| /* |
| * 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; |
| } |