x86, AMD IOMMU: add functions to parse IOMMU memory mapping requirements for devices

This patch adds the functions to parse the information about IOMMU exclusion
ranges and required unity mappings for the devices handled by the IOMMU.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: Sebastian.Biemueller@amd.com
Cc: robert.richter@amd.com
Cc: joro@8bytes.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 3f4f7b8904417f3d018ca4257e95a371776d31f2..555fcc9830c8fbf31369117ae5b711a3cd01a68b 100644 (file)
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -556,3 +556,90 @@ static int __init init_iommu_all(struct acpi_table_header *table)
        return 0;
 }
 
+static void __init free_unity_maps(void)
+{
+       struct unity_map_entry *entry, *next;
+
+       list_for_each_entry_safe(entry, next, &amd_iommu_unity_map, list) {
+               list_del(&entry->list);
+               kfree(entry);
+       }
+}
+
+static int __init init_exclusion_range(struct ivmd_header *m)
+{
+       int i;
+
+       switch (m->type) {
+       case ACPI_IVMD_TYPE:
+               set_device_exclusion_range(m->devid, m);
+               break;
+       case ACPI_IVMD_TYPE_ALL:
+               for (i = 0; i < amd_iommu_last_bdf; ++i)
+                       set_device_exclusion_range(i, m);
+               break;
+       case ACPI_IVMD_TYPE_RANGE:
+               for (i = m->devid; i <= m->aux; ++i)
+                       set_device_exclusion_range(i, m);
+               break;
+       default:
+               break;
+       }
+
+       return 0;
+}
+
+static int __init init_unity_map_range(struct ivmd_header *m)
+{
+       struct unity_map_entry *e = 0;
+
+       e = kzalloc(sizeof(*e), GFP_KERNEL);
+       if (e == NULL)
+               return -ENOMEM;
+
+       switch (m->type) {
+       default:
+       case ACPI_IVMD_TYPE:
+               e->devid_start = e->devid_end = m->devid;
+               break;
+       case ACPI_IVMD_TYPE_ALL:
+               e->devid_start = 0;
+               e->devid_end = amd_iommu_last_bdf;
+               break;
+       case ACPI_IVMD_TYPE_RANGE:
+               e->devid_start = m->devid;
+               e->devid_end = m->aux;
+               break;
+       }
+       e->address_start = PAGE_ALIGN(m->range_start);
+       e->address_end = e->address_start + PAGE_ALIGN(m->range_length);
+       e->prot = m->flags >> 1;
+
+       list_add_tail(&e->list, &amd_iommu_unity_map);
+
+       return 0;
+}
+
+static int __init init_memory_definitions(struct acpi_table_header *table)
+{
+       u8 *p = (u8 *)table, *end = (u8 *)table;
+       struct ivmd_header *m;
+
+       INIT_LIST_HEAD(&amd_iommu_unity_map);
+
+       end += table->length;
+       p += IVRS_HEADER_LENGTH;
+
+       while (p < end) {
+               m = (struct ivmd_header *)p;
+               if (m->flags & IVMD_FLAG_EXCL_RANGE)
+                       init_exclusion_range(m);
+               else if (m->flags & IVMD_FLAG_UNITY_MAP)
+                       init_unity_map_range(m);
+
+               p += m->length;
+       }
+
+       return 0;
+}
+