linux-kernel - [PATCH v2 07/17] iommu/arm-smmu-v3: Remove ARM_SMMU_DOMAIN

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Message-ID: <1cf96ebe77f52c9f9114827ffb905ffc17a570af.1683688960.git.nicolinc@nvidia.com>
Date:   Tue, 9 May 2023 20:33:27 -0700
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>, <kvm@...r.kernel.org>,
        <alex.williamson@...hat.com>, <yi.l.liu@...el.com>
Subject: [PATCH v2 07/17] iommu/arm-smmu-v3: Remove ARM_SMMU_DOMAIN_NESTED

IOMMUFD designs two iommu_domain pointers to represent two stages. The S1
iommu_domain (IOMMU_DOMAIN_NESTED type) represents the Context Descriptor
table in the user space. The S2 iommu_domain (IOMMU_DOMAIN_UNMANAGED type)
represents the translation table in the kernel, owned by a hypervisor.

So there comes to no use case of the ARM_SMMU_DOMAIN_NESTED. Drop it, and
use the type IOMMU_DOMAIN_NESTED instead.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 2 --
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 -
 2 files changed, 3 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 327819663547..c57c70132c0b 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1291,7 +1291,6 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_master *master, u32 sid,
 			s1_cfg = &smmu_domain->s1_cfg;
 			break;
 		case ARM_SMMU_DOMAIN_S2:
-		case ARM_SMMU_DOMAIN_NESTED:
 			s2_cfg = &smmu_domain->s2_cfg;
 			break;
 		default:
@@ -2229,7 +2228,6 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain,
 		fmt = ARM_64_LPAE_S1;
 		finalise_stage_fn = arm_smmu_domain_finalise_s1;
 		break;
-	case ARM_SMMU_DOMAIN_NESTED:
 	case ARM_SMMU_DOMAIN_S2:
 		ias = smmu->ias;
 		oas = smmu->oas;
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 1951a80af241..e9e45ce7a899 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -706,7 +706,6 @@ struct arm_smmu_master {
 enum arm_smmu_domain_stage {
 	ARM_SMMU_DOMAIN_S1 = 0,
 	ARM_SMMU_DOMAIN_S2,
-	ARM_SMMU_DOMAIN_NESTED,
 	ARM_SMMU_DOMAIN_BYPASS,
 };
 
-- 
2.40.1