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 brcmf_dbg(TRACE, "enter: bsscfgidx=%d\n", ifp->bsscfgidx); 62 63 return brcmf_debug_create_memdump(ifp->drvr->bus_if, data, 64 evtmsg->datalen); 65 } 66 67 void brcmf_debugfs_init(void) 68 { 69 root_folder = debugfs_create_dir(KBUILD_MODNAME, NULL); 70 if (IS_ERR(root_folder)) 71 root_folder = NULL; 72 } 73 74 void brcmf_debugfs_exit(void) 75 { 76 if (!root_folder) 77 return; 78 79 debugfs_remove_recursive(root_folder); 80 root_folder = NULL; 81 } 82 83 int brcmf_debug_attach(struct brcmf_pub *drvr) 84 { 85 struct device *dev = drvr->bus_if->dev; 86 87 if (!root_folder) 88 return -ENODEV; 89 90 drvr->dbgfs_dir = debugfs_create_dir(dev_name(dev), root_folder); 91 if (IS_ERR(drvr->dbgfs_dir)) 92 return PTR_ERR(drvr->dbgfs_dir); 93 94 95 return brcmf_fweh_register(drvr, BRCMF_E_PSM_WATCHDOG, 96 brcmf_debug_psm_watchdog_notify); 97 } 98 99 void brcmf_debug_detach(struct brcmf_pub *drvr) 100 { 101 brcmf_fweh_unregister(drvr, BRCMF_E_PSM_WATCHDOG); 102 103 if (!IS_ERR_OR_NULL(drvr->dbgfs_dir)) 104 debugfs_remove_recursive(drvr->dbgfs_dir); 105 } 106 107 struct dentry *brcmf_debugfs_get_devdir(struct brcmf_pub *drvr) 108 { 109 return drvr->dbgfs_dir; 110 } 111 112 int brcmf_debugfs_add_entry(struct brcmf_pub *drvr, const char *fn, 113 int (*read_fn)(struct seq_file *seq, void *data)) 114 { 115 struct dentry *e; 116 117 e = debugfs_create_devm_seqfile(drvr->bus_if->dev, fn, 118 drvr->dbgfs_dir, read_fn); 119 return PTR_ERR_OR_ZERO(e); 120 } 121