linux-kernel - [PATCH v4 4/6] iommu/arm-smmu-v3: Pass in cmdq pointer to arm_smmu_cmdq_issue

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Message-ID: <5f1283471b5e0fe415afc7af3b6db7d06f21ff53.1711690673.git.nicolinc@nvidia.com>
Date: Thu, 28 Mar 2024 23:14:08 -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 4/6] iommu/arm-smmu-v3: Pass in cmdq pointer to arm_smmu_cmdq_issue_cmdlist()

The driver currently calls arm_smmu_get_cmdq() helper in different places,
although they are all called from the arm_smmu_cmdq_issue_cmdlist().

Allow to pass in the cmdq pointer, instead of calling arm_smmu_get_cmdq()
every time.

This will also help CMDQV extension in NVIDIA Tegra241 SoC, as its driver
will maintain its own cmdq pointers, then need to redirect arm_smmu->cmdq
to one of its vcmdqs upon seeing a supported command.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 15 ++++++++-------
 1 file changed, 8 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 6cb20bff5a8a..7630c1dd5235 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -603,11 +603,11 @@ static void arm_smmu_cmdq_poll_valid_map(struct arm_smmu_cmdq *cmdq,
 
 /* Wait for the command queue to become non-full */
 static int arm_smmu_cmdq_poll_until_not_full(struct arm_smmu_device *smmu,
+					     struct arm_smmu_cmdq *cmdq,
 					     struct arm_smmu_ll_queue *llq)
 {
 	unsigned long flags;
 	struct arm_smmu_queue_poll qp;
-	struct arm_smmu_cmdq *cmdq = arm_smmu_get_cmdq(smmu);
 	int ret = 0;
 
 	/*
@@ -638,11 +638,11 @@ static int arm_smmu_cmdq_poll_until_not_full(struct arm_smmu_device *smmu,
  * Must be called with the cmdq lock held in some capacity.
  */
 static int __arm_smmu_cmdq_poll_until_msi(struct arm_smmu_device *smmu,
+					  struct arm_smmu_cmdq *cmdq,
 					  struct arm_smmu_ll_queue *llq)
 {
 	int ret = 0;
 	struct arm_smmu_queue_poll qp;
-	struct arm_smmu_cmdq *cmdq = arm_smmu_get_cmdq(smmu);
 	u32 *cmd = (u32 *)(Q_ENT(&cmdq->q, llq->prod));
 
 	queue_poll_init(smmu, &qp);
@@ -662,10 +662,10 @@ static int __arm_smmu_cmdq_poll_until_msi(struct arm_smmu_device *smmu,
  * Must be called with the cmdq lock held in some capacity.
  */
 static int __arm_smmu_cmdq_poll_until_consumed(struct arm_smmu_device *smmu,
+					       struct arm_smmu_cmdq *cmdq,
 					       struct arm_smmu_ll_queue *llq)
 {
 	struct arm_smmu_queue_poll qp;
-	struct arm_smmu_cmdq *cmdq = arm_smmu_get_cmdq(smmu);
 	u32 prod = llq->prod;
 	int ret = 0;
 
@@ -712,13 +712,14 @@ static int __arm_smmu_cmdq_poll_until_consumed(struct arm_smmu_device *smmu,
 }
 
 static int arm_smmu_cmdq_poll_until_sync(struct arm_smmu_device *smmu,
+					 struct arm_smmu_cmdq *cmdq,
 					 struct arm_smmu_ll_queue *llq)
 {
 	if (smmu->options & ARM_SMMU_OPT_MSIPOLL &&
 	    !(cmdq->q.quirks & CMDQ_QUIRK_SYNC_CS_NONE_ONLY))
-		return __arm_smmu_cmdq_poll_until_msi(smmu, llq);
+		return __arm_smmu_cmdq_poll_until_msi(smmu, cmdq, llq);
 
-	return __arm_smmu_cmdq_poll_until_consumed(smmu, llq);
+	return __arm_smmu_cmdq_poll_until_consumed(smmu, cmdq, llq);
 }
 
 static void arm_smmu_cmdq_write_entries(struct arm_smmu_cmdq *cmdq, u64 *cmds,
@@ -775,7 +776,7 @@ static int arm_smmu_cmdq_issue_cmdlist(struct arm_smmu_device *smmu,
 
 		while (!queue_has_space(&llq, n + sync)) {
 			local_irq_restore(flags);
-			if (arm_smmu_cmdq_poll_until_not_full(smmu, &llq))
+			if (arm_smmu_cmdq_poll_until_not_full(smmu, cmdq, &llq))
 				dev_err_ratelimited(smmu->dev, "CMDQ timeout\n");
 			local_irq_save(flags);
 		}
@@ -851,7 +852,7 @@ static int arm_smmu_cmdq_issue_cmdlist(struct arm_smmu_device *smmu,
 	/* 5. If we are inserting a CMD_SYNC, we must wait for it to complete */
 	if (sync) {
 		llq.prod = queue_inc_prod_n(&llq, n);
-		ret = arm_smmu_cmdq_poll_until_sync(smmu, &llq);
+		ret = arm_smmu_cmdq_poll_until_sync(smmu, cmdq, &llq);
 		if (ret) {
 			dev_err_ratelimited(smmu->dev,
 					    "CMD_SYNC timeout at 0x%08x [hwprod 0x%08x, hwcons 0x%08x]\n",
-- 
2.43.0