// 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 */ #define pr_fmt(fmt) "AER: " fmt #define dev_fmt pr_fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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) #define AER_ERR_STATUS_MASK (PCI_ERR_ROOT_UNCOR_RCV | \ PCI_ERR_ROOT_COR_RCV | \ PCI_ERR_ROOT_MULTI_COR_RCV | \ PCI_ERR_ROOT_MULTI_UNCOR_RCV) 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_ecrc_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_ecrc_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 || port_type == PCI_EXP_TYPE_RC_EC) { 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; \ struct pci_dev *pdev = to_pci_dev(dev); \ u64 *stats = pdev->aer_stats->stats_array; \ size_t len = 0; \ \ for (i = 0; i < ARRAY_SIZE(pdev->aer_stats->stats_array); i++) {\ if (strings_array[i]) \ len += sysfs_emit_at(buf, len, "%s %llu\n", \ strings_array[i], \ stats[i]); \ else if (stats[i]) \ len += sysfs_emit_at(buf, len, \ #stats_array "_bit[%d] %llu\n",\ i, stats[i]); \ } \ len += sysfs_emit_at(buf, len, "TOTAL_%s %llu\n", total_string, \ pdev->aer_stats->total_field); \ return len; \ } \ 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 sysfs_emit(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) && (pci_pcie_type(pdev) != PCI_EXP_TYPE_RC_EC))) 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 message received from %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; if (pci_pcie_type(parent) == PCI_EXP_TYPE_RC_EC) pcie_walk_rcec(parent, find_device_iter, e_info); else pci_walk_bus(parent->subordinate, find_device_iter, e_info); if (!e_info->error_dev_num) { u8 bus = e_info->id >> 8; u8 devfn = e_info->id & 0xff; pci_info(parent, "found no error details for %04x:%02x:%02x.%d\n", pci_domain_nr(parent->bus), bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); 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("no 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("buffer overflow in recovery 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 type = pci_pcie_type(dev); 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 (type == PCI_EXP_TYPE_ROOT_PORT || type == PCI_EXP_TYPE_RC_EC || type == 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 & AER_ERR_STATUS_MASK)) 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_RC_EC) || (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 (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_EC) pcie_walk_rcec(dev, set_device_error_reporting, &enable); else if (dev->subordinate) 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; BUILD_BUG_ON(ARRAY_SIZE(aer_correctable_error_string) < AER_MAX_TYPEOF_COR_ERRS); BUILD_BUG_ON(ARRAY_SIZE(aer_uncorrectable_error_string) < AER_MAX_TYPEOF_UNCOR_ERRS); /* Limit to Root Ports or Root Complex Event Collectors */ if ((pci_pcie_type(port) != PCI_EXP_TYPE_RC_EC) && (pci_pcie_type(port) != PCI_EXP_TYPE_ROOT_PORT)) return -ENODEV; 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 Root Port hierarchy, RCEC, or RCiEP * @dev: pointer to Root Port, RCEC, or RCiEP * * Invoked by Port Bus driver when performing reset. */ static pci_ers_result_t aer_root_reset(struct pci_dev *dev) { int type = pci_pcie_type(dev); struct pci_dev *root; int aer; struct pci_host_bridge *host = pci_find_host_bridge(dev->bus); u32 reg32; int rc; /* * Only Root Ports and RCECs have AER Root Command and Root Status * registers. If "dev" is an RCiEP, the relevant registers are in * the RCEC. */ if (type == PCI_EXP_TYPE_RC_END) root = dev->rcec; else root = pcie_find_root_port(dev); /* * If the platform retained control of AER, an RCiEP may not have * an RCEC visible to us, so dev->rcec ("root") may be NULL. In * that case, firmware is responsible for these registers. */ aer = root ? root->aer_cap : 0; if ((host->native_aer || pcie_ports_native) && aer) { /* Disable Root's interrupt in response to error messages */ pci_read_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, ®32); reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK; pci_write_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, reg32); } if (type == PCI_EXP_TYPE_RC_EC || type == PCI_EXP_TYPE_RC_END) { rc = pcie_reset_flr(dev, PCI_RESET_DO_RESET); if (!rc) pci_info(dev, "has been reset\n"); else pci_info(dev, "not reset (no FLR support: %d)\n", rc); } else { rc = pci_bus_error_reset(dev); pci_info(dev, "%s Port link has been reset (%d)\n", pci_is_root_bus(dev->bus) ? "Root" : "Downstream", rc); } if ((host->native_aer || pcie_ports_native) && aer) { /* Clear Root Error Status */ pci_read_config_dword(root, aer + PCI_ERR_ROOT_STATUS, ®32); pci_write_config_dword(root, aer + PCI_ERR_ROOT_STATUS, reg32); /* Enable Root Port's interrupt in response to error messages */ pci_read_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, ®32); reg32 |= ROOT_PORT_INTR_ON_MESG_MASK; pci_write_config_dword(root, 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 = PCIE_ANY_PORT, .service = PCIE_PORT_SERVICE_AER, .probe = aer_probe, .remove = aer_remove, }; /** * pcie_aer_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); }