1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Common interface for I/O on S/390
4 */
5 #ifndef _ASM_S390_CIO_H_
6 #define _ASM_S390_CIO_H_
7
8 #include <linux/spinlock.h>
9 #include <linux/bitops.h>
10 #include <linux/genalloc.h>
11 #include <asm/types.h>
12
13 #define LPM_ANYPATH 0xff
14 #define __MAX_CSSID 0
15 #define __MAX_SUBCHANNEL 65535
16 #define __MAX_SSID 3
17
18 #include <asm/scsw.h>
19
20 /**
21 * struct ccw1 - channel command word
22 * @cmd_code: command code
23 * @flags: flags, like IDA addressing, etc.
24 * @count: byte count
25 * @cda: data address
26 *
27 * The ccw is the basic structure to build channel programs that perform
28 * operations with the device or the control unit. Only Format-1 channel
29 * command words are supported.
30 */
31 struct ccw1 {
32 __u8 cmd_code;
33 __u8 flags;
34 __u16 count;
35 __u32 cda;
36 } __attribute__ ((packed,aligned(8)));
37
38 /**
39 * struct ccw0 - channel command word
40 * @cmd_code: command code
41 * @cda: data address
42 * @flags: flags, like IDA addressing, etc.
43 * @reserved: will be ignored
44 * @count: byte count
45 *
46 * The format-0 ccw structure.
47 */
48 struct ccw0 {
49 __u8 cmd_code;
50 __u32 cda : 24;
51 __u8 flags;
52 __u8 reserved;
53 __u16 count;
54 } __packed __aligned(8);
55
56 #define CCW_FLAG_DC 0x80
57 #define CCW_FLAG_CC 0x40
58 #define CCW_FLAG_SLI 0x20
59 #define CCW_FLAG_SKIP 0x10
60 #define CCW_FLAG_PCI 0x08
61 #define CCW_FLAG_IDA 0x04
62 #define CCW_FLAG_SUSPEND 0x02
63
64 #define CCW_CMD_READ_IPL 0x02
65 #define CCW_CMD_NOOP 0x03
66 #define CCW_CMD_BASIC_SENSE 0x04
67 #define CCW_CMD_TIC 0x08
68 #define CCW_CMD_STLCK 0x14
69 #define CCW_CMD_SENSE_PGID 0x34
70 #define CCW_CMD_SUSPEND_RECONN 0x5B
71 #define CCW_CMD_RDC 0x64
72 #define CCW_CMD_RELEASE 0x94
73 #define CCW_CMD_SET_PGID 0xAF
74 #define CCW_CMD_SENSE_ID 0xE4
75 #define CCW_CMD_DCTL 0xF3
76
77 #define SENSE_MAX_COUNT 0x20
78
79 /**
80 * struct erw - extended report word
81 * @res0: reserved
82 * @auth: authorization check
83 * @pvrf: path-verification-required flag
84 * @cpt: channel-path timeout
85 * @fsavf: failing storage address validity flag
86 * @cons: concurrent sense
87 * @scavf: secondary ccw address validity flag
88 * @fsaf: failing storage address format
89 * @scnt: sense count, if @cons == %1
90 * @res16: reserved
91 */
92 struct erw {
93 __u32 res0 : 3;
94 __u32 auth : 1;
95 __u32 pvrf : 1;
96 __u32 cpt : 1;
97 __u32 fsavf : 1;
98 __u32 cons : 1;
99 __u32 scavf : 1;
100 __u32 fsaf : 1;
101 __u32 scnt : 6;
102 __u32 res16 : 16;
103 } __attribute__ ((packed));
104
105 /**
106 * struct erw_eadm - EADM Subchannel extended report word
107 * @b: aob error
108 * @r: arsb error
109 */
110 struct erw_eadm {
111 __u32 : 16;
112 __u32 b : 1;
113 __u32 r : 1;
114 __u32 : 14;
115 } __packed;
116
117 /**
118 * struct sublog - subchannel logout area
119 * @res0: reserved
120 * @esf: extended status flags
121 * @lpum: last path used mask
122 * @arep: ancillary report
123 * @fvf: field-validity flags
124 * @sacc: storage access code
125 * @termc: termination code
126 * @devsc: device-status check
127 * @serr: secondary error
128 * @ioerr: i/o-error alert
129 * @seqc: sequence code
130 */
131 struct sublog {
132 __u32 res0 : 1;
133 __u32 esf : 7;
134 __u32 lpum : 8;
135 __u32 arep : 1;
136 __u32 fvf : 5;
137 __u32 sacc : 2;
138 __u32 termc : 2;
139 __u32 devsc : 1;
140 __u32 serr : 1;
141 __u32 ioerr : 1;
142 __u32 seqc : 3;
143 } __attribute__ ((packed));
144
145 /**
146 * struct esw0 - Format 0 Extended Status Word (ESW)
147 * @sublog: subchannel logout
148 * @erw: extended report word
149 * @faddr: failing storage address
150 * @saddr: secondary ccw address
151 */
152 struct esw0 {
153 struct sublog sublog;
154 struct erw erw;
155 __u32 faddr[2];
156 __u32 saddr;
157 } __attribute__ ((packed));
158
159 /**
160 * struct esw1 - Format 1 Extended Status Word (ESW)
161 * @zero0: reserved zeros
162 * @lpum: last path used mask
163 * @zero16: reserved zeros
164 * @erw: extended report word
165 * @zeros: three fullwords of zeros
166 */
167 struct esw1 {
168 __u8 zero0;
169 __u8 lpum;
170 __u16 zero16;
171 struct erw erw;
172 __u32 zeros[3];
173 } __attribute__ ((packed));
174
175 /**
176 * struct esw2 - Format 2 Extended Status Word (ESW)
177 * @zero0: reserved zeros
178 * @lpum: last path used mask
179 * @dcti: device-connect-time interval
180 * @erw: extended report word
181 * @zeros: three fullwords of zeros
182 */
183 struct esw2 {
184 __u8 zero0;
185 __u8 lpum;
186 __u16 dcti;
187 struct erw erw;
188 __u32 zeros[3];
189 } __attribute__ ((packed));
190
191 /**
192 * struct esw3 - Format 3 Extended Status Word (ESW)
193 * @zero0: reserved zeros
194 * @lpum: last path used mask
195 * @res: reserved
196 * @erw: extended report word
197 * @zeros: three fullwords of zeros
198 */
199 struct esw3 {
200 __u8 zero0;
201 __u8 lpum;
202 __u16 res;
203 struct erw erw;
204 __u32 zeros[3];
205 } __attribute__ ((packed));
206
207 /**
208 * struct esw_eadm - EADM Subchannel Extended Status Word (ESW)
209 * @sublog: subchannel logout
210 * @erw: extended report word
211 */
212 struct esw_eadm {
213 __u32 sublog;
214 struct erw_eadm erw;
215 __u32 : 32;
216 __u32 : 32;
217 __u32 : 32;
218 } __packed;
219
220 /**
221 * struct irb - interruption response block
222 * @scsw: subchannel status word
223 * @esw: extended status word
224 * @ecw: extended control word
225 *
226 * The irb that is handed to the device driver when an interrupt occurs. For
227 * solicited interrupts, the common I/O layer already performs checks whether
228 * a field is valid; a field not being valid is always passed as %0.
229 * If a unit check occurred, @ecw may contain sense data; this is retrieved
230 * by the common I/O layer itself if the device doesn't support concurrent
231 * sense (so that the device driver never needs to perform basic sense itself).
232 * For unsolicited interrupts, the irb is passed as-is (expect for sense data,
233 * if applicable).
234 */
235 struct irb {
236 union scsw scsw;
237 union {
238 struct esw0 esw0;
239 struct esw1 esw1;
240 struct esw2 esw2;
241 struct esw3 esw3;
242 struct esw_eadm eadm;
243 } esw;
244 __u8 ecw[32];
245 } __attribute__ ((packed,aligned(4)));
246
247 /**
248 * struct ciw - command information word (CIW) layout
249 * @et: entry type
250 * @reserved: reserved bits
251 * @ct: command type
252 * @cmd: command code
253 * @count: command count
254 */
255 struct ciw {
256 __u32 et : 2;
257 __u32 reserved : 2;
258 __u32 ct : 4;
259 __u32 cmd : 8;
260 __u32 count : 16;
261 } __attribute__ ((packed));
262
263 #define CIW_TYPE_RCD 0x0 /* read configuration data */
264 #define CIW_TYPE_SII 0x1 /* set interface identifier */
265 #define CIW_TYPE_RNI 0x2 /* read node identifier */
266
267 /*
268 * Node Descriptor as defined in SA22-7204, "Common I/O-Device Commands"
269 */
270
271 #define ND_VALIDITY_VALID 0
272 #define ND_VALIDITY_OUTDATED 1
273 #define ND_VALIDITY_INVALID 2
274
275 struct node_descriptor {
276 /* Flags. */
277 union {
278 struct {
279 u32 validity:3;
280 u32 reserved:5;
281 } __packed;
282 u8 byte0;
283 } __packed;
284
285 /* Node parameters. */
286 u32 params:24;
287
288 /* Node ID. */
289 char type[6];
290 char model[3];
291 char manufacturer[3];
292 char plant[2];
293 char seq[12];
294 u16 tag;
295 } __packed;
296
297 /*
298 * Flags used as input parameters for do_IO()
299 */
300 #define DOIO_ALLOW_SUSPEND 0x0001 /* allow for channel prog. suspend */
301 #define DOIO_DENY_PREFETCH 0x0002 /* don't allow for CCW prefetch */
302 #define DOIO_SUPPRESS_INTER 0x0004 /* suppress intermediate inter. */
303 /* ... for suspended CCWs */
304 /* Device or subchannel gone. */
305 #define CIO_GONE 0x0001
306 /* No path to device. */
307 #define CIO_NO_PATH 0x0002
308 /* Device has appeared. */
309 #define CIO_OPER 0x0004
310 /* Sick revalidation of device. */
311 #define CIO_REVALIDATE 0x0008
312 /* Device did not respond in time. */
313 #define CIO_BOXED 0x0010
314
315 /**
316 * struct ccw_dev_id - unique identifier for ccw devices
317 * @ssid: subchannel set id
318 * @devno: device number
319 *
320 * This structure is not directly based on any hardware structure. The
321 * hardware identifies a device by its device number and its subchannel,
322 * which is in turn identified by its id. In order to get a unique identifier
323 * for ccw devices across subchannel sets, @struct ccw_dev_id has been
324 * introduced.
325 */
326 struct ccw_dev_id {
327 u8 ssid;
328 u16 devno;
329 };
330
331 /**
332 * ccw_device_id_is_equal() - compare two ccw_dev_ids
333 * @dev_id1: a ccw_dev_id
334 * @dev_id2: another ccw_dev_id
335 * Returns:
336 * %1 if the two structures are equal field-by-field,
337 * %0 if not.
338 * Context:
339 * any
340 */
ccw_dev_id_is_equal(struct ccw_dev_id * dev_id1,struct ccw_dev_id * dev_id2)341 static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1,
342 struct ccw_dev_id *dev_id2)
343 {
344 if ((dev_id1->ssid == dev_id2->ssid) &&
345 (dev_id1->devno == dev_id2->devno))
346 return 1;
347 return 0;
348 }
349
350 /**
351 * pathmask_to_pos() - find the position of the left-most bit in a pathmask
352 * @mask: pathmask with at least one bit set
353 */
pathmask_to_pos(u8 mask)354 static inline u8 pathmask_to_pos(u8 mask)
355 {
356 return 8 - ffs(mask);
357 }
358
359 void channel_subsystem_reinit(void);
360 extern void css_schedule_reprobe(void);
361
362 extern void *cio_dma_zalloc(size_t size);
363 extern void cio_dma_free(void *cpu_addr, size_t size);
364 extern struct device *cio_get_dma_css_dev(void);
365
366 void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev,
367 size_t size);
368 void cio_gp_dma_free(struct gen_pool *gp_dma, void *cpu_addr, size_t size);
369 void cio_gp_dma_destroy(struct gen_pool *gp_dma, struct device *dma_dev);
370 struct gen_pool *cio_gp_dma_create(struct device *dma_dev, int nr_pages);
371
372 /* Function from drivers/s390/cio/chsc.c */
373 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta);
374 int chsc_sstpi(void *page, void *result, size_t size);
375 int chsc_sgib(u32 origin);
376
377 #endif
378
