linux-kernel - [PATCH v4 3/6] iommu/arm-smmu-v3: Make __arm_smmu_cmdq_skip

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Message-ID: <ba09af875d76827961e22164e5fd239824c10f92.1711690673.git.nicolinc@nvidia.com>
Date: Thu, 28 Mar 2024 23:14:07 -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 v4 3/6] 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.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 16 +++++++++-------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  1 +
 2 files changed, 10 insertions(+), 7 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 44fcc0c0a149..6cb20bff5a8a 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 +379,7 @@ 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 device *dev, struct arm_smmu_queue *q)
 {
 	static const char * const cerror_str[] = {
 		[CMDQ_ERR_CERROR_NONE_IDX]	= "No error",
@@ -397,12 +396,12 @@ static void __arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu,
 		.opcode = CMDQ_OP_CMD_SYNC,
 	};
 
-	dev_err(smmu->dev, "CMDQ error (cons 0x%08x): %s\n", cons,
+	dev_err(dev, "CMDQ error (cons 0x%08x): %s\n", cons,
 		idx < ARRAY_SIZE(cerror_str) ?  cerror_str[idx] : "Unknown");
 
 	switch (idx) {
 	case CMDQ_ERR_CERROR_ABT_IDX:
-		dev_err(smmu->dev, "retrying command fetch\n");
+		dev_err(dev, "retrying command fetch\n");
 		return;
 	case CMDQ_ERR_CERROR_NONE_IDX:
 		return;
@@ -424,9 +423,12 @@ static void __arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu,
 	 * not to touch any of the shadow cmdq state.
 	 */
 	queue_read(cmd, Q_ENT(q, cons), q->ent_dwords);
-	dev_err(smmu->dev, "skipping command in error state:\n");
+	dev_err(dev, "skipping command in error state:\n");
 	for (i = 0; i < ARRAY_SIZE(cmd); ++i)
-		dev_err(smmu->dev, "\t0x%016llx\n", (unsigned long long)cmd[i]);
+		dev_err(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);
@@ -436,7 +438,7 @@ static void __arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu,
 
 static void arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu)
 {
-	__arm_smmu_cmdq_skip_err(smmu, &smmu->cmdq.q);
+	__arm_smmu_cmdq_skip_err(smmu->dev, &smmu->cmdq.q);
 }
 
 /*
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 4af0976a2338..3046c1028e66 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -760,6 +760,7 @@ 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 device *dev, struct arm_smmu_queue *q);
 
 #ifdef CONFIG_ARM_SMMU_V3_SVA
 bool arm_smmu_sva_supported(struct arm_smmu_device *smmu);
-- 
2.43.0