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