/** * \file drm_fops.c * File operations for DRM * * \author Rickard E. (Rik) Faith <faith@valinux.com> * \author Daryll Strauss <daryll@valinux.com> * \author Gareth Hughes <gareth@valinux.com> */ /* * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com * * Copyright 1999 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 <drm/drmP.h>#include <linux/poll.h>#include <linux/slab.h>#include <linux/module.h> /* from BKL pushdown: note that nothing else serializes idr_find() */DEFINE_MUTEX(drm_global_mutex);EXPORT_SYMBOL(drm_global_mutex); static int drm_open_helper(struct inode *inode, struct file *filp, struct drm_device * dev); static int drm_setup(struct drm_device * dev){ int ret; if (dev->driver->firstopen && !drm_core_check_feature(dev, DRIVER_MODESET)) { ret = dev->driver->firstopen(dev); if (ret != 0) return ret; } ret = drm_legacy_dma_setup(dev); if (ret < 0) return ret; DRM_DEBUG("\n"); return 0;} /** * Open file. * * \param inode device inode * \param filp file pointer. * \return zero on success or a negative number on failure. * * Searches the DRM device with the same minor number, calls open_helper(), and * increments the device open count. If the open count was previous at zero, * i.e., it's the first that the device is open, then calls setup(). */int drm_open(struct inode *inode, struct file *filp){ struct drm_device *dev = NULL; int minor_id = iminor(inode); struct drm_minor *minor; int retcode = 0; int need_setup = 0; struct address_space *old_mapping; struct address_space *old_imapping; minor = idr_find(&drm_minors_idr, minor_id); if (!minor) return -ENODEV; if (!(dev = minor->dev)) return -ENODEV; if (drm_device_is_unplugged(dev)) return -ENODEV; if (!dev->open_count++) need_setup = 1; mutex_lock(&dev->struct_mutex); old_imapping = inode->i_mapping; old_mapping = dev->dev_mapping; if (old_mapping == NULL) dev->dev_mapping = &inode->i_data; /* ihold ensures nobody can remove inode with our i_data */ ihold(container_of(dev->dev_mapping, struct inode, i_data)); inode->i_mapping = dev->dev_mapping; filp->f_mapping = dev->dev_mapping; mutex_unlock(&dev->struct_mutex); retcode = drm_open_helper(inode, filp, dev); if (retcode) goto err_undo; if (need_setup) { retcode = drm_setup(dev); if (retcode) goto err_undo; } return 0; err_undo: mutex_lock(&dev->struct_mutex); filp->f_mapping = old_imapping; inode->i_mapping = old_imapping; iput(container_of(dev->dev_mapping, struct inode, i_data)); dev->dev_mapping = old_mapping; mutex_unlock(&dev->struct_mutex); dev->open_count--; return retcode;}EXPORT_SYMBOL(drm_open); /** * File \c open operation. * * \param inode device inode. * \param filp file pointer. * * Puts the dev->fops corresponding to the device minor number into * \p filp, call the \c open method, and restore the file operations. */int drm_stub_open(struct inode *inode, struct file *filp){ struct drm_device *dev = NULL; struct drm_minor *minor; int minor_id = iminor(inode); int err = -ENODEV; const struct file_operations *new_fops; DRM_DEBUG("\n"); mutex_lock(&drm_global_mutex); minor = idr_find(&drm_minors_idr, minor_id); if (!minor) goto out; if (!(dev = minor->dev)) goto out; if (drm_device_is_unplugged(dev)) goto out; new_fops = fops_get(dev->driver->fops); if (!new_fops) goto out; replace_fops(filp, new_fops); if (filp->f_op->open) err = filp->f_op->open(inode, filp);out: mutex_unlock(&drm_global_mutex); return err;} /** * Check whether DRI will run on this CPU. * * \return non-zero if the DRI will run on this CPU, or zero otherwise. */static int drm_cpu_valid(void){#if defined(__i386__) if (boot_cpu_data.x86 == 3) return 0; /* No cmpxchg on a 386 */#endif#if defined(__sparc__) && !defined(__sparc_v9__) return 0; /* No cmpxchg before v9 sparc. */#endif return 1;} /** * Called whenever a process opens /dev/drm. * * \param inode device inode. * \param filp file pointer. * \param dev device. * \return zero on success or a negative number on failure. * * Creates and initializes a drm_file structure for the file private data in \p * filp and add it into the double linked list in \p dev. */static int drm_open_helper(struct inode *inode, struct file *filp, struct drm_device * dev){ int minor_id = iminor(inode); struct drm_file *priv; int ret; if (filp->f_flags & O_EXCL) return -EBUSY; /* No exclusive opens */ if (!drm_cpu_valid()) return -EINVAL; if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF) return -EINVAL; DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id); priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; filp->private_data = priv; priv->filp = filp; priv->uid = current_euid(); priv->pid = get_pid(task_pid(current)); priv->minor = idr_find(&drm_minors_idr, minor_id); if (!priv->minor) { ret = -ENODEV; goto out_put_pid; } priv->ioctl_count = 0; /* for compatibility root is always authenticated */ priv->always_authenticated = capable(CAP_SYS_ADMIN); priv->authenticated = priv->always_authenticated; priv->lock_count = 0; INIT_LIST_HEAD(&priv->lhead); INIT_LIST_HEAD(&priv->fbs); mutex_init(&priv->fbs_lock); INIT_LIST_HEAD(&priv->event_list); init_waitqueue_head(&priv->event_wait); priv->event_space = 4096; /* set aside 4k for event buffer */ if (dev->driver->driver_features & DRIVER_GEM) drm_gem_open(dev, priv); if (drm_core_check_feature(dev, DRIVER_PRIME)) drm_prime_init_file_private(&priv->prime); if (dev->driver->open) { ret = dev->driver->open(dev, priv); if (ret < 0) goto out_prime_destroy; } /* if there is no current master make this fd it, but do not create * any master object for render clients */ mutex_lock(&dev->struct_mutex); if (!priv->minor->master && !drm_is_render_client(priv)) { /* create a new master */ priv->minor->master = drm_master_create(priv->minor); if (!priv->minor->master) { mutex_unlock(&dev->struct_mutex); ret = -ENOMEM; goto out_close; } priv->is_master = 1; /* take another reference for the copy in the local file priv */ priv->master = drm_master_get(priv->minor->master); priv->authenticated = 1; mutex_unlock(&dev->struct_mutex); if (dev->driver->master_create) { ret = dev->driver->master_create(dev, priv->master); if (ret) { mutex_lock(&dev->struct_mutex); /* drop both references if this fails */ drm_master_put(&priv->minor->master); drm_master_put(&priv->master); mutex_unlock(&dev->struct_mutex); goto out_close; } } mutex_lock(&dev->struct_mutex); if (dev->driver->master_set) { ret = dev->driver->master_set(dev, priv, true); if (ret) { /* drop both references if this fails */ drm_master_put(&priv->minor->master); drm_master_put(&priv->master); mutex_unlock(&dev->struct_mutex); goto out_close; } } } else if (!drm_is_render_client(priv)) { /* get a reference to the master */ priv->master = drm_master_get(priv->minor->master); } mutex_unlock(&dev->struct_mutex); mutex_lock(&dev->struct_mutex); list_add(&priv->lhead, &dev->filelist); mutex_unlock(&dev->struct_mutex); #ifdef __alpha__ /* * Default the hose */ if (!dev->hose) { struct pci_dev *pci_dev; pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); if (pci_dev) { dev->hose = pci_dev->sysdata; pci_dev_put(pci_dev); } if (!dev->hose) { struct pci_bus *b = pci_bus_b(pci_root_buses.next); if (b) dev->hose = b->sysdata; } }#endif return 0; out_close: if (dev->driver->postclose) dev->driver->postclose(dev, priv);out_prime_destroy: if (drm_core_check_feature(dev, DRIVER_PRIME)) drm_prime_destroy_file_private(&priv->prime); if (dev->driver->driver_features & DRIVER_GEM) drm_gem_release(dev, priv);out_put_pid: put_pid(priv->pid); kfree(priv); filp->private_data = NULL; return ret;} static void drm_master_release(struct drm_device *dev, struct file *filp){ struct drm_file *file_priv = filp->private_data; if (drm_i_have_hw_lock(dev, file_priv)) { DRM_DEBUG("File %p released, freeing lock for context %d\n", filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); drm_lock_free(&file_priv->master->lock, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); }} static void drm_events_release(struct drm_file *file_priv){ struct drm_device *dev = file_priv->minor->dev; struct drm_pending_event *e, *et; struct drm_pending_vblank_event *v, *vt; unsigned long flags; spin_lock_irqsave(&dev->event_lock, flags); /* Remove pending flips */ list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link) if (v->base.file_priv == file_priv) { list_del(&v->base.link); drm_vblank_put(dev, v->pipe); v->base.destroy(&v->base); } /* Remove unconsumed events */ list_for_each_entry_safe(e, et, &file_priv->event_list, link) { list_del(&e->link); e->destroy(e); } spin_unlock_irqrestore(&dev->event_lock, flags);} /** * drm_legacy_dev_reinit * * Reinitializes a legacy/ums drm device in it's lastclose function. */static void drm_legacy_dev_reinit(struct drm_device *dev){ if (drm_core_check_feature(dev, DRIVER_MODESET)) return; atomic_set(&dev->ioctl_count, 0); atomic_set(&dev->vma_count, 0); dev->sigdata.lock = NULL; dev->context_flag = 0; dev->last_context = 0; dev->if_version = 0;} /** * 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; 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); drm_agp_clear(dev); drm_legacy_sg_cleanup(dev); /* Clear vma list (only built for debugging) */ list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { list_del(&vma->head); kfree(vma); } drm_legacy_dma_takedown(dev); dev->dev_mapping = NULL; mutex_unlock(&dev->struct_mutex); drm_legacy_dev_reinit(dev); DRM_DEBUG("lastclose completed\n"); return 0;} /** * Release file. * * \param inode device inode * \param file_priv DRM file private. * \return zero on success or a negative number on failure. * * If the hardware lock is held then free it, and take it again for the kernel * context since it's necessary to reclaim buffers. Unlink the file private * data from its list and free it. Decreases the open count and if it reaches * zero calls drm_lastclose(). */int drm_release(struct inode *inode, struct file *filp){ struct drm_file *file_priv = filp->private_data; struct drm_device *dev = file_priv->minor->dev; int retcode = 0; mutex_lock(&drm_global_mutex); DRM_DEBUG("open_count = %d\n", dev->open_count); if (dev->driver->preclose) dev->driver->preclose(dev, file_priv); /* ======================================================== * Begin inline drm_release */ DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", task_pid_nr(current), (long)old_encode_dev(file_priv->minor->device), dev->open_count); /* Release any auth tokens that might point to this file_priv, (do that under the drm_global_mutex) */ if (file_priv->magic) (void) drm_remove_magic(file_priv->master, file_priv->magic); /* if the master has gone away we can't do anything with the lock */ if (file_priv->minor->master) drm_master_release(dev, filp); if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) drm_core_reclaim_buffers(dev, file_priv); drm_events_release(file_priv); if (dev->driver->driver_features & DRIVER_MODESET) drm_fb_release(file_priv); Lines 1–500 of 666. 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/** * \file drm_fops.c * File operations for DRM * * \author Rickard E. (Rik) Faith <faith@valinux.com> * \author Daryll Strauss <daryll@valinux.com> * \author Gareth Hughes <gareth@valinux.com> */ /* * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com * * Copyright 1999 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 <drm/drmP.h> #include <linux/poll.h> #include <linux/slab.h> #include <linux/module.h> /* from BKL pushdown: note that nothing else serializes idr_find() */ DEFINE_MUTEX(drm_global_mutex); EXPORT_SYMBOL(drm_global_mutex); static int drm_open_helper(struct inode *inode, struct file *filp, struct drm_device * dev); static int drm_setup(struct drm_device * dev) { int ret; if (dev->driver->firstopen && !drm_core_check_feature(dev, DRIVER_MODESET)) { ret = dev->driver->firstopen(dev); if (ret != 0) return ret; } ret = drm_legacy_dma_setup(dev); if (ret < 0) return ret; DRM_DEBUG("\n"); return 0; } /** * Open file. * * \param inode device inode * \param filp file pointer. * \return zero on success or a negative number on failure. * * Searches the DRM device with the same minor number, calls open_helper(), and * increments the device open count. If the open count was previous at zero, * i.e., it's the first that the device is open, then calls setup(). */ int drm_open(struct inode *inode, struct file *filp) { struct drm_device *dev = NULL; int minor_id = iminor(inode); struct drm_minor *minor; int retcode = 0; int need_setup = 0; struct address_space *old_mapping; struct address_space *old_imapping; minor = idr_find(&drm_minors_idr, minor_id); if (!minor) return -ENODEV; if (!(dev = minor->dev)) return -ENODEV; if (drm_device_is_unplugged(dev)) return -ENODEV; if (!dev->open_count++) need_setup = 1; mutex_lock(&dev->struct_mutex); old_imapping = inode->i_mapping; old_mapping = dev->dev_mapping; if (old_mapping == NULL) dev->dev_mapping = &inode->i_data; /* ihold ensures nobody can remove inode with our i_data */ ihold(container_of(dev->dev_mapping, struct inode, i_data)); inode->i_mapping = dev->dev_mapping; filp->f_mapping = dev->dev_mapping; mutex_unlock(&dev->struct_mutex); retcode = drm_open_helper(inode, filp, dev); if (retcode) goto err_undo; if (need_setup) { retcode = drm_setup(dev); if (retcode) goto err_undo; } return 0; err_undo: mutex_lock(&dev->struct_mutex); filp->f_mapping = old_imapping; inode->i_mapping = old_imapping; iput(container_of(dev->dev_mapping, struct inode, i_data)); dev->dev_mapping = old_mapping; mutex_unlock(&dev->struct_mutex); dev->open_count--; return retcode; } EXPORT_SYMBOL(drm_open); /** * File \c open operation. * * \param inode device inode. * \param filp file pointer. * * Puts the dev->fops corresponding to the device minor number into * \p filp, call the \c open method, and restore the file operations. */ int drm_stub_open(struct inode *inode, struct file *filp) { struct drm_device *dev = NULL; struct drm_minor *minor; int minor_id = iminor(inode); int err = -ENODEV; const struct file_operations *new_fops; DRM_DEBUG("\n"); mutex_lock(&drm_global_mutex); minor = idr_find(&drm_minors_idr, minor_id); if (!minor) goto out; if (!(dev = minor->dev)) goto out; if (drm_device_is_unplugged(dev)) goto out; new_fops = fops_get(dev->driver->fops); if (!new_fops) goto out; replace_fops(filp, new_fops); if (filp->f_op->open) err = filp->f_op->open(inode, filp); out: mutex_unlock(&drm_global_mutex); return err; } /** * Check whether DRI will run on this CPU. * * \return non-zero if the DRI will run on this CPU, or zero otherwise. */ static int drm_cpu_valid(void) { #if defined(__i386__) if (boot_cpu_data.x86 == 3) return 0; /* No cmpxchg on a 386 */ #endif #if defined(__sparc__) && !defined(__sparc_v9__) return 0; /* No cmpxchg before v9 sparc. */ #endif return 1; } /** * Called whenever a process opens /dev/drm. * * \param inode device inode. * \param filp file pointer. * \param dev device. * \return zero on success or a negative number on failure. * * Creates and initializes a drm_file structure for the file private data in \p * filp and add it into the double linked list in \p dev. */ static int drm_open_helper(struct inode *inode, struct file *filp, struct drm_device * dev) { int minor_id = iminor(inode); struct drm_file *priv; int ret; if (filp->f_flags & O_EXCL) return -EBUSY; /* No exclusive opens */ if (!drm_cpu_valid()) return -EINVAL; if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF) return -EINVAL; DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id); priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; filp->private_data = priv; priv->filp = filp; priv->uid = current_euid(); priv->pid = get_pid(task_pid(current)); priv->minor = idr_find(&drm_minors_idr, minor_id); if (!priv->minor) { ret = -ENODEV; goto out_put_pid; } priv->ioctl_count = 0; /* for compatibility root is always authenticated */ priv->always_authenticated = capable(CAP_SYS_ADMIN); priv->authenticated = priv->always_authenticated; priv->lock_count = 0; INIT_LIST_HEAD(&priv->lhead); INIT_LIST_HEAD(&priv->fbs); mutex_init(&priv->fbs_lock); INIT_LIST_HEAD(&priv->event_list); init_waitqueue_head(&priv->event_wait); priv->event_space = 4096; /* set aside 4k for event buffer */ if (dev->driver->driver_features & DRIVER_GEM) drm_gem_open(dev, priv); if (drm_core_check_feature(dev, DRIVER_PRIME)) drm_prime_init_file_private(&priv->prime); if (dev->driver->open) { ret = dev->driver->open(dev, priv); if (ret < 0) goto out_prime_destroy; } /* if there is no current master make this fd it, but do not create * any master object for render clients */ mutex_lock(&dev->struct_mutex); if (!priv->minor->master && !drm_is_render_client(priv)) { /* create a new master */ priv->minor->master = drm_master_create(priv->minor); if (!priv->minor->master) { mutex_unlock(&dev->struct_mutex); ret = -ENOMEM; goto out_close; } priv->is_master = 1; /* take another reference for the copy in the local file priv */ priv->master = drm_master_get(priv->minor->master); priv->authenticated = 1; mutex_unlock(&dev->struct_mutex); if (dev->driver->master_create) { ret = dev->driver->master_create(dev, priv->master); if (ret) { mutex_lock(&dev->struct_mutex); /* drop both references if this fails */ drm_master_put(&priv->minor->master); drm_master_put(&priv->master); mutex_unlock(&dev->struct_mutex); goto out_close; } } mutex_lock(&dev->struct_mutex); if (dev->driver->master_set) { ret = dev->driver->master_set(dev, priv, true); if (ret) { /* drop both references if this fails */ drm_master_put(&priv->minor->master); drm_master_put(&priv->master); mutex_unlock(&dev->struct_mutex); goto out_close; } } } else if (!drm_is_render_client(priv)) { /* get a reference to the master */ priv->master = drm_master_get(priv->minor->master); } mutex_unlock(&dev->struct_mutex); mutex_lock(&dev->struct_mutex); list_add(&priv->lhead, &dev->filelist); mutex_unlock(&dev->struct_mutex); #ifdef __alpha__ /* * Default the hose */ if (!dev->hose) { struct pci_dev *pci_dev; pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); if (pci_dev) { dev->hose = pci_dev->sysdata; pci_dev_put(pci_dev); } if (!dev->hose) { struct pci_bus *b = pci_bus_b(pci_root_buses.next); if (b) dev->hose = b->sysdata; } } #endif return 0; out_close: if (dev->driver->postclose) dev->driver->postclose(dev, priv); out_prime_destroy: if (drm_core_check_feature(dev, DRIVER_PRIME)) drm_prime_destroy_file_private(&priv->prime); if (dev->driver->driver_features & DRIVER_GEM) drm_gem_release(dev, priv); out_put_pid: put_pid(priv->pid); kfree(priv); filp->private_data = NULL; return ret; } static void drm_master_release(struct drm_device *dev, struct file *filp) { struct drm_file *file_priv = filp->private_data; if (drm_i_have_hw_lock(dev, file_priv)) { DRM_DEBUG("File %p released, freeing lock for context %d\n", filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); drm_lock_free(&file_priv->master->lock, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); } } static void drm_events_release(struct drm_file *file_priv) { struct drm_device *dev = file_priv->minor->dev; struct drm_pending_event *e, *et; struct drm_pending_vblank_event *v, *vt; unsigned long flags; spin_lock_irqsave(&dev->event_lock, flags); /* Remove pending flips */ list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link) if (v->base.file_priv == file_priv) { list_del(&v->base.link); drm_vblank_put(dev, v->pipe); v->base.destroy(&v->base); } /* Remove unconsumed events */ list_for_each_entry_safe(e, et, &file_priv->event_list, link) { list_del(&e->link); e->destroy(e); } spin_unlock_irqrestore(&dev->event_lock, flags); } /** * drm_legacy_dev_reinit * * Reinitializes a legacy/ums drm device in it's lastclose function. */ static void drm_legacy_dev_reinit(struct drm_device *dev) { if (drm_core_check_feature(dev, DRIVER_MODESET)) return; atomic_set(&dev->ioctl_count, 0); atomic_set(&dev->vma_count, 0); dev->sigdata.lock = NULL; dev->context_flag = 0; dev->last_context = 0; dev->if_version = 0; } /** * 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; 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); drm_agp_clear(dev); drm_legacy_sg_cleanup(dev); /* Clear vma list (only built for debugging) */ list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { list_del(&vma->head); kfree(vma); } drm_legacy_dma_takedown(dev); dev->dev_mapping = NULL; mutex_unlock(&dev->struct_mutex); drm_legacy_dev_reinit(dev); DRM_DEBUG("lastclose completed\n"); return 0; } /** * Release file. * * \param inode device inode * \param file_priv DRM file private. * \return zero on success or a negative number on failure. * * If the hardware lock is held then free it, and take it again for the kernel * context since it's necessary to reclaim buffers. Unlink the file private * data from its list and free it. Decreases the open count and if it reaches * zero calls drm_lastclose(). */ int drm_release(struct inode *inode, struct file *filp) { struct drm_file *file_priv = filp->private_data; struct drm_device *dev = file_priv->minor->dev; int retcode = 0; mutex_lock(&drm_global_mutex); DRM_DEBUG("open_count = %d\n", dev->open_count); if (dev->driver->preclose) dev->driver->preclose(dev, file_priv); /* ======================================================== * Begin inline drm_release */ DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", task_pid_nr(current), (long)old_encode_dev(file_priv->minor->device), dev->open_count); /* Release any auth tokens that might point to this file_priv, (do that under the drm_global_mutex) */ if (file_priv->magic) (void) drm_remove_magic(file_priv->master, file_priv->magic); /* if the master has gone away we can't do anything with the lock */ if (file_priv->minor->master) drm_master_release(dev, filp); if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) drm_core_reclaim_buffers(dev, file_priv); drm_events_release(file_priv); if (dev->driver->driver_features & DRIVER_MODESET) drm_fb_release(file_priv);