On an AMD system, I/O page faults are usually logged like this: drvname 0000:05:00.0: Event logged [IO_PAGE_FAULT domain=0x0000 address=0x0000000092050da0 flags=0x0020]
But sometimes they are logged like this instead, even for the exact same PCI device: AMD-Vi: Event logged [IO_PAGE_FAULT device=05:00.0 domain=0x0000 address=0x0000000092050de0 flags=0x0020] This discrepancy appears to be caused by this code: if (dev_data && __ratelimit(&dev_data->rs)) { pci_err(pdev, "Event logged [IO_PAGE_FAULT domain=0x%04x address=0x%llx flags=0x%04x]\n", domain_id, address, flags); } else if (printk_ratelimit()) { pr_err("Event logged [IO_PAGE_FAULT device=%02x:%02x.%x domain=0x%04x address=0x%llx flags=0x%04x]\n", PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), domain_id, address, flags); } If an I/O page fault occurs for a PCI device with associated iommu_dev_data, but for which the __ratelimit(&dev_data->rs) check fails, we'll give it a second chance with printk_ratelimit(), and if that check succeeds, we will log the fault anyway, but in a different format. Change this to only check printk_ratelimit() if !dev_data, which seems to be what had been originally intended. Signed-off-by: Lennert Buytenhek <buyt...@wantstofly.org> --- drivers/iommu/amd/iommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 811a49a95d04..7ae426b092f2 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -483,7 +483,7 @@ static void amd_iommu_report_page_fault(u16 devid, u16 domain_id, if (dev_data && __ratelimit(&dev_data->rs)) { pci_err(pdev, "Event logged [IO_PAGE_FAULT domain=0x%04x address=0x%llx flags=0x%04x]\n", domain_id, address, flags); - } else if (printk_ratelimit()) { + } else if (!dev_data && printk_ratelimit()) { pr_err("Event logged [IO_PAGE_FAULT device=%02x:%02x.%x domain=0x%04x address=0x%llx flags=0x%04x]\n", PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), domain_id, address, flags); _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu