diff options
| -rw-r--r-- | Documentation/PCI/pcieaer-howto.txt | 4 | ||||
| -rw-r--r-- | drivers/pci/pcie/aer/aerdrv.h | 2 | ||||
| -rw-r--r-- | drivers/pci/pcie/aer/aerdrv_core.c | 176 |
3 files changed, 122 insertions, 60 deletions
diff --git a/Documentation/PCI/pcieaer-howto.txt b/Documentation/PCI/pcieaer-howto.txt index f6b1ba7..5408b9b 100644 --- a/Documentation/PCI/pcieaer-howto.txt +++ b/Documentation/PCI/pcieaer-howto.txt @@ -61,6 +61,10 @@ be initiated although firmwares have no _OSC support. To enable the walkaround, pls. add aerdriver.forceload=y to kernel boot parameter line when booting kernel. Note that forceload=n by default. +nosourceid, another parameter of type bool, can be used when broken +hardware (mostly chipsets) has root ports that cannot obtain the reporting +source ID. nosourceid=n by default. + 2.3 AER error output When a PCI-E AER error is captured, an error message will be outputed to console. If it's a correctable error, it is outputed as a warning. diff --git a/drivers/pci/pcie/aer/aerdrv.h b/drivers/pci/pcie/aer/aerdrv.h index 3a69dde..dadf492 100644 --- a/drivers/pci/pcie/aer/aerdrv.h +++ b/drivers/pci/pcie/aer/aerdrv.h @@ -58,6 +58,8 @@ struct header_log_regs { }; struct aer_err_info { + struct pci_dev *dev; + u16 id; int severity; /* 0:NONFATAL | 1:FATAL | 2:COR */ int flags; unsigned int status; /* COR/UNCOR Error Status */ diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c index a7a3919..2750e7b 100644 --- a/drivers/pci/pcie/aer/aerdrv_core.c +++ b/drivers/pci/pcie/aer/aerdrv_core.c @@ -26,7 +26,9 @@ #include "aerdrv.h" static int forceload; +static int nosourceid; module_param(forceload, bool, 0); +module_param(nosourceid, bool, 0); int pci_enable_pcie_error_reporting(struct pci_dev *dev) { @@ -143,34 +145,87 @@ static void set_downstream_devices_error_reporting(struct pci_dev *dev, pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable); } -static int find_device_iter(struct device *device, void *data) +static inline int compare_device_id(struct pci_dev *dev, + struct aer_err_info *e_info) { - struct pci_dev *dev; - u16 id = *(unsigned long *)data; - u8 secondary, subordinate, d_bus = id >> 8; + if (e_info->id == ((dev->bus->number << 8) | dev->devfn)) { + /* + * Device ID match + */ + return 1; + } - if (device->bus == &pci_bus_type) { - dev = to_pci_dev(device); - if (id == ((dev->bus->number << 8) | dev->devfn)) { - /* - * Device ID match - */ - *(unsigned long*)data = (unsigned long)device; + return 0; +} + +#define PCI_BUS(x) (((x) >> 8) & 0xff) + +static int find_device_iter(struct pci_dev *dev, void *data) +{ + int pos; + u32 status; + u32 mask; + u16 reg16; + int result; + struct aer_err_info *e_info = (struct aer_err_info *)data; + + /* + * When bus id is equal to 0, it might be a bad id + * reported by root port. + */ + if (!nosourceid && (PCI_BUS(e_info->id) != 0)) { + result = compare_device_id(dev, e_info); + if (result) + e_info->dev = dev; + return result; + } + + /* + * Next is to check when bus id is equal to 0 or + * nosourceid==y. Some ports might lose the bus + * id of error source id. We check AER status + * registers to find the initial reporter. + */ + if (atomic_read(&dev->enable_cnt) == 0) + return 0; + pos = pci_find_capability(dev, PCI_CAP_ID_EXP); + if (!pos) + return 0; + /* Check if AER is enabled */ + pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16); + if (!(reg16 & ( + PCI_EXP_DEVCTL_CERE | + PCI_EXP_DEVCTL_NFERE | + PCI_EXP_DEVCTL_FERE | + PCI_EXP_DEVCTL_URRE))) + return 0; + pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); + if (!pos) + return 0; + + status = 0; + mask = 0; + if (e_info->severity == AER_CORRECTABLE) { + pci_read_config_dword(dev, + pos + PCI_ERR_COR_STATUS, + &status); + pci_read_config_dword(dev, + pos + PCI_ERR_COR_MASK, + &mask); + if (status & ERR_CORRECTABLE_ERROR_MASK & ~mask) { + e_info->dev = dev; return 1; } - - /* - * If device is P2P, check if it is an upstream? - */ - if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) { - pci_read_config_byte(dev, PCI_SECONDARY_BUS, - &secondary); - pci_read_config_byte(dev, PCI_SUBORDINATE_BUS, - &subordinate); - if (d_bus >= secondary && d_bus <= subordinate) { - *(unsigned long*)data = (unsigned long)device; - return 1; - } + } 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 & ERR_UNCORRECTABLE_ERROR_MASK & ~mask) { + e_info->dev = dev; + return 1; } } @@ -180,33 +235,22 @@ static int find_device_iter(struct device *device, void *data) /** * find_source_device - search through device hierarchy for source device * @parent: pointer to Root Port pci_dev data structure - * @id: device ID of agent who sends an error message to this Root Port + * @err_info: including detailed error information such like id * * Invoked when error is detected at the Root Port. */ -static struct device* find_source_device(struct pci_dev *parent, u16 id) +static void find_source_device(struct pci_dev *parent, + struct aer_err_info *e_info) { struct pci_dev *dev = parent; - struct device *device; - unsigned long device_addr; - int status; + int result; /* Is Root Port an agent that sends error message? */ - if (id == ((dev->bus->number << 8) | dev->devfn)) - return &dev->dev; - - do { - device_addr = id; - if ((status = device_for_each_child(&dev->dev, - &device_addr, find_device_iter))) { - device = (struct device*)device_addr; - dev = to_pci_dev(device); - if (id == ((dev->bus->number << 8) | dev->devfn)) - return device; - } - }while (status); + result = find_device_iter(dev, e_info); + if (result) + return; - return NULL; + pci_walk_bus(parent->subordinate, find_device_iter, e_info); } static int report_error_detected(struct pci_dev *dev, void *data) @@ -501,12 +545,12 @@ static pci_ers_result_t do_recovery(struct pcie_device *aerdev, */ static void handle_error_source(struct pcie_device * aerdev, struct pci_dev *dev, - struct aer_err_info info) + struct aer_err_info *info) { pci_ers_result_t status = 0; int pos; - if (info.severity == AER_CORRECTABLE) { + if (info->severity == AER_CORRECTABLE) { /* * Correctable error does not need software intevention. * No need to go through error recovery process. @@ -514,9 +558,9 @@ static void handle_error_source(struct pcie_device * aerdev, pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); if (pos) pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, - info.status); + info->status); } else { - status = do_recovery(aerdev, dev, info.severity); + status = do_recovery(aerdev, dev, info->severity); if (status == PCI_ERS_RESULT_RECOVERED) { dev_printk(KERN_DEBUG, &dev->dev, "AER driver " "successfully recovered\n"); @@ -673,10 +717,16 @@ static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info) static void aer_isr_one_error(struct pcie_device *p_device, struct aer_err_source *e_src) { - struct device *s_device; - struct aer_err_info e_info = {0, 0, 0,}; + struct aer_err_info *e_info; int i; - u16 id; + + /* struct aer_err_info might be big, so we allocate it with slab */ + e_info = kmalloc(sizeof(struct aer_err_info), GFP_KERNEL); + if (e_info == NULL) { + dev_printk(KERN_DEBUG, &p_device->port->dev, + "Can't allocate mem when processing AER errors\n"); + return; + } /* * There is a possibility that both correctable error and @@ -688,31 +738,37 @@ static void aer_isr_one_error(struct pcie_device *p_device, if (!(e_src->status & i)) continue; + memset(e_info, 0, sizeof(struct aer_err_info)); + /* Init comprehensive error information */ if (i & PCI_ERR_ROOT_COR_RCV) { - id = ERR_COR_ID(e_src->id); - e_info.severity = AER_CORRECTABLE; + e_info->id = ERR_COR_ID(e_src->id); + e_info->severity = AER_CORRECTABLE; } else { - id = ERR_UNCOR_ID(e_src->id); - e_info.severity = ((e_src->status >> 6) & 1); + e_info->id = ERR_UNCOR_ID(e_src->id); + e_info->severity = ((e_src->status >> 6) & 1); } if (e_src->status & (PCI_ERR_ROOT_MULTI_COR_RCV | PCI_ERR_ROOT_MULTI_UNCOR_RCV)) - e_info.flags |= AER_MULTI_ERROR_VALID_FLAG; - if (!(s_device = find_source_device(p_device->port, id))) { + e_info->flags |= AER_MULTI_ERROR_VALID_FLAG; + + find_source_device(p_device->port, e_info); + if (e_info->dev == NULL) { printk(KERN_DEBUG "%s->can't find device of ID%04x\n", - __func__, id); + __func__, e_info->id); continue; } - if (get_device_error_info(to_pci_dev(s_device), &e_info) == + if (get_device_error_info(e_info->dev, e_info) == AER_SUCCESS) { - aer_print_error(to_pci_dev(s_device), &e_info); + aer_print_error(e_info->dev, e_info); handle_error_source(p_device, - to_pci_dev(s_device), + e_info->dev, e_info); } } + + kfree(e_info); } /** |
