1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __CPUHOTPLUG_H 3 #define __CPUHOTPLUG_H 4 5 #include <linux/types.h> 6 7 /* 8 * CPU-up CPU-down 9 * 10 * BP AP BP AP 11 * 12 * OFFLINE OFFLINE 13 * | ^ 14 * v | 15 * BRINGUP_CPU->AP_OFFLINE BRINGUP_CPU <- AP_IDLE_DEAD (idle thread/play_dead) 16 * | AP_OFFLINE 17 * v (IRQ-off) ,---------------^ 18 * AP_ONLNE | (stop_machine) 19 * | TEARDOWN_CPU <- AP_ONLINE_IDLE 20 * | ^ 21 * v | 22 * AP_ACTIVE AP_ACTIVE 23 */ 24 25 enum cpuhp_state { 26 CPUHP_INVALID = -1, 27 CPUHP_OFFLINE = 0, 28 CPUHP_CREATE_THREADS, 29 CPUHP_PERF_PREPARE, 30 CPUHP_PERF_X86_PREPARE, 31 CPUHP_PERF_X86_AMD_UNCORE_PREP, 32 CPUHP_PERF_BFIN, 33 CPUHP_PERF_POWER, 34 CPUHP_PERF_SUPERH, 35 CPUHP_X86_HPET_DEAD, 36 CPUHP_X86_APB_DEAD, 37 CPUHP_X86_MCE_DEAD, 38 CPUHP_VIRT_NET_DEAD, 39 CPUHP_SLUB_DEAD, 40 CPUHP_MM_WRITEBACK_DEAD, 41 CPUHP_MM_VMSTAT_DEAD, 42 CPUHP_SOFTIRQ_DEAD, 43 CPUHP_NET_MVNETA_DEAD, 44 CPUHP_CPUIDLE_DEAD, 45 CPUHP_ARM64_FPSIMD_DEAD, 46 CPUHP_ARM_OMAP_WAKE_DEAD, 47 CPUHP_IRQ_POLL_DEAD, 48 CPUHP_BLOCK_SOFTIRQ_DEAD, 49 CPUHP_ACPI_CPUDRV_DEAD, 50 CPUHP_S390_PFAULT_DEAD, 51 CPUHP_BLK_MQ_DEAD, 52 CPUHP_FS_BUFF_DEAD, 53 CPUHP_PRINTK_DEAD, 54 CPUHP_MM_MEMCQ_DEAD, 55 CPUHP_PERCPU_CNT_DEAD, 56 CPUHP_RADIX_DEAD, 57 CPUHP_PAGE_ALLOC_DEAD, 58 CPUHP_NET_DEV_DEAD, 59 CPUHP_PCI_XGENE_DEAD, 60 CPUHP_IOMMU_INTEL_DEAD, 61 CPUHP_LUSTRE_CFS_DEAD, 62 CPUHP_WORKQUEUE_PREP, 63 CPUHP_POWER_NUMA_PREPARE, 64 CPUHP_HRTIMERS_PREPARE, 65 CPUHP_PROFILE_PREPARE, 66 CPUHP_X2APIC_PREPARE, 67 CPUHP_SMPCFD_PREPARE, 68 CPUHP_RELAY_PREPARE, 69 CPUHP_SLAB_PREPARE, 70 CPUHP_MD_RAID5_PREPARE, 71 CPUHP_RCUTREE_PREP, 72 CPUHP_CPUIDLE_COUPLED_PREPARE, 73 CPUHP_POWERPC_PMAC_PREPARE, 74 CPUHP_POWERPC_MMU_CTX_PREPARE, 75 CPUHP_XEN_PREPARE, 76 CPUHP_XEN_EVTCHN_PREPARE, 77 CPUHP_ARM_SHMOBILE_SCU_PREPARE, 78 CPUHP_SH_SH3X_PREPARE, 79 CPUHP_NET_FLOW_PREPARE, 80 CPUHP_TOPOLOGY_PREPARE, 81 CPUHP_NET_IUCV_PREPARE, 82 CPUHP_ARM_BL_PREPARE, 83 CPUHP_TRACE_RB_PREPARE, 84 CPUHP_MM_ZS_PREPARE, 85 CPUHP_MM_ZSWP_MEM_PREPARE, 86 CPUHP_MM_ZSWP_POOL_PREPARE, 87 CPUHP_KVM_PPC_BOOK3S_PREPARE, 88 CPUHP_ZCOMP_PREPARE, 89 CPUHP_TIMERS_DEAD, 90 CPUHP_MIPS_SOC_PREPARE, 91 CPUHP_BP_PREPARE_DYN, 92 CPUHP_BP_PREPARE_DYN_END = CPUHP_BP_PREPARE_DYN + 20, 93 CPUHP_BRINGUP_CPU, 94 CPUHP_AP_IDLE_DEAD, 95 CPUHP_AP_OFFLINE, 96 CPUHP_AP_SCHED_STARTING, 97 CPUHP_AP_RCUTREE_DYING, 98 CPUHP_AP_IRQ_GIC_STARTING, 99 CPUHP_AP_IRQ_HIP04_STARTING, 100 CPUHP_AP_IRQ_ARMADA_XP_STARTING, 101 CPUHP_AP_IRQ_BCM2836_STARTING, 102 CPUHP_AP_ARM_MVEBU_COHERENCY, 103 CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING, 104 CPUHP_AP_PERF_X86_STARTING, 105 CPUHP_AP_PERF_X86_AMD_IBS_STARTING, 106 CPUHP_AP_PERF_X86_CQM_STARTING, 107 CPUHP_AP_PERF_X86_CSTATE_STARTING, 108 CPUHP_AP_PERF_XTENSA_STARTING, 109 CPUHP_AP_PERF_METAG_STARTING, 110 CPUHP_AP_MIPS_OP_LOONGSON3_STARTING, 111 CPUHP_AP_ARM_VFP_STARTING, 112 CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING, 113 CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING, 114 CPUHP_AP_PERF_ARM_ACPI_STARTING, 115 CPUHP_AP_PERF_ARM_STARTING, 116 CPUHP_AP_ARM_L2X0_STARTING, 117 CPUHP_AP_ARM_ARCH_TIMER_STARTING, 118 CPUHP_AP_ARM_GLOBAL_TIMER_STARTING, 119 CPUHP_AP_JCORE_TIMER_STARTING, 120 CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING, 121 CPUHP_AP_ARM_TWD_STARTING, 122 CPUHP_AP_METAG_TIMER_STARTING, 123 CPUHP_AP_QCOM_TIMER_STARTING, 124 CPUHP_AP_ARMADA_TIMER_STARTING, 125 CPUHP_AP_MARCO_TIMER_STARTING, 126 CPUHP_AP_MIPS_GIC_TIMER_STARTING, 127 CPUHP_AP_ARC_TIMER_STARTING, 128 CPUHP_AP_KVM_STARTING, 129 CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING, 130 CPUHP_AP_KVM_ARM_VGIC_STARTING, 131 CPUHP_AP_KVM_ARM_TIMER_STARTING, 132 /* Must be the last timer callback */ 133 CPUHP_AP_DUMMY_TIMER_STARTING, 134 CPUHP_AP_ARM_XEN_STARTING, 135 CPUHP_AP_ARM_CORESIGHT_STARTING, 136 CPUHP_AP_ARM64_ISNDEP_STARTING, 137 CPUHP_AP_SMPCFD_DYING, 138 CPUHP_AP_X86_TBOOT_DYING, 139 CPUHP_AP_ONLINE, 140 CPUHP_TEARDOWN_CPU, 141 CPUHP_AP_ONLINE_IDLE, 142 CPUHP_AP_SMPBOOT_THREADS, 143 CPUHP_AP_X86_VDSO_VMA_ONLINE, 144 CPUHP_AP_IRQ_AFFINITY_ONLINE, 145 CPUHP_AP_PERF_ONLINE, 146 CPUHP_AP_PERF_X86_ONLINE, 147 CPUHP_AP_PERF_X86_UNCORE_ONLINE, 148 CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE, 149 CPUHP_AP_PERF_X86_AMD_POWER_ONLINE, 150 CPUHP_AP_PERF_X86_RAPL_ONLINE, 151 CPUHP_AP_PERF_X86_CQM_ONLINE, 152 CPUHP_AP_PERF_X86_CSTATE_ONLINE, 153 CPUHP_AP_PERF_S390_CF_ONLINE, 154 CPUHP_AP_PERF_S390_SF_ONLINE, 155 CPUHP_AP_PERF_ARM_CCI_ONLINE, 156 CPUHP_AP_PERF_ARM_CCN_ONLINE, 157 CPUHP_AP_PERF_ARM_L2X0_ONLINE, 158 CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE, 159 CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE, 160 CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE, 161 CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE, 162 CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE, 163 CPUHP_AP_WORKQUEUE_ONLINE, 164 CPUHP_AP_RCUTREE_ONLINE, 165 CPUHP_AP_ONLINE_DYN, 166 CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30, 167 CPUHP_AP_X86_HPET_ONLINE, 168 CPUHP_AP_X86_KVM_CLK_ONLINE, 169 CPUHP_AP_ACTIVE, 170 CPUHP_ONLINE, 171 }; 172 173 int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke, 174 int (*startup)(unsigned int cpu), 175 int (*teardown)(unsigned int cpu), bool multi_instance); 176 177 int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name, 178 bool invoke, 179 int (*startup)(unsigned int cpu), 180 int (*teardown)(unsigned int cpu), 181 bool multi_instance); 182 /** 183 * cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks 184 * @state: The state for which the calls are installed 185 * @name: Name of the callback (will be used in debug output) 186 * @startup: startup callback function 187 * @teardown: teardown callback function 188 * 189 * Installs the callback functions and invokes the startup callback on 190 * the present cpus which have already reached the @state. 191 */ 192 static inline int cpuhp_setup_state(enum cpuhp_state state, 193 const char *name, 194 int (*startup)(unsigned int cpu), 195 int (*teardown)(unsigned int cpu)) 196 { 197 return __cpuhp_setup_state(state, name, true, startup, teardown, false); 198 } 199 200 static inline int cpuhp_setup_state_cpuslocked(enum cpuhp_state state, 201 const char *name, 202 int (*startup)(unsigned int cpu), 203 int (*teardown)(unsigned int cpu)) 204 { 205 return __cpuhp_setup_state_cpuslocked(state, name, true, startup, 206 teardown, false); 207 } 208 209 /** 210 * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the 211 * callbacks 212 * @state: The state for which the calls are installed 213 * @name: Name of the callback. 214 * @startup: startup callback function 215 * @teardown: teardown callback function 216 * 217 * Same as @cpuhp_setup_state except that no calls are executed are invoked 218 * during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n. 219 */ 220 static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state, 221 const char *name, 222 int (*startup)(unsigned int cpu), 223 int (*teardown)(unsigned int cpu)) 224 { 225 return __cpuhp_setup_state(state, name, false, startup, teardown, 226 false); 227 } 228 229 static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state, 230 const char *name, 231 int (*startup)(unsigned int cpu), 232 int (*teardown)(unsigned int cpu)) 233 { 234 return __cpuhp_setup_state_cpuslocked(state, name, false, startup, 235 teardown, false); 236 } 237 238 /** 239 * cpuhp_setup_state_multi - Add callbacks for multi state 240 * @state: The state for which the calls are installed 241 * @name: Name of the callback. 242 * @startup: startup callback function 243 * @teardown: teardown callback function 244 * 245 * Sets the internal multi_instance flag and prepares a state to work as a multi 246 * instance callback. No callbacks are invoked at this point. The callbacks are 247 * invoked once an instance for this state are registered via 248 * @cpuhp_state_add_instance or @cpuhp_state_add_instance_nocalls. 249 */ 250 static inline int cpuhp_setup_state_multi(enum cpuhp_state state, 251 const char *name, 252 int (*startup)(unsigned int cpu, 253 struct hlist_node *node), 254 int (*teardown)(unsigned int cpu, 255 struct hlist_node *node)) 256 { 257 return __cpuhp_setup_state(state, name, false, 258 (void *) startup, 259 (void *) teardown, true); 260 } 261 262 int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node, 263 bool invoke); 264 int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state, 265 struct hlist_node *node, bool invoke); 266 267 /** 268 * cpuhp_state_add_instance - Add an instance for a state and invoke startup 269 * callback. 270 * @state: The state for which the instance is installed 271 * @node: The node for this individual state. 272 * 273 * Installs the instance for the @state and invokes the startup callback on 274 * the present cpus which have already reached the @state. The @state must have 275 * been earlier marked as multi-instance by @cpuhp_setup_state_multi. 276 */ 277 static inline int cpuhp_state_add_instance(enum cpuhp_state state, 278 struct hlist_node *node) 279 { 280 return __cpuhp_state_add_instance(state, node, true); 281 } 282 283 /** 284 * cpuhp_state_add_instance_nocalls - Add an instance for a state without 285 * invoking the startup callback. 286 * @state: The state for which the instance is installed 287 * @node: The node for this individual state. 288 * 289 * Installs the instance for the @state The @state must have been earlier 290 * marked as multi-instance by @cpuhp_setup_state_multi. 291 */ 292 static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state, 293 struct hlist_node *node) 294 { 295 return __cpuhp_state_add_instance(state, node, false); 296 } 297 298 static inline int 299 cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state, 300 struct hlist_node *node) 301 { 302 return __cpuhp_state_add_instance_cpuslocked(state, node, false); 303 } 304 305 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke); 306 void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke); 307 308 /** 309 * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown 310 * @state: The state for which the calls are removed 311 * 312 * Removes the callback functions and invokes the teardown callback on 313 * the present cpus which have already reached the @state. 314 */ 315 static inline void cpuhp_remove_state(enum cpuhp_state state) 316 { 317 __cpuhp_remove_state(state, true); 318 } 319 320 /** 321 * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking 322 * teardown 323 * @state: The state for which the calls are removed 324 */ 325 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state) 326 { 327 __cpuhp_remove_state(state, false); 328 } 329 330 static inline void cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state) 331 { 332 __cpuhp_remove_state_cpuslocked(state, false); 333 } 334 335 /** 336 * cpuhp_remove_multi_state - Remove hotplug multi state callback 337 * @state: The state for which the calls are removed 338 * 339 * Removes the callback functions from a multi state. This is the reverse of 340 * cpuhp_setup_state_multi(). All instances should have been removed before 341 * invoking this function. 342 */ 343 static inline void cpuhp_remove_multi_state(enum cpuhp_state state) 344 { 345 __cpuhp_remove_state(state, false); 346 } 347 348 int __cpuhp_state_remove_instance(enum cpuhp_state state, 349 struct hlist_node *node, bool invoke); 350 351 /** 352 * cpuhp_state_remove_instance - Remove hotplug instance from state and invoke 353 * the teardown callback 354 * @state: The state from which the instance is removed 355 * @node: The node for this individual state. 356 * 357 * Removes the instance and invokes the teardown callback on the present cpus 358 * which have already reached the @state. 359 */ 360 static inline int cpuhp_state_remove_instance(enum cpuhp_state state, 361 struct hlist_node *node) 362 { 363 return __cpuhp_state_remove_instance(state, node, true); 364 } 365 366 /** 367 * cpuhp_state_remove_instance_nocalls - Remove hotplug instance from state 368 * without invoking the reatdown callback 369 * @state: The state from which the instance is removed 370 * @node: The node for this individual state. 371 * 372 * Removes the instance without invoking the teardown callback. 373 */ 374 static inline int cpuhp_state_remove_instance_nocalls(enum cpuhp_state state, 375 struct hlist_node *node) 376 { 377 return __cpuhp_state_remove_instance(state, node, false); 378 } 379 380 #ifdef CONFIG_SMP 381 void cpuhp_online_idle(enum cpuhp_state state); 382 #else 383 static inline void cpuhp_online_idle(enum cpuhp_state state) { } 384 #endif 385 386 #endif 387