diff options
Diffstat (limited to 'drivers/edac/edac_pci_sysfs.c')
| -rw-r--r-- | drivers/edac/edac_pci_sysfs.c | 767 |
1 files changed, 767 insertions, 0 deletions
diff --git a/drivers/edac/edac_pci_sysfs.c b/drivers/edac/edac_pci_sysfs.c new file mode 100644 index 0000000..5c153dc --- /dev/null +++ b/drivers/edac/edac_pci_sysfs.c @@ -0,0 +1,767 @@ +/* + * (C) 2005, 2006 Linux Networx (http://lnxi.com) + * This file may be distributed under the terms of the + * GNU General Public License. + * + * Written Doug Thompson <norsk5@xmission.com> + * + */ +#include <linux/module.h> +#include <linux/sysdev.h> +#include <linux/ctype.h> + +#include "edac_core.h" +#include "edac_module.h" + +/* Turn off this whole feature if PCI is not configured */ +#ifdef CONFIG_PCI + +#define EDAC_PCI_SYMLINK "device" + +/* data variables exported via sysfs */ +static int check_pci_errors; /* default NO check PCI parity */ +static int edac_pci_panic_on_pe; /* default NO panic on PCI Parity */ +static int edac_pci_log_pe = 1; /* log PCI parity errors */ +static int edac_pci_log_npe = 1; /* log PCI non-parity error errors */ +static int edac_pci_poll_msec = 1000; /* one second workq period */ + +static atomic_t pci_parity_count = ATOMIC_INIT(0); +static atomic_t pci_nonparity_count = ATOMIC_INIT(0); + +static struct kobject *edac_pci_top_main_kobj; +static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0); + +/* getter functions for the data variables */ +int edac_pci_get_check_errors(void) +{ + return check_pci_errors; +} + +static int edac_pci_get_log_pe(void) +{ + return edac_pci_log_pe; +} + +static int edac_pci_get_log_npe(void) +{ + return edac_pci_log_npe; +} + +static int edac_pci_get_panic_on_pe(void) +{ + return edac_pci_panic_on_pe; +} + +int edac_pci_get_poll_msec(void) +{ + return edac_pci_poll_msec; +} + +/**************************** EDAC PCI sysfs instance *******************/ +static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data) +{ + return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count)); +} + +static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci, + char *data) +{ + return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count)); +} + +#define to_instance(k) container_of(k, struct edac_pci_ctl_info, kobj) +#define to_instance_attr(a) container_of(a, struct instance_attribute, attr) + +/* DEVICE instance kobject release() function */ +static void edac_pci_instance_release(struct kobject *kobj) +{ + struct edac_pci_ctl_info *pci; + + debugf0("%s()\n", __func__); + + /* Form pointer to containing struct, the pci control struct */ + pci = to_instance(kobj); + + /* decrement reference count on top main kobj */ + kobject_put(edac_pci_top_main_kobj); + + kfree(pci); /* Free the control struct */ +} + +/* instance specific attribute structure */ +struct instance_attribute { + struct attribute attr; + ssize_t(*show) (struct edac_pci_ctl_info *, char *); + ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t); +}; + +/* Function to 'show' fields from the edac_pci 'instance' structure */ +static ssize_t edac_pci_instance_show(struct kobject *kobj, + struct attribute *attr, char *buffer) +{ + struct edac_pci_ctl_info *pci = to_instance(kobj); + struct instance_attribute *instance_attr = to_instance_attr(attr); + + if (instance_attr->show) + return instance_attr->show(pci, buffer); + return -EIO; +} + +/* Function to 'store' fields into the edac_pci 'instance' structure */ +static ssize_t edac_pci_instance_store(struct kobject *kobj, + struct attribute *attr, + const char *buffer, size_t count) +{ + struct edac_pci_ctl_info *pci = to_instance(kobj); + struct instance_attribute *instance_attr = to_instance_attr(attr); + + if (instance_attr->store) + return instance_attr->store(pci, buffer, count); + return -EIO; +} + +/* fs_ops table */ +static struct sysfs_ops pci_instance_ops = { + .show = edac_pci_instance_show, + .store = edac_pci_instance_store +}; + +#define INSTANCE_ATTR(_name, _mode, _show, _store) \ +static struct instance_attribute attr_instance_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode }, \ + .show = _show, \ + .store = _store, \ +}; + +INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL); +INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL); + +/* pci instance attributes */ +static struct instance_attribute *pci_instance_attr[] = { + &attr_instance_pe_count, + &attr_instance_npe_count, + NULL +}; + +/* the ktype for a pci instance */ +static struct kobj_type ktype_pci_instance = { + .release = edac_pci_instance_release, + .sysfs_ops = &pci_instance_ops, + .default_attrs = (struct attribute **)pci_instance_attr, +}; + +/* + * edac_pci_create_instance_kobj + * + * construct one EDAC PCI instance's kobject for use + */ +static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx) +{ + struct kobject *main_kobj; + int err; + + debugf0("%s()\n", __func__); + + /* First bump the ref count on the top main kobj, which will + * track the number of PCI instances we have, and thus nest + * properly on keeping the module loaded + */ + main_kobj = kobject_get(edac_pci_top_main_kobj); + if (!main_kobj) { + err = -ENODEV; + goto error_out; + } + + /* And now register this new kobject under the main kobj */ + err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance, + edac_pci_top_main_kobj, "pci%d", idx); + if (err != 0) { + debugf2("%s() failed to register instance pci%d\n", + __func__, idx); + kobject_put(edac_pci_top_main_kobj); + goto error_out; + } + + kobject_uevent(&pci->kobj, KOBJ_ADD); + debugf1("%s() Register instance 'pci%d' kobject\n", __func__, idx); + + return 0; + + /* Error unwind statck */ +error_out: + return err; +} + +/* + * edac_pci_unregister_sysfs_instance_kobj + * + * unregister the kobj for the EDAC PCI instance + */ +static void edac_pci_unregister_sysfs_instance_kobj( + struct edac_pci_ctl_info *pci) +{ + debugf0("%s()\n", __func__); + + /* Unregister the instance kobject and allow its release + * function release the main reference count and then + * kfree the memory + */ + kobject_put(&pci->kobj); +} + +/***************************** EDAC PCI sysfs root **********************/ +#define to_edacpci(k) container_of(k, struct edac_pci_ctl_info, kobj) +#define to_edacpci_attr(a) container_of(a, struct edac_pci_attr, attr) + +/* simple show/store functions for attributes */ +static ssize_t edac_pci_int_show(void *ptr, char *buffer) +{ + int *value = ptr; + return sprintf(buffer, "%d\n", *value); +} + +static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count) +{ + int *value = ptr; + + if (isdigit(*buffer)) + *value = simple_strtoul(buffer, NULL, 0); + + return count; +} + +struct edac_pci_dev_attribute { + struct attribute attr; + void *value; + ssize_t(*show) (void *, char *); + ssize_t(*store) (void *, const char *, size_t); +}; + +/* Set of show/store abstract level functions for PCI Parity object */ +static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr, + char *buffer) +{ + struct edac_pci_dev_attribute *edac_pci_dev; + edac_pci_dev = (struct edac_pci_dev_attribute *)attr; + + if (edac_pci_dev->show) + return edac_pci_dev->show(edac_pci_dev->value, buffer); + return -EIO; +} + +static ssize_t edac_pci_dev_store(struct kobject *kobj, + struct attribute *attr, const char *buffer, + size_t count) +{ + struct edac_pci_dev_attribute *edac_pci_dev; + edac_pci_dev = (struct edac_pci_dev_attribute *)attr; + + if (edac_pci_dev->show) + return edac_pci_dev->store(edac_pci_dev->value, buffer, count); + return -EIO; +} + +static struct sysfs_ops edac_pci_sysfs_ops = { + .show = edac_pci_dev_show, + .store = edac_pci_dev_store +}; + +#define EDAC_PCI_ATTR(_name,_mode,_show,_store) \ +static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode }, \ + .value = &_name, \ + .show = _show, \ + .store = _store, \ +}; + +#define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store) \ +static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode }, \ + .value = _data, \ + .show = _show, \ + .store = _store, \ +}; + +/* PCI Parity control files */ +EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show, + edac_pci_int_store); +EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show, + edac_pci_int_store); +EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show, + edac_pci_int_store); +EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show, + edac_pci_int_store); +EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL); +EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL); + +/* Base Attributes of the memory ECC object */ +static struct edac_pci_dev_attribute *edac_pci_attr[] = { + &edac_pci_attr_check_pci_errors, + &edac_pci_attr_edac_pci_log_pe, + &edac_pci_attr_edac_pci_log_npe, + &edac_pci_attr_edac_pci_panic_on_pe, + &edac_pci_attr_pci_parity_count, + &edac_pci_attr_pci_nonparity_count, + NULL, +}; + +/* + * edac_pci_release_main_kobj + * + * This release function is called when the reference count to the + * passed kobj goes to zero. + * + * This kobj is the 'main' kobject that EDAC PCI instances + * link to, and thus provide for proper nesting counts + */ +static void edac_pci_release_main_kobj(struct kobject *kobj) +{ + debugf0("%s() here to module_put(THIS_MODULE)\n", __func__); + + kfree(kobj); + + /* last reference to top EDAC PCI kobject has been removed, + * NOW release our ref count on the core module + */ + module_put(THIS_MODULE); +} + +/* ktype struct for the EDAC PCI main kobj */ +static struct kobj_type ktype_edac_pci_main_kobj = { + .release = edac_pci_release_main_kobj, + .sysfs_ops = &edac_pci_sysfs_ops, + .default_attrs = (struct attribute **)edac_pci_attr, +}; + +/** + * edac_pci_main_kobj_setup() + * + * setup the sysfs for EDAC PCI attributes + * assumes edac_class has already been initialized + */ +static int edac_pci_main_kobj_setup(void) +{ + int err; + struct sysdev_class *edac_class; + + debugf0("%s()\n", __func__); + + /* check and count if we have already created the main kobject */ + if (atomic_inc_return(&edac_pci_sysfs_refcount) != 1) + return 0; + + /* First time, so create the main kobject and its + * controls and atributes + */ + edac_class = edac_get_edac_class(); + if (edac_class == NULL) { + debugf1("%s() no edac_class\n", __func__); + err = -ENODEV; + goto decrement_count_fail; + } + + /* Bump the reference count on this module to ensure the + * modules isn't unloaded until we deconstruct the top + * level main kobj for EDAC PCI + */ + if (!try_module_get(THIS_MODULE)) { + debugf1("%s() try_module_get() failed\n", __func__); + err = -ENODEV; + goto decrement_count_fail; + } + + edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL); + if (!edac_pci_top_main_kobj) { + debugf1("Failed to allocate\n"); + err = -ENOMEM; + goto kzalloc_fail; + } + + /* Instanstiate the pci object */ + err = kobject_init_and_add(edac_pci_top_main_kobj, + &ktype_edac_pci_main_kobj, + &edac_class->kset.kobj, "pci"); + if (err) { + debugf1("Failed to register '.../edac/pci'\n"); + goto kobject_init_and_add_fail; + } + + /* At this point, to 'release' the top level kobject + * for EDAC PCI, then edac_pci_main_kobj_teardown() + * must be used, for resources to be cleaned up properly + */ + kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD); + debugf1("Registered '.../edac/pci' kobject\n"); + + return 0; + + /* Error unwind statck */ +kobject_init_and_add_fail: + kfree(edac_pci_top_main_kobj); + +kzalloc_fail: + module_put(THIS_MODULE); + +decrement_count_fail: + /* if are on this error exit, nothing to tear down */ + atomic_dec(&edac_pci_sysfs_refcount); + + return err; +} + +/* + * edac_pci_main_kobj_teardown() + * + * if no longer linked (needed) remove the top level EDAC PCI + * kobject with its controls and attributes + */ +static void edac_pci_main_kobj_teardown(void) +{ + debugf0("%s()\n", __func__); + + /* Decrement the count and only if no more controller instances + * are connected perform the unregisteration of the top level + * main kobj + */ + if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) { + debugf0("%s() called kobject_put on main kobj\n", + __func__); + kobject_put(edac_pci_top_main_kobj); + } +} + +/* + * + * edac_pci_create_sysfs + * + * Create the controls/attributes for the specified EDAC PCI device + */ +int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci) +{ + int err; + struct kobject *edac_kobj = &pci->kobj; + + debugf0("%s() idx=%d\n", __func__, pci->pci_idx); + + /* create the top main EDAC PCI kobject, IF needed */ + err = edac_pci_main_kobj_setup(); + if (err) + return err; + + /* Create this instance's kobject under the MAIN kobject */ + err = edac_pci_create_instance_kobj(pci, pci->pci_idx); + if (err) + goto unregister_cleanup; + + err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK); + if (err) { + debugf0("%s() sysfs_create_link() returned err= %d\n", + __func__, err); + goto symlink_fail; + } + + return 0; + + /* Error unwind stack */ +symlink_fail: + edac_pci_unregister_sysfs_instance_kobj(pci); + +unregister_cleanup: + edac_pci_main_kobj_teardown(); + + return err; +} + +/* + * edac_pci_remove_sysfs + * + * remove the controls and attributes for this EDAC PCI device + */ +void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci) +{ + debugf0("%s() index=%d\n", __func__, pci->pci_idx); + + /* Remove the symlink */ + sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK); + + /* remove this PCI instance's sysfs entries */ + edac_pci_unregister_sysfs_instance_kobj(pci); + + /* Call the main unregister function, which will determine + * if this 'pci' is the last instance. + * If it is, the main kobject will be unregistered as a result + */ + debugf0("%s() calling edac_pci_main_kobj_teardown()\n", __func__); + edac_pci_main_kobj_teardown(); +} + +/************************ PCI error handling *************************/ +static u16 get_pci_parity_status(struct pci_dev *dev, int secondary) +{ + int where; + u16 status; + + where = secondary ? PCI_SEC_STATUS : PCI_STATUS; + pci_read_config_word(dev, where, &status); + + /* If we get back 0xFFFF then we must suspect that the card has been + * pulled but the Linux PCI layer has not yet finished cleaning up. + * We don't want to report on such devices + */ + + if (status == 0xFFFF) { + u32 sanity; + + pci_read_config_dword(dev, 0, &sanity); + + if (sanity == 0xFFFFFFFF) + return 0; + } + + status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR | + PCI_STATUS_PARITY; + + if (status) + /* reset only the bits we are interested in */ + pci_write_config_word(dev, where, status); + + return status; +} + + +/* Clear any PCI parity errors logged by this device. */ +static void edac_pci_dev_parity_clear(struct pci_dev *dev) +{ + u8 header_type; + + debugf0("%s()\n", __func__); + + get_pci_parity_status(dev, 0); + + /* read the device TYPE, looking for bridges */ + pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type); + + if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) + get_pci_parity_status(dev, 1); +} + +/* + * PCI Parity polling + * + * Fucntion to retrieve the current parity status + * and decode it + * + */ +static void edac_pci_dev_parity_test(struct pci_dev *dev) +{ + unsigned long flags; + u16 status; + u8 header_type; + + /* stop any interrupts until we can acquire the status */ + local_irq_save(flags); + + /* read the STATUS register on this device */ + status = get_pci_parity_status(dev, 0); + + /* read the device TYPE, looking for bridges */ + pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type); + + local_irq_restore(flags); + + debugf4("PCI STATUS= 0x%04x %s\n", status, dev->dev.bus_id); + + /* check the status reg for errors on boards NOT marked as broken + * if broken, we cannot trust any of the status bits + */ + if (status && !dev->broken_parity_status) { + if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { + edac_printk(KERN_CRIT, EDAC_PCI, + "Signaled System Error on %s\n", + pci_name(dev)); + atomic_inc(&pci_nonparity_count); + } + + if (status & (PCI_STATUS_PARITY)) { + edac_printk(KERN_CRIT, EDAC_PCI, + "Master Data Parity Error on %s\n", + pci_name(dev)); + + atomic_inc(&pci_parity_count); + } + + if (status & (PCI_STATUS_DETECTED_PARITY)) { + edac_printk(KERN_CRIT, EDAC_PCI, + "Detected Parity Error on %s\n", + pci_name(dev)); + + atomic_inc(&pci_parity_count); + } + } + + + debugf4("PCI HEADER TYPE= 0x%02x %s\n", header_type, dev->dev.bus_id); + + if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) { + /* On bridges, need to examine secondary status register */ + status = get_pci_parity_status(dev, 1); + + debugf4("PCI SEC_STATUS= 0x%04x %s\n", status, dev->dev.bus_id); + + /* check the secondary status reg for errors, + * on NOT broken boards + */ + if (status && !dev->broken_parity_status) { + if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { + edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " + "Signaled System Error on %s\n", + pci_name(dev)); + atomic_inc(&pci_nonparity_count); + } + + if (status & (PCI_STATUS_PARITY)) { + edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " + "Master Data Parity Error on " + "%s\n", pci_name(dev)); + + atomic_inc(&pci_parity_count); + } + + if (status & (PCI_STATUS_DETECTED_PARITY)) { + edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " + "Detected Parity Error on %s\n", + pci_name(dev)); + + atomic_inc(&pci_parity_count); + } + } + } +} + +/* reduce some complexity in definition of the iterator */ +typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev); + +/* + * pci_dev parity list iterator + * Scan the PCI device list for one pass, looking for SERRORs + * Master Parity ERRORS or Parity ERRORs on primary or secondary devices + */ +static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn) +{ + struct pci_dev *dev = NULL; + + /* request for kernel access to the next PCI device, if any, + * and while we are looking at it have its reference count + * bumped until we are done with it + */ + while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { + fn(dev); + } +} + +/* + * edac_pci_do_parity_check + * + * performs the actual PCI parity check operation + */ +void edac_pci_do_parity_check(void) +{ + int before_count; + + debugf3("%s()\n", __func__); + + /* if policy has PCI check off, leave now */ + if (!check_pci_errors) + return; + + before_count = atomic_read(&pci_parity_count); + + /* scan all PCI devices looking for a Parity Error on devices and + * bridges. + * The iterator calls pci_get_device() which might sleep, thus + * we cannot disable interrupts in this scan. + */ + edac_pci_dev_parity_iterator(edac_pci_dev_parity_test); + + /* Only if operator has selected panic on PCI Error */ + if (edac_pci_get_panic_on_pe()) { + /* If the count is different 'after' from 'before' */ + if (before_count != atomic_read(&pci_parity_count)) + panic("EDAC: PCI Parity Error"); + } +} + +/* + * edac_pci_clear_parity_errors + * + * function to perform an iteration over the PCI devices + * and clearn their current status + */ +void edac_pci_clear_parity_errors(void) +{ + /* Clear any PCI bus parity errors that devices initially have logged + * in their registers. + */ + edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear); +} + +/* + * edac_pci_handle_pe + * + * Called to handle a PARITY ERROR event + */ +void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg) +{ + + /* global PE counter incremented by edac_pci_do_parity_check() */ + atomic_inc(&pci->counters.pe_count); + + if (edac_pci_get_log_pe()) + edac_pci_printk(pci, KERN_WARNING, + "Parity Error ctl: %s %d: %s\n", + pci->ctl_name, pci->pci_idx, msg); + + /* + * poke all PCI devices and see which one is the troublemaker + * panic() is called if set + */ + edac_pci_do_parity_check(); +} +EXPORT_SYMBOL_GPL(edac_pci_handle_pe); + + +/* + * edac_pci_handle_npe + * + * Called to handle a NON-PARITY ERROR event + */ +void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg) +{ + + /* global NPE counter incremented by edac_pci_do_parity_check() */ + atomic_inc(&pci->counters.npe_count); + + if (edac_pci_get_log_npe()) + edac_pci_printk(pci, KERN_WARNING, + "Non-Parity Error ctl: %s %d: %s\n", + pci->ctl_name, pci->pci_idx, msg); + + /* + * poke all PCI devices and see which one is the troublemaker + * panic() is called if set + */ + edac_pci_do_parity_check(); +} +EXPORT_SYMBOL_GPL(edac_pci_handle_npe); + +/* + * Define the PCI parameter to the module + */ +module_param(check_pci_errors, int, 0644); +MODULE_PARM_DESC(check_pci_errors, + "Check for PCI bus parity errors: 0=off 1=on"); +module_param(edac_pci_panic_on_pe, int, 0644); +MODULE_PARM_DESC(edac_pci_panic_on_pe, + "Panic on PCI Bus Parity error: 0=off 1=on"); + +#endif /* CONFIG_PCI */ |
