WebSVN – HelenOS – Diff – /trunk/uspace/srv/devmap/devmap.c


/*
 * Copyright (c) 2007 Josef Cejka
 * 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.
 */
 
/**
 * @defgroup devmap Device mapper.
 * @brief HelenOS device mapper.
 * @{
 */
 
/** @file
 */
 
#include <ipc/services.h>
#include <ipc/ns.h>
#include <async.h>
#include <stdio.h>
#include <errno.h>
#include <bool.h>
#include <fibril_sync.h>
#include <stdlib.h>
#include <string.h>
#include <ipc/devmap.h>
#include <assert.h>
 
#define NAME  "devmap"
 
/** Representation of device driver.
 *
 * Each driver is responsible for a set of devices.
 *
 */
typedef struct {
    /** Pointers to previous and next drivers in linked list */
    link_t drivers;
    /** Pointer to the linked list of devices controlled by this driver */
    link_t devices;
    /** Phone asociated with this driver */
    ipcarg_t phone;
    /** Device driver name */
    char *name;
    /** Fibril mutex for list of devices owned by this driver */
    fibril_mutex_t devices_mutex;
} devmap_driver_t;
 
/** Info about registered device
 *
 */
typedef struct {
    /** Pointer to the previous and next device in the list of all devices */
    link_t devices;
    /** Pointer to the previous and next device in the list of devices
        owned by one driver */
    link_t driver_devices;
    /** Unique device identifier  */
    dev_handle_t handle;
    /** Device name */
    char *name;
    /** Device driver handling this device */
    devmap_driver_t *driver;
} devmap_device_t;
 
/** Pending lookup structure. */
typedef struct {
    link_t link;
    char *name;              /**< Device name */
    ipc_callid_t callid;     /**< Call ID waiting for the lookup */
} pending_req_t;
 
LIST_INITIALIZE(devices_list);
LIST_INITIALIZE(drivers_list);
LIST_INITIALIZE(pending_req);
 
static bool pending_new_dev = false;
static FIBRIL_CONDVAR_INITIALIZE(pending_cv);
 
/* Locking order:
 *  drivers_list_mutex
 *  devices_list_mutex
 *  (devmap_driver_t *)->devices_mutex
 *  create_handle_mutex
 **/
 
static FIBRIL_MUTEX_INITIALIZE(devices_list_mutex);
static FIBRIL_MUTEX_INITIALIZE(drivers_list_mutex);
static FIBRIL_MUTEX_INITIALIZE(create_handle_mutex);
 
static dev_handle_t last_handle = 0;
 
static dev_handle_t devmap_create_handle(void)
{
    /* TODO: allow reusing old handles after their unregistration
     * and implement some version of LRU algorithm, avoid overflow
     */
   
    fibril_mutex_lock(&create_handle_mutex);
    last_handle++;
    fibril_mutex_unlock(&create_handle_mutex);
   
    return last_handle;
}
 
/** Find device with given name.
 *
 */
static devmap_device_t *devmap_device_find_name(const char *name)
{
    link_t *item = devices_list.next;
    devmap_device_t *device = NULL;
   
    while (item != &devices_list) {
        device = list_get_instance(item, devmap_device_t, devices);
        if (str_cmp(device->name, name) == 0)
            break;
        item = item->next;
    }
   
    if (item == &devices_list)
        return NULL;
   
    device = list_get_instance(item, devmap_device_t, devices);
    return device;
}
 
/** Find device with given handle.
 *
 * @todo: use hash table
 *
 */
static devmap_device_t *devmap_device_find_handle(dev_handle_t handle)
{
    fibril_mutex_lock(&devices_list_mutex);
   
    link_t *item = (&devices_list)->next;
    devmap_device_t *device = NULL;
   
    while (item != &devices_list) {
        device = list_get_instance(item, devmap_device_t, devices);
        if (device->handle == handle)
            break;
        item = item->next;
    }
   
    if (item == &devices_list) {
        fibril_mutex_unlock(&devices_list_mutex);
        return NULL;
    }
   
    device = list_get_instance(item, devmap_device_t, devices);
   
    fibril_mutex_unlock(&devices_list_mutex);
   
    return device;
}
 
/**
 
 * Unregister device and free it. It's assumed that driver's device list is
 * already locked.
 
 */
static int devmap_device_unregister_core(devmap_device_t *device)
{
    list_remove(&(device->devices));
    list_remove(&(device->driver_devices));
   
    free(device->name);
    free(device);
   
    return EOK;
}
 
/**
 
 * Read info about new driver and add it into linked list of registered
 * drivers.
 
 */
static void devmap_driver_register(devmap_driver_t **odriver)
{
    *odriver = NULL;
   
    ipc_call_t icall;
    ipc_callid_t iid = async_get_call(&icall);
   
    if (IPC_GET_METHOD(icall) != DEVMAP_DRIVER_REGISTER) {
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    devmap_driver_t *driver = (devmap_driver_t *) malloc(sizeof(devmap_driver_t));
   
    if (driver == NULL) {
        ipc_answer_0(iid, ENOMEM);
        return;
    }
   
    /*
     * Get driver name
     */
    ipc_callid_t callid;
    size_t name_size;
    if (!ipc_data_write_receive(&callid, &name_size)) {
        free(driver);
        ipc_answer_0(callid, EREFUSED);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    if (name_size > DEVMAP_NAME_MAXLEN) {
        free(driver);
        ipc_answer_0(callid, EINVAL);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    /*
     * Allocate buffer for device name.
     */
    driver->name = (char *) malloc(name_size + 1);
    if (driver->name == NULL) {
        free(driver);
        ipc_answer_0(callid, ENOMEM);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    /*
     * Send confirmation to sender and get data into buffer.
     */
    if (ipc_data_write_finalize(callid, driver->name, name_size) != EOK) {
        free(driver->name);
        free(driver);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    driver->name[name_size] = 0;
   
    /* Initialize mutex for list of devices owned by this driver */
    fibril_mutex_initialize(&driver->devices_mutex);
   
    /*
     * Initialize list of asociated devices
     */
    list_initialize(&driver->devices);
   
    /*
     * Create connection to the driver
     */
    ipc_call_t call;
    callid = async_get_call(&call);
   
    if (IPC_GET_METHOD(call) != IPC_M_CONNECT_TO_ME) {
        ipc_answer_0(callid, ENOTSUP);
       
        free(driver->name);
        free(driver);
        ipc_answer_0(iid, ENOTSUP);
        return;
    }
   
    driver->phone = IPC_GET_ARG5(call);
   
    ipc_answer_0(callid, EOK);
   
    list_initialize(&(driver->drivers));
   
    fibril_mutex_lock(&drivers_list_mutex);
   
    /* TODO:
     * check that no driver with name equal to driver->name is registered
     */
   
    /*
     * Insert new driver into list of registered drivers
     */
    list_append(&(driver->drivers), &drivers_list);
    fibril_mutex_unlock(&drivers_list_mutex);
   
    ipc_answer_0(iid, EOK);
   
    *odriver = driver;
}
 
/**
 * Unregister device driver, unregister all its devices and free driver
 * structure.
 *
 */
static int devmap_driver_unregister(devmap_driver_t *driver)
{
    if (driver == NULL)
        return EEXISTS;
   
    fibril_mutex_lock(&drivers_list_mutex);
   
    if (driver->phone != 0)
        ipc_hangup(driver->phone);
   
    /* Remove it from list of drivers */
    list_remove(&(driver->drivers));
   
    /* Unregister all its devices */
    fibril_mutex_lock(&devices_list_mutex);
    fibril_mutex_lock(&driver->devices_mutex);
   
    while (!list_empty(&(driver->devices))) {
        devmap_device_t *device = list_get_instance(driver->devices.next,
            devmap_device_t, driver_devices);
        devmap_device_unregister_core(device);
    }
   
    fibril_mutex_unlock(&driver->devices_mutex);
    fibril_mutex_unlock(&devices_list_mutex);
    fibril_mutex_unlock(&drivers_list_mutex);
   
    /* free name and driver */
    if (driver->name != NULL)
        free(driver->name);
   
    free(driver);
   
    return EOK;
}
 
 
/** Process pending lookup requests */
static void process_pending_lookup(void)
{
    link_t *cur;
 
loop:
    fibril_mutex_lock(&devices_list_mutex);
    while (!pending_new_dev)
        fibril_condvar_wait(&pending_cv, &devices_list_mutex);
rescan:
    for (cur = pending_req.next; cur != &pending_req; cur = cur->next) {
        pending_req_t *pr = list_get_instance(cur, pending_req_t, link);
       
        const devmap_device_t *dev = devmap_device_find_name(pr->name);
        if (!dev)
            continue;
       
        ipc_answer_1(pr->callid, EOK, dev->handle);
       
        free(pr->name);
        list_remove(cur);
        free(pr);
       
        goto rescan;
    }
    pending_new_dev = false;
    fibril_mutex_unlock(&devices_list_mutex);
    goto loop;
}
 
 
/** Register instance of device
 *
 */
static void devmap_device_register(ipc_callid_t iid, ipc_call_t *icall,
    devmap_driver_t *driver)
{
    if (driver == NULL) {
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    /* Create new device entry */
    devmap_device_t *device = (devmap_device_t *) malloc(sizeof(devmap_device_t));
    if (device == NULL) {
        ipc_answer_0(iid, ENOMEM);
        return;
    }
   
    /* Get device name */
    ipc_callid_t callid;
    size_t size;
    if (!ipc_data_write_receive(&callid, &size)) {
        free(device);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    if (size > DEVMAP_NAME_MAXLEN) {
        free(device);
        ipc_answer_0(callid, EINVAL);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    /* +1 for terminating \0 */
    device->name = (char *) malloc(size + 1);
   
    if (device->name == NULL) {
        free(device);
        ipc_answer_0(callid, ENOMEM);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    ipc_data_write_finalize(callid, device->name, size);
    device->name[size] = 0;
   
    list_initialize(&(device->devices));
    list_initialize(&(device->driver_devices));
   
    fibril_mutex_lock(&devices_list_mutex);
   
    /* Check that device with such name is not already registered */
    if (NULL != devmap_device_find_name(device->name)) {
        printf(NAME ": Device '%s' already registered\n", device->name);
        fibril_mutex_unlock(&devices_list_mutex);
        free(device->name);
        free(device);
        ipc_answer_0(iid, EEXISTS);
        return;
    }
   
    /* Get unique device handle */
    device->handle = devmap_create_handle();
   
    device->driver = driver;
   
    /* Insert device into list of all devices  */
    list_append(&device->devices, &devices_list);
   
    /* Insert device into list of devices that belog to one driver */
    fibril_mutex_lock(&device->driver->devices_mutex);
   
    list_append(&device->driver_devices, &device->driver->devices);
   
    fibril_mutex_unlock(&device->driver->devices_mutex);
    pending_new_dev = true;
    fibril_condvar_signal(&pending_cv);
    fibril_mutex_unlock(&devices_list_mutex);
   
    ipc_answer_1(iid, EOK, device->handle);
}
 
/**
 *
 */
static int devmap_device_unregister(ipc_callid_t iid, ipc_call_t *icall,
    devmap_driver_t *driver)
{
    /* TODO */
    return EOK;
}
 
/** Connect client to the device.
 *
 * Find device driver owning requested device and forward
 * the message to it.
 *
 */
static void devmap_forward(ipc_callid_t callid, ipc_call_t *call)
{
    /*
     * Get handle from request
     */
    dev_handle_t handle = IPC_GET_ARG2(*call);
    devmap_device_t *dev = devmap_device_find_handle(handle);
   
    if ((dev == NULL) || (dev->driver == NULL) || (dev->driver->phone == 0)) {
        ipc_answer_0(callid, ENOENT);
        return;
    }
   
    ipc_forward_fast(callid, dev->driver->phone, dev->handle,
        IPC_GET_ARG3(*call), 0, IPC_FF_NONE);
}
 
/** Find handle for device instance identified by name.
 *
 * In answer will be send EOK and device handle in arg1 or a error
 * code from errno.h.
 *
 */
static void devmap_get_handle(ipc_callid_t iid, ipc_call_t *icall)
{
    /*
     * Wait for incoming message with device name (but do not
     * read the name itself until the buffer is allocated).
     */
    ipc_callid_t callid;
    size_t size;
    if (!ipc_data_write_receive(&callid, &size)) {
        ipc_answer_0(callid, EREFUSED);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    if ((size < 1) || (size > DEVMAP_NAME_MAXLEN)) {
        ipc_answer_0(callid, EINVAL);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    /*
     * Allocate buffer for device name.
     */
    char *name = (char *) malloc(size + 1);
    if (name == NULL) {
        ipc_answer_0(callid, ENOMEM);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    /*
     * Send confirmation to sender and get data into buffer.
     */
    ipcarg_t retval = ipc_data_write_finalize(callid, name, size);
    if (retval != EOK) {
        ipc_answer_0(iid, EREFUSED);
        free(name);
        return;
    }
    name[size] = '\0';
   
    fibril_mutex_lock(&devices_list_mutex);
 
    /*
     * Find device name in linked list of known devices.
     */
    const devmap_device_t *dev = devmap_device_find_name(name);
   
    /*
     * Device was not found.
     */
    if (dev == NULL) {
        if (IPC_GET_ARG1(*icall) & IPC_FLAG_BLOCKING) {
            /* Blocking lookup, add to pending list */
            pending_req_t *pr = (pending_req_t *) malloc(sizeof(pending_req_t));
            if (!pr) {
                fibril_mutex_unlock(&devices_list_mutex);
                ipc_answer_0(iid, ENOMEM);
                free(name);
                return;
            }
           
            pr->name = name;
            pr->callid = iid;
            list_append(&pr->link, &pending_req);
            fibril_mutex_unlock(&devices_list_mutex);
            return;
        }
       
        ipc_answer_0(iid, ENOENT);
        free(name);
        fibril_mutex_unlock(&devices_list_mutex);
        return;
    }
    fibril_mutex_unlock(&devices_list_mutex);
   
    ipc_answer_1(iid, EOK, dev->handle);
    free(name);
}
 
/** Find name of device identified by id and send it to caller.
 *
 */
static void devmap_get_name(ipc_callid_t iid, ipc_call_t *icall)
{
    const devmap_device_t *device = devmap_device_find_handle(IPC_GET_ARG1(*icall));
   
    /*
     * Device not found.
     */
    if (device == NULL) {
        ipc_answer_0(iid, ENOENT);
        return;
    }
   
    ipc_answer_0(iid, EOK);
   
    size_t name_size = str_size(device->name);
   
    /* FIXME:
     * We have no channel from DEVMAP to client, therefore
     * sending must be initiated by client.
     *
     * int rc = ipc_data_write_send(phone, device->name, name_size);
     * if (rc != EOK) {
     *     async_wait_for(req, NULL);
     *     return rc;
     * }
     */
   
    /* TODO: send name in response */
}
 
static void devmap_get_count(ipc_callid_t iid, ipc_call_t *icall)
{
    fibril_mutex_lock(&devices_list_mutex);
    ipc_answer_1(iid, EOK, list_count(&devices_list));
    fibril_mutex_unlock(&devices_list_mutex);
}
 
static void devmap_get_devices(ipc_callid_t iid, ipc_call_t *icall)
{
    fibril_mutex_lock(&devices_list_mutex);
   
    ipc_callid_t callid;
    size_t size;
    if (!ipc_data_read_receive(&callid, &size)) {
        ipc_answer_0(callid, EREFUSED);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    if ((size % sizeof(dev_desc_t)) != 0) {
        ipc_answer_0(callid, EINVAL);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    size_t count = size / sizeof(dev_desc_t);
    dev_desc_t *desc = (dev_desc_t *) malloc(size);
    if (desc == NULL) {
        ipc_answer_0(callid, ENOMEM);
        ipc_answer_0(iid, EREFUSED);
        return;
    }
   
    size_t pos = 0;
    link_t *item = devices_list.next;
   
    while ((item != &devices_list) && (pos < count)) {
        devmap_device_t *device = list_get_instance(item, devmap_device_t, devices);
       
        desc[pos].handle = device->handle;
        str_cpy(desc[pos].name, DEVMAP_NAME_MAXLEN, device->name);
        pos++;
        item = item->next;
    }
   
    ipcarg_t retval = ipc_data_read_finalize(callid, desc, pos * sizeof(dev_desc_t));
    if (retval != EOK) {
        ipc_answer_0(iid, EREFUSED);
        free(desc);
        return;
    }
   
    free(desc);
   
    fibril_mutex_unlock(&devices_list_mutex);
   
    ipc_answer_1(iid, EOK, pos);
}
 
/** Initialize device mapper.
 *
 *
 */
static bool devmap_init(void)
{
    /* Create NULL device entry */
    devmap_device_t *device = (devmap_device_t *) malloc(sizeof(devmap_device_t));
    if (device == NULL)
        return false;
   
    device->name = str_dup("null");
    if (device->name == NULL) {
        free(device);
        return false;
    }
   
    list_initialize(&(device->devices));
    list_initialize(&(device->driver_devices));
   
    fibril_mutex_lock(&devices_list_mutex);
   
    /* Get unique device handle */
    device->handle = devmap_create_handle();
    device->driver = NULL;
   
    /* Insert device into list of all devices  */
    list_append(&device->devices, &devices_list);
   
    fibril_mutex_unlock(&devices_list_mutex);
   
    return true;
}
 
/** Handle connection with device driver.
 *
 */
static void devmap_connection_driver(ipc_callid_t iid, ipc_call_t *icall)
{
    /* Accept connection */
    ipc_answer_0(iid, EOK);
   
    devmap_driver_t *driver = NULL;
    devmap_driver_register(&driver);
   
    if (NULL == driver)
        return;
   
    bool cont = true;
    while (cont) {
        ipc_call_t call;
        ipc_callid_t callid = async_get_call(&call);
       
        switch (IPC_GET_METHOD(call)) {
        case IPC_M_PHONE_HUNGUP:
            cont = false;
            continue;
        case DEVMAP_DRIVER_UNREGISTER:
            if (NULL == driver)
                ipc_answer_0(callid, ENOENT);
            else
                ipc_answer_0(callid, EOK);
            break;
        case DEVMAP_DEVICE_REGISTER:
            /* Register one instance of device */
            devmap_device_register(callid, &call, driver);
            break;
        case DEVMAP_DEVICE_UNREGISTER:
            /* Remove instance of device identified by handler */
            devmap_device_unregister(callid, &call, driver);
            break;
        case DEVMAP_DEVICE_GET_HANDLE:
            devmap_get_handle(callid, &call);
            break;
        case DEVMAP_DEVICE_GET_NAME:
            devmap_get_name(callid, &call);
            break;
        default:
            if (!(callid & IPC_CALLID_NOTIFICATION))
                ipc_answer_0(callid, ENOENT);
        }
    }
   
    if (NULL != driver) {
        /*
         * Unregister the device driver and all its devices.
         */
        devmap_driver_unregister(driver);
        driver = NULL;
    }
}
 
/** Handle connection with device client.
 *
 */
static void devmap_connection_client(ipc_callid_t iid, ipc_call_t *icall)
{
    /* Accept connection */
    ipc_answer_0(iid, EOK);
   
    bool cont = true;
    while (cont) {
        ipc_call_t call;
        ipc_callid_t callid = async_get_call(&call);
       
        switch (IPC_GET_METHOD(call)) {
        case IPC_M_PHONE_HUNGUP:
            cont = false;
            continue;
        case DEVMAP_DEVICE_GET_HANDLE:
            devmap_get_handle(callid, &call);
            break;
        case DEVMAP_DEVICE_GET_NAME:
            devmap_get_name(callid, &call);
            break;
        case DEVMAP_DEVICE_GET_COUNT:
            devmap_get_count(callid, &call);
            break;
        case DEVMAP_DEVICE_GET_DEVICES:
            devmap_get_devices(callid, &call);
            break;
        default:
            if (!(callid & IPC_CALLID_NOTIFICATION))
                ipc_answer_0(callid, ENOENT);
        }
    }
}
 
/** Function for handling connections to devmap
 *
 */
static void devmap_connection(ipc_callid_t iid, ipc_call_t *icall)
{
    /* Select interface */
    switch ((ipcarg_t) (IPC_GET_ARG1(*icall))) {
    case DEVMAP_DRIVER:
        devmap_connection_driver(iid, icall);
        break;
    case DEVMAP_CLIENT:
        devmap_connection_client(iid, icall);
        break;
    case DEVMAP_CONNECT_TO_DEVICE:
        /* Connect client to selected device */
        devmap_forward(iid, icall);
        break;
    default:
        /* No such interface */
        ipc_answer_0(iid, ENOENT);
    }
}
 
/**
 *
 */
int main(int argc, char *argv[])
{
    printf(NAME ": HelenOS Device Mapper\n");
   
    if (!devmap_init()) {
        printf(NAME ": Error while initializing service\n");
        return -1;
    }
   
    /* Set a handler of incomming connections */
 
 
    async_set_client_connection(devmap_connection);
 
    /* Create a fibril for handling pending device lookups */
    fid_t fid = fibril_create(process_pending_lookup, NULL);
    assert(fid);
    fibril_add_ready(fid);
   
    /* Register device mapper at naming service */
    ipcarg_t phonead;
    if (ipc_connect_to_me(PHONE_NS, SERVICE_DEVMAP, 0, 0, &phonead) != 0)
        return -1;
   
    printf(NAME ": Accepting connections\n");
    async_manager();
   
    /* Never reached */
    return 0;
}
 
/**
 * @}
 */
 

Rev 4524	Rev 4540
1	/*	1	/*
2	* Copyright (c) 2007 Josef Cejka	2	* Copyright (c) 2007 Josef Cejka
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/**	29	/**
30	* @defgroup devmap Device mapper.	30	* @defgroup devmap Device mapper.
31	* @brief HelenOS device mapper.	31	* @brief HelenOS device mapper.
32	* @{	32	* @{
33	*/	33	*/
34		34
35	/** @file	35	/** @file
36	*/	36	*/
37		37
38	#include <ipc/services.h>	38	#include <ipc/services.h>
39	#include <ipc/ns.h>	39	#include <ipc/ns.h>
40	#include <async.h>	40	#include <async.h>
41	#include <stdio.h>	41	#include <stdio.h>
42	#include <errno.h>	42	#include <errno.h>
43	#include <bool.h>	43	#include <bool.h>
44	#include <fibril_sync.h>	44	#include <fibril_sync.h>
45	#include <stdlib.h>	45	#include <stdlib.h>
46	#include <string.h>	46	#include <string.h>
47	#include <ipc/devmap.h>	47	#include <ipc/devmap.h>
-		48	#include <assert.h>
48		49
49	#define NAME "devmap"	50	#define NAME "devmap"
50		51
51	/** Representation of device driver.	52	/** Representation of device driver.
52	*	53	*
53	* Each driver is responsible for a set of devices.	54	* Each driver is responsible for a set of devices.
54	*	55	*
55	*/	56	*/
56	typedef struct {	57	typedef struct {
57	/** Pointers to previous and next drivers in linked list */	58	/** Pointers to previous and next drivers in linked list */
58	link_t drivers;	59	link_t drivers;
59	/** Pointer to the linked list of devices controlled by this driver */	60	/** Pointer to the linked list of devices controlled by this driver */
60	link_t devices;	61	link_t devices;
61	/** Phone asociated with this driver */	62	/** Phone asociated with this driver */
62	ipcarg_t phone;	63	ipcarg_t phone;
63	/** Device driver name */	64	/** Device driver name */
64	char *name;	65	char *name;
65	/** Fibril mutex for list of devices owned by this driver */	66	/** Fibril mutex for list of devices owned by this driver */
66	fibril_mutex_t devices_mutex;	67	fibril_mutex_t devices_mutex;
67	} devmap_driver_t;	68	} devmap_driver_t;
68		69
69	/** Info about registered device	70	/** Info about registered device
70	*	71	*
71	*/	72	*/
72	typedef struct {	73	typedef struct {
73	/** Pointer to the previous and next device in the list of all devices */	74	/** Pointer to the previous and next device in the list of all devices */
74	link_t devices;	75	link_t devices;
75	/** Pointer to the previous and next device in the list of devices	76	/** Pointer to the previous and next device in the list of devices
76	owned by one driver */	77	owned by one driver */
77	link_t driver_devices;	78	link_t driver_devices;
78	/** Unique device identifier */	79	/** Unique device identifier */
79	dev_handle_t handle;	80	dev_handle_t handle;
80	/** Device name */	81	/** Device name */
81	char *name;	82	char *name;
82	/** Device driver handling this device */	83	/** Device driver handling this device */
83	devmap_driver_t *driver;	84	devmap_driver_t *driver;
84	} devmap_device_t;	85	} devmap_device_t;
85		86
86	/** Pending lookup structure. */	87	/** Pending lookup structure. */
87	typedef struct {	88	typedef struct {
88	link_t link;	89	link_t link;
89	char name; /< Device name /	90	char name; /< Device name /
90	ipc_callid_t callid; /*< Call ID waiting for the lookup /	91	ipc_callid_t callid; /*< Call ID waiting for the lookup /
91	} pending_req_t;	92	} pending_req_t;
92		93
93	LIST_INITIALIZE(devices_list);	94	LIST_INITIALIZE(devices_list);
94	LIST_INITIALIZE(drivers_list);	95	LIST_INITIALIZE(drivers_list);
95	LIST_INITIALIZE(pending_req);	96	LIST_INITIALIZE(pending_req);
96		97
-		98	static bool pending_new_dev = false;
-		99	static FIBRIL_CONDVAR_INITIALIZE(pending_cv);
-		100
97	/* Locking order:	101	/* Locking order:
98	* drivers_list_mutex	102	* drivers_list_mutex
99	* devices_list_mutex	103	* devices_list_mutex
100	* (devmap_driver_t *)->devices_mutex	104	* (devmap_driver_t *)->devices_mutex
101	* create_handle_mutex	105	* create_handle_mutex
102	**/	106	**/
103		107
104	static FIBRIL_MUTEX_INITIALIZE(devices_list_mutex);	108	static FIBRIL_MUTEX_INITIALIZE(devices_list_mutex);
105	static FIBRIL_MUTEX_INITIALIZE(drivers_list_mutex);	109	static FIBRIL_MUTEX_INITIALIZE(drivers_list_mutex);
106	static FIBRIL_MUTEX_INITIALIZE(create_handle_mutex);	110	static FIBRIL_MUTEX_INITIALIZE(create_handle_mutex);
107		111
108	static dev_handle_t last_handle = 0;	112	static dev_handle_t last_handle = 0;
109		113
110	static dev_handle_t devmap_create_handle(void)	114	static dev_handle_t devmap_create_handle(void)
111	{	115	{
112	/* TODO: allow reusing old handles after their unregistration	116	/* TODO: allow reusing old handles after their unregistration
113	* and implement some version of LRU algorithm, avoid overflow	117	* and implement some version of LRU algorithm, avoid overflow
114	*/	118	*/
115		119
116	fibril_mutex_lock(&create_handle_mutex);	120	fibril_mutex_lock(&create_handle_mutex);
117	last_handle++;	121	last_handle++;
118	fibril_mutex_unlock(&create_handle_mutex);	122	fibril_mutex_unlock(&create_handle_mutex);
119		123
120	return last_handle;	124	return last_handle;
121	}	125	}
122		126
123	/** Find device with given name.	127	/** Find device with given name.
124	*	128	*
125	*/	129	*/
126	static devmap_device_t devmap_device_find_name(const char name)	130	static devmap_device_t devmap_device_find_name(const char name)
127	{	131	{
128	link_t *item = devices_list.next;	132	link_t *item = devices_list.next;
129	devmap_device_t *device = NULL;	133	devmap_device_t *device = NULL;
130		134
131	while (item != &devices_list) {	135	while (item != &devices_list) {
132	device = list_get_instance(item, devmap_device_t, devices);	136	device = list_get_instance(item, devmap_device_t, devices);
133	if (str_cmp(device->name, name) == 0)	137	if (str_cmp(device->name, name) == 0)
134	break;	138	break;
135	item = item->next;	139	item = item->next;
136	}	140	}
137		141
138	if (item == &devices_list)	142	if (item == &devices_list)
139	return NULL;	143	return NULL;
140		144
141	device = list_get_instance(item, devmap_device_t, devices);	145	device = list_get_instance(item, devmap_device_t, devices);
142	return device;	146	return device;
143	}	147	}
144		148
145	/** Find device with given handle.	149	/** Find device with given handle.
146	*	150	*
147	* @todo: use hash table	151	* @todo: use hash table
148	*	152	*
149	*/	153	*/
150	static devmap_device_t *devmap_device_find_handle(dev_handle_t handle)	154	static devmap_device_t *devmap_device_find_handle(dev_handle_t handle)
151	{	155	{
152	fibril_mutex_lock(&devices_list_mutex);	156	fibril_mutex_lock(&devices_list_mutex);
153		157
154	link_t *item = (&devices_list)->next;	158	link_t *item = (&devices_list)->next;
155	devmap_device_t *device = NULL;	159	devmap_device_t *device = NULL;
156		160
157	while (item != &devices_list) {	161	while (item != &devices_list) {
158	device = list_get_instance(item, devmap_device_t, devices);	162	device = list_get_instance(item, devmap_device_t, devices);
159	if (device->handle == handle)	163	if (device->handle == handle)
160	break;	164	break;
161	item = item->next;	165	item = item->next;
162	}	166	}
163		167
164	if (item == &devices_list) {	168	if (item == &devices_list) {
165	fibril_mutex_unlock(&devices_list_mutex);	169	fibril_mutex_unlock(&devices_list_mutex);
166	return NULL;	170	return NULL;
167	}	171	}
168		172
169	device = list_get_instance(item, devmap_device_t, devices);	173	device = list_get_instance(item, devmap_device_t, devices);
170		174
171	fibril_mutex_unlock(&devices_list_mutex);	175	fibril_mutex_unlock(&devices_list_mutex);
172		176
173	return device;	177	return device;
174	}	178	}
175		179
176	/**	180	/**
177	*	-
178	* Unregister device and free it. It's assumed that driver's device list is	181	* Unregister device and free it. It's assumed that driver's device list is
179	* already locked.	182	* already locked.
180	*	-
181	*/	183	*/
182	static int devmap_device_unregister_core(devmap_device_t *device)	184	static int devmap_device_unregister_core(devmap_device_t *device)
183	{	185	{
184	list_remove(&(device->devices));	186	list_remove(&(device->devices));
185	list_remove(&(device->driver_devices));	187	list_remove(&(device->driver_devices));
186		188
187	free(device->name);	189	free(device->name);
188	free(device);	190	free(device);
189		191
190	return EOK;	192	return EOK;
191	}	193	}
192		194
193	/**	195	/**
194	*	-
195	* Read info about new driver and add it into linked list of registered	196	* Read info about new driver and add it into linked list of registered
196	* drivers.	197	* drivers.
197	*	-
198	*/	198	*/
199	static void devmap_driver_register(devmap_driver_t **odriver)	199	static void devmap_driver_register(devmap_driver_t **odriver)
200	{	200	{
201	*odriver = NULL;	201	*odriver = NULL;
202		202
203	ipc_call_t icall;	203	ipc_call_t icall;
204	ipc_callid_t iid = async_get_call(&icall);	204	ipc_callid_t iid = async_get_call(&icall);
205		205
206	if (IPC_GET_METHOD(icall) != DEVMAP_DRIVER_REGISTER) {	206	if (IPC_GET_METHOD(icall) != DEVMAP_DRIVER_REGISTER) {
207	ipc_answer_0(iid, EREFUSED);	207	ipc_answer_0(iid, EREFUSED);
208	return;	208	return;
209	}	209	}
210		210
211	devmap_driver_t driver = (devmap_driver_t ) malloc(sizeof(devmap_driver_t));	211	devmap_driver_t driver = (devmap_driver_t ) malloc(sizeof(devmap_driver_t));
212		212
213	if (driver == NULL) {	213	if (driver == NULL) {
214	ipc_answer_0(iid, ENOMEM);	214	ipc_answer_0(iid, ENOMEM);
215	return;	215	return;
216	}	216	}
217		217
218	/*	218	/*
219	* Get driver name	219	* Get driver name
220	*/	220	*/
221	ipc_callid_t callid;	221	ipc_callid_t callid;
222	size_t name_size;	222	size_t name_size;
223	if (!ipc_data_write_receive(&callid, &name_size)) {	223	if (!ipc_data_write_receive(&callid, &name_size)) {
224	free(driver);	224	free(driver);
225	ipc_answer_0(callid, EREFUSED);	225	ipc_answer_0(callid, EREFUSED);
226	ipc_answer_0(iid, EREFUSED);	226	ipc_answer_0(iid, EREFUSED);
227	return;	227	return;
228	}	228	}
229		229
230	if (name_size > DEVMAP_NAME_MAXLEN) {	230	if (name_size > DEVMAP_NAME_MAXLEN) {
231	free(driver);	231	free(driver);
232	ipc_answer_0(callid, EINVAL);	232	ipc_answer_0(callid, EINVAL);
233	ipc_answer_0(iid, EREFUSED);	233	ipc_answer_0(iid, EREFUSED);
234	return;	234	return;
235	}	235	}
236		236
237	/*	237	/*
238	* Allocate buffer for device name.	238	* Allocate buffer for device name.
239	*/	239	*/
240	driver->name = (char *) malloc(name_size + 1);	240	driver->name = (char *) malloc(name_size + 1);
241	if (driver->name == NULL) {	241	if (driver->name == NULL) {
242	free(driver);	242	free(driver);
243	ipc_answer_0(callid, ENOMEM);	243	ipc_answer_0(callid, ENOMEM);
244	ipc_answer_0(iid, EREFUSED);	244	ipc_answer_0(iid, EREFUSED);
245	return;	245	return;
246	}	246	}
247		247
248	/*	248	/*
249	* Send confirmation to sender and get data into buffer.	249	* Send confirmation to sender and get data into buffer.
250	*/	250	*/
251	if (ipc_data_write_finalize(callid, driver->name, name_size) != EOK) {	251	if (ipc_data_write_finalize(callid, driver->name, name_size) != EOK) {
252	free(driver->name);	252	free(driver->name);
253	free(driver);	253	free(driver);
254	ipc_answer_0(iid, EREFUSED);	254	ipc_answer_0(iid, EREFUSED);
255	return;	255	return;
256	}	256	}
257		257
258	driver->name[name_size] = 0;	258	driver->name[name_size] = 0;
259		259
260	/* Initialize mutex for list of devices owned by this driver */	260	/* Initialize mutex for list of devices owned by this driver */
261	fibril_mutex_initialize(&driver->devices_mutex);	261	fibril_mutex_initialize(&driver->devices_mutex);
262		262
263	/*	263	/*
264	* Initialize list of asociated devices	264	* Initialize list of asociated devices
265	*/	265	*/
266	list_initialize(&driver->devices);	266	list_initialize(&driver->devices);
267		267
268	/*	268	/*
269	* Create connection to the driver	269	* Create connection to the driver
270	*/	270	*/
271	ipc_call_t call;	271	ipc_call_t call;
272	callid = async_get_call(&call);	272	callid = async_get_call(&call);
273		273
274	if (IPC_GET_METHOD(call) != IPC_M_CONNECT_TO_ME) {	274	if (IPC_GET_METHOD(call) != IPC_M_CONNECT_TO_ME) {
275	ipc_answer_0(callid, ENOTSUP);	275	ipc_answer_0(callid, ENOTSUP);
276		276
277	free(driver->name);	277	free(driver->name);
278	free(driver);	278	free(driver);
279	ipc_answer_0(iid, ENOTSUP);	279	ipc_answer_0(iid, ENOTSUP);
280	return;	280	return;
281	}	281	}
282		282
283	driver->phone = IPC_GET_ARG5(call);	283	driver->phone = IPC_GET_ARG5(call);
284		284
285	ipc_answer_0(callid, EOK);	285	ipc_answer_0(callid, EOK);
286		286
287	list_initialize(&(driver->drivers));	287	list_initialize(&(driver->drivers));
288		288
289	fibril_mutex_lock(&drivers_list_mutex);	289	fibril_mutex_lock(&drivers_list_mutex);
290		290
291	/* TODO:	291	/* TODO:
292	* check that no driver with name equal to driver->name is registered	292	* check that no driver with name equal to driver->name is registered
293	*/	293	*/
294		294
295	/*	295	/*
296	* Insert new driver into list of registered drivers	296	* Insert new driver into list of registered drivers
297	*/	297	*/
298	list_append(&(driver->drivers), &drivers_list);	298	list_append(&(driver->drivers), &drivers_list);
299	fibril_mutex_unlock(&drivers_list_mutex);	299	fibril_mutex_unlock(&drivers_list_mutex);
300		300
301	ipc_answer_0(iid, EOK);	301	ipc_answer_0(iid, EOK);
302		302
303	*odriver = driver;	303	*odriver = driver;
304	}	304	}
305		305
306	/**	306	/**
307	* Unregister device driver, unregister all its devices and free driver	307	* Unregister device driver, unregister all its devices and free driver
308	* structure.	308	* structure.
309	*	309	*
310	*/	310	*/
311	static int devmap_driver_unregister(devmap_driver_t *driver)	311	static int devmap_driver_unregister(devmap_driver_t *driver)
312	{	312	{
313	if (driver == NULL)	313	if (driver == NULL)
314	return EEXISTS;	314	return EEXISTS;
315		315
316	fibril_mutex_lock(&drivers_list_mutex);	316	fibril_mutex_lock(&drivers_list_mutex);
317		317
318	if (driver->phone != 0)	318	if (driver->phone != 0)
319	ipc_hangup(driver->phone);	319	ipc_hangup(driver->phone);
320		320
321	/* Remove it from list of drivers */	321	/* Remove it from list of drivers */
322	list_remove(&(driver->drivers));	322	list_remove(&(driver->drivers));
323		323
324	/* Unregister all its devices */	324	/* Unregister all its devices */
325	fibril_mutex_lock(&devices_list_mutex);	325	fibril_mutex_lock(&devices_list_mutex);
326	fibril_mutex_lock(&driver->devices_mutex);	326	fibril_mutex_lock(&driver->devices_mutex);
327		327
328	while (!list_empty(&(driver->devices))) {	328	while (!list_empty(&(driver->devices))) {
329	devmap_device_t *device = list_get_instance(driver->devices.next,	329	devmap_device_t *device = list_get_instance(driver->devices.next,
330	devmap_device_t, driver_devices);	330	devmap_device_t, driver_devices);
331	devmap_device_unregister_core(device);	331	devmap_device_unregister_core(device);
332	}	332	}
333		333
334	fibril_mutex_unlock(&driver->devices_mutex);	334	fibril_mutex_unlock(&driver->devices_mutex);
335	fibril_mutex_unlock(&devices_list_mutex);	335	fibril_mutex_unlock(&devices_list_mutex);
336	fibril_mutex_unlock(&drivers_list_mutex);	336	fibril_mutex_unlock(&drivers_list_mutex);
337		337
338	/* free name and driver */	338	/* free name and driver */
339	if (driver->name != NULL)	339	if (driver->name != NULL)
340	free(driver->name);	340	free(driver->name);
341		341
342	free(driver);	342	free(driver);
343		343
344	return EOK;	344	return EOK;
345	}	345	}
346		346
347		347
348	/** Process pending lookup requests */	348	/** Process pending lookup requests */
349	static void process_pending_lookup(void)	349	static void process_pending_lookup(void)
350	{	350	{
351	link_t *cur;	351	link_t *cur;
352		352
353	loop:	353	loop:
-		354	fibril_mutex_lock(&devices_list_mutex);
-		355	while (!pending_new_dev)
-		356	fibril_condvar_wait(&pending_cv, &devices_list_mutex);
-		357	rescan:
354	for (cur = pending_req.next; cur != &pending_req; cur = cur->next) {	358	for (cur = pending_req.next; cur != &pending_req; cur = cur->next) {
355	pending_req_t *pr = list_get_instance(cur, pending_req_t, link);	359	pending_req_t *pr = list_get_instance(cur, pending_req_t, link);
356		360
357	const devmap_device_t *dev = devmap_device_find_name(pr->name);	361	const devmap_device_t *dev = devmap_device_find_name(pr->name);
358	if (!dev)	362	if (!dev)
359	continue;	363	continue;
360		364
361	ipc_answer_1(pr->callid, EOK, dev->handle);	365	ipc_answer_1(pr->callid, EOK, dev->handle);
362		366
363	free(pr->name);	367	free(pr->name);
364	list_remove(cur);	368	list_remove(cur);
365	free(pr);	369	free(pr);
366		370
367	goto loop;	371	goto rescan;
368	}	372	}
-		373	pending_new_dev = false;
-		374	fibril_mutex_unlock(&devices_list_mutex);
-		375	goto loop;
369	}	376	}
370		377
371		378
372	/** Register instance of device	379	/** Register instance of device
373	*	380	*
374	*/	381	*/
375	static void devmap_device_register(ipc_callid_t iid, ipc_call_t *icall,	382	static void devmap_device_register(ipc_callid_t iid, ipc_call_t *icall,
376	devmap_driver_t *driver)	383	devmap_driver_t *driver)
377	{	384	{
378	if (driver == NULL) {	385	if (driver == NULL) {
379	ipc_answer_0(iid, EREFUSED);	386	ipc_answer_0(iid, EREFUSED);
380	return;	387	return;
381	}	388	}
382		389
383	/* Create new device entry */	390	/* Create new device entry */
384	devmap_device_t device = (devmap_device_t ) malloc(sizeof(devmap_device_t));	391	devmap_device_t device = (devmap_device_t ) malloc(sizeof(devmap_device_t));
385	if (device == NULL) {	392	if (device == NULL) {
386	ipc_answer_0(iid, ENOMEM);	393	ipc_answer_0(iid, ENOMEM);
387	return;	394	return;
388	}	395	}
389		396
390	/* Get device name */	397	/* Get device name */
391	ipc_callid_t callid;	398	ipc_callid_t callid;
392	size_t size;	399	size_t size;
393	if (!ipc_data_write_receive(&callid, &size)) {	400	if (!ipc_data_write_receive(&callid, &size)) {
394	free(device);	401	free(device);
395	ipc_answer_0(iid, EREFUSED);	402	ipc_answer_0(iid, EREFUSED);
396	return;	403	return;
397	}	404	}
398		405
399	if (size > DEVMAP_NAME_MAXLEN) {	406	if (size > DEVMAP_NAME_MAXLEN) {
400	free(device);	407	free(device);
401	ipc_answer_0(callid, EINVAL);	408	ipc_answer_0(callid, EINVAL);
402	ipc_answer_0(iid, EREFUSED);	409	ipc_answer_0(iid, EREFUSED);
403	return;	410	return;
404	}	411	}
405		412
406	/* +1 for terminating \0 */	413	/* +1 for terminating \0 */
407	device->name = (char *) malloc(size + 1);	414	device->name = (char *) malloc(size + 1);
408		415
409	if (device->name == NULL) {	416	if (device->name == NULL) {
410	free(device);	417	free(device);
411	ipc_answer_0(callid, ENOMEM);	418	ipc_answer_0(callid, ENOMEM);
412	ipc_answer_0(iid, EREFUSED);	419	ipc_answer_0(iid, EREFUSED);
413	return;	420	return;
414	}	421	}
415		422
416	ipc_data_write_finalize(callid, device->name, size);	423	ipc_data_write_finalize(callid, device->name, size);
417	device->name[size] = 0;	424	device->name[size] = 0;
418		425
419	list_initialize(&(device->devices));	426	list_initialize(&(device->devices));
420	list_initialize(&(device->driver_devices));	427	list_initialize(&(device->driver_devices));
421		428
422	fibril_mutex_lock(&devices_list_mutex);	429	fibril_mutex_lock(&devices_list_mutex);
423		430
424	/* Check that device with such name is not already registered */	431	/* Check that device with such name is not already registered */
425	if (NULL != devmap_device_find_name(device->name)) {	432	if (NULL != devmap_device_find_name(device->name)) {
426	printf(NAME ": Device '%s' already registered\n", device->name);	433	printf(NAME ": Device '%s' already registered\n", device->name);
427	fibril_mutex_unlock(&devices_list_mutex);	434	fibril_mutex_unlock(&devices_list_mutex);
428	free(device->name);	435	free(device->name);
429	free(device);	436	free(device);
430	ipc_answer_0(iid, EEXISTS);	437	ipc_answer_0(iid, EEXISTS);
431	return;	438	return;
432	}	439	}
433		440
434	/* Get unique device handle */	441	/* Get unique device handle */
435	device->handle = devmap_create_handle();	442	device->handle = devmap_create_handle();
436		443
437	device->driver = driver;	444	device->driver = driver;
438		445
439	/* Insert device into list of all devices */	446	/* Insert device into list of all devices */
440	list_append(&device->devices, &devices_list);	447	list_append(&device->devices, &devices_list);
441		448
442	/* Insert device into list of devices that belog to one driver */	449	/* Insert device into list of devices that belog to one driver */
443	fibril_mutex_lock(&device->driver->devices_mutex);	450	fibril_mutex_lock(&device->driver->devices_mutex);
444		451
445	list_append(&device->driver_devices, &device->driver->devices);	452	list_append(&device->driver_devices, &device->driver->devices);
446		453
447	fibril_mutex_unlock(&device->driver->devices_mutex);	454	fibril_mutex_unlock(&device->driver->devices_mutex);
-		455	pending_new_dev = true;
-		456	fibril_condvar_signal(&pending_cv);
448	fibril_mutex_unlock(&devices_list_mutex);	457	fibril_mutex_unlock(&devices_list_mutex);
449		458
450	ipc_answer_1(iid, EOK, device->handle);	459	ipc_answer_1(iid, EOK, device->handle);
451	}	460	}
452		461
453	/**	462	/**
454	*	463	*
455	*/	464	*/
456	static int devmap_device_unregister(ipc_callid_t iid, ipc_call_t *icall,	465	static int devmap_device_unregister(ipc_callid_t iid, ipc_call_t *icall,
457	devmap_driver_t *driver)	466	devmap_driver_t *driver)
458	{	467	{
459	/* TODO */	468	/* TODO */
460	return EOK;	469	return EOK;
461	}	470	}
462		471
463	/** Connect client to the device.	472	/** Connect client to the device.
464	*	473	*
465	* Find device driver owning requested device and forward	474	* Find device driver owning requested device and forward
466	* the message to it.	475	* the message to it.
467	*	476	*
468	*/	477	*/
469	static void devmap_forward(ipc_callid_t callid, ipc_call_t *call)	478	static void devmap_forward(ipc_callid_t callid, ipc_call_t *call)
470	{	479	{
471	/*	480	/*
472	* Get handle from request	481	* Get handle from request
473	*/	482	*/
474	dev_handle_t handle = IPC_GET_ARG2(*call);	483	dev_handle_t handle = IPC_GET_ARG2(*call);
475	devmap_device_t *dev = devmap_device_find_handle(handle);	484	devmap_device_t *dev = devmap_device_find_handle(handle);
476		485
477	if ((dev == NULL) \|\| (dev->driver == NULL) \|\| (dev->driver->phone == 0)) {	486	if ((dev == NULL) \|\| (dev->driver == NULL) \|\| (dev->driver->phone == 0)) {
478	ipc_answer_0(callid, ENOENT);	487	ipc_answer_0(callid, ENOENT);
479	return;	488	return;
480	}	489	}
481		490
482	ipc_forward_fast(callid, dev->driver->phone, dev->handle,	491	ipc_forward_fast(callid, dev->driver->phone, dev->handle,
483	IPC_GET_ARG3(*call), 0, IPC_FF_NONE);	492	IPC_GET_ARG3(*call), 0, IPC_FF_NONE);
484	}	493	}
485		494
486	/** Find handle for device instance identified by name.	495	/** Find handle for device instance identified by name.
487	*	496	*

Subversion Repositories HelenOS

(root)/trunk/uspace/srv/devmap/devmap.c @ 4504 – Rev 4524 → 4540