On 09/05/17 13:37, Kieran Bingham wrote:
> When a suspend/resume action is taken, the pipeline is reset and never
> reconfigured.
>
> To correct this, we establish a new flag pipe->configured and utilise
> this to establish when we write a full configuration set to the current
> display list.
>
> Signed-off-by: Kieran Bingham <[email protected]>
Reporting a bug on my own series:
This patch causes the following warnings to be generated on
vsp-unit-test-0004.sh when based on v4.12-rc1
[ 104.093663] =====================================================
[ 104.099793] WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
[ 104.106452] 4.12.0-rc1-00013-g09081a93f796 #387 Not tainted
[ 104.112054] -----------------------------------------------------
[ 104.118183] yavta/8838 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
[ 104.124572] (vsp1_hgo:206:(&hgo->ctrls.handler)->_lock){+.+...}, at:
[<ffffff80085b12b8>] hgo_configure+0xb0/0x168
[ 104.135097]
and this task is already holding:
[ 104.140959] (&(&pipe->irqlock)->rlock){-.-...}, at: [<ffffff80085ac024>]
vsp1_video_start_streaming+0x8c/0xd0
[ 104.151025] which would create a new lock dependency:
[ 104.156102] (&(&pipe->irqlock)->rlock){-.-...} ->
(vsp1_hgo:206:(&hgo->ctrls.handler)->_lock){+.+...}
[ 104.165469]
but this new dependency connects a HARDIRQ-irq-safe lock:
[ 104.173427] (&(&pipe->irqlock)->rlock){-.-...}
[ 104.173433]
... which became HARDIRQ-irq-safe at:
[ 104.184207] mark_lock+0x1c0/0x6b8
Full log at : http://paste.ubuntu.com/24864203/
Bisected to this patch.
--
Kieran
> ---
>
> Laurent,
>
> Pasting your previous comments on this patch for convenience:
>
>> As discussed face to face, I think a better approach would be to cache the
>> display list instead of recomputing it a resume time. However, given that
>> this
>> will require more work, I could be convinced to merge this patch in the
>> meantime. Let's check in a couple of weeks whether we will have moved
>> forward
>> with display list caching in time for v4.12, and merge this patch otherwise.
>> Your previous
>
> I agree that this could be cached - but that would be a larger development
> reworking all of the display list handling. As such I think this patch still
> provides progression, and we can rework if necessary when we have looked at
> list reuse in more detail.
>
> As I have just re-discovered - this patch requires the DRM/DU to be disabled
> as that does not yet support suspend/resume on that side - (Another topic to
> be revisited)
>
> --
> Kieran
>
>
> drivers/media/platform/vsp1/vsp1_drv.c | 4 ++-
> drivers/media/platform/vsp1/vsp1_pipe.c | 1 +-
> drivers/media/platform/vsp1/vsp1_pipe.h | 4 +-
> drivers/media/platform/vsp1/vsp1_video.c | 56 ++++++++++---------------
> 4 files changed, 31 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/media/platform/vsp1/vsp1_drv.c
> b/drivers/media/platform/vsp1/vsp1_drv.c
> index 048446af5ae7..a77c40c2a39a 100644
> --- a/drivers/media/platform/vsp1/vsp1_drv.c
> +++ b/drivers/media/platform/vsp1/vsp1_drv.c
> @@ -463,6 +463,7 @@ static int vsp1_create_entities(struct vsp1_device *vsp1)
>
> int vsp1_reset_wpf(struct vsp1_device *vsp1, unsigned int index)
> {
> + struct vsp1_rwpf *wpf = vsp1->wpf[index];
> unsigned int timeout;
> u32 status;
>
> @@ -479,6 +480,9 @@ int vsp1_reset_wpf(struct vsp1_device *vsp1, unsigned int
> index)
> usleep_range(1000, 2000);
> }
>
> + if (wpf->pipe)
> + wpf->pipe->configured = false;
> +
> if (!timeout) {
> dev_err(vsp1->dev, "failed to reset wpf.%u\n", index);
> return -ETIMEDOUT;
> diff --git a/drivers/media/platform/vsp1/vsp1_pipe.c
> b/drivers/media/platform/vsp1/vsp1_pipe.c
> index edebf3fa926f..11b2dbf8f322 100644
> --- a/drivers/media/platform/vsp1/vsp1_pipe.c
> +++ b/drivers/media/platform/vsp1/vsp1_pipe.c
> @@ -238,6 +238,7 @@ void vsp1_pipeline_init(struct vsp1_pipeline *pipe)
>
> INIT_LIST_HEAD(&pipe->entities);
> pipe->state = VSP1_PIPELINE_STOPPED;
> + pipe->configured = false;
> }
>
> /* Must be called with the pipe irqlock held. */
> diff --git a/drivers/media/platform/vsp1/vsp1_pipe.h
> b/drivers/media/platform/vsp1/vsp1_pipe.h
> index 91a784a13422..f715d2ba1044 100644
> --- a/drivers/media/platform/vsp1/vsp1_pipe.h
> +++ b/drivers/media/platform/vsp1/vsp1_pipe.h
> @@ -62,6 +62,7 @@ enum vsp1_pipeline_state {
> * @pipe: the media pipeline
> * @irqlock: protects the pipeline state
> * @state: current state
> + * @configured: true if the pipeline has been set up for video streaming
> * @wq: wait queue to wait for state change completion
> * @frame_end: frame end interrupt handler
> * @lock: protects the pipeline use count and stream count
> @@ -89,6 +90,7 @@ struct vsp1_pipeline {
>
> spinlock_t irqlock;
> enum vsp1_pipeline_state state;
> + bool configured;
> wait_queue_head_t wq;
>
> void (*frame_end)(struct vsp1_pipeline *pipe);
> @@ -111,8 +113,6 @@ struct vsp1_pipeline {
>
> struct list_head entities;
>
> - struct vsp1_dl_list *dl;
> -
> unsigned int div_size;
> unsigned int partitions;
> struct v4l2_rect partition;
> diff --git a/drivers/media/platform/vsp1/vsp1_video.c
> b/drivers/media/platform/vsp1/vsp1_video.c
> index 3e9919c613fe..226e6e0b23aa 100644
> --- a/drivers/media/platform/vsp1/vsp1_video.c
> +++ b/drivers/media/platform/vsp1/vsp1_video.c
> @@ -368,18 +368,14 @@ static void vsp1_video_frame_end(struct vsp1_pipeline
> *pipe,
> pipe->buffers_ready |= 1 << video->pipe_index;
> }
>
> -static int vsp1_video_setup_pipeline(struct vsp1_pipeline *pipe)
> +static int vsp1_video_setup_pipeline(struct vsp1_pipeline *pipe,
> + struct vsp1_dl_list *dl)
> {
> struct vsp1_entity *entity;
>
> /* Determine this pipelines sizes for image partitioning support. */
> vsp1_video_pipeline_setup_partitions(pipe);
>
> - /* Prepare the display list. */
> - pipe->dl = vsp1_dl_list_get(pipe->output->dlm);
> - if (!pipe->dl)
> - return -ENOMEM;
> -
> if (pipe->uds) {
> struct vsp1_uds *uds = to_uds(&pipe->uds->subdev);
>
> @@ -399,13 +395,15 @@ static int vsp1_video_setup_pipeline(struct
> vsp1_pipeline *pipe)
> }
>
> list_for_each_entry(entity, &pipe->entities, list_pipe) {
> - vsp1_entity_route_setup(entity, pipe, pipe->dl);
> + vsp1_entity_route_setup(entity, pipe, dl);
>
> if (entity->ops->configure)
> - entity->ops->configure(entity, pipe, pipe->dl,
> + entity->ops->configure(entity, pipe, dl,
> VSP1_ENTITY_PARAMS_INIT);
> }
>
> + pipe->configured = true;
> +
> return 0;
> }
>
> @@ -428,9 +426,16 @@ static void vsp1_video_pipeline_run(struct vsp1_pipeline
> *pipe)
> {
> struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
> struct vsp1_entity *entity;
> + struct vsp1_dl_list *dl;
>
> - if (!pipe->dl)
> - pipe->dl = vsp1_dl_list_get(pipe->output->dlm);
> + dl = vsp1_dl_list_get(pipe->output->dlm);
> + if (!dl) {
> + dev_err(vsp1->dev, "Failed to obtain a dl list\n");
> + return;
> + }
> +
> + if (!pipe->configured)
> + vsp1_video_setup_pipeline(pipe, dl);
>
> /*
> * Start with the runtime parameters as the configure operation can
> @@ -439,45 +444,43 @@ static void vsp1_video_pipeline_run(struct
> vsp1_pipeline *pipe)
> */
> list_for_each_entry(entity, &pipe->entities, list_pipe) {
> if (entity->ops->configure)
> - entity->ops->configure(entity, pipe, pipe->dl,
> + entity->ops->configure(entity, pipe, dl,
> VSP1_ENTITY_PARAMS_RUNTIME);
> }
>
> /* Run the first partition */
> pipe->current_partition = 0;
> - vsp1_video_pipeline_run_partition(pipe, pipe->dl);
> + vsp1_video_pipeline_run_partition(pipe, dl);
>
> /* Process consecutive partitions as necessary */
> for (pipe->current_partition = 1;
> pipe->current_partition < pipe->partitions;
> pipe->current_partition++) {
> - struct vsp1_dl_list *dl;
> + struct vsp1_dl_list *child;
>
> /*
> * Partition configuration operations will utilise
> * the pipe->current_partition variable to determine
> * the work they should complete.
> */
> - dl = vsp1_dl_list_get(pipe->output->dlm);
> + child = vsp1_dl_list_get(pipe->output->dlm);
>
> /*
> * An incomplete chain will still function, but output only
> * the partitions that had a dl available. The frame end
> * interrupt will be marked on the last dl in the chain.
> */
> - if (!dl) {
> + if (!child) {
> dev_err(vsp1->dev, "Failed to obtain a dl list. Frame
> will be incomplete\n");
> break;
> }
>
> - vsp1_video_pipeline_run_partition(pipe, dl);
> - vsp1_dl_list_add_chain(pipe->dl, dl);
> + vsp1_video_pipeline_run_partition(pipe, child);
> + vsp1_dl_list_add_chain(dl, child);
> }
>
> /* Complete, and commit the head display list. */
> - vsp1_dl_list_commit(pipe->dl);
> - pipe->dl = NULL;
> -
> + vsp1_dl_list_commit(dl);
> vsp1_pipeline_run(pipe);
> }
>
> @@ -827,18 +830,10 @@ static int vsp1_video_start_streaming(struct vb2_queue
> *vq, unsigned int count)
> struct vsp1_pipeline *pipe = video->rwpf->pipe;
> bool start_pipeline = false;
> unsigned long flags;
> - int ret;
>
> mutex_lock(&pipe->lock);
> - if (pipe->stream_count == pipe->num_inputs) {
> - ret = vsp1_video_setup_pipeline(pipe);
> - if (ret < 0) {
> - mutex_unlock(&pipe->lock);
> - return ret;
> - }
> -
> + if (pipe->stream_count == pipe->num_inputs)
> start_pipeline = true;
> - }
>
> pipe->stream_count++;
> mutex_unlock(&pipe->lock);
> @@ -883,9 +878,6 @@ static void vsp1_video_stop_streaming(struct vb2_queue
> *vq)
> ret = vsp1_pipeline_stop(pipe);
> if (ret == -ETIMEDOUT)
> dev_err(video->vsp1->dev, "pipeline stop timeout\n");
> -
> - vsp1_dl_list_put(pipe->dl);
> - pipe->dl = NULL;
> }
> mutex_unlock(&pipe->lock);
>
>
