root/drivers/gpu/drm/i915/gvt/vgpu.c

DEFINITIONS

1. populate_pvinfo_page
2. intel_gvt_init_vgpu_types
3. intel_gvt_clean_vgpu_types
4. intel_gvt_update_vgpu_types
5. intel_gvt_activate_vgpu
6. intel_gvt_deactivate_vgpu
7. intel_gvt_release_vgpu
8. intel_gvt_destroy_vgpu
9. intel_gvt_create_idle_vgpu
10. intel_gvt_destroy_idle_vgpu
11. __intel_gvt_create_vgpu
12. intel_gvt_create_vgpu
13. intel_gvt_reset_vgpu_locked
14. intel_gvt_reset_vgpu

   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  *    Eddie Dong <eddie.dong@intel.com>
  25  *    Kevin Tian <kevin.tian@intel.com>
  26  *
  27  * Contributors:
  28  *    Ping Gao <ping.a.gao@intel.com>
  29  *    Zhi Wang <zhi.a.wang@intel.com>
  30  *    Bing Niu <bing.niu@intel.com>
  31  *
  32  */
  33 
  34 #include "i915_drv.h"
  35 #include "gvt.h"
  36 #include "i915_pvinfo.h"
  37 
  38 void populate_pvinfo_page(struct intel_vgpu *vgpu)
  39 {
  40         /* setup the ballooning information */
  41         vgpu_vreg64_t(vgpu, vgtif_reg(magic)) = VGT_MAGIC;
  42         vgpu_vreg_t(vgpu, vgtif_reg(version_major)) = 1;
  43         vgpu_vreg_t(vgpu, vgtif_reg(version_minor)) = 0;
  44         vgpu_vreg_t(vgpu, vgtif_reg(display_ready)) = 0;
  45         vgpu_vreg_t(vgpu, vgtif_reg(vgt_id)) = vgpu->id;
  46 
  47         vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) = VGT_CAPS_FULL_PPGTT;
  48         vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) |= VGT_CAPS_HWSP_EMULATION;
  49         vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) |= VGT_CAPS_HUGE_GTT;
  50 
  51         vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.mappable_gmadr.base)) =
  52                 vgpu_aperture_gmadr_base(vgpu);
  53         vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.mappable_gmadr.size)) =
  54                 vgpu_aperture_sz(vgpu);
  55         vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.nonmappable_gmadr.base)) =
  56                 vgpu_hidden_gmadr_base(vgpu);
  57         vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.nonmappable_gmadr.size)) =
  58                 vgpu_hidden_sz(vgpu);
  59 
  60         vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.fence_num)) = vgpu_fence_sz(vgpu);
  61 
  62         vgpu_vreg_t(vgpu, vgtif_reg(cursor_x_hot)) = UINT_MAX;
  63         vgpu_vreg_t(vgpu, vgtif_reg(cursor_y_hot)) = UINT_MAX;
  64 
  65         gvt_dbg_core("Populate PVINFO PAGE for vGPU %d\n", vgpu->id);
  66         gvt_dbg_core("aperture base [GMADR] 0x%llx size 0x%llx\n",
  67                 vgpu_aperture_gmadr_base(vgpu), vgpu_aperture_sz(vgpu));
  68         gvt_dbg_core("hidden base [GMADR] 0x%llx size=0x%llx\n",
  69                 vgpu_hidden_gmadr_base(vgpu), vgpu_hidden_sz(vgpu));
  70         gvt_dbg_core("fence size %d\n", vgpu_fence_sz(vgpu));
  71 
  72         WARN_ON(sizeof(struct vgt_if) != VGT_PVINFO_SIZE);
  73 }
  74 
  75 #define VGPU_MAX_WEIGHT 16
  76 #define VGPU_WEIGHT(vgpu_num)   \
  77         (VGPU_MAX_WEIGHT / (vgpu_num))
  78 
  79 static struct {
  80         unsigned int low_mm;
  81         unsigned int high_mm;
  82         unsigned int fence;
  83 
  84         /* A vGPU with a weight of 8 will get twice as much GPU as a vGPU
  85          * with a weight of 4 on a contended host, different vGPU type has
  86          * different weight set. Legal weights range from 1 to 16.
  87          */
  88         unsigned int weight;
  89         enum intel_vgpu_edid edid;
  90         char *name;
  91 } vgpu_types[] = {
  92 /* Fixed vGPU type table */
  93         { MB_TO_BYTES(64), MB_TO_BYTES(384), 4, VGPU_WEIGHT(8), GVT_EDID_1024_768, "8" },
  94         { MB_TO_BYTES(128), MB_TO_BYTES(512), 4, VGPU_WEIGHT(4), GVT_EDID_1920_1200, "4" },
  95         { MB_TO_BYTES(256), MB_TO_BYTES(1024), 4, VGPU_WEIGHT(2), GVT_EDID_1920_1200, "2" },
  96         { MB_TO_BYTES(512), MB_TO_BYTES(2048), 4, VGPU_WEIGHT(1), GVT_EDID_1920_1200, "1" },
  97 };
  98 
  99 /**
 100  * intel_gvt_init_vgpu_types - initialize vGPU type list
 101  * @gvt : GVT device
 102  *
 103  * Initialize vGPU type list based on available resource.
 104  *
 105  */
 106 int intel_gvt_init_vgpu_types(struct intel_gvt *gvt)
 107 {
 108         unsigned int num_types;
 109         unsigned int i, low_avail, high_avail;
 110         unsigned int min_low;
 111 
 112         /* vGPU type name is defined as GVTg_Vx_y which contains
 113          * physical GPU generation type (e.g V4 as BDW server, V5 as
 114          * SKL server).
 115          *
 116          * Depend on physical SKU resource, might see vGPU types like
 117          * GVTg_V4_8, GVTg_V4_4, GVTg_V4_2, etc. We can create
 118          * different types of vGPU on same physical GPU depending on
 119          * available resource. Each vGPU type will have "avail_instance"
 120          * to indicate how many vGPU instance can be created for this
 121          * type.
 122          *
 123          */
 124         low_avail = gvt_aperture_sz(gvt) - HOST_LOW_GM_SIZE;
 125         high_avail = gvt_hidden_sz(gvt) - HOST_HIGH_GM_SIZE;
 126         num_types = sizeof(vgpu_types) / sizeof(vgpu_types[0]);
 127 
 128         gvt->types = kcalloc(num_types, sizeof(struct intel_vgpu_type),
 129                              GFP_KERNEL);
 130         if (!gvt->types)
 131                 return -ENOMEM;
 132 
 133         min_low = MB_TO_BYTES(32);
 134         for (i = 0; i < num_types; ++i) {
 135                 if (low_avail / vgpu_types[i].low_mm == 0)
 136                         break;
 137 
 138                 gvt->types[i].low_gm_size = vgpu_types[i].low_mm;
 139                 gvt->types[i].high_gm_size = vgpu_types[i].high_mm;
 140                 gvt->types[i].fence = vgpu_types[i].fence;
 141 
 142                 if (vgpu_types[i].weight < 1 ||
 143                                         vgpu_types[i].weight > VGPU_MAX_WEIGHT)
 144                         return -EINVAL;
 145 
 146                 gvt->types[i].weight = vgpu_types[i].weight;
 147                 gvt->types[i].resolution = vgpu_types[i].edid;
 148                 gvt->types[i].avail_instance = min(low_avail / vgpu_types[i].low_mm,
 149                                                    high_avail / vgpu_types[i].high_mm);
 150 
 151                 if (IS_GEN(gvt->dev_priv, 8))
 152                         sprintf(gvt->types[i].name, "GVTg_V4_%s",
 153                                                 vgpu_types[i].name);
 154                 else if (IS_GEN(gvt->dev_priv, 9))
 155                         sprintf(gvt->types[i].name, "GVTg_V5_%s",
 156                                                 vgpu_types[i].name);
 157 
 158                 gvt_dbg_core("type[%d]: %s avail %u low %u high %u fence %u weight %u res %s\n",
 159                              i, gvt->types[i].name,
 160                              gvt->types[i].avail_instance,
 161                              gvt->types[i].low_gm_size,
 162                              gvt->types[i].high_gm_size, gvt->types[i].fence,
 163                              gvt->types[i].weight,
 164                              vgpu_edid_str(gvt->types[i].resolution));
 165         }
 166 
 167         gvt->num_types = i;
 168         return 0;
 169 }
 170 
 171 void intel_gvt_clean_vgpu_types(struct intel_gvt *gvt)
 172 {
 173         kfree(gvt->types);
 174 }
 175 
 176 static void intel_gvt_update_vgpu_types(struct intel_gvt *gvt)
 177 {
 178         int i;
 179         unsigned int low_gm_avail, high_gm_avail, fence_avail;
 180         unsigned int low_gm_min, high_gm_min, fence_min;
 181 
 182         /* Need to depend on maxium hw resource size but keep on
 183          * static config for now.
 184          */
 185         low_gm_avail = gvt_aperture_sz(gvt) - HOST_LOW_GM_SIZE -
 186                 gvt->gm.vgpu_allocated_low_gm_size;
 187         high_gm_avail = gvt_hidden_sz(gvt) - HOST_HIGH_GM_SIZE -
 188                 gvt->gm.vgpu_allocated_high_gm_size;
 189         fence_avail = gvt_fence_sz(gvt) - HOST_FENCE -
 190                 gvt->fence.vgpu_allocated_fence_num;
 191 
 192         for (i = 0; i < gvt->num_types; i++) {
 193                 low_gm_min = low_gm_avail / gvt->types[i].low_gm_size;
 194                 high_gm_min = high_gm_avail / gvt->types[i].high_gm_size;
 195                 fence_min = fence_avail / gvt->types[i].fence;
 196                 gvt->types[i].avail_instance = min(min(low_gm_min, high_gm_min),
 197                                                    fence_min);
 198 
 199                 gvt_dbg_core("update type[%d]: %s avail %u low %u high %u fence %u\n",
 200                        i, gvt->types[i].name,
 201                        gvt->types[i].avail_instance, gvt->types[i].low_gm_size,
 202                        gvt->types[i].high_gm_size, gvt->types[i].fence);
 203         }
 204 }
 205 
 206 /**
 207  * intel_gvt_active_vgpu - activate a virtual GPU
 208  * @vgpu: virtual GPU
 209  *
 210  * This function is called when user wants to activate a virtual GPU.
 211  *
 212  */
 213 void intel_gvt_activate_vgpu(struct intel_vgpu *vgpu)
 214 {
 215         mutex_lock(&vgpu->gvt->lock);
 216         vgpu->active = true;
 217         mutex_unlock(&vgpu->gvt->lock);
 218 }
 219 
 220 /**
 221  * intel_gvt_deactive_vgpu - deactivate a virtual GPU
 222  * @vgpu: virtual GPU
 223  *
 224  * This function is called when user wants to deactivate a virtual GPU.
 225  * The virtual GPU will be stopped.
 226  *
 227  */
 228 void intel_gvt_deactivate_vgpu(struct intel_vgpu *vgpu)
 229 {
 230         mutex_lock(&vgpu->vgpu_lock);
 231 
 232         vgpu->active = false;
 233 
 234         if (atomic_read(&vgpu->submission.running_workload_num)) {
 235                 mutex_unlock(&vgpu->vgpu_lock);
 236                 intel_gvt_wait_vgpu_idle(vgpu);
 237                 mutex_lock(&vgpu->vgpu_lock);
 238         }
 239 
 240         intel_vgpu_stop_schedule(vgpu);
 241 
 242         mutex_unlock(&vgpu->vgpu_lock);
 243 }
 244 
 245 /**
 246  * intel_gvt_release_vgpu - release a virtual GPU
 247  * @vgpu: virtual GPU
 248  *
 249  * This function is called when user wants to release a virtual GPU.
 250  * The virtual GPU will be stopped and all runtime information will be
 251  * destroyed.
 252  *
 253  */
 254 void intel_gvt_release_vgpu(struct intel_vgpu *vgpu)
 255 {
 256         intel_gvt_deactivate_vgpu(vgpu);
 257 
 258         mutex_lock(&vgpu->vgpu_lock);
 259         intel_vgpu_clean_workloads(vgpu, ALL_ENGINES);
 260         intel_vgpu_dmabuf_cleanup(vgpu);
 261         mutex_unlock(&vgpu->vgpu_lock);
 262 }
 263 
 264 /**
 265  * intel_gvt_destroy_vgpu - destroy a virtual GPU
 266  * @vgpu: virtual GPU
 267  *
 268  * This function is called when user wants to destroy a virtual GPU.
 269  *
 270  */
 271 void intel_gvt_destroy_vgpu(struct intel_vgpu *vgpu)
 272 {
 273         struct intel_gvt *gvt = vgpu->gvt;
 274 
 275         WARN(vgpu->active, "vGPU is still active!\n");
 276 
 277         /*
 278          * remove idr first so later clean can judge if need to stop
 279          * service if no active vgpu.
 280          */
 281         mutex_lock(&gvt->lock);
 282         idr_remove(&gvt->vgpu_idr, vgpu->id);
 283         mutex_unlock(&gvt->lock);
 284 
 285         mutex_lock(&vgpu->vgpu_lock);
 286         intel_gvt_debugfs_remove_vgpu(vgpu);
 287         intel_vgpu_clean_sched_policy(vgpu);
 288         intel_vgpu_clean_submission(vgpu);
 289         intel_vgpu_clean_display(vgpu);
 290         intel_vgpu_clean_opregion(vgpu);
 291         intel_vgpu_reset_ggtt(vgpu, true);
 292         intel_vgpu_clean_gtt(vgpu);
 293         intel_gvt_hypervisor_detach_vgpu(vgpu);
 294         intel_vgpu_free_resource(vgpu);
 295         intel_vgpu_clean_mmio(vgpu);
 296         intel_vgpu_dmabuf_cleanup(vgpu);
 297         mutex_unlock(&vgpu->vgpu_lock);
 298 
 299         mutex_lock(&gvt->lock);
 300         if (idr_is_empty(&gvt->vgpu_idr))
 301                 intel_gvt_clean_irq(gvt);
 302         intel_gvt_update_vgpu_types(gvt);
 303         mutex_unlock(&gvt->lock);
 304 
 305         vfree(vgpu);
 306 }
 307 
 308 #define IDLE_VGPU_IDR 0
 309 
 310 /**
 311  * intel_gvt_create_idle_vgpu - create an idle virtual GPU
 312  * @gvt: GVT device
 313  *
 314  * This function is called when user wants to create an idle virtual GPU.
 315  *
 316  * Returns:
 317  * pointer to intel_vgpu, error pointer if failed.
 318  */
 319 struct intel_vgpu *intel_gvt_create_idle_vgpu(struct intel_gvt *gvt)
 320 {
 321         struct intel_vgpu *vgpu;
 322         enum intel_engine_id i;
 323         int ret;
 324 
 325         vgpu = vzalloc(sizeof(*vgpu));
 326         if (!vgpu)
 327                 return ERR_PTR(-ENOMEM);
 328 
 329         vgpu->id = IDLE_VGPU_IDR;
 330         vgpu->gvt = gvt;
 331         mutex_init(&vgpu->vgpu_lock);
 332 
 333         for (i = 0; i < I915_NUM_ENGINES; i++)
 334                 INIT_LIST_HEAD(&vgpu->submission.workload_q_head[i]);
 335 
 336         ret = intel_vgpu_init_sched_policy(vgpu);
 337         if (ret)
 338                 goto out_free_vgpu;
 339 
 340         vgpu->active = false;
 341 
 342         return vgpu;
 343 
 344 out_free_vgpu:
 345         vfree(vgpu);
 346         return ERR_PTR(ret);
 347 }
 348 
 349 /**
 350  * intel_gvt_destroy_vgpu - destroy an idle virtual GPU
 351  * @vgpu: virtual GPU
 352  *
 353  * This function is called when user wants to destroy an idle virtual GPU.
 354  *
 355  */
 356 void intel_gvt_destroy_idle_vgpu(struct intel_vgpu *vgpu)
 357 {
 358         mutex_lock(&vgpu->vgpu_lock);
 359         intel_vgpu_clean_sched_policy(vgpu);
 360         mutex_unlock(&vgpu->vgpu_lock);
 361 
 362         vfree(vgpu);
 363 }
 364 
 365 static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt,
 366                 struct intel_vgpu_creation_params *param)
 367 {
 368         struct intel_vgpu *vgpu;
 369         int ret;
 370 
 371         gvt_dbg_core("handle %llu low %llu MB high %llu MB fence %llu\n",
 372                         param->handle, param->low_gm_sz, param->high_gm_sz,
 373                         param->fence_sz);
 374 
 375         vgpu = vzalloc(sizeof(*vgpu));
 376         if (!vgpu)
 377                 return ERR_PTR(-ENOMEM);
 378 
 379         ret = idr_alloc(&gvt->vgpu_idr, vgpu, IDLE_VGPU_IDR + 1, GVT_MAX_VGPU,
 380                 GFP_KERNEL);
 381         if (ret < 0)
 382                 goto out_free_vgpu;
 383 
 384         vgpu->id = ret;
 385         vgpu->handle = param->handle;
 386         vgpu->gvt = gvt;
 387         vgpu->sched_ctl.weight = param->weight;
 388         mutex_init(&vgpu->vgpu_lock);
 389         mutex_init(&vgpu->dmabuf_lock);
 390         INIT_LIST_HEAD(&vgpu->dmabuf_obj_list_head);
 391         INIT_RADIX_TREE(&vgpu->page_track_tree, GFP_KERNEL);
 392         idr_init(&vgpu->object_idr);
 393         intel_vgpu_init_cfg_space(vgpu, param->primary);
 394 
 395         ret = intel_vgpu_init_mmio(vgpu);
 396         if (ret)
 397                 goto out_clean_idr;
 398 
 399         ret = intel_vgpu_alloc_resource(vgpu, param);
 400         if (ret)
 401                 goto out_clean_vgpu_mmio;
 402 
 403         populate_pvinfo_page(vgpu);
 404 
 405         ret = intel_gvt_hypervisor_attach_vgpu(vgpu);
 406         if (ret)
 407                 goto out_clean_vgpu_resource;
 408 
 409         ret = intel_vgpu_init_gtt(vgpu);
 410         if (ret)
 411                 goto out_detach_hypervisor_vgpu;
 412 
 413         ret = intel_vgpu_init_opregion(vgpu);
 414         if (ret)
 415                 goto out_clean_gtt;
 416 
 417         ret = intel_vgpu_init_display(vgpu, param->resolution);
 418         if (ret)
 419                 goto out_clean_opregion;
 420 
 421         ret = intel_vgpu_setup_submission(vgpu);
 422         if (ret)
 423                 goto out_clean_display;
 424 
 425         ret = intel_vgpu_init_sched_policy(vgpu);
 426         if (ret)
 427                 goto out_clean_submission;
 428 
 429         intel_gvt_debugfs_add_vgpu(vgpu);
 430 
 431         ret = intel_gvt_hypervisor_set_opregion(vgpu);
 432         if (ret)
 433                 goto out_clean_sched_policy;
 434 
 435         /*TODO: add more platforms support */
 436         if (IS_SKYLAKE(gvt->dev_priv) || IS_KABYLAKE(gvt->dev_priv))
 437                 ret = intel_gvt_hypervisor_set_edid(vgpu, PORT_D);
 438         if (ret)
 439                 goto out_clean_sched_policy;
 440 
 441         return vgpu;
 442 
 443 out_clean_sched_policy:
 444         intel_vgpu_clean_sched_policy(vgpu);
 445 out_clean_submission:
 446         intel_vgpu_clean_submission(vgpu);
 447 out_clean_display:
 448         intel_vgpu_clean_display(vgpu);
 449 out_clean_opregion:
 450         intel_vgpu_clean_opregion(vgpu);
 451 out_clean_gtt:
 452         intel_vgpu_clean_gtt(vgpu);
 453 out_detach_hypervisor_vgpu:
 454         intel_gvt_hypervisor_detach_vgpu(vgpu);
 455 out_clean_vgpu_resource:
 456         intel_vgpu_free_resource(vgpu);
 457 out_clean_vgpu_mmio:
 458         intel_vgpu_clean_mmio(vgpu);
 459 out_clean_idr:
 460         idr_remove(&gvt->vgpu_idr, vgpu->id);
 461 out_free_vgpu:
 462         vfree(vgpu);
 463         return ERR_PTR(ret);
 464 }
 465 
 466 /**
 467  * intel_gvt_create_vgpu - create a virtual GPU
 468  * @gvt: GVT device
 469  * @type: type of the vGPU to create
 470  *
 471  * This function is called when user wants to create a virtual GPU.
 472  *
 473  * Returns:
 474  * pointer to intel_vgpu, error pointer if failed.
 475  */
 476 struct intel_vgpu *intel_gvt_create_vgpu(struct intel_gvt *gvt,
 477                                 struct intel_vgpu_type *type)
 478 {
 479         struct intel_vgpu_creation_params param;
 480         struct intel_vgpu *vgpu;
 481 
 482         param.handle = 0;
 483         param.primary = 1;
 484         param.low_gm_sz = type->low_gm_size;
 485         param.high_gm_sz = type->high_gm_size;
 486         param.fence_sz = type->fence;
 487         param.weight = type->weight;
 488         param.resolution = type->resolution;
 489 
 490         /* XXX current param based on MB */
 491         param.low_gm_sz = BYTES_TO_MB(param.low_gm_sz);
 492         param.high_gm_sz = BYTES_TO_MB(param.high_gm_sz);
 493 
 494         mutex_lock(&gvt->lock);
 495         vgpu = __intel_gvt_create_vgpu(gvt, &param);
 496         if (!IS_ERR(vgpu))
 497                 /* calculate left instance change for types */
 498                 intel_gvt_update_vgpu_types(gvt);
 499         mutex_unlock(&gvt->lock);
 500 
 501         return vgpu;
 502 }
 503 
 504 /**
 505  * intel_gvt_reset_vgpu_locked - reset a virtual GPU by DMLR or GT reset
 506  * @vgpu: virtual GPU
 507  * @dmlr: vGPU Device Model Level Reset or GT Reset
 508  * @engine_mask: engines to reset for GT reset
 509  *
 510  * This function is called when user wants to reset a virtual GPU through
 511  * device model reset or GT reset. The caller should hold the vgpu lock.
 512  *
 513  * vGPU Device Model Level Reset (DMLR) simulates the PCI level reset to reset
 514  * the whole vGPU to default state as when it is created. This vGPU function
 515  * is required both for functionary and security concerns.The ultimate goal
 516  * of vGPU FLR is that reuse a vGPU instance by virtual machines. When we
 517  * assign a vGPU to a virtual machine we must isse such reset first.
 518  *
 519  * Full GT Reset and Per-Engine GT Reset are soft reset flow for GPU engines
 520  * (Render, Blitter, Video, Video Enhancement). It is defined by GPU Spec.
 521  * Unlike the FLR, GT reset only reset particular resource of a vGPU per
 522  * the reset request. Guest driver can issue a GT reset by programming the
 523  * virtual GDRST register to reset specific virtual GPU engine or all
 524  * engines.
 525  *
 526  * The parameter dev_level is to identify if we will do DMLR or GT reset.
 527  * The parameter engine_mask is to specific the engines that need to be
 528  * resetted. If value ALL_ENGINES is given for engine_mask, it means
 529  * the caller requests a full GT reset that we will reset all virtual
 530  * GPU engines. For FLR, engine_mask is ignored.
 531  */
 532 void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
 533                                  intel_engine_mask_t engine_mask)
 534 {
 535         struct intel_gvt *gvt = vgpu->gvt;
 536         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
 537         intel_engine_mask_t resetting_eng = dmlr ? ALL_ENGINES : engine_mask;
 538 
 539         gvt_dbg_core("------------------------------------------\n");
 540         gvt_dbg_core("resseting vgpu%d, dmlr %d, engine_mask %08x\n",
 541                      vgpu->id, dmlr, engine_mask);
 542 
 543         vgpu->resetting_eng = resetting_eng;
 544 
 545         intel_vgpu_stop_schedule(vgpu);
 546         /*
 547          * The current_vgpu will set to NULL after stopping the
 548          * scheduler when the reset is triggered by current vgpu.
 549          */
 550         if (scheduler->current_vgpu == NULL) {
 551                 mutex_unlock(&vgpu->vgpu_lock);
 552                 intel_gvt_wait_vgpu_idle(vgpu);
 553                 mutex_lock(&vgpu->vgpu_lock);
 554         }
 555 
 556         intel_vgpu_reset_submission(vgpu, resetting_eng);
 557         /* full GPU reset or device model level reset */
 558         if (engine_mask == ALL_ENGINES || dmlr) {
 559                 intel_vgpu_select_submission_ops(vgpu, ALL_ENGINES, 0);
 560                 intel_vgpu_invalidate_ppgtt(vgpu);
 561                 /*fence will not be reset during virtual reset */
 562                 if (dmlr) {
 563                         intel_vgpu_reset_gtt(vgpu);
 564                         intel_vgpu_reset_resource(vgpu);
 565                 }
 566 
 567                 intel_vgpu_reset_mmio(vgpu, dmlr);
 568                 populate_pvinfo_page(vgpu);
 569 
 570                 if (dmlr) {
 571                         intel_vgpu_reset_display(vgpu);
 572                         intel_vgpu_reset_cfg_space(vgpu);
 573                         /* only reset the failsafe mode when dmlr reset */
 574                         vgpu->failsafe = false;
 575                         vgpu->pv_notified = false;
 576                 }
 577         }
 578 
 579         vgpu->resetting_eng = 0;
 580         gvt_dbg_core("reset vgpu%d done\n", vgpu->id);
 581         gvt_dbg_core("------------------------------------------\n");
 582 }
 583 
 584 /**
 585  * intel_gvt_reset_vgpu - reset a virtual GPU (Function Level)
 586  * @vgpu: virtual GPU
 587  *
 588  * This function is called when user wants to reset a virtual GPU.
 589  *
 590  */
 591 void intel_gvt_reset_vgpu(struct intel_vgpu *vgpu)
 592 {
 593         mutex_lock(&vgpu->vgpu_lock);
 594         intel_gvt_reset_vgpu_locked(vgpu, true, 0);
 595         mutex_unlock(&vgpu->vgpu_lock);
 596 }