drivers/pci/hotplug/pciehp_core.c

   1 /*
   2  * PCI Express Hot Plug Controller Driver
   3  *
   4  * Copyright (C) 1995,2001 Compaq Computer Corporation
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  * Copyright (C) 2003-2004 Intel Corporation
   8  *
   9  * All rights reserved.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or (at
  14  * your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19  * NON INFRINGEMENT.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/moduleparam.h>
  32 #include <linux/kernel.h>
  33 #include <linux/types.h>
  34 #include <linux/pci.h>
  35 #include "pciehp.h"
  36 #include <linux/interrupt.h>
  37 #include <linux/time.h>
  38
  39 /* Global variables */
  40 int pciehp_debug;
  41 int pciehp_poll_mode;
  42 int pciehp_poll_time;
  43 int pciehp_force;
  44 struct controller *pciehp_ctrl_list;
  45
  46 #define DRIVER_VERSION  "0.4"
  47 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
  48 #define DRIVER_DESC     "PCI Express Hot Plug Controller Driver"
  49
  50 MODULE_AUTHOR(DRIVER_AUTHOR);
  51 MODULE_DESCRIPTION(DRIVER_DESC);
  52 MODULE_LICENSE("GPL");
  53
  54 module_param(pciehp_debug, bool, 0644);
  55 module_param(pciehp_poll_mode, bool, 0644);
  56 module_param(pciehp_poll_time, int, 0644);
  57 module_param(pciehp_force, bool, 0644);
  58 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
  59 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
  60 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
  61 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
  62
  63 #define PCIE_MODULE_NAME "pciehp"
  64
  65 static int pcie_start_thread (void);
  66 static int set_attention_status (struct hotplug_slot *slot, u8 value);
  67 static int enable_slot          (struct hotplug_slot *slot);
  68 static int disable_slot         (struct hotplug_slot *slot);
  69 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  70 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  71 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  72 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  73 static int get_address          (struct hotplug_slot *slot, u32 *value);
  74 static int get_max_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  75 static int get_cur_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  76
  77 static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
  78         .owner =                THIS_MODULE,
  79         .set_attention_status = set_attention_status,
  80         .enable_slot =          enable_slot,
  81         .disable_slot =         disable_slot,
  82         .get_power_status =     get_power_status,
  83         .get_attention_status = get_attention_status,
  84         .get_latch_status =     get_latch_status,
  85         .get_adapter_status =   get_adapter_status,
  86         .get_address =          get_address,
  87         .get_max_bus_speed =    get_max_bus_speed,
  88         .get_cur_bus_speed =    get_cur_bus_speed,
  89 };
  90
  91 /*
  92  * Check the status of the Electro Mechanical Interlock (EMI)
  93  */
  94 static int get_lock_status(struct hotplug_slot *hotplug_slot, u8 *value)
  95 {
  96         struct slot *slot = hotplug_slot->private;
  97         return (slot->hpc_ops->get_emi_status(slot, value));
  98 }
  99
 100 /*
 101  * sysfs interface for the Electro Mechanical Interlock (EMI)
 102  * 1 == locked, 0 == unlocked
 103  */
 104 static ssize_t lock_read_file(struct hotplug_slot *slot, char *buf)
 105 {
 106         int retval;
 107         u8 value;
 108
 109         retval = get_lock_status(slot, &value);
 110         if (retval)
 111                 goto lock_read_exit;
 112         retval = sprintf (buf, "%d\n", value);
 113
 114 lock_read_exit:
 115         return retval;
 116 }
 117
 118 /*
 119  * Change the status of the Electro Mechanical Interlock (EMI)
 120  * This is a toggle - in addition there must be at least 1 second
 121  * in between toggles.
 122  */
 123 static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
 124 {
 125         struct slot *slot = hotplug_slot->private;
 126         int retval;
 127         u8 value;
 128
 129         mutex_lock(&slot->ctrl->crit_sect);
 130
 131         /* has it been >1 sec since our last toggle? */
 132         if ((get_seconds() - slot->last_emi_toggle) < 1)
 133                 return -EINVAL;
 134
 135         /* see what our current state is */
 136         retval = get_lock_status(hotplug_slot, &value);
 137         if (retval || (value == status))
 138                 goto set_lock_exit;
 139
 140         slot->hpc_ops->toggle_emi(slot);
 141 set_lock_exit:
 142         mutex_unlock(&slot->ctrl->crit_sect);
 143         return 0;
 144 }
 145
 146 /*
 147  * sysfs interface which allows the user to toggle the Electro Mechanical
 148  * Interlock.  Valid values are either 0 or 1.  0 == unlock, 1 == lock
 149  */
 150 static ssize_t lock_write_file(struct hotplug_slot *slot, const char *buf,
 151                 size_t count)
 152 {
 153         unsigned long llock;
 154         u8 lock;
 155         int retval = 0;
 156
 157         llock = simple_strtoul(buf, NULL, 10);
 158         lock = (u8)(llock & 0xff);
 159
 160         switch (lock) {
 161                 case 0:
 162                 case 1:
 163                         retval = set_lock_status(slot, lock);
 164                         break;
 165                 default:
 166                         err ("%d is an invalid lock value\n", lock);
 167                         retval = -EINVAL;
 168         }
 169         if (retval)
 170                 return retval;
 171         return count;
 172 }
 173
 174 static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
 175         .attr = {.name = "lock", .mode = S_IFREG | S_IRUGO | S_IWUSR},
 176         .show = lock_read_file,
 177         .store = lock_write_file
 178 };
 179
 180 /**
 181  * release_slot - free up the memory used by a slot
 182  * @hotplug_slot: slot to free
 183  */
 184 static void release_slot(struct hotplug_slot *hotplug_slot)
 185 {
 186         struct slot *slot = hotplug_slot->private;
 187
 188         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 189
 190         kfree(slot->hotplug_slot->info);
 191         kfree(slot->hotplug_slot);
 192         kfree(slot);
 193 }
 194
 195 static void make_slot_name(struct slot *slot)
 196 {
 197         snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
 198                  slot->bus, slot->number);
 199 }
 200
 201 static int init_slots(struct controller *ctrl)
 202 {
 203         struct slot *slot;
 204         struct hotplug_slot *hotplug_slot;
 205         struct hotplug_slot_info *info;
 206         int retval = -ENOMEM;
 207         int i;
 208
 209         for (i = 0; i < ctrl->num_slots; i++) {
 210                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 211                 if (!slot)
 212                         goto error;
 213
 214                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
 215                 if (!hotplug_slot)
 216                         goto error_slot;
 217                 slot->hotplug_slot = hotplug_slot;
 218
 219                 info = kzalloc(sizeof(*info), GFP_KERNEL);
 220                 if (!info)
 221                         goto error_hpslot;
 222                 hotplug_slot->info = info;
 223
 224                 hotplug_slot->name = slot->name;
 225
 226                 slot->hp_slot = i;
 227                 slot->ctrl = ctrl;
 228                 slot->bus = ctrl->pci_dev->subordinate->number;
 229                 slot->device = ctrl->slot_device_offset + i;
 230                 slot->hpc_ops = ctrl->hpc_ops;
 231                 slot->number = ctrl->first_slot;
 232
 233                 /* register this slot with the hotplug pci core */
 234                 hotplug_slot->private = slot;
 235                 hotplug_slot->release = &release_slot;
 236                 make_slot_name(slot);
 237                 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
 238
 239                 get_power_status(hotplug_slot, &info->power_status);
 240                 get_attention_status(hotplug_slot, &info->attention_status);
 241                 get_latch_status(hotplug_slot, &info->latch_status);
 242                 get_adapter_status(hotplug_slot, &info->adapter_status);
 243
 244                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
 245                     "slot_device_offset=%x\n", slot->bus, slot->device,
 246                     slot->hp_slot, slot->number, ctrl->slot_device_offset);
 247                 retval = pci_hp_register(hotplug_slot);
 248                 if (retval) {
 249                         err ("pci_hp_register failed with error %d\n", retval);
 250                         goto error_info;
 251                 }
 252                 /* create additional sysfs entries */
 253                 if (EMI(ctrl->ctrlcap)) {
 254                         retval = sysfs_create_file(&hotplug_slot->kobj,
 255                                 &hotplug_slot_attr_lock.attr);
 256                         if (retval) {
 257                                 pci_hp_deregister(hotplug_slot);
 258                                 err("cannot create additional sysfs entries\n");
 259                                 goto error_info;
 260                         }
 261                 }
 262
 263                 list_add(&slot->slot_list, &ctrl->slot_list);
 264         }
 265
 266         return 0;
 267 error_info:
 268         kfree(info);
 269 error_hpslot:
 270         kfree(hotplug_slot);
 271 error_slot:
 272         kfree(slot);
 273 error:
 274         return retval;
 275 }
 276
 277 static void cleanup_slots(struct controller *ctrl)
 278 {
 279         struct list_head *tmp;
 280         struct list_head *next;
 281         struct slot *slot;
 282
 283         list_for_each_safe(tmp, next, &ctrl->slot_list) {
 284                 slot = list_entry(tmp, struct slot, slot_list);
 285                 list_del(&slot->slot_list);
 286                 if (EMI(ctrl->ctrlcap))
 287                         sysfs_remove_file(&slot->hotplug_slot->kobj,
 288                                 &hotplug_slot_attr_lock.attr);
 289                 pci_hp_deregister(slot->hotplug_slot);
 290         }
 291 }
 292
 293 /*
 294  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 295  */
 296 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 297 {
 298         struct slot *slot = hotplug_slot->private;
 299
 300         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 301
 302         hotplug_slot->info->attention_status = status;
 303
 304         if (ATTN_LED(slot->ctrl->ctrlcap))
 305                 slot->hpc_ops->set_attention_status(slot, status);
 306
 307         return 0;
 308 }
 309
 310
 311 static int enable_slot(struct hotplug_slot *hotplug_slot)
 312 {
 313         struct slot *slot = hotplug_slot->private;
 314
 315         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 316
 317         return pciehp_enable_slot(slot);
 318 }
 319
 320
 321 static int disable_slot(struct hotplug_slot *hotplug_slot)
 322 {
 323         struct slot *slot = hotplug_slot->private;
 324
 325         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 326
 327         return pciehp_disable_slot(slot);
 328 }
 329
 330 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 331 {
 332         struct slot *slot = hotplug_slot->private;
 333         int retval;
 334
 335         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 336
 337         retval = slot->hpc_ops->get_power_status(slot, value);
 338         if (retval < 0)
 339                 *value = hotplug_slot->info->power_status;
 340
 341         return 0;
 342 }
 343
 344 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 345 {
 346         struct slot *slot = hotplug_slot->private;
 347         int retval;
 348
 349         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 350
 351         retval = slot->hpc_ops->get_attention_status(slot, value);
 352         if (retval < 0)
 353                 *value = hotplug_slot->info->attention_status;
 354
 355         return 0;
 356 }
 357
 358 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 359 {
 360         struct slot *slot = hotplug_slot->private;
 361         int retval;
 362
 363         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 364
 365         retval = slot->hpc_ops->get_latch_status(slot, value);
 366         if (retval < 0)
 367                 *value = hotplug_slot->info->latch_status;
 368
 369         return 0;
 370 }
 371
 372 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 373 {
 374         struct slot *slot = hotplug_slot->private;
 375         int retval;
 376
 377         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 378
 379         retval = slot->hpc_ops->get_adapter_status(slot, value);
 380         if (retval < 0)
 381                 *value = hotplug_slot->info->adapter_status;
 382
 383         return 0;
 384 }
 385
 386 static int get_address(struct hotplug_slot *hotplug_slot, u32 *value)
 387 {
 388         struct slot *slot = hotplug_slot->private;
 389         struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;
 390
 391         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 392
 393         *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;
 394
 395         return 0;
 396 }
 397
 398 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 399 {
 400         struct slot *slot = hotplug_slot->private;
 401         int retval;
 402
 403         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 404
 405         retval = slot->hpc_ops->get_max_bus_speed(slot, value);
 406         if (retval < 0)
 407                 *value = PCI_SPEED_UNKNOWN;
 408
 409         return 0;
 410 }
 411
 412 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 413 {
 414         struct slot *slot = hotplug_slot->private;
 415         int retval;
 416
 417         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 418
 419         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
 420         if (retval < 0)
 421                 *value = PCI_SPEED_UNKNOWN;
 422
 423         return 0;
 424 }
 425
 426 static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
 427 {
 428         int rc;
 429         struct controller *ctrl;
 430         struct slot *t_slot;
 431         u8 value;
 432         struct pci_dev *pdev;
 433
 434         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 435         if (!ctrl) {
 436                 err("%s : out of memory\n", __FUNCTION__);
 437                 goto err_out_none;
 438         }
 439         INIT_LIST_HEAD(&ctrl->slot_list);
 440
 441         pdev = dev->port;
 442         ctrl->pci_dev = pdev;
 443
 444         rc = pcie_init(ctrl, dev);
 445         if (rc) {
 446                 dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
 447                 goto err_out_free_ctrl;
 448         }
 449
 450         pci_set_drvdata(pdev, ctrl);
 451
 452         ctrl->bus = pdev->bus->number;  /* ctrl bus */
 453         ctrl->slot_bus = pdev->subordinate->number;  /* bus controlled by this HPC */
 454
 455         ctrl->device = PCI_SLOT(pdev->devfn);
 456         ctrl->function = PCI_FUNC(pdev->devfn);
 457         dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", __FUNCTION__,
 458                 ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
 459
 460         /* Setup the slot information structures */
 461         rc = init_slots(ctrl);
 462         if (rc) {
 463                 err("%s: slot initialization failed\n", PCIE_MODULE_NAME);
 464                 goto err_out_release_ctlr;
 465         }
 466
 467         t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
 468
 469         /*      Finish setting up the hot plug ctrl device */
 470         ctrl->next_event = 0;
 471
 472         if (!pciehp_ctrl_list) {
 473                 pciehp_ctrl_list = ctrl;
 474                 ctrl->next = NULL;
 475         } else {
 476                 ctrl->next = pciehp_ctrl_list;
 477                 pciehp_ctrl_list = ctrl;
 478         }
 479
 480         t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
 481         if ((POWER_CTRL(ctrl->ctrlcap)) && !value) {
 482                 rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
 483                 if (rc)
 484                         goto err_out_free_ctrl_slot;
 485         }
 486
 487         return 0;
 488
 489 err_out_free_ctrl_slot:
 490         cleanup_slots(ctrl);
 491 err_out_release_ctlr:
 492         ctrl->hpc_ops->release_ctlr(ctrl);
 493 err_out_free_ctrl:
 494         kfree(ctrl);
 495 err_out_none:
 496         return -ENODEV;
 497 }
 498
 499
 500 static int pcie_start_thread(void)
 501 {
 502         int retval = 0;
 503
 504         dbg("Initialize + Start the notification/polling mechanism \n");
 505
 506         retval = pciehp_event_start_thread();
 507         if (retval) {
 508                 dbg("pciehp_event_start_thread() failed\n");
 509                 return retval;
 510         }
 511
 512         return retval;
 513 }
 514
 515 static void __exit unload_pciehpd(void)
 516 {
 517         struct controller *ctrl;
 518         struct controller *tctrl;
 519
 520         ctrl = pciehp_ctrl_list;
 521
 522         while (ctrl) {
 523                 cleanup_slots(ctrl);
 524
 525                 ctrl->hpc_ops->release_ctlr(ctrl);
 526
 527                 tctrl = ctrl;
 528                 ctrl = ctrl->next;
 529
 530                 kfree(tctrl);
 531         }
 532
 533         /* Stop the notification mechanism */
 534         pciehp_event_stop_thread();
 535
 536 }
 537
 538 static void pciehp_remove (struct pcie_device *device)
 539 {
 540         /* XXX - Needs to be adapted to device driver model */
 541 }
 542
 543 #ifdef CONFIG_PM
 544 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
 545 {
 546         printk("%s ENTRY\n", __FUNCTION__);
 547         return 0;
 548 }
 549
 550 static int pciehp_resume (struct pcie_device *dev)
 551 {
 552         printk("%s ENTRY\n", __FUNCTION__);
 553         return 0;
 554 }
 555 #endif
 556
 557 static struct pcie_port_service_id port_pci_ids[] = { {
 558         .vendor = PCI_ANY_ID,
 559         .device = PCI_ANY_ID,
 560         .port_type = PCIE_ANY_PORT,
 561         .service_type = PCIE_PORT_SERVICE_HP,
 562         .driver_data =  0,
 563         }, { /* end: all zeroes */ }
 564 };
 565 static const char device_name[] = "hpdriver";
 566
 567 static struct pcie_port_service_driver hpdriver_portdrv = {
 568         .name           = (char *)device_name,
 569         .id_table       = &port_pci_ids[0],
 570
 571         .probe          = pciehp_probe,
 572         .remove         = pciehp_remove,
 573
 574 #ifdef  CONFIG_PM
 575         .suspend        = pciehp_suspend,
 576         .resume         = pciehp_resume,
 577 #endif  /* PM */
 578 };
 579
 580 static int __init pcied_init(void)
 581 {
 582         int retval = 0;
 583
 584 #ifdef CONFIG_HOTPLUG_PCI_PCIE_POLL_EVENT_MODE
 585         pciehp_poll_mode = 1;
 586 #endif
 587
 588         retval = pcie_start_thread();
 589         if (retval)
 590                 goto error_hpc_init;
 591
 592         retval = pcie_port_service_register(&hpdriver_portdrv);
 593         dbg("pcie_port_service_register = %d\n", retval);
 594         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 595         if (retval)
 596                 dbg("%s: Failure to register service\n", __FUNCTION__);
 597
 598 error_hpc_init:
 599         if (retval) {
 600                 pciehp_event_stop_thread();
 601         };
 602
 603         return retval;
 604 }
 605
 606 static void __exit pcied_cleanup(void)
 607 {
 608         dbg("unload_pciehpd()\n");
 609         unload_pciehpd();
 610
 611         pcie_port_service_unregister(&hpdriver_portdrv);
 612
 613         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 614 }
 615
 616 module_init(pcied_init);
 617 module_exit(pcied_cleanup);