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