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![Ilija Hadzic](/assets/img/avatar_default.png)
inode argument is no longer in use (cf. f4aede2e3
).
Remove it.
Signed-off-by: Ilija Hadzic <ihadzic@research.bell-labs.com>
Cc: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
626 lines
16 KiB
C
626 lines
16 KiB
C
/**
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* \file drm_fops.c
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* File operations for DRM
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Daryll Strauss <daryll@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <drm/drmP.h>
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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/* from BKL pushdown */
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DEFINE_MUTEX(drm_global_mutex);
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EXPORT_SYMBOL(drm_global_mutex);
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static int drm_open_helper(struct file *filp, struct drm_minor *minor);
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static int drm_setup(struct drm_device * dev)
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{
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int ret;
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if (dev->driver->firstopen &&
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!drm_core_check_feature(dev, DRIVER_MODESET)) {
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ret = dev->driver->firstopen(dev);
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if (ret != 0)
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return ret;
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}
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ret = drm_legacy_dma_setup(dev);
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if (ret < 0)
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return ret;
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DRM_DEBUG("\n");
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return 0;
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}
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/**
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* Open file.
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*
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* \param inode device inode
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* \param filp file pointer.
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* \return zero on success or a negative number on failure.
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*
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* Searches the DRM device with the same minor number, calls open_helper(), and
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* increments the device open count. If the open count was previous at zero,
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* i.e., it's the first that the device is open, then calls setup().
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*/
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int drm_open(struct inode *inode, struct file *filp)
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{
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struct drm_device *dev;
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struct drm_minor *minor;
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int retcode;
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int need_setup = 0;
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minor = drm_minor_acquire(iminor(inode));
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if (IS_ERR(minor))
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return PTR_ERR(minor);
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dev = minor->dev;
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if (!dev->open_count++)
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need_setup = 1;
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/* share address_space across all char-devs of a single device */
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filp->f_mapping = dev->anon_inode->i_mapping;
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retcode = drm_open_helper(filp, minor);
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if (retcode)
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goto err_undo;
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if (need_setup) {
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retcode = drm_setup(dev);
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if (retcode)
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goto err_undo;
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}
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return 0;
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err_undo:
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dev->open_count--;
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drm_minor_release(minor);
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return retcode;
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}
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EXPORT_SYMBOL(drm_open);
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/**
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* File \c open operation.
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*
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* \param inode device inode.
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* \param filp file pointer.
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*
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* Puts the dev->fops corresponding to the device minor number into
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* \p filp, call the \c open method, and restore the file operations.
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*/
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int drm_stub_open(struct inode *inode, struct file *filp)
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{
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struct drm_device *dev;
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struct drm_minor *minor;
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int err = -ENODEV;
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const struct file_operations *new_fops;
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DRM_DEBUG("\n");
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mutex_lock(&drm_global_mutex);
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minor = drm_minor_acquire(iminor(inode));
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if (IS_ERR(minor))
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goto out_unlock;
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dev = minor->dev;
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new_fops = fops_get(dev->driver->fops);
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if (!new_fops)
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goto out_release;
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replace_fops(filp, new_fops);
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if (filp->f_op->open)
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err = filp->f_op->open(inode, filp);
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out_release:
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drm_minor_release(minor);
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out_unlock:
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mutex_unlock(&drm_global_mutex);
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return err;
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}
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/**
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* Check whether DRI will run on this CPU.
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*
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* \return non-zero if the DRI will run on this CPU, or zero otherwise.
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*/
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static int drm_cpu_valid(void)
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{
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#if defined(__i386__)
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if (boot_cpu_data.x86 == 3)
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return 0; /* No cmpxchg on a 386 */
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#endif
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#if defined(__sparc__) && !defined(__sparc_v9__)
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return 0; /* No cmpxchg before v9 sparc. */
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#endif
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return 1;
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}
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/**
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* Called whenever a process opens /dev/drm.
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*
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* \param filp file pointer.
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* \param minor acquired minor-object.
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* \return zero on success or a negative number on failure.
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*
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* Creates and initializes a drm_file structure for the file private data in \p
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* filp and add it into the double linked list in \p dev.
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*/
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static int drm_open_helper(struct file *filp, struct drm_minor *minor)
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{
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struct drm_device *dev = minor->dev;
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struct drm_file *priv;
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int ret;
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if (filp->f_flags & O_EXCL)
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return -EBUSY; /* No exclusive opens */
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if (!drm_cpu_valid())
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return -EINVAL;
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if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
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return -EINVAL;
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DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor->index);
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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filp->private_data = priv;
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priv->filp = filp;
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priv->uid = current_euid();
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priv->pid = get_pid(task_pid(current));
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priv->minor = minor;
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/* for compatibility root is always authenticated */
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priv->always_authenticated = capable(CAP_SYS_ADMIN);
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priv->authenticated = priv->always_authenticated;
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priv->lock_count = 0;
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INIT_LIST_HEAD(&priv->lhead);
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INIT_LIST_HEAD(&priv->fbs);
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mutex_init(&priv->fbs_lock);
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INIT_LIST_HEAD(&priv->event_list);
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init_waitqueue_head(&priv->event_wait);
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priv->event_space = 4096; /* set aside 4k for event buffer */
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if (dev->driver->driver_features & DRIVER_GEM)
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drm_gem_open(dev, priv);
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if (drm_core_check_feature(dev, DRIVER_PRIME))
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drm_prime_init_file_private(&priv->prime);
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if (dev->driver->open) {
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ret = dev->driver->open(dev, priv);
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if (ret < 0)
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goto out_prime_destroy;
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}
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/* if there is no current master make this fd it, but do not create
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* any master object for render clients */
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mutex_lock(&dev->master_mutex);
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if (drm_is_primary_client(priv) && !priv->minor->master) {
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/* create a new master */
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priv->minor->master = drm_master_create(priv->minor);
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if (!priv->minor->master) {
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ret = -ENOMEM;
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goto out_close;
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}
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priv->is_master = 1;
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/* take another reference for the copy in the local file priv */
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priv->master = drm_master_get(priv->minor->master);
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priv->authenticated = 1;
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if (dev->driver->master_create) {
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ret = dev->driver->master_create(dev, priv->master);
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if (ret) {
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/* drop both references if this fails */
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drm_master_put(&priv->minor->master);
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drm_master_put(&priv->master);
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goto out_close;
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}
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}
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if (dev->driver->master_set) {
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ret = dev->driver->master_set(dev, priv, true);
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if (ret) {
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/* drop both references if this fails */
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drm_master_put(&priv->minor->master);
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drm_master_put(&priv->master);
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goto out_close;
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}
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}
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} else if (drm_is_primary_client(priv)) {
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/* get a reference to the master */
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priv->master = drm_master_get(priv->minor->master);
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}
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mutex_unlock(&dev->master_mutex);
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mutex_lock(&dev->struct_mutex);
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list_add(&priv->lhead, &dev->filelist);
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mutex_unlock(&dev->struct_mutex);
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#ifdef __alpha__
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/*
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* Default the hose
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*/
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if (!dev->hose) {
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struct pci_dev *pci_dev;
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pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
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if (pci_dev) {
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dev->hose = pci_dev->sysdata;
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pci_dev_put(pci_dev);
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}
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if (!dev->hose) {
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struct pci_bus *b = list_entry(pci_root_buses.next,
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struct pci_bus, node);
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if (b)
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dev->hose = b->sysdata;
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}
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}
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#endif
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return 0;
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out_close:
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mutex_unlock(&dev->master_mutex);
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if (dev->driver->postclose)
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dev->driver->postclose(dev, priv);
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out_prime_destroy:
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if (drm_core_check_feature(dev, DRIVER_PRIME))
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drm_prime_destroy_file_private(&priv->prime);
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if (dev->driver->driver_features & DRIVER_GEM)
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drm_gem_release(dev, priv);
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put_pid(priv->pid);
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kfree(priv);
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filp->private_data = NULL;
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return ret;
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}
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static void drm_master_release(struct drm_device *dev, struct file *filp)
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{
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struct drm_file *file_priv = filp->private_data;
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if (drm_i_have_hw_lock(dev, file_priv)) {
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DRM_DEBUG("File %p released, freeing lock for context %d\n",
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filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
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drm_lock_free(&file_priv->master->lock,
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_DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
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}
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}
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static void drm_events_release(struct drm_file *file_priv)
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{
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struct drm_device *dev = file_priv->minor->dev;
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struct drm_pending_event *e, *et;
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struct drm_pending_vblank_event *v, *vt;
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unsigned long flags;
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spin_lock_irqsave(&dev->event_lock, flags);
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/* Remove pending flips */
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list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link)
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if (v->base.file_priv == file_priv) {
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list_del(&v->base.link);
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drm_vblank_put(dev, v->pipe);
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v->base.destroy(&v->base);
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}
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/* Remove unconsumed events */
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list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
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list_del(&e->link);
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e->destroy(e);
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}
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spin_unlock_irqrestore(&dev->event_lock, flags);
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}
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/**
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* drm_legacy_dev_reinit
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*
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* Reinitializes a legacy/ums drm device in it's lastclose function.
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*/
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static void drm_legacy_dev_reinit(struct drm_device *dev)
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{
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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return;
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dev->sigdata.lock = NULL;
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dev->context_flag = 0;
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dev->last_context = 0;
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dev->if_version = 0;
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}
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/**
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* Take down the DRM device.
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*
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* \param dev DRM device structure.
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*
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* Frees every resource in \p dev.
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*
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* \sa drm_device
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*/
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int drm_lastclose(struct drm_device * dev)
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{
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struct drm_vma_entry *vma, *vma_temp;
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DRM_DEBUG("\n");
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if (dev->driver->lastclose)
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dev->driver->lastclose(dev);
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DRM_DEBUG("driver lastclose completed\n");
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if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
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drm_irq_uninstall(dev);
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mutex_lock(&dev->struct_mutex);
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drm_agp_clear(dev);
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drm_legacy_sg_cleanup(dev);
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/* Clear vma list (only built for debugging) */
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list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
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list_del(&vma->head);
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kfree(vma);
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}
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drm_legacy_dma_takedown(dev);
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mutex_unlock(&dev->struct_mutex);
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drm_legacy_dev_reinit(dev);
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DRM_DEBUG("lastclose completed\n");
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return 0;
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}
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/**
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* Release file.
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*
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* \param inode device inode
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* \param file_priv DRM file private.
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* \return zero on success or a negative number on failure.
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*
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* If the hardware lock is held then free it, and take it again for the kernel
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* context since it's necessary to reclaim buffers. Unlink the file private
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* data from its list and free it. Decreases the open count and if it reaches
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* zero calls drm_lastclose().
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*/
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int drm_release(struct inode *inode, struct file *filp)
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{
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struct drm_file *file_priv = filp->private_data;
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struct drm_minor *minor = file_priv->minor;
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struct drm_device *dev = minor->dev;
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int retcode = 0;
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mutex_lock(&drm_global_mutex);
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DRM_DEBUG("open_count = %d\n", dev->open_count);
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if (dev->driver->preclose)
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dev->driver->preclose(dev, file_priv);
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/* ========================================================
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* Begin inline drm_release
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*/
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DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
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task_pid_nr(current),
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(long)old_encode_dev(file_priv->minor->kdev->devt),
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dev->open_count);
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/* Release any auth tokens that might point to this file_priv,
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(do that under the drm_global_mutex) */
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if (file_priv->magic)
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(void) drm_remove_magic(file_priv->master, file_priv->magic);
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/* if the master has gone away we can't do anything with the lock */
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if (file_priv->minor->master)
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drm_master_release(dev, filp);
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if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
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drm_core_reclaim_buffers(dev, file_priv);
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drm_events_release(file_priv);
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if (dev->driver->driver_features & DRIVER_MODESET)
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drm_fb_release(file_priv);
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if (dev->driver->driver_features & DRIVER_GEM)
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drm_gem_release(dev, file_priv);
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mutex_lock(&dev->ctxlist_mutex);
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if (!list_empty(&dev->ctxlist)) {
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struct drm_ctx_list *pos, *n;
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list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
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if (pos->tag == file_priv &&
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pos->handle != DRM_KERNEL_CONTEXT) {
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if (dev->driver->context_dtor)
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dev->driver->context_dtor(dev,
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pos->handle);
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drm_ctxbitmap_free(dev, pos->handle);
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list_del(&pos->head);
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kfree(pos);
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}
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}
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}
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mutex_unlock(&dev->ctxlist_mutex);
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mutex_lock(&dev->master_mutex);
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if (file_priv->is_master) {
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struct drm_master *master = file_priv->master;
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struct drm_file *temp;
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mutex_lock(&dev->struct_mutex);
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list_for_each_entry(temp, &dev->filelist, lhead) {
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if ((temp->master == file_priv->master) &&
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(temp != file_priv))
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temp->authenticated = temp->always_authenticated;
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}
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/**
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* Since the master is disappearing, so is the
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* possibility to lock.
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*/
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if (master->lock.hw_lock) {
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if (dev->sigdata.lock == master->lock.hw_lock)
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dev->sigdata.lock = NULL;
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master->lock.hw_lock = NULL;
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master->lock.file_priv = NULL;
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wake_up_interruptible_all(&master->lock.lock_queue);
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}
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mutex_unlock(&dev->struct_mutex);
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if (file_priv->minor->master == file_priv->master) {
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/* drop the reference held my the minor */
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if (dev->driver->master_drop)
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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);
|
|
|
|
mutex_lock(&dev->struct_mutex);
|
|
list_del(&file_priv->lhead);
|
|
mutex_unlock(&dev->struct_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);
|
|
|
|
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;
|
|
|
|
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);
|