1 /* 2 * Copyright IBM Corp. 2012 3 * 4 * Author(s): 5 * Jan Glauber <jang@linux.vnet.ibm.com> 6 * 7 * The System z PCI code is a rewrite from a prototype by 8 * the following people (Kudoz!): 9 * Alexander Schmidt 10 * Christoph Raisch 11 * Hannes Hering 12 * Hoang-Nam Nguyen 13 * Jan-Bernd Themann 14 * Stefan Roscher 15 * Thomas Klein 16 */ 17 18 #define KMSG_COMPONENT "zpci" 19 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 20 21 #include <linux/kernel.h> 22 #include <linux/slab.h> 23 #include <linux/err.h> 24 #include <linux/export.h> 25 #include <linux/delay.h> 26 #include <linux/irq.h> 27 #include <linux/kernel_stat.h> 28 #include <linux/seq_file.h> 29 #include <linux/pci.h> 30 #include <linux/msi.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 #define DEBUG /* enable pr_debug */ 40 41 #define SIC_IRQ_MODE_ALL 0 42 #define SIC_IRQ_MODE_SINGLE 1 43 44 #define ZPCI_NR_DMA_SPACES 1 45 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS 46 47 /* list of all detected zpci devices */ 48 static LIST_HEAD(zpci_list); 49 static DEFINE_SPINLOCK(zpci_list_lock); 50 51 static struct irq_chip zpci_irq_chip = { 52 .name = "zPCI", 53 .irq_unmask = pci_msi_unmask_irq, 54 .irq_mask = pci_msi_mask_irq, 55 }; 56 57 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES); 58 static DEFINE_SPINLOCK(zpci_domain_lock); 59 60 static struct airq_iv *zpci_aisb_iv; 61 static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES]; 62 63 /* Adapter interrupt definitions */ 64 static void zpci_irq_handler(struct airq_struct *airq); 65 66 static struct airq_struct zpci_airq = { 67 .handler = zpci_irq_handler, 68 .isc = PCI_ISC, 69 }; 70 71 #define ZPCI_IOMAP_ENTRIES \ 72 min(((unsigned long) CONFIG_PCI_NR_FUNCTIONS * PCI_BAR_COUNT), \ 73 ZPCI_IOMAP_MAX_ENTRIES) 74 75 static DEFINE_SPINLOCK(zpci_iomap_lock); 76 static unsigned long *zpci_iomap_bitmap; 77 struct zpci_iomap_entry *zpci_iomap_start; 78 EXPORT_SYMBOL_GPL(zpci_iomap_start); 79 80 static struct kmem_cache *zdev_fmb_cache; 81 82 struct zpci_dev *get_zdev_by_fid(u32 fid) 83 { 84 struct zpci_dev *tmp, *zdev = NULL; 85 86 spin_lock(&zpci_list_lock); 87 list_for_each_entry(tmp, &zpci_list, entry) { 88 if (tmp->fid == fid) { 89 zdev = tmp; 90 break; 91 } 92 } 93 spin_unlock(&zpci_list_lock); 94 return zdev; 95 } 96 97 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus) 98 { 99 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL; 100 } 101 102 int pci_domain_nr(struct pci_bus *bus) 103 { 104 return ((struct zpci_dev *) bus->sysdata)->domain; 105 } 106 EXPORT_SYMBOL_GPL(pci_domain_nr); 107 108 int pci_proc_domain(struct pci_bus *bus) 109 { 110 return pci_domain_nr(bus); 111 } 112 EXPORT_SYMBOL_GPL(pci_proc_domain); 113 114 /* Modify PCI: Register adapter interruptions */ 115 static int zpci_set_airq(struct zpci_dev *zdev) 116 { 117 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT); 118 struct zpci_fib fib = {0}; 119 120 fib.isc = PCI_ISC; 121 fib.sum = 1; /* enable summary notifications */ 122 fib.noi = airq_iv_end(zdev->aibv); 123 fib.aibv = (unsigned long) zdev->aibv->vector; 124 fib.aibvo = 0; /* each zdev has its own interrupt vector */ 125 fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8; 126 fib.aisbo = zdev->aisb & 63; 127 128 return zpci_mod_fc(req, &fib); 129 } 130 131 struct mod_pci_args { 132 u64 base; 133 u64 limit; 134 u64 iota; 135 u64 fmb_addr; 136 }; 137 138 static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args) 139 { 140 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn); 141 struct zpci_fib fib = {0}; 142 143 fib.pba = args->base; 144 fib.pal = args->limit; 145 fib.iota = args->iota; 146 fib.fmb_addr = args->fmb_addr; 147 148 return zpci_mod_fc(req, &fib); 149 } 150 151 /* Modify PCI: Register I/O address translation parameters */ 152 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas, 153 u64 base, u64 limit, u64 iota) 154 { 155 struct mod_pci_args args = { base, limit, iota, 0 }; 156 157 WARN_ON_ONCE(iota & 0x3fff); 158 args.iota |= ZPCI_IOTA_RTTO_FLAG; 159 return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args); 160 } 161 162 /* Modify PCI: Unregister I/O address translation parameters */ 163 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas) 164 { 165 struct mod_pci_args args = { 0, 0, 0, 0 }; 166 167 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args); 168 } 169 170 /* Modify PCI: Unregister adapter interruptions */ 171 static int zpci_clear_airq(struct zpci_dev *zdev) 172 { 173 struct mod_pci_args args = { 0, 0, 0, 0 }; 174 175 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args); 176 } 177 178 /* Modify PCI: Set PCI function measurement parameters */ 179 int zpci_fmb_enable_device(struct zpci_dev *zdev) 180 { 181 struct mod_pci_args args = { 0, 0, 0, 0 }; 182 183 if (zdev->fmb) 184 return -EINVAL; 185 186 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL); 187 if (!zdev->fmb) 188 return -ENOMEM; 189 WARN_ON((u64) zdev->fmb & 0xf); 190 191 /* reset software counters */ 192 atomic64_set(&zdev->allocated_pages, 0); 193 atomic64_set(&zdev->mapped_pages, 0); 194 atomic64_set(&zdev->unmapped_pages, 0); 195 196 args.fmb_addr = virt_to_phys(zdev->fmb); 197 return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args); 198 } 199 200 /* Modify PCI: Disable PCI function measurement */ 201 int zpci_fmb_disable_device(struct zpci_dev *zdev) 202 { 203 struct mod_pci_args args = { 0, 0, 0, 0 }; 204 int rc; 205 206 if (!zdev->fmb) 207 return -EINVAL; 208 209 /* Function measurement is disabled if fmb address is zero */ 210 rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args); 211 212 kmem_cache_free(zdev_fmb_cache, zdev->fmb); 213 zdev->fmb = NULL; 214 return rc; 215 } 216 217 #define ZPCI_PCIAS_CFGSPC 15 218 219 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len) 220 { 221 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len); 222 u64 data; 223 int rc; 224 225 rc = zpci_load(&data, req, offset); 226 if (!rc) { 227 data = data << ((8 - len) * 8); 228 data = le64_to_cpu(data); 229 *val = (u32) data; 230 } else 231 *val = 0xffffffff; 232 return rc; 233 } 234 235 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len) 236 { 237 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len); 238 u64 data = val; 239 int rc; 240 241 data = cpu_to_le64(data); 242 data = data >> ((8 - len) * 8); 243 rc = zpci_store(data, req, offset); 244 return rc; 245 } 246 247 void pcibios_fixup_bus(struct pci_bus *bus) 248 { 249 } 250 251 resource_size_t pcibios_align_resource(void *data, const struct resource *res, 252 resource_size_t size, 253 resource_size_t align) 254 { 255 return 0; 256 } 257 258 /* combine single writes by using store-block insn */ 259 void __iowrite64_copy(void __iomem *to, const void *from, size_t count) 260 { 261 zpci_memcpy_toio(to, from, count); 262 } 263 264 /* Create a virtual mapping cookie for a PCI BAR */ 265 void __iomem *pci_iomap_range(struct pci_dev *pdev, 266 int bar, 267 unsigned long offset, 268 unsigned long max) 269 { 270 struct zpci_dev *zdev = to_zpci(pdev); 271 int idx; 272 273 if (!pci_resource_len(pdev, bar)) 274 return NULL; 275 276 idx = zdev->bars[bar].map_idx; 277 spin_lock(&zpci_iomap_lock); 278 /* Detect overrun */ 279 WARN_ON(!++zpci_iomap_start[idx].count); 280 zpci_iomap_start[idx].fh = zdev->fh; 281 zpci_iomap_start[idx].bar = bar; 282 spin_unlock(&zpci_iomap_lock); 283 284 return (void __iomem *) ZPCI_ADDR(idx) + offset; 285 } 286 EXPORT_SYMBOL(pci_iomap_range); 287 288 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) 289 { 290 return pci_iomap_range(dev, bar, 0, maxlen); 291 } 292 EXPORT_SYMBOL(pci_iomap); 293 294 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr) 295 { 296 unsigned int idx = ZPCI_IDX(addr); 297 298 spin_lock(&zpci_iomap_lock); 299 /* Detect underrun */ 300 WARN_ON(!zpci_iomap_start[idx].count); 301 if (!--zpci_iomap_start[idx].count) { 302 zpci_iomap_start[idx].fh = 0; 303 zpci_iomap_start[idx].bar = 0; 304 } 305 spin_unlock(&zpci_iomap_lock); 306 } 307 EXPORT_SYMBOL(pci_iounmap); 308 309 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, 310 int size, u32 *val) 311 { 312 struct zpci_dev *zdev = get_zdev_by_bus(bus); 313 int ret; 314 315 if (!zdev || devfn != ZPCI_DEVFN) 316 ret = -ENODEV; 317 else 318 ret = zpci_cfg_load(zdev, where, val, size); 319 320 return ret; 321 } 322 323 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, 324 int size, u32 val) 325 { 326 struct zpci_dev *zdev = get_zdev_by_bus(bus); 327 int ret; 328 329 if (!zdev || devfn != ZPCI_DEVFN) 330 ret = -ENODEV; 331 else 332 ret = zpci_cfg_store(zdev, where, val, size); 333 334 return ret; 335 } 336 337 static struct pci_ops pci_root_ops = { 338 .read = pci_read, 339 .write = pci_write, 340 }; 341 342 static void zpci_irq_handler(struct airq_struct *airq) 343 { 344 unsigned long si, ai; 345 struct airq_iv *aibv; 346 int irqs_on = 0; 347 348 inc_irq_stat(IRQIO_PCI); 349 for (si = 0;;) { 350 /* Scan adapter summary indicator bit vector */ 351 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv)); 352 if (si == -1UL) { 353 if (irqs_on++) 354 /* End of second scan with interrupts on. */ 355 break; 356 /* First scan complete, reenable interrupts. */ 357 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); 358 si = 0; 359 continue; 360 } 361 362 /* Scan the adapter interrupt vector for this device. */ 363 aibv = zpci_aibv[si]; 364 for (ai = 0;;) { 365 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv)); 366 if (ai == -1UL) 367 break; 368 inc_irq_stat(IRQIO_MSI); 369 airq_iv_lock(aibv, ai); 370 generic_handle_irq(airq_iv_get_data(aibv, ai)); 371 airq_iv_unlock(aibv, ai); 372 } 373 } 374 } 375 376 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) 377 { 378 struct zpci_dev *zdev = to_zpci(pdev); 379 unsigned int hwirq, msi_vecs; 380 unsigned long aisb; 381 struct msi_desc *msi; 382 struct msi_msg msg; 383 int rc, irq; 384 385 if (type == PCI_CAP_ID_MSI && nvec > 1) 386 return 1; 387 msi_vecs = min_t(unsigned int, nvec, zdev->max_msi); 388 389 /* Allocate adapter summary indicator bit */ 390 rc = -EIO; 391 aisb = airq_iv_alloc_bit(zpci_aisb_iv); 392 if (aisb == -1UL) 393 goto out; 394 zdev->aisb = aisb; 395 396 /* Create adapter interrupt vector */ 397 rc = -ENOMEM; 398 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK); 399 if (!zdev->aibv) 400 goto out_si; 401 402 /* Wire up shortcut pointer */ 403 zpci_aibv[aisb] = zdev->aibv; 404 405 /* Request MSI interrupts */ 406 hwirq = 0; 407 for_each_pci_msi_entry(msi, pdev) { 408 rc = -EIO; 409 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */ 410 if (irq < 0) 411 goto out_msi; 412 rc = irq_set_msi_desc(irq, msi); 413 if (rc) 414 goto out_msi; 415 irq_set_chip_and_handler(irq, &zpci_irq_chip, 416 handle_simple_irq); 417 msg.data = hwirq; 418 msg.address_lo = zdev->msi_addr & 0xffffffff; 419 msg.address_hi = zdev->msi_addr >> 32; 420 pci_write_msi_msg(irq, &msg); 421 airq_iv_set_data(zdev->aibv, hwirq, irq); 422 hwirq++; 423 } 424 425 /* Enable adapter interrupts */ 426 rc = zpci_set_airq(zdev); 427 if (rc) 428 goto out_msi; 429 430 return (msi_vecs == nvec) ? 0 : msi_vecs; 431 432 out_msi: 433 for_each_pci_msi_entry(msi, pdev) { 434 if (hwirq-- == 0) 435 break; 436 irq_set_msi_desc(msi->irq, NULL); 437 irq_free_desc(msi->irq); 438 msi->msg.address_lo = 0; 439 msi->msg.address_hi = 0; 440 msi->msg.data = 0; 441 msi->irq = 0; 442 } 443 zpci_aibv[aisb] = NULL; 444 airq_iv_release(zdev->aibv); 445 out_si: 446 airq_iv_free_bit(zpci_aisb_iv, aisb); 447 out: 448 return rc; 449 } 450 451 void arch_teardown_msi_irqs(struct pci_dev *pdev) 452 { 453 struct zpci_dev *zdev = to_zpci(pdev); 454 struct msi_desc *msi; 455 int rc; 456 457 /* Disable adapter interrupts */ 458 rc = zpci_clear_airq(zdev); 459 if (rc) 460 return; 461 462 /* Release MSI interrupts */ 463 for_each_pci_msi_entry(msi, pdev) { 464 if (msi->msi_attrib.is_msix) 465 __pci_msix_desc_mask_irq(msi, 1); 466 else 467 __pci_msi_desc_mask_irq(msi, 1, 1); 468 irq_set_msi_desc(msi->irq, NULL); 469 irq_free_desc(msi->irq); 470 msi->msg.address_lo = 0; 471 msi->msg.address_hi = 0; 472 msi->msg.data = 0; 473 msi->irq = 0; 474 } 475 476 zpci_aibv[zdev->aisb] = NULL; 477 airq_iv_release(zdev->aibv); 478 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb); 479 } 480 481 static void zpci_map_resources(struct pci_dev *pdev) 482 { 483 resource_size_t len; 484 int i; 485 486 for (i = 0; i < PCI_BAR_COUNT; i++) { 487 len = pci_resource_len(pdev, i); 488 if (!len) 489 continue; 490 pdev->resource[i].start = 491 (resource_size_t __force) pci_iomap(pdev, i, 0); 492 pdev->resource[i].end = pdev->resource[i].start + len - 1; 493 } 494 } 495 496 static void zpci_unmap_resources(struct pci_dev *pdev) 497 { 498 resource_size_t len; 499 int i; 500 501 for (i = 0; i < PCI_BAR_COUNT; i++) { 502 len = pci_resource_len(pdev, i); 503 if (!len) 504 continue; 505 pci_iounmap(pdev, (void __iomem __force *) 506 pdev->resource[i].start); 507 } 508 } 509 510 static int __init zpci_irq_init(void) 511 { 512 int rc; 513 514 rc = register_adapter_interrupt(&zpci_airq); 515 if (rc) 516 goto out; 517 /* Set summary to 1 to be called every time for the ISC. */ 518 *zpci_airq.lsi_ptr = 1; 519 520 rc = -ENOMEM; 521 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC); 522 if (!zpci_aisb_iv) 523 goto out_airq; 524 525 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); 526 return 0; 527 528 out_airq: 529 unregister_adapter_interrupt(&zpci_airq); 530 out: 531 return rc; 532 } 533 534 static void zpci_irq_exit(void) 535 { 536 airq_iv_release(zpci_aisb_iv); 537 unregister_adapter_interrupt(&zpci_airq); 538 } 539 540 static int zpci_alloc_iomap(struct zpci_dev *zdev) 541 { 542 unsigned long entry; 543 544 spin_lock(&zpci_iomap_lock); 545 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES); 546 if (entry == ZPCI_IOMAP_ENTRIES) { 547 spin_unlock(&zpci_iomap_lock); 548 return -ENOSPC; 549 } 550 set_bit(entry, zpci_iomap_bitmap); 551 spin_unlock(&zpci_iomap_lock); 552 return entry; 553 } 554 555 static void zpci_free_iomap(struct zpci_dev *zdev, int entry) 556 { 557 spin_lock(&zpci_iomap_lock); 558 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry)); 559 clear_bit(entry, zpci_iomap_bitmap); 560 spin_unlock(&zpci_iomap_lock); 561 } 562 563 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start, 564 unsigned long size, unsigned long flags) 565 { 566 struct resource *r; 567 568 r = kzalloc(sizeof(*r), GFP_KERNEL); 569 if (!r) 570 return NULL; 571 572 r->start = start; 573 r->end = r->start + size - 1; 574 r->flags = flags; 575 r->name = zdev->res_name; 576 577 if (request_resource(&iomem_resource, r)) { 578 kfree(r); 579 return NULL; 580 } 581 return r; 582 } 583 584 static int zpci_setup_bus_resources(struct zpci_dev *zdev, 585 struct list_head *resources) 586 { 587 unsigned long addr, size, flags; 588 struct resource *res; 589 int i, entry; 590 591 snprintf(zdev->res_name, sizeof(zdev->res_name), 592 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR); 593 594 for (i = 0; i < PCI_BAR_COUNT; i++) { 595 if (!zdev->bars[i].size) 596 continue; 597 entry = zpci_alloc_iomap(zdev); 598 if (entry < 0) 599 return entry; 600 zdev->bars[i].map_idx = entry; 601 602 /* only MMIO is supported */ 603 flags = IORESOURCE_MEM; 604 if (zdev->bars[i].val & 8) 605 flags |= IORESOURCE_PREFETCH; 606 if (zdev->bars[i].val & 4) 607 flags |= IORESOURCE_MEM_64; 608 609 addr = ZPCI_ADDR(entry); 610 size = 1UL << zdev->bars[i].size; 611 612 res = __alloc_res(zdev, addr, size, flags); 613 if (!res) { 614 zpci_free_iomap(zdev, entry); 615 return -ENOMEM; 616 } 617 zdev->bars[i].res = res; 618 pci_add_resource(resources, res); 619 } 620 621 return 0; 622 } 623 624 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev) 625 { 626 int i; 627 628 for (i = 0; i < PCI_BAR_COUNT; i++) { 629 if (!zdev->bars[i].size || !zdev->bars[i].res) 630 continue; 631 632 zpci_free_iomap(zdev, zdev->bars[i].map_idx); 633 release_resource(zdev->bars[i].res); 634 kfree(zdev->bars[i].res); 635 } 636 } 637 638 int pcibios_add_device(struct pci_dev *pdev) 639 { 640 struct resource *res; 641 int i; 642 643 pdev->dev.groups = zpci_attr_groups; 644 pdev->dev.archdata.dma_ops = &s390_pci_dma_ops; 645 zpci_map_resources(pdev); 646 647 for (i = 0; i < PCI_BAR_COUNT; i++) { 648 res = &pdev->resource[i]; 649 if (res->parent || !res->flags) 650 continue; 651 pci_claim_resource(pdev, i); 652 } 653 654 return 0; 655 } 656 657 void pcibios_release_device(struct pci_dev *pdev) 658 { 659 zpci_unmap_resources(pdev); 660 } 661 662 int pcibios_enable_device(struct pci_dev *pdev, int mask) 663 { 664 struct zpci_dev *zdev = to_zpci(pdev); 665 666 zpci_debug_init_device(zdev, dev_name(&pdev->dev)); 667 zpci_fmb_enable_device(zdev); 668 669 return pci_enable_resources(pdev, mask); 670 } 671 672 void pcibios_disable_device(struct pci_dev *pdev) 673 { 674 struct zpci_dev *zdev = to_zpci(pdev); 675 676 zpci_fmb_disable_device(zdev); 677 zpci_debug_exit_device(zdev); 678 } 679 680 #ifdef CONFIG_HIBERNATE_CALLBACKS 681 static int zpci_restore(struct device *dev) 682 { 683 struct pci_dev *pdev = to_pci_dev(dev); 684 struct zpci_dev *zdev = to_zpci(pdev); 685 int ret = 0; 686 687 if (zdev->state != ZPCI_FN_STATE_ONLINE) 688 goto out; 689 690 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 691 if (ret) 692 goto out; 693 694 zpci_map_resources(pdev); 695 zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma, 696 (u64) zdev->dma_table); 697 698 out: 699 return ret; 700 } 701 702 static int zpci_freeze(struct device *dev) 703 { 704 struct pci_dev *pdev = to_pci_dev(dev); 705 struct zpci_dev *zdev = to_zpci(pdev); 706 707 if (zdev->state != ZPCI_FN_STATE_ONLINE) 708 return 0; 709 710 zpci_unregister_ioat(zdev, 0); 711 zpci_unmap_resources(pdev); 712 return clp_disable_fh(zdev); 713 } 714 715 struct dev_pm_ops pcibios_pm_ops = { 716 .thaw_noirq = zpci_restore, 717 .freeze_noirq = zpci_freeze, 718 .restore_noirq = zpci_restore, 719 .poweroff_noirq = zpci_freeze, 720 }; 721 #endif /* CONFIG_HIBERNATE_CALLBACKS */ 722 723 static int zpci_alloc_domain(struct zpci_dev *zdev) 724 { 725 spin_lock(&zpci_domain_lock); 726 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES); 727 if (zdev->domain == ZPCI_NR_DEVICES) { 728 spin_unlock(&zpci_domain_lock); 729 return -ENOSPC; 730 } 731 set_bit(zdev->domain, zpci_domain); 732 spin_unlock(&zpci_domain_lock); 733 return 0; 734 } 735 736 static void zpci_free_domain(struct zpci_dev *zdev) 737 { 738 spin_lock(&zpci_domain_lock); 739 clear_bit(zdev->domain, zpci_domain); 740 spin_unlock(&zpci_domain_lock); 741 } 742 743 void pcibios_remove_bus(struct pci_bus *bus) 744 { 745 struct zpci_dev *zdev = get_zdev_by_bus(bus); 746 747 zpci_exit_slot(zdev); 748 zpci_cleanup_bus_resources(zdev); 749 zpci_free_domain(zdev); 750 751 spin_lock(&zpci_list_lock); 752 list_del(&zdev->entry); 753 spin_unlock(&zpci_list_lock); 754 755 kfree(zdev); 756 } 757 758 static int zpci_scan_bus(struct zpci_dev *zdev) 759 { 760 LIST_HEAD(resources); 761 int ret; 762 763 ret = zpci_setup_bus_resources(zdev, &resources); 764 if (ret) 765 goto error; 766 767 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops, 768 zdev, &resources); 769 if (!zdev->bus) { 770 ret = -EIO; 771 goto error; 772 } 773 zdev->bus->max_bus_speed = zdev->max_bus_speed; 774 pci_bus_add_devices(zdev->bus); 775 return 0; 776 777 error: 778 zpci_cleanup_bus_resources(zdev); 779 pci_free_resource_list(&resources); 780 return ret; 781 } 782 783 int zpci_enable_device(struct zpci_dev *zdev) 784 { 785 int rc; 786 787 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 788 if (rc) 789 goto out; 790 791 rc = zpci_dma_init_device(zdev); 792 if (rc) 793 goto out_dma; 794 795 zdev->state = ZPCI_FN_STATE_ONLINE; 796 return 0; 797 798 out_dma: 799 clp_disable_fh(zdev); 800 out: 801 return rc; 802 } 803 EXPORT_SYMBOL_GPL(zpci_enable_device); 804 805 int zpci_disable_device(struct zpci_dev *zdev) 806 { 807 zpci_dma_exit_device(zdev); 808 return clp_disable_fh(zdev); 809 } 810 EXPORT_SYMBOL_GPL(zpci_disable_device); 811 812 int zpci_create_device(struct zpci_dev *zdev) 813 { 814 int rc; 815 816 rc = zpci_alloc_domain(zdev); 817 if (rc) 818 goto out; 819 820 mutex_init(&zdev->lock); 821 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) { 822 rc = zpci_enable_device(zdev); 823 if (rc) 824 goto out_free; 825 } 826 rc = zpci_scan_bus(zdev); 827 if (rc) 828 goto out_disable; 829 830 spin_lock(&zpci_list_lock); 831 list_add_tail(&zdev->entry, &zpci_list); 832 spin_unlock(&zpci_list_lock); 833 834 zpci_init_slot(zdev); 835 836 return 0; 837 838 out_disable: 839 if (zdev->state == ZPCI_FN_STATE_ONLINE) 840 zpci_disable_device(zdev); 841 out_free: 842 zpci_free_domain(zdev); 843 out: 844 return rc; 845 } 846 847 void zpci_stop_device(struct zpci_dev *zdev) 848 { 849 zpci_dma_exit_device(zdev); 850 /* 851 * Note: SCLP disables fh via set-pci-fn so don't 852 * do that here. 853 */ 854 } 855 EXPORT_SYMBOL_GPL(zpci_stop_device); 856 857 static inline int barsize(u8 size) 858 { 859 return (size) ? (1 << size) >> 10 : 0; 860 } 861 862 static int zpci_mem_init(void) 863 { 864 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) || 865 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb)); 866 867 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb), 868 __alignof__(struct zpci_fmb), 0, NULL); 869 if (!zdev_fmb_cache) 870 goto error_fmb; 871 872 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES, 873 sizeof(*zpci_iomap_start), GFP_KERNEL); 874 if (!zpci_iomap_start) 875 goto error_iomap; 876 877 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES), 878 sizeof(*zpci_iomap_bitmap), GFP_KERNEL); 879 if (!zpci_iomap_bitmap) 880 goto error_iomap_bitmap; 881 882 return 0; 883 error_iomap_bitmap: 884 kfree(zpci_iomap_start); 885 error_iomap: 886 kmem_cache_destroy(zdev_fmb_cache); 887 error_fmb: 888 return -ENOMEM; 889 } 890 891 static void zpci_mem_exit(void) 892 { 893 kfree(zpci_iomap_bitmap); 894 kfree(zpci_iomap_start); 895 kmem_cache_destroy(zdev_fmb_cache); 896 } 897 898 static unsigned int s390_pci_probe = 1; 899 static unsigned int s390_pci_initialized; 900 901 char * __init pcibios_setup(char *str) 902 { 903 if (!strcmp(str, "off")) { 904 s390_pci_probe = 0; 905 return NULL; 906 } 907 return str; 908 } 909 910 bool zpci_is_enabled(void) 911 { 912 return s390_pci_initialized; 913 } 914 915 static int __init pci_base_init(void) 916 { 917 int rc; 918 919 if (!s390_pci_probe) 920 return 0; 921 922 if (!test_facility(69) || !test_facility(71) || !test_facility(72)) 923 return 0; 924 925 rc = zpci_debug_init(); 926 if (rc) 927 goto out; 928 929 rc = zpci_mem_init(); 930 if (rc) 931 goto out_mem; 932 933 rc = zpci_irq_init(); 934 if (rc) 935 goto out_irq; 936 937 rc = zpci_dma_init(); 938 if (rc) 939 goto out_dma; 940 941 rc = clp_scan_pci_devices(); 942 if (rc) 943 goto out_find; 944 945 s390_pci_initialized = 1; 946 return 0; 947 948 out_find: 949 zpci_dma_exit(); 950 out_dma: 951 zpci_irq_exit(); 952 out_irq: 953 zpci_mem_exit(); 954 out_mem: 955 zpci_debug_exit(); 956 out: 957 return rc; 958 } 959 subsys_initcall_sync(pci_base_init); 960 961 void zpci_rescan(void) 962 { 963 if (zpci_is_enabled()) 964 clp_rescan_pci_devices_simple(); 965 } 966