pud.c revision 1.3.2.2
1 1.3.2.2 joerg /* $NetBSD: pud.c,v 1.3.2.2 2007/11/21 21:55:43 joerg Exp $ */ 2 1.3.2.2 joerg 3 1.3.2.2 joerg /* 4 1.3.2.2 joerg * Copyright (c) 2007 Antti Kantee. All Rights Reserved. 5 1.3.2.2 joerg * 6 1.3.2.2 joerg * Development of this software was supported by the 7 1.3.2.2 joerg * Research Foundation of Helsinki University of Technology 8 1.3.2.2 joerg * 9 1.3.2.2 joerg * Redistribution and use in source and binary forms, with or without 10 1.3.2.2 joerg * modification, are permitted provided that the following conditions 11 1.3.2.2 joerg * are met: 12 1.3.2.2 joerg * 1. Redistributions of source code must retain the above copyright 13 1.3.2.2 joerg * notice, this list of conditions and the following disclaimer. 14 1.3.2.2 joerg * 2. Redistributions in binary form must reproduce the above copyright 15 1.3.2.2 joerg * notice, this list of conditions and the following disclaimer in the 16 1.3.2.2 joerg * documentation and/or other materials provided with the distribution. 17 1.3.2.2 joerg * 18 1.3.2.2 joerg * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 19 1.3.2.2 joerg * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 1.3.2.2 joerg * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 1.3.2.2 joerg * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 1.3.2.2 joerg * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 1.3.2.2 joerg * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 1.3.2.2 joerg * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 1.3.2.2 joerg * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 1.3.2.2 joerg * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 1.3.2.2 joerg * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 1.3.2.2 joerg * SUCH DAMAGE. 29 1.3.2.2 joerg */ 30 1.3.2.2 joerg 31 1.3.2.2 joerg #include <sys/cdefs.h> 32 1.3.2.2 joerg __KERNEL_RCSID(0, "$NetBSD: pud.c,v 1.3.2.2 2007/11/21 21:55:43 joerg Exp $"); 33 1.3.2.2 joerg 34 1.3.2.2 joerg #include <sys/param.h> 35 1.3.2.2 joerg #include <sys/conf.h> 36 1.3.2.2 joerg #include <sys/kmem.h> 37 1.3.2.2 joerg #include <sys/poll.h> 38 1.3.2.2 joerg #include <sys/queue.h> 39 1.3.2.2 joerg 40 1.3.2.2 joerg #include <dev/pud/pud_sys.h> 41 1.3.2.2 joerg #include <dev/putter/putter_sys.h> 42 1.3.2.2 joerg 43 1.3.2.2 joerg void pudattach(void); 44 1.3.2.2 joerg 45 1.3.2.2 joerg static int pud_putter_getout(void *, size_t, int, uint8_t **, 46 1.3.2.2 joerg size_t *, void **); 47 1.3.2.2 joerg static void pud_putter_releaseout(void *, void *, int); 48 1.3.2.2 joerg static int pud_putter_dispatch(void *, struct putter_hdr *); 49 1.3.2.2 joerg static size_t pud_putter_waitcount(void *); 50 1.3.2.2 joerg static int pud_putter_close(void *); 51 1.3.2.2 joerg 52 1.3.2.2 joerg struct putter_ops pud_putter = { 53 1.3.2.2 joerg .pop_getout = pud_putter_getout, 54 1.3.2.2 joerg .pop_releaseout = pud_putter_releaseout, 55 1.3.2.2 joerg .pop_waitcount = pud_putter_waitcount, 56 1.3.2.2 joerg .pop_dispatch = pud_putter_dispatch, 57 1.3.2.2 joerg .pop_close = pud_putter_close, 58 1.3.2.2 joerg }; 59 1.3.2.2 joerg 60 1.3.2.2 joerg extern struct bdevsw pud_bdevsw; 61 1.3.2.2 joerg extern struct cdevsw pud_cdevsw; 62 1.3.2.2 joerg 63 1.3.2.2 joerg kmutex_t pud_mtx; 64 1.3.2.2 joerg static LIST_HEAD(, pud_dev) pudlist = LIST_HEAD_INITIALIZER(pudlist); 65 1.3.2.2 joerg 66 1.3.2.2 joerg static uint64_t 67 1.3.2.2 joerg nextreq(struct pud_dev *pd) 68 1.3.2.2 joerg { 69 1.3.2.2 joerg uint64_t rv; 70 1.3.2.2 joerg 71 1.3.2.2 joerg mutex_enter(&pd->pd_mtx); 72 1.3.2.2 joerg rv = pd->pd_nextreq++; 73 1.3.2.2 joerg mutex_exit(&pd->pd_mtx); 74 1.3.2.2 joerg 75 1.3.2.2 joerg return rv; 76 1.3.2.2 joerg } 77 1.3.2.2 joerg 78 1.3.2.2 joerg static int 79 1.3.2.2 joerg pud_putter_getout(void *this, size_t maxsize, int nonblock, 80 1.3.2.2 joerg uint8_t **data, size_t *dlen, void **cookie) 81 1.3.2.2 joerg { 82 1.3.2.2 joerg struct pud_dev *pd = this; 83 1.3.2.2 joerg struct pud_touser *putp; 84 1.3.2.2 joerg int error = 0; 85 1.3.2.2 joerg 86 1.3.2.2 joerg mutex_enter(&pd->pd_mtx); 87 1.3.2.2 joerg for (;;) { 88 1.3.2.2 joerg if (TAILQ_EMPTY(&pd->pd_waitq_req)) { 89 1.3.2.2 joerg if (nonblock) { 90 1.3.2.2 joerg error = EWOULDBLOCK; 91 1.3.2.2 joerg break; 92 1.3.2.2 joerg } 93 1.3.2.2 joerg 94 1.3.2.2 joerg error = cv_wait_sig(&pd->pd_waitq_req_cv, &pd->pd_mtx); 95 1.3.2.2 joerg if (error) 96 1.3.2.2 joerg break; 97 1.3.2.2 joerg else 98 1.3.2.2 joerg continue; 99 1.3.2.2 joerg } 100 1.3.2.2 joerg 101 1.3.2.2 joerg putp = TAILQ_FIRST(&pd->pd_waitq_req); 102 1.3.2.2 joerg TAILQ_REMOVE(&pd->pd_waitq_req, putp, pt_entries); 103 1.3.2.2 joerg KASSERT(error == 0); 104 1.3.2.2 joerg break; 105 1.3.2.2 joerg } 106 1.3.2.2 joerg mutex_exit(&pd->pd_mtx); 107 1.3.2.2 joerg 108 1.3.2.2 joerg if (error == 0) { 109 1.3.2.2 joerg *data = (uint8_t *)putp->pt_pdr; 110 1.3.2.2 joerg *dlen = putp->pt_pdr->pdr_pth.pth_framelen; 111 1.3.2.2 joerg *cookie = putp; 112 1.3.2.2 joerg } 113 1.3.2.2 joerg 114 1.3.2.2 joerg return error; 115 1.3.2.2 joerg } 116 1.3.2.2 joerg 117 1.3.2.2 joerg static void 118 1.3.2.2 joerg pud_putter_releaseout(void *this, void *cookie, int status) 119 1.3.2.2 joerg { 120 1.3.2.2 joerg struct pud_dev *pd = this; 121 1.3.2.2 joerg struct pud_touser *putp = cookie; 122 1.3.2.2 joerg 123 1.3.2.2 joerg mutex_enter(&pd->pd_mtx); 124 1.3.2.2 joerg TAILQ_INSERT_TAIL(&pd->pd_waitq_resp, putp, pt_entries); 125 1.3.2.2 joerg mutex_exit(&pd->pd_mtx); 126 1.3.2.2 joerg 127 1.3.2.2 joerg } 128 1.3.2.2 joerg 129 1.3.2.2 joerg static size_t 130 1.3.2.2 joerg pud_putter_waitcount(void *this) 131 1.3.2.2 joerg { 132 1.3.2.2 joerg struct pud_dev *pd = this; 133 1.3.2.2 joerg size_t rv; 134 1.3.2.2 joerg 135 1.3.2.2 joerg mutex_enter(&pd->pd_mtx); 136 1.3.2.2 joerg rv = pd->pd_waitcount; 137 1.3.2.2 joerg mutex_exit(&pd->pd_mtx); 138 1.3.2.2 joerg 139 1.3.2.2 joerg return rv; 140 1.3.2.2 joerg } 141 1.3.2.2 joerg 142 1.3.2.2 joerg static int 143 1.3.2.2 joerg pudop_dev(struct pud_dev *pd, struct pud_req *pdr) 144 1.3.2.2 joerg { 145 1.3.2.2 joerg struct putter_hdr *pth = (void *)pdr; 146 1.3.2.2 joerg struct pud_touser *putp; 147 1.3.2.2 joerg 148 1.3.2.2 joerg mutex_enter(&pd->pd_mtx); 149 1.3.2.2 joerg TAILQ_FOREACH(putp, &pd->pd_waitq_resp, pt_entries) 150 1.3.2.2 joerg if (putp->pt_pdr->pdr_reqid == pdr->pdr_reqid) 151 1.3.2.2 joerg break; 152 1.3.2.2 joerg if (putp == NULL) { 153 1.3.2.2 joerg mutex_exit(&pd->pd_mtx); 154 1.3.2.2 joerg return EINVAL; 155 1.3.2.2 joerg } 156 1.3.2.2 joerg TAILQ_REMOVE(&pd->pd_waitq_resp, putp, pt_entries); 157 1.3.2.2 joerg mutex_exit(&pd->pd_mtx); 158 1.3.2.2 joerg 159 1.3.2.2 joerg if (pth->pth_framelen > putp->pt_pdr->pdr_len) { 160 1.3.2.2 joerg return EINVAL; 161 1.3.2.2 joerg } 162 1.3.2.2 joerg memcpy(putp->pt_pdr, pth, pth->pth_framelen); 163 1.3.2.2 joerg cv_signal(&putp->pt_cv); 164 1.3.2.2 joerg 165 1.3.2.2 joerg return 0; 166 1.3.2.2 joerg } 167 1.3.2.2 joerg 168 1.3.2.2 joerg /* 169 1.3.2.2 joerg * Register our major number. Always register char device functions, 170 1.3.2.2 joerg * register block devices optionally. 171 1.3.2.2 joerg * 172 1.3.2.2 joerg * XXX: no way to configure "any major you like" currently. 173 1.3.2.2 joerg */ 174 1.3.2.2 joerg static int 175 1.3.2.2 joerg pudconf_reg(struct pud_dev *pd, struct pud_conf_reg *pcr) 176 1.3.2.2 joerg { 177 1.3.2.2 joerg struct bdevsw *bsw; 178 1.3.2.2 joerg int cmajor, bmajor, error; 179 1.3.2.2 joerg 180 1.3.2.2 joerg cmajor = major(pcr->pm_regdev); 181 1.3.2.2 joerg if (pcr->pm_flags & PUD_CONFFLAG_BDEV) { 182 1.3.2.2 joerg bsw = &pud_bdevsw; 183 1.3.2.2 joerg bmajor = cmajor; 184 1.3.2.2 joerg } else { 185 1.3.2.2 joerg bsw = NULL; 186 1.3.2.2 joerg bmajor = -1; 187 1.3.2.2 joerg } 188 1.3.2.2 joerg 189 1.3.2.2 joerg pcr->pm_devname[PUD_DEVNAME_MAX] = '\0'; 190 1.3.2.2 joerg error = devsw_attach(pcr->pm_devname, bsw, &bmajor, 191 1.3.2.2 joerg &pud_cdevsw, &cmajor); 192 1.3.2.2 joerg if (error == 0) 193 1.3.2.2 joerg pd->pd_dev = pcr->pm_regdev; 194 1.3.2.2 joerg 195 1.3.2.2 joerg return error; 196 1.3.2.2 joerg } 197 1.3.2.2 joerg 198 1.3.2.2 joerg static int 199 1.3.2.2 joerg pudop_conf(struct pud_dev *pd, struct pud_req *pdr) 200 1.3.2.2 joerg { 201 1.3.2.2 joerg int rv; 202 1.3.2.2 joerg 203 1.3.2.2 joerg switch (pdr->pdr_reqtype) { 204 1.3.2.2 joerg case PUD_CONF_REG: 205 1.3.2.2 joerg rv = pudconf_reg(pd, (struct pud_conf_reg *)pdr); 206 1.3.2.2 joerg break; 207 1.3.2.2 joerg case PUD_CONF_DEREG: 208 1.3.2.2 joerg /* unimplemented */ 209 1.3.2.2 joerg rv = 0; 210 1.3.2.2 joerg break; 211 1.3.2.2 joerg case PUD_CONF_IOCTL: 212 1.3.2.2 joerg /* unimplemented */ 213 1.3.2.2 joerg rv = 0; 214 1.3.2.2 joerg break; 215 1.3.2.2 joerg default: 216 1.3.2.2 joerg rv = EINVAL; 217 1.3.2.2 joerg break; 218 1.3.2.2 joerg } 219 1.3.2.2 joerg 220 1.3.2.2 joerg return rv; 221 1.3.2.2 joerg } 222 1.3.2.2 joerg 223 1.3.2.2 joerg static int 224 1.3.2.2 joerg pud_putter_dispatch(void *this, struct putter_hdr *pth) 225 1.3.2.2 joerg { 226 1.3.2.2 joerg struct pud_dev *pd = this; 227 1.3.2.2 joerg struct pud_req *pdr = (void *)pth; 228 1.3.2.2 joerg int rv; 229 1.3.2.2 joerg 230 1.3.2.2 joerg if (pdr->pdr_pth.pth_framelen < sizeof(struct pud_req)) 231 1.3.2.2 joerg return EINVAL; 232 1.3.2.2 joerg 233 1.3.2.2 joerg switch (pdr->pdr_reqclass) { 234 1.3.2.2 joerg case PUD_REQ_CDEV: 235 1.3.2.2 joerg case PUD_REQ_BDEV: 236 1.3.2.2 joerg rv = pudop_dev(pd, pdr); 237 1.3.2.2 joerg break; 238 1.3.2.2 joerg case PUD_REQ_CONF: 239 1.3.2.2 joerg rv = pudop_conf(pd, pdr); 240 1.3.2.2 joerg break; 241 1.3.2.2 joerg default: 242 1.3.2.2 joerg rv = EINVAL; 243 1.3.2.2 joerg break; 244 1.3.2.2 joerg } 245 1.3.2.2 joerg 246 1.3.2.2 joerg return rv; 247 1.3.2.2 joerg } 248 1.3.2.2 joerg 249 1.3.2.2 joerg /* Device server severed the umbilical cord */ 250 1.3.2.2 joerg static int 251 1.3.2.2 joerg pud_putter_close(void *this) 252 1.3.2.2 joerg { 253 1.3.2.2 joerg struct pud_dev *pd = this; 254 1.3.2.2 joerg struct pud_touser *putp; 255 1.3.2.2 joerg 256 1.3.2.2 joerg mutex_enter(&pud_mtx); 257 1.3.2.2 joerg LIST_REMOVE(pd, pd_entries); 258 1.3.2.2 joerg mutex_exit(&pud_mtx); 259 1.3.2.2 joerg 260 1.3.2.2 joerg mutex_enter(&pd->pd_mtx); 261 1.3.2.2 joerg while ((putp = TAILQ_FIRST(&pd->pd_waitq_req)) != NULL) { 262 1.3.2.2 joerg putp->pt_pdr->pdr_rv = ENXIO; 263 1.3.2.2 joerg cv_signal(&putp->pt_cv); 264 1.3.2.2 joerg TAILQ_REMOVE(&pd->pd_waitq_req, putp, pt_entries); 265 1.3.2.2 joerg } 266 1.3.2.2 joerg 267 1.3.2.2 joerg while ((putp = TAILQ_FIRST(&pd->pd_waitq_resp)) != NULL) { 268 1.3.2.2 joerg putp->pt_pdr->pdr_rv = ENXIO; 269 1.3.2.2 joerg cv_signal(&putp->pt_cv); 270 1.3.2.2 joerg TAILQ_REMOVE(&pd->pd_waitq_resp, putp, pt_entries); 271 1.3.2.2 joerg } 272 1.3.2.2 joerg if (pd->pd_waitcount) 273 1.3.2.2 joerg cv_wait(&pd->pd_draincv, &pd->pd_mtx); 274 1.3.2.2 joerg KASSERT(pd->pd_waitcount == 0); 275 1.3.2.2 joerg 276 1.3.2.2 joerg mutex_exit(&pd->pd_mtx); 277 1.3.2.2 joerg 278 1.3.2.2 joerg if (pd->pd_dev) 279 1.3.2.2 joerg devsw_detach(&pud_bdevsw /* XXX */, &pud_cdevsw); 280 1.3.2.2 joerg 281 1.3.2.2 joerg putter_detach(pd->pd_pi); 282 1.3.2.2 joerg kmem_free(pd, sizeof(struct pud_dev)); 283 1.3.2.2 joerg 284 1.3.2.2 joerg return 0; 285 1.3.2.2 joerg } 286 1.3.2.2 joerg 287 1.3.2.2 joerg struct pud_dev * 288 1.3.2.2 joerg pud_dev2pud(dev_t dev) 289 1.3.2.2 joerg { 290 1.3.2.2 joerg struct pud_dev *pd; 291 1.3.2.2 joerg 292 1.3.2.2 joerg mutex_enter(&pud_mtx); 293 1.3.2.2 joerg LIST_FOREACH(pd, &pudlist, pd_entries) 294 1.3.2.2 joerg if (major(pd->pd_dev) == major(dev)) 295 1.3.2.2 joerg break; 296 1.3.2.2 joerg mutex_exit(&pud_mtx); 297 1.3.2.2 joerg 298 1.3.2.2 joerg return pd; 299 1.3.2.2 joerg } 300 1.3.2.2 joerg 301 1.3.2.2 joerg /* Toss request to the device server and wait for result */ 302 1.3.2.2 joerg int 303 1.3.2.2 joerg pud_request(dev_t dev, void *data, size_t dlen, int class, int type) 304 1.3.2.2 joerg { 305 1.3.2.2 joerg struct pud_touser put; 306 1.3.2.2 joerg struct pud_req *pdr = data; 307 1.3.2.2 joerg struct pud_dev *pd; 308 1.3.2.2 joerg 309 1.3.2.2 joerg pd = pud_dev2pud(dev); 310 1.3.2.2 joerg if (pd == NULL) 311 1.3.2.2 joerg return ENXIO; 312 1.3.2.2 joerg 313 1.3.2.2 joerg pdr->pdr_dev = dev; 314 1.3.2.2 joerg pdr->pdr_len = pdr->pdr_pth.pth_framelen = dlen; 315 1.3.2.2 joerg pdr->pdr_reqid = nextreq(pd); 316 1.3.2.2 joerg 317 1.3.2.2 joerg pdr->pdr_reqclass = class; 318 1.3.2.2 joerg pdr->pdr_reqtype = type; 319 1.3.2.2 joerg 320 1.3.2.2 joerg put.pt_pdr = pdr; 321 1.3.2.2 joerg cv_init(&put.pt_cv, "pudresp"); 322 1.3.2.2 joerg 323 1.3.2.2 joerg mutex_enter(&pd->pd_mtx); 324 1.3.2.2 joerg pd->pd_waitcount++; 325 1.3.2.2 joerg 326 1.3.2.2 joerg TAILQ_INSERT_TAIL(&pd->pd_waitq_req, &put, pt_entries); 327 1.3.2.2 joerg putter_notify(pd->pd_pi); 328 1.3.2.2 joerg cv_broadcast(&pd->pd_waitq_req_cv); 329 1.3.2.2 joerg cv_wait(&put.pt_cv, &pd->pd_mtx); 330 1.3.2.2 joerg 331 1.3.2.2 joerg if (--pd->pd_waitcount == 0) 332 1.3.2.2 joerg cv_signal(&pd->pd_draincv); 333 1.3.2.2 joerg mutex_exit(&pd->pd_mtx); 334 1.3.2.2 joerg 335 1.3.2.2 joerg return pdr->pdr_rv; 336 1.3.2.2 joerg } 337 1.3.2.2 joerg 338 1.3.2.2 joerg /* Called from putter based on minor dev number */ 339 1.3.2.2 joerg int 340 1.3.2.2 joerg pud_config(int fd, int flags, int fmt) 341 1.3.2.2 joerg { 342 1.3.2.2 joerg struct pud_dev *pd; 343 1.3.2.2 joerg 344 1.3.2.2 joerg pd = kmem_zalloc(sizeof(struct pud_dev), KM_SLEEP); 345 1.3.2.2 joerg pd->pd_pi = putter_attach(curlwp->l_proc->p_pid, fd, pd, &pud_putter); 346 1.3.2.2 joerg if (pd->pd_pi == NULL) { 347 1.3.2.2 joerg kmem_free(pd, sizeof(struct pud_dev)); 348 1.3.2.2 joerg return ENOENT; /* XXX */ 349 1.3.2.2 joerg } 350 1.3.2.2 joerg pd->pd_dev = NODEV; 351 1.3.2.2 joerg 352 1.3.2.2 joerg mutex_init(&pd->pd_mtx, MUTEX_DEFAULT, IPL_NONE); 353 1.3.2.2 joerg TAILQ_INIT(&pd->pd_waitq_req); 354 1.3.2.2 joerg TAILQ_INIT(&pd->pd_waitq_resp); 355 1.3.2.2 joerg cv_init(&pd->pd_waitq_req_cv, "pudreq"); 356 1.3.2.2 joerg cv_init(&pd->pd_draincv, "pudrain"); 357 1.3.2.2 joerg 358 1.3.2.2 joerg mutex_enter(&pud_mtx); 359 1.3.2.2 joerg LIST_INSERT_HEAD(&pudlist, pd, pd_entries); 360 1.3.2.2 joerg mutex_exit(&pud_mtx); 361 1.3.2.2 joerg 362 1.3.2.2 joerg return 0; 363 1.3.2.2 joerg } 364 1.3.2.2 joerg 365 1.3.2.2 joerg void 366 1.3.2.2 joerg pudattach() 367 1.3.2.2 joerg { 368 1.3.2.2 joerg int error; 369 1.3.2.2 joerg 370 1.3.2.2 joerg if ((error = putter_register(pud_config, PUTTER_MINOR_PUD)) != 0) { 371 1.3.2.2 joerg printf("pudattach: can't register to putter: %d\n", error); 372 1.3.2.2 joerg return; 373 1.3.2.2 joerg } 374 1.3.2.2 joerg mutex_init(&pud_mtx, MUTEX_DEFAULT, IPL_NONE); 375 1.3.2.2 joerg } 376
Indexes created Mon Oct 27 20:09:55 GMT 2025