/* r128_bufs.c -- IOCTLs to manage buffers -*- linux-c -*- * Created: Wed Apr 12 16:19:08 2000 by kevin@precisioninsight.com * * Copyright 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 * PRECISION INSIGHT 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. * * Authors: Kevin E. Martin * Rickard E. (Rik) Faith * Jeff Hartmann * */ #define __NO_VERSION__ #include #include "drmP.h" #include "r128_drv.h" #include "linux/un.h" #if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE) int r128_addbufs_agp(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->dev; drm_device_dma_t *dma = dev->dma; drm_buf_desc_t request; drm_buf_entry_t *entry; drm_buf_t *buf; unsigned long offset; unsigned long agp_offset; int count; int order; int size; int alignment; int page_order; int total; int byte_count; int i; if (!dma) return -EINVAL; if (copy_from_user(&request, (drm_buf_desc_t *)arg, sizeof(request))) return -EFAULT; count = request.count; order = drm_order(request.size); size = 1 << order; alignment = (request.flags & _DRM_PAGE_ALIGN) ? PAGE_ALIGN(size):size; page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; total = PAGE_SIZE << page_order; byte_count = 0; agp_offset = dev->agp->base + request.agp_start; DRM_DEBUG("count: %d\n", count); DRM_DEBUG("order: %d\n", order); DRM_DEBUG("size: %d\n", size); DRM_DEBUG("agp_offset: %ld\n", agp_offset); DRM_DEBUG("alignment: %d\n", alignment); DRM_DEBUG("page_order: %d\n", page_order); DRM_DEBUG("total: %d\n", total); if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) return -EINVAL; if (dev->queue_count) return -EBUSY; /* Not while in use */ spin_lock(&dev->count_lock); if (dev->buf_use) { spin_unlock(&dev->count_lock); return -EBUSY; } atomic_inc(&dev->buf_alloc); spin_unlock(&dev->count_lock); down(&dev->struct_sem); entry = &dma->bufs[order]; if (entry->buf_count) { up(&dev->struct_sem); atomic_dec(&dev->buf_alloc); return -ENOMEM; /* May only call once for each order */ } entry->buflist = drm_alloc(count * sizeof(*entry->buflist), DRM_MEM_BUFS); if (!entry->buflist) { up(&dev->struct_sem); atomic_dec(&dev->buf_alloc); return -ENOMEM; } memset(entry->buflist, 0, count * sizeof(*entry->buflist)); entry->buf_size = size; entry->page_order = page_order; offset = 0; for (offset = 0; entry->buf_count < count; offset += alignment, ++entry->buf_count) { buf = &entry->buflist[entry->buf_count]; buf->idx = dma->buf_count + entry->buf_count; buf->total = alignment; buf->order = order; buf->used = 0; buf->offset = (dma->byte_count + offset); buf->address = (void *)(agp_offset + offset); buf->next = NULL; buf->waiting = 0; buf->pending = 0; init_waitqueue_head(&buf->dma_wait); buf->pid = 0; buf->dev_priv_size = sizeof(drm_r128_buf_priv_t); buf->dev_private = drm_alloc(sizeof(drm_r128_buf_priv_t), DRM_MEM_BUFS); memset(buf->dev_private, 0, buf->dev_priv_size); #if DRM_DMA_HISTOGRAM buf->time_queued = 0; buf->time_dispatched = 0; buf->time_completed = 0; buf->time_freed = 0; #endif byte_count += PAGE_SIZE << page_order; DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address); } DRM_DEBUG("byte_count: %d\n", byte_count); dma->buflist = drm_realloc(dma->buflist, dma->buf_count * sizeof(*dma->buflist), (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist), DRM_MEM_BUFS); for (i = dma->buf_count; i < dma->buf_count + entry->buf_count; i++) dma->buflist[i] = &entry->buflist[i - dma->buf_count]; dma->buf_count += entry->buf_count; dma->byte_count += byte_count; drm_freelist_create(&entry->freelist, entry->buf_count); for (i = 0; i < entry->buf_count; i++) { drm_freelist_put(dev, &entry->freelist, &entry->buflist[i]); } up(&dev->struct_sem); request.count = entry->buf_count; request.size = size; if (copy_to_user((drm_buf_desc_t *)arg, &request, sizeof(request))) return -EFAULT; dma->flags = _DRM_DMA_USE_AGP; atomic_dec(&dev->buf_alloc); return 0; } #endif int r128_addbufs(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->dev; drm_r128_private_t *dev_priv = dev->dev_private; drm_buf_desc_t request; if (!dev_priv || dev_priv->is_pci) return -EINVAL; if (copy_from_user(&request, (drm_buf_desc_t *)arg, sizeof(request))) return -EFAULT; #if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE) if (request.flags & _DRM_AGP_BUFFER) return r128_addbufs_agp(inode, filp, cmd, arg); else #endif return -EINVAL; } int r128_mapbufs(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->dev; drm_r128_private_t *dev_priv = dev->dev_private; drm_device_dma_t *dma = dev->dma; int retcode = 0; const int zero = 0; unsigned long virtual; unsigned long address; drm_buf_map_t request; int i; if (!dma || !dev_priv || dev_priv->is_pci) return -EINVAL; DRM_DEBUG("\n"); spin_lock(&dev->count_lock); if (atomic_read(&dev->buf_alloc)) { spin_unlock(&dev->count_lock); return -EBUSY; } ++dev->buf_use; /* Can't allocate more after this call */ spin_unlock(&dev->count_lock); if (copy_from_user(&request, (drm_buf_map_t *)arg, sizeof(request))) return -EFAULT; if (request.count >= dma->buf_count) { if (dma->flags & _DRM_DMA_USE_AGP) { drm_map_t *map; map = dev_priv->agp_vertbufs; if (!map) { retcode = -EINVAL; goto done; } down(¤t->mm->mmap_sem); virtual = do_mmap(filp, 0, map->size, PROT_READ|PROT_WRITE, MAP_SHARED, (unsigned long)map->offset); up(¤t->mm->mmap_sem); } else { down(¤t->mm->mmap_sem); virtual = do_mmap(filp, 0, dma->byte_count, PROT_READ|PROT_WRITE, MAP_SHARED, 0); up(¤t->mm->mmap_sem); } if (virtual > -1024UL) { /* Real error */ retcode = (signed long)virtual; goto done; } request.virtual = (void *)virtual; for (i = 0; i < dma->buf_count; i++) { if (copy_to_user(&request.list[i].idx, &dma->buflist[i]->idx, sizeof(request.list[0].idx))) { retcode = -EFAULT; goto done; } if (copy_to_user(&request.list[i].total, &dma->buflist[i]->total, sizeof(request.list[0].total))) { retcode = -EFAULT; goto done; } if (copy_to_user(&request.list[i].used, &zero, sizeof(zero))) { retcode = -EFAULT; goto done; } address = virtual + dma->buflist[i]->offset; if (copy_to_user(&request.list[i].address, &address, sizeof(address))) { retcode = -EFAULT; goto done; } } } done: request.count = dma->buf_count; DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode); if (copy_to_user((drm_buf_map_t *)arg, &request, sizeof(request))) return -EFAULT; return retcode; } '#n176'>176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 
/**
 * \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,
			   drm_device_t * dev);

static int drm_setup(drm_device_t * 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->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 = 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);
	}
	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)
{
	drm_device_t *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,
			   drm_device_t * dev)
{
	int minor = iminor(inode);
	drm_file_t *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->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->user_objects);
	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 (!dev->file_last) {
		priv->next = NULL;
		priv->prev = NULL;
		dev->file_first = priv;
		dev->file_last = priv;
		/* first opener automatically becomes master */
		priv->master = 1;
	} else {
		priv->next = NULL;
		priv->prev = dev->file_last;
		dev->file_last->next = priv;
		dev->file_last = priv;
	}
	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)
{
	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);

static void drm_object_release(struct file *filp) {

        drm_file_t *priv = filp->private_data;
	struct list_head *head;
	drm_user_object_t *user_object;
	drm_ref_object_t *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, drm_ref_object_t, list);
		drm_remove_ref_object(priv, ref_object);		
		head = &priv->refd_objects; 
	}
		
	/*
	 * Free leftover user objects created by me.
	 */

	head = &priv->user_objects; 
	while (head->next != head) {
		user_object = list_entry(head->next, drm_user_object_t, list);
		drm_remove_user_object(priv, user_object);		
		head = &priv->user_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 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 (dev->driver->reclaim_buffers_locked && dev->lock.hw_lock) {
	        unsigned long _end = jiffies + DRM_HZ*3;

		do {
			retcode = drm_kernel_take_hw_lock(filp);
		} while(retcode && !time_after_eq(jiffies,_end));

		if (!retcode) {
			dev->driver->reclaim_buffers_locked(dev, filp);

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

			/*
			 * FIXME: This is not a good solution. We should perhaps associate the
			 * DRM lock with a process context, and check whether the current process
			 * holds the lock. Then we can run reclaim buffers locked anyway.
			 */

			DRM_ERROR("Reclaim buffers locked deadlock.\n"
				  "\tThis is probably a single thread having multiple\n"
				  "\tDRM file descriptors open either dying or"
				  " closing file descriptors\n"
				  "\twhile having the lock. I will not reclaim buffers.\n"
				  "\tLocking context is 0x%08x\n",
				  _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
		}
	} else if (drm_i_have_hw_lock(filp)) {
		DRM_DEBUG("File %p released, freeing lock for context %d\n",
			  filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));

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

	drm_fasync(-1, filp, 0);

	mutex_lock(&dev->ctxlist_mutex);

	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;
			}
		}
	}
	mutex_unlock(&dev->ctxlist_mutex);

	mutex_lock(&dev->struct_mutex);
	drm_object_release(filp);
	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;
	}
	mutex_unlock(&dev->struct_mutex);

	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);

/** 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. 
 */
unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
{
	/* return (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM); */
	return 0;
}
EXPORT_SYMBOL(drm_poll);
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-23 13:50:06 +0000