From patchwork Tue Jan 16 14:05:22 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans Verkuil X-Patchwork-Id: 13520868 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 550751BDDC for ; Tue, 16 Jan 2024 14:05:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86B15C433F1; Tue, 16 Jan 2024 14:05:24 +0000 (UTC) Message-ID: <5df8141c-c0eb-4f55-b380-94cda08bd5ad@xs4all.nl> Date: Tue, 16 Jan 2024 15:05:22 +0100 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Hans Verkuil Subject: [PATCH] media: vb2: refactor setting flags and caps, fix missing cap To: tfiga@chromium.org, m.szyprowski@samsung.com, mchehab@kernel.org, Benjamin Gaignard Cc: linux-media@vger.kernel.org, kernel@collabora.com Content-Language: en-US, nl Several functions implementing VIDIOC_REQBUFS and _CREATE_BUFS all use almost the same code to fill in the flags and capability fields. Refactor this into a new vb2_set_flags_and_caps() function that replaces the old fill_buf_caps() and validate_memory_flags() functions. This also fixes a bug where vb2_ioctl_create_bufs() would not set the V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS cap and also not fill in the max_num_buffers field. Fixes: d055a76c0065 ("media: core: Report the maximum possible number of buffers for the queue") Signed-off-by: Hans Verkuil Reviewed-by: Benjamin Gaignard Acked-by: Tomasz Figa --- .../media/common/videobuf2/videobuf2-v4l2.c | 55 +++++++++---------- 1 file changed, 26 insertions(+), 29 deletions(-) diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index 54d572c3b515..c575198e8354 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -671,8 +671,20 @@ int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) } EXPORT_SYMBOL(vb2_querybuf); -static void fill_buf_caps(struct vb2_queue *q, u32 *caps) +static void vb2_set_flags_and_caps(struct vb2_queue *q, u32 memory, + u32 *flags, u32 *caps, u32 *max_num_bufs) { + if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP) { + /* + * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only, + * but in order to avoid bugs we zero out all bits. + */ + *flags = 0; + } else { + /* Clear all unknown flags. */ + *flags &= V4L2_MEMORY_FLAG_NON_COHERENT; + } + *caps = V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS; if (q->io_modes & VB2_MMAP) *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP; @@ -686,21 +698,9 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps) *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS; if (q->supports_requests) *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS; -} - -static void validate_memory_flags(struct vb2_queue *q, - int memory, - u32 *flags) -{ - if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP) { - /* - * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only, - * but in order to avoid bugs we zero out all bits. - */ - *flags = 0; - } else { - /* Clear all unknown flags. */ - *flags &= V4L2_MEMORY_FLAG_NON_COHERENT; + if (max_num_bufs) { + *max_num_bufs = q->max_num_buffers; + *caps |= V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS; } } @@ -709,8 +709,8 @@ int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) int ret = vb2_verify_memory_type(q, req->memory, req->type); u32 flags = req->flags; - fill_buf_caps(q, &req->capabilities); - validate_memory_flags(q, req->memory, &flags); + vb2_set_flags_and_caps(q, req->memory, &flags, + &req->capabilities, NULL); req->flags = flags; return ret ? ret : vb2_core_reqbufs(q, req->memory, req->flags, &req->count); @@ -751,11 +751,9 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) int ret = vb2_verify_memory_type(q, create->memory, f->type); unsigned i; - fill_buf_caps(q, &create->capabilities); - validate_memory_flags(q, create->memory, &create->flags); create->index = vb2_get_num_buffers(q); - create->max_num_buffers = q->max_num_buffers; - create->capabilities |= V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS; + vb2_set_flags_and_caps(q, create->memory, &create->flags, + &create->capabilities, &create->max_num_buffers); if (create->count == 0) return ret != -EBUSY ? ret : 0; @@ -1006,8 +1004,8 @@ int vb2_ioctl_reqbufs(struct file *file, void *priv, int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type); u32 flags = p->flags; - fill_buf_caps(vdev->queue, &p->capabilities); - validate_memory_flags(vdev->queue, p->memory, &flags); + vb2_set_flags_and_caps(vdev->queue, p->memory, &flags, + &p->capabilities, NULL); p->flags = flags; if (res) return res; @@ -1026,12 +1024,11 @@ int vb2_ioctl_create_bufs(struct file *file, void *priv, struct v4l2_create_buffers *p) { struct video_device *vdev = video_devdata(file); - int res = vb2_verify_memory_type(vdev->queue, p->memory, - p->format.type); + int res = vb2_verify_memory_type(vdev->queue, p->memory, p->format.type); - p->index = vdev->queue->num_buffers; - fill_buf_caps(vdev->queue, &p->capabilities); - validate_memory_flags(vdev->queue, p->memory, &p->flags); + p->index = vb2_get_num_buffers(vdev->queue); + vb2_set_flags_and_caps(vdev->queue, p->memory, &p->flags, + &p->capabilities, &p->max_num_buffers); /* * If count == 0, then just check if memory and type are valid. * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0.