From: Christopher James Halse Rogers christopher.halse.rogers@canonical.com
Migration to VRAM will break the sharing, resulting in rendering on the exporting GPU never becoming visible on the importing GPU.
v2: Don't pin BOs to GTT. Instead, refuse to migrate them out of GTT.
Signed-off-by: Christopher James Halse Rogers christopher.halse.rogers@canonical.com --- drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 5 +++++ drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 4 ++++ 2 files changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c index 106cf83c2e6b..bc5356d0a13d 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c @@ -679,6 +679,11 @@ int amdgpu_gem_op_ioctl(struct drm_device *dev, void *data, break; } case AMDGPU_GEM_OP_SET_PLACEMENT: + if (robj->prime_shared_count && (args->value & AMDGPU_GEM_DOMAIN_VRAM)) { + r = -EINVAL; + amdgpu_bo_unreserve(robj); + break; + } if (amdgpu_ttm_tt_get_usermm(robj->tbo.ttm)) { r = -EPERM; amdgpu_bo_unreserve(robj); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c index be80a4a68d7b..323580740a74 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c @@ -665,6 +665,10 @@ int amdgpu_bo_pin_restricted(struct amdgpu_bo *bo, u32 domain, if (WARN_ON_ONCE(min_offset > max_offset)) return -EINVAL;
+ /* A shared bo cannot be migrated to VRAM */ + if (bo->prime_shared_count && (domain == AMDGPU_GEM_DOMAIN_VRAM)) + return -EINVAL; + if (bo->pin_count) { uint32_t mem_type = bo->tbo.mem.mem_type;