From: Matt_Domsch@Dell.com
To: linux-ia64@vger.kernel.org
Subject: [Linux-ia64] RE: DMA memory limitation?
Date: Fri, 06 Jul 2001 15:56:47 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590693005820@msgid-missing> (raw)
> The important thing is that pci_alloc_consistent and the other PCI DMA
> functions work as advertised on IA64. If you pass NULL to
> pci_alloc_consistent, IA64 should give you an ISA DMA-able
> address. If
> you don't, you get a 32-bit PCI DMA address. Use of GFP_DMA is a
> arch-specific detail, so don't let me confuse you there.
Until recently, on IA-64, pci_alloc_consistent() given a NULL pci_dev would
fault. It's been fixed in at least the most recent IA-64 patch.
pci_map_single() and pci_map_sg() still have the same problem, as they
dereference pci_dev w/o checking for NULL first.
--
Matt Domsch
Sr. Software Engineer
Dell Linux Solutions
www.dell.com/linux
#2 Linux Server provider with 17% in the US and 14% Worldwide (IDC)!
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next reply other threads:[~2001-07-06 15:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-06 15:56 Matt_Domsch [this message]
2001-07-09 13:54 ` [Linux-ia64] RE: DMA memory limitation? White, Charles
2001-07-09 14:46 ` Matt_Domsch
2001-07-09 15:02 ` White, Charles
2001-07-09 15:20 ` Matt_Domsch
2001-07-09 15:33 ` White, Charles
2001-07-10 15:42 ` Jes Sorensen
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