linux-kernel - Re: [PATCH 4.19 240/321] mmc: core: align max segment size with logical block size

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Message-ID: <20191205222247.GC25107@duo.ucw.cz>
Date:   Thu, 5 Dec 2019 23:22:47 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Christoph Hellwig <hch@....de>, Faiz Abbas <faiz_abbas@...com>,
        linux-block@...r.kernel.org, Ming Lei <ming.lei@...hat.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 240/321] mmc: core: align max segment size with
 logical block size

Hi!

> From: Ming Lei <ming.lei@...hat.com>
> 
> [ Upstream commit c53336c8f5f29043fded57912cc06c24e12613d7 ]
> 
> Logical block size is the lowest possible block size that the storage
> device can address. Max segment size is often related with controller's
> DMA capability. And it is reasonable to align max segment size with
> logical block size.

> SDHCI sets un-aligned max segment size, and causes ADMA error, so
> fix it by aligning max segment size with logical block size.

If un-aligned max segment sizes are problem, should we add checks to
prevent setting them?

At least these set unaligned problems; is that a problem?

drivers/block/nbd.c:	blk_queue_max_segment_size(disk->queue, UINT_MAX);
drivers/block/virtio_blk.c:		blk_queue_max_segment_size(q, -1U);
drivers/block/rbd.c:	blk_queue_max_segment_size(q, UINT_MAX);

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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