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         int ret;
  72
  73         if (intel_gvt_host.initialized)
  74                 return 0;
  75
  76         /* Xen DOM U */
  77         if (xen_domain() && !xen_initial_domain())
  78                 return -ENODEV;
  79
  80         /* Try to load MPT modules for hypervisors */
  81         if (xen_initial_domain()) {
  82                 /* In Xen dom0 */
  83                 intel_gvt_host.mpt = try_then_request_module(
  84                                 symbol_get(xengt_mpt), "xengt");
  85                 intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_XEN;
  86         } else {
  87 #if IS_ENABLED(CONFIG_DRM_I915_GVT_KVMGT)
  88                 /* not in Xen. Try KVMGT */
  89                 intel_gvt_host.mpt = try_then_request_module(
  90                                 symbol_get(kvmgt_mpt), "kvmgt");
  91                 intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_KVM;
  92 #endif
  93         }
  94
  95         /* Fail to load MPT modules - bail out */
  96         if (!intel_gvt_host.mpt)
  97                 return -EINVAL;
  98
  99         /* Try to detect if we're running in host instead of VM. */
 100         ret = intel_gvt_hypervisor_detect_host();
 101         if (ret)
 102                 return -ENODEV;
 103
 104         gvt_dbg_core("Running with hypervisor %s in host mode\n",
 105                         supported_hypervisors[intel_gvt_host.hypervisor_type]);
 106
 107         intel_gvt_host.initialized = true;
 108         return 0;
 109 }
 110
 111 static void init_device_info(struct intel_gvt *gvt)
 112 {
 113         struct intel_gvt_device_info *info = &gvt->device_info;
 114         struct pci_dev *pdev = gvt->dev_priv->drm.pdev;
 115
 116         if (IS_BROADWELL(gvt->dev_priv) || IS_SKYLAKE(gvt->dev_priv)) {
 117                 info->max_support_vgpus = 8;
 118                 info->cfg_space_size = 256;
 119                 info->mmio_size = 2 * 1024 * 1024;
 120                 info->mmio_bar = 0;
 121                 info->gtt_start_offset = 8 * 1024 * 1024;
 122                 info->gtt_entry_size = 8;
 123                 info->gtt_entry_size_shift = 3;
 124                 info->gmadr_bytes_in_cmd = 8;
 125                 info->max_surface_size = 36 * 1024 * 1024;
 126         }
 127         info->msi_cap_offset = pdev->msi_cap;
 128 }
 129
 130 static int gvt_service_thread(void *data)
 131 {
 132         struct intel_gvt *gvt = (struct intel_gvt *)data;
 133         int ret;
 134
 135         gvt_dbg_core("service thread start\n");
 136
 137         while (!kthread_should_stop()) {
 138                 ret = wait_event_interruptible(gvt->service_thread_wq,
 139                                 kthread_should_stop() || gvt->service_request);
 140
 141                 if (kthread_should_stop())
 142                         break;
 143
 144                 if (WARN_ONCE(ret, "service thread is waken up by signal.\n"))
 145                         continue;
 146
 147                 if (test_and_clear_bit(INTEL_GVT_REQUEST_EMULATE_VBLANK,
 148                                         (void *)&gvt->service_request)) {
 149                         mutex_lock(&gvt->lock);
 150                         intel_gvt_emulate_vblank(gvt);
 151                         mutex_unlock(&gvt->lock);
 152                 }
 153         }
 154
 155         return 0;
 156 }
 157
 158 static void clean_service_thread(struct intel_gvt *gvt)
 159 {
 160         kthread_stop(gvt->service_thread);
 161 }
 162
 163 static int init_service_thread(struct intel_gvt *gvt)
 164 {
 165         init_waitqueue_head(&gvt->service_thread_wq);
 166
 167         gvt->service_thread = kthread_run(gvt_service_thread,
 168                         gvt, "gvt_service_thread");
 169         if (IS_ERR(gvt->service_thread)) {
 170                 gvt_err("fail to start service thread.\n");
 171                 return PTR_ERR(gvt->service_thread);
 172         }
 173         return 0;
 174 }
 175
 176 /**
 177  * intel_gvt_clean_device - clean a GVT device
 178  * @gvt: intel gvt device
 179  *
 180  * This function is called at the driver unloading stage, to free the
 181  * resources owned by a GVT device.
 182  *
 183  */
 184 void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
 185 {
 186         struct intel_gvt *gvt = to_gvt(dev_priv);
 187
 188         if (WARN_ON(!gvt))
 189                 return;
 190
 191         clean_service_thread(gvt);
 192         intel_gvt_clean_cmd_parser(gvt);
 193         intel_gvt_clean_sched_policy(gvt);
 194         intel_gvt_clean_workload_scheduler(gvt);
 195         intel_gvt_clean_opregion(gvt);
 196         intel_gvt_clean_gtt(gvt);
 197         intel_gvt_clean_irq(gvt);
 198         intel_gvt_clean_mmio_info(gvt);
 199         intel_gvt_free_firmware(gvt);
 200
 201         intel_gvt_hypervisor_host_exit(&dev_priv->drm.pdev->dev, gvt);
 202         intel_gvt_clean_vgpu_types(gvt);
 203
 204         kfree(dev_priv->gvt);
 205         dev_priv->gvt = NULL;
 206 }
 207
 208 /**
 209  * intel_gvt_init_device - initialize a GVT device
 210  * @dev_priv: drm i915 private data
 211  *
 212  * This function is called at the initialization stage, to initialize
 213  * necessary GVT components.
 214  *
 215  * Returns:
 216  * Zero on success, negative error code if failed.
 217  *
 218  */
 219 int intel_gvt_init_device(struct drm_i915_private *dev_priv)
 220 {
 221         struct intel_gvt *gvt;
 222         int ret;
 223
 224         /*
 225          * Cannot initialize GVT device without intel_gvt_host gets
 226          * initialized first.
 227          */
 228         if (WARN_ON(!intel_gvt_host.initialized))
 229                 return -EINVAL;
 230
 231         if (WARN_ON(dev_priv->gvt))
 232                 return -EEXIST;
 233
 234         gvt = kzalloc(sizeof(struct intel_gvt), GFP_KERNEL);
 235         if (!gvt)
 236                 return -ENOMEM;
 237
 238         gvt_dbg_core("init gvt device\n");
 239
 240         mutex_init(&gvt->lock);
 241         gvt->dev_priv = dev_priv;
 242
 243         init_device_info(gvt);
 244
 245         ret = intel_gvt_setup_mmio_info(gvt);
 246         if (ret)
 247                 return ret;
 248
 249         ret = intel_gvt_load_firmware(gvt);
 250         if (ret)
 251                 goto out_clean_mmio_info;
 252
 253         ret = intel_gvt_init_irq(gvt);
 254         if (ret)
 255                 goto out_free_firmware;
 256
 257         ret = intel_gvt_init_gtt(gvt);
 258         if (ret)
 259                 goto out_clean_irq;
 260
 261         ret = intel_gvt_init_opregion(gvt);
 262         if (ret)
 263                 goto out_clean_gtt;
 264
 265         ret = intel_gvt_init_workload_scheduler(gvt);
 266         if (ret)
 267                 goto out_clean_opregion;
 268
 269         ret = intel_gvt_init_sched_policy(gvt);
 270         if (ret)
 271                 goto out_clean_workload_scheduler;
 272
 273         ret = intel_gvt_init_cmd_parser(gvt);
 274         if (ret)
 275                 goto out_clean_sched_policy;
 276
 277         ret = init_service_thread(gvt);
 278         if (ret)
 279                 goto out_clean_cmd_parser;
 280
 281         ret = intel_gvt_init_vgpu_types(gvt);
 282         if (ret)
 283                 goto out_clean_thread;
 284
 285         ret = intel_gvt_hypervisor_host_init(&dev_priv->drm.pdev->dev, gvt,
 286                                 &intel_gvt_ops);
 287         if (ret) {
 288                 gvt_err("failed to register gvt-g host device: %d\n", ret);
 289                 goto out_clean_types;
 290         }
 291
 292         gvt_dbg_core("gvt device initialization is done\n");
 293         dev_priv->gvt = gvt;
 294         return 0;
 295
 296 out_clean_types:
 297         intel_gvt_clean_vgpu_types(gvt);
 298 out_clean_thread:
 299         clean_service_thread(gvt);
 300 out_clean_cmd_parser:
 301         intel_gvt_clean_cmd_parser(gvt);
 302 out_clean_sched_policy:
 303         intel_gvt_clean_sched_policy(gvt);
 304 out_clean_workload_scheduler:
 305         intel_gvt_clean_workload_scheduler(gvt);
 306 out_clean_opregion:
 307         intel_gvt_clean_opregion(gvt);
 308 out_clean_gtt:
 309         intel_gvt_clean_gtt(gvt);
 310 out_clean_irq:
 311         intel_gvt_clean_irq(gvt);
 312 out_free_firmware:
 313         intel_gvt_free_firmware(gvt);
 314 out_clean_mmio_info:
 315         intel_gvt_clean_mmio_info(gvt);
 316         kfree(gvt);
 317         return ret;
 318 }