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_POWER, 33 CPUHP_PERF_SUPERH, 34 CPUHP_X86_HPET_DEAD, 35 CPUHP_X86_APB_DEAD, 36 CPUHP_X86_MCE_DEAD, 37 CPUHP_VIRT_NET_DEAD, 38 CPUHP_SLUB_DEAD, 39 CPUHP_MM_WRITEBACK_DEAD, 40 CPUHP_MM_VMSTAT_DEAD, 41 CPUHP_SOFTIRQ_DEAD, 42 CPUHP_NET_MVNETA_DEAD, 43 CPUHP_CPUIDLE_DEAD, 44 CPUHP_ARM64_FPSIMD_DEAD, 45 CPUHP_ARM_OMAP_WAKE_DEAD, 46 CPUHP_IRQ_POLL_DEAD, 47 CPUHP_BLOCK_SOFTIRQ_DEAD, 48 CPUHP_ACPI_CPUDRV_DEAD, 49 CPUHP_S390_PFAULT_DEAD, 50 CPUHP_BLK_MQ_DEAD, 51 CPUHP_FS_BUFF_DEAD, 52 CPUHP_PRINTK_DEAD, 53 CPUHP_MM_MEMCQ_DEAD, 54 CPUHP_PERCPU_CNT_DEAD, 55 CPUHP_RADIX_DEAD, 56 CPUHP_PAGE_ALLOC_DEAD, 57 CPUHP_NET_DEV_DEAD, 58 CPUHP_PCI_XGENE_DEAD, 59 CPUHP_IOMMU_INTEL_DEAD, 60 CPUHP_LUSTRE_CFS_DEAD, 61 CPUHP_AP_ARM_CACHE_B15_RAC_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_PREPARE, 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_IRQ_MIPS_GIC_STARTING, 103 CPUHP_AP_ARM_MVEBU_COHERENCY, 104 CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING, 105 CPUHP_AP_PERF_X86_STARTING, 106 CPUHP_AP_PERF_X86_AMD_IBS_STARTING, 107 CPUHP_AP_PERF_X86_CQM_STARTING, 108 CPUHP_AP_PERF_X86_CSTATE_STARTING, 109 CPUHP_AP_PERF_XTENSA_STARTING, 110 CPUHP_AP_MIPS_OP_LOONGSON3_STARTING, 111 CPUHP_AP_ARM_SDEI_STARTING, 112 CPUHP_AP_ARM_VFP_STARTING, 113 CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING, 114 CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING, 115 CPUHP_AP_PERF_ARM_ACPI_STARTING, 116 CPUHP_AP_PERF_ARM_STARTING, 117 CPUHP_AP_ARM_L2X0_STARTING, 118 CPUHP_AP_ARM_ARCH_TIMER_STARTING, 119 CPUHP_AP_ARM_GLOBAL_TIMER_STARTING, 120 CPUHP_AP_JCORE_TIMER_STARTING, 121 CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING, 122 CPUHP_AP_ARM_TWD_STARTING, 123 CPUHP_AP_QCOM_TIMER_STARTING, 124 CPUHP_AP_TEGRA_TIMER_STARTING, 125 CPUHP_AP_ARMADA_TIMER_STARTING, 126 CPUHP_AP_MARCO_TIMER_STARTING, 127 CPUHP_AP_MIPS_GIC_TIMER_STARTING, 128 CPUHP_AP_ARC_TIMER_STARTING, 129 CPUHP_AP_RISCV_TIMER_STARTING, 130 CPUHP_AP_CSKY_TIMER_STARTING, 131 CPUHP_AP_KVM_STARTING, 132 CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING, 133 CPUHP_AP_KVM_ARM_VGIC_STARTING, 134 CPUHP_AP_KVM_ARM_TIMER_STARTING, 135 /* Must be the last timer callback */ 136 CPUHP_AP_DUMMY_TIMER_STARTING, 137 CPUHP_AP_ARM_XEN_STARTING, 138 CPUHP_AP_ARM_CORESIGHT_STARTING, 139 CPUHP_AP_ARM64_ISNDEP_STARTING, 140 CPUHP_AP_SMPCFD_DYING, 141 CPUHP_AP_X86_TBOOT_DYING, 142 CPUHP_AP_ARM_CACHE_B15_RAC_DYING, 143 CPUHP_AP_ONLINE, 144 CPUHP_TEARDOWN_CPU, 145 CPUHP_AP_ONLINE_IDLE, 146 CPUHP_AP_SMPBOOT_THREADS, 147 CPUHP_AP_X86_VDSO_VMA_ONLINE, 148 CPUHP_AP_IRQ_AFFINITY_ONLINE, 149 CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS, 150 CPUHP_AP_X86_INTEL_EPB_ONLINE, 151 CPUHP_AP_PERF_ONLINE, 152 CPUHP_AP_PERF_X86_ONLINE, 153 CPUHP_AP_PERF_X86_UNCORE_ONLINE, 154 CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE, 155 CPUHP_AP_PERF_X86_AMD_POWER_ONLINE, 156 CPUHP_AP_PERF_X86_RAPL_ONLINE, 157 CPUHP_AP_PERF_X86_CQM_ONLINE, 158 CPUHP_AP_PERF_X86_CSTATE_ONLINE, 159 CPUHP_AP_PERF_S390_CF_ONLINE, 160 CPUHP_AP_PERF_S390_SF_ONLINE, 161 CPUHP_AP_PERF_ARM_CCI_ONLINE, 162 CPUHP_AP_PERF_ARM_CCN_ONLINE, 163 CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE, 164 CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE, 165 CPUHP_AP_PERF_ARM_HISI_L3_ONLINE, 166 CPUHP_AP_PERF_ARM_L2X0_ONLINE, 167 CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE, 168 CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE, 169 CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE, 170 CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE, 171 CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE, 172 CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE, 173 CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE, 174 CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE, 175 CPUHP_AP_WATCHDOG_ONLINE, 176 CPUHP_AP_WORKQUEUE_ONLINE, 177 CPUHP_AP_RCUTREE_ONLINE, 178 CPUHP_AP_ONLINE_DYN, 179 CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30, 180 CPUHP_AP_X86_HPET_ONLINE, 181 CPUHP_AP_X86_KVM_CLK_ONLINE, 182 CPUHP_AP_ACTIVE, 183 CPUHP_ONLINE, 184 }; 185 186 int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke, 187 int (*startup)(unsigned int cpu), 188 int (*teardown)(unsigned int cpu), bool multi_instance); 189 190 int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name, 191 bool invoke, 192 int (*startup)(unsigned int cpu), 193 int (*teardown)(unsigned int cpu), 194 bool multi_instance); 195 /** 196 * cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks 197 * @state: The state for which the calls are installed 198 * @name: Name of the callback (will be used in debug output) 199 * @startup: startup callback function 200 * @teardown: teardown callback function 201 * 202 * Installs the callback functions and invokes the startup callback on 203 * the present cpus which have already reached the @state. 204 */ 205 static inline int cpuhp_setup_state(enum cpuhp_state state, 206 const char *name, 207 int (*startup)(unsigned int cpu), 208 int (*teardown)(unsigned int cpu)) 209 { 210 return __cpuhp_setup_state(state, name, true, startup, teardown, false); 211 } 212 213 static inline int cpuhp_setup_state_cpuslocked(enum cpuhp_state state, 214 const char *name, 215 int (*startup)(unsigned int cpu), 216 int (*teardown)(unsigned int cpu)) 217 { 218 return __cpuhp_setup_state_cpuslocked(state, name, true, startup, 219 teardown, false); 220 } 221 222 /** 223 * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the 224 * callbacks 225 * @state: The state for which the calls are installed 226 * @name: Name of the callback. 227 * @startup: startup callback function 228 * @teardown: teardown callback function 229 * 230 * Same as @cpuhp_setup_state except that no calls are executed are invoked 231 * during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n. 232 */ 233 static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state, 234 const char *name, 235 int (*startup)(unsigned int cpu), 236 int (*teardown)(unsigned int cpu)) 237 { 238 return __cpuhp_setup_state(state, name, false, startup, teardown, 239 false); 240 } 241 242 static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state, 243 const char *name, 244 int (*startup)(unsigned int cpu), 245 int (*teardown)(unsigned int cpu)) 246 { 247 return __cpuhp_setup_state_cpuslocked(state, name, false, startup, 248 teardown, false); 249 } 250 251 /** 252 * cpuhp_setup_state_multi - Add callbacks for multi state 253 * @state: The state for which the calls are installed 254 * @name: Name of the callback. 255 * @startup: startup callback function 256 * @teardown: teardown callback function 257 * 258 * Sets the internal multi_instance flag and prepares a state to work as a multi 259 * instance callback. No callbacks are invoked at this point. The callbacks are 260 * invoked once an instance for this state are registered via 261 * @cpuhp_state_add_instance or @cpuhp_state_add_instance_nocalls. 262 */ 263 static inline int cpuhp_setup_state_multi(enum cpuhp_state state, 264 const char *name, 265 int (*startup)(unsigned int cpu, 266 struct hlist_node *node), 267 int (*teardown)(unsigned int cpu, 268 struct hlist_node *node)) 269 { 270 return __cpuhp_setup_state(state, name, false, 271 (void *) startup, 272 (void *) teardown, true); 273 } 274 275 int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node, 276 bool invoke); 277 int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state, 278 struct hlist_node *node, bool invoke); 279 280 /** 281 * cpuhp_state_add_instance - Add an instance for a state and invoke startup 282 * callback. 283 * @state: The state for which the instance is installed 284 * @node: The node for this individual state. 285 * 286 * Installs the instance for the @state and invokes the startup callback on 287 * the present cpus which have already reached the @state. The @state must have 288 * been earlier marked as multi-instance by @cpuhp_setup_state_multi. 289 */ 290 static inline int cpuhp_state_add_instance(enum cpuhp_state state, 291 struct hlist_node *node) 292 { 293 return __cpuhp_state_add_instance(state, node, true); 294 } 295 296 /** 297 * cpuhp_state_add_instance_nocalls - Add an instance for a state without 298 * invoking the startup callback. 299 * @state: The state for which the instance is installed 300 * @node: The node for this individual state. 301 * 302 * Installs the instance for the @state The @state must have been earlier 303 * marked as multi-instance by @cpuhp_setup_state_multi. 304 */ 305 static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state, 306 struct hlist_node *node) 307 { 308 return __cpuhp_state_add_instance(state, node, false); 309 } 310 311 static inline int 312 cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state, 313 struct hlist_node *node) 314 { 315 return __cpuhp_state_add_instance_cpuslocked(state, node, false); 316 } 317 318 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke); 319 void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke); 320 321 /** 322 * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown 323 * @state: The state for which the calls are removed 324 * 325 * Removes the callback functions and invokes the teardown callback on 326 * the present cpus which have already reached the @state. 327 */ 328 static inline void cpuhp_remove_state(enum cpuhp_state state) 329 { 330 __cpuhp_remove_state(state, true); 331 } 332 333 /** 334 * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking 335 * teardown 336 * @state: The state for which the calls are removed 337 */ 338 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state) 339 { 340 __cpuhp_remove_state(state, false); 341 } 342 343 static inline void cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state) 344 { 345 __cpuhp_remove_state_cpuslocked(state, false); 346 } 347 348 /** 349 * cpuhp_remove_multi_state - Remove hotplug multi state callback 350 * @state: The state for which the calls are removed 351 * 352 * Removes the callback functions from a multi state. This is the reverse of 353 * cpuhp_setup_state_multi(). All instances should have been removed before 354 * invoking this function. 355 */ 356 static inline void cpuhp_remove_multi_state(enum cpuhp_state state) 357 { 358 __cpuhp_remove_state(state, false); 359 } 360 361 int __cpuhp_state_remove_instance(enum cpuhp_state state, 362 struct hlist_node *node, bool invoke); 363 364 /** 365 * cpuhp_state_remove_instance - Remove hotplug instance from state and invoke 366 * the teardown callback 367 * @state: The state from which the instance is removed 368 * @node: The node for this individual state. 369 * 370 * Removes the instance and invokes the teardown callback on the present cpus 371 * which have already reached the @state. 372 */ 373 static inline int cpuhp_state_remove_instance(enum cpuhp_state state, 374 struct hlist_node *node) 375 { 376 return __cpuhp_state_remove_instance(state, node, true); 377 } 378 379 /** 380 * cpuhp_state_remove_instance_nocalls - Remove hotplug instance from state 381 * without invoking the reatdown callback 382 * @state: The state from which the instance is removed 383 * @node: The node for this individual state. 384 * 385 * Removes the instance without invoking the teardown callback. 386 */ 387 static inline int cpuhp_state_remove_instance_nocalls(enum cpuhp_state state, 388 struct hlist_node *node) 389 { 390 return __cpuhp_state_remove_instance(state, node, false); 391 } 392 393 #ifdef CONFIG_SMP 394 void cpuhp_online_idle(enum cpuhp_state state); 395 #else 396 static inline void cpuhp_online_idle(enum cpuhp_state state) { } 397 #endif 398 399 #endif 400