On Monday 14 July 2014 17:54:43 Catalin Marinas wrote:
> On Tue, Jul 01, 2014 at 07:43:34PM +0100, Liviu Dudau wrote:
> > Introduce a default implementation for remapping PCI bus I/O resources
> > onto the CPU address space. Architectures with special needs may
> > provide their own version, but most should be able to use this one.
> [...]
> > +/**
> > + * pci_remap_iospace - Remap the memory mapped I/O space
> > + * @res: Resource describing the I/O space
> > + * @phys_addr: physical address where the range will be mapped.
> > + *
> > + * Remap the memory mapped I/O space described by the @res
> > + * into the CPU physical address space. Only architectures
> > + * that have memory mapped IO defined (and hence PCI_IOBASE)
> > + * should call this function.
> > + */
> > +int __weak pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
> > +{
> > + int err = -ENODEV;
> > +
> > +#ifdef PCI_IOBASE
> > + if (!(res->flags & IORESOURCE_IO))
> > + return -EINVAL;
> > +
> > + if (res->end > IO_SPACE_LIMIT)
> > + return -EINVAL;
> > +
> > + err = ioremap_page_range(res->start + (unsigned long)PCI_IOBASE,
> > + res->end + 1 + (unsigned long)PCI_IOBASE,
> > + phys_addr, __pgprot(PROT_DEVICE_nGnRE));
>
> Except that PROT_DEVICE_nGnRE is arm64 only. I think that's a function
> that should remain arch specific.
>
How about #defining a macro with the correct pgprot value in asm/pci.h
or asm/pgtable.h?
We can provide a default for that in another architecture independent
location.
Arnd
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