intr.c revision 1.2.18.4
1 1.2.18.4 yamt /* $NetBSD: intr.c,v 1.2.18.4 2010/08/11 22:55:06 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 1.2.18.4 yamt __KERNEL_RCSID(0, "$NetBSD: intr.c,v 1.2.18.4 2010/08/11 22:55:06 yamt Exp $"); 30 1.2.18.2 yamt 31 1.2 ad #include <sys/param.h> 32 1.2.18.4 yamt #include <sys/atomic.h> 33 1.2 ad #include <sys/cpu.h> 34 1.2.18.4 yamt #include <sys/kernel.h> 35 1.2.18.2 yamt #include <sys/kmem.h> 36 1.2.18.2 yamt #include <sys/kthread.h> 37 1.2.18.4 yamt #include <sys/malloc.h> 38 1.2.18.2 yamt #include <sys/intr.h> 39 1.2.18.4 yamt #include <sys/timetc.h> 40 1.2.18.2 yamt 41 1.2.18.2 yamt #include <rump/rumpuser.h> 42 1.2 ad 43 1.2.18.2 yamt #include "rump_private.h" 44 1.2 ad 45 1.2.18.2 yamt /* 46 1.2.18.2 yamt * Interrupt simulator. It executes hardclock() and softintrs. 47 1.2.18.2 yamt */ 48 1.2.18.2 yamt 49 1.2.18.3 yamt #define SI_MPSAFE 0x01 50 1.2.18.3 yamt #define SI_ONLIST 0x02 51 1.2.18.3 yamt #define SI_KILLME 0x04 52 1.2.18.3 yamt 53 1.2.18.2 yamt struct softint { 54 1.2.18.2 yamt void (*si_func)(void *); 55 1.2.18.2 yamt void *si_arg; 56 1.2.18.3 yamt int si_flags; 57 1.2.18.3 yamt int si_level; 58 1.2.18.2 yamt 59 1.2.18.2 yamt LIST_ENTRY(softint) si_entries; 60 1.2 ad }; 61 1.2 ad 62 1.2.18.3 yamt struct softint_lev { 63 1.2.18.3 yamt struct rumpuser_cv *si_cv; 64 1.2.18.3 yamt LIST_HEAD(, softint) si_pending; 65 1.2.18.3 yamt }; 66 1.2 ad 67 1.2.18.3 yamt kcondvar_t lbolt; /* Oh Kath Ra */ 68 1.2.18.3 yamt 69 1.2.18.4 yamt static u_int ticks; 70 1.2.18.2 yamt 71 1.2.18.4 yamt static u_int 72 1.2.18.4 yamt rumptc_get(struct timecounter *tc) 73 1.2.18.2 yamt { 74 1.2.18.2 yamt 75 1.2.18.4 yamt KASSERT(rump_threads); 76 1.2.18.4 yamt return ticks; 77 1.2.18.2 yamt } 78 1.2.18.2 yamt 79 1.2.18.4 yamt static struct timecounter rumptc = { 80 1.2.18.4 yamt .tc_get_timecount = rumptc_get, 81 1.2.18.4 yamt .tc_poll_pps = NULL, 82 1.2.18.4 yamt .tc_counter_mask = ~0, 83 1.2.18.4 yamt .tc_frequency = 0, 84 1.2.18.4 yamt .tc_name = "rumpclk", 85 1.2.18.4 yamt .tc_quality = 0, 86 1.2.18.4 yamt }; 87 1.2.18.4 yamt 88 1.2.18.2 yamt /* 89 1.2.18.2 yamt * clock "interrupt" 90 1.2.18.2 yamt */ 91 1.2.18.2 yamt static void 92 1.2.18.2 yamt doclock(void *noarg) 93 1.2.18.2 yamt { 94 1.2.18.4 yamt struct timespec clockbase, clockup; 95 1.2.18.4 yamt struct timespec thetick, curtime; 96 1.2.18.4 yamt struct rumpuser_cv *clockcv; 97 1.2.18.4 yamt struct rumpuser_mtx *clockmtx; 98 1.2.18.2 yamt uint64_t sec, nsec; 99 1.2.18.4 yamt int error; 100 1.2.18.2 yamt extern int hz; 101 1.2.18.2 yamt 102 1.2.18.4 yamt memset(&clockup, 0, sizeof(clockup)); 103 1.2.18.2 yamt rumpuser_gettime(&sec, &nsec, &error); 104 1.2.18.2 yamt clockbase.tv_sec = sec; 105 1.2.18.2 yamt clockbase.tv_nsec = nsec; 106 1.2.18.2 yamt curtime = clockbase; 107 1.2.18.4 yamt thetick.tv_sec = 0; 108 1.2.18.4 yamt thetick.tv_nsec = 1000000000/hz; 109 1.2.18.2 yamt 110 1.2.18.4 yamt /* XXX: dummies */ 111 1.2.18.4 yamt rumpuser_cv_init(&clockcv); 112 1.2.18.4 yamt rumpuser_mutex_init(&clockmtx); 113 1.2.18.2 yamt 114 1.2.18.4 yamt rumpuser_mutex_enter(clockmtx); 115 1.2.18.2 yamt for (;;) { 116 1.2.18.2 yamt callout_hardclock(); 117 1.2.18.2 yamt 118 1.2.18.3 yamt /* wait until the next tick. XXX: what if the clock changes? */ 119 1.2.18.3 yamt while (rumpuser_cv_timedwait(clockcv, clockmtx, 120 1.2.18.3 yamt curtime.tv_sec, curtime.tv_nsec) == 0) 121 1.2.18.3 yamt continue; 122 1.2.18.3 yamt 123 1.2.18.4 yamt /* XXX: sync with a) virtual clock b) host clock */ 124 1.2.18.4 yamt timespecadd(&clockup, &clockbase, &curtime); 125 1.2.18.4 yamt timespecadd(&clockup, &thetick, &clockup); 126 1.2.18.4 yamt 127 1.2.18.4 yamt #if 0 128 1.2.18.4 yamt /* CPU_IS_PRIMARY is MD and hence unreliably correct here */ 129 1.2.18.4 yamt if (!CPU_IS_PRIMARY(curcpu())) 130 1.2.18.4 yamt continue; 131 1.2.18.4 yamt #else 132 1.2.18.4 yamt if (curcpu()->ci_index != 0) 133 1.2.18.4 yamt continue; 134 1.2.18.4 yamt #endif 135 1.2.18.4 yamt 136 1.2.18.4 yamt if ((++ticks % hz) == 0) { 137 1.2.18.3 yamt cv_broadcast(&lbolt); 138 1.2.18.2 yamt } 139 1.2.18.4 yamt tc_ticktock(); 140 1.2.18.2 yamt } 141 1.2.18.2 yamt } 142 1.2.18.2 yamt 143 1.2.18.2 yamt /* 144 1.2.18.4 yamt * Soft interrupt execution thread. This thread is pinned to the 145 1.2.18.4 yamt * same CPU that scheduled the interrupt, so we don't need to do 146 1.2.18.4 yamt * lock against si_lvl. 147 1.2.18.2 yamt */ 148 1.2.18.2 yamt static void 149 1.2.18.2 yamt sithread(void *arg) 150 1.2.18.2 yamt { 151 1.2.18.2 yamt struct softint *si; 152 1.2.18.2 yamt void (*func)(void *) = NULL; 153 1.2.18.2 yamt void *funarg; 154 1.2.18.2 yamt bool mpsafe; 155 1.2.18.3 yamt int mylevel = (uintptr_t)arg; 156 1.2.18.3 yamt struct softint_lev *si_lvlp, *si_lvl; 157 1.2.18.3 yamt struct cpu_data *cd = &curcpu()->ci_data; 158 1.2.18.3 yamt 159 1.2.18.3 yamt si_lvlp = cd->cpu_softcpu; 160 1.2.18.3 yamt si_lvl = &si_lvlp[mylevel]; 161 1.2.18.3 yamt 162 1.2.18.2 yamt for (;;) { 163 1.2.18.3 yamt if (!LIST_EMPTY(&si_lvl->si_pending)) { 164 1.2.18.3 yamt si = LIST_FIRST(&si_lvl->si_pending); 165 1.2.18.2 yamt func = si->si_func; 166 1.2.18.2 yamt funarg = si->si_arg; 167 1.2.18.3 yamt mpsafe = si->si_flags & SI_MPSAFE; 168 1.2.18.2 yamt 169 1.2.18.3 yamt si->si_flags &= ~SI_ONLIST; 170 1.2.18.2 yamt LIST_REMOVE(si, si_entries); 171 1.2.18.3 yamt if (si->si_flags & SI_KILLME) { 172 1.2.18.3 yamt softint_disestablish(si); 173 1.2.18.3 yamt continue; 174 1.2.18.3 yamt } 175 1.2.18.2 yamt } else { 176 1.2.18.4 yamt rump_schedlock_cv_wait(si_lvl->si_cv); 177 1.2.18.2 yamt continue; 178 1.2.18.2 yamt } 179 1.2.18.2 yamt 180 1.2.18.2 yamt if (!mpsafe) 181 1.2.18.2 yamt KERNEL_LOCK(1, curlwp); 182 1.2.18.2 yamt func(funarg); 183 1.2.18.2 yamt if (!mpsafe) 184 1.2.18.2 yamt KERNEL_UNLOCK_ONE(curlwp); 185 1.2.18.2 yamt } 186 1.2.18.3 yamt 187 1.2.18.3 yamt panic("sithread unreachable"); 188 1.2.18.2 yamt } 189 1.2.18.2 yamt 190 1.2.18.2 yamt void 191 1.2.18.3 yamt rump_intr_init() 192 1.2.18.2 yamt { 193 1.2.18.2 yamt 194 1.2.18.3 yamt cv_init(&lbolt, "oh kath ra"); 195 1.2.18.3 yamt } 196 1.2.18.2 yamt 197 1.2.18.3 yamt void 198 1.2.18.3 yamt softint_init(struct cpu_info *ci) 199 1.2.18.3 yamt { 200 1.2.18.3 yamt struct cpu_data *cd = &ci->ci_data; 201 1.2.18.3 yamt struct softint_lev *slev; 202 1.2.18.3 yamt int rv, i; 203 1.2.18.3 yamt 204 1.2.18.3 yamt if (!rump_threads) 205 1.2.18.3 yamt return; 206 1.2.18.3 yamt 207 1.2.18.4 yamt /* XXX */ 208 1.2.18.4 yamt if (ci->ci_index == 0) { 209 1.2.18.4 yamt rumptc.tc_frequency = hz; 210 1.2.18.4 yamt tc_init(&rumptc); 211 1.2.18.4 yamt } 212 1.2.18.4 yamt 213 1.2.18.3 yamt slev = kmem_alloc(sizeof(struct softint_lev) * SOFTINT_COUNT, KM_SLEEP); 214 1.2.18.3 yamt for (i = 0; i < SOFTINT_COUNT; i++) { 215 1.2.18.3 yamt rumpuser_cv_init(&slev[i].si_cv); 216 1.2.18.3 yamt LIST_INIT(&slev[i].si_pending); 217 1.2.18.3 yamt } 218 1.2.18.3 yamt cd->cpu_softcpu = slev; 219 1.2.18.3 yamt 220 1.2.18.4 yamt /* softint might run on different physical CPU */ 221 1.2.18.4 yamt membar_sync(); 222 1.2.18.4 yamt 223 1.2.18.3 yamt for (i = 0; i < SOFTINT_COUNT; i++) { 224 1.2.18.3 yamt rv = kthread_create(PRI_NONE, 225 1.2.18.4 yamt KTHREAD_MPSAFE | KTHREAD_INTR, ci, 226 1.2.18.3 yamt sithread, (void *)(uintptr_t)i, 227 1.2.18.4 yamt NULL, "rsi%d/%d", ci->ci_index, i); 228 1.2.18.2 yamt } 229 1.2.18.3 yamt 230 1.2.18.4 yamt rv = kthread_create(PRI_NONE, KTHREAD_MPSAFE, 231 1.2.18.4 yamt ci, doclock, NULL, NULL, "rumpclk%d", ci->ci_index); 232 1.2.18.4 yamt if (rv) 233 1.2.18.4 yamt panic("clock thread creation failed: %d", rv); 234 1.2.18.2 yamt } 235 1.2.18.2 yamt 236 1.2.18.2 yamt /* 237 1.2.18.2 yamt * Soft interrupts bring two choices. If we are running with thread 238 1.2.18.2 yamt * support enabled, defer execution, otherwise execute in place. 239 1.2.18.2 yamt * See softint_schedule(). 240 1.2.18.2 yamt * 241 1.2.18.2 yamt * As there is currently no clear concept of when a thread finishes 242 1.2.18.2 yamt * work (although rump_clear_curlwp() is close), simply execute all 243 1.2.18.2 yamt * softints in the timer thread. This is probably not the most 244 1.2.18.2 yamt * efficient method, but good enough for now. 245 1.2.18.2 yamt */ 246 1.2.18.2 yamt void * 247 1.2.18.2 yamt softint_establish(u_int flags, void (*func)(void *), void *arg) 248 1.2.18.2 yamt { 249 1.2.18.2 yamt struct softint *si; 250 1.2.18.2 yamt 251 1.2.18.4 yamt si = malloc(sizeof(*si), M_TEMP, M_WAITOK); 252 1.2.18.2 yamt si->si_func = func; 253 1.2.18.2 yamt si->si_arg = arg; 254 1.2.18.3 yamt si->si_flags = flags & SOFTINT_MPSAFE ? SI_MPSAFE : 0; 255 1.2.18.3 yamt si->si_level = flags & SOFTINT_LVLMASK; 256 1.2.18.3 yamt KASSERT(si->si_level < SOFTINT_COUNT); 257 1.2.18.2 yamt 258 1.2.18.2 yamt return si; 259 1.2 ad } 260 1.2 ad 261 1.2 ad void 262 1.2 ad softint_schedule(void *arg) 263 1.2 ad { 264 1.2.18.2 yamt struct softint *si = arg; 265 1.2.18.3 yamt struct cpu_data *cd = &curcpu()->ci_data; 266 1.2.18.3 yamt struct softint_lev *si_lvl = cd->cpu_softcpu; 267 1.2 ad 268 1.2.18.2 yamt if (!rump_threads) { 269 1.2.18.2 yamt si->si_func(si->si_arg); 270 1.2.18.2 yamt } else { 271 1.2.18.3 yamt if (!(si->si_flags & SI_ONLIST)) { 272 1.2.18.3 yamt LIST_INSERT_HEAD(&si_lvl[si->si_level].si_pending, 273 1.2.18.3 yamt si, si_entries); 274 1.2.18.3 yamt si->si_flags |= SI_ONLIST; 275 1.2.18.2 yamt } 276 1.2.18.3 yamt } 277 1.2.18.3 yamt } 278 1.2.18.3 yamt 279 1.2.18.3 yamt /* flimsy disestablish: should wait for softints to finish */ 280 1.2.18.3 yamt void 281 1.2.18.3 yamt softint_disestablish(void *cook) 282 1.2.18.3 yamt { 283 1.2.18.3 yamt struct softint *si = cook; 284 1.2.18.3 yamt 285 1.2.18.3 yamt if (si->si_flags & SI_ONLIST) { 286 1.2.18.3 yamt si->si_flags |= SI_KILLME; 287 1.2.18.3 yamt return; 288 1.2.18.3 yamt } 289 1.2.18.4 yamt free(si, M_TEMP); 290 1.2.18.3 yamt } 291 1.2.18.3 yamt 292 1.2.18.3 yamt void 293 1.2.18.3 yamt rump_softint_run(struct cpu_info *ci) 294 1.2.18.3 yamt { 295 1.2.18.3 yamt struct cpu_data *cd = &ci->ci_data; 296 1.2.18.3 yamt struct softint_lev *si_lvl = cd->cpu_softcpu; 297 1.2.18.3 yamt int i; 298 1.2.18.3 yamt 299 1.2.18.3 yamt if (!rump_threads) 300 1.2.18.3 yamt return; 301 1.2.18.3 yamt 302 1.2.18.3 yamt for (i = 0; i < SOFTINT_COUNT; i++) { 303 1.2.18.3 yamt if (!LIST_EMPTY(&si_lvl[i].si_pending)) 304 1.2.18.3 yamt rumpuser_cv_signal(si_lvl[i].si_cv); 305 1.2.18.2 yamt } 306 1.2 ad } 307 1.2 ad 308 1.2 ad bool 309 1.2 ad cpu_intr_p(void) 310 1.2 ad { 311 1.2 ad 312 1.2 ad return false; 313 1.2 ad } 314 1.2.18.3 yamt 315 1.2.18.3 yamt bool 316 1.2.18.3 yamt cpu_softintr_p(void) 317 1.2.18.3 yamt { 318 1.2.18.3 yamt 319 1.2.18.3 yamt return curlwp->l_pflag & LP_INTR; 320 1.2.18.3 yamt } 321
Indexes created Fri Sep 26 20:09:58 GMT 2025