drivers/gpu/drm/i915/intel_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
  24 #include "i915_drv.h"
  25 #include "i915_vgpu.h"
  26 #include "intel_gvt.h"
  27
  28 /**
  29  * DOC: Intel GVT-g host support
  30  *
  31  * Intel GVT-g is a graphics virtualization technology which shares the
  32  * GPU among multiple virtual machines on a time-sharing basis. Each
  33  * virtual machine is presented a virtual GPU (vGPU), which has equivalent
  34  * features as the underlying physical GPU (pGPU), so i915 driver can run
  35  * seamlessly in a virtual machine.
  36  *
  37  * To virtualize GPU resources GVT-g driver depends on hypervisor technology
  38  * e.g KVM/VFIO/mdev, Xen, etc. to provide resource access trapping capability
  39  * and be virtualized within GVT-g device module. More architectural design
  40  * doc is available on https://01.org/group/2230/documentation-list.
  41  */
  42
  43 static bool is_supported_device(struct drm_i915_private *dev_priv)
  44 {
  45         if (IS_BROADWELL(dev_priv))
  46                 return true;
  47         if (IS_SKYLAKE(dev_priv))
  48                 return true;
  49         if (IS_KABYLAKE(dev_priv))
  50                 return true;
  51         if (IS_BROXTON(dev_priv))
  52                 return true;
  53         if (IS_COFFEELAKE(dev_priv))
  54                 return true;
  55         if (IS_COMETLAKE(dev_priv))
  56                 return true;
  57
  58         return false;
  59 }
  60
  61 /**
  62  * intel_gvt_sanitize_options - sanitize GVT related options
  63  * @dev_priv: drm i915 private data
  64  *
  65  * This function is called at the i915 options sanitize stage.
  66  */
  67 void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv)
  68 {
  69         if (!dev_priv->params.enable_gvt)
  70                 return;
  71
  72         if (intel_vgpu_active(dev_priv)) {
  73                 drm_info(&dev_priv->drm, "GVT-g is disabled for guest\n");
  74                 goto bail;
  75         }
  76
  77         if (!is_supported_device(dev_priv)) {
  78                 drm_info(&dev_priv->drm,
  79                          "Unsupported device. GVT-g is disabled\n");
  80                 goto bail;
  81         }
  82
  83         return;
  84 bail:
  85         dev_priv->params.enable_gvt = 0;
  86 }
  87
  88 /**
  89  * intel_gvt_init - initialize GVT components
  90  * @dev_priv: drm i915 private data
  91  *
  92  * This function is called at the initialization stage to create a GVT device.
  93  *
  94  * Returns:
  95  * Zero on success, negative error code if failed.
  96  *
  97  */
  98 int intel_gvt_init(struct drm_i915_private *dev_priv)
  99 {
 100         int ret;
 101
 102         if (i915_inject_probe_failure(dev_priv))
 103                 return -ENODEV;
 104
 105         if (!dev_priv->params.enable_gvt) {
 106                 drm_dbg(&dev_priv->drm,
 107                         "GVT-g is disabled by kernel params\n");
 108                 return 0;
 109         }
 110
 111         if (intel_uc_wants_guc_submission(&dev_priv->gt.uc)) {
 112                 drm_err(&dev_priv->drm,
 113                         "i915 GVT-g loading failed due to Graphics virtualization is not yet supported with GuC submission\n");
 114                 return -EIO;
 115         }
 116
 117         ret = intel_gvt_init_device(dev_priv);
 118         if (ret) {
 119                 drm_dbg(&dev_priv->drm, "Fail to init GVT device\n");
 120                 goto bail;
 121         }
 122
 123         return 0;
 124
 125 bail:
 126         dev_priv->params.enable_gvt = 0;
 127         return 0;
 128 }
 129
 130 static inline bool intel_gvt_active(struct drm_i915_private *dev_priv)
 131 {
 132         return dev_priv->gvt;
 133 }
 134
 135 /**
 136  * intel_gvt_driver_remove - cleanup GVT components when i915 driver is
 137  *                           unbinding
 138  * @dev_priv: drm i915 private *
 139  *
 140  * This function is called at the i915 driver unloading stage, to shutdown
 141  * GVT components and release the related resources.
 142  */
 143 void intel_gvt_driver_remove(struct drm_i915_private *dev_priv)
 144 {
 145         if (!intel_gvt_active(dev_priv))
 146                 return;
 147
 148         intel_gvt_clean_device(dev_priv);
 149 }