cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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edac_module.c (3368B)

      1/*
      2 * edac_module.c
      3 *
      4 * (C) 2007 www.softwarebitmaker.com
      5 *
      6 * This file is licensed under the terms of the GNU General Public
      7 * License version 2. This program is licensed "as is" without any
      8 * warranty of any kind, whether express or implied.
      9 *
     10 * Author: Doug Thompson <dougthompson@xmission.com>
     11 *
     12 */
     13#include <linux/edac.h>
     14
     15#include "edac_mc.h"
     16#include "edac_module.h"
     17
     18#define EDAC_VERSION "Ver: 3.0.0"
     19
     20#ifdef CONFIG_EDAC_DEBUG
     21
     22static int edac_set_debug_level(const char *buf,
     23				const struct kernel_param *kp)
     24{
     25	unsigned long val;
     26	int ret;
     27
     28	ret = kstrtoul(buf, 0, &val);
     29	if (ret)
     30		return ret;
     31
     32	if (val > 4)
     33		return -EINVAL;
     34
     35	return param_set_int(buf, kp);
     36}
     37
     38/* Values of 0 to 4 will generate output */
     39int edac_debug_level = 2;
     40EXPORT_SYMBOL_GPL(edac_debug_level);
     41
     42module_param_call(edac_debug_level, edac_set_debug_level, param_get_int,
     43		  &edac_debug_level, 0644);
     44MODULE_PARM_DESC(edac_debug_level, "EDAC debug level: [0-4], default: 2");
     45#endif
     46
     47/*
     48 * edac_op_state_to_string()
     49 */
     50char *edac_op_state_to_string(int opstate)
     51{
     52	if (opstate == OP_RUNNING_POLL)
     53		return "POLLED";
     54	else if (opstate == OP_RUNNING_INTERRUPT)
     55		return "INTERRUPT";
     56	else if (opstate == OP_RUNNING_POLL_INTR)
     57		return "POLL-INTR";
     58	else if (opstate == OP_ALLOC)
     59		return "ALLOC";
     60	else if (opstate == OP_OFFLINE)
     61		return "OFFLINE";
     62
     63	return "UNKNOWN";
     64}
     65
     66/*
     67 * sysfs object: /sys/devices/system/edac
     68 *	need to export to other files
     69 */
     70static struct bus_type edac_subsys = {
     71	.name = "edac",
     72	.dev_name = "edac",
     73};
     74
     75static int edac_subsys_init(void)
     76{
     77	int err;
     78
     79	/* create the /sys/devices/system/edac directory */
     80	err = subsys_system_register(&edac_subsys, NULL);
     81	if (err)
     82		printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
     83
     84	return err;
     85}
     86
     87static void edac_subsys_exit(void)
     88{
     89	bus_unregister(&edac_subsys);
     90}
     91
     92/* return pointer to the 'edac' node in sysfs */
     93struct bus_type *edac_get_sysfs_subsys(void)
     94{
     95	return &edac_subsys;
     96}
     97EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
     98/*
     99 * edac_init
    100 *      module initialization entry point
    101 */
    102static int __init edac_init(void)
    103{
    104	int err = 0;
    105
    106	edac_printk(KERN_INFO, EDAC_MC, EDAC_VERSION "\n");
    107
    108	err = edac_subsys_init();
    109	if (err)
    110		return err;
    111
    112	/*
    113	 * Harvest and clear any boot/initialization PCI parity errors
    114	 *
    115	 * FIXME: This only clears errors logged by devices present at time of
    116	 *      module initialization.  We should also do an initial clear
    117	 *      of each newly hotplugged device.
    118	 */
    119	edac_pci_clear_parity_errors();
    120
    121	err = edac_mc_sysfs_init();
    122	if (err)
    123		goto err_sysfs;
    124
    125	edac_debugfs_init();
    126
    127	err = edac_workqueue_setup();
    128	if (err) {
    129		edac_printk(KERN_ERR, EDAC_MC, "Failure initializing workqueue\n");
    130		goto err_wq;
    131	}
    132
    133	return 0;
    134
    135err_wq:
    136	edac_debugfs_exit();
    137	edac_mc_sysfs_exit();
    138
    139err_sysfs:
    140	edac_subsys_exit();
    141
    142	return err;
    143}
    144
    145/*
    146 * edac_exit()
    147 *      module exit/termination function
    148 */
    149static void __exit edac_exit(void)
    150{
    151	edac_dbg(0, "\n");
    152
    153	/* tear down the various subsystems */
    154	edac_workqueue_teardown();
    155	edac_mc_sysfs_exit();
    156	edac_debugfs_exit();
    157	edac_subsys_exit();
    158}
    159
    160/*
    161 * Inform the kernel of our entry and exit points
    162 */
    163subsys_initcall(edac_init);
    164module_exit(edac_exit);
    165
    166MODULE_LICENSE("GPL");
    167MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
    168MODULE_DESCRIPTION("Core library routines for EDAC reporting");