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(&to_gt(dev_priv)->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 } 165