| /** |
| * \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 "drmP.h" |
| #include <linux/poll.h> |
| #include <linux/slab.h> |
| #include <linux/smp_lock.h> |
| |
| static int drm_open_helper(struct inode *inode, struct file *filp, |
| struct drm_device * dev); |
| |
| static int drm_setup(struct drm_device * dev) |
| { |
| int i; |
| int ret; |
| |
| if (dev->driver->firstopen) { |
| ret = dev->driver->firstopen(dev); |
| if (ret != 0) |
| return ret; |
| } |
| |
| atomic_set(&dev->ioctl_count, 0); |
| atomic_set(&dev->vma_count, 0); |
| |
| if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && |
| !drm_core_check_feature(dev, DRIVER_MODESET)) { |
| dev->buf_use = 0; |
| atomic_set(&dev->buf_alloc, 0); |
| |
| i = drm_dma_setup(dev); |
| if (i < 0) |
| return i; |
| } |
| |
| for (i = 0; i < ARRAY_SIZE(dev->counts); i++) |
| atomic_set(&dev->counts[i], 0); |
| |
| dev->sigdata.lock = NULL; |
| |
| dev->queue_count = 0; |
| dev->queue_reserved = 0; |
| dev->queue_slots = 0; |
| dev->queuelist = NULL; |
| dev->context_flag = 0; |
| dev->interrupt_flag = 0; |
| dev->dma_flag = 0; |
| dev->last_context = 0; |
| dev->last_switch = 0; |
| dev->last_checked = 0; |
| init_waitqueue_head(&dev->context_wait); |
| dev->if_version = 0; |
| |
| dev->ctx_start = 0; |
| dev->lck_start = 0; |
| |
| dev->buf_async = NULL; |
| init_waitqueue_head(&dev->buf_readers); |
| init_waitqueue_head(&dev->buf_writers); |
| |
| DRM_DEBUG("\n"); |
| |
| /* |
| * The kernel's context could be created here, but is now created |
| * in drm_dma_enqueue. This is more resource-efficient for |
| * hardware that does not do DMA, but may mean that |
| * drm_select_queue fails between the time the interrupt is |
| * initialized and the time the queues are initialized. |
| */ |
| |
| 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; |
| |
| minor = idr_find(&drm_minors_idr, minor_id); |
| if (!minor) |
| return -ENODEV; |
| |
| if (!(dev = minor->dev)) |
| return -ENODEV; |
| |
| retcode = drm_open_helper(inode, filp, dev); |
| if (!retcode) { |
| atomic_inc(&dev->counts[_DRM_STAT_OPENS]); |
| spin_lock(&dev->count_lock); |
| if (!dev->open_count++) { |
| spin_unlock(&dev->count_lock); |
| retcode = drm_setup(dev); |
| goto out; |
| } |
| spin_unlock(&dev->count_lock); |
| } |
| out: |
| if (!retcode) { |
| mutex_lock(&dev->struct_mutex); |
| if (minor->type == DRM_MINOR_LEGACY) { |
| if (dev->dev_mapping == NULL) |
| dev->dev_mapping = inode->i_mapping; |
| else if (dev->dev_mapping != inode->i_mapping) |
| retcode = -ENODEV; |
| } |
| mutex_unlock(&dev->struct_mutex); |
| } |
| |
| 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 *old_fops; |
| |
| DRM_DEBUG("\n"); |
| |
| /* BKL pushdown: note that nothing else serializes idr_find() */ |
| lock_kernel(); |
| minor = idr_find(&drm_minors_idr, minor_id); |
| if (!minor) |
| goto out; |
| |
| if (!(dev = minor->dev)) |
| goto out; |
| |
| old_fops = filp->f_op; |
| filp->f_op = fops_get(&dev->driver->fops); |
| if (filp->f_op == NULL) { |
| filp->f_op = old_fops; |
| goto out; |
| } |
| if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) { |
| fops_put(filp->f_op); |
| filp->f_op = fops_get(old_fops); |
| } |
| fops_put(old_fops); |
| |
| out: |
| unlock_kernel(); |
| 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; |
| |
| DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id); |
| |
| priv = kmalloc(sizeof(*priv), GFP_KERNEL); |
| if (!priv) |
| return -ENOMEM; |
| |
| memset(priv, 0, sizeof(*priv)); |
| filp->private_data = priv; |
| priv->filp = filp; |
| priv->uid = current_euid(); |
| priv->pid = task_pid_nr(current); |
| priv->minor = idr_find(&drm_minors_idr, minor_id); |
| priv->ioctl_count = 0; |
| /* 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); |
| 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 (dev->driver->open) { |
| ret = dev->driver->open(dev, priv); |
| if (ret < 0) |
| goto out_free; |
| } |
| |
| |
| /* if there is no current master make this fd it */ |
| mutex_lock(&dev->struct_mutex); |
| if (!priv->minor->master) { |
| /* 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_free; |
| } |
| |
| 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_free; |
| } |
| } |
| 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_free; |
| } |
| } |
| mutex_unlock(&dev->struct_mutex); |
| } else { |
| /* 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_free: |
| kfree(priv); |
| filp->private_data = NULL; |
| return ret; |
| } |
| |
| /** No-op. */ |
| int drm_fasync(int fd, struct file *filp, int on) |
| { |
| struct drm_file *priv = filp->private_data; |
| struct drm_device *dev = priv->minor->dev; |
| |
| DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, |
| (long)old_encode_dev(priv->minor->device)); |
| return fasync_helper(fd, filp, on, &dev->buf_async); |
| } |
| EXPORT_SYMBOL(drm_fasync); |
| |
| /* |
| * Reclaim locked buffers; note that this may be a bad idea if the current |
| * context doesn't have the hw lock... |
| */ |
| static void drm_reclaim_locked_buffers(struct drm_device *dev, struct file *f) |
| { |
| struct drm_file *file_priv = f->private_data; |
| |
| if (drm_i_have_hw_lock(dev, file_priv)) { |
| dev->driver->reclaim_buffers_locked(dev, file_priv); |
| } else { |
| unsigned long _end = jiffies + 3 * DRM_HZ; |
| int locked = 0; |
| |
| drm_idlelock_take(&file_priv->master->lock); |
| |
| /* |
| * Wait for a while. |
| */ |
| do { |
| spin_lock_bh(&file_priv->master->lock.spinlock); |
| locked = file_priv->master->lock.idle_has_lock; |
| spin_unlock_bh(&file_priv->master->lock.spinlock); |
| if (locked) |
| break; |
| schedule(); |
| } while (!time_after_eq(jiffies, _end)); |
| |
| if (!locked) { |
| DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n" |
| "\tdriver to use reclaim_buffers_idlelocked() instead.\n" |
| "\tI will go on reclaiming the buffers anyway.\n"); |
| } |
| |
| dev->driver->reclaim_buffers_locked(dev, file_priv); |
| drm_idlelock_release(&file_priv->master->lock); |
| } |
| } |
| |
| static void drm_master_release(struct drm_device *dev, struct file *filp) |
| { |
| struct drm_file *file_priv = filp->private_data; |
| |
| if (dev->driver->reclaim_buffers_locked && |
| file_priv->master->lock.hw_lock) |
| drm_reclaim_locked_buffers(dev, filp); |
| |
| if (dev->driver->reclaim_buffers_idlelocked && |
| file_priv->master->lock.hw_lock) { |
| drm_idlelock_take(&file_priv->master->lock); |
| dev->driver->reclaim_buffers_idlelocked(dev, file_priv); |
| drm_idlelock_release(&file_priv->master->lock); |
| } |
| |
| |
| 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)); |
| } |
| |
| if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && |
| !dev->driver->reclaim_buffers_locked) { |
| dev->driver->reclaim_buffers(dev, file_priv); |
| } |
| } |
| |
| 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) |
| e->destroy(e); |
| |
| spin_unlock_irqrestore(&dev->event_lock, flags); |
| } |
| |
| /** |
| * 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; |
| |
| lock_kernel(); |
| |
| 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); |
| |
| /* if the master has gone away we can't do anything with the lock */ |
| if (file_priv->minor->master) |
| drm_master_release(dev, filp); |
| |
| drm_events_release(file_priv); |
| |
| if (dev->driver->driver_features & DRIVER_GEM) |
| drm_gem_release(dev, file_priv); |
| |
| if (dev->driver->driver_features & DRIVER_MODESET) |
| drm_fb_release(file_priv); |
| |
| mutex_lock(&dev->ctxlist_mutex); |
| if (!list_empty(&dev->ctxlist)) { |
| struct drm_ctx_list *pos, *n; |
| |
| list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { |
| if (pos->tag == file_priv && |
| pos->handle != DRM_KERNEL_CONTEXT) { |
| if (dev->driver->context_dtor) |
| dev->driver->context_dtor(dev, |
| pos->handle); |
| |
| drm_ctxbitmap_free(dev, pos->handle); |
| |
| list_del(&pos->head); |
| kfree(pos); |
| --dev->ctx_count; |
| } |
| } |
| } |
| mutex_unlock(&dev->ctxlist_mutex); |
| |
| mutex_lock(&dev->struct_mutex); |
| |
| if (file_priv->is_master) { |
| struct drm_master *master = file_priv->master; |
| struct drm_file *temp; |
| list_for_each_entry(temp, &dev->filelist, lhead) { |
| if ((temp->master == file_priv->master) && |
| (temp != file_priv)) |
| temp->authenticated = 0; |
| } |
| |
| /** |
| * Since the master is disappearing, so is the |
| * possibility to lock. |
| */ |
| |
| 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); |
| } |
| |
| 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 reference held my the file priv */ |
| drm_master_put(&file_priv->master); |
| file_priv->is_master = 0; |
| list_del(&file_priv->lhead); |
| mutex_unlock(&dev->struct_mutex); |
| |
| if (dev->driver->postclose) |
| dev->driver->postclose(dev, file_priv); |
| kfree(file_priv); |
| |
| /* ======================================================== |
| * End inline drm_release |
| */ |
| |
| atomic_inc(&dev->counts[_DRM_STAT_CLOSES]); |
| spin_lock(&dev->count_lock); |
| if (!--dev->open_count) { |
| if (atomic_read(&dev->ioctl_count)) { |
| DRM_ERROR("Device busy: %d\n", |
| atomic_read(&dev->ioctl_count)); |
| spin_unlock(&dev->count_lock); |
| unlock_kernel(); |
| return -EBUSY; |
| } |
| spin_unlock(&dev->count_lock); |
| unlock_kernel(); |
| return drm_lastclose(dev); |
| } |
| spin_unlock(&dev->count_lock); |
| |
| unlock_kernel(); |
| |
| 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; |
| |
| 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; |
| break; |
| } |
| |
| total += e->event->length; |
| e->destroy(e); |
| } |
| |
| return total; |
| } |
| 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); |