsigned int type)
@@ -1649,6 +1659,9 @@ static int iommu_alloc_default_domain(struct iommu_group *group,
type = iommu_get_def_domain_type(dev) ? : iommu_def_domain_type;
+ if (!!(type & __IOMMU_DOMAIN_DMA_LAZY))
+ type = iommu_get_lazy_domain_type(dev) ? : type;
+
return iommu_group_alloc_default_domain(dev->bus, group, type);
}
diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index 122219b3e89f..2575acd081b5 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -459,6 +459,16 @@ static void s390_iommu_get_resv_regions(struct device *dev,
}
}
+static int s390_iommu_lazy_domain_type(struct device *dev)
+{
+ struct zpci_dev *zdev = to_zpci_dev(dev);
+
+ if (zdev->tlb_refresh)
+ return IOMMU_DOMAIN_DMA_SQ;
+
+ return IOMMU_DOMAIN_DMA_FQ;
+}
+
static struct iommu_device *s390_iommu_probe_device(struct device *dev)
{
struct zpci_dev *zdev;
@@ -798,6 +808,7 @@ static const struct iommu_ops s390_iommu_ops = {
.device_group = generic_device_group,
.pgsize_bitmap = SZ_4K,
.get_resv_regions = s390_iommu_get_resv_regions,
+ .lazy_domain_type = s390_iommu_lazy_domain_type,
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = s390_iommu_attach_device,
.detach_dev = s390_iommu_detach_device,
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 74cee59516aa..aec895087f63 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -250,6 +250,10 @@ struct iommu_iotlb_gather {
* - IOMMU_DOMAIN_IDENTITY: must use an identity domain
* - IOMMU_DOMAIN_DMA: must use a dma domain
* - 0: use the default setting
+ * @lazy_domain_type: Domain type for lazy TLB invalidation, return value:
+ * - IOMMU_DOMAIN_DMA_FQ: Use per-CPU flush queue
+ * - IOMMU_DOMAIN_DMA_SQ: Use single flush queue
+ * - 0: use the default setting
* @default_domain_ops: the default ops for domains
* @remove_dev_pasid: Remove any translation configurations of a specific
* pasid, so that any DMA transactions with this pasid
@@ -283,6 +287,7 @@ struct iommu_ops {
struct iommu_page_response *msg);
int (*def_domain_type)(struct device *dev);
+ int (*lazy_domain_type)(struct device *dev);
void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid);
const struct iommu_domain_ops *default_domain_ops;
--
2.34.1
With the IOMMU always controlled through the IOMMU driver testing for
zdev->s390_domain is not a valid indication of the device being
passed-through. Instead test if zdev->kzdev is set.
Reviewed-by: Pierre Morel <[email protected]>
Signed-off-by: Niklas Schnelle <[email protected]>
---
arch/s390/pci/pci_event.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c
index b9324ca2eb94..4ef5a6a1d618 100644
--- a/arch/s390/pci/pci_event.c
+++ b/arch/s390/pci/pci_event.c
@@ -59,9 +59,16 @@ static inline bool ers_result_indicates_abort(pci_ers_result_t ers_res)
}
}
-static bool is_passed_through(struct zpci_dev *zdev)
+static bool is_passed_through(struct pci_dev *pdev)
{
- return zdev->s390_domain;
+ struct zpci_dev *zdev = to_zpci(pdev);
+ bool ret;
+
+ mutex_lock(&zdev->kzdev_lock);
+ ret = !!zdev->kzdev;
+ mutex_unlock(&zdev->kzdev_lock);
+
+ return ret;
}
static bool is_driver_supported(struct pci_driver *driver)
@@ -176,7 +183,7 @@ static pci_ers_result_t zpci_event_attempt_error_recovery(struct pci_dev *pdev)
}
pdev->error_state = pci_channel_io_frozen;
- if (is_passed_through(to_zpci(pdev))) {
+ if (is_passed_through(pdev)) {
pr_info("%s: Cannot be recovered in the host because it is a pass-through device\n",
pci_name(pdev));
goto out_unlock;
@@ -239,7 +246,7 @@ static void zpci_event_io_failure(struct pci_dev *pdev, pci_channel_state_t es)
* we will inject the error event and let the guest recover the device
* itself.
*/
- if (is_passed_through(to_zpci(pdev)))
+ if (is_passed_through(pdev))
goto out;
driver = to_pci_driver(pdev->dev.driver);
if (driver && driver->err_handler && driver->err_handler->error_detected)
--
2.34.1
Flush queues currently use a fixed compile time size of 256 entries.
This being a power of 2 allows the compiler to use shifts and mask
instead of more expensive modulo operations. With per-CPU flush queues
larger queue sizes would hit per-CPU allocation limits, with
a single flush queue these limits do not apply however. As single flush
queue mode is intended for environments with epensive IOTLB flushes it
then makes sense to use a larger queue size and timeout.
To this end re-order struct iova_fq so we can use a dynamic array and
make the flush queue size and timeout variable. So as not to lose the
shift and mask optimization, check that the variable length is a power
of 2 and use explicit shift and mask instead of letting the compiler
optimize this.
For now use a large fixed queue size and timeout for single flush queues
that brings its performance on s390 paged memory guests on par with the
previous s390 specific DMA API implementation. In the future the flush
queue size can then be turned into a config option or kernel parameter.
Signed-off-by: Niklas Schnelle <[email protected]>
---
drivers/iommu/dma-iommu.c | 60 ++++++++++++++++++++++++++-------------
1 file changed, 41 insertions(+), 19 deletions(-)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index ca27e8ba91a2..2c848145bc97 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -61,6 +61,8 @@ struct iommu_dma_cookie {
struct timer_list fq_timer;
/* 1 when timer is active, 0 when not */
atomic_t fq_timer_on;
+ /* timeout in ms */
+ unsigned long fq_timer_timeout;
};
/* Trivial linear page allocator for IOMMU_DMA_MSI_COOKIE */
dma_addr_t msi_iova;
@@ -86,10 +88,16 @@ static int __init iommu_dma_forcedac_setup(char *str)
early_param("iommu.forcedac", iommu_dma_forcedac_setup);
/* Number of entries per flush queue */
-#define IOVA_FQ_SIZE 256
+#define IOVA_DEFAULT_FQ_SIZE 256
+
+/* Number of entries for a single queue */
+#define IOVA_SINGLE_FQ_SIZE 32768
/* Timeout (in ms) after which entries are flushed from the queue */
-#define IOVA_FQ_TIMEOUT 10
+#define IOVA_DEFAULT_FQ_TIMEOUT 10
+
+/* Timeout (in ms) for a single queue */
+#define IOVA_SINGLE_FQ_TIMEOUT 1000
/* Flush queue entry for deferred flushing */
struct iova_fq_entry {
@@ -101,18 +109,19 @@ struct iova_fq_entry {
/* Per-CPU flush queue structure */
struct iova_fq {
- struct iova_fq_entry entries[IOVA_FQ_SIZE];
- unsigned int head, tail;
spinlock_t lock;
+ unsigned int head, tail;
+ unsigned int mod_mask;
+ struct iova_fq_entry entries[];
};
#define fq_ring_for_each(i, fq) \
- for ((i) = (fq)->head; (i) != (fq)->tail; (i) = ((i) + 1) % IOVA_FQ_SIZE)
+ for ((i) = (fq)->head; (i) != (fq)->tail; (i) = ((i) + 1) & (fq)->mod_mask)
static inline bool fq_full(struct iova_fq *fq)
{
assert_spin_locked(&fq->lock);
- return (((fq->tail + 1) % IOVA_FQ_SIZE) == fq->head);
+ return (((fq->tail + 1) & fq->mod_mask) == fq->head);
}
static inline unsigned int fq_ring_add(struct iova_fq *fq)
@@ -121,7 +130,7 @@ static inline unsigned int fq_ring_add(struct iova_fq *fq)
assert_spin_locked(&fq->lock);
- fq->tail = (idx + 1) % IOVA_FQ_SIZE;
+ fq->tail = (idx + 1) & fq->mod_mask;
return idx;
}
@@ -143,7 +152,7 @@ static void fq_ring_free(struct iommu_dma_cookie *cookie, struct iova_fq *fq)
fq->entries[idx].iova_pfn,
fq->entries[idx].pages);
- fq->head = (fq->head + 1) % IOVA_FQ_SIZE;
+ fq->head = (fq->head + 1) & fq->mod_mask;
}
}
@@ -241,7 +250,7 @@ static void queue_iova(struct iommu_dma_cookie *cookie,
if (!atomic_read(&cookie->fq_timer_on) &&
!atomic_xchg(&cookie->fq_timer_on, 1))
mod_timer(&cookie->fq_timer,
- jiffies + msecs_to_jiffies(IOVA_FQ_TIMEOUT));
+ jiffies + msecs_to_jiffies(cookie->fq_timer_timeout));
}
static void iommu_dma_free_fq_single(struct iova_fq *fq)
@@ -283,43 +292,45 @@ static void iommu_dma_free_fq(struct iommu_dma_cookie *cookie)
}
-static void iommu_dma_init_one_fq(struct iova_fq *fq)
+static void iommu_dma_init_one_fq(struct iova_fq *fq, unsigned int fq_size)
{
int i;
fq->head = 0;
fq->tail = 0;
+ fq->mod_mask = fq_size - 1;
spin_lock_init(&fq->lock);
- for (i = 0; i < IOVA_FQ_SIZE; i++)
+ for (i = 0; i < fq_size; i++)
INIT_LIST_HEAD(&fq->entries[i].freelist);
}
-static int iommu_dma_init_fq_single(struct iommu_dma_cookie *cookie)
+static int iommu_dma_init_fq_single(struct iommu_dma_cookie *cookie, unsigned int fq_size)
{
struct iova_fq *queue;
- queue = vzalloc(sizeof(*queue));
+ queue = vzalloc(struct_size(queue, entries, fq_size));
if (!queue)
return -ENOMEM;
- iommu_dma_init_one_fq(queue);
+ iommu_dma_init_one_fq(queue, fq_size);
cookie->single_fq = queue;
return 0;
}
-static int iommu_dma_init_fq_percpu(struct iommu_dma_cookie *cookie)
+static int iommu_dma_init_fq_percpu(struct iommu_dma_cookie *cookie, unsigned int fq_size)
{
struct iova_fq __percpu *queue;
int cpu;
- queue = alloc_percpu(struct iova_fq);
+ queue = __alloc_percpu(struct_size(queue, entries, fq_size),
+ __alignof__(*queue));
if (!queue)
return -ENOMEM;
for_each_possible_cpu(cpu)
- iommu_dma_init_one_fq(per_cpu_ptr(queue, cpu));
+ iommu_dma_init_one_fq(per_cpu_ptr(queue, cpu), fq_size);
cookie->percpu_fq = queue;
return 0;
}
@@ -328,24 +339,35 @@ static int iommu_dma_init_fq_percpu(struct iommu_dma_cookie *cookie)
int iommu_dma_init_fq(struct iommu_domain *domain)
{
struct iommu_dma_cookie *cookie = domain->iova_cookie;
+ unsigned int fq_size = IOVA_DEFAULT_FQ_SIZE;
int rc;
if (cookie->fq_domain)
return 0;
+ if (domain->type == IOMMU_DOMAIN_DMA_SQ)
+ fq_size = IOVA_SINGLE_FQ_SIZE;
+
+ if (!is_power_of_2(fq_size)) {
+ pr_err("FQ size must be a power of 2\n");
+ return -EINVAL;
+ }
+
atomic64_set(&cookie->fq_flush_start_cnt, 0);
atomic64_set(&cookie->fq_flush_finish_cnt, 0);
if (domain->type == IOMMU_DOMAIN_DMA_FQ)
- rc = iommu_dma_init_fq_percpu(cookie);
+ rc = iommu_dma_init_fq_percpu(cookie, fq_size);
else
- rc = iommu_dma_init_fq_single(cookie);
+ rc = iommu_dma_init_fq_single(cookie, fq_size);
if (rc) {
pr_warn("iova flush queue initialization failed\n");
return rc;
}
+ cookie->fq_timer_timeout = (domain->type == IOMMU_DOMAIN_DMA_SQ) ?
+ IOVA_SINGLE_FQ_TIMEOUT : IOVA_DEFAULT_FQ_TIMEOUT;
timer_setup(&cookie->fq_timer, fq_flush_timeout, 0);
atomic_set(&cookie->fq_timer_on, 0);
/*
--
2.34.1
While s390 already has a standard IOMMU driver and previous changes have
added I/O TLB flushing operations this driver is currently only used for
user-space PCI access such as vfio-pci. For the DMA API s390 instead
utilizes its own implementation in arch/s390/pci/pci_dma.c which drives
the same hardware and shares some code but requires a complex and
fragile hand over between DMA API and IOMMU API use of a device and
despite code sharing still leads to significant duplication and
maintenance effort. Let's utilize the common code DMAP API
implementation from drivers/iommu/dma-iommu.c instead allowing us to
get rid of arch/s390/pci/pci_dma.c.
Signed-off-by: Niklas Schnelle <[email protected]>
---
.../admin-guide/kernel-parameters.txt | 9 +-
arch/s390/include/asm/pci.h | 7 -
arch/s390/include/asm/pci_dma.h | 120 +--
arch/s390/pci/Makefile | 2 +-
arch/s390/pci/pci.c | 22 +-
arch/s390/pci/pci_bus.c | 5 -
arch/s390/pci/pci_debug.c | 13 +-
arch/s390/pci/pci_dma.c | 732 ------------------
arch/s390/pci/pci_event.c | 2 -
arch/s390/pci/pci_sysfs.c | 19 +-
drivers/iommu/Kconfig | 4 +-
drivers/iommu/s390-iommu.c | 389 +++++++++-
12 files changed, 406 insertions(+), 918 deletions(-)
delete mode 100644 arch/s390/pci/pci_dma.c
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 6cfa6e3996cf..1b61d2b690c0 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2167,7 +2167,7 @@
forcing Dual Address Cycle for PCI cards supporting
greater than 32-bit addressing.
- iommu.strict= [ARM64, X86] Configure TLB invalidation behaviour
+ iommu.strict= [ARM64, X86, S390] Configure TLB invalidation behaviour
Format: { "0" | "1" }
0 - Lazy mode.
Request that DMA unmap operations use deferred
@@ -5418,9 +5418,10 @@
s390_iommu= [HW,S390]
Set s390 IOTLB flushing mode
strict
- With strict flushing every unmap operation will result in
- an IOTLB flush. Default is lazy flushing before reuse,
- which is faster.
+ With strict flushing every unmap operation will result
+ in an IOTLB flush. Default is lazy flushing before
+ reuse, which is faster. Deprecated, equivalent to
+ iommu.strict=1.
s390_iommu_aperture= [KNL,S390]
Specifies the size of the per device DMA address space
diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index b248694e0024..3f74f1cf37df 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -159,13 +159,6 @@ struct zpci_dev {
unsigned long *dma_table;
int tlb_refresh;
- spinlock_t iommu_bitmap_lock;
- unsigned long *iommu_bitmap;
- unsigned long *lazy_bitmap;
- unsigned long iommu_size;
- unsigned long iommu_pages;
- unsigned int next_bit;
-
struct iommu_device iommu_dev; /* IOMMU core handle */
char res_name[16];
diff --git a/arch/s390/include/asm/pci_dma.h b/arch/s390/include/asm/pci_dma.h
index 91e63426bdc5..42d7cc4262ca 100644
--- a/arch/s390/include/asm/pci_dma.h
+++ b/arch/s390/include/asm/pci_dma.h
@@ -82,116 +82,16 @@ enum zpci_ioat_dtype {
#define ZPCI_TABLE_VALID_MASK 0x20
#define ZPCI_TABLE_PROT_MASK 0x200
-static inline unsigned int calc_rtx(dma_addr_t ptr)
-{
- return ((unsigned long) ptr >> ZPCI_RT_SHIFT) & ZPCI_INDEX_MASK;
-}
-
-static inline unsigned int calc_sx(dma_addr_t ptr)
-{
- return ((unsigned long) ptr >> ZPCI_ST_SHIFT) & ZPCI_INDEX_MASK;
-}
-
-static inline unsigned int calc_px(dma_addr_t ptr)
-{
- return ((unsigned long) ptr >> PAGE_SHIFT) & ZPCI_PT_MASK;
-}
-
-static inline void set_pt_pfaa(unsigned long *entry, phys_addr_t pfaa)
-{
- *entry &= ZPCI_PTE_FLAG_MASK;
- *entry |= (pfaa & ZPCI_PTE_ADDR_MASK);
-}
-
-static inline void set_rt_sto(unsigned long *entry, phys_addr_t sto)
-{
- *entry &= ZPCI_RTE_FLAG_MASK;
- *entry |= (sto & ZPCI_RTE_ADDR_MASK);
- *entry |= ZPCI_TABLE_TYPE_RTX;
-}
-
-static inline void set_st_pto(unsigned long *entry, phys_addr_t pto)
-{
- *entry &= ZPCI_STE_FLAG_MASK;
- *entry |= (pto & ZPCI_STE_ADDR_MASK);
- *entry |= ZPCI_TABLE_TYPE_SX;
-}
-
-static inline void validate_rt_entry(unsigned long *entry)
-{
- *entry &= ~ZPCI_TABLE_VALID_MASK;
- *entry &= ~ZPCI_TABLE_OFFSET_MASK;
- *entry |= ZPCI_TABLE_VALID;
- *entry |= ZPCI_TABLE_LEN_RTX;
-}
-
-static inline void validate_st_entry(unsigned long *entry)
-{
- *entry &= ~ZPCI_TABLE_VALID_MASK;
- *entry |= ZPCI_TABLE_VALID;
-}
-
-static inline void invalidate_pt_entry(unsigned long *entry)
-{
- WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_INVALID);
- *entry &= ~ZPCI_PTE_VALID_MASK;
- *entry |= ZPCI_PTE_INVALID;
-}
-
-static inline void validate_pt_entry(unsigned long *entry)
-{
- WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID);
- *entry &= ~ZPCI_PTE_VALID_MASK;
- *entry |= ZPCI_PTE_VALID;
-}
-
-static inline void entry_set_protected(unsigned long *entry)
-{
- *entry &= ~ZPCI_TABLE_PROT_MASK;
- *entry |= ZPCI_TABLE_PROTECTED;
-}
-
-static inline void entry_clr_protected(unsigned long *entry)
-{
- *entry &= ~ZPCI_TABLE_PROT_MASK;
- *entry |= ZPCI_TABLE_UNPROTECTED;
-}
-
-static inline int reg_entry_isvalid(unsigned long entry)
-{
- return (entry & ZPCI_TABLE_VALID_MASK) == ZPCI_TABLE_VALID;
-}
-
-static inline int pt_entry_isvalid(unsigned long entry)
-{
- return (entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID;
-}
-
-static inline unsigned long *get_rt_sto(unsigned long entry)
-{
- if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_RTX)
- return phys_to_virt(entry & ZPCI_RTE_ADDR_MASK);
- else
- return NULL;
-
-}
-
-static inline unsigned long *get_st_pto(unsigned long entry)
-{
- if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_SX)
- return phys_to_virt(entry & ZPCI_STE_ADDR_MASK);
- else
- return NULL;
-}
-
-/* Prototypes */
-void dma_free_seg_table(unsigned long);
-unsigned long *dma_alloc_cpu_table(void);
-void dma_cleanup_tables(unsigned long *);
-unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr);
-void dma_update_cpu_trans(unsigned long *entry, phys_addr_t page_addr, int flags);
-
-extern const struct dma_map_ops s390_pci_dma_ops;
+struct zpci_iommu_ctrs {
+ atomic64_t mapped_pages;
+ atomic64_t unmapped_pages;
+ atomic64_t global_rpcits;
+ atomic64_t sync_map_rpcits;
+ atomic64_t sync_rpcits;
+};
+
+struct zpci_dev;
+struct zpci_iommu_ctrs *zpci_get_iommu_ctrs(struct zpci_dev *zdev);
#endif
diff --git a/arch/s390/pci/Makefile b/arch/s390/pci/Makefile
index 5ae31ca9dd44..0547a10406e7 100644
--- a/arch/s390/pci/Makefile
+++ b/arch/s390/pci/Makefile
@@ -3,7 +3,7 @@
# Makefile for the s390 PCI subsystem.
#
-obj-$(CONFIG_PCI) += pci.o pci_irq.o pci_dma.o pci_clp.o pci_sysfs.o \
+obj-$(CONFIG_PCI) += pci.o pci_irq.o pci_clp.o pci_sysfs.o \
pci_event.o pci_debug.o pci_insn.o pci_mmio.o \
pci_bus.o pci_kvm_hook.o
obj-$(CONFIG_PCI_IOV) += pci_iov.o
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index ef38b1514c77..6b0fe8761509 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -124,7 +124,11 @@ int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
WARN_ON_ONCE(iota & 0x3fff);
fib.pba = base;
- fib.pal = limit;
+ /* Work around off by one in ISM virt device */
+ if (zdev->pft == 0x5 && limit > base)
+ fib.pal = limit + (1 << 12);
+ else
+ fib.pal = limit;
fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
fib.gd = zdev->gisa;
cc = zpci_mod_fc(req, &fib, status);
@@ -615,7 +619,6 @@ int pcibios_device_add(struct pci_dev *pdev)
pdev->no_vf_scan = 1;
pdev->dev.groups = zpci_attr_groups;
- pdev->dev.dma_ops = &s390_pci_dma_ops;
zpci_map_resources(pdev);
for (i = 0; i < PCI_STD_NUM_BARS; i++) {
@@ -789,8 +792,6 @@ int zpci_hot_reset_device(struct zpci_dev *zdev)
if (zdev->dma_table)
rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
virt_to_phys(zdev->dma_table), &status);
- else
- rc = zpci_dma_init_device(zdev);
if (rc) {
zpci_disable_device(zdev);
return rc;
@@ -915,11 +916,6 @@ int zpci_deconfigure_device(struct zpci_dev *zdev)
if (zdev->zbus->bus)
zpci_bus_remove_device(zdev, false);
- if (zdev->dma_table) {
- rc = zpci_dma_exit_device(zdev);
- if (rc)
- return rc;
- }
if (zdev_enabled(zdev)) {
rc = zpci_disable_device(zdev);
if (rc)
@@ -968,8 +964,6 @@ void zpci_release_device(struct kref *kref)
if (zdev->zbus->bus)
zpci_bus_remove_device(zdev, false);
- if (zdev->dma_table)
- zpci_dma_exit_device(zdev);
if (zdev_enabled(zdev))
zpci_disable_device(zdev);
@@ -1159,10 +1153,6 @@ static int __init pci_base_init(void)
if (rc)
goto out_irq;
- rc = zpci_dma_init();
- if (rc)
- goto out_dma;
-
rc = clp_scan_pci_devices();
if (rc)
goto out_find;
@@ -1172,8 +1162,6 @@ static int __init pci_base_init(void)
return 0;
out_find:
- zpci_dma_exit();
-out_dma:
zpci_irq_exit();
out_irq:
zpci_mem_exit();
diff --git a/arch/s390/pci/pci_bus.c b/arch/s390/pci/pci_bus.c
index 6a8da1b742ae..b15ad15999f8 100644
--- a/arch/s390/pci/pci_bus.c
+++ b/arch/s390/pci/pci_bus.c
@@ -49,11 +49,6 @@ static int zpci_bus_prepare_device(struct zpci_dev *zdev)
rc = zpci_enable_device(zdev);
if (rc)
return rc;
- rc = zpci_dma_init_device(zdev);
- if (rc) {
- zpci_disable_device(zdev);
- return rc;
- }
}
if (!zdev->has_resources) {
diff --git a/arch/s390/pci/pci_debug.c b/arch/s390/pci/pci_debug.c
index ca6bd98eec13..60cec57a3907 100644
--- a/arch/s390/pci/pci_debug.c
+++ b/arch/s390/pci/pci_debug.c
@@ -53,9 +53,12 @@ static char *pci_fmt3_names[] = {
};
static char *pci_sw_names[] = {
- "Allocated pages",
+/* TODO "Allocated pages", */
"Mapped pages",
"Unmapped pages",
+ "Global RPCITs",
+ "Sync Map RPCITs",
+ "Sync RPCITs",
};
static void pci_fmb_show(struct seq_file *m, char *name[], int length,
@@ -69,10 +72,14 @@ static void pci_fmb_show(struct seq_file *m, char *name[], int length,
static void pci_sw_counter_show(struct seq_file *m)
{
- struct zpci_dev *zdev = m->private;
- atomic64_t *counter = &zdev->allocated_pages;
+ struct zpci_iommu_ctrs *ctrs = zpci_get_iommu_ctrs(m->private);
+ atomic64_t *counter;
int i;
+ if (!ctrs)
+ return;
+
+ counter = &ctrs->mapped_pages;
for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
atomic64_read(counter));
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
deleted file mode 100644
index ea478d11fbd1..000000000000
--- a/arch/s390/pci/pci_dma.c
+++ /dev/null
@@ -1,732 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright IBM Corp. 2012
- *
- * Author(s):
- * Jan Glauber <[email protected]>
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/export.h>
-#include <linux/iommu-helper.h>
-#include <linux/dma-map-ops.h>
-#include <linux/vmalloc.h>
-#include <linux/pci.h>
-#include <asm/pci_dma.h>
-
-static struct kmem_cache *dma_region_table_cache;
-static struct kmem_cache *dma_page_table_cache;
-static int s390_iommu_strict;
-static u64 s390_iommu_aperture;
-static u32 s390_iommu_aperture_factor = 1;
-
-static int zpci_refresh_global(struct zpci_dev *zdev)
-{
- return zpci_refresh_trans((u64) zdev->fh << 32, zdev->start_dma,
- zdev->iommu_pages * PAGE_SIZE);
-}
-
-unsigned long *dma_alloc_cpu_table(void)
-{
- unsigned long *table, *entry;
-
- table = kmem_cache_alloc(dma_region_table_cache, GFP_ATOMIC);
- if (!table)
- return NULL;
-
- for (entry = table; entry < table + ZPCI_TABLE_ENTRIES; entry++)
- *entry = ZPCI_TABLE_INVALID;
- return table;
-}
-
-static void dma_free_cpu_table(void *table)
-{
- kmem_cache_free(dma_region_table_cache, table);
-}
-
-static unsigned long *dma_alloc_page_table(void)
-{
- unsigned long *table, *entry;
-
- table = kmem_cache_alloc(dma_page_table_cache, GFP_ATOMIC);
- if (!table)
- return NULL;
-
- for (entry = table; entry < table + ZPCI_PT_ENTRIES; entry++)
- *entry = ZPCI_PTE_INVALID;
- return table;
-}
-
-static void dma_free_page_table(void *table)
-{
- kmem_cache_free(dma_page_table_cache, table);
-}
-
-static unsigned long *dma_get_seg_table_origin(unsigned long *rtep)
-{
- unsigned long old_rte, rte;
- unsigned long *sto;
-
- rte = READ_ONCE(*rtep);
- if (reg_entry_isvalid(rte)) {
- sto = get_rt_sto(rte);
- } else {
- sto = dma_alloc_cpu_table();
- if (!sto)
- return NULL;
-
- set_rt_sto(&rte, virt_to_phys(sto));
- validate_rt_entry(&rte);
- entry_clr_protected(&rte);
-
- old_rte = cmpxchg(rtep, ZPCI_TABLE_INVALID, rte);
- if (old_rte != ZPCI_TABLE_INVALID) {
- /* Somone else was faster, use theirs */
- dma_free_cpu_table(sto);
- sto = get_rt_sto(old_rte);
- }
- }
- return sto;
-}
-
-static unsigned long *dma_get_page_table_origin(unsigned long *step)
-{
- unsigned long old_ste, ste;
- unsigned long *pto;
-
- ste = READ_ONCE(*step);
- if (reg_entry_isvalid(ste)) {
- pto = get_st_pto(ste);
- } else {
- pto = dma_alloc_page_table();
- if (!pto)
- return NULL;
- set_st_pto(&ste, virt_to_phys(pto));
- validate_st_entry(&ste);
- entry_clr_protected(&ste);
-
- old_ste = cmpxchg(step, ZPCI_TABLE_INVALID, ste);
- if (old_ste != ZPCI_TABLE_INVALID) {
- /* Somone else was faster, use theirs */
- dma_free_page_table(pto);
- pto = get_st_pto(old_ste);
- }
- }
- return pto;
-}
-
-unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr)
-{
- unsigned long *sto, *pto;
- unsigned int rtx, sx, px;
-
- rtx = calc_rtx(dma_addr);
- sto = dma_get_seg_table_origin(&rto[rtx]);
- if (!sto)
- return NULL;
-
- sx = calc_sx(dma_addr);
- pto = dma_get_page_table_origin(&sto[sx]);
- if (!pto)
- return NULL;
-
- px = calc_px(dma_addr);
- return &pto[px];
-}
-
-void dma_update_cpu_trans(unsigned long *ptep, phys_addr_t page_addr, int flags)
-{
- unsigned long pte;
-
- pte = READ_ONCE(*ptep);
- if (flags & ZPCI_PTE_INVALID) {
- invalidate_pt_entry(&pte);
- } else {
- set_pt_pfaa(&pte, page_addr);
- validate_pt_entry(&pte);
- }
-
- if (flags & ZPCI_TABLE_PROTECTED)
- entry_set_protected(&pte);
- else
- entry_clr_protected(&pte);
-
- xchg(ptep, pte);
-}
-
-static int __dma_update_trans(struct zpci_dev *zdev, phys_addr_t pa,
- dma_addr_t dma_addr, size_t size, int flags)
-{
- unsigned int nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
- phys_addr_t page_addr = (pa & PAGE_MASK);
- unsigned long *entry;
- int i, rc = 0;
-
- if (!nr_pages)
- return -EINVAL;
-
- if (!zdev->dma_table)
- return -EINVAL;
-
- for (i = 0; i < nr_pages; i++) {
- entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr);
- if (!entry) {
- rc = -ENOMEM;
- goto undo_cpu_trans;
- }
- dma_update_cpu_trans(entry, page_addr, flags);
- page_addr += PAGE_SIZE;
- dma_addr += PAGE_SIZE;
- }
-
-undo_cpu_trans:
- if (rc && ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID)) {
- flags = ZPCI_PTE_INVALID;
- while (i-- > 0) {
- page_addr -= PAGE_SIZE;
- dma_addr -= PAGE_SIZE;
- entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr);
- if (!entry)
- break;
- dma_update_cpu_trans(entry, page_addr, flags);
- }
- }
- return rc;
-}
-
-static int __dma_purge_tlb(struct zpci_dev *zdev, dma_addr_t dma_addr,
- size_t size, int flags)
-{
- unsigned long irqflags;
- int ret;
-
- /*
- * With zdev->tlb_refresh == 0, rpcit is not required to establish new
- * translations when previously invalid translation-table entries are
- * validated. With lazy unmap, rpcit is skipped for previously valid
- * entries, but a global rpcit is then required before any address can
- * be re-used, i.e. after each iommu bitmap wrap-around.
- */
- if ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID) {
- if (!zdev->tlb_refresh)
- return 0;
- } else {
- if (!s390_iommu_strict)
- return 0;
- }
-
- ret = zpci_refresh_trans((u64) zdev->fh << 32, dma_addr,
- PAGE_ALIGN(size));
- if (ret == -ENOMEM && !s390_iommu_strict) {
- /* enable the hypervisor to free some resources */
- if (zpci_refresh_global(zdev))
- goto out;
-
- spin_lock_irqsave(&zdev->iommu_bitmap_lock, irqflags);
- bitmap_andnot(zdev->iommu_bitmap, zdev->iommu_bitmap,
- zdev->lazy_bitmap, zdev->iommu_pages);
- bitmap_zero(zdev->lazy_bitmap, zdev->iommu_pages);
- spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, irqflags);
- ret = 0;
- }
-out:
- return ret;
-}
-
-static int dma_update_trans(struct zpci_dev *zdev, phys_addr_t pa,
- dma_addr_t dma_addr, size_t size, int flags)
-{
- int rc;
-
- rc = __dma_update_trans(zdev, pa, dma_addr, size, flags);
- if (rc)
- return rc;
-
- rc = __dma_purge_tlb(zdev, dma_addr, size, flags);
- if (rc && ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID))
- __dma_update_trans(zdev, pa, dma_addr, size, ZPCI_PTE_INVALID);
-
- return rc;
-}
-
-void dma_free_seg_table(unsigned long entry)
-{
- unsigned long *sto = get_rt_sto(entry);
- int sx;
-
- for (sx = 0; sx < ZPCI_TABLE_ENTRIES; sx++)
- if (reg_entry_isvalid(sto[sx]))
- dma_free_page_table(get_st_pto(sto[sx]));
-
- dma_free_cpu_table(sto);
-}
-
-void dma_cleanup_tables(unsigned long *table)
-{
- int rtx;
-
- if (!table)
- return;
-
- for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
- if (reg_entry_isvalid(table[rtx]))
- dma_free_seg_table(table[rtx]);
-
- dma_free_cpu_table(table);
-}
-
-static unsigned long __dma_alloc_iommu(struct device *dev,
- unsigned long start, int size)
-{
- struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
-
- return iommu_area_alloc(zdev->iommu_bitmap, zdev->iommu_pages,
- start, size, zdev->start_dma >> PAGE_SHIFT,
- dma_get_seg_boundary_nr_pages(dev, PAGE_SHIFT),
- 0);
-}
-
-static dma_addr_t dma_alloc_address(struct device *dev, int size)
-{
- struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
- unsigned long offset, flags;
-
- spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags);
- offset = __dma_alloc_iommu(dev, zdev->next_bit, size);
- if (offset == -1) {
- if (!s390_iommu_strict) {
- /* global flush before DMA addresses are reused */
- if (zpci_refresh_global(zdev))
- goto out_error;
-
- bitmap_andnot(zdev->iommu_bitmap, zdev->iommu_bitmap,
- zdev->lazy_bitmap, zdev->iommu_pages);
- bitmap_zero(zdev->lazy_bitmap, zdev->iommu_pages);
- }
- /* wrap-around */
- offset = __dma_alloc_iommu(dev, 0, size);
- if (offset == -1)
- goto out_error;
- }
- zdev->next_bit = offset + size;
- spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
-
- return zdev->start_dma + offset * PAGE_SIZE;
-
-out_error:
- spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
- return DMA_MAPPING_ERROR;
-}
-
-static void dma_free_address(struct device *dev, dma_addr_t dma_addr, int size)
-{
- struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
- unsigned long flags, offset;
-
- offset = (dma_addr - zdev->start_dma) >> PAGE_SHIFT;
-
- spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags);
- if (!zdev->iommu_bitmap)
- goto out;
-
- if (s390_iommu_strict)
- bitmap_clear(zdev->iommu_bitmap, offset, size);
- else
- bitmap_set(zdev->lazy_bitmap, offset, size);
-
-out:
- spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
-}
-
-static inline void zpci_err_dma(unsigned long rc, unsigned long addr)
-{
- struct {
- unsigned long rc;
- unsigned long addr;
- } __packed data = {rc, addr};
-
- zpci_err_hex(&data, sizeof(data));
-}
-
-static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
- unsigned long offset, size_t size,
- enum dma_data_direction direction,
- unsigned long attrs)
-{
- struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
- unsigned long pa = page_to_phys(page) + offset;
- int flags = ZPCI_PTE_VALID;
- unsigned long nr_pages;
- dma_addr_t dma_addr;
- int ret;
-
- /* This rounds up number of pages based on size and offset */
- nr_pages = iommu_num_pages(pa, size, PAGE_SIZE);
- dma_addr = dma_alloc_address(dev, nr_pages);
- if (dma_addr == DMA_MAPPING_ERROR) {
- ret = -ENOSPC;
- goto out_err;
- }
-
- /* Use rounded up size */
- size = nr_pages * PAGE_SIZE;
-
- if (direction == DMA_NONE || direction == DMA_TO_DEVICE)
- flags |= ZPCI_TABLE_PROTECTED;
-
- ret = dma_update_trans(zdev, pa, dma_addr, size, flags);
- if (ret)
- goto out_free;
-
- atomic64_add(nr_pages, &zdev->mapped_pages);
- return dma_addr + (offset & ~PAGE_MASK);
-
-out_free:
- dma_free_address(dev, dma_addr, nr_pages);
-out_err:
- zpci_err("map error:\n");
- zpci_err_dma(ret, pa);
- return DMA_MAPPING_ERROR;
-}
-
-static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr,
- size_t size, enum dma_data_direction direction,
- unsigned long attrs)
-{
- struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
- int npages, ret;
-
- npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
- dma_addr = dma_addr & PAGE_MASK;
- ret = dma_update_trans(zdev, 0, dma_addr, npages * PAGE_SIZE,
- ZPCI_PTE_INVALID);
- if (ret) {
- zpci_err("unmap error:\n");
- zpci_err_dma(ret, dma_addr);
- return;
- }
-
- atomic64_add(npages, &zdev->unmapped_pages);
- dma_free_address(dev, dma_addr, npages);
-}
-
-static void *s390_dma_alloc(struct device *dev, size_t size,
- dma_addr_t *dma_handle, gfp_t flag,
- unsigned long attrs)
-{
- struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
- struct page *page;
- phys_addr_t pa;
- dma_addr_t map;
-
- size = PAGE_ALIGN(size);
- page = alloc_pages(flag | __GFP_ZERO, get_order(size));
- if (!page)
- return NULL;
-
- pa = page_to_phys(page);
- map = s390_dma_map_pages(dev, page, 0, size, DMA_BIDIRECTIONAL, 0);
- if (dma_mapping_error(dev, map)) {
- __free_pages(page, get_order(size));
- return NULL;
- }
-
- atomic64_add(size / PAGE_SIZE, &zdev->allocated_pages);
- if (dma_handle)
- *dma_handle = map;
- return phys_to_virt(pa);
-}
-
-static void s390_dma_free(struct device *dev, size_t size,
- void *vaddr, dma_addr_t dma_handle,
- unsigned long attrs)
-{
- struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
-
- size = PAGE_ALIGN(size);
- atomic64_sub(size / PAGE_SIZE, &zdev->allocated_pages);
- s390_dma_unmap_pages(dev, dma_handle, size, DMA_BIDIRECTIONAL, 0);
- free_pages((unsigned long)vaddr, get_order(size));
-}
-
-/* Map a segment into a contiguous dma address area */
-static int __s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
- size_t size, dma_addr_t *handle,
- enum dma_data_direction dir)
-{
- unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
- struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
- dma_addr_t dma_addr_base, dma_addr;
- int flags = ZPCI_PTE_VALID;
- struct scatterlist *s;
- phys_addr_t pa = 0;
- int ret;
-
- dma_addr_base = dma_alloc_address(dev, nr_pages);
- if (dma_addr_base == DMA_MAPPING_ERROR)
- return -ENOMEM;
-
- dma_addr = dma_addr_base;
- if (dir == DMA_NONE || dir == DMA_TO_DEVICE)
- flags |= ZPCI_TABLE_PROTECTED;
-
- for (s = sg; dma_addr < dma_addr_base + size; s = sg_next(s)) {
- pa = page_to_phys(sg_page(s));
- ret = __dma_update_trans(zdev, pa, dma_addr,
- s->offset + s->length, flags);
- if (ret)
- goto unmap;
-
- dma_addr += s->offset + s->length;
- }
- ret = __dma_purge_tlb(zdev, dma_addr_base, size, flags);
- if (ret)
- goto unmap;
-
- *handle = dma_addr_base;
- atomic64_add(nr_pages, &zdev->mapped_pages);
-
- return ret;
-
-unmap:
- dma_update_trans(zdev, 0, dma_addr_base, dma_addr - dma_addr_base,
- ZPCI_PTE_INVALID);
- dma_free_address(dev, dma_addr_base, nr_pages);
- zpci_err("map error:\n");
- zpci_err_dma(ret, pa);
- return ret;
-}
-
-static int s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
- int nr_elements, enum dma_data_direction dir,
- unsigned long attrs)
-{
- struct scatterlist *s = sg, *start = sg, *dma = sg;
- unsigned int max = dma_get_max_seg_size(dev);
- unsigned int size = s->offset + s->length;
- unsigned int offset = s->offset;
- int count = 0, i, ret;
-
- for (i = 1; i < nr_elements; i++) {
- s = sg_next(s);
-
- s->dma_length = 0;
-
- if (s->offset || (size & ~PAGE_MASK) ||
- size + s->length > max) {
- ret = __s390_dma_map_sg(dev, start, size,
- &dma->dma_address, dir);
- if (ret)
- goto unmap;
-
- dma->dma_address += offset;
- dma->dma_length = size - offset;
-
- size = offset = s->offset;
- start = s;
- dma = sg_next(dma);
- count++;
- }
- size += s->length;
- }
- ret = __s390_dma_map_sg(dev, start, size, &dma->dma_address, dir);
- if (ret)
- goto unmap;
-
- dma->dma_address += offset;
- dma->dma_length = size - offset;
-
- return count + 1;
-unmap:
- for_each_sg(sg, s, count, i)
- s390_dma_unmap_pages(dev, sg_dma_address(s), sg_dma_len(s),
- dir, attrs);
-
- return ret;
-}
-
-static void s390_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
- int nr_elements, enum dma_data_direction dir,
- unsigned long attrs)
-{
- struct scatterlist *s;
- int i;
-
- for_each_sg(sg, s, nr_elements, i) {
- if (s->dma_length)
- s390_dma_unmap_pages(dev, s->dma_address, s->dma_length,
- dir, attrs);
- s->dma_address = 0;
- s->dma_length = 0;
- }
-}
-
-int zpci_dma_init_device(struct zpci_dev *zdev)
-{
- u8 status;
- int rc;
-
- /*
- * At this point, if the device is part of an IOMMU domain, this would
- * be a strong hint towards a bug in the IOMMU API (common) code and/or
- * simultaneous access via IOMMU and DMA API. So let's issue a warning.
- */
- WARN_ON(zdev->s390_domain);
-
- spin_lock_init(&zdev->iommu_bitmap_lock);
-
- zdev->dma_table = dma_alloc_cpu_table();
- if (!zdev->dma_table) {
- rc = -ENOMEM;
- goto out;
- }
-
- /*
- * Restrict the iommu bitmap size to the minimum of the following:
- * - s390_iommu_aperture which defaults to high_memory
- * - 3-level pagetable address limit minus start_dma offset
- * - DMA address range allowed by the hardware (clp query pci fn)
- *
- * Also set zdev->end_dma to the actual end address of the usable
- * range, instead of the theoretical maximum as reported by hardware.
- *
- * This limits the number of concurrently usable DMA mappings since
- * for each DMA mapped memory address we need a DMA address including
- * extra DMA addresses for multiple mappings of the same memory address.
- */
- zdev->start_dma = PAGE_ALIGN(zdev->start_dma);
- zdev->iommu_size = min3(s390_iommu_aperture,
- ZPCI_TABLE_SIZE_RT - zdev->start_dma,
- zdev->end_dma - zdev->start_dma + 1);
- zdev->end_dma = zdev->start_dma + zdev->iommu_size - 1;
- zdev->iommu_pages = zdev->iommu_size >> PAGE_SHIFT;
- zdev->iommu_bitmap = vzalloc(zdev->iommu_pages / 8);
- if (!zdev->iommu_bitmap) {
- rc = -ENOMEM;
- goto free_dma_table;
- }
- if (!s390_iommu_strict) {
- zdev->lazy_bitmap = vzalloc(zdev->iommu_pages / 8);
- if (!zdev->lazy_bitmap) {
- rc = -ENOMEM;
- goto free_bitmap;
- }
-
- }
- if (zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
- virt_to_phys(zdev->dma_table), &status)) {
- rc = -EIO;
- goto free_bitmap;
- }
-
- return 0;
-free_bitmap:
- vfree(zdev->iommu_bitmap);
- zdev->iommu_bitmap = NULL;
- vfree(zdev->lazy_bitmap);
- zdev->lazy_bitmap = NULL;
-free_dma_table:
- dma_free_cpu_table(zdev->dma_table);
- zdev->dma_table = NULL;
-out:
- return rc;
-}
-
-int zpci_dma_exit_device(struct zpci_dev *zdev)
-{
- int cc = 0;
-
- /*
- * At this point, if the device is part of an IOMMU domain, this would
- * be a strong hint towards a bug in the IOMMU API (common) code and/or
- * simultaneous access via IOMMU and DMA API. So let's issue a warning.
- */
- WARN_ON(zdev->s390_domain);
- if (zdev_enabled(zdev))
- cc = zpci_unregister_ioat(zdev, 0);
- /*
- * cc == 3 indicates the function is gone already. This can happen
- * if the function was deconfigured/disabled suddenly and we have not
- * received a new handle yet.
- */
- if (cc && cc != 3)
- return -EIO;
-
- dma_cleanup_tables(zdev->dma_table);
- zdev->dma_table = NULL;
- vfree(zdev->iommu_bitmap);
- zdev->iommu_bitmap = NULL;
- vfree(zdev->lazy_bitmap);
- zdev->lazy_bitmap = NULL;
- zdev->next_bit = 0;
- return 0;
-}
-
-static int __init dma_alloc_cpu_table_caches(void)
-{
- dma_region_table_cache = kmem_cache_create("PCI_DMA_region_tables",
- ZPCI_TABLE_SIZE, ZPCI_TABLE_ALIGN,
- 0, NULL);
- if (!dma_region_table_cache)
- return -ENOMEM;
-
- dma_page_table_cache = kmem_cache_create("PCI_DMA_page_tables",
- ZPCI_PT_SIZE, ZPCI_PT_ALIGN,
- 0, NULL);
- if (!dma_page_table_cache) {
- kmem_cache_destroy(dma_region_table_cache);
- return -ENOMEM;
- }
- return 0;
-}
-
-int __init zpci_dma_init(void)
-{
- s390_iommu_aperture = (u64)virt_to_phys(high_memory);
- if (!s390_iommu_aperture_factor)
- s390_iommu_aperture = ULONG_MAX;
- else
- s390_iommu_aperture *= s390_iommu_aperture_factor;
-
- return dma_alloc_cpu_table_caches();
-}
-
-void zpci_dma_exit(void)
-{
- kmem_cache_destroy(dma_page_table_cache);
- kmem_cache_destroy(dma_region_table_cache);
-}
-
-const struct dma_map_ops s390_pci_dma_ops = {
- .alloc = s390_dma_alloc,
- .free = s390_dma_free,
- .map_sg = s390_dma_map_sg,
- .unmap_sg = s390_dma_unmap_sg,
- .map_page = s390_dma_map_pages,
- .unmap_page = s390_dma_unmap_pages,
- .mmap = dma_common_mmap,
- .get_sgtable = dma_common_get_sgtable,
- .alloc_pages = dma_common_alloc_pages,
- .free_pages = dma_common_free_pages,
- /* dma_supported is unconditionally true without a callback */
-};
-EXPORT_SYMBOL_GPL(s390_pci_dma_ops);
-
-static int __init s390_iommu_setup(char *str)
-{
- if (!strcmp(str, "strict"))
- s390_iommu_strict = 1;
- return 1;
-}
-
-__setup("s390_iommu=", s390_iommu_setup);
-
-static int __init s390_iommu_aperture_setup(char *str)
-{
- if (kstrtou32(str, 10, &s390_iommu_aperture_factor))
- s390_iommu_aperture_factor = 1;
- return 1;
-}
-
-__setup("s390_iommu_aperture=", s390_iommu_aperture_setup);
diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c
index 4ef5a6a1d618..4d9773ef9e0a 100644
--- a/arch/s390/pci/pci_event.c
+++ b/arch/s390/pci/pci_event.c
@@ -313,8 +313,6 @@ static void zpci_event_hard_deconfigured(struct zpci_dev *zdev, u32 fh)
/* Even though the device is already gone we still
* need to free zPCI resources as part of the disable.
*/
- if (zdev->dma_table)
- zpci_dma_exit_device(zdev);
if (zdev_enabled(zdev))
zpci_disable_device(zdev);
zdev->state = ZPCI_FN_STATE_STANDBY;
diff --git a/arch/s390/pci/pci_sysfs.c b/arch/s390/pci/pci_sysfs.c
index cae280e5c047..8a7abac51816 100644
--- a/arch/s390/pci/pci_sysfs.c
+++ b/arch/s390/pci/pci_sysfs.c
@@ -56,6 +56,7 @@ static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
struct pci_dev *pdev = to_pci_dev(dev);
struct zpci_dev *zdev = to_zpci(pdev);
int ret = 0;
+ u8 status;
/* Can't use device_remove_self() here as that would lead us to lock
* the pci_rescan_remove_lock while holding the device' kernfs lock.
@@ -82,12 +83,6 @@ static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
pci_lock_rescan_remove();
if (pci_dev_is_added(pdev)) {
pci_stop_and_remove_bus_device(pdev);
- if (zdev->dma_table) {
- ret = zpci_dma_exit_device(zdev);
- if (ret)
- goto out;
- }
-
if (zdev_enabled(zdev)) {
ret = zpci_disable_device(zdev);
/*
@@ -105,14 +100,16 @@ static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
ret = zpci_enable_device(zdev);
if (ret)
goto out;
- ret = zpci_dma_init_device(zdev);
- if (ret) {
- zpci_disable_device(zdev);
- goto out;
+
+ if (zdev->dma_table) {
+ ret = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
+ virt_to_phys(zdev->dma_table), &status);
+ if (ret)
+ zpci_disable_device(zdev);
}
- pci_rescan_bus(zdev->zbus->bus);
}
out:
+ pci_rescan_bus(zdev->zbus->bus);
pci_unlock_rescan_remove();
if (kn)
sysfs_unbreak_active_protection(kn);
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 79707685d54a..c89ecd981448 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -93,7 +93,7 @@ config IOMMU_DEBUGFS
choice
prompt "IOMMU default domain type"
depends on IOMMU_API
- default IOMMU_DEFAULT_DMA_LAZY if X86 || IA64
+ default IOMMU_DEFAULT_DMA_LAZY if X86 || IA64 || S390
default IOMMU_DEFAULT_DMA_STRICT
help
Choose the type of IOMMU domain used to manage DMA API usage by
@@ -148,7 +148,7 @@ config OF_IOMMU
# IOMMU-agnostic DMA-mapping layer
config IOMMU_DMA
- def_bool ARM64 || IA64 || X86
+ def_bool ARM64 || IA64 || X86 || S390
select DMA_OPS
select IOMMU_API
select IOMMU_IOVA
diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index 6ba38b4f5b37..94ab9491d694 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -14,16 +14,300 @@
#include <linux/rcupdate.h>
#include <asm/pci_dma.h>
+#include "dma-iommu.h"
+
static const struct iommu_ops s390_iommu_ops;
+static struct kmem_cache *dma_region_table_cache;
+static struct kmem_cache *dma_page_table_cache;
+
+static u64 s390_iommu_aperture;
+static u32 s390_iommu_aperture_factor = 1;
+
struct s390_domain {
struct iommu_domain domain;
struct list_head devices;
+ struct zpci_iommu_ctrs ctrs;
unsigned long *dma_table;
spinlock_t list_lock;
struct rcu_head rcu;
};
+static inline unsigned int calc_rtx(dma_addr_t ptr)
+{
+ return ((unsigned long)ptr >> ZPCI_RT_SHIFT) & ZPCI_INDEX_MASK;
+}
+
+static inline unsigned int calc_sx(dma_addr_t ptr)
+{
+ return ((unsigned long)ptr >> ZPCI_ST_SHIFT) & ZPCI_INDEX_MASK;
+}
+
+static inline unsigned int calc_px(dma_addr_t ptr)
+{
+ return ((unsigned long)ptr >> PAGE_SHIFT) & ZPCI_PT_MASK;
+}
+
+static inline void set_pt_pfaa(unsigned long *entry, phys_addr_t pfaa)
+{
+ *entry &= ZPCI_PTE_FLAG_MASK;
+ *entry |= (pfaa & ZPCI_PTE_ADDR_MASK);
+}
+
+static inline void set_rt_sto(unsigned long *entry, phys_addr_t sto)
+{
+ *entry &= ZPCI_RTE_FLAG_MASK;
+ *entry |= (sto & ZPCI_RTE_ADDR_MASK);
+ *entry |= ZPCI_TABLE_TYPE_RTX;
+}
+
+static inline void set_st_pto(unsigned long *entry, phys_addr_t pto)
+{
+ *entry &= ZPCI_STE_FLAG_MASK;
+ *entry |= (pto & ZPCI_STE_ADDR_MASK);
+ *entry |= ZPCI_TABLE_TYPE_SX;
+}
+
+static inline void validate_rt_entry(unsigned long *entry)
+{
+ *entry &= ~ZPCI_TABLE_VALID_MASK;
+ *entry &= ~ZPCI_TABLE_OFFSET_MASK;
+ *entry |= ZPCI_TABLE_VALID;
+ *entry |= ZPCI_TABLE_LEN_RTX;
+}
+
+static inline void validate_st_entry(unsigned long *entry)
+{
+ *entry &= ~ZPCI_TABLE_VALID_MASK;
+ *entry |= ZPCI_TABLE_VALID;
+}
+
+static inline void invalidate_pt_entry(unsigned long *entry)
+{
+ WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_INVALID);
+ *entry &= ~ZPCI_PTE_VALID_MASK;
+ *entry |= ZPCI_PTE_INVALID;
+}
+
+static inline void validate_pt_entry(unsigned long *entry)
+{
+ WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID);
+ *entry &= ~ZPCI_PTE_VALID_MASK;
+ *entry |= ZPCI_PTE_VALID;
+}
+
+static inline void entry_set_protected(unsigned long *entry)
+{
+ *entry &= ~ZPCI_TABLE_PROT_MASK;
+ *entry |= ZPCI_TABLE_PROTECTED;
+}
+
+static inline void entry_clr_protected(unsigned long *entry)
+{
+ *entry &= ~ZPCI_TABLE_PROT_MASK;
+ *entry |= ZPCI_TABLE_UNPROTECTED;
+}
+
+static inline int reg_entry_isvalid(unsigned long entry)
+{
+ return (entry & ZPCI_TABLE_VALID_MASK) == ZPCI_TABLE_VALID;
+}
+
+static inline int pt_entry_isvalid(unsigned long entry)
+{
+ return (entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID;
+}
+
+static inline unsigned long *get_rt_sto(unsigned long entry)
+{
+ if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_RTX)
+ return phys_to_virt(entry & ZPCI_RTE_ADDR_MASK);
+ else
+ return NULL;
+}
+
+static inline unsigned long *get_st_pto(unsigned long entry)
+{
+ if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_SX)
+ return phys_to_virt(entry & ZPCI_STE_ADDR_MASK);
+ else
+ return NULL;
+}
+
+static int __init dma_alloc_cpu_table_caches(void)
+{
+ dma_region_table_cache = kmem_cache_create("PCI_DMA_region_tables",
+ ZPCI_TABLE_SIZE,
+ ZPCI_TABLE_ALIGN,
+ 0, NULL);
+ if (!dma_region_table_cache)
+ return -ENOMEM;
+
+ dma_page_table_cache = kmem_cache_create("PCI_DMA_page_tables",
+ ZPCI_PT_SIZE,
+ ZPCI_PT_ALIGN,
+ 0, NULL);
+ if (!dma_page_table_cache) {
+ kmem_cache_destroy(dma_region_table_cache);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static unsigned long *dma_alloc_cpu_table(void)
+{
+ unsigned long *table, *entry;
+
+ table = kmem_cache_alloc(dma_region_table_cache, GFP_ATOMIC);
+ if (!table)
+ return NULL;
+
+ for (entry = table; entry < table + ZPCI_TABLE_ENTRIES; entry++)
+ *entry = ZPCI_TABLE_INVALID;
+ return table;
+}
+
+static void dma_free_cpu_table(void *table)
+{
+ kmem_cache_free(dma_region_table_cache, table);
+}
+
+static void dma_free_page_table(void *table)
+{
+ kmem_cache_free(dma_page_table_cache, table);
+}
+
+static void dma_free_seg_table(unsigned long entry)
+{
+ unsigned long *sto = get_rt_sto(entry);
+ int sx;
+
+ for (sx = 0; sx < ZPCI_TABLE_ENTRIES; sx++)
+ if (reg_entry_isvalid(sto[sx]))
+ dma_free_page_table(get_st_pto(sto[sx]));
+
+ dma_free_cpu_table(sto);
+}
+
+static void dma_cleanup_tables(unsigned long *table)
+{
+ int rtx;
+
+ if (!table)
+ return;
+
+ for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
+ if (reg_entry_isvalid(table[rtx]))
+ dma_free_seg_table(table[rtx]);
+
+ dma_free_cpu_table(table);
+}
+
+static unsigned long *dma_alloc_page_table(void)
+{
+ unsigned long *table, *entry;
+
+ table = kmem_cache_alloc(dma_page_table_cache, GFP_ATOMIC);
+ if (!table)
+ return NULL;
+
+ for (entry = table; entry < table + ZPCI_PT_ENTRIES; entry++)
+ *entry = ZPCI_PTE_INVALID;
+ return table;
+}
+
+static unsigned long *dma_get_seg_table_origin(unsigned long *rtep)
+{
+ unsigned long old_rte, rte;
+ unsigned long *sto;
+
+ rte = READ_ONCE(*rtep);
+ if (reg_entry_isvalid(rte)) {
+ sto = get_rt_sto(rte);
+ } else {
+ sto = dma_alloc_cpu_table();
+ if (!sto)
+ return NULL;
+
+ set_rt_sto(&rte, virt_to_phys(sto));
+ validate_rt_entry(&rte);
+ entry_clr_protected(&rte);
+
+ old_rte = cmpxchg(rtep, ZPCI_TABLE_INVALID, rte);
+ if (old_rte != ZPCI_TABLE_INVALID) {
+ /* Somone else was faster, use theirs */
+ dma_free_cpu_table(sto);
+ sto = get_rt_sto(old_rte);
+ }
+ }
+ return sto;
+}
+
+static unsigned long *dma_get_page_table_origin(unsigned long *step)
+{
+ unsigned long old_ste, ste;
+ unsigned long *pto;
+
+ ste = READ_ONCE(*step);
+ if (reg_entry_isvalid(ste)) {
+ pto = get_st_pto(ste);
+ } else {
+ pto = dma_alloc_page_table();
+ if (!pto)
+ return NULL;
+ set_st_pto(&ste, virt_to_phys(pto));
+ validate_st_entry(&ste);
+ entry_clr_protected(&ste);
+
+ old_ste = cmpxchg(step, ZPCI_TABLE_INVALID, ste);
+ if (old_ste != ZPCI_TABLE_INVALID) {
+ /* Somone else was faster, use theirs */
+ dma_free_page_table(pto);
+ pto = get_st_pto(old_ste);
+ }
+ }
+ return pto;
+}
+
+static unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr)
+{
+ unsigned long *sto, *pto;
+ unsigned int rtx, sx, px;
+
+ rtx = calc_rtx(dma_addr);
+ sto = dma_get_seg_table_origin(&rto[rtx]);
+ if (!sto)
+ return NULL;
+
+ sx = calc_sx(dma_addr);
+ pto = dma_get_page_table_origin(&sto[sx]);
+ if (!pto)
+ return NULL;
+
+ px = calc_px(dma_addr);
+ return &pto[px];
+}
+
+static void dma_update_cpu_trans(unsigned long *ptep, phys_addr_t page_addr, int flags)
+{
+ unsigned long pte;
+
+ pte = READ_ONCE(*ptep);
+ if (flags & ZPCI_PTE_INVALID) {
+ invalidate_pt_entry(&pte);
+ } else {
+ set_pt_pfaa(&pte, page_addr);
+ validate_pt_entry(&pte);
+ }
+
+ if (flags & ZPCI_TABLE_PROTECTED)
+ entry_set_protected(&pte);
+ else
+ entry_clr_protected(&pte);
+
+ xchg(ptep, pte);
+}
+
static struct s390_domain *to_s390_domain(struct iommu_domain *dom)
{
return container_of(dom, struct s390_domain, domain);
@@ -45,9 +329,14 @@ static struct iommu_domain *s390_domain_alloc(unsigned domain_type)
{
struct s390_domain *s390_domain;
- if (domain_type != IOMMU_DOMAIN_UNMANAGED)
+ switch (domain_type) {
+ case IOMMU_DOMAIN_DMA:
+ case IOMMU_DOMAIN_DMA_FQ:
+ case IOMMU_DOMAIN_UNMANAGED:
+ break;
+ default:
return NULL;
-
+ }
s390_domain = kzalloc(sizeof(*s390_domain), GFP_KERNEL);
if (!s390_domain)
return NULL;
@@ -86,11 +375,14 @@ static void s390_domain_free(struct iommu_domain *domain)
call_rcu(&s390_domain->rcu, s390_iommu_rcu_free_domain);
}
-static void __s390_iommu_detach_device(struct zpci_dev *zdev)
+static void s390_iommu_detach_device(struct iommu_domain *domain,
+ struct device *dev)
{
- struct s390_domain *s390_domain = zdev->s390_domain;
+ struct s390_domain *s390_domain = to_s390_domain(domain);
+ struct zpci_dev *zdev = to_zpci_dev(dev);
unsigned long flags;
+ WARN_ON(zdev->s390_domain != to_s390_domain(domain));
if (!s390_domain)
return;
@@ -120,9 +412,7 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
return -EINVAL;
if (zdev->s390_domain)
- __s390_iommu_detach_device(zdev);
- else if (zdev->dma_table)
- zpci_dma_exit_device(zdev);
+ s390_iommu_detach_device(&zdev->s390_domain->domain, dev);
cc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
virt_to_phys(s390_domain->dma_table), &status);
@@ -144,17 +434,6 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
return 0;
}
-static void s390_iommu_detach_device(struct iommu_domain *domain,
- struct device *dev)
-{
- struct zpci_dev *zdev = to_zpci_dev(dev);
-
- WARN_ON(zdev->s390_domain != to_s390_domain(domain));
-
- __s390_iommu_detach_device(zdev);
- zpci_dma_init_device(zdev);
-}
-
static void s390_iommu_get_resv_regions(struct device *dev,
struct list_head *list)
{
@@ -207,7 +486,7 @@ static void s390_iommu_release_device(struct device *dev)
* to the device, but keep it attached to other devices in the group.
*/
if (zdev)
- __s390_iommu_detach_device(zdev);
+ s390_iommu_detach_device(&zdev->s390_domain->domain, dev);
}
@@ -225,6 +504,7 @@ static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain)
rcu_read_lock();
list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
+ atomic64_inc(&s390_domain->ctrs.global_rpcits);
zpci_refresh_all(zdev);
}
rcu_read_unlock();
@@ -243,6 +523,7 @@ static void s390_iommu_iotlb_sync(struct iommu_domain *domain,
rcu_read_lock();
list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
+ atomic64_inc(&s390_domain->ctrs.sync_rpcits);
zpci_refresh_trans((u64)zdev->fh << 32, gather->start,
size);
}
@@ -260,6 +541,7 @@ static int s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
if (!zdev->tlb_refresh)
continue;
+ atomic64_inc(&s390_domain->ctrs.sync_map_rpcits);
ret = zpci_refresh_trans((u64)zdev->fh << 32,
iova, size);
/*
@@ -351,16 +633,15 @@ static int s390_iommu_map_pages(struct iommu_domain *domain,
if (!IS_ALIGNED(iova | paddr, pgsize))
return -EINVAL;
- if (!(prot & IOMMU_READ))
- return -EINVAL;
-
if (!(prot & IOMMU_WRITE))
flags |= ZPCI_TABLE_PROTECTED;
rc = s390_iommu_validate_trans(s390_domain, paddr, iova,
- pgcount, flags);
- if (!rc)
+ pgcount, flags);
+ if (!rc) {
*mapped = size;
+ atomic64_add(pgcount, &s390_domain->ctrs.mapped_pages);
+ }
return rc;
}
@@ -416,12 +697,27 @@ static size_t s390_iommu_unmap_pages(struct iommu_domain *domain,
return 0;
iommu_iotlb_gather_add_range(gather, iova, size);
+ atomic64_add(pgcount, &s390_domain->ctrs.unmapped_pages);
return size;
}
+static void s390_iommu_probe_finalize(struct device *dev)
+{
+ iommu_dma_forcedac = true;
+ iommu_setup_dma_ops(dev, 0, U64_MAX);
+}
+
+struct zpci_iommu_ctrs *zpci_get_iommu_ctrs(struct zpci_dev *zdev)
+{
+ if (!zdev && !zdev->s390_domain)
+ return NULL;
+ return &zdev->s390_domain->ctrs;
+}
+
int zpci_init_iommu(struct zpci_dev *zdev)
{
+ u64 aperture_size;
int rc = 0;
rc = iommu_device_sysfs_add(&zdev->iommu_dev, NULL, NULL,
@@ -433,6 +729,12 @@ int zpci_init_iommu(struct zpci_dev *zdev)
if (rc)
goto out_sysfs;
+ zdev->start_dma = PAGE_ALIGN(zdev->start_dma);
+ aperture_size = min3(s390_iommu_aperture,
+ ZPCI_TABLE_SIZE_RT - zdev->start_dma,
+ zdev->end_dma - zdev->start_dma + 1);
+ zdev->end_dma = zdev->start_dma + aperture_size - 1;
+
return 0;
out_sysfs:
@@ -448,10 +750,49 @@ void zpci_destroy_iommu(struct zpci_dev *zdev)
iommu_device_sysfs_remove(&zdev->iommu_dev);
}
+static int __init s390_iommu_setup(char *str)
+{
+ if (!strcmp(str, "strict")) {
+ pr_warn("s390_iommu=strict deprecated; use iommu.strict=1 instead\n");
+ iommu_set_dma_strict();
+ }
+ return 1;
+}
+
+__setup("s390_iommu=", s390_iommu_setup);
+
+static int __init s390_iommu_aperture_setup(char *str)
+{
+ if (kstrtou32(str, 10, &s390_iommu_aperture_factor))
+ s390_iommu_aperture_factor = 1;
+ return 1;
+}
+
+__setup("s390_iommu_aperture=", s390_iommu_aperture_setup);
+
+static int __init s390_iommu_init(void)
+{
+ int rc;
+
+ s390_iommu_aperture = (u64)virt_to_phys(high_memory);
+ if (!s390_iommu_aperture_factor)
+ s390_iommu_aperture = ULONG_MAX;
+ else
+ s390_iommu_aperture *= s390_iommu_aperture_factor;
+
+ rc = dma_alloc_cpu_table_caches();
+ if (rc)
+ return rc;
+
+ return rc;
+}
+subsys_initcall(s390_iommu_init);
+
static const struct iommu_ops s390_iommu_ops = {
.capable = s390_iommu_capable,
.domain_alloc = s390_domain_alloc,
.probe_device = s390_iommu_probe_device,
+ .probe_finalize = s390_iommu_probe_finalize,
.release_device = s390_iommu_release_device,
.device_group = generic_device_group,
.pgsize_bitmap = SZ_4K,
--
2.34.1
On s390 .iotlb_sync_map is used to sync mappings to an underlying
hypervisor by letting the hypervisor inspect the synced IOVA range and
updating its shadow table. This however means that it can fail as the
hypervisor may run out of resources. This can be due to the hypervisor
being unable to pin guest pages, due to a limit on concurrently mapped
addresses such as vfio_iommu_type1.dma_entry_limit or other resources.
Either way such a failure to sync a mapping should result in
a DMA_MAPPING_EROR.
Now especially when running with batched IOTLB flushes for unmap it may
be that some IOVAs have already been invalidated but not yet synced via
.iotlb_sync_map. Thus if the hypervisor indicates running out of
resources, first do a global flush allowing the hypervisor to free
resources associated with these mappings and only if that also fails
report this error to callers.
Signed-off-by: Niklas Schnelle <[email protected]>
---
drivers/iommu/amd/iommu.c | 5 +++--
drivers/iommu/apple-dart.c | 5 +++--
drivers/iommu/intel/iommu.c | 5 +++--
drivers/iommu/iommu.c | 20 ++++++++++++++++----
drivers/iommu/msm_iommu.c | 5 +++--
drivers/iommu/mtk_iommu.c | 5 +++--
drivers/iommu/s390-iommu.c | 29 ++++++++++++++++++++++++-----
drivers/iommu/sprd-iommu.c | 5 +++--
drivers/iommu/tegra-gart.c | 5 +++--
include/linux/iommu.h | 4 ++--
10 files changed, 63 insertions(+), 25 deletions(-)
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index cbeaab55c0db..3df7d20e0e52 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2180,14 +2180,15 @@ static int amd_iommu_attach_device(struct iommu_domain *dom,
return ret;
}
-static void amd_iommu_iotlb_sync_map(struct iommu_domain *dom,
- unsigned long iova, size_t size)
+static int amd_iommu_iotlb_sync_map(struct iommu_domain *dom,
+ unsigned long iova, size_t size)
{
struct protection_domain *domain = to_pdomain(dom);
struct io_pgtable_ops *ops = &domain->iop.iop.ops;
if (ops->map_pages)
domain_flush_np_cache(domain, iova, size);
+ return 0;
}
static int amd_iommu_map_pages(struct iommu_domain *dom, unsigned long iova,
diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
index 4f4a323be0d0..4a76f4d95459 100644
--- a/drivers/iommu/apple-dart.c
+++ b/drivers/iommu/apple-dart.c
@@ -344,10 +344,11 @@ static void apple_dart_iotlb_sync(struct iommu_domain *domain,
apple_dart_domain_flush_tlb(to_dart_domain(domain));
}
-static void apple_dart_iotlb_sync_map(struct iommu_domain *domain,
- unsigned long iova, size_t size)
+static int apple_dart_iotlb_sync_map(struct iommu_domain *domain,
+ unsigned long iova, size_t size)
{
apple_dart_domain_flush_tlb(to_dart_domain(domain));
+ return 0;
}
static phys_addr_t apple_dart_iova_to_phys(struct iommu_domain *domain,
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 59df7e42fd53..3b36a544c8fa 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4725,8 +4725,8 @@ static bool risky_device(struct pci_dev *pdev)
return false;
}
-static void intel_iommu_iotlb_sync_map(struct iommu_domain *domain,
- unsigned long iova, size_t size)
+static int intel_iommu_iotlb_sync_map(struct iommu_domain *domain,
+ unsigned long iova, size_t size)
{
struct dmar_domain *dmar_domain = to_dmar_domain(domain);
unsigned long pages = aligned_nrpages(iova, size);
@@ -4736,6 +4736,7 @@ static void intel_iommu_iotlb_sync_map(struct iommu_domain *domain,
xa_for_each(&dmar_domain->iommu_array, i, info)
__mapping_notify_one(info->iommu, dmar_domain, pfn, pages);
+ return 0;
}
static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index de91dd88705b..8f97ed81b123 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2367,8 +2367,17 @@ static int _iommu_map(struct iommu_domain *domain, unsigned long iova,
int ret;
ret = __iommu_map(domain, iova, paddr, size, prot, gfp);
- if (ret == 0 && ops->iotlb_sync_map)
- ops->iotlb_sync_map(domain, iova, size);
+ if (ret == 0 && ops->iotlb_sync_map) {
+ ret = ops->iotlb_sync_map(domain, iova, size);
+ if (ret)
+ goto out_err;
+ }
+
+ return ret;
+
+out_err:
+ /* undo mappings already done */
+ iommu_unmap(domain, iova, size);
return ret;
}
@@ -2516,8 +2525,11 @@ static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
sg = sg_next(sg);
}
- if (ops->iotlb_sync_map)
- ops->iotlb_sync_map(domain, iova, mapped);
+ if (ops->iotlb_sync_map) {
+ ret = ops->iotlb_sync_map(domain, iova, mapped);
+ if (ret)
+ goto out_err;
+ }
return mapped;
out_err:
diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index c60624910872..62fc52765554 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -486,12 +486,13 @@ static int msm_iommu_map(struct iommu_domain *domain, unsigned long iova,
return ret;
}
-static void msm_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
- size_t size)
+static int msm_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
+ size_t size)
{
struct msm_priv *priv = to_msm_priv(domain);
__flush_iotlb_range(iova, size, SZ_4K, false, priv);
+ return 0;
}
static size_t msm_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 2badd6acfb23..76d413aef1ef 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -758,12 +758,13 @@ static void mtk_iommu_iotlb_sync(struct iommu_domain *domain,
mtk_iommu_tlb_flush_range_sync(gather->start, length, dom->bank);
}
-static void mtk_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
- size_t size)
+static int mtk_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
+ size_t size)
{
struct mtk_iommu_domain *dom = to_mtk_domain(domain);
mtk_iommu_tlb_flush_range_sync(iova, size, dom->bank);
+ return 0;
}
static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index ed33c6cce083..6ba38b4f5b37 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -210,6 +210,14 @@ static void s390_iommu_release_device(struct device *dev)
__s390_iommu_detach_device(zdev);
}
+
+static int zpci_refresh_all(struct zpci_dev *zdev)
+{
+ return zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma,
+ zdev->end_dma - zdev->start_dma + 1);
+
+}
+
static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain)
{
struct s390_domain *s390_domain = to_s390_domain(domain);
@@ -217,8 +225,7 @@ static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain)
rcu_read_lock();
list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
- zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma,
- zdev->end_dma - zdev->start_dma + 1);
+ zpci_refresh_all(zdev);
}
rcu_read_unlock();
}
@@ -242,20 +249,32 @@ static void s390_iommu_iotlb_sync(struct iommu_domain *domain,
rcu_read_unlock();
}
-static void s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
+static int s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
unsigned long iova, size_t size)
{
struct s390_domain *s390_domain = to_s390_domain(domain);
struct zpci_dev *zdev;
+ int ret = 0;
rcu_read_lock();
list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
if (!zdev->tlb_refresh)
continue;
- zpci_refresh_trans((u64)zdev->fh << 32,
- iova, size);
+ ret = zpci_refresh_trans((u64)zdev->fh << 32,
+ iova, size);
+ /*
+ * let the hypervisor disover invalidated entries
+ * allowing it to free IOVAs and unpin pages
+ */
+ if (ret == -ENOMEM) {
+ ret = zpci_refresh_all(zdev);
+ if (ret)
+ break;
+ }
}
rcu_read_unlock();
+
+ return ret;
}
static int s390_iommu_validate_trans(struct s390_domain *s390_domain,
diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c
index 219bfa11f7f4..9e590829992c 100644
--- a/drivers/iommu/sprd-iommu.c
+++ b/drivers/iommu/sprd-iommu.c
@@ -330,8 +330,8 @@ static size_t sprd_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
return size;
}
-static void sprd_iommu_sync_map(struct iommu_domain *domain,
- unsigned long iova, size_t size)
+static int sprd_iommu_sync_map(struct iommu_domain *domain,
+ unsigned long iova, size_t size)
{
struct sprd_iommu_domain *dom = to_sprd_domain(domain);
unsigned int reg;
@@ -343,6 +343,7 @@ static void sprd_iommu_sync_map(struct iommu_domain *domain,
/* clear IOMMU TLB buffer after page table updated */
sprd_iommu_write(dom->sdev, reg, 0xffffffff);
+ return 0;
}
static void sprd_iommu_sync(struct iommu_domain *domain,
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index ed53279d1106..a59966290e46 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -252,10 +252,11 @@ static int gart_iommu_of_xlate(struct device *dev,
return 0;
}
-static void gart_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
- size_t size)
+static int gart_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
+ size_t size)
{
FLUSH_GART_REGS(gart_handle);
+ return 0;
}
static void gart_iommu_sync(struct iommu_domain *domain,
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 46e1347bfa22..e7f76599f09e 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -332,8 +332,8 @@ struct iommu_domain_ops {
struct iommu_iotlb_gather *iotlb_gather);
void (*flush_iotlb_all)(struct iommu_domain *domain);
- void (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
- size_t size);
+ int (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
+ size_t size);
void (*iotlb_sync)(struct iommu_domain *domain,
struct iommu_iotlb_gather *iotlb_gather);
--
2.34.1
On 02.01.23 12:56, Niklas Schnelle wrote:
> On s390 .iotlb_sync_map is used to sync mappings to an underlying
> hypervisor by letting the hypervisor inspect the synced IOVA range and
> updating its shadow table. This however means that it can fail as the
> hypervisor may run out of resources. This can be due to the hypervisor
> being unable to pin guest pages, due to a limit on concurrently mapped
> addresses such as vfio_iommu_type1.dma_entry_limit or other resources.
> Either way such a failure to sync a mapping should result in
> a DMA_MAPPING_EROR.
>
> Now especially when running with batched IOTLB flushes for unmap it may
> be that some IOVAs have already been invalidated but not yet synced via
> .iotlb_sync_map. Thus if the hypervisor indicates running out of
> resources, first do a global flush allowing the hypervisor to free
> resources associated with these mappings and only if that also fails
> report this error to callers.
>
> Signed-off-by: Niklas Schnelle <[email protected]>
> ---
Just a small typo, I noticed
[...]
> diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
> index ed33c6cce083..6ba38b4f5b37 100644
> --- a/drivers/iommu/s390-iommu.c
> +++ b/drivers/iommu/s390-iommu.c
> @@ -210,6 +210,14 @@ static void s390_iommu_release_device(struct device *dev)
> __s390_iommu_detach_device(zdev);
> }
>
> +
> +static int zpci_refresh_all(struct zpci_dev *zdev)
> +{
> + return zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma,
> + zdev->end_dma - zdev->start_dma + 1);
> +
> +}
> +
> static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain)
> {
> struct s390_domain *s390_domain = to_s390_domain(domain);
> @@ -217,8 +225,7 @@ static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain)
>
> rcu_read_lock();
> list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
> - zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma,
> - zdev->end_dma - zdev->start_dma + 1);
> + zpci_refresh_all(zdev);
> }
> rcu_read_unlock();
> }
> @@ -242,20 +249,32 @@ static void s390_iommu_iotlb_sync(struct iommu_domain *domain,
> rcu_read_unlock();
> }
>
> -static void s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
> +static int s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
> unsigned long iova, size_t size)
> {
> struct s390_domain *s390_domain = to_s390_domain(domain);
> struct zpci_dev *zdev;
> + int ret = 0;
>
> rcu_read_lock();
> list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
> if (!zdev->tlb_refresh)
> continue;
> - zpci_refresh_trans((u64)zdev->fh << 32,
> - iova, size);
> + ret = zpci_refresh_trans((u64)zdev->fh << 32,
> + iova, size);
> + /*
> + * let the hypervisor disover invalidated entries
typo: s/disover/discover/g
> + * allowing it to free IOVAs and unpin pages
> + */
> + if (ret == -ENOMEM) {
> + ret = zpci_refresh_all(zdev);
> + if (ret)
> + break;
> + }
> }
> rcu_read_unlock();
> +
> + return ret;
> }
>
> static int s390_iommu_validate_trans(struct s390_domain *s390_domain,
[...]
On 02.01.23 12:56, Niklas Schnelle wrote:
> A future change will convert the DMA API implementation from the
> architecture specific arch/s390/pci/pci_dma.c to using the common code
> drivers/iommu/dma-iommu.c which the utilizes the same IOMMU hardware
> through the s390-iommu driver. Unlike the s390 specific DMA API this
> requires devices to correctly call set the coherent mask to be allowed
^^^correctly set ^^^
> to use IOVAs >2^32 in dma_alloc_coherent(). This was however not done
> for ISM devices. ISM requires such addresses since currently the DMA
> aperture for PCI devices starts at 2^32 and all calls to
> dma_alloc_coherent() would thus fail.
>
> Signed-off-by: Niklas Schnelle <[email protected]>
> ---
> v1 -> v2:
> - Use dma_set_mask_and_coherent() (Christoph Hellwig)
>
> drivers/s390/net/ism_drv.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c
> index dfd401d9e362..aba03b613296 100644
> --- a/drivers/s390/net/ism_drv.c
> +++ b/drivers/s390/net/ism_drv.c
> @@ -557,7 +557,7 @@ static int ism_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> if (ret)
> goto err_disable;
>
> - ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
> + ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> if (ret)
> goto err_resource;
>
Reviewed-by: Alexandra Winter <[email protected]>
On Mon, 2023-01-02 at 19:25 +0100, Alexandra Winter wrote:
>
> On 02.01.23 12:56, Niklas Schnelle wrote:
> > On s390 .iotlb_sync_map is used to sync mappings to an underlying
> > hypervisor by letting the hypervisor inspect the synced IOVA range and
> > updating its shadow table. This however means that it can fail as the
> > hypervisor may run out of resources. This can be due to the hypervisor
> > being unable to pin guest pages, due to a limit on concurrently mapped
> > addresses such as vfio_iommu_type1.dma_entry_limit or other resources.
> > Either way such a failure to sync a mapping should result in
> > a DMA_MAPPING_EROR.
> >
> > Now especially when running with batched IOTLB flushes for unmap it may
> > be that some IOVAs have already been invalidated but not yet synced via
> > .iotlb_sync_map. Thus if the hypervisor indicates running out of
> > resources, first do a global flush allowing the hypervisor to free
> > resources associated with these mappings and only if that also fails
> > report this error to callers.
> >
> > Signed-off-by: Niklas Schnelle <[email protected]>
> > ---
> Just a small typo, I noticed
> [...]
You mean the misspelled DMA_MAPPING_ERROR, right? Either way I did edit
the commit message for a bit more clarity on some of the details:
On s390 when using a paging hypervisor, .iotlb_sync_map is used to sync
mappings by letting the hypervisor inspect the synced IOVA range and
updating a shadow table. This however means that .iotlb_sync_map can
fail as the hypervisor may run out of resources while doing the sync.
This can be due to the hypervisor being unable to pin guest pages, due
to a limit on mapped addresses such as vfio_iommu_type1.dma_entry_limit
or lack of other resources. Either way such a failure to sync a mapping
should result in a DMA_MAPPING_ERROR.
Now especially when running with batched IOTLB flushes for unmap it may
be that some IOVAs have already been invalidated but not yet synced via
.iotlb_sync_map. Thus if the hypervisor indicates running out of
resources, first do a global flush allowing the hypervisor to free
resources associated with these mappings as well a retry creating the
new mappings and only if that also fails report this error to callers.
> > diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
> > index ed33c6cce083..6ba38b4f5b37 100644
> > --- a/drivers/iommu/s390-iommu.c
> > +++ b/drivers/iommu/s390-iommu.c
> > @@ -210,6 +210,14 @@ static void s390_iommu_release_device(struct device *dev)
> > __s390_iommu_detach_device(zdev);
> > }
> >
> > +
> > +static int zpci_refresh_all(struct zpci_dev *zdev)
> > +{
> > + return zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma,
> > + zdev->end_dma - zdev->start_dma + 1);
> > +
> > +}
> > +
> > static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain)
> > {
> > struct s390_domain *s390_domain = to_s390_domain(domain);
> > @@ -217,8 +225,7 @@ static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain)
> >
> > rcu_read_lock();
> > list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
> > - zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma,
> > - zdev->end_dma - zdev->start_dma + 1);
> > + zpci_refresh_all(zdev);
> > }
> > rcu_read_unlock();
> > }
> > @@ -242,20 +249,32 @@ static void s390_iommu_iotlb_sync(struct iommu_domain *domain,
> > rcu_read_unlock();
> > }
> >
> > -static void s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
> > +static int s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
> > unsigned long iova, size_t size)
> > {
> > struct s390_domain *s390_domain = to_s390_domain(domain);
> > struct zpci_dev *zdev;
> > + int ret = 0;
> >
> > rcu_read_lock();
> > list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
> > if (!zdev->tlb_refresh)
> > continue;
> > - zpci_refresh_trans((u64)zdev->fh << 32,
> > - iova, size);
> > + ret = zpci_refresh_trans((u64)zdev->fh << 32,
> > + iova, size);
> > + /*
> > + * let the hypervisor disover invalidated entries
> typo: s/disover/discover/g
> > + * allowing it to free IOVAs and unpin pages
> > + */
> > + if (ret == -ENOMEM) {
> > + ret = zpci_refresh_all(zdev);
> > + if (ret)
> > + break;
> > + }
> > }
> > rcu_read_unlock();
> > +
> > + return ret;
> > }
> >
> > static int s390_iommu_validate_trans(struct s390_domain *s390_domain,
> [...]
On Tue, Jan 03, 2023 at 09:16:22AM +0100, Niklas Schnelle wrote:
> On Mon, 2023-01-02 at 19:25 +0100, Alexandra Winter wrote:
> >
> > On 02.01.23 12:56, Niklas Schnelle wrote:
> > > On s390 .iotlb_sync_map is used to sync mappings to an underlying
> > > hypervisor by letting the hypervisor inspect the synced IOVA range and
> > > updating its shadow table. This however means that it can fail as the
> > > hypervisor may run out of resources. This can be due to the hypervisor
> > > being unable to pin guest pages, due to a limit on concurrently mapped
> > > addresses such as vfio_iommu_type1.dma_entry_limit or other resources.
> > > Either way such a failure to sync a mapping should result in
> > > a DMA_MAPPING_EROR.
> > >
> > > Now especially when running with batched IOTLB flushes for unmap it may
> > > be that some IOVAs have already been invalidated but not yet synced via
> > > .iotlb_sync_map. Thus if the hypervisor indicates running out of
> > > resources, first do a global flush allowing the hypervisor to free
> > > resources associated with these mappings and only if that also fails
> > > report this error to callers.
> > >
> > > Signed-off-by: Niklas Schnelle <[email protected]>
> > > ---
> > Just a small typo, I noticed
> > [...]
>
> You mean the misspelled DMA_MAPPING_ERROR, right? Either way I did edit
I think Alexandra meant the below:
> > > + /*
> > > + * let the hypervisor disover invalidated entries
> > typo: s/disover/discover/g
Now you know why I always complain when people do full quotes and not
trim replies to relevant parts.
It is sometimes very hard to spot comments :)
On Tue, 2023-01-03 at 09:16 +0100, Niklas Schnelle wrote:
> On Mon, 2023-01-02 at 19:25 +0100, Alexandra Winter wrote:
> >
> > On 02.01.23 12:56, Niklas Schnelle wrote:
> > > On s390 .iotlb_sync_map is used to sync mappings to an underlying
> > > hypervisor by letting the hypervisor inspect the synced IOVA range and
> > > updating its shadow table. This however means that it can fail as the
> > > hypervisor may run out of resources. This can be due to the hypervisor
> > > being unable to pin guest pages, due to a limit on concurrently mapped
> > > addresses such as vfio_iommu_type1.dma_entry_limit or other resources.
> > > Either way such a failure to sync a mapping should result in
> > > a DMA_MAPPING_EROR.
> > >
> > > Now especially when running with batched IOTLB flushes for unmap it may
> > > be that some IOVAs have already been invalidated but not yet synced via
> > > .iotlb_sync_map. Thus if the hypervisor indicates running out of
> > > resources, first do a global flush allowing the hypervisor to free
> > > resources associated with these mappings and only if that also fails
> > > report this error to callers.
> > >
> > > Signed-off-by: Niklas Schnelle <[email protected]>
> > > ---
> > Just a small typo, I noticed
> > [...]
>
> You mean the misspelled DMA_MAPPING_ERROR, right? Either way I did edit
> the commit message for a bit more clarity on some of the details:
>
> On s390 when using a paging hypervisor, .iotlb_sync_map is used to sync
> mappings by letting the hypervisor inspect the synced IOVA range and
> updating a shadow table. This however means that .iotlb_sync_map can
> fail as the hypervisor may run out of resources while doing the sync.
> This can be due to the hypervisor being unable to pin guest pages, due
> to a limit on mapped addresses such as vfio_iommu_type1.dma_entry_limit
> or lack of other resources. Either way such a failure to sync a mapping
> should result in a DMA_MAPPING_ERROR.
>
> Now especially when running with batched IOTLB flushes for unmap it may
> be that some IOVAs have already been invalidated but not yet synced via
> .iotlb_sync_map. Thus if the hypervisor indicates running out of
> resources, first do a global flush allowing the hypervisor to free
> resources associated with these mappings as well a retry creating the
> new mappings and only if that also fails report this error to callers.
>
>
>
> > > diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
> > > index ed33c6cce083..6ba38b4f5b37 100644
> > > --- a/drivers/iommu/s390-iommu.c
> > > +++ b/drivers/iommu/s390-iommu.c
> > > @@ -210,6 +210,14 @@ static void s390_iommu_release_device(struct device *dev)
> > > __s390_iommu_detach_device(zdev);
> > > }
> > >
> > > +
> > > +static int zpci_refresh_all(struct zpci_dev *zdev)
> > > +{
> > > + return zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma,
> > > + zdev->end_dma - zdev->start_dma + 1);
> > > +
> > > +}
> > > +
> > > static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain)
> > > {
> > > struct s390_domain *s390_domain = to_s390_domain(domain);
> > > @@ -217,8 +225,7 @@ static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain)
> > >
> > > rcu_read_lock();
> > > list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
> > > - zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma,
> > > - zdev->end_dma - zdev->start_dma + 1);
> > > + zpci_refresh_all(zdev);
> > > }
> > > rcu_read_unlock();
> > > }
> > > @@ -242,20 +249,32 @@ static void s390_iommu_iotlb_sync(struct iommu_domain *domain,
> > > rcu_read_unlock();
> > > }
> > >
> > > -static void s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
> > > +static int s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
> > > unsigned long iova, size_t size)
> > > {
> > > struct s390_domain *s390_domain = to_s390_domain(domain);
> > > struct zpci_dev *zdev;
> > > + int ret = 0;
> > >
> > > rcu_read_lock();
> > > list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
> > > if (!zdev->tlb_refresh)
> > > continue;
> > > - zpci_refresh_trans((u64)zdev->fh << 32,
> > > - iova, size);
> > > + ret = zpci_refresh_trans((u64)zdev->fh << 32,
> > > + iova, size);
> > > + /*
> > > + * let the hypervisor disover invalidated entries
> > typo: s/disover/discover/g
I'm blind, missed this one. Added the change now.
> > > + * allowing it to free IOVAs and unpin pages
> > > + */
> > > + if (ret == -ENOMEM) {
> > > + ret = zpci_refresh_all(zdev);
> > > + if (ret)
> > > + break;
> > > + }
> > > }
> > > rcu_read_unlock();
> > > +
> > > + return ret;
> > > }
> > >
> > > static int s390_iommu_validate_trans(struct s390_domain *s390_domain,
> > [...]
>
On Mon, 2023-01-02 at 12:56 +0100, Niklas Schnelle wrote:
> On s390 .iotlb_sync_map is used to sync mappings to an underlying
> hypervisor by letting the hypervisor inspect the synced IOVA range and
> updating its shadow table. This however means that it can fail as the
> hypervisor may run out of resources. This can be due to the hypervisor
> being unable to pin guest pages, due to a limit on concurrently mapped
> addresses such as vfio_iommu_type1.dma_entry_limit or other resources.
> Either way such a failure to sync a mapping should result in
> a DMA_MAPPING_EROR.
>
> Now especially when running with batched IOTLB flushes for unmap it may
> be that some IOVAs have already been invalidated but not yet synced via
> .iotlb_sync_map. Thus if the hypervisor indicates running out of
> resources, first do a global flush allowing the hypervisor to free
> resources associated with these mappings and only if that also fails
> report this error to callers.
>
> Signed-off-by: Niklas Schnelle <[email protected]>
> ---
> drivers/iommu/amd/iommu.c | 5 +++--
> drivers/iommu/apple-dart.c | 5 +++--
> drivers/iommu/intel/iommu.c | 5 +++--
> drivers/iommu/iommu.c | 20 ++++++++++++++++----
> drivers/iommu/msm_iommu.c | 5 +++--
> drivers/iommu/mtk_iommu.c | 5 +++--
> drivers/iommu/s390-iommu.c | 29 ++++++++++++++++++++++++-----
> drivers/iommu/sprd-iommu.c | 5 +++--
> drivers/iommu/tegra-gart.c | 5 +++--
> include/linux/iommu.h | 4 ++--
> 10 files changed, 63 insertions(+), 25 deletions(-)
Ok kernel test robot reported that I missed an implementation of
.iotlb_sync_map in drivers/iommu/sun50i-iommu.c during rebase as that
was only added in v6.2-rc1 by commit e563cc0c787c85 ("iommu/sun50i:
Implement .iotlb_sync_map"). Will add and send a v4 including the
proposed commit message rewording too.
>
> diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
> index cbeaab55c0db..3df7d20e0e52 100644
> --- a/drivers/iommu/amd/iommu.c
> +++ b/drivers/iommu/amd/iommu.c
> @@ -2180,14 +2180,15 @@ static int amd_iommu_attach_device(struct iommu_domain *dom,
> return ret;
> }
>
> -static void amd_iommu_iotlb_sync_map(struct iommu_domain *dom,
> - unsigned long iova, size_t size)
---8<---