From: 'Joerg Roedel' <joro@8bytes.org>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: 'KyongHo Cho' <pullip.cho@samsung.com>,
linux-arm-kernel@lists.infradead.org,
linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org,
linux-arch@vger.kernel.org,
'Kyungmin Park' <kyungmin.park@samsung.com>,
'Russell King - ARM Linux' <linux@arm.linux.org.uk>,
'Arnd Bergmann' <arnd@arndb.de>
Subject: Re: [Linaro-mm-sig] [PATCH 3/8] ARM: dma-mapping: use asm-generic/dma-mapping-common.h
Date: Fri, 24 Jun 2011 10:39:09 +0200 [thread overview]
Message-ID: <20110624083909.GB29299@8bytes.org> (raw)
In-Reply-To: <002501cc3008$f000d600$d0028200$%szyprowski@samsung.com>
On Tue, Jun 21, 2011 at 01:47:03PM +0200, Marek Szyprowski wrote:
> > I also think that it is better to attach and to detach dma_map_ops
> > dynamically.
>
> What's the point of such operations? Why do you want to change dma
> mapping methods in runtime?
That is dangerous. You have to make sure that there are no mappings
granted to the the device driver before changing the dma_ops of a device
at runtime. Otherwise existing mappings for a device may disappear and
confuse the driver and the device.
Joerg
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: 'Joerg Roedel' <joro@8bytes.org>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: 'KyongHo Cho' <pullip.cho@samsung.com>,
linux-arm-kernel@lists.infradead.org,
linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org,
linux-arch@vger.kernel.org,
'Kyungmin Park' <kyungmin.park@samsung.com>,
'Russell King - ARM Linux' <linux@arm.linux.org.uk>,
'Arnd Bergmann' <arnd@arndb.de>
Subject: Re: [Linaro-mm-sig] [PATCH 3/8] ARM: dma-mapping: use asm-generic/dma-mapping-common.h
Date: Fri, 24 Jun 2011 10:39:09 +0200 [thread overview]
Message-ID: <20110624083909.GB29299@8bytes.org> (raw)
Message-ID: <20110624083909.wNDGKeTDXS5GvmuOd1O7eGwypNBqiSF30sskY_Ufdps@z> (raw)
In-Reply-To: <002501cc3008$f000d600$d0028200$%szyprowski@samsung.com>
On Tue, Jun 21, 2011 at 01:47:03PM +0200, Marek Szyprowski wrote:
> > I also think that it is better to attach and to detach dma_map_ops
> > dynamically.
>
> What's the point of such operations? Why do you want to change dma
> mapping methods in runtime?
That is dangerous. You have to make sure that there are no mappings
granted to the the device driver before changing the dma_ops of a device
at runtime. Otherwise existing mappings for a device may disappear and
confuse the driver and the device.
Joerg
WARNING: multiple messages have this Message-ID (diff)
From: joro@8bytes.org ('Joerg Roedel')
To: linux-arm-kernel@lists.infradead.org
Subject: [Linaro-mm-sig] [PATCH 3/8] ARM: dma-mapping: use asm-generic/dma-mapping-common.h
Date: Fri, 24 Jun 2011 10:39:09 +0200 [thread overview]
Message-ID: <20110624083909.GB29299@8bytes.org> (raw)
In-Reply-To: <002501cc3008$f000d600$d0028200$%szyprowski@samsung.com>
On Tue, Jun 21, 2011 at 01:47:03PM +0200, Marek Szyprowski wrote:
> > I also think that it is better to attach and to detach dma_map_ops
> > dynamically.
>
> What's the point of such operations? Why do you want to change dma
> mapping methods in runtime?
That is dangerous. You have to make sure that there are no mappings
granted to the the device driver before changing the dma_ops of a device
at runtime. Otherwise existing mappings for a device may disappear and
confuse the driver and the device.
Joerg
next prev parent reply other threads:[~2011-06-24 8:39 UTC|newest]
Thread overview: 201+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-20 7:50 [PATCH/RFC 0/8] ARM: DMA-mapping framework redesign Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 7:50 ` [PATCH 1/8] ARM: dma-mapping: remove offset parameter to prepare for generic dma_ops Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 8:35 ` Michal Nazarewicz
2011-06-20 8:35 ` Michal Nazarewicz
2011-06-20 8:35 ` Michal Nazarewicz
2011-06-20 10:46 ` Marek Szyprowski
2011-06-20 10:46 ` Marek Szyprowski
2011-06-20 10:46 ` Marek Szyprowski
2011-07-03 15:28 ` Russell King - ARM Linux
2011-07-03 15:28 ` Russell King - ARM Linux
2011-07-03 15:28 ` Russell King - ARM Linux
2011-07-26 12:56 ` Marek Szyprowski
2011-07-26 12:56 ` Marek Szyprowski
2011-07-26 12:56 ` Marek Szyprowski
2011-06-20 7:50 ` [PATCH 2/8] ARM: dma-mapping: implement dma_map_single on top of dma_map_page Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 14:39 ` Russell King - ARM Linux
2011-06-20 14:39 ` Russell King - ARM Linux
2011-06-20 14:39 ` Russell King - ARM Linux
2011-06-20 15:15 ` Marek Szyprowski
2011-06-20 15:15 ` Marek Szyprowski
2011-06-20 15:15 ` Marek Szyprowski
2011-06-24 15:24 ` Arnd Bergmann
2011-06-24 15:24 ` Arnd Bergmann
2011-06-24 15:24 ` Arnd Bergmann
2011-06-27 14:29 ` Marek Szyprowski
2011-06-27 14:29 ` Marek Szyprowski
2011-06-27 14:29 ` Marek Szyprowski
2011-06-27 14:53 ` Arnd Bergmann
2011-06-27 14:53 ` Arnd Bergmann
2011-06-27 14:53 ` Arnd Bergmann
2011-06-27 15:06 ` Marek Szyprowski
2011-06-27 15:06 ` Marek Szyprowski
2011-06-27 15:06 ` Marek Szyprowski
2011-06-20 7:50 ` [PATCH 3/8] ARM: dma-mapping: use asm-generic/dma-mapping-common.h Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 14:33 ` [Linaro-mm-sig] " KyongHo Cho
2011-06-20 14:33 ` KyongHo Cho
2011-06-20 14:33 ` KyongHo Cho
2011-06-21 11:47 ` Marek Szyprowski
2011-06-21 11:47 ` Marek Szyprowski
2011-06-21 11:47 ` Marek Szyprowski
2011-06-24 8:39 ` 'Joerg Roedel' [this message]
2011-06-24 8:39 ` 'Joerg Roedel'
2011-06-24 8:39 ` 'Joerg Roedel'
2011-06-24 15:36 ` Arnd Bergmann
2011-06-24 15:36 ` Arnd Bergmann
2011-06-24 15:36 ` Arnd Bergmann
2011-06-24 15:36 ` Arnd Bergmann
2011-06-27 12:18 ` Marek Szyprowski
2011-06-27 12:18 ` Marek Szyprowski
2011-06-27 12:18 ` Marek Szyprowski
2011-06-27 13:19 ` Arnd Bergmann
2011-06-27 13:19 ` Arnd Bergmann
2011-06-27 13:19 ` Arnd Bergmann
2011-07-07 12:09 ` Lennert Buytenhek
2011-07-07 12:09 ` Lennert Buytenhek
2011-07-07 12:09 ` Lennert Buytenhek
2011-07-07 12:38 ` Russell King - ARM Linux
2011-07-07 12:38 ` Russell King - ARM Linux
2011-07-07 12:38 ` Russell King - ARM Linux
2011-07-15 0:10 ` Lennert Buytenhek
2011-07-15 0:10 ` Lennert Buytenhek
2011-07-15 0:10 ` Lennert Buytenhek
2011-07-15 9:27 ` Russell King - ARM Linux
2011-07-15 9:27 ` Russell King - ARM Linux
2011-07-15 9:27 ` Russell King - ARM Linux
2011-07-15 21:53 ` Lennert Buytenhek
2011-07-15 21:53 ` Lennert Buytenhek
2011-07-15 21:53 ` Lennert Buytenhek
2011-06-20 7:50 ` [PATCH 4/8] ARM: dma-mapping: implement dma sg methods on top of generic dma ops Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 14:37 ` KyongHo Cho
2011-06-20 14:37 ` KyongHo Cho
2011-06-20 14:37 ` KyongHo Cho
2011-06-20 14:40 ` Russell King - ARM Linux
2011-06-20 14:40 ` Russell King - ARM Linux
2011-06-20 14:40 ` Russell King - ARM Linux
2011-06-20 15:23 ` Marek Szyprowski
2011-06-20 15:23 ` Marek Szyprowski
2011-06-20 15:23 ` Marek Szyprowski
2011-06-20 7:50 ` [PATCH 5/8] ARM: dma-mapping: move all dma bounce code to separate dma ops structure Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 14:42 ` Russell King - ARM Linux
2011-06-20 14:42 ` Russell King - ARM Linux
2011-06-20 14:42 ` Russell King - ARM Linux
2011-06-20 15:31 ` Marek Szyprowski
2011-06-20 15:31 ` Marek Szyprowski
2011-06-20 15:31 ` Marek Szyprowski
2011-06-24 15:47 ` Arnd Bergmann
2011-06-24 15:47 ` Arnd Bergmann
2011-06-24 15:47 ` Arnd Bergmann
2011-06-27 14:20 ` Marek Szyprowski
2011-06-27 14:20 ` Marek Szyprowski
2011-06-27 14:20 ` Marek Szyprowski
2011-06-20 7:50 ` [PATCH 6/8] ARM: dma-mapping: remove redundant code and cleanup Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 7:50 ` [PATCH 7/8] common: dma-mapping: change alloc/free_coherent method to more generic alloc/free_attrs Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 14:45 ` KyongHo Cho
2011-06-20 14:45 ` KyongHo Cho
2011-06-20 14:45 ` KyongHo Cho
2011-06-20 15:06 ` Russell King - ARM Linux
2011-06-20 15:06 ` Russell King - ARM Linux
2011-06-20 15:06 ` Russell King - ARM Linux
2011-06-20 15:06 ` Russell King - ARM Linux
2011-06-20 15:14 ` [Linaro-mm-sig] " KyongHo Cho
2011-06-20 15:14 ` KyongHo Cho
2011-06-20 15:14 ` KyongHo Cho
2011-06-21 11:23 ` Marek Szyprowski
2011-06-21 11:23 ` Marek Szyprowski
2011-06-21 11:23 ` Marek Szyprowski
2011-06-22 0:00 ` [Linaro-mm-sig] " KyongHo Cho
2011-06-22 0:00 ` KyongHo Cho
2011-06-22 0:00 ` KyongHo Cho
2011-06-24 7:20 ` Marek Szyprowski
2011-06-24 7:20 ` Marek Szyprowski
2011-06-24 7:20 ` Marek Szyprowski
2011-06-24 15:51 ` Arnd Bergmann
2011-06-24 15:51 ` Arnd Bergmann
2011-06-24 15:51 ` Arnd Bergmann
2011-06-24 16:15 ` James Bottomley
2011-06-24 16:15 ` James Bottomley
2011-06-24 16:15 ` James Bottomley
2011-06-24 16:23 ` Arnd Bergmann
2011-06-24 16:23 ` Arnd Bergmann
2011-06-24 16:23 ` Arnd Bergmann
2011-06-27 12:23 ` Marek Szyprowski
2011-06-27 12:23 ` Marek Szyprowski
2011-06-27 12:23 ` Marek Szyprowski
2011-06-27 12:23 ` Marek Szyprowski
2011-06-27 13:22 ` Arnd Bergmann
2011-06-27 13:22 ` Arnd Bergmann
2011-06-27 13:22 ` Arnd Bergmann
2011-06-27 13:30 ` Marek Szyprowski
2011-06-27 13:30 ` Marek Szyprowski
2011-06-27 13:30 ` Marek Szyprowski
2011-06-24 15:53 ` Arnd Bergmann
2011-06-24 15:53 ` Arnd Bergmann
2011-06-24 15:53 ` Arnd Bergmann
2011-06-27 14:41 ` Marek Szyprowski
2011-06-27 14:41 ` Marek Szyprowski
2011-06-27 14:41 ` Marek Szyprowski
2011-06-20 7:50 ` [PATCH 8/8] ARM: dma-mapping: use alloc, mmap, free from dma_ops Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-20 7:50 ` Marek Szyprowski
2011-06-22 6:53 ` [Linaro-mm-sig] " KyongHo Cho
2011-06-22 6:53 ` KyongHo Cho
2011-06-22 6:53 ` KyongHo Cho
2011-06-22 4:53 ` [Linaro-mm-sig] [PATCH/RFC 0/8] ARM: DMA-mapping framework redesign Subash Patel
2011-06-22 4:53 ` Subash Patel
2011-06-22 4:53 ` Subash Patel
2011-06-22 6:59 ` Marek Szyprowski
2011-06-22 6:59 ` Marek Szyprowski
2011-06-22 6:59 ` Marek Szyprowski
2011-06-22 8:53 ` Subash Patel
2011-06-22 8:53 ` Subash Patel
2011-06-22 8:53 ` Subash Patel
2011-06-22 9:27 ` Marek Szyprowski
2011-06-22 9:27 ` Marek Szyprowski
2011-06-22 9:27 ` Marek Szyprowski
2011-06-22 16:00 ` Jordan Crouse
2011-06-22 16:00 ` Jordan Crouse
2011-06-22 16:00 ` Jordan Crouse
2011-06-23 13:09 ` Subash Patel
2011-06-23 13:09 ` Subash Patel
2011-06-23 13:09 ` Subash Patel
2011-06-23 16:24 ` Michael K. Edwards
2011-06-23 16:24 ` Michael K. Edwards
2011-06-23 16:24 ` Michael K. Edwards
2011-06-23 22:09 ` Michael K. Edwards
2011-06-23 22:09 ` Michael K. Edwards
2011-06-23 22:09 ` Michael K. Edwards
2011-06-25 5:23 ` Jonathan Morton
2011-06-25 5:23 ` Jonathan Morton
2011-06-25 5:23 ` Jonathan Morton
2011-06-25 9:55 ` Michael K. Edwards
2011-06-25 9:55 ` Michael K. Edwards
2011-06-25 9:55 ` Michael K. Edwards
2011-06-26 0:06 ` Jonathan Morton
2011-06-26 0:06 ` Jonathan Morton
2011-06-26 0:06 ` Jonathan Morton
2011-06-24 15:20 ` Arnd Bergmann
2011-06-24 15:20 ` Arnd Bergmann
2011-06-24 15:20 ` Arnd Bergmann
2011-06-24 9:18 ` Joerg Roedel
2011-06-24 9:18 ` Joerg Roedel
2011-06-24 9:18 ` Joerg Roedel
2011-06-24 14:26 ` Marek Szyprowski
2011-06-24 14:26 ` Marek Szyprowski
2011-06-24 14:26 ` Marek Szyprowski
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110624083909.GB29299@8bytes.org \
--to=joro@8bytes.org \
--cc=arnd@arndb.de \
--cc=kyungmin.park@samsung.com \
--cc=linaro-mm-sig@lists.linaro.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-mm@kvack.org \
--cc=linux@arm.linux.org.uk \
--cc=m.szyprowski@samsung.com \
--cc=pullip.cho@samsung.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.