1 | /* |
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2 | * Copyright (c) 2016 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <rtems@embedded-brains.de> |
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9 | * |
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10 | * Redistribution and use in source and binary forms, with or without |
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11 | * modification, are permitted provided that the following conditions |
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12 | * are met: |
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13 | * 1. Redistributions of source code must retain the above copyright |
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14 | * notice, this list of conditions and the following disclaimer. |
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15 | * 2. Redistributions in binary form must reproduce the above copyright |
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16 | * notice, this list of conditions and the following disclaimer in the |
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17 | * documentation and/or other materials provided with the distribution. |
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18 | * |
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19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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29 | * SUCH DAMAGE. |
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30 | */ |
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31 | |
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32 | #include <machine/rtems-bsd-kernel-space.h> |
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33 | |
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34 | #include <sys/types.h> |
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35 | #include <sys/conf.h> |
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36 | #include <sys/kernel.h> |
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37 | #include <sys/file.h> |
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38 | #include <sys/malloc.h> |
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39 | #include <sys/proc.h> |
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40 | #include <sys/poll.h> |
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41 | #include <stdlib.h> |
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42 | #include <string.h> |
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43 | #include <unistd.h> |
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44 | |
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45 | #include <fs/devfs/devfs_int.h> |
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46 | |
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47 | #include <machine/pcpu.h> |
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48 | |
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49 | #include <rtems/imfs.h> |
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50 | |
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51 | #define DEVFS_ROOTINO 2 |
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52 | |
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53 | const char rtems_cdev_directory[] = RTEMS_CDEV_DIRECTORY; |
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54 | |
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55 | /* |
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56 | * The one true (but secret) list of active devices in the system. |
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57 | * Locked by dev_lock()/devmtx |
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58 | */ |
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59 | struct cdev_priv_list cdevp_list = TAILQ_HEAD_INITIALIZER(cdevp_list); |
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60 | |
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61 | struct unrhdr *devfs_inos; |
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62 | |
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63 | static MALLOC_DEFINE(M_CDEVP, "DEVFS1", "DEVFS cdev_priv storage"); |
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64 | |
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65 | static struct cdev * |
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66 | devfs_imfs_get_context_by_iop(rtems_libio_t *iop) |
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67 | { |
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68 | return IMFS_generic_get_context_by_iop(iop); |
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69 | } |
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70 | |
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71 | static int |
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72 | devfs_imfs_open(rtems_libio_t *iop, const char *path, int oflag, mode_t mode) |
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73 | { |
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74 | struct cdev *cdev = devfs_imfs_get_context_by_iop(iop); |
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75 | struct file *fp = rtems_bsd_iop_to_fp(iop); |
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76 | struct thread *td = rtems_bsd_get_curthread_or_null(); |
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77 | struct file *fpop; |
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78 | struct cdevsw *dsw; |
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79 | int error, ref; |
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80 | |
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81 | if (td != NULL) { |
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82 | if (cdev == NULL) { |
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83 | error = ENXIO; |
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84 | goto err; |
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85 | } |
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86 | if (cdev->si_flags & SI_ALIAS) { |
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87 | cdev = cdev->si_parent; |
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88 | } |
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89 | dsw = dev_refthread(cdev, &ref); |
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90 | if (dsw == NULL) { |
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91 | error = ENXIO; |
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92 | goto err; |
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93 | } |
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94 | if (fp == NULL) { |
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95 | dev_relthread(cdev, ref); |
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96 | error = ENXIO; |
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97 | goto err; |
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98 | } |
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99 | fpop = td->td_fpop; |
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100 | curthread->td_fpop = fp; |
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101 | fp->f_cdevpriv = NULL; |
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102 | error = dsw->d_open(cdev, oflag + 1, 0, td); |
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103 | /* Clean up any cdevpriv upon error. */ |
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104 | if (error != 0) |
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105 | devfs_clear_cdevpriv(); |
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106 | curthread->td_fpop = fpop; |
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107 | dev_relthread(cdev, ref); |
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108 | } else { |
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109 | error = ENOMEM; |
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110 | } |
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111 | |
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112 | err: |
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113 | return rtems_bsd_error_to_status_and_errno(error); |
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114 | } |
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115 | |
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116 | static int |
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117 | devfs_imfs_close(rtems_libio_t *iop) |
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118 | { |
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119 | struct cdev *cdev = devfs_imfs_get_context_by_iop(iop); |
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120 | struct file *fp = rtems_bsd_iop_to_fp(iop); |
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121 | struct thread *td = rtems_bsd_get_curthread_or_null(); |
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122 | int flags = rtems_libio_to_fcntl_flags(iop->flags); |
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123 | struct file *fpop; |
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124 | struct cdevsw *dsw; |
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125 | int error, ref; |
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126 | |
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127 | if (td != NULL) { |
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128 | if (cdev == NULL) { |
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129 | error = ENXIO; |
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130 | goto err; |
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131 | } |
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132 | if (cdev->si_flags & SI_ALIAS) { |
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133 | cdev = cdev->si_parent; |
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134 | } |
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135 | dsw = dev_refthread(cdev, &ref); |
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136 | if (dsw == NULL) { |
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137 | error = ENXIO; |
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138 | goto err; |
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139 | } |
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140 | fpop = td->td_fpop; |
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141 | curthread->td_fpop = fp; |
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142 | error = dsw->d_close(cdev, flags, 0, td); |
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143 | curthread->td_fpop = fpop; |
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144 | dev_relthread(cdev, ref); |
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145 | if (fp->f_cdevpriv != NULL) |
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146 | devfs_fpdrop(fp); |
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147 | } else { |
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148 | error = ENOMEM; |
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149 | } |
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150 | |
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151 | err: |
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152 | return rtems_bsd_error_to_status_and_errno(error); |
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153 | } |
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154 | |
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155 | static ssize_t |
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156 | devfs_imfs_readv(rtems_libio_t *iop, const struct iovec *iov, int iovcnt, |
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157 | ssize_t total) |
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158 | { |
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159 | struct cdev *cdev = devfs_imfs_get_context_by_iop(iop); |
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160 | struct file *fp = rtems_bsd_iop_to_fp(iop); |
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161 | struct thread *td = rtems_bsd_get_curthread_or_null(); |
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162 | struct uio uio = { |
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163 | .uio_iov = __DECONST(struct iovec *, iov), |
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164 | .uio_iovcnt = iovcnt, |
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165 | .uio_offset = 0, |
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166 | .uio_resid = total, |
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167 | .uio_segflg = UIO_USERSPACE, |
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168 | .uio_rw = UIO_READ, |
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169 | .uio_td = td |
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170 | }; |
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171 | struct file *fpop; |
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172 | struct cdevsw *dsw; |
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173 | int error, ref; |
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174 | |
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175 | if (td != NULL) { |
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176 | if (cdev == NULL) { |
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177 | error = ENXIO; |
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178 | goto err; |
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179 | } |
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180 | if (cdev->si_flags & SI_ALIAS) { |
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181 | cdev = cdev->si_parent; |
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182 | } |
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183 | dsw = dev_refthread(cdev, &ref); |
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184 | if (dsw == NULL) { |
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185 | error = ENXIO; |
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186 | goto err; |
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187 | } |
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188 | fpop = td->td_fpop; |
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189 | curthread->td_fpop = fp; |
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190 | error = dsw->d_read(cdev, &uio, |
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191 | rtems_libio_to_fcntl_flags(iop->flags)); |
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192 | td->td_fpop = fpop; |
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193 | dev_relthread(cdev, ref); |
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194 | } else { |
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195 | error = ENOMEM; |
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196 | } |
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197 | |
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198 | err: |
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199 | if (error == 0) { |
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200 | return (total - uio.uio_resid); |
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201 | } else { |
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202 | rtems_set_errno_and_return_minus_one(error); |
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203 | } |
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204 | } |
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205 | |
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206 | static ssize_t |
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207 | devfs_imfs_read(rtems_libio_t *iop, void *buffer, size_t count) |
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208 | { |
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209 | struct iovec iov = { |
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210 | .iov_base = buffer, |
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211 | .iov_len = count |
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212 | }; |
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213 | |
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214 | return (devfs_imfs_readv(iop, &iov, 1, count)); |
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215 | } |
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216 | |
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217 | static ssize_t |
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218 | devfs_imfs_writev(rtems_libio_t *iop, const struct iovec *iov, int iovcnt, |
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219 | ssize_t total) |
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220 | { |
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221 | struct cdev *cdev = devfs_imfs_get_context_by_iop(iop); |
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222 | struct file *fp = rtems_bsd_iop_to_fp(iop); |
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223 | struct thread *td = rtems_bsd_get_curthread_or_null(); |
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224 | struct uio uio = { |
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225 | .uio_iov = __DECONST(struct iovec *, iov), |
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226 | .uio_iovcnt = iovcnt, |
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227 | .uio_offset = 0, |
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228 | .uio_resid = total, |
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229 | .uio_segflg = UIO_USERSPACE, |
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230 | .uio_rw = UIO_WRITE, |
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231 | .uio_td = td |
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232 | }; |
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233 | struct file *fpop; |
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234 | struct cdevsw *dsw; |
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235 | int error, ref; |
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236 | |
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237 | if (td != NULL) { |
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238 | if (cdev == NULL) { |
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239 | error = ENXIO; |
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240 | goto err; |
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241 | } |
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242 | if (cdev->si_flags & SI_ALIAS) { |
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243 | cdev = cdev->si_parent; |
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244 | } |
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245 | dsw = dev_refthread(cdev, &ref); |
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246 | if (dsw == NULL) { |
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247 | error = ENXIO; |
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248 | goto err; |
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249 | } |
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250 | fpop = td->td_fpop; |
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251 | curthread->td_fpop = fp; |
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252 | error = dsw->d_write(cdev, &uio, |
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253 | rtems_libio_to_fcntl_flags(iop->flags)); |
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254 | td->td_fpop = fpop; |
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255 | dev_relthread(cdev, ref); |
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256 | } else { |
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257 | error = ENOMEM; |
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258 | } |
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259 | |
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260 | err: |
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261 | if (error == 0) { |
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262 | return (total - uio.uio_resid); |
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263 | } else { |
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264 | rtems_set_errno_and_return_minus_one(error); |
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265 | } |
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266 | } |
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267 | |
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268 | static ssize_t |
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269 | devfs_imfs_write(rtems_libio_t *iop, const void *buffer, size_t count) |
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270 | { |
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271 | struct iovec iov = { |
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272 | .iov_base = __DECONST(void *, buffer), |
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273 | .iov_len = count |
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274 | }; |
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275 | |
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276 | return (devfs_imfs_writev(iop, &iov, 1, count)); |
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277 | } |
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278 | |
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279 | static int |
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280 | devfs_imfs_ioctl(rtems_libio_t *iop, ioctl_command_t request, void *buffer) |
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281 | { |
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282 | struct cdev *cdev = devfs_imfs_get_context_by_iop(iop); |
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283 | struct file *fp = rtems_bsd_iop_to_fp(iop); |
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284 | struct thread *td = rtems_bsd_get_curthread_or_null(); |
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285 | struct file *fpop; |
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286 | struct cdevsw *dsw; |
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287 | int error, ref; |
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288 | int flags = rtems_libio_to_fcntl_flags(iop->flags); |
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289 | |
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290 | if (td != 0) { |
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291 | if (cdev == NULL) { |
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292 | error = ENXIO; |
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293 | goto err; |
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294 | } |
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295 | if (cdev->si_flags & SI_ALIAS) { |
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296 | cdev = cdev->si_parent; |
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297 | } |
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298 | dsw = dev_refthread(cdev, &ref); |
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299 | if (dsw == NULL) { |
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300 | error = ENXIO; |
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301 | goto err; |
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302 | } |
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303 | fpop = td->td_fpop; |
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304 | curthread->td_fpop = fp; |
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305 | error = dsw->d_ioctl(cdev, request, buffer, flags, |
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306 | td); |
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307 | td->td_fpop = fpop; |
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308 | dev_relthread(cdev, ref); |
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309 | } else { |
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310 | error = ENOMEM; |
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311 | } |
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312 | |
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313 | err: |
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314 | return rtems_bsd_error_to_status_and_errno(error); |
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315 | } |
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316 | |
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317 | static int |
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318 | devfs_imfs_fstat(const rtems_filesystem_location_info_t *loc, struct stat *buf) |
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319 | { |
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320 | int rv = 0; |
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321 | const IMFS_jnode_t *the_dev = loc->node_access; |
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322 | |
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323 | if (the_dev != NULL) { |
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324 | buf->st_mode = the_dev->st_mode; |
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325 | } else { |
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326 | rv = rtems_filesystem_default_fstat(loc, buf); |
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327 | } |
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328 | |
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329 | return rv; |
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330 | } |
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331 | |
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332 | static int |
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333 | devfs_imfs_poll(rtems_libio_t *iop, int events) |
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334 | { |
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335 | struct cdev *cdev = devfs_imfs_get_context_by_iop(iop); |
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336 | struct file *fp = rtems_bsd_iop_to_fp(iop); |
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337 | struct thread *td = rtems_bsd_get_curthread_or_wait_forever(); |
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338 | struct file *fpop; |
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339 | struct cdevsw *dsw; |
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340 | int error, ref; |
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341 | |
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342 | if (cdev == NULL) { |
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343 | return POLLERR; |
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344 | } |
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345 | if (cdev->si_flags & SI_ALIAS) { |
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346 | cdev = cdev->si_parent; |
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347 | } |
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348 | dsw = dev_refthread(cdev, &ref); |
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349 | if (dsw == NULL) { |
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350 | return POLLERR; |
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351 | } |
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352 | fpop = td->td_fpop; |
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353 | curthread->td_fpop = fp; |
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354 | error = dsw->d_poll(cdev, events, td); |
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355 | td->td_fpop = fpop; |
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356 | dev_relthread(cdev, ref); |
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357 | |
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358 | return error; |
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359 | } |
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360 | |
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361 | static int |
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362 | devfs_imfs_kqfilter(rtems_libio_t *iop, struct knote *kn) |
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363 | { |
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364 | struct cdev *cdev = devfs_imfs_get_context_by_iop(iop); |
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365 | struct file *fp = rtems_bsd_iop_to_fp(iop); |
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366 | struct thread *td = rtems_bsd_get_curthread_or_wait_forever(); |
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367 | struct file *fpop; |
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368 | struct cdevsw *dsw; |
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369 | int error, ref; |
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370 | |
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371 | if (cdev == NULL) { |
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372 | return EINVAL; |
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373 | } |
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374 | if (cdev->si_flags & SI_ALIAS) { |
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375 | cdev = cdev->si_parent; |
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376 | } |
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377 | dsw = dev_refthread(cdev, &ref); |
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378 | if (dsw == NULL) { |
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379 | return EINVAL; |
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380 | } |
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381 | fpop = td->td_fpop; |
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382 | curthread->td_fpop = fp; |
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383 | error = dsw->d_kqfilter(cdev, kn); |
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384 | td->td_fpop = fpop; |
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385 | dev_relthread(cdev, ref); |
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386 | |
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387 | return error; |
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388 | } |
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389 | |
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390 | static const rtems_filesystem_file_handlers_r devfs_imfs_handlers = { |
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391 | .open_h = devfs_imfs_open, |
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392 | .close_h = devfs_imfs_close, |
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393 | .read_h = devfs_imfs_read, |
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394 | .write_h = devfs_imfs_write, |
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395 | .ioctl_h = devfs_imfs_ioctl, |
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396 | .lseek_h = rtems_filesystem_default_lseek_file, |
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397 | .fstat_h = devfs_imfs_fstat, |
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398 | .ftruncate_h = rtems_filesystem_default_ftruncate, |
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399 | .fsync_h = rtems_filesystem_default_fsync_or_fdatasync, |
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400 | .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync, |
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401 | .fcntl_h = rtems_filesystem_default_fcntl, |
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402 | .poll_h = devfs_imfs_poll, |
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403 | .kqfilter_h = devfs_imfs_kqfilter, |
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404 | .readv_h = devfs_imfs_readv, |
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405 | .writev_h = devfs_imfs_writev, |
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406 | }; |
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407 | |
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408 | static const IMFS_node_control devfs_imfs_control = IMFS_GENERIC_INITIALIZER( |
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409 | &devfs_imfs_handlers, IMFS_node_initialize_generic, |
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410 | IMFS_node_destroy_default); |
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411 | |
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412 | struct cdev * |
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413 | devfs_alloc(int flags) |
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414 | { |
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415 | struct cdev_priv *cdp; |
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416 | struct cdev *cdev; |
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417 | |
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418 | cdp = malloc(sizeof *cdp, M_CDEVP, M_ZERO | |
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419 | ((flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK)); |
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420 | if (cdp == NULL) |
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421 | return (NULL); |
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422 | |
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423 | cdev = &cdp->cdp_c; |
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424 | LIST_INIT(&cdev->si_children); |
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425 | |
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426 | memcpy(cdev->si_path, rtems_cdev_directory, sizeof(cdev->si_path)); |
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427 | return (cdev); |
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428 | } |
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429 | |
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430 | void |
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431 | devfs_free(struct cdev *cdev) |
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432 | { |
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433 | struct cdev_priv *cdp; |
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434 | |
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435 | cdp = cdev2priv(cdev); |
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436 | devfs_free_cdp_inode(cdp->cdp_inode); |
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437 | free(cdp, M_CDEVP); |
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438 | } |
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439 | |
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440 | /* |
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441 | * Create the directory for a device. |
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442 | * Note: This don't uses dirname() because this function is not defined thread |
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443 | * save in POSIX. |
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444 | */ |
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445 | static void |
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446 | devfs_create_directory(const char *devname) |
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447 | { |
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448 | char *dir = NULL; |
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449 | char *lastsep = NULL; |
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450 | int rv; |
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451 | mode_t mode = S_IRWXU | S_IRWXG | S_IRWXO; |
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452 | |
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453 | dir = strdup(devname, M_TEMP); |
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454 | BSD_ASSERT(dir != NULL); |
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455 | |
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456 | lastsep = strrchr(dir, '/'); |
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457 | if(lastsep != NULL) { |
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458 | *lastsep = 0; |
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459 | rv = rtems_mkdir(dir, mode); |
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460 | BSD_ASSERT(rv == 0); |
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461 | } |
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462 | |
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463 | free(dir, M_TEMP); |
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464 | } |
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465 | |
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466 | /* |
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467 | * devfs_create() and devfs_destroy() are called from kern_conf.c and |
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468 | * in both cases the devlock() mutex is held, so no further locking |
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469 | * is necesary and no sleeping allowed. |
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470 | */ |
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471 | |
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472 | void |
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473 | devfs_create(struct cdev *dev) |
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474 | { |
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475 | struct cdev_priv *cdp; |
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476 | int rv; |
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477 | mode_t mode = S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO; |
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478 | |
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479 | devfs_create_directory(dev->si_path); |
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480 | |
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481 | rv = IMFS_make_generic_node(dev->si_path, mode, &devfs_imfs_control, |
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482 | dev); |
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483 | BSD_ASSERT(rv == 0); |
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484 | |
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485 | cdp = cdev2priv(dev); |
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486 | cdp->cdp_flags |= CDP_ACTIVE; |
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487 | cdp->cdp_inode = alloc_unrl(devfs_inos); |
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488 | dev_refl(dev); |
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489 | TAILQ_INSERT_TAIL(&cdevp_list, cdp, cdp_list); |
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490 | } |
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491 | |
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492 | void |
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493 | devfs_destroy(struct cdev *dev) |
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494 | { |
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495 | struct cdev_priv *cdp; |
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496 | int rv; |
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497 | |
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498 | cdp = cdev2priv(dev); |
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499 | cdp->cdp_flags &= ~CDP_ACTIVE; |
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500 | |
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501 | rv = unlink(dev->si_path); |
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502 | BSD_ASSERT(rv == 0); |
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503 | |
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504 | /* FIXME: Check if directory is empty and remove it. */ |
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505 | } |
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506 | |
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507 | int |
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508 | devfs_dev_exists(const char *name) |
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509 | { |
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510 | const size_t dirlen = sizeof(rtems_cdev_directory) - 1; |
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511 | const size_t maxnamelen = SPECNAMELEN; |
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512 | |
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513 | int rv; |
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514 | char fullpath[dirlen + maxnamelen + 1]; |
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515 | |
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516 | memcpy(fullpath, rtems_cdev_directory, dirlen); |
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517 | strncpy(fullpath + dirlen, name, maxnamelen); |
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518 | |
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519 | rv = access(fullpath, F_OK); |
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520 | |
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521 | if(rv == 0) |
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522 | return 1; |
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523 | else |
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524 | return 0; |
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525 | } |
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526 | |
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527 | ino_t |
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528 | devfs_alloc_cdp_inode(void) |
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529 | { |
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530 | |
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531 | return (alloc_unr(devfs_inos)); |
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532 | } |
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533 | |
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534 | void |
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535 | devfs_free_cdp_inode(ino_t ino) |
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536 | { |
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537 | |
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538 | if (ino > 0) |
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539 | free_unr(devfs_inos, ino); |
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540 | } |
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541 | |
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542 | static void |
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543 | devfs_devs_init(void *junk __unused) |
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544 | { |
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545 | |
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546 | devfs_inos = new_unrhdr(DEVFS_ROOTINO + 1, INT_MAX, &devmtx); |
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547 | } |
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548 | |
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549 | SYSINIT(devfs_devs, SI_SUB_DEVFS, SI_ORDER_FIRST, devfs_devs_init, NULL); |
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