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iommu/amd: Rate limit INVALID_PPR_REQUEST error logging

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The amd_iommu_report_ppr_err() function logs an error message for every
INVALID_PPR_REQUEST event. Under certain fault conditions, a misbehaving
or malicious device can flood the IOMMU event log with PPR faults, causing
the kernel log to be overwhelmed with repeated error messages.

Switch from dev_err() to dev_err_ratelimited() to suppress duplicate
messages when INVALID_PPR_REQUEST events occur at a high rate.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Ankit Soni <Ankit.Soni@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Vasant Hegde 2026-08-11 04:08:59 +00:00 committed by Joerg Roedel
parent bc1f5ec826
commit abdbd786c5
1 changed files with 4 additions and 3 deletions
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7
drivers/iommu/amd/iommu.c
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@ -913,9 +913,10 @@ static void amd_iommu_report_ppr_err(struct amd_iommu *iommu, volatile u32 *even
u32 pasid = PPR_PASID(*((u64 *)event));
int tag = event[1] & 0x03FF;
dev_err(dev, "Event logged [INVALID_PPR_REQUEST device=%04x:%02x:%02x.%x pasid=0x%05x address=0x%llx flags=0x%04x tag=0x%03x]\n",
iommu->pci_seg->id, PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
pasid, address, flags, tag);
dev_err_ratelimited(dev, "Event logged [INVALID_PPR_REQUEST device=%04x:%02x:%02x.%x "
"pasid=0x%05x address=0x%llx flags=0x%04x tag=0x%03x]\n",
iommu->pci_seg->id, PCI_BUS_NUM(devid), PCI_SLOT(devid),
PCI_FUNC(devid), pasid, address, flags, tag);
/* Skip COMPLETE_PPR_REQUEST response if RX=1 */
if (flags & EVENT_FLAG_PPR_RX)