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authorLv Zheng <lv.zheng@intel.com>2016-08-04 10:43:39 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-08-13 03:09:33 +0200
commit2af52c2bd20c50e80b121e15cd50a579e364485a (patch)
tree3bc9e680c4c65462569794ce2ce5c269d2767c38 /include/video/cvisionppc.h
parentACPICA: Use os_allocate_zeroed (diff)
downloadlinux-2af52c2bd20c50e80b121e15cd50a579e364485a.tar.xz
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ACPICA: Events: Introduce acpi_mask_gpe() to implement GPE masking mechanism
ACPICA commit 23a417ca406a527e7ae1710893e59a8b6db30e14 There is a facility in Linux, developers can control the enabling/disabling of a GPE via /sys/firmware/acpi/interrupts/gpexx. This is mainly for debugging purposes. But many users expect to use this facility to implement quirks to mask a specific GPE when there is a gap in Linux causing this GPE to flood. This is not working correctly because currently this facility invokes enabling/disabling counting based GPE driver APIs: acpi_enable_gpe()/acpi_disable_gpe() and the GPE drivers can still affect the count to mess up the GPE masking purposes. However, most of the IRQ chip designs allow masking/unmasking IRQs via a masking bit which is different from the enabled bit to achieve the same purpose. But the GPE hardware doesn't contain such a feature, this brings the trouble. In this patch, we introduce a software mechanism to implement the GPE masking feature, and acpi_mask_gpe() are provided to the OSPMs to mask/unmask GPEs in the above mentioned situation instead of acpi_enable_gpe()/acpi_disable_gpe(). ACPICA BZ 1102. Lv Zheng. Link: https://github.com/acpica/acpica/commit/23a417ca Link: https://bugs.acpica.org/show_bug.cgi?id=1102 Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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