diff options
Diffstat (limited to 'drivers/cpuidle/cpuidle-powernv.c')
| -rw-r--r-- | drivers/cpuidle/cpuidle-powernv.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c index 600bbe1a7aad..f7ca891b5b59 100644 --- a/drivers/cpuidle/cpuidle-powernv.c +++ b/drivers/cpuidle/cpuidle-powernv.c @@ -20,6 +20,8 @@ #include <asm/opal.h> #include <asm/runlatch.h> +#define POWERNV_THRESHOLD_LATENCY_NS 200000 + struct cpuidle_driver powernv_idle_driver = { .name = "powernv_idle", .owner = THIS_MODULE, @@ -27,6 +29,9 @@ struct cpuidle_driver powernv_idle_driver = { static int max_idle_state; static struct cpuidle_state *cpuidle_state_table; + +static u64 stop_psscr_table[CPUIDLE_STATE_MAX]; + static u64 snooze_timeout; static bool snooze_timeout_en; @@ -91,6 +96,17 @@ static int fastsleep_loop(struct cpuidle_device *dev, return index; } #endif + +static int stop_loop(struct cpuidle_device *dev, + struct cpuidle_driver *drv, + int index) +{ + ppc64_runlatch_off(); + power9_idle_stop(stop_psscr_table[index]); + ppc64_runlatch_on(); + return index; +} + /* * States for dedicated partition case. */ @@ -169,6 +185,8 @@ static int powernv_add_idle_states(void) u32 latency_ns[CPUIDLE_STATE_MAX]; u32 residency_ns[CPUIDLE_STATE_MAX]; u32 flags[CPUIDLE_STATE_MAX]; + u64 psscr_val[CPUIDLE_STATE_MAX]; + const char *names[CPUIDLE_STATE_MAX]; int i, rc; /* Currently we have snooze statically defined */ @@ -207,11 +225,34 @@ static int powernv_add_idle_states(void) pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-latencies-ns in DT\n"); goto out; } + if (of_property_read_string_array(power_mgt, + "ibm,cpu-idle-state-names", names, dt_idle_states) < 0) { + pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-names in DT\n"); + goto out; + } + + /* + * If the idle states use stop instruction, probe for psscr values + * which are necessary to specify required stop level. + */ + if (flags[0] & (OPAL_PM_STOP_INST_FAST | OPAL_PM_STOP_INST_DEEP)) + if (of_property_read_u64_array(power_mgt, + "ibm,cpu-idle-state-psscr", psscr_val, dt_idle_states)) { + pr_warn("cpuidle-powernv: missing ibm,cpu-idle-states-psscr in DT\n"); + goto out; + } rc = of_property_read_u32_array(power_mgt, "ibm,cpu-idle-state-residency-ns", residency_ns, dt_idle_states); for (i = 0; i < dt_idle_states; i++) { + /* + * If an idle state has exit latency beyond + * POWERNV_THRESHOLD_LATENCY_NS then don't use it + * in cpu-idle. + */ + if (latency_ns[i] > POWERNV_THRESHOLD_LATENCY_NS) + continue; /* * Cpuidle accepts exit_latency and target_residency in us. @@ -224,6 +265,16 @@ static int powernv_add_idle_states(void) powernv_states[nr_idle_states].flags = 0; powernv_states[nr_idle_states].target_residency = 100; powernv_states[nr_idle_states].enter = nap_loop; + } else if ((flags[i] & OPAL_PM_STOP_INST_FAST) && + !(flags[i] & OPAL_PM_TIMEBASE_STOP)) { + strncpy(powernv_states[nr_idle_states].name, + names[i], CPUIDLE_NAME_LEN); + strncpy(powernv_states[nr_idle_states].desc, + names[i], CPUIDLE_NAME_LEN); + powernv_states[nr_idle_states].flags = 0; + + powernv_states[nr_idle_states].enter = stop_loop; + stop_psscr_table[nr_idle_states] = psscr_val[i]; } /* @@ -239,6 +290,16 @@ static int powernv_add_idle_states(void) powernv_states[nr_idle_states].flags = CPUIDLE_FLAG_TIMER_STOP; powernv_states[nr_idle_states].target_residency = 300000; powernv_states[nr_idle_states].enter = fastsleep_loop; + } else if ((flags[i] & OPAL_PM_STOP_INST_DEEP) && + (flags[i] & OPAL_PM_TIMEBASE_STOP)) { + strncpy(powernv_states[nr_idle_states].name, + names[i], CPUIDLE_NAME_LEN); + strncpy(powernv_states[nr_idle_states].desc, + names[i], CPUIDLE_NAME_LEN); + + powernv_states[nr_idle_states].flags = CPUIDLE_FLAG_TIMER_STOP; + powernv_states[nr_idle_states].enter = stop_loop; + stop_psscr_table[nr_idle_states] = psscr_val[i]; } #endif powernv_states[nr_idle_states].exit_latency = |