drivers/pci/pcie/aer/aerdrv_core.c

   1 /*
   2  * drivers/pci/pcie/aer/aerdrv_core.c
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * This file implements the core part of PCI-Express AER. When an pci-express
   9  * error is delivered, an error message will be collected and printed to
  10  * console, then, an error recovery procedure will be executed by following
  11  * the pci error recovery rules.
  12  *
  13  * Copyright (C) 2006 Intel Corp.
  14  *      Tom Long Nguyen (tom.l.nguyen@intel.com)
  15  *      Zhang Yanmin (yanmin.zhang@intel.com)
  16  *
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/pci.h>
  21 #include <linux/kernel.h>
  22 #include <linux/errno.h>
  23 #include <linux/pm.h>
  24 #include <linux/suspend.h>
  25 #include <linux/delay.h>
  26 #include <linux/slab.h>
  27 #include "aerdrv.h"
  28
  29 static int forceload;
  30 static int nosourceid;
  31 module_param(forceload, bool, 0);
  32 module_param(nosourceid, bool, 0);
  33
  34 int pci_enable_pcie_error_reporting(struct pci_dev *dev)
  35 {
  36         u16 reg16 = 0;
  37         int pos;
  38
  39         if (dev->aer_firmware_first)
  40                 return -EIO;
  41
  42         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
  43         if (!pos)
  44                 return -EIO;
  45
  46         pos = pci_pcie_cap(dev);
  47         if (!pos)
  48                 return -EIO;
  49
  50         pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, &reg16);
  51         reg16 = reg16 |
  52                 PCI_EXP_DEVCTL_CERE |
  53                 PCI_EXP_DEVCTL_NFERE |
  54                 PCI_EXP_DEVCTL_FERE |
  55                 PCI_EXP_DEVCTL_URRE;
  56         pci_write_config_word(dev, pos+PCI_EXP_DEVCTL, reg16);
  57
  58         return 0;
  59 }
  60 EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
  61
  62 int pci_disable_pcie_error_reporting(struct pci_dev *dev)
  63 {
  64         u16 reg16 = 0;
  65         int pos;
  66
  67         if (dev->aer_firmware_first)
  68                 return -EIO;
  69
  70         pos = pci_pcie_cap(dev);
  71         if (!pos)
  72                 return -EIO;
  73
  74         pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, &reg16);
  75         reg16 = reg16 & ~(PCI_EXP_DEVCTL_CERE |
  76                         PCI_EXP_DEVCTL_NFERE |
  77                         PCI_EXP_DEVCTL_FERE |
  78                         PCI_EXP_DEVCTL_URRE);
  79         pci_write_config_word(dev, pos+PCI_EXP_DEVCTL, reg16);
  80
  81         return 0;
  82 }
  83 EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
  84
  85 int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
  86 {
  87         int pos;
  88         u32 status;
  89
  90         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
  91         if (!pos)
  92                 return -EIO;
  93
  94         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
  95         if (status)
  96                 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
  97
  98         return 0;
  99 }
 100 EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status);
 101
 102 /**
 103  * add_error_device - list device to be handled
 104  * @e_info: pointer to error info
 105  * @dev: pointer to pci_dev to be added
 106  */
 107 static int add_error_device(struct aer_err_info *e_info, struct pci_dev *dev)
 108 {
 109         if (e_info->error_dev_num < AER_MAX_MULTI_ERR_DEVICES) {
 110                 e_info->dev[e_info->error_dev_num] = dev;
 111                 e_info->error_dev_num++;
 112                 return 0;
 113         }
 114         return -ENOSPC;
 115 }
 116
 117 #define PCI_BUS(x)      (((x) >> 8) & 0xff)
 118
 119 /**
 120  * is_error_source - check whether the device is source of reported error
 121  * @dev: pointer to pci_dev to be checked
 122  * @e_info: pointer to reported error info
 123  */
 124 static bool is_error_source(struct pci_dev *dev, struct aer_err_info *e_info)
 125 {
 126         int pos;
 127         u32 status, mask;
 128         u16 reg16;
 129
 130         /*
 131          * When bus id is equal to 0, it might be a bad id
 132          * reported by root port.
 133          */
 134         if (!nosourceid && (PCI_BUS(e_info->id) != 0)) {
 135                 /* Device ID match? */
 136                 if (e_info->id == ((dev->bus->number << 8) | dev->devfn))
 137                         return true;
 138
 139                 /* Continue id comparing if there is no multiple error */
 140                 if (!e_info->multi_error_valid)
 141                         return false;
 142         }
 143
 144         /*
 145          * When either
 146          *      1) nosourceid==y;
 147          *      2) bus id is equal to 0. Some ports might lose the bus
 148          *              id of error source id;
 149          *      3) There are multiple errors and prior id comparing fails;
 150          * We check AER status registers to find possible reporter.
 151          */
 152         if (atomic_read(&dev->enable_cnt) == 0)
 153                 return false;
 154         pos = pci_pcie_cap(dev);
 155         if (!pos)
 156                 return false;
 157
 158         /* Check if AER is enabled */
 159         pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &reg16);
 160         if (!(reg16 & (
 161                 PCI_EXP_DEVCTL_CERE |
 162                 PCI_EXP_DEVCTL_NFERE |
 163                 PCI_EXP_DEVCTL_FERE |
 164                 PCI_EXP_DEVCTL_URRE)))
 165                 return false;
 166         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 167         if (!pos)
 168                 return false;
 169
 170         /* Check if error is recorded */
 171         if (e_info->severity == AER_CORRECTABLE) {
 172                 pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
 173                 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &mask);
 174         } else {
 175                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
 176                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &mask);
 177         }
 178         if (status & ~mask)
 179                 return true;
 180
 181         return false;
 182 }
 183
 184 static int find_device_iter(struct pci_dev *dev, void *data)
 185 {
 186         struct aer_err_info *e_info = (struct aer_err_info *)data;
 187
 188         if (is_error_source(dev, e_info)) {
 189                 /* List this device */
 190                 if (add_error_device(e_info, dev)) {
 191                         /* We cannot handle more... Stop iteration */
 192                         /* TODO: Should print error message here? */
 193                         return 1;
 194                 }
 195
 196                 /* If there is only a single error, stop iteration */
 197                 if (!e_info->multi_error_valid)
 198                         return 1;
 199         }
 200         return 0;
 201 }
 202
 203 /**
 204  * find_source_device - search through device hierarchy for source device
 205  * @parent: pointer to Root Port pci_dev data structure
 206  * @e_info: including detailed error information such like id
 207  *
 208  * Return true if found.
 209  *
 210  * Invoked by DPC when error is detected at the Root Port.
 211  */
 212 static bool find_source_device(struct pci_dev *parent,
 213                 struct aer_err_info *e_info)
 214 {
 215         struct pci_dev *dev = parent;
 216         int result;
 217
 218         /* Is Root Port an agent that sends error message? */
 219         result = find_device_iter(dev, e_info);
 220         if (result)
 221                 return true;
 222
 223         pci_walk_bus(parent->subordinate, find_device_iter, e_info);
 224
 225         if (!e_info->error_dev_num) {
 226                 dev_printk(KERN_DEBUG, &parent->dev,
 227                                 "can't find device of ID%04x\n",
 228                                 e_info->id);
 229                 return false;
 230         }
 231         return true;
 232 }
 233
 234 static int report_error_detected(struct pci_dev *dev, void *data)
 235 {
 236         pci_ers_result_t vote;
 237         struct pci_error_handlers *err_handler;
 238         struct aer_broadcast_data *result_data;
 239         result_data = (struct aer_broadcast_data *) data;
 240
 241         dev->error_state = result_data->state;
 242
 243         if (!dev->driver ||
 244                 !dev->driver->err_handler ||
 245                 !dev->driver->err_handler->error_detected) {
 246                 if (result_data->state == pci_channel_io_frozen &&
 247                         !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) {
 248                         /*
 249                          * In case of fatal recovery, if one of down-
 250                          * stream device has no driver. We might be
 251                          * unable to recover because a later insmod
 252                          * of a driver for this device is unaware of
 253                          * its hw state.
 254                          */
 255                         dev_printk(KERN_DEBUG, &dev->dev, "device has %s\n",
 256                                    dev->driver ?
 257                                    "no AER-aware driver" : "no driver");
 258                 }
 259                 return 0;
 260         }
 261
 262         err_handler = dev->driver->err_handler;
 263         vote = err_handler->error_detected(dev, result_data->state);
 264         result_data->result = merge_result(result_data->result, vote);
 265         return 0;
 266 }
 267
 268 static int report_mmio_enabled(struct pci_dev *dev, void *data)
 269 {
 270         pci_ers_result_t vote;
 271         struct pci_error_handlers *err_handler;
 272         struct aer_broadcast_data *result_data;
 273         result_data = (struct aer_broadcast_data *) data;
 274
 275         if (!dev->driver ||
 276                 !dev->driver->err_handler ||
 277                 !dev->driver->err_handler->mmio_enabled)
 278                 return 0;
 279
 280         err_handler = dev->driver->err_handler;
 281         vote = err_handler->mmio_enabled(dev);
 282         result_data->result = merge_result(result_data->result, vote);
 283         return 0;
 284 }
 285
 286 static int report_slot_reset(struct pci_dev *dev, void *data)
 287 {
 288         pci_ers_result_t vote;
 289         struct pci_error_handlers *err_handler;
 290         struct aer_broadcast_data *result_data;
 291         result_data = (struct aer_broadcast_data *) data;
 292
 293         if (!dev->driver ||
 294                 !dev->driver->err_handler ||
 295                 !dev->driver->err_handler->slot_reset)
 296                 return 0;
 297
 298         err_handler = dev->driver->err_handler;
 299         vote = err_handler->slot_reset(dev);
 300         result_data->result = merge_result(result_data->result, vote);
 301         return 0;
 302 }
 303
 304 static int report_resume(struct pci_dev *dev, void *data)
 305 {
 306         struct pci_error_handlers *err_handler;
 307
 308         dev->error_state = pci_channel_io_normal;
 309
 310         if (!dev->driver ||
 311                 !dev->driver->err_handler ||
 312                 !dev->driver->err_handler->resume)
 313                 return 0;
 314
 315         err_handler = dev->driver->err_handler;
 316         err_handler->resume(dev);
 317         return 0;
 318 }
 319
 320 /**
 321  * broadcast_error_message - handle message broadcast to downstream drivers
 322  * @dev: pointer to from where in a hierarchy message is broadcasted down
 323  * @state: error state
 324  * @error_mesg: message to print
 325  * @cb: callback to be broadcasted
 326  *
 327  * Invoked during error recovery process. Once being invoked, the content
 328  * of error severity will be broadcasted to all downstream drivers in a
 329  * hierarchy in question.
 330  */
 331 static pci_ers_result_t broadcast_error_message(struct pci_dev *dev,
 332         enum pci_channel_state state,
 333         char *error_mesg,
 334         int (*cb)(struct pci_dev *, void *))
 335 {
 336         struct aer_broadcast_data result_data;
 337
 338         dev_printk(KERN_DEBUG, &dev->dev, "broadcast %s message\n", error_mesg);
 339         result_data.state = state;
 340         if (cb == report_error_detected)
 341                 result_data.result = PCI_ERS_RESULT_CAN_RECOVER;
 342         else
 343                 result_data.result = PCI_ERS_RESULT_RECOVERED;
 344
 345         if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
 346                 /*
 347                  * If the error is reported by a bridge, we think this error
 348                  * is related to the downstream link of the bridge, so we
 349                  * do error recovery on all subordinates of the bridge instead
 350                  * of the bridge and clear the error status of the bridge.
 351                  */
 352                 if (cb == report_error_detected)
 353                         dev->error_state = state;
 354                 pci_walk_bus(dev->subordinate, cb, &result_data);
 355                 if (cb == report_resume) {
 356                         pci_cleanup_aer_uncorrect_error_status(dev);
 357                         dev->error_state = pci_channel_io_normal;
 358                 }
 359         } else {
 360                 /*
 361                  * If the error is reported by an end point, we think this
 362                  * error is related to the upstream link of the end point.
 363                  */
 364                 pci_walk_bus(dev->bus, cb, &result_data);
 365         }
 366
 367         return result_data.result;
 368 }
 369
 370 struct find_aer_service_data {
 371         struct pcie_port_service_driver *aer_driver;
 372         int is_downstream;
 373 };
 374
 375 static int find_aer_service_iter(struct device *device, void *data)
 376 {
 377         struct device_driver *driver;
 378         struct pcie_port_service_driver *service_driver;
 379         struct find_aer_service_data *result;
 380
 381         result = (struct find_aer_service_data *) data;
 382
 383         if (device->bus == &pcie_port_bus_type) {
 384                 struct pcie_device *pcie = to_pcie_device(device);
 385
 386                 if (pcie->port->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)
 387                         result->is_downstream = 1;
 388
 389                 driver = device->driver;
 390                 if (driver) {
 391                         service_driver = to_service_driver(driver);
 392                         if (service_driver->service == PCIE_PORT_SERVICE_AER) {
 393                                 result->aer_driver = service_driver;
 394                                 return 1;
 395                         }
 396                 }
 397         }
 398
 399         return 0;
 400 }
 401
 402 static void find_aer_service(struct pci_dev *dev,
 403                 struct find_aer_service_data *data)
 404 {
 405         int retval;
 406         retval = device_for_each_child(&dev->dev, data, find_aer_service_iter);
 407 }
 408
 409 static pci_ers_result_t reset_link(struct pcie_device *aerdev,
 410                 struct pci_dev *dev)
 411 {
 412         struct pci_dev *udev;
 413         pci_ers_result_t status;
 414         struct find_aer_service_data data;
 415
 416         if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)
 417                 udev = dev;
 418         else
 419                 udev = dev->bus->self;
 420
 421         data.is_downstream = 0;
 422         data.aer_driver = NULL;
 423         find_aer_service(udev, &data);
 424
 425         /*
 426          * Use the aer driver of the error agent firstly.
 427          * If it hasn't the aer driver, use the root port's
 428          */
 429         if (!data.aer_driver || !data.aer_driver->reset_link) {
 430                 if (data.is_downstream &&
 431                         aerdev->device.driver &&
 432                         to_service_driver(aerdev->device.driver)->reset_link) {
 433                         data.aer_driver =
 434                                 to_service_driver(aerdev->device.driver);
 435                 } else {
 436                         dev_printk(KERN_DEBUG, &dev->dev, "no link-reset "
 437                                    "support\n");
 438                         return PCI_ERS_RESULT_DISCONNECT;
 439                 }
 440         }
 441
 442         status = data.aer_driver->reset_link(udev);
 443         if (status != PCI_ERS_RESULT_RECOVERED) {
 444                 dev_printk(KERN_DEBUG, &dev->dev, "link reset at upstream "
 445                            "device %s failed\n", pci_name(udev));
 446                 return PCI_ERS_RESULT_DISCONNECT;
 447         }
 448
 449         return status;
 450 }
 451
 452 /**
 453  * do_recovery - handle nonfatal/fatal error recovery process
 454  * @aerdev: pointer to a pcie_device data structure of root port
 455  * @dev: pointer to a pci_dev data structure of agent detecting an error
 456  * @severity: error severity type
 457  *
 458  * Invoked when an error is nonfatal/fatal. Once being invoked, broadcast
 459  * error detected message to all downstream drivers within a hierarchy in
 460  * question and return the returned code.
 461  */
 462 static pci_ers_result_t do_recovery(struct pcie_device *aerdev,
 463                 struct pci_dev *dev,
 464                 int severity)
 465 {
 466         pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED;
 467         enum pci_channel_state state;
 468
 469         if (severity == AER_FATAL)
 470                 state = pci_channel_io_frozen;
 471         else
 472                 state = pci_channel_io_normal;
 473
 474         status = broadcast_error_message(dev,
 475                         state,
 476                         "error_detected",
 477                         report_error_detected);
 478
 479         if (severity == AER_FATAL) {
 480                 result = reset_link(aerdev, dev);
 481                 if (result != PCI_ERS_RESULT_RECOVERED) {
 482                         /* TODO: Should panic here? */
 483                         return result;
 484                 }
 485         }
 486
 487         if (status == PCI_ERS_RESULT_CAN_RECOVER)
 488                 status = broadcast_error_message(dev,
 489                                 state,
 490                                 "mmio_enabled",
 491                                 report_mmio_enabled);
 492
 493         if (status == PCI_ERS_RESULT_NEED_RESET) {
 494                 /*
 495                  * TODO: Should call platform-specific
 496                  * functions to reset slot before calling
 497                  * drivers' slot_reset callbacks?
 498                  */
 499                 status = broadcast_error_message(dev,
 500                                 state,
 501                                 "slot_reset",
 502                                 report_slot_reset);
 503         }
 504
 505         if (status == PCI_ERS_RESULT_RECOVERED)
 506                 broadcast_error_message(dev,
 507                                 state,
 508                                 "resume",
 509                                 report_resume);
 510
 511         return status;
 512 }
 513
 514 /**
 515  * handle_error_source - handle logging error into an event log
 516  * @aerdev: pointer to pcie_device data structure of the root port
 517  * @dev: pointer to pci_dev data structure of error source device
 518  * @info: comprehensive error information
 519  *
 520  * Invoked when an error being detected by Root Port.
 521  */
 522 static void handle_error_source(struct pcie_device *aerdev,
 523         struct pci_dev *dev,
 524         struct aer_err_info *info)
 525 {
 526         pci_ers_result_t status = 0;
 527         int pos;
 528
 529         if (info->severity == AER_CORRECTABLE) {
 530                 /*
 531                  * Correctable error does not need software intevention.
 532                  * No need to go through error recovery process.
 533                  */
 534                 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 535                 if (pos)
 536                         pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 537                                         info->status);
 538         } else {
 539                 status = do_recovery(aerdev, dev, info->severity);
 540                 if (status == PCI_ERS_RESULT_RECOVERED) {
 541                         dev_printk(KERN_DEBUG, &dev->dev, "AER driver "
 542                                    "successfully recovered\n");
 543                 } else {
 544                         /* TODO: Should kernel panic here? */
 545                         dev_printk(KERN_DEBUG, &dev->dev, "AER driver didn't "
 546                                    "recover\n");
 547                 }
 548         }
 549 }
 550
 551 /**
 552  * get_e_source - retrieve an error source
 553  * @rpc: pointer to the root port which holds an error
 554  *
 555  * Invoked by DPC handler to consume an error.
 556  */
 557 static struct aer_err_source *get_e_source(struct aer_rpc *rpc)
 558 {
 559         struct aer_err_source *e_source;
 560         unsigned long flags;
 561
 562         /* Lock access to Root error producer/consumer index */
 563         spin_lock_irqsave(&rpc->e_lock, flags);
 564         if (rpc->prod_idx == rpc->cons_idx) {
 565                 spin_unlock_irqrestore(&rpc->e_lock, flags);
 566                 return NULL;
 567         }
 568         e_source = &rpc->e_sources[rpc->cons_idx];
 569         rpc->cons_idx++;
 570         if (rpc->cons_idx == AER_ERROR_SOURCES_MAX)
 571                 rpc->cons_idx = 0;
 572         spin_unlock_irqrestore(&rpc->e_lock, flags);
 573
 574         return e_source;
 575 }
 576
 577 /**
 578  * get_device_error_info - read error status from dev and store it to info
 579  * @dev: pointer to the device expected to have a error record
 580  * @info: pointer to structure to store the error record
 581  *
 582  * Return 1 on success, 0 on error.
 583  */
 584 static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
 585 {
 586         int pos, temp;
 587
 588         info->status = 0;
 589         info->tlp_header_valid = 0;
 590
 591         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 592
 593         /* The device might not support AER */
 594         if (!pos)
 595                 return 1;
 596
 597         if (info->severity == AER_CORRECTABLE) {
 598                 pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 599                         &info->status);
 600                 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK,
 601                         &info->mask);
 602                 if (!(info->status & ~info->mask))
 603                         return 0;
 604         } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE ||
 605                 info->severity == AER_NONFATAL) {
 606
 607                 /* Link is still healthy for IO reads */
 608                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
 609                         &info->status);
 610                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK,
 611                         &info->mask);
 612                 if (!(info->status & ~info->mask))
 613                         return 0;
 614
 615                 /* Get First Error Pointer */
 616                 pci_read_config_dword(dev, pos + PCI_ERR_CAP, &temp);
 617                 info->first_error = PCI_ERR_CAP_FEP(temp);
 618
 619                 if (info->status & AER_LOG_TLP_MASKS) {
 620                         info->tlp_header_valid = 1;
 621                         pci_read_config_dword(dev,
 622                                 pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0);
 623                         pci_read_config_dword(dev,
 624                                 pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1);
 625                         pci_read_config_dword(dev,
 626                                 pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2);
 627                         pci_read_config_dword(dev,
 628                                 pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3);
 629                 }
 630         }
 631
 632         return 1;
 633 }
 634
 635 static inline void aer_process_err_devices(struct pcie_device *p_device,
 636                         struct aer_err_info *e_info)
 637 {
 638         int i;
 639
 640         /* Report all before handle them, not to lost records by reset etc. */
 641         for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
 642                 if (get_device_error_info(e_info->dev[i], e_info))
 643                         aer_print_error(e_info->dev[i], e_info);
 644         }
 645         for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
 646                 if (get_device_error_info(e_info->dev[i], e_info))
 647                         handle_error_source(p_device, e_info->dev[i], e_info);
 648         }
 649 }
 650
 651 /**
 652  * aer_isr_one_error - consume an error detected by root port
 653  * @p_device: pointer to error root port service device
 654  * @e_src: pointer to an error source
 655  */
 656 static void aer_isr_one_error(struct pcie_device *p_device,
 657                 struct aer_err_source *e_src)
 658 {
 659         struct aer_err_info *e_info;
 660         int i;
 661
 662         /* struct aer_err_info might be big, so we allocate it with slab */
 663         e_info = kmalloc(sizeof(struct aer_err_info), GFP_KERNEL);
 664         if (e_info == NULL) {
 665                 dev_printk(KERN_DEBUG, &p_device->port->dev,
 666                         "Can't allocate mem when processing AER errors\n");
 667                 return;
 668         }
 669
 670         /*
 671          * There is a possibility that both correctable error and
 672          * uncorrectable error being logged. Report correctable error first.
 673          */
 674         for (i = 1; i & ROOT_ERR_STATUS_MASKS ; i <<= 2) {
 675                 if (i > 4)
 676                         break;
 677                 if (!(e_src->status & i))
 678                         continue;
 679
 680                 memset(e_info, 0, sizeof(struct aer_err_info));
 681
 682                 /* Init comprehensive error information */
 683                 if (i & PCI_ERR_ROOT_COR_RCV) {
 684                         e_info->id = ERR_COR_ID(e_src->id);
 685                         e_info->severity = AER_CORRECTABLE;
 686                 } else {
 687                         e_info->id = ERR_UNCOR_ID(e_src->id);
 688                         e_info->severity = ((e_src->status >> 6) & 1);
 689                 }
 690                 if (e_src->status &
 691                         (PCI_ERR_ROOT_MULTI_COR_RCV |
 692                          PCI_ERR_ROOT_MULTI_UNCOR_RCV))
 693                         e_info->multi_error_valid = 1;
 694
 695                 aer_print_port_info(p_device->port, e_info);
 696
 697                 if (find_source_device(p_device->port, e_info))
 698                         aer_process_err_devices(p_device, e_info);
 699         }
 700
 701         kfree(e_info);
 702 }
 703
 704 /**
 705  * aer_isr - consume errors detected by root port
 706  * @work: definition of this work item
 707  *
 708  * Invoked, as DPC, when root port records new detected error
 709  */
 710 void aer_isr(struct work_struct *work)
 711 {
 712         struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler);
 713         struct pcie_device *p_device = rpc->rpd;
 714         struct aer_err_source *e_src;
 715
 716         mutex_lock(&rpc->rpc_mutex);
 717         e_src = get_e_source(rpc);
 718         while (e_src) {
 719                 aer_isr_one_error(p_device, e_src);
 720                 e_src = get_e_source(rpc);
 721         }
 722         mutex_unlock(&rpc->rpc_mutex);
 723
 724         wake_up(&rpc->wait_release);
 725 }
 726
 727 /**
 728  * aer_init - provide AER initialization
 729  * @dev: pointer to AER pcie device
 730  *
 731  * Invoked when AER service driver is loaded.
 732  */
 733 int aer_init(struct pcie_device *dev)
 734 {
 735         if (dev->port->aer_firmware_first) {
 736                 dev_printk(KERN_DEBUG, &dev->device,
 737                            "PCIe errors handled by platform firmware.\n");
 738                 goto out;
 739         }
 740
 741         if (aer_osc_setup(dev))
 742                 goto out;
 743
 744         return 0;
 745 out:
 746         if (forceload) {
 747                 dev_printk(KERN_DEBUG, &dev->device,
 748                            "aerdrv forceload requested.\n");
 749                 dev->port->aer_firmware_first = 0;
 750                 return 0;
 751         }
 752         return -ENXIO;
 753 }