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generic device DMA implementation

RFC James Bottomley 1 participant 2 messages Dec 5, 2002 – Dec 28, 2002 1 message not in the archive

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A message that is not in the archive (sent off-list or not yet received): [email protected]

James Bottomley

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Quoted 2 lines · [email protected] said:

I'd rather keep our existing pci_* API than be forced into this crap again.

Let me just clarify: I'm not planning to revoke the pci_* API, or to deviate substantially from it. I'm not even planning to force any arch's to use it if they don't want to. I'm actually thinking of putting something like this in the asm-generic implementations:

dma_*(struct device *dev, ...) {
	BUG_ON(dev->bus != &pci_bus_type)
	pci_*(to_pci_device(dev), ..)
}

The whole point is not to force another massive shift in the way drivers are written, but to provide a generic device based API for those who need it. There are very few drivers that actually have to allocate fake PCI devices today, but this API is aimed squarely at helping them. Drivers that only ever see real PCI devices won't need touching.

James