drivers/pci/hotplug/sgi_hotplug.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2005-2006 Silicon Graphics, Inc. All rights reserved.
   4  *
   5  * This work was based on the 2.4/2.6 kernel development by Dick Reigner.
   6  * Work to add BIOS PROM support was completed by Mike Habeck.
   7  */
   8
   9 #include <linux/acpi.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/pci.h>
  14 #include <linux/pci_hotplug.h>
  15 #include <linux/proc_fs.h>
  16 #include <linux/slab.h>
  17 #include <linux/types.h>
  18 #include <linux/mutex.h>
  19
  20 #include <asm/sn/addrs.h>
  21 #include <asm/sn/geo.h>
  22 #include <asm/sn/l1.h>
  23 #include <asm/sn/module.h>
  24 #include <asm/sn/pcibr_provider.h>
  25 #include <asm/sn/pcibus_provider_defs.h>
  26 #include <asm/sn/pcidev.h>
  27 #include <asm/sn/sn_feature_sets.h>
  28 #include <asm/sn/sn_sal.h>
  29 #include <asm/sn/types.h>
  30 #include <asm/sn/acpi.h>
  31
  32 #include "../pci.h"
  33
  34 MODULE_LICENSE("GPL");
  35 MODULE_AUTHOR("SGI (prarit@sgi.com, dickie@sgi.com, habeck@sgi.com)");
  36 MODULE_DESCRIPTION("SGI Altix Hot Plug PCI Controller Driver");
  37
  38
  39 /* SAL call error codes. Keep in sync with prom header io/include/pcibr.h */
  40 #define PCI_SLOT_ALREADY_UP             2       /* slot already up */
  41 #define PCI_SLOT_ALREADY_DOWN           3       /* slot already down */
  42 #define PCI_L1_ERR                      7       /* L1 console command error */
  43 #define PCI_EMPTY_33MHZ                 15      /* empty 33 MHz bus */
  44
  45
  46 #define PCIIO_ASIC_TYPE_TIOCA           4
  47 #define PCI_L1_QSIZE                    128     /* our L1 message buffer size */
  48 #define SN_MAX_HP_SLOTS                 32      /* max hotplug slots */
  49 #define SN_SLOT_NAME_SIZE               33      /* size of name string */
  50
  51 /* internal list head */
  52 static struct list_head sn_hp_list;
  53
  54 /* hotplug_slot struct's private pointer */
  55 struct slot {
  56         int device_num;
  57         struct pci_bus *pci_bus;
  58         /* this struct for glue internal only */
  59         struct hotplug_slot *hotplug_slot;
  60         struct list_head hp_list;
  61         char physical_path[SN_SLOT_NAME_SIZE];
  62 };
  63
  64 struct pcibr_slot_enable_resp {
  65         int resp_sub_errno;
  66         char resp_l1_msg[PCI_L1_QSIZE + 1];
  67 };
  68
  69 struct pcibr_slot_disable_resp {
  70         int resp_sub_errno;
  71         char resp_l1_msg[PCI_L1_QSIZE + 1];
  72 };
  73
  74 enum sn_pci_req_e {
  75         PCI_REQ_SLOT_ELIGIBLE,
  76         PCI_REQ_SLOT_DISABLE
  77 };
  78
  79 static int enable_slot(struct hotplug_slot *slot);
  80 static int disable_slot(struct hotplug_slot *slot);
  81 static inline int get_power_status(struct hotplug_slot *slot, u8 *value);
  82
  83 static struct hotplug_slot_ops sn_hotplug_slot_ops = {
  84         .enable_slot            = enable_slot,
  85         .disable_slot           = disable_slot,
  86         .get_power_status       = get_power_status,
  87 };
  88
  89 static DEFINE_MUTEX(sn_hotplug_mutex);
  90
  91 static ssize_t path_show(struct pci_slot *pci_slot, char *buf)
  92 {
  93         int retval = -ENOENT;
  94         struct slot *slot = pci_slot->hotplug->private;
  95
  96         if (!slot)
  97                 return retval;
  98
  99         retval = sprintf(buf, "%s\n", slot->physical_path);
 100         return retval;
 101 }
 102
 103 static struct pci_slot_attribute sn_slot_path_attr = __ATTR_RO(path);
 104
 105 static int sn_pci_slot_valid(struct pci_bus *pci_bus, int device)
 106 {
 107         struct pcibus_info *pcibus_info;
 108         u16 busnum, segment, ioboard_type;
 109
 110         pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
 111
 112         /* Check to see if this is a valid slot on 'pci_bus' */
 113         if (!(pcibus_info->pbi_valid_devices & (1 << device)))
 114                 return -EPERM;
 115
 116         ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
 117         busnum = pcibus_info->pbi_buscommon.bs_persist_busnum;
 118         segment = pci_domain_nr(pci_bus) & 0xf;
 119
 120         /* Do not allow hotplug operations on base I/O cards */
 121         if ((ioboard_type == L1_BRICKTYPE_IX ||
 122              ioboard_type == L1_BRICKTYPE_IA) &&
 123             (segment == 1 && busnum == 0 && device != 1))
 124                 return -EPERM;
 125
 126         return 1;
 127 }
 128
 129 static int sn_pci_bus_valid(struct pci_bus *pci_bus)
 130 {
 131         struct pcibus_info *pcibus_info;
 132         u32 asic_type;
 133         u16 ioboard_type;
 134
 135         /* Don't register slots hanging off the TIOCA bus */
 136         pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
 137         asic_type = pcibus_info->pbi_buscommon.bs_asic_type;
 138         if (asic_type == PCIIO_ASIC_TYPE_TIOCA)
 139                 return -EPERM;
 140
 141         /* Only register slots in I/O Bricks that support hotplug */
 142         ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
 143         switch (ioboard_type) {
 144                 case L1_BRICKTYPE_IX:
 145                 case L1_BRICKTYPE_PX:
 146                 case L1_BRICKTYPE_IA:
 147                 case L1_BRICKTYPE_PA:
 148                 case L1_BOARDTYPE_PCIX3SLOT:
 149                         return 1;
 150                         break;
 151                 default:
 152                         return -EPERM;
 153                         break;
 154         }
 155
 156         return -EIO;
 157 }
 158
 159 static int sn_hp_slot_private_alloc(struct hotplug_slot *bss_hotplug_slot,
 160                                     struct pci_bus *pci_bus, int device,
 161                                     char *name)
 162 {
 163         struct pcibus_info *pcibus_info;
 164         struct slot *slot;
 165
 166         pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
 167
 168         slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 169         if (!slot)
 170                 return -ENOMEM;
 171         bss_hotplug_slot->private = slot;
 172
 173         slot->device_num = device;
 174         slot->pci_bus = pci_bus;
 175         sprintf(name, "%04x:%02x:%02x",
 176                 pci_domain_nr(pci_bus),
 177                 ((u16)pcibus_info->pbi_buscommon.bs_persist_busnum),
 178                 device + 1);
 179
 180         sn_generate_path(pci_bus, slot->physical_path);
 181
 182         slot->hotplug_slot = bss_hotplug_slot;
 183         list_add(&slot->hp_list, &sn_hp_list);
 184
 185         return 0;
 186 }
 187
 188 static struct hotplug_slot *sn_hp_destroy(void)
 189 {
 190         struct slot *slot;
 191         struct pci_slot *pci_slot;
 192         struct hotplug_slot *bss_hotplug_slot = NULL;
 193
 194         list_for_each_entry(slot, &sn_hp_list, hp_list) {
 195                 bss_hotplug_slot = slot->hotplug_slot;
 196                 pci_slot = bss_hotplug_slot->pci_slot;
 197                 list_del(&((struct slot *)bss_hotplug_slot->private)->
 198                          hp_list);
 199                 sysfs_remove_file(&pci_slot->kobj,
 200                                   &sn_slot_path_attr.attr);
 201                 break;
 202         }
 203         return bss_hotplug_slot;
 204 }
 205
 206 static void sn_bus_free_data(struct pci_dev *dev)
 207 {
 208         struct pci_bus *subordinate_bus;
 209         struct pci_dev *child;
 210
 211         /* Recursively clean up sn_irq_info structs */
 212         if (dev->subordinate) {
 213                 subordinate_bus = dev->subordinate;
 214                 list_for_each_entry(child, &subordinate_bus->devices, bus_list)
 215                         sn_bus_free_data(child);
 216         }
 217         /*
 218          * Some drivers may use dma accesses during the
 219          * driver remove function. We release the sysdata
 220          * areas after the driver remove functions have
 221          * been called.
 222          */
 223         sn_bus_store_sysdata(dev);
 224         sn_pci_unfixup_slot(dev);
 225 }
 226
 227 static int sn_slot_enable(struct hotplug_slot *bss_hotplug_slot,
 228                           int device_num, char **ssdt)
 229 {
 230         struct slot *slot = bss_hotplug_slot->private;
 231         struct pcibus_info *pcibus_info;
 232         struct pcibr_slot_enable_resp resp;
 233         int rc;
 234
 235         pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
 236
 237         /*
 238          * Power-on and initialize the slot in the SN
 239          * PCI infrastructure.
 240          */
 241         rc = sal_pcibr_slot_enable(pcibus_info, device_num, &resp, ssdt);
 242
 243
 244         if (rc == PCI_SLOT_ALREADY_UP) {
 245                 pci_dbg(slot->pci_bus->self, "is already active\n");
 246                 return 1; /* return 1 to user */
 247         }
 248
 249         if (rc == PCI_L1_ERR) {
 250                 pci_dbg(slot->pci_bus->self, "L1 failure %d with message: %s",
 251                         resp.resp_sub_errno, resp.resp_l1_msg);
 252                 return -EPERM;
 253         }
 254
 255         if (rc) {
 256                 pci_dbg(slot->pci_bus->self, "insert failed with error %d sub-error %d\n",
 257                         rc, resp.resp_sub_errno);
 258                 return -EIO;
 259         }
 260
 261         pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
 262         pcibus_info->pbi_enabled_devices |= (1 << device_num);
 263
 264         return 0;
 265 }
 266
 267 static int sn_slot_disable(struct hotplug_slot *bss_hotplug_slot,
 268                            int device_num, int action)
 269 {
 270         struct slot *slot = bss_hotplug_slot->private;
 271         struct pcibus_info *pcibus_info;
 272         struct pcibr_slot_disable_resp resp;
 273         int rc;
 274
 275         pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
 276
 277         rc = sal_pcibr_slot_disable(pcibus_info, device_num, action, &resp);
 278
 279         if ((action == PCI_REQ_SLOT_ELIGIBLE) &&
 280             (rc == PCI_SLOT_ALREADY_DOWN)) {
 281                 pci_dbg(slot->pci_bus->self, "Slot %s already inactive\n", slot->physical_path);
 282                 return 1; /* return 1 to user */
 283         }
 284
 285         if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_EMPTY_33MHZ)) {
 286                 pci_dbg(slot->pci_bus->self, "Cannot remove last 33MHz card\n");
 287                 return -EPERM;
 288         }
 289
 290         if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_L1_ERR)) {
 291                 pci_dbg(slot->pci_bus->self, "L1 failure %d with message \n%s\n",
 292                         resp.resp_sub_errno, resp.resp_l1_msg);
 293                 return -EPERM;
 294         }
 295
 296         if ((action == PCI_REQ_SLOT_ELIGIBLE) && rc) {
 297                 pci_dbg(slot->pci_bus->self, "remove failed with error %d sub-error %d\n",
 298                         rc, resp.resp_sub_errno);
 299                 return -EIO;
 300         }
 301
 302         if ((action == PCI_REQ_SLOT_ELIGIBLE) && !rc)
 303                 return 0;
 304
 305         if ((action == PCI_REQ_SLOT_DISABLE) && !rc) {
 306                 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
 307                 pcibus_info->pbi_enabled_devices &= ~(1 << device_num);
 308                 pci_dbg(slot->pci_bus->self, "remove successful\n");
 309                 return 0;
 310         }
 311
 312         if ((action == PCI_REQ_SLOT_DISABLE) && rc) {
 313                 pci_dbg(slot->pci_bus->self, "remove failed rc = %d\n", rc);
 314         }
 315
 316         return rc;
 317 }
 318
 319 /*
 320  * Power up and configure the slot via a SAL call to PROM.
 321  * Scan slot (and any children), do any platform specific fixup,
 322  * and find device driver.
 323  */
 324 static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
 325 {
 326         struct slot *slot = bss_hotplug_slot->private;
 327         struct pci_bus *new_bus = NULL;
 328         struct pci_dev *dev;
 329         int num_funcs;
 330         int new_ppb = 0;
 331         int rc;
 332         char *ssdt = NULL;
 333         void pcibios_fixup_device_resources(struct pci_dev *);
 334
 335         /* Serialize the Linux PCI infrastructure */
 336         mutex_lock(&sn_hotplug_mutex);
 337
 338         /*
 339          * Power-on and initialize the slot in the SN
 340          * PCI infrastructure. Also, retrieve the ACPI SSDT
 341          * table for the slot (if ACPI capable PROM).
 342          */
 343         rc = sn_slot_enable(bss_hotplug_slot, slot->device_num, &ssdt);
 344         if (rc) {
 345                 mutex_unlock(&sn_hotplug_mutex);
 346                 return rc;
 347         }
 348
 349         if (ssdt)
 350                 ssdt = __va(ssdt);
 351         /* Add the new SSDT for the slot to the ACPI namespace */
 352         if (SN_ACPI_BASE_SUPPORT() && ssdt) {
 353                 acpi_status ret;
 354
 355                 ret = acpi_load_table((struct acpi_table_header *)ssdt);
 356                 if (ACPI_FAILURE(ret)) {
 357                         printk(KERN_ERR "%s: acpi_load_table failed (0x%x)\n",
 358                                __func__, ret);
 359                         /* try to continue on */
 360                 }
 361         }
 362
 363         num_funcs = pci_scan_slot(slot->pci_bus,
 364                                   PCI_DEVFN(slot->device_num + 1, 0));
 365         if (!num_funcs) {
 366                 pci_dbg(slot->pci_bus->self, "no device in slot\n");
 367                 mutex_unlock(&sn_hotplug_mutex);
 368                 return -ENODEV;
 369         }
 370
 371         /*
 372          * Map SN resources for all functions on the card
 373          * to the Linux PCI interface and tell the drivers
 374          * about them.
 375          */
 376         list_for_each_entry(dev, &slot->pci_bus->devices, bus_list) {
 377                 if (PCI_SLOT(dev->devfn) != slot->device_num + 1)
 378                         continue;
 379
 380                 /* Need to do slot fixup on PPB before fixup of children
 381                  * (PPB's pcidev_info needs to be in pcidev_info list
 382                  * before child's SN_PCIDEV_INFO() call to setup
 383                  * pdi_host_pcidev_info).
 384                  */
 385                 pcibios_fixup_device_resources(dev);
 386                 if (SN_ACPI_BASE_SUPPORT())
 387                         sn_acpi_slot_fixup(dev);
 388                 else
 389                         sn_io_slot_fixup(dev);
 390                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 391                         pci_hp_add_bridge(dev);
 392                         if (dev->subordinate) {
 393                                 new_bus = dev->subordinate;
 394                                 new_ppb = 1;
 395                         }
 396                 }
 397         }
 398
 399         /*
 400          * Add the slot's devices to the ACPI infrastructure */
 401         if (SN_ACPI_BASE_SUPPORT() && ssdt) {
 402                 unsigned long long adr;
 403                 struct acpi_device *pdevice;
 404                 acpi_handle phandle;
 405                 acpi_handle chandle = NULL;
 406                 acpi_handle rethandle;
 407                 acpi_status ret;
 408
 409                 phandle = acpi_device_handle(PCI_CONTROLLER(slot->pci_bus)->companion);
 410
 411                 if (acpi_bus_get_device(phandle, &pdevice)) {
 412                         pci_dbg(slot->pci_bus->self, "no parent device, assuming NULL\n");
 413                         pdevice = NULL;
 414                 }
 415
 416                 acpi_scan_lock_acquire();
 417                 /*
 418                  * Walk the rootbus node's immediate children looking for
 419                  * the slot's device node(s). There can be more than
 420                  * one for multifunction devices.
 421                  */
 422                 for (;;) {
 423                         rethandle = NULL;
 424                         ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
 425                                                    phandle, chandle,
 426                                                    &rethandle);
 427
 428                         if (ret == AE_NOT_FOUND || rethandle == NULL)
 429                                 break;
 430
 431                         chandle = rethandle;
 432
 433                         ret = acpi_evaluate_integer(chandle, METHOD_NAME__ADR,
 434                                                     NULL, &adr);
 435
 436                         if (ACPI_SUCCESS(ret) &&
 437                             (adr>>16) == (slot->device_num + 1)) {
 438
 439                                 ret = acpi_bus_scan(chandle);
 440                                 if (ACPI_FAILURE(ret)) {
 441                                         printk(KERN_ERR "%s: acpi_bus_scan failed (0x%x) for slot %d func %d\n",
 442                                                __func__, ret, (int)(adr>>16),
 443                                                (int)(adr&0xffff));
 444                                         /* try to continue on */
 445                                 }
 446                         }
 447                 }
 448                 acpi_scan_lock_release();
 449         }
 450
 451         pci_lock_rescan_remove();
 452
 453         /* Call the driver for the new device */
 454         pci_bus_add_devices(slot->pci_bus);
 455         /* Call the drivers for the new devices subordinate to PPB */
 456         if (new_ppb)
 457                 pci_bus_add_devices(new_bus);
 458
 459         pci_unlock_rescan_remove();
 460         mutex_unlock(&sn_hotplug_mutex);
 461
 462         if (rc == 0)
 463                 pci_dbg(slot->pci_bus->self, "insert operation successful\n");
 464         else
 465                 pci_dbg(slot->pci_bus->self, "insert operation failed rc = %d\n", rc);
 466
 467         return rc;
 468 }
 469
 470 static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
 471 {
 472         struct slot *slot = bss_hotplug_slot->private;
 473         struct pci_dev *dev, *temp;
 474         int rc;
 475         acpi_handle ssdt_hdl = NULL;
 476
 477         /* Acquire update access to the bus */
 478         mutex_lock(&sn_hotplug_mutex);
 479
 480         /* is it okay to bring this slot down? */
 481         rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
 482                              PCI_REQ_SLOT_ELIGIBLE);
 483         if (rc)
 484                 goto leaving;
 485
 486         /* free the ACPI resources for the slot */
 487         if (SN_ACPI_BASE_SUPPORT() &&
 488                 PCI_CONTROLLER(slot->pci_bus)->companion) {
 489                 unsigned long long adr;
 490                 struct acpi_device *device;
 491                 acpi_handle phandle;
 492                 acpi_handle chandle = NULL;
 493                 acpi_handle rethandle;
 494                 acpi_status ret;
 495
 496                 /* Get the rootbus node pointer */
 497                 phandle = acpi_device_handle(PCI_CONTROLLER(slot->pci_bus)->companion);
 498
 499                 acpi_scan_lock_acquire();
 500                 /*
 501                  * Walk the rootbus node's immediate children looking for
 502                  * the slot's device node(s). There can be more than
 503                  * one for multifunction devices.
 504                  */
 505                 for (;;) {
 506                         rethandle = NULL;
 507                         ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
 508                                                    phandle, chandle,
 509                                                    &rethandle);
 510
 511                         if (ret == AE_NOT_FOUND || rethandle == NULL)
 512                                 break;
 513
 514                         chandle = rethandle;
 515
 516                         ret = acpi_evaluate_integer(chandle,
 517                                                     METHOD_NAME__ADR,
 518                                                     NULL, &adr);
 519                         if (ACPI_SUCCESS(ret) &&
 520                             (adr>>16) == (slot->device_num + 1)) {
 521                                 /* retain the owner id */
 522                                 ssdt_hdl = chandle;
 523
 524                                 ret = acpi_bus_get_device(chandle,
 525                                                           &device);
 526                                 if (ACPI_SUCCESS(ret))
 527                                         acpi_bus_trim(device);
 528                         }
 529                 }
 530                 acpi_scan_lock_release();
 531         }
 532
 533         pci_lock_rescan_remove();
 534         /* Free the SN resources assigned to the Linux device.*/
 535         list_for_each_entry_safe(dev, temp, &slot->pci_bus->devices, bus_list) {
 536                 if (PCI_SLOT(dev->devfn) != slot->device_num + 1)
 537                         continue;
 538
 539                 pci_dev_get(dev);
 540                 sn_bus_free_data(dev);
 541                 pci_stop_and_remove_bus_device(dev);
 542                 pci_dev_put(dev);
 543         }
 544         pci_unlock_rescan_remove();
 545
 546         /* Remove the SSDT for the slot from the ACPI namespace */
 547         if (SN_ACPI_BASE_SUPPORT() && ssdt_hdl) {
 548                 acpi_status ret;
 549                 ret = acpi_unload_parent_table(ssdt_hdl);
 550                 if (ACPI_FAILURE(ret)) {
 551                         acpi_handle_err(ssdt_hdl,
 552                                         "%s: acpi_unload_parent_table failed (0x%x)\n",
 553                                         __func__, ret);
 554                         /* try to continue on */
 555                 }
 556         }
 557
 558         /* free the collected sysdata pointers */
 559         sn_bus_free_sysdata();
 560
 561         /* Deactivate slot */
 562         rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
 563                              PCI_REQ_SLOT_DISABLE);
 564  leaving:
 565         /* Release the bus lock */
 566         mutex_unlock(&sn_hotplug_mutex);
 567
 568         return rc;
 569 }
 570
 571 static inline int get_power_status(struct hotplug_slot *bss_hotplug_slot,
 572                                    u8 *value)
 573 {
 574         struct slot *slot = bss_hotplug_slot->private;
 575         struct pcibus_info *pcibus_info;
 576         u32 power;
 577
 578         pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
 579         mutex_lock(&sn_hotplug_mutex);
 580         power = pcibus_info->pbi_enabled_devices & (1 << slot->device_num);
 581         *value = power ? 1 : 0;
 582         mutex_unlock(&sn_hotplug_mutex);
 583         return 0;
 584 }
 585
 586 static void sn_release_slot(struct hotplug_slot *bss_hotplug_slot)
 587 {
 588         kfree(bss_hotplug_slot->info);
 589         kfree(bss_hotplug_slot->private);
 590         kfree(bss_hotplug_slot);
 591 }
 592
 593 static int sn_hotplug_slot_register(struct pci_bus *pci_bus)
 594 {
 595         int device;
 596         struct pci_slot *pci_slot;
 597         struct hotplug_slot *bss_hotplug_slot;
 598         char name[SN_SLOT_NAME_SIZE];
 599         int rc = 0;
 600
 601         /*
 602          * Currently only four devices are supported,
 603          * in the future there maybe more -- up to 32.
 604          */
 605
 606         for (device = 0; device < SN_MAX_HP_SLOTS ; device++) {
 607                 if (sn_pci_slot_valid(pci_bus, device) != 1)
 608                         continue;
 609
 610                 bss_hotplug_slot = kzalloc(sizeof(*bss_hotplug_slot),
 611                                            GFP_KERNEL);
 612                 if (!bss_hotplug_slot) {
 613                         rc = -ENOMEM;
 614                         goto alloc_err;
 615                 }
 616
 617                 bss_hotplug_slot->info =
 618                         kzalloc(sizeof(struct hotplug_slot_info),
 619                                 GFP_KERNEL);
 620                 if (!bss_hotplug_slot->info) {
 621                         rc = -ENOMEM;
 622                         goto alloc_err;
 623                 }
 624
 625                 if (sn_hp_slot_private_alloc(bss_hotplug_slot,
 626                                              pci_bus, device, name)) {
 627                         rc = -ENOMEM;
 628                         goto alloc_err;
 629                 }
 630                 bss_hotplug_slot->ops = &sn_hotplug_slot_ops;
 631
 632                 rc = pci_hp_register(bss_hotplug_slot, pci_bus, device, name);
 633                 if (rc)
 634                         goto register_err;
 635
 636                 pci_slot = bss_hotplug_slot->pci_slot;
 637                 rc = sysfs_create_file(&pci_slot->kobj,
 638                                        &sn_slot_path_attr.attr);
 639                 if (rc)
 640                         goto register_err;
 641         }
 642         pci_dbg(pci_bus->self, "Registered bus with hotplug\n");
 643         return rc;
 644
 645 register_err:
 646         pci_dbg(pci_bus->self, "bus failed to register with err = %d\n",
 647                 rc);
 648
 649 alloc_err:
 650         if (rc == -ENOMEM)
 651                 pci_dbg(pci_bus->self, "Memory allocation error\n");
 652
 653         /* destroy THIS element */
 654         if (bss_hotplug_slot)
 655                 sn_release_slot(bss_hotplug_slot);
 656
 657         /* destroy anything else on the list */
 658         while ((bss_hotplug_slot = sn_hp_destroy())) {
 659                 pci_hp_deregister(bss_hotplug_slot);
 660                 sn_release_slot(bss_hotplug_slot);
 661         }
 662
 663         return rc;
 664 }
 665
 666 static int __init sn_pci_hotplug_init(void)
 667 {
 668         struct pci_bus *pci_bus = NULL;
 669         int rc;
 670         int registered = 0;
 671
 672         if (!sn_prom_feature_available(PRF_HOTPLUG_SUPPORT)) {
 673                 printk(KERN_ERR "%s: PROM version does not support hotplug.\n",
 674                        __func__);
 675                 return -EPERM;
 676         }
 677
 678         INIT_LIST_HEAD(&sn_hp_list);
 679
 680         while ((pci_bus = pci_find_next_bus(pci_bus))) {
 681                 if (!pci_bus->sysdata)
 682                         continue;
 683
 684                 rc = sn_pci_bus_valid(pci_bus);
 685                 if (rc != 1) {
 686                         pci_dbg(pci_bus->self, "not a valid hotplug bus\n");
 687                         continue;
 688                 }
 689                 pci_dbg(pci_bus->self, "valid hotplug bus\n");
 690
 691                 rc = sn_hotplug_slot_register(pci_bus);
 692                 if (!rc) {
 693                         registered = 1;
 694                 } else {
 695                         registered = 0;
 696                         break;
 697                 }
 698         }
 699
 700         return registered == 1 ? 0 : -ENODEV;
 701 }
 702
 703 static void __exit sn_pci_hotplug_exit(void)
 704 {
 705         struct hotplug_slot *bss_hotplug_slot;
 706
 707         while ((bss_hotplug_slot = sn_hp_destroy())) {
 708                 pci_hp_deregister(bss_hotplug_slot);
 709                 sn_release_slot(bss_hotplug_slot);
 710         }
 711
 712         if (!list_empty(&sn_hp_list))
 713                 printk(KERN_ERR "%s: internal list is not empty\n", __FILE__);
 714 }
 715
 716 module_init(sn_pci_hotplug_init);
 717 module_exit(sn_pci_hotplug_exit);