/** * \file drm_drv.c * Generic driver template * * \author Rickard E. (Rik) Faith * \author Gareth Hughes * * To use this template, you must at least define the following (samples * given for the MGA driver): * * \code * #define DRIVER_AUTHOR "VA Linux Systems, Inc." * * #define DRIVER_NAME "mga" * #define DRIVER_DESC "Matrox G200/G400" * #define DRIVER_DATE "20001127" * * #define drm_x mga_##x * \endcode */ /* * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com * * 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. */ #include #include #include "drmP.h" #include "drm_core.h" static int drm_version(struct drm_device *dev, void *data, struct drm_file *file_priv); /** Ioctl table */ static struct drm_ioctl_desc drm_ioctls[] = { 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_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_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_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|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, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 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), /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */ DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH), DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), #if __OS_HAS_AGP 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), #endif 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_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_MASTER|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED) }; #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) /** * Take down the DRM device. * * \param dev DRM device structure. * * Frees every resource in \p dev. * * \sa drm_device */ int drm_lastclose(struct drm_device * dev) { struct drm_vma_entry *vma, *vma_temp; int i; DRM_DEBUG("\n"); if (dev->driver->lastclose) dev->driver->lastclose(dev); DRM_DEBUG("driver lastclose completed\n"); if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET)) drm_irq_uninstall(dev); mutex_lock(&dev->struct_mutex); /* Free drawable information memory */ drm_drawable_free_all(dev); del_timer(&dev->timer); /* Clear AGP information */ if (drm_core_has_AGP(dev) && dev->agp && !drm_core_check_feature(dev, DRIVER_MODESET)) { struct drm_agp_mem *entry, *tempe; /* Remove AGP resources, but leave dev->agp intact until drv_cleanup is called. */ list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) { if (entry->bound) drm_unbind_agp(entry->memory); drm_free_agp(entry->memory, entry->pages); kfree(entry); } INIT_LIST_HEAD(&dev->agp->memory); if (dev->agp->acquired) drm_agp_release(dev); dev->agp->acquired = 0; dev->agp->enabled = 0; } if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg && !drm_core_check_feature(dev, DRIVER_MODESET)) { drm_sg_cleanup(dev->sg); dev->sg = NULL; } /* Clear vma list (only built for debugging) */ list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { list_del(&vma->head); kfree(vma); } if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) { for (i = 0; i < dev->queue_count; i++) { kfree(dev->queuelist[i]); dev->queuelist[i] = NULL; } kfree(dev->queuelist); dev->queuelist = NULL; } dev->queue_count = 0; if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && !drm_core_check_feature(dev, DRIVER_MODESET)) drm_dma_takedown(dev); dev->dev_mapping = NULL; mutex_unlock(&dev->struct_mutex); DRM_DEBUG("lastclose completed\n"); return 0; } /** * Module initialization. Called via init_module at module load time, or via * linux/init/main.c (this is not currently supported). * * \return zero on success or a negative number on failure. * * Initializes an array of drm_device structures, and attempts to * initialize all available devices, using consecutive minors, registering the * stubs and initializing the AGP device. * * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and * after the initialization for driver customization. */ int drm_init(struct drm_driver *driver) { struct pci_dev *pdev = NULL; const struct pci_device_id *pid; int i; DRM_DEBUG("\n"); INIT_LIST_HEAD(&driver->device_list); if (driver->driver_features & DRIVER_MODESET) return pci_register_driver(&driver->pci_driver); /* If not using KMS, fall back to stealth mode manual scanning. */ for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) { pid = &driver->pci_driver.id_table[i]; /* Loop around setting up a DRM device for each PCI device * matching our ID and device class. If we had the internal * function that pci_get_subsys and pci_get_class used, we'd * be able to just pass pid in instead of doing a two-stage * thing. */ pdev = NULL; while ((pdev = pci_get_subsys(pid->vendor, pid->device, pid->subvendor, pid->subdevice, pdev)) != NULL) { if ((pdev->class & pid->class_mask) != pid->class) continue; /* stealth mode requires a manual probe */ pci_dev_get(pdev); drm_get_dev(pdev, pid, driver); } } return 0; } EXPORT_SYMBOL(drm_init); void drm_exit(struct drm_driver *driver) { struct drm_device *dev, *tmp; DRM_DEBUG("\n"); if (driver->driver_features & DRIVER_MODESET) { pci_unregister_driver(&driver->pci_driver); } else { list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item) drm_put_dev(dev); } DRM_INFO("Module unloaded\n"); } EXPORT_SYMBOL(drm_exit); /** File operations structure */ static const struct file_operations drm_stub_fops = { .owner = THIS_MODULE, .open = drm_stub_open }; static int __init drm_core_init(void) { int ret = -ENOMEM; idr_init(&drm_minors_idr); if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) goto err_p1; drm_class = drm_sysfs_create(THIS_MODULE, "drm"); if (IS_ERR(drm_class)) { printk(KERN_ERR "DRM: Error creating drm class.\n"); ret = PTR_ERR(drm_class); goto err_p2; } drm_proc_root = proc_mkdir("dri", NULL); if (!drm_proc_root) { DRM_ERROR("Cannot create /proc/dri\n"); ret = -1; goto err_p3; } drm_debugfs_root = debugfs_create_dir("dri", NULL); if (!drm_debugfs_root) { DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); ret = -1; goto err_p3; } DRM_INFO("Initialized %s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); return 0; err_p3: drm_sysfs_destroy(); err_p2: unregister_chrdev(DRM_MAJOR, "drm"); idr_destroy(&drm_minors_idr); err_p1: return ret; } static void __exit drm_core_exit(void) { remove_proc_entry("dri", NULL); debugfs_remove(drm_debugfs_root); drm_sysfs_destroy(); unregister_chrdev(DRM_MAJOR, "drm"); idr_destroy(&drm_minors_idr); } module_init(drm_core_init); module_exit(drm_core_exit); /** * Copy and IOCTL return string to user space */ static int drm_copy_field(char *buf, size_t *buf_len, const char *value) { int len; /* don't overflow userbuf */ len = strlen(value); if (len > *buf_len) len = *buf_len; /* let userspace know exact length of driver value (which could be * larger than the userspace-supplied buffer) */ *buf_len = strlen(value); /* finally, try filling in the userbuf */ if (len && buf) if (copy_to_user(buf, value, len)) return -EFAULT; return 0; } /** * Get version information * * \param inode device inode. * \param filp file pointer. * \param cmd command. * \param arg user argument, pointing to a drm_version structure. * \return zero on success or negative number on failure. * * Fills in the version information in \p arg. */ static int drm_version(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_version *version = data; int err; version->version_major = dev->driver->major; version->version_minor = dev->driver->minor; version->version_patchlevel = dev->driver->patchlevel; err = drm_copy_field(version->name, &version->name_len, dev->driver->name); if (!err) err = drm_copy_field(version->date, &version->date_len, dev->driver->date); if (!err) err = drm_copy_field(version->desc, &version->desc_len, dev->driver->desc); return err; } /** * Called whenever a process performs an ioctl on /dev/drm. * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg user argument. * \return zero on success or negative number on failure. * * Looks up the ioctl function in the ::ioctls table, checking for root * previleges if so required, and dispatches to the respective function. */ long drm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct drm_file *file_priv = filp->private_data; struct drm_device *dev; struct drm_ioctl_desc *ioctl; drm_ioctl_t *func; unsigned int nr = DRM_IOCTL_NR(cmd); int retcode = -EINVAL; char stack_kdata[128]; char *kdata = NULL; dev = file_priv->minor->dev; atomic_inc(&dev->ioctl_count); atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]); ++file_priv->ioctl_count; DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n", task_pid_nr(current), cmd, nr, (long)old_encode_dev(file_priv->minor->device), file_priv->authenticated); if ((nr >= DRM_CORE_IOCTL_COUNT) && ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) goto err_i1; if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { ioctl = &drm_ioctls[nr]; cmd = ioctl->cmd; } else goto err_i1; /* Do not trust userspace, use our own definition */ func = ioctl->func; /* is there a local override? */ if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl) func = dev->driver->dma_ioctl; if (!func) { DRM_DEBUG("no function\n"); retcode = -EINVAL; } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) || ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) || ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) || (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) { retcode = -EACCES; } else { if (cmd & (IOC_IN | IOC_OUT)) { if (_IOC_SIZE(cmd) <= sizeof(stack_kdata)) { kdata = stack_kdata; } else { kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); if (!kdata) { retcode = -ENOMEM; goto err_i1; } } } if (cmd & IOC_IN) { if (copy_from_user(kdata, (void __user *)arg, _IOC_SIZE(cmd)) != 0) { retcode = -EFAULT; goto err_i1; } } else memset(kdata, 0, _IOC_SIZE(cmd)); if (ioctl->flags & DRM_UNLOCKED) retcode = func(dev, kdata, file_priv); else { lock_kernel(); retcode = func(dev, kdata, file_priv); unlock_kernel(); } if (cmd & IOC_OUT) { if (copy_to_user((void __user *)arg, kdata, _IOC_SIZE(cmd)) != 0) retcode = -EFAULT; } } err_i1: if (kdata != stack_kdata) kfree(kdata); atomic_dec(&dev->ioctl_count); if (retcode) DRM_DEBUG("ret = %x\n", retcode); return retcode; } EXPORT_SYMBOL(drm_ioctl); struct drm_local_map *drm_getsarea(struct drm_device *dev) { struct drm_map_list *entry; list_for_each_entry(entry, &dev->maplist, head) { if (entry->map && entry->map->type == _DRM_SHM && (entry->map->flags & _DRM_CONTAINS_LOCK)) { return entry->map; } } return NULL; } EXPORT_SYMBOL(drm_getsarea);