path: root/drivers/edac/edac_pci_sysfs.c

/*
 * (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\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;

	edac_dbg(0, "\n");

	/* 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, "\n");

	/* 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\n", 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\n", 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, "\n");

	/* 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