From: Michael Schmitz <schmitzmic@gmail.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Arnd Bergmann <arnd@kernel.org>,
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>,
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@v>
Subject: Re: [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO_BUS
Date: Fri, 1 Jul 2022 07:21:53 +1200 [thread overview]
Message-ID: <c1d245ae-54c3-ec2b-e975-d50f9a863d2b@gmail.com> (raw)
In-Reply-To: <YrvvfpW4MmQiM47H@infradead.org>
Hi Christoph,
On 29/06/22 18:21, Christoph Hellwig wrote:
> On Wed, Jun 29, 2022 at 11:09:00AM +1200, Michael Schmitz wrote:
>> And all SCSI buffers are allocated using kmalloc? No way at all for user
>> space to pass unaligned data?
> Most that you will see actually comes from the page allocator. But
> the block layer has a dma_alignment limit, and when userspace sends
> I/O that is not properly aligned it will be bounce buffered before
> it it sent to the driver.
That limit is set to L1_CACHE_BYTES on m68k so we're good here.
Thanks,
Michael
WARNING: multiple messages have this Message-ID (diff)
From: Michael Schmitz <schmitzmic@gmail.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Arnd Bergmann <arnd@kernel.org>,
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>,
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: Fri, 1 Jul 2022 07:21:53 +1200 [thread overview]
Message-ID: <c1d245ae-54c3-ec2b-e975-d50f9a863d2b@gmail.com> (raw)
In-Reply-To: <YrvvfpW4MmQiM47H@infradead.org>
Hi Christoph,
On 29/06/22 18:21, Christoph Hellwig wrote:
> On Wed, Jun 29, 2022 at 11:09:00AM +1200, Michael Schmitz wrote:
>> And all SCSI buffers are allocated using kmalloc? No way at all for user
>> space to pass unaligned data?
> Most that you will see actually comes from the page allocator. But
> the block layer has a dma_alignment limit, and when userspace sends
> I/O that is not properly aligned it will be bounce buffered before
> it it sent to the driver.
That limit is set to L1_CACHE_BYTES on m68k so we're good here.
Thanks,
Michael
WARNING: multiple messages have this Message-ID (diff)
From: Michael Schmitz <schmitzmic@gmail.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Linux-Arch <linux-arch@vger.kernel.org>,
scsi <linux-scsi@vger.kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Jakub Kicinski <kuba@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Miquel van Smoorenburg <mikevs@xs4all.net>,
Denis Efremov <efremov@linux.com>,
linux-m68k <linux-m68k@lists.linux-m68k.org>,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
Khalid Aziz <khalid@gonehiking.org>,
Arnd Bergmann <arnd@kernel.org>,
Parisc List <linux-parisc@vger.kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Matt Wang <wwentao@vmware.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Mark Salyzyn <salyzyn@android.com>,
Linux IOMMU <iommu@lists.linux-foundation.org>,
alpha <linux-alpha@vger.kernel.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
"Maciej W . Rozycki" <macro@orcam.me.uk>
Subject: Re: [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO_BUS
Date: Fri, 1 Jul 2022 07:21:53 +1200 [thread overview]
Message-ID: <c1d245ae-54c3-ec2b-e975-d50f9a863d2b@gmail.com> (raw)
In-Reply-To: <YrvvfpW4MmQiM47H@infradead.org>
Hi Christoph,
On 29/06/22 18:21, Christoph Hellwig wrote:
> On Wed, Jun 29, 2022 at 11:09:00AM +1200, Michael Schmitz wrote:
>> And all SCSI buffers are allocated using kmalloc? No way at all for user
>> space to pass unaligned data?
> Most that you will see actually comes from the page allocator. But
> the block layer has a dma_alignment limit, and when userspace sends
> I/O that is not properly aligned it will be bounce buffered before
> it it sent to the driver.
That limit is set to L1_CACHE_BYTES on m68k so we're good here.
Thanks,
Michael
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
WARNING: multiple messages have this Message-ID (diff)
From: Michael Schmitz <schmitzmic@gmail.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
Linux-Arch <linux-arch@vger.kernel.org>,
scsi <linux-scsi@vger.kernel.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Jakub Kicinski <kuba@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Miquel van Smoorenburg <mikevs@xs4all.net>,
Denis Efremov <efremov@linux.com>,
linux-m68k <linux-m68k@lists.linux-m68k.org>,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
Khalid Aziz <khalid@gonehiking.org>,
Arnd Bergmann <arnd@kernel.org>,
Parisc List <linux-parisc@vger.kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Matt Wang <wwentao@vmware.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Mark Salyzyn <salyzyn@android.com>,
Linux IOMMU <iommu@lists.linux-foundation.org>,
alpha <linux-alpha@vger.kernel.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
"Maciej W . Rozycki" <macro@orcam.me.uk>
Subject: Re: [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO_BUS
Date: Fri, 1 Jul 2022 07:21:53 +1200 [thread overview]
Message-ID: <c1d245ae-54c3-ec2b-e975-d50f9a863d2b@gmail.com> (raw)
In-Reply-To: <YrvvfpW4MmQiM47H@infradead.org>
Hi Christoph,
On 29/06/22 18:21, Christoph Hellwig wrote:
> On Wed, Jun 29, 2022 at 11:09:00AM +1200, Michael Schmitz wrote:
>> And all SCSI buffers are allocated using kmalloc? No way at all for user
>> space to pass unaligned data?
> Most that you will see actually comes from the page allocator. But
> the block layer has a dma_alignment limit, and when userspace sends
> I/O that is not properly aligned it will be bounce buffered before
> it it sent to the driver.
That limit is set to L1_CACHE_BYTES on m68k so we're good here.
Thanks,
Michael
next prev parent reply other threads:[~2022-06-30 19:21 UTC|newest]
Thread overview: 138+ 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 ` Arnd Bergmann
2022-06-17 12:57 ` Arnd Bergmann
2022-06-17 12:57 ` [PATCH v2 1/3] scsi: dpt_i2o: drop stale VIRT_TO_BUS dependency Arnd Bergmann
2022-06-17 12:57 ` Arnd Bergmann
2022-06-17 12:57 ` Arnd Bergmann
2022-06-21 8:43 ` Hannes Reinecke
2022-06-21 8:43 ` Hannes Reinecke
2022-06-21 8:43 ` Hannes Reinecke
[not found] ` <20220617125750.728590-1-arnd-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2022-06-17 12:57 ` [PATCH v2 2/3] scsi: BusLogic remove bus_to_virt Arnd Bergmann
2022-06-17 12:57 ` Arnd Bergmann
2022-06-17 12:57 ` Arnd Bergmann
2022-06-17 12:57 ` Arnd Bergmann
2022-06-17 14:02 ` Robin Murphy
2022-06-17 14:02 ` Robin Murphy
2022-06-17 14:02 ` Robin Murphy
2022-06-21 8:45 ` Hannes Reinecke
2022-06-21 8:45 ` Hannes Reinecke
2022-06-21 8:45 ` Hannes Reinecke
2022-06-21 21:56 ` Khalid Aziz
2022-06-21 21:56 ` Khalid Aziz
2022-06-21 21:56 ` Khalid Aziz
2022-06-23 14:47 ` Arnd Bergmann
2022-06-23 14:47 ` Arnd Bergmann
2022-06-23 14:47 ` Arnd Bergmann
2022-06-24 15:38 ` Khalid Aziz
2022-06-24 15:38 ` Khalid Aziz
2022-06-24 15:38 ` Khalid Aziz
2022-06-24 15:43 ` Arnd Bergmann
2022-06-24 15:43 ` Arnd Bergmann
2022-06-24 15:43 ` Arnd Bergmann
2022-06-17 12:57 ` [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO_BUS Arnd Bergmann
2022-06-17 12:57 ` Arnd Bergmann
2022-06-17 12:57 ` Arnd Bergmann
2022-06-17 12:57 ` Arnd Bergmann
2022-06-18 1:06 ` Michael Schmitz
2022-06-18 1:06 ` Michael Schmitz
2022-06-18 1:06 ` Michael Schmitz
[not found] ` <6ba86afe-bf9f-1aca-7af1-d0d348d75ffc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2022-06-24 9:10 ` Arnd Bergmann
2022-06-24 9:10 ` Arnd Bergmann
2022-06-24 9:10 ` Arnd Bergmann
2022-06-24 9:10 ` Arnd Bergmann
2022-06-26 5:21 ` Michael Schmitz
2022-06-26 5:21 ` Michael Schmitz
2022-06-26 5:21 ` Michael Schmitz
2022-06-26 5:21 ` Michael Schmitz
2022-06-26 8:36 ` Arnd Bergmann
2022-06-26 8:36 ` Arnd Bergmann
2022-06-26 8:36 ` Arnd Bergmann
2022-06-26 8:36 ` Arnd Bergmann
2022-06-27 8:09 ` Michael Schmitz
2022-06-27 8:09 ` Michael Schmitz
2022-06-27 8:09 ` Michael Schmitz
2022-06-27 8:09 ` Michael Schmitz
2022-06-27 8:26 ` Geert Uytterhoeven
2022-06-27 8:26 ` Geert Uytterhoeven
2022-06-27 8:26 ` Geert Uytterhoeven
2022-06-27 8:26 ` Geert Uytterhoeven
2022-06-27 21:12 ` Michael Schmitz
2022-06-27 21:12 ` Michael Schmitz
2022-06-27 21:12 ` Michael Schmitz
2022-06-27 21:12 ` Michael Schmitz
[not found] ` <b4e5a1c9-e375-63fb-ec7c-abb7384a6d59-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2022-06-28 3:25 ` Michael Schmitz
2022-06-28 3:25 ` Michael Schmitz
2022-06-28 3:25 ` Michael Schmitz
2022-06-28 3:25 ` Michael Schmitz
[not found] ` <9289fd82-285c-035f-5355-4d70ce4f87b0-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2022-06-28 7:03 ` Geert Uytterhoeven
2022-06-28 7:03 ` Geert Uytterhoeven
2022-06-28 7:03 ` Geert Uytterhoeven
2022-06-28 7:03 ` Geert Uytterhoeven
2022-06-28 21:03 ` Michael Schmitz
2022-06-28 21:03 ` Michael Schmitz
2022-06-28 21:03 ` Michael Schmitz
2022-06-28 21:03 ` Michael Schmitz
2022-06-28 21:50 ` Arnd Bergmann
2022-06-28 21:50 ` Arnd Bergmann
2022-06-28 21:50 ` Arnd Bergmann
2022-06-28 21:50 ` Arnd Bergmann
2022-06-28 23:09 ` Michael Schmitz
2022-06-28 23:09 ` Michael Schmitz
2022-06-28 23:09 ` Michael Schmitz
2022-06-28 23:09 ` Michael Schmitz
2022-06-28 23:50 ` Bart Van Assche
2022-06-28 23:50 ` Bart Van Assche
2022-06-28 23:50 ` Bart Van Assche
2022-06-28 23:50 ` Bart Van Assche
2022-06-29 0:01 ` Michael Schmitz
2022-06-29 0:01 ` Michael Schmitz
2022-06-29 0:01 ` Michael Schmitz
2022-06-29 0:01 ` Michael Schmitz
2022-06-29 0:14 ` Michael Schmitz
2022-06-29 0:14 ` Michael Schmitz
2022-06-29 0:14 ` Michael Schmitz
2022-06-29 0:14 ` Michael Schmitz
2022-06-29 6:21 ` Christoph Hellwig
2022-06-29 6:21 ` Christoph Hellwig
2022-06-29 6:21 ` Christoph Hellwig
2022-06-29 6:21 ` Christoph Hellwig
2022-06-30 19:21 ` Michael Schmitz [this message]
2022-06-30 19:21 ` Michael Schmitz
2022-06-30 19:21 ` Michael Schmitz
2022-06-30 19:21 ` Michael Schmitz
2022-06-30 8:04 ` David Laight
2022-06-30 8:04 ` David Laight
2022-06-30 8:04 ` David Laight
2022-06-30 8:04 ` David Laight
[not found] ` <26852797d822462abc1c9f96def7fa42-1XygrNkDbNvwg4NCKwmqgw@public.gmane.org>
2022-06-30 9:40 ` Christophe Leroy
2022-06-30 9:40 ` Christophe Leroy
2022-06-30 9:40 ` Christophe Leroy
2022-06-30 9:40 ` Christophe Leroy
[not found] ` <a36a85a3-3fd3-10ac-cac3-09a90eaf1936-2tlSp11Fh4xulxpn9UvDqw@public.gmane.org>
2022-06-30 10:32 ` David Laight
2022-06-30 10:32 ` David Laight
2022-06-30 10:32 ` David Laight
2022-06-30 10:32 ` David Laight
2022-06-28 7:08 ` Arnd Bergmann
2022-06-28 7:08 ` Arnd Bergmann
2022-06-28 7:08 ` Arnd Bergmann
2022-06-28 7:08 ` Arnd Bergmann
2022-06-28 21:38 ` Michael Schmitz
2022-06-28 21:38 ` Michael Schmitz
2022-06-28 21:38 ` Michael Schmitz
2022-06-28 21:38 ` Michael Schmitz
2022-06-28 21:55 ` Arnd Bergmann
2022-06-28 21:55 ` Arnd Bergmann
2022-06-28 21:55 ` Arnd Bergmann
2022-06-28 21:55 ` Arnd Bergmann
2022-06-28 23:43 ` Michael Schmitz
2022-06-28 23:43 ` Michael Schmitz
2022-06-28 23:43 ` Michael Schmitz
2022-06-28 23:43 ` Michael Schmitz
2022-06-29 6:25 ` Christoph Hellwig
2022-06-29 6:25 ` Christoph Hellwig
2022-06-29 6:25 ` Christoph Hellwig
2022-06-29 6:25 ` Christoph Hellwig
2022-06-30 19:26 ` Michael Schmitz
2022-06-30 19:26 ` Michael Schmitz
2022-06-30 19:26 ` Michael Schmitz
2022-06-30 19:26 ` Michael Schmitz
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