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authorLv Zheng <lv.zheng@intel.com>2016-12-16 07:07:57 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-12-27 01:16:39 +0300
commit9c4aa1eecb48cfac18ed5e3aca9d9ae58fbafc11 (patch)
tree09090669e6210c5cacb16bc8af2048ba94ec8793 /drivers/acpi/scan.c
parent7ce7d89f48834cefece7804d38fc5d85382edf77 (diff)
downloadlinux-9c4aa1eecb48cfac18ed5e3aca9d9ae58fbafc11.tar.xz
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 'drivers/acpi/scan.c')
-rw-r--r--drivers/acpi/scan.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 45dec874ea55..192691880d55 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -2074,6 +2074,7 @@ int __init acpi_scan_init(void)
}
}
+ acpi_gpe_apply_masked_gpes();
acpi_update_all_gpes();
acpi_ec_ecdt_start();