Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755224AbdLUSwX (ORCPT ); Thu, 21 Dec 2017 13:52:23 -0500 Received: from osg.samsung.com ([64.30.133.232]:36787 "EHLO osg.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752884AbdLUSwW (ORCPT ); Thu, 21 Dec 2017 13:52:22 -0500 Date: Thu, 21 Dec 2017 16:52:15 -0200 From: Mauro Carvalho Chehab To: Gustavo Padovan Cc: linux-media@vger.kernel.org, Hans Verkuil , Shuah Khan , Pawel Osciak , Alexandre Courbot , Sakari Ailus , Brian Starkey , Thierry Escande , linux-kernel@vger.kernel.org, Gustavo Padovan Subject: Re: [PATCH v6 3/6] [media] vb2: add explicit fence user API Message-ID: <20171221165215.46dc86a5@vento.lan> In-Reply-To: <20171211182741.29712-4-gustavo@padovan.org> References: <20171211182741.29712-1-gustavo@padovan.org> <20171211182741.29712-4-gustavo@padovan.org> Organization: Samsung X-Mailer: Claws Mail 3.15.1-dirty (GTK+ 2.24.31; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5067 Lines: 139 Em Mon, 11 Dec 2017 16:27:38 -0200 Gustavo Padovan escreveu: > From: Gustavo Padovan > > Turn the reserved2 field into fence_fd that we will use to send > an in-fence to the kernel and return an out-fence from the kernel to > userspace. > > Two new flags were added, V4L2_BUF_FLAG_IN_FENCE, that should be used > when sending a fence to the kernel to be waited on, and > V4L2_BUF_FLAG_OUT_FENCE, to ask the kernel to give back an out-fence. > > v4: > - make it a union with reserved2 and fence_fd (Hans Verkuil) > > v3: > - make the out_fence refer to the current buffer (Hans Verkuil) > > v2: add documentation > > Signed-off-by: Gustavo Padovan > --- > Documentation/media/uapi/v4l/buffer.rst | 15 +++++++++++++++ > drivers/media/usb/cpia2/cpia2_v4l.c | 2 +- > drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 4 ++-- > drivers/media/v4l2-core/videobuf2-v4l2.c | 2 +- > include/uapi/linux/videodev2.h | 7 ++++++- > 5 files changed, 25 insertions(+), 5 deletions(-) > > diff --git a/Documentation/media/uapi/v4l/buffer.rst b/Documentation/media/uapi/v4l/buffer.rst > index ae6ee73f151c..eeefbd2547e7 100644 > --- a/Documentation/media/uapi/v4l/buffer.rst > +++ b/Documentation/media/uapi/v4l/buffer.rst > @@ -648,6 +648,21 @@ Buffer Flags > - Start Of Exposure. The buffer timestamp has been taken when the > exposure of the frame has begun. This is only valid for the > ``V4L2_BUF_TYPE_VIDEO_CAPTURE`` buffer type. > + * .. _`V4L2-BUF-FLAG-IN-FENCE`: > + > + - ``V4L2_BUF_FLAG_IN_FENCE`` > + - 0x00200000 > + - Ask V4L2 to wait on fence passed in ``fence_fd`` field. The buffer > + won't be queued to the driver until the fence signals. > + > + * .. _`V4L2-BUF-FLAG-OUT-FENCE`: > + > + - ``V4L2_BUF_FLAG_OUT_FENCE`` > + - 0x00400000 > + - Request a fence to be attached to the buffer. The ``fence_fd`` > + field on > + :ref:`VIDIOC_QBUF` is used as a return argument to send the out-fence > + fd to userspace. > > > > diff --git a/drivers/media/usb/cpia2/cpia2_v4l.c b/drivers/media/usb/cpia2/cpia2_v4l.c > index a1c59f19cf2d..7d7459fa2077 100644 > --- a/drivers/media/usb/cpia2/cpia2_v4l.c > +++ b/drivers/media/usb/cpia2/cpia2_v4l.c > @@ -948,7 +948,7 @@ static int cpia2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf) > buf->sequence = cam->buffers[buf->index].seq; > buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer; > buf->length = cam->frame_size; > - buf->reserved2 = 0; > + buf->fence_fd = -1; > buf->reserved = 0; > memset(&buf->timecode, 0, sizeof(buf->timecode)); > > diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c > index 821f2aa299ae..3a31d318df2a 100644 > --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c > +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c > @@ -370,7 +370,7 @@ struct v4l2_buffer32 { > __s32 fd; > } m; > __u32 length; > - __u32 reserved2; > + __s32 fence_fd; > __u32 reserved; > }; > > @@ -533,7 +533,7 @@ static int put_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user > put_user(kp->timestamp.tv_usec, &up->timestamp.tv_usec) || > copy_to_user(&up->timecode, &kp->timecode, sizeof(struct v4l2_timecode)) || > put_user(kp->sequence, &up->sequence) || > - put_user(kp->reserved2, &up->reserved2) || > + put_user(kp->fence_fd, &up->fence_fd) || > put_user(kp->reserved, &up->reserved) || > put_user(kp->length, &up->length)) > return -EFAULT; > diff --git a/drivers/media/v4l2-core/videobuf2-v4l2.c b/drivers/media/v4l2-core/videobuf2-v4l2.c > index 4075314a6989..4a5244ee2c58 100644 > --- a/drivers/media/v4l2-core/videobuf2-v4l2.c > +++ b/drivers/media/v4l2-core/videobuf2-v4l2.c > @@ -203,7 +203,7 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb) > b->timestamp = ns_to_timeval(vb->timestamp); > b->timecode = vbuf->timecode; > b->sequence = vbuf->sequence; > - b->reserved2 = 0; > + b->fence_fd = -1; The patch itself looks ok. I'm just in doubt here, but it is probably ok to change its default to -1. > b->reserved = 0; > > if (q->is_multiplanar) { > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h > index a8ea632c14f0..17e163b5036d 100644 > --- a/include/uapi/linux/videodev2.h > +++ b/include/uapi/linux/videodev2.h > @@ -926,7 +926,10 @@ struct v4l2_buffer { > __s32 fd; > } m; > __u32 length; > - __u32 reserved2; > + union { > + __s32 fence_fd; > + __u32 reserved2; > + }; > __u32 reserved; > }; > > @@ -963,6 +966,8 @@ struct v4l2_buffer { > #define V4L2_BUF_FLAG_TSTAMP_SRC_SOE 0x00010000 > /* mem2mem encoder/decoder */ > #define V4L2_BUF_FLAG_LAST 0x00100000 > +#define V4L2_BUF_FLAG_IN_FENCE 0x00200000 > +#define V4L2_BUF_FLAG_OUT_FENCE 0x00400000 > > /** > * struct v4l2_exportbuffer - export of video buffer as DMABUF file descriptor -- Thanks, Mauro