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 "intel_gvt.h" 26 27 /** 28 * DOC: Intel GVT-g host support 29 * 30 * Intel GVT-g is a graphics virtualization technology which shares the 31 * GPU among multiple virtual machines on a time-sharing basis. Each 32 * virtual machine is presented a virtual GPU (vGPU), which has equivalent 33 * features as the underlying physical GPU (pGPU), so i915 driver can run 34 * seamlessly in a virtual machine. 35 * 36 * To virtualize GPU resources GVT-g driver depends on hypervisor technology 37 * e.g KVM/VFIO/mdev, Xen, etc. to provide resource access trapping capability 38 * and be virtualized within GVT-g device module. More architectural design 39 * doc is available on https://01.org/group/2230/documentation-list. 40 */ 41 42 static bool is_supported_device(struct drm_i915_private *dev_priv) 43 { 44 if (IS_BROADWELL(dev_priv)) 45 return true; 46 if (IS_SKYLAKE(dev_priv)) 47 return true; 48 return false; 49 } 50 51 /** 52 * intel_gvt_init - initialize GVT components 53 * @dev_priv: drm i915 private data 54 * 55 * This function is called at the initialization stage to create a GVT device. 56 * 57 * Returns: 58 * Zero on success, negative error code if failed. 59 * 60 */ 61 int intel_gvt_init(struct drm_i915_private *dev_priv) 62 { 63 int ret; 64 65 if (!i915.enable_gvt) { 66 DRM_DEBUG_DRIVER("GVT-g is disabled by kernel params\n"); 67 return 0; 68 } 69 70 if (!is_supported_device(dev_priv)) { 71 DRM_DEBUG_DRIVER("Unsupported device. GVT-g is disabled\n"); 72 goto bail; 73 } 74 75 /* 76 * We're not in host or fail to find a MPT module, disable GVT-g 77 */ 78 ret = intel_gvt_init_host(); 79 if (ret) { 80 DRM_DEBUG_DRIVER("Not in host or MPT modules not found\n"); 81 goto bail; 82 } 83 84 ret = intel_gvt_init_device(dev_priv); 85 if (ret) { 86 DRM_DEBUG_DRIVER("Fail to init GVT device\n"); 87 goto bail; 88 } 89 90 return 0; 91 92 bail: 93 i915.enable_gvt = 0; 94 return 0; 95 } 96 97 /** 98 * intel_gvt_cleanup - cleanup GVT components when i915 driver is unloading 99 * @dev_priv: drm i915 private * 100 * 101 * This function is called at the i915 driver unloading stage, to shutdown 102 * GVT components and release the related resources. 103 */ 104 void intel_gvt_cleanup(struct drm_i915_private *dev_priv) 105 { 106 if (!intel_gvt_active(dev_priv)) 107 return; 108 109 intel_gvt_clean_device(dev_priv); 110 } 111