| /* |
| * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <assert.h> |
| #include <errno.h> |
| |
| #include <lib/el3_runtime/context_mgmt.h> |
| #include <lib/spinlock.h> |
| #include <plat/common/common_def.h> |
| #include <plat/common/platform.h> |
| #include <services/ffa_svc.h> |
| #include "spmc.h" |
| |
| #include <platform_def.h> |
| |
| /******************************************************************************* |
| * 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 |
| }; |