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From: Grant Grundler <grundler@parisc-linux.org>
To: Roland Dreier <rdreier@cisco.com>
Cc: Matthew Wilcox <matthew@wil.cx>, Yinghai Lu <yinghai@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Jesse Barnes <jbarnes@virtuousgeek.org>,
	FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
	grundler@parisc-linux.org, mingo@elte.hu, tglx@linutronix.de,
	hpa@zytor.com, linux-kernel@vger.kernel.org,
	linux-pci@vger.kernel.org
Subject: Re: [PATCH] pci: print out DMA mask info
Date: Sun, 12 Oct 2008 01:38:59 -0600	[thread overview]
Message-ID: <20081012073859.GE20056@colo.lackof.org> (raw)
In-Reply-To: <ada1vyojrme.fsf@cisco.com>

On Fri, Oct 10, 2008 at 10:18:33AM -0700, Roland Dreier wrote:
>  > Open-coding DMA_BIT_MASK() within your driver means that we no longer
>  > have a canonical list of DMA masks in one place.  Instead we have to
>  > grep the entire tree and come up with more-or-less complex scripts to
>  > figure out which bit masks are actually in use.
> 
> Out of curiousity, why do we care about that list?

Originally, I used to track down IO perf issues when porting drivers to ia64.

But knowing the dma masks in use on specific platforms might allow
folks to disable DMA_ZONE (like ia64 since it's always guarateed
either a SWIOTLB or real IOMMU).

Any other uses?

thanks,
grant

> 
>  - R.
> --
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  reply	other threads:[~2008-10-12  7:39 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-08 23:02 Yinghai Lu
2008-10-09 21:18 ` Grant Grundler
2008-10-09 21:27   ` Yinghai Lu
2008-10-09 21:35     ` Matthew Wilcox
2008-10-09 21:51       ` Yinghai Lu
2008-10-09 22:55         ` Grant Grundler
2008-10-09 23:05           ` Yinghai Lu
2008-10-10  2:40             ` FUJITA Tomonori
2008-10-10  4:56               ` Yinghai Lu
2008-10-10  6:08                 ` FUJITA Tomonori
2008-10-10  6:32                   ` Yinghai Lu
2008-10-10  7:32                     ` FUJITA Tomonori
2008-10-12  7:16                       ` Grant Grundler
2008-10-10 22:45               ` Grant Grundler
2008-10-14  6:50                 ` FUJITA Tomonori
2008-10-12  7:11             ` Grant Grundler
2008-10-23  1:45               ` [PATCH] pci: show dma_mask bits in /sys Yinghai Lu
2008-10-23  3:28                 ` Matthew Wilcox
2008-10-23  4:19                   ` Yinghai Lu
2008-10-23  6:44                   ` Grant Grundler
2008-10-23  8:38                     ` Rolf Eike Beer
2008-10-23 15:39                     ` Greg KH
2008-10-23 18:37                       ` H. Peter Anvin
2008-10-23 19:36                       ` Grant Grundler
2008-10-23 19:49                         ` Greg KH
2008-10-24 10:50                     ` Andi Kleen
2008-11-01 17:10                       ` Grant Grundler
2008-10-23  6:48                 ` Grant Grundler
2008-10-23  6:51                   ` Yinghai Lu
2008-10-23 19:28                     ` Grant Grundler
2008-10-10  2:40     ` [PATCH] pci: print out DMA mask info FUJITA Tomonori
2008-10-10  2:59       ` FUJITA Tomonori
2008-10-10  2:40   ` FUJITA Tomonori
2008-10-10 15:48     ` Jesse Barnes
2008-10-10 16:19       ` Yinghai Lu
2008-10-10 16:28         ` Jesse Barnes
2008-10-10 16:33         ` Matthew Wilcox
2008-10-10 16:46           ` Yinghai Lu
2008-10-10 17:12             ` Matthew Wilcox
2008-10-10 17:18               ` Roland Dreier
2008-10-12  7:38                 ` Grant Grundler [this message]
2008-10-12  7:20       ` Grant Grundler

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