From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linuxppc-dev@ozlabs.org, Roland Dreier <rdreier@cisco.com>,
Peter Altevogt <peter.altevogt@de.ibm.com>,
cbe-oss-dev@ozlabs.org, Hans Boettiger <h.boettiger@de.ibm.com>
Subject: Re: [Cbe-oss-dev] [patch 9/9] powerpc/cell: Add DMA_ATTR_STRONG_ORDERING dma attribute and use in IOMMU code
Date: Fri, 18 Jul 2008 06:10:23 +1000 [thread overview]
Message-ID: <1216325423.7740.355.camel@pasglop> (raw)
In-Reply-To: <200807171653.29946.arnd@arndb.de>
On Thu, 2008-07-17 at 16:53 +0200, Arnd Bergmann wrote:
>
> Peter and Hans were involved in the discussion that led to the
> decision
> to change step 3 from per-transfer default to always weak ordering.
> I think they verified that this is safe for all the peripherals that
> we
> have on the QS21 and QS22 blades (tg3, ehci, mthca, mptsas), but that
> doesn't mean that it is safe in general, so I guess you are right that
> we should not make it the default in the kernel for Cell systems.
> Hans, can you confirm this?
I'm surprised with tg3. We need to make sure that updates to the
hw status block are properly ordered vs writes to the ring, among
other things.
Ben.
next prev parent reply other threads:[~2008-07-17 20:10 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-15 19:51 [patch 0/9] Cell patches for 2.6.27, version 2 arnd
2008-07-15 19:51 ` [patch 1/9] powerpc/cell/edac: log a syndrome code in case of correctable error arnd
2008-07-17 5:59 ` Benjamin Herrenschmidt
2008-07-17 18:35 ` Doug Thompson
2008-07-15 19:51 ` [patch 2/9] powerpc/axonram: use only one block device major number arnd
2008-07-15 19:51 ` [patch 3/9] powerpc/axonram: enable partitioning of the Axons DDR2 DIMMs arnd
2008-07-15 19:51 ` [patch 4/9] powerpc/cell/cpufreq: add spu aware cpufreq governor arnd
2008-07-15 19:51 ` [patch 5/9] powerpc/cell: cleanup sysreset_hack for IBM cell blades arnd
2008-07-15 19:51 ` [patch 6/9] powerpc/cell: add support for power button of future " arnd
2008-07-15 19:51 ` [patch 7/9] azfs: initial submit of azfs, a non-buffered filesystem arnd
2008-07-17 6:13 ` Benjamin Herrenschmidt
2008-07-22 9:49 ` [Cbe-oss-dev] " Christoph Hellwig
2008-07-15 19:51 ` [patch 8/9] powerpc/dma: use the struct dma_attrs in iommu code arnd
2008-07-15 19:51 ` [patch 9/9] powerpc/cell: Add DMA_ATTR_STRONG_ORDERING dma attribute and use in IOMMU code arnd
2008-07-15 20:34 ` Roland Dreier
2008-07-15 21:27 ` Arnd Bergmann
2008-07-16 2:18 ` Roland Dreier
2008-07-16 7:54 ` Arnd Bergmann
2008-07-17 6:20 ` [Cbe-oss-dev] " Benjamin Herrenschmidt
2008-07-17 14:53 ` Arnd Bergmann
2008-07-17 20:10 ` Benjamin Herrenschmidt [this message]
2008-07-17 20:10 ` Benjamin Herrenschmidt
2008-07-18 13:03 ` [PATCH] Add DMA_ATTR_WEAK_ORDERING dma attribute and use in Cell " Arnd Bergmann
2008-07-19 7:29 ` [Cbe-oss-dev] " Jeremy Kerr
2008-07-19 8:36 ` Arnd Bergmann
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