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 } 150