1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 #ifndef _LINUX_DMAPOOL_H_ 32 #define _LINUX_DMAPOOL_H_ 33 34 #include <linux/types.h> 35 #include <linux/io.h> 36 #include <linux/scatterlist.h> 37 #include <linux/device.h> 38 #include <linux/slab.h> 39 40 struct dma_pool { 41 uma_zone_t pool_zone; 42 }; 43 44 static inline struct dma_pool * 45 dma_pool_create(char *name, struct device *dev, size_t size, 46 size_t align, size_t boundary) 47 { 48 struct dma_pool *pool; 49 50 pool = kmalloc(sizeof(*pool), GFP_KERNEL); 51 align--; 52 /* 53 * XXX Eventually this could use a separate allocf to honor boundary 54 * and physical address requirements of the device. 55 */ 56 pool->pool_zone = uma_zcreate(name, size, NULL, NULL, NULL, NULL, 57 align, UMA_ZONE_OFFPAGE|UMA_ZONE_HASH); 58 59 return (pool); 60 } 61 62 static inline void 63 dma_pool_destroy(struct dma_pool *pool) 64 { 65 uma_zdestroy(pool->pool_zone); 66 kfree(pool); 67 } 68 69 static inline void * 70 dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle) 71 { 72 void *vaddr; 73 74 vaddr = uma_zalloc(pool->pool_zone, mem_flags); 75 if (vaddr) 76 *handle = vtophys(vaddr); 77 return (vaddr); 78 } 79 80 static inline void 81 dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr) 82 { 83 uma_zfree(pool->pool_zone, vaddr); 84 } 85 86 87 #endif /* _LINUX_DMAPOOL_H_ */ 88