linux-kernel - [PATCH v2 0/2] iommu/arm-smmu-v3: Add support for ECMDQ register mode

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Date:   Wed,  9 Aug 2023 21:13:01 +0800
From:   thunder.leizhen@...weicloud.com
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Cc:     Zhen Lei <thunder.leizhen@...wei.com>,
        Tanmay Jagdale <tanmay@...vell.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v2 0/2] iommu/arm-smmu-v3: Add support for ECMDQ register mode

From: Zhen Lei <thunder.leizhen@...wei.com>

v1 --> v2:
1. Drop patch "iommu/arm-smmu-v3: Add arm_smmu_ecmdq_issue_cmdlist() for non-shared ECMDQ" in v1
2. Drop patch "iommu/arm-smmu-v3: Add support for less than one ECMDQ per core" in v1
3. Replace rwlock with IPI to support lockless protection against the write operation to bit
   'ERRACK' during error handling and the read operation to bit 'ERRACK' during command insertion. 
4. Standardize variable names.
-	struct arm_smmu_ecmdq *__percpu	*ecmdq;
+	struct arm_smmu_ecmdq *__percpu	*ecmdqs;

5. Add member 'iobase' to struct arm_smmu_device to record the start physical
   address of the SMMU, to replace translation operation (vmalloc_to_pfn(smmu->base) << PAGE_SHIFT)
+	phys_addr_t			iobase;
-	smmu_dma_base = (vmalloc_to_pfn(smmu->base) << PAGE_SHIFT);

6. Cancel below union. Whether ECMDQ is enabled is determined only based on 'ecmdq_enabled'.
-	union {
-		u32			nr_ecmdq;
-		u32			ecmdq_enabled;
-	};
+	u32				nr_ecmdq;
+	bool				ecmdq_enabled;

7. Eliminate some sparse check warnings. For example.
-	struct arm_smmu_ecmdq *ecmdq;
+	struct arm_smmu_ecmdq __percpu *ecmdq;



Zhen Lei (2):
  iommu/arm-smmu-v3: Add support for ECMDQ register mode
  iommu/arm-smmu-v3: Ensure that a set of associated commands are
    inserted in the same ECMDQ

 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 260 +++++++++++++++++++-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  33 +++
 2 files changed, 285 insertions(+), 8 deletions(-)

-- 
2.34.1