1 /* $NetBSD: isp_tpublic.h,v 1.7 2001/05/16 03:58:03 mjacob Exp $ */ 2 /* 3 * This driver, which is contained in NetBSD in the files: 4 * 5 * sys/dev/ic/isp.c 6 * sys/dev/ic/isp_inline.h 7 * sys/dev/ic/isp_netbsd.c 8 * sys/dev/ic/isp_netbsd.h 9 * sys/dev/ic/isp_target.c 10 * sys/dev/ic/isp_target.h 11 * sys/dev/ic/isp_tpublic.h 12 * sys/dev/ic/ispmbox.h 13 * sys/dev/ic/ispreg.h 14 * sys/dev/ic/ispvar.h 15 * sys/microcode/isp/asm_sbus.h 16 * sys/microcode/isp/asm_1040.h 17 * sys/microcode/isp/asm_1080.h 18 * sys/microcode/isp/asm_12160.h 19 * sys/microcode/isp/asm_2100.h 20 * sys/microcode/isp/asm_2200.h 21 * sys/pci/isp_pci.c 22 * sys/sbus/isp_sbus.c 23 * 24 * Is being actively maintained by Matthew Jacob (mjacob@netbsd.org). 25 * This driver also is shared source with FreeBSD, OpenBSD, Linux, Solaris, 26 * Linux versions. This tends to be an interesting maintenance problem. 27 * 28 * Please coordinate with Matthew Jacob on changes you wish to make here. 29 */ 30 /* 31 * Qlogic ISP Host Adapter Public Target Interface Structures && Routines 32 *--------------------------------------- 33 * Copyright (c) 2000 by Matthew Jacob 34 * All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions, and the following disclaimer, 41 * without modification, immediately at the beginning of the file. 42 * 2. The name of the author may not be used to endorse or promote products 43 * derived from this software without specific prior written permission. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 49 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 * 57 * Matthew Jacob 58 * Feral Software 59 * mjacob@feral.com 60 */ 61 62 /* 63 * Required software target mode message and event handling structures. 64 * 65 * The message and event structures are used by the MI layer 66 * to propagate messages and events upstream. 67 */ 68 69 #ifndef IN_MSGLEN 70 #define IN_MSGLEN 8 71 #endif 72 typedef struct { 73 void * nt_hba; /* HBA tag */ 74 u_int64_t nt_iid; /* inititator id */ 75 u_int64_t nt_tgt; /* target id */ 76 u_int64_t nt_lun; /* logical unit */ 77 u_int8_t nt_bus; /* bus */ 78 u_int8_t nt_tagtype; /* tag type */ 79 u_int16_t nt_tagval; /* tag value */ 80 u_int8_t nt_msg[IN_MSGLEN]; /* message content */ 81 } tmd_msg_t; 82 83 typedef struct { 84 void * ev_hba; /* HBA tag */ 85 u_int16_t ev_bus; /* bus */ 86 u_int16_t ev_event; /* type of async event */ 87 } tmd_event_t; 88 89 /* 90 * Suggested Software Target Mode Command Handling structure. 91 * 92 * A note about terminology: 93 * 94 * MD stands for "Machine Dependent". 95 * 96 * This driver is structured in three layers: Outer MD, core, and inner MD. 97 * The latter also is bus dependent (i.e., is cognizant of PCI bus issues 98 * as well as platform issues). 99 * 100 * 101 * "Outer Layer" means "Other Module" 102 * 103 * Some additional module that actually implements SCSI target command 104 * policy is the recipient of incoming commands and the source of the 105 * disposition for them. 106 * 107 * The command structure below is one suggested possible MD command structure, 108 * but since the handling of thbis is entirely in the MD layer, there is 109 * no explicit or implicit requirement that it be used. 110 * 111 * The cd_private tag should be used by the MD layer to keep a free list 112 * of these structures. Code outside of this driver can then use this 113 * as an to identify it's own unit structures. That is, when not on the MD 114 * layer's freelist, the MD layer should shove into it the identifier 115 * that the outer layer has for it- passed in on an initial QIN_HBA_REG 116 * call (see below). 117 * 118 * The cd_hba tag is a tag that uniquely identifies the HBA this target 119 * mode command is coming from. The outer layer has to pass this back 120 * unchanged to avoid chaos. 121 * 122 * The cd_iid, cd_tgt, cd_lun and cd_bus tags are used to identify the 123 * id of the initiator who sent us a command, the target claim to be, the 124 * lun on the target we claim to be, and the bus instance (for multiple 125 * bus host adapters) that this applies to (consider it an extra Port 126 * parameter). The iid, tgt and lun values are deliberately chosen to be 127 * fat so that, for example, World Wide Names can be used instead of 128 * the units that the Qlogic firmware uses (in the case where the MD 129 * layer maintains a port database, for example). 130 * 131 * The cd_tagtype field specifies what kind of command tag has been 132 * sent with the command. The cd_tagval is the tag's value (low 16 133 * bits). It also contains (in the upper 16 bits) any command handle. 134 * 135 * 136 * N.B.: when the MD layer sends this command to outside software 137 * the outside software likely *MUST* return the same cd_tagval that 138 * was in place because this value is likely what the Qlogic f/w uses 139 * to identify a command. 140 * 141 * The cd_cdb contains storage for the passed in command descriptor block. 142 * This is the maximum size we can get out of the Qlogic f/w. There's no 143 * passed in length because whoever decodes the command to act upon it 144 * will know what the appropriate length is. 145 * 146 * The tag cd_lflags are the flags set by the MD driver when it gets 147 * command incoming or when it needs to inform any outside entities 148 * that the last requested action failed. 149 * 150 * The tag cd_hflags should be set by any outside software to indicate 151 * the validity of sense and status fields (defined below) and to indicate 152 * the direction data is expected to move. It is an error to have both 153 * CDFH_DATA_IN and CDFH_DATA_OUT set. 154 * 155 * If the CDFH_STSVALID flag is set, the command should be completed (after 156 * sending any data and/or status). If CDFH_SNSVALID is set and the MD layer 157 * can also handle sending the associated sense data (either back with an 158 * FCP RESPONSE IU for Fibre Channel or otherwise automatically handling a 159 * REQUEST SENSE from the initator for this target/lun), the MD layer will 160 * set the CDFL_SENTSENSE flag on successful transmission of the sense data. 161 * It is an error for the CDFH_SNSVALID bit to be set and CDFH_STSVALID not 162 * to be set. It is an error for the CDFH_SNSVALID be set and the associated 163 * SCSI status (cd_scsi_status) not be set to CHECK CONDITON. 164 * 165 * The tag cd_data points to a data segment to either be filled or 166 * read from depending on the direction of data movement. The tag 167 * is undefined if no data direction is set. The MD layer and outer 168 * layers must agree on the meaning of cd_data. 169 * 170 * The tag cd_totlen is the total data amount expected to be moved 171 * over the life of the command. It *may* be set by the MD layer, possibly 172 * from the datalen field of an FCP CMND IU unit. If it shows up in the outer 173 * layers set to zero and the CDB indicates data should be moved, the outer 174 * layer should set it to the amount expected to be moved. 175 * 176 * The tag cd_resid should be the total residual of data not transferred. 177 * The outer layers need to set this at the begining of command processing 178 * to equal cd_totlen. As data is successfully moved, this value is decreased. 179 * At the end of a command, any nonzero residual indicates the number of bytes 180 * requested but not moved. XXXXXXXXXXXXXXXXXXXXXXX TOO VAGUE!!! 181 * 182 * The tag cd_xfrlen is the length of the currently active data transfer. 183 * This allows several interations between any outside software and the 184 * MD layer to move data. 185 * 186 * The reason that total length and total residual have to be tracked 187 * is that fibre channel FCP DATA IU units have to have a relative 188 * offset field. 189 * 190 * N.B.: there is no necessary 1-to-1 correspondence between any one 191 * data transfer segment and the number of CTIOs that will be generated 192 * satisfy the current data transfer segment. It's not also possible to 193 * predict how big a transfer can be before it will be 'too big'. Be 194 * reasonable- a 64KB transfer is 'reasonable'. A 1MB transfer may not 195 * be. A 32MB transfer is unreasonable. The problem here has to do with 196 * how CTIOs can be used to map passed data pointers. In systems which 197 * have page based scatter-gather requirements, each PAGESIZEd chunk will 198 * consume one data segment descriptor- you get 3 or 4 of them per CTIO. 199 * The size of the REQUEST QUEUE you drop a CTIO onto is finite (typically 200 * it's 256, but on some systems it's even smaller, and note you have to 201 * sure this queue with the initiator side of this driver). 202 * 203 * The tags cd_sense and cd_scsi_status are pretty obvious. 204 * 205 * The tag cd_error is to communicate between the MD layer and outer software 206 * the current error conditions. 207 * 208 * The tag cd_reserved pads out the structure to 128 bytes. The first 209 * half of the pad area is reserved to the MD layer, and the second half 210 * may be used by outer layers, for scratch purposes. 211 */ 212 213 #ifndef _LP64 214 #if defined(__alpha__) || defined(__sparcv9cpu) || defined(__sparc_v9__) 215 #define _LP64 216 #endif 217 #endif 218 219 #ifndef _TMD_PAD_LEN 220 #ifdef _LP64 221 #define _TMD_PAD_LEN 12 222 #else 223 #define _TMD_PAD_LEN 24 224 #endif 225 #endif 226 #ifndef ATIO_CDBLEN 227 #define ATIO_CDBLEN 26 228 #endif 229 #ifndef QLTM_SENSELEN 230 #define QLTM_SENSELEN 18 231 #endif 232 typedef struct tmd_cmd { 233 void * cd_private; /* layer private data */ 234 void * cd_hba; /* HBA tag */ 235 void * cd_data; /* 'pointer' to data */ 236 u_int64_t cd_iid; /* initiator ID */ 237 u_int64_t cd_tgt; /* target id */ 238 u_int64_t cd_lun; /* logical unit */ 239 u_int8_t cd_bus; /* bus */ 240 u_int8_t cd_tagtype; /* tag type */ 241 u_int32_t cd_tagval; /* tag value */ 242 u_int8_t cd_cdb[ATIO_CDBLEN]; /* Command */ 243 u_int8_t cd_lflags; /* flags lower level sets */ 244 u_int8_t cd_hflags; /* flags higher level sets */ 245 u_int32_t cd_totlen; /* total data requirement */ 246 u_int32_t cd_resid; /* total data residual */ 247 u_int32_t cd_xfrlen; /* current data requirement */ 248 int32_t cd_error; /* current error */ 249 u_int8_t cd_sense[QLTM_SENSELEN]; 250 u_int16_t cd_scsi_status; /* closing SCSI status */ 251 u_int8_t cd_reserved[_TMD_PAD_LEN]; 252 } tmd_cmd_t; 253 254 #define CDFL_SNSVALID 0x01 /* sense data (from f/w) valid */ 255 #define CDFL_NODISC 0x02 /* disconnects disabled */ 256 #define CDFL_SENTSENSE 0x04 /* last action sent sense data */ 257 #define CDFL_SENTSTATUS 0x08 /* last action sent status */ 258 #define CDFL_ERROR 0x10 /* last action ended in error */ 259 #define CDFL_BUSY 0x40 /* this command is not on a free list */ 260 #define CDFL_PRIVATE_0 0x80 /* private layer flags */ 261 262 #define CDFH_SNSVALID 0x01 /* sense data valid */ 263 #define CDFH_STSVALID 0x02 /* status valid */ 264 #define CDFH_NODATA 0x00 /* no data transfer expected */ 265 #define CDFH_DATA_IN 0x04 /* target (us) -> initiator (them) */ 266 #define CDFH_DATA_OUT 0x08 /* initiator (them) -> target (us) */ 267 #define CDFH_DATA_MASK 0x0C /* mask to cover data direction */ 268 #define CDFH_PRIVATE_0 0x80 /* private layer flags */ 269 270 /* 271 * Action codes set by the Qlogic MD target driver for 272 * the external layer to figure out what to do with. 273 */ 274 typedef enum { 275 QOUT_HBA_REG=0, /* the argument is a pointer to a hba_register_t */ 276 QOUT_TMD_START, /* the argument is a pointer to a tmd_cmd_t */ 277 QOUT_TMD_DONE, /* the argument is a pointer to a tmd_cmd_t */ 278 QOUT_TEVENT, /* the argument is a pointer to a tmd_event_t */ 279 QOUT_TMSG, /* the argument is a pointer to a tmd_msg_t */ 280 QOUT_HBA_UNREG /* the argument is a pointer to a hba_register_t */ 281 } tact_e; 282 283 /* 284 * Action codes set by the external layer for the 285 * MD Qlogic driver to figure out what to do with. 286 */ 287 typedef enum { 288 QIN_HBA_REG=6, /* the argument is a pointer to a hba_register_t */ 289 QIN_ENABLE, /* the argument is a pointer to a tmd_cmd_t */ 290 QIN_DISABLE, /* the argument is a pointer to a tmd_cmd_t */ 291 QIN_TMD_CONT, /* the argument is a pointer to a tmd_cmd_t */ 292 QIN_TMD_FIN, /* the argument is a pointer to a done tmd_cmd_t */ 293 QIN_HBA_UNREG /* the argument is a pointer to a hba_register_t */ 294 } qact_e; 295 296 /* 297 * A word about the START/CONT/DONE/FIN dance: 298 * 299 * When the HBA is enabled for receiving commands, one may show up 300 * without notice. When that happens, the Qlogic target mode driver 301 * gets a tmd_cmd_t, fills it with the info that just arrived, and 302 * calls the outer layer with a QOUT_TMD_START code and pointer to 303 * the tmd_cmd_t. 304 * 305 * The outer layer decodes the command, fetches data, prepares stuff, 306 * whatever, and starts by passing back the pointer with a QIN_TMD_CONT 307 * code which causes the Qlogic target mode driver to generate CTIOs to 308 * satisfy whatever action needs to be taken. When those CTIOs complete, 309 * the Qlogic target driver sends the pointer to the cmd_tmd_t back with 310 * a QOUT_TMD_DONE code. This repeats for as long as necessary. 311 * 312 * The outer layer signals it wants to end the command by settings within 313 * the tmd_cmd_t itself. When the final QIN_TMD_CONT is reported completed, 314 * the outer layer frees the tmd_cmd_t by sending the pointer to it 315 * back with a QIN_TMD_FIN code. 316 * 317 * The graph looks like: 318 * 319 * QOUT_TMD_START -> [ QIN_TMD_CONT -> QOUT_TMD_DONE ] * -> QIN_TMD_FIN. 320 * 321 */ 322 323 /* 324 * A word about ENABLE/DISABLE: the argument is a pointer to an tmd_cmd_t 325 * with cd_hba, cd_bus, cd_tgt and cd_lun filled out. If an error occurs 326 * in either enabling or disabling the described lun, cd_lflags is set 327 * with CDFL_ERROR. 328 * 329 * Logical unit zero must be the first enabled and the last disabled. 330 */ 331 332 /* 333 * Target handler functions. 334 * The MD target handler function (the outer layer calls this) 335 * should be be prototyped like: 336 * 337 * void target_action(qact_e, void *arg) 338 * 339 * The outer layer target handler function (the MD layer calls this) 340 * should be be prototyped like: 341 * 342 * void system_action(tact_e, void *arg) 343 */ 344 345 /* 346 * This structure is used to register to other software modules the 347 * binding of an HBA identifier, driver name and instance and the 348 * lun width capapbilities of this target driver. It's up to each 349 * platform to figure out how it wants to do this, but a typical 350 * sequence would be for the MD layer to find some external module's 351 * entry point and start by sending a QOUT_HBA_REG with info filled 352 * in, and the external module to call back with a QIN_HBA_REG that 353 * passes back the corresponding information. 354 */ 355 typedef struct { 356 void * r_identity; 357 char r_name[8]; 358 int r_inst; 359 int r_lunwidth; 360 int r_buswidth; 361 void (*r_action)(int, void *); 362 } hba_register_t; 363