1 | #include <machine/rtems-bsd-kernel-space.h> |
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2 | |
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3 | /*- |
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4 | * Copyright (c) 1997, Stefan Esser <se@freebsd.org> |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions |
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9 | * are met: |
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10 | * 1. Redistributions of source code must retain the above copyright |
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11 | * notice unmodified, this list of conditions, and the following |
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12 | * disclaimer. |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | #include <sys/cdefs.h> |
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30 | __FBSDID("$FreeBSD$"); |
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31 | |
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32 | #include <rtems/bsd/local/opt_ddb.h> |
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33 | |
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34 | #include <rtems/bsd/sys/param.h> |
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35 | #include <sys/bus.h> |
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36 | #include <sys/conf.h> |
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37 | #include <rtems/bsd/sys/cpuset.h> |
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38 | #include <sys/rtprio.h> |
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39 | #include <sys/systm.h> |
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40 | #include <sys/interrupt.h> |
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41 | #include <sys/kernel.h> |
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42 | #include <sys/kthread.h> |
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43 | #include <sys/ktr.h> |
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44 | #include <sys/limits.h> |
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45 | #include <rtems/bsd/sys/lock.h> |
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46 | #include <sys/malloc.h> |
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47 | #include <sys/mutex.h> |
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48 | #include <sys/priv.h> |
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49 | #include <sys/proc.h> |
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50 | #include <sys/random.h> |
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51 | #include <sys/resourcevar.h> |
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52 | #include <sys/sched.h> |
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53 | #include <sys/smp.h> |
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54 | #include <sys/sysctl.h> |
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55 | #include <sys/syslog.h> |
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56 | #include <rtems/bsd/sys/unistd.h> |
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57 | #include <sys/vmmeter.h> |
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58 | #include <machine/atomic.h> |
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59 | #include <machine/cpu.h> |
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60 | #ifndef __rtems__ |
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61 | #include <machine/md_var.h> |
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62 | #else /* __rtems__ */ |
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63 | #ifdef INTR_FILTER |
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64 | #error INTR_FILTER is currently not suppported with RTEMS |
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65 | #endif |
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66 | #include <machine/rtems-bsd-thread.h> |
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67 | #define RTEMSBSD_SWI_WAKEUP_EVENT RTEMS_EVENT_31 |
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68 | #endif /* __rtems__ */ |
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69 | #include <machine/stdarg.h> |
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70 | #ifdef DDB |
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71 | #include <ddb/ddb.h> |
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72 | #include <ddb/db_sym.h> |
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73 | #endif |
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74 | |
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75 | /* |
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76 | * Describe an interrupt thread. There is one of these per interrupt event. |
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77 | */ |
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78 | struct intr_thread { |
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79 | struct intr_event *it_event; |
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80 | struct thread *it_thread; /* Kernel thread. */ |
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81 | int it_flags; /* (j) IT_* flags. */ |
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82 | int it_need; /* Needs service. */ |
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83 | }; |
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84 | |
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85 | /* Interrupt thread flags kept in it_flags */ |
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86 | #define IT_DEAD 0x000001 /* Thread is waiting to exit. */ |
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87 | #define IT_WAIT 0x000002 /* Thread is waiting for completion. */ |
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88 | |
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89 | struct intr_entropy { |
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90 | struct thread *td; |
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91 | uintptr_t event; |
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92 | }; |
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93 | |
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94 | struct intr_event *clk_intr_event; |
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95 | #ifndef __rtems__ |
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96 | struct intr_event *tty_intr_event; |
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97 | void *vm_ih; |
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98 | #endif /* __rtems__ */ |
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99 | struct proc *intrproc; |
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100 | |
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101 | static MALLOC_DEFINE(M_ITHREAD, "ithread", "Interrupt Threads"); |
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102 | |
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103 | static int intr_storm_threshold = 1000; |
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104 | #ifndef __rtems__ |
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105 | TUNABLE_INT("hw.intr_storm_threshold", &intr_storm_threshold); |
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106 | SYSCTL_INT(_hw, OID_AUTO, intr_storm_threshold, CTLFLAG_RW, |
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107 | &intr_storm_threshold, 0, |
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108 | "Number of consecutive interrupts before storm protection is enabled"); |
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109 | #endif /* __rtems__ */ |
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110 | static TAILQ_HEAD(, intr_event) event_list = |
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111 | TAILQ_HEAD_INITIALIZER(event_list); |
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112 | static struct mtx event_lock; |
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113 | MTX_SYSINIT(intr_event_list, &event_lock, "intr event list", MTX_DEF); |
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114 | |
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115 | static void intr_event_update(struct intr_event *ie); |
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116 | #ifdef INTR_FILTER |
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117 | static int intr_event_schedule_thread(struct intr_event *ie, |
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118 | struct intr_thread *ithd); |
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119 | static int intr_filter_loop(struct intr_event *ie, |
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120 | struct trapframe *frame, struct intr_thread **ithd); |
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121 | static struct intr_thread *ithread_create(const char *name, |
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122 | struct intr_handler *ih); |
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123 | #else |
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124 | static int intr_event_schedule_thread(struct intr_event *ie); |
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125 | static struct intr_thread *ithread_create(const char *name); |
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126 | #endif |
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127 | #ifndef __rtems__ |
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128 | static void ithread_destroy(struct intr_thread *ithread); |
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129 | #endif /* __rtems__ */ |
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130 | static void ithread_execute_handlers(struct proc *p, |
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131 | struct intr_event *ie); |
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132 | #ifdef INTR_FILTER |
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133 | static void priv_ithread_execute_handler(struct proc *p, |
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134 | struct intr_handler *ih); |
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135 | #endif |
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136 | static void ithread_loop(void *); |
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137 | static void ithread_update(struct intr_thread *ithd); |
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138 | #ifndef __rtems__ |
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139 | static void start_softintr(void *); |
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140 | |
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141 | /* Map an interrupt type to an ithread priority. */ |
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142 | u_char |
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143 | intr_priority(enum intr_type flags) |
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144 | { |
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145 | u_char pri; |
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146 | |
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147 | flags &= (INTR_TYPE_TTY | INTR_TYPE_BIO | INTR_TYPE_NET | |
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148 | INTR_TYPE_CAM | INTR_TYPE_MISC | INTR_TYPE_CLK | INTR_TYPE_AV); |
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149 | switch (flags) { |
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150 | case INTR_TYPE_TTY: |
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151 | pri = PI_TTY; |
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152 | break; |
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153 | case INTR_TYPE_BIO: |
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154 | pri = PI_DISK; |
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155 | break; |
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156 | case INTR_TYPE_NET: |
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157 | pri = PI_NET; |
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158 | break; |
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159 | case INTR_TYPE_CAM: |
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160 | pri = PI_DISK; |
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161 | break; |
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162 | case INTR_TYPE_AV: |
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163 | pri = PI_AV; |
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164 | break; |
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165 | case INTR_TYPE_CLK: |
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166 | pri = PI_REALTIME; |
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167 | break; |
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168 | case INTR_TYPE_MISC: |
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169 | pri = PI_DULL; /* don't care */ |
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170 | break; |
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171 | default: |
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172 | /* We didn't specify an interrupt level. */ |
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173 | panic("intr_priority: no interrupt type in flags"); |
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174 | } |
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175 | |
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176 | return pri; |
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177 | } |
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178 | |
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179 | #endif /* __rtems__ */ |
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180 | /* |
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181 | * Update an ithread based on the associated intr_event. |
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182 | */ |
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183 | static void |
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184 | ithread_update(struct intr_thread *ithd) |
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185 | { |
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186 | struct intr_event *ie; |
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187 | struct thread *td; |
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188 | u_char pri; |
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189 | |
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190 | ie = ithd->it_event; |
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191 | td = ithd->it_thread; |
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192 | |
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193 | /* Determine the overall priority of this event. */ |
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194 | if (TAILQ_EMPTY(&ie->ie_handlers)) |
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195 | pri = PRI_MAX_ITHD; |
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196 | else |
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197 | pri = TAILQ_FIRST(&ie->ie_handlers)->ih_pri; |
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198 | |
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199 | /* Update name and priority. */ |
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200 | strlcpy(td->td_name, ie->ie_fullname, sizeof(td->td_name)); |
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201 | #ifdef KTR |
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202 | sched_clear_tdname(td); |
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203 | #endif |
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204 | thread_lock(td); |
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205 | #ifndef __rtems__ |
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206 | sched_prio(td, pri); |
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207 | #else /* __rtems__ */ |
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208 | #warning TODO: set thread priority |
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209 | #endif /* __rtems__ */ |
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210 | thread_unlock(td); |
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211 | } |
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212 | |
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213 | /* |
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214 | * Regenerate the full name of an interrupt event and update its priority. |
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215 | */ |
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216 | static void |
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217 | intr_event_update(struct intr_event *ie) |
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218 | { |
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219 | struct intr_handler *ih; |
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220 | char *last; |
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221 | int missed, space; |
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222 | |
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223 | /* Start off with no entropy and just the name of the event. */ |
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224 | mtx_assert(&ie->ie_lock, MA_OWNED); |
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225 | strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname)); |
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226 | ie->ie_flags &= ~IE_ENTROPY; |
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227 | missed = 0; |
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228 | space = 1; |
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229 | |
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230 | /* Run through all the handlers updating values. */ |
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231 | TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { |
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232 | if (strlen(ie->ie_fullname) + strlen(ih->ih_name) + 1 < |
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233 | sizeof(ie->ie_fullname)) { |
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234 | strcat(ie->ie_fullname, " "); |
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235 | strcat(ie->ie_fullname, ih->ih_name); |
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236 | space = 0; |
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237 | } else |
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238 | missed++; |
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239 | if (ih->ih_flags & IH_ENTROPY) |
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240 | ie->ie_flags |= IE_ENTROPY; |
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241 | } |
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242 | |
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243 | /* |
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244 | * If the handler names were too long, add +'s to indicate missing |
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245 | * names. If we run out of room and still have +'s to add, change |
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246 | * the last character from a + to a *. |
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247 | */ |
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248 | last = &ie->ie_fullname[sizeof(ie->ie_fullname) - 2]; |
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249 | while (missed-- > 0) { |
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250 | if (strlen(ie->ie_fullname) + 1 == sizeof(ie->ie_fullname)) { |
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251 | if (*last == '+') { |
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252 | *last = '*'; |
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253 | break; |
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254 | } else |
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255 | *last = '+'; |
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256 | } else if (space) { |
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257 | strcat(ie->ie_fullname, " +"); |
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258 | space = 0; |
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259 | } else |
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260 | strcat(ie->ie_fullname, "+"); |
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261 | } |
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262 | |
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263 | /* |
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264 | * If this event has an ithread, update it's priority and |
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265 | * name. |
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266 | */ |
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267 | if (ie->ie_thread != NULL) |
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268 | ithread_update(ie->ie_thread); |
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269 | CTR2(KTR_INTR, "%s: updated %s", __func__, ie->ie_fullname); |
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270 | } |
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271 | |
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272 | int |
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273 | intr_event_create(struct intr_event **event, void *source, int flags, int irq, |
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274 | void (*pre_ithread)(void *), void (*post_ithread)(void *), |
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275 | void (*post_filter)(void *), int (*assign_cpu)(void *, u_char), |
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276 | const char *fmt, ...) |
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277 | { |
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278 | struct intr_event *ie; |
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279 | va_list ap; |
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280 | |
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281 | /* The only valid flag during creation is IE_SOFT. */ |
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282 | if ((flags & ~IE_SOFT) != 0) |
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283 | return (EINVAL); |
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284 | ie = malloc(sizeof(struct intr_event), M_ITHREAD, M_WAITOK | M_ZERO); |
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285 | ie->ie_source = source; |
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286 | ie->ie_pre_ithread = pre_ithread; |
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287 | ie->ie_post_ithread = post_ithread; |
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288 | ie->ie_post_filter = post_filter; |
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289 | ie->ie_assign_cpu = assign_cpu; |
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290 | ie->ie_flags = flags; |
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291 | ie->ie_irq = irq; |
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292 | ie->ie_cpu = NOCPU; |
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293 | TAILQ_INIT(&ie->ie_handlers); |
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294 | mtx_init(&ie->ie_lock, "intr event", NULL, MTX_DEF); |
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295 | |
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296 | va_start(ap, fmt); |
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297 | vsnprintf(ie->ie_name, sizeof(ie->ie_name), fmt, ap); |
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298 | va_end(ap); |
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299 | strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname)); |
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300 | mtx_lock(&event_lock); |
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301 | TAILQ_INSERT_TAIL(&event_list, ie, ie_list); |
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302 | mtx_unlock(&event_lock); |
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303 | if (event != NULL) |
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304 | *event = ie; |
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305 | CTR2(KTR_INTR, "%s: created %s", __func__, ie->ie_name); |
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306 | return (0); |
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307 | } |
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308 | |
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309 | #ifndef __rtems__ |
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310 | /* |
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311 | * Bind an interrupt event to the specified CPU. Note that not all |
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312 | * platforms support binding an interrupt to a CPU. For those |
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313 | * platforms this request will fail. For supported platforms, any |
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314 | * associated ithreads as well as the primary interrupt context will |
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315 | * be bound to the specificed CPU. Using a cpu id of NOCPU unbinds |
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316 | * the interrupt event. |
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317 | */ |
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318 | int |
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319 | intr_event_bind(struct intr_event *ie, u_char cpu) |
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320 | { |
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321 | cpuset_t mask; |
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322 | lwpid_t id; |
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323 | int error; |
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324 | |
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325 | /* Need a CPU to bind to. */ |
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326 | if (cpu != NOCPU && CPU_ABSENT(cpu)) |
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327 | return (EINVAL); |
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328 | |
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329 | if (ie->ie_assign_cpu == NULL) |
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330 | return (EOPNOTSUPP); |
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331 | |
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332 | error = priv_check(curthread, PRIV_SCHED_CPUSET_INTR); |
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333 | if (error) |
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334 | return (error); |
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335 | |
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336 | /* |
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337 | * If we have any ithreads try to set their mask first to verify |
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338 | * permissions, etc. |
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339 | */ |
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340 | mtx_lock(&ie->ie_lock); |
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341 | if (ie->ie_thread != NULL) { |
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342 | CPU_ZERO(&mask); |
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343 | if (cpu == NOCPU) |
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344 | CPU_COPY(cpuset_root, &mask); |
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345 | else |
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346 | CPU_SET(cpu, &mask); |
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347 | id = ie->ie_thread->it_thread->td_tid; |
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348 | mtx_unlock(&ie->ie_lock); |
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349 | error = cpuset_setthread(id, &mask); |
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350 | if (error) |
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351 | return (error); |
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352 | } else |
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353 | mtx_unlock(&ie->ie_lock); |
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354 | error = ie->ie_assign_cpu(ie->ie_source, cpu); |
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355 | if (error) { |
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356 | mtx_lock(&ie->ie_lock); |
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357 | if (ie->ie_thread != NULL) { |
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358 | CPU_ZERO(&mask); |
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359 | if (ie->ie_cpu == NOCPU) |
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360 | CPU_COPY(cpuset_root, &mask); |
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361 | else |
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362 | CPU_SET(cpu, &mask); |
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363 | id = ie->ie_thread->it_thread->td_tid; |
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364 | mtx_unlock(&ie->ie_lock); |
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365 | (void)cpuset_setthread(id, &mask); |
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366 | } else |
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367 | mtx_unlock(&ie->ie_lock); |
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368 | return (error); |
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369 | } |
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370 | |
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371 | mtx_lock(&ie->ie_lock); |
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372 | ie->ie_cpu = cpu; |
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373 | mtx_unlock(&ie->ie_lock); |
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374 | |
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375 | return (error); |
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376 | } |
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377 | |
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378 | static struct intr_event * |
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379 | intr_lookup(int irq) |
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380 | { |
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381 | struct intr_event *ie; |
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382 | |
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383 | mtx_lock(&event_lock); |
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384 | TAILQ_FOREACH(ie, &event_list, ie_list) |
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385 | if (ie->ie_irq == irq && |
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386 | (ie->ie_flags & IE_SOFT) == 0 && |
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387 | TAILQ_FIRST(&ie->ie_handlers) != NULL) |
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388 | break; |
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389 | mtx_unlock(&event_lock); |
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390 | return (ie); |
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391 | } |
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392 | |
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393 | int |
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394 | intr_setaffinity(int irq, void *m) |
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395 | { |
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396 | struct intr_event *ie; |
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397 | cpuset_t *mask; |
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398 | u_char cpu; |
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399 | int n; |
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400 | |
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401 | mask = m; |
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402 | cpu = NOCPU; |
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403 | /* |
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404 | * If we're setting all cpus we can unbind. Otherwise make sure |
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405 | * only one cpu is in the set. |
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406 | */ |
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407 | if (CPU_CMP(cpuset_root, mask)) { |
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408 | for (n = 0; n < CPU_SETSIZE; n++) { |
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409 | if (!CPU_ISSET(n, mask)) |
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410 | continue; |
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411 | if (cpu != NOCPU) |
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412 | return (EINVAL); |
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413 | cpu = (u_char)n; |
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414 | } |
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415 | } |
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416 | ie = intr_lookup(irq); |
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417 | if (ie == NULL) |
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418 | return (ESRCH); |
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419 | return (intr_event_bind(ie, cpu)); |
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420 | } |
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421 | |
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422 | int |
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423 | intr_getaffinity(int irq, void *m) |
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424 | { |
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425 | struct intr_event *ie; |
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426 | cpuset_t *mask; |
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427 | |
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428 | mask = m; |
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429 | ie = intr_lookup(irq); |
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430 | if (ie == NULL) |
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431 | return (ESRCH); |
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432 | CPU_ZERO(mask); |
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433 | mtx_lock(&ie->ie_lock); |
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434 | if (ie->ie_cpu == NOCPU) |
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435 | CPU_COPY(cpuset_root, mask); |
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436 | else |
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437 | CPU_SET(ie->ie_cpu, mask); |
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438 | mtx_unlock(&ie->ie_lock); |
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439 | return (0); |
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440 | } |
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441 | |
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442 | int |
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443 | intr_event_destroy(struct intr_event *ie) |
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444 | { |
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445 | |
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446 | mtx_lock(&event_lock); |
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447 | mtx_lock(&ie->ie_lock); |
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448 | if (!TAILQ_EMPTY(&ie->ie_handlers)) { |
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449 | mtx_unlock(&ie->ie_lock); |
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450 | mtx_unlock(&event_lock); |
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451 | return (EBUSY); |
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452 | } |
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453 | TAILQ_REMOVE(&event_list, ie, ie_list); |
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454 | #ifndef notyet |
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455 | if (ie->ie_thread != NULL) { |
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456 | ithread_destroy(ie->ie_thread); |
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457 | ie->ie_thread = NULL; |
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458 | } |
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459 | #endif |
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460 | mtx_unlock(&ie->ie_lock); |
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461 | mtx_unlock(&event_lock); |
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462 | mtx_destroy(&ie->ie_lock); |
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463 | free(ie, M_ITHREAD); |
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464 | return (0); |
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465 | } |
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466 | |
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467 | #endif /* __rtems__ */ |
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468 | #ifndef INTR_FILTER |
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469 | static struct intr_thread * |
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470 | ithread_create(const char *name) |
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471 | { |
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472 | struct intr_thread *ithd; |
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473 | struct thread *td; |
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474 | int error; |
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475 | |
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476 | ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO); |
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477 | |
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478 | error = kproc_kthread_add(ithread_loop, ithd, &intrproc, |
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479 | &td, RFSTOPPED | RFHIGHPID, |
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480 | 0, "intr", "%s", name); |
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481 | if (error) |
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482 | panic("kproc_create() failed with %d", error); |
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483 | thread_lock(td); |
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484 | #ifndef __rtems__ |
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485 | sched_class(td, PRI_ITHD); |
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486 | TD_SET_IWAIT(td); |
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487 | #endif /* __rtems__ */ |
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488 | thread_unlock(td); |
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489 | #ifndef __rtems__ |
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490 | td->td_pflags |= TDP_ITHREAD; |
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491 | #endif /* __rtems__ */ |
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492 | ithd->it_thread = td; |
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493 | CTR2(KTR_INTR, "%s: created %s", __func__, name); |
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494 | return (ithd); |
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495 | } |
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496 | #else |
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497 | #ifndef __rtems__ |
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498 | static struct intr_thread * |
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499 | ithread_create(const char *name, struct intr_handler *ih) |
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500 | { |
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501 | struct intr_thread *ithd; |
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502 | struct thread *td; |
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503 | int error; |
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504 | |
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505 | ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO); |
---|
506 | |
---|
507 | error = kproc_kthread_add(ithread_loop, ih, &intrproc, |
---|
508 | &td, RFSTOPPED | RFHIGHPID, |
---|
509 | 0, "intr", "%s", name); |
---|
510 | if (error) |
---|
511 | panic("kproc_create() failed with %d", error); |
---|
512 | thread_lock(td); |
---|
513 | sched_class(td, PRI_ITHD); |
---|
514 | TD_SET_IWAIT(td); |
---|
515 | thread_unlock(td); |
---|
516 | td->td_pflags |= TDP_ITHREAD; |
---|
517 | ithd->it_thread = td; |
---|
518 | CTR2(KTR_INTR, "%s: created %s", __func__, name); |
---|
519 | return (ithd); |
---|
520 | } |
---|
521 | #endif /* __rtems__ */ |
---|
522 | #endif |
---|
523 | #ifndef __rtems__ |
---|
524 | |
---|
525 | static void |
---|
526 | ithread_destroy(struct intr_thread *ithread) |
---|
527 | { |
---|
528 | struct thread *td; |
---|
529 | |
---|
530 | CTR2(KTR_INTR, "%s: killing %s", __func__, ithread->it_event->ie_name); |
---|
531 | td = ithread->it_thread; |
---|
532 | thread_lock(td); |
---|
533 | ithread->it_flags |= IT_DEAD; |
---|
534 | if (TD_AWAITING_INTR(td)) { |
---|
535 | TD_CLR_IWAIT(td); |
---|
536 | sched_add(td, SRQ_INTR); |
---|
537 | } |
---|
538 | thread_unlock(td); |
---|
539 | } |
---|
540 | |
---|
541 | #endif /* __rtems__ */ |
---|
542 | #ifndef INTR_FILTER |
---|
543 | int |
---|
544 | intr_event_add_handler(struct intr_event *ie, const char *name, |
---|
545 | driver_filter_t filter, driver_intr_t handler, void *arg, u_char pri, |
---|
546 | enum intr_type flags, void **cookiep) |
---|
547 | { |
---|
548 | struct intr_handler *ih, *temp_ih; |
---|
549 | struct intr_thread *it; |
---|
550 | |
---|
551 | if (ie == NULL || name == NULL || (handler == NULL && filter == NULL)) |
---|
552 | return (EINVAL); |
---|
553 | |
---|
554 | /* Allocate and populate an interrupt handler structure. */ |
---|
555 | ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO); |
---|
556 | ih->ih_filter = filter; |
---|
557 | ih->ih_handler = handler; |
---|
558 | ih->ih_argument = arg; |
---|
559 | strlcpy(ih->ih_name, name, sizeof(ih->ih_name)); |
---|
560 | ih->ih_event = ie; |
---|
561 | ih->ih_pri = pri; |
---|
562 | if (flags & INTR_EXCL) |
---|
563 | ih->ih_flags = IH_EXCLUSIVE; |
---|
564 | if (flags & INTR_MPSAFE) |
---|
565 | ih->ih_flags |= IH_MPSAFE; |
---|
566 | if (flags & INTR_ENTROPY) |
---|
567 | ih->ih_flags |= IH_ENTROPY; |
---|
568 | |
---|
569 | /* We can only have one exclusive handler in a event. */ |
---|
570 | mtx_lock(&ie->ie_lock); |
---|
571 | if (!TAILQ_EMPTY(&ie->ie_handlers)) { |
---|
572 | if ((flags & INTR_EXCL) || |
---|
573 | (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) { |
---|
574 | mtx_unlock(&ie->ie_lock); |
---|
575 | free(ih, M_ITHREAD); |
---|
576 | return (EINVAL); |
---|
577 | } |
---|
578 | } |
---|
579 | |
---|
580 | /* Create a thread if we need one. */ |
---|
581 | while (ie->ie_thread == NULL && handler != NULL) { |
---|
582 | if (ie->ie_flags & IE_ADDING_THREAD) |
---|
583 | msleep(ie, &ie->ie_lock, 0, "ithread", 0); |
---|
584 | else { |
---|
585 | ie->ie_flags |= IE_ADDING_THREAD; |
---|
586 | mtx_unlock(&ie->ie_lock); |
---|
587 | it = ithread_create("intr: newborn"); |
---|
588 | mtx_lock(&ie->ie_lock); |
---|
589 | ie->ie_flags &= ~IE_ADDING_THREAD; |
---|
590 | ie->ie_thread = it; |
---|
591 | it->it_event = ie; |
---|
592 | ithread_update(it); |
---|
593 | wakeup(ie); |
---|
594 | } |
---|
595 | } |
---|
596 | |
---|
597 | /* Add the new handler to the event in priority order. */ |
---|
598 | TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) { |
---|
599 | if (temp_ih->ih_pri > ih->ih_pri) |
---|
600 | break; |
---|
601 | } |
---|
602 | if (temp_ih == NULL) |
---|
603 | TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next); |
---|
604 | else |
---|
605 | TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next); |
---|
606 | intr_event_update(ie); |
---|
607 | |
---|
608 | CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name, |
---|
609 | ie->ie_name); |
---|
610 | mtx_unlock(&ie->ie_lock); |
---|
611 | |
---|
612 | if (cookiep != NULL) |
---|
613 | *cookiep = ih; |
---|
614 | return (0); |
---|
615 | } |
---|
616 | #else |
---|
617 | #ifndef __rtems__ |
---|
618 | int |
---|
619 | intr_event_add_handler(struct intr_event *ie, const char *name, |
---|
620 | driver_filter_t filter, driver_intr_t handler, void *arg, u_char pri, |
---|
621 | enum intr_type flags, void **cookiep) |
---|
622 | { |
---|
623 | struct intr_handler *ih, *temp_ih; |
---|
624 | struct intr_thread *it; |
---|
625 | |
---|
626 | if (ie == NULL || name == NULL || (handler == NULL && filter == NULL)) |
---|
627 | return (EINVAL); |
---|
628 | |
---|
629 | /* Allocate and populate an interrupt handler structure. */ |
---|
630 | ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO); |
---|
631 | ih->ih_filter = filter; |
---|
632 | ih->ih_handler = handler; |
---|
633 | ih->ih_argument = arg; |
---|
634 | strlcpy(ih->ih_name, name, sizeof(ih->ih_name)); |
---|
635 | ih->ih_event = ie; |
---|
636 | ih->ih_pri = pri; |
---|
637 | if (flags & INTR_EXCL) |
---|
638 | ih->ih_flags = IH_EXCLUSIVE; |
---|
639 | if (flags & INTR_MPSAFE) |
---|
640 | ih->ih_flags |= IH_MPSAFE; |
---|
641 | if (flags & INTR_ENTROPY) |
---|
642 | ih->ih_flags |= IH_ENTROPY; |
---|
643 | |
---|
644 | /* We can only have one exclusive handler in a event. */ |
---|
645 | mtx_lock(&ie->ie_lock); |
---|
646 | if (!TAILQ_EMPTY(&ie->ie_handlers)) { |
---|
647 | if ((flags & INTR_EXCL) || |
---|
648 | (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) { |
---|
649 | mtx_unlock(&ie->ie_lock); |
---|
650 | free(ih, M_ITHREAD); |
---|
651 | return (EINVAL); |
---|
652 | } |
---|
653 | } |
---|
654 | |
---|
655 | /* For filtered handlers, create a private ithread to run on. */ |
---|
656 | if (filter != NULL && handler != NULL) { |
---|
657 | mtx_unlock(&ie->ie_lock); |
---|
658 | it = ithread_create("intr: newborn", ih); |
---|
659 | mtx_lock(&ie->ie_lock); |
---|
660 | it->it_event = ie; |
---|
661 | ih->ih_thread = it; |
---|
662 | ithread_update(it); // XXX - do we really need this?!?!? |
---|
663 | } else { /* Create the global per-event thread if we need one. */ |
---|
664 | while (ie->ie_thread == NULL && handler != NULL) { |
---|
665 | if (ie->ie_flags & IE_ADDING_THREAD) |
---|
666 | msleep(ie, &ie->ie_lock, 0, "ithread", 0); |
---|
667 | else { |
---|
668 | ie->ie_flags |= IE_ADDING_THREAD; |
---|
669 | mtx_unlock(&ie->ie_lock); |
---|
670 | it = ithread_create("intr: newborn", ih); |
---|
671 | mtx_lock(&ie->ie_lock); |
---|
672 | ie->ie_flags &= ~IE_ADDING_THREAD; |
---|
673 | ie->ie_thread = it; |
---|
674 | it->it_event = ie; |
---|
675 | ithread_update(it); |
---|
676 | wakeup(ie); |
---|
677 | } |
---|
678 | } |
---|
679 | } |
---|
680 | |
---|
681 | /* Add the new handler to the event in priority order. */ |
---|
682 | TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) { |
---|
683 | if (temp_ih->ih_pri > ih->ih_pri) |
---|
684 | break; |
---|
685 | } |
---|
686 | if (temp_ih == NULL) |
---|
687 | TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next); |
---|
688 | else |
---|
689 | TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next); |
---|
690 | intr_event_update(ie); |
---|
691 | |
---|
692 | CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name, |
---|
693 | ie->ie_name); |
---|
694 | mtx_unlock(&ie->ie_lock); |
---|
695 | |
---|
696 | if (cookiep != NULL) |
---|
697 | *cookiep = ih; |
---|
698 | return (0); |
---|
699 | } |
---|
700 | #endif /* __rtems__ */ |
---|
701 | #endif |
---|
702 | |
---|
703 | #ifndef __rtems__ |
---|
704 | /* |
---|
705 | * Append a description preceded by a ':' to the name of the specified |
---|
706 | * interrupt handler. |
---|
707 | */ |
---|
708 | int |
---|
709 | intr_event_describe_handler(struct intr_event *ie, void *cookie, |
---|
710 | const char *descr) |
---|
711 | { |
---|
712 | struct intr_handler *ih; |
---|
713 | size_t space; |
---|
714 | char *start; |
---|
715 | |
---|
716 | mtx_lock(&ie->ie_lock); |
---|
717 | #ifdef INVARIANTS |
---|
718 | TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { |
---|
719 | if (ih == cookie) |
---|
720 | break; |
---|
721 | } |
---|
722 | if (ih == NULL) { |
---|
723 | mtx_unlock(&ie->ie_lock); |
---|
724 | panic("handler %p not found in interrupt event %p", cookie, ie); |
---|
725 | } |
---|
726 | #endif |
---|
727 | ih = cookie; |
---|
728 | |
---|
729 | /* |
---|
730 | * Look for an existing description by checking for an |
---|
731 | * existing ":". This assumes device names do not include |
---|
732 | * colons. If one is found, prepare to insert the new |
---|
733 | * description at that point. If one is not found, find the |
---|
734 | * end of the name to use as the insertion point. |
---|
735 | */ |
---|
736 | start = index(ih->ih_name, ':'); |
---|
737 | if (start == NULL) |
---|
738 | start = index(ih->ih_name, 0); |
---|
739 | |
---|
740 | /* |
---|
741 | * See if there is enough remaining room in the string for the |
---|
742 | * description + ":". The "- 1" leaves room for the trailing |
---|
743 | * '\0'. The "+ 1" accounts for the colon. |
---|
744 | */ |
---|
745 | space = sizeof(ih->ih_name) - (start - ih->ih_name) - 1; |
---|
746 | if (strlen(descr) + 1 > space) { |
---|
747 | mtx_unlock(&ie->ie_lock); |
---|
748 | return (ENOSPC); |
---|
749 | } |
---|
750 | |
---|
751 | /* Append a colon followed by the description. */ |
---|
752 | *start = ':'; |
---|
753 | strcpy(start + 1, descr); |
---|
754 | intr_event_update(ie); |
---|
755 | mtx_unlock(&ie->ie_lock); |
---|
756 | return (0); |
---|
757 | } |
---|
758 | |
---|
759 | /* |
---|
760 | * Return the ie_source field from the intr_event an intr_handler is |
---|
761 | * associated with. |
---|
762 | */ |
---|
763 | void * |
---|
764 | intr_handler_source(void *cookie) |
---|
765 | { |
---|
766 | struct intr_handler *ih; |
---|
767 | struct intr_event *ie; |
---|
768 | |
---|
769 | ih = (struct intr_handler *)cookie; |
---|
770 | if (ih == NULL) |
---|
771 | return (NULL); |
---|
772 | ie = ih->ih_event; |
---|
773 | KASSERT(ie != NULL, |
---|
774 | ("interrupt handler \"%s\" has a NULL interrupt event", |
---|
775 | ih->ih_name)); |
---|
776 | return (ie->ie_source); |
---|
777 | } |
---|
778 | |
---|
779 | /* |
---|
780 | * Sleep until an ithread finishes executing an interrupt handler. |
---|
781 | * |
---|
782 | * XXX Doesn't currently handle interrupt filters or fast interrupt |
---|
783 | * handlers. This is intended for compatibility with linux drivers |
---|
784 | * only. Do not use in BSD code. |
---|
785 | */ |
---|
786 | void |
---|
787 | _intr_drain(int irq) |
---|
788 | { |
---|
789 | struct intr_event *ie; |
---|
790 | struct intr_thread *ithd; |
---|
791 | struct thread *td; |
---|
792 | |
---|
793 | ie = intr_lookup(irq); |
---|
794 | if (ie == NULL) |
---|
795 | return; |
---|
796 | if (ie->ie_thread == NULL) |
---|
797 | return; |
---|
798 | ithd = ie->ie_thread; |
---|
799 | td = ithd->it_thread; |
---|
800 | /* |
---|
801 | * We set the flag and wait for it to be cleared to avoid |
---|
802 | * long delays with potentially busy interrupt handlers |
---|
803 | * were we to only sample TD_AWAITING_INTR() every tick. |
---|
804 | */ |
---|
805 | thread_lock(td); |
---|
806 | if (!TD_AWAITING_INTR(td)) { |
---|
807 | ithd->it_flags |= IT_WAIT; |
---|
808 | while (ithd->it_flags & IT_WAIT) { |
---|
809 | thread_unlock(td); |
---|
810 | pause("idrain", 1); |
---|
811 | thread_lock(td); |
---|
812 | } |
---|
813 | } |
---|
814 | thread_unlock(td); |
---|
815 | return; |
---|
816 | } |
---|
817 | #endif /* __rtems__ */ |
---|
818 | |
---|
819 | |
---|
820 | #ifndef INTR_FILTER |
---|
821 | #ifndef __rtems__ |
---|
822 | int |
---|
823 | intr_event_remove_handler(void *cookie) |
---|
824 | { |
---|
825 | struct intr_handler *handler = (struct intr_handler *)cookie; |
---|
826 | struct intr_event *ie; |
---|
827 | #ifdef INVARIANTS |
---|
828 | struct intr_handler *ih; |
---|
829 | #endif |
---|
830 | #ifdef notyet |
---|
831 | int dead; |
---|
832 | #endif |
---|
833 | |
---|
834 | if (handler == NULL) |
---|
835 | return (EINVAL); |
---|
836 | ie = handler->ih_event; |
---|
837 | KASSERT(ie != NULL, |
---|
838 | ("interrupt handler \"%s\" has a NULL interrupt event", |
---|
839 | handler->ih_name)); |
---|
840 | mtx_lock(&ie->ie_lock); |
---|
841 | CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name, |
---|
842 | ie->ie_name); |
---|
843 | #ifdef INVARIANTS |
---|
844 | TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) |
---|
845 | if (ih == handler) |
---|
846 | goto ok; |
---|
847 | mtx_unlock(&ie->ie_lock); |
---|
848 | panic("interrupt handler \"%s\" not found in interrupt event \"%s\"", |
---|
849 | ih->ih_name, ie->ie_name); |
---|
850 | ok: |
---|
851 | #endif |
---|
852 | /* |
---|
853 | * If there is no ithread, then just remove the handler and return. |
---|
854 | * XXX: Note that an INTR_FAST handler might be running on another |
---|
855 | * CPU! |
---|
856 | */ |
---|
857 | if (ie->ie_thread == NULL) { |
---|
858 | TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); |
---|
859 | mtx_unlock(&ie->ie_lock); |
---|
860 | free(handler, M_ITHREAD); |
---|
861 | return (0); |
---|
862 | } |
---|
863 | |
---|
864 | /* |
---|
865 | * If the interrupt thread is already running, then just mark this |
---|
866 | * handler as being dead and let the ithread do the actual removal. |
---|
867 | * |
---|
868 | * During a cold boot while cold is set, msleep() does not sleep, |
---|
869 | * so we have to remove the handler here rather than letting the |
---|
870 | * thread do it. |
---|
871 | */ |
---|
872 | thread_lock(ie->ie_thread->it_thread); |
---|
873 | if (!TD_AWAITING_INTR(ie->ie_thread->it_thread) && !cold) { |
---|
874 | handler->ih_flags |= IH_DEAD; |
---|
875 | |
---|
876 | /* |
---|
877 | * Ensure that the thread will process the handler list |
---|
878 | * again and remove this handler if it has already passed |
---|
879 | * it on the list. |
---|
880 | */ |
---|
881 | atomic_store_rel_int(&ie->ie_thread->it_need, 1); |
---|
882 | } else |
---|
883 | TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); |
---|
884 | thread_unlock(ie->ie_thread->it_thread); |
---|
885 | while (handler->ih_flags & IH_DEAD) |
---|
886 | msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0); |
---|
887 | intr_event_update(ie); |
---|
888 | #ifdef notyet |
---|
889 | /* |
---|
890 | * XXX: This could be bad in the case of ppbus(8). Also, I think |
---|
891 | * this could lead to races of stale data when servicing an |
---|
892 | * interrupt. |
---|
893 | */ |
---|
894 | dead = 1; |
---|
895 | TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { |
---|
896 | if (!(ih->ih_flags & IH_FAST)) { |
---|
897 | dead = 0; |
---|
898 | break; |
---|
899 | } |
---|
900 | } |
---|
901 | if (dead) { |
---|
902 | ithread_destroy(ie->ie_thread); |
---|
903 | ie->ie_thread = NULL; |
---|
904 | } |
---|
905 | #endif |
---|
906 | mtx_unlock(&ie->ie_lock); |
---|
907 | free(handler, M_ITHREAD); |
---|
908 | return (0); |
---|
909 | } |
---|
910 | |
---|
911 | #endif /* __rtems__ */ |
---|
912 | static int |
---|
913 | intr_event_schedule_thread(struct intr_event *ie) |
---|
914 | { |
---|
915 | struct intr_entropy entropy; |
---|
916 | struct intr_thread *it; |
---|
917 | struct thread *td; |
---|
918 | struct thread *ctd; |
---|
919 | #ifndef __rtems__ |
---|
920 | struct proc *p; |
---|
921 | #endif /* __rtems__ */ |
---|
922 | |
---|
923 | /* |
---|
924 | * If no ithread or no handlers, then we have a stray interrupt. |
---|
925 | */ |
---|
926 | if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) || |
---|
927 | ie->ie_thread == NULL) |
---|
928 | return (EINVAL); |
---|
929 | |
---|
930 | ctd = curthread; |
---|
931 | it = ie->ie_thread; |
---|
932 | td = it->it_thread; |
---|
933 | #ifndef __rtems__ |
---|
934 | p = td->td_proc; |
---|
935 | #endif /* __rtems__ */ |
---|
936 | |
---|
937 | /* |
---|
938 | * If any of the handlers for this ithread claim to be good |
---|
939 | * sources of entropy, then gather some. |
---|
940 | */ |
---|
941 | if (harvest.interrupt && ie->ie_flags & IE_ENTROPY) { |
---|
942 | CTR3(KTR_INTR, "%s: pid %d (%s) gathering entropy", __func__, |
---|
943 | p->p_pid, td->td_name); |
---|
944 | entropy.event = (uintptr_t)ie; |
---|
945 | entropy.td = ctd; |
---|
946 | random_harvest(&entropy, sizeof(entropy), 2, 0, |
---|
947 | RANDOM_INTERRUPT); |
---|
948 | } |
---|
949 | |
---|
950 | #ifndef __rtems__ |
---|
951 | KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name)); |
---|
952 | #endif /* __rtems__ */ |
---|
953 | |
---|
954 | /* |
---|
955 | * Set it_need to tell the thread to keep running if it is already |
---|
956 | * running. Then, lock the thread and see if we actually need to |
---|
957 | * put it on the runqueue. |
---|
958 | */ |
---|
959 | atomic_store_rel_int(&it->it_need, 1); |
---|
960 | thread_lock(td); |
---|
961 | #ifndef __rtems__ |
---|
962 | if (TD_AWAITING_INTR(td)) { |
---|
963 | CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid, |
---|
964 | td->td_name); |
---|
965 | TD_CLR_IWAIT(td); |
---|
966 | sched_add(td, SRQ_INTR); |
---|
967 | } else { |
---|
968 | CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d", |
---|
969 | __func__, p->p_pid, td->td_name, it->it_need, td->td_state); |
---|
970 | } |
---|
971 | #else /* __rtems__ */ |
---|
972 | /* Send event to wake the thread up. |
---|
973 | * TODO: eventually replace event by a better mechanism |
---|
974 | */ |
---|
975 | rtems_status_code sc = rtems_event_send(rtems_bsd_get_task_id(td), RTEMSBSD_SWI_WAKEUP_EVENT); |
---|
976 | BSD_ASSERT(sc == RTEMS_SUCCESSFUL); |
---|
977 | #endif /* __rtems__ */ |
---|
978 | thread_unlock(td); |
---|
979 | |
---|
980 | return (0); |
---|
981 | } |
---|
982 | #else |
---|
983 | #ifndef __rtems__ |
---|
984 | int |
---|
985 | intr_event_remove_handler(void *cookie) |
---|
986 | { |
---|
987 | struct intr_handler *handler = (struct intr_handler *)cookie; |
---|
988 | struct intr_event *ie; |
---|
989 | struct intr_thread *it; |
---|
990 | #ifdef INVARIANTS |
---|
991 | struct intr_handler *ih; |
---|
992 | #endif |
---|
993 | #ifdef notyet |
---|
994 | int dead; |
---|
995 | #endif |
---|
996 | |
---|
997 | if (handler == NULL) |
---|
998 | return (EINVAL); |
---|
999 | ie = handler->ih_event; |
---|
1000 | KASSERT(ie != NULL, |
---|
1001 | ("interrupt handler \"%s\" has a NULL interrupt event", |
---|
1002 | handler->ih_name)); |
---|
1003 | mtx_lock(&ie->ie_lock); |
---|
1004 | CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name, |
---|
1005 | ie->ie_name); |
---|
1006 | #ifdef INVARIANTS |
---|
1007 | TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) |
---|
1008 | if (ih == handler) |
---|
1009 | goto ok; |
---|
1010 | mtx_unlock(&ie->ie_lock); |
---|
1011 | panic("interrupt handler \"%s\" not found in interrupt event \"%s\"", |
---|
1012 | ih->ih_name, ie->ie_name); |
---|
1013 | ok: |
---|
1014 | #endif |
---|
1015 | /* |
---|
1016 | * If there are no ithreads (per event and per handler), then |
---|
1017 | * just remove the handler and return. |
---|
1018 | * XXX: Note that an INTR_FAST handler might be running on another CPU! |
---|
1019 | */ |
---|
1020 | if (ie->ie_thread == NULL && handler->ih_thread == NULL) { |
---|
1021 | TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); |
---|
1022 | mtx_unlock(&ie->ie_lock); |
---|
1023 | free(handler, M_ITHREAD); |
---|
1024 | return (0); |
---|
1025 | } |
---|
1026 | |
---|
1027 | /* Private or global ithread? */ |
---|
1028 | it = (handler->ih_thread) ? handler->ih_thread : ie->ie_thread; |
---|
1029 | /* |
---|
1030 | * If the interrupt thread is already running, then just mark this |
---|
1031 | * handler as being dead and let the ithread do the actual removal. |
---|
1032 | * |
---|
1033 | * During a cold boot while cold is set, msleep() does not sleep, |
---|
1034 | * so we have to remove the handler here rather than letting the |
---|
1035 | * thread do it. |
---|
1036 | */ |
---|
1037 | thread_lock(it->it_thread); |
---|
1038 | if (!TD_AWAITING_INTR(it->it_thread) && !cold) { |
---|
1039 | handler->ih_flags |= IH_DEAD; |
---|
1040 | |
---|
1041 | /* |
---|
1042 | * Ensure that the thread will process the handler list |
---|
1043 | * again and remove this handler if it has already passed |
---|
1044 | * it on the list. |
---|
1045 | */ |
---|
1046 | atomic_store_rel_int(&it->it_need, 1); |
---|
1047 | } else |
---|
1048 | TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); |
---|
1049 | thread_unlock(it->it_thread); |
---|
1050 | while (handler->ih_flags & IH_DEAD) |
---|
1051 | msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0); |
---|
1052 | /* |
---|
1053 | * At this point, the handler has been disconnected from the event, |
---|
1054 | * so we can kill the private ithread if any. |
---|
1055 | */ |
---|
1056 | if (handler->ih_thread) { |
---|
1057 | ithread_destroy(handler->ih_thread); |
---|
1058 | handler->ih_thread = NULL; |
---|
1059 | } |
---|
1060 | intr_event_update(ie); |
---|
1061 | #ifdef notyet |
---|
1062 | /* |
---|
1063 | * XXX: This could be bad in the case of ppbus(8). Also, I think |
---|
1064 | * this could lead to races of stale data when servicing an |
---|
1065 | * interrupt. |
---|
1066 | */ |
---|
1067 | dead = 1; |
---|
1068 | TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { |
---|
1069 | if (handler != NULL) { |
---|
1070 | dead = 0; |
---|
1071 | break; |
---|
1072 | } |
---|
1073 | } |
---|
1074 | if (dead) { |
---|
1075 | ithread_destroy(ie->ie_thread); |
---|
1076 | ie->ie_thread = NULL; |
---|
1077 | } |
---|
1078 | #endif |
---|
1079 | mtx_unlock(&ie->ie_lock); |
---|
1080 | free(handler, M_ITHREAD); |
---|
1081 | return (0); |
---|
1082 | } |
---|
1083 | |
---|
1084 | static int |
---|
1085 | intr_event_schedule_thread(struct intr_event *ie, struct intr_thread *it) |
---|
1086 | { |
---|
1087 | struct intr_entropy entropy; |
---|
1088 | struct thread *td; |
---|
1089 | struct thread *ctd; |
---|
1090 | #ifndef __rtems__ |
---|
1091 | struct proc *p; |
---|
1092 | #endif /* __rtems__ */ |
---|
1093 | |
---|
1094 | /* |
---|
1095 | * If no ithread or no handlers, then we have a stray interrupt. |
---|
1096 | */ |
---|
1097 | if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) || it == NULL) |
---|
1098 | return (EINVAL); |
---|
1099 | |
---|
1100 | ctd = curthread; |
---|
1101 | td = it->it_thread; |
---|
1102 | #ifndef __rtems__ |
---|
1103 | p = td->td_proc; |
---|
1104 | #endif /* __rtems__ */ |
---|
1105 | |
---|
1106 | /* |
---|
1107 | * If any of the handlers for this ithread claim to be good |
---|
1108 | * sources of entropy, then gather some. |
---|
1109 | */ |
---|
1110 | if (harvest.interrupt && ie->ie_flags & IE_ENTROPY) { |
---|
1111 | CTR3(KTR_INTR, "%s: pid %d (%s) gathering entropy", __func__, |
---|
1112 | p->p_pid, td->td_name); |
---|
1113 | entropy.event = (uintptr_t)ie; |
---|
1114 | entropy.td = ctd; |
---|
1115 | random_harvest(&entropy, sizeof(entropy), 2, 0, |
---|
1116 | RANDOM_INTERRUPT); |
---|
1117 | } |
---|
1118 | |
---|
1119 | KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name)); |
---|
1120 | |
---|
1121 | /* |
---|
1122 | * Set it_need to tell the thread to keep running if it is already |
---|
1123 | * running. Then, lock the thread and see if we actually need to |
---|
1124 | * put it on the runqueue. |
---|
1125 | */ |
---|
1126 | atomic_store_rel_int(&it->it_need, 1); |
---|
1127 | thread_lock(td); |
---|
1128 | if (TD_AWAITING_INTR(td)) { |
---|
1129 | CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid, |
---|
1130 | td->td_name); |
---|
1131 | TD_CLR_IWAIT(td); |
---|
1132 | sched_add(td, SRQ_INTR); |
---|
1133 | } else { |
---|
1134 | CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d", |
---|
1135 | __func__, p->p_pid, td->td_name, it->it_need, td->td_state); |
---|
1136 | } |
---|
1137 | thread_unlock(td); |
---|
1138 | |
---|
1139 | return (0); |
---|
1140 | } |
---|
1141 | #endif /* __rtems__ */ |
---|
1142 | #endif |
---|
1143 | |
---|
1144 | /* |
---|
1145 | * Allow interrupt event binding for software interrupt handlers -- a no-op, |
---|
1146 | * since interrupts are generated in software rather than being directed by |
---|
1147 | * a PIC. |
---|
1148 | */ |
---|
1149 | static int |
---|
1150 | swi_assign_cpu(void *arg, u_char cpu) |
---|
1151 | { |
---|
1152 | |
---|
1153 | return (0); |
---|
1154 | } |
---|
1155 | |
---|
1156 | /* |
---|
1157 | * Add a software interrupt handler to a specified event. If a given event |
---|
1158 | * is not specified, then a new event is created. |
---|
1159 | */ |
---|
1160 | int |
---|
1161 | swi_add(struct intr_event **eventp, const char *name, driver_intr_t handler, |
---|
1162 | void *arg, int pri, enum intr_type flags, void **cookiep) |
---|
1163 | { |
---|
1164 | struct thread *td; |
---|
1165 | struct intr_event *ie; |
---|
1166 | int error; |
---|
1167 | |
---|
1168 | if (flags & INTR_ENTROPY) |
---|
1169 | return (EINVAL); |
---|
1170 | |
---|
1171 | ie = (eventp != NULL) ? *eventp : NULL; |
---|
1172 | |
---|
1173 | if (ie != NULL) { |
---|
1174 | if (!(ie->ie_flags & IE_SOFT)) |
---|
1175 | return (EINVAL); |
---|
1176 | } else { |
---|
1177 | error = intr_event_create(&ie, NULL, IE_SOFT, 0, |
---|
1178 | NULL, NULL, NULL, swi_assign_cpu, "swi%d:", pri); |
---|
1179 | if (error) |
---|
1180 | return (error); |
---|
1181 | if (eventp != NULL) |
---|
1182 | *eventp = ie; |
---|
1183 | } |
---|
1184 | error = intr_event_add_handler(ie, name, NULL, handler, arg, |
---|
1185 | PI_SWI(pri), flags, cookiep); |
---|
1186 | if (error) |
---|
1187 | return (error); |
---|
1188 | #ifndef __rtems__ |
---|
1189 | if (pri == SWI_CLOCK) { |
---|
1190 | td = ie->ie_thread->it_thread; |
---|
1191 | thread_lock(td); |
---|
1192 | td->td_flags |= TDF_NOLOAD; |
---|
1193 | thread_unlock(td); |
---|
1194 | } |
---|
1195 | #else /* __rtems__ */ |
---|
1196 | // Do _not_ ignore the thread in the load avarage |
---|
1197 | #endif /* __rtems__ */ |
---|
1198 | return (0); |
---|
1199 | } |
---|
1200 | |
---|
1201 | /* |
---|
1202 | * Schedule a software interrupt thread. |
---|
1203 | */ |
---|
1204 | void |
---|
1205 | swi_sched(void *cookie, int flags) |
---|
1206 | { |
---|
1207 | struct intr_handler *ih = (struct intr_handler *)cookie; |
---|
1208 | struct intr_event *ie = ih->ih_event; |
---|
1209 | struct intr_entropy entropy; |
---|
1210 | int error; |
---|
1211 | |
---|
1212 | CTR3(KTR_INTR, "swi_sched: %s %s need=%d", ie->ie_name, ih->ih_name, |
---|
1213 | ih->ih_need); |
---|
1214 | |
---|
1215 | if (harvest.swi) { |
---|
1216 | CTR2(KTR_INTR, "swi_sched: pid %d (%s) gathering entropy", |
---|
1217 | curproc->p_pid, curthread->td_name); |
---|
1218 | entropy.event = (uintptr_t)ih; |
---|
1219 | entropy.td = curthread; |
---|
1220 | random_harvest(&entropy, sizeof(entropy), 1, 0, |
---|
1221 | RANDOM_INTERRUPT); |
---|
1222 | } |
---|
1223 | |
---|
1224 | /* |
---|
1225 | * Set ih_need for this handler so that if the ithread is already |
---|
1226 | * running it will execute this handler on the next pass. Otherwise, |
---|
1227 | * it will execute it the next time it runs. |
---|
1228 | */ |
---|
1229 | atomic_store_rel_int(&ih->ih_need, 1); |
---|
1230 | |
---|
1231 | if (!(flags & SWI_DELAY)) { |
---|
1232 | #ifndef __rtems__ |
---|
1233 | PCPU_INC(cnt.v_soft); |
---|
1234 | #endif /* __rtems__ */ |
---|
1235 | #ifdef INTR_FILTER |
---|
1236 | error = intr_event_schedule_thread(ie, ie->ie_thread); |
---|
1237 | #else |
---|
1238 | error = intr_event_schedule_thread(ie); |
---|
1239 | #endif |
---|
1240 | KASSERT(error == 0, ("stray software interrupt")); |
---|
1241 | } |
---|
1242 | } |
---|
1243 | |
---|
1244 | #ifndef __rtems__ |
---|
1245 | /* |
---|
1246 | * Remove a software interrupt handler. Currently this code does not |
---|
1247 | * remove the associated interrupt event if it becomes empty. Calling code |
---|
1248 | * may do so manually via intr_event_destroy(), but that's not really |
---|
1249 | * an optimal interface. |
---|
1250 | */ |
---|
1251 | int |
---|
1252 | swi_remove(void *cookie) |
---|
1253 | { |
---|
1254 | |
---|
1255 | return (intr_event_remove_handler(cookie)); |
---|
1256 | } |
---|
1257 | |
---|
1258 | #ifdef INTR_FILTER |
---|
1259 | static void |
---|
1260 | priv_ithread_execute_handler(struct proc *p, struct intr_handler *ih) |
---|
1261 | { |
---|
1262 | struct intr_event *ie; |
---|
1263 | |
---|
1264 | ie = ih->ih_event; |
---|
1265 | /* |
---|
1266 | * If this handler is marked for death, remove it from |
---|
1267 | * the list of handlers and wake up the sleeper. |
---|
1268 | */ |
---|
1269 | if (ih->ih_flags & IH_DEAD) { |
---|
1270 | mtx_lock(&ie->ie_lock); |
---|
1271 | TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next); |
---|
1272 | ih->ih_flags &= ~IH_DEAD; |
---|
1273 | wakeup(ih); |
---|
1274 | mtx_unlock(&ie->ie_lock); |
---|
1275 | return; |
---|
1276 | } |
---|
1277 | |
---|
1278 | /* Execute this handler. */ |
---|
1279 | CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x", |
---|
1280 | __func__, p->p_pid, (void *)ih->ih_handler, ih->ih_argument, |
---|
1281 | ih->ih_name, ih->ih_flags); |
---|
1282 | |
---|
1283 | if (!(ih->ih_flags & IH_MPSAFE)) |
---|
1284 | mtx_lock(&Giant); |
---|
1285 | ih->ih_handler(ih->ih_argument); |
---|
1286 | if (!(ih->ih_flags & IH_MPSAFE)) |
---|
1287 | mtx_unlock(&Giant); |
---|
1288 | } |
---|
1289 | #endif |
---|
1290 | |
---|
1291 | #endif /* __rtems__ */ |
---|
1292 | /* |
---|
1293 | * This is a public function for use by drivers that mux interrupt |
---|
1294 | * handlers for child devices from their interrupt handler. |
---|
1295 | */ |
---|
1296 | void |
---|
1297 | intr_event_execute_handlers(struct proc *p, struct intr_event *ie) |
---|
1298 | { |
---|
1299 | struct intr_handler *ih, *ihn; |
---|
1300 | |
---|
1301 | TAILQ_FOREACH_SAFE(ih, &ie->ie_handlers, ih_next, ihn) { |
---|
1302 | /* |
---|
1303 | * If this handler is marked for death, remove it from |
---|
1304 | * the list of handlers and wake up the sleeper. |
---|
1305 | */ |
---|
1306 | if (ih->ih_flags & IH_DEAD) { |
---|
1307 | mtx_lock(&ie->ie_lock); |
---|
1308 | TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next); |
---|
1309 | ih->ih_flags &= ~IH_DEAD; |
---|
1310 | wakeup(ih); |
---|
1311 | mtx_unlock(&ie->ie_lock); |
---|
1312 | continue; |
---|
1313 | } |
---|
1314 | |
---|
1315 | /* Skip filter only handlers */ |
---|
1316 | if (ih->ih_handler == NULL) |
---|
1317 | continue; |
---|
1318 | |
---|
1319 | /* |
---|
1320 | * For software interrupt threads, we only execute |
---|
1321 | * handlers that have their need flag set. Hardware |
---|
1322 | * interrupt threads always invoke all of their handlers. |
---|
1323 | */ |
---|
1324 | if (ie->ie_flags & IE_SOFT) { |
---|
1325 | if (atomic_load_acq_int(&ih->ih_need) == 0) |
---|
1326 | continue; |
---|
1327 | else |
---|
1328 | atomic_store_rel_int(&ih->ih_need, 0); |
---|
1329 | } |
---|
1330 | |
---|
1331 | /* Execute this handler. */ |
---|
1332 | CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x", |
---|
1333 | __func__, p->p_pid, (void *)ih->ih_handler, |
---|
1334 | ih->ih_argument, ih->ih_name, ih->ih_flags); |
---|
1335 | |
---|
1336 | if (!(ih->ih_flags & IH_MPSAFE)) |
---|
1337 | mtx_lock(&Giant); |
---|
1338 | ih->ih_handler(ih->ih_argument); |
---|
1339 | if (!(ih->ih_flags & IH_MPSAFE)) |
---|
1340 | mtx_unlock(&Giant); |
---|
1341 | } |
---|
1342 | } |
---|
1343 | |
---|
1344 | static void |
---|
1345 | ithread_execute_handlers(struct proc *p, struct intr_event *ie) |
---|
1346 | { |
---|
1347 | |
---|
1348 | #ifndef __rtems__ |
---|
1349 | /* Interrupt handlers should not sleep. */ |
---|
1350 | if (!(ie->ie_flags & IE_SOFT)) |
---|
1351 | THREAD_NO_SLEEPING(); |
---|
1352 | intr_event_execute_handlers(p, ie); |
---|
1353 | if (!(ie->ie_flags & IE_SOFT)) |
---|
1354 | THREAD_SLEEPING_OK(); |
---|
1355 | #else /* __rtems__ */ |
---|
1356 | /* We only have soft-threads, so the two queries are not necessary. */ |
---|
1357 | intr_event_execute_handlers(p, ie); |
---|
1358 | #endif /* __rtems__ */ |
---|
1359 | |
---|
1360 | /* |
---|
1361 | * Interrupt storm handling: |
---|
1362 | * |
---|
1363 | * If this interrupt source is currently storming, then throttle |
---|
1364 | * it to only fire the handler once per clock tick. |
---|
1365 | * |
---|
1366 | * If this interrupt source is not currently storming, but the |
---|
1367 | * number of back to back interrupts exceeds the storm threshold, |
---|
1368 | * then enter storming mode. |
---|
1369 | */ |
---|
1370 | if (intr_storm_threshold != 0 && ie->ie_count >= intr_storm_threshold && |
---|
1371 | !(ie->ie_flags & IE_SOFT)) { |
---|
1372 | #ifndef __rtems__ |
---|
1373 | /* Report the message only once every second. */ |
---|
1374 | if (ppsratecheck(&ie->ie_warntm, &ie->ie_warncnt, 1)) { |
---|
1375 | printf( |
---|
1376 | "interrupt storm detected on \"%s\"; throttling interrupt source\n", |
---|
1377 | ie->ie_name); |
---|
1378 | } |
---|
1379 | #endif /* __rtems__ */ |
---|
1380 | pause("istorm", 1); |
---|
1381 | } else |
---|
1382 | ie->ie_count++; |
---|
1383 | |
---|
1384 | /* |
---|
1385 | * Now that all the handlers have had a chance to run, reenable |
---|
1386 | * the interrupt source. |
---|
1387 | */ |
---|
1388 | if (ie->ie_post_ithread != NULL) |
---|
1389 | ie->ie_post_ithread(ie->ie_source); |
---|
1390 | } |
---|
1391 | |
---|
1392 | #ifndef INTR_FILTER |
---|
1393 | /* |
---|
1394 | * This is the main code for interrupt threads. |
---|
1395 | */ |
---|
1396 | static void |
---|
1397 | ithread_loop(void *arg) |
---|
1398 | { |
---|
1399 | struct intr_thread *ithd; |
---|
1400 | struct intr_event *ie; |
---|
1401 | struct thread *td; |
---|
1402 | struct proc *p; |
---|
1403 | int wake; |
---|
1404 | |
---|
1405 | td = curthread; |
---|
1406 | #ifndef __rtems__ |
---|
1407 | p = td->td_proc; |
---|
1408 | #else /* __rtems__ */ |
---|
1409 | p = NULL; |
---|
1410 | #endif /* __rtems__ */ |
---|
1411 | ithd = (struct intr_thread *)arg; |
---|
1412 | KASSERT(ithd->it_thread == td, |
---|
1413 | ("%s: ithread and proc linkage out of sync", __func__)); |
---|
1414 | ie = ithd->it_event; |
---|
1415 | ie->ie_count = 0; |
---|
1416 | wake = 0; |
---|
1417 | |
---|
1418 | /* |
---|
1419 | * As long as we have interrupts outstanding, go through the |
---|
1420 | * list of handlers, giving each one a go at it. |
---|
1421 | */ |
---|
1422 | for (;;) { |
---|
1423 | /* |
---|
1424 | * If we are an orphaned thread, then just die. |
---|
1425 | */ |
---|
1426 | if (ithd->it_flags & IT_DEAD) { |
---|
1427 | CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__, |
---|
1428 | p->p_pid, td->td_name); |
---|
1429 | free(ithd, M_ITHREAD); |
---|
1430 | kthread_exit(); |
---|
1431 | } |
---|
1432 | |
---|
1433 | /* |
---|
1434 | * Service interrupts. If another interrupt arrives while |
---|
1435 | * we are running, it will set it_need to note that we |
---|
1436 | * should make another pass. |
---|
1437 | */ |
---|
1438 | while (atomic_load_acq_int(&ithd->it_need) != 0) { |
---|
1439 | /* |
---|
1440 | * This might need a full read and write barrier |
---|
1441 | * to make sure that this write posts before any |
---|
1442 | * of the memory or device accesses in the |
---|
1443 | * handlers. |
---|
1444 | */ |
---|
1445 | atomic_store_rel_int(&ithd->it_need, 0); |
---|
1446 | ithread_execute_handlers(p, ie); |
---|
1447 | } |
---|
1448 | WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread"); |
---|
1449 | mtx_assert(&Giant, MA_NOTOWNED); |
---|
1450 | |
---|
1451 | /* |
---|
1452 | * Processed all our interrupts. Now get the sched |
---|
1453 | * lock. This may take a while and it_need may get |
---|
1454 | * set again, so we have to check it again. |
---|
1455 | */ |
---|
1456 | thread_lock(td); |
---|
1457 | if ((atomic_load_acq_int(&ithd->it_need) == 0) && |
---|
1458 | !(ithd->it_flags & (IT_DEAD | IT_WAIT))) { |
---|
1459 | #ifndef __rtems__ |
---|
1460 | TD_SET_IWAIT(td); |
---|
1461 | ie->ie_count = 0; |
---|
1462 | mi_switch(SW_VOL | SWT_IWAIT, NULL); |
---|
1463 | #else /* __rtems__ */ |
---|
1464 | /* wait for wakeup event |
---|
1465 | * TODO: eventually replace event by a better mechanism |
---|
1466 | */ |
---|
1467 | rtems_event_set event_out; |
---|
1468 | rtems_status_code sc = rtems_event_receive( |
---|
1469 | RTEMSBSD_SWI_WAKEUP_EVENT, |
---|
1470 | RTEMS_WAIT | RTEMS_EVENT_ALL, |
---|
1471 | RTEMS_NO_TIMEOUT, |
---|
1472 | &event_out); |
---|
1473 | BSD_ASSERT(sc == RTEMS_SUCCESSFUL); |
---|
1474 | #endif /* __rtems__ */ |
---|
1475 | } |
---|
1476 | if (ithd->it_flags & IT_WAIT) { |
---|
1477 | wake = 1; |
---|
1478 | ithd->it_flags &= ~IT_WAIT; |
---|
1479 | } |
---|
1480 | thread_unlock(td); |
---|
1481 | if (wake) { |
---|
1482 | wakeup(ithd); |
---|
1483 | wake = 0; |
---|
1484 | } |
---|
1485 | } |
---|
1486 | } |
---|
1487 | #ifndef __rtems__ |
---|
1488 | |
---|
1489 | /* |
---|
1490 | * Main interrupt handling body. |
---|
1491 | * |
---|
1492 | * Input: |
---|
1493 | * o ie: the event connected to this interrupt. |
---|
1494 | * o frame: some archs (i.e. i386) pass a frame to some. |
---|
1495 | * handlers as their main argument. |
---|
1496 | * Return value: |
---|
1497 | * o 0: everything ok. |
---|
1498 | * o EINVAL: stray interrupt. |
---|
1499 | */ |
---|
1500 | int |
---|
1501 | intr_event_handle(struct intr_event *ie, struct trapframe *frame) |
---|
1502 | { |
---|
1503 | struct intr_handler *ih; |
---|
1504 | struct trapframe *oldframe; |
---|
1505 | struct thread *td; |
---|
1506 | int error, ret, thread; |
---|
1507 | |
---|
1508 | td = curthread; |
---|
1509 | |
---|
1510 | /* An interrupt with no event or handlers is a stray interrupt. */ |
---|
1511 | if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers)) |
---|
1512 | return (EINVAL); |
---|
1513 | |
---|
1514 | /* |
---|
1515 | * Execute fast interrupt handlers directly. |
---|
1516 | * To support clock handlers, if a handler registers |
---|
1517 | * with a NULL argument, then we pass it a pointer to |
---|
1518 | * a trapframe as its argument. |
---|
1519 | */ |
---|
1520 | td->td_intr_nesting_level++; |
---|
1521 | thread = 0; |
---|
1522 | ret = 0; |
---|
1523 | critical_enter(); |
---|
1524 | oldframe = td->td_intr_frame; |
---|
1525 | td->td_intr_frame = frame; |
---|
1526 | TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { |
---|
1527 | if (ih->ih_filter == NULL) { |
---|
1528 | thread = 1; |
---|
1529 | continue; |
---|
1530 | } |
---|
1531 | CTR4(KTR_INTR, "%s: exec %p(%p) for %s", __func__, |
---|
1532 | ih->ih_filter, ih->ih_argument == NULL ? frame : |
---|
1533 | ih->ih_argument, ih->ih_name); |
---|
1534 | if (ih->ih_argument == NULL) |
---|
1535 | ret = ih->ih_filter(frame); |
---|
1536 | else |
---|
1537 | ret = ih->ih_filter(ih->ih_argument); |
---|
1538 | KASSERT(ret == FILTER_STRAY || |
---|
1539 | ((ret & (FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) != 0 && |
---|
1540 | (ret & ~(FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) == 0), |
---|
1541 | ("%s: incorrect return value %#x from %s", __func__, ret, |
---|
1542 | ih->ih_name)); |
---|
1543 | |
---|
1544 | /* |
---|
1545 | * Wrapper handler special handling: |
---|
1546 | * |
---|
1547 | * in some particular cases (like pccard and pccbb), |
---|
1548 | * the _real_ device handler is wrapped in a couple of |
---|
1549 | * functions - a filter wrapper and an ithread wrapper. |
---|
1550 | * In this case (and just in this case), the filter wrapper |
---|
1551 | * could ask the system to schedule the ithread and mask |
---|
1552 | * the interrupt source if the wrapped handler is composed |
---|
1553 | * of just an ithread handler. |
---|
1554 | * |
---|
1555 | * TODO: write a generic wrapper to avoid people rolling |
---|
1556 | * their own |
---|
1557 | */ |
---|
1558 | if (!thread) { |
---|
1559 | if (ret == FILTER_SCHEDULE_THREAD) |
---|
1560 | thread = 1; |
---|
1561 | } |
---|
1562 | } |
---|
1563 | td->td_intr_frame = oldframe; |
---|
1564 | |
---|
1565 | if (thread) { |
---|
1566 | if (ie->ie_pre_ithread != NULL) |
---|
1567 | ie->ie_pre_ithread(ie->ie_source); |
---|
1568 | } else { |
---|
1569 | if (ie->ie_post_filter != NULL) |
---|
1570 | ie->ie_post_filter(ie->ie_source); |
---|
1571 | } |
---|
1572 | |
---|
1573 | /* Schedule the ithread if needed. */ |
---|
1574 | if (thread) { |
---|
1575 | error = intr_event_schedule_thread(ie); |
---|
1576 | #ifndef XEN |
---|
1577 | KASSERT(error == 0, ("bad stray interrupt")); |
---|
1578 | #else |
---|
1579 | if (error != 0) |
---|
1580 | log(LOG_WARNING, "bad stray interrupt"); |
---|
1581 | #endif |
---|
1582 | } |
---|
1583 | critical_exit(); |
---|
1584 | td->td_intr_nesting_level--; |
---|
1585 | return (0); |
---|
1586 | } |
---|
1587 | #endif /* __rtems__ */ |
---|
1588 | #else |
---|
1589 | #ifndef __rtems__ |
---|
1590 | /* |
---|
1591 | * This is the main code for interrupt threads. |
---|
1592 | */ |
---|
1593 | static void |
---|
1594 | ithread_loop(void *arg) |
---|
1595 | { |
---|
1596 | struct intr_thread *ithd; |
---|
1597 | struct intr_handler *ih; |
---|
1598 | struct intr_event *ie; |
---|
1599 | struct thread *td; |
---|
1600 | struct proc *p; |
---|
1601 | int priv; |
---|
1602 | int wake; |
---|
1603 | |
---|
1604 | td = curthread; |
---|
1605 | p = td->td_proc; |
---|
1606 | ih = (struct intr_handler *)arg; |
---|
1607 | priv = (ih->ih_thread != NULL) ? 1 : 0; |
---|
1608 | ithd = (priv) ? ih->ih_thread : ih->ih_event->ie_thread; |
---|
1609 | KASSERT(ithd->it_thread == td, |
---|
1610 | ("%s: ithread and proc linkage out of sync", __func__)); |
---|
1611 | ie = ithd->it_event; |
---|
1612 | ie->ie_count = 0; |
---|
1613 | wake = 0; |
---|
1614 | |
---|
1615 | /* |
---|
1616 | * As long as we have interrupts outstanding, go through the |
---|
1617 | * list of handlers, giving each one a go at it. |
---|
1618 | */ |
---|
1619 | for (;;) { |
---|
1620 | /* |
---|
1621 | * If we are an orphaned thread, then just die. |
---|
1622 | */ |
---|
1623 | if (ithd->it_flags & IT_DEAD) { |
---|
1624 | CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__, |
---|
1625 | p->p_pid, td->td_name); |
---|
1626 | free(ithd, M_ITHREAD); |
---|
1627 | kthread_exit(); |
---|
1628 | } |
---|
1629 | |
---|
1630 | /* |
---|
1631 | * Service interrupts. If another interrupt arrives while |
---|
1632 | * we are running, it will set it_need to note that we |
---|
1633 | * should make another pass. |
---|
1634 | */ |
---|
1635 | while (atomic_load_acq_int(&ithd->it_need) != 0) { |
---|
1636 | /* |
---|
1637 | * This might need a full read and write barrier |
---|
1638 | * to make sure that this write posts before any |
---|
1639 | * of the memory or device accesses in the |
---|
1640 | * handlers. |
---|
1641 | */ |
---|
1642 | atomic_store_rel_int(&ithd->it_need, 0); |
---|
1643 | if (priv) |
---|
1644 | priv_ithread_execute_handler(p, ih); |
---|
1645 | else |
---|
1646 | ithread_execute_handlers(p, ie); |
---|
1647 | } |
---|
1648 | WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread"); |
---|
1649 | mtx_assert(&Giant, MA_NOTOWNED); |
---|
1650 | |
---|
1651 | /* |
---|
1652 | * Processed all our interrupts. Now get the sched |
---|
1653 | * lock. This may take a while and it_need may get |
---|
1654 | * set again, so we have to check it again. |
---|
1655 | */ |
---|
1656 | thread_lock(td); |
---|
1657 | if ((atomic_load_acq_int(&ithd->it_need) == 0) && |
---|
1658 | !(ithd->it_flags & (IT_DEAD | IT_WAIT))) { |
---|
1659 | TD_SET_IWAIT(td); |
---|
1660 | ie->ie_count = 0; |
---|
1661 | mi_switch(SW_VOL | SWT_IWAIT, NULL); |
---|
1662 | } |
---|
1663 | if (ithd->it_flags & IT_WAIT) { |
---|
1664 | wake = 1; |
---|
1665 | ithd->it_flags &= ~IT_WAIT; |
---|
1666 | } |
---|
1667 | thread_unlock(td); |
---|
1668 | if (wake) { |
---|
1669 | wakeup(ithd); |
---|
1670 | wake = 0; |
---|
1671 | } |
---|
1672 | } |
---|
1673 | } |
---|
1674 | |
---|
1675 | /* |
---|
1676 | * Main loop for interrupt filter. |
---|
1677 | * |
---|
1678 | * Some architectures (i386, amd64 and arm) require the optional frame |
---|
1679 | * parameter, and use it as the main argument for fast handler execution |
---|
1680 | * when ih_argument == NULL. |
---|
1681 | * |
---|
1682 | * Return value: |
---|
1683 | * o FILTER_STRAY: No filter recognized the event, and no |
---|
1684 | * filter-less handler is registered on this |
---|
1685 | * line. |
---|
1686 | * o FILTER_HANDLED: A filter claimed the event and served it. |
---|
1687 | * o FILTER_SCHEDULE_THREAD: No filter claimed the event, but there's at |
---|
1688 | * least one filter-less handler on this line. |
---|
1689 | * o FILTER_HANDLED | |
---|
1690 | * FILTER_SCHEDULE_THREAD: A filter claimed the event, and asked for |
---|
1691 | * scheduling the per-handler ithread. |
---|
1692 | * |
---|
1693 | * In case an ithread has to be scheduled, in *ithd there will be a |
---|
1694 | * pointer to a struct intr_thread containing the thread to be |
---|
1695 | * scheduled. |
---|
1696 | */ |
---|
1697 | |
---|
1698 | static int |
---|
1699 | intr_filter_loop(struct intr_event *ie, struct trapframe *frame, |
---|
1700 | struct intr_thread **ithd) |
---|
1701 | { |
---|
1702 | struct intr_handler *ih; |
---|
1703 | void *arg; |
---|
1704 | int ret, thread_only; |
---|
1705 | |
---|
1706 | ret = 0; |
---|
1707 | thread_only = 0; |
---|
1708 | TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { |
---|
1709 | /* |
---|
1710 | * Execute fast interrupt handlers directly. |
---|
1711 | * To support clock handlers, if a handler registers |
---|
1712 | * with a NULL argument, then we pass it a pointer to |
---|
1713 | * a trapframe as its argument. |
---|
1714 | */ |
---|
1715 | arg = ((ih->ih_argument == NULL) ? frame : ih->ih_argument); |
---|
1716 | |
---|
1717 | CTR5(KTR_INTR, "%s: exec %p/%p(%p) for %s", __func__, |
---|
1718 | ih->ih_filter, ih->ih_handler, arg, ih->ih_name); |
---|
1719 | |
---|
1720 | if (ih->ih_filter != NULL) |
---|
1721 | ret = ih->ih_filter(arg); |
---|
1722 | else { |
---|
1723 | thread_only = 1; |
---|
1724 | continue; |
---|
1725 | } |
---|
1726 | KASSERT(ret == FILTER_STRAY || |
---|
1727 | ((ret & (FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) != 0 && |
---|
1728 | (ret & ~(FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) == 0), |
---|
1729 | ("%s: incorrect return value %#x from %s", __func__, ret, |
---|
1730 | ih->ih_name)); |
---|
1731 | if (ret & FILTER_STRAY) |
---|
1732 | continue; |
---|
1733 | else { |
---|
1734 | *ithd = ih->ih_thread; |
---|
1735 | return (ret); |
---|
1736 | } |
---|
1737 | } |
---|
1738 | |
---|
1739 | /* |
---|
1740 | * No filters handled the interrupt and we have at least |
---|
1741 | * one handler without a filter. In this case, we schedule |
---|
1742 | * all of the filter-less handlers to run in the ithread. |
---|
1743 | */ |
---|
1744 | if (thread_only) { |
---|
1745 | *ithd = ie->ie_thread; |
---|
1746 | return (FILTER_SCHEDULE_THREAD); |
---|
1747 | } |
---|
1748 | return (FILTER_STRAY); |
---|
1749 | } |
---|
1750 | |
---|
1751 | /* |
---|
1752 | * Main interrupt handling body. |
---|
1753 | * |
---|
1754 | * Input: |
---|
1755 | * o ie: the event connected to this interrupt. |
---|
1756 | * o frame: some archs (i.e. i386) pass a frame to some. |
---|
1757 | * handlers as their main argument. |
---|
1758 | * Return value: |
---|
1759 | * o 0: everything ok. |
---|
1760 | * o EINVAL: stray interrupt. |
---|
1761 | */ |
---|
1762 | int |
---|
1763 | intr_event_handle(struct intr_event *ie, struct trapframe *frame) |
---|
1764 | { |
---|
1765 | struct intr_thread *ithd; |
---|
1766 | struct trapframe *oldframe; |
---|
1767 | struct thread *td; |
---|
1768 | int thread; |
---|
1769 | |
---|
1770 | ithd = NULL; |
---|
1771 | td = curthread; |
---|
1772 | |
---|
1773 | if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers)) |
---|
1774 | return (EINVAL); |
---|
1775 | |
---|
1776 | td->td_intr_nesting_level++; |
---|
1777 | thread = 0; |
---|
1778 | critical_enter(); |
---|
1779 | oldframe = td->td_intr_frame; |
---|
1780 | td->td_intr_frame = frame; |
---|
1781 | thread = intr_filter_loop(ie, frame, &ithd); |
---|
1782 | if (thread & FILTER_HANDLED) { |
---|
1783 | if (ie->ie_post_filter != NULL) |
---|
1784 | ie->ie_post_filter(ie->ie_source); |
---|
1785 | } else { |
---|
1786 | if (ie->ie_pre_ithread != NULL) |
---|
1787 | ie->ie_pre_ithread(ie->ie_source); |
---|
1788 | } |
---|
1789 | td->td_intr_frame = oldframe; |
---|
1790 | critical_exit(); |
---|
1791 | |
---|
1792 | /* Interrupt storm logic */ |
---|
1793 | if (thread & FILTER_STRAY) { |
---|
1794 | ie->ie_count++; |
---|
1795 | if (ie->ie_count < intr_storm_threshold) |
---|
1796 | printf("Interrupt stray detection not present\n"); |
---|
1797 | } |
---|
1798 | |
---|
1799 | /* Schedule an ithread if needed. */ |
---|
1800 | if (thread & FILTER_SCHEDULE_THREAD) { |
---|
1801 | if (intr_event_schedule_thread(ie, ithd) != 0) |
---|
1802 | panic("%s: impossible stray interrupt", __func__); |
---|
1803 | } |
---|
1804 | td->td_intr_nesting_level--; |
---|
1805 | return (0); |
---|
1806 | } |
---|
1807 | #endif /* __rtems__ */ |
---|
1808 | #endif |
---|
1809 | #ifndef __rtems__ |
---|
1810 | |
---|
1811 | #ifdef DDB |
---|
1812 | /* |
---|
1813 | * Dump details about an interrupt handler |
---|
1814 | */ |
---|
1815 | static void |
---|
1816 | db_dump_intrhand(struct intr_handler *ih) |
---|
1817 | { |
---|
1818 | int comma; |
---|
1819 | |
---|
1820 | db_printf("\t%-10s ", ih->ih_name); |
---|
1821 | switch (ih->ih_pri) { |
---|
1822 | case PI_REALTIME: |
---|
1823 | db_printf("CLK "); |
---|
1824 | break; |
---|
1825 | case PI_AV: |
---|
1826 | db_printf("AV "); |
---|
1827 | break; |
---|
1828 | case PI_TTY: |
---|
1829 | db_printf("TTY "); |
---|
1830 | break; |
---|
1831 | case PI_NET: |
---|
1832 | db_printf("NET "); |
---|
1833 | break; |
---|
1834 | case PI_DISK: |
---|
1835 | db_printf("DISK"); |
---|
1836 | break; |
---|
1837 | case PI_DULL: |
---|
1838 | db_printf("DULL"); |
---|
1839 | break; |
---|
1840 | default: |
---|
1841 | if (ih->ih_pri >= PI_SOFT) |
---|
1842 | db_printf("SWI "); |
---|
1843 | else |
---|
1844 | db_printf("%4u", ih->ih_pri); |
---|
1845 | break; |
---|
1846 | } |
---|
1847 | db_printf(" "); |
---|
1848 | if (ih->ih_filter != NULL) { |
---|
1849 | db_printf("[F]"); |
---|
1850 | db_printsym((uintptr_t)ih->ih_filter, DB_STGY_PROC); |
---|
1851 | } |
---|
1852 | if (ih->ih_handler != NULL) { |
---|
1853 | if (ih->ih_filter != NULL) |
---|
1854 | db_printf(","); |
---|
1855 | db_printf("[H]"); |
---|
1856 | db_printsym((uintptr_t)ih->ih_handler, DB_STGY_PROC); |
---|
1857 | } |
---|
1858 | db_printf("(%p)", ih->ih_argument); |
---|
1859 | if (ih->ih_need || |
---|
1860 | (ih->ih_flags & (IH_EXCLUSIVE | IH_ENTROPY | IH_DEAD | |
---|
1861 | IH_MPSAFE)) != 0) { |
---|
1862 | db_printf(" {"); |
---|
1863 | comma = 0; |
---|
1864 | if (ih->ih_flags & IH_EXCLUSIVE) { |
---|
1865 | if (comma) |
---|
1866 | db_printf(", "); |
---|
1867 | db_printf("EXCL"); |
---|
1868 | comma = 1; |
---|
1869 | } |
---|
1870 | if (ih->ih_flags & IH_ENTROPY) { |
---|
1871 | if (comma) |
---|
1872 | db_printf(", "); |
---|
1873 | db_printf("ENTROPY"); |
---|
1874 | comma = 1; |
---|
1875 | } |
---|
1876 | if (ih->ih_flags & IH_DEAD) { |
---|
1877 | if (comma) |
---|
1878 | db_printf(", "); |
---|
1879 | db_printf("DEAD"); |
---|
1880 | comma = 1; |
---|
1881 | } |
---|
1882 | if (ih->ih_flags & IH_MPSAFE) { |
---|
1883 | if (comma) |
---|
1884 | db_printf(", "); |
---|
1885 | db_printf("MPSAFE"); |
---|
1886 | comma = 1; |
---|
1887 | } |
---|
1888 | if (ih->ih_need) { |
---|
1889 | if (comma) |
---|
1890 | db_printf(", "); |
---|
1891 | db_printf("NEED"); |
---|
1892 | } |
---|
1893 | db_printf("}"); |
---|
1894 | } |
---|
1895 | db_printf("\n"); |
---|
1896 | } |
---|
1897 | |
---|
1898 | /* |
---|
1899 | * Dump details about a event. |
---|
1900 | */ |
---|
1901 | void |
---|
1902 | db_dump_intr_event(struct intr_event *ie, int handlers) |
---|
1903 | { |
---|
1904 | struct intr_handler *ih; |
---|
1905 | struct intr_thread *it; |
---|
1906 | int comma; |
---|
1907 | |
---|
1908 | db_printf("%s ", ie->ie_fullname); |
---|
1909 | it = ie->ie_thread; |
---|
1910 | if (it != NULL) |
---|
1911 | db_printf("(pid %d)", it->it_thread->td_proc->p_pid); |
---|
1912 | else |
---|
1913 | db_printf("(no thread)"); |
---|
1914 | if ((ie->ie_flags & (IE_SOFT | IE_ENTROPY | IE_ADDING_THREAD)) != 0 || |
---|
1915 | (it != NULL && it->it_need)) { |
---|
1916 | db_printf(" {"); |
---|
1917 | comma = 0; |
---|
1918 | if (ie->ie_flags & IE_SOFT) { |
---|
1919 | db_printf("SOFT"); |
---|
1920 | comma = 1; |
---|
1921 | } |
---|
1922 | if (ie->ie_flags & IE_ENTROPY) { |
---|
1923 | if (comma) |
---|
1924 | db_printf(", "); |
---|
1925 | db_printf("ENTROPY"); |
---|
1926 | comma = 1; |
---|
1927 | } |
---|
1928 | if (ie->ie_flags & IE_ADDING_THREAD) { |
---|
1929 | if (comma) |
---|
1930 | db_printf(", "); |
---|
1931 | db_printf("ADDING_THREAD"); |
---|
1932 | comma = 1; |
---|
1933 | } |
---|
1934 | if (it != NULL && it->it_need) { |
---|
1935 | if (comma) |
---|
1936 | db_printf(", "); |
---|
1937 | db_printf("NEED"); |
---|
1938 | } |
---|
1939 | db_printf("}"); |
---|
1940 | } |
---|
1941 | db_printf("\n"); |
---|
1942 | |
---|
1943 | if (handlers) |
---|
1944 | TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) |
---|
1945 | db_dump_intrhand(ih); |
---|
1946 | } |
---|
1947 | |
---|
1948 | /* |
---|
1949 | * Dump data about interrupt handlers |
---|
1950 | */ |
---|
1951 | DB_SHOW_COMMAND(intr, db_show_intr) |
---|
1952 | { |
---|
1953 | struct intr_event *ie; |
---|
1954 | int all, verbose; |
---|
1955 | |
---|
1956 | verbose = index(modif, 'v') != NULL; |
---|
1957 | all = index(modif, 'a') != NULL; |
---|
1958 | TAILQ_FOREACH(ie, &event_list, ie_list) { |
---|
1959 | if (!all && TAILQ_EMPTY(&ie->ie_handlers)) |
---|
1960 | continue; |
---|
1961 | db_dump_intr_event(ie, verbose); |
---|
1962 | if (db_pager_quit) |
---|
1963 | break; |
---|
1964 | } |
---|
1965 | } |
---|
1966 | #endif /* DDB */ |
---|
1967 | |
---|
1968 | /* |
---|
1969 | * Start standard software interrupt threads |
---|
1970 | */ |
---|
1971 | static void |
---|
1972 | start_softintr(void *dummy) |
---|
1973 | { |
---|
1974 | |
---|
1975 | if (swi_add(NULL, "vm", swi_vm, NULL, SWI_VM, INTR_MPSAFE, &vm_ih)) |
---|
1976 | panic("died while creating vm swi ithread"); |
---|
1977 | } |
---|
1978 | SYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr, |
---|
1979 | NULL); |
---|
1980 | |
---|
1981 | /* |
---|
1982 | * Sysctls used by systat and others: hw.intrnames and hw.intrcnt. |
---|
1983 | * The data for this machine dependent, and the declarations are in machine |
---|
1984 | * dependent code. The layout of intrnames and intrcnt however is machine |
---|
1985 | * independent. |
---|
1986 | * |
---|
1987 | * We do not know the length of intrcnt and intrnames at compile time, so |
---|
1988 | * calculate things at run time. |
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1989 | */ |
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1990 | static int |
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1991 | sysctl_intrnames(SYSCTL_HANDLER_ARGS) |
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1992 | { |
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1993 | return (sysctl_handle_opaque(oidp, intrnames, sintrnames, req)); |
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1994 | } |
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1995 | |
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1996 | SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD, |
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1997 | NULL, 0, sysctl_intrnames, "", "Interrupt Names"); |
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1998 | |
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1999 | static int |
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2000 | sysctl_intrcnt(SYSCTL_HANDLER_ARGS) |
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2001 | { |
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2002 | return (sysctl_handle_opaque(oidp, intrcnt, sintrcnt, req)); |
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2003 | } |
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2004 | |
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2005 | SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD, |
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2006 | NULL, 0, sysctl_intrcnt, "", "Interrupt Counts"); |
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2007 | |
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2008 | #ifdef DDB |
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2009 | /* |
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2010 | * DDB command to dump the interrupt statistics. |
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2011 | */ |
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2012 | DB_SHOW_COMMAND(intrcnt, db_show_intrcnt) |
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2013 | { |
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2014 | u_long *i; |
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2015 | char *cp; |
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2016 | u_int j; |
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2017 | |
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2018 | cp = intrnames; |
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2019 | j = 0; |
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2020 | for (i = intrcnt; j < (sintrcnt / sizeof(u_long)) && !db_pager_quit; |
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2021 | i++, j++) { |
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2022 | if (*cp == '\0') |
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2023 | break; |
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2024 | if (*i != 0) |
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2025 | db_printf("%s\t%lu\n", cp, *i); |
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2026 | cp += strlen(cp) + 1; |
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2027 | } |
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2028 | } |
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2029 | #endif |
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2030 | #endif /* __rtems__ */ |
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