linux-kernel - [PATCH v2 2/3] iommu: amd: Add support for RMP_PAGE_FAULT and RMP_HW

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Date:   Wed, 23 Sep 2020 12:13:46 +0000
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, Jon.Grimm@....com, brijesh.singh@....com,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH v2 2/3] iommu: amd: Add support for RMP_PAGE_FAULT and RMP_HW_ERR

IOMMU SNP support introduces two new IOMMU events:
  * RMP Page Fault event
  * RMP Hardware Error event

Hence, add reporting functions for these events.

Cc: Brijesh Singh <brijesh.singh@....com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 drivers/iommu/amd/amd_iommu_types.h |  2 +
 drivers/iommu/amd/iommu.c           | 67 +++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index 4c80483e78ec..1e7966c73707 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -128,6 +128,8 @@
 #define EVENT_TYPE_IOTLB_INV_TO	0x7
 #define EVENT_TYPE_INV_DEV_REQ	0x8
 #define EVENT_TYPE_INV_PPR_REQ	0x9
+#define EVENT_TYPE_RMP_FAULT	0xd
+#define EVENT_TYPE_RMP_HW_ERR	0xe
 #define EVENT_DEVID_MASK	0xffff
 #define EVENT_DEVID_SHIFT	0
 #define EVENT_DOMID_MASK_LO	0xffff
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 9e9898683537..ea64fa8a9418 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -486,6 +486,67 @@ static void dump_command(unsigned long phys_addr)
 		pr_err("CMD[%d]: %08x\n", i, cmd->data[i]);
 }
 
+static void amd_iommu_report_rmp_hw_error(volatile u32 *event)
+{
+	struct iommu_dev_data *dev_data = NULL;
+	int devid, vmg_tag, flags;
+	struct pci_dev *pdev;
+	u64 spa;
+
+	devid   = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
+	vmg_tag = (event[1]) & 0xFFFF;
+	flags   = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
+	spa     = ((u64)event[3] << 32) | (event[2] & 0xFFFFFFF8);
+
+	pdev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(devid),
+					   devid & 0xff);
+	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);
+	} 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),
+			vmg_tag, spa, flags);
+	}
+
+	if (pdev)
+		pci_dev_put(pdev);
+}
+
+static void amd_iommu_report_rmp_fault(volatile u32 *event)
+{
+	struct iommu_dev_data *dev_data = NULL;
+	int devid, flags_rmp, vmg_tag, flags;
+	struct pci_dev *pdev;
+	u64 gpa;
+
+	devid     = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
+	flags_rmp = (event[0] >> EVENT_FLAGS_SHIFT) & 0xFF;
+	vmg_tag   = (event[1]) & 0xFFFF;
+	flags     = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
+	gpa       = ((u64)event[3] << 32) | event[2];
+
+	pdev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(devid),
+					   devid & 0xff);
+	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);
+	} 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),
+			vmg_tag, gpa, flags_rmp, flags);
+	}
+
+	if (pdev)
+		pci_dev_put(pdev);
+}
+
 static void amd_iommu_report_page_fault(u16 devid, u16 domain_id,
 					u64 address, int flags)
 {
@@ -577,6 +638,12 @@ static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
 			PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
 			pasid, address, flags);
 		break;
+	case EVENT_TYPE_RMP_FAULT:
+		amd_iommu_report_rmp_fault(event);
+		break;
+	case EVENT_TYPE_RMP_HW_ERR:
+		amd_iommu_report_rmp_hw_error(event);
+		break;
 	case EVENT_TYPE_INV_PPR_REQ:
 		pasid = PPR_PASID(*((u64 *)__evt));
 		tag = event[1] & 0x03FF;
-- 
2.17.1