xref: /openbmc/linux/drivers/gpu/drm/i915/intel_gvt.c (revision 5b95b9d5)
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 
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 
47 static LIST_HEAD(intel_gvt_devices);
48 static const struct intel_vgpu_ops *intel_gvt_ops;
49 static DEFINE_MUTEX(intel_gvt_mutex);
50 
is_supported_device(struct drm_i915_private * dev_priv)51 static bool is_supported_device(struct drm_i915_private *dev_priv)
52 {
53 	if (IS_BROADWELL(dev_priv))
54 		return true;
55 	if (IS_SKYLAKE(dev_priv))
56 		return true;
57 	if (IS_KABYLAKE(dev_priv))
58 		return true;
59 	if (IS_BROXTON(dev_priv))
60 		return true;
61 	if (IS_COFFEELAKE(dev_priv))
62 		return true;
63 	if (IS_COMETLAKE(dev_priv))
64 		return true;
65 
66 	return false;
67 }
68 
free_initial_hw_state(struct drm_i915_private * dev_priv)69 static void free_initial_hw_state(struct drm_i915_private *dev_priv)
70 {
71 	struct i915_virtual_gpu *vgpu = &dev_priv->vgpu;
72 
73 	vfree(vgpu->initial_mmio);
74 	vgpu->initial_mmio = NULL;
75 
76 	kfree(vgpu->initial_cfg_space);
77 	vgpu->initial_cfg_space = NULL;
78 }
79 
save_mmio(struct intel_gvt_mmio_table_iter * iter,u32 offset,u32 size)80 static void save_mmio(struct intel_gvt_mmio_table_iter *iter, u32 offset,
81 		      u32 size)
82 {
83 	struct drm_i915_private *dev_priv = iter->i915;
84 	u32 *mmio, i;
85 
86 	for (i = offset; i < offset + size; i += 4) {
87 		mmio = iter->data + i;
88 		*mmio = intel_uncore_read_notrace(to_gt(dev_priv)->uncore,
89 						  _MMIO(i));
90 	}
91 }
92 
handle_mmio(struct intel_gvt_mmio_table_iter * iter,u32 offset,u32 size)93 static int handle_mmio(struct intel_gvt_mmio_table_iter *iter,
94 		       u32 offset, u32 size)
95 {
96 	if (WARN_ON(!IS_ALIGNED(offset, 4)))
97 		return -EINVAL;
98 
99 	save_mmio(iter, offset, size);
100 	return 0;
101 }
102 
save_initial_hw_state(struct drm_i915_private * dev_priv)103 static int save_initial_hw_state(struct drm_i915_private *dev_priv)
104 {
105 	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
106 	struct i915_virtual_gpu *vgpu = &dev_priv->vgpu;
107 	struct intel_gvt_mmio_table_iter iter;
108 	void *mem;
109 	int i, ret;
110 
111 	mem = kzalloc(PCI_CFG_SPACE_EXP_SIZE, GFP_KERNEL);
112 	if (!mem)
113 		return -ENOMEM;
114 
115 	vgpu->initial_cfg_space = mem;
116 
117 	for (i = 0; i < PCI_CFG_SPACE_EXP_SIZE; i += 4)
118 		pci_read_config_dword(pdev, i, mem + i);
119 
120 	mem = vzalloc(2 * SZ_1M);
121 	if (!mem) {
122 		ret = -ENOMEM;
123 		goto err_mmio;
124 	}
125 
126 	vgpu->initial_mmio = mem;
127 
128 	iter.i915 = dev_priv;
129 	iter.data = vgpu->initial_mmio;
130 	iter.handle_mmio_cb = handle_mmio;
131 
132 	ret = intel_gvt_iterate_mmio_table(&iter);
133 	if (ret)
134 		goto err_iterate;
135 
136 	return 0;
137 
138 err_iterate:
139 	vfree(vgpu->initial_mmio);
140 	vgpu->initial_mmio = NULL;
141 err_mmio:
142 	kfree(vgpu->initial_cfg_space);
143 	vgpu->initial_cfg_space = NULL;
144 
145 	return ret;
146 }
147 
intel_gvt_init_device(struct drm_i915_private * dev_priv)148 static void intel_gvt_init_device(struct drm_i915_private *dev_priv)
149 {
150 	if (!dev_priv->params.enable_gvt) {
151 		drm_dbg(&dev_priv->drm,
152 			"GVT-g is disabled by kernel params\n");
153 		return;
154 	}
155 
156 	if (intel_vgpu_active(dev_priv)) {
157 		drm_info(&dev_priv->drm, "GVT-g is disabled for guest\n");
158 		return;
159 	}
160 
161 	if (!is_supported_device(dev_priv)) {
162 		drm_info(&dev_priv->drm,
163 			 "Unsupported device. GVT-g is disabled\n");
164 		return;
165 	}
166 
167 	if (intel_uc_wants_guc_submission(&to_gt(dev_priv)->uc)) {
168 		drm_err(&dev_priv->drm,
169 			"Graphics virtualization is not yet supported with GuC submission\n");
170 		return;
171 	}
172 
173 	if (save_initial_hw_state(dev_priv)) {
174 		drm_dbg(&dev_priv->drm, "Failed to save initial HW state\n");
175 		return;
176 	}
177 
178 	if (intel_gvt_ops->init_device(dev_priv))
179 		drm_dbg(&dev_priv->drm, "Fail to init GVT device\n");
180 }
181 
intel_gvt_clean_device(struct drm_i915_private * dev_priv)182 static void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
183 {
184 	if (dev_priv->gvt)
185 		intel_gvt_ops->clean_device(dev_priv);
186 	free_initial_hw_state(dev_priv);
187 }
188 
intel_gvt_set_ops(const struct intel_vgpu_ops * ops)189 int intel_gvt_set_ops(const struct intel_vgpu_ops *ops)
190 {
191 	struct drm_i915_private *dev_priv;
192 
193 	mutex_lock(&intel_gvt_mutex);
194 	if (intel_gvt_ops) {
195 		mutex_unlock(&intel_gvt_mutex);
196 		return -EINVAL;
197 	}
198 	intel_gvt_ops = ops;
199 
200 	list_for_each_entry(dev_priv, &intel_gvt_devices, vgpu.entry)
201 		intel_gvt_init_device(dev_priv);
202 	mutex_unlock(&intel_gvt_mutex);
203 
204 	return 0;
205 }
206 EXPORT_SYMBOL_NS_GPL(intel_gvt_set_ops, I915_GVT);
207 
intel_gvt_clear_ops(const struct intel_vgpu_ops * ops)208 void intel_gvt_clear_ops(const struct intel_vgpu_ops *ops)
209 {
210 	struct drm_i915_private *dev_priv;
211 
212 	mutex_lock(&intel_gvt_mutex);
213 	if (intel_gvt_ops != ops) {
214 		mutex_unlock(&intel_gvt_mutex);
215 		return;
216 	}
217 
218 	list_for_each_entry(dev_priv, &intel_gvt_devices, vgpu.entry)
219 		intel_gvt_clean_device(dev_priv);
220 
221 	intel_gvt_ops = NULL;
222 	mutex_unlock(&intel_gvt_mutex);
223 }
224 EXPORT_SYMBOL_NS_GPL(intel_gvt_clear_ops, I915_GVT);
225 
226 /**
227  * intel_gvt_init - initialize GVT components
228  * @dev_priv: drm i915 private data
229  *
230  * This function is called at the initialization stage to create a GVT device.
231  *
232  * Returns:
233  * Zero on success, negative error code if failed.
234  *
235  */
intel_gvt_init(struct drm_i915_private * dev_priv)236 int intel_gvt_init(struct drm_i915_private *dev_priv)
237 {
238 	if (i915_inject_probe_failure(dev_priv))
239 		return -ENODEV;
240 
241 	mutex_lock(&intel_gvt_mutex);
242 	list_add_tail(&dev_priv->vgpu.entry, &intel_gvt_devices);
243 	if (intel_gvt_ops)
244 		intel_gvt_init_device(dev_priv);
245 	mutex_unlock(&intel_gvt_mutex);
246 
247 	return 0;
248 }
249 
250 /**
251  * intel_gvt_driver_remove - cleanup GVT components when i915 driver is
252  *			     unbinding
253  * @dev_priv: drm i915 private *
254  *
255  * This function is called at the i915 driver unloading stage, to shutdown
256  * GVT components and release the related resources.
257  */
intel_gvt_driver_remove(struct drm_i915_private * dev_priv)258 void intel_gvt_driver_remove(struct drm_i915_private *dev_priv)
259 {
260 	mutex_lock(&intel_gvt_mutex);
261 	intel_gvt_clean_device(dev_priv);
262 	list_del(&dev_priv->vgpu.entry);
263 	mutex_unlock(&intel_gvt_mutex);
264 }
265 
266 /**
267  * intel_gvt_resume - GVT resume routine wapper
268  *
269  * @dev_priv: drm i915 private *
270  *
271  * This function is called at the i915 driver resume stage to restore required
272  * HW status for GVT so that vGPU can continue running after resumed.
273  */
intel_gvt_resume(struct drm_i915_private * dev_priv)274 void intel_gvt_resume(struct drm_i915_private *dev_priv)
275 {
276 	mutex_lock(&intel_gvt_mutex);
277 	if (dev_priv->gvt)
278 		intel_gvt_ops->pm_resume(dev_priv);
279 	mutex_unlock(&intel_gvt_mutex);
280 }
281 
282 /*
283  * Exported here so that the exports only get created when GVT support is
284  * actually enabled.
285  */
286 EXPORT_SYMBOL_NS_GPL(i915_gem_object_alloc, I915_GVT);
287 EXPORT_SYMBOL_NS_GPL(i915_gem_object_create_shmem, I915_GVT);
288 EXPORT_SYMBOL_NS_GPL(i915_gem_object_init, I915_GVT);
289 EXPORT_SYMBOL_NS_GPL(i915_gem_object_ggtt_pin_ww, I915_GVT);
290 EXPORT_SYMBOL_NS_GPL(i915_gem_object_pin_map, I915_GVT);
291 EXPORT_SYMBOL_NS_GPL(i915_gem_object_set_to_cpu_domain, I915_GVT);
292 EXPORT_SYMBOL_NS_GPL(__i915_gem_object_flush_map, I915_GVT);
293 EXPORT_SYMBOL_NS_GPL(__i915_gem_object_set_pages, I915_GVT);
294 EXPORT_SYMBOL_NS_GPL(i915_gem_gtt_insert, I915_GVT);
295 EXPORT_SYMBOL_NS_GPL(i915_gem_prime_export, I915_GVT);
296 EXPORT_SYMBOL_NS_GPL(i915_gem_ww_ctx_init, I915_GVT);
297 EXPORT_SYMBOL_NS_GPL(i915_gem_ww_ctx_backoff, I915_GVT);
298 EXPORT_SYMBOL_NS_GPL(i915_gem_ww_ctx_fini, I915_GVT);
299 EXPORT_SYMBOL_NS_GPL(i915_ppgtt_create, I915_GVT);
300 EXPORT_SYMBOL_NS_GPL(i915_request_add, I915_GVT);
301 EXPORT_SYMBOL_NS_GPL(i915_request_create, I915_GVT);
302 EXPORT_SYMBOL_NS_GPL(i915_request_wait, I915_GVT);
303 EXPORT_SYMBOL_NS_GPL(i915_reserve_fence, I915_GVT);
304 EXPORT_SYMBOL_NS_GPL(i915_unreserve_fence, I915_GVT);
305 EXPORT_SYMBOL_NS_GPL(i915_vm_release, I915_GVT);
306 EXPORT_SYMBOL_NS_GPL(_i915_vma_move_to_active, I915_GVT);
307 EXPORT_SYMBOL_NS_GPL(intel_context_create, I915_GVT);
308 EXPORT_SYMBOL_NS_GPL(__intel_context_do_pin, I915_GVT);
309 EXPORT_SYMBOL_NS_GPL(__intel_context_do_unpin, I915_GVT);
310 EXPORT_SYMBOL_NS_GPL(intel_ring_begin, I915_GVT);
311 EXPORT_SYMBOL_NS_GPL(intel_runtime_pm_get, I915_GVT);
312 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)
313 EXPORT_SYMBOL_NS_GPL(intel_runtime_pm_put, I915_GVT);
314 #endif
315 EXPORT_SYMBOL_NS_GPL(intel_runtime_pm_put_unchecked, I915_GVT);
316 EXPORT_SYMBOL_NS_GPL(intel_uncore_forcewake_for_reg, I915_GVT);
317 EXPORT_SYMBOL_NS_GPL(intel_uncore_forcewake_get, I915_GVT);
318 EXPORT_SYMBOL_NS_GPL(intel_uncore_forcewake_put, I915_GVT);
319 EXPORT_SYMBOL_NS_GPL(shmem_pin_map, I915_GVT);
320 EXPORT_SYMBOL_NS_GPL(shmem_unpin_map, I915_GVT);
321 EXPORT_SYMBOL_NS_GPL(__px_dma, I915_GVT);
322 EXPORT_SYMBOL_NS_GPL(i915_fence_ops, I915_GVT);
323