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dasd_eckd.c
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1 /*
2  * Author(s)......: Holger Smolinski <[email protected]>
3  * Horst Hummel <[email protected]>
4  * Carsten Otte <[email protected]>
5  * Martin Schwidefsky <[email protected]>
6  * Bugreports.to..: <[email protected]>
7  * Copyright IBM Corp. 1999, 2009
8  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
9  * Author.........: Nigel Hislop <[email protected]>
10  */
11 
12 #define KMSG_COMPONENT "dasd-eckd"
13 
14 #include <linux/stddef.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/hdreg.h> /* HDIO_GETGEO */
18 #include <linux/bio.h>
19 #include <linux/module.h>
20 #include <linux/compat.h>
21 #include <linux/init.h>
22 
23 #include <asm/css_chars.h>
24 #include <asm/debug.h>
25 #include <asm/idals.h>
26 #include <asm/ebcdic.h>
27 #include <asm/io.h>
28 #include <asm/uaccess.h>
29 #include <asm/cio.h>
30 #include <asm/ccwdev.h>
31 #include <asm/itcw.h>
32 
33 #include "dasd_int.h"
34 #include "dasd_eckd.h"
35 
36 #ifdef PRINTK_HEADER
37 #undef PRINTK_HEADER
38 #endif /* PRINTK_HEADER */
39 #define PRINTK_HEADER "dasd(eckd):"
40 
41 #define ECKD_C0(i) (i->home_bytes)
42 #define ECKD_F(i) (i->formula)
43 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
44  (i->factors.f_0x02.f1))
45 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
46  (i->factors.f_0x02.f2))
47 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
48  (i->factors.f_0x02.f3))
49 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
50 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
51 #define ECKD_F6(i) (i->factor6)
52 #define ECKD_F7(i) (i->factor7)
53 #define ECKD_F8(i) (i->factor8)
54 
55 /*
56  * raw track access always map to 64k in memory
57  * so it maps to 16 blocks of 4k per track
58  */
59 #define DASD_RAW_BLOCK_PER_TRACK 16
60 #define DASD_RAW_BLOCKSIZE 4096
61 /* 64k are 128 x 512 byte sectors */
62 #define DASD_RAW_SECTORS_PER_TRACK 128
63 
64 MODULE_LICENSE("GPL");
65 
66 static struct dasd_discipline dasd_eckd_discipline;
67 
68 /* The ccw bus type uses this table to find devices that it sends to
69  * dasd_eckd_probe */
70 static struct ccw_device_id dasd_eckd_ids[] = {
71  { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
72  { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
73  { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
74  { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
75  { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
76  { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
77  { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
78  { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
79  { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
80  { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
81  { /* end of list */ },
82 };
83 
84 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
85 
86 static struct ccw_driver dasd_eckd_driver; /* see below */
87 
88 #define INIT_CQR_OK 0
89 #define INIT_CQR_UNFORMATTED 1
90 #define INIT_CQR_ERROR 2
91 
92 /* emergency request for reserve/release */
93 static struct {
94  struct dasd_ccw_req cqr;
95  struct ccw1 ccw;
96  char data[32];
97 } *dasd_reserve_req;
98 static DEFINE_MUTEX(dasd_reserve_mutex);
99 
100 /* definitions for the path verification worker */
101 struct path_verification_work_data {
102  struct work_struct worker;
103  struct dasd_device *device;
104  struct dasd_ccw_req cqr;
105  struct ccw1 ccw;
106  __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
107  int isglobal;
108  __u8 tbvpm;
109 };
110 static struct path_verification_work_data *path_verification_worker;
111 static DEFINE_MUTEX(dasd_path_verification_mutex);
112 
113 /* initial attempt at a probe function. this can be simplified once
114  * the other detection code is gone */
115 static int
116 dasd_eckd_probe (struct ccw_device *cdev)
117 {
118  int ret;
119 
120  /* set ECKD specific ccw-device options */
121  ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
122  CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
123  if (ret) {
124  DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
125  "dasd_eckd_probe: could not set "
126  "ccw-device options");
127  return ret;
128  }
129  ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
130  return ret;
131 }
132 
133 static int
134 dasd_eckd_set_online(struct ccw_device *cdev)
135 {
136  return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
137 }
138 
139 static const int sizes_trk0[] = { 28, 148, 84 };
140 #define LABEL_SIZE 140
141 
142 /* head and record addresses of count_area read in analysis ccw */
143 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
144 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
145 
146 static inline unsigned int
147 round_up_multiple(unsigned int no, unsigned int mult)
148 {
149  int rem = no % mult;
150  return (rem ? no - rem + mult : no);
151 }
152 
153 static inline unsigned int
154 ceil_quot(unsigned int d1, unsigned int d2)
155 {
156  return (d1 + (d2 - 1)) / d2;
157 }
158 
159 static unsigned int
160 recs_per_track(struct dasd_eckd_characteristics * rdc,
161  unsigned int kl, unsigned int dl)
162 {
163  int dn, kn;
164 
165  switch (rdc->dev_type) {
166  case 0x3380:
167  if (kl)
168  return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
169  ceil_quot(dl + 12, 32));
170  else
171  return 1499 / (15 + ceil_quot(dl + 12, 32));
172  case 0x3390:
173  dn = ceil_quot(dl + 6, 232) + 1;
174  if (kl) {
175  kn = ceil_quot(kl + 6, 232) + 1;
176  return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
177  9 + ceil_quot(dl + 6 * dn, 34));
178  } else
179  return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
180  case 0x9345:
181  dn = ceil_quot(dl + 6, 232) + 1;
182  if (kl) {
183  kn = ceil_quot(kl + 6, 232) + 1;
184  return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
185  ceil_quot(dl + 6 * dn, 34));
186  } else
187  return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
188  }
189  return 0;
190 }
191 
192 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
193 {
194  geo->cyl = (__u16) cyl;
195  geo->head = cyl >> 16;
196  geo->head <<= 4;
197  geo->head |= head;
198 }
199 
200 static int
201 check_XRC (struct ccw1 *de_ccw,
202  struct DE_eckd_data *data,
203  struct dasd_device *device)
204 {
205  struct dasd_eckd_private *private;
206  int rc;
207 
208  private = (struct dasd_eckd_private *) device->private;
209  if (!private->rdc_data.facilities.XRC_supported)
210  return 0;
211 
212  /* switch on System Time Stamp - needed for XRC Support */
213  data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
214  data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
215 
216  rc = get_sync_clock(&data->ep_sys_time);
217  /* Ignore return code if sync clock is switched off. */
218  if (rc == -EOPNOTSUPP || rc == -EACCES)
219  rc = 0;
220 
221  de_ccw->count = sizeof(struct DE_eckd_data);
222  de_ccw->flags |= CCW_FLAG_SLI;
223  return rc;
224 }
225 
226 static int
227 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
228  unsigned int totrk, int cmd, struct dasd_device *device)
229 {
230  struct dasd_eckd_private *private;
231  u32 begcyl, endcyl;
232  u16 heads, beghead, endhead;
233  int rc = 0;
234 
235  private = (struct dasd_eckd_private *) device->private;
236 
237  ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
238  ccw->flags = 0;
239  ccw->count = 16;
240  ccw->cda = (__u32) __pa(data);
241 
242  memset(data, 0, sizeof(struct DE_eckd_data));
243  switch (cmd) {
244  case DASD_ECKD_CCW_READ_HOME_ADDRESS:
245  case DASD_ECKD_CCW_READ_RECORD_ZERO:
246  case DASD_ECKD_CCW_READ:
247  case DASD_ECKD_CCW_READ_MT:
248  case DASD_ECKD_CCW_READ_CKD:
249  case DASD_ECKD_CCW_READ_CKD_MT:
250  case DASD_ECKD_CCW_READ_KD:
251  case DASD_ECKD_CCW_READ_KD_MT:
252  case DASD_ECKD_CCW_READ_COUNT:
253  data->mask.perm = 0x1;
254  data->attributes.operation = private->attrib.operation;
255  break;
256  case DASD_ECKD_CCW_WRITE:
257  case DASD_ECKD_CCW_WRITE_MT:
258  case DASD_ECKD_CCW_WRITE_KD:
259  case DASD_ECKD_CCW_WRITE_KD_MT:
260  data->mask.perm = 0x02;
261  data->attributes.operation = private->attrib.operation;
262  rc = check_XRC (ccw, data, device);
263  break;
264  case DASD_ECKD_CCW_WRITE_CKD:
265  case DASD_ECKD_CCW_WRITE_CKD_MT:
266  data->attributes.operation = DASD_BYPASS_CACHE;
267  rc = check_XRC (ccw, data, device);
268  break;
269  case DASD_ECKD_CCW_ERASE:
270  case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
271  case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
272  data->mask.perm = 0x3;
273  data->mask.auth = 0x1;
274  data->attributes.operation = DASD_BYPASS_CACHE;
275  rc = check_XRC (ccw, data, device);
276  break;
277  default:
278  dev_err(&device->cdev->dev,
279  "0x%x is not a known command\n", cmd);
280  break;
281  }
282 
283  data->attributes.mode = 0x3; /* ECKD */
284 
285  if ((private->rdc_data.cu_type == 0x2105 ||
286  private->rdc_data.cu_type == 0x2107 ||
287  private->rdc_data.cu_type == 0x1750)
288  && !(private->uses_cdl && trk < 2))
289  data->ga_extended |= 0x40; /* Regular Data Format Mode */
290 
291  heads = private->rdc_data.trk_per_cyl;
292  begcyl = trk / heads;
293  beghead = trk % heads;
294  endcyl = totrk / heads;
295  endhead = totrk % heads;
296 
297  /* check for sequential prestage - enhance cylinder range */
298  if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
299  data->attributes.operation == DASD_SEQ_ACCESS) {
300 
301  if (endcyl + private->attrib.nr_cyl < private->real_cyl)
302  endcyl += private->attrib.nr_cyl;
303  else
304  endcyl = (private->real_cyl - 1);
305  }
306 
307  set_ch_t(&data->beg_ext, begcyl, beghead);
308  set_ch_t(&data->end_ext, endcyl, endhead);
309  return rc;
310 }
311 
312 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
313  struct dasd_device *device)
314 {
315  struct dasd_eckd_private *private;
316  int rc;
317 
318  private = (struct dasd_eckd_private *) device->private;
319  if (!private->rdc_data.facilities.XRC_supported)
320  return 0;
321 
322  /* switch on System Time Stamp - needed for XRC Support */
323  pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid' */
324  pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
325  pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
326 
327  rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
328  /* Ignore return code if sync clock is switched off. */
329  if (rc == -EOPNOTSUPP || rc == -EACCES)
330  rc = 0;
331  return rc;
332 }
333 
334 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
335  unsigned int rec_on_trk, int count, int cmd,
336  struct dasd_device *device, unsigned int reclen,
337  unsigned int tlf)
338 {
339  struct dasd_eckd_private *private;
340  int sector;
341  int dn, d;
342 
343  private = (struct dasd_eckd_private *) device->private;
344 
345  memset(data, 0, sizeof(*data));
346  sector = 0;
347  if (rec_on_trk) {
348  switch (private->rdc_data.dev_type) {
349  case 0x3390:
350  dn = ceil_quot(reclen + 6, 232);
351  d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
352  sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
353  break;
354  case 0x3380:
355  d = 7 + ceil_quot(reclen + 12, 32);
356  sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
357  break;
358  }
359  }
360  data->sector = sector;
361  /* note: meaning of count depends on the operation
362  * for record based I/O it's the number of records, but for
363  * track based I/O it's the number of tracks
364  */
365  data->count = count;
366  switch (cmd) {
367  case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
368  data->operation.orientation = 0x3;
369  data->operation.operation = 0x03;
370  break;
371  case DASD_ECKD_CCW_READ_HOME_ADDRESS:
372  data->operation.orientation = 0x3;
373  data->operation.operation = 0x16;
374  break;
375  case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
376  data->operation.orientation = 0x1;
377  data->operation.operation = 0x03;
378  data->count++;
379  break;
380  case DASD_ECKD_CCW_READ_RECORD_ZERO:
381  data->operation.orientation = 0x3;
382  data->operation.operation = 0x16;
383  data->count++;
384  break;
385  case DASD_ECKD_CCW_WRITE:
386  case DASD_ECKD_CCW_WRITE_MT:
387  case DASD_ECKD_CCW_WRITE_KD:
388  case DASD_ECKD_CCW_WRITE_KD_MT:
389  data->auxiliary.length_valid = 0x1;
390  data->length = reclen;
391  data->operation.operation = 0x01;
392  break;
393  case DASD_ECKD_CCW_WRITE_CKD:
394  case DASD_ECKD_CCW_WRITE_CKD_MT:
395  data->auxiliary.length_valid = 0x1;
396  data->length = reclen;
397  data->operation.operation = 0x03;
398  break;
399  case DASD_ECKD_CCW_WRITE_FULL_TRACK:
400  data->operation.orientation = 0x0;
401  data->operation.operation = 0x3F;
402  data->extended_operation = 0x11;
403  data->length = 0;
404  data->extended_parameter_length = 0x02;
405  if (data->count > 8) {
406  data->extended_parameter[0] = 0xFF;
407  data->extended_parameter[1] = 0xFF;
408  data->extended_parameter[1] <<= (16 - count);
409  } else {
410  data->extended_parameter[0] = 0xFF;
411  data->extended_parameter[0] <<= (8 - count);
412  data->extended_parameter[1] = 0x00;
413  }
414  data->sector = 0xFF;
415  break;
416  case DASD_ECKD_CCW_WRITE_TRACK_DATA:
417  data->auxiliary.length_valid = 0x1;
418  data->length = reclen; /* not tlf, as one might think */
419  data->operation.operation = 0x3F;
420  data->extended_operation = 0x23;
421  break;
422  case DASD_ECKD_CCW_READ:
423  case DASD_ECKD_CCW_READ_MT:
424  case DASD_ECKD_CCW_READ_KD:
425  case DASD_ECKD_CCW_READ_KD_MT:
426  data->auxiliary.length_valid = 0x1;
427  data->length = reclen;
428  data->operation.operation = 0x06;
429  break;
430  case DASD_ECKD_CCW_READ_CKD:
431  case DASD_ECKD_CCW_READ_CKD_MT:
432  data->auxiliary.length_valid = 0x1;
433  data->length = reclen;
434  data->operation.operation = 0x16;
435  break;
436  case DASD_ECKD_CCW_READ_COUNT:
437  data->operation.operation = 0x06;
438  break;
439  case DASD_ECKD_CCW_READ_TRACK:
440  data->operation.orientation = 0x1;
441  data->operation.operation = 0x0C;
442  data->extended_parameter_length = 0;
443  data->sector = 0xFF;
444  break;
445  case DASD_ECKD_CCW_READ_TRACK_DATA:
446  data->auxiliary.length_valid = 0x1;
447  data->length = tlf;
448  data->operation.operation = 0x0C;
449  break;
450  case DASD_ECKD_CCW_ERASE:
451  data->length = reclen;
452  data->auxiliary.length_valid = 0x1;
453  data->operation.operation = 0x0b;
454  break;
455  default:
456  DBF_DEV_EVENT(DBF_ERR, device,
457  "fill LRE unknown opcode 0x%x", cmd);
458  BUG();
459  }
460  set_ch_t(&data->seek_addr,
461  trk / private->rdc_data.trk_per_cyl,
462  trk % private->rdc_data.trk_per_cyl);
463  data->search_arg.cyl = data->seek_addr.cyl;
464  data->search_arg.head = data->seek_addr.head;
465  data->search_arg.record = rec_on_trk;
466 }
467 
468 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
469  unsigned int trk, unsigned int totrk, int cmd,
470  struct dasd_device *basedev, struct dasd_device *startdev,
471  unsigned char format, unsigned int rec_on_trk, int count,
472  unsigned int blksize, unsigned int tlf)
473 {
474  struct dasd_eckd_private *basepriv, *startpriv;
475  struct DE_eckd_data *dedata;
476  struct LRE_eckd_data *lredata;
477  u32 begcyl, endcyl;
478  u16 heads, beghead, endhead;
479  int rc = 0;
480 
481  basepriv = (struct dasd_eckd_private *) basedev->private;
482  startpriv = (struct dasd_eckd_private *) startdev->private;
483  dedata = &pfxdata->define_extent;
484  lredata = &pfxdata->locate_record;
485 
486  ccw->cmd_code = DASD_ECKD_CCW_PFX;
487  ccw->flags = 0;
488  if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
489  ccw->count = sizeof(*pfxdata) + 2;
490  ccw->cda = (__u32) __pa(pfxdata);
491  memset(pfxdata, 0, sizeof(*pfxdata) + 2);
492  } else {
493  ccw->count = sizeof(*pfxdata);
494  ccw->cda = (__u32) __pa(pfxdata);
495  memset(pfxdata, 0, sizeof(*pfxdata));
496  }
497 
498  /* prefix data */
499  if (format > 1) {
500  DBF_DEV_EVENT(DBF_ERR, basedev,
501  "PFX LRE unknown format 0x%x", format);
502  BUG();
503  return -EINVAL;
504  }
505  pfxdata->format = format;
506  pfxdata->base_address = basepriv->ned->unit_addr;
507  pfxdata->base_lss = basepriv->ned->ID;
508  pfxdata->validity.define_extent = 1;
509 
510  /* private uid is kept up to date, conf_data may be outdated */
511  if (startpriv->uid.type != UA_BASE_DEVICE) {
512  pfxdata->validity.verify_base = 1;
513  if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
514  pfxdata->validity.hyper_pav = 1;
515  }
516 
517  /* define extend data (mostly)*/
518  switch (cmd) {
519  case DASD_ECKD_CCW_READ_HOME_ADDRESS:
520  case DASD_ECKD_CCW_READ_RECORD_ZERO:
521  case DASD_ECKD_CCW_READ:
522  case DASD_ECKD_CCW_READ_MT:
523  case DASD_ECKD_CCW_READ_CKD:
524  case DASD_ECKD_CCW_READ_CKD_MT:
525  case DASD_ECKD_CCW_READ_KD:
526  case DASD_ECKD_CCW_READ_KD_MT:
527  case DASD_ECKD_CCW_READ_COUNT:
528  dedata->mask.perm = 0x1;
529  dedata->attributes.operation = basepriv->attrib.operation;
530  break;
531  case DASD_ECKD_CCW_READ_TRACK:
532  case DASD_ECKD_CCW_READ_TRACK_DATA:
533  dedata->mask.perm = 0x1;
534  dedata->attributes.operation = basepriv->attrib.operation;
535  dedata->blk_size = 0;
536  break;
537  case DASD_ECKD_CCW_WRITE:
538  case DASD_ECKD_CCW_WRITE_MT:
539  case DASD_ECKD_CCW_WRITE_KD:
540  case DASD_ECKD_CCW_WRITE_KD_MT:
541  dedata->mask.perm = 0x02;
542  dedata->attributes.operation = basepriv->attrib.operation;
543  rc = check_XRC_on_prefix(pfxdata, basedev);
544  break;
545  case DASD_ECKD_CCW_WRITE_CKD:
546  case DASD_ECKD_CCW_WRITE_CKD_MT:
547  dedata->attributes.operation = DASD_BYPASS_CACHE;
548  rc = check_XRC_on_prefix(pfxdata, basedev);
549  break;
550  case DASD_ECKD_CCW_ERASE:
551  case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
552  case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
553  dedata->mask.perm = 0x3;
554  dedata->mask.auth = 0x1;
555  dedata->attributes.operation = DASD_BYPASS_CACHE;
556  rc = check_XRC_on_prefix(pfxdata, basedev);
557  break;
558  case DASD_ECKD_CCW_WRITE_FULL_TRACK:
559  dedata->mask.perm = 0x03;
560  dedata->attributes.operation = basepriv->attrib.operation;
561  dedata->blk_size = 0;
562  break;
563  case DASD_ECKD_CCW_WRITE_TRACK_DATA:
564  dedata->mask.perm = 0x02;
565  dedata->attributes.operation = basepriv->attrib.operation;
566  dedata->blk_size = blksize;
567  rc = check_XRC_on_prefix(pfxdata, basedev);
568  break;
569  default:
570  DBF_DEV_EVENT(DBF_ERR, basedev,
571  "PFX LRE unknown opcode 0x%x", cmd);
572  BUG();
573  return -EINVAL;
574  }
575 
576  dedata->attributes.mode = 0x3; /* ECKD */
577 
578  if ((basepriv->rdc_data.cu_type == 0x2105 ||
579  basepriv->rdc_data.cu_type == 0x2107 ||
580  basepriv->rdc_data.cu_type == 0x1750)
581  && !(basepriv->uses_cdl && trk < 2))
582  dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
583 
584  heads = basepriv->rdc_data.trk_per_cyl;
585  begcyl = trk / heads;
586  beghead = trk % heads;
587  endcyl = totrk / heads;
588  endhead = totrk % heads;
589 
590  /* check for sequential prestage - enhance cylinder range */
591  if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
592  dedata->attributes.operation == DASD_SEQ_ACCESS) {
593 
594  if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
595  endcyl += basepriv->attrib.nr_cyl;
596  else
597  endcyl = (basepriv->real_cyl - 1);
598  }
599 
600  set_ch_t(&dedata->beg_ext, begcyl, beghead);
601  set_ch_t(&dedata->end_ext, endcyl, endhead);
602 
603  if (format == 1) {
604  fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
605  basedev, blksize, tlf);
606  }
607 
608  return rc;
609 }
610 
611 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
612  unsigned int trk, unsigned int totrk, int cmd,
613  struct dasd_device *basedev, struct dasd_device *startdev)
614 {
615  return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
616  0, 0, 0, 0, 0);
617 }
618 
619 static void
620 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
621  unsigned int rec_on_trk, int no_rec, int cmd,
622  struct dasd_device * device, int reclen)
623 {
624  struct dasd_eckd_private *private;
625  int sector;
626  int dn, d;
627 
628  private = (struct dasd_eckd_private *) device->private;
629 
630  DBF_DEV_EVENT(DBF_INFO, device,
631  "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
632  trk, rec_on_trk, no_rec, cmd, reclen);
633 
634  ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
635  ccw->flags = 0;
636  ccw->count = 16;
637  ccw->cda = (__u32) __pa(data);
638 
639  memset(data, 0, sizeof(struct LO_eckd_data));
640  sector = 0;
641  if (rec_on_trk) {
642  switch (private->rdc_data.dev_type) {
643  case 0x3390:
644  dn = ceil_quot(reclen + 6, 232);
645  d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
646  sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
647  break;
648  case 0x3380:
649  d = 7 + ceil_quot(reclen + 12, 32);
650  sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
651  break;
652  }
653  }
654  data->sector = sector;
655  data->count = no_rec;
656  switch (cmd) {
657  case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
658  data->operation.orientation = 0x3;
659  data->operation.operation = 0x03;
660  break;
661  case DASD_ECKD_CCW_READ_HOME_ADDRESS:
662  data->operation.orientation = 0x3;
663  data->operation.operation = 0x16;
664  break;
665  case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
666  data->operation.orientation = 0x1;
667  data->operation.operation = 0x03;
668  data->count++;
669  break;
670  case DASD_ECKD_CCW_READ_RECORD_ZERO:
671  data->operation.orientation = 0x3;
672  data->operation.operation = 0x16;
673  data->count++;
674  break;
675  case DASD_ECKD_CCW_WRITE:
676  case DASD_ECKD_CCW_WRITE_MT:
677  case DASD_ECKD_CCW_WRITE_KD:
678  case DASD_ECKD_CCW_WRITE_KD_MT:
679  data->auxiliary.last_bytes_used = 0x1;
680  data->length = reclen;
681  data->operation.operation = 0x01;
682  break;
683  case DASD_ECKD_CCW_WRITE_CKD:
684  case DASD_ECKD_CCW_WRITE_CKD_MT:
685  data->auxiliary.last_bytes_used = 0x1;
686  data->length = reclen;
687  data->operation.operation = 0x03;
688  break;
689  case DASD_ECKD_CCW_READ:
690  case DASD_ECKD_CCW_READ_MT:
691  case DASD_ECKD_CCW_READ_KD:
692  case DASD_ECKD_CCW_READ_KD_MT:
693  data->auxiliary.last_bytes_used = 0x1;
694  data->length = reclen;
695  data->operation.operation = 0x06;
696  break;
697  case DASD_ECKD_CCW_READ_CKD:
698  case DASD_ECKD_CCW_READ_CKD_MT:
699  data->auxiliary.last_bytes_used = 0x1;
700  data->length = reclen;
701  data->operation.operation = 0x16;
702  break;
703  case DASD_ECKD_CCW_READ_COUNT:
704  data->operation.operation = 0x06;
705  break;
706  case DASD_ECKD_CCW_ERASE:
707  data->length = reclen;
708  data->auxiliary.last_bytes_used = 0x1;
709  data->operation.operation = 0x0b;
710  break;
711  default:
712  DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
713  "opcode 0x%x", cmd);
714  }
715  set_ch_t(&data->seek_addr,
716  trk / private->rdc_data.trk_per_cyl,
717  trk % private->rdc_data.trk_per_cyl);
718  data->search_arg.cyl = data->seek_addr.cyl;
719  data->search_arg.head = data->seek_addr.head;
720  data->search_arg.record = rec_on_trk;
721 }
722 
723 /*
724  * Returns 1 if the block is one of the special blocks that needs
725  * to get read/written with the KD variant of the command.
726  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
727  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
728  * Luckily the KD variants differ only by one bit (0x08) from the
729  * normal variant. So don't wonder about code like:
730  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
731  * ccw->cmd_code |= 0x8;
732  */
733 static inline int
734 dasd_eckd_cdl_special(int blk_per_trk, int recid)
735 {
736  if (recid < 3)
737  return 1;
738  if (recid < blk_per_trk)
739  return 0;
740  if (recid < 2 * blk_per_trk)
741  return 1;
742  return 0;
743 }
744 
745 /*
746  * Returns the record size for the special blocks of the cdl format.
747  * Only returns something useful if dasd_eckd_cdl_special is true
748  * for the recid.
749  */
750 static inline int
751 dasd_eckd_cdl_reclen(int recid)
752 {
753  if (recid < 3)
754  return sizes_trk0[recid];
755  return LABEL_SIZE;
756 }
757 /* create unique id from private structure. */
758 static void create_uid(struct dasd_eckd_private *private)
759 {
760  int count;
761  struct dasd_uid *uid;
762 
763  uid = &private->uid;
764  memset(uid, 0, sizeof(struct dasd_uid));
765  memcpy(uid->vendor, private->ned->HDA_manufacturer,
766  sizeof(uid->vendor) - 1);
767  EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
768  memcpy(uid->serial, private->ned->HDA_location,
769  sizeof(uid->serial) - 1);
770  EBCASC(uid->serial, sizeof(uid->serial) - 1);
771  uid->ssid = private->gneq->subsystemID;
772  uid->real_unit_addr = private->ned->unit_addr;
773  if (private->sneq) {
774  uid->type = private->sneq->sua_flags;
775  if (uid->type == UA_BASE_PAV_ALIAS)
776  uid->base_unit_addr = private->sneq->base_unit_addr;
777  } else {
778  uid->type = UA_BASE_DEVICE;
779  }
780  if (private->vdsneq) {
781  for (count = 0; count < 16; count++) {
782  sprintf(uid->vduit+2*count, "%02x",
783  private->vdsneq->uit[count]);
784  }
785  }
786 }
787 
788 /*
789  * Generate device unique id that specifies the physical device.
790  */
791 static int dasd_eckd_generate_uid(struct dasd_device *device)
792 {
793  struct dasd_eckd_private *private;
794  unsigned long flags;
795 
796  private = (struct dasd_eckd_private *) device->private;
797  if (!private)
798  return -ENODEV;
799  if (!private->ned || !private->gneq)
800  return -ENODEV;
801  spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
802  create_uid(private);
803  spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
804  return 0;
805 }
806 
807 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
808 {
809  struct dasd_eckd_private *private;
810  unsigned long flags;
811 
812  if (device->private) {
813  private = (struct dasd_eckd_private *)device->private;
814  spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
815  *uid = private->uid;
816  spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
817  return 0;
818  }
819  return -EINVAL;
820 }
821 
822 /*
823  * compare device UID with data of a given dasd_eckd_private structure
824  * return 0 for match
825  */
826 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
827  struct dasd_eckd_private *private)
828 {
829  struct dasd_uid device_uid;
830 
831  create_uid(private);
832  dasd_eckd_get_uid(device, &device_uid);
833 
834  return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
835 }
836 
837 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
838  struct dasd_ccw_req *cqr,
839  __u8 *rcd_buffer,
840  __u8 lpm)
841 {
842  struct ccw1 *ccw;
843  /*
844  * buffer has to start with EBCDIC "V1.0" to show
845  * support for virtual device SNEQ
846  */
847  rcd_buffer[0] = 0xE5;
848  rcd_buffer[1] = 0xF1;
849  rcd_buffer[2] = 0x4B;
850  rcd_buffer[3] = 0xF0;
851 
852  ccw = cqr->cpaddr;
853  ccw->cmd_code = DASD_ECKD_CCW_RCD;
854  ccw->flags = 0;
855  ccw->cda = (__u32)(addr_t)rcd_buffer;
856  ccw->count = DASD_ECKD_RCD_DATA_SIZE;
857  cqr->magic = DASD_ECKD_MAGIC;
858 
859  cqr->startdev = device;
860  cqr->memdev = device;
861  cqr->block = NULL;
862  cqr->expires = 10*HZ;
863  cqr->lpm = lpm;
864  cqr->retries = 256;
865  cqr->buildclk = get_clock();
866  cqr->status = DASD_CQR_FILLED;
867  set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
868 }
869 
870 /*
871  * Wakeup helper for read_conf
872  * if the cqr is not done and needs some error recovery
873  * the buffer has to be re-initialized with the EBCDIC "V1.0"
874  * to show support for virtual device SNEQ
875  */
876 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
877 {
878  struct ccw1 *ccw;
879  __u8 *rcd_buffer;
880 
881  if (cqr->status != DASD_CQR_DONE) {
882  ccw = cqr->cpaddr;
883  rcd_buffer = (__u8 *)((addr_t) ccw->cda);
884  memset(rcd_buffer, 0, sizeof(*rcd_buffer));
885 
886  rcd_buffer[0] = 0xE5;
887  rcd_buffer[1] = 0xF1;
888  rcd_buffer[2] = 0x4B;
889  rcd_buffer[3] = 0xF0;
890  }
891  dasd_wakeup_cb(cqr, data);
892 }
893 
894 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
895  struct dasd_ccw_req *cqr,
896  __u8 *rcd_buffer,
897  __u8 lpm)
898 {
899  struct ciw *ciw;
900  int rc;
901  /*
902  * sanity check: scan for RCD command in extended SenseID data
903  * some devices do not support RCD
904  */
905  ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
906  if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
907  return -EOPNOTSUPP;
908 
909  dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
910  clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
911  set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
912  cqr->retries = 5;
913  cqr->callback = read_conf_cb;
914  rc = dasd_sleep_on_immediatly(cqr);
915  return rc;
916 }
917 
918 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
919  void **rcd_buffer,
920  int *rcd_buffer_size, __u8 lpm)
921 {
922  struct ciw *ciw;
923  char *rcd_buf = NULL;
924  int ret;
925  struct dasd_ccw_req *cqr;
926 
927  /*
928  * sanity check: scan for RCD command in extended SenseID data
929  * some devices do not support RCD
930  */
931  ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
932  if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
933  ret = -EOPNOTSUPP;
934  goto out_error;
935  }
936  rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
937  if (!rcd_buf) {
938  ret = -ENOMEM;
939  goto out_error;
940  }
941  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
942  0, /* use rcd_buf as data ara */
943  device);
944  if (IS_ERR(cqr)) {
945  DBF_DEV_EVENT(DBF_WARNING, device, "%s",
946  "Could not allocate RCD request");
947  ret = -ENOMEM;
948  goto out_error;
949  }
950  dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
951  cqr->callback = read_conf_cb;
952  ret = dasd_sleep_on(cqr);
953  /*
954  * on success we update the user input parms
955  */
956  dasd_sfree_request(cqr, cqr->memdev);
957  if (ret)
958  goto out_error;
959 
960  *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
961  *rcd_buffer = rcd_buf;
962  return 0;
963 out_error:
964  kfree(rcd_buf);
965  *rcd_buffer = NULL;
966  *rcd_buffer_size = 0;
967  return ret;
968 }
969 
970 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
971 {
972 
973  struct dasd_sneq *sneq;
974  int i, count;
975 
976  private->ned = NULL;
977  private->sneq = NULL;
978  private->vdsneq = NULL;
979  private->gneq = NULL;
980  count = private->conf_len / sizeof(struct dasd_sneq);
981  sneq = (struct dasd_sneq *)private->conf_data;
982  for (i = 0; i < count; ++i) {
983  if (sneq->flags.identifier == 1 && sneq->format == 1)
984  private->sneq = sneq;
985  else if (sneq->flags.identifier == 1 && sneq->format == 4)
986  private->vdsneq = (struct vd_sneq *)sneq;
987  else if (sneq->flags.identifier == 2)
988  private->gneq = (struct dasd_gneq *)sneq;
989  else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
990  private->ned = (struct dasd_ned *)sneq;
991  sneq++;
992  }
993  if (!private->ned || !private->gneq) {
994  private->ned = NULL;
995  private->sneq = NULL;
996  private->vdsneq = NULL;
997  private->gneq = NULL;
998  return -EINVAL;
999  }
1000  return 0;
1001 
1002 };
1003 
1004 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1005 {
1006  struct dasd_gneq *gneq;
1007  int i, count, found;
1008 
1009  count = conf_len / sizeof(*gneq);
1010  gneq = (struct dasd_gneq *)conf_data;
1011  found = 0;
1012  for (i = 0; i < count; ++i) {
1013  if (gneq->flags.identifier == 2) {
1014  found = 1;
1015  break;
1016  }
1017  gneq++;
1018  }
1019  if (found)
1020  return ((char *)gneq)[18] & 0x07;
1021  else
1022  return 0;
1023 }
1024 
1025 static int dasd_eckd_read_conf(struct dasd_device *device)
1026 {
1027  void *conf_data;
1028  int conf_len, conf_data_saved;
1029  int rc;
1030  __u8 lpm, opm;
1031  struct dasd_eckd_private *private, path_private;
1032  struct dasd_path *path_data;
1033  struct dasd_uid *uid;
1034  char print_path_uid[60], print_device_uid[60];
1035 
1036  private = (struct dasd_eckd_private *) device->private;
1037  path_data = &device->path_data;
1038  opm = ccw_device_get_path_mask(device->cdev);
1039  conf_data_saved = 0;
1040  /* get configuration data per operational path */
1041  for (lpm = 0x80; lpm; lpm>>= 1) {
1042  if (!(lpm & opm))
1043  continue;
1044  rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1045  &conf_len, lpm);
1046  if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
1047  DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1048  "Read configuration data returned "
1049  "error %d", rc);
1050  return rc;
1051  }
1052  if (conf_data == NULL) {
1053  DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1054  "No configuration data "
1055  "retrieved");
1056  /* no further analysis possible */
1057  path_data->opm |= lpm;
1058  continue; /* no error */
1059  }
1060  /* save first valid configuration data */
1061  if (!conf_data_saved) {
1062  kfree(private->conf_data);
1063  private->conf_data = conf_data;
1064  private->conf_len = conf_len;
1065  if (dasd_eckd_identify_conf_parts(private)) {
1066  private->conf_data = NULL;
1067  private->conf_len = 0;
1068  kfree(conf_data);
1069  continue;
1070  }
1071  /*
1072  * build device UID that other path data
1073  * can be compared to it
1074  */
1075  dasd_eckd_generate_uid(device);
1076  conf_data_saved++;
1077  } else {
1078  path_private.conf_data = conf_data;
1079  path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1080  if (dasd_eckd_identify_conf_parts(
1081  &path_private)) {
1082  path_private.conf_data = NULL;
1083  path_private.conf_len = 0;
1084  kfree(conf_data);
1085  continue;
1086  }
1087 
1088  if (dasd_eckd_compare_path_uid(
1089  device, &path_private)) {
1090  uid = &path_private.uid;
1091  if (strlen(uid->vduit) > 0)
1092  snprintf(print_path_uid,
1093  sizeof(print_path_uid),
1094  "%s.%s.%04x.%02x.%s",
1095  uid->vendor, uid->serial,
1096  uid->ssid, uid->real_unit_addr,
1097  uid->vduit);
1098  else
1099  snprintf(print_path_uid,
1100  sizeof(print_path_uid),
1101  "%s.%s.%04x.%02x",
1102  uid->vendor, uid->serial,
1103  uid->ssid,
1104  uid->real_unit_addr);
1105  uid = &private->uid;
1106  if (strlen(uid->vduit) > 0)
1107  snprintf(print_device_uid,
1108  sizeof(print_device_uid),
1109  "%s.%s.%04x.%02x.%s",
1110  uid->vendor, uid->serial,
1111  uid->ssid, uid->real_unit_addr,
1112  uid->vduit);
1113  else
1114  snprintf(print_device_uid,
1115  sizeof(print_device_uid),
1116  "%s.%s.%04x.%02x",
1117  uid->vendor, uid->serial,
1118  uid->ssid,
1119  uid->real_unit_addr);
1120  dev_err(&device->cdev->dev,
1121  "Not all channel paths lead to "
1122  "the same device, path %02X leads to "
1123  "device %s instead of %s\n", lpm,
1124  print_path_uid, print_device_uid);
1125  return -EINVAL;
1126  }
1127 
1128  path_private.conf_data = NULL;
1129  path_private.conf_len = 0;
1130  }
1131  switch (dasd_eckd_path_access(conf_data, conf_len)) {
1132  case 0x02:
1133  path_data->npm |= lpm;
1134  break;
1135  case 0x03:
1136  path_data->ppm |= lpm;
1137  break;
1138  }
1139  path_data->opm |= lpm;
1140 
1141  if (conf_data != private->conf_data)
1142  kfree(conf_data);
1143  }
1144 
1145  return 0;
1146 }
1147 
1148 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1149 {
1150  struct dasd_eckd_private *private;
1151  int mdc;
1152  u32 fcx_max_data;
1153 
1154  private = (struct dasd_eckd_private *) device->private;
1155  if (private->fcx_max_data) {
1156  mdc = ccw_device_get_mdc(device->cdev, lpm);
1157  if ((mdc < 0)) {
1158  dev_warn(&device->cdev->dev,
1159  "Detecting the maximum data size for zHPF "
1160  "requests failed (rc=%d) for a new path %x\n",
1161  mdc, lpm);
1162  return mdc;
1163  }
1164  fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1165  if (fcx_max_data < private->fcx_max_data) {
1166  dev_warn(&device->cdev->dev,
1167  "The maximum data size for zHPF requests %u "
1168  "on a new path %x is below the active maximum "
1169  "%u\n", fcx_max_data, lpm,
1170  private->fcx_max_data);
1171  return -EACCES;
1172  }
1173  }
1174  return 0;
1175 }
1176 
1177 static int rebuild_device_uid(struct dasd_device *device,
1178  struct path_verification_work_data *data)
1179 {
1180  struct dasd_eckd_private *private;
1181  struct dasd_path *path_data;
1182  __u8 lpm, opm;
1183  int rc;
1184 
1185  rc = -ENODEV;
1186  private = (struct dasd_eckd_private *) device->private;
1187  path_data = &device->path_data;
1188  opm = device->path_data.opm;
1189 
1190  for (lpm = 0x80; lpm; lpm >>= 1) {
1191  if (!(lpm & opm))
1192  continue;
1193  memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1194  memset(&data->cqr, 0, sizeof(data->cqr));
1195  data->cqr.cpaddr = &data->ccw;
1196  rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1197  data->rcd_buffer,
1198  lpm);
1199 
1200  if (rc) {
1201  if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1202  continue;
1203  DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1204  "Read configuration data "
1205  "returned error %d", rc);
1206  break;
1207  }
1208  memcpy(private->conf_data, data->rcd_buffer,
1209  DASD_ECKD_RCD_DATA_SIZE);
1210  if (dasd_eckd_identify_conf_parts(private)) {
1211  rc = -ENODEV;
1212  } else /* first valid path is enough */
1213  break;
1214  }
1215 
1216  if (!rc)
1217  rc = dasd_eckd_generate_uid(device);
1218 
1219  return rc;
1220 }
1221 
1222 static void do_path_verification_work(struct work_struct *work)
1223 {
1224  struct path_verification_work_data *data;
1225  struct dasd_device *device;
1226  struct dasd_eckd_private path_private;
1227  struct dasd_uid *uid;
1228  __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1229  __u8 lpm, opm, npm, ppm, epm;
1230  unsigned long flags;
1231  char print_uid[60];
1232  int rc;
1233 
1234  data = container_of(work, struct path_verification_work_data, worker);
1235  device = data->device;
1236 
1237  /* delay path verification until device was resumed */
1238  if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1239  schedule_work(work);
1240  return;
1241  }
1242 
1243  opm = 0;
1244  npm = 0;
1245  ppm = 0;
1246  epm = 0;
1247  for (lpm = 0x80; lpm; lpm >>= 1) {
1248  if (!(lpm & data->tbvpm))
1249  continue;
1250  memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1251  memset(&data->cqr, 0, sizeof(data->cqr));
1252  data->cqr.cpaddr = &data->ccw;
1253  rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1254  data->rcd_buffer,
1255  lpm);
1256  if (!rc) {
1257  switch (dasd_eckd_path_access(data->rcd_buffer,
1258  DASD_ECKD_RCD_DATA_SIZE)
1259  ) {
1260  case 0x02:
1261  npm |= lpm;
1262  break;
1263  case 0x03:
1264  ppm |= lpm;
1265  break;
1266  }
1267  opm |= lpm;
1268  } else if (rc == -EOPNOTSUPP) {
1269  DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1270  "path verification: No configuration "
1271  "data retrieved");
1272  opm |= lpm;
1273  } else if (rc == -EAGAIN) {
1274  DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1275  "path verification: device is stopped,"
1276  " try again later");
1277  epm |= lpm;
1278  } else {
1279  dev_warn(&device->cdev->dev,
1280  "Reading device feature codes failed "
1281  "(rc=%d) for new path %x\n", rc, lpm);
1282  continue;
1283  }
1284  if (verify_fcx_max_data(device, lpm)) {
1285  opm &= ~lpm;
1286  npm &= ~lpm;
1287  ppm &= ~lpm;
1288  continue;
1289  }
1290 
1291  /*
1292  * save conf_data for comparison after
1293  * rebuild_device_uid may have changed
1294  * the original data
1295  */
1296  memcpy(&path_rcd_buf, data->rcd_buffer,
1297  DASD_ECKD_RCD_DATA_SIZE);
1298  path_private.conf_data = (void *) &path_rcd_buf;
1299  path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1300  if (dasd_eckd_identify_conf_parts(&path_private)) {
1301  path_private.conf_data = NULL;
1302  path_private.conf_len = 0;
1303  continue;
1304  }
1305 
1306  /*
1307  * compare path UID with device UID only if at least
1308  * one valid path is left
1309  * in other case the device UID may have changed and
1310  * the first working path UID will be used as device UID
1311  */
1312  if (device->path_data.opm &&
1313  dasd_eckd_compare_path_uid(device, &path_private)) {
1314  /*
1315  * the comparison was not successful
1316  * rebuild the device UID with at least one
1317  * known path in case a z/VM hyperswap command
1318  * has changed the device
1319  *
1320  * after this compare again
1321  *
1322  * if either the rebuild or the recompare fails
1323  * the path can not be used
1324  */
1325  if (rebuild_device_uid(device, data) ||
1326  dasd_eckd_compare_path_uid(
1327  device, &path_private)) {
1328  uid = &path_private.uid;
1329  if (strlen(uid->vduit) > 0)
1330  snprintf(print_uid, sizeof(print_uid),
1331  "%s.%s.%04x.%02x.%s",
1332  uid->vendor, uid->serial,
1333  uid->ssid, uid->real_unit_addr,
1334  uid->vduit);
1335  else
1336  snprintf(print_uid, sizeof(print_uid),
1337  "%s.%s.%04x.%02x",
1338  uid->vendor, uid->serial,
1339  uid->ssid,
1340  uid->real_unit_addr);
1341  dev_err(&device->cdev->dev,
1342  "The newly added channel path %02X "
1343  "will not be used because it leads "
1344  "to a different device %s\n",
1345  lpm, print_uid);
1346  opm &= ~lpm;
1347  npm &= ~lpm;
1348  ppm &= ~lpm;
1349  continue;
1350  }
1351  }
1352 
1353  /*
1354  * There is a small chance that a path is lost again between
1355  * above path verification and the following modification of
1356  * the device opm mask. We could avoid that race here by using
1357  * yet another path mask, but we rather deal with this unlikely
1358  * situation in dasd_start_IO.
1359  */
1360  spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1361  if (!device->path_data.opm && opm) {
1362  device->path_data.opm = opm;
1363  dasd_generic_path_operational(device);
1364  } else
1365  device->path_data.opm |= opm;
1366  device->path_data.npm |= npm;
1367  device->path_data.ppm |= ppm;
1368  device->path_data.tbvpm |= epm;
1369  spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1370  }
1371 
1372  dasd_put_device(device);
1373  if (data->isglobal)
1374  mutex_unlock(&dasd_path_verification_mutex);
1375  else
1376  kfree(data);
1377 }
1378 
1379 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1380 {
1381  struct path_verification_work_data *data;
1382 
1383  data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1384  if (!data) {
1385  if (mutex_trylock(&dasd_path_verification_mutex)) {
1386  data = path_verification_worker;
1387  data->isglobal = 1;
1388  } else
1389  return -ENOMEM;
1390  } else {
1391  memset(data, 0, sizeof(*data));
1392  data->isglobal = 0;
1393  }
1394  INIT_WORK(&data->worker, do_path_verification_work);
1395  dasd_get_device(device);
1396  data->device = device;
1397  data->tbvpm = lpm;
1398  schedule_work(&data->worker);
1399  return 0;
1400 }
1401 
1402 static int dasd_eckd_read_features(struct dasd_device *device)
1403 {
1404  struct dasd_psf_prssd_data *prssdp;
1405  struct dasd_rssd_features *features;
1406  struct dasd_ccw_req *cqr;
1407  struct ccw1 *ccw;
1408  int rc;
1409  struct dasd_eckd_private *private;
1410 
1411  private = (struct dasd_eckd_private *) device->private;
1412  memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1413  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1414  (sizeof(struct dasd_psf_prssd_data) +
1415  sizeof(struct dasd_rssd_features)),
1416  device);
1417  if (IS_ERR(cqr)) {
1418  DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1419  "allocate initialization request");
1420  return PTR_ERR(cqr);
1421  }
1422  cqr->startdev = device;
1423  cqr->memdev = device;
1424  cqr->block = NULL;
1425  cqr->retries = 256;
1426  cqr->expires = 10 * HZ;
1427 
1428  /* Prepare for Read Subsystem Data */
1429  prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1430  memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1431  prssdp->order = PSF_ORDER_PRSSD;
1432  prssdp->suborder = 0x41; /* Read Feature Codes */
1433  /* all other bytes of prssdp must be zero */
1434 
1435  ccw = cqr->cpaddr;
1436  ccw->cmd_code = DASD_ECKD_CCW_PSF;
1437  ccw->count = sizeof(struct dasd_psf_prssd_data);
1438  ccw->flags |= CCW_FLAG_CC;
1439  ccw->cda = (__u32)(addr_t) prssdp;
1440 
1441  /* Read Subsystem Data - feature codes */
1442  features = (struct dasd_rssd_features *) (prssdp + 1);
1443  memset(features, 0, sizeof(struct dasd_rssd_features));
1444 
1445  ccw++;
1446  ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1447  ccw->count = sizeof(struct dasd_rssd_features);
1448  ccw->cda = (__u32)(addr_t) features;
1449 
1450  cqr->buildclk = get_clock();
1451  cqr->status = DASD_CQR_FILLED;
1452  rc = dasd_sleep_on(cqr);
1453  if (rc == 0) {
1454  prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1455  features = (struct dasd_rssd_features *) (prssdp + 1);
1456  memcpy(&private->features, features,
1457  sizeof(struct dasd_rssd_features));
1458  } else
1459  dev_warn(&device->cdev->dev, "Reading device feature codes"
1460  " failed with rc=%d\n", rc);
1461  dasd_sfree_request(cqr, cqr->memdev);
1462  return rc;
1463 }
1464 
1465 
1466 /*
1467  * Build CP for Perform Subsystem Function - SSC.
1468  */
1469 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1470  int enable_pav)
1471 {
1472  struct dasd_ccw_req *cqr;
1473  struct dasd_psf_ssc_data *psf_ssc_data;
1474  struct ccw1 *ccw;
1475 
1476  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1477  sizeof(struct dasd_psf_ssc_data),
1478  device);
1479 
1480  if (IS_ERR(cqr)) {
1481  DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1482  "Could not allocate PSF-SSC request");
1483  return cqr;
1484  }
1485  psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1486  psf_ssc_data->order = PSF_ORDER_SSC;
1487  psf_ssc_data->suborder = 0xc0;
1488  if (enable_pav) {
1489  psf_ssc_data->suborder |= 0x08;
1490  psf_ssc_data->reserved[0] = 0x88;
1491  }
1492  ccw = cqr->cpaddr;
1493  ccw->cmd_code = DASD_ECKD_CCW_PSF;
1494  ccw->cda = (__u32)(addr_t)psf_ssc_data;
1495  ccw->count = 66;
1496 
1497  cqr->startdev = device;
1498  cqr->memdev = device;
1499  cqr->block = NULL;
1500  cqr->retries = 256;
1501  cqr->expires = 10*HZ;
1502  cqr->buildclk = get_clock();
1503  cqr->status = DASD_CQR_FILLED;
1504  return cqr;
1505 }
1506 
1507 /*
1508  * Perform Subsystem Function.
1509  * It is necessary to trigger CIO for channel revalidation since this
1510  * call might change behaviour of DASD devices.
1511  */
1512 static int
1513 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1514  unsigned long flags)
1515 {
1516  struct dasd_ccw_req *cqr;
1517  int rc;
1518 
1519  cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1520  if (IS_ERR(cqr))
1521  return PTR_ERR(cqr);
1522 
1523  /*
1524  * set flags e.g. turn on failfast, to prevent blocking
1525  * the calling function should handle failed requests
1526  */
1527  cqr->flags |= flags;
1528 
1529  rc = dasd_sleep_on(cqr);
1530  if (!rc)
1531  /* trigger CIO to reprobe devices */
1532  css_schedule_reprobe();
1533  else if (cqr->intrc == -EAGAIN)
1534  rc = -EAGAIN;
1535 
1536  dasd_sfree_request(cqr, cqr->memdev);
1537  return rc;
1538 }
1539 
1540 /*
1541  * Valide storage server of current device.
1542  */
1543 static int dasd_eckd_validate_server(struct dasd_device *device,
1544  unsigned long flags)
1545 {
1546  int rc;
1547  struct dasd_eckd_private *private;
1548  int enable_pav;
1549 
1550  private = (struct dasd_eckd_private *) device->private;
1551  if (private->uid.type == UA_BASE_PAV_ALIAS ||
1552  private->uid.type == UA_HYPER_PAV_ALIAS)
1553  return 0;
1554  if (dasd_nopav || MACHINE_IS_VM)
1555  enable_pav = 0;
1556  else
1557  enable_pav = 1;
1558  rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1559 
1560  /* may be requested feature is not available on server,
1561  * therefore just report error and go ahead */
1562  DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1563  "returned rc=%d", private->uid.ssid, rc);
1564  return rc;
1565 }
1566 
1567 /*
1568  * worker to do a validate server in case of a lost pathgroup
1569  */
1570 static void dasd_eckd_do_validate_server(struct work_struct *work)
1571 {
1572  struct dasd_device *device = container_of(work, struct dasd_device,
1573  kick_validate);
1574  if (dasd_eckd_validate_server(device, DASD_CQR_FLAGS_FAILFAST)
1575  == -EAGAIN) {
1576  /* schedule worker again if failed */
1577  schedule_work(&device->kick_validate);
1578  return;
1579  }
1580 
1581  dasd_put_device(device);
1582 }
1583 
1584 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1585 {
1586  dasd_get_device(device);
1587  /* exit if device not online or in offline processing */
1588  if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1589  device->state < DASD_STATE_ONLINE) {
1590  dasd_put_device(device);
1591  return;
1592  }
1593  /* queue call to do_validate_server to the kernel event daemon. */
1594  schedule_work(&device->kick_validate);
1595 }
1596 
1597 static u32 get_fcx_max_data(struct dasd_device *device)
1598 {
1599 #if defined(CONFIG_64BIT)
1600  int tpm, mdc;
1601  int fcx_in_css, fcx_in_gneq, fcx_in_features;
1602  struct dasd_eckd_private *private;
1603 
1604  if (dasd_nofcx)
1605  return 0;
1606  /* is transport mode supported? */
1607  private = (struct dasd_eckd_private *) device->private;
1608  fcx_in_css = css_general_characteristics.fcx;
1609  fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1610  fcx_in_features = private->features.feature[40] & 0x80;
1611  tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1612 
1613  if (!tpm)
1614  return 0;
1615 
1616  mdc = ccw_device_get_mdc(device->cdev, 0);
1617  if (mdc < 0) {
1618  dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1619  " data size for zHPF requests failed\n");
1620  return 0;
1621  } else
1622  return mdc * FCX_MAX_DATA_FACTOR;
1623 #else
1624  return 0;
1625 #endif
1626 }
1627 
1628 /*
1629  * Check device characteristics.
1630  * If the device is accessible using ECKD discipline, the device is enabled.
1631  */
1632 static int
1633 dasd_eckd_check_characteristics(struct dasd_device *device)
1634 {
1635  struct dasd_eckd_private *private;
1636  struct dasd_block *block;
1637  struct dasd_uid temp_uid;
1638  int rc, i;
1639  int readonly;
1640  unsigned long value;
1641 
1642  /* setup work queue for validate server*/
1643  INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1644 
1645  if (!ccw_device_is_pathgroup(device->cdev)) {
1646  dev_warn(&device->cdev->dev,
1647  "A channel path group could not be established\n");
1648  return -EIO;
1649  }
1650  if (!ccw_device_is_multipath(device->cdev)) {
1651  dev_info(&device->cdev->dev,
1652  "The DASD is not operating in multipath mode\n");
1653  }
1654  private = (struct dasd_eckd_private *) device->private;
1655  if (!private) {
1656  private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1657  if (!private) {
1658  dev_warn(&device->cdev->dev,
1659  "Allocating memory for private DASD data "
1660  "failed\n");
1661  return -ENOMEM;
1662  }
1663  device->private = (void *) private;
1664  } else {
1665  memset(private, 0, sizeof(*private));
1666  }
1667  /* Invalidate status of initial analysis. */
1668  private->init_cqr_status = -1;
1669  /* Set default cache operations. */
1670  private->attrib.operation = DASD_NORMAL_CACHE;
1671  private->attrib.nr_cyl = 0;
1672 
1673  /* Read Configuration Data */
1674  rc = dasd_eckd_read_conf(device);
1675  if (rc)
1676  goto out_err1;
1677 
1678  /* set default timeout */
1679  device->default_expires = DASD_EXPIRES;
1680  if (private->gneq) {
1681  value = 1;
1682  for (i = 0; i < private->gneq->timeout.value; i++)
1683  value = 10 * value;
1684  value = value * private->gneq->timeout.number;
1685  /* do not accept useless values */
1686  if (value != 0 && value <= DASD_EXPIRES_MAX)
1687  device->default_expires = value;
1688  }
1689 
1690  dasd_eckd_get_uid(device, &temp_uid);
1691  if (temp_uid.type == UA_BASE_DEVICE) {
1692  block = dasd_alloc_block();
1693  if (IS_ERR(block)) {
1694  DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1695  "could not allocate dasd "
1696  "block structure");
1697  rc = PTR_ERR(block);
1698  goto out_err1;
1699  }
1700  device->block = block;
1701  block->base = device;
1702  }
1703 
1704  /* register lcu with alias handling, enable PAV */
1705  rc = dasd_alias_make_device_known_to_lcu(device);
1706  if (rc)
1707  goto out_err2;
1708 
1709  dasd_eckd_validate_server(device, 0);
1710 
1711  /* device may report different configuration data after LCU setup */
1712  rc = dasd_eckd_read_conf(device);
1713  if (rc)
1714  goto out_err3;
1715 
1716  /* Read Feature Codes */
1717  dasd_eckd_read_features(device);
1718 
1719  /* Read Device Characteristics */
1720  rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1721  &private->rdc_data, 64);
1722  if (rc) {
1723  DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1724  "Read device characteristic failed, rc=%d", rc);
1725  goto out_err3;
1726  }
1727 
1728  if ((device->features & DASD_FEATURE_USERAW) &&
1729  !(private->rdc_data.facilities.RT_in_LR)) {
1730  dev_err(&device->cdev->dev, "The storage server does not "
1731  "support raw-track access\n");
1732  rc = -EINVAL;
1733  goto out_err3;
1734  }
1735 
1736  /* find the valid cylinder size */
1737  if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1738  private->rdc_data.long_no_cyl)
1739  private->real_cyl = private->rdc_data.long_no_cyl;
1740  else
1741  private->real_cyl = private->rdc_data.no_cyl;
1742 
1743  private->fcx_max_data = get_fcx_max_data(device);
1744 
1745  readonly = dasd_device_is_ro(device);
1746  if (readonly)
1747  set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1748 
1749  dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1750  "with %d cylinders, %d heads, %d sectors%s\n",
1751  private->rdc_data.dev_type,
1752  private->rdc_data.dev_model,
1753  private->rdc_data.cu_type,
1754  private->rdc_data.cu_model.model,
1755  private->real_cyl,
1756  private->rdc_data.trk_per_cyl,
1757  private->rdc_data.sec_per_trk,
1758  readonly ? ", read-only device" : "");
1759  return 0;
1760 
1761 out_err3:
1762  dasd_alias_disconnect_device_from_lcu(device);
1763 out_err2:
1764  dasd_free_block(device->block);
1765  device->block = NULL;
1766 out_err1:
1767  kfree(private->conf_data);
1768  kfree(device->private);
1769  device->private = NULL;
1770  return rc;
1771 }
1772 
1773 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1774 {
1775  struct dasd_eckd_private *private;
1776 
1777  private = (struct dasd_eckd_private *) device->private;
1778  dasd_alias_disconnect_device_from_lcu(device);
1779  private->ned = NULL;
1780  private->sneq = NULL;
1781  private->vdsneq = NULL;
1782  private->gneq = NULL;
1783  private->conf_len = 0;
1784  kfree(private->conf_data);
1785  private->conf_data = NULL;
1786 }
1787 
1788 static struct dasd_ccw_req *
1789 dasd_eckd_analysis_ccw(struct dasd_device *device)
1790 {
1791  struct dasd_eckd_private *private;
1792  struct eckd_count *count_data;
1793  struct LO_eckd_data *LO_data;
1794  struct dasd_ccw_req *cqr;
1795  struct ccw1 *ccw;
1796  int cplength, datasize;
1797  int i;
1798 
1799  private = (struct dasd_eckd_private *) device->private;
1800 
1801  cplength = 8;
1802  datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1803  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1804  if (IS_ERR(cqr))
1805  return cqr;
1806  ccw = cqr->cpaddr;
1807  /* Define extent for the first 3 tracks. */
1808  define_extent(ccw++, cqr->data, 0, 2,
1809  DASD_ECKD_CCW_READ_COUNT, device);
1810  LO_data = cqr->data + sizeof(struct DE_eckd_data);
1811  /* Locate record for the first 4 records on track 0. */
1812  ccw[-1].flags |= CCW_FLAG_CC;
1813  locate_record(ccw++, LO_data++, 0, 0, 4,
1814  DASD_ECKD_CCW_READ_COUNT, device, 0);
1815 
1816  count_data = private->count_area;
1817  for (i = 0; i < 4; i++) {
1818  ccw[-1].flags |= CCW_FLAG_CC;
1819  ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1820  ccw->flags = 0;
1821  ccw->count = 8;
1822  ccw->cda = (__u32)(addr_t) count_data;
1823  ccw++;
1824  count_data++;
1825  }
1826 
1827  /* Locate record for the first record on track 2. */
1828  ccw[-1].flags |= CCW_FLAG_CC;
1829  locate_record(ccw++, LO_data++, 2, 0, 1,
1830  DASD_ECKD_CCW_READ_COUNT, device, 0);
1831  /* Read count ccw. */
1832  ccw[-1].flags |= CCW_FLAG_CC;
1833  ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1834  ccw->flags = 0;
1835  ccw->count = 8;
1836  ccw->cda = (__u32)(addr_t) count_data;
1837 
1838  cqr->block = NULL;
1839  cqr->startdev = device;
1840  cqr->memdev = device;
1841  cqr->retries = 255;
1842  cqr->buildclk = get_clock();
1843  cqr->status = DASD_CQR_FILLED;
1844  return cqr;
1845 }
1846 
1847 /* differentiate between 'no record found' and any other error */
1848 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1849 {
1850  char *sense;
1851  if (init_cqr->status == DASD_CQR_DONE)
1852  return INIT_CQR_OK;
1853  else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1854  init_cqr->status == DASD_CQR_FAILED) {
1855  sense = dasd_get_sense(&init_cqr->irb);
1856  if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1857  return INIT_CQR_UNFORMATTED;
1858  else
1859  return INIT_CQR_ERROR;
1860  } else
1861  return INIT_CQR_ERROR;
1862 }
1863 
1864 /*
1865  * This is the callback function for the init_analysis cqr. It saves
1866  * the status of the initial analysis ccw before it frees it and kicks
1867  * the device to continue the startup sequence. This will call
1868  * dasd_eckd_do_analysis again (if the devices has not been marked
1869  * for deletion in the meantime).
1870  */
1871 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1872  void *data)
1873 {
1874  struct dasd_eckd_private *private;
1875  struct dasd_device *device;
1876 
1877  device = init_cqr->startdev;
1878  private = (struct dasd_eckd_private *) device->private;
1879  private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1880  dasd_sfree_request(init_cqr, device);
1881  dasd_kick_device(device);
1882 }
1883 
1884 static int dasd_eckd_start_analysis(struct dasd_block *block)
1885 {
1886  struct dasd_ccw_req *init_cqr;
1887 
1888  init_cqr = dasd_eckd_analysis_ccw(block->base);
1889  if (IS_ERR(init_cqr))
1890  return PTR_ERR(init_cqr);
1891  init_cqr->callback = dasd_eckd_analysis_callback;
1892  init_cqr->callback_data = NULL;
1893  init_cqr->expires = 5*HZ;
1894  /* first try without ERP, so we can later handle unformatted
1895  * devices as special case
1896  */
1897  clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1898  init_cqr->retries = 0;
1899  dasd_add_request_head(init_cqr);
1900  return -EAGAIN;
1901 }
1902 
1903 static int dasd_eckd_end_analysis(struct dasd_block *block)
1904 {
1905  struct dasd_device *device;
1906  struct dasd_eckd_private *private;
1907  struct eckd_count *count_area;
1908  unsigned int sb, blk_per_trk;
1909  int status, i;
1910  struct dasd_ccw_req *init_cqr;
1911 
1912  device = block->base;
1913  private = (struct dasd_eckd_private *) device->private;
1914  status = private->init_cqr_status;
1915  private->init_cqr_status = -1;
1916  if (status == INIT_CQR_ERROR) {
1917  /* try again, this time with full ERP */
1918  init_cqr = dasd_eckd_analysis_ccw(device);
1919  dasd_sleep_on(init_cqr);
1920  status = dasd_eckd_analysis_evaluation(init_cqr);
1921  dasd_sfree_request(init_cqr, device);
1922  }
1923 
1924  if (device->features & DASD_FEATURE_USERAW) {
1925  block->bp_block = DASD_RAW_BLOCKSIZE;
1926  blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1927  block->s2b_shift = 3;
1928  goto raw;
1929  }
1930 
1931  if (status == INIT_CQR_UNFORMATTED) {
1932  dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1933  return -EMEDIUMTYPE;
1934  } else if (status == INIT_CQR_ERROR) {
1935  dev_err(&device->cdev->dev,
1936  "Detecting the DASD disk layout failed because "
1937  "of an I/O error\n");
1938  return -EIO;
1939  }
1940 
1941  private->uses_cdl = 1;
1942  /* Check Track 0 for Compatible Disk Layout */
1943  count_area = NULL;
1944  for (i = 0; i < 3; i++) {
1945  if (private->count_area[i].kl != 4 ||
1946  private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1947  private->count_area[i].cyl != 0 ||
1948  private->count_area[i].head != count_area_head[i] ||
1949  private->count_area[i].record != count_area_rec[i]) {
1950  private->uses_cdl = 0;
1951  break;
1952  }
1953  }
1954  if (i == 3)
1955  count_area = &private->count_area[4];
1956 
1957  if (private->uses_cdl == 0) {
1958  for (i = 0; i < 5; i++) {
1959  if ((private->count_area[i].kl != 0) ||
1960  (private->count_area[i].dl !=
1961  private->count_area[0].dl) ||
1962  private->count_area[i].cyl != 0 ||
1963  private->count_area[i].head != count_area_head[i] ||
1964  private->count_area[i].record != count_area_rec[i])
1965  break;
1966  }
1967  if (i == 5)
1968  count_area = &private->count_area[0];
1969  } else {
1970  if (private->count_area[3].record == 1)
1971  dev_warn(&device->cdev->dev,
1972  "Track 0 has no records following the VTOC\n");
1973  }
1974 
1975  if (count_area != NULL && count_area->kl == 0) {
1976  /* we found notthing violating our disk layout */
1977  if (dasd_check_blocksize(count_area->dl) == 0)
1978  block->bp_block = count_area->dl;
1979  }
1980  if (block->bp_block == 0) {
1981  dev_warn(&device->cdev->dev,
1982  "The disk layout of the DASD is not supported\n");
1983  return -EMEDIUMTYPE;
1984  }
1985  block->s2b_shift = 0; /* bits to shift 512 to get a block */
1986  for (sb = 512; sb < block->bp_block; sb = sb << 1)
1987  block->s2b_shift++;
1988 
1989  blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1990 
1991 raw:
1992  block->blocks = (private->real_cyl *
1993  private->rdc_data.trk_per_cyl *
1994  blk_per_trk);
1995 
1996  dev_info(&device->cdev->dev,
1997  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1998  "%s\n", (block->bp_block >> 10),
1999  ((private->real_cyl *
2000  private->rdc_data.trk_per_cyl *
2001  blk_per_trk * (block->bp_block >> 9)) >> 1),
2002  ((blk_per_trk * block->bp_block) >> 10),
2003  private->uses_cdl ?
2004  "compatible disk layout" : "linux disk layout");
2005 
2006  return 0;
2007 }
2008 
2009 static int dasd_eckd_do_analysis(struct dasd_block *block)
2010 {
2011  struct dasd_eckd_private *private;
2012 
2013  private = (struct dasd_eckd_private *) block->base->private;
2014  if (private->init_cqr_status < 0)
2015  return dasd_eckd_start_analysis(block);
2016  else
2017  return dasd_eckd_end_analysis(block);
2018 }
2019 
2020 static int dasd_eckd_ready_to_online(struct dasd_device *device)
2021 {
2022  return dasd_alias_add_device(device);
2023 };
2024 
2025 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2026 {
2027  cancel_work_sync(&device->reload_device);
2028  cancel_work_sync(&device->kick_validate);
2029  return dasd_alias_remove_device(device);
2030 };
2031 
2032 static int
2033 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2034 {
2035  struct dasd_eckd_private *private;
2036 
2037  private = (struct dasd_eckd_private *) block->base->private;
2038  if (dasd_check_blocksize(block->bp_block) == 0) {
2039  geo->sectors = recs_per_track(&private->rdc_data,
2040  0, block->bp_block);
2041  }
2042  geo->cylinders = private->rdc_data.no_cyl;
2043  geo->heads = private->rdc_data.trk_per_cyl;
2044  return 0;
2045 }
2046 
2047 static struct dasd_ccw_req *
2048 dasd_eckd_format_device(struct dasd_device * device,
2049  struct format_data_t * fdata)
2050 {
2051  struct dasd_eckd_private *private;
2052  struct dasd_ccw_req *fcp;
2053  struct eckd_count *ect;
2054  struct ccw1 *ccw;
2055  void *data;
2056  int rpt;
2057  struct ch_t address;
2058  int cplength, datasize;
2059  int i;
2060  int intensity = 0;
2061  int r0_perm;
2062 
2063  private = (struct dasd_eckd_private *) device->private;
2064  rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
2065  set_ch_t(&address,
2066  fdata->start_unit / private->rdc_data.trk_per_cyl,
2067  fdata->start_unit % private->rdc_data.trk_per_cyl);
2068 
2069  /* Sanity checks. */
2070  if (fdata->start_unit >=
2071  (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2072  dev_warn(&device->cdev->dev, "Start track number %d used in "
2073  "formatting is too big\n", fdata->start_unit);
2074  return ERR_PTR(-EINVAL);
2075  }
2076  if (fdata->start_unit > fdata->stop_unit) {
2077  dev_warn(&device->cdev->dev, "Start track %d used in "
2078  "formatting exceeds end track\n", fdata->start_unit);
2079  return ERR_PTR(-EINVAL);
2080  }
2081  if (dasd_check_blocksize(fdata->blksize) != 0) {
2082  dev_warn(&device->cdev->dev,
2083  "The DASD cannot be formatted with block size %d\n",
2084  fdata->blksize);
2085  return ERR_PTR(-EINVAL);
2086  }
2087 
2088  /*
2089  * fdata->intensity is a bit string that tells us what to do:
2090  * Bit 0: write record zero
2091  * Bit 1: write home address, currently not supported
2092  * Bit 2: invalidate tracks
2093  * Bit 3: use OS/390 compatible disk layout (cdl)
2094  * Bit 4: do not allow storage subsystem to modify record zero
2095  * Only some bit combinations do make sense.
2096  */
2097  if (fdata->intensity & 0x10) {
2098  r0_perm = 0;
2099  intensity = fdata->intensity & ~0x10;
2100  } else {
2101  r0_perm = 1;
2102  intensity = fdata->intensity;
2103  }
2104  switch (intensity) {
2105  case 0x00: /* Normal format */
2106  case 0x08: /* Normal format, use cdl. */
2107  cplength = 2 + rpt;
2108  datasize = sizeof(struct DE_eckd_data) +
2109  sizeof(struct LO_eckd_data) +
2110  rpt * sizeof(struct eckd_count);
2111  break;
2112  case 0x01: /* Write record zero and format track. */
2113  case 0x09: /* Write record zero and format track, use cdl. */
2114  cplength = 3 + rpt;
2115  datasize = sizeof(struct DE_eckd_data) +
2116  sizeof(struct LO_eckd_data) +
2117  sizeof(struct eckd_count) +
2118  rpt * sizeof(struct eckd_count);
2119  break;
2120  case 0x04: /* Invalidate track. */
2121  case 0x0c: /* Invalidate track, use cdl. */
2122  cplength = 3;
2123  datasize = sizeof(struct DE_eckd_data) +
2124  sizeof(struct LO_eckd_data) +
2125  sizeof(struct eckd_count);
2126  break;
2127  default:
2128  dev_warn(&device->cdev->dev, "An I/O control call used "
2129  "incorrect flags 0x%x\n", fdata->intensity);
2130  return ERR_PTR(-EINVAL);
2131  }
2132  /* Allocate the format ccw request. */
2133  fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
2134  if (IS_ERR(fcp))
2135  return fcp;
2136 
2137  data = fcp->data;
2138  ccw = fcp->cpaddr;
2139 
2140  switch (intensity & ~0x08) {
2141  case 0x00: /* Normal format. */
2142  define_extent(ccw++, (struct DE_eckd_data *) data,
2143  fdata->start_unit, fdata->start_unit,
2144  DASD_ECKD_CCW_WRITE_CKD, device);
2145  /* grant subsystem permission to format R0 */
2146  if (r0_perm)
2147  ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
2148  data += sizeof(struct DE_eckd_data);
2149  ccw[-1].flags |= CCW_FLAG_CC;
2150  locate_record(ccw++, (struct LO_eckd_data *) data,
2151  fdata->start_unit, 0, rpt,
2152  DASD_ECKD_CCW_WRITE_CKD, device,
2153  fdata->blksize);
2154  data += sizeof(struct LO_eckd_data);
2155  break;
2156  case 0x01: /* Write record zero + format track. */
2157  define_extent(ccw++, (struct DE_eckd_data *) data,
2158  fdata->start_unit, fdata->start_unit,
2159  DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2160  device);
2161  data += sizeof(struct DE_eckd_data);
2162  ccw[-1].flags |= CCW_FLAG_CC;
2163  locate_record(ccw++, (struct LO_eckd_data *) data,
2164  fdata->start_unit, 0, rpt + 1,
2165  DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
2166  device->block->bp_block);
2167  data += sizeof(struct LO_eckd_data);
2168  break;
2169  case 0x04: /* Invalidate track. */
2170  define_extent(ccw++, (struct DE_eckd_data *) data,
2171  fdata->start_unit, fdata->start_unit,
2172  DASD_ECKD_CCW_WRITE_CKD, device);
2173  data += sizeof(struct DE_eckd_data);
2174  ccw[-1].flags |= CCW_FLAG_CC;
2175  locate_record(ccw++, (struct LO_eckd_data *) data,
2176  fdata->start_unit, 0, 1,
2177  DASD_ECKD_CCW_WRITE_CKD, device, 8);
2178  data += sizeof(struct LO_eckd_data);
2179  break;
2180  }
2181  if (intensity & 0x01) { /* write record zero */
2182  ect = (struct eckd_count *) data;
2183  data += sizeof(struct eckd_count);
2184  ect->cyl = address.cyl;
2185  ect->head = address.head;
2186  ect->record = 0;
2187  ect->kl = 0;
2188  ect->dl = 8;
2189  ccw[-1].flags |= CCW_FLAG_CC;
2190  ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2191  ccw->flags = CCW_FLAG_SLI;
2192  ccw->count = 8;
2193  ccw->cda = (__u32)(addr_t) ect;
2194  ccw++;
2195  }
2196  if ((intensity & ~0x08) & 0x04) { /* erase track */
2197  ect = (struct eckd_count *) data;
2198  data += sizeof(struct eckd_count);
2199  ect->cyl = address.cyl;
2200  ect->head = address.head;
2201  ect->record = 1;
2202  ect->kl = 0;
2203  ect->dl = 0;
2204  ccw[-1].flags |= CCW_FLAG_CC;
2205  ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2206  ccw->flags = CCW_FLAG_SLI;
2207  ccw->count = 8;
2208  ccw->cda = (__u32)(addr_t) ect;
2209  } else { /* write remaining records */
2210  for (i = 0; i < rpt; i++) {
2211  ect = (struct eckd_count *) data;
2212  data += sizeof(struct eckd_count);
2213  ect->cyl = address.cyl;
2214  ect->head = address.head;
2215  ect->record = i + 1;
2216  ect->kl = 0;
2217  ect->dl = fdata->blksize;
2218  /* Check for special tracks 0-1 when formatting CDL */
2219  if ((intensity & 0x08) &&
2220  fdata->start_unit == 0) {
2221  if (i < 3) {
2222  ect->kl = 4;
2223  ect->dl = sizes_trk0[i] - 4;
2224  }
2225  }
2226  if ((intensity & 0x08) &&
2227  fdata->start_unit == 1) {
2228  ect->kl = 44;
2229  ect->dl = LABEL_SIZE - 44;
2230  }
2231  ccw[-1].flags |= CCW_FLAG_CC;
2232  ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2233  ccw->flags = CCW_FLAG_SLI;
2234  ccw->count = 8;
2235  ccw->cda = (__u32)(addr_t) ect;
2236  ccw++;
2237  }
2238  }
2239  fcp->startdev = device;
2240  fcp->memdev = device;
2241  fcp->retries = 256;
2242  fcp->buildclk = get_clock();
2243  fcp->status = DASD_CQR_FILLED;
2244  return fcp;
2245 }
2246 
2247 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2248 {
2249  cqr->status = DASD_CQR_FILLED;
2250  if (cqr->block && (cqr->startdev != cqr->block->base)) {
2251  dasd_eckd_reset_ccw_to_base_io(cqr);
2252  cqr->startdev = cqr->block->base;
2253  cqr->lpm = cqr->block->base->path_data.opm;
2254  }
2255 };
2256 
2257 static dasd_erp_fn_t
2258 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2259 {
2260  struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2261  struct ccw_device *cdev = device->cdev;
2262 
2263  switch (cdev->id.cu_type) {
2264  case 0x3990:
2265  case 0x2105:
2266  case 0x2107:
2267  case 0x1750:
2268  return dasd_3990_erp_action;
2269  case 0x9343:
2270  case 0x3880:
2271  default:
2272  return dasd_default_erp_action;
2273  }
2274 }
2275 
2276 static dasd_erp_fn_t
2277 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2278 {
2279  return dasd_default_erp_postaction;
2280 }
2281 
2282 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2283  struct dasd_ccw_req *cqr,
2284  struct irb *irb)
2285 {
2286  char mask;
2287  char *sense = NULL;
2288  struct dasd_eckd_private *private;
2289 
2290  private = (struct dasd_eckd_private *) device->private;
2291  /* first of all check for state change pending interrupt */
2292  mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2293  if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2294  /*
2295  * for alias only, not in offline processing
2296  * and only if not suspended
2297  */
2298  if (!device->block && private->lcu &&
2299  device->state == DASD_STATE_ONLINE &&
2300  !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2301  !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2302  /*
2303  * the state change could be caused by an alias
2304  * reassignment remove device from alias handling
2305  * to prevent new requests from being scheduled on
2306  * the wrong alias device
2307  */
2308  dasd_alias_remove_device(device);
2309 
2310  /* schedule worker to reload device */
2311  dasd_reload_device(device);
2312  }
2313  dasd_generic_handle_state_change(device);
2314  return;
2315  }
2316 
2317  sense = dasd_get_sense(irb);
2318  if (!sense)
2319  return;
2320 
2321  /* summary unit check */
2322  if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2323  (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2324  dasd_alias_handle_summary_unit_check(device, irb);
2325  return;
2326  }
2327 
2328  /* service information message SIM */
2329  if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2330  ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2331  dasd_3990_erp_handle_sim(device, sense);
2332  return;
2333  }
2334 
2335  /* loss of device reservation is handled via base devices only
2336  * as alias devices may be used with several bases
2337  */
2338  if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2339  (sense[7] == 0x3F) &&
2340  (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2341  test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2342  if (device->features & DASD_FEATURE_FAILONSLCK)
2343  set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2344  clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2345  dev_err(&device->cdev->dev,
2346  "The device reservation was lost\n");
2347  }
2348 }
2349 
2350 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2351  struct dasd_device *startdev,
2352  struct dasd_block *block,
2353  struct request *req,
2354  sector_t first_rec,
2355  sector_t last_rec,
2356  sector_t first_trk,
2357  sector_t last_trk,
2358  unsigned int first_offs,
2359  unsigned int last_offs,
2360  unsigned int blk_per_trk,
2361  unsigned int blksize)
2362 {
2363  struct dasd_eckd_private *private;
2364  unsigned long *idaws;
2365  struct LO_eckd_data *LO_data;
2366  struct dasd_ccw_req *cqr;
2367  struct ccw1 *ccw;
2368  struct req_iterator iter;
2369  struct bio_vec *bv;
2370  char *dst;
2371  unsigned int off;
2372  int count, cidaw, cplength, datasize;
2373  sector_t recid;
2374  unsigned char cmd, rcmd;
2375  int use_prefix;
2376  struct dasd_device *basedev;
2377 
2378  basedev = block->base;
2379  private = (struct dasd_eckd_private *) basedev->private;
2380  if (rq_data_dir(req) == READ)
2381  cmd = DASD_ECKD_CCW_READ_MT;
2382  else if (rq_data_dir(req) == WRITE)
2383  cmd = DASD_ECKD_CCW_WRITE_MT;
2384  else
2385  return ERR_PTR(-EINVAL);
2386 
2387  /* Check struct bio and count the number of blocks for the request. */
2388  count = 0;
2389  cidaw = 0;
2390  rq_for_each_segment(bv, req, iter) {
2391  if (bv->bv_len & (blksize - 1))
2392  /* Eckd can only do full blocks. */
2393  return ERR_PTR(-EINVAL);
2394  count += bv->bv_len >> (block->s2b_shift + 9);
2395 #if defined(CONFIG_64BIT)
2396  if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2397  cidaw += bv->bv_len >> (block->s2b_shift + 9);
2398 #endif
2399  }
2400  /* Paranoia. */
2401  if (count != last_rec - first_rec + 1)
2402  return ERR_PTR(-EINVAL);
2403 
2404  /* use the prefix command if available */
2405  use_prefix = private->features.feature[8] & 0x01;
2406  if (use_prefix) {
2407  /* 1x prefix + number of blocks */
2408  cplength = 2 + count;
2409  /* 1x prefix + cidaws*sizeof(long) */
2410  datasize = sizeof(struct PFX_eckd_data) +
2411  sizeof(struct LO_eckd_data) +
2412  cidaw * sizeof(unsigned long);
2413  } else {
2414  /* 1x define extent + 1x locate record + number of blocks */
2415  cplength = 2 + count;
2416  /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2417  datasize = sizeof(struct DE_eckd_data) +
2418  sizeof(struct LO_eckd_data) +
2419  cidaw * sizeof(unsigned long);
2420  }
2421  /* Find out the number of additional locate record ccws for cdl. */
2422  if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2423  if (last_rec >= 2*blk_per_trk)
2424  count = 2*blk_per_trk - first_rec;
2425  cplength += count;
2426  datasize += count*sizeof(struct LO_eckd_data);
2427  }
2428  /* Allocate the ccw request. */
2429  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2430  startdev);
2431  if (IS_ERR(cqr))
2432  return cqr;
2433  ccw = cqr->cpaddr;
2434  /* First ccw is define extent or prefix. */
2435  if (use_prefix) {
2436  if (prefix(ccw++, cqr->data, first_trk,
2437  last_trk, cmd, basedev, startdev) == -EAGAIN) {
2438  /* Clock not in sync and XRC is enabled.
2439  * Try again later.
2440  */
2441  dasd_sfree_request(cqr, startdev);
2442  return ERR_PTR(-EAGAIN);
2443  }
2444  idaws = (unsigned long *) (cqr->data +
2445  sizeof(struct PFX_eckd_data));
2446  } else {
2447  if (define_extent(ccw++, cqr->data, first_trk,
2448  last_trk, cmd, basedev) == -EAGAIN) {
2449  /* Clock not in sync and XRC is enabled.
2450  * Try again later.
2451  */
2452  dasd_sfree_request(cqr, startdev);
2453  return ERR_PTR(-EAGAIN);
2454  }
2455  idaws = (unsigned long *) (cqr->data +
2456  sizeof(struct DE_eckd_data));
2457  }
2458  /* Build locate_record+read/write/ccws. */
2459  LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2460  recid = first_rec;
2461  if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2462  /* Only standard blocks so there is just one locate record. */
2463  ccw[-1].flags |= CCW_FLAG_CC;
2464  locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2465  last_rec - recid + 1, cmd, basedev, blksize);
2466  }
2467  rq_for_each_segment(bv, req, iter) {
2468  dst = page_address(bv->bv_page) + bv->bv_offset;
2469  if (dasd_page_cache) {
2470  char *copy = kmem_cache_alloc(dasd_page_cache,
2471  GFP_DMA | __GFP_NOWARN);
2472  if (copy && rq_data_dir(req) == WRITE)
2473  memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2474  if (copy)
2475  dst = copy + bv->bv_offset;
2476  }
2477  for (off = 0; off < bv->bv_len; off += blksize) {
2478  sector_t trkid = recid;
2479  unsigned int recoffs = sector_div(trkid, blk_per_trk);
2480  rcmd = cmd;
2481  count = blksize;
2482  /* Locate record for cdl special block ? */
2483  if (private->uses_cdl && recid < 2*blk_per_trk) {
2484  if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2485  rcmd |= 0x8;
2486  count = dasd_eckd_cdl_reclen(recid);
2487  if (count < blksize &&
2488  rq_data_dir(req) == READ)
2489  memset(dst + count, 0xe5,
2490  blksize - count);
2491  }
2492  ccw[-1].flags |= CCW_FLAG_CC;
2493  locate_record(ccw++, LO_data++,
2494  trkid, recoffs + 1,
2495  1, rcmd, basedev, count);
2496  }
2497  /* Locate record for standard blocks ? */
2498  if (private->uses_cdl && recid == 2*blk_per_trk) {
2499  ccw[-1].flags |= CCW_FLAG_CC;
2500  locate_record(ccw++, LO_data++,
2501  trkid, recoffs + 1,
2502  last_rec - recid + 1,
2503  cmd, basedev, count);
2504  }
2505  /* Read/write ccw. */
2506  ccw[-1].flags |= CCW_FLAG_CC;
2507  ccw->cmd_code = rcmd;
2508  ccw->count = count;
2509  if (idal_is_needed(dst, blksize)) {
2510  ccw->cda = (__u32)(addr_t) idaws;
2511  ccw->flags = CCW_FLAG_IDA;
2512  idaws = idal_create_words(idaws, dst, blksize);
2513  } else {
2514  ccw->cda = (__u32)(addr_t) dst;
2515  ccw->flags = 0;
2516  }
2517  ccw++;
2518  dst += blksize;
2519  recid++;
2520  }
2521  }
2522  if (blk_noretry_request(req) ||
2523  block->base->features & DASD_FEATURE_FAILFAST)
2524  set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2525  cqr->startdev = startdev;
2526  cqr->memdev = startdev;
2527  cqr->block = block;
2528  cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2529  cqr->lpm = startdev->path_data.ppm;
2530  cqr->retries = 256;
2531  cqr->buildclk = get_clock();
2532  cqr->status = DASD_CQR_FILLED;
2533  return cqr;
2534 }
2535 
2536 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2537  struct dasd_device *startdev,
2538  struct dasd_block *block,
2539  struct request *req,
2540  sector_t first_rec,
2541  sector_t last_rec,
2542  sector_t first_trk,
2543  sector_t last_trk,
2544  unsigned int first_offs,
2545  unsigned int last_offs,
2546  unsigned int blk_per_trk,
2547  unsigned int blksize)
2548 {
2549  unsigned long *idaws;
2550  struct dasd_ccw_req *cqr;
2551  struct ccw1 *ccw;
2552  struct req_iterator iter;
2553  struct bio_vec *bv;
2554  char *dst, *idaw_dst;
2555  unsigned int cidaw, cplength, datasize;
2556  unsigned int tlf;
2557  sector_t recid;
2558  unsigned char cmd;
2559  struct dasd_device *basedev;
2560  unsigned int trkcount, count, count_to_trk_end;
2561  unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2562  unsigned char new_track, end_idaw;
2563  sector_t trkid;
2564  unsigned int recoffs;
2565 
2566  basedev = block->base;
2567  if (rq_data_dir(req) == READ)
2568  cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2569  else if (rq_data_dir(req) == WRITE)
2570  cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2571  else
2572  return ERR_PTR(-EINVAL);
2573 
2574  /* Track based I/O needs IDAWs for each page, and not just for
2575  * 64 bit addresses. We need additional idals for pages
2576  * that get filled from two tracks, so we use the number
2577  * of records as upper limit.
2578  */
2579  cidaw = last_rec - first_rec + 1;
2580  trkcount = last_trk - first_trk + 1;
2581 
2582  /* 1x prefix + one read/write ccw per track */
2583  cplength = 1 + trkcount;
2584 
2585  /* on 31-bit we need space for two 32 bit addresses per page
2586  * on 64-bit one 64 bit address
2587  */
2588  datasize = sizeof(struct PFX_eckd_data) +
2589  cidaw * sizeof(unsigned long long);
2590 
2591  /* Allocate the ccw request. */
2592  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2593  startdev);
2594  if (IS_ERR(cqr))
2595  return cqr;
2596  ccw = cqr->cpaddr;
2597  /* transfer length factor: how many bytes to read from the last track */
2598  if (first_trk == last_trk)
2599  tlf = last_offs - first_offs + 1;
2600  else
2601  tlf = last_offs + 1;
2602  tlf *= blksize;
2603 
2604  if (prefix_LRE(ccw++, cqr->data, first_trk,
2605  last_trk, cmd, basedev, startdev,
2606  1 /* format */, first_offs + 1,
2607  trkcount, blksize,
2608  tlf) == -EAGAIN) {
2609  /* Clock not in sync and XRC is enabled.
2610  * Try again later.
2611  */
2612  dasd_sfree_request(cqr, startdev);
2613  return ERR_PTR(-EAGAIN);
2614  }
2615 
2616  /*
2617  * The translation of request into ccw programs must meet the
2618  * following conditions:
2619  * - all idaws but the first and the last must address full pages
2620  * (or 2K blocks on 31-bit)
2621  * - the scope of a ccw and it's idal ends with the track boundaries
2622  */
2623  idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2624  recid = first_rec;
2625  new_track = 1;
2626  end_idaw = 0;
2627  len_to_track_end = 0;
2628  idaw_dst = NULL;
2629  idaw_len = 0;
2630  rq_for_each_segment(bv, req, iter) {
2631  dst = page_address(bv->bv_page) + bv->bv_offset;
2632  seg_len = bv->bv_len;
2633  while (seg_len) {
2634  if (new_track) {
2635  trkid = recid;
2636  recoffs = sector_div(trkid, blk_per_trk);
2637  count_to_trk_end = blk_per_trk - recoffs;
2638  count = min((last_rec - recid + 1),
2639  (sector_t)count_to_trk_end);
2640  len_to_track_end = count * blksize;
2641  ccw[-1].flags |= CCW_FLAG_CC;
2642  ccw->cmd_code = cmd;
2643  ccw->count = len_to_track_end;
2644  ccw->cda = (__u32)(addr_t)idaws;
2645  ccw->flags = CCW_FLAG_IDA;
2646  ccw++;
2647  recid += count;
2648  new_track = 0;
2649  /* first idaw for a ccw may start anywhere */
2650  if (!idaw_dst)
2651  idaw_dst = dst;
2652  }
2653  /* If we start a new idaw, we must make sure that it
2654  * starts on an IDA_BLOCK_SIZE boundary.
2655  * If we continue an idaw, we must make sure that the
2656  * current segment begins where the so far accumulated
2657  * idaw ends
2658  */
2659  if (!idaw_dst) {
2660  if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2661  dasd_sfree_request(cqr, startdev);
2662  return ERR_PTR(-ERANGE);
2663  } else
2664  idaw_dst = dst;
2665  }
2666  if ((idaw_dst + idaw_len) != dst) {
2667  dasd_sfree_request(cqr, startdev);
2668  return ERR_PTR(-ERANGE);
2669  }
2670  part_len = min(seg_len, len_to_track_end);
2671  seg_len -= part_len;
2672  dst += part_len;
2673  idaw_len += part_len;
2674  len_to_track_end -= part_len;
2675  /* collected memory area ends on an IDA_BLOCK border,
2676  * -> create an idaw
2677  * idal_create_words will handle cases where idaw_len
2678  * is larger then IDA_BLOCK_SIZE
2679  */
2680  if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2681  end_idaw = 1;
2682  /* We also need to end the idaw at track end */
2683  if (!len_to_track_end) {
2684  new_track = 1;
2685  end_idaw = 1;
2686  }
2687  if (end_idaw) {
2688  idaws = idal_create_words(idaws, idaw_dst,
2689  idaw_len);
2690  idaw_dst = NULL;
2691  idaw_len = 0;
2692  end_idaw = 0;
2693  }
2694  }
2695  }
2696 
2697  if (blk_noretry_request(req) ||
2698  block->base->features & DASD_FEATURE_FAILFAST)
2699  set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2700  cqr->startdev = startdev;
2701  cqr->memdev = startdev;
2702  cqr->block = block;
2703  cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2704  cqr->lpm = startdev->path_data.ppm;
2705  cqr->retries = 256;
2706  cqr->buildclk = get_clock();
2707  cqr->status = DASD_CQR_FILLED;
2708  return cqr;
2709 }
2710 
2711 static int prepare_itcw(struct itcw *itcw,
2712  unsigned int trk, unsigned int totrk, int cmd,
2713  struct dasd_device *basedev,
2714  struct dasd_device *startdev,
2715  unsigned int rec_on_trk, int count,
2716  unsigned int blksize,
2717  unsigned int total_data_size,
2718  unsigned int tlf,
2719  unsigned int blk_per_trk)
2720 {
2721  struct PFX_eckd_data pfxdata;
2722  struct dasd_eckd_private *basepriv, *startpriv;
2723  struct DE_eckd_data *dedata;
2724  struct LRE_eckd_data *lredata;
2725  struct dcw *dcw;
2726 
2727  u32 begcyl, endcyl;
2728  u16 heads, beghead, endhead;
2729  u8 pfx_cmd;
2730 
2731  int rc = 0;
2732  int sector = 0;
2733  int dn, d;
2734 
2735 
2736  /* setup prefix data */
2737  basepriv = (struct dasd_eckd_private *) basedev->private;
2738  startpriv = (struct dasd_eckd_private *) startdev->private;
2739  dedata = &pfxdata.define_extent;
2740  lredata = &pfxdata.locate_record;
2741 
2742  memset(&pfxdata, 0, sizeof(pfxdata));
2743  pfxdata.format = 1; /* PFX with LRE */
2744  pfxdata.base_address = basepriv->ned->unit_addr;
2745  pfxdata.base_lss = basepriv->ned->ID;
2746  pfxdata.validity.define_extent = 1;
2747 
2748  /* private uid is kept up to date, conf_data may be outdated */
2749  if (startpriv->uid.type != UA_BASE_DEVICE) {
2750  pfxdata.validity.verify_base = 1;
2751  if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2752  pfxdata.validity.hyper_pav = 1;
2753  }
2754 
2755  switch (cmd) {
2756  case DASD_ECKD_CCW_READ_TRACK_DATA:
2757  dedata->mask.perm = 0x1;
2758  dedata->attributes.operation = basepriv->attrib.operation;
2759  dedata->blk_size = blksize;
2760  dedata->ga_extended |= 0x42;
2761  lredata->operation.orientation = 0x0;
2762  lredata->operation.operation = 0x0C;
2763  lredata->auxiliary.check_bytes = 0x01;
2764  pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2765  break;
2766  case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2767  dedata->mask.perm = 0x02;
2768  dedata->attributes.operation = basepriv->attrib.operation;
2769  dedata->blk_size = blksize;
2770  rc = check_XRC_on_prefix(&pfxdata, basedev);
2771  dedata->ga_extended |= 0x42;
2772  lredata->operation.orientation = 0x0;
2773  lredata->operation.operation = 0x3F;
2774  lredata->extended_operation = 0x23;
2775  lredata->auxiliary.check_bytes = 0x2;
2776  pfx_cmd = DASD_ECKD_CCW_PFX;
2777  break;
2778  default:
2779  DBF_DEV_EVENT(DBF_ERR, basedev,
2780  "prepare itcw, unknown opcode 0x%x", cmd);
2781  BUG();
2782  break;
2783  }
2784  if (rc)
2785  return rc;
2786 
2787  dedata->attributes.mode = 0x3; /* ECKD */
2788 
2789  heads = basepriv->rdc_data.trk_per_cyl;
2790  begcyl = trk / heads;
2791  beghead = trk % heads;
2792  endcyl = totrk / heads;
2793  endhead = totrk % heads;
2794 
2795  /* check for sequential prestage - enhance cylinder range */
2796  if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2797  dedata->attributes.operation == DASD_SEQ_ACCESS) {
2798 
2799  if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2800  endcyl += basepriv->attrib.nr_cyl;
2801  else
2802  endcyl = (basepriv->real_cyl - 1);
2803  }
2804 
2805  set_ch_t(&dedata->beg_ext, begcyl, beghead);
2806  set_ch_t(&dedata->end_ext, endcyl, endhead);
2807 
2808  dedata->ep_format = 0x20; /* records per track is valid */
2809  dedata->ep_rec_per_track = blk_per_trk;
2810 
2811  if (rec_on_trk) {
2812  switch (basepriv->rdc_data.dev_type) {
2813  case 0x3390:
2814  dn = ceil_quot(blksize + 6, 232);
2815  d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2816  sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2817  break;
2818  case 0x3380:
2819  d = 7 + ceil_quot(blksize + 12, 32);
2820  sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2821  break;
2822  }
2823  }
2824 
2825  lredata->auxiliary.length_valid = 1;
2826  lredata->auxiliary.length_scope = 1;
2827  lredata->auxiliary.imbedded_ccw_valid = 1;
2828  lredata->length = tlf;
2829  lredata->imbedded_ccw = cmd;
2830  lredata->count = count;
2831  lredata->sector = sector;
2832  set_ch_t(&lredata->seek_addr, begcyl, beghead);
2833  lredata->search_arg.cyl = lredata->seek_addr.cyl;
2834  lredata->search_arg.head = lredata->seek_addr.head;
2835  lredata->search_arg.record = rec_on_trk;
2836 
2837  dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2838  &pfxdata, sizeof(pfxdata), total_data_size);
2839  return IS_ERR(dcw) ? PTR_ERR(dcw) : 0;
2840 }
2841 
2842 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2843  struct dasd_device *startdev,
2844  struct dasd_block *block,
2845  struct request *req,
2846  sector_t first_rec,
2847  sector_t last_rec,
2848  sector_t first_trk,
2849  sector_t last_trk,
2850  unsigned int first_offs,
2851  unsigned int last_offs,
2852  unsigned int blk_per_trk,
2853  unsigned int blksize)
2854 {
2855  struct dasd_ccw_req *cqr;
2856  struct req_iterator iter;
2857  struct bio_vec *bv;
2858  char *dst;
2859  unsigned int trkcount, ctidaw;
2860  unsigned char cmd;
2861  struct dasd_device *basedev;
2862  unsigned int tlf;
2863  struct itcw *itcw;
2864  struct tidaw *last_tidaw = NULL;
2865  int itcw_op;
2866  size_t itcw_size;
2867  u8 tidaw_flags;
2868  unsigned int seg_len, part_len, len_to_track_end;
2869  unsigned char new_track;
2870  sector_t recid, trkid;
2871  unsigned int offs;
2872  unsigned int count, count_to_trk_end;
2873  int ret;
2874 
2875  basedev = block->base;
2876  if (rq_data_dir(req) == READ) {
2877  cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2878  itcw_op = ITCW_OP_READ;
2879  } else if (rq_data_dir(req) == WRITE) {
2880  cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2881  itcw_op = ITCW_OP_WRITE;
2882  } else
2883  return ERR_PTR(-EINVAL);
2884 
2885  /* trackbased I/O needs address all memory via TIDAWs,
2886  * not just for 64 bit addresses. This allows us to map
2887  * each segment directly to one tidaw.
2888  * In the case of write requests, additional tidaws may
2889  * be needed when a segment crosses a track boundary.
2890  */
2891  trkcount = last_trk - first_trk + 1;
2892  ctidaw = 0;
2893  rq_for_each_segment(bv, req, iter) {
2894  ++ctidaw;
2895  }
2896  if (rq_data_dir(req) == WRITE)
2897  ctidaw += (last_trk - first_trk);
2898 
2899  /* Allocate the ccw request. */
2900  itcw_size = itcw_calc_size(0, ctidaw, 0);
2901  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2902  if (IS_ERR(cqr))
2903  return cqr;
2904 
2905  /* transfer length factor: how many bytes to read from the last track */
2906  if (first_trk == last_trk)
2907  tlf = last_offs - first_offs + 1;
2908  else
2909  tlf = last_offs + 1;
2910  tlf *= blksize;
2911 
2912  itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2913  if (IS_ERR(itcw)) {
2914  ret = -EINVAL;
2915  goto out_error;
2916  }
2917  cqr->cpaddr = itcw_get_tcw(itcw);
2918  if (prepare_itcw(itcw, first_trk, last_trk,
2919  cmd, basedev, startdev,
2920  first_offs + 1,
2921  trkcount, blksize,
2922  (last_rec - first_rec + 1) * blksize,
2923  tlf, blk_per_trk) == -EAGAIN) {
2924  /* Clock not in sync and XRC is enabled.
2925  * Try again later.
2926  */
2927  ret = -EAGAIN;
2928  goto out_error;
2929  }
2930  len_to_track_end = 0;
2931  /*
2932  * A tidaw can address 4k of memory, but must not cross page boundaries
2933  * We can let the block layer handle this by setting
2934  * blk_queue_segment_boundary to page boundaries and
2935  * blk_max_segment_size to page size when setting up the request queue.
2936  * For write requests, a TIDAW must not cross track boundaries, because
2937  * we have to set the CBC flag on the last tidaw for each track.
2938  */
2939  if (rq_data_dir(req) == WRITE) {
2940  new_track = 1;
2941  recid = first_rec;
2942  rq_for_each_segment(bv, req, iter) {
2943  dst = page_address(bv->bv_page) + bv->bv_offset;
2944  seg_len = bv->bv_len;
2945  while (seg_len) {
2946  if (new_track) {
2947  trkid = recid;
2948  offs = sector_div(trkid, blk_per_trk);
2949  count_to_trk_end = blk_per_trk - offs;
2950  count = min((last_rec - recid + 1),
2951  (sector_t)count_to_trk_end);
2952  len_to_track_end = count * blksize;
2953  recid += count;
2954  new_track = 0;
2955  }
2956  part_len = min(seg_len, len_to_track_end);
2957  seg_len -= part_len;
2958  len_to_track_end -= part_len;
2959  /* We need to end the tidaw at track end */
2960  if (!len_to_track_end) {
2961  new_track = 1;
2962  tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
2963  } else
2964  tidaw_flags = 0;
2965  last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
2966  dst, part_len);
2967  if (IS_ERR(last_tidaw)) {
2968  ret = -EINVAL;
2969  goto out_error;
2970  }
2971  dst += part_len;
2972  }
2973  }
2974  } else {
2975  rq_for_each_segment(bv, req, iter) {
2976  dst = page_address(bv->bv_page) + bv->bv_offset;
2977  last_tidaw = itcw_add_tidaw(itcw, 0x00,
2978  dst, bv->bv_len);
2979  if (IS_ERR(last_tidaw)) {
2980  ret = -EINVAL;
2981  goto out_error;
2982  }
2983  }
2984  }
2985  last_tidaw->flags |= TIDAW_FLAGS_LAST;
2986  last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
2987  itcw_finalize(itcw);
2988 
2989  if (blk_noretry_request(req) ||
2990  block->base->features & DASD_FEATURE_FAILFAST)
2991  set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2992  cqr->cpmode = 1;
2993  cqr->startdev = startdev;
2994  cqr->memdev = startdev;
2995  cqr->block = block;
2996  cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2997  cqr->lpm = startdev->path_data.ppm;
2998  cqr->retries = 256;
2999  cqr->buildclk = get_clock();
3000  cqr->status = DASD_CQR_FILLED;
3001  return cqr;
3002 out_error:
3003  dasd_sfree_request(cqr, startdev);
3004  return ERR_PTR(ret);
3005 }
3006 
3007 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3008  struct dasd_block *block,
3009  struct request *req)
3010 {
3011  int cmdrtd, cmdwtd;
3012  int use_prefix;
3013  int fcx_multitrack;
3014  struct dasd_eckd_private *private;
3015  struct dasd_device *basedev;
3016  sector_t first_rec, last_rec;
3017  sector_t first_trk, last_trk;
3018  unsigned int first_offs, last_offs;
3019  unsigned int blk_per_trk, blksize;
3020  int cdlspecial;
3021  unsigned int data_size;
3022  struct dasd_ccw_req *cqr;
3023 
3024  basedev = block->base;
3025  private = (struct dasd_eckd_private *) basedev->private;
3026 
3027  /* Calculate number of blocks/records per track. */
3028  blksize = block->bp_block;
3029  blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3030  if (blk_per_trk == 0)
3031  return ERR_PTR(-EINVAL);
3032  /* Calculate record id of first and last block. */
3033  first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3034  first_offs = sector_div(first_trk, blk_per_trk);
3035  last_rec = last_trk =
3036  (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3037  last_offs = sector_div(last_trk, blk_per_trk);
3038  cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3039 
3040  fcx_multitrack = private->features.feature[40] & 0x20;
3041  data_size = blk_rq_bytes(req);
3042  /* tpm write request add CBC data on each track boundary */
3043  if (rq_data_dir(req) == WRITE)
3044  data_size += (last_trk - first_trk) * 4;
3045 
3046  /* is read track data and write track data in command mode supported? */
3047  cmdrtd = private->features.feature[9] & 0x20;
3048  cmdwtd = private->features.feature[12] & 0x40;
3049  use_prefix = private->features.feature[8] & 0x01;
3050 
3051  cqr = NULL;
3052  if (cdlspecial || dasd_page_cache) {
3053  /* do nothing, just fall through to the cmd mode single case */
3054  } else if ((data_size <= private->fcx_max_data)
3055  && (fcx_multitrack || (first_trk == last_trk))) {
3056  cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3057  first_rec, last_rec,
3058  first_trk, last_trk,
3059  first_offs, last_offs,
3060  blk_per_trk, blksize);
3061  if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3062  (PTR_ERR(cqr) != -ENOMEM))
3063  cqr = NULL;
3064  } else if (use_prefix &&
3065  (((rq_data_dir(req) == READ) && cmdrtd) ||
3066  ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3067  cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3068  first_rec, last_rec,
3069  first_trk, last_trk,
3070  first_offs, last_offs,
3071  blk_per_trk, blksize);
3072  if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3073  (PTR_ERR(cqr) != -ENOMEM))
3074  cqr = NULL;
3075  }
3076  if (!cqr)
3077  cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3078  first_rec, last_rec,
3079  first_trk, last_trk,
3080  first_offs, last_offs,
3081  blk_per_trk, blksize);
3082  return cqr;
3083 }
3084 
3085 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3086  struct dasd_block *block,
3087  struct request *req)
3088 {
3089  unsigned long *idaws;
3090  struct dasd_device *basedev;
3091  struct dasd_ccw_req *cqr;
3092  struct ccw1 *ccw;
3093  struct req_iterator iter;
3094  struct bio_vec *bv;
3095  char *dst;
3096  unsigned char cmd;
3097  unsigned int trkcount;
3098  unsigned int seg_len, len_to_track_end;
3099  unsigned int first_offs;
3100  unsigned int cidaw, cplength, datasize;
3101  sector_t first_trk, last_trk;
3102  unsigned int pfx_datasize;
3103 
3104  /*
3105  * raw track access needs to be mutiple of 64k and on 64k boundary
3106  */
3107  if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
3108  cqr = ERR_PTR(-EINVAL);
3109  goto out;
3110  }
3111  if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
3112  DASD_RAW_SECTORS_PER_TRACK) != 0) {
3113  cqr = ERR_PTR(-EINVAL);
3114  goto out;
3115  }
3116 
3117  first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3118  last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3119  DASD_RAW_SECTORS_PER_TRACK;
3120  trkcount = last_trk - first_trk + 1;
3121  first_offs = 0;
3122  basedev = block->base;
3123 
3124  if (rq_data_dir(req) == READ)
3125  cmd = DASD_ECKD_CCW_READ_TRACK;
3126  else if (rq_data_dir(req) == WRITE)
3127  cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3128  else {
3129  cqr = ERR_PTR(-EINVAL);
3130  goto out;
3131  }
3132 
3133  /*
3134  * Raw track based I/O needs IDAWs for each page,
3135  * and not just for 64 bit addresses.
3136  */
3137  cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3138 
3139  /* 1x prefix + one read/write ccw per track */
3140  cplength = 1 + trkcount;
3141 
3142  /*
3143  * struct PFX_eckd_data has up to 2 byte as extended parameter
3144  * this is needed for write full track and has to be mentioned
3145  * separately
3146  * add 8 instead of 2 to keep 8 byte boundary
3147  */
3148  pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3149 
3150  datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3151 
3152  /* Allocate the ccw request. */
3153  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3154  datasize, startdev);
3155  if (IS_ERR(cqr))
3156  goto out;
3157  ccw = cqr->cpaddr;
3158 
3159  if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3160  basedev, startdev, 1 /* format */, first_offs + 1,
3161  trkcount, 0, 0) == -EAGAIN) {
3162  /* Clock not in sync and XRC is enabled.
3163  * Try again later.
3164  */
3165  dasd_sfree_request(cqr, startdev);
3166  cqr = ERR_PTR(-EAGAIN);
3167  goto out;
3168  }
3169 
3170  idaws = (unsigned long *)(cqr->data + pfx_datasize);
3171 
3172  len_to_track_end = 0;
3173 
3174  rq_for_each_segment(bv, req, iter) {
3175  dst = page_address(bv->bv_page) + bv->bv_offset;
3176  seg_len = bv->bv_len;
3177  if (!len_to_track_end) {
3178  ccw[-1].flags |= CCW_FLAG_CC;
3179  ccw->cmd_code = cmd;
3180  /* maximum 3390 track size */
3181  ccw->count = 57326;
3182  /* 64k map to one track */
3183  len_to_track_end = 65536;
3184  ccw->cda = (__u32)(addr_t)idaws;
3185  ccw->flags |= CCW_FLAG_IDA;
3186  ccw->flags |= CCW_FLAG_SLI;
3187  ccw++;
3188  }
3189  len_to_track_end -= seg_len;
3190  idaws = idal_create_words(idaws, dst, seg_len);
3191  }
3192 
3193  if (blk_noretry_request(req) ||
3194  block->base->features & DASD_FEATURE_FAILFAST)
3195  set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3196  cqr->startdev = startdev;
3197  cqr->memdev = startdev;
3198  cqr->block = block;
3199  cqr->expires = startdev->default_expires * HZ;
3200  cqr->lpm = startdev->path_data.ppm;
3201  cqr->retries = 256;
3202  cqr->buildclk = get_clock();
3203  cqr->status = DASD_CQR_FILLED;
3204 
3205  if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3206  cqr = NULL;
3207 out:
3208  return cqr;
3209 }
3210 
3211 
3212 static int
3213 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3214 {
3215  struct dasd_eckd_private *private;
3216  struct ccw1 *ccw;
3217  struct req_iterator iter;
3218  struct bio_vec *bv;
3219  char *dst, *cda;
3220  unsigned int blksize, blk_per_trk, off;
3221  sector_t recid;
3222  int status;
3223 
3224  if (!dasd_page_cache)
3225  goto out;
3226  private = (struct dasd_eckd_private *) cqr->block->base->private;
3227  blksize = cqr->block->bp_block;
3228  blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3229  recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3230  ccw = cqr->cpaddr;
3231  /* Skip over define extent & locate record. */
3232  ccw++;
3233  if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3234  ccw++;
3235  rq_for_each_segment(bv, req, iter) {
3236  dst = page_address(bv->bv_page) + bv->bv_offset;
3237  for (off = 0; off < bv->bv_len; off += blksize) {
3238  /* Skip locate record. */
3239  if (private->uses_cdl && recid <= 2*blk_per_trk)
3240  ccw++;
3241  if (dst) {
3242  if (ccw->flags & CCW_FLAG_IDA)
3243  cda = *((char **)((addr_t) ccw->cda));
3244  else
3245  cda = (char *)((addr_t) ccw->cda);
3246  if (dst != cda) {
3247  if (rq_data_dir(req) == READ)
3248  memcpy(dst, cda, bv->bv_len);
3249  kmem_cache_free(dasd_page_cache,
3250  (void *)((addr_t)cda & PAGE_MASK));
3251  }
3252  dst = NULL;
3253  }
3254  ccw++;
3255  recid++;
3256  }
3257  }
3258 out:
3259  status = cqr->status == DASD_CQR_DONE;
3260  dasd_sfree_request(cqr, cqr->memdev);
3261  return status;
3262 }
3263 
3264 /*
3265  * Modify ccw/tcw in cqr so it can be started on a base device.
3266  *
3267  * Note that this is not enough to restart the cqr!
3268  * Either reset cqr->startdev as well (summary unit check handling)
3269  * or restart via separate cqr (as in ERP handling).
3270  */
3271 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3272 {
3273  struct ccw1 *ccw;
3274  struct PFX_eckd_data *pfxdata;
3275  struct tcw *tcw;
3276  struct tccb *tccb;
3277  struct dcw *dcw;
3278 
3279  if (cqr->cpmode == 1) {
3280  tcw = cqr->cpaddr;
3281  tccb = tcw_get_tccb(tcw);
3282  dcw = (struct dcw *)&tccb->tca[0];
3283  pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3284  pfxdata->validity.verify_base = 0;
3285  pfxdata->validity.hyper_pav = 0;
3286  } else {
3287  ccw = cqr->cpaddr;
3288  pfxdata = cqr->data;
3289  if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3290  pfxdata->validity.verify_base = 0;
3291  pfxdata->validity.hyper_pav = 0;
3292  }
3293  }
3294 }
3295 
3296 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3297 
3298 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3299  struct dasd_block *block,
3300  struct request *req)
3301 {
3302  struct dasd_eckd_private *private;
3303  struct dasd_device *startdev;
3304  unsigned long flags;
3305  struct dasd_ccw_req *cqr;
3306 
3307  startdev = dasd_alias_get_start_dev(base);
3308  if (!startdev)
3309  startdev = base;
3310  private = (struct dasd_eckd_private *) startdev->private;
3311  if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3312  return ERR_PTR(-EBUSY);
3313 
3314  spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3315  private->count++;
3316  if ((base->features & DASD_FEATURE_USERAW))
3317  cqr = dasd_raw_build_cp(startdev, block, req);
3318  else
3319  cqr = dasd_eckd_build_cp(startdev, block, req);
3320  if (IS_ERR(cqr))
3321  private->count--;
3322  spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3323  return cqr;
3324 }
3325 
3326 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3327  struct request *req)
3328 {
3329  struct dasd_eckd_private *private;
3330  unsigned long flags;
3331 
3332  spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3333  private = (struct dasd_eckd_private *) cqr->memdev->private;
3334  private->count--;
3335  spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3336  return dasd_eckd_free_cp(cqr, req);
3337 }
3338 
3339 static int
3340 dasd_eckd_fill_info(struct dasd_device * device,
3341  struct dasd_information2_t * info)
3342 {
3343  struct dasd_eckd_private *private;
3344 
3345  private = (struct dasd_eckd_private *) device->private;
3346  info->label_block = 2;
3347  info->FBA_layout = private->uses_cdl ? 0 : 1;
3348  info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3349  info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3350  memcpy(info->characteristics, &private->rdc_data,
3351  sizeof(struct dasd_eckd_characteristics));
3352  info->confdata_size = min((unsigned long)private->conf_len,
3353  sizeof(info->configuration_data));
3354  memcpy(info->configuration_data, private->conf_data,
3355  info->confdata_size);
3356  return 0;
3357 }
3358 
3359 /*
3360  * SECTION: ioctl functions for eckd devices.
3361  */
3362 
3363 /*
3364  * Release device ioctl.
3365  * Buils a channel programm to releases a prior reserved
3366  * (see dasd_eckd_reserve) device.
3367  */
3368 static int
3369 dasd_eckd_release(struct dasd_device *device)
3370 {
3371  struct dasd_ccw_req *cqr;
3372  int rc;
3373  struct ccw1 *ccw;
3374  int useglobal;
3375 
3376  if (!capable(CAP_SYS_ADMIN))
3377  return -EACCES;
3378 
3379  useglobal = 0;
3380  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3381  if (IS_ERR(cqr)) {
3382  mutex_lock(&dasd_reserve_mutex);
3383  useglobal = 1;
3384  cqr = &dasd_reserve_req->cqr;
3385  memset(cqr, 0, sizeof(*cqr));
3386  memset(&dasd_reserve_req->ccw, 0,
3387  sizeof(dasd_reserve_req->ccw));
3388  cqr->cpaddr = &dasd_reserve_req->ccw;
3389  cqr->data = &dasd_reserve_req->data;
3390  cqr->magic = DASD_ECKD_MAGIC;
3391  }
3392  ccw = cqr->cpaddr;
3393  ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3394  ccw->flags |= CCW_FLAG_SLI;
3395  ccw->count = 32;
3396  ccw->cda = (__u32)(addr_t) cqr->data;
3397  cqr->startdev = device;
3398  cqr->memdev = device;
3399  clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3400  set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3401  cqr->retries = 2; /* set retry counter to enable basic ERP */
3402  cqr->expires = 2 * HZ;
3403  cqr->buildclk = get_clock();
3404  cqr->status = DASD_CQR_FILLED;
3405 
3406  rc = dasd_sleep_on_immediatly(cqr);
3407  if (!rc)
3408  clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3409 
3410  if (useglobal)
3411  mutex_unlock(&dasd_reserve_mutex);
3412  else
3413  dasd_sfree_request(cqr, cqr->memdev);
3414  return rc;
3415 }
3416 
3417 /*
3418  * Reserve device ioctl.
3419  * Options are set to 'synchronous wait for interrupt' and
3420  * 'timeout the request'. This leads to a terminate IO if
3421  * the interrupt is outstanding for a certain time.
3422  */
3423 static int
3424 dasd_eckd_reserve(struct dasd_device *device)
3425 {
3426  struct dasd_ccw_req *cqr;
3427  int rc;
3428  struct ccw1 *ccw;
3429  int useglobal;
3430 
3431  if (!capable(CAP_SYS_ADMIN))
3432  return -EACCES;
3433 
3434  useglobal = 0;
3435  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3436  if (IS_ERR(cqr)) {
3437  mutex_lock(&dasd_reserve_mutex);
3438  useglobal = 1;
3439  cqr = &dasd_reserve_req->cqr;
3440  memset(cqr, 0, sizeof(*cqr));
3441  memset(&dasd_reserve_req->ccw, 0,
3442  sizeof(dasd_reserve_req->ccw));
3443  cqr->cpaddr = &dasd_reserve_req->ccw;
3444  cqr->data = &dasd_reserve_req->data;
3445  cqr->magic = DASD_ECKD_MAGIC;
3446  }
3447  ccw = cqr->cpaddr;
3448  ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3449  ccw->flags |= CCW_FLAG_SLI;
3450  ccw->count = 32;
3451  ccw->cda = (__u32)(addr_t) cqr->data;
3452  cqr->startdev = device;
3453  cqr->memdev = device;
3454  clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3455  set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3456  cqr->retries = 2; /* set retry counter to enable basic ERP */
3457  cqr->expires = 2 * HZ;
3458  cqr->buildclk = get_clock();
3459  cqr->status = DASD_CQR_FILLED;
3460 
3461  rc = dasd_sleep_on_immediatly(cqr);
3462  if (!rc)
3463  set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3464 
3465  if (useglobal)
3466  mutex_unlock(&dasd_reserve_mutex);
3467  else
3468  dasd_sfree_request(cqr, cqr->memdev);
3469  return rc;
3470 }
3471 
3472 /*
3473  * Steal lock ioctl - unconditional reserve device.
3474  * Buils a channel programm to break a device's reservation.
3475  * (unconditional reserve)
3476  */
3477 static int
3478 dasd_eckd_steal_lock(struct dasd_device *device)
3479 {
3480  struct dasd_ccw_req *cqr;
3481  int rc;
3482  struct ccw1 *ccw;
3483  int useglobal;
3484 
3485  if (!capable(CAP_SYS_ADMIN))
3486  return -EACCES;
3487 
3488  useglobal = 0;
3489  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3490  if (IS_ERR(cqr)) {
3491  mutex_lock(&dasd_reserve_mutex);
3492  useglobal = 1;
3493  cqr = &dasd_reserve_req->cqr;
3494  memset(cqr, 0, sizeof(*cqr));
3495  memset(&dasd_reserve_req->ccw, 0,
3496  sizeof(dasd_reserve_req->ccw));
3497  cqr->cpaddr = &dasd_reserve_req->ccw;
3498  cqr->data = &dasd_reserve_req->data;
3499  cqr->magic = DASD_ECKD_MAGIC;
3500  }
3501  ccw = cqr->cpaddr;
3502  ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3503  ccw->flags |= CCW_FLAG_SLI;
3504  ccw->count = 32;
3505  ccw->cda = (__u32)(addr_t) cqr->data;
3506  cqr->startdev = device;
3507  cqr->memdev = device;
3508  clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3509  set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3510  cqr->retries = 2; /* set retry counter to enable basic ERP */
3511  cqr->expires = 2 * HZ;
3512  cqr->buildclk = get_clock();
3513  cqr->status = DASD_CQR_FILLED;
3514 
3515  rc = dasd_sleep_on_immediatly(cqr);
3516  if (!rc)
3517  set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3518 
3519  if (useglobal)
3520  mutex_unlock(&dasd_reserve_mutex);
3521  else
3522  dasd_sfree_request(cqr, cqr->memdev);
3523  return rc;
3524 }
3525 
3526 /*
3527  * SNID - Sense Path Group ID
3528  * This ioctl may be used in situations where I/O is stalled due to
3529  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3530  * preallocated dasd_reserve_req.
3531  */
3532 static int dasd_eckd_snid(struct dasd_device *device,
3533  void __user *argp)
3534 {
3535  struct dasd_ccw_req *cqr;
3536  int rc;
3537  struct ccw1 *ccw;
3538  int useglobal;
3539  struct dasd_snid_ioctl_data usrparm;
3540 
3541  if (!capable(CAP_SYS_ADMIN))
3542  return -EACCES;
3543 
3544  if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3545  return -EFAULT;
3546 
3547  useglobal = 0;
3548  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3549  sizeof(struct dasd_snid_data), device);
3550  if (IS_ERR(cqr)) {
3551  mutex_lock(&dasd_reserve_mutex);
3552  useglobal = 1;
3553  cqr = &dasd_reserve_req->cqr;
3554  memset(cqr, 0, sizeof(*cqr));
3555  memset(&dasd_reserve_req->ccw, 0,
3556  sizeof(dasd_reserve_req->ccw));
3557  cqr->cpaddr = &dasd_reserve_req->ccw;
3558  cqr->data = &dasd_reserve_req->data;
3559  cqr->magic = DASD_ECKD_MAGIC;
3560  }
3561  ccw = cqr->cpaddr;
3562  ccw->cmd_code = DASD_ECKD_CCW_SNID;
3563  ccw->flags |= CCW_FLAG_SLI;
3564  ccw->count = 12;
3565  ccw->cda = (__u32)(addr_t) cqr->data;
3566  cqr->startdev = device;
3567  cqr->memdev = device;
3568  clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3569  set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3570  set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3571  cqr->retries = 5;
3572  cqr->expires = 10 * HZ;
3573  cqr->buildclk = get_clock();
3574  cqr->status = DASD_CQR_FILLED;
3575  cqr->lpm = usrparm.path_mask;
3576 
3577  rc = dasd_sleep_on_immediatly(cqr);
3578  /* verify that I/O processing didn't modify the path mask */
3579  if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3580  rc = -EIO;
3581  if (!rc) {
3582  usrparm.data = *((struct dasd_snid_data *)cqr->data);
3583  if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3584  rc = -EFAULT;
3585  }
3586 
3587  if (useglobal)
3588  mutex_unlock(&dasd_reserve_mutex);
3589  else
3590  dasd_sfree_request(cqr, cqr->memdev);
3591  return rc;
3592 }
3593 
3594 /*
3595  * Read performance statistics
3596  */
3597 static int
3598 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3599 {
3600  struct dasd_psf_prssd_data *prssdp;
3601  struct dasd_rssd_perf_stats_t *stats;
3602  struct dasd_ccw_req *cqr;
3603  struct ccw1 *ccw;
3604  int rc;
3605 
3606  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
3607  (sizeof(struct dasd_psf_prssd_data) +
3608  sizeof(struct dasd_rssd_perf_stats_t)),
3609  device);
3610  if (IS_ERR(cqr)) {
3611  DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3612  "Could not allocate initialization request");
3613  return PTR_ERR(cqr);
3614  }
3615  cqr->startdev = device;
3616  cqr->memdev = device;
3617  cqr->retries = 0;
3618  clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3619  cqr->expires = 10 * HZ;
3620 
3621  /* Prepare for Read Subsystem Data */
3622  prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3623  memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3624  prssdp->order = PSF_ORDER_PRSSD;
3625  prssdp->suborder = 0x01; /* Performance Statistics */
3626  prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
3627 
3628  ccw = cqr->cpaddr;
3629  ccw->cmd_code = DASD_ECKD_CCW_PSF;
3630  ccw->count = sizeof(struct dasd_psf_prssd_data);
3631  ccw->flags |= CCW_FLAG_CC;
3632  ccw->cda = (__u32)(addr_t) prssdp;
3633 
3634  /* Read Subsystem Data - Performance Statistics */
3635  stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3636  memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3637 
3638  ccw++;
3639  ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3640  ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3641  ccw->cda = (__u32)(addr_t) stats;
3642 
3643  cqr->buildclk = get_clock();
3644  cqr->status = DASD_CQR_FILLED;
3645  rc = dasd_sleep_on(cqr);
3646  if (rc == 0) {
3647  prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3648  stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3649  if (copy_to_user(argp, stats,
3650  sizeof(struct dasd_rssd_perf_stats_t)))
3651  rc = -EFAULT;
3652  }
3653  dasd_sfree_request(cqr, cqr->memdev);
3654  return rc;
3655 }
3656 
3657 /*
3658  * Get attributes (cache operations)
3659  * Returnes the cache attributes used in Define Extend (DE).
3660  */
3661 static int
3662 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3663 {
3664  struct dasd_eckd_private *private =
3665  (struct dasd_eckd_private *)device->private;
3666  struct attrib_data_t attrib = private->attrib;
3667  int rc;
3668 
3669  if (!capable(CAP_SYS_ADMIN))
3670  return -EACCES;
3671  if (!argp)
3672  return -EINVAL;
3673 
3674  rc = 0;
3675  if (copy_to_user(argp, (long *) &attrib,
3676  sizeof(struct attrib_data_t)))
3677  rc = -EFAULT;
3678 
3679  return rc;
3680 }
3681 
3682 /*
3683  * Set attributes (cache operations)
3684  * Stores the attributes for cache operation to be used in Define Extend (DE).
3685  */
3686 static int
3687 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3688 {
3689  struct dasd_eckd_private *private =
3690  (struct dasd_eckd_private *)device->private;
3691  struct attrib_data_t attrib;
3692 
3693  if (!capable(CAP_SYS_ADMIN))
3694  return -EACCES;
3695  if (!argp)
3696  return -EINVAL;
3697 
3698  if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3699  return -EFAULT;
3700  private->attrib = attrib;
3701 
3702  dev_info(&device->cdev->dev,
3703  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3704  private->attrib.operation, private->attrib.nr_cyl);
3705  return 0;
3706 }
3707 
3708 /*
3709  * Issue syscall I/O to EMC Symmetrix array.
3710  * CCWs are PSF and RSSD
3711  */
3712 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3713 {
3714  struct dasd_symmio_parms usrparm;
3715  char *psf_data, *rssd_result;
3716  struct dasd_ccw_req *cqr;
3717  struct ccw1 *ccw;
3718  char psf0, psf1;
3719  int rc;
3720 
3721  if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3722  return -EACCES;
3723  psf0 = psf1 = 0;
3724 
3725  /* Copy parms from caller */
3726  rc = -EFAULT;
3727  if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3728  goto out;
3729  if (is_compat_task() || sizeof(long) == 4) {
3730  /* Make sure pointers are sane even on 31 bit. */
3731  rc = -EINVAL;
3732  if ((usrparm.psf_data >> 32) != 0)
3733  goto out;
3734  if ((usrparm.rssd_result >> 32) != 0)
3735  goto out;
3736  usrparm.psf_data &= 0x7fffffffULL;
3737  usrparm.rssd_result &= 0x7fffffffULL;
3738  }
3739  /* alloc I/O data area */
3740  psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3741  rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3742  if (!psf_data || !rssd_result) {
3743  rc = -ENOMEM;
3744  goto out_free;
3745  }
3746 
3747  /* get syscall header from user space */
3748  rc = -EFAULT;
3749  if (copy_from_user(psf_data,
3750  (void __user *)(unsigned long) usrparm.psf_data,
3751  usrparm.psf_data_len))
3752  goto out_free;
3753  psf0 = psf_data[0];
3754  psf1 = psf_data[1];
3755 
3756  /* setup CCWs for PSF + RSSD */
3757  cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3758  if (IS_ERR(cqr)) {
3759  DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3760  "Could not allocate initialization request");
3761  rc = PTR_ERR(cqr);
3762  goto out_free;
3763  }
3764 
3765  cqr->startdev = device;
3766  cqr->memdev = device;
3767  cqr->retries = 3;
3768  cqr->expires = 10 * HZ;
3769  cqr->buildclk = get_clock();
3770  cqr->status = DASD_CQR_FILLED;
3771 
3772  /* Build the ccws */
3773  ccw = cqr->cpaddr;
3774 
3775  /* PSF ccw */
3776  ccw->cmd_code = DASD_ECKD_CCW_PSF;
3777  ccw->count = usrparm.psf_data_len;
3778  ccw->flags |= CCW_FLAG_CC;
3779  ccw->cda = (__u32)(addr_t) psf_data;
3780 
3781  ccw++;
3782 
3783  /* RSSD ccw */
3784  ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3785  ccw->count = usrparm.rssd_result_len;
3786  ccw->flags = CCW_FLAG_SLI ;
3787  ccw->cda = (__u32)(addr_t) rssd_result;
3788 
3789  rc = dasd_sleep_on(cqr);
3790  if (rc)
3791  goto out_sfree;
3792 
3793  rc = -EFAULT;
3794  if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3795  rssd_result, usrparm.rssd_result_len))
3796  goto out_sfree;
3797  rc = 0;
3798 
3799 out_sfree:
3800  dasd_sfree_request(cqr, cqr->memdev);
3801 out_free:
3802  kfree(rssd_result);
3803  kfree(psf_data);
3804 out:
3805  DBF_DEV_EVENT(DBF_WARNING, device,
3806  "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3807  (int) psf0, (int) psf1, rc);
3808  return rc;
3809 }
3810 
3811 static int
3812 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3813 {
3814  struct dasd_device *device = block->base;
3815 
3816  switch (cmd) {
3817  case BIODASDGATTR:
3818  return dasd_eckd_get_attrib(device, argp);
3819  case BIODASDSATTR:
3820  return dasd_eckd_set_attrib(device, argp);
3821  case BIODASDPSRD:
3822  return dasd_eckd_performance(device, argp);
3823  case BIODASDRLSE:
3824  return dasd_eckd_release(device);
3825  case BIODASDRSRV:
3826  return dasd_eckd_reserve(device);
3827  case BIODASDSLCK:
3828  return dasd_eckd_steal_lock(device);
3829  case BIODASDSNID:
3830  return dasd_eckd_snid(device, argp);
3831  case BIODASDSYMMIO:
3832  return dasd_symm_io(device, argp);
3833  default:
3834  return -ENOTTY;
3835  }
3836 }
3837 
3838 /*
3839  * Dump the range of CCWs into 'page' buffer
3840  * and return number of printed chars.
3841  */
3842 static int
3843 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
3844 {
3845  int len, count;
3846  char *datap;
3847 
3848  len = 0;
3849  while (from <= to) {
3850  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3851  " CCW %p: %08X %08X DAT:",
3852  from, ((int *) from)[0], ((int *) from)[1]);
3853 
3854  /* get pointer to data (consider IDALs) */
3855  if (from->flags & CCW_FLAG_IDA)
3856  datap = (char *) *((addr_t *) (addr_t) from->cda);
3857  else
3858  datap = (char *) ((addr_t) from->cda);
3859 
3860  /* dump data (max 32 bytes) */
3861  for (count = 0; count < from->count && count < 32; count++) {
3862  if (count % 8 == 0) len += sprintf(page + len, " ");
3863  if (count % 4 == 0) len += sprintf(page + len, " ");
3864  len += sprintf(page + len, "%02x", datap[count]);
3865  }
3866  len += sprintf(page + len, "\n");
3867  from++;
3868  }
3869  return len;
3870 }
3871 
3872 static void
3873 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
3874  char *reason)
3875 {
3876  u64 *sense;
3877  u64 *stat;
3878 
3879  sense = (u64 *) dasd_get_sense(irb);
3880  stat = (u64 *) &irb->scsw;
3881  if (sense) {
3882  DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
3883  "%016llx %016llx %016llx %016llx",
3884  reason, *stat, *((u32 *) (stat + 1)),
3885  sense[0], sense[1], sense[2], sense[3]);
3886  } else {
3887  DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
3888  reason, *stat, *((u32 *) (stat + 1)),
3889  "NO VALID SENSE");
3890  }
3891 }
3892 
3893 /*
3894  * Print sense data and related channel program.
3895  * Parts are printed because printk buffer is only 1024 bytes.
3896  */
3897 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3898  struct dasd_ccw_req *req, struct irb *irb)
3899 {
3900  char *page;
3901  struct ccw1 *first, *last, *fail, *from, *to;
3902  int len, sl, sct;
3903 
3904  page = (char *) get_zeroed_page(GFP_ATOMIC);
3905  if (page == NULL) {
3906  DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3907  "No memory to dump sense data\n");
3908  return;
3909  }
3910  /* dump the sense data */
3911  len = sprintf(page, KERN_ERR PRINTK_HEADER
3912  " I/O status report for device %s:\n",
3913  dev_name(&device->cdev->dev));
3914  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3915  " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3916  "CS:%02X RC:%d\n",
3917  req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3918  scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3919  scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3920  req ? req->intrc : 0);
3921  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3922  " device %s: Failing CCW: %p\n",
3923  dev_name(&device->cdev->dev),
3924  (void *) (addr_t) irb->scsw.cmd.cpa);
3925  if (irb->esw.esw0.erw.cons) {
3926  for (sl = 0; sl < 4; sl++) {
3927  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3928  " Sense(hex) %2d-%2d:",
3929  (8 * sl), ((8 * sl) + 7));
3930 
3931  for (sct = 0; sct < 8; sct++) {
3932  len += sprintf(page + len, " %02x",
3933  irb->ecw[8 * sl + sct]);
3934  }
3935  len += sprintf(page + len, "\n");
3936  }
3937 
3938  if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3939  /* 24 Byte Sense Data */
3940  sprintf(page + len, KERN_ERR PRINTK_HEADER
3941  " 24 Byte: %x MSG %x, "
3942  "%s MSGb to SYSOP\n",
3943  irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3944  irb->ecw[1] & 0x10 ? "" : "no");
3945  } else {
3946  /* 32 Byte Sense Data */
3947  sprintf(page + len, KERN_ERR PRINTK_HEADER
3948  " 32 Byte: Format: %x "
3949  "Exception class %x\n",
3950  irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3951  }
3952  } else {
3953  sprintf(page + len, KERN_ERR PRINTK_HEADER
3954  " SORRY - NO VALID SENSE AVAILABLE\n");
3955  }
3956  printk("%s", page);
3957 
3958  if (req) {
3959  /* req == NULL for unsolicited interrupts */
3960  /* dump the Channel Program (max 140 Bytes per line) */
3961  /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3962  first = req->cpaddr;
3963  for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3964  to = min(first + 6, last);
3965  len = sprintf(page, KERN_ERR PRINTK_HEADER
3966  " Related CP in req: %p\n", req);
3967  dasd_eckd_dump_ccw_range(first, to, page + len);
3968  printk("%s", page);
3969 
3970  /* print failing CCW area (maximum 4) */
3971  /* scsw->cda is either valid or zero */
3972  len = 0;
3973  from = ++to;
3974  fail = (struct ccw1 *)(addr_t)
3975  irb->scsw.cmd.cpa; /* failing CCW */
3976  if (from < fail - 2) {
3977  from = fail - 2; /* there is a gap - print header */
3978  len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3979  }
3980  to = min(fail + 1, last);
3981  len += dasd_eckd_dump_ccw_range(from, to, page + len);
3982 
3983  /* print last CCWs (maximum 2) */
3984  from = max(from, ++to);
3985  if (from < last - 1) {
3986  from = last - 1; /* there is a gap - print header */
3987  len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3988  }
3989  len += dasd_eckd_dump_ccw_range(from, last, page + len);
3990  if (len > 0)
3991  printk("%s", page);
3992  }
3993  free_page((unsigned long) page);
3994 }
3995 
3996 
3997 /*
3998  * Print sense data from a tcw.
3999  */
4000 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4001  struct dasd_ccw_req *req, struct irb *irb)
4002 {
4003  char *page;
4004  int len, sl, sct, residual;
4005  struct tsb *tsb;
4006  u8 *sense, *rcq;
4007 
4008  page = (char *) get_zeroed_page(GFP_ATOMIC);
4009  if (page == NULL) {
4010  DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4011  "No memory to dump sense data");
4012  return;
4013  }
4014  /* dump the sense data */
4015  len = sprintf(page, KERN_ERR PRINTK_HEADER
4016  " I/O status report for device %s:\n",
4017  dev_name(&device->cdev->dev));
4018  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4019  " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4020  "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4021  req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4022  scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4023  scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4024  irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4025  req ? req->intrc : 0);
4026  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4027  " device %s: Failing TCW: %p\n",
4028  dev_name(&device->cdev->dev),
4029  (void *) (addr_t) irb->scsw.tm.tcw);
4030 
4031  tsb = NULL;
4032  sense = NULL;
4033  if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4034  tsb = tcw_get_tsb(
4035  (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4036 
4037  if (tsb) {
4038  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4039  " tsb->length %d\n", tsb->length);
4040  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4041  " tsb->flags %x\n", tsb->flags);
4042  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4043  " tsb->dcw_offset %d\n", tsb->dcw_offset);
4044  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4045  " tsb->count %d\n", tsb->count);
4046  residual = tsb->count - 28;
4047  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4048  " residual %d\n", residual);
4049 
4050  switch (tsb->flags & 0x07) {
4051  case 1: /* tsa_iostat */
4052  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4053  " tsb->tsa.iostat.dev_time %d\n",
4054  tsb->tsa.iostat.dev_time);
4055  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4056  " tsb->tsa.iostat.def_time %d\n",
4057  tsb->tsa.iostat.def_time);
4058  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4059  " tsb->tsa.iostat.queue_time %d\n",
4060  tsb->tsa.iostat.queue_time);
4061  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4062  " tsb->tsa.iostat.dev_busy_time %d\n",
4063  tsb->tsa.iostat.dev_busy_time);
4064  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4065  " tsb->tsa.iostat.dev_act_time %d\n",
4066  tsb->tsa.iostat.dev_act_time);
4067  sense = tsb->tsa.iostat.sense;
4068  break;
4069  case 2: /* ts_ddpc */
4070  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4071  " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4072  for (sl = 0; sl < 2; sl++) {
4073  len += sprintf(page + len,
4074  KERN_ERR PRINTK_HEADER
4075  " tsb->tsa.ddpc.rcq %2d-%2d: ",
4076  (8 * sl), ((8 * sl) + 7));
4077  rcq = tsb->tsa.ddpc.rcq;
4078  for (sct = 0; sct < 8; sct++) {
4079  len += sprintf(page + len, " %02x",
4080  rcq[8 * sl + sct]);
4081  }
4082  len += sprintf(page + len, "\n");
4083  }
4084  sense = tsb->tsa.ddpc.sense;
4085  break;
4086  case 3: /* tsa_intrg */
4087  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4088  " tsb->tsa.intrg.: not supportet yet \n");
4089  break;
4090  }
4091 
4092  if (sense) {
4093  for (sl = 0; sl < 4; sl++) {
4094  len += sprintf(page + len,
4095  KERN_ERR PRINTK_HEADER
4096  " Sense(hex) %2d-%2d:",
4097  (8 * sl), ((8 * sl) + 7));
4098  for (sct = 0; sct < 8; sct++) {
4099  len += sprintf(page + len, " %02x",
4100  sense[8 * sl + sct]);
4101  }
4102  len += sprintf(page + len, "\n");
4103  }
4104 
4105  if (sense[27] & DASD_SENSE_BIT_0) {
4106  /* 24 Byte Sense Data */
4107  sprintf(page + len, KERN_ERR PRINTK_HEADER
4108  " 24 Byte: %x MSG %x, "
4109  "%s MSGb to SYSOP\n",
4110  sense[7] >> 4, sense[7] & 0x0f,
4111  sense[1] & 0x10 ? "" : "no");
4112  } else {
4113  /* 32 Byte Sense Data */
4114  sprintf(page + len, KERN_ERR PRINTK_HEADER
4115  " 32 Byte: Format: %x "
4116  "Exception class %x\n",
4117  sense[6] & 0x0f, sense[22] >> 4);
4118  }
4119  } else {
4120  sprintf(page + len, KERN_ERR PRINTK_HEADER
4121  " SORRY - NO VALID SENSE AVAILABLE\n");
4122  }
4123  } else {
4124  sprintf(page + len, KERN_ERR PRINTK_HEADER
4125  " SORRY - NO TSB DATA AVAILABLE\n");
4126  }
4127  printk("%s", page);
4128  free_page((unsigned long) page);
4129 }
4130 
4131 static void dasd_eckd_dump_sense(struct dasd_device *device,
4132  struct dasd_ccw_req *req, struct irb *irb)
4133 {
4134  if (scsw_is_tm(&irb->scsw))
4135  dasd_eckd_dump_sense_tcw(device, req, irb);
4136  else
4137  dasd_eckd_dump_sense_ccw(device, req, irb);
4138 }
4139 
4140 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4141 {
4142  /*
4143  * the device should be disconnected from our LCU structure
4144  * on restore we will reconnect it and reread LCU specific
4145  * information like PAV support that might have changed
4146  */
4147  dasd_alias_remove_device(device);
4148  dasd_alias_disconnect_device_from_lcu(device);
4149 
4150  return 0;
4151 }
4152 
4153 static int dasd_eckd_restore_device(struct dasd_device *device)
4154 {
4155  struct dasd_eckd_private *private;
4156  struct dasd_eckd_characteristics temp_rdc_data;
4157  int rc;
4158  struct dasd_uid temp_uid;
4159  unsigned long flags;
4160 
4161  private = (struct dasd_eckd_private *) device->private;
4162 
4163  /* Read Configuration Data */
4164  rc = dasd_eckd_read_conf(device);
4165  if (rc)
4166  goto out_err;
4167 
4168  dasd_eckd_get_uid(device, &temp_uid);
4169  /* Generate device unique id */
4170  rc = dasd_eckd_generate_uid(device);
4171  spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4172  if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4173  dev_err(&device->cdev->dev, "The UID of the DASD has "
4174  "changed\n");
4175  spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4176  if (rc)
4177  goto out_err;
4178 
4179  /* register lcu with alias handling, enable PAV if this is a new lcu */
4180  rc = dasd_alias_make_device_known_to_lcu(device);
4181  if (rc)
4182  return rc;
4183  dasd_eckd_validate_server(device, DASD_CQR_FLAGS_FAILFAST);
4184 
4185  /* RE-Read Configuration Data */
4186  rc = dasd_eckd_read_conf(device);
4187  if (rc)
4188  goto out_err;
4189 
4190  /* Read Feature Codes */
4191  dasd_eckd_read_features(device);
4192 
4193  /* Read Device Characteristics */
4194  rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4195  &temp_rdc_data, 64);
4196  if (rc) {
4197  DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4198  "Read device characteristic failed, rc=%d", rc);
4199  goto out_err;
4200  }
4201  spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4202  memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4203  spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4204 
4205  /* add device to alias management */
4206  dasd_alias_add_device(device);
4207 
4208  return 0;
4209 
4210 out_err:
4211  return -1;
4212 }
4213 
4214 static int dasd_eckd_reload_device(struct dasd_device *device)
4215 {
4216  struct dasd_eckd_private *private;
4217  int rc, old_base;
4218  char print_uid[60];
4219  struct dasd_uid uid;
4220  unsigned long flags;
4221 
4222  private = (struct dasd_eckd_private *) device->private;
4223 
4224  spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4225  old_base = private->uid.base_unit_addr;
4226  spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4227 
4228  /* Read Configuration Data */
4229  rc = dasd_eckd_read_conf(device);
4230  if (rc)
4231  goto out_err;
4232 
4233  rc = dasd_eckd_generate_uid(device);
4234  if (rc)
4235  goto out_err;
4236  /*
4237  * update unit address configuration and
4238  * add device to alias management
4239  */
4240  dasd_alias_update_add_device(device);
4241 
4242  dasd_eckd_get_uid(device, &uid);
4243 
4244  if (old_base != uid.base_unit_addr) {
4245  if (strlen(uid.vduit) > 0)
4246  snprintf(print_uid, sizeof(print_uid),
4247  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4248  uid.ssid, uid.base_unit_addr, uid.vduit);
4249  else
4250  snprintf(print_uid, sizeof(print_uid),
4251  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4252  uid.ssid, uid.base_unit_addr);
4253 
4254  dev_info(&device->cdev->dev,
4255  "An Alias device was reassigned to a new base device "
4256  "with UID: %s\n", print_uid);
4257  }
4258  return 0;
4259 
4260 out_err:
4261  return -1;
4262 }
4263 
4264 static struct ccw_driver dasd_eckd_driver = {
4265  .driver = {
4266  .name = "dasd-eckd",
4267  .owner = THIS_MODULE,
4268  },
4269  .ids = dasd_eckd_ids,
4270  .probe = dasd_eckd_probe,
4271  .remove = dasd_generic_remove,
4272  .set_offline = dasd_generic_set_offline,
4273  .set_online = dasd_eckd_set_online,
4274  .notify = dasd_generic_notify,
4275  .path_event = dasd_generic_path_event,
4276  .shutdown = dasd_generic_shutdown,
4277  .freeze = dasd_generic_pm_freeze,
4278  .thaw = dasd_generic_restore_device,
4279  .restore = dasd_generic_restore_device,
4280  .uc_handler = dasd_generic_uc_handler,
4281  .int_class = IOINT_DAS,
4282 };
4283 
4284 /*
4285  * max_blocks is dependent on the amount of storage that is available
4286  * in the static io buffer for each device. Currently each device has
4287  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4288  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4289  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4290  * addition we have one define extent ccw + 16 bytes of data and one
4291  * locate record ccw + 16 bytes of data. That makes:
4292  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4293  * We want to fit two into the available memory so that we can immediately
4294  * start the next request if one finishes off. That makes 249.5 blocks
4295  * for one request. Give a little safety and the result is 240.
4296  */
4297 static struct dasd_discipline dasd_eckd_discipline = {
4298  .owner = THIS_MODULE,
4299  .name = "ECKD",
4300  .ebcname = "ECKD",
4301  .max_blocks = 190,
4302  .check_device = dasd_eckd_check_characteristics,
4303  .uncheck_device = dasd_eckd_uncheck_device,
4304  .do_analysis = dasd_eckd_do_analysis,
4305  .verify_path = dasd_eckd_verify_path,
4306  .ready_to_online = dasd_eckd_ready_to_online,
4307  .online_to_ready = dasd_eckd_online_to_ready,
4308  .fill_geometry = dasd_eckd_fill_geometry,
4309  .start_IO = dasd_start_IO,
4310  .term_IO = dasd_term_IO,
4311  .handle_terminated_request = dasd_eckd_handle_terminated_request,
4312  .format_device = dasd_eckd_format_device,
4313  .erp_action = dasd_eckd_erp_action,
4314  .erp_postaction = dasd_eckd_erp_postaction,
4315  .check_for_device_change = dasd_eckd_check_for_device_change,
4316  .build_cp = dasd_eckd_build_alias_cp,
4317  .free_cp = dasd_eckd_free_alias_cp,
4318  .dump_sense = dasd_eckd_dump_sense,
4319  .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4320  .fill_info = dasd_eckd_fill_info,
4321  .ioctl = dasd_eckd_ioctl,
4322  .freeze = dasd_eckd_pm_freeze,
4323  .restore = dasd_eckd_restore_device,
4324  .reload = dasd_eckd_reload_device,
4325  .get_uid = dasd_eckd_get_uid,
4326  .kick_validate = dasd_eckd_kick_validate_server,
4327 };
4328 
4329 static int __init
4330 dasd_eckd_init(void)
4331 {
4332  int ret;
4333 
4334  ASCEBC(dasd_eckd_discipline.ebcname, 4);
4335  dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4336  GFP_KERNEL | GFP_DMA);
4337  if (!dasd_reserve_req)
4338  return -ENOMEM;
4339  path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4340  GFP_KERNEL | GFP_DMA);
4341  if (!path_verification_worker) {
4342  kfree(dasd_reserve_req);
4343  return -ENOMEM;
4344  }
4345  ret = ccw_driver_register(&dasd_eckd_driver);
4346  if (!ret)
4347  wait_for_device_probe();
4348  else {
4349  kfree(path_verification_worker);
4350  kfree(dasd_reserve_req);
4351  }
4352  return ret;
4353 }
4354 
4355 static void __exit
4356 dasd_eckd_cleanup(void)
4357 {
4358  ccw_driver_unregister(&dasd_eckd_driver);
4359  kfree(path_verification_worker);
4360  kfree(dasd_reserve_req);
4361 }
4362 
4363 module_init(dasd_eckd_init);
4364 module_exit(dasd_eckd_cleanup);
Generated on Thu Jan 10 2013 14:17:11 for Linux Kernel by   doxygen 1.8.2