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![Viresh Kumar](/assets/img/avatar_default.png)
Its a bit odd that debugfs_create_bool() takes 'u32 *' as an argument, when all it needs is a boolean pointer. It would be better to update this API to make it accept 'bool *' instead, as that will make it more consistent and often more convenient. Over that bool takes just a byte. That required updates to all user sites as well, in the same commit updating the API. regmap core was also using debugfs_{read|write}_file_bool(), directly and variable types were updated for that to be bool as well. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Mark Brown <broonie@kernel.org> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
393 lines
9.2 KiB
C
393 lines
9.2 KiB
C
/*
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* Ultra Wide Band
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* Debug support
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*
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* Copyright (C) 2005-2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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* Copyright (C) 2008 Cambridge Silicon Radio Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* FIXME: doc
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*/
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/notifier.h>
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#include <linux/device.h>
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <linux/seq_file.h>
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#include <linux/uwb/debug-cmd.h>
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#include "uwb-internal.h"
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/*
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* Debug interface
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*
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* Per radio controller debugfs files (in uwb/uwbN/):
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*
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* command: Flexible command interface (see <linux/uwb/debug-cmd.h>).
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*
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* reservations: information on reservations.
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*
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* accept: Set to true (Y or 1) to accept reservation requests from
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* peers.
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*
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* drp_avail: DRP availability information.
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*/
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struct uwb_dbg {
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struct uwb_pal pal;
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bool accept;
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struct list_head rsvs;
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struct dentry *root_d;
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struct dentry *command_f;
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struct dentry *reservations_f;
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struct dentry *accept_f;
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struct dentry *drp_avail_f;
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spinlock_t list_lock;
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};
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static struct dentry *root_dir;
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static void uwb_dbg_rsv_cb(struct uwb_rsv *rsv)
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{
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struct uwb_dbg *dbg = rsv->pal_priv;
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uwb_rsv_dump("debug", rsv);
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if (rsv->state == UWB_RSV_STATE_NONE) {
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spin_lock(&dbg->list_lock);
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list_del(&rsv->pal_node);
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spin_unlock(&dbg->list_lock);
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uwb_rsv_destroy(rsv);
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}
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}
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static int cmd_rsv_establish(struct uwb_rc *rc,
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struct uwb_dbg_cmd_rsv_establish *cmd)
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{
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struct uwb_mac_addr macaddr;
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struct uwb_rsv *rsv;
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struct uwb_dev *target;
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int ret;
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memcpy(&macaddr, cmd->target, sizeof(macaddr));
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target = uwb_dev_get_by_macaddr(rc, &macaddr);
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if (target == NULL)
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return -ENODEV;
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rsv = uwb_rsv_create(rc, uwb_dbg_rsv_cb, rc->dbg);
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if (rsv == NULL) {
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uwb_dev_put(target);
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return -ENOMEM;
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}
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rsv->target.type = UWB_RSV_TARGET_DEV;
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rsv->target.dev = target;
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rsv->type = cmd->type;
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rsv->max_mas = cmd->max_mas;
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rsv->min_mas = cmd->min_mas;
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rsv->max_interval = cmd->max_interval;
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ret = uwb_rsv_establish(rsv);
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if (ret)
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uwb_rsv_destroy(rsv);
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else {
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spin_lock(&(rc->dbg)->list_lock);
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list_add_tail(&rsv->pal_node, &rc->dbg->rsvs);
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spin_unlock(&(rc->dbg)->list_lock);
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}
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return ret;
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}
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static int cmd_rsv_terminate(struct uwb_rc *rc,
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struct uwb_dbg_cmd_rsv_terminate *cmd)
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{
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struct uwb_rsv *rsv, *found = NULL;
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int i = 0;
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spin_lock(&(rc->dbg)->list_lock);
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list_for_each_entry(rsv, &rc->dbg->rsvs, pal_node) {
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if (i == cmd->index) {
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found = rsv;
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uwb_rsv_get(found);
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break;
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}
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i++;
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}
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spin_unlock(&(rc->dbg)->list_lock);
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if (!found)
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return -EINVAL;
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uwb_rsv_terminate(found);
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uwb_rsv_put(found);
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return 0;
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}
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static int cmd_ie_add(struct uwb_rc *rc, struct uwb_dbg_cmd_ie *ie_to_add)
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{
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return uwb_rc_ie_add(rc,
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(const struct uwb_ie_hdr *) ie_to_add->data,
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ie_to_add->len);
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}
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static int cmd_ie_rm(struct uwb_rc *rc, struct uwb_dbg_cmd_ie *ie_to_rm)
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{
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return uwb_rc_ie_rm(rc, ie_to_rm->data[0]);
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}
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static ssize_t command_write(struct file *file, const char __user *buf,
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size_t len, loff_t *off)
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{
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struct uwb_rc *rc = file->private_data;
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struct uwb_dbg_cmd cmd;
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int ret = 0;
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if (len != sizeof(struct uwb_dbg_cmd))
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return -EINVAL;
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if (copy_from_user(&cmd, buf, len) != 0)
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return -EFAULT;
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switch (cmd.type) {
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case UWB_DBG_CMD_RSV_ESTABLISH:
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ret = cmd_rsv_establish(rc, &cmd.rsv_establish);
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break;
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case UWB_DBG_CMD_RSV_TERMINATE:
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ret = cmd_rsv_terminate(rc, &cmd.rsv_terminate);
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break;
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case UWB_DBG_CMD_IE_ADD:
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ret = cmd_ie_add(rc, &cmd.ie_add);
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break;
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case UWB_DBG_CMD_IE_RM:
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ret = cmd_ie_rm(rc, &cmd.ie_rm);
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break;
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case UWB_DBG_CMD_RADIO_START:
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ret = uwb_radio_start(&rc->dbg->pal);
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break;
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case UWB_DBG_CMD_RADIO_STOP:
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uwb_radio_stop(&rc->dbg->pal);
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break;
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default:
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return -EINVAL;
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}
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return ret < 0 ? ret : len;
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}
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static const struct file_operations command_fops = {
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.open = simple_open,
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.write = command_write,
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.read = NULL,
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.llseek = no_llseek,
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.owner = THIS_MODULE,
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};
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static int reservations_print(struct seq_file *s, void *p)
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{
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struct uwb_rc *rc = s->private;
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struct uwb_rsv *rsv;
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mutex_lock(&rc->rsvs_mutex);
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list_for_each_entry(rsv, &rc->reservations, rc_node) {
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struct uwb_dev_addr devaddr;
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char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
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bool is_owner;
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uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr);
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if (rsv->target.type == UWB_RSV_TARGET_DEV) {
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devaddr = rsv->target.dev->dev_addr;
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is_owner = &rc->uwb_dev == rsv->owner;
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} else {
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devaddr = rsv->target.devaddr;
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is_owner = true;
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}
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uwb_dev_addr_print(target, sizeof(target), &devaddr);
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seq_printf(s, "%c %s -> %s: %s\n",
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is_owner ? 'O' : 'T',
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owner, target, uwb_rsv_state_str(rsv->state));
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seq_printf(s, " stream: %d type: %s\n",
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rsv->stream, uwb_rsv_type_str(rsv->type));
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seq_printf(s, " %*pb\n", UWB_NUM_MAS, rsv->mas.bm);
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}
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mutex_unlock(&rc->rsvs_mutex);
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return 0;
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}
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static int reservations_open(struct inode *inode, struct file *file)
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{
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return single_open(file, reservations_print, inode->i_private);
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}
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static const struct file_operations reservations_fops = {
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.open = reservations_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static int drp_avail_print(struct seq_file *s, void *p)
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{
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struct uwb_rc *rc = s->private;
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seq_printf(s, "global: %*pb\n", UWB_NUM_MAS, rc->drp_avail.global);
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seq_printf(s, "local: %*pb\n", UWB_NUM_MAS, rc->drp_avail.local);
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seq_printf(s, "pending: %*pb\n", UWB_NUM_MAS, rc->drp_avail.pending);
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return 0;
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}
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static int drp_avail_open(struct inode *inode, struct file *file)
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{
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return single_open(file, drp_avail_print, inode->i_private);
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}
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static const struct file_operations drp_avail_fops = {
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.open = drp_avail_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static void uwb_dbg_channel_changed(struct uwb_pal *pal, int channel)
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{
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struct device *dev = &pal->rc->uwb_dev.dev;
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if (channel > 0)
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dev_info(dev, "debug: channel %d started\n", channel);
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else
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dev_info(dev, "debug: channel stopped\n");
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}
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static void uwb_dbg_new_rsv(struct uwb_pal *pal, struct uwb_rsv *rsv)
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{
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struct uwb_dbg *dbg = container_of(pal, struct uwb_dbg, pal);
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if (dbg->accept) {
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spin_lock(&dbg->list_lock);
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list_add_tail(&rsv->pal_node, &dbg->rsvs);
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spin_unlock(&dbg->list_lock);
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uwb_rsv_accept(rsv, uwb_dbg_rsv_cb, dbg);
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}
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}
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/**
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* uwb_dbg_add_rc - add a debug interface for a radio controller
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* @rc: the radio controller
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*/
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void uwb_dbg_add_rc(struct uwb_rc *rc)
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{
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rc->dbg = kzalloc(sizeof(struct uwb_dbg), GFP_KERNEL);
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if (rc->dbg == NULL)
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return;
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INIT_LIST_HEAD(&rc->dbg->rsvs);
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spin_lock_init(&(rc->dbg)->list_lock);
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uwb_pal_init(&rc->dbg->pal);
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rc->dbg->pal.rc = rc;
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rc->dbg->pal.channel_changed = uwb_dbg_channel_changed;
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rc->dbg->pal.new_rsv = uwb_dbg_new_rsv;
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uwb_pal_register(&rc->dbg->pal);
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if (root_dir) {
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rc->dbg->root_d = debugfs_create_dir(dev_name(&rc->uwb_dev.dev),
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root_dir);
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rc->dbg->command_f = debugfs_create_file("command", 0200,
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rc->dbg->root_d, rc,
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&command_fops);
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rc->dbg->reservations_f = debugfs_create_file("reservations", 0444,
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rc->dbg->root_d, rc,
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&reservations_fops);
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rc->dbg->accept_f = debugfs_create_bool("accept", 0644,
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rc->dbg->root_d,
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&rc->dbg->accept);
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rc->dbg->drp_avail_f = debugfs_create_file("drp_avail", 0444,
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rc->dbg->root_d, rc,
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&drp_avail_fops);
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}
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}
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/**
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* uwb_dbg_del_rc - remove a radio controller's debug interface
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* @rc: the radio controller
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*/
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void uwb_dbg_del_rc(struct uwb_rc *rc)
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{
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struct uwb_rsv *rsv, *t;
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if (rc->dbg == NULL)
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return;
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list_for_each_entry_safe(rsv, t, &rc->dbg->rsvs, pal_node) {
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uwb_rsv_terminate(rsv);
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}
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uwb_pal_unregister(&rc->dbg->pal);
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if (root_dir) {
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debugfs_remove(rc->dbg->drp_avail_f);
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debugfs_remove(rc->dbg->accept_f);
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debugfs_remove(rc->dbg->reservations_f);
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debugfs_remove(rc->dbg->command_f);
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debugfs_remove(rc->dbg->root_d);
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}
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}
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/**
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* uwb_dbg_exit - initialize the debug interface sub-module
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*/
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void uwb_dbg_init(void)
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{
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root_dir = debugfs_create_dir("uwb", NULL);
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}
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/**
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* uwb_dbg_exit - clean-up the debug interface sub-module
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*/
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void uwb_dbg_exit(void)
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{
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debugfs_remove(root_dir);
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}
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/**
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* uwb_dbg_create_pal_dir - create a debugfs directory for a PAL
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* @pal: The PAL.
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*/
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struct dentry *uwb_dbg_create_pal_dir(struct uwb_pal *pal)
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{
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struct uwb_rc *rc = pal->rc;
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if (root_dir && rc->dbg && rc->dbg->root_d && pal->name)
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return debugfs_create_dir(pal->name, rc->dbg->root_d);
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return NULL;
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}
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