Changes in uspace/srv/devman/devman.c [79ae36dd:c1a0488] in mainline

File:

• uspace/srv/devman/devman.c (modified) (49 diffs)

uspace/srv/devman/devman.c

@@ -30 +30 @@
  * @{
  */
+/** @file Device Manager
+ *
+ * Locking order:
+ *   (1) driver_t.driver_mutex
+ *   (2) dev_tree_t.rwlock
+ *
+ * Synchronization:
+ *    - device_tree.rwlock protects:
+ *        - tree root, complete tree topology
+ *        - complete contents of device and function nodes
+ *    - dev_node_t.refcnt, fun_node_t.refcnt prevent nodes from
+ *      being deallocated
+ *    - find_xxx() functions increase reference count of returned object
+ *    - find_xxx_no_lock() do not increase reference count
+ *
+ * TODO
+ *    - Track all steady and transient device/function states
+ *    - Check states, wait for steady state on certain operations
+ */
 
 #include <errno.h>
@@ -37 +56 @@
 #include <ipc/driver.h>
 #include <ipc/devman.h>
-#include <devmap.h>
+#include <loc.h>
 #include <str_error.h>
 #include <stdio.h>
@@ -43 +62 @@
 #include "devman.h"
 
-fun_node_t *find_node_child(fun_node_t *parent, const char *name);
+static fun_node_t *find_node_child(dev_tree_t *, fun_node_t *, const char *);
 
 /* hash table operations */
@@ -66 +85 @@
 }
 
-static int devmap_functions_compare(unsigned long key[], hash_count_t keys,
+static int loc_functions_compare(unsigned long key[], hash_count_t keys,
     link_t *item)
 {
-        fun_node_t *fun = hash_table_get_instance(item, fun_node_t, devmap_fun);
-        return (fun->devmap_handle == (devmap_handle_t) key[0]);
-}
-
-static int devmap_devices_class_compare(unsigned long key[], hash_count_t keys,
-    link_t *item)
-{
-        dev_class_info_t *class_info
-            = hash_table_get_instance(item, dev_class_info_t, devmap_link);
-        assert(class_info != NULL);
-
-        return (class_info->devmap_handle == (devmap_handle_t) key[0]);
+        fun_node_t *fun = hash_table_get_instance(item, fun_node_t, loc_fun);
+        return (fun->service_id == (service_id_t) key[0]);
 }
 
@@ -99 +108 @@
 };
 
-static hash_table_operations_t devmap_devices_ops = {
+static hash_table_operations_t loc_devices_ops = {
         .hash = devices_hash,
-        .compare = devmap_functions_compare,
-        .remove_callback = devices_remove_callback
-};
-
-static hash_table_operations_t devmap_devices_class_ops = {
-        .hash = devices_hash,
-        .compare = devmap_devices_class_compare,
+        .compare = loc_functions_compare,
         .remove_callback = devices_remove_callback
 };
@@ -270 +273 @@
         }
         
-        ssize_t read_bytes = safe_read(fd, buf, len);
+        ssize_t read_bytes = read_all(fd, buf, len);
         if (read_bytes <= 0) {
-                log_msg(LVL_ERROR, "Unable to read file '%s'.", conf_path);
+                log_msg(LVL_ERROR, "Unable to read file '%s' (%zd).", conf_path,
+                    read_bytes);
                 goto cleanup;
         }
@@ -421 +425 @@
         }
         
-        insert_fun_node(tree, fun, clone_string(""), NULL);
+        fun_add_ref(fun);
+        insert_fun_node(tree, fun, str_dup(""), NULL);
+        
         match_id_t *id = create_match_id();
-        id->id = clone_string("root");
+        id->id = str_dup("root");
         id->score = 100;
         add_match_id(&fun->match_ids, id);
@@ -437 +443 @@
         }
         
+        dev_add_ref(dev);
         insert_dev_node(tree, dev, fun);
         
@@ -466 +473 @@
         fibril_mutex_lock(&drivers_list->drivers_mutex);
         
-        link_t *link = drivers_list->drivers.next;
-        while (link != &drivers_list->drivers) {
+        list_foreach(drivers_list->drivers, link) {
                 drv = list_get_instance(link, driver_t, drivers);
                 score = get_match_score(drv, node);
@@ -474 +480 @@
                         best_drv = drv;
                 }
-                link = link->next;
         }
         
@@ -484 +489 @@
 /** Assign a driver to a device.
  *
+ * @param tree          Device tree
  * @param node          The device's node in the device tree.
  * @param drv           The driver.
  */
-void attach_driver(dev_node_t *dev, driver_t *drv)
+void attach_driver(dev_tree_t *tree, dev_node_t *dev, driver_t *drv)
 {
         log_msg(LVL_DEBUG, "attach_driver(dev=\"%s\",drv=\"%s\")",
@@ -493 +499 @@
         
         fibril_mutex_lock(&drv->driver_mutex);
+        fibril_rwlock_write_lock(&tree->rwlock);
         
         dev->drv = drv;
         list_append(&dev->driver_devices, &drv->devices);
         
+        fibril_rwlock_write_unlock(&tree->rwlock);
+        fibril_mutex_unlock(&drv->driver_mutex);
+}
+
+/** Detach driver from device.
+ *
+ * @param tree          Device tree
+ * @param node          The device's node in the device tree.
+ * @param drv           The driver.
+ */
+void detach_driver(dev_tree_t *tree, dev_node_t *dev)
+{
+        driver_t *drv = dev->drv;
+        
+        assert(drv != NULL);
+        
+        log_msg(LVL_DEBUG, "detach_driver(dev=\"%s\",drv=\"%s\")",
+            dev->pfun->pathname, drv->name);
+        
+        fibril_mutex_lock(&drv->driver_mutex);
+        fibril_rwlock_write_lock(&tree->rwlock);
+        
+        dev->drv = NULL;
+        list_remove(&dev->driver_devices);
+        
+        fibril_rwlock_write_unlock(&tree->rwlock);
         fibril_mutex_unlock(&drv->driver_mutex);
 }
@@ -536 +569 @@
         driver_t *res = NULL;
         driver_t *drv = NULL;
-        link_t *link;
         
         fibril_mutex_lock(&drv_list->drivers_mutex);
         
-        link = drv_list->drivers.next;
-        while (link != &drv_list->drivers) {
+        list_foreach(drv_list->drivers, link) {
                 drv = list_get_instance(link, driver_t, drivers);
                 if (str_cmp(drv->name, drv_name) == 0) {
@@ -547 +578 @@
                         break;
                 }
-
-                link = link->next;
         }
         
@@ -569 +598 @@
 
         fibril_mutex_lock(&driver->driver_mutex);
-        
-        async_exch_t *exch = async_exchange_begin(driver->sess);
-        async_sess_t *sess = async_connect_me_to(EXCHANGE_SERIALIZE, exch,
-            DRIVER_DEVMAN, 0, 0);
-        async_exchange_end(exch);
-
-        if (!sess) {
-                fibril_mutex_unlock(&driver->driver_mutex);
-                return;
-        }
 
         /*
@@ -584 +603 @@
          * that has not been passed to the driver.
          */
-        link = driver->devices.next;
-        while (link != &driver->devices) {
+        link = driver->devices.head.next;
+        while (link != &driver->devices.head) {
                 dev = list_get_instance(link, dev_node_t, driver_devices);
+                fibril_rwlock_write_lock(&tree->rwlock);
+                
                 if (dev->passed_to_driver) {
+                        fibril_rwlock_write_unlock(&tree->rwlock);
                         link = link->next;
                         continue;
                 }
 
-                /*
-                 * We remove the device from the list to allow safe adding
-                 * of new devices (no one will touch our item this way).
-                 */
-                list_remove(link);
+                log_msg(LVL_DEBUG, "pass_devices_to_driver: dev->refcnt=%d\n",
+                    (int)atomic_get(&dev->refcnt));
+                dev_add_ref(dev);
 
                 /*
@@ -603 +623 @@
                  */
                 fibril_mutex_unlock(&driver->driver_mutex);
-
-                add_device(sess, driver, dev, tree);
+                fibril_rwlock_write_unlock(&tree->rwlock);
+
+                add_device(driver, dev, tree);
+
+                dev_del_ref(dev);
 
                 /*
@@ -613 +636 @@
 
                 /*
-                 * Insert the device back.
-                 * The order is not relevant here so no harm is done
-                 * (actually, the order would be preserved in most cases).
-                 */
-                list_append(link, &driver->devices);
-
-                /*
                  * Restart the cycle to go through all devices again.
                  */
-                link = driver->devices.next;
-        }
-
-        async_hangup(sess);
+                link = driver->devices.head.next;
+        }
 
         /*
@@ -706 +720 @@
 }
 
-/** Create devmap path and name for the function. */
-void devmap_register_tree_function(fun_node_t *fun, dev_tree_t *tree)
-{
-        char *devmap_pathname = NULL;
-        char *devmap_name = NULL;
-        
-        asprintf(&devmap_name, "%s", fun->pathname);
-        if (devmap_name == NULL)
+/** Create loc path and name for the function. */
+void loc_register_tree_function(fun_node_t *fun, dev_tree_t *tree)
+{
+        char *loc_pathname = NULL;
+        char *loc_name = NULL;
+        
+        assert(fibril_rwlock_is_locked(&tree->rwlock));
+        
+        asprintf(&loc_name, "%s", fun->pathname);
+        if (loc_name == NULL)
                 return;
         
-        replace_char(devmap_name, '/', DEVMAP_SEPARATOR);
-        
-        asprintf(&devmap_pathname, "%s/%s", DEVMAP_DEVICE_NAMESPACE,
-            devmap_name);
-        if (devmap_pathname == NULL) {
-                free(devmap_name);
+        replace_char(loc_name, '/', LOC_SEPARATOR);
+        
+        asprintf(&loc_pathname, "%s/%s", LOC_DEVICE_NAMESPACE,
+            loc_name);
+        if (loc_pathname == NULL) {
+                free(loc_name);
                 return;
         }
         
-        devmap_device_register_with_iface(devmap_pathname,
-            &fun->devmap_handle, DEVMAN_CONNECT_FROM_DEVMAP);
-        
-        tree_add_devmap_function(tree, fun);
-        
-        free(devmap_name);
-        free(devmap_pathname);
+        loc_service_register_with_iface(loc_pathname,
+            &fun->service_id, DEVMAN_CONNECT_FROM_LOC);
+        
+        tree_add_loc_function(tree, fun);
+        
+        free(loc_name);
+        free(loc_pathname);
 }
 
@@ -739 +755 @@
  * @param node          The device's node in the device tree.
  */
-void add_device(async_sess_t *sess, driver_t *drv, dev_node_t *dev,
-    dev_tree_t *tree)
+void add_device(driver_t *drv, dev_node_t *dev, dev_tree_t *tree)
 {
         /*
@@ -757 +772 @@
         }
         
-        async_exch_t *exch = async_exchange_begin(sess);
+        async_exch_t *exch = async_exchange_begin(drv->sess);
         
         ipc_call_t answer;
-        aid_t req = async_send_2(exch, DRIVER_ADD_DEVICE, dev->handle,
+        aid_t req = async_send_2(exch, DRIVER_DEV_ADD, dev->handle,
             parent_handle, &answer);
         
@@ -817 +832 @@
         
         /* Attach the driver to the device. */
-        attach_driver(dev, drv);
+        attach_driver(tree, dev, drv);
         
         fibril_mutex_lock(&drv->driver_mutex);
@@ -827 +842 @@
         fibril_mutex_unlock(&drv->driver_mutex);
 
-        if (is_running) {
-                /* Notify the driver about the new device. */
-                async_exch_t *exch = async_exchange_begin(drv->sess);
-                async_sess_t *sess = async_connect_me_to(EXCHANGE_SERIALIZE, exch,
-                    DRIVER_DEVMAN, 0, 0);
-                async_exchange_end(exch);
-                
-                if (sess) {
-                        add_device(sess, drv, dev, tree);
-                        async_hangup(sess);
-                }
-        }
-        
+        /* Notify the driver about the new device. */
+        if (is_running)
+                add_device(drv, dev, tree);
+        
+        fibril_mutex_lock(&drv->driver_mutex);
+        fibril_mutex_unlock(&drv->driver_mutex);
+
+        fibril_rwlock_write_lock(&tree->rwlock);
+        if (dev->pfun != NULL) {
+                dev->pfun->state = FUN_ON_LINE;
+        }
+        fibril_rwlock_write_unlock(&tree->rwlock);
         return true;
+}
+
+int driver_dev_remove(dev_tree_t *tree, dev_node_t *dev)
+{
+        async_exch_t *exch;
+        sysarg_t retval;
+        driver_t *drv;
+        devman_handle_t handle;
+        
+        assert(dev != NULL);
+        
+        log_msg(LVL_DEBUG, "driver_dev_remove(%p)", dev);
+        
+        fibril_rwlock_read_lock(&tree->rwlock);
+        drv = dev->drv;
+        handle = dev->handle;
+        fibril_rwlock_read_unlock(&tree->rwlock);
+        
+        exch = async_exchange_begin(drv->sess);
+        retval = async_req_1_0(exch, DRIVER_DEV_REMOVE, handle);
+        async_exchange_end(exch);
+        
+        return retval;
+
+}
+
+int driver_fun_online(dev_tree_t *tree, fun_node_t *fun)
+{
+        async_exch_t *exch;
+        sysarg_t retval;
+        driver_t *drv;
+        devman_handle_t handle;
+        
+        log_msg(LVL_DEBUG, "driver_fun_online(%p)", fun);
+
+        fibril_rwlock_read_lock(&tree->rwlock);
+        
+        if (fun->dev == NULL) {
+                /* XXX root function? */
+                fibril_rwlock_read_unlock(&tree->rwlock);
+                return EINVAL;
+        }
+        
+        drv = fun->dev->drv;
+        handle = fun->handle;
+        fibril_rwlock_read_unlock(&tree->rwlock);
+        
+        exch = async_exchange_begin(drv->sess);
+        retval = async_req_1_0(exch, DRIVER_FUN_ONLINE, handle);
+        loc_exchange_end(exch);
+        
+        return retval;
+}
+
+int driver_fun_offline(dev_tree_t *tree, fun_node_t *fun)
+{
+        async_exch_t *exch;
+        sysarg_t retval;
+        driver_t *drv;
+        devman_handle_t handle;
+        
+        log_msg(LVL_DEBUG, "driver_fun_offline(%p)", fun);
+
+        fibril_rwlock_read_lock(&tree->rwlock);
+        if (fun->dev == NULL) {
+                /* XXX root function? */
+                fibril_rwlock_read_unlock(&tree->rwlock);
+                return EINVAL;
+        }
+        
+        drv = fun->dev->drv;
+        handle = fun->handle;
+        fibril_rwlock_read_unlock(&tree->rwlock);
+        
+        exch = async_exchange_begin(drv->sess);
+        retval = async_req_1_0(exch, DRIVER_FUN_OFFLINE, handle);
+        loc_exchange_end(exch);
+        
+        return retval;
+
 }
 
@@ -861 +955 @@
         hash_table_create(&tree->devman_functions, DEVICE_BUCKETS, 1,
             &devman_functions_ops);
-        hash_table_create(&tree->devmap_functions, DEVICE_BUCKETS, 1,
-            &devmap_devices_ops);
+        hash_table_create(&tree->loc_functions, DEVICE_BUCKETS, 1,
+            &loc_devices_ops);
         
         fibril_rwlock_initialize(&tree->rwlock);
@@ -869 +963 @@
         if (!create_root_nodes(tree))
                 return false;
-
+    
         /* Find suitable driver and start it. */
-        return assign_driver(tree->root_node->child, drivers_list, tree);
+        dev_node_t *rdev = tree->root_node->child;
+        dev_add_ref(rdev);
+        int rc = assign_driver(rdev, drivers_list, tree);
+        dev_del_ref(rdev);
+        
+        return rc;
 }
 
@@ -882 +981 @@
 dev_node_t *create_dev_node(void)
 {
-        dev_node_t *res = malloc(sizeof(dev_node_t));
-        
-        if (res != NULL) {
-                memset(res, 0, sizeof(dev_node_t));
-                list_initialize(&res->functions);
-                link_initialize(&res->driver_devices);
-                link_initialize(&res->devman_dev);
-        }
-        
-        return res;
+        dev_node_t *dev;
+        
+        dev = calloc(1, sizeof(dev_node_t));
+        if (dev == NULL)
+                return NULL;
+        
+        atomic_set(&dev->refcnt, 0);
+        list_initialize(&dev->functions);
+        link_initialize(&dev->driver_devices);
+        link_initialize(&dev->devman_dev);
+        
+        return dev;
 }
 
@@ -907 +1008 @@
 }
 
+/** Increase device node reference count.
+ *
+ * @param dev   Device node
+ */
+void dev_add_ref(dev_node_t *dev)
+{
+        atomic_inc(&dev->refcnt);
+}
+
+/** Decrease device node reference count.
+ *
+ * When the count drops to zero the device node is freed.
+ *
+ * @param dev   Device node
+ */
+void dev_del_ref(dev_node_t *dev)
+{
+        if (atomic_predec(&dev->refcnt) == 0)
+                delete_dev_node(dev);
+}
+
+
 /** Find the device node structure of the device witch has the specified handle.
  *
@@ -936 +1059 @@
         fibril_rwlock_read_lock(&tree->rwlock);
         dev = find_dev_node_no_lock(tree, handle);
+        if (dev != NULL)
+                dev_add_ref(dev);
+        
         fibril_rwlock_read_unlock(&tree->rwlock);
         
@@ -941 +1067 @@
 }
 
+/** Get list of device functions. */
+int dev_get_functions(dev_tree_t *tree, dev_node_t *dev,
+    devman_handle_t *hdl_buf, size_t buf_size, size_t *act_size)
+{
+        size_t act_cnt;
+        size_t buf_cnt;
+
+        assert(fibril_rwlock_is_locked(&tree->rwlock));
+
+        buf_cnt = buf_size / sizeof(devman_handle_t);
+
+        act_cnt = list_count(&dev->functions);
+        *act_size = act_cnt * sizeof(devman_handle_t);
+
+        if (buf_size % sizeof(devman_handle_t) != 0)
+                return EINVAL;
+
+        size_t pos = 0;
+        list_foreach(dev->functions, item) {
+                fun_node_t *fun =
+                    list_get_instance(item, fun_node_t, dev_functions);
+
+                if (pos < buf_cnt) {
+                        hdl_buf[pos] = fun->handle;
+                }
+
+                pos++;
+        }
+
+        return EOK;
+}
+
+
 /* Function nodes */
 
@@ -949 +1108 @@
 fun_node_t *create_fun_node(void)
 {
-        fun_node_t *res = malloc(sizeof(fun_node_t));
-        
-        if (res != NULL) {
-                memset(res, 0, sizeof(fun_node_t));
-                link_initialize(&res->dev_functions);
-                list_initialize(&res->match_ids.ids);
-                list_initialize(&res->classes);
-                link_initialize(&res->devman_fun);
-                link_initialize(&res->devmap_fun);
-        }
-        
-        return res;
+        fun_node_t *fun;
+
+        fun = calloc(1, sizeof(fun_node_t));
+        if (fun == NULL)
+                return NULL;
+        
+        fun->state = FUN_INIT;
+        atomic_set(&fun->refcnt, 0);
+        link_initialize(&fun->dev_functions);
+        list_initialize(&fun->match_ids.ids);
+        link_initialize(&fun->devman_fun);
+        link_initialize(&fun->loc_fun);
+        
+        return fun;
 }
 
@@ -978 +1139 @@
 }
 
+/** Increase function node reference count.
+ *
+ * @param fun   Function node
+ */
+void fun_add_ref(fun_node_t *fun)
+{
+        atomic_inc(&fun->refcnt);
+}
+
+/** Decrease function node reference count.
+ *
+ * When the count drops to zero the function node is freed.
+ *
+ * @param fun   Function node
+ */
+void fun_del_ref(fun_node_t *fun)
+{
+        if (atomic_predec(&fun->refcnt) == 0)
+                delete_fun_node(fun);
+}
+
 /** Find the function node with the specified handle.
  *
@@ -988 +1170 @@
         unsigned long key = handle;
         link_t *link;
+        fun_node_t *fun;
         
         assert(fibril_rwlock_is_locked(&tree->rwlock));
@@ -995 +1178 @@
                 return NULL;
         
-        return hash_table_get_instance(link, fun_node_t, devman_fun);
+        fun = hash_table_get_instance(link, fun_node_t, devman_fun);
+        
+        return fun;
 }
 
@@ -1009 +1194 @@
         
         fibril_rwlock_read_lock(&tree->rwlock);
+        
         fun = find_fun_node_no_lock(tree, handle);
+        if (fun != NULL)
+                fun_add_ref(fun);
+        
         fibril_rwlock_read_unlock(&tree->rwlock);
         
@@ -1017 +1206 @@
 /** Create and set device's full path in device tree.
  *
+ * @param tree          Device tree
  * @param node          The device's device node.
  * @param parent        The parent device node.
@@ -1022 +1212 @@
  *                      resources etc.).
  */
-static bool set_fun_path(fun_node_t *fun, fun_node_t *parent)
-{
+static bool set_fun_path(dev_tree_t *tree, fun_node_t *fun, fun_node_t *parent)
+{
+        assert(fibril_rwlock_is_write_locked(&tree->rwlock));
         assert(fun->name != NULL);
         
@@ -1050 +1241 @@
  *
  * @param tree          The device tree.
- * @param node          The newly added device node. 
- * @param dev_name      The name of the newly added device.
- * @param parent        The parent device node.
+ * @param dev           The newly added device node.
+ * @param pfun          The parent function node.
  *
  * @return              True on success, false otherwise (insufficient resources
@@ -1059 +1249 @@
 bool insert_dev_node(dev_tree_t *tree, dev_node_t *dev, fun_node_t *pfun)
 {
-        assert(dev != NULL);
-        assert(tree != NULL);
         assert(fibril_rwlock_is_write_locked(&tree->rwlock));
         
@@ -1078 +1266 @@
 }
 
+/** Remove device from device tree.
+ *
+ * @param tree          Device tree
+ * @param dev           Device node
+ */
+void remove_dev_node(dev_tree_t *tree, dev_node_t *dev)
+{
+        assert(fibril_rwlock_is_write_locked(&tree->rwlock));
+        
+        log_msg(LVL_DEBUG, "remove_dev_node(dev=%p)", dev);
+        
+        /* Remove node from the handle-to-node map. */
+        unsigned long key = dev->handle;
+        hash_table_remove(&tree->devman_devices, &key, 1);
+        
+        /* Unlink from parent function. */
+        dev->pfun->child = NULL;
+        dev->pfun = NULL;
+        
+        dev->state = DEVICE_REMOVED;
+}
+
+
 /** Insert new function into device tree.
  *
  * @param tree          The device tree.
- * @param node          The newly added function node. 
- * @param dev_name      The name of the newly added function.
- * @param parent        Owning device node.
+ * @param fun           The newly added function node. 
+ * @param fun_name      The name of the newly added function.
+ * @param dev           Owning device node.
  *
  * @return              True on success, false otherwise (insufficient resources
@@ -1093 +1304 @@
         fun_node_t *pfun;
         
-        assert(fun != NULL);
-        assert(tree != NULL);
         assert(fun_name != NULL);
         assert(fibril_rwlock_is_write_locked(&tree->rwlock));
@@ -1105 +1314 @@
         
         fun->name = fun_name;
-        if (!set_fun_path(fun, pfun)) {
+        if (!set_fun_path(tree, fun, pfun)) {
                 return false;
         }
@@ -1120 +1329 @@
         
         return true;
+}
+
+/** Remove function from device tree.
+ *
+ * @param tree          Device tree
+ * @param node          Function node to remove
+ */
+void remove_fun_node(dev_tree_t *tree, fun_node_t *fun)
+{
+        assert(fibril_rwlock_is_write_locked(&tree->rwlock));
+        
+        /* Remove the node from the handle-to-node map. */
+        unsigned long key = fun->handle;
+        hash_table_remove(&tree->devman_functions, &key, 1);
+        
+        /* Remove the node from the list of its parent's children. */
+        if (fun->dev != NULL)
+                list_remove(&fun->dev_functions);
+        
+        fun->dev = NULL;
+        fun->state = FUN_REMOVED;
 }
 
@@ -1141 +1371 @@
         
         fun_node_t *fun = tree->root_node;
+        fun_add_ref(fun);
         /*
          * Relative path to the function from its parent (but with '/' at the
@@ -1147 +1378 @@
         char *rel_path = path;
         char *next_path_elem = NULL;
-        bool cont = true;
+        bool cont = (rel_path[1] != '\0');
         
         while (cont && fun != NULL) {
@@ -1158 +1389 @@
                 }
                 
-                fun = find_node_child(fun, rel_path + 1);
+                fun_node_t *cfun = find_node_child(tree, fun, rel_path + 1);
+                fun_del_ref(fun);
+                fun = cfun;
                 
                 if (cont) {
@@ -1176 +1409 @@
  * Device tree rwlock should be held at least for reading.
  *
+ * @param tree Device tree
  * @param dev Device the function belongs to.
  * @param name Function name (not path).
@@ -1181 +1415 @@
  * @retval NULL No function with given name.
  */
-fun_node_t *find_fun_node_in_device(dev_node_t *dev, const char *name)
-{
-        assert(dev != NULL);
+fun_node_t *find_fun_node_in_device(dev_tree_t *tree, dev_node_t *dev,
+    const char *name)
+{
         assert(name != NULL);
+        assert(fibril_rwlock_is_locked(&tree->rwlock));
 
         fun_node_t *fun;
-        link_t *link;
-
-        for (link = dev->functions.next;
-            link != &dev->functions;
-            link = link->next) {
+
+        list_foreach(dev->functions, link) {
                 fun = list_get_instance(link, fun_node_t, dev_functions);
 
-                if (str_cmp(name, fun->name) == 0)
+                if (str_cmp(name, fun->name) == 0) {
+                        fun_add_ref(fun);
                         return fun;
+                }
         }
 
@@ -1201 +1435 @@
 }
 
-/** Find function node by its class name and index. */
-fun_node_t *find_fun_node_by_class(class_list_t *class_list,
-    const char *class_name, const char *dev_name)
-{
-        assert(class_list != NULL);
-        assert(class_name != NULL);
-        assert(dev_name != NULL);
-
-        fibril_rwlock_read_lock(&class_list->rwlock);
-
-        dev_class_t *cl = find_dev_class_no_lock(class_list, class_name);
-        if (cl == NULL) {
-                fibril_rwlock_read_unlock(&class_list->rwlock);
-                return NULL;
-        }
-
-        dev_class_info_t *dev = find_dev_in_class(cl, dev_name);
-        if (dev == NULL) {
-                fibril_rwlock_read_unlock(&class_list->rwlock);
-                return NULL;
-        }
-
-        fun_node_t *fun = dev->fun;
-
-        fibril_rwlock_read_unlock(&class_list->rwlock);
-
-        return fun;
-}
-
-
 /** Find child function node with a specified name.
  *
  * Device tree rwlock should be held at least for reading.
  *
+ * @param tree          Device tree
  * @param parent        The parent function node.
  * @param name          The name of the child function.
  * @return              The child function node.
  */
-fun_node_t *find_node_child(fun_node_t *pfun, const char *name)
-{
-        return find_fun_node_in_device(pfun->child, name);
-}
-
-/* Device classes */
-
-/** Create device class.
- *
- * @return      Device class.
- */
-dev_class_t *create_dev_class(void)
-{
-        dev_class_t *cl;
-        
-        cl = (dev_class_t *) malloc(sizeof(dev_class_t));
-        if (cl != NULL) {
-                memset(cl, 0, sizeof(dev_class_t));
-                list_initialize(&cl->devices);
-                fibril_mutex_initialize(&cl->mutex);
-        }
-        
-        return cl;
-}
-
-/** Create device class info.
- *
- * @return              Device class info.
- */
-dev_class_info_t *create_dev_class_info(void)
-{
-        dev_class_info_t *info;
-        
-        info = (dev_class_info_t *) malloc(sizeof(dev_class_info_t));
-        if (info != NULL) {
-                memset(info, 0, sizeof(dev_class_info_t));
-                link_initialize(&info->dev_classes);
-                link_initialize(&info->devmap_link);
-                link_initialize(&info->link);
-        }
-        
-        return info;
-}
-
-size_t get_new_class_dev_idx(dev_class_t *cl)
-{
-        size_t dev_idx;
-        
-        fibril_mutex_lock(&cl->mutex);
-        dev_idx = ++cl->curr_dev_idx;
-        fibril_mutex_unlock(&cl->mutex);
-        
-        return dev_idx;
-}
-
-
-/** Create unique device name within the class.
- *
- * @param cl            The class.
- * @param base_dev_name Contains the base name for the device if it was
- *                      specified by the driver when it registered the device by
- *                      the class; NULL if driver specified no base name.
- * @return              The unique name for the device within the class.
- */
-char *create_dev_name_for_class(dev_class_t *cl, const char *base_dev_name)
-{
-        char *dev_name;
-        const char *base_name;
-        
-        if (base_dev_name != NULL)
-                base_name = base_dev_name;
-        else
-                base_name = cl->base_dev_name;
-        
-        size_t idx = get_new_class_dev_idx(cl);
-        asprintf(&dev_name, "%s%zu", base_name, idx);
-        
-        return dev_name;
-}
-
-/** Add the device function to the class.
- *
- * The device may be added to multiple classes and a class may contain multiple
- * devices. The class and the device are associated with each other by the
- * dev_class_info_t structure.
- *
- * @param dev           The device.
- * @param class         The class.
- * @param base_dev_name The base name of the device within the class if
- *                      specified by the driver, NULL otherwise.
- * @return              dev_class_info_t structure which associates the device
- *                      with the class.
- */
-dev_class_info_t *add_function_to_class(fun_node_t *fun, dev_class_t *cl,
-    const char *base_dev_name)
-{
-        dev_class_info_t *info;
-
-        assert(fun != NULL);
-        assert(cl != NULL);
-
-        info = create_dev_class_info();
-
-        
-        if (info != NULL) {
-                info->dev_class = cl;
-                info->fun = fun;
-                
-                /* Add the device to the class. */
-                fibril_mutex_lock(&cl->mutex);
-                list_append(&info->link, &cl->devices);
-                fibril_mutex_unlock(&cl->mutex);
-                
-                /* Add the class to the device. */
-                list_append(&info->dev_classes, &fun->classes);
-                
-                /* Create unique name for the device within the class. */
-                info->dev_name = create_dev_name_for_class(cl, base_dev_name);
-        }
-        
-        return info;
-}
-
-dev_class_t *get_dev_class(class_list_t *class_list, char *class_name)
-{
-        dev_class_t *cl;
-        
-        fibril_rwlock_write_lock(&class_list->rwlock);
-        cl = find_dev_class_no_lock(class_list, class_name);
-        if (cl == NULL) {
-                cl = create_dev_class();
-                if (cl != NULL) {
-                        cl->name = class_name;
-                        cl->base_dev_name = "";
-                        add_dev_class_no_lock(class_list, cl);
-                }
-        }
-
-        fibril_rwlock_write_unlock(&class_list->rwlock);
-        return cl;
-}
-
-dev_class_t *find_dev_class_no_lock(class_list_t *class_list,
-    const char *class_name)
-{
-        dev_class_t *cl;
-        link_t *link = class_list->classes.next;
-        
-        while (link != &class_list->classes) {
-                cl = list_get_instance(link, dev_class_t, link);
-                if (str_cmp(cl->name, class_name) == 0) {
-                        return cl;
-                }
-                link = link->next;
-        }
-        
-        return NULL;
-}
-
-void add_dev_class_no_lock(class_list_t *class_list, dev_class_t *cl)
-{
-        list_append(&cl->link, &class_list->classes);
-}
-
-dev_class_info_t *find_dev_in_class(dev_class_t *dev_class, const char *dev_name)
-{
-        assert(dev_class != NULL);
-        assert(dev_name != NULL);
-
-        link_t *link;
-        for (link = dev_class->devices.next;
-            link != &dev_class->devices;
-            link = link->next) {
-                dev_class_info_t *dev = list_get_instance(link,
-                    dev_class_info_t, link);
-
-                if (str_cmp(dev->dev_name, dev_name) == 0) {
-                        return dev;
-                }
-        }
-
-        return NULL;
-}
-
-void init_class_list(class_list_t *class_list)
-{
-        list_initialize(&class_list->classes);
-        fibril_rwlock_initialize(&class_list->rwlock);
-        hash_table_create(&class_list->devmap_functions, DEVICE_BUCKETS, 1,
-            &devmap_devices_class_ops);
-}
-
-
-/* Devmap devices */
-
-fun_node_t *find_devmap_tree_function(dev_tree_t *tree, devmap_handle_t devmap_handle)
+static fun_node_t *find_node_child(dev_tree_t *tree, fun_node_t *pfun,
+    const char *name)
+{
+        return find_fun_node_in_device(tree, pfun->child, name);
+}
+
+/* loc devices */
+
+fun_node_t *find_loc_tree_function(dev_tree_t *tree, service_id_t service_id)
 {
         fun_node_t *fun = NULL;
         link_t *link;
-        unsigned long key = (unsigned long) devmap_handle;
+        unsigned long key = (unsigned long) service_id;
         
         fibril_rwlock_read_lock(&tree->rwlock);
-        link = hash_table_find(&tree->devmap_functions, &key);
-        if (link != NULL)
-                fun = hash_table_get_instance(link, fun_node_t, devmap_fun);
+        link = hash_table_find(&tree->loc_functions, &key);
+        if (link != NULL) {
+                fun = hash_table_get_instance(link, fun_node_t, loc_fun);
+                fun_add_ref(fun);
+        }
         fibril_rwlock_read_unlock(&tree->rwlock);
         
@@ -1449 +1469 @@
 }
 
-fun_node_t *find_devmap_class_function(class_list_t *classes,
-    devmap_handle_t devmap_handle)
-{
-        fun_node_t *fun = NULL;
-        dev_class_info_t *cli;
-        link_t *link;
-        unsigned long key = (unsigned long)devmap_handle;
-        
-        fibril_rwlock_read_lock(&classes->rwlock);
-        link = hash_table_find(&classes->devmap_functions, &key);
-        if (link != NULL) {
-                cli = hash_table_get_instance(link, dev_class_info_t,
-                    devmap_link);
-                fun = cli->fun;
-        }
-        fibril_rwlock_read_unlock(&classes->rwlock);
-        
-        return fun;
-}
-
-void class_add_devmap_function(class_list_t *class_list, dev_class_info_t *cli)
-{
-        unsigned long key = (unsigned long) cli->devmap_handle;
-        
-        fibril_rwlock_write_lock(&class_list->rwlock);
-        hash_table_insert(&class_list->devmap_functions, &key, &cli->devmap_link);
-        fibril_rwlock_write_unlock(&class_list->rwlock);
-
-        assert(find_devmap_class_function(class_list, cli->devmap_handle) != NULL);
-}
-
-void tree_add_devmap_function(dev_tree_t *tree, fun_node_t *fun)
-{
-        unsigned long key = (unsigned long) fun->devmap_handle;
-        fibril_rwlock_write_lock(&tree->rwlock);
-        hash_table_insert(&tree->devmap_functions, &key, &fun->devmap_fun);
-        fibril_rwlock_write_unlock(&tree->rwlock);
+void tree_add_loc_function(dev_tree_t *tree, fun_node_t *fun)
+{
+        assert(fibril_rwlock_is_write_locked(&tree->rwlock));
+        
+        unsigned long key = (unsigned long) fun->service_id;
+        hash_table_insert(&tree->loc_functions, &key, &fun->loc_fun);
 }