/**
* \file drm_fops.c
* File operations for DRM
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Daryll Strauss <daryll@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
*
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "drmP.h"
#include <linux/poll.h>
static int drm_open_helper(struct inode *inode, struct file *filp,
drm_device_t * dev);
static int drm_setup(drm_device_t * dev)
{
int i;
int ret;
if (dev->driver->firstopen) {
ret = dev->driver->firstopen(dev);
if (ret != 0)
return ret;
}
atomic_set(&dev->ioctl_count, 0);
atomic_set(&dev->vma_count, 0);
dev->buf_use = 0;
atomic_set(&dev->buf_alloc, 0);
if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
i = drm_dma_setup(dev);
if (i < 0)
return i;
}
for (i = 0; i < DRM_ARRAY_SIZE(dev->counts); i++)
atomic_set(&dev->counts[i], 0);
for (i = 0; i < DRM_HASH_SIZE; i++) {
dev->magiclist[i].head = NULL;
dev->magiclist[i].tail = NULL;
}
dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist), DRM_MEM_CTXLIST);
if (dev->ctxlist == NULL)
return -ENOMEM;
memset(dev->ctxlist, 0, sizeof(*dev->ctxlist));
INIT_LIST_HEAD(&dev->ctxlist->head);
dev->vmalist = NULL;
dev->sigdata.lock = dev->lock.hw_lock = NULL;
init_waitqueue_head(&dev->lock.lock_queue);
dev->queue_count = 0;
dev->queue_reserved = 0;
dev->queue_slots = 0;
dev->queuelist = NULL;
dev->irq_enabled = 0;
dev->context_flag = 0;
dev->interrupt_flag = 0;
dev->dma_flag = 0;
dev->last_context = 0;
dev->last_switch = 0;
dev->last_checked = 0;
init_waitqueue_head(&dev->context_wait);
dev->if_version = 0;
dev->ctx_start = 0;
dev->lck_start = 0;
dev->buf_async = NULL;
init_waitqueue_head(&dev->buf_readers);
init_waitqueue_head(&dev->buf_writers);
DRM_DEBUG("\n");
/*
* The kernel's context could be created here, but is now created
* in drm_dma_enqueue. This is more resource-efficient for
* hardware that does not do DMA, but may mean that
* drm_select_queue fails between the time the interrupt is
* initialized and the time the queues are initialized.
*/
return 0;
}
/**
* Open file.
*
* \param inode device inode
* \param filp file pointer.
* \return zero on success or a negative number on failure.
*
* Searches the DRM device with the same minor number, calls open_helper(), and
* increments the device open count. If the open count was previous at zero,
* i.e., it's the first that the device is open, then calls setup().
*/
int drm_open(struct inode *inode, struct file *filp)
{
drm_device_t *dev = NULL;
int minor = iminor(inode);
int retcode = 0;
if (!((minor >= 0) && (minor < drm_cards_limit)))
return -ENODEV;
if (!drm_heads[minor])
return -ENODEV;
if (!(dev = drm_heads[minor]->dev))
return -ENODEV;
retcode = drm_open_helper(inode, filp, dev);
if (!retcode) {
atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
spin_lock(&dev->count_lock);
if (!dev->open_count++) {
spin_unlock(&dev->count_lock);
return drm_setup(dev);
}
spin_unlock(&dev->count_lock);
}
return retcode;
}
EXPORT_SYMBOL(drm_open);
/**
* Release file.
*
* \param inode device inode
* \param filp file pointer.
* \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)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev;
int retcode = 0;
lock_kernel();
dev = priv->head->dev;
DRM_DEBUG("open_count = %d\n", dev->open_count);
if (dev->driver->preclose)
dev->driver->preclose(dev, filp);
/* ========================================================
* Begin inline drm_release
*/
DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
current->pid, (long)old_encode_dev(priv->head->device),
dev->open_count);
if (priv->lock_count && dev->lock.hw_lock &&
_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) &&
dev->lock.filp == filp) {
DRM_DEBUG("File %p released, freeing lock for context %d\n",
filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
if (dev->driver->reclaim_buffers_locked)
dev->driver->reclaim_buffers_locked(dev, filp);
drm_lock_free(dev, &dev->lock.hw_lock->lock,
_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
/* FIXME: may require heavy-handed reset of
hardware at this point, possibly
processed via a callback to the X
server. */
} else if (dev->driver->reclaim_buffers_locked && priv->lock_count
&& dev->lock.hw_lock) {
/* The lock is required to reclaim buffers */
DECLARE_WAITQUEUE(entry, current);
add_wait_queue(&dev->lock.lock_queue, &entry);
for (;;) {
__set_current_state(TASK_INTERRUPTIBLE);
if (!dev->lock.hw_lock) {
/* Device has been unregistered */
retcode = -EINTR;
break;
}
if (drm_lock_take(&dev->lock.hw_lock->lock,
DRM_KERNEL_CONTEXT)) {
dev->lock.filp = filp;
dev->lock.lock_time = jiffies;
atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
break; /* Got lock */
}
/* Contention */
schedule();
if (signal_pending(current)) {
retcode = -ERESTARTSYS;
break;
}
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&dev->lock.lock_queue, &entry);
if (!retcode) {
dev->driver->reclaim_buffers_locked(dev, filp);
drm_lock_free(dev, &dev->lock.hw_lock->lock,
DRM_KERNEL_CONTEXT);
}
}
if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
!dev->driver->reclaim_buffers_locked) {
dev->driver->reclaim_buffers(dev, filp);
}
drm_fasync(-1, filp, 0);
down(&dev->ctxlist_sem);
if (dev->ctxlist && (!list_empty(&dev->ctxlist->head))) {
drm_ctx_list_t *pos, *n;
list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) {
if (pos->tag == priv &&
pos->handle != DRM_KERNEL_CONTEXT) {
if (dev->driver->context_dtor)
dev->driver->context_dtor(dev,
pos->handle);
drm_ctxbitmap_free(dev, pos->handle);
list_del(&pos->head);
drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
--dev->ctx_count;
}
}
}
up(&dev->ctxlist_sem);
down(&dev->struct_sem);
if (priv->remove_auth_on_close == 1) {
drm_file_t *temp = dev->file_first;
while (temp) {
temp->authenticated = 0;
temp = temp->next;
}
}
if (priv->prev) {
priv->prev->next = priv->next;
} else {
dev->file_first = priv->next;
}
if (priv->next) {
priv->next->prev = priv->prev;
} else {
dev->file_last = priv->prev;
}
up(&dev->struct_sem);
if (dev->driver->postclose)
dev->driver->postclose(dev, priv);
drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
/* ========================================================
* End inline drm_release
*/
atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
spin_lock(&dev->count_lock);
if (!--dev->open_count) {
if (atomic_read(&dev->ioctl_count) || dev->blocked) {
DRM_ERROR("Device busy: %d %d\n",
atomic_read(&dev->ioctl_count), dev->blocked);
spin_unlock(&dev->count_lock);
unlock_kernel();
return -EBUSY;
}
spin_unlock(&dev->count_lock);
unlock_kernel();
return drm_lastclose(dev);
}
spin_unlock(&dev->count_lock);
unlock_kernel();
return retcode;
}
EXPORT_SYMBOL(drm_release);
/**
* Check whether DRI will run on this CPU.
*
* \return non-zero if the DRI will run on this CPU, or zero otherwise.
*/
static int drm_cpu_valid(void)
{
#if defined(__i386__)
if (boot_cpu_data.x86 == 3)
return 0; /* No cmpxchg on a 386 */
#endif
#if defined(__sparc__) && !defined(__sparc_v9__)
return 0; /* No cmpxchg before v9 sparc. */
#endif
return 1;
}
/**
* Called whenever a process opens /dev/drm.
*
* \param inode device inode.
* \param filp file pointer.
* \param dev device.
* \return zero on success or a negative number on failure.
*
* Creates and initializes a drm_file structure for the file private data in \p
* filp and add it into the double linked list in \p dev.
*/
static int drm_open_helper(struct inode *inode, struct file *filp,
drm_device_t * dev)
{
int minor = iminor(inode);
drm_file_t *priv;
int ret;
if (filp->f_flags & O_EXCL)
return -EBUSY; /* No exclusive opens */
if (!drm_cpu_valid())
return -EINVAL;
DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);
priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
if (!priv)
return -ENOMEM;
memset(priv, 0, sizeof(*priv));
filp->private_data = priv;
priv->uid = current->euid;
priv->pid = current->pid;
priv->minor = minor;
priv->head = drm_heads[minor];
priv->ioctl_count = 0;
priv->authenticated = capable(CAP_SYS_ADMIN);
priv->lock_count = 0;
if (dev->driver->open) {
ret = dev->driver->open(dev, priv);
if (ret < 0)
goto out_free;
}
down(&dev->struct_sem);
if (!dev->file_last) {
priv->next = NULL;
priv->prev = NULL;
dev->file_first = priv;
dev->file_last = priv;
} else {
priv->next = NULL;
priv->prev = dev->file_last;
dev->file_last->next = priv;
dev->file_last = priv;
}
up(&dev->struct_sem);
#ifdef __alpha__
/*
* Default the hose
*/
if (!dev->hose) {
struct pci_dev *pci_dev;
pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
if (pci_dev) {
dev->hose = pci_dev->sysdata;
pci_dev_put(pci_dev);
}
if (!dev->hose) {
struct pci_bus *b = pci_bus_b(pci_root_buses.next);
if (b)
dev->hose = b->sysdata;
}
}
#endif
return 0;
out_free:
drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
filp->private_data = NULL;
return ret;
}
/** No-op. */
int drm_fasync(int fd, struct file *filp, int on)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->dev;
int retcode;
DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
(long)old_encode_dev(priv->head->device));
retcode = fasync_helper(fd, filp, on, &dev->buf_async);
if (retcode < 0)
return retcode;
return 0;
}
EXPORT_SYMBOL(drm_fasync);
/** No-op. */
unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
{
return 0;
}
EXPORT_SYMBOL(drm_poll);
