arch/tile/include/asm/smp.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef _ASM_TILE_SMP_H
  16 #define _ASM_TILE_SMP_H
  17
  18 #ifdef CONFIG_SMP
  19
  20 #include <asm/processor.h>
  21 #include <linux/cpumask.h>
  22 #include <linux/irqreturn.h>
  23 #include <hv/hypervisor.h>
  24
  25 /* Set up this tile to support receiving hypervisor messages */
  26 void init_messaging(void);
  27
  28 /* Set up this tile to support receiving device interrupts and IPIs. */
  29 void init_per_tile_IRQs(void);
  30
  31 /* Send a message to processors specified in mask */
  32 void send_IPI_many(const struct cpumask *mask, int tag);
  33
  34 /* Send a message to all but the sending processor */
  35 void send_IPI_allbutself(int tag);
  36
  37 /* Send a message to a specific processor */
  38 void send_IPI_single(int dest, int tag);
  39
  40 /* Process an IPI message */
  41 void evaluate_message(int tag);
  42
  43 /* Boot a secondary cpu */
  44 void online_secondary(void);
  45
  46 /* Call a function on a specified set of CPUs (may include this one). */
  47 extern void on_each_cpu_mask(const struct cpumask *mask,
  48                              void (*func)(void *), void *info, bool wait);
  49
  50 /* Topology of the supervisor tile grid, and coordinates of boot processor */
  51 extern HV_Topology smp_topology;
  52
  53 /* Accessors for grid size */
  54 #define smp_height              (smp_topology.height)
  55 #define smp_width               (smp_topology.width)
  56
  57 /* Convenience functions for converting cpu <-> coords. */
  58 static inline int cpu_x(int cpu)
  59 {
  60         return cpu % smp_width;
  61 }
  62 static inline int cpu_y(int cpu)
  63 {
  64         return cpu / smp_width;
  65 }
  66 static inline int xy_to_cpu(int x, int y)
  67 {
  68         return y * smp_width + x;
  69 }
  70
  71 /* Hypervisor message tags sent via the tile send_IPI*() routines. */
  72 #define MSG_TAG_START_CPU               1
  73 #define MSG_TAG_STOP_CPU                2
  74 #define MSG_TAG_CALL_FUNCTION_MANY      3
  75 #define MSG_TAG_CALL_FUNCTION_SINGLE    4
  76
  77 /* Hook for the generic smp_call_function_many() routine. */
  78 static inline void arch_send_call_function_ipi_mask(struct cpumask *mask)
  79 {
  80         send_IPI_many(mask, MSG_TAG_CALL_FUNCTION_MANY);
  81 }
  82
  83 /* Hook for the generic smp_call_function_single() routine. */
  84 static inline void arch_send_call_function_single_ipi(int cpu)
  85 {
  86         send_IPI_single(cpu, MSG_TAG_CALL_FUNCTION_SINGLE);
  87 }
  88
  89 /* Print out the boot string describing which cpus were disabled. */
  90 void print_disabled_cpus(void);
  91
  92 #else /* !CONFIG_SMP */
  93
  94 #define on_each_cpu_mask(mask, func, info, wait)                \
  95   do { if (cpumask_test_cpu(0, (mask))) func(info); } while (0)
  96
  97 #define smp_master_cpu          0
  98 #define smp_height              1
  99 #define smp_width               1
 100 #define cpu_x(cpu)              0
 101 #define cpu_y(cpu)              0
 102 #define xy_to_cpu(x, y)         0
 103
 104 #endif /* !CONFIG_SMP */
 105
 106
 107 /* Which cpus may be used as the lotar in a page table entry. */
 108 extern struct cpumask cpu_lotar_map;
 109 #define cpu_is_valid_lotar(cpu) cpumask_test_cpu((cpu), &cpu_lotar_map)
 110
 111 #if CHIP_HAS_CBOX_HOME_MAP()
 112 /* Which processors are used for hash-for-home mapping */
 113 extern struct cpumask hash_for_home_map;
 114 #endif
 115
 116 /* Which cpus can have their cache flushed by hv_flush_remote(). */
 117 extern struct cpumask cpu_cacheable_map;
 118 #define cpu_cacheable(cpu) cpumask_test_cpu((cpu), &cpu_cacheable_map)
 119
 120 /* Convert an HV_LOTAR value into a cpu. */
 121 static inline int hv_lotar_to_cpu(HV_LOTAR lotar)
 122 {
 123         return HV_LOTAR_X(lotar) + (HV_LOTAR_Y(lotar) * smp_width);
 124 }
 125
 126 /*
 127  * Extension of <linux/cpumask.h> functionality when you just want
 128  * to express a mask or suppression or inclusion region without
 129  * being too concerned about exactly which cpus are valid in that region.
 130  */
 131 int bitmap_parselist_crop(const char *bp, unsigned long *maskp, int nmaskbits);
 132
 133 #define cpulist_parse_crop(buf, dst) \
 134                         __cpulist_parse_crop((buf), (dst), NR_CPUS)
 135 static inline int __cpulist_parse_crop(const char *buf, struct cpumask *dstp,
 136                                         int nbits)
 137 {
 138         return bitmap_parselist_crop(buf, cpumask_bits(dstp), nbits);
 139 }
 140
 141 /* Initialize the IPI subsystem. */
 142 void ipi_init(void);
 143
 144 /* Function for start-cpu message to cause us to jump to. */
 145 extern unsigned long start_cpu_function_addr;
 146
 147 #endif /* _ASM_TILE_SMP_H */