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drm/amdgpu/uapi: Introduce AMDGPU_GEM_DOMAIN_MMIO_REMAP 

Add a new GEM domain bit AMDGPU_GEM_DOMAIN_MMIO_REMAP to allow
userspace to request the MMIO remap (HDP flush) page via GEM_CREATE.

- include/uapi/drm/amdgpu_drm.h:
  * define AMDGPU_GEM_DOMAIN_MMIO_REMAP
  * include the bit in AMDGPU_GEM_DOMAIN_MASK

v2: Add early reject in amdgpu_gem_create_ioctl() (Alex).

Cc: Christian König <christian.koenig@amd.com>
Suggested-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
pull/1354/merge
Srinivasan Shanmugam 2025-08-20 12:33:29 +05:30 committed by Alex Deucher
parent 60df8a5d8f
commit 0561324837
2 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
View File

@ -457,6 +457,9 @@ int amdgpu_gem_create_ioctl(struct drm_device *dev, void *data,
/* always clear VRAM */
flags |= AMDGPU_GEM_CREATE_VRAM_CLEARED;
if (args->in.domains & AMDGPU_GEM_DOMAIN_MMIO_REMAP)
return -EINVAL;
/* create a gem object to contain this object in */
if (args->in.domains & (AMDGPU_GEM_DOMAIN_GDS |
AMDGPU_GEM_DOMAIN_GWS | AMDGPU_GEM_DOMAIN_OA)) {

8
include/uapi/drm/amdgpu_drm.h
View File

@ -105,6 +105,8 @@ extern "C" {
*
* %AMDGPU_GEM_DOMAIN_DOORBELL Doorbell. It is an MMIO region for
* signalling user mode queues.
*
* %AMDGPU_GEM_DOMAIN_MMIO_REMAP MMIO remap page (special mapping for HDP flushing).
*/
#define AMDGPU_GEM_DOMAIN_CPU 0x1
#define AMDGPU_GEM_DOMAIN_GTT 0x2
@ -113,13 +115,15 @@ extern "C" {
#define AMDGPU_GEM_DOMAIN_GWS 0x10
#define AMDGPU_GEM_DOMAIN_OA 0x20
#define AMDGPU_GEM_DOMAIN_DOORBELL 0x40
#define AMDGPU_GEM_DOMAIN_MMIO_REMAP 0x80
#define AMDGPU_GEM_DOMAIN_MASK (AMDGPU_GEM_DOMAIN_CPU | \
AMDGPU_GEM_DOMAIN_GTT | \
AMDGPU_GEM_DOMAIN_VRAM | \
AMDGPU_GEM_DOMAIN_GDS | \
AMDGPU_GEM_DOMAIN_GWS | \
AMDGPU_GEM_DOMAIN_OA | \
AMDGPU_GEM_DOMAIN_DOORBELL)
AMDGPU_GEM_DOMAIN_OA | \
AMDGPU_GEM_DOMAIN_DOORBELL | \
AMDGPU_GEM_DOMAIN_MMIO_REMAP)
/* Flag that CPU access will be required for the case of VRAM domain */
#define AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED (1 << 0)