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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Implement the AER root port service driver. The driver registers an IRQ
- * handler. When a root port triggers an AER interrupt, the IRQ handler
- * collects root port status and schedules work.
- *
- * Copyright (C) 2006 Intel Corp.
- * Tom Long Nguyen (tom.l.nguyen@intel.com)
- * Zhang Yanmin (yanmin.zhang@intel.com)
- *
- * (C) Copyright 2009 Hewlett-Packard Development Company, L.P.
- * Andrew Patterson <andrew.patterson@hp.com>
- */
- #define pr_fmt(fmt) "AER: " fmt
- #define dev_fmt pr_fmt
- #include <linux/bitops.h>
- #include <linux/cper.h>
- #include <linux/pci.h>
- #include <linux/pci-acpi.h>
- #include <linux/sched.h>
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #include <linux/pm.h>
- #include <linux/init.h>
- #include <linux/interrupt.h>
- #include <linux/delay.h>
- #include <linux/kfifo.h>
- #include <linux/slab.h>
- #include <acpi/apei.h>
- #include <ras/ras_event.h>
- #include "../pci.h"
- #include "portdrv.h"
- #define AER_ERROR_SOURCES_MAX 128
- #define AER_MAX_TYPEOF_COR_ERRS 16 /* as per PCI_ERR_COR_STATUS */
- #define AER_MAX_TYPEOF_UNCOR_ERRS 27 /* as per PCI_ERR_UNCOR_STATUS*/
- struct aer_err_source {
- unsigned int status;
- unsigned int id;
- };
- struct aer_rpc {
- struct pci_dev *rpd; /* Root Port device */
- DECLARE_KFIFO(aer_fifo, struct aer_err_source, AER_ERROR_SOURCES_MAX);
- };
- /* AER stats for the device */
- struct aer_stats {
- /*
- * Fields for all AER capable devices. They indicate the errors
- * "as seen by this device". Note that this may mean that if an
- * end point is causing problems, the AER counters may increment
- * at its link partner (e.g. root port) because the errors will be
- * "seen" by the link partner and not the the problematic end point
- * itself (which may report all counters as 0 as it never saw any
- * problems).
- */
- /* Counters for different type of correctable errors */
- u64 dev_cor_errs[AER_MAX_TYPEOF_COR_ERRS];
- /* Counters for different type of fatal uncorrectable errors */
- u64 dev_fatal_errs[AER_MAX_TYPEOF_UNCOR_ERRS];
- /* Counters for different type of nonfatal uncorrectable errors */
- u64 dev_nonfatal_errs[AER_MAX_TYPEOF_UNCOR_ERRS];
- /* Total number of ERR_COR sent by this device */
- u64 dev_total_cor_errs;
- /* Total number of ERR_FATAL sent by this device */
- u64 dev_total_fatal_errs;
- /* Total number of ERR_NONFATAL sent by this device */
- u64 dev_total_nonfatal_errs;
- /*
- * Fields for Root ports & root complex event collectors only, these
- * indicate the total number of ERR_COR, ERR_FATAL, and ERR_NONFATAL
- * messages received by the root port / event collector, INCLUDING the
- * ones that are generated internally (by the rootport itself)
- */
- u64 rootport_total_cor_errs;
- u64 rootport_total_fatal_errs;
- u64 rootport_total_nonfatal_errs;
- };
- #define AER_LOG_TLP_MASKS (PCI_ERR_UNC_POISON_TLP| \
- PCI_ERR_UNC_ECRC| \
- PCI_ERR_UNC_UNSUP| \
- PCI_ERR_UNC_COMP_ABORT| \
- PCI_ERR_UNC_UNX_COMP| \
- PCI_ERR_UNC_MALF_TLP)
- #define SYSTEM_ERROR_INTR_ON_MESG_MASK (PCI_EXP_RTCTL_SECEE| \
- PCI_EXP_RTCTL_SENFEE| \
- PCI_EXP_RTCTL_SEFEE)
- #define ROOT_PORT_INTR_ON_MESG_MASK (PCI_ERR_ROOT_CMD_COR_EN| \
- PCI_ERR_ROOT_CMD_NONFATAL_EN| \
- PCI_ERR_ROOT_CMD_FATAL_EN)
- #define ERR_COR_ID(d) (d & 0xffff)
- #define ERR_UNCOR_ID(d) (d >> 16)
- static int pcie_aer_disable;
- static pci_ers_result_t aer_root_reset(struct pci_dev *dev);
- void pci_no_aer(void)
- {
- pcie_aer_disable = 1;
- }
- bool pci_aer_available(void)
- {
- return !pcie_aer_disable && pci_msi_enabled();
- }
- #ifdef CONFIG_PCIE_ECRC
- #define ECRC_POLICY_DEFAULT 0 /* ECRC set by BIOS */
- #define ECRC_POLICY_OFF 1 /* ECRC off for performance */
- #define ECRC_POLICY_ON 2 /* ECRC on for data integrity */
- static int ecrc_policy = ECRC_POLICY_DEFAULT;
- static const char * const ecrc_policy_str[] = {
- [ECRC_POLICY_DEFAULT] = "bios",
- [ECRC_POLICY_OFF] = "off",
- [ECRC_POLICY_ON] = "on"
- };
- /**
- * enable_ercr_checking - enable PCIe ECRC checking for a device
- * @dev: the PCI device
- *
- * Returns 0 on success, or negative on failure.
- */
- static int enable_ecrc_checking(struct pci_dev *dev)
- {
- int aer = dev->aer_cap;
- u32 reg32;
- if (!aer)
- return -ENODEV;
- pci_read_config_dword(dev, aer + PCI_ERR_CAP, ®32);
- if (reg32 & PCI_ERR_CAP_ECRC_GENC)
- reg32 |= PCI_ERR_CAP_ECRC_GENE;
- if (reg32 & PCI_ERR_CAP_ECRC_CHKC)
- reg32 |= PCI_ERR_CAP_ECRC_CHKE;
- pci_write_config_dword(dev, aer + PCI_ERR_CAP, reg32);
- return 0;
- }
- /**
- * disable_ercr_checking - disables PCIe ECRC checking for a device
- * @dev: the PCI device
- *
- * Returns 0 on success, or negative on failure.
- */
- static int disable_ecrc_checking(struct pci_dev *dev)
- {
- int aer = dev->aer_cap;
- u32 reg32;
- if (!aer)
- return -ENODEV;
- pci_read_config_dword(dev, aer + PCI_ERR_CAP, ®32);
- reg32 &= ~(PCI_ERR_CAP_ECRC_GENE | PCI_ERR_CAP_ECRC_CHKE);
- pci_write_config_dword(dev, aer + PCI_ERR_CAP, reg32);
- return 0;
- }
- /**
- * pcie_set_ecrc_checking - set/unset PCIe ECRC checking for a device based on global policy
- * @dev: the PCI device
- */
- void pcie_set_ecrc_checking(struct pci_dev *dev)
- {
- switch (ecrc_policy) {
- case ECRC_POLICY_DEFAULT:
- return;
- case ECRC_POLICY_OFF:
- disable_ecrc_checking(dev);
- break;
- case ECRC_POLICY_ON:
- enable_ecrc_checking(dev);
- break;
- default:
- return;
- }
- }
- /**
- * pcie_ecrc_get_policy - parse kernel command-line ecrc option
- * @str: ECRC policy from kernel command line to use
- */
- void pcie_ecrc_get_policy(char *str)
- {
- int i;
- i = match_string(ecrc_policy_str, ARRAY_SIZE(ecrc_policy_str), str);
- if (i < 0)
- return;
- ecrc_policy = i;
- }
- #endif /* CONFIG_PCIE_ECRC */
- #define PCI_EXP_AER_FLAGS (PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE | \
- PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE)
- int pcie_aer_is_native(struct pci_dev *dev)
- {
- struct pci_host_bridge *host = pci_find_host_bridge(dev->bus);
- if (!dev->aer_cap)
- return 0;
- return pcie_ports_native || host->native_aer;
- }
- int pci_enable_pcie_error_reporting(struct pci_dev *dev)
- {
- int rc;
- if (!pcie_aer_is_native(dev))
- return -EIO;
- rc = pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_AER_FLAGS);
- return pcibios_err_to_errno(rc);
- }
- EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
- int pci_disable_pcie_error_reporting(struct pci_dev *dev)
- {
- int rc;
- if (!pcie_aer_is_native(dev))
- return -EIO;
- rc = pcie_capability_clear_word(dev, PCI_EXP_DEVCTL, PCI_EXP_AER_FLAGS);
- return pcibios_err_to_errno(rc);
- }
- EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
- int pci_aer_clear_nonfatal_status(struct pci_dev *dev)
- {
- int aer = dev->aer_cap;
- u32 status, sev;
- if (!pcie_aer_is_native(dev))
- return -EIO;
- /* Clear status bits for ERR_NONFATAL errors only */
- pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, &status);
- pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_SEVER, &sev);
- status &= ~sev;
- if (status)
- pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, status);
- return 0;
- }
- EXPORT_SYMBOL_GPL(pci_aer_clear_nonfatal_status);
- void pci_aer_clear_fatal_status(struct pci_dev *dev)
- {
- int aer = dev->aer_cap;
- u32 status, sev;
- if (!pcie_aer_is_native(dev))
- return;
- /* Clear status bits for ERR_FATAL errors only */
- pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, &status);
- pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_SEVER, &sev);
- status &= sev;
- if (status)
- pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, status);
- }
- /**
- * pci_aer_raw_clear_status - Clear AER error registers.
- * @dev: the PCI device
- *
- * Clearing AER error status registers unconditionally, regardless of
- * whether they're owned by firmware or the OS.
- *
- * Returns 0 on success, or negative on failure.
- */
- int pci_aer_raw_clear_status(struct pci_dev *dev)
- {
- int aer = dev->aer_cap;
- u32 status;
- int port_type;
- if (!aer)
- return -EIO;
- port_type = pci_pcie_type(dev);
- if (port_type == PCI_EXP_TYPE_ROOT_PORT) {
- pci_read_config_dword(dev, aer + PCI_ERR_ROOT_STATUS, &status);
- pci_write_config_dword(dev, aer + PCI_ERR_ROOT_STATUS, status);
- }
- pci_read_config_dword(dev, aer + PCI_ERR_COR_STATUS, &status);
- pci_write_config_dword(dev, aer + PCI_ERR_COR_STATUS, status);
- pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, &status);
- pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, status);
- return 0;
- }
- int pci_aer_clear_status(struct pci_dev *dev)
- {
- if (!pcie_aer_is_native(dev))
- return -EIO;
- return pci_aer_raw_clear_status(dev);
- }
- void pci_save_aer_state(struct pci_dev *dev)
- {
- int aer = dev->aer_cap;
- struct pci_cap_saved_state *save_state;
- u32 *cap;
- if (!aer)
- return;
- save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_ERR);
- if (!save_state)
- return;
- cap = &save_state->cap.data[0];
- pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, cap++);
- pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_SEVER, cap++);
- pci_read_config_dword(dev, aer + PCI_ERR_COR_MASK, cap++);
- pci_read_config_dword(dev, aer + PCI_ERR_CAP, cap++);
- if (pcie_cap_has_rtctl(dev))
- pci_read_config_dword(dev, aer + PCI_ERR_ROOT_COMMAND, cap++);
- }
- void pci_restore_aer_state(struct pci_dev *dev)
- {
- int aer = dev->aer_cap;
- struct pci_cap_saved_state *save_state;
- u32 *cap;
- if (!aer)
- return;
- save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_ERR);
- if (!save_state)
- return;
- cap = &save_state->cap.data[0];
- pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, *cap++);
- pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_SEVER, *cap++);
- pci_write_config_dword(dev, aer + PCI_ERR_COR_MASK, *cap++);
- pci_write_config_dword(dev, aer + PCI_ERR_CAP, *cap++);
- if (pcie_cap_has_rtctl(dev))
- pci_write_config_dword(dev, aer + PCI_ERR_ROOT_COMMAND, *cap++);
- }
- void pci_aer_init(struct pci_dev *dev)
- {
- int n;
- dev->aer_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
- if (!dev->aer_cap)
- return;
- dev->aer_stats = kzalloc(sizeof(struct aer_stats), GFP_KERNEL);
- /*
- * We save/restore PCI_ERR_UNCOR_MASK, PCI_ERR_UNCOR_SEVER,
- * PCI_ERR_COR_MASK, and PCI_ERR_CAP. Root and Root Complex Event
- * Collectors also implement PCI_ERR_ROOT_COMMAND (PCIe r5.0, sec
- * 7.8.4).
- */
- n = pcie_cap_has_rtctl(dev) ? 5 : 4;
- pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_ERR, sizeof(u32) * n);
- pci_aer_clear_status(dev);
- }
- void pci_aer_exit(struct pci_dev *dev)
- {
- kfree(dev->aer_stats);
- dev->aer_stats = NULL;
- }
- #define AER_AGENT_RECEIVER 0
- #define AER_AGENT_REQUESTER 1
- #define AER_AGENT_COMPLETER 2
- #define AER_AGENT_TRANSMITTER 3
- #define AER_AGENT_REQUESTER_MASK(t) ((t == AER_CORRECTABLE) ? \
- 0 : (PCI_ERR_UNC_COMP_TIME|PCI_ERR_UNC_UNSUP))
- #define AER_AGENT_COMPLETER_MASK(t) ((t == AER_CORRECTABLE) ? \
- 0 : PCI_ERR_UNC_COMP_ABORT)
- #define AER_AGENT_TRANSMITTER_MASK(t) ((t == AER_CORRECTABLE) ? \
- (PCI_ERR_COR_REP_ROLL|PCI_ERR_COR_REP_TIMER) : 0)
- #define AER_GET_AGENT(t, e) \
- ((e & AER_AGENT_COMPLETER_MASK(t)) ? AER_AGENT_COMPLETER : \
- (e & AER_AGENT_REQUESTER_MASK(t)) ? AER_AGENT_REQUESTER : \
- (e & AER_AGENT_TRANSMITTER_MASK(t)) ? AER_AGENT_TRANSMITTER : \
- AER_AGENT_RECEIVER)
- #define AER_PHYSICAL_LAYER_ERROR 0
- #define AER_DATA_LINK_LAYER_ERROR 1
- #define AER_TRANSACTION_LAYER_ERROR 2
- #define AER_PHYSICAL_LAYER_ERROR_MASK(t) ((t == AER_CORRECTABLE) ? \
- PCI_ERR_COR_RCVR : 0)
- #define AER_DATA_LINK_LAYER_ERROR_MASK(t) ((t == AER_CORRECTABLE) ? \
- (PCI_ERR_COR_BAD_TLP| \
- PCI_ERR_COR_BAD_DLLP| \
- PCI_ERR_COR_REP_ROLL| \
- PCI_ERR_COR_REP_TIMER) : PCI_ERR_UNC_DLP)
- #define AER_GET_LAYER_ERROR(t, e) \
- ((e & AER_PHYSICAL_LAYER_ERROR_MASK(t)) ? AER_PHYSICAL_LAYER_ERROR : \
- (e & AER_DATA_LINK_LAYER_ERROR_MASK(t)) ? AER_DATA_LINK_LAYER_ERROR : \
- AER_TRANSACTION_LAYER_ERROR)
- /*
- * AER error strings
- */
- static const char *aer_error_severity_string[] = {
- "Uncorrected (Non-Fatal)",
- "Uncorrected (Fatal)",
- "Corrected"
- };
- static const char *aer_error_layer[] = {
- "Physical Layer",
- "Data Link Layer",
- "Transaction Layer"
- };
- static const char *aer_correctable_error_string[] = {
- "RxErr", /* Bit Position 0 */
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- "BadTLP", /* Bit Position 6 */
- "BadDLLP", /* Bit Position 7 */
- "Rollover", /* Bit Position 8 */
- NULL,
- NULL,
- NULL,
- "Timeout", /* Bit Position 12 */
- "NonFatalErr", /* Bit Position 13 */
- "CorrIntErr", /* Bit Position 14 */
- "HeaderOF", /* Bit Position 15 */
- NULL, /* Bit Position 16 */
- NULL, /* Bit Position 17 */
- NULL, /* Bit Position 18 */
- NULL, /* Bit Position 19 */
- NULL, /* Bit Position 20 */
- NULL, /* Bit Position 21 */
- NULL, /* Bit Position 22 */
- NULL, /* Bit Position 23 */
- NULL, /* Bit Position 24 */
- NULL, /* Bit Position 25 */
- NULL, /* Bit Position 26 */
- NULL, /* Bit Position 27 */
- NULL, /* Bit Position 28 */
- NULL, /* Bit Position 29 */
- NULL, /* Bit Position 30 */
- NULL, /* Bit Position 31 */
- };
- static const char *aer_uncorrectable_error_string[] = {
- "Undefined", /* Bit Position 0 */
- NULL,
- NULL,
- NULL,
- "DLP", /* Bit Position 4 */
- "SDES", /* Bit Position 5 */
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- "TLP", /* Bit Position 12 */
- "FCP", /* Bit Position 13 */
- "CmpltTO", /* Bit Position 14 */
- "CmpltAbrt", /* Bit Position 15 */
- "UnxCmplt", /* Bit Position 16 */
- "RxOF", /* Bit Position 17 */
- "MalfTLP", /* Bit Position 18 */
- "ECRC", /* Bit Position 19 */
- "UnsupReq", /* Bit Position 20 */
- "ACSViol", /* Bit Position 21 */
- "UncorrIntErr", /* Bit Position 22 */
- "BlockedTLP", /* Bit Position 23 */
- "AtomicOpBlocked", /* Bit Position 24 */
- "TLPBlockedErr", /* Bit Position 25 */
- "PoisonTLPBlocked", /* Bit Position 26 */
- NULL, /* Bit Position 27 */
- NULL, /* Bit Position 28 */
- NULL, /* Bit Position 29 */
- NULL, /* Bit Position 30 */
- NULL, /* Bit Position 31 */
- };
- static const char *aer_agent_string[] = {
- "Receiver ID",
- "Requester ID",
- "Completer ID",
- "Transmitter ID"
- };
- #define aer_stats_dev_attr(name, stats_array, strings_array, \
- total_string, total_field) \
- static ssize_t \
- name##_show(struct device *dev, struct device_attribute *attr, \
- char *buf) \
- { \
- unsigned int i; \
- char *str = buf; \
- struct pci_dev *pdev = to_pci_dev(dev); \
- u64 *stats = pdev->aer_stats->stats_array; \
- \
- for (i = 0; i < ARRAY_SIZE(strings_array); i++) { \
- if (strings_array[i]) \
- str += sprintf(str, "%s %llu\n", \
- strings_array[i], stats[i]); \
- else if (stats[i]) \
- str += sprintf(str, #stats_array "_bit[%d] %llu\n",\
- i, stats[i]); \
- } \
- str += sprintf(str, "TOTAL_%s %llu\n", total_string, \
- pdev->aer_stats->total_field); \
- return str-buf; \
- } \
- static DEVICE_ATTR_RO(name)
- aer_stats_dev_attr(aer_dev_correctable, dev_cor_errs,
- aer_correctable_error_string, "ERR_COR",
- dev_total_cor_errs);
- aer_stats_dev_attr(aer_dev_fatal, dev_fatal_errs,
- aer_uncorrectable_error_string, "ERR_FATAL",
- dev_total_fatal_errs);
- aer_stats_dev_attr(aer_dev_nonfatal, dev_nonfatal_errs,
- aer_uncorrectable_error_string, "ERR_NONFATAL",
- dev_total_nonfatal_errs);
- #define aer_stats_rootport_attr(name, field) \
- static ssize_t \
- name##_show(struct device *dev, struct device_attribute *attr, \
- char *buf) \
- { \
- struct pci_dev *pdev = to_pci_dev(dev); \
- return sprintf(buf, "%llu\n", pdev->aer_stats->field); \
- } \
- static DEVICE_ATTR_RO(name)
- aer_stats_rootport_attr(aer_rootport_total_err_cor,
- rootport_total_cor_errs);
- aer_stats_rootport_attr(aer_rootport_total_err_fatal,
- rootport_total_fatal_errs);
- aer_stats_rootport_attr(aer_rootport_total_err_nonfatal,
- rootport_total_nonfatal_errs);
- static struct attribute *aer_stats_attrs[] __ro_after_init = {
- &dev_attr_aer_dev_correctable.attr,
- &dev_attr_aer_dev_fatal.attr,
- &dev_attr_aer_dev_nonfatal.attr,
- &dev_attr_aer_rootport_total_err_cor.attr,
- &dev_attr_aer_rootport_total_err_fatal.attr,
- &dev_attr_aer_rootport_total_err_nonfatal.attr,
- NULL
- };
- static umode_t aer_stats_attrs_are_visible(struct kobject *kobj,
- struct attribute *a, int n)
- {
- struct device *dev = kobj_to_dev(kobj);
- struct pci_dev *pdev = to_pci_dev(dev);
- if (!pdev->aer_stats)
- return 0;
- if ((a == &dev_attr_aer_rootport_total_err_cor.attr ||
- a == &dev_attr_aer_rootport_total_err_fatal.attr ||
- a == &dev_attr_aer_rootport_total_err_nonfatal.attr) &&
- pci_pcie_type(pdev) != PCI_EXP_TYPE_ROOT_PORT)
- return 0;
- return a->mode;
- }
- const struct attribute_group aer_stats_attr_group = {
- .attrs = aer_stats_attrs,
- .is_visible = aer_stats_attrs_are_visible,
- };
- static void pci_dev_aer_stats_incr(struct pci_dev *pdev,
- struct aer_err_info *info)
- {
- unsigned long status = info->status & ~info->mask;
- int i, max = -1;
- u64 *counter = NULL;
- struct aer_stats *aer_stats = pdev->aer_stats;
- if (!aer_stats)
- return;
- switch (info->severity) {
- case AER_CORRECTABLE:
- aer_stats->dev_total_cor_errs++;
- counter = &aer_stats->dev_cor_errs[0];
- max = AER_MAX_TYPEOF_COR_ERRS;
- break;
- case AER_NONFATAL:
- aer_stats->dev_total_nonfatal_errs++;
- counter = &aer_stats->dev_nonfatal_errs[0];
- max = AER_MAX_TYPEOF_UNCOR_ERRS;
- break;
- case AER_FATAL:
- aer_stats->dev_total_fatal_errs++;
- counter = &aer_stats->dev_fatal_errs[0];
- max = AER_MAX_TYPEOF_UNCOR_ERRS;
- break;
- }
- for_each_set_bit(i, &status, max)
- counter[i]++;
- }
- static void pci_rootport_aer_stats_incr(struct pci_dev *pdev,
- struct aer_err_source *e_src)
- {
- struct aer_stats *aer_stats = pdev->aer_stats;
- if (!aer_stats)
- return;
- if (e_src->status & PCI_ERR_ROOT_COR_RCV)
- aer_stats->rootport_total_cor_errs++;
- if (e_src->status & PCI_ERR_ROOT_UNCOR_RCV) {
- if (e_src->status & PCI_ERR_ROOT_FATAL_RCV)
- aer_stats->rootport_total_fatal_errs++;
- else
- aer_stats->rootport_total_nonfatal_errs++;
- }
- }
- static void __print_tlp_header(struct pci_dev *dev,
- struct aer_header_log_regs *t)
- {
- pci_err(dev, " TLP Header: %08x %08x %08x %08x\n",
- t->dw0, t->dw1, t->dw2, t->dw3);
- }
- static void __aer_print_error(struct pci_dev *dev,
- struct aer_err_info *info)
- {
- const char **strings;
- unsigned long status = info->status & ~info->mask;
- const char *level, *errmsg;
- int i;
- if (info->severity == AER_CORRECTABLE) {
- strings = aer_correctable_error_string;
- level = KERN_WARNING;
- } else {
- strings = aer_uncorrectable_error_string;
- level = KERN_ERR;
- }
- for_each_set_bit(i, &status, 32) {
- errmsg = strings[i];
- if (!errmsg)
- errmsg = "Unknown Error Bit";
- pci_printk(level, dev, " [%2d] %-22s%s\n", i, errmsg,
- info->first_error == i ? " (First)" : "");
- }
- pci_dev_aer_stats_incr(dev, info);
- }
- void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
- {
- int layer, agent;
- int id = ((dev->bus->number << 8) | dev->devfn);
- const char *level;
- if (!info->status) {
- pci_err(dev, "PCIe Bus Error: severity=%s, type=Inaccessible, (Unregistered Agent ID)\n",
- aer_error_severity_string[info->severity]);
- goto out;
- }
- layer = AER_GET_LAYER_ERROR(info->severity, info->status);
- agent = AER_GET_AGENT(info->severity, info->status);
- level = (info->severity == AER_CORRECTABLE) ? KERN_WARNING : KERN_ERR;
- pci_printk(level, dev, "PCIe Bus Error: severity=%s, type=%s, (%s)\n",
- aer_error_severity_string[info->severity],
- aer_error_layer[layer], aer_agent_string[agent]);
- pci_printk(level, dev, " device [%04x:%04x] error status/mask=%08x/%08x\n",
- dev->vendor, dev->device, info->status, info->mask);
- __aer_print_error(dev, info);
- if (info->tlp_header_valid)
- __print_tlp_header(dev, &info->tlp);
- out:
- if (info->id && info->error_dev_num > 1 && info->id == id)
- pci_err(dev, " Error of this Agent is reported first\n");
- trace_aer_event(dev_name(&dev->dev), (info->status & ~info->mask),
- info->severity, info->tlp_header_valid, &info->tlp);
- }
- static void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info)
- {
- u8 bus = info->id >> 8;
- u8 devfn = info->id & 0xff;
- pci_info(dev, "%s%s error received: %04x:%02x:%02x.%d\n",
- info->multi_error_valid ? "Multiple " : "",
- aer_error_severity_string[info->severity],
- pci_domain_nr(dev->bus), bus, PCI_SLOT(devfn),
- PCI_FUNC(devfn));
- }
- #ifdef CONFIG_ACPI_APEI_PCIEAER
- int cper_severity_to_aer(int cper_severity)
- {
- switch (cper_severity) {
- case CPER_SEV_RECOVERABLE:
- return AER_NONFATAL;
- case CPER_SEV_FATAL:
- return AER_FATAL;
- default:
- return AER_CORRECTABLE;
- }
- }
- EXPORT_SYMBOL_GPL(cper_severity_to_aer);
- void cper_print_aer(struct pci_dev *dev, int aer_severity,
- struct aer_capability_regs *aer)
- {
- int layer, agent, tlp_header_valid = 0;
- u32 status, mask;
- struct aer_err_info info;
- if (aer_severity == AER_CORRECTABLE) {
- status = aer->cor_status;
- mask = aer->cor_mask;
- } else {
- status = aer->uncor_status;
- mask = aer->uncor_mask;
- tlp_header_valid = status & AER_LOG_TLP_MASKS;
- }
- layer = AER_GET_LAYER_ERROR(aer_severity, status);
- agent = AER_GET_AGENT(aer_severity, status);
- memset(&info, 0, sizeof(info));
- info.severity = aer_severity;
- info.status = status;
- info.mask = mask;
- info.first_error = PCI_ERR_CAP_FEP(aer->cap_control);
- pci_err(dev, "aer_status: 0x%08x, aer_mask: 0x%08x\n", status, mask);
- __aer_print_error(dev, &info);
- pci_err(dev, "aer_layer=%s, aer_agent=%s\n",
- aer_error_layer[layer], aer_agent_string[agent]);
- if (aer_severity != AER_CORRECTABLE)
- pci_err(dev, "aer_uncor_severity: 0x%08x\n",
- aer->uncor_severity);
- if (tlp_header_valid)
- __print_tlp_header(dev, &aer->header_log);
- trace_aer_event(dev_name(&dev->dev), (status & ~mask),
- aer_severity, tlp_header_valid, &aer->header_log);
- }
- #endif
- /**
- * add_error_device - list device to be handled
- * @e_info: pointer to error info
- * @dev: pointer to pci_dev to be added
- */
- 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] = pci_dev_get(dev);
- e_info->error_dev_num++;
- return 0;
- }
- return -ENOSPC;
- }
- /**
- * is_error_source - check whether the device is source of reported error
- * @dev: pointer to pci_dev to be checked
- * @e_info: pointer to reported error info
- */
- static bool is_error_source(struct pci_dev *dev, struct aer_err_info *e_info)
- {
- int aer = dev->aer_cap;
- u32 status, mask;
- u16 reg16;
- /*
- * When bus id is equal to 0, it might be a bad id
- * reported by root port.
- */
- if ((PCI_BUS_NUM(e_info->id) != 0) &&
- !(dev->bus->bus_flags & PCI_BUS_FLAGS_NO_AERSID)) {
- /* Device ID match? */
- if (e_info->id == ((dev->bus->number << 8) | dev->devfn))
- return true;
- /* Continue id comparing if there is no multiple error */
- if (!e_info->multi_error_valid)
- return false;
- }
- /*
- * When either
- * 1) bus id is equal to 0. Some ports might lose the bus
- * id of error source id;
- * 2) bus flag PCI_BUS_FLAGS_NO_AERSID is set
- * 3) There are multiple errors and prior ID comparing fails;
- * We check AER status registers to find possible reporter.
- */
- if (atomic_read(&dev->enable_cnt) == 0)
- return false;
- /* Check if AER is enabled */
- pcie_capability_read_word(dev, PCI_EXP_DEVCTL, ®16);
- if (!(reg16 & PCI_EXP_AER_FLAGS))
- return false;
- if (!aer)
- return false;
- /* Check if error is recorded */
- if (e_info->severity == AER_CORRECTABLE) {
- pci_read_config_dword(dev, aer + PCI_ERR_COR_STATUS, &status);
- pci_read_config_dword(dev, aer + PCI_ERR_COR_MASK, &mask);
- } else {
- pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, &status);
- pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, &mask);
- }
- if (status & ~mask)
- return true;
- return false;
- }
- static int find_device_iter(struct pci_dev *dev, void *data)
- {
- struct aer_err_info *e_info = (struct aer_err_info *)data;
- if (is_error_source(dev, e_info)) {
- /* List this device */
- if (add_error_device(e_info, dev)) {
- /* We cannot handle more... Stop iteration */
- /* TODO: Should print error message here? */
- return 1;
- }
- /* If there is only a single error, stop iteration */
- if (!e_info->multi_error_valid)
- return 1;
- }
- return 0;
- }
- /**
- * find_source_device - search through device hierarchy for source device
- * @parent: pointer to Root Port pci_dev data structure
- * @e_info: including detailed error information such like id
- *
- * Return true if found.
- *
- * Invoked by DPC when error is detected at the Root Port.
- * Caller of this function must set id, severity, and multi_error_valid of
- * struct aer_err_info pointed by @e_info properly. This function must fill
- * e_info->error_dev_num and e_info->dev[], based on the given information.
- */
- static bool find_source_device(struct pci_dev *parent,
- struct aer_err_info *e_info)
- {
- struct pci_dev *dev = parent;
- int result;
- /* Must reset in this function */
- e_info->error_dev_num = 0;
- /* Is Root Port an agent that sends error message? */
- result = find_device_iter(dev, e_info);
- if (result)
- return true;
- pci_walk_bus(parent->subordinate, find_device_iter, e_info);
- if (!e_info->error_dev_num) {
- pci_info(parent, "can't find device of ID%04x\n", e_info->id);
- return false;
- }
- return true;
- }
- /**
- * handle_error_source - handle logging error into an event log
- * @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 pci_dev *dev, struct aer_err_info *info)
- {
- int aer = dev->aer_cap;
- if (info->severity == AER_CORRECTABLE) {
- /*
- * Correctable error does not need software intervention.
- * No need to go through error recovery process.
- */
- if (aer)
- pci_write_config_dword(dev, aer + PCI_ERR_COR_STATUS,
- info->status);
- if (pcie_aer_is_native(dev))
- pcie_clear_device_status(dev);
- } else if (info->severity == AER_NONFATAL)
- pcie_do_recovery(dev, pci_channel_io_normal, aer_root_reset);
- else if (info->severity == AER_FATAL)
- pcie_do_recovery(dev, pci_channel_io_frozen, aer_root_reset);
- pci_dev_put(dev);
- }
- #ifdef CONFIG_ACPI_APEI_PCIEAER
- #define AER_RECOVER_RING_ORDER 4
- #define AER_RECOVER_RING_SIZE (1 << AER_RECOVER_RING_ORDER)
- struct aer_recover_entry {
- u8 bus;
- u8 devfn;
- u16 domain;
- int severity;
- struct aer_capability_regs *regs;
- };
- static DEFINE_KFIFO(aer_recover_ring, struct aer_recover_entry,
- AER_RECOVER_RING_SIZE);
- static void aer_recover_work_func(struct work_struct *work)
- {
- struct aer_recover_entry entry;
- struct pci_dev *pdev;
- while (kfifo_get(&aer_recover_ring, &entry)) {
- pdev = pci_get_domain_bus_and_slot(entry.domain, entry.bus,
- entry.devfn);
- if (!pdev) {
- pr_err("AER recover: Can not find pci_dev for %04x:%02x:%02x:%x\n",
- entry.domain, entry.bus,
- PCI_SLOT(entry.devfn), PCI_FUNC(entry.devfn));
- continue;
- }
- cper_print_aer(pdev, entry.severity, entry.regs);
- if (entry.severity == AER_NONFATAL)
- pcie_do_recovery(pdev, pci_channel_io_normal,
- aer_root_reset);
- else if (entry.severity == AER_FATAL)
- pcie_do_recovery(pdev, pci_channel_io_frozen,
- aer_root_reset);
- pci_dev_put(pdev);
- }
- }
- /*
- * Mutual exclusion for writers of aer_recover_ring, reader side don't
- * need lock, because there is only one reader and lock is not needed
- * between reader and writer.
- */
- static DEFINE_SPINLOCK(aer_recover_ring_lock);
- static DECLARE_WORK(aer_recover_work, aer_recover_work_func);
- void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
- int severity, struct aer_capability_regs *aer_regs)
- {
- struct aer_recover_entry entry = {
- .bus = bus,
- .devfn = devfn,
- .domain = domain,
- .severity = severity,
- .regs = aer_regs,
- };
- if (kfifo_in_spinlocked(&aer_recover_ring, &entry, 1,
- &aer_recover_ring_lock))
- schedule_work(&aer_recover_work);
- else
- pr_err("AER recover: Buffer overflow when recovering AER for %04x:%02x:%02x:%x\n",
- domain, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
- }
- EXPORT_SYMBOL_GPL(aer_recover_queue);
- #endif
- /**
- * aer_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.
- *
- * Note that @info is reused among all error devices. Clear fields properly.
- */
- int aer_get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
- {
- int aer = dev->aer_cap;
- int temp;
- /* Must reset in this function */
- info->status = 0;
- info->tlp_header_valid = 0;
- /* The device might not support AER */
- if (!aer)
- return 0;
- if (info->severity == AER_CORRECTABLE) {
- pci_read_config_dword(dev, aer + PCI_ERR_COR_STATUS,
- &info->status);
- pci_read_config_dword(dev, aer + PCI_ERR_COR_MASK,
- &info->mask);
- if (!(info->status & ~info->mask))
- return 0;
- } else if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
- pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM ||
- info->severity == AER_NONFATAL) {
- /* Link is still healthy for IO reads */
- pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS,
- &info->status);
- pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_MASK,
- &info->mask);
- if (!(info->status & ~info->mask))
- return 0;
- /* Get First Error Pointer */
- pci_read_config_dword(dev, aer + 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,
- aer + PCI_ERR_HEADER_LOG, &info->tlp.dw0);
- pci_read_config_dword(dev,
- aer + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1);
- pci_read_config_dword(dev,
- aer + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2);
- pci_read_config_dword(dev,
- aer + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3);
- }
- }
- return 1;
- }
- static inline void aer_process_err_devices(struct aer_err_info *e_info)
- {
- int i;
- /* 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 (aer_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 (aer_get_device_error_info(e_info->dev[i], e_info))
- handle_error_source(e_info->dev[i], e_info);
- }
- }
- /**
- * aer_isr_one_error - consume an error detected by root port
- * @rpc: pointer to the root port which holds an error
- * @e_src: pointer to an error source
- */
- static void aer_isr_one_error(struct aer_rpc *rpc,
- struct aer_err_source *e_src)
- {
- struct pci_dev *pdev = rpc->rpd;
- struct aer_err_info e_info;
- pci_rootport_aer_stats_incr(pdev, e_src);
- /*
- * There is a possibility that both correctable error and
- * uncorrectable error being logged. Report correctable error first.
- */
- if (e_src->status & PCI_ERR_ROOT_COR_RCV) {
- e_info.id = ERR_COR_ID(e_src->id);
- e_info.severity = AER_CORRECTABLE;
- if (e_src->status & PCI_ERR_ROOT_MULTI_COR_RCV)
- e_info.multi_error_valid = 1;
- else
- e_info.multi_error_valid = 0;
- aer_print_port_info(pdev, &e_info);
- if (find_source_device(pdev, &e_info))
- aer_process_err_devices(&e_info);
- }
- if (e_src->status & PCI_ERR_ROOT_UNCOR_RCV) {
- e_info.id = ERR_UNCOR_ID(e_src->id);
- if (e_src->status & PCI_ERR_ROOT_FATAL_RCV)
- e_info.severity = AER_FATAL;
- else
- e_info.severity = AER_NONFATAL;
- if (e_src->status & PCI_ERR_ROOT_MULTI_UNCOR_RCV)
- e_info.multi_error_valid = 1;
- else
- e_info.multi_error_valid = 0;
- aer_print_port_info(pdev, &e_info);
- if (find_source_device(pdev, &e_info))
- aer_process_err_devices(&e_info);
- }
- }
- /**
- * aer_isr - consume errors detected by root port
- * @irq: IRQ assigned to Root Port
- * @context: pointer to Root Port data structure
- *
- * Invoked, as DPC, when root port records new detected error
- */
- static irqreturn_t aer_isr(int irq, void *context)
- {
- struct pcie_device *dev = (struct pcie_device *)context;
- struct aer_rpc *rpc = get_service_data(dev);
- struct aer_err_source e_src;
- if (kfifo_is_empty(&rpc->aer_fifo))
- return IRQ_NONE;
- while (kfifo_get(&rpc->aer_fifo, &e_src))
- aer_isr_one_error(rpc, &e_src);
- return IRQ_HANDLED;
- }
- /**
- * aer_irq - Root Port's ISR
- * @irq: IRQ assigned to Root Port
- * @context: pointer to Root Port data structure
- *
- * Invoked when Root Port detects AER messages.
- */
- static irqreturn_t aer_irq(int irq, void *context)
- {
- struct pcie_device *pdev = (struct pcie_device *)context;
- struct aer_rpc *rpc = get_service_data(pdev);
- struct pci_dev *rp = rpc->rpd;
- int aer = rp->aer_cap;
- struct aer_err_source e_src = {};
- pci_read_config_dword(rp, aer + PCI_ERR_ROOT_STATUS, &e_src.status);
- if (!(e_src.status & (PCI_ERR_ROOT_UNCOR_RCV|PCI_ERR_ROOT_COR_RCV)))
- return IRQ_NONE;
- pci_read_config_dword(rp, aer + PCI_ERR_ROOT_ERR_SRC, &e_src.id);
- pci_write_config_dword(rp, aer + PCI_ERR_ROOT_STATUS, e_src.status);
- if (!kfifo_put(&rpc->aer_fifo, e_src))
- return IRQ_HANDLED;
- return IRQ_WAKE_THREAD;
- }
- static int set_device_error_reporting(struct pci_dev *dev, void *data)
- {
- bool enable = *((bool *)data);
- int type = pci_pcie_type(dev);
- if ((type == PCI_EXP_TYPE_ROOT_PORT) ||
- (type == PCI_EXP_TYPE_UPSTREAM) ||
- (type == PCI_EXP_TYPE_DOWNSTREAM)) {
- 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);
- }
- /**
- * 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.
- */
- static void aer_enable_rootport(struct aer_rpc *rpc)
- {
- struct pci_dev *pdev = rpc->rpd;
- int aer = pdev->aer_cap;
- u16 reg16;
- u32 reg32;
- /* Clear PCIe Capability's Device Status */
- pcie_capability_read_word(pdev, PCI_EXP_DEVSTA, ®16);
- pcie_capability_write_word(pdev, PCI_EXP_DEVSTA, reg16);
- /* Disable system error generation in response to error messages */
- pcie_capability_clear_word(pdev, PCI_EXP_RTCTL,
- SYSTEM_ERROR_INTR_ON_MESG_MASK);
- /* Clear error status */
- pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_STATUS, ®32);
- pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_STATUS, reg32);
- pci_read_config_dword(pdev, aer + PCI_ERR_COR_STATUS, ®32);
- pci_write_config_dword(pdev, aer + PCI_ERR_COR_STATUS, reg32);
- pci_read_config_dword(pdev, aer + PCI_ERR_UNCOR_STATUS, ®32);
- pci_write_config_dword(pdev, aer + 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_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, ®32);
- reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
- pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32);
- }
- /**
- * aer_disable_rootport - 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 aer_disable_rootport(struct aer_rpc *rpc)
- {
- struct pci_dev *pdev = rpc->rpd;
- int aer = pdev->aer_cap;
- u32 reg32;
- /*
- * Disable error reporting for the root port device and downstream port
- * devices.
- */
- set_downstream_devices_error_reporting(pdev, false);
- /* Disable Root's interrupt in response to error messages */
- pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, ®32);
- reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
- pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32);
- /* Clear Root's error status reg */
- pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_STATUS, ®32);
- pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_STATUS, reg32);
- }
- /**
- * aer_remove - clean up resources
- * @dev: pointer to the pcie_dev data structure
- *
- * Invoked when PCI Express bus unloads or AER probe fails.
- */
- static void aer_remove(struct pcie_device *dev)
- {
- struct aer_rpc *rpc = get_service_data(dev);
- aer_disable_rootport(rpc);
- }
- /**
- * aer_probe - initialize resources
- * @dev: pointer to the pcie_dev data structure
- *
- * Invoked when PCI Express bus loads AER service driver.
- */
- static int aer_probe(struct pcie_device *dev)
- {
- int status;
- struct aer_rpc *rpc;
- struct device *device = &dev->device;
- struct pci_dev *port = dev->port;
- rpc = devm_kzalloc(device, sizeof(struct aer_rpc), GFP_KERNEL);
- if (!rpc)
- return -ENOMEM;
- rpc->rpd = port;
- INIT_KFIFO(rpc->aer_fifo);
- set_service_data(dev, rpc);
- status = devm_request_threaded_irq(device, dev->irq, aer_irq, aer_isr,
- IRQF_SHARED, "aerdrv", dev);
- if (status) {
- pci_err(port, "request AER IRQ %d failed\n", dev->irq);
- return status;
- }
- aer_enable_rootport(rpc);
- pci_info(port, "enabled with IRQ %d\n", dev->irq);
- return 0;
- }
- /**
- * aer_root_reset - reset link on Root Port
- * @dev: pointer to Root Port's pci_dev data structure
- *
- * Invoked by Port Bus driver when performing link reset at Root Port.
- */
- static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
- {
- int aer = dev->aer_cap;
- u32 reg32;
- int rc;
- /* Disable Root's interrupt in response to error messages */
- pci_read_config_dword(dev, aer + PCI_ERR_ROOT_COMMAND, ®32);
- reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
- pci_write_config_dword(dev, aer + PCI_ERR_ROOT_COMMAND, reg32);
- rc = pci_bus_error_reset(dev);
- pci_info(dev, "Root Port link has been reset\n");
- /* Clear Root Error Status */
- pci_read_config_dword(dev, aer + PCI_ERR_ROOT_STATUS, ®32);
- pci_write_config_dword(dev, aer + PCI_ERR_ROOT_STATUS, reg32);
- /* Enable Root Port's interrupt in response to error messages */
- pci_read_config_dword(dev, aer + PCI_ERR_ROOT_COMMAND, ®32);
- reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
- pci_write_config_dword(dev, aer + PCI_ERR_ROOT_COMMAND, reg32);
- return rc ? PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_RECOVERED;
- }
- static struct pcie_port_service_driver aerdriver = {
- .name = "aer",
- .port_type = PCI_EXP_TYPE_ROOT_PORT,
- .service = PCIE_PORT_SERVICE_AER,
- .probe = aer_probe,
- .remove = aer_remove,
- };
- /**
- * aer_service_init - register AER root service driver
- *
- * Invoked when AER root service driver is loaded.
- */
- int __init pcie_aer_init(void)
- {
- if (!pci_aer_available())
- return -ENXIO;
- return pcie_port_service_register(&aerdriver);
- }
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