debugfs.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2
  3#include <linux/string_choices.h>
  4
  5#include "edac_module.h"
  6
  7static struct dentry *edac_debugfs;
  8
  9static ssize_t edac_fake_inject_write(struct file *file,
 10				      const char __user *data,
 11				      size_t count, loff_t *ppos)
 12{
 13	struct device *dev = file->private_data;
 14	struct mem_ctl_info *mci = to_mci(dev);
 15	static enum hw_event_mc_err_type type;
 16	u16 errcount = mci->fake_inject_count;
 17
 18	if (!errcount)
 19		errcount = 1;
 20
 21	type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 22				   : HW_EVENT_ERR_CORRECTED;
 23
 24	printk(KERN_DEBUG
 25	       "Generating %d %s fake error%s to %d.%d.%d to test core handling. NOTE: this won't test the driver-specific decoding logic.\n",
 26		errcount,
 27		(type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 28		str_plural(errcount),
 29		mci->fake_inject_layer[0],
 30		mci->fake_inject_layer[1],
 31		mci->fake_inject_layer[2]
 32	       );
 33	edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
 34			     mci->fake_inject_layer[0],
 35			     mci->fake_inject_layer[1],
 36			     mci->fake_inject_layer[2],
 37			     "FAKE ERROR", "for EDAC testing only");
 38
 39	return count;
 40}
 41
 42static const struct file_operations debug_fake_inject_fops = {
 43	.open = simple_open,
 44	.write = edac_fake_inject_write,
 45	.llseek = generic_file_llseek,
 46};
 47
 48void __init edac_debugfs_init(void)
 49{
 50	edac_debugfs = debugfs_create_dir("edac", NULL);
 51}
 52
 53void edac_debugfs_exit(void)
 54{
 55	debugfs_remove_recursive(edac_debugfs);
 56}
 57
 58void edac_create_debugfs_nodes(struct mem_ctl_info *mci)
 59{
 60	struct dentry *parent;
 61	char name[80];
 62	int i;
 63
 64	parent = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
 65
 66	for (i = 0; i < mci->n_layers; i++) {
 67		sprintf(name, "fake_inject_%s",
 68			     edac_layer_name[mci->layers[i].type]);
 69		debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 70				  &mci->fake_inject_layer[i]);
 71	}
 72
 73	debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 74			    &mci->fake_inject_ue);
 75
 76	debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
 77			   &mci->fake_inject_count);
 78
 79	debugfs_create_file("fake_inject", S_IWUSR, parent, &mci->dev,
 80			    &debug_fake_inject_fops);
 81
 82	mci->debugfs = parent;
 83}
 84
 85/* Create a toplevel dir under EDAC's debugfs hierarchy */
 86struct dentry *edac_debugfs_create_dir(const char *dirname)
 87{
 88	if (!edac_debugfs)
 89		return NULL;
 90
 91	return debugfs_create_dir(dirname, edac_debugfs);
 92}
 93EXPORT_SYMBOL_GPL(edac_debugfs_create_dir);
 94
 95/* Create a toplevel dir under EDAC's debugfs hierarchy with parent @parent */
 96struct dentry *
 97edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent)
 98{
 99	return debugfs_create_dir(dirname, parent);
100}
101EXPORT_SYMBOL_GPL(edac_debugfs_create_dir_at);
102
103/*
104 * Create a file under EDAC's hierarchy or a sub-hierarchy:
105 *
106 * @name: file name
107 * @mode: file permissions
108 * @parent: parent dentry. If NULL, it becomes the toplevel EDAC dir
109 * @data: private data of caller
110 * @fops: file operations of this file
111 */
112struct dentry *
113edac_debugfs_create_file(const char *name, umode_t mode, struct dentry *parent,
114			 void *data, const struct file_operations *fops)
115{
116	if (!parent)
117		parent = edac_debugfs;
118
119	return debugfs_create_file(name, mode, parent, data, fops);
120}
121EXPORT_SYMBOL_GPL(edac_debugfs_create_file);
122
123/* Wrapper for debugfs_create_x8() */
124void edac_debugfs_create_x8(const char *name, umode_t mode,
125			    struct dentry *parent, u8 *value)
126{
127	if (!parent)
128		parent = edac_debugfs;
129
130	debugfs_create_x8(name, mode, parent, value);
131}
132EXPORT_SYMBOL_GPL(edac_debugfs_create_x8);
133
134/* Wrapper for debugfs_create_x16() */
135void edac_debugfs_create_x16(const char *name, umode_t mode,
136			     struct dentry *parent, u16 *value)
137{
138	if (!parent)
139		parent = edac_debugfs;
140
141	debugfs_create_x16(name, mode, parent, value);
142}
143EXPORT_SYMBOL_GPL(edac_debugfs_create_x16);
144
145/* Wrapper for debugfs_create_x32() */
146void edac_debugfs_create_x32(const char *name, umode_t mode,
147			     struct dentry *parent, u32 *value)
148{
149	if (!parent)
150		parent = edac_debugfs;
151
152	debugfs_create_x32(name, mode, parent, value);
153}
154EXPORT_SYMBOL_GPL(edac_debugfs_create_x32);