--- /dev/null
+/**
+ * \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);
Code Review / kvmfornfv.git / blobdiff