Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/chsc.c | |
3 | * S/390 common I/O routines -- channel subsystem call | |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, | |
6 | * IBM Corporation | |
7 | * Author(s): Ingo Adlung (adlung@de.ibm.com) | |
4ce3b30c | 8 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
9 | * Arnd Bergmann (arndb@de.ibm.com) |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
1da177e4 LT |
13 | #include <linux/slab.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/device.h> | |
16 | ||
17 | #include <asm/cio.h> | |
18 | ||
19 | #include "css.h" | |
20 | #include "cio.h" | |
21 | #include "cio_debug.h" | |
22 | #include "ioasm.h" | |
f86635fa | 23 | #include "chpid.h" |
1da177e4 LT |
24 | #include "chsc.h" |
25 | ||
1da177e4 LT |
26 | static void *sei_page; |
27 | ||
f86635fa | 28 | static int new_channel_path(struct chp_id chpid); |
1da177e4 | 29 | |
f86635fa | 30 | static inline struct channel_path *chpid_to_chp(struct chp_id chpid) |
1da177e4 | 31 | { |
f86635fa | 32 | return css[chpid.cssid]->chps[chpid.id]; |
1da177e4 LT |
33 | } |
34 | ||
f86635fa | 35 | static void set_chp_logically_online(struct chp_id chpid, int onoff) |
1da177e4 | 36 | { |
f86635fa | 37 | chpid_to_chp(chpid)->state = onoff; |
1da177e4 LT |
38 | } |
39 | ||
f86635fa PO |
40 | static int get_chp_status(struct chp_id chpid) |
41 | { | |
42 | return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV); | |
43 | } | |
44 | ||
45 | void chsc_validate_chpids(struct subchannel *sch) | |
1da177e4 LT |
46 | { |
47 | int mask, chp; | |
f86635fa | 48 | struct chp_id chpid; |
1da177e4 | 49 | |
f86635fa | 50 | chp_id_init(&chpid); |
1da177e4 LT |
51 | for (chp = 0; chp <= 7; chp++) { |
52 | mask = 0x80 >> chp; | |
f86635fa PO |
53 | chpid.id = sch->schib.pmcw.chpid[chp]; |
54 | if (!get_chp_status(chpid)) | |
1da177e4 LT |
55 | /* disable using this path */ |
56 | sch->opm &= ~mask; | |
57 | } | |
58 | } | |
59 | ||
f86635fa | 60 | void chpid_is_actually_online(struct chp_id chpid) |
1da177e4 LT |
61 | { |
62 | int state; | |
63 | ||
f86635fa | 64 | state = get_chp_status(chpid); |
1da177e4 LT |
65 | if (state < 0) { |
66 | need_rescan = 1; | |
67 | queue_work(slow_path_wq, &slow_path_work); | |
68 | } else | |
69 | WARN_ON(!state); | |
70 | } | |
71 | ||
72 | /* FIXME: this is _always_ called for every subchannel. shouldn't we | |
73 | * process more than one at a time? */ | |
74 | static int | |
75 | chsc_get_sch_desc_irq(struct subchannel *sch, void *page) | |
76 | { | |
77 | int ccode, j; | |
78 | ||
79 | struct { | |
80 | struct chsc_header request; | |
fb6958a5 CH |
81 | u16 reserved1a:10; |
82 | u16 ssid:2; | |
83 | u16 reserved1b:4; | |
1da177e4 LT |
84 | u16 f_sch; /* first subchannel */ |
85 | u16 reserved2; | |
86 | u16 l_sch; /* last subchannel */ | |
87 | u32 reserved3; | |
88 | struct chsc_header response; | |
89 | u32 reserved4; | |
90 | u8 sch_valid : 1; | |
91 | u8 dev_valid : 1; | |
92 | u8 st : 3; /* subchannel type */ | |
93 | u8 zeroes : 3; | |
94 | u8 unit_addr; /* unit address */ | |
95 | u16 devno; /* device number */ | |
96 | u8 path_mask; | |
97 | u8 fla_valid_mask; | |
98 | u16 sch; /* subchannel */ | |
99 | u8 chpid[8]; /* chpids 0-7 */ | |
100 | u16 fla[8]; /* full link addresses 0-7 */ | |
0f008aa3 | 101 | } __attribute__ ((packed)) *ssd_area; |
1da177e4 LT |
102 | |
103 | ssd_area = page; | |
104 | ||
495a5b45 CH |
105 | ssd_area->request.length = 0x0010; |
106 | ssd_area->request.code = 0x0004; | |
1da177e4 | 107 | |
fb6958a5 | 108 | ssd_area->ssid = sch->schid.ssid; |
a8237fc4 CH |
109 | ssd_area->f_sch = sch->schid.sch_no; |
110 | ssd_area->l_sch = sch->schid.sch_no; | |
1da177e4 LT |
111 | |
112 | ccode = chsc(ssd_area); | |
113 | if (ccode > 0) { | |
114 | pr_debug("chsc returned with ccode = %d\n", ccode); | |
115 | return (ccode == 3) ? -ENODEV : -EBUSY; | |
116 | } | |
117 | ||
118 | switch (ssd_area->response.code) { | |
119 | case 0x0001: /* everything ok */ | |
120 | break; | |
121 | case 0x0002: | |
122 | CIO_CRW_EVENT(2, "Invalid command!\n"); | |
123 | return -EINVAL; | |
124 | case 0x0003: | |
125 | CIO_CRW_EVENT(2, "Error in chsc request block!\n"); | |
126 | return -EINVAL; | |
127 | case 0x0004: | |
128 | CIO_CRW_EVENT(2, "Model does not provide ssd\n"); | |
129 | return -EOPNOTSUPP; | |
130 | default: | |
131 | CIO_CRW_EVENT(2, "Unknown CHSC response %d\n", | |
132 | ssd_area->response.code); | |
133 | return -EIO; | |
134 | } | |
135 | ||
136 | /* | |
137 | * ssd_area->st stores the type of the detected | |
138 | * subchannel, with the following definitions: | |
139 | * | |
140 | * 0: I/O subchannel: All fields have meaning | |
141 | * 1: CHSC subchannel: Only sch_val, st and sch | |
142 | * have meaning | |
143 | * 2: Message subchannel: All fields except unit_addr | |
144 | * have meaning | |
145 | * 3: ADM subchannel: Only sch_val, st and sch | |
146 | * have meaning | |
147 | * | |
148 | * Other types are currently undefined. | |
149 | */ | |
150 | if (ssd_area->st > 3) { /* uhm, that looks strange... */ | |
151 | CIO_CRW_EVENT(0, "Strange subchannel type %d" | |
fb6958a5 CH |
152 | " for sch 0.%x.%04x\n", ssd_area->st, |
153 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
154 | /* |
155 | * There may have been a new subchannel type defined in the | |
156 | * time since this code was written; since we don't know which | |
157 | * fields have meaning and what to do with it we just jump out | |
158 | */ | |
159 | return 0; | |
160 | } else { | |
161 | const char *type[4] = {"I/O", "chsc", "message", "ADM"}; | |
fb6958a5 CH |
162 | CIO_CRW_EVENT(6, "ssd: sch 0.%x.%04x is %s subchannel\n", |
163 | sch->schid.ssid, sch->schid.sch_no, | |
164 | type[ssd_area->st]); | |
1da177e4 LT |
165 | |
166 | sch->ssd_info.valid = 1; | |
167 | sch->ssd_info.type = ssd_area->st; | |
168 | } | |
169 | ||
170 | if (ssd_area->st == 0 || ssd_area->st == 2) { | |
171 | for (j = 0; j < 8; j++) { | |
172 | if (!((0x80 >> j) & ssd_area->path_mask & | |
173 | ssd_area->fla_valid_mask)) | |
174 | continue; | |
175 | sch->ssd_info.chpid[j] = ssd_area->chpid[j]; | |
176 | sch->ssd_info.fla[j] = ssd_area->fla[j]; | |
177 | } | |
178 | } | |
179 | return 0; | |
180 | } | |
181 | ||
182 | int | |
183 | css_get_ssd_info(struct subchannel *sch) | |
184 | { | |
185 | int ret; | |
186 | void *page; | |
187 | ||
188 | page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
189 | if (!page) | |
190 | return -ENOMEM; | |
2ec22984 | 191 | spin_lock_irq(sch->lock); |
1da177e4 LT |
192 | ret = chsc_get_sch_desc_irq(sch, page); |
193 | if (ret) { | |
194 | static int cio_chsc_err_msg; | |
195 | ||
196 | if (!cio_chsc_err_msg) { | |
197 | printk(KERN_ERR | |
198 | "chsc_get_sch_descriptions:" | |
199 | " Error %d while doing chsc; " | |
200 | "processing some machine checks may " | |
201 | "not work\n", ret); | |
202 | cio_chsc_err_msg = 1; | |
203 | } | |
204 | } | |
2ec22984 | 205 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
206 | free_page((unsigned long)page); |
207 | if (!ret) { | |
f86635fa PO |
208 | int j, mask; |
209 | struct chp_id chpid; | |
210 | ||
211 | chp_id_init(&chpid); | |
1da177e4 LT |
212 | /* Allocate channel path structures, if needed. */ |
213 | for (j = 0; j < 8; j++) { | |
7e8ae7bf | 214 | mask = 0x80 >> j; |
f86635fa | 215 | chpid.id = sch->ssd_info.chpid[j]; |
7e8ae7bf CH |
216 | if ((sch->schib.pmcw.pim & mask) && |
217 | (get_chp_status(chpid) < 0)) | |
1da177e4 LT |
218 | new_channel_path(chpid); |
219 | } | |
220 | } | |
221 | return ret; | |
222 | } | |
223 | ||
224 | static int | |
225 | s390_subchannel_remove_chpid(struct device *dev, void *data) | |
226 | { | |
227 | int j; | |
228 | int mask; | |
229 | struct subchannel *sch; | |
a28c6944 | 230 | struct channel_path *chpid; |
1da177e4 LT |
231 | struct schib schib; |
232 | ||
233 | sch = to_subchannel(dev); | |
234 | chpid = data; | |
7e8ae7bf CH |
235 | for (j = 0; j < 8; j++) { |
236 | mask = 0x80 >> j; | |
237 | if ((sch->schib.pmcw.pim & mask) && | |
f86635fa | 238 | (sch->schib.pmcw.chpid[j] == chpid->chpid.id)) |
1da177e4 | 239 | break; |
7e8ae7bf | 240 | } |
1da177e4 LT |
241 | if (j >= 8) |
242 | return 0; | |
243 | ||
2ec22984 | 244 | spin_lock_irq(sch->lock); |
1da177e4 | 245 | |
a8237fc4 | 246 | stsch(sch->schid, &schib); |
1da177e4 LT |
247 | if (!schib.pmcw.dnv) |
248 | goto out_unreg; | |
249 | memcpy(&sch->schib, &schib, sizeof(struct schib)); | |
250 | /* Check for single path devices. */ | |
251 | if (sch->schib.pmcw.pim == 0x80) | |
252 | goto out_unreg; | |
1da177e4 | 253 | |
329b785b PO |
254 | if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) && |
255 | (sch->schib.scsw.actl & SCSW_ACTL_SCHACT) && | |
b4f7b1ee | 256 | (sch->schib.pmcw.lpum == mask)) { |
1da177e4 LT |
257 | int cc; |
258 | ||
259 | cc = cio_clear(sch); | |
260 | if (cc == -ENODEV) | |
261 | goto out_unreg; | |
d23861ff CH |
262 | /* Request retry of internal operation. */ |
263 | device_set_intretry(sch); | |
1da177e4 LT |
264 | /* Call handler. */ |
265 | if (sch->driver && sch->driver->termination) | |
266 | sch->driver->termination(&sch->dev); | |
267 | goto out_unlock; | |
268 | } | |
269 | ||
270 | /* trigger path verification. */ | |
271 | if (sch->driver && sch->driver->verify) | |
272 | sch->driver->verify(&sch->dev); | |
28bdc6f6 | 273 | else if (sch->lpm == mask) |
3b88508a | 274 | goto out_unreg; |
1da177e4 | 275 | out_unlock: |
2ec22984 | 276 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
277 | return 0; |
278 | out_unreg: | |
2ec22984 | 279 | spin_unlock_irq(sch->lock); |
1da177e4 | 280 | sch->lpm = 0; |
a8237fc4 | 281 | if (css_enqueue_subchannel_slow(sch->schid)) { |
1da177e4 LT |
282 | css_clear_subchannel_slow_list(); |
283 | need_rescan = 1; | |
284 | } | |
285 | return 0; | |
286 | } | |
287 | ||
f86635fa | 288 | static void s390_set_chpid_offline(struct chp_id chpid) |
1da177e4 LT |
289 | { |
290 | char dbf_txt[15]; | |
a28c6944 | 291 | struct device *dev; |
1da177e4 | 292 | |
f86635fa | 293 | sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id); |
1da177e4 LT |
294 | CIO_TRACE_EVENT(2, dbf_txt); |
295 | ||
296 | if (get_chp_status(chpid) <= 0) | |
297 | return; | |
f86635fa | 298 | dev = get_device(&(chpid_to_chp(chpid)->dev)); |
a28c6944 | 299 | bus_for_each_dev(&css_bus_type, NULL, to_channelpath(dev), |
1da177e4 LT |
300 | s390_subchannel_remove_chpid); |
301 | ||
302 | if (need_rescan || css_slow_subchannels_exist()) | |
303 | queue_work(slow_path_wq, &slow_path_work); | |
a28c6944 | 304 | put_device(dev); |
1da177e4 LT |
305 | } |
306 | ||
f97a56fb CH |
307 | struct res_acc_data { |
308 | struct channel_path *chp; | |
309 | u32 fla_mask; | |
310 | u16 fla; | |
311 | }; | |
312 | ||
1da177e4 | 313 | static int |
f97a56fb | 314 | s390_process_res_acc_sch(struct res_acc_data *res_data, struct subchannel *sch) |
1da177e4 LT |
315 | { |
316 | int found; | |
317 | int chp; | |
318 | int ccode; | |
319 | ||
320 | found = 0; | |
321 | for (chp = 0; chp <= 7; chp++) | |
322 | /* | |
323 | * check if chpid is in information updated by ssd | |
324 | */ | |
325 | if (sch->ssd_info.valid && | |
f86635fa | 326 | sch->ssd_info.chpid[chp] == res_data->chp->chpid.id && |
f97a56fb CH |
327 | (sch->ssd_info.fla[chp] & res_data->fla_mask) |
328 | == res_data->fla) { | |
1da177e4 LT |
329 | found = 1; |
330 | break; | |
331 | } | |
332 | ||
333 | if (found == 0) | |
334 | return 0; | |
335 | ||
336 | /* | |
337 | * Do a stsch to update our subchannel structure with the | |
338 | * new path information and eventually check for logically | |
339 | * offline chpids. | |
340 | */ | |
a8237fc4 | 341 | ccode = stsch(sch->schid, &sch->schib); |
1da177e4 LT |
342 | if (ccode > 0) |
343 | return 0; | |
344 | ||
345 | return 0x80 >> chp; | |
346 | } | |
347 | ||
4d284cac | 348 | static int |
f97a56fb CH |
349 | s390_process_res_acc_new_sch(struct subchannel_id schid) |
350 | { | |
351 | struct schib schib; | |
352 | int ret; | |
353 | /* | |
354 | * We don't know the device yet, but since a path | |
355 | * may be available now to the device we'll have | |
356 | * to do recognition again. | |
357 | * Since we don't have any idea about which chpid | |
358 | * that beast may be on we'll have to do a stsch | |
359 | * on all devices, grr... | |
360 | */ | |
fb6958a5 | 361 | if (stsch_err(schid, &schib)) |
f97a56fb CH |
362 | /* We're through */ |
363 | return need_rescan ? -EAGAIN : -ENXIO; | |
364 | ||
365 | /* Put it on the slow path. */ | |
366 | ret = css_enqueue_subchannel_slow(schid); | |
367 | if (ret) { | |
368 | css_clear_subchannel_slow_list(); | |
369 | need_rescan = 1; | |
370 | return -EAGAIN; | |
371 | } | |
372 | return 0; | |
373 | } | |
374 | ||
1da177e4 | 375 | static int |
f97a56fb | 376 | __s390_process_res_acc(struct subchannel_id schid, void *data) |
1da177e4 | 377 | { |
f97a56fb CH |
378 | int chp_mask, old_lpm; |
379 | struct res_acc_data *res_data; | |
1da177e4 | 380 | struct subchannel *sch; |
f97a56fb | 381 | |
12975aef | 382 | res_data = data; |
f97a56fb CH |
383 | sch = get_subchannel_by_schid(schid); |
384 | if (!sch) | |
385 | /* Check if a subchannel is newly available. */ | |
386 | return s390_process_res_acc_new_sch(schid); | |
387 | ||
2ec22984 | 388 | spin_lock_irq(sch->lock); |
f97a56fb CH |
389 | |
390 | chp_mask = s390_process_res_acc_sch(res_data, sch); | |
391 | ||
392 | if (chp_mask == 0) { | |
2ec22984 | 393 | spin_unlock_irq(sch->lock); |
dd9963f9 | 394 | put_device(&sch->dev); |
f97a56fb CH |
395 | return 0; |
396 | } | |
397 | old_lpm = sch->lpm; | |
398 | sch->lpm = ((sch->schib.pmcw.pim & | |
399 | sch->schib.pmcw.pam & | |
400 | sch->schib.pmcw.pom) | |
401 | | chp_mask) & sch->opm; | |
402 | if (!old_lpm && sch->lpm) | |
403 | device_trigger_reprobe(sch); | |
404 | else if (sch->driver && sch->driver->verify) | |
405 | sch->driver->verify(&sch->dev); | |
406 | ||
2ec22984 | 407 | spin_unlock_irq(sch->lock); |
f97a56fb | 408 | put_device(&sch->dev); |
dd9963f9 | 409 | return 0; |
f97a56fb CH |
410 | } |
411 | ||
412 | ||
413 | static int | |
414 | s390_process_res_acc (struct res_acc_data *res_data) | |
415 | { | |
a8237fc4 | 416 | int rc; |
1da177e4 LT |
417 | char dbf_txt[15]; |
418 | ||
f86635fa PO |
419 | sprintf(dbf_txt, "accpr%x.%02x", res_data->chp->chpid.cssid, |
420 | res_data->chp->chpid.id); | |
1da177e4 | 421 | CIO_TRACE_EVENT( 2, dbf_txt); |
f97a56fb CH |
422 | if (res_data->fla != 0) { |
423 | sprintf(dbf_txt, "fla%x", res_data->fla); | |
1da177e4 LT |
424 | CIO_TRACE_EVENT( 2, dbf_txt); |
425 | } | |
426 | ||
427 | /* | |
428 | * I/O resources may have become accessible. | |
429 | * Scan through all subchannels that may be concerned and | |
430 | * do a validation on those. | |
431 | * The more information we have (info), the less scanning | |
432 | * will we have to do. | |
433 | */ | |
f97a56fb CH |
434 | rc = for_each_subchannel(__s390_process_res_acc, res_data); |
435 | if (css_slow_subchannels_exist()) | |
436 | rc = -EAGAIN; | |
437 | else if (rc != -EAGAIN) | |
438 | rc = 0; | |
1da177e4 LT |
439 | return rc; |
440 | } | |
441 | ||
442 | static int | |
443 | __get_chpid_from_lir(void *data) | |
444 | { | |
445 | struct lir { | |
446 | u8 iq; | |
447 | u8 ic; | |
448 | u16 sci; | |
449 | /* incident-node descriptor */ | |
450 | u32 indesc[28]; | |
451 | /* attached-node descriptor */ | |
452 | u32 andesc[28]; | |
453 | /* incident-specific information */ | |
454 | u32 isinfo[28]; | |
0f008aa3 | 455 | } __attribute__ ((packed)) *lir; |
1da177e4 | 456 | |
12975aef | 457 | lir = data; |
1da177e4 LT |
458 | if (!(lir->iq&0x80)) |
459 | /* NULL link incident record */ | |
460 | return -EINVAL; | |
461 | if (!(lir->indesc[0]&0xc0000000)) | |
462 | /* node descriptor not valid */ | |
463 | return -EINVAL; | |
464 | if (!(lir->indesc[0]&0x10000000)) | |
465 | /* don't handle device-type nodes - FIXME */ | |
466 | return -EINVAL; | |
467 | /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */ | |
468 | ||
469 | return (u16) (lir->indesc[0]&0x000000ff); | |
470 | } | |
471 | ||
184357a5 PO |
472 | struct chsc_sei_area { |
473 | struct chsc_header request; | |
474 | u32 reserved1; | |
475 | u32 reserved2; | |
476 | u32 reserved3; | |
477 | struct chsc_header response; | |
478 | u32 reserved4; | |
479 | u8 flags; | |
480 | u8 vf; /* validity flags */ | |
481 | u8 rs; /* reporting source */ | |
482 | u8 cc; /* content code */ | |
483 | u16 fla; /* full link address */ | |
484 | u16 rsid; /* reporting source id */ | |
485 | u32 reserved5; | |
486 | u32 reserved6; | |
487 | u8 ccdf[4096 - 16 - 24]; /* content-code dependent field */ | |
488 | /* ccdf has to be big enough for a link-incident record */ | |
489 | } __attribute__ ((packed)); | |
490 | ||
491 | static int chsc_process_sei_link_incident(struct chsc_sei_area *sei_area) | |
492 | { | |
f86635fa PO |
493 | struct chp_id chpid; |
494 | int id; | |
184357a5 PO |
495 | |
496 | CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n", | |
497 | sei_area->rs, sei_area->rsid); | |
498 | if (sei_area->rs != 4) | |
499 | return 0; | |
f86635fa PO |
500 | id = __get_chpid_from_lir(sei_area->ccdf); |
501 | if (id < 0) | |
184357a5 | 502 | CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n"); |
f86635fa PO |
503 | else { |
504 | chp_id_init(&chpid); | |
505 | chpid.id = id; | |
184357a5 | 506 | s390_set_chpid_offline(chpid); |
f86635fa | 507 | } |
184357a5 PO |
508 | |
509 | return 0; | |
510 | } | |
511 | ||
512 | static int chsc_process_sei_res_acc(struct chsc_sei_area *sei_area) | |
1da177e4 | 513 | { |
f97a56fb | 514 | struct res_acc_data res_data; |
184357a5 | 515 | struct device *dev; |
f86635fa | 516 | struct chp_id chpid; |
184357a5 PO |
517 | int status; |
518 | int rc; | |
519 | ||
520 | CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, " | |
521 | "rs_id=%04x)\n", sei_area->rs, sei_area->rsid); | |
522 | if (sei_area->rs != 4) | |
523 | return 0; | |
f86635fa PO |
524 | chp_id_init(&chpid); |
525 | chpid.id = sei_area->rsid; | |
184357a5 | 526 | /* allocate a new channel path structure, if needed */ |
f86635fa | 527 | status = get_chp_status(chpid); |
184357a5 | 528 | if (status < 0) |
f86635fa | 529 | new_channel_path(chpid); |
184357a5 PO |
530 | else if (!status) |
531 | return 0; | |
f86635fa | 532 | dev = get_device(&(chpid_to_chp(chpid)->dev)); |
184357a5 PO |
533 | memset(&res_data, 0, sizeof(struct res_acc_data)); |
534 | res_data.chp = to_channelpath(dev); | |
535 | if ((sei_area->vf & 0xc0) != 0) { | |
536 | res_data.fla = sei_area->fla; | |
537 | if ((sei_area->vf & 0xc0) == 0xc0) | |
538 | /* full link address */ | |
539 | res_data.fla_mask = 0xffff; | |
540 | else | |
541 | /* link address */ | |
542 | res_data.fla_mask = 0xff00; | |
543 | } | |
544 | rc = s390_process_res_acc(&res_data); | |
545 | put_device(dev); | |
546 | ||
547 | return rc; | |
548 | } | |
549 | ||
550 | static int chsc_process_sei(struct chsc_sei_area *sei_area) | |
551 | { | |
552 | int rc; | |
553 | ||
554 | /* Check if we might have lost some information. */ | |
555 | if (sei_area->flags & 0x40) | |
556 | CIO_CRW_EVENT(2, "chsc: event overflow\n"); | |
557 | /* which kind of information was stored? */ | |
558 | rc = 0; | |
559 | switch (sei_area->cc) { | |
560 | case 1: /* link incident*/ | |
561 | rc = chsc_process_sei_link_incident(sei_area); | |
562 | break; | |
563 | case 2: /* i/o resource accessibiliy */ | |
564 | rc = chsc_process_sei_res_acc(sei_area); | |
565 | break; | |
566 | default: /* other stuff */ | |
567 | CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n", | |
568 | sei_area->cc); | |
569 | break; | |
570 | } | |
571 | ||
572 | return rc; | |
573 | } | |
574 | ||
575 | int chsc_process_crw(void) | |
576 | { | |
577 | struct chsc_sei_area *sei_area; | |
578 | int ret; | |
579 | int rc; | |
1da177e4 LT |
580 | |
581 | if (!sei_page) | |
582 | return 0; | |
184357a5 PO |
583 | /* Access to sei_page is serialized through machine check handler |
584 | * thread, so no need for locking. */ | |
1da177e4 LT |
585 | sei_area = sei_page; |
586 | ||
587 | CIO_TRACE_EVENT( 2, "prcss"); | |
588 | ret = 0; | |
589 | do { | |
1da177e4 | 590 | memset(sei_area, 0, sizeof(*sei_area)); |
495a5b45 CH |
591 | sei_area->request.length = 0x0010; |
592 | sei_area->request.code = 0x000e; | |
184357a5 PO |
593 | if (chsc(sei_area)) |
594 | break; | |
1da177e4 | 595 | |
184357a5 PO |
596 | if (sei_area->response.code == 0x0001) { |
597 | CIO_CRW_EVENT(4, "chsc: sei successful\n"); | |
598 | rc = chsc_process_sei(sei_area); | |
599 | if (rc) | |
600 | ret = rc; | |
601 | } else { | |
602 | CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n", | |
1da177e4 | 603 | sei_area->response.code); |
184357a5 | 604 | ret = 0; |
1da177e4 LT |
605 | break; |
606 | } | |
607 | } while (sei_area->flags & 0x80); | |
184357a5 | 608 | |
1da177e4 LT |
609 | return ret; |
610 | } | |
611 | ||
4d284cac | 612 | static int |
f97a56fb CH |
613 | __chp_add_new_sch(struct subchannel_id schid) |
614 | { | |
615 | struct schib schib; | |
616 | int ret; | |
617 | ||
758976f9 | 618 | if (stsch_err(schid, &schib)) |
f97a56fb CH |
619 | /* We're through */ |
620 | return need_rescan ? -EAGAIN : -ENXIO; | |
621 | ||
622 | /* Put it on the slow path. */ | |
623 | ret = css_enqueue_subchannel_slow(schid); | |
624 | if (ret) { | |
625 | css_clear_subchannel_slow_list(); | |
626 | need_rescan = 1; | |
627 | return -EAGAIN; | |
628 | } | |
629 | return 0; | |
630 | } | |
631 | ||
632 | ||
1da177e4 | 633 | static int |
f97a56fb | 634 | __chp_add(struct subchannel_id schid, void *data) |
1da177e4 | 635 | { |
7e8ae7bf | 636 | int i, mask; |
f97a56fb | 637 | struct channel_path *chp; |
1da177e4 | 638 | struct subchannel *sch; |
f97a56fb | 639 | |
12975aef | 640 | chp = data; |
f97a56fb CH |
641 | sch = get_subchannel_by_schid(schid); |
642 | if (!sch) | |
643 | /* Check if the subchannel is now available. */ | |
644 | return __chp_add_new_sch(schid); | |
2ec22984 | 645 | spin_lock_irq(sch->lock); |
7e8ae7bf CH |
646 | for (i=0; i<8; i++) { |
647 | mask = 0x80 >> i; | |
648 | if ((sch->schib.pmcw.pim & mask) && | |
f86635fa | 649 | (sch->schib.pmcw.chpid[i] == chp->chpid.id)) { |
f97a56fb CH |
650 | if (stsch(sch->schid, &sch->schib) != 0) { |
651 | /* Endgame. */ | |
2ec22984 | 652 | spin_unlock_irq(sch->lock); |
f97a56fb CH |
653 | return -ENXIO; |
654 | } | |
655 | break; | |
656 | } | |
7e8ae7bf | 657 | } |
f97a56fb | 658 | if (i==8) { |
2ec22984 | 659 | spin_unlock_irq(sch->lock); |
f97a56fb CH |
660 | return 0; |
661 | } | |
662 | sch->lpm = ((sch->schib.pmcw.pim & | |
663 | sch->schib.pmcw.pam & | |
664 | sch->schib.pmcw.pom) | |
7e8ae7bf | 665 | | mask) & sch->opm; |
f97a56fb CH |
666 | |
667 | if (sch->driver && sch->driver->verify) | |
668 | sch->driver->verify(&sch->dev); | |
669 | ||
2ec22984 | 670 | spin_unlock_irq(sch->lock); |
f97a56fb CH |
671 | put_device(&sch->dev); |
672 | return 0; | |
673 | } | |
674 | ||
f86635fa | 675 | static int chp_add(struct chp_id chpid) |
f97a56fb CH |
676 | { |
677 | int rc; | |
1da177e4 | 678 | char dbf_txt[15]; |
a28c6944 | 679 | struct device *dev; |
1da177e4 LT |
680 | |
681 | if (!get_chp_status(chpid)) | |
682 | return 0; /* no need to do the rest */ | |
683 | ||
f86635fa | 684 | sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id); |
1da177e4 LT |
685 | CIO_TRACE_EVENT(2, dbf_txt); |
686 | ||
f86635fa | 687 | dev = get_device(&(chpid_to_chp(chpid)->dev)); |
a28c6944 | 688 | rc = for_each_subchannel(__chp_add, to_channelpath(dev)); |
f97a56fb CH |
689 | if (css_slow_subchannels_exist()) |
690 | rc = -EAGAIN; | |
691 | if (rc != -EAGAIN) | |
692 | rc = 0; | |
a28c6944 | 693 | put_device(dev); |
1da177e4 LT |
694 | return rc; |
695 | } | |
696 | ||
697 | /* | |
698 | * Handling of crw machine checks with channel path source. | |
699 | */ | |
f86635fa | 700 | int chp_process_crw(int id, int on) |
1da177e4 | 701 | { |
f86635fa PO |
702 | struct chp_id chpid; |
703 | ||
704 | chp_id_init(&chpid); | |
705 | chpid.id = id; | |
1da177e4 LT |
706 | if (on == 0) { |
707 | /* Path has gone. We use the link incident routine.*/ | |
708 | s390_set_chpid_offline(chpid); | |
709 | return 0; /* De-register is async anyway. */ | |
710 | } | |
711 | /* | |
712 | * Path has come. Allocate a new channel path structure, | |
713 | * if needed. | |
714 | */ | |
715 | if (get_chp_status(chpid) < 0) | |
716 | new_channel_path(chpid); | |
717 | /* Avoid the extra overhead in process_rec_acc. */ | |
718 | return chp_add(chpid); | |
719 | } | |
720 | ||
4d284cac | 721 | static int check_for_io_on_path(struct subchannel *sch, int index) |
1da177e4 LT |
722 | { |
723 | int cc; | |
724 | ||
a8237fc4 | 725 | cc = stsch(sch->schid, &sch->schib); |
1da177e4 LT |
726 | if (cc) |
727 | return 0; | |
e7769b48 | 728 | if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == (0x80 >> index)) |
1da177e4 | 729 | return 1; |
1da177e4 LT |
730 | return 0; |
731 | } | |
732 | ||
d23861ff CH |
733 | static void terminate_internal_io(struct subchannel *sch) |
734 | { | |
735 | if (cio_clear(sch)) { | |
736 | /* Recheck device in case clear failed. */ | |
737 | sch->lpm = 0; | |
738 | if (device_trigger_verify(sch) != 0) { | |
739 | if(css_enqueue_subchannel_slow(sch->schid)) { | |
740 | css_clear_subchannel_slow_list(); | |
741 | need_rescan = 1; | |
742 | } | |
743 | } | |
744 | return; | |
745 | } | |
746 | /* Request retry of internal operation. */ | |
747 | device_set_intretry(sch); | |
748 | /* Call handler. */ | |
749 | if (sch->driver && sch->driver->termination) | |
750 | sch->driver->termination(&sch->dev); | |
751 | } | |
752 | ||
f86635fa PO |
753 | static void __s390_subchannel_vary_chpid(struct subchannel *sch, |
754 | struct chp_id chpid, int on) | |
1da177e4 LT |
755 | { |
756 | int chp, old_lpm; | |
757 | unsigned long flags; | |
758 | ||
759 | if (!sch->ssd_info.valid) | |
760 | return; | |
761 | ||
2ec22984 | 762 | spin_lock_irqsave(sch->lock, flags); |
1da177e4 LT |
763 | old_lpm = sch->lpm; |
764 | for (chp = 0; chp < 8; chp++) { | |
f86635fa | 765 | if (sch->ssd_info.chpid[chp] != chpid.id) |
1da177e4 LT |
766 | continue; |
767 | ||
768 | if (on) { | |
769 | sch->opm |= (0x80 >> chp); | |
770 | sch->lpm |= (0x80 >> chp); | |
771 | if (!old_lpm) | |
772 | device_trigger_reprobe(sch); | |
773 | else if (sch->driver && sch->driver->verify) | |
774 | sch->driver->verify(&sch->dev); | |
24cb5b48 CH |
775 | break; |
776 | } | |
777 | sch->opm &= ~(0x80 >> chp); | |
778 | sch->lpm &= ~(0x80 >> chp); | |
d23861ff CH |
779 | if (check_for_io_on_path(sch, chp)) { |
780 | if (device_is_online(sch)) | |
781 | /* Path verification is done after killing. */ | |
782 | device_kill_io(sch); | |
783 | else | |
784 | /* Kill and retry internal I/O. */ | |
785 | terminate_internal_io(sch); | |
786 | } else if (!sch->lpm) { | |
24cb5b48 | 787 | if (device_trigger_verify(sch) != 0) { |
a8237fc4 | 788 | if (css_enqueue_subchannel_slow(sch->schid)) { |
1da177e4 LT |
789 | css_clear_subchannel_slow_list(); |
790 | need_rescan = 1; | |
791 | } | |
24cb5b48 CH |
792 | } |
793 | } else if (sch->driver && sch->driver->verify) | |
794 | sch->driver->verify(&sch->dev); | |
1da177e4 LT |
795 | break; |
796 | } | |
2ec22984 | 797 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
798 | } |
799 | ||
f86635fa | 800 | static int s390_subchannel_vary_chpid_off(struct device *dev, void *data) |
1da177e4 LT |
801 | { |
802 | struct subchannel *sch; | |
f86635fa | 803 | struct chp_id *chpid; |
1da177e4 LT |
804 | |
805 | sch = to_subchannel(dev); | |
806 | chpid = data; | |
807 | ||
808 | __s390_subchannel_vary_chpid(sch, *chpid, 0); | |
809 | return 0; | |
810 | } | |
811 | ||
f86635fa | 812 | static int s390_subchannel_vary_chpid_on(struct device *dev, void *data) |
1da177e4 LT |
813 | { |
814 | struct subchannel *sch; | |
f86635fa | 815 | struct chp_id *chpid; |
1da177e4 LT |
816 | |
817 | sch = to_subchannel(dev); | |
818 | chpid = data; | |
819 | ||
820 | __s390_subchannel_vary_chpid(sch, *chpid, 1); | |
821 | return 0; | |
822 | } | |
823 | ||
f97a56fb CH |
824 | static int |
825 | __s390_vary_chpid_on(struct subchannel_id schid, void *data) | |
826 | { | |
827 | struct schib schib; | |
828 | struct subchannel *sch; | |
829 | ||
830 | sch = get_subchannel_by_schid(schid); | |
831 | if (sch) { | |
832 | put_device(&sch->dev); | |
833 | return 0; | |
834 | } | |
fb6958a5 | 835 | if (stsch_err(schid, &schib)) |
f97a56fb CH |
836 | /* We're through */ |
837 | return -ENXIO; | |
838 | /* Put it on the slow path. */ | |
839 | if (css_enqueue_subchannel_slow(schid)) { | |
840 | css_clear_subchannel_slow_list(); | |
841 | need_rescan = 1; | |
842 | return -EAGAIN; | |
843 | } | |
844 | return 0; | |
845 | } | |
846 | ||
1da177e4 LT |
847 | /* |
848 | * Function: s390_vary_chpid | |
849 | * Varies the specified chpid online or offline | |
850 | */ | |
f86635fa | 851 | static int s390_vary_chpid(struct chp_id chpid, int on) |
1da177e4 LT |
852 | { |
853 | char dbf_text[15]; | |
f97a56fb | 854 | int status; |
1da177e4 | 855 | |
f86635fa PO |
856 | sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, |
857 | chpid.id); | |
1da177e4 LT |
858 | CIO_TRACE_EVENT( 2, dbf_text); |
859 | ||
860 | status = get_chp_status(chpid); | |
861 | if (status < 0) { | |
f86635fa PO |
862 | printk(KERN_ERR "Can't vary unknown chpid %x.%02x\n", |
863 | chpid.cssid, chpid.id); | |
1da177e4 LT |
864 | return -EINVAL; |
865 | } | |
866 | ||
867 | if (!on && !status) { | |
f86635fa PO |
868 | printk(KERN_ERR "chpid %x.%02x is already offline\n", |
869 | chpid.cssid, chpid.id); | |
1da177e4 LT |
870 | return -EINVAL; |
871 | } | |
872 | ||
873 | set_chp_logically_online(chpid, on); | |
874 | ||
875 | /* | |
876 | * Redo PathVerification on the devices the chpid connects to | |
877 | */ | |
878 | ||
879 | bus_for_each_dev(&css_bus_type, NULL, &chpid, on ? | |
880 | s390_subchannel_vary_chpid_on : | |
881 | s390_subchannel_vary_chpid_off); | |
f97a56fb CH |
882 | if (on) |
883 | /* Scan for new devices on varied on path. */ | |
884 | for_each_subchannel(__s390_vary_chpid_on, NULL); | |
1da177e4 LT |
885 | if (need_rescan || css_slow_subchannels_exist()) |
886 | queue_work(slow_path_wq, &slow_path_work); | |
887 | return 0; | |
888 | } | |
889 | ||
495a5b45 CH |
890 | /* |
891 | * Channel measurement related functions | |
892 | */ | |
893 | static ssize_t | |
894 | chp_measurement_chars_read(struct kobject *kobj, char *buf, loff_t off, | |
895 | size_t count) | |
896 | { | |
897 | struct channel_path *chp; | |
898 | unsigned int size; | |
899 | ||
900 | chp = to_channelpath(container_of(kobj, struct device, kobj)); | |
901 | if (!chp->cmg_chars) | |
902 | return 0; | |
903 | ||
904 | size = sizeof(struct cmg_chars); | |
905 | ||
906 | if (off > size) | |
907 | return 0; | |
908 | if (off + count > size) | |
909 | count = size - off; | |
910 | memcpy(buf, chp->cmg_chars + off, count); | |
911 | return count; | |
912 | } | |
913 | ||
914 | static struct bin_attribute chp_measurement_chars_attr = { | |
915 | .attr = { | |
916 | .name = "measurement_chars", | |
917 | .mode = S_IRUSR, | |
918 | .owner = THIS_MODULE, | |
919 | }, | |
920 | .size = sizeof(struct cmg_chars), | |
921 | .read = chp_measurement_chars_read, | |
922 | }; | |
923 | ||
f86635fa PO |
924 | static void chp_measurement_copy_block(struct cmg_entry *buf, |
925 | struct channel_subsystem *css, struct chp_id chpid) | |
495a5b45 CH |
926 | { |
927 | void *area; | |
928 | struct cmg_entry *entry, reference_buf; | |
929 | int idx; | |
930 | ||
f86635fa | 931 | if (chpid.id < 128) { |
495a5b45 | 932 | area = css->cub_addr1; |
f86635fa | 933 | idx = chpid.id; |
495a5b45 CH |
934 | } else { |
935 | area = css->cub_addr2; | |
f86635fa | 936 | idx = chpid.id - 128; |
495a5b45 CH |
937 | } |
938 | entry = area + (idx * sizeof(struct cmg_entry)); | |
939 | do { | |
940 | memcpy(buf, entry, sizeof(*entry)); | |
941 | memcpy(&reference_buf, entry, sizeof(*entry)); | |
942 | } while (reference_buf.values[0] != buf->values[0]); | |
943 | } | |
944 | ||
945 | static ssize_t | |
946 | chp_measurement_read(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
947 | { | |
948 | struct channel_path *chp; | |
949 | struct channel_subsystem *css; | |
950 | unsigned int size; | |
951 | ||
952 | chp = to_channelpath(container_of(kobj, struct device, kobj)); | |
953 | css = to_css(chp->dev.parent); | |
954 | ||
231caa1c | 955 | size = sizeof(struct cmg_entry); |
495a5b45 CH |
956 | |
957 | /* Only allow single reads. */ | |
958 | if (off || count < size) | |
959 | return 0; | |
f86635fa | 960 | chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); |
231caa1c | 961 | count = size; |
495a5b45 CH |
962 | return count; |
963 | } | |
964 | ||
965 | static struct bin_attribute chp_measurement_attr = { | |
966 | .attr = { | |
967 | .name = "measurement", | |
968 | .mode = S_IRUSR, | |
969 | .owner = THIS_MODULE, | |
970 | }, | |
971 | .size = sizeof(struct cmg_entry), | |
972 | .read = chp_measurement_read, | |
973 | }; | |
974 | ||
975 | static void | |
976 | chsc_remove_chp_cmg_attr(struct channel_path *chp) | |
977 | { | |
1125b464 CH |
978 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); |
979 | device_remove_bin_file(&chp->dev, &chp_measurement_attr); | |
495a5b45 CH |
980 | } |
981 | ||
982 | static int | |
983 | chsc_add_chp_cmg_attr(struct channel_path *chp) | |
984 | { | |
985 | int ret; | |
986 | ||
1125b464 | 987 | ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); |
495a5b45 CH |
988 | if (ret) |
989 | return ret; | |
1125b464 | 990 | ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); |
495a5b45 | 991 | if (ret) |
1125b464 | 992 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); |
495a5b45 CH |
993 | return ret; |
994 | } | |
995 | ||
996 | static void | |
997 | chsc_remove_cmg_attr(struct channel_subsystem *css) | |
998 | { | |
999 | int i; | |
1000 | ||
1001 | for (i = 0; i <= __MAX_CHPID; i++) { | |
1002 | if (!css->chps[i]) | |
1003 | continue; | |
1004 | chsc_remove_chp_cmg_attr(css->chps[i]); | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | static int | |
1009 | chsc_add_cmg_attr(struct channel_subsystem *css) | |
1010 | { | |
1011 | int i, ret; | |
1012 | ||
1013 | ret = 0; | |
1014 | for (i = 0; i <= __MAX_CHPID; i++) { | |
1015 | if (!css->chps[i]) | |
1016 | continue; | |
1017 | ret = chsc_add_chp_cmg_attr(css->chps[i]); | |
1018 | if (ret) | |
1019 | goto cleanup; | |
1020 | } | |
1021 | return ret; | |
1022 | cleanup: | |
1023 | for (--i; i >= 0; i--) { | |
1024 | if (!css->chps[i]) | |
1025 | continue; | |
1026 | chsc_remove_chp_cmg_attr(css->chps[i]); | |
1027 | } | |
1028 | return ret; | |
1029 | } | |
1030 | ||
1031 | ||
1032 | static int | |
1033 | __chsc_do_secm(struct channel_subsystem *css, int enable, void *page) | |
1034 | { | |
1035 | struct { | |
1036 | struct chsc_header request; | |
1037 | u32 operation_code : 2; | |
1038 | u32 : 30; | |
1039 | u32 key : 4; | |
1040 | u32 : 28; | |
1041 | u32 zeroes1; | |
1042 | u32 cub_addr1; | |
1043 | u32 zeroes2; | |
1044 | u32 cub_addr2; | |
1045 | u32 reserved[13]; | |
1046 | struct chsc_header response; | |
1047 | u32 status : 8; | |
1048 | u32 : 4; | |
1049 | u32 fmt : 4; | |
1050 | u32 : 16; | |
0f008aa3 | 1051 | } __attribute__ ((packed)) *secm_area; |
495a5b45 CH |
1052 | int ret, ccode; |
1053 | ||
1054 | secm_area = page; | |
1055 | secm_area->request.length = 0x0050; | |
1056 | secm_area->request.code = 0x0016; | |
1057 | ||
1058 | secm_area->key = PAGE_DEFAULT_KEY; | |
1059 | secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1; | |
1060 | secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2; | |
1061 | ||
1062 | secm_area->operation_code = enable ? 0 : 1; | |
1063 | ||
1064 | ccode = chsc(secm_area); | |
1065 | if (ccode > 0) | |
1066 | return (ccode == 3) ? -ENODEV : -EBUSY; | |
1067 | ||
1068 | switch (secm_area->response.code) { | |
1069 | case 0x0001: /* Success. */ | |
1070 | ret = 0; | |
1071 | break; | |
1072 | case 0x0003: /* Invalid block. */ | |
1073 | case 0x0007: /* Invalid format. */ | |
1074 | case 0x0008: /* Other invalid block. */ | |
1075 | CIO_CRW_EVENT(2, "Error in chsc request block!\n"); | |
1076 | ret = -EINVAL; | |
1077 | break; | |
1078 | case 0x0004: /* Command not provided in model. */ | |
1079 | CIO_CRW_EVENT(2, "Model does not provide secm\n"); | |
1080 | ret = -EOPNOTSUPP; | |
1081 | break; | |
1082 | case 0x0102: /* cub adresses incorrect */ | |
1083 | CIO_CRW_EVENT(2, "Invalid addresses in chsc request block\n"); | |
1084 | ret = -EINVAL; | |
1085 | break; | |
1086 | case 0x0103: /* key error */ | |
1087 | CIO_CRW_EVENT(2, "Access key error in secm\n"); | |
1088 | ret = -EINVAL; | |
1089 | break; | |
1090 | case 0x0105: /* error while starting */ | |
1091 | CIO_CRW_EVENT(2, "Error while starting channel measurement\n"); | |
1092 | ret = -EIO; | |
1093 | break; | |
1094 | default: | |
1095 | CIO_CRW_EVENT(2, "Unknown CHSC response %d\n", | |
1096 | secm_area->response.code); | |
1097 | ret = -EIO; | |
1098 | } | |
1099 | return ret; | |
1100 | } | |
1101 | ||
1102 | int | |
1103 | chsc_secm(struct channel_subsystem *css, int enable) | |
1104 | { | |
1105 | void *secm_area; | |
1106 | int ret; | |
1107 | ||
1108 | secm_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1109 | if (!secm_area) | |
1110 | return -ENOMEM; | |
1111 | ||
1112 | mutex_lock(&css->mutex); | |
1113 | if (enable && !css->cm_enabled) { | |
1114 | css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1115 | css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1116 | if (!css->cub_addr1 || !css->cub_addr2) { | |
1117 | free_page((unsigned long)css->cub_addr1); | |
1118 | free_page((unsigned long)css->cub_addr2); | |
1119 | free_page((unsigned long)secm_area); | |
1120 | mutex_unlock(&css->mutex); | |
1121 | return -ENOMEM; | |
1122 | } | |
1123 | } | |
1124 | ret = __chsc_do_secm(css, enable, secm_area); | |
1125 | if (!ret) { | |
1126 | css->cm_enabled = enable; | |
1127 | if (css->cm_enabled) { | |
1128 | ret = chsc_add_cmg_attr(css); | |
1129 | if (ret) { | |
1130 | memset(secm_area, 0, PAGE_SIZE); | |
1131 | __chsc_do_secm(css, 0, secm_area); | |
1132 | css->cm_enabled = 0; | |
1133 | } | |
1134 | } else | |
1135 | chsc_remove_cmg_attr(css); | |
1136 | } | |
1137 | if (enable && !css->cm_enabled) { | |
1138 | free_page((unsigned long)css->cub_addr1); | |
1139 | free_page((unsigned long)css->cub_addr2); | |
1140 | } | |
1141 | mutex_unlock(&css->mutex); | |
1142 | free_page((unsigned long)secm_area); | |
1143 | return ret; | |
1144 | } | |
1145 | ||
1da177e4 LT |
1146 | /* |
1147 | * Files for the channel path entries. | |
1148 | */ | |
1149 | static ssize_t | |
3fd3c0a5 | 1150 | chp_status_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
1151 | { |
1152 | struct channel_path *chp = container_of(dev, struct channel_path, dev); | |
1153 | ||
1154 | if (!chp) | |
1155 | return 0; | |
f86635fa | 1156 | return (get_chp_status(chp->chpid) ? sprintf(buf, "online\n") : |
1da177e4 LT |
1157 | sprintf(buf, "offline\n")); |
1158 | } | |
1159 | ||
1160 | static ssize_t | |
3fd3c0a5 | 1161 | chp_status_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
1162 | { |
1163 | struct channel_path *cp = container_of(dev, struct channel_path, dev); | |
1164 | char cmd[10]; | |
1165 | int num_args; | |
1166 | int error; | |
1167 | ||
1168 | num_args = sscanf(buf, "%5s", cmd); | |
1169 | if (!num_args) | |
1170 | return count; | |
1171 | ||
d120b2a4 | 1172 | if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1")) |
f86635fa | 1173 | error = s390_vary_chpid(cp->chpid, 1); |
d120b2a4 | 1174 | else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0")) |
f86635fa | 1175 | error = s390_vary_chpid(cp->chpid, 0); |
1da177e4 LT |
1176 | else |
1177 | error = -EINVAL; | |
1178 | ||
1179 | return error < 0 ? error : count; | |
1180 | ||
1181 | } | |
1182 | ||
1183 | static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); | |
1184 | ||
1185 | static ssize_t | |
3fd3c0a5 | 1186 | chp_type_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
1187 | { |
1188 | struct channel_path *chp = container_of(dev, struct channel_path, dev); | |
1189 | ||
1190 | if (!chp) | |
1191 | return 0; | |
1192 | return sprintf(buf, "%x\n", chp->desc.desc); | |
1193 | } | |
1194 | ||
1195 | static DEVICE_ATTR(type, 0444, chp_type_show, NULL); | |
1196 | ||
495a5b45 CH |
1197 | static ssize_t |
1198 | chp_cmg_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1199 | { | |
1200 | struct channel_path *chp = to_channelpath(dev); | |
1201 | ||
1202 | if (!chp) | |
1203 | return 0; | |
1204 | if (chp->cmg == -1) /* channel measurements not available */ | |
1205 | return sprintf(buf, "unknown\n"); | |
1206 | return sprintf(buf, "%x\n", chp->cmg); | |
1207 | } | |
1208 | ||
1209 | static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); | |
1210 | ||
1211 | static ssize_t | |
1212 | chp_shared_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1213 | { | |
1214 | struct channel_path *chp = to_channelpath(dev); | |
1215 | ||
1216 | if (!chp) | |
1217 | return 0; | |
1218 | if (chp->shared == -1) /* channel measurements not available */ | |
1219 | return sprintf(buf, "unknown\n"); | |
1220 | return sprintf(buf, "%x\n", chp->shared); | |
1221 | } | |
1222 | ||
1223 | static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); | |
1224 | ||
1da177e4 LT |
1225 | static struct attribute * chp_attrs[] = { |
1226 | &dev_attr_status.attr, | |
1227 | &dev_attr_type.attr, | |
495a5b45 CH |
1228 | &dev_attr_cmg.attr, |
1229 | &dev_attr_shared.attr, | |
1da177e4 LT |
1230 | NULL, |
1231 | }; | |
1232 | ||
1233 | static struct attribute_group chp_attr_group = { | |
1234 | .attrs = chp_attrs, | |
1235 | }; | |
1236 | ||
1237 | static void | |
1238 | chp_release(struct device *dev) | |
1239 | { | |
1240 | struct channel_path *cp; | |
1241 | ||
1242 | cp = container_of(dev, struct channel_path, dev); | |
1243 | kfree(cp); | |
1244 | } | |
1245 | ||
f86635fa PO |
1246 | static int chsc_determine_channel_path_description(struct chp_id chpid, |
1247 | struct channel_path_desc *desc) | |
1da177e4 LT |
1248 | { |
1249 | int ccode, ret; | |
1250 | ||
1251 | struct { | |
1252 | struct chsc_header request; | |
1253 | u32 : 24; | |
1254 | u32 first_chpid : 8; | |
1255 | u32 : 24; | |
1256 | u32 last_chpid : 8; | |
1257 | u32 zeroes1; | |
1258 | struct chsc_header response; | |
1259 | u32 zeroes2; | |
1260 | struct channel_path_desc desc; | |
0f008aa3 | 1261 | } __attribute__ ((packed)) *scpd_area; |
1da177e4 LT |
1262 | |
1263 | scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1264 | if (!scpd_area) | |
1265 | return -ENOMEM; | |
1266 | ||
495a5b45 CH |
1267 | scpd_area->request.length = 0x0010; |
1268 | scpd_area->request.code = 0x0002; | |
1da177e4 | 1269 | |
f86635fa PO |
1270 | scpd_area->first_chpid = chpid.id; |
1271 | scpd_area->last_chpid = chpid.id; | |
1da177e4 LT |
1272 | |
1273 | ccode = chsc(scpd_area); | |
1274 | if (ccode > 0) { | |
1275 | ret = (ccode == 3) ? -ENODEV : -EBUSY; | |
1276 | goto out; | |
1277 | } | |
1278 | ||
1279 | switch (scpd_area->response.code) { | |
1280 | case 0x0001: /* Success. */ | |
1281 | memcpy(desc, &scpd_area->desc, | |
1282 | sizeof(struct channel_path_desc)); | |
1283 | ret = 0; | |
1284 | break; | |
1285 | case 0x0003: /* Invalid block. */ | |
1286 | case 0x0007: /* Invalid format. */ | |
1287 | case 0x0008: /* Other invalid block. */ | |
1288 | CIO_CRW_EVENT(2, "Error in chsc request block!\n"); | |
1289 | ret = -EINVAL; | |
1290 | break; | |
1291 | case 0x0004: /* Command not provided in model. */ | |
1292 | CIO_CRW_EVENT(2, "Model does not provide scpd\n"); | |
1293 | ret = -EOPNOTSUPP; | |
1294 | break; | |
1295 | default: | |
1296 | CIO_CRW_EVENT(2, "Unknown CHSC response %d\n", | |
1297 | scpd_area->response.code); | |
1298 | ret = -EIO; | |
1299 | } | |
1300 | out: | |
1301 | free_page((unsigned long)scpd_area); | |
1302 | return ret; | |
1303 | } | |
1304 | ||
495a5b45 CH |
1305 | static void |
1306 | chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv, | |
1307 | struct cmg_chars *chars) | |
1308 | { | |
1309 | switch (chp->cmg) { | |
1310 | case 2: | |
1311 | case 3: | |
1312 | chp->cmg_chars = kmalloc(sizeof(struct cmg_chars), | |
1313 | GFP_KERNEL); | |
1314 | if (chp->cmg_chars) { | |
1315 | int i, mask; | |
1316 | struct cmg_chars *cmg_chars; | |
1317 | ||
1318 | cmg_chars = chp->cmg_chars; | |
1319 | for (i = 0; i < NR_MEASUREMENT_CHARS; i++) { | |
1320 | mask = 0x80 >> (i + 3); | |
1321 | if (cmcv & mask) | |
1322 | cmg_chars->values[i] = chars->values[i]; | |
1323 | else | |
1324 | cmg_chars->values[i] = 0; | |
1325 | } | |
1326 | } | |
1327 | break; | |
1328 | default: | |
1329 | /* No cmg-dependent data. */ | |
1330 | break; | |
1331 | } | |
1332 | } | |
1333 | ||
1334 | static int | |
1335 | chsc_get_channel_measurement_chars(struct channel_path *chp) | |
1336 | { | |
1337 | int ccode, ret; | |
1338 | ||
1339 | struct { | |
1340 | struct chsc_header request; | |
1341 | u32 : 24; | |
1342 | u32 first_chpid : 8; | |
1343 | u32 : 24; | |
1344 | u32 last_chpid : 8; | |
1345 | u32 zeroes1; | |
1346 | struct chsc_header response; | |
1347 | u32 zeroes2; | |
1348 | u32 not_valid : 1; | |
1349 | u32 shared : 1; | |
1350 | u32 : 22; | |
1351 | u32 chpid : 8; | |
1352 | u32 cmcv : 5; | |
1353 | u32 : 11; | |
1354 | u32 cmgq : 8; | |
1355 | u32 cmg : 8; | |
1356 | u32 zeroes3; | |
1357 | u32 data[NR_MEASUREMENT_CHARS]; | |
0f008aa3 | 1358 | } __attribute__ ((packed)) *scmc_area; |
495a5b45 CH |
1359 | |
1360 | scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1361 | if (!scmc_area) | |
1362 | return -ENOMEM; | |
1363 | ||
1364 | scmc_area->request.length = 0x0010; | |
1365 | scmc_area->request.code = 0x0022; | |
1366 | ||
f86635fa PO |
1367 | scmc_area->first_chpid = chp->chpid.id; |
1368 | scmc_area->last_chpid = chp->chpid.id; | |
495a5b45 CH |
1369 | |
1370 | ccode = chsc(scmc_area); | |
1371 | if (ccode > 0) { | |
1372 | ret = (ccode == 3) ? -ENODEV : -EBUSY; | |
1373 | goto out; | |
1374 | } | |
1375 | ||
1376 | switch (scmc_area->response.code) { | |
1377 | case 0x0001: /* Success. */ | |
1378 | if (!scmc_area->not_valid) { | |
1379 | chp->cmg = scmc_area->cmg; | |
1380 | chp->shared = scmc_area->shared; | |
1381 | chsc_initialize_cmg_chars(chp, scmc_area->cmcv, | |
1382 | (struct cmg_chars *) | |
1383 | &scmc_area->data); | |
1384 | } else { | |
1385 | chp->cmg = -1; | |
1386 | chp->shared = -1; | |
1387 | } | |
1388 | ret = 0; | |
1389 | break; | |
1390 | case 0x0003: /* Invalid block. */ | |
1391 | case 0x0007: /* Invalid format. */ | |
1392 | case 0x0008: /* Invalid bit combination. */ | |
1393 | CIO_CRW_EVENT(2, "Error in chsc request block!\n"); | |
1394 | ret = -EINVAL; | |
1395 | break; | |
1396 | case 0x0004: /* Command not provided. */ | |
1397 | CIO_CRW_EVENT(2, "Model does not provide scmc\n"); | |
1398 | ret = -EOPNOTSUPP; | |
1399 | break; | |
1400 | default: | |
1401 | CIO_CRW_EVENT(2, "Unknown CHSC response %d\n", | |
1402 | scmc_area->response.code); | |
1403 | ret = -EIO; | |
1404 | } | |
1405 | out: | |
1406 | free_page((unsigned long)scmc_area); | |
1407 | return ret; | |
1408 | } | |
1409 | ||
1da177e4 LT |
1410 | /* |
1411 | * Entries for chpids on the system bus. | |
1412 | * This replaces /proc/chpids. | |
1413 | */ | |
f86635fa | 1414 | static int new_channel_path(struct chp_id chpid) |
1da177e4 LT |
1415 | { |
1416 | struct channel_path *chp; | |
1417 | int ret; | |
1418 | ||
88abaab4 | 1419 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
1da177e4 LT |
1420 | if (!chp) |
1421 | return -ENOMEM; | |
1da177e4 LT |
1422 | |
1423 | /* fill in status, etc. */ | |
f86635fa | 1424 | chp->chpid = chpid; |
1da177e4 | 1425 | chp->state = 1; |
f86635fa | 1426 | chp->dev.parent = &css[chpid.cssid]->device; |
292888c8 | 1427 | chp->dev.release = chp_release; |
f86635fa PO |
1428 | snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp%x.%02x", chpid.cssid, |
1429 | chpid.id); | |
1da177e4 LT |
1430 | |
1431 | /* Obtain channel path description and fill it in. */ | |
1432 | ret = chsc_determine_channel_path_description(chpid, &chp->desc); | |
1433 | if (ret) | |
1434 | goto out_free; | |
495a5b45 CH |
1435 | /* Get channel-measurement characteristics. */ |
1436 | if (css_characteristics_avail && css_chsc_characteristics.scmc | |
1437 | && css_chsc_characteristics.secm) { | |
1438 | ret = chsc_get_channel_measurement_chars(chp); | |
1439 | if (ret) | |
1440 | goto out_free; | |
1441 | } else { | |
1442 | static int msg_done; | |
1443 | ||
1444 | if (!msg_done) { | |
1445 | printk(KERN_WARNING "cio: Channel measurements not " | |
1446 | "available, continuing.\n"); | |
1447 | msg_done = 1; | |
1448 | } | |
1449 | chp->cmg = -1; | |
1450 | } | |
1da177e4 LT |
1451 | |
1452 | /* make it known to the system */ | |
1453 | ret = device_register(&chp->dev); | |
1454 | if (ret) { | |
f86635fa PO |
1455 | printk(KERN_WARNING "%s: could not register %x.%02x\n", |
1456 | __func__, chpid.cssid, chpid.id); | |
1da177e4 LT |
1457 | goto out_free; |
1458 | } | |
1459 | ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group); | |
1460 | if (ret) { | |
1461 | device_unregister(&chp->dev); | |
1462 | goto out_free; | |
495a5b45 | 1463 | } |
f86635fa PO |
1464 | mutex_lock(&css[chpid.cssid]->mutex); |
1465 | if (css[chpid.cssid]->cm_enabled) { | |
495a5b45 CH |
1466 | ret = chsc_add_chp_cmg_attr(chp); |
1467 | if (ret) { | |
1468 | sysfs_remove_group(&chp->dev.kobj, &chp_attr_group); | |
1469 | device_unregister(&chp->dev); | |
f86635fa | 1470 | mutex_unlock(&css[chpid.cssid]->mutex); |
495a5b45 CH |
1471 | goto out_free; |
1472 | } | |
1473 | } | |
f86635fa PO |
1474 | css[chpid.cssid]->chps[chpid.id] = chp; |
1475 | mutex_unlock(&css[chpid.cssid]->mutex); | |
1da177e4 LT |
1476 | return ret; |
1477 | out_free: | |
1478 | kfree(chp); | |
1479 | return ret; | |
1480 | } | |
1481 | ||
1482 | void * | |
1483 | chsc_get_chp_desc(struct subchannel *sch, int chp_no) | |
1484 | { | |
1485 | struct channel_path *chp; | |
1486 | struct channel_path_desc *desc; | |
f86635fa | 1487 | struct chp_id chpid; |
1da177e4 | 1488 | |
f86635fa PO |
1489 | chp_id_init(&chpid); |
1490 | chpid.id = sch->schib.pmcw.chpid[chp_no]; | |
1491 | chp = chpid_to_chp(chpid); | |
1da177e4 LT |
1492 | if (!chp) |
1493 | return NULL; | |
1494 | desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL); | |
1495 | if (!desc) | |
1496 | return NULL; | |
1497 | memcpy(desc, &chp->desc, sizeof(struct channel_path_desc)); | |
1498 | return desc; | |
1499 | } | |
1500 | ||
1da177e4 LT |
1501 | static int __init |
1502 | chsc_alloc_sei_area(void) | |
1503 | { | |
1504 | sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1505 | if (!sei_page) | |
1506 | printk(KERN_WARNING"Can't allocate page for processing of " \ | |
1507 | "chsc machine checks!\n"); | |
1508 | return (sei_page ? 0 : -ENOMEM); | |
1509 | } | |
1510 | ||
fb6958a5 CH |
1511 | int __init |
1512 | chsc_enable_facility(int operation_code) | |
1513 | { | |
1514 | int ret; | |
1515 | struct { | |
1516 | struct chsc_header request; | |
1517 | u8 reserved1:4; | |
1518 | u8 format:4; | |
1519 | u8 reserved2; | |
1520 | u16 operation_code; | |
1521 | u32 reserved3; | |
1522 | u32 reserved4; | |
1523 | u32 operation_data_area[252]; | |
1524 | struct chsc_header response; | |
1525 | u32 reserved5:4; | |
1526 | u32 format2:4; | |
1527 | u32 reserved6:24; | |
0f008aa3 | 1528 | } __attribute__ ((packed)) *sda_area; |
fb6958a5 CH |
1529 | |
1530 | sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA); | |
1531 | if (!sda_area) | |
1532 | return -ENOMEM; | |
495a5b45 CH |
1533 | sda_area->request.length = 0x0400; |
1534 | sda_area->request.code = 0x0031; | |
fb6958a5 CH |
1535 | sda_area->operation_code = operation_code; |
1536 | ||
1537 | ret = chsc(sda_area); | |
1538 | if (ret > 0) { | |
1539 | ret = (ret == 3) ? -ENODEV : -EBUSY; | |
1540 | goto out; | |
1541 | } | |
1542 | switch (sda_area->response.code) { | |
15730ddb CH |
1543 | case 0x0001: /* everything ok */ |
1544 | ret = 0; | |
1545 | break; | |
fb6958a5 CH |
1546 | case 0x0003: /* invalid request block */ |
1547 | case 0x0007: | |
1548 | ret = -EINVAL; | |
1549 | break; | |
1550 | case 0x0004: /* command not provided */ | |
1551 | case 0x0101: /* facility not provided */ | |
1552 | ret = -EOPNOTSUPP; | |
1553 | break; | |
15730ddb CH |
1554 | default: /* something went wrong */ |
1555 | ret = -EIO; | |
fb6958a5 CH |
1556 | } |
1557 | out: | |
1558 | free_page((unsigned long)sda_area); | |
1559 | return ret; | |
1560 | } | |
1561 | ||
1da177e4 LT |
1562 | subsys_initcall(chsc_alloc_sei_area); |
1563 | ||
1564 | struct css_general_char css_general_characteristics; | |
1565 | struct css_chsc_char css_chsc_characteristics; | |
1566 | ||
1567 | int __init | |
1568 | chsc_determine_css_characteristics(void) | |
1569 | { | |
1570 | int result; | |
1571 | struct { | |
1572 | struct chsc_header request; | |
1573 | u32 reserved1; | |
1574 | u32 reserved2; | |
1575 | u32 reserved3; | |
1576 | struct chsc_header response; | |
1577 | u32 reserved4; | |
1578 | u32 general_char[510]; | |
1579 | u32 chsc_char[518]; | |
0f008aa3 | 1580 | } __attribute__ ((packed)) *scsc_area; |
1da177e4 LT |
1581 | |
1582 | scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1583 | if (!scsc_area) { | |
1584 | printk(KERN_WARNING"cio: Was not able to determine available" \ | |
1585 | "CHSCs due to no memory.\n"); | |
1586 | return -ENOMEM; | |
1587 | } | |
1588 | ||
495a5b45 CH |
1589 | scsc_area->request.length = 0x0010; |
1590 | scsc_area->request.code = 0x0010; | |
1da177e4 LT |
1591 | |
1592 | result = chsc(scsc_area); | |
1593 | if (result) { | |
1594 | printk(KERN_WARNING"cio: Was not able to determine " \ | |
1595 | "available CHSCs, cc=%i.\n", result); | |
1596 | result = -EIO; | |
1597 | goto exit; | |
1598 | } | |
1599 | ||
1600 | if (scsc_area->response.code != 1) { | |
1601 | printk(KERN_WARNING"cio: Was not able to determine " \ | |
1602 | "available CHSCs.\n"); | |
1603 | result = -EIO; | |
1604 | goto exit; | |
1605 | } | |
1606 | memcpy(&css_general_characteristics, scsc_area->general_char, | |
1607 | sizeof(css_general_characteristics)); | |
1608 | memcpy(&css_chsc_characteristics, scsc_area->chsc_char, | |
1609 | sizeof(css_chsc_characteristics)); | |
1610 | exit: | |
1611 | free_page ((unsigned long) scsc_area); | |
1612 | return result; | |
1613 | } | |
1614 | ||
1615 | EXPORT_SYMBOL_GPL(css_general_characteristics); | |
1616 | EXPORT_SYMBOL_GPL(css_chsc_characteristics); |