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media: videobuf2: inverse buffer cache_hints flags

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It would be less error prone if the default cache hints value
(we kzalloc() structs, so it's zeroed out by default) would be
to "always sync/flush" caches. Inverse and rename cache hints
flags.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Sergey Senozhatsky 2021-09-09 13:24:24 +02:00 committed by Mauro Carvalho Chehab
parent a4b83deb3e
commit 4dbe7eab95
3 changed files with 21 additions and 39 deletions
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31
drivers/media/common/videobuf2/videobuf2-core.c
View file

@ -327,12 +327,12 @@ static void __vb2_buf_mem_prepare(struct vb2_buffer *vb)
if (vb->synced)
return;
if (vb->need_cache_sync_on_prepare) {
for (plane = 0; plane < vb->num_planes; ++plane)
call_void_memop(vb, prepare,
vb->planes[plane].mem_priv);
}
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);
}
/*
@ -346,12 +346,12 @@ static void __vb2_buf_mem_finish(struct vb2_buffer *vb)
if (!vb->synced)
return;
if (vb->need_cache_sync_on_finish) {
for (plane = 0; plane < vb->num_planes; ++plane)
call_void_memop(vb, finish,
vb->planes[plane].mem_priv);
}
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);
}
/*
@ -415,17 +415,6 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
vb->index = q->num_buffers + buffer;
vb->type = q->type;
vb->memory = memory;
/*
* We need to set these flags here so that the videobuf2 core
* will call ->prepare()/->finish() cache sync/flush on vb2
* buffers when appropriate. However, we can avoid explicit
* ->prepare() and ->finish() cache sync for DMABUF buffers,
* because DMA exporter takes care of it.
*/
if (q->memory != VB2_MEMORY_DMABUF) {
vb->need_cache_sync_on_prepare = 1;
vb->need_cache_sync_on_finish = 1;
}
for (plane = 0; plane < num_planes; ++plane) {
vb->planes[plane].length = plane_sizes[plane];
vb->planes[plane].min_length = plane_sizes[plane];

17
drivers/media/common/videobuf2/videobuf2-v4l2.c
View file

@ -351,18 +351,11 @@ static void set_buffer_cache_hints(struct vb2_queue *q,
* we always need ->prepare() or/and ->finish() cache sync.
*/
if (q->memory == VB2_MEMORY_DMABUF) {
vb->need_cache_sync_on_finish = 0;
vb->need_cache_sync_on_prepare = 0;
vb->skip_cache_sync_on_finish = 1;
vb->skip_cache_sync_on_prepare = 1;
return;
}
/*
* Cache sync/invalidation flags are set by default in order to
* preserve existing behaviour for old apps/drivers.
*/
vb->need_cache_sync_on_prepare = 1;
vb->need_cache_sync_on_finish = 1;
if (!vb2_queue_allows_cache_hints(q)) {
/*
* Clear buffer cache flags if queue does not support user
@ -379,13 +372,13 @@ static void set_buffer_cache_hints(struct vb2_queue *q,
* TO_DEVICE.
*/
if (q->dma_dir == DMA_TO_DEVICE)
vb->need_cache_sync_on_finish = 0;
vb->skip_cache_sync_on_finish = 1;
if (b->flags & V4L2_BUF_FLAG_NO_CACHE_INVALIDATE)
vb->need_cache_sync_on_finish = 0;
vb->skip_cache_sync_on_finish = 1;
if (b->flags & V4L2_BUF_FLAG_NO_CACHE_CLEAN)
vb->need_cache_sync_on_prepare = 0;
vb->skip_cache_sync_on_prepare = 1;
}
static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *mdev,

12
include/media/videobuf2-core.h
View file

@ -267,10 +267,10 @@ struct vb2_buffer {
* after the 'buf_finish' op is called.
* copied_timestamp: the timestamp of this capture buffer was copied
* from an output buffer.
* need_cache_sync_on_prepare: when set buffer's ->prepare() function
* performs cache sync/invalidation.
* need_cache_sync_on_finish: when set buffer's ->finish() function
* performs cache sync/invalidation.
* skip_cache_sync_on_prepare: when set buffer's ->prepare() function
* skips cache sync/invalidation.
* skip_cache_sync_on_finish: when set buffer's ->finish() function
* skips cache sync/invalidation.
* queued_entry: entry on the queued buffers list, which holds
* all buffers queued from userspace
* done_entry: entry on the list that stores all buffers ready
@ -281,8 +281,8 @@ struct vb2_buffer {
unsigned int synced:1;
unsigned int prepared:1;
unsigned int copied_timestamp:1;
unsigned int need_cache_sync_on_prepare:1;
unsigned int need_cache_sync_on_finish:1;
unsigned int skip_cache_sync_on_prepare:1;
unsigned int skip_cache_sync_on_finish:1;
struct vb2_plane planes[VB2_MAX_PLANES];
struct list_head queued_entry;