1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 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/kernel.h> 20#include <linux/module.h> 21#include <linux/mtio.h> 22#include <linux/interrupt.h> 23#include <linux/workqueue.h> 24 25struct gendisk; 26 27/* 28 * Define DBF_LIKE_HELL for lots of messages in the debug feature. 29 */ 30#define DBF_LIKE_HELL 31#ifdef DBF_LIKE_HELL 32#define DBF_LH(level, str, ...) \ 33do { \ 34 debug_sprintf_event(TAPE_DBF_AREA, level, str, ## __VA_ARGS__); \ 35} while (0) 36#else 37#define DBF_LH(level, str, ...) do {} while(0) 38#endif 39 40/* 41 * macros s390 debug feature (dbf) 42 */ 43#define DBF_EVENT(d_level, d_str...) \ 44do { \ 45 debug_sprintf_event(TAPE_DBF_AREA, d_level, d_str); \ 46} while (0) 47 48#define DBF_EXCEPTION(d_level, d_str...) \ 49do { \ 50 debug_sprintf_exception(TAPE_DBF_AREA, d_level, d_str); \ 51} while (0) 52 53#define TAPE_VERSION_MAJOR 2 54#define TAPE_VERSION_MINOR 0 55#define TAPE_MAGIC "tape" 56 57#define TAPE_MINORS_PER_DEV 2 /* two minors per device */ 58#define TAPEBLOCK_HSEC_SIZE 2048 59#define TAPEBLOCK_HSEC_S2B 2 60#define TAPEBLOCK_RETRIES 5 61 62enum tape_medium_state { 63 MS_UNKNOWN, 64 MS_LOADED, 65 MS_UNLOADED, 66 MS_SIZE 67}; 68 69enum tape_state { 70 TS_UNUSED=0, 71 TS_IN_USE, 72 TS_BLKUSE, 73 TS_INIT, 74 TS_NOT_OPER, 75 TS_SIZE 76}; 77 78enum tape_op { 79 TO_BLOCK, /* Block read */ 80 TO_BSB, /* Backward space block */ 81 TO_BSF, /* Backward space filemark */ 82 TO_DSE, /* Data security erase */ 83 TO_FSB, /* Forward space block */ 84 TO_FSF, /* Forward space filemark */ 85 TO_LBL, /* Locate block label */ 86 TO_NOP, /* No operation */ 87 TO_RBA, /* Read backward */ 88 TO_RBI, /* Read block information */ 89 TO_RFO, /* Read forward */ 90 TO_REW, /* Rewind tape */ 91 TO_RUN, /* Rewind and unload tape */ 92 TO_WRI, /* Write block */ 93 TO_WTM, /* Write tape mark */ 94 TO_MSEN, /* Medium sense */ 95 TO_LOAD, /* Load tape */ 96 TO_READ_CONFIG, /* Read configuration data */ 97 TO_READ_ATTMSG, /* Read attention message */ 98 TO_DIS, /* Tape display */ 99 TO_ASSIGN, /* Assign tape to channel path */ 100 TO_UNASSIGN, /* Unassign tape from channel path */ 101 TO_CRYPT_ON, /* Enable encrpytion */ 102 TO_CRYPT_OFF, /* Disable encrpytion */ 103 TO_KEKL_SET, /* Set KEK label */ 104 TO_KEKL_QUERY, /* Query KEK label */ 105 TO_RDC, /* Read device characteristics */ 106 TO_SIZE, /* #entries in tape_op_t */ 107}; 108 109/* Forward declaration */ 110struct tape_device; 111 112/* tape_request->status can be: */ 113enum tape_request_status { 114 TAPE_REQUEST_INIT, /* request is ready to be processed */ 115 TAPE_REQUEST_QUEUED, /* request is queued to be processed */ 116 TAPE_REQUEST_IN_IO, /* request is currently in IO */ 117 TAPE_REQUEST_DONE, /* request is completed. */ 118 TAPE_REQUEST_CANCEL, /* request should be canceled. */ 119 TAPE_REQUEST_LONG_BUSY, /* request has to be restarted after long busy */ 120}; 121 122/* Tape CCW request */ 123struct tape_request { 124 struct list_head list; /* list head for request queueing. */ 125 struct tape_device *device; /* tape device of this request */ 126 struct ccw1 *cpaddr; /* address of the channel program. */ 127 void *cpdata; /* pointer to ccw data. */ 128 enum tape_request_status status;/* status of this request */ 129 int options; /* options for execution. */ 130 int retries; /* retry counter for error recovery. */ 131 int rescnt; /* residual count from devstat. */ 132 struct timer_list timer; /* timer for std_assign_timeout(). */ 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 /* ioctl function for additional ioctls. */ 158 int (*ioctl_fn)(struct tape_device *, unsigned int, unsigned long); 159 /* Array of tape commands with TAPE_NR_MTOPS entries */ 160 tape_mtop_fn *mtop_array; 161}; 162 163/* 164 * The discipline irq function either returns an error code (<0) which 165 * means that the request has failed with an error or one of the following: 166 */ 167#define TAPE_IO_SUCCESS 0 /* request successful */ 168#define TAPE_IO_PENDING 1 /* request still running */ 169#define TAPE_IO_RETRY 2 /* retry to current request */ 170#define TAPE_IO_STOP 3 /* stop the running request */ 171#define TAPE_IO_LONG_BUSY 4 /* delay the running request */ 172 173/* Char Frontend Data */ 174struct tape_char_data { 175 struct idal_buffer *idal_buf; /* idal buffer for user char data */ 176 int block_size; /* of size block_size. */ 177}; 178 179/* Tape Info */ 180struct tape_device { 181 /* entry in tape_device_list */ 182 struct list_head node; 183 184 int cdev_id; 185 struct ccw_device * cdev; 186 struct tape_class_device * nt; 187 struct tape_class_device * rt; 188 189 /* Device mutex to serialize tape commands. */ 190 struct mutex mutex; 191 192 /* Device discipline information. */ 193 struct tape_discipline * discipline; 194 void * discdata; 195 196 /* Generic status flags */ 197 long tape_generic_status; 198 199 /* Device state information. */ 200 wait_queue_head_t state_change_wq; 201 enum tape_state tape_state; 202 enum tape_medium_state medium_state; 203 unsigned char * modeset_byte; 204 205 /* Reference count. */ 206 atomic_t ref_count; 207 208 /* Request queue. */ 209 struct list_head req_queue; 210 211 /* Request wait queue. */ 212 wait_queue_head_t wait_queue; 213 214 /* Each tape device has (currently) two minor numbers. */ 215 int first_minor; 216 217 /* Number of tapemarks required for correct termination. */ 218 int required_tapemarks; 219 220 /* Block ID of the BOF */ 221 unsigned int bof; 222 223 /* Character device frontend data */ 224 struct tape_char_data char_data; 225 226 /* Function to start or stop the next request later. */ 227 struct delayed_work tape_dnr; 228 229 /* Timer for long busy */ 230 struct timer_list lb_timeout; 231 232}; 233 234/* Externals from tape_core.c */ 235extern struct tape_request *tape_alloc_request(int cplength, int datasize); 236extern void tape_free_request(struct tape_request *); 237extern int tape_do_io(struct tape_device *, struct tape_request *); 238extern int tape_do_io_async(struct tape_device *, struct tape_request *); 239extern int tape_do_io_interruptible(struct tape_device *, struct tape_request *); 240extern int tape_cancel_io(struct tape_device *, struct tape_request *); 241 242static inline int 243tape_do_io_free(struct tape_device *device, struct tape_request *request) 244{ 245 int rc; 246 247 rc = tape_do_io(device, request); 248 tape_free_request(request); 249 return rc; 250} 251 252static inline void 253tape_do_io_async_free(struct tape_device *device, struct tape_request *request) 254{ 255 request->callback = (void *) tape_free_request; 256 request->callback_data = NULL; 257 tape_do_io_async(device, request); 258} 259 260extern int tape_open(struct tape_device *); 261extern int tape_release(struct tape_device *); 262extern int tape_mtop(struct tape_device *, int, int); 263extern void tape_state_set(struct tape_device *, enum tape_state); 264 265extern int tape_generic_online(struct tape_device *, struct tape_discipline *); 266extern int tape_generic_offline(struct ccw_device *); 267 268/* Externals from tape_devmap.c */ 269extern int tape_generic_probe(struct ccw_device *); 270extern void tape_generic_remove(struct ccw_device *); 271 272extern struct tape_device *tape_find_device(int devindex); 273extern struct tape_device *tape_get_device(struct tape_device *); 274extern void tape_put_device(struct tape_device *); 275 276/* Externals from tape_char.c */ 277extern int tapechar_init(void); 278extern void tapechar_exit(void); 279extern int tapechar_setup_device(struct tape_device *); 280extern void tapechar_cleanup_device(struct tape_device *); 281 282/* tape initialisation functions */ 283#ifdef CONFIG_PROC_FS 284extern void tape_proc_init (void); 285extern void tape_proc_cleanup (void); 286#else 287static inline void tape_proc_init (void) {;} 288static inline void tape_proc_cleanup (void) {;} 289#endif 290 291/* a function for dumping device sense info */ 292extern void tape_dump_sense_dbf(struct tape_device *, struct tape_request *, 293 struct irb *); 294 295/* functions for handling the status of a device */ 296extern void tape_med_state_set(struct tape_device *, enum tape_medium_state); 297 298/* The debug area */ 299extern debug_info_t *TAPE_DBF_AREA; 300 301/* functions for building ccws */ 302static inline struct ccw1 * 303tape_ccw_cc(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda) 304{ 305 ccw->cmd_code = cmd_code; 306 ccw->flags = CCW_FLAG_CC; 307 ccw->count = memsize; 308 ccw->cda = 0; 309 if (cda) 310 ccw->cda = virt_to_dma32(cda); 311 return ccw + 1; 312} 313 314static inline struct ccw1 * 315tape_ccw_end(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda) 316{ 317 ccw->cmd_code = cmd_code; 318 ccw->flags = 0; 319 ccw->count = memsize; 320 ccw->cda = 0; 321 if (cda) 322 ccw->cda = virt_to_dma32(cda); 323 return ccw + 1; 324} 325 326static inline struct ccw1 * 327tape_ccw_cmd(struct ccw1 *ccw, __u8 cmd_code) 328{ 329 ccw->cmd_code = cmd_code; 330 ccw->flags = 0; 331 ccw->count = 0; 332 ccw->cda = virt_to_dma32(&ccw->cmd_code); 333 return ccw + 1; 334} 335 336static inline struct ccw1 * 337tape_ccw_repeat(struct ccw1 *ccw, __u8 cmd_code, int count) 338{ 339 while (count-- > 0) { 340 ccw->cmd_code = cmd_code; 341 ccw->flags = CCW_FLAG_CC; 342 ccw->count = 0; 343 ccw->cda = virt_to_dma32(&ccw->cmd_code); 344 ccw++; 345 } 346 return ccw; 347} 348 349static inline struct ccw1 * 350tape_ccw_cc_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal) 351{ 352 ccw->cmd_code = cmd_code; 353 ccw->flags = CCW_FLAG_CC; 354 idal_buffer_set_cda(idal, ccw); 355 return ccw++; 356} 357 358static inline struct ccw1 * 359tape_ccw_end_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal) 360{ 361 ccw->cmd_code = cmd_code; 362 ccw->flags = 0; 363 idal_buffer_set_cda(idal, ccw); 364 return ccw++; 365} 366 367/* Global vars */ 368extern const char *tape_state_verbose[]; 369extern const char *tape_op_verbose[]; 370 371#endif /* for ifdef tape.h */ 372