[PATCH v5 02/10] media: videobuf2: Access vb2_queue bufs array through helper functions
Benjamin Gaignard
benjamin.gaignard at collabora.com
Fri Sep 1 05:29:48 PDT 2023
Le 30/08/2023 à 15:23, Hans Verkuil a écrit :
> On 24/08/2023 11:21, Benjamin Gaignard wrote:
>> The first step before changing how vb2 buffers are stored into queue
>> is to avoid direct access to bufs arrays.
>>
>> This patch adds 2 helpers functions to add and remove vb2 buffers
>> from a queue. With these 2 and vb2_get_buffer(), bufs field of
>> struct vb2_queue becomes like a private member of the structure.
>>
>> After each call to vb2_get_buffer() we need to be sure that we get
>> a valid pointer so check the return value of all of them.
>>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard at collabora.com>
>>
>> # Conflicts:
>> # drivers/media/common/videobuf2/videobuf2-core.c
>> ---
>> .../media/common/videobuf2/videobuf2-core.c | 203 ++++++++++++++----
>> .../media/common/videobuf2/videobuf2-v4l2.c | 28 ++-
>> drivers/media/platform/amphion/vpu_dbg.c | 22 +-
>> .../platform/mediatek/jpeg/mtk_jpeg_core.c | 6 +-
>> .../vcodec/decoder/vdec/vdec_vp9_req_lat_if.c | 2 +-
>> drivers/media/platform/st/sti/hva/hva-v4l2.c | 4 +
>> drivers/media/test-drivers/visl/visl-dec.c | 28 ++-
>> .../staging/media/atomisp/pci/atomisp_ioctl.c | 2 +-
>> 8 files changed, 230 insertions(+), 65 deletions(-)
>>
>> diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
>> index e06905533ef4..8aa13591b782 100644
>> --- a/drivers/media/common/videobuf2/videobuf2-core.c
>> +++ b/drivers/media/common/videobuf2/videobuf2-core.c
>> @@ -403,6 +403,37 @@ static void init_buffer_cache_hints(struct vb2_queue *q, struct vb2_buffer *vb)
>> vb->skip_cache_sync_on_finish = 1;
>> }
>>
>> +/**
>> + * vb2_queue_add_buffer() - add a buffer to a queue
>> + * @q: pointer to &struct vb2_queue with videobuf2 queue.
>> + * @vb: pointer to &struct vb2_buffer to be added to the queue.
>> + * @index: index where add vb2_buffer in the queue
>> + */
>> +static bool vb2_queue_add_buffer(struct vb2_queue *q, struct vb2_buffer *vb, int index)
>> +{
>> + if (index < VB2_MAX_FRAME && !q->bufs[index]) {
>> + q->bufs[index] = vb;
>> + vb->index = index;
>> + vb->vb2_queue = q;
>> + return true;
>> + }
>> +
>> + return false;
>> +}
>> +
>> +/**
>> + * vb2_queue_remove_buffer() - remove a buffer from a queue
>> + * @q: pointer to &struct vb2_queue with videobuf2 queue.
>> + * @vb: pointer to &struct vb2_buffer to be removed from the queue.
>> + */
>> +static void vb2_queue_remove_buffer(struct vb2_queue *q, struct vb2_buffer *vb)
>> +{
>> + if (vb->index < VB2_MAX_FRAME) {
>> + q->bufs[vb->index] = NULL;
>> + vb->vb2_queue = NULL;
>> + }
>> +}
>> +
>> /*
>> * __vb2_queue_alloc() - allocate vb2 buffer structures and (for MMAP type)
>> * video buffer memory for all buffers/planes on the queue and initializes the
>> @@ -431,9 +462,7 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
>> }
>>
>> vb->state = VB2_BUF_STATE_DEQUEUED;
>> - vb->vb2_queue = q;
>> vb->num_planes = num_planes;
>> - vb->index = q->num_buffers + buffer;
>> vb->type = q->type;
>> vb->memory = memory;
>> init_buffer_cache_hints(q, vb);
>> @@ -443,7 +472,11 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
>> }
>> call_void_bufop(q, init_buffer, vb);
>>
>> - q->bufs[vb->index] = vb;
>> + if (!vb2_queue_add_buffer(q, vb, q->num_buffers + buffer)) {
>> + dprintk(q, 1, "failed adding buffer %d to queue\n", buffer);
>> + kfree(vb);
>> + break;
>> + }
>>
>> /* Allocate video buffer memory for the MMAP type */
>> if (memory == VB2_MEMORY_MMAP) {
>> @@ -451,7 +484,7 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
>> if (ret) {
>> dprintk(q, 1, "failed allocating memory for buffer %d\n",
>> buffer);
>> - q->bufs[vb->index] = NULL;
>> + vb2_queue_remove_buffer(q, vb);
>> kfree(vb);
>> break;
>> }
>> @@ -466,7 +499,7 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
>> dprintk(q, 1, "buffer %d %p initialization failed\n",
>> buffer, vb);
>> __vb2_buf_mem_free(vb);
>> - q->bufs[vb->index] = NULL;
>> + vb2_queue_remove_buffer(q, vb);
>> kfree(vb);
>> break;
>> }
>> @@ -489,7 +522,7 @@ static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers)
>>
>> for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
>> ++buffer) {
>> - vb = q->bufs[buffer];
>> + vb = vb2_get_buffer(q, buffer);
>> if (!vb)
>> continue;
>>
>> @@ -517,7 +550,7 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
>> /* Call driver-provided cleanup function for each buffer, if provided */
>> for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
>> ++buffer) {
>> - struct vb2_buffer *vb = q->bufs[buffer];
>> + struct vb2_buffer *vb = vb2_get_buffer(q, buffer);
>>
>> if (vb && vb->planes[0].mem_priv)
>> call_void_vb_qop(vb, buf_cleanup, vb);
>> @@ -557,15 +590,20 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
>> q->cnt_unprepare_streaming = 0;
>> }
>> for (buffer = 0; buffer < q->num_buffers; ++buffer) {
>> - struct vb2_buffer *vb = q->bufs[buffer];
>> - bool unbalanced = vb->cnt_mem_alloc != vb->cnt_mem_put ||
>> - vb->cnt_mem_prepare != vb->cnt_mem_finish ||
>> - vb->cnt_mem_get_userptr != vb->cnt_mem_put_userptr ||
>> - vb->cnt_mem_attach_dmabuf != vb->cnt_mem_detach_dmabuf ||
>> - vb->cnt_mem_map_dmabuf != vb->cnt_mem_unmap_dmabuf ||
>> - vb->cnt_buf_queue != vb->cnt_buf_done ||
>> - vb->cnt_buf_prepare != vb->cnt_buf_finish ||
>> - vb->cnt_buf_init != vb->cnt_buf_cleanup;
>> + struct vb2_buffer *vb = vb2_get_buffer(q, buffer);
>> + bool unbalanced;
>> +
>> + if (!vb)
>> + continue;
>> +
>> + unbalanced = vb->cnt_mem_alloc != vb->cnt_mem_put ||
>> + vb->cnt_mem_prepare != vb->cnt_mem_finish ||
>> + vb->cnt_mem_get_userptr != vb->cnt_mem_put_userptr ||
>> + vb->cnt_mem_attach_dmabuf != vb->cnt_mem_detach_dmabuf ||
>> + vb->cnt_mem_map_dmabuf != vb->cnt_mem_unmap_dmabuf ||
>> + vb->cnt_buf_queue != vb->cnt_buf_done ||
>> + vb->cnt_buf_prepare != vb->cnt_buf_finish ||
>> + vb->cnt_buf_init != vb->cnt_buf_cleanup;
>>
>> if (unbalanced || debug) {
> I think we should drop the '|| debug' part. It is already annoying today to see these
> messages when the debug parameter is > 0, and now the number of buffers is still
> fairly small. But if we allow a lot more buffers, then this will really spam the
> kernel log.
>
> I think this should be dropped, and we only report unbalanced buffers.
>
> And another optimization is to only report the unbalanced counters. Right now
> it reports all counters, but it is again too much spamming of the kernel log.
>
> I think this change can be done as a separate patch before this patch.
> That way it can be picked up separately from the other changes in this series.
>
>> pr_info(" counters for queue %p, buffer %d:%s\n",
>> @@ -597,8 +635,13 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
>> /* Free vb2 buffers */
>> for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
>> ++buffer) {
>> - kfree(q->bufs[buffer]);
>> - q->bufs[buffer] = NULL;
>> + struct vb2_buffer *vb = vb2_get_buffer(q, buffer);
>> +
>> + if (!vb)
>> + continue;
>> +
>> + vb2_queue_remove_buffer(q, vb);
>> + kfree(vb);
>> }
>>
>> q->num_buffers -= buffers;
>> @@ -634,7 +677,12 @@ static bool __buffers_in_use(struct vb2_queue *q)
>> {
>> unsigned int buffer;
>> for (buffer = 0; buffer < q->num_buffers; ++buffer) {
>> - if (vb2_buffer_in_use(q, q->bufs[buffer]))
>> + struct vb2_buffer *vb = vb2_get_buffer(q, buffer);
>> +
>> + if (!vb)
>> + continue;
>> +
>> + if (vb2_buffer_in_use(q, vb))
>> return true;
>> }
>> return false;
>> @@ -642,7 +690,10 @@ static bool __buffers_in_use(struct vb2_queue *q)
>>
>> void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb)
>> {
>> - call_void_bufop(q, fill_user_buffer, q->bufs[index], pb);
>> + struct vb2_buffer *vb = vb2_get_buffer(q, index);
>> +
>> + if (vb)
>> + call_void_bufop(q, fill_user_buffer, vb, pb);
> I think that rather than passing the index (that then has to be verified)
> it is better to pass the vb2_buffer pointer directly and leave it up to
> the caller to do the index verification.
That will be be in v6
>
> Another option is to drop this function altogether and let the called
> call the fill_user_buffer function. Either works for me.
>
>> }
>> EXPORT_SYMBOL_GPL(vb2_core_querybuf);
>>
>> @@ -1553,7 +1604,13 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb)
> Here too it is better to pass the vb2_buffer pointer instead of an index.
>
> This function assumes that the index is valid, so the called actually does the
> validation. Passing the vb pointer instead of the index makes more sense
> in this new situation.
>
> This is also true for two other core functions: vb2_core_qbuf and vb2_core_expbuf.
>
>> struct vb2_buffer *vb;
>> int ret;
>>
>> - vb = q->bufs[index];
>> + vb = vb2_get_buffer(q, index);
>> +
>> + if (!vb) {
>> + dprintk(q, 1, "can't find the requested buffer\n");
>> + return -EINVAL;
>> + }
> Changing that avoids having to add this check, so it simplifies the code.
>
> I think that this change can be done in a separate patch before this one.
>
> It makes sense to apply that regardless of the remainder of this series.
>
>> +
>> if (vb->state != VB2_BUF_STATE_DEQUEUED) {
>> dprintk(q, 1, "invalid buffer state %s\n",
>> vb2_state_name(vb->state));
>> @@ -1624,7 +1681,11 @@ static int vb2_start_streaming(struct vb2_queue *q)
>> * correctly return them to vb2.
>> */
>> for (i = 0; i < q->num_buffers; ++i) {
>> - vb = q->bufs[i];
>> + vb = vb2_get_buffer(q, i);
>> +
>> + if (!vb)
>> + continue;
>> +
>> if (vb->state == VB2_BUF_STATE_ACTIVE)
>> vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED);
>> }
>> @@ -1652,7 +1713,12 @@ int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb,
>> return -EIO;
>> }
>>
>> - vb = q->bufs[index];
>> + vb = vb2_get_buffer(q, index);
>> +
>> + if (!vb) {
>> + dprintk(q, 1, "can't find the requested buffer\n");
>> + return -EINVAL;
>> + }
>>
>> if (!req && vb->state != VB2_BUF_STATE_IN_REQUEST &&
>> q->requires_requests) {
>> @@ -2028,12 +2094,18 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
>> * to vb2 in stop_streaming().
>> */
>> if (WARN_ON(atomic_read(&q->owned_by_drv_count))) {
>> - for (i = 0; i < q->num_buffers; ++i)
>> - if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) {
>> + for (i = 0; i < q->num_buffers; ++i) {
>> + struct vb2_buffer *vb = vb2_get_buffer(q, i);
>> +
>> + if (!vb)
>> + continue;
>> +
>> + if (vb->state == VB2_BUF_STATE_ACTIVE) {
>> pr_warn("driver bug: stop_streaming operation is leaving buf %p in active state\n",
>> - q->bufs[i]);
>> - vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR);
>> + vb);
>> + vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
>> }
>> + }
>> /* Must be zero now */
>> WARN_ON(atomic_read(&q->owned_by_drv_count));
>> }
>> @@ -2067,9 +2139,14 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
>> * be changed, so we can't move the buf_finish() to __vb2_dqbuf().
>> */
>> for (i = 0; i < q->num_buffers; ++i) {
>> - struct vb2_buffer *vb = q->bufs[i];
>> - struct media_request *req = vb->req_obj.req;
>> + struct vb2_buffer *vb;
>> + struct media_request *req;
>> +
>> + vb = vb2_get_buffer(q, i);
>> + if (!vb)
>> + continue;
>>
>> + req = vb->req_obj.req;
>> /*
>> * If a request is associated with this buffer, then
>> * call buf_request_cancel() to give the driver to complete()
>> @@ -2219,7 +2296,10 @@ static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off,
>> buffer = (off >> (PLANE_INDEX_SHIFT + PAGE_SHIFT)) & MAX_BUFFERS;
>> plane = (off >> PAGE_SHIFT) & PLANE_INDEX_MASK;
>>
>> - vb = q->bufs[buffer];
>> + vb = vb2_get_buffer(q, buffer);
>> + if (!vb)
>> + return -EINVAL;
>> +
>> if (vb->planes[plane].m.offset == off) {
>> *_buffer = buffer;
>> *_plane = plane;
>> @@ -2262,7 +2342,12 @@ int vb2_core_expbuf(struct vb2_queue *q, int *fd, unsigned int type,
>> return -EINVAL;
>> }
>>
>> - vb = q->bufs[index];
>> + vb = vb2_get_buffer(q, index);
>> +
>> + if (!vb) {
>> + dprintk(q, 1, "can't find the requested buffer\n");
>> + return -EINVAL;
>> + }
>>
>> if (plane >= vb->num_planes) {
>> dprintk(q, 1, "buffer plane out of range\n");
>> @@ -2339,7 +2424,13 @@ int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma)
>> if (ret)
>> goto unlock;
>>
>> - vb = q->bufs[buffer];
>> + vb = vb2_get_buffer(q, buffer);
>> +
>> + if (!vb) {
>> + dprintk(q, 1, "can't find the requested buffer\n");
>> + ret = -EINVAL;
>> + goto unlock;
>> + }
>>
>> /*
>> * MMAP requires page_aligned buffers.
>> @@ -2396,7 +2487,12 @@ unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
>> if (ret)
>> goto unlock;
>>
>> - vb = q->bufs[buffer];
>> + vb = vb2_get_buffer(q, buffer);
>> + if (!vb) {
>> + dprintk(q, 1, "can't find the requested buffer\n");
>> + ret = -EINVAL;
>> + goto unlock;
>> + }
>>
>> vaddr = vb2_plane_vaddr(vb, plane);
>> mutex_unlock(&q->mmap_lock);
>> @@ -2625,6 +2721,7 @@ struct vb2_fileio_data {
>> static int __vb2_init_fileio(struct vb2_queue *q, int read)
>> {
>> struct vb2_fileio_data *fileio;
>> + struct vb2_buffer *vb;
>> int i, ret;
>> unsigned int count = 0;
>>
>> @@ -2679,7 +2776,13 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read)
>> * Check if plane_count is correct
>> * (multiplane buffers are not supported).
>> */
>> - if (q->bufs[0]->num_planes != 1) {
>> + vb = vb2_get_buffer(q, 0);
>> + if (!vb) {
>> + ret = -EBUSY;
>> + goto err_reqbufs;
>> + }
> This cannot happen. These fileio helper functions implement the read() support
> and all the buffer allocation happens here. Userspace can never add or delete
> buffers later, so there will never be holes. It is safe to assume that
> vb2_get_buffer(q, i) will always return a valid vb pointer for i in the range
> of 0 - q->num_buffers-1.
>
> Perhaps add a comment to that effect, but otherwise you can drop the checks.
I will reuse your words and put that in v6
>
>> +
>> + if (vb->num_planes != 1) {
>> ret = -EBUSY;
>> goto err_reqbufs;
>> }
>> @@ -2688,12 +2791,17 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read)
>> * Get kernel address of each buffer.
>> */
>> for (i = 0; i < q->num_buffers; i++) {
>> - fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0);
>> + vb = vb2_get_buffer(q, i);
>> +
>> + if (!vb)
>> + continue;
>> +
>> + fileio->bufs[i].vaddr = vb2_plane_vaddr(vb, 0);
>> if (fileio->bufs[i].vaddr == NULL) {
>> ret = -EINVAL;
>> goto err_reqbufs;
>> }
>> - fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0);
>> + fileio->bufs[i].size = vb2_plane_size(vb, 0);
>> }
>>
>> /*
>> @@ -2821,15 +2929,18 @@ static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_
>>
>> fileio->cur_index = index;
>> buf = &fileio->bufs[index];
>> - b = q->bufs[index];
>> + b = vb2_get_buffer(q, index);
>> +
>> + if (!b)
>> + return -EINVAL;
>>
>> /*
>> * Get number of bytes filled by the driver
>> */
>> buf->pos = 0;
>> buf->queued = 0;
>> - buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0)
>> - : vb2_plane_size(q->bufs[index], 0);
>> + buf->size = read ? vb2_get_plane_payload(b, 0)
>> + : vb2_plane_size(b, 0);
>> /* Compensate for data_offset on read in the multiplanar case. */
>> if (is_multiplanar && read &&
>> b->planes[0].data_offset < buf->size) {
>> @@ -2872,8 +2983,12 @@ static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_
>> * Queue next buffer if required.
>> */
>> if (buf->pos == buf->size || (!read && fileio->write_immediately)) {
>> - struct vb2_buffer *b = q->bufs[index];
>> + struct vb2_buffer *b = vb2_get_buffer(q, index);
>>
>> + if (!b) {
>> + dprintk(q, 1, "can't find the requested buffer\n");
>> + return -EINVAL;
>> + }
>> /*
>> * Check if this is the last buffer to read.
>> */
>> @@ -2899,7 +3014,7 @@ static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_
>> */
>> buf->pos = 0;
>> buf->queued = 1;
>> - buf->size = vb2_plane_size(q->bufs[index], 0);
>> + buf->size = vb2_plane_size(b, 0);
>> fileio->q_count += 1;
>> /*
>> * If we are queuing up buffers for the first time, then
>> @@ -2970,7 +3085,9 @@ static int vb2_thread(void *data)
>> * Call vb2_dqbuf to get buffer back.
>> */
>> if (prequeue) {
>> - vb = q->bufs[index++];
>> + vb = vb2_get_buffer(q, index++);
>> + if (!vb)
>> + continue;
>> prequeue--;
>> } else {
>> call_void_qop(q, wait_finish, q);
>> @@ -2979,7 +3096,7 @@ static int vb2_thread(void *data)
>> call_void_qop(q, wait_prepare, q);
>> dprintk(q, 5, "file io: vb2_dqbuf result: %d\n", ret);
>> if (!ret)
>> - vb = q->bufs[index];
>> + vb = vb2_get_buffer(q, index);
>> }
>> if (ret || threadio->stop)
>> break;
>> diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
>> index c7a54d82a55e..724135d41f7f 100644
>> --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
>> +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
>> @@ -383,8 +383,7 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *md
>> return -EINVAL;
>> }
>>
>> - if (q->bufs[b->index] == NULL) {
>> - /* Should never happen */
>> + if (!vb2_get_buffer(q, b->index)) {
>> dprintk(q, 1, "%s: buffer is NULL\n", opname);
> How about:
>
> dprintk(q, 1, "%s: buffer %u was deleted\n", opname, b->index);
>
> although perhaps that change is more appropriate in patch 09/10?
>
> Regardless, once it is possible to delete buffers, then this message should be
> adjusted accordingly.
I will update the same in the patch introducing DELETE_BUFS
>
>> return -EINVAL;
>> }
>> @@ -394,7 +393,7 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *md
>> return -EINVAL;
>> }
>>
>> - vb = q->bufs[b->index];
>> + vb = vb2_get_buffer(q, b->index);
> This can be moved up to the 'if (!vb2_get_buffer(q, b->index)) {' check above.
> That avoids calling vb2_get_buffer twice.
ok
>
>> vbuf = to_vb2_v4l2_buffer(vb);
>> ret = __verify_planes_array(vb, b);
>> if (ret)
>> @@ -628,11 +627,18 @@ static const struct vb2_buf_ops v4l2_buf_ops = {
>> struct vb2_buffer *vb2_find_buffer(struct vb2_queue *q, u64 timestamp)
>> {
>> unsigned int i;
>> + struct vb2_buffer *vb2;
>>
>> - for (i = 0; i < q->num_buffers; i++)
>> - if (q->bufs[i]->copied_timestamp &&
>> - q->bufs[i]->timestamp == timestamp)
>> - return vb2_get_buffer(q, i);
> Perhaps add a comment here that this loop doesn't scale if there
> is a really large number of buffers and something more efficient
> will have to be found in that case.
You will have it in v6
>
>> + for (i = 0; i < q->num_buffers; i++) {
>> + vb2 = vb2_get_buffer(q, i);
>> +
>> + if (!vb2)
>> + continue;
>> +
>> + if (vb2->copied_timestamp &&
>> + vb2->timestamp == timestamp)
>> + return vb2;
>> + }
>> return NULL;
>> }
>> EXPORT_SYMBOL_GPL(vb2_find_buffer);
>> @@ -664,7 +670,13 @@ int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b)
>> dprintk(q, 1, "buffer index out of range\n");
>> return -EINVAL;
>> }
>> - vb = q->bufs[b->index];
>> + vb = vb2_get_buffer(q, b->index);
>> +
>> + if (!vb) {
>> + dprintk(q, 1, "can't find the requested buffer\n");
>> + return -EINVAL;
>> + }
>> +
>> ret = __verify_planes_array(vb, b);
>> if (!ret)
>> vb2_core_querybuf(q, b->index, b);
>> diff --git a/drivers/media/platform/amphion/vpu_dbg.c b/drivers/media/platform/amphion/vpu_dbg.c
>> index 982c2c777484..a462d6fe4ea9 100644
>> --- a/drivers/media/platform/amphion/vpu_dbg.c
>> +++ b/drivers/media/platform/amphion/vpu_dbg.c
>> @@ -140,11 +140,18 @@ static int vpu_dbg_instance(struct seq_file *s, void *data)
>>
>> vq = v4l2_m2m_get_src_vq(inst->fh.m2m_ctx);
>> for (i = 0; i < vq->num_buffers; i++) {
>> - struct vb2_buffer *vb = vq->bufs[i];
>> - struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
>> + struct vb2_buffer *vb;
>> + struct vb2_v4l2_buffer *vbuf;
>> +
>> + vb = vb2_get_buffer(vq, i);
>> + if (!vb)
>> + continue;
>>
>> if (vb->state == VB2_BUF_STATE_DEQUEUED)
>> continue;
>> +
>> + vbuf = to_vb2_v4l2_buffer(vb);
>> +
>> num = scnprintf(str, sizeof(str),
>> "output [%2d] state = %10s, %8s\n",
>> i, vb2_stat_name[vb->state],
>> @@ -155,11 +162,18 @@ static int vpu_dbg_instance(struct seq_file *s, void *data)
>>
>> vq = v4l2_m2m_get_dst_vq(inst->fh.m2m_ctx);
>> for (i = 0; i < vq->num_buffers; i++) {
>> - struct vb2_buffer *vb = vq->bufs[i];
>> - struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
>> + struct vb2_buffer *vb;
>> + struct vb2_v4l2_buffer *vbuf;
>> +
>> + vb = vb2_get_buffer(vq, i);
>> + if (!vb)
>> + continue;
>>
>> if (vb->state == VB2_BUF_STATE_DEQUEUED)
>> continue;
>> +
>> + vbuf = to_vb2_v4l2_buffer(vb);
>> +
>> num = scnprintf(str, sizeof(str),
>> "capture[%2d] state = %10s, %8s\n",
>> i, vb2_stat_name[vb->state],
> This can be a separate patch, right? It doesn't depend on any core changes.
>
> And this can also be applied before this patch.
>
>> diff --git a/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c b/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
>> index 621038aab116..62910a1b8a98 100644
>> --- a/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
>> +++ b/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
>> @@ -603,7 +603,11 @@ static int mtk_jpeg_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
>> return -EINVAL;
>> }
>>
>> - vb = vq->bufs[buf->index];
>> + vb = vb2_get_buffer(vq, buf->index);
>> + if (!vb) {
>> + dev_err(ctx->jpeg->dev, "buffer not found\n");
>> + return -EINVAL;
>> + }
>> jpeg_src_buf = mtk_jpeg_vb2_to_srcbuf(vb);
>> jpeg_src_buf->bs_size = buf->m.planes[0].bytesused;
>>
> Ditto.
>
>> diff --git a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_req_lat_if.c b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_req_lat_if.c
>> index e393e3e668f8..3d2ae0e1b5b6 100644
>> --- a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_req_lat_if.c
>> +++ b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_req_lat_if.c
>> @@ -1696,7 +1696,7 @@ static int vdec_vp9_slice_setup_core_buffer(struct vdec_vp9_slice_instance *inst
>>
>> /* update internal buffer's width/height */
>> for (i = 0; i < vq->num_buffers; i++) {
>> - if (vb == vq->bufs[i]) {
>> + if (vb == vb2_get_buffer(vq, i)) {
>> instance->dpb[i].width = w;
>> instance->dpb[i].height = h;
>> break;
> Ditto.
>
>> diff --git a/drivers/media/platform/st/sti/hva/hva-v4l2.c b/drivers/media/platform/st/sti/hva/hva-v4l2.c
>> index 3a848ca32a0e..326be09bdb55 100644
>> --- a/drivers/media/platform/st/sti/hva/hva-v4l2.c
>> +++ b/drivers/media/platform/st/sti/hva/hva-v4l2.c
>> @@ -577,6 +577,10 @@ static int hva_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
>> }
>>
>> vb2_buf = vb2_get_buffer(vq, buf->index);
>> + if (!vb2_buf) {
>> + dev_dbg(dev, "%s buffer index %d not found\n", ctx->name, buf->index);
>> + return -EINVAL;
>> + }
>> stream = to_hva_stream(to_vb2_v4l2_buffer(vb2_buf));
>> stream->bytesused = buf->bytesused;
>> }
> Ditto.
>
>> diff --git a/drivers/media/test-drivers/visl/visl-dec.c b/drivers/media/test-drivers/visl/visl-dec.c
>> index 318d675e5668..ba20ea998d19 100644
>> --- a/drivers/media/test-drivers/visl/visl-dec.c
>> +++ b/drivers/media/test-drivers/visl/visl-dec.c
>> @@ -290,13 +290,20 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
>> for (i = 0; i < out_q->num_buffers; i++) {
>> char entry[] = "index: %u, state: %s, request_fd: %d, ";
>> u32 old_len = len;
>> - char *q_status = visl_get_vb2_state(out_q->bufs[i]->state);
>> + struct vb2_buffer *vb2;
>> + char *q_status;
>> +
>> + vb2 = vb2_get_buffer(out_q, i);
>> + if (!vb2)
>> + continue;
>> +
>> + q_status = visl_get_vb2_state(vb2->state);
>>
>> len += scnprintf(&buf[len], TPG_STR_BUF_SZ - len,
>> entry, i, q_status,
>> - to_vb2_v4l2_buffer(out_q->bufs[i])->request_fd);
>> + to_vb2_v4l2_buffer(vb2)->request_fd);
>>
>> - len += visl_fill_bytesused(to_vb2_v4l2_buffer(out_q->bufs[i]),
>> + len += visl_fill_bytesused(to_vb2_v4l2_buffer(vb2),
>> &buf[len],
>> TPG_STR_BUF_SZ - len);
>>
>> @@ -342,13 +349,20 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
>> len = 0;
>> for (i = 0; i < cap_q->num_buffers; i++) {
>> u32 old_len = len;
>> - char *q_status = visl_get_vb2_state(cap_q->bufs[i]->state);
>> + struct vb2_buffer *vb2;
>> + char *q_status;
>> +
>> + vb2 = vb2_get_buffer(cap_q, i);
>> + if (!vb2)
>> + continue;
>> +
>> + q_status = visl_get_vb2_state(vb2->state);
>>
>> len += scnprintf(&buf[len], TPG_STR_BUF_SZ - len,
>> "index: %u, status: %s, timestamp: %llu, is_held: %d",
>> - cap_q->bufs[i]->index, q_status,
>> - cap_q->bufs[i]->timestamp,
>> - to_vb2_v4l2_buffer(cap_q->bufs[i])->is_held);
>> + vb2->index, q_status,
>> + vb2->timestamp,
>> + to_vb2_v4l2_buffer(vb2)->is_held);
>>
>> tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, &buf[old_len]);
>> frame_dprintk(ctx->dev, run->dst->sequence, "%s", &buf[old_len]);
> Ditto.
>
>> diff --git a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
>> index d2174156573a..4b65c69fa60d 100644
>> --- a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
>> +++ b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
>> @@ -1061,7 +1061,7 @@ static int atomisp_dqbuf_wrapper(struct file *file, void *fh, struct v4l2_buffer
>> if (ret)
>> return ret;
>>
>> - vb = pipe->vb_queue.bufs[buf->index];
>> + vb = vb2_get_buffer(&pipe->vb_queue, buf->index);
>> frame = vb_to_frame(vb);
>>
>> buf->reserved = asd->frame_status[buf->index];
> Ditto.
>
> Background: I think it is really useful to merge a lot of the groundwork early
> on, where possible. It simplifies the remainder of the patch series.
>
> Regards,
>
> Hans
>
More information about the linux-arm-kernel
mailing list