linux-kernel - [PATCH v1 13/14] iommu/arm-smmu-v3: Add CMDQ_OP_TLBI_NH_VAA and CMDQ_OP_TLBI_NH

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Message-ID: <3b059f4b0bda1e83d402248114a774186f678387.1678348754.git.nicolinc@nvidia.com>
Date:   Thu, 9 Mar 2023 02:53:49 -0800
From:   Nicolin Chen <nicolinc@...dia.com>
To:     <jgg@...dia.com>, <robin.murphy@....com>, <will@...nel.org>
CC:     <eric.auger@...hat.com>, <kevin.tian@...el.com>,
        <baolu.lu@...ux.intel.com>, <joro@...tes.org>,
        <shameerali.kolothum.thodi@...wei.com>, <jean-philippe@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v1 13/14] iommu/arm-smmu-v3: Add CMDQ_OP_TLBI_NH_VAA and CMDQ_OP_TLBI_NH_ALL

With a nested translation setup, a stage-1 Context Descriptor table can be
managed by a guest OS in the user space. So, the kernel driver should not
assume that the guest OS will use a user space device driver that doesn't
support TLBI_NH_VAA and TLBI_NH_ALL commands.

Add them in the arm_smmu_cmdq_build_cmd(), to prepare for support of these
two TLBI invalidation requests from the guest level.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 4 ++++
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 2 ++
 2 files changed, 6 insertions(+)

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 1f318b5e0921..ac63185ae268 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -277,6 +277,9 @@ static int arm_smmu_cmdq_build_cmd(u64 *cmd, struct arm_smmu_cmdq_ent *ent)
 		/* Cover the entire SID range */
 		cmd[1] |= FIELD_PREP(CMDQ_CFGI_1_RANGE, 31);
 		break;
+	case CMDQ_OP_TLBI_NH_VAA:
+		ent->tlbi.asid = 0;
+		fallthrough;
 	case CMDQ_OP_TLBI_NH_VA:
 		cmd[0] |= FIELD_PREP(CMDQ_TLBI_0_VMID, ent->tlbi.vmid);
 		fallthrough;
@@ -301,6 +304,7 @@ static int arm_smmu_cmdq_build_cmd(u64 *cmd, struct arm_smmu_cmdq_ent *ent)
 	case CMDQ_OP_TLBI_NH_ASID:
 		cmd[0] |= FIELD_PREP(CMDQ_TLBI_0_ASID, ent->tlbi.asid);
 		fallthrough;
+	case CMDQ_OP_TLBI_NH_ALL:
 	case CMDQ_OP_TLBI_S12_VMALL:
 		cmd[0] |= FIELD_PREP(CMDQ_TLBI_0_VMID, ent->tlbi.vmid);
 		break;
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 6cf516852721..6181d6cd8b51 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -454,8 +454,10 @@ struct arm_smmu_cmdq_ent {
 			};
 		} cfgi;
 
+		#define CMDQ_OP_TLBI_NH_ALL	0x10
 		#define CMDQ_OP_TLBI_NH_ASID	0x11
 		#define CMDQ_OP_TLBI_NH_VA	0x12
+		#define CMDQ_OP_TLBI_NH_VAA	0x13
 		#define CMDQ_OP_TLBI_EL2_ALL	0x20
 		#define CMDQ_OP_TLBI_EL2_ASID	0x21
 		#define CMDQ_OP_TLBI_EL2_VA	0x22
-- 
2.39.2