On Thursday, November 21, 2013 05:41:49 PM al.stone@xxxxxxxxxx wrote: > From: Al Stone <al.stone@xxxxxxxxxx> > > This series of patches starts with Hanjun's patch to create a kernel > config item for CONFIG_ACPI_REDUCED_HARDWARE [0]. Building on that, I > then reviewed all of the code that touched any of several fields in the > FADT that the OSPM is supposed to ignore when ACPI is in Hardware Reduced > mode [1]. Any time there was a use of one of the fields to be ignored, > I evaluated whether or not the code was implementing Hardware Reduced > mode correctly. Similarly, for each the flags in the FADT flags field > that are to be ignored in Hardware Reduced mode, the kernel code was again > scanned for proper usage. The remainder of the patches are to fix all of > the situations I could find where the kernel would not behave correctly > in this ACPI mode. > > These seem to work just fine on the RTSM model for ARMv7, both with and > without ACPI enabled, and with and without ACPI_REDUCED_HARDWARE enabled; > similarly for the FVP model for ARMv8. The patches for ACPI on ARM > hardware will be coming later but they presume that reduced HW mode is > functioning correctly. In the meantime, there's no way I can think of > to test all possible scenarios so feedback would be greatly appreciated. > > > [0] List at https://wiki.linaro.org/LEG/Engineering/Kernel/ACPI/AcpiReducedHw#Section_5:_ACPI_Software_Programming_Model > [1] Please see the ACPI Specification v5.0 for details on Hardware Reduced > mode. > > > Changes for v2: > -- Remove patch that was outside of reduced HW mode changes > -- Simplify CONFIG_ACPI_REDUCED_HARDWARE in Kconfig > -- Simplify use of CONFIG_ACPI_REDUCED_HARDWARE in #ifdefs > -- Ensure changelogs are present > -- Combine and simplify previous patches 8 & 10 > > > Al Stone (6): > ACPI: introduce CONFIG_ACPI_REDUCED_HARDWARE to enable this ACPI mode > ACPI: bus master reload not supported in reduced HW mode > ACPI: HW reduced mode does not allow use of the FADT sci_interrupt > field > ACPI: ARM: exclude DMI calls > ACPI: do not reserve memory regions for some FADT entries in HW > reduced mode > ACPI: in HW reduced mode, using FADT PM information is not allowed. As Olof noted in another thread, all ACPI patches related to ARM should be CCed to linux-arm-kernel. Can you please do that in the future? Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
