2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Bugreports.to..: <Linux390@de.ibm.com>
4 * Copyright IBM Corp. 1999, 2000
5 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
6 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
8 * This file is the interface of the DASD device driver, which is exported to user space
9 * any future changes wrt the API will result in a change of the APIVERSION reported
10 * to userspace by the DASDAPIVER-ioctl
16 #include <linux/types.h>
17 #include <linux/ioctl.h>
19 #define DASD_IOCTL_LETTER 'D'
21 #define DASD_API_VERSION 6
24 * struct dasd_information2_t
25 * represents any data about the device, which is visible to userspace.
26 * including foramt and featueres.
28 typedef struct dasd_information2_t {
29 unsigned int devno; /* S/390 devno */
30 unsigned int real_devno; /* for aliases */
31 unsigned int schid; /* S/390 subchannel identifier */
32 unsigned int cu_type : 16; /* from SenseID */
33 unsigned int cu_model : 8; /* from SenseID */
34 unsigned int dev_type : 16; /* from SenseID */
35 unsigned int dev_model : 8; /* from SenseID */
36 unsigned int open_count;
37 unsigned int req_queue_len;
38 unsigned int chanq_len; /* length of chanq */
39 char type[4]; /* from discipline.name, 'none' for unknown */
40 unsigned int status; /* current device level */
41 unsigned int label_block; /* where to find the VOLSER */
42 unsigned int FBA_layout; /* fixed block size (like AIXVOL) */
43 unsigned int characteristics_size;
44 unsigned int confdata_size;
45 char characteristics[64]; /* from read_device_characteristics */
46 char configuration_data[256]; /* from read_configuration_data */
47 unsigned int format; /* format info like formatted/cdl/ldl/... */
48 unsigned int features; /* dasd features like 'ro',... */
49 unsigned int reserved0; /* reserved for further use ,... */
50 unsigned int reserved1; /* reserved for further use ,... */
51 unsigned int reserved2; /* reserved for further use ,... */
52 unsigned int reserved3; /* reserved for further use ,... */
53 unsigned int reserved4; /* reserved for further use ,... */
54 unsigned int reserved5; /* reserved for further use ,... */
55 unsigned int reserved6; /* reserved for further use ,... */
56 unsigned int reserved7; /* reserved for further use ,... */
57 } dasd_information2_t;
60 * values to be used for dasd_information_t.format
62 * 0x01: Linux disc layout
63 * 0x02: Common disc layout
65 #define DASD_FORMAT_NONE 0
66 #define DASD_FORMAT_LDL 1
67 #define DASD_FORMAT_CDL 2
69 * values to be used for dasd_information_t.features
70 * 0x00: default features
72 * 0x02: use diag discipline (diag)
73 * 0x04: set the device initially online (internal use only)
74 * 0x08: enable ERP related logging
75 * 0x10: allow I/O to fail on lost paths
76 * 0x20: allow I/O to fail when a lock was stolen
77 * 0x40: give access to raw eckd data
78 * 0x80: enable discard support
80 #define DASD_FEATURE_DEFAULT 0x00
81 #define DASD_FEATURE_READONLY 0x01
82 #define DASD_FEATURE_USEDIAG 0x02
83 #define DASD_FEATURE_INITIAL_ONLINE 0x04
84 #define DASD_FEATURE_ERPLOG 0x08
85 #define DASD_FEATURE_FAILFAST 0x10
86 #define DASD_FEATURE_FAILONSLCK 0x20
87 #define DASD_FEATURE_USERAW 0x40
88 #define DASD_FEATURE_DISCARD 0x80
90 #define DASD_PARTN_BITS 2
93 * struct dasd_information_t
94 * represents any data about the data, which is visible to userspace
96 typedef struct dasd_information_t {
97 unsigned int devno; /* S/390 devno */
98 unsigned int real_devno; /* for aliases */
99 unsigned int schid; /* S/390 subchannel identifier */
100 unsigned int cu_type : 16; /* from SenseID */
101 unsigned int cu_model : 8; /* from SenseID */
102 unsigned int dev_type : 16; /* from SenseID */
103 unsigned int dev_model : 8; /* from SenseID */
104 unsigned int open_count;
105 unsigned int req_queue_len;
106 unsigned int chanq_len; /* length of chanq */
107 char type[4]; /* from discipline.name, 'none' for unknown */
108 unsigned int status; /* current device level */
109 unsigned int label_block; /* where to find the VOLSER */
110 unsigned int FBA_layout; /* fixed block size (like AIXVOL) */
111 unsigned int characteristics_size;
112 unsigned int confdata_size;
113 char characteristics[64]; /* from read_device_characteristics */
114 char configuration_data[256]; /* from read_configuration_data */
115 } dasd_information_t;
118 * Read Subsystem Data - Performance Statistics
120 typedef struct dasd_rssd_perf_stats_t {
121 unsigned char invalid:1;
122 unsigned char format:3;
123 unsigned char data_format:4;
124 unsigned char unit_address;
125 unsigned short device_status;
126 unsigned int nr_read_normal;
127 unsigned int nr_read_normal_hits;
128 unsigned int nr_write_normal;
129 unsigned int nr_write_fast_normal_hits;
130 unsigned int nr_read_seq;
131 unsigned int nr_read_seq_hits;
132 unsigned int nr_write_seq;
133 unsigned int nr_write_fast_seq_hits;
134 unsigned int nr_read_cache;
135 unsigned int nr_read_cache_hits;
136 unsigned int nr_write_cache;
137 unsigned int nr_write_fast_cache_hits;
138 unsigned int nr_inhibit_cache;
139 unsigned int nr_bybass_cache;
140 unsigned int nr_seq_dasd_to_cache;
141 unsigned int nr_dasd_to_cache;
142 unsigned int nr_cache_to_dasd;
143 unsigned int nr_delayed_fast_write;
144 unsigned int nr_normal_fast_write;
145 unsigned int nr_seq_fast_write;
146 unsigned int nr_cache_miss;
147 unsigned char status2;
148 unsigned int nr_quick_write_promotes;
149 unsigned char reserved;
151 unsigned char reseved2[96];
152 } __attribute__((packed)) dasd_rssd_perf_stats_t;
155 * struct profile_info_t
156 * holds the profinling information
158 typedef struct dasd_profile_info_t {
159 unsigned int dasd_io_reqs; /* number of requests processed at all */
160 unsigned int dasd_io_sects; /* number of sectors processed at all */
161 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
162 unsigned int dasd_io_times[32]; /* histogram of requests's times */
163 unsigned int dasd_io_timps[32]; /* histogram of requests's times per sector */
164 unsigned int dasd_io_time1[32]; /* histogram of time from build to start */
165 unsigned int dasd_io_time2[32]; /* histogram of time from start to irq */
166 unsigned int dasd_io_time2ps[32]; /* histogram of time from start to irq */
167 unsigned int dasd_io_time3[32]; /* histogram of time from irq to end */
168 unsigned int dasd_io_nr_req[32]; /* histogram of # of requests in chanq */
169 } dasd_profile_info_t;
172 * struct format_data_t
173 * represents all data necessary to format a dasd
175 typedef struct format_data_t {
176 unsigned int start_unit; /* from track */
177 unsigned int stop_unit; /* to track */
178 unsigned int blksize; /* sectorsize */
179 unsigned int intensity;
183 * values to be used for format_data_t.intensity
185 * 1/9: also write record zero
186 * 3/11: also write home address
187 * 4/12: invalidate track
189 #define DASD_FMT_INT_FMT_R0 1 /* write record zero */
190 #define DASD_FMT_INT_FMT_HA 2 /* write home address, also set FMT_R0 ! */
191 #define DASD_FMT_INT_INVAL 4 /* invalidate tracks */
192 #define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */
195 * struct format_check_t
196 * represents all data necessary to evaluate the format of
197 * different tracks of a dasd
199 typedef struct format_check_t {
201 struct format_data_t expect;
204 unsigned int result; /* Error indication (DASD_FMT_ERR_*) */
205 unsigned int unit; /* Track that is in error */
206 unsigned int rec; /* Record that is in error */
207 unsigned int num_records; /* Records in the track in error */
208 unsigned int blksize; /* Blocksize of first record in error */
209 unsigned int key_length; /* Key length of first record in error */
212 /* Values returned in format_check_t when a format error is detected: */
213 /* Too few records were found on a single track */
214 #define DASD_FMT_ERR_TOO_FEW_RECORDS 1
215 /* Too many records were found on a single track */
216 #define DASD_FMT_ERR_TOO_MANY_RECORDS 2
217 /* Blocksize/data-length of a record was wrong */
218 #define DASD_FMT_ERR_BLKSIZE 3
219 /* A record ID is defined by cylinder, head, and record number (CHR). */
220 /* On mismatch, this error is set */
221 #define DASD_FMT_ERR_RECORD_ID 4
222 /* If key-length was != 0 */
223 #define DASD_FMT_ERR_KEY_LENGTH 5
226 * struct attrib_data_t
227 * represents the operation (cache) bits for the device.
228 * Used in DE to influence caching of the DASD.
230 typedef struct attrib_data_t {
231 unsigned char operation:3; /* cache operation mode */
232 unsigned char reserved:5; /* cache operation mode */
233 __u16 nr_cyl; /* no of cyliners for read ahaed */
234 __u8 reserved2[29]; /* for future use */
235 } __attribute__ ((packed)) attrib_data_t;
237 /* definition of operation (cache) bits within attributes of DE */
238 #define DASD_NORMAL_CACHE 0x0
239 #define DASD_BYPASS_CACHE 0x1
240 #define DASD_INHIBIT_LOAD 0x2
241 #define DASD_SEQ_ACCESS 0x3
242 #define DASD_SEQ_PRESTAGE 0x4
243 #define DASD_REC_ACCESS 0x5
246 * Perform EMC Symmetrix I/O
248 typedef struct dasd_symmio_parms {
249 unsigned char reserved[8]; /* compat with older releases */
250 unsigned long long psf_data; /* char * cast to u64 */
251 unsigned long long rssd_result; /* char * cast to u64 */
254 } __attribute__ ((packed)) dasd_symmio_parms_t;
257 * Data returned by Sense Path Group ID (SNID)
259 struct dasd_snid_data {
265 } __attribute__ ((packed)) path_state;
267 } __attribute__ ((packed));
269 struct dasd_snid_ioctl_data {
270 struct dasd_snid_data data;
272 } __attribute__ ((packed));
275 /********************************************************************************
276 * SECTION: Definition of IOCTLs
278 * Here ist how the ioctl-nr should be used:
279 * 0 - 31 DASD driver itself
280 * 32 - 239 still open
281 * 240 - 255 reserved for EMC
282 *******************************************************************************/
284 /* Disable the volume (for Linux) */
285 #define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0)
286 /* Enable the volume (for Linux) */
287 #define BIODASDENABLE _IO(DASD_IOCTL_LETTER,1)
288 /* Issue a reserve/release command, rsp. */
289 #define BIODASDRSRV _IO(DASD_IOCTL_LETTER,2) /* reserve */
290 #define BIODASDRLSE _IO(DASD_IOCTL_LETTER,3) /* release */
291 #define BIODASDSLCK _IO(DASD_IOCTL_LETTER,4) /* steal lock */
292 /* reset profiling information of a device */
293 #define BIODASDPRRST _IO(DASD_IOCTL_LETTER,5)
294 /* Quiesce IO on device */
295 #define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6)
296 /* Resume IO on device */
297 #define BIODASDRESUME _IO(DASD_IOCTL_LETTER,7)
298 /* Abort all I/O on a device */
299 #define BIODASDABORTIO _IO(DASD_IOCTL_LETTER, 240)
300 /* Allow I/O on a device */
301 #define BIODASDALLOWIO _IO(DASD_IOCTL_LETTER, 241)
304 /* retrieve API version number */
305 #define DASDAPIVER _IOR(DASD_IOCTL_LETTER,0,int)
306 /* Get information on a dasd device */
307 #define BIODASDINFO _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
308 /* retrieve profiling information of a device */
309 #define BIODASDPRRD _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t)
310 /* Get information on a dasd device (enhanced) */
311 #define BIODASDINFO2 _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t)
312 /* Performance Statistics Read */
313 #define BIODASDPSRD _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t)
314 /* Get Attributes (cache operations) */
315 #define BIODASDGATTR _IOR(DASD_IOCTL_LETTER,5,attrib_data_t)
318 /* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
319 #define BIODASDFMT _IOW(DASD_IOCTL_LETTER,1,format_data_t)
320 /* Set Attributes (cache operations) */
321 #define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)
323 /* Get Sense Path Group ID (SNID) data */
324 #define BIODASDSNID _IOWR(DASD_IOCTL_LETTER, 1, struct dasd_snid_ioctl_data)
325 /* Check device format according to format_check_t */
326 #define BIODASDCHECKFMT _IOWR(DASD_IOCTL_LETTER, 2, format_check_t)
328 #define BIODASDSYMMIO _IOWR(DASD_IOCTL_LETTER, 240, dasd_symmio_parms_t)