/*
* Copyright (c) 2005 Ammasso, Inc. All rights reserved.
* Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* 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 SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "c2.h"
#include "c2_mq.h"
void *c2_mq_alloc(struct c2_mq *q)
{
BUG_ON(q->magic != C2_MQ_MAGIC);
BUG_ON(q->type != C2_MQ_ADAPTER_TARGET);
if (c2_mq_full(q)) {
return NULL;
} else {
#ifdef DEBUG
struct c2wr_hdr *m =
(struct c2wr_hdr *) (q->msg_pool.host + q->priv * q->msg_size);
#ifdef CCMSGMAGIC
BUG_ON(m->magic != be32_to_cpu(~CCWR_MAGIC));
m->magic = cpu_to_be32(CCWR_MAGIC);
#endif
return m;
#else
return q->msg_pool.host + q->priv * q->msg_size;
#endif
}
}
void c2_mq_produce(struct c2_mq *q)
{
BUG_ON(q->magic != C2_MQ_MAGIC);
BUG_ON(q->type != C2_MQ_ADAPTER_TARGET);
if (!c2_mq_full(q)) {
q->priv = (q->priv + 1) % q->q_size;
q->hint_count++;
/* Update peer's offset. */
__raw_writew((__force u16) cpu_to_be16(q->priv), &q->peer->shared);
}
}
void *c2_mq_consume(struct c2_mq *q)
{
BUG_ON(q->magic != C2_MQ_MAGIC);
BUG_ON(q->type != C2_MQ_HOST_TARGET);
if (c2_mq_empty(q)) {
return NULL;
} else {
#ifdef DEBUG
struct c2wr_hdr *m = (struct c2wr_hdr *)
(q->msg_pool.host + q->priv * q->msg_size);
#ifdef CCMSGMAGIC
BUG_ON(m->magic != be32_to_cpu(CCWR_MAGIC));
#endif
return m;
#else
return q->msg_pool.host + q->priv * q->msg_size;
#endif
}
}
void c2_mq_free(struct c2_mq *q)
{
BUG_ON(q->magic != C2_MQ_MAGIC);
BUG_ON(q->type != C2_MQ_HOST_TARGET);
if (!c2_mq_empty(q)) {
#ifdef CCMSGMAGIC
{
struct c2wr_hdr __iomem *m = (struct c2wr_hdr __iomem *)
(q->msg_pool.adapter + q->priv * q->msg_size);
__raw_writel(cpu_to_be32(~CCWR_MAGIC), &m->magic);
}
#endif
q->priv = (q->priv + 1) % q->q_size;
/* Update peer's offset. */
__raw_writew((__force u16) cpu_to_be16(q->priv), &q->peer->shared);
}
}
void c2_mq_lconsume(struct c2_mq *q, u32 wqe_count)
{
BUG_ON(q->magic != C2_MQ_MAGIC);
BUG_ON(q->type != C2_MQ_ADAPTER_TARGET);
while (wqe_count--) {
BUG_ON(c2_mq_empty(q));
*q->shared = cpu_to_be16((be16_to_cpu(*q->shared)+1) % q->q_size);
}
}
#if 0
u32 c2_mq_count(struct c2_mq *q)
{
s32 count;
if (q->type == C2_MQ_HOST_TARGET)
count = be16_to_cpu(*q->shared) - q->priv;
else
count = q->priv - be16_to_cpu(*q->shared);
if (count < 0)
count += q->q_size;
return (u32) count;
}
#endif /* 0 */
void c2_mq_req_init(struct c2_mq *q, u32 index, u32 q_size, u32 msg_size,
u8 __iomem *pool_start, u16 __iomem *peer, u32 type)
{
BUG_ON(!q->shared);
/* This code assumes the byte swapping has already been done! */
q->index = index;
q->q_size = q_size;
q->msg_size = msg_size;
q->msg_pool.adapter = pool_start;
q->peer = (struct c2_mq_shared __iomem *) peer;
q->magic = C2_MQ_MAGIC;
q->type = type;
q->priv = 0;
q->hint_count = 0;
return;
}
void c2_mq_rep_init(struct c2_mq *q, u32 index, u32 q_size, u32 msg_size,
u8 *pool_start, u16 __iomem *peer, u32 type)
{
BUG_ON(!q->shared);
/* This code assumes the byte swapping has already been done! */
q->index = index;
q->q_size = q_size;
q->msg_size = msg_size;
q->msg_pool.host = pool_start;
q->peer = (struct c2_mq_shared __iomem *) peer;
q->magic = C2_MQ_MAGIC;
q->type = type;
q->priv = 0;
q->hint_count = 0;
return;
}
