summaryrefslogtreecommitdiff
path: root/drivers/iommu/amd
diff options
context:
space:
mode:
authorJoerg Roedel <jroedel@suse.de>2021-03-17 10:10:35 +0100
committerJoerg Roedel <jroedel@suse.de>2021-03-18 10:46:30 +0100
commit072a03e0a0b1bc22eb5970727877264657c61fd3 (patch)
tree44ad742ef357029bb4c35a55b5866d030b1879d4 /drivers/iommu/amd
parent1e28eed17697bcf343c6743f0028cc3b5dd88bf0 (diff)
iommu/amd: Move Stoney Ridge check to detect_ivrs()
The AMD IOMMU will not be enabled on AMD Stoney Ridge systems. Bail out even earlier and refuse to even detect the IOMMU there. References: https://bugzilla.kernel.org/show_bug.cgi?id=212133 References: https://bugzilla.suse.com/show_bug.cgi?id=1183132 Cc: stable@vger.kernel.org # v5.11 Signed-off-by: Joerg Roedel <jroedel@suse.de> Link: https://lore.kernel.org/r/20210317091037.31374-2-joro@8bytes.org Acked-by: Huang Rui <ray.huang@amd.com>
Diffstat (limited to 'drivers/iommu/amd')
-rw-r--r--drivers/iommu/amd/init.c23
1 files changed, 12 insertions, 11 deletions
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 9126efcbaf2c..3280e6f5b720 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -2714,7 +2714,6 @@ static int __init early_amd_iommu_init(void)
struct acpi_table_header *ivrs_base;
int i, remap_cache_sz, ret;
acpi_status status;
- u32 pci_id;
if (!amd_iommu_detected)
return -ENODEV;
@@ -2804,16 +2803,6 @@ static int __init early_amd_iommu_init(void)
if (ret)
goto out;
- /* Disable IOMMU if there's Stoney Ridge graphics */
- for (i = 0; i < 32; i++) {
- pci_id = read_pci_config(0, i, 0, 0);
- if ((pci_id & 0xffff) == 0x1002 && (pci_id >> 16) == 0x98e4) {
- pr_info("Disable IOMMU on Stoney Ridge\n");
- amd_iommu_disabled = true;
- break;
- }
- }
-
/* Disable any previously enabled IOMMUs */
if (!is_kdump_kernel() || amd_iommu_disabled)
disable_iommus();
@@ -2880,6 +2869,7 @@ static bool detect_ivrs(void)
{
struct acpi_table_header *ivrs_base;
acpi_status status;
+ int i;
status = acpi_get_table("IVRS", 0, &ivrs_base);
if (status == AE_NOT_FOUND)
@@ -2892,6 +2882,17 @@ static bool detect_ivrs(void)
acpi_put_table(ivrs_base);
+ /* Don't use IOMMU if there is Stoney Ridge graphics */
+ for (i = 0; i < 32; i++) {
+ u32 pci_id;
+
+ pci_id = read_pci_config(0, i, 0, 0);
+ if ((pci_id & 0xffff) == 0x1002 && (pci_id >> 16) == 0x98e4) {
+ pr_info("Disable IOMMU on Stoney Ridge\n");
+ return false;
+ }
+ }
+
/* Make sure ACS will be enabled during PCI probe */
pci_request_acs();