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 "i915_drv.h"
  39 #include "gvt.h"
  40
  41 #define RING_CTX_OFF(x) \
  42         offsetof(struct execlist_ring_context, x)
  43
  44 static void set_context_pdp_root_pointer(
  45                 struct execlist_ring_context *ring_context,
  46                 u32 pdp[8])
  47 {
  48         int i;
  49
  50         for (i = 0; i < 8; i++)
  51                 ring_context->pdps[i].val = pdp[7 - i];
  52 }
  53
  54 static void update_shadow_pdps(struct intel_vgpu_workload *workload)
  55 {
  56         struct drm_i915_gem_object *ctx_obj =
  57                 workload->req->hw_context->state->obj;
  58         struct execlist_ring_context *shadow_ring_context;
  59         struct page *page;
  60
  61         if (WARN_ON(!workload->shadow_mm))
  62                 return;
  63
  64         if (WARN_ON(!atomic_read(&workload->shadow_mm->pincount)))
  65                 return;
  66
  67         page = i915_gem_object_get_page(ctx_obj, LRC_STATE_PN);
  68         shadow_ring_context = kmap(page);
  69         set_context_pdp_root_pointer(shadow_ring_context,
  70                         (void *)workload->shadow_mm->ppgtt_mm.shadow_pdps);
  71         kunmap(page);
  72 }
  73
  74 /*
  75  * when populating shadow ctx from guest, we should not overrride oa related
  76  * registers, so that they will not be overlapped by guest oa configs. Thus
  77  * made it possible to capture oa data from host for both host and guests.
  78  */
  79 static void sr_oa_regs(struct intel_vgpu_workload *workload,
  80                 u32 *reg_state, bool save)
  81 {
  82         struct drm_i915_private *dev_priv = workload->vgpu->gvt->dev_priv;
  83         u32 ctx_oactxctrl = dev_priv->perf.oa.ctx_oactxctrl_offset;
  84         u32 ctx_flexeu0 = dev_priv->perf.oa.ctx_flexeu0_offset;
  85         int i = 0;
  86         u32 flex_mmio[] = {
  87                 i915_mmio_reg_offset(EU_PERF_CNTL0),
  88                 i915_mmio_reg_offset(EU_PERF_CNTL1),
  89                 i915_mmio_reg_offset(EU_PERF_CNTL2),
  90                 i915_mmio_reg_offset(EU_PERF_CNTL3),
  91                 i915_mmio_reg_offset(EU_PERF_CNTL4),
  92                 i915_mmio_reg_offset(EU_PERF_CNTL5),
  93                 i915_mmio_reg_offset(EU_PERF_CNTL6),
  94         };
  95
  96         if (workload->ring_id != RCS)
  97                 return;
  98
  99         if (save) {
 100                 workload->oactxctrl = reg_state[ctx_oactxctrl + 1];
 101
 102                 for (i = 0; i < ARRAY_SIZE(workload->flex_mmio); i++) {
 103                         u32 state_offset = ctx_flexeu0 + i * 2;
 104
 105                         workload->flex_mmio[i] = reg_state[state_offset + 1];
 106                 }
 107         } else {
 108                 reg_state[ctx_oactxctrl] =
 109                         i915_mmio_reg_offset(GEN8_OACTXCONTROL);
 110                 reg_state[ctx_oactxctrl + 1] = workload->oactxctrl;
 111
 112                 for (i = 0; i < ARRAY_SIZE(workload->flex_mmio); i++) {
 113                         u32 state_offset = ctx_flexeu0 + i * 2;
 114                         u32 mmio = flex_mmio[i];
 115
 116                         reg_state[state_offset] = mmio;
 117                         reg_state[state_offset + 1] = workload->flex_mmio[i];
 118                 }
 119         }
 120 }
 121
 122 static int populate_shadow_context(struct intel_vgpu_workload *workload)
 123 {
 124         struct intel_vgpu *vgpu = workload->vgpu;
 125         struct intel_gvt *gvt = vgpu->gvt;
 126         int ring_id = workload->ring_id;
 127         struct drm_i915_gem_object *ctx_obj =
 128                 workload->req->hw_context->state->obj;
 129         struct execlist_ring_context *shadow_ring_context;
 130         struct page *page;
 131         void *dst;
 132         unsigned long context_gpa, context_page_num;
 133         int i;
 134
 135         page = i915_gem_object_get_page(ctx_obj, LRC_STATE_PN);
 136         shadow_ring_context = kmap(page);
 137
 138         sr_oa_regs(workload, (u32 *)shadow_ring_context, true);
 139 #define COPY_REG(name) \
 140         intel_gvt_hypervisor_read_gpa(vgpu, workload->ring_context_gpa \
 141                 + RING_CTX_OFF(name.val), &shadow_ring_context->name.val, 4)
 142 #define COPY_REG_MASKED(name) {\
 143                 intel_gvt_hypervisor_read_gpa(vgpu, workload->ring_context_gpa \
 144                                               + RING_CTX_OFF(name.val),\
 145                                               &shadow_ring_context->name.val, 4);\
 146                 shadow_ring_context->name.val |= 0xffff << 16;\
 147         }
 148
 149         COPY_REG_MASKED(ctx_ctrl);
 150         COPY_REG(ctx_timestamp);
 151
 152         if (ring_id == RCS) {
 153                 COPY_REG(bb_per_ctx_ptr);
 154                 COPY_REG(rcs_indirect_ctx);
 155                 COPY_REG(rcs_indirect_ctx_offset);
 156         }
 157 #undef COPY_REG
 158 #undef COPY_REG_MASKED
 159
 160         intel_gvt_hypervisor_read_gpa(vgpu,
 161                         workload->ring_context_gpa +
 162                         sizeof(*shadow_ring_context),
 163                         (void *)shadow_ring_context +
 164                         sizeof(*shadow_ring_context),
 165                         I915_GTT_PAGE_SIZE - sizeof(*shadow_ring_context));
 166
 167         sr_oa_regs(workload, (u32 *)shadow_ring_context, false);
 168         kunmap(page);
 169
 170         if (IS_RESTORE_INHIBIT(shadow_ring_context->ctx_ctrl.val))
 171                 return 0;
 172
 173         gvt_dbg_sched("ring id %d workload lrca %x", ring_id,
 174                         workload->ctx_desc.lrca);
 175
 176         context_page_num = gvt->dev_priv->engine[ring_id]->context_size;
 177
 178         context_page_num = context_page_num >> PAGE_SHIFT;
 179
 180         if (IS_BROADWELL(gvt->dev_priv) && ring_id == RCS)
 181                 context_page_num = 19;
 182
 183         i = 2;
 184         while (i < context_page_num) {
 185                 context_gpa = intel_vgpu_gma_to_gpa(vgpu->gtt.ggtt_mm,
 186                                 (u32)((workload->ctx_desc.lrca + i) <<
 187                                 I915_GTT_PAGE_SHIFT));
 188                 if (context_gpa == INTEL_GVT_INVALID_ADDR) {
 189                         gvt_vgpu_err("Invalid guest context descriptor\n");
 190                         return -EFAULT;
 191                 }
 192
 193                 page = i915_gem_object_get_page(ctx_obj, LRC_HEADER_PAGES + i);
 194                 dst = kmap(page);
 195                 intel_gvt_hypervisor_read_gpa(vgpu, context_gpa, dst,
 196                                 I915_GTT_PAGE_SIZE);
 197                 kunmap(page);
 198                 i++;
 199         }
 200         return 0;
 201 }
 202
 203 static inline bool is_gvt_request(struct i915_request *req)
 204 {
 205         return i915_gem_context_force_single_submission(req->gem_context);
 206 }
 207
 208 static void save_ring_hw_state(struct intel_vgpu *vgpu, int ring_id)
 209 {
 210         struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 211         u32 ring_base = dev_priv->engine[ring_id]->mmio_base;
 212         i915_reg_t reg;
 213
 214         reg = RING_INSTDONE(ring_base);
 215         vgpu_vreg(vgpu, i915_mmio_reg_offset(reg)) = I915_READ_FW(reg);
 216         reg = RING_ACTHD(ring_base);
 217         vgpu_vreg(vgpu, i915_mmio_reg_offset(reg)) = I915_READ_FW(reg);
 218         reg = RING_ACTHD_UDW(ring_base);
 219         vgpu_vreg(vgpu, i915_mmio_reg_offset(reg)) = I915_READ_FW(reg);
 220 }
 221
 222 static int shadow_context_status_change(struct notifier_block *nb,
 223                 unsigned long action, void *data)
 224 {
 225         struct i915_request *req = data;
 226         struct intel_gvt *gvt = container_of(nb, struct intel_gvt,
 227                                 shadow_ctx_notifier_block[req->engine->id]);
 228         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
 229         enum intel_engine_id ring_id = req->engine->id;
 230         struct intel_vgpu_workload *workload;
 231         unsigned long flags;
 232
 233         if (!is_gvt_request(req)) {
 234                 spin_lock_irqsave(&scheduler->mmio_context_lock, flags);
 235                 if (action == INTEL_CONTEXT_SCHEDULE_IN &&
 236                     scheduler->engine_owner[ring_id]) {
 237                         /* Switch ring from vGPU to host. */
 238                         intel_gvt_switch_mmio(scheduler->engine_owner[ring_id],
 239                                               NULL, ring_id);
 240                         scheduler->engine_owner[ring_id] = NULL;
 241                 }
 242                 spin_unlock_irqrestore(&scheduler->mmio_context_lock, flags);
 243
 244                 return NOTIFY_OK;
 245         }
 246
 247         workload = scheduler->current_workload[ring_id];
 248         if (unlikely(!workload))
 249                 return NOTIFY_OK;
 250
 251         switch (action) {
 252         case INTEL_CONTEXT_SCHEDULE_IN:
 253                 spin_lock_irqsave(&scheduler->mmio_context_lock, flags);
 254                 if (workload->vgpu != scheduler->engine_owner[ring_id]) {
 255                         /* Switch ring from host to vGPU or vGPU to vGPU. */
 256                         intel_gvt_switch_mmio(scheduler->engine_owner[ring_id],
 257                                               workload->vgpu, ring_id);
 258                         scheduler->engine_owner[ring_id] = workload->vgpu;
 259                 } else
 260                         gvt_dbg_sched("skip ring %d mmio switch for vgpu%d\n",
 261                                       ring_id, workload->vgpu->id);
 262                 spin_unlock_irqrestore(&scheduler->mmio_context_lock, flags);
 263                 atomic_set(&workload->shadow_ctx_active, 1);
 264                 break;
 265         case INTEL_CONTEXT_SCHEDULE_OUT:
 266                 save_ring_hw_state(workload->vgpu, ring_id);
 267                 atomic_set(&workload->shadow_ctx_active, 0);
 268                 break;
 269         case INTEL_CONTEXT_SCHEDULE_PREEMPTED:
 270                 save_ring_hw_state(workload->vgpu, ring_id);
 271                 break;
 272         default:
 273                 WARN_ON(1);
 274                 return NOTIFY_OK;
 275         }
 276         wake_up(&workload->shadow_ctx_status_wq);
 277         return NOTIFY_OK;
 278 }
 279
 280 static void shadow_context_descriptor_update(struct intel_context *ce)
 281 {
 282         u64 desc = 0;
 283
 284         desc = ce->lrc_desc;
 285
 286         /* Update bits 0-11 of the context descriptor which includes flags
 287          * like GEN8_CTX_* cached in desc_template
 288          */
 289         desc &= U64_MAX << 12;
 290         desc |= ce->gem_context->desc_template & ((1ULL << 12) - 1);
 291
 292         ce->lrc_desc = desc;
 293 }
 294
 295 static int copy_workload_to_ring_buffer(struct intel_vgpu_workload *workload)
 296 {
 297         struct intel_vgpu *vgpu = workload->vgpu;
 298         struct i915_request *req = workload->req;
 299         void *shadow_ring_buffer_va;
 300         u32 *cs;
 301
 302         if ((IS_KABYLAKE(req->i915) || IS_BROXTON(req->i915))
 303                 && is_inhibit_context(req->hw_context))
 304                 intel_vgpu_restore_inhibit_context(vgpu, req);
 305
 306         /* allocate shadow ring buffer */
 307         cs = intel_ring_begin(workload->req, workload->rb_len / sizeof(u32));
 308         if (IS_ERR(cs)) {
 309                 gvt_vgpu_err("fail to alloc size =%ld shadow  ring buffer\n",
 310                         workload->rb_len);
 311                 return PTR_ERR(cs);
 312         }
 313
 314         shadow_ring_buffer_va = workload->shadow_ring_buffer_va;
 315
 316         /* get shadow ring buffer va */
 317         workload->shadow_ring_buffer_va = cs;
 318
 319         memcpy(cs, shadow_ring_buffer_va,
 320                         workload->rb_len);
 321
 322         cs += workload->rb_len / sizeof(u32);
 323         intel_ring_advance(workload->req, cs);
 324
 325         return 0;
 326 }
 327
 328 static void release_shadow_wa_ctx(struct intel_shadow_wa_ctx *wa_ctx)
 329 {
 330         if (!wa_ctx->indirect_ctx.obj)
 331                 return;
 332
 333         i915_gem_object_unpin_map(wa_ctx->indirect_ctx.obj);
 334         i915_gem_object_put(wa_ctx->indirect_ctx.obj);
 335 }
 336
 337 /**
 338  * intel_gvt_scan_and_shadow_workload - audit the workload by scanning and
 339  * shadow it as well, include ringbuffer,wa_ctx and ctx.
 340  * @workload: an abstract entity for each execlist submission.
 341  *
 342  * This function is called before the workload submitting to i915, to make
 343  * sure the content of the workload is valid.
 344  */
 345 int intel_gvt_scan_and_shadow_workload(struct intel_vgpu_workload *workload)
 346 {
 347         struct intel_vgpu *vgpu = workload->vgpu;
 348         struct intel_vgpu_submission *s = &vgpu->submission;
 349         struct i915_gem_context *shadow_ctx = s->shadow_ctx;
 350         struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 351         struct intel_engine_cs *engine = dev_priv->engine[workload->ring_id];
 352         struct intel_context *ce;
 353         struct i915_request *rq;
 354         int ret;
 355
 356         lockdep_assert_held(&dev_priv->drm.struct_mutex);
 357
 358         if (workload->req)
 359                 return 0;
 360
 361         /* pin shadow context by gvt even the shadow context will be pinned
 362          * when i915 alloc request. That is because gvt will update the guest
 363          * context from shadow context when workload is completed, and at that
 364          * moment, i915 may already unpined the shadow context to make the
 365          * shadow_ctx pages invalid. So gvt need to pin itself. After update
 366          * the guest context, gvt can unpin the shadow_ctx safely.
 367          */
 368         ce = intel_context_pin(shadow_ctx, engine);
 369         if (IS_ERR(ce)) {
 370                 gvt_vgpu_err("fail to pin shadow context\n");
 371                 return PTR_ERR(ce);
 372         }
 373
 374         shadow_ctx->desc_template &= ~(0x3 << GEN8_CTX_ADDRESSING_MODE_SHIFT);
 375         shadow_ctx->desc_template |= workload->ctx_desc.addressing_mode <<
 376                                     GEN8_CTX_ADDRESSING_MODE_SHIFT;
 377
 378         if (!test_and_set_bit(workload->ring_id, s->shadow_ctx_desc_updated))
 379                 shadow_context_descriptor_update(ce);
 380
 381         ret = intel_gvt_scan_and_shadow_ringbuffer(workload);
 382         if (ret)
 383                 goto err_unpin;
 384
 385         if ((workload->ring_id == RCS) &&
 386             (workload->wa_ctx.indirect_ctx.size != 0)) {
 387                 ret = intel_gvt_scan_and_shadow_wa_ctx(&workload->wa_ctx);
 388                 if (ret)
 389                         goto err_shadow;
 390         }
 391
 392         rq = i915_request_alloc(engine, shadow_ctx);
 393         if (IS_ERR(rq)) {
 394                 gvt_vgpu_err("fail to allocate gem request\n");
 395                 ret = PTR_ERR(rq);
 396                 goto err_shadow;
 397         }
 398         workload->req = i915_request_get(rq);
 399
 400         ret = populate_shadow_context(workload);
 401         if (ret)
 402                 goto err_req;
 403
 404         return 0;
 405 err_req:
 406         rq = fetch_and_zero(&workload->req);
 407         i915_request_put(rq);
 408 err_shadow:
 409         release_shadow_wa_ctx(&workload->wa_ctx);
 410 err_unpin:
 411         intel_context_unpin(ce);
 412         return ret;
 413 }
 414
 415 static void release_shadow_batch_buffer(struct intel_vgpu_workload *workload);
 416
 417 static int prepare_shadow_batch_buffer(struct intel_vgpu_workload *workload)
 418 {
 419         struct intel_gvt *gvt = workload->vgpu->gvt;
 420         const int gmadr_bytes = gvt->device_info.gmadr_bytes_in_cmd;
 421         struct intel_vgpu_shadow_bb *bb;
 422         int ret;
 423
 424         list_for_each_entry(bb, &workload->shadow_bb, list) {
 425                 /* For privilge batch buffer and not wa_ctx, the bb_start_cmd_va
 426                  * is only updated into ring_scan_buffer, not real ring address
 427                  * allocated in later copy_workload_to_ring_buffer. pls be noted
 428                  * shadow_ring_buffer_va is now pointed to real ring buffer va
 429                  * in copy_workload_to_ring_buffer.
 430                  */
 431
 432                 if (bb->bb_offset)
 433                         bb->bb_start_cmd_va = workload->shadow_ring_buffer_va
 434                                 + bb->bb_offset;
 435
 436                 if (bb->ppgtt) {
 437                         /* for non-priv bb, scan&shadow is only for
 438                          * debugging purpose, so the content of shadow bb
 439                          * is the same as original bb. Therefore,
 440                          * here, rather than switch to shadow bb's gma
 441                          * address, we directly use original batch buffer's
 442                          * gma address, and send original bb to hardware
 443                          * directly
 444                          */
 445                         if (bb->clflush & CLFLUSH_AFTER) {
 446                                 drm_clflush_virt_range(bb->va,
 447                                                 bb->obj->base.size);
 448                                 bb->clflush &= ~CLFLUSH_AFTER;
 449                         }
 450                         i915_gem_obj_finish_shmem_access(bb->obj);
 451                         bb->accessing = false;
 452
 453                 } else {
 454                         bb->vma = i915_gem_object_ggtt_pin(bb->obj,
 455                                         NULL, 0, 0, 0);
 456                         if (IS_ERR(bb->vma)) {
 457                                 ret = PTR_ERR(bb->vma);
 458                                 goto err;
 459                         }
 460
 461                         /* relocate shadow batch buffer */
 462                         bb->bb_start_cmd_va[1] = i915_ggtt_offset(bb->vma);
 463                         if (gmadr_bytes == 8)
 464                                 bb->bb_start_cmd_va[2] = 0;
 465
 466                         /* No one is going to touch shadow bb from now on. */
 467                         if (bb->clflush & CLFLUSH_AFTER) {
 468                                 drm_clflush_virt_range(bb->va,
 469                                                 bb->obj->base.size);
 470                                 bb->clflush &= ~CLFLUSH_AFTER;
 471                         }
 472
 473                         ret = i915_gem_object_set_to_gtt_domain(bb->obj,
 474                                         false);
 475                         if (ret)
 476                                 goto err;
 477
 478                         i915_gem_obj_finish_shmem_access(bb->obj);
 479                         bb->accessing = false;
 480
 481                         ret = i915_vma_move_to_active(bb->vma,
 482                                                       workload->req,
 483                                                       0);
 484                         if (ret)
 485                                 goto err;
 486                 }
 487         }
 488         return 0;
 489 err:
 490         release_shadow_batch_buffer(workload);
 491         return ret;
 492 }
 493
 494 static void update_wa_ctx_2_shadow_ctx(struct intel_shadow_wa_ctx *wa_ctx)
 495 {
 496         struct intel_vgpu_workload *workload =
 497                 container_of(wa_ctx, struct intel_vgpu_workload, wa_ctx);
 498         struct i915_request *rq = workload->req;
 499         struct execlist_ring_context *shadow_ring_context =
 500                 (struct execlist_ring_context *)rq->hw_context->lrc_reg_state;
 501
 502         shadow_ring_context->bb_per_ctx_ptr.val =
 503                 (shadow_ring_context->bb_per_ctx_ptr.val &
 504                 (~PER_CTX_ADDR_MASK)) | wa_ctx->per_ctx.shadow_gma;
 505         shadow_ring_context->rcs_indirect_ctx.val =
 506                 (shadow_ring_context->rcs_indirect_ctx.val &
 507                 (~INDIRECT_CTX_ADDR_MASK)) | wa_ctx->indirect_ctx.shadow_gma;
 508 }
 509
 510 static int prepare_shadow_wa_ctx(struct intel_shadow_wa_ctx *wa_ctx)
 511 {
 512         struct i915_vma *vma;
 513         unsigned char *per_ctx_va =
 514                 (unsigned char *)wa_ctx->indirect_ctx.shadow_va +
 515                 wa_ctx->indirect_ctx.size;
 516
 517         if (wa_ctx->indirect_ctx.size == 0)
 518                 return 0;
 519
 520         vma = i915_gem_object_ggtt_pin(wa_ctx->indirect_ctx.obj, NULL,
 521                                        0, CACHELINE_BYTES, 0);
 522         if (IS_ERR(vma))
 523                 return PTR_ERR(vma);
 524
 525         /* FIXME: we are not tracking our pinned VMA leaving it
 526          * up to the core to fix up the stray pin_count upon
 527          * free.
 528          */
 529
 530         wa_ctx->indirect_ctx.shadow_gma = i915_ggtt_offset(vma);
 531
 532         wa_ctx->per_ctx.shadow_gma = *((unsigned int *)per_ctx_va + 1);
 533         memset(per_ctx_va, 0, CACHELINE_BYTES);
 534
 535         update_wa_ctx_2_shadow_ctx(wa_ctx);
 536         return 0;
 537 }
 538
 539 static void release_shadow_batch_buffer(struct intel_vgpu_workload *workload)
 540 {
 541         struct intel_vgpu *vgpu = workload->vgpu;
 542         struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 543         struct intel_vgpu_shadow_bb *bb, *pos;
 544
 545         if (list_empty(&workload->shadow_bb))
 546                 return;
 547
 548         bb = list_first_entry(&workload->shadow_bb,
 549                         struct intel_vgpu_shadow_bb, list);
 550
 551         mutex_lock(&dev_priv->drm.struct_mutex);
 552
 553         list_for_each_entry_safe(bb, pos, &workload->shadow_bb, list) {
 554                 if (bb->obj) {
 555                         if (bb->accessing)
 556                                 i915_gem_obj_finish_shmem_access(bb->obj);
 557
 558                         if (bb->va && !IS_ERR(bb->va))
 559                                 i915_gem_object_unpin_map(bb->obj);
 560
 561                         if (bb->vma && !IS_ERR(bb->vma)) {
 562                                 i915_vma_unpin(bb->vma);
 563                                 i915_vma_close(bb->vma);
 564                         }
 565                         __i915_gem_object_release_unless_active(bb->obj);
 566                 }
 567                 list_del(&bb->list);
 568                 kfree(bb);
 569         }
 570
 571         mutex_unlock(&dev_priv->drm.struct_mutex);
 572 }
 573
 574 static int prepare_workload(struct intel_vgpu_workload *workload)
 575 {
 576         struct intel_vgpu *vgpu = workload->vgpu;
 577         int ret = 0;
 578
 579         ret = intel_vgpu_pin_mm(workload->shadow_mm);
 580         if (ret) {
 581                 gvt_vgpu_err("fail to vgpu pin mm\n");
 582                 return ret;
 583         }
 584
 585         update_shadow_pdps(workload);
 586
 587         ret = intel_vgpu_sync_oos_pages(workload->vgpu);
 588         if (ret) {
 589                 gvt_vgpu_err("fail to vgpu sync oos pages\n");
 590                 goto err_unpin_mm;
 591         }
 592
 593         ret = intel_vgpu_flush_post_shadow(workload->vgpu);
 594         if (ret) {
 595                 gvt_vgpu_err("fail to flush post shadow\n");
 596                 goto err_unpin_mm;
 597         }
 598
 599         ret = copy_workload_to_ring_buffer(workload);
 600         if (ret) {
 601                 gvt_vgpu_err("fail to generate request\n");
 602                 goto err_unpin_mm;
 603         }
 604
 605         ret = prepare_shadow_batch_buffer(workload);
 606         if (ret) {
 607                 gvt_vgpu_err("fail to prepare_shadow_batch_buffer\n");
 608                 goto err_unpin_mm;
 609         }
 610
 611         ret = prepare_shadow_wa_ctx(&workload->wa_ctx);
 612         if (ret) {
 613                 gvt_vgpu_err("fail to prepare_shadow_wa_ctx\n");
 614                 goto err_shadow_batch;
 615         }
 616
 617         if (workload->prepare) {
 618                 ret = workload->prepare(workload);
 619                 if (ret)
 620                         goto err_shadow_wa_ctx;
 621         }
 622
 623         return 0;
 624 err_shadow_wa_ctx:
 625         release_shadow_wa_ctx(&workload->wa_ctx);
 626 err_shadow_batch:
 627         release_shadow_batch_buffer(workload);
 628 err_unpin_mm:
 629         intel_vgpu_unpin_mm(workload->shadow_mm);
 630         return ret;
 631 }
 632
 633 static int dispatch_workload(struct intel_vgpu_workload *workload)
 634 {
 635         struct intel_vgpu *vgpu = workload->vgpu;
 636         struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 637         int ring_id = workload->ring_id;
 638         int ret;
 639
 640         gvt_dbg_sched("ring id %d prepare to dispatch workload %p\n",
 641                 ring_id, workload);
 642
 643         mutex_lock(&vgpu->vgpu_lock);
 644         mutex_lock(&dev_priv->drm.struct_mutex);
 645
 646         ret = intel_gvt_scan_and_shadow_workload(workload);
 647         if (ret)
 648                 goto out;
 649
 650         ret = prepare_workload(workload);
 651
 652 out:
 653         if (ret)
 654                 workload->status = ret;
 655
 656         if (!IS_ERR_OR_NULL(workload->req)) {
 657                 gvt_dbg_sched("ring id %d submit workload to i915 %p\n",
 658                                 ring_id, workload->req);
 659                 i915_request_add(workload->req);
 660                 workload->dispatched = true;
 661         }
 662
 663         mutex_unlock(&dev_priv->drm.struct_mutex);
 664         mutex_unlock(&vgpu->vgpu_lock);
 665         return ret;
 666 }
 667
 668 static struct intel_vgpu_workload *pick_next_workload(
 669                 struct intel_gvt *gvt, int ring_id)
 670 {
 671         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
 672         struct intel_vgpu_workload *workload = NULL;
 673
 674         mutex_lock(&gvt->sched_lock);
 675
 676         /*
 677          * no current vgpu / will be scheduled out / no workload
 678          * bail out
 679          */
 680         if (!scheduler->current_vgpu) {
 681                 gvt_dbg_sched("ring id %d stop - no current vgpu\n", ring_id);
 682                 goto out;
 683         }
 684
 685         if (scheduler->need_reschedule) {
 686                 gvt_dbg_sched("ring id %d stop - will reschedule\n", ring_id);
 687                 goto out;
 688         }
 689
 690         if (list_empty(workload_q_head(scheduler->current_vgpu, ring_id)))
 691                 goto out;
 692
 693         /*
 694          * still have current workload, maybe the workload disptacher
 695          * fail to submit it for some reason, resubmit it.
 696          */
 697         if (scheduler->current_workload[ring_id]) {
 698                 workload = scheduler->current_workload[ring_id];
 699                 gvt_dbg_sched("ring id %d still have current workload %p\n",
 700                                 ring_id, workload);
 701                 goto out;
 702         }
 703
 704         /*
 705          * pick a workload as current workload
 706          * once current workload is set, schedule policy routines
 707          * will wait the current workload is finished when trying to
 708          * schedule out a vgpu.
 709          */
 710         scheduler->current_workload[ring_id] = container_of(
 711                         workload_q_head(scheduler->current_vgpu, ring_id)->next,
 712                         struct intel_vgpu_workload, list);
 713
 714         workload = scheduler->current_workload[ring_id];
 715
 716         gvt_dbg_sched("ring id %d pick new workload %p\n", ring_id, workload);
 717
 718         atomic_inc(&workload->vgpu->submission.running_workload_num);
 719 out:
 720         mutex_unlock(&gvt->sched_lock);
 721         return workload;
 722 }
 723
 724 static void update_guest_context(struct intel_vgpu_workload *workload)
 725 {
 726         struct i915_request *rq = workload->req;
 727         struct intel_vgpu *vgpu = workload->vgpu;
 728         struct intel_gvt *gvt = vgpu->gvt;
 729         struct drm_i915_gem_object *ctx_obj = rq->hw_context->state->obj;
 730         struct execlist_ring_context *shadow_ring_context;
 731         struct page *page;
 732         void *src;
 733         unsigned long context_gpa, context_page_num;
 734         int i;
 735
 736         gvt_dbg_sched("ring id %d workload lrca %x\n", rq->engine->id,
 737                       workload->ctx_desc.lrca);
 738
 739         context_page_num = rq->engine->context_size;
 740         context_page_num = context_page_num >> PAGE_SHIFT;
 741
 742         if (IS_BROADWELL(gvt->dev_priv) && rq->engine->id == RCS)
 743                 context_page_num = 19;
 744
 745         i = 2;
 746
 747         while (i < context_page_num) {
 748                 context_gpa = intel_vgpu_gma_to_gpa(vgpu->gtt.ggtt_mm,
 749                                 (u32)((workload->ctx_desc.lrca + i) <<
 750                                         I915_GTT_PAGE_SHIFT));
 751                 if (context_gpa == INTEL_GVT_INVALID_ADDR) {
 752                         gvt_vgpu_err("invalid guest context descriptor\n");
 753                         return;
 754                 }
 755
 756                 page = i915_gem_object_get_page(ctx_obj, LRC_HEADER_PAGES + i);
 757                 src = kmap(page);
 758                 intel_gvt_hypervisor_write_gpa(vgpu, context_gpa, src,
 759                                 I915_GTT_PAGE_SIZE);
 760                 kunmap(page);
 761                 i++;
 762         }
 763
 764         intel_gvt_hypervisor_write_gpa(vgpu, workload->ring_context_gpa +
 765                 RING_CTX_OFF(ring_header.val), &workload->rb_tail, 4);
 766
 767         page = i915_gem_object_get_page(ctx_obj, LRC_STATE_PN);
 768         shadow_ring_context = kmap(page);
 769
 770 #define COPY_REG(name) \
 771         intel_gvt_hypervisor_write_gpa(vgpu, workload->ring_context_gpa + \
 772                 RING_CTX_OFF(name.val), &shadow_ring_context->name.val, 4)
 773
 774         COPY_REG(ctx_ctrl);
 775         COPY_REG(ctx_timestamp);
 776
 777 #undef COPY_REG
 778
 779         intel_gvt_hypervisor_write_gpa(vgpu,
 780                         workload->ring_context_gpa +
 781                         sizeof(*shadow_ring_context),
 782                         (void *)shadow_ring_context +
 783                         sizeof(*shadow_ring_context),
 784                         I915_GTT_PAGE_SIZE - sizeof(*shadow_ring_context));
 785
 786         kunmap(page);
 787 }
 788
 789 void intel_vgpu_clean_workloads(struct intel_vgpu *vgpu,
 790                                 unsigned long engine_mask)
 791 {
 792         struct intel_vgpu_submission *s = &vgpu->submission;
 793         struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 794         struct intel_engine_cs *engine;
 795         struct intel_vgpu_workload *pos, *n;
 796         unsigned int tmp;
 797
 798         /* free the unsubmited workloads in the queues. */
 799         for_each_engine_masked(engine, dev_priv, engine_mask, tmp) {
 800                 list_for_each_entry_safe(pos, n,
 801                         &s->workload_q_head[engine->id], list) {
 802                         list_del_init(&pos->list);
 803                         intel_vgpu_destroy_workload(pos);
 804                 }
 805                 clear_bit(engine->id, s->shadow_ctx_desc_updated);
 806         }
 807 }
 808
 809 static void complete_current_workload(struct intel_gvt *gvt, int ring_id)
 810 {
 811         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
 812         struct intel_vgpu_workload *workload =
 813                 scheduler->current_workload[ring_id];
 814         struct intel_vgpu *vgpu = workload->vgpu;
 815         struct intel_vgpu_submission *s = &vgpu->submission;
 816         struct i915_request *rq = workload->req;
 817         int event;
 818
 819         mutex_lock(&vgpu->vgpu_lock);
 820         mutex_lock(&gvt->sched_lock);
 821
 822         /* For the workload w/ request, needs to wait for the context
 823          * switch to make sure request is completed.
 824          * For the workload w/o request, directly complete the workload.
 825          */
 826         if (rq) {
 827                 wait_event(workload->shadow_ctx_status_wq,
 828                            !atomic_read(&workload->shadow_ctx_active));
 829
 830                 /* If this request caused GPU hang, req->fence.error will
 831                  * be set to -EIO. Use -EIO to set workload status so
 832                  * that when this request caused GPU hang, didn't trigger
 833                  * context switch interrupt to guest.
 834                  */
 835                 if (likely(workload->status == -EINPROGRESS)) {
 836                         if (workload->req->fence.error == -EIO)
 837                                 workload->status = -EIO;
 838                         else
 839                                 workload->status = 0;
 840                 }
 841
 842                 if (!workload->status && !(vgpu->resetting_eng &
 843                                            ENGINE_MASK(ring_id))) {
 844                         update_guest_context(workload);
 845
 846                         for_each_set_bit(event, workload->pending_events,
 847                                          INTEL_GVT_EVENT_MAX)
 848                                 intel_vgpu_trigger_virtual_event(vgpu, event);
 849                 }
 850
 851                 /* unpin shadow ctx as the shadow_ctx update is done */
 852                 mutex_lock(&rq->i915->drm.struct_mutex);
 853                 intel_context_unpin(rq->hw_context);
 854                 mutex_unlock(&rq->i915->drm.struct_mutex);
 855
 856                 i915_request_put(fetch_and_zero(&workload->req));
 857         }
 858
 859         gvt_dbg_sched("ring id %d complete workload %p status %d\n",
 860                         ring_id, workload, workload->status);
 861
 862         scheduler->current_workload[ring_id] = NULL;
 863
 864         list_del_init(&workload->list);
 865
 866         if (!workload->status) {
 867                 release_shadow_batch_buffer(workload);
 868                 release_shadow_wa_ctx(&workload->wa_ctx);
 869         }
 870
 871         if (workload->status || (vgpu->resetting_eng & ENGINE_MASK(ring_id))) {
 872                 /* if workload->status is not successful means HW GPU
 873                  * has occurred GPU hang or something wrong with i915/GVT,
 874                  * and GVT won't inject context switch interrupt to guest.
 875                  * So this error is a vGPU hang actually to the guest.
 876                  * According to this we should emunlate a vGPU hang. If
 877                  * there are pending workloads which are already submitted
 878                  * from guest, we should clean them up like HW GPU does.
 879                  *
 880                  * if it is in middle of engine resetting, the pending
 881                  * workloads won't be submitted to HW GPU and will be
 882                  * cleaned up during the resetting process later, so doing
 883                  * the workload clean up here doesn't have any impact.
 884                  **/
 885                 intel_vgpu_clean_workloads(vgpu, ENGINE_MASK(ring_id));
 886         }
 887
 888         workload->complete(workload);
 889
 890         atomic_dec(&s->running_workload_num);
 891         wake_up(&scheduler->workload_complete_wq);
 892
 893         if (gvt->scheduler.need_reschedule)
 894                 intel_gvt_request_service(gvt, INTEL_GVT_REQUEST_EVENT_SCHED);
 895
 896         mutex_unlock(&gvt->sched_lock);
 897         mutex_unlock(&vgpu->vgpu_lock);
 898 }
 899
 900 struct workload_thread_param {
 901         struct intel_gvt *gvt;
 902         int ring_id;
 903 };
 904
 905 static int workload_thread(void *priv)
 906 {
 907         struct workload_thread_param *p = (struct workload_thread_param *)priv;
 908         struct intel_gvt *gvt = p->gvt;
 909         int ring_id = p->ring_id;
 910         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
 911         struct intel_vgpu_workload *workload = NULL;
 912         struct intel_vgpu *vgpu = NULL;
 913         int ret;
 914         bool need_force_wake = IS_SKYLAKE(gvt->dev_priv)
 915                         || IS_KABYLAKE(gvt->dev_priv)
 916                         || IS_BROXTON(gvt->dev_priv);
 917         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 918
 919         kfree(p);
 920
 921         gvt_dbg_core("workload thread for ring %d started\n", ring_id);
 922
 923         while (!kthread_should_stop()) {
 924                 add_wait_queue(&scheduler->waitq[ring_id], &wait);
 925                 do {
 926                         workload = pick_next_workload(gvt, ring_id);
 927                         if (workload)
 928                                 break;
 929                         wait_woken(&wait, TASK_INTERRUPTIBLE,
 930                                    MAX_SCHEDULE_TIMEOUT);
 931                 } while (!kthread_should_stop());
 932                 remove_wait_queue(&scheduler->waitq[ring_id], &wait);
 933
 934                 if (!workload)
 935                         break;
 936
 937                 gvt_dbg_sched("ring id %d next workload %p vgpu %d\n",
 938                                 workload->ring_id, workload,
 939                                 workload->vgpu->id);
 940
 941                 intel_runtime_pm_get(gvt->dev_priv);
 942
 943                 gvt_dbg_sched("ring id %d will dispatch workload %p\n",
 944                                 workload->ring_id, workload);
 945
 946                 if (need_force_wake)
 947                         intel_uncore_forcewake_get(gvt->dev_priv,
 948                                         FORCEWAKE_ALL);
 949
 950                 ret = dispatch_workload(workload);
 951
 952                 if (ret) {
 953                         vgpu = workload->vgpu;
 954                         gvt_vgpu_err("fail to dispatch workload, skip\n");
 955                         goto complete;
 956                 }
 957
 958                 gvt_dbg_sched("ring id %d wait workload %p\n",
 959                                 workload->ring_id, workload);
 960                 i915_request_wait(workload->req, 0, MAX_SCHEDULE_TIMEOUT);
 961
 962 complete:
 963                 gvt_dbg_sched("will complete workload %p, status: %d\n",
 964                                 workload, workload->status);
 965
 966                 complete_current_workload(gvt, ring_id);
 967
 968                 if (need_force_wake)
 969                         intel_uncore_forcewake_put(gvt->dev_priv,
 970                                         FORCEWAKE_ALL);
 971
 972                 intel_runtime_pm_put(gvt->dev_priv);
 973                 if (ret && (vgpu_is_vm_unhealthy(ret)))
 974                         enter_failsafe_mode(vgpu, GVT_FAILSAFE_GUEST_ERR);
 975         }
 976         return 0;
 977 }
 978
 979 void intel_gvt_wait_vgpu_idle(struct intel_vgpu *vgpu)
 980 {
 981         struct intel_vgpu_submission *s = &vgpu->submission;
 982         struct intel_gvt *gvt = vgpu->gvt;
 983         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
 984
 985         if (atomic_read(&s->running_workload_num)) {
 986                 gvt_dbg_sched("wait vgpu idle\n");
 987
 988                 wait_event(scheduler->workload_complete_wq,
 989                                 !atomic_read(&s->running_workload_num));
 990         }
 991 }
 992
 993 void intel_gvt_clean_workload_scheduler(struct intel_gvt *gvt)
 994 {
 995         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
 996         struct intel_engine_cs *engine;
 997         enum intel_engine_id i;
 998
 999         gvt_dbg_core("clean workload scheduler\n");
1000
1001         for_each_engine(engine, gvt->dev_priv, i) {
1002                 atomic_notifier_chain_unregister(
1003                                         &engine->context_status_notifier,
1004                                         &gvt->shadow_ctx_notifier_block[i]);
1005                 kthread_stop(scheduler->thread[i]);
1006         }
1007 }
1008
1009 int intel_gvt_init_workload_scheduler(struct intel_gvt *gvt)
1010 {
1011         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
1012         struct workload_thread_param *param = NULL;
1013         struct intel_engine_cs *engine;
1014         enum intel_engine_id i;
1015         int ret;
1016
1017         gvt_dbg_core("init workload scheduler\n");
1018
1019         init_waitqueue_head(&scheduler->workload_complete_wq);
1020
1021         for_each_engine(engine, gvt->dev_priv, i) {
1022                 init_waitqueue_head(&scheduler->waitq[i]);
1023
1024                 param = kzalloc(sizeof(*param), GFP_KERNEL);
1025                 if (!param) {
1026                         ret = -ENOMEM;
1027                         goto err;
1028                 }
1029
1030                 param->gvt = gvt;
1031                 param->ring_id = i;
1032
1033                 scheduler->thread[i] = kthread_run(workload_thread, param,
1034                         "gvt workload %d", i);
1035                 if (IS_ERR(scheduler->thread[i])) {
1036                         gvt_err("fail to create workload thread\n");
1037                         ret = PTR_ERR(scheduler->thread[i]);
1038                         goto err;
1039                 }
1040
1041                 gvt->shadow_ctx_notifier_block[i].notifier_call =
1042                                         shadow_context_status_change;
1043                 atomic_notifier_chain_register(&engine->context_status_notifier,
1044                                         &gvt->shadow_ctx_notifier_block[i]);
1045         }
1046         return 0;
1047 err:
1048         intel_gvt_clean_workload_scheduler(gvt);
1049         kfree(param);
1050         param = NULL;
1051         return ret;
1052 }
1053
1054 /**
1055  * intel_vgpu_clean_submission - free submission-related resource for vGPU
1056  * @vgpu: a vGPU
1057  *
1058  * This function is called when a vGPU is being destroyed.
1059  *
1060  */
1061 void intel_vgpu_clean_submission(struct intel_vgpu *vgpu)
1062 {
1063         struct intel_vgpu_submission *s = &vgpu->submission;
1064
1065         intel_vgpu_select_submission_ops(vgpu, ALL_ENGINES, 0);
1066         i915_gem_context_put(s->shadow_ctx);
1067         kmem_cache_destroy(s->workloads);
1068 }
1069
1070
1071 /**
1072  * intel_vgpu_reset_submission - reset submission-related resource for vGPU
1073  * @vgpu: a vGPU
1074  * @engine_mask: engines expected to be reset
1075  *
1076  * This function is called when a vGPU is being destroyed.
1077  *
1078  */
1079 void intel_vgpu_reset_submission(struct intel_vgpu *vgpu,
1080                 unsigned long engine_mask)
1081 {
1082         struct intel_vgpu_submission *s = &vgpu->submission;
1083
1084         if (!s->active)
1085                 return;
1086
1087         intel_vgpu_clean_workloads(vgpu, engine_mask);
1088         s->ops->reset(vgpu, engine_mask);
1089 }
1090
1091 /**
1092  * intel_vgpu_setup_submission - setup submission-related resource for vGPU
1093  * @vgpu: a vGPU
1094  *
1095  * This function is called when a vGPU is being created.
1096  *
1097  * Returns:
1098  * Zero on success, negative error code if failed.
1099  *
1100  */
1101 int intel_vgpu_setup_submission(struct intel_vgpu *vgpu)
1102 {
1103         struct intel_vgpu_submission *s = &vgpu->submission;
1104         enum intel_engine_id i;
1105         struct intel_engine_cs *engine;
1106         int ret;
1107
1108         s->shadow_ctx = i915_gem_context_create_gvt(
1109                         &vgpu->gvt->dev_priv->drm);
1110         if (IS_ERR(s->shadow_ctx))
1111                 return PTR_ERR(s->shadow_ctx);
1112
1113         bitmap_zero(s->shadow_ctx_desc_updated, I915_NUM_ENGINES);
1114
1115         s->workloads = kmem_cache_create_usercopy("gvt-g_vgpu_workload",
1116                                                   sizeof(struct intel_vgpu_workload), 0,
1117                                                   SLAB_HWCACHE_ALIGN,
1118                                                   offsetof(struct intel_vgpu_workload, rb_tail),
1119                                                   sizeof_field(struct intel_vgpu_workload, rb_tail),
1120                                                   NULL);
1121
1122         if (!s->workloads) {
1123                 ret = -ENOMEM;
1124                 goto out_shadow_ctx;
1125         }
1126
1127         for_each_engine(engine, vgpu->gvt->dev_priv, i)
1128                 INIT_LIST_HEAD(&s->workload_q_head[i]);
1129
1130         atomic_set(&s->running_workload_num, 0);
1131         bitmap_zero(s->tlb_handle_pending, I915_NUM_ENGINES);
1132
1133         return 0;
1134
1135 out_shadow_ctx:
1136         i915_gem_context_put(s->shadow_ctx);
1137         return ret;
1138 }
1139
1140 /**
1141  * intel_vgpu_select_submission_ops - select virtual submission interface
1142  * @vgpu: a vGPU
1143  * @engine_mask: either ALL_ENGINES or target engine mask
1144  * @interface: expected vGPU virtual submission interface
1145  *
1146  * This function is called when guest configures submission interface.
1147  *
1148  * Returns:
1149  * Zero on success, negative error code if failed.
1150  *
1151  */
1152 int intel_vgpu_select_submission_ops(struct intel_vgpu *vgpu,
1153                                      unsigned long engine_mask,
1154                                      unsigned int interface)
1155 {
1156         struct intel_vgpu_submission *s = &vgpu->submission;
1157         const struct intel_vgpu_submission_ops *ops[] = {
1158                 [INTEL_VGPU_EXECLIST_SUBMISSION] =
1159                         &intel_vgpu_execlist_submission_ops,
1160         };
1161         int ret;
1162
1163         if (WARN_ON(interface >= ARRAY_SIZE(ops)))
1164                 return -EINVAL;
1165
1166         if (WARN_ON(interface == 0 && engine_mask != ALL_ENGINES))
1167                 return -EINVAL;
1168
1169         if (s->active)
1170                 s->ops->clean(vgpu, engine_mask);
1171
1172         if (interface == 0) {
1173                 s->ops = NULL;
1174                 s->virtual_submission_interface = 0;
1175                 s->active = false;
1176                 gvt_dbg_core("vgpu%d: remove submission ops\n", vgpu->id);
1177                 return 0;
1178         }
1179
1180         ret = ops[interface]->init(vgpu, engine_mask);
1181         if (ret)
1182                 return ret;
1183
1184         s->ops = ops[interface];
1185         s->virtual_submission_interface = interface;
1186         s->active = true;
1187
1188         gvt_dbg_core("vgpu%d: activate ops [ %s ]\n",
1189                         vgpu->id, s->ops->name);
1190
1191         return 0;
1192 }
1193
1194 /**
1195  * intel_vgpu_destroy_workload - destroy a vGPU workload
1196  * @workload: workload to destroy
1197  *
1198  * This function is called when destroy a vGPU workload.
1199  *
1200  */
1201 void intel_vgpu_destroy_workload(struct intel_vgpu_workload *workload)
1202 {
1203         struct intel_vgpu_submission *s = &workload->vgpu->submission;
1204
1205         if (workload->shadow_mm)
1206                 intel_vgpu_mm_put(workload->shadow_mm);
1207
1208         kmem_cache_free(s->workloads, workload);
1209 }
1210
1211 static struct intel_vgpu_workload *
1212 alloc_workload(struct intel_vgpu *vgpu)
1213 {
1214         struct intel_vgpu_submission *s = &vgpu->submission;
1215         struct intel_vgpu_workload *workload;
1216
1217         workload = kmem_cache_zalloc(s->workloads, GFP_KERNEL);
1218         if (!workload)
1219                 return ERR_PTR(-ENOMEM);
1220
1221         INIT_LIST_HEAD(&workload->list);
1222         INIT_LIST_HEAD(&workload->shadow_bb);
1223
1224         init_waitqueue_head(&workload->shadow_ctx_status_wq);
1225         atomic_set(&workload->shadow_ctx_active, 0);
1226
1227         workload->status = -EINPROGRESS;
1228         workload->vgpu = vgpu;
1229
1230         return workload;
1231 }
1232
1233 #define RING_CTX_OFF(x) \
1234         offsetof(struct execlist_ring_context, x)
1235
1236 static void read_guest_pdps(struct intel_vgpu *vgpu,
1237                 u64 ring_context_gpa, u32 pdp[8])
1238 {
1239         u64 gpa;
1240         int i;
1241
1242         gpa = ring_context_gpa + RING_CTX_OFF(pdps[0].val);
1243
1244         for (i = 0; i < 8; i++)
1245                 intel_gvt_hypervisor_read_gpa(vgpu,
1246                                 gpa + i * 8, &pdp[7 - i], 4);
1247 }
1248
1249 static int prepare_mm(struct intel_vgpu_workload *workload)
1250 {
1251         struct execlist_ctx_descriptor_format *desc = &workload->ctx_desc;
1252         struct intel_vgpu_mm *mm;
1253         struct intel_vgpu *vgpu = workload->vgpu;
1254         intel_gvt_gtt_type_t root_entry_type;
1255         u64 pdps[GVT_RING_CTX_NR_PDPS];
1256
1257         switch (desc->addressing_mode) {
1258         case 1: /* legacy 32-bit */
1259                 root_entry_type = GTT_TYPE_PPGTT_ROOT_L3_ENTRY;
1260                 break;
1261         case 3: /* legacy 64-bit */
1262                 root_entry_type = GTT_TYPE_PPGTT_ROOT_L4_ENTRY;
1263                 break;
1264         default:
1265                 gvt_vgpu_err("Advanced Context mode(SVM) is not supported!\n");
1266                 return -EINVAL;
1267         }
1268
1269         read_guest_pdps(workload->vgpu, workload->ring_context_gpa, (void *)pdps);
1270
1271         mm = intel_vgpu_get_ppgtt_mm(workload->vgpu, root_entry_type, pdps);
1272         if (IS_ERR(mm))
1273                 return PTR_ERR(mm);
1274
1275         workload->shadow_mm = mm;
1276         return 0;
1277 }
1278
1279 #define same_context(a, b) (((a)->context_id == (b)->context_id) && \
1280                 ((a)->lrca == (b)->lrca))
1281
1282 #define get_last_workload(q) \
1283         (list_empty(q) ? NULL : container_of(q->prev, \
1284         struct intel_vgpu_workload, list))
1285 /**
1286  * intel_vgpu_create_workload - create a vGPU workload
1287  * @vgpu: a vGPU
1288  * @ring_id: ring index
1289  * @desc: a guest context descriptor
1290  *
1291  * This function is called when creating a vGPU workload.
1292  *
1293  * Returns:
1294  * struct intel_vgpu_workload * on success, negative error code in
1295  * pointer if failed.
1296  *
1297  */
1298 struct intel_vgpu_workload *
1299 intel_vgpu_create_workload(struct intel_vgpu *vgpu, int ring_id,
1300                            struct execlist_ctx_descriptor_format *desc)
1301 {
1302         struct intel_vgpu_submission *s = &vgpu->submission;
1303         struct list_head *q = workload_q_head(vgpu, ring_id);
1304         struct intel_vgpu_workload *last_workload = get_last_workload(q);
1305         struct intel_vgpu_workload *workload = NULL;
1306         struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
1307         u64 ring_context_gpa;
1308         u32 head, tail, start, ctl, ctx_ctl, per_ctx, indirect_ctx;
1309         int ret;
1310
1311         ring_context_gpa = intel_vgpu_gma_to_gpa(vgpu->gtt.ggtt_mm,
1312                         (u32)((desc->lrca + 1) << I915_GTT_PAGE_SHIFT));
1313         if (ring_context_gpa == INTEL_GVT_INVALID_ADDR) {
1314                 gvt_vgpu_err("invalid guest context LRCA: %x\n", desc->lrca);
1315                 return ERR_PTR(-EINVAL);
1316         }
1317
1318         intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
1319                         RING_CTX_OFF(ring_header.val), &head, 4);
1320
1321         intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
1322                         RING_CTX_OFF(ring_tail.val), &tail, 4);
1323
1324         head &= RB_HEAD_OFF_MASK;
1325         tail &= RB_TAIL_OFF_MASK;
1326
1327         if (last_workload && same_context(&last_workload->ctx_desc, desc)) {
1328                 gvt_dbg_el("ring id %d cur workload == last\n", ring_id);
1329                 gvt_dbg_el("ctx head %x real head %lx\n", head,
1330                                 last_workload->rb_tail);
1331                 /*
1332                  * cannot use guest context head pointer here,
1333                  * as it might not be updated at this time
1334                  */
1335                 head = last_workload->rb_tail;
1336         }
1337
1338         gvt_dbg_el("ring id %d begin a new workload\n", ring_id);
1339
1340         /* record some ring buffer register values for scan and shadow */
1341         intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
1342                         RING_CTX_OFF(rb_start.val), &start, 4);
1343         intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
1344                         RING_CTX_OFF(rb_ctrl.val), &ctl, 4);
1345         intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
1346                         RING_CTX_OFF(ctx_ctrl.val), &ctx_ctl, 4);
1347
1348         workload = alloc_workload(vgpu);
1349         if (IS_ERR(workload))
1350                 return workload;
1351
1352         workload->ring_id = ring_id;
1353         workload->ctx_desc = *desc;
1354         workload->ring_context_gpa = ring_context_gpa;
1355         workload->rb_head = head;
1356         workload->rb_tail = tail;
1357         workload->rb_start = start;
1358         workload->rb_ctl = ctl;
1359
1360         if (ring_id == RCS) {
1361                 intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
1362                         RING_CTX_OFF(bb_per_ctx_ptr.val), &per_ctx, 4);
1363                 intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
1364                         RING_CTX_OFF(rcs_indirect_ctx.val), &indirect_ctx, 4);
1365
1366                 workload->wa_ctx.indirect_ctx.guest_gma =
1367                         indirect_ctx & INDIRECT_CTX_ADDR_MASK;
1368                 workload->wa_ctx.indirect_ctx.size =
1369                         (indirect_ctx & INDIRECT_CTX_SIZE_MASK) *
1370                         CACHELINE_BYTES;
1371                 workload->wa_ctx.per_ctx.guest_gma =
1372                         per_ctx & PER_CTX_ADDR_MASK;
1373                 workload->wa_ctx.per_ctx.valid = per_ctx & 1;
1374         }
1375
1376         gvt_dbg_el("workload %p ring id %d head %x tail %x start %x ctl %x\n",
1377                         workload, ring_id, head, tail, start, ctl);
1378
1379         ret = prepare_mm(workload);
1380         if (ret) {
1381                 kmem_cache_free(s->workloads, workload);
1382                 return ERR_PTR(ret);
1383         }
1384
1385         /* Only scan and shadow the first workload in the queue
1386          * as there is only one pre-allocated buf-obj for shadow.
1387          */
1388         if (list_empty(workload_q_head(vgpu, ring_id))) {
1389                 intel_runtime_pm_get(dev_priv);
1390                 mutex_lock(&dev_priv->drm.struct_mutex);
1391                 ret = intel_gvt_scan_and_shadow_workload(workload);
1392                 mutex_unlock(&dev_priv->drm.struct_mutex);
1393                 intel_runtime_pm_put(dev_priv);
1394         }
1395
1396         if (ret && (vgpu_is_vm_unhealthy(ret))) {
1397                 enter_failsafe_mode(vgpu, GVT_FAILSAFE_GUEST_ERR);
1398                 intel_vgpu_destroy_workload(workload);
1399                 return ERR_PTR(ret);
1400         }
1401
1402         return workload;
1403 }
1404
1405 /**
1406  * intel_vgpu_queue_workload - Qeue a vGPU workload
1407  * @workload: the workload to queue in
1408  */
1409 void intel_vgpu_queue_workload(struct intel_vgpu_workload *workload)
1410 {
1411         list_add_tail(&workload->list,
1412                 workload_q_head(workload->vgpu, workload->ring_id));
1413         intel_gvt_kick_schedule(workload->vgpu->gvt);
1414         wake_up(&workload->vgpu->gvt->scheduler.waitq[workload->ring_id]);
1415 }