[linux-2.6-block.git] / drivers / gpu / drm / i915 / gt / intel_context.c

/*
 * SPDX-License-Identifier: MIT
 *
 * Copyright © 2019 Intel Corporation
 */

#include "gem/i915_gem_context.h"
#include "gem/i915_gem_pm.h"

#include "i915_drv.h"
#include "i915_globals.h"

#include "intel_context.h"
#include "intel_engine.h"
#include "intel_engine_pm.h"
#include "intel_ring.h"

static struct i915_global_context {
	struct i915_global base;
	struct kmem_cache *slab_ce;
} global;

static struct intel_context *intel_context_alloc(void)
{
	return kmem_cache_zalloc(global.slab_ce, GFP_KERNEL);
}

void intel_context_free(struct intel_context *ce)
{
	kmem_cache_free(global.slab_ce, ce);
}

struct intel_context *
intel_context_create(struct intel_engine_cs *engine)
{
	struct intel_context *ce;

	ce = intel_context_alloc();
	if (!ce)
		return ERR_PTR(-ENOMEM);

	intel_context_init(ce, engine);
	return ce;
}

int intel_context_alloc_state(struct intel_context *ce)
{
	int err = 0;

	if (mutex_lock_interruptible(&ce->pin_mutex))
		return -EINTR;

	if (!test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
		if (intel_context_is_banned(ce)) {
			err = -EIO;
			goto unlock;
		}

		err = ce->ops->alloc(ce);
		if (unlikely(err))
			goto unlock;

		set_bit(CONTEXT_ALLOC_BIT, &ce->flags);
	}

unlock:
	mutex_unlock(&ce->pin_mutex);
	return err;
}

static int intel_context_active_acquire(struct intel_context *ce)
{
	int err;

	__i915_active_acquire(&ce->active);

	if (intel_context_is_barrier(ce))
		return 0;

	/* Preallocate tracking nodes */
	err = i915_active_acquire_preallocate_barrier(&ce->active,
						      ce->engine);
	if (err)
		i915_active_release(&ce->active);

	return err;
}

static void intel_context_active_release(struct intel_context *ce)
{
	/* Nodes preallocated in intel_context_active() */
	i915_active_acquire_barrier(&ce->active);
	i915_active_release(&ce->active);
}

static int __context_pin_state(struct i915_vma *vma, struct i915_gem_ww_ctx *ww)
{
	unsigned int bias = i915_ggtt_pin_bias(vma) | PIN_OFFSET_BIAS;
	int err;

	err = i915_ggtt_pin(vma, ww, 0, bias | PIN_HIGH);
	if (err)
		return err;

	err = i915_active_acquire(&vma->active);
	if (err)
		goto err_unpin;

	/*
	 * And mark it as a globally pinned object to let the shrinker know
	 * it cannot reclaim the object until we release it.
	 */
	i915_vma_make_unshrinkable(vma);
	vma->obj->mm.dirty = true;

	return 0;

err_unpin:
	i915_vma_unpin(vma);
	return err;
}

static void __context_unpin_state(struct i915_vma *vma)
{
	i915_vma_make_shrinkable(vma);
	i915_active_release(&vma->active);
	__i915_vma_unpin(vma);
}

static int __ring_active(struct intel_ring *ring,
			 struct i915_gem_ww_ctx *ww)
{
	int err;

	err = intel_ring_pin(ring, ww);
	if (err)
		return err;

	err = i915_active_acquire(&ring->vma->active);
	if (err)
		goto err_pin;

	return 0;

err_pin:
	intel_ring_unpin(ring);
	return err;
}

static void __ring_retire(struct intel_ring *ring)
{
	i915_active_release(&ring->vma->active);
	intel_ring_unpin(ring);
}

static int intel_context_pre_pin(struct intel_context *ce,
				 struct i915_gem_ww_ctx *ww)
{
	int err;

	CE_TRACE(ce, "active\n");

	err = __ring_active(ce->ring, ww);
	if (err)
		return err;

	err = intel_timeline_pin(ce->timeline, ww);
	if (err)
		goto err_ring;

	if (!ce->state)
		return 0;

	err = __context_pin_state(ce->state, ww);
	if (err)
		goto err_timeline;


	return 0;

err_timeline:
	intel_timeline_unpin(ce->timeline);
err_ring:
	__ring_retire(ce->ring);
	return err;
}

static void intel_context_post_unpin(struct intel_context *ce)
{
	if (ce->state)
		__context_unpin_state(ce->state);

	intel_timeline_unpin(ce->timeline);
	__ring_retire(ce->ring);
}

int __intel_context_do_pin_ww(struct intel_context *ce,
			      struct i915_gem_ww_ctx *ww)
{
	bool handoff = false;
	void *vaddr;
	int err = 0;

	if (unlikely(!test_bit(CONTEXT_ALLOC_BIT, &ce->flags))) {
		err = intel_context_alloc_state(ce);
		if (err)
			return err;
	}

	/*
	 * We always pin the context/ring/timeline here, to ensure a pin
	 * refcount for __intel_context_active(), which prevent a lock
	 * inversion of ce->pin_mutex vs dma_resv_lock().
	 */

	err = i915_gem_object_lock(ce->timeline->hwsp_ggtt->obj, ww);
	if (!err && ce->ring->vma->obj)
		err = i915_gem_object_lock(ce->ring->vma->obj, ww);
	if (!err && ce->state)
		err = i915_gem_object_lock(ce->state->obj, ww);
	if (!err)
		err = intel_context_pre_pin(ce, ww);
	if (err)
		return err;

	err = i915_active_acquire(&ce->active);
	if (err)
		goto err_ctx_unpin;

	err = ce->ops->pre_pin(ce, ww, &vaddr);
	if (err)
		goto err_release;

	err = mutex_lock_interruptible(&ce->pin_mutex);
	if (err)
		goto err_post_unpin;

	if (unlikely(intel_context_is_closed(ce))) {
		err = -ENOENT;
		goto err_unlock;
	}

	if (likely(!atomic_add_unless(&ce->pin_count, 1, 0))) {
		err = intel_context_active_acquire(ce);
		if (unlikely(err))
			goto err_unlock;

		err = ce->ops->pin(ce, vaddr);
		if (err) {
			intel_context_active_release(ce);
			goto err_unlock;
		}

		CE_TRACE(ce, "pin ring:{start:%08x, head:%04x, tail:%04x}\n",
			 i915_ggtt_offset(ce->ring->vma),
			 ce->ring->head, ce->ring->tail);

		handoff = true;
		smp_mb__before_atomic(); /* flush pin before it is visible */
		atomic_inc(&ce->pin_count);
	}

	GEM_BUG_ON(!intel_context_is_pinned(ce)); /* no overflow! */

err_unlock:
	mutex_unlock(&ce->pin_mutex);
err_post_unpin:
	if (!handoff)
		ce->ops->post_unpin(ce);
err_release:
	i915_active_release(&ce->active);
err_ctx_unpin:
	intel_context_post_unpin(ce);

	/*
	 * Unlock the hwsp_ggtt object since it's shared.
	 * In principle we can unlock all the global state locked above
	 * since it's pinned and doesn't need fencing, and will
	 * thus remain resident until it is explicitly unpinned.
	 */
	i915_gem_ww_unlock_single(ce->timeline->hwsp_ggtt->obj);

	return err;
}

int __intel_context_do_pin(struct intel_context *ce)
{
	struct i915_gem_ww_ctx ww;
	int err;

	i915_gem_ww_ctx_init(&ww, true);
retry:
	err = __intel_context_do_pin_ww(ce, &ww);
	if (err == -EDEADLK) {
		err = i915_gem_ww_ctx_backoff(&ww);
		if (!err)
			goto retry;
	}
	i915_gem_ww_ctx_fini(&ww);
	return err;
}

void intel_context_unpin(struct intel_context *ce)
{
	if (!atomic_dec_and_test(&ce->pin_count))
		return;

	CE_TRACE(ce, "unpin\n");
	ce->ops->unpin(ce);
	ce->ops->post_unpin(ce);

	/*
	 * Once released, we may asynchronously drop the active reference.
	 * As that may be the only reference keeping the context alive,
	 * take an extra now so that it is not freed before we finish
	 * dereferencing it.
	 */
	intel_context_get(ce);
	intel_context_active_release(ce);
	intel_context_put(ce);
}

__i915_active_call
static void __intel_context_retire(struct i915_active *active)
{
	struct intel_context *ce = container_of(active, typeof(*ce), active);

	CE_TRACE(ce, "retire runtime: { total:%lluns, avg:%lluns }\n",
		 intel_context_get_total_runtime_ns(ce),
		 intel_context_get_avg_runtime_ns(ce));

	set_bit(CONTEXT_VALID_BIT, &ce->flags);
	intel_context_post_unpin(ce);
	intel_context_put(ce);
}

static int __intel_context_active(struct i915_active *active)
{
	struct intel_context *ce = container_of(active, typeof(*ce), active);

	intel_context_get(ce);

	/* everything should already be activated by intel_context_pre_pin() */
	GEM_WARN_ON(!i915_active_acquire_if_busy(&ce->ring->vma->active));
	__intel_ring_pin(ce->ring);

	__intel_timeline_pin(ce->timeline);

	if (ce->state) {
		GEM_WARN_ON(!i915_active_acquire_if_busy(&ce->state->active));
		__i915_vma_pin(ce->state);
		i915_vma_make_unshrinkable(ce->state);
	}

	return 0;
}

void
intel_context_init(struct intel_context *ce,
		   struct intel_engine_cs *engine)
{
	GEM_BUG_ON(!engine->cops);
	GEM_BUG_ON(!engine->gt->vm);

	kref_init(&ce->ref);

	ce->engine = engine;
	ce->ops = engine->cops;
	ce->sseu = engine->sseu;
	ce->ring = __intel_context_ring_size(SZ_4K);

	ewma_runtime_init(&ce->runtime.avg);

	ce->vm = i915_vm_get(engine->gt->vm);

	INIT_LIST_HEAD(&ce->signal_link);
	INIT_LIST_HEAD(&ce->signals);

	mutex_init(&ce->pin_mutex);

	i915_active_init(&ce->active,
			 __intel_context_active, __intel_context_retire);
}

void intel_context_fini(struct intel_context *ce)
{
	if (ce->timeline)
		intel_timeline_put(ce->timeline);
	i915_vm_put(ce->vm);

	mutex_destroy(&ce->pin_mutex);
	i915_active_fini(&ce->active);
}

static void i915_global_context_shrink(void)
{
	kmem_cache_shrink(global.slab_ce);
}

static void i915_global_context_exit(void)
{
	kmem_cache_destroy(global.slab_ce);
}

static struct i915_global_context global = { {
	.shrink = i915_global_context_shrink,
	.exit = i915_global_context_exit,
} };

int __init i915_global_context_init(void)
{
	global.slab_ce = KMEM_CACHE(intel_context, SLAB_HWCACHE_ALIGN);
	if (!global.slab_ce)
		return -ENOMEM;

	i915_global_register(&global.base);
	return 0;
}

void intel_context_enter_engine(struct intel_context *ce)
{
	intel_engine_pm_get(ce->engine);
	intel_timeline_enter(ce->timeline);
}

void intel_context_exit_engine(struct intel_context *ce)
{
	intel_timeline_exit(ce->timeline);
	intel_engine_pm_put(ce->engine);
}

int intel_context_prepare_remote_request(struct intel_context *ce,
					 struct i915_request *rq)
{
	struct intel_timeline *tl = ce->timeline;
	int err;

	/* Only suitable for use in remotely modifying this context */
	GEM_BUG_ON(rq->context == ce);

	if (rcu_access_pointer(rq->timeline) != tl) { /* timeline sharing! */
		/* Queue this switch after current activity by this context. */
		err = i915_active_fence_set(&tl->last_request, rq);
		if (err)
			return err;
	}

	/*
	 * Guarantee context image and the timeline remains pinned until the
	 * modifying request is retired by setting the ce activity tracker.
	 *
	 * But we only need to take one pin on the account of it. Or in other
	 * words transfer the pinned ce object to tracked active request.
	 */
	GEM_BUG_ON(i915_active_is_idle(&ce->active));
	return i915_active_add_request(&ce->active, rq);
}

struct i915_request *intel_context_create_request(struct intel_context *ce)
{
	struct i915_gem_ww_ctx ww;
	struct i915_request *rq;
	int err;

	i915_gem_ww_ctx_init(&ww, true);
retry:
	err = intel_context_pin_ww(ce, &ww);
	if (!err) {
		rq = i915_request_create(ce);
		intel_context_unpin(ce);
	} else if (err == -EDEADLK) {
		err = i915_gem_ww_ctx_backoff(&ww);
		if (!err)
			goto retry;
		rq = ERR_PTR(err);
	} else {
		rq = ERR_PTR(err);
	}

	i915_gem_ww_ctx_fini(&ww);

	if (IS_ERR(rq))
		return rq;

	/*
	 * timeline->mutex should be the inner lock, but is used as outer lock.
	 * Hack around this to shut up lockdep in selftests..
	 */
	lockdep_unpin_lock(&ce->timeline->mutex, rq->cookie);
	mutex_release(&ce->timeline->mutex.dep_map, _RET_IP_);
	mutex_acquire(&ce->timeline->mutex.dep_map, SINGLE_DEPTH_NESTING, 0, _RET_IP_);
	rq->cookie = lockdep_pin_lock(&ce->timeline->mutex);

	return rq;
}

#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftest_context.c"
#endif
Commit	Line	Data
c4d52feb CW	1	/*
	2	* SPDX-License-Identifier: MIT
	3	*
	4	* Copyright © 2019 Intel Corporation
	5	*/
	6
10be98a7 CW	7	#include "gem/i915_gem_context.h"
	8	#include "gem/i915_gem_pm.h"
	9
c4d52feb	10	#include "i915_drv.h"
c4d52feb	11	#include "i915_globals.h"
112ed2d3	12
c4d52feb	13	#include "intel_context.h"
112ed2d3	14	#include "intel_engine.h"
79ffac85	15	#include "intel_engine_pm.h"
2871ea85	16	#include "intel_ring.h"
c4d52feb CW	17
	18	static struct i915_global_context {
	19	struct i915_global base;
	20	struct kmem_cache *slab_ce;
	21	} global;
	22
5e2a0419	23	static struct intel_context *intel_context_alloc(void)
c4d52feb CW	24	{
	25	return kmem_cache_zalloc(global.slab_ce, GFP_KERNEL);
	26	}
	27
	28	void intel_context_free(struct intel_context *ce)
	29	{
	30	kmem_cache_free(global.slab_ce, ce);
	31	}
	32
	33	struct intel_context *
e6ba7648	34	intel_context_create(struct intel_engine_cs *engine)
c4d52feb	35	{
5e2a0419	36	struct intel_context *ce;
c4d52feb CW	37
	38	ce = intel_context_alloc();
	39	if (!ce)
	40	return ERR_PTR(-ENOMEM);
	41
e6ba7648	42	intel_context_init(ce, engine);
5e2a0419	43	return ce;
c4d52feb CW	44	}
c4d52feb CW	45
89f98d63 CW	46	int intel_context_alloc_state(struct intel_context *ce)
	47	{
	48	int err = 0;
	49
	50	if (mutex_lock_interruptible(&ce->pin_mutex))
	51	return -EINTR;
	52
	53	if (!test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
373f27f2 CW	54	if (intel_context_is_banned(ce)) {
	55	err = -EIO;
	56	goto unlock;
	57	}
	58
89f98d63 CW	59	err = ce->ops->alloc(ce);
	60	if (unlikely(err))
	61	goto unlock;
	62
	63	set_bit(CONTEXT_ALLOC_BIT, &ce->flags);
	64	}
	65
	66	unlock:
	67	mutex_unlock(&ce->pin_mutex);
	68	return err;
	69	}
	70
b11b28ea CW	71	static int intel_context_active_acquire(struct intel_context *ce)
	72	{
	73	int err;
	74
e5429340 CW	75	__i915_active_acquire(&ce->active);
	76
	77	if (intel_context_is_barrier(ce))
	78	return 0;
b11b28ea CW	79
b11b28ea CW	80	/* Preallocate tracking nodes */
e5429340 CW	81	err = i915_active_acquire_preallocate_barrier(&ce->active,
	82	ce->engine);
	83	if (err)
	84	i915_active_release(&ce->active);
b11b28ea	85
e5429340	86	return err;
b11b28ea CW	87	}
	88
	89	static void intel_context_active_release(struct intel_context *ce)
	90	{
	91	/* Nodes preallocated in intel_context_active() */
	92	i915_active_acquire_barrier(&ce->active);
	93	i915_active_release(&ce->active);
	94	}
	95
47b08693	96	static int __context_pin_state(struct i915_vma vma, struct i915_gem_ww_ctx ww)
c4d52feb	97	{
ccd20945	98	unsigned int bias = i915_ggtt_pin_bias(vma) \| PIN_OFFSET_BIAS;
ce476c80	99	int err;
c4d52feb	100
47b08693	101	err = i915_ggtt_pin(vma, ww, 0, bias \| PIN_HIGH);
ce476c80 CW	102	if (err)
	103	return err;
	104
1b8bfc57 CW	105	err = i915_active_acquire(&vma->active);
	106	if (err)
	107	goto err_unpin;
	108
ce476c80 CW	109	/*
	110	* And mark it as a globally pinned object to let the shrinker know
	111	* it cannot reclaim the object until we release it.
	112	*/
1aff1903	113	i915_vma_make_unshrinkable(vma);
ce476c80 CW	114	vma->obj->mm.dirty = true;
	115
	116	return 0;
1b8bfc57 CW	117
	118	err_unpin:
	119	i915_vma_unpin(vma);
	120	return err;
ce476c80 CW	121	}
	122
	123	static void __context_unpin_state(struct i915_vma *vma)
	124	{
1aff1903	125	i915_vma_make_shrinkable(vma);
1b8bfc57	126	i915_active_release(&vma->active);
99013b10	127	__i915_vma_unpin(vma);
ce476c80 CW	128	}
ce476c80 CW	129
47b08693 ML	130	static int __ring_active(struct intel_ring *ring,
47b08693 ML	131	struct i915_gem_ww_ctx *ww)
8ccfc20a CW	132	{
	133	int err;
	134
47b08693	135	err = intel_ring_pin(ring, ww);
8ccfc20a CW	136	if (err)
	137	return err;
	138
5a383d44	139	err = i915_active_acquire(&ring->vma->active);
8ccfc20a	140	if (err)
5a383d44	141	goto err_pin;
8ccfc20a CW	142
	143	return 0;
	144
5a383d44 CW	145	err_pin:
5a383d44 CW	146	intel_ring_unpin(ring);
8ccfc20a CW	147	return err;
	148	}
	149
	150	static void __ring_retire(struct intel_ring *ring)
	151	{
8ccfc20a	152	i915_active_release(&ring->vma->active);
5a383d44	153	intel_ring_unpin(ring);
8ccfc20a CW	154	}
8ccfc20a CW	155
47b08693 ML	156	static int intel_context_pre_pin(struct intel_context *ce,
47b08693 ML	157	struct i915_gem_ww_ctx *ww)
3999a708 ML	158	{
	159	int err;
	160
	161	CE_TRACE(ce, "active\n");
	162
47b08693	163	err = __ring_active(ce->ring, ww);
3999a708 ML	164	if (err)
	165	return err;
	166
47b08693	167	err = intel_timeline_pin(ce->timeline, ww);
3999a708 ML	168	if (err)
	169	goto err_ring;
	170
	171	if (!ce->state)
	172	return 0;
	173
47b08693	174	err = __context_pin_state(ce->state, ww);
3999a708 ML	175	if (err)
	176	goto err_timeline;
	177
	178
	179	return 0;
	180
	181	err_timeline:
	182	intel_timeline_unpin(ce->timeline);
	183	err_ring:
	184	__ring_retire(ce->ring);
	185	return err;
	186	}
	187
	188	static void intel_context_post_unpin(struct intel_context *ce)
	189	{
	190	if (ce->state)
	191	__context_unpin_state(ce->state);
	192
	193	intel_timeline_unpin(ce->timeline);
	194	__ring_retire(ce->ring);
	195	}
	196
47b08693 ML	197	int __intel_context_do_pin_ww(struct intel_context *ce,
47b08693 ML	198	struct i915_gem_ww_ctx *ww)
3999a708 ML	199	{
	200	bool handoff = false;
	201	void *vaddr;
	202	int err = 0;
	203
	204	if (unlikely(!test_bit(CONTEXT_ALLOC_BIT, &ce->flags))) {
	205	err = intel_context_alloc_state(ce);
	206	if (err)
	207	return err;
	208	}
	209
	210	/*
	211	* We always pin the context/ring/timeline here, to ensure a pin
	212	* refcount for __intel_context_active(), which prevent a lock
	213	* inversion of ce->pin_mutex vs dma_resv_lock().
	214	*/
47b08693 ML	215
	216	err = i915_gem_object_lock(ce->timeline->hwsp_ggtt->obj, ww);
	217	if (!err && ce->ring->vma->obj)
	218	err = i915_gem_object_lock(ce->ring->vma->obj, ww);
	219	if (!err && ce->state)
	220	err = i915_gem_object_lock(ce->state->obj, ww);
	221	if (!err)
	222	err = intel_context_pre_pin(ce, ww);
3999a708 ML	223	if (err)
	224	return err;
	225
	226	err = i915_active_acquire(&ce->active);
	227	if (err)
	228	goto err_ctx_unpin;
	229
47b08693	230	err = ce->ops->pre_pin(ce, ww, &vaddr);
3999a708 ML	231	if (err)
	232	goto err_release;
	233
	234	err = mutex_lock_interruptible(&ce->pin_mutex);
	235	if (err)
	236	goto err_post_unpin;
	237
	238	if (unlikely(intel_context_is_closed(ce))) {
	239	err = -ENOENT;
	240	goto err_unlock;
	241	}
	242
	243	if (likely(!atomic_add_unless(&ce->pin_count, 1, 0))) {
	244	err = intel_context_active_acquire(ce);
	245	if (unlikely(err))
	246	goto err_unlock;
	247
	248	err = ce->ops->pin(ce, vaddr);
	249	if (err) {
	250	intel_context_active_release(ce);
	251	goto err_unlock;
	252	}
	253
	254	CE_TRACE(ce, "pin ring:{start:%08x, head:%04x, tail:%04x}\n",
	255	i915_ggtt_offset(ce->ring->vma),
	256	ce->ring->head, ce->ring->tail);
	257
	258	handoff = true;
	259	smp_mb__before_atomic(); /* flush pin before it is visible */
	260	atomic_inc(&ce->pin_count);
	261	}
	262
	263	GEM_BUG_ON(!intel_context_is_pinned(ce)); /* no overflow! */
	264
	265	err_unlock:
	266	mutex_unlock(&ce->pin_mutex);
	267	err_post_unpin:
	268	if (!handoff)
	269	ce->ops->post_unpin(ce);
	270	err_release:
	271	i915_active_release(&ce->active);
	272	err_ctx_unpin:
	273	intel_context_post_unpin(ce);
e0ee152f TH	274
	275	/*
	276	* Unlock the hwsp_ggtt object since it's shared.
	277	* In principle we can unlock all the global state locked above
	278	* since it's pinned and doesn't need fencing, and will
	279	* thus remain resident until it is explicitly unpinned.
	280	*/
	281	i915_gem_ww_unlock_single(ce->timeline->hwsp_ggtt->obj);
	282
3999a708 ML	283	return err;
	284	}
	285
47b08693 ML	286	int __intel_context_do_pin(struct intel_context *ce)
	287	{
	288	struct i915_gem_ww_ctx ww;
	289	int err;
	290
	291	i915_gem_ww_ctx_init(&ww, true);
	292	retry:
	293	err = __intel_context_do_pin_ww(ce, &ww);
	294	if (err == -EDEADLK) {
	295	err = i915_gem_ww_ctx_backoff(&ww);
	296	if (!err)
	297	goto retry;
	298	}
	299	i915_gem_ww_ctx_fini(&ww);
	300	return err;
	301	}
	302
3999a708 ML	303	void intel_context_unpin(struct intel_context *ce)
	304	{
	305	if (!atomic_dec_and_test(&ce->pin_count))
	306	return;
	307
	308	CE_TRACE(ce, "unpin\n");
	309	ce->ops->unpin(ce);
	310	ce->ops->post_unpin(ce);
	311
	312	/*
	313	* Once released, we may asynchronously drop the active reference.
	314	* As that may be the only reference keeping the context alive,
	315	* take an extra now so that it is not freed before we finish
	316	* dereferencing it.
	317	*/
	318	intel_context_get(ce);
	319	intel_context_active_release(ce);
	320	intel_context_put(ce);
	321	}
	322
274cbf20	323	__i915_active_call
12c255b5	324	static void __intel_context_retire(struct i915_active *active)
ce476c80 CW	325	{
	326	struct intel_context ce = container_of(active, typeof(ce), active);
	327
1883a0a4 TU	328	CE_TRACE(ce, "retire runtime: { total:%lluns, avg:%lluns }\n",
	329	intel_context_get_total_runtime_ns(ce),
	330	intel_context_get_avg_runtime_ns(ce));
cba17e5d	331
f70de8d2	332	set_bit(CONTEXT_VALID_BIT, &ce->flags);
3999a708	333	intel_context_post_unpin(ce);
ce476c80	334	intel_context_put(ce);
c4d52feb CW	335	}
c4d52feb CW	336
12c255b5	337	static int __intel_context_active(struct i915_active *active)
ce476c80	338	{
12c255b5	339	struct intel_context ce = container_of(active, typeof(ce), active);
ce476c80	340
ce476c80 CW	341	intel_context_get(ce);
ce476c80 CW	342
3999a708	343	/* everything should already be activated by intel_context_pre_pin() */
47b08693 ML	344	GEM_WARN_ON(!i915_active_acquire_if_busy(&ce->ring->vma->active));
47b08693 ML	345	__intel_ring_pin(ce->ring);
09c5ab38	346
47b08693	347	__intel_timeline_pin(ce->timeline);
75d0a7f3	348
3999a708 ML	349	if (ce->state) {
	350	GEM_WARN_ON(!i915_active_acquire_if_busy(&ce->state->active));
	351	__i915_vma_pin(ce->state);
	352	i915_vma_make_unshrinkable(ce->state);
	353	}
ce476c80	354
d8af05ff	355	return 0;
d8af05ff CW	356	}
d8af05ff CW	357
12c255b5 CW	358	void
12c255b5 CW	359	intel_context_init(struct intel_context *ce,
12c255b5	360	struct intel_engine_cs *engine)
ce476c80	361	{
12c255b5	362	GEM_BUG_ON(!engine->cops);
e6ba7648	363	GEM_BUG_ON(!engine->gt->vm);
12c255b5 CW	364
	365	kref_init(&ce->ref);
	366
12c255b5 CW	367	ce->engine = engine;
	368	ce->ops = engine->cops;
	369	ce->sseu = engine->sseu;
e6ba7648 CW	370	ce->ring = __intel_context_ring_size(SZ_4K);
e6ba7648 CW	371
1883a0a4 TU	372	ewma_runtime_init(&ce->runtime.avg);
1883a0a4 TU	373
e6ba7648	374	ce->vm = i915_vm_get(engine->gt->vm);
12c255b5 CW	375
	376	INIT_LIST_HEAD(&ce->signal_link);
	377	INIT_LIST_HEAD(&ce->signals);
	378
	379	mutex_init(&ce->pin_mutex);
	380
b1e3177b	381	i915_active_init(&ce->active,
12c255b5	382	__intel_context_active, __intel_context_retire);
c4d52feb CW	383	}
c4d52feb CW	384
df8cf31e CW	385	void intel_context_fini(struct intel_context *ce)
df8cf31e CW	386	{
75d0a7f3 CW	387	if (ce->timeline)
75d0a7f3 CW	388	intel_timeline_put(ce->timeline);
f5d974f9 CW	389	i915_vm_put(ce->vm);
f5d974f9 CW	390
df8cf31e CW	391	mutex_destroy(&ce->pin_mutex);
	392	i915_active_fini(&ce->active);
	393	}
	394
c4d52feb CW	395	static void i915_global_context_shrink(void)
	396	{
	397	kmem_cache_shrink(global.slab_ce);
	398	}
	399
	400	static void i915_global_context_exit(void)
	401	{
	402	kmem_cache_destroy(global.slab_ce);
	403	}
	404
	405	static struct i915_global_context global = { {
	406	.shrink = i915_global_context_shrink,
	407	.exit = i915_global_context_exit,
	408	} };
	409
	410	int __init i915_global_context_init(void)
	411	{
	412	global.slab_ce = KMEM_CACHE(intel_context, SLAB_HWCACHE_ALIGN);
	413	if (!global.slab_ce)
	414	return -ENOMEM;
	415
	416	i915_global_register(&global.base);
	417	return 0;
	418	}
6eee33e8 CW	419
	420	void intel_context_enter_engine(struct intel_context *ce)
	421	{
79ffac85	422	intel_engine_pm_get(ce->engine);
531958f6	423	intel_timeline_enter(ce->timeline);
6eee33e8 CW	424	}
	425
	426	void intel_context_exit_engine(struct intel_context *ce)
	427	{
531958f6	428	intel_timeline_exit(ce->timeline);
af7a272e	429	intel_engine_pm_put(ce->engine);
6eee33e8	430	}
5e2a0419	431
a9877da2 CW	432	int intel_context_prepare_remote_request(struct intel_context *ce,
	433	struct i915_request *rq)
	434	{
75d0a7f3	435	struct intel_timeline *tl = ce->timeline;
a9877da2 CW	436	int err;
	437
	438	/* Only suitable for use in remotely modifying this context */
9f3ccd40	439	GEM_BUG_ON(rq->context == ce);
a9877da2	440
d19d71fc	441	if (rcu_access_pointer(rq->timeline) != tl) { /* timeline sharing! */
340c4c8d	442	/* Queue this switch after current activity by this context. */
b1e3177b	443	err = i915_active_fence_set(&tl->last_request, rq);
340c4c8d	444	if (err)
25ffd4b1	445	return err;
340c4c8d	446	}
a9877da2 CW	447
	448	/*
	449	* Guarantee context image and the timeline remains pinned until the
	450	* modifying request is retired by setting the ce activity tracker.
	451	*
	452	* But we only need to take one pin on the account of it. Or in other
	453	* words transfer the pinned ce object to tracked active request.
	454	*/
	455	GEM_BUG_ON(i915_active_is_idle(&ce->active));
d19d71fc	456	return i915_active_add_request(&ce->active, rq);
a9877da2 CW	457	}
a9877da2 CW	458
5e2a0419 CW	459	struct i915_request intel_context_create_request(struct intel_context ce)
5e2a0419 CW	460	{
8a929c9e	461	struct i915_gem_ww_ctx ww;
5e2a0419 CW	462	struct i915_request *rq;
	463	int err;
	464
8a929c9e ML	465	i915_gem_ww_ctx_init(&ww, true);
	466	retry:
	467	err = intel_context_pin_ww(ce, &ww);
	468	if (!err) {
	469	rq = i915_request_create(ce);
	470	intel_context_unpin(ce);
	471	} else if (err == -EDEADLK) {
	472	err = i915_gem_ww_ctx_backoff(&ww);
	473	if (!err)
	474	goto retry;
159ace7f	475	rq = ERR_PTR(err);
8a929c9e ML	476	} else {
	477	rq = ERR_PTR(err);
	478	}
5e2a0419	479
8a929c9e	480	i915_gem_ww_ctx_fini(&ww);
5e2a0419	481
dd878c0c ML	482	if (IS_ERR(rq))
	483	return rq;
	484
	485	/*
	486	* timeline->mutex should be the inner lock, but is used as outer lock.
	487	* Hack around this to shut up lockdep in selftests..
	488	*/
	489	lockdep_unpin_lock(&ce->timeline->mutex, rq->cookie);
	490	mutex_release(&ce->timeline->mutex.dep_map, _RET_IP_);
	491	mutex_acquire(&ce->timeline->mutex.dep_map, SINGLE_DEPTH_NESTING, 0, _RET_IP_);
	492	rq->cookie = lockdep_pin_lock(&ce->timeline->mutex);
	493
5e2a0419 CW	494	return rq;
5e2a0419 CW	495	}
d8af05ff CW	496
	497	#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
	498	#include "selftest_context.c"
	499	#endif