xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86/amd-iommu: Add amd_iommu=off command line option

Browse Source 
This patch adds a command line option to tell the AMD IOMMU
driver to not initialize any IOMMU it finds.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel
2010-05-11 17:12:33 +02:00
parent b57f95a382
commit a523572596
2 changed files with 8 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/kernel/amd_iommu_init.c
View File

@@ -120,6 +120,7 @@ struct ivmd_header {
bool amd_iommu_dump;
static int __initdata amd_iommu_detected;
static bool __initdata amd_iommu_disabled;
u16 amd_iommu_last_bdf; /* largest PCI device id we have
to handle */
@@ -1372,6 +1373,9 @@ void __init amd_iommu_detect(void)
if (no_iommu || (iommu_detected && !gart_iommu_aperture))
return;
if (amd_iommu_disabled)
return;
if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) {
iommu_detected = 1;
amd_iommu_detected = 1;
@@ -1401,6 +1405,8 @@ static int __init parse_amd_iommu_options(char *str)
for (; *str; ++str) {
if (strncmp(str, "fullflush", 9) == 0)
amd_iommu_unmap_flush = true;
if (strncmp(str, "off", 3) == 0)
amd_iommu_disabled = true;
}
return 1;