arch/ia64/include/asm/smp.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * SMP Support
   4  *
   5  * Copyright (C) 1999 VA Linux Systems
   6  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   7  * (c) Copyright 2001-2003, 2005 Hewlett-Packard Development Company, L.P.
   8  *      David Mosberger-Tang <davidm@hpl.hp.com>
   9  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
  10  */
  11 #ifndef _ASM_IA64_SMP_H
  12 #define _ASM_IA64_SMP_H
  13
  14 #include <linux/init.h>
  15 #include <linux/threads.h>
  16 #include <linux/kernel.h>
  17 #include <linux/cpumask.h>
  18 #include <linux/bitops.h>
  19 #include <linux/irqreturn.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/param.h>
  23 #include <asm/processor.h>
  24 #include <asm/ptrace.h>
  25
  26 static inline unsigned int
  27 ia64_get_lid (void)
  28 {
  29         union {
  30                 struct {
  31                         unsigned long reserved : 16;
  32                         unsigned long eid : 8;
  33                         unsigned long id : 8;
  34                         unsigned long ignored : 32;
  35                 } f;
  36                 unsigned long bits;
  37         } lid;
  38
  39         lid.bits = ia64_getreg(_IA64_REG_CR_LID);
  40         return lid.f.id << 8 | lid.f.eid;
  41 }
  42
  43 #define hard_smp_processor_id()         ia64_get_lid()
  44
  45 #ifdef CONFIG_SMP
  46
  47 #define XTP_OFFSET              0x1e0008
  48
  49 #define SMP_IRQ_REDIRECTION     (1 << 0)
  50 #define SMP_IPI_REDIRECTION     (1 << 1)
  51
  52 #define raw_smp_processor_id() (current_thread_info()->cpu)
  53
  54 extern struct smp_boot_data {
  55         int cpu_count;
  56         int cpu_phys_id[NR_CPUS];
  57 } smp_boot_data __initdata;
  58
  59 extern char no_int_routing;
  60
  61 extern cpumask_t cpu_core_map[NR_CPUS];
  62 DECLARE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
  63 extern int smp_num_siblings;
  64 extern void __iomem *ipi_base_addr;
  65 extern unsigned char smp_int_redirect;
  66
  67 extern volatile int ia64_cpu_to_sapicid[];
  68 #define cpu_physical_id(i)      ia64_cpu_to_sapicid[i]
  69
  70 extern unsigned long ap_wakeup_vector;
  71
  72 /*
  73  * Function to map hard smp processor id to logical id.  Slow, so don't use this in
  74  * performance-critical code.
  75  */
  76 static inline int
  77 cpu_logical_id (int cpuid)
  78 {
  79         int i;
  80
  81         for (i = 0; i < NR_CPUS; ++i)
  82                 if (cpu_physical_id(i) == cpuid)
  83                         break;
  84         return i;
  85 }
  86
  87 /*
  88  * XTP control functions:
  89  *      min_xtp   : route all interrupts to this CPU
  90  *      normal_xtp: nominal XTP value
  91  *      max_xtp   : never deliver interrupts to this CPU.
  92  */
  93
  94 static inline void
  95 min_xtp (void)
  96 {
  97         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
  98                 writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */
  99 }
 100
 101 static inline void
 102 normal_xtp (void)
 103 {
 104         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
 105                 writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */
 106 }
 107
 108 static inline void
 109 max_xtp (void)
 110 {
 111         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
 112                 writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */
 113 }
 114
 115 /* Upping and downing of CPUs */
 116 extern int __cpu_disable (void);
 117 extern void __cpu_die (unsigned int cpu);
 118 extern void cpu_die (void) __attribute__ ((noreturn));
 119 extern void __init smp_build_cpu_map(void);
 120
 121 extern void __init init_smp_config (void);
 122 extern void smp_do_timer (struct pt_regs *regs);
 123
 124 extern irqreturn_t handle_IPI(int irq, void *dev_id);
 125 extern void smp_send_reschedule (int cpu);
 126 extern void identify_siblings (struct cpuinfo_ia64 *);
 127 extern int is_multithreading_enabled(void);
 128
 129 extern void arch_send_call_function_single_ipi(int cpu);
 130 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
 131
 132 #else /* CONFIG_SMP */
 133
 134 #define cpu_logical_id(i)               0
 135 #define cpu_physical_id(i)              ia64_get_lid()
 136
 137 #endif /* CONFIG_SMP */
 138 #endif /* _ASM_IA64_SMP_H */