linux-kernel - [PATCH v3 03/13] iommu/arm-smmu-v3: Refactor write_strtab

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Message-ID: <20230614154304.2860121-4-mshavit@google.com>
Date:   Wed, 14 Jun 2023 23:41:55 +0800
From:   Michael Shavit <mshavit@...gle.com>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>
Cc:     Michael Shavit <mshavit@...gle.com>, jean-philippe@...aro.org,
        nicolinc@...dia.com, jgg@...dia.com, baolu.lu@...ux.intel.com,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 03/13] iommu/arm-smmu-v3: Refactor write_strtab_ent

Explicity keep track of the s1_cfg and s2_cfg that are attached to a
master in arm_smmu_master, regardless of whether they are owned by
arm_smmu_master, arm_smmu_domain or userspace.

Signed-off-by: Michael Shavit <mshavit@...gle.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 37 +++++++++------------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  2 ++
 2 files changed, 17 insertions(+), 22 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 023769f5ca79a..d79c6ef5d6ed4 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1269,10 +1269,9 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_master *master, u32 sid,
 	 */
 	u64 val = le64_to_cpu(dst[0]);
 	bool ste_live = false;
-	struct arm_smmu_device *smmu = NULL;
+	struct arm_smmu_device *smmu = master->smmu;
 	struct arm_smmu_s1_cfg *s1_cfg = NULL;
 	struct arm_smmu_s2_cfg *s2_cfg = NULL;
-	struct arm_smmu_domain *smmu_domain = NULL;
 	struct arm_smmu_cmdq_ent prefetch_cmd = {
 		.opcode		= CMDQ_OP_PREFETCH_CFG,
 		.prefetch	= {
@@ -1280,24 +1279,10 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_master *master, u32 sid,
 		},
 	};
 
-	if (master) {
-		smmu_domain = master->domain;
-		smmu = master->smmu;
-	}
-
-	if (smmu_domain) {
-		switch (smmu_domain->stage) {
-		case ARM_SMMU_DOMAIN_S1:
-			s1_cfg = &smmu_domain->s1_cfg;
-			break;
-		case ARM_SMMU_DOMAIN_S2:
-		case ARM_SMMU_DOMAIN_NESTED:
-			s2_cfg = &smmu_domain->s2_cfg;
-			break;
-		default:
-			break;
-		}
-	}
+	if (master->s1_cfg)
+		s1_cfg = master->s1_cfg;
+	else if (master->s2_cfg)
+		s2_cfg = master->s2_cfg;
 
 	if (val & STRTAB_STE_0_V) {
 		switch (FIELD_GET(STRTAB_STE_0_CFG, val)) {
@@ -1319,8 +1304,8 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_master *master, u32 sid,
 	val = STRTAB_STE_0_V;
 
 	/* Bypass/fault */
-	if (!smmu_domain || !(s1_cfg || s2_cfg)) {
-		if (!smmu_domain && disable_bypass)
+	if (!(s1_cfg || s2_cfg)) {
+		if (disable_bypass)
 			val |= FIELD_PREP(STRTAB_STE_0_CFG, STRTAB_STE_0_CFG_ABORT);
 		else
 			val |= FIELD_PREP(STRTAB_STE_0_CFG, STRTAB_STE_0_CFG_BYPASS);
@@ -2401,6 +2386,8 @@ static void arm_smmu_detach_dev(struct arm_smmu_master *master)
 
 	master->domain = NULL;
 	master->ats_enabled = false;
+	master->s1_cfg = NULL;
+	master->s2_cfg = NULL;
 	arm_smmu_install_ste_for_dev(master);
 }
 
@@ -2454,6 +2441,12 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 	}
 
 	master->domain = smmu_domain;
+	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
+		master->s1_cfg = &smmu_domain->s1_cfg;
+	} else if (smmu_domain->stage == ARM_SMMU_DOMAIN_S2 ||
+		   smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED) {
+		master->s2_cfg = &smmu_domain->s2_cfg;
+	}
 
 	/*
 	 * The SMMU does not support enabling ATS with bypass. When the STE is
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 053cc14c23969..3c614fbe2b8b9 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -689,6 +689,8 @@ struct arm_smmu_master {
 	struct list_head		domain_head;
 	struct arm_smmu_stream		*streams;
 	struct arm_smmu_s1_cfg		owned_s1_cfg;
+	struct arm_smmu_s1_cfg		*s1_cfg;
+	struct arm_smmu_s2_cfg		*s2_cfg;
 	unsigned int			num_streams;
 	bool				ats_enabled;
 	bool				stall_enabled;
-- 
2.41.0.162.gfafddb0af9-goog