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 void pcibios_fixup_bus(struct pci_bus *bus) 266 { 267 } 268 269 resource_size_t pcibios_align_resource(void *data, const struct resource *res, 270 resource_size_t size, 271 resource_size_t align) 272 { 273 return 0; 274 } 275 276 /* combine single writes by using store-block insn */ 277 void __iowrite64_copy(void __iomem *to, const void *from, size_t count) 278 { 279 zpci_memcpy_toio(to, from, count); 280 } 281 282 /* Create a virtual mapping cookie for a PCI BAR */ 283 void __iomem *pci_iomap_range(struct pci_dev *pdev, 284 int bar, 285 unsigned long offset, 286 unsigned long max) 287 { 288 struct zpci_dev *zdev = to_zpci(pdev); 289 int idx; 290 291 if (!pci_resource_len(pdev, bar)) 292 return NULL; 293 294 idx = zdev->bars[bar].map_idx; 295 spin_lock(&zpci_iomap_lock); 296 /* Detect overrun */ 297 WARN_ON(!++zpci_iomap_start[idx].count); 298 zpci_iomap_start[idx].fh = zdev->fh; 299 zpci_iomap_start[idx].bar = bar; 300 spin_unlock(&zpci_iomap_lock); 301 302 return (void __iomem *) ZPCI_ADDR(idx) + offset; 303 } 304 EXPORT_SYMBOL(pci_iomap_range); 305 306 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) 307 { 308 return pci_iomap_range(dev, bar, 0, maxlen); 309 } 310 EXPORT_SYMBOL(pci_iomap); 311 312 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr) 313 { 314 unsigned int idx = ZPCI_IDX(addr); 315 316 spin_lock(&zpci_iomap_lock); 317 /* Detect underrun */ 318 WARN_ON(!zpci_iomap_start[idx].count); 319 if (!--zpci_iomap_start[idx].count) { 320 zpci_iomap_start[idx].fh = 0; 321 zpci_iomap_start[idx].bar = 0; 322 } 323 spin_unlock(&zpci_iomap_lock); 324 } 325 EXPORT_SYMBOL(pci_iounmap); 326 327 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, 328 int size, u32 *val) 329 { 330 struct zpci_dev *zdev = get_zdev_by_bus(bus); 331 int ret; 332 333 if (!zdev || devfn != ZPCI_DEVFN) 334 ret = -ENODEV; 335 else 336 ret = zpci_cfg_load(zdev, where, val, size); 337 338 return ret; 339 } 340 341 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, 342 int size, u32 val) 343 { 344 struct zpci_dev *zdev = get_zdev_by_bus(bus); 345 int ret; 346 347 if (!zdev || devfn != ZPCI_DEVFN) 348 ret = -ENODEV; 349 else 350 ret = zpci_cfg_store(zdev, where, val, size); 351 352 return ret; 353 } 354 355 static struct pci_ops pci_root_ops = { 356 .read = pci_read, 357 .write = pci_write, 358 }; 359 360 static void zpci_irq_handler(struct airq_struct *airq) 361 { 362 unsigned long si, ai; 363 struct airq_iv *aibv; 364 int irqs_on = 0; 365 366 inc_irq_stat(IRQIO_PCI); 367 for (si = 0;;) { 368 /* Scan adapter summary indicator bit vector */ 369 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv)); 370 if (si == -1UL) { 371 if (irqs_on++) 372 /* End of second scan with interrupts on. */ 373 break; 374 /* First scan complete, reenable interrupts. */ 375 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); 376 si = 0; 377 continue; 378 } 379 380 /* Scan the adapter interrupt vector for this device. */ 381 aibv = zpci_aibv[si]; 382 for (ai = 0;;) { 383 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv)); 384 if (ai == -1UL) 385 break; 386 inc_irq_stat(IRQIO_MSI); 387 airq_iv_lock(aibv, ai); 388 generic_handle_irq(airq_iv_get_data(aibv, ai)); 389 airq_iv_unlock(aibv, ai); 390 } 391 } 392 } 393 394 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) 395 { 396 struct zpci_dev *zdev = to_zpci(pdev); 397 unsigned int hwirq, msi_vecs; 398 unsigned long aisb; 399 struct msi_desc *msi; 400 struct msi_msg msg; 401 int rc, irq; 402 403 zdev->aisb = -1UL; 404 if (type == PCI_CAP_ID_MSI && nvec > 1) 405 return 1; 406 msi_vecs = min_t(unsigned int, nvec, zdev->max_msi); 407 408 /* Allocate adapter summary indicator bit */ 409 aisb = airq_iv_alloc_bit(zpci_aisb_iv); 410 if (aisb == -1UL) 411 return -EIO; 412 zdev->aisb = aisb; 413 414 /* Create adapter interrupt vector */ 415 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK); 416 if (!zdev->aibv) 417 return -ENOMEM; 418 419 /* Wire up shortcut pointer */ 420 zpci_aibv[aisb] = zdev->aibv; 421 422 /* Request MSI interrupts */ 423 hwirq = 0; 424 for_each_pci_msi_entry(msi, pdev) { 425 rc = -EIO; 426 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */ 427 if (irq < 0) 428 return -ENOMEM; 429 rc = irq_set_msi_desc(irq, msi); 430 if (rc) 431 return rc; 432 irq_set_chip_and_handler(irq, &zpci_irq_chip, 433 handle_simple_irq); 434 msg.data = hwirq; 435 msg.address_lo = zdev->msi_addr & 0xffffffff; 436 msg.address_hi = zdev->msi_addr >> 32; 437 pci_write_msi_msg(irq, &msg); 438 airq_iv_set_data(zdev->aibv, hwirq, irq); 439 hwirq++; 440 } 441 442 /* Enable adapter interrupts */ 443 rc = zpci_set_airq(zdev); 444 if (rc) 445 return rc; 446 447 return (msi_vecs == nvec) ? 0 : msi_vecs; 448 } 449 450 void arch_teardown_msi_irqs(struct pci_dev *pdev) 451 { 452 struct zpci_dev *zdev = to_zpci(pdev); 453 struct msi_desc *msi; 454 int rc; 455 456 /* Disable adapter interrupts */ 457 rc = zpci_clear_airq(zdev); 458 if (rc) 459 return; 460 461 /* Release MSI interrupts */ 462 for_each_pci_msi_entry(msi, pdev) { 463 if (!msi->irq) 464 continue; 465 if (msi->msi_attrib.is_msix) 466 __pci_msix_desc_mask_irq(msi, 1); 467 else 468 __pci_msi_desc_mask_irq(msi, 1, 1); 469 irq_set_msi_desc(msi->irq, NULL); 470 irq_free_desc(msi->irq); 471 msi->msg.address_lo = 0; 472 msi->msg.address_hi = 0; 473 msi->msg.data = 0; 474 msi->irq = 0; 475 } 476 477 if (zdev->aisb != -1UL) { 478 zpci_aibv[zdev->aisb] = NULL; 479 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb); 480 zdev->aisb = -1UL; 481 } 482 if (zdev->aibv) { 483 airq_iv_release(zdev->aibv); 484 zdev->aibv = NULL; 485 } 486 } 487 488 static void zpci_map_resources(struct pci_dev *pdev) 489 { 490 resource_size_t len; 491 int i; 492 493 for (i = 0; i < PCI_BAR_COUNT; i++) { 494 len = pci_resource_len(pdev, i); 495 if (!len) 496 continue; 497 pdev->resource[i].start = 498 (resource_size_t __force) pci_iomap(pdev, i, 0); 499 pdev->resource[i].end = pdev->resource[i].start + len - 1; 500 } 501 } 502 503 static void zpci_unmap_resources(struct pci_dev *pdev) 504 { 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 struct airq_struct zpci_airq = { 518 .handler = zpci_irq_handler, 519 .isc = PCI_ISC, 520 }; 521 522 static int __init zpci_irq_init(void) 523 { 524 int rc; 525 526 rc = register_adapter_interrupt(&zpci_airq); 527 if (rc) 528 goto out; 529 /* Set summary to 1 to be called every time for the ISC. */ 530 *zpci_airq.lsi_ptr = 1; 531 532 rc = -ENOMEM; 533 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC); 534 if (!zpci_aisb_iv) 535 goto out_airq; 536 537 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); 538 return 0; 539 540 out_airq: 541 unregister_adapter_interrupt(&zpci_airq); 542 out: 543 return rc; 544 } 545 546 static void zpci_irq_exit(void) 547 { 548 airq_iv_release(zpci_aisb_iv); 549 unregister_adapter_interrupt(&zpci_airq); 550 } 551 552 static int zpci_alloc_iomap(struct zpci_dev *zdev) 553 { 554 unsigned long entry; 555 556 spin_lock(&zpci_iomap_lock); 557 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES); 558 if (entry == ZPCI_IOMAP_ENTRIES) { 559 spin_unlock(&zpci_iomap_lock); 560 return -ENOSPC; 561 } 562 set_bit(entry, zpci_iomap_bitmap); 563 spin_unlock(&zpci_iomap_lock); 564 return entry; 565 } 566 567 static void zpci_free_iomap(struct zpci_dev *zdev, int entry) 568 { 569 spin_lock(&zpci_iomap_lock); 570 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry)); 571 clear_bit(entry, zpci_iomap_bitmap); 572 spin_unlock(&zpci_iomap_lock); 573 } 574 575 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start, 576 unsigned long size, unsigned long flags) 577 { 578 struct resource *r; 579 580 r = kzalloc(sizeof(*r), GFP_KERNEL); 581 if (!r) 582 return NULL; 583 584 r->start = start; 585 r->end = r->start + size - 1; 586 r->flags = flags; 587 r->name = zdev->res_name; 588 589 if (request_resource(&iomem_resource, r)) { 590 kfree(r); 591 return NULL; 592 } 593 return r; 594 } 595 596 static int zpci_setup_bus_resources(struct zpci_dev *zdev, 597 struct list_head *resources) 598 { 599 unsigned long addr, size, flags; 600 struct resource *res; 601 int i, entry; 602 603 snprintf(zdev->res_name, sizeof(zdev->res_name), 604 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR); 605 606 for (i = 0; i < PCI_BAR_COUNT; i++) { 607 if (!zdev->bars[i].size) 608 continue; 609 entry = zpci_alloc_iomap(zdev); 610 if (entry < 0) 611 return entry; 612 zdev->bars[i].map_idx = entry; 613 614 /* only MMIO is supported */ 615 flags = IORESOURCE_MEM; 616 if (zdev->bars[i].val & 8) 617 flags |= IORESOURCE_PREFETCH; 618 if (zdev->bars[i].val & 4) 619 flags |= IORESOURCE_MEM_64; 620 621 addr = ZPCI_ADDR(entry); 622 size = 1UL << zdev->bars[i].size; 623 624 res = __alloc_res(zdev, addr, size, flags); 625 if (!res) { 626 zpci_free_iomap(zdev, entry); 627 return -ENOMEM; 628 } 629 zdev->bars[i].res = res; 630 pci_add_resource(resources, res); 631 } 632 633 return 0; 634 } 635 636 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev) 637 { 638 int i; 639 640 for (i = 0; i < PCI_BAR_COUNT; i++) { 641 if (!zdev->bars[i].size || !zdev->bars[i].res) 642 continue; 643 644 zpci_free_iomap(zdev, zdev->bars[i].map_idx); 645 release_resource(zdev->bars[i].res); 646 kfree(zdev->bars[i].res); 647 } 648 } 649 650 int pcibios_add_device(struct pci_dev *pdev) 651 { 652 struct resource *res; 653 int i; 654 655 pdev->dev.groups = zpci_attr_groups; 656 pdev->dev.dma_ops = &s390_pci_dma_ops; 657 zpci_map_resources(pdev); 658 659 for (i = 0; i < PCI_BAR_COUNT; i++) { 660 res = &pdev->resource[i]; 661 if (res->parent || !res->flags) 662 continue; 663 pci_claim_resource(pdev, i); 664 } 665 666 return 0; 667 } 668 669 void pcibios_release_device(struct pci_dev *pdev) 670 { 671 zpci_unmap_resources(pdev); 672 } 673 674 int pcibios_enable_device(struct pci_dev *pdev, int mask) 675 { 676 struct zpci_dev *zdev = to_zpci(pdev); 677 678 zpci_debug_init_device(zdev, dev_name(&pdev->dev)); 679 zpci_fmb_enable_device(zdev); 680 681 return pci_enable_resources(pdev, mask); 682 } 683 684 void pcibios_disable_device(struct pci_dev *pdev) 685 { 686 struct zpci_dev *zdev = to_zpci(pdev); 687 688 zpci_fmb_disable_device(zdev); 689 zpci_debug_exit_device(zdev); 690 } 691 692 #ifdef CONFIG_HIBERNATE_CALLBACKS 693 static int zpci_restore(struct device *dev) 694 { 695 struct pci_dev *pdev = to_pci_dev(dev); 696 struct zpci_dev *zdev = to_zpci(pdev); 697 int ret = 0; 698 699 if (zdev->state != ZPCI_FN_STATE_ONLINE) 700 goto out; 701 702 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 703 if (ret) 704 goto out; 705 706 zpci_map_resources(pdev); 707 zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma, 708 (u64) zdev->dma_table); 709 710 out: 711 return ret; 712 } 713 714 static int zpci_freeze(struct device *dev) 715 { 716 struct pci_dev *pdev = to_pci_dev(dev); 717 struct zpci_dev *zdev = to_zpci(pdev); 718 719 if (zdev->state != ZPCI_FN_STATE_ONLINE) 720 return 0; 721 722 zpci_unregister_ioat(zdev, 0); 723 zpci_unmap_resources(pdev); 724 return clp_disable_fh(zdev); 725 } 726 727 struct dev_pm_ops pcibios_pm_ops = { 728 .thaw_noirq = zpci_restore, 729 .freeze_noirq = zpci_freeze, 730 .restore_noirq = zpci_restore, 731 .poweroff_noirq = zpci_freeze, 732 }; 733 #endif /* CONFIG_HIBERNATE_CALLBACKS */ 734 735 static int zpci_alloc_domain(struct zpci_dev *zdev) 736 { 737 if (zpci_unique_uid) { 738 zdev->domain = (u16) zdev->uid; 739 if (zdev->domain >= ZPCI_NR_DEVICES) 740 return 0; 741 742 spin_lock(&zpci_domain_lock); 743 if (test_bit(zdev->domain, zpci_domain)) { 744 spin_unlock(&zpci_domain_lock); 745 return -EEXIST; 746 } 747 set_bit(zdev->domain, zpci_domain); 748 spin_unlock(&zpci_domain_lock); 749 return 0; 750 } 751 752 spin_lock(&zpci_domain_lock); 753 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES); 754 if (zdev->domain == ZPCI_NR_DEVICES) { 755 spin_unlock(&zpci_domain_lock); 756 return -ENOSPC; 757 } 758 set_bit(zdev->domain, zpci_domain); 759 spin_unlock(&zpci_domain_lock); 760 return 0; 761 } 762 763 static void zpci_free_domain(struct zpci_dev *zdev) 764 { 765 if (zdev->domain >= ZPCI_NR_DEVICES) 766 return; 767 768 spin_lock(&zpci_domain_lock); 769 clear_bit(zdev->domain, zpci_domain); 770 spin_unlock(&zpci_domain_lock); 771 } 772 773 void pcibios_remove_bus(struct pci_bus *bus) 774 { 775 struct zpci_dev *zdev = get_zdev_by_bus(bus); 776 777 zpci_exit_slot(zdev); 778 zpci_cleanup_bus_resources(zdev); 779 zpci_free_domain(zdev); 780 781 spin_lock(&zpci_list_lock); 782 list_del(&zdev->entry); 783 spin_unlock(&zpci_list_lock); 784 785 zpci_dbg(3, "rem fid:%x\n", zdev->fid); 786 kfree(zdev); 787 } 788 789 static int zpci_scan_bus(struct zpci_dev *zdev) 790 { 791 LIST_HEAD(resources); 792 int ret; 793 794 ret = zpci_setup_bus_resources(zdev, &resources); 795 if (ret) 796 goto error; 797 798 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops, 799 zdev, &resources); 800 if (!zdev->bus) { 801 ret = -EIO; 802 goto error; 803 } 804 zdev->bus->max_bus_speed = zdev->max_bus_speed; 805 pci_bus_add_devices(zdev->bus); 806 return 0; 807 808 error: 809 zpci_cleanup_bus_resources(zdev); 810 pci_free_resource_list(&resources); 811 return ret; 812 } 813 814 int zpci_enable_device(struct zpci_dev *zdev) 815 { 816 int rc; 817 818 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES); 819 if (rc) 820 goto out; 821 822 rc = zpci_dma_init_device(zdev); 823 if (rc) 824 goto out_dma; 825 826 zdev->state = ZPCI_FN_STATE_ONLINE; 827 return 0; 828 829 out_dma: 830 clp_disable_fh(zdev); 831 out: 832 return rc; 833 } 834 EXPORT_SYMBOL_GPL(zpci_enable_device); 835 836 int zpci_disable_device(struct zpci_dev *zdev) 837 { 838 zpci_dma_exit_device(zdev); 839 return clp_disable_fh(zdev); 840 } 841 EXPORT_SYMBOL_GPL(zpci_disable_device); 842 843 int zpci_create_device(struct zpci_dev *zdev) 844 { 845 int rc; 846 847 rc = zpci_alloc_domain(zdev); 848 if (rc) 849 goto out; 850 851 mutex_init(&zdev->lock); 852 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) { 853 rc = zpci_enable_device(zdev); 854 if (rc) 855 goto out_free; 856 } 857 rc = zpci_scan_bus(zdev); 858 if (rc) 859 goto out_disable; 860 861 spin_lock(&zpci_list_lock); 862 list_add_tail(&zdev->entry, &zpci_list); 863 spin_unlock(&zpci_list_lock); 864 865 zpci_init_slot(zdev); 866 867 return 0; 868 869 out_disable: 870 if (zdev->state == ZPCI_FN_STATE_ONLINE) 871 zpci_disable_device(zdev); 872 out_free: 873 zpci_free_domain(zdev); 874 out: 875 return rc; 876 } 877 878 void zpci_remove_device(struct zpci_dev *zdev) 879 { 880 if (!zdev->bus) 881 return; 882 883 pci_stop_root_bus(zdev->bus); 884 pci_remove_root_bus(zdev->bus); 885 } 886 887 int zpci_report_error(struct pci_dev *pdev, 888 struct zpci_report_error_header *report) 889 { 890 struct zpci_dev *zdev = to_zpci(pdev); 891 892 return sclp_pci_report(report, zdev->fh, zdev->fid); 893 } 894 EXPORT_SYMBOL(zpci_report_error); 895 896 static int zpci_mem_init(void) 897 { 898 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) || 899 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb)); 900 901 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb), 902 __alignof__(struct zpci_fmb), 0, NULL); 903 if (!zdev_fmb_cache) 904 goto error_fmb; 905 906 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES, 907 sizeof(*zpci_iomap_start), GFP_KERNEL); 908 if (!zpci_iomap_start) 909 goto error_iomap; 910 911 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES), 912 sizeof(*zpci_iomap_bitmap), GFP_KERNEL); 913 if (!zpci_iomap_bitmap) 914 goto error_iomap_bitmap; 915 916 return 0; 917 error_iomap_bitmap: 918 kfree(zpci_iomap_start); 919 error_iomap: 920 kmem_cache_destroy(zdev_fmb_cache); 921 error_fmb: 922 return -ENOMEM; 923 } 924 925 static void zpci_mem_exit(void) 926 { 927 kfree(zpci_iomap_bitmap); 928 kfree(zpci_iomap_start); 929 kmem_cache_destroy(zdev_fmb_cache); 930 } 931 932 static unsigned int s390_pci_probe = 1; 933 static unsigned int s390_pci_initialized; 934 935 char * __init pcibios_setup(char *str) 936 { 937 if (!strcmp(str, "off")) { 938 s390_pci_probe = 0; 939 return NULL; 940 } 941 return str; 942 } 943 944 bool zpci_is_enabled(void) 945 { 946 return s390_pci_initialized; 947 } 948 949 static int __init pci_base_init(void) 950 { 951 int rc; 952 953 if (!s390_pci_probe) 954 return 0; 955 956 if (!test_facility(69) || !test_facility(71) || !test_facility(72)) 957 return 0; 958 959 rc = zpci_debug_init(); 960 if (rc) 961 goto out; 962 963 rc = zpci_mem_init(); 964 if (rc) 965 goto out_mem; 966 967 rc = zpci_irq_init(); 968 if (rc) 969 goto out_irq; 970 971 rc = zpci_dma_init(); 972 if (rc) 973 goto out_dma; 974 975 rc = clp_scan_pci_devices(); 976 if (rc) 977 goto out_find; 978 979 s390_pci_initialized = 1; 980 return 0; 981 982 out_find: 983 zpci_dma_exit(); 984 out_dma: 985 zpci_irq_exit(); 986 out_irq: 987 zpci_mem_exit(); 988 out_mem: 989 zpci_debug_exit(); 990 out: 991 return rc; 992 } 993 subsys_initcall_sync(pci_base_init); 994 995 void zpci_rescan(void) 996 { 997 if (zpci_is_enabled()) 998 clp_rescan_pci_devices_simple(); 999 } 1000