diff options
Diffstat (limited to 'drivers/pci/setup-bus.c')
| -rw-r--r-- | drivers/pci/setup-bus.c | 78 |
1 files changed, 46 insertions, 32 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 336c96c1d2d5..d76674ec712c 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1869,18 +1869,33 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, struct resource mmio, struct resource mmio_pref) { - resource_size_t available_io, available_mmio, available_mmio_pref; - resource_size_t remaining_io, remaining_mmio, remaining_mmio_pref; unsigned int normal_bridges = 0, hotplug_bridges = 0; struct resource *io_res, *mmio_res, *mmio_pref_res; struct pci_dev *dev, *bridge = bus->self; - resource_size_t io_per_hp, mmio_per_hp, mmio_pref_per_hp; + resource_size_t io_per_hp, mmio_per_hp, mmio_pref_per_hp, align; io_res = &bridge->resource[PCI_BRIDGE_RESOURCES + 0]; mmio_res = &bridge->resource[PCI_BRIDGE_RESOURCES + 1]; mmio_pref_res = &bridge->resource[PCI_BRIDGE_RESOURCES + 2]; /* + * The alignment of this bridge is yet to be considered, hence it must + * be done now before extending its bridge window. + */ + align = pci_resource_alignment(bridge, io_res); + if (!io_res->parent && align) + io.start = min(ALIGN(io.start, align), io.end + 1); + + align = pci_resource_alignment(bridge, mmio_res); + if (!mmio_res->parent && align) + mmio.start = min(ALIGN(mmio.start, align), mmio.end + 1); + + align = pci_resource_alignment(bridge, mmio_pref_res); + if (!mmio_pref_res->parent && align) + mmio_pref.start = min(ALIGN(mmio_pref.start, align), + mmio_pref.end + 1); + + /* * Update additional resource list (add_list) to fill all the * extra resource space available for this port except the space * calculated in __pci_bus_size_bridges() which covers all the @@ -1925,12 +1940,9 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, * extra space reduced by the minimal required space for the * non-hotplug bridges. */ - remaining_io = available_io = resource_size(&io); - remaining_mmio = available_mmio = resource_size(&mmio); - remaining_mmio_pref = available_mmio_pref = resource_size(&mmio_pref); - for_each_pci_bridge(dev, bus) { - const struct resource *res; + resource_size_t used_size; + struct resource *res; if (dev->is_hotplug_bridge) continue; @@ -1940,24 +1952,39 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, * bridge and devices below it occupy. */ res = &dev->resource[PCI_BRIDGE_RESOURCES + 0]; - if (!res->parent && available_io > resource_size(res)) - remaining_io -= resource_size(res); + align = pci_resource_alignment(dev, res); + align = align ? ALIGN(io.start, align) - io.start : 0; + used_size = align + resource_size(res); + if (!res->parent) + io.start = min(io.start + used_size, io.end + 1); res = &dev->resource[PCI_BRIDGE_RESOURCES + 1]; - if (!res->parent && available_mmio > resource_size(res)) - remaining_mmio -= resource_size(res); + align = pci_resource_alignment(dev, res); + align = align ? ALIGN(mmio.start, align) - mmio.start : 0; + used_size = align + resource_size(res); + if (!res->parent) + mmio.start = min(mmio.start + used_size, mmio.end + 1); res = &dev->resource[PCI_BRIDGE_RESOURCES + 2]; - if (!res->parent && available_mmio_pref > resource_size(res)) - remaining_mmio_pref -= resource_size(res); + align = pci_resource_alignment(dev, res); + align = align ? ALIGN(mmio_pref.start, align) - + mmio_pref.start : 0; + used_size = align + resource_size(res); + if (!res->parent) + mmio_pref.start = min(mmio_pref.start + used_size, + mmio_pref.end + 1); } + io_per_hp = div64_ul(resource_size(&io), hotplug_bridges); + mmio_per_hp = div64_ul(resource_size(&mmio), hotplug_bridges); + mmio_pref_per_hp = div64_ul(resource_size(&mmio_pref), + hotplug_bridges); + /* * Go over devices on this bus and distribute the remaining * resource space between hotplug bridges. */ for_each_pci_bridge(dev, bus) { - resource_size_t align; struct pci_bus *b; b = dev->subordinate; @@ -1969,29 +1996,16 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, * hotplug-capable downstream ports taking alignment into * account. */ - align = pci_resource_alignment(bridge, io_res); - io_per_hp = div64_ul(available_io, hotplug_bridges); - io_per_hp = min(ALIGN(io_per_hp, align), remaining_io); - remaining_io -= io_per_hp; - - align = pci_resource_alignment(bridge, mmio_res); - mmio_per_hp = div64_ul(available_mmio, hotplug_bridges); - mmio_per_hp = min(ALIGN(mmio_per_hp, align), remaining_mmio); - remaining_mmio -= mmio_per_hp; - - align = pci_resource_alignment(bridge, mmio_pref_res); - mmio_pref_per_hp = div64_ul(available_mmio_pref, - hotplug_bridges); - mmio_pref_per_hp = min(ALIGN(mmio_pref_per_hp, align), - remaining_mmio_pref); - remaining_mmio_pref -= mmio_pref_per_hp; - io.end = io.start + io_per_hp - 1; mmio.end = mmio.start + mmio_per_hp - 1; mmio_pref.end = mmio_pref.start + mmio_pref_per_hp - 1; pci_bus_distribute_available_resources(b, add_list, io, mmio, mmio_pref); + + io.start += io_per_hp; + mmio.start += mmio_per_hp; + mmio_pref.start += mmio_pref_per_hp; } } |