1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright IBM Corp. 1999, 2012
4 * Author(s): Denis Joseph Barrow,
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>,
6 */
7 #ifndef __ASM_SMP_H
8 #define __ASM_SMP_H
9
10 #include <asm/processor.h>
11 #include <asm/lowcore.h>
12 #include <asm/machine.h>
13 #include <asm/sigp.h>
14
raw_smp_processor_id(void)15 static __always_inline unsigned int raw_smp_processor_id(void)
16 {
17 unsigned long lc_cpu_nr;
18 unsigned int cpu;
19
20 BUILD_BUG_ON(sizeof_field(struct lowcore, cpu_nr) != sizeof(cpu));
21 lc_cpu_nr = offsetof(struct lowcore, cpu_nr);
22 asm_inline(
23 ALTERNATIVE(" ly %[cpu],%[offzero](%%r0)\n",
24 " ly %[cpu],%[offalt](%%r0)\n",
25 ALT_FEATURE(MFEATURE_LOWCORE))
26 : [cpu] "=d" (cpu)
27 : [offzero] "i" (lc_cpu_nr),
28 [offalt] "i" (lc_cpu_nr + LOWCORE_ALT_ADDRESS),
29 "m" (((struct lowcore *)0)->cpu_nr));
30 return cpu;
31 }
32
33 #define arch_scale_cpu_capacity smp_cpu_get_capacity
34
35 extern struct mutex smp_cpu_state_mutex;
36 extern unsigned int smp_cpu_mt_shift;
37 extern unsigned int smp_cpu_mtid;
38 extern __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS];
39 extern cpumask_t cpu_setup_mask;
40
41 extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
42
43 extern void arch_send_call_function_single_ipi(int cpu);
44 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
45
46 extern void smp_call_ipl_cpu(void (*func)(void *), void *);
47 extern void smp_emergency_stop(void);
48
49 extern int smp_find_processor_id(u16 address);
50 extern int smp_store_status(int cpu);
51 extern void smp_save_dump_ipl_cpu(void);
52 extern void smp_save_dump_secondary_cpus(void);
53 extern void smp_yield_cpu(int cpu);
54 extern void smp_cpu_set_polarization(int cpu, int val);
55 extern int smp_cpu_get_polarization(int cpu);
56 extern void smp_cpu_set_capacity(int cpu, unsigned long val);
57 extern void smp_set_core_capacity(int cpu, unsigned long val);
58 extern unsigned long smp_cpu_get_capacity(int cpu);
59 extern int smp_cpu_get_cpu_address(int cpu);
60 extern void smp_fill_possible_mask(void);
61 extern void smp_detect_cpus(void);
62
smp_stop_cpu(void)63 static inline void smp_stop_cpu(void)
64 {
65 u16 pcpu = stap();
66
67 for (;;) {
68 __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
69 cpu_relax();
70 }
71 }
72
73 /* Return thread 0 CPU number as base CPU */
smp_get_base_cpu(int cpu)74 static inline int smp_get_base_cpu(int cpu)
75 {
76 return cpu - (cpu % (smp_cpu_mtid + 1));
77 }
78
smp_cpus_done(unsigned int max_cpus)79 static inline void smp_cpus_done(unsigned int max_cpus)
80 {
81 }
82
83 extern int smp_rescan_cpus(bool early);
84 extern void __noreturn cpu_die(void);
85 extern void __cpu_die(unsigned int cpu);
86 extern int __cpu_disable(void);
87 extern void schedule_mcck_handler(void);
88 void notrace smp_yield_cpu(int cpu);
89
90 #endif /* __ASM_SMP_H */
91