1 /* 2 * Copyright(c) 2015 - 2019 Intel Corporation. 3 * 4 * This file is provided under a dual BSD/GPLv2 license. When using or 5 * redistributing this file, you may do so under either license. 6 * 7 * GPL LICENSE SUMMARY 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of version 2 of the GNU General Public License as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * BSD LICENSE 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 24 * - Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * - Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in 28 * the documentation and/or other materials provided with the 29 * distribution. 30 * - Neither the name of Intel Corporation nor the names of its 31 * contributors may be used to endorse or promote products derived 32 * from this software without specific prior written permission. 33 * 34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 45 * 46 */ 47 48 #include <linux/pci.h> 49 #include <linux/io.h> 50 #include <linux/delay.h> 51 #include <linux/vmalloc.h> 52 #include <linux/aer.h> 53 #include <linux/module.h> 54 55 #include "hfi.h" 56 #include "chip_registers.h" 57 #include "aspm.h" 58 59 /* 60 * This file contains PCIe utility routines. 61 */ 62 63 /* 64 * Do all the common PCIe setup and initialization. 65 */ 66 int hfi1_pcie_init(struct hfi1_devdata *dd) 67 { 68 int ret; 69 struct pci_dev *pdev = dd->pcidev; 70 71 ret = pci_enable_device(pdev); 72 if (ret) { 73 /* 74 * This can happen (in theory) iff: 75 * We did a chip reset, and then failed to reprogram the 76 * BAR, or the chip reset due to an internal error. We then 77 * unloaded the driver and reloaded it. 78 * 79 * Both reset cases set the BAR back to initial state. For 80 * the latter case, the AER sticky error bit at offset 0x718 81 * should be set, but the Linux kernel doesn't yet know 82 * about that, it appears. If the original BAR was retained 83 * in the kernel data structures, this may be OK. 84 */ 85 dd_dev_err(dd, "pci enable failed: error %d\n", -ret); 86 return ret; 87 } 88 89 ret = pci_request_regions(pdev, DRIVER_NAME); 90 if (ret) { 91 dd_dev_err(dd, "pci_request_regions fails: err %d\n", -ret); 92 goto bail; 93 } 94 95 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); 96 if (ret) { 97 /* 98 * If the 64 bit setup fails, try 32 bit. Some systems 99 * do not setup 64 bit maps on systems with 2GB or less 100 * memory installed. 101 */ 102 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); 103 if (ret) { 104 dd_dev_err(dd, "Unable to set DMA mask: %d\n", ret); 105 goto bail; 106 } 107 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); 108 } else { 109 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)); 110 } 111 if (ret) { 112 dd_dev_err(dd, "Unable to set DMA consistent mask: %d\n", ret); 113 goto bail; 114 } 115 116 pci_set_master(pdev); 117 (void)pci_enable_pcie_error_reporting(pdev); 118 return 0; 119 120 bail: 121 hfi1_pcie_cleanup(pdev); 122 return ret; 123 } 124 125 /* 126 * Clean what was done in hfi1_pcie_init() 127 */ 128 void hfi1_pcie_cleanup(struct pci_dev *pdev) 129 { 130 pci_disable_device(pdev); 131 /* 132 * Release regions should be called after the disable. OK to 133 * call if request regions has not been called or failed. 134 */ 135 pci_release_regions(pdev); 136 } 137 138 /* 139 * Do remaining PCIe setup, once dd is allocated, and save away 140 * fields required to re-initialize after a chip reset, or for 141 * various other purposes 142 */ 143 int hfi1_pcie_ddinit(struct hfi1_devdata *dd, struct pci_dev *pdev) 144 { 145 unsigned long len; 146 resource_size_t addr; 147 int ret = 0; 148 u32 rcv_array_count; 149 150 addr = pci_resource_start(pdev, 0); 151 len = pci_resource_len(pdev, 0); 152 153 /* 154 * The TXE PIO buffers are at the tail end of the chip space. 155 * Cut them off and map them separately. 156 */ 157 158 /* sanity check vs expectations */ 159 if (len != TXE_PIO_SEND + TXE_PIO_SIZE) { 160 dd_dev_err(dd, "chip PIO range does not match\n"); 161 return -EINVAL; 162 } 163 164 dd->kregbase1 = ioremap(addr, RCV_ARRAY); 165 if (!dd->kregbase1) { 166 dd_dev_err(dd, "UC mapping of kregbase1 failed\n"); 167 return -ENOMEM; 168 } 169 dd_dev_info(dd, "UC base1: %p for %x\n", dd->kregbase1, RCV_ARRAY); 170 171 /* verify that reads actually work, save revision for reset check */ 172 dd->revision = readq(dd->kregbase1 + CCE_REVISION); 173 if (dd->revision == ~(u64)0) { 174 dd_dev_err(dd, "Cannot read chip CSRs\n"); 175 goto nomem; 176 } 177 178 rcv_array_count = readq(dd->kregbase1 + RCV_ARRAY_CNT); 179 dd_dev_info(dd, "RcvArray count: %u\n", rcv_array_count); 180 dd->base2_start = RCV_ARRAY + rcv_array_count * 8; 181 182 dd->kregbase2 = ioremap( 183 addr + dd->base2_start, 184 TXE_PIO_SEND - dd->base2_start); 185 if (!dd->kregbase2) { 186 dd_dev_err(dd, "UC mapping of kregbase2 failed\n"); 187 goto nomem; 188 } 189 dd_dev_info(dd, "UC base2: %p for %x\n", dd->kregbase2, 190 TXE_PIO_SEND - dd->base2_start); 191 192 dd->piobase = ioremap_wc(addr + TXE_PIO_SEND, TXE_PIO_SIZE); 193 if (!dd->piobase) { 194 dd_dev_err(dd, "WC mapping of send buffers failed\n"); 195 goto nomem; 196 } 197 dd_dev_info(dd, "WC piobase: %p for %x\n", dd->piobase, TXE_PIO_SIZE); 198 199 dd->physaddr = addr; /* used for io_remap, etc. */ 200 201 /* 202 * Map the chip's RcvArray as write-combining to allow us 203 * to write an entire cacheline worth of entries in one shot. 204 */ 205 dd->rcvarray_wc = ioremap_wc(addr + RCV_ARRAY, 206 rcv_array_count * 8); 207 if (!dd->rcvarray_wc) { 208 dd_dev_err(dd, "WC mapping of receive array failed\n"); 209 goto nomem; 210 } 211 dd_dev_info(dd, "WC RcvArray: %p for %x\n", 212 dd->rcvarray_wc, rcv_array_count * 8); 213 214 dd->flags |= HFI1_PRESENT; /* chip.c CSR routines now work */ 215 return 0; 216 nomem: 217 ret = -ENOMEM; 218 hfi1_pcie_ddcleanup(dd); 219 return ret; 220 } 221 222 /* 223 * Do PCIe cleanup related to dd, after chip-specific cleanup, etc. Just prior 224 * to releasing the dd memory. 225 * Void because all of the core pcie cleanup functions are void. 226 */ 227 void hfi1_pcie_ddcleanup(struct hfi1_devdata *dd) 228 { 229 dd->flags &= ~HFI1_PRESENT; 230 if (dd->kregbase1) 231 iounmap(dd->kregbase1); 232 dd->kregbase1 = NULL; 233 if (dd->kregbase2) 234 iounmap(dd->kregbase2); 235 dd->kregbase2 = NULL; 236 if (dd->rcvarray_wc) 237 iounmap(dd->rcvarray_wc); 238 dd->rcvarray_wc = NULL; 239 if (dd->piobase) 240 iounmap(dd->piobase); 241 dd->piobase = NULL; 242 } 243 244 /* return the PCIe link speed from the given link status */ 245 static u32 extract_speed(u16 linkstat) 246 { 247 u32 speed; 248 249 switch (linkstat & PCI_EXP_LNKSTA_CLS) { 250 default: /* not defined, assume Gen1 */ 251 case PCI_EXP_LNKSTA_CLS_2_5GB: 252 speed = 2500; /* Gen 1, 2.5GHz */ 253 break; 254 case PCI_EXP_LNKSTA_CLS_5_0GB: 255 speed = 5000; /* Gen 2, 5GHz */ 256 break; 257 case PCI_EXP_LNKSTA_CLS_8_0GB: 258 speed = 8000; /* Gen 3, 8GHz */ 259 break; 260 } 261 return speed; 262 } 263 264 /* return the PCIe link speed from the given link status */ 265 static u32 extract_width(u16 linkstat) 266 { 267 return (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT; 268 } 269 270 /* read the link status and set dd->{lbus_width,lbus_speed,lbus_info} */ 271 static void update_lbus_info(struct hfi1_devdata *dd) 272 { 273 u16 linkstat; 274 int ret; 275 276 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_LNKSTA, &linkstat); 277 if (ret) { 278 dd_dev_err(dd, "Unable to read from PCI config\n"); 279 return; 280 } 281 282 dd->lbus_width = extract_width(linkstat); 283 dd->lbus_speed = extract_speed(linkstat); 284 snprintf(dd->lbus_info, sizeof(dd->lbus_info), 285 "PCIe,%uMHz,x%u", dd->lbus_speed, dd->lbus_width); 286 } 287 288 /* 289 * Read in the current PCIe link width and speed. Find if the link is 290 * Gen3 capable. 291 */ 292 int pcie_speeds(struct hfi1_devdata *dd) 293 { 294 u32 linkcap; 295 struct pci_dev *parent = dd->pcidev->bus->self; 296 int ret; 297 298 if (!pci_is_pcie(dd->pcidev)) { 299 dd_dev_err(dd, "Can't find PCI Express capability!\n"); 300 return -EINVAL; 301 } 302 303 /* find if our max speed is Gen3 and parent supports Gen3 speeds */ 304 dd->link_gen3_capable = 1; 305 306 ret = pcie_capability_read_dword(dd->pcidev, PCI_EXP_LNKCAP, &linkcap); 307 if (ret) { 308 dd_dev_err(dd, "Unable to read from PCI config\n"); 309 return ret; 310 } 311 312 if ((linkcap & PCI_EXP_LNKCAP_SLS) != PCI_EXP_LNKCAP_SLS_8_0GB) { 313 dd_dev_info(dd, 314 "This HFI is not Gen3 capable, max speed 0x%x, need 0x3\n", 315 linkcap & PCI_EXP_LNKCAP_SLS); 316 dd->link_gen3_capable = 0; 317 } 318 319 /* 320 * bus->max_bus_speed is set from the bridge's linkcap Max Link Speed 321 */ 322 if (parent && 323 (dd->pcidev->bus->max_bus_speed == PCIE_SPEED_2_5GT || 324 dd->pcidev->bus->max_bus_speed == PCIE_SPEED_5_0GT)) { 325 dd_dev_info(dd, "Parent PCIe bridge does not support Gen3\n"); 326 dd->link_gen3_capable = 0; 327 } 328 329 /* obtain the link width and current speed */ 330 update_lbus_info(dd); 331 332 dd_dev_info(dd, "%s\n", dd->lbus_info); 333 334 return 0; 335 } 336 337 /* restore command and BARs after a reset has wiped them out */ 338 int restore_pci_variables(struct hfi1_devdata *dd) 339 { 340 int ret = 0; 341 342 ret = pci_write_config_word(dd->pcidev, PCI_COMMAND, dd->pci_command); 343 if (ret) 344 goto error; 345 346 ret = pci_write_config_dword(dd->pcidev, PCI_BASE_ADDRESS_0, 347 dd->pcibar0); 348 if (ret) 349 goto error; 350 351 ret = pci_write_config_dword(dd->pcidev, PCI_BASE_ADDRESS_1, 352 dd->pcibar1); 353 if (ret) 354 goto error; 355 356 ret = pci_write_config_dword(dd->pcidev, PCI_ROM_ADDRESS, dd->pci_rom); 357 if (ret) 358 goto error; 359 360 ret = pcie_capability_write_word(dd->pcidev, PCI_EXP_DEVCTL, 361 dd->pcie_devctl); 362 if (ret) 363 goto error; 364 365 ret = pcie_capability_write_word(dd->pcidev, PCI_EXP_LNKCTL, 366 dd->pcie_lnkctl); 367 if (ret) 368 goto error; 369 370 ret = pcie_capability_write_word(dd->pcidev, PCI_EXP_DEVCTL2, 371 dd->pcie_devctl2); 372 if (ret) 373 goto error; 374 375 ret = pci_write_config_dword(dd->pcidev, PCI_CFG_MSIX0, dd->pci_msix0); 376 if (ret) 377 goto error; 378 379 if (pci_find_ext_capability(dd->pcidev, PCI_EXT_CAP_ID_TPH)) { 380 ret = pci_write_config_dword(dd->pcidev, PCIE_CFG_TPH2, 381 dd->pci_tph2); 382 if (ret) 383 goto error; 384 } 385 return 0; 386 387 error: 388 dd_dev_err(dd, "Unable to write to PCI config\n"); 389 return ret; 390 } 391 392 /* Save BARs and command to rewrite after device reset */ 393 int save_pci_variables(struct hfi1_devdata *dd) 394 { 395 int ret = 0; 396 397 ret = pci_read_config_dword(dd->pcidev, PCI_BASE_ADDRESS_0, 398 &dd->pcibar0); 399 if (ret) 400 goto error; 401 402 ret = pci_read_config_dword(dd->pcidev, PCI_BASE_ADDRESS_1, 403 &dd->pcibar1); 404 if (ret) 405 goto error; 406 407 ret = pci_read_config_dword(dd->pcidev, PCI_ROM_ADDRESS, &dd->pci_rom); 408 if (ret) 409 goto error; 410 411 ret = pci_read_config_word(dd->pcidev, PCI_COMMAND, &dd->pci_command); 412 if (ret) 413 goto error; 414 415 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL, 416 &dd->pcie_devctl); 417 if (ret) 418 goto error; 419 420 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_LNKCTL, 421 &dd->pcie_lnkctl); 422 if (ret) 423 goto error; 424 425 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL2, 426 &dd->pcie_devctl2); 427 if (ret) 428 goto error; 429 430 ret = pci_read_config_dword(dd->pcidev, PCI_CFG_MSIX0, &dd->pci_msix0); 431 if (ret) 432 goto error; 433 434 if (pci_find_ext_capability(dd->pcidev, PCI_EXT_CAP_ID_TPH)) { 435 ret = pci_read_config_dword(dd->pcidev, PCIE_CFG_TPH2, 436 &dd->pci_tph2); 437 if (ret) 438 goto error; 439 } 440 return 0; 441 442 error: 443 dd_dev_err(dd, "Unable to read from PCI config\n"); 444 return ret; 445 } 446 447 /* 448 * BIOS may not set PCIe bus-utilization parameters for best performance. 449 * Check and optionally adjust them to maximize our throughput. 450 */ 451 static int hfi1_pcie_caps; 452 module_param_named(pcie_caps, hfi1_pcie_caps, int, 0444); 453 MODULE_PARM_DESC(pcie_caps, "Max PCIe tuning: Payload (0..3), ReadReq (4..7)"); 454 455 /** 456 * tune_pcie_caps() - Code to adjust PCIe capabilities. 457 * @dd: Valid device data structure 458 * 459 */ 460 void tune_pcie_caps(struct hfi1_devdata *dd) 461 { 462 struct pci_dev *parent; 463 u16 rc_mpss, rc_mps, ep_mpss, ep_mps; 464 u16 rc_mrrs, ep_mrrs, max_mrrs, ectl; 465 int ret; 466 467 /* 468 * Turn on extended tags in DevCtl in case the BIOS has turned it off 469 * to improve WFR SDMA bandwidth 470 */ 471 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL, &ectl); 472 if ((!ret) && !(ectl & PCI_EXP_DEVCTL_EXT_TAG)) { 473 dd_dev_info(dd, "Enabling PCIe extended tags\n"); 474 ectl |= PCI_EXP_DEVCTL_EXT_TAG; 475 ret = pcie_capability_write_word(dd->pcidev, 476 PCI_EXP_DEVCTL, ectl); 477 if (ret) 478 dd_dev_info(dd, "Unable to write to PCI config\n"); 479 } 480 /* Find out supported and configured values for parent (root) */ 481 parent = dd->pcidev->bus->self; 482 /* 483 * The driver cannot perform the tuning if it does not have 484 * access to the upstream component. 485 */ 486 if (!parent) { 487 dd_dev_info(dd, "Parent not found\n"); 488 return; 489 } 490 if (!pci_is_root_bus(parent->bus)) { 491 dd_dev_info(dd, "Parent not root\n"); 492 return; 493 } 494 if (!pci_is_pcie(parent)) { 495 dd_dev_info(dd, "Parent is not PCI Express capable\n"); 496 return; 497 } 498 if (!pci_is_pcie(dd->pcidev)) { 499 dd_dev_info(dd, "PCI device is not PCI Express capable\n"); 500 return; 501 } 502 rc_mpss = parent->pcie_mpss; 503 rc_mps = ffs(pcie_get_mps(parent)) - 8; 504 /* Find out supported and configured values for endpoint (us) */ 505 ep_mpss = dd->pcidev->pcie_mpss; 506 ep_mps = ffs(pcie_get_mps(dd->pcidev)) - 8; 507 508 /* Find max payload supported by root, endpoint */ 509 if (rc_mpss > ep_mpss) 510 rc_mpss = ep_mpss; 511 512 /* If Supported greater than limit in module param, limit it */ 513 if (rc_mpss > (hfi1_pcie_caps & 7)) 514 rc_mpss = hfi1_pcie_caps & 7; 515 /* If less than (allowed, supported), bump root payload */ 516 if (rc_mpss > rc_mps) { 517 rc_mps = rc_mpss; 518 pcie_set_mps(parent, 128 << rc_mps); 519 } 520 /* If less than (allowed, supported), bump endpoint payload */ 521 if (rc_mpss > ep_mps) { 522 ep_mps = rc_mpss; 523 pcie_set_mps(dd->pcidev, 128 << ep_mps); 524 } 525 526 /* 527 * Now the Read Request size. 528 * No field for max supported, but PCIe spec limits it to 4096, 529 * which is code '5' (log2(4096) - 7) 530 */ 531 max_mrrs = 5; 532 if (max_mrrs > ((hfi1_pcie_caps >> 4) & 7)) 533 max_mrrs = (hfi1_pcie_caps >> 4) & 7; 534 535 max_mrrs = 128 << max_mrrs; 536 rc_mrrs = pcie_get_readrq(parent); 537 ep_mrrs = pcie_get_readrq(dd->pcidev); 538 539 if (max_mrrs > rc_mrrs) { 540 rc_mrrs = max_mrrs; 541 pcie_set_readrq(parent, rc_mrrs); 542 } 543 if (max_mrrs > ep_mrrs) { 544 ep_mrrs = max_mrrs; 545 pcie_set_readrq(dd->pcidev, ep_mrrs); 546 } 547 } 548 549 /* End of PCIe capability tuning */ 550 551 /* 552 * From here through hfi1_pci_err_handler definition is invoked via 553 * PCI error infrastructure, registered via pci 554 */ 555 static pci_ers_result_t 556 pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state) 557 { 558 struct hfi1_devdata *dd = pci_get_drvdata(pdev); 559 pci_ers_result_t ret = PCI_ERS_RESULT_RECOVERED; 560 561 switch (state) { 562 case pci_channel_io_normal: 563 dd_dev_info(dd, "State Normal, ignoring\n"); 564 break; 565 566 case pci_channel_io_frozen: 567 dd_dev_info(dd, "State Frozen, requesting reset\n"); 568 pci_disable_device(pdev); 569 ret = PCI_ERS_RESULT_NEED_RESET; 570 break; 571 572 case pci_channel_io_perm_failure: 573 if (dd) { 574 dd_dev_info(dd, "State Permanent Failure, disabling\n"); 575 /* no more register accesses! */ 576 dd->flags &= ~HFI1_PRESENT; 577 hfi1_disable_after_error(dd); 578 } 579 /* else early, or other problem */ 580 ret = PCI_ERS_RESULT_DISCONNECT; 581 break; 582 583 default: /* shouldn't happen */ 584 dd_dev_info(dd, "HFI1 PCI errors detected (state %d)\n", 585 state); 586 break; 587 } 588 return ret; 589 } 590 591 static pci_ers_result_t 592 pci_mmio_enabled(struct pci_dev *pdev) 593 { 594 u64 words = 0U; 595 struct hfi1_devdata *dd = pci_get_drvdata(pdev); 596 pci_ers_result_t ret = PCI_ERS_RESULT_RECOVERED; 597 598 if (dd && dd->pport) { 599 words = read_port_cntr(dd->pport, C_RX_WORDS, CNTR_INVALID_VL); 600 if (words == ~0ULL) 601 ret = PCI_ERS_RESULT_NEED_RESET; 602 dd_dev_info(dd, 603 "HFI1 mmio_enabled function called, read wordscntr %llx, returning %d\n", 604 words, ret); 605 } 606 return ret; 607 } 608 609 static pci_ers_result_t 610 pci_slot_reset(struct pci_dev *pdev) 611 { 612 struct hfi1_devdata *dd = pci_get_drvdata(pdev); 613 614 dd_dev_info(dd, "HFI1 slot_reset function called, ignored\n"); 615 return PCI_ERS_RESULT_CAN_RECOVER; 616 } 617 618 static void 619 pci_resume(struct pci_dev *pdev) 620 { 621 struct hfi1_devdata *dd = pci_get_drvdata(pdev); 622 623 dd_dev_info(dd, "HFI1 resume function called\n"); 624 /* 625 * Running jobs will fail, since it's asynchronous 626 * unlike sysfs-requested reset. Better than 627 * doing nothing. 628 */ 629 hfi1_init(dd, 1); /* same as re-init after reset */ 630 } 631 632 const struct pci_error_handlers hfi1_pci_err_handler = { 633 .error_detected = pci_error_detected, 634 .mmio_enabled = pci_mmio_enabled, 635 .slot_reset = pci_slot_reset, 636 .resume = pci_resume, 637 }; 638 639 /*============================================================================*/ 640 /* PCIe Gen3 support */ 641 642 /* 643 * This code is separated out because it is expected to be removed in the 644 * final shipping product. If not, then it will be revisited and items 645 * will be moved to more standard locations. 646 */ 647 648 /* ASIC_PCI_SD_HOST_STATUS.FW_DNLD_STS field values */ 649 #define DL_STATUS_HFI0 0x1 /* hfi0 firmware download complete */ 650 #define DL_STATUS_HFI1 0x2 /* hfi1 firmware download complete */ 651 #define DL_STATUS_BOTH 0x3 /* hfi0 and hfi1 firmware download complete */ 652 653 /* ASIC_PCI_SD_HOST_STATUS.FW_DNLD_ERR field values */ 654 #define DL_ERR_NONE 0x0 /* no error */ 655 #define DL_ERR_SWAP_PARITY 0x1 /* parity error in SerDes interrupt */ 656 /* or response data */ 657 #define DL_ERR_DISABLED 0x2 /* hfi disabled */ 658 #define DL_ERR_SECURITY 0x3 /* security check failed */ 659 #define DL_ERR_SBUS 0x4 /* SBus status error */ 660 #define DL_ERR_XFR_PARITY 0x5 /* parity error during ROM transfer*/ 661 662 /* gasket block secondary bus reset delay */ 663 #define SBR_DELAY_US 200000 /* 200ms */ 664 665 static uint pcie_target = 3; 666 module_param(pcie_target, uint, S_IRUGO); 667 MODULE_PARM_DESC(pcie_target, "PCIe target speed (0 skip, 1-3 Gen1-3)"); 668 669 static uint pcie_force; 670 module_param(pcie_force, uint, S_IRUGO); 671 MODULE_PARM_DESC(pcie_force, "Force driver to do a PCIe firmware download even if already at target speed"); 672 673 static uint pcie_retry = 5; 674 module_param(pcie_retry, uint, S_IRUGO); 675 MODULE_PARM_DESC(pcie_retry, "Driver will try this many times to reach requested speed"); 676 677 #define UNSET_PSET 255 678 #define DEFAULT_DISCRETE_PSET 2 /* discrete HFI */ 679 #define DEFAULT_MCP_PSET 6 /* MCP HFI */ 680 static uint pcie_pset = UNSET_PSET; 681 module_param(pcie_pset, uint, S_IRUGO); 682 MODULE_PARM_DESC(pcie_pset, "PCIe Eq Pset value to use, range is 0-10"); 683 684 static uint pcie_ctle = 3; /* discrete on, integrated on */ 685 module_param(pcie_ctle, uint, S_IRUGO); 686 MODULE_PARM_DESC(pcie_ctle, "PCIe static CTLE mode, bit 0 - discrete on/off, bit 1 - integrated on/off"); 687 688 /* equalization columns */ 689 #define PREC 0 690 #define ATTN 1 691 #define POST 2 692 693 /* discrete silicon preliminary equalization values */ 694 static const u8 discrete_preliminary_eq[11][3] = { 695 /* prec attn post */ 696 { 0x00, 0x00, 0x12 }, /* p0 */ 697 { 0x00, 0x00, 0x0c }, /* p1 */ 698 { 0x00, 0x00, 0x0f }, /* p2 */ 699 { 0x00, 0x00, 0x09 }, /* p3 */ 700 { 0x00, 0x00, 0x00 }, /* p4 */ 701 { 0x06, 0x00, 0x00 }, /* p5 */ 702 { 0x09, 0x00, 0x00 }, /* p6 */ 703 { 0x06, 0x00, 0x0f }, /* p7 */ 704 { 0x09, 0x00, 0x09 }, /* p8 */ 705 { 0x0c, 0x00, 0x00 }, /* p9 */ 706 { 0x00, 0x00, 0x18 }, /* p10 */ 707 }; 708 709 /* integrated silicon preliminary equalization values */ 710 static const u8 integrated_preliminary_eq[11][3] = { 711 /* prec attn post */ 712 { 0x00, 0x1e, 0x07 }, /* p0 */ 713 { 0x00, 0x1e, 0x05 }, /* p1 */ 714 { 0x00, 0x1e, 0x06 }, /* p2 */ 715 { 0x00, 0x1e, 0x04 }, /* p3 */ 716 { 0x00, 0x1e, 0x00 }, /* p4 */ 717 { 0x03, 0x1e, 0x00 }, /* p5 */ 718 { 0x04, 0x1e, 0x00 }, /* p6 */ 719 { 0x03, 0x1e, 0x06 }, /* p7 */ 720 { 0x03, 0x1e, 0x04 }, /* p8 */ 721 { 0x05, 0x1e, 0x00 }, /* p9 */ 722 { 0x00, 0x1e, 0x0a }, /* p10 */ 723 }; 724 725 static const u8 discrete_ctle_tunings[11][4] = { 726 /* DC LF HF BW */ 727 { 0x48, 0x0b, 0x04, 0x04 }, /* p0 */ 728 { 0x60, 0x05, 0x0f, 0x0a }, /* p1 */ 729 { 0x50, 0x09, 0x06, 0x06 }, /* p2 */ 730 { 0x68, 0x05, 0x0f, 0x0a }, /* p3 */ 731 { 0x80, 0x05, 0x0f, 0x0a }, /* p4 */ 732 { 0x70, 0x05, 0x0f, 0x0a }, /* p5 */ 733 { 0x68, 0x05, 0x0f, 0x0a }, /* p6 */ 734 { 0x38, 0x0f, 0x00, 0x00 }, /* p7 */ 735 { 0x48, 0x09, 0x06, 0x06 }, /* p8 */ 736 { 0x60, 0x05, 0x0f, 0x0a }, /* p9 */ 737 { 0x38, 0x0f, 0x00, 0x00 }, /* p10 */ 738 }; 739 740 static const u8 integrated_ctle_tunings[11][4] = { 741 /* DC LF HF BW */ 742 { 0x38, 0x0f, 0x00, 0x00 }, /* p0 */ 743 { 0x38, 0x0f, 0x00, 0x00 }, /* p1 */ 744 { 0x38, 0x0f, 0x00, 0x00 }, /* p2 */ 745 { 0x38, 0x0f, 0x00, 0x00 }, /* p3 */ 746 { 0x58, 0x0a, 0x05, 0x05 }, /* p4 */ 747 { 0x48, 0x0a, 0x05, 0x05 }, /* p5 */ 748 { 0x40, 0x0a, 0x05, 0x05 }, /* p6 */ 749 { 0x38, 0x0f, 0x00, 0x00 }, /* p7 */ 750 { 0x38, 0x0f, 0x00, 0x00 }, /* p8 */ 751 { 0x38, 0x09, 0x06, 0x06 }, /* p9 */ 752 { 0x38, 0x0e, 0x01, 0x01 }, /* p10 */ 753 }; 754 755 /* helper to format the value to write to hardware */ 756 #define eq_value(pre, curr, post) \ 757 ((((u32)(pre)) << \ 758 PCIE_CFG_REG_PL102_GEN3_EQ_PRE_CURSOR_PSET_SHIFT) \ 759 | (((u32)(curr)) << PCIE_CFG_REG_PL102_GEN3_EQ_CURSOR_PSET_SHIFT) \ 760 | (((u32)(post)) << \ 761 PCIE_CFG_REG_PL102_GEN3_EQ_POST_CURSOR_PSET_SHIFT)) 762 763 /* 764 * Load the given EQ preset table into the PCIe hardware. 765 */ 766 static int load_eq_table(struct hfi1_devdata *dd, const u8 eq[11][3], u8 fs, 767 u8 div) 768 { 769 struct pci_dev *pdev = dd->pcidev; 770 u32 hit_error = 0; 771 u32 violation; 772 u32 i; 773 u8 c_minus1, c0, c_plus1; 774 int ret; 775 776 for (i = 0; i < 11; i++) { 777 /* set index */ 778 pci_write_config_dword(pdev, PCIE_CFG_REG_PL103, i); 779 /* write the value */ 780 c_minus1 = eq[i][PREC] / div; 781 c0 = fs - (eq[i][PREC] / div) - (eq[i][POST] / div); 782 c_plus1 = eq[i][POST] / div; 783 pci_write_config_dword(pdev, PCIE_CFG_REG_PL102, 784 eq_value(c_minus1, c0, c_plus1)); 785 /* check if these coefficients violate EQ rules */ 786 ret = pci_read_config_dword(dd->pcidev, 787 PCIE_CFG_REG_PL105, &violation); 788 if (ret) { 789 dd_dev_err(dd, "Unable to read from PCI config\n"); 790 hit_error = 1; 791 break; 792 } 793 794 if (violation 795 & PCIE_CFG_REG_PL105_GEN3_EQ_VIOLATE_COEF_RULES_SMASK){ 796 if (hit_error == 0) { 797 dd_dev_err(dd, 798 "Gen3 EQ Table Coefficient rule violations\n"); 799 dd_dev_err(dd, " prec attn post\n"); 800 } 801 dd_dev_err(dd, " p%02d: %02x %02x %02x\n", 802 i, (u32)eq[i][0], (u32)eq[i][1], 803 (u32)eq[i][2]); 804 dd_dev_err(dd, " %02x %02x %02x\n", 805 (u32)c_minus1, (u32)c0, (u32)c_plus1); 806 hit_error = 1; 807 } 808 } 809 if (hit_error) 810 return -EINVAL; 811 return 0; 812 } 813 814 /* 815 * Steps to be done after the PCIe firmware is downloaded and 816 * before the SBR for the Pcie Gen3. 817 * The SBus resource is already being held. 818 */ 819 static void pcie_post_steps(struct hfi1_devdata *dd) 820 { 821 int i; 822 823 set_sbus_fast_mode(dd); 824 /* 825 * Write to the PCIe PCSes to set the G3_LOCKED_NEXT bits to 1. 826 * This avoids a spurious framing error that can otherwise be 827 * generated by the MAC layer. 828 * 829 * Use individual addresses since no broadcast is set up. 830 */ 831 for (i = 0; i < NUM_PCIE_SERDES; i++) { 832 sbus_request(dd, pcie_pcs_addrs[dd->hfi1_id][i], 833 0x03, WRITE_SBUS_RECEIVER, 0x00022132); 834 } 835 836 clear_sbus_fast_mode(dd); 837 } 838 839 /* 840 * Trigger a secondary bus reset (SBR) on ourselves using our parent. 841 * 842 * Based on pci_parent_bus_reset() which is not exported by the 843 * kernel core. 844 */ 845 static int trigger_sbr(struct hfi1_devdata *dd) 846 { 847 struct pci_dev *dev = dd->pcidev; 848 struct pci_dev *pdev; 849 850 /* need a parent */ 851 if (!dev->bus->self) { 852 dd_dev_err(dd, "%s: no parent device\n", __func__); 853 return -ENOTTY; 854 } 855 856 /* should not be anyone else on the bus */ 857 list_for_each_entry(pdev, &dev->bus->devices, bus_list) 858 if (pdev != dev) { 859 dd_dev_err(dd, 860 "%s: another device is on the same bus\n", 861 __func__); 862 return -ENOTTY; 863 } 864 865 /* 866 * This is an end around to do an SBR during probe time. A new API needs 867 * to be implemented to have cleaner interface but this fixes the 868 * current brokenness 869 */ 870 return pci_bridge_secondary_bus_reset(dev->bus->self); 871 } 872 873 /* 874 * Write the given gasket interrupt register. 875 */ 876 static void write_gasket_interrupt(struct hfi1_devdata *dd, int index, 877 u16 code, u16 data) 878 { 879 write_csr(dd, ASIC_PCIE_SD_INTRPT_LIST + (index * 8), 880 (((u64)code << ASIC_PCIE_SD_INTRPT_LIST_INTRPT_CODE_SHIFT) | 881 ((u64)data << ASIC_PCIE_SD_INTRPT_LIST_INTRPT_DATA_SHIFT))); 882 } 883 884 /* 885 * Tell the gasket logic how to react to the reset. 886 */ 887 static void arm_gasket_logic(struct hfi1_devdata *dd) 888 { 889 u64 reg; 890 891 reg = (((u64)1 << dd->hfi1_id) << 892 ASIC_PCIE_SD_HOST_CMD_INTRPT_CMD_SHIFT) | 893 ((u64)pcie_serdes_broadcast[dd->hfi1_id] << 894 ASIC_PCIE_SD_HOST_CMD_SBUS_RCVR_ADDR_SHIFT | 895 ASIC_PCIE_SD_HOST_CMD_SBR_MODE_SMASK | 896 ((u64)SBR_DELAY_US & ASIC_PCIE_SD_HOST_CMD_TIMER_MASK) << 897 ASIC_PCIE_SD_HOST_CMD_TIMER_SHIFT); 898 write_csr(dd, ASIC_PCIE_SD_HOST_CMD, reg); 899 /* read back to push the write */ 900 read_csr(dd, ASIC_PCIE_SD_HOST_CMD); 901 } 902 903 /* 904 * CCE_PCIE_CTRL long name helpers 905 * We redefine these shorter macros to use in the code while leaving 906 * chip_registers.h to be autogenerated from the hardware spec. 907 */ 908 #define LANE_BUNDLE_MASK CCE_PCIE_CTRL_PCIE_LANE_BUNDLE_MASK 909 #define LANE_BUNDLE_SHIFT CCE_PCIE_CTRL_PCIE_LANE_BUNDLE_SHIFT 910 #define LANE_DELAY_MASK CCE_PCIE_CTRL_PCIE_LANE_DELAY_MASK 911 #define LANE_DELAY_SHIFT CCE_PCIE_CTRL_PCIE_LANE_DELAY_SHIFT 912 #define MARGIN_OVERWRITE_ENABLE_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_OVERWRITE_ENABLE_SHIFT 913 #define MARGIN_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_SHIFT 914 #define MARGIN_G1_G2_OVERWRITE_MASK CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_OVERWRITE_ENABLE_MASK 915 #define MARGIN_G1_G2_OVERWRITE_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_OVERWRITE_ENABLE_SHIFT 916 #define MARGIN_GEN1_GEN2_MASK CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_MASK 917 #define MARGIN_GEN1_GEN2_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_SHIFT 918 919 /* 920 * Write xmt_margin for full-swing (WFR-B) or half-swing (WFR-C). 921 */ 922 static void write_xmt_margin(struct hfi1_devdata *dd, const char *fname) 923 { 924 u64 pcie_ctrl; 925 u64 xmt_margin; 926 u64 xmt_margin_oe; 927 u64 lane_delay; 928 u64 lane_bundle; 929 930 pcie_ctrl = read_csr(dd, CCE_PCIE_CTRL); 931 932 /* 933 * For Discrete, use full-swing. 934 * - PCIe TX defaults to full-swing. 935 * Leave this register as default. 936 * For Integrated, use half-swing 937 * - Copy xmt_margin and xmt_margin_oe 938 * from Gen1/Gen2 to Gen3. 939 */ 940 if (dd->pcidev->device == PCI_DEVICE_ID_INTEL1) { /* integrated */ 941 /* extract initial fields */ 942 xmt_margin = (pcie_ctrl >> MARGIN_GEN1_GEN2_SHIFT) 943 & MARGIN_GEN1_GEN2_MASK; 944 xmt_margin_oe = (pcie_ctrl >> MARGIN_G1_G2_OVERWRITE_SHIFT) 945 & MARGIN_G1_G2_OVERWRITE_MASK; 946 lane_delay = (pcie_ctrl >> LANE_DELAY_SHIFT) & LANE_DELAY_MASK; 947 lane_bundle = (pcie_ctrl >> LANE_BUNDLE_SHIFT) 948 & LANE_BUNDLE_MASK; 949 950 /* 951 * For A0, EFUSE values are not set. Override with the 952 * correct values. 953 */ 954 if (is_ax(dd)) { 955 /* 956 * xmt_margin and OverwiteEnabel should be the 957 * same for Gen1/Gen2 and Gen3 958 */ 959 xmt_margin = 0x5; 960 xmt_margin_oe = 0x1; 961 lane_delay = 0xF; /* Delay 240ns. */ 962 lane_bundle = 0x0; /* Set to 1 lane. */ 963 } 964 965 /* overwrite existing values */ 966 pcie_ctrl = (xmt_margin << MARGIN_GEN1_GEN2_SHIFT) 967 | (xmt_margin_oe << MARGIN_G1_G2_OVERWRITE_SHIFT) 968 | (xmt_margin << MARGIN_SHIFT) 969 | (xmt_margin_oe << MARGIN_OVERWRITE_ENABLE_SHIFT) 970 | (lane_delay << LANE_DELAY_SHIFT) 971 | (lane_bundle << LANE_BUNDLE_SHIFT); 972 973 write_csr(dd, CCE_PCIE_CTRL, pcie_ctrl); 974 } 975 976 dd_dev_dbg(dd, "%s: program XMT margin, CcePcieCtrl 0x%llx\n", 977 fname, pcie_ctrl); 978 } 979 980 /* 981 * Do all the steps needed to transition the PCIe link to Gen3 speed. 982 */ 983 int do_pcie_gen3_transition(struct hfi1_devdata *dd) 984 { 985 struct pci_dev *parent = dd->pcidev->bus->self; 986 u64 fw_ctrl; 987 u64 reg, therm; 988 u32 reg32, fs, lf; 989 u32 status, err; 990 int ret; 991 int do_retry, retry_count = 0; 992 int intnum = 0; 993 uint default_pset; 994 uint pset = pcie_pset; 995 u16 target_vector, target_speed; 996 u16 lnkctl2, vendor; 997 u8 div; 998 const u8 (*eq)[3]; 999 const u8 (*ctle_tunings)[4]; 1000 uint static_ctle_mode; 1001 int return_error = 0; 1002 u32 target_width; 1003 1004 /* PCIe Gen3 is for the ASIC only */ 1005 if (dd->icode != ICODE_RTL_SILICON) 1006 return 0; 1007 1008 if (pcie_target == 1) { /* target Gen1 */ 1009 target_vector = PCI_EXP_LNKCTL2_TLS_2_5GT; 1010 target_speed = 2500; 1011 } else if (pcie_target == 2) { /* target Gen2 */ 1012 target_vector = PCI_EXP_LNKCTL2_TLS_5_0GT; 1013 target_speed = 5000; 1014 } else if (pcie_target == 3) { /* target Gen3 */ 1015 target_vector = PCI_EXP_LNKCTL2_TLS_8_0GT; 1016 target_speed = 8000; 1017 } else { 1018 /* off or invalid target - skip */ 1019 dd_dev_info(dd, "%s: Skipping PCIe transition\n", __func__); 1020 return 0; 1021 } 1022 1023 /* if already at target speed, done (unless forced) */ 1024 if (dd->lbus_speed == target_speed) { 1025 dd_dev_info(dd, "%s: PCIe already at gen%d, %s\n", __func__, 1026 pcie_target, 1027 pcie_force ? "re-doing anyway" : "skipping"); 1028 if (!pcie_force) 1029 return 0; 1030 } 1031 1032 /* 1033 * The driver cannot do the transition if it has no access to the 1034 * upstream component 1035 */ 1036 if (!parent) { 1037 dd_dev_info(dd, "%s: No upstream, Can't do gen3 transition\n", 1038 __func__); 1039 return 0; 1040 } 1041 1042 /* Previous Gen1/Gen2 bus width */ 1043 target_width = dd->lbus_width; 1044 1045 /* 1046 * Do the Gen3 transition. Steps are those of the PCIe Gen3 1047 * recipe. 1048 */ 1049 1050 /* step 1: pcie link working in gen1/gen2 */ 1051 1052 /* step 2: if either side is not capable of Gen3, done */ 1053 if (pcie_target == 3 && !dd->link_gen3_capable) { 1054 dd_dev_err(dd, "The PCIe link is not Gen3 capable\n"); 1055 ret = -ENOSYS; 1056 goto done_no_mutex; 1057 } 1058 1059 /* hold the SBus resource across the firmware download and SBR */ 1060 ret = acquire_chip_resource(dd, CR_SBUS, SBUS_TIMEOUT); 1061 if (ret) { 1062 dd_dev_err(dd, "%s: unable to acquire SBus resource\n", 1063 __func__); 1064 return ret; 1065 } 1066 1067 /* make sure thermal polling is not causing interrupts */ 1068 therm = read_csr(dd, ASIC_CFG_THERM_POLL_EN); 1069 if (therm) { 1070 write_csr(dd, ASIC_CFG_THERM_POLL_EN, 0x0); 1071 msleep(100); 1072 dd_dev_info(dd, "%s: Disabled therm polling\n", 1073 __func__); 1074 } 1075 1076 retry: 1077 /* the SBus download will reset the spico for thermal */ 1078 1079 /* step 3: download SBus Master firmware */ 1080 /* step 4: download PCIe Gen3 SerDes firmware */ 1081 dd_dev_info(dd, "%s: downloading firmware\n", __func__); 1082 ret = load_pcie_firmware(dd); 1083 if (ret) { 1084 /* do not proceed if the firmware cannot be downloaded */ 1085 return_error = 1; 1086 goto done; 1087 } 1088 1089 /* step 5: set up device parameter settings */ 1090 dd_dev_info(dd, "%s: setting PCIe registers\n", __func__); 1091 1092 /* 1093 * PcieCfgSpcie1 - Link Control 3 1094 * Leave at reset value. No need to set PerfEq - link equalization 1095 * will be performed automatically after the SBR when the target 1096 * speed is 8GT/s. 1097 */ 1098 1099 /* clear all 16 per-lane error bits (PCIe: Lane Error Status) */ 1100 pci_write_config_dword(dd->pcidev, PCIE_CFG_SPCIE2, 0xffff); 1101 1102 /* step 5a: Set Synopsys Port Logic registers */ 1103 1104 /* 1105 * PcieCfgRegPl2 - Port Force Link 1106 * 1107 * Set the low power field to 0x10 to avoid unnecessary power 1108 * management messages. All other fields are zero. 1109 */ 1110 reg32 = 0x10ul << PCIE_CFG_REG_PL2_LOW_PWR_ENT_CNT_SHIFT; 1111 pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL2, reg32); 1112 1113 /* 1114 * PcieCfgRegPl100 - Gen3 Control 1115 * 1116 * turn off PcieCfgRegPl100.Gen3ZRxDcNonCompl 1117 * turn on PcieCfgRegPl100.EqEieosCnt 1118 * Everything else zero. 1119 */ 1120 reg32 = PCIE_CFG_REG_PL100_EQ_EIEOS_CNT_SMASK; 1121 pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL100, reg32); 1122 1123 /* 1124 * PcieCfgRegPl101 - Gen3 EQ FS and LF 1125 * PcieCfgRegPl102 - Gen3 EQ Presets to Coefficients Mapping 1126 * PcieCfgRegPl103 - Gen3 EQ Preset Index 1127 * PcieCfgRegPl105 - Gen3 EQ Status 1128 * 1129 * Give initial EQ settings. 1130 */ 1131 if (dd->pcidev->device == PCI_DEVICE_ID_INTEL0) { /* discrete */ 1132 /* 1000mV, FS=24, LF = 8 */ 1133 fs = 24; 1134 lf = 8; 1135 div = 3; 1136 eq = discrete_preliminary_eq; 1137 default_pset = DEFAULT_DISCRETE_PSET; 1138 ctle_tunings = discrete_ctle_tunings; 1139 /* bit 0 - discrete on/off */ 1140 static_ctle_mode = pcie_ctle & 0x1; 1141 } else { 1142 /* 400mV, FS=29, LF = 9 */ 1143 fs = 29; 1144 lf = 9; 1145 div = 1; 1146 eq = integrated_preliminary_eq; 1147 default_pset = DEFAULT_MCP_PSET; 1148 ctle_tunings = integrated_ctle_tunings; 1149 /* bit 1 - integrated on/off */ 1150 static_ctle_mode = (pcie_ctle >> 1) & 0x1; 1151 } 1152 pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL101, 1153 (fs << 1154 PCIE_CFG_REG_PL101_GEN3_EQ_LOCAL_FS_SHIFT) | 1155 (lf << 1156 PCIE_CFG_REG_PL101_GEN3_EQ_LOCAL_LF_SHIFT)); 1157 ret = load_eq_table(dd, eq, fs, div); 1158 if (ret) 1159 goto done; 1160 1161 /* 1162 * PcieCfgRegPl106 - Gen3 EQ Control 1163 * 1164 * Set Gen3EqPsetReqVec, leave other fields 0. 1165 */ 1166 if (pset == UNSET_PSET) 1167 pset = default_pset; 1168 if (pset > 10) { /* valid range is 0-10, inclusive */ 1169 dd_dev_err(dd, "%s: Invalid Eq Pset %u, setting to %d\n", 1170 __func__, pset, default_pset); 1171 pset = default_pset; 1172 } 1173 dd_dev_info(dd, "%s: using EQ Pset %u\n", __func__, pset); 1174 pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL106, 1175 ((1 << pset) << 1176 PCIE_CFG_REG_PL106_GEN3_EQ_PSET_REQ_VEC_SHIFT) | 1177 PCIE_CFG_REG_PL106_GEN3_EQ_EVAL2MS_DISABLE_SMASK | 1178 PCIE_CFG_REG_PL106_GEN3_EQ_PHASE23_EXIT_MODE_SMASK); 1179 1180 /* 1181 * step 5b: Do post firmware download steps via SBus 1182 */ 1183 dd_dev_info(dd, "%s: doing pcie post steps\n", __func__); 1184 pcie_post_steps(dd); 1185 1186 /* 1187 * step 5c: Program gasket interrupts 1188 */ 1189 /* set the Rx Bit Rate to REFCLK ratio */ 1190 write_gasket_interrupt(dd, intnum++, 0x0006, 0x0050); 1191 /* disable pCal for PCIe Gen3 RX equalization */ 1192 /* select adaptive or static CTLE */ 1193 write_gasket_interrupt(dd, intnum++, 0x0026, 1194 0x5b01 | (static_ctle_mode << 3)); 1195 /* 1196 * Enable iCal for PCIe Gen3 RX equalization, and set which 1197 * evaluation of RX_EQ_EVAL will launch the iCal procedure. 1198 */ 1199 write_gasket_interrupt(dd, intnum++, 0x0026, 0x5202); 1200 1201 if (static_ctle_mode) { 1202 /* apply static CTLE tunings */ 1203 u8 pcie_dc, pcie_lf, pcie_hf, pcie_bw; 1204 1205 pcie_dc = ctle_tunings[pset][0]; 1206 pcie_lf = ctle_tunings[pset][1]; 1207 pcie_hf = ctle_tunings[pset][2]; 1208 pcie_bw = ctle_tunings[pset][3]; 1209 write_gasket_interrupt(dd, intnum++, 0x0026, 0x0200 | pcie_dc); 1210 write_gasket_interrupt(dd, intnum++, 0x0026, 0x0100 | pcie_lf); 1211 write_gasket_interrupt(dd, intnum++, 0x0026, 0x0000 | pcie_hf); 1212 write_gasket_interrupt(dd, intnum++, 0x0026, 0x5500 | pcie_bw); 1213 } 1214 1215 /* terminate list */ 1216 write_gasket_interrupt(dd, intnum++, 0x0000, 0x0000); 1217 1218 /* 1219 * step 5d: program XMT margin 1220 */ 1221 write_xmt_margin(dd, __func__); 1222 1223 /* 1224 * step 5e: disable active state power management (ASPM). It 1225 * will be enabled if required later 1226 */ 1227 dd_dev_info(dd, "%s: clearing ASPM\n", __func__); 1228 aspm_hw_disable_l1(dd); 1229 1230 /* 1231 * step 5f: clear DirectSpeedChange 1232 * PcieCfgRegPl67.DirectSpeedChange must be zero to prevent the 1233 * change in the speed target from starting before we are ready. 1234 * This field defaults to 0 and we are not changing it, so nothing 1235 * needs to be done. 1236 */ 1237 1238 /* step 5g: Set target link speed */ 1239 /* 1240 * Set target link speed to be target on both device and parent. 1241 * On setting the parent: Some system BIOSs "helpfully" set the 1242 * parent target speed to Gen2 to match the ASIC's initial speed. 1243 * We can set the target Gen3 because we have already checked 1244 * that it is Gen3 capable earlier. 1245 */ 1246 dd_dev_info(dd, "%s: setting parent target link speed\n", __func__); 1247 ret = pcie_capability_read_word(parent, PCI_EXP_LNKCTL2, &lnkctl2); 1248 if (ret) { 1249 dd_dev_err(dd, "Unable to read from PCI config\n"); 1250 return_error = 1; 1251 goto done; 1252 } 1253 1254 dd_dev_info(dd, "%s: ..old link control2: 0x%x\n", __func__, 1255 (u32)lnkctl2); 1256 /* only write to parent if target is not as high as ours */ 1257 if ((lnkctl2 & PCI_EXP_LNKCTL2_TLS) < target_vector) { 1258 lnkctl2 &= ~PCI_EXP_LNKCTL2_TLS; 1259 lnkctl2 |= target_vector; 1260 dd_dev_info(dd, "%s: ..new link control2: 0x%x\n", __func__, 1261 (u32)lnkctl2); 1262 ret = pcie_capability_write_word(parent, 1263 PCI_EXP_LNKCTL2, lnkctl2); 1264 if (ret) { 1265 dd_dev_err(dd, "Unable to write to PCI config\n"); 1266 return_error = 1; 1267 goto done; 1268 } 1269 } else { 1270 dd_dev_info(dd, "%s: ..target speed is OK\n", __func__); 1271 } 1272 1273 dd_dev_info(dd, "%s: setting target link speed\n", __func__); 1274 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_LNKCTL2, &lnkctl2); 1275 if (ret) { 1276 dd_dev_err(dd, "Unable to read from PCI config\n"); 1277 return_error = 1; 1278 goto done; 1279 } 1280 1281 dd_dev_info(dd, "%s: ..old link control2: 0x%x\n", __func__, 1282 (u32)lnkctl2); 1283 lnkctl2 &= ~PCI_EXP_LNKCTL2_TLS; 1284 lnkctl2 |= target_vector; 1285 dd_dev_info(dd, "%s: ..new link control2: 0x%x\n", __func__, 1286 (u32)lnkctl2); 1287 ret = pcie_capability_write_word(dd->pcidev, PCI_EXP_LNKCTL2, lnkctl2); 1288 if (ret) { 1289 dd_dev_err(dd, "Unable to write to PCI config\n"); 1290 return_error = 1; 1291 goto done; 1292 } 1293 1294 /* step 5h: arm gasket logic */ 1295 /* hold DC in reset across the SBR */ 1296 write_csr(dd, CCE_DC_CTRL, CCE_DC_CTRL_DC_RESET_SMASK); 1297 (void)read_csr(dd, CCE_DC_CTRL); /* DC reset hold */ 1298 /* save firmware control across the SBR */ 1299 fw_ctrl = read_csr(dd, MISC_CFG_FW_CTRL); 1300 1301 dd_dev_info(dd, "%s: arming gasket logic\n", __func__); 1302 arm_gasket_logic(dd); 1303 1304 /* 1305 * step 6: quiesce PCIe link 1306 * The chip has already been reset, so there will be no traffic 1307 * from the chip. Linux has no easy way to enforce that it will 1308 * not try to access the device, so we just need to hope it doesn't 1309 * do it while we are doing the reset. 1310 */ 1311 1312 /* 1313 * step 7: initiate the secondary bus reset (SBR) 1314 * step 8: hardware brings the links back up 1315 * step 9: wait for link speed transition to be complete 1316 */ 1317 dd_dev_info(dd, "%s: calling trigger_sbr\n", __func__); 1318 ret = trigger_sbr(dd); 1319 if (ret) 1320 goto done; 1321 1322 /* step 10: decide what to do next */ 1323 1324 /* check if we can read PCI space */ 1325 ret = pci_read_config_word(dd->pcidev, PCI_VENDOR_ID, &vendor); 1326 if (ret) { 1327 dd_dev_info(dd, 1328 "%s: read of VendorID failed after SBR, err %d\n", 1329 __func__, ret); 1330 return_error = 1; 1331 goto done; 1332 } 1333 if (vendor == 0xffff) { 1334 dd_dev_info(dd, "%s: VendorID is all 1s after SBR\n", __func__); 1335 return_error = 1; 1336 ret = -EIO; 1337 goto done; 1338 } 1339 1340 /* restore PCI space registers we know were reset */ 1341 dd_dev_info(dd, "%s: calling restore_pci_variables\n", __func__); 1342 ret = restore_pci_variables(dd); 1343 if (ret) { 1344 dd_dev_err(dd, "%s: Could not restore PCI variables\n", 1345 __func__); 1346 return_error = 1; 1347 goto done; 1348 } 1349 1350 /* restore firmware control */ 1351 write_csr(dd, MISC_CFG_FW_CTRL, fw_ctrl); 1352 1353 /* 1354 * Check the gasket block status. 1355 * 1356 * This is the first CSR read after the SBR. If the read returns 1357 * all 1s (fails), the link did not make it back. 1358 * 1359 * Once we're sure we can read and write, clear the DC reset after 1360 * the SBR. Then check for any per-lane errors. Then look over 1361 * the status. 1362 */ 1363 reg = read_csr(dd, ASIC_PCIE_SD_HOST_STATUS); 1364 dd_dev_info(dd, "%s: gasket block status: 0x%llx\n", __func__, reg); 1365 if (reg == ~0ull) { /* PCIe read failed/timeout */ 1366 dd_dev_err(dd, "SBR failed - unable to read from device\n"); 1367 return_error = 1; 1368 ret = -ENOSYS; 1369 goto done; 1370 } 1371 1372 /* clear the DC reset */ 1373 write_csr(dd, CCE_DC_CTRL, 0); 1374 1375 /* Set the LED off */ 1376 setextled(dd, 0); 1377 1378 /* check for any per-lane errors */ 1379 ret = pci_read_config_dword(dd->pcidev, PCIE_CFG_SPCIE2, ®32); 1380 if (ret) { 1381 dd_dev_err(dd, "Unable to read from PCI config\n"); 1382 return_error = 1; 1383 goto done; 1384 } 1385 1386 dd_dev_info(dd, "%s: per-lane errors: 0x%x\n", __func__, reg32); 1387 1388 /* extract status, look for our HFI */ 1389 status = (reg >> ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_STS_SHIFT) 1390 & ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_STS_MASK; 1391 if ((status & (1 << dd->hfi1_id)) == 0) { 1392 dd_dev_err(dd, 1393 "%s: gasket status 0x%x, expecting 0x%x\n", 1394 __func__, status, 1 << dd->hfi1_id); 1395 ret = -EIO; 1396 goto done; 1397 } 1398 1399 /* extract error */ 1400 err = (reg >> ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_ERR_SHIFT) 1401 & ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_ERR_MASK; 1402 if (err) { 1403 dd_dev_err(dd, "%s: gasket error %d\n", __func__, err); 1404 ret = -EIO; 1405 goto done; 1406 } 1407 1408 /* update our link information cache */ 1409 update_lbus_info(dd); 1410 dd_dev_info(dd, "%s: new speed and width: %s\n", __func__, 1411 dd->lbus_info); 1412 1413 if (dd->lbus_speed != target_speed || 1414 dd->lbus_width < target_width) { /* not target */ 1415 /* maybe retry */ 1416 do_retry = retry_count < pcie_retry; 1417 dd_dev_err(dd, "PCIe link speed or width did not match target%s\n", 1418 do_retry ? ", retrying" : ""); 1419 retry_count++; 1420 if (do_retry) { 1421 msleep(100); /* allow time to settle */ 1422 goto retry; 1423 } 1424 ret = -EIO; 1425 } 1426 1427 done: 1428 if (therm) { 1429 write_csr(dd, ASIC_CFG_THERM_POLL_EN, 0x1); 1430 msleep(100); 1431 dd_dev_info(dd, "%s: Re-enable therm polling\n", 1432 __func__); 1433 } 1434 release_chip_resource(dd, CR_SBUS); 1435 done_no_mutex: 1436 /* return no error if it is OK to be at current speed */ 1437 if (ret && !return_error) { 1438 dd_dev_err(dd, "Proceeding at current speed PCIe speed\n"); 1439 ret = 0; 1440 } 1441 1442 dd_dev_info(dd, "%s: done\n", __func__); 1443 return ret; 1444 } 1445