transfer_list.c

Go to the documentation of this file.

/*
 * Copyright (c) 2011 Jan Vesely
 * 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.
 */
#include <errno.h>
#include <usb/debug.h>
#include <arch/barrier.h>


#include "transfer_list.h"
#include "batch.h"

static void transfer_list_remove_batch(
    transfer_list_t *instance, usb_transfer_batch_t *batch);
/*----------------------------------------------------------------------------*/
int transfer_list_init(transfer_list_t *instance, const char *name)
{
        assert(instance);
        instance->name = name;
        instance->queue_head = malloc32(sizeof(qh_t));
        if (!instance->queue_head) {
                usb_log_error("Failed to allocate queue head.\n");
                return ENOMEM;
        }
        const uint32_t queue_head_pa = addr_to_phys(instance->queue_head);
        usb_log_debug2("Transfer list %s setup with QH: %p (%#" PRIx32" ).\n",
            name, instance->queue_head, queue_head_pa);

        qh_init(instance->queue_head);
        list_initialize(&instance->batch_list);
        fibril_mutex_initialize(&instance->guard);
        return EOK;
}
/*----------------------------------------------------------------------------*/
void transfer_list_fini(transfer_list_t *instance)
{
        assert(instance);
        free32(instance->queue_head);
}
void transfer_list_set_next(transfer_list_t *instance, transfer_list_t *next)
{
        assert(instance);
        assert(instance->queue_head);
        assert(next);
        /* Set queue_head.next to point to the follower */
        qh_set_next_qh(instance->queue_head, next->queue_head);
}
/*----------------------------------------------------------------------------*/
void transfer_list_add_batch(
    transfer_list_t *instance, usb_transfer_batch_t *batch)
{
        assert(instance);
        assert(batch);
        usb_log_debug2("Queue %s: Adding batch(%p).\n", instance->name, batch);

        fibril_mutex_lock(&instance->guard);

        qh_t *last_qh = NULL;
        /* Add to the hardware queue. */
        if (list_empty(&instance->batch_list)) {
                /* There is nothing scheduled */
                last_qh = instance->queue_head;
        } else {
                /* There is something scheduled */
                usb_transfer_batch_t *last =
                    usb_transfer_batch_from_link(instance->batch_list.prev);
                last_qh = batch_qh(last);
        }
        const uint32_t pa = addr_to_phys(batch_qh(batch));
        assert((pa & LINK_POINTER_ADDRESS_MASK) == pa);

        /* Make sure all data in the batch are written */
        write_barrier();

        /* keep link */
        batch_qh(batch)->next = last_qh->next;
        qh_set_next_qh(last_qh, batch_qh(batch));

        /* Make sure the pointer is updated */
        write_barrier();

        /* Add to the driver's list */
        list_append(&batch->link, &instance->batch_list);

        usb_transfer_batch_t *first = list_get_instance(
            instance->batch_list.next, usb_transfer_batch_t, link);
        usb_log_debug("Batch(%p) added to queue %s, first is %p.\n",
                batch, instance->name, first);
        fibril_mutex_unlock(&instance->guard);
}
/*----------------------------------------------------------------------------*/
void transfer_list_remove_finished(transfer_list_t *instance, link_t *done)
{
        assert(instance);
        assert(done);

        fibril_mutex_lock(&instance->guard);
        link_t *current = instance->batch_list.next;
        while (current != &instance->batch_list) {
                link_t * const next = current->next;
                usb_transfer_batch_t *batch =
                    usb_transfer_batch_from_link(current);

                if (batch_is_complete(batch)) {
                        /* Save for processing */
                        transfer_list_remove_batch(instance, batch);
                        list_append(current, done);
                }
                current = next;
        }
        fibril_mutex_unlock(&instance->guard);
}
/*----------------------------------------------------------------------------*/
void transfer_list_abort_all(transfer_list_t *instance)
{
        fibril_mutex_lock(&instance->guard);
        while (!list_empty(&instance->batch_list)) {
                link_t * const current = instance->batch_list.next;
                usb_transfer_batch_t *batch =
                    usb_transfer_batch_from_link(current);
                transfer_list_remove_batch(instance, batch);
                usb_transfer_batch_finish_error(batch, EINTR);
        }
        fibril_mutex_unlock(&instance->guard);
}
/*----------------------------------------------------------------------------*/
void transfer_list_remove_batch(
    transfer_list_t *instance, usb_transfer_batch_t *batch)
{
        assert(instance);
        assert(instance->queue_head);
        assert(batch);
        assert(batch_qh(batch));
        assert(fibril_mutex_is_locked(&instance->guard));

        usb_log_debug2(
            "Queue %s: removing batch(%p).\n", instance->name, batch);

        const char *qpos = NULL;
        qh_t *prev_qh = NULL;
        /* Remove from the hardware queue */
        if (instance->batch_list.next == &batch->link) {
                /* I'm the first one here */
                prev_qh = instance->queue_head;
                qpos = "FIRST";
        } else {
                /* The thing before me is a batch too */
                usb_transfer_batch_t *prev =
                    usb_transfer_batch_from_link(batch->link.prev);
                prev_qh = batch_qh(prev);
                qpos = "NOT FIRST";
        }
        assert((prev_qh->next & LINK_POINTER_ADDRESS_MASK)
            == addr_to_phys(batch_qh(batch)));
        prev_qh->next = batch_qh(batch)->next;

        /* Make sure the pointer is updated */
        write_barrier();

        /* Remove from the batch list */
        list_remove(&batch->link);
        usb_log_debug("Batch(%p) removed (%s) from %s, next: %x.\n",
            batch, qpos, instance->name, batch_qh(batch)->next);
}

---