dasd_int.h 21 KB

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  1. /*
  2. * File...........: linux/drivers/s390/block/dasd_int.h
  3. * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
  4. * Horst Hummel <Horst.Hummel@de.ibm.com>
  5. * Martin Schwidefsky <schwidefsky@de.ibm.com>
  6. * Bugreports.to..: <Linux390@de.ibm.com>
  7. * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
  8. *
  9. */
  10. #ifndef DASD_INT_H
  11. #define DASD_INT_H
  12. #ifdef __KERNEL__
  13. /* we keep old device allocation scheme; IOW, minors are still in 0..255 */
  14. #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
  15. #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
  16. /*
  17. * States a dasd device can have:
  18. * new: the dasd_device structure is allocated.
  19. * known: the discipline for the device is identified.
  20. * basic: the device can do basic i/o.
  21. * unfmt: the device could not be analyzed (format is unknown).
  22. * ready: partition detection is done and the device is can do block io.
  23. * online: the device accepts requests from the block device queue.
  24. *
  25. * Things to do for startup state transitions:
  26. * new -> known: find discipline for the device and create devfs entries.
  27. * known -> basic: request irq line for the device.
  28. * basic -> ready: do the initial analysis, e.g. format detection,
  29. * do block device setup and detect partitions.
  30. * ready -> online: schedule the device tasklet.
  31. * Things to do for shutdown state transitions:
  32. * online -> ready: just set the new device state.
  33. * ready -> basic: flush requests from the block device layer, clear
  34. * partition information and reset format information.
  35. * basic -> known: terminate all requests and free irq.
  36. * known -> new: remove devfs entries and forget discipline.
  37. */
  38. #define DASD_STATE_NEW 0
  39. #define DASD_STATE_KNOWN 1
  40. #define DASD_STATE_BASIC 2
  41. #define DASD_STATE_UNFMT 3
  42. #define DASD_STATE_READY 4
  43. #define DASD_STATE_ONLINE 5
  44. #include <linux/module.h>
  45. #include <linux/wait.h>
  46. #include <linux/blkdev.h>
  47. #include <linux/genhd.h>
  48. #include <linux/hdreg.h>
  49. #include <linux/interrupt.h>
  50. #include <linux/log2.h>
  51. #include <asm/ccwdev.h>
  52. #include <linux/workqueue.h>
  53. #include <asm/debug.h>
  54. #include <asm/dasd.h>
  55. #include <asm/idals.h>
  56. /*
  57. * SECTION: Type definitions
  58. */
  59. struct dasd_device;
  60. struct dasd_block;
  61. /* BIT DEFINITIONS FOR SENSE DATA */
  62. #define DASD_SENSE_BIT_0 0x80
  63. #define DASD_SENSE_BIT_1 0x40
  64. #define DASD_SENSE_BIT_2 0x20
  65. #define DASD_SENSE_BIT_3 0x10
  66. /* BIT DEFINITIONS FOR SIM SENSE */
  67. #define DASD_SIM_SENSE 0x0F
  68. #define DASD_SIM_MSG_TO_OP 0x03
  69. #define DASD_SIM_LOG 0x0C
  70. /*
  71. * SECTION: MACROs for klogd and s390 debug feature (dbf)
  72. */
  73. #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
  74. do { \
  75. debug_sprintf_event(d_device->debug_area, \
  76. d_level, \
  77. d_str "\n", \
  78. d_data); \
  79. } while(0)
  80. #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
  81. do { \
  82. debug_sprintf_exception(d_device->debug_area, \
  83. d_level, \
  84. d_str "\n", \
  85. d_data); \
  86. } while(0)
  87. #define DBF_EVENT(d_level, d_str, d_data...)\
  88. do { \
  89. debug_sprintf_event(dasd_debug_area, \
  90. d_level,\
  91. d_str "\n", \
  92. d_data); \
  93. } while(0)
  94. #define DBF_EXC(d_level, d_str, d_data...)\
  95. do { \
  96. debug_sprintf_exception(dasd_debug_area, \
  97. d_level,\
  98. d_str "\n", \
  99. d_data); \
  100. } while(0)
  101. /* definition of dbf debug levels */
  102. #define DBF_EMERG 0 /* system is unusable */
  103. #define DBF_ALERT 1 /* action must be taken immediately */
  104. #define DBF_CRIT 2 /* critical conditions */
  105. #define DBF_ERR 3 /* error conditions */
  106. #define DBF_WARNING 4 /* warning conditions */
  107. #define DBF_NOTICE 5 /* normal but significant condition */
  108. #define DBF_INFO 6 /* informational */
  109. #define DBF_DEBUG 6 /* debug-level messages */
  110. /* messages to be written via klogd and dbf */
  111. #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
  112. do { \
  113. printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
  114. dev_name(&d_device->cdev->dev), d_args); \
  115. DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
  116. } while(0)
  117. #define MESSAGE(d_loglevel,d_string,d_args...)\
  118. do { \
  119. printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
  120. DBF_EVENT(DBF_ALERT, d_string, d_args); \
  121. } while(0)
  122. /* messages to be written via klogd only */
  123. #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
  124. do { \
  125. printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
  126. dev_name(&d_device->cdev->dev), d_args); \
  127. } while(0)
  128. #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
  129. do { \
  130. printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
  131. } while(0)
  132. struct dasd_ccw_req {
  133. unsigned int magic; /* Eye catcher */
  134. struct list_head devlist; /* for dasd_device request queue */
  135. struct list_head blocklist; /* for dasd_block request queue */
  136. /* Where to execute what... */
  137. struct dasd_block *block; /* the originating block device */
  138. struct dasd_device *memdev; /* the device used to allocate this */
  139. struct dasd_device *startdev; /* device the request is started on */
  140. void *cpaddr; /* address of ccw or tcw */
  141. unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */
  142. char status; /* status of this request */
  143. short retries; /* A retry counter */
  144. unsigned long flags; /* flags of this request */
  145. /* ... and how */
  146. unsigned long starttime; /* jiffies time of request start */
  147. int expires; /* expiration period in jiffies */
  148. char lpm; /* logical path mask */
  149. void *data; /* pointer to data area */
  150. /* these are important for recovering erroneous requests */
  151. struct irb irb; /* device status in case of an error */
  152. struct dasd_ccw_req *refers; /* ERP-chain queueing. */
  153. void *function; /* originating ERP action */
  154. /* these are for statistics only */
  155. unsigned long long buildclk; /* TOD-clock of request generation */
  156. unsigned long long startclk; /* TOD-clock of request start */
  157. unsigned long long stopclk; /* TOD-clock of request interrupt */
  158. unsigned long long endclk; /* TOD-clock of request termination */
  159. /* Callback that is called after reaching final status. */
  160. void (*callback)(struct dasd_ccw_req *, void *data);
  161. void *callback_data;
  162. };
  163. /*
  164. * dasd_ccw_req -> status can be:
  165. */
  166. #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */
  167. #define DASD_CQR_DONE 0x01 /* request is completed successfully */
  168. #define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */
  169. #define DASD_CQR_IN_ERP 0x03 /* request is in recovery */
  170. #define DASD_CQR_FAILED 0x04 /* request is finally failed */
  171. #define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */
  172. #define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */
  173. #define DASD_CQR_IN_IO 0x81 /* request is currently in IO */
  174. #define DASD_CQR_ERROR 0x82 /* request is completed with error */
  175. #define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */
  176. #define DASD_CQR_CLEARED 0x84 /* request was cleared */
  177. #define DASD_CQR_SUCCESS 0x85 /* request was successful */
  178. /* per dasd_ccw_req flags */
  179. #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
  180. #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
  181. /* Signature for error recovery functions. */
  182. typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
  183. /*
  184. * the struct dasd_discipline is
  185. * sth like a table of virtual functions, if you think of dasd_eckd
  186. * inheriting dasd...
  187. * no, currently we are not planning to reimplement the driver in C++
  188. */
  189. struct dasd_discipline {
  190. struct module *owner;
  191. char ebcname[8]; /* a name used for tagging and printks */
  192. char name[8]; /* a name used for tagging and printks */
  193. int max_blocks; /* maximum number of blocks to be chained */
  194. struct list_head list; /* used for list of disciplines */
  195. /*
  196. * Device recognition functions. check_device is used to verify
  197. * the sense data and the information returned by read device
  198. * characteristics. It returns 0 if the discipline can be used
  199. * for the device in question. uncheck_device is called during
  200. * device shutdown to deregister a device from its discipline.
  201. */
  202. int (*check_device) (struct dasd_device *);
  203. void (*uncheck_device) (struct dasd_device *);
  204. /*
  205. * do_analysis is used in the step from device state "basic" to
  206. * state "accept". It returns 0 if the device can be made ready,
  207. * it returns -EMEDIUMTYPE if the device can't be made ready or
  208. * -EAGAIN if do_analysis started a ccw that needs to complete
  209. * before the analysis may be repeated.
  210. */
  211. int (*do_analysis) (struct dasd_block *);
  212. /*
  213. * Last things to do when a device is set online, and first things
  214. * when it is set offline.
  215. */
  216. int (*ready_to_online) (struct dasd_device *);
  217. int (*online_to_ready) (struct dasd_device *);
  218. /*
  219. * Device operation functions. build_cp creates a ccw chain for
  220. * a block device request, start_io starts the request and
  221. * term_IO cancels it (e.g. in case of a timeout). format_device
  222. * returns a ccw chain to be used to format the device.
  223. * handle_terminated_request allows to examine a cqr and prepare
  224. * it for retry.
  225. */
  226. struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
  227. struct dasd_block *,
  228. struct request *);
  229. int (*start_IO) (struct dasd_ccw_req *);
  230. int (*term_IO) (struct dasd_ccw_req *);
  231. void (*handle_terminated_request) (struct dasd_ccw_req *);
  232. struct dasd_ccw_req *(*format_device) (struct dasd_device *,
  233. struct format_data_t *);
  234. int (*free_cp) (struct dasd_ccw_req *, struct request *);
  235. /*
  236. * Error recovery functions. examine_error() returns a value that
  237. * indicates what to do for an error condition. If examine_error()
  238. * returns 'dasd_era_recover' erp_action() is called to create a
  239. * special error recovery ccw. erp_postaction() is called after
  240. * an error recovery ccw has finished its execution. dump_sense
  241. * is called for every error condition to print the sense data
  242. * to the console.
  243. */
  244. dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
  245. dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
  246. void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
  247. struct irb *);
  248. void (*handle_unsolicited_interrupt) (struct dasd_device *,
  249. struct irb *);
  250. /* i/o control functions. */
  251. int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
  252. int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
  253. int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
  254. };
  255. extern struct dasd_discipline *dasd_diag_discipline_pointer;
  256. /*
  257. * Unique identifier for dasd device.
  258. */
  259. #define UA_NOT_CONFIGURED 0x00
  260. #define UA_BASE_DEVICE 0x01
  261. #define UA_BASE_PAV_ALIAS 0x02
  262. #define UA_HYPER_PAV_ALIAS 0x03
  263. struct dasd_uid {
  264. __u8 type;
  265. char vendor[4];
  266. char serial[15];
  267. __u16 ssid;
  268. __u8 real_unit_addr;
  269. __u8 base_unit_addr;
  270. char vduit[33];
  271. };
  272. /*
  273. * Notification numbers for extended error reporting notifications:
  274. * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
  275. * eer pointer) is freed. The error reporting module needs to do all necessary
  276. * cleanup steps.
  277. * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
  278. */
  279. #define DASD_EER_DISABLE 0
  280. #define DASD_EER_TRIGGER 1
  281. /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
  282. #define DASD_EER_FATALERROR 1
  283. #define DASD_EER_NOPATH 2
  284. #define DASD_EER_STATECHANGE 3
  285. #define DASD_EER_PPRCSUSPEND 4
  286. struct dasd_device {
  287. /* Block device stuff. */
  288. struct dasd_block *block;
  289. unsigned int devindex;
  290. unsigned long flags; /* per device flags */
  291. unsigned short features; /* copy of devmap-features (read-only!) */
  292. /* extended error reporting stuff (eer) */
  293. struct dasd_ccw_req *eer_cqr;
  294. /* Device discipline stuff. */
  295. struct dasd_discipline *discipline;
  296. struct dasd_discipline *base_discipline;
  297. char *private;
  298. /* Device state and target state. */
  299. int state, target;
  300. int stopped; /* device (ccw_device_start) was stopped */
  301. /* reference count. */
  302. atomic_t ref_count;
  303. /* ccw queue and memory for static ccw/erp buffers. */
  304. struct list_head ccw_queue;
  305. spinlock_t mem_lock;
  306. void *ccw_mem;
  307. void *erp_mem;
  308. struct list_head ccw_chunks;
  309. struct list_head erp_chunks;
  310. atomic_t tasklet_scheduled;
  311. struct tasklet_struct tasklet;
  312. struct work_struct kick_work;
  313. struct timer_list timer;
  314. debug_info_t *debug_area;
  315. struct ccw_device *cdev;
  316. /* hook for alias management */
  317. struct list_head alias_list;
  318. };
  319. struct dasd_block {
  320. /* Block device stuff. */
  321. struct gendisk *gdp;
  322. struct request_queue *request_queue;
  323. spinlock_t request_queue_lock;
  324. struct block_device *bdev;
  325. atomic_t open_count;
  326. unsigned long long blocks; /* size of volume in blocks */
  327. unsigned int bp_block; /* bytes per block */
  328. unsigned int s2b_shift; /* log2 (bp_block/512) */
  329. struct dasd_device *base;
  330. struct list_head ccw_queue;
  331. spinlock_t queue_lock;
  332. atomic_t tasklet_scheduled;
  333. struct tasklet_struct tasklet;
  334. struct timer_list timer;
  335. #ifdef CONFIG_DASD_PROFILE
  336. struct dasd_profile_info_t profile;
  337. #endif
  338. };
  339. /* reasons why device (ccw_device_start) was stopped */
  340. #define DASD_STOPPED_NOT_ACC 1 /* not accessible */
  341. #define DASD_STOPPED_QUIESCE 2 /* Quiesced */
  342. #define DASD_STOPPED_PENDING 4 /* long busy */
  343. #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
  344. #define DASD_STOPPED_SU 16 /* summary unit check handling */
  345. /* per device flags */
  346. #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
  347. #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
  348. #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
  349. void dasd_put_device_wake(struct dasd_device *);
  350. /*
  351. * Reference count inliners
  352. */
  353. static inline void
  354. dasd_get_device(struct dasd_device *device)
  355. {
  356. atomic_inc(&device->ref_count);
  357. }
  358. static inline void
  359. dasd_put_device(struct dasd_device *device)
  360. {
  361. if (atomic_dec_return(&device->ref_count) == 0)
  362. dasd_put_device_wake(device);
  363. }
  364. /*
  365. * The static memory in ccw_mem and erp_mem is managed by a sorted
  366. * list of free memory chunks.
  367. */
  368. struct dasd_mchunk
  369. {
  370. struct list_head list;
  371. unsigned long size;
  372. } __attribute__ ((aligned(8)));
  373. static inline void
  374. dasd_init_chunklist(struct list_head *chunk_list, void *mem,
  375. unsigned long size)
  376. {
  377. struct dasd_mchunk *chunk;
  378. INIT_LIST_HEAD(chunk_list);
  379. chunk = (struct dasd_mchunk *) mem;
  380. chunk->size = size - sizeof(struct dasd_mchunk);
  381. list_add(&chunk->list, chunk_list);
  382. }
  383. static inline void *
  384. dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
  385. {
  386. struct dasd_mchunk *chunk, *tmp;
  387. size = (size + 7L) & -8L;
  388. list_for_each_entry(chunk, chunk_list, list) {
  389. if (chunk->size < size)
  390. continue;
  391. if (chunk->size > size + sizeof(struct dasd_mchunk)) {
  392. char *endaddr = (char *) (chunk + 1) + chunk->size;
  393. tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
  394. tmp->size = size;
  395. chunk->size -= size + sizeof(struct dasd_mchunk);
  396. chunk = tmp;
  397. } else
  398. list_del(&chunk->list);
  399. return (void *) (chunk + 1);
  400. }
  401. return NULL;
  402. }
  403. static inline void
  404. dasd_free_chunk(struct list_head *chunk_list, void *mem)
  405. {
  406. struct dasd_mchunk *chunk, *tmp;
  407. struct list_head *p, *left;
  408. chunk = (struct dasd_mchunk *)
  409. ((char *) mem - sizeof(struct dasd_mchunk));
  410. /* Find out the left neighbour in chunk_list. */
  411. left = chunk_list;
  412. list_for_each(p, chunk_list) {
  413. if (list_entry(p, struct dasd_mchunk, list) > chunk)
  414. break;
  415. left = p;
  416. }
  417. /* Try to merge with right neighbour = next element from left. */
  418. if (left->next != chunk_list) {
  419. tmp = list_entry(left->next, struct dasd_mchunk, list);
  420. if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
  421. list_del(&tmp->list);
  422. chunk->size += tmp->size + sizeof(struct dasd_mchunk);
  423. }
  424. }
  425. /* Try to merge with left neighbour. */
  426. if (left != chunk_list) {
  427. tmp = list_entry(left, struct dasd_mchunk, list);
  428. if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
  429. tmp->size += chunk->size + sizeof(struct dasd_mchunk);
  430. return;
  431. }
  432. }
  433. __list_add(&chunk->list, left, left->next);
  434. }
  435. /*
  436. * Check if bsize is in { 512, 1024, 2048, 4096 }
  437. */
  438. static inline int
  439. dasd_check_blocksize(int bsize)
  440. {
  441. if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
  442. return -EMEDIUMTYPE;
  443. return 0;
  444. }
  445. /* externals in dasd.c */
  446. #define DASD_PROFILE_ON 1
  447. #define DASD_PROFILE_OFF 0
  448. extern debug_info_t *dasd_debug_area;
  449. extern struct dasd_profile_info_t dasd_global_profile;
  450. extern unsigned int dasd_profile_level;
  451. extern struct block_device_operations dasd_device_operations;
  452. extern struct kmem_cache *dasd_page_cache;
  453. struct dasd_ccw_req *
  454. dasd_kmalloc_request(char *, int, int, struct dasd_device *);
  455. struct dasd_ccw_req *
  456. dasd_smalloc_request(char *, int, int, struct dasd_device *);
  457. void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
  458. void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
  459. static inline int
  460. dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
  461. {
  462. return set_normalized_cda(ccw, cda);
  463. }
  464. struct dasd_device *dasd_alloc_device(void);
  465. void dasd_free_device(struct dasd_device *);
  466. struct dasd_block *dasd_alloc_block(void);
  467. void dasd_free_block(struct dasd_block *);
  468. void dasd_enable_device(struct dasd_device *);
  469. void dasd_set_target_state(struct dasd_device *, int);
  470. void dasd_kick_device(struct dasd_device *);
  471. void dasd_add_request_head(struct dasd_ccw_req *);
  472. void dasd_add_request_tail(struct dasd_ccw_req *);
  473. int dasd_start_IO(struct dasd_ccw_req *);
  474. int dasd_term_IO(struct dasd_ccw_req *);
  475. void dasd_schedule_device_bh(struct dasd_device *);
  476. void dasd_schedule_block_bh(struct dasd_block *);
  477. int dasd_sleep_on(struct dasd_ccw_req *);
  478. int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
  479. int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
  480. void dasd_device_set_timer(struct dasd_device *, int);
  481. void dasd_device_clear_timer(struct dasd_device *);
  482. void dasd_block_set_timer(struct dasd_block *, int);
  483. void dasd_block_clear_timer(struct dasd_block *);
  484. int dasd_cancel_req(struct dasd_ccw_req *);
  485. int dasd_flush_device_queue(struct dasd_device *);
  486. int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
  487. void dasd_generic_remove (struct ccw_device *cdev);
  488. int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
  489. int dasd_generic_set_offline (struct ccw_device *cdev);
  490. int dasd_generic_notify(struct ccw_device *, int);
  491. void dasd_generic_handle_state_change(struct dasd_device *);
  492. int dasd_generic_read_dev_chars(struct dasd_device *, char *, void **, int);
  493. char *dasd_get_sense(struct irb *);
  494. /* externals in dasd_devmap.c */
  495. extern int dasd_max_devindex;
  496. extern int dasd_probeonly;
  497. extern int dasd_autodetect;
  498. extern int dasd_nopav;
  499. extern int dasd_nofcx;
  500. int dasd_devmap_init(void);
  501. void dasd_devmap_exit(void);
  502. struct dasd_device *dasd_create_device(struct ccw_device *);
  503. void dasd_delete_device(struct dasd_device *);
  504. int dasd_get_uid(struct ccw_device *, struct dasd_uid *);
  505. int dasd_set_uid(struct ccw_device *, struct dasd_uid *);
  506. int dasd_get_feature(struct ccw_device *, int);
  507. int dasd_set_feature(struct ccw_device *, int, int);
  508. int dasd_add_sysfs_files(struct ccw_device *);
  509. void dasd_remove_sysfs_files(struct ccw_device *);
  510. struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
  511. struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
  512. struct dasd_device *dasd_device_from_devindex(int);
  513. int dasd_parse(void);
  514. int dasd_busid_known(const char *);
  515. /* externals in dasd_gendisk.c */
  516. int dasd_gendisk_init(void);
  517. void dasd_gendisk_exit(void);
  518. int dasd_gendisk_alloc(struct dasd_block *);
  519. void dasd_gendisk_free(struct dasd_block *);
  520. int dasd_scan_partitions(struct dasd_block *);
  521. void dasd_destroy_partitions(struct dasd_block *);
  522. /* externals in dasd_ioctl.c */
  523. int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
  524. /* externals in dasd_proc.c */
  525. int dasd_proc_init(void);
  526. void dasd_proc_exit(void);
  527. /* externals in dasd_erp.c */
  528. struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
  529. struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
  530. struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
  531. struct dasd_device *);
  532. void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
  533. void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
  534. /* externals in dasd_3990_erp.c */
  535. struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
  536. void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
  537. /* externals in dasd_eer.c */
  538. #ifdef CONFIG_DASD_EER
  539. int dasd_eer_init(void);
  540. void dasd_eer_exit(void);
  541. int dasd_eer_enable(struct dasd_device *);
  542. void dasd_eer_disable(struct dasd_device *);
  543. void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
  544. unsigned int id);
  545. void dasd_eer_snss(struct dasd_device *);
  546. static inline int dasd_eer_enabled(struct dasd_device *device)
  547. {
  548. return device->eer_cqr != NULL;
  549. }
  550. #else
  551. #define dasd_eer_init() (0)
  552. #define dasd_eer_exit() do { } while (0)
  553. #define dasd_eer_enable(d) (0)
  554. #define dasd_eer_disable(d) do { } while (0)
  555. #define dasd_eer_write(d,c,i) do { } while (0)
  556. #define dasd_eer_snss(d) do { } while (0)
  557. #define dasd_eer_enabled(d) (0)
  558. #endif /* CONFIG_DASD_ERR */
  559. #endif /* __KERNEL__ */
  560. #endif /* DASD_H */