drivers/gpu/drm/i915/gvt/gvt.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  *    Kevin Tian <kevin.tian@intel.com>
  25  *    Eddie Dong <eddie.dong@intel.com>
  26  *
  27  * Contributors:
  28  *    Niu Bing <bing.niu@intel.com>
  29  *    Zhi Wang <zhi.a.wang@intel.com>
  30  *
  31  */
  32
  33 #include <linux/types.h>
  34 #include <linux/kthread.h>
  35
  36 #include "i915_drv.h"
  37 #include "intel_gvt.h"
  38 #include "gvt.h"
  39 #include <linux/vfio.h>
  40 #include <linux/mdev.h>
  41
  42 struct intel_gvt_host intel_gvt_host;
  43
  44 static const char * const supported_hypervisors[] = {
  45         [INTEL_GVT_HYPERVISOR_XEN] = "XEN",
  46         [INTEL_GVT_HYPERVISOR_KVM] = "KVM",
  47 };
  48
  49 static struct intel_vgpu_type *
  50 intel_gvt_find_vgpu_type(struct intel_gvt *gvt, unsigned int type_group_id)
  51 {
  52         if (WARN_ON(type_group_id >= gvt->num_types))
  53                 return NULL;
  54         return &gvt->types[type_group_id];
  55 }
  56
  57 static ssize_t available_instances_show(struct mdev_type *mtype,
  58                                         struct mdev_type_attribute *attr,
  59                                         char *buf)
  60 {
  61         struct intel_vgpu_type *type;
  62         unsigned int num = 0;
  63         void *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
  64
  65         type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(mtype));
  66         if (!type)
  67                 num = 0;
  68         else
  69                 num = type->avail_instance;
  70
  71         return sprintf(buf, "%u\n", num);
  72 }
  73
  74 static ssize_t device_api_show(struct mdev_type *mtype,
  75                                struct mdev_type_attribute *attr, char *buf)
  76 {
  77         return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
  78 }
  79
  80 static ssize_t description_show(struct mdev_type *mtype,
  81                                 struct mdev_type_attribute *attr, char *buf)
  82 {
  83         struct intel_vgpu_type *type;
  84         void *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
  85
  86         type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(mtype));
  87         if (!type)
  88                 return 0;
  89
  90         return sprintf(buf, "low_gm_size: %dMB\nhigh_gm_size: %dMB\n"
  91                        "fence: %d\nresolution: %s\n"
  92                        "weight: %d\n",
  93                        BYTES_TO_MB(type->low_gm_size),
  94                        BYTES_TO_MB(type->high_gm_size),
  95                        type->fence, vgpu_edid_str(type->resolution),
  96                        type->weight);
  97 }
  98
  99 static MDEV_TYPE_ATTR_RO(available_instances);
 100 static MDEV_TYPE_ATTR_RO(device_api);
 101 static MDEV_TYPE_ATTR_RO(description);
 102
 103 static struct attribute *gvt_type_attrs[] = {
 104         &mdev_type_attr_available_instances.attr,
 105         &mdev_type_attr_device_api.attr,
 106         &mdev_type_attr_description.attr,
 107         NULL,
 108 };
 109
 110 static struct attribute_group *gvt_vgpu_type_groups[] = {
 111         [0 ... NR_MAX_INTEL_VGPU_TYPES - 1] = NULL,
 112 };
 113
 114 static bool intel_get_gvt_attrs(struct attribute_group ***intel_vgpu_type_groups)
 115 {
 116         *intel_vgpu_type_groups = gvt_vgpu_type_groups;
 117         return true;
 118 }
 119
 120 static int intel_gvt_init_vgpu_type_groups(struct intel_gvt *gvt)
 121 {
 122         int i, j;
 123         struct intel_vgpu_type *type;
 124         struct attribute_group *group;
 125
 126         for (i = 0; i < gvt->num_types; i++) {
 127                 type = &gvt->types[i];
 128
 129                 group = kzalloc(sizeof(struct attribute_group), GFP_KERNEL);
 130                 if (WARN_ON(!group))
 131                         goto unwind;
 132
 133                 group->name = type->name;
 134                 group->attrs = gvt_type_attrs;
 135                 gvt_vgpu_type_groups[i] = group;
 136         }
 137
 138         return 0;
 139
 140 unwind:
 141         for (j = 0; j < i; j++) {
 142                 group = gvt_vgpu_type_groups[j];
 143                 kfree(group);
 144         }
 145
 146         return -ENOMEM;
 147 }
 148
 149 static void intel_gvt_cleanup_vgpu_type_groups(struct intel_gvt *gvt)
 150 {
 151         int i;
 152         struct attribute_group *group;
 153
 154         for (i = 0; i < gvt->num_types; i++) {
 155                 group = gvt_vgpu_type_groups[i];
 156                 gvt_vgpu_type_groups[i] = NULL;
 157                 kfree(group);
 158         }
 159 }
 160
 161 static const struct intel_gvt_ops intel_gvt_ops = {
 162         .emulate_cfg_read = intel_vgpu_emulate_cfg_read,
 163         .emulate_cfg_write = intel_vgpu_emulate_cfg_write,
 164         .emulate_mmio_read = intel_vgpu_emulate_mmio_read,
 165         .emulate_mmio_write = intel_vgpu_emulate_mmio_write,
 166         .vgpu_create = intel_gvt_create_vgpu,
 167         .vgpu_destroy = intel_gvt_destroy_vgpu,
 168         .vgpu_release = intel_gvt_release_vgpu,
 169         .vgpu_reset = intel_gvt_reset_vgpu,
 170         .vgpu_activate = intel_gvt_activate_vgpu,
 171         .vgpu_deactivate = intel_gvt_deactivate_vgpu,
 172         .gvt_find_vgpu_type = intel_gvt_find_vgpu_type,
 173         .get_gvt_attrs = intel_get_gvt_attrs,
 174         .vgpu_query_plane = intel_vgpu_query_plane,
 175         .vgpu_get_dmabuf = intel_vgpu_get_dmabuf,
 176         .write_protect_handler = intel_vgpu_page_track_handler,
 177         .emulate_hotplug = intel_vgpu_emulate_hotplug,
 178 };
 179
 180 static void init_device_info(struct intel_gvt *gvt)
 181 {
 182         struct intel_gvt_device_info *info = &gvt->device_info;
 183         struct pci_dev *pdev = to_pci_dev(gvt->gt->i915->drm.dev);
 184
 185         info->max_support_vgpus = 8;
 186         info->cfg_space_size = PCI_CFG_SPACE_EXP_SIZE;
 187         info->mmio_size = 2 * 1024 * 1024;
 188         info->mmio_bar = 0;
 189         info->gtt_start_offset = 8 * 1024 * 1024;
 190         info->gtt_entry_size = 8;
 191         info->gtt_entry_size_shift = 3;
 192         info->gmadr_bytes_in_cmd = 8;
 193         info->max_surface_size = 36 * 1024 * 1024;
 194         info->msi_cap_offset = pdev->msi_cap;
 195 }
 196
 197 static void intel_gvt_test_and_emulate_vblank(struct intel_gvt *gvt)
 198 {
 199         struct intel_vgpu *vgpu;
 200         int id;
 201
 202         mutex_lock(&gvt->lock);
 203         idr_for_each_entry((&(gvt)->vgpu_idr), (vgpu), (id)) {
 204                 if (test_and_clear_bit(INTEL_GVT_REQUEST_EMULATE_VBLANK + id,
 205                                        (void *)&gvt->service_request)) {
 206                         if (vgpu->active)
 207                                 intel_vgpu_emulate_vblank(vgpu);
 208                 }
 209         }
 210         mutex_unlock(&gvt->lock);
 211 }
 212
 213 static int gvt_service_thread(void *data)
 214 {
 215         struct intel_gvt *gvt = (struct intel_gvt *)data;
 216         int ret;
 217
 218         gvt_dbg_core("service thread start\n");
 219
 220         while (!kthread_should_stop()) {
 221                 ret = wait_event_interruptible(gvt->service_thread_wq,
 222                                 kthread_should_stop() || gvt->service_request);
 223
 224                 if (kthread_should_stop())
 225                         break;
 226
 227                 if (WARN_ONCE(ret, "service thread is waken up by signal.\n"))
 228                         continue;
 229
 230                 intel_gvt_test_and_emulate_vblank(gvt);
 231
 232                 if (test_bit(INTEL_GVT_REQUEST_SCHED,
 233                                 (void *)&gvt->service_request) ||
 234                         test_bit(INTEL_GVT_REQUEST_EVENT_SCHED,
 235                                         (void *)&gvt->service_request)) {
 236                         intel_gvt_schedule(gvt);
 237                 }
 238         }
 239
 240         return 0;
 241 }
 242
 243 static void clean_service_thread(struct intel_gvt *gvt)
 244 {
 245         kthread_stop(gvt->service_thread);
 246 }
 247
 248 static int init_service_thread(struct intel_gvt *gvt)
 249 {
 250         init_waitqueue_head(&gvt->service_thread_wq);
 251
 252         gvt->service_thread = kthread_run(gvt_service_thread,
 253                         gvt, "gvt_service_thread");
 254         if (IS_ERR(gvt->service_thread)) {
 255                 gvt_err("fail to start service thread.\n");
 256                 return PTR_ERR(gvt->service_thread);
 257         }
 258         return 0;
 259 }
 260
 261 /**
 262  * intel_gvt_clean_device - clean a GVT device
 263  * @i915: i915 private
 264  *
 265  * This function is called at the driver unloading stage, to free the
 266  * resources owned by a GVT device.
 267  *
 268  */
 269 void intel_gvt_clean_device(struct drm_i915_private *i915)
 270 {
 271         struct intel_gvt *gvt = fetch_and_zero(&i915->gvt);
 272
 273         if (drm_WARN_ON(&i915->drm, !gvt))
 274                 return;
 275
 276         intel_gvt_destroy_idle_vgpu(gvt->idle_vgpu);
 277         intel_gvt_cleanup_vgpu_type_groups(gvt);
 278         intel_gvt_clean_vgpu_types(gvt);
 279
 280         intel_gvt_debugfs_clean(gvt);
 281         clean_service_thread(gvt);
 282         intel_gvt_clean_cmd_parser(gvt);
 283         intel_gvt_clean_sched_policy(gvt);
 284         intel_gvt_clean_workload_scheduler(gvt);
 285         intel_gvt_clean_gtt(gvt);
 286         intel_gvt_free_firmware(gvt);
 287         intel_gvt_clean_mmio_info(gvt);
 288         idr_destroy(&gvt->vgpu_idr);
 289
 290         kfree(i915->gvt);
 291 }
 292
 293 /**
 294  * intel_gvt_init_device - initialize a GVT device
 295  * @i915: drm i915 private data
 296  *
 297  * This function is called at the initialization stage, to initialize
 298  * necessary GVT components.
 299  *
 300  * Returns:
 301  * Zero on success, negative error code if failed.
 302  *
 303  */
 304 int intel_gvt_init_device(struct drm_i915_private *i915)
 305 {
 306         struct intel_gvt *gvt;
 307         struct intel_vgpu *vgpu;
 308         int ret;
 309
 310         if (drm_WARN_ON(&i915->drm, i915->gvt))
 311                 return -EEXIST;
 312
 313         gvt = kzalloc(sizeof(struct intel_gvt), GFP_KERNEL);
 314         if (!gvt)
 315                 return -ENOMEM;
 316
 317         gvt_dbg_core("init gvt device\n");
 318
 319         idr_init_base(&gvt->vgpu_idr, 1);
 320         spin_lock_init(&gvt->scheduler.mmio_context_lock);
 321         mutex_init(&gvt->lock);
 322         mutex_init(&gvt->sched_lock);
 323         gvt->gt = &i915->gt;
 324         i915->gvt = gvt;
 325
 326         init_device_info(gvt);
 327
 328         ret = intel_gvt_setup_mmio_info(gvt);
 329         if (ret)
 330                 goto out_clean_idr;
 331
 332         intel_gvt_init_engine_mmio_context(gvt);
 333
 334         ret = intel_gvt_load_firmware(gvt);
 335         if (ret)
 336                 goto out_clean_mmio_info;
 337
 338         ret = intel_gvt_init_irq(gvt);
 339         if (ret)
 340                 goto out_free_firmware;
 341
 342         ret = intel_gvt_init_gtt(gvt);
 343         if (ret)
 344                 goto out_free_firmware;
 345
 346         ret = intel_gvt_init_workload_scheduler(gvt);
 347         if (ret)
 348                 goto out_clean_gtt;
 349
 350         ret = intel_gvt_init_sched_policy(gvt);
 351         if (ret)
 352                 goto out_clean_workload_scheduler;
 353
 354         ret = intel_gvt_init_cmd_parser(gvt);
 355         if (ret)
 356                 goto out_clean_sched_policy;
 357
 358         ret = init_service_thread(gvt);
 359         if (ret)
 360                 goto out_clean_cmd_parser;
 361
 362         ret = intel_gvt_init_vgpu_types(gvt);
 363         if (ret)
 364                 goto out_clean_thread;
 365
 366         ret = intel_gvt_init_vgpu_type_groups(gvt);
 367         if (ret) {
 368                 gvt_err("failed to init vgpu type groups: %d\n", ret);
 369                 goto out_clean_types;
 370         }
 371
 372         vgpu = intel_gvt_create_idle_vgpu(gvt);
 373         if (IS_ERR(vgpu)) {
 374                 ret = PTR_ERR(vgpu);
 375                 gvt_err("failed to create idle vgpu\n");
 376                 goto out_clean_types;
 377         }
 378         gvt->idle_vgpu = vgpu;
 379
 380         intel_gvt_debugfs_init(gvt);
 381
 382         gvt_dbg_core("gvt device initialization is done\n");
 383         intel_gvt_host.dev = i915->drm.dev;
 384         intel_gvt_host.initialized = true;
 385         return 0;
 386
 387 out_clean_types:
 388         intel_gvt_clean_vgpu_types(gvt);
 389 out_clean_thread:
 390         clean_service_thread(gvt);
 391 out_clean_cmd_parser:
 392         intel_gvt_clean_cmd_parser(gvt);
 393 out_clean_sched_policy:
 394         intel_gvt_clean_sched_policy(gvt);
 395 out_clean_workload_scheduler:
 396         intel_gvt_clean_workload_scheduler(gvt);
 397 out_clean_gtt:
 398         intel_gvt_clean_gtt(gvt);
 399 out_free_firmware:
 400         intel_gvt_free_firmware(gvt);
 401 out_clean_mmio_info:
 402         intel_gvt_clean_mmio_info(gvt);
 403 out_clean_idr:
 404         idr_destroy(&gvt->vgpu_idr);
 405         kfree(gvt);
 406         i915->gvt = NULL;
 407         return ret;
 408 }
 409
 410 int
 411 intel_gvt_pm_resume(struct intel_gvt *gvt)
 412 {
 413         intel_gvt_restore_fence(gvt);
 414         intel_gvt_restore_mmio(gvt);
 415         intel_gvt_restore_ggtt(gvt);
 416         return 0;
 417 }
 418
 419 int
 420 intel_gvt_register_hypervisor(const struct intel_gvt_mpt *m)
 421 {
 422         int ret;
 423         void *gvt;
 424
 425         if (!intel_gvt_host.initialized)
 426                 return -ENODEV;
 427
 428         if (m->type != INTEL_GVT_HYPERVISOR_KVM &&
 429             m->type != INTEL_GVT_HYPERVISOR_XEN)
 430                 return -EINVAL;
 431
 432         /* Get a reference for device model module */
 433         if (!try_module_get(THIS_MODULE))
 434                 return -ENODEV;
 435
 436         intel_gvt_host.mpt = m;
 437         intel_gvt_host.hypervisor_type = m->type;
 438         gvt = (void *)kdev_to_i915(intel_gvt_host.dev)->gvt;
 439
 440         ret = intel_gvt_hypervisor_host_init(intel_gvt_host.dev, gvt,
 441                                              &intel_gvt_ops);
 442         if (ret < 0) {
 443                 gvt_err("Failed to init %s hypervisor module\n",
 444                         supported_hypervisors[intel_gvt_host.hypervisor_type]);
 445                 module_put(THIS_MODULE);
 446                 return -ENODEV;
 447         }
 448         gvt_dbg_core("Running with hypervisor %s in host mode\n",
 449                      supported_hypervisors[intel_gvt_host.hypervisor_type]);
 450         return 0;
 451 }
 452 EXPORT_SYMBOL_GPL(intel_gvt_register_hypervisor);
 453
 454 void
 455 intel_gvt_unregister_hypervisor(void)
 456 {
 457         intel_gvt_hypervisor_host_exit(intel_gvt_host.dev);
 458         module_put(THIS_MODULE);
 459 }
 460 EXPORT_SYMBOL_GPL(intel_gvt_unregister_hypervisor);