[PATCH 15/17] iommu: remove DOMAIN_ATTR_NESTING
Christoph Hellwig
hch at lst.de
Mon Mar 1 08:42:55 GMT 2021
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 40 ++++++---------------
drivers/iommu/arm/arm-smmu/arm-smmu.c | 30 ++++++++++------
drivers/iommu/intel/iommu.c | 28 +++++----------
drivers/iommu/iommu.c | 8 +++++
drivers/vfio/vfio_iommu_type1.c | 5 +--
include/linux/iommu.h | 4 ++-
6 files changed, 50 insertions(+), 65 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index bf96172e8c1f71..8e6fee3ea454d3 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2466,41 +2466,21 @@ static void arm_smmu_dma_enable_flush_queue(struct iommu_domain *domain)
to_smmu_domain(domain)->non_strict = true;
}
-static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
- enum iommu_attr attr, void *data)
+static int arm_smmu_domain_enable_nesting(struct iommu_domain *domain)
{
- int ret = 0;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ int ret = -EPERM;
- mutex_lock(&smmu_domain->init_mutex);
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+ return -EINVAL;
- switch (domain->type) {
- case IOMMU_DOMAIN_UNMANAGED:
- switch (attr) {
- case DOMAIN_ATTR_NESTING:
- if (smmu_domain->smmu) {
- ret = -EPERM;
- goto out_unlock;
- }
-
- if (*(int *)data)
- smmu_domain->stage = ARM_SMMU_DOMAIN_NESTED;
- else
- smmu_domain->stage = ARM_SMMU_DOMAIN_S1;
- break;
- default:
- ret = -ENODEV;
- }
- break;
- case IOMMU_DOMAIN_DMA:
- ret = -ENODEV;
- break;
- default:
- ret = -EINVAL;
+ mutex_lock(&smmu_domain->init_mutex);
+ if (!smmu_domain->smmu) {
+ smmu_domain->stage = ARM_SMMU_DOMAIN_NESTED;
+ ret = 0;
}
-
-out_unlock:
mutex_unlock(&smmu_domain->init_mutex);
+
return ret;
}
@@ -2603,7 +2583,7 @@ static struct iommu_ops arm_smmu_ops = {
.device_group = arm_smmu_device_group,
.dma_use_flush_queue = arm_smmu_dma_use_flush_queue,
.dma_enable_flush_queue = arm_smmu_dma_enable_flush_queue,
- .domain_set_attr = arm_smmu_domain_set_attr,
+ .domain_enable_nesting = arm_smmu_domain_enable_nesting,
.of_xlate = arm_smmu_of_xlate,
.get_resv_regions = arm_smmu_get_resv_regions,
.put_resv_regions = generic_iommu_put_resv_regions,
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index e7893e96f5177a..2e17d990d04481 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1497,6 +1497,24 @@ static void arm_smmu_dma_enable_flush_queue(struct iommu_domain *domain)
to_smmu_domain(domain)->pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
}
+static int arm_smmu_domain_enable_nesting(struct iommu_domain *domain)
+{
+ struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ int ret = -EPERM;
+
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+ return -EINVAL;
+
+ mutex_lock(&smmu_domain->init_mutex);
+ if (!smmu_domain->smmu) {
+ smmu_domain->stage = ARM_SMMU_DOMAIN_NESTED;
+ ret = 0;
+ }
+ mutex_unlock(&smmu_domain->init_mutex);
+
+ return ret;
+}
+
static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
@@ -1508,17 +1526,6 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
switch(domain->type) {
case IOMMU_DOMAIN_UNMANAGED:
switch (attr) {
- case DOMAIN_ATTR_NESTING:
- if (smmu_domain->smmu) {
- ret = -EPERM;
- goto out_unlock;
- }
-
- if (*(int *)data)
- smmu_domain->stage = ARM_SMMU_DOMAIN_NESTED;
- else
- smmu_domain->stage = ARM_SMMU_DOMAIN_S1;
- break;
case DOMAIN_ATTR_IO_PGTABLE_CFG: {
struct io_pgtable_domain_attr *pgtbl_cfg = data;
@@ -1603,6 +1610,7 @@ static struct iommu_ops arm_smmu_ops = {
.dma_use_flush_queue = arm_smmu_dma_use_flush_queue,
.dma_enable_flush_queue = arm_smmu_dma_enable_flush_queue,
.domain_set_attr = arm_smmu_domain_set_attr,
+ .domain_enable_nesting = arm_smmu_domain_enable_nesting,
.of_xlate = arm_smmu_of_xlate,
.get_resv_regions = arm_smmu_get_resv_regions,
.put_resv_regions = generic_iommu_put_resv_regions,
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index eaa80c33f4bc91..0f1374d6612a60 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -5423,32 +5423,22 @@ static bool intel_iommu_is_attach_deferred(struct iommu_domain *domain,
}
static int
-intel_iommu_domain_set_attr(struct iommu_domain *domain,
- enum iommu_attr attr, void *data)
+intel_iommu_domain_enable_nesting(struct iommu_domain *domain)
{
struct dmar_domain *dmar_domain = to_dmar_domain(domain);
unsigned long flags;
- int ret = 0;
+ int ret = -ENODEV;
if (domain->type != IOMMU_DOMAIN_UNMANAGED)
return -EINVAL;
- switch (attr) {
- case DOMAIN_ATTR_NESTING:
- spin_lock_irqsave(&device_domain_lock, flags);
- if (nested_mode_support() &&
- list_empty(&dmar_domain->devices)) {
- dmar_domain->flags |= DOMAIN_FLAG_NESTING_MODE;
- dmar_domain->flags &= ~DOMAIN_FLAG_USE_FIRST_LEVEL;
- } else {
- ret = -ENODEV;
- }
- spin_unlock_irqrestore(&device_domain_lock, flags);
- break;
- default:
- ret = -EINVAL;
- break;
+ spin_lock_irqsave(&device_domain_lock, flags);
+ if (nested_mode_support() && list_empty(&dmar_domain->devices)) {
+ dmar_domain->flags |= DOMAIN_FLAG_NESTING_MODE;
+ dmar_domain->flags &= ~DOMAIN_FLAG_USE_FIRST_LEVEL;
+ ret = 0;
}
+ spin_unlock_irqrestore(&device_domain_lock, flags);
return ret;
}
@@ -5556,7 +5546,7 @@ const struct iommu_ops intel_iommu_ops = {
.domain_alloc = intel_iommu_domain_alloc,
.domain_free = intel_iommu_domain_free,
.dma_use_flush_queue = intel_iommu_dma_use_flush_queue,
- .domain_set_attr = intel_iommu_domain_set_attr,
+ .domain_enable_nesting = intel_iommu_domain_enable_nesting,
.attach_dev = intel_iommu_attach_device,
.detach_dev = intel_iommu_detach_device,
.aux_attach_dev = intel_iommu_aux_attach_device,
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 0f12c4d58cdc42..2e9e058501a953 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2685,6 +2685,14 @@ int iommu_domain_set_attr(struct iommu_domain *domain,
}
EXPORT_SYMBOL_GPL(iommu_domain_set_attr);
+int iommu_domain_enable_nesting(struct iommu_domain *domain)
+{
+ if (!domain->ops->domain_enable_nesting)
+ return -EINVAL;
+ return domain->ops->domain_enable_nesting(domain);
+}
+EXPORT_SYMBOL_GPL(iommu_domain_enable_nesting);
+
void iommu_get_resv_regions(struct device *dev, struct list_head *list)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index c8e57f22f421c5..9cea4d80dd66ed 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -2320,10 +2320,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
}
if (iommu->nesting) {
- int attr = 1;
-
- ret = iommu_domain_set_attr(domain->domain, DOMAIN_ATTR_NESTING,
- &attr);
+ ret = iommu_domain_enable_nesting(domain->domain);
if (ret)
goto out_domain;
}
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index f30de33c6ff56e..aed88aa3bd3edf 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -107,7 +107,6 @@ enum iommu_cap {
*/
enum iommu_attr {
- DOMAIN_ATTR_NESTING, /* two stages of translation */
DOMAIN_ATTR_IO_PGTABLE_CFG,
DOMAIN_ATTR_MAX,
};
@@ -196,6 +195,7 @@ struct iommu_iotlb_gather {
* @dma_use_flush_queue: Returns %true if a DMA flush queue is used
* @dma_enable_flush_queue: Try to enable the DMA flush queue
* @domain_set_attr: Change domain attributes
+ * @domain_enable_nesting: Enable nesting
* @get_resv_regions: Request list of reserved regions for a device
* @put_resv_regions: Free list of reserved regions for a device
* @apply_resv_region: Temporary helper call-back for iova reserved ranges
@@ -248,6 +248,7 @@ struct iommu_ops {
void (*dma_enable_flush_queue)(struct iommu_domain *domain);
int (*domain_set_attr)(struct iommu_domain *domain,
enum iommu_attr attr, void *data);
+ int (*domain_enable_nesting)(struct iommu_domain *domain);
/* Request/Free a list of reserved regions for a device */
void (*get_resv_regions)(struct device *dev, struct list_head *list);
@@ -494,6 +495,7 @@ extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
bool iommu_dma_use_flush_queue(struct iommu_domain *domain);
extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
void *data);
+int iommu_domain_enable_nesting(struct iommu_domain *domain);
extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
unsigned long iova, int flags);
--
2.29.2
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