[PATCH v8 02/11] iommu: Introduce a union to struct iommu_resv_region

Shameer Kolothum
2022-02-21T15:45:12Z

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 <shameerali.kolothum.thodi@huawei.com>
---
include/linux/iommu.h | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index de0c57a567c8..b06952a75f95 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -126,6 +126,11 @@ enum iommu_resv_type {
IOMMU_RESV_SW_MSI,
};

+struct iommu_iort_rmr_data {
+ u32 *sids; /* Stream Ids associated with IORT RMR entry */
+ u32 num_sids;
+};
+
/**
* struct iommu_resv_region - descriptor for a reserved memory region
* @list: Linked list pointers
@@ -133,6 +138,7 @@ enum iommu_resv_type {
* @length: Length of the region in bytes
* @prot: IOMMU Protection flags (READ/WRITE/...)
* @type: Type of the reserved region
+ * @fw_data: FW specific reserved region data
*/
struct iommu_resv_region {
struct list_head list;
@@ -140,6 +146,9 @@ struct iommu_resv_region {
size_t length;
int prot;
enum iommu_resv_type type;
+ union {
+ struct iommu_iort_rmr_data rmr;
+ } fw_data;
};

/**
--
2.25.1