linux/arch/s390/pci/pci.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright IBM Corp. 2012
   4 *
   5 * Author(s):
   6 *   Jan Glauber <jang@linux.vnet.ibm.com>
   7 *
   8 * The System z PCI code is a rewrite from a prototype by
   9 * the following people (Kudoz!):
  10 *   Alexander Schmidt
  11 *   Christoph Raisch
  12 *   Hannes Hering
  13 *   Hoang-Nam Nguyen
  14 *   Jan-Bernd Themann
  15 *   Stefan Roscher
  16 *   Thomas Klein
  17 */
  18
  19#define KMSG_COMPONENT "zpci"
  20#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  21
  22#include <linux/kernel.h>
  23#include <linux/slab.h>
  24#include <linux/err.h>
  25#include <linux/export.h>
  26#include <linux/delay.h>
  27#include <linux/seq_file.h>
  28#include <linux/jump_label.h>
  29#include <linux/pci.h>
  30#include <linux/printk.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#include "pci_bus.h"
  40#include "pci_iov.h"
  41
  42/* list of all detected zpci devices */
  43static LIST_HEAD(zpci_list);
  44static DEFINE_SPINLOCK(zpci_list_lock);
  45
  46static DECLARE_BITMAP(zpci_domain, ZPCI_DOMAIN_BITMAP_SIZE);
  47static DEFINE_SPINLOCK(zpci_domain_lock);
  48
  49#define ZPCI_IOMAP_ENTRIES                                              \
  50        min(((unsigned long) ZPCI_NR_DEVICES * PCI_STD_NUM_BARS / 2),   \
  51            ZPCI_IOMAP_MAX_ENTRIES)
  52
  53unsigned int s390_pci_no_rid;
  54
  55static DEFINE_SPINLOCK(zpci_iomap_lock);
  56static unsigned long *zpci_iomap_bitmap;
  57struct zpci_iomap_entry *zpci_iomap_start;
  58EXPORT_SYMBOL_GPL(zpci_iomap_start);
  59
  60DEFINE_STATIC_KEY_FALSE(have_mio);
  61
  62static struct kmem_cache *zdev_fmb_cache;
  63
  64struct zpci_dev *get_zdev_by_fid(u32 fid)
  65{
  66        struct zpci_dev *tmp, *zdev = NULL;
  67
  68        spin_lock(&zpci_list_lock);
  69        list_for_each_entry(tmp, &zpci_list, entry) {
  70                if (tmp->fid == fid) {
  71                        zdev = tmp;
  72                        break;
  73                }
  74        }
  75        spin_unlock(&zpci_list_lock);
  76        return zdev;
  77}
  78
  79void zpci_remove_reserved_devices(void)
  80{
  81        struct zpci_dev *tmp, *zdev;
  82        enum zpci_state state;
  83        LIST_HEAD(remove);
  84
  85        spin_lock(&zpci_list_lock);
  86        list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
  87                if (zdev->state == ZPCI_FN_STATE_STANDBY &&
  88                    !clp_get_state(zdev->fid, &state) &&
  89                    state == ZPCI_FN_STATE_RESERVED)
  90                        list_move_tail(&zdev->entry, &remove);
  91        }
  92        spin_unlock(&zpci_list_lock);
  93
  94        list_for_each_entry_safe(zdev, tmp, &remove, entry)
  95                zpci_zdev_put(zdev);
  96}
  97
  98int pci_domain_nr(struct pci_bus *bus)
  99{
 100        return ((struct zpci_bus *) bus->sysdata)->domain_nr;
 101}
 102EXPORT_SYMBOL_GPL(pci_domain_nr);
 103
 104int pci_proc_domain(struct pci_bus *bus)
 105{
 106        return pci_domain_nr(bus);
 107}
 108EXPORT_SYMBOL_GPL(pci_proc_domain);
 109
 110/* Modify PCI: Register I/O address translation parameters */
 111int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
 112                       u64 base, u64 limit, u64 iota)
 113{
 114        u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
 115        struct zpci_fib fib = {0};
 116        u8 status;
 117
 118        WARN_ON_ONCE(iota & 0x3fff);
 119        fib.pba = base;
 120        fib.pal = limit;
 121        fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
 122        return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
 123}
 124
 125/* Modify PCI: Unregister I/O address translation parameters */
 126int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
 127{
 128        u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
 129        struct zpci_fib fib = {0};
 130        u8 cc, status;
 131
 132        cc = zpci_mod_fc(req, &fib, &status);
 133        if (cc == 3) /* Function already gone. */
 134                cc = 0;
 135        return cc ? -EIO : 0;
 136}
 137
 138/* Modify PCI: Set PCI function measurement parameters */
 139int zpci_fmb_enable_device(struct zpci_dev *zdev)
 140{
 141        u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
 142        struct zpci_fib fib = {0};
 143        u8 cc, status;
 144
 145        if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
 146                return -EINVAL;
 147
 148        zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
 149        if (!zdev->fmb)
 150                return -ENOMEM;
 151        WARN_ON((u64) zdev->fmb & 0xf);
 152
 153        /* reset software counters */
 154        atomic64_set(&zdev->allocated_pages, 0);
 155        atomic64_set(&zdev->mapped_pages, 0);
 156        atomic64_set(&zdev->unmapped_pages, 0);
 157
 158        fib.fmb_addr = virt_to_phys(zdev->fmb);
 159        cc = zpci_mod_fc(req, &fib, &status);
 160        if (cc) {
 161                kmem_cache_free(zdev_fmb_cache, zdev->fmb);
 162                zdev->fmb = NULL;
 163        }
 164        return cc ? -EIO : 0;
 165}
 166
 167/* Modify PCI: Disable PCI function measurement */
 168int zpci_fmb_disable_device(struct zpci_dev *zdev)
 169{
 170        u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
 171        struct zpci_fib fib = {0};
 172        u8 cc, status;
 173
 174        if (!zdev->fmb)
 175                return -EINVAL;
 176
 177        /* Function measurement is disabled if fmb address is zero */
 178        cc = zpci_mod_fc(req, &fib, &status);
 179        if (cc == 3) /* Function already gone. */
 180                cc = 0;
 181
 182        if (!cc) {
 183                kmem_cache_free(zdev_fmb_cache, zdev->fmb);
 184                zdev->fmb = NULL;
 185        }
 186        return cc ? -EIO : 0;
 187}
 188
 189static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
 190{
 191        u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
 192        u64 data;
 193        int rc;
 194
 195        rc = __zpci_load(&data, req, offset);
 196        if (!rc) {
 197                data = le64_to_cpu((__force __le64) data);
 198                data >>= (8 - len) * 8;
 199                *val = (u32) data;
 200        } else
 201                *val = 0xffffffff;
 202        return rc;
 203}
 204
 205static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
 206{
 207        u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
 208        u64 data = val;
 209        int rc;
 210
 211        data <<= (8 - len) * 8;
 212        data = (__force u64) cpu_to_le64(data);
 213        rc = __zpci_store(data, req, offset);
 214        return rc;
 215}
 216
 217resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 218                                       resource_size_t size,
 219                                       resource_size_t align)
 220{
 221        return 0;
 222}
 223
 224/* combine single writes by using store-block insn */
 225void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
 226{
 227       zpci_memcpy_toio(to, from, count);
 228}
 229
 230static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot)
 231{
 232        unsigned long offset, vaddr;
 233        struct vm_struct *area;
 234        phys_addr_t last_addr;
 235
 236        last_addr = addr + size - 1;
 237        if (!size || last_addr < addr)
 238                return NULL;
 239
 240        if (!static_branch_unlikely(&have_mio))
 241                return (void __iomem *) addr;
 242
 243        offset = addr & ~PAGE_MASK;
 244        addr &= PAGE_MASK;
 245        size = PAGE_ALIGN(size + offset);
 246        area = get_vm_area(size, VM_IOREMAP);
 247        if (!area)
 248                return NULL;
 249
 250        vaddr = (unsigned long) area->addr;
 251        if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
 252                free_vm_area(area);
 253                return NULL;
 254        }
 255        return (void __iomem *) ((unsigned long) area->addr + offset);
 256}
 257
 258void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
 259{
 260        return __ioremap(addr, size, __pgprot(prot));
 261}
 262EXPORT_SYMBOL(ioremap_prot);
 263
 264void __iomem *ioremap(phys_addr_t addr, size_t size)
 265{
 266        return __ioremap(addr, size, PAGE_KERNEL);
 267}
 268EXPORT_SYMBOL(ioremap);
 269
 270void __iomem *ioremap_wc(phys_addr_t addr, size_t size)
 271{
 272        return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL));
 273}
 274EXPORT_SYMBOL(ioremap_wc);
 275
 276void __iomem *ioremap_wt(phys_addr_t addr, size_t size)
 277{
 278        return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL));
 279}
 280EXPORT_SYMBOL(ioremap_wt);
 281
 282void iounmap(volatile void __iomem *addr)
 283{
 284        if (static_branch_likely(&have_mio))
 285                vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
 286}
 287EXPORT_SYMBOL(iounmap);
 288
 289/* Create a virtual mapping cookie for a PCI BAR */
 290static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
 291                                        unsigned long offset, unsigned long max)
 292{
 293        struct zpci_dev *zdev = to_zpci(pdev);
 294        int idx;
 295
 296        idx = zdev->bars[bar].map_idx;
 297        spin_lock(&zpci_iomap_lock);
 298        /* Detect overrun */
 299        WARN_ON(!++zpci_iomap_start[idx].count);
 300        zpci_iomap_start[idx].fh = zdev->fh;
 301        zpci_iomap_start[idx].bar = bar;
 302        spin_unlock(&zpci_iomap_lock);
 303
 304        return (void __iomem *) ZPCI_ADDR(idx) + offset;
 305}
 306
 307static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
 308                                         unsigned long offset,
 309                                         unsigned long max)
 310{
 311        unsigned long barsize = pci_resource_len(pdev, bar);
 312        struct zpci_dev *zdev = to_zpci(pdev);
 313        void __iomem *iova;
 314
 315        iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
 316        return iova ? iova + offset : iova;
 317}
 318
 319void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
 320                              unsigned long offset, unsigned long max)
 321{
 322        if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
 323                return NULL;
 324
 325        if (static_branch_likely(&have_mio))
 326                return pci_iomap_range_mio(pdev, bar, offset, max);
 327        else
 328                return pci_iomap_range_fh(pdev, bar, offset, max);
 329}
 330EXPORT_SYMBOL(pci_iomap_range);
 331
 332void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
 333{
 334        return pci_iomap_range(dev, bar, 0, maxlen);
 335}
 336EXPORT_SYMBOL(pci_iomap);
 337
 338static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
 339                                            unsigned long offset, unsigned long max)
 340{
 341        unsigned long barsize = pci_resource_len(pdev, bar);
 342        struct zpci_dev *zdev = to_zpci(pdev);
 343        void __iomem *iova;
 344
 345        iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
 346        return iova ? iova + offset : iova;
 347}
 348
 349void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
 350                                 unsigned long offset, unsigned long max)
 351{
 352        if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
 353                return NULL;
 354
 355        if (static_branch_likely(&have_mio))
 356                return pci_iomap_wc_range_mio(pdev, bar, offset, max);
 357        else
 358                return pci_iomap_range_fh(pdev, bar, offset, max);
 359}
 360EXPORT_SYMBOL(pci_iomap_wc_range);
 361
 362void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
 363{
 364        return pci_iomap_wc_range(dev, bar, 0, maxlen);
 365}
 366EXPORT_SYMBOL(pci_iomap_wc);
 367
 368static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
 369{
 370        unsigned int idx = ZPCI_IDX(addr);
 371
 372        spin_lock(&zpci_iomap_lock);
 373        /* Detect underrun */
 374        WARN_ON(!zpci_iomap_start[idx].count);
 375        if (!--zpci_iomap_start[idx].count) {
 376                zpci_iomap_start[idx].fh = 0;
 377                zpci_iomap_start[idx].bar = 0;
 378        }
 379        spin_unlock(&zpci_iomap_lock);
 380}
 381
 382static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
 383{
 384        iounmap(addr);
 385}
 386
 387void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
 388{
 389        if (static_branch_likely(&have_mio))
 390                pci_iounmap_mio(pdev, addr);
 391        else
 392                pci_iounmap_fh(pdev, addr);
 393}
 394EXPORT_SYMBOL(pci_iounmap);
 395
 396static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
 397                    int size, u32 *val)
 398{
 399        struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
 400
 401        return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV;
 402}
 403
 404static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
 405                     int size, u32 val)
 406{
 407        struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
 408
 409        return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV;
 410}
 411
 412static struct pci_ops pci_root_ops = {
 413        .read = pci_read,
 414        .write = pci_write,
 415};
 416
 417static void zpci_map_resources(struct pci_dev *pdev)
 418{
 419        struct zpci_dev *zdev = to_zpci(pdev);
 420        resource_size_t len;
 421        int i;
 422
 423        for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 424                len = pci_resource_len(pdev, i);
 425                if (!len)
 426                        continue;
 427
 428                if (zpci_use_mio(zdev))
 429                        pdev->resource[i].start =
 430                                (resource_size_t __force) zdev->bars[i].mio_wt;
 431                else
 432                        pdev->resource[i].start = (resource_size_t __force)
 433                                pci_iomap_range_fh(pdev, i, 0, 0);
 434                pdev->resource[i].end = pdev->resource[i].start + len - 1;
 435        }
 436
 437        zpci_iov_map_resources(pdev);
 438}
 439
 440static void zpci_unmap_resources(struct pci_dev *pdev)
 441{
 442        struct zpci_dev *zdev = to_zpci(pdev);
 443        resource_size_t len;
 444        int i;
 445
 446        if (zpci_use_mio(zdev))
 447                return;
 448
 449        for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 450                len = pci_resource_len(pdev, i);
 451                if (!len)
 452                        continue;
 453                pci_iounmap_fh(pdev, (void __iomem __force *)
 454                               pdev->resource[i].start);
 455        }
 456}
 457
 458static int zpci_alloc_iomap(struct zpci_dev *zdev)
 459{
 460        unsigned long entry;
 461
 462        spin_lock(&zpci_iomap_lock);
 463        entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
 464        if (entry == ZPCI_IOMAP_ENTRIES) {
 465                spin_unlock(&zpci_iomap_lock);
 466                return -ENOSPC;
 467        }
 468        set_bit(entry, zpci_iomap_bitmap);
 469        spin_unlock(&zpci_iomap_lock);
 470        return entry;
 471}
 472
 473static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
 474{
 475        spin_lock(&zpci_iomap_lock);
 476        memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
 477        clear_bit(entry, zpci_iomap_bitmap);
 478        spin_unlock(&zpci_iomap_lock);
 479}
 480
 481static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
 482                                    unsigned long size, unsigned long flags)
 483{
 484        struct resource *r;
 485
 486        r = kzalloc(sizeof(*r), GFP_KERNEL);
 487        if (!r)
 488                return NULL;
 489
 490        r->start = start;
 491        r->end = r->start + size - 1;
 492        r->flags = flags;
 493        r->name = zdev->res_name;
 494
 495        if (request_resource(&iomem_resource, r)) {
 496                kfree(r);
 497                return NULL;
 498        }
 499        return r;
 500}
 501
 502int zpci_setup_bus_resources(struct zpci_dev *zdev,
 503                             struct list_head *resources)
 504{
 505        unsigned long addr, size, flags;
 506        struct resource *res;
 507        int i, entry;
 508
 509        snprintf(zdev->res_name, sizeof(zdev->res_name),
 510                 "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
 511
 512        for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 513                if (!zdev->bars[i].size)
 514                        continue;
 515                entry = zpci_alloc_iomap(zdev);
 516                if (entry < 0)
 517                        return entry;
 518                zdev->bars[i].map_idx = entry;
 519
 520                /* only MMIO is supported */
 521                flags = IORESOURCE_MEM;
 522                if (zdev->bars[i].val & 8)
 523                        flags |= IORESOURCE_PREFETCH;
 524                if (zdev->bars[i].val & 4)
 525                        flags |= IORESOURCE_MEM_64;
 526
 527                if (zpci_use_mio(zdev))
 528                        addr = (unsigned long) zdev->bars[i].mio_wt;
 529                else
 530                        addr = ZPCI_ADDR(entry);
 531                size = 1UL << zdev->bars[i].size;
 532
 533                res = __alloc_res(zdev, addr, size, flags);
 534                if (!res) {
 535                        zpci_free_iomap(zdev, entry);
 536                        return -ENOMEM;
 537                }
 538                zdev->bars[i].res = res;
 539                pci_add_resource(resources, res);
 540        }
 541        zdev->has_resources = 1;
 542
 543        return 0;
 544}
 545
 546static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
 547{
 548        int i;
 549
 550        for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 551                if (!zdev->bars[i].size || !zdev->bars[i].res)
 552                        continue;
 553
 554                zpci_free_iomap(zdev, zdev->bars[i].map_idx);
 555                release_resource(zdev->bars[i].res);
 556                kfree(zdev->bars[i].res);
 557        }
 558        zdev->has_resources = 0;
 559}
 560
 561int pcibios_add_device(struct pci_dev *pdev)
 562{
 563        struct zpci_dev *zdev = to_zpci(pdev);
 564        struct resource *res;
 565        int i;
 566
 567        /* The pdev has a reference to the zdev via its bus */
 568        zpci_zdev_get(zdev);
 569        if (pdev->is_physfn)
 570                pdev->no_vf_scan = 1;
 571
 572        pdev->dev.groups = zpci_attr_groups;
 573        pdev->dev.dma_ops = &s390_pci_dma_ops;
 574        zpci_map_resources(pdev);
 575
 576        for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 577                res = &pdev->resource[i];
 578                if (res->parent || !res->flags)
 579                        continue;
 580                pci_claim_resource(pdev, i);
 581        }
 582
 583        return 0;
 584}
 585
 586void pcibios_release_device(struct pci_dev *pdev)
 587{
 588        struct zpci_dev *zdev = to_zpci(pdev);
 589
 590        zpci_unmap_resources(pdev);
 591        zpci_zdev_put(zdev);
 592}
 593
 594int pcibios_enable_device(struct pci_dev *pdev, int mask)
 595{
 596        struct zpci_dev *zdev = to_zpci(pdev);
 597
 598        zpci_debug_init_device(zdev, dev_name(&pdev->dev));
 599        zpci_fmb_enable_device(zdev);
 600
 601        return pci_enable_resources(pdev, mask);
 602}
 603
 604void pcibios_disable_device(struct pci_dev *pdev)
 605{
 606        struct zpci_dev *zdev = to_zpci(pdev);
 607
 608        zpci_fmb_disable_device(zdev);
 609        zpci_debug_exit_device(zdev);
 610}
 611
 612static int __zpci_register_domain(int domain)
 613{
 614        spin_lock(&zpci_domain_lock);
 615        if (test_bit(domain, zpci_domain)) {
 616                spin_unlock(&zpci_domain_lock);
 617                pr_err("Domain %04x is already assigned\n", domain);
 618                return -EEXIST;
 619        }
 620        set_bit(domain, zpci_domain);
 621        spin_unlock(&zpci_domain_lock);
 622        return domain;
 623}
 624
 625static int __zpci_alloc_domain(void)
 626{
 627        int domain;
 628
 629        spin_lock(&zpci_domain_lock);
 630        /*
 631         * We can always auto allocate domains below ZPCI_NR_DEVICES.
 632         * There is either a free domain or we have reached the maximum in
 633         * which case we would have bailed earlier.
 634         */
 635        domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
 636        set_bit(domain, zpci_domain);
 637        spin_unlock(&zpci_domain_lock);
 638        return domain;
 639}
 640
 641int zpci_alloc_domain(int domain)
 642{
 643        if (zpci_unique_uid) {
 644                if (domain)
 645                        return __zpci_register_domain(domain);
 646                pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
 647                update_uid_checking(false);
 648        }
 649        return __zpci_alloc_domain();
 650}
 651
 652void zpci_free_domain(int domain)
 653{
 654        spin_lock(&zpci_domain_lock);
 655        clear_bit(domain, zpci_domain);
 656        spin_unlock(&zpci_domain_lock);
 657}
 658
 659
 660int zpci_enable_device(struct zpci_dev *zdev)
 661{
 662        int rc;
 663
 664        rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
 665        if (rc)
 666                goto out;
 667
 668        rc = zpci_dma_init_device(zdev);
 669        if (rc)
 670                goto out_dma;
 671
 672        return 0;
 673
 674out_dma:
 675        clp_disable_fh(zdev);
 676out:
 677        return rc;
 678}
 679
 680int zpci_disable_device(struct zpci_dev *zdev)
 681{
 682        zpci_dma_exit_device(zdev);
 683        /*
 684         * The zPCI function may already be disabled by the platform, this is
 685         * detected in clp_disable_fh() which becomes a no-op.
 686         */
 687        return clp_disable_fh(zdev);
 688}
 689
 690/**
 691 * zpci_create_device() - Create a new zpci_dev and add it to the zbus
 692 * @fid: Function ID of the device to be created
 693 * @fh: Current Function Handle of the device to be created
 694 * @state: Initial state after creation either Standby or Configured
 695 *
 696 * Creates a new zpci device and adds it to its, possibly newly created, zbus
 697 * as well as zpci_list.
 698 *
 699 * Returns: the zdev on success or an error pointer otherwise
 700 */
 701struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
 702{
 703        struct zpci_dev *zdev;
 704        int rc;
 705
 706        zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, state);
 707        zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
 708        if (!zdev)
 709                return ERR_PTR(-ENOMEM);
 710
 711        /* FID and Function Handle are the static/dynamic identifiers */
 712        zdev->fid = fid;
 713        zdev->fh = fh;
 714
 715        /* Query function properties and update zdev */
 716        rc = clp_query_pci_fn(zdev);
 717        if (rc)
 718                goto error;
 719        zdev->state =  state;
 720
 721        kref_init(&zdev->kref);
 722        mutex_init(&zdev->lock);
 723
 724        rc = zpci_init_iommu(zdev);
 725        if (rc)
 726                goto error;
 727
 728        rc = zpci_bus_device_register(zdev, &pci_root_ops);
 729        if (rc)
 730                goto error_destroy_iommu;
 731
 732        spin_lock(&zpci_list_lock);
 733        list_add_tail(&zdev->entry, &zpci_list);
 734        spin_unlock(&zpci_list_lock);
 735
 736        return zdev;
 737
 738error_destroy_iommu:
 739        zpci_destroy_iommu(zdev);
 740error:
 741        zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
 742        kfree(zdev);
 743        return ERR_PTR(rc);
 744}
 745
 746/**
 747 * zpci_scan_configured_device() - Scan a freshly configured zpci_dev
 748 * @zdev: The zpci_dev to be configured
 749 * @fh: The general function handle supplied by the platform
 750 *
 751 * Given a device in the configuration state Configured, enables, scans and
 752 * adds it to the common code PCI subsystem if possible. If the PCI device is
 753 * parked because we can not yet create a PCI bus because we have not seen
 754 * function 0, it is ignored but will be scanned once function 0 appears.
 755 * If any failure occurs, the zpci_dev is left disabled.
 756 *
 757 * Return: 0 on success, or an error code otherwise
 758 */
 759int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh)
 760{
 761        int rc;
 762
 763        zdev->fh = fh;
 764        /* the PCI function will be scanned once function 0 appears */
 765        if (!zdev->zbus->bus)
 766                return 0;
 767
 768        /* For function 0 on a multi-function bus scan whole bus as we might
 769         * have to pick up existing functions waiting for it to allow creating
 770         * the PCI bus
 771         */
 772        if (zdev->devfn == 0 && zdev->zbus->multifunction)
 773                rc = zpci_bus_scan_bus(zdev->zbus);
 774        else
 775                rc = zpci_bus_scan_device(zdev);
 776
 777        return rc;
 778}
 779
 780/**
 781 * zpci_deconfigure_device() - Deconfigure a zpci_dev
 782 * @zdev: The zpci_dev to configure
 783 *
 784 * Deconfigure a zPCI function that is currently configured and possibly known
 785 * to the common code PCI subsystem.
 786 * If any failure occurs the device is left as is.
 787 *
 788 * Return: 0 on success, or an error code otherwise
 789 */
 790int zpci_deconfigure_device(struct zpci_dev *zdev)
 791{
 792        int rc;
 793
 794        if (zdev->zbus->bus)
 795                zpci_bus_remove_device(zdev, false);
 796
 797        if (zdev_enabled(zdev)) {
 798                rc = zpci_disable_device(zdev);
 799                if (rc)
 800                        return rc;
 801        }
 802
 803        rc = sclp_pci_deconfigure(zdev->fid);
 804        zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, rc);
 805        if (rc)
 806                return rc;
 807        zdev->state = ZPCI_FN_STATE_STANDBY;
 808
 809        return 0;
 810}
 811
 812void zpci_release_device(struct kref *kref)
 813{
 814        struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
 815        int ret;
 816
 817        if (zdev->zbus->bus)
 818                zpci_bus_remove_device(zdev, false);
 819
 820        if (zdev_enabled(zdev))
 821                zpci_disable_device(zdev);
 822
 823        switch (zdev->state) {
 824        case ZPCI_FN_STATE_CONFIGURED:
 825                ret = sclp_pci_deconfigure(zdev->fid);
 826                zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
 827                fallthrough;
 828        case ZPCI_FN_STATE_STANDBY:
 829                if (zdev->has_hp_slot)
 830                        zpci_exit_slot(zdev);
 831                zpci_cleanup_bus_resources(zdev);
 832                zpci_bus_device_unregister(zdev);
 833                zpci_destroy_iommu(zdev);
 834                fallthrough;
 835        default:
 836                break;
 837        }
 838
 839        spin_lock(&zpci_list_lock);
 840        list_del(&zdev->entry);
 841        spin_unlock(&zpci_list_lock);
 842        zpci_dbg(3, "rem fid:%x\n", zdev->fid);
 843        kfree(zdev);
 844}
 845
 846int zpci_report_error(struct pci_dev *pdev,
 847                      struct zpci_report_error_header *report)
 848{
 849        struct zpci_dev *zdev = to_zpci(pdev);
 850
 851        return sclp_pci_report(report, zdev->fh, zdev->fid);
 852}
 853EXPORT_SYMBOL(zpci_report_error);
 854
 855static int zpci_mem_init(void)
 856{
 857        BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
 858                     __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
 859
 860        zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
 861                                           __alignof__(struct zpci_fmb), 0, NULL);
 862        if (!zdev_fmb_cache)
 863                goto error_fmb;
 864
 865        zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
 866                                   sizeof(*zpci_iomap_start), GFP_KERNEL);
 867        if (!zpci_iomap_start)
 868                goto error_iomap;
 869
 870        zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
 871                                    sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
 872        if (!zpci_iomap_bitmap)
 873                goto error_iomap_bitmap;
 874
 875        if (static_branch_likely(&have_mio))
 876                clp_setup_writeback_mio();
 877
 878        return 0;
 879error_iomap_bitmap:
 880        kfree(zpci_iomap_start);
 881error_iomap:
 882        kmem_cache_destroy(zdev_fmb_cache);
 883error_fmb:
 884        return -ENOMEM;
 885}
 886
 887static void zpci_mem_exit(void)
 888{
 889        kfree(zpci_iomap_bitmap);
 890        kfree(zpci_iomap_start);
 891        kmem_cache_destroy(zdev_fmb_cache);
 892}
 893
 894static unsigned int s390_pci_probe __initdata = 1;
 895static unsigned int s390_pci_no_mio __initdata;
 896unsigned int s390_pci_force_floating __initdata;
 897static unsigned int s390_pci_initialized;
 898
 899char * __init pcibios_setup(char *str)
 900{
 901        if (!strcmp(str, "off")) {
 902                s390_pci_probe = 0;
 903                return NULL;
 904        }
 905        if (!strcmp(str, "nomio")) {
 906                s390_pci_no_mio = 1;
 907                return NULL;
 908        }
 909        if (!strcmp(str, "force_floating")) {
 910                s390_pci_force_floating = 1;
 911                return NULL;
 912        }
 913        if (!strcmp(str, "norid")) {
 914                s390_pci_no_rid = 1;
 915                return NULL;
 916        }
 917        return str;
 918}
 919
 920bool zpci_is_enabled(void)
 921{
 922        return s390_pci_initialized;
 923}
 924
 925static int __init pci_base_init(void)
 926{
 927        int rc;
 928
 929        if (!s390_pci_probe)
 930                return 0;
 931
 932        if (!test_facility(69) || !test_facility(71)) {
 933                pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n");
 934                return 0;
 935        }
 936
 937        if (test_facility(153) && !s390_pci_no_mio) {
 938                static_branch_enable(&have_mio);
 939                ctl_set_bit(2, 5);
 940        }
 941
 942        rc = zpci_debug_init();
 943        if (rc)
 944                goto out;
 945
 946        rc = zpci_mem_init();
 947        if (rc)
 948                goto out_mem;
 949
 950        rc = zpci_irq_init();
 951        if (rc)
 952                goto out_irq;
 953
 954        rc = zpci_dma_init();
 955        if (rc)
 956                goto out_dma;
 957
 958        rc = clp_scan_pci_devices();
 959        if (rc)
 960                goto out_find;
 961        zpci_bus_scan_busses();
 962
 963        s390_pci_initialized = 1;
 964        return 0;
 965
 966out_find:
 967        zpci_dma_exit();
 968out_dma:
 969        zpci_irq_exit();
 970out_irq:
 971        zpci_mem_exit();
 972out_mem:
 973        zpci_debug_exit();
 974out:
 975        return rc;
 976}
 977subsys_initcall_sync(pci_base_init);
 978