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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.
22 */
23
24#include "i915_drv.h"
25#include "i915_vgpu.h"
26#include "intel_gvt.h"
27#include "gem/i915_gem_dmabuf.h"
28#include "gt/intel_context.h"
29#include "gt/intel_ring.h"
30#include "gt/shmem_utils.h"
31#include <linux/vmalloc.h>
32
33/**
34 * DOC: Intel GVT-g host support
35 *
36 * Intel GVT-g is a graphics virtualization technology which shares the
37 * GPU among multiple virtual machines on a time-sharing basis. Each
38 * virtual machine is presented a virtual GPU (vGPU), which has equivalent
39 * features as the underlying physical GPU (pGPU), so i915 driver can run
40 * seamlessly in a virtual machine.
41 *
42 * To virtualize GPU resources GVT-g driver depends on hypervisor technology
43 * e.g KVM/VFIO/mdev, Xen, etc. to provide resource access trapping capability
44 * and be virtualized within GVT-g device module. More architectural design
45 * doc is available on https://github.com/intel/gvt-linux/wiki.
46 */
47
48static LIST_HEAD(intel_gvt_devices);
49static const struct intel_vgpu_ops *intel_gvt_ops;
50static DEFINE_MUTEX(intel_gvt_mutex);
51
52static bool is_supported_device(struct drm_i915_private *dev_priv)
53{
54 if (IS_BROADWELL(dev_priv))
55 return true;
56 if (IS_SKYLAKE(dev_priv))
57 return true;
58 if (IS_KABYLAKE(dev_priv))
59 return true;
60 if (IS_BROXTON(dev_priv))
61 return true;
62 if (IS_COFFEELAKE(dev_priv))
63 return true;
64 if (IS_COMETLAKE(dev_priv))
65 return true;
66
67 return false;
68}
69
70static void free_initial_hw_state(struct drm_i915_private *dev_priv)
71{
72 struct i915_virtual_gpu *vgpu = &dev_priv->vgpu;
73
74 vfree(vgpu->initial_mmio);
75 vgpu->initial_mmio = NULL;
76
77 kfree(vgpu->initial_cfg_space);
78 vgpu->initial_cfg_space = NULL;
79}
80
81static void save_mmio(struct intel_gvt_mmio_table_iter *iter, u32 offset,
82 u32 size)
83{
84 struct drm_i915_private *dev_priv = iter->i915;
85 u32 *mmio, i;
86
87 for (i = offset; i < offset + size; i += 4) {
88 mmio = iter->data + i;
89 *mmio = intel_uncore_read_notrace(to_gt(dev_priv)->uncore,
90 _MMIO(i));
91 }
92}
93
94static int handle_mmio(struct intel_gvt_mmio_table_iter *iter,
95 u32 offset, u32 size)
96{
97 if (WARN_ON(!IS_ALIGNED(offset, 4)))
98 return -EINVAL;
99
100 save_mmio(iter, offset, size);
101 return 0;
102}
103
104static int save_initial_hw_state(struct drm_i915_private *dev_priv)
105{
106 struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
107 struct i915_virtual_gpu *vgpu = &dev_priv->vgpu;
108 struct intel_gvt_mmio_table_iter iter;
109 void *mem;
110 int i, ret;
111
112 mem = kzalloc(PCI_CFG_SPACE_EXP_SIZE, GFP_KERNEL);
113 if (!mem)
114 return -ENOMEM;
115
116 vgpu->initial_cfg_space = mem;
117
118 for (i = 0; i < PCI_CFG_SPACE_EXP_SIZE; i += 4)
119 pci_read_config_dword(pdev, i, mem + i);
120
121 mem = vzalloc(2 * SZ_1M);
122 if (!mem) {
123 ret = -ENOMEM;
124 goto err_mmio;
125 }
126
127 vgpu->initial_mmio = mem;
128
129 iter.i915 = dev_priv;
130 iter.data = vgpu->initial_mmio;
131 iter.handle_mmio_cb = handle_mmio;
132
133 ret = intel_gvt_iterate_mmio_table(&iter);
134 if (ret)
135 goto err_iterate;
136
137 return 0;
138
139err_iterate:
140 vfree(vgpu->initial_mmio);
141 vgpu->initial_mmio = NULL;
142err_mmio:
143 kfree(vgpu->initial_cfg_space);
144 vgpu->initial_cfg_space = NULL;
145
146 return ret;
147}
148
149static void intel_gvt_init_device(struct drm_i915_private *dev_priv)
150{
151 if (!dev_priv->params.enable_gvt) {
152 drm_dbg(&dev_priv->drm,
153 "GVT-g is disabled by kernel params\n");
154 return;
155 }
156
157 if (intel_vgpu_active(dev_priv)) {
158 drm_info(&dev_priv->drm, "GVT-g is disabled for guest\n");
159 return;
160 }
161
162 if (!is_supported_device(dev_priv)) {
163 drm_info(&dev_priv->drm,
164 "Unsupported device. GVT-g is disabled\n");
165 return;
166 }
167
168 if (intel_uc_wants_guc_submission(&to_gt(dev_priv)->uc)) {
169 drm_err(&dev_priv->drm,
170 "Graphics virtualization is not yet supported with GuC submission\n");
171 return;
172 }
173
174 if (save_initial_hw_state(dev_priv)) {
175 drm_dbg(&dev_priv->drm, "Failed to save initial HW state\n");
176 return;
177 }
178
179 if (intel_gvt_ops->init_device(dev_priv))
180 drm_dbg(&dev_priv->drm, "Fail to init GVT device\n");
181}
182
183static void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
184{
185 if (dev_priv->gvt)
186 intel_gvt_ops->clean_device(dev_priv);
187 free_initial_hw_state(dev_priv);
188}
189
190int intel_gvt_set_ops(const struct intel_vgpu_ops *ops)
191{
192 struct drm_i915_private *dev_priv;
193
194 mutex_lock(&intel_gvt_mutex);
195 if (intel_gvt_ops) {
196 mutex_unlock(&intel_gvt_mutex);
197 return -EINVAL;
198 }
199 intel_gvt_ops = ops;
200
201 list_for_each_entry(dev_priv, &intel_gvt_devices, vgpu.entry)
202 intel_gvt_init_device(dev_priv);
203 mutex_unlock(&intel_gvt_mutex);
204
205 return 0;
206}
207EXPORT_SYMBOL_NS_GPL(intel_gvt_set_ops, "I915_GVT");
208
209void intel_gvt_clear_ops(const struct intel_vgpu_ops *ops)
210{
211 struct drm_i915_private *dev_priv;
212
213 mutex_lock(&intel_gvt_mutex);
214 if (intel_gvt_ops != ops) {
215 mutex_unlock(&intel_gvt_mutex);
216 return;
217 }
218
219 list_for_each_entry(dev_priv, &intel_gvt_devices, vgpu.entry)
220 intel_gvt_clean_device(dev_priv);
221
222 intel_gvt_ops = NULL;
223 mutex_unlock(&intel_gvt_mutex);
224}
225EXPORT_SYMBOL_NS_GPL(intel_gvt_clear_ops, "I915_GVT");
226
227/**
228 * intel_gvt_init - initialize GVT components
229 * @dev_priv: drm i915 private data
230 *
231 * This function is called at the initialization stage to create a GVT device.
232 *
233 * Returns:
234 * Zero on success, negative error code if failed.
235 *
236 */
237int intel_gvt_init(struct drm_i915_private *dev_priv)
238{
239 if (i915_inject_probe_failure(dev_priv))
240 return -ENODEV;
241
242 mutex_lock(&intel_gvt_mutex);
243 list_add_tail(&dev_priv->vgpu.entry, &intel_gvt_devices);
244 if (intel_gvt_ops)
245 intel_gvt_init_device(dev_priv);
246 mutex_unlock(&intel_gvt_mutex);
247
248 return 0;
249}
250
251/**
252 * intel_gvt_driver_remove - cleanup GVT components when i915 driver is
253 * unbinding
254 * @dev_priv: drm i915 private *
255 *
256 * This function is called at the i915 driver unloading stage, to shutdown
257 * GVT components and release the related resources.
258 */
259void intel_gvt_driver_remove(struct drm_i915_private *dev_priv)
260{
261 mutex_lock(&intel_gvt_mutex);
262 intel_gvt_clean_device(dev_priv);
263 list_del(&dev_priv->vgpu.entry);
264 mutex_unlock(&intel_gvt_mutex);
265}
266
267/**
268 * intel_gvt_resume - GVT resume routine wapper
269 *
270 * @dev_priv: drm i915 private *
271 *
272 * This function is called at the i915 driver resume stage to restore required
273 * HW status for GVT so that vGPU can continue running after resumed.
274 */
275void intel_gvt_resume(struct drm_i915_private *dev_priv)
276{
277 mutex_lock(&intel_gvt_mutex);
278 if (dev_priv->gvt)
279 intel_gvt_ops->pm_resume(dev_priv);
280 mutex_unlock(&intel_gvt_mutex);
281}
282
283/*
284 * Exported here so that the exports only get created when GVT support is
285 * actually enabled.
286 */
287EXPORT_SYMBOL_NS_GPL(i915_gem_object_alloc, "I915_GVT");
288EXPORT_SYMBOL_NS_GPL(i915_gem_object_create_shmem, "I915_GVT");
289EXPORT_SYMBOL_NS_GPL(i915_gem_object_init, "I915_GVT");
290EXPORT_SYMBOL_NS_GPL(i915_gem_object_ggtt_pin_ww, "I915_GVT");
291EXPORT_SYMBOL_NS_GPL(i915_gem_object_pin_map, "I915_GVT");
292EXPORT_SYMBOL_NS_GPL(i915_gem_object_set_to_cpu_domain, "I915_GVT");
293EXPORT_SYMBOL_NS_GPL(__i915_gem_object_flush_map, "I915_GVT");
294EXPORT_SYMBOL_NS_GPL(__i915_gem_object_set_pages, "I915_GVT");
295EXPORT_SYMBOL_NS_GPL(i915_gem_gtt_insert, "I915_GVT");
296EXPORT_SYMBOL_NS_GPL(i915_gem_prime_export, "I915_GVT");
297EXPORT_SYMBOL_NS_GPL(i915_gem_ww_ctx_init, "I915_GVT");
298EXPORT_SYMBOL_NS_GPL(i915_gem_ww_ctx_backoff, "I915_GVT");
299EXPORT_SYMBOL_NS_GPL(i915_gem_ww_ctx_fini, "I915_GVT");
300EXPORT_SYMBOL_NS_GPL(i915_ppgtt_create, "I915_GVT");
301EXPORT_SYMBOL_NS_GPL(i915_request_add, "I915_GVT");
302EXPORT_SYMBOL_NS_GPL(i915_request_create, "I915_GVT");
303EXPORT_SYMBOL_NS_GPL(i915_request_wait, "I915_GVT");
304EXPORT_SYMBOL_NS_GPL(i915_reserve_fence, "I915_GVT");
305EXPORT_SYMBOL_NS_GPL(i915_unreserve_fence, "I915_GVT");
306EXPORT_SYMBOL_NS_GPL(i915_vm_release, "I915_GVT");
307EXPORT_SYMBOL_NS_GPL(_i915_vma_move_to_active, "I915_GVT");
308EXPORT_SYMBOL_NS_GPL(intel_context_create, "I915_GVT");
309EXPORT_SYMBOL_NS_GPL(__intel_context_do_pin, "I915_GVT");
310EXPORT_SYMBOL_NS_GPL(__intel_context_do_unpin, "I915_GVT");
311EXPORT_SYMBOL_NS_GPL(intel_ring_begin, "I915_GVT");
312EXPORT_SYMBOL_NS_GPL(intel_runtime_pm_get, "I915_GVT");
313#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)
314EXPORT_SYMBOL_NS_GPL(intel_runtime_pm_put, "I915_GVT");
315#endif
316EXPORT_SYMBOL_NS_GPL(intel_runtime_pm_put_unchecked, "I915_GVT");
317EXPORT_SYMBOL_NS_GPL(intel_uncore_forcewake_for_reg, "I915_GVT");
318EXPORT_SYMBOL_NS_GPL(intel_uncore_forcewake_get, "I915_GVT");
319EXPORT_SYMBOL_NS_GPL(intel_uncore_forcewake_put, "I915_GVT");
320EXPORT_SYMBOL_NS_GPL(shmem_pin_map, "I915_GVT");
321EXPORT_SYMBOL_NS_GPL(shmem_unpin_map, "I915_GVT");
322EXPORT_SYMBOL_NS_GPL(__px_dma, "I915_GVT");
323EXPORT_SYMBOL_NS_GPL(i915_fence_ops, "I915_GVT");
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#include "gvt/gvt.h"
28
29/**
30 * DOC: Intel GVT-g host support
31 *
32 * Intel GVT-g is a graphics virtualization technology which shares the
33 * GPU among multiple virtual machines on a time-sharing basis. Each
34 * virtual machine is presented a virtual GPU (vGPU), which has equivalent
35 * features as the underlying physical GPU (pGPU), so i915 driver can run
36 * seamlessly in a virtual machine.
37 *
38 * To virtualize GPU resources GVT-g driver depends on hypervisor technology
39 * e.g KVM/VFIO/mdev, Xen, etc. to provide resource access trapping capability
40 * and be virtualized within GVT-g device module. More architectural design
41 * doc is available on https://01.org/group/2230/documentation-list.
42 */
43
44static bool is_supported_device(struct drm_i915_private *dev_priv)
45{
46 if (IS_BROADWELL(dev_priv))
47 return true;
48 if (IS_SKYLAKE(dev_priv))
49 return true;
50 if (IS_KABYLAKE(dev_priv))
51 return true;
52 if (IS_BROXTON(dev_priv))
53 return true;
54 if (IS_COFFEELAKE(dev_priv))
55 return true;
56 if (IS_COMETLAKE(dev_priv))
57 return true;
58
59 return false;
60}
61
62/**
63 * intel_gvt_sanitize_options - sanitize GVT related options
64 * @dev_priv: drm i915 private data
65 *
66 * This function is called at the i915 options sanitize stage.
67 */
68void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv)
69{
70 if (!dev_priv->params.enable_gvt)
71 return;
72
73 if (intel_vgpu_active(dev_priv)) {
74 drm_info(&dev_priv->drm, "GVT-g is disabled for guest\n");
75 goto bail;
76 }
77
78 if (!is_supported_device(dev_priv)) {
79 drm_info(&dev_priv->drm,
80 "Unsupported device. GVT-g is disabled\n");
81 goto bail;
82 }
83
84 return;
85bail:
86 dev_priv->params.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 (!dev_priv->params.enable_gvt) {
107 drm_dbg(&dev_priv->drm,
108 "GVT-g is disabled by kernel params\n");
109 return 0;
110 }
111
112 if (intel_uc_wants_guc_submission(&dev_priv->gt.uc)) {
113 drm_err(&dev_priv->drm,
114 "i915 GVT-g loading failed due to Graphics virtualization is not yet supported with GuC submission\n");
115 return -EIO;
116 }
117
118 ret = intel_gvt_init_device(dev_priv);
119 if (ret) {
120 drm_dbg(&dev_priv->drm, "Fail to init GVT device\n");
121 goto bail;
122 }
123
124 return 0;
125
126bail:
127 dev_priv->params.enable_gvt = 0;
128 return 0;
129}
130
131static inline bool intel_gvt_active(struct drm_i915_private *dev_priv)
132{
133 return dev_priv->gvt;
134}
135
136/**
137 * intel_gvt_driver_remove - cleanup GVT components when i915 driver is
138 * unbinding
139 * @dev_priv: drm i915 private *
140 *
141 * This function is called at the i915 driver unloading stage, to shutdown
142 * GVT components and release the related resources.
143 */
144void intel_gvt_driver_remove(struct drm_i915_private *dev_priv)
145{
146 if (!intel_gvt_active(dev_priv))
147 return;
148
149 intel_gvt_clean_device(dev_priv);
150}
151
152/**
153 * intel_gvt_resume - GVT resume routine wapper
154 *
155 * @dev_priv: drm i915 private *
156 *
157 * This function is called at the i915 driver resume stage to restore required
158 * HW status for GVT so that vGPU can continue running after resumed.
159 */
160void intel_gvt_resume(struct drm_i915_private *dev_priv)
161{
162 if (intel_gvt_active(dev_priv))
163 intel_gvt_pm_resume(dev_priv->gvt);
164}