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linux/drivers/acpi
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Darren Hart 227718c8bb ACPI/APEI: Limit printable size of BERT table data 
[ Upstream commit 3f8dec1162 ]

Platforms with large BERT table data can trigger soft lockup errors
while attempting to print the entire BERT table data to the console at
boot:

  watchdog: BUG: soft lockup - CPU#160 stuck for 23s! [swapper/0:1]

Observed on Ampere Altra systems with a single BERT record of ~250KB.

The original bert driver appears to have assumed relatively small table
data. Since it is impractical to reassemble large table data from
interwoven console messages, and the table data is available in

  /sys/firmware/acpi/tables/data/BERT

limit the size for tables printed to the console to 1024 (for no reason
other than it seemed like a good place to kick off the discussion, would
appreciate feedback from existing users in terms of what size would
maintain their current usage model).

Alternatively, we could make printing a CONFIG option, use the
bert_disable boot arg (or something similar), or use a debug log level.
However, all those solutions require extra steps or change the existing
behavior for small table data. Limiting the size preserves existing
behavior on existing platforms with small table data, and eliminates the
soft lockups for platforms with large table data, while still making it
available.

Signed-off-by: Darren Hart <darren@os.amperecomputing.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-04-08 14:40:32 +02:00
..
acpica ACPICA: Avoid walking the ACPI Namespace if it is not there 2022-04-08 14:40:31 +02:00
apei ACPI/APEI: Limit printable size of BERT table data 2022-04-08 14:40:32 +02:00
arm64 ACPI/IORT: Check node revision for PMCG resources 2022-02-16 12:54:22 +01:00
dptf ACPI: DPTF: Fix reading of attributes 2021-08-04 12:46:39 +02:00
nfit ACPI: NFIT: Use fallback node id when numa info in NFIT table is incorrect 2021-10-06 15:55:46 +02:00
numa treewide: Change list_sort to use const pointers 2021-09-30 10:11:04 +02:00
pmic ACPI: PMIC: Fix intel_pmic_regs_handler() read accesses 2021-11-18 14:04:26 +01:00
x86 ACPI / x86: Add not-present quirk for the PCI0.SDHB.BRC1 device on the GPD win 2022-01-27 10:54:13 +01:00
ac.c ACPI: AC: Quirk GK45 to skip reading _PSR 2021-11-18 14:04:00 +01:00
acpi_adxl.c
acpi_amba.c ACPI: AMBA: Fix resource name in /proc/iomem 2021-07-20 16:05:49 +02:00
acpi_apd.c serial: 8250_dw: Add device HID for new AMD UART controller 2021-06-03 09:00:33 +02:00
acpi_cmos_rtc.c ACPI: cmos_rtc: Remove leftover ACPI_MODULE_NAME() 2020-09-25 18:25:51 +02:00
acpi_configfs.c ACPI: configfs: add missing check after configfs_register_default_group() 2021-03-04 11:38:22 +01:00
acpi_dbg.c ACPI: debug: don't allow debugging when ACPI is disabled 2020-10-16 17:58:52 +02:00
acpi_extlog.c ACPI / extlog: Check for RDMSR failure 2020-10-02 19:01:55 +02:00
acpi_ipmi.c
acpi_lpat.c
acpi_lpit.c
acpi_lpss.c drm next for 5.10-rc1 2020-10-15 10:46:16 -07:00
acpi_memhotplug.c mm/memory_hotplug: prepare passing flags to add_memory() and friends 2020-10-16 11:11:18 -07:00
acpi_pad.c ACPI: Use DEVICE_ATTR_<RW|RO|WO> macros 2021-07-14 16:56:12 +02:00
acpi_platform.c ACPI: platform: Remove ACPI_MODULE_NAME() 2020-09-25 18:25:51 +02:00
acpi_pnp.c ACPI: PNP: compare the string length in the matching_id() 2020-12-30 11:54:06 +01:00
acpi_processor.c ACPI: processor: remove comment regarding string _UID support 2020-10-16 18:11:27 +02:00
acpi_tad.c ACPI: Use DEVICE_ATTR_<RW|RO|WO> macros 2021-07-14 16:56:12 +02:00
acpi_video.c ACPI: video: Add quirk for the Dell Vostro 3350 2021-07-20 16:05:49 +02:00
acpi_watchdog.c
battery.c ACPI: battery: Add device HID and quirk for Microsoft Surface Go 3 2022-03-28 09:57:10 +02:00
bgrt.c ACPI: bgrt: Fix CFI violation 2021-07-14 16:56:12 +02:00
blacklist.c
bus.c ACPI: Change acpi_device_always_present() into acpi_device_override_status() 2022-01-27 10:54:13 +01:00
button.c ACPI: button: Add DMI quirk for Medion Akoya E2228T 2020-11-09 19:29:41 +01:00
container.c ACPI: container: Remove leftover ACPICA debug functionality 2020-09-25 18:25:51 +02:00
cppc_acpi.c ACPI: CPPC: Replace cppc_attr with kobj_attribute 2021-05-14 09:50:16 +02:00
custom_method.c ACPI: custom_method: fix a possible memory leak 2021-05-11 14:47:12 +02:00
debugfs.c ACPI: debugfs: Remove dead ACPICA debug code 2020-09-25 18:25:51 +02:00
device_pm.c ACPI: PM / fan: Put fan device IDs into separate header file 2021-07-14 16:56:11 +02:00
device_sysfs.c ACPI: Use DEVICE_ATTR_<RW|RO|WO> macros 2021-07-14 16:56:12 +02:00
dock.c ACPI: Use DEVICE_ATTR_<RW|RO|WO> macros 2021-07-14 16:56:12 +02:00
ec_sys.c
ec.c Revert "ACPI: PM: s2idle: Cancel wakeup before dispatching EC GPE" 2022-03-11 12:11:55 +01:00
event.c ACPI: Fix whitespace inconsistencies 2020-11-09 19:08:06 +01:00
evged.c ACPI: GED: fix -Wformat 2020-11-09 19:25:20 +01:00
fan.c ACPI: PM / fan: Put fan device IDs into separate header file 2021-07-14 16:56:11 +02:00
fan.h ACPI: PM / fan: Put fan device IDs into separate header file 2021-07-14 16:56:11 +02:00
glue.c
hed.c
internal.h ACPI: EC: Rework flushing of EC work while suspended to idle 2022-01-27 10:53:52 +01:00
ioapic.c
irq.c
Kconfig ACPI: Kconfig: Fix table override from built-in initrd 2021-07-28 14:35:39 +02:00
Makefile ACPI: tables: Add custom DSDT file as makefile prerequisite 2021-07-14 16:56:01 +02:00
nvs.c
osi.c
osl.c ACPI: OSL: Make ACPICA use logical addresses of GPE blocks 2020-09-11 16:45:00 +02:00
pci_irq.c ACPI: Fix whitespace inconsistencies 2020-11-09 19:08:06 +01:00
pci_link.c ACPI: Fix whitespace inconsistencies 2020-11-09 19:08:06 +01:00
pci_mcfg.c ACPI: Fix whitespace inconsistencies 2020-11-09 19:08:06 +01:00
pci_root.c Merge branches 'acpi-extlog', 'acpi-memhotplug', 'acpi-button', 'acpi-tools' and 'acpi-pci' 2020-10-13 14:45:36 +02:00
pci_slot.c ACPI: PCI: Remove unused ACPICA debug code 2020-09-25 18:25:51 +02:00
power.c ACPI: Use DEVICE_ATTR_<RW|RO|WO> macros 2021-07-14 16:56:12 +02:00
pptt.c
proc.c ACPI: proc: Remove dead ACPICA debug code 2020-09-25 18:25:51 +02:00
processor_core.c ACPI: processor: Remove dead ACPICA debug code 2020-09-25 18:25:51 +02:00
processor_driver.c
processor_idle.c ACPI: processor idle: Fix up C-state latency if not ordered 2021-07-14 16:55:57 +02:00
processor_pdc.c
processor_perflib.c ACPI: Fix whitespace inconsistencies 2020-11-09 19:08:06 +01:00
processor_thermal.c ACPI: processor: Remove dead ACPICA debug code 2020-09-25 18:25:51 +02:00
processor_throttling.c
property.c ACPI: properties: Consistently return -ENOENT if there are no more references 2022-04-08 14:39:55 +02:00
reboot.c ACPI: reboot: Avoid racing after writing to ACPI RESET_REG 2020-10-16 18:04:52 +02:00
resource.c Revert "ACPI: resources: Add checks for ACPI IRQ override" 2021-08-04 12:46:39 +02:00
sbs.c ACPI: Fix whitespace inconsistencies 2020-11-09 19:08:06 +01:00
sbshc.c ACPI: Fix whitespace inconsistencies 2020-11-09 19:08:06 +01:00
sbshc.h ACPI: Fix whitespace inconsistencies 2020-11-09 19:08:06 +01:00
scan.c ACPI: scan: Create platform device for BCM4752 and LNV4752 ACPI nodes 2022-01-27 10:54:00 +01:00
sleep.c Revert "ACPI: PM: s2idle: Cancel wakeup before dispatching EC GPE" 2022-03-11 12:11:55 +01:00
sleep.h
spcr.c ACPI: Use fallthrough pseudo-keyword 2020-07-09 14:09:28 +02:00
sysfs.c Merge back sysfs-related ACPI material for v5.9. 2020-06-29 13:49:49 +02:00
tables.c ACPI: tables: x86: Reserve memory occupied by ACPI tables 2021-04-07 15:00:08 +02:00
thermal.c ACPI: thermal: Do not call acpi_thermal_check() directly 2021-02-03 23:28:37 +01:00
tiny-power-button.c ACPI: tiny-power-button: Remove dead ACPICA debug code 2020-09-25 18:25:51 +02:00
utils.c ACPI: utils: remove unreachable breaks 2020-10-22 18:58:26 +02:00
video_detect.c ACPI: video: Force backlight native for Clevo NL5xRU and NL5xNU 2022-03-28 09:57:10 +02:00
wakeup.c ACPI: Fix whitespace inconsistencies 2020-11-09 19:08:06 +01:00