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1 | /* |
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 | * | |
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 | |
10 | * | |
11 | * $Revision: 1.6 $ | |
12 | * | |
13 | */ | |
14 | ||
15 | #ifndef DASD_H | |
16 | #define DASD_H | |
17 | #include <linux/ioctl.h> | |
18 | ||
19 | #define DASD_IOCTL_LETTER 'D' | |
20 | ||
21 | #define DASD_API_VERSION 6 | |
22 | ||
23 | /* | |
24 | * struct dasd_information2_t | |
25 | * represents any data about the device, which is visible to userspace. | |
26 | * including foramt and featueres. | |
27 | */ | |
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; | |
58 | ||
59 | /* | |
60 | * values to be used for dasd_information_t.format | |
61 | * 0x00: NOT formatted | |
62 | * 0x01: Linux disc layout | |
63 | * 0x02: Common disc layout | |
64 | */ | |
65 | #define DASD_FORMAT_NONE 0 | |
66 | #define DASD_FORMAT_LDL 1 | |
67 | #define DASD_FORMAT_CDL 2 | |
68 | /* | |
69 | * values to be used for dasd_information_t.features | |
70 | * 0x00: default features | |
71 | * 0x01: readonly (ro) | |
72 | * 0x02: use diag discipline (diag) | |
73 | */ | |
74 | #define DASD_FEATURE_DEFAULT 0 | |
75 | #define DASD_FEATURE_READONLY 1 | |
76 | #define DASD_FEATURE_USEDIAG 2 | |
77 | ||
78 | #define DASD_PARTN_BITS 2 | |
79 | ||
80 | /* | |
81 | * struct dasd_information_t | |
82 | * represents any data about the data, which is visible to userspace | |
83 | */ | |
84 | typedef struct dasd_information_t { | |
85 | unsigned int devno; /* S/390 devno */ | |
86 | unsigned int real_devno; /* for aliases */ | |
87 | unsigned int schid; /* S/390 subchannel identifier */ | |
88 | unsigned int cu_type : 16; /* from SenseID */ | |
89 | unsigned int cu_model : 8; /* from SenseID */ | |
90 | unsigned int dev_type : 16; /* from SenseID */ | |
91 | unsigned int dev_model : 8; /* from SenseID */ | |
92 | unsigned int open_count; | |
93 | unsigned int req_queue_len; | |
94 | unsigned int chanq_len; /* length of chanq */ | |
95 | char type[4]; /* from discipline.name, 'none' for unknown */ | |
96 | unsigned int status; /* current device level */ | |
97 | unsigned int label_block; /* where to find the VOLSER */ | |
98 | unsigned int FBA_layout; /* fixed block size (like AIXVOL) */ | |
99 | unsigned int characteristics_size; | |
100 | unsigned int confdata_size; | |
101 | char characteristics[64]; /* from read_device_characteristics */ | |
102 | char configuration_data[256]; /* from read_configuration_data */ | |
103 | } dasd_information_t; | |
104 | ||
105 | /* | |
106 | * Read Subsystem Data - Perfomance Statistics | |
107 | */ | |
108 | typedef struct dasd_rssd_perf_stats_t { | |
109 | unsigned char invalid:1; | |
110 | unsigned char format:3; | |
111 | unsigned char data_format:4; | |
112 | unsigned char unit_address; | |
113 | unsigned short device_status; | |
114 | unsigned int nr_read_normal; | |
115 | unsigned int nr_read_normal_hits; | |
116 | unsigned int nr_write_normal; | |
117 | unsigned int nr_write_fast_normal_hits; | |
118 | unsigned int nr_read_seq; | |
119 | unsigned int nr_read_seq_hits; | |
120 | unsigned int nr_write_seq; | |
121 | unsigned int nr_write_fast_seq_hits; | |
122 | unsigned int nr_read_cache; | |
123 | unsigned int nr_read_cache_hits; | |
124 | unsigned int nr_write_cache; | |
125 | unsigned int nr_write_fast_cache_hits; | |
126 | unsigned int nr_inhibit_cache; | |
127 | unsigned int nr_bybass_cache; | |
128 | unsigned int nr_seq_dasd_to_cache; | |
129 | unsigned int nr_dasd_to_cache; | |
130 | unsigned int nr_cache_to_dasd; | |
131 | unsigned int nr_delayed_fast_write; | |
132 | unsigned int nr_normal_fast_write; | |
133 | unsigned int nr_seq_fast_write; | |
134 | unsigned int nr_cache_miss; | |
135 | unsigned char status2; | |
136 | unsigned int nr_quick_write_promotes; | |
137 | unsigned char reserved; | |
138 | unsigned short ssid; | |
139 | unsigned char reseved2[96]; | |
140 | } __attribute__((packed)) dasd_rssd_perf_stats_t; | |
141 | ||
142 | /* | |
143 | * struct profile_info_t | |
144 | * holds the profinling information | |
145 | */ | |
146 | typedef struct dasd_profile_info_t { | |
147 | unsigned int dasd_io_reqs; /* number of requests processed at all */ | |
148 | unsigned int dasd_io_sects; /* number of sectors processed at all */ | |
149 | unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ | |
150 | unsigned int dasd_io_times[32]; /* histogram of requests's times */ | |
151 | unsigned int dasd_io_timps[32]; /* histogram of requests's times per sector */ | |
152 | unsigned int dasd_io_time1[32]; /* histogram of time from build to start */ | |
153 | unsigned int dasd_io_time2[32]; /* histogram of time from start to irq */ | |
154 | unsigned int dasd_io_time2ps[32]; /* histogram of time from start to irq */ | |
155 | unsigned int dasd_io_time3[32]; /* histogram of time from irq to end */ | |
156 | unsigned int dasd_io_nr_req[32]; /* histogram of # of requests in chanq */ | |
157 | } dasd_profile_info_t; | |
158 | ||
159 | /* | |
160 | * struct format_data_t | |
161 | * represents all data necessary to format a dasd | |
162 | */ | |
163 | typedef struct format_data_t { | |
164 | int start_unit; /* from track */ | |
165 | int stop_unit; /* to track */ | |
166 | int blksize; /* sectorsize */ | |
167 | int intensity; | |
168 | } format_data_t; | |
169 | ||
170 | /* | |
171 | * values to be used for format_data_t.intensity | |
172 | * 0/8: normal format | |
173 | * 1/9: also write record zero | |
174 | * 3/11: also write home address | |
175 | * 4/12: invalidate track | |
176 | */ | |
177 | #define DASD_FMT_INT_FMT_R0 1 /* write record zero */ | |
178 | #define DASD_FMT_INT_FMT_HA 2 /* write home address, also set FMT_R0 ! */ | |
179 | #define DASD_FMT_INT_INVAL 4 /* invalidate tracks */ | |
180 | #define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */ | |
181 | ||
182 | ||
183 | /* | |
184 | * struct attrib_data_t | |
185 | * represents the operation (cache) bits for the device. | |
186 | * Used in DE to influence caching of the DASD. | |
187 | */ | |
188 | typedef struct attrib_data_t { | |
189 | unsigned char operation:3; /* cache operation mode */ | |
190 | unsigned char reserved:5; /* cache operation mode */ | |
191 | __u16 nr_cyl; /* no of cyliners for read ahaed */ | |
192 | __u8 reserved2[29]; /* for future use */ | |
193 | } __attribute__ ((packed)) attrib_data_t; | |
194 | ||
195 | /* definition of operation (cache) bits within attributes of DE */ | |
196 | #define DASD_NORMAL_CACHE 0x0 | |
197 | #define DASD_BYPASS_CACHE 0x1 | |
198 | #define DASD_INHIBIT_LOAD 0x2 | |
199 | #define DASD_SEQ_ACCESS 0x3 | |
200 | #define DASD_SEQ_PRESTAGE 0x4 | |
201 | #define DASD_REC_ACCESS 0x5 | |
202 | ||
203 | ||
204 | /******************************************************************************** | |
205 | * SECTION: Definition of IOCTLs | |
206 | * | |
207 | * Here ist how the ioctl-nr should be used: | |
208 | * 0 - 31 DASD driver itself | |
209 | * 32 - 239 still open | |
210 | * 240 - 255 reserved for EMC | |
211 | *******************************************************************************/ | |
212 | ||
213 | /* Disable the volume (for Linux) */ | |
214 | #define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0) | |
215 | /* Enable the volume (for Linux) */ | |
216 | #define BIODASDENABLE _IO(DASD_IOCTL_LETTER,1) | |
217 | /* Issue a reserve/release command, rsp. */ | |
218 | #define BIODASDRSRV _IO(DASD_IOCTL_LETTER,2) /* reserve */ | |
219 | #define BIODASDRLSE _IO(DASD_IOCTL_LETTER,3) /* release */ | |
220 | #define BIODASDSLCK _IO(DASD_IOCTL_LETTER,4) /* steal lock */ | |
221 | /* reset profiling information of a device */ | |
222 | #define BIODASDPRRST _IO(DASD_IOCTL_LETTER,5) | |
223 | /* Quiesce IO on device */ | |
224 | #define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6) | |
225 | /* Resume IO on device */ | |
226 | #define BIODASDRESUME _IO(DASD_IOCTL_LETTER,7) | |
227 | ||
228 | ||
229 | /* retrieve API version number */ | |
230 | #define DASDAPIVER _IOR(DASD_IOCTL_LETTER,0,int) | |
231 | /* Get information on a dasd device */ | |
232 | #define BIODASDINFO _IOR(DASD_IOCTL_LETTER,1,dasd_information_t) | |
233 | /* retrieve profiling information of a device */ | |
234 | #define BIODASDPRRD _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t) | |
235 | /* Get information on a dasd device (enhanced) */ | |
236 | #define BIODASDINFO2 _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t) | |
237 | /* Performance Statistics Read */ | |
238 | #define BIODASDPSRD _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t) | |
239 | /* Get Attributes (cache operations) */ | |
240 | #define BIODASDGATTR _IOR(DASD_IOCTL_LETTER,5,attrib_data_t) | |
241 | ||
242 | ||
243 | /* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */ | |
244 | #define BIODASDFMT _IOW(DASD_IOCTL_LETTER,1,format_data_t) | |
245 | /* Set Attributes (cache operations) */ | |
246 | #define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t) | |
247 | ||
248 | ||
249 | #endif /* DASD_H */ | |
250 | ||
251 | /* | |
252 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
253 | * Emacs will notice this stuff at the end of the file and automatically | |
254 | * adjust the settings for this buffer only. This must remain at the end | |
255 | * of the file. | |
256 | * --------------------------------------------------------------------------- | |
257 | * Local variables: | |
258 | * c-indent-level: 4 | |
259 | * c-brace-imaginary-offset: 0 | |
260 | * c-brace-offset: -4 | |
261 | * c-argdecl-indent: 4 | |
262 | * c-label-offset: -4 | |
263 | * c-continued-statement-offset: 4 | |
264 | * c-continued-brace-offset: 0 | |
265 | * indent-tabs-mode: nil | |
266 | * tab-width: 8 | |
267 | * End: | |
268 | */ |