linux-kernel - Re: [PATCHv2 1/7] block: check for valid bio while splitting

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Message-ID: <279bdc31-ee29-4156-ab5b-9592e8297ebb@acm.org>
Date: Wed, 13 Aug 2025 16:17:49 -0700
From: Bart Van Assche <bvanassche@....org>
To: Keith Busch <kbusch@...nel.org>
Cc: Keith Busch <kbusch@...a.com>, linux-block@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
 snitzer@...nel.org, axboe@...nel.dk, dw@...idwei.uk, brauner@...nel.org,
 Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCHv2 1/7] block: check for valid bio while splitting

On 8/13/25 2:01 PM, Keith Busch wrote:
> I'm using the AHCI driver. It looks like ata_scsi_dev_config() overrides
> the dma_alignment to sector_size - 1, and that pattern goes way back,
> almost 20 years ago, so maybe I can't change it.

 From an AHCI specification
(https://www.intel.com/content/dam/www/public/us/en/documents/technical-specifications/serial-ata-ahci-spec-rev1-3-1.pdf):
"Data Base Address (DBA): Indicates the 32-bit physical address of the 
data block. The block must be word aligned, indicated by bit 0 being 
reserved."

Please note that I have no experience with programming AHCI controllers.

Bart.