On Wed, Dec 18, 2013 at 10:09 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote: > On system with more pcie cards, we do not have enough range under 4G > to allocate those pci devices. > > On 64bit system, we could try to allocate mem64 above 4G at first, > and fall back to below 4g if it can not find any above 4g. > > x86 32bit without X86_PAE support will have bottom set to 0, because > resource_size_t is 32bit. > For 32bit kernel that resource_size_t is 64bit when pae is support. > we are safe because iomem_resource is limited to 32bit according to > x86_phys_bits. > > -v2: update bottom assigning to make it clear for non-pae support machine. > -v3: Bjorn's change: > use MAX_RESOURCE instead of -1 > use start/end instead of bottom/max > for all arch instead of just x86_64 > -v4: updated after PCI_MAX_RESOURCE_32 change. > -v5: restore io handling to use PCI_MAX_RESOURCE_32 as limit. > -v6: checking pcibios_resource_to_bus return for every bus res, to decide it > if we need to try high at first. > It supports all arches instead of just x86_64. > -v7: split 4G limit change out to another patch according to Bjorn. > also use pci_clip_resource instead. > -v8: refresh after changes in pci/resource. looks still have other problem, will send out updated version later. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
