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 #define ZPCI_IOMAP_ENTRIES \ 64 min(((unsigned long) ZPCI_NR_DEVICES * PCI_BAR_COUNT / 2), \ 65 ZPCI_IOMAP_MAX_ENTRIES) 66 67 static DEFINE_SPINLOCK(zpci_iomap_lock); 68 static unsigned long *zpci_iomap_bitmap; 69 struct zpci_iomap_entry *zpci_iomap_start; 70 EXPORT_SYMBOL_GPL(zpci_iomap_start); 71 72 static struct kmem_cache *zdev_fmb_cache; 73 74 struct zpci_dev *get_zdev_by_fid(u32 fid) 75 { 76 struct zpci_dev *tmp, *zdev = NULL; 77 78 spin_lock(&zpci_list_lock); 79 list_for_each_entry(tmp, &zpci_list, entry) { 80 if (tmp->fid == fid) { 81 zdev = tmp; 82 break; 83 } 84 } 85 spin_unlock(&zpci_list_lock); 86 return zdev; 87 } 88 89 void zpci_remove_reserved_devices(void) 90 { 91 struct zpci_dev *tmp, *zdev; 92 enum zpci_state state; 93 LIST_HEAD(remove); 94 95 spin_lock(&zpci_list_lock); 96 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) { 97 if (zdev->state == ZPCI_FN_STATE_STANDBY && 98 !clp_get_state(zdev->fid, &state) && 99 state == ZPCI_FN_STATE_RESERVED) 100 list_move_tail(&zdev->entry, &remove); 101 } 102 spin_unlock(&zpci_list_lock); 103 104 list_for_each_entry_safe(zdev, tmp, &remove, entry) 105 zpci_remove_device(zdev); 106 } 107 108 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus) 109 { 110 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL; 111 } 112 113 int pci_domain_nr(struct pci_bus *bus) 114 { 115 return ((struct zpci_dev *) bus->sysdata)->domain; 116 } 117 EXPORT_SYMBOL_GPL(pci_domain_nr); 118 119 int pci_proc_domain(struct pci_bus *bus) 120 { 121 return pci_domain_nr(bus); 122 } 123 EXPORT_SYMBOL_GPL(pci_proc_domain); 124 125 /* Modify PCI: Register adapter interruptions */ 126 static int zpci_set_airq(struct zpci_dev *zdev) 127 { 128 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT); 129 struct zpci_fib fib = {0}; 130 u8 status; 131 132 fib.isc = PCI_ISC; 133 fib.sum = 1; /* enable summary notifications */ 134 fib.noi = airq_iv_end(zdev->aibv); 135 fib.aibv = (unsigned long) zdev->aibv->vector; 136 fib.aibvo = 0; /* each zdev has its own interrupt vector */ 137 fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8; 138 fib.aisbo = zdev->aisb & 63; 139 140 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0; 141 } 142 143 /* Modify PCI: Unregister adapter interruptions */ 144 static int zpci_clear_airq(struct zpci_dev *zdev) 145 { 146 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_DEREG_INT); 147 struct zpci_fib fib = {0}; 148 u8 cc, status; 149 150 cc = zpci_mod_fc(req, &fib, &status); 151 if (cc == 3 || (cc == 1 && status == 24)) 152 /* Function already gone or IRQs already deregistered. */ 153 cc = 0; 154 155 return cc ? -EIO : 0; 156 } 157 158 /* Modify PCI: Register I/O address translation parameters */ 159 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas, 160 u64 base, u64 limit, u64 iota) 161 { 162 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT); 163 struct zpci_fib fib = {0}; 164 u8 status; 165 166 WARN_ON_ONCE(iota & 0x3fff); 167 fib.pba = base; 168 fib.pal = limit; 169 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG; 170 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0; 171 } 172 173 /* Modify PCI: Unregister I/O address translation parameters */ 174 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas) 175 { 176 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT); 177 struct zpci_fib fib = {0}; 178 u8 cc, status; 179 180 cc = zpci_mod_fc(req, &fib, &status); 181 if (cc == 3) /* Function already gone. */ 182 cc = 0; 183 return cc ? -EIO : 0; 184 } 185 186 /* Modify PCI: Set PCI function measurement parameters */ 187 int zpci_fmb_enable_device(struct zpci_dev *zdev) 188 { 189 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE); 190 struct zpci_fib fib = {0}; 191 u8 cc, status; 192 193 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length) 194 return -EINVAL; 195 196 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL); 197 if (!zdev->fmb) 198 return -ENOMEM; 199 WARN_ON((u64) zdev->fmb & 0xf); 200 201 /* reset software counters */ 202 atomic64_set(&zdev->allocated_pages, 0); 203 atomic64_set(&zdev->mapped_pages, 0); 204 atomic64_set(&zdev->unmapped_pages, 0); 205 206 fib.fmb_addr = virt_to_phys(zdev->fmb); 207 cc = zpci_mod_fc(req, &fib, &status); 208 if (cc) { 209 kmem_cache_free(zdev_fmb_cache, zdev->fmb); 210 zdev->fmb = NULL; 211 } 212 return cc ? -EIO : 0; 213 } 214 215 /* Modify PCI: Disable PCI function measurement */ 216 int zpci_fmb_disable_device(struct zpci_dev *zdev) 217 { 218 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE); 219 struct zpci_fib fib = {0}; 220 u8 cc, status; 221 222 if (!zdev->fmb) 223 return -EINVAL; 224 225 /* Function measurement is disabled if fmb address is zero */ 226 cc = zpci_mod_fc(req, &fib, &status); 227 if (cc == 3) /* Function already gone. */ 228 cc = 0; 229 230 if (!cc) { 231 kmem_cache_free(zdev_fmb_cache, zdev->fmb); 232 zdev->fmb = NULL; 233 } 234 return cc ? -EIO : 0; 235 } 236 237 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len) 238 { 239 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len); 240 u64 data; 241 int rc; 242 243 rc = zpci_load(&data, req, offset); 244 if (!rc) { 245 data = le64_to_cpu((__force __le64) data); 246 data >>= (8 - len) * 8; 247 *val = (u32) data; 248 } else 249 *val = 0xffffffff; 250 return rc; 251 } 252 253 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len) 254 { 255 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len); 256 u64 data = val; 257 int rc; 258 259 data <<= (8 - len) * 8; 260 data = (__force u64) cpu_to_le64(data); 261 rc = zpci_store(data, req, offset); 262 return rc; 263 } 264 265 resource_size_t pcibios_align_resource(void *data, const struct resource *res, 266 resource_size_t size, 267 resource_size_t align) 268 { 269 return 0; 270 } 271 272 /* combine single writes by using store-block insn */ 273 void __iowrite64_copy(void __iomem *to, const void *from, size_t count) 274 { 275 zpci_memcpy_toio(to, from, count); 276 } 277 278 /* Create a virtual mapping cookie for a PCI BAR */ 279 void __iomem *pci_iomap_range(struct pci_dev *pdev, 280 int bar, 281 unsigned long offset, 282 unsigned long max) 283 { 284 struct zpci_dev *zdev = to_zpci(pdev); 285 int idx; 286 287 if (!pci_resource_len(pdev, bar)) 288 return NULL; 289 290 idx = zdev->bars[bar].map_idx; 291 spin_lock(&zpci_iomap_lock); 292 /* Detect overrun */ 293 WARN_ON(!++zpci_iomap_start[idx].count); 294 zpci_iomap_start[idx].fh = zdev->fh; 295 zpci_iomap_start[idx].bar = bar; 296 spin_unlock(&zpci_iomap_lock); 297 298 return (void __iomem *) ZPCI_ADDR(idx) + offset; 299 } 300 EXPORT_SYMBOL(pci_iomap_range); 301 302 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) 303 { 304 return pci_iomap_range(dev, bar, 0, maxlen); 305 } 306 EXPORT_SYMBOL(pci_iomap); 307 308 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr) 309 { 310 unsigned int idx = ZPCI_IDX(addr); 311 312 spin_lock(&zpci_iomap_lock); 313 /* Detect underrun */ 314 WARN_ON(!zpci_iomap_start[idx].count); 315 if (!--zpci_iomap_start[idx].count) { 316 zpci_iomap_start[idx].fh = 0; 317 zpci_iomap_start[idx].bar = 0; 318 } 319 spin_unlock(&zpci_iomap_lock); 320 } 321 EXPORT_SYMBOL(pci_iounmap); 322 323 static int pci_read(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_load(zdev, where, val, size); 333 334 return ret; 335 } 336 337 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, 338 int size, u32 val) 339 { 340 struct zpci_dev *zdev = get_zdev_by_bus(bus); 341 int ret; 342 343 if (!zdev || devfn != ZPCI_DEVFN) 344 ret = -ENODEV; 345 else 346 ret = zpci_cfg_store(zdev, where, val, size); 347 348 return ret; 349 } 350 351 static struct pci_ops pci_root_ops = { 352 .read = pci_read, 353 .write = pci_write, 354 }; 355 356 static void zpci_irq_handler(struct airq_struct *airq) 357 { 358 unsigned long si, ai; 359 struct airq_iv *aibv; 360 int irqs_on = 0; 361 362 inc_irq_stat(IRQIO_PCI); 363 for (si = 0;;) { 364 /* Scan adapter summary indicator bit vector */ 365 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv)); 366 if (si == -1UL) { 367 if (irqs_on++) 368 /* End of second scan with interrupts on. */ 369 break; 370 /* First scan complete, reenable interrupts. */ 371 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); 372 si = 0; 373 continue; 374 } 375 376 /* Scan the adapter interrupt vector for this device. */ 377 aibv = zpci_aibv[si]; 378 for (ai = 0;;) { 379 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv)); 380 if (ai == -1UL) 381 break; 382 inc_irq_stat(IRQIO_MSI); 383 airq_iv_lock(aibv, ai); 384 generic_handle_irq(airq_iv_get_data(aibv, ai)); 385 airq_iv_unlock(aibv, ai); 386 } 387 } 388 } 389 390 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) 391 { 392 struct zpci_dev *zdev = to_zpci(pdev); 393 unsigned int hwirq, msi_vecs; 394 unsigned long aisb; 395 struct msi_desc *msi; 396 struct msi_msg msg; 397 int rc, irq; 398 399 zdev->aisb = -1UL; 400 if (type == PCI_CAP_ID_MSI && nvec > 1) 401 return 1; 402 msi_vecs = min_t(unsigned int, nvec, zdev->max_msi); 403 404 /* Allocate adapter summary indicator bit */ 405 aisb = airq_iv_alloc_bit(zpci_aisb_iv); 406 if (aisb == -1UL) 407 return -EIO; 408 zdev->aisb = aisb; 409 410 /* Create adapter interrupt vector */ 411 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK); 412 if (!zdev->aibv) 413 return -ENOMEM; 414 415 /* Wire up shortcut pointer */ 416 zpci_aibv[aisb] = zdev->aibv; 417 418 /* Request MSI interrupts */ 419 hwirq = 0; 420 for_each_pci_msi_entry(msi, pdev) { 421 rc = -EIO; 422 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */ 423 if (irq < 0) 424 return -ENOMEM; 425 rc = irq_set_msi_desc(irq, msi); 426 if (rc) 427 return rc; 428 irq_set_chip_and_handler(irq, &zpci_irq_chip, 429 handle_simple_irq); 430 msg.data = hwirq; 431 msg.address_lo = zdev->msi_addr & 0xffffffff; 432 msg.address_hi = zdev->msi_addr >> 32; 433 pci_write_msi_msg(irq, &msg); 434 airq_iv_set_data(zdev->aibv, hwirq, irq); 435 hwirq++; 436 } 437 438 /* Enable adapter interrupts */ 439 rc = zpci_set_airq(zdev); 440 if (rc) 441 return rc; 442 443 return (msi_vecs == nvec) ? 0 : msi_vecs; 444 } 445 446 void arch_teardown_msi_irqs(struct pci_dev *pdev) 447 { 448 struct zpci_dev *zdev = to_zpci(pdev); 449 struct msi_desc *msi; 450 int rc; 451 452 /* Disable adapter interrupts */ 453 rc = zpci_clear_airq(zdev); 454 if (rc) 455 return; 456 457 /* Release MSI interrupts */ 458 for_each_pci_msi_entry(msi, pdev) { 459 if (!msi->irq) 460 continue; 461 if (msi->msi_attrib.is_msix) 462 __pci_msix_desc_mask_irq(msi, 1); 463 else 464 __pci_msi_desc_mask_irq(msi, 1, 1); 465 irq_set_msi_desc(msi->irq, NULL); 466 irq_free_desc(msi->irq); 467 msi->msg.address_lo = 0; 468 msi->msg.address_hi = 0; 469 msi->msg.data = 0; 470 msi->irq = 0; 471 } 472 473 if (zdev->aisb != -1UL) { 474 zpci_aibv[zdev->aisb] = NULL; 475 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb); 476 zdev->aisb = -1UL; 477 } 478 if (zdev->aibv) { 479 airq_iv_release(zdev->aibv); 480 zdev->aibv = NULL; 481 } 482 } 483 484 static void zpci_map_resources(struct pci_dev *pdev) 485 { 486 resource_size_t len; 487 int i; 488 489 for (i = 0; i < PCI_BAR_COUNT; i++) { 490 len = pci_resource_len(pdev, i); 491 if (!len) 492 continue; 493 pdev->resource[i].start = 494 (resource_size_t __force) pci_iomap(pdev, i, 0); 495 pdev->resource[i].end = pdev->resource[i].start + len - 1; 496 } 497 } 498 499 static void zpci_unmap_resources(struct pci_dev *pdev) 500 { 501 resource_size_t len; 502 int i; 503 504 for (i = 0; i < PCI_BAR_COUNT; i++) { 505 len = pci_resource_len(pdev, i); 506 if (!len) 507 continue; 508 pci_iounmap(pdev, (void __iomem __force *) 509 pdev->resource[i].start); 510 } 511 } 512 513 static struct airq_struct zpci_airq = { 514 .handler = zpci_irq_handler, 515 .isc = PCI_ISC, 516 }; 517 518 static int __init zpci_irq_init(void) 519 { 520 int rc; 521 522 rc = register_adapter_interrupt(&zpci_airq); 523 if (rc) 524 goto out; 525 /* Set summary to 1 to be called every time for the ISC. */ 526 *zpci_airq.lsi_ptr = 1; 527 528 rc = -ENOMEM; 529 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC); 530 if (!zpci_aisb_iv) 531 goto out_airq; 532 533 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); 534 return 0; 535 536 out_airq: 537 unregister_adapter_interrupt(&zpci_airq); 538 out: 539 return rc; 540 } 541 542 static void zpci_irq_exit(void) 543 { 544 airq_iv_release(zpci_aisb_iv); 545 unregister_adapter_interrupt(&zpci_airq); 546 } 547 548 static int zpci_alloc_iomap(struct zpci_dev *zdev) 549 { 550 unsigned long entry; 551 552 spin_lock(&zpci_iomap_lock); 553 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES); 554 if (entry == ZPCI_IOMAP_ENTRIES) { 555 spin_unlock(&zpci_iomap_lock); 556 return -ENOSPC; 557 } 558 set_bit(entry, zpci_iomap_bitmap); 559 spin_unlock(&zpci_iomap_lock); 560 return entry; 561 } 562 563 static void zpci_free_iomap(struct zpci_dev *zdev, int entry) 564 { 565 spin_lock(&zpci_iomap_lock); 566 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry)); 567 clear_bit(entry, zpci_iomap_bitmap); 568 spin_unlock(&zpci_iomap_lock); 569 } 570 571 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start, 572 unsigned long size, unsigned long flags) 573 { 574 struct resource *r; 575 576 r = kzalloc(sizeof(*r), GFP_KERNEL); 577 if (!r) 578 return NULL; 579 580 r->start = start; 581 r->end = r->start + size - 1; 582 r->flags = flags; 583 r->name = zdev->res_name; 584 585 if (request_resource(&iomem_resource, r)) { 586 kfree(r); 587 return NULL; 588 } 589 return r; 590 } 591 592 static int zpci_setup_bus_resources(struct zpci_dev *zdev, 593 struct list_head *resources) 594 { 595 unsigned long addr, size, flags; 596 struct resource *res; 597 int i, entry; 598 599 snprintf(zdev->res_name, sizeof(zdev->res_name), 600 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR); 601 602 for (i = 0; i < PCI_BAR_COUNT; i++) { 603 if (!zdev->bars[i].size) 604 continue; 605 entry = zpci_alloc_iomap(zdev); 606 if (entry < 0) 607 return entry; 608 zdev->bars[i].map_idx = entry; 609 610 /* only MMIO is supported */ 611 flags = IORESOURCE_MEM; 612 if (zdev->bars[i].val & 8) 613 flags |= IORESOURCE_PREFETCH; 614 if (zdev->bars[i].val & 4) 615 flags |= IORESOURCE_MEM_64; 616 617 addr = ZPCI_ADDR(entry); 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 || !zdev->bars[i].res) 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 resource *res; 649 int i; 650 651 pdev->dev.groups = zpci_attr_groups; 652 pdev->dev.dma_ops = &s390_pci_dma_ops; 653 zpci_map_resources(pdev); 654 655 for (i = 0; i < PCI_BAR_COUNT; i++) { 656 res = &pdev->resource[i]; 657 if (res->parent || !res->flags) 658 continue; 659 pci_claim_resource(pdev, i); 660 } 661 662 return 0; 663 } 664 665 void pcibios_release_device(struct pci_dev *pdev) 666 { 667 zpci_unmap_resources(pdev); 668 } 669 670 int pcibios_enable_device(struct pci_dev *pdev, int mask) 671 { 672 struct zpci_dev *zdev = to_zpci(pdev); 673 674 zpci_debug_init_device(zdev, dev_name(&pdev->dev)); 675 zpci_fmb_enable_device(zdev); 676 677 return pci_enable_resources(pdev, mask); 678 } 679 680 void pcibios_disable_device(struct pci_dev *pdev) 681 { 682 struct zpci_dev *zdev = to_zpci(pdev); 683 684 zpci_fmb_disable_device(zdev); 685 zpci_debug_exit_device(zdev); 686 } 687 688 #ifdef CONFIG_HIBERNATE_CALLBACKS 689 static int zpci_restore(struct device *dev) 690 { 691 struct pci_dev *pdev = to_pci_dev(dev); 692 struct zpci_dev *zdev = to_zpci(pdev); 693 int ret = 0; 694 695 if (zdev->state != ZPCI_FN_STATE_ONLINE) 696 goto out; 697 698 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 699 if (ret) 700 goto out; 701 702 zpci_map_resources(pdev); 703 zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma, 704 (u64) zdev->dma_table); 705 706 out: 707 return ret; 708 } 709 710 static int zpci_freeze(struct device *dev) 711 { 712 struct pci_dev *pdev = to_pci_dev(dev); 713 struct zpci_dev *zdev = to_zpci(pdev); 714 715 if (zdev->state != ZPCI_FN_STATE_ONLINE) 716 return 0; 717 718 zpci_unregister_ioat(zdev, 0); 719 zpci_unmap_resources(pdev); 720 return clp_disable_fh(zdev); 721 } 722 723 struct dev_pm_ops pcibios_pm_ops = { 724 .thaw_noirq = zpci_restore, 725 .freeze_noirq = zpci_freeze, 726 .restore_noirq = zpci_restore, 727 .poweroff_noirq = zpci_freeze, 728 }; 729 #endif /* CONFIG_HIBERNATE_CALLBACKS */ 730 731 static int zpci_alloc_domain(struct zpci_dev *zdev) 732 { 733 if (zpci_unique_uid) { 734 zdev->domain = (u16) zdev->uid; 735 if (zdev->domain >= ZPCI_NR_DEVICES) 736 return 0; 737 738 spin_lock(&zpci_domain_lock); 739 if (test_bit(zdev->domain, zpci_domain)) { 740 spin_unlock(&zpci_domain_lock); 741 return -EEXIST; 742 } 743 set_bit(zdev->domain, zpci_domain); 744 spin_unlock(&zpci_domain_lock); 745 return 0; 746 } 747 748 spin_lock(&zpci_domain_lock); 749 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES); 750 if (zdev->domain == ZPCI_NR_DEVICES) { 751 spin_unlock(&zpci_domain_lock); 752 return -ENOSPC; 753 } 754 set_bit(zdev->domain, zpci_domain); 755 spin_unlock(&zpci_domain_lock); 756 return 0; 757 } 758 759 static void zpci_free_domain(struct zpci_dev *zdev) 760 { 761 if (zdev->domain >= ZPCI_NR_DEVICES) 762 return; 763 764 spin_lock(&zpci_domain_lock); 765 clear_bit(zdev->domain, zpci_domain); 766 spin_unlock(&zpci_domain_lock); 767 } 768 769 void pcibios_remove_bus(struct pci_bus *bus) 770 { 771 struct zpci_dev *zdev = get_zdev_by_bus(bus); 772 773 zpci_exit_slot(zdev); 774 zpci_cleanup_bus_resources(zdev); 775 zpci_destroy_iommu(zdev); 776 zpci_free_domain(zdev); 777 778 spin_lock(&zpci_list_lock); 779 list_del(&zdev->entry); 780 spin_unlock(&zpci_list_lock); 781 782 zpci_dbg(3, "rem fid:%x\n", zdev->fid); 783 kfree(zdev); 784 } 785 786 static int zpci_scan_bus(struct zpci_dev *zdev) 787 { 788 LIST_HEAD(resources); 789 int ret; 790 791 ret = zpci_setup_bus_resources(zdev, &resources); 792 if (ret) 793 goto error; 794 795 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops, 796 zdev, &resources); 797 if (!zdev->bus) { 798 ret = -EIO; 799 goto error; 800 } 801 zdev->bus->max_bus_speed = zdev->max_bus_speed; 802 pci_bus_add_devices(zdev->bus); 803 return 0; 804 805 error: 806 zpci_cleanup_bus_resources(zdev); 807 pci_free_resource_list(&resources); 808 return ret; 809 } 810 811 int zpci_enable_device(struct zpci_dev *zdev) 812 { 813 int rc; 814 815 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 816 if (rc) 817 goto out; 818 819 rc = zpci_dma_init_device(zdev); 820 if (rc) 821 goto out_dma; 822 823 zdev->state = ZPCI_FN_STATE_ONLINE; 824 return 0; 825 826 out_dma: 827 clp_disable_fh(zdev); 828 out: 829 return rc; 830 } 831 EXPORT_SYMBOL_GPL(zpci_enable_device); 832 833 int zpci_disable_device(struct zpci_dev *zdev) 834 { 835 zpci_dma_exit_device(zdev); 836 return clp_disable_fh(zdev); 837 } 838 EXPORT_SYMBOL_GPL(zpci_disable_device); 839 840 int zpci_create_device(struct zpci_dev *zdev) 841 { 842 int rc; 843 844 rc = zpci_alloc_domain(zdev); 845 if (rc) 846 goto out; 847 848 rc = zpci_init_iommu(zdev); 849 if (rc) 850 goto out_free; 851 852 mutex_init(&zdev->lock); 853 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) { 854 rc = zpci_enable_device(zdev); 855 if (rc) 856 goto out_destroy_iommu; 857 } 858 rc = zpci_scan_bus(zdev); 859 if (rc) 860 goto out_disable; 861 862 spin_lock(&zpci_list_lock); 863 list_add_tail(&zdev->entry, &zpci_list); 864 spin_unlock(&zpci_list_lock); 865 866 zpci_init_slot(zdev); 867 868 return 0; 869 870 out_disable: 871 if (zdev->state == ZPCI_FN_STATE_ONLINE) 872 zpci_disable_device(zdev); 873 out_destroy_iommu: 874 zpci_destroy_iommu(zdev); 875 out_free: 876 zpci_free_domain(zdev); 877 out: 878 return rc; 879 } 880 881 void zpci_remove_device(struct zpci_dev *zdev) 882 { 883 if (!zdev->bus) 884 return; 885 886 pci_stop_root_bus(zdev->bus); 887 pci_remove_root_bus(zdev->bus); 888 } 889 890 int zpci_report_error(struct pci_dev *pdev, 891 struct zpci_report_error_header *report) 892 { 893 struct zpci_dev *zdev = to_zpci(pdev); 894 895 return sclp_pci_report(report, zdev->fh, zdev->fid); 896 } 897 EXPORT_SYMBOL(zpci_report_error); 898 899 static int zpci_mem_init(void) 900 { 901 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) || 902 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb)); 903 904 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb), 905 __alignof__(struct zpci_fmb), 0, NULL); 906 if (!zdev_fmb_cache) 907 goto error_fmb; 908 909 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES, 910 sizeof(*zpci_iomap_start), GFP_KERNEL); 911 if (!zpci_iomap_start) 912 goto error_iomap; 913 914 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES), 915 sizeof(*zpci_iomap_bitmap), GFP_KERNEL); 916 if (!zpci_iomap_bitmap) 917 goto error_iomap_bitmap; 918 919 return 0; 920 error_iomap_bitmap: 921 kfree(zpci_iomap_start); 922 error_iomap: 923 kmem_cache_destroy(zdev_fmb_cache); 924 error_fmb: 925 return -ENOMEM; 926 } 927 928 static void zpci_mem_exit(void) 929 { 930 kfree(zpci_iomap_bitmap); 931 kfree(zpci_iomap_start); 932 kmem_cache_destroy(zdev_fmb_cache); 933 } 934 935 static unsigned int s390_pci_probe = 1; 936 static unsigned int s390_pci_initialized; 937 938 char * __init pcibios_setup(char *str) 939 { 940 if (!strcmp(str, "off")) { 941 s390_pci_probe = 0; 942 return NULL; 943 } 944 return str; 945 } 946 947 bool zpci_is_enabled(void) 948 { 949 return s390_pci_initialized; 950 } 951 952 static int __init pci_base_init(void) 953 { 954 int rc; 955 956 if (!s390_pci_probe) 957 return 0; 958 959 if (!test_facility(69) || !test_facility(71) || !test_facility(72)) 960 return 0; 961 962 rc = zpci_debug_init(); 963 if (rc) 964 goto out; 965 966 rc = zpci_mem_init(); 967 if (rc) 968 goto out_mem; 969 970 rc = zpci_irq_init(); 971 if (rc) 972 goto out_irq; 973 974 rc = zpci_dma_init(); 975 if (rc) 976 goto out_dma; 977 978 rc = clp_scan_pci_devices(); 979 if (rc) 980 goto out_find; 981 982 s390_pci_initialized = 1; 983 return 0; 984 985 out_find: 986 zpci_dma_exit(); 987 out_dma: 988 zpci_irq_exit(); 989 out_irq: 990 zpci_mem_exit(); 991 out_mem: 992 zpci_debug_exit(); 993 out: 994 return rc; 995 } 996 subsys_initcall_sync(pci_base_init); 997 998 void zpci_rescan(void) 999 { 1000 if (zpci_is_enabled()) 1001 clp_rescan_pci_devices_simple(); 1002 } 1003