[PATCH v2 1/5] drm/gpusvm: Introduce vram_only flag for VRAM allocation

[Matthew Brost <matthew.brost@intel.com>]

From: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>

This commit adds a new flag, vram_only, to the drm_gpusvm structure. The
purpose of this flag is to ensure that the get_pages function allocates
memory exclusively from the device's VRAM. If the allocation from VRAM
fails, the function will return an -EFAULT error.

Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
---
 drivers/gpu/drm/drm_gpusvm.c | 5 +++++
 include/drm/drm_gpusvm.h     | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/drm_gpusvm.c b/drivers/gpu/drm/drm_gpusvm.c
index 38431e8360e7..e7d4ada21560 100644
--- a/drivers/gpu/drm/drm_gpusvm.c
+++ b/drivers/gpu/drm/drm_gpusvm.c
@@ -1454,6 +1454,11 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
 				goto err_unmap;
 			}
 
+			if (ctx->vram_only) {
+				err = -EFAULT;
+				goto err_unmap;
+			}
+
 			addr = dma_map_page(gpusvm->drm->dev,
 					    page, 0,
 					    PAGE_SIZE << order,
diff --git a/include/drm/drm_gpusvm.h b/include/drm/drm_gpusvm.h
index df120b4d1f83..8093cc6ab1f4 100644
--- a/include/drm/drm_gpusvm.h
+++ b/include/drm/drm_gpusvm.h
@@ -286,6 +286,7 @@ struct drm_gpusvm {
  * @in_notifier: entering from a MMU notifier
  * @read_only: operating on read-only memory
  * @devmem_possible: possible to use device memory
+ * @vram_only: Use only device memory
  *
  * Context that is DRM GPUSVM is operating in (i.e. user arguments).
  */
@@ -294,6 +295,7 @@ struct drm_gpusvm_ctx {
 	unsigned int in_notifier :1;
 	unsigned int read_only :1;
 	unsigned int devmem_possible :1;
+	unsigned int vram_only :1;
 };
 
 int drm_gpusvm_init(struct drm_gpusvm *gpusvm,
-- 
2.34.1