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 12:06 UTC|newest]
Thread overview: 103+ 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 11:51 ` Baruch Siach
2010-10-07 12:29 ` [PATCH v2] " Felipe Contreras
2010-10-07 18:00 ` Uwe Kleine-König
2010-10-07 19:22 ` [PATCH] " Russell King - ARM Linux
2010-10-08 9:32 ` Felipe Contreras
2010-10-08 17:53 ` Russell King - ARM Linux
2010-10-08 19:37 ` Felipe Contreras
2010-10-08 23:04 ` Russell King - ARM Linux
2010-10-08 23:25 ` Greg KH
2010-10-08 23:44 ` Russell King - ARM Linux
2010-10-09 0:00 ` Greg KH
2010-10-09 0:25 ` Russell King - ARM Linux
2010-10-09 0:54 ` Greg KH
2010-10-09 2:41 ` Nicolas Pitre
2010-10-09 3:04 ` Greg KH
2010-10-09 9:32 ` Felipe Contreras
2010-10-11 10:05 ` Catalin Marinas
2010-10-11 10:39 ` Felipe Contreras
2010-10-11 10:52 ` Russell King - ARM Linux
2010-10-11 11:23 ` Catalin Marinas
2010-10-11 12:03 ` Felipe Contreras
2010-10-11 12:30 ` Catalin Marinas
2010-10-11 22:53 ` Nicolas Pitre
2010-10-14 15:02 ` Felipe Contreras
2010-10-14 17:18 ` Catalin Marinas
2010-10-14 17:44 ` Felipe Contreras
2010-10-11 11:01 ` Pawel Moll
2010-10-11 11:03 ` Catalin Marinas
2010-10-16 2:39 ` Benjamin Herrenschmidt
2010-10-16 9:43 ` Felipe Contreras
2010-10-09 0:10 ` Russell King - ARM Linux
2010-10-09 0:56 ` Felipe Contreras
2010-10-09 9:21 ` Russell King - ARM Linux
2010-10-09 10:28 ` Felipe Contreras
2010-10-09 11:11 ` Arnd Bergmann
2010-10-09 11:43 ` Dave Airlie
2010-10-09 11:55 ` Christoph Hellwig
2010-10-09 12:17 ` Felipe Contreras
2010-10-09 12:10 ` Felipe Contreras
2010-10-09 14:37 ` Russell King - ARM Linux
2010-10-09 16:18 ` Felipe Contreras
2010-10-09 11:44 ` Uwe Kleine-König
2010-10-09 12:05 ` Russell King - ARM Linux [this message]
2010-10-09 11:59 ` Felipe Contreras
2010-10-09 14:43 ` Arnd Bergmann
2010-10-09 18:59 ` Guennadi Liakhovetski
2010-10-10 1:52 ` Felipe Contreras
2010-10-11 8:35 ` Uwe Kleine-König
2010-10-11 9:02 ` Russell King - ARM Linux
2010-10-11 9:24 ` Uwe Kleine-König
2010-10-11 10:08 ` Felipe Contreras
2010-10-11 10:15 ` Russell King - ARM Linux
2010-10-11 15:25 ` Russell King - ARM Linux
2010-10-14 14:47 ` Felipe Contreras
2010-10-19 8:13 ` Colin Cross
2010-10-19 18:12 ` Russell King - ARM Linux
2010-10-19 19:21 ` Russell King - ARM Linux
[not found] ` <1290505382-16110-1-git-send-email-u.kleine-koenig@pengutronix.de>
[not found] ` <20101123101210.GA18170@n2100.arm.linux.org.uk>
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 10:58 ` Uwe Kleine-König
2010-11-23 22:16 ` Linus Torvalds
2010-11-23 22:33 ` Russell King - ARM Linux
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 8:56 ` [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 ` [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
2011-02-28 15:17 ` Uwe Kleine-König
2011-03-01 21:46 ` Linus Torvalds
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
2010-10-09 0:45 ` [PATCH] ARM: allow, but warn, when issuing ioremap() on RAM Felipe Contreras
2010-10-09 8:56 ` Russell King - ARM Linux
2010-10-08 23:19 ` Greg KH
2010-10-09 3:36 ` Nicolas Pitre
2010-10-09 10:00 ` Felipe Contreras
2010-10-09 17:38 ` Nicolas Pitre
2010-10-09 20:16 ` Felipe Contreras
2010-10-13 16:17 ` Woodruff, Richard
2010-10-14 13:48 ` Felipe Contreras
2010-10-14 15:29 ` Woodruff, Richard
2010-10-16 2:36 ` Benjamin Herrenschmidt
2010-10-17 13:05 ` Woodruff, Richard
2010-10-17 23:17 ` Benjamin Herrenschmidt
2010-10-08 19:58 ` Andrew Morton
2010-10-09 13:52 ` Russell King - ARM Linux
2010-10-09 16:07 ` Felipe Contreras
2010-10-09 16:45 ` Russell King - ARM Linux
2010-10-09 19:25 ` Felipe Contreras
2010-10-10 14:23 ` Pedanekar, Hemant
2010-10-11 9:26 ` Catalin Marinas
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