From: Gerd Knorr <kraxel@suse.de>
To: linux-kernel@vger.kernel.org
Subject: Re: Will __pa(vmalloc()) ever work?
Date: 30 May 2005 11:38:32 +0200 [thread overview]
Message-ID: <873bs5yrxj.fsf@bytesex.org> (raw)
In-Reply-To: <4297746C.10900@ammasso.com>
Timur Tabi <timur.tabi@ammasso.com> writes:
> Also, does the pgd/pmd/pte page-table walking work on addresses
> returned by kmalloc(), or do I have to use __pa() to get the physical
> address?
You should use vmalloc_to_page() (this does the page-table walking
with correct locking), then the usual dma mapping interface
(pci_map_page() or pci_map_sg()) to get bus address(es) you can pass
to your device for DMA.
Gerd
next prev parent reply other threads:[~2005-05-30 9:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-27 19:26 Will __pa(vmalloc()) ever work? Timur Tabi
2005-05-27 19:29 ` Christoph Hellwig
2005-05-27 19:54 ` Timur Tabi
2005-05-27 20:31 ` Arnd Bergmann
2005-05-28 16:16 ` Russell King
2005-05-30 9:38 ` Gerd Knorr [this message]
2005-05-31 15:51 ` Timur Tabi
2005-05-31 16:13 ` Gerd Knorr
2005-05-31 18:59 ` Timur Tabi
2005-05-31 20:01 ` Russell King
2005-05-31 20:44 ` Brian Gerst
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