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
is_supported_device(struct drm_i915_private * dev_priv)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 */
intel_gvt_sanitize_options(struct drm_i915_private * dev_priv)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 */
intel_gvt_init(struct drm_i915_private * dev_priv)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
intel_gvt_active(struct drm_i915_private * dev_priv)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 */
intel_gvt_driver_remove(struct drm_i915_private * dev_priv)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