Messages in this thread | | | Date | Wed, 12 Jun 2002 09:09:09 -0700 | From | William Jhun <> | Subject | Re: PCI DMA to small buffers on cache-incoherent arch |
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On Wed, Jun 12, 2002 at 04:47:59AM -0700, David S. Miller wrote: > From: William Jhun <wjhun@ayrnetworks.com> > Date: Mon, 10 Jun 2002 11:07:40 -0700 > > On Sun, Jun 09, 2002 at 09:27:05PM -0700, David S. Miller wrote: > > I'm trying to specify this such that knowledge of cachelines and > > whatnot don't escape the arch specific code, ho hum... Looks like > > that isn't possible. > > Perhaps provide macros in asm/pci.h that will: > > You don't understand, I think. I want to avoid the drivers doing > any of the "align this, align that" stuff. I want the allocation > to do it for them, that way the code is in one place.
No, I do understand your point. And this does not bring "knowledge of cachelines and whatnot" into the driver; those "macros" could similarly be calls to arch-specific code that acts based on a pdev. I was simply trying to think of a compromise between that and massively changing the interface by which a driver obtains buffers. And I assume alloc_skb() and others would need to change otherwise. How would you specify if your skb data needs to be PCI DMA-able? What about net drivers not using DMA at all?
Thanks, Will - 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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