scheduler.c 15.2 KB
Newer Older
Z
Zhi Wang 已提交
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
/*
 * 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:
 *    Zhi Wang <zhi.a.wang@intel.com>
 *
 * Contributors:
 *    Ping Gao <ping.a.gao@intel.com>
 *    Tina Zhang <tina.zhang@intel.com>
 *    Chanbin Du <changbin.du@intel.com>
 *    Min He <min.he@intel.com>
 *    Bing Niu <bing.niu@intel.com>
 *    Zhenyu Wang <zhenyuw@linux.intel.com>
 *
 */

#include <linux/kthread.h>

38 39 40
#include "i915_drv.h"
#include "gvt.h"

Z
Zhi Wang 已提交
41 42 43
#define RING_CTX_OFF(x) \
	offsetof(struct execlist_ring_context, x)

44 45
static void set_context_pdp_root_pointer(
		struct execlist_ring_context *ring_context,
Z
Zhi Wang 已提交
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
		u32 pdp[8])
{
	struct execlist_mmio_pair *pdp_pair = &ring_context->pdp3_UDW;
	int i;

	for (i = 0; i < 8; i++)
		pdp_pair[i].val = pdp[7 - i];
}

static int populate_shadow_context(struct intel_vgpu_workload *workload)
{
	struct intel_vgpu *vgpu = workload->vgpu;
	struct intel_gvt *gvt = vgpu->gvt;
	int ring_id = workload->ring_id;
	struct i915_gem_context *shadow_ctx = workload->vgpu->shadow_ctx;
	struct drm_i915_gem_object *ctx_obj =
		shadow_ctx->engine[ring_id].state->obj;
	struct execlist_ring_context *shadow_ring_context;
	struct page *page;
	void *dst;
	unsigned long context_gpa, context_page_num;
	int i;

	gvt_dbg_sched("ring id %d workload lrca %x", ring_id,
			workload->ctx_desc.lrca);

	context_page_num = intel_lr_context_size(
73
			gvt->dev_priv->engine[ring_id]);
Z
Zhi Wang 已提交
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

	context_page_num = context_page_num >> PAGE_SHIFT;

	if (IS_BROADWELL(gvt->dev_priv) && ring_id == RCS)
		context_page_num = 19;

	i = 2;

	while (i < context_page_num) {
		context_gpa = intel_vgpu_gma_to_gpa(vgpu->gtt.ggtt_mm,
				(u32)((workload->ctx_desc.lrca + i) <<
				GTT_PAGE_SHIFT));
		if (context_gpa == INTEL_GVT_INVALID_ADDR) {
			gvt_err("Invalid guest context descriptor\n");
			return -EINVAL;
		}

		page = i915_gem_object_get_page(ctx_obj, LRC_PPHWSP_PN + i);
		dst = kmap_atomic(page);
		intel_gvt_hypervisor_read_gpa(vgpu, context_gpa, dst,
				GTT_PAGE_SIZE);
		kunmap_atomic(dst);
		i++;
	}

	page = i915_gem_object_get_page(ctx_obj, LRC_STATE_PN);
	shadow_ring_context = kmap_atomic(page);

#define COPY_REG(name) \
	intel_gvt_hypervisor_read_gpa(vgpu, workload->ring_context_gpa \
		+ RING_CTX_OFF(name.val), &shadow_ring_context->name.val, 4)

	COPY_REG(ctx_ctrl);
	COPY_REG(ctx_timestamp);

	if (ring_id == RCS) {
		COPY_REG(bb_per_ctx_ptr);
		COPY_REG(rcs_indirect_ctx);
		COPY_REG(rcs_indirect_ctx_offset);
	}
#undef COPY_REG

	set_context_pdp_root_pointer(shadow_ring_context,
				     workload->shadow_mm->shadow_page_table);

	intel_gvt_hypervisor_read_gpa(vgpu,
			workload->ring_context_gpa +
			sizeof(*shadow_ring_context),
			(void *)shadow_ring_context +
			sizeof(*shadow_ring_context),
			GTT_PAGE_SIZE - sizeof(*shadow_ring_context));

	kunmap_atomic(shadow_ring_context);
	return 0;
}

static int shadow_context_status_change(struct notifier_block *nb,
		unsigned long action, void *data)
{
	struct intel_vgpu *vgpu = container_of(nb,
			struct intel_vgpu, shadow_ctx_notifier_block);
	struct drm_i915_gem_request *req =
		(struct drm_i915_gem_request *)data;
	struct intel_gvt_workload_scheduler *scheduler =
		&vgpu->gvt->scheduler;
	struct intel_vgpu_workload *workload =
		scheduler->current_workload[req->engine->id];

	switch (action) {
	case INTEL_CONTEXT_SCHEDULE_IN:
Z
Zhi Wang 已提交
144 145
		intel_gvt_load_render_mmio(workload->vgpu,
					   workload->ring_id);
Z
Zhi Wang 已提交
146 147 148
		atomic_set(&workload->shadow_ctx_active, 1);
		break;
	case INTEL_CONTEXT_SCHEDULE_OUT:
Z
Zhi Wang 已提交
149 150
		intel_gvt_restore_render_mmio(workload->vgpu,
					      workload->ring_id);
Z
Zhi Wang 已提交
151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
		atomic_set(&workload->shadow_ctx_active, 0);
		break;
	default:
		WARN_ON(1);
		return NOTIFY_OK;
	}
	wake_up(&workload->shadow_ctx_status_wq);
	return NOTIFY_OK;
}

static int dispatch_workload(struct intel_vgpu_workload *workload)
{
	struct intel_vgpu *vgpu = workload->vgpu;
	struct intel_gvt *gvt = vgpu->gvt;
	int ring_id = workload->ring_id;
	struct i915_gem_context *shadow_ctx = workload->vgpu->shadow_ctx;
	struct drm_i915_private *dev_priv = workload->vgpu->gvt->dev_priv;
168
	struct drm_i915_gem_request *rq;
Z
Zhi Wang 已提交
169 170 171 172 173 174 175 176
	int ret;

	gvt_dbg_sched("ring id %d prepare to dispatch workload %p\n",
		ring_id, workload);

	shadow_ctx->desc_template = workload->ctx_desc.addressing_mode <<
				    GEN8_CTX_ADDRESSING_MODE_SHIFT;

177 178
	rq = i915_gem_request_alloc(dev_priv->engine[ring_id], shadow_ctx);
	if (IS_ERR(rq)) {
Z
Zhi Wang 已提交
179
		gvt_err("fail to allocate gem request\n");
180
		workload->status = PTR_ERR(rq);
Z
Zhi Wang 已提交
181 182 183
		return workload->status;
	}

184 185 186
	gvt_dbg_sched("ring id %d get i915 gem request %p\n", ring_id, rq);

	workload->req = i915_gem_request_get(rq);
Z
Zhi Wang 已提交
187 188 189

	mutex_lock(&gvt->lock);

Z
Zhi Wang 已提交
190 191 192 193 194 195 196 197
	ret = intel_gvt_scan_and_shadow_workload(workload);
	if (ret)
		goto err;

	ret = intel_gvt_scan_and_shadow_wa_ctx(&workload->wa_ctx);
	if (ret)
		goto err;

Z
Zhi Wang 已提交
198 199 200 201 202 203 204 205 206 207 208 209 210 211 212
	ret = populate_shadow_context(workload);
	if (ret)
		goto err;

	if (workload->prepare) {
		ret = workload->prepare(workload);
		if (ret)
			goto err;
	}

	mutex_unlock(&gvt->lock);

	gvt_dbg_sched("ring id %d submit workload to i915 %p\n",
			ring_id, workload->req);

213
	i915_add_request_no_flush(rq);
Z
Zhi Wang 已提交
214 215 216 217 218 219
	workload->dispatched = true;
	return 0;
err:
	workload->status = ret;

	mutex_unlock(&gvt->lock);
220 221

	i915_add_request_no_flush(rq);
Z
Zhi Wang 已提交
222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301
	return ret;
}

static struct intel_vgpu_workload *pick_next_workload(
		struct intel_gvt *gvt, int ring_id)
{
	struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
	struct intel_vgpu_workload *workload = NULL;

	mutex_lock(&gvt->lock);

	/*
	 * no current vgpu / will be scheduled out / no workload
	 * bail out
	 */
	if (!scheduler->current_vgpu) {
		gvt_dbg_sched("ring id %d stop - no current vgpu\n", ring_id);
		goto out;
	}

	if (scheduler->need_reschedule) {
		gvt_dbg_sched("ring id %d stop - will reschedule\n", ring_id);
		goto out;
	}

	if (list_empty(workload_q_head(scheduler->current_vgpu, ring_id))) {
		gvt_dbg_sched("ring id %d stop - no available workload\n",
				ring_id);
		goto out;
	}

	/*
	 * still have current workload, maybe the workload disptacher
	 * fail to submit it for some reason, resubmit it.
	 */
	if (scheduler->current_workload[ring_id]) {
		workload = scheduler->current_workload[ring_id];
		gvt_dbg_sched("ring id %d still have current workload %p\n",
				ring_id, workload);
		goto out;
	}

	/*
	 * pick a workload as current workload
	 * once current workload is set, schedule policy routines
	 * will wait the current workload is finished when trying to
	 * schedule out a vgpu.
	 */
	scheduler->current_workload[ring_id] = container_of(
			workload_q_head(scheduler->current_vgpu, ring_id)->next,
			struct intel_vgpu_workload, list);

	workload = scheduler->current_workload[ring_id];

	gvt_dbg_sched("ring id %d pick new workload %p\n", ring_id, workload);

	atomic_inc(&workload->vgpu->running_workload_num);
out:
	mutex_unlock(&gvt->lock);
	return workload;
}

static void update_guest_context(struct intel_vgpu_workload *workload)
{
	struct intel_vgpu *vgpu = workload->vgpu;
	struct intel_gvt *gvt = vgpu->gvt;
	int ring_id = workload->ring_id;
	struct i915_gem_context *shadow_ctx = workload->vgpu->shadow_ctx;
	struct drm_i915_gem_object *ctx_obj =
		shadow_ctx->engine[ring_id].state->obj;
	struct execlist_ring_context *shadow_ring_context;
	struct page *page;
	void *src;
	unsigned long context_gpa, context_page_num;
	int i;

	gvt_dbg_sched("ring id %d workload lrca %x\n", ring_id,
			workload->ctx_desc.lrca);

	context_page_num = intel_lr_context_size(
302
			gvt->dev_priv->engine[ring_id]);
Z
Zhi Wang 已提交
303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356

	context_page_num = context_page_num >> PAGE_SHIFT;

	if (IS_BROADWELL(gvt->dev_priv) && ring_id == RCS)
		context_page_num = 19;

	i = 2;

	while (i < context_page_num) {
		context_gpa = intel_vgpu_gma_to_gpa(vgpu->gtt.ggtt_mm,
				(u32)((workload->ctx_desc.lrca + i) <<
					GTT_PAGE_SHIFT));
		if (context_gpa == INTEL_GVT_INVALID_ADDR) {
			gvt_err("invalid guest context descriptor\n");
			return;
		}

		page = i915_gem_object_get_page(ctx_obj, LRC_PPHWSP_PN + i);
		src = kmap_atomic(page);
		intel_gvt_hypervisor_write_gpa(vgpu, context_gpa, src,
				GTT_PAGE_SIZE);
		kunmap_atomic(src);
		i++;
	}

	intel_gvt_hypervisor_write_gpa(vgpu, workload->ring_context_gpa +
		RING_CTX_OFF(ring_header.val), &workload->rb_tail, 4);

	page = i915_gem_object_get_page(ctx_obj, LRC_STATE_PN);
	shadow_ring_context = kmap_atomic(page);

#define COPY_REG(name) \
	intel_gvt_hypervisor_write_gpa(vgpu, workload->ring_context_gpa + \
		RING_CTX_OFF(name.val), &shadow_ring_context->name.val, 4)

	COPY_REG(ctx_ctrl);
	COPY_REG(ctx_timestamp);

#undef COPY_REG

	intel_gvt_hypervisor_write_gpa(vgpu,
			workload->ring_context_gpa +
			sizeof(*shadow_ring_context),
			(void *)shadow_ring_context +
			sizeof(*shadow_ring_context),
			GTT_PAGE_SIZE - sizeof(*shadow_ring_context));

	kunmap_atomic(shadow_ring_context);
}

static void complete_current_workload(struct intel_gvt *gvt, int ring_id)
{
	struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
	struct intel_vgpu_workload *workload;
Z
Zhi Wang 已提交
357
	int event;
Z
Zhi Wang 已提交
358 359 360 361 362 363 364 365 366 367

	mutex_lock(&gvt->lock);

	workload = scheduler->current_workload[ring_id];

	if (!workload->status && !workload->vgpu->resetting) {
		wait_event(workload->shadow_ctx_status_wq,
			   !atomic_read(&workload->shadow_ctx_active));

		update_guest_context(workload);
Z
Zhi Wang 已提交
368 369 370 371 372

		for_each_set_bit(event, workload->pending_events,
				 INTEL_GVT_EVENT_MAX)
			intel_vgpu_trigger_virtual_event(workload->vgpu,
					event);
Z
Zhi Wang 已提交
373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393
	}

	gvt_dbg_sched("ring id %d complete workload %p status %d\n",
			ring_id, workload, workload->status);

	scheduler->current_workload[ring_id] = NULL;

	atomic_dec(&workload->vgpu->running_workload_num);

	list_del_init(&workload->list);
	workload->complete(workload);

	wake_up(&scheduler->workload_complete_wq);
	mutex_unlock(&gvt->lock);
}

struct workload_thread_param {
	struct intel_gvt *gvt;
	int ring_id;
};

394 395
static DEFINE_MUTEX(scheduler_mutex);

Z
Zhi Wang 已提交
396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419
static int workload_thread(void *priv)
{
	struct workload_thread_param *p = (struct workload_thread_param *)priv;
	struct intel_gvt *gvt = p->gvt;
	int ring_id = p->ring_id;
	struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
	struct intel_vgpu_workload *workload = NULL;
	int ret;
	bool need_force_wake = IS_SKYLAKE(gvt->dev_priv);

	kfree(p);

	gvt_dbg_core("workload thread for ring %d started\n", ring_id);

	while (!kthread_should_stop()) {
		ret = wait_event_interruptible(scheduler->waitq[ring_id],
				kthread_should_stop() ||
				(workload = pick_next_workload(gvt, ring_id)));

		WARN_ON_ONCE(ret);

		if (kthread_should_stop())
			break;

420 421
		mutex_lock(&scheduler_mutex);

Z
Zhi Wang 已提交
422 423 424 425 426 427 428 429 430 431 432 433 434
		gvt_dbg_sched("ring id %d next workload %p vgpu %d\n",
				workload->ring_id, workload,
				workload->vgpu->id);

		intel_runtime_pm_get(gvt->dev_priv);

		gvt_dbg_sched("ring id %d will dispatch workload %p\n",
				workload->ring_id, workload);

		if (need_force_wake)
			intel_uncore_forcewake_get(gvt->dev_priv,
					FORCEWAKE_ALL);

435
		mutex_lock(&gvt->dev_priv->drm.struct_mutex);
Z
Zhi Wang 已提交
436
		ret = dispatch_workload(workload);
437 438
		mutex_unlock(&gvt->dev_priv->drm.struct_mutex);

Z
Zhi Wang 已提交
439 440 441 442 443 444 445 446 447
		if (ret) {
			gvt_err("fail to dispatch workload, skip\n");
			goto complete;
		}

		gvt_dbg_sched("ring id %d wait workload %p\n",
				workload->ring_id, workload);

		workload->status = i915_wait_request(workload->req,
448
						     0, NULL, NULL);
Z
Zhi Wang 已提交
449 450 451 452 453 454 455
		if (workload->status != 0)
			gvt_err("fail to wait workload, skip\n");

complete:
		gvt_dbg_sched("will complete workload %p\n, status: %d\n",
				workload, workload->status);

456
		mutex_lock(&gvt->dev_priv->drm.struct_mutex);
Z
Zhi Wang 已提交
457
		complete_current_workload(gvt, ring_id);
458
		mutex_unlock(&gvt->dev_priv->drm.struct_mutex);
Z
Zhi Wang 已提交
459

460 461
		i915_gem_request_put(fetch_and_zero(&workload->req));

Z
Zhi Wang 已提交
462 463 464 465 466
		if (need_force_wake)
			intel_uncore_forcewake_put(gvt->dev_priv,
					FORCEWAKE_ALL);

		intel_runtime_pm_put(gvt->dev_priv);
467 468 469

		mutex_unlock(&scheduler_mutex);

Z
Zhi Wang 已提交
470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513
	}
	return 0;
}

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

	if (atomic_read(&vgpu->running_workload_num)) {
		gvt_dbg_sched("wait vgpu idle\n");

		wait_event(scheduler->workload_complete_wq,
				!atomic_read(&vgpu->running_workload_num));
	}
}

void intel_gvt_clean_workload_scheduler(struct intel_gvt *gvt)
{
	struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
	int i;

	gvt_dbg_core("clean workload scheduler\n");

	for (i = 0; i < I915_NUM_ENGINES; i++) {
		if (scheduler->thread[i]) {
			kthread_stop(scheduler->thread[i]);
			scheduler->thread[i] = NULL;
		}
	}
}

int intel_gvt_init_workload_scheduler(struct intel_gvt *gvt)
{
	struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
	struct workload_thread_param *param = NULL;
	int ret;
	int i;

	gvt_dbg_core("init workload scheduler\n");

	init_waitqueue_head(&scheduler->workload_complete_wq);

	for (i = 0; i < I915_NUM_ENGINES; i++) {
514 515 516 517
		/* check ring mask at init time */
		if (!HAS_ENGINE(gvt->dev_priv, i))
			continue;

Z
Zhi Wang 已提交
518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578
		init_waitqueue_head(&scheduler->waitq[i]);

		param = kzalloc(sizeof(*param), GFP_KERNEL);
		if (!param) {
			ret = -ENOMEM;
			goto err;
		}

		param->gvt = gvt;
		param->ring_id = i;

		scheduler->thread[i] = kthread_run(workload_thread, param,
			"gvt workload %d", i);
		if (IS_ERR(scheduler->thread[i])) {
			gvt_err("fail to create workload thread\n");
			ret = PTR_ERR(scheduler->thread[i]);
			goto err;
		}
	}
	return 0;
err:
	intel_gvt_clean_workload_scheduler(gvt);
	kfree(param);
	param = NULL;
	return ret;
}

void intel_vgpu_clean_gvt_context(struct intel_vgpu *vgpu)
{
	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;

	atomic_notifier_chain_unregister(&vgpu->shadow_ctx->status_notifier,
			&vgpu->shadow_ctx_notifier_block);

	mutex_lock(&dev_priv->drm.struct_mutex);

	/* a little hacky to mark as ctx closed */
	vgpu->shadow_ctx->closed = true;
	i915_gem_context_put(vgpu->shadow_ctx);

	mutex_unlock(&dev_priv->drm.struct_mutex);
}

int intel_vgpu_init_gvt_context(struct intel_vgpu *vgpu)
{
	atomic_set(&vgpu->running_workload_num, 0);

	vgpu->shadow_ctx = i915_gem_context_create_gvt(
			&vgpu->gvt->dev_priv->drm);
	if (IS_ERR(vgpu->shadow_ctx))
		return PTR_ERR(vgpu->shadow_ctx);

	vgpu->shadow_ctx->engine[RCS].initialised = true;

	vgpu->shadow_ctx_notifier_block.notifier_call =
		shadow_context_status_change;

	atomic_notifier_chain_register(&vgpu->shadow_ctx->status_notifier,
				       &vgpu->shadow_ctx_notifier_block);
	return 0;
}