intr.c revision 1.2.18.3
1 1.2.18.3 yamt /* $NetBSD: intr.c,v 1.2.18.3 2010/03/11 15:04:38 yamt Exp $ */ 2 1.2 ad 3 1.2.18.2 yamt /* 4 1.2.18.2 yamt * Copyright (c) 2008 Antti Kantee. All Rights Reserved. 5 1.2 ad * 6 1.2 ad * Redistribution and use in source and binary forms, with or without 7 1.2 ad * modification, are permitted provided that the following conditions 8 1.2 ad * are met: 9 1.2 ad * 1. Redistributions of source code must retain the above copyright 10 1.2 ad * notice, this list of conditions and the following disclaimer. 11 1.2 ad * 2. Redistributions in binary form must reproduce the above copyright 12 1.2 ad * notice, this list of conditions and the following disclaimer in the 13 1.2 ad * documentation and/or other materials provided with the distribution. 14 1.2 ad * 15 1.2.18.2 yamt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 1.2.18.2 yamt * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 1.2.18.2 yamt * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 1.2.18.2 yamt * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 1.2.18.2 yamt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 1.2.18.2 yamt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 1.2.18.2 yamt * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 1.2.18.2 yamt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 1.2.18.2 yamt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 1.2.18.2 yamt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 1.2.18.2 yamt * SUCH DAMAGE. 26 1.2 ad */ 27 1.2 ad 28 1.2.18.2 yamt #include <sys/cdefs.h> 29 1.2.18.3 yamt __KERNEL_RCSID(0, "$NetBSD: intr.c,v 1.2.18.3 2010/03/11 15:04:38 yamt Exp $"); 30 1.2.18.2 yamt 31 1.2 ad #include <sys/param.h> 32 1.2 ad #include <sys/cpu.h> 33 1.2.18.2 yamt #include <sys/kmem.h> 34 1.2.18.2 yamt #include <sys/kthread.h> 35 1.2.18.2 yamt #include <sys/intr.h> 36 1.2.18.2 yamt 37 1.2.18.2 yamt #include <rump/rumpuser.h> 38 1.2 ad 39 1.2.18.2 yamt #include "rump_private.h" 40 1.2 ad 41 1.2.18.2 yamt /* 42 1.2.18.2 yamt * Interrupt simulator. It executes hardclock() and softintrs. 43 1.2.18.2 yamt */ 44 1.2.18.2 yamt 45 1.2.18.2 yamt time_t time_uptime = 0; 46 1.2.18.2 yamt 47 1.2.18.3 yamt #define SI_MPSAFE 0x01 48 1.2.18.3 yamt #define SI_ONLIST 0x02 49 1.2.18.3 yamt #define SI_KILLME 0x04 50 1.2.18.3 yamt 51 1.2.18.2 yamt struct softint { 52 1.2.18.2 yamt void (*si_func)(void *); 53 1.2.18.2 yamt void *si_arg; 54 1.2.18.3 yamt int si_flags; 55 1.2.18.3 yamt int si_level; 56 1.2.18.2 yamt 57 1.2.18.2 yamt LIST_ENTRY(softint) si_entries; 58 1.2 ad }; 59 1.2 ad 60 1.2.18.3 yamt static struct rumpuser_mtx *si_mtx; 61 1.2.18.3 yamt struct softint_lev { 62 1.2.18.3 yamt struct rumpuser_cv *si_cv; 63 1.2.18.3 yamt LIST_HEAD(, softint) si_pending; 64 1.2.18.3 yamt }; 65 1.2 ad 66 1.2.18.2 yamt /* rumpuser structures since we call rumpuser interfaces directly */ 67 1.2.18.2 yamt static struct rumpuser_cv *clockcv; 68 1.2.18.2 yamt static struct rumpuser_mtx *clockmtx; 69 1.2.18.2 yamt static struct timespec clockbase, clockup; 70 1.2.18.2 yamt static unsigned clkgen; 71 1.2.18.2 yamt 72 1.2.18.3 yamt kcondvar_t lbolt; /* Oh Kath Ra */ 73 1.2.18.3 yamt 74 1.2 ad void 75 1.2.18.2 yamt rump_getuptime(struct timespec *ts) 76 1.2 ad { 77 1.2.18.2 yamt int startgen, i = 0; 78 1.2 ad 79 1.2.18.2 yamt do { 80 1.2.18.2 yamt startgen = clkgen; 81 1.2.18.2 yamt if (__predict_false(i++ > 10)) { 82 1.2.18.2 yamt yield(); 83 1.2.18.2 yamt i = 0; 84 1.2.18.2 yamt } 85 1.2.18.2 yamt *ts = clockup; 86 1.2.18.2 yamt } while (startgen != clkgen || clkgen % 2 != 0); 87 1.2.18.2 yamt } 88 1.2.18.2 yamt 89 1.2.18.2 yamt void 90 1.2.18.2 yamt rump_gettime(struct timespec *ts) 91 1.2.18.2 yamt { 92 1.2.18.2 yamt struct timespec ts_up; 93 1.2.18.2 yamt 94 1.2.18.2 yamt rump_getuptime(&ts_up); 95 1.2.18.2 yamt timespecadd(&clockbase, &ts_up, ts); 96 1.2.18.2 yamt } 97 1.2.18.2 yamt 98 1.2.18.2 yamt /* 99 1.2.18.2 yamt * clock "interrupt" 100 1.2.18.2 yamt */ 101 1.2.18.2 yamt static void 102 1.2.18.2 yamt doclock(void *noarg) 103 1.2.18.2 yamt { 104 1.2.18.2 yamt struct timespec tick, curtime; 105 1.2.18.2 yamt uint64_t sec, nsec; 106 1.2.18.2 yamt int ticks = 0, error; 107 1.2.18.2 yamt extern int hz; 108 1.2.18.2 yamt 109 1.2.18.2 yamt rumpuser_gettime(&sec, &nsec, &error); 110 1.2.18.2 yamt clockbase.tv_sec = sec; 111 1.2.18.2 yamt clockbase.tv_nsec = nsec; 112 1.2.18.2 yamt curtime = clockbase; 113 1.2.18.2 yamt tick.tv_sec = 0; 114 1.2.18.2 yamt tick.tv_nsec = 1000000000/hz; 115 1.2.18.2 yamt 116 1.2.18.2 yamt rumpuser_mutex_enter(clockmtx); 117 1.2.18.2 yamt rumpuser_cv_signal(clockcv); 118 1.2.18.2 yamt 119 1.2.18.2 yamt for (;;) { 120 1.2.18.2 yamt callout_hardclock(); 121 1.2.18.2 yamt 122 1.2.18.3 yamt /* wait until the next tick. XXX: what if the clock changes? */ 123 1.2.18.3 yamt while (rumpuser_cv_timedwait(clockcv, clockmtx, 124 1.2.18.3 yamt curtime.tv_sec, curtime.tv_nsec) == 0) 125 1.2.18.3 yamt continue; 126 1.2.18.3 yamt 127 1.2.18.3 yamt /* if !maincpu: continue */ 128 1.2.18.3 yamt 129 1.2.18.2 yamt if (++ticks == hz) { 130 1.2.18.2 yamt time_uptime++; 131 1.2.18.2 yamt ticks = 0; 132 1.2.18.3 yamt cv_broadcast(&lbolt); 133 1.2.18.2 yamt } 134 1.2.18.2 yamt 135 1.2.18.2 yamt clkgen++; 136 1.2.18.2 yamt timespecadd(&clockup, &tick, &clockup); 137 1.2.18.2 yamt clkgen++; 138 1.2.18.2 yamt timespecadd(&clockup, &clockbase, &curtime); 139 1.2.18.2 yamt } 140 1.2.18.2 yamt } 141 1.2.18.2 yamt 142 1.2.18.2 yamt /* 143 1.2.18.3 yamt * Soft interrupt execution thread. Note that we run without a CPU 144 1.2.18.3 yamt * context until we start processing the interrupt. This is to avoid 145 1.2.18.3 yamt * lock recursion. 146 1.2.18.2 yamt */ 147 1.2.18.2 yamt static void 148 1.2.18.2 yamt sithread(void *arg) 149 1.2.18.2 yamt { 150 1.2.18.2 yamt struct softint *si; 151 1.2.18.2 yamt void (*func)(void *) = NULL; 152 1.2.18.2 yamt void *funarg; 153 1.2.18.2 yamt bool mpsafe; 154 1.2.18.3 yamt int mylevel = (uintptr_t)arg; 155 1.2.18.3 yamt struct softint_lev *si_lvlp, *si_lvl; 156 1.2.18.3 yamt struct cpu_data *cd = &curcpu()->ci_data; 157 1.2.18.3 yamt 158 1.2.18.3 yamt rump_unschedule(); 159 1.2.18.3 yamt 160 1.2.18.3 yamt si_lvlp = cd->cpu_softcpu; 161 1.2.18.3 yamt si_lvl = &si_lvlp[mylevel]; 162 1.2.18.3 yamt 163 1.2.18.3 yamt /* 164 1.2.18.3 yamt * XXX: si_mtx is unnecessary, and should open an interface 165 1.2.18.3 yamt * which allows to use schedmtx for the cv wait 166 1.2.18.3 yamt */ 167 1.2.18.3 yamt rumpuser_mutex_enter_nowrap(si_mtx); 168 1.2.18.2 yamt for (;;) { 169 1.2.18.3 yamt if (!LIST_EMPTY(&si_lvl->si_pending)) { 170 1.2.18.3 yamt si = LIST_FIRST(&si_lvl->si_pending); 171 1.2.18.2 yamt func = si->si_func; 172 1.2.18.2 yamt funarg = si->si_arg; 173 1.2.18.3 yamt mpsafe = si->si_flags & SI_MPSAFE; 174 1.2.18.2 yamt 175 1.2.18.3 yamt si->si_flags &= ~SI_ONLIST; 176 1.2.18.2 yamt LIST_REMOVE(si, si_entries); 177 1.2.18.3 yamt if (si->si_flags & SI_KILLME) { 178 1.2.18.3 yamt rumpuser_mutex_exit(si_mtx); 179 1.2.18.3 yamt rump_schedule(); 180 1.2.18.3 yamt softint_disestablish(si); 181 1.2.18.3 yamt rump_unschedule(); 182 1.2.18.3 yamt rumpuser_mutex_enter_nowrap(si_mtx); 183 1.2.18.3 yamt continue; 184 1.2.18.3 yamt } 185 1.2.18.2 yamt } else { 186 1.2.18.3 yamt rumpuser_cv_wait_nowrap(si_lvl->si_cv, si_mtx); 187 1.2.18.2 yamt continue; 188 1.2.18.2 yamt } 189 1.2.18.3 yamt rumpuser_mutex_exit(si_mtx); 190 1.2.18.2 yamt 191 1.2.18.3 yamt rump_schedule(); 192 1.2.18.2 yamt if (!mpsafe) 193 1.2.18.2 yamt KERNEL_LOCK(1, curlwp); 194 1.2.18.2 yamt func(funarg); 195 1.2.18.2 yamt if (!mpsafe) 196 1.2.18.2 yamt KERNEL_UNLOCK_ONE(curlwp); 197 1.2.18.3 yamt rump_unschedule(); 198 1.2.18.2 yamt 199 1.2.18.3 yamt rumpuser_mutex_enter_nowrap(si_mtx); 200 1.2.18.2 yamt } 201 1.2.18.3 yamt 202 1.2.18.3 yamt panic("sithread unreachable"); 203 1.2.18.2 yamt } 204 1.2.18.2 yamt 205 1.2.18.2 yamt void 206 1.2.18.3 yamt rump_intr_init() 207 1.2.18.2 yamt { 208 1.2.18.2 yamt 209 1.2.18.3 yamt rumpuser_mutex_init(&si_mtx); 210 1.2.18.2 yamt rumpuser_cv_init(&clockcv); 211 1.2.18.2 yamt rumpuser_mutex_init(&clockmtx); 212 1.2.18.3 yamt cv_init(&lbolt, "oh kath ra"); 213 1.2.18.3 yamt } 214 1.2.18.2 yamt 215 1.2.18.3 yamt void 216 1.2.18.3 yamt softint_init(struct cpu_info *ci) 217 1.2.18.3 yamt { 218 1.2.18.3 yamt struct cpu_data *cd = &ci->ci_data; 219 1.2.18.3 yamt struct softint_lev *slev; 220 1.2.18.3 yamt int rv, i; 221 1.2.18.3 yamt 222 1.2.18.3 yamt if (!rump_threads) 223 1.2.18.3 yamt return; 224 1.2.18.3 yamt 225 1.2.18.3 yamt slev = kmem_alloc(sizeof(struct softint_lev) * SOFTINT_COUNT, KM_SLEEP); 226 1.2.18.3 yamt for (i = 0; i < SOFTINT_COUNT; i++) { 227 1.2.18.3 yamt rumpuser_cv_init(&slev[i].si_cv); 228 1.2.18.3 yamt LIST_INIT(&slev[i].si_pending); 229 1.2.18.3 yamt } 230 1.2.18.3 yamt cd->cpu_softcpu = slev; 231 1.2.18.3 yamt 232 1.2.18.3 yamt for (i = 0; i < SOFTINT_COUNT; i++) { 233 1.2.18.3 yamt rv = kthread_create(PRI_NONE, 234 1.2.18.3 yamt KTHREAD_MPSAFE | KTHREAD_INTR, NULL, 235 1.2.18.3 yamt sithread, (void *)(uintptr_t)i, 236 1.2.18.3 yamt NULL, "rumpsi%d", i); 237 1.2.18.3 yamt } 238 1.2.18.3 yamt 239 1.2.18.3 yamt rumpuser_mutex_enter(clockmtx); 240 1.2.18.3 yamt for (i = 0; i < ncpu; i++) { 241 1.2.18.3 yamt rv = kthread_create(PRI_NONE, 242 1.2.18.3 yamt KTHREAD_MPSAFE | KTHREAD_INTR, 243 1.2.18.3 yamt cpu_lookup(i), doclock, NULL, NULL, 244 1.2.18.3 yamt "rumpclk%d", i); 245 1.2.18.2 yamt if (rv) 246 1.2.18.2 yamt panic("clock thread creation failed: %d", rv); 247 1.2.18.2 yamt } 248 1.2.18.3 yamt 249 1.2.18.3 yamt /* 250 1.2.18.3 yamt * Make sure we have a clocktime before returning. 251 1.2.18.3 yamt * XXX: mp 252 1.2.18.3 yamt */ 253 1.2.18.3 yamt rumpuser_cv_wait(clockcv, clockmtx); 254 1.2.18.3 yamt rumpuser_mutex_exit(clockmtx); 255 1.2.18.2 yamt } 256 1.2.18.2 yamt 257 1.2.18.2 yamt /* 258 1.2.18.2 yamt * Soft interrupts bring two choices. If we are running with thread 259 1.2.18.2 yamt * support enabled, defer execution, otherwise execute in place. 260 1.2.18.2 yamt * See softint_schedule(). 261 1.2.18.2 yamt * 262 1.2.18.2 yamt * As there is currently no clear concept of when a thread finishes 263 1.2.18.2 yamt * work (although rump_clear_curlwp() is close), simply execute all 264 1.2.18.2 yamt * softints in the timer thread. This is probably not the most 265 1.2.18.2 yamt * efficient method, but good enough for now. 266 1.2.18.2 yamt */ 267 1.2.18.2 yamt void * 268 1.2.18.2 yamt softint_establish(u_int flags, void (*func)(void *), void *arg) 269 1.2.18.2 yamt { 270 1.2.18.2 yamt struct softint *si; 271 1.2.18.2 yamt 272 1.2.18.2 yamt si = kmem_alloc(sizeof(*si), KM_SLEEP); 273 1.2.18.2 yamt si->si_func = func; 274 1.2.18.2 yamt si->si_arg = arg; 275 1.2.18.3 yamt si->si_flags = flags & SOFTINT_MPSAFE ? SI_MPSAFE : 0; 276 1.2.18.3 yamt si->si_level = flags & SOFTINT_LVLMASK; 277 1.2.18.3 yamt KASSERT(si->si_level < SOFTINT_COUNT); 278 1.2.18.2 yamt 279 1.2.18.2 yamt return si; 280 1.2 ad } 281 1.2 ad 282 1.2 ad void 283 1.2 ad softint_schedule(void *arg) 284 1.2 ad { 285 1.2.18.2 yamt struct softint *si = arg; 286 1.2.18.3 yamt struct cpu_data *cd = &curcpu()->ci_data; 287 1.2.18.3 yamt struct softint_lev *si_lvl = cd->cpu_softcpu; 288 1.2 ad 289 1.2.18.2 yamt if (!rump_threads) { 290 1.2.18.2 yamt si->si_func(si->si_arg); 291 1.2.18.2 yamt } else { 292 1.2.18.3 yamt if (!(si->si_flags & SI_ONLIST)) { 293 1.2.18.3 yamt LIST_INSERT_HEAD(&si_lvl[si->si_level].si_pending, 294 1.2.18.3 yamt si, si_entries); 295 1.2.18.3 yamt si->si_flags |= SI_ONLIST; 296 1.2.18.2 yamt } 297 1.2.18.3 yamt } 298 1.2.18.3 yamt } 299 1.2.18.3 yamt 300 1.2.18.3 yamt /* flimsy disestablish: should wait for softints to finish */ 301 1.2.18.3 yamt void 302 1.2.18.3 yamt softint_disestablish(void *cook) 303 1.2.18.3 yamt { 304 1.2.18.3 yamt struct softint *si = cook; 305 1.2.18.3 yamt 306 1.2.18.3 yamt rumpuser_mutex_enter(si_mtx); 307 1.2.18.3 yamt if (si->si_flags & SI_ONLIST) { 308 1.2.18.3 yamt si->si_flags |= SI_KILLME; 309 1.2.18.3 yamt return; 310 1.2.18.3 yamt } 311 1.2.18.3 yamt rumpuser_mutex_exit(si_mtx); 312 1.2.18.3 yamt kmem_free(si, sizeof(*si)); 313 1.2.18.3 yamt } 314 1.2.18.3 yamt 315 1.2.18.3 yamt void 316 1.2.18.3 yamt rump_softint_run(struct cpu_info *ci) 317 1.2.18.3 yamt { 318 1.2.18.3 yamt struct cpu_data *cd = &ci->ci_data; 319 1.2.18.3 yamt struct softint_lev *si_lvl = cd->cpu_softcpu; 320 1.2.18.3 yamt int i; 321 1.2.18.3 yamt 322 1.2.18.3 yamt if (!rump_threads) 323 1.2.18.3 yamt return; 324 1.2.18.3 yamt 325 1.2.18.3 yamt for (i = 0; i < SOFTINT_COUNT; i++) { 326 1.2.18.3 yamt if (!LIST_EMPTY(&si_lvl[i].si_pending)) 327 1.2.18.3 yamt rumpuser_cv_signal(si_lvl[i].si_cv); 328 1.2.18.2 yamt } 329 1.2 ad } 330 1.2 ad 331 1.2 ad bool 332 1.2 ad cpu_intr_p(void) 333 1.2 ad { 334 1.2 ad 335 1.2 ad return false; 336 1.2 ad } 337 1.2.18.3 yamt 338 1.2.18.3 yamt bool 339 1.2.18.3 yamt cpu_softintr_p(void) 340 1.2.18.3 yamt { 341 1.2.18.3 yamt 342 1.2.18.3 yamt return curlwp->l_pflag & LP_INTR; 343 1.2.18.3 yamt } 344
Indexes created Thu Sep 25 16:09:42 GMT 2025