1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright(c) 2021 Intel Corporation. All rights reserved. */ 3 #include <linux/platform_device.h> 4 #include <linux/module.h> 5 #include <linux/device.h> 6 #include <linux/kernel.h> 7 #include <linux/acpi.h> 8 #include <linux/pci.h> 9 #include <asm/div64.h> 10 #include "cxlpci.h" 11 #include "cxl.h" 12 13 #define CXL_RCRB_SIZE SZ_8K 14 15 struct cxl_cxims_data { 16 int nr_maps; 17 u64 xormaps[]; 18 }; 19 20 /* 21 * Find a targets entry (n) in the host bridge interleave list. 22 * CXL Specification 3.0 Table 9-22 23 */ 24 static int cxl_xor_calc_n(u64 hpa, struct cxl_cxims_data *cximsd, int iw, 25 int ig) 26 { 27 int i = 0, n = 0; 28 u8 eiw; 29 30 /* IW: 2,4,6,8,12,16 begin building 'n' using xormaps */ 31 if (iw != 3) { 32 for (i = 0; i < cximsd->nr_maps; i++) 33 n |= (hweight64(hpa & cximsd->xormaps[i]) & 1) << i; 34 } 35 /* IW: 3,6,12 add a modulo calculation to 'n' */ 36 if (!is_power_of_2(iw)) { 37 if (ways_to_eiw(iw, &eiw)) 38 return -1; 39 hpa &= GENMASK_ULL(51, eiw + ig); 40 n |= do_div(hpa, 3) << i; 41 } 42 return n; 43 } 44 45 static struct cxl_dport *cxl_hb_xor(struct cxl_root_decoder *cxlrd, int pos) 46 { 47 struct cxl_cxims_data *cximsd = cxlrd->platform_data; 48 struct cxl_switch_decoder *cxlsd = &cxlrd->cxlsd; 49 struct cxl_decoder *cxld = &cxlsd->cxld; 50 int ig = cxld->interleave_granularity; 51 int iw = cxld->interleave_ways; 52 int n = 0; 53 u64 hpa; 54 55 if (dev_WARN_ONCE(&cxld->dev, 56 cxld->interleave_ways != cxlsd->nr_targets, 57 "misconfigured root decoder\n")) 58 return NULL; 59 60 hpa = cxlrd->res->start + pos * ig; 61 62 /* Entry (n) is 0 for no interleave (iw == 1) */ 63 if (iw != 1) 64 n = cxl_xor_calc_n(hpa, cximsd, iw, ig); 65 66 if (n < 0) 67 return NULL; 68 69 return cxlrd->cxlsd.target[n]; 70 } 71 72 struct cxl_cxims_context { 73 struct device *dev; 74 struct cxl_root_decoder *cxlrd; 75 }; 76 77 static int cxl_parse_cxims(union acpi_subtable_headers *header, void *arg, 78 const unsigned long end) 79 { 80 struct acpi_cedt_cxims *cxims = (struct acpi_cedt_cxims *)header; 81 struct cxl_cxims_context *ctx = arg; 82 struct cxl_root_decoder *cxlrd = ctx->cxlrd; 83 struct cxl_decoder *cxld = &cxlrd->cxlsd.cxld; 84 struct device *dev = ctx->dev; 85 struct cxl_cxims_data *cximsd; 86 unsigned int hbig, nr_maps; 87 int rc; 88 89 rc = eig_to_granularity(cxims->hbig, &hbig); 90 if (rc) 91 return rc; 92 93 /* Does this CXIMS entry apply to the given CXL Window? */ 94 if (hbig != cxld->interleave_granularity) 95 return 0; 96 97 /* IW 1,3 do not use xormaps and skip this parsing entirely */ 98 if (is_power_of_2(cxld->interleave_ways)) 99 /* 2, 4, 8, 16 way */ 100 nr_maps = ilog2(cxld->interleave_ways); 101 else 102 /* 6, 12 way */ 103 nr_maps = ilog2(cxld->interleave_ways / 3); 104 105 if (cxims->nr_xormaps < nr_maps) { 106 dev_dbg(dev, "CXIMS nr_xormaps[%d] expected[%d]\n", 107 cxims->nr_xormaps, nr_maps); 108 return -ENXIO; 109 } 110 111 cximsd = devm_kzalloc(dev, struct_size(cximsd, xormaps, nr_maps), 112 GFP_KERNEL); 113 if (!cximsd) 114 return -ENOMEM; 115 memcpy(cximsd->xormaps, cxims->xormap_list, 116 nr_maps * sizeof(*cximsd->xormaps)); 117 cximsd->nr_maps = nr_maps; 118 cxlrd->platform_data = cximsd; 119 120 return 0; 121 } 122 123 static unsigned long cfmws_to_decoder_flags(int restrictions) 124 { 125 unsigned long flags = CXL_DECODER_F_ENABLE; 126 127 if (restrictions & ACPI_CEDT_CFMWS_RESTRICT_TYPE2) 128 flags |= CXL_DECODER_F_TYPE2; 129 if (restrictions & ACPI_CEDT_CFMWS_RESTRICT_TYPE3) 130 flags |= CXL_DECODER_F_TYPE3; 131 if (restrictions & ACPI_CEDT_CFMWS_RESTRICT_VOLATILE) 132 flags |= CXL_DECODER_F_RAM; 133 if (restrictions & ACPI_CEDT_CFMWS_RESTRICT_PMEM) 134 flags |= CXL_DECODER_F_PMEM; 135 if (restrictions & ACPI_CEDT_CFMWS_RESTRICT_FIXED) 136 flags |= CXL_DECODER_F_LOCK; 137 138 return flags; 139 } 140 141 static int cxl_acpi_cfmws_verify(struct device *dev, 142 struct acpi_cedt_cfmws *cfmws) 143 { 144 int rc, expected_len; 145 unsigned int ways; 146 147 if (cfmws->interleave_arithmetic != ACPI_CEDT_CFMWS_ARITHMETIC_MODULO && 148 cfmws->interleave_arithmetic != ACPI_CEDT_CFMWS_ARITHMETIC_XOR) { 149 dev_err(dev, "CFMWS Unknown Interleave Arithmetic: %d\n", 150 cfmws->interleave_arithmetic); 151 return -EINVAL; 152 } 153 154 if (!IS_ALIGNED(cfmws->base_hpa, SZ_256M)) { 155 dev_err(dev, "CFMWS Base HPA not 256MB aligned\n"); 156 return -EINVAL; 157 } 158 159 if (!IS_ALIGNED(cfmws->window_size, SZ_256M)) { 160 dev_err(dev, "CFMWS Window Size not 256MB aligned\n"); 161 return -EINVAL; 162 } 163 164 rc = eiw_to_ways(cfmws->interleave_ways, &ways); 165 if (rc) { 166 dev_err(dev, "CFMWS Interleave Ways (%d) invalid\n", 167 cfmws->interleave_ways); 168 return -EINVAL; 169 } 170 171 expected_len = struct_size(cfmws, interleave_targets, ways); 172 173 if (cfmws->header.length < expected_len) { 174 dev_err(dev, "CFMWS length %d less than expected %d\n", 175 cfmws->header.length, expected_len); 176 return -EINVAL; 177 } 178 179 if (cfmws->header.length > expected_len) 180 dev_dbg(dev, "CFMWS length %d greater than expected %d\n", 181 cfmws->header.length, expected_len); 182 183 return 0; 184 } 185 186 /* 187 * Note, @dev must be the first member, see 'struct cxl_chbs_context' 188 * and mock_acpi_table_parse_cedt() 189 */ 190 struct cxl_cfmws_context { 191 struct device *dev; 192 struct cxl_port *root_port; 193 struct resource *cxl_res; 194 int id; 195 }; 196 197 static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg, 198 const unsigned long end) 199 { 200 int target_map[CXL_DECODER_MAX_INTERLEAVE]; 201 struct cxl_cfmws_context *ctx = arg; 202 struct cxl_port *root_port = ctx->root_port; 203 struct resource *cxl_res = ctx->cxl_res; 204 struct cxl_cxims_context cxims_ctx; 205 struct cxl_root_decoder *cxlrd; 206 struct device *dev = ctx->dev; 207 struct acpi_cedt_cfmws *cfmws; 208 cxl_calc_hb_fn cxl_calc_hb; 209 struct cxl_decoder *cxld; 210 unsigned int ways, i, ig; 211 struct resource *res; 212 int rc; 213 214 cfmws = (struct acpi_cedt_cfmws *) header; 215 216 rc = cxl_acpi_cfmws_verify(dev, cfmws); 217 if (rc) { 218 dev_err(dev, "CFMWS range %#llx-%#llx not registered\n", 219 cfmws->base_hpa, 220 cfmws->base_hpa + cfmws->window_size - 1); 221 return 0; 222 } 223 224 rc = eiw_to_ways(cfmws->interleave_ways, &ways); 225 if (rc) 226 return rc; 227 rc = eig_to_granularity(cfmws->granularity, &ig); 228 if (rc) 229 return rc; 230 for (i = 0; i < ways; i++) 231 target_map[i] = cfmws->interleave_targets[i]; 232 233 res = kzalloc(sizeof(*res), GFP_KERNEL); 234 if (!res) 235 return -ENOMEM; 236 237 res->name = kasprintf(GFP_KERNEL, "CXL Window %d", ctx->id++); 238 if (!res->name) 239 goto err_name; 240 241 res->start = cfmws->base_hpa; 242 res->end = cfmws->base_hpa + cfmws->window_size - 1; 243 res->flags = IORESOURCE_MEM; 244 245 /* add to the local resource tracking to establish a sort order */ 246 rc = insert_resource(cxl_res, res); 247 if (rc) 248 goto err_insert; 249 250 if (cfmws->interleave_arithmetic == ACPI_CEDT_CFMWS_ARITHMETIC_MODULO) 251 cxl_calc_hb = cxl_hb_modulo; 252 else 253 cxl_calc_hb = cxl_hb_xor; 254 255 cxlrd = cxl_root_decoder_alloc(root_port, ways, cxl_calc_hb); 256 if (IS_ERR(cxlrd)) 257 return 0; 258 259 cxld = &cxlrd->cxlsd.cxld; 260 cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions); 261 cxld->target_type = CXL_DECODER_HOSTONLYMEM; 262 cxld->hpa_range = (struct range) { 263 .start = res->start, 264 .end = res->end, 265 }; 266 cxld->interleave_ways = ways; 267 /* 268 * Minimize the x1 granularity to advertise support for any 269 * valid region granularity 270 */ 271 if (ways == 1) 272 ig = CXL_DECODER_MIN_GRANULARITY; 273 cxld->interleave_granularity = ig; 274 275 if (cfmws->interleave_arithmetic == ACPI_CEDT_CFMWS_ARITHMETIC_XOR) { 276 if (ways != 1 && ways != 3) { 277 cxims_ctx = (struct cxl_cxims_context) { 278 .dev = dev, 279 .cxlrd = cxlrd, 280 }; 281 rc = acpi_table_parse_cedt(ACPI_CEDT_TYPE_CXIMS, 282 cxl_parse_cxims, &cxims_ctx); 283 if (rc < 0) 284 goto err_xormap; 285 if (!cxlrd->platform_data) { 286 dev_err(dev, "No CXIMS for HBIG %u\n", ig); 287 rc = -EINVAL; 288 goto err_xormap; 289 } 290 } 291 } 292 rc = cxl_decoder_add(cxld, target_map); 293 err_xormap: 294 if (rc) 295 put_device(&cxld->dev); 296 else 297 rc = cxl_decoder_autoremove(dev, cxld); 298 if (rc) { 299 dev_err(dev, "Failed to add decode range: %pr", res); 300 return rc; 301 } 302 dev_dbg(dev, "add: %s node: %d range [%#llx - %#llx]\n", 303 dev_name(&cxld->dev), 304 phys_to_target_node(cxld->hpa_range.start), 305 cxld->hpa_range.start, cxld->hpa_range.end); 306 307 return 0; 308 309 err_insert: 310 kfree(res->name); 311 err_name: 312 kfree(res); 313 return -ENOMEM; 314 } 315 316 __mock struct acpi_device *to_cxl_host_bridge(struct device *host, 317 struct device *dev) 318 { 319 struct acpi_device *adev = to_acpi_device(dev); 320 321 if (!acpi_pci_find_root(adev->handle)) 322 return NULL; 323 324 if (strcmp(acpi_device_hid(adev), "ACPI0016") == 0) 325 return adev; 326 return NULL; 327 } 328 329 /* Note, @dev is used by mock_acpi_table_parse_cedt() */ 330 struct cxl_chbs_context { 331 struct device *dev; 332 unsigned long long uid; 333 resource_size_t base; 334 u32 cxl_version; 335 }; 336 337 static int cxl_get_chbs_iter(union acpi_subtable_headers *header, void *arg, 338 const unsigned long end) 339 { 340 struct cxl_chbs_context *ctx = arg; 341 struct acpi_cedt_chbs *chbs; 342 343 if (ctx->base != CXL_RESOURCE_NONE) 344 return 0; 345 346 chbs = (struct acpi_cedt_chbs *) header; 347 348 if (ctx->uid != chbs->uid) 349 return 0; 350 351 ctx->cxl_version = chbs->cxl_version; 352 if (!chbs->base) 353 return 0; 354 355 if (chbs->cxl_version == ACPI_CEDT_CHBS_VERSION_CXL11 && 356 chbs->length != CXL_RCRB_SIZE) 357 return 0; 358 359 ctx->base = chbs->base; 360 361 return 0; 362 } 363 364 static int cxl_get_chbs(struct device *dev, struct acpi_device *hb, 365 struct cxl_chbs_context *ctx) 366 { 367 unsigned long long uid; 368 int rc; 369 370 rc = acpi_evaluate_integer(hb->handle, METHOD_NAME__UID, NULL, &uid); 371 if (rc != AE_OK) { 372 dev_err(dev, "unable to retrieve _UID\n"); 373 return -ENOENT; 374 } 375 376 dev_dbg(dev, "UID found: %lld\n", uid); 377 *ctx = (struct cxl_chbs_context) { 378 .dev = dev, 379 .uid = uid, 380 .base = CXL_RESOURCE_NONE, 381 .cxl_version = UINT_MAX, 382 }; 383 384 acpi_table_parse_cedt(ACPI_CEDT_TYPE_CHBS, cxl_get_chbs_iter, ctx); 385 386 return 0; 387 } 388 389 static int add_host_bridge_dport(struct device *match, void *arg) 390 { 391 acpi_status rc; 392 struct device *bridge; 393 struct cxl_dport *dport; 394 struct cxl_chbs_context ctx; 395 struct acpi_pci_root *pci_root; 396 struct cxl_port *root_port = arg; 397 struct device *host = root_port->dev.parent; 398 struct acpi_device *hb = to_cxl_host_bridge(host, match); 399 400 if (!hb) 401 return 0; 402 403 rc = cxl_get_chbs(match, hb, &ctx); 404 if (rc) 405 return rc; 406 407 if (ctx.cxl_version == UINT_MAX) { 408 dev_warn(match, "No CHBS found for Host Bridge (UID %lld)\n", 409 ctx.uid); 410 return 0; 411 } 412 413 if (ctx.base == CXL_RESOURCE_NONE) { 414 dev_warn(match, "CHBS invalid for Host Bridge (UID %lld)\n", 415 ctx.uid); 416 return 0; 417 } 418 419 pci_root = acpi_pci_find_root(hb->handle); 420 bridge = pci_root->bus->bridge; 421 422 /* 423 * In RCH mode, bind the component regs base to the dport. In 424 * VH mode it will be bound to the CXL host bridge's port 425 * object later in add_host_bridge_uport(). 426 */ 427 if (ctx.cxl_version == ACPI_CEDT_CHBS_VERSION_CXL11) { 428 dev_dbg(match, "RCRB found for UID %lld: %pa\n", ctx.uid, 429 &ctx.base); 430 dport = devm_cxl_add_rch_dport(root_port, bridge, ctx.uid, 431 ctx.base); 432 } else { 433 dport = devm_cxl_add_dport(root_port, bridge, ctx.uid, 434 CXL_RESOURCE_NONE); 435 } 436 437 if (IS_ERR(dport)) 438 return PTR_ERR(dport); 439 440 return 0; 441 } 442 443 /* 444 * A host bridge is a dport to a CFMWS decode and it is a uport to the 445 * dport (PCIe Root Ports) in the host bridge. 446 */ 447 static int add_host_bridge_uport(struct device *match, void *arg) 448 { 449 struct cxl_port *root_port = arg; 450 struct device *host = root_port->dev.parent; 451 struct acpi_device *hb = to_cxl_host_bridge(host, match); 452 struct acpi_pci_root *pci_root; 453 struct cxl_dport *dport; 454 struct cxl_port *port; 455 struct device *bridge; 456 struct cxl_chbs_context ctx; 457 resource_size_t component_reg_phys; 458 int rc; 459 460 if (!hb) 461 return 0; 462 463 pci_root = acpi_pci_find_root(hb->handle); 464 bridge = pci_root->bus->bridge; 465 dport = cxl_find_dport_by_dev(root_port, bridge); 466 if (!dport) { 467 dev_dbg(host, "host bridge expected and not found\n"); 468 return 0; 469 } 470 471 if (dport->rch) { 472 dev_info(bridge, "host supports CXL (restricted)\n"); 473 return 0; 474 } 475 476 rc = cxl_get_chbs(match, hb, &ctx); 477 if (rc) 478 return rc; 479 480 if (ctx.cxl_version == ACPI_CEDT_CHBS_VERSION_CXL11) { 481 dev_warn(bridge, 482 "CXL CHBS version mismatch, skip port registration\n"); 483 return 0; 484 } 485 486 component_reg_phys = ctx.base; 487 if (component_reg_phys != CXL_RESOURCE_NONE) 488 dev_dbg(match, "CHBCR found for UID %lld: %pa\n", 489 ctx.uid, &component_reg_phys); 490 491 rc = devm_cxl_register_pci_bus(host, bridge, pci_root->bus); 492 if (rc) 493 return rc; 494 495 port = devm_cxl_add_port(host, bridge, component_reg_phys, dport); 496 if (IS_ERR(port)) 497 return PTR_ERR(port); 498 499 dev_info(bridge, "host supports CXL\n"); 500 501 return 0; 502 } 503 504 static int add_root_nvdimm_bridge(struct device *match, void *data) 505 { 506 struct cxl_decoder *cxld; 507 struct cxl_port *root_port = data; 508 struct cxl_nvdimm_bridge *cxl_nvb; 509 struct device *host = root_port->dev.parent; 510 511 if (!is_root_decoder(match)) 512 return 0; 513 514 cxld = to_cxl_decoder(match); 515 if (!(cxld->flags & CXL_DECODER_F_PMEM)) 516 return 0; 517 518 cxl_nvb = devm_cxl_add_nvdimm_bridge(host, root_port); 519 if (IS_ERR(cxl_nvb)) { 520 dev_dbg(host, "failed to register pmem\n"); 521 return PTR_ERR(cxl_nvb); 522 } 523 dev_dbg(host, "%s: add: %s\n", dev_name(&root_port->dev), 524 dev_name(&cxl_nvb->dev)); 525 return 1; 526 } 527 528 static struct lock_class_key cxl_root_key; 529 530 static void cxl_acpi_lock_reset_class(void *dev) 531 { 532 device_lock_reset_class(dev); 533 } 534 535 static void del_cxl_resource(struct resource *res) 536 { 537 kfree(res->name); 538 kfree(res); 539 } 540 541 static void cxl_set_public_resource(struct resource *priv, struct resource *pub) 542 { 543 priv->desc = (unsigned long) pub; 544 } 545 546 static struct resource *cxl_get_public_resource(struct resource *priv) 547 { 548 return (struct resource *) priv->desc; 549 } 550 551 static void remove_cxl_resources(void *data) 552 { 553 struct resource *res, *next, *cxl = data; 554 555 for (res = cxl->child; res; res = next) { 556 struct resource *victim = cxl_get_public_resource(res); 557 558 next = res->sibling; 559 remove_resource(res); 560 561 if (victim) { 562 remove_resource(victim); 563 kfree(victim); 564 } 565 566 del_cxl_resource(res); 567 } 568 } 569 570 /** 571 * add_cxl_resources() - reflect CXL fixed memory windows in iomem_resource 572 * @cxl_res: A standalone resource tree where each CXL window is a sibling 573 * 574 * Walk each CXL window in @cxl_res and add it to iomem_resource potentially 575 * expanding its boundaries to ensure that any conflicting resources become 576 * children. If a window is expanded it may then conflict with a another window 577 * entry and require the window to be truncated or trimmed. Consider this 578 * situation: 579 * 580 * |-- "CXL Window 0" --||----- "CXL Window 1" -----| 581 * |--------------- "System RAM" -------------| 582 * 583 * ...where platform firmware has established as System RAM resource across 2 584 * windows, but has left some portion of window 1 for dynamic CXL region 585 * provisioning. In this case "Window 0" will span the entirety of the "System 586 * RAM" span, and "CXL Window 1" is truncated to the remaining tail past the end 587 * of that "System RAM" resource. 588 */ 589 static int add_cxl_resources(struct resource *cxl_res) 590 { 591 struct resource *res, *new, *next; 592 593 for (res = cxl_res->child; res; res = next) { 594 new = kzalloc(sizeof(*new), GFP_KERNEL); 595 if (!new) 596 return -ENOMEM; 597 new->name = res->name; 598 new->start = res->start; 599 new->end = res->end; 600 new->flags = IORESOURCE_MEM; 601 new->desc = IORES_DESC_CXL; 602 603 /* 604 * Record the public resource in the private cxl_res tree for 605 * later removal. 606 */ 607 cxl_set_public_resource(res, new); 608 609 insert_resource_expand_to_fit(&iomem_resource, new); 610 611 next = res->sibling; 612 while (next && resource_overlaps(new, next)) { 613 if (resource_contains(new, next)) { 614 struct resource *_next = next->sibling; 615 616 remove_resource(next); 617 del_cxl_resource(next); 618 next = _next; 619 } else 620 next->start = new->end + 1; 621 } 622 } 623 return 0; 624 } 625 626 static int pair_cxl_resource(struct device *dev, void *data) 627 { 628 struct resource *cxl_res = data; 629 struct resource *p; 630 631 if (!is_root_decoder(dev)) 632 return 0; 633 634 for (p = cxl_res->child; p; p = p->sibling) { 635 struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(dev); 636 struct cxl_decoder *cxld = &cxlrd->cxlsd.cxld; 637 struct resource res = { 638 .start = cxld->hpa_range.start, 639 .end = cxld->hpa_range.end, 640 .flags = IORESOURCE_MEM, 641 }; 642 643 if (resource_contains(p, &res)) { 644 cxlrd->res = cxl_get_public_resource(p); 645 break; 646 } 647 } 648 649 return 0; 650 } 651 652 static int cxl_acpi_probe(struct platform_device *pdev) 653 { 654 int rc; 655 struct resource *cxl_res; 656 struct cxl_port *root_port; 657 struct device *host = &pdev->dev; 658 struct acpi_device *adev = ACPI_COMPANION(host); 659 struct cxl_cfmws_context ctx; 660 661 device_lock_set_class(&pdev->dev, &cxl_root_key); 662 rc = devm_add_action_or_reset(&pdev->dev, cxl_acpi_lock_reset_class, 663 &pdev->dev); 664 if (rc) 665 return rc; 666 667 cxl_res = devm_kzalloc(host, sizeof(*cxl_res), GFP_KERNEL); 668 if (!cxl_res) 669 return -ENOMEM; 670 cxl_res->name = "CXL mem"; 671 cxl_res->start = 0; 672 cxl_res->end = -1; 673 cxl_res->flags = IORESOURCE_MEM; 674 675 root_port = devm_cxl_add_port(host, host, CXL_RESOURCE_NONE, NULL); 676 if (IS_ERR(root_port)) 677 return PTR_ERR(root_port); 678 679 rc = bus_for_each_dev(adev->dev.bus, NULL, root_port, 680 add_host_bridge_dport); 681 if (rc < 0) 682 return rc; 683 684 rc = devm_add_action_or_reset(host, remove_cxl_resources, cxl_res); 685 if (rc) 686 return rc; 687 688 ctx = (struct cxl_cfmws_context) { 689 .dev = host, 690 .root_port = root_port, 691 .cxl_res = cxl_res, 692 }; 693 rc = acpi_table_parse_cedt(ACPI_CEDT_TYPE_CFMWS, cxl_parse_cfmws, &ctx); 694 if (rc < 0) 695 return -ENXIO; 696 697 rc = add_cxl_resources(cxl_res); 698 if (rc) 699 return rc; 700 701 /* 702 * Populate the root decoders with their related iomem resource, 703 * if present 704 */ 705 device_for_each_child(&root_port->dev, cxl_res, pair_cxl_resource); 706 707 /* 708 * Root level scanned with host-bridge as dports, now scan host-bridges 709 * for their role as CXL uports to their CXL-capable PCIe Root Ports. 710 */ 711 rc = bus_for_each_dev(adev->dev.bus, NULL, root_port, 712 add_host_bridge_uport); 713 if (rc < 0) 714 return rc; 715 716 if (IS_ENABLED(CONFIG_CXL_PMEM)) 717 rc = device_for_each_child(&root_port->dev, root_port, 718 add_root_nvdimm_bridge); 719 if (rc < 0) 720 return rc; 721 722 /* In case PCI is scanned before ACPI re-trigger memdev attach */ 723 cxl_bus_rescan(); 724 return 0; 725 } 726 727 static const struct acpi_device_id cxl_acpi_ids[] = { 728 { "ACPI0017" }, 729 { }, 730 }; 731 MODULE_DEVICE_TABLE(acpi, cxl_acpi_ids); 732 733 static const struct platform_device_id cxl_test_ids[] = { 734 { "cxl_acpi" }, 735 { }, 736 }; 737 MODULE_DEVICE_TABLE(platform, cxl_test_ids); 738 739 static struct platform_driver cxl_acpi_driver = { 740 .probe = cxl_acpi_probe, 741 .driver = { 742 .name = KBUILD_MODNAME, 743 .acpi_match_table = cxl_acpi_ids, 744 }, 745 .id_table = cxl_test_ids, 746 }; 747 748 static int __init cxl_acpi_init(void) 749 { 750 return platform_driver_register(&cxl_acpi_driver); 751 } 752 753 static void __exit cxl_acpi_exit(void) 754 { 755 platform_driver_unregister(&cxl_acpi_driver); 756 cxl_bus_drain(); 757 } 758 759 /* load before dax_hmem sees 'Soft Reserved' CXL ranges */ 760 subsys_initcall(cxl_acpi_init); 761 module_exit(cxl_acpi_exit); 762 MODULE_LICENSE("GPL v2"); 763 MODULE_IMPORT_NS(CXL); 764 MODULE_IMPORT_NS(ACPI); 765