source: mainline/uspace/lib/device/src/bd_srv.c

/*
 * Copyright (c) 2025 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 libdevice
 * @{
 */
/**
 * @file
 * @brief Block device server stub
 */
#include <errno.h>
#include <ipc/bd.h>
#include <macros.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdint.h>

#include <bd_srv.h>

static void bd_read_blocks_srv(bd_srv_t *srv, ipc_call_t *call)
{
        aoff64_t ba;
        size_t cnt;
        void *buf;
        size_t size;
        errno_t rc;

        ba = MERGE_LOUP32(ipc_get_arg1(call), ipc_get_arg2(call));
        cnt = ipc_get_arg3(call);

        ipc_call_t rcall;
        if (!async_data_read_receive(&rcall, &size)) {
                async_answer_0(&rcall, EINVAL);
                async_answer_0(call, EINVAL);
                return;
        }

        buf = malloc(size);
        if (buf == NULL) {
                async_answer_0(&rcall, ENOMEM);
                async_answer_0(call, ENOMEM);
                return;
        }

        if (srv->srvs->ops->read_blocks == NULL) {
                async_answer_0(&rcall, ENOTSUP);
                async_answer_0(call, ENOTSUP);
                free(buf);
                return;
        }

        rc = srv->srvs->ops->read_blocks(srv, ba, cnt, buf, size);
        if (rc != EOK) {
                async_answer_0(&rcall, ENOMEM);
                async_answer_0(call, ENOMEM);
                free(buf);
                return;
        }

        async_data_read_finalize(&rcall, buf, size);

        free(buf);
        async_answer_0(call, EOK);
}

static void bd_read_toc_srv(bd_srv_t *srv, ipc_call_t *call)
{
        uint8_t session;
        void *buf;
        size_t size;
        errno_t rc;

        session = ipc_get_arg1(call);

        ipc_call_t rcall;
        if (!async_data_read_receive(&rcall, &size)) {
                async_answer_0(&rcall, EINVAL);
                async_answer_0(call, EINVAL);
                return;
        }

        buf = malloc(size);
        if (buf == NULL) {
                async_answer_0(&rcall, ENOMEM);
                async_answer_0(call, ENOMEM);
                return;
        }

        if (srv->srvs->ops->read_toc == NULL) {
                async_answer_0(&rcall, ENOTSUP);
                async_answer_0(call, ENOTSUP);
                free(buf);
                return;
        }

        rc = srv->srvs->ops->read_toc(srv, session, buf, size);
        if (rc != EOK) {
                async_answer_0(&rcall, ENOMEM);
                async_answer_0(call, ENOMEM);
                free(buf);
                return;
        }

        async_data_read_finalize(&rcall, buf, size);

        free(buf);
        async_answer_0(call, EOK);
}

static void bd_sync_cache_srv(bd_srv_t *srv, ipc_call_t *call)
{
        aoff64_t ba;
        size_t cnt;
        errno_t rc;

        ba = MERGE_LOUP32(ipc_get_arg1(call), ipc_get_arg2(call));
        cnt = ipc_get_arg3(call);

        if (srv->srvs->ops->sync_cache == NULL) {
                async_answer_0(call, ENOTSUP);
                return;
        }

        rc = srv->srvs->ops->sync_cache(srv, ba, cnt);
        async_answer_0(call, rc);
}

static void bd_write_blocks_srv(bd_srv_t *srv, ipc_call_t *call)
{
        aoff64_t ba;
        size_t cnt;
        void *data;
        size_t size;
        errno_t rc;

        ba = MERGE_LOUP32(ipc_get_arg1(call), ipc_get_arg2(call));
        cnt = ipc_get_arg3(call);

        rc = async_data_write_accept(&data, false, 0, 0, 0, &size);
        if (rc != EOK) {
                async_answer_0(call, rc);
                return;
        }

        if (srv->srvs->ops->write_blocks == NULL) {
                async_answer_0(call, ENOTSUP);
                return;
        }

        rc = srv->srvs->ops->write_blocks(srv, ba, cnt, data, size);
        free(data);
        async_answer_0(call, rc);
}

static void bd_get_block_size_srv(bd_srv_t *srv, ipc_call_t *call)
{
        errno_t rc;
        size_t block_size;

        if (srv->srvs->ops->get_block_size == NULL) {
                async_answer_0(call, ENOTSUP);
                return;
        }

        rc = srv->srvs->ops->get_block_size(srv, &block_size);
        async_answer_1(call, rc, block_size);
}

static void bd_get_num_blocks_srv(bd_srv_t *srv, ipc_call_t *call)
{
        errno_t rc;
        aoff64_t num_blocks;

        if (srv->srvs->ops->get_num_blocks == NULL) {
                async_answer_0(call, ENOTSUP);
                return;
        }

        rc = srv->srvs->ops->get_num_blocks(srv, &num_blocks);
        async_answer_2(call, rc, LOWER32(num_blocks), UPPER32(num_blocks));
}

static void bd_eject_srv(bd_srv_t *srv, ipc_call_t *call)
{
        errno_t rc;

        if (srv->srvs->ops->eject == NULL) {
                async_answer_0(call, ENOTSUP);
                return;
        }

        rc = srv->srvs->ops->eject(srv);
        async_answer_0(call, rc);
}

static bd_srv_t *bd_srv_create(bd_srvs_t *srvs)
{
        bd_srv_t *srv;

        srv = calloc(1, sizeof(bd_srv_t));
        if (srv == NULL)
                return NULL;

        srv->srvs = srvs;
        return srv;
}

void bd_srvs_init(bd_srvs_t *srvs)
{
        srvs->ops = NULL;
        srvs->sarg = NULL;
}

errno_t bd_conn(ipc_call_t *icall, bd_srvs_t *srvs)
{
        bd_srv_t *srv;
        errno_t rc;

        /* Accept the connection */
        async_accept_0(icall);

        srv = bd_srv_create(srvs);
        if (srv == NULL)
                return ENOMEM;

        async_sess_t *sess = async_callback_receive(EXCHANGE_SERIALIZE);
        if (sess == NULL)
                return ENOMEM;

        srv->client_sess = sess;

        rc = srvs->ops->open(srvs, srv);
        if (rc != EOK)
                return rc;

        while (true) {
                ipc_call_t call;
                async_get_call(&call);
                sysarg_t method = ipc_get_imethod(&call);

                if (!method) {
                        /* The other side has hung up */
                        async_answer_0(&call, EOK);
                        break;
                }

                switch (method) {
                case BD_READ_BLOCKS:
                        bd_read_blocks_srv(srv, &call);
                        break;
                case BD_READ_TOC:
                        bd_read_toc_srv(srv, &call);
                        break;
                case BD_SYNC_CACHE:
                        bd_sync_cache_srv(srv, &call);
                        break;
                case BD_WRITE_BLOCKS:
                        bd_write_blocks_srv(srv, &call);
                        break;
                case BD_GET_BLOCK_SIZE:
                        bd_get_block_size_srv(srv, &call);
                        break;
                case BD_GET_NUM_BLOCKS:
                        bd_get_num_blocks_srv(srv, &call);
                        break;
                case BD_EJECT:
                        bd_eject_srv(srv, &call);
                        break;
                default:
                        async_answer_0(&call, EINVAL);
                }
        }

        rc = srvs->ops->close(srv);
        free(srv);

        return rc;
}

/** @}
 */