source: mainline/uspace/srv/bd/sata_bd/sata_bd.c@ c1694b6b

/*
 * Copyright (c) 2012 Petr Jerman
 * 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 bd
 * @{
 */

/**
 * @file
 * @brief SATA disk driver
 *
 */

#include <stddef.h>
#include <bd_srv.h>
#include <devman.h>
#include <errno.h>
#include <str_error.h>
#include <stdio.h>
#include <str.h>
#include <loc.h>
#include <macros.h>
#include <task.h>

#include <ahci_iface.h>
#include "sata_bd.h"

#define NAME       "sata_bd"
#define NAMESPACE  "bd"

/** Maximum number of disks handled */
#define MAXDISKS  256

static sata_bd_dev_t disk[MAXDISKS];
static int disk_count;

static int sata_bd_open(bd_srvs_t *, bd_srv_t *);
static int sata_bd_close(bd_srv_t *);
static int sata_bd_read_blocks(bd_srv_t *, aoff64_t, size_t, void *, size_t);
static int sata_bd_write_blocks(bd_srv_t *, aoff64_t, size_t, const void *, size_t);
static int sata_bd_get_block_size(bd_srv_t *, size_t *);
static int sata_bd_get_num_blocks(bd_srv_t *, aoff64_t *);

static bd_ops_t sata_bd_ops = {
        .open = sata_bd_open,
        .close = sata_bd_close,
        .read_blocks = sata_bd_read_blocks,
        .write_blocks = sata_bd_write_blocks,
        .get_block_size = sata_bd_get_block_size,
        .get_num_blocks = sata_bd_get_num_blocks
};

static sata_bd_dev_t *bd_srv_sata(bd_srv_t *bd)
{
        return (sata_bd_dev_t *) bd->srvs->sarg;
}

/** Find SATA devices in device tree.
 *
 *  @param Device manager handle describing container for searching.  
 *
 *  @return EOK if succeed, error code otherwise.
 *
 */
static int scan_device_tree(devman_handle_t funh)
{
        devman_handle_t devh;
        devman_handle_t *cfuns;
        size_t count, i;
        int rc;
                
        /* If device is SATA, add device to the disk array. */
        disk[disk_count].sess = ahci_get_sess(funh, &disk[disk_count].dev_name);
        if(disk[disk_count].sess != NULL) {
                
                ahci_get_sata_device_name(disk[disk_count].sess,
                    SATA_DEV_NAME_LENGTH, disk[disk_count].sata_dev_name);
                
                ahci_get_block_size(disk[disk_count].sess,
                    &disk[disk_count].block_size);
                
                ahci_get_num_blocks(disk[disk_count].sess, &disk[disk_count].blocks);
                
                bd_srvs_init(&disk[disk_count].bds);
                disk[disk_count].bds.ops = &sata_bd_ops;
                disk[disk_count].bds.sarg = &disk[disk_count];
                
                printf("Device %s - %s , blocks: %lu, block_size: %lu\n", 
                    disk[disk_count].dev_name, disk[disk_count].sata_dev_name,
                            (long unsigned int) disk[disk_count].blocks,
                                (long unsigned int) disk[disk_count].block_size);

                ++disk_count;
        }
        
        /* search children */
        rc = devman_fun_get_child(funh, &devh);
        if (rc == ENOENT)
                return EOK;

        if (rc != EOK) {
                printf(NAME ": Failed getting child device for function %s.\n", "xxx");
                return rc;
        }

        rc = devman_dev_get_functions(devh, &cfuns, &count);
        if (rc != EOK) {
                printf(NAME ": Failed getting list of functions for device %s.\n",
                    "xxx");
                return rc;
        }

        for (i = 0; i < count; i++)
                scan_device_tree(cfuns[i]);

        free(cfuns);
        return EOK;
}

/** Find sata devices in device tree from root.
 *
 *  @return EOK if succeed, error code otherwise.
 *
 */
static int get_sata_disks(void)
{
        devman_handle_t root_fun;
        int rc;
        
        disk_count = 0;

        rc = devman_fun_get_handle("/", &root_fun, 0);
        if (rc != EOK) {
                printf(NAME ": Error resolving root function.\n");
                return EIO;
        }
        
        scan_device_tree(root_fun);
        
        return EOK;
}

/** Block device connection handler. */
static void sata_bd_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
{
        service_id_t dsid;
        int disk_id, i;

        /* Get the device service ID. */
        dsid = IPC_GET_ARG2(*icall);

        /* Determine which disk device is the client connecting to. */
        disk_id = -1;
        for (i = 0; i < MAXDISKS; i++)
                if (disk[i].service_id == dsid)
                        disk_id = i;

        if (disk_id < 0) {
                async_answer_0(iid, EINVAL);
                return;
        }

        bd_conn(iid, icall, &disk[disk_id].bds);
}

/** Open device. */
static int sata_bd_open(bd_srvs_t *bds, bd_srv_t *bd)
{
        return EOK;
}

/** Close device. */
static int sata_bd_close(bd_srv_t *bd)
{
        return EOK;
}

/** Read blocks from partition. */
static int sata_bd_read_blocks(bd_srv_t *bd, aoff64_t ba, size_t cnt, void *buf,
    size_t size)
{
        sata_bd_dev_t *sbd = bd_srv_sata(bd);

        if (size < cnt * sbd->block_size)
                return EINVAL;

        return ahci_read_blocks(sbd->sess, ba, cnt, buf);
}

/** Write blocks to partition. */
static int sata_bd_write_blocks(bd_srv_t *bd, aoff64_t ba, size_t cnt,
    const void *buf, size_t size)
{
        sata_bd_dev_t *sbd = bd_srv_sata(bd);

        if (size < cnt * sbd->block_size)
                return EINVAL;

        return ahci_write_blocks(sbd->sess, ba, cnt, (void *)buf);
}

/** Get device block size. */
static int sata_bd_get_block_size(bd_srv_t *bd, size_t *rsize)
{
        sata_bd_dev_t *sbd = bd_srv_sata(bd);

        *rsize = sbd->block_size;
        return EOK;
}

/** Get number of blocks on device. */
static int sata_bd_get_num_blocks(bd_srv_t *bd, aoff64_t *rnb)
{
        sata_bd_dev_t *sbd = bd_srv_sata(bd);

        *rnb = sbd->blocks;
        return EOK;
}


int main(int argc, char **argv)
{
        int rc;
        category_id_t disk_cat;
        
        async_set_fallback_port_handler(sata_bd_connection, NULL);
        rc = loc_server_register(NAME);
        if (rc < 0) {
                printf(NAME ": Unable to register driver: %s.\n", str_error(rc));
                return rc;
        }
        
        rc = get_sata_disks();
        if (rc != EOK) {
                // TODO: log the error
                return rc;
        }

        rc = loc_category_get_id("disk", &disk_cat, IPC_FLAG_BLOCKING);
        if (rc != EOK) {
                printf("%s: Failed resolving category 'disk': %s.\n", NAME, str_error(rc));
                return rc;
        }

        for(int i = 0; i < disk_count; i++) {
                char name[1024];
                snprintf(name, 1024, "%s/%s", NAMESPACE, disk[i].dev_name);
                rc = loc_service_register(name, &disk[i].service_id);
                if (rc != EOK) {
                        printf(NAME ": Unable to register device %s: %s\n", name, str_error(rc));
                        return rc;
                }

                rc = loc_service_add_to_cat(disk[i].service_id, disk_cat);
                if (rc != EOK) {
                        printf("%s: Failed adding %s to category: %s.",
                            NAME, disk[i].dev_name, str_error(rc));
                        return rc;
                }
        }

        printf(NAME ": Accepting connections\n");
        task_retval(0);
        async_manager();

        /* Not reached */
        return 0;
}

/**
 * @}
 */