Commit 094d2058 authored by Nathan Fontenot's avatar Nathan Fontenot Committed by Alexander Graf
Browse files

spapr_rtas: add get/set-power-level RTAS interfaces 



These interfaces manage the power domains that guest devices are
assigned to and are used to power on/off devices. Currently we
only utilize 1 power domain, the 'live-insertion' domain, which
automates power management of plugged/unplugged devices, essentially
making these calls no-ops, but the RTAS interfaces are still required
by guest hotplug code and PAPR+.

See docs/specs/ppc-spapr-hotplug.txt for a complete description of
these interfaces.

Signed-off-by: default avatarNathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Roth <mdroth@linux.vnet.ibm.com>
Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent bbf5c878

hw/ppc/spapr_rtas.c

+54 −0
Original line number Diff line number Diff line
@@ -245,6 +245,56 @@ static void rtas_ibm_os_term(PowerPCCPU *cpu, 
    rtas_st(rets, 0, ret);

}



static void rtas_set_power_level(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                                 uint32_t token, uint32_t nargs,

                                 target_ulong args, uint32_t nret,

                                 target_ulong rets)

{

    int32_t power_domain;



    if (nargs != 2 || nret != 2) {

        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);

        return;

    }



    /* we currently only use a single, "live insert" powerdomain for

     * hotplugged/dlpar'd resources, so the power is always live/full (100)

     */

    power_domain = rtas_ld(args, 0);

    if (power_domain != -1) {

        rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);

        return;

    }



    rtas_st(rets, 0, RTAS_OUT_SUCCESS);

    rtas_st(rets, 1, 100);

}



static void rtas_get_power_level(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                                  uint32_t token, uint32_t nargs,

                                  target_ulong args, uint32_t nret,

                                  target_ulong rets)

{

    int32_t power_domain;



    if (nargs != 1 || nret != 2) {

        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);

        return;

    }



    /* we currently only use a single, "live insert" powerdomain for

     * hotplugged/dlpar'd resources, so the power is always live/full (100)

     */

    power_domain = rtas_ld(args, 0);

    if (power_domain != -1) {

        rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);

        return;

    }



    rtas_st(rets, 0, RTAS_OUT_SUCCESS);

    rtas_st(rets, 1, 100);

}



static struct rtas_call {

    const char *name;

    spapr_rtas_fn fn;
@@ -370,6 +420,10 @@ static void core_rtas_register_types(void) 
                        rtas_ibm_set_system_parameter);

    spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term",

                        rtas_ibm_os_term);

    spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level",

                        rtas_set_power_level);

    spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level",

                        rtas_get_power_level);

}



type_init(core_rtas_register_types)