sys/dev/drm/drm_fops.c

   1 /**
   2  * \file drm_fops.c
   3  * File operations for DRM
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Daryll Strauss <daryll@valinux.com>
   7  * \author Gareth Hughes <gareth@valinux.com>
   8  */
   9
  10 /*
  11  * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
  12  *
  13  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  14  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  15  * All Rights Reserved.
  16  *
  17  * Permission is hereby granted, free of charge, to any person obtaining a
  18  * copy of this software and associated documentation files (the "Software"),
  19  * to deal in the Software without restriction, including without limitation
  20  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  21  * and/or sell copies of the Software, and to permit persons to whom the
  22  * Software is furnished to do so, subject to the following conditions:
  23  *
  24  * The above copyright notice and this permission notice (including the next
  25  * paragraph) shall be included in all copies or substantial portions of the
  26  * Software.
  27  *
  28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  29  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  30  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  31  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  32  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  33  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  34  * OTHER DEALINGS IN THE SOFTWARE.
  35  *
  36  * $FreeBSD: src/sys/dev/drm2/drm_fops.c,v 1.1 2012/05/22 11:07:44 kib Exp $
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/conf.h>
  41 #include <sys/devfs.h>
  42
  43 #include <drm/drmP.h>
  44
  45 extern drm_pci_id_list_t *drm_find_description(int vendor, int device,
  46     drm_pci_id_list_t *idlist);
  47 extern devclass_t drm_devclass;
  48
  49 static int drm_setup(struct drm_device *dev)
  50 {
  51         drm_local_map_t *map;
  52         int i;
  53
  54         DRM_LOCK_ASSERT(dev);
  55
  56         /* prebuild the SAREA */
  57         i = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM,
  58             _DRM_CONTAINS_LOCK, &map);
  59         if (i != 0)
  60                 return i;
  61
  62         if (dev->driver->firstopen)
  63                 dev->driver->firstopen(dev);
  64
  65         dev->buf_use = 0;
  66
  67         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
  68                 i = drm_dma_setup(dev);
  69                 if (i != 0)
  70                         return i;
  71         }
  72
  73         for (i = 0; i < DRM_HASH_SIZE; i++) {
  74                 dev->magiclist[i].head = NULL;
  75                 dev->magiclist[i].tail = NULL;
  76         }
  77
  78         init_waitqueue_head(&dev->lock.lock_queue);
  79         if (!drm_core_check_feature(dev, DRIVER_MODESET))
  80                 dev->irq_enabled = 0;
  81         dev->context_flag = 0;
  82         dev->last_context = 0;
  83         dev->if_version = 0;
  84
  85         dev->buf_sigio = NULL;
  86
  87         DRM_DEBUG("\n");
  88
  89         return 0;
  90 }
  91
  92 #define DRIVER_SOFTC(unit) \
  93         ((struct drm_device *)devclass_get_softc(drm_devclass, unit))
  94
  95 int
  96 drm_open(struct dev_open_args *ap)
  97 {
  98         struct cdev *kdev = ap->a_head.a_dev;
  99         int flags = ap->a_oflags;
 100         int fmt = 0;
 101         struct thread *p = curthread;
 102         struct drm_device *dev;
 103         int retcode;
 104
 105         dev = DRIVER_SOFTC(minor(kdev));
 106         if (dev == NULL)
 107                 return (ENXIO);
 108
 109         DRM_DEBUG("open_count = %d\n", dev->open_count);
 110
 111         retcode = drm_open_helper(kdev, flags, fmt, p, dev, ap->a_fp);
 112
 113         if (retcode == 0) {
 114                 atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
 115                 DRM_LOCK(dev);
 116                 device_busy(dev->dev);
 117                 if (!dev->open_count++)
 118                         retcode = drm_setup(dev);
 119                 DRM_UNLOCK(dev);
 120         }
 121
 122         DRM_DEBUG("return %d\n", retcode);
 123
 124         return (retcode);
 125 }
 126
 127 /* drm_open_helper is called whenever a process opens /dev/drm. */
 128 int drm_open_helper(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p,
 129                     struct drm_device *dev, struct file *fp)
 130 {
 131         struct drm_file *priv;
 132         int retcode;
 133
 134         if (flags & O_EXCL)
 135                 return EBUSY; /* No exclusive opens */
 136         dev->flags = flags;
 137
 138         DRM_DEBUG("pid = %d, device = %s\n", DRM_CURRENTPID, devtoname(kdev));
 139
 140         priv = kmalloc(sizeof(*priv), M_DRM, M_WAITOK | M_NULLOK | M_ZERO);
 141         if (priv == NULL) {
 142                 return ENOMEM;
 143         }
 144
 145         DRM_LOCK(dev);
 146         priv->dev               = dev;
 147         priv->uid               = p->td_proc->p_ucred->cr_svuid;
 148         priv->pid               = p->td_proc->p_pid;
 149         priv->ioctl_count       = 0;
 150
 151         /* for compatibility root is always authenticated */
 152         priv->authenticated     = DRM_SUSER(p);
 153
 154         INIT_LIST_HEAD(&priv->fbs);
 155         INIT_LIST_HEAD(&priv->event_list);
 156         init_waitqueue_head(&priv->event_wait);
 157         priv->event_space = 4096; /* set aside 4k for event buffer */
 158
 159         if (dev->driver->driver_features & DRIVER_GEM)
 160                 drm_gem_open(dev, priv);
 161
 162         if (dev->driver->open) {
 163                 /* shared code returns -errno */
 164                 retcode = -dev->driver->open(dev, priv);
 165                 if (retcode != 0) {
 166                         drm_free(priv, M_DRM);
 167                         DRM_UNLOCK(dev);
 168                         return retcode;
 169                 }
 170         }
 171
 172         /* first opener automatically becomes master */
 173         priv->master = list_empty(&dev->filelist);
 174
 175         list_add(&priv->lhead, &dev->filelist);
 176         DRM_UNLOCK(dev);
 177         kdev->si_drv1 = dev;
 178
 179         retcode = devfs_set_cdevpriv(fp, priv, &drm_cdevpriv_dtor);
 180         if (retcode != 0)
 181                 drm_cdevpriv_dtor(priv);
 182
 183         return retcode;
 184 }
 185
 186 /**
 187  * Release file.
 188  *
 189  * \param inode device inode
 190  * \param file_priv DRM file private.
 191  * \return zero on success or a negative number on failure.
 192  *
 193  * If the hardware lock is held then free it, and take it again for the kernel
 194  * context since it's necessary to reclaim buffers. Unlink the file private
 195  * data from its list and free it. Decreases the open count and if it reaches
 196  * zero calls drm_lastclose().
 197  */
 198
 199 #if 0 /* old drm_release equivalent from DragonFly */
 200 void drm_cdevpriv_dtor(void *cd)
 201 {
 202         struct drm_file *file_priv = cd;
 203         struct drm_device *dev = file_priv->dev;
 204         int retcode = 0;
 205
 206         DRM_DEBUG("open_count = %d\n", dev->open_count);
 207
 208         DRM_LOCK(dev);
 209
 210         if (dev->driver->preclose != NULL)
 211                 dev->driver->preclose(dev, file_priv);
 212
 213         /* ========================================================
 214          * Begin inline drm_release
 215          */
 216
 217         DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
 218             DRM_CURRENTPID, (long)dev->dev, dev->open_count);
 219
 220         if (dev->driver->driver_features & DRIVER_GEM)
 221                 drm_gem_release(dev, file_priv);
 222
 223         if (dev->primary->master->lock.hw_lock
 224             && _DRM_LOCK_IS_HELD(dev->primary->master->lock.hw_lock->lock)
 225             && dev->primary->master->lock.file_priv == file_priv) {
 226                 DRM_DEBUG("Process %d dead, freeing lock for context %d\n",
 227                           DRM_CURRENTPID,
 228                           _DRM_LOCKING_CONTEXT(dev->primary->master->lock.hw_lock->lock));
 229                 if (dev->driver->reclaim_buffers_locked != NULL)
 230                         dev->driver->reclaim_buffers_locked(dev, file_priv);
 231
 232                 drm_lock_free(&dev->primary->master->lock,
 233                     _DRM_LOCKING_CONTEXT(dev->primary->master->lock.hw_lock->lock));
 234
 235                                 /* FIXME: may require heavy-handed reset of
 236                                    hardware at this point, possibly
 237                                    processed via a callback to the X
 238                                    server. */
 239         } else if (dev->driver->reclaim_buffers_locked != NULL &&
 240             dev->primary->master->lock.hw_lock != NULL) {
 241                 /* The lock is required to reclaim buffers */
 242                 for (;;) {
 243                         if (!dev->primary->master->lock.hw_lock) {
 244                                 /* Device has been unregistered */
 245                                 retcode = EINTR;
 246                                 break;
 247                         }
 248                         if (drm_lock_take(&dev->primary->master->lock, DRM_KERNEL_CONTEXT)) {
 249                                 dev->primary->master->lock.file_priv = file_priv;
 250                                 dev->primary->master->lock.lock_time = jiffies;
 251                                 atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
 252                                 break;  /* Got lock */
 253                         }
 254                         /* Contention */
 255                         retcode = DRM_LOCK_SLEEP(dev, &dev->primary->master->lock.lock_queue,
 256                             PCATCH, "drmlk2", 0);
 257                         if (retcode)
 258                                 break;
 259                 }
 260                 if (retcode == 0) {
 261                         dev->driver->reclaim_buffers_locked(dev, file_priv);
 262                         drm_lock_free(&dev->primary->master->lock, DRM_KERNEL_CONTEXT);
 263                 }
 264         }
 265
 266         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
 267             !dev->driver->reclaim_buffers_locked)
 268                 drm_reclaim_buffers(dev, file_priv);
 269
 270         funsetown(&dev->buf_sigio);
 271
 272         if (dev->driver->postclose != NULL)
 273                 dev->driver->postclose(dev, file_priv);
 274         list_del(&file_priv->lhead);
 275
 276
 277         /* ========================================================
 278          * End inline drm_release
 279          */
 280
 281         atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
 282         device_unbusy(dev->dev);
 283         if (--dev->open_count == 0) {
 284                 retcode = drm_lastclose(dev);
 285         }
 286
 287         DRM_UNLOCK(dev);
 288 }
 289 #endif
 290
 291 static void drm_unload(struct drm_device *dev)
 292 {
 293         int i;
 294
 295         DRM_DEBUG("\n");
 296
 297         drm_sysctl_cleanup(dev);
 298         if (dev->devnode != NULL)
 299                 destroy_dev(dev->devnode);
 300
 301         drm_ctxbitmap_cleanup(dev);
 302
 303         if (dev->driver->driver_features & DRIVER_GEM)
 304                 drm_gem_destroy(dev);
 305
 306         if (dev->agp && dev->agp->agp_mtrr) {
 307                 int __unused retcode;
 308
 309                 retcode = drm_mtrr_del(0, dev->agp->agp_info.ai_aperture_base,
 310                     dev->agp->agp_info.ai_aperture_size, DRM_MTRR_WC);
 311                 DRM_DEBUG("mtrr_del = %d", retcode);
 312         }
 313
 314         drm_vblank_cleanup(dev);
 315
 316         DRM_LOCK(dev);
 317         drm_lastclose(dev);
 318         DRM_UNLOCK(dev);
 319
 320         /* Clean up PCI resources allocated by drm_bufs.c.  We're not really
 321          * worried about resource consumption while the DRM is inactive (between
 322          * lastclose and firstopen or unload) because these aren't actually
 323          * taking up KVA, just keeping the PCI resource allocated.
 324          */
 325         for (i = 0; i < DRM_MAX_PCI_RESOURCE; i++) {
 326                 if (dev->pcir[i] == NULL)
 327                         continue;
 328                 bus_release_resource(dev->dev, SYS_RES_MEMORY,
 329                     dev->pcirid[i], dev->pcir[i]);
 330                 dev->pcir[i] = NULL;
 331         }
 332
 333         if (dev->agp) {
 334                 drm_free(dev->agp, M_DRM);
 335                 dev->agp = NULL;
 336         }
 337
 338         if (dev->driver->unload != NULL) {
 339                 DRM_LOCK(dev);
 340                 dev->driver->unload(dev);
 341                 DRM_UNLOCK(dev);
 342         }
 343
 344         drm_mem_uninit();
 345
 346         if (pci_disable_busmaster(dev->dev))
 347                 DRM_ERROR("Request to disable bus-master failed.\n");
 348
 349         lockuninit(&dev->vbl_lock);
 350         lockuninit(&dev->dev_lock);
 351         lockuninit(&dev->event_lock);
 352         lockuninit(&dev->struct_mutex);
 353 }
 354
 355 int drm_release(device_t kdev)
 356 {
 357         struct drm_device *dev;
 358
 359         dev = device_get_softc(kdev);
 360         drm_unload(dev);
 361         if (dev->irqr) {
 362                 bus_release_resource(dev->dev, SYS_RES_IRQ, dev->irqrid,
 363                     dev->irqr);
 364                 if (dev->msi_enabled) {
 365                         pci_release_msi(dev->dev);
 366                         DRM_INFO("MSI released\n");
 367                 }
 368         }
 369         return (0);
 370 }
 371
 372 static bool
 373 drm_dequeue_event(struct drm_device *dev, struct drm_file *file_priv,
 374     struct uio *uio, struct drm_pending_event **out)
 375 {
 376         struct drm_pending_event *e;
 377
 378         if (list_empty(&file_priv->event_list))
 379                 return (false);
 380         e = list_first_entry(&file_priv->event_list,
 381             struct drm_pending_event, link);
 382         if (e->event->length > uio->uio_resid)
 383                 return (false);
 384
 385         file_priv->event_space += e->event->length;
 386         list_del(&e->link);
 387         *out = e;
 388         return (true);
 389 }
 390
 391 int
 392 drm_read(struct dev_read_args *ap)
 393 {
 394         struct cdev *kdev = ap->a_head.a_dev;
 395         struct uio *uio = ap->a_uio;
 396         int ioflag = ap->a_ioflag;
 397         struct drm_file *file_priv;
 398         struct drm_device *dev;
 399         struct drm_pending_event *e;
 400         int error;
 401
 402         error = devfs_get_cdevpriv(ap->a_fp, (void **)&file_priv);
 403         if (error != 0) {
 404                 DRM_ERROR("can't find authenticator\n");
 405                 return (EINVAL);
 406         }
 407         dev = drm_get_device_from_kdev(kdev);
 408         lockmgr(&dev->event_lock, LK_EXCLUSIVE);
 409         while (list_empty(&file_priv->event_list)) {
 410                 if ((ioflag & O_NONBLOCK) != 0) {
 411                         error = EAGAIN;
 412                         goto out;
 413                 }
 414                 error = lksleep(&file_priv->event_space, &dev->event_lock,
 415                    PCATCH, "drmrea", 0);
 416                if (error != 0)
 417                        goto out;
 418         }
 419         while (drm_dequeue_event(dev, file_priv, uio, &e)) {
 420                 lockmgr(&dev->event_lock, LK_RELEASE);
 421                 error = uiomove((caddr_t)e->event, e->event->length, uio);
 422                 e->destroy(e);
 423                 if (error != 0)
 424                         return (error);
 425                 lockmgr(&dev->event_lock, LK_EXCLUSIVE);
 426         }
 427 out:
 428         lockmgr(&dev->event_lock, LK_RELEASE);
 429         return (error);
 430 }
 431
 432 void
 433 drm_event_wakeup(struct drm_pending_event *e)
 434 {
 435         struct drm_file *file_priv;
 436         struct drm_device *dev;
 437
 438         file_priv = e->file_priv;
 439         dev = file_priv->dev;
 440         KKASSERT(lockstatus(&dev->event_lock, curthread) != 0);
 441
 442         wakeup(&file_priv->event_space);
 443         KNOTE(&file_priv->dkq.ki_note, 0);
 444 }
 445
 446 static int
 447 drmfilt(struct knote *kn, long hint)
 448 {
 449         struct drm_file *file_priv;
 450         struct drm_device *dev;
 451         int ready = 0;
 452
 453         file_priv = (struct drm_file *)kn->kn_hook;
 454         dev = file_priv->dev;
 455         lockmgr(&dev->event_lock, LK_EXCLUSIVE);
 456         if (!list_empty(&file_priv->event_list))
 457                 ready = 1;
 458         lockmgr(&dev->event_lock, LK_RELEASE);
 459
 460         return (ready);
 461 }
 462
 463 static void
 464 drmfilt_detach(struct knote *kn)
 465 {
 466         struct drm_file *file_priv;
 467         struct drm_device *dev;
 468         struct klist *klist;
 469
 470         file_priv = (struct drm_file *)kn->kn_hook;
 471         dev = file_priv->dev;
 472
 473         lockmgr(&dev->event_lock, LK_EXCLUSIVE);
 474         klist = &file_priv->dkq.ki_note;
 475         knote_remove(klist, kn);
 476         lockmgr(&dev->event_lock, LK_RELEASE);
 477 }
 478
 479 static struct filterops drmfiltops =
 480         { FILTEROP_ISFD, NULL, drmfilt_detach, drmfilt };
 481
 482 int
 483 drm_kqfilter(struct dev_kqfilter_args *ap)
 484 {
 485         struct cdev *kdev = ap->a_head.a_dev;
 486         struct drm_file *file_priv;
 487         struct drm_device *dev;
 488         struct knote *kn = ap->a_kn;
 489         struct klist *klist;
 490         int error;
 491
 492         error = devfs_get_cdevpriv(ap->a_fp, (void **)&file_priv);
 493         if (error != 0) {
 494                 DRM_ERROR("can't find authenticator\n");
 495                 return (EINVAL);
 496         }
 497         dev = drm_get_device_from_kdev(kdev);
 498
 499         ap->a_result = 0;
 500
 501         switch (kn->kn_filter) {
 502         case EVFILT_READ:
 503         case EVFILT_WRITE:
 504                 kn->kn_fop = &drmfiltops;
 505                 kn->kn_hook = (caddr_t)file_priv;
 506                 break;
 507         default:
 508                 ap->a_result = EOPNOTSUPP;
 509                 return (0);
 510         }
 511
 512         lockmgr(&dev->event_lock, LK_EXCLUSIVE);
 513         klist = &file_priv->dkq.ki_note;
 514         knote_insert(klist, kn);
 515         lockmgr(&dev->event_lock, LK_RELEASE);
 516
 517         return (0);
 518 }