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 <linux/kfifo.h>
  28 #include "aerdrv.h"
  29
  30 static int forceload;
  31 static int nosourceid;
  32 module_param(forceload, bool, 0);
  33 module_param(nosourceid, bool, 0);
  34
  35 int pci_enable_pcie_error_reporting(struct pci_dev *dev)
  36 {
  37         u16 reg16 = 0;
  38         int pos;
  39
  40         if (pcie_aer_get_firmware_first(dev))
  41                 return -EIO;
  42
  43         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
  44         if (!pos)
  45                 return -EIO;
  46
  47         pos = pci_pcie_cap(dev);
  48         if (!pos)
  49                 return -EIO;
  50
  51         pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &reg16);
  52         reg16 |= (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 (pcie_aer_get_firmware_first(dev))
  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 &= ~(PCI_EXP_DEVCTL_CERE |
  76                 PCI_EXP_DEVCTL_NFERE |
  77                 PCI_EXP_DEVCTL_FERE |
  78                 PCI_EXP_DEVCTL_URRE);
  79         pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, reg16);
  80
  81         return 0;
  82 }
  83 EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
  84
  85 int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
  86 {
  87         int pos;
  88         u32 status;
  89
  90         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
  91         if (!pos)
  92                 return -EIO;
  93
  94         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
  95         if (status)
  96                 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
  97
  98         return 0;
  99 }
 100 EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status);
 101
 102 /**
 103  * add_error_device - list device to be handled
 104  * @e_info: pointer to error info
 105  * @dev: pointer to pci_dev to be added
 106  */
 107 static int add_error_device(struct aer_err_info *e_info, struct pci_dev *dev)
 108 {
 109         if (e_info->error_dev_num < AER_MAX_MULTI_ERR_DEVICES) {
 110                 e_info->dev[e_info->error_dev_num] = dev;
 111                 e_info->error_dev_num++;
 112                 return 0;
 113         }
 114         return -ENOSPC;
 115 }
 116
 117 #define PCI_BUS(x)      (((x) >> 8) & 0xff)
 118
 119 /**
 120  * is_error_source - check whether the device is source of reported error
 121  * @dev: pointer to pci_dev to be checked
 122  * @e_info: pointer to reported error info
 123  */
 124 static bool is_error_source(struct pci_dev *dev, struct aer_err_info *e_info)
 125 {
 126         int pos;
 127         u32 status, mask;
 128         u16 reg16;
 129
 130         /*
 131          * When bus id is equal to 0, it might be a bad id
 132          * reported by root port.
 133          */
 134         if (!nosourceid && (PCI_BUS(e_info->id) != 0)) {
 135                 /* Device ID match? */
 136                 if (e_info->id == ((dev->bus->number << 8) | dev->devfn))
 137                         return true;
 138
 139                 /* Continue id comparing if there is no multiple error */
 140                 if (!e_info->multi_error_valid)
 141                         return false;
 142         }
 143
 144         /*
 145          * When either
 146          *      1) nosourceid==y;
 147          *      2) bus id is equal to 0. Some ports might lose the bus
 148          *              id of error source id;
 149          *      3) There are multiple errors and prior id comparing fails;
 150          * We check AER status registers to find possible reporter.
 151          */
 152         if (atomic_read(&dev->enable_cnt) == 0)
 153                 return false;
 154         pos = pci_pcie_cap(dev);
 155         if (!pos)
 156                 return false;
 157
 158         /* Check if AER is enabled */
 159         pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &reg16);
 160         if (!(reg16 & (
 161                 PCI_EXP_DEVCTL_CERE |
 162                 PCI_EXP_DEVCTL_NFERE |
 163                 PCI_EXP_DEVCTL_FERE |
 164                 PCI_EXP_DEVCTL_URRE)))
 165                 return false;
 166         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 167         if (!pos)
 168                 return false;
 169
 170         /* Check if error is recorded */
 171         if (e_info->severity == AER_CORRECTABLE) {
 172                 pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
 173                 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &mask);
 174         } else {
 175                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
 176                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &mask);
 177         }
 178         if (status & ~mask)
 179                 return true;
 180
 181         return false;
 182 }
 183
 184 static int find_device_iter(struct pci_dev *dev, void *data)
 185 {
 186         struct aer_err_info *e_info = (struct aer_err_info *)data;
 187
 188         if (is_error_source(dev, e_info)) {
 189                 /* List this device */
 190                 if (add_error_device(e_info, dev)) {
 191                         /* We cannot handle more... Stop iteration */
 192                         /* TODO: Should print error message here? */
 193                         return 1;
 194                 }
 195
 196                 /* If there is only a single error, stop iteration */
 197                 if (!e_info->multi_error_valid)
 198                         return 1;
 199         }
 200         return 0;
 201 }
 202
 203 /**
 204  * find_source_device - search through device hierarchy for source device
 205  * @parent: pointer to Root Port pci_dev data structure
 206  * @e_info: including detailed error information such like id
 207  *
 208  * Return true if found.
 209  *
 210  * Invoked by DPC when error is detected at the Root Port.
 211  * Caller of this function must set id, severity, and multi_error_valid of
 212  * struct aer_err_info pointed by @e_info properly.  This function must fill
 213  * e_info->error_dev_num and e_info->dev[], based on the given information.
 214  */
 215 static bool find_source_device(struct pci_dev *parent,
 216                 struct aer_err_info *e_info)
 217 {
 218         struct pci_dev *dev = parent;
 219         int result;
 220
 221         /* Must reset in this function */
 222         e_info->error_dev_num = 0;
 223
 224         /* Is Root Port an agent that sends error message? */
 225         result = find_device_iter(dev, e_info);
 226         if (result)
 227                 return true;
 228
 229         pci_walk_bus(parent->subordinate, find_device_iter, e_info);
 230
 231         if (!e_info->error_dev_num) {
 232                 dev_printk(KERN_DEBUG, &parent->dev,
 233                                 "can't find device of ID%04x\n",
 234                                 e_info->id);
 235                 return false;
 236         }
 237         return true;
 238 }
 239
 240 static int report_error_detected(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         dev->error_state = result_data->state;
 248
 249         if (!dev->driver ||
 250                 !dev->driver->err_handler ||
 251                 !dev->driver->err_handler->error_detected) {
 252                 if (result_data->state == pci_channel_io_frozen &&
 253                         !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) {
 254                         /*
 255                          * In case of fatal recovery, if one of down-
 256                          * stream device has no driver. We might be
 257                          * unable to recover because a later insmod
 258                          * of a driver for this device is unaware of
 259                          * its hw state.
 260                          */
 261                         dev_printk(KERN_DEBUG, &dev->dev, "device has %s\n",
 262                                    dev->driver ?
 263                                    "no AER-aware driver" : "no driver");
 264                 }
 265                 return 0;
 266         }
 267
 268         err_handler = dev->driver->err_handler;
 269         vote = err_handler->error_detected(dev, result_data->state);
 270         result_data->result = merge_result(result_data->result, vote);
 271         return 0;
 272 }
 273
 274 static int report_mmio_enabled(struct pci_dev *dev, void *data)
 275 {
 276         pci_ers_result_t vote;
 277         struct pci_error_handlers *err_handler;
 278         struct aer_broadcast_data *result_data;
 279         result_data = (struct aer_broadcast_data *) data;
 280
 281         if (!dev->driver ||
 282                 !dev->driver->err_handler ||
 283                 !dev->driver->err_handler->mmio_enabled)
 284                 return 0;
 285
 286         err_handler = dev->driver->err_handler;
 287         vote = err_handler->mmio_enabled(dev);
 288         result_data->result = merge_result(result_data->result, vote);
 289         return 0;
 290 }
 291
 292 static int report_slot_reset(struct pci_dev *dev, void *data)
 293 {
 294         pci_ers_result_t vote;
 295         struct pci_error_handlers *err_handler;
 296         struct aer_broadcast_data *result_data;
 297         result_data = (struct aer_broadcast_data *) data;
 298
 299         if (!dev->driver ||
 300                 !dev->driver->err_handler ||
 301                 !dev->driver->err_handler->slot_reset)
 302                 return 0;
 303
 304         err_handler = dev->driver->err_handler;
 305         vote = err_handler->slot_reset(dev);
 306         result_data->result = merge_result(result_data->result, vote);
 307         return 0;
 308 }
 309
 310 static int report_resume(struct pci_dev *dev, void *data)
 311 {
 312         struct pci_error_handlers *err_handler;
 313
 314         dev->error_state = pci_channel_io_normal;
 315
 316         if (!dev->driver ||
 317                 !dev->driver->err_handler ||
 318                 !dev->driver->err_handler->resume)
 319                 return 0;
 320
 321         err_handler = dev->driver->err_handler;
 322         err_handler->resume(dev);
 323         return 0;
 324 }
 325
 326 /**
 327  * broadcast_error_message - handle message broadcast to downstream drivers
 328  * @dev: pointer to from where in a hierarchy message is broadcasted down
 329  * @state: error state
 330  * @error_mesg: message to print
 331  * @cb: callback to be broadcasted
 332  *
 333  * Invoked during error recovery process. Once being invoked, the content
 334  * of error severity will be broadcasted to all downstream drivers in a
 335  * hierarchy in question.
 336  */
 337 static pci_ers_result_t broadcast_error_message(struct pci_dev *dev,
 338         enum pci_channel_state state,
 339         char *error_mesg,
 340         int (*cb)(struct pci_dev *, void *))
 341 {
 342         struct aer_broadcast_data result_data;
 343
 344         dev_printk(KERN_DEBUG, &dev->dev, "broadcast %s message\n", error_mesg);
 345         result_data.state = state;
 346         if (cb == report_error_detected)
 347                 result_data.result = PCI_ERS_RESULT_CAN_RECOVER;
 348         else
 349                 result_data.result = PCI_ERS_RESULT_RECOVERED;
 350
 351         if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
 352                 /*
 353                  * If the error is reported by a bridge, we think this error
 354                  * is related to the downstream link of the bridge, so we
 355                  * do error recovery on all subordinates of the bridge instead
 356                  * of the bridge and clear the error status of the bridge.
 357                  */
 358                 if (cb == report_error_detected)
 359                         dev->error_state = state;
 360                 pci_walk_bus(dev->subordinate, cb, &result_data);
 361                 if (cb == report_resume) {
 362                         pci_cleanup_aer_uncorrect_error_status(dev);
 363                         dev->error_state = pci_channel_io_normal;
 364                 }
 365         } else {
 366                 /*
 367                  * If the error is reported by an end point, we think this
 368                  * error is related to the upstream link of the end point.
 369                  */
 370                 pci_walk_bus(dev->bus, cb, &result_data);
 371         }
 372
 373         return result_data.result;
 374 }
 375
 376 /**
 377  * aer_do_secondary_bus_reset - perform secondary bus reset
 378  * @dev: pointer to bridge's pci_dev data structure
 379  *
 380  * Invoked when performing link reset at Root Port or Downstream Port.
 381  */
 382 void aer_do_secondary_bus_reset(struct pci_dev *dev)
 383 {
 384         u16 p2p_ctrl;
 385
 386         /* Assert Secondary Bus Reset */
 387         pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &p2p_ctrl);
 388         p2p_ctrl |= PCI_BRIDGE_CTL_BUS_RESET;
 389         pci_write_config_word(dev, PCI_BRIDGE_CONTROL, p2p_ctrl);
 390
 391         /*
 392          * we should send hot reset message for 2ms to allow it time to
 393          * propagate to all downstream ports
 394          */
 395         msleep(2);
 396
 397         /* De-assert Secondary Bus Reset */
 398         p2p_ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET;
 399         pci_write_config_word(dev, PCI_BRIDGE_CONTROL, p2p_ctrl);
 400
 401         /*
 402          * System software must wait for at least 100ms from the end
 403          * of a reset of one or more device before it is permitted
 404          * to issue Configuration Requests to those devices.
 405          */
 406         msleep(200);
 407 }
 408
 409 /**
 410  * default_downstream_reset_link - default reset function for Downstream Port
 411  * @dev: pointer to downstream port's pci_dev data structure
 412  *
 413  * Invoked when performing link reset at Downstream Port w/ no aer driver.
 414  */
 415 static pci_ers_result_t default_downstream_reset_link(struct pci_dev *dev)
 416 {
 417         aer_do_secondary_bus_reset(dev);
 418         dev_printk(KERN_DEBUG, &dev->dev,
 419                 "Downstream Port link has been reset\n");
 420         return PCI_ERS_RESULT_RECOVERED;
 421 }
 422
 423 static int find_aer_service_iter(struct device *device, void *data)
 424 {
 425         struct pcie_port_service_driver *service_driver, **drv;
 426
 427         drv = (struct pcie_port_service_driver **) data;
 428
 429         if (device->bus == &pcie_port_bus_type && device->driver) {
 430                 service_driver = to_service_driver(device->driver);
 431                 if (service_driver->service == PCIE_PORT_SERVICE_AER) {
 432                         *drv = service_driver;
 433                         return 1;
 434                 }
 435         }
 436
 437         return 0;
 438 }
 439
 440 static struct pcie_port_service_driver *find_aer_service(struct pci_dev *dev)
 441 {
 442         struct pcie_port_service_driver *drv = NULL;
 443
 444         device_for_each_child(&dev->dev, &drv, find_aer_service_iter);
 445
 446         return drv;
 447 }
 448
 449 static pci_ers_result_t reset_link(struct pci_dev *dev)
 450 {
 451         struct pci_dev *udev;
 452         pci_ers_result_t status;
 453         struct pcie_port_service_driver *driver;
 454
 455         if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
 456                 /* Reset this port for all subordinates */
 457                 udev = dev;
 458         } else {
 459                 /* Reset the upstream component (likely downstream port) */
 460                 udev = dev->bus->self;
 461         }
 462
 463         /* Use the aer driver of the component firstly */
 464         driver = find_aer_service(udev);
 465
 466         if (driver && driver->reset_link) {
 467                 status = driver->reset_link(udev);
 468         } else if (udev->pcie_type == PCI_EXP_TYPE_DOWNSTREAM) {
 469                 status = default_downstream_reset_link(udev);
 470         } else {
 471                 dev_printk(KERN_DEBUG, &dev->dev,
 472                         "no link-reset support at upstream device %s\n",
 473                         pci_name(udev));
 474                 return PCI_ERS_RESULT_DISCONNECT;
 475         }
 476
 477         if (status != PCI_ERS_RESULT_RECOVERED) {
 478                 dev_printk(KERN_DEBUG, &dev->dev,
 479                         "link reset at upstream device %s failed\n",
 480                         pci_name(udev));
 481                 return PCI_ERS_RESULT_DISCONNECT;
 482         }
 483
 484         return status;
 485 }
 486
 487 /**
 488  * do_recovery - handle nonfatal/fatal error recovery process
 489  * @dev: pointer to a pci_dev data structure of agent detecting an error
 490  * @severity: error severity type
 491  *
 492  * Invoked when an error is nonfatal/fatal. Once being invoked, broadcast
 493  * error detected message to all downstream drivers within a hierarchy in
 494  * question and return the returned code.
 495  */
 496 static void do_recovery(struct pci_dev *dev, int severity)
 497 {
 498         pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED;
 499         enum pci_channel_state state;
 500
 501         if (severity == AER_FATAL)
 502                 state = pci_channel_io_frozen;
 503         else
 504                 state = pci_channel_io_normal;
 505
 506         status = broadcast_error_message(dev,
 507                         state,
 508                         "error_detected",
 509                         report_error_detected);
 510
 511         if (severity == AER_FATAL) {
 512                 result = reset_link(dev);
 513                 if (result != PCI_ERS_RESULT_RECOVERED)
 514                         goto failed;
 515         }
 516
 517         if (status == PCI_ERS_RESULT_CAN_RECOVER)
 518                 status = broadcast_error_message(dev,
 519                                 state,
 520                                 "mmio_enabled",
 521                                 report_mmio_enabled);
 522
 523         if (status == PCI_ERS_RESULT_NEED_RESET) {
 524                 /*
 525                  * TODO: Should call platform-specific
 526                  * functions to reset slot before calling
 527                  * drivers' slot_reset callbacks?
 528                  */
 529                 status = broadcast_error_message(dev,
 530                                 state,
 531                                 "slot_reset",
 532                                 report_slot_reset);
 533         }
 534
 535         if (status != PCI_ERS_RESULT_RECOVERED)
 536                 goto failed;
 537
 538         broadcast_error_message(dev,
 539                                 state,
 540                                 "resume",
 541                                 report_resume);
 542
 543         dev_printk(KERN_DEBUG, &dev->dev,
 544                 "AER driver successfully recovered\n");
 545         return;
 546
 547 failed:
 548         /* TODO: Should kernel panic here? */
 549         dev_printk(KERN_DEBUG, &dev->dev,
 550                 "AER driver didn't recover\n");
 551 }
 552
 553 /**
 554  * handle_error_source - handle logging error into an event log
 555  * @aerdev: pointer to pcie_device data structure of the root port
 556  * @dev: pointer to pci_dev data structure of error source device
 557  * @info: comprehensive error information
 558  *
 559  * Invoked when an error being detected by Root Port.
 560  */
 561 static void handle_error_source(struct pcie_device *aerdev,
 562         struct pci_dev *dev,
 563         struct aer_err_info *info)
 564 {
 565         int pos;
 566
 567         if (info->severity == AER_CORRECTABLE) {
 568                 /*
 569                  * Correctable error does not need software intevention.
 570                  * No need to go through error recovery process.
 571                  */
 572                 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 573                 if (pos)
 574                         pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 575                                         info->status);
 576         } else
 577                 do_recovery(dev, info->severity);
 578 }
 579
 580 #ifdef CONFIG_ACPI_APEI_PCIEAER
 581 static void aer_recover_work_func(struct work_struct *work);
 582
 583 #define AER_RECOVER_RING_ORDER          4
 584 #define AER_RECOVER_RING_SIZE           (1 << AER_RECOVER_RING_ORDER)
 585
 586 struct aer_recover_entry
 587 {
 588         u8      bus;
 589         u8      devfn;
 590         u16     domain;
 591         int     severity;
 592 };
 593
 594 static DEFINE_KFIFO(aer_recover_ring, struct aer_recover_entry,
 595                     AER_RECOVER_RING_SIZE);
 596 /*
 597  * Mutual exclusion for writers of aer_recover_ring, reader side don't
 598  * need lock, because there is only one reader and lock is not needed
 599  * between reader and writer.
 600  */
 601 static DEFINE_SPINLOCK(aer_recover_ring_lock);
 602 static DECLARE_WORK(aer_recover_work, aer_recover_work_func);
 603
 604 void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
 605                        int severity)
 606 {
 607         unsigned long flags;
 608         struct aer_recover_entry entry = {
 609                 .bus            = bus,
 610                 .devfn          = devfn,
 611                 .domain         = domain,
 612                 .severity       = severity,
 613         };
 614
 615         spin_lock_irqsave(&aer_recover_ring_lock, flags);
 616         if (kfifo_put(&aer_recover_ring, &entry))
 617                 schedule_work(&aer_recover_work);
 618         else
 619                 pr_err("AER recover: Buffer overflow when recovering AER for %04x:%02x:%02x:%x\n",
 620                        domain, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
 621         spin_unlock_irqrestore(&aer_recover_ring_lock, flags);
 622 }
 623 EXPORT_SYMBOL_GPL(aer_recover_queue);
 624
 625 static void aer_recover_work_func(struct work_struct *work)
 626 {
 627         struct aer_recover_entry entry;
 628         struct pci_dev *pdev;
 629
 630         while (kfifo_get(&aer_recover_ring, &entry)) {
 631                 pdev = pci_get_domain_bus_and_slot(entry.domain, entry.bus,
 632                                                    entry.devfn);
 633                 if (!pdev) {
 634                         pr_err("AER recover: Can not find pci_dev for %04x:%02x:%02x:%x\n",
 635                                entry.domain, entry.bus,
 636                                PCI_SLOT(entry.devfn), PCI_FUNC(entry.devfn));
 637                         continue;
 638                 }
 639                 do_recovery(pdev, entry.severity);
 640         }
 641 }
 642 #endif
 643
 644 /**
 645  * get_device_error_info - read error status from dev and store it to info
 646  * @dev: pointer to the device expected to have a error record
 647  * @info: pointer to structure to store the error record
 648  *
 649  * Return 1 on success, 0 on error.
 650  *
 651  * Note that @info is reused among all error devices. Clear fields properly.
 652  */
 653 static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
 654 {
 655         int pos, temp;
 656
 657         /* Must reset in this function */
 658         info->status = 0;
 659         info->tlp_header_valid = 0;
 660
 661         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 662
 663         /* The device might not support AER */
 664         if (!pos)
 665                 return 1;
 666
 667         if (info->severity == AER_CORRECTABLE) {
 668                 pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 669                         &info->status);
 670                 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK,
 671                         &info->mask);
 672                 if (!(info->status & ~info->mask))
 673                         return 0;
 674         } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE ||
 675                 info->severity == AER_NONFATAL) {
 676
 677                 /* Link is still healthy for IO reads */
 678                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
 679                         &info->status);
 680                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK,
 681                         &info->mask);
 682                 if (!(info->status & ~info->mask))
 683                         return 0;
 684
 685                 /* Get First Error Pointer */
 686                 pci_read_config_dword(dev, pos + PCI_ERR_CAP, &temp);
 687                 info->first_error = PCI_ERR_CAP_FEP(temp);
 688
 689                 if (info->status & AER_LOG_TLP_MASKS) {
 690                         info->tlp_header_valid = 1;
 691                         pci_read_config_dword(dev,
 692                                 pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0);
 693                         pci_read_config_dword(dev,
 694                                 pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1);
 695                         pci_read_config_dword(dev,
 696                                 pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2);
 697                         pci_read_config_dword(dev,
 698                                 pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3);
 699                 }
 700         }
 701
 702         return 1;
 703 }
 704
 705 static inline void aer_process_err_devices(struct pcie_device *p_device,
 706                         struct aer_err_info *e_info)
 707 {
 708         int i;
 709
 710         /* Report all before handle them, not to lost records by reset etc. */
 711         for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
 712                 if (get_device_error_info(e_info->dev[i], e_info))
 713                         aer_print_error(e_info->dev[i], e_info);
 714         }
 715         for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
 716                 if (get_device_error_info(e_info->dev[i], e_info))
 717                         handle_error_source(p_device, e_info->dev[i], e_info);
 718         }
 719 }
 720
 721 /**
 722  * aer_isr_one_error - consume an error detected by root port
 723  * @p_device: pointer to error root port service device
 724  * @e_src: pointer to an error source
 725  */
 726 static void aer_isr_one_error(struct pcie_device *p_device,
 727                 struct aer_err_source *e_src)
 728 {
 729         struct aer_err_info *e_info;
 730
 731         /* struct aer_err_info might be big, so we allocate it with slab */
 732         e_info = kmalloc(sizeof(struct aer_err_info), GFP_KERNEL);
 733         if (!e_info) {
 734                 dev_printk(KERN_DEBUG, &p_device->port->dev,
 735                         "Can't allocate mem when processing AER errors\n");
 736                 return;
 737         }
 738
 739         /*
 740          * There is a possibility that both correctable error and
 741          * uncorrectable error being logged. Report correctable error first.
 742          */
 743         if (e_src->status & PCI_ERR_ROOT_COR_RCV) {
 744                 e_info->id = ERR_COR_ID(e_src->id);
 745                 e_info->severity = AER_CORRECTABLE;
 746
 747                 if (e_src->status & PCI_ERR_ROOT_MULTI_COR_RCV)
 748                         e_info->multi_error_valid = 1;
 749                 else
 750                         e_info->multi_error_valid = 0;
 751
 752                 aer_print_port_info(p_device->port, e_info);
 753
 754                 if (find_source_device(p_device->port, e_info))
 755                         aer_process_err_devices(p_device, e_info);
 756         }
 757
 758         if (e_src->status & PCI_ERR_ROOT_UNCOR_RCV) {
 759                 e_info->id = ERR_UNCOR_ID(e_src->id);
 760
 761                 if (e_src->status & PCI_ERR_ROOT_FATAL_RCV)
 762                         e_info->severity = AER_FATAL;
 763                 else
 764                         e_info->severity = AER_NONFATAL;
 765
 766                 if (e_src->status & PCI_ERR_ROOT_MULTI_UNCOR_RCV)
 767                         e_info->multi_error_valid = 1;
 768                 else
 769                         e_info->multi_error_valid = 0;
 770
 771                 aer_print_port_info(p_device->port, e_info);
 772
 773                 if (find_source_device(p_device->port, e_info))
 774                         aer_process_err_devices(p_device, e_info);
 775         }
 776
 777         kfree(e_info);
 778 }
 779
 780 /**
 781  * get_e_source - retrieve an error source
 782  * @rpc: pointer to the root port which holds an error
 783  * @e_src: pointer to store retrieved error source
 784  *
 785  * Return 1 if an error source is retrieved, otherwise 0.
 786  *
 787  * Invoked by DPC handler to consume an error.
 788  */
 789 static int get_e_source(struct aer_rpc *rpc, struct aer_err_source *e_src)
 790 {
 791         unsigned long flags;
 792
 793         /* Lock access to Root error producer/consumer index */
 794         spin_lock_irqsave(&rpc->e_lock, flags);
 795         if (rpc->prod_idx == rpc->cons_idx) {
 796                 spin_unlock_irqrestore(&rpc->e_lock, flags);
 797                 return 0;
 798         }
 799
 800         *e_src = rpc->e_sources[rpc->cons_idx];
 801         rpc->cons_idx++;
 802         if (rpc->cons_idx == AER_ERROR_SOURCES_MAX)
 803                 rpc->cons_idx = 0;
 804         spin_unlock_irqrestore(&rpc->e_lock, flags);
 805
 806         return 1;
 807 }
 808
 809 /**
 810  * aer_isr - consume errors detected by root port
 811  * @work: definition of this work item
 812  *
 813  * Invoked, as DPC, when root port records new detected error
 814  */
 815 void aer_isr(struct work_struct *work)
 816 {
 817         struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler);
 818         struct pcie_device *p_device = rpc->rpd;
 819         struct aer_err_source uninitialized_var(e_src);
 820
 821         mutex_lock(&rpc->rpc_mutex);
 822         while (get_e_source(rpc, &e_src))
 823                 aer_isr_one_error(p_device, &e_src);
 824         mutex_unlock(&rpc->rpc_mutex);
 825
 826         wake_up(&rpc->wait_release);
 827 }
 828
 829 /**
 830  * aer_init - provide AER initialization
 831  * @dev: pointer to AER pcie device
 832  *
 833  * Invoked when AER service driver is loaded.
 834  */
 835 int aer_init(struct pcie_device *dev)
 836 {
 837         if (forceload) {
 838                 dev_printk(KERN_DEBUG, &dev->device,
 839                            "aerdrv forceload requested.\n");
 840                 pcie_aer_force_firmware_first(dev->port, 0);
 841         }
 842         return 0;
 843 }