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drm/amdgpu: introduce AMDGPU_GEM_CREATE_EXPLICIT_SYNC v2

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Introduce a flag to signal that access to a BO will be synchronized
through an external mechanism.

Currently all buffers shared between contexts are subject to implicit
synchronization. However, this is only required for protocols that
currently don't support an explicit synchronization mechanism (DRI2/3).

This patch introduces the AMDGPU_GEM_CREATE_EXPLICIT_SYNC, so that
users can specify when it is safe to disable implicit sync.

v2: only disable explicit sync in amdgpu_cs_ioctl

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Andres Rodriguez <andresx7@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Andres Rodriguez
2017-09-15 20:44:06 -04:00
committed by Alex Deucher
parent b82485fd38
commit 177ae09b5d
8 changed files with 29 additions and 11 deletions
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2
include/uapi/drm/amdgpu_drm.h
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@@ -91,6 +91,8 @@ extern "C" {
#define AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS (1 << 5)
/* Flag that BO is always valid in this VM */
#define AMDGPU_GEM_CREATE_VM_ALWAYS_VALID (1 << 6)
/* Flag that BO sharing will be explicitly synchronized */
#define AMDGPU_GEM_CREATE_EXPLICIT_SYNC (1 << 7)
struct drm_amdgpu_gem_create_in {
/** the requested memory size */