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From: Sergey Senozhatsky <senozhatsky@chromium.org>
To: 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>
Cc: 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 <senozhatsky@chromium.org>
Subject: [RFC][PATCHv2 09/12] videobuf2: let user-space know if driver supports cache hints
Date: Tue,  4 Feb 2020 11:56:38 +0900	[thread overview]
Message-ID: <20200204025641.218376-10-senozhatsky@chromium.org> (raw)
In-Reply-To: <20200204025641.218376-1-senozhatsky@chromium.org>

Add V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS to fill_buf_caps(), which
is set when queue supports user-space cache management hints.

Change-Id: Ieac93f3726c61fd3b88e02c36980c1f3c7a82ecc
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
---
 Documentation/media/uapi/v4l/vidioc-reqbufs.rst | 7 +++++++
 drivers/media/common/videobuf2/videobuf2-v4l2.c | 2 ++
 include/uapi/linux/videodev2.h                  | 1 +
 3 files changed, 10 insertions(+)

diff --git a/Documentation/media/uapi/v4l/vidioc-reqbufs.rst b/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
index 9741dac0d5b3..80603f57eb8a 100644
--- a/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
+++ b/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
@@ -165,6 +165,13 @@ aborting or finishing any DMA in progress, an implicit
       - Only valid for stateless decoders. If set, then userspace can set the
         ``V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF`` flag to hold off on returning the
 	capture buffer until the OUTPUT timestamp changes.
+    * - ``V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS``
+      - 0x00000040
+      - Set when the queue/buffer support memory consistency and cache
+        management hints. See :ref:`V4L2_FLAG_MEMORY_NON_CONSISTENT`,
+        :ref:`V4L2_BUF_FLAG_NO_CACHE_INVALIDATE` and
+        :ref:`V4L2_BUF_FLAG_NO_CACHE_CLEAN`.
+
 
 Return Value
 ============
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index eb5d1306cb03..22ae0ff64684 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -698,6 +698,8 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps)
 		*caps |= V4L2_BUF_CAP_SUPPORTS_DMABUF;
 	if (q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF)
 		*caps |= V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF;
+	if (q->allow_cache_hints)
+		*caps |= V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS;
 #ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
 	if (q->supports_requests)
 		*caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS;
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 169a8cf345ed..12b1bd220347 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -951,6 +951,7 @@ struct v4l2_requestbuffers {
 #define V4L2_BUF_CAP_SUPPORTS_REQUESTS			(1 << 3)
 #define V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS		(1 << 4)
 #define V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF	(1 << 5)
+#define V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS		(1 << 6)
 
 /**
  * struct v4l2_plane - plane info for multi-planar buffers
-- 
2.25.0.341.g760bfbb309-goog


  parent reply	other threads:[~2020-02-04  2:57 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-04  2:56 [RFC][PATCHv2 00/12] Implement V4L2_BUF_FLAG_NO_CACHE_* flags Sergey Senozhatsky
2020-02-04  2:56 ` [RFC][PATCHv2 01/12] videobuf2: add cache management members Sergey Senozhatsky
2020-02-19  8:05   ` Hans Verkuil
2020-02-19  8:16     ` Sergey Senozhatsky
2020-02-19  8:27       ` Hans Verkuil
2020-02-04  2:56 ` [RFC][PATCHv2 02/12] videobuf2: handle V4L2 buffer cache flags Sergey Senozhatsky
2020-02-05  8:13   ` Sergey Senozhatsky
2020-02-19  8:07   ` Hans Verkuil
2020-02-19  8:13     ` Sergey Senozhatsky
2020-02-19  8:25       ` Hans Verkuil
2020-02-19  8:46   ` Hans Verkuil
2020-02-04  2:56 ` [RFC][PATCHv2 03/12] videobuf2: add V4L2_FLAG_MEMORY_NON_CONSISTENT flag Sergey Senozhatsky
2020-02-13  7:08   ` Tomasz Figa
2020-02-19  8:19   ` Hans Verkuil
2020-02-19  8:56   ` Hans Verkuil
2020-02-25  7:45     ` Sergey Senozhatsky
2020-02-04  2:56 ` [RFC][PATCHv2 04/12] videobuf2: add queue memory consistency parameter Sergey Senozhatsky
2020-02-04  2:56 ` [RFC][PATCHv2 05/12] videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT flag Sergey Senozhatsky
2020-02-19  8:25   ` Hans Verkuil
2020-02-19  8:59     ` Sergey Senozhatsky
2020-02-19  9:04       ` Hans Verkuil
2020-02-19  8:48   ` Hans Verkuil
2020-02-19  9:05     ` Sergey Senozhatsky
2020-02-19  9:11       ` Hans Verkuil
2020-02-04  2:56 ` [RFC][PATCHv2 06/12] videobuf2: factor out planes prepare/finish functions Sergey Senozhatsky
2020-02-04  2:56 ` [RFC][PATCHv2 07/12] videobuf2: do not sync caches when we are allowed not to Sergey Senozhatsky
2020-02-04  2:56 ` [RFC][PATCHv2 08/12] videobuf2: check ->synced flag in prepare() and finish() Sergey Senozhatsky
2020-02-04  2:56 ` Sergey Senozhatsky [this message]
2020-02-19  8:33   ` [RFC][PATCHv2 09/12] videobuf2: let user-space know if driver supports cache hints Hans Verkuil
2020-02-19  8:45     ` Sergey Senozhatsky
2020-02-19  8:56       ` Hans Verkuil
2020-02-04  2:56 ` [RFC][PATCHv2 10/12] videobuf2: add begin/end cpu_access callbacks to dma-contig Sergey Senozhatsky
2020-02-04  2:56 ` [RFC][PATCHv2 11/12] videobuf2: add begin/end cpu_access callbacks to dma-sg Sergey Senozhatsky
2020-02-19  8:35   ` Hans Verkuil
2020-02-19  8:42     ` Sergey Senozhatsky
2020-02-04  2:56 ` [RFC][PATCHv2 12/12] videobuf2: don't test db_attach in dma-contig prepare and finish Sergey Senozhatsky
2020-02-19  8:53 ` [RFC][PATCHv2 00/12] Implement V4L2_BUF_FLAG_NO_CACHE_* flags Hans Verkuil
2020-02-26 11:20   ` Sergey Senozhatsky

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