summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/i915/gvt/mmio.c
blob: 11b71b33f1c0d8f82a598f39aa91382e5aeb58e3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
/*
 * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Authors:
 *    Ke Yu
 *    Kevin Tian <kevin.tian@intel.com>
 *    Dexuan Cui
 *
 * Contributors:
 *    Tina Zhang <tina.zhang@intel.com>
 *    Min He <min.he@intel.com>
 *    Niu Bing <bing.niu@intel.com>
 *    Zhi Wang <zhi.a.wang@intel.com>
 *
 */

#include "i915_drv.h"
#include "gvt.h"

/**
 * intel_vgpu_gpa_to_mmio_offset - translate a GPA to MMIO offset
 * @vgpu: a vGPU
 *
 * Returns:
 * Zero on success, negative error code if failed
 */
int intel_vgpu_gpa_to_mmio_offset(struct intel_vgpu *vgpu, u64 gpa)
{
	u64 gttmmio_gpa = intel_vgpu_get_bar_gpa(vgpu, PCI_BASE_ADDRESS_0);
	return gpa - gttmmio_gpa;
}

#define reg_is_mmio(gvt, reg)  \
	(reg >= 0 && reg < gvt->device_info.mmio_size)

#define reg_is_gtt(gvt, reg)   \
	(reg >= gvt->device_info.gtt_start_offset \
	 && reg < gvt->device_info.gtt_start_offset + gvt_ggtt_sz(gvt))

static void failsafe_emulate_mmio_rw(struct intel_vgpu *vgpu, uint64_t pa,
		void *p_data, unsigned int bytes, bool read)
{
	struct intel_gvt *gvt = NULL;
	void *pt = NULL;
	unsigned int offset = 0;

	if (!vgpu || !p_data)
		return;

	gvt = vgpu->gvt;
	mutex_lock(&gvt->lock);
	offset = intel_vgpu_gpa_to_mmio_offset(vgpu, pa);
	if (reg_is_mmio(gvt, offset)) {
		if (read)
			intel_vgpu_default_mmio_read(vgpu, offset, p_data,
					bytes);
		else
			intel_vgpu_default_mmio_write(vgpu, offset, p_data,
					bytes);
	} else if (reg_is_gtt(gvt, offset)) {
		offset -= gvt->device_info.gtt_start_offset;
		pt = vgpu->gtt.ggtt_mm->ggtt_mm.virtual_ggtt + offset;
		if (read)
			memcpy(p_data, pt, bytes);
		else
			memcpy(pt, p_data, bytes);

	}
	mutex_unlock(&gvt->lock);
}

/**
 * intel_vgpu_emulate_mmio_read - emulate MMIO read
 * @vgpu: a vGPU
 * @pa: guest physical address
 * @p_data: data return buffer
 * @bytes: access data length
 *
 * Returns:
 * Zero on success, negative error code if failed
 */
int intel_vgpu_emulate_mmio_read(struct intel_vgpu *vgpu, uint64_t pa,
		void *p_data, unsigned int bytes)
{
	struct intel_gvt *gvt = vgpu->gvt;
	unsigned int offset = 0;
	int ret = -EINVAL;

	if (vgpu->failsafe) {
		failsafe_emulate_mmio_rw(vgpu, pa, p_data, bytes, true);
		return 0;
	}
	mutex_lock(&gvt->lock);

	offset = intel_vgpu_gpa_to_mmio_offset(vgpu, pa);

	if (WARN_ON(bytes > 8))
		goto err;

	if (reg_is_gtt(gvt, offset)) {
		if (WARN_ON(!IS_ALIGNED(offset, 4) && !IS_ALIGNED(offset, 8)))
			goto err;
		if (WARN_ON(bytes != 4 && bytes != 8))
			goto err;
		if (WARN_ON(!reg_is_gtt(gvt, offset + bytes - 1)))
			goto err;

		ret = intel_vgpu_emulate_ggtt_mmio_read(vgpu, offset,
				p_data, bytes);
		if (ret)
			goto err;
		goto out;
	}

	if (WARN_ON_ONCE(!reg_is_mmio(gvt, offset))) {
		ret = intel_gvt_hypervisor_read_gpa(vgpu, pa, p_data, bytes);
		goto out;
	}

	if (WARN_ON(!reg_is_mmio(gvt, offset + bytes - 1)))
		goto err;

	if (!intel_gvt_mmio_is_unalign(gvt, offset)) {
		if (WARN_ON(!IS_ALIGNED(offset, bytes)))
			goto err;
	}

	ret = intel_vgpu_mmio_reg_rw(vgpu, offset, p_data, bytes, true);
	if (ret < 0)
		goto err;

	intel_gvt_mmio_set_accessed(gvt, offset);
	ret = 0;
	goto out;

err:
	gvt_vgpu_err("fail to emulate MMIO read %08x len %d\n",
			offset, bytes);
out:
	mutex_unlock(&gvt->lock);
	return ret;
}

/**
 * intel_vgpu_emulate_mmio_write - emulate MMIO write
 * @vgpu: a vGPU
 * @pa: guest physical address
 * @p_data: write data buffer
 * @bytes: access data length
 *
 * Returns:
 * Zero on success, negative error code if failed
 */
int intel_vgpu_emulate_mmio_write(struct intel_vgpu *vgpu, uint64_t pa,
		void *p_data, unsigned int bytes)
{
	struct intel_gvt *gvt = vgpu->gvt;
	unsigned int offset = 0;
	int ret = -EINVAL;

	if (vgpu->failsafe) {
		failsafe_emulate_mmio_rw(vgpu, pa, p_data, bytes, false);
		return 0;
	}

	mutex_lock(&gvt->lock);

	offset = intel_vgpu_gpa_to_mmio_offset(vgpu, pa);

	if (WARN_ON(bytes > 8))
		goto err;

	if (reg_is_gtt(gvt, offset)) {
		if (WARN_ON(!IS_ALIGNED(offset, 4) && !IS_ALIGNED(offset, 8)))
			goto err;
		if (WARN_ON(bytes != 4 && bytes != 8))
			goto err;
		if (WARN_ON(!reg_is_gtt(gvt, offset + bytes - 1)))
			goto err;

		ret = intel_vgpu_emulate_ggtt_mmio_write(vgpu, offset,
				p_data, bytes);
		if (ret)
			goto err;
		goto out;
	}

	if (WARN_ON_ONCE(!reg_is_mmio(gvt, offset))) {
		ret = intel_gvt_hypervisor_write_gpa(vgpu, pa, p_data, bytes);
		goto out;
	}

	ret = intel_vgpu_mmio_reg_rw(vgpu, offset, p_data, bytes, false);
	if (ret < 0)
		goto err;

	intel_gvt_mmio_set_accessed(gvt, offset);
	ret = 0;
	goto out;
err:
	gvt_vgpu_err("fail to emulate MMIO write %08x len %d\n", offset,
		     bytes);
out:
	mutex_unlock(&gvt->lock);
	return ret;
}


/**
 * intel_vgpu_reset_mmio - reset virtual MMIO space
 * @vgpu: a vGPU
 *
 */
void intel_vgpu_reset_mmio(struct intel_vgpu *vgpu, bool dmlr)
{
	struct intel_gvt *gvt = vgpu->gvt;
	const struct intel_gvt_device_info *info = &gvt->device_info;
	void  *mmio = gvt->firmware.mmio;

	if (dmlr) {
		memcpy(vgpu->mmio.vreg, mmio, info->mmio_size);
		memcpy(vgpu->mmio.sreg, mmio, info->mmio_size);

		vgpu_vreg_t(vgpu, GEN6_GT_THREAD_STATUS_REG) = 0;

		/* set the bit 0:2(Core C-State ) to C0 */
		vgpu_vreg_t(vgpu, GEN6_GT_CORE_STATUS) = 0;

		vgpu->mmio.disable_warn_untrack = false;
	} else {
#define GVT_GEN8_MMIO_RESET_OFFSET		(0x44200)
		/* only reset the engine related, so starting with 0x44200
		 * interrupt include DE,display mmio related will not be
		 * touched
		 */
		memcpy(vgpu->mmio.vreg, mmio, GVT_GEN8_MMIO_RESET_OFFSET);
		memcpy(vgpu->mmio.sreg, mmio, GVT_GEN8_MMIO_RESET_OFFSET);
	}

}

/**
 * intel_vgpu_init_mmio - init MMIO  space
 * @vgpu: a vGPU
 *
 * Returns:
 * Zero on success, negative error code if failed
 */
int intel_vgpu_init_mmio(struct intel_vgpu *vgpu)
{
	const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;

	vgpu->mmio.vreg = vzalloc(info->mmio_size * 2);
	if (!vgpu->mmio.vreg)
		return -ENOMEM;

	vgpu->mmio.sreg = vgpu->mmio.vreg + info->mmio_size;

	intel_vgpu_reset_mmio(vgpu, true);

	return 0;
}

/**
 * intel_vgpu_clean_mmio - clean MMIO space
 * @vgpu: a vGPU
 *
 */
void intel_vgpu_clean_mmio(struct intel_vgpu *vgpu)
{
	vfree(vgpu->mmio.vreg);
	vgpu->mmio.vreg = vgpu->mmio.sreg = NULL;
}