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 if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC)) 372 break; 373 si = 0; 374 continue; 375 } 376 377 /* Scan the adapter interrupt vector for this device. */ 378 aibv = zpci_aibv[si]; 379 for (ai = 0;;) { 380 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv)); 381 if (ai == -1UL) 382 break; 383 inc_irq_stat(IRQIO_MSI); 384 airq_iv_lock(aibv, ai); 385 generic_handle_irq(airq_iv_get_data(aibv, ai)); 386 airq_iv_unlock(aibv, ai); 387 } 388 } 389 } 390 391 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) 392 { 393 struct zpci_dev *zdev = to_zpci(pdev); 394 unsigned int hwirq, msi_vecs; 395 unsigned long aisb; 396 struct msi_desc *msi; 397 struct msi_msg msg; 398 int rc, irq; 399 400 zdev->aisb = -1UL; 401 if (type == PCI_CAP_ID_MSI && nvec > 1) 402 return 1; 403 msi_vecs = min_t(unsigned int, nvec, zdev->max_msi); 404 405 /* Allocate adapter summary indicator bit */ 406 aisb = airq_iv_alloc_bit(zpci_aisb_iv); 407 if (aisb == -1UL) 408 return -EIO; 409 zdev->aisb = aisb; 410 411 /* Create adapter interrupt vector */ 412 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK); 413 if (!zdev->aibv) 414 return -ENOMEM; 415 416 /* Wire up shortcut pointer */ 417 zpci_aibv[aisb] = zdev->aibv; 418 419 /* Request MSI interrupts */ 420 hwirq = 0; 421 for_each_pci_msi_entry(msi, pdev) { 422 rc = -EIO; 423 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */ 424 if (irq < 0) 425 return -ENOMEM; 426 rc = irq_set_msi_desc(irq, msi); 427 if (rc) 428 return rc; 429 irq_set_chip_and_handler(irq, &zpci_irq_chip, 430 handle_simple_irq); 431 msg.data = hwirq; 432 msg.address_lo = zdev->msi_addr & 0xffffffff; 433 msg.address_hi = zdev->msi_addr >> 32; 434 pci_write_msi_msg(irq, &msg); 435 airq_iv_set_data(zdev->aibv, hwirq, irq); 436 hwirq++; 437 } 438 439 /* Enable adapter interrupts */ 440 rc = zpci_set_airq(zdev); 441 if (rc) 442 return rc; 443 444 return (msi_vecs == nvec) ? 0 : msi_vecs; 445 } 446 447 void arch_teardown_msi_irqs(struct pci_dev *pdev) 448 { 449 struct zpci_dev *zdev = to_zpci(pdev); 450 struct msi_desc *msi; 451 int rc; 452 453 /* Disable adapter interrupts */ 454 rc = zpci_clear_airq(zdev); 455 if (rc) 456 return; 457 458 /* Release MSI interrupts */ 459 for_each_pci_msi_entry(msi, pdev) { 460 if (!msi->irq) 461 continue; 462 if (msi->msi_attrib.is_msix) 463 __pci_msix_desc_mask_irq(msi, 1); 464 else 465 __pci_msi_desc_mask_irq(msi, 1, 1); 466 irq_set_msi_desc(msi->irq, NULL); 467 irq_free_desc(msi->irq); 468 msi->msg.address_lo = 0; 469 msi->msg.address_hi = 0; 470 msi->msg.data = 0; 471 msi->irq = 0; 472 } 473 474 if (zdev->aisb != -1UL) { 475 zpci_aibv[zdev->aisb] = NULL; 476 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb); 477 zdev->aisb = -1UL; 478 } 479 if (zdev->aibv) { 480 airq_iv_release(zdev->aibv); 481 zdev->aibv = NULL; 482 } 483 } 484 485 static void zpci_map_resources(struct pci_dev *pdev) 486 { 487 resource_size_t len; 488 int i; 489 490 for (i = 0; i < PCI_BAR_COUNT; i++) { 491 len = pci_resource_len(pdev, i); 492 if (!len) 493 continue; 494 pdev->resource[i].start = 495 (resource_size_t __force) pci_iomap(pdev, i, 0); 496 pdev->resource[i].end = pdev->resource[i].start + len - 1; 497 } 498 } 499 500 static void zpci_unmap_resources(struct pci_dev *pdev) 501 { 502 resource_size_t len; 503 int i; 504 505 for (i = 0; i < PCI_BAR_COUNT; i++) { 506 len = pci_resource_len(pdev, i); 507 if (!len) 508 continue; 509 pci_iounmap(pdev, (void __iomem __force *) 510 pdev->resource[i].start); 511 } 512 } 513 514 static struct airq_struct zpci_airq = { 515 .handler = zpci_irq_handler, 516 .isc = PCI_ISC, 517 }; 518 519 static int __init zpci_irq_init(void) 520 { 521 int rc; 522 523 rc = register_adapter_interrupt(&zpci_airq); 524 if (rc) 525 goto out; 526 /* Set summary to 1 to be called every time for the ISC. */ 527 *zpci_airq.lsi_ptr = 1; 528 529 rc = -ENOMEM; 530 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC); 531 if (!zpci_aisb_iv) 532 goto out_airq; 533 534 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); 535 return 0; 536 537 out_airq: 538 unregister_adapter_interrupt(&zpci_airq); 539 out: 540 return rc; 541 } 542 543 static void zpci_irq_exit(void) 544 { 545 airq_iv_release(zpci_aisb_iv); 546 unregister_adapter_interrupt(&zpci_airq); 547 } 548 549 static int zpci_alloc_iomap(struct zpci_dev *zdev) 550 { 551 unsigned long entry; 552 553 spin_lock(&zpci_iomap_lock); 554 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES); 555 if (entry == ZPCI_IOMAP_ENTRIES) { 556 spin_unlock(&zpci_iomap_lock); 557 return -ENOSPC; 558 } 559 set_bit(entry, zpci_iomap_bitmap); 560 spin_unlock(&zpci_iomap_lock); 561 return entry; 562 } 563 564 static void zpci_free_iomap(struct zpci_dev *zdev, int entry) 565 { 566 spin_lock(&zpci_iomap_lock); 567 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry)); 568 clear_bit(entry, zpci_iomap_bitmap); 569 spin_unlock(&zpci_iomap_lock); 570 } 571 572 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start, 573 unsigned long size, unsigned long flags) 574 { 575 struct resource *r; 576 577 r = kzalloc(sizeof(*r), GFP_KERNEL); 578 if (!r) 579 return NULL; 580 581 r->start = start; 582 r->end = r->start + size - 1; 583 r->flags = flags; 584 r->name = zdev->res_name; 585 586 if (request_resource(&iomem_resource, r)) { 587 kfree(r); 588 return NULL; 589 } 590 return r; 591 } 592 593 static int zpci_setup_bus_resources(struct zpci_dev *zdev, 594 struct list_head *resources) 595 { 596 unsigned long addr, size, flags; 597 struct resource *res; 598 int i, entry; 599 600 snprintf(zdev->res_name, sizeof(zdev->res_name), 601 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR); 602 603 for (i = 0; i < PCI_BAR_COUNT; i++) { 604 if (!zdev->bars[i].size) 605 continue; 606 entry = zpci_alloc_iomap(zdev); 607 if (entry < 0) 608 return entry; 609 zdev->bars[i].map_idx = entry; 610 611 /* only MMIO is supported */ 612 flags = IORESOURCE_MEM; 613 if (zdev->bars[i].val & 8) 614 flags |= IORESOURCE_PREFETCH; 615 if (zdev->bars[i].val & 4) 616 flags |= IORESOURCE_MEM_64; 617 618 addr = ZPCI_ADDR(entry); 619 size = 1UL << zdev->bars[i].size; 620 621 res = __alloc_res(zdev, addr, size, flags); 622 if (!res) { 623 zpci_free_iomap(zdev, entry); 624 return -ENOMEM; 625 } 626 zdev->bars[i].res = res; 627 pci_add_resource(resources, res); 628 } 629 630 return 0; 631 } 632 633 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev) 634 { 635 int i; 636 637 for (i = 0; i < PCI_BAR_COUNT; i++) { 638 if (!zdev->bars[i].size || !zdev->bars[i].res) 639 continue; 640 641 zpci_free_iomap(zdev, zdev->bars[i].map_idx); 642 release_resource(zdev->bars[i].res); 643 kfree(zdev->bars[i].res); 644 } 645 } 646 647 int pcibios_add_device(struct pci_dev *pdev) 648 { 649 struct resource *res; 650 int i; 651 652 pdev->dev.groups = zpci_attr_groups; 653 pdev->dev.dma_ops = &s390_pci_dma_ops; 654 zpci_map_resources(pdev); 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 void pcibios_release_device(struct pci_dev *pdev) 667 { 668 zpci_unmap_resources(pdev); 669 } 670 671 int pcibios_enable_device(struct pci_dev *pdev, int mask) 672 { 673 struct zpci_dev *zdev = to_zpci(pdev); 674 675 zpci_debug_init_device(zdev, dev_name(&pdev->dev)); 676 zpci_fmb_enable_device(zdev); 677 678 return pci_enable_resources(pdev, mask); 679 } 680 681 void pcibios_disable_device(struct pci_dev *pdev) 682 { 683 struct zpci_dev *zdev = to_zpci(pdev); 684 685 zpci_fmb_disable_device(zdev); 686 zpci_debug_exit_device(zdev); 687 } 688 689 #ifdef CONFIG_HIBERNATE_CALLBACKS 690 static int zpci_restore(struct device *dev) 691 { 692 struct pci_dev *pdev = to_pci_dev(dev); 693 struct zpci_dev *zdev = to_zpci(pdev); 694 int ret = 0; 695 696 if (zdev->state != ZPCI_FN_STATE_ONLINE) 697 goto out; 698 699 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 700 if (ret) 701 goto out; 702 703 zpci_map_resources(pdev); 704 zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma, 705 (u64) zdev->dma_table); 706 707 out: 708 return ret; 709 } 710 711 static int zpci_freeze(struct device *dev) 712 { 713 struct pci_dev *pdev = to_pci_dev(dev); 714 struct zpci_dev *zdev = to_zpci(pdev); 715 716 if (zdev->state != ZPCI_FN_STATE_ONLINE) 717 return 0; 718 719 zpci_unregister_ioat(zdev, 0); 720 zpci_unmap_resources(pdev); 721 return clp_disable_fh(zdev); 722 } 723 724 struct dev_pm_ops pcibios_pm_ops = { 725 .thaw_noirq = zpci_restore, 726 .freeze_noirq = zpci_freeze, 727 .restore_noirq = zpci_restore, 728 .poweroff_noirq = zpci_freeze, 729 }; 730 #endif /* CONFIG_HIBERNATE_CALLBACKS */ 731 732 static int zpci_alloc_domain(struct zpci_dev *zdev) 733 { 734 if (zpci_unique_uid) { 735 zdev->domain = (u16) zdev->uid; 736 if (zdev->domain >= ZPCI_NR_DEVICES) 737 return 0; 738 739 spin_lock(&zpci_domain_lock); 740 if (test_bit(zdev->domain, zpci_domain)) { 741 spin_unlock(&zpci_domain_lock); 742 return -EEXIST; 743 } 744 set_bit(zdev->domain, zpci_domain); 745 spin_unlock(&zpci_domain_lock); 746 return 0; 747 } 748 749 spin_lock(&zpci_domain_lock); 750 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES); 751 if (zdev->domain == ZPCI_NR_DEVICES) { 752 spin_unlock(&zpci_domain_lock); 753 return -ENOSPC; 754 } 755 set_bit(zdev->domain, zpci_domain); 756 spin_unlock(&zpci_domain_lock); 757 return 0; 758 } 759 760 static void zpci_free_domain(struct zpci_dev *zdev) 761 { 762 if (zdev->domain >= ZPCI_NR_DEVICES) 763 return; 764 765 spin_lock(&zpci_domain_lock); 766 clear_bit(zdev->domain, zpci_domain); 767 spin_unlock(&zpci_domain_lock); 768 } 769 770 void pcibios_remove_bus(struct pci_bus *bus) 771 { 772 struct zpci_dev *zdev = get_zdev_by_bus(bus); 773 774 zpci_exit_slot(zdev); 775 zpci_cleanup_bus_resources(zdev); 776 zpci_destroy_iommu(zdev); 777 zpci_free_domain(zdev); 778 779 spin_lock(&zpci_list_lock); 780 list_del(&zdev->entry); 781 spin_unlock(&zpci_list_lock); 782 783 zpci_dbg(3, "rem fid:%x\n", zdev->fid); 784 kfree(zdev); 785 } 786 787 static int zpci_scan_bus(struct zpci_dev *zdev) 788 { 789 LIST_HEAD(resources); 790 int ret; 791 792 ret = zpci_setup_bus_resources(zdev, &resources); 793 if (ret) 794 goto error; 795 796 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops, 797 zdev, &resources); 798 if (!zdev->bus) { 799 ret = -EIO; 800 goto error; 801 } 802 zdev->bus->max_bus_speed = zdev->max_bus_speed; 803 pci_bus_add_devices(zdev->bus); 804 return 0; 805 806 error: 807 zpci_cleanup_bus_resources(zdev); 808 pci_free_resource_list(&resources); 809 return ret; 810 } 811 812 int zpci_enable_device(struct zpci_dev *zdev) 813 { 814 int rc; 815 816 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 817 if (rc) 818 goto out; 819 820 rc = zpci_dma_init_device(zdev); 821 if (rc) 822 goto out_dma; 823 824 zdev->state = ZPCI_FN_STATE_ONLINE; 825 return 0; 826 827 out_dma: 828 clp_disable_fh(zdev); 829 out: 830 return rc; 831 } 832 EXPORT_SYMBOL_GPL(zpci_enable_device); 833 834 int zpci_disable_device(struct zpci_dev *zdev) 835 { 836 zpci_dma_exit_device(zdev); 837 return clp_disable_fh(zdev); 838 } 839 EXPORT_SYMBOL_GPL(zpci_disable_device); 840 841 int zpci_create_device(struct zpci_dev *zdev) 842 { 843 int rc; 844 845 rc = zpci_alloc_domain(zdev); 846 if (rc) 847 goto out; 848 849 rc = zpci_init_iommu(zdev); 850 if (rc) 851 goto out_free; 852 853 mutex_init(&zdev->lock); 854 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) { 855 rc = zpci_enable_device(zdev); 856 if (rc) 857 goto out_destroy_iommu; 858 } 859 rc = zpci_scan_bus(zdev); 860 if (rc) 861 goto out_disable; 862 863 spin_lock(&zpci_list_lock); 864 list_add_tail(&zdev->entry, &zpci_list); 865 spin_unlock(&zpci_list_lock); 866 867 zpci_init_slot(zdev); 868 869 return 0; 870 871 out_disable: 872 if (zdev->state == ZPCI_FN_STATE_ONLINE) 873 zpci_disable_device(zdev); 874 out_destroy_iommu: 875 zpci_destroy_iommu(zdev); 876 out_free: 877 zpci_free_domain(zdev); 878 out: 879 return rc; 880 } 881 882 void zpci_remove_device(struct zpci_dev *zdev) 883 { 884 if (!zdev->bus) 885 return; 886 887 pci_stop_root_bus(zdev->bus); 888 pci_remove_root_bus(zdev->bus); 889 } 890 891 int zpci_report_error(struct pci_dev *pdev, 892 struct zpci_report_error_header *report) 893 { 894 struct zpci_dev *zdev = to_zpci(pdev); 895 896 return sclp_pci_report(report, zdev->fh, zdev->fid); 897 } 898 EXPORT_SYMBOL(zpci_report_error); 899 900 static int zpci_mem_init(void) 901 { 902 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) || 903 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb)); 904 905 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb), 906 __alignof__(struct zpci_fmb), 0, NULL); 907 if (!zdev_fmb_cache) 908 goto error_fmb; 909 910 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES, 911 sizeof(*zpci_iomap_start), GFP_KERNEL); 912 if (!zpci_iomap_start) 913 goto error_iomap; 914 915 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES), 916 sizeof(*zpci_iomap_bitmap), GFP_KERNEL); 917 if (!zpci_iomap_bitmap) 918 goto error_iomap_bitmap; 919 920 return 0; 921 error_iomap_bitmap: 922 kfree(zpci_iomap_start); 923 error_iomap: 924 kmem_cache_destroy(zdev_fmb_cache); 925 error_fmb: 926 return -ENOMEM; 927 } 928 929 static void zpci_mem_exit(void) 930 { 931 kfree(zpci_iomap_bitmap); 932 kfree(zpci_iomap_start); 933 kmem_cache_destroy(zdev_fmb_cache); 934 } 935 936 static unsigned int s390_pci_probe = 1; 937 static unsigned int s390_pci_initialized; 938 939 char * __init pcibios_setup(char *str) 940 { 941 if (!strcmp(str, "off")) { 942 s390_pci_probe = 0; 943 return NULL; 944 } 945 return str; 946 } 947 948 bool zpci_is_enabled(void) 949 { 950 return s390_pci_initialized; 951 } 952 953 static int __init pci_base_init(void) 954 { 955 int rc; 956 957 if (!s390_pci_probe) 958 return 0; 959 960 if (!test_facility(69) || !test_facility(71)) 961 return 0; 962 963 rc = zpci_debug_init(); 964 if (rc) 965 goto out; 966 967 rc = zpci_mem_init(); 968 if (rc) 969 goto out_mem; 970 971 rc = zpci_irq_init(); 972 if (rc) 973 goto out_irq; 974 975 rc = zpci_dma_init(); 976 if (rc) 977 goto out_dma; 978 979 rc = clp_scan_pci_devices(); 980 if (rc) 981 goto out_find; 982 983 s390_pci_initialized = 1; 984 return 0; 985 986 out_find: 987 zpci_dma_exit(); 988 out_dma: 989 zpci_irq_exit(); 990 out_irq: 991 zpci_mem_exit(); 992 out_mem: 993 zpci_debug_exit(); 994 out: 995 return rc; 996 } 997 subsys_initcall_sync(pci_base_init); 998 999 void zpci_rescan(void) 1000 { 1001 if (zpci_is_enabled()) 1002 clp_rescan_pci_devices_simple(); 1003 } 1004