linux-kernel - [PATCHv4 4/8] videobuf2: move cache

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Message-Id: <20210727070517.443167-5-senozhatsky@chromium.org>
Date:   Tue, 27 Jul 2021 16:05:13 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Tomasz Figa <tfiga@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Ricardo Ribalda <ribalda@...omium.org>,
        Christoph Hellwig <hch@....de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCHv4 4/8] videobuf2: move cache_hints handling to allocators

This moves cache hints handling from videobuf2 core down
to allocators level, because allocators do the sync/flush
caches eventually and may take better decisions. Besides,
allocators already decide whether cache sync/flush should
be done or can be skipped. This patch moves the scattered
buffer cache sync logic to one common place.

Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
---
 drivers/media/common/videobuf2/videobuf2-core.c       | 6 ------
 drivers/media/common/videobuf2/videobuf2-dma-contig.c | 6 ++++++
 drivers/media/common/videobuf2/videobuf2-dma-sg.c     | 6 ++++++
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 76210c006958..55af63d54f23 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -328,9 +328,6 @@ static void __vb2_buf_mem_prepare(struct vb2_buffer *vb)
 		return;
 
 	vb->synced = 1;
-	if (vb->skip_cache_sync_on_prepare)
-		return;
-
 	for (plane = 0; plane < vb->num_planes; ++plane)
 		call_void_memop(vb, prepare, vb->planes[plane].mem_priv);
 }
@@ -347,9 +344,6 @@ static void __vb2_buf_mem_finish(struct vb2_buffer *vb)
 		return;
 
 	vb->synced = 0;
-	if (vb->skip_cache_sync_on_finish)
-		return;
-
 	for (plane = 0; plane < vb->num_planes; ++plane)
 		call_void_memop(vb, finish, vb->planes[plane].mem_priv);
 }
diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
index 019c3843dc6d..1e218bc440c6 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
@@ -101,6 +101,9 @@ static void vb2_dc_prepare(void *buf_priv)
 	struct vb2_dc_buf *buf = buf_priv;
 	struct sg_table *sgt = buf->dma_sgt;
 
+	if (buf->vb->skip_cache_sync_on_prepare)
+		return;
+
 	if (!sgt)
 		return;
 
@@ -112,6 +115,9 @@ static void vb2_dc_finish(void *buf_priv)
 	struct vb2_dc_buf *buf = buf_priv;
 	struct sg_table *sgt = buf->dma_sgt;
 
+	if (buf->vb->skip_cache_sync_on_finish)
+		return;
+
 	if (!sgt)
 		return;
 
diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
index 50265080cfc8..33ee63a99139 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
@@ -204,6 +204,9 @@ static void vb2_dma_sg_prepare(void *buf_priv)
 	struct vb2_dma_sg_buf *buf = buf_priv;
 	struct sg_table *sgt = buf->dma_sgt;
 
+	if (buf->vb->skip_cache_sync_on_prepare)
+		return;
+
 	dma_sync_sgtable_for_device(buf->dev, sgt, buf->dma_dir);
 }
 
@@ -212,6 +215,9 @@ static void vb2_dma_sg_finish(void *buf_priv)
 	struct vb2_dma_sg_buf *buf = buf_priv;
 	struct sg_table *sgt = buf->dma_sgt;
 
+	if (buf->vb->skip_cache_sync_on_finish)
+		return;
+
 	dma_sync_sgtable_for_cpu(buf->dev, sgt, buf->dma_dir);
 }
 
-- 
2.32.0.432.gabb21c7263-goog