x86, AMD IOMMU: add detect code for AMD IOMMU hardware

This patch adds the detection of AMD IOMMU hardware provided on information
from ACPI provided by the BIOS.

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 8ec48f1..3f4f7b8 100644 (file)
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -478,3 +478,81 @@ static int __init init_iommu_devices(struct amd_iommu *iommu)
        return 0;
 }
 
+static void __init free_iommu_one(struct amd_iommu *iommu)
+{
+       free_command_buffer(iommu);
+       iommu_unmap_mmio_space(iommu);
+}
+
+static void __init free_iommu_all(void)
+{
+       struct amd_iommu *iommu, *next;
+
+       list_for_each_entry_safe(iommu, next, &amd_iommu_list, list) {
+               list_del(&iommu->list);
+               free_iommu_one(iommu);
+               kfree(iommu);
+       }
+}
+
+static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
+{
+       spin_lock_init(&iommu->lock);
+       list_add_tail(&iommu->list, &amd_iommu_list);
+
+       /*
+        * Copy data from ACPI table entry to the iommu struct
+        */
+       iommu->devid = h->devid;
+       iommu->cap_ptr = h->cap_ptr;
+       iommu->mmio_phys = h->mmio_phys;
+       iommu->mmio_base = iommu_map_mmio_space(h->mmio_phys);
+       if (!iommu->mmio_base)
+               return -ENOMEM;
+
+       iommu_set_device_table(iommu);
+       iommu->cmd_buf = alloc_command_buffer(iommu);
+       if (!iommu->cmd_buf)
+               return -ENOMEM;
+
+       init_iommu_from_pci(iommu);
+       init_iommu_from_acpi(iommu, h);
+       init_iommu_devices(iommu);
+
+       return 0;
+}
+
+static int __init init_iommu_all(struct acpi_table_header *table)
+{
+       u8 *p = (u8 *)table, *end = (u8 *)table;
+       struct ivhd_header *h;
+       struct amd_iommu *iommu;
+       int ret;
+
+       INIT_LIST_HEAD(&amd_iommu_list);
+
+       end += table->length;
+       p += IVRS_HEADER_LENGTH;
+
+       while (p < end) {
+               h = (struct ivhd_header *)p;
+               switch (*p) {
+               case ACPI_IVHD_TYPE:
+                       iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL);
+                       if (iommu == NULL)
+                               return -ENOMEM;
+                       ret = init_iommu_one(iommu, h);
+                       if (ret)
+                               return ret;
+                       break;
+               default:
+                       break;
+               }
+               p += h->length;
+
+       }
+       WARN_ON(p != end);
+
+       return 0;
+}
+