linux-kernel - [PATCH v4 1/6] iommu/arm-smmu-v3: Add CS

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Message-ID: <6e1704f99d8f31b7abe653fe95f459377857937b.1711690673.git.nicolinc@nvidia.com>
Date: Thu, 28 Mar 2024 23:14:05 -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 1/6] iommu/arm-smmu-v3: Add CS_NONE quirk

The CMDQV extension in NVIDIA Tegra241 SoC only supports CS_NONE in the
CS field of CMD_SYNC. Add a quirk flag to accommodate that.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 10 ++++++++--
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  4 ++++
 2 files changed, 12 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 5ed036225e69..da3957ad95be 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -334,7 +334,9 @@ static int arm_smmu_cmdq_build_cmd(u64 *cmd, struct arm_smmu_cmdq_ent *ent)
 		cmd[1] |= FIELD_PREP(CMDQ_RESUME_1_STAG, ent->resume.stag);
 		break;
 	case CMDQ_OP_CMD_SYNC:
-		if (ent->sync.msiaddr) {
+		if (ent->sync.cs_none) {
+			cmd[0] |= FIELD_PREP(CMDQ_SYNC_0_CS, CMDQ_SYNC_0_CS_NONE);
+		} else if (ent->sync.msiaddr) {
 			cmd[0] |= FIELD_PREP(CMDQ_SYNC_0_CS, CMDQ_SYNC_0_CS_IRQ);
 			cmd[1] |= ent->sync.msiaddr & CMDQ_SYNC_1_MSIADDR_MASK;
 		} else {
@@ -371,6 +373,9 @@ static void arm_smmu_cmdq_build_sync_cmd(u64 *cmd, struct arm_smmu_device *smmu,
 				   q->ent_dwords * 8;
 	}
 
+	if (q->quirks & CMDQ_QUIRK_SYNC_CS_NONE_ONLY)
+		ent.sync.cs_none = true;
+
 	arm_smmu_cmdq_build_cmd(cmd, &ent);
 }
 
@@ -707,7 +712,8 @@ 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_ll_queue *llq)
 {
-	if (smmu->options & ARM_SMMU_OPT_MSIPOLL)
+	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_consumed(smmu, llq);
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 23baf117e7e4..b95d9a9ae0a8 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -509,6 +509,7 @@ struct arm_smmu_cmdq_ent {
 		#define CMDQ_OP_CMD_SYNC	0x46
 		struct {
 			u64			msiaddr;
+			bool			cs_none;
 		} sync;
 	};
 };
@@ -541,6 +542,9 @@ struct arm_smmu_queue {
 
 	u32 __iomem			*prod_reg;
 	u32 __iomem			*cons_reg;
+
+#define CMDQ_QUIRK_SYNC_CS_NONE_ONLY	BIT(0)	/* CMD_SYNC CS field supports CS_NONE only */
+	u32				quirks;
 };
 
 struct arm_smmu_queue_poll {
-- 
2.43.0