arch/s390/include/asm/smp.h

   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  *               Heiko Carstens <heiko.carstens@de.ibm.com>,
   7  */
   8 #ifndef __ASM_SMP_H
   9 #define __ASM_SMP_H
  10
  11 #include <asm/sigp.h>
  12 #include <asm/lowcore.h>
  13 #include <asm/processor.h>
  14
  15 #define raw_smp_processor_id()  (S390_lowcore.cpu_nr)
  16
  17 extern struct mutex smp_cpu_state_mutex;
  18 extern unsigned int smp_cpu_mt_shift;
  19 extern unsigned int smp_cpu_mtid;
  20 extern __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS];
  21
  22 extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
  23
  24 extern void arch_send_call_function_single_ipi(int cpu);
  25 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
  26
  27 extern void smp_call_online_cpu(void (*func)(void *), void *);
  28 extern void smp_call_ipl_cpu(void (*func)(void *), void *);
  29 extern void smp_emergency_stop(void);
  30
  31 extern int smp_find_processor_id(u16 address);
  32 extern int smp_store_status(int cpu);
  33 extern void smp_save_dump_cpus(void);
  34 extern void smp_yield_cpu(int cpu);
  35 extern void smp_cpu_set_polarization(int cpu, int val);
  36 extern int smp_cpu_get_polarization(int cpu);
  37 extern int smp_cpu_get_cpu_address(int cpu);
  38 extern void smp_fill_possible_mask(void);
  39 extern void smp_detect_cpus(void);
  40
  41 static inline void smp_stop_cpu(void)
  42 {
  43         u16 pcpu = stap();
  44
  45         for (;;) {
  46                 __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
  47                 cpu_relax();
  48         }
  49 }
  50
  51 /* Return thread 0 CPU number as base CPU */
  52 static inline int smp_get_base_cpu(int cpu)
  53 {
  54         return cpu - (cpu % (smp_cpu_mtid + 1));
  55 }
  56
  57 static inline void smp_cpus_done(unsigned int max_cpus)
  58 {
  59 }
  60
  61 extern int smp_rescan_cpus(void);
  62 extern void __noreturn cpu_die(void);
  63 extern void __cpu_die(unsigned int cpu);
  64 extern int __cpu_disable(void);
  65 extern void schedule_mcck_handler(void);
  66
  67 #endif /* __ASM_SMP_H */