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authorLv Zheng <lv.zheng@intel.com>2016-12-16 12:07:57 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-12-26 23:16:39 +0100
commit9c4aa1eecb48cfac18ed5e3aca9d9ae58fbafc11 (patch)
tree09090669e6210c5cacb16bc8af2048ba94ec8793 /Documentation
parent7ce7d89f48834cefece7804d38fc5d85382edf77 (diff)
downloadlinux-9c4aa1eecb48cfac18ed5e3aca9d9ae58fbafc11.tar.bz2
ACPI / sysfs: Provide quirk mechanism to prevent GPE flooding
Sometimes, the users may require a quirk to be provided from ACPI subsystem core to prevent a GPE from flooding. Normally, if a GPE cannot be dispatched, ACPICA core automatically prevents the GPE from firing. But there are cases the GPE is dispatched by _Lxx/_Exx provided via AML table, and OSPM is lacking of the knowledge to get _Lxx/_Exx correctly executed to handle the GPE, thus the GPE flooding may still occur. The existing quirk mechanism can be enabled/disabled using the following commands to prevent such kind of GPE flooding during runtime: # echo mask > /sys/firmware/acpi/interrupts/gpe00 # echo unmask > /sys/firmware/acpi/interrupts/gpe00 To avoid GPE flooding during boot, we need a boot stage mechanism. This patch provides such a boot stage quirk mechanism to stop this kind of GPE flooding. This patch doesn't fix any feature gap but since the new feature gaps could be found in the future endlessly, and can disappear if the feature gaps are filled, providing a boot parameter rather than a DMI table should suffice. Link: https://bugzilla.kernel.org/show_bug.cgi?id=53071 Link: https://bugzilla.kernel.org/show_bug.cgi?id=117481 Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/887793 Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/admin-guide/kernel-parameters.txt10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 21e2d8863705..d1eec5ed1134 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -106,6 +106,16 @@
use by PCI
Format: <irq>,<irq>...
+ acpi_mask_gpe= [HW,ACPI]
+ Due to the existence of _Lxx/_Exx, some GPEs triggered
+ by unsupported hardware/firmware features can result in
+ GPE floodings that cannot be automatically disabled by
+ the GPE dispatcher.
+ This facility can be used to prevent such uncontrolled
+ GPE floodings.
+ Format: <int>
+ Support masking of GPEs numbered from 0x00 to 0x7f.
+
acpi_no_auto_serialize [HW,ACPI]
Disable auto-serialization of AML methods
AML control methods that contain the opcodes to create