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

On Mon, Oct 11, 2021 at 03:02:43PM +0800, Yunfei Dong 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.
>

Avoid the kthread API and instead go with the workqueue API.

See Documentation/core-api/workqueue.rst and include/linux/workqueue.h.

Thanks!
Ezequiel

> Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
> ---
> .../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);
> + 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)
>
> /*
> * 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");
> + else
> + lat_buf->core_decode(lat_buf);
> +
> + mtk_vcodec_set_curr_ctx(dev, NULL, MTK_VDEC_CORE);
> + vdec_msg_queue_qbuf(&ctx->msg_queue.lat_ctx, lat_buf);
> + }
> +
> + mtk_v4l2_debug(3, "Video Capture Thread End");
> + return 0;
> +}
> diff --git a/drivers/media/platform/mtk-vcodec/vdec_msg_queue.h b/drivers/media/platform/mtk-vcodec/vdec_msg_queue.h
> index 1905ce713592..b5745b144140 100644
> --- a/drivers/media/platform/mtk-vcodec/vdec_msg_queue.h
> +++ b/drivers/media/platform/mtk-vcodec/vdec_msg_queue.h
> @@ -148,4 +148,10 @@ void vdec_msg_queue_deinit(
> struct vdec_msg_queue *msg_queue,
> struct mtk_vcodec_ctx *ctx);
>
> +/**
> + * vdec_msg_queue_core_thead - used for core decoder.
> + * @data: private data used for each codec
> + */
> +int vdec_msg_queue_core_thead(void *data);
> +
> #endif
> --
> 2.25.1
>

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