f116cc561e
Signed-off-by: Dave Airlie <airlied@redhat.com>
467 lines
12 KiB
C
467 lines
12 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 "drmP.h"
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#include "drm_sarea.h"
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#include <linux/poll.h>
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static int drm_open_helper(struct inode *inode, struct file *filp,
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struct drm_device * dev);
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static int drm_setup(struct drm_device * dev)
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{
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drm_local_map_t *map;
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int i;
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int ret;
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u32 sareapage;
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if (dev->driver->firstopen) {
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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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dev->magicfree.next = NULL;
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/* prebuild the SAREA */
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sareapage = max_t(unsigned, SAREA_MAX, PAGE_SIZE);
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i = drm_addmap(dev, 0, sareapage, _DRM_SHM, _DRM_CONTAINS_LOCK, &map);
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if (i != 0)
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return i;
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atomic_set(&dev->ioctl_count, 0);
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atomic_set(&dev->vma_count, 0);
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dev->buf_use = 0;
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atomic_set(&dev->buf_alloc, 0);
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if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
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i = drm_dma_setup(dev);
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if (i < 0)
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return i;
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}
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for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
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atomic_set(&dev->counts[i], 0);
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drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER);
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INIT_LIST_HEAD(&dev->magicfree);
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dev->sigdata.lock = NULL;
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init_waitqueue_head(&dev->lock.lock_queue);
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dev->queue_count = 0;
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dev->queue_reserved = 0;
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dev->queue_slots = 0;
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dev->queuelist = NULL;
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dev->irq_enabled = 0;
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dev->context_flag = 0;
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dev->interrupt_flag = 0;
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dev->dma_flag = 0;
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dev->last_context = 0;
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dev->last_switch = 0;
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dev->last_checked = 0;
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init_waitqueue_head(&dev->context_wait);
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dev->if_version = 0;
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dev->ctx_start = 0;
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dev->lck_start = 0;
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dev->buf_async = NULL;
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init_waitqueue_head(&dev->buf_readers);
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init_waitqueue_head(&dev->buf_writers);
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DRM_DEBUG("\n");
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/*
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* The kernel's context could be created here, but is now created
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* in drm_dma_enqueue. This is more resource-efficient for
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* hardware that does not do DMA, but may mean that
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* drm_select_queue fails between the time the interrupt is
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* initialized and the time the queues are initialized.
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*/
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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 = NULL;
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int minor_id = iminor(inode);
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struct drm_minor *minor;
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int retcode = 0;
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minor = idr_find(&drm_minors_idr, minor_id);
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if (!minor)
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return -ENODEV;
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if (!(dev = minor->dev))
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return -ENODEV;
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retcode = drm_open_helper(inode, filp, dev);
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if (!retcode) {
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atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
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spin_lock(&dev->count_lock);
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if (!dev->open_count++) {
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spin_unlock(&dev->count_lock);
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return drm_setup(dev);
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}
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spin_unlock(&dev->count_lock);
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}
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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 = NULL;
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struct drm_minor *minor;
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int minor_id = iminor(inode);
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int err = -ENODEV;
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const struct file_operations *old_fops;
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DRM_DEBUG("\n");
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minor = idr_find(&drm_minors_idr, minor_id);
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if (!minor)
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return -ENODEV;
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if (!(dev = minor->dev))
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return -ENODEV;
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old_fops = filp->f_op;
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filp->f_op = fops_get(&dev->driver->fops);
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if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
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fops_put(filp->f_op);
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filp->f_op = fops_get(old_fops);
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}
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fops_put(old_fops);
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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 inode device inode.
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* \param filp file pointer.
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* \param dev device.
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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 inode *inode, struct file *filp,
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struct drm_device * dev)
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{
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int minor_id = iminor(inode);
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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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DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id);
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priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
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if (!priv)
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return -ENOMEM;
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memset(priv, 0, sizeof(*priv));
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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 = task_pid_nr(current);
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priv->minor = idr_find(&drm_minors_idr, minor_id);
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priv->ioctl_count = 0;
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/* for compatibility root is always authenticated */
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priv->authenticated = capable(CAP_SYS_ADMIN);
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priv->lock_count = 0;
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INIT_LIST_HEAD(&priv->lhead);
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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_free;
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}
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mutex_lock(&dev->struct_mutex);
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if (list_empty(&dev->filelist))
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priv->master = 1;
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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 = pci_bus_b(pci_root_buses.next);
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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_free:
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drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
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filp->private_data = NULL;
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return ret;
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}
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/** No-op. */
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int drm_fasync(int fd, struct file *filp, int on)
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{
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struct drm_file *priv = filp->private_data;
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struct drm_device *dev = priv->minor->dev;
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int retcode;
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DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
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(long)old_encode_dev(priv->minor->device));
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retcode = fasync_helper(fd, filp, on, &dev->buf_async);
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if (retcode < 0)
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return retcode;
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return 0;
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}
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EXPORT_SYMBOL(drm_fasync);
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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_device *dev = file_priv->minor->dev;
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int retcode = 0;
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lock_kernel();
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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->device),
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dev->open_count);
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if (dev->driver->reclaim_buffers_locked && dev->lock.hw_lock) {
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if (drm_i_have_hw_lock(dev, file_priv)) {
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dev->driver->reclaim_buffers_locked(dev, file_priv);
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} else {
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unsigned long endtime = jiffies + 3 * DRM_HZ;
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int locked = 0;
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drm_idlelock_take(&dev->lock);
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/*
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* Wait for a while.
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*/
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do{
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spin_lock_bh(&dev->lock.spinlock);
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locked = dev->lock.idle_has_lock;
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spin_unlock_bh(&dev->lock.spinlock);
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if (locked)
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break;
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schedule();
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} while (!time_after_eq(jiffies, endtime));
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if (!locked) {
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DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n"
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"\tdriver to use reclaim_buffers_idlelocked() instead.\n"
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"\tI will go on reclaiming the buffers anyway.\n");
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}
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dev->driver->reclaim_buffers_locked(dev, file_priv);
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drm_idlelock_release(&dev->lock);
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}
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}
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if (dev->driver->reclaim_buffers_idlelocked && dev->lock.hw_lock) {
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drm_idlelock_take(&dev->lock);
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dev->driver->reclaim_buffers_idlelocked(dev, file_priv);
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drm_idlelock_release(&dev->lock);
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}
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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(dev->lock.hw_lock->lock));
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drm_lock_free(&dev->lock,
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_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
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}
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if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
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!dev->driver->reclaim_buffers_locked) {
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dev->driver->reclaim_buffers(dev, file_priv);
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}
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drm_fasync(-1, filp, 0);
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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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drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
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--dev->ctx_count;
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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->struct_mutex);
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if (file_priv->remove_auth_on_close == 1) {
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struct drm_file *temp;
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list_for_each_entry(temp, &dev->filelist, lhead)
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temp->authenticated = 0;
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}
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list_del(&file_priv->lhead);
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mutex_unlock(&dev->struct_mutex);
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if (dev->driver->postclose)
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dev->driver->postclose(dev, file_priv);
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drm_free(file_priv, sizeof(*file_priv), DRM_MEM_FILES);
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/* ========================================================
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* End inline drm_release
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*/
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atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
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spin_lock(&dev->count_lock);
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if (!--dev->open_count) {
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if (atomic_read(&dev->ioctl_count) || dev->blocked) {
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DRM_ERROR("Device busy: %d %d\n",
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atomic_read(&dev->ioctl_count), dev->blocked);
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spin_unlock(&dev->count_lock);
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unlock_kernel();
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return -EBUSY;
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}
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spin_unlock(&dev->count_lock);
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unlock_kernel();
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return drm_lastclose(dev);
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}
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spin_unlock(&dev->count_lock);
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unlock_kernel();
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return retcode;
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}
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EXPORT_SYMBOL(drm_release);
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/** No-op. */
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unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
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{
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return 0;
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}
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EXPORT_SYMBOL(drm_poll);
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