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 workqueue_struct *pciehp_wq;
  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 set_attention_status (struct hotplug_slot *slot, u8 value);
  66 static int enable_slot          (struct hotplug_slot *slot);
  67 static int disable_slot         (struct hotplug_slot *slot);
  68 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  69 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  70 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  71 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  72 static int get_max_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  73 static int get_cur_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  74
  75 static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
  76         .owner =                THIS_MODULE,
  77         .set_attention_status = set_attention_status,
  78         .enable_slot =          enable_slot,
  79         .disable_slot =         disable_slot,
  80         .get_power_status =     get_power_status,
  81         .get_attention_status = get_attention_status,
  82         .get_latch_status =     get_latch_status,
  83         .get_adapter_status =   get_adapter_status,
  84         .get_max_bus_speed =    get_max_bus_speed,
  85         .get_cur_bus_speed =    get_cur_bus_speed,
  86 };
  87
  88 /*
  89  * Check the status of the Electro Mechanical Interlock (EMI)
  90  */
  91 static int get_lock_status(struct hotplug_slot *hotplug_slot, u8 *value)
  92 {
  93         struct slot *slot = hotplug_slot->private;
  94         return (slot->hpc_ops->get_emi_status(slot, value));
  95 }
  96
  97 /*
  98  * sysfs interface for the Electro Mechanical Interlock (EMI)
  99  * 1 == locked, 0 == unlocked
 100  */
 101 static ssize_t lock_read_file(struct hotplug_slot *slot, char *buf)
 102 {
 103         int retval;
 104         u8 value;
 105
 106         retval = get_lock_status(slot, &value);
 107         if (retval)
 108                 goto lock_read_exit;
 109         retval = sprintf (buf, "%d\n", value);
 110
 111 lock_read_exit:
 112         return retval;
 113 }
 114
 115 /*
 116  * Change the status of the Electro Mechanical Interlock (EMI)
 117  * This is a toggle - in addition there must be at least 1 second
 118  * in between toggles.
 119  */
 120 static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
 121 {
 122         struct slot *slot = hotplug_slot->private;
 123         int retval;
 124         u8 value;
 125
 126         mutex_lock(&slot->ctrl->crit_sect);
 127
 128         /* has it been >1 sec since our last toggle? */
 129         if ((get_seconds() - slot->last_emi_toggle) < 1) {
 130                 mutex_unlock(&slot->ctrl->crit_sect);
 131                 return -EINVAL;
 132         }
 133
 134         /* see what our current state is */
 135         retval = get_lock_status(hotplug_slot, &value);
 136         if (retval || (value == status))
 137                 goto set_lock_exit;
 138
 139         slot->hpc_ops->toggle_emi(slot);
 140 set_lock_exit:
 141         mutex_unlock(&slot->ctrl->crit_sect);
 142         return 0;
 143 }
 144
 145 /*
 146  * sysfs interface which allows the user to toggle the Electro Mechanical
 147  * Interlock.  Valid values are either 0 or 1.  0 == unlock, 1 == lock
 148  */
 149 static ssize_t lock_write_file(struct hotplug_slot *hotplug_slot,
 150                 const char *buf, size_t count)
 151 {
 152         struct slot *slot = hotplug_slot->private;
 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(hotplug_slot, lock);
 164                         break;
 165                 default:
 166                         ctrl_err(slot->ctrl, "%d is an invalid lock value\n",
 167                                  lock);
 168                         retval = -EINVAL;
 169         }
 170         if (retval)
 171                 return retval;
 172         return count;
 173 }
 174
 175 static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
 176         .attr = {.name = "lock", .mode = S_IFREG | S_IRUGO | S_IWUSR},
 177         .show = lock_read_file,
 178         .store = lock_write_file
 179 };
 180
 181 /**
 182  * release_slot - free up the memory used by a slot
 183  * @hotplug_slot: slot to free
 184  */
 185 static void release_slot(struct hotplug_slot *hotplug_slot)
 186 {
 187         struct slot *slot = hotplug_slot->private;
 188
 189         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 190                  __func__, hotplug_slot_name(hotplug_slot));
 191
 192         kfree(hotplug_slot->info);
 193         kfree(hotplug_slot);
 194 }
 195
 196 static int init_slots(struct controller *ctrl)
 197 {
 198         struct slot *slot;
 199         struct hotplug_slot *hotplug_slot;
 200         struct hotplug_slot_info *info;
 201         char name[SLOT_NAME_SIZE];
 202         int retval = -ENOMEM;
 203
 204         list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
 205                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
 206                 if (!hotplug_slot)
 207                         goto error;
 208
 209                 info = kzalloc(sizeof(*info), GFP_KERNEL);
 210                 if (!info)
 211                         goto error_hpslot;
 212
 213                 /* register this slot with the hotplug pci core */
 214                 hotplug_slot->info = info;
 215                 hotplug_slot->private = slot;
 216                 hotplug_slot->release = &release_slot;
 217                 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
 218                 slot->hotplug_slot = hotplug_slot;
 219                 snprintf(name, SLOT_NAME_SIZE, "%u", slot->number);
 220
 221                 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
 222                          "hp_slot=%x sun=%x slot_device_offset=%x\n",
 223                          pci_domain_nr(ctrl->pci_dev->subordinate),
 224                          slot->bus, slot->device, slot->hp_slot, slot->number,
 225                          ctrl->slot_device_offset);
 226                 retval = pci_hp_register(hotplug_slot,
 227                                          ctrl->pci_dev->subordinate,
 228                                          slot->device,
 229                                          name);
 230                 if (retval) {
 231                         ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
 232                                  retval);
 233                         goto error_info;
 234                 }
 235                 get_power_status(hotplug_slot, &info->power_status);
 236                 get_attention_status(hotplug_slot, &info->attention_status);
 237                 get_latch_status(hotplug_slot, &info->latch_status);
 238                 get_adapter_status(hotplug_slot, &info->adapter_status);
 239                 /* create additional sysfs entries */
 240                 if (EMI(ctrl)) {
 241                         retval = sysfs_create_file(&hotplug_slot->pci_slot->kobj,
 242                                 &hotplug_slot_attr_lock.attr);
 243                         if (retval) {
 244                                 pci_hp_deregister(hotplug_slot);
 245                                 ctrl_err(ctrl, "Cannot create additional sysfs "
 246                                          "entries\n");
 247                                 goto error_info;
 248                         }
 249                 }
 250         }
 251
 252         return 0;
 253 error_info:
 254         kfree(info);
 255 error_hpslot:
 256         kfree(hotplug_slot);
 257 error:
 258         return retval;
 259 }
 260
 261 static void cleanup_slots(struct controller *ctrl)
 262 {
 263         struct slot *slot;
 264
 265         list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
 266                 if (EMI(ctrl))
 267                         sysfs_remove_file(&slot->hotplug_slot->pci_slot->kobj,
 268                                 &hotplug_slot_attr_lock.attr);
 269                 pci_hp_deregister(slot->hotplug_slot);
 270         }
 271 }
 272
 273 /*
 274  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 275  */
 276 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 277 {
 278         struct slot *slot = hotplug_slot->private;
 279
 280         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 281                   __func__, slot_name(slot));
 282
 283         hotplug_slot->info->attention_status = status;
 284
 285         if (ATTN_LED(slot->ctrl))
 286                 slot->hpc_ops->set_attention_status(slot, status);
 287
 288         return 0;
 289 }
 290
 291
 292 static int enable_slot(struct hotplug_slot *hotplug_slot)
 293 {
 294         struct slot *slot = hotplug_slot->private;
 295
 296         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 297                  __func__, slot_name(slot));
 298
 299         return pciehp_sysfs_enable_slot(slot);
 300 }
 301
 302
 303 static int disable_slot(struct hotplug_slot *hotplug_slot)
 304 {
 305         struct slot *slot = hotplug_slot->private;
 306
 307         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 308                   __func__, slot_name(slot));
 309
 310         return pciehp_sysfs_disable_slot(slot);
 311 }
 312
 313 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 314 {
 315         struct slot *slot = hotplug_slot->private;
 316         int retval;
 317
 318         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 319                   __func__, slot_name(slot));
 320
 321         retval = slot->hpc_ops->get_power_status(slot, value);
 322         if (retval < 0)
 323                 *value = hotplug_slot->info->power_status;
 324
 325         return 0;
 326 }
 327
 328 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 329 {
 330         struct slot *slot = hotplug_slot->private;
 331         int retval;
 332
 333         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 334                   __func__, slot_name(slot));
 335
 336         retval = slot->hpc_ops->get_attention_status(slot, value);
 337         if (retval < 0)
 338                 *value = hotplug_slot->info->attention_status;
 339
 340         return 0;
 341 }
 342
 343 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 344 {
 345         struct slot *slot = hotplug_slot->private;
 346         int retval;
 347
 348         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 349                  __func__, slot_name(slot));
 350
 351         retval = slot->hpc_ops->get_latch_status(slot, value);
 352         if (retval < 0)
 353                 *value = hotplug_slot->info->latch_status;
 354
 355         return 0;
 356 }
 357
 358 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 359 {
 360         struct slot *slot = hotplug_slot->private;
 361         int retval;
 362
 363         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 364                  __func__, slot_name(slot));
 365
 366         retval = slot->hpc_ops->get_adapter_status(slot, value);
 367         if (retval < 0)
 368                 *value = hotplug_slot->info->adapter_status;
 369
 370         return 0;
 371 }
 372
 373 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
 374                                 enum pci_bus_speed *value)
 375 {
 376         struct slot *slot = hotplug_slot->private;
 377         int retval;
 378
 379         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 380                  __func__, slot_name(slot));
 381
 382         retval = slot->hpc_ops->get_max_bus_speed(slot, value);
 383         if (retval < 0)
 384                 *value = PCI_SPEED_UNKNOWN;
 385
 386         return 0;
 387 }
 388
 389 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 390 {
 391         struct slot *slot = hotplug_slot->private;
 392         int retval;
 393
 394         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 395                  __func__, slot_name(slot));
 396
 397         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
 398         if (retval < 0)
 399                 *value = PCI_SPEED_UNKNOWN;
 400
 401         return 0;
 402 }
 403
 404 static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
 405 {
 406         int rc;
 407         struct controller *ctrl;
 408         struct slot *t_slot;
 409         u8 value;
 410         struct pci_dev *pdev = dev->port;
 411
 412         if (pciehp_force)
 413                 dev_info(&dev->device,
 414                          "Bypassing BIOS check for pciehp use on %s\n",
 415                          pci_name(pdev));
 416         else if (pciehp_get_hp_hw_control_from_firmware(pdev))
 417                 goto err_out_none;
 418
 419         ctrl = pcie_init(dev);
 420         if (!ctrl) {
 421                 dev_err(&dev->device, "Controller initialization failed\n");
 422                 goto err_out_none;
 423         }
 424         set_service_data(dev, ctrl);
 425
 426         /* Setup the slot information structures */
 427         rc = init_slots(ctrl);
 428         if (rc) {
 429                 if (rc == -EBUSY)
 430                         ctrl_warn(ctrl, "Slot already registered by another "
 431                                   "hotplug driver\n");
 432                 else
 433                         ctrl_err(ctrl, "Slot initialization failed\n");
 434                 goto err_out_release_ctlr;
 435         }
 436
 437         /* Check if slot is occupied */
 438         t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
 439         t_slot->hpc_ops->get_adapter_status(t_slot, &value);
 440         if (value) {
 441                 if (pciehp_force)
 442                         pciehp_enable_slot(t_slot);
 443         } else {
 444                 /* Power off slot if not occupied */
 445                 if (POWER_CTRL(ctrl)) {
 446                         rc = t_slot->hpc_ops->power_off_slot(t_slot);
 447                         if (rc)
 448                                 goto err_out_free_ctrl_slot;
 449                 }
 450         }
 451
 452         return 0;
 453
 454 err_out_free_ctrl_slot:
 455         cleanup_slots(ctrl);
 456 err_out_release_ctlr:
 457         ctrl->hpc_ops->release_ctlr(ctrl);
 458 err_out_none:
 459         return -ENODEV;
 460 }
 461
 462 static void pciehp_remove (struct pcie_device *dev)
 463 {
 464         struct controller *ctrl = get_service_data(dev);
 465
 466         cleanup_slots(ctrl);
 467         ctrl->hpc_ops->release_ctlr(ctrl);
 468 }
 469
 470 #ifdef CONFIG_PM
 471 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
 472 {
 473         dev_info(&dev->device, "%s ENTRY\n", __func__);
 474         return 0;
 475 }
 476
 477 static int pciehp_resume (struct pcie_device *dev)
 478 {
 479         dev_info(&dev->device, "%s ENTRY\n", __func__);
 480         if (pciehp_force) {
 481                 struct controller *ctrl = get_service_data(dev);
 482                 struct slot *t_slot;
 483                 u8 status;
 484
 485                 /* reinitialize the chipset's event detection logic */
 486                 pcie_enable_notification(ctrl);
 487
 488                 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
 489
 490                 /* Check if slot is occupied */
 491                 t_slot->hpc_ops->get_adapter_status(t_slot, &status);
 492                 if (status)
 493                         pciehp_enable_slot(t_slot);
 494                 else
 495                         pciehp_disable_slot(t_slot);
 496         }
 497         return 0;
 498 }
 499 #endif
 500
 501 static struct pcie_port_service_id port_pci_ids[] = { {
 502         .vendor = PCI_ANY_ID,
 503         .device = PCI_ANY_ID,
 504         .port_type = PCIE_ANY_PORT,
 505         .service_type = PCIE_PORT_SERVICE_HP,
 506         .driver_data =  0,
 507         }, { /* end: all zeroes */ }
 508 };
 509
 510 static struct pcie_port_service_driver hpdriver_portdrv = {
 511         .name           = PCIE_MODULE_NAME,
 512         .id_table       = &port_pci_ids[0],
 513
 514         .probe          = pciehp_probe,
 515         .remove         = pciehp_remove,
 516
 517 #ifdef  CONFIG_PM
 518         .suspend        = pciehp_suspend,
 519         .resume         = pciehp_resume,
 520 #endif  /* PM */
 521 };
 522
 523 static int __init pcied_init(void)
 524 {
 525         int retval = 0;
 526
 527         pciehp_firmware_init();
 528         retval = pcie_port_service_register(&hpdriver_portdrv);
 529         dbg("pcie_port_service_register = %d\n", retval);
 530         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 531         if (retval)
 532                 dbg("Failure to register service\n");
 533         return retval;
 534 }
 535
 536 static void __exit pcied_cleanup(void)
 537 {
 538         dbg("unload_pciehpd()\n");
 539         pcie_port_service_unregister(&hpdriver_portdrv);
 540         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 541 }
 542
 543 module_init(pcied_init);
 544 module_exit(pcied_cleanup);