linux-kernel - [PATCH v3 02/13] iommu/arm-smmu-v3: Add smmu_s1_cfg to smmu

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Message-ID: <20230614154304.2860121-3-mshavit@google.com>
Date:   Wed, 14 Jun 2023 23:41:54 +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 02/13] iommu/arm-smmu-v3: Add smmu_s1_cfg to smmu_master

Except for Nested domains, arm_smmu_master will own the STEs that are
inserted into the arm_smmu_device's STE table.

Signed-off-by: Michael Shavit <mshavit@...gle.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 28 +++++++++++++--------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  1 +
 2 files changed, 18 insertions(+), 11 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 beff04b897718..023769f5ca79a 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1126,15 +1126,16 @@ int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain, int ssid,
 	return 0;
 }
 
-static int arm_smmu_alloc_cd_tables(struct arm_smmu_domain *smmu_domain)
+static int arm_smmu_init_s1_cfg(struct arm_smmu_master *master,
+				struct arm_smmu_s1_cfg *cfg)
 {
 	int ret;
 	size_t l1size;
 	size_t max_contexts;
-	struct arm_smmu_device *smmu = smmu_domain->smmu;
-	struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
+	struct arm_smmu_device *smmu = master->smmu;
 	struct arm_smmu_ctx_desc_cfg *cdcfg = &cfg->cdcfg;
 
+	cfg->s1cdmax = master->ssid_bits;
 	max_contexts = 1 << cfg->s1cdmax;
 
 	if (!(smmu->features & ARM_SMMU_FEAT_2_LVL_CDTAB) ||
@@ -1175,12 +1176,11 @@ static int arm_smmu_alloc_cd_tables(struct arm_smmu_domain *smmu_domain)
 	return ret;
 }
 
-static void arm_smmu_free_cd_tables(struct arm_smmu_domain *smmu_domain)
+static void arm_smmu_free_cd_tables(struct arm_smmu_device *smmu,
+				    struct arm_smmu_ctx_desc_cfg *cdcfg)
 {
 	int i;
 	size_t size, l1size;
-	struct arm_smmu_device *smmu = smmu_domain->smmu;
-	struct arm_smmu_ctx_desc_cfg *cdcfg = &smmu_domain->s1_cfg.cdcfg;
 
 	if (cdcfg->l1_desc) {
 		size = CTXDESC_L2_ENTRIES * (CTXDESC_CD_DWORDS << 3);
@@ -2076,7 +2076,7 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
 		/* Prevent SVA from touching the CD while we're freeing it */
 		mutex_lock(&arm_smmu_asid_lock);
 		if (cfg->cdcfg.cdtab)
-			arm_smmu_free_cd_tables(smmu_domain);
+			arm_smmu_free_cd_tables(smmu, &cfg->cdcfg);
 		arm_smmu_free_asid(&smmu_domain->cd);
 		mutex_unlock(&arm_smmu_asid_lock);
 	} else {
@@ -2108,11 +2108,9 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
 	if (ret)
 		goto out_unlock;
 
-	cfg->s1cdmax = master->ssid_bits;
-
 	smmu_domain->stall_enabled = master->stall_enabled;
 
-	ret = arm_smmu_alloc_cd_tables(smmu_domain);
+	ret = arm_smmu_init_s1_cfg(master, cfg);
 	if (ret)
 		goto out_free_asid;
 
@@ -2140,7 +2138,7 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
 	return 0;
 
 out_free_cd_tables:
-	arm_smmu_free_cd_tables(smmu_domain);
+	arm_smmu_free_cd_tables(smmu, &cfg->cdcfg);
 out_free_asid:
 	arm_smmu_free_asid(cd);
 out_unlock:
@@ -2704,6 +2702,13 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev)
 	    smmu->features & ARM_SMMU_FEAT_STALL_FORCE)
 		master->stall_enabled = true;
 
+	ret = arm_smmu_init_s1_cfg(master, &master->owned_s1_cfg);
+	if (ret) {
+		arm_smmu_disable_pasid(master);
+		arm_smmu_remove_master(master);
+		goto err_free_master;
+	}
+
 	return &smmu->iommu;
 
 err_free_master:
@@ -2719,6 +2724,7 @@ static void arm_smmu_release_device(struct device *dev)
 	if (WARN_ON(arm_smmu_master_sva_enabled(master)))
 		iopf_queue_remove_device(master->smmu->evtq.iopf, dev);
 	arm_smmu_detach_dev(master);
+	arm_smmu_free_cd_tables(master->smmu, &master->owned_s1_cfg.cdcfg);
 	arm_smmu_disable_pasid(master);
 	arm_smmu_remove_master(master);
 	kfree(master);
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 68d519f21dbd8..053cc14c23969 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -688,6 +688,7 @@ struct arm_smmu_master {
 	struct arm_smmu_domain		*domain;
 	struct list_head		domain_head;
 	struct arm_smmu_stream		*streams;
+	struct arm_smmu_s1_cfg		owned_s1_cfg;
 	unsigned int			num_streams;
 	bool				ats_enabled;
 	bool				stall_enabled;
-- 
2.41.0.162.gfafddb0af9-goog