From: Eric Biggers <ebiggers@kernel.org>
To: Keith Busch <kbusch@fb.com>
Cc: linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org,
axboe@kernel.dk, Kernel Team <Kernel-team@fb.com>,
hch@lst.de, bvanassche@acm.org, damien.lemoal@opensource.wdc.com,
pankydev8@gmail.com, Keith Busch <kbusch@kernel.org>,
Johannes Thumshirn <johannes.thumshirn@wdc.com>
Subject: Re: [PATCHv4 3/9] block: export dma_alignment attribute
Date: Thu, 26 May 2022 00:30:52 -0700 [thread overview]
Message-ID: <Yo8srMJEWkr3JIhe@sol.localdomain> (raw)
In-Reply-To: <20220526010613.4016118-4-kbusch@fb.com>
On Wed, May 25, 2022 at 06:06:07PM -0700, Keith Busch wrote:
> From: Keith Busch <kbusch@kernel.org>
>
> User space may want to know how to align their buffers to avoid
> bouncing. Export the queue attribute.
>
> Signed-off-by: Keith Busch <kbusch@kernel.org>
> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> ---
> Documentation/ABI/stable/sysfs-block | 9 +++++++++
> block/blk-sysfs.c | 7 +++++++
> 2 files changed, 16 insertions(+)
>
> diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block
> index e8797cd09aff..08f6d00df138 100644
> --- a/Documentation/ABI/stable/sysfs-block
> +++ b/Documentation/ABI/stable/sysfs-block
> @@ -142,6 +142,15 @@ Description:
> Default value of this file is '1'(on).
>
>
> +What: /sys/block/<disk>/queue/dma_alignment
> +Date: May 2022
> +Contact: linux-block@vger.kernel.org
> +Description:
> + Reports the alignment that user space addresses must have to be
> + used for raw block device access with O_DIRECT and other driver
> + specific passthrough mechanisms.
> +
Please keep this file in alphabetical order.
- Eric
next prev parent reply other threads:[~2022-05-26 7:31 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-26 1:06 [PATCHv4 0/9] direct io dma alignment Keith Busch
2022-05-26 1:06 ` [PATCHv4 1/9] block: fix infiniate loop for invalid zone append Keith Busch
2022-05-26 1:48 ` Damien Le Moal
2022-05-31 6:19 ` Christoph Hellwig
2022-05-26 1:06 ` [PATCHv4 2/9] block/bio: remove duplicate append pages code Keith Busch
2022-05-26 1:06 ` [PATCHv4 3/9] block: export dma_alignment attribute Keith Busch
2022-05-26 7:30 ` Eric Biggers [this message]
2022-05-26 1:06 ` [PATCHv4 4/9] block: introduce bdev_dma_alignment helper Keith Busch
2022-05-26 1:06 ` [PATCHv4 5/9] block: add a helper function for dio alignment Keith Busch
2022-05-26 1:54 ` Damien Le Moal
2022-05-31 6:22 ` Christoph Hellwig
2022-05-26 1:06 ` [PATCHv4 6/9] block/merge: count bytes instead of sectors Keith Busch
2022-05-26 1:57 ` Damien Le Moal
2022-05-31 6:25 ` Christoph Hellwig
2022-05-26 1:06 ` [PATCHv4 7/9] block/bounce: " Keith Busch
2022-05-26 1:58 ` Damien Le Moal
2022-05-30 15:08 ` Pankaj Raghav
2022-05-31 6:26 ` Christoph Hellwig
2022-05-26 1:06 ` [PATCHv4 8/9] block: relax direct io memory alignment Keith Busch
2022-05-26 2:03 ` Damien Le Moal
2022-05-26 7:29 ` Eric Biggers
2022-05-26 13:50 ` Keith Busch
2022-05-26 18:13 ` Eric Biggers
2022-05-26 18:55 ` Keith Busch
2022-05-26 20:32 ` Keith Busch
2022-05-31 6:30 ` Christoph Hellwig
2022-05-26 1:06 ` [PATCHv4 9/9] fs: add support for dma aligned direct-io Keith Busch
2022-05-26 2:01 ` Damien Le Moal
2022-05-31 6:29 ` Christoph Hellwig
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