| /* |
| * drivers/pci/pcie/aer/aerdrv_core.c |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * This file implements the core part of PCI-Express AER. When an pci-express |
| * error is delivered, an error message will be collected and printed to |
| * console, then, an error recovery procedure will be executed by following |
| * the pci error recovery rules. |
| * |
| * Copyright (C) 2006 Intel Corp. |
| * Tom Long Nguyen (tom.l.nguyen@intel.com) |
| * Zhang Yanmin (yanmin.zhang@intel.com) |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/pm.h> |
| #include <linux/suspend.h> |
| #include <linux/delay.h> |
| #include "aerdrv.h" |
| |
| static int forceload; |
| static int nosourceid; |
| module_param(forceload, bool, 0); |
| module_param(nosourceid, bool, 0); |
| |
| int pci_enable_pcie_error_reporting(struct pci_dev *dev) |
| { |
| u16 reg16 = 0; |
| int pos; |
| |
| if (dev->aer_firmware_first) |
| return -EIO; |
| |
| pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
| if (!pos) |
| return -EIO; |
| |
| pos = pci_pcie_cap(dev); |
| if (!pos) |
| return -EIO; |
| |
| pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16); |
| reg16 = reg16 | |
| PCI_EXP_DEVCTL_CERE | |
| PCI_EXP_DEVCTL_NFERE | |
| PCI_EXP_DEVCTL_FERE | |
| PCI_EXP_DEVCTL_URRE; |
| pci_write_config_word(dev, pos+PCI_EXP_DEVCTL, reg16); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting); |
| |
| int pci_disable_pcie_error_reporting(struct pci_dev *dev) |
| { |
| u16 reg16 = 0; |
| int pos; |
| |
| if (dev->aer_firmware_first) |
| return -EIO; |
| |
| pos = pci_pcie_cap(dev); |
| if (!pos) |
| return -EIO; |
| |
| pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16); |
| reg16 = reg16 & ~(PCI_EXP_DEVCTL_CERE | |
| PCI_EXP_DEVCTL_NFERE | |
| PCI_EXP_DEVCTL_FERE | |
| PCI_EXP_DEVCTL_URRE); |
| pci_write_config_word(dev, pos+PCI_EXP_DEVCTL, reg16); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting); |
| |
| int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev) |
| { |
| int pos; |
| u32 status, mask; |
| |
| pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
| if (!pos) |
| return -EIO; |
| |
| pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); |
| pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask); |
| if (dev->error_state == pci_channel_io_normal) |
| status &= ~mask; /* Clear corresponding nonfatal bits */ |
| else |
| status &= mask; /* Clear corresponding fatal bits */ |
| pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status); |
| |
| #if 0 |
| int pci_cleanup_aer_correct_error_status(struct pci_dev *dev) |
| { |
| int pos; |
| u32 status; |
| |
| pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
| if (!pos) |
| return -EIO; |
| |
| pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status); |
| pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, status); |
| |
| return 0; |
| } |
| #endif /* 0 */ |
| |
| static int set_device_error_reporting(struct pci_dev *dev, void *data) |
| { |
| bool enable = *((bool *)data); |
| |
| if (dev->pcie_type == PCIE_RC_PORT || |
| dev->pcie_type == PCIE_SW_UPSTREAM_PORT || |
| dev->pcie_type == PCIE_SW_DOWNSTREAM_PORT) { |
| if (enable) |
| pci_enable_pcie_error_reporting(dev); |
| else |
| pci_disable_pcie_error_reporting(dev); |
| } |
| |
| if (enable) |
| pcie_set_ecrc_checking(dev); |
| |
| return 0; |
| } |
| |
| /** |
| * set_downstream_devices_error_reporting - enable/disable the error reporting bits on the root port and its downstream ports. |
| * @dev: pointer to root port's pci_dev data structure |
| * @enable: true = enable error reporting, false = disable error reporting. |
| */ |
| static void set_downstream_devices_error_reporting(struct pci_dev *dev, |
| bool enable) |
| { |
| set_device_error_reporting(dev, &enable); |
| |
| if (!dev->subordinate) |
| return; |
| pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable); |
| } |
| |
| static inline int compare_device_id(struct pci_dev *dev, |
| struct aer_err_info *e_info) |
| { |
| if (e_info->id == ((dev->bus->number << 8) | dev->devfn)) { |
| /* |
| * Device ID match |
| */ |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static int add_error_device(struct aer_err_info *e_info, struct pci_dev *dev) |
| { |
| if (e_info->error_dev_num < AER_MAX_MULTI_ERR_DEVICES) { |
| e_info->dev[e_info->error_dev_num] = dev; |
| e_info->error_dev_num++; |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| |
| #define PCI_BUS(x) (((x) >> 8) & 0xff) |
| |
| static int find_device_iter(struct pci_dev *dev, void *data) |
| { |
| int pos; |
| u32 status; |
| u32 mask; |
| u16 reg16; |
| int result; |
| struct aer_err_info *e_info = (struct aer_err_info *)data; |
| |
| /* |
| * When bus id is equal to 0, it might be a bad id |
| * reported by root port. |
| */ |
| if (!nosourceid && (PCI_BUS(e_info->id) != 0)) { |
| result = compare_device_id(dev, e_info); |
| if (result) |
| add_error_device(e_info, dev); |
| |
| /* |
| * If there is no multiple error, we stop |
| * or continue based on the id comparing. |
| */ |
| if (!e_info->multi_error_valid) |
| return result; |
| |
| /* |
| * If there are multiple errors and id does match, |
| * We need continue to search other devices under |
| * the root port. Return 0 means that. |
| */ |
| if (result) |
| return 0; |
| } |
| |
| /* |
| * When either |
| * 1) nosourceid==y; |
| * 2) bus id is equal to 0. Some ports might lose the bus |
| * id of error source id; |
| * 3) There are multiple errors and prior id comparing fails; |
| * We check AER status registers to find the initial reporter. |
| */ |
| if (atomic_read(&dev->enable_cnt) == 0) |
| return 0; |
| pos = pci_pcie_cap(dev); |
| if (!pos) |
| return 0; |
| /* Check if AER is enabled */ |
| pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16); |
| if (!(reg16 & ( |
| PCI_EXP_DEVCTL_CERE | |
| PCI_EXP_DEVCTL_NFERE | |
| PCI_EXP_DEVCTL_FERE | |
| PCI_EXP_DEVCTL_URRE))) |
| return 0; |
| pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
| if (!pos) |
| return 0; |
| |
| status = 0; |
| mask = 0; |
| if (e_info->severity == AER_CORRECTABLE) { |
| pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status); |
| pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &mask); |
| if (status & ~mask) { |
| add_error_device(e_info, dev); |
| goto added; |
| } |
| } else { |
| pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); |
| pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &mask); |
| if (status & ~mask) { |
| add_error_device(e_info, dev); |
| goto added; |
| } |
| } |
| |
| return 0; |
| |
| added: |
| if (e_info->multi_error_valid) |
| return 0; |
| else |
| return 1; |
| } |
| |
| /** |
| * find_source_device - search through device hierarchy for source device |
| * @parent: pointer to Root Port pci_dev data structure |
| * @err_info: including detailed error information such like id |
| * |
| * Invoked when error is detected at the Root Port. |
| */ |
| static void find_source_device(struct pci_dev *parent, |
| struct aer_err_info *e_info) |
| { |
| struct pci_dev *dev = parent; |
| int result; |
| |
| /* Is Root Port an agent that sends error message? */ |
| result = find_device_iter(dev, e_info); |
| if (result) |
| return; |
| |
| pci_walk_bus(parent->subordinate, find_device_iter, e_info); |
| } |
| |
| static int report_error_detected(struct pci_dev *dev, void *data) |
| { |
| pci_ers_result_t vote; |
| struct pci_error_handlers *err_handler; |
| struct aer_broadcast_data *result_data; |
| result_data = (struct aer_broadcast_data *) data; |
| |
| dev->error_state = result_data->state; |
| |
| if (!dev->driver || |
| !dev->driver->err_handler || |
| !dev->driver->err_handler->error_detected) { |
| if (result_data->state == pci_channel_io_frozen && |
| !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) { |
| /* |
| * In case of fatal recovery, if one of down- |
| * stream device has no driver. We might be |
| * unable to recover because a later insmod |
| * of a driver for this device is unaware of |
| * its hw state. |
| */ |
| dev_printk(KERN_DEBUG, &dev->dev, "device has %s\n", |
| dev->driver ? |
| "no AER-aware driver" : "no driver"); |
| } |
| return 0; |
| } |
| |
| err_handler = dev->driver->err_handler; |
| vote = err_handler->error_detected(dev, result_data->state); |
| result_data->result = merge_result(result_data->result, vote); |
| return 0; |
| } |
| |
| static int report_mmio_enabled(struct pci_dev *dev, void *data) |
| { |
| pci_ers_result_t vote; |
| struct pci_error_handlers *err_handler; |
| struct aer_broadcast_data *result_data; |
| result_data = (struct aer_broadcast_data *) data; |
| |
| if (!dev->driver || |
| !dev->driver->err_handler || |
| !dev->driver->err_handler->mmio_enabled) |
| return 0; |
| |
| err_handler = dev->driver->err_handler; |
| vote = err_handler->mmio_enabled(dev); |
| result_data->result = merge_result(result_data->result, vote); |
| return 0; |
| } |
| |
| static int report_slot_reset(struct pci_dev *dev, void *data) |
| { |
| pci_ers_result_t vote; |
| struct pci_error_handlers *err_handler; |
| struct aer_broadcast_data *result_data; |
| result_data = (struct aer_broadcast_data *) data; |
| |
| if (!dev->driver || |
| !dev->driver->err_handler || |
| !dev->driver->err_handler->slot_reset) |
| return 0; |
| |
| err_handler = dev->driver->err_handler; |
| vote = err_handler->slot_reset(dev); |
| result_data->result = merge_result(result_data->result, vote); |
| return 0; |
| } |
| |
| static int report_resume(struct pci_dev *dev, void *data) |
| { |
| struct pci_error_handlers *err_handler; |
| |
| dev->error_state = pci_channel_io_normal; |
| |
| if (!dev->driver || |
| !dev->driver->err_handler || |
| !dev->driver->err_handler->resume) |
| return 0; |
| |
| err_handler = dev->driver->err_handler; |
| err_handler->resume(dev); |
| return 0; |
| } |
| |
| /** |
| * broadcast_error_message - handle message broadcast to downstream drivers |
| * @dev: pointer to from where in a hierarchy message is broadcasted down |
| * @state: error state |
| * @error_mesg: message to print |
| * @cb: callback to be broadcasted |
| * |
| * Invoked during error recovery process. Once being invoked, the content |
| * of error severity will be broadcasted to all downstream drivers in a |
| * hierarchy in question. |
| */ |
| static pci_ers_result_t broadcast_error_message(struct pci_dev *dev, |
| enum pci_channel_state state, |
| char *error_mesg, |
| int (*cb)(struct pci_dev *, void *)) |
| { |
| struct aer_broadcast_data result_data; |
| |
| dev_printk(KERN_DEBUG, &dev->dev, "broadcast %s message\n", error_mesg); |
| result_data.state = state; |
| if (cb == report_error_detected) |
| result_data.result = PCI_ERS_RESULT_CAN_RECOVER; |
| else |
| result_data.result = PCI_ERS_RESULT_RECOVERED; |
| |
| if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) { |
| /* |
| * If the error is reported by a bridge, we think this error |
| * is related to the downstream link of the bridge, so we |
| * do error recovery on all subordinates of the bridge instead |
| * of the bridge and clear the error status of the bridge. |
| */ |
| if (cb == report_error_detected) |
| dev->error_state = state; |
| pci_walk_bus(dev->subordinate, cb, &result_data); |
| if (cb == report_resume) { |
| pci_cleanup_aer_uncorrect_error_status(dev); |
| dev->error_state = pci_channel_io_normal; |
| } |
| } else { |
| /* |
| * If the error is reported by an end point, we think this |
| * error is related to the upstream link of the end point. |
| */ |
| pci_walk_bus(dev->bus, cb, &result_data); |
| } |
| |
| return result_data.result; |
| } |
| |
| struct find_aer_service_data { |
| struct pcie_port_service_driver *aer_driver; |
| int is_downstream; |
| }; |
| |
| static int find_aer_service_iter(struct device *device, void *data) |
| { |
| struct device_driver *driver; |
| struct pcie_port_service_driver *service_driver; |
| struct find_aer_service_data *result; |
| |
| result = (struct find_aer_service_data *) data; |
| |
| if (device->bus == &pcie_port_bus_type) { |
| struct pcie_port_data *port_data; |
| |
| port_data = pci_get_drvdata(to_pcie_device(device)->port); |
| if (port_data->port_type == PCIE_SW_DOWNSTREAM_PORT) |
| result->is_downstream = 1; |
| |
| driver = device->driver; |
| if (driver) { |
| service_driver = to_service_driver(driver); |
| if (service_driver->service == PCIE_PORT_SERVICE_AER) { |
| result->aer_driver = service_driver; |
| return 1; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void find_aer_service(struct pci_dev *dev, |
| struct find_aer_service_data *data) |
| { |
| int retval; |
| retval = device_for_each_child(&dev->dev, data, find_aer_service_iter); |
| } |
| |
| static pci_ers_result_t reset_link(struct pcie_device *aerdev, |
| struct pci_dev *dev) |
| { |
| struct pci_dev *udev; |
| pci_ers_result_t status; |
| struct find_aer_service_data data; |
| |
| if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) |
| udev = dev; |
| else |
| udev = dev->bus->self; |
| |
| data.is_downstream = 0; |
| data.aer_driver = NULL; |
| find_aer_service(udev, &data); |
| |
| /* |
| * Use the aer driver of the error agent firstly. |
| * If it hasn't the aer driver, use the root port's |
| */ |
| if (!data.aer_driver || !data.aer_driver->reset_link) { |
| if (data.is_downstream && |
| aerdev->device.driver && |
| to_service_driver(aerdev->device.driver)->reset_link) { |
| data.aer_driver = |
| to_service_driver(aerdev->device.driver); |
| } else { |
| dev_printk(KERN_DEBUG, &dev->dev, "no link-reset " |
| "support\n"); |
| return PCI_ERS_RESULT_DISCONNECT; |
| } |
| } |
| |
| status = data.aer_driver->reset_link(udev); |
| if (status != PCI_ERS_RESULT_RECOVERED) { |
| dev_printk(KERN_DEBUG, &dev->dev, "link reset at upstream " |
| "device %s failed\n", pci_name(udev)); |
| return PCI_ERS_RESULT_DISCONNECT; |
| } |
| |
| return status; |
| } |
| |
| /** |
| * do_recovery - handle nonfatal/fatal error recovery process |
| * @aerdev: pointer to a pcie_device data structure of root port |
| * @dev: pointer to a pci_dev data structure of agent detecting an error |
| * @severity: error severity type |
| * |
| * Invoked when an error is nonfatal/fatal. Once being invoked, broadcast |
| * error detected message to all downstream drivers within a hierarchy in |
| * question and return the returned code. |
| */ |
| static pci_ers_result_t do_recovery(struct pcie_device *aerdev, |
| struct pci_dev *dev, |
| int severity) |
| { |
| pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED; |
| enum pci_channel_state state; |
| |
| if (severity == AER_FATAL) |
| state = pci_channel_io_frozen; |
| else |
| state = pci_channel_io_normal; |
| |
| status = broadcast_error_message(dev, |
| state, |
| "error_detected", |
| report_error_detected); |
| |
| if (severity == AER_FATAL) { |
| result = reset_link(aerdev, dev); |
| if (result != PCI_ERS_RESULT_RECOVERED) { |
| /* TODO: Should panic here? */ |
| return result; |
| } |
| } |
| |
| if (status == PCI_ERS_RESULT_CAN_RECOVER) |
| status = broadcast_error_message(dev, |
| state, |
| "mmio_enabled", |
| report_mmio_enabled); |
| |
| if (status == PCI_ERS_RESULT_NEED_RESET) { |
| /* |
| * TODO: Should call platform-specific |
| * functions to reset slot before calling |
| * drivers' slot_reset callbacks? |
| */ |
| status = broadcast_error_message(dev, |
| state, |
| "slot_reset", |
| report_slot_reset); |
| } |
| |
| if (status == PCI_ERS_RESULT_RECOVERED) |
| broadcast_error_message(dev, |
| state, |
| "resume", |
| report_resume); |
| |
| return status; |
| } |
| |
| /** |
| * handle_error_source - handle logging error into an event log |
| * @aerdev: pointer to pcie_device data structure of the root port |
| * @dev: pointer to pci_dev data structure of error source device |
| * @info: comprehensive error information |
| * |
| * Invoked when an error being detected by Root Port. |
| */ |
| static void handle_error_source(struct pcie_device *aerdev, |
| struct pci_dev *dev, |
| struct aer_err_info *info) |
| { |
| pci_ers_result_t status = 0; |
| int pos; |
| |
| if (info->severity == AER_CORRECTABLE) { |
| /* |
| * Correctable error does not need software intevention. |
| * No need to go through error recovery process. |
| */ |
| pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
| if (pos) |
| pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, |
| info->status); |
| } else { |
| status = do_recovery(aerdev, dev, info->severity); |
| if (status == PCI_ERS_RESULT_RECOVERED) { |
| dev_printk(KERN_DEBUG, &dev->dev, "AER driver " |
| "successfully recovered\n"); |
| } else { |
| /* TODO: Should kernel panic here? */ |
| dev_printk(KERN_DEBUG, &dev->dev, "AER driver didn't " |
| "recover\n"); |
| } |
| } |
| } |
| |
| /** |
| * aer_enable_rootport - enable Root Port's interrupts when receiving messages |
| * @rpc: pointer to a Root Port data structure |
| * |
| * Invoked when PCIE bus loads AER service driver. |
| */ |
| void aer_enable_rootport(struct aer_rpc *rpc) |
| { |
| struct pci_dev *pdev = rpc->rpd->port; |
| int pos, aer_pos; |
| u16 reg16; |
| u32 reg32; |
| |
| pos = pci_pcie_cap(pdev); |
| /* Clear PCIE Capability's Device Status */ |
| pci_read_config_word(pdev, pos+PCI_EXP_DEVSTA, ®16); |
| pci_write_config_word(pdev, pos+PCI_EXP_DEVSTA, reg16); |
| |
| /* Disable system error generation in response to error messages */ |
| pci_read_config_word(pdev, pos + PCI_EXP_RTCTL, ®16); |
| reg16 &= ~(SYSTEM_ERROR_INTR_ON_MESG_MASK); |
| pci_write_config_word(pdev, pos + PCI_EXP_RTCTL, reg16); |
| |
| aer_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR); |
| /* Clear error status */ |
| pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, ®32); |
| pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32); |
| pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, ®32); |
| pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32); |
| pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, ®32); |
| pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32); |
| |
| /* |
| * Enable error reporting for the root port device and downstream port |
| * devices. |
| */ |
| set_downstream_devices_error_reporting(pdev, true); |
| |
| /* Enable Root Port's interrupt in response to error messages */ |
| pci_write_config_dword(pdev, |
| aer_pos + PCI_ERR_ROOT_COMMAND, |
| ROOT_PORT_INTR_ON_MESG_MASK); |
| } |
| |
| /** |
| * disable_root_aer - disable Root Port's interrupts when receiving messages |
| * @rpc: pointer to a Root Port data structure |
| * |
| * Invoked when PCIE bus unloads AER service driver. |
| */ |
| static void disable_root_aer(struct aer_rpc *rpc) |
| { |
| struct pci_dev *pdev = rpc->rpd->port; |
| u32 reg32; |
| int pos; |
| |
| /* |
| * Disable error reporting for the root port device and downstream port |
| * devices. |
| */ |
| set_downstream_devices_error_reporting(pdev, false); |
| |
| pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR); |
| /* Disable Root's interrupt in response to error messages */ |
| pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, 0); |
| |
| /* Clear Root's error status reg */ |
| pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, ®32); |
| pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32); |
| } |
| |
| /** |
| * get_e_source - retrieve an error source |
| * @rpc: pointer to the root port which holds an error |
| * |
| * Invoked by DPC handler to consume an error. |
| */ |
| static struct aer_err_source *get_e_source(struct aer_rpc *rpc) |
| { |
| struct aer_err_source *e_source; |
| unsigned long flags; |
| |
| /* Lock access to Root error producer/consumer index */ |
| spin_lock_irqsave(&rpc->e_lock, flags); |
| if (rpc->prod_idx == rpc->cons_idx) { |
| spin_unlock_irqrestore(&rpc->e_lock, flags); |
| return NULL; |
| } |
| e_source = &rpc->e_sources[rpc->cons_idx]; |
| rpc->cons_idx++; |
| if (rpc->cons_idx == AER_ERROR_SOURCES_MAX) |
| rpc->cons_idx = 0; |
| spin_unlock_irqrestore(&rpc->e_lock, flags); |
| |
| return e_source; |
| } |
| |
| /** |
| * get_device_error_info - read error status from dev and store it to info |
| * @dev: pointer to the device expected to have a error record |
| * @info: pointer to structure to store the error record |
| * |
| * Return 1 on success, 0 on error. |
| */ |
| static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info) |
| { |
| int pos, temp; |
| |
| info->status = 0; |
| info->tlp_header_valid = 0; |
| |
| pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
| |
| /* The device might not support AER */ |
| if (!pos) |
| return 1; |
| |
| if (info->severity == AER_CORRECTABLE) { |
| pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, |
| &info->status); |
| pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, |
| &info->mask); |
| if (!(info->status & ~info->mask)) |
| return 0; |
| } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE || |
| info->severity == AER_NONFATAL) { |
| |
| /* Link is still healthy for IO reads */ |
| pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, |
| &info->status); |
| pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, |
| &info->mask); |
| if (!(info->status & ~info->mask)) |
| return 0; |
| |
| /* Get First Error Pointer */ |
| pci_read_config_dword(dev, pos + PCI_ERR_CAP, &temp); |
| info->first_error = PCI_ERR_CAP_FEP(temp); |
| |
| if (info->status & AER_LOG_TLP_MASKS) { |
| info->tlp_header_valid = 1; |
| pci_read_config_dword(dev, |
| pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0); |
| pci_read_config_dword(dev, |
| pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1); |
| pci_read_config_dword(dev, |
| pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2); |
| pci_read_config_dword(dev, |
| pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3); |
| } |
| } |
| |
| return 1; |
| } |
| |
| static inline void aer_process_err_devices(struct pcie_device *p_device, |
| struct aer_err_info *e_info) |
| { |
| int i; |
| |
| if (!e_info->dev[0]) { |
| dev_printk(KERN_DEBUG, &p_device->port->dev, |
| "can't find device of ID%04x\n", |
| e_info->id); |
| } |
| |
| /* Report all before handle them, not to lost records by reset etc. */ |
| for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) { |
| if (get_device_error_info(e_info->dev[i], e_info)) |
| aer_print_error(e_info->dev[i], e_info); |
| } |
| for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) { |
| if (get_device_error_info(e_info->dev[i], e_info)) |
| handle_error_source(p_device, e_info->dev[i], e_info); |
| } |
| } |
| |
| /** |
| * aer_isr_one_error - consume an error detected by root port |
| * @p_device: pointer to error root port service device |
| * @e_src: pointer to an error source |
| */ |
| static void aer_isr_one_error(struct pcie_device *p_device, |
| struct aer_err_source *e_src) |
| { |
| struct aer_err_info *e_info; |
| int i; |
| |
| /* struct aer_err_info might be big, so we allocate it with slab */ |
| e_info = kmalloc(sizeof(struct aer_err_info), GFP_KERNEL); |
| if (e_info == NULL) { |
| dev_printk(KERN_DEBUG, &p_device->port->dev, |
| "Can't allocate mem when processing AER errors\n"); |
| return; |
| } |
| |
| /* |
| * There is a possibility that both correctable error and |
| * uncorrectable error being logged. Report correctable error first. |
| */ |
| for (i = 1; i & ROOT_ERR_STATUS_MASKS ; i <<= 2) { |
| if (i > 4) |
| break; |
| if (!(e_src->status & i)) |
| continue; |
| |
| memset(e_info, 0, sizeof(struct aer_err_info)); |
| |
| /* Init comprehensive error information */ |
| if (i & PCI_ERR_ROOT_COR_RCV) { |
| e_info->id = ERR_COR_ID(e_src->id); |
| e_info->severity = AER_CORRECTABLE; |
| } else { |
| e_info->id = ERR_UNCOR_ID(e_src->id); |
| e_info->severity = ((e_src->status >> 6) & 1); |
| } |
| if (e_src->status & |
| (PCI_ERR_ROOT_MULTI_COR_RCV | |
| PCI_ERR_ROOT_MULTI_UNCOR_RCV)) |
| e_info->multi_error_valid = 1; |
| |
| aer_print_port_info(p_device->port, e_info); |
| |
| find_source_device(p_device->port, e_info); |
| aer_process_err_devices(p_device, e_info); |
| } |
| |
| kfree(e_info); |
| } |
| |
| /** |
| * aer_isr - consume errors detected by root port |
| * @work: definition of this work item |
| * |
| * Invoked, as DPC, when root port records new detected error |
| */ |
| void aer_isr(struct work_struct *work) |
| { |
| struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler); |
| struct pcie_device *p_device = rpc->rpd; |
| struct aer_err_source *e_src; |
| |
| mutex_lock(&rpc->rpc_mutex); |
| e_src = get_e_source(rpc); |
| while (e_src) { |
| aer_isr_one_error(p_device, e_src); |
| e_src = get_e_source(rpc); |
| } |
| mutex_unlock(&rpc->rpc_mutex); |
| |
| wake_up(&rpc->wait_release); |
| } |
| |
| /** |
| * aer_delete_rootport - disable root port aer and delete service data |
| * @rpc: pointer to a root port device being deleted |
| * |
| * Invoked when AER service unloaded on a specific Root Port |
| */ |
| void aer_delete_rootport(struct aer_rpc *rpc) |
| { |
| /* Disable root port AER itself */ |
| disable_root_aer(rpc); |
| |
| kfree(rpc); |
| } |
| |
| /** |
| * aer_init - provide AER initialization |
| * @dev: pointer to AER pcie device |
| * |
| * Invoked when AER service driver is loaded. |
| */ |
| int aer_init(struct pcie_device *dev) |
| { |
| if (dev->port->aer_firmware_first) { |
| dev_printk(KERN_DEBUG, &dev->device, |
| "PCIe errors handled by platform firmware.\n"); |
| goto out; |
| } |
| |
| if (aer_osc_setup(dev)) |
| goto out; |
| |
| return 0; |
| out: |
| if (forceload) { |
| dev_printk(KERN_DEBUG, &dev->device, |
| "aerdrv forceload requested.\n"); |
| dev->port->aer_firmware_first = 0; |
| return 0; |
| } |
| return -ENXIO; |
| } |