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 *intel_gvt_find_vgpu_type(struct intel_gvt *gvt,
  50                 const char *name)
  51 {
  52         const char *driver_name =
  53                 dev_driver_string(gvt->gt->i915->drm.dev);
  54         int i;
  55
  56         name += strlen(driver_name) + 1;
  57         for (i = 0; i < gvt->num_types; i++) {
  58                 struct intel_vgpu_type *t = &gvt->types[i];
  59
  60                 if (!strncmp(t->name, name, sizeof(t->name)))
  61                         return t;
  62         }
  63
  64         return NULL;
  65 }
  66
  67 static ssize_t available_instances_show(struct kobject *kobj,
  68                                         struct device *dev, char *buf)
  69 {
  70         struct intel_vgpu_type *type;
  71         unsigned int num = 0;
  72         void *gvt = kdev_to_i915(dev)->gvt;
  73
  74         type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
  75         if (!type)
  76                 num = 0;
  77         else
  78                 num = type->avail_instance;
  79
  80         return sprintf(buf, "%u\n", num);
  81 }
  82
  83 static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
  84                 char *buf)
  85 {
  86         return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
  87 }
  88
  89 static ssize_t description_show(struct kobject *kobj, struct device *dev,
  90                 char *buf)
  91 {
  92         struct intel_vgpu_type *type;
  93         void *gvt = kdev_to_i915(dev)->gvt;
  94
  95         type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
  96         if (!type)
  97                 return 0;
  98
  99         return sprintf(buf, "low_gm_size: %dMB\nhigh_gm_size: %dMB\n"
 100                        "fence: %d\nresolution: %s\n"
 101                        "weight: %d\n",
 102                        BYTES_TO_MB(type->low_gm_size),
 103                        BYTES_TO_MB(type->high_gm_size),
 104                        type->fence, vgpu_edid_str(type->resolution),
 105                        type->weight);
 106 }
 107
 108 static MDEV_TYPE_ATTR_RO(available_instances);
 109 static MDEV_TYPE_ATTR_RO(device_api);
 110 static MDEV_TYPE_ATTR_RO(description);
 111
 112 static struct attribute *gvt_type_attrs[] = {
 113         &mdev_type_attr_available_instances.attr,
 114         &mdev_type_attr_device_api.attr,
 115         &mdev_type_attr_description.attr,
 116         NULL,
 117 };
 118
 119 static struct attribute_group *gvt_vgpu_type_groups[] = {
 120         [0 ... NR_MAX_INTEL_VGPU_TYPES - 1] = NULL,
 121 };
 122
 123 static bool intel_get_gvt_attrs(struct attribute_group ***intel_vgpu_type_groups)
 124 {
 125         *intel_vgpu_type_groups = gvt_vgpu_type_groups;
 126         return true;
 127 }
 128
 129 static bool intel_gvt_init_vgpu_type_groups(struct intel_gvt *gvt)
 130 {
 131         int i, j;
 132         struct intel_vgpu_type *type;
 133         struct attribute_group *group;
 134
 135         for (i = 0; i < gvt->num_types; i++) {
 136                 type = &gvt->types[i];
 137
 138                 group = kzalloc(sizeof(struct attribute_group), GFP_KERNEL);
 139                 if (WARN_ON(!group))
 140                         goto unwind;
 141
 142                 group->name = type->name;
 143                 group->attrs = gvt_type_attrs;
 144                 gvt_vgpu_type_groups[i] = group;
 145         }
 146
 147         return true;
 148
 149 unwind:
 150         for (j = 0; j < i; j++) {
 151                 group = gvt_vgpu_type_groups[j];
 152                 kfree(group);
 153         }
 154
 155         return false;
 156 }
 157
 158 static void intel_gvt_cleanup_vgpu_type_groups(struct intel_gvt *gvt)
 159 {
 160         int i;
 161         struct attribute_group *group;
 162
 163         for (i = 0; i < gvt->num_types; i++) {
 164                 group = gvt_vgpu_type_groups[i];
 165                 gvt_vgpu_type_groups[i] = NULL;
 166                 kfree(group);
 167         }
 168 }
 169
 170 static const struct intel_gvt_ops intel_gvt_ops = {
 171         .emulate_cfg_read = intel_vgpu_emulate_cfg_read,
 172         .emulate_cfg_write = intel_vgpu_emulate_cfg_write,
 173         .emulate_mmio_read = intel_vgpu_emulate_mmio_read,
 174         .emulate_mmio_write = intel_vgpu_emulate_mmio_write,
 175         .vgpu_create = intel_gvt_create_vgpu,
 176         .vgpu_destroy = intel_gvt_destroy_vgpu,
 177         .vgpu_release = intel_gvt_release_vgpu,
 178         .vgpu_reset = intel_gvt_reset_vgpu,
 179         .vgpu_activate = intel_gvt_activate_vgpu,
 180         .vgpu_deactivate = intel_gvt_deactivate_vgpu,
 181         .gvt_find_vgpu_type = intel_gvt_find_vgpu_type,
 182         .get_gvt_attrs = intel_get_gvt_attrs,
 183         .vgpu_query_plane = intel_vgpu_query_plane,
 184         .vgpu_get_dmabuf = intel_vgpu_get_dmabuf,
 185         .write_protect_handler = intel_vgpu_page_track_handler,
 186         .emulate_hotplug = intel_vgpu_emulate_hotplug,
 187 };
 188
 189 static void init_device_info(struct intel_gvt *gvt)
 190 {
 191         struct intel_gvt_device_info *info = &gvt->device_info;
 192         struct pci_dev *pdev = to_pci_dev(gvt->gt->i915->drm.dev);
 193
 194         info->max_support_vgpus = 8;
 195         info->cfg_space_size = PCI_CFG_SPACE_EXP_SIZE;
 196         info->mmio_size = 2 * 1024 * 1024;
 197         info->mmio_bar = 0;
 198         info->gtt_start_offset = 8 * 1024 * 1024;
 199         info->gtt_entry_size = 8;
 200         info->gtt_entry_size_shift = 3;
 201         info->gmadr_bytes_in_cmd = 8;
 202         info->max_surface_size = 36 * 1024 * 1024;
 203         info->msi_cap_offset = pdev->msi_cap;
 204 }
 205
 206 static void intel_gvt_test_and_emulate_vblank(struct intel_gvt *gvt)
 207 {
 208         struct intel_vgpu *vgpu;
 209         int id;
 210
 211         mutex_lock(&gvt->lock);
 212         idr_for_each_entry((&(gvt)->vgpu_idr), (vgpu), (id)) {
 213                 if (test_and_clear_bit(INTEL_GVT_REQUEST_EMULATE_VBLANK + id,
 214                                        (void *)&gvt->service_request)) {
 215                         if (vgpu->active)
 216                                 intel_vgpu_emulate_vblank(vgpu);
 217                 }
 218         }
 219         mutex_unlock(&gvt->lock);
 220 }
 221
 222 static int gvt_service_thread(void *data)
 223 {
 224         struct intel_gvt *gvt = (struct intel_gvt *)data;
 225         int ret;
 226
 227         gvt_dbg_core("service thread start\n");
 228
 229         while (!kthread_should_stop()) {
 230                 ret = wait_event_interruptible(gvt->service_thread_wq,
 231                                 kthread_should_stop() || gvt->service_request);
 232
 233                 if (kthread_should_stop())
 234                         break;
 235
 236                 if (WARN_ONCE(ret, "service thread is waken up by signal.\n"))
 237                         continue;
 238
 239                 intel_gvt_test_and_emulate_vblank(gvt);
 240
 241                 if (test_bit(INTEL_GVT_REQUEST_SCHED,
 242                                 (void *)&gvt->service_request) ||
 243                         test_bit(INTEL_GVT_REQUEST_EVENT_SCHED,
 244                                         (void *)&gvt->service_request)) {
 245                         intel_gvt_schedule(gvt);
 246                 }
 247         }
 248
 249         return 0;
 250 }
 251
 252 static void clean_service_thread(struct intel_gvt *gvt)
 253 {
 254         kthread_stop(gvt->service_thread);
 255 }
 256
 257 static int init_service_thread(struct intel_gvt *gvt)
 258 {
 259         init_waitqueue_head(&gvt->service_thread_wq);
 260
 261         gvt->service_thread = kthread_run(gvt_service_thread,
 262                         gvt, "gvt_service_thread");
 263         if (IS_ERR(gvt->service_thread)) {
 264                 gvt_err("fail to start service thread.\n");
 265                 return PTR_ERR(gvt->service_thread);
 266         }
 267         return 0;
 268 }
 269
 270 /**
 271  * intel_gvt_clean_device - clean a GVT device
 272  * @i915: i915 private
 273  *
 274  * This function is called at the driver unloading stage, to free the
 275  * resources owned by a GVT device.
 276  *
 277  */
 278 void intel_gvt_clean_device(struct drm_i915_private *i915)
 279 {
 280         struct intel_gvt *gvt = fetch_and_zero(&i915->gvt);
 281
 282         if (drm_WARN_ON(&i915->drm, !gvt))
 283                 return;
 284
 285         intel_gvt_destroy_idle_vgpu(gvt->idle_vgpu);
 286         intel_gvt_cleanup_vgpu_type_groups(gvt);
 287         intel_gvt_clean_vgpu_types(gvt);
 288
 289         intel_gvt_debugfs_clean(gvt);
 290         clean_service_thread(gvt);
 291         intel_gvt_clean_cmd_parser(gvt);
 292         intel_gvt_clean_sched_policy(gvt);
 293         intel_gvt_clean_workload_scheduler(gvt);
 294         intel_gvt_clean_gtt(gvt);
 295         intel_gvt_free_firmware(gvt);
 296         intel_gvt_clean_mmio_info(gvt);
 297         idr_destroy(&gvt->vgpu_idr);
 298
 299         kfree(i915->gvt);
 300 }
 301
 302 /**
 303  * intel_gvt_init_device - initialize a GVT device
 304  * @i915: drm i915 private data
 305  *
 306  * This function is called at the initialization stage, to initialize
 307  * necessary GVT components.
 308  *
 309  * Returns:
 310  * Zero on success, negative error code if failed.
 311  *
 312  */
 313 int intel_gvt_init_device(struct drm_i915_private *i915)
 314 {
 315         struct intel_gvt *gvt;
 316         struct intel_vgpu *vgpu;
 317         int ret;
 318
 319         if (drm_WARN_ON(&i915->drm, i915->gvt))
 320                 return -EEXIST;
 321
 322         gvt = kzalloc(sizeof(struct intel_gvt), GFP_KERNEL);
 323         if (!gvt)
 324                 return -ENOMEM;
 325
 326         gvt_dbg_core("init gvt device\n");
 327
 328         idr_init_base(&gvt->vgpu_idr, 1);
 329         spin_lock_init(&gvt->scheduler.mmio_context_lock);
 330         mutex_init(&gvt->lock);
 331         mutex_init(&gvt->sched_lock);
 332         gvt->gt = &i915->gt;
 333         i915->gvt = gvt;
 334
 335         init_device_info(gvt);
 336
 337         ret = intel_gvt_setup_mmio_info(gvt);
 338         if (ret)
 339                 goto out_clean_idr;
 340
 341         intel_gvt_init_engine_mmio_context(gvt);
 342
 343         ret = intel_gvt_load_firmware(gvt);
 344         if (ret)
 345                 goto out_clean_mmio_info;
 346
 347         ret = intel_gvt_init_irq(gvt);
 348         if (ret)
 349                 goto out_free_firmware;
 350
 351         ret = intel_gvt_init_gtt(gvt);
 352         if (ret)
 353                 goto out_free_firmware;
 354
 355         ret = intel_gvt_init_workload_scheduler(gvt);
 356         if (ret)
 357                 goto out_clean_gtt;
 358
 359         ret = intel_gvt_init_sched_policy(gvt);
 360         if (ret)
 361                 goto out_clean_workload_scheduler;
 362
 363         ret = intel_gvt_init_cmd_parser(gvt);
 364         if (ret)
 365                 goto out_clean_sched_policy;
 366
 367         ret = init_service_thread(gvt);
 368         if (ret)
 369                 goto out_clean_cmd_parser;
 370
 371         ret = intel_gvt_init_vgpu_types(gvt);
 372         if (ret)
 373                 goto out_clean_thread;
 374
 375         ret = intel_gvt_init_vgpu_type_groups(gvt);
 376         if (ret == false) {
 377                 gvt_err("failed to init vgpu type groups: %d\n", ret);
 378                 goto out_clean_types;
 379         }
 380
 381         vgpu = intel_gvt_create_idle_vgpu(gvt);
 382         if (IS_ERR(vgpu)) {
 383                 ret = PTR_ERR(vgpu);
 384                 gvt_err("failed to create idle vgpu\n");
 385                 goto out_clean_types;
 386         }
 387         gvt->idle_vgpu = vgpu;
 388
 389         intel_gvt_debugfs_init(gvt);
 390
 391         gvt_dbg_core("gvt device initialization is done\n");
 392         intel_gvt_host.dev = i915->drm.dev;
 393         intel_gvt_host.initialized = true;
 394         return 0;
 395
 396 out_clean_types:
 397         intel_gvt_clean_vgpu_types(gvt);
 398 out_clean_thread:
 399         clean_service_thread(gvt);
 400 out_clean_cmd_parser:
 401         intel_gvt_clean_cmd_parser(gvt);
 402 out_clean_sched_policy:
 403         intel_gvt_clean_sched_policy(gvt);
 404 out_clean_workload_scheduler:
 405         intel_gvt_clean_workload_scheduler(gvt);
 406 out_clean_gtt:
 407         intel_gvt_clean_gtt(gvt);
 408 out_free_firmware:
 409         intel_gvt_free_firmware(gvt);
 410 out_clean_mmio_info:
 411         intel_gvt_clean_mmio_info(gvt);
 412 out_clean_idr:
 413         idr_destroy(&gvt->vgpu_idr);
 414         kfree(gvt);
 415         i915->gvt = NULL;
 416         return ret;
 417 }
 418
 419 int
 420 intel_gvt_pm_resume(struct intel_gvt *gvt)
 421 {
 422         intel_gvt_restore_fence(gvt);
 423         intel_gvt_restore_mmio(gvt);
 424         intel_gvt_restore_ggtt(gvt);
 425         return 0;
 426 }
 427
 428 int
 429 intel_gvt_register_hypervisor(const struct intel_gvt_mpt *m)
 430 {
 431         int ret;
 432         void *gvt;
 433
 434         if (!intel_gvt_host.initialized)
 435                 return -ENODEV;
 436
 437         if (m->type != INTEL_GVT_HYPERVISOR_KVM &&
 438             m->type != INTEL_GVT_HYPERVISOR_XEN)
 439                 return -EINVAL;
 440
 441         /* Get a reference for device model module */
 442         if (!try_module_get(THIS_MODULE))
 443                 return -ENODEV;
 444
 445         intel_gvt_host.mpt = m;
 446         intel_gvt_host.hypervisor_type = m->type;
 447         gvt = (void *)kdev_to_i915(intel_gvt_host.dev)->gvt;
 448
 449         ret = intel_gvt_hypervisor_host_init(intel_gvt_host.dev, gvt,
 450                                              &intel_gvt_ops);
 451         if (ret < 0) {
 452                 gvt_err("Failed to init %s hypervisor module\n",
 453                         supported_hypervisors[intel_gvt_host.hypervisor_type]);
 454                 module_put(THIS_MODULE);
 455                 return -ENODEV;
 456         }
 457         gvt_dbg_core("Running with hypervisor %s in host mode\n",
 458                      supported_hypervisors[intel_gvt_host.hypervisor_type]);
 459         return 0;
 460 }
 461 EXPORT_SYMBOL_GPL(intel_gvt_register_hypervisor);
 462
 463 void
 464 intel_gvt_unregister_hypervisor(void)
 465 {
 466         intel_gvt_hypervisor_host_exit(intel_gvt_host.dev);
 467         module_put(THIS_MODULE);
 468 }
 469 EXPORT_SYMBOL_GPL(intel_gvt_unregister_hypervisor);