/** * \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> #include "drm_legacy.h" #include "drm_internal.h" /* from BKL pushdown */ DEFINE_MUTEX(drm_global_mutex); static int drm_open_helper(struct file *filp, struct drm_minor *minor); 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; struct drm_minor *minor; int retcode; int need_setup = 0; minor = drm_minor_acquire(iminor(inode)); if (IS_ERR(minor)) return PTR_ERR(minor); dev = minor->dev; if (!dev->open_count++) need_setup = 1; /* share address_space across all char-devs of a single device */ filp->f_mapping = dev->anon_inode->i_mapping; retcode = drm_open_helper(filp, minor); if (retcode) goto err_undo; if (need_setup) { retcode = drm_setup(dev); if (retcode) goto err_undo; } return 0; err_undo: dev->open_count--; drm_minor_release(minor); return retcode; } EXPORT_SYMBOL(drm_open); /** * 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(__sparc__) && !defined(__sparc_v9__) return 0; /* No cmpxchg before v9 sparc. */ #endif return 1; } /** * Called whenever a process opens /dev/drm. * * \param filp file pointer. * \param minor acquired minor-object. * \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 file *filp, struct drm_minor *minor) { struct drm_device *dev = minor->dev; 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->index); 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 = minor; /* for compatibility root is always authenticated */ priv->authenticated = capable(CAP_SYS_ADMIN); priv->lock_count = 0; INIT_LIST_HEAD(&priv->lhead); INIT_LIST_HEAD(&priv->fbs); mutex_init(&priv->fbs_lock); INIT_LIST_HEAD(&priv->blobs); INIT_LIST_HEAD(&priv->event_list); init_waitqueue_head(&priv->event_wait); priv->event_space = 4096; /* set aside 4k for event buffer */ if (drm_core_check_feature(dev, 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->master_mutex); if (drm_is_primary_client(priv) && !priv->minor->master) { /* create a new master */ priv->minor->master = drm_master_create(priv->minor); if (!priv->minor->master) { 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; if (dev->driver->master_create) { ret = dev->driver->master_create(dev, priv->master); if (ret) { /* drop both references if this fails */ drm_master_put(&priv->minor->master); drm_master_put(&priv->master); goto out_close; } } 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); goto out_close; } } } else if (drm_is_primary_client(priv)) { /* get a reference to the master */ priv->master = drm_master_get(priv->minor->master); } mutex_unlock(&dev->master_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 = list_entry(pci_root_buses.next, struct pci_bus, node); if (b) dev->hose = b->sysdata; } } #endif return 0; out_close: mutex_unlock(&dev->master_mutex); 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 (drm_core_check_feature(dev, DRIVER_GEM)) drm_gem_release(dev, priv); 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_legacy_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_legacy_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; 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) { 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); drm_legacy_vma_flush(dev); drm_legacy_dma_takedown(dev); 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_minor *minor = file_priv->minor; struct drm_device *dev = minor->dev; int retcode = 0; mutex_lock(&drm_global_mutex); DRM_DEBUG("open_count = %d\n", dev->open_count); mutex_lock(&dev->struct_mutex); list_del(&file_priv->lhead); if (file_priv->magic) idr_remove(&file_priv->master->magic_map, file_priv->magic); mutex_unlock(&dev->struct_mutex); 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->kdev->devt), dev->open_count); /* 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_legacy_reclaim_buffers(dev, file_priv); drm_events_release(file_priv); if (drm_core_check_feature(dev, DRIVER_MODESET)) { drm_fb_release(file_priv); drm_property_destroy_user_blobs(dev, file_priv); } if (drm_core_check_feature(dev, DRIVER_GEM)) drm_gem_release(dev, file_priv); drm_legacy_ctxbitmap_flush(dev, file_priv); mutex_lock(&dev->master_mutex); if (file_priv->is_master) { struct drm_master *master = file_priv->master; /** * Since the master is disappearing, so is the * possibility to lock. */ mutex_lock(&dev->struct_mutex); if (master->lock.hw_lock) { if (dev->sigdata.lock == master->lock.hw_lock) dev->sigdata.lock = NULL; master->lock.hw_lock = NULL; master->lock.file_priv = NULL; wake_up_interruptible_all(&master->lock.lock_queue); } mutex_unlock(&dev->struct_mutex); if (file_priv->minor->master == file_priv->master) { /* drop the reference held my the minor */ if (dev->driver->master_drop) dev->driver->master_drop(dev, file_priv, true); drm_master_put(&file_priv->minor->master); } } /* drop the master reference held by the file priv */ if (file_priv->master) drm_master_put(&file_priv->master); file_priv->is_master = 0; mutex_unlock(&dev->master_mutex); if (dev->driver->postclose) dev->driver->postclose(dev, file_priv); if (drm_core_check_feature(dev, DRIVER_PRIME)) drm_prime_destroy_file_private(&file_priv->prime); WARN_ON(!list_empty(&file_priv->event_list)); put_pid(file_priv->pid); kfree(file_priv); /* ======================================================== * End inline drm_release */ if (!--dev->open_count) { retcode = drm_lastclose(dev); if (drm_device_is_unplugged(dev)) drm_put_dev(dev); } mutex_unlock(&drm_global_mutex); drm_minor_release(minor); return retcode; } EXPORT_SYMBOL(drm_release); ssize_t drm_read(struct file *filp, char __user *buffer, size_t count, loff_t *offset) { struct drm_file *file_priv = filp->private_data; struct drm_device *dev = file_priv->minor->dev; ssize_t ret = 0; if (!access_ok(VERIFY_WRITE, buffer, count)) return -EFAULT; spin_lock_irq(&dev->event_lock); for (;;) { if (list_empty(&file_priv->event_list)) { if (ret) break; if (filp->f_flags & O_NONBLOCK) { ret = -EAGAIN; break; } spin_unlock_irq(&dev->event_lock); ret = wait_event_interruptible(file_priv->event_wait, !list_empty(&file_priv->event_list)); spin_lock_irq(&dev->event_lock); if (ret < 0) break; ret = 0; } else { struct drm_pending_event *e; e = list_first_entry(&file_priv->event_list, struct drm_pending_event, link); if (e->event->length + ret > count) break; if (__copy_to_user_inatomic(buffer + ret, e->event, e->event->length)) { if (ret == 0) ret = -EFAULT; break; } file_priv->event_space += e->event->length; ret += e->event->length; list_del(&e->link); e->destroy(e); } } spin_unlock_irq(&dev->event_lock); return ret; } EXPORT_SYMBOL(drm_read); unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) { struct drm_file *file_priv = filp->private_data; unsigned int mask = 0; poll_wait(filp, &file_priv->event_wait, wait); if (!list_empty(&file_priv->event_list)) mask |= POLLIN | POLLRDNORM; return mask; } EXPORT_SYMBOL(drm_poll);