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
7 * This file is the interface of the DASD device driver, which is exported to user space
8 * any future changes wrt the API will result in a change of the APIVERSION reported
9 * to userspace by the DASDAPIVER-ioctl
13 * History of changes (starts July 2000)
14 * 05/04/01 created by moving the kernel interface to drivers/s390/block/dasd_int.h
15 * 12/06/01 DASD_API_VERSION 2 - binary compatible to 0 (new BIODASDINFO2)
16 * 01/23/02 DASD_API_VERSION 3 - added BIODASDPSRD IOCTL
17 * 02/15/02 DASD_API_VERSION 4 - added BIODASDSATTR IOCTL
18 * 06/07/02 DASD_API_VERSION 5 - added 'boxed DASD' support
24 #include <linux/ioctl.h>
26 #define DASD_IOCTL_LETTER 'D'
28 #define DASD_API_VERSION 5
31 * struct dasd_information2_t
32 * represents any data about the device, which is visible to userspace.
33 * including foramt and featueres.
35 typedef struct dasd_information2_t {
36 unsigned int devno; /* S/390 devno */
37 unsigned int real_devno; /* for aliases */
38 unsigned int schid; /* S/390 subchannel identifier */
39 unsigned int cu_type : 16; /* from SenseID */
40 unsigned int cu_model : 8; /* from SenseID */
41 unsigned int dev_type : 16; /* from SenseID */
42 unsigned int dev_model : 8; /* from SenseID */
43 unsigned int open_count;
44 unsigned int req_queue_len;
45 unsigned int chanq_len; /* length of chanq */
46 char type[4]; /* from discipline.name, 'none' for unknown */
47 unsigned int status; /* current device level */
48 unsigned int label_block; /* where to find the VOLSER */
49 unsigned int FBA_layout; /* fixed block size (like AIXVOL) */
50 unsigned int characteristics_size;
51 unsigned int confdata_size;
52 char characteristics[64]; /* from read_device_characteristics */
53 char configuration_data[256]; /* from read_configuration_data */
54 unsigned int format; /* format info like formatted/cdl/ldl/... */
55 unsigned int features; /* dasd features like 'ro',... */
56 unsigned int reserved0; /* reserved for further use ,... */
57 unsigned int reserved1; /* reserved for further use ,... */
58 unsigned int reserved2; /* reserved for further use ,... */
59 unsigned int reserved3; /* reserved for further use ,... */
60 unsigned int reserved4; /* reserved for further use ,... */
61 unsigned int reserved5; /* reserved for further use ,... */
62 unsigned int reserved6; /* reserved for further use ,... */
63 unsigned int reserved7; /* reserved for further use ,... */
64 } dasd_information2_t;
67 * values to be used for dasd_information_t.format
69 * 0x01: Linux disc layout
70 * 0x02: Common disc layout
72 #define DASD_FORMAT_NONE 0
73 #define DASD_FORMAT_LDL 1
74 #define DASD_FORMAT_CDL 2
76 * values to be used for dasd_information_t.features
77 * 0x00: default features
80 #define DASD_FEATURE_DEFAULT 0
81 #define DASD_FEATURE_READONLY 1
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 - Perfomance 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 unsigned short nr_cyl; /* no of cyliners for read ahaed */
197 unsigned char 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 /********************************************************************************
210 * SECTION: Definition of IOCTLs
212 * Here ist how the ioctl-nr should be used:
213 * 0 - 31 DASD driver itself
214 * 32 - 239 still open
215 * 240 - 255 reserved for EMC
216 *******************************************************************************/
218 /* Disable the volume (for Linux) */
219 #define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0)
220 /* Enable the volume (for Linux) */
221 #define BIODASDENABLE _IO(DASD_IOCTL_LETTER,1)
222 /* Issue a reserve/release command, rsp. */
223 #define BIODASDRSRV _IO(DASD_IOCTL_LETTER,2) /* reserve */
224 #define BIODASDRLSE _IO(DASD_IOCTL_LETTER,3) /* release */
225 #define BIODASDSLCK _IO(DASD_IOCTL_LETTER,4) /* steal lock */
226 /* reset profiling information of a device */
227 #define BIODASDPRRST _IO(DASD_IOCTL_LETTER,5)
228 /* Quiesce IO on device */
229 #define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6)
230 /* Resume IO on device */
231 #define BIODASDRESUME _IO(DASD_IOCTL_LETTER,7)
234 /* retrieve API version number */
235 #define DASDAPIVER _IOR(DASD_IOCTL_LETTER,0,int)
236 /* Get information on a dasd device */
237 #define BIODASDINFO _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
238 /* retrieve profiling information of a device */
239 #define BIODASDPRRD _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t)
240 /* Get information on a dasd device (enhanced) */
241 #define BIODASDINFO2 _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t)
242 /* Performance Statistics Read */
243 #define BIODASDPSRD _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t)
244 /* Get Attributes (cache operations) */
245 #define BIODASDGATTR _IOR(DASD_IOCTL_LETTER,5,attrib_data_t)
248 /* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
249 #define BIODASDFMT _IOW(DASD_IOCTL_LETTER,1,format_data_t)
250 /* Set Attributes (cache operations) */
251 #define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)
257 * Overrides for Emacs so that we follow Linus's tabbing style.
258 * Emacs will notice this stuff at the end of the file and automatically
259 * adjust the settings for this buffer only. This must remain at the end
261 * ---------------------------------------------------------------------------
264 * c-brace-imaginary-offset: 0
266 * c-argdecl-indent: 4
268 * c-continued-statement-offset: 4
269 * c-continued-brace-offset: 0
270 * indent-tabs-mode: nil