AMD IOMMU: add event handling code

This patch adds code for polling and printing out events generated by
the AMD IOMMU.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 86 insertions, 1 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 0e494b9d5f20..0cb8fd2359f5 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -55,9 +55,94 @@ static int iommu_has_npcache(struct amd_iommu *iommu)
  *
  ****************************************************************************/
 
+static void iommu_print_event(void *__evt)
+{
+        u32 *event = __evt;
+        int type  = (event[1] >> EVENT_TYPE_SHIFT)  & EVENT_TYPE_MASK;
+        int devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
+        int domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK;
+        int flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
+        u64 address = (u64)(((u64)event[3]) << 32) | event[2];
+
+        printk(KERN_ERR "AMD IOMMU: Event logged [");
+
+        switch (type) {
+        case EVENT_TYPE_ILL_DEV:
+                printk("ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x "
+                       "address=0x%016llx flags=0x%04x]\n",
+                       PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
+                       address, flags);
+                break;
+        case EVENT_TYPE_IO_FAULT:
+                printk("IO_PAGE_FAULT device=%02x:%02x.%x "
+                       "domain=0x%04x address=0x%016llx flags=0x%04x]\n",
+                       PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
+                       domid, address, flags);
+                break;
+        case EVENT_TYPE_DEV_TAB_ERR:
+                printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
+                       "address=0x%016llx flags=0x%04x]\n",
+                       PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
+                       address, flags);
+                break;
+        case EVENT_TYPE_PAGE_TAB_ERR:
+                printk("PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
+                       "domain=0x%04x address=0x%016llx flags=0x%04x]\n",
+                       PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
+                       domid, address, flags);
+                break;
+        case EVENT_TYPE_ILL_CMD:
+                printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address);
+                break;
+        case EVENT_TYPE_CMD_HARD_ERR:
+                printk("COMMAND_HARDWARE_ERROR address=0x%016llx "
+                       "flags=0x%04x]\n", address, flags);
+                break;
+        case EVENT_TYPE_IOTLB_INV_TO:
+                printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x "
+                       "address=0x%016llx]\n",
+                       PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
+                       address);
+                break;
+        case EVENT_TYPE_INV_DEV_REQ:
+                printk("INVALID_DEVICE_REQUEST device=%02x:%02x.%x "
+                       "address=0x%016llx flags=0x%04x]\n",
+                       PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
+                       address, flags);
+                break;
+        default:
+                printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type);
+        }
+}
+
+static void iommu_poll_events(struct amd_iommu *iommu)
+{
+        u32 head, tail;
+        unsigned long flags;
+
+        spin_lock_irqsave(&iommu->lock, flags);
+
+        head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
+        tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
+
+        while (head != tail) {
+                iommu_print_event(iommu->evt_buf + head);
+                head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size;
+        }
+
+        writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
+
+        spin_unlock_irqrestore(&iommu->lock, flags);
+}
+
 irqreturn_t amd_iommu_int_handler(int irq, void *data)
 {
-        return IRQ_NONE;
+        struct amd_iommu *iommu;
+
+        list_for_each_entry(iommu, &amd_iommu_list, list)
+                iommu_poll_events(iommu);
+
+        return IRQ_HANDLED;
 }
 
 /****************************************************************************