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
  37 #include <sys/types.h>
  38 #include <sys/conf.h>
  39 #include <sys/devfs.h>
  40
  41 #include <drm/drmP.h>
  42 #include <linux/module.h>
  43 #include "drm_legacy.h"
  44
  45 /* from BKL pushdown: note that nothing else serializes idr_find() */
  46 DEFINE_MUTEX(drm_global_mutex);
  47 EXPORT_SYMBOL(drm_global_mutex);
  48
  49 extern drm_pci_id_list_t *drm_find_description(int vendor, int device,
  50     drm_pci_id_list_t *idlist);
  51 extern devclass_t drm_devclass;
  52
  53 static int drm_setup(struct drm_device *dev)
  54 {
  55         drm_local_map_t *map;
  56         int i;
  57
  58         DRM_LOCK_ASSERT(dev);
  59
  60         /* prebuild the SAREA */
  61         i = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM,
  62             _DRM_CONTAINS_LOCK, &map);
  63         if (i != 0)
  64                 return i;
  65
  66         if (dev->driver->firstopen)
  67                 dev->driver->firstopen(dev);
  68
  69         dev->buf_use = 0;
  70
  71         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
  72                 i = drm_dma_setup(dev);
  73                 if (i != 0)
  74                         return i;
  75         }
  76
  77         drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER);
  78         INIT_LIST_HEAD(&dev->magicfree);
  79
  80         init_waitqueue_head(&dev->lock.lock_queue);
  81         if (!drm_core_check_feature(dev, DRIVER_MODESET))
  82                 dev->irq_enabled = 0;
  83         dev->context_flag = 0;
  84         dev->last_context = 0;
  85         dev->if_version = 0;
  86
  87         dev->buf_sigio = NULL;
  88
  89         DRM_DEBUG("\n");
  90
  91         return 0;
  92 }
  93
  94 #define DRIVER_SOFTC(unit) \
  95         ((struct drm_device *)devclass_get_softc(drm_devclass, unit))
  96
  97 int
  98 drm_open(struct dev_open_args *ap)
  99 {
 100         struct cdev *kdev = ap->a_head.a_dev;
 101         int flags = ap->a_oflags;
 102         int fmt = 0;
 103         struct thread *p = curthread;
 104         struct drm_device *dev;
 105         int retcode;
 106
 107         dev = DRIVER_SOFTC(minor(kdev));
 108         if (dev == NULL)
 109                 return (ENXIO);
 110
 111         DRM_DEBUG("open_count = %d\n", dev->open_count);
 112
 113         retcode = drm_open_helper(kdev, flags, fmt, p, dev, ap->a_fp);
 114
 115         if (retcode == 0) {
 116                 atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
 117                 DRM_LOCK(dev);
 118                 device_busy(dev->dev);
 119                 if (!dev->open_count++)
 120                         retcode = drm_setup(dev);
 121                 DRM_UNLOCK(dev);
 122         }
 123
 124         DRM_DEBUG("return %d\n", retcode);
 125
 126         return (retcode);
 127 }
 128
 129 /* drm_open_helper is called whenever a process opens /dev/drm. */
 130 int drm_open_helper(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p,
 131                     struct drm_device *dev, struct file *fp)
 132 {
 133         struct drm_file *priv;
 134         int retcode;
 135
 136         if (flags & O_EXCL)
 137                 return EBUSY; /* No exclusive opens */
 138         dev->flags = flags;
 139
 140         DRM_DEBUG("pid = %d, device = %s\n", DRM_CURRENTPID, devtoname(kdev));
 141
 142         priv = kmalloc(sizeof(*priv), M_DRM, M_WAITOK | M_NULLOK | M_ZERO);
 143         if (priv == NULL) {
 144                 return ENOMEM;
 145         }
 146
 147         DRM_LOCK(dev);
 148         priv->dev               = dev;
 149         priv->uid               = p->td_proc->p_ucred->cr_svuid;
 150         priv->pid               = p->td_proc->p_pid;
 151
 152         /* for compatibility root is always authenticated */
 153         priv->authenticated = capable(CAP_SYS_ADMIN);
 154
 155         INIT_LIST_HEAD(&priv->fbs);
 156         INIT_LIST_HEAD(&priv->event_list);
 157         init_waitqueue_head(&priv->event_wait);
 158         priv->event_space = 4096; /* set aside 4k for event buffer */
 159
 160         if (dev->driver->driver_features & DRIVER_GEM)
 161                 drm_gem_open(dev, priv);
 162
 163         if (dev->driver->open) {
 164                 /* shared code returns -errno */
 165                 retcode = -dev->driver->open(dev, priv);
 166                 if (retcode != 0) {
 167                         drm_free(priv, M_DRM);
 168                         DRM_UNLOCK(dev);
 169                         return retcode;
 170                 }
 171         }
 172
 173         /* first opener automatically becomes master */
 174         priv->master = list_empty(&dev->filelist);
 175
 176         list_add(&priv->lhead, &dev->filelist);
 177         DRM_UNLOCK(dev);
 178         kdev->si_drv1 = dev;
 179
 180         retcode = devfs_set_cdevpriv(fp, priv, &drm_cdevpriv_dtor);
 181         if (retcode != 0)
 182                 drm_cdevpriv_dtor(priv);
 183
 184         return retcode;
 185 }
 186
 187 /**
 188  * Release file.
 189  *
 190  * \param inode device inode
 191  * \param file_priv DRM file private.
 192  * \return zero on success or a negative number on failure.
 193  *
 194  * If the hardware lock is held then free it, and take it again for the kernel
 195  * context since it's necessary to reclaim buffers. Unlink the file private
 196  * data from its list and free it. Decreases the open count and if it reaches
 197  * zero calls drm_lastclose().
 198  */
 199
 200 static void drm_unload(struct drm_device *dev)
 201 {
 202         int i;
 203
 204         DRM_DEBUG("\n");
 205
 206         drm_sysctl_cleanup(dev);
 207         if (dev->devnode != NULL)
 208                 destroy_dev(dev->devnode);
 209
 210         if (dev->driver->driver_features & DRIVER_GEM)
 211                 drm_gem_destroy(dev);
 212
 213         if (dev->agp && dev->agp->agp_mtrr) {
 214                 int __unused retcode;
 215
 216                 retcode = drm_mtrr_del(0, dev->agp->agp_info.ai_aperture_base,
 217                     dev->agp->agp_info.ai_aperture_size, DRM_MTRR_WC);
 218                 DRM_DEBUG("mtrr_del = %d", retcode);
 219         }
 220
 221         drm_vblank_cleanup(dev);
 222
 223         DRM_LOCK(dev);
 224         drm_lastclose(dev);
 225         DRM_UNLOCK(dev);
 226
 227         /* Clean up PCI resources allocated by drm_bufs.c.  We're not really
 228          * worried about resource consumption while the DRM is inactive (between
 229          * lastclose and firstopen or unload) because these aren't actually
 230          * taking up KVA, just keeping the PCI resource allocated.
 231          */
 232         for (i = 0; i < DRM_MAX_PCI_RESOURCE; i++) {
 233                 if (dev->pcir[i] == NULL)
 234                         continue;
 235                 bus_release_resource(dev->dev, SYS_RES_MEMORY,
 236                     dev->pcirid[i], dev->pcir[i]);
 237                 dev->pcir[i] = NULL;
 238         }
 239
 240         if (dev->agp) {
 241                 drm_free(dev->agp, M_DRM);
 242                 dev->agp = NULL;
 243         }
 244
 245         if (dev->driver->unload != NULL) {
 246                 DRM_LOCK(dev);
 247                 dev->driver->unload(dev);
 248                 DRM_UNLOCK(dev);
 249         }
 250
 251         drm_mem_uninit();
 252
 253         if (pci_disable_busmaster(dev->dev))
 254                 DRM_ERROR("Request to disable bus-master failed.\n");
 255
 256         lockuninit(&dev->vbl_lock);
 257         lockuninit(&dev->dev_lock);
 258         lockuninit(&dev->event_lock);
 259         lockuninit(&dev->struct_mutex);
 260 }
 261
 262 int drm_release(device_t kdev)
 263 {
 264         struct drm_device *dev;
 265
 266         dev = device_get_softc(kdev);
 267         drm_unload(dev);
 268         if (dev->irqr) {
 269                 bus_release_resource(dev->dev, SYS_RES_IRQ, dev->irqrid,
 270                     dev->irqr);
 271                 if (dev->irq_type == PCI_INTR_TYPE_MSI) {
 272                         pci_release_msi(dev->dev);
 273                         DRM_INFO("MSI released\n");
 274                 }
 275         }
 276         return (0);
 277 }
 278
 279 static bool
 280 drm_dequeue_event(struct drm_device *dev, struct drm_file *file_priv,
 281     struct uio *uio, struct drm_pending_event **out)
 282 {
 283         struct drm_pending_event *e;
 284
 285         if (list_empty(&file_priv->event_list))
 286                 return (false);
 287         e = list_first_entry(&file_priv->event_list,
 288             struct drm_pending_event, link);
 289         if (e->event->length > uio->uio_resid)
 290                 return (false);
 291
 292         file_priv->event_space += e->event->length;
 293         list_del(&e->link);
 294         *out = e;
 295         return (true);
 296 }
 297
 298 int
 299 drm_read(struct dev_read_args *ap)
 300 {
 301         struct cdev *kdev = ap->a_head.a_dev;
 302         struct uio *uio = ap->a_uio;
 303         struct drm_file *file_priv;
 304         struct drm_device *dev = drm_get_device_from_kdev(kdev);
 305         struct drm_pending_event *e;
 306         int error;
 307         int ret;
 308
 309         error = devfs_get_cdevpriv(ap->a_fp, (void **)&file_priv);
 310         if (error != 0) {
 311                 DRM_ERROR("can't find authenticator\n");
 312                 return (EINVAL);
 313         }
 314
 315         lockmgr(&dev->event_lock, LK_EXCLUSIVE);
 316         ret = wait_event_interruptible(file_priv->event_wait,
 317                                        !list_empty(&file_priv->event_list));
 318         if (ret < 0)
 319                 return ret;
 320
 321         while (drm_dequeue_event(dev, file_priv, uio, &e)) {
 322                 lockmgr(&dev->event_lock, LK_RELEASE);
 323                 error = uiomove((caddr_t)e->event, e->event->length, uio);
 324                 e->destroy(e);
 325                 if (error != 0)
 326                         return (error);
 327                 lockmgr(&dev->event_lock, LK_EXCLUSIVE);
 328         }
 329
 330         lockmgr(&dev->event_lock, LK_RELEASE);
 331         return (error);
 332 }
 333
 334 static int
 335 drmfilt(struct knote *kn, long hint)
 336 {
 337         struct drm_file *file_priv;
 338         struct drm_device *dev;
 339         int ready = 0;
 340
 341         file_priv = (struct drm_file *)kn->kn_hook;
 342         dev = file_priv->dev;
 343         lockmgr(&dev->event_lock, LK_EXCLUSIVE);
 344         if (!list_empty(&file_priv->event_list))
 345                 ready = 1;
 346         lockmgr(&dev->event_lock, LK_RELEASE);
 347
 348         return (ready);
 349 }
 350
 351 static void
 352 drmfilt_detach(struct knote *kn)
 353 {
 354         struct drm_file *file_priv;
 355         struct drm_device *dev;
 356         struct klist *klist;
 357
 358         file_priv = (struct drm_file *)kn->kn_hook;
 359         dev = file_priv->dev;
 360
 361         lockmgr(&dev->event_lock, LK_EXCLUSIVE);
 362         klist = &file_priv->dkq.ki_note;
 363         knote_remove(klist, kn);
 364         lockmgr(&dev->event_lock, LK_RELEASE);
 365 }
 366
 367 static struct filterops drmfiltops =
 368         { FILTEROP_ISFD, NULL, drmfilt_detach, drmfilt };
 369
 370 int
 371 drm_kqfilter(struct dev_kqfilter_args *ap)
 372 {
 373         struct cdev *kdev = ap->a_head.a_dev;
 374         struct drm_file *file_priv;
 375         struct drm_device *dev;
 376         struct knote *kn = ap->a_kn;
 377         struct klist *klist;
 378         int error;
 379
 380         error = devfs_get_cdevpriv(ap->a_fp, (void **)&file_priv);
 381         if (error != 0) {
 382                 DRM_ERROR("can't find authenticator\n");
 383                 return (EINVAL);
 384         }
 385         dev = drm_get_device_from_kdev(kdev);
 386
 387         ap->a_result = 0;
 388
 389         switch (kn->kn_filter) {
 390         case EVFILT_READ:
 391         case EVFILT_WRITE:
 392                 kn->kn_fop = &drmfiltops;
 393                 kn->kn_hook = (caddr_t)file_priv;
 394                 break;
 395         default:
 396                 ap->a_result = EOPNOTSUPP;
 397                 return (0);
 398         }
 399
 400         lockmgr(&dev->event_lock, LK_EXCLUSIVE);
 401         klist = &file_priv->dkq.ki_note;
 402         knote_insert(klist, kn);
 403         lockmgr(&dev->event_lock, LK_RELEASE);
 404
 405         return (0);
 406 }