From: Michael Schmitz <schmitzmic@gmail.com>
To: Bart Van Assche <bvanassche@acm.org>, Arnd Bergmann <arnd@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
scsi <linux-scsi@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Arnd Bergmann <arnd@arndb.de>, Jakub Kicinski <kuba@kernel.org>,
Christoph Hellwig <hch@infradead.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Robin Murphy <robin.murphy@arm.com>,
Linux IOMMU <iommu@lists.linux-foundation.org>,
Khalid Aziz <khalid@gonehiking.org>,
"Maciej W . Rozycki" <macro@orcam.me.uk>,
Matt Wang <wwentao@vmware.com>,
Miquel van Smoorenburg <mikevs@xs4all.net>,
Mark Salyzyn <salyzyn@android.com>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
Linux-Arch <linux-arch@vger.kernel.org>,
alpha <linux-alpha@vger.kernel.org>,
linux-m68k <linux-m68k@lists.linux-m68k.org>,
Parisc List <linux-parisc@vger.kernel.org>,
Denis Efremov <efremov@linux.com>,
Michael Ellerman <mpe@ellerman.id.au>,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Subject: Re: [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO_BUS
Date: Wed, 29 Jun 2022 12:14:42 +1200 [thread overview]
Message-ID: <2402062b-aae6-a247-06a8-3775c2909bdb@gmail.com> (raw)
In-Reply-To: <859c2adc-d3cb-64e8-faba-06e1ac5eddaf@gmail.com>
Hi Bart,
On 29/06/22 12:01, Michael Schmitz wrote:
>
>> An example of a user space application that passes an SG I/O data
>> buffer to the kernel that is aligned to a four byte boundary but not
>> to an eight byte boundary if the -s (scattered) command line option
>> is used:
>> https://github.com/osandov/blktests/blob/master/src/discontiguous-io.cpp
>
> Thanks - four byte alignment actually wouldn't be an issue for me.
> It's two byte or smaller that would trip up the SCSI DMA.
>
> While I'm sure such an even more pathological test case could be
> written, I was rather worried about st.c and sr.c input ...
Nevermind - I just see m68k defines ARCH_DMA_MINALIGN to be four bytes.
Should be safe for all that matters, then.
Cheers,
Michael
next prev parent reply other threads:[~2022-06-29 0:14 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-17 12:57 [PATCH v2 0/3] phase out CONFIG_VIRT_TO_BUS Arnd Bergmann
2022-06-17 12:57 ` [PATCH v2 1/3] scsi: dpt_i2o: drop stale VIRT_TO_BUS dependency Arnd Bergmann
2022-06-21 8:43 ` Hannes Reinecke
2022-06-17 12:57 ` [PATCH v2 2/3] scsi: BusLogic remove bus_to_virt Arnd Bergmann
2022-06-17 14:02 ` Robin Murphy
2022-06-21 8:45 ` Hannes Reinecke
2022-06-21 21:56 ` Khalid Aziz
2022-06-23 14:47 ` Arnd Bergmann
2022-06-24 15:38 ` Khalid Aziz
2022-06-24 15:43 ` Arnd Bergmann
2022-06-17 12:57 ` [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO_BUS Arnd Bergmann
2022-06-18 1:06 ` Michael Schmitz
2022-06-24 9:10 ` Arnd Bergmann
2022-06-26 5:21 ` Michael Schmitz
2022-06-26 8:36 ` Arnd Bergmann
2022-06-27 8:09 ` Michael Schmitz
2022-06-27 8:26 ` Geert Uytterhoeven
2022-06-27 21:12 ` Michael Schmitz
2022-06-28 3:25 ` Michael Schmitz
2022-06-28 7:03 ` Geert Uytterhoeven
2022-06-28 21:03 ` Michael Schmitz
2022-06-28 21:50 ` Arnd Bergmann
2022-06-28 23:09 ` Michael Schmitz
2022-06-28 23:50 ` Bart Van Assche
2022-06-29 0:01 ` Michael Schmitz
2022-06-29 0:14 ` Michael Schmitz [this message]
2022-06-29 6:21 ` Christoph Hellwig
2022-06-30 19:21 ` Michael Schmitz
2022-06-30 8:04 ` David Laight
2022-06-30 9:40 ` Christophe Leroy
2022-06-30 10:32 ` David Laight
2022-06-28 7:08 ` Arnd Bergmann
2022-06-28 21:38 ` Michael Schmitz
2022-06-28 21:55 ` Arnd Bergmann
2022-06-28 23:43 ` Michael Schmitz
2022-06-29 6:25 ` Christoph Hellwig
2022-06-30 19:26 ` Michael Schmitz
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