On Wed, Oct 7, 2015 at 5:49 AM, Pavel Fedin <p.fedin@xxxxxxxxxxx> wrote:
> If non-LPAE kernel is booted up on a machine with 64-bit PCI resources,
> PCI controller probe fails with:
>
> PCI host bridge /pcie@10000000 ranges:
> IO 0x3eff0000..0x3effffff -> 0x00000000
> MEM 0x10000000..0x3efeffff -> 0x10000000
> MEM 0x8000000000..0xffffffffff -> 0x8000000000
> pci-host-generic 3f000000.pcie: resource collision: [mem 0x00000000-0xffffffff] conflicts with /pl011@9000000 [mem 0x09000000-0x09000fff]
> pci-host-generic: probe of 3f000000.pcie failed with error -16
>
> This happens because res->start assignment in of_pci_range_to_resource()
> truncates the upper part of the address, because res->start is of
> phys_addr_t type, which is 32-bit on non-LPAE kernels.
>
> This patch adds explicit recognition of 64-bit resources, preventing from
> potential problems when e. g. 0x8000001234 would be converted to
> 0x00001234.
>
> Signed-off-by: Pavel Fedin <p.fedin@xxxxxxxxxxx>
> ---
> drivers/of/address.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/of/address.c b/drivers/of/address.c
> index 384574c..9a8f8c3 100644
> --- a/drivers/of/address.c
> +++ b/drivers/of/address.c
> @@ -330,6 +330,12 @@ int of_pci_range_to_resource(struct of_pci_range *range,
> }
> res->start = port;
> } else {
> +#ifndef CONFIG_PHYS_ADDR_T_64BIT
> + if (upper_32_bits(range->cpu_addr)) {
Drop the ifdef:
if ((sizeof(phys_addr_t) > 4) && upper_32_bits(range->cpu_addr)) {
Seems fine otherwise.
> + err = -EINVAL;
> + goto invalid_range;
> + }
> +#endif
> res->start = range->cpu_addr;
> }
> res->end = res->start + range->size - 1;
> --
> 2.4.4
>
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