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 }
112