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Message-ID: <385bd033f88eba79262f1dd25fbd98dc9089bf8d.camel@mediatek.com>
Date: Mon, 13 Dec 2021 16:52:42 +0800
From: "yunfei.dong@...iatek.com" <yunfei.dong@...iatek.com>
To: Steve Cho <stevecho@...omium.org>
CC: Alexandre Courbot <acourbot@...omium.org>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Tzung-Bi Shih <tzungbi@...omium.org>,
"Tiffany Lin" <tiffany.lin@...iatek.com>,
Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Tomasz Figa <tfiga@...gle.com>,
Hsin-Yi Wang <hsinyi@...omium.org>,
"Fritz Koenig" <frkoenig@...omium.org>,
Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
Benjamin Gaignard <benjamin.gaignard@...labora.com>,
Daniel Vetter <daniel@...ll.ch>,
dri-devel <dri-devel@...ts.freedesktop.org>,
Irui Wang <irui.wang@...iatek.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
<linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<srv_heupstream@...iatek.com>,
<linux-mediatek@...ts.infradead.org>,
<Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v12, 13/19] media: mtk-vcodec: Add work queue for core
hardware decode
Hi steve,
Thanks for your suggestion.
On Thu, 2021-12-09 at 15:44 -0800, Steve Cho wrote:
> On Wed, Dec 1, 2021 at 7:46 PM Yunfei Dong <yunfei.dong@...iatek.com>
> wrote:
> >
> > Add work queue to process core hardware information.
> > First, get lat_buf from message queue, then call core
> > hardware of each codec(H264/VP9/AV1) to decode, finally
> > puts lat_buf back to the message.
> >
> > Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
> > ---
> > .../platform/mtk-vcodec/mtk_vcodec_dec_drv.c | 16 +++++++-
> > .../platform/mtk-vcodec/mtk_vcodec_drv.h | 3 ++
> > .../platform/mtk-vcodec/vdec_msg_queue.c | 41
> > ++++++++++++++++---
> > .../platform/mtk-vcodec/vdec_msg_queue.h | 8 ++--
> > 4 files changed, 57 insertions(+), 11 deletions(-)
> >
> > 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 d460703f335d..4fbff61d2334 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > @@ -341,6 +341,17 @@ static int mtk_vcodec_probe(struct
> > platform_device *pdev)
> > goto err_dec_pm;
> > }
> >
> > + if (IS_VDEC_LAT_ARCH(dev->vdec_pdata->hw_arch)) {
> > + vdec_msg_queue_init_ctx(&dev->msg_queue_core_ctx,
> > MTK_VDEC_CORE);
> > + dev->core_workqueue =
> > alloc_ordered_workqueue("core-decoder",
> > + WQ_MEM_RECLAIM | WQ_FREEZABLE);
> > + if (!dev->core_workqueue) {
> > + mtk_v4l2_err("Failed to create core
> > workqueue");
> > + ret = -EINVAL;
> > + goto err_res;
> > + }
> > + }
> > +
> > for (i = 0; i < MTK_VDEC_HW_MAX; i++)
> > mutex_init(&dev->dec_mutex[i]);
> > spin_lock_init(&dev->irqlock);
> > @@ -351,7 +362,7 @@ static int mtk_vcodec_probe(struct
> > platform_device *pdev)
> > ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
> > if (ret) {
> > mtk_v4l2_err("v4l2_device_register err=%d", ret);
> > - goto err_res;
> > + goto err_core_workq;
> > }
> >
> > init_waitqueue_head(&dev->queue);
> > @@ -450,6 +461,9 @@ static int mtk_vcodec_probe(struct
> > platform_device *pdev)
> > video_unregister_device(vfd_dec);
> > err_dec_alloc:
> > v4l2_device_unregister(&dev->v4l2_dev);
> > +err_core_workq:
> > + if (IS_VDEC_LAT_ARCH(dev->vdec_pdata->hw_arch))
> > + destroy_workqueue(dev->core_workqueue);
> > err_res:
> > mtk_vcodec_release_dec_pm(&dev->pm);
> > err_dec_pm:
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > index cbaed96dcfa2..a558cc16026d 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 IS_VDEC_LAT_ARCH(hw_arch) ((hw_arch) >=
> > MTK_VDEC_LAT_SINGLE_CORE)
>
> Basic question: What is practical meaning of this? What architectures
> are supported?
>
This definition is used to separate different architectures.
Pure single core/lat single core at current period is supported.
> >
> > /*
> > * enum mtk_hw_reg_idx - MTK hw register base index
> > @@ -464,6 +465,7 @@ struct mtk_vcodec_enc_pdata {
> > * @dec_capability: used to identify decode capability, ex: 4k
> > * @enc_capability: used to identify encode capability
> > *
> > + * @core_workqueue: queue used for core hardware decode
> > * @msg_queue_core_ctx: msg queue context used for core workqueue
> > *
> > * @subdev_dev: subdev hardware device
> > @@ -506,6 +508,7 @@ struct mtk_vcodec_dev {
> > unsigned int dec_capability;
> > unsigned int enc_capability;
> >
> > + struct workqueue_struct *core_workqueue;
> > struct vdec_msg_queue_ctx msg_queue_core_ctx;
> >
> > void *subdev_dev[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 913aefa67618..24f1d03df9f1 100644
> > --- a/drivers/media/platform/mtk-vcodec/vdec_msg_queue.c
> > +++ b/drivers/media/platform/mtk-vcodec/vdec_msg_queue.c
> > @@ -68,6 +68,9 @@ int vdec_msg_queue_qbuf(struct vdec_msg_queue_ctx
> > *msg_ctx, struct vdec_lat_buf
> >
> > if (msg_ctx->hardware_index != MTK_VDEC_CORE)
> > wake_up_all(&msg_ctx->ready_to_use);
> > + else
> > + queue_work(buf->ctx->dev->core_workqueue,
> > + &buf->ctx->msg_queue.core_work);
>
> need {} for else here?
>
If condition not add "{}", else need not to add "{}" ?
> >
> > mtk_v4l2_debug(3, "enqueue buf type: %d addr: 0x%p num:
> > %d",
> > msg_ctx->hardware_index, buf, msg_ctx->ready_num);
> > @@ -169,8 +172,7 @@ bool vdec_msg_queue_wait_lat_buf_full(struct
> > vdec_msg_queue *msg_queue)
> > return false;
> > }
> >
> > -void vdec_msg_queue_deinit(
> > - struct vdec_msg_queue *msg_queue,
> > +void vdec_msg_queue_deinit(struct vdec_msg_queue *msg_queue,
> > struct mtk_vcodec_ctx *ctx)
> > {
> > struct vdec_lat_buf *lat_buf;
> > @@ -196,10 +198,36 @@ void vdec_msg_queue_deinit(
> > }
> > }
> >
> > -int vdec_msg_queue_init(
> > - struct vdec_msg_queue *msg_queue,
> > - struct mtk_vcodec_ctx *ctx,
> > - core_decode_cb_t core_decode,
> > +static void vdec_msg_queue_core_work(struct work_struct *work)
> > +{
> > + struct vdec_msg_queue *msg_queue =
> > + container_of(work, struct vdec_msg_queue,
> > core_work);
> > + struct mtk_vcodec_ctx *ctx =
> > + container_of(msg_queue, struct mtk_vcodec_ctx,
> > msg_queue);
> > + struct mtk_vcodec_dev *dev = ctx->dev;
> > + struct vdec_lat_buf *lat_buf;
> > +
> > + lat_buf = vdec_msg_queue_dqbuf(&dev->msg_queue_core_ctx);
> > + if (!lat_buf)
> > + return;
>
> If we were to return in this error condition,
> isn't it better to also differentiate this error with return code and
> change void return type?
>
vdec_msg_queue_core_work function is callback for param "func" in
struct work_struct, need not to add return value.
> > +
> > + ctx = lat_buf->ctx;
> > + mtk_vcodec_set_curr_ctx(dev, ctx, MTK_VDEC_CORE);
> > +
> > + 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);
> > +
> > + if (!list_empty(&ctx->msg_queue.lat_ctx.ready_queue)) {
> > + mtk_v4l2_debug(3, "re-schedule to decode for core",
> > + dev->msg_queue_core_ctx.ready_num);
> > + queue_work(dev->core_workqueue, &msg_queue-
> > >core_work);
> > + }
> > +}
> > +
> > +int vdec_msg_queue_init(struct vdec_msg_queue *msg_queue,
> > + struct mtk_vcodec_ctx *ctx, core_decode_cb_t
> > core_decode,
> > int private_size)
> > {
> > struct vdec_lat_buf *lat_buf;
> > @@ -210,6 +238,7 @@ int vdec_msg_queue_init(
> > return 0;
> >
> > vdec_msg_queue_init_ctx(&msg_queue->lat_ctx,
> > MTK_VDEC_LAT0);
> > + INIT_WORK(&msg_queue->core_work, vdec_msg_queue_core_work);
> > msg_queue->wdma_addr.size = vde_msg_queue_get_trans_size(
> > ctx->picinfo.buf_w, ctx->picinfo.buf_h);
> >
> > diff --git a/drivers/media/platform/mtk-vcodec/vdec_msg_queue.h
> > b/drivers/media/platform/mtk-vcodec/vdec_msg_queue.h
> > index 21a9c0aeb1b4..43eae638a2a8 100644
> > --- a/drivers/media/platform/mtk-vcodec/vdec_msg_queue.h
> > +++ b/drivers/media/platform/mtk-vcodec/vdec_msg_queue.h
> > @@ -67,6 +67,7 @@ struct vdec_lat_buf {
> > * @wdma_addr: wdma address used for ube
> > * @wdma_rptr_addr: ube read point
> > * @wdma_wptr_addr: ube write point
> > + * @core_work: core hardware work
> > * @lat_ctx: used to store lat buffer list
> > */
> > struct vdec_msg_queue {
> > @@ -76,6 +77,7 @@ struct vdec_msg_queue {
> > uint64_t wdma_rptr_addr;
> > uint64_t wdma_wptr_addr;
> >
> > + struct work_struct core_work;
> > struct vdec_msg_queue_ctx lat_ctx;
> > };
> >
> > @@ -86,10 +88,8 @@ struct vdec_msg_queue {
> > * @core_decode: core decode callback for each codec
> > * @private_size: the private data size used to share with core
> > */
> > -int vdec_msg_queue_init(
> > - struct vdec_msg_queue *msg_queue,
> > - struct mtk_vcodec_ctx *ctx,
> > - core_decode_cb_t core_decode,
> > +int vdec_msg_queue_init(struct vdec_msg_queue *msg_queue,
> > + struct mtk_vcodec_ctx *ctx, core_decode_cb_t
> > core_decode,
>
> Not sure about the formatting rule, but is it supposed to be one
> param per line?
> If so, this comment also applied to function definition part.
>
> > int private_size);
> >
I try to review other files, it looks that two or more parameters per
line is ok. Whether you mean that we'd better to write one parameter
per line?
int vdec_msg_queue_init(struct vdec_msg_queue *msg_queue,
struct mtk_vcodec_ctx *ctx,
core_decode_cb_t
Thanks,
Yunfei Dong
> > /**
> > --
> > 2.25.1
> >
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