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[J-linux.git] / drivers / gpu / drm / xe / xe_exec_queue.c
1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright © 2021 Intel Corporation
4  */
5
6 #include "xe_exec_queue.h"
7
8 #include <linux/nospec.h>
9
10 #include <drm/drm_device.h>
11 #include <drm/drm_drv.h>
12 #include <drm/drm_file.h>
13 #include <uapi/drm/xe_drm.h>
14
15 #include "xe_device.h"
16 #include "xe_gt.h"
17 #include "xe_hw_engine_class_sysfs.h"
18 #include "xe_hw_engine_group.h"
19 #include "xe_hw_fence.h"
20 #include "xe_lrc.h"
21 #include "xe_macros.h"
22 #include "xe_migrate.h"
23 #include "xe_pm.h"
24 #include "xe_ring_ops_types.h"
25 #include "xe_trace.h"
26 #include "xe_vm.h"
27
28 enum xe_exec_queue_sched_prop {
29         XE_EXEC_QUEUE_JOB_TIMEOUT = 0,
30         XE_EXEC_QUEUE_TIMESLICE = 1,
31         XE_EXEC_QUEUE_PREEMPT_TIMEOUT = 2,
32         XE_EXEC_QUEUE_SCHED_PROP_MAX = 3,
33 };
34
35 static int exec_queue_user_extensions(struct xe_device *xe, struct xe_exec_queue *q,
36                                       u64 extensions, int ext_number);
37
38 static void __xe_exec_queue_free(struct xe_exec_queue *q)
39 {
40         if (q->vm)
41                 xe_vm_put(q->vm);
42
43         if (q->xef)
44                 xe_file_put(q->xef);
45
46         kfree(q);
47 }
48
49 static struct xe_exec_queue *__xe_exec_queue_alloc(struct xe_device *xe,
50                                                    struct xe_vm *vm,
51                                                    u32 logical_mask,
52                                                    u16 width, struct xe_hw_engine *hwe,
53                                                    u32 flags, u64 extensions)
54 {
55         struct xe_exec_queue *q;
56         struct xe_gt *gt = hwe->gt;
57         int err;
58
59         /* only kernel queues can be permanent */
60         XE_WARN_ON((flags & EXEC_QUEUE_FLAG_PERMANENT) && !(flags & EXEC_QUEUE_FLAG_KERNEL));
61
62         q = kzalloc(struct_size(q, lrc, width), GFP_KERNEL);
63         if (!q)
64                 return ERR_PTR(-ENOMEM);
65
66         kref_init(&q->refcount);
67         q->flags = flags;
68         q->hwe = hwe;
69         q->gt = gt;
70         q->class = hwe->class;
71         q->width = width;
72         q->logical_mask = logical_mask;
73         q->fence_irq = &gt->fence_irq[hwe->class];
74         q->ring_ops = gt->ring_ops[hwe->class];
75         q->ops = gt->exec_queue_ops;
76         INIT_LIST_HEAD(&q->lr.link);
77         INIT_LIST_HEAD(&q->multi_gt_link);
78         INIT_LIST_HEAD(&q->hw_engine_group_link);
79
80         q->sched_props.timeslice_us = hwe->eclass->sched_props.timeslice_us;
81         q->sched_props.preempt_timeout_us =
82                                 hwe->eclass->sched_props.preempt_timeout_us;
83         q->sched_props.job_timeout_ms =
84                                 hwe->eclass->sched_props.job_timeout_ms;
85         if (q->flags & EXEC_QUEUE_FLAG_KERNEL &&
86             q->flags & EXEC_QUEUE_FLAG_HIGH_PRIORITY)
87                 q->sched_props.priority = XE_EXEC_QUEUE_PRIORITY_KERNEL;
88         else
89                 q->sched_props.priority = XE_EXEC_QUEUE_PRIORITY_NORMAL;
90
91         if (vm)
92                 q->vm = xe_vm_get(vm);
93
94         if (extensions) {
95                 /*
96                  * may set q->usm, must come before xe_lrc_create(),
97                  * may overwrite q->sched_props, must come before q->ops->init()
98                  */
99                 err = exec_queue_user_extensions(xe, q, extensions, 0);
100                 if (err) {
101                         __xe_exec_queue_free(q);
102                         return ERR_PTR(err);
103                 }
104         }
105
106         return q;
107 }
108
109 static int __xe_exec_queue_init(struct xe_exec_queue *q)
110 {
111         struct xe_vm *vm = q->vm;
112         int i, err;
113
114         if (vm) {
115                 err = xe_vm_lock(vm, true);
116                 if (err)
117                         return err;
118         }
119
120         for (i = 0; i < q->width; ++i) {
121                 q->lrc[i] = xe_lrc_create(q->hwe, q->vm, SZ_16K);
122                 if (IS_ERR(q->lrc[i])) {
123                         err = PTR_ERR(q->lrc[i]);
124                         goto err_unlock;
125                 }
126         }
127
128         if (vm)
129                 xe_vm_unlock(vm);
130
131         err = q->ops->init(q);
132         if (err)
133                 goto err_lrc;
134
135         return 0;
136
137 err_unlock:
138         if (vm)
139                 xe_vm_unlock(vm);
140 err_lrc:
141         for (i = i - 1; i >= 0; --i)
142                 xe_lrc_put(q->lrc[i]);
143         return err;
144 }
145
146 struct xe_exec_queue *xe_exec_queue_create(struct xe_device *xe, struct xe_vm *vm,
147                                            u32 logical_mask, u16 width,
148                                            struct xe_hw_engine *hwe, u32 flags,
149                                            u64 extensions)
150 {
151         struct xe_exec_queue *q;
152         int err;
153
154         q = __xe_exec_queue_alloc(xe, vm, logical_mask, width, hwe, flags,
155                                   extensions);
156         if (IS_ERR(q))
157                 return q;
158
159         err = __xe_exec_queue_init(q);
160         if (err)
161                 goto err_post_alloc;
162
163         return q;
164
165 err_post_alloc:
166         __xe_exec_queue_free(q);
167         return ERR_PTR(err);
168 }
169
170 struct xe_exec_queue *xe_exec_queue_create_class(struct xe_device *xe, struct xe_gt *gt,
171                                                  struct xe_vm *vm,
172                                                  enum xe_engine_class class,
173                                                  u32 flags, u64 extensions)
174 {
175         struct xe_hw_engine *hwe, *hwe0 = NULL;
176         enum xe_hw_engine_id id;
177         u32 logical_mask = 0;
178
179         for_each_hw_engine(hwe, gt, id) {
180                 if (xe_hw_engine_is_reserved(hwe))
181                         continue;
182
183                 if (hwe->class == class) {
184                         logical_mask |= BIT(hwe->logical_instance);
185                         if (!hwe0)
186                                 hwe0 = hwe;
187                 }
188         }
189
190         if (!logical_mask)
191                 return ERR_PTR(-ENODEV);
192
193         return xe_exec_queue_create(xe, vm, logical_mask, 1, hwe0, flags, extensions);
194 }
195
196 /**
197  * xe_exec_queue_create_bind() - Create bind exec queue.
198  * @xe: Xe device.
199  * @tile: tile which bind exec queue belongs to.
200  * @flags: exec queue creation flags
201  * @extensions: exec queue creation extensions
202  *
203  * Normalize bind exec queue creation. Bind exec queue is tied to migration VM
204  * for access to physical memory required for page table programming. On a
205  * faulting devices the reserved copy engine instance must be used to avoid
206  * deadlocking (user binds cannot get stuck behind faults as kernel binds which
207  * resolve faults depend on user binds). On non-faulting devices any copy engine
208  * can be used.
209  *
210  * Returns exec queue on success, ERR_PTR on failure
211  */
212 struct xe_exec_queue *xe_exec_queue_create_bind(struct xe_device *xe,
213                                                 struct xe_tile *tile,
214                                                 u32 flags, u64 extensions)
215 {
216         struct xe_gt *gt = tile->primary_gt;
217         struct xe_exec_queue *q;
218         struct xe_vm *migrate_vm;
219
220         migrate_vm = xe_migrate_get_vm(tile->migrate);
221         if (xe->info.has_usm) {
222                 struct xe_hw_engine *hwe = xe_gt_hw_engine(gt,
223                                                            XE_ENGINE_CLASS_COPY,
224                                                            gt->usm.reserved_bcs_instance,
225                                                            false);
226
227                 if (!hwe) {
228                         xe_vm_put(migrate_vm);
229                         return ERR_PTR(-EINVAL);
230                 }
231
232                 q = xe_exec_queue_create(xe, migrate_vm,
233                                          BIT(hwe->logical_instance), 1, hwe,
234                                          flags, extensions);
235         } else {
236                 q = xe_exec_queue_create_class(xe, gt, migrate_vm,
237                                                XE_ENGINE_CLASS_COPY, flags,
238                                                extensions);
239         }
240         xe_vm_put(migrate_vm);
241
242         return q;
243 }
244
245 void xe_exec_queue_destroy(struct kref *ref)
246 {
247         struct xe_exec_queue *q = container_of(ref, struct xe_exec_queue, refcount);
248         struct xe_exec_queue *eq, *next;
249
250         xe_exec_queue_last_fence_put_unlocked(q);
251         if (!(q->flags & EXEC_QUEUE_FLAG_BIND_ENGINE_CHILD)) {
252                 list_for_each_entry_safe(eq, next, &q->multi_gt_list,
253                                          multi_gt_link)
254                         xe_exec_queue_put(eq);
255         }
256
257         q->ops->fini(q);
258 }
259
260 void xe_exec_queue_fini(struct xe_exec_queue *q)
261 {
262         int i;
263
264         /*
265          * Before releasing our ref to lrc and xef, accumulate our run ticks
266          */
267         xe_exec_queue_update_run_ticks(q);
268
269         for (i = 0; i < q->width; ++i)
270                 xe_lrc_put(q->lrc[i]);
271
272         __xe_exec_queue_free(q);
273 }
274
275 void xe_exec_queue_assign_name(struct xe_exec_queue *q, u32 instance)
276 {
277         switch (q->class) {
278         case XE_ENGINE_CLASS_RENDER:
279                 snprintf(q->name, sizeof(q->name), "rcs%d", instance);
280                 break;
281         case XE_ENGINE_CLASS_VIDEO_DECODE:
282                 snprintf(q->name, sizeof(q->name), "vcs%d", instance);
283                 break;
284         case XE_ENGINE_CLASS_VIDEO_ENHANCE:
285                 snprintf(q->name, sizeof(q->name), "vecs%d", instance);
286                 break;
287         case XE_ENGINE_CLASS_COPY:
288                 snprintf(q->name, sizeof(q->name), "bcs%d", instance);
289                 break;
290         case XE_ENGINE_CLASS_COMPUTE:
291                 snprintf(q->name, sizeof(q->name), "ccs%d", instance);
292                 break;
293         case XE_ENGINE_CLASS_OTHER:
294                 snprintf(q->name, sizeof(q->name), "gsccs%d", instance);
295                 break;
296         default:
297                 XE_WARN_ON(q->class);
298         }
299 }
300
301 struct xe_exec_queue *xe_exec_queue_lookup(struct xe_file *xef, u32 id)
302 {
303         struct xe_exec_queue *q;
304
305         mutex_lock(&xef->exec_queue.lock);
306         q = xa_load(&xef->exec_queue.xa, id);
307         if (q)
308                 xe_exec_queue_get(q);
309         mutex_unlock(&xef->exec_queue.lock);
310
311         return q;
312 }
313
314 enum xe_exec_queue_priority
315 xe_exec_queue_device_get_max_priority(struct xe_device *xe)
316 {
317         return capable(CAP_SYS_NICE) ? XE_EXEC_QUEUE_PRIORITY_HIGH :
318                                        XE_EXEC_QUEUE_PRIORITY_NORMAL;
319 }
320
321 static int exec_queue_set_priority(struct xe_device *xe, struct xe_exec_queue *q,
322                                    u64 value)
323 {
324         if (XE_IOCTL_DBG(xe, value > XE_EXEC_QUEUE_PRIORITY_HIGH))
325                 return -EINVAL;
326
327         if (XE_IOCTL_DBG(xe, value > xe_exec_queue_device_get_max_priority(xe)))
328                 return -EPERM;
329
330         q->sched_props.priority = value;
331         return 0;
332 }
333
334 static bool xe_exec_queue_enforce_schedule_limit(void)
335 {
336 #if IS_ENABLED(CONFIG_DRM_XE_ENABLE_SCHEDTIMEOUT_LIMIT)
337         return true;
338 #else
339         return !capable(CAP_SYS_NICE);
340 #endif
341 }
342
343 static void
344 xe_exec_queue_get_prop_minmax(struct xe_hw_engine_class_intf *eclass,
345                               enum xe_exec_queue_sched_prop prop,
346                               u32 *min, u32 *max)
347 {
348         switch (prop) {
349         case XE_EXEC_QUEUE_JOB_TIMEOUT:
350                 *min = eclass->sched_props.job_timeout_min;
351                 *max = eclass->sched_props.job_timeout_max;
352                 break;
353         case XE_EXEC_QUEUE_TIMESLICE:
354                 *min = eclass->sched_props.timeslice_min;
355                 *max = eclass->sched_props.timeslice_max;
356                 break;
357         case XE_EXEC_QUEUE_PREEMPT_TIMEOUT:
358                 *min = eclass->sched_props.preempt_timeout_min;
359                 *max = eclass->sched_props.preempt_timeout_max;
360                 break;
361         default:
362                 break;
363         }
364 #if IS_ENABLED(CONFIG_DRM_XE_ENABLE_SCHEDTIMEOUT_LIMIT)
365         if (capable(CAP_SYS_NICE)) {
366                 switch (prop) {
367                 case XE_EXEC_QUEUE_JOB_TIMEOUT:
368                         *min = XE_HW_ENGINE_JOB_TIMEOUT_MIN;
369                         *max = XE_HW_ENGINE_JOB_TIMEOUT_MAX;
370                         break;
371                 case XE_EXEC_QUEUE_TIMESLICE:
372                         *min = XE_HW_ENGINE_TIMESLICE_MIN;
373                         *max = XE_HW_ENGINE_TIMESLICE_MAX;
374                         break;
375                 case XE_EXEC_QUEUE_PREEMPT_TIMEOUT:
376                         *min = XE_HW_ENGINE_PREEMPT_TIMEOUT_MIN;
377                         *max = XE_HW_ENGINE_PREEMPT_TIMEOUT_MAX;
378                         break;
379                 default:
380                         break;
381                 }
382         }
383 #endif
384 }
385
386 static int exec_queue_set_timeslice(struct xe_device *xe, struct xe_exec_queue *q,
387                                     u64 value)
388 {
389         u32 min = 0, max = 0;
390
391         xe_exec_queue_get_prop_minmax(q->hwe->eclass,
392                                       XE_EXEC_QUEUE_TIMESLICE, &min, &max);
393
394         if (xe_exec_queue_enforce_schedule_limit() &&
395             !xe_hw_engine_timeout_in_range(value, min, max))
396                 return -EINVAL;
397
398         q->sched_props.timeslice_us = value;
399         return 0;
400 }
401
402 typedef int (*xe_exec_queue_set_property_fn)(struct xe_device *xe,
403                                              struct xe_exec_queue *q,
404                                              u64 value);
405
406 static const xe_exec_queue_set_property_fn exec_queue_set_property_funcs[] = {
407         [DRM_XE_EXEC_QUEUE_SET_PROPERTY_PRIORITY] = exec_queue_set_priority,
408         [DRM_XE_EXEC_QUEUE_SET_PROPERTY_TIMESLICE] = exec_queue_set_timeslice,
409 };
410
411 static int exec_queue_user_ext_set_property(struct xe_device *xe,
412                                             struct xe_exec_queue *q,
413                                             u64 extension)
414 {
415         u64 __user *address = u64_to_user_ptr(extension);
416         struct drm_xe_ext_set_property ext;
417         int err;
418         u32 idx;
419
420         err = __copy_from_user(&ext, address, sizeof(ext));
421         if (XE_IOCTL_DBG(xe, err))
422                 return -EFAULT;
423
424         if (XE_IOCTL_DBG(xe, ext.property >=
425                          ARRAY_SIZE(exec_queue_set_property_funcs)) ||
426             XE_IOCTL_DBG(xe, ext.pad) ||
427             XE_IOCTL_DBG(xe, ext.property != DRM_XE_EXEC_QUEUE_SET_PROPERTY_PRIORITY &&
428                          ext.property != DRM_XE_EXEC_QUEUE_SET_PROPERTY_TIMESLICE))
429                 return -EINVAL;
430
431         idx = array_index_nospec(ext.property, ARRAY_SIZE(exec_queue_set_property_funcs));
432         if (!exec_queue_set_property_funcs[idx])
433                 return -EINVAL;
434
435         return exec_queue_set_property_funcs[idx](xe, q, ext.value);
436 }
437
438 typedef int (*xe_exec_queue_user_extension_fn)(struct xe_device *xe,
439                                                struct xe_exec_queue *q,
440                                                u64 extension);
441
442 static const xe_exec_queue_user_extension_fn exec_queue_user_extension_funcs[] = {
443         [DRM_XE_EXEC_QUEUE_EXTENSION_SET_PROPERTY] = exec_queue_user_ext_set_property,
444 };
445
446 #define MAX_USER_EXTENSIONS     16
447 static int exec_queue_user_extensions(struct xe_device *xe, struct xe_exec_queue *q,
448                                       u64 extensions, int ext_number)
449 {
450         u64 __user *address = u64_to_user_ptr(extensions);
451         struct drm_xe_user_extension ext;
452         int err;
453         u32 idx;
454
455         if (XE_IOCTL_DBG(xe, ext_number >= MAX_USER_EXTENSIONS))
456                 return -E2BIG;
457
458         err = __copy_from_user(&ext, address, sizeof(ext));
459         if (XE_IOCTL_DBG(xe, err))
460                 return -EFAULT;
461
462         if (XE_IOCTL_DBG(xe, ext.pad) ||
463             XE_IOCTL_DBG(xe, ext.name >=
464                          ARRAY_SIZE(exec_queue_user_extension_funcs)))
465                 return -EINVAL;
466
467         idx = array_index_nospec(ext.name,
468                                  ARRAY_SIZE(exec_queue_user_extension_funcs));
469         err = exec_queue_user_extension_funcs[idx](xe, q, extensions);
470         if (XE_IOCTL_DBG(xe, err))
471                 return err;
472
473         if (ext.next_extension)
474                 return exec_queue_user_extensions(xe, q, ext.next_extension,
475                                                   ++ext_number);
476
477         return 0;
478 }
479
480 static u32 calc_validate_logical_mask(struct xe_device *xe, struct xe_gt *gt,
481                                       struct drm_xe_engine_class_instance *eci,
482                                       u16 width, u16 num_placements)
483 {
484         int len = width * num_placements;
485         int i, j, n;
486         u16 class;
487         u16 gt_id;
488         u32 return_mask = 0, prev_mask;
489
490         if (XE_IOCTL_DBG(xe, !xe_device_uc_enabled(xe) &&
491                          len > 1))
492                 return 0;
493
494         for (i = 0; i < width; ++i) {
495                 u32 current_mask = 0;
496
497                 for (j = 0; j < num_placements; ++j) {
498                         struct xe_hw_engine *hwe;
499
500                         n = j * width + i;
501
502                         hwe = xe_hw_engine_lookup(xe, eci[n]);
503                         if (XE_IOCTL_DBG(xe, !hwe))
504                                 return 0;
505
506                         if (XE_IOCTL_DBG(xe, xe_hw_engine_is_reserved(hwe)))
507                                 return 0;
508
509                         if (XE_IOCTL_DBG(xe, n && eci[n].gt_id != gt_id) ||
510                             XE_IOCTL_DBG(xe, n && eci[n].engine_class != class))
511                                 return 0;
512
513                         class = eci[n].engine_class;
514                         gt_id = eci[n].gt_id;
515
516                         if (width == 1 || !i)
517                                 return_mask |= BIT(eci[n].engine_instance);
518                         current_mask |= BIT(eci[n].engine_instance);
519                 }
520
521                 /* Parallel submissions must be logically contiguous */
522                 if (i && XE_IOCTL_DBG(xe, current_mask != prev_mask << 1))
523                         return 0;
524
525                 prev_mask = current_mask;
526         }
527
528         return return_mask;
529 }
530
531 int xe_exec_queue_create_ioctl(struct drm_device *dev, void *data,
532                                struct drm_file *file)
533 {
534         struct xe_device *xe = to_xe_device(dev);
535         struct xe_file *xef = to_xe_file(file);
536         struct drm_xe_exec_queue_create *args = data;
537         struct drm_xe_engine_class_instance eci[XE_HW_ENGINE_MAX_INSTANCE];
538         struct drm_xe_engine_class_instance __user *user_eci =
539                 u64_to_user_ptr(args->instances);
540         struct xe_hw_engine *hwe;
541         struct xe_vm *vm;
542         struct xe_gt *gt;
543         struct xe_tile *tile;
544         struct xe_exec_queue *q = NULL;
545         u32 logical_mask;
546         u32 id;
547         u32 len;
548         int err;
549
550         if (XE_IOCTL_DBG(xe, args->flags) ||
551             XE_IOCTL_DBG(xe, args->reserved[0] || args->reserved[1]))
552                 return -EINVAL;
553
554         len = args->width * args->num_placements;
555         if (XE_IOCTL_DBG(xe, !len || len > XE_HW_ENGINE_MAX_INSTANCE))
556                 return -EINVAL;
557
558         err = __copy_from_user(eci, user_eci,
559                                sizeof(struct drm_xe_engine_class_instance) *
560                                len);
561         if (XE_IOCTL_DBG(xe, err))
562                 return -EFAULT;
563
564         if (XE_IOCTL_DBG(xe, eci[0].gt_id >= xe->info.gt_count))
565                 return -EINVAL;
566
567         if (eci[0].engine_class == DRM_XE_ENGINE_CLASS_VM_BIND) {
568                 if (XE_IOCTL_DBG(xe, args->width != 1) ||
569                     XE_IOCTL_DBG(xe, args->num_placements != 1) ||
570                     XE_IOCTL_DBG(xe, eci[0].engine_instance != 0))
571                         return -EINVAL;
572
573                 for_each_tile(tile, xe, id) {
574                         struct xe_exec_queue *new;
575                         u32 flags = EXEC_QUEUE_FLAG_VM;
576
577                         if (id)
578                                 flags |= EXEC_QUEUE_FLAG_BIND_ENGINE_CHILD;
579
580                         new = xe_exec_queue_create_bind(xe, tile, flags,
581                                                         args->extensions);
582                         if (IS_ERR(new)) {
583                                 err = PTR_ERR(new);
584                                 if (q)
585                                         goto put_exec_queue;
586                                 return err;
587                         }
588                         if (id == 0)
589                                 q = new;
590                         else
591                                 list_add_tail(&new->multi_gt_list,
592                                               &q->multi_gt_link);
593                 }
594         } else {
595                 gt = xe_device_get_gt(xe, eci[0].gt_id);
596                 logical_mask = calc_validate_logical_mask(xe, gt, eci,
597                                                           args->width,
598                                                           args->num_placements);
599                 if (XE_IOCTL_DBG(xe, !logical_mask))
600                         return -EINVAL;
601
602                 hwe = xe_hw_engine_lookup(xe, eci[0]);
603                 if (XE_IOCTL_DBG(xe, !hwe))
604                         return -EINVAL;
605
606                 vm = xe_vm_lookup(xef, args->vm_id);
607                 if (XE_IOCTL_DBG(xe, !vm))
608                         return -ENOENT;
609
610                 err = down_read_interruptible(&vm->lock);
611                 if (err) {
612                         xe_vm_put(vm);
613                         return err;
614                 }
615
616                 if (XE_IOCTL_DBG(xe, xe_vm_is_closed_or_banned(vm))) {
617                         up_read(&vm->lock);
618                         xe_vm_put(vm);
619                         return -ENOENT;
620                 }
621
622                 q = xe_exec_queue_create(xe, vm, logical_mask,
623                                          args->width, hwe, 0,
624                                          args->extensions);
625                 up_read(&vm->lock);
626                 xe_vm_put(vm);
627                 if (IS_ERR(q))
628                         return PTR_ERR(q);
629
630                 if (xe_vm_in_preempt_fence_mode(vm)) {
631                         q->lr.context = dma_fence_context_alloc(1);
632
633                         err = xe_vm_add_compute_exec_queue(vm, q);
634                         if (XE_IOCTL_DBG(xe, err))
635                                 goto put_exec_queue;
636                 }
637
638                 if (q->vm && q->hwe->hw_engine_group) {
639                         err = xe_hw_engine_group_add_exec_queue(q->hwe->hw_engine_group, q);
640                         if (err)
641                                 goto put_exec_queue;
642                 }
643         }
644
645         q->xef = xe_file_get(xef);
646
647         /* user id alloc must always be last in ioctl to prevent UAF */
648         err = xa_alloc(&xef->exec_queue.xa, &id, q, xa_limit_32b, GFP_KERNEL);
649         if (err)
650                 goto kill_exec_queue;
651
652         args->exec_queue_id = id;
653
654         return 0;
655
656 kill_exec_queue:
657         xe_exec_queue_kill(q);
658 put_exec_queue:
659         xe_exec_queue_put(q);
660         return err;
661 }
662
663 int xe_exec_queue_get_property_ioctl(struct drm_device *dev, void *data,
664                                      struct drm_file *file)
665 {
666         struct xe_device *xe = to_xe_device(dev);
667         struct xe_file *xef = to_xe_file(file);
668         struct drm_xe_exec_queue_get_property *args = data;
669         struct xe_exec_queue *q;
670         int ret;
671
672         if (XE_IOCTL_DBG(xe, args->reserved[0] || args->reserved[1]))
673                 return -EINVAL;
674
675         q = xe_exec_queue_lookup(xef, args->exec_queue_id);
676         if (XE_IOCTL_DBG(xe, !q))
677                 return -ENOENT;
678
679         switch (args->property) {
680         case DRM_XE_EXEC_QUEUE_GET_PROPERTY_BAN:
681                 args->value = q->ops->reset_status(q);
682                 ret = 0;
683                 break;
684         default:
685                 ret = -EINVAL;
686         }
687
688         xe_exec_queue_put(q);
689
690         return ret;
691 }
692
693 /**
694  * xe_exec_queue_is_lr() - Whether an exec_queue is long-running
695  * @q: The exec_queue
696  *
697  * Return: True if the exec_queue is long-running, false otherwise.
698  */
699 bool xe_exec_queue_is_lr(struct xe_exec_queue *q)
700 {
701         return q->vm && xe_vm_in_lr_mode(q->vm) &&
702                 !(q->flags & EXEC_QUEUE_FLAG_VM);
703 }
704
705 static s32 xe_exec_queue_num_job_inflight(struct xe_exec_queue *q)
706 {
707         return q->lrc[0]->fence_ctx.next_seqno - xe_lrc_seqno(q->lrc[0]) - 1;
708 }
709
710 /**
711  * xe_exec_queue_ring_full() - Whether an exec_queue's ring is full
712  * @q: The exec_queue
713  *
714  * Return: True if the exec_queue's ring is full, false otherwise.
715  */
716 bool xe_exec_queue_ring_full(struct xe_exec_queue *q)
717 {
718         struct xe_lrc *lrc = q->lrc[0];
719         s32 max_job = lrc->ring.size / MAX_JOB_SIZE_BYTES;
720
721         return xe_exec_queue_num_job_inflight(q) >= max_job;
722 }
723
724 /**
725  * xe_exec_queue_is_idle() - Whether an exec_queue is idle.
726  * @q: The exec_queue
727  *
728  * FIXME: Need to determine what to use as the short-lived
729  * timeline lock for the exec_queues, so that the return value
730  * of this function becomes more than just an advisory
731  * snapshot in time. The timeline lock must protect the
732  * seqno from racing submissions on the same exec_queue.
733  * Typically vm->resv, but user-created timeline locks use the migrate vm
734  * and never grabs the migrate vm->resv so we have a race there.
735  *
736  * Return: True if the exec_queue is idle, false otherwise.
737  */
738 bool xe_exec_queue_is_idle(struct xe_exec_queue *q)
739 {
740         if (xe_exec_queue_is_parallel(q)) {
741                 int i;
742
743                 for (i = 0; i < q->width; ++i) {
744                         if (xe_lrc_seqno(q->lrc[i]) !=
745                             q->lrc[i]->fence_ctx.next_seqno - 1)
746                                 return false;
747                 }
748
749                 return true;
750         }
751
752         return xe_lrc_seqno(q->lrc[0]) ==
753                 q->lrc[0]->fence_ctx.next_seqno - 1;
754 }
755
756 /**
757  * xe_exec_queue_update_run_ticks() - Update run time in ticks for this exec queue
758  * from hw
759  * @q: The exec queue
760  *
761  * Update the timestamp saved by HW for this exec queue and save run ticks
762  * calculated by using the delta from last update.
763  */
764 void xe_exec_queue_update_run_ticks(struct xe_exec_queue *q)
765 {
766         struct xe_device *xe = gt_to_xe(q->gt);
767         struct xe_file *xef;
768         struct xe_lrc *lrc;
769         u32 old_ts, new_ts;
770         int idx;
771
772         /*
773          * Jobs that are run during driver load may use an exec_queue, but are
774          * not associated with a user xe file, so avoid accumulating busyness
775          * for kernel specific work.
776          */
777         if (!q->vm || !q->vm->xef)
778                 return;
779
780         /* Synchronize with unbind while holding the xe file open */
781         if (!drm_dev_enter(&xe->drm, &idx))
782                 return;
783
784         xef = q->vm->xef;
785
786         /*
787          * Only sample the first LRC. For parallel submission, all of them are
788          * scheduled together and we compensate that below by multiplying by
789          * width - this may introduce errors if that premise is not true and
790          * they don't exit 100% aligned. On the other hand, looping through
791          * the LRCs and reading them in different time could also introduce
792          * errors.
793          */
794         lrc = q->lrc[0];
795         new_ts = xe_lrc_update_timestamp(lrc, &old_ts);
796         xef->run_ticks[q->class] += (new_ts - old_ts) * q->width;
797
798         drm_dev_exit(idx);
799 }
800
801 /**
802  * xe_exec_queue_kill - permanently stop all execution from an exec queue
803  * @q: The exec queue
804  *
805  * This function permanently stops all activity on an exec queue. If the queue
806  * is actively executing on the HW, it will be kicked off the engine; any
807  * pending jobs are discarded and all future submissions are rejected.
808  * This function is safe to call multiple times.
809  */
810 void xe_exec_queue_kill(struct xe_exec_queue *q)
811 {
812         struct xe_exec_queue *eq = q, *next;
813
814         list_for_each_entry_safe(eq, next, &eq->multi_gt_list,
815                                  multi_gt_link) {
816                 q->ops->kill(eq);
817                 xe_vm_remove_compute_exec_queue(q->vm, eq);
818         }
819
820         q->ops->kill(q);
821         xe_vm_remove_compute_exec_queue(q->vm, q);
822 }
823
824 int xe_exec_queue_destroy_ioctl(struct drm_device *dev, void *data,
825                                 struct drm_file *file)
826 {
827         struct xe_device *xe = to_xe_device(dev);
828         struct xe_file *xef = to_xe_file(file);
829         struct drm_xe_exec_queue_destroy *args = data;
830         struct xe_exec_queue *q;
831
832         if (XE_IOCTL_DBG(xe, args->pad) ||
833             XE_IOCTL_DBG(xe, args->reserved[0] || args->reserved[1]))
834                 return -EINVAL;
835
836         mutex_lock(&xef->exec_queue.lock);
837         q = xa_erase(&xef->exec_queue.xa, args->exec_queue_id);
838         mutex_unlock(&xef->exec_queue.lock);
839         if (XE_IOCTL_DBG(xe, !q))
840                 return -ENOENT;
841
842         if (q->vm && q->hwe->hw_engine_group)
843                 xe_hw_engine_group_del_exec_queue(q->hwe->hw_engine_group, q);
844
845         xe_exec_queue_kill(q);
846
847         trace_xe_exec_queue_close(q);
848         xe_exec_queue_put(q);
849
850         return 0;
851 }
852
853 static void xe_exec_queue_last_fence_lockdep_assert(struct xe_exec_queue *q,
854                                                     struct xe_vm *vm)
855 {
856         if (q->flags & EXEC_QUEUE_FLAG_VM) {
857                 lockdep_assert_held(&vm->lock);
858         } else {
859                 xe_vm_assert_held(vm);
860                 lockdep_assert_held(&q->hwe->hw_engine_group->mode_sem);
861         }
862 }
863
864 /**
865  * xe_exec_queue_last_fence_put() - Drop ref to last fence
866  * @q: The exec queue
867  * @vm: The VM the engine does a bind or exec for
868  */
869 void xe_exec_queue_last_fence_put(struct xe_exec_queue *q, struct xe_vm *vm)
870 {
871         xe_exec_queue_last_fence_lockdep_assert(q, vm);
872
873         xe_exec_queue_last_fence_put_unlocked(q);
874 }
875
876 /**
877  * xe_exec_queue_last_fence_put_unlocked() - Drop ref to last fence unlocked
878  * @q: The exec queue
879  *
880  * Only safe to be called from xe_exec_queue_destroy().
881  */
882 void xe_exec_queue_last_fence_put_unlocked(struct xe_exec_queue *q)
883 {
884         if (q->last_fence) {
885                 dma_fence_put(q->last_fence);
886                 q->last_fence = NULL;
887         }
888 }
889
890 /**
891  * xe_exec_queue_last_fence_get() - Get last fence
892  * @q: The exec queue
893  * @vm: The VM the engine does a bind or exec for
894  *
895  * Get last fence, takes a ref
896  *
897  * Returns: last fence if not signaled, dma fence stub if signaled
898  */
899 struct dma_fence *xe_exec_queue_last_fence_get(struct xe_exec_queue *q,
900                                                struct xe_vm *vm)
901 {
902         struct dma_fence *fence;
903
904         xe_exec_queue_last_fence_lockdep_assert(q, vm);
905
906         if (q->last_fence &&
907             test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &q->last_fence->flags))
908                 xe_exec_queue_last_fence_put(q, vm);
909
910         fence = q->last_fence ? q->last_fence : dma_fence_get_stub();
911         dma_fence_get(fence);
912         return fence;
913 }
914
915 /**
916  * xe_exec_queue_last_fence_get_for_resume() - Get last fence
917  * @q: The exec queue
918  * @vm: The VM the engine does a bind or exec for
919  *
920  * Get last fence, takes a ref. Only safe to be called in the context of
921  * resuming the hw engine group's long-running exec queue, when the group
922  * semaphore is held.
923  *
924  * Returns: last fence if not signaled, dma fence stub if signaled
925  */
926 struct dma_fence *xe_exec_queue_last_fence_get_for_resume(struct xe_exec_queue *q,
927                                                           struct xe_vm *vm)
928 {
929         struct dma_fence *fence;
930
931         lockdep_assert_held_write(&q->hwe->hw_engine_group->mode_sem);
932
933         if (q->last_fence &&
934             test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &q->last_fence->flags))
935                 xe_exec_queue_last_fence_put_unlocked(q);
936
937         fence = q->last_fence ? q->last_fence : dma_fence_get_stub();
938         dma_fence_get(fence);
939         return fence;
940 }
941
942 /**
943  * xe_exec_queue_last_fence_set() - Set last fence
944  * @q: The exec queue
945  * @vm: The VM the engine does a bind or exec for
946  * @fence: The fence
947  *
948  * Set the last fence for the engine. Increases reference count for fence, when
949  * closing engine xe_exec_queue_last_fence_put should be called.
950  */
951 void xe_exec_queue_last_fence_set(struct xe_exec_queue *q, struct xe_vm *vm,
952                                   struct dma_fence *fence)
953 {
954         xe_exec_queue_last_fence_lockdep_assert(q, vm);
955
956         xe_exec_queue_last_fence_put(q, vm);
957         q->last_fence = dma_fence_get(fence);
958 }
959
960 /**
961  * xe_exec_queue_last_fence_test_dep - Test last fence dependency of queue
962  * @q: The exec queue
963  * @vm: The VM the engine does a bind or exec for
964  *
965  * Returns:
966  * -ETIME if there exists an unsignalled last fence dependency, zero otherwise.
967  */
968 int xe_exec_queue_last_fence_test_dep(struct xe_exec_queue *q, struct xe_vm *vm)
969 {
970         struct dma_fence *fence;
971         int err = 0;
972
973         fence = xe_exec_queue_last_fence_get(q, vm);
974         if (fence) {
975                 err = test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags) ?
976                         0 : -ETIME;
977                 dma_fence_put(fence);
978         }
979
980         return err;
981 }
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