| 1 | /*- |
| 2 | * Copyright 2003 Eric Anholt |
| 3 | * All Rights Reserved. |
| 4 | * |
| 5 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 6 | * copy of this software and associated documentation files (the "Software"), |
| 7 | * to deal in the Software without restriction, including without limitation |
| 8 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 9 | * and/or sell copies of the Software, and to permit persons to whom the |
| 10 | * Software is furnished to do so, subject to the following conditions: |
| 11 | * |
| 12 | * The above copyright notice and this permission notice (including the next |
| 13 | * paragraph) shall be included in all copies or substantial portions of the |
| 14 | * Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * ERIC ANHOLT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER |
| 20 | * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 21 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 22 | * |
| 23 | * Authors: |
| 24 | * Eric Anholt <anholt@FreeBSD.org> |
| 25 | * |
| 26 | */ |
| 27 | |
| 28 | /** @file drm_irq.c |
| 29 | * Support code for handling setup/teardown of interrupt handlers and |
| 30 | * handing interrupt handlers off to the drivers. |
| 31 | */ |
| 32 | |
| 33 | #include "dev/drm/drmP.h" |
| 34 | #include "dev/drm/drm.h" |
| 35 | |
| 36 | int drm_irq_by_busid(struct drm_device *dev, void *data, |
| 37 | struct drm_file *file_priv) |
| 38 | { |
| 39 | struct drm_irq_busid *irq = data; |
| 40 | |
| 41 | if ((irq->busnum >> 8) != dev->pci_domain || |
| 42 | (irq->busnum & 0xff) != dev->pci_bus || |
| 43 | irq->devnum != dev->pci_slot || |
| 44 | irq->funcnum != dev->pci_func) |
| 45 | return EINVAL; |
| 46 | |
| 47 | irq->irq = dev->irq; |
| 48 | |
| 49 | DRM_DEBUG("%d:%d:%d => IRQ %d\n", |
| 50 | irq->busnum, irq->devnum, irq->funcnum, irq->irq); |
| 51 | |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | static void vblank_disable_fn(void *arg) |
| 56 | { |
| 57 | struct drm_device *dev = (struct drm_device *)arg; |
| 58 | int i; |
| 59 | |
| 60 | DRM_SPINLOCK(&dev->vbl_lock); |
| 61 | |
| 62 | if (callout_pending(&dev->vblank_disable_timer)) { |
| 63 | /* callout was reset */ |
| 64 | DRM_SPINUNLOCK(&dev->vbl_lock); |
| 65 | return; |
| 66 | } |
| 67 | if (!callout_active(&dev->vblank_disable_timer)) { |
| 68 | /* callout was stopped */ |
| 69 | DRM_SPINUNLOCK(&dev->vbl_lock); |
| 70 | return; |
| 71 | } |
| 72 | callout_deactivate(&dev->vblank_disable_timer); |
| 73 | |
| 74 | DRM_DEBUG("vblank_disable: %s\n", dev->vblank_disable_allowed ? |
| 75 | "allowed" : "denied"); |
| 76 | if (!dev->vblank_disable_allowed) { |
| 77 | DRM_SPINUNLOCK(&dev->vbl_lock); |
| 78 | return; |
| 79 | } |
| 80 | |
| 81 | for (i = 0; i < dev->num_crtcs; i++) { |
| 82 | if (dev->vblank[i].refcount == 0 && |
| 83 | dev->vblank[i].enabled && !dev->vblank[i].inmodeset) { |
| 84 | DRM_DEBUG("disabling vblank on crtc %d\n", i); |
| 85 | dev->vblank[i].last = |
| 86 | dev->driver->get_vblank_counter(dev, i); |
| 87 | dev->driver->disable_vblank(dev, i); |
| 88 | dev->vblank[i].enabled = 0; |
| 89 | } |
| 90 | } |
| 91 | DRM_SPINUNLOCK(&dev->vbl_lock); |
| 92 | } |
| 93 | |
| 94 | void drm_vblank_cleanup(struct drm_device *dev) |
| 95 | { |
| 96 | /* Bail if the driver didn't call drm_vblank_init() */ |
| 97 | if (dev->num_crtcs == 0) |
| 98 | return; |
| 99 | |
| 100 | DRM_SPINLOCK(&dev->vbl_lock); |
| 101 | callout_stop(&dev->vblank_disable_timer); |
| 102 | DRM_SPINUNLOCK(&dev->vbl_lock); |
| 103 | |
| 104 | vblank_disable_fn((void *)dev); |
| 105 | |
| 106 | free(dev->vblank, DRM_MEM_DRIVER); |
| 107 | |
| 108 | dev->num_crtcs = 0; |
| 109 | } |
| 110 | |
| 111 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) |
| 112 | { |
| 113 | int i, ret = ENOMEM; |
| 114 | |
| 115 | callout_init(&dev->vblank_disable_timer); |
| 116 | dev->num_crtcs = num_crtcs; |
| 117 | |
| 118 | dev->vblank = malloc(sizeof(struct drm_vblank_info) * num_crtcs, |
| 119 | DRM_MEM_DRIVER, M_NOWAIT | M_ZERO); |
| 120 | if (!dev->vblank) |
| 121 | goto err; |
| 122 | |
| 123 | DRM_DEBUG("\n"); |
| 124 | |
| 125 | /* Zero per-crtc vblank stuff */ |
| 126 | DRM_SPINLOCK(&dev->vbl_lock); |
| 127 | for (i = 0; i < num_crtcs; i++) { |
| 128 | DRM_INIT_WAITQUEUE(&dev->vblank[i].queue); |
| 129 | dev->vblank[i].refcount = 0; |
| 130 | atomic_set_rel_32(&dev->vblank[i].count, 0); |
| 131 | } |
| 132 | dev->vblank_disable_allowed = 0; |
| 133 | DRM_SPINUNLOCK(&dev->vbl_lock); |
| 134 | |
| 135 | return 0; |
| 136 | |
| 137 | err: |
| 138 | drm_vblank_cleanup(dev); |
| 139 | return ret; |
| 140 | } |
| 141 | |
| 142 | int drm_irq_install(struct drm_device *dev) |
| 143 | { |
| 144 | int crtc, retcode; |
| 145 | |
| 146 | if (dev->irq == 0 || dev->dev_private == NULL) |
| 147 | return EINVAL; |
| 148 | |
| 149 | DRM_DEBUG("irq=%d\n", dev->irq); |
| 150 | |
| 151 | DRM_LOCK(); |
| 152 | if (dev->irq_enabled) { |
| 153 | DRM_UNLOCK(); |
| 154 | return EBUSY; |
| 155 | } |
| 156 | dev->irq_enabled = 1; |
| 157 | |
| 158 | dev->context_flag = 0; |
| 159 | |
| 160 | /* Before installing handler */ |
| 161 | dev->driver->irq_preinstall(dev); |
| 162 | DRM_UNLOCK(); |
| 163 | |
| 164 | /* Install handler */ |
| 165 | retcode = bus_setup_intr(dev->device, dev->irqr, INTR_MPSAFE, |
| 166 | dev->driver->irq_handler, dev, &dev->irqh, |
| 167 | &dev->irq_lock); |
| 168 | if (retcode != 0) |
| 169 | goto err; |
| 170 | |
| 171 | /* After installing handler */ |
| 172 | DRM_LOCK(); |
| 173 | dev->driver->irq_postinstall(dev); |
| 174 | DRM_UNLOCK(); |
| 175 | if (dev->driver->enable_vblank) { |
| 176 | DRM_SPINLOCK(&dev->vbl_lock); |
| 177 | for( crtc = 0 ; crtc < dev->num_crtcs ; crtc++) { |
| 178 | if (dev->driver->enable_vblank(dev, crtc) == 0) { |
| 179 | dev->vblank[crtc].enabled = 1; |
| 180 | } |
| 181 | } |
| 182 | callout_reset(&dev->vblank_disable_timer, 5 * DRM_HZ, |
| 183 | (timeout_t *)vblank_disable_fn, (void *)dev); |
| 184 | DRM_SPINUNLOCK(&dev->vbl_lock); |
| 185 | } |
| 186 | |
| 187 | return 0; |
| 188 | err: |
| 189 | DRM_LOCK(); |
| 190 | dev->irq_enabled = 0; |
| 191 | DRM_UNLOCK(); |
| 192 | |
| 193 | return retcode; |
| 194 | } |
| 195 | |
| 196 | int drm_irq_uninstall(struct drm_device *dev) |
| 197 | { |
| 198 | int crtc; |
| 199 | |
| 200 | if (!dev->irq_enabled) |
| 201 | return EINVAL; |
| 202 | |
| 203 | dev->irq_enabled = 0; |
| 204 | |
| 205 | /* |
| 206 | * Wake up any waiters so they don't hang. |
| 207 | */ |
| 208 | DRM_SPINLOCK(&dev->vbl_lock); |
| 209 | for (crtc = 0; crtc < dev->num_crtcs; crtc++) { |
| 210 | if (dev->vblank[crtc].enabled) { |
| 211 | DRM_WAKEUP(&dev->vblank[crtc].queue); |
| 212 | dev->vblank[crtc].last = |
| 213 | dev->driver->get_vblank_counter(dev, crtc); |
| 214 | dev->vblank[crtc].enabled = 0; |
| 215 | } |
| 216 | } |
| 217 | DRM_SPINUNLOCK(&dev->vbl_lock); |
| 218 | |
| 219 | DRM_DEBUG("irq=%d\n", dev->irq); |
| 220 | |
| 221 | dev->driver->irq_uninstall(dev); |
| 222 | |
| 223 | DRM_UNLOCK(); |
| 224 | bus_teardown_intr(dev->device, dev->irqr, dev->irqh); |
| 225 | DRM_LOCK(); |
| 226 | |
| 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | int drm_control(struct drm_device *dev, void *data, struct drm_file *file_priv) |
| 231 | { |
| 232 | struct drm_control *ctl = data; |
| 233 | int err; |
| 234 | |
| 235 | switch (ctl->func) { |
| 236 | case DRM_INST_HANDLER: |
| 237 | /* Handle drivers whose DRM used to require IRQ setup but the |
| 238 | * no longer does. |
| 239 | */ |
| 240 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| 241 | return 0; |
| 242 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
| 243 | ctl->irq != dev->irq) |
| 244 | return EINVAL; |
| 245 | return drm_irq_install(dev); |
| 246 | case DRM_UNINST_HANDLER: |
| 247 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| 248 | return 0; |
| 249 | DRM_LOCK(); |
| 250 | err = drm_irq_uninstall(dev); |
| 251 | DRM_UNLOCK(); |
| 252 | return err; |
| 253 | default: |
| 254 | return EINVAL; |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | u32 drm_vblank_count(struct drm_device *dev, int crtc) |
| 259 | { |
| 260 | return atomic_load_acq_32(&dev->vblank[crtc].count); |
| 261 | } |
| 262 | |
| 263 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) |
| 264 | { |
| 265 | u32 cur_vblank, diff; |
| 266 | |
| 267 | /* |
| 268 | * Interrupts were disabled prior to this call, so deal with counter |
| 269 | * wrap if needed. |
| 270 | * NOTE! It's possible we lost a full dev->max_vblank_count events |
| 271 | * here if the register is small or we had vblank interrupts off for |
| 272 | * a long time. |
| 273 | */ |
| 274 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); |
| 275 | diff = cur_vblank - dev->vblank[crtc].last; |
| 276 | if (cur_vblank < dev->vblank[crtc].last) { |
| 277 | diff += dev->max_vblank_count; |
| 278 | |
| 279 | DRM_DEBUG("vblank[%d].last=0x%x, cur_vblank=0x%x => diff=0x%x\n", |
| 280 | crtc, dev->vblank[crtc].last, cur_vblank, diff); |
| 281 | } |
| 282 | |
| 283 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", |
| 284 | crtc, diff); |
| 285 | |
| 286 | atomic_add_rel_32(&dev->vblank[crtc].count, diff); |
| 287 | } |
| 288 | |
| 289 | int drm_vblank_get(struct drm_device *dev, int crtc) |
| 290 | { |
| 291 | int ret = 0; |
| 292 | |
| 293 | /* Make sure that we are called with the lock held */ |
| 294 | KKASSERT(lockstatus(&dev->vbl_lock, curthread) != 0); |
| 295 | |
| 296 | /* Going from 0->1 means we have to enable interrupts again */ |
| 297 | if (++dev->vblank[crtc].refcount == 1 && |
| 298 | !dev->vblank[crtc].enabled) { |
| 299 | ret = dev->driver->enable_vblank(dev, crtc); |
| 300 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); |
| 301 | if (ret) |
| 302 | --dev->vblank[crtc].refcount; |
| 303 | else { |
| 304 | dev->vblank[crtc].enabled = 1; |
| 305 | drm_update_vblank_count(dev, crtc); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | if (dev->vblank[crtc].enabled) |
| 310 | dev->vblank[crtc].last = |
| 311 | dev->driver->get_vblank_counter(dev, crtc); |
| 312 | |
| 313 | return ret; |
| 314 | } |
| 315 | |
| 316 | void drm_vblank_put(struct drm_device *dev, int crtc) |
| 317 | { |
| 318 | /* Make sure that we are called with the lock held */ |
| 319 | KKASSERT(lockstatus(&dev->vbl_lock, curthread) != 0); |
| 320 | |
| 321 | KASSERT(dev->vblank[crtc].refcount > 0, |
| 322 | ("invalid refcount")); |
| 323 | |
| 324 | /* Last user schedules interrupt disable */ |
| 325 | if (--dev->vblank[crtc].refcount == 0) |
| 326 | callout_reset(&dev->vblank_disable_timer, 5 * DRM_HZ, |
| 327 | (timeout_t *)vblank_disable_fn, (void *)dev); |
| 328 | } |
| 329 | |
| 330 | int drm_modeset_ctl(struct drm_device *dev, void *data, |
| 331 | struct drm_file *file_priv) |
| 332 | { |
| 333 | struct drm_modeset_ctl *modeset = data; |
| 334 | int crtc, ret = 0; |
| 335 | |
| 336 | /* If drm_vblank_init() hasn't been called yet, just no-op */ |
| 337 | if (!dev->num_crtcs) |
| 338 | goto out; |
| 339 | |
| 340 | crtc = modeset->crtc; |
| 341 | if (crtc >= dev->num_crtcs) { |
| 342 | ret = EINVAL; |
| 343 | goto out; |
| 344 | } |
| 345 | |
| 346 | /* |
| 347 | * To avoid all the problems that might happen if interrupts |
| 348 | * were enabled/disabled around or between these calls, we just |
| 349 | * have the kernel take a reference on the CRTC (just once though |
| 350 | * to avoid corrupting the count if multiple, mismatch calls occur), |
| 351 | * so that interrupts remain enabled in the interim. |
| 352 | */ |
| 353 | switch (modeset->cmd) { |
| 354 | case _DRM_PRE_MODESET: |
| 355 | DRM_DEBUG("pre-modeset, crtc %d\n", crtc); |
| 356 | DRM_SPINLOCK(&dev->vbl_lock); |
| 357 | if (!dev->vblank[crtc].inmodeset) { |
| 358 | dev->vblank[crtc].inmodeset = 0x1; |
| 359 | if (drm_vblank_get(dev, crtc) == 0) |
| 360 | dev->vblank[crtc].inmodeset |= 0x2; |
| 361 | } |
| 362 | DRM_SPINUNLOCK(&dev->vbl_lock); |
| 363 | break; |
| 364 | case _DRM_POST_MODESET: |
| 365 | DRM_DEBUG("post-modeset, crtc %d\n", crtc); |
| 366 | DRM_SPINLOCK(&dev->vbl_lock); |
| 367 | if (dev->vblank[crtc].inmodeset) { |
| 368 | if (dev->vblank[crtc].inmodeset & 0x2) |
| 369 | drm_vblank_put(dev, crtc); |
| 370 | dev->vblank[crtc].inmodeset = 0; |
| 371 | } |
| 372 | dev->vblank_disable_allowed = 1; |
| 373 | DRM_SPINUNLOCK(&dev->vbl_lock); |
| 374 | break; |
| 375 | default: |
| 376 | ret = EINVAL; |
| 377 | break; |
| 378 | } |
| 379 | |
| 380 | out: |
| 381 | return ret; |
| 382 | } |
| 383 | |
| 384 | int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_priv) |
| 385 | { |
| 386 | union drm_wait_vblank *vblwait = data; |
| 387 | unsigned int flags, seq, crtc; |
| 388 | int ret = 0; |
| 389 | |
| 390 | if (!dev->irq_enabled) |
| 391 | return EINVAL; |
| 392 | |
| 393 | if (vblwait->request.type & |
| 394 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) { |
| 395 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
| 396 | vblwait->request.type, |
| 397 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)); |
| 398 | return EINVAL; |
| 399 | } |
| 400 | |
| 401 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
| 402 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
| 403 | |
| 404 | if (crtc >= dev->num_crtcs) |
| 405 | return EINVAL; |
| 406 | |
| 407 | DRM_SPINLOCK(&dev->vbl_lock); |
| 408 | ret = drm_vblank_get(dev, crtc); |
| 409 | DRM_SPINUNLOCK(&dev->vbl_lock); |
| 410 | if (ret) { |
| 411 | DRM_ERROR("failed to acquire vblank counter, %d\n", ret); |
| 412 | return ret; |
| 413 | } |
| 414 | seq = drm_vblank_count(dev, crtc); |
| 415 | |
| 416 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
| 417 | case _DRM_VBLANK_RELATIVE: |
| 418 | vblwait->request.sequence += seq; |
| 419 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; |
| 420 | case _DRM_VBLANK_ABSOLUTE: |
| 421 | break; |
| 422 | default: |
| 423 | ret = EINVAL; |
| 424 | goto done; |
| 425 | } |
| 426 | |
| 427 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
| 428 | (seq - vblwait->request.sequence) <= (1<<23)) { |
| 429 | vblwait->request.sequence = seq + 1; |
| 430 | } |
| 431 | |
| 432 | if (flags & _DRM_VBLANK_SIGNAL) { |
| 433 | /* There have never been any consumers */ |
| 434 | ret = EINVAL; |
| 435 | } else { |
| 436 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
| 437 | vblwait->request.sequence, crtc); |
| 438 | for ( ret = 0 ; !ret && !(((drm_vblank_count(dev, crtc) - |
| 439 | vblwait->request.sequence) <= (1 << 23)) || |
| 440 | !dev->irq_enabled) ; ) { |
| 441 | lwkt_serialize_enter(&dev->irq_lock); |
| 442 | if (!(((drm_vblank_count(dev, crtc) - |
| 443 | vblwait->request.sequence) <= (1 << 23)) || |
| 444 | !dev->irq_enabled)) |
| 445 | ret = zsleep(&dev->vblank[crtc].queue, |
| 446 | &dev->irq_lock, PCATCH, "vblwtq", |
| 447 | DRM_HZ); |
| 448 | lwkt_serialize_exit(&dev->irq_lock); |
| 449 | } |
| 450 | |
| 451 | if (ret != EINTR && ret != ERESTART) { |
| 452 | struct timeval now; |
| 453 | |
| 454 | microtime(&now); |
| 455 | vblwait->reply.tval_sec = now.tv_sec; |
| 456 | vblwait->reply.tval_usec = now.tv_usec; |
| 457 | vblwait->reply.sequence = drm_vblank_count(dev, crtc); |
| 458 | DRM_DEBUG("returning %d to client, irq_enabled %d\n", |
| 459 | vblwait->reply.sequence, dev->irq_enabled); |
| 460 | } else { |
| 461 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | done: |
| 466 | DRM_SPINLOCK(&dev->vbl_lock); |
| 467 | drm_vblank_put(dev, crtc); |
| 468 | DRM_SPINUNLOCK(&dev->vbl_lock); |
| 469 | |
| 470 | return ret; |
| 471 | } |
| 472 | |
| 473 | void drm_handle_vblank(struct drm_device *dev, int crtc) |
| 474 | { |
| 475 | atomic_add_rel_32(&dev->vblank[crtc].count, 1); |
| 476 | DRM_WAKEUP(&dev->vblank[crtc].queue); |
| 477 | } |
| 478 | |