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