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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hsr_debugfs.c (3910B)

      1/*
      2 * debugfs code for HSR & PRP
      3 * Copyright (C) 2019 Texas Instruments Incorporated
      4 *
      5 * Author(s):
      6 *	Murali Karicheri <m-karicheri2@ti.com>
      7 *
      8 * This program is free software; you can redistribute it and/or
      9 * modify it under the terms of the GNU General Public License as
     10 * published by the Free Software Foundation version 2.
     11 *
     12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
     13 * kind, whether express or implied; without even the implied warranty
     14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15 * GNU General Public License for more details.
     16 */
     17#include <linux/module.h>
     18#include <linux/errno.h>
     19#include <linux/debugfs.h>
     20#include <linux/jhash.h>
     21#include "hsr_main.h"
     22#include "hsr_framereg.h"
     23
     24static struct dentry *hsr_debugfs_root_dir;
     25
     26/* hsr_node_table_show - Formats and prints node_table entries */
     27static int
     28hsr_node_table_show(struct seq_file *sfp, void *data)
     29{
     30	struct hsr_priv *priv = (struct hsr_priv *)sfp->private;
     31	struct hsr_node *node;
     32	int i;
     33
     34	seq_printf(sfp, "Node Table entries for (%s) device\n",
     35		   (priv->prot_version == PRP_V1 ? "PRP" : "HSR"));
     36	seq_puts(sfp, "MAC-Address-A,    MAC-Address-B,    time_in[A], ");
     37	seq_puts(sfp, "time_in[B], Address-B port, ");
     38	if (priv->prot_version == PRP_V1)
     39		seq_puts(sfp, "SAN-A, SAN-B, DAN-P\n");
     40	else
     41		seq_puts(sfp, "DAN-H\n");
     42
     43	rcu_read_lock();
     44
     45	for (i = 0 ; i < priv->hash_buckets; i++) {
     46		hlist_for_each_entry_rcu(node, &priv->node_db[i], mac_list) {
     47			/* skip self node */
     48			if (hsr_addr_is_self(priv, node->macaddress_A))
     49				continue;
     50			seq_printf(sfp, "%pM ", &node->macaddress_A[0]);
     51			seq_printf(sfp, "%pM ", &node->macaddress_B[0]);
     52			seq_printf(sfp, "%10lx, ",
     53				   node->time_in[HSR_PT_SLAVE_A]);
     54			seq_printf(sfp, "%10lx, ",
     55				   node->time_in[HSR_PT_SLAVE_B]);
     56			seq_printf(sfp, "%14x, ", node->addr_B_port);
     57
     58			if (priv->prot_version == PRP_V1)
     59				seq_printf(sfp, "%5x, %5x, %5x\n",
     60					   node->san_a, node->san_b,
     61					   (node->san_a == 0 &&
     62					    node->san_b == 0));
     63			else
     64				seq_printf(sfp, "%5x\n", 1);
     65		}
     66	}
     67	rcu_read_unlock();
     68	return 0;
     69}
     70
     71DEFINE_SHOW_ATTRIBUTE(hsr_node_table);
     72
     73void hsr_debugfs_rename(struct net_device *dev)
     74{
     75	struct hsr_priv *priv = netdev_priv(dev);
     76	struct dentry *d;
     77
     78	d = debugfs_rename(hsr_debugfs_root_dir, priv->node_tbl_root,
     79			   hsr_debugfs_root_dir, dev->name);
     80	if (IS_ERR(d))
     81		netdev_warn(dev, "failed to rename\n");
     82	else
     83		priv->node_tbl_root = d;
     84}
     85
     86/* hsr_debugfs_init - create hsr node_table file for dumping
     87 * the node table
     88 *
     89 * Description:
     90 * When debugfs is configured this routine sets up the node_table file per
     91 * hsr device for dumping the node_table entries
     92 */
     93void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev)
     94{
     95	struct dentry *de = NULL;
     96
     97	de = debugfs_create_dir(hsr_dev->name, hsr_debugfs_root_dir);
     98	if (IS_ERR(de)) {
     99		pr_err("Cannot create hsr debugfs directory\n");
    100		return;
    101	}
    102
    103	priv->node_tbl_root = de;
    104
    105	de = debugfs_create_file("node_table", S_IFREG | 0444,
    106				 priv->node_tbl_root, priv,
    107				 &hsr_node_table_fops);
    108	if (IS_ERR(de)) {
    109		pr_err("Cannot create hsr node_table file\n");
    110		debugfs_remove(priv->node_tbl_root);
    111		priv->node_tbl_root = NULL;
    112		return;
    113	}
    114}
    115
    116/* hsr_debugfs_term - Tear down debugfs intrastructure
    117 *
    118 * Description:
    119 * When Debugfs is configured this routine removes debugfs file system
    120 * elements that are specific to hsr
    121 */
    122void
    123hsr_debugfs_term(struct hsr_priv *priv)
    124{
    125	debugfs_remove_recursive(priv->node_tbl_root);
    126	priv->node_tbl_root = NULL;
    127}
    128
    129void hsr_debugfs_create_root(void)
    130{
    131	hsr_debugfs_root_dir = debugfs_create_dir("hsr", NULL);
    132	if (IS_ERR(hsr_debugfs_root_dir)) {
    133		pr_err("Cannot create hsr debugfs root directory\n");
    134		hsr_debugfs_root_dir = NULL;
    135	}
    136}
    137
    138void hsr_debugfs_remove_root(void)
    139{
    140	/* debugfs_remove() internally checks NULL and ERROR */
    141	debugfs_remove(hsr_debugfs_root_dir);
    142}