forked from luck/tmp_suning_uos_patched
PCI/AER: Squash aerdrv_core.c into aerdrv.c
Squash aerdrv_core.c into aerdrv.c. No functional change intended. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Keith Busch <keith.busch@intel.com>
This commit is contained in:
Bjorn Helgaas
Bjorn Helgaas
parent
3c43a64cb3
commit
fd3362cb73
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@ -7,7 +7,7 @@ obj-$(CONFIG_PCIEAER) += aerdriver.o
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obj-$(CONFIG_PCIE_ECRC) += ecrc.o
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aerdriver-objs := aerdrv_errprint.o aerdrv_core.o aerdrv.o
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aerdriver-objs := aerdrv_errprint.o aerdrv.o
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aerdriver-$(CONFIG_ACPI) += aerdrv_acpi.o
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obj-$(CONFIG_PCIEAER_INJECT) += aer_inject.o
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@ -18,6 +18,7 @@
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/kfifo.h>
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#include <linux/slab.h>
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#include "aerdrv.h"
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@ -35,6 +36,479 @@ bool pci_aer_available(void)
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return !pcie_aer_disable && pci_msi_enabled();
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}
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#define PCI_EXP_AER_FLAGS (PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE | \
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PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE)
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int pci_enable_pcie_error_reporting(struct pci_dev *dev)
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{
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if (pcie_aer_get_firmware_first(dev))
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return -EIO;
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if (!dev->aer_cap)
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return -EIO;
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return pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_AER_FLAGS);
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}
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EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
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int pci_disable_pcie_error_reporting(struct pci_dev *dev)
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{
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if (pcie_aer_get_firmware_first(dev))
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return -EIO;
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return pcie_capability_clear_word(dev, PCI_EXP_DEVCTL,
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PCI_EXP_AER_FLAGS);
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}
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EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
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int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
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{
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int pos;
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u32 status;
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pos = dev->aer_cap;
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if (!pos)
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return -EIO;
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pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
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if (status)
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pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status);
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int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
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{
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int pos;
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u32 status;
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int port_type;
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if (!pci_is_pcie(dev))
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return -ENODEV;
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pos = dev->aer_cap;
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if (!pos)
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return -EIO;
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port_type = pci_pcie_type(dev);
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if (port_type == PCI_EXP_TYPE_ROOT_PORT) {
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pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &status);
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pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, status);
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}
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pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
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pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, status);
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pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
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pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
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return 0;
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}
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int pci_aer_init(struct pci_dev *dev)
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{
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dev->aer_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
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return pci_cleanup_aer_error_status_regs(dev);
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}
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/**
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* add_error_device - list device to be handled
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* @e_info: pointer to error info
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* @dev: pointer to pci_dev to be added
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*/
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static int add_error_device(struct aer_err_info *e_info, struct pci_dev *dev)
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{
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if (e_info->error_dev_num < AER_MAX_MULTI_ERR_DEVICES) {
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e_info->dev[e_info->error_dev_num] = dev;
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e_info->error_dev_num++;
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return 0;
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}
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return -ENOSPC;
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}
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/**
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* is_error_source - check whether the device is source of reported error
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* @dev: pointer to pci_dev to be checked
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* @e_info: pointer to reported error info
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*/
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static bool is_error_source(struct pci_dev *dev, struct aer_err_info *e_info)
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{
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int pos;
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u32 status, mask;
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u16 reg16;
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/*
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* When bus id is equal to 0, it might be a bad id
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* reported by root port.
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*/
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if ((PCI_BUS_NUM(e_info->id) != 0) &&
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!(dev->bus->bus_flags & PCI_BUS_FLAGS_NO_AERSID)) {
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/* Device ID match? */
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if (e_info->id == ((dev->bus->number << 8) | dev->devfn))
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return true;
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/* Continue id comparing if there is no multiple error */
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if (!e_info->multi_error_valid)
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return false;
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}
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/*
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* When either
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* 1) bus id is equal to 0. Some ports might lose the bus
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* id of error source id;
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* 2) bus flag PCI_BUS_FLAGS_NO_AERSID is set
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* 3) There are multiple errors and prior ID comparing fails;
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* We check AER status registers to find possible reporter.
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*/
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if (atomic_read(&dev->enable_cnt) == 0)
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return false;
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/* Check if AER is enabled */
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pcie_capability_read_word(dev, PCI_EXP_DEVCTL, ®16);
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if (!(reg16 & PCI_EXP_AER_FLAGS))
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return false;
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pos = dev->aer_cap;
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if (!pos)
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return false;
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/* Check if error is recorded */
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if (e_info->severity == AER_CORRECTABLE) {
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pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
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pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &mask);
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} else {
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pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
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pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &mask);
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}
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if (status & ~mask)
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return true;
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return false;
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}
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static int find_device_iter(struct pci_dev *dev, void *data)
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{
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struct aer_err_info *e_info = (struct aer_err_info *)data;
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if (is_error_source(dev, e_info)) {
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/* List this device */
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if (add_error_device(e_info, dev)) {
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/* We cannot handle more... Stop iteration */
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/* TODO: Should print error message here? */
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return 1;
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}
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/* If there is only a single error, stop iteration */
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if (!e_info->multi_error_valid)
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return 1;
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}
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return 0;
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}
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/**
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* find_source_device - search through device hierarchy for source device
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* @parent: pointer to Root Port pci_dev data structure
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* @e_info: including detailed error information such like id
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*
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* Return true if found.
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*
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* Invoked by DPC when error is detected at the Root Port.
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* Caller of this function must set id, severity, and multi_error_valid of
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* struct aer_err_info pointed by @e_info properly. This function must fill
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* e_info->error_dev_num and e_info->dev[], based on the given information.
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*/
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static bool find_source_device(struct pci_dev *parent,
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struct aer_err_info *e_info)
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{
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struct pci_dev *dev = parent;
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int result;
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/* Must reset in this function */
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e_info->error_dev_num = 0;
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/* Is Root Port an agent that sends error message? */
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result = find_device_iter(dev, e_info);
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if (result)
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return true;
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pci_walk_bus(parent->subordinate, find_device_iter, e_info);
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if (!e_info->error_dev_num) {
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pci_printk(KERN_DEBUG, parent, "can't find device of ID%04x\n",
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e_info->id);
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return false;
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}
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return true;
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}
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/**
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* handle_error_source - handle logging error into an event log
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* @dev: pointer to pci_dev data structure of error source device
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* @info: comprehensive error information
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*
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* Invoked when an error being detected by Root Port.
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*/
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static void handle_error_source(struct pci_dev *dev, struct aer_err_info *info)
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{
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int pos;
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if (info->severity == AER_CORRECTABLE) {
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/*
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* Correctable error does not need software intervention.
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* No need to go through error recovery process.
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*/
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pos = dev->aer_cap;
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if (pos)
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pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
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info->status);
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} else if (info->severity == AER_NONFATAL)
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pcie_do_nonfatal_recovery(dev);
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else if (info->severity == AER_FATAL)
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pcie_do_fatal_recovery(dev, PCIE_PORT_SERVICE_AER);
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}
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#ifdef CONFIG_ACPI_APEI_PCIEAER
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#define AER_RECOVER_RING_ORDER 4
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#define AER_RECOVER_RING_SIZE (1 << AER_RECOVER_RING_ORDER)
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struct aer_recover_entry {
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u8 bus;
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u8 devfn;
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u16 domain;
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int severity;
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struct aer_capability_regs *regs;
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};
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static DEFINE_KFIFO(aer_recover_ring, struct aer_recover_entry,
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AER_RECOVER_RING_SIZE);
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static void aer_recover_work_func(struct work_struct *work)
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{
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struct aer_recover_entry entry;
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struct pci_dev *pdev;
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while (kfifo_get(&aer_recover_ring, &entry)) {
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pdev = pci_get_domain_bus_and_slot(entry.domain, entry.bus,
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entry.devfn);
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if (!pdev) {
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pr_err("AER recover: Can not find pci_dev for %04x:%02x:%02x:%x\n",
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entry.domain, entry.bus,
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PCI_SLOT(entry.devfn), PCI_FUNC(entry.devfn));
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continue;
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}
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cper_print_aer(pdev, entry.severity, entry.regs);
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if (entry.severity == AER_NONFATAL)
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pcie_do_nonfatal_recovery(pdev);
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else if (entry.severity == AER_FATAL)
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pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_AER);
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pci_dev_put(pdev);
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}
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}
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/*
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* Mutual exclusion for writers of aer_recover_ring, reader side don't
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* need lock, because there is only one reader and lock is not needed
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* between reader and writer.
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*/
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static DEFINE_SPINLOCK(aer_recover_ring_lock);
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static DECLARE_WORK(aer_recover_work, aer_recover_work_func);
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void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
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int severity, struct aer_capability_regs *aer_regs)
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{
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unsigned long flags;
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struct aer_recover_entry entry = {
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.bus = bus,
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.devfn = devfn,
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.domain = domain,
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.severity = severity,
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.regs = aer_regs,
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};
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spin_lock_irqsave(&aer_recover_ring_lock, flags);
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if (kfifo_put(&aer_recover_ring, entry))
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schedule_work(&aer_recover_work);
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else
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pr_err("AER recover: Buffer overflow when recovering AER for %04x:%02x:%02x:%x\n",
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domain, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
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spin_unlock_irqrestore(&aer_recover_ring_lock, flags);
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}
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EXPORT_SYMBOL_GPL(aer_recover_queue);
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#endif
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/**
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* get_device_error_info - read error status from dev and store it to info
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* @dev: pointer to the device expected to have a error record
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* @info: pointer to structure to store the error record
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*
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* Return 1 on success, 0 on error.
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*
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* Note that @info is reused among all error devices. Clear fields properly.
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*/
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static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
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{
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int pos, temp;
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/* Must reset in this function */
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info->status = 0;
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info->tlp_header_valid = 0;
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pos = dev->aer_cap;
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/* The device might not support AER */
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if (!pos)
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return 0;
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if (info->severity == AER_CORRECTABLE) {
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pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS,
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&info->status);
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pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK,
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&info->mask);
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if (!(info->status & ~info->mask))
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return 0;
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} else if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
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info->severity == AER_NONFATAL) {
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/* Link is still healthy for IO reads */
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pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
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&info->status);
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pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK,
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&info->mask);
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if (!(info->status & ~info->mask))
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return 0;
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/* Get First Error Pointer */
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pci_read_config_dword(dev, pos + PCI_ERR_CAP, &temp);
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info->first_error = PCI_ERR_CAP_FEP(temp);
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if (info->status & AER_LOG_TLP_MASKS) {
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info->tlp_header_valid = 1;
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pci_read_config_dword(dev,
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pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0);
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pci_read_config_dword(dev,
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pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1);
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pci_read_config_dword(dev,
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pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2);
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pci_read_config_dword(dev,
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pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3);
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}
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}
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return 1;
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}
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static inline void aer_process_err_devices(struct aer_err_info *e_info)
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{
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int i;
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/* Report all before handle them, not to lost records by reset etc. */
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for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
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if (get_device_error_info(e_info->dev[i], e_info))
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aer_print_error(e_info->dev[i], e_info);
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}
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for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
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if (get_device_error_info(e_info->dev[i], e_info))
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handle_error_source(e_info->dev[i], e_info);
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}
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}
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/**
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* aer_isr_one_error - consume an error detected by root port
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* @rpc: pointer to the root port which holds an error
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* @e_src: pointer to an error source
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*/
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static void aer_isr_one_error(struct aer_rpc *rpc,
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struct aer_err_source *e_src)
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{
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struct pci_dev *pdev = rpc->rpd;
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struct aer_err_info *e_info = &rpc->e_info;
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/*
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* There is a possibility that both correctable error and
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* uncorrectable error being logged. Report correctable error first.
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*/
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if (e_src->status & PCI_ERR_ROOT_COR_RCV) {
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e_info->id = ERR_COR_ID(e_src->id);
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e_info->severity = AER_CORRECTABLE;
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if (e_src->status & PCI_ERR_ROOT_MULTI_COR_RCV)
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e_info->multi_error_valid = 1;
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else
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e_info->multi_error_valid = 0;
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aer_print_port_info(pdev, e_info);
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if (find_source_device(pdev, e_info))
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aer_process_err_devices(e_info);
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}
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if (e_src->status & PCI_ERR_ROOT_UNCOR_RCV) {
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e_info->id = ERR_UNCOR_ID(e_src->id);
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if (e_src->status & PCI_ERR_ROOT_FATAL_RCV)
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e_info->severity = AER_FATAL;
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else
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e_info->severity = AER_NONFATAL;
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if (e_src->status & PCI_ERR_ROOT_MULTI_UNCOR_RCV)
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e_info->multi_error_valid = 1;
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else
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e_info->multi_error_valid = 0;
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aer_print_port_info(pdev, e_info);
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if (find_source_device(pdev, e_info))
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aer_process_err_devices(e_info);
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}
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}
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/**
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* get_e_source - retrieve an error source
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* @rpc: pointer to the root port which holds an error
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||||
* @e_src: pointer to store retrieved error source
|
||||
*
|
||||
* Return 1 if an error source is retrieved, otherwise 0.
|
||||
*
|
||||
* Invoked by DPC handler to consume an error.
|
||||
*/
|
||||
static int get_e_source(struct aer_rpc *rpc, struct aer_err_source *e_src)
|
||||
{
|
||||
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 0;
|
||||
}
|
||||
|
||||
*e_src = 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 1;
|
||||
}
|
||||
|
||||
/**
|
||||
* aer_isr - consume errors detected by root port
|
||||
* @work: definition of this work item
|
||||
*
|
||||
* Invoked, as DPC, when root port records new detected error
|
||||
*/
|
||||
static void aer_isr(struct work_struct *work)
|
||||
{
|
||||
struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler);
|
||||
struct aer_err_source uninitialized_var(e_src);
|
||||
|
||||
mutex_lock(&rpc->rpc_mutex);
|
||||
while (get_e_source(rpc, &e_src))
|
||||
aer_isr_one_error(rpc, &e_src);
|
||||
mutex_unlock(&rpc->rpc_mutex);
|
||||
}
|
||||
|
||||
/**
|
||||
* aer_irq - Root Port's ISR
|
||||
* @irq: IRQ assigned to Root Port
|
||||
|
|
|
|||
|
|
@ -77,7 +77,6 @@ struct aer_rpc {
|
|||
};
|
||||
|
||||
extern struct bus_type pcie_port_bus_type;
|
||||
void aer_isr(struct work_struct *work);
|
||||
void aer_print_error(struct pci_dev *dev, struct aer_err_info *info);
|
||||
void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info);
|
||||
irqreturn_t aer_irq(int irq, void *context);
|
||||
|
|
|
|||
|
|
@ -1,496 +0,0 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* Implement the core part of PCIe AER. When a PCIe 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 <linux/slab.h>
|
||||
#include <linux/kfifo.h>
|
||||
#include "aerdrv.h"
|
||||
#include "../../pci.h"
|
||||
|
||||
#define PCI_EXP_AER_FLAGS (PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE | \
|
||||
PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE)
|
||||
|
||||
int pci_enable_pcie_error_reporting(struct pci_dev *dev)
|
||||
{
|
||||
if (pcie_aer_get_firmware_first(dev))
|
||||
return -EIO;
|
||||
|
||||
if (!dev->aer_cap)
|
||||
return -EIO;
|
||||
|
||||
return pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_AER_FLAGS);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
|
||||
|
||||
int pci_disable_pcie_error_reporting(struct pci_dev *dev)
|
||||
{
|
||||
if (pcie_aer_get_firmware_first(dev))
|
||||
return -EIO;
|
||||
|
||||
return pcie_capability_clear_word(dev, PCI_EXP_DEVCTL,
|
||||
PCI_EXP_AER_FLAGS);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
|
||||
|
||||
int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
|
||||
{
|
||||
int pos;
|
||||
u32 status;
|
||||
|
||||
pos = dev->aer_cap;
|
||||
if (!pos)
|
||||
return -EIO;
|
||||
|
||||
pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
|
||||
if (status)
|
||||
pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status);
|
||||
|
||||
int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
|
||||
{
|
||||
int pos;
|
||||
u32 status;
|
||||
int port_type;
|
||||
|
||||
if (!pci_is_pcie(dev))
|
||||
return -ENODEV;
|
||||
|
||||
pos = dev->aer_cap;
|
||||
if (!pos)
|
||||
return -EIO;
|
||||
|
||||
port_type = pci_pcie_type(dev);
|
||||
if (port_type == PCI_EXP_TYPE_ROOT_PORT) {
|
||||
pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &status);
|
||||
pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, status);
|
||||
}
|
||||
|
||||
pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
|
||||
pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, status);
|
||||
|
||||
pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
|
||||
pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int pci_aer_init(struct pci_dev *dev)
|
||||
{
|
||||
dev->aer_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
|
||||
return pci_cleanup_aer_error_status_regs(dev);
|
||||
}
|
||||
|
||||
/**
|
||||
* 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] = 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 pos;
|
||||
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;
|
||||
|
||||
pos = dev->aer_cap;
|
||||
if (!pos)
|
||||
return false;
|
||||
|
||||
/* Check if error is recorded */
|
||||
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);
|
||||
} 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)
|
||||
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_printk(KERN_DEBUG, 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 pos;
|
||||
|
||||
if (info->severity == AER_CORRECTABLE) {
|
||||
/*
|
||||
* Correctable error does not need software intervention.
|
||||
* No need to go through error recovery process.
|
||||
*/
|
||||
pos = dev->aer_cap;
|
||||
if (pos)
|
||||
pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
|
||||
info->status);
|
||||
} else if (info->severity == AER_NONFATAL)
|
||||
pcie_do_nonfatal_recovery(dev);
|
||||
else if (info->severity == AER_FATAL)
|
||||
pcie_do_fatal_recovery(dev, PCIE_PORT_SERVICE_AER);
|
||||
}
|
||||
|
||||
#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_nonfatal_recovery(pdev);
|
||||
else if (entry.severity == AER_FATAL)
|
||||
pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_AER);
|
||||
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)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct aer_recover_entry entry = {
|
||||
.bus = bus,
|
||||
.devfn = devfn,
|
||||
.domain = domain,
|
||||
.severity = severity,
|
||||
.regs = aer_regs,
|
||||
};
|
||||
|
||||
spin_lock_irqsave(&aer_recover_ring_lock, flags);
|
||||
if (kfifo_put(&aer_recover_ring, entry))
|
||||
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));
|
||||
spin_unlock_irqrestore(&aer_recover_ring_lock, flags);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(aer_recover_queue);
|
||||
#endif
|
||||
|
||||
/**
|
||||
* 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.
|
||||
*/
|
||||
static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
|
||||
{
|
||||
int pos, temp;
|
||||
|
||||
/* Must reset in this function */
|
||||
info->status = 0;
|
||||
info->tlp_header_valid = 0;
|
||||
|
||||
pos = dev->aer_cap;
|
||||
|
||||
/* The device might not support AER */
|
||||
if (!pos)
|
||||
return 0;
|
||||
|
||||
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 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 (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(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 = &rpc->e_info;
|
||||
|
||||
/*
|
||||
* 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);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* get_e_source - retrieve an error source
|
||||
* @rpc: pointer to the root port which holds an error
|
||||
* @e_src: pointer to store retrieved error source
|
||||
*
|
||||
* Return 1 if an error source is retrieved, otherwise 0.
|
||||
*
|
||||
* Invoked by DPC handler to consume an error.
|
||||
*/
|
||||
static int get_e_source(struct aer_rpc *rpc, struct aer_err_source *e_src)
|
||||
{
|
||||
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 0;
|
||||
}
|
||||
|
||||
*e_src = 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 1;
|
||||
}
|
||||
|
||||
/**
|
||||
* 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 aer_err_source uninitialized_var(e_src);
|
||||
|
||||
mutex_lock(&rpc->rpc_mutex);
|
||||
while (get_e_source(rpc, &e_src))
|
||||
aer_isr_one_error(rpc, &e_src);
|
||||
mutex_unlock(&rpc->rpc_mutex);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user