From: Christian König ckoenig.leichtzumerken@gmail.com
Use the dma_fence_chain object to create a timeline of fence objects instead of just replacing the existing fence.
v2: rebase and cleanup v3: fix garbage collection parameters v4: add unorder point check, print a warn calltrace
Signed-off-by: Christian König christian.koenig@amd.com Cc: Lionel Landwerlin lionel.g.landwerlin@intel.com Reviewed-by: Lionel Landwerlin lionel.g.landwerlin@intel.com --- drivers/gpu/drm/drm_syncobj.c | 40 +++++++++++++++++++++++++++++++++++ include/drm/drm_syncobj.h | 5 +++++ 2 files changed, 45 insertions(+)
diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c index 5329e66598c6..dbe4a1c75fbc 100644 --- a/drivers/gpu/drm/drm_syncobj.c +++ b/drivers/gpu/drm/drm_syncobj.c @@ -122,6 +122,46 @@ static void drm_syncobj_remove_wait(struct drm_syncobj *syncobj, spin_unlock(&syncobj->lock); }
+/** + * drm_syncobj_add_point - add new timeline point to the syncobj + * @syncobj: sync object to add timeline point do + * @chain: chain node to use to add the point + * @fence: fence to encapsulate in the chain node + * @point: sequence number to use for the point + * + * Add the chain node as new timeline point to the syncobj. + */ +void drm_syncobj_add_point(struct drm_syncobj *syncobj, + struct dma_fence_chain *chain, + struct dma_fence *fence, + uint64_t point) +{ + struct syncobj_wait_entry *cur, *tmp; + struct dma_fence *prev; + + dma_fence_get(fence); + + spin_lock(&syncobj->lock); + + prev = drm_syncobj_fence_get(syncobj); + /* You are adding an unorder point to timeline, which could cause payload returned from query_ioctl is 0! */ + if (prev && prev->seqno >= point) + DRM_ERROR("You are adding an unorder point to timeline!\n"); + dma_fence_chain_init(chain, prev, fence, point); + rcu_assign_pointer(syncobj->fence, &chain->base); + + list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node) { + list_del_init(&cur->node); + syncobj_wait_syncobj_func(syncobj, cur); + } + spin_unlock(&syncobj->lock); + + /* Walk the chain once to trigger garbage collection */ + dma_fence_chain_for_each(fence, prev); + dma_fence_put(prev); +} +EXPORT_SYMBOL(drm_syncobj_add_point); + /** * drm_syncobj_replace_fence - replace fence in a sync object. * @syncobj: Sync object to replace fence in diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h index 0311c9fdbd2f..6cf7243a1dc5 100644 --- a/include/drm/drm_syncobj.h +++ b/include/drm/drm_syncobj.h @@ -27,6 +27,7 @@ #define __DRM_SYNCOBJ_H__
#include <linux/dma-fence.h> +#include <linux/dma-fence-chain.h>
struct drm_file;
@@ -112,6 +113,10 @@ drm_syncobj_fence_get(struct drm_syncobj *syncobj)
struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private, u32 handle); +void drm_syncobj_add_point(struct drm_syncobj *syncobj, + struct dma_fence_chain *chain, + struct dma_fence *fence, + uint64_t point); void drm_syncobj_replace_fence(struct drm_syncobj *syncobj, struct dma_fence *fence); int drm_syncobj_find_fence(struct drm_file *file_private,