On 2021-08-05 09:07, Shameer Kolothum wrote:
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 <[email protected]>
---
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 */
+};
Do we really need to duplicate all this data? AFAICS we could just save
the acpi_iort_rmr pointer in the iommu_resv_region (with a forward
declaration here if necessary) and defer parsing its actual mappings
until the point where we can directly consume the results.
Robin.
+
/**
* 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;
};
/**
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