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