1 files changed, 337 insertions, 0 deletions
diff --git a/drivers/edac/edac_pci.c b/drivers/edac/edac_pci.c
new file mode 100644
index 000000000..64c142aec
--- /dev/null
+++ b/drivers/edac/edac_pci.c
@@ -0,0 +1,337 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * EDAC PCI component
+ *
+ * Author: Dave Jiang <djiang@mvista.com>
+ *
+ * 2007 (c) MontaVista Software, Inc.
+ */
+#include <asm/page.h>
+#include <linux/uaccess.h>
+#include <linux/ctype.h>
+#include <linux/highmem.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/sysctl.h>
+#include <linux/timer.h>
+
+#include "edac_pci.h"
+#include "edac_module.h"
+
+static DEFINE_MUTEX(edac_pci_ctls_mutex);
+static LIST_HEAD(edac_pci_list);
+static atomic_t pci_indexes = ATOMIC_INIT(0);
+
+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;
+
+	edac_dbg(1, "\n");
+
+	pci = kzalloc(sizeof(struct edac_pci_ctl_info), GFP_KERNEL);
+	if (!pci)
+		return NULL;
+
+	if (sz_pvt) {
+		pci->pvt_info = kzalloc(sz_pvt, GFP_KERNEL);
+		if (!pci->pvt_info)
+			goto free;
+	}
+
+	pci->op_state = OP_ALLOC;
+
+	snprintf(pci->name, strlen(edac_pci_name) + 1, "%s", edac_pci_name);
+
+	return pci;
+
+free:
+	kfree(pci);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(edac_pci_alloc_ctl_info);
+
+void edac_pci_free_ctl_info(struct edac_pci_ctl_info *pci)
+{
+	edac_dbg(1, "\n");
+
+	edac_pci_remove_sysfs(pci);
+}
+EXPORT_SYMBOL_GPL(edac_pci_free_ctl_info);
+
+/*
+ * find_edac_pci_by_dev()
+ * 	scans the edac_pci list for a specific 'struct device *'
+ *
+ *	return NULL if not found, or return control struct pointer
+ */
+static struct edac_pci_ctl_info *find_edac_pci_by_dev(struct device *dev)
+{
+	struct edac_pci_ctl_info *pci;
+	struct list_head *item;
+
+	edac_dbg(1, "\n");
+
+	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;
+
+	edac_dbg(1, "\n");
+
+	insert_before = &edac_pci_list;
+
+	/* Determine if already on the list */
+	rover = find_edac_pci_by_dev(pci->dev);
+	if (unlikely(rover != 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",
+		dev_name(rover->dev), edac_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;
+}
+
+/*
+ * del_edac_pci_from_global_list
+ *
+ *	remove the PCI control struct from the global list
+ */
+static void del_edac_pci_from_global_list(struct edac_pci_ctl_info *pci)
+{
+	list_del_rcu(&pci->link);
+
+	/* these are for safe removal of devices from global list while
+	 * NMI handlers may be traversing list
+	 */
+	synchronize_rcu();
+	INIT_LIST_HEAD(&pci->link);
+}
+
+/*
+ * edac_pci_workq_function()
+ *
+ * 	periodic function that performs the operation
+ *	scheduled by a workq request, for a given PCI control struct
+ */
+static void edac_pci_workq_function(struct work_struct *work_req)
+{
+	struct delayed_work *d_work = to_delayed_work(work_req);
+	struct edac_pci_ctl_info *pci = to_edac_pci_ctl_work(d_work);
+	int msec;
+	unsigned long delay;
+
+	edac_dbg(3, "checking\n");
+
+	mutex_lock(&edac_pci_ctls_mutex);
+
+	if (pci->op_state != OP_RUNNING_POLL) {
+		mutex_unlock(&edac_pci_ctls_mutex);
+		return;
+	}
+
+	if (edac_pci_get_check_errors())
+		pci->edac_check(pci);
+
+	/* if we are on a one second period, then use round */
+	msec = edac_pci_get_poll_msec();
+	if (msec == 1000)
+		delay = round_jiffies_relative(msecs_to_jiffies(msec));
+	else
+		delay = msecs_to_jiffies(msec);
+
+	edac_queue_work(&pci->work, delay);
+
+	mutex_unlock(&edac_pci_ctls_mutex);
+}
+
+int edac_pci_alloc_index(void)
+{
+	return atomic_inc_return(&pci_indexes) - 1;
+}
+EXPORT_SYMBOL_GPL(edac_pci_alloc_index);
+
+int edac_pci_add_device(struct edac_pci_ctl_info *pci, int edac_idx)
+{
+	edac_dbg(0, "\n");
+
+	pci->pci_idx = edac_idx;
+	pci->start_time = jiffies;
+
+	mutex_lock(&edac_pci_ctls_mutex);
+
+	if (add_edac_pci_to_global_list(pci))
+		goto fail0;
+
+	if (edac_pci_create_sysfs(pci)) {
+		edac_pci_printk(pci, KERN_WARNING,
+				"failed to create sysfs pci\n");
+		goto fail1;
+	}
+
+	if (pci->edac_check) {
+		pci->op_state = OP_RUNNING_POLL;
+
+		INIT_DELAYED_WORK(&pci->work, edac_pci_workq_function);
+		edac_queue_work(&pci->work, msecs_to_jiffies(edac_pci_get_poll_msec()));
+
+	} 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, pci->dev_name,
+		edac_op_state_to_string(pci->op_state));
+
+	mutex_unlock(&edac_pci_ctls_mutex);
+	return 0;
+
+	/* error unwind stack */
+fail1:
+	del_edac_pci_from_global_list(pci);
+fail0:
+	mutex_unlock(&edac_pci_ctls_mutex);
+	return 1;
+}
+EXPORT_SYMBOL_GPL(edac_pci_add_device);
+
+struct edac_pci_ctl_info *edac_pci_del_device(struct device *dev)
+{
+	struct edac_pci_ctl_info *pci;
+
+	edac_dbg(0, "\n");
+
+	mutex_lock(&edac_pci_ctls_mutex);
+
+	/* ensure the control struct is on the global list
+	 * if not, then leave
+	 */
+	pci = find_edac_pci_by_dev(dev);
+	if (pci  == NULL) {
+		mutex_unlock(&edac_pci_ctls_mutex);
+		return NULL;
+	}
+
+	pci->op_state = OP_OFFLINE;
+
+	del_edac_pci_from_global_list(pci);
+
+	mutex_unlock(&edac_pci_ctls_mutex);
+
+	if (pci->edac_check)
+		edac_stop_work(&pci->work);
+
+	edac_printk(KERN_INFO, EDAC_PCI,
+		"Removed device %d for %s %s: DEV %s\n",
+		pci->pci_idx, pci->mod_name, pci->ctl_name, edac_dev_name(pci));
+
+	return pci;
+}
+EXPORT_SYMBOL_GPL(edac_pci_del_device);
+
+/*
+ * edac_pci_generic_check
+ *
+ *	a Generic parity check API
+ */
+static void edac_pci_generic_check(struct edac_pci_ctl_info *pci)
+{
+	edac_dbg(4, "\n");
+	edac_pci_do_parity_check();
+}
+
+/* free running instance index counter */
+static int edac_pci_idx;
+#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;
+	if (edac_op_state == EDAC_OPSTATE_POLL)
+		pci->edac_check = edac_pci_generic_check;
+
+	pdata->edac_idx = edac_pci_idx++;
+
+	if (edac_pci_add_device(pci, pdata->edac_idx) > 0) {
+		edac_dbg(3, "failed edac_pci_add_device()\n");
+		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_dbg(0, "pci mod=%s\n", pci->mod_name);
+
+	edac_pci_del_device(pci->dev);
+	edac_pci_free_ctl_info(pci);
+}
+EXPORT_SYMBOL_GPL(edac_pci_release_generic_ctl);