> >Look at other drivers using the DMA interfaces like the two aic7xxx
> >and all of the sym53c8xx drivers, they get it right.
>
> Grepping for vmalloc and kmap in them turns up no hits.
Why do you want to vmalloc() memory in the scsi driver?
> computer with >4GB of RAM (CONFIG_HIGHEM) talking to a PCI card
> that only does 32-bit addressing:
>
> pci_set_dma_mask(pcidev, 0xffffffff);
> addr = vmalloc(nbytes);
> /* On an x86 with >4GB of RAM, addr will be <4GB, but
> __pa(addr) might be >4GB, and the system lacks
> PCI address mapping harware. */
use vmalloc_32(), this one returns lowmem.
> dma_addr = pci_map_single(pcidev, addr, nbytes, direction);
This is illegal because addr is a kernel _virtual_ address. You have to
get the page using vmalloc_to_page() and feed this to pci_map_page()
then. With nbytes > PAGE_SIZE you probably want to build a scatterlist
and use pci_map_sg().
Gerd
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This archive was generated by hypermail 2b29 : Thu Mar 07 2002 - 21:00:52 EST