/*

   * (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/edac.h>

  #include <linux/slab.h>

  #include <linux/ctype.h>

  #include "edac_pci.h"

  #include "edac_module.h"

  #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
  ", 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
  ", 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;

  	edac_dbg(0, "
  ");

  	/* 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 const 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;

  	edac_dbg(0, "
  ");

  	/* 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) {

  		edac_dbg(2, "failed to register instance pci%d
  ", idx);

  		kobject_put(edac_pci_top_main_kobj);

  		goto error_out;

  	}

  	kobject_uevent(&pci->kobj, KOBJ_ADD);

  	edac_dbg(1, "Register instance 'pci%d' kobject
  ", 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)

  {

  	edac_dbg(0, "
  ");

  
  	/* 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
  ", *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->store)

  		return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
  	return -EIO;
  }

  static const 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)

  {

  	edac_dbg(0, "here to module_put(THIS_MODULE)
  ");

  	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.

   */

  static int edac_pci_main_kobj_setup(void)

  {
  	int err;

  	struct bus_type *edac_subsys;

  	edac_dbg(0, "
  ");

  
  	/* 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 attributes

  	 */

  	edac_subsys = edac_get_sysfs_subsys();

  	/* 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)) {

  		edac_dbg(1, "try_module_get() failed
  ");

  		err = -ENODEV;

  		goto decrement_count_fail;

  	}

  	edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
  	if (!edac_pci_top_main_kobj) {

  		edac_dbg(1, "Failed to allocate
  ");

  		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_subsys->dev_root->kobj, "pci");

  	if (err) {

  		edac_dbg(1, "Failed to register '.../edac/pci'
  ");

  		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);

  	edac_dbg(1, "Registered '.../edac/pci' kobject
  ");

  
  	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)

  {

  	edac_dbg(0, "
  ");

  
  	/* 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) {

  		edac_dbg(0, "called kobject_put on main kobj
  ");

  		kobject_put(edac_pci_top_main_kobj);

  	}

  }

  int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci)
  {
  	int err;
  	struct kobject *edac_kobj = &pci->kobj;

  	edac_dbg(0, "idx=%d
  ", 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) {

  		edac_dbg(0, "sysfs_create_link() returned err= %d
  ", 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;

  }
  
  void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci)
  {

  	edac_dbg(0, "index=%d
  ", 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
  	 */

  	edac_dbg(0, "calling edac_pci_main_kobj_teardown()
  ");

  	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;
  
  	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
   *

   *	Function 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);

  	edac_dbg(4, "PCI STATUS= 0x%04x %s
  ", status, dev_name(&dev->dev));

  	/* 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
  ",
  				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
  ",
  				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
  ",
  				pci_name(dev));

  
  			atomic_inc(&pci_parity_count);
  		}
  	}

  	edac_dbg(4, "PCI HEADER TYPE= 0x%02x %s
  ",
  		 header_type, dev_name(&dev->dev));

  
  	if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
  		/* On bridges, need to examine secondary status register  */
  		status = get_pci_parity_status(dev, 1);

  		edac_dbg(4, "PCI SEC_STATUS= 0x%04x %s
  ",
  			 status, dev_name(&dev->dev));

  		/* 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
  ",
  					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
  ", 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
  ",
  					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 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;

  	for_each_pci_dev(dev)

  		fn(dev);

  }
  
  /*
   * edac_pci_do_parity_check
   *
   *	performs the actual PCI parity check operation
   */
  void edac_pci_do_parity_check(void)
  {

  	int before_count;

  	edac_dbg(3, "
  ");

  	/* 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
  ",
  				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
  ",
  				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");