intel_gvt.c revision 1.1 
1/*	$NetBSD: intel_gvt.c,v 1.1 2021/12/18 20:15:26 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 1.1 2021/12/18 20:15:26 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
47static 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 */
69void 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;
85bail:
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 */
99int 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
124bail:
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 */
137void 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