linux-kernel - [PATCH v6 4/6] iommu/arm-smmu-v3: Make __arm_smmu_cmdq_skip

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Date: Mon, 29 Apr 2024 21:43:47 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <will@...nel.org>, <robin.murphy@....com>
CC: <joro@...tes.org>, <jgg@...dia.com>, <thierry.reding@...il.com>,
	<vdumpa@...dia.com>, <jonathanh@...dia.com>, <linux-kernel@...r.kernel.org>,
	<iommu@...ts.linux.dev>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-tegra@...r.kernel.org>
Subject: [PATCH v6 4/6] iommu/arm-smmu-v3: Make __arm_smmu_cmdq_skip_err reusable

Allow __arm_smmu_cmdq_skip_err function to be reused by NVIDIA Tegra241
CMDQV unit since it will use the same data structure for q. And include
the CMDQ_QUIRK_SYNC_CS_NONE_ONLY quirk when inserting a CMD_SYNC.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 7 +++++--
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 2 ++
 2 files changed, 7 insertions(+), 2 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 538850059bdd..5111859347d5 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -379,8 +379,8 @@ static void arm_smmu_cmdq_build_sync_cmd(u64 *cmd, struct arm_smmu_device *smmu,
 	arm_smmu_cmdq_build_cmd(cmd, &ent);
 }
 
-static void __arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu,
-				     struct arm_smmu_queue *q)
+void __arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu,
+			      struct arm_smmu_queue *q)
 {
 	static const char * const cerror_str[] = {
 		[CMDQ_ERR_CERROR_NONE_IDX]	= "No error",
@@ -428,6 +428,9 @@ static void __arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu,
 	for (i = 0; i < ARRAY_SIZE(cmd); ++i)
 		dev_err(smmu->dev, "\t0x%016llx\n", (unsigned long long)cmd[i]);
 
+	if (q->quirks & CMDQ_QUIRK_SYNC_CS_NONE_ONLY)
+		cmd_sync.sync.cs_none = true;
+
 	/* Convert the erroneous command into a CMD_SYNC */
 	arm_smmu_cmdq_build_cmd(cmd, &cmd_sync);
 
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 ab2824e46ac5..32e7fc5e1794 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -762,6 +762,8 @@ int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
 
 int arm_smmu_cmdq_init(struct arm_smmu_device *smmu,
 		       struct arm_smmu_cmdq *cmdq);
+void __arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu,
+			      struct arm_smmu_queue *q);
 
 #ifdef CONFIG_ARM_SMMU_V3_SVA
 bool arm_smmu_sva_supported(struct arm_smmu_device *smmu);
-- 
2.43.0