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/*
* Copyright (c) 2016-2020, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <arch.h>
#include <lib/pmf/pmf.h>
#include <lib/psci/psci.h>
#include <lib/utils_def.h>
#include <plat/common/platform.h>
#if ENABLE_PSCI_STAT && ENABLE_PMF
#pragma weak plat_psci_stat_accounting_start
#pragma weak plat_psci_stat_accounting_stop
#pragma weak plat_psci_stat_get_residency
/* Maximum time-stamp value read from architectural counters */
#ifdef __aarch64__
#define MAX_TS UINT64_MAX
#else
#define MAX_TS UINT32_MAX
#endif
/* Following are used as ID's to capture time-stamp */
#define PSCI_STAT_ID_ENTER_LOW_PWR 0
#define PSCI_STAT_ID_EXIT_LOW_PWR 1
#define PSCI_STAT_TOTAL_IDS 2
PMF_DECLARE_CAPTURE_TIMESTAMP(psci_svc)
PMF_DECLARE_GET_TIMESTAMP(psci_svc)
PMF_REGISTER_SERVICE(psci_svc, PMF_PSCI_STAT_SVC_ID, PSCI_STAT_TOTAL_IDS,
PMF_STORE_ENABLE)
/*
* This function calculates the stats residency in microseconds,
* taking in account the wrap around condition.
*/
static u_register_t calc_stat_residency(unsigned long long pwrupts,
unsigned long long pwrdnts)
{
/* The divisor to use to convert raw timestamp into microseconds. */
u_register_t residency_div;
u_register_t res;
/*
* Calculate divisor so that it can be directly used to
* convert time-stamp into microseconds.
*/
residency_div = read_cntfrq_el0() / MHZ_TICKS_PER_SEC;
assert(residency_div > 0U);
if (pwrupts < pwrdnts)
res = MAX_TS - pwrdnts + pwrupts;
else
res = pwrupts - pwrdnts;
return res / residency_div;
}
/*
* Capture timestamp before entering a low power state.
* Cache maintenance may be needed when reading these timestamps.
*/
void plat_psci_stat_accounting_start(
__unused const psci_power_state_t *state_info)
{
assert(state_info != NULL);
PMF_CAPTURE_TIMESTAMP(psci_svc, PSCI_STAT_ID_ENTER_LOW_PWR,
PMF_CACHE_MAINT);
}
/*
* Capture timestamp after exiting a low power state.
* Cache maintenance may be needed when reading these timestamps.
*/
void plat_psci_stat_accounting_stop(
__unused const psci_power_state_t *state_info)
{
assert(state_info != NULL);
PMF_CAPTURE_TIMESTAMP(psci_svc, PSCI_STAT_ID_EXIT_LOW_PWR,
PMF_CACHE_MAINT);
}
/*
* Calculate the residency for the given level and power state
* information.
*/
u_register_t plat_psci_stat_get_residency(unsigned int lvl,
const psci_power_state_t *state_info,
unsigned int last_cpu_idx)
{
plat_local_state_t state;
unsigned long long pwrup_ts = 0, pwrdn_ts = 0;
unsigned int pmf_flags;
assert((lvl >= PSCI_CPU_PWR_LVL) && (lvl <= PLAT_MAX_PWR_LVL));
assert(state_info != NULL);
assert(last_cpu_idx <= PLATFORM_CORE_COUNT);
if (lvl == PSCI_CPU_PWR_LVL)
assert(last_cpu_idx == plat_my_core_pos());
/*
* If power down is requested, then timestamp capture will
* be with caches OFF. Hence we have to do cache maintenance
* when reading the timestamp.
*/
state = state_info->pwr_domain_state[PSCI_CPU_PWR_LVL];
if (is_local_state_off(state) != 0) {
pmf_flags = PMF_CACHE_MAINT;
} else {
assert(is_local_state_retn(state) == 1);
pmf_flags = PMF_NO_CACHE_MAINT;
}
PMF_GET_TIMESTAMP_BY_INDEX(psci_svc,
PSCI_STAT_ID_ENTER_LOW_PWR,
last_cpu_idx,
pmf_flags,
pwrdn_ts);
PMF_GET_TIMESTAMP_BY_INDEX(psci_svc,
PSCI_STAT_ID_EXIT_LOW_PWR,
plat_my_core_pos(),
pmf_flags,
pwrup_ts);
return calc_stat_residency(pwrup_ts, pwrdn_ts);
}
#endif /* ENABLE_PSCI_STAT && ENABLE_PMF */
/*
* The PSCI generic code uses this API to let the platform participate in state
* coordination during a power management operation. It compares the platform
* specific local power states requested by each cpu for a given power domain
* and returns the coordinated target power state that the domain should
* enter. A platform assigns a number to a local power state. This default
* implementation assumes that the platform assigns these numbers in order of
* increasing depth of the power state i.e. for two power states X & Y, if X < Y
* then X represents a shallower power state than Y. As a result, the
* coordinated target local power state for a power domain will be the minimum
* of the requested local power states.
*/
plat_local_state_t plat_get_target_pwr_state(unsigned int lvl,
const plat_local_state_t *states,
unsigned int ncpu)
{
plat_local_state_t target = PLAT_MAX_OFF_STATE, temp;
const plat_local_state_t *st = states;
unsigned int n = ncpu;
assert(ncpu > 0U);
do {
temp = *st;
st++;
if (temp < target)
target = temp;
n--;
} while (n > 0U);
return target;
}
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