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 <xen/xen.h>
  35 #include <linux/kthread.h>
  36
  37 #include "i915_drv.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         int i;
  53         struct intel_vgpu_type *t;
  54         const char *driver_name = dev_driver_string(
  55                         &gvt->dev_priv->drm.pdev->dev);
  56
  57         for (i = 0; i < gvt->num_types; i++) {
  58                 t = &gvt->types[i];
  59                 if (!strncmp(t->name, name + strlen(driver_name) + 1,
  60                         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 ***type_attrs,
 124                 struct attribute_group ***intel_vgpu_type_groups)
 125 {
 126         *type_attrs = gvt_type_attrs;
 127         *intel_vgpu_type_groups = gvt_vgpu_type_groups;
 128         return true;
 129 }
 130
 131 static bool intel_gvt_init_vgpu_type_groups(struct intel_gvt *gvt)
 132 {
 133         int i, j;
 134         struct intel_vgpu_type *type;
 135         struct attribute_group *group;
 136
 137         for (i = 0; i < gvt->num_types; i++) {
 138                 type = &gvt->types[i];
 139
 140                 group = kzalloc(sizeof(struct attribute_group), GFP_KERNEL);
 141                 if (WARN_ON(!group))
 142                         goto unwind;
 143
 144                 group->name = type->name;
 145                 group->attrs = gvt_type_attrs;
 146                 gvt_vgpu_type_groups[i] = group;
 147         }
 148
 149         return true;
 150
 151 unwind:
 152         for (j = 0; j < i; j++) {
 153                 group = gvt_vgpu_type_groups[j];
 154                 kfree(group);
 155         }
 156
 157         return false;
 158 }
 159
 160 static void intel_gvt_cleanup_vgpu_type_groups(struct intel_gvt *gvt)
 161 {
 162         int i;
 163         struct attribute_group *group;
 164
 165         for (i = 0; i < gvt->num_types; i++) {
 166                 group = gvt_vgpu_type_groups[i];
 167                 gvt_vgpu_type_groups[i] = NULL;
 168                 kfree(group);
 169         }
 170 }
 171
 172 static const struct intel_gvt_ops intel_gvt_ops = {
 173         .emulate_cfg_read = intel_vgpu_emulate_cfg_read,
 174         .emulate_cfg_write = intel_vgpu_emulate_cfg_write,
 175         .emulate_mmio_read = intel_vgpu_emulate_mmio_read,
 176         .emulate_mmio_write = intel_vgpu_emulate_mmio_write,
 177         .vgpu_create = intel_gvt_create_vgpu,
 178         .vgpu_destroy = intel_gvt_destroy_vgpu,
 179         .vgpu_reset = intel_gvt_reset_vgpu,
 180         .vgpu_activate = intel_gvt_activate_vgpu,
 181         .vgpu_deactivate = intel_gvt_deactivate_vgpu,
 182         .gvt_find_vgpu_type = intel_gvt_find_vgpu_type,
 183         .get_gvt_attrs = intel_get_gvt_attrs,
 184         .vgpu_query_plane = intel_vgpu_query_plane,
 185         .vgpu_get_dmabuf = intel_vgpu_get_dmabuf,
 186         .write_protect_handler = intel_vgpu_page_track_handler,
 187 };
 188
 189 /**
 190  * intel_gvt_init_host - Load MPT modules and detect if we're running in host
 191  *
 192  * This function is called at the driver loading stage. If failed to find a
 193  * loadable MPT module or detect currently we're running in a VM, then GVT-g
 194  * will be disabled
 195  *
 196  * Returns:
 197  * Zero on success, negative error code if failed.
 198  *
 199  */
 200 int intel_gvt_init_host(void)
 201 {
 202         if (intel_gvt_host.initialized)
 203                 return 0;
 204
 205         /* Xen DOM U */
 206         if (xen_domain() && !xen_initial_domain())
 207                 return -ENODEV;
 208
 209         /* Try to load MPT modules for hypervisors */
 210         if (xen_initial_domain()) {
 211                 /* In Xen dom0 */
 212                 intel_gvt_host.mpt = try_then_request_module(
 213                                 symbol_get(xengt_mpt), "xengt");
 214                 intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_XEN;
 215         } else {
 216 #if IS_ENABLED(CONFIG_DRM_I915_GVT_KVMGT)
 217                 /* not in Xen. Try KVMGT */
 218                 intel_gvt_host.mpt = try_then_request_module(
 219                                 symbol_get(kvmgt_mpt), "kvmgt");
 220                 intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_KVM;
 221 #endif
 222         }
 223
 224         /* Fail to load MPT modules - bail out */
 225         if (!intel_gvt_host.mpt)
 226                 return -EINVAL;
 227
 228         gvt_dbg_core("Running with hypervisor %s in host mode\n",
 229                         supported_hypervisors[intel_gvt_host.hypervisor_type]);
 230
 231         intel_gvt_host.initialized = true;
 232         return 0;
 233 }
 234
 235 static void init_device_info(struct intel_gvt *gvt)
 236 {
 237         struct intel_gvt_device_info *info = &gvt->device_info;
 238         struct pci_dev *pdev = gvt->dev_priv->drm.pdev;
 239
 240         info->max_support_vgpus = 8;
 241         info->cfg_space_size = PCI_CFG_SPACE_EXP_SIZE;
 242         info->mmio_size = 2 * 1024 * 1024;
 243         info->mmio_bar = 0;
 244         info->gtt_start_offset = 8 * 1024 * 1024;
 245         info->gtt_entry_size = 8;
 246         info->gtt_entry_size_shift = 3;
 247         info->gmadr_bytes_in_cmd = 8;
 248         info->max_surface_size = 36 * 1024 * 1024;
 249         info->msi_cap_offset = pdev->msi_cap;
 250 }
 251
 252 static int gvt_service_thread(void *data)
 253 {
 254         struct intel_gvt *gvt = (struct intel_gvt *)data;
 255         int ret;
 256
 257         gvt_dbg_core("service thread start\n");
 258
 259         while (!kthread_should_stop()) {
 260                 ret = wait_event_interruptible(gvt->service_thread_wq,
 261                                 kthread_should_stop() || gvt->service_request);
 262
 263                 if (kthread_should_stop())
 264                         break;
 265
 266                 if (WARN_ONCE(ret, "service thread is waken up by signal.\n"))
 267                         continue;
 268
 269                 if (test_and_clear_bit(INTEL_GVT_REQUEST_EMULATE_VBLANK,
 270                                         (void *)&gvt->service_request))
 271                         intel_gvt_emulate_vblank(gvt);
 272
 273                 if (test_bit(INTEL_GVT_REQUEST_SCHED,
 274                                 (void *)&gvt->service_request) ||
 275                         test_bit(INTEL_GVT_REQUEST_EVENT_SCHED,
 276                                         (void *)&gvt->service_request)) {
 277                         intel_gvt_schedule(gvt);
 278                 }
 279         }
 280
 281         return 0;
 282 }
 283
 284 static void clean_service_thread(struct intel_gvt *gvt)
 285 {
 286         kthread_stop(gvt->service_thread);
 287 }
 288
 289 static int init_service_thread(struct intel_gvt *gvt)
 290 {
 291         init_waitqueue_head(&gvt->service_thread_wq);
 292
 293         gvt->service_thread = kthread_run(gvt_service_thread,
 294                         gvt, "gvt_service_thread");
 295         if (IS_ERR(gvt->service_thread)) {
 296                 gvt_err("fail to start service thread.\n");
 297                 return PTR_ERR(gvt->service_thread);
 298         }
 299         return 0;
 300 }
 301
 302 /**
 303  * intel_gvt_clean_device - clean a GVT device
 304  * @dev_priv: i915 private
 305  *
 306  * This function is called at the driver unloading stage, to free the
 307  * resources owned by a GVT device.
 308  *
 309  */
 310 void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
 311 {
 312         struct intel_gvt *gvt = to_gvt(dev_priv);
 313
 314         if (WARN_ON(!gvt))
 315                 return;
 316
 317         intel_gvt_debugfs_clean(gvt);
 318         clean_service_thread(gvt);
 319         intel_gvt_clean_cmd_parser(gvt);
 320         intel_gvt_clean_sched_policy(gvt);
 321         intel_gvt_clean_workload_scheduler(gvt);
 322         intel_gvt_clean_gtt(gvt);
 323         intel_gvt_clean_irq(gvt);
 324         intel_gvt_clean_mmio_info(gvt);
 325         intel_gvt_free_firmware(gvt);
 326
 327         intel_gvt_hypervisor_host_exit(&dev_priv->drm.pdev->dev, gvt);
 328         intel_gvt_cleanup_vgpu_type_groups(gvt);
 329         intel_gvt_clean_vgpu_types(gvt);
 330
 331         idr_destroy(&gvt->vgpu_idr);
 332
 333         intel_gvt_destroy_idle_vgpu(gvt->idle_vgpu);
 334
 335         kfree(dev_priv->gvt);
 336         dev_priv->gvt = NULL;
 337 }
 338
 339 /**
 340  * intel_gvt_init_device - initialize a GVT device
 341  * @dev_priv: drm i915 private data
 342  *
 343  * This function is called at the initialization stage, to initialize
 344  * necessary GVT components.
 345  *
 346  * Returns:
 347  * Zero on success, negative error code if failed.
 348  *
 349  */
 350 int intel_gvt_init_device(struct drm_i915_private *dev_priv)
 351 {
 352         struct intel_gvt *gvt;
 353         struct intel_vgpu *vgpu;
 354         int ret;
 355
 356         /*
 357          * Cannot initialize GVT device without intel_gvt_host gets
 358          * initialized first.
 359          */
 360         if (WARN_ON(!intel_gvt_host.initialized))
 361                 return -EINVAL;
 362
 363         if (WARN_ON(dev_priv->gvt))
 364                 return -EEXIST;
 365
 366         gvt = kzalloc(sizeof(struct intel_gvt), GFP_KERNEL);
 367         if (!gvt)
 368                 return -ENOMEM;
 369
 370         gvt_dbg_core("init gvt device\n");
 371
 372         idr_init(&gvt->vgpu_idr);
 373         spin_lock_init(&gvt->scheduler.mmio_context_lock);
 374         mutex_init(&gvt->lock);
 375         mutex_init(&gvt->sched_lock);
 376         gvt->dev_priv = dev_priv;
 377
 378         init_device_info(gvt);
 379
 380         ret = intel_gvt_setup_mmio_info(gvt);
 381         if (ret)
 382                 goto out_clean_idr;
 383
 384         intel_gvt_init_engine_mmio_context(gvt);
 385
 386         ret = intel_gvt_load_firmware(gvt);
 387         if (ret)
 388                 goto out_clean_mmio_info;
 389
 390         ret = intel_gvt_init_irq(gvt);
 391         if (ret)
 392                 goto out_free_firmware;
 393
 394         ret = intel_gvt_init_gtt(gvt);
 395         if (ret)
 396                 goto out_clean_irq;
 397
 398         ret = intel_gvt_init_workload_scheduler(gvt);
 399         if (ret)
 400                 goto out_clean_gtt;
 401
 402         ret = intel_gvt_init_sched_policy(gvt);
 403         if (ret)
 404                 goto out_clean_workload_scheduler;
 405
 406         ret = intel_gvt_init_cmd_parser(gvt);
 407         if (ret)
 408                 goto out_clean_sched_policy;
 409
 410         ret = init_service_thread(gvt);
 411         if (ret)
 412                 goto out_clean_cmd_parser;
 413
 414         ret = intel_gvt_init_vgpu_types(gvt);
 415         if (ret)
 416                 goto out_clean_thread;
 417
 418         ret = intel_gvt_init_vgpu_type_groups(gvt);
 419         if (ret == false) {
 420                 gvt_err("failed to init vgpu type groups: %d\n", ret);
 421                 goto out_clean_types;
 422         }
 423
 424         ret = intel_gvt_hypervisor_host_init(&dev_priv->drm.pdev->dev, gvt,
 425                                 &intel_gvt_ops);
 426         if (ret) {
 427                 gvt_err("failed to register gvt-g host device: %d\n", ret);
 428                 goto out_clean_types;
 429         }
 430
 431         vgpu = intel_gvt_create_idle_vgpu(gvt);
 432         if (IS_ERR(vgpu)) {
 433                 ret = PTR_ERR(vgpu);
 434                 gvt_err("failed to create idle vgpu\n");
 435                 goto out_clean_types;
 436         }
 437         gvt->idle_vgpu = vgpu;
 438
 439         ret = intel_gvt_debugfs_init(gvt);
 440         if (ret)
 441                 gvt_err("debugfs registeration failed, go on.\n");
 442
 443         gvt_dbg_core("gvt device initialization is done\n");
 444         dev_priv->gvt = gvt;
 445         return 0;
 446
 447 out_clean_types:
 448         intel_gvt_clean_vgpu_types(gvt);
 449 out_clean_thread:
 450         clean_service_thread(gvt);
 451 out_clean_cmd_parser:
 452         intel_gvt_clean_cmd_parser(gvt);
 453 out_clean_sched_policy:
 454         intel_gvt_clean_sched_policy(gvt);
 455 out_clean_workload_scheduler:
 456         intel_gvt_clean_workload_scheduler(gvt);
 457 out_clean_gtt:
 458         intel_gvt_clean_gtt(gvt);
 459 out_clean_irq:
 460         intel_gvt_clean_irq(gvt);
 461 out_free_firmware:
 462         intel_gvt_free_firmware(gvt);
 463 out_clean_mmio_info:
 464         intel_gvt_clean_mmio_info(gvt);
 465 out_clean_idr:
 466         idr_destroy(&gvt->vgpu_idr);
 467         kfree(gvt);
 468         return ret;
 469 }
 470
 471 #if IS_ENABLED(CONFIG_DRM_I915_GVT_KVMGT)
 472 MODULE_SOFTDEP("pre: kvmgt");
 473 #endif