[PATCH] amd iommu: Dump flags of IO page faults

[Wei Wang <wei.wang2@amd.com>]

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Hi Jan,
Attached patch dumps io page fault flags. The flags show the reason of 
the fault and tell us if this is an unmapped interrupt fault or a DMA fault.

Thanks,
Wei

signed-off-by: Wei Wang <wei.wang2@amd.com>


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diff -r 4746414def65 xen/drivers/passthrough/amd/iommu_init.c
--- a/xen/drivers/passthrough/amd/iommu_init.c	Mon Sep 03 09:40:38 2012 +0200
+++ b/xen/drivers/passthrough/amd/iommu_init.c	Wed Sep 05 16:35:23 2012 +0200
@@ -564,7 +564,7 @@ static hw_irq_controller iommu_msi_type 
 
 static void parse_event_log_entry(struct amd_iommu *iommu, u32 entry[])
 {
-    u16 domain_id, device_id, bdf, cword;
+    u16 domain_id, device_id, bdf, cword, flags;
     u32 code;
     u64 *addr;
     int count = 0;
@@ -609,11 +609,14 @@ static void parse_event_log_entry(struct
         domain_id = get_field_from_reg_u32(entry[1],
                                            IOMMU_EVENT_DOMAIN_ID_MASK,
                                            IOMMU_EVENT_DOMAIN_ID_SHIFT);
+        flags = get_field_from_reg_u32(entry[1],
+                                       IOMMU_EVENT_FLAGS_MASK,
+                                       IOMMU_EVENT_FLAGS_SHIFT);
         addr= (u64*) (entry + 2);
         printk(XENLOG_ERR "AMD-Vi: "
                "%s: domain = %d, device id = 0x%04x, "
-               "fault address = 0x%"PRIx64"\n",
-               event_str[code-1], domain_id, device_id, *addr);
+               "fault address = 0x%"PRIx64", flags = 0x%03x\n",
+               event_str[code-1], domain_id, device_id, *addr, flags);
 
         /* Tell the device to stop DMAing; we can't rely on the guest to
          * control it for us. */
diff -r 4746414def65 xen/include/asm-x86/hvm/svm/amd-iommu-defs.h
--- a/xen/include/asm-x86/hvm/svm/amd-iommu-defs.h	Mon Sep 03 09:40:38 2012 +0200
+++ b/xen/include/asm-x86/hvm/svm/amd-iommu-defs.h	Wed Sep 05 16:35:23 2012 +0200
@@ -283,6 +283,8 @@
 #define IOMMU_EVENT_DOMAIN_ID_SHIFT          0
 #define IOMMU_EVENT_DEVICE_ID_MASK           0x0000FFFF
 #define IOMMU_EVENT_DEVICE_ID_SHIFT          0
+#define IOMMU_EVENT_FLAGS_SHIFT              16
+#define IOMMU_EVENT_FLAGS_MASK               0x0FFF0000
 
 /* PPR Log */
 #define IOMMU_PPR_LOG_ENTRY_SIZE                        16

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