From: Ralf Baechle <ralf@linux-mips.org>
To: James Bottomley <James.Bottomley@suse.de>
Cc: linux-arch@vger.kernel.org, linux-parisc@vger.kernel.org
Subject: Re: [PATCH 1/6] mm: add coherence API for DMA to vmalloc/vmap areas
Date: Wed, 18 Nov 2009 15:38:15 +0100 [thread overview]
Message-ID: <20091118143815.GA17146@linux-mips.org> (raw)
In-Reply-To: <1258477432-2513-2-git-send-email-James.Bottomley@suse.de>
On Tue, Nov 17, 2009 at 11:03:47AM -0600, James Bottomley wrote:
> On Virtually Indexed architectures (which don't do automatic alias
> resolution in their caches), we have to flush via the correct
> virtual address to prepare pages for DMA. On some architectures
> (like arm) we cannot prevent the CPU from doing data movein along
> the alias (and thus giving stale read data), so we not only have to
> introduce a flush API to push dirty cache lines out, but also an invalidate
> API to kill inconsistent cache lines that may have moved in before
> DMA changed the data
The API looks right for MIPS and trivial to implement based on existing
code, so feel free to throw in my Ack on the generic parts.
The new APIs deserve documentation in Documentation/cachetlb.txt.
Ralf
next prev parent reply other threads:[~2009-11-18 14:38 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-17 17:03 [PATCH 0/6] fix xfs by making I/O to vmap/vmalloc areas work James Bottomley
2009-11-17 17:03 ` James Bottomley
2009-11-17 17:03 ` [PATCH 1/6] mm: add coherence API for DMA to vmalloc/vmap areas James Bottomley
2009-11-17 17:03 ` James Bottomley
2009-11-17 17:03 ` [PATCH 2/6] parisc: add mm " James Bottomley
2009-11-17 17:03 ` [PATCH 3/6] arm: " James Bottomley
2009-11-17 17:03 ` James Bottomley
2009-11-17 17:03 ` [PATCH 4/6] sh: " James Bottomley
2009-11-17 17:03 ` James Bottomley
2009-11-17 17:03 ` [PATCH 5/6] block: permit I/O to vmalloc/vmap kernel pages James Bottomley
2009-11-17 17:03 ` [PATCH 6/6] xfs: fix xfs to work with Virtually Indexed architectures James Bottomley
2009-11-18 10:10 ` [PATCH 5/6] block: permit I/O to vmalloc/vmap kernel pages FUJITA Tomonori
2009-11-18 13:50 ` James Bottomley
2009-11-18 13:50 ` James Bottomley
2009-11-18 14:15 ` FUJITA Tomonori
2009-11-18 14:15 ` FUJITA Tomonori
2009-11-18 14:21 ` James Bottomley
2009-11-18 14:21 ` James Bottomley
2009-11-18 14:38 ` Ralf Baechle [this message]
2009-11-18 14:38 ` [PATCH 1/6] mm: add coherence API for DMA to vmalloc/vmap areas Ralf Baechle
2009-11-18 15:13 ` James Bottomley
-- strict thread matches above, loose matches on Subject: below --
2009-09-17 23:06 [PATCH 0/6] fix xfs by making I/O to vmap/vmalloc areas work James Bottomley
2009-09-17 23:06 ` [PATCH 1/6] mm: add coherence API for DMA to vmalloc/vmap areas James Bottomley
2009-09-17 23:06 ` James Bottomley
2009-09-09 15:52 [PATCH 0/6] fix xfs by making I/O to vmap/vmalloc areas work James Bottomley
2009-09-09 15:52 ` [PATCH 1/6] mm: add coherence API for DMA to vmalloc/vmap areas James Bottomley
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