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From: Jason Ekstrand <jason@jlekstrand.net>
Cc: "Kate Stewart" <kstewart@linuxfoundation.org>,
	daniel.vetter@ffwll.ch, dri-devel@lists.freedesktop.org,
	"Richard Fontana" <rfontana@redhat.com>,
	"Jason Ekstrand" <jason@jlekstrand.net>,
	jessehall@google.com, jajones@nvidia.com,
	"Greg Hackmann" <ghackmann@google.com>,
	"Gustavo Padovan" <gustavo@padovan.org>,
	airlied@redhat.com, linux-media@vger.kernel.org,
	daniels@collabora.com,
	"Christian König" <ckoenig.leichtzumerken@gmail.com>,
	"Chenbo Feng" <fengc@google.com>,
	linaro-mm-sig@lists.linaro.org,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Allison Randal" <allison@lohutok.net>,
	linux-kernel@vger.kernel.org, hoegsberg@google.com,
	christian.koenig@amd.com
Subject: [PATCH 1/3] dma-buf: add dma_fence_array_for_each (v2)
Date: Tue, 10 Mar 2020 22:43:46 -0500	[thread overview]
Message-ID: <20200311034351.1275197-1-jason@jlekstrand.net> (raw)
In-Reply-To: <20200303190318.522103-1-jason@jlekstrand.net>

From: Christian König <ckoenig.leichtzumerken@gmail.com>

Add a helper to iterate over all fences in a dma_fence_array object.

v2 (Jason Ekstrand)
 - Return NULL from dma_fence_array_first if head == NULL.  This matches
   the iterator behavior of dma_fence_chain_for_each in that it iterates
   zero times if head == NULL.
 - Return NULL from dma_fence_array_next if index > array->num_fences.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
---
 drivers/dma-buf/dma-fence-array.c | 27 +++++++++++++++++++++++++++
 include/linux/dma-fence-array.h   | 17 +++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c
index d3fbd950be94..2ac1afc697d0 100644
--- a/drivers/dma-buf/dma-fence-array.c
+++ b/drivers/dma-buf/dma-fence-array.c
@@ -201,3 +201,30 @@ bool dma_fence_match_context(struct dma_fence *fence, u64 context)
 	return true;
 }
 EXPORT_SYMBOL(dma_fence_match_context);
+
+struct dma_fence *dma_fence_array_first(struct dma_fence *head)
+{
+	struct dma_fence_array *array;
+
+	if (!head)
+		return NULL;
+
+	array = to_dma_fence_array(head);
+	if (!array)
+		return head;
+
+	return array->fences[0];
+}
+EXPORT_SYMBOL(dma_fence_array_first);
+
+struct dma_fence *dma_fence_array_next(struct dma_fence *head,
+				       unsigned int index)
+{
+	struct dma_fence_array *array = to_dma_fence_array(head);
+
+	if (!array || index >= array->num_fences)
+		return NULL;
+
+	return array->fences[index];
+}
+EXPORT_SYMBOL(dma_fence_array_next);
diff --git a/include/linux/dma-fence-array.h b/include/linux/dma-fence-array.h
index 303dd712220f..588ac8089dd6 100644
--- a/include/linux/dma-fence-array.h
+++ b/include/linux/dma-fence-array.h
@@ -74,6 +74,19 @@ to_dma_fence_array(struct dma_fence *fence)
 	return container_of(fence, struct dma_fence_array, base);
 }
 
+/**
+ * dma_fence_array_for_each - iterate over all fences in array
+ * @fence: current fence
+ * @index: index into the array
+ * @head: potential dma_fence_array object
+ *
+ * Test if @array is a dma_fence_array object and if yes iterate over all fences
+ * in the array. If not just iterate over the fence in @array itself.
+ */
+#define dma_fence_array_for_each(fence, index, head)			\
+	for (index = 0, fence = dma_fence_array_first(head); fence;	\
+	     ++(index), fence = dma_fence_array_next(head, index))
+
 struct dma_fence_array *dma_fence_array_create(int num_fences,
 					       struct dma_fence **fences,
 					       u64 context, unsigned seqno,
@@ -81,4 +94,8 @@ struct dma_fence_array *dma_fence_array_create(int num_fences,
 
 bool dma_fence_match_context(struct dma_fence *fence, u64 context);
 
+struct dma_fence *dma_fence_array_first(struct dma_fence *head);
+struct dma_fence *dma_fence_array_next(struct dma_fence *head,
+				       unsigned int index);
+
 #endif /* __LINUX_DMA_FENCE_ARRAY_H */
-- 
2.24.1

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  parent reply	other threads:[~2020-03-11  3:44 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-25 23:58 [PATCH] RFC: dma-buf: Add an API for importing and exporting sync files Jason Ekstrand
2020-02-26  9:16 ` Christian König
2020-02-26 10:05   ` Daniel Vetter
2020-02-26 15:28     ` Jason Ekstrand
2020-02-26 16:46       ` Bas Nieuwenhuizen
2020-02-27  8:28         ` Christian König
2020-03-03 19:10           ` Jason Ekstrand
2020-03-04  8:34             ` Christian König
2020-03-04 16:27               ` Jason Ekstrand
2020-03-04 16:41                 ` Jason Ekstrand
2020-03-05 13:06                   ` Christian König
2020-03-05 15:54                     ` Jason Ekstrand
2020-03-09 16:21                       ` Christian König
2020-03-11  3:43                         ` Jason Ekstrand
2020-02-26 18:09 ` [PATCH] RFC: dma-buf: Add an API for importing and exporting sync files (v2) Jason Ekstrand
2020-03-03 19:03   ` [PATCH] RFC: dma-buf: Add an API for importing and exporting sync files (v3) Jason Ekstrand
2020-03-03 19:05     ` Jason Ekstrand
2020-03-11  3:43     ` Jason Ekstrand [this message]
2020-03-11  3:43       ` [PATCH 2/3] dma-buf: add dma_resv_get_singleton (v2) Jason Ekstrand
2020-03-11  3:43       ` [PATCH 3/3] RFC: dma-buf: Add an API for importing and exporting sync files (v4) Jason Ekstrand
2020-03-11 13:18         ` Christian König
2020-03-12 15:57           ` Jason Ekstrand
2020-03-13 10:33             ` Christian König
2020-03-17 21:21         ` [PATCH 3/3] RFC: dma-buf: Add an API for importing and exporting sync files (v5) Jason Ekstrand
2020-09-30  9:39           ` Michel Dänzer
2020-09-30  9:55             ` Daniel Vetter
2021-03-15 21:11               ` Jason Ekstrand
2021-03-15 21:30                 ` Daniel Vetter
2021-03-15 21:04           ` [PATCH 0/3] dma-buf: Add an API for exporting sync files (v6) Jason Ekstrand
2021-03-15 21:04             ` [PATCH 1/3] dma-buf: add dma_fence_array_for_each (v2) Jason Ekstrand
2021-03-15 21:04             ` [PATCH 2/3] dma-buf: add dma_resv_get_singleton (v2) Jason Ekstrand
2021-03-15 21:04             ` [PATCH 3/3] dma-buf: Add an API for exporting sync files (v6) Jason Ekstrand
2021-03-15 23:10               ` Jason Ekstrand
2021-03-16  8:51                 ` Michel Dänzer
2021-03-16 14:35                   ` Jason Ekstrand
2021-03-16  0:10               ` kernel test robot
2021-03-16  2:37               ` kernel test robot
2021-03-16  0:15             ` [PATCH 0/3] " Jason Ekstrand
2021-03-16  4:53             ` [PATCH 0/3] dma-buf: Add an API for exporting sync files (v7) Jason Ekstrand
2021-03-16  4:53               ` [PATCH 1/3] dma-buf: add dma_fence_array_for_each (v2) Jason Ekstrand
2021-03-16  4:53               ` [PATCH 2/3] dma-buf: add dma_resv_get_singleton_rcu (v3) Jason Ekstrand
2021-03-16  4:53               ` [PATCH 3/3] dma-buf: Add an API for exporting sync files (v7) Jason Ekstrand
2021-03-16  8:06                 ` kernel test robot
2021-03-17 22:19               ` [PATCH 0/3] dma-buf: Add an API for exporting sync files (v8) Jason Ekstrand
2021-03-17 22:19                 ` [PATCH 1/3] dma-buf: add dma_fence_array_for_each (v2) Jason Ekstrand
2021-03-18  9:38                   ` Christian König
2021-03-18 13:13                     ` Daniel Vetter
2021-03-19  1:40                       ` Jason Ekstrand
2021-03-17 22:19                 ` [PATCH 2/3] dma-buf: add dma_resv_get_singleton_rcu (v3) Jason Ekstrand
2021-03-17 22:19                 ` [PATCH 3/3] dma-buf: Add an API for exporting sync files (v8) Jason Ekstrand
2021-03-23 17:57                   ` Jason Ekstrand
2021-03-23 19:06                     ` Simon Ser
2021-03-23 19:34                       ` Jason Ekstrand

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