From: Grant Grundler <grundler@cup.hp.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: matthew@wil.cx (Matthew Wilcox), parisc-linux@thepuffingroup.com
Subject: Re: [parisc-linux] ZONE_DMA
Date: Mon, 01 Jan 2001 16:59:31 -0800 [thread overview]
Message-ID: <200101020059.QAA26152@milano.cup.hp.com> (raw)
In-Reply-To: Your message of "Mon, 01 Jan 2001 18:09:53 PST." <E14D9PA-00017j-00@the-village.bc.nu>
Alan Cox wrote:
> Some Alpha's probably can but we don't support that. The pci side API
> pci_alloc_consistent does
Nit: I think pci_dma_supported() is the interface meant here.
Documentation/DMA-mapping.txt has a good example here on how
pci_dma_supported() supports cripppled PCI devices.
Right now, SBA code (and CCIO too I think) only permit devices
that say they support 32-bit addressing. sba_dma_supported()
code needs to be revisited for two reasons:
o the number of bits the IO MMU actually uses is typically alot less
- depends on the size of the I/O Pdir. Ie it could support the
crippled PCI device pretty easily.
o Elroy HW supports 64-bit PCI addressing (Dual Address cycle).
grant
Grant Grundler
Unix Systems Enablement Lab
+1.408.447.7253
next prev parent reply other threads:[~2001-01-02 0:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-01 17:43 [parisc-linux] ZONE_DMA Matthew Wilcox
2001-01-01 18:09 ` Alan Cox
2001-01-01 18:24 ` Matthew Wilcox
2001-01-01 18:32 ` Alan Cox
2001-01-01 18:55 ` Matthew Wilcox
2001-01-01 19:01 ` Alan Cox
2001-01-01 19:18 ` Matthew Wilcox
2001-01-02 0:59 ` Grant Grundler [this message]
2001-01-02 1:21 ` Matthew Wilcox
2001-01-02 6:46 ` Grant Grundler
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