1/* SPDX-License-Identifier: MIT */
2/*
3 * Copyright © 2019 Intel Corporation
4 */
5
6#ifndef __INTEL_CONTEXT_H__
7#define __INTEL_CONTEXT_H__
8
9#include <linux/bitops.h>
10#include <linux/lockdep.h>
11#include <linux/types.h>
12
13#include "i915_active.h"
14#include "i915_drv.h"
15#include "intel_context_types.h"
16#include "intel_engine_types.h"
17#include "intel_gt_pm.h"
18#include "intel_ring_types.h"
19#include "intel_timeline_types.h"
20#include "i915_trace.h"
21
22#define CE_TRACE(ce, fmt, ...) do { \
23 const struct intel_context *ce__ = (ce); \
24 ENGINE_TRACE(ce__->engine, "context:%llx " fmt, \
25 ce__->timeline->fence_context, \
26 ##__VA_ARGS__); \
27} while (0)
28
29#define INTEL_CONTEXT_BANNED_PREEMPT_TIMEOUT_MS (1)
30
31struct i915_gem_ww_ctx;
32
33void intel_context_init(struct intel_context *ce,
34 struct intel_engine_cs *engine);
35void intel_context_fini(struct intel_context *ce);
36
37void i915_context_module_exit(void);
38int i915_context_module_init(void);
39
40struct intel_context *
41intel_context_create(struct intel_engine_cs *engine);
42
43int intel_context_alloc_state(struct intel_context *ce);
44
45void intel_context_free(struct intel_context *ce);
46
47int intel_context_reconfigure_sseu(struct intel_context *ce,
48 const struct intel_sseu sseu);
49
50#define PARENT_SCRATCH_SIZE PAGE_SIZE
51
52static inline bool intel_context_is_child(struct intel_context *ce)
53{
54 return !!ce->parallel.parent;
55}
56
57static inline bool intel_context_is_parent(struct intel_context *ce)
58{
59 return !!ce->parallel.number_children;
60}
61
62static inline bool intel_context_is_pinned(struct intel_context *ce);
63
64static inline struct intel_context *
65intel_context_to_parent(struct intel_context *ce)
66{
67 if (intel_context_is_child(ce)) {
68 /*
69 * The parent holds ref count to the child so it is always safe
70 * for the parent to access the child, but the child has a
71 * pointer to the parent without a ref. To ensure this is safe
72 * the child should only access the parent pointer while the
73 * parent is pinned.
74 */
75 GEM_BUG_ON(!intel_context_is_pinned(ce->parallel.parent));
76
77 return ce->parallel.parent;
78 } else {
79 return ce;
80 }
81}
82
83static inline bool intel_context_is_parallel(struct intel_context *ce)
84{
85 return intel_context_is_child(ce) || intel_context_is_parent(ce);
86}
87
88void intel_context_bind_parent_child(struct intel_context *parent,
89 struct intel_context *child);
90
91#define for_each_child(parent, ce)\
92 list_for_each_entry(ce, &(parent)->parallel.child_list,\
93 parallel.child_link)
94#define for_each_child_safe(parent, ce, cn)\
95 list_for_each_entry_safe(ce, cn, &(parent)->parallel.child_list,\
96 parallel.child_link)
97
98/**
99 * intel_context_lock_pinned - Stablises the 'pinned' status of the HW context
100 * @ce: the context
101 *
102 * Acquire a lock on the pinned status of the HW context, such that the context
103 * can neither be bound to the GPU or unbound whilst the lock is held, i.e.
104 * intel_context_is_pinned() remains stable.
105 */
106static inline int intel_context_lock_pinned(struct intel_context *ce)
107 __acquires(ce->pin_mutex)
108{
109 return mutex_lock_interruptible(&ce->pin_mutex);
110}
111
112/**
113 * intel_context_is_pinned - Reports the 'pinned' status
114 * @ce: the context
115 *
116 * While in use by the GPU, the context, along with its ring and page
117 * tables is pinned into memory and the GTT.
118 *
119 * Returns: true if the context is currently pinned for use by the GPU.
120 */
121static inline bool
122intel_context_is_pinned(struct intel_context *ce)
123{
124 return atomic_read(v: &ce->pin_count);
125}
126
127static inline void intel_context_cancel_request(struct intel_context *ce,
128 struct i915_request *rq)
129{
130 GEM_BUG_ON(!ce->ops->cancel_request);
131 return ce->ops->cancel_request(ce, rq);
132}
133
134/**
135 * intel_context_unlock_pinned - Releases the earlier locking of 'pinned' status
136 * @ce: the context
137 *
138 * Releases the lock earlier acquired by intel_context_unlock_pinned().
139 */
140static inline void intel_context_unlock_pinned(struct intel_context *ce)
141 __releases(ce->pin_mutex)
142{
143 mutex_unlock(lock: &ce->pin_mutex);
144}
145
146int __intel_context_do_pin(struct intel_context *ce);
147int __intel_context_do_pin_ww(struct intel_context *ce,
148 struct i915_gem_ww_ctx *ww);
149
150static inline bool intel_context_pin_if_active(struct intel_context *ce)
151{
152 return atomic_inc_not_zero(v: &ce->pin_count);
153}
154
155static inline int intel_context_pin(struct intel_context *ce)
156{
157 if (likely(intel_context_pin_if_active(ce)))
158 return 0;
159
160 return __intel_context_do_pin(ce);
161}
162
163static inline int intel_context_pin_ww(struct intel_context *ce,
164 struct i915_gem_ww_ctx *ww)
165{
166 if (likely(intel_context_pin_if_active(ce)))
167 return 0;
168
169 return __intel_context_do_pin_ww(ce, ww);
170}
171
172static inline void __intel_context_pin(struct intel_context *ce)
173{
174 GEM_BUG_ON(!intel_context_is_pinned(ce));
175 atomic_inc(v: &ce->pin_count);
176}
177
178void __intel_context_do_unpin(struct intel_context *ce, int sub);
179
180static inline void intel_context_sched_disable_unpin(struct intel_context *ce)
181{
182 __intel_context_do_unpin(ce, sub: 2);
183}
184
185static inline void intel_context_unpin(struct intel_context *ce)
186{
187 if (!ce->ops->sched_disable) {
188 __intel_context_do_unpin(ce, sub: 1);
189 } else {
190 /*
191 * Move ownership of this pin to the scheduling disable which is
192 * an async operation. When that operation completes the above
193 * intel_context_sched_disable_unpin is called potentially
194 * unpinning the context.
195 */
196 while (!atomic_add_unless(v: &ce->pin_count, a: -1, u: 1)) {
197 if (atomic_cmpxchg(v: &ce->pin_count, old: 1, new: 2) == 1) {
198 ce->ops->sched_disable(ce);
199 break;
200 }
201 }
202 }
203}
204
205void intel_context_enter_engine(struct intel_context *ce);
206void intel_context_exit_engine(struct intel_context *ce);
207
208static inline void intel_context_enter(struct intel_context *ce)
209{
210 lockdep_assert_held(&ce->timeline->mutex);
211 if (ce->active_count++)
212 return;
213
214 ce->ops->enter(ce);
215 ce->wakeref = intel_gt_pm_get(gt: ce->vm->gt);
216}
217
218static inline void intel_context_mark_active(struct intel_context *ce)
219{
220 lockdep_assert(lockdep_is_held(&ce->timeline->mutex) ||
221 test_bit(CONTEXT_IS_PARKING, &ce->flags));
222 ++ce->active_count;
223}
224
225static inline void intel_context_exit(struct intel_context *ce)
226{
227 lockdep_assert_held(&ce->timeline->mutex);
228 GEM_BUG_ON(!ce->active_count);
229 if (--ce->active_count)
230 return;
231
232 intel_gt_pm_put_async(gt: ce->vm->gt, handle: ce->wakeref);
233 ce->ops->exit(ce);
234}
235
236static inline struct intel_context *intel_context_get(struct intel_context *ce)
237{
238 kref_get(kref: &ce->ref);
239 return ce;
240}
241
242static inline void intel_context_put(struct intel_context *ce)
243{
244 kref_put(kref: &ce->ref, release: ce->ops->destroy);
245}
246
247static inline struct intel_timeline *__must_check
248intel_context_timeline_lock(struct intel_context *ce)
249 __acquires(&ce->timeline->mutex)
250{
251 struct intel_timeline *tl = ce->timeline;
252 int err;
253
254 if (intel_context_is_parent(ce))
255 err = mutex_lock_interruptible_nested(lock: &tl->mutex, subclass: 0);
256 else if (intel_context_is_child(ce))
257 err = mutex_lock_interruptible_nested(lock: &tl->mutex,
258 subclass: ce->parallel.child_index + 1);
259 else
260 err = mutex_lock_interruptible(&tl->mutex);
261 if (err)
262 return ERR_PTR(error: err);
263
264 return tl;
265}
266
267static inline void intel_context_timeline_unlock(struct intel_timeline *tl)
268 __releases(&tl->mutex)
269{
270 mutex_unlock(lock: &tl->mutex);
271}
272
273int intel_context_prepare_remote_request(struct intel_context *ce,
274 struct i915_request *rq);
275
276struct i915_request *intel_context_create_request(struct intel_context *ce);
277
278struct i915_request *intel_context_get_active_request(struct intel_context *ce);
279
280static inline bool intel_context_is_barrier(const struct intel_context *ce)
281{
282 return test_bit(CONTEXT_BARRIER_BIT, &ce->flags);
283}
284
285static inline void intel_context_close(struct intel_context *ce)
286{
287 set_bit(CONTEXT_CLOSED_BIT, addr: &ce->flags);
288
289 if (ce->ops->close)
290 ce->ops->close(ce);
291}
292
293static inline bool intel_context_is_closed(const struct intel_context *ce)
294{
295 return test_bit(CONTEXT_CLOSED_BIT, &ce->flags);
296}
297
298static inline bool intel_context_has_inflight(const struct intel_context *ce)
299{
300 return test_bit(COPS_HAS_INFLIGHT_BIT, &ce->ops->flags);
301}
302
303static inline bool intel_context_use_semaphores(const struct intel_context *ce)
304{
305 return test_bit(CONTEXT_USE_SEMAPHORES, &ce->flags);
306}
307
308static inline void intel_context_set_use_semaphores(struct intel_context *ce)
309{
310 set_bit(CONTEXT_USE_SEMAPHORES, addr: &ce->flags);
311}
312
313static inline void intel_context_clear_use_semaphores(struct intel_context *ce)
314{
315 clear_bit(CONTEXT_USE_SEMAPHORES, addr: &ce->flags);
316}
317
318static inline bool intel_context_is_banned(const struct intel_context *ce)
319{
320 return test_bit(CONTEXT_BANNED, &ce->flags);
321}
322
323static inline bool intel_context_set_banned(struct intel_context *ce)
324{
325 return test_and_set_bit(CONTEXT_BANNED, addr: &ce->flags);
326}
327
328bool intel_context_ban(struct intel_context *ce, struct i915_request *rq);
329
330static inline bool intel_context_is_schedulable(const struct intel_context *ce)
331{
332 return !test_bit(CONTEXT_EXITING, &ce->flags) &&
333 !test_bit(CONTEXT_BANNED, &ce->flags);
334}
335
336static inline bool intel_context_is_exiting(const struct intel_context *ce)
337{
338 return test_bit(CONTEXT_EXITING, &ce->flags);
339}
340
341static inline bool intel_context_set_exiting(struct intel_context *ce)
342{
343 return test_and_set_bit(CONTEXT_EXITING, addr: &ce->flags);
344}
345
346bool intel_context_revoke(struct intel_context *ce);
347
348static inline bool
349intel_context_force_single_submission(const struct intel_context *ce)
350{
351 return test_bit(CONTEXT_FORCE_SINGLE_SUBMISSION, &ce->flags);
352}
353
354static inline void
355intel_context_set_single_submission(struct intel_context *ce)
356{
357 __set_bit(CONTEXT_FORCE_SINGLE_SUBMISSION, &ce->flags);
358}
359
360static inline bool
361intel_context_nopreempt(const struct intel_context *ce)
362{
363 return test_bit(CONTEXT_NOPREEMPT, &ce->flags);
364}
365
366static inline void
367intel_context_set_nopreempt(struct intel_context *ce)
368{
369 set_bit(CONTEXT_NOPREEMPT, addr: &ce->flags);
370}
371
372static inline void
373intel_context_clear_nopreempt(struct intel_context *ce)
374{
375 clear_bit(CONTEXT_NOPREEMPT, addr: &ce->flags);
376}
377
378#if IS_ENABLED(CONFIG_DRM_I915_REPLAY_GPU_HANGS_API)
379static inline bool intel_context_has_own_state(const struct intel_context *ce)
380{
381 return test_bit(CONTEXT_OWN_STATE, &ce->flags);
382}
383
384static inline bool intel_context_set_own_state(struct intel_context *ce)
385{
386 return test_and_set_bit(CONTEXT_OWN_STATE, addr: &ce->flags);
387}
388#else
389static inline bool intel_context_has_own_state(const struct intel_context *ce)
390{
391 return false;
392}
393
394static inline bool intel_context_set_own_state(struct intel_context *ce)
395{
396 return true;
397}
398#endif
399
400u64 intel_context_get_total_runtime_ns(struct intel_context *ce);
401u64 intel_context_get_avg_runtime_ns(struct intel_context *ce);
402
403static inline u64 intel_context_clock(void)
404{
405 /* As we mix CS cycles with CPU clocks, use the raw monotonic clock. */
406 return ktime_get_raw_fast_ns();
407}
408
409#endif /* __INTEL_CONTEXT_H__ */
410

source code of linux/drivers/gpu/drm/i915/gt/intel_context.h