[PATCH v6 1/9] iommu: Introduce a union to struct iommu_resv_region
From: Shameer Kolothum <hidden>
Date: 2021-07-16 08:37:19
Also in:
linux-acpi, linux-iommu
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
A union is introduced to struct iommu_resv_region to hold any firmware specific data. This is in preparation to add support for IORT RMR reserve regions and the union now holds the RMR specific information. Signed-off-by: Shameer Kolothum <redacted> --- include/linux/iommu.h | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 32d448050bf7..bd0e4641c569 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h@@ -114,6 +114,13 @@ enum iommu_resv_type { IOMMU_RESV_SW_MSI, }; +struct iommu_iort_rmr_data { +#define IOMMU_RMR_REMAP_PERMITTED (1 << 0) + u32 flags; + u32 sid; /* Stream Id associated with RMR entry */ + void *smmu; /* Associated IORT SMMU node pointer */ +}; + /** * struct iommu_resv_region - descriptor for a reserved memory region * @list: Linked list pointers
@@ -121,6 +128,7 @@ enum iommu_resv_type { * @length: Length of the region in bytes * @prot: IOMMU Protection flags (READ/WRITE/...) * @type: Type of the reserved region + * @rmr: ACPI IORT RMR specific data */ struct iommu_resv_region { struct list_head list;
@@ -128,6 +136,9 @@ struct iommu_resv_region { size_t length; int prot; enum iommu_resv_type type; + union { + struct iommu_iort_rmr_data rmr; + } fw_data; }; /**
--
2.17.1
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