LXR linux/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c

   1/*
   2 * Copyright (c) 2012 Broadcom Corporation
   3 *
   4 * Permission to use, copy, modify, and/or distribute this software for any
   5 * purpose with or without fee is hereby granted, provided that the above
   6 * copyright notice and this permission notice appear in all copies.
   7 *
   8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  11 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  13 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15 */
  16#include <linux/debugfs.h>
  17#include <linux/netdevice.h>
  18#include <linux/module.h>
  19#include <linux/devcoredump.h>
  20
  21#include <brcmu_wifi.h>
  22#include <brcmu_utils.h>
  23#include "core.h"
  24#include "bus.h"
  25#include "fweh.h"
  26#include "debug.h"
  27
  28static struct dentry *root_folder;
  29
  30static int brcmf_debug_create_memdump(struct brcmf_bus *bus, const void *data,
  31                                      size_t len)
  32{
  33        void *dump;
  34        size_t ramsize;
  35
  36        ramsize = brcmf_bus_get_ramsize(bus);
  37        if (ramsize) {
  38                dump = vzalloc(len + ramsize);
  39                if (!dump)
  40                        return -ENOMEM;
  41                memcpy(dump, data, len);
  42                brcmf_bus_get_memdump(bus, dump + len, ramsize);
  43                dev_coredumpv(bus->dev, dump, len + ramsize, GFP_KERNEL);
  44        }
  45        return 0;
  46}
  47
  48static int brcmf_debug_psm_watchdog_notify(struct brcmf_if *ifp,
  49                                           const struct brcmf_event_msg *evtmsg,
  50                                           void *data)
  51{
  52        brcmf_dbg(TRACE, "enter: bsscfgidx=%d\n", ifp->bsscfgidx);
  53
  54        return brcmf_debug_create_memdump(ifp->drvr->bus_if, data,
  55                                          evtmsg->datalen);
  56}
  57
  58void brcmf_debugfs_init(void)
  59{
  60        root_folder = debugfs_create_dir(KBUILD_MODNAME, NULL);
  61        if (IS_ERR(root_folder))
  62                root_folder = NULL;
  63}
  64
  65void brcmf_debugfs_exit(void)
  66{
  67        if (!root_folder)
  68                return;
  69
  70        debugfs_remove_recursive(root_folder);
  71        root_folder = NULL;
  72}
  73
  74int brcmf_debug_attach(struct brcmf_pub *drvr)
  75{
  76        struct device *dev = drvr->bus_if->dev;
  77
  78        if (!root_folder)
  79                return -ENODEV;
  80
  81        drvr->dbgfs_dir = debugfs_create_dir(dev_name(dev), root_folder);
  82        if (IS_ERR(drvr->dbgfs_dir))
  83                return PTR_ERR(drvr->dbgfs_dir);
  84
  85
  86        return brcmf_fweh_register(drvr, BRCMF_E_PSM_WATCHDOG,
  87                                   brcmf_debug_psm_watchdog_notify);
  88}
  89
  90void brcmf_debug_detach(struct brcmf_pub *drvr)
  91{
  92        brcmf_fweh_unregister(drvr, BRCMF_E_PSM_WATCHDOG);
  93
  94        if (!IS_ERR_OR_NULL(drvr->dbgfs_dir))
  95                debugfs_remove_recursive(drvr->dbgfs_dir);
  96}
  97
  98struct dentry *brcmf_debugfs_get_devdir(struct brcmf_pub *drvr)
  99{
 100        return drvr->dbgfs_dir;
 101}
 102
 103int brcmf_debugfs_add_entry(struct brcmf_pub *drvr, const char *fn,
 104                            int (*read_fn)(struct seq_file *seq, void *data))
 105{
 106        struct dentry *e;
 107
 108        e = debugfs_create_devm_seqfile(drvr->bus_if->dev, fn,
 109                                        drvr->dbgfs_dir, read_fn);
 110        return PTR_ERR_OR_ZERO(e);
 111}
 112