dasd_diag.c 17 KB

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  1. /*
  2. * File...........: linux/drivers/s390/block/dasd_diag.c
  3. * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
  4. * Based on.......: linux/drivers/s390/block/mdisk.c
  5. * ...............: by Hartmunt Penner <hpenner@de.ibm.com>
  6. * Bugreports.to..: <Linux390@de.ibm.com>
  7. * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
  8. *
  9. */
  10. #include <linux/stddef.h>
  11. #include <linux/kernel.h>
  12. #include <linux/slab.h>
  13. #include <linux/hdreg.h>
  14. #include <linux/bio.h>
  15. #include <linux/module.h>
  16. #include <linux/init.h>
  17. #include <linux/jiffies.h>
  18. #include <asm/dasd.h>
  19. #include <asm/debug.h>
  20. #include <asm/ebcdic.h>
  21. #include <asm/io.h>
  22. #include <asm/s390_ext.h>
  23. #include <asm/todclk.h>
  24. #include <asm/vtoc.h>
  25. #include <asm/diag.h>
  26. #include "dasd_int.h"
  27. #include "dasd_diag.h"
  28. #define PRINTK_HEADER "dasd(diag):"
  29. MODULE_LICENSE("GPL");
  30. /* The maximum number of blocks per request (max_blocks) is dependent on the
  31. * amount of storage that is available in the static I/O buffer for each
  32. * device. Currently each device gets 2 pages. We want to fit two requests
  33. * into the available memory so that we can immediately start the next if one
  34. * finishes. */
  35. #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \
  36. sizeof(struct dasd_diag_req)) / \
  37. sizeof(struct dasd_diag_bio)) / 2)
  38. #define DIAG_MAX_RETRIES 32
  39. #define DIAG_TIMEOUT 50 * HZ
  40. static struct dasd_discipline dasd_diag_discipline;
  41. struct dasd_diag_private {
  42. struct dasd_diag_characteristics rdc_data;
  43. struct dasd_diag_rw_io iob;
  44. struct dasd_diag_init_io iib;
  45. blocknum_t pt_block;
  46. struct ccw_dev_id dev_id;
  47. };
  48. struct dasd_diag_req {
  49. unsigned int block_count;
  50. struct dasd_diag_bio bio[0];
  51. };
  52. static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
  53. /* Perform DIAG250 call with block I/O parameter list iob (input and output)
  54. * and function code cmd.
  55. * In case of an exception return 3. Otherwise return result of bitwise OR of
  56. * resulting condition code and DIAG return code. */
  57. static inline int dia250(void *iob, int cmd)
  58. {
  59. register unsigned long reg2 asm ("2") = (unsigned long) iob;
  60. typedef union {
  61. struct dasd_diag_init_io init_io;
  62. struct dasd_diag_rw_io rw_io;
  63. } addr_type;
  64. int rc;
  65. rc = 3;
  66. asm volatile(
  67. " diag 2,%2,0x250\n"
  68. "0: ipm %0\n"
  69. " srl %0,28\n"
  70. " or %0,3\n"
  71. "1:\n"
  72. EX_TABLE(0b,1b)
  73. : "+d" (rc), "=m" (*(addr_type *) iob)
  74. : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob)
  75. : "3", "cc");
  76. return rc;
  77. }
  78. /* Initialize block I/O to DIAG device using the specified blocksize and
  79. * block offset. On success, return zero and set end_block to contain the
  80. * number of blocks on the device minus the specified offset. Return non-zero
  81. * otherwise. */
  82. static inline int
  83. mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
  84. blocknum_t offset, blocknum_t *end_block)
  85. {
  86. struct dasd_diag_private *private;
  87. struct dasd_diag_init_io *iib;
  88. int rc;
  89. private = (struct dasd_diag_private *) device->private;
  90. iib = &private->iib;
  91. memset(iib, 0, sizeof (struct dasd_diag_init_io));
  92. iib->dev_nr = private->dev_id.devno;
  93. iib->block_size = blocksize;
  94. iib->offset = offset;
  95. iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
  96. rc = dia250(iib, INIT_BIO);
  97. if ((rc & 3) == 0 && end_block)
  98. *end_block = iib->end_block;
  99. return rc;
  100. }
  101. /* Remove block I/O environment for device. Return zero on success, non-zero
  102. * otherwise. */
  103. static inline int
  104. mdsk_term_io(struct dasd_device * device)
  105. {
  106. struct dasd_diag_private *private;
  107. struct dasd_diag_init_io *iib;
  108. int rc;
  109. private = (struct dasd_diag_private *) device->private;
  110. iib = &private->iib;
  111. memset(iib, 0, sizeof (struct dasd_diag_init_io));
  112. iib->dev_nr = private->dev_id.devno;
  113. rc = dia250(iib, TERM_BIO);
  114. return rc;
  115. }
  116. /* Error recovery for failed DIAG requests - try to reestablish the DIAG
  117. * environment. */
  118. static void
  119. dasd_diag_erp(struct dasd_device *device)
  120. {
  121. int rc;
  122. mdsk_term_io(device);
  123. rc = mdsk_init_io(device, device->bp_block, 0, NULL);
  124. if (rc)
  125. DEV_MESSAGE(KERN_WARNING, device, "DIAG ERP unsuccessful, "
  126. "rc=%d", rc);
  127. }
  128. /* Start a given request at the device. Return zero on success, non-zero
  129. * otherwise. */
  130. static int
  131. dasd_start_diag(struct dasd_ccw_req * cqr)
  132. {
  133. struct dasd_device *device;
  134. struct dasd_diag_private *private;
  135. struct dasd_diag_req *dreq;
  136. int rc;
  137. device = cqr->device;
  138. if (cqr->retries < 0) {
  139. DEV_MESSAGE(KERN_WARNING, device, "DIAG start_IO: request %p "
  140. "- no retry left)", cqr);
  141. cqr->status = DASD_CQR_FAILED;
  142. return -EIO;
  143. }
  144. private = (struct dasd_diag_private *) device->private;
  145. dreq = (struct dasd_diag_req *) cqr->data;
  146. private->iob.dev_nr = private->dev_id.devno;
  147. private->iob.key = 0;
  148. private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
  149. private->iob.block_count = dreq->block_count;
  150. private->iob.interrupt_params = (addr_t) cqr;
  151. private->iob.bio_list = dreq->bio;
  152. private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
  153. cqr->startclk = get_clock();
  154. cqr->starttime = jiffies;
  155. cqr->retries--;
  156. rc = dia250(&private->iob, RW_BIO);
  157. switch (rc) {
  158. case 0: /* Synchronous I/O finished successfully */
  159. cqr->stopclk = get_clock();
  160. cqr->status = DASD_CQR_DONE;
  161. /* Indicate to calling function that only a dasd_schedule_bh()
  162. and no timer is needed */
  163. rc = -EACCES;
  164. break;
  165. case 8: /* Asynchronous I/O was started */
  166. cqr->status = DASD_CQR_IN_IO;
  167. rc = 0;
  168. break;
  169. default: /* Error condition */
  170. cqr->status = DASD_CQR_QUEUED;
  171. DEV_MESSAGE(KERN_WARNING, device, "dia250 returned rc=%d", rc);
  172. dasd_diag_erp(device);
  173. rc = -EIO;
  174. break;
  175. }
  176. return rc;
  177. }
  178. /* Terminate given request at the device. */
  179. static int
  180. dasd_diag_term_IO(struct dasd_ccw_req * cqr)
  181. {
  182. struct dasd_device *device;
  183. device = cqr->device;
  184. mdsk_term_io(device);
  185. mdsk_init_io(device, device->bp_block, 0, NULL);
  186. cqr->status = DASD_CQR_CLEAR;
  187. cqr->stopclk = get_clock();
  188. dasd_schedule_bh(device);
  189. return 0;
  190. }
  191. /* Handle external interruption. */
  192. static void
  193. dasd_ext_handler(__u16 code)
  194. {
  195. struct dasd_ccw_req *cqr, *next;
  196. struct dasd_device *device;
  197. unsigned long long expires;
  198. unsigned long flags;
  199. u8 int_code, status;
  200. addr_t ip;
  201. int rc;
  202. int_code = *((u8 *) DASD_DIAG_LC_INT_CODE);
  203. status = *((u8 *) DASD_DIAG_LC_INT_STATUS);
  204. switch (int_code) {
  205. case DASD_DIAG_CODE_31BIT:
  206. ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT);
  207. break;
  208. case DASD_DIAG_CODE_64BIT:
  209. ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT);
  210. break;
  211. default:
  212. return;
  213. }
  214. if (!ip) { /* no intparm: unsolicited interrupt */
  215. MESSAGE(KERN_DEBUG, "%s", "caught unsolicited interrupt");
  216. return;
  217. }
  218. cqr = (struct dasd_ccw_req *) ip;
  219. device = (struct dasd_device *) cqr->device;
  220. if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
  221. DEV_MESSAGE(KERN_WARNING, device,
  222. " magic number of dasd_ccw_req 0x%08X doesn't"
  223. " match discipline 0x%08X",
  224. cqr->magic, *(int *) (&device->discipline->name));
  225. return;
  226. }
  227. /* get irq lock to modify request queue */
  228. spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
  229. /* Check for a pending clear operation */
  230. if (cqr->status == DASD_CQR_CLEAR) {
  231. cqr->status = DASD_CQR_QUEUED;
  232. dasd_clear_timer(device);
  233. dasd_schedule_bh(device);
  234. spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
  235. return;
  236. }
  237. cqr->stopclk = get_clock();
  238. expires = 0;
  239. if (status == 0) {
  240. cqr->status = DASD_CQR_DONE;
  241. /* Start first request on queue if possible -> fast_io. */
  242. if (!list_empty(&device->ccw_queue)) {
  243. next = list_entry(device->ccw_queue.next,
  244. struct dasd_ccw_req, list);
  245. if (next->status == DASD_CQR_QUEUED) {
  246. rc = dasd_start_diag(next);
  247. if (rc == 0)
  248. expires = next->expires;
  249. else if (rc != -EACCES)
  250. DEV_MESSAGE(KERN_WARNING, device, "%s",
  251. "Interrupt fastpath "
  252. "failed!");
  253. }
  254. }
  255. } else {
  256. cqr->status = DASD_CQR_QUEUED;
  257. DEV_MESSAGE(KERN_WARNING, device, "interrupt status for "
  258. "request %p was %d (%d retries left)", cqr, status,
  259. cqr->retries);
  260. dasd_diag_erp(device);
  261. }
  262. if (expires != 0)
  263. dasd_set_timer(device, expires);
  264. else
  265. dasd_clear_timer(device);
  266. dasd_schedule_bh(device);
  267. spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
  268. }
  269. /* Check whether device can be controlled by DIAG discipline. Return zero on
  270. * success, non-zero otherwise. */
  271. static int
  272. dasd_diag_check_device(struct dasd_device *device)
  273. {
  274. struct dasd_diag_private *private;
  275. struct dasd_diag_characteristics *rdc_data;
  276. struct dasd_diag_bio bio;
  277. struct vtoc_cms_label *label;
  278. blocknum_t end_block;
  279. unsigned int sb, bsize;
  280. int rc;
  281. private = (struct dasd_diag_private *) device->private;
  282. if (private == NULL) {
  283. private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL);
  284. if (private == NULL) {
  285. DEV_MESSAGE(KERN_WARNING, device, "%s",
  286. "memory allocation failed for private data");
  287. return -ENOMEM;
  288. }
  289. ccw_device_get_id(device->cdev, &private->dev_id);
  290. device->private = (void *) private;
  291. }
  292. /* Read Device Characteristics */
  293. rdc_data = (void *) &(private->rdc_data);
  294. rdc_data->dev_nr = private->dev_id.devno;
  295. rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
  296. rc = diag210((struct diag210 *) rdc_data);
  297. if (rc) {
  298. DEV_MESSAGE(KERN_WARNING, device, "failed to retrieve device "
  299. "information (rc=%d)", rc);
  300. return -ENOTSUPP;
  301. }
  302. /* Figure out position of label block */
  303. switch (private->rdc_data.vdev_class) {
  304. case DEV_CLASS_FBA:
  305. private->pt_block = 1;
  306. break;
  307. case DEV_CLASS_ECKD:
  308. private->pt_block = 2;
  309. break;
  310. default:
  311. DEV_MESSAGE(KERN_WARNING, device, "unsupported device class "
  312. "(class=%d)", private->rdc_data.vdev_class);
  313. return -ENOTSUPP;
  314. }
  315. DBF_DEV_EVENT(DBF_INFO, device,
  316. "%04X: %04X on real %04X/%02X",
  317. rdc_data->dev_nr,
  318. rdc_data->vdev_type,
  319. rdc_data->rdev_type, rdc_data->rdev_model);
  320. /* terminate all outstanding operations */
  321. mdsk_term_io(device);
  322. /* figure out blocksize of device */
  323. label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL);
  324. if (label == NULL) {
  325. DEV_MESSAGE(KERN_WARNING, device, "%s",
  326. "No memory to allocate initialization request");
  327. return -ENOMEM;
  328. }
  329. rc = 0;
  330. end_block = 0;
  331. /* try all sizes - needed for ECKD devices */
  332. for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
  333. mdsk_init_io(device, bsize, 0, &end_block);
  334. memset(&bio, 0, sizeof (struct dasd_diag_bio));
  335. bio.type = MDSK_READ_REQ;
  336. bio.block_number = private->pt_block + 1;
  337. bio.buffer = label;
  338. memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io));
  339. private->iob.dev_nr = rdc_data->dev_nr;
  340. private->iob.key = 0;
  341. private->iob.flags = 0; /* do synchronous io */
  342. private->iob.block_count = 1;
  343. private->iob.interrupt_params = 0;
  344. private->iob.bio_list = &bio;
  345. private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
  346. rc = dia250(&private->iob, RW_BIO);
  347. if (rc == 3) {
  348. DEV_MESSAGE(KERN_WARNING, device, "%s",
  349. "DIAG call failed");
  350. rc = -EOPNOTSUPP;
  351. goto out;
  352. }
  353. mdsk_term_io(device);
  354. if (rc == 0)
  355. break;
  356. }
  357. if (bsize > PAGE_SIZE) {
  358. DEV_MESSAGE(KERN_WARNING, device, "device access failed "
  359. "(rc=%d)", rc);
  360. rc = -EIO;
  361. goto out;
  362. }
  363. /* check for label block */
  364. if (memcmp(label->label_id, DASD_DIAG_CMS1,
  365. sizeof(DASD_DIAG_CMS1)) == 0) {
  366. /* get formatted blocksize from label block */
  367. bsize = (unsigned int) label->block_size;
  368. device->blocks = (unsigned long) label->block_count;
  369. } else
  370. device->blocks = end_block;
  371. device->bp_block = bsize;
  372. device->s2b_shift = 0; /* bits to shift 512 to get a block */
  373. for (sb = 512; sb < bsize; sb = sb << 1)
  374. device->s2b_shift++;
  375. rc = mdsk_init_io(device, device->bp_block, 0, NULL);
  376. if (rc) {
  377. DEV_MESSAGE(KERN_WARNING, device, "DIAG initialization "
  378. "failed (rc=%d)", rc);
  379. rc = -EIO;
  380. } else {
  381. DEV_MESSAGE(KERN_INFO, device,
  382. "(%ld B/blk): %ldkB",
  383. (unsigned long) device->bp_block,
  384. (unsigned long) (device->blocks <<
  385. device->s2b_shift) >> 1);
  386. }
  387. out:
  388. free_page((long) label);
  389. return rc;
  390. }
  391. /* Fill in virtual disk geometry for device. Return zero on success, non-zero
  392. * otherwise. */
  393. static int
  394. dasd_diag_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
  395. {
  396. if (dasd_check_blocksize(device->bp_block) != 0)
  397. return -EINVAL;
  398. geo->cylinders = (device->blocks << device->s2b_shift) >> 10;
  399. geo->heads = 16;
  400. geo->sectors = 128 >> device->s2b_shift;
  401. return 0;
  402. }
  403. static dasd_era_t
  404. dasd_diag_examine_error(struct dasd_ccw_req * cqr, struct irb * stat)
  405. {
  406. return dasd_era_fatal;
  407. }
  408. static dasd_erp_fn_t
  409. dasd_diag_erp_action(struct dasd_ccw_req * cqr)
  410. {
  411. return dasd_default_erp_action;
  412. }
  413. static dasd_erp_fn_t
  414. dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
  415. {
  416. return dasd_default_erp_postaction;
  417. }
  418. /* Create DASD request from block device request. Return pointer to new
  419. * request on success, ERR_PTR otherwise. */
  420. static struct dasd_ccw_req *
  421. dasd_diag_build_cp(struct dasd_device * device, struct request *req)
  422. {
  423. struct dasd_ccw_req *cqr;
  424. struct dasd_diag_req *dreq;
  425. struct dasd_diag_bio *dbio;
  426. struct req_iterator iter;
  427. struct bio_vec *bv;
  428. char *dst;
  429. unsigned int count, datasize;
  430. sector_t recid, first_rec, last_rec;
  431. unsigned int blksize, off;
  432. unsigned char rw_cmd;
  433. if (rq_data_dir(req) == READ)
  434. rw_cmd = MDSK_READ_REQ;
  435. else if (rq_data_dir(req) == WRITE)
  436. rw_cmd = MDSK_WRITE_REQ;
  437. else
  438. return ERR_PTR(-EINVAL);
  439. blksize = device->bp_block;
  440. /* Calculate record id of first and last block. */
  441. first_rec = req->sector >> device->s2b_shift;
  442. last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
  443. /* Check struct bio and count the number of blocks for the request. */
  444. count = 0;
  445. rq_for_each_segment(bv, req, iter) {
  446. if (bv->bv_len & (blksize - 1))
  447. /* Fba can only do full blocks. */
  448. return ERR_PTR(-EINVAL);
  449. count += bv->bv_len >> (device->s2b_shift + 9);
  450. }
  451. /* Paranoia. */
  452. if (count != last_rec - first_rec + 1)
  453. return ERR_PTR(-EINVAL);
  454. /* Build the request */
  455. datasize = sizeof(struct dasd_diag_req) +
  456. count*sizeof(struct dasd_diag_bio);
  457. cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0,
  458. datasize, device);
  459. if (IS_ERR(cqr))
  460. return cqr;
  461. dreq = (struct dasd_diag_req *) cqr->data;
  462. dreq->block_count = count;
  463. dbio = dreq->bio;
  464. recid = first_rec;
  465. rq_for_each_segment(bv, req, iter) {
  466. dst = page_address(bv->bv_page) + bv->bv_offset;
  467. for (off = 0; off < bv->bv_len; off += blksize) {
  468. memset(dbio, 0, sizeof (struct dasd_diag_bio));
  469. dbio->type = rw_cmd;
  470. dbio->block_number = recid + 1;
  471. dbio->buffer = dst;
  472. dbio++;
  473. dst += blksize;
  474. recid++;
  475. }
  476. }
  477. cqr->retries = DIAG_MAX_RETRIES;
  478. cqr->buildclk = get_clock();
  479. if (req->cmd_flags & REQ_FAILFAST)
  480. set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
  481. cqr->device = device;
  482. cqr->expires = DIAG_TIMEOUT;
  483. cqr->status = DASD_CQR_FILLED;
  484. return cqr;
  485. }
  486. /* Release DASD request. Return non-zero if request was successful, zero
  487. * otherwise. */
  488. static int
  489. dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
  490. {
  491. int status;
  492. status = cqr->status == DASD_CQR_DONE;
  493. dasd_sfree_request(cqr, cqr->device);
  494. return status;
  495. }
  496. /* Fill in IOCTL data for device. */
  497. static int
  498. dasd_diag_fill_info(struct dasd_device * device,
  499. struct dasd_information2_t * info)
  500. {
  501. struct dasd_diag_private *private;
  502. private = (struct dasd_diag_private *) device->private;
  503. info->label_block = (unsigned int) private->pt_block;
  504. info->FBA_layout = 1;
  505. info->format = DASD_FORMAT_LDL;
  506. info->characteristics_size = sizeof (struct dasd_diag_characteristics);
  507. memcpy(info->characteristics,
  508. &((struct dasd_diag_private *) device->private)->rdc_data,
  509. sizeof (struct dasd_diag_characteristics));
  510. info->confdata_size = 0;
  511. return 0;
  512. }
  513. static void
  514. dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
  515. struct irb *stat)
  516. {
  517. DEV_MESSAGE(KERN_ERR, device, "%s",
  518. "dump sense not available for DIAG data");
  519. }
  520. static struct dasd_discipline dasd_diag_discipline = {
  521. .owner = THIS_MODULE,
  522. .name = "DIAG",
  523. .ebcname = "DIAG",
  524. .max_blocks = DIAG_MAX_BLOCKS,
  525. .check_device = dasd_diag_check_device,
  526. .fill_geometry = dasd_diag_fill_geometry,
  527. .start_IO = dasd_start_diag,
  528. .term_IO = dasd_diag_term_IO,
  529. .examine_error = dasd_diag_examine_error,
  530. .erp_action = dasd_diag_erp_action,
  531. .erp_postaction = dasd_diag_erp_postaction,
  532. .build_cp = dasd_diag_build_cp,
  533. .free_cp = dasd_diag_free_cp,
  534. .dump_sense = dasd_diag_dump_sense,
  535. .fill_info = dasd_diag_fill_info,
  536. };
  537. static int __init
  538. dasd_diag_init(void)
  539. {
  540. if (!MACHINE_IS_VM) {
  541. MESSAGE_LOG(KERN_INFO,
  542. "Machine is not VM: %s "
  543. "discipline not initializing",
  544. dasd_diag_discipline.name);
  545. return -ENODEV;
  546. }
  547. ASCEBC(dasd_diag_discipline.ebcname, 4);
  548. ctl_set_bit(0, 9);
  549. register_external_interrupt(0x2603, dasd_ext_handler);
  550. dasd_diag_discipline_pointer = &dasd_diag_discipline;
  551. return 0;
  552. }
  553. static void __exit
  554. dasd_diag_cleanup(void)
  555. {
  556. unregister_external_interrupt(0x2603, dasd_ext_handler);
  557. ctl_clear_bit(0, 9);
  558. dasd_diag_discipline_pointer = NULL;
  559. }
  560. module_init(dasd_diag_init);
  561. module_exit(dasd_diag_cleanup);