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
  40 struct intel_gvt_host intel_gvt_host;
  41
  42 static const char * const supported_hypervisors[] = {
  43         [INTEL_GVT_HYPERVISOR_XEN] = "XEN",
  44         [INTEL_GVT_HYPERVISOR_KVM] = "KVM",
  45 };
  46
  47 static const struct intel_gvt_ops intel_gvt_ops = {
  48         .emulate_cfg_read = intel_vgpu_emulate_cfg_read,
  49         .emulate_cfg_write = intel_vgpu_emulate_cfg_write,
  50         .emulate_mmio_read = intel_vgpu_emulate_mmio_read,
  51         .emulate_mmio_write = intel_vgpu_emulate_mmio_write,
  52         .vgpu_create = intel_gvt_create_vgpu,
  53         .vgpu_destroy = intel_gvt_destroy_vgpu,
  54         .vgpu_reset = intel_gvt_reset_vgpu,
  55 };
  56
  57 /**
  58  * intel_gvt_init_host - Load MPT modules and detect if we're running in host
  59  * @gvt: intel gvt device
  60  *
  61  * This function is called at the driver loading stage. If failed to find a
  62  * loadable MPT module or detect currently we're running in a VM, then GVT-g
  63  * will be disabled
  64  *
  65  * Returns:
  66  * Zero on success, negative error code if failed.
  67  *
  68  */
  69 int intel_gvt_init_host(void)
  70 {
  71         if (intel_gvt_host.initialized)
  72                 return 0;
  73
  74         /* Xen DOM U */
  75         if (xen_domain() && !xen_initial_domain())
  76                 return -ENODEV;
  77
  78         /* Try to load MPT modules for hypervisors */
  79         if (xen_initial_domain()) {
  80                 /* In Xen dom0 */
  81                 intel_gvt_host.mpt = try_then_request_module(
  82                                 symbol_get(xengt_mpt), "xengt");
  83                 intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_XEN;
  84         } else {
  85 #if IS_ENABLED(CONFIG_DRM_I915_GVT_KVMGT)
  86                 /* not in Xen. Try KVMGT */
  87                 intel_gvt_host.mpt = try_then_request_module(
  88                                 symbol_get(kvmgt_mpt), "kvmgt");
  89                 intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_KVM;
  90 #endif
  91         }
  92
  93         /* Fail to load MPT modules - bail out */
  94         if (!intel_gvt_host.mpt)
  95                 return -EINVAL;
  96
  97         gvt_dbg_core("Running with hypervisor %s in host mode\n",
  98                         supported_hypervisors[intel_gvt_host.hypervisor_type]);
  99
 100         intel_gvt_host.initialized = true;
 101         return 0;
 102 }
 103
 104 static void init_device_info(struct intel_gvt *gvt)
 105 {
 106         struct intel_gvt_device_info *info = &gvt->device_info;
 107         struct pci_dev *pdev = gvt->dev_priv->drm.pdev;
 108
 109         if (IS_BROADWELL(gvt->dev_priv) || IS_SKYLAKE(gvt->dev_priv)) {
 110                 info->max_support_vgpus = 8;
 111                 info->cfg_space_size = 256;
 112                 info->mmio_size = 2 * 1024 * 1024;
 113                 info->mmio_bar = 0;
 114                 info->gtt_start_offset = 8 * 1024 * 1024;
 115                 info->gtt_entry_size = 8;
 116                 info->gtt_entry_size_shift = 3;
 117                 info->gmadr_bytes_in_cmd = 8;
 118                 info->max_surface_size = 36 * 1024 * 1024;
 119         }
 120         info->msi_cap_offset = pdev->msi_cap;
 121 }
 122
 123 static int gvt_service_thread(void *data)
 124 {
 125         struct intel_gvt *gvt = (struct intel_gvt *)data;
 126         int ret;
 127
 128         gvt_dbg_core("service thread start\n");
 129
 130         while (!kthread_should_stop()) {
 131                 ret = wait_event_interruptible(gvt->service_thread_wq,
 132                                 kthread_should_stop() || gvt->service_request);
 133
 134                 if (kthread_should_stop())
 135                         break;
 136
 137                 if (WARN_ONCE(ret, "service thread is waken up by signal.\n"))
 138                         continue;
 139
 140                 if (test_and_clear_bit(INTEL_GVT_REQUEST_EMULATE_VBLANK,
 141                                         (void *)&gvt->service_request)) {
 142                         mutex_lock(&gvt->lock);
 143                         intel_gvt_emulate_vblank(gvt);
 144                         mutex_unlock(&gvt->lock);
 145                 }
 146         }
 147
 148         return 0;
 149 }
 150
 151 static void clean_service_thread(struct intel_gvt *gvt)
 152 {
 153         kthread_stop(gvt->service_thread);
 154 }
 155
 156 static int init_service_thread(struct intel_gvt *gvt)
 157 {
 158         init_waitqueue_head(&gvt->service_thread_wq);
 159
 160         gvt->service_thread = kthread_run(gvt_service_thread,
 161                         gvt, "gvt_service_thread");
 162         if (IS_ERR(gvt->service_thread)) {
 163                 gvt_err("fail to start service thread.\n");
 164                 return PTR_ERR(gvt->service_thread);
 165         }
 166         return 0;
 167 }
 168
 169 /**
 170  * intel_gvt_clean_device - clean a GVT device
 171  * @gvt: intel gvt device
 172  *
 173  * This function is called at the driver unloading stage, to free the
 174  * resources owned by a GVT device.
 175  *
 176  */
 177 void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
 178 {
 179         struct intel_gvt *gvt = to_gvt(dev_priv);
 180
 181         if (WARN_ON(!gvt))
 182                 return;
 183
 184         clean_service_thread(gvt);
 185         intel_gvt_clean_cmd_parser(gvt);
 186         intel_gvt_clean_sched_policy(gvt);
 187         intel_gvt_clean_workload_scheduler(gvt);
 188         intel_gvt_clean_opregion(gvt);
 189         intel_gvt_clean_gtt(gvt);
 190         intel_gvt_clean_irq(gvt);
 191         intel_gvt_clean_mmio_info(gvt);
 192         intel_gvt_free_firmware(gvt);
 193
 194         intel_gvt_hypervisor_host_exit(&dev_priv->drm.pdev->dev, gvt);
 195         intel_gvt_clean_vgpu_types(gvt);
 196
 197         idr_destroy(&gvt->vgpu_idr);
 198
 199         kfree(dev_priv->gvt);
 200         dev_priv->gvt = NULL;
 201 }
 202
 203 /**
 204  * intel_gvt_init_device - initialize a GVT device
 205  * @dev_priv: drm i915 private data
 206  *
 207  * This function is called at the initialization stage, to initialize
 208  * necessary GVT components.
 209  *
 210  * Returns:
 211  * Zero on success, negative error code if failed.
 212  *
 213  */
 214 int intel_gvt_init_device(struct drm_i915_private *dev_priv)
 215 {
 216         struct intel_gvt *gvt;
 217         int ret;
 218
 219         /*
 220          * Cannot initialize GVT device without intel_gvt_host gets
 221          * initialized first.
 222          */
 223         if (WARN_ON(!intel_gvt_host.initialized))
 224                 return -EINVAL;
 225
 226         if (WARN_ON(dev_priv->gvt))
 227                 return -EEXIST;
 228
 229         gvt = kzalloc(sizeof(struct intel_gvt), GFP_KERNEL);
 230         if (!gvt)
 231                 return -ENOMEM;
 232
 233         gvt_dbg_core("init gvt device\n");
 234
 235         idr_init(&gvt->vgpu_idr);
 236
 237         mutex_init(&gvt->lock);
 238         gvt->dev_priv = dev_priv;
 239
 240         init_device_info(gvt);
 241
 242         ret = intel_gvt_setup_mmio_info(gvt);
 243         if (ret)
 244                 goto out_clean_idr;
 245
 246         ret = intel_gvt_load_firmware(gvt);
 247         if (ret)
 248                 goto out_clean_mmio_info;
 249
 250         ret = intel_gvt_init_irq(gvt);
 251         if (ret)
 252                 goto out_free_firmware;
 253
 254         ret = intel_gvt_init_gtt(gvt);
 255         if (ret)
 256                 goto out_clean_irq;
 257
 258         ret = intel_gvt_init_opregion(gvt);
 259         if (ret)
 260                 goto out_clean_gtt;
 261
 262         ret = intel_gvt_init_workload_scheduler(gvt);
 263         if (ret)
 264                 goto out_clean_opregion;
 265
 266         ret = intel_gvt_init_sched_policy(gvt);
 267         if (ret)
 268                 goto out_clean_workload_scheduler;
 269
 270         ret = intel_gvt_init_cmd_parser(gvt);
 271         if (ret)
 272                 goto out_clean_sched_policy;
 273
 274         ret = init_service_thread(gvt);
 275         if (ret)
 276                 goto out_clean_cmd_parser;
 277
 278         ret = intel_gvt_init_vgpu_types(gvt);
 279         if (ret)
 280                 goto out_clean_thread;
 281
 282         ret = intel_gvt_hypervisor_host_init(&dev_priv->drm.pdev->dev, gvt,
 283                                 &intel_gvt_ops);
 284         if (ret) {
 285                 gvt_err("failed to register gvt-g host device: %d\n", ret);
 286                 goto out_clean_types;
 287         }
 288
 289         gvt_dbg_core("gvt device initialization is done\n");
 290         dev_priv->gvt = gvt;
 291         return 0;
 292
 293 out_clean_types:
 294         intel_gvt_clean_vgpu_types(gvt);
 295 out_clean_thread:
 296         clean_service_thread(gvt);
 297 out_clean_cmd_parser:
 298         intel_gvt_clean_cmd_parser(gvt);
 299 out_clean_sched_policy:
 300         intel_gvt_clean_sched_policy(gvt);
 301 out_clean_workload_scheduler:
 302         intel_gvt_clean_workload_scheduler(gvt);
 303 out_clean_opregion:
 304         intel_gvt_clean_opregion(gvt);
 305 out_clean_gtt:
 306         intel_gvt_clean_gtt(gvt);
 307 out_clean_irq:
 308         intel_gvt_clean_irq(gvt);
 309 out_free_firmware:
 310         intel_gvt_free_firmware(gvt);
 311 out_clean_mmio_info:
 312         intel_gvt_clean_mmio_info(gvt);
 313 out_clean_idr:
 314         idr_destroy(&gvt->vgpu_idr);
 315         kfree(gvt);
 316         return ret;
 317 }