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