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1/*
2 * drivers/s390/char/tape.h
3 * tape device driver for 3480/3490E/3590 tapes.
4 *
5 * S390 and zSeries version
6 * Copyright IBM Corp. 2001, 2009
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Tuan Ngo-Anh <ngoanh@de.ibm.com>
9 * Martin Schwidefsky <schwidefsky@de.ibm.com>
10 * Stefan Bader <shbader@de.ibm.com>
11 */
12
13#ifndef _TAPE_H
14#define _TAPE_H
15
16#include <asm/ccwdev.h>
17#include <asm/debug.h>
18#include <asm/idals.h>
19#include <linux/blkdev.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/mtio.h>
23#include <linux/interrupt.h>
24#include <linux/workqueue.h>
25
26struct gendisk;
27
28/*
29 * Define DBF_LIKE_HELL for lots of messages in the debug feature.
30 */
31#define DBF_LIKE_HELL
32#ifdef DBF_LIKE_HELL
33#define DBF_LH(level, str, ...) \
34do { \
35 debug_sprintf_event(TAPE_DBF_AREA, level, str, ## __VA_ARGS__); \
36} while (0)
37#else
38#define DBF_LH(level, str, ...) do {} while(0)
39#endif
40
41/*
42 * macros s390 debug feature (dbf)
43 */
44#define DBF_EVENT(d_level, d_str...) \
45do { \
46 debug_sprintf_event(TAPE_DBF_AREA, d_level, d_str); \
47} while (0)
48
49#define DBF_EXCEPTION(d_level, d_str...) \
50do { \
51 debug_sprintf_exception(TAPE_DBF_AREA, d_level, d_str); \
52} while (0)
53
54#define TAPE_VERSION_MAJOR 2
55#define TAPE_VERSION_MINOR 0
56#define TAPE_MAGIC "tape"
57
58#define TAPE_MINORS_PER_DEV 2 /* two minors per device */
59#define TAPEBLOCK_HSEC_SIZE 2048
60#define TAPEBLOCK_HSEC_S2B 2
61#define TAPEBLOCK_RETRIES 5
62
63enum tape_medium_state {
64 MS_UNKNOWN,
65 MS_LOADED,
66 MS_UNLOADED,
67 MS_SIZE
68};
69
70enum tape_state {
71 TS_UNUSED=0,
72 TS_IN_USE,
73 TS_BLKUSE,
74 TS_INIT,
75 TS_NOT_OPER,
76 TS_SIZE
77};
78
79enum tape_op {
80 TO_BLOCK, /* Block read */
81 TO_BSB, /* Backward space block */
82 TO_BSF, /* Backward space filemark */
83 TO_DSE, /* Data security erase */
84 TO_FSB, /* Forward space block */
85 TO_FSF, /* Forward space filemark */
86 TO_LBL, /* Locate block label */
87 TO_NOP, /* No operation */
88 TO_RBA, /* Read backward */
89 TO_RBI, /* Read block information */
90 TO_RFO, /* Read forward */
91 TO_REW, /* Rewind tape */
92 TO_RUN, /* Rewind and unload tape */
93 TO_WRI, /* Write block */
94 TO_WTM, /* Write tape mark */
95 TO_MSEN, /* Medium sense */
96 TO_LOAD, /* Load tape */
97 TO_READ_CONFIG, /* Read configuration data */
98 TO_READ_ATTMSG, /* Read attention message */
99 TO_DIS, /* Tape display */
100 TO_ASSIGN, /* Assign tape to channel path */
101 TO_UNASSIGN, /* Unassign tape from channel path */
102 TO_CRYPT_ON, /* Enable encrpytion */
103 TO_CRYPT_OFF, /* Disable encrpytion */
104 TO_KEKL_SET, /* Set KEK label */
105 TO_KEKL_QUERY, /* Query KEK label */
106 TO_RDC, /* Read device characteristics */
107 TO_SIZE, /* #entries in tape_op_t */
108};
109
110/* Forward declaration */
111struct tape_device;
112
113/* tape_request->status can be: */
114enum tape_request_status {
115 TAPE_REQUEST_INIT, /* request is ready to be processed */
116 TAPE_REQUEST_QUEUED, /* request is queued to be processed */
117 TAPE_REQUEST_IN_IO, /* request is currently in IO */
118 TAPE_REQUEST_DONE, /* request is completed. */
119 TAPE_REQUEST_CANCEL, /* request should be canceled. */
120 TAPE_REQUEST_LONG_BUSY, /* request has to be restarted after long busy */
121};
122
123/* Tape CCW request */
124struct tape_request {
125 struct list_head list; /* list head for request queueing. */
126 struct tape_device *device; /* tape device of this request */
127 struct ccw1 *cpaddr; /* address of the channel program. */
128 void *cpdata; /* pointer to ccw data. */
129 enum tape_request_status status;/* status of this request */
130 int options; /* options for execution. */
131 int retries; /* retry counter for error recovery. */
132 int rescnt; /* residual count from devstat. */
133
134 /* Callback for delivering final status. */
135 void (*callback)(struct tape_request *, void *);
136 void *callback_data;
137
138 enum tape_op op;
139 int rc;
140};
141
142/* Function type for magnetic tape commands */
143typedef int (*tape_mtop_fn)(struct tape_device *, int);
144
145/* Size of the array containing the mtops for a discipline */
146#define TAPE_NR_MTOPS (MTMKPART+1)
147
148/* Tape Discipline */
149struct tape_discipline {
150 struct module *owner;
151 int (*setup_device)(struct tape_device *);
152 void (*cleanup_device)(struct tape_device *);
153 int (*irq)(struct tape_device *, struct tape_request *, struct irb *);
154 struct tape_request *(*read_block)(struct tape_device *, size_t);
155 struct tape_request *(*write_block)(struct tape_device *, size_t);
156 void (*process_eov)(struct tape_device*);
157#ifdef CONFIG_S390_TAPE_BLOCK
158 /* Block device stuff. */
159 struct tape_request *(*bread)(struct tape_device *, struct request *);
160 void (*check_locate)(struct tape_device *, struct tape_request *);
161 void (*free_bread)(struct tape_request *);
162#endif
163 /* ioctl function for additional ioctls. */
164 int (*ioctl_fn)(struct tape_device *, unsigned int, unsigned long);
165 /* Array of tape commands with TAPE_NR_MTOPS entries */
166 tape_mtop_fn *mtop_array;
167};
168
169/*
170 * The discipline irq function either returns an error code (<0) which
171 * means that the request has failed with an error or one of the following:
172 */
173#define TAPE_IO_SUCCESS 0 /* request successful */
174#define TAPE_IO_PENDING 1 /* request still running */
175#define TAPE_IO_RETRY 2 /* retry to current request */
176#define TAPE_IO_STOP 3 /* stop the running request */
177#define TAPE_IO_LONG_BUSY 4 /* delay the running request */
178
179/* Char Frontend Data */
180struct tape_char_data {
181 struct idal_buffer *idal_buf; /* idal buffer for user char data */
182 int block_size; /* of size block_size. */
183};
184
185#ifdef CONFIG_S390_TAPE_BLOCK
186/* Block Frontend Data */
187struct tape_blk_data
188{
189 struct tape_device * device;
190 /* Block device request queue. */
191 struct request_queue * request_queue;
192 spinlock_t request_queue_lock;
193
194 /* Task to move entries from block request to CCS request queue. */
195 struct work_struct requeue_task;
196 atomic_t requeue_scheduled;
197
198 /* Current position on the tape. */
199 long block_position;
200 int medium_changed;
201 struct gendisk * disk;
202};
203#endif
204
205/* Tape Info */
206struct tape_device {
207 /* entry in tape_device_list */
208 struct list_head node;
209
210 int cdev_id;
211 struct ccw_device * cdev;
212 struct tape_class_device * nt;
213 struct tape_class_device * rt;
214
215 /* Device mutex to serialize tape commands. */
216 struct mutex mutex;
217
218 /* Device discipline information. */
219 struct tape_discipline * discipline;
220 void * discdata;
221
222 /* Generic status flags */
223 long tape_generic_status;
224
225 /* Device state information. */
226 wait_queue_head_t state_change_wq;
227 enum tape_state tape_state;
228 enum tape_medium_state medium_state;
229 unsigned char * modeset_byte;
230
231 /* Reference count. */
232 atomic_t ref_count;
233
234 /* Request queue. */
235 struct list_head req_queue;
236
237 /* Request wait queue. */
238 wait_queue_head_t wait_queue;
239
240 /* Each tape device has (currently) two minor numbers. */
241 int first_minor;
242
243 /* Number of tapemarks required for correct termination. */
244 int required_tapemarks;
245
246 /* Block ID of the BOF */
247 unsigned int bof;
248
249 /* Character device frontend data */
250 struct tape_char_data char_data;
251#ifdef CONFIG_S390_TAPE_BLOCK
252 /* Block dev frontend data */
253 struct tape_blk_data blk_data;
254#endif
255
256 /* Function to start or stop the next request later. */
257 struct delayed_work tape_dnr;
258
259 /* Timer for long busy */
260 struct timer_list lb_timeout;
261
262};
263
264/* Externals from tape_core.c */
265extern struct tape_request *tape_alloc_request(int cplength, int datasize);
266extern void tape_free_request(struct tape_request *);
267extern int tape_do_io(struct tape_device *, struct tape_request *);
268extern int tape_do_io_async(struct tape_device *, struct tape_request *);
269extern int tape_do_io_interruptible(struct tape_device *, struct tape_request *);
270extern int tape_cancel_io(struct tape_device *, struct tape_request *);
271void tape_hotplug_event(struct tape_device *, int major, int action);
272
273static inline int
274tape_do_io_free(struct tape_device *device, struct tape_request *request)
275{
276 int rc;
277
278 rc = tape_do_io(device, request);
279 tape_free_request(request);
280 return rc;
281}
282
283static inline void
284tape_do_io_async_free(struct tape_device *device, struct tape_request *request)
285{
286 request->callback = (void *) tape_free_request;
287 request->callback_data = NULL;
288 tape_do_io_async(device, request);
289}
290
291extern int tape_oper_handler(int irq, int status);
292extern void tape_noper_handler(int irq, int status);
293extern int tape_open(struct tape_device *);
294extern int tape_release(struct tape_device *);
295extern int tape_mtop(struct tape_device *, int, int);
296extern void tape_state_set(struct tape_device *, enum tape_state);
297
298extern int tape_generic_online(struct tape_device *, struct tape_discipline *);
299extern int tape_generic_offline(struct ccw_device *);
300extern int tape_generic_pm_suspend(struct ccw_device *);
301
302/* Externals from tape_devmap.c */
303extern int tape_generic_probe(struct ccw_device *);
304extern void tape_generic_remove(struct ccw_device *);
305
306extern struct tape_device *tape_find_device(int devindex);
307extern struct tape_device *tape_get_device(struct tape_device *);
308extern void tape_put_device(struct tape_device *);
309
310/* Externals from tape_char.c */
311extern int tapechar_init(void);
312extern void tapechar_exit(void);
313extern int tapechar_setup_device(struct tape_device *);
314extern void tapechar_cleanup_device(struct tape_device *);
315
316/* Externals from tape_block.c */
317#ifdef CONFIG_S390_TAPE_BLOCK
318extern int tapeblock_init (void);
319extern void tapeblock_exit(void);
320extern int tapeblock_setup_device(struct tape_device *);
321extern void tapeblock_cleanup_device(struct tape_device *);
322#else
323static inline int tapeblock_init (void) {return 0;}
324static inline void tapeblock_exit (void) {;}
325static inline int tapeblock_setup_device(struct tape_device *t) {return 0;}
326static inline void tapeblock_cleanup_device (struct tape_device *t) {;}
327#endif
328
329/* tape initialisation functions */
330#ifdef CONFIG_PROC_FS
331extern void tape_proc_init (void);
332extern void tape_proc_cleanup (void);
333#else
334static inline void tape_proc_init (void) {;}
335static inline void tape_proc_cleanup (void) {;}
336#endif
337
338/* a function for dumping device sense info */
339extern void tape_dump_sense_dbf(struct tape_device *, struct tape_request *,
340 struct irb *);
341
342/* functions for handling the status of a device */
343extern void tape_med_state_set(struct tape_device *, enum tape_medium_state);
344
345/* The debug area */
346extern debug_info_t *TAPE_DBF_AREA;
347
348/* functions for building ccws */
349static inline struct ccw1 *
350tape_ccw_cc(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda)
351{
352 ccw->cmd_code = cmd_code;
353 ccw->flags = CCW_FLAG_CC;
354 ccw->count = memsize;
355 ccw->cda = (__u32)(addr_t) cda;
356 return ccw + 1;
357}
358
359static inline struct ccw1 *
360tape_ccw_end(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda)
361{
362 ccw->cmd_code = cmd_code;
363 ccw->flags = 0;
364 ccw->count = memsize;
365 ccw->cda = (__u32)(addr_t) cda;
366 return ccw + 1;
367}
368
369static inline struct ccw1 *
370tape_ccw_cmd(struct ccw1 *ccw, __u8 cmd_code)
371{
372 ccw->cmd_code = cmd_code;
373 ccw->flags = 0;
374 ccw->count = 0;
375 ccw->cda = (__u32)(addr_t) &ccw->cmd_code;
376 return ccw + 1;
377}
378
379static inline struct ccw1 *
380tape_ccw_repeat(struct ccw1 *ccw, __u8 cmd_code, int count)
381{
382 while (count-- > 0) {
383 ccw->cmd_code = cmd_code;
384 ccw->flags = CCW_FLAG_CC;
385 ccw->count = 0;
386 ccw->cda = (__u32)(addr_t) &ccw->cmd_code;
387 ccw++;
388 }
389 return ccw;
390}
391
392static inline struct ccw1 *
393tape_ccw_cc_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal)
394{
395 ccw->cmd_code = cmd_code;
396 ccw->flags = CCW_FLAG_CC;
397 idal_buffer_set_cda(idal, ccw);
398 return ccw++;
399}
400
401static inline struct ccw1 *
402tape_ccw_end_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal)
403{
404 ccw->cmd_code = cmd_code;
405 ccw->flags = 0;
406 idal_buffer_set_cda(idal, ccw);
407 return ccw++;
408}
409
410/* Global vars */
411extern const char *tape_state_verbose[];
412extern const char *tape_op_verbose[];
413
414#endif /* for ifdef tape.h */