drivers/net/wireless/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
  28 static struct dentry *root_folder;
  29
  30 static 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
  48 static 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: idx=%d\n", ifp->bssidx);
  53
  54         return brcmf_debug_create_memdump(ifp->drvr->bus_if, data,
  55                                           evtmsg->datalen);
  56 }
  57
  58 void 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
  65 void brcmf_debugfs_exit(void)
  66 {
  67         if (!root_folder)
  68                 return;
  69
  70         debugfs_remove_recursive(root_folder);
  71         root_folder = NULL;
  72 }
  73
  74 int 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
  90 void 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
  98 struct dentry *brcmf_debugfs_get_devdir(struct brcmf_pub *drvr)
  99 {
 100         return drvr->dbgfs_dir;
 101 }
 102
 103 int 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 }