summaryrefslogtreecommitdiff
path: root/arch/s390/include/asm/cio.h
blob: 5c58756d6476c0edbff3f1b9afce5ee57a126de9 (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
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Common interface for I/O on S/390
 */
#ifndef _ASM_S390_CIO_H_
#define _ASM_S390_CIO_H_

#include <linux/spinlock.h>
#include <linux/bitops.h>
#include <linux/genalloc.h>
#include <asm/types.h>

#define LPM_ANYPATH 0xff
#define __MAX_CSSID 0
#define __MAX_SUBCHANNEL 65535
#define __MAX_SSID 3

#include <asm/scsw.h>

/**
 * struct ccw1 - channel command word
 * @cmd_code: command code
 * @flags: flags, like IDA addressing, etc.
 * @count: byte count
 * @cda: data address
 *
 * The ccw is the basic structure to build channel programs that perform
 * operations with the device or the control unit. Only Format-1 channel
 * command words are supported.
 */
struct ccw1 {
	__u8  cmd_code;
	__u8  flags;
	__u16 count;
	__u32 cda;
} __attribute__ ((packed,aligned(8)));

/**
 * struct ccw0 - channel command word
 * @cmd_code: command code
 * @cda: data address
 * @flags: flags, like IDA addressing, etc.
 * @reserved: will be ignored
 * @count: byte count
 *
 * The format-0 ccw structure.
 */
struct ccw0 {
	__u8 cmd_code;
	__u32 cda : 24;
	__u8  flags;
	__u8  reserved;
	__u16 count;
} __packed __aligned(8);

#define CCW_FLAG_DC		0x80
#define CCW_FLAG_CC		0x40
#define CCW_FLAG_SLI		0x20
#define CCW_FLAG_SKIP		0x10
#define CCW_FLAG_PCI		0x08
#define CCW_FLAG_IDA		0x04
#define CCW_FLAG_SUSPEND	0x02

#define CCW_CMD_READ_IPL	0x02
#define CCW_CMD_NOOP		0x03
#define CCW_CMD_BASIC_SENSE	0x04
#define CCW_CMD_TIC		0x08
#define CCW_CMD_STLCK           0x14
#define CCW_CMD_SENSE_PGID	0x34
#define CCW_CMD_SUSPEND_RECONN	0x5B
#define CCW_CMD_RDC		0x64
#define CCW_CMD_RELEASE		0x94
#define CCW_CMD_SET_PGID	0xAF
#define CCW_CMD_SENSE_ID	0xE4
#define CCW_CMD_DCTL		0xF3

#define SENSE_MAX_COUNT		0x20

/**
 * struct erw - extended report word
 * @res0: reserved
 * @auth: authorization check
 * @pvrf: path-verification-required flag
 * @cpt: channel-path timeout
 * @fsavf: failing storage address validity flag
 * @cons: concurrent sense
 * @scavf: secondary ccw address validity flag
 * @fsaf: failing storage address format
 * @scnt: sense count, if @cons == %1
 * @res16: reserved
 */
struct erw {
	__u32 res0  : 3;
	__u32 auth  : 1;
	__u32 pvrf  : 1;
	__u32 cpt   : 1;
	__u32 fsavf : 1;
	__u32 cons  : 1;
	__u32 scavf : 1;
	__u32 fsaf  : 1;
	__u32 scnt  : 6;
	__u32 res16 : 16;
} __attribute__ ((packed));

/**
 * struct erw_eadm - EADM Subchannel extended report word
 * @b: aob error
 * @r: arsb error
 */
struct erw_eadm {
	__u32 : 16;
	__u32 b : 1;
	__u32 r : 1;
	__u32  : 14;
} __packed;

/**
 * struct sublog - subchannel logout area
 * @res0: reserved
 * @esf: extended status flags
 * @lpum: last path used mask
 * @arep: ancillary report
 * @fvf: field-validity flags
 * @sacc: storage access code
 * @termc: termination code
 * @devsc: device-status check
 * @serr: secondary error
 * @ioerr: i/o-error alert
 * @seqc: sequence code
 */
struct sublog {
	__u32 res0  : 1;
	__u32 esf   : 7;
	__u32 lpum  : 8;
	__u32 arep  : 1;
	__u32 fvf   : 5;
	__u32 sacc  : 2;
	__u32 termc : 2;
	__u32 devsc : 1;
	__u32 serr  : 1;
	__u32 ioerr : 1;
	__u32 seqc  : 3;
} __attribute__ ((packed));

/**
 * struct esw0 - Format 0 Extended Status Word (ESW)
 * @sublog: subchannel logout
 * @erw: extended report word
 * @faddr: failing storage address
 * @saddr: secondary ccw address
 */
struct esw0 {
	struct sublog sublog;
	struct erw erw;
	__u32  faddr[2];
	__u32  saddr;
} __attribute__ ((packed));

/**
 * struct esw1 - Format 1 Extended Status Word (ESW)
 * @zero0: reserved zeros
 * @lpum: last path used mask
 * @zero16: reserved zeros
 * @erw: extended report word
 * @zeros: three fullwords of zeros
 */
struct esw1 {
	__u8  zero0;
	__u8  lpum;
	__u16 zero16;
	struct erw erw;
	__u32 zeros[3];
} __attribute__ ((packed));

/**
 * struct esw2 - Format 2 Extended Status Word (ESW)
 * @zero0: reserved zeros
 * @lpum: last path used mask
 * @dcti: device-connect-time interval
 * @erw: extended report word
 * @zeros: three fullwords of zeros
 */
struct esw2 {
	__u8  zero0;
	__u8  lpum;
	__u16 dcti;
	struct erw erw;
	__u32 zeros[3];
} __attribute__ ((packed));

/**
 * struct esw3 - Format 3 Extended Status Word (ESW)
 * @zero0: reserved zeros
 * @lpum: last path used mask
 * @res: reserved
 * @erw: extended report word
 * @zeros: three fullwords of zeros
 */
struct esw3 {
	__u8  zero0;
	__u8  lpum;
	__u16 res;
	struct erw erw;
	__u32 zeros[3];
} __attribute__ ((packed));

/**
 * struct esw_eadm - EADM Subchannel Extended Status Word (ESW)
 * @sublog: subchannel logout
 * @erw: extended report word
 */
struct esw_eadm {
	__u32 sublog;
	struct erw_eadm erw;
	__u32 : 32;
	__u32 : 32;
	__u32 : 32;
} __packed;

/**
 * struct irb - interruption response block
 * @scsw: subchannel status word
 * @esw: extended status word
 * @ecw: extended control word
 *
 * The irb that is handed to the device driver when an interrupt occurs. For
 * solicited interrupts, the common I/O layer already performs checks whether
 * a field is valid; a field not being valid is always passed as %0.
 * If a unit check occurred, @ecw may contain sense data; this is retrieved
 * by the common I/O layer itself if the device doesn't support concurrent
 * sense (so that the device driver never needs to perform basic sense itself).
 * For unsolicited interrupts, the irb is passed as-is (expect for sense data,
 * if applicable).
 */
struct irb {
	union scsw scsw;
	union {
		struct esw0 esw0;
		struct esw1 esw1;
		struct esw2 esw2;
		struct esw3 esw3;
		struct esw_eadm eadm;
	} esw;
	__u8   ecw[32];
} __attribute__ ((packed,aligned(4)));

/**
 * struct ciw - command information word  (CIW) layout
 * @et: entry type
 * @reserved: reserved bits
 * @ct: command type
 * @cmd: command code
 * @count: command count
 */
struct ciw {
	__u32 et       :  2;
	__u32 reserved :  2;
	__u32 ct       :  4;
	__u32 cmd      :  8;
	__u32 count    : 16;
} __attribute__ ((packed));

#define CIW_TYPE_RCD	0x0    	/* read configuration data */
#define CIW_TYPE_SII	0x1    	/* set interface identifier */
#define CIW_TYPE_RNI	0x2    	/* read node identifier */

/*
 * Node Descriptor as defined in SA22-7204, "Common I/O-Device Commands"
 */

#define ND_VALIDITY_VALID	0
#define ND_VALIDITY_OUTDATED	1
#define ND_VALIDITY_INVALID	2

struct node_descriptor {
	/* Flags. */
	union {
		struct {
			u32 validity:3;
			u32 reserved:5;
		} __packed;
		u8 byte0;
	} __packed;

	/* Node parameters. */
	u32 params:24;

	/* Node ID. */
	char type[6];
	char model[3];
	char manufacturer[3];
	char plant[2];
	char seq[12];
	u16 tag;
} __packed;

/*
 * Flags used as input parameters for do_IO()
 */
#define DOIO_ALLOW_SUSPEND	 0x0001 /* allow for channel prog. suspend */
#define DOIO_DENY_PREFETCH	 0x0002 /* don't allow for CCW prefetch */
#define DOIO_SUPPRESS_INTER	 0x0004 /* suppress intermediate inter. */
					/* ... for suspended CCWs */
/* Device or subchannel gone. */
#define CIO_GONE       0x0001
/* No path to device. */
#define CIO_NO_PATH    0x0002
/* Device has appeared. */
#define CIO_OPER       0x0004
/* Sick revalidation of device. */
#define CIO_REVALIDATE 0x0008
/* Device did not respond in time. */
#define CIO_BOXED      0x0010

/**
 * struct ccw_dev_id - unique identifier for ccw devices
 * @ssid: subchannel set id
 * @devno: device number
 *
 * This structure is not directly based on any hardware structure. The
 * hardware identifies a device by its device number and its subchannel,
 * which is in turn identified by its id. In order to get a unique identifier
 * for ccw devices across subchannel sets, @struct ccw_dev_id has been
 * introduced.
 */
struct ccw_dev_id {
	u8 ssid;
	u16 devno;
};

/**
 * ccw_device_id_is_equal() - compare two ccw_dev_ids
 * @dev_id1: a ccw_dev_id
 * @dev_id2: another ccw_dev_id
 * Returns:
 *  %1 if the two structures are equal field-by-field,
 *  %0 if not.
 * Context:
 *  any
 */
static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1,
				      struct ccw_dev_id *dev_id2)
{
	if ((dev_id1->ssid == dev_id2->ssid) &&
	    (dev_id1->devno == dev_id2->devno))
		return 1;
	return 0;
}

/**
 * pathmask_to_pos() - find the position of the left-most bit in a pathmask
 * @mask: pathmask with at least one bit set
 */
static inline u8 pathmask_to_pos(u8 mask)
{
	return 8 - ffs(mask);
}

extern void css_schedule_reprobe(void);

extern void *cio_dma_zalloc(size_t size);
extern void cio_dma_free(void *cpu_addr, size_t size);
extern struct device *cio_get_dma_css_dev(void);

void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev,
			size_t size);
void cio_gp_dma_free(struct gen_pool *gp_dma, void *cpu_addr, size_t size);
void cio_gp_dma_destroy(struct gen_pool *gp_dma, struct device *dma_dev);
struct gen_pool *cio_gp_dma_create(struct device *dma_dev, int nr_pages);

/* Function from drivers/s390/cio/chsc.c */
int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta);
int chsc_sstpi(void *page, void *result, size_t size);
int chsc_stzi(void *page, void *result, size_t size);
int chsc_sgib(u32 origin);

#endif