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 * Ke Yu
25 * Kevin Tian <kevin.tian@intel.com>
26 * Dexuan Cui
27 *
28 * Contributors:
29 * Tina Zhang <tina.zhang@intel.com>
30 * Min He <min.he@intel.com>
31 * Niu Bing <bing.niu@intel.com>
32 * Zhi Wang <zhi.a.wang@intel.com>
33 *
34 */
35
36#include "i915_drv.h"
37#include "i915_reg.h"
38#include "gvt.h"
39
40#include "display/intel_dpio_phy.h"
41#include "gt/intel_gt_regs.h"
42
43/**
44 * intel_vgpu_gpa_to_mmio_offset - translate a GPA to MMIO offset
45 * @vgpu: a vGPU
46 * @gpa: guest physical address
47 *
48 * Returns:
49 * Zero on success, negative error code if failed
50 */
51int intel_vgpu_gpa_to_mmio_offset(struct intel_vgpu *vgpu, u64 gpa)
52{
53 u64 gttmmio_gpa = intel_vgpu_get_bar_gpa(vgpu, PCI_BASE_ADDRESS_0);
54 return gpa - gttmmio_gpa;
55}
56
57#define reg_is_mmio(gvt, reg) \
58 (reg >= 0 && reg < gvt->device_info.mmio_size)
59
60#define reg_is_gtt(gvt, reg) \
61 (reg >= gvt->device_info.gtt_start_offset \
62 && reg < gvt->device_info.gtt_start_offset + gvt_ggtt_sz(gvt))
63
64static void failsafe_emulate_mmio_rw(struct intel_vgpu *vgpu, u64 pa,
65 void *p_data, unsigned int bytes, bool read)
66{
67 struct intel_gvt *gvt = NULL;
68 void *pt = NULL;
69 unsigned int offset = 0;
70
71 if (!vgpu || !p_data)
72 return;
73
74 gvt = vgpu->gvt;
75 mutex_lock(&vgpu->vgpu_lock);
76 offset = intel_vgpu_gpa_to_mmio_offset(vgpu, gpa: pa);
77 if (reg_is_mmio(gvt, offset)) {
78 if (read)
79 intel_vgpu_default_mmio_read(vgpu, offset, p_data,
80 bytes);
81 else
82 intel_vgpu_default_mmio_write(vgpu, offset, p_data,
83 bytes);
84 } else if (reg_is_gtt(gvt, offset)) {
85 offset -= gvt->device_info.gtt_start_offset;
86 pt = vgpu->gtt.ggtt_mm->ggtt_mm.virtual_ggtt + offset;
87 if (read)
88 memcpy(p_data, pt, bytes);
89 else
90 memcpy(pt, p_data, bytes);
91
92 }
93 mutex_unlock(lock: &vgpu->vgpu_lock);
94}
95
96/**
97 * intel_vgpu_emulate_mmio_read - emulate MMIO read
98 * @vgpu: a vGPU
99 * @pa: guest physical address
100 * @p_data: data return buffer
101 * @bytes: access data length
102 *
103 * Returns:
104 * Zero on success, negative error code if failed
105 */
106int intel_vgpu_emulate_mmio_read(struct intel_vgpu *vgpu, u64 pa,
107 void *p_data, unsigned int bytes)
108{
109 struct intel_gvt *gvt = vgpu->gvt;
110 struct drm_i915_private *i915 = gvt->gt->i915;
111 unsigned int offset = 0;
112 int ret = -EINVAL;
113
114 if (vgpu->failsafe) {
115 failsafe_emulate_mmio_rw(vgpu, pa, p_data, bytes, read: true);
116 return 0;
117 }
118 mutex_lock(&vgpu->vgpu_lock);
119
120 offset = intel_vgpu_gpa_to_mmio_offset(vgpu, gpa: pa);
121
122 if (drm_WARN_ON(&i915->drm, bytes > 8))
123 goto err;
124
125 if (reg_is_gtt(gvt, offset)) {
126 if (drm_WARN_ON(&i915->drm, !IS_ALIGNED(offset, 4) &&
127 !IS_ALIGNED(offset, 8)))
128 goto err;
129 if (drm_WARN_ON(&i915->drm, bytes != 4 && bytes != 8))
130 goto err;
131 if (drm_WARN_ON(&i915->drm,
132 !reg_is_gtt(gvt, offset + bytes - 1)))
133 goto err;
134
135 ret = intel_vgpu_emulate_ggtt_mmio_read(vgpu, off: offset,
136 p_data, bytes);
137 if (ret)
138 goto err;
139 goto out;
140 }
141
142 if (drm_WARN_ON_ONCE(&i915->drm, !reg_is_mmio(gvt, offset))) {
143 ret = intel_gvt_read_gpa(vgpu, gpa: pa, buf: p_data, len: bytes);
144 goto out;
145 }
146
147 if (drm_WARN_ON(&i915->drm, !reg_is_mmio(gvt, offset + bytes - 1)))
148 goto err;
149
150 if (!intel_gvt_mmio_is_unalign(gvt, offset)) {
151 if (drm_WARN_ON(&i915->drm, !IS_ALIGNED(offset, bytes)))
152 goto err;
153 }
154
155 ret = intel_vgpu_mmio_reg_rw(vgpu, offset, pdata: p_data, bytes, is_read: true);
156 if (ret < 0)
157 goto err;
158
159 intel_gvt_mmio_set_accessed(gvt, offset);
160 ret = 0;
161 goto out;
162
163err:
164 gvt_vgpu_err("fail to emulate MMIO read %08x len %d\n",
165 offset, bytes);
166out:
167 mutex_unlock(lock: &vgpu->vgpu_lock);
168 return ret;
169}
170
171/**
172 * intel_vgpu_emulate_mmio_write - emulate MMIO write
173 * @vgpu: a vGPU
174 * @pa: guest physical address
175 * @p_data: write data buffer
176 * @bytes: access data length
177 *
178 * Returns:
179 * Zero on success, negative error code if failed
180 */
181int intel_vgpu_emulate_mmio_write(struct intel_vgpu *vgpu, u64 pa,
182 void *p_data, unsigned int bytes)
183{
184 struct intel_gvt *gvt = vgpu->gvt;
185 struct drm_i915_private *i915 = gvt->gt->i915;
186 unsigned int offset = 0;
187 int ret = -EINVAL;
188
189 if (vgpu->failsafe) {
190 failsafe_emulate_mmio_rw(vgpu, pa, p_data, bytes, read: false);
191 return 0;
192 }
193
194 mutex_lock(&vgpu->vgpu_lock);
195
196 offset = intel_vgpu_gpa_to_mmio_offset(vgpu, gpa: pa);
197
198 if (drm_WARN_ON(&i915->drm, bytes > 8))
199 goto err;
200
201 if (reg_is_gtt(gvt, offset)) {
202 if (drm_WARN_ON(&i915->drm, !IS_ALIGNED(offset, 4) &&
203 !IS_ALIGNED(offset, 8)))
204 goto err;
205 if (drm_WARN_ON(&i915->drm, bytes != 4 && bytes != 8))
206 goto err;
207 if (drm_WARN_ON(&i915->drm,
208 !reg_is_gtt(gvt, offset + bytes - 1)))
209 goto err;
210
211 ret = intel_vgpu_emulate_ggtt_mmio_write(vgpu, off: offset,
212 p_data, bytes);
213 if (ret)
214 goto err;
215 goto out;
216 }
217
218 if (drm_WARN_ON_ONCE(&i915->drm, !reg_is_mmio(gvt, offset))) {
219 ret = intel_gvt_write_gpa(vgpu, gpa: pa, buf: p_data, len: bytes);
220 goto out;
221 }
222
223 ret = intel_vgpu_mmio_reg_rw(vgpu, offset, pdata: p_data, bytes, is_read: false);
224 if (ret < 0)
225 goto err;
226
227 intel_gvt_mmio_set_accessed(gvt, offset);
228 ret = 0;
229 goto out;
230err:
231 gvt_vgpu_err("fail to emulate MMIO write %08x len %d\n", offset,
232 bytes);
233out:
234 mutex_unlock(lock: &vgpu->vgpu_lock);
235 return ret;
236}
237
238
239/**
240 * intel_vgpu_reset_mmio - reset virtual MMIO space
241 * @vgpu: a vGPU
242 * @dmlr: whether this is device model level reset
243 */
244void intel_vgpu_reset_mmio(struct intel_vgpu *vgpu, bool dmlr)
245{
246 struct intel_gvt *gvt = vgpu->gvt;
247 const struct intel_gvt_device_info *info = &gvt->device_info;
248 void *mmio = gvt->firmware.mmio;
249
250 if (dmlr) {
251 memcpy(vgpu->mmio.vreg, mmio, info->mmio_size);
252
253 vgpu_vreg_t(vgpu, GEN6_GT_THREAD_STATUS_REG) = 0;
254
255 /* set the bit 0:2(Core C-State ) to C0 */
256 vgpu_vreg_t(vgpu, GEN6_GT_CORE_STATUS) = 0;
257
258 /* uc reset hw expect GS_MIA_IN_RESET */
259 vgpu_vreg_t(vgpu, GUC_STATUS) |= GS_MIA_IN_RESET;
260
261 if (IS_BROXTON(vgpu->gvt->gt->i915)) {
262 vgpu_vreg_t(vgpu, BXT_P_CR_GT_DISP_PWRON) &=
263 ~(BIT(0) | BIT(1));
264 vgpu_vreg_t(vgpu, BXT_PORT_CL1CM_DW0(DPIO_PHY0)) &=
265 ~PHY_POWER_GOOD;
266 vgpu_vreg_t(vgpu, BXT_PORT_CL1CM_DW0(DPIO_PHY1)) &=
267 ~PHY_POWER_GOOD;
268 vgpu_vreg_t(vgpu, BXT_PHY_CTL_FAMILY(DPIO_PHY0)) &=
269 ~BIT(30);
270 vgpu_vreg_t(vgpu, BXT_PHY_CTL_FAMILY(DPIO_PHY1)) &=
271 ~BIT(30);
272 vgpu_vreg_t(vgpu, BXT_PHY_CTL(PORT_A)) &=
273 ~BXT_PHY_LANE_ENABLED;
274 vgpu_vreg_t(vgpu, BXT_PHY_CTL(PORT_A)) |=
275 BXT_PHY_CMNLANE_POWERDOWN_ACK |
276 BXT_PHY_LANE_POWERDOWN_ACK;
277 vgpu_vreg_t(vgpu, BXT_PHY_CTL(PORT_B)) &=
278 ~BXT_PHY_LANE_ENABLED;
279 vgpu_vreg_t(vgpu, BXT_PHY_CTL(PORT_B)) |=
280 BXT_PHY_CMNLANE_POWERDOWN_ACK |
281 BXT_PHY_LANE_POWERDOWN_ACK;
282 vgpu_vreg_t(vgpu, BXT_PHY_CTL(PORT_C)) &=
283 ~BXT_PHY_LANE_ENABLED;
284 vgpu_vreg_t(vgpu, BXT_PHY_CTL(PORT_C)) |=
285 BXT_PHY_CMNLANE_POWERDOWN_ACK |
286 BXT_PHY_LANE_POWERDOWN_ACK;
287 vgpu_vreg_t(vgpu, SKL_FUSE_STATUS) |=
288 SKL_FUSE_DOWNLOAD_STATUS |
289 SKL_FUSE_PG_DIST_STATUS(SKL_PG0) |
290 SKL_FUSE_PG_DIST_STATUS(SKL_PG1) |
291 SKL_FUSE_PG_DIST_STATUS(SKL_PG2);
292 }
293 } else {
294#define GVT_GEN8_MMIO_RESET_OFFSET (0x44200)
295 /* only reset the engine related, so starting with 0x44200
296 * interrupt include DE,display mmio related will not be
297 * touched
298 */
299 memcpy(vgpu->mmio.vreg, mmio, GVT_GEN8_MMIO_RESET_OFFSET);
300 }
301
302}
303
304/**
305 * intel_vgpu_init_mmio - init MMIO space
306 * @vgpu: a vGPU
307 *
308 * Returns:
309 * Zero on success, negative error code if failed
310 */
311int intel_vgpu_init_mmio(struct intel_vgpu *vgpu)
312{
313 const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;
314
315 vgpu->mmio.vreg = vzalloc(size: info->mmio_size);
316 if (!vgpu->mmio.vreg)
317 return -ENOMEM;
318
319 intel_vgpu_reset_mmio(vgpu, dmlr: true);
320
321 return 0;
322}
323
324/**
325 * intel_vgpu_clean_mmio - clean MMIO space
326 * @vgpu: a vGPU
327 *
328 */
329void intel_vgpu_clean_mmio(struct intel_vgpu *vgpu)
330{
331 vfree(addr: vgpu->mmio.vreg);
332 vgpu->mmio.vreg = NULL;
333}
334

source code of linux/drivers/gpu/drm/i915/gvt/mmio.c