forked from Minki/linux
uwb: per-radio controller event thread and beacon cache
Use an event thread per-radio controller so processing events from one radio controller doesn't delay another. A radio controller shouldn't have information on devices seen by a different radio controller (they may be on different channels) so make the beacon cache per-radio controller. Signed-off-by: Stefano Panella <stefano.panella@csr.com> Signed-off-by: David Vrabel <david.vrabel@csr.com>
This commit is contained in:
parent
6d5a681dfb
commit
fec1a5932f
@ -168,12 +168,6 @@ out_up:
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* FIXME: use something faster for search than a list
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*/
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struct uwb_beca uwb_beca = {
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.list = LIST_HEAD_INIT(uwb_beca.list),
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.mutex = __MUTEX_INITIALIZER(uwb_beca.mutex)
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};
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void uwb_bce_kfree(struct kref *_bce)
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{
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struct uwb_beca_e *bce = container_of(_bce, struct uwb_beca_e, refcnt);
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@ -185,10 +179,11 @@ void uwb_bce_kfree(struct kref *_bce)
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/* Find a beacon by dev addr in the cache */
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static
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struct uwb_beca_e *__uwb_beca_find_bydev(const struct uwb_dev_addr *dev_addr)
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struct uwb_beca_e *__uwb_beca_find_bydev(struct uwb_rc *rc,
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const struct uwb_dev_addr *dev_addr)
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{
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struct uwb_beca_e *bce, *next;
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list_for_each_entry_safe(bce, next, &uwb_beca.list, node) {
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list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) {
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d_printf(6, NULL, "looking for addr %02x:%02x in %02x:%02x\n",
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dev_addr->data[0], dev_addr->data[1],
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bce->dev_addr.data[0], bce->dev_addr.data[1]);
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@ -202,10 +197,11 @@ out:
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/* Find a beacon by dev addr in the cache */
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static
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struct uwb_beca_e *__uwb_beca_find_bymac(const struct uwb_mac_addr *mac_addr)
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struct uwb_beca_e *__uwb_beca_find_bymac(struct uwb_rc *rc,
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const struct uwb_mac_addr *mac_addr)
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{
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struct uwb_beca_e *bce, *next;
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list_for_each_entry_safe(bce, next, &uwb_beca.list, node) {
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list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) {
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if (!memcmp(bce->mac_addr, mac_addr->data,
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sizeof(struct uwb_mac_addr)))
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goto out;
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@ -229,11 +225,11 @@ struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc,
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struct uwb_dev *found = NULL;
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struct uwb_beca_e *bce;
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mutex_lock(&uwb_beca.mutex);
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bce = __uwb_beca_find_bydev(devaddr);
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mutex_lock(&rc->uwb_beca.mutex);
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bce = __uwb_beca_find_bydev(rc, devaddr);
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if (bce)
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found = uwb_dev_try_get(rc, bce->uwb_dev);
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mutex_unlock(&uwb_beca.mutex);
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mutex_unlock(&rc->uwb_beca.mutex);
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return found;
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}
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@ -249,11 +245,11 @@ struct uwb_dev *uwb_dev_get_by_macaddr(struct uwb_rc *rc,
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struct uwb_dev *found = NULL;
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struct uwb_beca_e *bce;
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mutex_lock(&uwb_beca.mutex);
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bce = __uwb_beca_find_bymac(macaddr);
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mutex_lock(&rc->uwb_beca.mutex);
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bce = __uwb_beca_find_bymac(rc, macaddr);
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if (bce)
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found = uwb_dev_try_get(rc, bce->uwb_dev);
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mutex_unlock(&uwb_beca.mutex);
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mutex_unlock(&rc->uwb_beca.mutex);
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return found;
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}
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@ -274,7 +270,9 @@ static void uwb_beca_e_init(struct uwb_beca_e *bce)
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* @bf: Beacon frame (part of b, really)
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* @ts_jiffies: Timestamp (in jiffies) when the beacon was received
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*/
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struct uwb_beca_e *__uwb_beca_add(struct uwb_rc_evt_beacon *be,
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static
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struct uwb_beca_e *__uwb_beca_add(struct uwb_rc *rc,
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struct uwb_rc_evt_beacon *be,
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struct uwb_beacon_frame *bf,
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unsigned long ts_jiffies)
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{
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@ -286,7 +284,7 @@ struct uwb_beca_e *__uwb_beca_add(struct uwb_rc_evt_beacon *be,
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uwb_beca_e_init(bce);
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bce->ts_jiffies = ts_jiffies;
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bce->uwb_dev = NULL;
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list_add(&bce->node, &uwb_beca.list);
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list_add(&bce->node, &rc->uwb_beca.list);
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return bce;
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}
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@ -295,13 +293,13 @@ struct uwb_beca_e *__uwb_beca_add(struct uwb_rc_evt_beacon *be,
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*
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* Remove associated devicest too.
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*/
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void uwb_beca_purge(void)
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void uwb_beca_purge(struct uwb_rc *rc)
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{
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struct uwb_beca_e *bce, *next;
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unsigned long expires;
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mutex_lock(&uwb_beca.mutex);
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list_for_each_entry_safe(bce, next, &uwb_beca.list, node) {
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mutex_lock(&rc->uwb_beca.mutex);
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list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) {
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expires = bce->ts_jiffies + msecs_to_jiffies(beacon_timeout_ms);
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if (time_after(jiffies, expires)) {
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uwbd_dev_offair(bce);
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@ -309,19 +307,20 @@ void uwb_beca_purge(void)
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uwb_bce_put(bce);
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}
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}
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mutex_unlock(&uwb_beca.mutex);
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mutex_unlock(&rc->uwb_beca.mutex);
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}
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/* Clean up the whole beacon cache. Called on shutdown */
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void uwb_beca_release(void)
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void uwb_beca_release(struct uwb_rc *rc)
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{
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struct uwb_beca_e *bce, *next;
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mutex_lock(&uwb_beca.mutex);
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list_for_each_entry_safe(bce, next, &uwb_beca.list, node) {
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mutex_lock(&rc->uwb_beca.mutex);
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list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) {
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list_del(&bce->node);
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uwb_bce_put(bce);
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}
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mutex_unlock(&uwb_beca.mutex);
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mutex_unlock(&rc->uwb_beca.mutex);
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}
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static void uwb_beacon_print(struct uwb_rc *rc, struct uwb_rc_evt_beacon *be,
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@ -437,18 +436,18 @@ int uwbd_evt_handle_rc_beacon(struct uwb_event *evt)
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if (uwb_mac_addr_bcast(&bf->Device_Identifier))
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return 0;
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mutex_lock(&uwb_beca.mutex);
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bce = __uwb_beca_find_bymac(&bf->Device_Identifier);
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mutex_lock(&rc->uwb_beca.mutex);
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bce = __uwb_beca_find_bymac(rc, &bf->Device_Identifier);
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if (bce == NULL) {
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/* Not in there, a new device is pinging */
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uwb_beacon_print(evt->rc, be, bf);
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bce = __uwb_beca_add(be, bf, evt->ts_jiffies);
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bce = __uwb_beca_add(rc, be, bf, evt->ts_jiffies);
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if (bce == NULL) {
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mutex_unlock(&uwb_beca.mutex);
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mutex_unlock(&rc->uwb_beca.mutex);
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return -ENOMEM;
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}
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}
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mutex_unlock(&uwb_beca.mutex);
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mutex_unlock(&rc->uwb_beca.mutex);
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mutex_lock(&bce->mutex);
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/* purge old beacon data */
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@ -118,7 +118,6 @@ static int __init uwb_subsys_init(void)
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result = class_register(&uwb_rc_class);
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if (result < 0)
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goto error_uwb_rc_class_register;
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uwbd_start();
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uwb_dbg_init();
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return 0;
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@ -132,7 +131,6 @@ module_init(uwb_subsys_init);
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static void __exit uwb_subsys_exit(void)
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{
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uwb_dbg_exit();
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uwbd_stop();
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class_unregister(&uwb_rc_class);
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uwb_est_destroy();
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return;
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@ -36,8 +36,6 @@
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#include <linux/etherdevice.h>
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#include <linux/usb.h>
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#define D_LOCAL 1
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#include <linux/uwb/debug.h>
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#include "uwb-internal.h"
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static int uwb_rc_index_match(struct device *dev, void *data)
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@ -83,7 +81,6 @@ static void uwb_rc_sys_release(struct device *dev)
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uwb_rc_neh_destroy(rc);
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uwb_rc_ie_release(rc);
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d_printf(1, dev, "freed uwb_rc %p\n", rc);
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kfree(rc);
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}
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@ -100,6 +97,8 @@ void uwb_rc_init(struct uwb_rc *rc)
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rc->scan_type = UWB_SCAN_DISABLED;
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INIT_LIST_HEAD(&rc->notifs_chain.list);
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mutex_init(&rc->notifs_chain.mutex);
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INIT_LIST_HEAD(&rc->uwb_beca.list);
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mutex_init(&rc->uwb_beca.mutex);
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uwb_drp_avail_init(rc);
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uwb_rc_ie_init(rc);
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uwb_rsv_init(rc);
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@ -250,6 +249,12 @@ int uwb_rc_add(struct uwb_rc *rc, struct device *parent_dev, void *priv)
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rc->priv = priv;
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init_waitqueue_head(&rc->uwbd.wq);
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INIT_LIST_HEAD(&rc->uwbd.event_list);
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spin_lock_init(&rc->uwbd.event_list_lock);
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uwbd_start(rc);
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result = rc->start(rc);
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if (result < 0)
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goto error_rc_start;
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@ -284,7 +289,7 @@ error_sys_add:
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error_dev_add:
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error_rc_setup:
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rc->stop(rc);
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uwbd_flush(rc);
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uwbd_stop(rc);
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error_rc_start:
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return result;
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}
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@ -315,16 +320,18 @@ void uwb_rc_rm(struct uwb_rc *rc)
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uwb_rc_reset(rc);
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rc->stop(rc);
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uwbd_flush(rc);
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uwbd_stop(rc);
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uwb_dev_lock(&rc->uwb_dev);
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rc->priv = NULL;
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rc->cmd = NULL;
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uwb_dev_unlock(&rc->uwb_dev);
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mutex_lock(&uwb_beca.mutex);
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mutex_lock(&rc->uwb_beca.mutex);
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uwb_dev_for_each(rc, uwb_dev_offair_helper, NULL);
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__uwb_rc_sys_rm(rc);
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mutex_unlock(&uwb_beca.mutex);
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mutex_unlock(&rc->uwb_beca.mutex);
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uwb_beca_release(rc);
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uwb_dev_rm(&rc->uwb_dev);
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}
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EXPORT_SYMBOL_GPL(uwb_rc_rm);
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@ -160,8 +160,8 @@ struct uwb_event {
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};
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};
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extern void uwbd_start(void);
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extern void uwbd_stop(void);
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extern void uwbd_start(struct uwb_rc *rc);
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extern void uwbd_stop(struct uwb_rc *rc);
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extern struct uwb_event *uwb_event_alloc(size_t, gfp_t gfp_mask);
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extern void uwbd_event_queue(struct uwb_event *);
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void uwbd_flush(struct uwb_rc *rc);
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@ -194,15 +194,6 @@ int uwbd_evt_handle_rc_dev_addr_conflict(struct uwb_event *evt);
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extern unsigned long beacon_timeout_ms;
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/** Beacon cache list */
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struct uwb_beca {
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struct list_head list;
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size_t entries;
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struct mutex mutex;
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};
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extern struct uwb_beca uwb_beca;
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/**
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* Beacon cache entry
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*
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@ -229,9 +220,6 @@ struct uwb_beca_e {
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struct uwb_beacon_frame;
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extern ssize_t uwb_bce_print_IEs(struct uwb_dev *, struct uwb_beca_e *,
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char *, size_t);
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extern struct uwb_beca_e *__uwb_beca_add(struct uwb_rc_evt_beacon *,
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struct uwb_beacon_frame *,
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unsigned long);
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extern void uwb_bce_kfree(struct kref *_bce);
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static inline void uwb_bce_get(struct uwb_beca_e *bce)
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@ -242,8 +230,8 @@ static inline void uwb_bce_put(struct uwb_beca_e *bce)
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{
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kref_put(&bce->refcnt, uwb_bce_kfree);
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}
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extern void uwb_beca_purge(void);
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extern void uwb_beca_release(void);
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extern void uwb_beca_purge(struct uwb_rc *rc);
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extern void uwb_beca_release(struct uwb_rc *rc);
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struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc,
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const struct uwb_dev_addr *devaddr);
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@ -170,8 +170,6 @@ static const struct uwbd_event uwbd_message_handlers[] = {
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},
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};
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static DEFINE_MUTEX(uwbd_event_mutex);
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/**
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* Handle an URC event passed to the UWB Daemon
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*
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@ -235,19 +233,10 @@ static void uwbd_event_handle_message(struct uwb_event *evt)
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return;
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}
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/* If this is a reset event we need to drop the
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* uwbd_event_mutex or it deadlocks when the reset handler
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* attempts to flush the uwbd events. */
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if (evt->message == UWB_EVT_MSG_RESET)
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mutex_unlock(&uwbd_event_mutex);
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result = uwbd_message_handlers[evt->message].handler(evt);
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if (result < 0)
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dev_err(&rc->uwb_dev.dev, "UWBD: '%s' message failed: %d\n",
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uwbd_message_handlers[evt->message].name, result);
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if (evt->message == UWB_EVT_MSG_RESET)
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mutex_lock(&uwbd_event_mutex);
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}
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static void uwbd_event_handle(struct uwb_event *evt)
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@ -275,20 +264,6 @@ static void uwbd_event_handle(struct uwb_event *evt)
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__uwb_rc_put(rc); /* for the __uwb_rc_get() in uwb_rc_notif_cb() */
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}
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/* The UWB Daemon */
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/** Daemon's PID: used to decide if we can queue or not */
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static int uwbd_pid;
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/** Daemon's task struct for managing the kthread */
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static struct task_struct *uwbd_task;
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/** Daemon's waitqueue for waiting for new events */
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static DECLARE_WAIT_QUEUE_HEAD(uwbd_wq);
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/** Daemon's list of events; we queue/dequeue here */
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static struct list_head uwbd_event_list = LIST_HEAD_INIT(uwbd_event_list);
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/** Daemon's list lock to protect concurent access */
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static DEFINE_SPINLOCK(uwbd_event_list_lock);
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/**
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* UWB Daemon
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@ -302,65 +277,58 @@ static DEFINE_SPINLOCK(uwbd_event_list_lock);
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* FIXME: should change so we don't have a 1HZ timer all the time, but
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* only if there are devices.
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*/
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static int uwbd(void *unused)
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static int uwbd(void *param)
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{
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struct uwb_rc *rc = param;
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unsigned long flags;
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struct list_head list = LIST_HEAD_INIT(list);
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struct uwb_event *evt, *nxt;
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struct uwb_event *evt;
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int should_stop = 0;
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while (1) {
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wait_event_interruptible_timeout(
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uwbd_wq,
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!list_empty(&uwbd_event_list)
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rc->uwbd.wq,
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!list_empty(&rc->uwbd.event_list)
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|| (should_stop = kthread_should_stop()),
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HZ);
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if (should_stop)
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break;
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try_to_freeze();
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mutex_lock(&uwbd_event_mutex);
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spin_lock_irqsave(&uwbd_event_list_lock, flags);
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list_splice_init(&uwbd_event_list, &list);
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spin_unlock_irqrestore(&uwbd_event_list_lock, flags);
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list_for_each_entry_safe(evt, nxt, &list, list_node) {
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spin_lock_irqsave(&rc->uwbd.event_list_lock, flags);
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if (!list_empty(&rc->uwbd.event_list)) {
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evt = list_first_entry(&rc->uwbd.event_list, struct uwb_event, list_node);
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list_del(&evt->list_node);
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} else
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evt = NULL;
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spin_unlock_irqrestore(&rc->uwbd.event_list_lock, flags);
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if (evt) {
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uwbd_event_handle(evt);
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kfree(evt);
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}
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mutex_unlock(&uwbd_event_mutex);
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uwb_beca_purge(); /* Purge devices that left */
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uwb_beca_purge(rc); /* Purge devices that left */
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}
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return 0;
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}
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/** Start the UWB daemon */
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void uwbd_start(void)
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void uwbd_start(struct uwb_rc *rc)
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{
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uwbd_task = kthread_run(uwbd, NULL, "uwbd");
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if (uwbd_task == NULL)
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rc->uwbd.task = kthread_run(uwbd, rc, "uwbd");
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if (rc->uwbd.task == NULL)
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||||
printk(KERN_ERR "UWB: Cannot start management daemon; "
|
||||
"UWB won't work\n");
|
||||
else
|
||||
uwbd_pid = uwbd_task->pid;
|
||||
rc->uwbd.pid = rc->uwbd.task->pid;
|
||||
}
|
||||
|
||||
/* Stop the UWB daemon and free any unprocessed events */
|
||||
void uwbd_stop(void)
|
||||
void uwbd_stop(struct uwb_rc *rc)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct uwb_event *evt, *nxt;
|
||||
kthread_stop(uwbd_task);
|
||||
spin_lock_irqsave(&uwbd_event_list_lock, flags);
|
||||
uwbd_pid = 0;
|
||||
list_for_each_entry_safe(evt, nxt, &uwbd_event_list, list_node) {
|
||||
if (evt->type == UWB_EVT_TYPE_NOTIF)
|
||||
kfree(evt->notif.rceb);
|
||||
kfree(evt);
|
||||
}
|
||||
spin_unlock_irqrestore(&uwbd_event_list_lock, flags);
|
||||
uwb_beca_release();
|
||||
kthread_stop(rc->uwbd.task);
|
||||
uwbd_flush(rc);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -377,18 +345,20 @@ void uwbd_stop(void)
|
||||
*/
|
||||
void uwbd_event_queue(struct uwb_event *evt)
|
||||
{
|
||||
struct uwb_rc *rc = evt->rc;
|
||||
unsigned long flags;
|
||||
spin_lock_irqsave(&uwbd_event_list_lock, flags);
|
||||
if (uwbd_pid != 0) {
|
||||
list_add(&evt->list_node, &uwbd_event_list);
|
||||
wake_up_all(&uwbd_wq);
|
||||
|
||||
spin_lock_irqsave(&rc->uwbd.event_list_lock, flags);
|
||||
if (rc->uwbd.pid != 0) {
|
||||
list_add(&evt->list_node, &rc->uwbd.event_list);
|
||||
wake_up_all(&rc->uwbd.wq);
|
||||
} else {
|
||||
__uwb_rc_put(evt->rc);
|
||||
if (evt->type == UWB_EVT_TYPE_NOTIF)
|
||||
kfree(evt->notif.rceb);
|
||||
kfree(evt);
|
||||
}
|
||||
spin_unlock_irqrestore(&uwbd_event_list_lock, flags);
|
||||
spin_unlock_irqrestore(&rc->uwbd.event_list_lock, flags);
|
||||
return;
|
||||
}
|
||||
|
||||
@ -396,10 +366,8 @@ void uwbd_flush(struct uwb_rc *rc)
|
||||
{
|
||||
struct uwb_event *evt, *nxt;
|
||||
|
||||
mutex_lock(&uwbd_event_mutex);
|
||||
|
||||
spin_lock_irq(&uwbd_event_list_lock);
|
||||
list_for_each_entry_safe(evt, nxt, &uwbd_event_list, list_node) {
|
||||
spin_lock_irq(&rc->uwbd.event_list_lock);
|
||||
list_for_each_entry_safe(evt, nxt, &rc->uwbd.event_list, list_node) {
|
||||
if (evt->rc == rc) {
|
||||
__uwb_rc_put(rc);
|
||||
list_del(&evt->list_node);
|
||||
@ -408,7 +376,5 @@ void uwbd_flush(struct uwb_rc *rc)
|
||||
kfree(evt);
|
||||
}
|
||||
}
|
||||
spin_unlock_irq(&uwbd_event_list_lock);
|
||||
|
||||
mutex_unlock(&uwbd_event_mutex);
|
||||
spin_unlock_irq(&rc->uwbd.event_list_lock);
|
||||
}
|
||||
|
@ -30,6 +30,7 @@
|
||||
#include <linux/device.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/timer.h>
|
||||
#include <linux/wait.h>
|
||||
#include <linux/workqueue.h>
|
||||
#include <linux/uwb/spec.h>
|
||||
|
||||
@ -86,6 +87,22 @@ struct uwb_notifs_chain {
|
||||
struct mutex mutex;
|
||||
};
|
||||
|
||||
/* Beacon cache list */
|
||||
struct uwb_beca {
|
||||
struct list_head list;
|
||||
size_t entries;
|
||||
struct mutex mutex;
|
||||
};
|
||||
|
||||
/* Event handling thread. */
|
||||
struct uwbd {
|
||||
int pid;
|
||||
struct task_struct *task;
|
||||
wait_queue_head_t wq;
|
||||
struct list_head event_list;
|
||||
spinlock_t event_list_lock;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct uwb_mas_bm - a bitmap of all MAS in a superframe
|
||||
* @bm: a bitmap of length #UWB_NUM_MAS
|
||||
@ -342,6 +359,9 @@ struct uwb_rc {
|
||||
enum uwb_scan_type scan_type:3;
|
||||
unsigned ready:1;
|
||||
struct uwb_notifs_chain notifs_chain;
|
||||
struct uwb_beca uwb_beca;
|
||||
|
||||
struct uwbd uwbd;
|
||||
|
||||
struct uwb_drp_avail drp_avail;
|
||||
struct list_head reservations;
|
||||
|
Loading…
Reference in New Issue
Block a user