2 * File...........: linux/drivers/s390/block/dasd.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Bugreports.to..: <Linux390@de.ibm.com>
5 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
6 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
7 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
9 * This file is the interface of the DASD device driver, which is exported to user space
10 * any future changes wrt the API will result in a change of the APIVERSION reported
11 * to userspace by the DASDAPIVER-ioctl
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
76 #define DASD_FEATURE_DEFAULT 0x00
77 #define DASD_FEATURE_READONLY 0x01
78 #define DASD_FEATURE_USEDIAG 0x02
79 #define DASD_FEATURE_INITIAL_ONLINE 0x04
80 #define DASD_FEATURE_ERPLOG 0x08
81 #define DASD_FEATURE_FAILFAST 0x10
83 #define DASD_PARTN_BITS 2
86 * struct dasd_information_t
87 * represents any data about the data, which is visible to userspace
89 typedef struct dasd_information_t {
90 unsigned int devno; /* S/390 devno */
91 unsigned int real_devno; /* for aliases */
92 unsigned int schid; /* S/390 subchannel identifier */
93 unsigned int cu_type : 16; /* from SenseID */
94 unsigned int cu_model : 8; /* from SenseID */
95 unsigned int dev_type : 16; /* from SenseID */
96 unsigned int dev_model : 8; /* from SenseID */
97 unsigned int open_count;
98 unsigned int req_queue_len;
99 unsigned int chanq_len; /* length of chanq */
100 char type[4]; /* from discipline.name, 'none' for unknown */
101 unsigned int status; /* current device level */
102 unsigned int label_block; /* where to find the VOLSER */
103 unsigned int FBA_layout; /* fixed block size (like AIXVOL) */
104 unsigned int characteristics_size;
105 unsigned int confdata_size;
106 char characteristics[64]; /* from read_device_characteristics */
107 char configuration_data[256]; /* from read_configuration_data */
108 } dasd_information_t;
111 * Read Subsystem Data - Performance Statistics
113 typedef struct dasd_rssd_perf_stats_t {
114 unsigned char invalid:1;
115 unsigned char format:3;
116 unsigned char data_format:4;
117 unsigned char unit_address;
118 unsigned short device_status;
119 unsigned int nr_read_normal;
120 unsigned int nr_read_normal_hits;
121 unsigned int nr_write_normal;
122 unsigned int nr_write_fast_normal_hits;
123 unsigned int nr_read_seq;
124 unsigned int nr_read_seq_hits;
125 unsigned int nr_write_seq;
126 unsigned int nr_write_fast_seq_hits;
127 unsigned int nr_read_cache;
128 unsigned int nr_read_cache_hits;
129 unsigned int nr_write_cache;
130 unsigned int nr_write_fast_cache_hits;
131 unsigned int nr_inhibit_cache;
132 unsigned int nr_bybass_cache;
133 unsigned int nr_seq_dasd_to_cache;
134 unsigned int nr_dasd_to_cache;
135 unsigned int nr_cache_to_dasd;
136 unsigned int nr_delayed_fast_write;
137 unsigned int nr_normal_fast_write;
138 unsigned int nr_seq_fast_write;
139 unsigned int nr_cache_miss;
140 unsigned char status2;
141 unsigned int nr_quick_write_promotes;
142 unsigned char reserved;
144 unsigned char reseved2[96];
145 } __attribute__((packed)) dasd_rssd_perf_stats_t;
148 * struct profile_info_t
149 * holds the profinling information
151 typedef struct dasd_profile_info_t {
152 unsigned int dasd_io_reqs; /* number of requests processed at all */
153 unsigned int dasd_io_sects; /* number of sectors processed at all */
154 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
155 unsigned int dasd_io_times[32]; /* histogram of requests's times */
156 unsigned int dasd_io_timps[32]; /* histogram of requests's times per sector */
157 unsigned int dasd_io_time1[32]; /* histogram of time from build to start */
158 unsigned int dasd_io_time2[32]; /* histogram of time from start to irq */
159 unsigned int dasd_io_time2ps[32]; /* histogram of time from start to irq */
160 unsigned int dasd_io_time3[32]; /* histogram of time from irq to end */
161 unsigned int dasd_io_nr_req[32]; /* histogram of # of requests in chanq */
162 } dasd_profile_info_t;
165 * struct format_data_t
166 * represents all data necessary to format a dasd
168 typedef struct format_data_t {
169 int start_unit; /* from track */
170 int stop_unit; /* to track */
171 int blksize; /* sectorsize */
176 * values to be used for format_data_t.intensity
178 * 1/9: also write record zero
179 * 3/11: also write home address
180 * 4/12: invalidate track
182 #define DASD_FMT_INT_FMT_R0 1 /* write record zero */
183 #define DASD_FMT_INT_FMT_HA 2 /* write home address, also set FMT_R0 ! */
184 #define DASD_FMT_INT_INVAL 4 /* invalidate tracks */
185 #define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */
189 * struct attrib_data_t
190 * represents the operation (cache) bits for the device.
191 * Used in DE to influence caching of the DASD.
193 typedef struct attrib_data_t {
194 unsigned char operation:3; /* cache operation mode */
195 unsigned char reserved:5; /* cache operation mode */
196 __u16 nr_cyl; /* no of cyliners for read ahaed */
197 __u8 reserved2[29]; /* for future use */
198 } __attribute__ ((packed)) attrib_data_t;
200 /* definition of operation (cache) bits within attributes of DE */
201 #define DASD_NORMAL_CACHE 0x0
202 #define DASD_BYPASS_CACHE 0x1
203 #define DASD_INHIBIT_LOAD 0x2
204 #define DASD_SEQ_ACCESS 0x3
205 #define DASD_SEQ_PRESTAGE 0x4
206 #define DASD_REC_ACCESS 0x5
209 * Perform EMC Symmetrix I/O
211 typedef struct dasd_symmio_parms {
212 unsigned char reserved[8]; /* compat with older releases */
213 unsigned long long psf_data; /* char * cast to u64 */
214 unsigned long long rssd_result; /* char * cast to u64 */
217 } __attribute__ ((packed)) dasd_symmio_parms_t;
219 /********************************************************************************
220 * SECTION: Definition of IOCTLs
222 * Here ist how the ioctl-nr should be used:
223 * 0 - 31 DASD driver itself
224 * 32 - 239 still open
225 * 240 - 255 reserved for EMC
226 *******************************************************************************/
228 /* Disable the volume (for Linux) */
229 #define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0)
230 /* Enable the volume (for Linux) */
231 #define BIODASDENABLE _IO(DASD_IOCTL_LETTER,1)
232 /* Issue a reserve/release command, rsp. */
233 #define BIODASDRSRV _IO(DASD_IOCTL_LETTER,2) /* reserve */
234 #define BIODASDRLSE _IO(DASD_IOCTL_LETTER,3) /* release */
235 #define BIODASDSLCK _IO(DASD_IOCTL_LETTER,4) /* steal lock */
236 /* reset profiling information of a device */
237 #define BIODASDPRRST _IO(DASD_IOCTL_LETTER,5)
238 /* Quiesce IO on device */
239 #define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6)
240 /* Resume IO on device */
241 #define BIODASDRESUME _IO(DASD_IOCTL_LETTER,7)
244 /* retrieve API version number */
245 #define DASDAPIVER _IOR(DASD_IOCTL_LETTER,0,int)
246 /* Get information on a dasd device */
247 #define BIODASDINFO _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
248 /* retrieve profiling information of a device */
249 #define BIODASDPRRD _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t)
250 /* Get information on a dasd device (enhanced) */
251 #define BIODASDINFO2 _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t)
252 /* Performance Statistics Read */
253 #define BIODASDPSRD _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t)
254 /* Get Attributes (cache operations) */
255 #define BIODASDGATTR _IOR(DASD_IOCTL_LETTER,5,attrib_data_t)
258 /* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
259 #define BIODASDFMT _IOW(DASD_IOCTL_LETTER,1,format_data_t)
260 /* Set Attributes (cache operations) */
261 #define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)
263 #define BIODASDSYMMIO _IOWR(DASD_IOCTL_LETTER, 240, dasd_symmio_parms_t)
268 * Overrides for Emacs so that we follow Linus's tabbing style.
269 * Emacs will notice this stuff at the end of the file and automatically
270 * adjust the settings for this buffer only. This must remain at the end
272 * ---------------------------------------------------------------------------
275 * c-brace-imaginary-offset: 0
277 * c-argdecl-indent: 4
279 * c-continued-statement-offset: 4
280 * c-continued-brace-offset: 0
281 * indent-tabs-mode: nil