linux-kernel - [PATCH 1/3] iommu/arm-smmu: Move to bitmap for arm_smmu

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Date:   Mon, 21 Jan 2019 11:23:33 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     will.deacon@....com, robin.murphy@....com, joro@...tes.org,
        iommu@...ts.linux-foundation.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, tfiga@...omium.org,
        pratikp@...eaurora.org, pdaly@...eaurora.org,
        jcrouse@...eaurora.org, Vivek Gautam <vivek.gautam@...eaurora.org>
Subject: [PATCH 1/3] iommu/arm-smmu: Move to bitmap for arm_smmu_domain atrributes

A number of arm_smmu_domain's attributes can be assigned based
on the iommu domains's attributes. These local attributes better
be managed by a bitmap.
So remove boolean flags and move to a 32-bit bitmap, and enable
each bits separtely.

Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
---
 drivers/iommu/arm-smmu.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 7ebbcf1b2eb3..52b300dfc096 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -257,10 +257,11 @@ 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;
+#define ARM_SMMU_DOMAIN_ATTR_NON_STRICT	BIT(0)
+	unsigned int			attr;
 };
 
 struct arm_smmu_option_prop {
@@ -901,7 +902,7 @@ 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)
+	if (smmu_domain->attr & ARM_SMMU_DOMAIN_ATTR_NON_STRICT)
 		pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
 
 	/* Non coherent page table mappings only for Stage-1 */
@@ -1598,7 +1599,8 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
 	case IOMMU_DOMAIN_DMA:
 		switch (attr) {
 		case DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE:
-			*(int *)data = smmu_domain->non_strict;
+			*(int *)data = !!(smmu_domain->attr &
+					  ARM_SMMU_DOMAIN_ATTR_NON_STRICT);
 			return 0;
 		default:
 			return -ENODEV;
@@ -1638,7 +1640,7 @@ 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;
+			smmu_domain->attr |= ARM_SMMU_DOMAIN_ATTR_NON_STRICT;
 			break;
 		default:
 			ret = -ENODEV;
-- 
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