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authorVasant Hegde <vasant.hegde@amd.com>2022-08-25 09:39:39 +0300
committerJoerg Roedel <jroedel@suse.de>2022-09-07 17:12:37 +0300
commitd799a183da39ac4988b62da8978950efa177ba9f (patch)
treefed5bc52f405806d2e7f044d33270495db665140 /drivers/iommu/amd
parent4db6c41f09469ab8ca5d30f5d4731f299d25ff1c (diff)
downloadlinux-d799a183da39ac4988b62da8978950efa177ba9f.tar.xz
iommu/amd: Add command-line option to enable different page table
Enhance amd_iommu command line option to specify v1 or v2 page table. By default system will boot in V1 page table mode. Co-developed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Vasant Hegde <vasant.hegde@amd.com> Link: https://lore.kernel.org/r/20220825063939.8360-10-vasant.hegde@amd.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/amd')
-rw-r--r--drivers/iommu/amd/init.c23
1 files changed, 18 insertions, 5 deletions
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 779d4f9b17f8..688cf8387b0b 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -3379,17 +3379,30 @@ static int __init parse_amd_iommu_intr(char *str)
static int __init parse_amd_iommu_options(char *str)
{
- for (; *str; ++str) {
+ if (!str)
+ return -EINVAL;
+
+ while (*str) {
if (strncmp(str, "fullflush", 9) == 0) {
pr_warn("amd_iommu=fullflush deprecated; use iommu.strict=1 instead\n");
iommu_set_dma_strict();
- }
- if (strncmp(str, "force_enable", 12) == 0)
+ } else if (strncmp(str, "force_enable", 12) == 0) {
amd_iommu_force_enable = true;
- if (strncmp(str, "off", 3) == 0)
+ } else if (strncmp(str, "off", 3) == 0) {
amd_iommu_disabled = true;
- if (strncmp(str, "force_isolation", 15) == 0)
+ } else if (strncmp(str, "force_isolation", 15) == 0) {
amd_iommu_force_isolation = true;
+ } else if (strncmp(str, "pgtbl_v1", 8) == 0) {
+ amd_iommu_pgtable = AMD_IOMMU_V1;
+ } else if (strncmp(str, "pgtbl_v2", 8) == 0) {
+ amd_iommu_pgtable = AMD_IOMMU_V2;
+ } else {
+ pr_notice("Unknown option - '%s'\n", str);
+ }
+
+ str += strcspn(str, ",");
+ while (*str == ',')
+ str++;
}
return 1;