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: bsscfgidx=%d\n", ifp->bsscfgidx); 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 } 112