[CI 35/43] drm/xe/svm: Get page map owner of a memory region

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

Introduce function xe_svm_mem_region_to_pagemap_owner to
get a memory region's page map owner.

Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Brian Welty <brian.welty@intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Signed-off-by: Oak Zeng <oak.zeng@intel.com>
---
 drivers/gpu/drm/xe/xe_svm.c | 8 ++++++++
 drivers/gpu/drm/xe/xe_svm.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index a2c52f205ea0..d2838ce46eaf 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -146,3 +146,11 @@ int xe_svm_alloc_pages(struct drm_mem_region *mr,
 
 	return ret;
 }
+
+void* xe_svm_mem_region_to_pagemap_owner(struct drm_mem_region *mr)
+{
+	struct xe_mem_region *xe_mr = container_of(mr, struct xe_mem_region, drm_mr);
+	struct xe_tile *tile = xe_mem_region_to_tile(xe_mr);
+
+	return tile->xe;
+}
diff --git a/drivers/gpu/drm/xe/xe_svm.h b/drivers/gpu/drm/xe/xe_svm.h
index 09fef8ea97f3..b70551d12578 100644
--- a/drivers/gpu/drm/xe/xe_svm.h
+++ b/drivers/gpu/drm/xe/xe_svm.h
@@ -12,5 +12,6 @@ struct page;
 int xe_svm_alloc_pages(struct drm_mem_region *mr,
             unsigned long npages, unsigned long *pfn);
 void xe_svm_free_page(struct page *page);
+void* xe_svm_mem_region_to_pagemap_owner(struct drm_mem_region *mr);
 
 #endif
-- 
2.26.3