linux-kernel - Re: [PATCH 4/5] soc: mediatek: mtk-cmdq: Add cmdq_pkt_acquire

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Date: Tue, 5 Mar 2024 01:41:21 +0000
From: Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>
To: "jassisinghbrar@...il.com" <jassisinghbrar@...il.com>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>, "chunkuang.hu@...nel.org"
	<chunkuang.hu@...nel.org>
CC: "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	Singo Chang (張興國) <Singo.Chang@...iatek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jason-ch Chen (陳建豪)
	<Jason-ch.Chen@...iatek.com>, Shawn Sung (宋孝謙)
	<Shawn.Sung@...iatek.com>, Nancy Lin (林欣螢)
	<Nancy.Lin@...iatek.com>, Project_Global_Chrome_Upstream_Group
	<Project_Global_Chrome_Upstream_Group@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 4/5] soc: mediatek: mtk-cmdq: Add cmdq_pkt_acquire_event()
 function

Hi Angelo,

Thanks for the reviews.

On Mon, 2024-03-04 at 11:05 +0100, AngeloGioacchino Del Regno wrote:
> Il 01/03/24 12:11, Jason-JH.Lin ha scritto:
> > Add cmdq_pkt_acquire_event() function to support CMDQ user making
> > an instruction for acquiring event.
> > 
> > CMDQ users can use cmdq_pkt_acquire_event() and
> > cmdq_pkt_clear_event()
> > to acquire GCE event and release GCE event and achieve the
> > MUTEX_LOCK
> > protection between GCE threads.
> > 
> > Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> > Change-Id: Icdae6b60345c7ec1d7541ac76d1f06da56959cde
> 
> Drop Change-Id please.

OK, I'll drop it.

> 
> > ---
> >   drivers/soc/mediatek/mtk-cmdq-helper.c | 15 +++++++++++++++
> >   include/linux/soc/mediatek/mtk-cmdq.h  |  9 +++++++++
> >   2 files changed, 24 insertions(+)
> > 
> > diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > index 2e9fc9bb1183..0183b40a0eff 100644
> > --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > @@ -342,6 +342,21 @@ int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16
> > event, bool clear)
> >   }
> >   EXPORT_SYMBOL(cmdq_pkt_wfe);
> >   
> > +int cmdq_pkt_acquire_event(struct cmdq_pkt *pkt, u16 event)
> > +{
> > +	struct cmdq_instruction inst = {};
> > +
> > +	if (event >= CMDQ_MAX_EVENT)
> > +		return -EINVAL;
> > +
> > +	inst.op = CMDQ_CODE_WFE;
> > +	inst.value = CMDQ_WFE_UPDATE | CMDQ_WFE_UPDATE_VALUE |
> > CMDQ_WFE_WAIT;
> > +	inst.event = event;
> > +
> > +	return cmdq_pkt_append_command(pkt, inst);
> > +}
> > +EXPORT_SYMBOL(cmdq_pkt_acquire_event);
> > +
> >   int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event)
> >   {
> >   	struct cmdq_instruction inst = { {0} };
> > diff --git a/include/linux/soc/mediatek/mtk-cmdq.h
> > b/include/linux/soc/mediatek/mtk-cmdq.h
> > index 2fe9be240fbc..de93c0a8e8a9 100644
> > --- a/include/linux/soc/mediatek/mtk-cmdq.h
> > +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> > @@ -202,6 +202,15 @@ int cmdq_pkt_mem_move(struct cmdq_pkt *pkt,
> > dma_addr_t src_addr, dma_addr_t dst_
> >    */
> >   int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event, bool clear);
> >   
> > +/**
> > + * cmdq_pkt_acquire_event() - append acquire event command to the
> > CMDQ packet
> > + * @pkt:	the CMDQ packet
> > + * @event:	the desired event to be acquired
> 
> What you wrote in the commit message is good documentation for this
> function,
> please also put it here in kerneldoc format as a documentation
> paragraph.
> 
OK, I'll put it in kerneldoc, too.

Regards,
Jason-JH.Lin

> > + *
> > + * Return: 0 for success; else the error code is returned
> > + */
> > +int cmdq_pkt_acquire_event(struct cmdq_pkt *pkt, u16 event);
> > +
> >   /**
> >    * cmdq_pkt_clear_event() - append clear event command to the
> > CMDQ packet
> >    * @pkt:	the CMDQ packet
> 
>