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/* Topology of the supervisor tile grid, and coordinates of boot processor */
  47extern HV_Topology smp_topology;
  48
  49/* Accessors for grid size */
  50#define smp_height              (smp_topology.height)
  51#define smp_width               (smp_topology.width)
  52
  53/* Convenience functions for converting cpu <-> coords. */
  54static inline int cpu_x(int cpu)
  55{
  56        return cpu % smp_width;
  57}
  58static inline int cpu_y(int cpu)
  59{
  60        return cpu / smp_width;
  61}
  62static inline int xy_to_cpu(int x, int y)
  63{
  64        return y * smp_width + x;
  65}
  66
  67/* Hypervisor message tags sent via the tile send_IPI*() routines. */
  68#define MSG_TAG_START_CPU               1
  69#define MSG_TAG_STOP_CPU                2
  70#define MSG_TAG_CALL_FUNCTION_MANY      3
  71#define MSG_TAG_CALL_FUNCTION_SINGLE    4
  72#define MSG_TAG_IRQ_WORK                5
  73
  74/* Hook for the generic smp_call_function_many() routine. */
  75static inline void arch_send_call_function_ipi_mask(struct cpumask *mask)
  76{
  77        send_IPI_many(mask, MSG_TAG_CALL_FUNCTION_MANY);
  78}
  79
  80/* Hook for the generic smp_call_function_single() routine. */
  81static inline void arch_send_call_function_single_ipi(int cpu)
  82{
  83        send_IPI_single(cpu, MSG_TAG_CALL_FUNCTION_SINGLE);
  84}
  85
  86/* Print out the boot string describing which cpus were disabled. */
  87void print_disabled_cpus(void);
  88
  89#else /* !CONFIG_SMP */
  90
  91#define smp_master_cpu          0
  92#define smp_height              1
  93#define smp_width               1
  94#define cpu_x(cpu)              0
  95#define cpu_y(cpu)              0
  96#define xy_to_cpu(x, y)         0
  97
  98#endif /* !CONFIG_SMP */
  99
 100
 101/* Which cpus may be used as the lotar in a page table entry. */
 102extern struct cpumask cpu_lotar_map;
 103#define cpu_is_valid_lotar(cpu) cpumask_test_cpu((cpu), &cpu_lotar_map)
 104
 105/* Which processors are used for hash-for-home mapping */
 106extern struct cpumask hash_for_home_map;
 107
 108/* Which cpus can have their cache flushed by hv_flush_remote(). */
 109extern struct cpumask cpu_cacheable_map;
 110#define cpu_cacheable(cpu) cpumask_test_cpu((cpu), &cpu_cacheable_map)
 111
 112/* Convert an HV_LOTAR value into a cpu. */
 113static inline int hv_lotar_to_cpu(HV_LOTAR lotar)
 114{
 115        return HV_LOTAR_X(lotar) + (HV_LOTAR_Y(lotar) * smp_width);
 116}
 117
 118/*
 119 * Extension of <linux/cpumask.h> functionality when you just want
 120 * to express a mask or suppression or inclusion region without
 121 * being too concerned about exactly which cpus are valid in that region.
 122 */
 123int bitmap_parselist_crop(const char *bp, unsigned long *maskp, int nmaskbits);
 124
 125#define cpulist_parse_crop(buf, dst) \
 126                        __cpulist_parse_crop((buf), (dst), NR_CPUS)
 127static inline int __cpulist_parse_crop(const char *buf, struct cpumask *dstp,
 128                                        int nbits)
 129{
 130        return bitmap_parselist_crop(buf, cpumask_bits(dstp), nbits);
 131}
 132
 133/* Initialize the IPI subsystem. */
 134void ipi_init(void);
 135
 136/* Function for start-cpu message to cause us to jump to. */
 137extern unsigned long start_cpu_function_addr;
 138
 139#endif /* _ASM_TILE_SMP_H */
 140