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| author | Yu Zhang <zhangyu1@linux.microsoft.com> | 2026-09-30 22:14:07 +0800 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2026-10-09 10:37:41 +0200 |
| commit | 07f8807ca978f486243e93aa4e85d20df871cd7f (patch) | |
| tree | ab68ffde6a948d98094ec82f902fb3eef5b6efb2 /arch | |
| parent | 118bdac1054628c04c547c2c988bb06ca43677a3 (diff) | |
| download | linux-07f8807ca978f486243e93aa4e85d20df871cd7f.tar.gz linux-07f8807ca978f486243e93aa4e85d20df871cd7f.zip | |
iommu/x86: Add architectural MSI reserved region helper
Intel and AMD IOMMU drivers both reserve the x86 architectural MSI
address window from normal IOVA mappings, but each open-codes the range,
allocation attributes, and insertion into the reserved-region list.
Add iommu_add_resv_x86_msi_region() to encapsulate those operations, and
convert the Intel and AMD drivers to use it. Return an error on allocation
failure so callers can preserve their existing error paths.
Signed-off-by: Yu Zhang <zhangyu1@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/iommu.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/x86/include/asm/iommu.h b/arch/x86/include/asm/iommu.h index 3be2451e7bc8..4e1e55c3c09a 100644 --- a/arch/x86/include/asm/iommu.h +++ b/arch/x86/include/asm/iommu.h @@ -4,6 +4,11 @@ #include <linux/acpi.h> +#ifdef CONFIG_IOMMU_API +#include <linux/iommu.h> +#include <linux/sizes.h> +#endif + #include <asm/e820/api.h> extern int force_iommu, no_iommu; @@ -21,6 +26,21 @@ extern bool x86_swiotlb_enable; /* 10 seconds */ #define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000) +#ifdef CONFIG_IOMMU_API +static inline int iommu_add_resv_x86_msi_region(struct list_head *head) +{ + struct iommu_resv_region *region; + + region = iommu_alloc_resv_region(0xfee00000, SZ_1M, 0, + IOMMU_RESV_MSI, GFP_KERNEL); + if (!region) + return -ENOMEM; + + list_add_tail(®ion->list, head); + return 0; +} +#endif + static inline int __init arch_rmrr_sanity_check(struct acpi_dmar_reserved_memory *rmrr) { |