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_MICROCODE_LOADER,
105 CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
106 CPUHP_AP_PERF_X86_STARTING,
107 CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
108 CPUHP_AP_PERF_X86_CQM_STARTING,
109 CPUHP_AP_PERF_X86_CSTATE_STARTING,
110 CPUHP_AP_PERF_XTENSA_STARTING,
111 CPUHP_AP_MIPS_OP_LOONGSON3_STARTING,
112 CPUHP_AP_ARM_SDEI_STARTING,
113 CPUHP_AP_ARM_VFP_STARTING,
114 CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING,
115 CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING,
116 CPUHP_AP_PERF_ARM_ACPI_STARTING,
117 CPUHP_AP_PERF_ARM_STARTING,
118 CPUHP_AP_ARM_L2X0_STARTING,
119 CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
120 CPUHP_AP_ARM_ARCH_TIMER_STARTING,
121 CPUHP_AP_ARM_GLOBAL_TIMER_STARTING,
122 CPUHP_AP_JCORE_TIMER_STARTING,
123 CPUHP_AP_ARM_TWD_STARTING,
124 CPUHP_AP_QCOM_TIMER_STARTING,
125 CPUHP_AP_TEGRA_TIMER_STARTING,
126 CPUHP_AP_ARMADA_TIMER_STARTING,
127 CPUHP_AP_MARCO_TIMER_STARTING,
128 CPUHP_AP_MIPS_GIC_TIMER_STARTING,
129 CPUHP_AP_ARC_TIMER_STARTING,
130 CPUHP_AP_RISCV_TIMER_STARTING,
131 CPUHP_AP_CSKY_TIMER_STARTING,
132 CPUHP_AP_KVM_STARTING,
133 CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING,
134 CPUHP_AP_KVM_ARM_VGIC_STARTING,
135 CPUHP_AP_KVM_ARM_TIMER_STARTING,
136 /* Must be the last timer callback */
137 CPUHP_AP_DUMMY_TIMER_STARTING,
138 CPUHP_AP_ARM_XEN_STARTING,
139 CPUHP_AP_ARM_CORESIGHT_STARTING,
140 CPUHP_AP_ARM64_ISNDEP_STARTING,
141 CPUHP_AP_SMPCFD_DYING,
142 CPUHP_AP_X86_TBOOT_DYING,
143 CPUHP_AP_ARM_CACHE_B15_RAC_DYING,
144 CPUHP_AP_ONLINE,
145 CPUHP_TEARDOWN_CPU,
146 CPUHP_AP_ONLINE_IDLE,
147 CPUHP_AP_SMPBOOT_THREADS,
148 CPUHP_AP_X86_VDSO_VMA_ONLINE,
149 CPUHP_AP_IRQ_AFFINITY_ONLINE,
150 CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS,
151 CPUHP_AP_X86_INTEL_EPB_ONLINE,
152 CPUHP_AP_PERF_ONLINE,
153 CPUHP_AP_PERF_X86_ONLINE,
154 CPUHP_AP_PERF_X86_UNCORE_ONLINE,
155 CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE,
156 CPUHP_AP_PERF_X86_AMD_POWER_ONLINE,
157 CPUHP_AP_PERF_X86_RAPL_ONLINE,
158 CPUHP_AP_PERF_X86_CQM_ONLINE,
159 CPUHP_AP_PERF_X86_CSTATE_ONLINE,
160 CPUHP_AP_PERF_S390_CF_ONLINE,
161 CPUHP_AP_PERF_S390_SF_ONLINE,
162 CPUHP_AP_PERF_ARM_CCI_ONLINE,
163 CPUHP_AP_PERF_ARM_CCN_ONLINE,
164 CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
165 CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
166 CPUHP_AP_PERF_ARM_HISI_L3_ONLINE,
167 CPUHP_AP_PERF_ARM_L2X0_ONLINE,
168 CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
169 CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE,
170 CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE,
171 CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
172 CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE,
173 CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE,
174 CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE,
175 CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE,
176 CPUHP_AP_WATCHDOG_ONLINE,
177 CPUHP_AP_WORKQUEUE_ONLINE,
178 CPUHP_AP_RCUTREE_ONLINE,
179 CPUHP_AP_BASE_CACHEINFO_ONLINE,
180 CPUHP_AP_ONLINE_DYN,
181 CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30,
182 CPUHP_AP_X86_HPET_ONLINE,
183 CPUHP_AP_X86_KVM_CLK_ONLINE,
184 CPUHP_AP_ACTIVE,
185 CPUHP_ONLINE,
186 };
187
188 int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke,
189 int (*startup)(unsigned int cpu),
190 int (*teardown)(unsigned int cpu), bool multi_instance);
191
192 int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name,
193 bool invoke,
194 int (*startup)(unsigned int cpu),
195 int (*teardown)(unsigned int cpu),
196 bool multi_instance);
197 /**
198 * cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks
199 * @state: The state for which the calls are installed
200 * @name: Name of the callback (will be used in debug output)
201 * @startup: startup callback function
202 * @teardown: teardown callback function
203 *
204 * Installs the callback functions and invokes the startup callback on
205 * the present cpus which have already reached the @state.
206 */
cpuhp_setup_state(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))207 static inline int cpuhp_setup_state(enum cpuhp_state state,
208 const char *name,
209 int (*startup)(unsigned int cpu),
210 int (*teardown)(unsigned int cpu))
211 {
212 return __cpuhp_setup_state(state, name, true, startup, teardown, false);
213 }
214
cpuhp_setup_state_cpuslocked(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))215 static inline int cpuhp_setup_state_cpuslocked(enum cpuhp_state state,
216 const char *name,
217 int (*startup)(unsigned int cpu),
218 int (*teardown)(unsigned int cpu))
219 {
220 return __cpuhp_setup_state_cpuslocked(state, name, true, startup,
221 teardown, false);
222 }
223
224 /**
225 * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the
226 * callbacks
227 * @state: The state for which the calls are installed
228 * @name: Name of the callback.
229 * @startup: startup callback function
230 * @teardown: teardown callback function
231 *
232 * Same as @cpuhp_setup_state except that no calls are executed are invoked
233 * during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n.
234 */
cpuhp_setup_state_nocalls(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))235 static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state,
236 const char *name,
237 int (*startup)(unsigned int cpu),
238 int (*teardown)(unsigned int cpu))
239 {
240 return __cpuhp_setup_state(state, name, false, startup, teardown,
241 false);
242 }
243
cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))244 static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state,
245 const char *name,
246 int (*startup)(unsigned int cpu),
247 int (*teardown)(unsigned int cpu))
248 {
249 return __cpuhp_setup_state_cpuslocked(state, name, false, startup,
250 teardown, false);
251 }
252
253 /**
254 * cpuhp_setup_state_multi - Add callbacks for multi state
255 * @state: The state for which the calls are installed
256 * @name: Name of the callback.
257 * @startup: startup callback function
258 * @teardown: teardown callback function
259 *
260 * Sets the internal multi_instance flag and prepares a state to work as a multi
261 * instance callback. No callbacks are invoked at this point. The callbacks are
262 * invoked once an instance for this state are registered via
263 * @cpuhp_state_add_instance or @cpuhp_state_add_instance_nocalls.
264 */
cpuhp_setup_state_multi(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu,struct hlist_node * node),int (* teardown)(unsigned int cpu,struct hlist_node * node))265 static inline int cpuhp_setup_state_multi(enum cpuhp_state state,
266 const char *name,
267 int (*startup)(unsigned int cpu,
268 struct hlist_node *node),
269 int (*teardown)(unsigned int cpu,
270 struct hlist_node *node))
271 {
272 return __cpuhp_setup_state(state, name, false,
273 (void *) startup,
274 (void *) teardown, true);
275 }
276
277 int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
278 bool invoke);
279 int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state,
280 struct hlist_node *node, bool invoke);
281
282 /**
283 * cpuhp_state_add_instance - Add an instance for a state and invoke startup
284 * callback.
285 * @state: The state for which the instance is installed
286 * @node: The node for this individual state.
287 *
288 * Installs the instance for the @state and invokes the startup callback on
289 * the present cpus which have already reached the @state. The @state must have
290 * been earlier marked as multi-instance by @cpuhp_setup_state_multi.
291 */
cpuhp_state_add_instance(enum cpuhp_state state,struct hlist_node * node)292 static inline int cpuhp_state_add_instance(enum cpuhp_state state,
293 struct hlist_node *node)
294 {
295 return __cpuhp_state_add_instance(state, node, true);
296 }
297
298 /**
299 * cpuhp_state_add_instance_nocalls - Add an instance for a state without
300 * invoking the startup callback.
301 * @state: The state for which the instance is installed
302 * @node: The node for this individual state.
303 *
304 * Installs the instance for the @state The @state must have been earlier
305 * marked as multi-instance by @cpuhp_setup_state_multi.
306 */
cpuhp_state_add_instance_nocalls(enum cpuhp_state state,struct hlist_node * node)307 static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state,
308 struct hlist_node *node)
309 {
310 return __cpuhp_state_add_instance(state, node, false);
311 }
312
313 static inline int
cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state,struct hlist_node * node)314 cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state,
315 struct hlist_node *node)
316 {
317 return __cpuhp_state_add_instance_cpuslocked(state, node, false);
318 }
319
320 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
321 void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke);
322
323 /**
324 * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown
325 * @state: The state for which the calls are removed
326 *
327 * Removes the callback functions and invokes the teardown callback on
328 * the present cpus which have already reached the @state.
329 */
cpuhp_remove_state(enum cpuhp_state state)330 static inline void cpuhp_remove_state(enum cpuhp_state state)
331 {
332 __cpuhp_remove_state(state, true);
333 }
334
335 /**
336 * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking
337 * teardown
338 * @state: The state for which the calls are removed
339 */
cpuhp_remove_state_nocalls(enum cpuhp_state state)340 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state)
341 {
342 __cpuhp_remove_state(state, false);
343 }
344
cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state)345 static inline void cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state)
346 {
347 __cpuhp_remove_state_cpuslocked(state, false);
348 }
349
350 /**
351 * cpuhp_remove_multi_state - Remove hotplug multi state callback
352 * @state: The state for which the calls are removed
353 *
354 * Removes the callback functions from a multi state. This is the reverse of
355 * cpuhp_setup_state_multi(). All instances should have been removed before
356 * invoking this function.
357 */
cpuhp_remove_multi_state(enum cpuhp_state state)358 static inline void cpuhp_remove_multi_state(enum cpuhp_state state)
359 {
360 __cpuhp_remove_state(state, false);
361 }
362
363 int __cpuhp_state_remove_instance(enum cpuhp_state state,
364 struct hlist_node *node, bool invoke);
365
366 /**
367 * cpuhp_state_remove_instance - Remove hotplug instance from state and invoke
368 * the teardown callback
369 * @state: The state from which the instance is removed
370 * @node: The node for this individual state.
371 *
372 * Removes the instance and invokes the teardown callback on the present cpus
373 * which have already reached the @state.
374 */
cpuhp_state_remove_instance(enum cpuhp_state state,struct hlist_node * node)375 static inline int cpuhp_state_remove_instance(enum cpuhp_state state,
376 struct hlist_node *node)
377 {
378 return __cpuhp_state_remove_instance(state, node, true);
379 }
380
381 /**
382 * cpuhp_state_remove_instance_nocalls - Remove hotplug instance from state
383 * without invoking the reatdown callback
384 * @state: The state from which the instance is removed
385 * @node: The node for this individual state.
386 *
387 * Removes the instance without invoking the teardown callback.
388 */
cpuhp_state_remove_instance_nocalls(enum cpuhp_state state,struct hlist_node * node)389 static inline int cpuhp_state_remove_instance_nocalls(enum cpuhp_state state,
390 struct hlist_node *node)
391 {
392 return __cpuhp_state_remove_instance(state, node, false);
393 }
394
395 #ifdef CONFIG_SMP
396 void cpuhp_online_idle(enum cpuhp_state state);
397 #else
cpuhp_online_idle(enum cpuhp_state state)398 static inline void cpuhp_online_idle(enum cpuhp_state state) { }
399 #endif
400
401 #endif
402
