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/acpi.h>
  26 #include <linux/pci-acpi.h>
  27 #include <linux/delay.h>
  28 #include "aerdrv.h"
  29
  30 static int forceload;
  31 module_param(forceload, bool, 0);
  32
  33 #define PCI_CFG_SPACE_SIZE      (0x100)
  34 int pci_find_aer_capability(struct pci_dev *dev)
  35 {
  36         int pos;
  37         u32 reg32 = 0;
  38
  39         /* Check if it's a pci-express device */
  40         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
  41         if (!pos)
  42                 return 0;
  43
  44         /* Check if it supports pci-express AER */
  45         pos = PCI_CFG_SPACE_SIZE;
  46         while (pos) {
  47                 if (pci_read_config_dword(dev, pos, &reg32))
  48                         return 0;
  49
  50                 /* some broken boards return ~0 */
  51                 if (reg32 == 0xffffffff)
  52                         return 0;
  53
  54                 if (PCI_EXT_CAP_ID(reg32) == PCI_EXT_CAP_ID_ERR)
  55                         break;
  56
  57                 pos = reg32 >> 20;
  58         }
  59
  60         return pos;
  61 }
  62
  63 int pci_enable_pcie_error_reporting(struct pci_dev *dev)
  64 {
  65         u16 reg16 = 0;
  66         int pos;
  67
  68         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
  69         if (!pos)
  70                 return -EIO;
  71
  72         pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, &reg16);
  73         reg16 = reg16 |
  74                 PCI_EXP_DEVCTL_CERE |
  75                 PCI_EXP_DEVCTL_NFERE |
  76                 PCI_EXP_DEVCTL_FERE |
  77                 PCI_EXP_DEVCTL_URRE;
  78         pci_write_config_word(dev, pos+PCI_EXP_DEVCTL,
  79                         reg16);
  80         return 0;
  81 }
  82
  83 int pci_disable_pcie_error_reporting(struct pci_dev *dev)
  84 {
  85         u16 reg16 = 0;
  86         int pos;
  87
  88         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
  89         if (!pos)
  90                 return -EIO;
  91
  92         pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, &reg16);
  93         reg16 = reg16 & ~(PCI_EXP_DEVCTL_CERE |
  94                         PCI_EXP_DEVCTL_NFERE |
  95                         PCI_EXP_DEVCTL_FERE |
  96                         PCI_EXP_DEVCTL_URRE);
  97         pci_write_config_word(dev, pos+PCI_EXP_DEVCTL,
  98                         reg16);
  99         return 0;
 100 }
 101
 102 int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
 103 {
 104         int pos;
 105         u32 status, mask;
 106
 107         pos = pci_find_aer_capability(dev);
 108         if (!pos)
 109                 return -EIO;
 110
 111         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
 112         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
 113         if (dev->error_state == pci_channel_io_normal)
 114                 status &= ~mask; /* Clear corresponding nonfatal bits */
 115         else
 116                 status &= mask; /* Clear corresponding fatal bits */
 117         pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
 118
 119         return 0;
 120 }
 121
 122 static int find_device_iter(struct device *device, void *data)
 123 {
 124         struct pci_dev *dev;
 125         u16 id = *(unsigned long *)data;
 126         u8 secondary, subordinate, d_bus = id >> 8;
 127
 128         if (device->bus == &pci_bus_type) {
 129                 dev = to_pci_dev(device);
 130                 if (id == ((dev->bus->number << 8) | dev->devfn)) {
 131                         /*
 132                          * Device ID match
 133                          */
 134                         *(unsigned long*)data = (unsigned long)device;
 135                         return 1;
 136                 }
 137
 138                 /*
 139                  * If device is P2P, check if it is an upstream?
 140                  */
 141                 if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
 142                         pci_read_config_byte(dev, PCI_SECONDARY_BUS,
 143                                 &secondary);
 144                         pci_read_config_byte(dev, PCI_SUBORDINATE_BUS,
 145                                 &subordinate);
 146                         if (d_bus >= secondary && d_bus <= subordinate) {
 147                                 *(unsigned long*)data = (unsigned long)device;
 148                                 return 1;
 149                         }
 150                 }
 151         }
 152
 153         return 0;
 154 }
 155
 156 /**
 157  * find_source_device - search through device hierarchy for source device
 158  * @p_dev: pointer to Root Port pci_dev data structure
 159  * @id: device ID of agent who sends an error message to this Root Port
 160  *
 161  * Invoked when error is detected at the Root Port.
 162  **/
 163 static struct device* find_source_device(struct pci_dev *parent, u16 id)
 164 {
 165         struct pci_dev *dev = parent;
 166         struct device *device;
 167         unsigned long device_addr;
 168         int status;
 169
 170         /* Is Root Port an agent that sends error message? */
 171         if (id == ((dev->bus->number << 8) | dev->devfn))
 172                 return &dev->dev;
 173
 174         do {
 175                 device_addr = id;
 176                 if ((status = device_for_each_child(&dev->dev,
 177                         &device_addr, find_device_iter))) {
 178                         device = (struct device*)device_addr;
 179                         dev = to_pci_dev(device);
 180                         if (id == ((dev->bus->number << 8) | dev->devfn))
 181                                 return device;
 182                 }
 183         }while (status);
 184
 185         return NULL;
 186 }
 187
 188 static void report_error_detected(struct pci_dev *dev, void *data)
 189 {
 190         pci_ers_result_t vote;
 191         struct pci_error_handlers *err_handler;
 192         struct aer_broadcast_data *result_data;
 193         result_data = (struct aer_broadcast_data *) data;
 194
 195         dev->error_state = result_data->state;
 196
 197         if (!dev->driver ||
 198                 !dev->driver->err_handler ||
 199                 !dev->driver->err_handler->error_detected) {
 200                 if (result_data->state == pci_channel_io_frozen &&
 201                         !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) {
 202                         /*
 203                          * In case of fatal recovery, if one of down-
 204                          * stream device has no driver. We might be
 205                          * unable to recover because a later insmod
 206                          * of a driver for this device is unaware of
 207                          * its hw state.
 208                          */
 209                         printk(KERN_DEBUG "Device ID[%s] has %s\n",
 210                                         dev->dev.bus_id, (dev->driver) ?
 211                                         "no AER-aware driver" : "no driver");
 212                 }
 213                 return;
 214         }
 215
 216         err_handler = dev->driver->err_handler;
 217         vote = err_handler->error_detected(dev, result_data->state);
 218         result_data->result = merge_result(result_data->result, vote);
 219         return;
 220 }
 221
 222 static void report_mmio_enabled(struct pci_dev *dev, void *data)
 223 {
 224         pci_ers_result_t vote;
 225         struct pci_error_handlers *err_handler;
 226         struct aer_broadcast_data *result_data;
 227         result_data = (struct aer_broadcast_data *) data;
 228
 229         if (!dev->driver ||
 230                 !dev->driver->err_handler ||
 231                 !dev->driver->err_handler->mmio_enabled)
 232                 return;
 233
 234         err_handler = dev->driver->err_handler;
 235         vote = err_handler->mmio_enabled(dev);
 236         result_data->result = merge_result(result_data->result, vote);
 237         return;
 238 }
 239
 240 static void report_slot_reset(struct pci_dev *dev, void *data)
 241 {
 242         pci_ers_result_t vote;
 243         struct pci_error_handlers *err_handler;
 244         struct aer_broadcast_data *result_data;
 245         result_data = (struct aer_broadcast_data *) data;
 246
 247         if (!dev->driver ||
 248                 !dev->driver->err_handler ||
 249                 !dev->driver->err_handler->slot_reset)
 250                 return;
 251
 252         err_handler = dev->driver->err_handler;
 253         vote = err_handler->slot_reset(dev);
 254         result_data->result = merge_result(result_data->result, vote);
 255         return;
 256 }
 257
 258 static void report_resume(struct pci_dev *dev, void *data)
 259 {
 260         struct pci_error_handlers *err_handler;
 261
 262         dev->error_state = pci_channel_io_normal;
 263
 264         if (!dev->driver ||
 265                 !dev->driver->err_handler ||
 266                 !dev->driver->err_handler->slot_reset)
 267                 return;
 268
 269         err_handler = dev->driver->err_handler;
 270         err_handler->resume(dev);
 271         return;
 272 }
 273
 274 /**
 275  * broadcast_error_message - handle message broadcast to downstream drivers
 276  * @device: pointer to from where in a hierarchy message is broadcasted down
 277  * @api: callback to be broadcasted
 278  * @state: error state
 279  *
 280  * Invoked during error recovery process. Once being invoked, the content
 281  * of error severity will be broadcasted to all downstream drivers in a
 282  * hierarchy in question.
 283  **/
 284 static pci_ers_result_t broadcast_error_message(struct pci_dev *dev,
 285         enum pci_channel_state state,
 286         char *error_mesg,
 287         void (*cb)(struct pci_dev *, void *))
 288 {
 289         struct aer_broadcast_data result_data;
 290
 291         printk(KERN_DEBUG "Broadcast %s message\n", error_mesg);
 292         result_data.state = state;
 293         if (cb == report_error_detected)
 294                 result_data.result = PCI_ERS_RESULT_CAN_RECOVER;
 295         else
 296                 result_data.result = PCI_ERS_RESULT_RECOVERED;
 297
 298         if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
 299                 /*
 300                  * If the error is reported by a bridge, we think this error
 301                  * is related to the downstream link of the bridge, so we
 302                  * do error recovery on all subordinates of the bridge instead
 303                  * of the bridge and clear the error status of the bridge.
 304                  */
 305                 if (cb == report_error_detected)
 306                         dev->error_state = state;
 307                 pci_walk_bus(dev->subordinate, cb, &result_data);
 308                 if (cb == report_resume) {
 309                         pci_cleanup_aer_uncorrect_error_status(dev);
 310                         dev->error_state = pci_channel_io_normal;
 311                 }
 312         }
 313         else {
 314                 /*
 315                  * If the error is reported by an end point, we think this
 316                  * error is related to the upstream link of the end point.
 317                  */
 318                 pci_walk_bus(dev->bus, cb, &result_data);
 319         }
 320
 321         return result_data.result;
 322 }
 323
 324 struct find_aer_service_data {
 325         struct pcie_port_service_driver *aer_driver;
 326         int is_downstream;
 327 };
 328
 329 static int find_aer_service_iter(struct device *device, void *data)
 330 {
 331         struct device_driver *driver;
 332         struct pcie_port_service_driver *service_driver;
 333         struct pcie_device *pcie_dev;
 334         struct find_aer_service_data *result;
 335
 336         result = (struct find_aer_service_data *) data;
 337
 338         if (device->bus == &pcie_port_bus_type) {
 339                 pcie_dev = to_pcie_device(device);
 340                 if (pcie_dev->id.port_type == PCIE_SW_DOWNSTREAM_PORT)
 341                         result->is_downstream = 1;
 342
 343                 driver = device->driver;
 344                 if (driver) {
 345                         service_driver = to_service_driver(driver);
 346                         if (service_driver->id_table->service_type ==
 347                                         PCIE_PORT_SERVICE_AER) {
 348                                 result->aer_driver = service_driver;
 349                                 return 1;
 350                         }
 351                 }
 352         }
 353
 354         return 0;
 355 }
 356
 357 static void find_aer_service(struct pci_dev *dev,
 358                 struct find_aer_service_data *data)
 359 {
 360         device_for_each_child(&dev->dev, data, find_aer_service_iter);
 361 }
 362
 363 static pci_ers_result_t reset_link(struct pcie_device *aerdev,
 364                 struct pci_dev *dev)
 365 {
 366         struct pci_dev *udev;
 367         pci_ers_result_t status;
 368         struct find_aer_service_data data;
 369
 370         if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)
 371                 udev = dev;
 372         else
 373                 udev= dev->bus->self;
 374
 375         data.is_downstream = 0;
 376         data.aer_driver = NULL;
 377         find_aer_service(udev, &data);
 378
 379         /*
 380          * Use the aer driver of the error agent firstly.
 381          * If it hasn't the aer driver, use the root port's
 382          */
 383         if (!data.aer_driver || !data.aer_driver->reset_link) {
 384                 if (data.is_downstream &&
 385                         aerdev->device.driver &&
 386                         to_service_driver(aerdev->device.driver)->reset_link) {
 387                         data.aer_driver =
 388                                 to_service_driver(aerdev->device.driver);
 389                 } else {
 390                         printk(KERN_DEBUG "No link-reset support to Device ID"
 391                                 "[%s]\n",
 392                                 dev->dev.bus_id);
 393                         return PCI_ERS_RESULT_DISCONNECT;
 394                 }
 395         }
 396
 397         status = data.aer_driver->reset_link(udev);
 398         if (status != PCI_ERS_RESULT_RECOVERED) {
 399                 printk(KERN_DEBUG "Link reset at upstream Device ID"
 400                         "[%s] failed\n",
 401                         udev->dev.bus_id);
 402                 return PCI_ERS_RESULT_DISCONNECT;
 403         }
 404
 405         return status;
 406 }
 407
 408 /**
 409  * do_recovery - handle nonfatal/fatal error recovery process
 410  * @aerdev: pointer to a pcie_device data structure of root port
 411  * @dev: pointer to a pci_dev data structure of agent detecting an error
 412  * @severity: error severity type
 413  *
 414  * Invoked when an error is nonfatal/fatal. Once being invoked, broadcast
 415  * error detected message to all downstream drivers within a hierarchy in
 416  * question and return the returned code.
 417  **/
 418 static pci_ers_result_t do_recovery(struct pcie_device *aerdev,
 419                 struct pci_dev *dev,
 420                 int severity)
 421 {
 422         pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED;
 423         enum pci_channel_state state;
 424
 425         if (severity == AER_FATAL)
 426                 state = pci_channel_io_frozen;
 427         else
 428                 state = pci_channel_io_normal;
 429
 430         status = broadcast_error_message(dev,
 431                         state,
 432                         "error_detected",
 433                         report_error_detected);
 434
 435         if (severity == AER_FATAL) {
 436                 result = reset_link(aerdev, dev);
 437                 if (result != PCI_ERS_RESULT_RECOVERED) {
 438                         /* TODO: Should panic here? */
 439                         return result;
 440                 }
 441         }
 442
 443         if (status == PCI_ERS_RESULT_CAN_RECOVER)
 444                 status = broadcast_error_message(dev,
 445                                 state,
 446                                 "mmio_enabled",
 447                                 report_mmio_enabled);
 448
 449         if (status == PCI_ERS_RESULT_NEED_RESET) {
 450                 /*
 451                  * TODO: Should call platform-specific
 452                  * functions to reset slot before calling
 453                  * drivers' slot_reset callbacks?
 454                  */
 455                 status = broadcast_error_message(dev,
 456                                 state,
 457                                 "slot_reset",
 458                                 report_slot_reset);
 459         }
 460
 461         if (status == PCI_ERS_RESULT_RECOVERED)
 462                 broadcast_error_message(dev,
 463                                 state,
 464                                 "resume",
 465                                 report_resume);
 466
 467         return status;
 468 }
 469
 470 /**
 471  * handle_error_source - handle logging error into an event log
 472  * @aerdev: pointer to pcie_device data structure of the root port
 473  * @dev: pointer to pci_dev data structure of error source device
 474  * @info: comprehensive error information
 475  *
 476  * Invoked when an error being detected by Root Port.
 477  **/
 478 static void handle_error_source(struct pcie_device * aerdev,
 479         struct pci_dev *dev,
 480         struct aer_err_info info)
 481 {
 482         pci_ers_result_t status = 0;
 483         int pos;
 484
 485         if (info.severity == AER_CORRECTABLE) {
 486                 /*
 487                  * Correctable error does not need software intevention.
 488                  * No need to go through error recovery process.
 489                  */
 490                 pos = pci_find_aer_capability(dev);
 491                 if (pos)
 492                         pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 493                                         info.status);
 494         } else {
 495                 status = do_recovery(aerdev, dev, info.severity);
 496                 if (status == PCI_ERS_RESULT_RECOVERED) {
 497                         printk(KERN_DEBUG "AER driver successfully recovered\n");
 498                 } else {
 499                         /* TODO: Should kernel panic here? */
 500                         printk(KERN_DEBUG "AER driver didn't recover\n");
 501                 }
 502         }
 503 }
 504
 505 /**
 506  * aer_enable_rootport - enable Root Port's interrupts when receiving messages
 507  * @rpc: pointer to a Root Port data structure
 508  *
 509  * Invoked when PCIE bus loads AER service driver.
 510  **/
 511 void aer_enable_rootport(struct aer_rpc *rpc)
 512 {
 513         struct pci_dev *pdev = rpc->rpd->port;
 514         int pos, aer_pos;
 515         u16 reg16;
 516         u32 reg32;
 517
 518         pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
 519         /* Clear PCIE Capability's Device Status */
 520         pci_read_config_word(pdev, pos+PCI_EXP_DEVSTA, &reg16);
 521         pci_write_config_word(pdev, pos+PCI_EXP_DEVSTA, reg16);
 522
 523         /* Disable system error generation in response to error messages */
 524         pci_read_config_word(pdev, pos + PCI_EXP_RTCTL, &reg16);
 525         reg16 &= ~(SYSTEM_ERROR_INTR_ON_MESG_MASK);
 526         pci_write_config_word(pdev, pos + PCI_EXP_RTCTL, reg16);
 527
 528         aer_pos = pci_find_aer_capability(pdev);
 529         /* Clear error status */
 530         pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, &reg32);
 531         pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32);
 532         pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, &reg32);
 533         pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32);
 534         pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, &reg32);
 535         pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32);
 536
 537         /* Enable Root Port device reporting error itself */
 538         pci_read_config_word(pdev, pos+PCI_EXP_DEVCTL, &reg16);
 539         reg16 = reg16 |
 540                 PCI_EXP_DEVCTL_CERE |
 541                 PCI_EXP_DEVCTL_NFERE |
 542                 PCI_EXP_DEVCTL_FERE |
 543                 PCI_EXP_DEVCTL_URRE;
 544         pci_write_config_word(pdev, pos+PCI_EXP_DEVCTL,
 545                 reg16);
 546
 547         /* Enable Root Port's interrupt in response to error messages */
 548         pci_write_config_dword(pdev,
 549                 aer_pos + PCI_ERR_ROOT_COMMAND,
 550                 ROOT_PORT_INTR_ON_MESG_MASK);
 551 }
 552
 553 /**
 554  * disable_root_aer - disable Root Port's interrupts when receiving messages
 555  * @rpc: pointer to a Root Port data structure
 556  *
 557  * Invoked when PCIE bus unloads AER service driver.
 558  **/
 559 static void disable_root_aer(struct aer_rpc *rpc)
 560 {
 561         struct pci_dev *pdev = rpc->rpd->port;
 562         u32 reg32;
 563         int pos;
 564
 565         pos = pci_find_aer_capability(pdev);
 566         /* Disable Root's interrupt in response to error messages */
 567         pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, 0);
 568
 569         /* Clear Root's error status reg */
 570         pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, &reg32);
 571         pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32);
 572 }
 573
 574 /**
 575  * get_e_source - retrieve an error source
 576  * @rpc: pointer to the root port which holds an error
 577  *
 578  * Invoked by DPC handler to consume an error.
 579  **/
 580 static struct aer_err_source* get_e_source(struct aer_rpc *rpc)
 581 {
 582         struct aer_err_source *e_source;
 583         unsigned long flags;
 584
 585         /* Lock access to Root error producer/consumer index */
 586         spin_lock_irqsave(&rpc->e_lock, flags);
 587         if (rpc->prod_idx == rpc->cons_idx) {
 588                 spin_unlock_irqrestore(&rpc->e_lock, flags);
 589                 return NULL;
 590         }
 591         e_source = &rpc->e_sources[rpc->cons_idx];
 592         rpc->cons_idx++;
 593         if (rpc->cons_idx == AER_ERROR_SOURCES_MAX)
 594                 rpc->cons_idx = 0;
 595         spin_unlock_irqrestore(&rpc->e_lock, flags);
 596
 597         return e_source;
 598 }
 599
 600 static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
 601 {
 602         int pos;
 603
 604         pos = pci_find_aer_capability(dev);
 605
 606         /* The device might not support AER */
 607         if (!pos)
 608                 return AER_SUCCESS;
 609
 610         if (info->severity == AER_CORRECTABLE) {
 611                 pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 612                         &info->status);
 613                 if (!(info->status & ERR_CORRECTABLE_ERROR_MASK))
 614                         return AER_UNSUCCESS;
 615         } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE ||
 616                 info->severity == AER_NONFATAL) {
 617
 618                 /* Link is still healthy for IO reads */
 619                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
 620                         &info->status);
 621                 if (!(info->status & ERR_UNCORRECTABLE_ERROR_MASK))
 622                         return AER_UNSUCCESS;
 623
 624                 if (info->status & AER_LOG_TLP_MASKS) {
 625                         info->flags |= AER_TLP_HEADER_VALID_FLAG;
 626                         pci_read_config_dword(dev,
 627                                 pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0);
 628                         pci_read_config_dword(dev,
 629                                 pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1);
 630                         pci_read_config_dword(dev,
 631                                 pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2);
 632                         pci_read_config_dword(dev,
 633                                 pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3);
 634                 }
 635         }
 636
 637         return AER_SUCCESS;
 638 }
 639
 640 /**
 641  * aer_isr_one_error - consume an error detected by root port
 642  * @p_device: pointer to error root port service device
 643  * @e_src: pointer to an error source
 644  **/
 645 static void aer_isr_one_error(struct pcie_device *p_device,
 646                 struct aer_err_source *e_src)
 647 {
 648         struct device *s_device;
 649         struct aer_err_info e_info = {0, 0, 0,};
 650         int i;
 651         u16 id;
 652
 653         /*
 654          * There is a possibility that both correctable error and
 655          * uncorrectable error being logged. Report correctable error first.
 656          */
 657         for (i = 1; i & ROOT_ERR_STATUS_MASKS ; i <<= 2) {
 658                 if (i > 4)
 659                         break;
 660                 if (!(e_src->status & i))
 661                         continue;
 662
 663                 /* Init comprehensive error information */
 664                 if (i & PCI_ERR_ROOT_COR_RCV) {
 665                         id = ERR_COR_ID(e_src->id);
 666                         e_info.severity = AER_CORRECTABLE;
 667                 } else {
 668                         id = ERR_UNCOR_ID(e_src->id);
 669                         e_info.severity = ((e_src->status >> 6) & 1);
 670                 }
 671                 if (e_src->status &
 672                         (PCI_ERR_ROOT_MULTI_COR_RCV |
 673                          PCI_ERR_ROOT_MULTI_UNCOR_RCV))
 674                         e_info.flags |= AER_MULTI_ERROR_VALID_FLAG;
 675                 if (!(s_device = find_source_device(p_device->port, id))) {
 676                         printk(KERN_DEBUG "%s->can't find device of ID%04x\n",
 677                                 __FUNCTION__, id);
 678                         continue;
 679                 }
 680                 if (get_device_error_info(to_pci_dev(s_device), &e_info) ==
 681                                 AER_SUCCESS) {
 682                         aer_print_error(to_pci_dev(s_device), &e_info);
 683                         handle_error_source(p_device,
 684                                 to_pci_dev(s_device),
 685                                 e_info);
 686                 }
 687         }
 688 }
 689
 690 /**
 691  * aer_isr - consume errors detected by root port
 692  * @context: pointer to a private data of pcie device
 693  *
 694  * Invoked, as DPC, when root port records new detected error
 695  **/
 696 void aer_isr(void *context)
 697 {
 698         struct pcie_device *p_device = (struct pcie_device *) context;
 699         struct aer_rpc *rpc = get_service_data(p_device);
 700         struct aer_err_source *e_src;
 701
 702         mutex_lock(&rpc->rpc_mutex);
 703         e_src = get_e_source(rpc);
 704         while (e_src) {
 705                 aer_isr_one_error(p_device, e_src);
 706                 e_src = get_e_source(rpc);
 707         }
 708         mutex_unlock(&rpc->rpc_mutex);
 709
 710         wake_up(&rpc->wait_release);
 711 }
 712
 713 /**
 714  * aer_delete_rootport - disable root port aer and delete service data
 715  * @rpc: pointer to a root port device being deleted
 716  *
 717  * Invoked when AER service unloaded on a specific Root Port
 718  **/
 719 void aer_delete_rootport(struct aer_rpc *rpc)
 720 {
 721         /* Disable root port AER itself */
 722         disable_root_aer(rpc);
 723
 724         kfree(rpc);
 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         int status;
 736
 737         /* Run _OSC Method */
 738         status = aer_osc_setup(dev->port);
 739
 740         if(status != OSC_METHOD_RUN_SUCCESS) {
 741                 printk(KERN_DEBUG "%s: AER service init fails - %s\n",
 742                 __FUNCTION__,
 743                 (status == OSC_METHOD_NOT_SUPPORTED) ?
 744                         "No ACPI _OSC support" : "Run ACPI _OSC fails");
 745
 746                 if (!forceload)
 747                         return status;
 748         }
 749
 750         return AER_SUCCESS;
 751 }
 752
 753 EXPORT_SYMBOL_GPL(pci_find_aer_capability);
 754 EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
 755 EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
 756 EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status);
 757