1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2013-2023, Intel Corporation. All rights reserved. 4 * Intel Management Engine Interface (Intel MEI) Linux driver 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/sched.h> 9 #include <linux/module.h> 10 #include <linux/device.h> 11 #include <linux/slab.h> 12 13 #include <linux/mei.h> 14 #include <linux/mei_cl_bus.h> 15 16 #include "mei_dev.h" 17 #include "client.h" 18 #include "mkhi.h" 19 20 #define MEI_UUID_NFC_INFO UUID_LE(0xd2de1625, 0x382d, 0x417d, \ 21 0x48, 0xa4, 0xef, 0xab, 0xba, 0x8a, 0x12, 0x06) 22 23 static const uuid_le mei_nfc_info_guid = MEI_UUID_NFC_INFO; 24 25 #define MEI_UUID_NFC_HCI UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50, \ 26 0x94, 0xd4, 0x50, 0x26, 0x67, 0x23, 0x77, 0x5c) 27 28 #define MEI_UUID_WD UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, \ 29 0x89, 0x9D, 0xA9, 0x15, 0x14, 0xCB, 0x32, 0xAB) 30 31 #define MEI_UUID_MKHIF_FIX UUID_LE(0x55213584, 0x9a29, 0x4916, \ 32 0xba, 0xdf, 0xf, 0xb7, 0xed, 0x68, 0x2a, 0xeb) 33 34 #define MEI_UUID_IGSC_MKHI UUID_LE(0xE2C2AFA2, 0x3817, 0x4D19, \ 35 0x9D, 0x95, 0x06, 0xB1, 0x6B, 0x58, 0x8A, 0x5D) 36 37 #define MEI_UUID_IGSC_MKHI_FIX UUID_LE(0x46E0C1FB, 0xA546, 0x414F, \ 38 0x91, 0x70, 0xB7, 0xF4, 0x6D, 0x57, 0xB4, 0xAD) 39 40 #define MEI_UUID_HDCP UUID_LE(0xB638AB7E, 0x94E2, 0x4EA2, \ 41 0xA5, 0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04) 42 43 #define MEI_UUID_PAVP UUID_LE(0xfbf6fcf1, 0x96cf, 0x4e2e, 0xA6, \ 44 0xa6, 0x1b, 0xab, 0x8c, 0xbe, 0x36, 0xb1) 45 46 #define MEI_UUID_ANY NULL_UUID_LE 47 48 /** 49 * number_of_connections - determine whether an client be on the bus 50 * according number of connections 51 * We support only clients: 52 * 1. with single connection 53 * 2. and fixed clients (max_number_of_connections == 0) 54 * 55 * @cldev: me clients device 56 */ 57 static void number_of_connections(struct mei_cl_device *cldev) 58 { 59 if (cldev->me_cl->props.max_number_of_connections > 1) 60 cldev->do_match = 0; 61 } 62 63 /** 64 * blacklist - blacklist a client from the bus 65 * 66 * @cldev: me clients device 67 */ 68 static void blacklist(struct mei_cl_device *cldev) 69 { 70 cldev->do_match = 0; 71 } 72 73 /** 74 * whitelist - forcefully whitelist client 75 * 76 * @cldev: me clients device 77 */ 78 static void whitelist(struct mei_cl_device *cldev) 79 { 80 cldev->do_match = 1; 81 } 82 83 #define OSTYPE_LINUX 2 84 struct mei_os_ver { 85 __le16 build; 86 __le16 reserved1; 87 u8 os_type; 88 u8 major; 89 u8 minor; 90 u8 reserved2; 91 } __packed; 92 93 struct mkhi_fw_ver_block { 94 u16 minor; 95 u8 major; 96 u8 platform; 97 u16 buildno; 98 u16 hotfix; 99 } __packed; 100 101 struct mkhi_fw_ver { 102 struct mkhi_fw_ver_block ver[MEI_MAX_FW_VER_BLOCKS]; 103 } __packed; 104 105 #define MKHI_OSVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \ 106 sizeof(struct mkhi_fwcaps) + \ 107 sizeof(struct mei_os_ver)) 108 static int mei_osver(struct mei_cl_device *cldev) 109 { 110 const size_t size = MKHI_OSVER_BUF_LEN; 111 u8 buf[MKHI_OSVER_BUF_LEN]; 112 struct mkhi_msg *req; 113 struct mkhi_fwcaps *fwcaps; 114 struct mei_os_ver *os_ver; 115 unsigned int mode = MEI_CL_IO_TX_BLOCKING | MEI_CL_IO_TX_INTERNAL; 116 117 memset(buf, 0, size); 118 119 req = (struct mkhi_msg *)buf; 120 req->hdr.group_id = MKHI_FWCAPS_GROUP_ID; 121 req->hdr.command = MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD; 122 123 fwcaps = (struct mkhi_fwcaps *)req->data; 124 125 fwcaps->id.rule_type = 0x0; 126 fwcaps->id.feature_id = MKHI_FEATURE_PTT; 127 fwcaps->len = sizeof(*os_ver); 128 os_ver = (struct mei_os_ver *)fwcaps->data; 129 os_ver->os_type = OSTYPE_LINUX; 130 131 return __mei_cl_send(cldev->cl, buf, size, 0, mode); 132 } 133 134 #define MKHI_FWVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \ 135 sizeof(struct mkhi_fw_ver)) 136 #define MKHI_FWVER_LEN(__num) (sizeof(struct mkhi_msg_hdr) + \ 137 sizeof(struct mkhi_fw_ver_block) * (__num)) 138 static int mei_fwver(struct mei_cl_device *cldev) 139 { 140 u8 buf[MKHI_FWVER_BUF_LEN]; 141 struct mkhi_msg req; 142 struct mkhi_msg *rsp; 143 struct mkhi_fw_ver *fwver; 144 int bytes_recv, ret, i; 145 146 memset(buf, 0, sizeof(buf)); 147 148 req.hdr.group_id = MKHI_GEN_GROUP_ID; 149 req.hdr.command = MKHI_GEN_GET_FW_VERSION_CMD; 150 151 ret = __mei_cl_send(cldev->cl, (u8 *)&req, sizeof(req), 0, 152 MEI_CL_IO_TX_BLOCKING); 153 if (ret < 0) { 154 dev_info(&cldev->dev, "Could not send ReqFWVersion cmd ret = %d\n", ret); 155 return ret; 156 } 157 158 ret = 0; 159 bytes_recv = __mei_cl_recv(cldev->cl, buf, sizeof(buf), NULL, 0, 160 cldev->bus->timeouts.mkhi_recv); 161 if (bytes_recv < 0 || (size_t)bytes_recv < MKHI_FWVER_LEN(1)) { 162 /* 163 * Should be at least one version block, 164 * error out if nothing found 165 */ 166 dev_info(&cldev->dev, "Could not read FW version ret = %d\n", bytes_recv); 167 return -EIO; 168 } 169 170 rsp = (struct mkhi_msg *)buf; 171 fwver = (struct mkhi_fw_ver *)rsp->data; 172 memset(cldev->bus->fw_ver, 0, sizeof(cldev->bus->fw_ver)); 173 for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++) { 174 if ((size_t)bytes_recv < MKHI_FWVER_LEN(i + 1)) 175 break; 176 dev_dbg(&cldev->dev, "FW version%d %d:%d.%d.%d.%d\n", 177 i, fwver->ver[i].platform, 178 fwver->ver[i].major, fwver->ver[i].minor, 179 fwver->ver[i].hotfix, fwver->ver[i].buildno); 180 181 cldev->bus->fw_ver[i].platform = fwver->ver[i].platform; 182 cldev->bus->fw_ver[i].major = fwver->ver[i].major; 183 cldev->bus->fw_ver[i].minor = fwver->ver[i].minor; 184 cldev->bus->fw_ver[i].hotfix = fwver->ver[i].hotfix; 185 cldev->bus->fw_ver[i].buildno = fwver->ver[i].buildno; 186 } 187 cldev->bus->fw_ver_received = 1; 188 189 return ret; 190 } 191 192 #define GFX_MEMORY_READY_TIMEOUT 200 /* timeout in milliseconds */ 193 194 static int mei_gfx_memory_ready(struct mei_cl_device *cldev) 195 { 196 struct mkhi_gfx_mem_ready req = {0}; 197 unsigned int mode = MEI_CL_IO_TX_INTERNAL | MEI_CL_IO_TX_BLOCKING; 198 199 req.hdr.group_id = MKHI_GROUP_ID_GFX; 200 req.hdr.command = MKHI_GFX_MEMORY_READY_CMD_REQ; 201 req.flags = MKHI_GFX_MEM_READY_PXP_ALLOWED; 202 203 dev_dbg(&cldev->dev, "Sending memory ready command\n"); 204 return __mei_cl_send_timeout(cldev->cl, (u8 *)&req, sizeof(req), 0, 205 mode, GFX_MEMORY_READY_TIMEOUT); 206 } 207 208 static void mei_mkhi_fix(struct mei_cl_device *cldev) 209 { 210 int ret; 211 212 /* No need to enable the client if nothing is needed from it */ 213 if (!cldev->bus->fw_f_fw_ver_supported && 214 !cldev->bus->hbm_f_os_supported) 215 return; 216 217 ret = mei_cldev_enable(cldev); 218 if (ret) 219 return; 220 221 if (cldev->bus->fw_f_fw_ver_supported) { 222 ret = mei_fwver(cldev); 223 if (ret < 0) 224 dev_info(&cldev->dev, "FW version command failed %d\n", 225 ret); 226 } 227 228 if (cldev->bus->hbm_f_os_supported) { 229 ret = mei_osver(cldev); 230 if (ret < 0) 231 dev_info(&cldev->dev, "OS version command failed %d\n", 232 ret); 233 } 234 mei_cldev_disable(cldev); 235 } 236 237 static void mei_gsc_mkhi_ver(struct mei_cl_device *cldev) 238 { 239 int ret; 240 241 /* 242 * No need to enable the client if nothing is needed from it. 243 * No need to fill in version if it is already filled in by the fix address client. 244 */ 245 if (!cldev->bus->fw_f_fw_ver_supported || cldev->bus->fw_ver_received) 246 return; 247 248 ret = mei_cldev_enable(cldev); 249 if (ret) 250 return; 251 252 ret = mei_fwver(cldev); 253 if (ret < 0) 254 dev_info(&cldev->dev, "FW version command failed %d\n", ret); 255 mei_cldev_disable(cldev); 256 } 257 258 static void mei_gsc_mkhi_fix_ver(struct mei_cl_device *cldev) 259 { 260 int ret; 261 262 /* No need to enable the client if nothing is needed from it */ 263 if (!cldev->bus->fw_f_fw_ver_supported && 264 cldev->bus->pxp_mode != MEI_DEV_PXP_INIT) 265 return; 266 267 ret = mei_cldev_enable(cldev); 268 if (ret) 269 return; 270 271 if (cldev->bus->pxp_mode == MEI_DEV_PXP_INIT) { 272 ret = mei_gfx_memory_ready(cldev); 273 if (ret < 0) { 274 dev_err(&cldev->dev, "memory ready command failed %d\n", ret); 275 } else { 276 dev_dbg(&cldev->dev, "memory ready command sent\n"); 277 cldev->bus->pxp_mode = MEI_DEV_PXP_SETUP; 278 } 279 /* we go to reset after that */ 280 goto out; 281 } 282 283 ret = mei_fwver(cldev); 284 if (ret < 0) 285 dev_info(&cldev->dev, "FW version command failed %d\n", 286 ret); 287 out: 288 mei_cldev_disable(cldev); 289 } 290 291 /** 292 * mei_wd - wd client on the bus, change protocol version 293 * as the API has changed. 294 * 295 * @cldev: me clients device 296 */ 297 #if IS_ENABLED(CONFIG_INTEL_MEI_ME) 298 #include <linux/pci.h> 299 #include "hw-me-regs.h" 300 static void mei_wd(struct mei_cl_device *cldev) 301 { 302 struct pci_dev *pdev = to_pci_dev(cldev->dev.parent); 303 304 if (pdev->device == MEI_DEV_ID_WPT_LP || 305 pdev->device == MEI_DEV_ID_SPT || 306 pdev->device == MEI_DEV_ID_SPT_H) 307 cldev->me_cl->props.protocol_version = 0x2; 308 309 cldev->do_match = 1; 310 } 311 #else 312 static inline void mei_wd(struct mei_cl_device *cldev) {} 313 #endif /* CONFIG_INTEL_MEI_ME */ 314 315 struct mei_nfc_cmd { 316 u8 command; 317 u8 status; 318 u16 req_id; 319 u32 reserved; 320 u16 data_size; 321 u8 sub_command; 322 u8 data[]; 323 } __packed; 324 325 struct mei_nfc_reply { 326 u8 command; 327 u8 status; 328 u16 req_id; 329 u32 reserved; 330 u16 data_size; 331 u8 sub_command; 332 u8 reply_status; 333 u8 data[]; 334 } __packed; 335 336 struct mei_nfc_if_version { 337 u8 radio_version_sw[3]; 338 u8 reserved[3]; 339 u8 radio_version_hw[3]; 340 u8 i2c_addr; 341 u8 fw_ivn; 342 u8 vendor_id; 343 u8 radio_type; 344 } __packed; 345 346 347 #define MEI_NFC_CMD_MAINTENANCE 0x00 348 #define MEI_NFC_SUBCMD_IF_VERSION 0x01 349 350 /* Vendors */ 351 #define MEI_NFC_VENDOR_INSIDE 0x00 352 #define MEI_NFC_VENDOR_NXP 0x01 353 354 /* Radio types */ 355 #define MEI_NFC_VENDOR_INSIDE_UREAD 0x00 356 #define MEI_NFC_VENDOR_NXP_PN544 0x01 357 358 /** 359 * mei_nfc_if_version - get NFC interface version 360 * 361 * @cl: host client (nfc info) 362 * @ver: NFC interface version to be filled in 363 * 364 * Return: 0 on success; < 0 otherwise 365 */ 366 static int mei_nfc_if_version(struct mei_cl *cl, 367 struct mei_nfc_if_version *ver) 368 { 369 struct mei_device *bus; 370 struct mei_nfc_cmd cmd = { 371 .command = MEI_NFC_CMD_MAINTENANCE, 372 .data_size = 1, 373 .sub_command = MEI_NFC_SUBCMD_IF_VERSION, 374 }; 375 struct mei_nfc_reply *reply = NULL; 376 size_t if_version_length; 377 u8 vtag; 378 int bytes_recv, ret; 379 380 bus = cl->dev; 381 382 WARN_ON(mutex_is_locked(&bus->device_lock)); 383 384 ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(cmd), 0, 385 MEI_CL_IO_TX_BLOCKING); 386 if (ret < 0) { 387 dev_err(bus->dev, "Could not send IF version cmd ret = %d\n", ret); 388 return ret; 389 } 390 391 /* to be sure on the stack we alloc memory */ 392 if_version_length = sizeof(*reply) + sizeof(*ver); 393 394 reply = kzalloc(if_version_length, GFP_KERNEL); 395 if (!reply) 396 return -ENOMEM; 397 398 ret = 0; 399 bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length, &vtag, 400 0, 0); 401 if (bytes_recv < 0 || (size_t)bytes_recv < if_version_length) { 402 dev_err(bus->dev, "Could not read IF version ret = %d\n", bytes_recv); 403 ret = -EIO; 404 goto err; 405 } 406 407 memcpy(ver, reply->data, sizeof(*ver)); 408 409 dev_info(bus->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n", 410 ver->fw_ivn, ver->vendor_id, ver->radio_type); 411 412 err: 413 kfree(reply); 414 return ret; 415 } 416 417 /** 418 * mei_nfc_radio_name - derive nfc radio name from the interface version 419 * 420 * @ver: NFC radio version 421 * 422 * Return: radio name string 423 */ 424 static const char *mei_nfc_radio_name(struct mei_nfc_if_version *ver) 425 { 426 427 if (ver->vendor_id == MEI_NFC_VENDOR_INSIDE) { 428 if (ver->radio_type == MEI_NFC_VENDOR_INSIDE_UREAD) 429 return "microread"; 430 } 431 432 if (ver->vendor_id == MEI_NFC_VENDOR_NXP) { 433 if (ver->radio_type == MEI_NFC_VENDOR_NXP_PN544) 434 return "pn544"; 435 } 436 437 return NULL; 438 } 439 440 /** 441 * mei_nfc - The nfc fixup function. The function retrieves nfc radio 442 * name and set is as device attribute so we can load 443 * the proper device driver for it 444 * 445 * @cldev: me client device (nfc) 446 */ 447 static void mei_nfc(struct mei_cl_device *cldev) 448 { 449 struct mei_device *bus; 450 struct mei_cl *cl; 451 struct mei_me_client *me_cl = NULL; 452 struct mei_nfc_if_version ver; 453 const char *radio_name = NULL; 454 int ret; 455 456 bus = cldev->bus; 457 458 mutex_lock(&bus->device_lock); 459 /* we need to connect to INFO GUID */ 460 cl = mei_cl_alloc_linked(bus); 461 if (IS_ERR(cl)) { 462 ret = PTR_ERR(cl); 463 cl = NULL; 464 dev_err(bus->dev, "nfc hook alloc failed %d\n", ret); 465 goto out; 466 } 467 468 me_cl = mei_me_cl_by_uuid(bus, &mei_nfc_info_guid); 469 if (!me_cl) { 470 ret = -ENOTTY; 471 dev_err(bus->dev, "Cannot find nfc info %d\n", ret); 472 goto out; 473 } 474 475 ret = mei_cl_connect(cl, me_cl, NULL); 476 if (ret < 0) { 477 dev_err(&cldev->dev, "Can't connect to the NFC INFO ME ret = %d\n", 478 ret); 479 goto out; 480 } 481 482 mutex_unlock(&bus->device_lock); 483 484 ret = mei_nfc_if_version(cl, &ver); 485 if (ret) 486 goto disconnect; 487 488 radio_name = mei_nfc_radio_name(&ver); 489 490 if (!radio_name) { 491 ret = -ENOENT; 492 dev_err(&cldev->dev, "Can't get the NFC interface version ret = %d\n", 493 ret); 494 goto disconnect; 495 } 496 497 dev_dbg(bus->dev, "nfc radio %s\n", radio_name); 498 strscpy(cldev->name, radio_name, sizeof(cldev->name)); 499 500 disconnect: 501 mutex_lock(&bus->device_lock); 502 if (mei_cl_disconnect(cl) < 0) 503 dev_err(bus->dev, "Can't disconnect the NFC INFO ME\n"); 504 505 mei_cl_flush_queues(cl, NULL); 506 507 out: 508 mei_cl_unlink(cl); 509 mutex_unlock(&bus->device_lock); 510 mei_me_cl_put(me_cl); 511 kfree(cl); 512 513 if (ret) 514 cldev->do_match = 0; 515 516 dev_dbg(bus->dev, "end of fixup match = %d\n", cldev->do_match); 517 } 518 519 /** 520 * vt_support - enable on bus clients with vtag support 521 * 522 * @cldev: me clients device 523 */ 524 static void vt_support(struct mei_cl_device *cldev) 525 { 526 if (cldev->me_cl->props.vt_supported == 1) 527 cldev->do_match = 1; 528 } 529 530 /** 531 * pxp_is_ready - enable bus client if pxp is ready 532 * 533 * @cldev: me clients device 534 */ 535 static void pxp_is_ready(struct mei_cl_device *cldev) 536 { 537 struct mei_device *bus = cldev->bus; 538 539 switch (bus->pxp_mode) { 540 case MEI_DEV_PXP_READY: 541 case MEI_DEV_PXP_DEFAULT: 542 cldev->do_match = 1; 543 break; 544 default: 545 cldev->do_match = 0; 546 break; 547 } 548 } 549 550 #define MEI_FIXUP(_uuid, _hook) { _uuid, _hook } 551 552 static struct mei_fixup { 553 554 const uuid_le uuid; 555 void (*hook)(struct mei_cl_device *cldev); 556 } mei_fixups[] = { 557 MEI_FIXUP(MEI_UUID_ANY, number_of_connections), 558 MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist), 559 MEI_FIXUP(MEI_UUID_NFC_HCI, mei_nfc), 560 MEI_FIXUP(MEI_UUID_WD, mei_wd), 561 MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix), 562 MEI_FIXUP(MEI_UUID_IGSC_MKHI_FIX, mei_gsc_mkhi_fix_ver), 563 MEI_FIXUP(MEI_UUID_IGSC_MKHI, mei_gsc_mkhi_ver), 564 MEI_FIXUP(MEI_UUID_HDCP, whitelist), 565 MEI_FIXUP(MEI_UUID_ANY, vt_support), 566 MEI_FIXUP(MEI_UUID_PAVP, pxp_is_ready), 567 }; 568 569 /** 570 * mei_cl_bus_dev_fixup - run fixup handlers 571 * 572 * @cldev: me client device 573 */ 574 void mei_cl_bus_dev_fixup(struct mei_cl_device *cldev) 575 { 576 struct mei_fixup *f; 577 const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl); 578 size_t i; 579 580 for (i = 0; i < ARRAY_SIZE(mei_fixups); i++) { 581 582 f = &mei_fixups[i]; 583 if (uuid_le_cmp(f->uuid, MEI_UUID_ANY) == 0 || 584 uuid_le_cmp(f->uuid, *uuid) == 0) 585 f->hook(cldev); 586 } 587 } 588 589