| /* |
| * Copyright (c) 2005 Topspin Communications. 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. |
| */ |
| |
| #if HAVE_CONFIG_H |
| # include <config.h> |
| #endif /* HAVE_CONFIG_H */ |
| |
| #include <stdlib.h> |
| #include <netinet/in.h> |
| #include <pthread.h> |
| #include <string.h> |
| |
| #include "mlx4.h" |
| |
| struct mlx4_db_page { |
| struct mlx4_db_page *prev, *next; |
| struct mlx4_buf buf; |
| int num_db; |
| int use_cnt; |
| unsigned long free[0]; |
| }; |
| |
| static const int db_size[] = { |
| [MLX4_DB_TYPE_CQ] = 8, |
| [MLX4_DB_TYPE_RQ] = 4, |
| }; |
| |
| static struct mlx4_db_page *__add_page(struct mlx4_context *context, |
| enum mlx4_db_type type) |
| { |
| struct mlx4_db_page *page; |
| int ps = to_mdev(context->ibv_ctx.device)->page_size; |
| int pp; |
| int i; |
| |
| pp = ps / db_size[type]; |
| |
| page = malloc(sizeof *page + pp / 8); |
| if (!page) |
| return NULL; |
| |
| if (mlx4_alloc_buf(&page->buf, ps, ps)) { |
| free(page); |
| return NULL; |
| } |
| |
| page->num_db = pp; |
| page->use_cnt = 0; |
| for (i = 0; i < pp / (sizeof (long) * 8); ++i) |
| page->free[i] = ~0; |
| |
| page->prev = NULL; |
| page->next = context->db_list[type]; |
| context->db_list[type] = page; |
| if (page->next) |
| page->next->prev = page; |
| |
| return page; |
| } |
| |
| uint32_t *mlx4_alloc_db(struct mlx4_context *context, enum mlx4_db_type type) |
| { |
| struct mlx4_db_page *page; |
| uint32_t *db = NULL; |
| int i, j; |
| |
| pthread_mutex_lock(&context->db_list_mutex); |
| |
| for (page = context->db_list[type]; page; page = page->next) |
| if (page->use_cnt < page->num_db) |
| goto found; |
| |
| page = __add_page(context, type); |
| if (!page) |
| goto out; |
| |
| found: |
| ++page->use_cnt; |
| |
| for (i = 0; !page->free[i]; ++i) |
| /* nothing */; |
| |
| j = ffsl(page->free[i]); |
| page->free[i] &= ~(1UL << (j - 1)); |
| db = page->buf.buf + (i * 8 * sizeof (long) + (j - 1)) * db_size[type]; |
| |
| out: |
| pthread_mutex_unlock(&context->db_list_mutex); |
| |
| return db; |
| } |
| |
| void mlx4_free_db(struct mlx4_context *context, enum mlx4_db_type type, uint32_t *db) |
| { |
| struct mlx4_db_page *page; |
| uintptr_t ps = to_mdev(context->ibv_ctx.device)->page_size; |
| int i; |
| |
| pthread_mutex_lock(&context->db_list_mutex); |
| |
| for (page = context->db_list[type]; page; page = page->next) |
| if (((uintptr_t) db & ~(ps - 1)) == (uintptr_t) page->buf.buf) |
| break; |
| |
| if (!page) |
| goto out; |
| |
| i = ((void *) db - page->buf.buf) / db_size[type]; |
| page->free[i / (8 * sizeof (long))] |= 1UL << (i % (8 * sizeof (long))); |
| |
| if (!--page->use_cnt) { |
| if (page->prev) |
| page->prev->next = page->next; |
| else |
| context->db_list[type] = page->next; |
| if (page->next) |
| page->next->prev = page->prev; |
| |
| mlx4_free_buf(&page->buf); |
| free(page); |
| } |
| |
| out: |
| pthread_mutex_unlock(&context->db_list_mutex); |
| } |