From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: allow, but warn, when issuing ioremap() on RAM
Date: Sat, 9 Oct 2010 13:05:37 +0100 [thread overview]
Message-ID: <20101009120537.GD20975@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20101009114444.GL29673@pengutronix.de>
On Sat, Oct 09, 2010 at 01:44:44PM +0200, Uwe Kleine-K?nig wrote:
> Hello,
>
> On Sat, Oct 09, 2010 at 01:11:26PM +0200, Arnd Bergmann wrote:
> > When you say that "many drivers broken", can you list the ones you know
> > about? It would probably help resolve this the right way.
> I know about the camera stuff on mx3/pcm037. See
> pcm037_camera_alloc_dma in arch/arm/mach-mx3/mach-pcm037.c.
dma_alloc_coherent, stuffing that into dma_declare_coherent_memory,
which then ioremaps the memory obtained from dma_alloc_coherent, and
is then handed out via a subsequent dma_alloc_coherent call.
So what we end up with is the kernel mapping (normal memory, cacheable),
the DMA coherent mapping (normal memory, non-cacheable) but with the
same shared-ness as the kernel mapping, and finally the ioremap mapping
(device, shared). So three aliasing mappings all with different
attributes.
WARNING: multiple messages have this Message-ID (diff)
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Arnd Bergmann <arnd@arndb.de>,
linux-arm-kernel@lists.infradead.org,
Felipe Contreras <felipe.contreras@gmail.com>,
Arnd Hannemann <arnd@arndnet.de>,
Hemant Pedanekar <hemantp@ti.com>, Greg KH <greg@kroah.com>,
linux-main <linux-kernel@vger.kernel.org>,
Han Jonghun <jonghun79.han@gmail.com>
Subject: Re: [PATCH] ARM: allow, but warn, when issuing ioremap() on RAM
Date: Sat, 9 Oct 2010 13:05:37 +0100 [thread overview]
Message-ID: <20101009120537.GD20975@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20101009114444.GL29673@pengutronix.de>
On Sat, Oct 09, 2010 at 01:44:44PM +0200, Uwe Kleine-König wrote:
> Hello,
>
> On Sat, Oct 09, 2010 at 01:11:26PM +0200, Arnd Bergmann wrote:
> > When you say that "many drivers broken", can you list the ones you know
> > about? It would probably help resolve this the right way.
> I know about the camera stuff on mx3/pcm037. See
> pcm037_camera_alloc_dma in arch/arm/mach-mx3/mach-pcm037.c.
dma_alloc_coherent, stuffing that into dma_declare_coherent_memory,
which then ioremaps the memory obtained from dma_alloc_coherent, and
is then handed out via a subsequent dma_alloc_coherent call.
So what we end up with is the kernel mapping (normal memory, cacheable),
the DMA coherent mapping (normal memory, non-cacheable) but with the
same shared-ness as the kernel mapping, and finally the ioremap mapping
(device, shared). So three aliasing mappings all with different
attributes.
next prev parent reply other threads:[~2010-10-09 12:05 UTC|newest]
Thread overview: 209+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-07 9:44 [PATCH] ARM: allow, but warn, when issuing ioremap() on RAM Felipe Contreras
2010-10-07 9:44 ` Felipe Contreras
2010-10-07 11:51 ` Baruch Siach
2010-10-07 11:51 ` Baruch Siach
2010-10-07 12:29 ` [PATCH v2] " Felipe Contreras
2010-10-07 12:29 ` Felipe Contreras
2010-10-07 18:00 ` Uwe Kleine-König
2010-10-07 18:00 ` Uwe Kleine-König
2010-10-07 19:22 ` [PATCH] " Russell King - ARM Linux
2010-10-07 19:22 ` Russell King - ARM Linux
2010-10-08 9:32 ` Felipe Contreras
2010-10-08 9:32 ` Felipe Contreras
2010-10-08 17:53 ` Russell King - ARM Linux
2010-10-08 17:53 ` Russell King - ARM Linux
2010-10-08 19:37 ` Felipe Contreras
2010-10-08 19:37 ` Felipe Contreras
2010-10-08 23:04 ` Russell King - ARM Linux
2010-10-08 23:04 ` Russell King - ARM Linux
2010-10-08 23:25 ` Greg KH
2010-10-08 23:25 ` Greg KH
2010-10-08 23:44 ` Russell King - ARM Linux
2010-10-08 23:44 ` Russell King - ARM Linux
2010-10-09 0:00 ` Greg KH
2010-10-09 0:00 ` Greg KH
2010-10-09 0:25 ` Russell King - ARM Linux
2010-10-09 0:25 ` Russell King - ARM Linux
2010-10-09 0:54 ` Greg KH
2010-10-09 0:54 ` Greg KH
2010-10-09 2:41 ` Nicolas Pitre
2010-10-09 2:41 ` Nicolas Pitre
2010-10-09 3:04 ` Greg KH
2010-10-09 3:04 ` Greg KH
2010-10-09 9:32 ` Felipe Contreras
2010-10-09 9:32 ` Felipe Contreras
2010-10-11 10:05 ` Catalin Marinas
2010-10-11 10:05 ` Catalin Marinas
2010-10-11 10:39 ` Felipe Contreras
2010-10-11 10:39 ` Felipe Contreras
2010-10-11 10:52 ` Russell King - ARM Linux
2010-10-11 10:52 ` Russell King - ARM Linux
2010-10-11 11:23 ` Catalin Marinas
2010-10-11 11:23 ` Catalin Marinas
2010-10-11 12:03 ` Felipe Contreras
2010-10-11 12:03 ` Felipe Contreras
2010-10-11 12:30 ` Catalin Marinas
2010-10-11 12:30 ` Catalin Marinas
2010-10-11 22:53 ` Nicolas Pitre
2010-10-11 22:53 ` Nicolas Pitre
2010-10-14 15:02 ` Felipe Contreras
2010-10-14 15:02 ` Felipe Contreras
2010-10-14 17:18 ` Catalin Marinas
2010-10-14 17:18 ` Catalin Marinas
2010-10-14 17:44 ` Felipe Contreras
2010-10-14 17:44 ` Felipe Contreras
2010-10-11 11:01 ` Pawel Moll
2010-10-11 11:01 ` Pawel Moll
2010-10-11 11:03 ` Catalin Marinas
2010-10-11 11:03 ` Catalin Marinas
2010-10-16 2:39 ` Benjamin Herrenschmidt
2010-10-16 2:39 ` Benjamin Herrenschmidt
2010-10-16 9:43 ` Felipe Contreras
2010-10-16 9:43 ` Felipe Contreras
2010-10-09 0:10 ` Russell King - ARM Linux
2010-10-09 0:10 ` Russell King - ARM Linux
2010-10-09 0:56 ` Felipe Contreras
2010-10-09 0:56 ` Felipe Contreras
2010-10-09 9:21 ` Russell King - ARM Linux
2010-10-09 9:21 ` Russell King - ARM Linux
2010-10-09 10:28 ` Felipe Contreras
2010-10-09 10:28 ` Felipe Contreras
2010-10-09 11:11 ` Arnd Bergmann
2010-10-09 11:11 ` Arnd Bergmann
2010-10-09 11:43 ` Dave Airlie
2010-10-09 11:43 ` Dave Airlie
2010-10-09 11:55 ` Christoph Hellwig
2010-10-09 11:55 ` Christoph Hellwig
2010-10-09 12:17 ` Felipe Contreras
2010-10-09 12:17 ` Felipe Contreras
2010-10-09 12:10 ` Felipe Contreras
2010-10-09 12:10 ` Felipe Contreras
2010-10-09 14:37 ` Russell King - ARM Linux
2010-10-09 14:37 ` Russell King - ARM Linux
2010-10-09 16:18 ` Felipe Contreras
2010-10-09 16:18 ` Felipe Contreras
2010-10-09 11:44 ` Uwe Kleine-König
2010-10-09 11:44 ` Uwe Kleine-König
2010-10-09 12:05 ` Russell King - ARM Linux [this message]
2010-10-09 12:05 ` Russell King - ARM Linux
2010-10-09 11:59 ` Felipe Contreras
2010-10-09 11:59 ` Felipe Contreras
2010-10-09 14:43 ` Arnd Bergmann
2010-10-09 14:43 ` Arnd Bergmann
2010-10-09 18:59 ` Guennadi Liakhovetski
2010-10-09 18:59 ` Guennadi Liakhovetski
2010-10-10 1:52 ` Felipe Contreras
2010-10-10 1:52 ` Felipe Contreras
2010-10-11 8:35 ` Uwe Kleine-König
2010-10-11 8:35 ` Uwe Kleine-König
2010-10-11 9:02 ` Russell King - ARM Linux
2010-10-11 9:02 ` Russell King - ARM Linux
2010-10-11 9:24 ` Uwe Kleine-König
2010-10-11 9:24 ` Uwe Kleine-König
2010-10-11 10:08 ` Felipe Contreras
2010-10-11 10:08 ` Felipe Contreras
2010-10-11 10:15 ` Russell King - ARM Linux
2010-10-11 10:15 ` Russell King - ARM Linux
2010-10-11 15:25 ` Russell King - ARM Linux
2010-10-11 15:25 ` Russell King - ARM Linux
2010-10-14 14:47 ` Felipe Contreras
2010-10-14 14:47 ` Felipe Contreras
2010-10-19 8:13 ` Colin Cross
2010-10-19 8:13 ` Colin Cross
2010-10-19 18:12 ` Russell King - ARM Linux
2010-10-19 18:12 ` Russell King - ARM Linux
2010-10-19 19:21 ` Russell King - ARM Linux
2010-10-19 19:21 ` Russell King - ARM Linux
2010-11-23 9:43 ` [PATCH] ARM: mx3/pcm037: properly allocate memory for mx3-camera Uwe Kleine-König
2010-11-23 10:12 ` Russell King - ARM Linux
2010-11-23 10:26 ` Uwe Kleine-König
2010-11-23 14:08 ` Alberto Panizzo
2010-11-23 14:17 ` Uwe Kleine-König
2010-11-24 8:02 ` Uwe Kleine-König
2010-12-06 8:33 ` Uwe Kleine-König
2010-12-06 10:14 ` Alberto Panizzo
2010-12-06 10:26 ` Russell King - ARM Linux
2010-12-06 11:37 ` Alberto Panizzo
2010-12-06 11:46 ` Russell King - ARM Linux
2010-12-06 14:09 ` Alberto Panizzo
2010-12-06 14:34 ` Russell King - ARM Linux
2010-12-06 14:54 ` Alberto Panizzo
2010-12-06 16:54 ` Alberto Panizzo
2010-11-23 10:39 ` About multi-line printk and the need (not) to repeat loglevel markers [Was: Re: [PATCH] ARM: mx3/pcm037: properly allocate memory for mx3-camera] Uwe Kleine-König
2010-11-23 10:39 ` Uwe Kleine-König
2010-11-23 10:58 ` Uwe Kleine-König
2010-11-23 10:58 ` Uwe Kleine-König
2010-11-23 22:16 ` Linus Torvalds
2010-11-23 22:16 ` Linus Torvalds
2010-11-23 22:33 ` Russell King - ARM Linux
2010-11-23 22:33 ` Russell King - ARM Linux
2010-11-23 23:23 ` Joe Perches
2010-11-23 23:23 ` Joe Perches
2010-11-24 0:57 ` [PATCH] md: Fix single printks with multiple KERN_<level>s Joe Perches
2010-11-24 5:16 ` Neil Brown
2010-11-24 8:17 ` About multi-line printk and the need (not) to repeat loglevel markers [Was: Re: [PATCH] ARM: mx3/pcm037: properly allocate memory for mx3-camera] Uwe Kleine-König
2010-11-24 8:17 ` Uwe Kleine-König
2010-11-24 8:56 ` [PATCH 0/6] add some KERN_CONT markers to continuation lines Uwe Kleine-König
2010-11-24 8:57 ` [PATCH 1/6] ARM: " Uwe Kleine-König
2010-11-24 8:57 ` Uwe Kleine-König
2010-11-24 8:57 ` [PATCH 2/6] block: " Uwe Kleine-König
2010-11-24 8:57 ` [PATCH 3/6] net: " Uwe Kleine-König
2010-11-28 18:48 ` David Miller
2010-11-24 8:57 ` [PATCH 4/6] init: " Uwe Kleine-König
2010-11-24 8:57 ` [PATCH 5/6] mm: " Uwe Kleine-König
2010-11-24 8:57 ` Uwe Kleine-König
2011-02-28 15:17 ` Uwe Kleine-König
2011-02-28 15:17 ` Uwe Kleine-König
2011-03-01 21:46 ` Linus Torvalds
2011-03-01 21:46 ` Linus Torvalds
2011-03-02 5:28 ` Joe Perches
2011-03-02 5:28 ` Joe Perches
2010-11-24 8:57 ` [PATCH 6/6] tty/vt: " Uwe Kleine-König
2011-02-28 15:16 ` Uwe Kleine-König
2011-02-28 15:39 ` Greg KH
2011-02-28 15:50 ` Uwe Kleine-König
2011-02-28 16:04 ` Greg KH
2011-03-01 3:18 ` Greg KH
2010-11-24 9:09 ` About multi-line printk and the need (not) to repeat loglevel markers [Was: Re: [PATCH] ARM: mx3/pcm037: properly allocate memory for mx3-camera] Michał Mirosław
2010-11-24 9:09 ` Michał Mirosław
2010-11-23 22:54 ` [PATCH] ARM: mx3/pcm037: properly allocate memory for mx3-camera Guennadi Liakhovetski
2010-10-09 0:45 ` [PATCH] ARM: allow, but warn, when issuing ioremap() on RAM Felipe Contreras
2010-10-09 0:45 ` Felipe Contreras
2010-10-09 8:56 ` Russell King - ARM Linux
2010-10-09 8:56 ` Russell King - ARM Linux
2010-10-08 23:19 ` Greg KH
2010-10-08 23:19 ` Greg KH
2010-10-09 3:36 ` Nicolas Pitre
2010-10-09 3:36 ` Nicolas Pitre
2010-10-09 10:00 ` Felipe Contreras
2010-10-09 10:00 ` Felipe Contreras
2010-10-09 17:38 ` Nicolas Pitre
2010-10-09 17:38 ` Nicolas Pitre
2010-10-09 20:16 ` Felipe Contreras
2010-10-09 20:16 ` Felipe Contreras
2010-10-13 16:17 ` Woodruff, Richard
2010-10-13 16:17 ` Woodruff, Richard
2010-10-14 13:48 ` Felipe Contreras
2010-10-14 13:48 ` Felipe Contreras
2010-10-14 15:29 ` Woodruff, Richard
2010-10-14 15:29 ` Woodruff, Richard
2010-10-16 2:36 ` Benjamin Herrenschmidt
2010-10-16 2:36 ` Benjamin Herrenschmidt
2010-10-17 13:05 ` Woodruff, Richard
2010-10-17 13:05 ` Woodruff, Richard
2010-10-17 23:17 ` Benjamin Herrenschmidt
2010-10-17 23:17 ` Benjamin Herrenschmidt
2010-10-08 19:58 ` Andrew Morton
2010-10-08 19:58 ` Andrew Morton
2010-10-09 13:52 ` Russell King - ARM Linux
2010-10-09 13:52 ` Russell King - ARM Linux
2010-10-09 16:07 ` Felipe Contreras
2010-10-09 16:07 ` Felipe Contreras
2010-10-09 16:45 ` Russell King - ARM Linux
2010-10-09 16:45 ` Russell King - ARM Linux
2010-10-09 19:25 ` Felipe Contreras
2010-10-09 19:25 ` Felipe Contreras
2010-10-10 14:23 ` Pedanekar, Hemant
2010-10-10 14:23 ` Pedanekar, Hemant
2010-10-11 9:26 ` Catalin Marinas
2010-10-11 9:26 ` Catalin Marinas
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=20101009120537.GD20975@n2100.arm.linux.org.uk \
--to=linux@arm.linux.org.uk \
--cc=linux-arm-kernel@lists.infradead.org \
/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.