1 /* $NetBSD: intel_gvt.c,v 1.2 2021/12/18 23:45:28 riastradh Exp $ */
2
3 /*
4 * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: intel_gvt.c,v 1.2 2021/12/18 23:45:28 riastradh Exp $");
28
29 #include "i915_drv.h"
30 #include "intel_gvt.h"
31
32 /**
33 * DOC: Intel GVT-g host support
34 *
35 * Intel GVT-g is a graphics virtualization technology which shares the
36 * GPU among multiple virtual machines on a time-sharing basis. Each
37 * virtual machine is presented a virtual GPU (vGPU), which has equivalent
38 * features as the underlying physical GPU (pGPU), so i915 driver can run
39 * seamlessly in a virtual machine.
40 *
41 * To virtualize GPU resources GVT-g driver depends on hypervisor technology
42 * e.g KVM/VFIO/mdev, Xen, etc. to provide resource access trapping capability
43 * and be virtualized within GVT-g device module. More architectural design
44 * doc is available on https://01.org/group/2230/documentation-list.
45 */
46
is_supported_device(struct drm_i915_private * dev_priv)47 static bool is_supported_device(struct drm_i915_private *dev_priv)
48 {
49 if (IS_BROADWELL(dev_priv))
50 return true;
51 if (IS_SKYLAKE(dev_priv))
52 return true;
53 if (IS_KABYLAKE(dev_priv))
54 return true;
55 if (IS_BROXTON(dev_priv))
56 return true;
57 if (IS_COFFEELAKE(dev_priv))
58 return true;
59
60 return false;
61 }
62
63 /**
64 * intel_gvt_sanitize_options - sanitize GVT related options
65 * @dev_priv: drm i915 private data
66 *
67 * This function is called at the i915 options sanitize stage.
68 */
intel_gvt_sanitize_options(struct drm_i915_private * dev_priv)69 void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv)
70 {
71 if (!i915_modparams.enable_gvt)
72 return;
73
74 if (intel_vgpu_active(dev_priv)) {
75 DRM_INFO("GVT-g is disabled for guest\n");
76 goto bail;
77 }
78
79 if (!is_supported_device(dev_priv)) {
80 DRM_INFO("Unsupported device. GVT-g is disabled\n");
81 goto bail;
82 }
83
84 return;
85 bail:
86 i915_modparams.enable_gvt = 0;
87 }
88
89 /**
90 * intel_gvt_init - initialize GVT components
91 * @dev_priv: drm i915 private data
92 *
93 * This function is called at the initialization stage to create a GVT device.
94 *
95 * Returns:
96 * Zero on success, negative error code if failed.
97 *
98 */
intel_gvt_init(struct drm_i915_private * dev_priv)99 int intel_gvt_init(struct drm_i915_private *dev_priv)
100 {
101 int ret;
102
103 if (i915_inject_probe_failure(dev_priv))
104 return -ENODEV;
105
106 if (!i915_modparams.enable_gvt) {
107 DRM_DEBUG_DRIVER("GVT-g is disabled by kernel params\n");
108 return 0;
109 }
110
111 if (USES_GUC_SUBMISSION(dev_priv)) {
112 DRM_ERROR("i915 GVT-g loading failed due to Graphics virtualization is not yet supported with GuC submission\n");
113 return -EIO;
114 }
115
116 ret = intel_gvt_init_device(dev_priv);
117 if (ret) {
118 DRM_DEBUG_DRIVER("Fail to init GVT device\n");
119 goto bail;
120 }
121
122 return 0;
123
124 bail:
125 i915_modparams.enable_gvt = 0;
126 return 0;
127 }
128
129 /**
130 * intel_gvt_driver_remove - cleanup GVT components when i915 driver is
131 * unbinding
132 * @dev_priv: drm i915 private *
133 *
134 * This function is called at the i915 driver unloading stage, to shutdown
135 * GVT components and release the related resources.
136 */
intel_gvt_driver_remove(struct drm_i915_private * dev_priv)137 void intel_gvt_driver_remove(struct drm_i915_private *dev_priv)
138 {
139 if (!intel_gvt_active(dev_priv))
140 return;
141
142 intel_gvt_clean_device(dev_priv);
143 }
144