lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <4A11E739.6080106@pobox.com>
Date:	Mon, 18 May 2009 18:54:49 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Robert Hancock <hancockrwd@...il.com>,
	Tejun Heo <htejun@...il.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	alan@...rguk.ukuu.org.uk, flar@...andria.com,
	schmitz@...phys.uni-duesseldorf.de, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org, takata@...ux-m32r.org,
	geert@...ux-m68k.org, linux-m68k@...r.kernel.org,
	ysato@...rs.sourceforge.jp
Subject: Re: [PATCH] asm-generic: add a dma-mapping.h file

Arnd Bergmann wrote:
> h8300 and m32r currently do not provide a DMA mapping API
> and therefore cannot use the ATA drivers. This adds a
> generic version of dma-mapping.h for architectures that
> have none or very minimal actual support for DMA in hardware
> and makes the two architectures use it.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> On Sunday 17 May 2009 20:05:54 Jeff Garzik wrote:
> 
>> That's what needs to happen.  We provide no-op functions for e.g. PCI 
>> and x86 DMI, for platforms where this support does not exist.
>>
>> Pretty much all architectures support some form of ATA.  m68k, m32r, 
>> h8300 and microblaze all have IDE interface, which means that libata 
>> needs to work on that platform.
>>
>> The only !ATA arch in the entire kernel is s390, AFAICT.
> 
> m68k only defines NO_DMA for Sun3 and Dragonball. Sun3 does
> not have ATA, Dragonball could probably just enable HAS_DMA.
> 
> ---
>  arch/h8300/Kconfig                   |    2 +-
>  arch/h8300/include/asm/dma-mapping.h |    1 +
>  arch/m32r/Kconfig                    |    2 +-
>  arch/m32r/include/asm/dma-mapping.h  |    1 +
>  include/asm-generic/dma-mapping.h    |  399 ++++++++++++++++++++++++++++++++++
>  5 files changed, 403 insertions(+), 2 deletions(-)
>  create mode 100644 arch/h8300/include/asm/dma-mapping.h
>  create mode 100644 arch/m32r/include/asm/dma-mapping.h
>  create mode 100644 include/asm-generic/dma-mapping.h

My main comment is a bit non-specific...   I tend to think that all 
no-dma platforms should provide an API whose implementation always 
returns errors, e.g. an inlined version of dma-mapping-broken.h.

That sort of setup permits the compiler's dead code elimination to work 
on these no-dma platforms, while not crapping up the libata code with a 
bunch of ifdefs.

	Jeff




--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ