[Intel-gfx] [PATCH] intel: Adding locks for drm objects synchronization.
Daniel Vetter
daniel at ffwll.ch
Thu Sep 18 14:43:38 CEST 2014
On Tue, Aug 05, 2014 at 02:51:38PM -0400, Rafal Sapala wrote:
> The changes make sure that members of the bufmgr_gem and bo_gem
> name lists are sychronized between threads
> when using the create from prime and create from name methods.
>
> Signed-off-by: Rafal Sapala <rafal.a.sapala at intel.com>
> ---
> intel/intel_bufmgr_gem.c | 28 ++++++++++++++++++++++++----
> 1 files changed, 24 insertions(+), 4 deletions(-)
>
> diff --git a/intel/intel_bufmgr_gem.c b/intel/intel_bufmgr_gem.c
> index 007a6d8..243f563 100644
> --- a/intel/intel_bufmgr_gem.c
> +++ b/intel/intel_bufmgr_gem.c
> @@ -871,12 +871,14 @@ drm_intel_bo_gem_create_from_name(drm_intel_bufmgr *bufmgr,
> * alternating names for the front/back buffer a linear search
> * provides a sufficiently fast match.
> */
> + pthread_mutex_lock(&bufmgr_gem->lock);
> for (list = bufmgr_gem->named.next;
> list != &bufmgr_gem->named;
> list = list->next) {
> bo_gem = DRMLISTENTRY(drm_intel_bo_gem, list, name_list);
> if (bo_gem->global_name == handle) {
> drm_intel_gem_bo_reference(&bo_gem->bo);
> + pthread_mutex_unlock(&bufmgr_gem->lock);
> return &bo_gem->bo;
> }
> }
> @@ -889,6 +891,7 @@ drm_intel_bo_gem_create_from_name(drm_intel_bufmgr *bufmgr,
> if (ret != 0) {
> DBG("Couldn't reference %s handle 0x%08x: %s\n",
> name, handle, strerror(errno));
> + pthread_mutex_unlock(&bufmgr_gem->lock);
> return NULL;
> }
> /* Now see if someone has used a prime handle to get this
> @@ -901,13 +904,16 @@ drm_intel_bo_gem_create_from_name(drm_intel_bufmgr *bufmgr,
> bo_gem = DRMLISTENTRY(drm_intel_bo_gem, list, name_list);
> if (bo_gem->gem_handle == open_arg.handle) {
> drm_intel_gem_bo_reference(&bo_gem->bo);
> + pthread_mutex_unlock(&bufmgr_gem->lock);
> return &bo_gem->bo;
> }
> }
>
> bo_gem = calloc(1, sizeof(*bo_gem));
> - if (!bo_gem)
> + if (!bo_gem) {
> + pthread_mutex_unlock(&bufmgr_gem->lock);
> return NULL;
> + }
>
> bo_gem->bo.size = open_arg.size;
> bo_gem->bo.offset = 0;
> @@ -929,6 +935,7 @@ drm_intel_bo_gem_create_from_name(drm_intel_bufmgr *bufmgr,
> &get_tiling);
> if (ret != 0) {
> drm_intel_gem_bo_unreference(&bo_gem->bo);
> + pthread_mutex_unlock(&bufmgr_gem->lock);
> return NULL;
> }
> bo_gem->tiling_mode = get_tiling.tiling_mode;
> @@ -938,6 +945,7 @@ drm_intel_bo_gem_create_from_name(drm_intel_bufmgr *bufmgr,
>
> DRMINITLISTHEAD(&bo_gem->vma_list);
> DRMLISTADDTAIL(&bo_gem->name_list, &bufmgr_gem->named);
> + pthread_mutex_unlock(&bufmgr_gem->lock);
> DBG("bo_create_from_handle: %d (%s)\n", handle, bo_gem->name);
>
> return &bo_gem->bo;
> @@ -2502,25 +2510,29 @@ drm_intel_bo_gem_create_from_prime(drm_intel_bufmgr *bufmgr, int prime_fd, int s
> * for named buffers, we must not create two bo's pointing at the same
> * kernel object
> */
> + pthread_mutex_lock(&bufmgr_gem->lock);
> for (list = bufmgr_gem->named.next;
> list != &bufmgr_gem->named;
> list = list->next) {
> bo_gem = DRMLISTENTRY(drm_intel_bo_gem, list, name_list);
> if (bo_gem->gem_handle == handle) {
> drm_intel_gem_bo_reference(&bo_gem->bo);
> + pthread_mutex_unlock(&bufmgr_gem->lock);
> return &bo_gem->bo;
> }
> }
>
> if (ret) {
> fprintf(stderr,"ret is %d %d\n", ret, errno);
> + pthread_mutex_unlock(&bufmgr_gem->lock);
> return NULL;
> }
>
> bo_gem = calloc(1, sizeof(*bo_gem));
> - if (!bo_gem)
> + if (!bo_gem) {
> + pthread_mutex_unlock(&bufmgr_gem->lock);
> return NULL;
> -
> + }
> /* Determine size of bo. The fd-to-handle ioctl really should
> * return the size, but it doesn't. If we have kernel 3.12 or
> * later, we can lseek on the prime fd to get the size. Older
> @@ -2548,6 +2560,7 @@ drm_intel_bo_gem_create_from_prime(drm_intel_bufmgr *bufmgr, int prime_fd, int s
>
> DRMINITLISTHEAD(&bo_gem->vma_list);
> DRMLISTADDTAIL(&bo_gem->name_list, &bufmgr_gem->named);
> + pthread_mutex_unlock(&bufmgr_gem->lock);
>
> VG_CLEAR(get_tiling);
> get_tiling.handle = bo_gem->gem_handle;
> @@ -2572,8 +2585,10 @@ drm_intel_bo_gem_export_to_prime(drm_intel_bo *bo, int *prime_fd)
> drm_intel_bufmgr_gem *bufmgr_gem = (drm_intel_bufmgr_gem *) bo->bufmgr;
> drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *) bo;
>
> + pthread_mutex_lock(&bufmgr_gem->lock);
> if (DRMLISTEMPTY(&bo_gem->name_list))
> DRMLISTADDTAIL(&bo_gem->name_list, &bufmgr_gem->named);
> + pthread_mutex_unlock(&bufmgr_gem->lock);
>
> if (drmPrimeHandleToFD(bufmgr_gem->fd, bo_gem->gem_handle,
> DRM_CLOEXEC, prime_fd) != 0)
> @@ -2597,15 +2612,20 @@ drm_intel_gem_bo_flink(drm_intel_bo *bo, uint32_t * name)
> VG_CLEAR(flink);
> flink.handle = bo_gem->gem_handle;
>
> + pthread_mutex_lock(&bufmgr_gem->lock);
> +
> ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_GEM_FLINK, &flink);
> - if (ret != 0)
> + if (ret != 0) {
> + pthread_mutex_unlock(&bufmgr_gem->lock);
> return -errno;
> + }
>
> bo_gem->global_name = flink.name;
> bo_gem->reusable = false;
>
> if (DRMLISTEMPTY(&bo_gem->name_list))
> DRMLISTADDTAIL(&bo_gem->name_list, &bufmgr_gem->named);
> + pthread_mutex_unlock(&bufmgr_gem->lock);
> }
>
> *name = bo_gem->global_name;
> --
> 1.7.1
>
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I can't merge patches with this disclaimer ...
Patch looks good otherwise. Is there a testcase for it? As long as it's a
stand-alone C testcase I can easily do the integration with igt myself
quickly.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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