From: Grant Grundler <iod00d@hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [Linux-ia64] Re: [patch] support 64 bit pci_alloc_consistent
Date: Sun, 18 May 2003 17:22:03 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590723705937@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590723705928@msgid-missing>
On Sun, May 18, 2003 at 09:43:41AM +0000, Arjan van de Ven wrote:
> Most drivers will just say "look I
> can do THIS much. I don't give a flying fish about how much of
> that you actually use". At least in the probing code.
The platform code needs a way to indicate the given mask will not work.
Rejecting proposals by the driver seems reasonable if the driver
only supports two different masks anyway (eg 64 and 32-bit).
In the case of a platform requiring 64-bit masks for consistent mappings,
the platform DMA code must reject proposals for non-64-bit DMA masks.
(eg PCI-X device implementing less than 64-bits)
In both cases the driver will care because it will crash the box otherwise.
grant
next prev parent reply other threads:[~2003-05-18 17:22 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-18 5:46 [Linux-ia64] Re: [patch] support 64 bit pci_alloc_consistent David S. Miller
2003-05-18 6:00 ` Andre Hedrick
2003-05-18 9:29 ` Arjan van de Ven
2003-05-18 9:35 ` David S. Miller
2003-05-18 9:43 ` Arjan van de Ven
2003-05-18 14:17 ` James Bottomley
2003-05-18 14:21 ` Arjan van de Ven
2003-05-18 14:28 ` James Bottomley
2003-05-18 17:22 ` Grant Grundler [this message]
2003-05-18 17:49 ` James Bottomley
2003-05-18 20:17 ` Grant Grundler
2003-05-18 21:26 ` James Bottomley
2003-05-19 16:26 ` Grant Grundler
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