When the time comes to select a start address for the bridge window during the root bus rescan, it should be not just a lowest possible address: this window must cover all the underlying fixed and immovable BARs. The lowest address that satisfies this requirement is the .realloc_range field of struct pci_bus, which is calculated during the preparation to the rescan. Signed-off-by: Sergey Miroshnichenko <s.miroshnichenko@xxxxxxxxx> --- drivers/pci/bus.c | 2 +- drivers/pci/setup-res.c | 31 +++++++++++++++++++++++++++++-- 2 files changed, 30 insertions(+), 3 deletions(-) diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c index 8e40b3e6da77..a1efa87e31b9 100644 --- a/drivers/pci/bus.c +++ b/drivers/pci/bus.c @@ -192,7 +192,7 @@ static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res, * this is an already-configured bridge window, its start * overrides "min". */ - if (avail.start) + if (min_used < avail.start) min_used = avail.start; max = avail.end; diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index a1657a8bf93d..1570bbd620cd 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -248,9 +248,23 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, struct resource *res = dev->resource + resno; resource_size_t min; int ret; + resource_size_t start = (resource_size_t)-1; + resource_size_t end = 0; min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM; + if (dev->subordinate && resno >= PCI_BRIDGE_RESOURCES) { + struct pci_bus *child_bus = dev->subordinate; + int b_resno = resno - PCI_BRIDGE_RESOURCES; + struct resource *immovable_range = &child_bus->immovable_range[b_resno]; + + if (immovable_range->start < immovable_range->end) { + start = immovable_range->start; + end = immovable_range->end; + min = child_bus->realloc_range[b_resno].start; + } + } + /* * First, try exact prefetching match. Even if a 64-bit * prefetchable bridge window is below 4GB, we can't put a 32-bit @@ -262,7 +276,7 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, IORESOURCE_PREFETCH | IORESOURCE_MEM_64, pcibios_align_resource, dev); if (ret == 0) - return 0; + goto check_fixed; /* * If the prefetchable window is only 32 bits wide, we can put @@ -274,7 +288,7 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, IORESOURCE_PREFETCH, pcibios_align_resource, dev); if (ret == 0) - return 0; + goto check_fixed; } /* @@ -287,6 +301,19 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, ret = pci_bus_alloc_resource(bus, res, size, align, min, 0, pcibios_align_resource, dev); +check_fixed: + if (ret == 0 && start < end) { + if (res->start > start || res->end < end) { + dev_err(&bus->dev, "fixed area 0x%llx-0x%llx for %s doesn't fit in the allocated %pR (0x%llx-0x%llx)", + (unsigned long long)start, (unsigned long long)end, + dev_name(&dev->dev), + res, (unsigned long long)res->start, + (unsigned long long)res->end); + release_resource(res); + return -1; + } + } + return ret; } -- 2.23.0