summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/xe/xe_device.c
blob: 5176c27e4b6a4c59739f5e456f79ca7d8a77ce94 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
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
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
// SPDX-License-Identifier: MIT
/*
 * Copyright © 2021 Intel Corporation
 */

#include "xe_device.h"

#include <linux/units.h>

#include <drm/drm_aperture.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_gem_ttm_helper.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_managed.h>
#include <drm/drm_print.h>
#include <drm/xe_drm.h>

#include "regs/xe_gt_regs.h"
#include "regs/xe_regs.h"
#include "xe_bo.h"
#include "xe_debugfs.h"
#include "xe_display.h"
#include "xe_dma_buf.h"
#include "xe_drm_client.h"
#include "xe_drv.h"
#include "xe_exec_queue.h"
#include "xe_exec.h"
#include "xe_ggtt.h"
#include "xe_gt.h"
#include "xe_gt_mcr.h"
#include "xe_irq.h"
#include "xe_mmio.h"
#include "xe_module.h"
#include "xe_pat.h"
#include "xe_pcode.h"
#include "xe_pm.h"
#include "xe_query.h"
#include "xe_tile.h"
#include "xe_ttm_stolen_mgr.h"
#include "xe_ttm_sys_mgr.h"
#include "xe_vm.h"
#include "xe_wait_user_fence.h"
#include "xe_hwmon.h"

#ifdef CONFIG_LOCKDEP
struct lockdep_map xe_device_mem_access_lockdep_map = {
	.name = "xe_device_mem_access_lockdep_map"
};
#endif

static int xe_file_open(struct drm_device *dev, struct drm_file *file)
{
	struct xe_device *xe = to_xe_device(dev);
	struct xe_drm_client *client;
	struct xe_file *xef;
	int ret = -ENOMEM;

	xef = kzalloc(sizeof(*xef), GFP_KERNEL);
	if (!xef)
		return ret;

	client = xe_drm_client_alloc();
	if (!client) {
		kfree(xef);
		return ret;
	}

	xef->drm = file;
	xef->client = client;
	xef->xe = xe;

	mutex_init(&xef->vm.lock);
	xa_init_flags(&xef->vm.xa, XA_FLAGS_ALLOC1);

	mutex_init(&xef->exec_queue.lock);
	xa_init_flags(&xef->exec_queue.xa, XA_FLAGS_ALLOC1);

	spin_lock(&xe->clients.lock);
	xe->clients.count++;
	spin_unlock(&xe->clients.lock);

	file->driver_priv = xef;
	return 0;
}

static void xe_file_close(struct drm_device *dev, struct drm_file *file)
{
	struct xe_device *xe = to_xe_device(dev);
	struct xe_file *xef = file->driver_priv;
	struct xe_vm *vm;
	struct xe_exec_queue *q;
	unsigned long idx;

	mutex_lock(&xef->exec_queue.lock);
	xa_for_each(&xef->exec_queue.xa, idx, q) {
		xe_exec_queue_kill(q);
		xe_exec_queue_put(q);
	}
	mutex_unlock(&xef->exec_queue.lock);
	xa_destroy(&xef->exec_queue.xa);
	mutex_destroy(&xef->exec_queue.lock);
	mutex_lock(&xef->vm.lock);
	xa_for_each(&xef->vm.xa, idx, vm)
		xe_vm_close_and_put(vm);
	mutex_unlock(&xef->vm.lock);
	xa_destroy(&xef->vm.xa);
	mutex_destroy(&xef->vm.lock);

	spin_lock(&xe->clients.lock);
	xe->clients.count--;
	spin_unlock(&xe->clients.lock);

	xe_drm_client_put(xef->client);
	kfree(xef);
}

static const struct drm_ioctl_desc xe_ioctls[] = {
	DRM_IOCTL_DEF_DRV(XE_DEVICE_QUERY, xe_query_ioctl, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(XE_GEM_CREATE, xe_gem_create_ioctl, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(XE_GEM_MMAP_OFFSET, xe_gem_mmap_offset_ioctl,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(XE_VM_CREATE, xe_vm_create_ioctl, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(XE_VM_DESTROY, xe_vm_destroy_ioctl, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(XE_VM_BIND, xe_vm_bind_ioctl, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(XE_EXEC, xe_exec_ioctl, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(XE_EXEC_QUEUE_CREATE, xe_exec_queue_create_ioctl,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(XE_EXEC_QUEUE_DESTROY, xe_exec_queue_destroy_ioctl,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(XE_EXEC_QUEUE_GET_PROPERTY, xe_exec_queue_get_property_ioctl,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(XE_WAIT_USER_FENCE, xe_wait_user_fence_ioctl,
			  DRM_RENDER_ALLOW),
};

static const struct file_operations xe_driver_fops = {
	.owner = THIS_MODULE,
	.open = drm_open,
	.release = drm_release_noglobal,
	.unlocked_ioctl = drm_ioctl,
	.mmap = drm_gem_mmap,
	.poll = drm_poll,
	.read = drm_read,
	.compat_ioctl = drm_compat_ioctl,
	.llseek = noop_llseek,
#ifdef CONFIG_PROC_FS
	.show_fdinfo = drm_show_fdinfo,
#endif
};

static void xe_driver_release(struct drm_device *dev)
{
	struct xe_device *xe = to_xe_device(dev);

	pci_set_drvdata(to_pci_dev(xe->drm.dev), NULL);
}

static struct drm_driver driver = {
	/* Don't use MTRRs here; the Xserver or userspace app should
	 * deal with them for Intel hardware.
	 */
	.driver_features =
	    DRIVER_GEM |
	    DRIVER_RENDER | DRIVER_SYNCOBJ |
	    DRIVER_SYNCOBJ_TIMELINE | DRIVER_GEM_GPUVA,
	.open = xe_file_open,
	.postclose = xe_file_close,

	.gem_prime_import = xe_gem_prime_import,

	.dumb_create = xe_bo_dumb_create,
	.dumb_map_offset = drm_gem_ttm_dumb_map_offset,
#ifdef CONFIG_PROC_FS
	.show_fdinfo = xe_drm_client_fdinfo,
#endif
	.release = &xe_driver_release,

	.ioctls = xe_ioctls,
	.num_ioctls = ARRAY_SIZE(xe_ioctls),
	.fops = &xe_driver_fops,
	.name = DRIVER_NAME,
	.desc = DRIVER_DESC,
	.date = DRIVER_DATE,
	.major = DRIVER_MAJOR,
	.minor = DRIVER_MINOR,
	.patchlevel = DRIVER_PATCHLEVEL,
};

static void xe_device_destroy(struct drm_device *dev, void *dummy)
{
	struct xe_device *xe = to_xe_device(dev);

	if (xe->ordered_wq)
		destroy_workqueue(xe->ordered_wq);

	if (xe->unordered_wq)
		destroy_workqueue(xe->unordered_wq);

	ttm_device_fini(&xe->ttm);
}

struct xe_device *xe_device_create(struct pci_dev *pdev,
				   const struct pci_device_id *ent)
{
	struct xe_device *xe;
	int err;

	xe_display_driver_set_hooks(&driver);

	err = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver);
	if (err)
		return ERR_PTR(err);

	xe = devm_drm_dev_alloc(&pdev->dev, &driver, struct xe_device, drm);
	if (IS_ERR(xe))
		return xe;

	err = ttm_device_init(&xe->ttm, &xe_ttm_funcs, xe->drm.dev,
			      xe->drm.anon_inode->i_mapping,
			      xe->drm.vma_offset_manager, false, false);
	if (WARN_ON(err))
		goto err;

	err = drmm_add_action_or_reset(&xe->drm, xe_device_destroy, NULL);
	if (err)
		goto err;

	xe->info.devid = pdev->device;
	xe->info.revid = pdev->revision;
	xe->info.force_execlist = xe_modparam.force_execlist;

	spin_lock_init(&xe->irq.lock);
	spin_lock_init(&xe->clients.lock);

	init_waitqueue_head(&xe->ufence_wq);

	drmm_mutex_init(&xe->drm, &xe->usm.lock);
	xa_init_flags(&xe->usm.asid_to_vm, XA_FLAGS_ALLOC);

	if (IS_ENABLED(CONFIG_DRM_XE_DEBUG)) {
		/* Trigger a large asid and an early asid wrap. */
		u32 asid;

		BUILD_BUG_ON(XE_MAX_ASID < 2);
		err = xa_alloc_cyclic(&xe->usm.asid_to_vm, &asid, NULL,
				      XA_LIMIT(XE_MAX_ASID - 2, XE_MAX_ASID - 1),
				      &xe->usm.next_asid, GFP_KERNEL);
		drm_WARN_ON(&xe->drm, err);
		if (err >= 0)
			xa_erase(&xe->usm.asid_to_vm, asid);
	}

	spin_lock_init(&xe->pinned.lock);
	INIT_LIST_HEAD(&xe->pinned.kernel_bo_present);
	INIT_LIST_HEAD(&xe->pinned.external_vram);
	INIT_LIST_HEAD(&xe->pinned.evicted);

	xe->ordered_wq = alloc_ordered_workqueue("xe-ordered-wq", 0);
	xe->unordered_wq = alloc_workqueue("xe-unordered-wq", 0, 0);
	if (!xe->ordered_wq || !xe->unordered_wq) {
		drm_err(&xe->drm, "Failed to allocate xe workqueues\n");
		err = -ENOMEM;
		goto err;
	}

	err = xe_display_create(xe);
	if (WARN_ON(err))
		goto err;

	return xe;

err:
	return ERR_PTR(err);
}

/*
 * The driver-initiated FLR is the highest level of reset that we can trigger
 * from within the driver. It is different from the PCI FLR in that it doesn't
 * fully reset the SGUnit and doesn't modify the PCI config space and therefore
 * it doesn't require a re-enumeration of the PCI BARs. However, the
 * driver-initiated FLR does still cause a reset of both GT and display and a
 * memory wipe of local and stolen memory, so recovery would require a full HW
 * re-init and saving/restoring (or re-populating) the wiped memory. Since we
 * perform the FLR as the very last action before releasing access to the HW
 * during the driver release flow, we don't attempt recovery at all, because
 * if/when a new instance of i915 is bound to the device it will do a full
 * re-init anyway.
 */
static void xe_driver_flr(struct xe_device *xe)
{
	const unsigned int flr_timeout = 3 * MICRO; /* specs recommend a 3s wait */
	struct xe_gt *gt = xe_root_mmio_gt(xe);
	int ret;

	if (xe_mmio_read32(gt, GU_CNTL_PROTECTED) & DRIVERINT_FLR_DIS) {
		drm_info_once(&xe->drm, "BIOS Disabled Driver-FLR\n");
		return;
	}

	drm_dbg(&xe->drm, "Triggering Driver-FLR\n");

	/*
	 * Make sure any pending FLR requests have cleared by waiting for the
	 * FLR trigger bit to go to zero. Also clear GU_DEBUG's DRIVERFLR_STATUS
	 * to make sure it's not still set from a prior attempt (it's a write to
	 * clear bit).
	 * Note that we should never be in a situation where a previous attempt
	 * is still pending (unless the HW is totally dead), but better to be
	 * safe in case something unexpected happens
	 */
	ret = xe_mmio_wait32(gt, GU_CNTL, DRIVERFLR, 0, flr_timeout, NULL, false);
	if (ret) {
		drm_err(&xe->drm, "Driver-FLR-prepare wait for ready failed! %d\n", ret);
		return;
	}
	xe_mmio_write32(gt, GU_DEBUG, DRIVERFLR_STATUS);

	/* Trigger the actual Driver-FLR */
	xe_mmio_rmw32(gt, GU_CNTL, 0, DRIVERFLR);

	/* Wait for hardware teardown to complete */
	ret = xe_mmio_wait32(gt, GU_CNTL, DRIVERFLR, 0, flr_timeout, NULL, false);
	if (ret) {
		drm_err(&xe->drm, "Driver-FLR-teardown wait completion failed! %d\n", ret);
		return;
	}

	/* Wait for hardware/firmware re-init to complete */
	ret = xe_mmio_wait32(gt, GU_DEBUG, DRIVERFLR_STATUS, DRIVERFLR_STATUS,
			     flr_timeout, NULL, false);
	if (ret) {
		drm_err(&xe->drm, "Driver-FLR-reinit wait completion failed! %d\n", ret);
		return;
	}

	/* Clear sticky completion status */
	xe_mmio_write32(gt, GU_DEBUG, DRIVERFLR_STATUS);
}

static void xe_driver_flr_fini(struct drm_device *drm, void *arg)
{
	struct xe_device *xe = arg;

	if (xe->needs_flr_on_fini)
		xe_driver_flr(xe);
}

static void xe_device_sanitize(struct drm_device *drm, void *arg)
{
	struct xe_device *xe = arg;
	struct xe_gt *gt;
	u8 id;

	for_each_gt(gt, xe, id)
		xe_gt_sanitize(gt);
}

static int xe_set_dma_info(struct xe_device *xe)
{
	unsigned int mask_size = xe->info.dma_mask_size;
	int err;

	dma_set_max_seg_size(xe->drm.dev, xe_sg_segment_size(xe->drm.dev));

	err = dma_set_mask(xe->drm.dev, DMA_BIT_MASK(mask_size));
	if (err)
		goto mask_err;

	err = dma_set_coherent_mask(xe->drm.dev, DMA_BIT_MASK(mask_size));
	if (err)
		goto mask_err;

	return 0;

mask_err:
	drm_err(&xe->drm, "Can't set DMA mask/consistent mask (%d)\n", err);
	return err;
}

/*
 * Initialize MMIO resources that don't require any knowledge about tile count.
 */
int xe_device_probe_early(struct xe_device *xe)
{
	int err;

	err = xe_mmio_init(xe);
	if (err)
		return err;

	err = xe_mmio_root_tile_init(xe);
	if (err)
		return err;

	return 0;
}

static int xe_device_set_has_flat_ccs(struct  xe_device *xe)
{
	u32 reg;
	int err;

	if (GRAPHICS_VER(xe) < 20 || !xe->info.has_flat_ccs)
		return 0;

	struct xe_gt *gt = xe_root_mmio_gt(xe);

	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
	if (err)
		return err;

	reg = xe_gt_mcr_unicast_read_any(gt, XE2_FLAT_CCS_BASE_RANGE_LOWER);
	xe->info.has_flat_ccs = (reg & XE2_FLAT_CCS_ENABLE);

	if (!xe->info.has_flat_ccs)
		drm_dbg(&xe->drm,
			"Flat CCS has been disabled in bios, May lead to performance impact");

	return xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
}

int xe_device_probe(struct xe_device *xe)
{
	struct xe_tile *tile;
	struct xe_gt *gt;
	int err;
	u8 id;

	xe_pat_init_early(xe);

	xe->info.mem_region_mask = 1;
	err = xe_display_init_nommio(xe);
	if (err)
		return err;

	err = xe_set_dma_info(xe);
	if (err)
		return err;

	xe_mmio_probe_tiles(xe);

	xe_ttm_sys_mgr_init(xe);

	for_each_gt(gt, xe, id)
		xe_force_wake_init_gt(gt, gt_to_fw(gt));

	for_each_tile(tile, xe, id) {
		err = xe_ggtt_init_early(tile->mem.ggtt);
		if (err)
			return err;
	}

	err = drmm_add_action_or_reset(&xe->drm, xe_driver_flr_fini, xe);
	if (err)
		return err;

	for_each_gt(gt, xe, id) {
		err = xe_pcode_probe(gt);
		if (err)
			return err;
	}

	err = xe_display_init_noirq(xe);
	if (err)
		return err;

	err = xe_irq_install(xe);
	if (err)
		goto err;

	for_each_gt(gt, xe, id) {
		err = xe_gt_init_early(gt);
		if (err)
			goto err_irq_shutdown;
	}

	err = xe_device_set_has_flat_ccs(xe);
	if (err)
		goto err_irq_shutdown;

	err = xe_mmio_probe_vram(xe);
	if (err)
		goto err_irq_shutdown;

	for_each_tile(tile, xe, id) {
		err = xe_tile_init_noalloc(tile);
		if (err)
			goto err_irq_shutdown;
	}

	/* Allocate and map stolen after potential VRAM resize */
	xe_ttm_stolen_mgr_init(xe);

	/*
	 * Now that GT is initialized (TTM in particular),
	 * we can try to init display, and inherit the initial fb.
	 * This is the reason the first allocation needs to be done
	 * inside display.
	 */
	err = xe_display_init_noaccel(xe);
	if (err)
		goto err_irq_shutdown;

	for_each_gt(gt, xe, id) {
		err = xe_gt_init(gt);
		if (err)
			goto err_irq_shutdown;
	}

	xe_heci_gsc_init(xe);

	err = xe_display_init(xe);
	if (err)
		goto err_irq_shutdown;

	err = drm_dev_register(&xe->drm, 0);
	if (err)
		goto err_fini_display;

	xe_display_register(xe);

	xe_debugfs_register(xe);

	xe_hwmon_register(xe);

	err = drmm_add_action_or_reset(&xe->drm, xe_device_sanitize, xe);
	if (err)
		return err;

	return 0;

err_fini_display:
	xe_display_driver_remove(xe);

err_irq_shutdown:
	xe_irq_shutdown(xe);
err:
	xe_display_fini(xe);
	return err;
}

static void xe_device_remove_display(struct xe_device *xe)
{
	xe_display_unregister(xe);

	drm_dev_unplug(&xe->drm);
	xe_display_driver_remove(xe);
}

void xe_device_remove(struct xe_device *xe)
{
	xe_device_remove_display(xe);

	xe_display_fini(xe);

	xe_heci_gsc_fini(xe);

	xe_irq_shutdown(xe);
}

void xe_device_shutdown(struct xe_device *xe)
{
}

void xe_device_wmb(struct xe_device *xe)
{
	struct xe_gt *gt = xe_root_mmio_gt(xe);

	wmb();
	if (IS_DGFX(xe))
		xe_mmio_write32(gt, SOFTWARE_FLAGS_SPR33, 0);
}

u32 xe_device_ccs_bytes(struct xe_device *xe, u64 size)
{
	return xe_device_has_flat_ccs(xe) ?
		DIV_ROUND_UP_ULL(size, NUM_BYTES_PER_CCS_BYTE(xe)) : 0;
}

bool xe_device_mem_access_ongoing(struct xe_device *xe)
{
	if (xe_pm_read_callback_task(xe) != NULL)
		return true;

	return atomic_read(&xe->mem_access.ref);
}

void xe_device_assert_mem_access(struct xe_device *xe)
{
	XE_WARN_ON(!xe_device_mem_access_ongoing(xe));
}

bool xe_device_mem_access_get_if_ongoing(struct xe_device *xe)
{
	bool active;

	if (xe_pm_read_callback_task(xe) == current)
		return true;

	active = xe_pm_runtime_get_if_active(xe);
	if (active) {
		int ref = atomic_inc_return(&xe->mem_access.ref);

		xe_assert(xe, ref != S32_MAX);
	}

	return active;
}

void xe_device_mem_access_get(struct xe_device *xe)
{
	int ref;

	/*
	 * This looks racy, but should be fine since the pm_callback_task only
	 * transitions from NULL -> current (and back to NULL again), during the
	 * runtime_resume() or runtime_suspend() callbacks, for which there can
	 * only be a single one running for our device. We only need to prevent
	 * recursively calling the runtime_get or runtime_put from those
	 * callbacks, as well as preventing triggering any access_ongoing
	 * asserts.
	 */
	if (xe_pm_read_callback_task(xe) == current)
		return;

	/*
	 * Since the resume here is synchronous it can be quite easy to deadlock
	 * if we are not careful. Also in practice it might be quite timing
	 * sensitive to ever see the 0 -> 1 transition with the callers locks
	 * held, so deadlocks might exist but are hard for lockdep to ever see.
	 * With this in mind, help lockdep learn about the potentially scary
	 * stuff that can happen inside the runtime_resume callback by acquiring
	 * a dummy lock (it doesn't protect anything and gets compiled out on
	 * non-debug builds).  Lockdep then only needs to see the
	 * mem_access_lockdep_map -> runtime_resume callback once, and then can
	 * hopefully validate all the (callers_locks) -> mem_access_lockdep_map.
	 * For example if the (callers_locks) are ever grabbed in the
	 * runtime_resume callback, lockdep should give us a nice splat.
	 */
	lock_map_acquire(&xe_device_mem_access_lockdep_map);
	lock_map_release(&xe_device_mem_access_lockdep_map);

	xe_pm_runtime_get(xe);
	ref = atomic_inc_return(&xe->mem_access.ref);

	xe_assert(xe, ref != S32_MAX);

}

void xe_device_mem_access_put(struct xe_device *xe)
{
	int ref;

	if (xe_pm_read_callback_task(xe) == current)
		return;

	ref = atomic_dec_return(&xe->mem_access.ref);
	xe_pm_runtime_put(xe);

	xe_assert(xe, ref >= 0);
}