iommu/amd: Fix printing of IOMMU events when rate limiting kicks in

For the printing of RMP_HW_ERROR / RMP_PAGE_FAULT / IO_PAGE_FAULT
events, the AMD IOMMU code uses such logic:

	if (pdev)
		dev_data = dev_iommu_priv_get(&pdev->dev);

	if (dev_data && __ratelimit(&dev_data->rs)) {
		pci_err(pdev, ...
	} else {
		printk_ratelimit() / pr_err{,_ratelimited}(...
	}

This means that if we receive an event for a PCI devid which actually
does have a struct pci_dev and an attached struct iommu_dev_data, but
rate limiting kicks in, we'll fall back to the non-PCI branch of the
test, and print the event in a different format.

Fix this by changing the logic to:

	if (dev_data) {
		if (__ratelimit(&dev_data->rs)) {
			pci_err(pdev, ...
		}
	} else {
		pr_err_ratelimited(...
	}

Suggested-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/YPgk1dD1gPMhJXgY@wantstofly.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 811a49a..a7d6d78 100644 (file)
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -425,9 +425,11 @@ static void amd_iommu_report_rmp_hw_error(volatile u32 *event)
        if (pdev)
                dev_data = dev_iommu_priv_get(&pdev->dev);
 
-       if (dev_data && __ratelimit(&dev_data->rs)) {
-               pci_err(pdev, "Event logged [RMP_HW_ERROR vmg_tag=0x%04x, spa=0x%llx, flags=0x%04x]\n",
-                       vmg_tag, spa, flags);
+       if (dev_data) {
+               if (__ratelimit(&dev_data->rs)) {
+                       pci_err(pdev, "Event logged [RMP_HW_ERROR vmg_tag=0x%04x, spa=0x%llx, flags=0x%04x]\n",
+                               vmg_tag, spa, flags);
+               }
        } else {
                pr_err_ratelimited("Event logged [RMP_HW_ERROR device=%02x:%02x.%x, vmg_tag=0x%04x, spa=0x%llx, flags=0x%04x]\n",
                        PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
@@ -456,9 +458,11 @@ static void amd_iommu_report_rmp_fault(volatile u32 *event)
        if (pdev)
                dev_data = dev_iommu_priv_get(&pdev->dev);
 
-       if (dev_data && __ratelimit(&dev_data->rs)) {
-               pci_err(pdev, "Event logged [RMP_PAGE_FAULT vmg_tag=0x%04x, gpa=0x%llx, flags_rmp=0x%04x, flags=0x%04x]\n",
-                       vmg_tag, gpa, flags_rmp, flags);
+       if (dev_data) {
+               if (__ratelimit(&dev_data->rs)) {
+                       pci_err(pdev, "Event logged [RMP_PAGE_FAULT vmg_tag=0x%04x, gpa=0x%llx, flags_rmp=0x%04x, flags=0x%04x]\n",
+                               vmg_tag, gpa, flags_rmp, flags);
+               }
        } else {
                pr_err_ratelimited("Event logged [RMP_PAGE_FAULT device=%02x:%02x.%x, vmg_tag=0x%04x, gpa=0x%llx, flags_rmp=0x%04x, flags=0x%04x]\n",
                        PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
@@ -480,11 +484,13 @@ static void amd_iommu_report_page_fault(u16 devid, u16 domain_id,
        if (pdev)
                dev_data = dev_iommu_priv_get(&pdev->dev);
 
-       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",
+       if (dev_data) {
+               if (__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 {
+               pr_err_ratelimited("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);
        }