From: Himal Prasad Ghimiray <himal.prasad.ghimi...@intel.com>
This commit adds a new flag, devmem_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 memory. If the allocation from
device memory fails, the function will return an -EFAULT error.
v3:
- s/vram_only/devmem_only/
Signed-off-by: Matthew Brost <matthew.br...@intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimi...@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..edf107809d20 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->devmem_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..9fd25fc880a4 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
+ * @devmem_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 devmem_only :1;
};
int drm_gpusvm_init(struct drm_gpusvm *gpusvm,
--
2.34.1
