summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/i915/gvt/sched_policy.c
blob: 678b0be853763ab4b0381a9a4f25880ea075c7a3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
/*
 * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Authors:
 *    Anhua Xu
 *    Kevin Tian <kevin.tian@intel.com>
 *
 * Contributors:
 *    Min He <min.he@intel.com>
 *    Bing Niu <bing.niu@intel.com>
 *    Zhi Wang <zhi.a.wang@intel.com>
 *
 */

#include "i915_drv.h"
#include "gvt.h"

static bool vgpu_has_pending_workload(struct intel_vgpu *vgpu)
{
	enum intel_engine_id i;
	struct intel_engine_cs *engine;

	for_each_engine(engine, vgpu->gvt->dev_priv, i) {
		if (!list_empty(workload_q_head(vgpu, i)))
			return true;
	}

	return false;
}

static void try_to_schedule_next_vgpu(struct intel_gvt *gvt)
{
	struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
	enum intel_engine_id i;
	struct intel_engine_cs *engine;

	/* no target to schedule */
	if (!scheduler->next_vgpu)
		return;

	gvt_dbg_sched("try to schedule next vgpu %d\n",
			scheduler->next_vgpu->id);

	/*
	 * after the flag is set, workload dispatch thread will
	 * stop dispatching workload for current vgpu
	 */
	scheduler->need_reschedule = true;

	/* still have uncompleted workload? */
	for_each_engine(engine, gvt->dev_priv, i) {
		if (scheduler->current_workload[i]) {
			gvt_dbg_sched("still have running workload\n");
			return;
		}
	}

	gvt_dbg_sched("switch to next vgpu %d\n",
			scheduler->next_vgpu->id);

	/* switch current vgpu */
	scheduler->current_vgpu = scheduler->next_vgpu;
	scheduler->next_vgpu = NULL;

	scheduler->need_reschedule = false;

	/* wake up workload dispatch thread */
	for_each_engine(engine, gvt->dev_priv, i)
		wake_up(&scheduler->waitq[i]);
}

struct tbs_vgpu_data {
	struct list_head list;
	struct intel_vgpu *vgpu;
	/* put some per-vgpu sched stats here */
};

struct tbs_sched_data {
	struct intel_gvt *gvt;
	struct delayed_work work;
	unsigned long period;
	struct list_head runq_head;
};

#define GVT_DEFAULT_TIME_SLICE (1 * HZ / 1000)

static void tbs_sched_func(struct work_struct *work)
{
	struct tbs_sched_data *sched_data = container_of(work,
			struct tbs_sched_data, work.work);
	struct tbs_vgpu_data *vgpu_data;

	struct intel_gvt *gvt = sched_data->gvt;
	struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;

	struct intel_vgpu *vgpu = NULL;
	struct list_head *pos, *head;

	mutex_lock(&gvt->lock);

	/* no vgpu or has already had a target */
	if (list_empty(&sched_data->runq_head) || scheduler->next_vgpu)
		goto out;

	if (scheduler->current_vgpu) {
		vgpu_data = scheduler->current_vgpu->sched_data;
		head = &vgpu_data->list;
	} else {
		gvt_dbg_sched("no current vgpu search from q head\n");
		head = &sched_data->runq_head;
	}

	/* search a vgpu with pending workload */
	list_for_each(pos, head) {
		if (pos == &sched_data->runq_head)
			continue;

		vgpu_data = container_of(pos, struct tbs_vgpu_data, list);
		if (!vgpu_has_pending_workload(vgpu_data->vgpu))
			continue;

		vgpu = vgpu_data->vgpu;
		break;
	}

	if (vgpu) {
		scheduler->next_vgpu = vgpu;
		gvt_dbg_sched("pick next vgpu %d\n", vgpu->id);
	}
out:
	if (scheduler->next_vgpu) {
		gvt_dbg_sched("try to schedule next vgpu %d\n",
				scheduler->next_vgpu->id);
		try_to_schedule_next_vgpu(gvt);
	}

	/*
	 * still have vgpu on runq
	 * or last schedule haven't finished due to running workload
	 */
	if (!list_empty(&sched_data->runq_head) || scheduler->next_vgpu)
		schedule_delayed_work(&sched_data->work, sched_data->period);

	mutex_unlock(&gvt->lock);
}

static int tbs_sched_init(struct intel_gvt *gvt)
{
	struct intel_gvt_workload_scheduler *scheduler =
		&gvt->scheduler;

	struct tbs_sched_data *data;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	INIT_LIST_HEAD(&data->runq_head);
	INIT_DELAYED_WORK(&data->work, tbs_sched_func);
	data->period = GVT_DEFAULT_TIME_SLICE;
	data->gvt = gvt;

	scheduler->sched_data = data;
	return 0;
}

static void tbs_sched_clean(struct intel_gvt *gvt)
{
	struct intel_gvt_workload_scheduler *scheduler =
		&gvt->scheduler;
	struct tbs_sched_data *data = scheduler->sched_data;

	cancel_delayed_work(&data->work);
	kfree(data);
	scheduler->sched_data = NULL;
}

static int tbs_sched_init_vgpu(struct intel_vgpu *vgpu)
{
	struct tbs_vgpu_data *data;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->vgpu = vgpu;
	INIT_LIST_HEAD(&data->list);

	vgpu->sched_data = data;
	return 0;
}

static void tbs_sched_clean_vgpu(struct intel_vgpu *vgpu)
{
	kfree(vgpu->sched_data);
	vgpu->sched_data = NULL;
}

static void tbs_sched_start_schedule(struct intel_vgpu *vgpu)
{
	struct tbs_sched_data *sched_data = vgpu->gvt->scheduler.sched_data;
	struct tbs_vgpu_data *vgpu_data = vgpu->sched_data;

	if (!list_empty(&vgpu_data->list))
		return;

	list_add_tail(&vgpu_data->list, &sched_data->runq_head);
	schedule_delayed_work(&sched_data->work, sched_data->period);
}

static void tbs_sched_stop_schedule(struct intel_vgpu *vgpu)
{
	struct tbs_vgpu_data *vgpu_data = vgpu->sched_data;

	list_del_init(&vgpu_data->list);
}

static struct intel_gvt_sched_policy_ops tbs_schedule_ops = {
	.init = tbs_sched_init,
	.clean = tbs_sched_clean,
	.init_vgpu = tbs_sched_init_vgpu,
	.clean_vgpu = tbs_sched_clean_vgpu,
	.start_schedule = tbs_sched_start_schedule,
	.stop_schedule = tbs_sched_stop_schedule,
};

int intel_gvt_init_sched_policy(struct intel_gvt *gvt)
{
	gvt->scheduler.sched_ops = &tbs_schedule_ops;

	return gvt->scheduler.sched_ops->init(gvt);
}

void intel_gvt_clean_sched_policy(struct intel_gvt *gvt)
{
	gvt->scheduler.sched_ops->clean(gvt);
}

int intel_vgpu_init_sched_policy(struct intel_vgpu *vgpu)
{
	return vgpu->gvt->scheduler.sched_ops->init_vgpu(vgpu);
}

void intel_vgpu_clean_sched_policy(struct intel_vgpu *vgpu)
{
	vgpu->gvt->scheduler.sched_ops->clean_vgpu(vgpu);
}

void intel_vgpu_start_schedule(struct intel_vgpu *vgpu)
{
	gvt_dbg_core("vgpu%d: start schedule\n", vgpu->id);

	vgpu->gvt->scheduler.sched_ops->start_schedule(vgpu);
}

void intel_vgpu_stop_schedule(struct intel_vgpu *vgpu)
{
	struct intel_gvt_workload_scheduler *scheduler =
		&vgpu->gvt->scheduler;

	gvt_dbg_core("vgpu%d: stop schedule\n", vgpu->id);

	scheduler->sched_ops->stop_schedule(vgpu);

	if (scheduler->next_vgpu == vgpu)
		scheduler->next_vgpu = NULL;

	if (scheduler->current_vgpu == vgpu) {
		/* stop workload dispatching */
		scheduler->need_reschedule = true;
		scheduler->current_vgpu = NULL;
	}
}