Messages in this thread | | | Date | Mon, 11 Mar 2002 10:44:41 -0500 | From | Jay Estabrook <> | Subject | Re: Busmaster DMA broken in 2.4.18 on Alpha |
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On Mon, Mar 11, 2002 at 07:16:56AM -0800, David S. Miller wrote: > From: Jay Estabrook <Jay.Estabrook@compaq.com> > Date: Mon, 11 Mar 2002 10:02:00 -0500 > > Since ISA devices don't have pci_dev structures, there's (currently) > no way to pass an ISA device-dependent DMA mask to the IOMMU routines. > Perhaps there needs to be an addition to the API that would allow > for this (pci_set_isa_device_dma_mask()) ??? > > What you could do currently is whip up a dummy pci_dev structure with > the mask you want and pass that into the PCI dma routines. So you > could, for example, default to 24-bit DMA mask when you get "NULL" > as pci_dev, but cook up a special one using a 32-bit DMA mask for the > floppy ISA device in question.
Yup, that'd work, though it would put the floppy's resources in with the PCI devices, rather than kept separate as ISA. Should work fine, though.
> The idea in 2.5.x is to move to a generic struct device, at which time > something like this can be done much more cleanly.
Sounds good, if only it'd compile on Alpha... ;-}
--Jay++
----------------------------------------------------------------------------- Jay A Estabrook Alpha Engineering - LINUX Project Compaq Computer Corp. - MRO1-2/K15 (508) 467-2080 200 Forest Street, Marlboro MA 01752 Jay.Estabrook@compaq.com ----------------------------------------------------------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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