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DOWNSTREAM: iommu/arm-smmu-v3: Add pm suspend op

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- Issue CMD_OP_CFGI and CMD_OP_TBI_ALL to ensure all pending
transactions are complete before going into suspend and then disable
SMMU device so that there won't be any new map/unmap requests.
- Change to sleep ops to late sleep ops so that SMMU will suspend
late after clients and resume early before clients.
- Add few debug prints

Bug 5117507
Bug 5165373

Change-Id: I108861e6288fd63cebd6d2da2aa93ece071d419f
Signed-off-by: Ashish Mhetre <amhetre@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/3rdparty/canonical/linux-noble/+/3447041
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Pritesh Raithatha <praithatha@nvidia.com>
This commit is contained in:
Ashish Mhetre
2025-04-08 14:57:44 +00:00
parent 09c630f285
commit a7ae04815b
1 changed files with 20 additions and 1 deletions
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21
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
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@@ -4058,13 +4058,32 @@ static int __maybe_unused arm_smmu_runtime_resume(struct device *dev)
{
struct arm_smmu_device *smmu = dev_get_drvdata(dev);
dev_dbg(dev, "Resuming\n");
arm_smmu_device_reset(smmu, smmu->bypass);
return 0;
}
static int __maybe_unused arm_smmu_runtime_suspend(struct device *dev)
{
struct arm_smmu_device *smmu = dev_get_drvdata(dev);
struct arm_smmu_cmdq_ent cmd;
cmd.opcode = CMDQ_OP_CFGI_ALL;
arm_smmu_cmdq_issue_cmd_with_sync(smmu, &cmd);
cmd.opcode = CMDQ_OP_TLBI_NSNH_ALL;
arm_smmu_cmdq_issue_cmd_with_sync(smmu, &cmd);
dev_dbg(dev, "Disabling\n");
arm_smmu_device_disable(smmu);
dev_dbg(dev, "Suspending\n");
return 0;
}
static const struct dev_pm_ops arm_smmu_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(NULL, arm_smmu_runtime_resume)
SET_LATE_SYSTEM_SLEEP_PM_OPS(arm_smmu_runtime_suspend, arm_smmu_runtime_resume)
};
static struct platform_driver arm_smmu_driver = {