Commit 03f9016e authored by Andrey Grodzovsky's avatar Andrey Grodzovsky
Browse files

drm/amdgpu: Remap all page faults to per process dummy page. 



On device removal reroute all CPU mappings to dummy page
per drm_file instance or imported GEM object.

v4:
Update for modified ttm_bo_vm_dummy_page

Signed-off-by: default avatarAndrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210512142648.666476-7-andrey.grodzovsky@amd.com
parent d10d0daa

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

+16 −5
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ 
#include <drm/ttm/ttm_placement.h>



#include <drm/amdgpu_drm.h>

#include <drm/drm_drv.h>



#include "amdgpu.h"

#include "amdgpu_object.h"
@@ -1905,18 +1906,28 @@ void amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable) 
static vm_fault_t amdgpu_ttm_fault(struct vm_fault *vmf)

{

	struct ttm_buffer_object *bo = vmf->vma->vm_private_data;

	struct drm_device *ddev = bo->base.dev;

	vm_fault_t ret;

	int idx;



	ret = ttm_bo_vm_reserve(bo, vmf);

	if (ret)

		return ret;



	if (drm_dev_enter(ddev, &idx)) {

		ret = amdgpu_bo_fault_reserve_notify(bo);

	if (ret)

		if (ret) {

			drm_dev_exit(idx);

			goto unlock;

		}



		 ret = ttm_bo_vm_fault_reserved(vmf, vmf->vma->vm_page_prot,

						TTM_BO_VM_NUM_PREFAULT, 1);



		 drm_dev_exit(idx);

	} else {

		ret = ttm_bo_vm_dummy_page(vmf, vmf->vma->vm_page_prot);

	}

	if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))

		return ret;