• Huang Ying's avatar
    ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMI notification type support · 81e88fdc
    Huang Ying authored
    Generic Hardware Error Source provides a way to report platform
    hardware errors (such as that from chipset). It works in so called
    "Firmware First" mode, that is, hardware errors are reported to
    firmware firstly, then reported to Linux by firmware. This way, some
    non-standard hardware error registers or non-standard hardware link
    can be checked by firmware to produce more valuable hardware error
    information for Linux.
    This patch adds POLL/IRQ/NMI notification types support.
    Because the memory area used to transfer hardware error information
    from BIOS to Linux can be determined only in NMI, IRQ or timer
    handler, but general ioremap can not be used in atomic context, so a
    special version of atomic ioremap is implemented for that.
    Known issue:
    - Error information can not be printed for recoverable errors notified
      via NMI, because printk is not NMI-safe. Will fix this via delay
      printing to IRQ context via irq_work or make printk NMI-safe.
    - adjust printk format per comments.
    Signed-off-by: default avatarHuang Ying <ying.huang@intel.com>
    Reviewed-by: default avatarAndi Kleen <ak@linux.intel.com>
    Signed-off-by: default avatarLen Brown <len.brown@intel.com>
vmalloc.c 62.7 KB