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/bitops.h>
9 #include <linux/genalloc.h>
10 #include <asm/types.h>
11 #include <asm/tpi.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_dev_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 extern void css_schedule_reprobe(void);
360 
361 extern void *cio_dma_zalloc(size_t size);
362 extern void cio_dma_free(void *cpu_addr, size_t size);
363 extern struct device *cio_get_dma_css_dev(void);
364 
365 void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev,
366 			size_t size);
367 void cio_gp_dma_free(struct gen_pool *gp_dma, void *cpu_addr, size_t size);
368 void cio_gp_dma_destroy(struct gen_pool *gp_dma, struct device *dma_dev);
369 struct gen_pool *cio_gp_dma_create(struct device *dma_dev, int nr_pages);
370 
371 /* Function from drivers/s390/cio/chsc.c */
372 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, long *clock_delta);
373 int chsc_sstpi(void *page, void *result, size_t size);
374 int chsc_stzi(void *page, void *result, size_t size);
375 int chsc_sgib(u32 origin);
376 int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid);
377 
378 #endif
379