1 /* 2 * 3 * Intel Management Engine Interface (Intel MEI) Linux driver 4 * Copyright (c) 2003-2012, Intel Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 */ 16 17 #include <linux/pci.h> 18 19 #include <linux/kthread.h> 20 #include <linux/interrupt.h> 21 #include <linux/pm_runtime.h> 22 23 #include "mei_dev.h" 24 #include "hbm.h" 25 26 #include "hw-me.h" 27 #include "hw-me-regs.h" 28 29 #include "mei-trace.h" 30 31 /** 32 * mei_me_reg_read - Reads 32bit data from the mei device 33 * 34 * @hw: the me hardware structure 35 * @offset: offset from which to read the data 36 * 37 * Return: register value (u32) 38 */ 39 static inline u32 mei_me_reg_read(const struct mei_me_hw *hw, 40 unsigned long offset) 41 { 42 return ioread32(hw->mem_addr + offset); 43 } 44 45 46 /** 47 * mei_me_reg_write - Writes 32bit data to the mei device 48 * 49 * @hw: the me hardware structure 50 * @offset: offset from which to write the data 51 * @value: register value to write (u32) 52 */ 53 static inline void mei_me_reg_write(const struct mei_me_hw *hw, 54 unsigned long offset, u32 value) 55 { 56 iowrite32(value, hw->mem_addr + offset); 57 } 58 59 /** 60 * mei_me_mecbrw_read - Reads 32bit data from ME circular buffer 61 * read window register 62 * 63 * @dev: the device structure 64 * 65 * Return: ME_CB_RW register value (u32) 66 */ 67 static inline u32 mei_me_mecbrw_read(const struct mei_device *dev) 68 { 69 return mei_me_reg_read(to_me_hw(dev), ME_CB_RW); 70 } 71 72 /** 73 * mei_me_hcbww_write - write 32bit data to the host circular buffer 74 * 75 * @dev: the device structure 76 * @data: 32bit data to be written to the host circular buffer 77 */ 78 static inline void mei_me_hcbww_write(struct mei_device *dev, u32 data) 79 { 80 mei_me_reg_write(to_me_hw(dev), H_CB_WW, data); 81 } 82 83 /** 84 * mei_me_mecsr_read - Reads 32bit data from the ME CSR 85 * 86 * @dev: the device structure 87 * 88 * Return: ME_CSR_HA register value (u32) 89 */ 90 static inline u32 mei_me_mecsr_read(const struct mei_device *dev) 91 { 92 u32 reg; 93 94 reg = mei_me_reg_read(to_me_hw(dev), ME_CSR_HA); 95 trace_mei_reg_read(dev->dev, "ME_CSR_HA", ME_CSR_HA, reg); 96 97 return reg; 98 } 99 100 /** 101 * mei_hcsr_read - Reads 32bit data from the host CSR 102 * 103 * @dev: the device structure 104 * 105 * Return: H_CSR register value (u32) 106 */ 107 static inline u32 mei_hcsr_read(const struct mei_device *dev) 108 { 109 u32 reg; 110 111 reg = mei_me_reg_read(to_me_hw(dev), H_CSR); 112 trace_mei_reg_read(dev->dev, "H_CSR", H_CSR, reg); 113 114 return reg; 115 } 116 117 /** 118 * mei_hcsr_write - writes H_CSR register to the mei device 119 * 120 * @dev: the device structure 121 * @reg: new register value 122 */ 123 static inline void mei_hcsr_write(struct mei_device *dev, u32 reg) 124 { 125 trace_mei_reg_write(dev->dev, "H_CSR", H_CSR, reg); 126 mei_me_reg_write(to_me_hw(dev), H_CSR, reg); 127 } 128 129 /** 130 * mei_hcsr_set - writes H_CSR register to the mei device, 131 * and ignores the H_IS bit for it is write-one-to-zero. 132 * 133 * @dev: the device structure 134 * @reg: new register value 135 */ 136 static inline void mei_hcsr_set(struct mei_device *dev, u32 reg) 137 { 138 reg &= ~H_CSR_IS_MASK; 139 mei_hcsr_write(dev, reg); 140 } 141 142 /** 143 * mei_hcsr_set_hig - set host interrupt (set H_IG) 144 * 145 * @dev: the device structure 146 */ 147 static inline void mei_hcsr_set_hig(struct mei_device *dev) 148 { 149 u32 hcsr; 150 151 hcsr = mei_hcsr_read(dev) | H_IG; 152 mei_hcsr_set(dev, hcsr); 153 } 154 155 /** 156 * mei_me_d0i3c_read - Reads 32bit data from the D0I3C register 157 * 158 * @dev: the device structure 159 * 160 * Return: H_D0I3C register value (u32) 161 */ 162 static inline u32 mei_me_d0i3c_read(const struct mei_device *dev) 163 { 164 u32 reg; 165 166 reg = mei_me_reg_read(to_me_hw(dev), H_D0I3C); 167 trace_mei_reg_read(dev->dev, "H_D0I3C", H_D0I3C, reg); 168 169 return reg; 170 } 171 172 /** 173 * mei_me_d0i3c_write - writes H_D0I3C register to device 174 * 175 * @dev: the device structure 176 * @reg: new register value 177 */ 178 static inline void mei_me_d0i3c_write(struct mei_device *dev, u32 reg) 179 { 180 trace_mei_reg_write(dev->dev, "H_D0I3C", H_D0I3C, reg); 181 mei_me_reg_write(to_me_hw(dev), H_D0I3C, reg); 182 } 183 184 /** 185 * mei_me_fw_status - read fw status register from pci config space 186 * 187 * @dev: mei device 188 * @fw_status: fw status register values 189 * 190 * Return: 0 on success, error otherwise 191 */ 192 static int mei_me_fw_status(struct mei_device *dev, 193 struct mei_fw_status *fw_status) 194 { 195 struct pci_dev *pdev = to_pci_dev(dev->dev); 196 struct mei_me_hw *hw = to_me_hw(dev); 197 const struct mei_fw_status *fw_src = &hw->cfg->fw_status; 198 int ret; 199 int i; 200 201 if (!fw_status) 202 return -EINVAL; 203 204 fw_status->count = fw_src->count; 205 for (i = 0; i < fw_src->count && i < MEI_FW_STATUS_MAX; i++) { 206 ret = pci_read_config_dword(pdev, fw_src->status[i], 207 &fw_status->status[i]); 208 trace_mei_pci_cfg_read(dev->dev, "PCI_CFG_HSF_X", 209 fw_src->status[i], 210 fw_status->status[i]); 211 if (ret) 212 return ret; 213 } 214 215 return 0; 216 } 217 218 /** 219 * mei_me_hw_config - configure hw dependent settings 220 * 221 * @dev: mei device 222 */ 223 static void mei_me_hw_config(struct mei_device *dev) 224 { 225 struct pci_dev *pdev = to_pci_dev(dev->dev); 226 struct mei_me_hw *hw = to_me_hw(dev); 227 u32 hcsr, reg; 228 229 /* Doesn't change in runtime */ 230 hcsr = mei_hcsr_read(dev); 231 dev->hbuf_depth = (hcsr & H_CBD) >> 24; 232 233 reg = 0; 234 pci_read_config_dword(pdev, PCI_CFG_HFS_1, ®); 235 trace_mei_pci_cfg_read(dev->dev, "PCI_CFG_HFS_1", PCI_CFG_HFS_1, reg); 236 hw->d0i3_supported = 237 ((reg & PCI_CFG_HFS_1_D0I3_MSK) == PCI_CFG_HFS_1_D0I3_MSK); 238 239 hw->pg_state = MEI_PG_OFF; 240 if (hw->d0i3_supported) { 241 reg = mei_me_d0i3c_read(dev); 242 if (reg & H_D0I3C_I3) 243 hw->pg_state = MEI_PG_ON; 244 } 245 } 246 247 /** 248 * mei_me_pg_state - translate internal pg state 249 * to the mei power gating state 250 * 251 * @dev: mei device 252 * 253 * Return: MEI_PG_OFF if aliveness is on and MEI_PG_ON otherwise 254 */ 255 static inline enum mei_pg_state mei_me_pg_state(struct mei_device *dev) 256 { 257 struct mei_me_hw *hw = to_me_hw(dev); 258 259 return hw->pg_state; 260 } 261 262 static inline u32 me_intr_src(u32 hcsr) 263 { 264 return hcsr & H_CSR_IS_MASK; 265 } 266 267 /** 268 * me_intr_disable - disables mei device interrupts 269 * using supplied hcsr register value. 270 * 271 * @dev: the device structure 272 * @hcsr: supplied hcsr register value 273 */ 274 static inline void me_intr_disable(struct mei_device *dev, u32 hcsr) 275 { 276 hcsr &= ~H_CSR_IE_MASK; 277 mei_hcsr_set(dev, hcsr); 278 } 279 280 /** 281 * mei_me_intr_clear - clear and stop interrupts 282 * 283 * @dev: the device structure 284 * @hcsr: supplied hcsr register value 285 */ 286 static inline void me_intr_clear(struct mei_device *dev, u32 hcsr) 287 { 288 if (me_intr_src(hcsr)) 289 mei_hcsr_write(dev, hcsr); 290 } 291 292 /** 293 * mei_me_intr_clear - clear and stop interrupts 294 * 295 * @dev: the device structure 296 */ 297 static void mei_me_intr_clear(struct mei_device *dev) 298 { 299 u32 hcsr = mei_hcsr_read(dev); 300 301 me_intr_clear(dev, hcsr); 302 } 303 /** 304 * mei_me_intr_enable - enables mei device interrupts 305 * 306 * @dev: the device structure 307 */ 308 static void mei_me_intr_enable(struct mei_device *dev) 309 { 310 u32 hcsr = mei_hcsr_read(dev); 311 312 hcsr |= H_CSR_IE_MASK; 313 mei_hcsr_set(dev, hcsr); 314 } 315 316 /** 317 * mei_me_intr_disable - disables mei device interrupts 318 * 319 * @dev: the device structure 320 */ 321 static void mei_me_intr_disable(struct mei_device *dev) 322 { 323 u32 hcsr = mei_hcsr_read(dev); 324 325 me_intr_disable(dev, hcsr); 326 } 327 328 /** 329 * mei_me_synchronize_irq - wait for pending IRQ handlers 330 * 331 * @dev: the device structure 332 */ 333 static void mei_me_synchronize_irq(struct mei_device *dev) 334 { 335 struct pci_dev *pdev = to_pci_dev(dev->dev); 336 337 synchronize_irq(pdev->irq); 338 } 339 340 /** 341 * mei_me_hw_reset_release - release device from the reset 342 * 343 * @dev: the device structure 344 */ 345 static void mei_me_hw_reset_release(struct mei_device *dev) 346 { 347 u32 hcsr = mei_hcsr_read(dev); 348 349 hcsr |= H_IG; 350 hcsr &= ~H_RST; 351 mei_hcsr_set(dev, hcsr); 352 353 /* complete this write before we set host ready on another CPU */ 354 mmiowb(); 355 } 356 357 /** 358 * mei_me_host_set_ready - enable device 359 * 360 * @dev: mei device 361 */ 362 static void mei_me_host_set_ready(struct mei_device *dev) 363 { 364 u32 hcsr = mei_hcsr_read(dev); 365 366 hcsr |= H_CSR_IE_MASK | H_IG | H_RDY; 367 mei_hcsr_set(dev, hcsr); 368 } 369 370 /** 371 * mei_me_host_is_ready - check whether the host has turned ready 372 * 373 * @dev: mei device 374 * Return: bool 375 */ 376 static bool mei_me_host_is_ready(struct mei_device *dev) 377 { 378 u32 hcsr = mei_hcsr_read(dev); 379 380 return (hcsr & H_RDY) == H_RDY; 381 } 382 383 /** 384 * mei_me_hw_is_ready - check whether the me(hw) has turned ready 385 * 386 * @dev: mei device 387 * Return: bool 388 */ 389 static bool mei_me_hw_is_ready(struct mei_device *dev) 390 { 391 u32 mecsr = mei_me_mecsr_read(dev); 392 393 return (mecsr & ME_RDY_HRA) == ME_RDY_HRA; 394 } 395 396 /** 397 * mei_me_hw_is_resetting - check whether the me(hw) is in reset 398 * 399 * @dev: mei device 400 * Return: bool 401 */ 402 static bool mei_me_hw_is_resetting(struct mei_device *dev) 403 { 404 u32 mecsr = mei_me_mecsr_read(dev); 405 406 return (mecsr & ME_RST_HRA) == ME_RST_HRA; 407 } 408 409 /** 410 * mei_me_hw_ready_wait - wait until the me(hw) has turned ready 411 * or timeout is reached 412 * 413 * @dev: mei device 414 * Return: 0 on success, error otherwise 415 */ 416 static int mei_me_hw_ready_wait(struct mei_device *dev) 417 { 418 mutex_unlock(&dev->device_lock); 419 wait_event_timeout(dev->wait_hw_ready, 420 dev->recvd_hw_ready, 421 mei_secs_to_jiffies(MEI_HW_READY_TIMEOUT)); 422 mutex_lock(&dev->device_lock); 423 if (!dev->recvd_hw_ready) { 424 dev_err(dev->dev, "wait hw ready failed\n"); 425 return -ETIME; 426 } 427 428 mei_me_hw_reset_release(dev); 429 dev->recvd_hw_ready = false; 430 return 0; 431 } 432 433 /** 434 * mei_me_hw_start - hw start routine 435 * 436 * @dev: mei device 437 * Return: 0 on success, error otherwise 438 */ 439 static int mei_me_hw_start(struct mei_device *dev) 440 { 441 int ret = mei_me_hw_ready_wait(dev); 442 443 if (ret) 444 return ret; 445 dev_dbg(dev->dev, "hw is ready\n"); 446 447 mei_me_host_set_ready(dev); 448 return ret; 449 } 450 451 452 /** 453 * mei_hbuf_filled_slots - gets number of device filled buffer slots 454 * 455 * @dev: the device structure 456 * 457 * Return: number of filled slots 458 */ 459 static unsigned char mei_hbuf_filled_slots(struct mei_device *dev) 460 { 461 u32 hcsr; 462 char read_ptr, write_ptr; 463 464 hcsr = mei_hcsr_read(dev); 465 466 read_ptr = (char) ((hcsr & H_CBRP) >> 8); 467 write_ptr = (char) ((hcsr & H_CBWP) >> 16); 468 469 return (unsigned char) (write_ptr - read_ptr); 470 } 471 472 /** 473 * mei_me_hbuf_is_empty - checks if host buffer is empty. 474 * 475 * @dev: the device structure 476 * 477 * Return: true if empty, false - otherwise. 478 */ 479 static bool mei_me_hbuf_is_empty(struct mei_device *dev) 480 { 481 return mei_hbuf_filled_slots(dev) == 0; 482 } 483 484 /** 485 * mei_me_hbuf_empty_slots - counts write empty slots. 486 * 487 * @dev: the device structure 488 * 489 * Return: -EOVERFLOW if overflow, otherwise empty slots count 490 */ 491 static int mei_me_hbuf_empty_slots(struct mei_device *dev) 492 { 493 unsigned char filled_slots, empty_slots; 494 495 filled_slots = mei_hbuf_filled_slots(dev); 496 empty_slots = dev->hbuf_depth - filled_slots; 497 498 /* check for overflow */ 499 if (filled_slots > dev->hbuf_depth) 500 return -EOVERFLOW; 501 502 return empty_slots; 503 } 504 505 /** 506 * mei_me_hbuf_max_len - returns size of hw buffer. 507 * 508 * @dev: the device structure 509 * 510 * Return: size of hw buffer in bytes 511 */ 512 static size_t mei_me_hbuf_max_len(const struct mei_device *dev) 513 { 514 return dev->hbuf_depth * sizeof(u32) - sizeof(struct mei_msg_hdr); 515 } 516 517 518 /** 519 * mei_me_hbuf_write - writes a message to host hw buffer. 520 * 521 * @dev: the device structure 522 * @header: mei HECI header of message 523 * @buf: message payload will be written 524 * 525 * Return: -EIO if write has failed 526 */ 527 static int mei_me_hbuf_write(struct mei_device *dev, 528 struct mei_msg_hdr *header, 529 const unsigned char *buf) 530 { 531 unsigned long rem; 532 unsigned long length = header->length; 533 u32 *reg_buf = (u32 *)buf; 534 u32 dw_cnt; 535 int i; 536 int empty_slots; 537 538 dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(header)); 539 540 empty_slots = mei_hbuf_empty_slots(dev); 541 dev_dbg(dev->dev, "empty slots = %hu.\n", empty_slots); 542 543 dw_cnt = mei_data2slots(length); 544 if (empty_slots < 0 || dw_cnt > empty_slots) 545 return -EMSGSIZE; 546 547 mei_me_hcbww_write(dev, *((u32 *) header)); 548 549 for (i = 0; i < length / 4; i++) 550 mei_me_hcbww_write(dev, reg_buf[i]); 551 552 rem = length & 0x3; 553 if (rem > 0) { 554 u32 reg = 0; 555 556 memcpy(®, &buf[length - rem], rem); 557 mei_me_hcbww_write(dev, reg); 558 } 559 560 mei_hcsr_set_hig(dev); 561 if (!mei_me_hw_is_ready(dev)) 562 return -EIO; 563 564 return 0; 565 } 566 567 /** 568 * mei_me_count_full_read_slots - counts read full slots. 569 * 570 * @dev: the device structure 571 * 572 * Return: -EOVERFLOW if overflow, otherwise filled slots count 573 */ 574 static int mei_me_count_full_read_slots(struct mei_device *dev) 575 { 576 u32 me_csr; 577 char read_ptr, write_ptr; 578 unsigned char buffer_depth, filled_slots; 579 580 me_csr = mei_me_mecsr_read(dev); 581 buffer_depth = (unsigned char)((me_csr & ME_CBD_HRA) >> 24); 582 read_ptr = (char) ((me_csr & ME_CBRP_HRA) >> 8); 583 write_ptr = (char) ((me_csr & ME_CBWP_HRA) >> 16); 584 filled_slots = (unsigned char) (write_ptr - read_ptr); 585 586 /* check for overflow */ 587 if (filled_slots > buffer_depth) 588 return -EOVERFLOW; 589 590 dev_dbg(dev->dev, "filled_slots =%08x\n", filled_slots); 591 return (int)filled_slots; 592 } 593 594 /** 595 * mei_me_read_slots - reads a message from mei device. 596 * 597 * @dev: the device structure 598 * @buffer: message buffer will be written 599 * @buffer_length: message size will be read 600 * 601 * Return: always 0 602 */ 603 static int mei_me_read_slots(struct mei_device *dev, unsigned char *buffer, 604 unsigned long buffer_length) 605 { 606 u32 *reg_buf = (u32 *)buffer; 607 608 for (; buffer_length >= sizeof(u32); buffer_length -= sizeof(u32)) 609 *reg_buf++ = mei_me_mecbrw_read(dev); 610 611 if (buffer_length > 0) { 612 u32 reg = mei_me_mecbrw_read(dev); 613 614 memcpy(reg_buf, ®, buffer_length); 615 } 616 617 mei_hcsr_set_hig(dev); 618 return 0; 619 } 620 621 /** 622 * mei_me_pg_set - write pg enter register 623 * 624 * @dev: the device structure 625 */ 626 static void mei_me_pg_set(struct mei_device *dev) 627 { 628 struct mei_me_hw *hw = to_me_hw(dev); 629 u32 reg; 630 631 reg = mei_me_reg_read(hw, H_HPG_CSR); 632 trace_mei_reg_read(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg); 633 634 reg |= H_HPG_CSR_PGI; 635 636 trace_mei_reg_write(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg); 637 mei_me_reg_write(hw, H_HPG_CSR, reg); 638 } 639 640 /** 641 * mei_me_pg_unset - write pg exit register 642 * 643 * @dev: the device structure 644 */ 645 static void mei_me_pg_unset(struct mei_device *dev) 646 { 647 struct mei_me_hw *hw = to_me_hw(dev); 648 u32 reg; 649 650 reg = mei_me_reg_read(hw, H_HPG_CSR); 651 trace_mei_reg_read(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg); 652 653 WARN(!(reg & H_HPG_CSR_PGI), "PGI is not set\n"); 654 655 reg |= H_HPG_CSR_PGIHEXR; 656 657 trace_mei_reg_write(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg); 658 mei_me_reg_write(hw, H_HPG_CSR, reg); 659 } 660 661 /** 662 * mei_me_pg_legacy_enter_sync - perform legacy pg entry procedure 663 * 664 * @dev: the device structure 665 * 666 * Return: 0 on success an error code otherwise 667 */ 668 static int mei_me_pg_legacy_enter_sync(struct mei_device *dev) 669 { 670 struct mei_me_hw *hw = to_me_hw(dev); 671 unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT); 672 int ret; 673 674 dev->pg_event = MEI_PG_EVENT_WAIT; 675 676 ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_ENTRY_REQ_CMD); 677 if (ret) 678 return ret; 679 680 mutex_unlock(&dev->device_lock); 681 wait_event_timeout(dev->wait_pg, 682 dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout); 683 mutex_lock(&dev->device_lock); 684 685 if (dev->pg_event == MEI_PG_EVENT_RECEIVED) { 686 mei_me_pg_set(dev); 687 ret = 0; 688 } else { 689 ret = -ETIME; 690 } 691 692 dev->pg_event = MEI_PG_EVENT_IDLE; 693 hw->pg_state = MEI_PG_ON; 694 695 return ret; 696 } 697 698 /** 699 * mei_me_pg_legacy_exit_sync - perform legacy pg exit procedure 700 * 701 * @dev: the device structure 702 * 703 * Return: 0 on success an error code otherwise 704 */ 705 static int mei_me_pg_legacy_exit_sync(struct mei_device *dev) 706 { 707 struct mei_me_hw *hw = to_me_hw(dev); 708 unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT); 709 int ret; 710 711 if (dev->pg_event == MEI_PG_EVENT_RECEIVED) 712 goto reply; 713 714 dev->pg_event = MEI_PG_EVENT_WAIT; 715 716 mei_me_pg_unset(dev); 717 718 mutex_unlock(&dev->device_lock); 719 wait_event_timeout(dev->wait_pg, 720 dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout); 721 mutex_lock(&dev->device_lock); 722 723 reply: 724 if (dev->pg_event != MEI_PG_EVENT_RECEIVED) { 725 ret = -ETIME; 726 goto out; 727 } 728 729 dev->pg_event = MEI_PG_EVENT_INTR_WAIT; 730 ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_EXIT_RES_CMD); 731 if (ret) 732 return ret; 733 734 mutex_unlock(&dev->device_lock); 735 wait_event_timeout(dev->wait_pg, 736 dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED, timeout); 737 mutex_lock(&dev->device_lock); 738 739 if (dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED) 740 ret = 0; 741 else 742 ret = -ETIME; 743 744 out: 745 dev->pg_event = MEI_PG_EVENT_IDLE; 746 hw->pg_state = MEI_PG_OFF; 747 748 return ret; 749 } 750 751 /** 752 * mei_me_pg_in_transition - is device now in pg transition 753 * 754 * @dev: the device structure 755 * 756 * Return: true if in pg transition, false otherwise 757 */ 758 static bool mei_me_pg_in_transition(struct mei_device *dev) 759 { 760 return dev->pg_event >= MEI_PG_EVENT_WAIT && 761 dev->pg_event <= MEI_PG_EVENT_INTR_WAIT; 762 } 763 764 /** 765 * mei_me_pg_is_enabled - detect if PG is supported by HW 766 * 767 * @dev: the device structure 768 * 769 * Return: true is pg supported, false otherwise 770 */ 771 static bool mei_me_pg_is_enabled(struct mei_device *dev) 772 { 773 struct mei_me_hw *hw = to_me_hw(dev); 774 u32 reg = mei_me_mecsr_read(dev); 775 776 if (hw->d0i3_supported) 777 return true; 778 779 if ((reg & ME_PGIC_HRA) == 0) 780 goto notsupported; 781 782 if (!dev->hbm_f_pg_supported) 783 goto notsupported; 784 785 return true; 786 787 notsupported: 788 dev_dbg(dev->dev, "pg: not supported: d0i3 = %d HGP = %d hbm version %d.%d ?= %d.%d\n", 789 hw->d0i3_supported, 790 !!(reg & ME_PGIC_HRA), 791 dev->version.major_version, 792 dev->version.minor_version, 793 HBM_MAJOR_VERSION_PGI, 794 HBM_MINOR_VERSION_PGI); 795 796 return false; 797 } 798 799 /** 800 * mei_me_d0i3_set - write d0i3 register bit on mei device. 801 * 802 * @dev: the device structure 803 * @intr: ask for interrupt 804 * 805 * Return: D0I3C register value 806 */ 807 static u32 mei_me_d0i3_set(struct mei_device *dev, bool intr) 808 { 809 u32 reg = mei_me_d0i3c_read(dev); 810 811 reg |= H_D0I3C_I3; 812 if (intr) 813 reg |= H_D0I3C_IR; 814 else 815 reg &= ~H_D0I3C_IR; 816 mei_me_d0i3c_write(dev, reg); 817 /* read it to ensure HW consistency */ 818 reg = mei_me_d0i3c_read(dev); 819 return reg; 820 } 821 822 /** 823 * mei_me_d0i3_unset - clean d0i3 register bit on mei device. 824 * 825 * @dev: the device structure 826 * 827 * Return: D0I3C register value 828 */ 829 static u32 mei_me_d0i3_unset(struct mei_device *dev) 830 { 831 u32 reg = mei_me_d0i3c_read(dev); 832 833 reg &= ~H_D0I3C_I3; 834 reg |= H_D0I3C_IR; 835 mei_me_d0i3c_write(dev, reg); 836 /* read it to ensure HW consistency */ 837 reg = mei_me_d0i3c_read(dev); 838 return reg; 839 } 840 841 /** 842 * mei_me_d0i3_enter_sync - perform d0i3 entry procedure 843 * 844 * @dev: the device structure 845 * 846 * Return: 0 on success an error code otherwise 847 */ 848 static int mei_me_d0i3_enter_sync(struct mei_device *dev) 849 { 850 struct mei_me_hw *hw = to_me_hw(dev); 851 unsigned long d0i3_timeout = mei_secs_to_jiffies(MEI_D0I3_TIMEOUT); 852 unsigned long pgi_timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT); 853 int ret; 854 u32 reg; 855 856 reg = mei_me_d0i3c_read(dev); 857 if (reg & H_D0I3C_I3) { 858 /* we are in d0i3, nothing to do */ 859 dev_dbg(dev->dev, "d0i3 set not needed\n"); 860 ret = 0; 861 goto on; 862 } 863 864 /* PGI entry procedure */ 865 dev->pg_event = MEI_PG_EVENT_WAIT; 866 867 ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_ENTRY_REQ_CMD); 868 if (ret) 869 /* FIXME: should we reset here? */ 870 goto out; 871 872 mutex_unlock(&dev->device_lock); 873 wait_event_timeout(dev->wait_pg, 874 dev->pg_event == MEI_PG_EVENT_RECEIVED, pgi_timeout); 875 mutex_lock(&dev->device_lock); 876 877 if (dev->pg_event != MEI_PG_EVENT_RECEIVED) { 878 ret = -ETIME; 879 goto out; 880 } 881 /* end PGI entry procedure */ 882 883 dev->pg_event = MEI_PG_EVENT_INTR_WAIT; 884 885 reg = mei_me_d0i3_set(dev, true); 886 if (!(reg & H_D0I3C_CIP)) { 887 dev_dbg(dev->dev, "d0i3 enter wait not needed\n"); 888 ret = 0; 889 goto on; 890 } 891 892 mutex_unlock(&dev->device_lock); 893 wait_event_timeout(dev->wait_pg, 894 dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED, d0i3_timeout); 895 mutex_lock(&dev->device_lock); 896 897 if (dev->pg_event != MEI_PG_EVENT_INTR_RECEIVED) { 898 reg = mei_me_d0i3c_read(dev); 899 if (!(reg & H_D0I3C_I3)) { 900 ret = -ETIME; 901 goto out; 902 } 903 } 904 905 ret = 0; 906 on: 907 hw->pg_state = MEI_PG_ON; 908 out: 909 dev->pg_event = MEI_PG_EVENT_IDLE; 910 dev_dbg(dev->dev, "d0i3 enter ret = %d\n", ret); 911 return ret; 912 } 913 914 /** 915 * mei_me_d0i3_enter - perform d0i3 entry procedure 916 * no hbm PG handshake 917 * no waiting for confirmation; runs with interrupts 918 * disabled 919 * 920 * @dev: the device structure 921 * 922 * Return: 0 on success an error code otherwise 923 */ 924 static int mei_me_d0i3_enter(struct mei_device *dev) 925 { 926 struct mei_me_hw *hw = to_me_hw(dev); 927 u32 reg; 928 929 reg = mei_me_d0i3c_read(dev); 930 if (reg & H_D0I3C_I3) { 931 /* we are in d0i3, nothing to do */ 932 dev_dbg(dev->dev, "already d0i3 : set not needed\n"); 933 goto on; 934 } 935 936 mei_me_d0i3_set(dev, false); 937 on: 938 hw->pg_state = MEI_PG_ON; 939 dev->pg_event = MEI_PG_EVENT_IDLE; 940 dev_dbg(dev->dev, "d0i3 enter\n"); 941 return 0; 942 } 943 944 /** 945 * mei_me_d0i3_exit_sync - perform d0i3 exit procedure 946 * 947 * @dev: the device structure 948 * 949 * Return: 0 on success an error code otherwise 950 */ 951 static int mei_me_d0i3_exit_sync(struct mei_device *dev) 952 { 953 struct mei_me_hw *hw = to_me_hw(dev); 954 unsigned long timeout = mei_secs_to_jiffies(MEI_D0I3_TIMEOUT); 955 int ret; 956 u32 reg; 957 958 dev->pg_event = MEI_PG_EVENT_INTR_WAIT; 959 960 reg = mei_me_d0i3c_read(dev); 961 if (!(reg & H_D0I3C_I3)) { 962 /* we are not in d0i3, nothing to do */ 963 dev_dbg(dev->dev, "d0i3 exit not needed\n"); 964 ret = 0; 965 goto off; 966 } 967 968 reg = mei_me_d0i3_unset(dev); 969 if (!(reg & H_D0I3C_CIP)) { 970 dev_dbg(dev->dev, "d0i3 exit wait not needed\n"); 971 ret = 0; 972 goto off; 973 } 974 975 mutex_unlock(&dev->device_lock); 976 wait_event_timeout(dev->wait_pg, 977 dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED, timeout); 978 mutex_lock(&dev->device_lock); 979 980 if (dev->pg_event != MEI_PG_EVENT_INTR_RECEIVED) { 981 reg = mei_me_d0i3c_read(dev); 982 if (reg & H_D0I3C_I3) { 983 ret = -ETIME; 984 goto out; 985 } 986 } 987 988 ret = 0; 989 off: 990 hw->pg_state = MEI_PG_OFF; 991 out: 992 dev->pg_event = MEI_PG_EVENT_IDLE; 993 994 dev_dbg(dev->dev, "d0i3 exit ret = %d\n", ret); 995 return ret; 996 } 997 998 /** 999 * mei_me_pg_legacy_intr - perform legacy pg processing 1000 * in interrupt thread handler 1001 * 1002 * @dev: the device structure 1003 */ 1004 static void mei_me_pg_legacy_intr(struct mei_device *dev) 1005 { 1006 struct mei_me_hw *hw = to_me_hw(dev); 1007 1008 if (dev->pg_event != MEI_PG_EVENT_INTR_WAIT) 1009 return; 1010 1011 dev->pg_event = MEI_PG_EVENT_INTR_RECEIVED; 1012 hw->pg_state = MEI_PG_OFF; 1013 if (waitqueue_active(&dev->wait_pg)) 1014 wake_up(&dev->wait_pg); 1015 } 1016 1017 /** 1018 * mei_me_d0i3_intr - perform d0i3 processing in interrupt thread handler 1019 * 1020 * @dev: the device structure 1021 * @intr_source: interrupt source 1022 */ 1023 static void mei_me_d0i3_intr(struct mei_device *dev, u32 intr_source) 1024 { 1025 struct mei_me_hw *hw = to_me_hw(dev); 1026 1027 if (dev->pg_event == MEI_PG_EVENT_INTR_WAIT && 1028 (intr_source & H_D0I3C_IS)) { 1029 dev->pg_event = MEI_PG_EVENT_INTR_RECEIVED; 1030 if (hw->pg_state == MEI_PG_ON) { 1031 hw->pg_state = MEI_PG_OFF; 1032 if (dev->hbm_state != MEI_HBM_IDLE) { 1033 /* 1034 * force H_RDY because it could be 1035 * wiped off during PG 1036 */ 1037 dev_dbg(dev->dev, "d0i3 set host ready\n"); 1038 mei_me_host_set_ready(dev); 1039 } 1040 } else { 1041 hw->pg_state = MEI_PG_ON; 1042 } 1043 1044 wake_up(&dev->wait_pg); 1045 } 1046 1047 if (hw->pg_state == MEI_PG_ON && (intr_source & H_IS)) { 1048 /* 1049 * HW sent some data and we are in D0i3, so 1050 * we got here because of HW initiated exit from D0i3. 1051 * Start runtime pm resume sequence to exit low power state. 1052 */ 1053 dev_dbg(dev->dev, "d0i3 want resume\n"); 1054 mei_hbm_pg_resume(dev); 1055 } 1056 } 1057 1058 /** 1059 * mei_me_pg_intr - perform pg processing in interrupt thread handler 1060 * 1061 * @dev: the device structure 1062 * @intr_source: interrupt source 1063 */ 1064 static void mei_me_pg_intr(struct mei_device *dev, u32 intr_source) 1065 { 1066 struct mei_me_hw *hw = to_me_hw(dev); 1067 1068 if (hw->d0i3_supported) 1069 mei_me_d0i3_intr(dev, intr_source); 1070 else 1071 mei_me_pg_legacy_intr(dev); 1072 } 1073 1074 /** 1075 * mei_me_pg_enter_sync - perform runtime pm entry procedure 1076 * 1077 * @dev: the device structure 1078 * 1079 * Return: 0 on success an error code otherwise 1080 */ 1081 int mei_me_pg_enter_sync(struct mei_device *dev) 1082 { 1083 struct mei_me_hw *hw = to_me_hw(dev); 1084 1085 if (hw->d0i3_supported) 1086 return mei_me_d0i3_enter_sync(dev); 1087 else 1088 return mei_me_pg_legacy_enter_sync(dev); 1089 } 1090 1091 /** 1092 * mei_me_pg_exit_sync - perform runtime pm exit procedure 1093 * 1094 * @dev: the device structure 1095 * 1096 * Return: 0 on success an error code otherwise 1097 */ 1098 int mei_me_pg_exit_sync(struct mei_device *dev) 1099 { 1100 struct mei_me_hw *hw = to_me_hw(dev); 1101 1102 if (hw->d0i3_supported) 1103 return mei_me_d0i3_exit_sync(dev); 1104 else 1105 return mei_me_pg_legacy_exit_sync(dev); 1106 } 1107 1108 /** 1109 * mei_me_hw_reset - resets fw via mei csr register. 1110 * 1111 * @dev: the device structure 1112 * @intr_enable: if interrupt should be enabled after reset. 1113 * 1114 * Return: 0 on success an error code otherwise 1115 */ 1116 static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable) 1117 { 1118 struct mei_me_hw *hw = to_me_hw(dev); 1119 int ret; 1120 u32 hcsr; 1121 1122 if (intr_enable) { 1123 mei_me_intr_enable(dev); 1124 if (hw->d0i3_supported) { 1125 ret = mei_me_d0i3_exit_sync(dev); 1126 if (ret) 1127 return ret; 1128 } 1129 } 1130 1131 pm_runtime_set_active(dev->dev); 1132 1133 hcsr = mei_hcsr_read(dev); 1134 /* H_RST may be found lit before reset is started, 1135 * for example if preceding reset flow hasn't completed. 1136 * In that case asserting H_RST will be ignored, therefore 1137 * we need to clean H_RST bit to start a successful reset sequence. 1138 */ 1139 if ((hcsr & H_RST) == H_RST) { 1140 dev_warn(dev->dev, "H_RST is set = 0x%08X", hcsr); 1141 hcsr &= ~H_RST; 1142 mei_hcsr_set(dev, hcsr); 1143 hcsr = mei_hcsr_read(dev); 1144 } 1145 1146 hcsr |= H_RST | H_IG | H_CSR_IS_MASK; 1147 1148 if (!intr_enable) 1149 hcsr &= ~H_CSR_IE_MASK; 1150 1151 dev->recvd_hw_ready = false; 1152 mei_hcsr_write(dev, hcsr); 1153 1154 /* 1155 * Host reads the H_CSR once to ensure that the 1156 * posted write to H_CSR completes. 1157 */ 1158 hcsr = mei_hcsr_read(dev); 1159 1160 if ((hcsr & H_RST) == 0) 1161 dev_warn(dev->dev, "H_RST is not set = 0x%08X", hcsr); 1162 1163 if ((hcsr & H_RDY) == H_RDY) 1164 dev_warn(dev->dev, "H_RDY is not cleared 0x%08X", hcsr); 1165 1166 if (!intr_enable) { 1167 mei_me_hw_reset_release(dev); 1168 if (hw->d0i3_supported) { 1169 ret = mei_me_d0i3_enter(dev); 1170 if (ret) 1171 return ret; 1172 } 1173 } 1174 return 0; 1175 } 1176 1177 /** 1178 * mei_me_irq_quick_handler - The ISR of the MEI device 1179 * 1180 * @irq: The irq number 1181 * @dev_id: pointer to the device structure 1182 * 1183 * Return: irqreturn_t 1184 */ 1185 irqreturn_t mei_me_irq_quick_handler(int irq, void *dev_id) 1186 { 1187 struct mei_device *dev = (struct mei_device *)dev_id; 1188 u32 hcsr; 1189 1190 hcsr = mei_hcsr_read(dev); 1191 if (!me_intr_src(hcsr)) 1192 return IRQ_NONE; 1193 1194 dev_dbg(dev->dev, "interrupt source 0x%08X\n", me_intr_src(hcsr)); 1195 1196 /* disable interrupts on device */ 1197 me_intr_disable(dev, hcsr); 1198 return IRQ_WAKE_THREAD; 1199 } 1200 1201 /** 1202 * mei_me_irq_thread_handler - function called after ISR to handle the interrupt 1203 * processing. 1204 * 1205 * @irq: The irq number 1206 * @dev_id: pointer to the device structure 1207 * 1208 * Return: irqreturn_t 1209 * 1210 */ 1211 irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id) 1212 { 1213 struct mei_device *dev = (struct mei_device *) dev_id; 1214 struct list_head cmpl_list; 1215 s32 slots; 1216 u32 hcsr; 1217 int rets = 0; 1218 1219 dev_dbg(dev->dev, "function called after ISR to handle the interrupt processing.\n"); 1220 /* initialize our complete list */ 1221 mutex_lock(&dev->device_lock); 1222 1223 hcsr = mei_hcsr_read(dev); 1224 me_intr_clear(dev, hcsr); 1225 1226 INIT_LIST_HEAD(&cmpl_list); 1227 1228 /* check if ME wants a reset */ 1229 if (!mei_hw_is_ready(dev) && dev->dev_state != MEI_DEV_RESETTING) { 1230 dev_warn(dev->dev, "FW not ready: resetting.\n"); 1231 schedule_work(&dev->reset_work); 1232 goto end; 1233 } 1234 1235 if (mei_me_hw_is_resetting(dev)) 1236 mei_hcsr_set_hig(dev); 1237 1238 mei_me_pg_intr(dev, me_intr_src(hcsr)); 1239 1240 /* check if we need to start the dev */ 1241 if (!mei_host_is_ready(dev)) { 1242 if (mei_hw_is_ready(dev)) { 1243 dev_dbg(dev->dev, "we need to start the dev.\n"); 1244 dev->recvd_hw_ready = true; 1245 wake_up(&dev->wait_hw_ready); 1246 } else { 1247 dev_dbg(dev->dev, "Spurious Interrupt\n"); 1248 } 1249 goto end; 1250 } 1251 /* check slots available for reading */ 1252 slots = mei_count_full_read_slots(dev); 1253 while (slots > 0) { 1254 dev_dbg(dev->dev, "slots to read = %08x\n", slots); 1255 rets = mei_irq_read_handler(dev, &cmpl_list, &slots); 1256 /* There is a race between ME write and interrupt delivery: 1257 * Not all data is always available immediately after the 1258 * interrupt, so try to read again on the next interrupt. 1259 */ 1260 if (rets == -ENODATA) 1261 break; 1262 1263 if (rets && dev->dev_state != MEI_DEV_RESETTING) { 1264 dev_err(dev->dev, "mei_irq_read_handler ret = %d.\n", 1265 rets); 1266 schedule_work(&dev->reset_work); 1267 goto end; 1268 } 1269 } 1270 1271 dev->hbuf_is_ready = mei_hbuf_is_ready(dev); 1272 1273 /* 1274 * During PG handshake only allowed write is the replay to the 1275 * PG exit message, so block calling write function 1276 * if the pg event is in PG handshake 1277 */ 1278 if (dev->pg_event != MEI_PG_EVENT_WAIT && 1279 dev->pg_event != MEI_PG_EVENT_RECEIVED) { 1280 rets = mei_irq_write_handler(dev, &cmpl_list); 1281 dev->hbuf_is_ready = mei_hbuf_is_ready(dev); 1282 } 1283 1284 mei_irq_compl_handler(dev, &cmpl_list); 1285 1286 end: 1287 dev_dbg(dev->dev, "interrupt thread end ret = %d\n", rets); 1288 mei_me_intr_enable(dev); 1289 mutex_unlock(&dev->device_lock); 1290 return IRQ_HANDLED; 1291 } 1292 1293 static const struct mei_hw_ops mei_me_hw_ops = { 1294 1295 .fw_status = mei_me_fw_status, 1296 .pg_state = mei_me_pg_state, 1297 1298 .host_is_ready = mei_me_host_is_ready, 1299 1300 .hw_is_ready = mei_me_hw_is_ready, 1301 .hw_reset = mei_me_hw_reset, 1302 .hw_config = mei_me_hw_config, 1303 .hw_start = mei_me_hw_start, 1304 1305 .pg_in_transition = mei_me_pg_in_transition, 1306 .pg_is_enabled = mei_me_pg_is_enabled, 1307 1308 .intr_clear = mei_me_intr_clear, 1309 .intr_enable = mei_me_intr_enable, 1310 .intr_disable = mei_me_intr_disable, 1311 .synchronize_irq = mei_me_synchronize_irq, 1312 1313 .hbuf_free_slots = mei_me_hbuf_empty_slots, 1314 .hbuf_is_ready = mei_me_hbuf_is_empty, 1315 .hbuf_max_len = mei_me_hbuf_max_len, 1316 1317 .write = mei_me_hbuf_write, 1318 1319 .rdbuf_full_slots = mei_me_count_full_read_slots, 1320 .read_hdr = mei_me_mecbrw_read, 1321 .read = mei_me_read_slots 1322 }; 1323 1324 static bool mei_me_fw_type_nm(struct pci_dev *pdev) 1325 { 1326 u32 reg; 1327 1328 pci_read_config_dword(pdev, PCI_CFG_HFS_2, ®); 1329 trace_mei_pci_cfg_read(&pdev->dev, "PCI_CFG_HFS_2", PCI_CFG_HFS_2, reg); 1330 /* make sure that bit 9 (NM) is up and bit 10 (DM) is down */ 1331 return (reg & 0x600) == 0x200; 1332 } 1333 1334 #define MEI_CFG_FW_NM \ 1335 .quirk_probe = mei_me_fw_type_nm 1336 1337 static bool mei_me_fw_type_sps(struct pci_dev *pdev) 1338 { 1339 u32 reg; 1340 unsigned int devfn; 1341 1342 /* 1343 * Read ME FW Status register to check for SPS Firmware 1344 * The SPS FW is only signaled in pci function 0 1345 */ 1346 devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0); 1347 pci_bus_read_config_dword(pdev->bus, devfn, PCI_CFG_HFS_1, ®); 1348 trace_mei_pci_cfg_read(&pdev->dev, "PCI_CFG_HFS_1", PCI_CFG_HFS_1, reg); 1349 /* if bits [19:16] = 15, running SPS Firmware */ 1350 return (reg & 0xf0000) == 0xf0000; 1351 } 1352 1353 #define MEI_CFG_FW_SPS \ 1354 .quirk_probe = mei_me_fw_type_sps 1355 1356 1357 #define MEI_CFG_ICH_HFS \ 1358 .fw_status.count = 0 1359 1360 #define MEI_CFG_ICH10_HFS \ 1361 .fw_status.count = 1, \ 1362 .fw_status.status[0] = PCI_CFG_HFS_1 1363 1364 #define MEI_CFG_PCH_HFS \ 1365 .fw_status.count = 2, \ 1366 .fw_status.status[0] = PCI_CFG_HFS_1, \ 1367 .fw_status.status[1] = PCI_CFG_HFS_2 1368 1369 #define MEI_CFG_PCH8_HFS \ 1370 .fw_status.count = 6, \ 1371 .fw_status.status[0] = PCI_CFG_HFS_1, \ 1372 .fw_status.status[1] = PCI_CFG_HFS_2, \ 1373 .fw_status.status[2] = PCI_CFG_HFS_3, \ 1374 .fw_status.status[3] = PCI_CFG_HFS_4, \ 1375 .fw_status.status[4] = PCI_CFG_HFS_5, \ 1376 .fw_status.status[5] = PCI_CFG_HFS_6 1377 1378 /* ICH Legacy devices */ 1379 static const struct mei_cfg mei_me_ich_cfg = { 1380 MEI_CFG_ICH_HFS, 1381 }; 1382 1383 /* ICH devices */ 1384 static const struct mei_cfg mei_me_ich10_cfg = { 1385 MEI_CFG_ICH10_HFS, 1386 }; 1387 1388 /* PCH devices */ 1389 static const struct mei_cfg mei_me_pch_cfg = { 1390 MEI_CFG_PCH_HFS, 1391 }; 1392 1393 /* PCH Cougar Point and Patsburg with quirk for Node Manager exclusion */ 1394 static const struct mei_cfg mei_me_pch_cpt_pbg_cfg = { 1395 MEI_CFG_PCH_HFS, 1396 MEI_CFG_FW_NM, 1397 }; 1398 1399 /* PCH8 Lynx Point and newer devices */ 1400 static const struct mei_cfg mei_me_pch8_cfg = { 1401 MEI_CFG_PCH8_HFS, 1402 }; 1403 1404 /* PCH8 Lynx Point with quirk for SPS Firmware exclusion */ 1405 static const struct mei_cfg mei_me_pch8_sps_cfg = { 1406 MEI_CFG_PCH8_HFS, 1407 MEI_CFG_FW_SPS, 1408 }; 1409 1410 /* 1411 * mei_cfg_list - A list of platform platform specific configurations. 1412 * Note: has to be synchronized with enum mei_cfg_idx. 1413 */ 1414 static const struct mei_cfg *const mei_cfg_list[] = { 1415 [MEI_ME_UNDEF_CFG] = NULL, 1416 [MEI_ME_ICH_CFG] = &mei_me_ich_cfg, 1417 [MEI_ME_ICH10_CFG] = &mei_me_ich10_cfg, 1418 [MEI_ME_PCH_CFG] = &mei_me_pch_cfg, 1419 [MEI_ME_PCH_CPT_PBG_CFG] = &mei_me_pch_cpt_pbg_cfg, 1420 [MEI_ME_PCH8_CFG] = &mei_me_pch8_cfg, 1421 [MEI_ME_PCH8_SPS_CFG] = &mei_me_pch8_sps_cfg, 1422 }; 1423 1424 const struct mei_cfg *mei_me_get_cfg(kernel_ulong_t idx) 1425 { 1426 BUILD_BUG_ON(ARRAY_SIZE(mei_cfg_list) != MEI_ME_NUM_CFG); 1427 1428 if (idx >= MEI_ME_NUM_CFG) 1429 return NULL; 1430 1431 return mei_cfg_list[idx]; 1432 }; 1433 1434 /** 1435 * mei_me_dev_init - allocates and initializes the mei device structure 1436 * 1437 * @pdev: The pci device structure 1438 * @cfg: per device generation config 1439 * 1440 * Return: The mei_device pointer on success, NULL on failure. 1441 */ 1442 struct mei_device *mei_me_dev_init(struct pci_dev *pdev, 1443 const struct mei_cfg *cfg) 1444 { 1445 struct mei_device *dev; 1446 struct mei_me_hw *hw; 1447 1448 dev = devm_kzalloc(&pdev->dev, sizeof(struct mei_device) + 1449 sizeof(struct mei_me_hw), GFP_KERNEL); 1450 if (!dev) 1451 return NULL; 1452 hw = to_me_hw(dev); 1453 1454 mei_device_init(dev, &pdev->dev, &mei_me_hw_ops); 1455 hw->cfg = cfg; 1456 return dev; 1457 } 1458 1459