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Date: Mon, 17 Jun 2024 07:11:54 +0000
From: Yunfei Dong (董云飞) <Yunfei.Dong@...iatek.com>
To: "andrzej.p@...labora.com" <andrzej.p@...labora.com>, "tfiga@...omium.org"
<tfiga@...omium.org>, "nhebert@...omium.org" <nhebert@...omium.org>,
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"mchehab@...nel.org" <mchehab@...nel.org>, "m.szyprowski@...sung.com"
<m.szyprowski@...sung.com>, "jkardatzke@...gle.com" <jkardatzke@...gle.com>,
"benjamin.gaignard@...labora.com" <benjamin.gaignard@...labora.com>,
"hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>,
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<angelogioacchino.delregno@...labora.com>, "nfraprado@...labora.com"
<nfraprado@...labora.com>
CC: "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
"frkoenig@...omium.org" <frkoenig@...omium.org>, "stevecho@...omium.org"
<stevecho@...omium.org>, "wenst@...omium.org" <wenst@...omium.org>,
"jstultz@...gle.com" <jstultz@...gle.com>, "christian.koenig@....com"
<christian.koenig@....com>, "linux-media@...r.kernel.org"
<linux-media@...r.kernel.org>, "daniel@...ll.ch" <daniel@...ll.ch>,
Yong Wu (吴勇) <Yong.Wu@...iatek.com>,
"Brian.Starkey@....com" <Brian.Starkey@....com>, "hsinyi@...omium.org"
<hsinyi@...omium.org>, "tjmercier@...gle.com" <tjmercier@...gle.com>,
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<linux-arm-kernel@...ts.infradead.org>, "dri-devel@...ts.freedesktop.org"
<dri-devel@...ts.freedesktop.org>, "matthias.bgg@...il.com"
<matthias.bgg@...il.com>, Project_Global_Chrome_Upstream_Group
<Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v6,02/24] v4l2: handle restricted memory flags in queue
setup
Hi Andrzej,
Thanks for your help to review this patch.
Your suggestion is very reasonable, I will change it later.
Best Regards,
Yunfei Dong
On Wed, 2024-05-22 at 14:20 +0200, Andrzej Pietrasiewicz wrote:
> Hi Yunfei & Jeffrey,
>
> W dniu 16.05.2024 o 14:20, Yunfei Dong pisze:
> > From: Jeffrey Kardatzke <jkardatzke@...gle.com>
> >
> > Validates the restricted memory flags when setting up a queue and
> > ensures the queue has the proper capability.
> >
> > Signed-off-by: Jeffrey Kardatzke <jkardatzke@...gle.com>
> > Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
> > ---
> > .../media/common/videobuf2/videobuf2-core.c | 21
> > +++++++++++++++++++
> > .../media/common/videobuf2/videobuf2-v4l2.c | 4 +++-
> > 2 files changed, 24 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/common/videobuf2/videobuf2-core.c
> > b/drivers/media/common/videobuf2/videobuf2-core.c
> > index 358f1fe42975..fe4c0594ab81 100644
> > --- a/drivers/media/common/videobuf2/videobuf2-core.c
> > +++ b/drivers/media/common/videobuf2/videobuf2-core.c
> > @@ -831,6 +831,15 @@ static bool verify_coherency_flags(struct
> > vb2_queue *q, bool non_coherent_mem)
> > return true;
> > }
> >
> > +static bool verify_restricted_mem_flags(struct vb2_queue *q, bool
> > restricted_mem)
> > +{
> > + if (restricted_mem != q->restricted_mem) {
> > + dprintk(q, 1, "restricted memory model mismatch\n");
> > + return false;
> > + }
> > + return true;
> > +}
> > +
> > static int vb2_core_allocated_buffers_storage(struct vb2_queue
> > *q)
> > {
> > if (!q->bufs)
> > @@ -864,6 +873,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum
> > vb2_memory memory,
> > unsigned int q_num_bufs = vb2_get_num_buffers(q);
> > unsigned plane_sizes[VB2_MAX_PLANES] = { };
> > bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT;
> > + bool restricted_mem = flags & V4L2_MEMORY_FLAG_RESTRICTED;
> > unsigned int i, first_index;
> > int ret = 0;
> >
> > @@ -907,6 +917,9 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum
> > vb2_memory memory,
> > return 0;
> > }
> >
> > + if (restricted_mem && (!q->allow_restricted_mem || memory !=
> > VB2_MEMORY_DMABUF))
> > + return -EINVAL;
> > +
> > /*
> > * Make sure the requested values and current defaults are
> > sane.
> > */
> > @@ -924,6 +937,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum
> > vb2_memory memory,
> > if (ret)
> > return ret;
> > set_queue_coherency(q, non_coherent_mem);
> > + q->restricted_mem = restricted_mem;
> >
> > /*
> > * Ask the driver how many buffers and planes per buffer it
> > requires.
> > @@ -1032,6 +1046,7 @@ int vb2_core_create_bufs(struct vb2_queue *q,
> > enum vb2_memory memory,
> > unsigned plane_sizes[VB2_MAX_PLANES] = { };
> > bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT;
> > unsigned int q_num_bufs = vb2_get_num_buffers(q);
> > + bool restricted_mem = flags & V4L2_MEMORY_FLAG_RESTRICTED;
> > bool no_previous_buffers = !q_num_bufs;
> > int ret = 0;
> >
> > @@ -1040,6 +1055,9 @@ int vb2_core_create_bufs(struct vb2_queue *q,
> > enum vb2_memory memory,
> > return -ENOBUFS;
> > }
> >
> > + if (restricted_mem && (!q->allow_restricted_mem || memory !=
> > VB2_MEMORY_DMABUF))
> > + return -EINVAL;
> > +
>
> This condition is repeated in another place. If it is ever to be
> changed, the person changing it must remember to look at both
> places. Maybe:
>
> static inline int restricted_mem_mismatch(bool restricted_mem,
> struct vb2_queue *q, enum vb2_memory
> memory)
> {
> return restricted_mem &&
> (!q->allow_restricted_mem || memory !=
> VB2_MEMORY_DMABUF) ?
> -1 : 0;
> }
>
> (you probably want to clean up line breaks)
>
> and:
>
> if (restricted_mem_mismatch(restricted_mem, q, memory))
> return -EINVAL;
>
> Regards,
>
> Andrzej
>
> > if (no_previous_buffers) {
> > if (q->waiting_in_dqbuf && *count) {
> > dprintk(q, 1, "another dup()ped fd is waiting
> > for a buffer\n");
> > @@ -1058,6 +1076,7 @@ int vb2_core_create_bufs(struct vb2_queue *q,
> > enum vb2_memory memory,
> > return ret;
> > q->waiting_for_buffers = !q->is_output;
> > set_queue_coherency(q, non_coherent_mem);
> > + q->restricted_mem = restricted_mem;
> > } else {
> > if (q->memory != memory) {
> > dprintk(q, 1, "memory model mismatch\n");
> > @@ -1065,6 +1084,8 @@ int vb2_core_create_bufs(struct vb2_queue *q,
> > enum vb2_memory memory,
> > }
> > if (!verify_coherency_flags(q, non_coherent_mem))
> > return -EINVAL;
> > + if (!verify_restricted_mem_flags(q, restricted_mem))
> > + return -EINVAL;
> > }
> >
> > num_buffers = min(*count, q->max_num_buffers - q_num_bufs);
> > diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c
> > b/drivers/media/common/videobuf2/videobuf2-v4l2.c
> > index 293f3d5f1c4e..9ee24e537e0c 100644
> > --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
> > +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
> > @@ -682,7 +682,7 @@ static void vb2_set_flags_and_caps(struct
> > vb2_queue *q, u32 memory,
> > *flags = 0;
> > } else {
> > /* Clear all unknown flags. */
> > - *flags &= V4L2_MEMORY_FLAG_NON_COHERENT;
> > + *flags &= V4L2_MEMORY_FLAG_NON_COHERENT |
> > V4L2_MEMORY_FLAG_RESTRICTED;
> > }
> >
> > *caps |= V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS;
> > @@ -698,6 +698,8 @@ static void vb2_set_flags_and_caps(struct
> > vb2_queue *q, u32 memory,
> > *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS;
> > if (q->supports_requests)
> > *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS;
> > + if (q->allow_restricted_mem && q->io_modes & VB2_DMABUF)
> > + *caps |= V4L2_BUF_CAP_SUPPORTS_RESTRICTED_MEM;
> > if (max_num_bufs) {
> > *max_num_bufs = q->max_num_buffers;
> > *caps |= V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS;
>
>
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