source: mainline/uspace/srv/devman/client_conn.c@ 889cdb1

/*
 * Copyright (c) 2010 Lenka Trochtova
 * Copyright (c) 2013 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @addtogroup devman
 * @{
 */

/** @file
 */

#include <inttypes.h>
#include <assert.h>
#include <ns.h>
#include <async.h>
#include <stdio.h>
#include <errno.h>
#include <str_error.h>
#include <stdbool.h>
#include <fibril_synch.h>
#include <stdlib.h>
#include <str.h>
#include <ctype.h>
#include <ipc/devman.h>

#include "client_conn.h"
#include "dev.h"
#include "devman.h"
#include "driver.h"
#include "fun.h"
#include "loc.h"
#include "main.h"

/** Find handle for the device instance identified by the device's path in the
 * device tree.
 */
static void devman_function_get_handle(ipc_call_t *icall)
{
        char *pathname;
        devman_handle_t handle;

        errno_t rc = async_data_write_accept((void **) &pathname, true, 0, 0, 0, 0);
        if (rc != EOK) {
                async_answer_0(icall, rc);
                return;
        }

        fun_node_t *fun = find_fun_node_by_path(&device_tree, pathname);

        free(pathname);

        if (fun == NULL) {
                async_answer_0(icall, ENOENT);
                return;
        }

        fibril_rwlock_read_lock(&device_tree.rwlock);

        /* Check function state */
        if (fun->state == FUN_REMOVED) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                async_answer_0(icall, ENOENT);
                return;
        }
        handle = fun->handle;

        fibril_rwlock_read_unlock(&device_tree.rwlock);

        /* Delete reference created above by find_fun_node_by_path() */
        fun_del_ref(fun);

        async_answer_1(icall, EOK, handle);
}

/** Get device match ID. */
static void devman_fun_get_match_id(ipc_call_t *icall)
{
        devman_handle_t handle = IPC_GET_ARG1(*icall);
        size_t index = IPC_GET_ARG2(*icall);
        void *buffer = NULL;

        fun_node_t *fun = find_fun_node(&device_tree, handle);
        if (fun == NULL) {
                async_answer_0(icall, ENOMEM);
                return;
        }

        ipc_call_t data;
        size_t data_len;
        if (!async_data_read_receive(&data, &data_len)) {
                async_answer_0(icall, EINVAL);
                fun_del_ref(fun);
                return;
        }

        buffer = malloc(data_len);
        if (buffer == NULL) {
                async_answer_0(&data, ENOMEM);
                async_answer_0(icall, ENOMEM);
                fun_del_ref(fun);
                return;
        }

        fibril_rwlock_read_lock(&device_tree.rwlock);

        /* Check function state */
        if (fun->state == FUN_REMOVED)
                goto error;

        link_t *link = list_nth(&fun->match_ids.ids, index);
        if (link == NULL)
                goto error;

        match_id_t *mid = list_get_instance(link, match_id_t, link);

        size_t sent_length = str_size(mid->id);
        if (sent_length > data_len) {
                sent_length = data_len;
        }

        async_data_read_finalize(&data, mid->id, sent_length);
        async_answer_1(icall, EOK, mid->score);

        fibril_rwlock_read_unlock(&device_tree.rwlock);
        fun_del_ref(fun);
        free(buffer);

        return;
error:
        fibril_rwlock_read_unlock(&device_tree.rwlock);
        free(buffer);

        async_answer_0(&data, ENOENT);
        async_answer_0(icall, ENOENT);
        fun_del_ref(fun);
}

/** Get device name. */
static void devman_fun_get_name(ipc_call_t *icall)
{
        devman_handle_t handle = IPC_GET_ARG1(*icall);

        fun_node_t *fun = find_fun_node(&device_tree, handle);
        if (fun == NULL) {
                async_answer_0(icall, ENOMEM);
                return;
        }

        ipc_call_t data;
        size_t data_len;
        if (!async_data_read_receive(&data, &data_len)) {
                async_answer_0(icall, EINVAL);
                fun_del_ref(fun);
                return;
        }

        void *buffer = malloc(data_len);
        if (buffer == NULL) {
                async_answer_0(&data, ENOMEM);
                async_answer_0(icall, ENOMEM);
                fun_del_ref(fun);
                return;
        }

        fibril_rwlock_read_lock(&device_tree.rwlock);

        /* Check function state */
        if (fun->state == FUN_REMOVED) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                free(buffer);

                async_answer_0(&data, ENOENT);
                async_answer_0(icall, ENOENT);
                fun_del_ref(fun);
                return;
        }

        size_t sent_length = str_size(fun->name);
        if (sent_length > data_len) {
                sent_length = data_len;
        }

        async_data_read_finalize(&data, fun->name, sent_length);
        async_answer_0(icall, EOK);

        fibril_rwlock_read_unlock(&device_tree.rwlock);
        fun_del_ref(fun);
        free(buffer);
}

/** Get function driver name. */
static void devman_fun_get_driver_name(ipc_call_t *icall)
{
        devman_handle_t handle = IPC_GET_ARG1(*icall);

        fun_node_t *fun = find_fun_node(&device_tree, handle);
        if (fun == NULL) {
                async_answer_0(icall, ENOMEM);
                return;
        }

        ipc_call_t data;
        size_t data_len;
        if (!async_data_read_receive(&data, &data_len)) {
                async_answer_0(icall, EINVAL);
                fun_del_ref(fun);
                return;
        }

        void *buffer = malloc(data_len);
        if (buffer == NULL) {
                async_answer_0(&data, ENOMEM);
                async_answer_0(icall, ENOMEM);
                fun_del_ref(fun);
                return;
        }

        fibril_rwlock_read_lock(&device_tree.rwlock);

        /* Check function state */
        if (fun->state == FUN_REMOVED) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                free(buffer);

                async_answer_0(&data, ENOENT);
                async_answer_0(icall, ENOENT);
                fun_del_ref(fun);
                return;
        }

        /* Check whether function has a driver */
        if (fun->child == NULL || fun->child->drv == NULL) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                free(buffer);

                async_answer_0(&data, EINVAL);
                async_answer_0(icall, EINVAL);
                fun_del_ref(fun);
                return;
        }

        size_t sent_length = str_size(fun->child->drv->name);
        if (sent_length > data_len) {
                sent_length = data_len;
        }

        async_data_read_finalize(&data, fun->child->drv->name,
            sent_length);
        async_answer_0(icall, EOK);

        fibril_rwlock_read_unlock(&device_tree.rwlock);
        fun_del_ref(fun);
        free(buffer);
}

/** Get device path. */
static void devman_fun_get_path(ipc_call_t *icall)
{
        devman_handle_t handle = IPC_GET_ARG1(*icall);

        fun_node_t *fun = find_fun_node(&device_tree, handle);
        if (fun == NULL) {
                async_answer_0(icall, ENOMEM);
                return;
        }

        ipc_call_t data;
        size_t data_len;
        if (!async_data_read_receive(&data, &data_len)) {
                async_answer_0(icall, EINVAL);
                fun_del_ref(fun);
                return;
        }

        void *buffer = malloc(data_len);
        if (buffer == NULL) {
                async_answer_0(&data, ENOMEM);
                async_answer_0(icall, ENOMEM);
                fun_del_ref(fun);
                return;
        }

        fibril_rwlock_read_lock(&device_tree.rwlock);

        /* Check function state */
        if (fun->state == FUN_REMOVED) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                free(buffer);

                async_answer_0(&data, ENOENT);
                async_answer_0(icall, ENOENT);
                fun_del_ref(fun);
                return;
        }

        size_t sent_length = str_size(fun->pathname);
        if (sent_length > data_len) {
                sent_length = data_len;
        }

        async_data_read_finalize(&data, fun->pathname, sent_length);
        async_answer_0(icall, EOK);

        fibril_rwlock_read_unlock(&device_tree.rwlock);
        fun_del_ref(fun);
        free(buffer);
}

/** Get handle for parent function of a device. */
static void devman_dev_get_parent(ipc_call_t *icall)
{
        dev_node_t *dev;

        fibril_rwlock_read_lock(&device_tree.rwlock);

        dev = find_dev_node_no_lock(&device_tree, IPC_GET_ARG1(*icall));
        if (dev == NULL || dev->state == DEVICE_REMOVED) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                async_answer_0(icall, ENOENT);
                return;
        }

        if (dev->pfun == NULL) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                async_answer_0(icall, ENOENT);
                return;
        }

        async_answer_1(icall, EOK, dev->pfun->handle);

        fibril_rwlock_read_unlock(&device_tree.rwlock);
}

static void devman_dev_get_functions(ipc_call_t *icall)
{
        ipc_call_t call;
        size_t size;
        size_t act_size;
        errno_t rc;

        if (!async_data_read_receive(&call, &size)) {
                async_answer_0(&call, EREFUSED);
                async_answer_0(icall, EREFUSED);
                return;
        }

        fibril_rwlock_read_lock(&device_tree.rwlock);

        dev_node_t *dev = find_dev_node_no_lock(&device_tree,
            IPC_GET_ARG1(*icall));
        if (dev == NULL || dev->state == DEVICE_REMOVED) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                async_answer_0(&call, ENOENT);
                async_answer_0(icall, ENOENT);
                return;
        }

        devman_handle_t *hdl_buf = (devman_handle_t *) malloc(size);
        if (hdl_buf == NULL) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                async_answer_0(&call, ENOMEM);
                async_answer_0(icall, ENOMEM);
                return;
        }

        rc = dev_get_functions(&device_tree, dev, hdl_buf, size, &act_size);
        if (rc != EOK) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                async_answer_0(&call, rc);
                async_answer_0(icall, rc);
                return;
        }

        fibril_rwlock_read_unlock(&device_tree.rwlock);

        errno_t retval = async_data_read_finalize(&call, hdl_buf, size);
        free(hdl_buf);

        async_answer_1(icall, retval, act_size);
}

/** Get handle for child device of a function. */
static void devman_fun_get_child(ipc_call_t *icall)
{
        fun_node_t *fun;

        fibril_rwlock_read_lock(&device_tree.rwlock);

        fun = find_fun_node_no_lock(&device_tree, IPC_GET_ARG1(*icall));
        if (fun == NULL || fun->state == FUN_REMOVED) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                async_answer_0(icall, ENOENT);
                return;
        }

        if (fun->child == NULL) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                async_answer_0(icall, ENOENT);
                return;
        }

        async_answer_1(icall, EOK, fun->child->handle);

        fibril_rwlock_read_unlock(&device_tree.rwlock);
}

/** Online function.
 *
 * Send a request to online a function to the responsible driver.
 * The driver may offline other functions if necessary (i.e. if the state
 * of this function is linked to state of another function somehow).
 */
static void devman_fun_online(ipc_call_t *icall)
{
        fun_node_t *fun;
        errno_t rc;

        fun = find_fun_node(&device_tree, IPC_GET_ARG1(*icall));
        if (fun == NULL) {
                async_answer_0(icall, ENOENT);
                return;
        }

        rc = driver_fun_online(&device_tree, fun);
        fun_del_ref(fun);

        async_answer_0(icall, rc);
}

/** Offline function.
 *
 * Send a request to offline a function to the responsible driver. As
 * a result the subtree rooted at that function should be cleanly
 * detatched. The driver may offline other functions if necessary
 * (i.e. if the state of this function is linked to state of another
 * function somehow).
 */
static void devman_fun_offline(ipc_call_t *icall)
{
        fun_node_t *fun;
        errno_t rc;

        fun = find_fun_node(&device_tree, IPC_GET_ARG1(*icall));
        if (fun == NULL) {
                async_answer_0(icall, ENOENT);
                return;
        }

        rc = driver_fun_offline(&device_tree, fun);
        fun_del_ref(fun);

        async_answer_0(icall, rc);
}

/** Find handle for the function instance identified by its service ID. */
static void devman_fun_sid_to_handle(ipc_call_t *icall)
{
        fun_node_t *fun;

        fun = find_loc_tree_function(&device_tree, IPC_GET_ARG1(*icall));

        if (fun == NULL) {
                async_answer_0(icall, ENOENT);
                return;
        }

        fibril_rwlock_read_lock(&device_tree.rwlock);

        /* Check function state */
        if (fun->state == FUN_REMOVED) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                async_answer_0(icall, ENOENT);
                return;
        }

        async_answer_1(icall, EOK, fun->handle);
        fibril_rwlock_read_unlock(&device_tree.rwlock);
        fun_del_ref(fun);
}

/** Get list of all registered drivers. */
static void devman_get_drivers(ipc_call_t *icall)
{
        ipc_call_t call;
        size_t size;
        size_t act_size;
        errno_t rc;

        if (!async_data_read_receive(&call, &size)) {
                async_answer_0(icall, EREFUSED);
                return;
        }

        devman_handle_t *hdl_buf = (devman_handle_t *) malloc(size);
        if (hdl_buf == NULL) {
                async_answer_0(&call, ENOMEM);
                async_answer_0(icall, ENOMEM);
                return;
        }

        rc = driver_get_list(&drivers_list, hdl_buf, size, &act_size);
        if (rc != EOK) {
                async_answer_0(&call, rc);
                async_answer_0(icall, rc);
                return;
        }

        errno_t retval = async_data_read_finalize(&call, hdl_buf, size);
        free(hdl_buf);

        async_answer_1(icall, retval, act_size);
}

static void devman_driver_get_devices(ipc_call_t *icall)
{
        ipc_call_t call;
        size_t size;
        size_t act_size;
        errno_t rc;

        if (!async_data_read_receive(&call, &size)) {
                async_answer_0(icall, EREFUSED);
                return;
        }

        driver_t *drv = driver_find(&drivers_list, IPC_GET_ARG1(*icall));
        if (drv == NULL) {
                async_answer_0(&call, ENOENT);
                async_answer_0(icall, ENOENT);
                return;
        }

        devman_handle_t *hdl_buf = (devman_handle_t *) malloc(size);
        if (hdl_buf == NULL) {
                async_answer_0(&call, ENOMEM);
                async_answer_0(icall, ENOMEM);
                return;
        }

        rc = driver_get_devices(drv, hdl_buf, size, &act_size);
        if (rc != EOK) {
                fibril_rwlock_read_unlock(&device_tree.rwlock);
                async_answer_0(&call, rc);
                async_answer_0(icall, rc);
                return;
        }

        errno_t retval = async_data_read_finalize(&call, hdl_buf, size);
        free(hdl_buf);

        async_answer_1(icall, retval, act_size);
}

/** Find driver by name. */
static void devman_driver_get_handle(ipc_call_t *icall)
{
        char *drvname;

        errno_t rc = async_data_write_accept((void **) &drvname, true, 0, 0, 0, 0);
        if (rc != EOK) {
                async_answer_0(icall, rc);
                return;
        }

        driver_t *driver = driver_find_by_name(&drivers_list, drvname);

        free(drvname);

        if (driver == NULL) {
                async_answer_0(icall, ENOENT);
                return;
        }

        async_answer_1(icall, EOK, driver->handle);
}

/** Get driver match ID. */
static void devman_driver_get_match_id(ipc_call_t *icall)
{
        devman_handle_t handle = IPC_GET_ARG1(*icall);
        size_t index = IPC_GET_ARG2(*icall);

        driver_t *drv = driver_find(&drivers_list, handle);
        if (drv == NULL) {
                async_answer_0(icall, ENOMEM);
                return;
        }

        ipc_call_t data;
        size_t data_len;
        if (!async_data_read_receive(&data, &data_len)) {
                async_answer_0(icall, EINVAL);
                return;
        }

        void *buffer = malloc(data_len);
        if (buffer == NULL) {
                async_answer_0(&data, ENOMEM);
                async_answer_0(icall, ENOMEM);
                return;
        }

        fibril_mutex_lock(&drv->driver_mutex);
        link_t *link = list_nth(&drv->match_ids.ids, index);
        if (link == NULL) {
                fibril_mutex_unlock(&drv->driver_mutex);
                free(buffer);
                async_answer_0(&data, ENOMEM);
                async_answer_0(icall, ENOMEM);
                return;
        }

        match_id_t *mid = list_get_instance(link, match_id_t, link);

        size_t sent_length = str_size(mid->id);
        if (sent_length > data_len) {
                sent_length = data_len;
        }

        async_data_read_finalize(&data, mid->id, sent_length);
        async_answer_1(icall, EOK, mid->score);

        fibril_mutex_unlock(&drv->driver_mutex);

        free(buffer);
}

/** Get driver name. */
static void devman_driver_get_name(ipc_call_t *icall)
{
        devman_handle_t handle = IPC_GET_ARG1(*icall);

        driver_t *drv = driver_find(&drivers_list, handle);
        if (drv == NULL) {
                async_answer_0(icall, ENOMEM);
                return;
        }

        ipc_call_t data;
        size_t data_len;
        if (!async_data_read_receive(&data, &data_len)) {
                async_answer_0(icall, EINVAL);
                return;
        }

        void *buffer = malloc(data_len);
        if (buffer == NULL) {
                async_answer_0(&data, ENOMEM);
                async_answer_0(icall, ENOMEM);
                return;
        }

        fibril_mutex_lock(&drv->driver_mutex);

        size_t sent_length = str_size(drv->name);
        if (sent_length > data_len) {
                sent_length = data_len;
        }

        async_data_read_finalize(&data, drv->name, sent_length);
        async_answer_0(icall, EOK);

        fibril_mutex_unlock(&drv->driver_mutex);

        free(buffer);
}

/** Get driver state. */
static void devman_driver_get_state(ipc_call_t *icall)
{
        driver_t *drv;

        drv = driver_find(&drivers_list, IPC_GET_ARG1(*icall));
        if (drv == NULL) {
                async_answer_0(icall, ENOENT);
                return;
        }

        async_answer_1(icall, EOK, (sysarg_t) drv->state);
}

/** Forcibly load a driver. */
static void devman_driver_load(ipc_call_t *icall)
{
        driver_t *drv;
        errno_t rc;

        drv = driver_find(&drivers_list, IPC_GET_ARG1(*icall));
        if (drv == NULL) {
                async_answer_0(icall, ENOENT);
                return;
        }

        fibril_mutex_lock(&drv->driver_mutex);
        rc = start_driver(drv) ? EOK : EIO;
        fibril_mutex_unlock(&drv->driver_mutex);

        async_answer_0(icall, rc);
}

/** Unload a driver by user request. */
static void devman_driver_unload(ipc_call_t *icall)
{
        driver_t *drv;
        errno_t rc;

        drv = driver_find(&drivers_list, IPC_GET_ARG1(*icall));
        if (drv == NULL) {
                async_answer_0(icall, ENOENT);
                return;
        }

        fibril_mutex_lock(&drv->driver_mutex);
        rc = stop_driver(drv);
        fibril_mutex_unlock(&drv->driver_mutex);

        async_answer_0(icall, rc);
}

/** Function for handling connections from a client to the device manager. */
void devman_connection_client(ipc_call_t *icall, void *arg)
{
        /* Accept connection. */
        async_answer_0(icall, EOK);

        while (true) {
                ipc_call_t call;
                async_get_call(&call);

                if (!IPC_GET_IMETHOD(call)) {
                        async_answer_0(&call, EOK);
                        break;
                }

                switch (IPC_GET_IMETHOD(call)) {
                case DEVMAN_DEVICE_GET_HANDLE:
                        devman_function_get_handle(&call);
                        break;
                case DEVMAN_DEV_GET_PARENT:
                        devman_dev_get_parent(&call);
                        break;
                case DEVMAN_DEV_GET_FUNCTIONS:
                        devman_dev_get_functions(&call);
                        break;
                case DEVMAN_FUN_GET_CHILD:
                        devman_fun_get_child(&call);
                        break;
                case DEVMAN_FUN_GET_MATCH_ID:
                        devman_fun_get_match_id(&call);
                        break;
                case DEVMAN_FUN_GET_NAME:
                        devman_fun_get_name(&call);
                        break;
                case DEVMAN_FUN_GET_DRIVER_NAME:
                        devman_fun_get_driver_name(&call);
                        break;
                case DEVMAN_FUN_GET_PATH:
                        devman_fun_get_path(&call);
                        break;
                case DEVMAN_FUN_ONLINE:
                        devman_fun_online(&call);
                        break;
                case DEVMAN_FUN_OFFLINE:
                        devman_fun_offline(&call);
                        break;
                case DEVMAN_FUN_SID_TO_HANDLE:
                        devman_fun_sid_to_handle(&call);
                        break;
                case DEVMAN_GET_DRIVERS:
                        devman_get_drivers(&call);
                        break;
                case DEVMAN_DRIVER_GET_DEVICES:
                        devman_driver_get_devices(&call);
                        break;
                case DEVMAN_DRIVER_GET_HANDLE:
                        devman_driver_get_handle(&call);
                        break;
                case DEVMAN_DRIVER_GET_MATCH_ID:
                        devman_driver_get_match_id(&call);
                        break;
                case DEVMAN_DRIVER_GET_NAME:
                        devman_driver_get_name(&call);
                        break;
                case DEVMAN_DRIVER_GET_STATE:
                        devman_driver_get_state(&call);
                        break;
                case DEVMAN_DRIVER_LOAD:
                        devman_driver_load(&call);
                        break;
                case DEVMAN_DRIVER_UNLOAD:
                        devman_driver_unload(&call);
                        break;
                default:
                        async_answer_0(&call, ENOENT);
                }
        }
}

/** @}
 */