pud.c revision 1.2
1 /* $NetBSD: pud.c,v 1.2 2007/11/21 01:31:34 dogcow 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 1.2 2007/11/21 01:31:34 dogcow 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 break; 104 } 105 mutex_exit(&pd->pd_mtx); 106 107 if (error == 0) { 108 *data = (uint8_t *)putp->pt_pdr; 109 *dlen = putp->pt_pdr->pdr_pth.pth_framelen; 110 *cookie = putp; 111 } 112 113 return error; 114 } 115 116 static void 117 pud_putter_releaseout(void *this, void *cookie, int status) 118 { 119 struct pud_dev *pd = this; 120 struct pud_touser *putp = cookie; 121 122 mutex_enter(&pd->pd_mtx); 123 TAILQ_INSERT_TAIL(&pd->pd_waitq_resp, putp, pt_entries); 124 mutex_exit(&pd->pd_mtx); 125 126 } 127 128 static size_t 129 pud_putter_waitcount(void *this) 130 { 131 struct pud_dev *pd = this; 132 size_t rv; 133 134 mutex_enter(&pd->pd_mtx); 135 rv = pd->pd_waitcount; 136 mutex_exit(&pd->pd_mtx); 137 138 return rv; 139 } 140 141 static int 142 pudop_dev(struct pud_dev *pd, struct pud_req *pdr) 143 { 144 struct putter_hdr *pth = (void *)pdr; 145 struct pud_touser *putp; 146 147 mutex_enter(&pd->pd_mtx); 148 TAILQ_FOREACH(putp, &pd->pd_waitq_resp, pt_entries) 149 if (putp->pt_pdr->pdr_reqid == pdr->pdr_reqid) 150 break; 151 if (putp == NULL) { 152 mutex_exit(&pd->pd_mtx); 153 return EINVAL; 154 } 155 TAILQ_REMOVE(&pd->pd_waitq_resp, putp, pt_entries); 156 mutex_exit(&pd->pd_mtx); 157 158 if (pth->pth_framelen > putp->pt_pdr->pdr_len) { 159 return EINVAL; 160 } 161 memcpy(putp->pt_pdr, pth, pth->pth_framelen); 162 cv_signal(&putp->pt_cv); 163 164 return 0; 165 } 166 167 /* 168 * Register our major number. Always register char device functions, 169 * register block devices optionally. 170 * 171 * XXX: no way to configure "any major you like" currently. 172 */ 173 static int 174 pudconf_reg(struct pud_dev *pd, struct pud_conf_reg *pcr) 175 { 176 struct bdevsw *bsw; 177 int cmajor, bmajor, error; 178 179 cmajor = major(pcr->pm_regdev); 180 if (pcr->pm_flags & PUD_CONF_BDEV) { 181 bsw = &pud_bdevsw; 182 bmajor = cmajor; 183 } else { 184 bsw = NULL; 185 bmajor = -1; 186 } 187 188 pcr->pm_devname[PUD_DEVNAME_MAX] = '\0'; 189 error = devsw_attach(pcr->pm_devname, bsw, &bmajor, 190 &pud_cdevsw, &cmajor); 191 if (error == 0) 192 pd->pd_dev = pcr->pm_regdev; 193 194 return error; 195 } 196 197 static int 198 pudop_conf(struct pud_dev *pd, struct pud_req *pdr) 199 { 200 int rv; 201 202 switch (pdr->pdr_reqtype) { 203 case PUD_CONF_REG: 204 rv = pudconf_reg(pd, (struct pud_conf_reg *)pdr); 205 break; 206 case PUD_CONF_DEREG: 207 /* unimplemented */ 208 rv = 0; 209 break; 210 case PUD_CONF_IOCTL: 211 /* unimplemented */ 212 rv = 0; 213 break; 214 default: 215 rv = EINVAL; 216 break; 217 } 218 219 return rv; 220 } 221 222 static int 223 pud_putter_dispatch(void *this, struct putter_hdr *pth) 224 { 225 struct pud_dev *pd = this; 226 struct pud_req *pdr = (void *)pth; 227 int rv; 228 229 if (pdr->pdr_pth.pth_framelen < sizeof(struct pud_req)) 230 return EINVAL; 231 232 switch (pdr->pdr_reqclass) { 233 case PUD_REQ_CDEV: 234 case PUD_REQ_BDEV: 235 rv = pudop_dev(pd, pdr); 236 break; 237 case PUD_REQ_CONF: 238 rv = pudop_conf(pd, pdr); 239 break; 240 default: 241 rv = EINVAL; 242 break; 243 } 244 245 return rv; 246 } 247 248 /* Device server severed the umbilical cord */ 249 static int 250 pud_putter_close(void *this) 251 { 252 struct pud_dev *pd = this; 253 struct pud_touser *putp; 254 255 mutex_enter(&pud_mtx); 256 LIST_REMOVE(pd, pd_entries); 257 mutex_exit(&pud_mtx); 258 259 mutex_enter(&pd->pd_mtx); 260 while ((putp = TAILQ_FIRST(&pd->pd_waitq_req)) != NULL) { 261 putp->pt_pdr->pdr_rv = ENXIO; 262 cv_signal(&putp->pt_cv); 263 TAILQ_REMOVE(&pd->pd_waitq_req, putp, pt_entries); 264 } 265 266 while ((putp = TAILQ_FIRST(&pd->pd_waitq_resp)) != NULL) { 267 putp->pt_pdr->pdr_rv = ENXIO; 268 cv_signal(&putp->pt_cv); 269 TAILQ_REMOVE(&pd->pd_waitq_resp, putp, pt_entries); 270 } 271 if (pd->pd_waitcount) 272 cv_wait(&pd->pd_draincv, &pd->pd_mtx); 273 KASSERT(pd->pd_waitcount == 0); 274 275 mutex_exit(&pd->pd_mtx); 276 277 if (pd->pd_dev) 278 devsw_detach(&pud_bdevsw /* XXX */, &pud_cdevsw); 279 280 putter_detach(pd->pd_pi); 281 kmem_free(pd, sizeof(struct pud_dev)); 282 283 return 0; 284 } 285 286 struct pud_dev * 287 pud_dev2pud(dev_t dev) 288 { 289 struct pud_dev *pd; 290 291 mutex_enter(&pud_mtx); 292 LIST_FOREACH(pd, &pudlist, pd_entries) 293 if (major(pd->pd_dev) == major(dev)) 294 break; 295 mutex_exit(&pud_mtx); 296 297 return pd; 298 } 299 300 /* Toss request to the device server and wait for result */ 301 int 302 pud_request(dev_t dev, void *data, size_t dlen, int class, int type) 303 { 304 struct pud_touser put; 305 struct pud_req *pdr = data; 306 struct pud_dev *pd; 307 308 pd = pud_dev2pud(dev); 309 if (pd == NULL) 310 return ENXIO; 311 312 pdr->pdr_dev = dev; 313 pdr->pdr_len = pdr->pdr_pth.pth_framelen = dlen; 314 pdr->pdr_reqid = nextreq(pd); 315 316 pdr->pdr_reqclass = class; 317 pdr->pdr_reqtype = type; 318 319 put.pt_pdr = pdr; 320 cv_init(&put.pt_cv, "pudresp"); 321 322 mutex_enter(&pd->pd_mtx); 323 pd->pd_waitcount++; 324 325 TAILQ_INSERT_TAIL(&pd->pd_waitq_req, &put, pt_entries); 326 putter_notify(pd->pd_pi); 327 cv_broadcast(&pd->pd_waitq_req_cv); 328 cv_wait(&put.pt_cv, &pd->pd_mtx); 329 330 if (--pd->pd_waitcount == 0) 331 cv_signal(&pd->pd_draincv); 332 mutex_exit(&pd->pd_mtx); 333 334 return pdr->pdr_rv; 335 } 336 337 /* Called from putter based on minor dev number */ 338 int 339 pud_config(int fd, int flags, int fmt) 340 { 341 struct pud_dev *pd; 342 343 pd = kmem_zalloc(sizeof(struct pud_dev), KM_SLEEP); 344 pd->pd_pi = putter_attach(curlwp->l_proc->p_pid, fd, pd, &pud_putter); 345 if (pd->pd_pi == NULL) { 346 kmem_free(pd, sizeof(struct pud_dev)); 347 return ENOENT; /* XXX */ 348 } 349 pd->pd_dev = NODEV; 350 351 mutex_init(&pd->pd_mtx, MUTEX_DEFAULT, IPL_NONE); 352 TAILQ_INIT(&pd->pd_waitq_req); 353 TAILQ_INIT(&pd->pd_waitq_resp); 354 cv_init(&pd->pd_waitq_req_cv, "pudreq"); 355 cv_init(&pd->pd_draincv, "pudrain"); 356 357 mutex_enter(&pud_mtx); 358 LIST_INSERT_HEAD(&pudlist, pd, pd_entries); 359 mutex_exit(&pud_mtx); 360 361 return 0; 362 } 363 364 void 365 pudattach() 366 { 367 int error; 368 369 if ((error = putter_register(pud_config, PUTTER_MINOR_PUD)) != 0) { 370 printf("pudattach: can't register to putter: %d\n", error); 371 return; 372 } 373 mutex_init(&pud_mtx, MUTEX_DEFAULT, IPL_NONE); 374 } 375
Indexes created Mon Sep 29 21:09:56 GMT 2025