aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/include/asm/dasd.h
blob: fb50a7864dd5f64344c2b519cd76cf607e3cae50 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
/* 
 * File...........: linux/drivers/s390/block/dasd.c
 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
 * Bugreports.to..: <Linux390@de.ibm.com>
 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
 *
 * This file is the interface of the DASD device driver, which is exported to user space
 * any future changes wrt the API will result in a change of the APIVERSION reported
 * to userspace by the DASDAPIVER-ioctl
 *
 */

#ifndef DASD_H
#define DASD_H
#include <linux/ioctl.h>

#define DASD_IOCTL_LETTER 'D'

#define DASD_API_VERSION 6

/* 
 * struct dasd_information2_t
 * represents any data about the device, which is visible to userspace.
 *  including foramt and featueres.
 */
typedef struct dasd_information2_t {
        unsigned int devno;         /* S/390 devno */
        unsigned int real_devno;    /* for aliases */
        unsigned int schid;         /* S/390 subchannel identifier */
        unsigned int cu_type  : 16; /* from SenseID */
        unsigned int cu_model :  8; /* from SenseID */
        unsigned int dev_type : 16; /* from SenseID */
        unsigned int dev_model : 8; /* from SenseID */
        unsigned int open_count; 
        unsigned int req_queue_len; 
        unsigned int chanq_len;     /* length of chanq */
        char type[4];               /* from discipline.name, 'none' for unknown */
        unsigned int status;        /* current device level */
        unsigned int label_block;   /* where to find the VOLSER */
        unsigned int FBA_layout;    /* fixed block size (like AIXVOL) */
        unsigned int characteristics_size;
        unsigned int confdata_size;
        char characteristics[64];   /* from read_device_characteristics */
        char configuration_data[256]; /* from read_configuration_data */
        unsigned int format;          /* format info like formatted/cdl/ldl/... */
        unsigned int features;        /* dasd features like 'ro',...            */
        unsigned int reserved0;       /* reserved for further use ,...          */
        unsigned int reserved1;       /* reserved for further use ,...          */
        unsigned int reserved2;       /* reserved for further use ,...          */
        unsigned int reserved3;       /* reserved for further use ,...          */
        unsigned int reserved4;       /* reserved for further use ,...          */
        unsigned int reserved5;       /* reserved for further use ,...          */
        unsigned int reserved6;       /* reserved for further use ,...          */
        unsigned int reserved7;       /* reserved for further use ,...          */
} dasd_information2_t;

/*
 * values to be used for dasd_information_t.format
 * 0x00: NOT formatted
 * 0x01: Linux disc layout
 * 0x02: Common disc layout
 */
#define DASD_FORMAT_NONE 0
#define DASD_FORMAT_LDL  1
#define DASD_FORMAT_CDL  2
/*
 * values to be used for dasd_information_t.features
 * 0x00: default features
 * 0x01: readonly (ro)
 * 0x02: use diag discipline (diag)
 * 0x04: set the device initially online (internal use only)
 * 0x08: enable ERP related logging
 */
#define DASD_FEATURE_DEFAULT	     0x00
#define DASD_FEATURE_READONLY	     0x01
#define DASD_FEATURE_USEDIAG	     0x02
#define DASD_FEATURE_INITIAL_ONLINE  0x04
#define DASD_FEATURE_ERPLOG	     0x08
#define DASD_FEATURE_FAILFAST	     0x10

#define DASD_PARTN_BITS 2

/* 
 * struct dasd_information_t
 * represents any data about the data, which is visible to userspace
 */
typedef struct dasd_information_t {
        unsigned int devno;         /* S/390 devno */
        unsigned int real_devno;    /* for aliases */
        unsigned int schid;         /* S/390 subchannel identifier */
        unsigned int cu_type  : 16; /* from SenseID */
        unsigned int cu_model :  8; /* from SenseID */
        unsigned int dev_type : 16; /* from SenseID */
        unsigned int dev_model : 8; /* from SenseID */
        unsigned int open_count; 
        unsigned int req_queue_len; 
        unsigned int chanq_len;     /* length of chanq */
        char type[4];               /* from discipline.name, 'none' for unknown */
        unsigned int status;        /* current device level */
        unsigned int label_block;   /* where to find the VOLSER */
        unsigned int FBA_layout;    /* fixed block size (like AIXVOL) */
        unsigned int characteristics_size;
        unsigned int confdata_size;
        char characteristics[64];   /* from read_device_characteristics */
        char configuration_data[256]; /* from read_configuration_data */
} dasd_information_t;

/*
 * Read Subsystem Data - Performance Statistics
 */ 
typedef struct dasd_rssd_perf_stats_t {
	unsigned char  invalid:1;
	unsigned char  format:3;
	unsigned char  data_format:4;
	unsigned char  unit_address;
	unsigned short device_status;
	unsigned int   nr_read_normal;
	unsigned int   nr_read_normal_hits;
	unsigned int   nr_write_normal;
	unsigned int   nr_write_fast_normal_hits;
	unsigned int   nr_read_seq;
	unsigned int   nr_read_seq_hits;
	unsigned int   nr_write_seq;
	unsigned int   nr_write_fast_seq_hits;
	unsigned int   nr_read_cache;
	unsigned int   nr_read_cache_hits;
	unsigned int   nr_write_cache;
	unsigned int   nr_write_fast_cache_hits;
	unsigned int   nr_inhibit_cache;
	unsigned int   nr_bybass_cache;
	unsigned int   nr_seq_dasd_to_cache;
	unsigned int   nr_dasd_to_cache;
	unsigned int   nr_cache_to_dasd;
	unsigned int   nr_delayed_fast_write;
	unsigned int   nr_normal_fast_write;
	unsigned int   nr_seq_fast_write;
	unsigned int   nr_cache_miss;
	unsigned char  status2;
	unsigned int   nr_quick_write_promotes;
	unsigned char  reserved;
	unsigned short ssid;
	unsigned char  reseved2[96];
} __attribute__((packed)) dasd_rssd_perf_stats_t;

/* 
 * struct profile_info_t
 * holds the profinling information 
 */
typedef struct dasd_profile_info_t {
        unsigned int dasd_io_reqs;	 /* number of requests processed at all */
        unsigned int dasd_io_sects;	 /* number of sectors processed at all */
        unsigned int dasd_io_secs[32];	 /* histogram of request's sizes */
        unsigned int dasd_io_times[32];	 /* histogram of requests's times */
        unsigned int dasd_io_timps[32];	 /* histogram of requests's times per sector */
        unsigned int dasd_io_time1[32];	 /* histogram of time from build to start */
        unsigned int dasd_io_time2[32];	 /* histogram of time from start to irq */
        unsigned int dasd_io_time2ps[32]; /* histogram of time from start to irq */
        unsigned int dasd_io_time3[32];	 /* histogram of time from irq to end */
        unsigned int dasd_io_nr_req[32]; /* histogram of # of requests in chanq */
} dasd_profile_info_t;

/* 
 * struct format_data_t
 * represents all data necessary to format a dasd
 */
typedef struct format_data_t {
	int start_unit; /* from track */
	int stop_unit;  /* to track */
	int blksize;    /* sectorsize */
        int intensity;  
} format_data_t;

/*
 * values to be used for format_data_t.intensity
 * 0/8: normal format
 * 1/9: also write record zero
 * 3/11: also write home address
 * 4/12: invalidate track
 */
#define DASD_FMT_INT_FMT_R0 1 /* write record zero */
#define DASD_FMT_INT_FMT_HA 2 /* write home address, also set FMT_R0 ! */
#define DASD_FMT_INT_INVAL  4 /* invalidate tracks */
#define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */


/* 
 * struct attrib_data_t
 * represents the operation (cache) bits for the device.
 * Used in DE to influence caching of the DASD.
 */
typedef struct attrib_data_t {
	unsigned char operation:3;     /* cache operation mode */
	unsigned char reserved:5;      /* cache operation mode */
	__u16         nr_cyl;          /* no of cyliners for read ahaed */
	__u8          reserved2[29];   /* for future use */
} __attribute__ ((packed)) attrib_data_t;

/* definition of operation (cache) bits within attributes of DE */
#define DASD_NORMAL_CACHE  0x0
#define DASD_BYPASS_CACHE  0x1
#define DASD_INHIBIT_LOAD  0x2
#define DASD_SEQ_ACCESS    0x3
#define DASD_SEQ_PRESTAGE  0x4
#define DASD_REC_ACCESS    0x5

/*
 * Perform EMC Symmetrix I/O
 */
typedef struct dasd_symmio_parms {
	unsigned char reserved[8];	/* compat with older releases */
	unsigned long long psf_data;	/* char * cast to u64 */
	unsigned long long rssd_result; /* char * cast to u64 */
	int psf_data_len;
	int rssd_result_len;
} __attribute__ ((packed)) dasd_symmio_parms_t;

/********************************************************************************
 * SECTION: Definition of IOCTLs
 *
 * Here ist how the ioctl-nr should be used:
 *    0 -   31   DASD driver itself
 *   32 -  239   still open
 *  240 -  255   reserved for EMC 
 *******************************************************************************/

/* Disable the volume (for Linux) */
#define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0) 
/* Enable the volume (for Linux) */
#define BIODASDENABLE  _IO(DASD_IOCTL_LETTER,1)  
/* Issue a reserve/release command, rsp. */
#define BIODASDRSRV    _IO(DASD_IOCTL_LETTER,2) /* reserve */
#define BIODASDRLSE    _IO(DASD_IOCTL_LETTER,3) /* release */
#define BIODASDSLCK    _IO(DASD_IOCTL_LETTER,4) /* steal lock */
/* reset profiling information of a device */
#define BIODASDPRRST   _IO(DASD_IOCTL_LETTER,5)
/* Quiesce IO on device */
#define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6) 
/* Resume IO on device */
#define BIODASDRESUME  _IO(DASD_IOCTL_LETTER,7) 


/* retrieve API version number */
#define DASDAPIVER     _IOR(DASD_IOCTL_LETTER,0,int)
/* Get information on a dasd device */
#define BIODASDINFO    _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
/* retrieve profiling information of a device */
#define BIODASDPRRD    _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t)
/* Get information on a dasd device (enhanced) */
#define BIODASDINFO2   _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t)
/* Performance Statistics Read */
#define BIODASDPSRD    _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t)
/* Get Attributes (cache operations) */
#define BIODASDGATTR   _IOR(DASD_IOCTL_LETTER,5,attrib_data_t) 


/* #define BIODASDFORMAT  _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
#define BIODASDFMT     _IOW(DASD_IOCTL_LETTER,1,format_data_t) 
/* Set Attributes (cache operations) */
#define BIODASDSATTR   _IOW(DASD_IOCTL_LETTER,2,attrib_data_t) 

#define BIODASDSYMMIO  _IOWR(DASD_IOCTL_LETTER, 240, dasd_symmio_parms_t)

#endif				/* DASD_H */

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-indent-level: 4 
 * c-brace-imaginary-offset: 0
 * c-brace-offset: -4
 * c-argdecl-indent: 4
 * c-label-offset: -4
 * c-continued-statement-offset: 4
 * c-continued-brace-offset: 0
 * indent-tabs-mode: nil
 * tab-width: 8
 * End:
 */