1 /* $NetBSD: intr.c,v 1.40 2013/05/02 21:45:28 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2008-2010 Antti Kantee. All Rights Reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: intr.c,v 1.40 2013/05/02 21:45:28 pooka Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/atomic.h> 33 #include <sys/cpu.h> 34 #include <sys/kernel.h> 35 #include <sys/kmem.h> 36 #include <sys/kthread.h> 37 #include <sys/malloc.h> 38 #include <sys/intr.h> 39 #include <sys/timetc.h> 40 41 #include <rump/rumpuser.h> 42 43 #include "rump_private.h" 44 45 /* 46 * Interrupt simulator. It executes hardclock() and softintrs. 47 */ 48 49 #define SI_MPSAFE 0x01 50 #define SI_KILLME 0x02 51 52 struct softint_percpu; 53 struct softint { 54 void (*si_func)(void *); 55 void *si_arg; 56 int si_flags; 57 int si_level; 58 59 struct softint_percpu *si_entry; /* [0,ncpu-1] */ 60 }; 61 62 struct softint_percpu { 63 struct softint *sip_parent; 64 bool sip_onlist; 65 66 LIST_ENTRY(softint_percpu) sip_entries; 67 }; 68 69 struct softint_lev { 70 struct rumpuser_cv *si_cv; 71 LIST_HEAD(, softint_percpu) si_pending; 72 }; 73 74 kcondvar_t lbolt; /* Oh Kath Ra */ 75 76 static u_int ticks; 77 static int ncpu_final; 78 79 static u_int 80 rumptc_get(struct timecounter *tc) 81 { 82 83 KASSERT(rump_threads); 84 return ticks; 85 } 86 87 static struct timecounter rumptc = { 88 .tc_get_timecount = rumptc_get, 89 .tc_poll_pps = NULL, 90 .tc_counter_mask = ~0, 91 .tc_frequency = 0, 92 .tc_name = "rumpclk", 93 .tc_quality = 0, 94 }; 95 96 /* 97 * clock "interrupt" 98 */ 99 static void 100 doclock(void *noarg) 101 { 102 struct timespec thetick, curclock; 103 int64_t sec; 104 long nsec; 105 int error; 106 extern int hz; 107 108 error = rumpuser_clock_gettime(RUMPUSER_CLOCK_ABSMONO, &sec, &nsec); 109 if (error) 110 panic("clock: cannot get monotonic time"); 111 112 curclock.tv_sec = sec; 113 curclock.tv_nsec = nsec; 114 thetick.tv_sec = 0; 115 thetick.tv_nsec = 1000000000/hz; 116 117 for (;;) { 118 callout_hardclock(); 119 120 error = rumpuser_clock_sleep(RUMPUSER_CLOCK_ABSMONO, 121 curclock.tv_sec, curclock.tv_nsec); 122 KASSERT(!error); 123 timespecadd(&curclock, &thetick, &curclock); 124 125 #if 0 126 /* CPU_IS_PRIMARY is MD and hence unreliably correct here */ 127 if (!CPU_IS_PRIMARY(curcpu())) 128 continue; 129 #else 130 if (curcpu()->ci_index != 0) 131 continue; 132 #endif 133 134 if ((++ticks % hz) == 0) { 135 cv_broadcast(&lbolt); 136 } 137 tc_ticktock(); 138 } 139 } 140 141 /* 142 * Soft interrupt execution thread. This thread is pinned to the 143 * same CPU that scheduled the interrupt, so we don't need to do 144 * lock against si_lvl. 145 */ 146 static void 147 sithread(void *arg) 148 { 149 struct softint_percpu *sip; 150 struct softint *si; 151 void (*func)(void *) = NULL; 152 void *funarg; 153 bool mpsafe; 154 int mylevel = (uintptr_t)arg; 155 struct softint_lev *si_lvlp, *si_lvl; 156 struct cpu_data *cd = &curcpu()->ci_data; 157 158 si_lvlp = cd->cpu_softcpu; 159 si_lvl = &si_lvlp[mylevel]; 160 161 for (;;) { 162 if (!LIST_EMPTY(&si_lvl->si_pending)) { 163 sip = LIST_FIRST(&si_lvl->si_pending); 164 si = sip->sip_parent; 165 166 func = si->si_func; 167 funarg = si->si_arg; 168 mpsafe = si->si_flags & SI_MPSAFE; 169 170 sip->sip_onlist = false; 171 LIST_REMOVE(sip, sip_entries); 172 if (si->si_flags & SI_KILLME) { 173 softint_disestablish(si); 174 continue; 175 } 176 } else { 177 rump_schedlock_cv_wait(si_lvl->si_cv); 178 continue; 179 } 180 181 if (!mpsafe) 182 KERNEL_LOCK(1, curlwp); 183 func(funarg); 184 if (!mpsafe) 185 KERNEL_UNLOCK_ONE(curlwp); 186 } 187 188 panic("sithread unreachable"); 189 } 190 191 void 192 rump_intr_init(int numcpu) 193 { 194 195 cv_init(&lbolt, "oh kath ra"); 196 ncpu_final = numcpu; 197 } 198 199 void 200 softint_init(struct cpu_info *ci) 201 { 202 struct cpu_data *cd = &ci->ci_data; 203 struct softint_lev *slev; 204 int rv, i; 205 206 if (!rump_threads) 207 return; 208 209 /* XXX */ 210 if (ci->ci_index == 0) { 211 rumptc.tc_frequency = hz; 212 tc_init(&rumptc); 213 } 214 215 slev = kmem_alloc(sizeof(struct softint_lev) * SOFTINT_COUNT, KM_SLEEP); 216 for (i = 0; i < SOFTINT_COUNT; i++) { 217 rumpuser_cv_init(&slev[i].si_cv); 218 LIST_INIT(&slev[i].si_pending); 219 } 220 cd->cpu_softcpu = slev; 221 222 /* softint might run on different physical CPU */ 223 membar_sync(); 224 225 for (i = 0; i < SOFTINT_COUNT; i++) { 226 rv = kthread_create(PRI_NONE, 227 KTHREAD_MPSAFE | KTHREAD_INTR, ci, 228 sithread, (void *)(uintptr_t)i, 229 NULL, "rsi%d/%d", ci->ci_index, i); 230 } 231 232 rv = kthread_create(PRI_NONE, KTHREAD_MPSAFE, 233 ci, doclock, NULL, NULL, "rumpclk%d", ci->ci_index); 234 if (rv) 235 panic("clock thread creation failed: %d", rv); 236 } 237 238 void * 239 softint_establish(u_int flags, void (*func)(void *), void *arg) 240 { 241 struct softint *si; 242 struct softint_percpu *sip; 243 int i; 244 245 si = malloc(sizeof(*si), M_TEMP, M_WAITOK); 246 si->si_func = func; 247 si->si_arg = arg; 248 si->si_flags = flags & SOFTINT_MPSAFE ? SI_MPSAFE : 0; 249 si->si_level = flags & SOFTINT_LVLMASK; 250 KASSERT(si->si_level < SOFTINT_COUNT); 251 si->si_entry = malloc(sizeof(*si->si_entry) * ncpu_final, 252 M_TEMP, M_WAITOK | M_ZERO); 253 for (i = 0; i < ncpu_final; i++) { 254 sip = &si->si_entry[i]; 255 sip->sip_parent = si; 256 } 257 258 return si; 259 } 260 261 /* 262 * Soft interrupts bring two choices. If we are running with thread 263 * support enabled, defer execution, otherwise execute in place. 264 */ 265 266 void 267 softint_schedule(void *arg) 268 { 269 struct softint *si = arg; 270 struct softint_percpu *sip = &si->si_entry[curcpu()->ci_index]; 271 struct cpu_data *cd = &curcpu()->ci_data; 272 struct softint_lev *si_lvl = cd->cpu_softcpu; 273 274 if (!rump_threads) { 275 si->si_func(si->si_arg); 276 } else { 277 if (!sip->sip_onlist) { 278 LIST_INSERT_HEAD(&si_lvl[si->si_level].si_pending, 279 sip, sip_entries); 280 sip->sip_onlist = true; 281 } 282 } 283 } 284 285 /* 286 * flimsy disestablish: should wait for softints to finish. 287 */ 288 void 289 softint_disestablish(void *cook) 290 { 291 struct softint *si = cook; 292 int i; 293 294 for (i = 0; i < ncpu_final; i++) { 295 struct softint_percpu *sip; 296 297 sip = &si->si_entry[i]; 298 if (sip->sip_onlist) { 299 si->si_flags |= SI_KILLME; 300 return; 301 } 302 } 303 free(si->si_entry, M_TEMP); 304 free(si, M_TEMP); 305 } 306 307 void 308 rump_softint_run(struct cpu_info *ci) 309 { 310 struct cpu_data *cd = &ci->ci_data; 311 struct softint_lev *si_lvl = cd->cpu_softcpu; 312 int i; 313 314 if (!rump_threads) 315 return; 316 317 for (i = 0; i < SOFTINT_COUNT; i++) { 318 if (!LIST_EMPTY(&si_lvl[i].si_pending)) 319 rumpuser_cv_signal(si_lvl[i].si_cv); 320 } 321 } 322 323 bool 324 cpu_intr_p(void) 325 { 326 327 return false; 328 } 329 330 bool 331 cpu_softintr_p(void) 332 { 333 334 return curlwp->l_pflag & LP_INTR; 335 } 336