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Subject[PATCH v7 5/6] iommu/arm-smmu-v3: Add support for non-strict mode
Date
From: Zhen Lei <thunder.leizhen@huawei.com>

Dynamically choose strict or non-strict mode for page table config based
on the iommu domain type.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
[rm: convert to domain attribute]
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/arm-smmu-v3.c | 30 ++++++++++++++++++++++++------
1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index f10c852479fc..7bbfa5f7ce8e 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -612,6 +612,7 @@ struct arm_smmu_domain {
struct mutex init_mutex; /* Protects smmu pointer */

struct io_pgtable_ops *pgtbl_ops;
+ bool non_strict;

enum arm_smmu_domain_stage stage;
union {
@@ -1633,6 +1634,9 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain)
if (smmu->features & ARM_SMMU_FEAT_COHERENCY)
pgtbl_cfg.quirks = IO_PGTABLE_QUIRK_NO_DMA;

+ if (smmu_domain->non_strict)
+ pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
+
pgtbl_ops = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, smmu_domain);
if (!pgtbl_ops)
return -ENOMEM;
@@ -1934,13 +1938,17 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
{
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);

- if (domain->type != IOMMU_DOMAIN_UNMANAGED)
- return -EINVAL;
-
switch (attr) {
case DOMAIN_ATTR_NESTING:
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+ return -EINVAL;
*(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED);
return 0;
+ case DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE:
+ if (domain->type != IOMMU_DOMAIN_DMA)
+ return -EINVAL;
+ *(int *)data = smmu_domain->non_strict;
+ return 0;
default:
return -ENODEV;
}
@@ -1952,13 +1960,15 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
int ret = 0;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);

- if (domain->type != IOMMU_DOMAIN_UNMANAGED)
- return -EINVAL;
-
mutex_lock(&smmu_domain->init_mutex);

switch (attr) {
case DOMAIN_ATTR_NESTING:
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
if (smmu_domain->smmu) {
ret = -EPERM;
goto out_unlock;
@@ -1969,6 +1979,14 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
else
smmu_domain->stage = ARM_SMMU_DOMAIN_S1;

+ break;
+ case DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE:
+ if (domain->type != IOMMU_DOMAIN_DMA) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ smmu_domain->non_strict = *(int *)data;
break;
default:
ret = -ENODEV;
--
2.19.0.dirty
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