cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

objcnt.c (2897B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/* SCTP kernel implementation
      3 * (C) Copyright IBM Corp. 2001, 2004
      4 *
      5 * This file is part of the SCTP kernel implementation
      6 *
      7 * Support for memory object debugging.  This allows one to monitor the
      8 * object allocations/deallocations for types instrumented for this
      9 * via the proc fs.
     10 *
     11 * Please send any bug reports or fixes you make to the
     12 * email address(es):
     13 *    lksctp developers <linux-sctp@vger.kernel.org>
     14 *
     15 * Written or modified by:
     16 *    Jon Grimm             <jgrimm@us.ibm.com>
     17 */
     18
     19#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
     20
     21#include <linux/kernel.h>
     22#include <net/sctp/sctp.h>
     23
     24/*
     25 * Global counters to count raw object allocation counts.
     26 * To add new counters, choose a unique suffix for the variable
     27 * name as the helper macros key off this suffix to make
     28 * life easier for the programmer.
     29 */
     30
     31SCTP_DBG_OBJCNT(sock);
     32SCTP_DBG_OBJCNT(ep);
     33SCTP_DBG_OBJCNT(transport);
     34SCTP_DBG_OBJCNT(assoc);
     35SCTP_DBG_OBJCNT(bind_addr);
     36SCTP_DBG_OBJCNT(bind_bucket);
     37SCTP_DBG_OBJCNT(chunk);
     38SCTP_DBG_OBJCNT(addr);
     39SCTP_DBG_OBJCNT(datamsg);
     40SCTP_DBG_OBJCNT(keys);
     41
     42/* An array to make it easy to pretty print the debug information
     43 * to the proc fs.
     44 */
     45static struct sctp_dbg_objcnt_entry sctp_dbg_objcnt[] = {
     46	SCTP_DBG_OBJCNT_ENTRY(sock),
     47	SCTP_DBG_OBJCNT_ENTRY(ep),
     48	SCTP_DBG_OBJCNT_ENTRY(assoc),
     49	SCTP_DBG_OBJCNT_ENTRY(transport),
     50	SCTP_DBG_OBJCNT_ENTRY(chunk),
     51	SCTP_DBG_OBJCNT_ENTRY(bind_addr),
     52	SCTP_DBG_OBJCNT_ENTRY(bind_bucket),
     53	SCTP_DBG_OBJCNT_ENTRY(addr),
     54	SCTP_DBG_OBJCNT_ENTRY(datamsg),
     55	SCTP_DBG_OBJCNT_ENTRY(keys),
     56};
     57
     58/* Callback from procfs to read out objcount information.
     59 * Walk through the entries in the sctp_dbg_objcnt array, dumping
     60 * the raw object counts for each monitored type.
     61 */
     62static int sctp_objcnt_seq_show(struct seq_file *seq, void *v)
     63{
     64	int i;
     65
     66	i = (int)*(loff_t *)v;
     67	seq_setwidth(seq, 127);
     68	seq_printf(seq, "%s: %d", sctp_dbg_objcnt[i].label,
     69				atomic_read(sctp_dbg_objcnt[i].counter));
     70	seq_pad(seq, '\n');
     71	return 0;
     72}
     73
     74static void *sctp_objcnt_seq_start(struct seq_file *seq, loff_t *pos)
     75{
     76	return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
     77}
     78
     79static void sctp_objcnt_seq_stop(struct seq_file *seq, void *v)
     80{
     81}
     82
     83static void *sctp_objcnt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
     84{
     85	++*pos;
     86	return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
     87}
     88
     89static const struct seq_operations sctp_objcnt_seq_ops = {
     90	.start = sctp_objcnt_seq_start,
     91	.next  = sctp_objcnt_seq_next,
     92	.stop  = sctp_objcnt_seq_stop,
     93	.show  = sctp_objcnt_seq_show,
     94};
     95
     96/* Initialize the objcount in the proc filesystem.  */
     97void sctp_dbg_objcnt_init(struct net *net)
     98{
     99	struct proc_dir_entry *ent;
    100
    101	ent = proc_create_seq("sctp_dbg_objcnt", 0,
    102			  net->sctp.proc_net_sctp, &sctp_objcnt_seq_ops);
    103	if (!ent)
    104		pr_warn("sctp_dbg_objcnt: Unable to create /proc entry.\n");
    105}