linux-kernel - Re: [PATCH v2 1/1] scsi: ufs: core: Make UFS_MCQ_NUM_DEV_CMD

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Message-ID: <623ced08cabcb92763f75f13cd9a6c67d8b10fc6.camel@mediatek.com>
Date:   Tue, 30 May 2023 10:04:21 +0000
From:   Powen Kao (高伯文) <Powen.Kao@...iatek.com>
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        "linux-mediatek@...ts.infradead.org" 
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CC:     Peter Wang (王信友) 
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        Eddie Huang (黃智傑) 
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        Naomi Chu (朱詠田) <Naomi.Chu@...iatek.com>,
        Stanley Chu (朱原陞) 
        <stanley.chu@...iatek.com>
Subject: Re: [PATCH v2 1/1] scsi: ufs: core: Make UFS_MCQ_NUM_DEV_CMD_QUEUES a
 module parameter

On Tue, 2023-05-30 at 09:24 +0200, AngeloGioacchino Del Regno wrote:
> 
> I imagine that MediaTek's UFS IP does not support dev_cmd_queues=1,
> does it?
> 
> In that case, this should not be a UFS module parameter, but a
> setting that
> you provide from ufs-mediatek instead.
> 
> Regards,
> Angelo

Hi Angelo

Our IP do work with dev_cmd_queues=1, but sacrifice one hwq
specifically for dev commands leaving (N-1) hwq to (N) CPUs for
submission doesn't make much sense.

Actually I would prefer making it a dts property than module parameter,
however, to match convention like `poll_queues` module parameters is
chosen.

Po-Wen