/*- * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: * Rickard E. (Rik) Faith * Gareth Hughes * */ /** @file drm_drv.c * The catch-all file for DRM device support, including module setup/teardown, * open/close, and ioctl dispatch. */ #include #include "drmP.h" #include "drm.h" #include "drm_sarea.h" #include /* for TIOCSGRP */ #ifdef DRM_DEBUG_DEFAULT_ON int drm_debug_flag = 1; #else int drm_debug_flag = 0; #endif int drm_load(struct drm_device *); void drm_unload(struct drm_device *); drm_pci_id_list_t *drm_find_description(int , int , drm_pci_id_list_t *); int drm_firstopen(struct drm_device *); int drm_lastclose(struct drm_device *); static drm_ioctl_desc_t drm_ioctls[256] = { DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0), DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0), DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0), DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0), DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER), DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_dma, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0), DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_draw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), }; struct drm_device *drm_units[DRM_MAXUNITS]; static int init_units = 1; int drm_probe(struct pci_attach_args *pa, drm_pci_id_list_t *idlist) { int unit; drm_pci_id_list_t *id_entry; /* first make sure there is place for the device */ for(unit=0; unitpa_id), PCI_PRODUCT(pa->pa_id), idlist); if (id_entry != NULL) { return 1; } return 0; } void drm_attach(struct device *parent, struct device *kdev, struct pci_attach_args *pa, drm_pci_id_list_t *idlist) { int unit; struct drm_device *dev; drm_pci_id_list_t *id_entry; if(init_units) { for(unit=0; unitunit = unit; /* needed for pci_mapreg_* */ memcpy(&dev->pa, pa, sizeof(dev->pa)); dev->vga_softc = (struct vga_pci_softc *)parent; dev->irq = pa->pa_intrline; dev->pci_bus = pa->pa_bus; dev->pci_slot = pa->pa_device; dev->pci_func = pa->pa_function; DRM_SPININIT(&dev->dev_lock, "drm device"); DRM_SPININIT(&dev->drw_lock, "drm drawable lock"); id_entry = drm_find_description(PCI_VENDOR(pa->pa_id), PCI_PRODUCT(pa->pa_id), idlist); dev->id_entry = id_entry; dev->driver.id_entry = id_entry; printf("\n"); DRM_INFO("%s (unit %d)\n", id_entry->name, dev->unit); drm_load(dev); } int drm_detach(struct device *self, int flags) { drm_unload((struct drm_device *)self); return 0; } int drm_activate(struct device *self, enum devact act) { switch (act) { case DVACT_ACTIVATE: return (EOPNOTSUPP); break; case DVACT_DEACTIVATE: /* FIXME */ break; } return (0); } drm_pci_id_list_t * drm_find_description(int vendor, int device, drm_pci_id_list_t *idlist) { int i = 0; for (i = 0; idlist[i].vendor != 0; i++) { if ((idlist[i].vendor == vendor) && (idlist[i].device == device)) { return &idlist[i]; } } return NULL; } int drm_firstopen(struct drm_device *dev) { drm_local_map_t *map; int i; DRM_SPINLOCK_ASSERT(&dev->dev_lock); /* prebuild the SAREA */ i = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM, _DRM_CONTAINS_LOCK, &map); if (i != 0) return i; if (dev->driver.firstopen) dev->driver.firstopen(dev); dev->buf_use = 0; if (dev->driver.use_dma) { i = drm_dma_setup(dev); if (i != 0) return i; } dev->counters = 6; dev->types[0] = _DRM_STAT_LOCK; dev->types[1] = _DRM_STAT_OPENS; dev->types[2] = _DRM_STAT_CLOSES; dev->types[3] = _DRM_STAT_IOCTLS; dev->types[4] = _DRM_STAT_LOCKS; dev->types[5] = _DRM_STAT_UNLOCKS; for ( i = 0 ; i < DRM_ARRAY_SIZE(dev->counts) ; i++ ) atomic_set( &dev->counts[i], 0 ); SPLAY_INIT(&dev->magiclist); dev->lock.lock_queue = 0; dev->irq_enabled = 0; dev->context_flag = 0; dev->last_context = 0; dev->if_version = 0; dev->buf_pgid = 0; DRM_DEBUG( "\n" ); return 0; } int drm_lastclose(struct drm_device *dev) { struct drm_magic_entry *pt; drm_local_map_t *map, *mapsave; DRM_SPINLOCK_ASSERT(&dev->dev_lock); DRM_DEBUG( "\n" ); if (dev->driver.lastclose != NULL) dev->driver.lastclose(dev); if (dev->irq_enabled) drm_irq_uninstall(dev); if ( dev->unique ) { free(dev->unique, M_DRM); dev->unique = NULL; dev->unique_len = 0; } drm_drawable_free_all(dev); /* Clear pid list */ while ((pt = SPLAY_ROOT(&dev->magiclist)) != NULL) { SPLAY_REMOVE(drm_magic_tree, &dev->magiclist, pt); free(pt, M_DRM); } /* Clear AGP information */ if ( dev->agp ) { struct drm_agp_mem *entry; /* Remove AGP resources, but leave dev->agp intact until * drm_unload is called. */ while ((entry = TAILQ_FIRST(&dev->agp->memory)) != NULL) { if ( entry->bound ) drm_agp_unbind_memory(entry->handle); drm_agp_free_memory(entry->handle); TAILQ_REMOVE(&dev->agp->memory, entry, link); free(entry, M_DRM); } if (dev->agp->acquired) drm_agp_release(dev); dev->agp->acquired = 0; dev->agp->enabled = 0; } if (dev->sg != NULL) { drm_sg_cleanup(dev->sg); dev->sg = NULL; } for (map = TAILQ_FIRST(&dev->maplist); map != TAILQ_END(&dev->maplist); map = mapsave) { mapsave = TAILQ_NEXT(map, link); if (!(map->flags & _DRM_DRIVER)) drm_rmmap(dev, map); } drm_dma_takedown(dev); if ( dev->lock.hw_lock ) { dev->lock.hw_lock = NULL; /* SHM removed */ dev->lock.file_priv = NULL; DRM_WAKEUP_INT((void *)&dev->lock.lock_queue); } return 0; } int drm_load(struct drm_device *dev) { int retcode; DRM_DEBUG( "\n" ); dev->irq = dev->pa.pa_intrline; dev->pci_domain = 0; dev->pci_bus = dev->pa.pa_bus; dev->pci_slot = dev->pa.pa_device; dev->pci_func = dev->pa.pa_function; dev->pci_vendor = PCI_VENDOR(dev->pa.pa_id); dev->pci_device = PCI_PRODUCT(dev->pa.pa_id); TAILQ_INIT(&dev->maplist); drm_mem_init(); TAILQ_INIT(&dev->files); /* * the dma buffers api is just weird. offset 1Gb to ensure we don't * conflict with it. */ retcode = drm_memrange_init(&dev->handle_mm, 1024*1024*1024, LONG_MAX); if (retcode != 0) { DRM_ERROR("Failed to initialise handle memrange\n"); goto error; } if (dev->driver.load != NULL) { DRM_LOCK(); /* Shared code returns -errno. */ retcode = -dev->driver.load(dev, dev->id_entry->driver_private); DRM_UNLOCK(); if (retcode != 0) goto error; } if (dev->driver.use_agp) { if (drm_device_is_agp(dev)) dev->agp = drm_agp_init(); if (dev->driver.require_agp && dev->agp == NULL) { DRM_ERROR("Card isn't AGP, or couldn't initialize " "AGP.\n"); retcode = ENOMEM; goto error; } #ifndef DRM_NO_MTRR if (dev->agp != NULL) { if (drm_mtrr_add(dev->agp->info.ai_aperture_base, dev->agp->info.ai_aperture_size, DRM_MTRR_WC) == 0) dev->agp->mtrr = 1; } #endif } retcode = drm_ctxbitmap_init(dev); if (retcode != 0) { DRM_ERROR("Cannot allocate memory for context bitmap.\n"); goto error; } DRM_INFO("Initialized %s %d.%d.%d %s\n", dev->driver.name, dev->driver.major, dev->driver.minor, dev->driver.patchlevel, dev->driver.date); return 0; error: DRM_LOCK(); drm_lastclose(dev); DRM_UNLOCK(); DRM_SPINUNINIT(&dev->dev_lock); return retcode; } void drm_unload(struct drm_device *dev) { DRM_DEBUG( "\n" ); drm_ctxbitmap_cleanup(dev); drm_memrange_takedown(&dev->handle_mm); #if !defined(DRM_NO_MTRR) && !defined(DRM_NO_AGP) if (dev->agp && dev->agp->mtrr) { int retcode; retcode = drm_mtrr_del(0, dev->agp->info.ai_aperture_base, dev->agp->info.ai_aperture_size, DRM_MTRR_WC); DRM_DEBUG("mtrr_del = %d", retcode); } #endif DRM_LOCK(); drm_lastclose(dev); DRM_UNLOCK(); if ( dev->agp ) { free(dev->agp, M_DRM); dev->agp = NULL; } if (dev->driver.unload != NULL) dev->driver.unload(dev); drm_mem_uninit(); DRM_SPINUNINIT(&dev->dev_lock); } int drm_version(struct drm_device *dev, void *data, struct drm_file *file_priv) { drm_version_t *version = data; int len; #define DRM_COPY( name, value ) \ len = strlen( value ); \ if ( len > name##_len ) len = name##_len; \ name##_len = strlen( value ); \ if ( len && name ) { \ if ( DRM_COPY_TO_USER( name, value, len ) ) \ return EFAULT; \ } version->version_major = dev->driver.major; version->version_minor = dev->driver.minor; version->version_patchlevel = dev->driver.patchlevel; DRM_COPY(version->name, dev->driver.name); DRM_COPY(version->date, dev->driver.date); DRM_COPY(version->desc, dev->driver.desc); return 0; } int drmopen(DRM_CDEV kdev, int flags, int fmt, DRM_STRUCTPROC *p) { struct drm_device *dev = NULL; int retcode = 0; dev = drm_get_device_from_kdev(kdev); if (dev == NULL) return (ENXIO); dev->kdev = kdev; /* hack for now */ DRM_DEBUG( "open_count = %d\n", dev->open_count ); retcode = drm_open_helper(kdev, flags, fmt, p, dev); if ( !retcode ) { atomic_inc( &dev->counts[_DRM_STAT_OPENS] ); DRM_LOCK(); if ( !dev->open_count++ ) retcode = drm_firstopen(dev); DRM_UNLOCK(); } return retcode; } int drmclose(DRM_CDEV kdev, int flags, int fmt, DRM_STRUCTPROC *p) { struct drm_device *dev = drm_get_device_from_kdev(kdev); struct drm_file *file_priv; int retcode = 0; DRM_DEBUG( "open_count = %d\n", dev->open_count ); DRM_LOCK(); file_priv = drm_find_file_by_minor(dev, minor(kdev)); if (!file_priv) { DRM_UNLOCK(); DRM_ERROR("can't find authenticator\n"); retcode = EINVAL; goto done; } if (--file_priv->refs != 0) goto done; if (dev->driver.preclose != NULL) dev->driver.preclose(dev, file_priv); /* ======================================================== * Begin inline drm_release */ DRM_DEBUG( "pid = %d, device = 0x%lx, open_count = %d\n", DRM_CURRENTPID, (long)&dev->device, dev->open_count); if (dev->lock.hw_lock && _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) && dev->lock.file_priv == file_priv) { DRM_DEBUG("Process %d dead, freeing lock for context %d\n", DRM_CURRENTPID, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); if (dev->driver.reclaim_buffers_locked != NULL) dev->driver.reclaim_buffers_locked(dev, file_priv); drm_lock_free(dev, &dev->lock.hw_lock->lock, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); /* FIXME: may require heavy-handed reset of hardware at this point, possibly processed via a callback to the X server. */ } else if (dev->driver.reclaim_buffers_locked != NULL && dev->lock.hw_lock != NULL) { /* The lock is required to reclaim buffers */ for (;;) { if ( !dev->lock.hw_lock ) { /* Device has been unregistered */ retcode = EINTR; break; } if (drm_lock_take(&dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT)) { dev->lock.file_priv = file_priv; dev->lock.lock_time = jiffies; atomic_inc( &dev->counts[_DRM_STAT_LOCKS] ); break; /* Got lock */ } /* Contention */ retcode = DRM_SLEEPLOCK((void *)&dev->lock.lock_queue, &dev->dev_lock, PZERO | PCATCH, "drmlk2", 0); if (retcode) break; } if (retcode == 0) { dev->driver.reclaim_buffers_locked(dev, file_priv); drm_lock_free(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT); } } if (dev->driver.use_dma && !dev->driver.reclaim_buffers_locked) drm_reclaim_buffers(dev, file_priv); dev->buf_pgid = 0; if (dev->driver.postclose != NULL) dev->driver.postclose(dev, file_priv); TAILQ_REMOVE(&dev->files, file_priv, link); free(file_priv, M_DRM); /* ======================================================== * End inline drm_release */ done: atomic_inc( &dev->counts[_DRM_STAT_CLOSES] ); if (--dev->open_count == 0) { retcode = drm_lastclose(dev); } DRM_UNLOCK(); return retcode; } /* drmioctl is called whenever a process performs an ioctl on /dev/drm. */ int drmioctl(DRM_CDEV kdev, u_long cmd, caddr_t data, int flags, DRM_STRUCTPROC *p) { struct drm_device *dev = drm_get_device_from_kdev(kdev); int retcode = 0; drm_ioctl_desc_t *ioctl; int (*func)(struct drm_device *, void *, struct drm_file *); int nr = DRM_IOCTL_NR(cmd); int is_driver_ioctl = 0; struct drm_file *file_priv; if (dev == NULL) return ENODEV; DRM_LOCK(); file_priv = drm_find_file_by_minor(dev, minor(kdev)); DRM_UNLOCK(); if (file_priv == NULL) { DRM_ERROR("can't find authenticator\n"); return EINVAL; } atomic_inc( &dev->counts[_DRM_STAT_IOCTLS] ); ++file_priv->ioctl_count; DRM_DEBUG( "pid=%d, cmd=0x%02lx, nr=0x%02x, dev 0x%lx, auth=%d\n", DRM_CURRENTPID, cmd, nr, (long)&dev->device, file_priv->authenticated ); switch (cmd) { case FIONBIO: case FIOASYNC: return 0; case TIOCSPGRP: dev->buf_pgid = *(int *)data; return 0; case TIOCGPGRP: *(int *)data = dev->buf_pgid; return 0; } if (IOCGROUP(cmd) != DRM_IOCTL_BASE) { DRM_DEBUG("Bad ioctl group 0x%x\n", (int)IOCGROUP(cmd)); return EINVAL; } ioctl = &drm_ioctls[nr]; /* It's not a core DRM ioctl, try driver-specific. */ if (ioctl->func == NULL && nr >= DRM_COMMAND_BASE) { /* The array entries begin at DRM_COMMAND_BASE ioctl nr */ nr -= DRM_COMMAND_BASE; if (nr > dev->driver.max_ioctl) { DRM_DEBUG("Bad driver ioctl number, 0x%x (of 0x%x)\n", nr, dev->driver.max_ioctl); return EINVAL; } ioctl = &dev->driver.ioctls[nr]; is_driver_ioctl = 1; } func = ioctl->func; if (func == NULL) { DRM_DEBUG( "no function\n" ); return EINVAL; } /* * master must be root, and all ioctls that are ROOT_ONLY are * also DRM_MASTER. */ if (((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) || ((ioctl->flags & DRM_MASTER) && !file_priv->master)) return EACCES; if (is_driver_ioctl) { DRM_LOCK(); /* shared code returns -errno */ retcode = -func(dev, data, file_priv); DRM_UNLOCK(); } else { retcode = func(dev, data, file_priv); } if (retcode != 0) DRM_DEBUG(" returning %d\n", retcode); return retcode; } drm_local_map_t * drm_getsarea(struct drm_device *dev) { drm_local_map_t *map; DRM_SPINLOCK_ASSERT(&dev->dev_lock); TAILQ_FOREACH(map, &dev->maplist, link) { if (map->type == _DRM_SHM && (map->flags & _DRM_CONTAINS_LOCK)) return map; } return NULL; }