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. This file provides the englightments 35 * of GVT and the necessary components used by GVT in i915 driver. 36 */ 37 38 static bool is_supported_device(struct drm_i915_private *dev_priv) 39 { 40 if (IS_BROADWELL(dev_priv)) 41 return true; 42 return false; 43 } 44 45 /** 46 * intel_gvt_init - initialize GVT components 47 * @dev_priv: drm i915 private data 48 * 49 * This function is called at the initialization stage to create a GVT device. 50 * 51 * Returns: 52 * Zero on success, negative error code if failed. 53 * 54 */ 55 int intel_gvt_init(struct drm_i915_private *dev_priv) 56 { 57 int ret; 58 59 if (!i915.enable_gvt) { 60 DRM_DEBUG_DRIVER("GVT-g is disabled by kernel params\n"); 61 return 0; 62 } 63 64 if (!is_supported_device(dev_priv)) { 65 DRM_DEBUG_DRIVER("Unsupported device. GVT-g is disabled\n"); 66 goto bail; 67 } 68 69 /* 70 * We're not in host or fail to find a MPT module, disable GVT-g 71 */ 72 ret = intel_gvt_init_host(); 73 if (ret) { 74 DRM_DEBUG_DRIVER("Not in host or MPT modules not found\n"); 75 goto bail; 76 } 77 78 ret = intel_gvt_init_device(dev_priv); 79 if (ret) { 80 DRM_DEBUG_DRIVER("Fail to init GVT device\n"); 81 goto bail; 82 } 83 84 return 0; 85 86 bail: 87 i915.enable_gvt = 0; 88 return 0; 89 } 90 91 /** 92 * intel_gvt_cleanup - cleanup GVT components when i915 driver is unloading 93 * @dev_priv: drm i915 private * 94 * 95 * This function is called at the i915 driver unloading stage, to shutdown 96 * GVT components and release the related resources. 97 */ 98 void intel_gvt_cleanup(struct drm_i915_private *dev_priv) 99 { 100 if (!intel_gvt_active(dev_priv)) 101 return; 102 103 intel_gvt_clean_device(dev_priv); 104 } 105