LXR linux/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 */
  26void init_messaging(void);
  27
  28/* Set up this tile to support receiving device interrupts and IPIs. */
  29void init_per_tile_IRQs(void);
  30
  31/* Send a message to processors specified in mask */
  32void send_IPI_many(const struct cpumask *mask, int tag);
  33
  34/* Send a message to all but the sending processor */
  35void send_IPI_allbutself(int tag);
  36
  37/* Send a message to a specific processor */
  38void send_IPI_single(int dest, int tag);
  39
  40/* Process an IPI message */
  41void evaluate_message(int tag);
  42
  43/* Boot a secondary cpu */
  44void online_secondary(void);
  45
  46/* Call a function on a specified set of CPUs (may include this one). */
  47extern 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 */
  51extern 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. */
  58static inline int cpu_x(int cpu)
  59{
  60        return cpu % smp_width;
  61}
  62static inline int cpu_y(int cpu)
  63{
  64        return cpu / smp_width;
  65}
  66static 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. */
  78static 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. */
  84static 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. */
  90void 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. */
 108extern 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 */
 113extern struct cpumask hash_for_home_map;
 114#endif
 115
 116/* Which cpus can have their cache flushed by hv_flush_remote(). */
 117extern 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. */
 121static 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 */
 131int 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)
 135static 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. */
 142void ipi_init(void);
 143
 144/* Function for start-cpu message to cause us to jump to. */
 145extern unsigned long start_cpu_function_addr;
 146
 147#endif /* _ASM_TILE_SMP_H */
 148