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2260 | hudecek | 1 | /* |
2 | * Copyright (c) 2007 Jan Hudecek |
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3 | * Copyright (c) 2006 Jakub Jermar |
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4 | * All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * |
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10 | * - Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * - Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * - The name of the author may not be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | */ |
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29 | |||
30 | /** @addtogroup genericddi |
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31 | * @{ |
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32 | */ |
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33 | /** @file |
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34 | */ |
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35 | |||
36 | #include <arch.h> |
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37 | #include <config.h> |
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38 | #include <arch/types.h> |
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39 | #include <arch/asm.h> |
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40 | #include <ddi/tasklet.h> |
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41 | #include <synch/spinlock.h> |
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42 | #include <time/delay.h> |
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43 | #include <proc/thread.h> |
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44 | #include <panic.h> |
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45 | #include <print.h> |
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46 | #include <synch/waitq.h> |
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47 | |||
48 | /** Timeout length in the tasklet thread */ |
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49 | #define TASKLET_THREAD_SLEEPDELAY 500 |
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50 | /** Priority of the tasklet thread */ |
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51 | #define TASKLET_THREAD_PRIORITY 10 |
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52 | |||
53 | |||
54 | /** Tasklet state enum */ |
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55 | typedef enum |
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56 | { |
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57 | TASKLET_STATE_NOTACTIVE = 0, |
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58 | TASKLET_STATE_SCHEDULED = 1, |
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59 | TASKLET_STATE_RUNNING = 2, |
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60 | TASKLET_STATE_DISABLED = 4 |
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61 | } tasklet_state_enum; |
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62 | |||
63 | |||
64 | |||
65 | /** Spinlock protecting list of tasklets */ |
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66 | SPINLOCK_INITIALIZE(tasklet_lock); |
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67 | |||
68 | /** array of tasklet lists for every CPU */ |
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69 | tasklet_descriptor_t** tasklet_list; |
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70 | |||
71 | /** Initializes tasklets - except for the tasklet thread */ |
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72 | void tasklet_init(void) |
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73 | { |
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74 | int i; |
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75 | tasklet_list=malloc(sizeof(tasklet_descriptor_t*)*config.cpu_count,0); |
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76 | if (tasklet_list==0) |
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77 | panic_printf("tasklet list mem not allocated\n"); |
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78 | for(i=0;i<config.cpu_count;i++) |
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79 | { |
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80 | tasklet_list[i]=0; |
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81 | } |
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82 | spinlock_initialize(&tasklet_lock, "tasklet_lock"); |
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83 | } |
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84 | |||
85 | /** |
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86 | * Creates and runs the tasklet thread |
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87 | * |
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88 | * @param kernel_task Pointer to the kernel task - for create_thread |
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89 | */ |
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90 | void tasklet_run_tasklet_thread(task_t * kernel_task) |
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91 | { |
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92 | thread_t* t= thread_create(&tasklet_thread, NULL, kernel_task, 0, "tasklet_thread", false); |
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93 | if (t==NULL) |
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94 | { |
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95 | //wtf? |
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96 | panic_printf("tasklet thread not created\n"); |
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97 | } |
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98 | else |
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99 | { |
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100 | //dynamical priority should pick the best |
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101 | // t->priority = TASKLET_THREAD_PRIORITY; |
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102 | thread_ready(t); |
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103 | } |
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104 | } |
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105 | |||
106 | /** Thread which keeps executing scheduled enabled tasklets |
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107 | * @param data not used |
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108 | */ |
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109 | void tasklet_thread(void* data) |
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110 | { |
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111 | waitq_t wq; |
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112 | waitq_initialize(&wq); |
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113 | while (true) |
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114 | { |
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115 | tasklet_do(); |
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116 | waitq_sleep_timeout(&wq,(uint32_t)TASKLET_THREAD_SLEEPDELAY,0); |
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117 | } |
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118 | } |
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119 | |||
120 | /** Initializes tasklet structure |
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121 | * @param func tasklet callback function to be called |
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122 | * @param data pointer to be passed to the tasklet function |
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123 | */ |
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124 | tasklet_descriptor_t* tasklet_register(void (*func)(void* data), void* data) |
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125 | { |
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126 | tasklet_descriptor_t* tasklet=malloc(sizeof(tasklet_descriptor_t),0); |
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127 | tasklet->data = data; |
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128 | tasklet->func = func; |
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129 | tasklet->state = TASKLET_STATE_NOTACTIVE; |
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130 | tasklet->next = 0; |
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131 | return tasklet; |
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132 | } |
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133 | |||
134 | /** Schedules the tasklet for execution on current CPU |
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135 | * @param t tasklet to be scheduled |
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136 | */ |
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137 | void tasklet_schedule(tasklet_descriptor_t* t) |
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138 | { |
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139 | spinlock_lock(&tasklet_lock); |
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140 | //clear notactive, running and scheduled flags |
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141 | t->state &= TASKLET_STATE_DISABLED; |
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142 | //set the scheduled flag |
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143 | t->state |= TASKLET_STATE_SCHEDULED; |
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144 | t->next=tasklet_list[CPU->id]; |
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145 | tasklet_list[CPU->id]=t; |
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146 | spinlock_unlock(&tasklet_lock); |
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147 | } |
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148 | |||
149 | /** Tasklet will not be run, even if scheduled |
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150 | * @param t tasklet to be disabled |
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151 | */ |
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152 | void tasklet_disable(tasklet_descriptor_t* t) |
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153 | { |
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154 | spinlock_lock(&tasklet_lock); |
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155 | //set the disabled flag |
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156 | t->state |= TASKLET_STATE_DISABLED; |
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157 | spinlock_unlock(&tasklet_lock); |
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158 | } |
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159 | |||
160 | /** Tasklet will be run if scheduled |
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161 | * @param t tasklet to be enabled |
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162 | */ |
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163 | void tasklet_enable(tasklet_descriptor_t* t) |
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164 | { |
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165 | spinlock_lock(&tasklet_lock); |
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166 | //clear the disabled flag |
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167 | t->state &= ~TASKLET_STATE_DISABLED; |
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168 | spinlock_unlock(&tasklet_lock); |
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169 | } |
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170 | |||
171 | |||
172 | |||
173 | |||
174 | /** Executes scheduled enabled tasklets */ |
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175 | void tasklet_do(void) |
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176 | { |
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177 | int i; |
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178 | spinlock_lock(&tasklet_lock); |
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179 | for(i=0;i<config.cpu_count;i++) |
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180 | { |
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181 | tasklet_descriptor_t* t = tasklet_list[CPU->id]; |
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182 | //empty the queue of tasklets |
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183 | tasklet_list[CPU->id]=0; |
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184 | while (t) |
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185 | { |
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186 | if (!(t->state & TASKLET_STATE_DISABLED)) |
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187 | { |
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188 | if (t->func) |
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189 | { |
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190 | #ifdef DEBUG |
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191 | printf("tasklet - calling tasklet!!!\n"); |
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192 | delay((uint32_t)1000000); |
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193 | #endif |
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194 | t->state = TASKLET_STATE_RUNNING; |
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195 | t->func(t->data); |
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196 | t->state = TASKLET_STATE_NOTACTIVE; |
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197 | } |
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198 | else |
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199 | panic_printf("tasklet func NULL\n"); |
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200 | } |
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201 | else |
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202 | { //return it back to the queue of scheduled tasklets |
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203 | t->next = tasklet_list[CPU->id]; |
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204 | tasklet_list[CPU->id] = t; |
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205 | } |
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206 | t=t->next; |
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207 | } |
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208 | //TODO: switch to another CPU, synched with kcpulb, |
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209 | } |
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210 | spinlock_unlock(&tasklet_lock); |
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211 | } |
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212 | |||
213 | /** Frees the tasklet structure when no longer needed |
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214 | * @param tasklet to be freed |
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215 | */ |
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216 | void tasklet_free(tasklet_descriptor_t* t) |
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217 | { |
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218 | if (t->state == TASKLET_STATE_NOTACTIVE) |
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219 | free(t); |
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220 | else |
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221 | panic_printf("attempting to free an active tasklet"); |
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222 | } |
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223 | |||
224 |