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[v9,02/11] iommu: Introduce a union to struct iommu_resv_region

Message ID 20220404124209.1086-3-shameerali.kolothum.thodi@huawei.com (mailing list archive)
State New, archived
Headers show
Series ACPI/IORT: Support for IORT RMR node | expand

Commit Message

Shameer Kolothum April 4, 2022, 12:42 p.m. UTC 
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(+)
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Patch

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 9208eca4b0d1..733f46b14ac8 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -127,6 +127,11 @@  enum iommu_resv_type {
 	IOMMU_RESV_SW_MSI,
 };
 
+struct iommu_iort_rmr_data {
+	const 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
@@ -134,6 +139,7 @@  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: Firmware-specific data
  */
 struct iommu_resv_region {
 	struct list_head	list;
@@ -141,6 +147,9 @@  struct iommu_resv_region {
 	size_t			length;
 	int			prot;
 	enum iommu_resv_type	type;
+	union {
+		struct iommu_iort_rmr_data rmr;
+	} fw_data;
 };
 
 /**