Initial import

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);