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1/*
2 * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 * Zhiyuan Lv <zhiyuan.lv@intel.com>
25 * Zhi Wang <zhi.a.wang@intel.com>
26 *
27 * Contributors:
28 * Min He <min.he@intel.com>
29 * Bing Niu <bing.niu@intel.com>
30 * Ping Gao <ping.a.gao@intel.com>
31 * Tina Zhang <tina.zhang@intel.com>
32 *
33 */
34
35#include "i915_drv.h"
36#include "gvt.h"
37
38#define _EL_OFFSET_STATUS 0x234
39#define _EL_OFFSET_STATUS_BUF 0x370
40#define _EL_OFFSET_STATUS_PTR 0x3A0
41
42#define execlist_ring_mmio(gvt, ring_id, offset) \
43 (gvt->dev_priv->engine[ring_id]->mmio_base + (offset))
44
45#define valid_context(ctx) ((ctx)->valid)
46#define same_context(a, b) (((a)->context_id == (b)->context_id) && \
47 ((a)->lrca == (b)->lrca))
48
49static int context_switch_events[] = {
50 [RCS] = RCS_AS_CONTEXT_SWITCH,
51 [BCS] = BCS_AS_CONTEXT_SWITCH,
52 [VCS] = VCS_AS_CONTEXT_SWITCH,
53 [VCS2] = VCS2_AS_CONTEXT_SWITCH,
54 [VECS] = VECS_AS_CONTEXT_SWITCH,
55};
56
57static int ring_id_to_context_switch_event(int ring_id)
58{
59 if (WARN_ON(ring_id < RCS ||
60 ring_id >= ARRAY_SIZE(context_switch_events)))
61 return -EINVAL;
62
63 return context_switch_events[ring_id];
64}
65
66static void switch_virtual_execlist_slot(struct intel_vgpu_execlist *execlist)
67{
68 gvt_dbg_el("[before] running slot %d/context %x pending slot %d\n",
69 execlist->running_slot ?
70 execlist->running_slot->index : -1,
71 execlist->running_context ?
72 execlist->running_context->context_id : 0,
73 execlist->pending_slot ?
74 execlist->pending_slot->index : -1);
75
76 execlist->running_slot = execlist->pending_slot;
77 execlist->pending_slot = NULL;
78 execlist->running_context = execlist->running_context ?
79 &execlist->running_slot->ctx[0] : NULL;
80
81 gvt_dbg_el("[after] running slot %d/context %x pending slot %d\n",
82 execlist->running_slot ?
83 execlist->running_slot->index : -1,
84 execlist->running_context ?
85 execlist->running_context->context_id : 0,
86 execlist->pending_slot ?
87 execlist->pending_slot->index : -1);
88}
89
90static void emulate_execlist_status(struct intel_vgpu_execlist *execlist)
91{
92 struct intel_vgpu_execlist_slot *running = execlist->running_slot;
93 struct intel_vgpu_execlist_slot *pending = execlist->pending_slot;
94 struct execlist_ctx_descriptor_format *desc = execlist->running_context;
95 struct intel_vgpu *vgpu = execlist->vgpu;
96 struct execlist_status_format status;
97 int ring_id = execlist->ring_id;
98 u32 status_reg = execlist_ring_mmio(vgpu->gvt,
99 ring_id, _EL_OFFSET_STATUS);
100
101 status.ldw = vgpu_vreg(vgpu, status_reg);
102 status.udw = vgpu_vreg(vgpu, status_reg + 4);
103
104 if (running) {
105 status.current_execlist_pointer = !!running->index;
106 status.execlist_write_pointer = !!!running->index;
107 status.execlist_0_active = status.execlist_0_valid =
108 !!!(running->index);
109 status.execlist_1_active = status.execlist_1_valid =
110 !!(running->index);
111 } else {
112 status.context_id = 0;
113 status.execlist_0_active = status.execlist_0_valid = 0;
114 status.execlist_1_active = status.execlist_1_valid = 0;
115 }
116
117 status.context_id = desc ? desc->context_id : 0;
118 status.execlist_queue_full = !!(pending);
119
120 vgpu_vreg(vgpu, status_reg) = status.ldw;
121 vgpu_vreg(vgpu, status_reg + 4) = status.udw;
122
123 gvt_dbg_el("vgpu%d: status reg offset %x ldw %x udw %x\n",
124 vgpu->id, status_reg, status.ldw, status.udw);
125}
126
127static void emulate_csb_update(struct intel_vgpu_execlist *execlist,
128 struct execlist_context_status_format *status,
129 bool trigger_interrupt_later)
130{
131 struct intel_vgpu *vgpu = execlist->vgpu;
132 int ring_id = execlist->ring_id;
133 struct execlist_context_status_pointer_format ctx_status_ptr;
134 u32 write_pointer;
135 u32 ctx_status_ptr_reg, ctx_status_buf_reg, offset;
136 unsigned long hwsp_gpa;
137 struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
138
139 ctx_status_ptr_reg = execlist_ring_mmio(vgpu->gvt, ring_id,
140 _EL_OFFSET_STATUS_PTR);
141 ctx_status_buf_reg = execlist_ring_mmio(vgpu->gvt, ring_id,
142 _EL_OFFSET_STATUS_BUF);
143
144 ctx_status_ptr.dw = vgpu_vreg(vgpu, ctx_status_ptr_reg);
145
146 write_pointer = ctx_status_ptr.write_ptr;
147
148 if (write_pointer == 0x7)
149 write_pointer = 0;
150 else {
151 ++write_pointer;
152 write_pointer %= 0x6;
153 }
154
155 offset = ctx_status_buf_reg + write_pointer * 8;
156
157 vgpu_vreg(vgpu, offset) = status->ldw;
158 vgpu_vreg(vgpu, offset + 4) = status->udw;
159
160 ctx_status_ptr.write_ptr = write_pointer;
161 vgpu_vreg(vgpu, ctx_status_ptr_reg) = ctx_status_ptr.dw;
162
163 /* Update the CSB and CSB write pointer in HWSP */
164 hwsp_gpa = intel_vgpu_gma_to_gpa(vgpu->gtt.ggtt_mm,
165 vgpu->hws_pga[ring_id]);
166 if (hwsp_gpa != INTEL_GVT_INVALID_ADDR) {
167 intel_gvt_hypervisor_write_gpa(vgpu,
168 hwsp_gpa + I915_HWS_CSB_BUF0_INDEX * 4 +
169 write_pointer * 8,
170 status, 8);
171 intel_gvt_hypervisor_write_gpa(vgpu,
172 hwsp_gpa +
173 intel_hws_csb_write_index(dev_priv) * 4,
174 &write_pointer, 4);
175 }
176
177 gvt_dbg_el("vgpu%d: w pointer %u reg %x csb l %x csb h %x\n",
178 vgpu->id, write_pointer, offset, status->ldw, status->udw);
179
180 if (trigger_interrupt_later)
181 return;
182
183 intel_vgpu_trigger_virtual_event(vgpu,
184 ring_id_to_context_switch_event(execlist->ring_id));
185}
186
187static int emulate_execlist_ctx_schedule_out(
188 struct intel_vgpu_execlist *execlist,
189 struct execlist_ctx_descriptor_format *ctx)
190{
191 struct intel_vgpu *vgpu = execlist->vgpu;
192 struct intel_vgpu_execlist_slot *running = execlist->running_slot;
193 struct intel_vgpu_execlist_slot *pending = execlist->pending_slot;
194 struct execlist_ctx_descriptor_format *ctx0 = &running->ctx[0];
195 struct execlist_ctx_descriptor_format *ctx1 = &running->ctx[1];
196 struct execlist_context_status_format status;
197
198 memset(&status, 0, sizeof(status));
199
200 gvt_dbg_el("schedule out context id %x\n", ctx->context_id);
201
202 if (WARN_ON(!same_context(ctx, execlist->running_context))) {
203 gvt_vgpu_err("schedule out context is not running context,"
204 "ctx id %x running ctx id %x\n",
205 ctx->context_id,
206 execlist->running_context->context_id);
207 return -EINVAL;
208 }
209
210 /* ctx1 is valid, ctx0/ctx is scheduled-out -> element switch */
211 if (valid_context(ctx1) && same_context(ctx0, ctx)) {
212 gvt_dbg_el("ctx 1 valid, ctx/ctx 0 is scheduled-out\n");
213
214 execlist->running_context = ctx1;
215
216 emulate_execlist_status(execlist);
217
218 status.context_complete = status.element_switch = 1;
219 status.context_id = ctx->context_id;
220
221 emulate_csb_update(execlist, &status, false);
222 /*
223 * ctx1 is not valid, ctx == ctx0
224 * ctx1 is valid, ctx1 == ctx
225 * --> last element is finished
226 * emulate:
227 * active-to-idle if there is *no* pending execlist
228 * context-complete if there *is* pending execlist
229 */
230 } else if ((!valid_context(ctx1) && same_context(ctx0, ctx))
231 || (valid_context(ctx1) && same_context(ctx1, ctx))) {
232 gvt_dbg_el("need to switch virtual execlist slot\n");
233
234 switch_virtual_execlist_slot(execlist);
235
236 emulate_execlist_status(execlist);
237
238 status.context_complete = status.active_to_idle = 1;
239 status.context_id = ctx->context_id;
240
241 if (!pending) {
242 emulate_csb_update(execlist, &status, false);
243 } else {
244 emulate_csb_update(execlist, &status, true);
245
246 memset(&status, 0, sizeof(status));
247
248 status.idle_to_active = 1;
249 status.context_id = 0;
250
251 emulate_csb_update(execlist, &status, false);
252 }
253 } else {
254 WARN_ON(1);
255 return -EINVAL;
256 }
257
258 return 0;
259}
260
261static struct intel_vgpu_execlist_slot *get_next_execlist_slot(
262 struct intel_vgpu_execlist *execlist)
263{
264 struct intel_vgpu *vgpu = execlist->vgpu;
265 int ring_id = execlist->ring_id;
266 u32 status_reg = execlist_ring_mmio(vgpu->gvt, ring_id,
267 _EL_OFFSET_STATUS);
268 struct execlist_status_format status;
269
270 status.ldw = vgpu_vreg(vgpu, status_reg);
271 status.udw = vgpu_vreg(vgpu, status_reg + 4);
272
273 if (status.execlist_queue_full) {
274 gvt_vgpu_err("virtual execlist slots are full\n");
275 return NULL;
276 }
277
278 return &execlist->slot[status.execlist_write_pointer];
279}
280
281static int emulate_execlist_schedule_in(struct intel_vgpu_execlist *execlist,
282 struct execlist_ctx_descriptor_format ctx[2])
283{
284 struct intel_vgpu_execlist_slot *running = execlist->running_slot;
285 struct intel_vgpu_execlist_slot *slot =
286 get_next_execlist_slot(execlist);
287
288 struct execlist_ctx_descriptor_format *ctx0, *ctx1;
289 struct execlist_context_status_format status;
290 struct intel_vgpu *vgpu = execlist->vgpu;
291
292 gvt_dbg_el("emulate schedule-in\n");
293
294 if (!slot) {
295 gvt_vgpu_err("no available execlist slot\n");
296 return -EINVAL;
297 }
298
299 memset(&status, 0, sizeof(status));
300 memset(slot->ctx, 0, sizeof(slot->ctx));
301
302 slot->ctx[0] = ctx[0];
303 slot->ctx[1] = ctx[1];
304
305 gvt_dbg_el("alloc slot index %d ctx 0 %x ctx 1 %x\n",
306 slot->index, ctx[0].context_id,
307 ctx[1].context_id);
308
309 /*
310 * no running execlist, make this write bundle as running execlist
311 * -> idle-to-active
312 */
313 if (!running) {
314 gvt_dbg_el("no current running execlist\n");
315
316 execlist->running_slot = slot;
317 execlist->pending_slot = NULL;
318 execlist->running_context = &slot->ctx[0];
319
320 gvt_dbg_el("running slot index %d running context %x\n",
321 execlist->running_slot->index,
322 execlist->running_context->context_id);
323
324 emulate_execlist_status(execlist);
325
326 status.idle_to_active = 1;
327 status.context_id = 0;
328
329 emulate_csb_update(execlist, &status, false);
330 return 0;
331 }
332
333 ctx0 = &running->ctx[0];
334 ctx1 = &running->ctx[1];
335
336 gvt_dbg_el("current running slot index %d ctx 0 %x ctx 1 %x\n",
337 running->index, ctx0->context_id, ctx1->context_id);
338
339 /*
340 * already has an running execlist
341 * a. running ctx1 is valid,
342 * ctx0 is finished, and running ctx1 == new execlist ctx[0]
343 * b. running ctx1 is not valid,
344 * ctx0 == new execlist ctx[0]
345 * ----> lite-restore + preempted
346 */
347 if ((valid_context(ctx1) && same_context(ctx1, &slot->ctx[0]) &&
348 /* condition a */
349 (!same_context(ctx0, execlist->running_context))) ||
350 (!valid_context(ctx1) &&
351 same_context(ctx0, &slot->ctx[0]))) { /* condition b */
352 gvt_dbg_el("need to switch virtual execlist slot\n");
353
354 execlist->pending_slot = slot;
355 switch_virtual_execlist_slot(execlist);
356
357 emulate_execlist_status(execlist);
358
359 status.lite_restore = status.preempted = 1;
360 status.context_id = ctx[0].context_id;
361
362 emulate_csb_update(execlist, &status, false);
363 } else {
364 gvt_dbg_el("emulate as pending slot\n");
365 /*
366 * otherwise
367 * --> emulate pending execlist exist + but no preemption case
368 */
369 execlist->pending_slot = slot;
370 emulate_execlist_status(execlist);
371 }
372 return 0;
373}
374
375#define get_desc_from_elsp_dwords(ed, i) \
376 ((struct execlist_ctx_descriptor_format *)&((ed)->data[i * 2]))
377
378static int prepare_execlist_workload(struct intel_vgpu_workload *workload)
379{
380 struct intel_vgpu *vgpu = workload->vgpu;
381 struct intel_vgpu_submission *s = &vgpu->submission;
382 struct execlist_ctx_descriptor_format ctx[2];
383 int ring_id = workload->ring_id;
384 int ret;
385
386 if (!workload->emulate_schedule_in)
387 return 0;
388
389 ctx[0] = *get_desc_from_elsp_dwords(&workload->elsp_dwords, 0);
390 ctx[1] = *get_desc_from_elsp_dwords(&workload->elsp_dwords, 1);
391
392 ret = emulate_execlist_schedule_in(&s->execlist[ring_id], ctx);
393 if (ret) {
394 gvt_vgpu_err("fail to emulate execlist schedule in\n");
395 return ret;
396 }
397 return 0;
398}
399
400static int complete_execlist_workload(struct intel_vgpu_workload *workload)
401{
402 struct intel_vgpu *vgpu = workload->vgpu;
403 int ring_id = workload->ring_id;
404 struct intel_vgpu_submission *s = &vgpu->submission;
405 struct intel_vgpu_execlist *execlist = &s->execlist[ring_id];
406 struct intel_vgpu_workload *next_workload;
407 struct list_head *next = workload_q_head(vgpu, ring_id)->next;
408 bool lite_restore = false;
409 int ret = 0;
410
411 gvt_dbg_el("complete workload %p status %d\n", workload,
412 workload->status);
413
414 if (workload->status || (vgpu->resetting_eng & ENGINE_MASK(ring_id)))
415 goto out;
416
417 if (!list_empty(workload_q_head(vgpu, ring_id))) {
418 struct execlist_ctx_descriptor_format *this_desc, *next_desc;
419
420 next_workload = container_of(next,
421 struct intel_vgpu_workload, list);
422 this_desc = &workload->ctx_desc;
423 next_desc = &next_workload->ctx_desc;
424
425 lite_restore = same_context(this_desc, next_desc);
426 }
427
428 if (lite_restore) {
429 gvt_dbg_el("next context == current - no schedule-out\n");
430 goto out;
431 }
432
433 ret = emulate_execlist_ctx_schedule_out(execlist, &workload->ctx_desc);
434out:
435 intel_vgpu_unpin_mm(workload->shadow_mm);
436 intel_vgpu_destroy_workload(workload);
437 return ret;
438}
439
440static int submit_context(struct intel_vgpu *vgpu, int ring_id,
441 struct execlist_ctx_descriptor_format *desc,
442 bool emulate_schedule_in)
443{
444 struct intel_vgpu_submission *s = &vgpu->submission;
445 struct intel_vgpu_workload *workload = NULL;
446
447 workload = intel_vgpu_create_workload(vgpu, ring_id, desc);
448 if (IS_ERR(workload))
449 return PTR_ERR(workload);
450
451 workload->prepare = prepare_execlist_workload;
452 workload->complete = complete_execlist_workload;
453 workload->emulate_schedule_in = emulate_schedule_in;
454
455 if (emulate_schedule_in)
456 workload->elsp_dwords = s->execlist[ring_id].elsp_dwords;
457
458 gvt_dbg_el("workload %p emulate schedule_in %d\n", workload,
459 emulate_schedule_in);
460
461 intel_vgpu_queue_workload(workload);
462 return 0;
463}
464
465int intel_vgpu_submit_execlist(struct intel_vgpu *vgpu, int ring_id)
466{
467 struct intel_vgpu_submission *s = &vgpu->submission;
468 struct intel_vgpu_execlist *execlist = &s->execlist[ring_id];
469 struct execlist_ctx_descriptor_format *desc[2];
470 int i, ret;
471
472 desc[0] = get_desc_from_elsp_dwords(&execlist->elsp_dwords, 0);
473 desc[1] = get_desc_from_elsp_dwords(&execlist->elsp_dwords, 1);
474
475 if (!desc[0]->valid) {
476 gvt_vgpu_err("invalid elsp submission, desc0 is invalid\n");
477 goto inv_desc;
478 }
479
480 for (i = 0; i < ARRAY_SIZE(desc); i++) {
481 if (!desc[i]->valid)
482 continue;
483 if (!desc[i]->privilege_access) {
484 gvt_vgpu_err("unexpected GGTT elsp submission\n");
485 goto inv_desc;
486 }
487 }
488
489 /* submit workload */
490 for (i = 0; i < ARRAY_SIZE(desc); i++) {
491 if (!desc[i]->valid)
492 continue;
493 ret = submit_context(vgpu, ring_id, desc[i], i == 0);
494 if (ret) {
495 gvt_vgpu_err("failed to submit desc %d\n", i);
496 return ret;
497 }
498 }
499
500 return 0;
501
502inv_desc:
503 gvt_vgpu_err("descriptors content: desc0 %08x %08x desc1 %08x %08x\n",
504 desc[0]->udw, desc[0]->ldw, desc[1]->udw, desc[1]->ldw);
505 return -EINVAL;
506}
507
508static void init_vgpu_execlist(struct intel_vgpu *vgpu, int ring_id)
509{
510 struct intel_vgpu_submission *s = &vgpu->submission;
511 struct intel_vgpu_execlist *execlist = &s->execlist[ring_id];
512 struct execlist_context_status_pointer_format ctx_status_ptr;
513 u32 ctx_status_ptr_reg;
514
515 memset(execlist, 0, sizeof(*execlist));
516
517 execlist->vgpu = vgpu;
518 execlist->ring_id = ring_id;
519 execlist->slot[0].index = 0;
520 execlist->slot[1].index = 1;
521
522 ctx_status_ptr_reg = execlist_ring_mmio(vgpu->gvt, ring_id,
523 _EL_OFFSET_STATUS_PTR);
524 ctx_status_ptr.dw = vgpu_vreg(vgpu, ctx_status_ptr_reg);
525 ctx_status_ptr.read_ptr = 0;
526 ctx_status_ptr.write_ptr = 0x7;
527 vgpu_vreg(vgpu, ctx_status_ptr_reg) = ctx_status_ptr.dw;
528}
529
530static void clean_execlist(struct intel_vgpu *vgpu, unsigned long engine_mask)
531{
532 unsigned int tmp;
533 struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
534 struct intel_engine_cs *engine;
535 struct intel_vgpu_submission *s = &vgpu->submission;
536
537 for_each_engine_masked(engine, dev_priv, engine_mask, tmp) {
538 kfree(s->ring_scan_buffer[engine->id]);
539 s->ring_scan_buffer[engine->id] = NULL;
540 s->ring_scan_buffer_size[engine->id] = 0;
541 }
542}
543
544static void reset_execlist(struct intel_vgpu *vgpu,
545 unsigned long engine_mask)
546{
547 struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
548 struct intel_engine_cs *engine;
549 unsigned int tmp;
550
551 for_each_engine_masked(engine, dev_priv, engine_mask, tmp)
552 init_vgpu_execlist(vgpu, engine->id);
553}
554
555static int init_execlist(struct intel_vgpu *vgpu,
556 unsigned long engine_mask)
557{
558 reset_execlist(vgpu, engine_mask);
559 return 0;
560}
561
562const struct intel_vgpu_submission_ops intel_vgpu_execlist_submission_ops = {
563 .name = "execlist",
564 .init = init_execlist,
565 .reset = reset_execlist,
566 .clean = clean_execlist,
567};