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Subject[PATCH v7 6/6] iommu/arm-smmu: Support non-strict mode
Date
All we need is to wire up .flush_iotlb_all properly and implement the
domain attribute, and iommu-dma and io-pgtable-arm will do the rest for
us. Rather than bother implementing it for v7s format for the highly
unlikely chance of that being relevant, we can simply hide the
non-strict flag from io-pgtable for that combination just so anyone who
does actually try it will simply get over-invalidation instead of
failure to initialise domains.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/arm-smmu.c | 40 +++++++++++++++++++++++++++++++++-------
1 file changed, 33 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index fd1b80ef9490..aa5be334753b 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -246,6 +246,7 @@ struct arm_smmu_domain {
const struct iommu_gather_ops *tlb_ops;
struct arm_smmu_cfg cfg;
enum arm_smmu_domain_stage stage;
+ bool non_strict;
struct mutex init_mutex; /* Protects smmu pointer */
spinlock_t cb_lock; /* Serialises ATS1* ops and TLB syncs */
struct iommu_domain domain;
@@ -863,6 +864,9 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
if (smmu->features & ARM_SMMU_FEAT_COHERENT_WALK)
pgtbl_cfg.quirks = IO_PGTABLE_QUIRK_NO_DMA;

+ if (smmu_domain->non_strict && cfg->fmt != ARM_SMMU_CTX_FMT_AARCH32_S)
+ pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
+
smmu_domain->smmu = smmu;
pgtbl_ops = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, smmu_domain);
if (!pgtbl_ops) {
@@ -1252,6 +1256,14 @@ static size_t arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
return ops->unmap(ops, iova, size);
}

+static void arm_smmu_flush_iotlb_all(struct iommu_domain *domain)
+{
+ struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+
+ if (smmu_domain->tlb_ops)
+ smmu_domain->tlb_ops->tlb_flush_all(smmu_domain);
+}
+
static void arm_smmu_iotlb_sync(struct iommu_domain *domain)
{
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
@@ -1470,13 +1482,17 @@ 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;
}
@@ -1488,13 +1504,15 @@ 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;
@@ -1505,6 +1523,14 @@ 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;
@@ -1562,7 +1588,7 @@ static struct iommu_ops arm_smmu_ops = {
.attach_dev = arm_smmu_attach_dev,
.map = arm_smmu_map,
.unmap = arm_smmu_unmap,
- .flush_iotlb_all = arm_smmu_iotlb_sync,
+ .flush_iotlb_all = arm_smmu_flush_iotlb_all,
.iotlb_sync = arm_smmu_iotlb_sync,
.iova_to_phys = arm_smmu_iova_to_phys,
.add_device = arm_smmu_add_device,
--
2.19.0.dirty
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