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2f1afc88 | 1 | /* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
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5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
a5a0310d UD |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
a5a0310d | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
a5a0310d UD |
17 | |
18 | /* | |
19 | History: | |
20 | Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user | |
21 | process control of SCSI devices. | |
22 | Development Sponsored by Killy Corp. NY NY | |
23 | */ | |
24 | ||
25 | #ifndef _SCSI_SG_H | |
26 | #define _SCSI_SG_H 1 | |
27 | ||
bc526b60 UD |
28 | #include <features.h> |
29 | ||
a5a0310d | 30 | |
2f1afc88 UD |
31 | /* New interface introduced in the 3.x SG drivers follows */ |
32 | ||
33 | /* Same structure as used by readv() Linux system call. It defines one | |
34 | scatter-gather element. */ | |
35 | typedef struct sg_iovec | |
5d141597 | 36 | { |
2f1afc88 UD |
37 | void * iov_base; /* Starting address */ |
38 | size_t iov_len; /* Length in bytes */ | |
39 | } sg_iovec_t; | |
40 | ||
41 | ||
42 | typedef struct sg_io_hdr | |
43 | { | |
5d141597 UD |
44 | int interface_id; /* [i] 'S' for SCSI generic (required) */ |
45 | int dxfer_direction; /* [i] data transfer direction */ | |
2f1afc88 | 46 | unsigned char cmd_len; /* [i] SCSI command length ( <= 16 bytes) */ |
2f1afc88 | 47 | unsigned char mx_sb_len; /* [i] max length to write to sbp */ |
5d141597 | 48 | unsigned short int iovec_count; /* [i] 0 implies no scatter gather */ |
2f1afc88 UD |
49 | unsigned int dxfer_len; /* [i] byte count of data transfer */ |
50 | void * dxferp; /* [i], [*io] points to data transfer memory | |
51 | or scatter gather list */ | |
52 | unsigned char * cmdp; /* [i], [*i] points to command to perform */ | |
53 | unsigned char * sbp; /* [i], [*o] points to sense_buffer memory */ | |
54 | unsigned int timeout; /* [i] MAX_UINT->no timeout (unit: millisec) */ | |
55 | unsigned int flags; /* [i] 0 -> default, see SG_FLAG... */ | |
56 | int pack_id; /* [i->o] unused internally (normally) */ | |
57 | void * usr_ptr; /* [i->o] unused internally */ | |
58 | unsigned char status; /* [o] scsi status */ | |
59 | unsigned char masked_status;/* [o] shifted, masked scsi status */ | |
60 | unsigned char msg_status; /* [o] messaging level data (optional) */ | |
61 | unsigned char sb_len_wr; /* [o] byte count actually written to sbp */ | |
62 | unsigned short int host_status; /* [o] errors from host adapter */ | |
63 | unsigned short int driver_status;/* [o] errors from software driver */ | |
64 | int resid; /* [o] dxfer_len - actual_transferred */ | |
65 | unsigned int duration; /* [o] time taken by cmd (unit: millisec) */ | |
66 | unsigned int info; /* [o] auxiliary information */ | |
67 | } sg_io_hdr_t; | |
68 | ||
69 | ||
70 | /* Use negative values to flag difference from original sg_header structure. */ | |
71 | #define SG_DXFER_NONE -1 /* e.g. a SCSI Test Unit Ready command */ | |
72 | #define SG_DXFER_TO_DEV -2 /* e.g. a SCSI WRITE command */ | |
73 | #define SG_DXFER_FROM_DEV -3 /* e.g. a SCSI READ command */ | |
74 | #define SG_DXFER_TO_FROM_DEV -4 /* treated like SG_DXFER_FROM_DEV with the | |
75 | additional property than during indirect | |
76 | IO the user buffer is copied into the | |
77 | kernel buffers before the transfer */ | |
78 | ||
79 | ||
80 | /* following flag values can be "or"-ed together */ | |
81 | #define SG_FLAG_DIRECT_IO 1 /* default is indirect IO */ | |
82 | #define SG_FLAG_LUN_INHIBIT 2 /* default is to put device's lun into */ | |
83 | /* the 2nd byte of SCSI command */ | |
84 | #define SG_FLAG_NO_DXFER 0x10000 /* no transfer of kernel buffers to/from */ | |
85 | /* user space (debug indirect IO) */ | |
86 | ||
87 | /* The following 'info' values are "or"-ed together. */ | |
88 | #define SG_INFO_OK_MASK 0x1 | |
89 | #define SG_INFO_OK 0x0 /* no sense, host nor driver "noise" */ | |
90 | #define SG_INFO_CHECK 0x1 /* something abnormal happened */ | |
91 | ||
92 | #define SG_INFO_DIRECT_IO_MASK 0x6 | |
93 | #define SG_INFO_INDIRECT_IO 0x0 /* data xfer via kernel buffers (or no xfer) */ | |
94 | #define SG_INFO_DIRECT_IO 0x2 /* direct IO requested and performed */ | |
95 | #define SG_INFO_MIXED_IO 0x4 /* part direct, part indirect IO */ | |
96 | ||
97 | ||
98 | /* Request information about a specific SG device, used by | |
99 | SG_GET_SCSI_ID ioctl (). */ | |
100 | struct sg_scsi_id { | |
101 | /* Host number as in "scsi<n>" where 'n' is one of 0, 1, 2 etc. */ | |
102 | int host_no; | |
103 | int channel; | |
104 | /* SCSI id of target device. */ | |
105 | int scsi_id; | |
106 | int lun; | |
107 | /* TYPE_... defined in <scsi/scsi.h>. */ | |
108 | int scsi_type; | |
109 | /* Host (adapter) maximum commands per lun. */ | |
110 | short int h_cmd_per_lun; | |
111 | /* Device (or adapter) maximum queue length. */ | |
112 | short int d_queue_depth; | |
113 | /* Unused, set to 0 for now. */ | |
114 | int unused[2]; | |
115 | }; | |
116 | ||
117 | /* Used by SG_GET_REQUEST_TABLE ioctl(). */ | |
118 | typedef struct sg_req_info { | |
119 | char req_state; /* 0 -> not used, 1 -> written, 2 -> ready to read */ | |
120 | char orphan; /* 0 -> normal request, 1 -> from interruped SG_IO */ | |
121 | char sg_io_owned; /* 0 -> complete with read(), 1 -> owned by SG_IO */ | |
122 | char problem; /* 0 -> no problem detected, 1 -> error to report */ | |
123 | int pack_id; /* pack_id associated with request */ | |
124 | void * usr_ptr; /* user provided pointer (in new interface) */ | |
125 | unsigned int duration; /* millisecs elapsed since written (req_state==1) | |
126 | or request duration (req_state==2) */ | |
127 | int unused; | |
128 | } sg_req_info_t; | |
129 | ||
130 | ||
131 | /* IOCTLs: Those ioctls that are relevant to the SG 3.x drivers follow. | |
132 | [Those that only apply to the SG 2.x drivers are at the end of the file.] | |
133 | (_GET_s yield result via 'int *' 3rd argument unless otherwise indicated) */ | |
134 | ||
135 | #define SG_EMULATED_HOST 0x2203 /* true for emulated host adapter (ATAPI) */ | |
136 | ||
137 | /* Used to configure SCSI command transformation layer for ATAPI devices */ | |
138 | /* Only supported by the ide-scsi driver */ | |
139 | #define SG_SET_TRANSFORM 0x2204 /* N.B. 3rd arg is not pointer but value: */ | |
140 | /* 3rd arg = 0 to disable transform, 1 to enable it */ | |
141 | #define SG_GET_TRANSFORM 0x2205 | |
142 | ||
143 | #define SG_SET_RESERVED_SIZE 0x2275 /* request a new reserved buffer size */ | |
144 | #define SG_GET_RESERVED_SIZE 0x2272 /* actual size of reserved buffer */ | |
145 | ||
146 | /* The following ioctl has a 'sg_scsi_id_t *' object as its 3rd argument. */ | |
147 | #define SG_GET_SCSI_ID 0x2276 /* Yields fd's bus, chan, dev, lun + type */ | |
148 | /* SCSI id information can also be obtained from SCSI_IOCTL_GET_IDLUN */ | |
149 | ||
150 | /* Override host setting and always DMA using low memory ( <16MB on i386) */ | |
151 | #define SG_SET_FORCE_LOW_DMA 0x2279 /* 0-> use adapter setting, 1-> force */ | |
152 | #define SG_GET_LOW_DMA 0x227a /* 0-> use all ram for dma; 1-> low dma ram */ | |
153 | ||
154 | /* When SG_SET_FORCE_PACK_ID set to 1, pack_id is input to read() which | |
155 | tries to fetch a packet with a matching pack_id, waits, or returns EAGAIN. | |
156 | If pack_id is -1 then read oldest waiting. When ...FORCE_PACK_ID set to 0 | |
157 | then pack_id ignored by read() and oldest readable fetched. */ | |
158 | #define SG_SET_FORCE_PACK_ID 0x227b | |
159 | #define SG_GET_PACK_ID 0x227c /* Yields oldest readable pack_id (or -1) */ | |
160 | ||
161 | #define SG_GET_NUM_WAITING 0x227d /* Number of commands awaiting read() */ | |
162 | ||
163 | /* Yields max scatter gather tablesize allowed by current host adapter */ | |
164 | #define SG_GET_SG_TABLESIZE 0x227F /* 0 implies can't do scatter gather */ | |
165 | ||
166 | #define SG_GET_VERSION_NUM 0x2282 /* Example: version 2.1.34 yields 20134 */ | |
167 | ||
5d141597 | 168 | /* Returns -EBUSY if occupied. 3rd argument pointer to int (see next) */ |
2f1afc88 | 169 | #define SG_SCSI_RESET 0x2284 |
5d141597 UD |
170 | /* Associated values that can be given to SG_SCSI_RESET follow */ |
171 | #define SG_SCSI_RESET_NOTHING 0 | |
172 | #define SG_SCSI_RESET_DEVICE 1 | |
173 | #define SG_SCSI_RESET_BUS 2 | |
174 | #define SG_SCSI_RESET_HOST 3 | |
2f1afc88 UD |
175 | |
176 | /* synchronous SCSI command ioctl, (only in version 3 interface) */ | |
177 | #define SG_IO 0x2285 /* similar effect as write() followed by read() */ | |
178 | ||
179 | #define SG_GET_REQUEST_TABLE 0x2286 /* yields table of active requests */ | |
180 | ||
181 | /* How to treat EINTR during SG_IO ioctl(), only in SG 3.x series */ | |
182 | #define SG_SET_KEEP_ORPHAN 0x2287 /* 1 -> hold for read(), 0 -> drop (def) */ | |
183 | #define SG_GET_KEEP_ORPHAN 0x2288 | |
184 | ||
185 | ||
186 | #define SG_SCATTER_SZ (8 * 4096) /* PAGE_SIZE not available to user */ | |
187 | /* Largest size (in bytes) a single scatter-gather list element can have. | |
188 | The value must be a power of 2 and <= (PAGE_SIZE * 32) [131072 bytes on | |
189 | i386]. The minimum value is PAGE_SIZE. If scatter-gather not supported | |
190 | by adapter then this value is the largest data block that can be | |
191 | read/written by a single scsi command. The user can find the value of | |
192 | PAGE_SIZE by calling getpagesize() defined in unistd.h . */ | |
193 | ||
194 | #define SG_DEFAULT_RETRIES 1 | |
195 | ||
196 | /* Defaults, commented if they differ from original sg driver */ | |
197 | #define SG_DEF_FORCE_LOW_DMA 0 /* was 1 -> memory below 16MB on i386 */ | |
198 | #define SG_DEF_FORCE_PACK_ID 0 | |
199 | #define SG_DEF_KEEP_ORPHAN 0 | |
200 | #define SG_DEF_RESERVED_SIZE SG_SCATTER_SZ /* load time option */ | |
201 | ||
202 | /* maximum outstanding requests, write() yields EDOM if exceeded */ | |
203 | #define SG_MAX_QUEUE 16 | |
204 | ||
205 | #define SG_BIG_BUFF SG_DEF_RESERVED_SIZE /* for backward compatibility */ | |
206 | ||
207 | /* Alternate style type names, "..._t" variants preferred */ | |
208 | typedef struct sg_io_hdr Sg_io_hdr; | |
209 | typedef struct sg_io_vec Sg_io_vec; | |
210 | typedef struct sg_scsi_id Sg_scsi_id; | |
211 | typedef struct sg_req_info Sg_req_info; | |
212 | ||
213 | ||
214 | /* vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv */ | |
215 | /* The older SG interface based on the 'sg_header' structure follows. */ | |
216 | /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */ | |
217 | ||
218 | #define SG_MAX_SENSE 16 /* this only applies to the sg_header interface */ | |
844633d1 | 219 | |
a5a0310d UD |
220 | struct sg_header |
221 | { | |
844633d1 UD |
222 | /* Length of incoming packet (including header). */ |
223 | int pack_len; | |
224 | /* Maximal length of expected reply. */ | |
225 | int reply_len; | |
226 | /* Id number of packet. */ | |
227 | int pack_id; | |
228 | /* 0==ok, otherwise error number. */ | |
229 | int result; | |
230 | /* Force 12 byte command length for group 6 & 7 commands. */ | |
231 | unsigned int twelve_byte:1; | |
232 | /* SCSI status from target. */ | |
233 | unsigned int target_status:5; | |
234 | /* Host status (see "DID" codes). */ | |
235 | unsigned int host_status:8; | |
236 | /* Driver status+suggestion. */ | |
237 | unsigned int driver_status:8; | |
238 | /* Unused. */ | |
239 | unsigned int other_flags:10; | |
240 | /* Output in 3 cases: | |
241 | when target_status is CHECK_CONDITION or | |
242 | when target_status is COMMAND_TERMINATED or | |
243 | when (driver_status & DRIVER_SENSE) is true. */ | |
244 | unsigned char sense_buffer[SG_MAX_SENSE]; | |
a5a0310d UD |
245 | }; |
246 | ||
844633d1 | 247 | |
2f1afc88 | 248 | /* IOCTLs: The following are not required (or ignored) when the sg_io_hdr_t |
5d141597 | 249 | interface is used. They are kept for backward compatibility with |
2f1afc88 UD |
250 | the original and version 2 drivers. */ |
251 | ||
844633d1 UD |
252 | #define SG_SET_TIMEOUT 0x2201 /* Set timeout; *(int *)arg==timeout. */ |
253 | #define SG_GET_TIMEOUT 0x2202 /* Get timeout; return timeout. */ | |
254 | ||
844633d1 UD |
255 | /* Get/set command queuing state per fd (default is SG_DEF_COMMAND_Q). */ |
256 | #define SG_GET_COMMAND_Q 0x2270 /* Yields 0 (queuing off) or 1 (on). */ | |
257 | #define SG_SET_COMMAND_Q 0x2271 /* Change queuing state with 0 or 1. */ | |
258 | ||
2f1afc88 UD |
259 | /* Turn on error sense trace (1..8), dump this device to log/console (9) |
260 | or dump all sg device states ( >9 ) to log/console. */ | |
261 | #define SG_SET_DEBUG 0x227e /* 0 -> turn off debug */ | |
844633d1 | 262 | |
844633d1 UD |
263 | #define SG_NEXT_CMD_LEN 0x2283 /* Override SCSI command length with given |
264 | number on the next write() on this file | |
265 | descriptor. */ | |
266 | ||
844633d1 | 267 | /* Defaults, commented if they differ from original sg driver */ |
2f1afc88 UD |
268 | #define SG_DEFAULT_TIMEOUT (60*HZ) /* HZ == 'jiffies in 1 second' */ |
269 | #define SG_DEF_COMMAND_Q 0 /* command queuing is always on when | |
270 | the new interface is used */ | |
271 | #define SG_DEF_UNDERRUN_FLAG 0 | |
272 | ||
a5a0310d UD |
273 | |
274 | #endif /* scsi/sg.h */ |