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spapr_rtas: add get-sensor-state RTAS interface 

This interface allows a guest to read various platform/device sensors.
initially, we only implement support necessary to support hotplug:
reading of the dr-entity-sense sensor, which communicates the state of
a hotplugged resource/device to the guest (EMPTY/PRESENT/UNUSABLE).

See docs/specs/ppc-spapr-hotplug.txt for a complete description of
this interface.

Signed-off-by: Mike Day <ncmike@ncultra.org>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Mike Day 2015-05-07 15:33:46 +10:00 committed by Alexander Graf
parent 8c8639df32
commit 886445a6ee
1 changed files with 43 additions and 0 deletions
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43
hw/ppc/spapr_rtas.c
View File

@ -377,6 +377,47 @@ out_unimplemented:
rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
}
static void rtas_get_sensor_state(PowerPCCPU *cpu, sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args, uint32_t nret,
target_ulong rets)
{
uint32_t sensor_type;
uint32_t sensor_index;
sPAPRDRConnector *drc;
sPAPRDRConnectorClass *drck;
uint32_t entity_sense;
if (nargs != 2 || nret != 2) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
sensor_type = rtas_ld(args, 0);
sensor_index = rtas_ld(args, 1);
if (sensor_type != RTAS_SENSOR_TYPE_ENTITY_SENSE) {
/* currently only DR-related sensors are implemented */
DPRINTF("rtas_get_sensor_state: sensor/indicator not implemented: %d\n",
sensor_type);
rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
return;
}
drc = spapr_dr_connector_by_index(sensor_index);
if (!drc) {
DPRINTF("rtas_get_sensor_state: invalid sensor/DRC index: %xh\n",
sensor_index);
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
entity_sense = drck->entity_sense(drc);
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
rtas_st(rets, 1, entity_sense);
}
static struct rtas_call {
const char *name;
spapr_rtas_fn fn;
@ -508,6 +549,8 @@ static void core_rtas_register_types(void)
rtas_get_power_level);
spapr_rtas_register(RTAS_SET_INDICATOR, "set-indicator",
rtas_set_indicator);
spapr_rtas_register(RTAS_GET_SENSOR_STATE, "get-sensor-state",
rtas_get_sensor_state);
}
type_init(core_rtas_register_types)