linux-kernel - Re: [PATCH 08/15] soc: mediatek: Add cmdq_pkt_finalize

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Message-ID: <aab601e8-232d-4e6b-9dae-593632c71983@linaro.org>
Date:   Mon, 25 Sep 2023 08:40:30 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>,
        "jassisinghbrar@...il.com" <jassisinghbrar@...il.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Singo Chang (張興國) 
        <Singo.Chang@...iatek.com>,
        Johnson Wang (王聖鑫) 
        <Johnson.Wang@...iatek.com>,
        Jason-ch Chen (陳建豪) 
        <Jason-ch.Chen@...iatek.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Shawn Sung (宋孝謙) 
        <Shawn.Sung@...iatek.com>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Elvis Wang (王军) <Elvis.Wang@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH 08/15] soc: mediatek: Add cmdq_pkt_finalize_loop to CMDQ
 driver

On 25/09/2023 08:04, Jason-JH Lin (林睿祥) wrote:
> Hi Krzysztof,
> 
> Thanks for the reviews.
> 
> On Sat, 2023-09-23 at 20:08 +0200, Krzysztof Kozlowski wrote:
>>  	 
>> External email : Please do not click links or open attachments until
>> you have verified the sender or the content.
>>  On 18/09/2023 21:21, Jason-JH.Lin wrote:
>>> Add cmdq_pkt_finalize_loop to CMDQ driver.
>>>
>>> cmdq_pkt_finalize_loop appends end of command(EOC) instruction and
>>> jump to start of command buffer instruction to make the command
>>> buffer loopable.
>>>
>>> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
>>> ---
>>>  drivers/soc/mediatek/mtk-cmdq-helper.c | 23
>> +++++++++++++++++++++++
>>>  include/linux/soc/mediatek/mtk-cmdq.h  |  8 ++++++++
>>>  2 files changed, 31 insertions(+)
>>>
>>> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c
>> b/drivers/soc/mediatek/mtk-cmdq-helper.c
>>> index 4be2a18a4a02..bbb127620bb3 100644
>>> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
>>> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
>>> @@ -475,6 +475,29 @@ int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>>>  }
>>>  EXPORT_SYMBOL(cmdq_pkt_finalize);
>>>  
>>> +int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt)
>>> +{
>>> +struct cmdq_instruction inst = { {0} };
>>> +int err;
>>> +
>>> +/* insert EOC and generate IRQ for each command iteration */
>>> +inst.op = CMDQ_CODE_EOC;
>>> +inst.value = CMDQ_EOC_IRQ_EN;
>>> +err = cmdq_pkt_append_command(pkt, inst);
>>> +if (err < 0)
>>> +return err;
>>> +
>>> +/* JUMP to start of pkt */
>>> +err = cmdq_pkt_jump(pkt, pkt->pa_base);
>>> +if (err < 0)
>>> +return err;
>>> +
>>> +pkt->loop = true;
>>> +
>>> +return err;
>>> +}
>>> +EXPORT_SYMBOL(cmdq_pkt_finalize_loop);
>>
>> NAK. No users (and please carefully think before you answer that your
>> other patch uses it).
>>
> 
> As I know, the API with EXPORT_SYMBOL means it can be used by a dynamic
> loaded module.
> 
> Do you means that mtk-cmdq-sec-mailbox.c in [PATCH 10/15] is a built-in 
> module currently, so I should not add EXPORT_SYMBOL to this API?

I mean there is no need for this. Please name the name of module where
this function will be defined and name of module(s) using it. ".c" is
not a module. ".ko" is.


Best regards,
Krzysztof