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  * Authors:
24  *    Kevin Tian <kevin.tian@intel.com>
25  *    Dexuan Cui
26  *
27  * Contributors:
28  *    Pei Zhang <pei.zhang@intel.com>
29  *    Min He <min.he@intel.com>
30  *    Niu Bing <bing.niu@intel.com>
31  *    Yulei Zhang <yulei.zhang@intel.com>
32  *    Zhenyu Wang <zhenyuw@linux.intel.com>
33  *    Zhi Wang <zhi.a.wang@intel.com>
34  *
35  */
36 
37 #include "i915_drv.h"
38 #include "i915_gem_fence_reg.h"
39 #include "gvt.h"
40 
41 static int alloc_gm(struct intel_vgpu *vgpu, bool high_gm)
42 {
43 	struct intel_gvt *gvt = vgpu->gvt;
44 	struct drm_i915_private *dev_priv = gvt->dev_priv;
45 	unsigned int flags;
46 	u64 start, end, size;
47 	struct drm_mm_node *node;
48 	int ret;
49 
50 	if (high_gm) {
51 		node = &vgpu->gm.high_gm_node;
52 		size = vgpu_hidden_sz(vgpu);
53 		start = ALIGN(gvt_hidden_gmadr_base(gvt), I915_GTT_PAGE_SIZE);
54 		end = ALIGN(gvt_hidden_gmadr_end(gvt), I915_GTT_PAGE_SIZE);
55 		flags = PIN_HIGH;
56 	} else {
57 		node = &vgpu->gm.low_gm_node;
58 		size = vgpu_aperture_sz(vgpu);
59 		start = ALIGN(gvt_aperture_gmadr_base(gvt), I915_GTT_PAGE_SIZE);
60 		end = ALIGN(gvt_aperture_gmadr_end(gvt), I915_GTT_PAGE_SIZE);
61 		flags = PIN_MAPPABLE;
62 	}
63 
64 	mutex_lock(&dev_priv->ggtt.vm.mutex);
65 	mmio_hw_access_pre(dev_priv);
66 	ret = i915_gem_gtt_insert(&dev_priv->ggtt.vm, node,
67 				  size, I915_GTT_PAGE_SIZE,
68 				  I915_COLOR_UNEVICTABLE,
69 				  start, end, flags);
70 	mmio_hw_access_post(dev_priv);
71 	mutex_unlock(&dev_priv->ggtt.vm.mutex);
72 	if (ret)
73 		gvt_err("fail to alloc %s gm space from host\n",
74 			high_gm ? "high" : "low");
75 
76 	return ret;
77 }
78 
79 static int alloc_vgpu_gm(struct intel_vgpu *vgpu)
80 {
81 	struct intel_gvt *gvt = vgpu->gvt;
82 	struct drm_i915_private *dev_priv = gvt->dev_priv;
83 	int ret;
84 
85 	ret = alloc_gm(vgpu, false);
86 	if (ret)
87 		return ret;
88 
89 	ret = alloc_gm(vgpu, true);
90 	if (ret)
91 		goto out_free_aperture;
92 
93 	gvt_dbg_core("vgpu%d: alloc low GM start %llx size %llx\n", vgpu->id,
94 		     vgpu_aperture_offset(vgpu), vgpu_aperture_sz(vgpu));
95 
96 	gvt_dbg_core("vgpu%d: alloc high GM start %llx size %llx\n", vgpu->id,
97 		     vgpu_hidden_offset(vgpu), vgpu_hidden_sz(vgpu));
98 
99 	return 0;
100 out_free_aperture:
101 	mutex_lock(&dev_priv->ggtt.vm.mutex);
102 	drm_mm_remove_node(&vgpu->gm.low_gm_node);
103 	mutex_unlock(&dev_priv->ggtt.vm.mutex);
104 	return ret;
105 }
106 
107 static void free_vgpu_gm(struct intel_vgpu *vgpu)
108 {
109 	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
110 
111 	mutex_lock(&dev_priv->ggtt.vm.mutex);
112 	drm_mm_remove_node(&vgpu->gm.low_gm_node);
113 	drm_mm_remove_node(&vgpu->gm.high_gm_node);
114 	mutex_unlock(&dev_priv->ggtt.vm.mutex);
115 }
116 
117 /**
118  * intel_vgpu_write_fence - write fence registers owned by a vGPU
119  * @vgpu: vGPU instance
120  * @fence: vGPU fence register number
121  * @value: Fence register value to be written
122  *
123  * This function is used to write fence registers owned by a vGPU. The vGPU
124  * fence register number will be translated into HW fence register number.
125  *
126  */
127 void intel_vgpu_write_fence(struct intel_vgpu *vgpu,
128 		u32 fence, u64 value)
129 {
130 	struct intel_gvt *gvt = vgpu->gvt;
131 	struct drm_i915_private *dev_priv = gvt->dev_priv;
132 	struct i915_fence_reg *reg;
133 	i915_reg_t fence_reg_lo, fence_reg_hi;
134 
135 	assert_rpm_wakelock_held(&dev_priv->runtime_pm);
136 
137 	if (WARN_ON(fence >= vgpu_fence_sz(vgpu)))
138 		return;
139 
140 	reg = vgpu->fence.regs[fence];
141 	if (WARN_ON(!reg))
142 		return;
143 
144 	fence_reg_lo = FENCE_REG_GEN6_LO(reg->id);
145 	fence_reg_hi = FENCE_REG_GEN6_HI(reg->id);
146 
147 	I915_WRITE(fence_reg_lo, 0);
148 	POSTING_READ(fence_reg_lo);
149 
150 	I915_WRITE(fence_reg_hi, upper_32_bits(value));
151 	I915_WRITE(fence_reg_lo, lower_32_bits(value));
152 	POSTING_READ(fence_reg_lo);
153 }
154 
155 static void _clear_vgpu_fence(struct intel_vgpu *vgpu)
156 {
157 	int i;
158 
159 	for (i = 0; i < vgpu_fence_sz(vgpu); i++)
160 		intel_vgpu_write_fence(vgpu, i, 0);
161 }
162 
163 static void free_vgpu_fence(struct intel_vgpu *vgpu)
164 {
165 	struct intel_gvt *gvt = vgpu->gvt;
166 	struct drm_i915_private *dev_priv = gvt->dev_priv;
167 	struct i915_fence_reg *reg;
168 	u32 i;
169 
170 	if (WARN_ON(!vgpu_fence_sz(vgpu)))
171 		return;
172 
173 	intel_runtime_pm_get(&dev_priv->runtime_pm);
174 
175 	mutex_lock(&dev_priv->ggtt.vm.mutex);
176 	_clear_vgpu_fence(vgpu);
177 	for (i = 0; i < vgpu_fence_sz(vgpu); i++) {
178 		reg = vgpu->fence.regs[i];
179 		i915_unreserve_fence(reg);
180 		vgpu->fence.regs[i] = NULL;
181 	}
182 	mutex_unlock(&dev_priv->ggtt.vm.mutex);
183 
184 	intel_runtime_pm_put_unchecked(&dev_priv->runtime_pm);
185 }
186 
187 static int alloc_vgpu_fence(struct intel_vgpu *vgpu)
188 {
189 	struct intel_gvt *gvt = vgpu->gvt;
190 	struct drm_i915_private *dev_priv = gvt->dev_priv;
191 	struct intel_runtime_pm *rpm = &dev_priv->runtime_pm;
192 	struct i915_fence_reg *reg;
193 	int i;
194 
195 	intel_runtime_pm_get(rpm);
196 
197 	/* Request fences from host */
198 	mutex_lock(&dev_priv->ggtt.vm.mutex);
199 
200 	for (i = 0; i < vgpu_fence_sz(vgpu); i++) {
201 		reg = i915_reserve_fence(&dev_priv->ggtt);
202 		if (IS_ERR(reg))
203 			goto out_free_fence;
204 
205 		vgpu->fence.regs[i] = reg;
206 	}
207 
208 	_clear_vgpu_fence(vgpu);
209 
210 	mutex_unlock(&dev_priv->ggtt.vm.mutex);
211 	intel_runtime_pm_put_unchecked(rpm);
212 	return 0;
213 out_free_fence:
214 	gvt_vgpu_err("Failed to alloc fences\n");
215 	/* Return fences to host, if fail */
216 	for (i = 0; i < vgpu_fence_sz(vgpu); i++) {
217 		reg = vgpu->fence.regs[i];
218 		if (!reg)
219 			continue;
220 		i915_unreserve_fence(reg);
221 		vgpu->fence.regs[i] = NULL;
222 	}
223 	mutex_unlock(&dev_priv->ggtt.vm.mutex);
224 	intel_runtime_pm_put_unchecked(rpm);
225 	return -ENOSPC;
226 }
227 
228 static void free_resource(struct intel_vgpu *vgpu)
229 {
230 	struct intel_gvt *gvt = vgpu->gvt;
231 
232 	gvt->gm.vgpu_allocated_low_gm_size -= vgpu_aperture_sz(vgpu);
233 	gvt->gm.vgpu_allocated_high_gm_size -= vgpu_hidden_sz(vgpu);
234 	gvt->fence.vgpu_allocated_fence_num -= vgpu_fence_sz(vgpu);
235 }
236 
237 static int alloc_resource(struct intel_vgpu *vgpu,
238 		struct intel_vgpu_creation_params *param)
239 {
240 	struct intel_gvt *gvt = vgpu->gvt;
241 	unsigned long request, avail, max, taken;
242 	const char *item;
243 
244 	if (!param->low_gm_sz || !param->high_gm_sz || !param->fence_sz) {
245 		gvt_vgpu_err("Invalid vGPU creation params\n");
246 		return -EINVAL;
247 	}
248 
249 	item = "low GM space";
250 	max = gvt_aperture_sz(gvt) - HOST_LOW_GM_SIZE;
251 	taken = gvt->gm.vgpu_allocated_low_gm_size;
252 	avail = max - taken;
253 	request = MB_TO_BYTES(param->low_gm_sz);
254 
255 	if (request > avail)
256 		goto no_enough_resource;
257 
258 	vgpu_aperture_sz(vgpu) = ALIGN(request, I915_GTT_PAGE_SIZE);
259 
260 	item = "high GM space";
261 	max = gvt_hidden_sz(gvt) - HOST_HIGH_GM_SIZE;
262 	taken = gvt->gm.vgpu_allocated_high_gm_size;
263 	avail = max - taken;
264 	request = MB_TO_BYTES(param->high_gm_sz);
265 
266 	if (request > avail)
267 		goto no_enough_resource;
268 
269 	vgpu_hidden_sz(vgpu) = ALIGN(request, I915_GTT_PAGE_SIZE);
270 
271 	item = "fence";
272 	max = gvt_fence_sz(gvt) - HOST_FENCE;
273 	taken = gvt->fence.vgpu_allocated_fence_num;
274 	avail = max - taken;
275 	request = param->fence_sz;
276 
277 	if (request > avail)
278 		goto no_enough_resource;
279 
280 	vgpu_fence_sz(vgpu) = request;
281 
282 	gvt->gm.vgpu_allocated_low_gm_size += MB_TO_BYTES(param->low_gm_sz);
283 	gvt->gm.vgpu_allocated_high_gm_size += MB_TO_BYTES(param->high_gm_sz);
284 	gvt->fence.vgpu_allocated_fence_num += param->fence_sz;
285 	return 0;
286 
287 no_enough_resource:
288 	gvt_err("fail to allocate resource %s\n", item);
289 	gvt_err("request %luMB avail %luMB max %luMB taken %luMB\n",
290 		BYTES_TO_MB(request), BYTES_TO_MB(avail),
291 		BYTES_TO_MB(max), BYTES_TO_MB(taken));
292 	return -ENOSPC;
293 }
294 
295 /**
296  * inte_gvt_free_vgpu_resource - free HW resource owned by a vGPU
297  * @vgpu: a vGPU
298  *
299  * This function is used to free the HW resource owned by a vGPU.
300  *
301  */
302 void intel_vgpu_free_resource(struct intel_vgpu *vgpu)
303 {
304 	free_vgpu_gm(vgpu);
305 	free_vgpu_fence(vgpu);
306 	free_resource(vgpu);
307 }
308 
309 /**
310  * intel_vgpu_reset_resource - reset resource state owned by a vGPU
311  * @vgpu: a vGPU
312  *
313  * This function is used to reset resource state owned by a vGPU.
314  *
315  */
316 void intel_vgpu_reset_resource(struct intel_vgpu *vgpu)
317 {
318 	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
319 
320 	intel_runtime_pm_get(&dev_priv->runtime_pm);
321 	_clear_vgpu_fence(vgpu);
322 	intel_runtime_pm_put_unchecked(&dev_priv->runtime_pm);
323 }
324 
325 /**
326  * intel_alloc_vgpu_resource - allocate HW resource for a vGPU
327  * @vgpu: vGPU
328  * @param: vGPU creation params
329  *
330  * This function is used to allocate HW resource for a vGPU. User specifies
331  * the resource configuration through the creation params.
332  *
333  * Returns:
334  * zero on success, negative error code if failed.
335  *
336  */
337 int intel_vgpu_alloc_resource(struct intel_vgpu *vgpu,
338 		struct intel_vgpu_creation_params *param)
339 {
340 	int ret;
341 
342 	ret = alloc_resource(vgpu, param);
343 	if (ret)
344 		return ret;
345 
346 	ret = alloc_vgpu_gm(vgpu);
347 	if (ret)
348 		goto out_free_resource;
349 
350 	ret = alloc_vgpu_fence(vgpu);
351 	if (ret)
352 		goto out_free_vgpu_gm;
353 
354 	return 0;
355 
356 out_free_vgpu_gm:
357 	free_vgpu_gm(vgpu);
358 out_free_resource:
359 	free_resource(vgpu);
360 	return ret;
361 }
362