drivers/gpu/drm/i915/gvt/scheduler.c

   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  *    Zhi Wang <zhi.a.wang@intel.com>
  25  *
  26  * Contributors:
  27  *    Ping Gao <ping.a.gao@intel.com>
  28  *    Tina Zhang <tina.zhang@intel.com>
  29  *    Chanbin Du <changbin.du@intel.com>
  30  *    Min He <min.he@intel.com>
  31  *    Bing Niu <bing.niu@intel.com>
  32  *    Zhenyu Wang <zhenyuw@linux.intel.com>
  33  *
  34  */
  35
  36 #include <linux/kthread.h>
  37
  38 #include "gem/i915_gem_pm.h"
  39 #include "gt/intel_context.h"
  40 #include "gt/intel_execlists_submission.h"
  41 #include "gt/intel_gt_regs.h"
  42 #include "gt/intel_lrc.h"
  43 #include "gt/intel_ring.h"
  44
  45 #include "i915_drv.h"
  46 #include "i915_gem_gtt.h"
  47 #include "i915_perf_oa_regs.h"
  48 #include "gvt.h"
  49
  50 #define RING_CTX_OFF(x) \
  51         offsetof(struct execlist_ring_context, x)
  52
  53 static void set_context_pdp_root_pointer(
  54                 struct execlist_ring_context *ring_context,
  55                 u32 pdp[8])
  56 {
  57         int i;
  58
  59         for (i = 0; i < 8; i++)
  60                 ring_context->pdps[i].val = pdp[7 - i];
  61 }
  62
  63 static void update_shadow_pdps(struct intel_vgpu_workload *workload)
  64 {
  65         struct execlist_ring_context *shadow_ring_context;
  66         struct intel_context *ctx = workload->req->context;
  67
  68         if (WARN_ON(!workload->shadow_mm))
  69                 return;
  70
  71         if (WARN_ON(!atomic_read(&workload->shadow_mm->pincount)))
  72                 return;
  73
  74         shadow_ring_context = (struct execlist_ring_context *)ctx->lrc_reg_state;
  75         set_context_pdp_root_pointer(shadow_ring_context,
  76                         (void *)workload->shadow_mm->ppgtt_mm.shadow_pdps);
  77 }
  78
  79 /*
  80  * when populating shadow ctx from guest, we should not overrride oa related
  81  * registers, so that they will not be overlapped by guest oa configs. Thus
  82  * made it possible to capture oa data from host for both host and guests.
  83  */
  84 static void sr_oa_regs(struct intel_vgpu_workload *workload,
  85                 u32 *reg_state, bool save)
  86 {
  87         struct drm_i915_private *dev_priv = workload->vgpu->gvt->gt->i915;
  88         u32 ctx_oactxctrl = dev_priv->perf.ctx_oactxctrl_offset;
  89         u32 ctx_flexeu0 = dev_priv->perf.ctx_flexeu0_offset;
  90         int i = 0;
  91         u32 flex_mmio[] = {
  92                 i915_mmio_reg_offset(EU_PERF_CNTL0),
  93                 i915_mmio_reg_offset(EU_PERF_CNTL1),
  94                 i915_mmio_reg_offset(EU_PERF_CNTL2),
  95                 i915_mmio_reg_offset(EU_PERF_CNTL3),
  96                 i915_mmio_reg_offset(EU_PERF_CNTL4),
  97                 i915_mmio_reg_offset(EU_PERF_CNTL5),
  98                 i915_mmio_reg_offset(EU_PERF_CNTL6),
  99         };
 100
 101         if (workload->engine->id != RCS0)
 102                 return;
 103
 104         if (save) {
 105                 workload->oactxctrl = reg_state[ctx_oactxctrl + 1];
 106
 107                 for (i = 0; i < ARRAY_SIZE(workload->flex_mmio); i++) {
 108                         u32 state_offset = ctx_flexeu0 + i * 2;
 109
 110                         workload->flex_mmio[i] = reg_state[state_offset + 1];
 111                 }
 112         } else {
 113                 reg_state[ctx_oactxctrl] =
 114                         i915_mmio_reg_offset(GEN8_OACTXCONTROL);
 115                 reg_state[ctx_oactxctrl + 1] = workload->oactxctrl;
 116
 117                 for (i = 0; i < ARRAY_SIZE(workload->flex_mmio); i++) {
 118                         u32 state_offset = ctx_flexeu0 + i * 2;
 119                         u32 mmio = flex_mmio[i];
 120
 121                         reg_state[state_offset] = mmio;
 122                         reg_state[state_offset + 1] = workload->flex_mmio[i];
 123                 }
 124         }
 125 }
 126
 127 static int populate_shadow_context(struct intel_vgpu_workload *workload)
 128 {
 129         struct intel_vgpu *vgpu = workload->vgpu;
 130         struct intel_gvt *gvt = vgpu->gvt;
 131         struct intel_context *ctx = workload->req->context;
 132         struct execlist_ring_context *shadow_ring_context;
 133         void *dst;
 134         void *context_base;
 135         unsigned long context_gpa, context_page_num;
 136         unsigned long gpa_base; /* first gpa of consecutive GPAs */
 137         unsigned long gpa_size; /* size of consecutive GPAs */
 138         struct intel_vgpu_submission *s = &vgpu->submission;
 139         int i;
 140         bool skip = false;
 141         int ring_id = workload->engine->id;
 142         int ret;
 143
 144         GEM_BUG_ON(!intel_context_is_pinned(ctx));
 145
 146         context_base = (void *) ctx->lrc_reg_state -
 147                                 (LRC_STATE_PN << I915_GTT_PAGE_SHIFT);
 148
 149         shadow_ring_context = (void *) ctx->lrc_reg_state;
 150
 151         sr_oa_regs(workload, (u32 *)shadow_ring_context, true);
 152 #define COPY_REG(name) \
 153         intel_gvt_read_gpa(vgpu, workload->ring_context_gpa \
 154                 + RING_CTX_OFF(name.val), &shadow_ring_context->name.val, 4)
 155 #define COPY_REG_MASKED(name) {\
 156                 intel_gvt_read_gpa(vgpu, workload->ring_context_gpa \
 157                                               + RING_CTX_OFF(name.val),\
 158                                               &shadow_ring_context->name.val, 4);\
 159                 shadow_ring_context->name.val |= 0xffff << 16;\
 160         }
 161
 162         COPY_REG_MASKED(ctx_ctrl);
 163         COPY_REG(ctx_timestamp);
 164
 165         if (workload->engine->id == RCS0) {
 166                 COPY_REG(bb_per_ctx_ptr);
 167                 COPY_REG(rcs_indirect_ctx);
 168                 COPY_REG(rcs_indirect_ctx_offset);
 169         } else if (workload->engine->id == BCS0)
 170                 intel_gvt_read_gpa(vgpu,
 171                                 workload->ring_context_gpa +
 172                                 BCS_TILE_REGISTER_VAL_OFFSET,
 173                                 (void *)shadow_ring_context +
 174                                 BCS_TILE_REGISTER_VAL_OFFSET, 4);
 175 #undef COPY_REG
 176 #undef COPY_REG_MASKED
 177
 178         /* don't copy Ring Context (the first 0x50 dwords),
 179          * only copy the Engine Context part from guest
 180          */
 181         intel_gvt_read_gpa(vgpu,
 182                         workload->ring_context_gpa +
 183                         RING_CTX_SIZE,
 184                         (void *)shadow_ring_context +
 185                         RING_CTX_SIZE,
 186                         I915_GTT_PAGE_SIZE - RING_CTX_SIZE);
 187
 188         sr_oa_regs(workload, (u32 *)shadow_ring_context, false);
 189
 190         gvt_dbg_sched("ring %s workload lrca %x, ctx_id %x, ctx gpa %llx",
 191                         workload->engine->name, workload->ctx_desc.lrca,
 192                         workload->ctx_desc.context_id,
 193                         workload->ring_context_gpa);
 194
 195         /* only need to ensure this context is not pinned/unpinned during the
 196          * period from last submission to this this submission.
 197          * Upon reaching this function, the currently submitted context is not
 198          * supposed to get unpinned. If a misbehaving guest driver ever does
 199          * this, it would corrupt itself.
 200          */
 201         if (s->last_ctx[ring_id].valid &&
 202                         (s->last_ctx[ring_id].lrca ==
 203                                 workload->ctx_desc.lrca) &&
 204                         (s->last_ctx[ring_id].ring_context_gpa ==
 205                                 workload->ring_context_gpa))
 206                 skip = true;
 207
 208         s->last_ctx[ring_id].lrca = workload->ctx_desc.lrca;
 209         s->last_ctx[ring_id].ring_context_gpa = workload->ring_context_gpa;
 210
 211         if (IS_RESTORE_INHIBIT(shadow_ring_context->ctx_ctrl.val) || skip)
 212                 return 0;
 213
 214         s->last_ctx[ring_id].valid = false;
 215         context_page_num = workload->engine->context_size;
 216         context_page_num = context_page_num >> PAGE_SHIFT;
 217
 218         if (IS_BROADWELL(gvt->gt->i915) && workload->engine->id == RCS0)
 219                 context_page_num = 19;
 220
 221         /* find consecutive GPAs from gma until the first inconsecutive GPA.
 222          * read from the continuous GPAs into dst virtual address
 223          */
 224         gpa_size = 0;
 225         for (i = 2; i < context_page_num; i++) {
 226                 context_gpa = intel_vgpu_gma_to_gpa(vgpu->gtt.ggtt_mm,
 227                                 (u32)((workload->ctx_desc.lrca + i) <<
 228                                 I915_GTT_PAGE_SHIFT));
 229                 if (context_gpa == INTEL_GVT_INVALID_ADDR) {
 230                         gvt_vgpu_err("Invalid guest context descriptor\n");
 231                         return -EFAULT;
 232                 }
 233
 234                 if (gpa_size == 0) {
 235                         gpa_base = context_gpa;
 236                         dst = context_base + (i << I915_GTT_PAGE_SHIFT);
 237                 } else if (context_gpa != gpa_base + gpa_size)
 238                         goto read;
 239
 240                 gpa_size += I915_GTT_PAGE_SIZE;
 241
 242                 if (i == context_page_num - 1)
 243                         goto read;
 244
 245                 continue;
 246
 247 read:
 248                 intel_gvt_read_gpa(vgpu, gpa_base, dst, gpa_size);
 249                 gpa_base = context_gpa;
 250                 gpa_size = I915_GTT_PAGE_SIZE;
 251                 dst = context_base + (i << I915_GTT_PAGE_SHIFT);
 252         }
 253         ret = intel_gvt_scan_engine_context(workload);
 254         if (ret) {
 255                 gvt_vgpu_err("invalid cmd found in guest context pages\n");
 256                 return ret;
 257         }
 258         s->last_ctx[ring_id].valid = true;
 259         return 0;
 260 }
 261
 262 static inline bool is_gvt_request(struct i915_request *rq)
 263 {
 264         return intel_context_force_single_submission(rq->context);
 265 }
 266
 267 static void save_ring_hw_state(struct intel_vgpu *vgpu,
 268                                const struct intel_engine_cs *engine)
 269 {
 270         struct intel_uncore *uncore = engine->uncore;
 271         i915_reg_t reg;
 272
 273         reg = RING_INSTDONE(engine->mmio_base);
 274         vgpu_vreg(vgpu, i915_mmio_reg_offset(reg)) =
 275                 intel_uncore_read(uncore, reg);
 276
 277         reg = RING_ACTHD(engine->mmio_base);
 278         vgpu_vreg(vgpu, i915_mmio_reg_offset(reg)) =
 279                 intel_uncore_read(uncore, reg);
 280
 281         reg = RING_ACTHD_UDW(engine->mmio_base);
 282         vgpu_vreg(vgpu, i915_mmio_reg_offset(reg)) =
 283                 intel_uncore_read(uncore, reg);
 284 }
 285
 286 static int shadow_context_status_change(struct notifier_block *nb,
 287                 unsigned long action, void *data)
 288 {
 289         struct i915_request *rq = data;
 290         struct intel_gvt *gvt = container_of(nb, struct intel_gvt,
 291                                 shadow_ctx_notifier_block[rq->engine->id]);
 292         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
 293         enum intel_engine_id ring_id = rq->engine->id;
 294         struct intel_vgpu_workload *workload;
 295         unsigned long flags;
 296
 297         if (!is_gvt_request(rq)) {
 298                 spin_lock_irqsave(&scheduler->mmio_context_lock, flags);
 299                 if (action == INTEL_CONTEXT_SCHEDULE_IN &&
 300                     scheduler->engine_owner[ring_id]) {
 301                         /* Switch ring from vGPU to host. */
 302                         intel_gvt_switch_mmio(scheduler->engine_owner[ring_id],
 303                                               NULL, rq->engine);
 304                         scheduler->engine_owner[ring_id] = NULL;
 305                 }
 306                 spin_unlock_irqrestore(&scheduler->mmio_context_lock, flags);
 307
 308                 return NOTIFY_OK;
 309         }
 310
 311         workload = scheduler->current_workload[ring_id];
 312         if (unlikely(!workload))
 313                 return NOTIFY_OK;
 314
 315         switch (action) {
 316         case INTEL_CONTEXT_SCHEDULE_IN:
 317                 spin_lock_irqsave(&scheduler->mmio_context_lock, flags);
 318                 if (workload->vgpu != scheduler->engine_owner[ring_id]) {
 319                         /* Switch ring from host to vGPU or vGPU to vGPU. */
 320                         intel_gvt_switch_mmio(scheduler->engine_owner[ring_id],
 321                                               workload->vgpu, rq->engine);
 322                         scheduler->engine_owner[ring_id] = workload->vgpu;
 323                 } else
 324                         gvt_dbg_sched("skip ring %d mmio switch for vgpu%d\n",
 325                                       ring_id, workload->vgpu->id);
 326                 spin_unlock_irqrestore(&scheduler->mmio_context_lock, flags);
 327                 atomic_set(&workload->shadow_ctx_active, 1);
 328                 break;
 329         case INTEL_CONTEXT_SCHEDULE_OUT:
 330                 save_ring_hw_state(workload->vgpu, rq->engine);
 331                 atomic_set(&workload->shadow_ctx_active, 0);
 332                 break;
 333         case INTEL_CONTEXT_SCHEDULE_PREEMPTED:
 334                 save_ring_hw_state(workload->vgpu, rq->engine);
 335                 break;
 336         default:
 337                 WARN_ON(1);
 338                 return NOTIFY_OK;
 339         }
 340         wake_up(&workload->shadow_ctx_status_wq);
 341         return NOTIFY_OK;
 342 }
 343
 344 static void
 345 shadow_context_descriptor_update(struct intel_context *ce,
 346                                  struct intel_vgpu_workload *workload)
 347 {
 348         u64 desc = ce->lrc.desc;
 349
 350         /*
 351          * Update bits 0-11 of the context descriptor which includes flags
 352          * like GEN8_CTX_* cached in desc_template
 353          */
 354         desc &= ~(0x3ull << GEN8_CTX_ADDRESSING_MODE_SHIFT);
 355         desc |= (u64)workload->ctx_desc.addressing_mode <<
 356                 GEN8_CTX_ADDRESSING_MODE_SHIFT;
 357
 358         ce->lrc.desc = desc;
 359 }
 360
 361 static int copy_workload_to_ring_buffer(struct intel_vgpu_workload *workload)
 362 {
 363         struct intel_vgpu *vgpu = workload->vgpu;
 364         struct i915_request *req = workload->req;
 365         void *shadow_ring_buffer_va;
 366         u32 *cs;
 367         int err;
 368
 369         if (GRAPHICS_VER(req->engine->i915) == 9 && is_inhibit_context(req->context))
 370                 intel_vgpu_restore_inhibit_context(vgpu, req);
 371
 372         /*
 373          * To track whether a request has started on HW, we can emit a
 374          * breadcrumb at the beginning of the request and check its
 375          * timeline's HWSP to see if the breadcrumb has advanced past the
 376          * start of this request. Actually, the request must have the
 377          * init_breadcrumb if its timeline set has_init_bread_crumb, or the
 378          * scheduler might get a wrong state of it during reset. Since the
 379          * requests from gvt always set the has_init_breadcrumb flag, here
 380          * need to do the emit_init_breadcrumb for all the requests.
 381          */
 382         if (req->engine->emit_init_breadcrumb) {
 383                 err = req->engine->emit_init_breadcrumb(req);
 384                 if (err) {
 385                         gvt_vgpu_err("fail to emit init breadcrumb\n");
 386                         return err;
 387                 }
 388         }
 389
 390         /* allocate shadow ring buffer */
 391         cs = intel_ring_begin(workload->req, workload->rb_len / sizeof(u32));
 392         if (IS_ERR(cs)) {
 393                 gvt_vgpu_err("fail to alloc size =%ld shadow  ring buffer\n",
 394                         workload->rb_len);
 395                 return PTR_ERR(cs);
 396         }
 397
 398         shadow_ring_buffer_va = workload->shadow_ring_buffer_va;
 399
 400         /* get shadow ring buffer va */
 401         workload->shadow_ring_buffer_va = cs;
 402
 403         memcpy(cs, shadow_ring_buffer_va,
 404                         workload->rb_len);
 405
 406         cs += workload->rb_len / sizeof(u32);
 407         intel_ring_advance(workload->req, cs);
 408
 409         return 0;
 410 }
 411
 412 static void release_shadow_wa_ctx(struct intel_shadow_wa_ctx *wa_ctx)
 413 {
 414         if (!wa_ctx->indirect_ctx.obj)
 415                 return;
 416
 417         i915_gem_object_lock(wa_ctx->indirect_ctx.obj, NULL);
 418         i915_gem_object_unpin_map(wa_ctx->indirect_ctx.obj);
 419         i915_gem_object_unlock(wa_ctx->indirect_ctx.obj);
 420         i915_gem_object_put(wa_ctx->indirect_ctx.obj);
 421
 422         wa_ctx->indirect_ctx.obj = NULL;
 423         wa_ctx->indirect_ctx.shadow_va = NULL;
 424 }
 425
 426 static void set_dma_address(struct i915_page_directory *pd, dma_addr_t addr)
 427 {
 428         struct scatterlist *sg = pd->pt.base->mm.pages->sgl;
 429
 430         /* This is not a good idea */
 431         sg->dma_address = addr;
 432 }
 433
 434 static void set_context_ppgtt_from_shadow(struct intel_vgpu_workload *workload,
 435                                           struct intel_context *ce)
 436 {
 437         struct intel_vgpu_mm *mm = workload->shadow_mm;
 438         struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(ce->vm);
 439         int i = 0;
 440
 441         if (mm->ppgtt_mm.root_entry_type == GTT_TYPE_PPGTT_ROOT_L4_ENTRY) {
 442                 set_dma_address(ppgtt->pd, mm->ppgtt_mm.shadow_pdps[0]);
 443         } else {
 444                 for (i = 0; i < GVT_RING_CTX_NR_PDPS; i++) {
 445                         struct i915_page_directory * const pd =
 446                                 i915_pd_entry(ppgtt->pd, i);
 447                         /* skip now as current i915 ppgtt alloc won't allocate
 448                            top level pdp for non 4-level table, won't impact
 449                            shadow ppgtt. */
 450                         if (!pd)
 451                                 break;
 452
 453                         set_dma_address(pd, mm->ppgtt_mm.shadow_pdps[i]);
 454                 }
 455         }
 456 }
 457
 458 static int
 459 intel_gvt_workload_req_alloc(struct intel_vgpu_workload *workload)
 460 {
 461         struct intel_vgpu *vgpu = workload->vgpu;
 462         struct intel_vgpu_submission *s = &vgpu->submission;
 463         struct i915_request *rq;
 464
 465         if (workload->req)
 466                 return 0;
 467
 468         rq = i915_request_create(s->shadow[workload->engine->id]);
 469         if (IS_ERR(rq)) {
 470                 gvt_vgpu_err("fail to allocate gem request\n");
 471                 return PTR_ERR(rq);
 472         }
 473
 474         workload->req = i915_request_get(rq);
 475         return 0;
 476 }
 477
 478 /**
 479  * intel_gvt_scan_and_shadow_workload - audit the workload by scanning and
 480  * shadow it as well, include ringbuffer,wa_ctx and ctx.
 481  * @workload: an abstract entity for each execlist submission.
 482  *
 483  * This function is called before the workload submitting to i915, to make
 484  * sure the content of the workload is valid.
 485  */
 486 int intel_gvt_scan_and_shadow_workload(struct intel_vgpu_workload *workload)
 487 {
 488         struct intel_vgpu *vgpu = workload->vgpu;
 489         struct intel_vgpu_submission *s = &vgpu->submission;
 490         int ret;
 491
 492         lockdep_assert_held(&vgpu->vgpu_lock);
 493
 494         if (workload->shadow)
 495                 return 0;
 496
 497         if (!test_and_set_bit(workload->engine->id, s->shadow_ctx_desc_updated))
 498                 shadow_context_descriptor_update(s->shadow[workload->engine->id],
 499                                                  workload);
 500
 501         ret = intel_gvt_scan_and_shadow_ringbuffer(workload);
 502         if (ret)
 503                 return ret;
 504
 505         if (workload->engine->id == RCS0 &&
 506             workload->wa_ctx.indirect_ctx.size) {
 507                 ret = intel_gvt_scan_and_shadow_wa_ctx(&workload->wa_ctx);
 508                 if (ret)
 509                         goto err_shadow;
 510         }
 511
 512         workload->shadow = true;
 513         return 0;
 514
 515 err_shadow:
 516         release_shadow_wa_ctx(&workload->wa_ctx);
 517         return ret;
 518 }
 519
 520 static void release_shadow_batch_buffer(struct intel_vgpu_workload *workload);
 521
 522 static int prepare_shadow_batch_buffer(struct intel_vgpu_workload *workload)
 523 {
 524         struct intel_gvt *gvt = workload->vgpu->gvt;
 525         const int gmadr_bytes = gvt->device_info.gmadr_bytes_in_cmd;
 526         struct intel_vgpu_shadow_bb *bb;
 527         struct i915_gem_ww_ctx ww;
 528         int ret;
 529
 530         list_for_each_entry(bb, &workload->shadow_bb, list) {
 531                 /* For privilge batch buffer and not wa_ctx, the bb_start_cmd_va
 532                  * is only updated into ring_scan_buffer, not real ring address
 533                  * allocated in later copy_workload_to_ring_buffer. pls be noted
 534                  * shadow_ring_buffer_va is now pointed to real ring buffer va
 535                  * in copy_workload_to_ring_buffer.
 536                  */
 537
 538                 if (bb->bb_offset)
 539                         bb->bb_start_cmd_va = workload->shadow_ring_buffer_va
 540                                 + bb->bb_offset;
 541
 542                 /*
 543                  * For non-priv bb, scan&shadow is only for
 544                  * debugging purpose, so the content of shadow bb
 545                  * is the same as original bb. Therefore,
 546                  * here, rather than switch to shadow bb's gma
 547                  * address, we directly use original batch buffer's
 548                  * gma address, and send original bb to hardware
 549                  * directly
 550                  */
 551                 if (!bb->ppgtt) {
 552                         i915_gem_ww_ctx_init(&ww, false);
 553 retry:
 554                         i915_gem_object_lock(bb->obj, &ww);
 555
 556                         bb->vma = i915_gem_object_ggtt_pin_ww(bb->obj, &ww,
 557                                                               NULL, 0, 0, 0);
 558                         if (IS_ERR(bb->vma)) {
 559                                 ret = PTR_ERR(bb->vma);
 560                                 if (ret == -EDEADLK) {
 561                                         ret = i915_gem_ww_ctx_backoff(&ww);
 562                                         if (!ret)
 563                                                 goto retry;
 564                                 }
 565                                 goto err;
 566                         }
 567
 568                         /* relocate shadow batch buffer */
 569                         bb->bb_start_cmd_va[1] = i915_ggtt_offset(bb->vma);
 570                         if (gmadr_bytes == 8)
 571                                 bb->bb_start_cmd_va[2] = 0;
 572
 573                         ret = i915_vma_move_to_active(bb->vma, workload->req,
 574                                                       __EXEC_OBJECT_NO_REQUEST_AWAIT);
 575                         if (ret)
 576                                 goto err;
 577
 578                         /* No one is going to touch shadow bb from now on. */
 579                         i915_gem_object_flush_map(bb->obj);
 580                         i915_gem_ww_ctx_fini(&ww);
 581                 }
 582         }
 583         return 0;
 584 err:
 585         i915_gem_ww_ctx_fini(&ww);
 586         release_shadow_batch_buffer(workload);
 587         return ret;
 588 }
 589
 590 static void update_wa_ctx_2_shadow_ctx(struct intel_shadow_wa_ctx *wa_ctx)
 591 {
 592         struct intel_vgpu_workload *workload =
 593                 container_of(wa_ctx, struct intel_vgpu_workload, wa_ctx);
 594         struct i915_request *rq = workload->req;
 595         struct execlist_ring_context *shadow_ring_context =
 596                 (struct execlist_ring_context *)rq->context->lrc_reg_state;
 597
 598         shadow_ring_context->bb_per_ctx_ptr.val =
 599                 (shadow_ring_context->bb_per_ctx_ptr.val &
 600                 (~PER_CTX_ADDR_MASK)) | wa_ctx->per_ctx.shadow_gma;
 601         shadow_ring_context->rcs_indirect_ctx.val =
 602                 (shadow_ring_context->rcs_indirect_ctx.val &
 603                 (~INDIRECT_CTX_ADDR_MASK)) | wa_ctx->indirect_ctx.shadow_gma;
 604 }
 605
 606 static int prepare_shadow_wa_ctx(struct intel_shadow_wa_ctx *wa_ctx)
 607 {
 608         struct i915_vma *vma;
 609         unsigned char *per_ctx_va =
 610                 (unsigned char *)wa_ctx->indirect_ctx.shadow_va +
 611                 wa_ctx->indirect_ctx.size;
 612         struct i915_gem_ww_ctx ww;
 613         int ret;
 614
 615         if (wa_ctx->indirect_ctx.size == 0)
 616                 return 0;
 617
 618         i915_gem_ww_ctx_init(&ww, false);
 619 retry:
 620         i915_gem_object_lock(wa_ctx->indirect_ctx.obj, &ww);
 621
 622         vma = i915_gem_object_ggtt_pin_ww(wa_ctx->indirect_ctx.obj, &ww, NULL,
 623                                           0, CACHELINE_BYTES, 0);
 624         if (IS_ERR(vma)) {
 625                 ret = PTR_ERR(vma);
 626                 if (ret == -EDEADLK) {
 627                         ret = i915_gem_ww_ctx_backoff(&ww);
 628                         if (!ret)
 629                                 goto retry;
 630                 }
 631                 return ret;
 632         }
 633
 634         i915_gem_ww_ctx_fini(&ww);
 635
 636         /* FIXME: we are not tracking our pinned VMA leaving it
 637          * up to the core to fix up the stray pin_count upon
 638          * free.
 639          */
 640
 641         wa_ctx->indirect_ctx.shadow_gma = i915_ggtt_offset(vma);
 642
 643         wa_ctx->per_ctx.shadow_gma = *((unsigned int *)per_ctx_va + 1);
 644         memset(per_ctx_va, 0, CACHELINE_BYTES);
 645
 646         update_wa_ctx_2_shadow_ctx(wa_ctx);
 647         return 0;
 648 }
 649
 650 static void update_vreg_in_ctx(struct intel_vgpu_workload *workload)
 651 {
 652         vgpu_vreg_t(workload->vgpu, RING_START(workload->engine->mmio_base)) =
 653                 workload->rb_start;
 654 }
 655
 656 static void release_shadow_batch_buffer(struct intel_vgpu_workload *workload)
 657 {
 658         struct intel_vgpu_shadow_bb *bb, *pos;
 659
 660         if (list_empty(&workload->shadow_bb))
 661                 return;
 662
 663         bb = list_first_entry(&workload->shadow_bb,
 664                         struct intel_vgpu_shadow_bb, list);
 665
 666         list_for_each_entry_safe(bb, pos, &workload->shadow_bb, list) {
 667                 if (bb->obj) {
 668                         i915_gem_object_lock(bb->obj, NULL);
 669                         if (bb->va && !IS_ERR(bb->va))
 670                                 i915_gem_object_unpin_map(bb->obj);
 671
 672                         if (bb->vma && !IS_ERR(bb->vma))
 673                                 i915_vma_unpin(bb->vma);
 674
 675                         i915_gem_object_unlock(bb->obj);
 676                         i915_gem_object_put(bb->obj);
 677                 }
 678                 list_del(&bb->list);
 679                 kfree(bb);
 680         }
 681 }
 682
 683 static int
 684 intel_vgpu_shadow_mm_pin(struct intel_vgpu_workload *workload)
 685 {
 686         struct intel_vgpu *vgpu = workload->vgpu;
 687         struct intel_vgpu_mm *m;
 688         int ret = 0;
 689
 690         ret = intel_vgpu_pin_mm(workload->shadow_mm);
 691         if (ret) {
 692                 gvt_vgpu_err("fail to vgpu pin mm\n");
 693                 return ret;
 694         }
 695
 696         if (workload->shadow_mm->type != INTEL_GVT_MM_PPGTT ||
 697             !workload->shadow_mm->ppgtt_mm.shadowed) {
 698                 intel_vgpu_unpin_mm(workload->shadow_mm);
 699                 gvt_vgpu_err("workload shadow ppgtt isn't ready\n");
 700                 return -EINVAL;
 701         }
 702
 703         if (!list_empty(&workload->lri_shadow_mm)) {
 704                 list_for_each_entry(m, &workload->lri_shadow_mm,
 705                                     ppgtt_mm.link) {
 706                         ret = intel_vgpu_pin_mm(m);
 707                         if (ret) {
 708                                 list_for_each_entry_from_reverse(m,
 709                                                                  &workload->lri_shadow_mm,
 710                                                                  ppgtt_mm.link)
 711                                         intel_vgpu_unpin_mm(m);
 712                                 gvt_vgpu_err("LRI shadow ppgtt fail to pin\n");
 713                                 break;
 714                         }
 715                 }
 716         }
 717
 718         if (ret)
 719                 intel_vgpu_unpin_mm(workload->shadow_mm);
 720
 721         return ret;
 722 }
 723
 724 static void
 725 intel_vgpu_shadow_mm_unpin(struct intel_vgpu_workload *workload)
 726 {
 727         struct intel_vgpu_mm *m;
 728
 729         if (!list_empty(&workload->lri_shadow_mm)) {
 730                 list_for_each_entry(m, &workload->lri_shadow_mm,
 731                                     ppgtt_mm.link)
 732                         intel_vgpu_unpin_mm(m);
 733         }
 734         intel_vgpu_unpin_mm(workload->shadow_mm);
 735 }
 736
 737 static int prepare_workload(struct intel_vgpu_workload *workload)
 738 {
 739         struct intel_vgpu *vgpu = workload->vgpu;
 740         struct intel_vgpu_submission *s = &vgpu->submission;
 741         int ret = 0;
 742
 743         ret = intel_vgpu_shadow_mm_pin(workload);
 744         if (ret) {
 745                 gvt_vgpu_err("fail to pin shadow mm\n");
 746                 return ret;
 747         }
 748
 749         update_shadow_pdps(workload);
 750
 751         set_context_ppgtt_from_shadow(workload, s->shadow[workload->engine->id]);
 752
 753         ret = intel_vgpu_sync_oos_pages(workload->vgpu);
 754         if (ret) {
 755                 gvt_vgpu_err("fail to vgpu sync oos pages\n");
 756                 goto err_unpin_mm;
 757         }
 758
 759         ret = intel_vgpu_flush_post_shadow(workload->vgpu);
 760         if (ret) {
 761                 gvt_vgpu_err("fail to flush post shadow\n");
 762                 goto err_unpin_mm;
 763         }
 764
 765         ret = copy_workload_to_ring_buffer(workload);
 766         if (ret) {
 767                 gvt_vgpu_err("fail to generate request\n");
 768                 goto err_unpin_mm;
 769         }
 770
 771         ret = prepare_shadow_batch_buffer(workload);
 772         if (ret) {
 773                 gvt_vgpu_err("fail to prepare_shadow_batch_buffer\n");
 774                 goto err_unpin_mm;
 775         }
 776
 777         ret = prepare_shadow_wa_ctx(&workload->wa_ctx);
 778         if (ret) {
 779                 gvt_vgpu_err("fail to prepare_shadow_wa_ctx\n");
 780                 goto err_shadow_batch;
 781         }
 782
 783         if (workload->prepare) {
 784                 ret = workload->prepare(workload);
 785                 if (ret)
 786                         goto err_shadow_wa_ctx;
 787         }
 788
 789         return 0;
 790 err_shadow_wa_ctx:
 791         release_shadow_wa_ctx(&workload->wa_ctx);
 792 err_shadow_batch:
 793         release_shadow_batch_buffer(workload);
 794 err_unpin_mm:
 795         intel_vgpu_shadow_mm_unpin(workload);
 796         return ret;
 797 }
 798
 799 static int dispatch_workload(struct intel_vgpu_workload *workload)
 800 {
 801         struct intel_vgpu *vgpu = workload->vgpu;
 802         struct i915_request *rq;
 803         int ret;
 804
 805         gvt_dbg_sched("ring id %s prepare to dispatch workload %p\n",
 806                       workload->engine->name, workload);
 807
 808         mutex_lock(&vgpu->vgpu_lock);
 809
 810         ret = intel_gvt_workload_req_alloc(workload);
 811         if (ret)
 812                 goto err_req;
 813
 814         ret = intel_gvt_scan_and_shadow_workload(workload);
 815         if (ret)
 816                 goto out;
 817
 818         ret = populate_shadow_context(workload);
 819         if (ret) {
 820                 release_shadow_wa_ctx(&workload->wa_ctx);
 821                 goto out;
 822         }
 823
 824         ret = prepare_workload(workload);
 825 out:
 826         if (ret) {
 827                 /* We might still need to add request with
 828                  * clean ctx to retire it properly..
 829                  */
 830                 rq = fetch_and_zero(&workload->req);
 831                 i915_request_put(rq);
 832         }
 833
 834         if (!IS_ERR_OR_NULL(workload->req)) {
 835                 gvt_dbg_sched("ring id %s submit workload to i915 %p\n",
 836                               workload->engine->name, workload->req);
 837                 i915_request_add(workload->req);
 838                 workload->dispatched = true;
 839         }
 840 err_req:
 841         if (ret)
 842                 workload->status = ret;
 843         mutex_unlock(&vgpu->vgpu_lock);
 844         return ret;
 845 }
 846
 847 static struct intel_vgpu_workload *
 848 pick_next_workload(struct intel_gvt *gvt, struct intel_engine_cs *engine)
 849 {
 850         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
 851         struct intel_vgpu_workload *workload = NULL;
 852
 853         mutex_lock(&gvt->sched_lock);
 854
 855         /*
 856          * no current vgpu / will be scheduled out / no workload
 857          * bail out
 858          */
 859         if (!scheduler->current_vgpu) {
 860                 gvt_dbg_sched("ring %s stop - no current vgpu\n", engine->name);
 861                 goto out;
 862         }
 863
 864         if (scheduler->need_reschedule) {
 865                 gvt_dbg_sched("ring %s stop - will reschedule\n", engine->name);
 866                 goto out;
 867         }
 868
 869         if (!test_bit(INTEL_VGPU_STATUS_ACTIVE,
 870                       scheduler->current_vgpu->status) ||
 871             list_empty(workload_q_head(scheduler->current_vgpu, engine)))
 872                 goto out;
 873
 874         /*
 875          * still have current workload, maybe the workload disptacher
 876          * fail to submit it for some reason, resubmit it.
 877          */
 878         if (scheduler->current_workload[engine->id]) {
 879                 workload = scheduler->current_workload[engine->id];
 880                 gvt_dbg_sched("ring %s still have current workload %p\n",
 881                               engine->name, workload);
 882                 goto out;
 883         }
 884
 885         /*
 886          * pick a workload as current workload
 887          * once current workload is set, schedule policy routines
 888          * will wait the current workload is finished when trying to
 889          * schedule out a vgpu.
 890          */
 891         scheduler->current_workload[engine->id] =
 892                 list_first_entry(workload_q_head(scheduler->current_vgpu,
 893                                                  engine),
 894                                  struct intel_vgpu_workload, list);
 895
 896         workload = scheduler->current_workload[engine->id];
 897
 898         gvt_dbg_sched("ring %s pick new workload %p\n", engine->name, workload);
 899
 900         atomic_inc(&workload->vgpu->submission.running_workload_num);
 901 out:
 902         mutex_unlock(&gvt->sched_lock);
 903         return workload;
 904 }
 905
 906 static void update_guest_pdps(struct intel_vgpu *vgpu,
 907                               u64 ring_context_gpa, u32 pdp[8])
 908 {
 909         u64 gpa;
 910         int i;
 911
 912         gpa = ring_context_gpa + RING_CTX_OFF(pdps[0].val);
 913
 914         for (i = 0; i < 8; i++)
 915                 intel_gvt_write_gpa(vgpu, gpa + i * 8, &pdp[7 - i], 4);
 916 }
 917
 918 static __maybe_unused bool
 919 check_shadow_context_ppgtt(struct execlist_ring_context *c, struct intel_vgpu_mm *m)
 920 {
 921         if (m->ppgtt_mm.root_entry_type == GTT_TYPE_PPGTT_ROOT_L4_ENTRY) {
 922                 u64 shadow_pdp = c->pdps[7].val | (u64) c->pdps[6].val << 32;
 923
 924                 if (shadow_pdp != m->ppgtt_mm.shadow_pdps[0]) {
 925                         gvt_dbg_mm("4-level context ppgtt not match LRI command\n");
 926                         return false;
 927                 }
 928                 return true;
 929         } else {
 930                 /* see comment in LRI handler in cmd_parser.c */
 931                 gvt_dbg_mm("invalid shadow mm type\n");
 932                 return false;
 933         }
 934 }
 935
 936 static void update_guest_context(struct intel_vgpu_workload *workload)
 937 {
 938         struct i915_request *rq = workload->req;
 939         struct intel_vgpu *vgpu = workload->vgpu;
 940         struct execlist_ring_context *shadow_ring_context;
 941         struct intel_context *ctx = workload->req->context;
 942         void *context_base;
 943         void *src;
 944         unsigned long context_gpa, context_page_num;
 945         unsigned long gpa_base; /* first gpa of consecutive GPAs */
 946         unsigned long gpa_size; /* size of consecutive GPAs*/
 947         int i;
 948         u32 ring_base;
 949         u32 head, tail;
 950         u16 wrap_count;
 951
 952         gvt_dbg_sched("ring id %d workload lrca %x\n", rq->engine->id,
 953                       workload->ctx_desc.lrca);
 954
 955         GEM_BUG_ON(!intel_context_is_pinned(ctx));
 956
 957         head = workload->rb_head;
 958         tail = workload->rb_tail;
 959         wrap_count = workload->guest_rb_head >> RB_HEAD_WRAP_CNT_OFF;
 960
 961         if (tail < head) {
 962                 if (wrap_count == RB_HEAD_WRAP_CNT_MAX)
 963                         wrap_count = 0;
 964                 else
 965                         wrap_count += 1;
 966         }
 967
 968         head = (wrap_count << RB_HEAD_WRAP_CNT_OFF) | tail;
 969
 970         ring_base = rq->engine->mmio_base;
 971         vgpu_vreg_t(vgpu, RING_TAIL(ring_base)) = tail;
 972         vgpu_vreg_t(vgpu, RING_HEAD(ring_base)) = head;
 973
 974         context_page_num = rq->engine->context_size;
 975         context_page_num = context_page_num >> PAGE_SHIFT;
 976
 977         if (IS_BROADWELL(rq->i915) && rq->engine->id == RCS0)
 978                 context_page_num = 19;
 979
 980         context_base = (void *) ctx->lrc_reg_state -
 981                         (LRC_STATE_PN << I915_GTT_PAGE_SHIFT);
 982
 983         /* find consecutive GPAs from gma until the first inconsecutive GPA.
 984          * write to the consecutive GPAs from src virtual address
 985          */
 986         gpa_size = 0;
 987         for (i = 2; i < context_page_num; i++) {
 988                 context_gpa = intel_vgpu_gma_to_gpa(vgpu->gtt.ggtt_mm,
 989                                 (u32)((workload->ctx_desc.lrca + i) <<
 990                                         I915_GTT_PAGE_SHIFT));
 991                 if (context_gpa == INTEL_GVT_INVALID_ADDR) {
 992                         gvt_vgpu_err("invalid guest context descriptor\n");
 993                         return;
 994                 }
 995
 996                 if (gpa_size == 0) {
 997                         gpa_base = context_gpa;
 998                         src = context_base + (i << I915_GTT_PAGE_SHIFT);
 999                 } else if (context_gpa != gpa_base + gpa_size)
1000                         goto write;
1001
1002                 gpa_size += I915_GTT_PAGE_SIZE;
1003
1004                 if (i == context_page_num - 1)
1005                         goto write;
1006
1007                 continue;
1008
1009 write:
1010                 intel_gvt_write_gpa(vgpu, gpa_base, src, gpa_size);
1011                 gpa_base = context_gpa;
1012                 gpa_size = I915_GTT_PAGE_SIZE;
1013                 src = context_base + (i << I915_GTT_PAGE_SHIFT);
1014         }
1015
1016         intel_gvt_write_gpa(vgpu, workload->ring_context_gpa +
1017                 RING_CTX_OFF(ring_header.val), &workload->rb_tail, 4);
1018
1019         shadow_ring_context = (void *) ctx->lrc_reg_state;
1020
1021         if (!list_empty(&workload->lri_shadow_mm)) {
1022                 struct intel_vgpu_mm *m = list_last_entry(&workload->lri_shadow_mm,
1023                                                           struct intel_vgpu_mm,
1024                                                           ppgtt_mm.link);
1025                 GEM_BUG_ON(!check_shadow_context_ppgtt(shadow_ring_context, m));
1026                 update_guest_pdps(vgpu, workload->ring_context_gpa,
1027                                   (void *)m->ppgtt_mm.guest_pdps);
1028         }
1029
1030 #define COPY_REG(name) \
1031         intel_gvt_write_gpa(vgpu, workload->ring_context_gpa + \
1032                 RING_CTX_OFF(name.val), &shadow_ring_context->name.val, 4)
1033
1034         COPY_REG(ctx_ctrl);
1035         COPY_REG(ctx_timestamp);
1036
1037 #undef COPY_REG
1038
1039         intel_gvt_write_gpa(vgpu,
1040                         workload->ring_context_gpa +
1041                         sizeof(*shadow_ring_context),
1042                         (void *)shadow_ring_context +
1043                         sizeof(*shadow_ring_context),
1044                         I915_GTT_PAGE_SIZE - sizeof(*shadow_ring_context));
1045 }
1046
1047 void intel_vgpu_clean_workloads(struct intel_vgpu *vgpu,
1048                                 intel_engine_mask_t engine_mask)
1049 {
1050         struct intel_vgpu_submission *s = &vgpu->submission;
1051         struct intel_engine_cs *engine;
1052         struct intel_vgpu_workload *pos, *n;
1053         intel_engine_mask_t tmp;
1054
1055         /* free the unsubmited workloads in the queues. */
1056         for_each_engine_masked(engine, vgpu->gvt->gt, engine_mask, tmp) {
1057                 list_for_each_entry_safe(pos, n,
1058                         &s->workload_q_head[engine->id], list) {
1059                         list_del_init(&pos->list);
1060                         intel_vgpu_destroy_workload(pos);
1061                 }
1062                 clear_bit(engine->id, s->shadow_ctx_desc_updated);
1063         }
1064 }
1065
1066 static void complete_current_workload(struct intel_gvt *gvt, int ring_id)
1067 {
1068         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
1069         struct intel_vgpu_workload *workload =
1070                 scheduler->current_workload[ring_id];
1071         struct intel_vgpu *vgpu = workload->vgpu;
1072         struct intel_vgpu_submission *s = &vgpu->submission;
1073         struct i915_request *rq = workload->req;
1074         int event;
1075
1076         mutex_lock(&vgpu->vgpu_lock);
1077         mutex_lock(&gvt->sched_lock);
1078
1079         /* For the workload w/ request, needs to wait for the context
1080          * switch to make sure request is completed.
1081          * For the workload w/o request, directly complete the workload.
1082          */
1083         if (rq) {
1084                 wait_event(workload->shadow_ctx_status_wq,
1085                            !atomic_read(&workload->shadow_ctx_active));
1086
1087                 /* If this request caused GPU hang, req->fence.error will
1088                  * be set to -EIO. Use -EIO to set workload status so
1089                  * that when this request caused GPU hang, didn't trigger
1090                  * context switch interrupt to guest.
1091                  */
1092                 if (likely(workload->status == -EINPROGRESS)) {
1093                         if (workload->req->fence.error == -EIO)
1094                                 workload->status = -EIO;
1095                         else
1096                                 workload->status = 0;
1097                 }
1098
1099                 if (!workload->status &&
1100                     !(vgpu->resetting_eng & BIT(ring_id))) {
1101                         update_guest_context(workload);
1102
1103                         for_each_set_bit(event, workload->pending_events,
1104                                          INTEL_GVT_EVENT_MAX)
1105                                 intel_vgpu_trigger_virtual_event(vgpu, event);
1106                 }
1107
1108                 i915_request_put(fetch_and_zero(&workload->req));
1109         }
1110
1111         gvt_dbg_sched("ring id %d complete workload %p status %d\n",
1112                         ring_id, workload, workload->status);
1113
1114         scheduler->current_workload[ring_id] = NULL;
1115
1116         list_del_init(&workload->list);
1117
1118         if (workload->status || vgpu->resetting_eng & BIT(ring_id)) {
1119                 /* if workload->status is not successful means HW GPU
1120                  * has occurred GPU hang or something wrong with i915/GVT,
1121                  * and GVT won't inject context switch interrupt to guest.
1122                  * So this error is a vGPU hang actually to the guest.
1123                  * According to this we should emunlate a vGPU hang. If
1124                  * there are pending workloads which are already submitted
1125                  * from guest, we should clean them up like HW GPU does.
1126                  *
1127                  * if it is in middle of engine resetting, the pending
1128                  * workloads won't be submitted to HW GPU and will be
1129                  * cleaned up during the resetting process later, so doing
1130                  * the workload clean up here doesn't have any impact.
1131                  **/
1132                 intel_vgpu_clean_workloads(vgpu, BIT(ring_id));
1133         }
1134
1135         workload->complete(workload);
1136
1137         intel_vgpu_shadow_mm_unpin(workload);
1138         intel_vgpu_destroy_workload(workload);
1139
1140         atomic_dec(&s->running_workload_num);
1141         wake_up(&scheduler->workload_complete_wq);
1142
1143         if (gvt->scheduler.need_reschedule)
1144                 intel_gvt_request_service(gvt, INTEL_GVT_REQUEST_EVENT_SCHED);
1145
1146         mutex_unlock(&gvt->sched_lock);
1147         mutex_unlock(&vgpu->vgpu_lock);
1148 }
1149
1150 static int workload_thread(void *arg)
1151 {
1152         struct intel_engine_cs *engine = arg;
1153         const bool need_force_wake = GRAPHICS_VER(engine->i915) >= 9;
1154         struct intel_gvt *gvt = engine->i915->gvt;
1155         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
1156         struct intel_vgpu_workload *workload = NULL;
1157         struct intel_vgpu *vgpu = NULL;
1158         int ret;
1159         DEFINE_WAIT_FUNC(wait, woken_wake_function);
1160
1161         gvt_dbg_core("workload thread for ring %s started\n", engine->name);
1162
1163         while (!kthread_should_stop()) {
1164                 intel_wakeref_t wakeref;
1165
1166                 add_wait_queue(&scheduler->waitq[engine->id], &wait);
1167                 do {
1168                         workload = pick_next_workload(gvt, engine);
1169                         if (workload)
1170                                 break;
1171                         wait_woken(&wait, TASK_INTERRUPTIBLE,
1172                                    MAX_SCHEDULE_TIMEOUT);
1173                 } while (!kthread_should_stop());
1174                 remove_wait_queue(&scheduler->waitq[engine->id], &wait);
1175
1176                 if (!workload)
1177                         break;
1178
1179                 gvt_dbg_sched("ring %s next workload %p vgpu %d\n",
1180                               engine->name, workload,
1181                               workload->vgpu->id);
1182
1183                 wakeref = intel_runtime_pm_get(engine->uncore->rpm);
1184
1185                 gvt_dbg_sched("ring %s will dispatch workload %p\n",
1186                               engine->name, workload);
1187
1188                 if (need_force_wake)
1189                         intel_uncore_forcewake_get(engine->uncore,
1190                                                    FORCEWAKE_ALL);
1191                 /*
1192                  * Update the vReg of the vGPU which submitted this
1193                  * workload. The vGPU may use these registers for checking
1194                  * the context state. The value comes from GPU commands
1195                  * in this workload.
1196                  */
1197                 update_vreg_in_ctx(workload);
1198
1199                 ret = dispatch_workload(workload);
1200
1201                 if (ret) {
1202                         vgpu = workload->vgpu;
1203                         gvt_vgpu_err("fail to dispatch workload, skip\n");
1204                         goto complete;
1205                 }
1206
1207                 gvt_dbg_sched("ring %s wait workload %p\n",
1208                               engine->name, workload);
1209                 i915_request_wait(workload->req, 0, MAX_SCHEDULE_TIMEOUT);
1210
1211 complete:
1212                 gvt_dbg_sched("will complete workload %p, status: %d\n",
1213                               workload, workload->status);
1214
1215                 complete_current_workload(gvt, engine->id);
1216
1217                 if (need_force_wake)
1218                         intel_uncore_forcewake_put(engine->uncore,
1219                                                    FORCEWAKE_ALL);
1220
1221                 intel_runtime_pm_put(engine->uncore->rpm, wakeref);
1222                 if (ret && (vgpu_is_vm_unhealthy(ret)))
1223                         enter_failsafe_mode(vgpu, GVT_FAILSAFE_GUEST_ERR);
1224         }
1225         return 0;
1226 }
1227
1228 void intel_gvt_wait_vgpu_idle(struct intel_vgpu *vgpu)
1229 {
1230         struct intel_vgpu_submission *s = &vgpu->submission;
1231         struct intel_gvt *gvt = vgpu->gvt;
1232         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
1233
1234         if (atomic_read(&s->running_workload_num)) {
1235                 gvt_dbg_sched("wait vgpu idle\n");
1236
1237                 wait_event(scheduler->workload_complete_wq,
1238                                 !atomic_read(&s->running_workload_num));
1239         }
1240 }
1241
1242 void intel_gvt_clean_workload_scheduler(struct intel_gvt *gvt)
1243 {
1244         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
1245         struct intel_engine_cs *engine;
1246         enum intel_engine_id i;
1247
1248         gvt_dbg_core("clean workload scheduler\n");
1249
1250         for_each_engine(engine, gvt->gt, i) {
1251                 atomic_notifier_chain_unregister(
1252                                         &engine->context_status_notifier,
1253                                         &gvt->shadow_ctx_notifier_block[i]);
1254                 kthread_stop(scheduler->thread[i]);
1255         }
1256 }
1257
1258 int intel_gvt_init_workload_scheduler(struct intel_gvt *gvt)
1259 {
1260         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
1261         struct intel_engine_cs *engine;
1262         enum intel_engine_id i;
1263         int ret;
1264
1265         gvt_dbg_core("init workload scheduler\n");
1266
1267         init_waitqueue_head(&scheduler->workload_complete_wq);
1268
1269         for_each_engine(engine, gvt->gt, i) {
1270                 init_waitqueue_head(&scheduler->waitq[i]);
1271
1272                 scheduler->thread[i] = kthread_run(workload_thread, engine,
1273                                                    "gvt:%s", engine->name);
1274                 if (IS_ERR(scheduler->thread[i])) {
1275                         gvt_err("fail to create workload thread\n");
1276                         ret = PTR_ERR(scheduler->thread[i]);
1277                         goto err;
1278                 }
1279
1280                 gvt->shadow_ctx_notifier_block[i].notifier_call =
1281                                         shadow_context_status_change;
1282                 atomic_notifier_chain_register(&engine->context_status_notifier,
1283                                         &gvt->shadow_ctx_notifier_block[i]);
1284         }
1285
1286         return 0;
1287
1288 err:
1289         intel_gvt_clean_workload_scheduler(gvt);
1290         return ret;
1291 }
1292
1293 static void
1294 i915_context_ppgtt_root_restore(struct intel_vgpu_submission *s,
1295                                 struct i915_ppgtt *ppgtt)
1296 {
1297         int i;
1298
1299         if (i915_vm_is_4lvl(&ppgtt->vm)) {
1300                 set_dma_address(ppgtt->pd, s->i915_context_pml4);
1301         } else {
1302                 for (i = 0; i < GEN8_3LVL_PDPES; i++) {
1303                         struct i915_page_directory * const pd =
1304                                 i915_pd_entry(ppgtt->pd, i);
1305
1306                         set_dma_address(pd, s->i915_context_pdps[i]);
1307                 }
1308         }
1309 }
1310
1311 /**
1312  * intel_vgpu_clean_submission - free submission-related resource for vGPU
1313  * @vgpu: a vGPU
1314  *
1315  * This function is called when a vGPU is being destroyed.
1316  *
1317  */
1318 void intel_vgpu_clean_submission(struct intel_vgpu *vgpu)
1319 {
1320         struct intel_vgpu_submission *s = &vgpu->submission;
1321         struct intel_engine_cs *engine;
1322         enum intel_engine_id id;
1323
1324         intel_vgpu_select_submission_ops(vgpu, ALL_ENGINES, 0);
1325
1326         i915_context_ppgtt_root_restore(s, i915_vm_to_ppgtt(s->shadow[0]->vm));
1327         for_each_engine(engine, vgpu->gvt->gt, id)
1328                 intel_context_put(s->shadow[id]);
1329
1330         kmem_cache_destroy(s->workloads);
1331 }
1332
1333
1334 /**
1335  * intel_vgpu_reset_submission - reset submission-related resource for vGPU
1336  * @vgpu: a vGPU
1337  * @engine_mask: engines expected to be reset
1338  *
1339  * This function is called when a vGPU is being destroyed.
1340  *
1341  */
1342 void intel_vgpu_reset_submission(struct intel_vgpu *vgpu,
1343                                  intel_engine_mask_t engine_mask)
1344 {
1345         struct intel_vgpu_submission *s = &vgpu->submission;
1346
1347         if (!s->active)
1348                 return;
1349
1350         intel_vgpu_clean_workloads(vgpu, engine_mask);
1351         s->ops->reset(vgpu, engine_mask);
1352 }
1353
1354 static void
1355 i915_context_ppgtt_root_save(struct intel_vgpu_submission *s,
1356                              struct i915_ppgtt *ppgtt)
1357 {
1358         int i;
1359
1360         if (i915_vm_is_4lvl(&ppgtt->vm)) {
1361                 s->i915_context_pml4 = px_dma(ppgtt->pd);
1362         } else {
1363                 for (i = 0; i < GEN8_3LVL_PDPES; i++) {
1364                         struct i915_page_directory * const pd =
1365                                 i915_pd_entry(ppgtt->pd, i);
1366
1367                         s->i915_context_pdps[i] = px_dma(pd);
1368                 }
1369         }
1370 }
1371
1372 /**
1373  * intel_vgpu_setup_submission - setup submission-related resource for vGPU
1374  * @vgpu: a vGPU
1375  *
1376  * This function is called when a vGPU is being created.
1377  *
1378  * Returns:
1379  * Zero on success, negative error code if failed.
1380  *
1381  */
1382 int intel_vgpu_setup_submission(struct intel_vgpu *vgpu)
1383 {
1384         struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
1385         struct intel_vgpu_submission *s = &vgpu->submission;
1386         struct intel_engine_cs *engine;
1387         struct i915_ppgtt *ppgtt;
1388         enum intel_engine_id i;
1389         int ret;
1390
1391         ppgtt = i915_ppgtt_create(to_gt(i915), I915_BO_ALLOC_PM_EARLY);
1392         if (IS_ERR(ppgtt))
1393                 return PTR_ERR(ppgtt);
1394
1395         i915_context_ppgtt_root_save(s, ppgtt);
1396
1397         for_each_engine(engine, vgpu->gvt->gt, i) {
1398                 struct intel_context *ce;
1399
1400                 INIT_LIST_HEAD(&s->workload_q_head[i]);
1401                 s->shadow[i] = ERR_PTR(-EINVAL);
1402
1403                 ce = intel_context_create(engine);
1404                 if (IS_ERR(ce)) {
1405                         ret = PTR_ERR(ce);
1406                         goto out_shadow_ctx;
1407                 }
1408
1409                 i915_vm_put(ce->vm);
1410                 ce->vm = i915_vm_get(&ppgtt->vm);
1411                 intel_context_set_single_submission(ce);
1412
1413                 /* Max ring buffer size */
1414                 if (!intel_uc_wants_guc_submission(&engine->gt->uc))
1415                         ce->ring_size = SZ_2M;
1416
1417                 s->shadow[i] = ce;
1418         }
1419
1420         bitmap_zero(s->shadow_ctx_desc_updated, I915_NUM_ENGINES);
1421
1422         s->workloads = kmem_cache_create_usercopy("gvt-g_vgpu_workload",
1423                                                   sizeof(struct intel_vgpu_workload), 0,
1424                                                   SLAB_HWCACHE_ALIGN,
1425                                                   offsetof(struct intel_vgpu_workload, rb_tail),
1426                                                   sizeof_field(struct intel_vgpu_workload, rb_tail),
1427                                                   NULL);
1428
1429         if (!s->workloads) {
1430                 ret = -ENOMEM;
1431                 goto out_shadow_ctx;
1432         }
1433
1434         atomic_set(&s->running_workload_num, 0);
1435         bitmap_zero(s->tlb_handle_pending, I915_NUM_ENGINES);
1436
1437         memset(s->last_ctx, 0, sizeof(s->last_ctx));
1438
1439         i915_vm_put(&ppgtt->vm);
1440         return 0;
1441
1442 out_shadow_ctx:
1443         i915_context_ppgtt_root_restore(s, ppgtt);
1444         for_each_engine(engine, vgpu->gvt->gt, i) {
1445                 if (IS_ERR(s->shadow[i]))
1446                         break;
1447
1448                 intel_context_put(s->shadow[i]);
1449         }
1450         i915_vm_put(&ppgtt->vm);
1451         return ret;
1452 }
1453
1454 /**
1455  * intel_vgpu_select_submission_ops - select virtual submission interface
1456  * @vgpu: a vGPU
1457  * @engine_mask: either ALL_ENGINES or target engine mask
1458  * @interface: expected vGPU virtual submission interface
1459  *
1460  * This function is called when guest configures submission interface.
1461  *
1462  * Returns:
1463  * Zero on success, negative error code if failed.
1464  *
1465  */
1466 int intel_vgpu_select_submission_ops(struct intel_vgpu *vgpu,
1467                                      intel_engine_mask_t engine_mask,
1468                                      unsigned int interface)
1469 {
1470         struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
1471         struct intel_vgpu_submission *s = &vgpu->submission;
1472         const struct intel_vgpu_submission_ops *ops[] = {
1473                 [INTEL_VGPU_EXECLIST_SUBMISSION] =
1474                         &intel_vgpu_execlist_submission_ops,
1475         };
1476         int ret;
1477
1478         if (drm_WARN_ON(&i915->drm, interface >= ARRAY_SIZE(ops)))
1479                 return -EINVAL;
1480
1481         if (drm_WARN_ON(&i915->drm,
1482                         interface == 0 && engine_mask != ALL_ENGINES))
1483                 return -EINVAL;
1484
1485         if (s->active)
1486                 s->ops->clean(vgpu, engine_mask);
1487
1488         if (interface == 0) {
1489                 s->ops = NULL;
1490                 s->virtual_submission_interface = 0;
1491                 s->active = false;
1492                 gvt_dbg_core("vgpu%d: remove submission ops\n", vgpu->id);
1493                 return 0;
1494         }
1495
1496         ret = ops[interface]->init(vgpu, engine_mask);
1497         if (ret)
1498                 return ret;
1499
1500         s->ops = ops[interface];
1501         s->virtual_submission_interface = interface;
1502         s->active = true;
1503
1504         gvt_dbg_core("vgpu%d: activate ops [ %s ]\n",
1505                         vgpu->id, s->ops->name);
1506
1507         return 0;
1508 }
1509
1510 /**
1511  * intel_vgpu_destroy_workload - destroy a vGPU workload
1512  * @workload: workload to destroy
1513  *
1514  * This function is called when destroy a vGPU workload.
1515  *
1516  */
1517 void intel_vgpu_destroy_workload(struct intel_vgpu_workload *workload)
1518 {
1519         struct intel_vgpu_submission *s = &workload->vgpu->submission;
1520
1521         intel_context_unpin(s->shadow[workload->engine->id]);
1522         release_shadow_batch_buffer(workload);
1523         release_shadow_wa_ctx(&workload->wa_ctx);
1524
1525         if (!list_empty(&workload->lri_shadow_mm)) {
1526                 struct intel_vgpu_mm *m, *mm;
1527                 list_for_each_entry_safe(m, mm, &workload->lri_shadow_mm,
1528                                          ppgtt_mm.link) {
1529                         list_del(&m->ppgtt_mm.link);
1530                         intel_vgpu_mm_put(m);
1531                 }
1532         }
1533
1534         GEM_BUG_ON(!list_empty(&workload->lri_shadow_mm));
1535         if (workload->shadow_mm)
1536                 intel_vgpu_mm_put(workload->shadow_mm);
1537
1538         kmem_cache_free(s->workloads, workload);
1539 }
1540
1541 static struct intel_vgpu_workload *
1542 alloc_workload(struct intel_vgpu *vgpu)
1543 {
1544         struct intel_vgpu_submission *s = &vgpu->submission;
1545         struct intel_vgpu_workload *workload;
1546
1547         workload = kmem_cache_zalloc(s->workloads, GFP_KERNEL);
1548         if (!workload)
1549                 return ERR_PTR(-ENOMEM);
1550
1551         INIT_LIST_HEAD(&workload->list);
1552         INIT_LIST_HEAD(&workload->shadow_bb);
1553         INIT_LIST_HEAD(&workload->lri_shadow_mm);
1554
1555         init_waitqueue_head(&workload->shadow_ctx_status_wq);
1556         atomic_set(&workload->shadow_ctx_active, 0);
1557
1558         workload->status = -EINPROGRESS;
1559         workload->vgpu = vgpu;
1560
1561         return workload;
1562 }
1563
1564 #define RING_CTX_OFF(x) \
1565         offsetof(struct execlist_ring_context, x)
1566
1567 static void read_guest_pdps(struct intel_vgpu *vgpu,
1568                 u64 ring_context_gpa, u32 pdp[8])
1569 {
1570         u64 gpa;
1571         int i;
1572
1573         gpa = ring_context_gpa + RING_CTX_OFF(pdps[0].val);
1574
1575         for (i = 0; i < 8; i++)
1576                 intel_gvt_read_gpa(vgpu,
1577                                 gpa + i * 8, &pdp[7 - i], 4);
1578 }
1579
1580 static int prepare_mm(struct intel_vgpu_workload *workload)
1581 {
1582         struct execlist_ctx_descriptor_format *desc = &workload->ctx_desc;
1583         struct intel_vgpu_mm *mm;
1584         struct intel_vgpu *vgpu = workload->vgpu;
1585         enum intel_gvt_gtt_type root_entry_type;
1586         u64 pdps[GVT_RING_CTX_NR_PDPS];
1587
1588         switch (desc->addressing_mode) {
1589         case 1: /* legacy 32-bit */
1590                 root_entry_type = GTT_TYPE_PPGTT_ROOT_L3_ENTRY;
1591                 break;
1592         case 3: /* legacy 64-bit */
1593                 root_entry_type = GTT_TYPE_PPGTT_ROOT_L4_ENTRY;
1594                 break;
1595         default:
1596                 gvt_vgpu_err("Advanced Context mode(SVM) is not supported!\n");
1597                 return -EINVAL;
1598         }
1599
1600         read_guest_pdps(workload->vgpu, workload->ring_context_gpa, (void *)pdps);
1601
1602         mm = intel_vgpu_get_ppgtt_mm(workload->vgpu, root_entry_type, pdps);
1603         if (IS_ERR(mm))
1604                 return PTR_ERR(mm);
1605
1606         workload->shadow_mm = mm;
1607         return 0;
1608 }
1609
1610 #define same_context(a, b) (((a)->context_id == (b)->context_id) && \
1611                 ((a)->lrca == (b)->lrca))
1612
1613 /**
1614  * intel_vgpu_create_workload - create a vGPU workload
1615  * @vgpu: a vGPU
1616  * @engine: the engine
1617  * @desc: a guest context descriptor
1618  *
1619  * This function is called when creating a vGPU workload.
1620  *
1621  * Returns:
1622  * struct intel_vgpu_workload * on success, negative error code in
1623  * pointer if failed.
1624  *
1625  */
1626 struct intel_vgpu_workload *
1627 intel_vgpu_create_workload(struct intel_vgpu *vgpu,
1628                            const struct intel_engine_cs *engine,
1629                            struct execlist_ctx_descriptor_format *desc)
1630 {
1631         struct intel_vgpu_submission *s = &vgpu->submission;
1632         struct list_head *q = workload_q_head(vgpu, engine);
1633         struct intel_vgpu_workload *last_workload = NULL;
1634         struct intel_vgpu_workload *workload = NULL;
1635         u64 ring_context_gpa;
1636         u32 head, tail, start, ctl, ctx_ctl, per_ctx, indirect_ctx;
1637         u32 guest_head;
1638         int ret;
1639
1640         ring_context_gpa = intel_vgpu_gma_to_gpa(vgpu->gtt.ggtt_mm,
1641                         (u32)((desc->lrca + 1) << I915_GTT_PAGE_SHIFT));
1642         if (ring_context_gpa == INTEL_GVT_INVALID_ADDR) {
1643                 gvt_vgpu_err("invalid guest context LRCA: %x\n", desc->lrca);
1644                 return ERR_PTR(-EINVAL);
1645         }
1646
1647         intel_gvt_read_gpa(vgpu, ring_context_gpa +
1648                         RING_CTX_OFF(ring_header.val), &head, 4);
1649
1650         intel_gvt_read_gpa(vgpu, ring_context_gpa +
1651                         RING_CTX_OFF(ring_tail.val), &tail, 4);
1652
1653         guest_head = head;
1654
1655         head &= RB_HEAD_OFF_MASK;
1656         tail &= RB_TAIL_OFF_MASK;
1657
1658         list_for_each_entry_reverse(last_workload, q, list) {
1659
1660                 if (same_context(&last_workload->ctx_desc, desc)) {
1661                         gvt_dbg_el("ring %s cur workload == last\n",
1662                                    engine->name);
1663                         gvt_dbg_el("ctx head %x real head %lx\n", head,
1664                                    last_workload->rb_tail);
1665                         /*
1666                          * cannot use guest context head pointer here,
1667                          * as it might not be updated at this time
1668                          */
1669                         head = last_workload->rb_tail;
1670                         break;
1671                 }
1672         }
1673
1674         gvt_dbg_el("ring %s begin a new workload\n", engine->name);
1675
1676         /* record some ring buffer register values for scan and shadow */
1677         intel_gvt_read_gpa(vgpu, ring_context_gpa +
1678                         RING_CTX_OFF(rb_start.val), &start, 4);
1679         intel_gvt_read_gpa(vgpu, ring_context_gpa +
1680                         RING_CTX_OFF(rb_ctrl.val), &ctl, 4);
1681         intel_gvt_read_gpa(vgpu, ring_context_gpa +
1682                         RING_CTX_OFF(ctx_ctrl.val), &ctx_ctl, 4);
1683
1684         if (!intel_gvt_ggtt_validate_range(vgpu, start,
1685                                 _RING_CTL_BUF_SIZE(ctl))) {
1686                 gvt_vgpu_err("context contain invalid rb at: 0x%x\n", start);
1687                 return ERR_PTR(-EINVAL);
1688         }
1689
1690         workload = alloc_workload(vgpu);
1691         if (IS_ERR(workload))
1692                 return workload;
1693
1694         workload->engine = engine;
1695         workload->ctx_desc = *desc;
1696         workload->ring_context_gpa = ring_context_gpa;
1697         workload->rb_head = head;
1698         workload->guest_rb_head = guest_head;
1699         workload->rb_tail = tail;
1700         workload->rb_start = start;
1701         workload->rb_ctl = ctl;
1702
1703         if (engine->id == RCS0) {
1704                 intel_gvt_read_gpa(vgpu, ring_context_gpa +
1705                         RING_CTX_OFF(bb_per_ctx_ptr.val), &per_ctx, 4);
1706                 intel_gvt_read_gpa(vgpu, ring_context_gpa +
1707                         RING_CTX_OFF(rcs_indirect_ctx.val), &indirect_ctx, 4);
1708
1709                 workload->wa_ctx.indirect_ctx.guest_gma =
1710                         indirect_ctx & INDIRECT_CTX_ADDR_MASK;
1711                 workload->wa_ctx.indirect_ctx.size =
1712                         (indirect_ctx & INDIRECT_CTX_SIZE_MASK) *
1713                         CACHELINE_BYTES;
1714
1715                 if (workload->wa_ctx.indirect_ctx.size != 0) {
1716                         if (!intel_gvt_ggtt_validate_range(vgpu,
1717                                 workload->wa_ctx.indirect_ctx.guest_gma,
1718                                 workload->wa_ctx.indirect_ctx.size)) {
1719                                 gvt_vgpu_err("invalid wa_ctx at: 0x%lx\n",
1720                                     workload->wa_ctx.indirect_ctx.guest_gma);
1721                                 kmem_cache_free(s->workloads, workload);
1722                                 return ERR_PTR(-EINVAL);
1723                         }
1724                 }
1725
1726                 workload->wa_ctx.per_ctx.guest_gma =
1727                         per_ctx & PER_CTX_ADDR_MASK;
1728                 workload->wa_ctx.per_ctx.valid = per_ctx & 1;
1729                 if (workload->wa_ctx.per_ctx.valid) {
1730                         if (!intel_gvt_ggtt_validate_range(vgpu,
1731                                 workload->wa_ctx.per_ctx.guest_gma,
1732                                 CACHELINE_BYTES)) {
1733                                 gvt_vgpu_err("invalid per_ctx at: 0x%lx\n",
1734                                         workload->wa_ctx.per_ctx.guest_gma);
1735                                 kmem_cache_free(s->workloads, workload);
1736                                 return ERR_PTR(-EINVAL);
1737                         }
1738                 }
1739         }
1740
1741         gvt_dbg_el("workload %p ring %s head %x tail %x start %x ctl %x\n",
1742                    workload, engine->name, head, tail, start, ctl);
1743
1744         ret = prepare_mm(workload);
1745         if (ret) {
1746                 kmem_cache_free(s->workloads, workload);
1747                 return ERR_PTR(ret);
1748         }
1749
1750         /* Only scan and shadow the first workload in the queue
1751          * as there is only one pre-allocated buf-obj for shadow.
1752          */
1753         if (list_empty(q)) {
1754                 intel_wakeref_t wakeref;
1755
1756                 with_intel_runtime_pm(engine->gt->uncore->rpm, wakeref)
1757                         ret = intel_gvt_scan_and_shadow_workload(workload);
1758         }
1759
1760         if (ret) {
1761                 if (vgpu_is_vm_unhealthy(ret))
1762                         enter_failsafe_mode(vgpu, GVT_FAILSAFE_GUEST_ERR);
1763                 intel_vgpu_destroy_workload(workload);
1764                 return ERR_PTR(ret);
1765         }
1766
1767         ret = intel_context_pin(s->shadow[engine->id]);
1768         if (ret) {
1769                 intel_vgpu_destroy_workload(workload);
1770                 return ERR_PTR(ret);
1771         }
1772
1773         return workload;
1774 }
1775
1776 /**
1777  * intel_vgpu_queue_workload - Qeue a vGPU workload
1778  * @workload: the workload to queue in
1779  */
1780 void intel_vgpu_queue_workload(struct intel_vgpu_workload *workload)
1781 {
1782         list_add_tail(&workload->list,
1783                       workload_q_head(workload->vgpu, workload->engine));
1784         intel_gvt_kick_schedule(workload->vgpu->gvt);
1785         wake_up(&workload->vgpu->gvt->scheduler.waitq[workload->engine->id]);
1786 }