Re: [PATCH v7 3/3] arm64: Add architecture support for PCI

Rob Herring
2014-03-17T16:05:38Z

On Fri, Mar 14, 2014 at 10:34 AM, Liviu Dudau <Liviu.Dudau-5wv7dgnIgG8@public.gmane.org> wrote:
> Use the generic host bridge functions to provide support for
> PCI Express on arm64. There is no support for ISA memory.
>
> Signed-off-by: Liviu Dudau <Liviu.Dudau-5wv7dgnIgG8@public.gmane.org>
> Tested-by: Tanmay Inamdar <tinamdar-qTEPVZfXA3Y@public.gmane.org>
> ---
> arch/arm64/Kconfig | 19 +++-
> arch/arm64/include/asm/Kbuild | 1 +
> arch/arm64/include/asm/io.h | 3 +-
> arch/arm64/include/asm/pci.h | 51 ++++++++++
> arch/arm64/kernel/Makefile | 1 +
> arch/arm64/kernel/pci.c | 173 ++++++++++++++++++++++++++++++++
> 6 files changed, 246 insertions(+), 2 deletions(-)
> create mode 100644 arch/arm64/include/asm/pci.h
> create mode 100644 arch/arm64/kernel/pci.c

[snip]

> +#endif
> +
> +extern unsigned long pci_ioremap_io(const struct resource *res, phys_addr_t phys_addr);

Can we at least align the function definition across architectures if
not the implementation.

> +int pci_register_io_range(phys_addr_t address, resource_size_t size)
> +{
> + struct ioresource *res;
> + resource_size_t allocated_size = 0;
> +
> + /* find if the range has not been already allocated */
> + list_for_each_entry(res, &io_list, list) {
> + if (address >= res->start &&
> + address + size <= res->start + size)
> + return 0;
> + allocated_size += res->size;
> + }
> +
> + /* range not already registered, check for space */
> + if (allocated_size + size > IO_SPACE_LIMIT)

I believe this needs to be "allocated_size + size - 1".

> + return -E2BIG;
> +
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