From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Hans Verkuil <hans.verkuil@cisco.com>,
Tomasz Figa <tfiga@chromium.org>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Kyungmin Park <kyungmin.park@samsung.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Sakari Ailus <sakari.ailus@iki.fi>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Pawel Osciak <posciak@chromium.org>,
linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Sergey Senozhatsky <senozhatsky@chromium.org>
Subject: Re: [PATCHv4 01/11] videobuf2: add cache management members
Date: Mon, 9 Mar 2020 12:44:11 +0900 [thread overview]
Message-ID: <20200309034411.GA856@jagdpanzerIV.localdomain> (raw)
In-Reply-To: <20200309032707.GA9460@google.com>
On (20/03/09 12:27), Sergey Senozhatsky wrote:
> On (20/03/07 12:47), Hans Verkuil wrote:
> >
> > Create those tests in v4l2-compliance: that's where they belong.
> >
> > You need these tests:
> >
> > For non-MMAP modes:
> >
> > 1) test that V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS is never set.
> >
> > If V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS is not set, then:
> >
> > 1) attempting to use V4L2_FLAG_MEMORY_NON_CONSISTENT will clear the flag
> > upon return (test with both reqbufs and create_bufs).
> > 2) attempting to use V4L2_BUF_FLAG_NO_CACHE_INVALIDATE or V4L2_BUF_FLAG_NO_CACHE_CLEAN
> > will clear those flags upon return (do we actually do that in the patch series?).
>
> NO_CACHE_INVALIDATE/NO_CACHE_CLEAN are cleared in vb2_fill_vb2_v4l2_buffer()
> [as was suggested], then the struct is copied back to user. But I think it
> would be better to clear those flags when we clear
> V4L2_FLAG_MEMORY_NON_CONSISTENT. We have 4 places which do something
> like
> "if !vb2_queue_allows_cache_hints(q) then clear flags bit".
No. I'll just move NO_CACHE_INVALIDATE/NO_CACHE_CLEAN handling to
set_buffer_cache_hints(). This is where we take care of q->memory
and q->allow_cache_hints, this is where we set/clear the
->need_cache_sync flags, this is where we also can clear v4l2_buffer
->flags. Seems like a better place than vb2_fill_vb2_v4l2_buffer().
---
.../media/common/videobuf2/videobuf2-v4l2.c | 19 +++++++++----------
1 file changed, 9 insertions(+), 10 deletions(-)
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index b4b379f3bf98..0a6bd4a1f58e 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -199,15 +199,6 @@ static int vb2_fill_vb2_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b
vbuf->request_fd = -1;
vbuf->is_held = false;
- /*
- * Clear buffer cache flags if queue does not support user space hints.
- * That's to indicate to userspace that these flags won't work.
- */
- if (!vb2_queue_allows_cache_hints(q)) {
- b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_INVALIDATE;
- b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_CLEAN;
- }
-
if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
switch (b->memory) {
case VB2_MEMORY_USERPTR:
@@ -368,8 +359,16 @@ static void set_buffer_cache_hints(struct vb2_queue *q,
vb->need_cache_sync_on_prepare = 1;
vb->need_cache_sync_on_finish = 1;
- if (!vb2_queue_allows_cache_hints(q))
+ if (!vb2_queue_allows_cache_hints(q)) {
+ /*
+ * Clear buffer cache flags if queue does not support user
+ * space hints. That's to indicate to userspace that these
+ * flags won't work.
+ */
+ b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_INVALIDATE;
+ b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_CLEAN;
return;
+ }
/*
* ->finish() cache sync can be avoided when queue direction is
--
2.25.1
next prev parent reply other threads:[~2020-03-09 3:44 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-02 4:12 [PATCHv4 00/11] Implement V4L2_BUF_FLAG_NO_CACHE_* flags Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 01/11] videobuf2: add cache management members Sergey Senozhatsky
2020-03-06 13:57 ` Hans Verkuil
2020-03-07 5:22 ` Sergey Senozhatsky
2020-03-07 9:46 ` Sergey Senozhatsky
2020-03-07 10:10 ` Hans Verkuil
2020-03-07 11:28 ` Sergey Senozhatsky
2020-03-07 11:47 ` Hans Verkuil
2020-03-09 3:27 ` Sergey Senozhatsky
2020-03-09 3:44 ` Sergey Senozhatsky [this message]
2020-03-09 7:21 ` Hans Verkuil
2020-03-09 7:25 ` Sergey Senozhatsky
2020-03-09 7:28 ` Hans Verkuil
2020-03-09 7:39 ` Sergey Senozhatsky
2020-03-09 8:58 ` Tomasz Figa
2020-03-09 9:08 ` Sergey Senozhatsky
2020-03-09 9:17 ` Tomasz Figa
2020-03-09 9:29 ` Sergey Senozhatsky
2020-03-09 4:03 ` Sergey Senozhatsky
2020-03-09 7:17 ` Hans Verkuil
2020-03-02 4:12 ` [PATCHv4 02/11] videobuf2: handle V4L2 buffer cache flags Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 03/11] videobuf2: add V4L2_FLAG_MEMORY_NON_CONSISTENT flag Sergey Senozhatsky
2020-03-06 13:58 ` Hans Verkuil
2020-03-07 8:09 ` Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 04/11] videobuf2: add queue memory consistency parameter Sergey Senozhatsky
2020-03-06 14:04 ` Hans Verkuil
2020-03-07 7:50 ` Sergey Senozhatsky
2020-03-07 10:03 ` Hans Verkuil
2020-03-20 13:46 ` Dafna Hirschfeld
2020-03-24 2:39 ` Sergey Senozhatsky
2020-03-24 10:17 ` Ezequiel Garcia
2020-03-25 2:32 ` Sergey Senozhatsky
2020-03-27 11:27 ` Tomasz Figa
2020-03-02 4:12 ` [PATCHv4 05/11] videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT flag Sergey Senozhatsky
2020-03-06 15:30 ` Hans Verkuil
2020-03-07 7:51 ` Sergey Senozhatsky
2020-03-07 9:38 ` Sergey Senozhatsky
2020-03-07 10:05 ` Hans Verkuil
2020-03-02 4:12 ` [PATCHv4 06/11] videobuf2: factor out planes prepare/finish functions Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 07/11] videobuf2: do not sync caches when we are allowed not to Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 08/11] videobuf2: check ->synced flag in prepare() and finish() Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 09/11] videobuf2: add begin/end cpu_access callbacks to dma-contig Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 10/11] videobuf2: add begin/end cpu_access callbacks to dma-sg Sergey Senozhatsky
2020-03-06 14:04 ` Hans Verkuil
2020-03-07 5:26 ` Sergey Senozhatsky
2020-03-07 9:32 ` Hans Verkuil
2020-03-07 9:39 ` Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 11/11] videobuf2: don't test db_attach in dma-contig prepare and finish Sergey Senozhatsky
2020-03-06 14:18 ` [PATCHv4 00/11] Implement V4L2_BUF_FLAG_NO_CACHE_* flags Hans Verkuil
2020-03-07 8:08 ` Sergey Senozhatsky
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