[Xen-devel] [PATCH 2/2] AMD/IOMMU: Render IO_PAGE_FAULT errors in a more useful manner

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Print the PCI coordinates in its common format and use d%u notation for the
domain.  As well as printing flags, decode them.  IO_PAGE_FAULT is used for
interrupt remapping errors as well as DMA remapping errors.

Before:
  (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0xa1, fault address = 
0xbf695000, flags = 0x10
  (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0xa1, fault address = 
0xbf695040, flags = 0x10
  (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0xa1, fault address = 
0xfffffff0, flags = 0x30
  (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0xa1, fault address = 
0x100000000, flags = 0x30
  (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0xa1, fault address = 
0x100000040, flags = 0x30

After:
  (XEN) AMD-Vi: IO_PAGE_FAULT: 0000:00:14.1 d0 addr 00000000bf5fc000 flags 0x10 
PR
  (XEN) AMD-Vi: IO_PAGE_FAULT: 0000:00:14.1 d0 addr 00000000bf5fc040 flags 0x10 
PR
  (XEN) AMD-Vi: IO_PAGE_FAULT: 0000:00:14.1 d0 addr 00000000fffffff0 flags 0x30 
RW PR
  (XEN) AMD-Vi: IO_PAGE_FAULT: 0000:00:14.1 d0 addr 0000000100000000 flags 0x30 
RW PR
  (XEN) AMD-Vi: IO_PAGE_FAULT: 0000:00:14.1 d0 addr 0000000100000040 flags 0x30 
RW PR

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Juergen Gross <jgross@xxxxxxxx>
---
 xen/drivers/passthrough/amd/iommu_init.c      | 35 +++++++++++++++------------
 xen/include/asm-x86/hvm/svm/amd-iommu-proto.h |  3 ---
 2 files changed, 20 insertions(+), 18 deletions(-)

diff --git a/xen/drivers/passthrough/amd/iommu_init.c 
b/xen/drivers/passthrough/amd/iommu_init.c
index 8aa8788797..cd4e6e16b8 100644
--- a/xen/drivers/passthrough/amd/iommu_init.c
+++ b/xen/drivers/passthrough/amd/iommu_init.c
@@ -513,10 +513,7 @@ static hw_irq_controller iommu_x2apic_type = {
 
 static void parse_event_log_entry(struct amd_iommu *iommu, u32 entry[])
 {
-    u16 domain_id, device_id, flags;
-    unsigned int bdf;
     u32 code;
-    u64 *addr;
     int count = 0;
     static const char *const event_str[] = {
 #define EVENT_STR(name) [IOMMU_EVENT_##name - 1] = #name
@@ -560,18 +557,26 @@ static void parse_event_log_entry(struct amd_iommu 
*iommu, u32 entry[])
 
     if ( code == IOMMU_EVENT_IO_PAGE_FAULT )
     {
-        device_id = iommu_get_devid_from_event(entry[0]);
-        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 = %#x, "
-               "fault address = %#"PRIx64", flags = %#x\n",
-               code_str, domain_id, device_id, *addr, flags);
+        unsigned int bdf;
+        uint16_t device_id = MASK_EXTR(entry[0], IOMMU_CMD_DEVICE_ID_MASK);
+        uint16_t domain_id = MASK_EXTR(entry[1], IOMMU_EVENT_DOMAIN_ID_MASK);
+        uint16_t flags = MASK_EXTR(entry[1], IOMMU_EVENT_FLAGS_MASK);
+        uint64_t addr = *(uint64_t *)(entry + 2);
+
+        printk(XENLOG_ERR "AMD-Vi: %s: %04x:%02x:%02x.%u d%d addr %016"PRIx64
+               " flags %#x%s%s%s%s%s%s%s%s%s%s\n",
+               code_str, iommu->seg, PCI_BUS(device_id), PCI_SLOT(device_id),
+               PCI_FUNC(device_id), domain_id, addr, flags,
+               (flags & 0xe00) ? " ??" : "",
+               (flags & 0x100) ? " TR" : "",
+               (flags & 0x080) ? " RZ" : "",
+               (flags & 0x040) ? " PE" : "",
+               (flags & 0x020) ? " RW" : "",
+               (flags & 0x010) ? " PR" : "",
+               (flags & 0x008) ? " I" : "",
+               (flags & 0x004) ? " US" : "",
+               (flags & 0x002) ? " NX" : "",
+               (flags & 0x001) ? " GN" : "");
 
         for ( bdf = 0; bdf < ivrs_bdf_entries; bdf++ )
             if ( get_dma_requestor_id(iommu->seg, bdf) == device_id )
diff --git a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h 
b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
index 8ed9482791..53900cd60c 100644
--- a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
+++ b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
@@ -265,9 +265,6 @@ static inline uint32_t iommu_get_addr_hi_from_cmd(uint32_t 
cmd)
                                   IOMMU_CMD_ADDR_HIGH_SHIFT);
 }
 
-/* access address field from event log entry */
-#define iommu_get_devid_from_event          iommu_get_devid_from_cmd
-
 /* access iommu base addresses field from mmio regs */
 static inline void iommu_set_addr_lo_to_reg(uint32_t *reg, uint32_t addr)
 {
-- 
2.11.0


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