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_range(struct pci_dev *pdev, 263 int bar, 264 unsigned long offset, 265 unsigned long max) 266 { 267 struct zpci_dev *zdev = get_zdev(pdev); 268 u64 addr; 269 int idx; 270 271 if ((bar & 7) != bar) 272 return NULL; 273 274 idx = zdev->bars[bar].map_idx; 275 spin_lock(&zpci_iomap_lock); 276 if (zpci_iomap_start[idx].count++) { 277 BUG_ON(zpci_iomap_start[idx].fh != zdev->fh || 278 zpci_iomap_start[idx].bar != bar); 279 } else { 280 zpci_iomap_start[idx].fh = zdev->fh; 281 zpci_iomap_start[idx].bar = bar; 282 } 283 /* Detect overrun */ 284 BUG_ON(!zpci_iomap_start[idx].count); 285 spin_unlock(&zpci_iomap_lock); 286 287 addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48); 288 return (void __iomem *) addr + offset; 289 } 290 EXPORT_SYMBOL_GPL(pci_iomap_range); 291 292 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) 293 { 294 return pci_iomap_range(dev, bar, 0, maxlen); 295 } 296 EXPORT_SYMBOL(pci_iomap); 297 298 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr) 299 { 300 unsigned int idx; 301 302 idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48; 303 spin_lock(&zpci_iomap_lock); 304 /* Detect underrun */ 305 BUG_ON(!zpci_iomap_start[idx].count); 306 if (!--zpci_iomap_start[idx].count) { 307 zpci_iomap_start[idx].fh = 0; 308 zpci_iomap_start[idx].bar = 0; 309 } 310 spin_unlock(&zpci_iomap_lock); 311 } 312 EXPORT_SYMBOL_GPL(pci_iounmap); 313 314 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, 315 int size, u32 *val) 316 { 317 struct zpci_dev *zdev = get_zdev_by_bus(bus); 318 int ret; 319 320 if (!zdev || devfn != ZPCI_DEVFN) 321 ret = -ENODEV; 322 else 323 ret = zpci_cfg_load(zdev, where, val, size); 324 325 return ret; 326 } 327 328 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, 329 int size, u32 val) 330 { 331 struct zpci_dev *zdev = get_zdev_by_bus(bus); 332 int ret; 333 334 if (!zdev || devfn != ZPCI_DEVFN) 335 ret = -ENODEV; 336 else 337 ret = zpci_cfg_store(zdev, where, val, size); 338 339 return ret; 340 } 341 342 static struct pci_ops pci_root_ops = { 343 .read = pci_read, 344 .write = pci_write, 345 }; 346 347 static void zpci_irq_handler(struct airq_struct *airq) 348 { 349 unsigned long si, ai; 350 struct airq_iv *aibv; 351 int irqs_on = 0; 352 353 inc_irq_stat(IRQIO_PCI); 354 for (si = 0;;) { 355 /* Scan adapter summary indicator bit vector */ 356 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv)); 357 if (si == -1UL) { 358 if (irqs_on++) 359 /* End of second scan with interrupts on. */ 360 break; 361 /* First scan complete, reenable interrupts. */ 362 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); 363 si = 0; 364 continue; 365 } 366 367 /* Scan the adapter interrupt vector for this device. */ 368 aibv = zpci_aibv[si]; 369 for (ai = 0;;) { 370 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv)); 371 if (ai == -1UL) 372 break; 373 inc_irq_stat(IRQIO_MSI); 374 airq_iv_lock(aibv, ai); 375 generic_handle_irq(airq_iv_get_data(aibv, ai)); 376 airq_iv_unlock(aibv, ai); 377 } 378 } 379 } 380 381 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) 382 { 383 struct zpci_dev *zdev = get_zdev(pdev); 384 unsigned int hwirq, msi_vecs; 385 unsigned long aisb; 386 struct msi_desc *msi; 387 struct msi_msg msg; 388 int rc, irq; 389 390 if (type == PCI_CAP_ID_MSI && nvec > 1) 391 return 1; 392 msi_vecs = min_t(unsigned int, nvec, zdev->max_msi); 393 394 /* Allocate adapter summary indicator bit */ 395 rc = -EIO; 396 aisb = airq_iv_alloc_bit(zpci_aisb_iv); 397 if (aisb == -1UL) 398 goto out; 399 zdev->aisb = aisb; 400 401 /* Create adapter interrupt vector */ 402 rc = -ENOMEM; 403 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK); 404 if (!zdev->aibv) 405 goto out_si; 406 407 /* Wire up shortcut pointer */ 408 zpci_aibv[aisb] = zdev->aibv; 409 410 /* Request MSI interrupts */ 411 hwirq = 0; 412 list_for_each_entry(msi, &pdev->msi_list, list) { 413 rc = -EIO; 414 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */ 415 if (irq < 0) 416 goto out_msi; 417 rc = irq_set_msi_desc(irq, msi); 418 if (rc) 419 goto out_msi; 420 irq_set_chip_and_handler(irq, &zpci_irq_chip, 421 handle_simple_irq); 422 msg.data = hwirq; 423 msg.address_lo = zdev->msi_addr & 0xffffffff; 424 msg.address_hi = zdev->msi_addr >> 32; 425 pci_write_msi_msg(irq, &msg); 426 airq_iv_set_data(zdev->aibv, hwirq, irq); 427 hwirq++; 428 } 429 430 /* Enable adapter interrupts */ 431 rc = zpci_set_airq(zdev); 432 if (rc) 433 goto out_msi; 434 435 return (msi_vecs == nvec) ? 0 : msi_vecs; 436 437 out_msi: 438 list_for_each_entry(msi, &pdev->msi_list, list) { 439 if (hwirq-- == 0) 440 break; 441 irq_set_msi_desc(msi->irq, NULL); 442 irq_free_desc(msi->irq); 443 msi->msg.address_lo = 0; 444 msi->msg.address_hi = 0; 445 msi->msg.data = 0; 446 msi->irq = 0; 447 } 448 zpci_aibv[aisb] = NULL; 449 airq_iv_release(zdev->aibv); 450 out_si: 451 airq_iv_free_bit(zpci_aisb_iv, aisb); 452 out: 453 return rc; 454 } 455 456 void arch_teardown_msi_irqs(struct pci_dev *pdev) 457 { 458 struct zpci_dev *zdev = get_zdev(pdev); 459 struct msi_desc *msi; 460 int rc; 461 462 /* Disable adapter interrupts */ 463 rc = zpci_clear_airq(zdev); 464 if (rc) 465 return; 466 467 /* Release MSI interrupts */ 468 list_for_each_entry(msi, &pdev->msi_list, list) { 469 if (msi->msi_attrib.is_msix) 470 __pci_msix_desc_mask_irq(msi, 1); 471 else 472 __pci_msi_desc_mask_irq(msi, 1, 1); 473 irq_set_msi_desc(msi->irq, NULL); 474 irq_free_desc(msi->irq); 475 msi->msg.address_lo = 0; 476 msi->msg.address_hi = 0; 477 msi->msg.data = 0; 478 msi->irq = 0; 479 } 480 481 zpci_aibv[zdev->aisb] = NULL; 482 airq_iv_release(zdev->aibv); 483 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb); 484 } 485 486 static void zpci_map_resources(struct zpci_dev *zdev) 487 { 488 struct pci_dev *pdev = zdev->pdev; 489 resource_size_t len; 490 int i; 491 492 for (i = 0; i < PCI_BAR_COUNT; i++) { 493 len = pci_resource_len(pdev, i); 494 if (!len) 495 continue; 496 pdev->resource[i].start = 497 (resource_size_t __force) pci_iomap(pdev, i, 0); 498 pdev->resource[i].end = pdev->resource[i].start + len - 1; 499 } 500 } 501 502 static void zpci_unmap_resources(struct zpci_dev *zdev) 503 { 504 struct pci_dev *pdev = zdev->pdev; 505 resource_size_t len; 506 int i; 507 508 for (i = 0; i < PCI_BAR_COUNT; i++) { 509 len = pci_resource_len(pdev, i); 510 if (!len) 511 continue; 512 pci_iounmap(pdev, (void __iomem __force *) 513 pdev->resource[i].start); 514 } 515 } 516 517 static int __init zpci_irq_init(void) 518 { 519 int rc; 520 521 rc = register_adapter_interrupt(&zpci_airq); 522 if (rc) 523 goto out; 524 /* Set summary to 1 to be called every time for the ISC. */ 525 *zpci_airq.lsi_ptr = 1; 526 527 rc = -ENOMEM; 528 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC); 529 if (!zpci_aisb_iv) 530 goto out_airq; 531 532 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); 533 return 0; 534 535 out_airq: 536 unregister_adapter_interrupt(&zpci_airq); 537 out: 538 return rc; 539 } 540 541 static void zpci_irq_exit(void) 542 { 543 airq_iv_release(zpci_aisb_iv); 544 unregister_adapter_interrupt(&zpci_airq); 545 } 546 547 static int zpci_alloc_iomap(struct zpci_dev *zdev) 548 { 549 int entry; 550 551 spin_lock(&zpci_iomap_lock); 552 entry = find_first_zero_bit(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES); 553 if (entry == ZPCI_IOMAP_MAX_ENTRIES) { 554 spin_unlock(&zpci_iomap_lock); 555 return -ENOSPC; 556 } 557 set_bit(entry, zpci_iomap); 558 spin_unlock(&zpci_iomap_lock); 559 return entry; 560 } 561 562 static void zpci_free_iomap(struct zpci_dev *zdev, int entry) 563 { 564 spin_lock(&zpci_iomap_lock); 565 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry)); 566 clear_bit(entry, zpci_iomap); 567 spin_unlock(&zpci_iomap_lock); 568 } 569 570 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start, 571 unsigned long size, unsigned long flags) 572 { 573 struct resource *r; 574 575 r = kzalloc(sizeof(*r), GFP_KERNEL); 576 if (!r) 577 return NULL; 578 579 r->start = start; 580 r->end = r->start + size - 1; 581 r->flags = flags; 582 r->name = zdev->res_name; 583 584 if (request_resource(&iomem_resource, r)) { 585 kfree(r); 586 return NULL; 587 } 588 return r; 589 } 590 591 static int zpci_setup_bus_resources(struct zpci_dev *zdev, 592 struct list_head *resources) 593 { 594 unsigned long addr, size, flags; 595 struct resource *res; 596 int i, entry; 597 598 snprintf(zdev->res_name, sizeof(zdev->res_name), 599 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR); 600 601 for (i = 0; i < PCI_BAR_COUNT; i++) { 602 if (!zdev->bars[i].size) 603 continue; 604 entry = zpci_alloc_iomap(zdev); 605 if (entry < 0) 606 return entry; 607 zdev->bars[i].map_idx = entry; 608 609 /* only MMIO is supported */ 610 flags = IORESOURCE_MEM; 611 if (zdev->bars[i].val & 8) 612 flags |= IORESOURCE_PREFETCH; 613 if (zdev->bars[i].val & 4) 614 flags |= IORESOURCE_MEM_64; 615 616 addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48); 617 618 size = 1UL << zdev->bars[i].size; 619 620 res = __alloc_res(zdev, addr, size, flags); 621 if (!res) { 622 zpci_free_iomap(zdev, entry); 623 return -ENOMEM; 624 } 625 zdev->bars[i].res = res; 626 pci_add_resource(resources, res); 627 } 628 629 return 0; 630 } 631 632 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev) 633 { 634 int i; 635 636 for (i = 0; i < PCI_BAR_COUNT; i++) { 637 if (!zdev->bars[i].size) 638 continue; 639 640 zpci_free_iomap(zdev, zdev->bars[i].map_idx); 641 release_resource(zdev->bars[i].res); 642 kfree(zdev->bars[i].res); 643 } 644 } 645 646 int pcibios_add_device(struct pci_dev *pdev) 647 { 648 struct zpci_dev *zdev = get_zdev(pdev); 649 struct resource *res; 650 int i; 651 652 zdev->pdev = pdev; 653 pdev->dev.groups = zpci_attr_groups; 654 zpci_map_resources(zdev); 655 656 for (i = 0; i < PCI_BAR_COUNT; i++) { 657 res = &pdev->resource[i]; 658 if (res->parent || !res->flags) 659 continue; 660 pci_claim_resource(pdev, i); 661 } 662 663 return 0; 664 } 665 666 int pcibios_enable_device(struct pci_dev *pdev, int mask) 667 { 668 struct zpci_dev *zdev = get_zdev(pdev); 669 670 zdev->pdev = pdev; 671 zpci_debug_init_device(zdev); 672 zpci_fmb_enable_device(zdev); 673 zpci_map_resources(zdev); 674 675 return pci_enable_resources(pdev, mask); 676 } 677 678 void pcibios_disable_device(struct pci_dev *pdev) 679 { 680 struct zpci_dev *zdev = get_zdev(pdev); 681 682 zpci_unmap_resources(zdev); 683 zpci_fmb_disable_device(zdev); 684 zpci_debug_exit_device(zdev); 685 zdev->pdev = NULL; 686 } 687 688 #ifdef CONFIG_HIBERNATE_CALLBACKS 689 static int zpci_restore(struct device *dev) 690 { 691 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev)); 692 int ret = 0; 693 694 if (zdev->state != ZPCI_FN_STATE_ONLINE) 695 goto out; 696 697 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 698 if (ret) 699 goto out; 700 701 zpci_map_resources(zdev); 702 zpci_register_ioat(zdev, 0, zdev->start_dma + PAGE_OFFSET, 703 zdev->start_dma + zdev->iommu_size - 1, 704 (u64) zdev->dma_table); 705 706 out: 707 return ret; 708 } 709 710 static int zpci_freeze(struct device *dev) 711 { 712 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev)); 713 714 if (zdev->state != ZPCI_FN_STATE_ONLINE) 715 return 0; 716 717 zpci_unregister_ioat(zdev, 0); 718 return clp_disable_fh(zdev); 719 } 720 721 struct dev_pm_ops pcibios_pm_ops = { 722 .thaw_noirq = zpci_restore, 723 .freeze_noirq = zpci_freeze, 724 .restore_noirq = zpci_restore, 725 .poweroff_noirq = zpci_freeze, 726 }; 727 #endif /* CONFIG_HIBERNATE_CALLBACKS */ 728 729 static int zpci_alloc_domain(struct zpci_dev *zdev) 730 { 731 spin_lock(&zpci_domain_lock); 732 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES); 733 if (zdev->domain == ZPCI_NR_DEVICES) { 734 spin_unlock(&zpci_domain_lock); 735 return -ENOSPC; 736 } 737 set_bit(zdev->domain, zpci_domain); 738 spin_unlock(&zpci_domain_lock); 739 return 0; 740 } 741 742 static void zpci_free_domain(struct zpci_dev *zdev) 743 { 744 spin_lock(&zpci_domain_lock); 745 clear_bit(zdev->domain, zpci_domain); 746 spin_unlock(&zpci_domain_lock); 747 } 748 749 void pcibios_remove_bus(struct pci_bus *bus) 750 { 751 struct zpci_dev *zdev = get_zdev_by_bus(bus); 752 753 zpci_exit_slot(zdev); 754 zpci_cleanup_bus_resources(zdev); 755 zpci_free_domain(zdev); 756 757 spin_lock(&zpci_list_lock); 758 list_del(&zdev->entry); 759 spin_unlock(&zpci_list_lock); 760 761 kfree(zdev); 762 } 763 764 static int zpci_scan_bus(struct zpci_dev *zdev) 765 { 766 LIST_HEAD(resources); 767 int ret; 768 769 ret = zpci_setup_bus_resources(zdev, &resources); 770 if (ret) 771 return ret; 772 773 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops, 774 zdev, &resources); 775 if (!zdev->bus) { 776 zpci_cleanup_bus_resources(zdev); 777 return -EIO; 778 } 779 780 zdev->bus->max_bus_speed = zdev->max_bus_speed; 781 return 0; 782 } 783 784 int zpci_enable_device(struct zpci_dev *zdev) 785 { 786 int rc; 787 788 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 789 if (rc) 790 goto out; 791 792 rc = zpci_dma_init_device(zdev); 793 if (rc) 794 goto out_dma; 795 796 zdev->state = ZPCI_FN_STATE_ONLINE; 797 return 0; 798 799 out_dma: 800 clp_disable_fh(zdev); 801 out: 802 return rc; 803 } 804 EXPORT_SYMBOL_GPL(zpci_enable_device); 805 806 int zpci_disable_device(struct zpci_dev *zdev) 807 { 808 zpci_dma_exit_device(zdev); 809 return clp_disable_fh(zdev); 810 } 811 EXPORT_SYMBOL_GPL(zpci_disable_device); 812 813 int zpci_create_device(struct zpci_dev *zdev) 814 { 815 int rc; 816 817 rc = zpci_alloc_domain(zdev); 818 if (rc) 819 goto out; 820 821 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 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb), 865 16, 0, NULL); 866 if (!zdev_fmb_cache) 867 goto error_zdev; 868 869 /* TODO: use realloc */ 870 zpci_iomap_start = kzalloc(ZPCI_IOMAP_MAX_ENTRIES * sizeof(*zpci_iomap_start), 871 GFP_KERNEL); 872 if (!zpci_iomap_start) 873 goto error_iomap; 874 return 0; 875 876 error_iomap: 877 kmem_cache_destroy(zdev_fmb_cache); 878 error_zdev: 879 return -ENOMEM; 880 } 881 882 static void zpci_mem_exit(void) 883 { 884 kfree(zpci_iomap_start); 885 kmem_cache_destroy(zdev_fmb_cache); 886 } 887 888 static unsigned int s390_pci_probe = 1; 889 static unsigned int s390_pci_initialized; 890 891 char * __init pcibios_setup(char *str) 892 { 893 if (!strcmp(str, "off")) { 894 s390_pci_probe = 0; 895 return NULL; 896 } 897 return str; 898 } 899 900 bool zpci_is_enabled(void) 901 { 902 return s390_pci_initialized; 903 } 904 905 static int __init pci_base_init(void) 906 { 907 int rc; 908 909 if (!s390_pci_probe) 910 return 0; 911 912 if (!test_facility(2) || !test_facility(69) 913 || !test_facility(71) || !test_facility(72)) 914 return 0; 915 916 rc = zpci_debug_init(); 917 if (rc) 918 goto out; 919 920 rc = zpci_mem_init(); 921 if (rc) 922 goto out_mem; 923 924 rc = zpci_irq_init(); 925 if (rc) 926 goto out_irq; 927 928 rc = zpci_dma_init(); 929 if (rc) 930 goto out_dma; 931 932 rc = clp_scan_pci_devices(); 933 if (rc) 934 goto out_find; 935 936 s390_pci_initialized = 1; 937 return 0; 938 939 out_find: 940 zpci_dma_exit(); 941 out_dma: 942 zpci_irq_exit(); 943 out_irq: 944 zpci_mem_exit(); 945 out_mem: 946 zpci_debug_exit(); 947 out: 948 return rc; 949 } 950 subsys_initcall_sync(pci_base_init); 951 952 void zpci_rescan(void) 953 { 954 if (zpci_is_enabled()) 955 clp_rescan_pci_devices_simple(); 956 } 957