linux-kernel - Re: DMA APIs gumble grumble

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Message-Id: <1163029281.28571.767.camel@localhost.localdomain>
Date:	Thu, 09 Nov 2006 10:41:21 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	Muli Ben-Yehuda <muli@...ibm.com>,
	linux-input@...ey.karlin.mff.cuni.cz,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Mackerras <paulus@...ba.org>,
	Anton Blanchard <anton@...ba.org>, Greg KH <greg@...ah.com>
Subject: Re: DMA APIs gumble grumble

On Wed, 2006-11-08 at 22:56 +0000, Russell King wrote:
> On Wed, Nov 08, 2006 at 07:47:33PM +1100, Benjamin Herrenschmidt wrote:
> > Yes, I need multiple dma_ops for powerpc too
> 
> Ditto for ARM.

Ok, so there is some interest in having the dma_ops in struct device
beyond powerpc.

I'll put together today a patch doing:

 - add #include <asm/device.h> to linux/device.h
 - add a device.h file in asm/* that does:

	struct dev_sysdata {
	};

 - add a struct dev_sysdata sysdata; field to struct device

That patch alone is 0 overhead and allows archs to start adding things.
I'll then modify my pending patches for 2.6.20 to use that instead of my
current device_ext thing.

Is that ok with everybody for 2.6.20 ?

Then, we can do, in no special order:

  - on x86, put the acpi data in there and remove firmware_data from
struct device

  - on x86, m32, frv, put the dma_coherent_mem pointer in there too and
remove it from struct device

  - you can use it on ARM to put your dma_operations pointer as I'm
doing in for powerpc

  - x86 can do the same 

etc...

Cheers,
Ben.


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