From 8c838a8233c3862a6953eb23b041143a98110a9f Mon Sep 17 00:00:00 2001 From: Marcel Apfelbaum Date: Wed, 24 Jun 2015 13:53:24 +0200 Subject: [PATCH 15/31] hw/pci: extend PCI config access to support devices behind PXB Message-id: <1435154016-26233-32-git-send-email-marcel@redhat.com> Patchwork-id: 66463 O-Subject: [RHEL-7.2 qemu-kvm-rhev PATCH 31/43] hw/pci: extend PCI config access to support devices behind PXB Bugzilla: 1103313 RH-Acked-by: Laszlo Ersek RH-Acked-by: Michael S. Tsirkin RH-Acked-by: Igor Mammedov PXB buses are assumed to be children of bus 0. Look for them while scanning the buses. Signed-off-by: Marcel Apfelbaum Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Acked-by: Laszlo Ersek (cherry picked from commit 09e5b81922179b6c52b42fd27587e64b474036c7) Signed-off-by: Miroslav Rezanina --- hw/pci/pci.c | 34 +++++++++++++++++++++++++++++----- 1 file changed, 29 insertions(+), 5 deletions(-) diff --git a/hw/pci/pci.c b/hw/pci/pci.c index ca6a708..38a9cb4 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -1714,10 +1714,28 @@ static bool pci_secondary_bus_in_range(PCIDevice *dev, int bus_num) { return !(pci_get_word(dev->config + PCI_BRIDGE_CONTROL) & PCI_BRIDGE_CTL_BUS_RESET) /* Don't walk the bus if it's reset. */ && - dev->config[PCI_SECONDARY_BUS] < bus_num && + dev->config[PCI_SECONDARY_BUS] <= bus_num && bus_num <= dev->config[PCI_SUBORDINATE_BUS]; } +/* Whether a given bus number is in a range of a root bus */ +static bool pci_root_bus_in_range(PCIBus *bus, int bus_num) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(bus->devices); ++i) { + PCIDevice *dev = bus->devices[i]; + + if (dev && PCI_DEVICE_GET_CLASS(dev)->is_bridge) { + if (pci_secondary_bus_in_range(dev, bus_num)) { + return true; + } + } + } + + return false; +} + static PCIBus *pci_find_bus_nr(PCIBus *bus, int bus_num) { PCIBus *sec; @@ -1739,12 +1757,18 @@ static PCIBus *pci_find_bus_nr(PCIBus *bus, int bus_num) /* try child bus */ for (; bus; bus = sec) { QLIST_FOREACH(sec, &bus->child, sibling) { - assert(!pci_bus_is_root(sec)); - if (sec->parent_dev->config[PCI_SECONDARY_BUS] == bus_num) { + if (pci_bus_num(sec) == bus_num) { return sec; } - if (pci_secondary_bus_in_range(sec->parent_dev, bus_num)) { - break; + /* PXB buses assumed to be children of bus 0 */ + if (pci_bus_is_root(sec)) { + if (pci_root_bus_in_range(sec, bus_num)) { + break; + } + } else { + if (pci_secondary_bus_in_range(sec->parent_dev, bus_num)) { + break; + } } } } -- 1.8.3.1