1 /*- 2 * BSD LICENSE 3 * 4 * Copyright (c) Intel Corporation. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #define DEV_BUFFER_SIZE (64 * 1024 * 1024) 35 #define DEV_BUFFER_BLOCKLEN (4096) 36 #define DEV_BUFFER_BLOCKCNT (DEV_BUFFER_SIZE / DEV_BUFFER_BLOCKLEN) 37 uint8_t *g_dev_buffer; 38 39 static struct spdk_io_channel * 40 dev_create_channel(struct spdk_bs_dev *dev) 41 { 42 return NULL; 43 } 44 45 static void 46 dev_destroy_channel(struct spdk_bs_dev *dev, struct spdk_io_channel *channel) 47 { 48 } 49 50 static void 51 dev_destroy(struct spdk_bs_dev *dev) 52 { 53 free(dev); 54 } 55 56 static void 57 dev_read(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, void *payload, 58 uint64_t lba, uint32_t lba_count, 59 struct spdk_bs_dev_cb_args *cb_args) 60 { 61 uint64_t offset, length; 62 63 offset = lba * DEV_BUFFER_BLOCKLEN; 64 length = lba_count * DEV_BUFFER_BLOCKLEN; 65 SPDK_CU_ASSERT_FATAL(offset + length <= DEV_BUFFER_SIZE); 66 memcpy(payload, &g_dev_buffer[offset], length); 67 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0); 68 } 69 70 static void 71 dev_write(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, void *payload, 72 uint64_t lba, uint32_t lba_count, 73 struct spdk_bs_dev_cb_args *cb_args) 74 { 75 uint64_t offset, length; 76 77 offset = lba * DEV_BUFFER_BLOCKLEN; 78 length = lba_count * DEV_BUFFER_BLOCKLEN; 79 SPDK_CU_ASSERT_FATAL(offset + length <= DEV_BUFFER_SIZE); 80 memcpy(&g_dev_buffer[offset], payload, length); 81 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0); 82 } 83 84 static void 85 __check_iov(struct iovec *iov, int iovcnt, uint64_t length) 86 { 87 int i; 88 89 for (i = 0; i < iovcnt; i++) { 90 length -= iov[i].iov_len; 91 } 92 93 CU_ASSERT(length == 0); 94 } 95 96 static void 97 dev_readv(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, 98 struct iovec *iov, int iovcnt, 99 uint64_t lba, uint32_t lba_count, 100 struct spdk_bs_dev_cb_args *cb_args) 101 { 102 uint64_t offset, length; 103 int i; 104 105 offset = lba * DEV_BUFFER_BLOCKLEN; 106 length = lba_count * DEV_BUFFER_BLOCKLEN; 107 SPDK_CU_ASSERT_FATAL(offset + length <= DEV_BUFFER_SIZE); 108 __check_iov(iov, iovcnt, length); 109 110 for (i = 0; i < iovcnt; i++) { 111 memcpy(iov[i].iov_base, &g_dev_buffer[offset], iov[i].iov_len); 112 offset += iov[i].iov_len; 113 } 114 115 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0); 116 } 117 118 static void 119 dev_writev(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, 120 struct iovec *iov, int iovcnt, 121 uint64_t lba, uint32_t lba_count, 122 struct spdk_bs_dev_cb_args *cb_args) 123 { 124 uint64_t offset, length; 125 int i; 126 127 offset = lba * DEV_BUFFER_BLOCKLEN; 128 length = lba_count * DEV_BUFFER_BLOCKLEN; 129 SPDK_CU_ASSERT_FATAL(offset + length <= DEV_BUFFER_SIZE); 130 __check_iov(iov, iovcnt, length); 131 132 for (i = 0; i < iovcnt; i++) { 133 memcpy(&g_dev_buffer[offset], iov[i].iov_base, iov[i].iov_len); 134 offset += iov[i].iov_len; 135 } 136 137 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0); 138 } 139 140 static void 141 dev_flush(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, 142 struct spdk_bs_dev_cb_args *cb_args) 143 { 144 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0); 145 } 146 147 static void 148 dev_unmap(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, 149 uint64_t lba, uint32_t lba_count, 150 struct spdk_bs_dev_cb_args *cb_args) 151 { 152 uint64_t offset, length; 153 154 offset = lba * DEV_BUFFER_BLOCKLEN; 155 length = lba_count * DEV_BUFFER_BLOCKLEN; 156 SPDK_CU_ASSERT_FATAL(offset + length <= DEV_BUFFER_SIZE); 157 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0); 158 } 159 160 static void 161 dev_write_zeroes(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, 162 uint64_t lba, uint32_t lba_count, 163 struct spdk_bs_dev_cb_args *cb_args) 164 { 165 uint64_t offset, length; 166 167 offset = lba * DEV_BUFFER_BLOCKLEN; 168 length = lba_count * DEV_BUFFER_BLOCKLEN; 169 SPDK_CU_ASSERT_FATAL(offset + length <= DEV_BUFFER_SIZE); 170 memset(&g_dev_buffer[offset], 0, length); 171 cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0); 172 } 173 174 static struct spdk_bs_dev * 175 init_dev(void) 176 { 177 struct spdk_bs_dev *dev = calloc(1, sizeof(*dev)); 178 179 SPDK_CU_ASSERT_FATAL(dev != NULL); 180 181 dev->create_channel = dev_create_channel; 182 dev->destroy_channel = dev_destroy_channel; 183 dev->destroy = dev_destroy; 184 dev->read = dev_read; 185 dev->write = dev_write; 186 dev->readv = dev_readv; 187 dev->writev = dev_writev; 188 dev->flush = dev_flush; 189 dev->unmap = dev_unmap; 190 dev->write_zeroes = dev_write_zeroes; 191 dev->blockcnt = DEV_BUFFER_BLOCKCNT; 192 dev->blocklen = DEV_BUFFER_BLOCKLEN; 193 194 return dev; 195 } 196