drivers/gpu/drm/i915/gvt/vgpu.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  *    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(vgpu, vgtif_reg(magic)) = VGT_MAGIC;
  42         vgpu_vreg(vgpu, vgtif_reg(version_major)) = 1;
  43         vgpu_vreg(vgpu, vgtif_reg(version_minor)) = 0;
  44         vgpu_vreg(vgpu, vgtif_reg(display_ready)) = 0;
  45         vgpu_vreg(vgpu, vgtif_reg(vgt_id)) = vgpu->id;
  46         vgpu_vreg(vgpu, vgtif_reg(avail_rs.mappable_gmadr.base)) =
  47                 vgpu_aperture_gmadr_base(vgpu);
  48         vgpu_vreg(vgpu, vgtif_reg(avail_rs.mappable_gmadr.size)) =
  49                 vgpu_aperture_sz(vgpu);
  50         vgpu_vreg(vgpu, vgtif_reg(avail_rs.nonmappable_gmadr.base)) =
  51                 vgpu_hidden_gmadr_base(vgpu);
  52         vgpu_vreg(vgpu, vgtif_reg(avail_rs.nonmappable_gmadr.size)) =
  53                 vgpu_hidden_sz(vgpu);
  54
  55         vgpu_vreg(vgpu, vgtif_reg(avail_rs.fence_num)) = vgpu_fence_sz(vgpu);
  56
  57         gvt_dbg_core("Populate PVINFO PAGE for vGPU %d\n", vgpu->id);
  58         gvt_dbg_core("aperture base [GMADR] 0x%llx size 0x%llx\n",
  59                 vgpu_aperture_gmadr_base(vgpu), vgpu_aperture_sz(vgpu));
  60         gvt_dbg_core("hidden base [GMADR] 0x%llx size=0x%llx\n",
  61                 vgpu_hidden_gmadr_base(vgpu), vgpu_hidden_sz(vgpu));
  62         gvt_dbg_core("fence size %d\n", vgpu_fence_sz(vgpu));
  63
  64         WARN_ON(sizeof(struct vgt_if) != VGT_PVINFO_SIZE);
  65 }
  66
  67 /**
  68  * intel_gvt_init_vgpu_types - initialize vGPU type list
  69  * @gvt : GVT device
  70  *
  71  * Initialize vGPU type list based on available resource.
  72  *
  73  */
  74 int intel_gvt_init_vgpu_types(struct intel_gvt *gvt)
  75 {
  76         unsigned int num_types;
  77         unsigned int i, low_avail;
  78         unsigned int min_low;
  79
  80         /* vGPU type name is defined as GVTg_Vx_y which contains
  81          * physical GPU generation type and 'y' means maximum vGPU
  82          * instances user can create on one physical GPU for this
  83          * type.
  84          *
  85          * Depend on physical SKU resource, might see vGPU types like
  86          * GVTg_V4_8, GVTg_V4_4, GVTg_V4_2, etc. We can create
  87          * different types of vGPU on same physical GPU depending on
  88          * available resource. Each vGPU type will have "avail_instance"
  89          * to indicate how many vGPU instance can be created for this
  90          * type.
  91          *
  92          * Currently use static size here as we init type earlier..
  93          */
  94         low_avail = MB_TO_BYTES(256) - HOST_LOW_GM_SIZE;
  95         num_types = 4;
  96
  97         gvt->types = kzalloc(num_types * sizeof(struct intel_vgpu_type),
  98                              GFP_KERNEL);
  99         if (!gvt->types)
 100                 return -ENOMEM;
 101
 102         min_low = MB_TO_BYTES(32);
 103         for (i = 0; i < num_types; ++i) {
 104                 if (low_avail / min_low == 0)
 105                         break;
 106                 gvt->types[i].low_gm_size = min_low;
 107                 gvt->types[i].high_gm_size = max((min_low<<3), MB_TO_BYTES(384U));
 108                 gvt->types[i].fence = 4;
 109                 gvt->types[i].max_instance = low_avail / min_low;
 110                 gvt->types[i].avail_instance = gvt->types[i].max_instance;
 111
 112                 if (IS_GEN8(gvt->dev_priv))
 113                         sprintf(gvt->types[i].name, "GVTg_V4_%u",
 114                                                 gvt->types[i].max_instance);
 115                 else if (IS_GEN9(gvt->dev_priv))
 116                         sprintf(gvt->types[i].name, "GVTg_V5_%u",
 117                                                 gvt->types[i].max_instance);
 118
 119                 min_low <<= 1;
 120                 gvt_dbg_core("type[%d]: %s max %u avail %u low %u high %u fence %u\n",
 121                              i, gvt->types[i].name, gvt->types[i].max_instance,
 122                              gvt->types[i].avail_instance,
 123                              gvt->types[i].low_gm_size,
 124                              gvt->types[i].high_gm_size, gvt->types[i].fence);
 125         }
 126
 127         gvt->num_types = i;
 128         return 0;
 129 }
 130
 131 void intel_gvt_clean_vgpu_types(struct intel_gvt *gvt)
 132 {
 133         kfree(gvt->types);
 134 }
 135
 136 static void intel_gvt_update_vgpu_types(struct intel_gvt *gvt)
 137 {
 138         int i;
 139         unsigned int low_gm_avail, high_gm_avail, fence_avail;
 140         unsigned int low_gm_min, high_gm_min, fence_min, total_min;
 141
 142         /* Need to depend on maxium hw resource size but keep on
 143          * static config for now.
 144          */
 145         low_gm_avail = MB_TO_BYTES(256) - HOST_LOW_GM_SIZE -
 146                 gvt->gm.vgpu_allocated_low_gm_size;
 147         high_gm_avail = MB_TO_BYTES(256) * 8UL - HOST_HIGH_GM_SIZE -
 148                 gvt->gm.vgpu_allocated_high_gm_size;
 149         fence_avail = gvt_fence_sz(gvt) - HOST_FENCE -
 150                 gvt->fence.vgpu_allocated_fence_num;
 151
 152         for (i = 0; i < gvt->num_types; i++) {
 153                 low_gm_min = low_gm_avail / gvt->types[i].low_gm_size;
 154                 high_gm_min = high_gm_avail / gvt->types[i].high_gm_size;
 155                 fence_min = fence_avail / gvt->types[i].fence;
 156                 total_min = min(min(low_gm_min, high_gm_min), fence_min);
 157                 gvt->types[i].avail_instance = min(gvt->types[i].max_instance,
 158                                                    total_min);
 159
 160                 gvt_dbg_core("update type[%d]: %s max %u avail %u low %u high %u fence %u\n",
 161                        i, gvt->types[i].name, gvt->types[i].max_instance,
 162                        gvt->types[i].avail_instance, gvt->types[i].low_gm_size,
 163                        gvt->types[i].high_gm_size, gvt->types[i].fence);
 164         }
 165 }
 166
 167 /**
 168  * intel_gvt_destroy_vgpu - destroy a virtual GPU
 169  * @vgpu: virtual GPU
 170  *
 171  * This function is called when user wants to destroy a virtual GPU.
 172  *
 173  */
 174 void intel_gvt_destroy_vgpu(struct intel_vgpu *vgpu)
 175 {
 176         struct intel_gvt *gvt = vgpu->gvt;
 177
 178         mutex_lock(&gvt->lock);
 179
 180         vgpu->active = false;
 181         idr_remove(&gvt->vgpu_idr, vgpu->id);
 182
 183         if (atomic_read(&vgpu->running_workload_num)) {
 184                 mutex_unlock(&gvt->lock);
 185                 intel_gvt_wait_vgpu_idle(vgpu);
 186                 mutex_lock(&gvt->lock);
 187         }
 188
 189         intel_vgpu_stop_schedule(vgpu);
 190         intel_vgpu_clean_sched_policy(vgpu);
 191         intel_vgpu_clean_gvt_context(vgpu);
 192         intel_vgpu_clean_execlist(vgpu);
 193         intel_vgpu_clean_display(vgpu);
 194         intel_vgpu_clean_opregion(vgpu);
 195         intel_vgpu_clean_gtt(vgpu);
 196         intel_gvt_hypervisor_detach_vgpu(vgpu);
 197         intel_vgpu_free_resource(vgpu);
 198         intel_vgpu_clean_mmio(vgpu);
 199         vfree(vgpu);
 200
 201         intel_gvt_update_vgpu_types(gvt);
 202         mutex_unlock(&gvt->lock);
 203 }
 204
 205 static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt,
 206                 struct intel_vgpu_creation_params *param)
 207 {
 208         struct intel_vgpu *vgpu;
 209         int ret;
 210
 211         gvt_dbg_core("handle %llu low %llu MB high %llu MB fence %llu\n",
 212                         param->handle, param->low_gm_sz, param->high_gm_sz,
 213                         param->fence_sz);
 214
 215         vgpu = vzalloc(sizeof(*vgpu));
 216         if (!vgpu)
 217                 return ERR_PTR(-ENOMEM);
 218
 219         mutex_lock(&gvt->lock);
 220
 221         ret = idr_alloc(&gvt->vgpu_idr, vgpu, 1, GVT_MAX_VGPU, GFP_KERNEL);
 222         if (ret < 0)
 223                 goto out_free_vgpu;
 224
 225         vgpu->id = ret;
 226         vgpu->handle = param->handle;
 227         vgpu->gvt = gvt;
 228         bitmap_zero(vgpu->tlb_handle_pending, I915_NUM_ENGINES);
 229
 230         intel_vgpu_init_cfg_space(vgpu, param->primary);
 231
 232         ret = intel_vgpu_init_mmio(vgpu);
 233         if (ret)
 234                 goto out_clean_idr;
 235
 236         ret = intel_vgpu_alloc_resource(vgpu, param);
 237         if (ret)
 238                 goto out_clean_vgpu_mmio;
 239
 240         populate_pvinfo_page(vgpu);
 241
 242         ret = intel_gvt_hypervisor_attach_vgpu(vgpu);
 243         if (ret)
 244                 goto out_clean_vgpu_resource;
 245
 246         ret = intel_vgpu_init_gtt(vgpu);
 247         if (ret)
 248                 goto out_detach_hypervisor_vgpu;
 249
 250         ret = intel_vgpu_init_display(vgpu);
 251         if (ret)
 252                 goto out_clean_gtt;
 253
 254         ret = intel_vgpu_init_execlist(vgpu);
 255         if (ret)
 256                 goto out_clean_display;
 257
 258         ret = intel_vgpu_init_gvt_context(vgpu);
 259         if (ret)
 260                 goto out_clean_execlist;
 261
 262         ret = intel_vgpu_init_sched_policy(vgpu);
 263         if (ret)
 264                 goto out_clean_shadow_ctx;
 265
 266         vgpu->active = true;
 267         mutex_unlock(&gvt->lock);
 268
 269         return vgpu;
 270
 271 out_clean_shadow_ctx:
 272         intel_vgpu_clean_gvt_context(vgpu);
 273 out_clean_execlist:
 274         intel_vgpu_clean_execlist(vgpu);
 275 out_clean_display:
 276         intel_vgpu_clean_display(vgpu);
 277 out_clean_gtt:
 278         intel_vgpu_clean_gtt(vgpu);
 279 out_detach_hypervisor_vgpu:
 280         intel_gvt_hypervisor_detach_vgpu(vgpu);
 281 out_clean_vgpu_resource:
 282         intel_vgpu_free_resource(vgpu);
 283 out_clean_vgpu_mmio:
 284         intel_vgpu_clean_mmio(vgpu);
 285 out_clean_idr:
 286         idr_remove(&gvt->vgpu_idr, vgpu->id);
 287 out_free_vgpu:
 288         vfree(vgpu);
 289         mutex_unlock(&gvt->lock);
 290         return ERR_PTR(ret);
 291 }
 292
 293 /**
 294  * intel_gvt_create_vgpu - create a virtual GPU
 295  * @gvt: GVT device
 296  * @type: type of the vGPU to create
 297  *
 298  * This function is called when user wants to create a virtual GPU.
 299  *
 300  * Returns:
 301  * pointer to intel_vgpu, error pointer if failed.
 302  */
 303 struct intel_vgpu *intel_gvt_create_vgpu(struct intel_gvt *gvt,
 304                                 struct intel_vgpu_type *type)
 305 {
 306         struct intel_vgpu_creation_params param;
 307         struct intel_vgpu *vgpu;
 308
 309         param.handle = 0;
 310         param.primary = 1;
 311         param.low_gm_sz = type->low_gm_size;
 312         param.high_gm_sz = type->high_gm_size;
 313         param.fence_sz = type->fence;
 314
 315         /* XXX current param based on MB */
 316         param.low_gm_sz = BYTES_TO_MB(param.low_gm_sz);
 317         param.high_gm_sz = BYTES_TO_MB(param.high_gm_sz);
 318
 319         vgpu = __intel_gvt_create_vgpu(gvt, &param);
 320         if (IS_ERR(vgpu))
 321                 return vgpu;
 322
 323         /* calculate left instance change for types */
 324         intel_gvt_update_vgpu_types(gvt);
 325
 326         return vgpu;
 327 }
 328
 329 /**
 330  * intel_gvt_reset_vgpu_locked - reset a virtual GPU by DMLR or GT reset
 331  * @vgpu: virtual GPU
 332  * @dmlr: vGPU Device Model Level Reset or GT Reset
 333  * @engine_mask: engines to reset for GT reset
 334  *
 335  * This function is called when user wants to reset a virtual GPU through
 336  * device model reset or GT reset. The caller should hold the gvt lock.
 337  *
 338  * vGPU Device Model Level Reset (DMLR) simulates the PCI level reset to reset
 339  * the whole vGPU to default state as when it is created. This vGPU function
 340  * is required both for functionary and security concerns.The ultimate goal
 341  * of vGPU FLR is that reuse a vGPU instance by virtual machines. When we
 342  * assign a vGPU to a virtual machine we must isse such reset first.
 343  *
 344  * Full GT Reset and Per-Engine GT Reset are soft reset flow for GPU engines
 345  * (Render, Blitter, Video, Video Enhancement). It is defined by GPU Spec.
 346  * Unlike the FLR, GT reset only reset particular resource of a vGPU per
 347  * the reset request. Guest driver can issue a GT reset by programming the
 348  * virtual GDRST register to reset specific virtual GPU engine or all
 349  * engines.
 350  *
 351  * The parameter dev_level is to identify if we will do DMLR or GT reset.
 352  * The parameter engine_mask is to specific the engines that need to be
 353  * resetted. If value ALL_ENGINES is given for engine_mask, it means
 354  * the caller requests a full GT reset that we will reset all virtual
 355  * GPU engines. For FLR, engine_mask is ignored.
 356  */
 357 void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
 358                                  unsigned int engine_mask)
 359 {
 360         struct intel_gvt *gvt = vgpu->gvt;
 361         struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
 362
 363         gvt_dbg_core("------------------------------------------\n");
 364         gvt_dbg_core("resseting vgpu%d, dmlr %d, engine_mask %08x\n",
 365                      vgpu->id, dmlr, engine_mask);
 366         vgpu->resetting = true;
 367
 368         intel_vgpu_stop_schedule(vgpu);
 369         /*
 370          * The current_vgpu will set to NULL after stopping the
 371          * scheduler when the reset is triggered by current vgpu.
 372          */
 373         if (scheduler->current_vgpu == NULL) {
 374                 mutex_unlock(&gvt->lock);
 375                 intel_gvt_wait_vgpu_idle(vgpu);
 376                 mutex_lock(&gvt->lock);
 377         }
 378
 379         intel_vgpu_reset_execlist(vgpu, dmlr ? ALL_ENGINES : engine_mask);
 380
 381         /* full GPU reset or device model level reset */
 382         if (engine_mask == ALL_ENGINES || dmlr) {
 383                 intel_vgpu_reset_gtt(vgpu, dmlr);
 384                 intel_vgpu_reset_resource(vgpu);
 385                 intel_vgpu_reset_mmio(vgpu);
 386                 populate_pvinfo_page(vgpu);
 387
 388                 if (dmlr)
 389                         intel_vgpu_reset_cfg_space(vgpu);
 390         }
 391
 392         vgpu->resetting = false;
 393         gvt_dbg_core("reset vgpu%d done\n", vgpu->id);
 394         gvt_dbg_core("------------------------------------------\n");
 395 }
 396
 397 /**
 398  * intel_gvt_reset_vgpu - reset a virtual GPU (Function Level)
 399  * @vgpu: virtual GPU
 400  *
 401  * This function is called when user wants to reset a virtual GPU.
 402  *
 403  */
 404 void intel_gvt_reset_vgpu(struct intel_vgpu *vgpu)
 405 {
 406         mutex_lock(&vgpu->gvt->lock);
 407         intel_gvt_reset_vgpu_locked(vgpu, true, 0);
 408         mutex_unlock(&vgpu->gvt->lock);
 409 }