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Message-ID: <2cdf728b-f58d-03fa-7ae4-58cbef4c4624@linaro.org>
Date: Mon, 14 Nov 2016 11:42:25 +0200
From: Stanimir Varbanov <stanimir.varbanov@...aro.org>
To: Hans Verkuil <hverkuil@...all.nl>,
Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Andy Gross <andy.gross@...aro.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Stephen Boyd <sboyd@...eaurora.org>,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 3/9] media: venus: adding core part and helper
functions
Hi Hans,
Thanks for the comments!
On 11/11/2016 01:32 PM, Hans Verkuil wrote:
> Hi Stanimir,
>
> Some comments:
>
> On 11/07/2016 06:33 PM, Stanimir Varbanov wrote:
>> * core.c has implemented the platform dirver methods, file
>> operations and v4l2 registration.
>>
>> * helpers.c has implemented common helper functions for:
>> - buffer management
>>
>> - vb2_ops and functions for format propagation,
>>
>> - functions for allocating and freeing buffers for
>> internal usage. The buffer parameters describing internal
>> buffers depends on current format, resolution and codec.
>>
>> - functions for calculation of current load of the
>> hardware. Depending on the count of instances and
>> resolutions it selects the best clock rate for the video
>> core.
>>
>> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
>> ---
>> drivers/media/platform/qcom/venus/core.c | 557 +++++++++++++++++++++++++
>> drivers/media/platform/qcom/venus/core.h | 261 ++++++++++++
>> drivers/media/platform/qcom/venus/helpers.c | 612 ++++++++++++++++++++++++++++
>> drivers/media/platform/qcom/venus/helpers.h | 43 ++
>> 4 files changed, 1473 insertions(+)
>> create mode 100644 drivers/media/platform/qcom/venus/core.c
>> create mode 100644 drivers/media/platform/qcom/venus/core.h
>> create mode 100644 drivers/media/platform/qcom/venus/helpers.c
>> create mode 100644 drivers/media/platform/qcom/venus/helpers.h
>>
>
> <snip>
>
>> diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
>> new file mode 100644
>> index 000000000000..21ed053aeb17
>> --- /dev/null
>> +++ b/drivers/media/platform/qcom/venus/core.h
>
> <snip>
>
>> +struct venus_ctrl {
>> + u32 id;
>> + enum v4l2_ctrl_type type;
>> + s32 min;
>> + s32 max;
>> + s32 def;
>> + u32 step;
>> + u64 menu_skip_mask;
>> + u32 flags;
>> + const char * const *qmenu;
>> +};
>
> Why duplicate struct v4l2_ctrl_config? Just use that struct to define custom controls
> together with v4l2_ctrl_new_custom().
OK, I will rework the controls to avoid struct v4l2_ctrl_config duplication.
>
>> +
>> +/*
>> + * Offset base for buffers on the destination queue - used to distinguish
>> + * between source and destination buffers when mmapping - they receive the same
>> + * offsets but for different queues
>> + */
>> +#define DST_QUEUE_OFF_BASE (1 << 30)
>> +
>> +static inline struct venus_inst *to_inst(struct file *filp)
>> +{
>> + return container_of(filp->private_data, struct venus_inst, fh);
>> +}
>> +
>> +static inline void *to_hfi_priv(struct venus_core *core)
>> +{
>> + return core->priv;
>> +}
>> +
>> +static inline struct vb2_queue *
>> +to_vb2q(struct file *file, enum v4l2_buf_type type)
>> +{
>> + struct venus_inst *inst = to_inst(file);
>> +
>> + if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
>> + return &inst->bufq_cap;
>> + else if (type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
>> + return &inst->bufq_out;
>> +
>> + return NULL;
>> +}
>> +
>> +#endif
>> diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
>> new file mode 100644
>> index 000000000000..c2d1446ad254
>> --- /dev/null
>> +++ b/drivers/media/platform/qcom/venus/helpers.c
>
> <snip>
>
>> +void vidc_vb2_stop_streaming(struct vb2_queue *q)
>> +{
>> + struct venus_inst *inst = vb2_get_drv_priv(q);
>> + struct venus_core *core = inst->core;
>> + struct device *dev = core->dev;
>> + struct vb2_queue *other_queue;
>> + struct vidc_buffer *buf, *n;
>> + enum vb2_buffer_state state;
>> + int ret;
>> +
>> + if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
>> + other_queue = &inst->bufq_cap;
>> + else
>> + other_queue = &inst->bufq_out;
>> +
>> + if (!vb2_is_streaming(other_queue))
>> + return;
>
> This seems wrong to me: this return means that the buffers of queue q are never
> released. Either drop this 'if' or release both queues when the last queue
> stops streaming. I think dropping the 'if' is best.
I have done this way because hfi_session_stop must be called only once,
and buffers will be released on first streamoff for both queues.
>
>> +
>> + ret = hfi_session_stop(inst);
>> + if (ret) {
>> + dev_err(dev, "session: stop failed (%d)\n", ret);
>> + goto abort;
>> + }
>> +
>> + ret = hfi_session_unload_res(inst);
>> + if (ret) {
>> + dev_err(dev, "session: release resources failed (%d)\n", ret);
>> + goto abort;
>> + }
>> +
>> + ret = session_unregister_bufs(inst);
>> + if (ret) {
>> + dev_err(dev, "failed to release capture buffers: %d\n", ret);
>> + goto abort;
>> + }
>> +
>> + ret = intbufs_free(inst);
>> +
>> + if (inst->state == INST_INVALID || core->state == CORE_INVALID)
>> + ret = -EINVAL;
>> +
>> +abort:
>> + if (ret)
>> + hfi_session_abort(inst);
>> +
>> + load_scale_clocks(core);
>> +
>> + ret = hfi_session_deinit(inst);
>> +
>> + pm_runtime_put_sync(dev);
>> +
>> + mutex_lock(&inst->bufqueue_lock);
>> +
>> + if (list_empty(&inst->bufqueue)) {
>> + mutex_unlock(&inst->bufqueue_lock);
>> + return;
>> + }
>> +
>> + if (ret)
>> + state = VB2_BUF_STATE_ERROR;
>> + else
>> + state = VB2_BUF_STATE_DONE;
>
> Are you sure that the state depends on 'ret'? Usually when stop_streaming is
> called none of the pending buffers are filled with valid frame data, so the
> state is set to ERROR.
>
> STATE_DONE implies that the contents of the buffers has valid frame data.
OK I will return STATE_ERROR for all released buffers.
>
>> +
>> + list_for_each_entry_safe(buf, n, &inst->bufqueue, list) {
>> + vb2_buffer_done(&buf->vb.vb2_buf, state);
>> + list_del(&buf->list);
>> + }
>> +
>> + mutex_unlock(&inst->bufqueue_lock);
>> +}
>> +
>> +int vidc_vb2_start_streaming(struct venus_inst *inst)
>> +{
>> + struct venus_core *core = inst->core;
>> + struct vidc_buffer *buf, *n;
>> + int ret;
>> +
>> + ret = intbufs_alloc(inst);
>> + if (ret)
>> + return ret;
>
> This should still release all buffers instead of returning an error.
Yes, thanks for catching this.
>
>> +
>> + ret = session_register_bufs(inst);
>> + if (ret)
>> + goto err_bufs_free;
>> +
>> + load_scale_clocks(core);
>> +
>> + ret = hfi_session_load_res(inst);
>> + if (ret)
>> + goto err_unreg_bufs;
>> +
>> + ret = hfi_session_start(inst);
>> + if (ret)
>> + goto err_unload_res;
>> +
>> + mutex_lock(&inst->bufqueue_lock);
>> + list_for_each_entry_safe(buf, n, &inst->bufqueue, list) {
>> + ret = session_set_buf(&buf->vb.vb2_buf);
>> + if (ret)
>> + break;
>> + }
>> + mutex_unlock(&inst->bufqueue_lock);
>> +
>> + if (ret)
>> + goto err_session_stop;
>> +
>> + return 0;
>> +
>> +err_session_stop:
>> + hfi_session_stop(inst);
>> +err_unload_res:
>> + hfi_session_unload_res(inst);
>> +err_unreg_bufs:
>> + session_unregister_bufs(inst);
>> +err_bufs_free:
>> + intbufs_free(inst);
>> +
>> + mutex_lock(&inst->bufqueue_lock);
>> +
>> + if (list_empty(&inst->bufqueue))
>> + goto err_done;
>> +
>> + list_for_each_entry_safe(buf, n, &inst->bufqueue, list) {
>> + vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
>> + list_del(&buf->list);
>> + }
>
> I think this is done in the wrong place. The vdec has its own high level start_streaming
> that calls this function, but that high level function doesn't release the buffers at
> all if there is an error. Same for venc. I propose that you make a new function that
> just releases the buffers and call that from the vdec/venc start_streaming function
> whenever an error occurs.
yes, that is a good suggestion.
--
regards,
Stan
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