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 <linux/acpi.h> 25 #include "i915_drv.h" 26 #include "gvt.h" 27 28 /* 29 * Note: Only for GVT-g virtual VBT generation, other usage must 30 * not do like this. 31 */ 32 #define _INTEL_BIOS_PRIVATE 33 #include "display/intel_vbt_defs.h" 34 35 #define OPREGION_SIGNATURE "IntelGraphicsMem" 36 #define MBOX_VBT (1<<3) 37 38 /* device handle */ 39 #define DEVICE_TYPE_CRT 0x01 40 #define DEVICE_TYPE_EFP1 0x04 41 #define DEVICE_TYPE_EFP2 0x40 42 #define DEVICE_TYPE_EFP3 0x20 43 #define DEVICE_TYPE_EFP4 0x10 44 45 struct opregion_header { 46 u8 signature[16]; 47 u32 size; 48 u32 opregion_ver; 49 u8 bios_ver[32]; 50 u8 vbios_ver[16]; 51 u8 driver_ver[16]; 52 u32 mboxes; 53 u32 driver_model; 54 u32 pcon; 55 u8 dver[32]; 56 u8 rsvd[124]; 57 } __packed; 58 59 struct bdb_data_header { 60 u8 id; 61 u16 size; /* data size */ 62 } __packed; 63 64 /* For supporting windows guest with opregion, here hardcode the emulated 65 * bdb header version as '186', and the corresponding child_device_config 66 * length should be '33' but not '38'. 67 */ 68 struct efp_child_device_config { 69 u16 handle; 70 u16 device_type; 71 u16 device_class; 72 u8 i2c_speed; 73 u8 dp_onboard_redriver; /* 158 */ 74 u8 dp_ondock_redriver; /* 158 */ 75 u8 hdmi_level_shifter_value:4; /* 169 */ 76 u8 hdmi_max_data_rate:4; /* 204 */ 77 u16 dtd_buf_ptr; /* 161 */ 78 u8 edidless_efp:1; /* 161 */ 79 u8 compression_enable:1; /* 198 */ 80 u8 compression_method:1; /* 198 */ 81 u8 ganged_edp:1; /* 202 */ 82 u8 skip0:4; 83 u8 compression_structure_index:4; /* 198 */ 84 u8 skip1:4; 85 u8 slave_port; /* 202 */ 86 u8 skip2; 87 u8 dvo_port; 88 u8 i2c_pin; /* for add-in card */ 89 u8 target_addr; /* for add-in card */ 90 u8 ddc_pin; 91 u16 edid_ptr; 92 u8 dvo_config; 93 u8 efp_docked_port:1; /* 158 */ 94 u8 lane_reversal:1; /* 184 */ 95 u8 onboard_lspcon:1; /* 192 */ 96 u8 iboost_enable:1; /* 196 */ 97 u8 hpd_invert:1; /* BXT 196 */ 98 u8 slip3:3; 99 u8 hdmi_compat:1; 100 u8 dp_compat:1; 101 u8 tmds_compat:1; 102 u8 skip4:5; 103 u8 aux_channel; 104 u8 dongle_detect; 105 u8 pipe_cap:2; 106 u8 sdvo_stall:1; /* 158 */ 107 u8 hpd_status:2; 108 u8 integrated_encoder:1; 109 u8 skip5:2; 110 u8 dvo_wiring; 111 u8 mipi_bridge_type; /* 171 */ 112 u16 device_class_ext; 113 u8 dvo_function; 114 } __packed; 115 116 struct vbt { 117 /* header->bdb_offset point to bdb_header offset */ 118 struct vbt_header header; 119 struct bdb_header bdb_header; 120 121 struct bdb_data_header general_features_header; 122 struct bdb_general_features general_features; 123 124 struct bdb_data_header general_definitions_header; 125 struct bdb_general_definitions general_definitions; 126 127 struct efp_child_device_config child0; 128 struct efp_child_device_config child1; 129 struct efp_child_device_config child2; 130 struct efp_child_device_config child3; 131 132 struct bdb_data_header driver_features_header; 133 struct bdb_driver_features driver_features; 134 }; 135 136 static void virt_vbt_generation(struct vbt *v) 137 { 138 int num_child; 139 140 memset(v, 0, sizeof(struct vbt)); 141 142 v->header.signature[0] = '$'; 143 v->header.signature[1] = 'V'; 144 v->header.signature[2] = 'B'; 145 v->header.signature[3] = 'T'; 146 147 /* there's features depending on version! */ 148 v->header.version = 155; 149 v->header.header_size = sizeof(v->header); 150 v->header.vbt_size = sizeof(struct vbt); 151 v->header.bdb_offset = offsetof(struct vbt, bdb_header); 152 153 strcpy(&v->bdb_header.signature[0], "BIOS_DATA_BLOCK"); 154 v->bdb_header.version = 186; /* child_dev_size = 33 */ 155 v->bdb_header.header_size = sizeof(v->bdb_header); 156 157 v->bdb_header.bdb_size = sizeof(struct vbt) - sizeof(struct vbt_header); 158 159 /* general features */ 160 v->general_features_header.id = BDB_GENERAL_FEATURES; 161 v->general_features_header.size = sizeof(struct bdb_general_features); 162 v->general_features.int_crt_support = 0; 163 v->general_features.int_tv_support = 0; 164 165 /* child device */ 166 num_child = 4; /* each port has one child */ 167 v->general_definitions.child_dev_size = 168 sizeof(struct efp_child_device_config); 169 v->general_definitions_header.id = BDB_GENERAL_DEFINITIONS; 170 /* size will include child devices */ 171 v->general_definitions_header.size = 172 sizeof(struct bdb_general_definitions) + 173 num_child * v->general_definitions.child_dev_size; 174 175 /* portA */ 176 v->child0.handle = DEVICE_TYPE_EFP1; 177 v->child0.device_type = DEVICE_TYPE_DP; 178 v->child0.dvo_port = DVO_PORT_DPA; 179 v->child0.aux_channel = DP_AUX_A; 180 v->child0.dp_compat = true; 181 v->child0.integrated_encoder = true; 182 183 /* portB */ 184 v->child1.handle = DEVICE_TYPE_EFP2; 185 v->child1.device_type = DEVICE_TYPE_DP; 186 v->child1.dvo_port = DVO_PORT_DPB; 187 v->child1.aux_channel = DP_AUX_B; 188 v->child1.dp_compat = true; 189 v->child1.integrated_encoder = true; 190 191 /* portC */ 192 v->child2.handle = DEVICE_TYPE_EFP3; 193 v->child2.device_type = DEVICE_TYPE_DP; 194 v->child2.dvo_port = DVO_PORT_DPC; 195 v->child2.aux_channel = DP_AUX_C; 196 v->child2.dp_compat = true; 197 v->child2.integrated_encoder = true; 198 199 /* portD */ 200 v->child3.handle = DEVICE_TYPE_EFP4; 201 v->child3.device_type = DEVICE_TYPE_DP; 202 v->child3.dvo_port = DVO_PORT_DPD; 203 v->child3.aux_channel = DP_AUX_D; 204 v->child3.dp_compat = true; 205 v->child3.integrated_encoder = true; 206 207 /* driver features */ 208 v->driver_features_header.id = BDB_DRIVER_FEATURES; 209 v->driver_features_header.size = sizeof(struct bdb_driver_features); 210 v->driver_features.lvds_config = BDB_DRIVER_FEATURE_NO_LVDS; 211 } 212 213 /** 214 * intel_vgpu_init_opregion - initialize the stuff used to emulate opregion 215 * @vgpu: a vGPU 216 * 217 * Returns: 218 * Zero on success, negative error code if failed. 219 */ 220 int intel_vgpu_init_opregion(struct intel_vgpu *vgpu) 221 { 222 u8 *buf; 223 struct opregion_header *header; 224 struct vbt v; 225 226 gvt_dbg_core("init vgpu%d opregion\n", vgpu->id); 227 vgpu_opregion(vgpu)->va = (void *)__get_free_pages(GFP_KERNEL | 228 __GFP_ZERO, 229 get_order(INTEL_GVT_OPREGION_SIZE)); 230 if (!vgpu_opregion(vgpu)->va) { 231 gvt_err("fail to get memory for vgpu virt opregion\n"); 232 return -ENOMEM; 233 } 234 235 /* emulated opregion with VBT mailbox only */ 236 buf = (u8 *)vgpu_opregion(vgpu)->va; 237 header = (struct opregion_header *)buf; 238 239 static_assert(sizeof(header->signature) == sizeof(OPREGION_SIGNATURE) - 1); 240 memcpy(header->signature, OPREGION_SIGNATURE, sizeof(header->signature)); 241 242 header->size = 0x8; 243 header->opregion_ver = 0x02000000; 244 header->mboxes = MBOX_VBT; 245 246 /* for unknown reason, the value in LID field is incorrect 247 * which block the windows guest, so workaround it by force 248 * setting it to "OPEN" 249 */ 250 buf[INTEL_GVT_OPREGION_CLID] = 0x3; 251 252 /* emulated vbt from virt vbt generation */ 253 virt_vbt_generation(&v); 254 memcpy(buf + INTEL_GVT_OPREGION_VBT_OFFSET, &v, sizeof(struct vbt)); 255 256 return 0; 257 } 258 259 /** 260 * intel_vgpu_opregion_base_write_handler - Opregion base register write handler 261 * 262 * @vgpu: a vGPU 263 * @gpa: guest physical address of opregion 264 * 265 * Returns: 266 * Zero on success, negative error code if failed. 267 */ 268 int intel_vgpu_opregion_base_write_handler(struct intel_vgpu *vgpu, u32 gpa) 269 { 270 271 int i; 272 273 gvt_dbg_core("emulate opregion from kernel\n"); 274 275 for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++) 276 vgpu_opregion(vgpu)->gfn[i] = (gpa >> PAGE_SHIFT) + i; 277 return 0; 278 } 279 280 /** 281 * intel_vgpu_clean_opregion - clean the stuff used to emulate opregion 282 * @vgpu: a vGPU 283 * 284 */ 285 void intel_vgpu_clean_opregion(struct intel_vgpu *vgpu) 286 { 287 gvt_dbg_core("vgpu%d: clean vgpu opregion\n", vgpu->id); 288 289 if (!vgpu_opregion(vgpu)->va) 290 return; 291 292 /* Guest opregion is released by VFIO */ 293 free_pages((unsigned long)vgpu_opregion(vgpu)->va, 294 get_order(INTEL_GVT_OPREGION_SIZE)); 295 296 vgpu_opregion(vgpu)->va = NULL; 297 298 } 299 300 301 #define GVT_OPREGION_FUNC(scic) \ 302 ({ \ 303 u32 __ret; \ 304 __ret = (scic & OPREGION_SCIC_FUNC_MASK) >> \ 305 OPREGION_SCIC_FUNC_SHIFT; \ 306 __ret; \ 307 }) 308 309 #define GVT_OPREGION_SUBFUNC(scic) \ 310 ({ \ 311 u32 __ret; \ 312 __ret = (scic & OPREGION_SCIC_SUBFUNC_MASK) >> \ 313 OPREGION_SCIC_SUBFUNC_SHIFT; \ 314 __ret; \ 315 }) 316 317 static const char *opregion_func_name(u32 func) 318 { 319 const char *name = NULL; 320 321 switch (func) { 322 case 0 ... 3: 323 case 5: 324 case 7 ... 15: 325 name = "Reserved"; 326 break; 327 328 case 4: 329 name = "Get BIOS Data"; 330 break; 331 332 case 6: 333 name = "System BIOS Callbacks"; 334 break; 335 336 default: 337 name = "Unknown"; 338 break; 339 } 340 return name; 341 } 342 343 static const char *opregion_subfunc_name(u32 subfunc) 344 { 345 const char *name = NULL; 346 347 switch (subfunc) { 348 case 0: 349 name = "Supported Calls"; 350 break; 351 352 case 1: 353 name = "Requested Callbacks"; 354 break; 355 356 case 2 ... 3: 357 case 8 ... 9: 358 name = "Reserved"; 359 break; 360 361 case 5: 362 name = "Boot Display"; 363 break; 364 365 case 6: 366 name = "TV-Standard/Video-Connector"; 367 break; 368 369 case 7: 370 name = "Internal Graphics"; 371 break; 372 373 case 10: 374 name = "Spread Spectrum Clocks"; 375 break; 376 377 case 11: 378 name = "Get AKSV"; 379 break; 380 381 default: 382 name = "Unknown"; 383 break; 384 } 385 return name; 386 }; 387 388 static bool querying_capabilities(u32 scic) 389 { 390 u32 func, subfunc; 391 392 func = GVT_OPREGION_FUNC(scic); 393 subfunc = GVT_OPREGION_SUBFUNC(scic); 394 395 if ((func == INTEL_GVT_OPREGION_SCIC_F_GETBIOSDATA && 396 subfunc == INTEL_GVT_OPREGION_SCIC_SF_SUPPRTEDCALLS) 397 || (func == INTEL_GVT_OPREGION_SCIC_F_GETBIOSDATA && 398 subfunc == INTEL_GVT_OPREGION_SCIC_SF_REQEUSTEDCALLBACKS) 399 || (func == INTEL_GVT_OPREGION_SCIC_F_GETBIOSCALLBACKS && 400 subfunc == INTEL_GVT_OPREGION_SCIC_SF_SUPPRTEDCALLS)) { 401 return true; 402 } 403 return false; 404 } 405 406 /** 407 * intel_vgpu_emulate_opregion_request - emulating OpRegion request 408 * @vgpu: a vGPU 409 * @swsci: SWSCI request 410 * 411 * Returns: 412 * Zero on success, negative error code if failed 413 */ 414 int intel_vgpu_emulate_opregion_request(struct intel_vgpu *vgpu, u32 swsci) 415 { 416 u32 scic, parm; 417 u32 func, subfunc; 418 u64 scic_pa = 0, parm_pa = 0; 419 int ret; 420 421 scic_pa = (vgpu_opregion(vgpu)->gfn[0] << PAGE_SHIFT) + 422 INTEL_GVT_OPREGION_SCIC; 423 parm_pa = (vgpu_opregion(vgpu)->gfn[0] << PAGE_SHIFT) + 424 INTEL_GVT_OPREGION_PARM; 425 ret = intel_gvt_read_gpa(vgpu, scic_pa, &scic, sizeof(scic)); 426 if (ret) { 427 gvt_vgpu_err("guest opregion read error %d, gpa 0x%llx, len %lu\n", 428 ret, scic_pa, sizeof(scic)); 429 return ret; 430 } 431 432 ret = intel_gvt_read_gpa(vgpu, parm_pa, &parm, sizeof(parm)); 433 if (ret) { 434 gvt_vgpu_err("guest opregion read error %d, gpa 0x%llx, len %lu\n", 435 ret, scic_pa, sizeof(scic)); 436 return ret; 437 } 438 439 if (!(swsci & SWSCI_SCI_SELECT)) { 440 gvt_vgpu_err("requesting SMI service\n"); 441 return 0; 442 } 443 /* ignore non 0->1 transitions */ 444 if ((vgpu_cfg_space(vgpu)[INTEL_GVT_PCI_SWSCI] 445 & SWSCI_SCI_TRIGGER) || 446 !(swsci & SWSCI_SCI_TRIGGER)) { 447 return 0; 448 } 449 450 func = GVT_OPREGION_FUNC(scic); 451 subfunc = GVT_OPREGION_SUBFUNC(scic); 452 if (!querying_capabilities(scic)) { 453 gvt_vgpu_err("requesting runtime service: func \"%s\"," 454 " subfunc \"%s\"\n", 455 opregion_func_name(func), 456 opregion_subfunc_name(subfunc)); 457 /* 458 * emulate exit status of function call, '0' means 459 * "failure, generic, unsupported or unknown cause" 460 */ 461 scic &= ~OPREGION_SCIC_EXIT_MASK; 462 goto out; 463 } 464 465 scic = 0; 466 parm = 0; 467 468 out: 469 ret = intel_gvt_write_gpa(vgpu, scic_pa, &scic, sizeof(scic)); 470 if (ret) { 471 gvt_vgpu_err("guest opregion write error %d, gpa 0x%llx, len %lu\n", 472 ret, scic_pa, sizeof(scic)); 473 return ret; 474 } 475 476 ret = intel_gvt_write_gpa(vgpu, parm_pa, &parm, sizeof(parm)); 477 if (ret) { 478 gvt_vgpu_err("guest opregion write error %d, gpa 0x%llx, len %lu\n", 479 ret, scic_pa, sizeof(scic)); 480 return ret; 481 } 482 483 return 0; 484 } 485