/* * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #include #include #include #include #include #include #include #include "spmc.h" #include /******************************************************************************* * spmc_build_pm_message * * Builds an SPMC to SP direct message request. ******************************************************************************/ static void spmc_build_pm_message(gp_regs_t *gpregs, unsigned long long message, uint8_t pm_msg_type, uint16_t sp_id) { write_ctx_reg(gpregs, CTX_GPREG_X0, FFA_MSG_SEND_DIRECT_REQ_SMC32); write_ctx_reg(gpregs, CTX_GPREG_X1, (FFA_SPMC_ID << FFA_DIRECT_MSG_SOURCE_SHIFT) | sp_id); write_ctx_reg(gpregs, CTX_GPREG_X2, FFA_FWK_MSG_BIT | (pm_msg_type & FFA_FWK_MSG_MASK)); write_ctx_reg(gpregs, CTX_GPREG_X3, message); } /******************************************************************************* * This CPU has been turned on. Enter the SP to initialise S-EL1. ******************************************************************************/ static void spmc_cpu_on_finish_handler(u_register_t unused) { struct secure_partition_desc *sp = spmc_get_current_sp_ctx(); struct sp_exec_ctx *ec; unsigned int linear_id = plat_my_core_pos(); entry_point_info_t sec_ec_ep_info = {0}; uint64_t rc; /* Sanity check for a NULL pointer dereference. */ assert(sp != NULL); /* Initialize entry point information for the SP. */ SET_PARAM_HEAD(&sec_ec_ep_info, PARAM_EP, VERSION_1, SECURE | EP_ST_ENABLE); /* * Check if the primary execution context registered an entry point else * bail out early. * TODO: Add support for boot reason in manifest to allow jumping to * entrypoint into the primary execution context. */ if (sp->secondary_ep == 0) { WARN("%s: No secondary ep on core%u\n", __func__, linear_id); return; } sec_ec_ep_info.pc = sp->secondary_ep; /* * Setup and initialise the SP execution context on this physical cpu. */ spmc_el1_sp_setup(sp, &sec_ec_ep_info); spmc_sp_common_ep_commit(sp, &sec_ec_ep_info); /* Obtain a reference to the SP execution context. */ ec = spmc_get_sp_ec(sp); /* * TODO: Should we do some PM related state tracking of the SP execution * context here? */ /* Update the runtime model and state of the partition. */ ec->rt_model = RT_MODEL_INIT; ec->rt_state = RT_STATE_RUNNING; INFO("SP (0x%x) init start on core%u.\n", sp->sp_id, linear_id); rc = spmc_sp_synchronous_entry(ec); if (rc != 0ULL) { ERROR("%s failed (%lu) on CPU%u\n", __func__, rc, linear_id); } /* Update the runtime state of the partition. */ ec->rt_state = RT_STATE_WAITING; VERBOSE("CPU %u on!\n", linear_id); } /******************************************************************************* * Helper function to send a FF-A power management message to an SP. ******************************************************************************/ static int32_t spmc_send_pm_msg(uint8_t pm_msg_type, unsigned long long psci_event) { struct secure_partition_desc *sp = spmc_get_current_sp_ctx(); struct sp_exec_ctx *ec; gp_regs_t *gpregs_ctx; unsigned int linear_id = plat_my_core_pos(); u_register_t resp; uint64_t rc; /* Obtain a reference to the SP execution context. */ ec = spmc_get_sp_ec(sp); /* * TODO: Should we do some PM related state tracking of the SP execution * context here? */ /* * Build an SPMC to SP direct message request. * Note that x4-x6 should be populated with the original PSCI arguments. */ spmc_build_pm_message(get_gpregs_ctx(&ec->cpu_ctx), psci_event, pm_msg_type, sp->sp_id); /* Sanity check partition state. */ assert(ec->rt_state == RT_STATE_WAITING); /* Update the runtime model and state of the partition. */ ec->rt_model = RT_MODEL_DIR_REQ; ec->rt_state = RT_STATE_RUNNING; rc = spmc_sp_synchronous_entry(ec); if (rc != 0ULL) { ERROR("%s failed (%lu) on CPU%u.\n", __func__, rc, linear_id); assert(false); return -EINVAL; } /* * Validate we receive an expected response from the SP. * TODO: We don't currently support aborting an SP in the scenario * where it is misbehaving so assert these conditions are not * met for now. */ gpregs_ctx = get_gpregs_ctx(&ec->cpu_ctx); /* Expect a direct message response from the SP. */ resp = read_ctx_reg(gpregs_ctx, CTX_GPREG_X0); if (resp != FFA_MSG_SEND_DIRECT_RESP_SMC32) { ERROR("%s invalid SP response (%lx).\n", __func__, resp); assert(false); return -EINVAL; } /* Ensure the sender and receiver are populated correctly. */ resp = read_ctx_reg(gpregs_ctx, CTX_GPREG_X1); if (!(ffa_endpoint_source(resp) == sp->sp_id && ffa_endpoint_destination(resp) == FFA_SPMC_ID)) { ERROR("%s invalid src/dst response (%lx).\n", __func__, resp); assert(false); return -EINVAL; } /* Expect a PM message response from the SP. */ resp = read_ctx_reg(gpregs_ctx, CTX_GPREG_X2); if ((resp & FFA_FWK_MSG_BIT) == 0U || ((resp & FFA_FWK_MSG_MASK) != FFA_PM_MSG_PM_RESP)) { ERROR("%s invalid PM response (%lx).\n", __func__, resp); assert(false); return -EINVAL; } /* Update the runtime state of the partition. */ ec->rt_state = RT_STATE_WAITING; /* Return the status code returned by the SP */ return read_ctx_reg(gpregs_ctx, CTX_GPREG_X3); } /******************************************************************************* * spmc_cpu_suspend_finish_handler ******************************************************************************/ static void spmc_cpu_suspend_finish_handler(u_register_t unused) { struct secure_partition_desc *sp = spmc_get_current_sp_ctx(); unsigned int linear_id = plat_my_core_pos(); int32_t rc; /* Sanity check for a NULL pointer dereference. */ assert(sp != NULL); /* * Check if the SP has subscribed for this power management message. * If not then we don't have anything else to do here. */ if ((sp->pwr_mgmt_msgs & FFA_PM_MSG_SUB_CPU_SUSPEND_RESUME) == 0U) { goto exit; } rc = spmc_send_pm_msg(FFA_PM_MSG_WB_REQ, FFA_WB_TYPE_NOTS2RAM); if (rc < 0) { ERROR("%s failed (%d) on CPU%u\n", __func__, rc, linear_id); return; } exit: VERBOSE("CPU %u resumed!\n", linear_id); } /******************************************************************************* * spmc_cpu_suspend_handler ******************************************************************************/ static void spmc_cpu_suspend_handler(u_register_t unused) { struct secure_partition_desc *sp = spmc_get_current_sp_ctx(); unsigned int linear_id = plat_my_core_pos(); int32_t rc; /* Sanity check for a NULL pointer dereference. */ assert(sp != NULL); /* * Check if the SP has subscribed for this power management message. * If not then we don't have anything else to do here. */ if ((sp->pwr_mgmt_msgs & FFA_PM_MSG_SUB_CPU_SUSPEND) == 0U) { goto exit; } rc = spmc_send_pm_msg(FFA_FWK_MSG_PSCI, PSCI_CPU_SUSPEND_AARCH64); if (rc < 0) { ERROR("%s failed (%d) on CPU%u\n", __func__, rc, linear_id); return; } exit: VERBOSE("CPU %u suspend!\n", linear_id); } /******************************************************************************* * spmc_cpu_off_handler ******************************************************************************/ static int32_t spmc_cpu_off_handler(u_register_t unused) { struct secure_partition_desc *sp = spmc_get_current_sp_ctx(); unsigned int linear_id = plat_my_core_pos(); int32_t ret = 0; /* Sanity check for a NULL pointer dereference. */ assert(sp != NULL); /* * Check if the SP has subscribed for this power management message. * If not then we don't have anything else to do here. */ if ((sp->pwr_mgmt_msgs & FFA_PM_MSG_SUB_CPU_OFF) == 0U) { goto exit; } ret = spmc_send_pm_msg(FFA_FWK_MSG_PSCI, PSCI_CPU_OFF); if (ret < 0) { ERROR("%s failed (%d) on CPU%u\n", __func__, ret, linear_id); return ret; } exit: VERBOSE("CPU %u off!\n", linear_id); return ret; } /******************************************************************************* * Structure populated by the SPM Core to perform any bookkeeping before * PSCI executes a power mgmt. operation. ******************************************************************************/ const spd_pm_ops_t spmc_pm = { .svc_on_finish = spmc_cpu_on_finish_handler, .svc_off = spmc_cpu_off_handler, .svc_suspend = spmc_cpu_suspend_handler, .svc_suspend_finish = spmc_cpu_suspend_finish_handler };