[PATCH 5/8] drm/xe/svm: Get xe memory region from page

[Oak Zeng <oak.zeng@intel.com>]

For gpu vram page, we now have a struct page backing of
it. struct page's pgmap points to xe_memory_region's
pagemap. This allow us to retrieve xe_memory_region
from struct page.

v1: move the function to xe_svm.h

Signed-off-by: Oak Zeng <oak.zeng@intel.com>
---
 drivers/gpu/drm/xe/xe_svm.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_svm.h b/drivers/gpu/drm/xe/xe_svm.h
index 8a34429eb674..624c1581f8ba 100644
--- a/drivers/gpu/drm/xe/xe_svm.h
+++ b/drivers/gpu/drm/xe/xe_svm.h
@@ -6,6 +6,7 @@
 #ifndef __XE_SVM_H
 #define __XE_SVM_H
 
+#include <linux/mm_types.h>
 #include "xe_device_types.h"
 #include "xe_device.h"
 #include "xe_assert.h"
@@ -35,4 +36,14 @@ static inline u64 xe_mem_region_pfn_to_dpa(struct xe_mem_region *mr, u64 pfn)
 int xe_devm_add(struct xe_tile *tile, struct xe_mem_region *mr);
 void xe_devm_remove(struct xe_tile *tile, struct xe_mem_region *mr);
 
+/**
+ * xe_page_to_mem_region() - Get a page's memory region
+ *
+ * @page: a struct page pointer pointing to a page in vram memory region
+ */
+static inline struct xe_mem_region *xe_page_to_mem_region(struct page *page)
+{
+	return container_of(page->pgmap, struct xe_mem_region, pagemap);
+}
+
 #endif
-- 
2.26.3