1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corp. 2012 4 * 5 * Author(s): 6 * Jan Glauber <jang@linux.vnet.ibm.com> 7 * 8 * The System z PCI code is a rewrite from a prototype by 9 * the following people (Kudoz!): 10 * Alexander Schmidt 11 * Christoph Raisch 12 * Hannes Hering 13 * Hoang-Nam Nguyen 14 * Jan-Bernd Themann 15 * Stefan Roscher 16 * Thomas Klein 17 */ 18 19 #define KMSG_COMPONENT "zpci" 20 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 21 22 #include <linux/kernel.h> 23 #include <linux/slab.h> 24 #include <linux/err.h> 25 #include <linux/export.h> 26 #include <linux/delay.h> 27 #include <linux/seq_file.h> 28 #include <linux/jump_label.h> 29 #include <linux/pci.h> 30 #include <linux/printk.h> 31 32 #include <asm/isc.h> 33 #include <asm/airq.h> 34 #include <asm/facility.h> 35 #include <asm/pci_insn.h> 36 #include <asm/pci_clp.h> 37 #include <asm/pci_dma.h> 38 39 #include "pci_bus.h" 40 #include "pci_iov.h" 41 42 /* list of all detected zpci devices */ 43 static LIST_HEAD(zpci_list); 44 static DEFINE_SPINLOCK(zpci_list_lock); 45 46 static DECLARE_BITMAP(zpci_domain, ZPCI_DOMAIN_BITMAP_SIZE); 47 static DEFINE_SPINLOCK(zpci_domain_lock); 48 49 #define ZPCI_IOMAP_ENTRIES \ 50 min(((unsigned long) ZPCI_NR_DEVICES * PCI_STD_NUM_BARS / 2), \ 51 ZPCI_IOMAP_MAX_ENTRIES) 52 53 unsigned int s390_pci_no_rid; 54 55 static DEFINE_SPINLOCK(zpci_iomap_lock); 56 static unsigned long *zpci_iomap_bitmap; 57 struct zpci_iomap_entry *zpci_iomap_start; 58 EXPORT_SYMBOL_GPL(zpci_iomap_start); 59 60 DEFINE_STATIC_KEY_FALSE(have_mio); 61 62 static struct kmem_cache *zdev_fmb_cache; 63 64 struct zpci_dev *get_zdev_by_fid(u32 fid) 65 { 66 struct zpci_dev *tmp, *zdev = NULL; 67 68 spin_lock(&zpci_list_lock); 69 list_for_each_entry(tmp, &zpci_list, entry) { 70 if (tmp->fid == fid) { 71 zdev = tmp; 72 break; 73 } 74 } 75 spin_unlock(&zpci_list_lock); 76 return zdev; 77 } 78 79 void zpci_remove_reserved_devices(void) 80 { 81 struct zpci_dev *tmp, *zdev; 82 enum zpci_state state; 83 LIST_HEAD(remove); 84 85 spin_lock(&zpci_list_lock); 86 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) { 87 if (zdev->state == ZPCI_FN_STATE_STANDBY && 88 !clp_get_state(zdev->fid, &state) && 89 state == ZPCI_FN_STATE_RESERVED) 90 list_move_tail(&zdev->entry, &remove); 91 } 92 spin_unlock(&zpci_list_lock); 93 94 list_for_each_entry_safe(zdev, tmp, &remove, entry) 95 zpci_zdev_put(zdev); 96 } 97 98 int pci_domain_nr(struct pci_bus *bus) 99 { 100 return ((struct zpci_bus *) bus->sysdata)->domain_nr; 101 } 102 EXPORT_SYMBOL_GPL(pci_domain_nr); 103 104 int pci_proc_domain(struct pci_bus *bus) 105 { 106 return pci_domain_nr(bus); 107 } 108 EXPORT_SYMBOL_GPL(pci_proc_domain); 109 110 /* Modify PCI: Register I/O address translation parameters */ 111 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas, 112 u64 base, u64 limit, u64 iota) 113 { 114 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT); 115 struct zpci_fib fib = {0}; 116 u8 status; 117 118 WARN_ON_ONCE(iota & 0x3fff); 119 fib.pba = base; 120 fib.pal = limit; 121 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG; 122 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0; 123 } 124 125 /* Modify PCI: Unregister I/O address translation parameters */ 126 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas) 127 { 128 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT); 129 struct zpci_fib fib = {0}; 130 u8 cc, status; 131 132 cc = zpci_mod_fc(req, &fib, &status); 133 if (cc == 3) /* Function already gone. */ 134 cc = 0; 135 return cc ? -EIO : 0; 136 } 137 138 /* Modify PCI: Set PCI function measurement parameters */ 139 int zpci_fmb_enable_device(struct zpci_dev *zdev) 140 { 141 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE); 142 struct zpci_fib fib = {0}; 143 u8 cc, status; 144 145 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length) 146 return -EINVAL; 147 148 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL); 149 if (!zdev->fmb) 150 return -ENOMEM; 151 WARN_ON((u64) zdev->fmb & 0xf); 152 153 /* reset software counters */ 154 atomic64_set(&zdev->allocated_pages, 0); 155 atomic64_set(&zdev->mapped_pages, 0); 156 atomic64_set(&zdev->unmapped_pages, 0); 157 158 fib.fmb_addr = virt_to_phys(zdev->fmb); 159 cc = zpci_mod_fc(req, &fib, &status); 160 if (cc) { 161 kmem_cache_free(zdev_fmb_cache, zdev->fmb); 162 zdev->fmb = NULL; 163 } 164 return cc ? -EIO : 0; 165 } 166 167 /* Modify PCI: Disable PCI function measurement */ 168 int zpci_fmb_disable_device(struct zpci_dev *zdev) 169 { 170 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE); 171 struct zpci_fib fib = {0}; 172 u8 cc, status; 173 174 if (!zdev->fmb) 175 return -EINVAL; 176 177 /* Function measurement is disabled if fmb address is zero */ 178 cc = zpci_mod_fc(req, &fib, &status); 179 if (cc == 3) /* Function already gone. */ 180 cc = 0; 181 182 if (!cc) { 183 kmem_cache_free(zdev_fmb_cache, zdev->fmb); 184 zdev->fmb = NULL; 185 } 186 return cc ? -EIO : 0; 187 } 188 189 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len) 190 { 191 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len); 192 u64 data; 193 int rc; 194 195 rc = __zpci_load(&data, req, offset); 196 if (!rc) { 197 data = le64_to_cpu((__force __le64) data); 198 data >>= (8 - len) * 8; 199 *val = (u32) data; 200 } else 201 *val = 0xffffffff; 202 return rc; 203 } 204 205 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len) 206 { 207 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len); 208 u64 data = val; 209 int rc; 210 211 data <<= (8 - len) * 8; 212 data = (__force u64) cpu_to_le64(data); 213 rc = __zpci_store(data, req, offset); 214 return rc; 215 } 216 217 resource_size_t pcibios_align_resource(void *data, const struct resource *res, 218 resource_size_t size, 219 resource_size_t align) 220 { 221 return 0; 222 } 223 224 /* combine single writes by using store-block insn */ 225 void __iowrite64_copy(void __iomem *to, const void *from, size_t count) 226 { 227 zpci_memcpy_toio(to, from, count); 228 } 229 230 static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot) 231 { 232 unsigned long offset, vaddr; 233 struct vm_struct *area; 234 phys_addr_t last_addr; 235 236 last_addr = addr + size - 1; 237 if (!size || last_addr < addr) 238 return NULL; 239 240 if (!static_branch_unlikely(&have_mio)) 241 return (void __iomem *) addr; 242 243 offset = addr & ~PAGE_MASK; 244 addr &= PAGE_MASK; 245 size = PAGE_ALIGN(size + offset); 246 area = get_vm_area(size, VM_IOREMAP); 247 if (!area) 248 return NULL; 249 250 vaddr = (unsigned long) area->addr; 251 if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) { 252 free_vm_area(area); 253 return NULL; 254 } 255 return (void __iomem *) ((unsigned long) area->addr + offset); 256 } 257 258 void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot) 259 { 260 return __ioremap(addr, size, __pgprot(prot)); 261 } 262 EXPORT_SYMBOL(ioremap_prot); 263 264 void __iomem *ioremap(phys_addr_t addr, size_t size) 265 { 266 return __ioremap(addr, size, PAGE_KERNEL); 267 } 268 EXPORT_SYMBOL(ioremap); 269 270 void __iomem *ioremap_wc(phys_addr_t addr, size_t size) 271 { 272 return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL)); 273 } 274 EXPORT_SYMBOL(ioremap_wc); 275 276 void __iomem *ioremap_wt(phys_addr_t addr, size_t size) 277 { 278 return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL)); 279 } 280 EXPORT_SYMBOL(ioremap_wt); 281 282 void iounmap(volatile void __iomem *addr) 283 { 284 if (static_branch_likely(&have_mio)) 285 vunmap((__force void *) ((unsigned long) addr & PAGE_MASK)); 286 } 287 EXPORT_SYMBOL(iounmap); 288 289 /* Create a virtual mapping cookie for a PCI BAR */ 290 static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar, 291 unsigned long offset, unsigned long max) 292 { 293 struct zpci_dev *zdev = to_zpci(pdev); 294 int idx; 295 296 idx = zdev->bars[bar].map_idx; 297 spin_lock(&zpci_iomap_lock); 298 /* Detect overrun */ 299 WARN_ON(!++zpci_iomap_start[idx].count); 300 zpci_iomap_start[idx].fh = zdev->fh; 301 zpci_iomap_start[idx].bar = bar; 302 spin_unlock(&zpci_iomap_lock); 303 304 return (void __iomem *) ZPCI_ADDR(idx) + offset; 305 } 306 307 static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar, 308 unsigned long offset, 309 unsigned long max) 310 { 311 unsigned long barsize = pci_resource_len(pdev, bar); 312 struct zpci_dev *zdev = to_zpci(pdev); 313 void __iomem *iova; 314 315 iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize); 316 return iova ? iova + offset : iova; 317 } 318 319 void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar, 320 unsigned long offset, unsigned long max) 321 { 322 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar)) 323 return NULL; 324 325 if (static_branch_likely(&have_mio)) 326 return pci_iomap_range_mio(pdev, bar, offset, max); 327 else 328 return pci_iomap_range_fh(pdev, bar, offset, max); 329 } 330 EXPORT_SYMBOL(pci_iomap_range); 331 332 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) 333 { 334 return pci_iomap_range(dev, bar, 0, maxlen); 335 } 336 EXPORT_SYMBOL(pci_iomap); 337 338 static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar, 339 unsigned long offset, unsigned long max) 340 { 341 unsigned long barsize = pci_resource_len(pdev, bar); 342 struct zpci_dev *zdev = to_zpci(pdev); 343 void __iomem *iova; 344 345 iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize); 346 return iova ? iova + offset : iova; 347 } 348 349 void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar, 350 unsigned long offset, unsigned long max) 351 { 352 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar)) 353 return NULL; 354 355 if (static_branch_likely(&have_mio)) 356 return pci_iomap_wc_range_mio(pdev, bar, offset, max); 357 else 358 return pci_iomap_range_fh(pdev, bar, offset, max); 359 } 360 EXPORT_SYMBOL(pci_iomap_wc_range); 361 362 void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen) 363 { 364 return pci_iomap_wc_range(dev, bar, 0, maxlen); 365 } 366 EXPORT_SYMBOL(pci_iomap_wc); 367 368 static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr) 369 { 370 unsigned int idx = ZPCI_IDX(addr); 371 372 spin_lock(&zpci_iomap_lock); 373 /* Detect underrun */ 374 WARN_ON(!zpci_iomap_start[idx].count); 375 if (!--zpci_iomap_start[idx].count) { 376 zpci_iomap_start[idx].fh = 0; 377 zpci_iomap_start[idx].bar = 0; 378 } 379 spin_unlock(&zpci_iomap_lock); 380 } 381 382 static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr) 383 { 384 iounmap(addr); 385 } 386 387 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr) 388 { 389 if (static_branch_likely(&have_mio)) 390 pci_iounmap_mio(pdev, addr); 391 else 392 pci_iounmap_fh(pdev, addr); 393 } 394 EXPORT_SYMBOL(pci_iounmap); 395 396 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, 397 int size, u32 *val) 398 { 399 struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn); 400 401 return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV; 402 } 403 404 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, 405 int size, u32 val) 406 { 407 struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn); 408 409 return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV; 410 } 411 412 static struct pci_ops pci_root_ops = { 413 .read = pci_read, 414 .write = pci_write, 415 }; 416 417 static void zpci_map_resources(struct pci_dev *pdev) 418 { 419 struct zpci_dev *zdev = to_zpci(pdev); 420 resource_size_t len; 421 int i; 422 423 for (i = 0; i < PCI_STD_NUM_BARS; i++) { 424 len = pci_resource_len(pdev, i); 425 if (!len) 426 continue; 427 428 if (zpci_use_mio(zdev)) 429 pdev->resource[i].start = 430 (resource_size_t __force) zdev->bars[i].mio_wt; 431 else 432 pdev->resource[i].start = (resource_size_t __force) 433 pci_iomap_range_fh(pdev, i, 0, 0); 434 pdev->resource[i].end = pdev->resource[i].start + len - 1; 435 } 436 437 zpci_iov_map_resources(pdev); 438 } 439 440 static void zpci_unmap_resources(struct pci_dev *pdev) 441 { 442 struct zpci_dev *zdev = to_zpci(pdev); 443 resource_size_t len; 444 int i; 445 446 if (zpci_use_mio(zdev)) 447 return; 448 449 for (i = 0; i < PCI_STD_NUM_BARS; i++) { 450 len = pci_resource_len(pdev, i); 451 if (!len) 452 continue; 453 pci_iounmap_fh(pdev, (void __iomem __force *) 454 pdev->resource[i].start); 455 } 456 } 457 458 static int zpci_alloc_iomap(struct zpci_dev *zdev) 459 { 460 unsigned long entry; 461 462 spin_lock(&zpci_iomap_lock); 463 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES); 464 if (entry == ZPCI_IOMAP_ENTRIES) { 465 spin_unlock(&zpci_iomap_lock); 466 return -ENOSPC; 467 } 468 set_bit(entry, zpci_iomap_bitmap); 469 spin_unlock(&zpci_iomap_lock); 470 return entry; 471 } 472 473 static void zpci_free_iomap(struct zpci_dev *zdev, int entry) 474 { 475 spin_lock(&zpci_iomap_lock); 476 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry)); 477 clear_bit(entry, zpci_iomap_bitmap); 478 spin_unlock(&zpci_iomap_lock); 479 } 480 481 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start, 482 unsigned long size, unsigned long flags) 483 { 484 struct resource *r; 485 486 r = kzalloc(sizeof(*r), GFP_KERNEL); 487 if (!r) 488 return NULL; 489 490 r->start = start; 491 r->end = r->start + size - 1; 492 r->flags = flags; 493 r->name = zdev->res_name; 494 495 if (request_resource(&iomem_resource, r)) { 496 kfree(r); 497 return NULL; 498 } 499 return r; 500 } 501 502 int zpci_setup_bus_resources(struct zpci_dev *zdev, 503 struct list_head *resources) 504 { 505 unsigned long addr, size, flags; 506 struct resource *res; 507 int i, entry; 508 509 snprintf(zdev->res_name, sizeof(zdev->res_name), 510 "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR); 511 512 for (i = 0; i < PCI_STD_NUM_BARS; i++) { 513 if (!zdev->bars[i].size) 514 continue; 515 entry = zpci_alloc_iomap(zdev); 516 if (entry < 0) 517 return entry; 518 zdev->bars[i].map_idx = entry; 519 520 /* only MMIO is supported */ 521 flags = IORESOURCE_MEM; 522 if (zdev->bars[i].val & 8) 523 flags |= IORESOURCE_PREFETCH; 524 if (zdev->bars[i].val & 4) 525 flags |= IORESOURCE_MEM_64; 526 527 if (zpci_use_mio(zdev)) 528 addr = (unsigned long) zdev->bars[i].mio_wt; 529 else 530 addr = ZPCI_ADDR(entry); 531 size = 1UL << zdev->bars[i].size; 532 533 res = __alloc_res(zdev, addr, size, flags); 534 if (!res) { 535 zpci_free_iomap(zdev, entry); 536 return -ENOMEM; 537 } 538 zdev->bars[i].res = res; 539 pci_add_resource(resources, res); 540 } 541 zdev->has_resources = 1; 542 543 return 0; 544 } 545 546 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev) 547 { 548 int i; 549 550 for (i = 0; i < PCI_STD_NUM_BARS; i++) { 551 if (!zdev->bars[i].size || !zdev->bars[i].res) 552 continue; 553 554 zpci_free_iomap(zdev, zdev->bars[i].map_idx); 555 release_resource(zdev->bars[i].res); 556 kfree(zdev->bars[i].res); 557 } 558 zdev->has_resources = 0; 559 } 560 561 int pcibios_add_device(struct pci_dev *pdev) 562 { 563 struct resource *res; 564 int i; 565 566 if (pdev->is_physfn) 567 pdev->no_vf_scan = 1; 568 569 pdev->dev.groups = zpci_attr_groups; 570 pdev->dev.dma_ops = &s390_pci_dma_ops; 571 zpci_map_resources(pdev); 572 573 for (i = 0; i < PCI_STD_NUM_BARS; i++) { 574 res = &pdev->resource[i]; 575 if (res->parent || !res->flags) 576 continue; 577 pci_claim_resource(pdev, i); 578 } 579 580 return 0; 581 } 582 583 void pcibios_release_device(struct pci_dev *pdev) 584 { 585 zpci_unmap_resources(pdev); 586 } 587 588 int pcibios_enable_device(struct pci_dev *pdev, int mask) 589 { 590 struct zpci_dev *zdev = to_zpci(pdev); 591 592 zpci_debug_init_device(zdev, dev_name(&pdev->dev)); 593 zpci_fmb_enable_device(zdev); 594 595 return pci_enable_resources(pdev, mask); 596 } 597 598 void pcibios_disable_device(struct pci_dev *pdev) 599 { 600 struct zpci_dev *zdev = to_zpci(pdev); 601 602 zpci_fmb_disable_device(zdev); 603 zpci_debug_exit_device(zdev); 604 } 605 606 static int __zpci_register_domain(int domain) 607 { 608 spin_lock(&zpci_domain_lock); 609 if (test_bit(domain, zpci_domain)) { 610 spin_unlock(&zpci_domain_lock); 611 pr_err("Domain %04x is already assigned\n", domain); 612 return -EEXIST; 613 } 614 set_bit(domain, zpci_domain); 615 spin_unlock(&zpci_domain_lock); 616 return domain; 617 } 618 619 static int __zpci_alloc_domain(void) 620 { 621 int domain; 622 623 spin_lock(&zpci_domain_lock); 624 /* 625 * We can always auto allocate domains below ZPCI_NR_DEVICES. 626 * There is either a free domain or we have reached the maximum in 627 * which case we would have bailed earlier. 628 */ 629 domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES); 630 set_bit(domain, zpci_domain); 631 spin_unlock(&zpci_domain_lock); 632 return domain; 633 } 634 635 int zpci_alloc_domain(int domain) 636 { 637 if (zpci_unique_uid) { 638 if (domain) 639 return __zpci_register_domain(domain); 640 pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n"); 641 update_uid_checking(false); 642 } 643 return __zpci_alloc_domain(); 644 } 645 646 void zpci_free_domain(int domain) 647 { 648 spin_lock(&zpci_domain_lock); 649 clear_bit(domain, zpci_domain); 650 spin_unlock(&zpci_domain_lock); 651 } 652 653 654 int zpci_enable_device(struct zpci_dev *zdev) 655 { 656 int rc; 657 658 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 659 if (rc) 660 goto out; 661 662 rc = zpci_dma_init_device(zdev); 663 if (rc) 664 goto out_dma; 665 666 return 0; 667 668 out_dma: 669 clp_disable_fh(zdev); 670 out: 671 return rc; 672 } 673 674 int zpci_disable_device(struct zpci_dev *zdev) 675 { 676 zpci_dma_exit_device(zdev); 677 /* 678 * The zPCI function may already be disabled by the platform, this is 679 * detected in clp_disable_fh() which becomes a no-op. 680 */ 681 return clp_disable_fh(zdev); 682 } 683 684 /** 685 * zpci_create_device() - Create a new zpci_dev and add it to the zbus 686 * @fid: Function ID of the device to be created 687 * @fh: Current Function Handle of the device to be created 688 * @state: Initial state after creation either Standby or Configured 689 * 690 * Creates a new zpci device and adds it to its, possibly newly created, zbus 691 * as well as zpci_list. 692 * 693 * Returns: the zdev on success or an error pointer otherwise 694 */ 695 struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state) 696 { 697 struct zpci_dev *zdev; 698 int rc; 699 700 zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, state); 701 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL); 702 if (!zdev) 703 return ERR_PTR(-ENOMEM); 704 705 /* FID and Function Handle are the static/dynamic identifiers */ 706 zdev->fid = fid; 707 zdev->fh = fh; 708 709 /* Query function properties and update zdev */ 710 rc = clp_query_pci_fn(zdev); 711 if (rc) 712 goto error; 713 zdev->state = state; 714 715 kref_init(&zdev->kref); 716 mutex_init(&zdev->lock); 717 718 rc = zpci_init_iommu(zdev); 719 if (rc) 720 goto error; 721 722 rc = zpci_bus_device_register(zdev, &pci_root_ops); 723 if (rc) 724 goto error_destroy_iommu; 725 726 spin_lock(&zpci_list_lock); 727 list_add_tail(&zdev->entry, &zpci_list); 728 spin_unlock(&zpci_list_lock); 729 730 return zdev; 731 732 error_destroy_iommu: 733 zpci_destroy_iommu(zdev); 734 error: 735 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc); 736 kfree(zdev); 737 return ERR_PTR(rc); 738 } 739 740 /** 741 * zpci_scan_configured_device() - Scan a freshly configured zpci_dev 742 * @zdev: The zpci_dev to be configured 743 * @fh: The general function handle supplied by the platform 744 * 745 * Given a device in the configuration state Configured, enables, scans and 746 * adds it to the common code PCI subsystem if possible. If the PCI device is 747 * parked because we can not yet create a PCI bus because we have not seen 748 * function 0, it is ignored but will be scanned once function 0 appears. 749 * If any failure occurs, the zpci_dev is left disabled. 750 * 751 * Return: 0 on success, or an error code otherwise 752 */ 753 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh) 754 { 755 int rc; 756 757 zdev->fh = fh; 758 /* the PCI function will be scanned once function 0 appears */ 759 if (!zdev->zbus->bus) 760 return 0; 761 762 /* For function 0 on a multi-function bus scan whole bus as we might 763 * have to pick up existing functions waiting for it to allow creating 764 * the PCI bus 765 */ 766 if (zdev->devfn == 0 && zdev->zbus->multifunction) 767 rc = zpci_bus_scan_bus(zdev->zbus); 768 else 769 rc = zpci_bus_scan_device(zdev); 770 771 return rc; 772 } 773 774 /** 775 * zpci_deconfigure_device() - Deconfigure a zpci_dev 776 * @zdev: The zpci_dev to configure 777 * 778 * Deconfigure a zPCI function that is currently configured and possibly known 779 * to the common code PCI subsystem. 780 * If any failure occurs the device is left as is. 781 * 782 * Return: 0 on success, or an error code otherwise 783 */ 784 int zpci_deconfigure_device(struct zpci_dev *zdev) 785 { 786 int rc; 787 788 if (zdev->zbus->bus) 789 zpci_bus_remove_device(zdev, false); 790 791 if (zdev_enabled(zdev)) { 792 rc = zpci_disable_device(zdev); 793 if (rc) 794 return rc; 795 } 796 797 rc = sclp_pci_deconfigure(zdev->fid); 798 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, rc); 799 if (rc) 800 return rc; 801 zdev->state = ZPCI_FN_STATE_STANDBY; 802 803 return 0; 804 } 805 806 void zpci_release_device(struct kref *kref) 807 { 808 struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref); 809 int ret; 810 811 if (zdev->zbus->bus) 812 zpci_bus_remove_device(zdev, false); 813 814 if (zdev_enabled(zdev)) 815 zpci_disable_device(zdev); 816 817 switch (zdev->state) { 818 case ZPCI_FN_STATE_CONFIGURED: 819 ret = sclp_pci_deconfigure(zdev->fid); 820 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret); 821 fallthrough; 822 case ZPCI_FN_STATE_STANDBY: 823 if (zdev->has_hp_slot) 824 zpci_exit_slot(zdev); 825 zpci_cleanup_bus_resources(zdev); 826 zpci_bus_device_unregister(zdev); 827 zpci_destroy_iommu(zdev); 828 fallthrough; 829 default: 830 break; 831 } 832 833 spin_lock(&zpci_list_lock); 834 list_del(&zdev->entry); 835 spin_unlock(&zpci_list_lock); 836 zpci_dbg(3, "rem fid:%x\n", zdev->fid); 837 kfree(zdev); 838 } 839 840 int zpci_report_error(struct pci_dev *pdev, 841 struct zpci_report_error_header *report) 842 { 843 struct zpci_dev *zdev = to_zpci(pdev); 844 845 return sclp_pci_report(report, zdev->fh, zdev->fid); 846 } 847 EXPORT_SYMBOL(zpci_report_error); 848 849 static int zpci_mem_init(void) 850 { 851 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) || 852 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb)); 853 854 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb), 855 __alignof__(struct zpci_fmb), 0, NULL); 856 if (!zdev_fmb_cache) 857 goto error_fmb; 858 859 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES, 860 sizeof(*zpci_iomap_start), GFP_KERNEL); 861 if (!zpci_iomap_start) 862 goto error_iomap; 863 864 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES), 865 sizeof(*zpci_iomap_bitmap), GFP_KERNEL); 866 if (!zpci_iomap_bitmap) 867 goto error_iomap_bitmap; 868 869 if (static_branch_likely(&have_mio)) 870 clp_setup_writeback_mio(); 871 872 return 0; 873 error_iomap_bitmap: 874 kfree(zpci_iomap_start); 875 error_iomap: 876 kmem_cache_destroy(zdev_fmb_cache); 877 error_fmb: 878 return -ENOMEM; 879 } 880 881 static void zpci_mem_exit(void) 882 { 883 kfree(zpci_iomap_bitmap); 884 kfree(zpci_iomap_start); 885 kmem_cache_destroy(zdev_fmb_cache); 886 } 887 888 static unsigned int s390_pci_probe __initdata = 1; 889 static unsigned int s390_pci_no_mio __initdata; 890 unsigned int s390_pci_force_floating __initdata; 891 static unsigned int s390_pci_initialized; 892 893 char * __init pcibios_setup(char *str) 894 { 895 if (!strcmp(str, "off")) { 896 s390_pci_probe = 0; 897 return NULL; 898 } 899 if (!strcmp(str, "nomio")) { 900 s390_pci_no_mio = 1; 901 return NULL; 902 } 903 if (!strcmp(str, "force_floating")) { 904 s390_pci_force_floating = 1; 905 return NULL; 906 } 907 if (!strcmp(str, "norid")) { 908 s390_pci_no_rid = 1; 909 return NULL; 910 } 911 return str; 912 } 913 914 bool zpci_is_enabled(void) 915 { 916 return s390_pci_initialized; 917 } 918 919 static int __init pci_base_init(void) 920 { 921 int rc; 922 923 if (!s390_pci_probe) 924 return 0; 925 926 if (!test_facility(69) || !test_facility(71)) { 927 pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n"); 928 return 0; 929 } 930 931 if (test_facility(153) && !s390_pci_no_mio) { 932 static_branch_enable(&have_mio); 933 ctl_set_bit(2, 5); 934 } 935 936 rc = zpci_debug_init(); 937 if (rc) 938 goto out; 939 940 rc = zpci_mem_init(); 941 if (rc) 942 goto out_mem; 943 944 rc = zpci_irq_init(); 945 if (rc) 946 goto out_irq; 947 948 rc = zpci_dma_init(); 949 if (rc) 950 goto out_dma; 951 952 rc = clp_scan_pci_devices(); 953 if (rc) 954 goto out_find; 955 zpci_bus_scan_busses(); 956 957 s390_pci_initialized = 1; 958 return 0; 959 960 out_find: 961 zpci_dma_exit(); 962 out_dma: 963 zpci_irq_exit(); 964 out_irq: 965 zpci_mem_exit(); 966 out_mem: 967 zpci_debug_exit(); 968 out: 969 return rc; 970 } 971 subsys_initcall_sync(pci_base_init); 972