blob: 421db4430bad0769986c7a2444c6584fb4106b0a [file] [log] [blame]
/*
* Copyright (c) 2016-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <debug.h>
#include <platform.h>
#include <platform_def.h>
#include "psci_private.h"
#ifndef PLAT_MAX_PWR_LVL_STATES
#define PLAT_MAX_PWR_LVL_STATES 2U
#endif
/* Following structure is used for PSCI STAT */
typedef struct psci_stat {
u_register_t residency;
u_register_t count;
} psci_stat_t;
/*
* Following is used to keep track of the last cpu
* that goes to power down in non cpu power domains.
*/
static int last_cpu_in_non_cpu_pd[PSCI_NUM_NON_CPU_PWR_DOMAINS] = {
[0 ... PSCI_NUM_NON_CPU_PWR_DOMAINS - 1] = -1};
/*
* Following are used to store PSCI STAT values for
* CPU and non CPU power domains.
*/
static psci_stat_t psci_cpu_stat[PLATFORM_CORE_COUNT]
[PLAT_MAX_PWR_LVL_STATES];
static psci_stat_t psci_non_cpu_stat[PSCI_NUM_NON_CPU_PWR_DOMAINS]
[PLAT_MAX_PWR_LVL_STATES];
/*
* This functions returns the index into the `psci_stat_t` array given the
* local power state and power domain level. If the platform implements the
* `get_pwr_lvl_state_idx` pm hook, then that will be used to return the index.
*/
static int get_stat_idx(plat_local_state_t local_state, unsigned int pwr_lvl)
{
int idx;
if (psci_plat_pm_ops->get_pwr_lvl_state_idx == NULL) {
assert(PLAT_MAX_PWR_LVL_STATES == 2U);
if (is_local_state_retn(local_state) != 0)
return 0;
assert(is_local_state_off(local_state) != 0);
return 1;
}
idx = psci_plat_pm_ops->get_pwr_lvl_state_idx(local_state, pwr_lvl);
assert((idx >= 0) && (idx < (int) PLAT_MAX_PWR_LVL_STATES));
return idx;
}
/*******************************************************************************
* This function is passed the target local power states for each power
* domain (state_info) between the current CPU domain and its ancestors until
* the target power level (end_pwrlvl).
*
* Then, for each level (apart from the CPU level) until the 'end_pwrlvl', it
* updates the `last_cpu_in_non_cpu_pd[]` with last power down cpu id.
*
* This function will only be invoked with data cache enabled and while
* powering down a core.
******************************************************************************/
void psci_stats_update_pwr_down(unsigned int end_pwrlvl,
const psci_power_state_t *state_info)
{
unsigned int lvl, parent_idx;
int cpu_idx = (int) plat_my_core_pos();
assert(end_pwrlvl <= PLAT_MAX_PWR_LVL);
assert(state_info != NULL);
parent_idx = psci_cpu_pd_nodes[cpu_idx].parent_node;
for (lvl = PSCI_CPU_PWR_LVL + 1U; lvl <= end_pwrlvl; lvl++) {
/* Break early if the target power state is RUN */
if (is_local_state_run(state_info->pwr_domain_state[lvl]) != 0)
break;
/*
* The power domain is entering a low power state, so this is
* the last CPU for this power domain
*/
last_cpu_in_non_cpu_pd[parent_idx] = cpu_idx;
parent_idx = psci_non_cpu_pd_nodes[parent_idx].parent_node;
}
}
/*******************************************************************************
* This function updates the PSCI STATS(residency time and count) for CPU
* and NON-CPU power domains.
* It is called with caches enabled and locks acquired(for NON-CPU domain)
******************************************************************************/
void psci_stats_update_pwr_up(unsigned int end_pwrlvl,
const psci_power_state_t *state_info)
{
unsigned int lvl, parent_idx;
int cpu_idx = (int) plat_my_core_pos();
int stat_idx;
plat_local_state_t local_state;
u_register_t residency;
assert(end_pwrlvl <= PLAT_MAX_PWR_LVL);
assert(state_info != NULL);
/* Get the index into the stats array */
local_state = state_info->pwr_domain_state[PSCI_CPU_PWR_LVL];
stat_idx = get_stat_idx(local_state, PSCI_CPU_PWR_LVL);
/* Call into platform interface to calculate residency. */
residency = plat_psci_stat_get_residency(PSCI_CPU_PWR_LVL,
state_info, cpu_idx);
/* Update CPU stats. */
psci_cpu_stat[cpu_idx][stat_idx].residency += residency;
psci_cpu_stat[cpu_idx][stat_idx].count++;
/*
* Check what power domains above CPU were off
* prior to this CPU powering on.
*/
parent_idx = psci_cpu_pd_nodes[cpu_idx].parent_node;
/* Return early if this is the first power up. */
if (last_cpu_in_non_cpu_pd[parent_idx] == -1)
return;
for (lvl = PSCI_CPU_PWR_LVL + 1U; lvl <= end_pwrlvl; lvl++) {
local_state = state_info->pwr_domain_state[lvl];
if (is_local_state_run(local_state) != 0) {
/* Break early */
break;
}
assert(last_cpu_in_non_cpu_pd[parent_idx] != -1);
/* Call into platform interface to calculate residency. */
residency = plat_psci_stat_get_residency(lvl, state_info,
last_cpu_in_non_cpu_pd[parent_idx]);
/* Initialize back to reset value */
last_cpu_in_non_cpu_pd[parent_idx] = -1;
/* Get the index into the stats array */
stat_idx = get_stat_idx(local_state, lvl);
/* Update non cpu stats */
psci_non_cpu_stat[parent_idx][stat_idx].residency += residency;
psci_non_cpu_stat[parent_idx][stat_idx].count++;
parent_idx = psci_non_cpu_pd_nodes[parent_idx].parent_node;
}
}
/*******************************************************************************
* This function returns the appropriate count and residency time of the
* local state for the highest power level expressed in the `power_state`
* for the node represented by `target_cpu`.
******************************************************************************/
static int psci_get_stat(u_register_t target_cpu, unsigned int power_state,
psci_stat_t *psci_stat)
{
int rc;
unsigned int pwrlvl, lvl, parent_idx, target_idx;
int stat_idx;
psci_power_state_t state_info = { {PSCI_LOCAL_STATE_RUN} };
plat_local_state_t local_state;
/* Validate the target_cpu parameter and determine the cpu index */
target_idx = (unsigned int) plat_core_pos_by_mpidr(target_cpu);
if (target_idx == (unsigned int) -1)
return PSCI_E_INVALID_PARAMS;
/* Validate the power_state parameter */
if (psci_plat_pm_ops->translate_power_state_by_mpidr == NULL)
rc = psci_validate_power_state(power_state, &state_info);
else
rc = psci_plat_pm_ops->translate_power_state_by_mpidr(
target_cpu, power_state, &state_info);
if (rc != PSCI_E_SUCCESS)
return PSCI_E_INVALID_PARAMS;
/* Find the highest power level */
pwrlvl = psci_find_target_suspend_lvl(&state_info);
if (pwrlvl == PSCI_INVALID_PWR_LVL) {
ERROR("Invalid target power level for PSCI statistics operation\n");
panic();
}
/* Get the index into the stats array */
local_state = state_info.pwr_domain_state[pwrlvl];
stat_idx = get_stat_idx(local_state, pwrlvl);
if (pwrlvl > PSCI_CPU_PWR_LVL) {
/* Get the power domain index */
parent_idx = psci_cpu_pd_nodes[target_idx].parent_node;
for (lvl = PSCI_CPU_PWR_LVL + 1U; lvl < pwrlvl; lvl++)
parent_idx = psci_non_cpu_pd_nodes[parent_idx].parent_node;
/* Get the non cpu power domain stats */
*psci_stat = psci_non_cpu_stat[parent_idx][stat_idx];
} else {
/* Get the cpu power domain stats */
*psci_stat = psci_cpu_stat[target_idx][stat_idx];
}
return PSCI_E_SUCCESS;
}
/* This is the top level function for PSCI_STAT_RESIDENCY SMC. */
u_register_t psci_stat_residency(u_register_t target_cpu,
unsigned int power_state)
{
psci_stat_t psci_stat;
int rc = psci_get_stat(target_cpu, power_state, &psci_stat);
if (rc == PSCI_E_SUCCESS)
return psci_stat.residency;
else
return 0;
}
/* This is the top level function for PSCI_STAT_COUNT SMC. */
u_register_t psci_stat_count(u_register_t target_cpu,
unsigned int power_state)
{
psci_stat_t psci_stat;
int rc = psci_get_stat(target_cpu, power_state, &psci_stat);
if (rc == PSCI_E_SUCCESS)
return psci_stat.count;
else
return 0;
}