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0ad35fed ZW |
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 | |
22681c7b ZW |
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. | |
0ad35fed ZW |
40 | */ |
41 | ||
42 | static bool is_supported_device(struct drm_i915_private *dev_priv) | |
43 | { | |
44 | if (IS_BROADWELL(dev_priv)) | |
45 | return true; | |
21196a81 ZW |
46 | if (IS_SKYLAKE(dev_priv)) |
47 | return true; | |
0ad35fed ZW |
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 | ||
26f837e8 ZW |
70 | if (intel_vgpu_active(dev_priv)) { |
71 | DRM_DEBUG_DRIVER("GVT-g is disabled for guest\n"); | |
72 | goto bail; | |
73 | } | |
74 | ||
0ad35fed ZW |
75 | if (!is_supported_device(dev_priv)) { |
76 | DRM_DEBUG_DRIVER("Unsupported device. GVT-g is disabled\n"); | |
7822492f | 77 | goto bail; |
0ad35fed ZW |
78 | } |
79 | ||
cf2135ca CD |
80 | if (!i915.enable_execlists) { |
81 | DRM_INFO("GPU guest virtualisation [GVT-g] disabled due to disabled execlist submission [i915.enable_execlists module parameter]\n"); | |
82 | goto bail; | |
83 | } | |
84 | ||
0ad35fed ZW |
85 | /* |
86 | * We're not in host or fail to find a MPT module, disable GVT-g | |
87 | */ | |
88 | ret = intel_gvt_init_host(); | |
89 | if (ret) { | |
90 | DRM_DEBUG_DRIVER("Not in host or MPT modules not found\n"); | |
7822492f | 91 | goto bail; |
0ad35fed ZW |
92 | } |
93 | ||
94 | ret = intel_gvt_init_device(dev_priv); | |
95 | if (ret) { | |
96 | DRM_DEBUG_DRIVER("Fail to init GVT device\n"); | |
7822492f | 97 | goto bail; |
0ad35fed ZW |
98 | } |
99 | ||
100 | return 0; | |
7822492f CW |
101 | |
102 | bail: | |
103 | i915.enable_gvt = 0; | |
104 | return 0; | |
0ad35fed ZW |
105 | } |
106 | ||
107 | /** | |
108 | * intel_gvt_cleanup - cleanup GVT components when i915 driver is unloading | |
109 | * @dev_priv: drm i915 private * | |
110 | * | |
111 | * This function is called at the i915 driver unloading stage, to shutdown | |
112 | * GVT components and release the related resources. | |
113 | */ | |
114 | void intel_gvt_cleanup(struct drm_i915_private *dev_priv) | |
115 | { | |
116 | if (!intel_gvt_active(dev_priv)) | |
117 | return; | |
118 | ||
119 | intel_gvt_clean_device(dev_priv); | |
120 | } |