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Bjorn Helgaas 54a7a9d75c PCI: Probe bridge window attributes once at enumeration-time 
commit 51c48b3101 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
..
accessibility
acpi ACPICA: Do not increment operation_region reference counts for field units 2020-08-19 08:14:53 +02:00
amba
android binder: Prevent context manager from incrementing ref 0 2020-08-11 15:32:31 +02:00
ata ata/libata: Fix usage of page address by page_address in ata_scsi_mode_select_xlat function 2020-06-30 23:17:13 -04:00
atm atm: fix atm_dev refcnt leaks in atmtcp_remove_persistent 2020-08-11 15:32:33 +02:00
auxdisplay
base regmap: debugfs: check count when read regmap file 2020-07-31 18:37:49 +02:00
bcma bcma: fix incorrect update of BCMA_CORE_PCI_MDIO_DATA 2020-01-27 14:51:09 +01:00
block loop: be paranoid on exit and prevent new additions / removals 2020-08-19 08:14:50 +02:00
bluetooth Bluetooth: hci_serdev: Only unregister device if it was registered 2020-08-19 08:15:00 +02:00
bus bus: sunxi-rsb: Return correct data when mixing 16-bit and 8-bit reads 2020-04-17 10:48:37 +02:00
cdrom
char agp/intel: Fix a memory leak on module initialisation failure 2020-08-19 08:14:53 +02:00
clk clk: scmi: Fix min and max rate when registering clocks with discrete rates 2020-08-19 08:14:49 +02:00
clocksource clocksource: dw_apb_timer_of: Fix missing clockevent timers 2020-06-22 09:05:11 +02:00
connector
cpufreq cpufreq: dt: fix oops on armada37xx 2020-08-19 08:15:06 +02:00
cpuidle cpuidle: Fix three reference count leaks 2020-06-22 09:05:20 +02:00
crypto crypto: cpt - don't sleep of CRYPTO_TFM_REQ_MAY_SLEEP was not specified 2020-08-19 08:15:05 +02:00
dax
dca
devfreq Revert "PM / devfreq: Modify the device name as devfreq(X) for sysfs" 2020-03-05 16:42:18 +01:00
dio
dma dmaengine: ioat setting ioat timeout as module parameter 2020-07-29 10:16:53 +02:00
dma-buf
edac EDAC: Fix reference count leaks 2020-08-19 08:14:48 +02:00
eisa
extcon extcon: adc-jack: Fix an error handling path in 'adc_jack_probe()' 2020-06-25 15:33:01 +02:00
firewire
firmware firmware: arm_scmi: Fix SCMI genpd domain probing 2020-08-19 08:14:48 +02:00
fmc
fpga fpga: dfl: fix bug in port reset handshake 2020-07-29 10:16:48 +02:00
fsi fsi: sbefifo: Don't fail operations when in SBE IPL state 2020-01-27 14:51:00 +01:00
gnss gnss: sirf: fix error return code in sirf_probe() 2020-06-22 09:05:28 +02:00
gpio gpio: arizona: put pm_runtime in case of failure 2020-07-29 10:16:44 +02:00
gpu drm/ttm/nouveau: don't call tt destroy callback on alloc failure. 2020-08-19 08:15:06 +02:00
hid HID: input: Fix devices that return multiple bytes in battery report 2020-08-19 08:14:47 +02:00
hsi
hv Drivers: hv: vmbus: Ignore CHANNELMSG_TL_CONNECT_RESULT(23) 2020-08-11 15:32:33 +02:00
hwmon hwmon: (scmi) Fix potential buffer overflow in scmi_hwmon_probe() 2020-07-29 10:16:54 +02:00
hwspinlock
hwtracing coresight: tmc: Fix TMC mode read in tmc_read_unprepare_etb() 2020-08-19 08:14:58 +02:00
i2c i2c: slave: add sanity check when unregistering 2020-08-11 15:32:33 +02:00
ide ide: serverworks: potential overflow in svwks_set_pio_mode() 2020-02-24 08:34:49 +01:00
idle
iio iio: imu: adis16400: fix memory leak 2020-08-05 10:05:59 +02:00
infiniband RDMA/core: Fix return error value in _ib_modify_qp() to negative 2020-08-19 08:14:59 +02:00
input Input: synaptics - enable InterTouch for ThinkPad X1E 1st gen 2020-07-29 10:16:53 +02:00
iommu irqdomain/treewide: Free firmware node after domain removal 2020-08-19 08:15:07 +02:00
ipack ipack: tpci200: fix error return code in tpci200_register() 2020-05-27 17:37:43 +02:00
irqchip genirq/affinity: Make affinity setting if activated opt-in 2020-08-21 11:05:28 +02:00
isdn PCI: add USR vendor id and use it in r8169 and w6692 driver 2020-06-22 09:05:23 +02:00
leds leds: core: Flush scheduled work for system suspend 2020-08-19 08:14:56 +02:00
lightnvm lightnvm: pblk: fix lock order in pblk_rb_tear_down_check 2020-01-27 14:50:45 +01:00
macintosh drivers/macintosh: Fix memleak in windfarm_pm112 driver 2020-06-22 09:05:29 +02:00
mailbox mailbox: qcom-apcs: fix max_register value 2020-01-27 14:51:14 +01:00
mcb
md bcache: fix super block seq numbers comparision in register_cache_set() 2020-08-19 08:14:53 +02:00
media media: exynos4-is: Add missed check for pinctrl_lookup_state() 2020-08-19 08:14:56 +02:00
memory memory: tegra: Don't invoke Tegra30+ specific memory timing setup on Tegra20 2020-01-27 14:50:13 +01:00
memstick
message scsi: mptscsih: Fix read sense data size 2020-07-16 08:17:23 +02:00
mfd mfd: wm8994: Fix driver operation if loaded as modules 2020-06-25 15:32:50 +02:00
misc cxl: Fix kobject memleak 2020-08-19 08:14:55 +02:00
mmc mmc: sdhci: do not enable card detect interrupt for gpio cd type 2020-07-22 09:32:04 +02:00
mtd mtd: rawnand: qcom: avoid write to unavailable register 2020-08-19 08:15:07 +02:00
mux
net drivers/net/wan/lapbether: Added needed_headroom and a skb->len check 2020-08-19 08:15:03 +02:00
nfc nfc: s3fwrn5: add missing release on skb in s3fwrn5_recv_frame 2020-08-05 10:06:05 +02:00
ntb NTB: perf: Fix race condition when run with ntb_test 2020-06-25 15:33:03 +02:00
nubus
nvdimm libnvdimm: Fix endian conversion issues 2020-06-07 13:17:53 +02:00
nvme nvme-rdma: assign completion vector correctly 2020-07-16 08:17:23 +02:00
nvmem nvmem: qfprom: remove incorrect write support 2020-06-10 21:35:00 +02:00
of of: of_mdio: Correct loop scanning logic 2020-07-22 09:32:03 +02:00
opp OPP: Fix missing debugfs supply directory for OPPs 2020-01-27 14:50:04 +01:00
oprofile
parisc parisc: mask out enable and reserved bits from sba imask 2020-08-19 08:15:07 +02:00
parport
pci PCI: Probe bridge window attributes once at enumeration-time 2020-08-21 11:05:29 +02:00
pcmcia
perf drivers/perf: hisi: Fix wrong value for all counters enable 2020-06-25 15:33:04 +02:00
phy phy: exynos5-usbdrd: Calibrating makes sense only for USB2.0 PHY 2020-08-19 08:14:57 +02:00
pinctrl pinctrl-single: fix pcs_parse_pinconf() return value 2020-08-19 08:15:02 +02:00
platform platform/x86: intel-vbtn: Fix return value check in check_acpi_dev() 2020-08-19 08:14:49 +02:00
pnp
power power: supply: check if calc_soc succeeded in pm860x_init_battery 2020-08-19 08:14:59 +02:00
powercap
pps
ps3
ptp ptp: free ptp device pin descriptors properly 2020-01-23 08:21:35 +01:00
pwm pwm: img: Call pm_runtime_put() in pm_runtime_get_sync() failed case 2020-06-25 15:32:51 +02:00
rapidio rapidio: fix an error in get_user_pages_fast() error handling 2020-05-27 17:37:43 +02:00
ras
regulator regualtor: pfuze100: correct sw1a/sw2 on pfuze3000 2020-06-30 23:17:10 -04:00
remoteproc remoteproc: Fix IDR initialisation in rproc_alloc() 2020-06-25 15:32:47 +02:00
reset reset: uniphier: Add SCSSI reset control for each channel 2020-02-24 08:34:44 +01:00
rpmsg rpmsg: glink: Remove chunk size word align warning 2020-04-13 10:45:16 +02:00
rtc rtc: 88pm860x: fix possible race condition 2020-04-23 10:30:18 +02:00
s390 s390/qeth: don't process empty bridge port events 2020-08-19 08:15:01 +02:00
sbus
scsi scsi: mesh: Fix panic after host or bus reset 2020-08-19 08:14:59 +02:00
sfi
sh
siox
slimbus slimbus: core: Fix mismatch in of_node_get/put 2020-07-22 09:32:07 +02:00
sn
soc soc: qcom: rpmh-rsc: Set suppress_bind_attrs flag 2020-08-19 08:14:50 +02:00
soundwire
spi spi: spidev: Align buffers for DMA 2020-08-19 08:15:06 +02:00
spmi
ssb
staging staging: rtl8192u: fix a dubious looking mask before a shift 2020-08-19 08:14:58 +02:00
target scsi: target: tcmu: Fix a use after free in tcmu_check_expired_queue_cmd() 2020-06-25 15:32:59 +02:00
tc
tee tee: optee: Fix compilation issue with nommu 2020-02-05 14:43:50 +00:00
thermal thermal: ti-soc-thermal: Fix reversed condition in ti_thermal_expose_sensor() 2020-08-19 08:14:58 +02:00
thunderbolt thunderbolt: Drop duplicated get_switch_at_route() 2020-05-27 17:37:40 +02:00
tty vt: Reject zero-sized screen buffer size. 2020-07-29 10:16:56 +02:00
uio uio_pdrv_genirq: fix use without device tree and no interrupt 2020-07-22 09:32:11 +02:00
usb USB: serial: cp210x: enable usb generic throttle/unthrottle 2020-08-19 08:15:04 +02:00
uwb
vfio vfio/mdev: Fix reference count leak in add_mdev_supported_type 2020-06-25 15:33:01 +02:00
vhost vhost/vsock: fix packet delivery order to monitoring devices 2020-05-27 17:37:32 +02:00
video video: pxafb: Fix the function used to balance a 'dma_alloc_coherent()' call 2020-08-19 08:14:54 +02:00
virt virt: vbox: Fix guest capabilities mask check 2020-07-22 09:32:10 +02:00
virtio virtio_balloon: prevent pfn array overflow 2020-02-24 08:34:54 +01:00
visorbus visorbus: fix uninitialized variable access 2020-02-24 08:34:47 +01:00
vlynq
vme vme: bridges: reduce stack usage 2020-02-24 08:34:47 +01:00
w1 w1: omap-hdq: cleanup to add missing newline for some dev_dbg 2020-06-22 09:05:30 +02:00
watchdog watchdog: da9062: No need to ping manually before setting timeout 2020-06-25 15:32:58 +02:00
xen xen/gntdev: Fix dmabuf import with non-zero sgt offset 2020-08-19 08:15:07 +02:00
zorro
Kconfig
Makefile