1/*
   2 * \author Rickard E. (Rik) Faith <faith@valinux.com>
   3 * \author Daryll Strauss <daryll@valinux.com>
   4 * \author Gareth Hughes <gareth@valinux.com>
   5 */
   6
   7/*
   8 * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
   9 *
  10 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  12 * All Rights Reserved.
  13 *
  14 * Permission is hereby granted, free of charge, to any person obtaining a
  15 * copy of this software and associated documentation files (the "Software"),
  16 * to deal in the Software without restriction, including without limitation
  17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  18 * and/or sell copies of the Software, and to permit persons to whom the
  19 * Software is furnished to do so, subject to the following conditions:
  20 *
  21 * The above copyright notice and this permission notice (including the next
  22 * paragraph) shall be included in all copies or substantial portions of the
  23 * Software.
  24 *
  25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  28 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  31 * OTHER DEALINGS IN THE SOFTWARE.
  32 */
  33
  34#include <linux/anon_inodes.h>
  35#include <linux/dma-fence.h>
  36#include <linux/file.h>
  37#include <linux/module.h>
  38#include <linux/pci.h>
  39#include <linux/poll.h>
  40#include <linux/slab.h>
  41#include <linux/vga_switcheroo.h>
  42
  43#include <drm/drm_client_event.h>
  44#include <drm/drm_drv.h>
  45#include <drm/drm_file.h>
  46#include <drm/drm_gem.h>
  47#include <drm/drm_print.h>
  48
  49#include "drm_crtc_internal.h"
  50#include "drm_internal.h"
  51
  52/* from BKL pushdown */
  53DEFINE_MUTEX(drm_global_mutex);
  54
  55bool drm_dev_needs_global_mutex(struct drm_device *dev)
  56{
  57	/*
  58	 * The deprecated ->load callback must be called after the driver is
  59	 * already registered. This means such drivers rely on the BKL to make
  60	 * sure an open can't proceed until the driver is actually fully set up.
  61	 * Similar hilarity holds for the unload callback.
  62	 */
  63	if (dev->driver->load || dev->driver->unload)
  64		return true;
  65
 
 
 
 
 
 
 
 
 
  66	return false;
  67}
  68
  69/**
  70 * DOC: file operations
  71 *
  72 * Drivers must define the file operations structure that forms the DRM
  73 * userspace API entry point, even though most of those operations are
  74 * implemented in the DRM core. The resulting &struct file_operations must be
  75 * stored in the &drm_driver.fops field. The mandatory functions are drm_open(),
  76 * drm_read(), drm_ioctl() and drm_compat_ioctl() if CONFIG_COMPAT is enabled
  77 * Note that drm_compat_ioctl will be NULL if CONFIG_COMPAT=n, so there's no
  78 * need to sprinkle #ifdef into the code. Drivers which implement private ioctls
  79 * that require 32/64 bit compatibility support must provide their own
  80 * &file_operations.compat_ioctl handler that processes private ioctls and calls
  81 * drm_compat_ioctl() for core ioctls.
  82 *
  83 * In addition drm_read() and drm_poll() provide support for DRM events. DRM
  84 * events are a generic and extensible means to send asynchronous events to
  85 * userspace through the file descriptor. They are used to send vblank event and
  86 * page flip completions by the KMS API. But drivers can also use it for their
  87 * own needs, e.g. to signal completion of rendering.
  88 *
  89 * For the driver-side event interface see drm_event_reserve_init() and
  90 * drm_send_event() as the main starting points.
  91 *
  92 * The memory mapping implementation will vary depending on how the driver
  93 * manages memory. For GEM-based drivers this is drm_gem_mmap().
  94 *
  95 * No other file operations are supported by the DRM userspace API. Overall the
  96 * following is an example &file_operations structure::
  97 *
  98 *     static const example_drm_fops = {
  99 *             .owner = THIS_MODULE,
 100 *             .open = drm_open,
 101 *             .release = drm_release,
 102 *             .unlocked_ioctl = drm_ioctl,
 103 *             .compat_ioctl = drm_compat_ioctl, // NULL if CONFIG_COMPAT=n
 104 *             .poll = drm_poll,
 105 *             .read = drm_read,
 
 106 *             .mmap = drm_gem_mmap,
 107 *     };
 108 *
 109 * For plain GEM based drivers there is the DEFINE_DRM_GEM_FOPS() macro, and for
 110 * DMA based drivers there is the DEFINE_DRM_GEM_DMA_FOPS() macro to make this
 111 * simpler.
 112 *
 113 * The driver's &file_operations must be stored in &drm_driver.fops.
 114 *
 115 * For driver-private IOCTL handling see the more detailed discussion in
 116 * :ref:`IOCTL support in the userland interfaces chapter<drm_driver_ioctl>`.
 117 */
 118
 119/**
 120 * drm_file_alloc - allocate file context
 121 * @minor: minor to allocate on
 122 *
 123 * This allocates a new DRM file context. It is not linked into any context and
 124 * can be used by the caller freely. Note that the context keeps a pointer to
 125 * @minor, so it must be freed before @minor is.
 126 *
 127 * RETURNS:
 128 * Pointer to newly allocated context, ERR_PTR on failure.
 129 */
 130struct drm_file *drm_file_alloc(struct drm_minor *minor)
 131{
 132	static atomic64_t ident = ATOMIC64_INIT(0);
 133	struct drm_device *dev = minor->dev;
 134	struct drm_file *file;
 135	int ret;
 136
 137	file = kzalloc(sizeof(*file), GFP_KERNEL);
 138	if (!file)
 139		return ERR_PTR(-ENOMEM);
 140
 141	/* Get a unique identifier for fdinfo: */
 142	file->client_id = atomic64_inc_return(&ident);
 143	rcu_assign_pointer(file->pid, get_pid(task_tgid(current)));
 144	file->minor = minor;
 145
 146	/* for compatibility root is always authenticated */
 147	file->authenticated = capable(CAP_SYS_ADMIN);
 148
 149	INIT_LIST_HEAD(&file->lhead);
 150	INIT_LIST_HEAD(&file->fbs);
 151	mutex_init(&file->fbs_lock);
 152	INIT_LIST_HEAD(&file->blobs);
 153	INIT_LIST_HEAD(&file->pending_event_list);
 154	INIT_LIST_HEAD(&file->event_list);
 155	init_waitqueue_head(&file->event_wait);
 156	file->event_space = 4096; /* set aside 4k for event buffer */
 157
 158	spin_lock_init(&file->master_lookup_lock);
 159	mutex_init(&file->event_read_lock);
 160	mutex_init(&file->client_name_lock);
 161
 162	if (drm_core_check_feature(dev, DRIVER_GEM))
 163		drm_gem_open(dev, file);
 164
 165	if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 166		drm_syncobj_open(file);
 167
 168	drm_prime_init_file_private(&file->prime);
 169
 170	if (dev->driver->open) {
 171		ret = dev->driver->open(dev, file);
 172		if (ret < 0)
 173			goto out_prime_destroy;
 174	}
 175
 176	return file;
 177
 178out_prime_destroy:
 179	drm_prime_destroy_file_private(&file->prime);
 180	if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 181		drm_syncobj_release(file);
 182	if (drm_core_check_feature(dev, DRIVER_GEM))
 183		drm_gem_release(dev, file);
 184	put_pid(rcu_access_pointer(file->pid));
 185	kfree(file);
 186
 187	return ERR_PTR(ret);
 188}
 189
 190static void drm_events_release(struct drm_file *file_priv)
 191{
 192	struct drm_device *dev = file_priv->minor->dev;
 193	struct drm_pending_event *e, *et;
 194	unsigned long flags;
 195
 196	spin_lock_irqsave(&dev->event_lock, flags);
 197
 198	/* Unlink pending events */
 199	list_for_each_entry_safe(e, et, &file_priv->pending_event_list,
 200				 pending_link) {
 201		list_del(&e->pending_link);
 202		e->file_priv = NULL;
 203	}
 204
 205	/* Remove unconsumed events */
 206	list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
 207		list_del(&e->link);
 208		kfree(e);
 209	}
 210
 211	spin_unlock_irqrestore(&dev->event_lock, flags);
 212}
 213
 214/**
 215 * drm_file_free - free file context
 216 * @file: context to free, or NULL
 217 *
 218 * This destroys and deallocates a DRM file context previously allocated via
 219 * drm_file_alloc(). The caller must make sure to unlink it from any contexts
 220 * before calling this.
 221 *
 222 * If NULL is passed, this is a no-op.
 223 */
 224void drm_file_free(struct drm_file *file)
 225{
 226	struct drm_device *dev;
 227
 228	if (!file)
 229		return;
 230
 231	dev = file->minor->dev;
 232
 233	drm_dbg_core(dev, "comm=\"%s\", pid=%d, dev=0x%lx, open_count=%d\n",
 234		     current->comm, task_pid_nr(current),
 235		     (long)old_encode_dev(file->minor->kdev->devt),
 236		     atomic_read(&dev->open_count));
 237
 238	drm_events_release(file);
 239
 240	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 241		drm_fb_release(file);
 242		drm_property_destroy_user_blobs(dev, file);
 243	}
 244
 245	if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 246		drm_syncobj_release(file);
 247
 248	if (drm_core_check_feature(dev, DRIVER_GEM))
 249		drm_gem_release(dev, file);
 250
 251	if (drm_is_primary_client(file))
 252		drm_master_release(file);
 253
 254	if (dev->driver->postclose)
 255		dev->driver->postclose(dev, file);
 256
 257	drm_prime_destroy_file_private(&file->prime);
 258
 259	WARN_ON(!list_empty(&file->event_list));
 260
 261	put_pid(rcu_access_pointer(file->pid));
 262
 263	mutex_destroy(&file->client_name_lock);
 264	kfree(file->client_name);
 265
 266	kfree(file);
 267}
 268
 269static void drm_close_helper(struct file *filp)
 270{
 271	struct drm_file *file_priv = filp->private_data;
 272	struct drm_device *dev = file_priv->minor->dev;
 273
 274	mutex_lock(&dev->filelist_mutex);
 275	list_del(&file_priv->lhead);
 276	mutex_unlock(&dev->filelist_mutex);
 277
 278	drm_file_free(file_priv);
 279}
 280
 281/*
 282 * Check whether DRI will run on this CPU.
 283 *
 284 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
 285 */
 286static int drm_cpu_valid(void)
 287{
 288#if defined(__sparc__) && !defined(__sparc_v9__)
 289	return 0;		/* No cmpxchg before v9 sparc. */
 290#endif
 291	return 1;
 292}
 293
 294/*
 295 * Called whenever a process opens a drm node
 296 *
 297 * \param filp file pointer.
 298 * \param minor acquired minor-object.
 299 * \return zero on success or a negative number on failure.
 300 *
 301 * Creates and initializes a drm_file structure for the file private data in \p
 302 * filp and add it into the double linked list in \p dev.
 303 */
 304int drm_open_helper(struct file *filp, struct drm_minor *minor)
 305{
 306	struct drm_device *dev = minor->dev;
 307	struct drm_file *priv;
 308	int ret;
 309
 310	if (filp->f_flags & O_EXCL)
 311		return -EBUSY;	/* No exclusive opens */
 312	if (!drm_cpu_valid())
 313		return -EINVAL;
 314	if (dev->switch_power_state != DRM_SWITCH_POWER_ON &&
 315	    dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
 316		return -EINVAL;
 317	if (WARN_ON_ONCE(!(filp->f_op->fop_flags & FOP_UNSIGNED_OFFSET)))
 318		return -EINVAL;
 319
 320	drm_dbg_core(dev, "comm=\"%s\", pid=%d, minor=%d\n",
 321		     current->comm, task_pid_nr(current), minor->index);
 322
 323	priv = drm_file_alloc(minor);
 324	if (IS_ERR(priv))
 325		return PTR_ERR(priv);
 326
 327	if (drm_is_primary_client(priv)) {
 328		ret = drm_master_open(priv);
 329		if (ret) {
 330			drm_file_free(priv);
 331			return ret;
 332		}
 333	}
 334
 335	filp->private_data = priv;
 
 336	priv->filp = filp;
 337
 338	mutex_lock(&dev->filelist_mutex);
 339	list_add(&priv->lhead, &dev->filelist);
 340	mutex_unlock(&dev->filelist_mutex);
 341
 342	return 0;
 343}
 344
 345/**
 346 * drm_open - open method for DRM file
 347 * @inode: device inode
 348 * @filp: file pointer.
 349 *
 350 * This function must be used by drivers as their &file_operations.open method.
 351 * It looks up the correct DRM device and instantiates all the per-file
 352 * resources for it. It also calls the &drm_driver.open driver callback.
 353 *
 354 * RETURNS:
 
 355 * 0 on success or negative errno value on failure.
 356 */
 357int drm_open(struct inode *inode, struct file *filp)
 358{
 359	struct drm_device *dev;
 360	struct drm_minor *minor;
 361	int retcode;
 362
 363	minor = drm_minor_acquire(&drm_minors_xa, iminor(inode));
 364	if (IS_ERR(minor))
 365		return PTR_ERR(minor);
 366
 367	dev = minor->dev;
 368	if (drm_dev_needs_global_mutex(dev))
 369		mutex_lock(&drm_global_mutex);
 370
 371	atomic_fetch_inc(&dev->open_count);
 372
 373	/* share address_space across all char-devs of a single device */
 374	filp->f_mapping = dev->anon_inode->i_mapping;
 375
 376	retcode = drm_open_helper(filp, minor);
 377	if (retcode)
 378		goto err_undo;
 379
 380	if (drm_dev_needs_global_mutex(dev))
 381		mutex_unlock(&drm_global_mutex);
 382
 383	return 0;
 384
 385err_undo:
 386	atomic_dec(&dev->open_count);
 387	if (drm_dev_needs_global_mutex(dev))
 388		mutex_unlock(&drm_global_mutex);
 389	drm_minor_release(minor);
 390	return retcode;
 391}
 392EXPORT_SYMBOL(drm_open);
 393
 394static void drm_lastclose(struct drm_device *dev)
 395{
 396	drm_client_dev_restore(dev);
 
 
 
 
 397
 398	if (dev_is_pci(dev->dev))
 399		vga_switcheroo_process_delayed_switch();
 400}
 401
 402/**
 403 * drm_release - release method for DRM file
 404 * @inode: device inode
 405 * @filp: file pointer.
 406 *
 407 * This function must be used by drivers as their &file_operations.release
 408 * method. It frees any resources associated with the open file. If this
 409 * is the last open file for the DRM device, it also restores the active
 410 * in-kernel DRM client.
 411 *
 412 * RETURNS:
 
 413 * Always succeeds and returns 0.
 414 */
 415int drm_release(struct inode *inode, struct file *filp)
 416{
 417	struct drm_file *file_priv = filp->private_data;
 418	struct drm_minor *minor = file_priv->minor;
 419	struct drm_device *dev = minor->dev;
 420
 421	if (drm_dev_needs_global_mutex(dev))
 422		mutex_lock(&drm_global_mutex);
 423
 424	drm_dbg_core(dev, "open_count = %d\n", atomic_read(&dev->open_count));
 425
 426	drm_close_helper(filp);
 427
 428	if (atomic_dec_and_test(&dev->open_count))
 429		drm_lastclose(dev);
 430
 431	if (drm_dev_needs_global_mutex(dev))
 432		mutex_unlock(&drm_global_mutex);
 433
 434	drm_minor_release(minor);
 435
 436	return 0;
 437}
 438EXPORT_SYMBOL(drm_release);
 439
 440void drm_file_update_pid(struct drm_file *filp)
 441{
 442	struct drm_device *dev;
 443	struct pid *pid, *old;
 444
 445	/*
 446	 * Master nodes need to keep the original ownership in order for
 447	 * drm_master_check_perm to keep working correctly. (See comment in
 448	 * drm_auth.c.)
 449	 */
 450	if (filp->was_master)
 451		return;
 452
 453	pid = task_tgid(current);
 454
 455	/*
 456	 * Quick unlocked check since the model is a single handover followed by
 457	 * exclusive repeated use.
 458	 */
 459	if (pid == rcu_access_pointer(filp->pid))
 460		return;
 461
 462	dev = filp->minor->dev;
 463	mutex_lock(&dev->filelist_mutex);
 464	get_pid(pid);
 465	old = rcu_replace_pointer(filp->pid, pid, 1);
 466	mutex_unlock(&dev->filelist_mutex);
 467
 468	synchronize_rcu();
 469	put_pid(old);
 
 
 
 470}
 471
 472/**
 473 * drm_release_noglobal - release method for DRM file
 474 * @inode: device inode
 475 * @filp: file pointer.
 476 *
 477 * This function may be used by drivers as their &file_operations.release
 478 * method. It frees any resources associated with the open file prior to taking
 479 * the drm_global_mutex. If this is the last open file for the DRM device, it
 480 * then restores the active in-kernel DRM client.
 
 481 *
 482 * RETURNS:
 
 483 * Always succeeds and returns 0.
 484 */
 485int drm_release_noglobal(struct inode *inode, struct file *filp)
 486{
 487	struct drm_file *file_priv = filp->private_data;
 488	struct drm_minor *minor = file_priv->minor;
 489	struct drm_device *dev = minor->dev;
 490
 491	drm_close_helper(filp);
 492
 493	if (atomic_dec_and_mutex_lock(&dev->open_count, &drm_global_mutex)) {
 494		drm_lastclose(dev);
 495		mutex_unlock(&drm_global_mutex);
 496	}
 497
 498	drm_minor_release(minor);
 499
 500	return 0;
 501}
 502EXPORT_SYMBOL(drm_release_noglobal);
 503
 504/**
 505 * drm_read - read method for DRM file
 506 * @filp: file pointer
 507 * @buffer: userspace destination pointer for the read
 508 * @count: count in bytes to read
 509 * @offset: offset to read
 510 *
 511 * This function must be used by drivers as their &file_operations.read
 512 * method if they use DRM events for asynchronous signalling to userspace.
 513 * Since events are used by the KMS API for vblank and page flip completion this
 514 * means all modern display drivers must use it.
 515 *
 516 * @offset is ignored, DRM events are read like a pipe. Polling support is
 517 * provided by drm_poll().
 518 *
 519 * This function will only ever read a full event. Therefore userspace must
 520 * supply a big enough buffer to fit any event to ensure forward progress. Since
 521 * the maximum event space is currently 4K it's recommended to just use that for
 522 * safety.
 523 *
 524 * RETURNS:
 
 525 * Number of bytes read (always aligned to full events, and can be 0) or a
 526 * negative error code on failure.
 527 */
 528ssize_t drm_read(struct file *filp, char __user *buffer,
 529		 size_t count, loff_t *offset)
 530{
 531	struct drm_file *file_priv = filp->private_data;
 532	struct drm_device *dev = file_priv->minor->dev;
 533	ssize_t ret;
 534
 535	ret = mutex_lock_interruptible(&file_priv->event_read_lock);
 536	if (ret)
 537		return ret;
 538
 539	for (;;) {
 540		struct drm_pending_event *e = NULL;
 541
 542		spin_lock_irq(&dev->event_lock);
 543		if (!list_empty(&file_priv->event_list)) {
 544			e = list_first_entry(&file_priv->event_list,
 545					struct drm_pending_event, link);
 546			file_priv->event_space += e->event->length;
 547			list_del(&e->link);
 548		}
 549		spin_unlock_irq(&dev->event_lock);
 550
 551		if (e == NULL) {
 552			if (ret)
 553				break;
 554
 555			if (filp->f_flags & O_NONBLOCK) {
 556				ret = -EAGAIN;
 557				break;
 558			}
 559
 560			mutex_unlock(&file_priv->event_read_lock);
 561			ret = wait_event_interruptible(file_priv->event_wait,
 562						       !list_empty(&file_priv->event_list));
 563			if (ret >= 0)
 564				ret = mutex_lock_interruptible(&file_priv->event_read_lock);
 565			if (ret)
 566				return ret;
 567		} else {
 568			unsigned length = e->event->length;
 569
 570			if (length > count - ret) {
 571put_back_event:
 572				spin_lock_irq(&dev->event_lock);
 573				file_priv->event_space -= length;
 574				list_add(&e->link, &file_priv->event_list);
 575				spin_unlock_irq(&dev->event_lock);
 576				wake_up_interruptible_poll(&file_priv->event_wait,
 577					EPOLLIN | EPOLLRDNORM);
 578				break;
 579			}
 580
 581			if (copy_to_user(buffer + ret, e->event, length)) {
 582				if (ret == 0)
 583					ret = -EFAULT;
 584				goto put_back_event;
 585			}
 586
 587			ret += length;
 588			kfree(e);
 589		}
 590	}
 591	mutex_unlock(&file_priv->event_read_lock);
 592
 593	return ret;
 594}
 595EXPORT_SYMBOL(drm_read);
 596
 597/**
 598 * drm_poll - poll method for DRM file
 599 * @filp: file pointer
 600 * @wait: poll waiter table
 601 *
 602 * This function must be used by drivers as their &file_operations.read method
 603 * if they use DRM events for asynchronous signalling to userspace.  Since
 604 * events are used by the KMS API for vblank and page flip completion this means
 605 * all modern display drivers must use it.
 606 *
 607 * See also drm_read().
 608 *
 609 * RETURNS:
 
 610 * Mask of POLL flags indicating the current status of the file.
 611 */
 612__poll_t drm_poll(struct file *filp, struct poll_table_struct *wait)
 613{
 614	struct drm_file *file_priv = filp->private_data;
 615	__poll_t mask = 0;
 616
 617	poll_wait(filp, &file_priv->event_wait, wait);
 618
 619	if (!list_empty(&file_priv->event_list))
 620		mask |= EPOLLIN | EPOLLRDNORM;
 621
 622	return mask;
 623}
 624EXPORT_SYMBOL(drm_poll);
 625
 626/**
 627 * drm_event_reserve_init_locked - init a DRM event and reserve space for it
 628 * @dev: DRM device
 629 * @file_priv: DRM file private data
 630 * @p: tracking structure for the pending event
 631 * @e: actual event data to deliver to userspace
 632 *
 633 * This function prepares the passed in event for eventual delivery. If the event
 634 * doesn't get delivered (because the IOCTL fails later on, before queuing up
 635 * anything) then the even must be cancelled and freed using
 636 * drm_event_cancel_free(). Successfully initialized events should be sent out
 637 * using drm_send_event() or drm_send_event_locked() to signal completion of the
 638 * asynchronous event to userspace.
 639 *
 640 * If callers embedded @p into a larger structure it must be allocated with
 641 * kmalloc and @p must be the first member element.
 642 *
 643 * This is the locked version of drm_event_reserve_init() for callers which
 644 * already hold &drm_device.event_lock.
 645 *
 646 * RETURNS:
 
 647 * 0 on success or a negative error code on failure.
 648 */
 649int drm_event_reserve_init_locked(struct drm_device *dev,
 650				  struct drm_file *file_priv,
 651				  struct drm_pending_event *p,
 652				  struct drm_event *e)
 653{
 654	if (file_priv->event_space < e->length)
 655		return -ENOMEM;
 656
 657	file_priv->event_space -= e->length;
 658
 659	p->event = e;
 660	list_add(&p->pending_link, &file_priv->pending_event_list);
 661	p->file_priv = file_priv;
 662
 663	return 0;
 664}
 665EXPORT_SYMBOL(drm_event_reserve_init_locked);
 666
 667/**
 668 * drm_event_reserve_init - init a DRM event and reserve space for it
 669 * @dev: DRM device
 670 * @file_priv: DRM file private data
 671 * @p: tracking structure for the pending event
 672 * @e: actual event data to deliver to userspace
 673 *
 674 * This function prepares the passed in event for eventual delivery. If the event
 675 * doesn't get delivered (because the IOCTL fails later on, before queuing up
 676 * anything) then the even must be cancelled and freed using
 677 * drm_event_cancel_free(). Successfully initialized events should be sent out
 678 * using drm_send_event() or drm_send_event_locked() to signal completion of the
 679 * asynchronous event to userspace.
 680 *
 681 * If callers embedded @p into a larger structure it must be allocated with
 682 * kmalloc and @p must be the first member element.
 683 *
 684 * Callers which already hold &drm_device.event_lock should use
 685 * drm_event_reserve_init_locked() instead.
 686 *
 687 * RETURNS:
 
 688 * 0 on success or a negative error code on failure.
 689 */
 690int drm_event_reserve_init(struct drm_device *dev,
 691			   struct drm_file *file_priv,
 692			   struct drm_pending_event *p,
 693			   struct drm_event *e)
 694{
 695	unsigned long flags;
 696	int ret;
 697
 698	spin_lock_irqsave(&dev->event_lock, flags);
 699	ret = drm_event_reserve_init_locked(dev, file_priv, p, e);
 700	spin_unlock_irqrestore(&dev->event_lock, flags);
 701
 702	return ret;
 703}
 704EXPORT_SYMBOL(drm_event_reserve_init);
 705
 706/**
 707 * drm_event_cancel_free - free a DRM event and release its space
 708 * @dev: DRM device
 709 * @p: tracking structure for the pending event
 710 *
 711 * This function frees the event @p initialized with drm_event_reserve_init()
 712 * and releases any allocated space. It is used to cancel an event when the
 713 * nonblocking operation could not be submitted and needed to be aborted.
 714 */
 715void drm_event_cancel_free(struct drm_device *dev,
 716			   struct drm_pending_event *p)
 717{
 718	unsigned long flags;
 719
 720	spin_lock_irqsave(&dev->event_lock, flags);
 721	if (p->file_priv) {
 722		p->file_priv->event_space += p->event->length;
 723		list_del(&p->pending_link);
 724	}
 725	spin_unlock_irqrestore(&dev->event_lock, flags);
 726
 727	if (p->fence)
 728		dma_fence_put(p->fence);
 729
 730	kfree(p);
 731}
 732EXPORT_SYMBOL(drm_event_cancel_free);
 733
 734static void drm_send_event_helper(struct drm_device *dev,
 735			   struct drm_pending_event *e, ktime_t timestamp)
 736{
 737	assert_spin_locked(&dev->event_lock);
 738
 739	if (e->completion) {
 740		complete_all(e->completion);
 741		e->completion_release(e->completion);
 742		e->completion = NULL;
 743	}
 744
 745	if (e->fence) {
 746		if (timestamp)
 747			dma_fence_signal_timestamp(e->fence, timestamp);
 748		else
 749			dma_fence_signal(e->fence);
 750		dma_fence_put(e->fence);
 751	}
 752
 753	if (!e->file_priv) {
 754		kfree(e);
 755		return;
 756	}
 757
 758	list_del(&e->pending_link);
 759	list_add_tail(&e->link,
 760		      &e->file_priv->event_list);
 761	wake_up_interruptible_poll(&e->file_priv->event_wait,
 762		EPOLLIN | EPOLLRDNORM);
 763}
 764
 765/**
 766 * drm_send_event_timestamp_locked - send DRM event to file descriptor
 767 * @dev: DRM device
 768 * @e: DRM event to deliver
 769 * @timestamp: timestamp to set for the fence event in kernel's CLOCK_MONOTONIC
 770 * time domain
 771 *
 772 * This function sends the event @e, initialized with drm_event_reserve_init(),
 773 * to its associated userspace DRM file. Callers must already hold
 774 * &drm_device.event_lock.
 775 *
 776 * Note that the core will take care of unlinking and disarming events when the
 777 * corresponding DRM file is closed. Drivers need not worry about whether the
 778 * DRM file for this event still exists and can call this function upon
 779 * completion of the asynchronous work unconditionally.
 780 */
 781void drm_send_event_timestamp_locked(struct drm_device *dev,
 782				     struct drm_pending_event *e, ktime_t timestamp)
 783{
 784	drm_send_event_helper(dev, e, timestamp);
 785}
 786EXPORT_SYMBOL(drm_send_event_timestamp_locked);
 787
 788/**
 789 * drm_send_event_locked - send DRM event to file descriptor
 790 * @dev: DRM device
 791 * @e: DRM event to deliver
 792 *
 793 * This function sends the event @e, initialized with drm_event_reserve_init(),
 794 * to its associated userspace DRM file. Callers must already hold
 795 * &drm_device.event_lock, see drm_send_event() for the unlocked version.
 796 *
 797 * Note that the core will take care of unlinking and disarming events when the
 798 * corresponding DRM file is closed. Drivers need not worry about whether the
 799 * DRM file for this event still exists and can call this function upon
 800 * completion of the asynchronous work unconditionally.
 801 */
 802void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e)
 803{
 804	drm_send_event_helper(dev, e, 0);
 805}
 806EXPORT_SYMBOL(drm_send_event_locked);
 807
 808/**
 809 * drm_send_event - send DRM event to file descriptor
 810 * @dev: DRM device
 811 * @e: DRM event to deliver
 812 *
 813 * This function sends the event @e, initialized with drm_event_reserve_init(),
 814 * to its associated userspace DRM file. This function acquires
 815 * &drm_device.event_lock, see drm_send_event_locked() for callers which already
 816 * hold this lock.
 817 *
 818 * Note that the core will take care of unlinking and disarming events when the
 819 * corresponding DRM file is closed. Drivers need not worry about whether the
 820 * DRM file for this event still exists and can call this function upon
 821 * completion of the asynchronous work unconditionally.
 822 */
 823void drm_send_event(struct drm_device *dev, struct drm_pending_event *e)
 824{
 825	unsigned long irqflags;
 826
 827	spin_lock_irqsave(&dev->event_lock, irqflags);
 828	drm_send_event_helper(dev, e, 0);
 829	spin_unlock_irqrestore(&dev->event_lock, irqflags);
 830}
 831EXPORT_SYMBOL(drm_send_event);
 832
 833static void print_size(struct drm_printer *p, const char *stat,
 834		       const char *region, u64 sz)
 835{
 836	const char *units[] = {"", " KiB", " MiB"};
 837	unsigned u;
 838
 839	for (u = 0; u < ARRAY_SIZE(units) - 1; u++) {
 840		if (sz == 0 || !IS_ALIGNED(sz, SZ_1K))
 841			break;
 842		sz = div_u64(sz, SZ_1K);
 843	}
 844
 845	drm_printf(p, "drm-%s-%s:\t%llu%s\n", stat, region, sz, units[u]);
 846}
 847
 848/**
 849 * drm_print_memory_stats - A helper to print memory stats
 850 * @p: The printer to print output to
 851 * @stats: The collected memory stats
 852 * @supported_status: Bitmask of optional stats which are available
 853 * @region: The memory region
 854 *
 855 */
 856void drm_print_memory_stats(struct drm_printer *p,
 857			    const struct drm_memory_stats *stats,
 858			    enum drm_gem_object_status supported_status,
 859			    const char *region)
 860{
 861	print_size(p, "total", region, stats->private + stats->shared);
 862	print_size(p, "shared", region, stats->shared);
 863	print_size(p, "active", region, stats->active);
 864
 865	if (supported_status & DRM_GEM_OBJECT_RESIDENT)
 866		print_size(p, "resident", region, stats->resident);
 867
 868	if (supported_status & DRM_GEM_OBJECT_PURGEABLE)
 869		print_size(p, "purgeable", region, stats->purgeable);
 870}
 871EXPORT_SYMBOL(drm_print_memory_stats);
 872
 873/**
 874 * drm_show_memory_stats - Helper to collect and show standard fdinfo memory stats
 875 * @p: the printer to print output to
 876 * @file: the DRM file
 877 *
 878 * Helper to iterate over GEM objects with a handle allocated in the specified
 879 * file.
 880 */
 881void drm_show_memory_stats(struct drm_printer *p, struct drm_file *file)
 882{
 883	struct drm_gem_object *obj;
 884	struct drm_memory_stats status = {};
 885	enum drm_gem_object_status supported_status = 0;
 886	int id;
 887
 888	spin_lock(&file->table_lock);
 889	idr_for_each_entry (&file->object_idr, obj, id) {
 890		enum drm_gem_object_status s = 0;
 891		size_t add_size = (obj->funcs && obj->funcs->rss) ?
 892			obj->funcs->rss(obj) : obj->size;
 893
 894		if (obj->funcs && obj->funcs->status) {
 895			s = obj->funcs->status(obj);
 896			supported_status = DRM_GEM_OBJECT_RESIDENT |
 897					DRM_GEM_OBJECT_PURGEABLE;
 898		}
 899
 900		if (drm_gem_object_is_shared_for_memory_stats(obj)) {
 901			status.shared += obj->size;
 902		} else {
 903			status.private += obj->size;
 904		}
 905
 906		if (s & DRM_GEM_OBJECT_RESIDENT) {
 907			status.resident += add_size;
 908		} else {
 909			/* If already purged or not yet backed by pages, don't
 910			 * count it as purgeable:
 911			 */
 912			s &= ~DRM_GEM_OBJECT_PURGEABLE;
 913		}
 914
 915		if (!dma_resv_test_signaled(obj->resv, dma_resv_usage_rw(true))) {
 916			status.active += add_size;
 917
 918			/* If still active, don't count as purgeable: */
 919			s &= ~DRM_GEM_OBJECT_PURGEABLE;
 920		}
 921
 922		if (s & DRM_GEM_OBJECT_PURGEABLE)
 923			status.purgeable += add_size;
 924	}
 925	spin_unlock(&file->table_lock);
 926
 927	drm_print_memory_stats(p, &status, supported_status, "memory");
 928}
 929EXPORT_SYMBOL(drm_show_memory_stats);
 930
 931/**
 932 * drm_show_fdinfo - helper for drm file fops
 933 * @m: output stream
 934 * @f: the device file instance
 935 *
 936 * Helper to implement fdinfo, for userspace to query usage stats, etc, of a
 937 * process using the GPU.  See also &drm_driver.show_fdinfo.
 938 *
 939 * For text output format description please see Documentation/gpu/drm-usage-stats.rst
 940 */
 941void drm_show_fdinfo(struct seq_file *m, struct file *f)
 942{
 943	struct drm_file *file = f->private_data;
 944	struct drm_device *dev = file->minor->dev;
 945	struct drm_printer p = drm_seq_file_printer(m);
 946
 947	drm_printf(&p, "drm-driver:\t%s\n", dev->driver->name);
 948	drm_printf(&p, "drm-client-id:\t%llu\n", file->client_id);
 949
 950	if (dev_is_pci(dev->dev)) {
 951		struct pci_dev *pdev = to_pci_dev(dev->dev);
 952
 953		drm_printf(&p, "drm-pdev:\t%04x:%02x:%02x.%d\n",
 954			   pci_domain_nr(pdev->bus), pdev->bus->number,
 955			   PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
 956	}
 957
 958	mutex_lock(&file->client_name_lock);
 959	if (file->client_name)
 960		drm_printf(&p, "drm-client-name:\t%s\n", file->client_name);
 961	mutex_unlock(&file->client_name_lock);
 962
 963	if (dev->driver->show_fdinfo)
 964		dev->driver->show_fdinfo(&p, file);
 965}
 966EXPORT_SYMBOL(drm_show_fdinfo);
 967
 968/**
 969 * mock_drm_getfile - Create a new struct file for the drm device
 970 * @minor: drm minor to wrap (e.g. #drm_device.primary)
 971 * @flags: file creation mode (O_RDWR etc)
 972 *
 973 * This create a new struct file that wraps a DRM file context around a
 974 * DRM minor. This mimicks userspace opening e.g. /dev/dri/card0, but without
 975 * invoking userspace. The struct file may be operated on using its f_op
 976 * (the drm_device.driver.fops) to mimick userspace operations, or be supplied
 977 * to userspace facing functions as an internal/anonymous client.
 978 *
 979 * RETURNS:
 980 * Pointer to newly created struct file, ERR_PTR on failure.
 981 */
 982struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags)
 983{
 984	struct drm_device *dev = minor->dev;
 985	struct drm_file *priv;
 986	struct file *file;
 987
 988	priv = drm_file_alloc(minor);
 989	if (IS_ERR(priv))
 990		return ERR_CAST(priv);
 991
 992	file = anon_inode_getfile("drm", dev->driver->fops, priv, flags);
 993	if (IS_ERR(file)) {
 994		drm_file_free(priv);
 995		return file;
 996	}
 997
 998	/* Everyone shares a single global address space */
 999	file->f_mapping = dev->anon_inode->i_mapping;
1000
1001	drm_dev_get(dev);
1002	priv->filp = file;
1003
1004	return file;
1005}
1006EXPORT_SYMBOL_FOR_TESTS_ONLY(mock_drm_getfile);