linux-kernel - Re: [PATCH v4 2/3] media: platform: mtk-mdp3: Use cmdq_pkt_create() and cmdq_pkt

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Message-ID: <d5c512d06e013555397722137d5790dc8a627bfd.camel@mediatek.com>
Date: Tue, 3 Sep 2024 09:39:25 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>, "mchehab@...nel.org"
	<mchehab@...nel.org>, Moudy Ho (何宗原)
	<Moudy.Ho@...iatek.com>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v4 2/3] media: platform: mtk-mdp3: Use cmdq_pkt_create()
 and cmdq_pkt_destroy()

Hi, Matthias:

On Mon, 2024-09-02 at 17:31 +0200, Matthias Brugger wrote:
>  	 
> External email : Please do not click links or open attachments until you have verified the sender or the content.
>  
> 
> On 01/09/2024 16:32, Chun-Kuang Hu wrote:
> > Use cmdq_pkt_create() and cmdq_pkt_destroy() common function
> > instead of implementing mdp3 version.
> > 
> > Signed-off-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
> > ---
> >   .../platform/mediatek/mdp3/mtk-mdp3-cmdq.c    | 46 ++-----------------
> >   .../platform/mediatek/mdp3/mtk-mdp3-cmdq.h    |  1 +
> >   2 files changed, 6 insertions(+), 41 deletions(-)
> > 
> > diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
> > index ef5dade35fd3..740a484c8eb4 100644
> > --- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
> > +++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
> > @@ -471,43 +471,6 @@ static int mdp_path_config(struct mdp_dev *mdp, struct mdp_cmdq_cmd *cmd,
> >   return 0;
> >   }
> >   
> > -static int mdp_cmdq_pkt_create(struct cmdq_client *client, struct cmdq_pkt *pkt,
> > -       size_t size)
> > -{
> > -struct device *dev;
> > -dma_addr_t dma_addr;
> > -
> > -pkt->va_base = kzalloc(size, GFP_KERNEL);
> > -if (!pkt->va_base)
> > -return -ENOMEM;
> > -
> > -pkt->buf_size = size;
> > -pkt->cl = (void *)client;
> 
> cmdq_pkt_create does not set the callback. Why doesn't that break things?
> Same holds for the crtc driver that is already in linux-next.

This series is to remove pkt->cl.
For the helper function whick need pkt->cl, add parameter to pass the cmdq_client information.
Up to now, only cmdq_pkt_finalize() use pkt->cl, but it is replaced by cmdq_pkt_eoc() and cmdq_pkt_jump_rel() in [PATCH v4 1/3].
So this would not break any thing.

Regards,
CK

> 
> Regards,
> Matthias
> 
> > -
> > -dev = client->chan->mbox->dev;
> > -dma_addr = dma_map_single(dev, pkt->va_base, pkt->buf_size,
> > -  DMA_TO_DEVICE);
> > -if (dma_mapping_error(dev, dma_addr)) {
> > -dev_err(dev, "dma map failed, size=%u\n", (u32)(u64)size);
> > -kfree(pkt->va_base);
> > -return -ENOMEM;
> > -}
> > -
> > -pkt->pa_base = dma_addr;
> > -
> > -return 0;
> > -}
> > -
> > -static void mdp_cmdq_pkt_destroy(struct cmdq_pkt *pkt)
> > -{
> > -struct cmdq_client *client = (struct cmdq_client *)pkt->cl;
> > -
> > -dma_unmap_single(client->chan->mbox->dev, pkt->pa_base, pkt->buf_size,
> > - DMA_TO_DEVICE);
> > -kfree(pkt->va_base);
> > -pkt->va_base = NULL;
> > -}
> > -
> >   static void mdp_auto_release_work(struct work_struct *work)
> >   {
> >   struct mdp_cmdq_cmd *cmd;
> > @@ -538,7 +501,7 @@ static void mdp_auto_release_work(struct work_struct *work)
> >   wake_up(&mdp->callback_wq);
> >   }
> >   
> > -mdp_cmdq_pkt_destroy(&cmd->pkt);
> > +cmdq_pkt_destroy(mdp->cmdq_clt[cmd->pp_idx], &cmd->pkt);
> >   kfree(cmd->comps);
> >   cmd->comps = NULL;
> >   kfree(cmd);
> > @@ -578,7 +541,7 @@ static void mdp_handle_cmdq_callback(struct mbox_client *cl, void *mssg)
> >   if (refcount_dec_and_test(&mdp->job_count))
> >   wake_up(&mdp->callback_wq);
> >   
> > -mdp_cmdq_pkt_destroy(&cmd->pkt);
> > +cmdq_pkt_destroy(mdp->cmdq_clt[cmd->pp_idx], &cmd->pkt);
> >   kfree(cmd->comps);
> >   cmd->comps = NULL;
> >   kfree(cmd);
> > @@ -620,7 +583,7 @@ static struct mdp_cmdq_cmd *mdp_cmdq_prepare(struct mdp_dev *mdp,
> >   goto err_uninit;
> >   }
> >   
> > -ret = mdp_cmdq_pkt_create(mdp->cmdq_clt[pp_idx], &cmd->pkt, SZ_16K);
> > +ret = cmdq_pkt_create(mdp->cmdq_clt[pp_idx], &cmd->pkt, SZ_16K);
> >   if (ret)
> >   goto err_free_cmd;
> >   
> > @@ -700,6 +663,7 @@ static struct mdp_cmdq_cmd *mdp_cmdq_prepare(struct mdp_dev *mdp,
> >   cmd->comps = comps;
> >   cmd->num_comps = num_comp;
> >   cmd->mdp_ctx = param->mdp_ctx;
> > +cmd->pp_idx = pp_idx;
> >   
> >   kfree(path);
> >   return cmd;
> > @@ -711,7 +675,7 @@ static struct mdp_cmdq_cmd *mdp_cmdq_prepare(struct mdp_dev *mdp,
> >   err_free_comps:
> >   kfree(comps);
> >   err_destroy_pkt:
> > -mdp_cmdq_pkt_destroy(&cmd->pkt);
> > +cmdq_pkt_destroy(mdp->cmdq_clt[pp_idx], &cmd->pkt);
> >   err_free_cmd:
> >   kfree(cmd);
> >   err_uninit:
> > diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.h b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.h
> > index 53a30ad7e0b0..935ae9825728 100644
> > --- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.h
> > +++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.h
> > @@ -35,6 +35,7 @@ struct mdp_cmdq_cmd {
> >   struct mdp_comp *comps;
> >   void *mdp_ctx;
> >   u8 num_comps;
> > +u8 pp_idx;
> >   };
> >   
> >   struct mdp_dev;