[RFC 1/2] drm/xe: Add madvise interface

[Himal Prasad Ghimiray]

This commit introduces a new madvise interface to support
driver-specific ioctl operations. The madvise interface allows for more
efficient memory management by providing hints to the kernel about the
expected memory usage policy for gpuvma.

Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
---
 include/uapi/drm/xe_drm.h | 63 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/include/uapi/drm/xe_drm.h b/include/uapi/drm/xe_drm.h
index 4a8a4a63e99c..ec51619f76f0 100644
--- a/include/uapi/drm/xe_drm.h
+++ b/include/uapi/drm/xe_drm.h
@@ -81,6 +81,7 @@ extern "C" {
  *  - &DRM_IOCTL_XE_EXEC
  *  - &DRM_IOCTL_XE_WAIT_USER_FENCE
  *  - &DRM_IOCTL_XE_OBSERVATION
+ *  - &DRM_IOCTL_XE_MADVISE
  */
 
 /*
@@ -102,6 +103,7 @@ extern "C" {
 #define DRM_XE_EXEC			0x09
 #define DRM_XE_WAIT_USER_FENCE		0x0a
 #define DRM_XE_OBSERVATION		0x0b
+#define DRM_XE_MADVISE			0x0c
 
 /* Must be kept compact -- no holes */
 
@@ -117,6 +119,7 @@ extern "C" {
 #define DRM_IOCTL_XE_EXEC			DRM_IOW(DRM_COMMAND_BASE + DRM_XE_EXEC, struct drm_xe_exec)
 #define DRM_IOCTL_XE_WAIT_USER_FENCE		DRM_IOWR(DRM_COMMAND_BASE + DRM_XE_WAIT_USER_FENCE, struct drm_xe_wait_user_fence)
 #define DRM_IOCTL_XE_OBSERVATION		DRM_IOW(DRM_COMMAND_BASE + DRM_XE_OBSERVATION, struct drm_xe_observation_param)
+#define DRM_IOCTL_XE_MADVISE			DRM_IOWR(DRM_COMMAND_BASE + DRM_XE_MADVISE, struct drm_xe_madvise)
 
 /**
  * DOC: Xe IOCTL Extensions
@@ -1713,6 +1716,66 @@ struct drm_xe_oa_stream_info {
 	__u64 reserved[3];
 };
 
+struct drm_xe_madvise_ops {
+	/** @start: start of the virtual address range */
+	__u64 start;
+	/** @size: size of the virtual address range */
+	__u64 size;
+#define DRM_XE_VMA_ATTR_PREFERRED_LOC	0
+#define DRM_XE_VMA_ATTR_ATOMIC		1
+#define DRM_XE_VMA_ATTR_PAT		2
+#define DRM_XE_VMA_ATTR_PURGEABLE_STATE	3
+	/** @type: type of attribute */
+	__u32 type;
+	union {
+#define DRM_XE_VMA_ATOMIC_UNDEFINED	0
+#define DRM_XE_VMA_ATOMIC_DEVICE	1
+#define DRM_XE_VMA_ATOMIC_GLOBAL	2
+		/** @atomic_val: atomic operation */
+		__u32 atomic_val;
+#define DRM_XE_VMA_PURGEABLE_STATE_WILLNEED	0
+#define DRM_XE_VMA_PURGEABLE_STATE_DONTNEED	1
+#define DRM_XE_VMA_PURGEABLE_STATE_PURGED	2
+		/** @purge_state_val: value for DRM_XE_VMA_ATTR_PURGEABLE_STATE */
+		__u32 purge_state_val;
+		/** @pat_index */
+		__u32 pat_index;
+		struct {
+			__u32 devmem_fd;
+			__u32 mem_region;
+		} preferred_mem_loc;
+	};
+	/** @reserved: Reserved */
+	__u64 reserved[2];
+};
+
+/**
+ * struct drm_xe_madvise - Input of &DRM_IOCTL_XE_MADVISE
+ *
+ * Set or get memory attributes to a virtual address range
+ */
+struct drm_xe_madvise {
+	/** @extensions: Pointer to the first extension struct, if any */
+	__u64 extensions;
+	/** @vm_id: vm_id of the virtual range */
+	__u32 vm_id;
+	/** @reserved: Reserved */
+	__u64 reserved[2];
+	/** @num_ops: number of madvises in ioctl */
+	__u32 num_ops;
+
+	union {
+		/** @ops: used if num_ops == 1 */
+		struct drm_xe_madvise_ops ops;
+
+		/**
+		 * @vector_of_ops: userptr to array of struct
+		 * drm_xe_vm_madvise_op if num_ops > 1
+		 */
+		__u64 vector_of_ops;
+	};
+};
+
 #if defined(__cplusplus)
 }
 #endif
-- 
2.34.1