1 /*
2 * Common interface for I/O on S/390
3 */
4 #ifndef _ASM_S390_CIO_H_
5 #define _ASM_S390_CIO_H_
6
7 #include <linux/spinlock.h>
8 #include <linux/bitops.h>
9 #include <asm/types.h>
10
11 #define LPM_ANYPATH 0xff
12 #define __MAX_CSSID 0
13 #define __MAX_SUBCHANNEL 65535
14 #define __MAX_SSID 3
15
16 #include <asm/scsw.h>
17
18 /**
19 * struct ccw1 - channel command word
20 * @cmd_code: command code
21 * @flags: flags, like IDA addressing, etc.
22 * @count: byte count
23 * @cda: data address
24 *
25 * The ccw is the basic structure to build channel programs that perform
26 * operations with the device or the control unit. Only Format-1 channel
27 * command words are supported.
28 */
29 struct ccw1 {
30 __u8 cmd_code;
31 __u8 flags;
32 __u16 count;
33 __u32 cda;
34 } __attribute__ ((packed,aligned(8)));
35
36 #define CCW_FLAG_DC 0x80
37 #define CCW_FLAG_CC 0x40
38 #define CCW_FLAG_SLI 0x20
39 #define CCW_FLAG_SKIP 0x10
40 #define CCW_FLAG_PCI 0x08
41 #define CCW_FLAG_IDA 0x04
42 #define CCW_FLAG_SUSPEND 0x02
43
44 #define CCW_CMD_READ_IPL 0x02
45 #define CCW_CMD_NOOP 0x03
46 #define CCW_CMD_BASIC_SENSE 0x04
47 #define CCW_CMD_TIC 0x08
48 #define CCW_CMD_STLCK 0x14
49 #define CCW_CMD_SENSE_PGID 0x34
50 #define CCW_CMD_SUSPEND_RECONN 0x5B
51 #define CCW_CMD_RDC 0x64
52 #define CCW_CMD_RELEASE 0x94
53 #define CCW_CMD_SET_PGID 0xAF
54 #define CCW_CMD_SENSE_ID 0xE4
55 #define CCW_CMD_DCTL 0xF3
56
57 #define SENSE_MAX_COUNT 0x20
58
59 /**
60 * struct erw - extended report word
61 * @res0: reserved
62 * @auth: authorization check
63 * @pvrf: path-verification-required flag
64 * @cpt: channel-path timeout
65 * @fsavf: failing storage address validity flag
66 * @cons: concurrent sense
67 * @scavf: secondary ccw address validity flag
68 * @fsaf: failing storage address format
69 * @scnt: sense count, if @cons == %1
70 * @res16: reserved
71 */
72 struct erw {
73 __u32 res0 : 3;
74 __u32 auth : 1;
75 __u32 pvrf : 1;
76 __u32 cpt : 1;
77 __u32 fsavf : 1;
78 __u32 cons : 1;
79 __u32 scavf : 1;
80 __u32 fsaf : 1;
81 __u32 scnt : 6;
82 __u32 res16 : 16;
83 } __attribute__ ((packed));
84
85 /**
86 * struct erw_eadm - EADM Subchannel extended report word
87 * @b: aob error
88 * @r: arsb error
89 */
90 struct erw_eadm {
91 __u32 : 16;
92 __u32 b : 1;
93 __u32 r : 1;
94 __u32 : 14;
95 } __packed;
96
97 /**
98 * struct sublog - subchannel logout area
99 * @res0: reserved
100 * @esf: extended status flags
101 * @lpum: last path used mask
102 * @arep: ancillary report
103 * @fvf: field-validity flags
104 * @sacc: storage access code
105 * @termc: termination code
106 * @devsc: device-status check
107 * @serr: secondary error
108 * @ioerr: i/o-error alert
109 * @seqc: sequence code
110 */
111 struct sublog {
112 __u32 res0 : 1;
113 __u32 esf : 7;
114 __u32 lpum : 8;
115 __u32 arep : 1;
116 __u32 fvf : 5;
117 __u32 sacc : 2;
118 __u32 termc : 2;
119 __u32 devsc : 1;
120 __u32 serr : 1;
121 __u32 ioerr : 1;
122 __u32 seqc : 3;
123 } __attribute__ ((packed));
124
125 /**
126 * struct esw0 - Format 0 Extended Status Word (ESW)
127 * @sublog: subchannel logout
128 * @erw: extended report word
129 * @faddr: failing storage address
130 * @saddr: secondary ccw address
131 */
132 struct esw0 {
133 struct sublog sublog;
134 struct erw erw;
135 __u32 faddr[2];
136 __u32 saddr;
137 } __attribute__ ((packed));
138
139 /**
140 * struct esw1 - Format 1 Extended Status Word (ESW)
141 * @zero0: reserved zeros
142 * @lpum: last path used mask
143 * @zero16: reserved zeros
144 * @erw: extended report word
145 * @zeros: three fullwords of zeros
146 */
147 struct esw1 {
148 __u8 zero0;
149 __u8 lpum;
150 __u16 zero16;
151 struct erw erw;
152 __u32 zeros[3];
153 } __attribute__ ((packed));
154
155 /**
156 * struct esw2 - Format 2 Extended Status Word (ESW)
157 * @zero0: reserved zeros
158 * @lpum: last path used mask
159 * @dcti: device-connect-time interval
160 * @erw: extended report word
161 * @zeros: three fullwords of zeros
162 */
163 struct esw2 {
164 __u8 zero0;
165 __u8 lpum;
166 __u16 dcti;
167 struct erw erw;
168 __u32 zeros[3];
169 } __attribute__ ((packed));
170
171 /**
172 * struct esw3 - Format 3 Extended Status Word (ESW)
173 * @zero0: reserved zeros
174 * @lpum: last path used mask
175 * @res: reserved
176 * @erw: extended report word
177 * @zeros: three fullwords of zeros
178 */
179 struct esw3 {
180 __u8 zero0;
181 __u8 lpum;
182 __u16 res;
183 struct erw erw;
184 __u32 zeros[3];
185 } __attribute__ ((packed));
186
187 /**
188 * struct esw_eadm - EADM Subchannel Extended Status Word (ESW)
189 * @sublog: subchannel logout
190 * @erw: extended report word
191 */
192 struct esw_eadm {
193 __u32 sublog;
194 struct erw_eadm erw;
195 __u32 : 32;
196 __u32 : 32;
197 __u32 : 32;
198 } __packed;
199
200 /**
201 * struct irb - interruption response block
202 * @scsw: subchannel status word
203 * @esw: extended status word
204 * @ecw: extended control word
205 *
206 * The irb that is handed to the device driver when an interrupt occurs. For
207 * solicited interrupts, the common I/O layer already performs checks whether
208 * a field is valid; a field not being valid is always passed as %0.
209 * If a unit check occurred, @ecw may contain sense data; this is retrieved
210 * by the common I/O layer itself if the device doesn't support concurrent
211 * sense (so that the device driver never needs to perform basic sene itself).
212 * For unsolicited interrupts, the irb is passed as-is (expect for sense data,
213 * if applicable).
214 */
215 struct irb {
216 union scsw scsw;
217 union {
218 struct esw0 esw0;
219 struct esw1 esw1;
220 struct esw2 esw2;
221 struct esw3 esw3;
222 struct esw_eadm eadm;
223 } esw;
224 __u8 ecw[32];
225 } __attribute__ ((packed,aligned(4)));
226
227 /**
228 * struct ciw - command information word (CIW) layout
229 * @et: entry type
230 * @reserved: reserved bits
231 * @ct: command type
232 * @cmd: command code
233 * @count: command count
234 */
235 struct ciw {
236 __u32 et : 2;
237 __u32 reserved : 2;
238 __u32 ct : 4;
239 __u32 cmd : 8;
240 __u32 count : 16;
241 } __attribute__ ((packed));
242
243 #define CIW_TYPE_RCD 0x0 /* read configuration data */
244 #define CIW_TYPE_SII 0x1 /* set interface identifier */
245 #define CIW_TYPE_RNI 0x2 /* read node identifier */
246
247 /*
248 * Flags used as input parameters for do_IO()
249 */
250 #define DOIO_ALLOW_SUSPEND 0x0001 /* allow for channel prog. suspend */
251 #define DOIO_DENY_PREFETCH 0x0002 /* don't allow for CCW prefetch */
252 #define DOIO_SUPPRESS_INTER 0x0004 /* suppress intermediate inter. */
253 /* ... for suspended CCWs */
254 /* Device or subchannel gone. */
255 #define CIO_GONE 0x0001
256 /* No path to device. */
257 #define CIO_NO_PATH 0x0002
258 /* Device has appeared. */
259 #define CIO_OPER 0x0004
260 /* Sick revalidation of device. */
261 #define CIO_REVALIDATE 0x0008
262 /* Device did not respond in time. */
263 #define CIO_BOXED 0x0010
264
265 /**
266 * struct ccw_dev_id - unique identifier for ccw devices
267 * @ssid: subchannel set id
268 * @devno: device number
269 *
270 * This structure is not directly based on any hardware structure. The
271 * hardware identifies a device by its device number and its subchannel,
272 * which is in turn identified by its id. In order to get a unique identifier
273 * for ccw devices across subchannel sets, @struct ccw_dev_id has been
274 * introduced.
275 */
276 struct ccw_dev_id {
277 u8 ssid;
278 u16 devno;
279 };
280
281 /**
282 * ccw_device_id_is_equal() - compare two ccw_dev_ids
283 * @dev_id1: a ccw_dev_id
284 * @dev_id2: another ccw_dev_id
285 * Returns:
286 * %1 if the two structures are equal field-by-field,
287 * %0 if not.
288 * Context:
289 * any
290 */
ccw_dev_id_is_equal(struct ccw_dev_id * dev_id1,struct ccw_dev_id * dev_id2)291 static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1,
292 struct ccw_dev_id *dev_id2)
293 {
294 if ((dev_id1->ssid == dev_id2->ssid) &&
295 (dev_id1->devno == dev_id2->devno))
296 return 1;
297 return 0;
298 }
299
300 /**
301 * pathmask_to_pos() - find the position of the left-most bit in a pathmask
302 * @mask: pathmask with at least one bit set
303 */
pathmask_to_pos(u8 mask)304 static inline u8 pathmask_to_pos(u8 mask)
305 {
306 return 8 - ffs(mask);
307 }
308
309 void channel_subsystem_reinit(void);
310 extern void css_schedule_reprobe(void);
311
312 extern void reipl_ccw_dev(struct ccw_dev_id *id);
313
314 struct cio_iplinfo {
315 u8 ssid;
316 u16 devno;
317 int is_qdio;
318 };
319
320 extern int cio_get_iplinfo(struct cio_iplinfo *iplinfo);
321
322 /* Function from drivers/s390/cio/chsc.c */
323 int chsc_sstpc(void *page, unsigned int op, u16 ctrl);
324 int chsc_sstpi(void *page, void *result, size_t size);
325
326 #endif
327