/** * \file drm_irq.c * IRQ support * * \author Rickard E. (Rik) Faith * \author Gareth Hughes */ /* * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com * * Copyright 1999, 2000 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 /* For task queue support */ /** * Get interrupt from bus id. * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg user argument, pointing to a drm_irq_busid structure. * \return zero on success or a negative number on failure. * * Finds the PCI device with the specified bus id and gets its IRQ number. * This IOCTL is deprecated, and will now return EINVAL for any busid not equal * to that of the device that this DRM instance attached to. */ int drm_irq_by_busid(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_irq_busid *p = data; if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) return -EINVAL; if ((p->busnum >> 8) != drm_get_pci_domain(dev) || (p->busnum & 0xff) != dev->pdev->bus->number || p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) return -EINVAL; p->irq = dev->irq; DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, p->irq); return 0; } /** * Install IRQ handler. * * \param dev DRM device. * * Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions * before and after the installation. */ int drm_irq_install(struct drm_device * dev) { int ret; unsigned long sh_flags = 0; if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) return -EINVAL; if (dev->irq == 0) return -EINVAL; mutex_lock(&dev->struct_mutex); /* Driver must have been initialized */ if (!dev->dev_private) { mutex_unlock(&dev->struct_mutex); return -EINVAL; } if (dev->irq_enabled) { mutex_unlock(&dev->struct_mutex); return -EBUSY; } dev->irq_enabled = 1; mutex_unlock(&dev->struct_mutex); DRM_DEBUG("%s: irq=%d\n", __FUNCTION__, dev->irq); if (drm_core_check_feature(dev, DRIVER_IRQ_VBL)) { init_waitqueue_head(&dev->vbl_queue); spin_lock_init(&dev->vbl_lock); INIT_LIST_HEAD(&dev->vbl_sigs); INIT_LIST_HEAD(&dev->vbl_sigs2); dev->vbl_pending = 0; } /* Before installing handler */ dev->driver->irq_preinstall(dev); /* Install handler */ if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) sh_flags = IRQF_SHARED; ret = request_irq(dev->irq, dev->driver->irq_handler, sh_flags, dev->devname, dev); if (ret < 0) { mutex_lock(&dev->struct_mutex); dev->irq_enabled = 0; mutex_unlock(&dev->struct_mutex); return ret; } /* After installing handler */ dev->driver->irq_postinstall(dev); return 0; } EXPORT_SYMBOL(drm_irq_install); /** * Uninstall the IRQ handler. * * \param dev DRM device. * * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq. */ int drm_irq_uninstall(struct drm_device * dev) { int irq_enabled; if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) return -EINVAL; mutex_lock(&dev->struct_mutex); irq_enabled = dev->irq_enabled; dev->irq_enabled = 0; mutex_unlock(&dev->struct_mutex); if (!irq_enabled) return -EINVAL; DRM_DEBUG("%s: irq=%d\n", __FUNCTION__, dev->irq); dev->driver->irq_uninstall(dev); free_irq(dev->irq, dev); dev->locked_tasklet_func = NULL; return 0; } EXPORT_SYMBOL(drm_irq_uninstall); /** * IRQ control ioctl. * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg user argument, pointing to a drm_control structure. * \return zero on success or a negative number on failure. * * Calls irq_install() or irq_uninstall() according to \p arg. */ int drm_control(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_control *ctl = data; /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */ switch (ctl->func) { case DRM_INST_HANDLER: if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) return 0; if (dev->if_version < DRM_IF_VERSION(1, 2) && ctl->irq != dev->irq) return -EINVAL; return drm_irq_install(dev); case DRM_UNINST_HANDLER: if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) return 0; return drm_irq_uninstall(dev); default: return -EINVAL; } } /** * Wait for VBLANK. * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param data user argument, pointing to a drm_wait_vblank structure. * \return zero on success or a negative number on failure. * * Verifies the IRQ is installed. * * If a signal is requested checks if this task has already scheduled the same signal * for the same vblank sequence number - nothing to be done in * that case. If the number of tasks waiting for the interrupt exceeds 100 the * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this * task. * * If a signal is not requested, then calls vblank_wait(). */ int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_priv) { union drm_wait_vblank *vblwait = data; struct timeval now; int ret = 0; unsigned int flags, seq; if ((!dev->irq) || (!dev->irq_enabled)) return -EINVAL; if (vblwait->request.type & ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) { DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", vblwait->request.type, (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)); return -EINVAL; } flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; if (!drm_core_check_feature(dev, (flags & _DRM_VBLANK_SECONDARY) ? DRIVER_IRQ_VBL2 : DRIVER_IRQ_VBL)) return -EINVAL; seq = atomic_read((flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_received2 : &dev->vbl_received); switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { case _DRM_VBLANK_RELATIVE: vblwait->request.sequence += seq; vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; case _DRM_VBLANK_ABSOLUTE: break; default: return -EINVAL; } if ((flags & _DRM_VBLANK_NEXTONMISS) && (seq - vblwait->request.sequence) <= (1<<23)) { vblwait->request.sequence = seq + 1; } if (flags & _DRM_VBLANK_SIGNAL) { unsigned long irqflags; struct list_head *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_sigs2 : &dev->vbl_sigs; struct drm_vbl_sig *vbl_sig; spin_lock_irqsave(&dev->vbl_lock, irqflags); /* Check if this task has already scheduled the same signal * for the same vblank sequence number; nothing to be done in * that case */ list_for_each_entry(vbl_sig, vbl_sigs, head) { if (vbl_sig->sequence == vblwait->request.sequence && vbl_sig->info.si_signo == vblwait->request.signal && vbl_sig->task == current) { spin_unlock_irqrestore(&dev->vbl_lock, irqflags); vblwait->reply.sequence = seq; goto done; } } if (dev->vbl_pending >= 100) { spin_unlock_irqrestore(&dev->vbl_lock, irqflags); return -EBUSY; } dev->vbl_pending++; spin_unlock_irqrestore(&dev->vbl_lock, irqflags); if (! (vbl_sig = drm_alloc(sizeof(struct drm_vbl_sig), DRM_MEM_DRIVER))) { return -ENOMEM; } memset((void *)vbl_sig, 0, sizeof(*vbl_sig)); vbl_sig->sequence = vblwait->request.sequence; vbl_sig->info.si_signo = vblwait->request.signal; vbl_sig->task = current; spin_lock_irqsave(&dev->vbl_lock, irqflags); list_add_tail(&vbl_sig->head, vbl_sigs); spin_unlock_irqrestore(&dev->vbl_lock, irqflags); vblwait->reply.sequence = seq; } else { if (flags & _DRM_VBLANK_SECONDARY) { if (dev->driver->vblank_wait2) ret = dev->driver->vblank_wait2(dev, &vblwait->request.sequence); } else if (dev->driver->vblank_wait) ret = dev->driver->vblank_wait(dev, &vblwait->request.sequence); do_gettimeofday(&now); vblwait->reply.tval_sec = now.tv_sec; vblwait->reply.tval_usec = now.tv_usec; } done: return ret; } /** * Send the VBLANK signals. * * \param dev DRM device. * * Sends a signal for each task in drm_device::vbl_sigs and empties the list. * * If a signal is not requested, then calls vblank_wait(). */ void drm_vbl_send_signals(struct drm_device * dev) { unsigned long flags; int i; spin_lock_irqsave(&dev->vbl_lock, flags); for (i = 0; i < 2; i++) { struct drm_vbl_sig *vbl_sig, *tmp; struct list_head *vbl_sigs = i ? &dev->vbl_sigs2 : &dev->vbl_sigs; unsigned int vbl_seq = atomic_read(i ? &dev->vbl_received2 : &dev->vbl_received); list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) { if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) { vbl_sig->info.si_code = vbl_seq; send_sig_info(vbl_sig->info.si_signo, &vbl_sig->info, vbl_sig->task); list_del(&vbl_sig->head); drm_free(vbl_sig, sizeof(*vbl_sig), DRM_MEM_DRIVER); dev->vbl_pending--; } } } spin_unlock_irqrestore(&dev->vbl_lock, flags); } EXPORT_SYMBOL(drm_vbl_send_signals); /** * Tasklet wrapper function. * * \param data DRM device in disguise. * * Attempts to grab the HW lock and calls the driver callback on success. On * failure, leave the lock marked as contended so the callback can be called * from drm_unlock(). */ static void drm_locked_tasklet_func(unsigned long data) { struct drm_device *dev = (struct drm_device*)data; unsigned long irqflags; spin_lock_irqsave(&dev->tasklet_lock, irqflags); if (!dev->locked_tasklet_func || !drm_lock_take(&dev->lock, DRM_KERNEL_CONTEXT)) { spin_unlock_irqrestore(&dev->tasklet_lock, irqflags); return; } dev->lock.lock_time = jiffies; atomic_inc(&dev->counts[_DRM_STAT_LOCKS]); dev->locked_tasklet_func(dev); drm_lock_free(&dev->lock, DRM_KERNEL_CONTEXT); dev->locked_tasklet_func = NULL; spin_unlock_irqrestore(&dev->tasklet_lock, irqflags); } /** * Schedule a tasklet to call back a driver hook with the HW lock held. * * \param dev DRM device. * \param func Driver callback. * * This is intended for triggering actions that require the HW lock from an * interrupt handler. The lock will be grabbed ASAP after the interrupt handler * completes. Note that the callback may be called from interrupt or process * context, it must not make any assumptions about this. Also, the HW lock will * be held with the kernel context or any client context. */ void drm_locked_tasklet(struct drm_device *dev, void (*func)(struct drm_device*)) { unsigned long irqflags; static DECLARE_TASKLET(drm_tasklet, drm_locked_tasklet_func, 0); if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ) || test_bit(TASKLET_STATE_SCHED, &drm_tasklet.state)) return; spin_lock_irqsave(&dev->tasklet_lock, irqflags); if (dev->locked_tasklet_func) { spin_unlock_irqrestore(&dev->tasklet_lock, irqflags); return; } dev->locked_tasklet_func = func; spin_unlock_irqrestore(&dev->tasklet_lock, irqflags); drm_tasklet.data = (unsigned long)dev; tasklet_hi_schedule(&drm_tasklet); } EXPORT_SYMBOL(drm_locked_tasklet); a> 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 
/**
 * \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 "drm_sarea.h"
#include <linux/poll.h>

static int drm_open_helper(struct inode *inode, struct file *filp,
			   struct drm_device * dev);

static int drm_setup(struct drm_device * dev)
{
	drm_local_map_t *map;
	int i;
	int ret;
	int sareapage;

	if (dev->driver->firstopen) {
		ret = dev->driver->firstopen(dev);
		if (ret != 0)
			return ret;
	}

	dev->magicfree.next = NULL;

	/* prebuild the SAREA */
	sareapage = max(SAREA_MAX, PAGE_SIZE);
	i = drm_addmap(dev, 0, sareapage, _DRM_SHM, _DRM_CONTAINS_LOCK, &map);
	if (i != 0)
		return i;

	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 < ARRAY_SIZE(dev->counts); i++)
		atomic_set(&dev->counts[i], 0);

	drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER);
	INIT_LIST_HEAD(&dev->magicfree);

	dev->sigdata.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)
{
	struct drm_device *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);
			retcode = drm_setup(dev);
			goto out;
		}
		spin_unlock(&dev->count_lock);
	}

 out:
	mutex_lock(&dev->struct_mutex);
	BUG_ON((dev->dev_mapping != NULL) &&
	       (dev->dev_mapping != inode->i_mapping));
	if (dev->dev_mapping == NULL)
		dev->dev_mapping = inode->i_mapping;
	mutex_unlock(&dev->struct_mutex);

	return retcode;
}
EXPORT_SYMBOL(drm_open);

/**
 * File \c open operation.
 *
 * \param inode device inode.
 * \param filp file pointer.
 *
 * Puts the dev->fops corresponding to the device minor number into
 * \p filp, call the \c open method, and restore the file operations.
 */
int drm_stub_open(struct inode *inode, struct file *filp)
{
	struct drm_device *dev = NULL;
	int minor = iminor(inode);
	int err = -ENODEV;
	const struct file_operations *old_fops;

	DRM_DEBUG("\n");

	if (!((minor >= 0) && (minor < drm_cards_limit)))
		return -ENODEV;

	if (!drm_heads[minor])
		return -ENODEV;

	if (!(dev = drm_heads[minor]->dev))
		return -ENODEV;

	old_fops = filp->f_op;
	filp->f_op = fops_get(&dev->driver->fops);
	if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
		fops_put(filp->f_op);
		filp->f_op = fops_get(old_fops);
	}
	fops_put(old_fops);

	return err;
}

/**
 * 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,
			   struct drm_device * dev)
{
	int minor = iminor(inode);
	struct drm_file *priv;
	int ret;
	int i,j;

	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->filp = filp;
	priv->uid = current->euid;
	priv->pid = current->pid;
	priv->minor = minor;
	priv->head = drm_heads[minor];
	priv->ioctl_count = 0;
	/* 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->refd_objects);

	for (i=0; i<_DRM_NO_REF_TYPES; ++i) {
		ret = drm_ht_create(&priv->refd_object_hash[i], DRM_FILE_HASH_ORDER);
		if (ret)
			break;
	}

	if (ret) {
		for(j = 0; j < i; ++j)
			drm_ht_remove(&priv->refd_object_hash[j]);
		goto out_free;
	}

	if (dev->driver->open) {
		ret = dev->driver->open(dev, priv);
		if (ret < 0)
			goto out_free;
	}

	mutex_lock(&dev->struct_mutex);
	if (list_empty(&dev->filelist))
		priv->master = 1;

	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 = 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)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *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);

static void drm_object_release(struct file *filp)
{
	struct drm_file *priv = filp->private_data;
	struct list_head *head;
	struct drm_ref_object *ref_object;
	int i;

	/*
	 * Free leftover ref objects created by me. Note that we cannot use
	 * list_for_each() here, as the struct_mutex may be temporarily released
	 * by the remove_() functions, and thus the lists may be altered.
	 * Also, a drm_remove_ref_object() will not remove it
	 * from the list unless its refcount is 1.
	 */

	head = &priv->refd_objects;
	while (head->next != head) {
		ref_object = list_entry(head->next, struct drm_ref_object, list);
		drm_remove_ref_object(priv, ref_object);
		head = &priv->refd_objects;
	}

	for(i = 0; i < _DRM_NO_REF_TYPES; ++i) {
		drm_ht_remove(&priv->refd_object_hash[i]);
	}
}

/**
 * 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_device *dev = file_priv->head->dev;
	int retcode = 0;

	lock_kernel();

	DRM_DEBUG("open_count = %d\n", dev->open_count);

	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",
		  current->pid, (long)old_encode_dev(file_priv->head->device),
		  dev->open_count);

	if (dev->driver->reclaim_buffers_locked && dev->lock.hw_lock) {
		if (drm_i_have_hw_lock(dev, file_priv)) {
			dev->driver->reclaim_buffers_locked(dev, file_priv);
		} else {
			unsigned long _end=jiffies + 3*DRM_HZ;
			int locked = 0;

			drm_idlelock_take(&dev->lock);

			/*
			 * Wait for a while.
			 */

			do{
				spin_lock(&dev->lock.spinlock);
				locked = dev->lock.idle_has_lock;
				spin_unlock(&dev->lock.spinlock);
				if (locked)
					break;
				schedule();
			} while (!time_after_eq(jiffies, _end));

			if (!locked) {
				DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n"
					  "\tdriver to use reclaim_buffers_idlelocked() instead.\n"
					  "\tI will go on reclaiming the buffers anyway.\n");
			}

			dev->driver->reclaim_buffers_locked(dev, file_priv);
			drm_idlelock_release(&dev->lock);
		}
	}

	if (dev->driver->reclaim_buffers_idlelocked && dev->lock.hw_lock) {

		drm_idlelock_take(&dev->lock);
		dev->driver->reclaim_buffers_idlelocked(dev, file_priv);
		drm_idlelock_release(&dev->lock);

	}

	if (drm_i_have_hw_lock(dev, file_priv)) {
		DRM_DEBUG("File %p released, freeing lock for context %d\n",
			  filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));

		drm_lock_free(&dev->lock,
			      _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
	}


	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
	    !dev->driver->reclaim_buffers_locked) {
		dev->driver->reclaim_buffers(dev, file_priv);
	}

	drm_fasync(-1, filp, 0);

	mutex_lock(&dev->ctxlist_mutex);

	if (!list_empty(&dev->ctxlist)) {
		struct drm_ctx_list *pos, *n;

		list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
			if (pos->tag == file_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;
			}
		}
	}
	mutex_unlock(&dev->ctxlist_mutex);

	mutex_lock(&dev->struct_mutex);
	drm_object_release(filp);
	if (file_priv->remove_auth_on_close == 1) {
		struct drm_file *temp;

		list_for_each_entry(temp, &dev->filelist, lhead)
			temp->authenticated = 0;
	}
	list_del(&file_priv->lhead);
	mutex_unlock(&dev->struct_mutex);

	if (dev->driver->postclose)
		dev->driver->postclose(dev, file_priv);
	drm_free(file_priv, sizeof(*file_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);

/** No-op. */
/* This is to deal with older X servers that believe 0 means data is
 * available which is not the correct return for a poll function.
 * This cannot be fixed until the Xserver is fixed. Xserver will need
 * to set a newer interface version to avoid breaking older Xservers.
 * Without fixing the Xserver you get: "WaitForSomething(): select: errno=22"
 * http://freedesktop.org/bugzilla/show_bug.cgi?id=1505 if you try
 * to return the correct response.
 */