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) 1999-2002 Poul-Henning Kamp |
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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, this list of conditions and the following disclaimer. |
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12 | * 2. 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 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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26 | * 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/sys/param.h> |
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33 | #include <sys/kernel.h> |
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34 | #include <sys/systm.h> |
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35 | #include <sys/bus.h> |
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36 | #include <sys/bio.h> |
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37 | #include <rtems/bsd/sys/lock.h> |
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38 | #include <sys/mutex.h> |
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39 | #include <sys/module.h> |
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40 | #include <sys/malloc.h> |
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41 | #include <sys/conf.h> |
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42 | #include <sys/vnode.h> |
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43 | #include <sys/queue.h> |
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44 | #include <sys/poll.h> |
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45 | #include <sys/sx.h> |
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46 | #include <sys/ctype.h> |
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47 | #include <sys/ucred.h> |
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48 | #include <sys/taskqueue.h> |
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49 | #include <machine/stdarg.h> |
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50 | |
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51 | #include <fs/devfs/devfs_int.h> |
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52 | #include <vm/vm.h> |
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53 | |
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54 | static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); |
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55 | |
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56 | struct mtx devmtx; |
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57 | static void destroy_devl(struct cdev *dev); |
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58 | static int destroy_dev_sched_cbl(struct cdev *dev, |
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59 | void (*cb)(void *), void *arg); |
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60 | static int make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, |
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61 | int unit, struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, |
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62 | va_list ap); |
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63 | |
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64 | static struct cdev_priv_list cdevp_free_list = |
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65 | TAILQ_HEAD_INITIALIZER(cdevp_free_list); |
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66 | static SLIST_HEAD(free_cdevsw, cdevsw) cdevsw_gt_post_list = |
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67 | SLIST_HEAD_INITIALIZER(cdevsw_gt_post_list); |
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68 | |
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69 | void |
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70 | dev_lock(void) |
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71 | { |
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72 | |
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73 | mtx_lock(&devmtx); |
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74 | } |
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75 | |
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76 | /* |
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77 | * Free all the memory collected while the cdev mutex was |
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78 | * locked. Since devmtx is after the system map mutex, free() cannot |
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79 | * be called immediately and is postponed until cdev mutex can be |
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80 | * dropped. |
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81 | */ |
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82 | static void |
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83 | dev_unlock_and_free(void) |
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84 | { |
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85 | struct cdev_priv_list cdp_free; |
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86 | struct free_cdevsw csw_free; |
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87 | struct cdev_priv *cdp; |
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88 | struct cdevsw *csw; |
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89 | |
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90 | mtx_assert(&devmtx, MA_OWNED); |
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91 | |
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92 | /* |
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93 | * Make the local copy of the list heads while the dev_mtx is |
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94 | * held. Free it later. |
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95 | */ |
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96 | TAILQ_INIT(&cdp_free); |
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97 | TAILQ_CONCAT(&cdp_free, &cdevp_free_list, cdp_list); |
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98 | csw_free = cdevsw_gt_post_list; |
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99 | SLIST_INIT(&cdevsw_gt_post_list); |
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100 | |
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101 | mtx_unlock(&devmtx); |
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102 | |
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103 | while ((cdp = TAILQ_FIRST(&cdp_free)) != NULL) { |
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104 | TAILQ_REMOVE(&cdp_free, cdp, cdp_list); |
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105 | devfs_free(&cdp->cdp_c); |
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106 | } |
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107 | while ((csw = SLIST_FIRST(&csw_free)) != NULL) { |
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108 | SLIST_REMOVE_HEAD(&csw_free, d_postfree_list); |
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109 | free(csw, M_DEVT); |
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110 | } |
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111 | } |
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112 | |
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113 | static void |
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114 | dev_free_devlocked(struct cdev *cdev) |
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115 | { |
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116 | struct cdev_priv *cdp; |
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117 | |
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118 | mtx_assert(&devmtx, MA_OWNED); |
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119 | cdp = cdev2priv(cdev); |
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120 | KASSERT((cdp->cdp_flags & CDP_UNREF_DTR) == 0, |
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121 | ("destroy_dev() was not called after delist_dev(%p)", cdev)); |
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122 | TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list); |
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123 | } |
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124 | |
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125 | static void |
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126 | cdevsw_free_devlocked(struct cdevsw *csw) |
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127 | { |
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128 | |
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129 | mtx_assert(&devmtx, MA_OWNED); |
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130 | SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list); |
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131 | } |
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132 | |
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133 | void |
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134 | dev_unlock(void) |
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135 | { |
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136 | |
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137 | mtx_unlock(&devmtx); |
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138 | } |
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139 | |
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140 | void |
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141 | dev_ref(struct cdev *dev) |
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142 | { |
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143 | |
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144 | mtx_assert(&devmtx, MA_NOTOWNED); |
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145 | mtx_lock(&devmtx); |
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146 | dev->si_refcount++; |
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147 | mtx_unlock(&devmtx); |
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148 | } |
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149 | |
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150 | void |
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151 | dev_refl(struct cdev *dev) |
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152 | { |
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153 | |
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154 | mtx_assert(&devmtx, MA_OWNED); |
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155 | dev->si_refcount++; |
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156 | } |
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157 | |
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158 | void |
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159 | dev_rel(struct cdev *dev) |
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160 | { |
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161 | int flag = 0; |
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162 | |
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163 | mtx_assert(&devmtx, MA_NOTOWNED); |
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164 | dev_lock(); |
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165 | dev->si_refcount--; |
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166 | KASSERT(dev->si_refcount >= 0, |
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167 | ("dev_rel(%s) gave negative count", devtoname(dev))); |
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168 | #if 0 |
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169 | if (dev->si_usecount == 0 && |
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170 | (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED)) |
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171 | ; |
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172 | else |
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173 | #endif |
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174 | if (dev->si_devsw == NULL && dev->si_refcount == 0) { |
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175 | LIST_REMOVE(dev, si_list); |
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176 | flag = 1; |
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177 | } |
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178 | dev_unlock(); |
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179 | if (flag) |
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180 | devfs_free(dev); |
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181 | } |
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182 | |
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183 | struct cdevsw * |
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184 | dev_refthread(struct cdev *dev, int *ref) |
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185 | { |
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186 | struct cdevsw *csw; |
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187 | struct cdev_priv *cdp; |
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188 | |
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189 | mtx_assert(&devmtx, MA_NOTOWNED); |
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190 | if ((dev->si_flags & SI_ETERNAL) != 0) { |
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191 | *ref = 0; |
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192 | return (dev->si_devsw); |
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193 | } |
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194 | dev_lock(); |
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195 | csw = dev->si_devsw; |
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196 | if (csw != NULL) { |
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197 | cdp = cdev2priv(dev); |
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198 | if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) |
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199 | dev->si_threadcount++; |
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200 | else |
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201 | csw = NULL; |
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202 | } |
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203 | dev_unlock(); |
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204 | *ref = 1; |
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205 | return (csw); |
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206 | } |
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207 | |
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208 | struct cdevsw * |
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209 | devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref) |
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210 | { |
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211 | struct cdevsw *csw; |
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212 | struct cdev_priv *cdp; |
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213 | struct cdev *dev; |
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214 | |
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215 | mtx_assert(&devmtx, MA_NOTOWNED); |
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216 | if ((vp->v_vflag & VV_ETERNALDEV) != 0) { |
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217 | dev = vp->v_rdev; |
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218 | if (dev == NULL) |
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219 | return (NULL); |
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220 | KASSERT((dev->si_flags & SI_ETERNAL) != 0, |
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221 | ("Not eternal cdev")); |
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222 | *ref = 0; |
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223 | csw = dev->si_devsw; |
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224 | KASSERT(csw != NULL, ("Eternal cdev is destroyed")); |
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225 | *devp = dev; |
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226 | return (csw); |
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227 | } |
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228 | |
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229 | csw = NULL; |
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230 | dev_lock(); |
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231 | dev = vp->v_rdev; |
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232 | if (dev == NULL) { |
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233 | dev_unlock(); |
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234 | return (NULL); |
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235 | } |
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236 | cdp = cdev2priv(dev); |
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237 | if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) { |
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238 | csw = dev->si_devsw; |
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239 | if (csw != NULL) |
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240 | dev->si_threadcount++; |
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241 | } |
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242 | dev_unlock(); |
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243 | if (csw != NULL) { |
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244 | *devp = dev; |
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245 | *ref = 1; |
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246 | } |
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247 | return (csw); |
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248 | } |
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249 | |
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250 | void |
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251 | dev_relthread(struct cdev *dev, int ref) |
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252 | { |
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253 | |
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254 | mtx_assert(&devmtx, MA_NOTOWNED); |
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255 | if (!ref) |
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256 | return; |
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257 | dev_lock(); |
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258 | KASSERT(dev->si_threadcount > 0, |
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259 | ("%s threadcount is wrong", dev->si_name)); |
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260 | dev->si_threadcount--; |
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261 | dev_unlock(); |
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262 | } |
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263 | |
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264 | int |
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265 | nullop(void) |
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266 | { |
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267 | |
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268 | return (0); |
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269 | } |
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270 | |
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271 | int |
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272 | eopnotsupp(void) |
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273 | { |
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274 | |
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275 | return (EOPNOTSUPP); |
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276 | } |
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277 | |
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278 | static int |
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279 | enxio(void) |
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280 | { |
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281 | return (ENXIO); |
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282 | } |
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283 | |
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284 | static int |
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285 | enodev(void) |
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286 | { |
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287 | return (ENODEV); |
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288 | } |
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289 | |
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290 | /* Define a dead_cdevsw for use when devices leave unexpectedly. */ |
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291 | |
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292 | #define dead_open (d_open_t *)enxio |
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293 | #define dead_close (d_close_t *)enxio |
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294 | #define dead_read (d_read_t *)enxio |
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295 | #define dead_write (d_write_t *)enxio |
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296 | #define dead_ioctl (d_ioctl_t *)enxio |
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297 | #define dead_poll (d_poll_t *)enodev |
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298 | #define dead_mmap (d_mmap_t *)enodev |
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299 | |
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300 | static void |
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301 | dead_strategy(struct bio *bp) |
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302 | { |
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303 | |
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304 | biofinish(bp, NULL, ENXIO); |
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305 | } |
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306 | |
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307 | #define dead_dump (dumper_t *)enxio |
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308 | #define dead_kqfilter (d_kqfilter_t *)enxio |
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309 | #define dead_mmap_single (d_mmap_single_t *)enodev |
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310 | |
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311 | static struct cdevsw dead_cdevsw = { |
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312 | .d_version = D_VERSION, |
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313 | .d_open = dead_open, |
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314 | .d_close = dead_close, |
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315 | .d_read = dead_read, |
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316 | .d_write = dead_write, |
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317 | .d_ioctl = dead_ioctl, |
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318 | .d_poll = dead_poll, |
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319 | .d_mmap = dead_mmap, |
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320 | .d_strategy = dead_strategy, |
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321 | .d_name = "dead", |
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322 | .d_dump = dead_dump, |
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323 | .d_kqfilter = dead_kqfilter, |
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324 | .d_mmap_single = dead_mmap_single |
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325 | }; |
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326 | |
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327 | /* Default methods if driver does not specify method */ |
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328 | |
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329 | #define null_open (d_open_t *)nullop |
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330 | #define null_close (d_close_t *)nullop |
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331 | #define no_read (d_read_t *)enodev |
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332 | #define no_write (d_write_t *)enodev |
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333 | #define no_ioctl (d_ioctl_t *)enodev |
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334 | #define no_mmap (d_mmap_t *)enodev |
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335 | #define no_kqfilter (d_kqfilter_t *)enodev |
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336 | #define no_mmap_single (d_mmap_single_t *)enodev |
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337 | |
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338 | static void |
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339 | no_strategy(struct bio *bp) |
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340 | { |
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341 | |
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342 | biofinish(bp, NULL, ENODEV); |
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343 | } |
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344 | |
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345 | static int |
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346 | no_poll(struct cdev *dev __unused, int events, struct thread *td __unused) |
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347 | { |
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348 | |
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349 | return (poll_no_poll(events)); |
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350 | } |
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351 | |
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352 | #define no_dump (dumper_t *)enodev |
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353 | |
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354 | static int |
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355 | giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td) |
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356 | { |
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357 | struct cdevsw *dsw; |
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358 | int ref, retval; |
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359 | |
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360 | dsw = dev_refthread(dev, &ref); |
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361 | if (dsw == NULL) |
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362 | return (ENXIO); |
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363 | mtx_lock(&Giant); |
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364 | retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td); |
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365 | mtx_unlock(&Giant); |
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366 | dev_relthread(dev, ref); |
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367 | return (retval); |
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368 | } |
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369 | |
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370 | static int |
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371 | giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp) |
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372 | { |
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373 | struct cdevsw *dsw; |
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374 | int ref, retval; |
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375 | |
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376 | dsw = dev_refthread(dev, &ref); |
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377 | if (dsw == NULL) |
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378 | return (ENXIO); |
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379 | mtx_lock(&Giant); |
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380 | retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp); |
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381 | mtx_unlock(&Giant); |
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382 | dev_relthread(dev, ref); |
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383 | return (retval); |
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384 | } |
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385 | |
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386 | static int |
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387 | giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td) |
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388 | { |
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389 | struct cdevsw *dsw; |
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390 | int ref, retval; |
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391 | |
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392 | dsw = dev_refthread(dev, &ref); |
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393 | if (dsw == NULL) |
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394 | return (ENXIO); |
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395 | mtx_lock(&Giant); |
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396 | retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td); |
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397 | mtx_unlock(&Giant); |
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398 | dev_relthread(dev, ref); |
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399 | return (retval); |
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400 | } |
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401 | |
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402 | static void |
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403 | giant_strategy(struct bio *bp) |
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404 | { |
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405 | struct cdevsw *dsw; |
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406 | struct cdev *dev; |
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407 | int ref; |
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408 | |
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409 | dev = bp->bio_dev; |
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410 | dsw = dev_refthread(dev, &ref); |
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411 | if (dsw == NULL) { |
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412 | biofinish(bp, NULL, ENXIO); |
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413 | return; |
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414 | } |
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415 | mtx_lock(&Giant); |
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416 | dsw->d_gianttrick->d_strategy(bp); |
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417 | mtx_unlock(&Giant); |
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418 | dev_relthread(dev, ref); |
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419 | } |
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420 | |
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421 | static int |
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422 | giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) |
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423 | { |
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424 | struct cdevsw *dsw; |
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425 | int ref, retval; |
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426 | |
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427 | dsw = dev_refthread(dev, &ref); |
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428 | if (dsw == NULL) |
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429 | return (ENXIO); |
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430 | mtx_lock(&Giant); |
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431 | retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td); |
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432 | mtx_unlock(&Giant); |
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433 | dev_relthread(dev, ref); |
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434 | return (retval); |
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435 | } |
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436 | |
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437 | static int |
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438 | giant_read(struct cdev *dev, struct uio *uio, int ioflag) |
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439 | { |
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440 | struct cdevsw *dsw; |
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441 | int ref, retval; |
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442 | |
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443 | dsw = dev_refthread(dev, &ref); |
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444 | if (dsw == NULL) |
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445 | return (ENXIO); |
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446 | mtx_lock(&Giant); |
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447 | retval = dsw->d_gianttrick->d_read(dev, uio, ioflag); |
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448 | mtx_unlock(&Giant); |
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449 | dev_relthread(dev, ref); |
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450 | return (retval); |
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451 | } |
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452 | |
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453 | static int |
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454 | giant_write(struct cdev *dev, struct uio *uio, int ioflag) |
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455 | { |
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456 | struct cdevsw *dsw; |
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457 | int ref, retval; |
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458 | |
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459 | dsw = dev_refthread(dev, &ref); |
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460 | if (dsw == NULL) |
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461 | return (ENXIO); |
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462 | mtx_lock(&Giant); |
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463 | retval = dsw->d_gianttrick->d_write(dev, uio, ioflag); |
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464 | mtx_unlock(&Giant); |
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465 | dev_relthread(dev, ref); |
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466 | return (retval); |
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467 | } |
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468 | |
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469 | static int |
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470 | giant_poll(struct cdev *dev, int events, struct thread *td) |
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471 | { |
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472 | struct cdevsw *dsw; |
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473 | int ref, retval; |
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474 | |
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475 | dsw = dev_refthread(dev, &ref); |
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476 | if (dsw == NULL) |
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477 | return (ENXIO); |
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478 | mtx_lock(&Giant); |
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479 | retval = dsw->d_gianttrick->d_poll(dev, events, td); |
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480 | mtx_unlock(&Giant); |
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481 | dev_relthread(dev, ref); |
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482 | return (retval); |
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483 | } |
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484 | |
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485 | static int |
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486 | giant_kqfilter(struct cdev *dev, struct knote *kn) |
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487 | { |
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488 | struct cdevsw *dsw; |
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489 | int ref, retval; |
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490 | |
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491 | dsw = dev_refthread(dev, &ref); |
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492 | if (dsw == NULL) |
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493 | return (ENXIO); |
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494 | mtx_lock(&Giant); |
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495 | retval = dsw->d_gianttrick->d_kqfilter(dev, kn); |
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496 | mtx_unlock(&Giant); |
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497 | dev_relthread(dev, ref); |
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498 | return (retval); |
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499 | } |
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500 | |
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501 | static int |
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502 | giant_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot, |
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503 | vm_memattr_t *memattr) |
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504 | { |
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505 | struct cdevsw *dsw; |
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506 | int ref, retval; |
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507 | |
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508 | dsw = dev_refthread(dev, &ref); |
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509 | if (dsw == NULL) |
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510 | return (ENXIO); |
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511 | mtx_lock(&Giant); |
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512 | retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot, |
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513 | memattr); |
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514 | mtx_unlock(&Giant); |
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515 | dev_relthread(dev, ref); |
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516 | return (retval); |
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517 | } |
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518 | |
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519 | static int |
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520 | giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size, |
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521 | vm_object_t *object, int nprot) |
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522 | { |
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523 | struct cdevsw *dsw; |
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524 | int ref, retval; |
---|
525 | |
---|
526 | dsw = dev_refthread(dev, &ref); |
---|
527 | if (dsw == NULL) |
---|
528 | return (ENXIO); |
---|
529 | mtx_lock(&Giant); |
---|
530 | retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object, |
---|
531 | nprot); |
---|
532 | mtx_unlock(&Giant); |
---|
533 | dev_relthread(dev, ref); |
---|
534 | return (retval); |
---|
535 | } |
---|
536 | |
---|
537 | static void |
---|
538 | notify(struct cdev *dev, const char *ev, int flags) |
---|
539 | { |
---|
540 | static const char prefix[] = "cdev="; |
---|
541 | char *data; |
---|
542 | int namelen, mflags; |
---|
543 | |
---|
544 | if (cold) |
---|
545 | return; |
---|
546 | mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; |
---|
547 | namelen = strlen(dev->si_name); |
---|
548 | data = malloc(namelen + sizeof(prefix), M_TEMP, mflags); |
---|
549 | if (data == NULL) |
---|
550 | return; |
---|
551 | memcpy(data, prefix, sizeof(prefix) - 1); |
---|
552 | memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1); |
---|
553 | devctl_notify_f("DEVFS", "CDEV", ev, data, mflags); |
---|
554 | free(data, M_TEMP); |
---|
555 | } |
---|
556 | |
---|
557 | static void |
---|
558 | notify_create(struct cdev *dev, int flags) |
---|
559 | { |
---|
560 | |
---|
561 | notify(dev, "CREATE", flags); |
---|
562 | } |
---|
563 | |
---|
564 | static void |
---|
565 | notify_destroy(struct cdev *dev) |
---|
566 | { |
---|
567 | |
---|
568 | notify(dev, "DESTROY", MAKEDEV_WAITOK); |
---|
569 | } |
---|
570 | |
---|
571 | static struct cdev * |
---|
572 | newdev(struct cdevsw *csw, int unit, struct cdev *si) |
---|
573 | { |
---|
574 | struct cdev *si2; |
---|
575 | |
---|
576 | mtx_assert(&devmtx, MA_OWNED); |
---|
577 | if (csw->d_flags & D_NEEDMINOR) { |
---|
578 | /* We may want to return an existing device */ |
---|
579 | LIST_FOREACH(si2, &csw->d_devs, si_list) { |
---|
580 | if (dev2unit(si2) == unit) { |
---|
581 | dev_free_devlocked(si); |
---|
582 | return (si2); |
---|
583 | } |
---|
584 | } |
---|
585 | } |
---|
586 | si->si_drv0 = unit; |
---|
587 | si->si_devsw = csw; |
---|
588 | LIST_INSERT_HEAD(&csw->d_devs, si, si_list); |
---|
589 | return (si); |
---|
590 | } |
---|
591 | |
---|
592 | static void |
---|
593 | fini_cdevsw(struct cdevsw *devsw) |
---|
594 | { |
---|
595 | struct cdevsw *gt; |
---|
596 | |
---|
597 | if (devsw->d_gianttrick != NULL) { |
---|
598 | gt = devsw->d_gianttrick; |
---|
599 | memcpy(devsw, gt, sizeof *devsw); |
---|
600 | cdevsw_free_devlocked(gt); |
---|
601 | devsw->d_gianttrick = NULL; |
---|
602 | } |
---|
603 | devsw->d_flags &= ~D_INIT; |
---|
604 | } |
---|
605 | |
---|
606 | static int |
---|
607 | prep_cdevsw(struct cdevsw *devsw, int flags) |
---|
608 | { |
---|
609 | struct cdevsw *dsw2; |
---|
610 | |
---|
611 | mtx_assert(&devmtx, MA_OWNED); |
---|
612 | if (devsw->d_flags & D_INIT) |
---|
613 | return (0); |
---|
614 | if (devsw->d_flags & D_NEEDGIANT) { |
---|
615 | dev_unlock(); |
---|
616 | dsw2 = malloc(sizeof *dsw2, M_DEVT, |
---|
617 | (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK); |
---|
618 | dev_lock(); |
---|
619 | if (dsw2 == NULL && !(devsw->d_flags & D_INIT)) |
---|
620 | return (ENOMEM); |
---|
621 | } else |
---|
622 | dsw2 = NULL; |
---|
623 | if (devsw->d_flags & D_INIT) { |
---|
624 | if (dsw2 != NULL) |
---|
625 | cdevsw_free_devlocked(dsw2); |
---|
626 | return (0); |
---|
627 | } |
---|
628 | |
---|
629 | if (devsw->d_version != D_VERSION_03) { |
---|
630 | printf( |
---|
631 | "WARNING: Device driver \"%s\" has wrong version %s\n", |
---|
632 | devsw->d_name == NULL ? "???" : devsw->d_name, |
---|
633 | "and is disabled. Recompile KLD module."); |
---|
634 | devsw->d_open = dead_open; |
---|
635 | devsw->d_close = dead_close; |
---|
636 | devsw->d_read = dead_read; |
---|
637 | devsw->d_write = dead_write; |
---|
638 | devsw->d_ioctl = dead_ioctl; |
---|
639 | devsw->d_poll = dead_poll; |
---|
640 | devsw->d_mmap = dead_mmap; |
---|
641 | devsw->d_mmap_single = dead_mmap_single; |
---|
642 | devsw->d_strategy = dead_strategy; |
---|
643 | devsw->d_dump = dead_dump; |
---|
644 | devsw->d_kqfilter = dead_kqfilter; |
---|
645 | } |
---|
646 | |
---|
647 | if (devsw->d_flags & D_NEEDGIANT) { |
---|
648 | if (devsw->d_gianttrick == NULL) { |
---|
649 | memcpy(dsw2, devsw, sizeof *dsw2); |
---|
650 | devsw->d_gianttrick = dsw2; |
---|
651 | dsw2 = NULL; |
---|
652 | } |
---|
653 | } |
---|
654 | |
---|
655 | #define FIXUP(member, noop, giant) \ |
---|
656 | do { \ |
---|
657 | if (devsw->member == NULL) { \ |
---|
658 | devsw->member = noop; \ |
---|
659 | } else if (devsw->d_flags & D_NEEDGIANT) \ |
---|
660 | devsw->member = giant; \ |
---|
661 | } \ |
---|
662 | while (0) |
---|
663 | |
---|
664 | FIXUP(d_open, null_open, giant_open); |
---|
665 | FIXUP(d_fdopen, NULL, giant_fdopen); |
---|
666 | FIXUP(d_close, null_close, giant_close); |
---|
667 | FIXUP(d_read, no_read, giant_read); |
---|
668 | FIXUP(d_write, no_write, giant_write); |
---|
669 | FIXUP(d_ioctl, no_ioctl, giant_ioctl); |
---|
670 | FIXUP(d_poll, no_poll, giant_poll); |
---|
671 | FIXUP(d_mmap, no_mmap, giant_mmap); |
---|
672 | FIXUP(d_strategy, no_strategy, giant_strategy); |
---|
673 | FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter); |
---|
674 | FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single); |
---|
675 | |
---|
676 | if (devsw->d_dump == NULL) devsw->d_dump = no_dump; |
---|
677 | |
---|
678 | LIST_INIT(&devsw->d_devs); |
---|
679 | |
---|
680 | devsw->d_flags |= D_INIT; |
---|
681 | |
---|
682 | if (dsw2 != NULL) |
---|
683 | cdevsw_free_devlocked(dsw2); |
---|
684 | return (0); |
---|
685 | } |
---|
686 | |
---|
687 | static int |
---|
688 | prep_devname(struct cdev *dev, const char *fmt, va_list ap) |
---|
689 | { |
---|
690 | int len; |
---|
691 | char *from, *q, *s, *to; |
---|
692 | |
---|
693 | mtx_assert(&devmtx, MA_OWNED); |
---|
694 | |
---|
695 | len = vsnrprintf(dev->__si_namebuf, sizeof(dev->__si_namebuf), 32, |
---|
696 | fmt, ap); |
---|
697 | if (len > sizeof(dev->__si_namebuf) - 1) |
---|
698 | return (ENAMETOOLONG); |
---|
699 | |
---|
700 | /* Strip leading slashes. */ |
---|
701 | for (from = dev->__si_namebuf; *from == '/'; from++) |
---|
702 | ; |
---|
703 | |
---|
704 | for (to = dev->__si_namebuf; *from != '\0'; from++, to++) { |
---|
705 | /* Treat multiple sequential slashes as single. */ |
---|
706 | while (from[0] == '/' && from[1] == '/') |
---|
707 | from++; |
---|
708 | /* Trailing slash is considered invalid. */ |
---|
709 | if (from[0] == '/' && from[1] == '\0') |
---|
710 | return (EINVAL); |
---|
711 | *to = *from; |
---|
712 | } |
---|
713 | *to = '\0'; |
---|
714 | |
---|
715 | if (dev->__si_namebuf[0] == '\0') |
---|
716 | return (EINVAL); |
---|
717 | |
---|
718 | /* Disallow "." and ".." components. */ |
---|
719 | for (s = dev->__si_namebuf;;) { |
---|
720 | for (q = s; *q != '/' && *q != '\0'; q++) |
---|
721 | ; |
---|
722 | if (q - s == 1 && s[0] == '.') |
---|
723 | return (EINVAL); |
---|
724 | if (q - s == 2 && s[0] == '.' && s[1] == '.') |
---|
725 | return (EINVAL); |
---|
726 | if (*q != '/') |
---|
727 | break; |
---|
728 | s = q + 1; |
---|
729 | } |
---|
730 | |
---|
731 | if (devfs_dev_exists(dev->__si_namebuf) != 0) |
---|
732 | return (EEXIST); |
---|
733 | |
---|
734 | return (0); |
---|
735 | } |
---|
736 | |
---|
737 | static int |
---|
738 | make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit, |
---|
739 | struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, |
---|
740 | va_list ap) |
---|
741 | { |
---|
742 | struct cdev *dev, *dev_new; |
---|
743 | int res; |
---|
744 | |
---|
745 | KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, |
---|
746 | ("make_dev_credv: both WAITOK and NOWAIT specified")); |
---|
747 | dev_new = devfs_alloc(flags); |
---|
748 | if (dev_new == NULL) |
---|
749 | return (ENOMEM); |
---|
750 | dev_lock(); |
---|
751 | res = prep_cdevsw(devsw, flags); |
---|
752 | if (res != 0) { |
---|
753 | dev_unlock(); |
---|
754 | devfs_free(dev_new); |
---|
755 | return (res); |
---|
756 | } |
---|
757 | dev = newdev(devsw, unit, dev_new); |
---|
758 | if ((dev->si_flags & SI_NAMED) == 0) { |
---|
759 | res = prep_devname(dev, fmt, ap); |
---|
760 | if (res != 0) { |
---|
761 | if ((flags & MAKEDEV_CHECKNAME) == 0) { |
---|
762 | panic( |
---|
763 | "make_dev_credv: bad si_name (error=%d, si_name=%s)", |
---|
764 | res, dev->si_name); |
---|
765 | } |
---|
766 | if (dev == dev_new) { |
---|
767 | LIST_REMOVE(dev, si_list); |
---|
768 | dev_unlock(); |
---|
769 | devfs_free(dev); |
---|
770 | } else |
---|
771 | dev_unlock(); |
---|
772 | return (res); |
---|
773 | } |
---|
774 | } |
---|
775 | if (flags & MAKEDEV_REF) |
---|
776 | dev_refl(dev); |
---|
777 | if (flags & MAKEDEV_ETERNAL) |
---|
778 | dev->si_flags |= SI_ETERNAL; |
---|
779 | if (dev->si_flags & SI_CHEAPCLONE && |
---|
780 | dev->si_flags & SI_NAMED) { |
---|
781 | /* |
---|
782 | * This is allowed as it removes races and generally |
---|
783 | * simplifies cloning devices. |
---|
784 | * XXX: still ?? |
---|
785 | */ |
---|
786 | dev_unlock_and_free(); |
---|
787 | *dres = dev; |
---|
788 | return (0); |
---|
789 | } |
---|
790 | KASSERT(!(dev->si_flags & SI_NAMED), |
---|
791 | ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", |
---|
792 | devsw->d_name, dev2unit(dev), devtoname(dev))); |
---|
793 | dev->si_flags |= SI_NAMED; |
---|
794 | if (cr != NULL) |
---|
795 | dev->si_cred = crhold(cr); |
---|
796 | dev->si_uid = uid; |
---|
797 | dev->si_gid = gid; |
---|
798 | dev->si_mode = mode; |
---|
799 | |
---|
800 | devfs_create(dev); |
---|
801 | clean_unrhdrl(devfs_inos); |
---|
802 | dev_unlock_and_free(); |
---|
803 | |
---|
804 | notify_create(dev, flags); |
---|
805 | |
---|
806 | *dres = dev; |
---|
807 | return (0); |
---|
808 | } |
---|
809 | |
---|
810 | struct cdev * |
---|
811 | make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode, |
---|
812 | const char *fmt, ...) |
---|
813 | { |
---|
814 | struct cdev *dev; |
---|
815 | va_list ap; |
---|
816 | int res; |
---|
817 | |
---|
818 | va_start(ap, fmt); |
---|
819 | res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt, |
---|
820 | ap); |
---|
821 | va_end(ap); |
---|
822 | KASSERT(res == 0 && dev != NULL, |
---|
823 | ("make_dev: failed make_dev_credv (error=%d)", res)); |
---|
824 | return (dev); |
---|
825 | } |
---|
826 | |
---|
827 | struct cdev * |
---|
828 | make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid, |
---|
829 | gid_t gid, int mode, const char *fmt, ...) |
---|
830 | { |
---|
831 | struct cdev *dev; |
---|
832 | va_list ap; |
---|
833 | int res; |
---|
834 | |
---|
835 | va_start(ap, fmt); |
---|
836 | res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap); |
---|
837 | va_end(ap); |
---|
838 | |
---|
839 | KASSERT(res == 0 && dev != NULL, |
---|
840 | ("make_dev_cred: failed make_dev_credv (error=%d)", res)); |
---|
841 | return (dev); |
---|
842 | } |
---|
843 | |
---|
844 | struct cdev * |
---|
845 | make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr, |
---|
846 | uid_t uid, gid_t gid, int mode, const char *fmt, ...) |
---|
847 | { |
---|
848 | struct cdev *dev; |
---|
849 | va_list ap; |
---|
850 | int res; |
---|
851 | |
---|
852 | va_start(ap, fmt); |
---|
853 | res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode, |
---|
854 | fmt, ap); |
---|
855 | va_end(ap); |
---|
856 | |
---|
857 | KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || |
---|
858 | ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, |
---|
859 | ("make_dev_credf: failed make_dev_credv (error=%d)", res)); |
---|
860 | return (res == 0 ? dev : NULL); |
---|
861 | } |
---|
862 | |
---|
863 | int |
---|
864 | make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw, |
---|
865 | struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...) |
---|
866 | { |
---|
867 | va_list ap; |
---|
868 | int res; |
---|
869 | |
---|
870 | va_start(ap, fmt); |
---|
871 | res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode, |
---|
872 | fmt, ap); |
---|
873 | va_end(ap); |
---|
874 | |
---|
875 | KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || |
---|
876 | ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, |
---|
877 | ("make_dev_p: failed make_dev_credv (error=%d)", res)); |
---|
878 | return (res); |
---|
879 | } |
---|
880 | |
---|
881 | static void |
---|
882 | dev_dependsl(struct cdev *pdev, struct cdev *cdev) |
---|
883 | { |
---|
884 | |
---|
885 | cdev->si_parent = pdev; |
---|
886 | cdev->si_flags |= SI_CHILD; |
---|
887 | LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); |
---|
888 | } |
---|
889 | |
---|
890 | |
---|
891 | void |
---|
892 | dev_depends(struct cdev *pdev, struct cdev *cdev) |
---|
893 | { |
---|
894 | |
---|
895 | dev_lock(); |
---|
896 | dev_dependsl(pdev, cdev); |
---|
897 | dev_unlock(); |
---|
898 | } |
---|
899 | |
---|
900 | static int |
---|
901 | make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev, |
---|
902 | const char *fmt, va_list ap) |
---|
903 | { |
---|
904 | struct cdev *dev; |
---|
905 | int error; |
---|
906 | |
---|
907 | KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL")); |
---|
908 | KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, |
---|
909 | ("make_dev_alias_v: both WAITOK and NOWAIT specified")); |
---|
910 | KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT | |
---|
911 | MAKEDEV_CHECKNAME)) == 0, |
---|
912 | ("make_dev_alias_v: invalid flags specified (flags=%02x)", flags)); |
---|
913 | |
---|
914 | dev = devfs_alloc(flags); |
---|
915 | if (dev == NULL) |
---|
916 | return (ENOMEM); |
---|
917 | dev_lock(); |
---|
918 | dev->si_flags |= SI_ALIAS; |
---|
919 | error = prep_devname(dev, fmt, ap); |
---|
920 | if (error != 0) { |
---|
921 | if ((flags & MAKEDEV_CHECKNAME) == 0) { |
---|
922 | panic("make_dev_alias_v: bad si_name " |
---|
923 | "(error=%d, si_name=%s)", error, dev->si_name); |
---|
924 | } |
---|
925 | dev_unlock(); |
---|
926 | devfs_free(dev); |
---|
927 | return (error); |
---|
928 | } |
---|
929 | dev->si_flags |= SI_NAMED; |
---|
930 | devfs_create(dev); |
---|
931 | dev_dependsl(pdev, dev); |
---|
932 | clean_unrhdrl(devfs_inos); |
---|
933 | dev_unlock(); |
---|
934 | |
---|
935 | notify_create(dev, flags); |
---|
936 | *cdev = dev; |
---|
937 | |
---|
938 | return (0); |
---|
939 | } |
---|
940 | |
---|
941 | struct cdev * |
---|
942 | make_dev_alias(struct cdev *pdev, const char *fmt, ...) |
---|
943 | { |
---|
944 | struct cdev *dev; |
---|
945 | va_list ap; |
---|
946 | int res; |
---|
947 | |
---|
948 | va_start(ap, fmt); |
---|
949 | res = make_dev_alias_v(MAKEDEV_WAITOK, &dev, pdev, fmt, ap); |
---|
950 | va_end(ap); |
---|
951 | |
---|
952 | KASSERT(res == 0 && dev != NULL, |
---|
953 | ("make_dev_alias: failed make_dev_alias_v (error=%d)", res)); |
---|
954 | return (dev); |
---|
955 | } |
---|
956 | |
---|
957 | int |
---|
958 | make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev, |
---|
959 | const char *fmt, ...) |
---|
960 | { |
---|
961 | va_list ap; |
---|
962 | int res; |
---|
963 | |
---|
964 | va_start(ap, fmt); |
---|
965 | res = make_dev_alias_v(flags, cdev, pdev, fmt, ap); |
---|
966 | va_end(ap); |
---|
967 | return (res); |
---|
968 | } |
---|
969 | |
---|
970 | int |
---|
971 | make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev, |
---|
972 | struct cdev *old_alias, const char *physpath) |
---|
973 | { |
---|
974 | char *devfspath; |
---|
975 | int physpath_len; |
---|
976 | int max_parentpath_len; |
---|
977 | int parentpath_len; |
---|
978 | int devfspathbuf_len; |
---|
979 | int mflags; |
---|
980 | int ret; |
---|
981 | |
---|
982 | *cdev = NULL; |
---|
983 | devfspath = NULL; |
---|
984 | physpath_len = strlen(physpath); |
---|
985 | ret = EINVAL; |
---|
986 | if (physpath_len == 0) |
---|
987 | goto out; |
---|
988 | |
---|
989 | if (strncmp("id1,", physpath, 4) == 0) { |
---|
990 | physpath += 4; |
---|
991 | physpath_len -= 4; |
---|
992 | if (physpath_len == 0) |
---|
993 | goto out; |
---|
994 | } |
---|
995 | |
---|
996 | max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1; |
---|
997 | parentpath_len = strlen(pdev->si_name); |
---|
998 | if (max_parentpath_len < parentpath_len) { |
---|
999 | if (bootverbose) |
---|
1000 | printf("WARNING: Unable to alias %s " |
---|
1001 | "to %s/%s - path too long\n", |
---|
1002 | pdev->si_name, physpath, pdev->si_name); |
---|
1003 | ret = ENAMETOOLONG; |
---|
1004 | goto out; |
---|
1005 | } |
---|
1006 | |
---|
1007 | mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; |
---|
1008 | devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1; |
---|
1009 | devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags); |
---|
1010 | if (devfspath == NULL) { |
---|
1011 | ret = ENOMEM; |
---|
1012 | goto out; |
---|
1013 | } |
---|
1014 | |
---|
1015 | sprintf(devfspath, "%s/%s", physpath, pdev->si_name); |
---|
1016 | if (old_alias != NULL && strcmp(old_alias->si_name, devfspath) == 0) { |
---|
1017 | /* Retain the existing alias. */ |
---|
1018 | *cdev = old_alias; |
---|
1019 | old_alias = NULL; |
---|
1020 | ret = 0; |
---|
1021 | } else { |
---|
1022 | ret = make_dev_alias_p(flags, cdev, pdev, "%s", devfspath); |
---|
1023 | } |
---|
1024 | out: |
---|
1025 | if (old_alias != NULL) |
---|
1026 | destroy_dev(old_alias); |
---|
1027 | if (devfspath != NULL) |
---|
1028 | free(devfspath, M_DEVBUF); |
---|
1029 | return (ret); |
---|
1030 | } |
---|
1031 | |
---|
1032 | static void |
---|
1033 | destroy_devl(struct cdev *dev) |
---|
1034 | { |
---|
1035 | struct cdevsw *csw; |
---|
1036 | struct cdev_privdata *p; |
---|
1037 | struct cdev_priv *cdp; |
---|
1038 | |
---|
1039 | mtx_assert(&devmtx, MA_OWNED); |
---|
1040 | KASSERT(dev->si_flags & SI_NAMED, |
---|
1041 | ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev))); |
---|
1042 | KASSERT((dev->si_flags & SI_ETERNAL) == 0, |
---|
1043 | ("WARNING: Driver mistake: destroy_dev on eternal %d\n", |
---|
1044 | dev2unit(dev))); |
---|
1045 | |
---|
1046 | cdp = cdev2priv(dev); |
---|
1047 | if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) { |
---|
1048 | /* |
---|
1049 | * Avoid race with dev_rel(), e.g. from the populate |
---|
1050 | * loop. If CDP_UNREF_DTR flag is set, the reference |
---|
1051 | * to be dropped at the end of destroy_devl() was |
---|
1052 | * already taken by delist_dev_locked(). |
---|
1053 | */ |
---|
1054 | dev_refl(dev); |
---|
1055 | |
---|
1056 | devfs_destroy(dev); |
---|
1057 | } |
---|
1058 | |
---|
1059 | /* Remove name marking */ |
---|
1060 | dev->si_flags &= ~SI_NAMED; |
---|
1061 | |
---|
1062 | /* If we are a child, remove us from the parents list */ |
---|
1063 | if (dev->si_flags & SI_CHILD) { |
---|
1064 | LIST_REMOVE(dev, si_siblings); |
---|
1065 | dev->si_flags &= ~SI_CHILD; |
---|
1066 | } |
---|
1067 | |
---|
1068 | /* Kill our children */ |
---|
1069 | while (!LIST_EMPTY(&dev->si_children)) |
---|
1070 | destroy_devl(LIST_FIRST(&dev->si_children)); |
---|
1071 | |
---|
1072 | /* Remove from clone list */ |
---|
1073 | if (dev->si_flags & SI_CLONELIST) { |
---|
1074 | LIST_REMOVE(dev, si_clone); |
---|
1075 | dev->si_flags &= ~SI_CLONELIST; |
---|
1076 | } |
---|
1077 | |
---|
1078 | csw = dev->si_devsw; |
---|
1079 | dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ |
---|
1080 | while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { |
---|
1081 | csw->d_purge(dev); |
---|
1082 | msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); |
---|
1083 | if (dev->si_threadcount) |
---|
1084 | printf("Still %lu threads in %s\n", |
---|
1085 | dev->si_threadcount, devtoname(dev)); |
---|
1086 | } |
---|
1087 | while (dev->si_threadcount != 0) { |
---|
1088 | /* Use unique dummy wait ident */ |
---|
1089 | msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10); |
---|
1090 | } |
---|
1091 | |
---|
1092 | dev_unlock(); |
---|
1093 | if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) { |
---|
1094 | /* avoid out of order notify events */ |
---|
1095 | notify_destroy(dev); |
---|
1096 | } |
---|
1097 | mtx_lock(&cdevpriv_mtx); |
---|
1098 | while ((p = LIST_FIRST(&cdp->cdp_fdpriv)) != NULL) { |
---|
1099 | devfs_destroy_cdevpriv(p); |
---|
1100 | mtx_lock(&cdevpriv_mtx); |
---|
1101 | } |
---|
1102 | mtx_unlock(&cdevpriv_mtx); |
---|
1103 | dev_lock(); |
---|
1104 | |
---|
1105 | dev->si_drv1 = 0; |
---|
1106 | dev->si_drv2 = 0; |
---|
1107 | bzero(&dev->__si_u, sizeof(dev->__si_u)); |
---|
1108 | |
---|
1109 | if (!(dev->si_flags & SI_ALIAS)) { |
---|
1110 | /* Remove from cdevsw list */ |
---|
1111 | LIST_REMOVE(dev, si_list); |
---|
1112 | |
---|
1113 | /* If cdevsw has no more struct cdev *'s, clean it */ |
---|
1114 | if (LIST_EMPTY(&csw->d_devs)) { |
---|
1115 | fini_cdevsw(csw); |
---|
1116 | wakeup(&csw->d_devs); |
---|
1117 | } |
---|
1118 | } |
---|
1119 | dev->si_flags &= ~SI_ALIAS; |
---|
1120 | cdp->cdp_flags &= ~CDP_UNREF_DTR; |
---|
1121 | dev->si_refcount--; |
---|
1122 | |
---|
1123 | if (dev->si_refcount > 0) |
---|
1124 | LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); |
---|
1125 | else |
---|
1126 | dev_free_devlocked(dev); |
---|
1127 | } |
---|
1128 | |
---|
1129 | static void |
---|
1130 | delist_dev_locked(struct cdev *dev) |
---|
1131 | { |
---|
1132 | struct cdev_priv *cdp; |
---|
1133 | struct cdev *child; |
---|
1134 | |
---|
1135 | mtx_assert(&devmtx, MA_OWNED); |
---|
1136 | cdp = cdev2priv(dev); |
---|
1137 | if ((cdp->cdp_flags & CDP_UNREF_DTR) != 0) |
---|
1138 | return; |
---|
1139 | cdp->cdp_flags |= CDP_UNREF_DTR; |
---|
1140 | dev_refl(dev); |
---|
1141 | devfs_destroy(dev); |
---|
1142 | LIST_FOREACH(child, &dev->si_children, si_siblings) |
---|
1143 | delist_dev_locked(child); |
---|
1144 | dev_unlock(); |
---|
1145 | /* ensure the destroy event is queued in order */ |
---|
1146 | notify_destroy(dev); |
---|
1147 | dev_lock(); |
---|
1148 | } |
---|
1149 | |
---|
1150 | /* |
---|
1151 | * This function will delist a character device and its children from |
---|
1152 | * the directory listing and create a destroy event without waiting |
---|
1153 | * for all character device references to go away. At some later point |
---|
1154 | * destroy_dev() must be called to complete the character device |
---|
1155 | * destruction. After calling this function the character device name |
---|
1156 | * can instantly be re-used. |
---|
1157 | */ |
---|
1158 | void |
---|
1159 | delist_dev(struct cdev *dev) |
---|
1160 | { |
---|
1161 | |
---|
1162 | WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "delist_dev"); |
---|
1163 | dev_lock(); |
---|
1164 | delist_dev_locked(dev); |
---|
1165 | dev_unlock(); |
---|
1166 | } |
---|
1167 | |
---|
1168 | void |
---|
1169 | destroy_dev(struct cdev *dev) |
---|
1170 | { |
---|
1171 | |
---|
1172 | WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev"); |
---|
1173 | dev_lock(); |
---|
1174 | destroy_devl(dev); |
---|
1175 | dev_unlock_and_free(); |
---|
1176 | } |
---|
1177 | |
---|
1178 | const char * |
---|
1179 | devtoname(struct cdev *dev) |
---|
1180 | { |
---|
1181 | |
---|
1182 | return (dev->si_name); |
---|
1183 | } |
---|
1184 | |
---|
1185 | int |
---|
1186 | dev_stdclone(char *name, char **namep, const char *stem, int *unit) |
---|
1187 | { |
---|
1188 | int u, i; |
---|
1189 | |
---|
1190 | i = strlen(stem); |
---|
1191 | if (bcmp(stem, name, i) != 0) |
---|
1192 | return (0); |
---|
1193 | if (!isdigit(name[i])) |
---|
1194 | return (0); |
---|
1195 | u = 0; |
---|
1196 | if (name[i] == '0' && isdigit(name[i+1])) |
---|
1197 | return (0); |
---|
1198 | while (isdigit(name[i])) { |
---|
1199 | u *= 10; |
---|
1200 | u += name[i++] - '0'; |
---|
1201 | } |
---|
1202 | if (u > 0xffffff) |
---|
1203 | return (0); |
---|
1204 | *unit = u; |
---|
1205 | if (namep) |
---|
1206 | *namep = &name[i]; |
---|
1207 | if (name[i]) |
---|
1208 | return (2); |
---|
1209 | return (1); |
---|
1210 | } |
---|
1211 | |
---|
1212 | /* |
---|
1213 | * Helper functions for cloning device drivers. |
---|
1214 | * |
---|
1215 | * The objective here is to make it unnecessary for the device drivers to |
---|
1216 | * use rman or similar to manage their unit number space. Due to the way |
---|
1217 | * we do "on-demand" devices, using rman or other "private" methods |
---|
1218 | * will be very tricky to lock down properly once we lock down this file. |
---|
1219 | * |
---|
1220 | * Instead we give the drivers these routines which puts the struct cdev *'s |
---|
1221 | * that are to be managed on their own list, and gives the driver the ability |
---|
1222 | * to ask for the first free unit number or a given specified unit number. |
---|
1223 | * |
---|
1224 | * In addition these routines support paired devices (pty, nmdm and similar) |
---|
1225 | * by respecting a number of "flag" bits in the minor number. |
---|
1226 | * |
---|
1227 | */ |
---|
1228 | |
---|
1229 | struct clonedevs { |
---|
1230 | LIST_HEAD(,cdev) head; |
---|
1231 | }; |
---|
1232 | |
---|
1233 | void |
---|
1234 | clone_setup(struct clonedevs **cdp) |
---|
1235 | { |
---|
1236 | |
---|
1237 | *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); |
---|
1238 | LIST_INIT(&(*cdp)->head); |
---|
1239 | } |
---|
1240 | |
---|
1241 | int |
---|
1242 | clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, |
---|
1243 | struct cdev **dp, int extra) |
---|
1244 | { |
---|
1245 | struct clonedevs *cd; |
---|
1246 | struct cdev *dev, *ndev, *dl, *de; |
---|
1247 | int unit, low, u; |
---|
1248 | |
---|
1249 | KASSERT(*cdp != NULL, |
---|
1250 | ("clone_setup() not called in driver \"%s\"", csw->d_name)); |
---|
1251 | KASSERT(!(extra & CLONE_UNITMASK), |
---|
1252 | ("Illegal extra bits (0x%x) in clone_create", extra)); |
---|
1253 | KASSERT(*up <= CLONE_UNITMASK, |
---|
1254 | ("Too high unit (0x%x) in clone_create", *up)); |
---|
1255 | KASSERT(csw->d_flags & D_NEEDMINOR, |
---|
1256 | ("clone_create() on cdevsw without minor numbers")); |
---|
1257 | |
---|
1258 | |
---|
1259 | /* |
---|
1260 | * Search the list for a lot of things in one go: |
---|
1261 | * A preexisting match is returned immediately. |
---|
1262 | * The lowest free unit number if we are passed -1, and the place |
---|
1263 | * in the list where we should insert that new element. |
---|
1264 | * The place to insert a specified unit number, if applicable |
---|
1265 | * the end of the list. |
---|
1266 | */ |
---|
1267 | unit = *up; |
---|
1268 | ndev = devfs_alloc(MAKEDEV_WAITOK); |
---|
1269 | dev_lock(); |
---|
1270 | prep_cdevsw(csw, MAKEDEV_WAITOK); |
---|
1271 | low = extra; |
---|
1272 | de = dl = NULL; |
---|
1273 | cd = *cdp; |
---|
1274 | LIST_FOREACH(dev, &cd->head, si_clone) { |
---|
1275 | KASSERT(dev->si_flags & SI_CLONELIST, |
---|
1276 | ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); |
---|
1277 | u = dev2unit(dev); |
---|
1278 | if (u == (unit | extra)) { |
---|
1279 | *dp = dev; |
---|
1280 | dev_unlock(); |
---|
1281 | devfs_free(ndev); |
---|
1282 | return (0); |
---|
1283 | } |
---|
1284 | if (unit == -1 && u == low) { |
---|
1285 | low++; |
---|
1286 | de = dev; |
---|
1287 | continue; |
---|
1288 | } else if (u < (unit | extra)) { |
---|
1289 | de = dev; |
---|
1290 | continue; |
---|
1291 | } else if (u > (unit | extra)) { |
---|
1292 | dl = dev; |
---|
1293 | break; |
---|
1294 | } |
---|
1295 | } |
---|
1296 | if (unit == -1) |
---|
1297 | unit = low & CLONE_UNITMASK; |
---|
1298 | dev = newdev(csw, unit | extra, ndev); |
---|
1299 | if (dev->si_flags & SI_CLONELIST) { |
---|
1300 | printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); |
---|
1301 | printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra); |
---|
1302 | LIST_FOREACH(dev, &cd->head, si_clone) { |
---|
1303 | printf("\t%p %s\n", dev, dev->si_name); |
---|
1304 | } |
---|
1305 | panic("foo"); |
---|
1306 | } |
---|
1307 | KASSERT(!(dev->si_flags & SI_CLONELIST), |
---|
1308 | ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); |
---|
1309 | if (dl != NULL) |
---|
1310 | LIST_INSERT_BEFORE(dl, dev, si_clone); |
---|
1311 | else if (de != NULL) |
---|
1312 | LIST_INSERT_AFTER(de, dev, si_clone); |
---|
1313 | else |
---|
1314 | LIST_INSERT_HEAD(&cd->head, dev, si_clone); |
---|
1315 | dev->si_flags |= SI_CLONELIST; |
---|
1316 | *up = unit; |
---|
1317 | dev_unlock_and_free(); |
---|
1318 | return (1); |
---|
1319 | } |
---|
1320 | |
---|
1321 | /* |
---|
1322 | * Kill everything still on the list. The driver should already have |
---|
1323 | * disposed of any softc hung of the struct cdev *'s at this time. |
---|
1324 | */ |
---|
1325 | void |
---|
1326 | clone_cleanup(struct clonedevs **cdp) |
---|
1327 | { |
---|
1328 | struct cdev *dev; |
---|
1329 | struct cdev_priv *cp; |
---|
1330 | struct clonedevs *cd; |
---|
1331 | |
---|
1332 | cd = *cdp; |
---|
1333 | if (cd == NULL) |
---|
1334 | return; |
---|
1335 | dev_lock(); |
---|
1336 | while (!LIST_EMPTY(&cd->head)) { |
---|
1337 | dev = LIST_FIRST(&cd->head); |
---|
1338 | LIST_REMOVE(dev, si_clone); |
---|
1339 | KASSERT(dev->si_flags & SI_CLONELIST, |
---|
1340 | ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); |
---|
1341 | dev->si_flags &= ~SI_CLONELIST; |
---|
1342 | cp = cdev2priv(dev); |
---|
1343 | if (!(cp->cdp_flags & CDP_SCHED_DTR)) { |
---|
1344 | cp->cdp_flags |= CDP_SCHED_DTR; |
---|
1345 | KASSERT(dev->si_flags & SI_NAMED, |
---|
1346 | ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev))); |
---|
1347 | destroy_devl(dev); |
---|
1348 | } |
---|
1349 | } |
---|
1350 | dev_unlock_and_free(); |
---|
1351 | free(cd, M_DEVBUF); |
---|
1352 | *cdp = NULL; |
---|
1353 | } |
---|
1354 | |
---|
1355 | static TAILQ_HEAD(, cdev_priv) dev_ddtr = |
---|
1356 | TAILQ_HEAD_INITIALIZER(dev_ddtr); |
---|
1357 | static struct task dev_dtr_task; |
---|
1358 | |
---|
1359 | static void |
---|
1360 | destroy_dev_tq(void *ctx, int pending) |
---|
1361 | { |
---|
1362 | struct cdev_priv *cp; |
---|
1363 | struct cdev *dev; |
---|
1364 | void (*cb)(void *); |
---|
1365 | void *cb_arg; |
---|
1366 | |
---|
1367 | dev_lock(); |
---|
1368 | while (!TAILQ_EMPTY(&dev_ddtr)) { |
---|
1369 | cp = TAILQ_FIRST(&dev_ddtr); |
---|
1370 | dev = &cp->cdp_c; |
---|
1371 | KASSERT(cp->cdp_flags & CDP_SCHED_DTR, |
---|
1372 | ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp)); |
---|
1373 | TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list); |
---|
1374 | cb = cp->cdp_dtr_cb; |
---|
1375 | cb_arg = cp->cdp_dtr_cb_arg; |
---|
1376 | destroy_devl(dev); |
---|
1377 | dev_unlock_and_free(); |
---|
1378 | dev_rel(dev); |
---|
1379 | if (cb != NULL) |
---|
1380 | cb(cb_arg); |
---|
1381 | dev_lock(); |
---|
1382 | } |
---|
1383 | dev_unlock(); |
---|
1384 | } |
---|
1385 | |
---|
1386 | /* |
---|
1387 | * devmtx shall be locked on entry. devmtx will be unlocked after |
---|
1388 | * function return. |
---|
1389 | */ |
---|
1390 | static int |
---|
1391 | destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg) |
---|
1392 | { |
---|
1393 | struct cdev_priv *cp; |
---|
1394 | |
---|
1395 | mtx_assert(&devmtx, MA_OWNED); |
---|
1396 | cp = cdev2priv(dev); |
---|
1397 | if (cp->cdp_flags & CDP_SCHED_DTR) { |
---|
1398 | dev_unlock(); |
---|
1399 | return (0); |
---|
1400 | } |
---|
1401 | dev_refl(dev); |
---|
1402 | cp->cdp_flags |= CDP_SCHED_DTR; |
---|
1403 | cp->cdp_dtr_cb = cb; |
---|
1404 | cp->cdp_dtr_cb_arg = arg; |
---|
1405 | TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list); |
---|
1406 | dev_unlock(); |
---|
1407 | taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task); |
---|
1408 | return (1); |
---|
1409 | } |
---|
1410 | |
---|
1411 | int |
---|
1412 | destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg) |
---|
1413 | { |
---|
1414 | |
---|
1415 | dev_lock(); |
---|
1416 | return (destroy_dev_sched_cbl(dev, cb, arg)); |
---|
1417 | } |
---|
1418 | |
---|
1419 | int |
---|
1420 | destroy_dev_sched(struct cdev *dev) |
---|
1421 | { |
---|
1422 | |
---|
1423 | return (destroy_dev_sched_cb(dev, NULL, NULL)); |
---|
1424 | } |
---|
1425 | |
---|
1426 | void |
---|
1427 | destroy_dev_drain(struct cdevsw *csw) |
---|
1428 | { |
---|
1429 | |
---|
1430 | dev_lock(); |
---|
1431 | while (!LIST_EMPTY(&csw->d_devs)) { |
---|
1432 | msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10); |
---|
1433 | } |
---|
1434 | dev_unlock(); |
---|
1435 | } |
---|
1436 | |
---|
1437 | void |
---|
1438 | drain_dev_clone_events(void) |
---|
1439 | { |
---|
1440 | |
---|
1441 | sx_xlock(&clone_drain_lock); |
---|
1442 | sx_xunlock(&clone_drain_lock); |
---|
1443 | } |
---|
1444 | |
---|
1445 | static void |
---|
1446 | devdtr_init(void *dummy __unused) |
---|
1447 | { |
---|
1448 | |
---|
1449 | TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL); |
---|
1450 | } |
---|
1451 | |
---|
1452 | SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL); |
---|
1453 | |
---|
1454 | #include <rtems/bsd/local/opt_ddb.h> |
---|
1455 | #ifdef DDB |
---|
1456 | #include <sys/kernel.h> |
---|
1457 | |
---|
1458 | #include <ddb/ddb.h> |
---|
1459 | |
---|
1460 | DB_SHOW_COMMAND(cdev, db_show_cdev) |
---|
1461 | { |
---|
1462 | struct cdev_priv *cdp; |
---|
1463 | struct cdev *dev; |
---|
1464 | u_int flags; |
---|
1465 | char buf[512]; |
---|
1466 | |
---|
1467 | if (!have_addr) { |
---|
1468 | TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { |
---|
1469 | dev = &cdp->cdp_c; |
---|
1470 | db_printf("%s %p\n", dev->si_name, dev); |
---|
1471 | if (db_pager_quit) |
---|
1472 | break; |
---|
1473 | } |
---|
1474 | return; |
---|
1475 | } |
---|
1476 | |
---|
1477 | dev = (struct cdev *)addr; |
---|
1478 | cdp = cdev2priv(dev); |
---|
1479 | db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n", |
---|
1480 | dev->si_name, dev->si_refcount, dev->si_usecount, |
---|
1481 | dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first); |
---|
1482 | db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n", |
---|
1483 | dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2); |
---|
1484 | flags = dev->si_flags; |
---|
1485 | #define SI_FLAG(flag) do { \ |
---|
1486 | if (flags & (flag)) { \ |
---|
1487 | if (buf[0] != '\0') \ |
---|
1488 | strlcat(buf, ", ", sizeof(buf)); \ |
---|
1489 | strlcat(buf, (#flag) + 3, sizeof(buf)); \ |
---|
1490 | flags &= ~(flag); \ |
---|
1491 | } \ |
---|
1492 | } while (0) |
---|
1493 | buf[0] = '\0'; |
---|
1494 | SI_FLAG(SI_ETERNAL); |
---|
1495 | SI_FLAG(SI_ALIAS); |
---|
1496 | SI_FLAG(SI_NAMED); |
---|
1497 | SI_FLAG(SI_CHEAPCLONE); |
---|
1498 | SI_FLAG(SI_CHILD); |
---|
1499 | SI_FLAG(SI_DEVOPEN); |
---|
1500 | SI_FLAG(SI_CONSOPEN); |
---|
1501 | SI_FLAG(SI_DUMPDEV); |
---|
1502 | SI_FLAG(SI_CANDELETE); |
---|
1503 | SI_FLAG(SI_CLONELIST); |
---|
1504 | db_printf("si_flags %s\n", buf); |
---|
1505 | |
---|
1506 | flags = cdp->cdp_flags; |
---|
1507 | #define CDP_FLAG(flag) do { \ |
---|
1508 | if (flags & (flag)) { \ |
---|
1509 | if (buf[0] != '\0') \ |
---|
1510 | strlcat(buf, ", ", sizeof(buf)); \ |
---|
1511 | strlcat(buf, (#flag) + 4, sizeof(buf)); \ |
---|
1512 | flags &= ~(flag); \ |
---|
1513 | } \ |
---|
1514 | } while (0) |
---|
1515 | buf[0] = '\0'; |
---|
1516 | CDP_FLAG(CDP_ACTIVE); |
---|
1517 | CDP_FLAG(CDP_SCHED_DTR); |
---|
1518 | db_printf("cdp_flags %s\n", buf); |
---|
1519 | } |
---|
1520 | #endif |
---|