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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.
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22 *
23 * Authors:
24 * Kevin Tian <kevin.tian@intel.com>
25 * Eddie Dong <eddie.dong@intel.com>
26 *
27 * Contributors:
28 * Niu Bing <bing.niu@intel.com>
29 * Zhi Wang <zhi.a.wang@intel.com>
30 *
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31 */
32
33#include <linux/types.h>
34#include <xen/xen.h>
04d348ae 35#include <linux/kthread.h>
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36
37#include "i915_drv.h"
feddf6e8 38#include "gvt.h"
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39
40struct intel_gvt_host intel_gvt_host;
41
42static const char * const supported_hypervisors[] = {
43 [INTEL_GVT_HYPERVISOR_XEN] = "XEN",
44 [INTEL_GVT_HYPERVISOR_KVM] = "KVM",
45};
46
9ec1e66b 47static const struct intel_gvt_ops intel_gvt_ops = {
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48 .emulate_cfg_read = intel_vgpu_emulate_cfg_read,
49 .emulate_cfg_write = intel_vgpu_emulate_cfg_write,
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50 .emulate_mmio_read = intel_vgpu_emulate_mmio_read,
51 .emulate_mmio_write = intel_vgpu_emulate_mmio_write,
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52 .vgpu_create = intel_gvt_create_vgpu,
53 .vgpu_destroy = intel_gvt_destroy_vgpu,
54 .vgpu_reset = intel_gvt_reset_vgpu,
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55 .vgpu_activate = intel_gvt_activate_vgpu,
56 .vgpu_deactivate = intel_gvt_deactivate_vgpu,
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57};
58
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59/**
60 * intel_gvt_init_host - Load MPT modules and detect if we're running in host
61 * @gvt: intel gvt device
62 *
63 * This function is called at the driver loading stage. If failed to find a
64 * loadable MPT module or detect currently we're running in a VM, then GVT-g
65 * will be disabled
66 *
67 * Returns:
68 * Zero on success, negative error code if failed.
69 *
70 */
71int intel_gvt_init_host(void)
72{
73 if (intel_gvt_host.initialized)
74 return 0;
75
76 /* Xen DOM U */
77 if (xen_domain() && !xen_initial_domain())
78 return -ENODEV;
79
80 /* Try to load MPT modules for hypervisors */
81 if (xen_initial_domain()) {
82 /* In Xen dom0 */
83 intel_gvt_host.mpt = try_then_request_module(
84 symbol_get(xengt_mpt), "xengt");
85 intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_XEN;
86 } else {
f30437c5 87#if IS_ENABLED(CONFIG_DRM_I915_GVT_KVMGT)
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88 /* not in Xen. Try KVMGT */
89 intel_gvt_host.mpt = try_then_request_module(
f30437c5 90 symbol_get(kvmgt_mpt), "kvmgt");
0ad35fed 91 intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_KVM;
f30437c5 92#endif
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93 }
94
95 /* Fail to load MPT modules - bail out */
96 if (!intel_gvt_host.mpt)
97 return -EINVAL;
98
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99 gvt_dbg_core("Running with hypervisor %s in host mode\n",
100 supported_hypervisors[intel_gvt_host.hypervisor_type]);
101
102 intel_gvt_host.initialized = true;
103 return 0;
104}
105
106static void init_device_info(struct intel_gvt *gvt)
107{
12d14cc4 108 struct intel_gvt_device_info *info = &gvt->device_info;
49129204 109 struct pci_dev *pdev = gvt->dev_priv->drm.pdev;
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110
111 if (IS_BROADWELL(gvt->dev_priv) || IS_SKYLAKE(gvt->dev_priv)) {
112 info->max_support_vgpus = 8;
579cea5f 113 info->cfg_space_size = 256;
c8fe6a68 114 info->mmio_size = 2 * 1024 * 1024;
579cea5f 115 info->mmio_bar = 0;
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116 info->gtt_start_offset = 8 * 1024 * 1024;
117 info->gtt_entry_size = 8;
118 info->gtt_entry_size_shift = 3;
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119 info->gmadr_bytes_in_cmd = 8;
120 info->max_surface_size = 36 * 1024 * 1024;
12d14cc4 121 }
49129204 122 info->msi_cap_offset = pdev->msi_cap;
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123}
124
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125static int gvt_service_thread(void *data)
126{
127 struct intel_gvt *gvt = (struct intel_gvt *)data;
128 int ret;
129
130 gvt_dbg_core("service thread start\n");
131
132 while (!kthread_should_stop()) {
133 ret = wait_event_interruptible(gvt->service_thread_wq,
134 kthread_should_stop() || gvt->service_request);
135
136 if (kthread_should_stop())
137 break;
138
139 if (WARN_ONCE(ret, "service thread is waken up by signal.\n"))
140 continue;
141
142 if (test_and_clear_bit(INTEL_GVT_REQUEST_EMULATE_VBLANK,
143 (void *)&gvt->service_request)) {
144 mutex_lock(&gvt->lock);
145 intel_gvt_emulate_vblank(gvt);
146 mutex_unlock(&gvt->lock);
147 }
148 }
149
150 return 0;
151}
152
153static void clean_service_thread(struct intel_gvt *gvt)
154{
155 kthread_stop(gvt->service_thread);
156}
157
158static int init_service_thread(struct intel_gvt *gvt)
159{
160 init_waitqueue_head(&gvt->service_thread_wq);
161
162 gvt->service_thread = kthread_run(gvt_service_thread,
163 gvt, "gvt_service_thread");
164 if (IS_ERR(gvt->service_thread)) {
165 gvt_err("fail to start service thread.\n");
166 return PTR_ERR(gvt->service_thread);
167 }
168 return 0;
169}
170
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171/**
172 * intel_gvt_clean_device - clean a GVT device
173 * @gvt: intel gvt device
174 *
175 * This function is called at the driver unloading stage, to free the
176 * resources owned by a GVT device.
177 *
178 */
179void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
180{
feddf6e8 181 struct intel_gvt *gvt = to_gvt(dev_priv);
0ad35fed 182
feddf6e8 183 if (WARN_ON(!gvt))
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184 return;
185
04d348ae 186 clean_service_thread(gvt);
be1da707 187 intel_gvt_clean_cmd_parser(gvt);
4b63960e 188 intel_gvt_clean_sched_policy(gvt);
e4734057 189 intel_gvt_clean_workload_scheduler(gvt);
4d60c5fd 190 intel_gvt_clean_opregion(gvt);
2707e444 191 intel_gvt_clean_gtt(gvt);
c8fe6a68 192 intel_gvt_clean_irq(gvt);
12d14cc4 193 intel_gvt_clean_mmio_info(gvt);
579cea5f 194 intel_gvt_free_firmware(gvt);
0ad35fed 195
40df6ea0 196 intel_gvt_hypervisor_host_exit(&dev_priv->drm.pdev->dev, gvt);
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197 intel_gvt_clean_vgpu_types(gvt);
198
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199 idr_destroy(&gvt->vgpu_idr);
200
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201 kfree(dev_priv->gvt);
202 dev_priv->gvt = NULL;
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203}
204
205/**
206 * intel_gvt_init_device - initialize a GVT device
207 * @dev_priv: drm i915 private data
208 *
209 * This function is called at the initialization stage, to initialize
210 * necessary GVT components.
211 *
212 * Returns:
213 * Zero on success, negative error code if failed.
214 *
215 */
216int intel_gvt_init_device(struct drm_i915_private *dev_priv)
217{
feddf6e8 218 struct intel_gvt *gvt;
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219 int ret;
220
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221 /*
222 * Cannot initialize GVT device without intel_gvt_host gets
223 * initialized first.
224 */
225 if (WARN_ON(!intel_gvt_host.initialized))
226 return -EINVAL;
227
feddf6e8 228 if (WARN_ON(dev_priv->gvt))
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229 return -EEXIST;
230
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231 gvt = kzalloc(sizeof(struct intel_gvt), GFP_KERNEL);
232 if (!gvt)
233 return -ENOMEM;
234
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235 gvt_dbg_core("init gvt device\n");
236
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237 idr_init(&gvt->vgpu_idr);
238
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239 mutex_init(&gvt->lock);
240 gvt->dev_priv = dev_priv;
241
0ad35fed 242 init_device_info(gvt);
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243
244 ret = intel_gvt_setup_mmio_info(gvt);
245 if (ret)
59c0573d 246 goto out_clean_idr;
12d14cc4 247
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248 ret = intel_gvt_load_firmware(gvt);
249 if (ret)
250 goto out_clean_mmio_info;
251
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252 ret = intel_gvt_init_irq(gvt);
253 if (ret)
254 goto out_free_firmware;
255
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256 ret = intel_gvt_init_gtt(gvt);
257 if (ret)
258 goto out_clean_irq;
259
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260 ret = intel_gvt_init_opregion(gvt);
261 if (ret)
262 goto out_clean_gtt;
263
e4734057 264 ret = intel_gvt_init_workload_scheduler(gvt);
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265 if (ret)
266 goto out_clean_opregion;
267
4b63960e 268 ret = intel_gvt_init_sched_policy(gvt);
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269 if (ret)
270 goto out_clean_workload_scheduler;
271
be1da707 272 ret = intel_gvt_init_cmd_parser(gvt);
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273 if (ret)
274 goto out_clean_sched_policy;
275
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276 ret = init_service_thread(gvt);
277 if (ret)
278 goto out_clean_cmd_parser;
279
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280 ret = intel_gvt_init_vgpu_types(gvt);
281 if (ret)
282 goto out_clean_thread;
283
40df6ea0 284 ret = intel_gvt_hypervisor_host_init(&dev_priv->drm.pdev->dev, gvt,
9ec1e66b 285 &intel_gvt_ops);
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286 if (ret) {
287 gvt_err("failed to register gvt-g host device: %d\n", ret);
288 goto out_clean_types;
289 }
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290
291 gvt_dbg_core("gvt device initialization is done\n");
feddf6e8 292 dev_priv->gvt = gvt;
0ad35fed 293 return 0;
579cea5f 294
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295out_clean_types:
296 intel_gvt_clean_vgpu_types(gvt);
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297out_clean_thread:
298 clean_service_thread(gvt);
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299out_clean_cmd_parser:
300 intel_gvt_clean_cmd_parser(gvt);
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301out_clean_sched_policy:
302 intel_gvt_clean_sched_policy(gvt);
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303out_clean_workload_scheduler:
304 intel_gvt_clean_workload_scheduler(gvt);
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305out_clean_opregion:
306 intel_gvt_clean_opregion(gvt);
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307out_clean_gtt:
308 intel_gvt_clean_gtt(gvt);
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309out_clean_irq:
310 intel_gvt_clean_irq(gvt);
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311out_free_firmware:
312 intel_gvt_free_firmware(gvt);
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313out_clean_mmio_info:
314 intel_gvt_clean_mmio_info(gvt);
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315out_clean_idr:
316 idr_destroy(&gvt->vgpu_idr);
feddf6e8 317 kfree(gvt);
579cea5f 318 return ret;
0ad35fed 319}