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authorChristian König <christian.koenig@amd.com>2021-06-15 16:10:03 +0300
committerChristian König <christian.koenig@amd.com>2021-10-07 15:49:11 +0300
commit5baaac3184ab896d74993825858f1b1a46c460ce (patch)
tree237b794f7a37d8a4abcfba5e3cc4962bf5fae5e5 /drivers/dma-buf
parenta0a33067b957dfab876ae26b32695f09cdc2706d (diff)
downloadlinux-5baaac3184ab896d74993825858f1b1a46c460ce.tar.xz
dma-buf: add dma_resv_for_each_fence v3
A simpler version of the iterator to be used when the dma_resv object is locked. v2: fix index check here as well v3: minor coding improvement, some documentation cleanup Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211006123609.2026-1-christian.koenig@amd.com
Diffstat (limited to 'drivers/dma-buf')
-rw-r--r--drivers/dma-buf/dma-resv.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index a480af9581bd..2f98caa68ae5 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -424,6 +424,57 @@ struct dma_fence *dma_resv_iter_next_unlocked(struct dma_resv_iter *cursor)
EXPORT_SYMBOL(dma_resv_iter_next_unlocked);
/**
+ * dma_resv_iter_first - first fence from a locked dma_resv object
+ * @cursor: cursor to record the current position
+ *
+ * Return the first fence in the dma_resv object while holding the
+ * &dma_resv.lock.
+ */
+struct dma_fence *dma_resv_iter_first(struct dma_resv_iter *cursor)
+{
+ struct dma_fence *fence;
+
+ dma_resv_assert_held(cursor->obj);
+
+ cursor->index = 0;
+ if (cursor->all_fences)
+ cursor->fences = dma_resv_shared_list(cursor->obj);
+ else
+ cursor->fences = NULL;
+
+ fence = dma_resv_excl_fence(cursor->obj);
+ if (!fence)
+ fence = dma_resv_iter_next(cursor);
+
+ cursor->is_restarted = true;
+ return fence;
+}
+EXPORT_SYMBOL_GPL(dma_resv_iter_first);
+
+/**
+ * dma_resv_iter_next - next fence from a locked dma_resv object
+ * @cursor: cursor to record the current position
+ *
+ * Return the next fences from the dma_resv object while holding the
+ * &dma_resv.lock.
+ */
+struct dma_fence *dma_resv_iter_next(struct dma_resv_iter *cursor)
+{
+ unsigned int idx;
+
+ dma_resv_assert_held(cursor->obj);
+
+ cursor->is_restarted = false;
+ if (!cursor->fences || cursor->index >= cursor->fences->shared_count)
+ return NULL;
+
+ idx = cursor->index++;
+ return rcu_dereference_protected(cursor->fences->shared[idx],
+ dma_resv_held(cursor->obj));
+}
+EXPORT_SYMBOL_GPL(dma_resv_iter_next);
+
+/**
* dma_resv_copy_fences - Copy all fences from src to dst.
* @dst: the destination reservation object
* @src: the source reservation object