linux_kernel/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c

/*
 * Copyright (c) 2012 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <linux/debugfs.h>
#include <linux/netdevice.h>
#include <linux/module.h>
#include <linux/devcoredump.h>

#include <brcmu_wifi.h>
#include <brcmu_utils.h>
#include "core.h"
#include "bus.h"
#include "fweh.h"
#include "debug.h"

static struct dentry *root_folder;

static int brcmf_debug_create_memdump(struct brcmf_bus *bus, const void *data,
				      size_t len)
{
	void *dump;
	size_t ramsize;
	int err;

	ramsize = brcmf_bus_get_ramsize(bus);
	if (!ramsize)
		return -ENOTSUPP;

	dump = vzalloc(len + ramsize);
	if (!dump)
		return -ENOMEM;

	memcpy(dump, data, len);
	err = brcmf_bus_get_memdump(bus, dump + len, ramsize);
	if (err) {
		vfree(dump);
		return err;
	}

	dev_coredumpv(bus->dev, dump, len + ramsize, GFP_KERNEL);

	return 0;
}

static int brcmf_debug_psm_watchdog_notify(struct brcmf_if *ifp,
					   const struct brcmf_event_msg *evtmsg,
					   void *data)
{
	int err;

	brcmf_dbg(TRACE, "enter: bsscfgidx=%d\n", ifp->bsscfgidx);

	brcmf_err("PSM's watchdog has fired!\n");

	err = brcmf_debug_create_memdump(ifp->drvr->bus_if, data,
					 evtmsg->datalen);
	if (err)
		brcmf_err("Failed to get memory dump, %d\n", err);

	return err;
}

void brcmf_debugfs_init(void)
{
	root_folder = debugfs_create_dir(KBUILD_MODNAME, NULL);
	if (IS_ERR(root_folder))
		root_folder = NULL;
}

void brcmf_debugfs_exit(void)
{
	if (!root_folder)
		return;

	debugfs_remove_recursive(root_folder);
	root_folder = NULL;
}

int brcmf_debug_attach(struct brcmf_pub *drvr)
{
	struct device *dev = drvr->bus_if->dev;

	if (!root_folder)
		return -ENODEV;

	drvr->dbgfs_dir = debugfs_create_dir(dev_name(dev), root_folder);
	if (IS_ERR(drvr->dbgfs_dir))
		return PTR_ERR(drvr->dbgfs_dir);


	return brcmf_fweh_register(drvr, BRCMF_E_PSM_WATCHDOG,
				   brcmf_debug_psm_watchdog_notify);
}

void brcmf_debug_detach(struct brcmf_pub *drvr)
{
	brcmf_fweh_unregister(drvr, BRCMF_E_PSM_WATCHDOG);

	if (!IS_ERR_OR_NULL(drvr->dbgfs_dir))
		debugfs_remove_recursive(drvr->dbgfs_dir);
}

struct dentry *brcmf_debugfs_get_devdir(struct brcmf_pub *drvr)
{
	return drvr->dbgfs_dir;
}

int brcmf_debugfs_add_entry(struct brcmf_pub *drvr, const char *fn,
			    int (*read_fn)(struct seq_file *seq, void *data))
{
	struct dentry *e;

	e = debugfs_create_devm_seqfile(drvr->bus_if->dev, fn,
					drvr->dbgfs_dir, read_fn);
	return PTR_ERR_OR_ZERO(e);
}