drivers/pci/pcie/aer/aerdrv_core.c

   1 /*
   2  * drivers/pci/pcie/aer/aerdrv_core.c
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * This file implements the core part of PCI-Express AER. When an pci-express
   9  * error is delivered, an error message will be collected and printed to
  10  * console, then, an error recovery procedure will be executed by following
  11  * the pci error recovery rules.
  12  *
  13  * Copyright (C) 2006 Intel Corp.
  14  *      Tom Long Nguyen (tom.l.nguyen@intel.com)
  15  *      Zhang Yanmin (yanmin.zhang@intel.com)
  16  *
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/pci.h>
  21 #include <linux/kernel.h>
  22 #include <linux/errno.h>
  23 #include <linux/pm.h>
  24 #include <linux/suspend.h>
  25 #include <linux/delay.h>
  26 #include <linux/slab.h>
  27 #include "aerdrv.h"
  28
  29 static int forceload;
  30 static int nosourceid;
  31 module_param(forceload, bool, 0);
  32 module_param(nosourceid, bool, 0);
  33
  34 int pci_enable_pcie_error_reporting(struct pci_dev *dev)
  35 {
  36         u16 reg16 = 0;
  37         int pos;
  38
  39         if (dev->aer_firmware_first)
  40                 return -EIO;
  41
  42         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
  43         if (!pos)
  44                 return -EIO;
  45
  46         pos = pci_pcie_cap(dev);
  47         if (!pos)
  48                 return -EIO;
  49
  50         pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, &reg16);
  51         reg16 = reg16 |
  52                 PCI_EXP_DEVCTL_CERE |
  53                 PCI_EXP_DEVCTL_NFERE |
  54                 PCI_EXP_DEVCTL_FERE |
  55                 PCI_EXP_DEVCTL_URRE;
  56         pci_write_config_word(dev, pos+PCI_EXP_DEVCTL, reg16);
  57
  58         return 0;
  59 }
  60 EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
  61
  62 int pci_disable_pcie_error_reporting(struct pci_dev *dev)
  63 {
  64         u16 reg16 = 0;
  65         int pos;
  66
  67         if (dev->aer_firmware_first)
  68                 return -EIO;
  69
  70         pos = pci_pcie_cap(dev);
  71         if (!pos)
  72                 return -EIO;
  73
  74         pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, &reg16);
  75         reg16 = reg16 & ~(PCI_EXP_DEVCTL_CERE |
  76                         PCI_EXP_DEVCTL_NFERE |
  77                         PCI_EXP_DEVCTL_FERE |
  78                         PCI_EXP_DEVCTL_URRE);
  79         pci_write_config_word(dev, pos+PCI_EXP_DEVCTL, reg16);
  80
  81         return 0;
  82 }
  83 EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
  84
  85 int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
  86 {
  87         int pos;
  88         u32 status;
  89
  90         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
  91         if (!pos)
  92                 return -EIO;
  93
  94         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
  95         if (status)
  96                 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
  97
  98         return 0;
  99 }
 100 EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status);
 101
 102 /**
 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 pcie_device *aerdev,
 450                 struct pci_dev *dev)
 451 {
 452         struct pci_dev *udev;
 453         pci_ers_result_t status;
 454         struct pcie_port_service_driver *driver;
 455
 456         if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
 457                 /* Reset this port for all subordinates */
 458                 udev = dev;
 459         } else {
 460                 /* Reset the upstream component (likely downstream port) */
 461                 udev = dev->bus->self;
 462         }
 463
 464         /* Use the aer driver of the component firstly */
 465         driver = find_aer_service(udev);
 466
 467         if (driver && driver->reset_link) {
 468                 status = driver->reset_link(udev);
 469         } else if (udev->pcie_type == PCI_EXP_TYPE_DOWNSTREAM) {
 470                 status = default_downstream_reset_link(udev);
 471         } else {
 472                 dev_printk(KERN_DEBUG, &dev->dev,
 473                         "no link-reset support at upstream device %s\n",
 474                         pci_name(udev));
 475                 return PCI_ERS_RESULT_DISCONNECT;
 476         }
 477
 478         if (status != PCI_ERS_RESULT_RECOVERED) {
 479                 dev_printk(KERN_DEBUG, &dev->dev,
 480                         "link reset at upstream device %s failed\n",
 481                         pci_name(udev));
 482                 return PCI_ERS_RESULT_DISCONNECT;
 483         }
 484
 485         return status;
 486 }
 487
 488 /**
 489  * do_recovery - handle nonfatal/fatal error recovery process
 490  * @aerdev: pointer to a pcie_device data structure of root port
 491  * @dev: pointer to a pci_dev data structure of agent detecting an error
 492  * @severity: error severity type
 493  *
 494  * Invoked when an error is nonfatal/fatal. Once being invoked, broadcast
 495  * error detected message to all downstream drivers within a hierarchy in
 496  * question and return the returned code.
 497  */
 498 static void do_recovery(struct pcie_device *aerdev, struct pci_dev *dev,
 499                 int severity)
 500 {
 501         pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED;
 502         enum pci_channel_state state;
 503
 504         if (severity == AER_FATAL)
 505                 state = pci_channel_io_frozen;
 506         else
 507                 state = pci_channel_io_normal;
 508
 509         status = broadcast_error_message(dev,
 510                         state,
 511                         "error_detected",
 512                         report_error_detected);
 513
 514         if (severity == AER_FATAL) {
 515                 result = reset_link(aerdev, dev);
 516                 if (result != PCI_ERS_RESULT_RECOVERED)
 517                         goto failed;
 518         }
 519
 520         if (status == PCI_ERS_RESULT_CAN_RECOVER)
 521                 status = broadcast_error_message(dev,
 522                                 state,
 523                                 "mmio_enabled",
 524                                 report_mmio_enabled);
 525
 526         if (status == PCI_ERS_RESULT_NEED_RESET) {
 527                 /*
 528                  * TODO: Should call platform-specific
 529                  * functions to reset slot before calling
 530                  * drivers' slot_reset callbacks?
 531                  */
 532                 status = broadcast_error_message(dev,
 533                                 state,
 534                                 "slot_reset",
 535                                 report_slot_reset);
 536         }
 537
 538         if (status != PCI_ERS_RESULT_RECOVERED)
 539                 goto failed;
 540
 541         broadcast_error_message(dev,
 542                                 state,
 543                                 "resume",
 544                                 report_resume);
 545
 546         dev_printk(KERN_DEBUG, &dev->dev,
 547                 "AER driver successfully recovered\n");
 548         return;
 549
 550 failed:
 551         /* TODO: Should kernel panic here? */
 552         dev_printk(KERN_DEBUG, &dev->dev,
 553                 "AER driver didn't recover\n");
 554 }
 555
 556 /**
 557  * handle_error_source - handle logging error into an event log
 558  * @aerdev: pointer to pcie_device data structure of the root port
 559  * @dev: pointer to pci_dev data structure of error source device
 560  * @info: comprehensive error information
 561  *
 562  * Invoked when an error being detected by Root Port.
 563  */
 564 static void handle_error_source(struct pcie_device *aerdev,
 565         struct pci_dev *dev,
 566         struct aer_err_info *info)
 567 {
 568         int pos;
 569
 570         if (info->severity == AER_CORRECTABLE) {
 571                 /*
 572                  * Correctable error does not need software intevention.
 573                  * No need to go through error recovery process.
 574                  */
 575                 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 576                 if (pos)
 577                         pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 578                                         info->status);
 579         } else
 580                 do_recovery(aerdev, dev, info->severity);
 581 }
 582
 583 /**
 584  * get_device_error_info - read error status from dev and store it to info
 585  * @dev: pointer to the device expected to have a error record
 586  * @info: pointer to structure to store the error record
 587  *
 588  * Return 1 on success, 0 on error.
 589  *
 590  * Note that @info is reused among all error devices. Clear fields properly.
 591  */
 592 static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
 593 {
 594         int pos, temp;
 595
 596         /* Must reset in this function */
 597         info->status = 0;
 598         info->tlp_header_valid = 0;
 599
 600         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 601
 602         /* The device might not support AER */
 603         if (!pos)
 604                 return 1;
 605
 606         if (info->severity == AER_CORRECTABLE) {
 607                 pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 608                         &info->status);
 609                 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK,
 610                         &info->mask);
 611                 if (!(info->status & ~info->mask))
 612                         return 0;
 613         } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE ||
 614                 info->severity == AER_NONFATAL) {
 615
 616                 /* Link is still healthy for IO reads */
 617                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
 618                         &info->status);
 619                 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK,
 620                         &info->mask);
 621                 if (!(info->status & ~info->mask))
 622                         return 0;
 623
 624                 /* Get First Error Pointer */
 625                 pci_read_config_dword(dev, pos + PCI_ERR_CAP, &temp);
 626                 info->first_error = PCI_ERR_CAP_FEP(temp);
 627
 628                 if (info->status & AER_LOG_TLP_MASKS) {
 629                         info->tlp_header_valid = 1;
 630                         pci_read_config_dword(dev,
 631                                 pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0);
 632                         pci_read_config_dword(dev,
 633                                 pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1);
 634                         pci_read_config_dword(dev,
 635                                 pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2);
 636                         pci_read_config_dword(dev,
 637                                 pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3);
 638                 }
 639         }
 640
 641         return 1;
 642 }
 643
 644 static inline void aer_process_err_devices(struct pcie_device *p_device,
 645                         struct aer_err_info *e_info)
 646 {
 647         int i;
 648
 649         /* Report all before handle them, not to lost records by reset etc. */
 650         for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
 651                 if (get_device_error_info(e_info->dev[i], e_info))
 652                         aer_print_error(e_info->dev[i], e_info);
 653         }
 654         for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
 655                 if (get_device_error_info(e_info->dev[i], e_info))
 656                         handle_error_source(p_device, e_info->dev[i], e_info);
 657         }
 658 }
 659
 660 /**
 661  * aer_isr_one_error - consume an error detected by root port
 662  * @p_device: pointer to error root port service device
 663  * @e_src: pointer to an error source
 664  */
 665 static void aer_isr_one_error(struct pcie_device *p_device,
 666                 struct aer_err_source *e_src)
 667 {
 668         struct aer_err_info *e_info;
 669
 670         /* struct aer_err_info might be big, so we allocate it with slab */
 671         e_info = kmalloc(sizeof(struct aer_err_info), GFP_KERNEL);
 672         if (!e_info) {
 673                 dev_printk(KERN_DEBUG, &p_device->port->dev,
 674                         "Can't allocate mem when processing AER errors\n");
 675                 return;
 676         }
 677
 678         /*
 679          * There is a possibility that both correctable error and
 680          * uncorrectable error being logged. Report correctable error first.
 681          */
 682         if (e_src->status & PCI_ERR_ROOT_COR_RCV) {
 683                 e_info->id = ERR_COR_ID(e_src->id);
 684                 e_info->severity = AER_CORRECTABLE;
 685
 686                 if (e_src->status & PCI_ERR_ROOT_MULTI_COR_RCV)
 687                         e_info->multi_error_valid = 1;
 688                 else
 689                         e_info->multi_error_valid = 0;
 690
 691                 aer_print_port_info(p_device->port, e_info);
 692
 693                 if (find_source_device(p_device->port, e_info))
 694                         aer_process_err_devices(p_device, e_info);
 695         }
 696
 697         if (e_src->status & PCI_ERR_ROOT_UNCOR_RCV) {
 698                 e_info->id = ERR_UNCOR_ID(e_src->id);
 699
 700                 if (e_src->status & PCI_ERR_ROOT_FATAL_RCV)
 701                         e_info->severity = AER_FATAL;
 702                 else
 703                         e_info->severity = AER_NONFATAL;
 704
 705                 if (e_src->status & PCI_ERR_ROOT_MULTI_UNCOR_RCV)
 706                         e_info->multi_error_valid = 1;
 707                 else
 708                         e_info->multi_error_valid = 0;
 709
 710                 aer_print_port_info(p_device->port, e_info);
 711
 712                 if (find_source_device(p_device->port, e_info))
 713                         aer_process_err_devices(p_device, e_info);
 714         }
 715
 716         kfree(e_info);
 717 }
 718
 719 /**
 720  * get_e_source - retrieve an error source
 721  * @rpc: pointer to the root port which holds an error
 722  * @e_src: pointer to store retrieved error source
 723  *
 724  * Return 1 if an error source is retrieved, otherwise 0.
 725  *
 726  * Invoked by DPC handler to consume an error.
 727  */
 728 static int get_e_source(struct aer_rpc *rpc, struct aer_err_source *e_src)
 729 {
 730         unsigned long flags;
 731         int ret = 0;
 732
 733         /* Lock access to Root error producer/consumer index */
 734         spin_lock_irqsave(&rpc->e_lock, flags);
 735         if (rpc->prod_idx != rpc->cons_idx) {
 736                 *e_src = rpc->e_sources[rpc->cons_idx];
 737                 rpc->cons_idx++;
 738                 if (rpc->cons_idx == AER_ERROR_SOURCES_MAX)
 739                         rpc->cons_idx = 0;
 740                 ret = 1;
 741         }
 742         spin_unlock_irqrestore(&rpc->e_lock, flags);
 743
 744         return ret;
 745 }
 746
 747 /**
 748  * aer_isr - consume errors detected by root port
 749  * @work: definition of this work item
 750  *
 751  * Invoked, as DPC, when root port records new detected error
 752  */
 753 void aer_isr(struct work_struct *work)
 754 {
 755         struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler);
 756         struct pcie_device *p_device = rpc->rpd;
 757         struct aer_err_source e_src;
 758
 759         mutex_lock(&rpc->rpc_mutex);
 760         while (get_e_source(rpc, &e_src))
 761                 aer_isr_one_error(p_device, &e_src);
 762         mutex_unlock(&rpc->rpc_mutex);
 763
 764         wake_up(&rpc->wait_release);
 765 }
 766
 767 /**
 768  * aer_init - provide AER initialization
 769  * @dev: pointer to AER pcie device
 770  *
 771  * Invoked when AER service driver is loaded.
 772  */
 773 int aer_init(struct pcie_device *dev)
 774 {
 775         if (dev->port->aer_firmware_first) {
 776                 dev_printk(KERN_DEBUG, &dev->device,
 777                            "PCIe errors handled by platform firmware.\n");
 778                 goto out;
 779         }
 780
 781         if (aer_osc_setup(dev))
 782                 goto out;
 783
 784         return 0;
 785 out:
 786         if (forceload) {
 787                 dev_printk(KERN_DEBUG, &dev->device,
 788                            "aerdrv forceload requested.\n");
 789                 dev->port->aer_firmware_first = 0;
 790                 return 0;
 791         }
 792         return -ENXIO;
 793 }