Messages in this thread | | | From | Gerd Knorr <> | Subject | Re: [patch] zero-bounce highmem I/O | Date | 16 Aug 2001 12:14:40 GMT |
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> What if my scsi controller's pci DMA mask is 0x7fffffff or something > like this? You don't know at the generic layer, and you must provide > some way for the block device to indicate stuff like this to you.
While we are at it: Is there some portable way to figure whenever I can do a PCI DMA transfer to some page? On ia32 I can simply look at the physical address and if it is behind 4G it doesn't work for 32bit PCI devices. But I think that is not true for architectures which have a iommu ...
Gerd
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