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iommu/arm-smmu-v3: Use command queue batching helpers to improve performance

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The obvious key to the performance optimization of commit 587e6c10a7ce
("iommu/arm-smmu-v3: Reduce contention during command-queue insertion") is
to allow multiple cores to insert commands in parallel after a brief mutex
contention.

Obviously, inserting as many commands at a time as possible can reduce the
number of times the mutex contention participates, thereby improving the
overall performance. At least it reduces the number of calls to function
arm_smmu_cmdq_issue_cmdlist().

Therefore, use command queue batching helpers to insert multiple commands
at a time.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/r/20210811114852.2429-2-thunder.leizhen@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Zhen Lei 2021-08-11 19:48:49 +08:00 committed by Will Deacon
parent ef75702d6d
commit eff19474b1
1 changed files with 3 additions and 2 deletions
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5
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
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@ -1747,15 +1747,16 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master)
{
int i;
struct arm_smmu_cmdq_ent cmd;
struct arm_smmu_cmdq_batch cmds = {};
arm_smmu_atc_inv_to_cmd(0, 0, 0, &cmd);
for (i = 0; i < master->num_streams; i++) {
cmd.atc.sid = master->streams[i].id;
arm_smmu_cmdq_issue_cmd(master->smmu, &cmd);
arm_smmu_cmdq_batch_add(master->smmu, &cmds, &cmd);
}
return arm_smmu_cmdq_issue_sync(master->smmu);
return arm_smmu_cmdq_batch_submit(master->smmu, &cmds);
}
int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,