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