Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus
[linux-2.6] / drivers / s390 / cio / device_status.c
1 /*
2  * drivers/s390/cio/device_status.c
3  *
4  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
5  *                       IBM Corporation
6  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
8  *
9  * Status accumulation and basic sense functions.
10  */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14
15 #include <asm/ccwdev.h>
16 #include <asm/cio.h>
17
18 #include "cio.h"
19 #include "cio_debug.h"
20 #include "css.h"
21 #include "device.h"
22 #include "ioasm.h"
23
24 /*
25  * Check for any kind of channel or interface control check but don't
26  * issue the message for the console device
27  */
28 static inline void
29 ccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb)
30 {
31         if (!(irb->scsw.cstat & (SCHN_STAT_CHN_DATA_CHK |
32                                  SCHN_STAT_CHN_CTRL_CHK |
33                                  SCHN_STAT_INTF_CTRL_CHK)))
34                 return;
35         CIO_MSG_EVENT(0, "Channel-Check or Interface-Control-Check "
36                       "received"
37                       " ... device %04x on subchannel 0.%x.%04x, dev_stat "
38                       ": %02X sch_stat : %02X\n",
39                       cdev->private->dev_id.devno, cdev->private->schid.ssid,
40                       cdev->private->schid.sch_no,
41                       irb->scsw.dstat, irb->scsw.cstat);
42
43         if (irb->scsw.cc != 3) {
44                 char dbf_text[15];
45
46                 sprintf(dbf_text, "chk%x", cdev->private->schid.sch_no);
47                 CIO_TRACE_EVENT(0, dbf_text);
48                 CIO_HEX_EVENT(0, irb, sizeof (struct irb));
49         }
50 }
51
52 /*
53  * Some paths became not operational (pno bit in scsw is set).
54  */
55 static void
56 ccw_device_path_notoper(struct ccw_device *cdev)
57 {
58         struct subchannel *sch;
59
60         sch = to_subchannel(cdev->dev.parent);
61         stsch (sch->schid, &sch->schib);
62
63         CIO_MSG_EVENT(0, "%s(0.%x.%04x) - path(s) %02x are "
64                       "not operational \n", __FUNCTION__,
65                       sch->schid.ssid, sch->schid.sch_no,
66                       sch->schib.pmcw.pnom);
67
68         sch->lpm &= ~sch->schib.pmcw.pnom;
69         cdev->private->flags.doverify = 1;
70 }
71
72 /*
73  * Copy valid bits from the extended control word to device irb.
74  */
75 static inline void
76 ccw_device_accumulate_ecw(struct ccw_device *cdev, struct irb *irb)
77 {
78         /*
79          * Copy extended control bit if it is valid... yes there
80          * are condition that have to be met for the extended control
81          * bit to have meaning. Sick.
82          */
83         cdev->private->irb.scsw.ectl = 0;
84         if ((irb->scsw.stctl & SCSW_STCTL_ALERT_STATUS) &&
85             !(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS))
86                 cdev->private->irb.scsw.ectl = irb->scsw.ectl;
87         /* Check if extended control word is valid. */
88         if (!cdev->private->irb.scsw.ectl)
89                 return;
90         /* Copy concurrent sense / model dependent information. */
91         memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw));
92 }
93
94 /*
95  * Check if extended status word is valid.
96  */
97 static inline int
98 ccw_device_accumulate_esw_valid(struct irb *irb)
99 {
100         if (!irb->scsw.eswf && irb->scsw.stctl == SCSW_STCTL_STATUS_PEND)
101                 return 0;
102         if (irb->scsw.stctl == 
103                         (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND) &&
104             !(irb->scsw.actl & SCSW_ACTL_SUSPENDED))
105                 return 0;
106         return 1;
107 }
108
109 /*
110  * Copy valid bits from the extended status word to device irb.
111  */
112 static inline void
113 ccw_device_accumulate_esw(struct ccw_device *cdev, struct irb *irb)
114 {
115         struct irb *cdev_irb;
116         struct sublog *cdev_sublog, *sublog;
117
118         if (!ccw_device_accumulate_esw_valid(irb))
119                 return;
120
121         cdev_irb = &cdev->private->irb;
122
123         /* Copy last path used mask. */
124         cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum;
125
126         /* Copy subchannel logout information if esw is of format 0. */
127         if (irb->scsw.eswf) {
128                 cdev_sublog = &cdev_irb->esw.esw0.sublog;
129                 sublog = &irb->esw.esw0.sublog;
130                 /* Copy extended status flags. */
131                 cdev_sublog->esf = sublog->esf;
132                 /*
133                  * Copy fields that have a meaning for channel data check
134                  * channel control check and interface control check.
135                  */
136                 if (irb->scsw.cstat & (SCHN_STAT_CHN_DATA_CHK |
137                                        SCHN_STAT_CHN_CTRL_CHK |
138                                        SCHN_STAT_INTF_CTRL_CHK)) {
139                         /* Copy ancillary report bit. */
140                         cdev_sublog->arep = sublog->arep;
141                         /* Copy field-validity-flags. */
142                         cdev_sublog->fvf = sublog->fvf;
143                         /* Copy storage access code. */
144                         cdev_sublog->sacc = sublog->sacc;
145                         /* Copy termination code. */
146                         cdev_sublog->termc = sublog->termc;
147                         /* Copy sequence code. */
148                         cdev_sublog->seqc = sublog->seqc;
149                 }
150                 /* Copy device status check. */
151                 cdev_sublog->devsc = sublog->devsc;
152                 /* Copy secondary error. */
153                 cdev_sublog->serr = sublog->serr;
154                 /* Copy i/o-error alert. */
155                 cdev_sublog->ioerr = sublog->ioerr;
156                 /* Copy channel path timeout bit. */
157                 if (irb->scsw.cstat & SCHN_STAT_INTF_CTRL_CHK)
158                         cdev_irb->esw.esw0.erw.cpt = irb->esw.esw0.erw.cpt;
159                 /* Copy failing storage address validity flag. */
160                 cdev_irb->esw.esw0.erw.fsavf = irb->esw.esw0.erw.fsavf;
161                 if (cdev_irb->esw.esw0.erw.fsavf) {
162                         /* ... and copy the failing storage address. */
163                         memcpy(cdev_irb->esw.esw0.faddr, irb->esw.esw0.faddr,
164                                sizeof (irb->esw.esw0.faddr));
165                         /* ... and copy the failing storage address format. */
166                         cdev_irb->esw.esw0.erw.fsaf = irb->esw.esw0.erw.fsaf;
167                 }
168                 /* Copy secondary ccw address validity bit. */
169                 cdev_irb->esw.esw0.erw.scavf = irb->esw.esw0.erw.scavf;
170                 if (irb->esw.esw0.erw.scavf)
171                         /* ... and copy the secondary ccw address. */
172                         cdev_irb->esw.esw0.saddr = irb->esw.esw0.saddr;
173                 
174         }
175         /* FIXME: DCTI for format 2? */
176
177         /* Copy authorization bit. */
178         cdev_irb->esw.esw0.erw.auth = irb->esw.esw0.erw.auth;
179         /* Copy path verification required flag. */
180         cdev_irb->esw.esw0.erw.pvrf = irb->esw.esw0.erw.pvrf;
181         if (irb->esw.esw0.erw.pvrf)
182                 cdev->private->flags.doverify = 1;
183         /* Copy concurrent sense bit. */
184         cdev_irb->esw.esw0.erw.cons = irb->esw.esw0.erw.cons;
185         if (irb->esw.esw0.erw.cons)
186                 cdev_irb->esw.esw0.erw.scnt = irb->esw.esw0.erw.scnt;
187 }
188
189 /*
190  * Accumulate status from irb to devstat.
191  */
192 void
193 ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
194 {
195         struct irb *cdev_irb;
196
197         /*
198          * Check if the status pending bit is set in stctl.
199          * If not, the remaining bit have no meaning and we must ignore them.
200          * The esw is not meaningful as well...
201          */
202         if (!(irb->scsw.stctl & SCSW_STCTL_STATUS_PEND))
203                 return;
204
205         /* Check for channel checks and interface control checks. */
206         ccw_device_msg_control_check(cdev, irb);
207
208         /* Check for path not operational. */
209         if (irb->scsw.pno && irb->scsw.fctl != 0 &&
210             (!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) ||
211              (irb->scsw.actl & SCSW_ACTL_SUSPENDED)))
212                 ccw_device_path_notoper(cdev);
213
214         /*
215          * Don't accumulate unsolicited interrupts.
216          */
217         if ((irb->scsw.stctl ==
218              (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
219             (!irb->scsw.cc))
220                 return;
221
222         cdev_irb = &cdev->private->irb;
223
224         /* Copy bits which are valid only for the start function. */
225         if (irb->scsw.fctl & SCSW_FCTL_START_FUNC) {
226                 /* Copy key. */
227                 cdev_irb->scsw.key = irb->scsw.key;
228                 /* Copy suspend control bit. */
229                 cdev_irb->scsw.sctl = irb->scsw.sctl;
230                 /* Accumulate deferred condition code. */
231                 cdev_irb->scsw.cc |= irb->scsw.cc;
232                 /* Copy ccw format bit. */
233                 cdev_irb->scsw.fmt = irb->scsw.fmt;
234                 /* Copy prefetch bit. */
235                 cdev_irb->scsw.pfch = irb->scsw.pfch;
236                 /* Copy initial-status-interruption-control. */
237                 cdev_irb->scsw.isic = irb->scsw.isic;
238                 /* Copy address limit checking control. */
239                 cdev_irb->scsw.alcc = irb->scsw.alcc;
240                 /* Copy suppress suspend bit. */
241                 cdev_irb->scsw.ssi = irb->scsw.ssi;
242         }
243
244         /* Take care of the extended control bit and extended control word. */
245         ccw_device_accumulate_ecw(cdev, irb);
246             
247         /* Accumulate function control. */
248         cdev_irb->scsw.fctl |= irb->scsw.fctl;
249         /* Copy activity control. */
250         cdev_irb->scsw.actl= irb->scsw.actl;
251         /* Accumulate status control. */
252         cdev_irb->scsw.stctl |= irb->scsw.stctl;
253         /*
254          * Copy ccw address if it is valid. This is a bit simplified
255          * but should be close enough for all practical purposes.
256          */
257         if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) ||
258             ((irb->scsw.stctl == 
259               (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND)) &&
260              (irb->scsw.actl & SCSW_ACTL_DEVACT) &&
261              (irb->scsw.actl & SCSW_ACTL_SCHACT)) ||
262             (irb->scsw.actl & SCSW_ACTL_SUSPENDED))
263                 cdev_irb->scsw.cpa = irb->scsw.cpa;
264         /* Accumulate device status, but not the device busy flag. */
265         cdev_irb->scsw.dstat &= ~DEV_STAT_BUSY;
266         cdev_irb->scsw.dstat |= irb->scsw.dstat;
267         /* Accumulate subchannel status. */
268         cdev_irb->scsw.cstat |= irb->scsw.cstat;
269         /* Copy residual count if it is valid. */
270         if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
271             (irb->scsw.cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN)) == 0)
272                 cdev_irb->scsw.count = irb->scsw.count;
273
274         /* Take care of bits in the extended status word. */
275         ccw_device_accumulate_esw(cdev, irb);
276
277         /*
278          * Check whether we must issue a SENSE CCW ourselves if there is no
279          * concurrent sense facility installed for the subchannel.
280          * No sense is required if no delayed sense is pending
281          * and we did not get a unit check without sense information.
282          *
283          * Note: We should check for ioinfo[irq]->flags.consns but VM
284          *       violates the ESA/390 architecture and doesn't present an
285          *       operand exception for virtual devices without concurrent
286          *       sense facility available/supported when enabling the
287          *       concurrent sense facility.
288          */
289         if ((cdev_irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
290             !(cdev_irb->esw.esw0.erw.cons))
291                 cdev->private->flags.dosense = 1;
292 }
293
294 /*
295  * Do a basic sense.
296  */
297 int
298 ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb)
299 {
300         struct subchannel *sch;
301
302         sch = to_subchannel(cdev->dev.parent);
303
304         /* A sense is required, can we do it now ? */
305         if ((irb->scsw.actl  & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
306                 /*
307                  * we received an Unit Check but we have no final
308                  *  status yet, therefore we must delay the SENSE
309                  *  processing. We must not report this intermediate
310                  *  status to the device interrupt handler.
311                  */
312                 return -EBUSY;
313
314         /*
315          * We have ending status but no sense information. Do a basic sense.
316          */
317         sch->sense_ccw.cmd_code = CCW_CMD_BASIC_SENSE;
318         sch->sense_ccw.cda = (__u32) __pa(cdev->private->irb.ecw);
319         sch->sense_ccw.count = SENSE_MAX_COUNT;
320         sch->sense_ccw.flags = CCW_FLAG_SLI;
321
322         return cio_start (sch, &sch->sense_ccw, 0xff);
323 }
324
325 /*
326  * Add information from basic sense to devstat.
327  */
328 void
329 ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb)
330 {
331         /*
332          * Check if the status pending bit is set in stctl.
333          * If not, the remaining bit have no meaning and we must ignore them.
334          * The esw is not meaningful as well...
335          */
336         if (!(irb->scsw.stctl & SCSW_STCTL_STATUS_PEND))
337                 return;
338
339         /* Check for channel checks and interface control checks. */
340         ccw_device_msg_control_check(cdev, irb);
341
342         /* Check for path not operational. */
343         if (irb->scsw.pno && irb->scsw.fctl != 0 &&
344             (!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) ||
345              (irb->scsw.actl & SCSW_ACTL_SUSPENDED)))
346                 ccw_device_path_notoper(cdev);
347
348         if (!(irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
349             (irb->scsw.dstat & DEV_STAT_CHN_END)) {
350                 cdev->private->irb.esw.esw0.erw.cons = 1;
351                 cdev->private->flags.dosense = 0;
352         }
353         /* Check if path verification is required. */
354         if (ccw_device_accumulate_esw_valid(irb) &&
355             irb->esw.esw0.erw.pvrf)
356                 cdev->private->flags.doverify = 1;
357 }
358
359 /*
360  * This function accumulates the status into the private devstat and
361  * starts a basic sense if one is needed.
362  */
363 int
364 ccw_device_accumulate_and_sense(struct ccw_device *cdev, struct irb *irb)
365 {
366         ccw_device_accumulate_irb(cdev, irb);
367         if ((irb->scsw.actl  & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
368                 return -EBUSY;
369         /* Check for basic sense. */
370         if (cdev->private->flags.dosense &&
371             !(irb->scsw.dstat & DEV_STAT_UNIT_CHECK)) {
372                 cdev->private->irb.esw.esw0.erw.cons = 1;
373                 cdev->private->flags.dosense = 0;
374                 return 0;
375         }
376         if (cdev->private->flags.dosense) {
377                 ccw_device_do_sense(cdev, irb);
378                 return -EBUSY;
379         }
380         return 0;
381 }
382