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 static inline int compare_device_id(struct pci_dev *dev,
 103                         struct aer_err_info *e_info)
 104 {
 105         if (e_info->id == ((dev->bus->number << 8) | dev->devfn)) {
 106                 /*
 107                  * Device ID match
 108                  */
 109                 return 1;
 110         }
 111
 112         return 0;
 113 }
 114
 115 static int add_error_device(struct aer_err_info *e_info, struct pci_dev *dev)
 116 {
 117         if (e_info->error_dev_num < AER_MAX_MULTI_ERR_DEVICES) {
 118                 e_info->dev[e_info->error_dev_num] = dev;
 119                 e_info->error_dev_num++;
 120                 return 1;
 121         }
 122
 123         return 0;
 124 }
 125
 126
 127 #define PCI_BUS(x)      (((x) >> 8) & 0xff)
 128
 129 static int find_device_iter(struct pci_dev *dev, void *data)
 130 {
 131         int pos;
 132         u32 status;
 133         u32 mask;
 134         u16 reg16;
 135         int result;
 136         struct aer_err_info *e_info = (struct aer_err_info *)data;
 137
 138         /*
 139          * When bus id is equal to 0, it might be a bad id
 140          * reported by root port.
 141          */
 142         if (!nosourceid && (PCI_BUS(e_info->id) != 0)) {
 143                 result = compare_device_id(dev, e_info);
 144                 if (result)
 145                         add_error_device(e_info, dev);
 146
 147                 /*
 148                  * If there is no multiple error, we stop
 149                  * or continue based on the id comparing.
 150                  */
 151                 if (!e_info->multi_error_valid)
 152                         return result;
 153
 154                 /*
 155                  * If there are multiple errors and id does match,
 156                  * We need continue to search other devices under
 157                  * the root port. Return 0 means that.
 158                  */
 159                 if (result)
 160                         return 0;
 161         }
 162
 163         /*
 164          * When either
 165          *      1) nosourceid==y;
 166          *      2) bus id is equal to 0. Some ports might lose the bus
 167          *              id of error source id;
 168          *      3) There are multiple errors and prior id comparing fails;
 169          * We check AER status registers to find the initial reporter.
 170          */
 171         if (atomic_read(&dev->enable_cnt) == 0)
 172                 return 0;
 173         pos = pci_pcie_cap(dev);
 174         if (!pos)
 175                 return 0;
 176         /* Check if AER is enabled */
 177         pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, &reg16);
 178         if (!(reg16 & (
 179                 PCI_EXP_DEVCTL_CERE |
 180                 PCI_EXP_DEVCTL_NFERE |
 181                 PCI_EXP_DEVCTL_FERE |
 182                 PCI_EXP_DEVCTL_URRE)))
 183                 return 0;
 184         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 185         if (!pos)
 186                 return 0;
 187
 188         status = 0;
 189         mask = 0;
 190         if (e_info->severity == AER_CORRECTABLE) {
 191                 pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
 192                 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &mask);
 193                 if (status & ~mask) {
 194                         add_error_device(e_info, dev);
 195                         goto added;
 196                 }
 197         } else {
 198                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
 199                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &mask);
 200                 if (status & ~mask) {
 201                         add_error_device(e_info, dev);
 202                         goto added;
 203                 }
 204         }
 205
 206         return 0;
 207
 208 added:
 209         if (e_info->multi_error_valid)
 210                 return 0;
 211         else
 212                 return 1;
 213 }
 214
 215 /**
 216  * find_source_device - search through device hierarchy for source device
 217  * @parent: pointer to Root Port pci_dev data structure
 218  * @e_info: including detailed error information such like id
 219  *
 220  * Return true if found.
 221  *
 222  * Invoked by DPC when error is detected at the Root Port.
 223  */
 224 static bool find_source_device(struct pci_dev *parent,
 225                 struct aer_err_info *e_info)
 226 {
 227         struct pci_dev *dev = parent;
 228         int result;
 229
 230         /* Is Root Port an agent that sends error message? */
 231         result = find_device_iter(dev, e_info);
 232         if (result)
 233                 return true;
 234
 235         pci_walk_bus(parent->subordinate, find_device_iter, e_info);
 236
 237         if (!e_info->error_dev_num) {
 238                 dev_printk(KERN_DEBUG, &parent->dev,
 239                                 "can't find device of ID%04x\n",
 240                                 e_info->id);
 241                 return false;
 242         }
 243         return true;
 244 }
 245
 246 static int report_error_detected(struct pci_dev *dev, void *data)
 247 {
 248         pci_ers_result_t vote;
 249         struct pci_error_handlers *err_handler;
 250         struct aer_broadcast_data *result_data;
 251         result_data = (struct aer_broadcast_data *) data;
 252
 253         dev->error_state = result_data->state;
 254
 255         if (!dev->driver ||
 256                 !dev->driver->err_handler ||
 257                 !dev->driver->err_handler->error_detected) {
 258                 if (result_data->state == pci_channel_io_frozen &&
 259                         !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) {
 260                         /*
 261                          * In case of fatal recovery, if one of down-
 262                          * stream device has no driver. We might be
 263                          * unable to recover because a later insmod
 264                          * of a driver for this device is unaware of
 265                          * its hw state.
 266                          */
 267                         dev_printk(KERN_DEBUG, &dev->dev, "device has %s\n",
 268                                    dev->driver ?
 269                                    "no AER-aware driver" : "no driver");
 270                 }
 271                 return 0;
 272         }
 273
 274         err_handler = dev->driver->err_handler;
 275         vote = err_handler->error_detected(dev, result_data->state);
 276         result_data->result = merge_result(result_data->result, vote);
 277         return 0;
 278 }
 279
 280 static int report_mmio_enabled(struct pci_dev *dev, void *data)
 281 {
 282         pci_ers_result_t vote;
 283         struct pci_error_handlers *err_handler;
 284         struct aer_broadcast_data *result_data;
 285         result_data = (struct aer_broadcast_data *) data;
 286
 287         if (!dev->driver ||
 288                 !dev->driver->err_handler ||
 289                 !dev->driver->err_handler->mmio_enabled)
 290                 return 0;
 291
 292         err_handler = dev->driver->err_handler;
 293         vote = err_handler->mmio_enabled(dev);
 294         result_data->result = merge_result(result_data->result, vote);
 295         return 0;
 296 }
 297
 298 static int report_slot_reset(struct pci_dev *dev, void *data)
 299 {
 300         pci_ers_result_t vote;
 301         struct pci_error_handlers *err_handler;
 302         struct aer_broadcast_data *result_data;
 303         result_data = (struct aer_broadcast_data *) data;
 304
 305         if (!dev->driver ||
 306                 !dev->driver->err_handler ||
 307                 !dev->driver->err_handler->slot_reset)
 308                 return 0;
 309
 310         err_handler = dev->driver->err_handler;
 311         vote = err_handler->slot_reset(dev);
 312         result_data->result = merge_result(result_data->result, vote);
 313         return 0;
 314 }
 315
 316 static int report_resume(struct pci_dev *dev, void *data)
 317 {
 318         struct pci_error_handlers *err_handler;
 319
 320         dev->error_state = pci_channel_io_normal;
 321
 322         if (!dev->driver ||
 323                 !dev->driver->err_handler ||
 324                 !dev->driver->err_handler->resume)
 325                 return 0;
 326
 327         err_handler = dev->driver->err_handler;
 328         err_handler->resume(dev);
 329         return 0;
 330 }
 331
 332 /**
 333  * broadcast_error_message - handle message broadcast to downstream drivers
 334  * @dev: pointer to from where in a hierarchy message is broadcasted down
 335  * @state: error state
 336  * @error_mesg: message to print
 337  * @cb: callback to be broadcasted
 338  *
 339  * Invoked during error recovery process. Once being invoked, the content
 340  * of error severity will be broadcasted to all downstream drivers in a
 341  * hierarchy in question.
 342  */
 343 static pci_ers_result_t broadcast_error_message(struct pci_dev *dev,
 344         enum pci_channel_state state,
 345         char *error_mesg,
 346         int (*cb)(struct pci_dev *, void *))
 347 {
 348         struct aer_broadcast_data result_data;
 349
 350         dev_printk(KERN_DEBUG, &dev->dev, "broadcast %s message\n", error_mesg);
 351         result_data.state = state;
 352         if (cb == report_error_detected)
 353                 result_data.result = PCI_ERS_RESULT_CAN_RECOVER;
 354         else
 355                 result_data.result = PCI_ERS_RESULT_RECOVERED;
 356
 357         if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
 358                 /*
 359                  * If the error is reported by a bridge, we think this error
 360                  * is related to the downstream link of the bridge, so we
 361                  * do error recovery on all subordinates of the bridge instead
 362                  * of the bridge and clear the error status of the bridge.
 363                  */
 364                 if (cb == report_error_detected)
 365                         dev->error_state = state;
 366                 pci_walk_bus(dev->subordinate, cb, &result_data);
 367                 if (cb == report_resume) {
 368                         pci_cleanup_aer_uncorrect_error_status(dev);
 369                         dev->error_state = pci_channel_io_normal;
 370                 }
 371         } else {
 372                 /*
 373                  * If the error is reported by an end point, we think this
 374                  * error is related to the upstream link of the end point.
 375                  */
 376                 pci_walk_bus(dev->bus, cb, &result_data);
 377         }
 378
 379         return result_data.result;
 380 }
 381
 382 struct find_aer_service_data {
 383         struct pcie_port_service_driver *aer_driver;
 384         int is_downstream;
 385 };
 386
 387 static int find_aer_service_iter(struct device *device, void *data)
 388 {
 389         struct device_driver *driver;
 390         struct pcie_port_service_driver *service_driver;
 391         struct find_aer_service_data *result;
 392
 393         result = (struct find_aer_service_data *) data;
 394
 395         if (device->bus == &pcie_port_bus_type) {
 396                 struct pcie_device *pcie = to_pcie_device(device);
 397
 398                 if (pcie->port->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)
 399                         result->is_downstream = 1;
 400
 401                 driver = device->driver;
 402                 if (driver) {
 403                         service_driver = to_service_driver(driver);
 404                         if (service_driver->service == PCIE_PORT_SERVICE_AER) {
 405                                 result->aer_driver = service_driver;
 406                                 return 1;
 407                         }
 408                 }
 409         }
 410
 411         return 0;
 412 }
 413
 414 static void find_aer_service(struct pci_dev *dev,
 415                 struct find_aer_service_data *data)
 416 {
 417         int retval;
 418         retval = device_for_each_child(&dev->dev, data, find_aer_service_iter);
 419 }
 420
 421 static pci_ers_result_t reset_link(struct pcie_device *aerdev,
 422                 struct pci_dev *dev)
 423 {
 424         struct pci_dev *udev;
 425         pci_ers_result_t status;
 426         struct find_aer_service_data data;
 427
 428         if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)
 429                 udev = dev;
 430         else
 431                 udev = dev->bus->self;
 432
 433         data.is_downstream = 0;
 434         data.aer_driver = NULL;
 435         find_aer_service(udev, &data);
 436
 437         /*
 438          * Use the aer driver of the error agent firstly.
 439          * If it hasn't the aer driver, use the root port's
 440          */
 441         if (!data.aer_driver || !data.aer_driver->reset_link) {
 442                 if (data.is_downstream &&
 443                         aerdev->device.driver &&
 444                         to_service_driver(aerdev->device.driver)->reset_link) {
 445                         data.aer_driver =
 446                                 to_service_driver(aerdev->device.driver);
 447                 } else {
 448                         dev_printk(KERN_DEBUG, &dev->dev, "no link-reset "
 449                                    "support\n");
 450                         return PCI_ERS_RESULT_DISCONNECT;
 451                 }
 452         }
 453
 454         status = data.aer_driver->reset_link(udev);
 455         if (status != PCI_ERS_RESULT_RECOVERED) {
 456                 dev_printk(KERN_DEBUG, &dev->dev, "link reset at upstream "
 457                            "device %s failed\n", pci_name(udev));
 458                 return PCI_ERS_RESULT_DISCONNECT;
 459         }
 460
 461         return status;
 462 }
 463
 464 /**
 465  * do_recovery - handle nonfatal/fatal error recovery process
 466  * @aerdev: pointer to a pcie_device data structure of root port
 467  * @dev: pointer to a pci_dev data structure of agent detecting an error
 468  * @severity: error severity type
 469  *
 470  * Invoked when an error is nonfatal/fatal. Once being invoked, broadcast
 471  * error detected message to all downstream drivers within a hierarchy in
 472  * question and return the returned code.
 473  */
 474 static pci_ers_result_t do_recovery(struct pcie_device *aerdev,
 475                 struct pci_dev *dev,
 476                 int severity)
 477 {
 478         pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED;
 479         enum pci_channel_state state;
 480
 481         if (severity == AER_FATAL)
 482                 state = pci_channel_io_frozen;
 483         else
 484                 state = pci_channel_io_normal;
 485
 486         status = broadcast_error_message(dev,
 487                         state,
 488                         "error_detected",
 489                         report_error_detected);
 490
 491         if (severity == AER_FATAL) {
 492                 result = reset_link(aerdev, dev);
 493                 if (result != PCI_ERS_RESULT_RECOVERED) {
 494                         /* TODO: Should panic here? */
 495                         return result;
 496                 }
 497         }
 498
 499         if (status == PCI_ERS_RESULT_CAN_RECOVER)
 500                 status = broadcast_error_message(dev,
 501                                 state,
 502                                 "mmio_enabled",
 503                                 report_mmio_enabled);
 504
 505         if (status == PCI_ERS_RESULT_NEED_RESET) {
 506                 /*
 507                  * TODO: Should call platform-specific
 508                  * functions to reset slot before calling
 509                  * drivers' slot_reset callbacks?
 510                  */
 511                 status = broadcast_error_message(dev,
 512                                 state,
 513                                 "slot_reset",
 514                                 report_slot_reset);
 515         }
 516
 517         if (status == PCI_ERS_RESULT_RECOVERED)
 518                 broadcast_error_message(dev,
 519                                 state,
 520                                 "resume",
 521                                 report_resume);
 522
 523         return status;
 524 }
 525
 526 /**
 527  * handle_error_source - handle logging error into an event log
 528  * @aerdev: pointer to pcie_device data structure of the root port
 529  * @dev: pointer to pci_dev data structure of error source device
 530  * @info: comprehensive error information
 531  *
 532  * Invoked when an error being detected by Root Port.
 533  */
 534 static void handle_error_source(struct pcie_device *aerdev,
 535         struct pci_dev *dev,
 536         struct aer_err_info *info)
 537 {
 538         pci_ers_result_t status = 0;
 539         int pos;
 540
 541         if (info->severity == AER_CORRECTABLE) {
 542                 /*
 543                  * Correctable error does not need software intevention.
 544                  * No need to go through error recovery process.
 545                  */
 546                 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 547                 if (pos)
 548                         pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 549                                         info->status);
 550         } else {
 551                 status = do_recovery(aerdev, dev, info->severity);
 552                 if (status == PCI_ERS_RESULT_RECOVERED) {
 553                         dev_printk(KERN_DEBUG, &dev->dev, "AER driver "
 554                                    "successfully recovered\n");
 555                 } else {
 556                         /* TODO: Should kernel panic here? */
 557                         dev_printk(KERN_DEBUG, &dev->dev, "AER driver didn't "
 558                                    "recover\n");
 559                 }
 560         }
 561 }
 562
 563 /**
 564  * get_e_source - retrieve an error source
 565  * @rpc: pointer to the root port which holds an error
 566  *
 567  * Invoked by DPC handler to consume an error.
 568  */
 569 static struct aer_err_source *get_e_source(struct aer_rpc *rpc)
 570 {
 571         struct aer_err_source *e_source;
 572         unsigned long flags;
 573
 574         /* Lock access to Root error producer/consumer index */
 575         spin_lock_irqsave(&rpc->e_lock, flags);
 576         if (rpc->prod_idx == rpc->cons_idx) {
 577                 spin_unlock_irqrestore(&rpc->e_lock, flags);
 578                 return NULL;
 579         }
 580         e_source = &rpc->e_sources[rpc->cons_idx];
 581         rpc->cons_idx++;
 582         if (rpc->cons_idx == AER_ERROR_SOURCES_MAX)
 583                 rpc->cons_idx = 0;
 584         spin_unlock_irqrestore(&rpc->e_lock, flags);
 585
 586         return e_source;
 587 }
 588
 589 /**
 590  * get_device_error_info - read error status from dev and store it to info
 591  * @dev: pointer to the device expected to have a error record
 592  * @info: pointer to structure to store the error record
 593  *
 594  * Return 1 on success, 0 on error.
 595  */
 596 static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
 597 {
 598         int pos, temp;
 599
 600         info->status = 0;
 601         info->tlp_header_valid = 0;
 602
 603         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 604
 605         /* The device might not support AER */
 606         if (!pos)
 607                 return 1;
 608
 609         if (info->severity == AER_CORRECTABLE) {
 610                 pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 611                         &info->status);
 612                 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK,
 613                         &info->mask);
 614                 if (!(info->status & ~info->mask))
 615                         return 0;
 616         } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE ||
 617                 info->severity == AER_NONFATAL) {
 618
 619                 /* Link is still healthy for IO reads */
 620                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
 621                         &info->status);
 622                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK,
 623                         &info->mask);
 624                 if (!(info->status & ~info->mask))
 625                         return 0;
 626
 627                 /* Get First Error Pointer */
 628                 pci_read_config_dword(dev, pos + PCI_ERR_CAP, &temp);
 629                 info->first_error = PCI_ERR_CAP_FEP(temp);
 630
 631                 if (info->status & AER_LOG_TLP_MASKS) {
 632                         info->tlp_header_valid = 1;
 633                         pci_read_config_dword(dev,
 634                                 pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0);
 635                         pci_read_config_dword(dev,
 636                                 pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1);
 637                         pci_read_config_dword(dev,
 638                                 pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2);
 639                         pci_read_config_dword(dev,
 640                                 pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3);
 641                 }
 642         }
 643
 644         return 1;
 645 }
 646
 647 static inline void aer_process_err_devices(struct pcie_device *p_device,
 648                         struct aer_err_info *e_info)
 649 {
 650         int i;
 651
 652         /* Report all before handle them, not to lost records by reset etc. */
 653         for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
 654                 if (get_device_error_info(e_info->dev[i], e_info))
 655                         aer_print_error(e_info->dev[i], e_info);
 656         }
 657         for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
 658                 if (get_device_error_info(e_info->dev[i], e_info))
 659                         handle_error_source(p_device, e_info->dev[i], e_info);
 660         }
 661 }
 662
 663 /**
 664  * aer_isr_one_error - consume an error detected by root port
 665  * @p_device: pointer to error root port service device
 666  * @e_src: pointer to an error source
 667  */
 668 static void aer_isr_one_error(struct pcie_device *p_device,
 669                 struct aer_err_source *e_src)
 670 {
 671         struct aer_err_info *e_info;
 672         int i;
 673
 674         /* struct aer_err_info might be big, so we allocate it with slab */
 675         e_info = kmalloc(sizeof(struct aer_err_info), GFP_KERNEL);
 676         if (e_info == NULL) {
 677                 dev_printk(KERN_DEBUG, &p_device->port->dev,
 678                         "Can't allocate mem when processing AER errors\n");
 679                 return;
 680         }
 681
 682         /*
 683          * There is a possibility that both correctable error and
 684          * uncorrectable error being logged. Report correctable error first.
 685          */
 686         for (i = 1; i & ROOT_ERR_STATUS_MASKS ; i <<= 2) {
 687                 if (i > 4)
 688                         break;
 689                 if (!(e_src->status & i))
 690                         continue;
 691
 692                 memset(e_info, 0, sizeof(struct aer_err_info));
 693
 694                 /* Init comprehensive error information */
 695                 if (i & PCI_ERR_ROOT_COR_RCV) {
 696                         e_info->id = ERR_COR_ID(e_src->id);
 697                         e_info->severity = AER_CORRECTABLE;
 698                 } else {
 699                         e_info->id = ERR_UNCOR_ID(e_src->id);
 700                         e_info->severity = ((e_src->status >> 6) & 1);
 701                 }
 702                 if (e_src->status &
 703                         (PCI_ERR_ROOT_MULTI_COR_RCV |
 704                          PCI_ERR_ROOT_MULTI_UNCOR_RCV))
 705                         e_info->multi_error_valid = 1;
 706
 707                 aer_print_port_info(p_device->port, e_info);
 708
 709                 if (find_source_device(p_device->port, e_info))
 710                         aer_process_err_devices(p_device, e_info);
 711         }
 712
 713         kfree(e_info);
 714 }
 715
 716 /**
 717  * aer_isr - consume errors detected by root port
 718  * @work: definition of this work item
 719  *
 720  * Invoked, as DPC, when root port records new detected error
 721  */
 722 void aer_isr(struct work_struct *work)
 723 {
 724         struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler);
 725         struct pcie_device *p_device = rpc->rpd;
 726         struct aer_err_source *e_src;
 727
 728         mutex_lock(&rpc->rpc_mutex);
 729         e_src = get_e_source(rpc);
 730         while (e_src) {
 731                 aer_isr_one_error(p_device, e_src);
 732                 e_src = get_e_source(rpc);
 733         }
 734         mutex_unlock(&rpc->rpc_mutex);
 735
 736         wake_up(&rpc->wait_release);
 737 }
 738
 739 /**
 740  * aer_init - provide AER initialization
 741  * @dev: pointer to AER pcie device
 742  *
 743  * Invoked when AER service driver is loaded.
 744  */
 745 int aer_init(struct pcie_device *dev)
 746 {
 747         if (dev->port->aer_firmware_first) {
 748                 dev_printk(KERN_DEBUG, &dev->device,
 749                            "PCIe errors handled by platform firmware.\n");
 750                 goto out;
 751         }
 752
 753         if (aer_osc_setup(dev))
 754                 goto out;
 755
 756         return 0;
 757 out:
 758         if (forceload) {
 759                 dev_printk(KERN_DEBUG, &dev->device,
 760                            "aerdrv forceload requested.\n");
 761                 dev->port->aer_firmware_first = 0;
 762                 return 0;
 763         }
 764         return -ENXIO;
 765 }