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intel: Export a function to re-enable implicit synchronisation

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Implicit synchronisation is the default behaviour of the kernel when
rendering with an execobject. It may be disabled with
drm_intel_gem_bo_disable_implicit_sync(), and then to restore it use
drm_intel_gem_bo_enable_implicit_sync().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2017-01-27 20:25:04 +00:00
parent 22cfd04311
commit dfd536c60d
2 changed files with 20 additions and 0 deletions
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1
intel/intel_bufmgr.h
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@ -187,6 +187,7 @@ int drm_intel_gem_bo_unmap_gtt(drm_intel_bo *bo);
#define HAVE_DRM_INTEL_GEM_BO_DISABLE_IMPLICIT_SYNC 1
int drm_intel_bufmgr_gem_can_disable_implicit_sync(drm_intel_bufmgr *bufmgr);
void drm_intel_gem_bo_disable_implicit_sync(drm_intel_bo *bo);
void drm_intel_gem_bo_enable_implicit_sync(drm_intel_bo *bo);
void *drm_intel_gem_bo_map__cpu(drm_intel_bo *bo);
void *drm_intel_gem_bo_map__gtt(drm_intel_bo *bo);

19
intel/intel_bufmgr_gem.c
View file

@ -2815,6 +2815,25 @@ drm_intel_gem_bo_disable_implicit_sync(drm_intel_bo *bo)
bo_gem->kflags |= EXEC_OBJECT_ASYNC;
}
/**
* Enables implicit synchronisation before executing the bo
*
* This is the default behaviour of the kernel, to wait upon prior writes
* completing on the object before rendering with it, or to wait for prior
* reads to complete before writing into the object.
* drm_intel_gem_bo_disable_implicit_sync() can stop this behaviour, telling
* the kernel never to insert a stall before using the object. Then this
* function can be used to restore the implicit sync before subsequent
* rendering.
*/
void
drm_intel_gem_bo_enable_implicit_sync(drm_intel_bo *bo)
{
drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *) bo;
bo_gem->kflags &= ~EXEC_OBJECT_ASYNC;
}
/**
* Query whether the kernel supports disabling of its implicit synchronisation
* before execbuf. See drm_intel_gem_bo_disable_implicit_sync()