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 COMPONENT "zPCI" 19 #define pr_fmt(fmt) 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 void zpci_enable_irq(struct irq_data *data); 52 static void zpci_disable_irq(struct irq_data *data); 53 54 static struct irq_chip zpci_irq_chip = { 55 .name = "zPCI", 56 .irq_unmask = zpci_enable_irq, 57 .irq_mask = zpci_disable_irq, 58 }; 59 60 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES); 61 static DEFINE_SPINLOCK(zpci_domain_lock); 62 63 static struct airq_iv *zpci_aisb_iv; 64 static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES]; 65 66 /* Adapter interrupt definitions */ 67 static void zpci_irq_handler(struct airq_struct *airq); 68 69 static struct airq_struct zpci_airq = { 70 .handler = zpci_irq_handler, 71 .isc = PCI_ISC, 72 }; 73 74 /* I/O Map */ 75 static DEFINE_SPINLOCK(zpci_iomap_lock); 76 static DECLARE_BITMAP(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES); 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(struct pci_dev *pdev) 83 { 84 return (struct zpci_dev *) pdev->sysdata; 85 } 86 87 struct zpci_dev *get_zdev_by_fid(u32 fid) 88 { 89 struct zpci_dev *tmp, *zdev = NULL; 90 91 spin_lock(&zpci_list_lock); 92 list_for_each_entry(tmp, &zpci_list, entry) { 93 if (tmp->fid == fid) { 94 zdev = tmp; 95 break; 96 } 97 } 98 spin_unlock(&zpci_list_lock); 99 return zdev; 100 } 101 102 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus) 103 { 104 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL; 105 } 106 107 int pci_domain_nr(struct pci_bus *bus) 108 { 109 return ((struct zpci_dev *) bus->sysdata)->domain; 110 } 111 EXPORT_SYMBOL_GPL(pci_domain_nr); 112 113 int pci_proc_domain(struct pci_bus *bus) 114 { 115 return pci_domain_nr(bus); 116 } 117 EXPORT_SYMBOL_GPL(pci_proc_domain); 118 119 /* Modify PCI: Register adapter interruptions */ 120 static int zpci_set_airq(struct zpci_dev *zdev) 121 { 122 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT); 123 struct zpci_fib fib = {0}; 124 125 fib.isc = PCI_ISC; 126 fib.sum = 1; /* enable summary notifications */ 127 fib.noi = airq_iv_end(zdev->aibv); 128 fib.aibv = (unsigned long) zdev->aibv->vector; 129 fib.aibvo = 0; /* each zdev has its own interrupt vector */ 130 fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8; 131 fib.aisbo = zdev->aisb & 63; 132 133 return zpci_mod_fc(req, &fib); 134 } 135 136 struct mod_pci_args { 137 u64 base; 138 u64 limit; 139 u64 iota; 140 u64 fmb_addr; 141 }; 142 143 static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args) 144 { 145 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn); 146 struct zpci_fib fib = {0}; 147 148 fib.pba = args->base; 149 fib.pal = args->limit; 150 fib.iota = args->iota; 151 fib.fmb_addr = args->fmb_addr; 152 153 return zpci_mod_fc(req, &fib); 154 } 155 156 /* Modify PCI: Register I/O address translation parameters */ 157 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas, 158 u64 base, u64 limit, u64 iota) 159 { 160 struct mod_pci_args args = { base, limit, iota, 0 }; 161 162 WARN_ON_ONCE(iota & 0x3fff); 163 args.iota |= ZPCI_IOTA_RTTO_FLAG; 164 return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args); 165 } 166 167 /* Modify PCI: Unregister I/O address translation parameters */ 168 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas) 169 { 170 struct mod_pci_args args = { 0, 0, 0, 0 }; 171 172 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args); 173 } 174 175 /* Modify PCI: Unregister adapter interruptions */ 176 static int zpci_clear_airq(struct zpci_dev *zdev) 177 { 178 struct mod_pci_args args = { 0, 0, 0, 0 }; 179 180 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args); 181 } 182 183 /* Modify PCI: Set PCI function measurement parameters */ 184 int zpci_fmb_enable_device(struct zpci_dev *zdev) 185 { 186 struct mod_pci_args args = { 0, 0, 0, 0 }; 187 188 if (zdev->fmb) 189 return -EINVAL; 190 191 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL); 192 if (!zdev->fmb) 193 return -ENOMEM; 194 WARN_ON((u64) zdev->fmb & 0xf); 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 static int zpci_msi_set_mask_bits(struct msi_desc *msi, u32 mask, u32 flag) 248 { 249 int offset, pos; 250 u32 mask_bits; 251 252 if (msi->msi_attrib.is_msix) { 253 offset = msi->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE + 254 PCI_MSIX_ENTRY_VECTOR_CTRL; 255 msi->masked = readl(msi->mask_base + offset); 256 writel(flag, msi->mask_base + offset); 257 } else if (msi->msi_attrib.maskbit) { 258 pos = (long) msi->mask_base; 259 pci_read_config_dword(msi->dev, pos, &mask_bits); 260 mask_bits &= ~(mask); 261 mask_bits |= flag & mask; 262 pci_write_config_dword(msi->dev, pos, mask_bits); 263 } else 264 return 0; 265 266 msi->msi_attrib.maskbit = !!flag; 267 return 1; 268 } 269 270 static void zpci_enable_irq(struct irq_data *data) 271 { 272 struct msi_desc *msi = irq_get_msi_desc(data->irq); 273 274 zpci_msi_set_mask_bits(msi, 1, 0); 275 } 276 277 static void zpci_disable_irq(struct irq_data *data) 278 { 279 struct msi_desc *msi = irq_get_msi_desc(data->irq); 280 281 zpci_msi_set_mask_bits(msi, 1, 1); 282 } 283 284 void pcibios_fixup_bus(struct pci_bus *bus) 285 { 286 } 287 288 resource_size_t pcibios_align_resource(void *data, const struct resource *res, 289 resource_size_t size, 290 resource_size_t align) 291 { 292 return 0; 293 } 294 295 /* combine single writes by using store-block insn */ 296 void __iowrite64_copy(void __iomem *to, const void *from, size_t count) 297 { 298 zpci_memcpy_toio(to, from, count); 299 } 300 301 /* Create a virtual mapping cookie for a PCI BAR */ 302 void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max) 303 { 304 struct zpci_dev *zdev = get_zdev(pdev); 305 u64 addr; 306 int idx; 307 308 if ((bar & 7) != bar) 309 return NULL; 310 311 idx = zdev->bars[bar].map_idx; 312 spin_lock(&zpci_iomap_lock); 313 zpci_iomap_start[idx].fh = zdev->fh; 314 zpci_iomap_start[idx].bar = bar; 315 spin_unlock(&zpci_iomap_lock); 316 317 addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48); 318 return (void __iomem *) addr; 319 } 320 EXPORT_SYMBOL_GPL(pci_iomap); 321 322 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr) 323 { 324 unsigned int idx; 325 326 idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48; 327 spin_lock(&zpci_iomap_lock); 328 zpci_iomap_start[idx].fh = 0; 329 zpci_iomap_start[idx].bar = 0; 330 spin_unlock(&zpci_iomap_lock); 331 } 332 EXPORT_SYMBOL_GPL(pci_iounmap); 333 334 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, 335 int size, u32 *val) 336 { 337 struct zpci_dev *zdev = get_zdev_by_bus(bus); 338 int ret; 339 340 if (!zdev || devfn != ZPCI_DEVFN) 341 ret = -ENODEV; 342 else 343 ret = zpci_cfg_load(zdev, where, val, size); 344 345 return ret; 346 } 347 348 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, 349 int size, u32 val) 350 { 351 struct zpci_dev *zdev = get_zdev_by_bus(bus); 352 int ret; 353 354 if (!zdev || devfn != ZPCI_DEVFN) 355 ret = -ENODEV; 356 else 357 ret = zpci_cfg_store(zdev, where, val, size); 358 359 return ret; 360 } 361 362 static struct pci_ops pci_root_ops = { 363 .read = pci_read, 364 .write = pci_write, 365 }; 366 367 static void zpci_irq_handler(struct airq_struct *airq) 368 { 369 unsigned long si, ai; 370 struct airq_iv *aibv; 371 int irqs_on = 0; 372 373 inc_irq_stat(IRQIO_PCI); 374 for (si = 0;;) { 375 /* Scan adapter summary indicator bit vector */ 376 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv)); 377 if (si == -1UL) { 378 if (irqs_on++) 379 /* End of second scan with interrupts on. */ 380 break; 381 /* First scan complete, reenable interrupts. */ 382 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); 383 si = 0; 384 continue; 385 } 386 387 /* Scan the adapter interrupt vector for this device. */ 388 aibv = zpci_aibv[si]; 389 for (ai = 0;;) { 390 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv)); 391 if (ai == -1UL) 392 break; 393 inc_irq_stat(IRQIO_MSI); 394 airq_iv_lock(aibv, ai); 395 generic_handle_irq(airq_iv_get_data(aibv, ai)); 396 airq_iv_unlock(aibv, ai); 397 } 398 } 399 } 400 401 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) 402 { 403 struct zpci_dev *zdev = get_zdev(pdev); 404 unsigned int hwirq, msi_vecs; 405 unsigned long aisb; 406 struct msi_desc *msi; 407 struct msi_msg msg; 408 int rc, irq; 409 410 if (type == PCI_CAP_ID_MSI && nvec > 1) 411 return 1; 412 msi_vecs = min(nvec, ZPCI_MSI_VEC_MAX); 413 msi_vecs = min_t(unsigned int, msi_vecs, CONFIG_PCI_NR_MSI); 414 415 /* Allocate adapter summary indicator bit */ 416 rc = -EIO; 417 aisb = airq_iv_alloc_bit(zpci_aisb_iv); 418 if (aisb == -1UL) 419 goto out; 420 zdev->aisb = aisb; 421 422 /* Create adapter interrupt vector */ 423 rc = -ENOMEM; 424 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK); 425 if (!zdev->aibv) 426 goto out_si; 427 428 /* Wire up shortcut pointer */ 429 zpci_aibv[aisb] = zdev->aibv; 430 431 /* Request MSI interrupts */ 432 hwirq = 0; 433 list_for_each_entry(msi, &pdev->msi_list, list) { 434 rc = -EIO; 435 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */ 436 if (irq < 0) 437 goto out_msi; 438 rc = irq_set_msi_desc(irq, msi); 439 if (rc) 440 goto out_msi; 441 irq_set_chip_and_handler(irq, &zpci_irq_chip, 442 handle_simple_irq); 443 msg.data = hwirq; 444 msg.address_lo = zdev->msi_addr & 0xffffffff; 445 msg.address_hi = zdev->msi_addr >> 32; 446 write_msi_msg(irq, &msg); 447 airq_iv_set_data(zdev->aibv, hwirq, irq); 448 hwirq++; 449 } 450 451 /* Enable adapter interrupts */ 452 rc = zpci_set_airq(zdev); 453 if (rc) 454 goto out_msi; 455 456 return (msi_vecs == nvec) ? 0 : msi_vecs; 457 458 out_msi: 459 list_for_each_entry(msi, &pdev->msi_list, list) { 460 if (hwirq-- == 0) 461 break; 462 irq_set_msi_desc(msi->irq, NULL); 463 irq_free_desc(msi->irq); 464 msi->msg.address_lo = 0; 465 msi->msg.address_hi = 0; 466 msi->msg.data = 0; 467 msi->irq = 0; 468 } 469 zpci_aibv[aisb] = NULL; 470 airq_iv_release(zdev->aibv); 471 out_si: 472 airq_iv_free_bit(zpci_aisb_iv, aisb); 473 out: 474 return rc; 475 } 476 477 void arch_teardown_msi_irqs(struct pci_dev *pdev) 478 { 479 struct zpci_dev *zdev = get_zdev(pdev); 480 struct msi_desc *msi; 481 int rc; 482 483 /* Disable adapter interrupts */ 484 rc = zpci_clear_airq(zdev); 485 if (rc) 486 return; 487 488 /* Release MSI interrupts */ 489 list_for_each_entry(msi, &pdev->msi_list, list) { 490 zpci_msi_set_mask_bits(msi, 1, 1); 491 irq_set_msi_desc(msi->irq, NULL); 492 irq_free_desc(msi->irq); 493 msi->msg.address_lo = 0; 494 msi->msg.address_hi = 0; 495 msi->msg.data = 0; 496 msi->irq = 0; 497 } 498 499 zpci_aibv[zdev->aisb] = NULL; 500 airq_iv_release(zdev->aibv); 501 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb); 502 } 503 504 static void zpci_map_resources(struct zpci_dev *zdev) 505 { 506 struct pci_dev *pdev = zdev->pdev; 507 resource_size_t len; 508 int i; 509 510 for (i = 0; i < PCI_BAR_COUNT; i++) { 511 len = pci_resource_len(pdev, i); 512 if (!len) 513 continue; 514 pdev->resource[i].start = (resource_size_t) pci_iomap(pdev, i, 0); 515 pdev->resource[i].end = pdev->resource[i].start + len - 1; 516 } 517 } 518 519 static void zpci_unmap_resources(struct zpci_dev *zdev) 520 { 521 struct pci_dev *pdev = zdev->pdev; 522 resource_size_t len; 523 int i; 524 525 for (i = 0; i < PCI_BAR_COUNT; i++) { 526 len = pci_resource_len(pdev, i); 527 if (!len) 528 continue; 529 pci_iounmap(pdev, (void *) pdev->resource[i].start); 530 } 531 } 532 533 static int __init zpci_irq_init(void) 534 { 535 int rc; 536 537 rc = register_adapter_interrupt(&zpci_airq); 538 if (rc) 539 goto out; 540 /* Set summary to 1 to be called every time for the ISC. */ 541 *zpci_airq.lsi_ptr = 1; 542 543 rc = -ENOMEM; 544 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC); 545 if (!zpci_aisb_iv) 546 goto out_airq; 547 548 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); 549 return 0; 550 551 out_airq: 552 unregister_adapter_interrupt(&zpci_airq); 553 out: 554 return rc; 555 } 556 557 static void zpci_irq_exit(void) 558 { 559 airq_iv_release(zpci_aisb_iv); 560 unregister_adapter_interrupt(&zpci_airq); 561 } 562 563 static int zpci_alloc_iomap(struct zpci_dev *zdev) 564 { 565 int entry; 566 567 spin_lock(&zpci_iomap_lock); 568 entry = find_first_zero_bit(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES); 569 if (entry == ZPCI_IOMAP_MAX_ENTRIES) { 570 spin_unlock(&zpci_iomap_lock); 571 return -ENOSPC; 572 } 573 set_bit(entry, zpci_iomap); 574 spin_unlock(&zpci_iomap_lock); 575 return entry; 576 } 577 578 static void zpci_free_iomap(struct zpci_dev *zdev, int entry) 579 { 580 spin_lock(&zpci_iomap_lock); 581 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry)); 582 clear_bit(entry, zpci_iomap); 583 spin_unlock(&zpci_iomap_lock); 584 } 585 586 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start, 587 unsigned long size, unsigned long flags) 588 { 589 struct resource *r; 590 591 r = kzalloc(sizeof(*r), GFP_KERNEL); 592 if (!r) 593 return NULL; 594 595 r->start = start; 596 r->end = r->start + size - 1; 597 r->flags = flags; 598 r->name = zdev->res_name; 599 600 if (request_resource(&iomem_resource, r)) { 601 kfree(r); 602 return NULL; 603 } 604 return r; 605 } 606 607 static int zpci_setup_bus_resources(struct zpci_dev *zdev, 608 struct list_head *resources) 609 { 610 unsigned long addr, size, flags; 611 struct resource *res; 612 int i, entry; 613 614 snprintf(zdev->res_name, sizeof(zdev->res_name), 615 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR); 616 617 for (i = 0; i < PCI_BAR_COUNT; i++) { 618 if (!zdev->bars[i].size) 619 continue; 620 entry = zpci_alloc_iomap(zdev); 621 if (entry < 0) 622 return entry; 623 zdev->bars[i].map_idx = entry; 624 625 /* only MMIO is supported */ 626 flags = IORESOURCE_MEM; 627 if (zdev->bars[i].val & 8) 628 flags |= IORESOURCE_PREFETCH; 629 if (zdev->bars[i].val & 4) 630 flags |= IORESOURCE_MEM_64; 631 632 addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48); 633 634 size = 1UL << zdev->bars[i].size; 635 636 res = __alloc_res(zdev, addr, size, flags); 637 if (!res) { 638 zpci_free_iomap(zdev, entry); 639 return -ENOMEM; 640 } 641 zdev->bars[i].res = res; 642 pci_add_resource(resources, res); 643 } 644 645 return 0; 646 } 647 648 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev) 649 { 650 int i; 651 652 for (i = 0; i < PCI_BAR_COUNT; i++) { 653 if (!zdev->bars[i].size) 654 continue; 655 656 zpci_free_iomap(zdev, zdev->bars[i].map_idx); 657 release_resource(zdev->bars[i].res); 658 kfree(zdev->bars[i].res); 659 } 660 } 661 662 int pcibios_add_device(struct pci_dev *pdev) 663 { 664 struct zpci_dev *zdev = get_zdev(pdev); 665 struct resource *res; 666 int i; 667 668 zdev->pdev = pdev; 669 pdev->dev.groups = zpci_attr_groups; 670 zpci_map_resources(zdev); 671 672 for (i = 0; i < PCI_BAR_COUNT; i++) { 673 res = &pdev->resource[i]; 674 if (res->parent || !res->flags) 675 continue; 676 pci_claim_resource(pdev, i); 677 } 678 679 return 0; 680 } 681 682 int pcibios_enable_device(struct pci_dev *pdev, int mask) 683 { 684 struct zpci_dev *zdev = get_zdev(pdev); 685 686 zdev->pdev = pdev; 687 zpci_debug_init_device(zdev); 688 zpci_fmb_enable_device(zdev); 689 zpci_map_resources(zdev); 690 691 return pci_enable_resources(pdev, mask); 692 } 693 694 void pcibios_disable_device(struct pci_dev *pdev) 695 { 696 struct zpci_dev *zdev = get_zdev(pdev); 697 698 zpci_unmap_resources(zdev); 699 zpci_fmb_disable_device(zdev); 700 zpci_debug_exit_device(zdev); 701 zdev->pdev = NULL; 702 } 703 704 #ifdef CONFIG_HIBERNATE_CALLBACKS 705 static int zpci_restore(struct device *dev) 706 { 707 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev)); 708 int ret = 0; 709 710 if (zdev->state != ZPCI_FN_STATE_ONLINE) 711 goto out; 712 713 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 714 if (ret) 715 goto out; 716 717 zpci_map_resources(zdev); 718 zpci_register_ioat(zdev, 0, zdev->start_dma + PAGE_OFFSET, 719 zdev->start_dma + zdev->iommu_size - 1, 720 (u64) zdev->dma_table); 721 722 out: 723 return ret; 724 } 725 726 static int zpci_freeze(struct device *dev) 727 { 728 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev)); 729 730 if (zdev->state != ZPCI_FN_STATE_ONLINE) 731 return 0; 732 733 zpci_unregister_ioat(zdev, 0); 734 return clp_disable_fh(zdev); 735 } 736 737 struct dev_pm_ops pcibios_pm_ops = { 738 .thaw_noirq = zpci_restore, 739 .freeze_noirq = zpci_freeze, 740 .restore_noirq = zpci_restore, 741 .poweroff_noirq = zpci_freeze, 742 }; 743 #endif /* CONFIG_HIBERNATE_CALLBACKS */ 744 745 static int zpci_alloc_domain(struct zpci_dev *zdev) 746 { 747 spin_lock(&zpci_domain_lock); 748 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES); 749 if (zdev->domain == ZPCI_NR_DEVICES) { 750 spin_unlock(&zpci_domain_lock); 751 return -ENOSPC; 752 } 753 set_bit(zdev->domain, zpci_domain); 754 spin_unlock(&zpci_domain_lock); 755 return 0; 756 } 757 758 static void zpci_free_domain(struct zpci_dev *zdev) 759 { 760 spin_lock(&zpci_domain_lock); 761 clear_bit(zdev->domain, zpci_domain); 762 spin_unlock(&zpci_domain_lock); 763 } 764 765 void pcibios_remove_bus(struct pci_bus *bus) 766 { 767 struct zpci_dev *zdev = get_zdev_by_bus(bus); 768 769 zpci_exit_slot(zdev); 770 zpci_cleanup_bus_resources(zdev); 771 zpci_free_domain(zdev); 772 773 spin_lock(&zpci_list_lock); 774 list_del(&zdev->entry); 775 spin_unlock(&zpci_list_lock); 776 777 kfree(zdev); 778 } 779 780 static int zpci_scan_bus(struct zpci_dev *zdev) 781 { 782 LIST_HEAD(resources); 783 int ret; 784 785 ret = zpci_setup_bus_resources(zdev, &resources); 786 if (ret) 787 return ret; 788 789 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops, 790 zdev, &resources); 791 if (!zdev->bus) { 792 zpci_cleanup_bus_resources(zdev); 793 return -EIO; 794 } 795 796 zdev->bus->max_bus_speed = zdev->max_bus_speed; 797 return 0; 798 } 799 800 int zpci_enable_device(struct zpci_dev *zdev) 801 { 802 int rc; 803 804 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 805 if (rc) 806 goto out; 807 808 rc = zpci_dma_init_device(zdev); 809 if (rc) 810 goto out_dma; 811 812 zdev->state = ZPCI_FN_STATE_ONLINE; 813 return 0; 814 815 out_dma: 816 clp_disable_fh(zdev); 817 out: 818 return rc; 819 } 820 EXPORT_SYMBOL_GPL(zpci_enable_device); 821 822 int zpci_disable_device(struct zpci_dev *zdev) 823 { 824 zpci_dma_exit_device(zdev); 825 return clp_disable_fh(zdev); 826 } 827 EXPORT_SYMBOL_GPL(zpci_disable_device); 828 829 int zpci_create_device(struct zpci_dev *zdev) 830 { 831 int rc; 832 833 rc = zpci_alloc_domain(zdev); 834 if (rc) 835 goto out; 836 837 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) { 838 rc = zpci_enable_device(zdev); 839 if (rc) 840 goto out_free; 841 } 842 rc = zpci_scan_bus(zdev); 843 if (rc) 844 goto out_disable; 845 846 spin_lock(&zpci_list_lock); 847 list_add_tail(&zdev->entry, &zpci_list); 848 spin_unlock(&zpci_list_lock); 849 850 zpci_init_slot(zdev); 851 852 return 0; 853 854 out_disable: 855 if (zdev->state == ZPCI_FN_STATE_ONLINE) 856 zpci_disable_device(zdev); 857 out_free: 858 zpci_free_domain(zdev); 859 out: 860 return rc; 861 } 862 863 void zpci_stop_device(struct zpci_dev *zdev) 864 { 865 zpci_dma_exit_device(zdev); 866 /* 867 * Note: SCLP disables fh via set-pci-fn so don't 868 * do that here. 869 */ 870 } 871 EXPORT_SYMBOL_GPL(zpci_stop_device); 872 873 static inline int barsize(u8 size) 874 { 875 return (size) ? (1 << size) >> 10 : 0; 876 } 877 878 static int zpci_mem_init(void) 879 { 880 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb), 881 16, 0, NULL); 882 if (!zdev_fmb_cache) 883 goto error_zdev; 884 885 /* TODO: use realloc */ 886 zpci_iomap_start = kzalloc(ZPCI_IOMAP_MAX_ENTRIES * sizeof(*zpci_iomap_start), 887 GFP_KERNEL); 888 if (!zpci_iomap_start) 889 goto error_iomap; 890 return 0; 891 892 error_iomap: 893 kmem_cache_destroy(zdev_fmb_cache); 894 error_zdev: 895 return -ENOMEM; 896 } 897 898 static void zpci_mem_exit(void) 899 { 900 kfree(zpci_iomap_start); 901 kmem_cache_destroy(zdev_fmb_cache); 902 } 903 904 static unsigned int s390_pci_probe = 1; 905 static unsigned int s390_pci_initialized; 906 907 char * __init pcibios_setup(char *str) 908 { 909 if (!strcmp(str, "off")) { 910 s390_pci_probe = 0; 911 return NULL; 912 } 913 return str; 914 } 915 916 bool zpci_is_enabled(void) 917 { 918 return s390_pci_initialized; 919 } 920 921 static int __init pci_base_init(void) 922 { 923 int rc; 924 925 if (!s390_pci_probe) 926 return 0; 927 928 if (!test_facility(2) || !test_facility(69) 929 || !test_facility(71) || !test_facility(72)) 930 return 0; 931 932 rc = zpci_debug_init(); 933 if (rc) 934 goto out; 935 936 rc = zpci_mem_init(); 937 if (rc) 938 goto out_mem; 939 940 rc = zpci_irq_init(); 941 if (rc) 942 goto out_irq; 943 944 rc = zpci_dma_init(); 945 if (rc) 946 goto out_dma; 947 948 rc = clp_scan_pci_devices(); 949 if (rc) 950 goto out_find; 951 952 s390_pci_initialized = 1; 953 return 0; 954 955 out_find: 956 zpci_dma_exit(); 957 out_dma: 958 zpci_irq_exit(); 959 out_irq: 960 zpci_mem_exit(); 961 out_mem: 962 zpci_debug_exit(); 963 out: 964 return rc; 965 } 966 subsys_initcall_sync(pci_base_init); 967 968 void zpci_rescan(void) 969 { 970 if (zpci_is_enabled()) 971 clp_rescan_pci_devices_simple(); 972 } 973