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iommu/arm-smmu-qcom: Add debug support for TLB sync timeouts

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TLB sync timeouts can be due to various reasons such as TBU power down
or pending TCU/TBU invalidation/sync and so on. Debugging these often
require dumping of some implementation defined registers to know the
status of TBU/TCU operations and some of these registers are not
accessible in non-secure world such as from kernel and requires SMC
calls to read them in the secure world. So, add this debug support
to dump implementation defined registers for TLB sync timeout issues.

Signed-off-by: Sai Prakash Ranjan <quic_saipraka@quicinc.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20220708094230.4349-1-quic_saipraka@quicinc.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Sai Prakash Ranjan
2022-07-08 15:12:30 +05:30
committed by Will Deacon
parent 3482c0b730
commit b9b721d117
7 changed files with 211 additions and 9 deletions
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6
drivers/iommu/arm/arm-smmu/arm-smmu.c
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@@ -2074,7 +2074,6 @@ err_reset_platform_ops: __maybe_unused;
static int arm_smmu_device_probe(struct platform_device *pdev)
{
struct resource *res;
resource_size_t ioaddr;
struct arm_smmu_device *smmu;
struct device *dev = &pdev->dev;
int num_irqs, i, err;
@@ -2098,7 +2097,8 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
smmu->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(smmu->base))
return PTR_ERR(smmu->base);
ioaddr = res->start;
smmu->ioaddr = res->start;
/*
* The resource size should effectively match the value of SMMU_TOP;
* stash that temporarily until we know PAGESIZE to validate it with.
@@ -2178,7 +2178,7 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
}
err = iommu_device_sysfs_add(&smmu->iommu, smmu->dev, NULL,
"smmu.%pa", &ioaddr);
"smmu.%pa", &smmu->ioaddr);
if (err) {
dev_err(dev, "Failed to register iommu in sysfs\n");
return err;