[PATCH v2 0/4] Prepare for ECMDQ support

[Zhen Lei]

v1 --> v2:
1. Stop pre-zeroing batch commands. Patch 1 is modified. Other patches remain unchanged.
   Before:
   struct arm_smmu_cmdq_batch cmds = {};

   After:
   struct arm_smmu_cmdq_batch cmds;
   cmds.num = 0;

RFC --> v1
1. Resend the patches for ECMDQ preparation and remove the patches for ECMDQ implementation.
2. Patch 2 is modified. Other patches remain unchanged.
   1) Add static helper __arm_smmu_cmdq_issue_cmd(), and make arm_smmu_cmdq_issue_cmd()
      and arm_smmu_cmdq_issue_cmd_with_sync() implement based on it.
   2) Remove unused arm_smmu_cmdq_issue_sync().

RFC:
https://www.spinics.net/lists/arm-kernel/msg904879.html


Zhen Lei (4):
  iommu/arm-smmu-v3: Use command queue batching helpers to improve
    performance
  iommu/arm-smmu-v3: Add and use static helper function
    arm_smmu_cmdq_issue_cmd_with_sync()
  iommu/arm-smmu-v3: Add and use static helper function
    arm_smmu_get_cmdq()
  iommu/arm-smmu-v3: Extract reusable function
    __arm_smmu_cmdq_skip_err()

 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 72 ++++++++++++---------
 1 file changed, 43 insertions(+), 29 deletions(-)

-- 
2.26.0.106.g9fadedd