• Lukas Wunner's avatar
    treewide: Consolidate Apple DMI checks · 630b3aff
    Lukas Wunner authored
    We're about to amend ACPI bus scan with DMI checks whether we're running
    on a Mac to support Apple device properties in AML.  The DMI checks are
    performed for every single device, adding overhead for everything x86
    that isn't Apple, which is the majority.  Rafael and Andy therefore
    request to perform the DMI match only once and cache the result.
    
    Outside of ACPI various other Apple DMI checks exist and it seems
    reasonable to use the cached value there as well.  Rafael, Andy and
    Darren suggest performing the DMI check in arch code and making it
    available with a header in include/linux/platform_data/x86/.
    
    To this end, add early_platform_quirks() to arch/x86/kernel/quirks.c
    to perform the DMI check and invoke it from setup_arch().  Switch over
    all existing Apple DMI checks, thereby fixing two deficiencies:
    
    * They are now #defined to false on non-x86 arches and can thus be
      optimized away if they're located in cross-arch code.
    
    * Some of them only match "Apple Inc." but not "Apple Computer, Inc.",
      which is used by BIOSes released between January 2006 (when the first
      x86 Macs started shipping) and January 2007 (when the company name
      changed upon introduction of the iPhone).
    Suggested-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
    Suggested-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    Suggested-by: default avatarDarren Hart <dvhart@infradead.org>
    Signed-off-by: default avatarLukas Wunner <lukas@wunner.de>
    Acked-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    630b3aff