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 "aerdrv.h"
  27
  28 static int forceload;
  29 module_param(forceload, bool, 0);
  30
  31 int pci_enable_pcie_error_reporting(struct pci_dev *dev)
  32 {
  33         u16 reg16 = 0;
  34         int pos;
  35
  36         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
  37         if (!pos)
  38                 return -EIO;
  39
  40         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
  41         if (!pos)
  42                 return -EIO;
  43
  44         pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, &reg16);
  45         reg16 = reg16 |
  46                 PCI_EXP_DEVCTL_CERE |
  47                 PCI_EXP_DEVCTL_NFERE |
  48                 PCI_EXP_DEVCTL_FERE |
  49                 PCI_EXP_DEVCTL_URRE;
  50         pci_write_config_word(dev, pos+PCI_EXP_DEVCTL,
  51                         reg16);
  52         return 0;
  53 }
  54
  55 int pci_disable_pcie_error_reporting(struct pci_dev *dev)
  56 {
  57         u16 reg16 = 0;
  58         int pos;
  59
  60         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
  61         if (!pos)
  62                 return -EIO;
  63
  64         pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, &reg16);
  65         reg16 = reg16 & ~(PCI_EXP_DEVCTL_CERE |
  66                         PCI_EXP_DEVCTL_NFERE |
  67                         PCI_EXP_DEVCTL_FERE |
  68                         PCI_EXP_DEVCTL_URRE);
  69         pci_write_config_word(dev, pos+PCI_EXP_DEVCTL,
  70                         reg16);
  71         return 0;
  72 }
  73
  74 int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
  75 {
  76         int pos;
  77         u32 status, mask;
  78
  79         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
  80         if (!pos)
  81                 return -EIO;
  82
  83         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
  84         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
  85         if (dev->error_state == pci_channel_io_normal)
  86                 status &= ~mask; /* Clear corresponding nonfatal bits */
  87         else
  88                 status &= mask; /* Clear corresponding fatal bits */
  89         pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
  90
  91         return 0;
  92 }
  93
  94 #if 0
  95 int pci_cleanup_aer_correct_error_status(struct pci_dev *dev)
  96 {
  97         int pos;
  98         u32 status;
  99
 100         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 101         if (!pos)
 102                 return -EIO;
 103
 104         pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
 105         pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, status);
 106
 107         return 0;
 108 }
 109 #endif  /*  0  */
 110
 111
 112 static void set_device_error_reporting(struct pci_dev *dev, void *data)
 113 {
 114         bool enable = *((bool *)data);
 115
 116         if (dev->pcie_type != PCIE_RC_PORT &&
 117             dev->pcie_type != PCIE_SW_UPSTREAM_PORT &&
 118             dev->pcie_type != PCIE_SW_DOWNSTREAM_PORT)
 119                 return;
 120
 121         if (enable)
 122                 pci_enable_pcie_error_reporting(dev);
 123         else
 124                 pci_disable_pcie_error_reporting(dev);
 125 }
 126
 127 /**
 128  * set_downstream_devices_error_reporting - enable/disable the error reporting  bits on the root port and its downstream ports.
 129  * @dev: pointer to root port's pci_dev data structure
 130  * @enable: true = enable error reporting, false = disable error reporting.
 131  */
 132 static void set_downstream_devices_error_reporting(struct pci_dev *dev,
 133                                                    bool enable)
 134 {
 135         set_device_error_reporting(dev, &enable);
 136
 137         if (!dev->subordinate)
 138                 return;
 139         pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable);
 140 }
 141
 142 static int find_device_iter(struct device *device, void *data)
 143 {
 144         struct pci_dev *dev;
 145         u16 id = *(unsigned long *)data;
 146         u8 secondary, subordinate, d_bus = id >> 8;
 147
 148         if (device->bus == &pci_bus_type) {
 149                 dev = to_pci_dev(device);
 150                 if (id == ((dev->bus->number << 8) | dev->devfn)) {
 151                         /*
 152                          * Device ID match
 153                          */
 154                         *(unsigned long*)data = (unsigned long)device;
 155                         return 1;
 156                 }
 157
 158                 /*
 159                  * If device is P2P, check if it is an upstream?
 160                  */
 161                 if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
 162                         pci_read_config_byte(dev, PCI_SECONDARY_BUS,
 163                                 &secondary);
 164                         pci_read_config_byte(dev, PCI_SUBORDINATE_BUS,
 165                                 &subordinate);
 166                         if (d_bus >= secondary && d_bus <= subordinate) {
 167                                 *(unsigned long*)data = (unsigned long)device;
 168                                 return 1;
 169                         }
 170                 }
 171         }
 172
 173         return 0;
 174 }
 175
 176 /**
 177  * find_source_device - search through device hierarchy for source device
 178  * @parent: pointer to Root Port pci_dev data structure
 179  * @id: device ID of agent who sends an error message to this Root Port
 180  *
 181  * Invoked when error is detected at the Root Port.
 182  */
 183 static struct device* find_source_device(struct pci_dev *parent, u16 id)
 184 {
 185         struct pci_dev *dev = parent;
 186         struct device *device;
 187         unsigned long device_addr;
 188         int status;
 189
 190         /* Is Root Port an agent that sends error message? */
 191         if (id == ((dev->bus->number << 8) | dev->devfn))
 192                 return &dev->dev;
 193
 194         do {
 195                 device_addr = id;
 196                 if ((status = device_for_each_child(&dev->dev,
 197                         &device_addr, find_device_iter))) {
 198                         device = (struct device*)device_addr;
 199                         dev = to_pci_dev(device);
 200                         if (id == ((dev->bus->number << 8) | dev->devfn))
 201                                 return device;
 202                 }
 203         }while (status);
 204
 205         return NULL;
 206 }
 207
 208 static void report_error_detected(struct pci_dev *dev, void *data)
 209 {
 210         pci_ers_result_t vote;
 211         struct pci_error_handlers *err_handler;
 212         struct aer_broadcast_data *result_data;
 213         result_data = (struct aer_broadcast_data *) data;
 214
 215         dev->error_state = result_data->state;
 216
 217         if (!dev->driver ||
 218                 !dev->driver->err_handler ||
 219                 !dev->driver->err_handler->error_detected) {
 220                 if (result_data->state == pci_channel_io_frozen &&
 221                         !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) {
 222                         /*
 223                          * In case of fatal recovery, if one of down-
 224                          * stream device has no driver. We might be
 225                          * unable to recover because a later insmod
 226                          * of a driver for this device is unaware of
 227                          * its hw state.
 228                          */
 229                         dev_printk(KERN_DEBUG, &dev->dev, "device has %s\n",
 230                                    dev->driver ?
 231                                    "no AER-aware driver" : "no driver");
 232                 }
 233                 return;
 234         }
 235
 236         err_handler = dev->driver->err_handler;
 237         vote = err_handler->error_detected(dev, result_data->state);
 238         result_data->result = merge_result(result_data->result, vote);
 239         return;
 240 }
 241
 242 static void report_mmio_enabled(struct pci_dev *dev, void *data)
 243 {
 244         pci_ers_result_t vote;
 245         struct pci_error_handlers *err_handler;
 246         struct aer_broadcast_data *result_data;
 247         result_data = (struct aer_broadcast_data *) data;
 248
 249         if (!dev->driver ||
 250                 !dev->driver->err_handler ||
 251                 !dev->driver->err_handler->mmio_enabled)
 252                 return;
 253
 254         err_handler = dev->driver->err_handler;
 255         vote = err_handler->mmio_enabled(dev);
 256         result_data->result = merge_result(result_data->result, vote);
 257         return;
 258 }
 259
 260 static void report_slot_reset(struct pci_dev *dev, void *data)
 261 {
 262         pci_ers_result_t vote;
 263         struct pci_error_handlers *err_handler;
 264         struct aer_broadcast_data *result_data;
 265         result_data = (struct aer_broadcast_data *) data;
 266
 267         if (!dev->driver ||
 268                 !dev->driver->err_handler ||
 269                 !dev->driver->err_handler->slot_reset)
 270                 return;
 271
 272         err_handler = dev->driver->err_handler;
 273         vote = err_handler->slot_reset(dev);
 274         result_data->result = merge_result(result_data->result, vote);
 275         return;
 276 }
 277
 278 static void report_resume(struct pci_dev *dev, void *data)
 279 {
 280         struct pci_error_handlers *err_handler;
 281
 282         dev->error_state = pci_channel_io_normal;
 283
 284         if (!dev->driver ||
 285                 !dev->driver->err_handler ||
 286                 !dev->driver->err_handler->resume)
 287                 return;
 288
 289         err_handler = dev->driver->err_handler;
 290         err_handler->resume(dev);
 291         return;
 292 }
 293
 294 /**
 295  * broadcast_error_message - handle message broadcast to downstream drivers
 296  * @dev: pointer to from where in a hierarchy message is broadcasted down
 297  * @state: error state
 298  * @error_mesg: message to print
 299  * @cb: callback to be broadcasted
 300  *
 301  * Invoked during error recovery process. Once being invoked, the content
 302  * of error severity will be broadcasted to all downstream drivers in a
 303  * hierarchy in question.
 304  */
 305 static pci_ers_result_t broadcast_error_message(struct pci_dev *dev,
 306         enum pci_channel_state state,
 307         char *error_mesg,
 308         void (*cb)(struct pci_dev *, void *))
 309 {
 310         struct aer_broadcast_data result_data;
 311
 312         dev_printk(KERN_DEBUG, &dev->dev, "broadcast %s message\n", error_mesg);
 313         result_data.state = state;
 314         if (cb == report_error_detected)
 315                 result_data.result = PCI_ERS_RESULT_CAN_RECOVER;
 316         else
 317                 result_data.result = PCI_ERS_RESULT_RECOVERED;
 318
 319         if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
 320                 /*
 321                  * If the error is reported by a bridge, we think this error
 322                  * is related to the downstream link of the bridge, so we
 323                  * do error recovery on all subordinates of the bridge instead
 324                  * of the bridge and clear the error status of the bridge.
 325                  */
 326                 if (cb == report_error_detected)
 327                         dev->error_state = state;
 328                 pci_walk_bus(dev->subordinate, cb, &result_data);
 329                 if (cb == report_resume) {
 330                         pci_cleanup_aer_uncorrect_error_status(dev);
 331                         dev->error_state = pci_channel_io_normal;
 332                 }
 333         }
 334         else {
 335                 /*
 336                  * If the error is reported by an end point, we think this
 337                  * error is related to the upstream link of the end point.
 338                  */
 339                 pci_walk_bus(dev->bus, cb, &result_data);
 340         }
 341
 342         return result_data.result;
 343 }
 344
 345 struct find_aer_service_data {
 346         struct pcie_port_service_driver *aer_driver;
 347         int is_downstream;
 348 };
 349
 350 static int find_aer_service_iter(struct device *device, void *data)
 351 {
 352         struct device_driver *driver;
 353         struct pcie_port_service_driver *service_driver;
 354         struct pcie_device *pcie_dev;
 355         struct find_aer_service_data *result;
 356
 357         result = (struct find_aer_service_data *) data;
 358
 359         if (device->bus == &pcie_port_bus_type) {
 360                 pcie_dev = to_pcie_device(device);
 361                 if (pcie_dev->id.port_type == PCIE_SW_DOWNSTREAM_PORT)
 362                         result->is_downstream = 1;
 363
 364                 driver = device->driver;
 365                 if (driver) {
 366                         service_driver = to_service_driver(driver);
 367                         if (service_driver->id_table->service_type ==
 368                                         PCIE_PORT_SERVICE_AER) {
 369                                 result->aer_driver = service_driver;
 370                                 return 1;
 371                         }
 372                 }
 373         }
 374
 375         return 0;
 376 }
 377
 378 static void find_aer_service(struct pci_dev *dev,
 379                 struct find_aer_service_data *data)
 380 {
 381         int retval;
 382         retval = device_for_each_child(&dev->dev, data, find_aer_service_iter);
 383 }
 384
 385 static pci_ers_result_t reset_link(struct pcie_device *aerdev,
 386                 struct pci_dev *dev)
 387 {
 388         struct pci_dev *udev;
 389         pci_ers_result_t status;
 390         struct find_aer_service_data data;
 391
 392         if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)
 393                 udev = dev;
 394         else
 395                 udev= dev->bus->self;
 396
 397         data.is_downstream = 0;
 398         data.aer_driver = NULL;
 399         find_aer_service(udev, &data);
 400
 401         /*
 402          * Use the aer driver of the error agent firstly.
 403          * If it hasn't the aer driver, use the root port's
 404          */
 405         if (!data.aer_driver || !data.aer_driver->reset_link) {
 406                 if (data.is_downstream &&
 407                         aerdev->device.driver &&
 408                         to_service_driver(aerdev->device.driver)->reset_link) {
 409                         data.aer_driver =
 410                                 to_service_driver(aerdev->device.driver);
 411                 } else {
 412                         dev_printk(KERN_DEBUG, &dev->dev, "no link-reset "
 413                                    "support\n");
 414                         return PCI_ERS_RESULT_DISCONNECT;
 415                 }
 416         }
 417
 418         status = data.aer_driver->reset_link(udev);
 419         if (status != PCI_ERS_RESULT_RECOVERED) {
 420                 dev_printk(KERN_DEBUG, &dev->dev, "link reset at upstream "
 421                            "device %s failed\n", pci_name(udev));
 422                 return PCI_ERS_RESULT_DISCONNECT;
 423         }
 424
 425         return status;
 426 }
 427
 428 /**
 429  * do_recovery - handle nonfatal/fatal error recovery process
 430  * @aerdev: pointer to a pcie_device data structure of root port
 431  * @dev: pointer to a pci_dev data structure of agent detecting an error
 432  * @severity: error severity type
 433  *
 434  * Invoked when an error is nonfatal/fatal. Once being invoked, broadcast
 435  * error detected message to all downstream drivers within a hierarchy in
 436  * question and return the returned code.
 437  */
 438 static pci_ers_result_t do_recovery(struct pcie_device *aerdev,
 439                 struct pci_dev *dev,
 440                 int severity)
 441 {
 442         pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED;
 443         enum pci_channel_state state;
 444
 445         if (severity == AER_FATAL)
 446                 state = pci_channel_io_frozen;
 447         else
 448                 state = pci_channel_io_normal;
 449
 450         status = broadcast_error_message(dev,
 451                         state,
 452                         "error_detected",
 453                         report_error_detected);
 454
 455         if (severity == AER_FATAL) {
 456                 result = reset_link(aerdev, dev);
 457                 if (result != PCI_ERS_RESULT_RECOVERED) {
 458                         /* TODO: Should panic here? */
 459                         return result;
 460                 }
 461         }
 462
 463         if (status == PCI_ERS_RESULT_CAN_RECOVER)
 464                 status = broadcast_error_message(dev,
 465                                 state,
 466                                 "mmio_enabled",
 467                                 report_mmio_enabled);
 468
 469         if (status == PCI_ERS_RESULT_NEED_RESET) {
 470                 /*
 471                  * TODO: Should call platform-specific
 472                  * functions to reset slot before calling
 473                  * drivers' slot_reset callbacks?
 474                  */
 475                 status = broadcast_error_message(dev,
 476                                 state,
 477                                 "slot_reset",
 478                                 report_slot_reset);
 479         }
 480
 481         if (status == PCI_ERS_RESULT_RECOVERED)
 482                 broadcast_error_message(dev,
 483                                 state,
 484                                 "resume",
 485                                 report_resume);
 486
 487         return status;
 488 }
 489
 490 /**
 491  * handle_error_source - handle logging error into an event log
 492  * @aerdev: pointer to pcie_device data structure of the root port
 493  * @dev: pointer to pci_dev data structure of error source device
 494  * @info: comprehensive error information
 495  *
 496  * Invoked when an error being detected by Root Port.
 497  */
 498 static void handle_error_source(struct pcie_device * aerdev,
 499         struct pci_dev *dev,
 500         struct aer_err_info info)
 501 {
 502         pci_ers_result_t status = 0;
 503         int pos;
 504
 505         if (info.severity == AER_CORRECTABLE) {
 506                 /*
 507                  * Correctable error does not need software intevention.
 508                  * No need to go through error recovery process.
 509                  */
 510                 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 511                 if (pos)
 512                         pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 513                                         info.status);
 514         } else {
 515                 status = do_recovery(aerdev, dev, info.severity);
 516                 if (status == PCI_ERS_RESULT_RECOVERED) {
 517                         dev_printk(KERN_DEBUG, &dev->dev, "AER driver "
 518                                    "successfully recovered\n");
 519                 } else {
 520                         /* TODO: Should kernel panic here? */
 521                         dev_printk(KERN_DEBUG, &dev->dev, "AER driver didn't "
 522                                    "recover\n");
 523                 }
 524         }
 525 }
 526
 527 /**
 528  * aer_enable_rootport - enable Root Port's interrupts when receiving messages
 529  * @rpc: pointer to a Root Port data structure
 530  *
 531  * Invoked when PCIE bus loads AER service driver.
 532  */
 533 void aer_enable_rootport(struct aer_rpc *rpc)
 534 {
 535         struct pci_dev *pdev = rpc->rpd->port;
 536         int pos, aer_pos;
 537         u16 reg16;
 538         u32 reg32;
 539
 540         pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
 541         /* Clear PCIE Capability's Device Status */
 542         pci_read_config_word(pdev, pos+PCI_EXP_DEVSTA, &reg16);
 543         pci_write_config_word(pdev, pos+PCI_EXP_DEVSTA, reg16);
 544
 545         /* Disable system error generation in response to error messages */
 546         pci_read_config_word(pdev, pos + PCI_EXP_RTCTL, &reg16);
 547         reg16 &= ~(SYSTEM_ERROR_INTR_ON_MESG_MASK);
 548         pci_write_config_word(pdev, pos + PCI_EXP_RTCTL, reg16);
 549
 550         aer_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
 551         /* Clear error status */
 552         pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, &reg32);
 553         pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32);
 554         pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, &reg32);
 555         pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32);
 556         pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, &reg32);
 557         pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32);
 558
 559         /*
 560          * Enable error reporting for the root port device and downstream port
 561          * devices.
 562          */
 563         set_downstream_devices_error_reporting(pdev, true);
 564
 565         /* Enable Root Port's interrupt in response to error messages */
 566         pci_write_config_dword(pdev,
 567                 aer_pos + PCI_ERR_ROOT_COMMAND,
 568                 ROOT_PORT_INTR_ON_MESG_MASK);
 569 }
 570
 571 /**
 572  * disable_root_aer - disable Root Port's interrupts when receiving messages
 573  * @rpc: pointer to a Root Port data structure
 574  *
 575  * Invoked when PCIE bus unloads AER service driver.
 576  */
 577 static void disable_root_aer(struct aer_rpc *rpc)
 578 {
 579         struct pci_dev *pdev = rpc->rpd->port;
 580         u32 reg32;
 581         int pos;
 582
 583         /*
 584          * Disable error reporting for the root port device and downstream port
 585          * devices.
 586          */
 587         set_downstream_devices_error_reporting(pdev, false);
 588
 589         pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
 590         /* Disable Root's interrupt in response to error messages */
 591         pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, 0);
 592
 593         /* Clear Root's error status reg */
 594         pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, &reg32);
 595         pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32);
 596 }
 597
 598 /**
 599  * get_e_source - retrieve an error source
 600  * @rpc: pointer to the root port which holds an error
 601  *
 602  * Invoked by DPC handler to consume an error.
 603  */
 604 static struct aer_err_source* get_e_source(struct aer_rpc *rpc)
 605 {
 606         struct aer_err_source *e_source;
 607         unsigned long flags;
 608
 609         /* Lock access to Root error producer/consumer index */
 610         spin_lock_irqsave(&rpc->e_lock, flags);
 611         if (rpc->prod_idx == rpc->cons_idx) {
 612                 spin_unlock_irqrestore(&rpc->e_lock, flags);
 613                 return NULL;
 614         }
 615         e_source = &rpc->e_sources[rpc->cons_idx];
 616         rpc->cons_idx++;
 617         if (rpc->cons_idx == AER_ERROR_SOURCES_MAX)
 618                 rpc->cons_idx = 0;
 619         spin_unlock_irqrestore(&rpc->e_lock, flags);
 620
 621         return e_source;
 622 }
 623
 624 static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
 625 {
 626         int pos;
 627
 628         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 629
 630         /* The device might not support AER */
 631         if (!pos)
 632                 return AER_SUCCESS;
 633
 634         if (info->severity == AER_CORRECTABLE) {
 635                 pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 636                         &info->status);
 637                 if (!(info->status & ERR_CORRECTABLE_ERROR_MASK))
 638                         return AER_UNSUCCESS;
 639         } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE ||
 640                 info->severity == AER_NONFATAL) {
 641
 642                 /* Link is still healthy for IO reads */
 643                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
 644                         &info->status);
 645                 if (!(info->status & ERR_UNCORRECTABLE_ERROR_MASK))
 646                         return AER_UNSUCCESS;
 647
 648                 if (info->status & AER_LOG_TLP_MASKS) {
 649                         info->flags |= AER_TLP_HEADER_VALID_FLAG;
 650                         pci_read_config_dword(dev,
 651                                 pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0);
 652                         pci_read_config_dword(dev,
 653                                 pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1);
 654                         pci_read_config_dword(dev,
 655                                 pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2);
 656                         pci_read_config_dword(dev,
 657                                 pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3);
 658                 }
 659         }
 660
 661         return AER_SUCCESS;
 662 }
 663
 664 /**
 665  * aer_isr_one_error - consume an error detected by root port
 666  * @p_device: pointer to error root port service device
 667  * @e_src: pointer to an error source
 668  */
 669 static void aer_isr_one_error(struct pcie_device *p_device,
 670                 struct aer_err_source *e_src)
 671 {
 672         struct device *s_device;
 673         struct aer_err_info e_info = {0, 0, 0,};
 674         int i;
 675         u16 id;
 676
 677         /*
 678          * There is a possibility that both correctable error and
 679          * uncorrectable error being logged. Report correctable error first.
 680          */
 681         for (i = 1; i & ROOT_ERR_STATUS_MASKS ; i <<= 2) {
 682                 if (i > 4)
 683                         break;
 684                 if (!(e_src->status & i))
 685                         continue;
 686
 687                 /* Init comprehensive error information */
 688                 if (i & PCI_ERR_ROOT_COR_RCV) {
 689                         id = ERR_COR_ID(e_src->id);
 690                         e_info.severity = AER_CORRECTABLE;
 691                 } else {
 692                         id = ERR_UNCOR_ID(e_src->id);
 693                         e_info.severity = ((e_src->status >> 6) & 1);
 694                 }
 695                 if (e_src->status &
 696                         (PCI_ERR_ROOT_MULTI_COR_RCV |
 697                          PCI_ERR_ROOT_MULTI_UNCOR_RCV))
 698                         e_info.flags |= AER_MULTI_ERROR_VALID_FLAG;
 699                 if (!(s_device = find_source_device(p_device->port, id))) {
 700                         printk(KERN_DEBUG "%s->can't find device of ID%04x\n",
 701                                 __func__, id);
 702                         continue;
 703                 }
 704                 if (get_device_error_info(to_pci_dev(s_device), &e_info) ==
 705                                 AER_SUCCESS) {
 706                         aer_print_error(to_pci_dev(s_device), &e_info);
 707                         handle_error_source(p_device,
 708                                 to_pci_dev(s_device),
 709                                 e_info);
 710                 }
 711         }
 712 }
 713
 714 /**
 715  * aer_isr - consume errors detected by root port
 716  * @work: definition of this work item
 717  *
 718  * Invoked, as DPC, when root port records new detected error
 719  */
 720 void aer_isr(struct work_struct *work)
 721 {
 722         struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler);
 723         struct pcie_device *p_device = rpc->rpd;
 724         struct aer_err_source *e_src;
 725
 726         mutex_lock(&rpc->rpc_mutex);
 727         e_src = get_e_source(rpc);
 728         while (e_src) {
 729                 aer_isr_one_error(p_device, e_src);
 730                 e_src = get_e_source(rpc);
 731         }
 732         mutex_unlock(&rpc->rpc_mutex);
 733
 734         wake_up(&rpc->wait_release);
 735 }
 736
 737 /**
 738  * aer_delete_rootport - disable root port aer and delete service data
 739  * @rpc: pointer to a root port device being deleted
 740  *
 741  * Invoked when AER service unloaded on a specific Root Port
 742  */
 743 void aer_delete_rootport(struct aer_rpc *rpc)
 744 {
 745         /* Disable root port AER itself */
 746         disable_root_aer(rpc);
 747
 748         kfree(rpc);
 749 }
 750
 751 /**
 752  * aer_init - provide AER initialization
 753  * @dev: pointer to AER pcie device
 754  *
 755  * Invoked when AER service driver is loaded.
 756  */
 757 int aer_init(struct pcie_device *dev)
 758 {
 759         if (aer_osc_setup(dev) && !forceload)
 760                 return -ENXIO;
 761
 762         return AER_SUCCESS;
 763 }
 764
 765 EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
 766 EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
 767 EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status);
 768