Commit 599e8d80 authored by David Vrabel's avatar David Vrabel Committed by David Vrabel

uwb: add the UWB stack (debug support)

Add various debugfs files, principaly for the reservation manager.
Signed-off-by: default avatarDavid Vrabel <david.vrabel@csr.com>
parent 8cc13a09
/*
* Ultra Wide Band
* Debug support
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* FIXME: doc
*/
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/seq_file.h>
#include <linux/uwb/debug-cmd.h>
#define D_LOCAL 0
#include <linux/uwb/debug.h>
#include "uwb-internal.h"
void dump_bytes(struct device *dev, const void *_buf, size_t rsize)
{
const char *buf = _buf;
char line[32];
size_t offset = 0;
int cnt, cnt2;
for (cnt = 0; cnt < rsize; cnt += 8) {
size_t rtop = rsize - cnt < 8 ? rsize - cnt : 8;
for (offset = cnt2 = 0; cnt2 < rtop; cnt2++) {
offset += scnprintf(line + offset, sizeof(line) - offset,
"%02x ", buf[cnt + cnt2] & 0xff);
}
if (dev)
dev_info(dev, "%s\n", line);
else
printk(KERN_INFO "%s\n", line);
}
}
EXPORT_SYMBOL_GPL(dump_bytes);
/*
* Debug interface
*
* Per radio controller debugfs files (in uwb/uwbN/):
*
* command: Flexible command interface (see <linux/uwb/debug-cmd.h>).
*
* reservations: information on reservations.
*
* accept: Set to true (Y or 1) to accept reservation requests from
* peers.
*
* drp_avail: DRP availability information.
*/
struct uwb_dbg {
struct uwb_pal pal;
u32 accept;
struct list_head rsvs;
struct dentry *root_d;
struct dentry *command_f;
struct dentry *reservations_f;
struct dentry *accept_f;
struct dentry *drp_avail_f;
};
static struct dentry *root_dir;
static void uwb_dbg_rsv_cb(struct uwb_rsv *rsv)
{
struct uwb_rc *rc = rsv->rc;
struct device *dev = &rc->uwb_dev.dev;
struct uwb_dev_addr devaddr;
char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr);
if (rsv->target.type == UWB_RSV_TARGET_DEV)
devaddr = rsv->target.dev->dev_addr;
else
devaddr = rsv->target.devaddr;
uwb_dev_addr_print(target, sizeof(target), &devaddr);
dev_dbg(dev, "debug: rsv %s -> %s: %s\n",
owner, target, uwb_rsv_state_str(rsv->state));
}
static int cmd_rsv_establish(struct uwb_rc *rc,
struct uwb_dbg_cmd_rsv_establish *cmd)
{
struct uwb_mac_addr macaddr;
struct uwb_rsv *rsv;
struct uwb_dev *target;
int ret;
memcpy(&macaddr, cmd->target, sizeof(macaddr));
target = uwb_dev_get_by_macaddr(rc, &macaddr);
if (target == NULL)
return -ENODEV;
rsv = uwb_rsv_create(rc, uwb_dbg_rsv_cb, NULL);
if (rsv == NULL) {
uwb_dev_put(target);
return -ENOMEM;
}
rsv->owner = &rc->uwb_dev;
rsv->target.type = UWB_RSV_TARGET_DEV;
rsv->target.dev = target;
rsv->type = cmd->type;
rsv->max_mas = cmd->max_mas;
rsv->min_mas = cmd->min_mas;
rsv->sparsity = cmd->sparsity;
ret = uwb_rsv_establish(rsv);
if (ret)
uwb_rsv_destroy(rsv);
else
list_add_tail(&rsv->pal_node, &rc->dbg->rsvs);
return ret;
}
static int cmd_rsv_terminate(struct uwb_rc *rc,
struct uwb_dbg_cmd_rsv_terminate *cmd)
{
struct uwb_rsv *rsv, *found = NULL;
int i = 0;
list_for_each_entry(rsv, &rc->dbg->rsvs, pal_node) {
if (i == cmd->index) {
found = rsv;
break;
}
}
if (!found)
return -EINVAL;
list_del(&found->pal_node);
uwb_rsv_terminate(found);
return 0;
}
static int command_open(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
static ssize_t command_write(struct file *file, const char __user *buf,
size_t len, loff_t *off)
{
struct uwb_rc *rc = file->private_data;
struct uwb_dbg_cmd cmd;
int ret;
if (len != sizeof(struct uwb_dbg_cmd))
return -EINVAL;
if (copy_from_user(&cmd, buf, len) != 0)
return -EFAULT;
switch (cmd.type) {
case UWB_DBG_CMD_RSV_ESTABLISH:
ret = cmd_rsv_establish(rc, &cmd.rsv_establish);
break;
case UWB_DBG_CMD_RSV_TERMINATE:
ret = cmd_rsv_terminate(rc, &cmd.rsv_terminate);
break;
default:
return -EINVAL;
}
return ret < 0 ? ret : len;
}
static struct file_operations command_fops = {
.open = command_open,
.write = command_write,
.read = NULL,
.llseek = no_llseek,
.owner = THIS_MODULE,
};
static int reservations_print(struct seq_file *s, void *p)
{
struct uwb_rc *rc = s->private;
struct uwb_rsv *rsv;
mutex_lock(&rc->rsvs_mutex);
list_for_each_entry(rsv, &rc->reservations, rc_node) {
struct uwb_dev_addr devaddr;
char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
bool is_owner;
char buf[72];
uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr);
if (rsv->target.type == UWB_RSV_TARGET_DEV) {
devaddr = rsv->target.dev->dev_addr;
is_owner = &rc->uwb_dev == rsv->owner;
} else {
devaddr = rsv->target.devaddr;
is_owner = true;
}
uwb_dev_addr_print(target, sizeof(target), &devaddr);
seq_printf(s, "%c %s -> %s: %s\n",
is_owner ? 'O' : 'T',
owner, target, uwb_rsv_state_str(rsv->state));
seq_printf(s, " stream: %d type: %s\n",
rsv->stream, uwb_rsv_type_str(rsv->type));
bitmap_scnprintf(buf, sizeof(buf), rsv->mas.bm, UWB_NUM_MAS);
seq_printf(s, " %s\n", buf);
}
mutex_unlock(&rc->rsvs_mutex);
return 0;
}
static int reservations_open(struct inode *inode, struct file *file)
{
return single_open(file, reservations_print, inode->i_private);
}
static struct file_operations reservations_fops = {
.open = reservations_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static int drp_avail_print(struct seq_file *s, void *p)
{
struct uwb_rc *rc = s->private;
char buf[72];
bitmap_scnprintf(buf, sizeof(buf), rc->drp_avail.global, UWB_NUM_MAS);
seq_printf(s, "global: %s\n", buf);
bitmap_scnprintf(buf, sizeof(buf), rc->drp_avail.local, UWB_NUM_MAS);
seq_printf(s, "local: %s\n", buf);
bitmap_scnprintf(buf, sizeof(buf), rc->drp_avail.pending, UWB_NUM_MAS);
seq_printf(s, "pending: %s\n", buf);
return 0;
}
static int drp_avail_open(struct inode *inode, struct file *file)
{
return single_open(file, drp_avail_print, inode->i_private);
}
static struct file_operations drp_avail_fops = {
.open = drp_avail_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static void uwb_dbg_new_rsv(struct uwb_rsv *rsv)
{
struct uwb_rc *rc = rsv->rc;
if (rc->dbg->accept)
uwb_rsv_accept(rsv, uwb_dbg_rsv_cb, NULL);
}
/**
* uwb_dbg_add_rc - add a debug interface for a radio controller
* @rc: the radio controller
*/
void uwb_dbg_add_rc(struct uwb_rc *rc)
{
rc->dbg = kzalloc(sizeof(struct uwb_dbg), GFP_KERNEL);
if (rc->dbg == NULL)
return;
INIT_LIST_HEAD(&rc->dbg->rsvs);
uwb_pal_init(&rc->dbg->pal);
rc->dbg->pal.new_rsv = uwb_dbg_new_rsv;
uwb_pal_register(rc, &rc->dbg->pal);
if (root_dir) {
rc->dbg->root_d = debugfs_create_dir(dev_name(&rc->uwb_dev.dev),
root_dir);
rc->dbg->command_f = debugfs_create_file("command", 0200,
rc->dbg->root_d, rc,
&command_fops);
rc->dbg->reservations_f = debugfs_create_file("reservations", 0444,
rc->dbg->root_d, rc,
&reservations_fops);
rc->dbg->accept_f = debugfs_create_bool("accept", 0644,
rc->dbg->root_d,
&rc->dbg->accept);
rc->dbg->drp_avail_f = debugfs_create_file("drp_avail", 0444,
rc->dbg->root_d, rc,
&drp_avail_fops);
}
}
/**
* uwb_dbg_add_rc - remove a radio controller's debug interface
* @rc: the radio controller
*/
void uwb_dbg_del_rc(struct uwb_rc *rc)
{
struct uwb_rsv *rsv, *t;
if (rc->dbg == NULL)
return;
list_for_each_entry_safe(rsv, t, &rc->dbg->rsvs, pal_node) {
uwb_rsv_destroy(rsv);
}
uwb_pal_unregister(rc, &rc->dbg->pal);
if (root_dir) {
debugfs_remove(rc->dbg->drp_avail_f);
debugfs_remove(rc->dbg->accept_f);
debugfs_remove(rc->dbg->reservations_f);
debugfs_remove(rc->dbg->command_f);
debugfs_remove(rc->dbg->root_d);
}
}
/**
* uwb_dbg_exit - initialize the debug interface sub-module
*/
void uwb_dbg_init(void)
{
root_dir = debugfs_create_dir("uwb", NULL);
}
/**
* uwb_dbg_exit - clean-up the debug interface sub-module
*/
void uwb_dbg_exit(void)
{
debugfs_remove(root_dir);
}
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