| /** |
| * \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->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); |
| 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); |
| |
| /* 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_legacy_reclaim_buffers(dev, file_priv); |
| |
| drm_events_release(file_priv); |
| |
| if (drm_core_check_feature(dev, DRIVER_MODESET)) |
| drm_fb_release(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); |
| |
| static bool |
| drm_dequeue_event(struct drm_file *file_priv, |
| size_t total, size_t max, struct drm_pending_event **out) |
| { |
| struct drm_device *dev = file_priv->minor->dev; |
| struct drm_pending_event *e; |
| unsigned long flags; |
| bool ret = false; |
| |
| spin_lock_irqsave(&dev->event_lock, flags); |
| |
| *out = NULL; |
| if (list_empty(&file_priv->event_list)) |
| goto out; |
| e = list_first_entry(&file_priv->event_list, |
| struct drm_pending_event, link); |
| if (e->event->length + total > max) |
| goto out; |
| |
| file_priv->event_space += e->event->length; |
| list_del(&e->link); |
| *out = e; |
| ret = true; |
| |
| out: |
| spin_unlock_irqrestore(&dev->event_lock, flags); |
| return ret; |
| } |
| |
| 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_pending_event *e; |
| size_t total; |
| ssize_t ret; |
| |
| if ((filp->f_flags & O_NONBLOCK) == 0) { |
| ret = wait_event_interruptible(file_priv->event_wait, |
| !list_empty(&file_priv->event_list)); |
| if (ret < 0) |
| return ret; |
| } |
| |
| total = 0; |
| while (drm_dequeue_event(file_priv, total, count, &e)) { |
| if (copy_to_user(buffer + total, |
| e->event, e->event->length)) { |
| total = -EFAULT; |
| e->destroy(e); |
| break; |
| } |
| |
| total += e->event->length; |
| e->destroy(e); |
| } |
| |
| return total ?: -EAGAIN; |
| } |
| 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); |