/* * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of ARM nor the names of its contributors may be used * to endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include "psci_private.h" /* * SPD power management operations, expected to be supplied by the registered * SPD on successful SP initialization */ const spd_pm_ops_t *psci_spd_pm; /* * PSCI requested local power state map. This array is used to store the local * power states requested by a CPU for power levels from level 1 to * PLAT_MAX_PWR_LVL. It does not store the requested local power state for power * level 0 (PSCI_CPU_PWR_LVL) as the requested and the target power state for a * CPU are the same. * * During state coordination, the platform is passed an array containing the * local states requested for a particular non cpu power domain by each cpu * within the domain. * * TODO: Dense packing of the requested states will cause cache thrashing * when multiple power domains write to it. If we allocate the requested * states at each power level in a cache-line aligned per-domain memory, * the cache thrashing can be avoided. */ static plat_local_state_t psci_req_local_pwr_states[PLAT_MAX_PWR_LVL][PLATFORM_CORE_COUNT]; /******************************************************************************* * Arrays that hold the platform's power domain tree information for state * management of power domains. * Each node in the array 'psci_non_cpu_pd_nodes' corresponds to a power domain * which is an ancestor of a CPU power domain. * Each node in the array 'psci_cpu_pd_nodes' corresponds to a cpu power domain ******************************************************************************/ non_cpu_pd_node_t psci_non_cpu_pd_nodes[PSCI_NUM_NON_CPU_PWR_DOMAINS] #if USE_COHERENT_MEM __section("tzfw_coherent_mem") #endif ; DEFINE_BAKERY_LOCK(psci_locks[PSCI_NUM_NON_CPU_PWR_DOMAINS]); cpu_pd_node_t psci_cpu_pd_nodes[PLATFORM_CORE_COUNT]; /******************************************************************************* * Pointer to functions exported by the platform to complete power mgmt. ops ******************************************************************************/ const plat_psci_ops_t *psci_plat_pm_ops; /****************************************************************************** * Check that the maximum power level supported by the platform makes sense *****************************************************************************/ CASSERT(PLAT_MAX_PWR_LVL <= PSCI_MAX_PWR_LVL && \ PLAT_MAX_PWR_LVL >= PSCI_CPU_PWR_LVL, \ assert_platform_max_pwrlvl_check); /* * The plat_local_state used by the platform is one of these types: RUN, * RETENTION and OFF. The platform can define further sub-states for each type * apart from RUN. This categorization is done to verify the sanity of the * psci_power_state passed by the platform and to print debug information. The * categorization is done on the basis of the following conditions: * * 1. If (plat_local_state == 0) then the category is STATE_TYPE_RUN. * * 2. If (0 < plat_local_state <= PLAT_MAX_RET_STATE), then the category is * STATE_TYPE_RETN. * * 3. If (plat_local_state > PLAT_MAX_RET_STATE), then the category is * STATE_TYPE_OFF. */ typedef enum plat_local_state_type { STATE_TYPE_RUN = 0, STATE_TYPE_RETN, STATE_TYPE_OFF } plat_local_state_type_t; /* The macro used to categorize plat_local_state. */ #define find_local_state_type(plat_local_state) \ ((plat_local_state) ? ((plat_local_state > PLAT_MAX_RET_STATE) \ ? STATE_TYPE_OFF : STATE_TYPE_RETN) \ : STATE_TYPE_RUN) /****************************************************************************** * Check that the maximum retention level supported by the platform is less * than the maximum off level. *****************************************************************************/ CASSERT(PLAT_MAX_RET_STATE < PLAT_MAX_OFF_STATE, \ assert_platform_max_off_and_retn_state_check); /****************************************************************************** * This function ensures that the power state parameter in a CPU_SUSPEND request * is valid. If so, it returns the requested states for each power level. *****************************************************************************/ int psci_validate_power_state(unsigned int power_state, psci_power_state_t *state_info) { /* Check SBZ bits in power state are zero */ if (psci_check_power_state(power_state)) return PSCI_E_INVALID_PARAMS; assert(psci_plat_pm_ops->validate_power_state); /* Validate the power_state using platform pm_ops */ return psci_plat_pm_ops->validate_power_state(power_state, state_info); } /****************************************************************************** * This function retrieves the `psci_power_state_t` for system suspend from * the platform. *****************************************************************************/ void psci_query_sys_suspend_pwrstate(psci_power_state_t *state_info) { /* * Assert that the required pm_ops hook is implemented to ensure that * the capability detected during psci_setup() is valid. */ assert(psci_plat_pm_ops->get_sys_suspend_power_state); /* * Query the platform for the power_state required for system suspend */ psci_plat_pm_ops->get_sys_suspend_power_state(state_info); } /******************************************************************************* * This function verifies that the all the other cores in the system have been * turned OFF and the current CPU is the last running CPU in the system. * Returns 1 (true) if the current CPU is the last ON CPU or 0 (false) * otherwise. ******************************************************************************/ unsigned int psci_is_last_on_cpu(void) { unsigned int cpu_idx, my_idx = plat_my_core_pos(); for (cpu_idx = 0; cpu_idx < PLATFORM_CORE_COUNT; cpu_idx++) { if (cpu_idx == my_idx) { assert(psci_get_aff_info_state() == AFF_STATE_ON); continue; } if (psci_get_aff_info_state_by_idx(cpu_idx) != AFF_STATE_OFF) return 0; } return 1; } /******************************************************************************* * Routine to return the maximum power level to traverse to after a cpu has * been physically powered up. It is expected to be called immediately after * reset from assembler code. ******************************************************************************/ static unsigned int get_power_on_target_pwrlvl(void) { unsigned int pwrlvl; /* * Assume that this cpu was suspended and retrieve its target power * level. If it is invalid then it could only have been turned off * earlier. PLAT_MAX_PWR_LVL will be the highest power level a * cpu can be turned off to. */ pwrlvl = psci_get_suspend_pwrlvl(); if (pwrlvl == PSCI_INVALID_PWR_LVL) pwrlvl = PLAT_MAX_PWR_LVL; return pwrlvl; } /****************************************************************************** * Helper function to update the requested local power state array. This array * does not store the requested state for the CPU power level. Hence an * assertion is added to prevent us from accessing the wrong index. *****************************************************************************/ static void psci_set_req_local_pwr_state(unsigned int pwrlvl, unsigned int cpu_idx, plat_local_state_t req_pwr_state) { assert(pwrlvl > PSCI_CPU_PWR_LVL); psci_req_local_pwr_states[pwrlvl - 1][cpu_idx] = req_pwr_state; } /****************************************************************************** * This function initializes the psci_req_local_pwr_states. *****************************************************************************/ void psci_init_req_local_pwr_states(void) { /* Initialize the requested state of all non CPU power domains as OFF */ memset(&psci_req_local_pwr_states, PLAT_MAX_OFF_STATE, sizeof(psci_req_local_pwr_states)); } /****************************************************************************** * Helper function to return a reference to an array containing the local power * states requested by each cpu for a power domain at 'pwrlvl'. The size of the * array will be the number of cpu power domains of which this power domain is * an ancestor. These requested states will be used to determine a suitable * target state for this power domain during psci state coordination. An * assertion is added to prevent us from accessing the CPU power level. *****************************************************************************/ static plat_local_state_t *psci_get_req_local_pwr_states(unsigned int pwrlvl, unsigned int cpu_idx) { assert(pwrlvl > PSCI_CPU_PWR_LVL); return &psci_req_local_pwr_states[pwrlvl - 1][cpu_idx]; } /* * psci_non_cpu_pd_nodes can be placed either in normal memory or coherent * memory. * * With !USE_COHERENT_MEM, psci_non_cpu_pd_nodes is placed in normal memory, * it's accessed by both cached and non-cached participants. To serve the common * minimum, perform a cache flush before read and after write so that non-cached * participants operate on latest data in main memory. * * When USE_COHERENT_MEM is used, psci_non_cpu_pd_nodes is placed in coherent * memory. With HW_ASSISTED_COHERENCY, all PSCI participants are cache-coherent. * In both cases, no cache operations are required. */ /* * Retrieve local state of non-CPU power domain node from a non-cached CPU, * after any required cache maintenance operation. */ static plat_local_state_t get_non_cpu_pd_node_local_state( unsigned int parent_idx) { #if !USE_COHERENT_MEM || !HW_ASSISTED_COHERENCY flush_dcache_range( (uintptr_t) &psci_non_cpu_pd_nodes[parent_idx], sizeof(psci_non_cpu_pd_nodes[parent_idx])); #endif return psci_non_cpu_pd_nodes[parent_idx].local_state; } /* * Update local state of non-CPU power domain node from a cached CPU; perform * any required cache maintenance operation afterwards. */ static void set_non_cpu_pd_node_local_state(unsigned int parent_idx, plat_local_state_t state) { psci_non_cpu_pd_nodes[parent_idx].local_state = state; #if !USE_COHERENT_MEM || !HW_ASSISTED_COHERENCY flush_dcache_range( (uintptr_t) &psci_non_cpu_pd_nodes[parent_idx], sizeof(psci_non_cpu_pd_nodes[parent_idx])); #endif } /****************************************************************************** * Helper function to return the current local power state of each power domain * from the current cpu power domain to its ancestor at the 'end_pwrlvl'. This * function will be called after a cpu is powered on to find the local state * each power domain has emerged from. *****************************************************************************/ void psci_get_target_local_pwr_states(unsigned int end_pwrlvl, psci_power_state_t *target_state) { unsigned int parent_idx, lvl; plat_local_state_t *pd_state = target_state->pwr_domain_state; pd_state[PSCI_CPU_PWR_LVL] = psci_get_cpu_local_state(); parent_idx = psci_cpu_pd_nodes[plat_my_core_pos()].parent_node; /* Copy the local power state from node to state_info */ for (lvl = PSCI_CPU_PWR_LVL + 1; lvl <= end_pwrlvl; lvl++) { pd_state[lvl] = get_non_cpu_pd_node_local_state(parent_idx); parent_idx = psci_non_cpu_pd_nodes[parent_idx].parent_node; } /* Set the the higher levels to RUN */ for (; lvl <= PLAT_MAX_PWR_LVL; lvl++) target_state->pwr_domain_state[lvl] = PSCI_LOCAL_STATE_RUN; } /****************************************************************************** * Helper function to set the target local power state that each power domain * from the current cpu power domain to its ancestor at the 'end_pwrlvl' will * enter. This function will be called after coordination of requested power * states has been done for each power level. *****************************************************************************/ static void psci_set_target_local_pwr_states(unsigned int end_pwrlvl, const psci_power_state_t *target_state) { unsigned int parent_idx, lvl; const plat_local_state_t *pd_state = target_state->pwr_domain_state; psci_set_cpu_local_state(pd_state[PSCI_CPU_PWR_LVL]); /* * Need to flush as local_state might be accessed with Data Cache * disabled during power on */ psci_flush_cpu_data(psci_svc_cpu_data.local_state); parent_idx = psci_cpu_pd_nodes[plat_my_core_pos()].parent_node; /* Copy the local_state from state_info */ for (lvl = 1; lvl <= end_pwrlvl; lvl++) { set_non_cpu_pd_node_local_state(parent_idx, pd_state[lvl]); parent_idx = psci_non_cpu_pd_nodes[parent_idx].parent_node; } } /******************************************************************************* * PSCI helper function to get the parent nodes corresponding to a cpu_index. ******************************************************************************/ void psci_get_parent_pwr_domain_nodes(unsigned int cpu_idx, unsigned int end_lvl, unsigned int node_index[]) { unsigned int parent_node = psci_cpu_pd_nodes[cpu_idx].parent_node; int i; for (i = PSCI_CPU_PWR_LVL + 1; i <= end_lvl; i++) { *node_index++ = parent_node; parent_node = psci_non_cpu_pd_nodes[parent_node].parent_node; } } /****************************************************************************** * This function is invoked post CPU power up and initialization. It sets the * affinity info state, target power state and requested power state for the * current CPU and all its ancestor power domains to RUN. *****************************************************************************/ void psci_set_pwr_domains_to_run(unsigned int end_pwrlvl) { unsigned int parent_idx, cpu_idx = plat_my_core_pos(), lvl; parent_idx = psci_cpu_pd_nodes[cpu_idx].parent_node; /* Reset the local_state to RUN for the non cpu power domains. */ for (lvl = PSCI_CPU_PWR_LVL + 1; lvl <= end_pwrlvl; lvl++) { set_non_cpu_pd_node_local_state(parent_idx, PSCI_LOCAL_STATE_RUN); psci_set_req_local_pwr_state(lvl, cpu_idx, PSCI_LOCAL_STATE_RUN); parent_idx = psci_non_cpu_pd_nodes[parent_idx].parent_node; } /* Set the affinity info state to ON */ psci_set_aff_info_state(AFF_STATE_ON); psci_set_cpu_local_state(PSCI_LOCAL_STATE_RUN); psci_flush_cpu_data(psci_svc_cpu_data); } /****************************************************************************** * This function is passed the local power states requested for each power * domain (state_info) between the current CPU domain and its ancestors until * the target power level (end_pwrlvl). It updates the array of requested power * states with this information. * * Then, for each level (apart from the CPU level) until the 'end_pwrlvl', it * retrieves the states requested by all the cpus of which the power domain at * that level is an ancestor. It passes this information to the platform to * coordinate and return the target power state. If the target state for a level * is RUN then subsequent levels are not considered. At the CPU level, state * coordination is not required. Hence, the requested and the target states are * the same. * * The 'state_info' is updated with the target state for each level between the * CPU and the 'end_pwrlvl' and returned to the caller. * * This function will only be invoked with data cache enabled and while * powering down a core. *****************************************************************************/ void psci_do_state_coordination(unsigned int end_pwrlvl, psci_power_state_t *state_info) { unsigned int lvl, parent_idx, cpu_idx = plat_my_core_pos(); unsigned int start_idx, ncpus; plat_local_state_t target_state, *req_states; assert(end_pwrlvl <= PLAT_MAX_PWR_LVL); parent_idx = psci_cpu_pd_nodes[cpu_idx].parent_node; /* For level 0, the requested state will be equivalent to target state */ for (lvl = PSCI_CPU_PWR_LVL + 1; lvl <= end_pwrlvl; lvl++) { /* First update the requested power state */ psci_set_req_local_pwr_state(lvl, cpu_idx, state_info->pwr_domain_state[lvl]); /* Get the requested power states for this power level */ start_idx = psci_non_cpu_pd_nodes[parent_idx].cpu_start_idx; req_states = psci_get_req_local_pwr_states(lvl, start_idx); /* * Let the platform coordinate amongst the requested states at * this power level and return the target local power state. */ ncpus = psci_non_cpu_pd_nodes[parent_idx].ncpus; target_state = plat_get_target_pwr_state(lvl, req_states, ncpus); state_info->pwr_domain_state[lvl] = target_state; /* Break early if the negotiated target power state is RUN */ if (is_local_state_run(state_info->pwr_domain_state[lvl])) break; parent_idx = psci_non_cpu_pd_nodes[parent_idx].parent_node; } /* * This is for cases when we break out of the above loop early because * the target power state is RUN at a power level < end_pwlvl. * We update the requested power state from state_info and then * set the target state as RUN. */ for (lvl = lvl + 1; lvl <= end_pwrlvl; lvl++) { psci_set_req_local_pwr_state(lvl, cpu_idx, state_info->pwr_domain_state[lvl]); state_info->pwr_domain_state[lvl] = PSCI_LOCAL_STATE_RUN; } /* Update the target state in the power domain nodes */ psci_set_target_local_pwr_states(end_pwrlvl, state_info); } /****************************************************************************** * This function validates a suspend request by making sure that if a standby * state is requested then no power level is turned off and the highest power * level is placed in a standby/retention state. * * It also ensures that the state level X will enter is not shallower than the * state level X + 1 will enter. * * This validation will be enabled only for DEBUG builds as the platform is * expected to perform these validations as well. *****************************************************************************/ int psci_validate_suspend_req(const psci_power_state_t *state_info, unsigned int is_power_down_state) { unsigned int max_off_lvl, target_lvl, max_retn_lvl; plat_local_state_t state; plat_local_state_type_t req_state_type, deepest_state_type; int i; /* Find the target suspend power level */ target_lvl = psci_find_target_suspend_lvl(state_info); if (target_lvl == PSCI_INVALID_PWR_LVL) return PSCI_E_INVALID_PARAMS; /* All power domain levels are in a RUN state to begin with */ deepest_state_type = STATE_TYPE_RUN; for (i = target_lvl; i >= PSCI_CPU_PWR_LVL; i--) { state = state_info->pwr_domain_state[i]; req_state_type = find_local_state_type(state); /* * While traversing from the highest power level to the lowest, * the state requested for lower levels has to be the same or * deeper i.e. equal to or greater than the state at the higher * levels. If this condition is true, then the requested state * becomes the deepest state encountered so far. */ if (req_state_type < deepest_state_type) return PSCI_E_INVALID_PARAMS; deepest_state_type = req_state_type; } /* Find the highest off power level */ max_off_lvl = psci_find_max_off_lvl(state_info); /* The target_lvl is either equal to the max_off_lvl or max_retn_lvl */ max_retn_lvl = PSCI_INVALID_PWR_LVL; if (target_lvl != max_off_lvl) max_retn_lvl = target_lvl; /* * If this is not a request for a power down state then max off level * has to be invalid and max retention level has to be a valid power * level. */ if (!is_power_down_state && (max_off_lvl != PSCI_INVALID_PWR_LVL || max_retn_lvl == PSCI_INVALID_PWR_LVL)) return PSCI_E_INVALID_PARAMS; return PSCI_E_SUCCESS; } /****************************************************************************** * This function finds the highest power level which will be powered down * amongst all the power levels specified in the 'state_info' structure *****************************************************************************/ unsigned int psci_find_max_off_lvl(const psci_power_state_t *state_info) { int i; for (i = PLAT_MAX_PWR_LVL; i >= PSCI_CPU_PWR_LVL; i--) { if (is_local_state_off(state_info->pwr_domain_state[i])) return i; } return PSCI_INVALID_PWR_LVL; } /****************************************************************************** * This functions finds the level of the highest power domain which will be * placed in a low power state during a suspend operation. *****************************************************************************/ unsigned int psci_find_target_suspend_lvl(const psci_power_state_t *state_info) { int i; for (i = PLAT_MAX_PWR_LVL; i >= PSCI_CPU_PWR_LVL; i--) { if (!is_local_state_run(state_info->pwr_domain_state[i])) return i; } return PSCI_INVALID_PWR_LVL; } /******************************************************************************* * This function is passed a cpu_index and the highest level in the topology * tree that the operation should be applied to. It picks up locks in order of * increasing power domain level in the range specified. ******************************************************************************/ void psci_acquire_pwr_domain_locks(unsigned int end_pwrlvl, unsigned int cpu_idx) { unsigned int parent_idx = psci_cpu_pd_nodes[cpu_idx].parent_node; unsigned int level; /* No locking required for level 0. Hence start locking from level 1 */ for (level = PSCI_CPU_PWR_LVL + 1; level <= end_pwrlvl; level++) { psci_lock_get(&psci_non_cpu_pd_nodes[parent_idx]); parent_idx = psci_non_cpu_pd_nodes[parent_idx].parent_node; } } /******************************************************************************* * This function is passed a cpu_index and the highest level in the topology * tree that the operation should be applied to. It releases the locks in order * of decreasing power domain level in the range specified. ******************************************************************************/ void psci_release_pwr_domain_locks(unsigned int end_pwrlvl, unsigned int cpu_idx) { unsigned int parent_idx, parent_nodes[PLAT_MAX_PWR_LVL] = {0}; int level; /* Get the parent nodes */ psci_get_parent_pwr_domain_nodes(cpu_idx, end_pwrlvl, parent_nodes); /* Unlock top down. No unlocking required for level 0. */ for (level = end_pwrlvl; level >= PSCI_CPU_PWR_LVL + 1; level--) { parent_idx = parent_nodes[level - 1]; psci_lock_release(&psci_non_cpu_pd_nodes[parent_idx]); } } /******************************************************************************* * Simple routine to determine whether a mpidr is valid or not. ******************************************************************************/ int psci_validate_mpidr(u_register_t mpidr) { if (plat_core_pos_by_mpidr(mpidr) < 0) return PSCI_E_INVALID_PARAMS; return PSCI_E_SUCCESS; } /******************************************************************************* * This function determines the full entrypoint information for the requested * PSCI entrypoint on power on/resume and returns it. ******************************************************************************/ #ifdef AARCH32 static int psci_get_ns_ep_info(entry_point_info_t *ep, uintptr_t entrypoint, u_register_t context_id) { u_register_t ep_attr; unsigned int aif, ee, mode; u_register_t scr = read_scr(); u_register_t ns_sctlr, sctlr; /* Switch to non secure state */ write_scr(scr | SCR_NS_BIT); isb(); ns_sctlr = read_sctlr(); sctlr = scr & SCR_HCE_BIT ? read_hsctlr() : ns_sctlr; /* Return to original state */ write_scr(scr); isb(); ee = 0; ep_attr = NON_SECURE | EP_ST_DISABLE; if (sctlr & SCTLR_EE_BIT) { ep_attr |= EP_EE_BIG; ee = 1; } SET_PARAM_HEAD(ep, PARAM_EP, VERSION_1, ep_attr); ep->pc = entrypoint; zeromem(&ep->args, sizeof(ep->args)); ep->args.arg0 = context_id; mode = scr & SCR_HCE_BIT ? MODE32_hyp : MODE32_svc; /* * TODO: Choose async. exception bits if HYP mode is not * implemented according to the values of SCR.{AW, FW} bits */ aif = SPSR_ABT_BIT | SPSR_IRQ_BIT | SPSR_FIQ_BIT; ep->spsr = SPSR_MODE32(mode, entrypoint & 0x1, ee, aif); return PSCI_E_SUCCESS; } #else static int psci_get_ns_ep_info(entry_point_info_t *ep, uintptr_t entrypoint, u_register_t context_id) { u_register_t ep_attr, sctlr; unsigned int daif, ee, mode; u_register_t ns_scr_el3 = read_scr_el3(); u_register_t ns_sctlr_el1 = read_sctlr_el1(); sctlr = ns_scr_el3 & SCR_HCE_BIT ? read_sctlr_el2() : ns_sctlr_el1; ee = 0; ep_attr = NON_SECURE | EP_ST_DISABLE; if (sctlr & SCTLR_EE_BIT) { ep_attr |= EP_EE_BIG; ee = 1; } SET_PARAM_HEAD(ep, PARAM_EP, VERSION_1, ep_attr); ep->pc = entrypoint; zeromem(&ep->args, sizeof(ep->args)); ep->args.arg0 = context_id; /* * Figure out whether the cpu enters the non-secure address space * in aarch32 or aarch64 */ if (ns_scr_el3 & SCR_RW_BIT) { /* * Check whether a Thumb entry point has been provided for an * aarch64 EL */ if (entrypoint & 0x1) return PSCI_E_INVALID_ADDRESS; mode = ns_scr_el3 & SCR_HCE_BIT ? MODE_EL2 : MODE_EL1; ep->spsr = SPSR_64(mode, MODE_SP_ELX, DISABLE_ALL_EXCEPTIONS); } else { mode = ns_scr_el3 & SCR_HCE_BIT ? MODE32_hyp : MODE32_svc; /* * TODO: Choose async. exception bits if HYP mode is not * implemented according to the values of SCR.{AW, FW} bits */ daif = DAIF_ABT_BIT | DAIF_IRQ_BIT | DAIF_FIQ_BIT; ep->spsr = SPSR_MODE32(mode, entrypoint & 0x1, ee, daif); } return PSCI_E_SUCCESS; } #endif /******************************************************************************* * This function validates the entrypoint with the platform layer if the * appropriate pm_ops hook is exported by the platform and returns the * 'entry_point_info'. ******************************************************************************/ int psci_validate_entry_point(entry_point_info_t *ep, uintptr_t entrypoint, u_register_t context_id) { int rc; /* Validate the entrypoint using platform psci_ops */ if (psci_plat_pm_ops->validate_ns_entrypoint) { rc = psci_plat_pm_ops->validate_ns_entrypoint(entrypoint); if (rc != PSCI_E_SUCCESS) return PSCI_E_INVALID_ADDRESS; } /* * Verify and derive the re-entry information for * the non-secure world from the non-secure state from * where this call originated. */ rc = psci_get_ns_ep_info(ep, entrypoint, context_id); return rc; } /******************************************************************************* * Generic handler which is called when a cpu is physically powered on. It * traverses the node information and finds the highest power level powered * off and performs generic, architectural, platform setup and state management * to power on that power level and power levels below it. * e.g. For a cpu that's been powered on, it will call the platform specific * code to enable the gic cpu interface and for a cluster it will enable * coherency at the interconnect level in addition to gic cpu interface. ******************************************************************************/ void psci_warmboot_entrypoint(void) { unsigned int end_pwrlvl, cpu_idx = plat_my_core_pos(); psci_power_state_t state_info = { {PSCI_LOCAL_STATE_RUN} }; /* * Verify that we have been explicitly turned ON or resumed from * suspend. */ if (psci_get_aff_info_state() == AFF_STATE_OFF) { ERROR("Unexpected affinity info state"); panic(); } /* * Get the maximum power domain level to traverse to after this cpu * has been physically powered up. */ end_pwrlvl = get_power_on_target_pwrlvl(); /* * This function acquires the lock corresponding to each power level so * that by the time all locks are taken, the system topology is snapshot * and state management can be done safely. */ psci_acquire_pwr_domain_locks(end_pwrlvl, cpu_idx); #if ENABLE_PSCI_STAT plat_psci_stat_accounting_stop(&state_info); #endif psci_get_target_local_pwr_states(end_pwrlvl, &state_info); /* * This CPU could be resuming from suspend or it could have just been * turned on. To distinguish between these 2 cases, we examine the * affinity state of the CPU: * - If the affinity state is ON_PENDING then it has just been * turned on. * - Else it is resuming from suspend. * * Depending on the type of warm reset identified, choose the right set * of power management handler and perform the generic, architecture * and platform specific handling. */ if (psci_get_aff_info_state() == AFF_STATE_ON_PENDING) psci_cpu_on_finish(cpu_idx, &state_info); else psci_cpu_suspend_finish(cpu_idx, &state_info); /* * Set the requested and target state of this CPU and all the higher * power domains which are ancestors of this CPU to run. */ psci_set_pwr_domains_to_run(end_pwrlvl); #if ENABLE_PSCI_STAT /* * Update PSCI stats. * Caches are off when writing stats data on the power down path. * Since caches are now enabled, it's necessary to do cache * maintenance before reading that same data. */ psci_stats_update_pwr_up(end_pwrlvl, &state_info); #endif /* * This loop releases the lock corresponding to each power level * in the reverse order to which they were acquired. */ psci_release_pwr_domain_locks(end_pwrlvl, cpu_idx); } /******************************************************************************* * This function initializes the set of hooks that PSCI invokes as part of power * management operation. The power management hooks are expected to be provided * by the SPD, after it finishes all its initialization ******************************************************************************/ void psci_register_spd_pm_hook(const spd_pm_ops_t *pm) { assert(pm); psci_spd_pm = pm; if (pm->svc_migrate) psci_caps |= define_psci_cap(PSCI_MIG_AARCH64); if (pm->svc_migrate_info) psci_caps |= define_psci_cap(PSCI_MIG_INFO_UP_CPU_AARCH64) | define_psci_cap(PSCI_MIG_INFO_TYPE); } /******************************************************************************* * This function invokes the migrate info hook in the spd_pm_ops. It performs * the necessary return value validation. If the Secure Payload is UP and * migrate capable, it returns the mpidr of the CPU on which the Secure payload * is resident through the mpidr parameter. Else the value of the parameter on * return is undefined. ******************************************************************************/ int psci_spd_migrate_info(u_register_t *mpidr) { int rc; if (!psci_spd_pm || !psci_spd_pm->svc_migrate_info) return PSCI_E_NOT_SUPPORTED; rc = psci_spd_pm->svc_migrate_info(mpidr); assert(rc == PSCI_TOS_UP_MIG_CAP || rc == PSCI_TOS_NOT_UP_MIG_CAP \ || rc == PSCI_TOS_NOT_PRESENT_MP || rc == PSCI_E_NOT_SUPPORTED); return rc; } /******************************************************************************* * This function prints the state of all power domains present in the * system ******************************************************************************/ void psci_print_power_domain_map(void) { #if LOG_LEVEL >= LOG_LEVEL_INFO unsigned int idx; plat_local_state_t state; plat_local_state_type_t state_type; /* This array maps to the PSCI_STATE_X definitions in psci.h */ static const char * const psci_state_type_str[] = { "ON", "RETENTION", "OFF", }; INFO("PSCI Power Domain Map:\n"); for (idx = 0; idx < (PSCI_NUM_PWR_DOMAINS - PLATFORM_CORE_COUNT); idx++) { state_type = find_local_state_type( psci_non_cpu_pd_nodes[idx].local_state); INFO(" Domain Node : Level %u, parent_node %d," " State %s (0x%x)\n", psci_non_cpu_pd_nodes[idx].level, psci_non_cpu_pd_nodes[idx].parent_node, psci_state_type_str[state_type], psci_non_cpu_pd_nodes[idx].local_state); } for (idx = 0; idx < PLATFORM_CORE_COUNT; idx++) { state = psci_get_cpu_local_state_by_idx(idx); state_type = find_local_state_type(state); INFO(" CPU Node : MPID 0x%llx, parent_node %d," " State %s (0x%x)\n", (unsigned long long)psci_cpu_pd_nodes[idx].mpidr, psci_cpu_pd_nodes[idx].parent_node, psci_state_type_str[state_type], psci_get_cpu_local_state_by_idx(idx)); } #endif } #if ENABLE_PLAT_COMPAT /******************************************************************************* * PSCI Compatibility helper function to return the 'power_state' parameter of * the PSCI CPU SUSPEND request for the current CPU. Returns PSCI_INVALID_DATA * if not invoked within CPU_SUSPEND for the current CPU. ******************************************************************************/ int psci_get_suspend_powerstate(void) { /* Sanity check to verify that CPU is within CPU_SUSPEND */ if (psci_get_aff_info_state() == AFF_STATE_ON && !is_local_state_run(psci_get_cpu_local_state())) return psci_power_state_compat[plat_my_core_pos()]; return PSCI_INVALID_DATA; } /******************************************************************************* * PSCI Compatibility helper function to return the state id of the current * cpu encoded in the 'power_state' parameter. Returns PSCI_INVALID_DATA * if not invoked within CPU_SUSPEND for the current CPU. ******************************************************************************/ int psci_get_suspend_stateid(void) { unsigned int power_state; power_state = psci_get_suspend_powerstate(); if (power_state != PSCI_INVALID_DATA) return psci_get_pstate_id(power_state); return PSCI_INVALID_DATA; } /******************************************************************************* * PSCI Compatibility helper function to return the state id encoded in the * 'power_state' parameter of the CPU specified by 'mpidr'. Returns * PSCI_INVALID_DATA if the CPU is not in CPU_SUSPEND. ******************************************************************************/ int psci_get_suspend_stateid_by_mpidr(unsigned long mpidr) { int cpu_idx = plat_core_pos_by_mpidr(mpidr); if (cpu_idx == -1) return PSCI_INVALID_DATA; /* Sanity check to verify that the CPU is in CPU_SUSPEND */ if (psci_get_aff_info_state_by_idx(cpu_idx) == AFF_STATE_ON && !is_local_state_run(psci_get_cpu_local_state_by_idx(cpu_idx))) return psci_get_pstate_id(psci_power_state_compat[cpu_idx]); return PSCI_INVALID_DATA; } /******************************************************************************* * This function returns highest affinity level which is in OFF * state. The affinity instance with which the level is associated is * determined by the caller. ******************************************************************************/ unsigned int psci_get_max_phys_off_afflvl(void) { psci_power_state_t state_info; zeromem(&state_info, sizeof(state_info)); psci_get_target_local_pwr_states(PLAT_MAX_PWR_LVL, &state_info); return psci_find_target_suspend_lvl(&state_info); } /******************************************************************************* * PSCI Compatibility helper function to return target affinity level requested * for the CPU_SUSPEND. This function assumes affinity levels correspond to * power domain levels on the platform. ******************************************************************************/ int psci_get_suspend_afflvl(void) { return psci_get_suspend_pwrlvl(); } #endif