pud.c revision 1.3
1 /* $NetBSD: pud.c,v 1.3 2007/11/21 18:10:48 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Antti Kantee. All Rights Reserved. 5 * 6 * Development of this software was supported by the 7 * Research Foundation of Helsinki University of Technology 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 19 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: pud.c,v 1.3 2007/11/21 18:10:48 pooka Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/conf.h> 36 #include <sys/kmem.h> 37 #include <sys/poll.h> 38 #include <sys/queue.h> 39 40 #include <dev/pud/pud_sys.h> 41 #include <dev/putter/putter_sys.h> 42 43 void pudattach(void); 44 45 static int pud_putter_getout(void *, size_t, int, uint8_t **, 46 size_t *, void **); 47 static void pud_putter_releaseout(void *, void *, int); 48 static int pud_putter_dispatch(void *, struct putter_hdr *); 49 static size_t pud_putter_waitcount(void *); 50 static int pud_putter_close(void *); 51 52 struct putter_ops pud_putter = { 53 .pop_getout = pud_putter_getout, 54 .pop_releaseout = pud_putter_releaseout, 55 .pop_waitcount = pud_putter_waitcount, 56 .pop_dispatch = pud_putter_dispatch, 57 .pop_close = pud_putter_close, 58 }; 59 60 extern struct bdevsw pud_bdevsw; 61 extern struct cdevsw pud_cdevsw; 62 63 kmutex_t pud_mtx; 64 static LIST_HEAD(, pud_dev) pudlist = LIST_HEAD_INITIALIZER(pudlist); 65 66 static uint64_t 67 nextreq(struct pud_dev *pd) 68 { 69 uint64_t rv; 70 71 mutex_enter(&pd->pd_mtx); 72 rv = pd->pd_nextreq++; 73 mutex_exit(&pd->pd_mtx); 74 75 return rv; 76 } 77 78 static int 79 pud_putter_getout(void *this, size_t maxsize, int nonblock, 80 uint8_t **data, size_t *dlen, void **cookie) 81 { 82 struct pud_dev *pd = this; 83 struct pud_touser *putp; 84 int error = 0; 85 86 mutex_enter(&pd->pd_mtx); 87 for (;;) { 88 if (TAILQ_EMPTY(&pd->pd_waitq_req)) { 89 if (nonblock) { 90 error = EWOULDBLOCK; 91 break; 92 } 93 94 error = cv_wait_sig(&pd->pd_waitq_req_cv, &pd->pd_mtx); 95 if (error) 96 break; 97 else 98 continue; 99 } 100 101 putp = TAILQ_FIRST(&pd->pd_waitq_req); 102 TAILQ_REMOVE(&pd->pd_waitq_req, putp, pt_entries); 103 KASSERT(error == 0); 104 break; 105 } 106 mutex_exit(&pd->pd_mtx); 107 108 if (error == 0) { 109 *data = (uint8_t *)putp->pt_pdr; 110 *dlen = putp->pt_pdr->pdr_pth.pth_framelen; 111 *cookie = putp; 112 } 113 114 return error; 115 } 116 117 static void 118 pud_putter_releaseout(void *this, void *cookie, int status) 119 { 120 struct pud_dev *pd = this; 121 struct pud_touser *putp = cookie; 122 123 mutex_enter(&pd->pd_mtx); 124 TAILQ_INSERT_TAIL(&pd->pd_waitq_resp, putp, pt_entries); 125 mutex_exit(&pd->pd_mtx); 126 127 } 128 129 static size_t 130 pud_putter_waitcount(void *this) 131 { 132 struct pud_dev *pd = this; 133 size_t rv; 134 135 mutex_enter(&pd->pd_mtx); 136 rv = pd->pd_waitcount; 137 mutex_exit(&pd->pd_mtx); 138 139 return rv; 140 } 141 142 static int 143 pudop_dev(struct pud_dev *pd, struct pud_req *pdr) 144 { 145 struct putter_hdr *pth = (void *)pdr; 146 struct pud_touser *putp; 147 148 mutex_enter(&pd->pd_mtx); 149 TAILQ_FOREACH(putp, &pd->pd_waitq_resp, pt_entries) 150 if (putp->pt_pdr->pdr_reqid == pdr->pdr_reqid) 151 break; 152 if (putp == NULL) { 153 mutex_exit(&pd->pd_mtx); 154 return EINVAL; 155 } 156 TAILQ_REMOVE(&pd->pd_waitq_resp, putp, pt_entries); 157 mutex_exit(&pd->pd_mtx); 158 159 if (pth->pth_framelen > putp->pt_pdr->pdr_len) { 160 return EINVAL; 161 } 162 memcpy(putp->pt_pdr, pth, pth->pth_framelen); 163 cv_signal(&putp->pt_cv); 164 165 return 0; 166 } 167 168 /* 169 * Register our major number. Always register char device functions, 170 * register block devices optionally. 171 * 172 * XXX: no way to configure "any major you like" currently. 173 */ 174 static int 175 pudconf_reg(struct pud_dev *pd, struct pud_conf_reg *pcr) 176 { 177 struct bdevsw *bsw; 178 int cmajor, bmajor, error; 179 180 cmajor = major(pcr->pm_regdev); 181 if (pcr->pm_flags & PUD_CONFFLAG_BDEV) { 182 bsw = &pud_bdevsw; 183 bmajor = cmajor; 184 } else { 185 bsw = NULL; 186 bmajor = -1; 187 } 188 189 pcr->pm_devname[PUD_DEVNAME_MAX] = '\0'; 190 error = devsw_attach(pcr->pm_devname, bsw, &bmajor, 191 &pud_cdevsw, &cmajor); 192 if (error == 0) 193 pd->pd_dev = pcr->pm_regdev; 194 195 return error; 196 } 197 198 static int 199 pudop_conf(struct pud_dev *pd, struct pud_req *pdr) 200 { 201 int rv; 202 203 switch (pdr->pdr_reqtype) { 204 case PUD_CONF_REG: 205 rv = pudconf_reg(pd, (struct pud_conf_reg *)pdr); 206 break; 207 case PUD_CONF_DEREG: 208 /* unimplemented */ 209 rv = 0; 210 break; 211 case PUD_CONF_IOCTL: 212 /* unimplemented */ 213 rv = 0; 214 break; 215 default: 216 rv = EINVAL; 217 break; 218 } 219 220 return rv; 221 } 222 223 static int 224 pud_putter_dispatch(void *this, struct putter_hdr *pth) 225 { 226 struct pud_dev *pd = this; 227 struct pud_req *pdr = (void *)pth; 228 int rv; 229 230 if (pdr->pdr_pth.pth_framelen < sizeof(struct pud_req)) 231 return EINVAL; 232 233 switch (pdr->pdr_reqclass) { 234 case PUD_REQ_CDEV: 235 case PUD_REQ_BDEV: 236 rv = pudop_dev(pd, pdr); 237 break; 238 case PUD_REQ_CONF: 239 rv = pudop_conf(pd, pdr); 240 break; 241 default: 242 rv = EINVAL; 243 break; 244 } 245 246 return rv; 247 } 248 249 /* Device server severed the umbilical cord */ 250 static int 251 pud_putter_close(void *this) 252 { 253 struct pud_dev *pd = this; 254 struct pud_touser *putp; 255 256 mutex_enter(&pud_mtx); 257 LIST_REMOVE(pd, pd_entries); 258 mutex_exit(&pud_mtx); 259 260 mutex_enter(&pd->pd_mtx); 261 while ((putp = TAILQ_FIRST(&pd->pd_waitq_req)) != NULL) { 262 putp->pt_pdr->pdr_rv = ENXIO; 263 cv_signal(&putp->pt_cv); 264 TAILQ_REMOVE(&pd->pd_waitq_req, putp, pt_entries); 265 } 266 267 while ((putp = TAILQ_FIRST(&pd->pd_waitq_resp)) != NULL) { 268 putp->pt_pdr->pdr_rv = ENXIO; 269 cv_signal(&putp->pt_cv); 270 TAILQ_REMOVE(&pd->pd_waitq_resp, putp, pt_entries); 271 } 272 if (pd->pd_waitcount) 273 cv_wait(&pd->pd_draincv, &pd->pd_mtx); 274 KASSERT(pd->pd_waitcount == 0); 275 276 mutex_exit(&pd->pd_mtx); 277 278 if (pd->pd_dev) 279 devsw_detach(&pud_bdevsw /* XXX */, &pud_cdevsw); 280 281 putter_detach(pd->pd_pi); 282 kmem_free(pd, sizeof(struct pud_dev)); 283 284 return 0; 285 } 286 287 struct pud_dev * 288 pud_dev2pud(dev_t dev) 289 { 290 struct pud_dev *pd; 291 292 mutex_enter(&pud_mtx); 293 LIST_FOREACH(pd, &pudlist, pd_entries) 294 if (major(pd->pd_dev) == major(dev)) 295 break; 296 mutex_exit(&pud_mtx); 297 298 return pd; 299 } 300 301 /* Toss request to the device server and wait for result */ 302 int 303 pud_request(dev_t dev, void *data, size_t dlen, int class, int type) 304 { 305 struct pud_touser put; 306 struct pud_req *pdr = data; 307 struct pud_dev *pd; 308 309 pd = pud_dev2pud(dev); 310 if (pd == NULL) 311 return ENXIO; 312 313 pdr->pdr_dev = dev; 314 pdr->pdr_len = pdr->pdr_pth.pth_framelen = dlen; 315 pdr->pdr_reqid = nextreq(pd); 316 317 pdr->pdr_reqclass = class; 318 pdr->pdr_reqtype = type; 319 320 put.pt_pdr = pdr; 321 cv_init(&put.pt_cv, "pudresp"); 322 323 mutex_enter(&pd->pd_mtx); 324 pd->pd_waitcount++; 325 326 TAILQ_INSERT_TAIL(&pd->pd_waitq_req, &put, pt_entries); 327 putter_notify(pd->pd_pi); 328 cv_broadcast(&pd->pd_waitq_req_cv); 329 cv_wait(&put.pt_cv, &pd->pd_mtx); 330 331 if (--pd->pd_waitcount == 0) 332 cv_signal(&pd->pd_draincv); 333 mutex_exit(&pd->pd_mtx); 334 335 return pdr->pdr_rv; 336 } 337 338 /* Called from putter based on minor dev number */ 339 int 340 pud_config(int fd, int flags, int fmt) 341 { 342 struct pud_dev *pd; 343 344 pd = kmem_zalloc(sizeof(struct pud_dev), KM_SLEEP); 345 pd->pd_pi = putter_attach(curlwp->l_proc->p_pid, fd, pd, &pud_putter); 346 if (pd->pd_pi == NULL) { 347 kmem_free(pd, sizeof(struct pud_dev)); 348 return ENOENT; /* XXX */ 349 } 350 pd->pd_dev = NODEV; 351 352 mutex_init(&pd->pd_mtx, MUTEX_DEFAULT, IPL_NONE); 353 TAILQ_INIT(&pd->pd_waitq_req); 354 TAILQ_INIT(&pd->pd_waitq_resp); 355 cv_init(&pd->pd_waitq_req_cv, "pudreq"); 356 cv_init(&pd->pd_draincv, "pudrain"); 357 358 mutex_enter(&pud_mtx); 359 LIST_INSERT_HEAD(&pudlist, pd, pd_entries); 360 mutex_exit(&pud_mtx); 361 362 return 0; 363 } 364 365 void 366 pudattach() 367 { 368 int error; 369 370 if ((error = putter_register(pud_config, PUTTER_MINOR_PUD)) != 0) { 371 printf("pudattach: can't register to putter: %d\n", error); 372 return; 373 } 374 mutex_init(&pud_mtx, MUTEX_DEFAULT, IPL_NONE); 375 } 376
Indexes created Mon Sep 29 21:09:56 GMT 2025