Linux kernel mirror (for testing)
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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
25enum 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
173int __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
177int __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 */
192static 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
200static 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 */
220static 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
229static 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 */
250static 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
262int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
263 bool invoke);
264int __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 */
277static 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 */
292static 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
298static inline int
299cpuhp_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
305void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
306void __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 */
315static 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 */
325static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state)
326{
327 __cpuhp_remove_state(state, false);
328}
329
330static 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 */
343static inline void cpuhp_remove_multi_state(enum cpuhp_state state)
344{
345 __cpuhp_remove_state(state, false);
346}
347
348int __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 */
360static 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 */
374static 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
381void cpuhp_online_idle(enum cpuhp_state state);
382#else
383static inline void cpuhp_online_idle(enum cpuhp_state state) { }
384#endif
385
386#endif