[CI 37/42] drm/xe/svm: Register xe memory region to drm layer

[Oak Zeng]

Register xe memory region to drm layer for SVM purpose.
This will essentially create struct page backing for
xe device memory, which will be used by SVM functions.

Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Cc: Brian Welty <brian.welty at intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
Signed-off-by: Oak Zeng <oak.zeng at intel.com>
---
 drivers/gpu/drm/xe/xe_tile.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_tile.c b/drivers/gpu/drm/xe/xe_tile.c
index 109f3118e821..6c50df281b11 100644
--- a/drivers/gpu/drm/xe/xe_tile.c
+++ b/drivers/gpu/drm/xe/xe_tile.c
@@ -3,7 +3,9 @@
  * Copyright © 2023 Intel Corporation
  */
 
+#include <linux/memremap.h>
 #include <drm/drm_managed.h>
+#include <drm/drm_svm.h>
 
 #include "xe_device.h"
 #include "xe_ggtt.h"
@@ -14,6 +16,7 @@
 #include "xe_tile_sysfs.h"
 #include "xe_ttm_vram_mgr.h"
 #include "xe_wa.h"
+#include "xe_svm.h"
 
 /**
  * DOC: Multi-tile Design
@@ -142,6 +145,15 @@ static int tile_ttm_mgr_init(struct xe_tile *tile)
 	return 0;
 }
 
+static void __init_drm_mem_region_ops(struct drm_mem_region_ops *ops)
+{
+	ops->drm_mem_region_alloc_pages = &xe_svm_alloc_pages;
+	ops->drm_mem_region_free_page = &xe_svm_free_page;
+	ops->drm_mem_region_migrate = &xe_svm_migrate;
+	ops->drm_mem_region_pagemap_owner = &xe_svm_mem_region_to_pagemap_owner;
+	ops->drm_mem_region_get_device = &xe_mem_region_to_device;
+}
+
 /**
  * xe_tile_init_noalloc - Init tile up to the point where allocations can happen.
  * @tile: The tile to initialize.
@@ -159,6 +171,8 @@ static int tile_ttm_mgr_init(struct xe_tile *tile)
 int xe_tile_init_noalloc(struct xe_tile *tile)
 {
 	int err;
+	struct xe_device *xe = tile_to_xe(tile);
+	struct drm_device *drm = &xe->drm;
 
 	err = tile_ttm_mgr_init(tile);
 	if (err)
@@ -172,6 +186,11 @@ int xe_tile_init_noalloc(struct xe_tile *tile)
 
 	err = xe_tile_sysfs_init(tile);
 
+	if (xe->info.has_usm) {
+		__init_drm_mem_region_ops(&tile->mem.vram.drm_mr.mr_ops);
+		drm_svm_register_mem_region(drm, &tile->mem.vram.drm_mr, MEMORY_DEVICE_PRIVATE);
+	}
+
 	return 0;
 }
 
-- 
2.26.3