Oza Pawandeep 7e9084b367 PCI/AER: Handle ERR_FATAL with removal and re-enumeration of devices ... PCIe ERR_FATAL errors mean the Link is unreliable. Components on the Link may need to be reset to return to reliable operation (PCIe r4.0, sec 6.2.2). We previously handled these errors much differently depending on whether the platform supports Downstream Port Containment (DPC) (PCIe r4.0, sec 6.2.10) or not. The AER driver has historically logged the error details, called driver-supplied pci_error_handlers callbacks, and reset the Link. This reset downstream devices, but did not remove them from the PCI subsystem, re-enumerate them, or call their driver .remove() or .probe() methods. DPC is different because the hardware automatically disables the Link when it detects ERR_FATAL, which resets downstream devices. There's no opportunity for pci_error_handlers callbacks before resetting the Link. The DPC driver removes affected devices (which calls their driver .remove() methods), brings the Link back up, and re-enumerates (which calls driver .probe() methods). Align AER ERR_FATAL handling with DPC by resetting the Link in software, skipping the driver pci_error_handlers callbacks, removing the devices from the PCI subsystem, and re-enumerating. The idea is that drivers and devices should see the same behavior for ERR_FATAL events, regardless of whether they're handled by AER or DPC. Here are the basic ERR_FATAL recovery steps, showing the previous AER behavior, the AER behavior after this patch, and the DPC behavior: AER AER DPC previous new behavior -------- --- -------- Log error yes yes yes (minimal) drv.error_detected() yes no no Reset Link yes yes yes drv.mmio_enabled() yes no no drv.slot_reset() yes no no drv.resume() yes no no Remove PCI devices no yes yes (calls drv.remove()) Re-enumerate no yes yes (calls drv.probe()) N.B. With DPC, the Link reset happens before the driver .remove() calls, while with AER, the reset happens *after* the .remove() calls. The goal is to eventually do the reset before .remove() for AER as well. Signed-off-by: Oza Pawandeep <poza@codeaurora.org> [bhelgaas: changelog, squash doc patch into this, remove unused "result_data"] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Keith Busch <keith.busch@intel.com>		2018-05-17 16:44:13 -05:00
..
ABI	RTC for 4.17	2018-04-10 10:22:27 -07:00
accelerators	ocxl: Document the OCXL_IOCTL_GET_METADATA IOCTL	2018-03-02 13:02:15 +11:00
accounting
acpi	ACPI / LPIT: Add Low Power Idle Table (LPIT) support	2017-10-11 15:38:10 +02:00
admin-guide	ARM:	2018-04-09 11:42:31 -07:00
aoe
arm	MTD changes:	2018-04-06 12:15:41 -07:00
arm64	ARM:	2018-04-09 11:42:31 -07:00
auxdisplay
backlight
block	block, bfq: move debug blkio stats behind CONFIG_DEBUG_BLK_CGROUP	2017-11-14 20:13:33 -07:00
blockdev	SCSI misc on 20170907	2017-09-07 21:11:05 -07:00
bpf	bpf, doc: add description wrt native/bpf clang target and pointer size	2018-03-20 15:47:45 -07:00
bus-devices
cdrom	Documentation/cdrom: fix German sharp s in LaTex	2018-03-08 19:35:29 -07:00
cgroup-v1	page cache: use xa_lock	2018-04-11 10:28:39 -07:00
cma
connector
console
core-api	Documentation: Mention why %p prints ptrval	2018-03-23 12:42:18 -06:00
cpu-freq	cpufreq: Drop cpufreq_table_validate_and_show()	2018-04-10 08:40:45 +02:00
cpuidle	cpuidle: Add definition of residency to sysfs documentation	2018-04-09 13:44:37 +02:00
crypto	crypto: doc - clarify hash callbacks state machine	2018-03-31 01:33:02 +08:00
dev-tools	There's been a fair amount of activity in Documentation/ this time around:	2018-04-03 13:35:51 -07:00
device-mapper	dm verity: add 'check_at_most_once' option to only validate hashes once	2018-04-03 15:04:29 -04:00
devicetree	The large diff this time around is from the addition of a new clk driver	2018-04-13 15:51:06 -07:00
doc-guide	doc-guide: kernel-doc: add comment about formatting verification	2018-02-23 08:06:15 -07:00
driver-api	MTD changes:	2018-04-06 12:15:41 -07:00
driver-model	serdev: Introduce devm_serdev_device_open()	2018-01-08 10:08:34 +00:00
early-userspace
EDID
extcon
fault-injection	Documentation: nvme: Documentation for nvme fault injection	2018-03-26 08:53:43 -06:00
fb	documentation: fb: update list of available compiled-in fonts	2017-11-08 03:39:52 -07:00
features	arch: remove obsolete architecture ports	2018-04-02 20:20:12 -07:00
filesystems	Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs	2018-04-13 16:55:41 -07:00
firmware_class
fmc
fpga	fpga: mgr: separate getting/locking FPGA manager	2017-11-28 16:30:37 +01:00
gpio	Documentation: gpio: Move drivers-on-gpio.txt to driver-api	2018-03-23 04:22:29 +01:00
gpu	Linux 4.16-rc7	2018-03-28 14:30:41 +10:00
hid	Documentation: fix input related doc refs	2017-10-12 11:14:06 -06:00
hwmon	hwmon: (lm92) Add max6635 to lm92_id[]	2018-03-22 09:33:24 -07:00
i2c	i2c: i801: Add missing documentation entries for Braswell and Kaby Lake	2018-02-21 09:17:20 +01:00
ia64	ia64: doc: tweak whitespace for 'console=' parameter	2018-03-05 14:41:38 -08:00
ide
iio	iio: adc: New driver for Cirrus Logic EP93xx ADC	2017-07-25 19:56:23 +01:00
infiniband	Documentation/ABI: update infiniband sysfs interfaces	2018-02-23 08:18:33 -07:00
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2018-04-05 13:21:57 -07:00
ioctl	arch: remove tile port	2018-03-16 10:56:03 +01:00
isdn	Documentation/isdn: check and fix dead links ...	2018-03-26 12:31:13 -04:00
kbuild	Kconfig updates for v4.17	2018-04-03 16:28:01 -07:00
kdump
kernel-hacking	Documentation: Fix misconversion of #if	2018-01-17 16:45:01 -07:00
laptops	Documentation: fix admin-guide doc refs	2017-10-12 11:13:28 -06:00
leds	Documentation: leds: Update 00-INDEX file	2017-10-23 20:17:03 +02:00
lightnvm
livepatch	livepatch: Remove immediate feature	2018-01-11 10:58:03 +01:00
locking	Linux 4.16-rc2	2018-02-21 09:57:55 +01:00
m68k
maintainer	docs: Add an intro note to the maintainers handbook	2017-12-11 14:46:10 -07:00
md	raid5-ppl: PPL support for disks with write-back cache enabled	2018-01-15 14:29:42 -08:00
media	media: extended-controls.rst: transmitter -> receiver	2018-04-04 08:05:20 -04:00
memory-devices
mic
mips	Documentation: mips: Update AU1xxx_IDE Kconfig dependencies	2018-02-01 12:45:35 -07:00
misc-devices
mmc
mtd	mtd: spi-nor: add an API to restore the status of SPI flash chip	2017-12-13 00:36:00 +01:00
namespaces
netlabel
networking	Staging/IIO patches for 4.17-rc1	2018-04-04 18:56:27 -07:00
nfc
nios2
nvdimm
nvmem	NVMEM documentation fix: A minor typo	2017-08-24 13:31:58 -06:00
openrisc	Documentation: openrisc: Updates to README	2017-10-30 21:37:53 +09:00
parisc
PCI	PCI/AER: Handle ERR_FATAL with removal and re-enumeration of devices	2018-05-17 16:44:13 -05:00
pcmcia
perf	drivers/bus: Move Arm CCN PMU driver	2018-03-06 17:26:15 +01:00
phy
platform
power	PM / hibernate: Make passing hibernate offsets more friendly	2018-03-30 12:01:20 +02:00
powerpc
pps	drivers/pps: aesthetic tweaks to PPS-related content	2017-09-08 18:26:51 -07:00
process	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-04-15 16:12:35 -07:00
pti
ptp	ptp: Fix documentation to match code.	2018-03-26 12:13:21 -04:00
rapidio	Documentation: rapidio: move sysfs interface to ABI	2018-02-23 08:25:45 -07:00
RCU	Merge branches 'cond_resched.2017.12.04a', 'dyntick.2017.11.28a', 'fixes.2017.12.11a', 'srbd.2017.12.05a' and 'torture.2017.12.11a' into HEAD	2017-12-11 09:21:58 -08:00
s390	vfio-ccw: update documentation	2018-03-01 17:32:14 +01:00
scheduler	sched/deadline: Fix the description of runtime accounting in the documentation	2017-11-16 09:00:35 +01:00
scsi	scsi: documentation: Obsolete documentation references	2018-03-21 18:34:20 -04:00
security	selinux: Update SELinux SCTP documentation	2018-03-20 16:26:15 -04:00
serial
sh
sound	sound updates for 4.15-rc1	2017-11-14 18:01:46 -08:00
sparc	sparc64: Add support for ADI (Application Data Integrity)	2018-03-18 07:38:48 -07:00
sphinx	Documentation/sphinx: Fix Directive import error	2018-03-09 10:46:14 -07:00
sphinx-static	docs RTD theme: code-block with line nos - lines and line numbers don't line up.	2017-07-17 13:48:45 -06:00
spi
sysctl	taint: add taint for randstruct	2018-04-11 10:28:35 -07:00
target
thermal	thermal: Add cooling device's statistics in sysfs	2018-04-02 21:49:01 +08:00
timers	sched/isolation: Eliminate NO_HZ_FULL_ALL	2018-02-15 15:40:37 -08:00
trace	New features:	2018-04-10 11:27:30 -07:00
translations	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk	2018-02-01 13:36:15 -08:00
usb	Documentation updates for 4.16. New stuff includes refcount_t	2018-01-31 19:25:25 -08:00
userspace-api	seccomp: Implement SECCOMP_RET_KILL_PROCESS action	2017-08-14 13:46:50 -07:00
virtual	KVM: trivial documentation cleanups	2018-03-28 22:47:06 +02:00
vm	page cache: use xa_lock	2018-04-11 10:28:39 -07:00
w1	Documentation updates for 4.16. New stuff includes refcount_t	2018-01-31 19:25:25 -08:00
watchdog	watchdog: remove bfin_wdt driver	2018-03-26 15:57:04 +02:00
wimax
x86	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-04-15 16:12:35 -07:00
xtensa	xtensa: add support for KASAN	2017-12-16 22:37:12 -08:00
.gitignore
00-INDEX	CRIS: Drop support for the CRIS port	2018-03-16 10:56:05 +01:00
atomic_bitops.txt	locking/atomic/bitops: Document and clarify ordering semantics for failed test_and_{}_bit()	2018-02-13 14:55:53 +01:00
atomic_t.txt	Documentation/locking/atomic: Finish the document...	2017-08-25 11:06:33 +02:00
bcache.txt
bt8xxgpio.txt
btmrvl.txt
bus-virt-phys-mapping.txt
cachetlb.txt
cgroup-v2.txt	cgroup, docs: document the root cgroup behavior of cpu and io controllers	2018-01-16 08:07:09 -08:00
Changes
circular-buffers.txt	doc: De-emphasize smp_read_barrier_depends	2017-12-05 11:57:53 -08:00
clearing-warn-once.txt	kernel debug: support resetting WARN*_ONCE	2017-11-17 16:10:00 -08:00
clk.txt	Documentation: clk: enable lock is not held for clk_is_enabled API	2018-03-16 15:44:43 -07:00
CodingStyle
conf.py	docs: Remove "could not extract kernel version" warning	2017-12-11 15:20:04 -07:00
cpu-load.txt
cputopology.txt
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
digsig.txt
DMA-API-HOWTO.txt
DMA-API.txt	dma-coherent: remove the DMA_MEMORY_MAP and DMA_MEMORY_IO flags	2017-09-01 11:59:17 +02:00
DMA-attributes.txt
DMA-ISA-LPC.txt
docutils.conf
dontdiff	Remove gperf usage from toolchain	2017-08-19 11:02:53 -07:00
efi-stub.txt
eisa.txt
flexible-arrays.txt
futex-requeue-pi.txt
gcc-plugins.txt
highuid.txt
hw_random.txt
hwspinlock.txt
index.rst	Documentation: add Linux tracing to Sphinx TOC tree	2018-03-07 10:22:53 -07:00
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt	ipmi: Make IPMI panic strings always available	2017-09-27 16:03:45 -05:00
IRQ-affinity.txt
IRQ-domain.txt	irqdomain: Kill CONFIG_IRQ_DOMAIN_DEBUG	2018-01-24 12:32:58 +01:00
IRQ.txt
irqflags-tracing.txt
isa.txt
isapnp.txt
kernel-per-CPU-kthreads.txt
kobject.txt
kprobes.txt	kprobes/docs: Remove jprobes related documents	2017-10-20 11:02:55 +02:00
kref.txt
ldm.txt
lockup-watchdogs.txt
logo.gif
logo.txt
lsm.txt
lzo.txt
mailbox.txt
Makefile	Documentation: add script and build target to check for broken file references	2017-10-12 11:07:42 -06:00
memory-barriers.txt	locking/memory-barriers: De-emphasize smp_read_barrier_depends() some more	2018-03-10 10:22:22 +01:00
memory-hotplug.txt
men-chameleon-bus.txt
nommu-mmap.txt
ntb.txt
numastat.txt
padata.txt
parport-lowlevel.txt
percpu-rw-semaphore.txt
phy.txt
pi-futex.txt	Documentation: fix locking rt-mutex doc refs	2017-10-19 12:56:44 -06:00
pnp.txt
preempt-locking.txt
pwm.txt
rbtree.txt	rbtree: cache leftmost node internally	2017-09-08 18:26:48 -07:00
remoteproc.txt
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rtc.txt	Documentation: rtc: move iotcl interface documentation to ABI	2018-01-12 00:20:41 +01:00
SAK.txt
sgi-ioc4.txt
siphash.txt
SM501.txt
smsc_ece1099.txt
speculation.txt	Documentation: Document array_index_nospec	2018-01-30 21:54:28 +01:00
static-keys.txt	jump_label: Provide hotplug context variants	2017-08-10 12:28:59 +02:00
SubmittingPatches
svga.txt	documentation/svga.txt: update outdated file	2017-11-20 10:45:50 -07:00
switchtec.txt	NTB: switchtec_ntb: Update switchtec documentation with notes for NTB	2017-11-18 20:37:13 -05:00
sync_file.txt
tee.txt
this_cpu_ops.txt
unaligned-memory-access.txt
vfio-mediated-device.txt
vfio.txt
video-output.txt
xillybus.txt
xz.txt
zorro.txt