drivers/edac: updated PCI monitoring

Moving PCI to a per-instance device model

This should include the correct sysfs setup as well. Please review.

Signed-off-by: Dave Jiang <djiang@mvista.com>
Signed-off-by: Douglas Thompson <dougthompson@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 451 insertions, 0 deletions

diff --git a/drivers/edac/edac_pci.c b/drivers/edac/edac_pci.c
new file mode 100644
index 00000000000..677c603f559
--- /dev/null
+++ b/drivers/edac/edac_pci.c
@@ -0,0 +1,451 @@
+/*
+ * EDAC PCI component
+ *
+ * Author: Dave Jiang <djiang@mvista.com>
+ *
+ * 2007 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ */
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/highmem.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/sysdev.h>
+#include <linux/ctype.h>
+#include <linux/workqueue.h>
+#include <asm/uaccess.h>
+#include <asm/page.h>
+
+#include "edac_core.h"
+#include "edac_module.h"
+
+static DEFINE_MUTEX(edac_pci_ctls_mutex);
+static struct list_head edac_pci_list = LIST_HEAD_INIT(edac_pci_list);
+
+static inline void edac_lock_pci_list(void)
+{
+	mutex_lock(&edac_pci_ctls_mutex);
+}
+
+static inline void edac_unlock_pci_list(void)
+{
+	mutex_unlock(&edac_pci_ctls_mutex);
+}
+
+/*
+ * The alloc() and free() functions for the 'edac_pci' control info
+ * structure. The chip driver will allocate one of these for each
+ * edac_pci it is going to control/register with the EDAC CORE.
+ */
+struct edac_pci_ctl_info * edac_pci_alloc_ctl_info(
+	unsigned int sz_pvt,
+	const char *edac_pci_name)
+{
+	struct edac_pci_ctl_info *pci;
+	void *pvt;
+	unsigned int size;
+
+	pci = (struct edac_pci_ctl_info *)0;
+	pvt = edac_align_ptr(&pci[1], sz_pvt);
+	size = ((unsigned long)pvt) + sz_pvt;
+
+	if ((pci = kzalloc(size, GFP_KERNEL)) == NULL)
+		return NULL;
+
+	pvt = sz_pvt ? ((char *)pci) + ((unsigned long)pvt) : NULL;
+
+	pci->pvt_info = pvt;
+
+	pci->op_state = OP_ALLOC;
+
+	snprintf(pci->name, strlen(edac_pci_name)+1, "%s", edac_pci_name);
+
+	return pci;
+}
+EXPORT_SYMBOL_GPL(edac_pci_alloc_ctl_info);
+
+/*
+ * edac_pci_free_ctl_info()
+ * 	frees the memory allocated by edac_pci_alloc_ctl_info() function
+ */
+void edac_pci_free_ctl_info(struct edac_pci_ctl_info *pci)
+{
+	kfree(pci);
+}
+EXPORT_SYMBOL_GPL(edac_pci_free_ctl_info);
+
+/*
+ * find_edac_pci_by_dev()
+ * 	scans the edac_pci list for a specific 'struct device *'
+ */
+static struct edac_pci_ctl_info * find_edac_pci_by_dev(struct device *dev)
+{
+	struct edac_pci_ctl_info *pci;
+	struct list_head *item;
+
+	debugf3("%s()\n", __func__);
+
+	list_for_each(item, &edac_pci_list) {
+		pci = list_entry(item, struct edac_pci_ctl_info, link);
+
+		if (pci->dev == dev)
+			return pci;
+	}
+
+	return NULL;
+}
+
+/*
+ * add_edac_pci_to_global_list
+ * 	Before calling this function, caller must assign a unique value to
+ * 	edac_dev->pci_idx.
+ * 	Return:
+ * 		0 on success
+ * 		1 on failure
+ */
+static int add_edac_pci_to_global_list(struct edac_pci_ctl_info *pci)
+{
+	struct list_head *item, *insert_before;
+	struct edac_pci_ctl_info *rover;
+
+	insert_before = &edac_pci_list;
+
+	/* Determine if already on the list */
+	if (unlikely((rover = find_edac_pci_by_dev(pci->dev)) != NULL))
+		goto fail0;
+
+	/* Insert in ascending order by 'pci_idx', so find position */
+	list_for_each(item, &edac_pci_list) {
+		rover = list_entry(item, struct edac_pci_ctl_info, link);
+
+		if (rover->pci_idx >= pci->pci_idx) {
+			if (unlikely(rover->pci_idx == pci->pci_idx))
+				goto fail1;
+
+			insert_before = item;
+			break;
+		}
+	}
+
+	list_add_tail_rcu(&pci->link, insert_before);
+	return 0;
+
+fail0:
+	edac_printk(KERN_WARNING, EDAC_PCI,
+		"%s (%s) %s %s already assigned %d\n",
+		rover->dev->bus_id, dev_name(rover),
+		rover->mod_name, rover->ctl_name, rover->pci_idx);
+	return 1;
+
+fail1:
+	edac_printk(KERN_WARNING, EDAC_PCI,
+		"but in low-level driver: attempt to assign\n"
+		"\tduplicate pci_idx %d in %s()\n", rover->pci_idx, __func__);
+	return 1;
+}
+
+/*
+ * complete_edac_pci_list_del
+ */
+static void complete_edac_pci_list_del(struct rcu_head *head)
+{
+	struct edac_pci_ctl_info *pci;
+
+	pci = container_of(head, struct edac_pci_ctl_info, rcu);
+	INIT_LIST_HEAD(&pci->link);
+	complete(&pci->complete);
+}
+
+/*
+ * del_edac_pci_from_global_list
+ */
+static void del_edac_pci_from_global_list(struct edac_pci_ctl_info *pci)
+{
+	list_del_rcu(&pci->link);
+	init_completion(&pci->complete);
+	call_rcu(&pci->rcu, complete_edac_pci_list_del);
+	wait_for_completion(&pci->complete);
+}
+
+/*
+ * edac_pci_find()
+ * 	Search for an edac_pci_ctl_info structure whose index is 'idx'
+ *
+ * If found, return a pointer to the structure
+ * Else return NULL.
+ *
+ * Caller must hold pci_ctls_mutex.
+ */
+struct edac_pci_ctl_info * edac_pci_find(int idx)
+{
+	struct list_head *item;
+	struct edac_pci_ctl_info *pci;
+
+	/* Iterage over list, looking for exact match of ID */
+	list_for_each(item, &edac_pci_list) {
+		pci = list_entry(item, struct edac_pci_ctl_info, link);
+
+		if (pci->pci_idx >= idx) {
+			if (pci->pci_idx == idx)
+				return pci;
+
+		/* not on list, so terminate early */
+			break;
+		}
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(edac_pci_find);
+
+/*
+ * edac_pci_workq_function()
+ * 	performs the operation scheduled by a workq request
+ */
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20))
+static void edac_pci_workq_function(struct work_struct *work_req)
+{
+	struct delayed_work *d_work = (struct delayed_work *)work_req;
+	struct edac_pci_ctl_info *pci = to_edac_pci_ctl_work(d_work);
+#else
+static void edac_pci_workq_function(void *ptr)
+{
+	struct edac_pci_ctl_info *pci = ptr;
+#endif
+
+	edac_lock_pci_list();
+
+	if ((pci->op_state == OP_RUNNING_POLL) &&
+		(pci->edac_check != NULL) &&
+		(pci->check_parity_error))
+		pci->edac_check(pci);
+
+	edac_unlock_pci_list();
+
+	/* Reschedule */
+	queue_delayed_work(edac_workqueue, &pci->work, pci->delay);
+}
+
+/*
+ * edac_pci_workq_setup()
+ * 	initialize a workq item for this edac_pci instance
+ * 	passing in the new delay period in msec
+ */
+static void edac_pci_workq_setup(struct edac_pci_ctl_info *pci,
+		unsigned int msec)
+{
+	debugf0("%s()\n", __func__);
+
+	pci->poll_msec = msec;
+	edac_calc_delay(pci);
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20))
+	INIT_DELAYED_WORK(&pci->work, edac_pci_workq_function);
+#else
+	INIT_WORK(&pci->work, edac_pci_workq_function, pci);
+#endif
+	queue_delayed_work(edac_workqueue, &pci->work, pci->delay);
+}
+
+/*
+ * edac_pci_workq_teardown()
+ * 	stop the workq processing on this edac_pci instance
+ */
+static void edac_pci_workq_teardown(struct edac_pci_ctl_info *pci)
+{
+	int status;
+
+	status = cancel_delayed_work(&pci->work);
+	if (status == 0)
+		flush_workqueue(edac_workqueue);
+}
+
+/*
+ * edac_pci_reset_delay_period
+ */
+void edac_pci_reset_delay_period(struct edac_pci_ctl_info *pci,
+		unsigned long value)
+{
+	edac_lock_pci_list();
+
+	edac_pci_workq_teardown(pci);
+
+	edac_pci_workq_setup(pci, value);
+
+	edac_unlock_pci_list();
+}
+EXPORT_SYMBOL_GPL(edac_pci_reset_delay_period);
+
+/*
+ * edac_pci_add_device: Insert the 'edac_dev' structure into the
+ * edac_pci global list and create sysfs entries associated with
+ * edac_pci structure.
+ * @pci: pointer to the edac_device structure to be added to the list
+ * @edac_idx: A unique numeric identifier to be assigned to the
+ * 'edac_pci' structure.
+ *
+ * Return:
+ *      0       Success
+ *      !0      Failure
+ */
+int edac_pci_add_device(struct edac_pci_ctl_info *pci, int edac_idx)
+{
+	debugf0("%s()\n", __func__);
+
+	pci->pci_idx = edac_idx;
+
+	edac_lock_pci_list();
+
+	if (add_edac_pci_to_global_list(pci))
+		goto fail0;
+
+	pci->start_time = jiffies;
+
+	if (edac_pci_create_sysfs(pci)) {
+		edac_pci_printk(pci, KERN_WARNING,
+				"failed to create sysfs pci\n");
+		goto fail1;
+	}
+
+	if (pci->edac_check != NULL) {
+		pci->op_state = OP_RUNNING_POLL;
+
+		edac_pci_workq_setup(pci, 1000);
+	} else {
+		pci->op_state = OP_RUNNING_INTERRUPT;
+	}
+
+	edac_pci_printk(pci, KERN_INFO,
+		"Giving out device to module '%s' controller '%s':"
+		" DEV '%s' (%s)\n",
+		pci->mod_name,
+		pci->ctl_name,
+		dev_name(pci),
+		edac_op_state_toString(pci->op_state));
+
+	edac_unlock_pci_list();
+	return 0;
+
+fail1:
+	del_edac_pci_from_global_list(pci);
+fail0:
+	edac_unlock_pci_list();
+	return 1;
+}
+EXPORT_SYMBOL_GPL(edac_pci_add_device);
+
+/*
+ * edac_pci_del_device()
+ * 	Remove sysfs entries for specified edac_pci structure and
+ * 	then remove edac_pci structure from global list
+ *
+ * @dev:
+ * 	Pointer to 'struct device' representing edac_pci structure
+ * 	to remove
+ *
+ * Return:
+ * 	Pointer to removed edac_pci structure,
+ * 	or NULL if device not found
+ */
+struct edac_pci_ctl_info * edac_pci_del_device(struct device *dev)
+{
+	struct edac_pci_ctl_info *pci;
+
+	debugf0("%s()\n", __func__);
+
+	edac_lock_pci_list();
+
+	if ((pci = find_edac_pci_by_dev(dev)) == NULL) {
+		edac_unlock_pci_list();
+		return NULL;
+	}
+
+	pci->op_state = OP_OFFLINE;
+
+	edac_pci_workq_teardown(pci);
+
+	edac_pci_remove_sysfs(pci);
+
+	del_edac_pci_from_global_list(pci);
+
+	edac_unlock_pci_list();
+
+	edac_printk(KERN_INFO, EDAC_PCI,
+		"Removed device %d for %s %s: DEV %s\n",
+		pci->pci_idx,
+		pci->mod_name,
+		pci->ctl_name,
+		dev_name(pci));
+
+	return pci;
+}
+EXPORT_SYMBOL_GPL(edac_pci_del_device);
+
+static inline int edac_pci_get_log_pe(struct edac_pci_ctl_info *pci)
+{
+	return pci->log_parity_error;
+}
+
+static inline int edac_pci_get_panic_on_pe(struct edac_pci_ctl_info *pci)
+{
+	return pci->panic_on_pe;
+}
+
+void edac_pci_generic_check(struct edac_pci_ctl_info *pci)
+{
+	edac_pci_do_parity_check();
+}
+
+static int edac_pci_idx = 0;
+#define EDAC_PCI_GENCTL_NAME	"EDAC PCI controller"
+
+struct edac_pci_gen_data {
+	int edac_idx;
+};
+
+struct edac_pci_ctl_info *
+edac_pci_create_generic_ctl(struct device *dev, const char *mod_name)
+{
+	struct edac_pci_ctl_info *pci;
+	struct edac_pci_gen_data *pdata;
+
+	pci = edac_pci_alloc_ctl_info(sizeof(*pdata), EDAC_PCI_GENCTL_NAME);
+	if (!pci)
+		return NULL;
+
+	pdata = pci->pvt_info;
+	pci->dev = dev;
+	dev_set_drvdata(pci->dev, pci);
+	pci->dev_name = pci_name(to_pci_dev(dev));
+
+	pci->mod_name = mod_name;
+	pci->ctl_name = EDAC_PCI_GENCTL_NAME;
+	pci->edac_check = edac_pci_generic_check;
+
+	pdata->edac_idx = edac_pci_idx++;
+
+	if (edac_pci_add_device(pci, pdata->edac_idx) > 0) {
+		debugf3("%s(): failed edac_pci_add_device()\n", __func__);
+		edac_pci_free_ctl_info(pci);
+		return NULL;
+	}
+
+	return pci;
+}
+EXPORT_SYMBOL_GPL(edac_pci_create_generic_ctl);
+
+void edac_pci_release_generic_ctl(struct edac_pci_ctl_info *pci)
+{
+	edac_pci_del_device(pci->dev);
+	edac_pci_free_ctl_info(pci);
+}
+EXPORT_SYMBOL_GPL(edac_pci_release_generic_ctl);