Bjorn Helgaas 54a7a9d75c PCI: Probe bridge window attributes once at enumeration-time ... commit 51c48b310183ab6ba5419edfc6a8de889cc04521 upstream. pci_bridge_check_ranges() determines whether a bridge supports the optional I/O and prefetchable memory windows and sets the flag bits in the bridge resources. This *could* be done once during enumeration except that the resource allocation code completely clears the flag bits, e.g., in the pci_assign_unassigned_bridge_resources() path. The problem with pci_bridge_check_ranges() in the resource allocation path is that we may allocate resources after devices have been claimed by drivers, and pci_bridge_check_ranges() *changes* the window registers to determine whether they're writable. This may break concurrent accesses to devices behind the bridge. Add a new pci_read_bridge_windows() to determine whether a bridge supports the optional windows, call it once during enumeration, remember the results, and change pci_bridge_check_ranges() so it doesn't touch the bridge windows but sets the flag bits based on those remembered results. Link: https://lore.kernel.org/linux-pci/1506151482-113560-1-git-send-email-wangzhou1@hisilicon.com Link: https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg02082.html Reported-by: Yandong Xu <xuyandong2@huawei.com> Tested-by: Yandong Xu <xuyandong2@huawei.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Sagi Grimberg <sagi@grimberg.me> Cc: Ofer Hayut <ofer@lightbitslabs.com> Cc: Roy Shterman <roys@lightbitslabs.com> Cc: Keith Busch <keith.busch@intel.com> Cc: Zhou Wang <wangzhou1@hisilicon.com> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=208371 Signed-off-by: Dima Stepanov <dimastep@yandex-team.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-08-21 11:05:29 +02:00
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controller	PCI: qcom: Add support for tx term offset for rev 2.1.0	2020-08-21 11:05:29 +02:00
endpoint	PCI: endpoint: Fix for concurrent memory allocation in OB address region	2020-04-17 10:48:46 +02:00
hotplug	PCI: hotplug: ACPI: Fix context refcounting in acpiphp_grab_context()	2020-08-21 11:05:29 +02:00
pcie	PCI/ASPM: Add missing newline in sysfs 'policy'	2020-08-19 08:14:58 +02:00
switch
access.c	PCI: Fix pci_cfg_wait queue locking problem	2020-08-19 08:14:56 +02:00
ats.c
bus.c	PCI: Add device even if driver attach failed	2020-08-21 11:05:29 +02:00
ecam.c
host-bridge.c
iov.c
irq.c
Kconfig
Makefile
mmap.c
msi.c
of.c
pci-acpi.c
pci-driver.c
pci-label.c
pci-mid.c
pci-pf-stub.c
pci-stub.c
pci-sysfs.c
pci.c
pci.h
probe.c	PCI: Probe bridge window attributes once at enumeration-time	2020-08-21 11:05:29 +02:00
proc.c
quirks.c	PCI: Mark AMD Navi10 GPU rev 0x00 ATS as broken	2020-08-21 11:05:29 +02:00
remove.c
rom.c
search.c
setup-bus.c	PCI: Probe bridge window attributes once at enumeration-time	2020-08-21 11:05:29 +02:00
setup-irq.c
setup-res.c	PCI: Allow pci_resize_resource() for devices on root bus	2020-06-25 15:32:48 +02:00
slot.c
syscall.c
vc.c
vpd.c
xen-pcifront.c