iommu/amd: Introduces ivrs_acpihid kernel parameter
This patch introduces a new kernel parameter, ivrs_acpihid.
This is used to override existing ACPI-HID IVHD device entry,
or add an entry in case it is missing in the IVHD.
Signed-off-by: Wan Zongshun <Vincent.Wan@amd.com>
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index ecc74fa..8c881a5 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1767,6 +1767,13 @@
PCI device 00:14.0 write the parameter as:
ivrs_hpet[0]=00:14.0
+ ivrs_acpihid [HW,X86_64]
+ Provide an override to the ACPI-HID:UID<->DEVICE-ID
+ mapping provided in the IVRS ACPI table. For
+ example, to map UART-HID:UID AMD0020:0 to
+ PCI device 00:14.5 write the parameter as:
+ ivrs_acpihid[00:14.5]=AMD0020:0
+
js= [HW,JOY] Analog joystick
See Documentation/input/joystick.txt.
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index e7ebfa2..9e00341 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -2477,10 +2477,43 @@
return 1;
}
+static int __init parse_ivrs_acpihid(char *str)
+{
+ u32 bus, dev, fn;
+ char *hid, *uid, *p;
+ char acpiid[ACPIHID_UID_LEN + ACPIHID_HID_LEN] = {0};
+ int ret, i;
+
+ ret = sscanf(str, "[%x:%x.%x]=%s", &bus, &dev, &fn, acpiid);
+ if (ret != 4) {
+ pr_err("AMD-Vi: Invalid command line: ivrs_acpihid(%s)\n", str);
+ return 1;
+ }
+
+ p = acpiid;
+ hid = strsep(&p, ":");
+ uid = p;
+
+ if (!hid || !(*hid) || !uid) {
+ pr_err("AMD-Vi: Invalid command line: hid or uid\n");
+ return 1;
+ }
+
+ i = early_acpihid_map_size++;
+ memcpy(early_acpihid_map[i].hid, hid, strlen(hid));
+ memcpy(early_acpihid_map[i].uid, uid, strlen(uid));
+ early_acpihid_map[i].devid =
+ ((bus & 0xff) << 8) | ((dev & 0x1f) << 3) | (fn & 0x7);
+ early_acpihid_map[i].cmd_line = true;
+
+ return 1;
+}
+
__setup("amd_iommu_dump", parse_amd_iommu_dump);
__setup("amd_iommu=", parse_amd_iommu_options);
__setup("ivrs_ioapic", parse_ivrs_ioapic);
__setup("ivrs_hpet", parse_ivrs_hpet);
+__setup("ivrs_acpihid", parse_ivrs_acpihid);
IOMMU_INIT_FINISH(amd_iommu_detect,
gart_iommu_hole_init,