| 1 | /* $NetBSD: subr_interrupt.c,v 1.1 2015/08/17 06:16:03 knakahara Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2015 Internet Initiative Japan Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 17 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 18 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 19 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 26 | * POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include <sys/cdefs.h> |
| 30 | __KERNEL_RCSID(0, "$NetBSD: subr_interrupt.c,v 1.1 2015/08/17 06:16:03 knakahara Exp $" ); |
| 31 | |
| 32 | #include <sys/param.h> |
| 33 | #include <sys/systm.h> |
| 34 | #include <sys/kernel.h> |
| 35 | #include <sys/errno.h> |
| 36 | #include <sys/cpu.h> |
| 37 | #include <sys/interrupt.h> |
| 38 | #include <sys/intr.h> |
| 39 | #include <sys/kcpuset.h> |
| 40 | #include <sys/kmem.h> |
| 41 | #include <sys/proc.h> |
| 42 | #include <sys/xcall.h> |
| 43 | #include <sys/sysctl.h> |
| 44 | |
| 45 | #include <sys/conf.h> |
| 46 | #include <sys/intrio.h> |
| 47 | #include <sys/kauth.h> |
| 48 | |
| 49 | #include <machine/limits.h> |
| 50 | |
| 51 | #ifdef INTR_DEBUG |
| 52 | #define DPRINTF(msg) printf msg |
| 53 | #else |
| 54 | #define DPRINTF(msg) |
| 55 | #endif |
| 56 | |
| 57 | static struct intrio_set kintrio_set = { "\0" , NULL, 0 }; |
| 58 | |
| 59 | #define UNSET_NOINTR_SHIELD 0 |
| 60 | #define SET_NOINTR_SHIELD 1 |
| 61 | |
| 62 | static void |
| 63 | interrupt_shield_xcall(void *arg1, void *arg2) |
| 64 | { |
| 65 | struct cpu_info *ci; |
| 66 | struct schedstate_percpu *spc; |
| 67 | int s, shield; |
| 68 | |
| 69 | ci = arg1; |
| 70 | shield = (int)(intptr_t)arg2; |
| 71 | spc = &ci->ci_schedstate; |
| 72 | |
| 73 | s = splsched(); |
| 74 | if (shield == UNSET_NOINTR_SHIELD) |
| 75 | spc->spc_flags &= ~SPCF_NOINTR; |
| 76 | else if (shield == SET_NOINTR_SHIELD) |
| 77 | spc->spc_flags |= SPCF_NOINTR; |
| 78 | splx(s); |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * Change SPCF_NOINTR flag of schedstate_percpu->spc_flags. |
| 83 | */ |
| 84 | static int |
| 85 | interrupt_shield(u_int cpu_idx, int shield) |
| 86 | { |
| 87 | struct cpu_info *ci; |
| 88 | struct schedstate_percpu *spc; |
| 89 | |
| 90 | KASSERT(mutex_owned(&cpu_lock)); |
| 91 | |
| 92 | ci = cpu_lookup(cpu_idx); |
| 93 | if (ci == NULL) |
| 94 | return EINVAL; |
| 95 | |
| 96 | spc = &ci->ci_schedstate; |
| 97 | if (shield == UNSET_NOINTR_SHIELD) { |
| 98 | if ((spc->spc_flags & SPCF_NOINTR) == 0) |
| 99 | return 0; |
| 100 | } else if (shield == SET_NOINTR_SHIELD) { |
| 101 | if ((spc->spc_flags & SPCF_NOINTR) != 0) |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | if (ci == curcpu() || !mp_online) { |
| 106 | interrupt_shield_xcall(ci, (void *)(intptr_t)shield); |
| 107 | } else { |
| 108 | uint64_t where; |
| 109 | where = xc_unicast(0, interrupt_shield_xcall, ci, |
| 110 | (void *)(intptr_t)shield, ci); |
| 111 | xc_wait(where); |
| 112 | } |
| 113 | |
| 114 | spc->spc_lastmod = time_second; |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * Move all assigned interrupts from "cpu_idx" to the other cpu as possible. |
| 120 | * The destination cpu is the lowest cpuid of available cpus. |
| 121 | * If there are no available cpus, give up to move interrupts. |
| 122 | */ |
| 123 | static int |
| 124 | interrupt_avert_intr(u_int cpu_idx) |
| 125 | { |
| 126 | kcpuset_t *cpuset; |
| 127 | struct intrids_handler *ii_handler; |
| 128 | intrid_t *ids; |
| 129 | int error, i, nids; |
| 130 | |
| 131 | kcpuset_create(&cpuset, true); |
| 132 | kcpuset_set(cpuset, cpu_idx); |
| 133 | |
| 134 | ii_handler = interrupt_construct_intrids(cpuset); |
| 135 | if (ii_handler == NULL) { |
| 136 | error = ENOMEM; |
| 137 | goto out; |
| 138 | } |
| 139 | nids = ii_handler->iih_nids; |
| 140 | if (nids == 0) { |
| 141 | error = 0; |
| 142 | goto destruct_out; |
| 143 | } |
| 144 | |
| 145 | interrupt_get_available(cpuset); |
| 146 | kcpuset_clear(cpuset, cpu_idx); |
| 147 | if (kcpuset_iszero(cpuset)) { |
| 148 | DPRINTF(("%s: no available cpu\n" , __func__)); |
| 149 | error = ENOENT; |
| 150 | goto destruct_out; |
| 151 | } |
| 152 | |
| 153 | ids = ii_handler->iih_intrids; |
| 154 | for (i = 0; i < nids; i++) { |
| 155 | error = interrupt_distribute_handler(ids[i], cpuset, NULL); |
| 156 | if (error) |
| 157 | break; |
| 158 | } |
| 159 | |
| 160 | destruct_out: |
| 161 | interrupt_destruct_intrids(ii_handler); |
| 162 | out: |
| 163 | kcpuset_destroy(cpuset); |
| 164 | return error; |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * Return actual intrio_list_line size. |
| 169 | * intrio_list_line size is variable by ncpu. |
| 170 | */ |
| 171 | static size_t |
| 172 | interrupt_intrio_list_line_size(void) |
| 173 | { |
| 174 | |
| 175 | return sizeof(struct intrio_list_line) + |
| 176 | sizeof(struct intrio_list_line_cpu) * (ncpu - 1); |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Return the size of interrupts list data on success. |
| 181 | * Reterun 0 on failed. |
| 182 | */ |
| 183 | static size_t |
| 184 | interrupt_intrio_list_size(void) |
| 185 | { |
| 186 | struct intrids_handler *ii_handler; |
| 187 | size_t ilsize; |
| 188 | |
| 189 | ilsize = 0; |
| 190 | |
| 191 | /* buffer header */ |
| 192 | ilsize += sizeof(struct intrio_list); |
| 193 | |
| 194 | /* il_line body */ |
| 195 | ii_handler = interrupt_construct_intrids(kcpuset_running); |
| 196 | if (ii_handler == NULL) |
| 197 | return 0; |
| 198 | ilsize += interrupt_intrio_list_line_size() * (ii_handler->iih_nids); |
| 199 | |
| 200 | interrupt_destruct_intrids(ii_handler); |
| 201 | return ilsize; |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * Set intrctl list data to "il", and return list structure bytes. |
| 206 | * If error occured, return <0. |
| 207 | * If "data" == NULL, simply return list structure bytes. |
| 208 | */ |
| 209 | static int |
| 210 | interrupt_intrio_list(struct intrio_list *il, int length) |
| 211 | { |
| 212 | struct intrio_list_line *illine; |
| 213 | kcpuset_t *assigned, *avail; |
| 214 | struct intrids_handler *ii_handler; |
| 215 | intrid_t *ids; |
| 216 | size_t ilsize; |
| 217 | u_int cpu_idx; |
| 218 | int nids, intr_idx, ret, line_size; |
| 219 | |
| 220 | ilsize = interrupt_intrio_list_size(); |
| 221 | if (ilsize == 0) |
| 222 | return -ENOMEM; |
| 223 | |
| 224 | if (il == NULL) |
| 225 | return ilsize; |
| 226 | |
| 227 | if (length < ilsize) |
| 228 | return -ENOMEM; |
| 229 | |
| 230 | illine = (struct intrio_list_line *) |
| 231 | ((char *)il + sizeof(struct intrio_list)); |
| 232 | il->il_lineoffset = (off_t)((uintptr_t)illine - (uintptr_t)il); |
| 233 | |
| 234 | kcpuset_create(&avail, true); |
| 235 | interrupt_get_available(avail); |
| 236 | kcpuset_create(&assigned, true); |
| 237 | |
| 238 | ii_handler = interrupt_construct_intrids(kcpuset_running); |
| 239 | if (ii_handler == NULL) { |
| 240 | DPRINTF(("%s: interrupt_construct_intrids() failed\n" , |
| 241 | __func__)); |
| 242 | ret = -ENOMEM; |
| 243 | goto out; |
| 244 | } |
| 245 | |
| 246 | line_size = interrupt_intrio_list_line_size(); |
| 247 | /* ensure interrupts are not added after interrupt_intrio_list_size(). */ |
| 248 | nids = ii_handler->iih_nids; |
| 249 | ids = ii_handler->iih_intrids; |
| 250 | if (ilsize < sizeof(struct intrio_list) + line_size * nids) { |
| 251 | DPRINTF(("%s: interrupts are added during execution.\n" , |
| 252 | __func__)); |
| 253 | ret = -ENOMEM; |
| 254 | goto destruct_out; |
| 255 | } |
| 256 | |
| 257 | for (intr_idx = 0; intr_idx < nids; intr_idx++) { |
| 258 | char devname[INTRDEVNAMEBUF]; |
| 259 | |
| 260 | strncpy(illine->ill_intrid, ids[intr_idx], INTRIDBUF); |
| 261 | interrupt_get_devname(ids[intr_idx], devname, sizeof(devname)); |
| 262 | strncpy(illine->ill_xname, devname, INTRDEVNAMEBUF); |
| 263 | |
| 264 | interrupt_get_assigned(ids[intr_idx], assigned); |
| 265 | for (cpu_idx = 0; cpu_idx < ncpu; cpu_idx++) { |
| 266 | struct intrio_list_line_cpu *illcpu = |
| 267 | &illine->ill_cpu[cpu_idx]; |
| 268 | |
| 269 | illcpu->illc_assigned = |
| 270 | kcpuset_isset(assigned, cpu_idx) ? true : false; |
| 271 | illcpu->illc_count = |
| 272 | interrupt_get_count(ids[intr_idx], cpu_idx); |
| 273 | } |
| 274 | |
| 275 | illine = (struct intrio_list_line *) |
| 276 | ((char *)illine + line_size); |
| 277 | } |
| 278 | |
| 279 | ret = ilsize; |
| 280 | il->il_version = INTRIO_LIST_VERSION; |
| 281 | il->il_ncpus = ncpu; |
| 282 | il->il_nintrs = nids; |
| 283 | il->il_linesize = line_size; |
| 284 | il->il_bufsize = ilsize; |
| 285 | |
| 286 | destruct_out: |
| 287 | interrupt_destruct_intrids(ii_handler); |
| 288 | out: |
| 289 | kcpuset_destroy(assigned); |
| 290 | kcpuset_destroy(avail); |
| 291 | |
| 292 | return ret; |
| 293 | } |
| 294 | |
| 295 | /* |
| 296 | * "intrctl list" entry |
| 297 | */ |
| 298 | static int |
| 299 | interrupt_intrio_list_sysctl(SYSCTLFN_ARGS) |
| 300 | { |
| 301 | int ret, error; |
| 302 | void *buf; |
| 303 | |
| 304 | if (oldlenp == NULL) |
| 305 | return EINVAL; |
| 306 | |
| 307 | /* |
| 308 | * If oldp == NULL, the sysctl(8) caller process want to get the size of |
| 309 | * intrctl list data only. |
| 310 | */ |
| 311 | if (oldp == NULL) { |
| 312 | ret = interrupt_intrio_list(NULL, 0); |
| 313 | if (ret < 0) |
| 314 | return -ret; |
| 315 | |
| 316 | *oldlenp = ret; |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | /* |
| 321 | * If oldp != NULL, the sysctl(8) caller process want to get both the size |
| 322 | * and the contents of intrctl list data. |
| 323 | */ |
| 324 | if (*oldlenp == 0) |
| 325 | return ENOMEM; |
| 326 | |
| 327 | buf = kmem_zalloc(*oldlenp, KM_SLEEP); |
| 328 | if (buf == NULL) |
| 329 | return ENOMEM; |
| 330 | |
| 331 | ret = interrupt_intrio_list(buf, *oldlenp); |
| 332 | if (ret < 0) { |
| 333 | error = -ret; |
| 334 | goto out; |
| 335 | } |
| 336 | error = copyout(buf, oldp, *oldlenp); |
| 337 | |
| 338 | out: |
| 339 | kmem_free(buf, *oldlenp); |
| 340 | return error; |
| 341 | } |
| 342 | |
| 343 | /* |
| 344 | * "intrctl affinity" entry |
| 345 | */ |
| 346 | static int |
| 347 | interrupt_set_affinity_sysctl(SYSCTLFN_ARGS) |
| 348 | { |
| 349 | struct sysctlnode node; |
| 350 | struct intrio_set *iset; |
| 351 | cpuset_t *ucpuset; |
| 352 | kcpuset_t *kcpuset; |
| 353 | int error; |
| 354 | |
| 355 | error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_INTR, |
| 356 | KAUTH_REQ_SYSTEM_INTR_AFFINITY, NULL, NULL, NULL); |
| 357 | if (error) |
| 358 | return EPERM; |
| 359 | |
| 360 | node = *rnode; |
| 361 | iset = (struct intrio_set *)node.sysctl_data; |
| 362 | |
| 363 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 364 | if (error != 0 || newp == NULL) |
| 365 | return error; |
| 366 | |
| 367 | ucpuset = iset->cpuset; |
| 368 | kcpuset_create(&kcpuset, true); |
| 369 | error = kcpuset_copyin(ucpuset, kcpuset, iset->cpuset_size); |
| 370 | if (error) |
| 371 | goto out; |
| 372 | if (kcpuset_iszero(kcpuset)) { |
| 373 | error = EINVAL; |
| 374 | goto out; |
| 375 | } |
| 376 | |
| 377 | error = interrupt_distribute_handler(iset->intrid, kcpuset, NULL); |
| 378 | |
| 379 | out: |
| 380 | kcpuset_destroy(kcpuset); |
| 381 | return error; |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * "intrctl intr" entry |
| 386 | */ |
| 387 | static int |
| 388 | interrupt_intr_sysctl(SYSCTLFN_ARGS) |
| 389 | { |
| 390 | struct sysctlnode node; |
| 391 | struct intrio_set *iset; |
| 392 | cpuset_t *ucpuset; |
| 393 | kcpuset_t *kcpuset; |
| 394 | int error; |
| 395 | u_int cpu_idx; |
| 396 | |
| 397 | error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CPU, |
| 398 | KAUTH_REQ_SYSTEM_CPU_SETSTATE, NULL, NULL, NULL); |
| 399 | if (error) |
| 400 | return EPERM; |
| 401 | |
| 402 | node = *rnode; |
| 403 | iset = (struct intrio_set *)node.sysctl_data; |
| 404 | |
| 405 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 406 | if (error != 0 || newp == NULL) |
| 407 | return error; |
| 408 | |
| 409 | ucpuset = iset->cpuset; |
| 410 | kcpuset_create(&kcpuset, true); |
| 411 | error = kcpuset_copyin(ucpuset, kcpuset, iset->cpuset_size); |
| 412 | if (error) |
| 413 | goto out; |
| 414 | if (kcpuset_iszero(kcpuset)) { |
| 415 | error = EINVAL; |
| 416 | goto out; |
| 417 | } |
| 418 | |
| 419 | cpu_idx = kcpuset_ffs(kcpuset) - 1; /* support one CPU only */ |
| 420 | |
| 421 | mutex_enter(&cpu_lock); |
| 422 | error = interrupt_shield(cpu_idx, UNSET_NOINTR_SHIELD); |
| 423 | mutex_exit(&cpu_lock); |
| 424 | |
| 425 | out: |
| 426 | kcpuset_destroy(kcpuset); |
| 427 | return error; |
| 428 | } |
| 429 | |
| 430 | /* |
| 431 | * "intrctl nointr" entry |
| 432 | */ |
| 433 | static int |
| 434 | interrupt_nointr_sysctl(SYSCTLFN_ARGS) |
| 435 | { |
| 436 | struct sysctlnode node; |
| 437 | struct intrio_set *iset; |
| 438 | cpuset_t *ucpuset; |
| 439 | kcpuset_t *kcpuset; |
| 440 | int error; |
| 441 | u_int cpu_idx; |
| 442 | |
| 443 | error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CPU, |
| 444 | KAUTH_REQ_SYSTEM_CPU_SETSTATE, NULL, NULL, NULL); |
| 445 | if (error) |
| 446 | return EPERM; |
| 447 | |
| 448 | node = *rnode; |
| 449 | iset = (struct intrio_set *)node.sysctl_data; |
| 450 | |
| 451 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 452 | if (error != 0 || newp == NULL) |
| 453 | return error; |
| 454 | |
| 455 | ucpuset = iset->cpuset; |
| 456 | kcpuset_create(&kcpuset, true); |
| 457 | error = kcpuset_copyin(ucpuset, kcpuset, iset->cpuset_size); |
| 458 | if (error) |
| 459 | goto out; |
| 460 | if (kcpuset_iszero(kcpuset)) { |
| 461 | error = EINVAL; |
| 462 | goto out; |
| 463 | } |
| 464 | |
| 465 | cpu_idx = kcpuset_ffs(kcpuset) - 1; /* support one CPU only */ |
| 466 | |
| 467 | mutex_enter(&cpu_lock); |
| 468 | error = interrupt_shield(cpu_idx, SET_NOINTR_SHIELD); |
| 469 | mutex_exit(&cpu_lock); |
| 470 | if (error) |
| 471 | goto out; |
| 472 | |
| 473 | error = interrupt_avert_intr(cpu_idx); |
| 474 | |
| 475 | out: |
| 476 | kcpuset_destroy(kcpuset); |
| 477 | return error; |
| 478 | } |
| 479 | |
| 480 | SYSCTL_SETUP(sysctl_interrupt_setup, "sysctl interrupt setup" ) |
| 481 | { |
| 482 | const struct sysctlnode *node = NULL; |
| 483 | |
| 484 | sysctl_createv(clog, 0, NULL, &node, |
| 485 | CTLFLAG_PERMANENT, CTLTYPE_NODE, |
| 486 | "intr" , SYSCTL_DESCR("Interrupt options" ), |
| 487 | NULL, 0, NULL, 0, |
| 488 | CTL_KERN, CTL_CREATE, CTL_EOL); |
| 489 | |
| 490 | sysctl_createv(clog, 0, &node, NULL, |
| 491 | CTLFLAG_PERMANENT, CTLTYPE_STRUCT, |
| 492 | "list" , SYSCTL_DESCR("intrctl list" ), |
| 493 | interrupt_intrio_list_sysctl, 0, NULL, |
| 494 | 0, CTL_CREATE, CTL_EOL); |
| 495 | |
| 496 | sysctl_createv(clog, 0, &node, NULL, |
| 497 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRUCT, |
| 498 | "affinity" , SYSCTL_DESCR("set affinity" ), |
| 499 | interrupt_set_affinity_sysctl, 0, &kintrio_set, |
| 500 | sizeof(kintrio_set), CTL_CREATE, CTL_EOL); |
| 501 | |
| 502 | sysctl_createv(clog, 0, &node, NULL, |
| 503 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRUCT, |
| 504 | "intr" , SYSCTL_DESCR("set intr" ), |
| 505 | interrupt_intr_sysctl, 0, &kintrio_set, |
| 506 | sizeof(kintrio_set), CTL_CREATE, CTL_EOL); |
| 507 | |
| 508 | sysctl_createv(clog, 0, &node, NULL, |
| 509 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRUCT, |
| 510 | "nointr" , SYSCTL_DESCR("set nointr" ), |
| 511 | interrupt_nointr_sysctl, 0, &kintrio_set, |
| 512 | sizeof(kintrio_set), CTL_CREATE, CTL_EOL); |
| 513 | } |
| 514 | |