• Zhao Yakui's avatar
    IPMI/ACPI: Add the IPMI opregion driver to enable ACPI to access BMC controller · e92b297c
    Zhao Yakui authored
    ACPI 4.0 spec adds the ACPI IPMI opregion, which means that the ACPI AML
    code can also communicate with the BMC controller. This is to install
    the ACPI IPMI opregion and enable the ACPI to access the BMC controller
    through the IPMI message.
    
         It will create IPMI user interface for every IPMI device detected
    in ACPI namespace and install the corresponding IPMI opregion space handler.
    Then it can enable ACPI to access the BMC controller through the IPMI
    message.
    
    The following describes how to process the IPMI request in IPMI space handler:
        1. format the IPMI message based on the request in AML code.
        IPMI system address. Now the address type is SYSTEM_INTERFACE_ADDR_TYPE
        IPMI net function & command
        IPMI message payload
        2. send the IPMI message by using the function of ipmi_request_settime
        3. wait for the completion of IPMI message. It can be done in different
    routes: One is in handled in IPMI user recv callback function. Another is
    handled in timeout function.
        4. format the IPMI response and return it to ACPI AML code.
    
    At the same time it also addes the module dependency. The ACPI IPMI opregion
    will depend on the IPMI subsystem.
    Signed-off-by: default avatarZhao Yakui <yakui.zhao@intel.com>
    cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
    Signed-off-by: default avatarCorey Minyard <cminyard@mvista.com>
    Signed-off-by: default avatarLen Brown <len.brown@intel.com>
    e92b297c
acpi_ipmi.c 14.4 KB