1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2014 Alexander Motin <mav@FreeBSD.org> 5 * Copyright (c) 2004, 2005 Silicon Graphics International Corp. 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, this list of conditions and the following disclaimer, 13 * without modification, immediately at the beginning of the file. 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 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/types.h> 37 #include <sys/lock.h> 38 #include <sys/module.h> 39 #include <sys/mutex.h> 40 #include <sys/condvar.h> 41 #include <sys/malloc.h> 42 #include <sys/conf.h> 43 #include <sys/queue.h> 44 #include <sys/sysctl.h> 45 46 #include <cam/cam.h> 47 #include <cam/scsi/scsi_all.h> 48 #include <cam/scsi/scsi_da.h> 49 #include <cam/ctl/ctl_io.h> 50 #include <cam/ctl/ctl.h> 51 #include <cam/ctl/ctl_frontend.h> 52 #include <cam/ctl/ctl_util.h> 53 #include <cam/ctl/ctl_backend.h> 54 #include <cam/ctl/ctl_ioctl.h> 55 #include <cam/ctl/ctl_ha.h> 56 #include <cam/ctl/ctl_private.h> 57 #include <cam/ctl/ctl_debug.h> 58 #include <cam/ctl/ctl_scsi_all.h> 59 #include <cam/ctl/ctl_tpc.h> 60 #include <cam/ctl/ctl_error.h> 61 62 struct tpcl_softc { 63 struct ctl_port port; 64 int cur_tag_num; 65 }; 66 67 static struct tpcl_softc tpcl_softc; 68 69 static int tpcl_init(void); 70 static int tpcl_shutdown(void); 71 static void tpcl_datamove(union ctl_io *io); 72 static void tpcl_done(union ctl_io *io); 73 74 static struct ctl_frontend tpcl_frontend = 75 { 76 .name = "tpc", 77 .init = tpcl_init, 78 .shutdown = tpcl_shutdown, 79 }; 80 CTL_FRONTEND_DECLARE(ctltpc, tpcl_frontend); 81 82 static int 83 tpcl_init(void) 84 { 85 struct tpcl_softc *tsoftc = &tpcl_softc; 86 struct ctl_port *port; 87 struct scsi_transportid_spi *tid; 88 int error, len; 89 90 memset(tsoftc, 0, sizeof(*tsoftc)); 91 92 port = &tsoftc->port; 93 port->frontend = &tpcl_frontend; 94 port->port_type = CTL_PORT_INTERNAL; 95 port->num_requested_ctl_io = 100; 96 port->port_name = "tpc"; 97 port->fe_datamove = tpcl_datamove; 98 port->fe_done = tpcl_done; 99 port->targ_port = -1; 100 port->max_initiators = 1; 101 102 if ((error = ctl_port_register(port)) != 0) { 103 printf("%s: tpc port registration failed\n", __func__); 104 return (error); 105 } 106 107 len = sizeof(struct scsi_transportid_spi); 108 port->init_devid = malloc(sizeof(struct ctl_devid) + len, 109 M_CTL, M_WAITOK | M_ZERO); 110 port->init_devid->len = len; 111 tid = (struct scsi_transportid_spi *)port->init_devid->data; 112 tid->format_protocol = SCSI_TRN_SPI_FORMAT_DEFAULT | SCSI_PROTO_SPI; 113 scsi_ulto2b(0, tid->scsi_addr); 114 scsi_ulto2b(port->targ_port, tid->rel_trgt_port_id); 115 116 ctl_port_online(port); 117 return (0); 118 } 119 120 static int 121 tpcl_shutdown(void) 122 { 123 struct tpcl_softc *tsoftc = &tpcl_softc; 124 struct ctl_port *port = &tsoftc->port; 125 int error; 126 127 ctl_port_offline(port); 128 if ((error = ctl_port_deregister(port)) != 0) 129 printf("%s: tpc port deregistration failed\n", __func__); 130 return (error); 131 } 132 133 static void 134 tpcl_datamove(union ctl_io *io) 135 { 136 struct ctl_sg_entry *ext_sglist, *kern_sglist; 137 struct ctl_sg_entry ext_entry, kern_entry; 138 int ext_sg_entries, kern_sg_entries; 139 int ext_sg_start, ext_offset; 140 int len_to_copy; 141 int kern_watermark, ext_watermark; 142 struct ctl_scsiio *ctsio; 143 int i, j; 144 145 CTL_DEBUG_PRINT(("%s\n", __func__)); 146 147 ctsio = &io->scsiio; 148 149 /* 150 * If this is the case, we're probably doing a BBR read and don't 151 * actually need to transfer the data. This will effectively 152 * bit-bucket the data. 153 */ 154 if (ctsio->ext_data_ptr == NULL) 155 goto bailout; 156 157 /* 158 * To simplify things here, if we have a single buffer, stick it in 159 * a S/G entry and just make it a single entry S/G list. 160 */ 161 if (ctsio->ext_sg_entries > 0) { 162 int len_seen; 163 164 ext_sglist = (struct ctl_sg_entry *)ctsio->ext_data_ptr; 165 ext_sg_entries = ctsio->ext_sg_entries; 166 ext_sg_start = 0; 167 ext_offset = 0; 168 len_seen = 0; 169 for (i = 0; i < ext_sg_entries; i++) { 170 if ((len_seen + ext_sglist[i].len) >= 171 ctsio->ext_data_filled) { 172 ext_sg_start = i; 173 ext_offset = ctsio->ext_data_filled - len_seen; 174 break; 175 } 176 len_seen += ext_sglist[i].len; 177 } 178 } else { 179 ext_sglist = &ext_entry; 180 ext_sglist->addr = ctsio->ext_data_ptr; 181 ext_sglist->len = ctsio->ext_data_len; 182 ext_sg_entries = 1; 183 ext_sg_start = 0; 184 ext_offset = ctsio->ext_data_filled; 185 } 186 187 if (ctsio->kern_sg_entries > 0) { 188 kern_sglist = (struct ctl_sg_entry *)ctsio->kern_data_ptr; 189 kern_sg_entries = ctsio->kern_sg_entries; 190 } else { 191 kern_sglist = &kern_entry; 192 kern_sglist->addr = ctsio->kern_data_ptr; 193 kern_sglist->len = ctsio->kern_data_len; 194 kern_sg_entries = 1; 195 } 196 197 kern_watermark = 0; 198 ext_watermark = ext_offset; 199 for (i = ext_sg_start, j = 0; 200 i < ext_sg_entries && j < kern_sg_entries;) { 201 uint8_t *ext_ptr, *kern_ptr; 202 203 len_to_copy = min(ext_sglist[i].len - ext_watermark, 204 kern_sglist[j].len - kern_watermark); 205 206 ext_ptr = (uint8_t *)ext_sglist[i].addr; 207 ext_ptr = ext_ptr + ext_watermark; 208 if (io->io_hdr.flags & CTL_FLAG_BUS_ADDR) { 209 /* 210 * XXX KDM fix this! 211 */ 212 panic("need to implement bus address support"); 213 #if 0 214 kern_ptr = bus_to_virt(kern_sglist[j].addr); 215 #endif 216 } else 217 kern_ptr = (uint8_t *)kern_sglist[j].addr; 218 kern_ptr = kern_ptr + kern_watermark; 219 220 if ((ctsio->io_hdr.flags & CTL_FLAG_DATA_MASK) == 221 CTL_FLAG_DATA_IN) { 222 CTL_DEBUG_PRINT(("%s: copying %d bytes to user\n", 223 __func__, len_to_copy)); 224 CTL_DEBUG_PRINT(("%s: from %p to %p\n", __func__, 225 kern_ptr, ext_ptr)); 226 memcpy(ext_ptr, kern_ptr, len_to_copy); 227 } else { 228 CTL_DEBUG_PRINT(("%s: copying %d bytes from user\n", 229 __func__, len_to_copy)); 230 CTL_DEBUG_PRINT(("%s: from %p to %p\n", __func__, 231 ext_ptr, kern_ptr)); 232 memcpy(kern_ptr, ext_ptr, len_to_copy); 233 } 234 235 ctsio->ext_data_filled += len_to_copy; 236 ctsio->kern_data_resid -= len_to_copy; 237 238 ext_watermark += len_to_copy; 239 if (ext_sglist[i].len == ext_watermark) { 240 i++; 241 ext_watermark = 0; 242 } 243 244 kern_watermark += len_to_copy; 245 if (kern_sglist[j].len == kern_watermark) { 246 j++; 247 kern_watermark = 0; 248 } 249 } 250 251 CTL_DEBUG_PRINT(("%s: ext_sg_entries: %d, kern_sg_entries: %d\n", 252 __func__, ext_sg_entries, kern_sg_entries)); 253 CTL_DEBUG_PRINT(("%s: ext_data_len = %d, kern_data_len = %d\n", 254 __func__, ctsio->ext_data_len, ctsio->kern_data_len)); 255 256 bailout: 257 ctl_datamove_done(io, true); 258 } 259 260 static void 261 tpcl_done(union ctl_io *io) 262 { 263 264 tpc_done(io); 265 } 266 267 uint64_t 268 tpcl_resolve(struct ctl_softc *softc, int init_port, 269 struct scsi_ec_cscd *cscd, uint32_t *ss, uint32_t *ps, uint32_t *pso) 270 { 271 struct scsi_ec_cscd_id *cscdid; 272 struct ctl_port *port; 273 struct ctl_lun *lun; 274 uint64_t lunid = UINT64_MAX; 275 276 if (cscd->type_code != EC_CSCD_ID || 277 (cscd->luidt_pdt & EC_LUIDT_MASK) != EC_LUIDT_LUN || 278 (cscd->luidt_pdt & EC_NUL) != 0) 279 return (lunid); 280 281 cscdid = (struct scsi_ec_cscd_id *)cscd; 282 mtx_lock(&softc->ctl_lock); 283 if (init_port >= 0) 284 port = softc->ctl_ports[init_port]; 285 else 286 port = NULL; 287 STAILQ_FOREACH(lun, &softc->lun_list, links) { 288 if (port != NULL && 289 ctl_lun_map_to_port(port, lun->lun) == UINT32_MAX) 290 continue; 291 if (lun->lun_devid == NULL) 292 continue; 293 if (scsi_devid_match(lun->lun_devid->data, 294 lun->lun_devid->len, &cscdid->codeset, 295 cscdid->length + 4) == 0) { 296 lunid = lun->lun; 297 if (ss) 298 *ss = lun->be_lun->blocksize; 299 if (ps) 300 *ps = lun->be_lun->blocksize << 301 lun->be_lun->pblockexp; 302 if (pso) 303 *pso = lun->be_lun->blocksize * 304 lun->be_lun->pblockoff; 305 break; 306 } 307 } 308 mtx_unlock(&softc->ctl_lock); 309 return (lunid); 310 }; 311 312 union ctl_io * 313 tpcl_alloc_io(void) 314 { 315 struct tpcl_softc *tsoftc = &tpcl_softc; 316 317 return (ctl_alloc_io(tsoftc->port.ctl_pool_ref)); 318 }; 319 320 int 321 tpcl_queue(union ctl_io *io, uint64_t lun) 322 { 323 struct tpcl_softc *tsoftc = &tpcl_softc; 324 325 io->io_hdr.nexus.initid = 0; 326 io->io_hdr.nexus.targ_port = tsoftc->port.targ_port; 327 io->io_hdr.nexus.targ_lun = lun; 328 io->scsiio.tag_num = atomic_fetchadd_int(&tsoftc->cur_tag_num, 1); 329 io->scsiio.ext_data_filled = 0; 330 return (ctl_queue(io)); 331 } 332