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    • Lv Zheng's avatar
      ACPICA: Events: Introduce acpi_mask_gpe() to implement GPE masking mechanism · 2af52c2b
      Lv Zheng authored
      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=1102Signed-off-by: default avatarLv Zheng <lv.zheng@intel.com>
      Signed-off-by: default avatarBob Moore <robert.moore@intel.com>
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      2af52c2b
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