linux-kernel - [PATCH v4 3/8] iommu/arm-smmu-v3: Encapsulate ctx_desc_cfg init in alloc_cd

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Message-ID: <20230803003234.v4.3.I875254464d044a8ce8b3a2ad6beb655a4a006456@changeid>
Date:   Thu,  3 Aug 2023 00:32:31 +0800
From:   Michael Shavit <mshavit@...gle.com>
To:     iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     will@...nel.org, robin.murphy@....com, nicolinc@...dia.com,
        jgg@...dia.com, jean-philippe@...aro.org,
        Michael Shavit <mshavit@...gle.com>
Subject: [PATCH v4 3/8] iommu/arm-smmu-v3: Encapsulate ctx_desc_cfg init in alloc_cd_tables

This is slighlty cleaner: arm_smmu_ctx_desc_cfg is initialized in a
single function instead of having pieces set ahead-of time by its caller.

Signed-off-by: Michael Shavit <mshavit@...gle.com>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
---

(no changes since v1)

 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 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 ded613aedbb0..fe4b19c3b8de 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1132,7 +1132,8 @@ 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_alloc_cd_tables(struct arm_smmu_domain *smmu_domain,
+				    struct arm_smmu_master *master)
 {
 	int ret;
 	size_t l1size;
@@ -1140,6 +1141,7 @@ static int arm_smmu_alloc_cd_tables(struct arm_smmu_domain *smmu_domain)
 	struct arm_smmu_device *smmu = smmu_domain->smmu;
 	struct arm_smmu_ctx_desc_cfg *cdcfg = &smmu_domain->cd_table;
 
+	cdcfg->max_cds_bits = master->ssid_bits;
 	max_contexts = 1 << cdcfg->max_cds_bits;
 
 	if (!(smmu->features & ARM_SMMU_FEAT_2_LVL_CDTAB) ||
@@ -2107,7 +2109,6 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
 	int ret;
 	u32 asid;
 	struct arm_smmu_device *smmu = smmu_domain->smmu;
-	struct arm_smmu_ctx_desc_cfg *cd_table = &smmu_domain->cd_table;
 	struct arm_smmu_ctx_desc *cd = &smmu_domain->cd;
 	typeof(&pgtbl_cfg->arm_lpae_s1_cfg.tcr) tcr = &pgtbl_cfg->arm_lpae_s1_cfg.tcr;
 
@@ -2120,11 +2121,9 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
 	if (ret)
 		goto out_unlock;
 
-	cd_table->max_cds_bits = master->ssid_bits;
-
 	smmu_domain->stall_enabled = master->stall_enabled;
 
-	ret = arm_smmu_alloc_cd_tables(smmu_domain);
+	ret = arm_smmu_alloc_cd_tables(smmu_domain, master);
 	if (ret)
 		goto out_free_asid;
 
-- 
2.41.0.585.gd2178a4bd4-goog