drivers/edac: split out functions to unique files

This is a large patch to refactor the original EDAC module in the kernel
and to break it up into better file granularity, such that each source
file contains a given subsystem of the EDAC CORE.

Originally, the EDAC 'core' was contained in one source file: edac_mc.c
with it corresponding edac_mc.h file.

Now, there are the following files:

edac_module.c	The main module init/exit function and other overhead
edac_mc.c	Code handling the edac_mc class of object
edac_mc_sysfs.c	Code handling for sysfs presentation
edac_pci_sysfs.c  Code handling for PCI sysfs presentation
edac_core.h	CORE .h include file for 'edac_mc' and 'edac_device' drivers
edac_module.h	Internal CORE .h include file

This forms a foundation upon which a later patch can create the 'edac_device'
class of object code in a new file 'edac_device.c'.

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, 130 insertions, 0 deletions

diff --git a/drivers/edac/edac_module.c b/drivers/edac/edac_module.c
new file mode 100644
index 000000000000..8db0471a9476
--- /dev/null
+++ b/drivers/edac/edac_module.c
@@ -0,0 +1,130 @@
+
+#include <linux/freezer.h>
+#include <linux/kthread.h>
+
+#include "edac_mc.h"
+#include "edac_module.h"
+
+#define EDAC_MC_VERSION "Ver: 2.0.3" __DATE__
+
+#ifdef CONFIG_EDAC_DEBUG
+/* Values of 0 to 4 will generate output */
+int edac_debug_level = 1;
+EXPORT_SYMBOL_GPL(edac_debug_level);
+#endif
+
+static struct task_struct *edac_thread;
+
+/*
+ * Check MC status every edac_get_poll_msec().
+ * Check PCI status every edac_get_poll_msec() as well.
+ *
+ * This where the work gets done for edac.
+ *
+ * SMP safe, doesn't use NMI, and auto-rate-limits.
+ */
+static void do_edac_check(void)
+{
+        debugf3("%s()\n", __func__);
+
+        /* perform the poll activities */
+        edac_check_mc_devices();
+        edac_pci_do_parity_check();
+}
+
+/*
+ * Action thread for EDAC to perform the POLL operations
+ */
+static int edac_kernel_thread(void *arg)
+{
+        int msec;
+
+        while (!kthread_should_stop()) {
+
+                do_edac_check();
+
+                /* goto sleep for the interval */
+                msec = (HZ * edac_get_poll_msec()) / 1000;
+                schedule_timeout_interruptible(msec);
+                try_to_freeze();
+        }
+
+        return 0;
+}
+
+/*
+ * edac_init
+ *      module initialization entry point
+ */
+static int __init edac_init(void)
+{
+        edac_printk(KERN_INFO, EDAC_MC, EDAC_MC_VERSION "\n");
+
+        /*
+         * Harvest and clear any boot/initialization PCI parity errors
+         *
+         * FIXME: This only clears errors logged by devices present at time of
+         *      module initialization.  We should also do an initial clear
+         *      of each newly hotplugged device.
+         */
+        edac_pci_clear_parity_errors();
+
+        /* Create the MC sysfs entries */
+        if (edac_sysfs_memctrl_setup()) {
+                edac_printk(KERN_ERR, EDAC_MC,
+                        "Error initializing sysfs code\n");
+                return -ENODEV;
+        }
+
+        /* Create the PCI parity sysfs entries */
+        if (edac_sysfs_pci_setup()) {
+                edac_sysfs_memctrl_teardown();
+                edac_printk(KERN_ERR, EDAC_MC,
+                        "PCI: Error initializing sysfs code\n");
+                return -ENODEV;
+        }
+
+        /* create our kernel thread */
+        edac_thread = kthread_run(edac_kernel_thread, NULL, "kedac");
+
+        if (IS_ERR(edac_thread)) {
+                /* remove the sysfs entries */
+                edac_sysfs_memctrl_teardown();
+                edac_sysfs_pci_teardown();
+                return PTR_ERR(edac_thread);
+        }
+
+        return 0;
+}
+
+/*
+ * edac_exit()
+ *      module exit/termination function
+ */
+static void __exit edac_exit(void)
+{
+        debugf0("%s()\n", __func__);
+        kthread_stop(edac_thread);
+
+        /* tear down the sysfs device */
+        edac_sysfs_memctrl_teardown();
+        edac_sysfs_pci_teardown();
+}
+
+/*
+ * Inform the kernel of our entry and exit points
+ */
+module_init(edac_init);
+module_exit(edac_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
+MODULE_DESCRIPTION("Core library routines for EDAC reporting");
+
+/* refer to *_sysfs.c files for parameters that are exported via sysfs */
+
+#ifdef CONFIG_EDAC_DEBUG
+module_param(edac_debug_level, int, 0644);
+MODULE_PARM_DESC(edac_debug_level, "Debug level");
+#endif
+