iommu/amd: Extend IVRS special device data structure
This patch extends the devid_map data structure to allow
ioapic and hpet entries in ivrs to be overridden on the
kernel command line.
Reviewed-by: Shuah Khan <shuahkhan@gmail.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index ea94ee6..3a210f0 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -703,25 +703,35 @@
set_iommu_for_device(iommu, devid);
}
-static int __init add_special_device(u8 type, u8 id, u16 devid)
+static int __init add_special_device(u8 type, u8 id, u16 devid, bool cmd_line)
{
struct devid_map *entry;
struct list_head *list;
- if (type != IVHD_SPECIAL_IOAPIC && type != IVHD_SPECIAL_HPET)
+ if (type == IVHD_SPECIAL_IOAPIC)
+ list = &ioapic_map;
+ else if (type == IVHD_SPECIAL_HPET)
+ list = &hpet_map;
+ else
return -EINVAL;
+ list_for_each_entry(entry, list, list) {
+ if (!(entry->id == id && entry->cmd_line))
+ continue;
+
+ pr_info("AMD-Vi: Command-line override present for %s id %d - ignoring\n",
+ type == IVHD_SPECIAL_IOAPIC ? "IOAPIC" : "HPET", id);
+
+ return 0;
+ }
+
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return -ENOMEM;
- entry->id = id;
- entry->devid = devid;
-
- if (type == IVHD_SPECIAL_IOAPIC)
- list = &ioapic_map;
- else
- list = &hpet_map;
+ entry->id = id;
+ entry->devid = devid;
+ entry->cmd_line = cmd_line;
list_add_tail(&entry->list, list);
@@ -929,7 +939,7 @@
PCI_FUNC(devid));
set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
- ret = add_special_device(type, handle, devid);
+ ret = add_special_device(type, handle, devid, false);
if (ret)
return ret;
break;