Re: [PATCH v7, 11/15] media: mtk-vcodec: Add core thread

["yunfei.dong@mediatek.com" <yunfei.dong@mediatek.com>]

Hi AngeloGioacchino,

Thanks for your suggestion.
On Thu, 2021-10-14 at 12:56 +0200, AngeloGioacchino Del Regno wrote:
> > Core thread:
> > 1. Gets lat_buf from core msg queue.
> > 2. Proceeds core decode.
> > 3. Puts the lat_buf back to lat msg queue.
> > 
> > Both H264 and VP9 rely on the core thread.
> > 
> > Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
> 
> I would be happier to see a better commit message, for example:
> "Introduce a core thread, responsible for... getting lat_buf from ...
> which then proceeds core decode by ... and finally, puts the lat_buf
> back to the lat message queue"
> 
> > ---
> >   .../platform/mtk-vcodec/mtk_vcodec_dec_drv.c  | 12 +++++++
> >   .../platform/mtk-vcodec/mtk_vcodec_drv.h      |  7 ++++
> >   .../platform/mtk-vcodec/vdec_msg_queue.c      | 32
> > +++++++++++++++++++
> >   .../platform/mtk-vcodec/vdec_msg_queue.h      |  6 ++++
> >   4 files changed, 57 insertions(+)
> > 
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c 
> > b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > index e21e0c4bcd86..de83e3b821b4 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > @@ -364,6 +364,18 @@ static int mtk_vcodec_probe(struct
> > platform_device *pdev)
> >   		goto err_dec_pm;
> >   	}
> >   
> > +	if (VDEC_LAT_ARCH(dev->vdec_pdata->hw_arch)) {
> > +		vdec_msg_queue_init_ctx(&dev->msg_queue_core_ctx,
> > +			MTK_VDEC_CORE);
> 
> No need to break this line.
> 
Fix in v8.
> > +		dev->kthread_core =
> > kthread_run(vdec_msg_queue_core_thead, dev,
> > +			"mtk-%s", "core");
> 
> Please fix indentation, like so:
> 		dev->kthread_core =
> kthread_run(vdec_msg_queue_core_thead, dev,
> 
> 						"mtk-%s", "core");
> 
> > +		if (IS_ERR(dev->kthread_core)) {
> > +			dev_err(&pdev->dev, "Failed to create core
> > thread");
> > +			ret = PTR_ERR(dev->kthread_core);
> > +			goto err_res;
> > +		}
> > +	}
> > +
> >   	for (i = 0; i < MTK_VDEC_HW_MAX; i++)
> >   		mutex_init(&dev->dec_mutex[i]);
> >   	spin_lock_init(&dev->irqlock);
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > index 9d072c082f73..68a9b1a2d3b3 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > @@ -27,6 +27,7 @@
> >   #define MTK_VCODEC_MAX_PLANES	3
> >   #define MTK_V4L2_BENCHMARK	0
> >   #define WAIT_INTR_TIMEOUT_MS	1000
> > +#define VDEC_LAT_ARCH(hw_arch) ((hw_arch) >=
> > MTK_VDEC_LAT_SINGLE_CORE)
> 
> I'd propose to change this to IS_VDEC_LAT_ARCH(hw_arch): that would
> increase human
> readability when using this macro.
> 
Fix in v8.
> >   
> >   /*
> >    * enum mtk_hw_reg_idx - MTK hw register base index
> > @@ -466,6 +467,9 @@ struct mtk_vcodec_enc_pdata {
> >    * @comp_dev: component hardware device
> >    * @component_node: component node
> >    *
> > + * @kthread_core: thread used for core hardware decode
> > + * @msg_queue_core_ctx: msg queue context used for core thread
> > + *
> >    * @hardware_bitmap: used to record hardware is ready or not
> >    */
> >   struct mtk_vcodec_dev {
> > @@ -508,6 +512,9 @@ struct mtk_vcodec_dev {
> >   	void *comp_dev[MTK_VDEC_HW_MAX];
> >   	struct device_node *component_node[MTK_VDEC_HW_MAX];
> >   
> > +	struct task_struct *kthread_core;
> > +	struct vdec_msg_queue_ctx msg_queue_core_ctx;
> > +
> >   	DECLARE_BITMAP(hardware_bitmap, MTK_VDEC_HW_MAX);
> >   };
> >   
> > diff --git a/drivers/media/platform/mtk-vcodec/vdec_msg_queue.c
> > b/drivers/media/platform/mtk-vcodec/vdec_msg_queue.c
> > index d66ed98c79a9..665f571eab4b 100644
> > --- a/drivers/media/platform/mtk-vcodec/vdec_msg_queue.c
> > +++ b/drivers/media/platform/mtk-vcodec/vdec_msg_queue.c
> > @@ -256,3 +256,35 @@ void vdec_msg_queue_deinit(
> >   			kfree(lat_buf->private_data);
> >   	}
> >   }
> > +
> > +int vdec_msg_queue_core_thead(void *data)
> > +{
> > +	struct mtk_vcodec_dev *dev = data;
> > +	struct vdec_lat_buf *lat_buf;
> > +	struct mtk_vcodec_ctx *ctx;
> > +
> > +	set_freezable();
> > +	for (;;) {
> > +		try_to_freeze();
> > +		if (kthread_should_stop())
> > +			break;
> > +
> > +		lat_buf = vdec_msg_queue_dqbuf(&dev-
> > >msg_queue_core_ctx);
> > +		if (!lat_buf)
> > +			continue;
> > +
> > +		ctx = lat_buf->ctx;
> > +		mtk_vcodec_set_curr_ctx(dev, ctx, MTK_VDEC_CORE);
> > +
> > +		if (!lat_buf->core_decode)
> > +			mtk_v4l2_err("Core decode callback func is
> > NULL");
> 
> Is this supposed to really happen?
> I see that this is always initialized in function
> vdec_msg_queue_init().
Fix in v8, using work queue instead of create thread.

Thanks
Yunfei Dong
> 
> Regards,
> - Angelo
> 
>