Commit 1961acad authored by Akshay Adiga's avatar Akshay Adiga Committed by Michael Ellerman

powernv/cpuidle: Use parsed device tree values for cpuidle_init

Export pnv_idle_states and nr_pnv_idle_states so that its accessible to
cpuidle driver. Use properties from pnv_idle_states structure for powernv
cpuidle_init.
Signed-off-by: default avatarAkshay Adiga <akshay.adiga@linux.vnet.ibm.com>
Reviewed-by: default avatarNicholas Piggin <npiggin@gmail.com>
Reviewed-by: default avatarGautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 9c7b185a
...@@ -90,6 +90,8 @@ struct pnv_idle_states_t { ...@@ -90,6 +90,8 @@ struct pnv_idle_states_t {
bool valid; bool valid;
}; };
extern struct pnv_idle_states_t *pnv_idle_states;
extern int nr_pnv_idle_states;
extern u32 pnv_fastsleep_workaround_at_entry[]; extern u32 pnv_fastsleep_workaround_at_entry[];
extern u32 pnv_fastsleep_workaround_at_exit[]; extern u32 pnv_fastsleep_workaround_at_exit[];
......
...@@ -242,6 +242,7 @@ static inline void add_powernv_state(int index, const char *name, ...@@ -242,6 +242,7 @@ static inline void add_powernv_state(int index, const char *name,
powernv_states[index].target_residency = target_residency; powernv_states[index].target_residency = target_residency;
powernv_states[index].exit_latency = exit_latency; powernv_states[index].exit_latency = exit_latency;
powernv_states[index].enter = idle_fn; powernv_states[index].enter = idle_fn;
/* For power8 and below psscr_* will be 0 */
stop_psscr_table[index].val = psscr_val; stop_psscr_table[index].val = psscr_val;
stop_psscr_table[index].mask = psscr_mask; stop_psscr_table[index].mask = psscr_mask;
} }
...@@ -263,186 +264,80 @@ static inline int validate_dt_prop_sizes(const char *prop1, int prop1_len, ...@@ -263,186 +264,80 @@ static inline int validate_dt_prop_sizes(const char *prop1, int prop1_len,
extern u32 pnv_get_supported_cpuidle_states(void); extern u32 pnv_get_supported_cpuidle_states(void);
static int powernv_add_idle_states(void) static int powernv_add_idle_states(void)
{ {
struct device_node *power_mgt;
int nr_idle_states = 1; /* Snooze */ int nr_idle_states = 1; /* Snooze */
int dt_idle_states, count; int dt_idle_states;
u32 latency_ns[CPUIDLE_STATE_MAX];
u32 residency_ns[CPUIDLE_STATE_MAX];
u32 flags[CPUIDLE_STATE_MAX];
u64 psscr_val[CPUIDLE_STATE_MAX];
u64 psscr_mask[CPUIDLE_STATE_MAX];
const char *names[CPUIDLE_STATE_MAX];
u32 has_stop_states = 0; u32 has_stop_states = 0;
int i, rc; int i;
u32 supported_flags = pnv_get_supported_cpuidle_states(); u32 supported_flags = pnv_get_supported_cpuidle_states();
/* Currently we have snooze statically defined */ /* Currently we have snooze statically defined */
if (nr_pnv_idle_states <= 0) {
power_mgt = of_find_node_by_path("/ibm,opal/power-mgt"); pr_warn("cpuidle-powernv : Only Snooze is available\n");
if (!power_mgt) {
pr_warn("opal: PowerMgmt Node not found\n");
goto out;
}
/* Read values of any property to determine the num of idle states */
dt_idle_states = of_property_count_u32_elems(power_mgt, "ibm,cpu-idle-state-flags");
if (dt_idle_states < 0) {
pr_warn("cpuidle-powernv: no idle states found in the DT\n");
goto out; goto out;
} }
count = of_property_count_u32_elems(power_mgt, /* TODO: Count only states which are eligible for cpuidle */
"ibm,cpu-idle-state-latencies-ns"); dt_idle_states = nr_pnv_idle_states;
if (validate_dt_prop_sizes("ibm,cpu-idle-state-flags", dt_idle_states,
"ibm,cpu-idle-state-latencies-ns",
count) != 0)
goto out;
count = of_property_count_strings(power_mgt,
"ibm,cpu-idle-state-names");
if (validate_dt_prop_sizes("ibm,cpu-idle-state-flags", dt_idle_states,
"ibm,cpu-idle-state-names",
count) != 0)
goto out;
/* /*
* Since snooze is used as first idle state, max idle states allowed is * Since snooze is used as first idle state, max idle states allowed is
* CPUIDLE_STATE_MAX -1 * CPUIDLE_STATE_MAX -1
*/ */
if (dt_idle_states > CPUIDLE_STATE_MAX - 1) { if (nr_pnv_idle_states > CPUIDLE_STATE_MAX - 1) {
pr_warn("cpuidle-powernv: discovered idle states more than allowed"); pr_warn("cpuidle-powernv: discovered idle states more than allowed");
dt_idle_states = CPUIDLE_STATE_MAX - 1; dt_idle_states = CPUIDLE_STATE_MAX - 1;
} }
if (of_property_read_u32_array(power_mgt,
"ibm,cpu-idle-state-flags", flags, dt_idle_states)) {
pr_warn("cpuidle-powernv : missing ibm,cpu-idle-state-flags in DT\n");
goto out;
}
if (of_property_read_u32_array(power_mgt,
"ibm,cpu-idle-state-latencies-ns", latency_ns,
dt_idle_states)) {
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 * If the idle states use stop instruction, probe for psscr values
* and psscr mask which are necessary to specify required stop level. * and psscr mask which are necessary to specify required stop level.
*/ */
has_stop_states = (flags[0] & has_stop_states = (pnv_idle_states[0].flags &
(OPAL_PM_STOP_INST_FAST | OPAL_PM_STOP_INST_DEEP)); (OPAL_PM_STOP_INST_FAST | OPAL_PM_STOP_INST_DEEP));
if (has_stop_states) {
count = of_property_count_u64_elems(power_mgt,
"ibm,cpu-idle-state-psscr");
if (validate_dt_prop_sizes("ibm,cpu-idle-state-flags",
dt_idle_states,
"ibm,cpu-idle-state-psscr",
count) != 0)
goto out;
count = of_property_count_u64_elems(power_mgt,
"ibm,cpu-idle-state-psscr-mask");
if (validate_dt_prop_sizes("ibm,cpu-idle-state-flags",
dt_idle_states,
"ibm,cpu-idle-state-psscr-mask",
count) != 0)
goto out;
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-state-psscr in DT\n");
goto out;
}
if (of_property_read_u64_array(power_mgt,
"ibm,cpu-idle-state-psscr-mask",
psscr_mask, dt_idle_states)) {
pr_warn("cpuidle-powernv:Missing ibm,cpu-idle-state-psscr-mask in DT\n");
goto out;
}
}
count = of_property_count_u32_elems(power_mgt,
"ibm,cpu-idle-state-residency-ns");
if (count < 0) {
rc = count;
} else if (validate_dt_prop_sizes("ibm,cpu-idle-state-flags",
dt_idle_states,
"ibm,cpu-idle-state-residency-ns",
count) != 0) {
goto out;
} else {
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++) { for (i = 0; i < dt_idle_states; i++) {
unsigned int exit_latency, target_residency; unsigned int exit_latency, target_residency;
bool stops_timebase = false; bool stops_timebase = false;
struct pnv_idle_states_t *state = &pnv_idle_states[i];
/* /*
* Skip the platform idle state whose flag isn't in * Skip the platform idle state whose flag isn't in
* the supported_cpuidle_states flag mask. * the supported_cpuidle_states flag mask.
*/ */
if ((flags[i] & supported_flags) != flags[i]) if ((state->flags & supported_flags) != state->flags)
continue; continue;
/* /*
* If an idle state has exit latency beyond * If an idle state has exit latency beyond
* POWERNV_THRESHOLD_LATENCY_NS then don't use it * POWERNV_THRESHOLD_LATENCY_NS then don't use it
* in cpu-idle. * in cpu-idle.
*/ */
if (latency_ns[i] > POWERNV_THRESHOLD_LATENCY_NS) if (state->latency_ns > POWERNV_THRESHOLD_LATENCY_NS)
continue; continue;
/* /*
* Firmware passes residency and latency values in ns. * Firmware passes residency and latency values in ns.
* cpuidle expects it in us. * cpuidle expects it in us.
*/ */
exit_latency = DIV_ROUND_UP(latency_ns[i], 1000); exit_latency = DIV_ROUND_UP(state->latency_ns, 1000);
if (!rc) target_residency = DIV_ROUND_UP(state->residency_ns, 1000);
target_residency = DIV_ROUND_UP(residency_ns[i], 1000);
else if (has_stop_states && !(state->valid))
target_residency = 0;
if (has_stop_states) {
int err = validate_psscr_val_mask(&psscr_val[i],
&psscr_mask[i],
flags[i]);
if (err) {
report_invalid_psscr_val(psscr_val[i], err);
continue; continue;
}
}
if (flags[i] & OPAL_PM_TIMEBASE_STOP) if (state->flags & OPAL_PM_TIMEBASE_STOP)
stops_timebase = true; stops_timebase = true;
/* if (state->flags & OPAL_PM_NAP_ENABLED) {
* For nap and fastsleep, use default target_residency
* values if f/w does not expose it.
*/
if (flags[i] & OPAL_PM_NAP_ENABLED) {
if (!rc)
target_residency = 100;
/* Add NAP state */ /* Add NAP state */
add_powernv_state(nr_idle_states, "Nap", add_powernv_state(nr_idle_states, "Nap",
CPUIDLE_FLAG_NONE, nap_loop, CPUIDLE_FLAG_NONE, nap_loop,
target_residency, exit_latency, 0, 0); target_residency, exit_latency, 0, 0);
} else if (has_stop_states && !stops_timebase) { } else if (has_stop_states && !stops_timebase) {
add_powernv_state(nr_idle_states, names[i], add_powernv_state(nr_idle_states, state->name,
CPUIDLE_FLAG_NONE, stop_loop, CPUIDLE_FLAG_NONE, stop_loop,
target_residency, exit_latency, target_residency, exit_latency,
psscr_val[i], psscr_mask[i]); state->psscr_val,
state->psscr_mask);
} }
/* /*
...@@ -450,20 +345,19 @@ static int powernv_add_idle_states(void) ...@@ -450,20 +345,19 @@ static int powernv_add_idle_states(void)
* within this config dependency check. * within this config dependency check.
*/ */
#ifdef CONFIG_TICK_ONESHOT #ifdef CONFIG_TICK_ONESHOT
else if (flags[i] & OPAL_PM_SLEEP_ENABLED || else if (state->flags & OPAL_PM_SLEEP_ENABLED ||
flags[i] & OPAL_PM_SLEEP_ENABLED_ER1) { state->flags & OPAL_PM_SLEEP_ENABLED_ER1) {
if (!rc)
target_residency = 300000;
/* Add FASTSLEEP state */ /* Add FASTSLEEP state */
add_powernv_state(nr_idle_states, "FastSleep", add_powernv_state(nr_idle_states, "FastSleep",
CPUIDLE_FLAG_TIMER_STOP, CPUIDLE_FLAG_TIMER_STOP,
fastsleep_loop, fastsleep_loop,
target_residency, exit_latency, 0, 0); target_residency, exit_latency, 0, 0);
} else if (has_stop_states && stops_timebase) { } else if (has_stop_states && stops_timebase) {
add_powernv_state(nr_idle_states, names[i], add_powernv_state(nr_idle_states, state->name,
CPUIDLE_FLAG_TIMER_STOP, stop_loop, CPUIDLE_FLAG_TIMER_STOP, stop_loop,
target_residency, exit_latency, target_residency, exit_latency,
psscr_val[i], psscr_mask[i]); state->psscr_val,
state->psscr_mask);
} }
#endif #endif
else else
......
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