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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 | // SPDX-License-Identifier: GPL-2.0-or-later /* * PowerNV OPAL power control for graceful shutdown handling * * Copyright 2015 IBM Corp. */ #define pr_fmt(fmt) "opal-power: " fmt #include <linux/kernel.h> #include <linux/reboot.h> #include <linux/notifier.h> #include <linux/of.h> #include <asm/opal.h> #include <asm/machdep.h> #define SOFT_OFF 0x00 #define SOFT_REBOOT 0x01 /* Detect EPOW event */ static bool detect_epow(void) { u16 epow; int i, rc; __be16 epow_classes; __be16 opal_epow_status[OPAL_SYSEPOW_MAX] = {0}; /* * Check for EPOW event. Kernel sends supported EPOW classes info * to OPAL. OPAL returns EPOW info along with classes present. */ epow_classes = cpu_to_be16(OPAL_SYSEPOW_MAX); rc = opal_get_epow_status(opal_epow_status, &epow_classes); if (rc != OPAL_SUCCESS) { pr_err("Failed to get EPOW event information\n"); return false; } /* Look for EPOW events present */ for (i = 0; i < be16_to_cpu(epow_classes); i++) { epow = be16_to_cpu(opal_epow_status[i]); /* Filter events which do not need shutdown. */ if (i == OPAL_SYSEPOW_POWER) epow &= ~(OPAL_SYSPOWER_CHNG | OPAL_SYSPOWER_FAIL | OPAL_SYSPOWER_INCL); if (epow) return true; } return false; } /* Check for existing EPOW, DPO events */ static bool poweroff_pending(void) { int rc; __be64 opal_dpo_timeout; /* Check for DPO event */ rc = opal_get_dpo_status(&opal_dpo_timeout); if (rc == OPAL_SUCCESS) { pr_info("Existing DPO event detected.\n"); return true; } /* Check for EPOW event */ if (detect_epow()) { pr_info("Existing EPOW event detected.\n"); return true; } return false; } /* OPAL power-control events notifier */ static int opal_power_control_event(struct notifier_block *nb, unsigned long msg_type, void *msg) { uint64_t type; switch (msg_type) { case OPAL_MSG_EPOW: if (detect_epow()) { pr_info("EPOW msg received. Powering off system\n"); orderly_poweroff(true); } break; case OPAL_MSG_DPO: pr_info("DPO msg received. Powering off system\n"); orderly_poweroff(true); break; case OPAL_MSG_SHUTDOWN: type = be64_to_cpu(((struct opal_msg *)msg)->params[0]); switch (type) { case SOFT_REBOOT: pr_info("Reboot requested\n"); orderly_reboot(); break; case SOFT_OFF: pr_info("Poweroff requested\n"); orderly_poweroff(true); break; default: pr_err("Unknown power-control type %llu\n", type); } break; default: pr_err("Unknown OPAL message type %lu\n", msg_type); } return 0; } /* OPAL EPOW event notifier block */ static struct notifier_block opal_epow_nb = { .notifier_call = opal_power_control_event, .next = NULL, .priority = 0, }; /* OPAL DPO event notifier block */ static struct notifier_block opal_dpo_nb = { .notifier_call = opal_power_control_event, .next = NULL, .priority = 0, }; /* OPAL power-control event notifier block */ static struct notifier_block opal_power_control_nb = { .notifier_call = opal_power_control_event, .next = NULL, .priority = 0, }; int __init opal_power_control_init(void) { int ret, supported = 0; struct device_node *np; /* Register OPAL power-control events notifier */ ret = opal_message_notifier_register(OPAL_MSG_SHUTDOWN, &opal_power_control_nb); if (ret) pr_err("Failed to register SHUTDOWN notifier, ret = %d\n", ret); /* Determine OPAL EPOW, DPO support */ np = of_find_node_by_path("/ibm,opal/epow"); if (np) { supported = of_device_is_compatible(np, "ibm,opal-v3-epow"); of_node_put(np); } if (!supported) return 0; pr_info("OPAL EPOW, DPO support detected.\n"); /* Register EPOW event notifier */ ret = opal_message_notifier_register(OPAL_MSG_EPOW, &opal_epow_nb); if (ret) pr_err("Failed to register EPOW notifier, ret = %d\n", ret); /* Register DPO event notifier */ ret = opal_message_notifier_register(OPAL_MSG_DPO, &opal_dpo_nb); if (ret) pr_err("Failed to register DPO notifier, ret = %d\n", ret); /* Check for any pending EPOW or DPO events. */ if (poweroff_pending()) orderly_poweroff(true); return 0; } |