[Xen-changelog] [xen stable-4.2] AMD IOMMU: also spot missing IO-APIC entries in IVRS table

[patchbot@xxxxxxx]

commit 17afdf54aaebbd1e37549f8f30fc76b0343b8ef1
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Feb 15 15:27:44 2013 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Feb 15 15:27:44 2013 +0100

    AMD IOMMU: also spot missing IO-APIC entries in IVRS table
    
    Apart from dealing duplicate conflicting entries, we also have to
    handle firmware omitting IO-APIC entries in IVRS altogether. Not doing
    so has resulted in c/s 26517:601139e2b0db to crash such systems during
    boot (whereas with the change here the IOMMU gets disabled just as is
    being done in the other cases, i.e. unless global tables are being
    used).
    
    Debugging this issue has also pointed out that the debug log output is
    pretty ugly to look at - consolidate the output, and add one extra
    item for the IVHD special entries, so that future issues are easier
    to analyze.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Tested-by: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    xen-unstable changeset: 26531:e68f14b9e739
    xen-unstable date: Thu Feb 14 08:40:52 UTC 2013
---
 xen/drivers/passthrough/amd/iommu_acpi.c |   51 +++++++++++++++++++++--------
 1 files changed, 37 insertions(+), 14 deletions(-)

diff --git a/xen/drivers/passthrough/amd/iommu_acpi.c 
b/xen/drivers/passthrough/amd/iommu_acpi.c
index 3c7a1a1..da7d576 100644
--- a/xen/drivers/passthrough/amd/iommu_acpi.c
+++ b/xen/drivers/passthrough/amd/iommu_acpi.c
@@ -352,9 +352,8 @@ static int __init parse_ivmd_block(const struct 
acpi_ivrs_memory *ivmd_block)
     base = start_addr & PAGE_MASK;
     limit = (start_addr + mem_length - 1) & PAGE_MASK;
 
-    AMD_IOMMU_DEBUG("IVMD Block: Type 0x%x\n",ivmd_block->header.type);
-    AMD_IOMMU_DEBUG(" Start_Addr_Phys 0x%lx\n", start_addr);
-    AMD_IOMMU_DEBUG(" Mem_Length 0x%lx\n", mem_length);
+    AMD_IOMMU_DEBUG("IVMD Block: type %#x phys %#lx len %#lx\n",
+                    ivmd_block->header.type, start_addr, mem_length);
 
     if ( ivmd_block->header.flags & ACPI_IVMD_EXCLUSION_RANGE )
         iw = ir = IOMMU_CONTROL_ENABLED;
@@ -549,8 +548,8 @@ static u16 __init parse_ivhd_device_alias_range(
         return 0;
     }
 
-    AMD_IOMMU_DEBUG(" Dev_Id Range: 0x%x -> 0x%x\n", first_bdf, last_bdf);
-    AMD_IOMMU_DEBUG(" Dev_Id Alias: 0x%x\n", alias_id);
+    AMD_IOMMU_DEBUG(" Dev_Id Range: %#x -> %#x alias %#x\n",
+                    first_bdf, last_bdf, alias_id);
 
     for ( bdf = first_bdf; bdf <= last_bdf; bdf++ )
         add_ivrs_mapping_entry(bdf, alias_id, range->alias.header.data_setting,
@@ -652,6 +651,9 @@ static u16 __init parse_ivhd_device_special(
         return 0;
     }
 
+    AMD_IOMMU_DEBUG("IVHD Special: %04x:%02x:%02x.%u variety %#x handle %#x\n",
+                    seg, PCI_BUS(bdf), PCI_SLOT(bdf), PCI_FUNC(bdf),
+                    special->variety, special->handle);
     add_ivrs_mapping_entry(bdf, bdf, special->header.data_setting, iommu);
 
     if ( special->variety != ACPI_IVHD_IOAPIC )
@@ -737,10 +739,9 @@ static int __init parse_ivhd_block(const struct 
acpi_ivrs_hardware *ivhd_block)
     {
         ivhd_device = (const void *)((const u8 *)ivhd_block + block_length);
 
-        AMD_IOMMU_DEBUG( "IVHD Device Entry:\n");
-        AMD_IOMMU_DEBUG( " Type 0x%x\n", ivhd_device->header.type);
-        AMD_IOMMU_DEBUG( " Dev_Id 0x%x\n", ivhd_device->header.id);
-        AMD_IOMMU_DEBUG( " Flags 0x%x\n", ivhd_device->header.data_setting);
+        AMD_IOMMU_DEBUG("IVHD Device Entry: type %#x id %#x flags %#x\n",
+                        ivhd_device->header.type, ivhd_device->header.id,
+                        ivhd_device->header.data_setting);
 
         switch ( ivhd_device->header.type )
         {
@@ -869,6 +870,7 @@ static int __init parse_ivrs_table(struct acpi_table_header 
*table)
 {
     const struct acpi_ivrs_header *ivrs_block;
     unsigned long length;
+    unsigned int apic;
     int error = 0;
 
     BUG_ON(!table);
@@ -882,11 +884,9 @@ static int __init parse_ivrs_table(struct 
acpi_table_header *table)
     {
         ivrs_block = (struct acpi_ivrs_header *)((u8 *)table + length);
 
-        AMD_IOMMU_DEBUG("IVRS Block:\n");
-        AMD_IOMMU_DEBUG(" Type 0x%x\n", ivrs_block->type);
-        AMD_IOMMU_DEBUG(" Flags 0x%x\n", ivrs_block->flags);
-        AMD_IOMMU_DEBUG(" Length 0x%x\n", ivrs_block->length);
-        AMD_IOMMU_DEBUG(" Dev_Id 0x%x\n", ivrs_block->device_id);
+        AMD_IOMMU_DEBUG("IVRS Block: type %#x flags %#x len %#x id %#x\n",
+                        ivrs_block->type, ivrs_block->flags,
+                        ivrs_block->length, ivrs_block->device_id);
 
         if ( table->length < (length + ivrs_block->length) )
         {
@@ -901,6 +901,29 @@ static int __init parse_ivrs_table(struct 
acpi_table_header *table)
         length += ivrs_block->length;
     }
 
+    /* Each IO-APIC must have been mentioned in the table. */
+    for ( apic = 0; !error && apic < nr_ioapics; ++apic )
+    {
+        if ( !nr_ioapic_entries[apic] ||
+             ioapic_sbdf[IO_APIC_ID(apic)].pin_setup )
+            continue;
+
+        printk(XENLOG_ERR "IVHD Error: no information for IO-APIC %#x\n",
+               IO_APIC_ID(apic));
+        if ( amd_iommu_perdev_intremap )
+            error = -ENXIO;
+        else
+        {
+            ioapic_sbdf[IO_APIC_ID(apic)].pin_setup = xzalloc_array(
+                unsigned long, BITS_TO_LONGS(nr_ioapic_entries[apic]));
+            if ( !ioapic_sbdf[IO_APIC_ID(apic)].pin_setup )
+            {
+                printk(XENLOG_ERR "IVHD Error: Out of memory\n");
+                error = -ENOMEM;
+            }
+        }
+    }
+
     return error;
 }
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.2

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