diff options
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 2 | ||||
| -rw-r--r-- | drivers/iommu/amd/init.c | 23 |
2 files changed, 20 insertions, 5 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 426fa892d311..f45c8fc2056c 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -321,6 +321,8 @@ force_enable - Force enable the IOMMU on platforms known to be buggy with IOMMU enabled. Use this option with care. + pgtbl_v1 - Use v1 page table for DMA-API (Default). + pgtbl_v2 - Use v2 page table for DMA-API. amd_iommu_dump= [HW,X86-64] Enable AMD IOMMU driver option to dump the ACPI table 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; |