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 int err; 36 37 ramsize = brcmf_bus_get_ramsize(bus); 38 if (!ramsize) 39 return -ENOTSUPP; 40 41 dump = vzalloc(len + ramsize); 42 if (!dump) 43 return -ENOMEM; 44 45 memcpy(dump, data, len); 46 err = brcmf_bus_get_memdump(bus, dump + len, ramsize); 47 if (err) { 48 vfree(dump); 49 return err; 50 } 51 52 dev_coredumpv(bus->dev, dump, len + ramsize, GFP_KERNEL); 53 54 return 0; 55 } 56 57 static int brcmf_debug_psm_watchdog_notify(struct brcmf_if *ifp, 58 const struct brcmf_event_msg *evtmsg, 59 void *data) 60 { 61 int err; 62 63 brcmf_dbg(TRACE, "enter: bsscfgidx=%d\n", ifp->bsscfgidx); 64 65 brcmf_err("PSM's watchdog has fired!\n"); 66 67 err = brcmf_debug_create_memdump(ifp->drvr->bus_if, data, 68 evtmsg->datalen); 69 if (err) 70 brcmf_err("Failed to get memory dump, %d\n", err); 71 72 return err; 73 } 74 75 void brcmf_debugfs_init(void) 76 { 77 root_folder = debugfs_create_dir(KBUILD_MODNAME, NULL); 78 if (IS_ERR(root_folder)) 79 root_folder = NULL; 80 } 81 82 void brcmf_debugfs_exit(void) 83 { 84 if (!root_folder) 85 return; 86 87 debugfs_remove_recursive(root_folder); 88 root_folder = NULL; 89 } 90 91 int brcmf_debug_attach(struct brcmf_pub *drvr) 92 { 93 struct device *dev = drvr->bus_if->dev; 94 95 if (!root_folder) 96 return -ENODEV; 97 98 drvr->dbgfs_dir = debugfs_create_dir(dev_name(dev), root_folder); 99 if (IS_ERR(drvr->dbgfs_dir)) 100 return PTR_ERR(drvr->dbgfs_dir); 101 102 103 return brcmf_fweh_register(drvr, BRCMF_E_PSM_WATCHDOG, 104 brcmf_debug_psm_watchdog_notify); 105 } 106 107 void brcmf_debug_detach(struct brcmf_pub *drvr) 108 { 109 brcmf_fweh_unregister(drvr, BRCMF_E_PSM_WATCHDOG); 110 111 if (!IS_ERR_OR_NULL(drvr->dbgfs_dir)) 112 debugfs_remove_recursive(drvr->dbgfs_dir); 113 } 114 115 struct dentry *brcmf_debugfs_get_devdir(struct brcmf_pub *drvr) 116 { 117 return drvr->dbgfs_dir; 118 } 119 120 int brcmf_debugfs_add_entry(struct brcmf_pub *drvr, const char *fn, 121 int (*read_fn)(struct seq_file *seq, void *data)) 122 { 123 struct dentry *e; 124 125 e = debugfs_create_devm_seqfile(drvr->bus_if->dev, fn, 126 drvr->dbgfs_dir, read_fn); 127 return PTR_ERR_OR_ZERO(e); 128 } 129