static int __init pnv_init_idle_states(void)
{
supported_cpuidle_states = 0;
if (cpuidle_disable != IDLE_NO_OVERRIDE)
goto out;
pnv_probe_idle_states();
if (!(supported_cpuidle_states & OPAL_PM_SLEEP_ENABLED_ER1)) {
patch_instruction(
(unsigned int *)pnv_fastsleep_workaround_at_entry,
PPC_INST_NOP);
patch_instruction(
(unsigned int *)pnv_fastsleep_workaround_at_exit,
PPC_INST_NOP);
} else {
/*
* OPAL_PM_SLEEP_ENABLED_ER1 is set. It indicates that
* workaround is needed to use fastsleep. Provide sysfs
* control to choose how this workaround has to be applied.
*/
device_create_file(cpu_subsys.dev_root,
&dev_attr_fastsleep_workaround_applyonce);
}
pnv_alloc_idle_core_states();
/*
* For each CPU, record its PACA address in each of it's
* sibling thread's PACA at the slot corresponding to this
* CPU's index in the core.
*/
if (cpu_has_feature(CPU_FTR_POWER9_DD1)) {
int cpu;
pr_info("powernv: idle: Saving PACA pointers of all CPUs in their thread sibling PACA\n");
for_each_present_cpu(cpu) {
int base_cpu = cpu_first_thread_sibling(cpu);
int idx = cpu_thread_in_core(cpu);
int i;
for (i = 0; i < threads_per_core; i++) {
int j = base_cpu + i;
paca_ptrs[j]->thread_sibling_pacas[idx] =
paca_ptrs[cpu];
}
}
}
if (supported_cpuidle_states & OPAL_PM_NAP_ENABLED)
ppc_md.power_save = power7_idle;
out:
return 0;
}
static int __init pnv_init_idle_states(void)
{
struct device_node *power_mgt;
int dt_idle_states;
const __be32 *idle_state_flags;
u32 len_flags, flags;
int i;
supported_cpuidle_states = 0;
if (cpuidle_disable != IDLE_NO_OVERRIDE)
return 0;
if (!firmware_has_feature(FW_FEATURE_OPALv3))
return 0;
power_mgt = of_find_node_by_path("/ibm,opal/power-mgt");
if (!power_mgt) {
pr_warn("opal: PowerMgmt Node not found\n");
return 0;
}
idle_state_flags = of_get_property(power_mgt,
"ibm,cpu-idle-state-flags", &len_flags);
if (!idle_state_flags) {
pr_warn("DT-PowerMgmt: missing ibm,cpu-idle-state-flags\n");
return 0;
}
dt_idle_states = len_flags / sizeof(u32);
for (i = 0; i < dt_idle_states; i++) {
flags = be32_to_cpu(idle_state_flags[i]);
supported_cpuidle_states |= flags;
}
if (!(supported_cpuidle_states & OPAL_PM_SLEEP_ENABLED_ER1)) {
patch_instruction(
(unsigned int *)pnv_fastsleep_workaround_at_entry,
PPC_INST_NOP);
patch_instruction(
(unsigned int *)pnv_fastsleep_workaround_at_exit,
PPC_INST_NOP);
}
pnv_alloc_idle_core_states();
return 0;
}
