Re: [PATCH v8 9/9] pci: Remap I/O bus resources into CPU space with pci_remap_iospace()

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.