diff options
Diffstat (limited to 'drivers/pci/setup-bus.c')
| -rw-r--r-- | drivers/pci/setup-bus.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index fd78606526ec..447f3aa1037c 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1146,7 +1146,6 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, min_align = calculate_mem_align(aligns, max_order); min_align = max(min_align, win_align); size0 = calculate_memsize(size, min_size, 0, 0, resource_size(b_res), min_align); - add_align = max(min_align, add_align); if (bus->self && size0 && !pbus_upstream_space_available(bus, mask | IORESOURCE_PREFETCH, type, @@ -1159,8 +1158,21 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, } if (realloc_head && (add_size > 0 || children_add_size > 0)) { + add_align = max(min_align, add_align); size1 = calculate_memsize(size, min_size, add_size, children_add_size, resource_size(b_res), add_align); + + if (bus->self && size1 && + !pbus_upstream_space_available(bus, mask | IORESOURCE_PREFETCH, type, + size1, add_align)) { + min_align = 1ULL << (max_order + __ffs(SZ_1M)); + min_align = max(min_align, win_align); + size1 = calculate_memsize(size, min_size, add_size, children_add_size, + resource_size(b_res), win_align); + pci_info(bus->self, + "bridge window %pR to %pR requires relaxed alignment rules\n", + b_res, &bus->busn_res); + } } if (!size0 && !size1) { |