iommu/arm-smmu: Move non-strict mode to use io_pgtable_domain_attr

Now that we have a struct io_pgtable_domain_attr with quirks,
use that for non_strict mode as well thereby removing the need
for more members of arm_smmu_domain in the future.

Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Link: https://lore.kernel.org/r/c191265f3db1f6b3e136d4057ca917666680a066.1606287059.git.saiprakash.ranjan@codeaurora.org
Signed-off-by: Will Deacon <will@kernel.org>

drivers/iommu/arm/arm-smmu/arm-smmu.c

@@ -786,9 +786,6 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
 			goto out_clear_smmu;
 	}
 
-	if (smmu_domain->non_strict)
-		pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
-
 	if (smmu_domain->pgtbl_cfg.quirks)
 		pgtbl_cfg.quirks |= smmu_domain->pgtbl_cfg.quirks;
 
@@ -1526,9 +1523,12 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
 		break;
 	case IOMMU_DOMAIN_DMA:
 		switch (attr) {
-		case DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE:
-			*(int *)data = smmu_domain->non_strict;
+		case DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE: {
+			bool non_strict = smmu_domain->pgtbl_cfg.quirks &
+					  IO_PGTABLE_QUIRK_NON_STRICT;
+			*(int *)data = non_strict;
 			return 0;
+		}
 		default:
 			return -ENODEV;
 		}
@@ -1578,7 +1578,10 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
 	case IOMMU_DOMAIN_DMA:
 		switch (attr) {
 		case DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE:
-			smmu_domain->non_strict = *(int *)data;
+			if (*(int *)data)
+				smmu_domain->pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
+			else
+				smmu_domain->pgtbl_cfg.quirks &= ~IO_PGTABLE_QUIRK_NON_STRICT;
 			break;
 		default:
 			ret = -ENODEV;

drivers/iommu/arm/arm-smmu/arm-smmu.h

@@ -368,7 +368,6 @@ struct arm_smmu_domain {
 	const struct iommu_flush_ops	*flush_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;