1 ===========================
2 drm/i915 Intel GFX Driver
3 ===========================
4
5 The drm/i915 driver supports all (with the exc
6 models) integrated GFX chipsets with both Inte
7 blocks. This excludes a set of SoC platforms w
8 those have basic support through the gma500 dr
9
10 Core Driver Infrastructure
11 ==========================
12
13 This section covers core driver infrastructure
14 and the GEM parts of the driver.
15
16 Runtime Power Management
17 ------------------------
18
19 .. kernel-doc:: drivers/gpu/drm/i915/intel_run
20 :doc: runtime pm
21
22 .. kernel-doc:: drivers/gpu/drm/i915/intel_run
23 :internal:
24
25 .. kernel-doc:: drivers/gpu/drm/i915/intel_unc
26 :internal:
27
28 Interrupt Handling
29 ------------------
30
31 .. kernel-doc:: drivers/gpu/drm/i915/i915_irq.
32 :doc: interrupt handling
33
34 .. kernel-doc:: drivers/gpu/drm/i915/i915_irq.
35 :functions: intel_irq_init intel_irq_init_h
36
37 .. kernel-doc:: drivers/gpu/drm/i915/i915_irq.
38 :functions: intel_runtime_pm_disable_interr
39
40 .. kernel-doc:: drivers/gpu/drm/i915/i915_irq.
41 :functions: intel_runtime_pm_enable_interru
42
43 Intel GVT-g Guest Support(vGPU)
44 -------------------------------
45
46 .. kernel-doc:: drivers/gpu/drm/i915/i915_vgpu
47 :doc: Intel GVT-g guest support
48
49 .. kernel-doc:: drivers/gpu/drm/i915/i915_vgpu
50 :internal:
51
52 Intel GVT-g Host Support(vGPU device model)
53 -------------------------------------------
54
55 .. kernel-doc:: drivers/gpu/drm/i915/intel_gvt
56 :doc: Intel GVT-g host support
57
58 .. kernel-doc:: drivers/gpu/drm/i915/intel_gvt
59 :internal:
60
61 Workarounds
62 -----------
63
64 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_
65 :doc: Hardware workarounds
66
67 Display Hardware Handling
68 =========================
69
70 This section covers everything related to the
71 the mode setting infrastructure, plane, sprite
72 display, output probing and related topics.
73
74 Mode Setting Infrastructure
75 ---------------------------
76
77 The i915 driver is thus far the only DRM drive
78 common DRM helper code to implement mode setti
79 its own tailor-made infrastructure for executi
80 change.
81
82 Frontbuffer Tracking
83 --------------------
84
85 .. kernel-doc:: drivers/gpu/drm/i915/display/i
86 :doc: frontbuffer tracking
87
88 .. kernel-doc:: drivers/gpu/drm/i915/display/i
89 :internal:
90
91 .. kernel-doc:: drivers/gpu/drm/i915/display/i
92 :internal:
93
94 Display FIFO Underrun Reporting
95 -------------------------------
96
97 .. kernel-doc:: drivers/gpu/drm/i915/display/i
98 :doc: fifo underrun handling
99
100 .. kernel-doc:: drivers/gpu/drm/i915/display/i
101 :internal:
102
103 Plane Configuration
104 -------------------
105
106 This section covers plane configuration and co
107 plane, sprites, cursors and overlays. This inc
108 to do atomic vsync'ed updates of all this stat
109 topics like watermark setup and computation, f
110 panel self refresh.
111
112 Atomic Plane Helpers
113 --------------------
114
115 .. kernel-doc:: drivers/gpu/drm/i915/display/i
116 :doc: atomic plane helpers
117
118 .. kernel-doc:: drivers/gpu/drm/i915/display/i
119 :internal:
120
121 Asynchronous Page Flip
122 ----------------------
123
124 .. kernel-doc:: drivers/gpu/drm/i915/display/i
125 :doc: asynchronous flip implementation
126
127 Output Probing
128 --------------
129
130 This section covers output probing and related
131 hotplug interrupt storm detection and mitigati
132 i915 driver still uses most of the common DRM
133 probing, so those sections fully apply.
134
135 Hotplug
136 -------
137
138 .. kernel-doc:: drivers/gpu/drm/i915/display/i
139 :doc: Hotplug
140
141 .. kernel-doc:: drivers/gpu/drm/i915/display/i
142 :internal:
143
144 High Definition Audio
145 ---------------------
146
147 .. kernel-doc:: drivers/gpu/drm/i915/display/i
148 :doc: High Definition Audio over HDMI and D
149
150 .. kernel-doc:: drivers/gpu/drm/i915/display/i
151 :internal:
152
153 .. kernel-doc:: include/drm/intel/i915_compone
154 :internal:
155
156 Intel HDMI LPE Audio Support
157 ----------------------------
158
159 .. kernel-doc:: drivers/gpu/drm/i915/display/i
160 :doc: LPE Audio integration for HDMI or DP
161
162 .. kernel-doc:: drivers/gpu/drm/i915/display/i
163 :internal:
164
165 Panel Self Refresh PSR (PSR/SRD)
166 --------------------------------
167
168 .. kernel-doc:: drivers/gpu/drm/i915/display/i
169 :doc: Panel Self Refresh (PSR/SRD)
170
171 .. kernel-doc:: drivers/gpu/drm/i915/display/i
172 :internal:
173
174 Frame Buffer Compression (FBC)
175 ------------------------------
176
177 .. kernel-doc:: drivers/gpu/drm/i915/display/i
178 :doc: Frame Buffer Compression (FBC)
179
180 .. kernel-doc:: drivers/gpu/drm/i915/display/i
181 :internal:
182
183 Display Refresh Rate Switching (DRRS)
184 -------------------------------------
185
186 .. kernel-doc:: drivers/gpu/drm/i915/display/i
187 :doc: Display Refresh Rate Switching (DRRS)
188
189 .. kernel-doc:: drivers/gpu/drm/i915/display/i
190 :internal:
191
192 DPIO
193 ----
194
195 .. kernel-doc:: drivers/gpu/drm/i915/display/i
196 :doc: DPIO
197
198 DMC Firmware Support
199 --------------------
200
201 .. kernel-doc:: drivers/gpu/drm/i915/display/i
202 :doc: DMC Firmware Support
203
204 .. kernel-doc:: drivers/gpu/drm/i915/display/i
205 :internal:
206
207 DMC wakelock support
208 --------------------
209
210 .. kernel-doc:: drivers/gpu/drm/i915/display/i
211 :doc: DMC wakelock support
212
213 Video BIOS Table (VBT)
214 ----------------------
215
216 .. kernel-doc:: drivers/gpu/drm/i915/display/i
217 :doc: Video BIOS Table (VBT)
218
219 .. kernel-doc:: drivers/gpu/drm/i915/display/i
220 :internal:
221
222 .. kernel-doc:: drivers/gpu/drm/i915/display/i
223 :internal:
224
225 Display clocks
226 --------------
227
228 .. kernel-doc:: drivers/gpu/drm/i915/display/i
229 :doc: CDCLK / RAWCLK
230
231 .. kernel-doc:: drivers/gpu/drm/i915/display/i
232 :internal:
233
234 Display PLLs
235 ------------
236
237 .. kernel-doc:: drivers/gpu/drm/i915/display/i
238 :doc: Display PLLs
239
240 .. kernel-doc:: drivers/gpu/drm/i915/display/i
241 :internal:
242
243 .. kernel-doc:: drivers/gpu/drm/i915/display/i
244 :internal:
245
246 Display State Buffer
247 --------------------
248
249 .. kernel-doc:: drivers/gpu/drm/i915/display/i
250 :doc: DSB
251
252 .. kernel-doc:: drivers/gpu/drm/i915/display/i
253 :internal:
254
255 GT Programming
256 ==============
257
258 Multicast/Replicated (MCR) Registers
259 ------------------------------------
260
261 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_
262 :doc: GT Multicast/Replicated (MCR) Registe
263
264 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_
265 :internal:
266
267 Memory Management and Command Submission
268 ========================================
269
270 This sections covers all things related to the
271 i915 driver.
272
273 Intel GPU Basics
274 ----------------
275
276 An Intel GPU has multiple engines. There are s
277
278 - Render Command Streamer (RCS). An engine for
279 performing compute.
280 - Blitting Command Streamer (BCS). An engine f
281 copying operations.
282 - Video Command Streamer. An engine used for v
283 sometimes called 'BSD' in hardware documenta
284 - Video Enhancement Command Streamer (VECS). A
285 Also sometimes called 'VEBOX' in hardware do
286 - Compute Command Streamer (CCS). An engine th
287 GPGPU pipelines, but not the 3D pipeline.
288 - Graphics Security Controller (GSCCS). A dedi
289 communication with GSC controller on securit
290 High-bandwidth Digital Content Protection (H
291 and HuC firmware authentication.
292
293 The Intel GPU family is a family of integrated
294 Memory Access. For having the GPU "do work", u
295 GPU batch buffers via one of the ioctls `DRM_I
296 or `DRM_IOCTL_I915_GEM_EXECBUFFER2_WR`. Most s
297 instruct the GPU to perform work (for example
298 needs memory from which to read and memory to
299 is encapsulated within GEM buffer objects (usu
300 `DRM_IOCTL_I915_GEM_CREATE`). An ioctl providi
301 to create will also list all GEM buffer object
302 and/or writes. For implementation details of m
303 `GEM BO Management Implementation Details`_.
304
305 The i915 driver allows user space to create a
306 `DRM_IOCTL_I915_GEM_CONTEXT_CREATE` which is i
307 integer. Such a context should be viewed by us
308 analogous to the idea of a CPU process of an o
309 driver guarantees that commands issued to a fi
310 executed so that writes of a previously issued
311 reads of following commands. Actions issued be
312 (even if from the same file descriptor) are NO
313 and the only way to synchronize across context
314 file descriptor) is through the use of fences.
315 Gen4, also have that a context carries with it
316 the HW context is essentially (most of at leas
317 In addition to the ordering guarantees, the ke
318 state via HW context when commands are issued
319 user space the need to restore (most of at lea
320 start of each batchbuffer. The non-deprecated
321 work can pass that ID (in the lower bits of dr
322 to identify what context to use with the comma
323
324 The GPU has its own memory management and addr
325 driver maintains the memory translation table
326 GPUs (i.e. those before Gen8), there is a sing
327 table, a global Graphics Translation Table (GT
328 GPUs each context has its own translation tabl
329 Graphics Translation Table (PPGTT). Of importa
330 PPGTT is named per-process it is actually per
331 submits a batchbuffer, the kernel walks the li
332 used by the batchbuffer and guarantees that no
333 each such GEM buffer object resident but it is
334 (PP)GTT. If the GEM buffer object is not yet p
335 then it is given an address. Two consequences
336 needs to edit the batchbuffer submitted to wri
337 the GPU address when a GEM BO is assigned a GP
338 might evict a different GEM BO from the (PP)GT
339 for another GEM BO. Consequently, the ioctls s
340 for execution also include a list of all locat
341 refer to GPU-addresses so that the kernel can
342 This process is dubbed relocation.
343
344 Locking Guidelines
345 ------------------
346
347 .. note::
348 This is a description of how the locking sh
349 refactoring is done. Does not necessarily r
350 looks like while WIP.
351
352 #. All locking rules and interface contracts w
353 (dma-buf, dma_fence) need to be followed.
354
355 #. No struct_mutex anywhere in the code
356
357 #. dma_resv will be the outermost lock (when n
358 is to be hoisted at highest level and passe
359 in the call chain
360
361 #. While holding lru/memory manager (buddy, dr
362 system memory allocations are not allowed
363
364 * Enforce this by priming lockdep (wit
365 allocate memory while holding these
366 of the shrinker vs. struct_mutex sag
367 real bad.
368
369 #. Do not nest different lru/memory manager lo
370 Take them in turn to update memory allocati
371 dma_resv ww_mutex to serialize against othe
372
373 #. The suggestion for lru/memory managers lock
374 enough to be spinlocks.
375
376 #. All features need to come with exhaustive k
377 IGT tests when appropriate
378
379 #. All LMEM uAPI paths need to be fully restar
380 for all locks/waits/sleeps)
381
382 * Error handling validation through si
383 Still the best strategy we have for
384 corner cases.
385 Must be excessively used in the IGT,
386 that we really have full path covera
387
388 * -EDEADLK handling with ww_mutex
389
390 GEM BO Management Implementation Details
391 ----------------------------------------
392
393 .. kernel-doc:: drivers/gpu/drm/i915/i915_vma_
394 :doc: Virtual Memory Address
395
396 Buffer Object Eviction
397 ----------------------
398
399 This section documents the interface functions
400 objects to make space available in the virtual
401 that this is mostly orthogonal to shrinking bu
402 has the goal to make main memory (shared with
403 unified memory architecture) available.
404
405 .. kernel-doc:: drivers/gpu/drm/i915/i915_gem_
406 :internal:
407
408 Buffer Object Memory Shrinking
409 ------------------------------
410
411 This section documents the interface function
412 of buffer object caches. Shrinking is used to
413 available. Note that this is mostly orthogonal
414 objects, which has the goal to make space in g
415
416 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_
417 :internal:
418
419 Batchbuffer Parsing
420 -------------------
421
422 .. kernel-doc:: drivers/gpu/drm/i915/i915_cmd_
423 :doc: batch buffer command parser
424
425 .. kernel-doc:: drivers/gpu/drm/i915/i915_cmd_
426 :internal:
427
428 User Batchbuffer Execution
429 --------------------------
430
431 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_
432
433 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_
434 :doc: User command execution
435
436 Scheduling
437 ----------
438 .. kernel-doc:: drivers/gpu/drm/i915/i915_sche
439 :functions: i915_sched_engine
440
441 Logical Rings, Logical Ring Contexts and Execl
442 ----------------------------------------------
443
444 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_
445 :doc: Logical Rings, Logical Ring Contexts
446
447 Global GTT views
448 ----------------
449
450 .. kernel-doc:: drivers/gpu/drm/i915/i915_vma_
451 :doc: Global GTT views
452
453 .. kernel-doc:: drivers/gpu/drm/i915/i915_gem_
454 :internal:
455
456 GTT Fences and Swizzling
457 ------------------------
458
459 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_
460 :internal:
461
462 Global GTT Fence Handling
463 ~~~~~~~~~~~~~~~~~~~~~~~~~
464
465 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_
466 :doc: fence register handling
467
468 Hardware Tiling and Swizzling Details
469 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
470
471 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_
472 :doc: tiling swizzling details
473
474 Object Tiling IOCTLs
475 --------------------
476
477 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_
478 :internal:
479
480 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_
481 :doc: buffer object tiling
482
483 Protected Objects
484 -----------------
485
486 .. kernel-doc:: drivers/gpu/drm/i915/pxp/intel
487 :doc: PXP
488
489 .. kernel-doc:: drivers/gpu/drm/i915/pxp/intel
490
491 Microcontrollers
492 ================
493
494 Starting from gen9, three microcontrollers are
495 graphics microcontroller (GuC), the HEVC/H.265
496 display microcontroller (DMC). The driver is r
497 firmwares on the microcontrollers; the GuC and
498 to WOPCM using the DMA engine, while the DMC f
499
500 WOPCM
501 -----
502
503 WOPCM Layout
504 ~~~~~~~~~~~~
505
506 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_
507 :doc: WOPCM Layout
508
509 GuC
510 ---
511
512 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int
513 :doc: GuC
514
515 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int
516
517 GuC Firmware Layout
518 ~~~~~~~~~~~~~~~~~~~
519
520 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int
521 :doc: Firmware Layout
522
523 GuC Memory Management
524 ~~~~~~~~~~~~~~~~~~~~~
525
526 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int
527 :doc: GuC Memory Management
528 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int
529 :functions: intel_guc_allocate_vma
530
531
532 GuC-specific firmware loader
533 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
534
535 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int
536 :internal:
537
538 GuC-based command submission
539 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
540
541 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int
542 :doc: GuC-based command submission
543
544 GuC ABI
545 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
546
547 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi
548 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi
549 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi
550 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi
551 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi
552
553 HuC
554 ---
555 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int
556 :doc: HuC
557 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int
558 :functions: intel_huc_auth
559
560 HuC Memory Management
561 ~~~~~~~~~~~~~~~~~~~~~
562
563 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int
564 :doc: HuC Memory Management
565
566 HuC Firmware Layout
567 ~~~~~~~~~~~~~~~~~~~
568 The HuC FW layout is the same as the GuC one,
569
570 DMC
571 ---
572 See `DMC Firmware Support`_
573
574 Tracing
575 =======
576
577 This sections covers all things related to the
578 in the i915 driver.
579
580 i915_ppgtt_create and i915_ppgtt_release
581 ----------------------------------------
582
583 .. kernel-doc:: drivers/gpu/drm/i915/i915_trac
584 :doc: i915_ppgtt_create and i915_ppgtt_rele
585
586 i915_context_create and i915_context_free
587 -----------------------------------------
588
589 .. kernel-doc:: drivers/gpu/drm/i915/i915_trac
590 :doc: i915_context_create and i915_context_
591
592 Perf
593 ====
594
595 Overview
596 --------
597 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
598 :doc: i915 Perf Overview
599
600 Comparison with Core Perf
601 -------------------------
602 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
603 :doc: i915 Perf History and Comparison with
604
605 i915 Driver Entry Points
606 ------------------------
607
608 This section covers the entrypoints exported o
609 integrate with drm/i915 and to handle the `DRM
610
611 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
612 :functions: i915_perf_init
613 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
614 :functions: i915_perf_fini
615 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
616 :functions: i915_perf_register
617 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
618 :functions: i915_perf_unregister
619 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
620 :functions: i915_perf_open_ioctl
621 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
622 :functions: i915_perf_release
623 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
624 :functions: i915_perf_add_config_ioctl
625 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
626 :functions: i915_perf_remove_config_ioctl
627
628 i915 Perf Stream
629 ----------------
630
631 This section covers the stream-semantics-agnos
632 for representing an i915 perf stream FD and as
633
634 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
635 :functions: i915_perf_stream
636 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
637 :functions: i915_perf_stream_ops
638
639 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
640 :functions: read_properties_unlocked
641 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
642 :functions: i915_perf_open_ioctl_locked
643 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
644 :functions: i915_perf_destroy_locked
645 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
646 :functions: i915_perf_read
647 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
648 :functions: i915_perf_ioctl
649 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
650 :functions: i915_perf_enable_locked
651 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
652 :functions: i915_perf_disable_locked
653 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
654 :functions: i915_perf_poll
655 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
656 :functions: i915_perf_poll_locked
657
658 i915 Perf Observation Architecture Stream
659 -----------------------------------------
660
661 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
662 :functions: i915_oa_ops
663
664 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
665 :functions: i915_oa_stream_init
666 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
667 :functions: i915_oa_read
668 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
669 :functions: i915_oa_stream_enable
670 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
671 :functions: i915_oa_stream_disable
672 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
673 :functions: i915_oa_wait_unlocked
674 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
675 :functions: i915_oa_poll_wait
676
677 Other i915 Perf Internals
678 -------------------------
679
680 This section simply includes all other current
681 in no particular order, but may include some m
682 specific details than found in the more high-l
683
684 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf
685 :internal:
686 :no-identifiers:
687 i915_perf_init
688 i915_perf_fini
689 i915_perf_register
690 i915_perf_unregister
691 i915_perf_open_ioctl
692 i915_perf_release
693 i915_perf_add_config_ioctl
694 i915_perf_remove_config_ioctl
695 read_properties_unlocked
696 i915_perf_open_ioctl_locked
697 i915_perf_destroy_locked
698 i915_perf_read i915_perf_ioctl
699 i915_perf_enable_locked
700 i915_perf_disable_locked
701 i915_perf_poll i915_perf_poll_locked
702 i915_oa_stream_init i915_oa_read
703 i915_oa_stream_enable
704 i915_oa_stream_disable
705 i915_oa_wait_unlocked
706 i915_oa_poll_wait
707
708 Style
709 =====
710
711 The drm/i915 driver codebase has some style ru
712 cases, deviating from) the kernel coding style
713
714 Register macro definition style
715 -------------------------------
716
717 The style guide for ``i915_reg.h``.
718
719 .. kernel-doc:: drivers/gpu/drm/i915/i915_reg.
720 :doc: The i915 register macro definition st
721
722 .. _i915-usage-stats:
723
724 i915 DRM client usage stats implementation
725 ==========================================
726
727 The drm/i915 driver implements the DRM client
728 documented in :ref:`drm-client-usage-stats`.
729
730 Example of the output showing the implemented
731 the currently possible format options:
732
733 ::
734
735 pos: 0
736 flags: 0100002
737 mnt_id: 21
738 drm-driver: i915
739 drm-pdev: 0000:00:02.0
740 drm-client-id: 7
741 drm-engine-render: 9288864723 ns
742 drm-engine-copy: 2035071108 ns
743 drm-engine-video: 0 ns
744 drm-engine-capacity-video: 2
745 drm-engine-video-enhance: 0 ns
746
747 Possible `drm-engine-` key names are: `render`
748 `video-enhance`.
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