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 #include "gvt/gvt.h"
  28
  29 /**
  30  * DOC: Intel GVT-g host support
  31  *
  32  * Intel GVT-g is a graphics virtualization technology which shares the
  33  * GPU among multiple virtual machines on a time-sharing basis. Each
  34  * virtual machine is presented a virtual GPU (vGPU), which has equivalent
  35  * features as the underlying physical GPU (pGPU), so i915 driver can run
  36  * seamlessly in a virtual machine.
  37  *
  38  * To virtualize GPU resources GVT-g driver depends on hypervisor technology
  39  * e.g KVM/VFIO/mdev, Xen, etc. to provide resource access trapping capability
  40  * and be virtualized within GVT-g device module. More architectural design
  41  * doc is available on https://01.org/group/2230/documentation-list.
  42  */
  43
  44 static bool is_supported_device(struct drm_i915_private *dev_priv)
  45 {
  46         if (IS_BROADWELL(dev_priv))
  47                 return true;
  48         if (IS_SKYLAKE(dev_priv))
  49                 return true;
  50         if (IS_KABYLAKE(dev_priv))
  51                 return true;
  52         if (IS_BROXTON(dev_priv))
  53                 return true;
  54         if (IS_COFFEELAKE(dev_priv))
  55                 return true;
  56         if (IS_COMETLAKE(dev_priv))
  57                 return true;
  58
  59         return false;
  60 }
  61
  62 /**
  63  * intel_gvt_sanitize_options - sanitize GVT related options
  64  * @dev_priv: drm i915 private data
  65  *
  66  * This function is called at the i915 options sanitize stage.
  67  */
  68 void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv)
  69 {
  70         if (!dev_priv->params.enable_gvt)
  71                 return;
  72
  73         if (intel_vgpu_active(dev_priv)) {
  74                 drm_info(&dev_priv->drm, "GVT-g is disabled for guest\n");
  75                 goto bail;
  76         }
  77
  78         if (!is_supported_device(dev_priv)) {
  79                 drm_info(&dev_priv->drm,
  80                          "Unsupported device. GVT-g is disabled\n");
  81                 goto bail;
  82         }
  83
  84         return;
  85 bail:
  86         dev_priv->params.enable_gvt = 0;
  87 }
  88
  89 /**
  90  * intel_gvt_init - initialize GVT components
  91  * @dev_priv: drm i915 private data
  92  *
  93  * This function is called at the initialization stage to create a GVT device.
  94  *
  95  * Returns:
  96  * Zero on success, negative error code if failed.
  97  *
  98  */
  99 int intel_gvt_init(struct drm_i915_private *dev_priv)
 100 {
 101         int ret;
 102
 103         if (i915_inject_probe_failure(dev_priv))
 104                 return -ENODEV;
 105
 106         if (!dev_priv->params.enable_gvt) {
 107                 drm_dbg(&dev_priv->drm,
 108                         "GVT-g is disabled by kernel params\n");
 109                 return 0;
 110         }
 111
 112         if (intel_uc_wants_guc_submission(&dev_priv->gt.uc)) {
 113                 drm_err(&dev_priv->drm,
 114                         "i915 GVT-g loading failed due to Graphics virtualization is not yet supported with GuC submission\n");
 115                 return -EIO;
 116         }
 117
 118         ret = intel_gvt_init_device(dev_priv);
 119         if (ret) {
 120                 drm_dbg(&dev_priv->drm, "Fail to init GVT device\n");
 121                 goto bail;
 122         }
 123
 124         return 0;
 125
 126 bail:
 127         dev_priv->params.enable_gvt = 0;
 128         return 0;
 129 }
 130
 131 static inline bool intel_gvt_active(struct drm_i915_private *dev_priv)
 132 {
 133         return dev_priv->gvt;
 134 }
 135
 136 /**
 137  * intel_gvt_driver_remove - cleanup GVT components when i915 driver is
 138  *                           unbinding
 139  * @dev_priv: drm i915 private *
 140  *
 141  * This function is called at the i915 driver unloading stage, to shutdown
 142  * GVT components and release the related resources.
 143  */
 144 void intel_gvt_driver_remove(struct drm_i915_private *dev_priv)
 145 {
 146         if (!intel_gvt_active(dev_priv))
 147                 return;
 148
 149         intel_gvt_clean_device(dev_priv);
 150 }
 151
 152 /**
 153  * intel_gvt_resume - GVT resume routine wapper
 154  *
 155  * @dev_priv: drm i915 private *
 156  *
 157  * This function is called at the i915 driver resume stage to restore required
 158  * HW status for GVT so that vGPU can continue running after resumed.
 159  */
 160 void intel_gvt_resume(struct drm_i915_private *dev_priv)
 161 {
 162         if (intel_gvt_active(dev_priv))
 163                 intel_gvt_pm_resume(dev_priv->gvt);
 164 }