c2077e2c "pci: Adjust PCI config limit based on bus topology"
introduced checking the availability of extended config space for
PCI-E devices which are in a bus topology that doesn't permit extended
config space access (e.g. under PCI-E to PCI then PCI to PCI-E
bridges).
This caused some problems for the spapr para-virtual PCI bus which
_does_ allow extended config space access, despite acting in most ways
like a vanilla PCI bus.
Greg Kurz made a fix for that which was merged as 1c685a90263 "pci:
Allow PCI bus subtypes to support extended config space accesses".
While that was an appropriate minimal fix for the 4.0 hard freeze, it
was kind of a hack longer term.
This series implements a simpler way of handling the extended config
space permission, which works for both the normal and weird-PAPR
cases. While we're there, we also make other small cleanups to the
PCI code.
David Gibson (3):
pcie: Remove redundant test in pcie_mmcfg_data_{read,write}()
pci: Simplify pci_bus_is_root()
pcie: Simplify pci_adjust_config_limit()
hw/pci-bridge/pci_expander_bridge.c | 6 ----
hw/pci/pci.c | 55 +++++++++++++----------------
hw/pci/pci_host.c | 13 ++-----
hw/pci/pcie_host.c | 10 ------
hw/ppc/spapr_pci.c | 34 ++++++------------
hw/virtio/virtio-pci.c | 1 +
include/hw/pci/pci.h | 2 --
include/hw/pci/pci_bus.h | 21 +++++++++--
8 files changed, 58 insertions(+), 84 deletions(-)
--
2.20.1
