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 56 return false; 57 } 58 59 /** 60 * intel_gvt_sanitize_options - sanitize GVT related options 61 * @dev_priv: drm i915 private data 62 * 63 * This function is called at the i915 options sanitize stage. 64 */ 65 void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv) 66 { 67 if (!i915_modparams.enable_gvt) 68 return; 69 70 if (intel_vgpu_active(dev_priv)) { 71 drm_info(&dev_priv->drm, "GVT-g is disabled for guest\n"); 72 goto bail; 73 } 74 75 if (!is_supported_device(dev_priv)) { 76 drm_info(&dev_priv->drm, 77 "Unsupported device. GVT-g is disabled\n"); 78 goto bail; 79 } 80 81 return; 82 bail: 83 i915_modparams.enable_gvt = 0; 84 } 85 86 /** 87 * intel_gvt_init - initialize GVT components 88 * @dev_priv: drm i915 private data 89 * 90 * This function is called at the initialization stage to create a GVT device. 91 * 92 * Returns: 93 * Zero on success, negative error code if failed. 94 * 95 */ 96 int intel_gvt_init(struct drm_i915_private *dev_priv) 97 { 98 int ret; 99 100 if (i915_inject_probe_failure(dev_priv)) 101 return -ENODEV; 102 103 if (!i915_modparams.enable_gvt) { 104 drm_dbg(&dev_priv->drm, 105 "GVT-g is disabled by kernel params\n"); 106 return 0; 107 } 108 109 if (intel_uc_wants_guc_submission(&dev_priv->gt.uc)) { 110 drm_err(&dev_priv->drm, 111 "i915 GVT-g loading failed due to Graphics virtualization is not yet supported with GuC submission\n"); 112 return -EIO; 113 } 114 115 ret = intel_gvt_init_device(dev_priv); 116 if (ret) { 117 drm_dbg(&dev_priv->drm, "Fail to init GVT device\n"); 118 goto bail; 119 } 120 121 return 0; 122 123 bail: 124 i915_modparams.enable_gvt = 0; 125 return 0; 126 } 127 128 static inline bool intel_gvt_active(struct drm_i915_private *dev_priv) 129 { 130 return dev_priv->gvt; 131 } 132 133 /** 134 * intel_gvt_driver_remove - cleanup GVT components when i915 driver is 135 * unbinding 136 * @dev_priv: drm i915 private * 137 * 138 * This function is called at the i915 driver unloading stage, to shutdown 139 * GVT components and release the related resources. 140 */ 141 void intel_gvt_driver_remove(struct drm_i915_private *dev_priv) 142 { 143 if (!intel_gvt_active(dev_priv)) 144 return; 145 146 intel_gvt_clean_device(dev_priv); 147 } 148