From: "Michael Chan" <[EMAIL PROTECTED]> Date: Wed, 02 May 2007 14:27:49 -0700
> I see. So IA64 always uses the SWIOTLB when it doesn't have IOMMU then? > > I'm a bit confused. Is it enough to just set the DMA mask to 40-bit and > forget about all this checking? I thought that wasn't enough. A tx > packet can be anywhere in 64-bit memory. When it gets to the driver, > pci_map will not do any translation even if DMA mask is set to 40-bit if > it doesn't have IOMMU. Is that right? If the buffer doesn't meet the DMA mask specification, it should do bounce buffering. Have a look at lib/swiotlb.c, that is exactly what it appears to be doing. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
