[CI v3 09/26] drm/svm: add a mm field to drm_gpuvm struct

[Oak Zeng]

Add a mm_struct field to drm_gpuvm. This is only used by shared virtual memory,
where CPU program and GPU program share one process virtual address
space.

Cc: Matthew Brost <matthew.brost at intel.com>
Cc: Thomas Hellström <thomas.hellstrom 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/drm_gpuvm.c | 1 +
 include/drm/drm_gpuvm.h     | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/drm_gpuvm.c b/drivers/gpu/drm/drm_gpuvm.c
index 7402ed6f1d33..4b6fcaea635e 100644
--- a/drivers/gpu/drm/drm_gpuvm.c
+++ b/drivers/gpu/drm/drm_gpuvm.c
@@ -1015,6 +1015,7 @@ drm_gpuvm_init(struct drm_gpuvm *gpuvm, const char *name,
 	gpuvm->ops = ops;
 	gpuvm->drm = drm;
 	gpuvm->r_obj = r_obj;
+	gpuvm->mm = current->mm;
 
 	drm_gem_object_get(r_obj);
 
diff --git a/include/drm/drm_gpuvm.h b/include/drm/drm_gpuvm.h
index 429dc0d82eba..ee5729bbb8f7 100644
--- a/include/drm/drm_gpuvm.h
+++ b/include/drm/drm_gpuvm.h
@@ -242,6 +242,12 @@ struct drm_gpuvm {
 	 * @drm: the &drm_device this VM lives in
 	 */
 	struct drm_device *drm;
+	/**
+	 * @mm: the process &mm_struct which create this gpuvm.
+	 * This is only used for shared virtual memory where virtual
+	 * address space is shared b/t CPU and GPU program.
+	 */
+	struct mm_struct *mm;
 
 	/**
 	 * @mm_start: start of the VA space
-- 
2.26.3