uwb: add the UWB stack (debug support)

Add various debugfs files, principaly for the reservation manager.

Signed-off-by: David Vrabel <david.vrabel@csr.com>

1 files changed, 367 insertions, 0 deletions

diff --git a/drivers/uwb/uwb-debug.c b/drivers/uwb/uwb-debug.c
new file mode 100644
index 000000000000..6d232c35d07d
--- /dev/null
+++ b/drivers/uwb/uwb-debug.c
@@ -0,0 +1,367 @@
+/*
+ * 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);
+}