diff options
Diffstat (limited to 'drivers/gpu/drm/drm_fops.c')
| -rw-r--r-- | drivers/gpu/drm/drm_fops.c | 549 |
1 files changed, 549 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c new file mode 100644 index 000000000..076dd606b --- /dev/null +++ b/drivers/gpu/drm/drm_fops.c @@ -0,0 +1,549 @@ +/** + * \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); + +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); |