amd-iommu: print ivmd information to dmesg when requested

Add information about device memory mapping requirements for the IOMMU
as described in the IVRS ACPI table to the kernel log if amd_iommu_dump
was specified on the kernel command line.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index fe3e6453cbf7..b90a78cfdcb8 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -983,6 +983,7 @@ static int __init init_exclusion_range(struct ivmd_header *m)
 static int __init init_unity_map_range(struct ivmd_header *m)
 {
         struct unity_map_entry *e = 0;
+        char *s;
 
         e = kzalloc(sizeof(*e), GFP_KERNEL);
         if (e == NULL)
@@ -991,13 +992,16 @@ static int __init init_unity_map_range(struct ivmd_header *m)
         switch (m->type) {
         default:
         case ACPI_IVMD_TYPE:
+                s = "IVMD_TYPEi\t\t\t";
                 e->devid_start = e->devid_end = m->devid;
                 break;
         case ACPI_IVMD_TYPE_ALL:
+                s = "IVMD_TYPE_ALL\t\t";
                 e->devid_start = 0;
                 e->devid_end = amd_iommu_last_bdf;
                 break;
         case ACPI_IVMD_TYPE_RANGE:
+                s = "IVMD_TYPE_RANGE\t\t";
                 e->devid_start = m->devid;
                 e->devid_end = m->aux;
                 break;
@@ -1006,6 +1010,13 @@ static int __init init_unity_map_range(struct ivmd_header *m)
         e->address_end = e->address_start + PAGE_ALIGN(m->range_length);
         e->prot = m->flags >> 1;
 
+        DUMP_printk("%s devid_start: %02x:%02x.%x devid_end: %02x:%02x.%x"
+                    " range_start: %016llx range_end: %016llx flags: %x\n", s,
+                    PCI_BUS(e->devid_start), PCI_SLOT(e->devid_start),
+                    PCI_FUNC(e->devid_start), PCI_BUS(e->devid_end),
+                    PCI_SLOT(e->devid_end), PCI_FUNC(e->devid_end),
+                    e->address_start, e->address_end, m->flags);
+
         list_add_tail(&e->list, &amd_iommu_unity_map);
 
         return 0;