2 * drivers/s390/cio/chsc.c
3 * S/390 common I/O routines -- channel subsystem call
5 * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
7 * Author(s): Ingo Adlung (adlung@de.ibm.com)
8 * Cornelia Huck (cornelia.huck@de.ibm.com)
9 * Arnd Bergmann (arndb@de.ibm.com)
12 #include <linux/module.h>
13 #include <linux/config.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/device.h>
22 #include "cio_debug.h"
26 static void *sei_page;
28 static int new_channel_path(int chpid);
31 set_chp_logically_online(int chp, int onoff)
33 css[0]->chps[chp]->state = onoff;
37 get_chp_status(int chp)
39 return (css[0]->chps[chp] ? css[0]->chps[chp]->state : -ENODEV);
43 chsc_validate_chpids(struct subchannel *sch)
47 for (chp = 0; chp <= 7; chp++) {
49 if (!get_chp_status(sch->schib.pmcw.chpid[chp]))
50 /* disable using this path */
56 chpid_is_actually_online(int chp)
60 state = get_chp_status(chp);
63 queue_work(slow_path_wq, &slow_path_work);
68 /* FIXME: this is _always_ called for every subchannel. shouldn't we
69 * process more than one at a time? */
71 chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
76 struct chsc_header request;
80 u16 f_sch; /* first subchannel */
82 u16 l_sch; /* last subchannel */
84 struct chsc_header response;
88 u8 st : 3; /* subchannel type */
90 u8 unit_addr; /* unit address */
91 u16 devno; /* device number */
94 u16 sch; /* subchannel */
95 u8 chpid[8]; /* chpids 0-7 */
96 u16 fla[8]; /* full link addresses 0-7 */
101 ssd_area->request.length = 0x0010;
102 ssd_area->request.code = 0x0004;
104 ssd_area->ssid = sch->schid.ssid;
105 ssd_area->f_sch = sch->schid.sch_no;
106 ssd_area->l_sch = sch->schid.sch_no;
108 ccode = chsc(ssd_area);
110 pr_debug("chsc returned with ccode = %d\n", ccode);
111 return (ccode == 3) ? -ENODEV : -EBUSY;
114 switch (ssd_area->response.code) {
115 case 0x0001: /* everything ok */
118 CIO_CRW_EVENT(2, "Invalid command!\n");
121 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
124 CIO_CRW_EVENT(2, "Model does not provide ssd\n");
127 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
128 ssd_area->response.code);
133 * ssd_area->st stores the type of the detected
134 * subchannel, with the following definitions:
136 * 0: I/O subchannel: All fields have meaning
137 * 1: CHSC subchannel: Only sch_val, st and sch
139 * 2: Message subchannel: All fields except unit_addr
141 * 3: ADM subchannel: Only sch_val, st and sch
144 * Other types are currently undefined.
146 if (ssd_area->st > 3) { /* uhm, that looks strange... */
147 CIO_CRW_EVENT(0, "Strange subchannel type %d"
148 " for sch 0.%x.%04x\n", ssd_area->st,
149 sch->schid.ssid, sch->schid.sch_no);
151 * There may have been a new subchannel type defined in the
152 * time since this code was written; since we don't know which
153 * fields have meaning and what to do with it we just jump out
157 const char *type[4] = {"I/O", "chsc", "message", "ADM"};
158 CIO_CRW_EVENT(6, "ssd: sch 0.%x.%04x is %s subchannel\n",
159 sch->schid.ssid, sch->schid.sch_no,
162 sch->ssd_info.valid = 1;
163 sch->ssd_info.type = ssd_area->st;
166 if (ssd_area->st == 0 || ssd_area->st == 2) {
167 for (j = 0; j < 8; j++) {
168 if (!((0x80 >> j) & ssd_area->path_mask &
169 ssd_area->fla_valid_mask))
171 sch->ssd_info.chpid[j] = ssd_area->chpid[j];
172 sch->ssd_info.fla[j] = ssd_area->fla[j];
179 css_get_ssd_info(struct subchannel *sch)
184 page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
187 spin_lock_irq(&sch->lock);
188 ret = chsc_get_sch_desc_irq(sch, page);
190 static int cio_chsc_err_msg;
192 if (!cio_chsc_err_msg) {
194 "chsc_get_sch_descriptions:"
195 " Error %d while doing chsc; "
196 "processing some machine checks may "
198 cio_chsc_err_msg = 1;
201 spin_unlock_irq(&sch->lock);
202 free_page((unsigned long)page);
205 /* Allocate channel path structures, if needed. */
206 for (j = 0; j < 8; j++) {
207 chpid = sch->ssd_info.chpid[j];
208 if (chpid && (get_chp_status(chpid) < 0))
209 new_channel_path(chpid);
216 s390_subchannel_remove_chpid(struct device *dev, void *data)
220 struct subchannel *sch;
221 struct channel_path *chpid;
224 sch = to_subchannel(dev);
226 for (j = 0; j < 8; j++)
227 if (sch->schib.pmcw.chpid[j] == chpid->id)
233 spin_lock_irq(&sch->lock);
235 stsch(sch->schid, &schib);
238 memcpy(&sch->schib, &schib, sizeof(struct schib));
239 /* Check for single path devices. */
240 if (sch->schib.pmcw.pim == 0x80)
242 if (sch->vpm == mask)
245 if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) &&
246 (sch->schib.scsw.actl & SCSW_ACTL_SCHACT) &&
247 (sch->schib.pmcw.lpum == mask)) {
254 if (sch->driver && sch->driver->termination)
255 sch->driver->termination(&sch->dev);
259 /* trigger path verification. */
260 if (sch->driver && sch->driver->verify)
261 sch->driver->verify(&sch->dev);
263 spin_unlock_irq(&sch->lock);
266 spin_unlock_irq(&sch->lock);
268 if (css_enqueue_subchannel_slow(sch->schid)) {
269 css_clear_subchannel_slow_list();
276 s390_set_chpid_offline( __u8 chpid)
281 sprintf(dbf_txt, "chpr%x", chpid);
282 CIO_TRACE_EVENT(2, dbf_txt);
284 if (get_chp_status(chpid) <= 0)
286 dev = get_device(&css[0]->chps[chpid]->dev);
287 bus_for_each_dev(&css_bus_type, NULL, to_channelpath(dev),
288 s390_subchannel_remove_chpid);
290 if (need_rescan || css_slow_subchannels_exist())
291 queue_work(slow_path_wq, &slow_path_work);
295 struct res_acc_data {
296 struct channel_path *chp;
302 s390_process_res_acc_sch(struct res_acc_data *res_data, struct subchannel *sch)
309 for (chp = 0; chp <= 7; chp++)
311 * check if chpid is in information updated by ssd
313 if (sch->ssd_info.valid &&
314 sch->ssd_info.chpid[chp] == res_data->chp->id &&
315 (sch->ssd_info.fla[chp] & res_data->fla_mask)
325 * Do a stsch to update our subchannel structure with the
326 * new path information and eventually check for logically
329 ccode = stsch(sch->schid, &sch->schib);
337 s390_process_res_acc_new_sch(struct subchannel_id schid)
342 * We don't know the device yet, but since a path
343 * may be available now to the device we'll have
344 * to do recognition again.
345 * Since we don't have any idea about which chpid
346 * that beast may be on we'll have to do a stsch
347 * on all devices, grr...
349 if (stsch_err(schid, &schib))
351 return need_rescan ? -EAGAIN : -ENXIO;
353 /* Put it on the slow path. */
354 ret = css_enqueue_subchannel_slow(schid);
356 css_clear_subchannel_slow_list();
364 __s390_process_res_acc(struct subchannel_id schid, void *data)
366 int chp_mask, old_lpm;
367 struct res_acc_data *res_data;
368 struct subchannel *sch;
370 res_data = (struct res_acc_data *)data;
371 sch = get_subchannel_by_schid(schid);
373 /* Check if a subchannel is newly available. */
374 return s390_process_res_acc_new_sch(schid);
376 spin_lock_irq(&sch->lock);
378 chp_mask = s390_process_res_acc_sch(res_data, sch);
381 spin_unlock_irq(&sch->lock);
385 sch->lpm = ((sch->schib.pmcw.pim &
386 sch->schib.pmcw.pam &
388 | chp_mask) & sch->opm;
389 if (!old_lpm && sch->lpm)
390 device_trigger_reprobe(sch);
391 else if (sch->driver && sch->driver->verify)
392 sch->driver->verify(&sch->dev);
394 spin_unlock_irq(&sch->lock);
395 put_device(&sch->dev);
396 return (res_data->fla_mask == 0xffff) ? -ENODEV : 0;
401 s390_process_res_acc (struct res_acc_data *res_data)
406 sprintf(dbf_txt, "accpr%x", res_data->chp->id);
407 CIO_TRACE_EVENT( 2, dbf_txt);
408 if (res_data->fla != 0) {
409 sprintf(dbf_txt, "fla%x", res_data->fla);
410 CIO_TRACE_EVENT( 2, dbf_txt);
414 * I/O resources may have become accessible.
415 * Scan through all subchannels that may be concerned and
416 * do a validation on those.
417 * The more information we have (info), the less scanning
418 * will we have to do.
420 rc = for_each_subchannel(__s390_process_res_acc, res_data);
421 if (css_slow_subchannels_exist())
423 else if (rc != -EAGAIN)
429 __get_chpid_from_lir(void *data)
435 /* incident-node descriptor */
437 /* attached-node descriptor */
439 /* incident-specific information */
443 lir = (struct lir*) data;
445 /* NULL link incident record */
447 if (!(lir->indesc[0]&0xc0000000))
448 /* node descriptor not valid */
450 if (!(lir->indesc[0]&0x10000000))
451 /* don't handle device-type nodes - FIXME */
453 /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
455 return (u16) (lir->indesc[0]&0x000000ff);
459 chsc_process_crw(void)
462 struct res_acc_data res_data;
464 struct chsc_header request;
468 struct chsc_header response;
471 u8 vf; /* validity flags */
472 u8 rs; /* reporting source */
473 u8 cc; /* content code */
474 u16 fla; /* full link address */
475 u16 rsid; /* reporting source id */
478 u32 ccdf[96]; /* content-code dependent field */
479 /* ccdf has to be big enough for a link-incident record */
485 * build the chsc request block for store event information
487 * This function is only called by the machine check handler thread,
488 * so we don't need locking for the sei_page.
492 CIO_TRACE_EVENT( 2, "prcss");
497 memset(sei_area, 0, sizeof(*sei_area));
498 memset(&res_data, 0, sizeof(struct res_acc_data));
499 sei_area->request.length = 0x0010;
500 sei_area->request.code = 0x000e;
502 ccode = chsc(sei_area);
506 switch (sei_area->response.code) {
507 /* for debug purposes, check for problems */
509 CIO_CRW_EVENT(4, "chsc_process_crw: event information "
510 "successfully stored\n");
511 break; /* everything ok */
514 "chsc_process_crw: invalid command!\n");
517 CIO_CRW_EVENT(2, "chsc_process_crw: error in chsc "
521 CIO_CRW_EVENT(2, "chsc_process_crw: no event "
522 "information stored\n");
525 CIO_CRW_EVENT(2, "chsc_process_crw: chsc response %d\n",
526 sei_area->response.code);
530 /* Check if we might have lost some information. */
531 if (sei_area->flags & 0x40)
532 CIO_CRW_EVENT(2, "chsc_process_crw: Event information "
533 "has been lost due to overflow!\n");
535 if (sei_area->rs != 4) {
536 CIO_CRW_EVENT(2, "chsc_process_crw: reporting source "
537 "(%04X) isn't a chpid!\n",
542 /* which kind of information was stored? */
543 switch (sei_area->cc) {
544 case 1: /* link incident*/
545 CIO_CRW_EVENT(4, "chsc_process_crw: "
546 "channel subsystem reports link incident,"
547 " reporting source is chpid %x\n",
549 chpid = __get_chpid_from_lir(sei_area->ccdf);
551 CIO_CRW_EVENT(4, "%s: Invalid LIR, skipping\n",
554 s390_set_chpid_offline(chpid);
557 case 2: /* i/o resource accessibiliy */
558 CIO_CRW_EVENT(4, "chsc_process_crw: "
559 "channel subsystem reports some I/O "
560 "devices may have become accessible\n");
561 pr_debug("Data received after sei: \n");
562 pr_debug("Validity flags: %x\n", sei_area->vf);
564 /* allocate a new channel path structure, if needed */
565 status = get_chp_status(sei_area->rsid);
567 new_channel_path(sei_area->rsid);
570 dev = get_device(&css[0]->chps[sei_area->rsid]->dev);
571 res_data.chp = to_channelpath(dev);
572 pr_debug("chpid: %x", sei_area->rsid);
573 if ((sei_area->vf & 0xc0) != 0) {
574 res_data.fla = sei_area->fla;
575 if ((sei_area->vf & 0xc0) == 0xc0) {
576 pr_debug(" full link addr: %x",
578 res_data.fla_mask = 0xffff;
580 pr_debug(" link addr: %x",
582 res_data.fla_mask = 0xff00;
585 ret = s390_process_res_acc(&res_data);
590 default: /* other stuff */
591 CIO_CRW_EVENT(4, "chsc_process_crw: event %d\n",
595 } while (sei_area->flags & 0x80);
600 __chp_add_new_sch(struct subchannel_id schid)
605 if (stsch(schid, &schib))
607 return need_rescan ? -EAGAIN : -ENXIO;
609 /* Put it on the slow path. */
610 ret = css_enqueue_subchannel_slow(schid);
612 css_clear_subchannel_slow_list();
621 __chp_add(struct subchannel_id schid, void *data)
624 struct channel_path *chp;
625 struct subchannel *sch;
627 chp = (struct channel_path *)data;
628 sch = get_subchannel_by_schid(schid);
630 /* Check if the subchannel is now available. */
631 return __chp_add_new_sch(schid);
632 spin_lock_irq(&sch->lock);
634 if (sch->schib.pmcw.chpid[i] == chp->id) {
635 if (stsch(sch->schid, &sch->schib) != 0) {
637 spin_unlock_irq(&sch->lock);
643 spin_unlock_irq(&sch->lock);
646 sch->lpm = ((sch->schib.pmcw.pim &
647 sch->schib.pmcw.pam &
649 | 0x80 >> i) & sch->opm;
651 if (sch->driver && sch->driver->verify)
652 sch->driver->verify(&sch->dev);
654 spin_unlock_irq(&sch->lock);
655 put_device(&sch->dev);
666 if (!get_chp_status(chpid))
667 return 0; /* no need to do the rest */
669 sprintf(dbf_txt, "cadd%x", chpid);
670 CIO_TRACE_EVENT(2, dbf_txt);
672 dev = get_device(&css[0]->chps[chpid]->dev);
673 rc = for_each_subchannel(__chp_add, to_channelpath(dev));
674 if (css_slow_subchannels_exist())
683 * Handling of crw machine checks with channel path source.
686 chp_process_crw(int chpid, int on)
689 /* Path has gone. We use the link incident routine.*/
690 s390_set_chpid_offline(chpid);
691 return 0; /* De-register is async anyway. */
694 * Path has come. Allocate a new channel path structure,
697 if (get_chp_status(chpid) < 0)
698 new_channel_path(chpid);
699 /* Avoid the extra overhead in process_rec_acc. */
700 return chp_add(chpid);
704 __check_for_io_and_kill(struct subchannel *sch, int index)
708 if (!device_is_online(sch))
709 /* cio could be doing I/O. */
711 cc = stsch(sch->schid, &sch->schib);
714 if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == (0x80 >> index)) {
715 device_set_waiting(sch);
722 __s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on)
727 if (!sch->ssd_info.valid)
730 spin_lock_irqsave(&sch->lock, flags);
732 for (chp = 0; chp < 8; chp++) {
733 if (sch->ssd_info.chpid[chp] != chpid)
737 sch->opm |= (0x80 >> chp);
738 sch->lpm |= (0x80 >> chp);
740 device_trigger_reprobe(sch);
741 else if (sch->driver && sch->driver->verify)
742 sch->driver->verify(&sch->dev);
744 sch->opm &= ~(0x80 >> chp);
745 sch->lpm &= ~(0x80 >> chp);
747 * Give running I/O a grace period in which it
748 * can successfully terminate, even using the
749 * just varied off path. Then kill it.
751 if (!__check_for_io_and_kill(sch, chp) && !sch->lpm) {
752 if (css_enqueue_subchannel_slow(sch->schid)) {
753 css_clear_subchannel_slow_list();
756 } else if (sch->driver && sch->driver->verify)
757 sch->driver->verify(&sch->dev);
761 spin_unlock_irqrestore(&sch->lock, flags);
765 s390_subchannel_vary_chpid_off(struct device *dev, void *data)
767 struct subchannel *sch;
770 sch = to_subchannel(dev);
773 __s390_subchannel_vary_chpid(sch, *chpid, 0);
778 s390_subchannel_vary_chpid_on(struct device *dev, void *data)
780 struct subchannel *sch;
783 sch = to_subchannel(dev);
786 __s390_subchannel_vary_chpid(sch, *chpid, 1);
791 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
794 struct subchannel *sch;
796 sch = get_subchannel_by_schid(schid);
798 put_device(&sch->dev);
801 if (stsch_err(schid, &schib))
804 /* Put it on the slow path. */
805 if (css_enqueue_subchannel_slow(schid)) {
806 css_clear_subchannel_slow_list();
814 * Function: s390_vary_chpid
815 * Varies the specified chpid online or offline
818 s390_vary_chpid( __u8 chpid, int on)
823 sprintf(dbf_text, on?"varyon%x":"varyoff%x", chpid);
824 CIO_TRACE_EVENT( 2, dbf_text);
826 status = get_chp_status(chpid);
828 printk(KERN_ERR "Can't vary unknown chpid %02X\n", chpid);
832 if (!on && !status) {
833 printk(KERN_ERR "chpid %x is already offline\n", chpid);
837 set_chp_logically_online(chpid, on);
840 * Redo PathVerification on the devices the chpid connects to
843 bus_for_each_dev(&css_bus_type, NULL, &chpid, on ?
844 s390_subchannel_vary_chpid_on :
845 s390_subchannel_vary_chpid_off);
847 /* Scan for new devices on varied on path. */
848 for_each_subchannel(__s390_vary_chpid_on, NULL);
849 if (need_rescan || css_slow_subchannels_exist())
850 queue_work(slow_path_wq, &slow_path_work);
855 * Channel measurement related functions
858 chp_measurement_chars_read(struct kobject *kobj, char *buf, loff_t off,
861 struct channel_path *chp;
864 chp = to_channelpath(container_of(kobj, struct device, kobj));
868 size = sizeof(struct cmg_chars);
872 if (off + count > size)
874 memcpy(buf, chp->cmg_chars + off, count);
878 static struct bin_attribute chp_measurement_chars_attr = {
880 .name = "measurement_chars",
882 .owner = THIS_MODULE,
884 .size = sizeof(struct cmg_chars),
885 .read = chp_measurement_chars_read,
889 chp_measurement_copy_block(struct cmg_entry *buf,
890 struct channel_subsystem *css, int chpid)
893 struct cmg_entry *entry, reference_buf;
897 area = css->cub_addr1;
900 area = css->cub_addr2;
903 entry = area + (idx * sizeof(struct cmg_entry));
905 memcpy(buf, entry, sizeof(*entry));
906 memcpy(&reference_buf, entry, sizeof(*entry));
907 } while (reference_buf.values[0] != buf->values[0]);
911 chp_measurement_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
913 struct channel_path *chp;
914 struct channel_subsystem *css;
917 chp = to_channelpath(container_of(kobj, struct device, kobj));
918 css = to_css(chp->dev.parent);
920 size = sizeof(struct cmg_entry);
922 /* Only allow single reads. */
923 if (off || count < size)
925 chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->id);
930 static struct bin_attribute chp_measurement_attr = {
932 .name = "measurement",
934 .owner = THIS_MODULE,
936 .size = sizeof(struct cmg_entry),
937 .read = chp_measurement_read,
941 chsc_remove_chp_cmg_attr(struct channel_path *chp)
943 sysfs_remove_bin_file(&chp->dev.kobj, &chp_measurement_chars_attr);
944 sysfs_remove_bin_file(&chp->dev.kobj, &chp_measurement_attr);
948 chsc_add_chp_cmg_attr(struct channel_path *chp)
952 ret = sysfs_create_bin_file(&chp->dev.kobj,
953 &chp_measurement_chars_attr);
956 ret = sysfs_create_bin_file(&chp->dev.kobj, &chp_measurement_attr);
958 sysfs_remove_bin_file(&chp->dev.kobj,
959 &chp_measurement_chars_attr);
964 chsc_remove_cmg_attr(struct channel_subsystem *css)
968 for (i = 0; i <= __MAX_CHPID; i++) {
971 chsc_remove_chp_cmg_attr(css->chps[i]);
976 chsc_add_cmg_attr(struct channel_subsystem *css)
981 for (i = 0; i <= __MAX_CHPID; i++) {
984 ret = chsc_add_chp_cmg_attr(css->chps[i]);
990 for (--i; i >= 0; i--) {
993 chsc_remove_chp_cmg_attr(css->chps[i]);
1000 __chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
1003 struct chsc_header request;
1004 u32 operation_code : 2;
1013 struct chsc_header response;
1022 secm_area->request.length = 0x0050;
1023 secm_area->request.code = 0x0016;
1025 secm_area->key = PAGE_DEFAULT_KEY;
1026 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
1027 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
1029 secm_area->operation_code = enable ? 0 : 1;
1031 ccode = chsc(secm_area);
1033 return (ccode == 3) ? -ENODEV : -EBUSY;
1035 switch (secm_area->response.code) {
1036 case 0x0001: /* Success. */
1039 case 0x0003: /* Invalid block. */
1040 case 0x0007: /* Invalid format. */
1041 case 0x0008: /* Other invalid block. */
1042 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
1045 case 0x0004: /* Command not provided in model. */
1046 CIO_CRW_EVENT(2, "Model does not provide secm\n");
1049 case 0x0102: /* cub adresses incorrect */
1050 CIO_CRW_EVENT(2, "Invalid addresses in chsc request block\n");
1053 case 0x0103: /* key error */
1054 CIO_CRW_EVENT(2, "Access key error in secm\n");
1057 case 0x0105: /* error while starting */
1058 CIO_CRW_EVENT(2, "Error while starting channel measurement\n");
1062 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
1063 secm_area->response.code);
1070 chsc_secm(struct channel_subsystem *css, int enable)
1075 secm_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1079 mutex_lock(&css->mutex);
1080 if (enable && !css->cm_enabled) {
1081 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1082 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1083 if (!css->cub_addr1 || !css->cub_addr2) {
1084 free_page((unsigned long)css->cub_addr1);
1085 free_page((unsigned long)css->cub_addr2);
1086 free_page((unsigned long)secm_area);
1087 mutex_unlock(&css->mutex);
1091 ret = __chsc_do_secm(css, enable, secm_area);
1093 css->cm_enabled = enable;
1094 if (css->cm_enabled) {
1095 ret = chsc_add_cmg_attr(css);
1097 memset(secm_area, 0, PAGE_SIZE);
1098 __chsc_do_secm(css, 0, secm_area);
1099 css->cm_enabled = 0;
1102 chsc_remove_cmg_attr(css);
1104 if (enable && !css->cm_enabled) {
1105 free_page((unsigned long)css->cub_addr1);
1106 free_page((unsigned long)css->cub_addr2);
1108 mutex_unlock(&css->mutex);
1109 free_page((unsigned long)secm_area);
1114 * Files for the channel path entries.
1117 chp_status_show(struct device *dev, struct device_attribute *attr, char *buf)
1119 struct channel_path *chp = container_of(dev, struct channel_path, dev);
1123 return (get_chp_status(chp->id) ? sprintf(buf, "online\n") :
1124 sprintf(buf, "offline\n"));
1128 chp_status_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1130 struct channel_path *cp = container_of(dev, struct channel_path, dev);
1135 num_args = sscanf(buf, "%5s", cmd);
1139 if (!strnicmp(cmd, "on", 2))
1140 error = s390_vary_chpid(cp->id, 1);
1141 else if (!strnicmp(cmd, "off", 3))
1142 error = s390_vary_chpid(cp->id, 0);
1146 return error < 0 ? error : count;
1150 static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
1153 chp_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1155 struct channel_path *chp = container_of(dev, struct channel_path, dev);
1159 return sprintf(buf, "%x\n", chp->desc.desc);
1162 static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
1165 chp_cmg_show(struct device *dev, struct device_attribute *attr, char *buf)
1167 struct channel_path *chp = to_channelpath(dev);
1171 if (chp->cmg == -1) /* channel measurements not available */
1172 return sprintf(buf, "unknown\n");
1173 return sprintf(buf, "%x\n", chp->cmg);
1176 static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL);
1179 chp_shared_show(struct device *dev, struct device_attribute *attr, char *buf)
1181 struct channel_path *chp = to_channelpath(dev);
1185 if (chp->shared == -1) /* channel measurements not available */
1186 return sprintf(buf, "unknown\n");
1187 return sprintf(buf, "%x\n", chp->shared);
1190 static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL);
1192 static struct attribute * chp_attrs[] = {
1193 &dev_attr_status.attr,
1194 &dev_attr_type.attr,
1196 &dev_attr_shared.attr,
1200 static struct attribute_group chp_attr_group = {
1205 chp_release(struct device *dev)
1207 struct channel_path *cp;
1209 cp = container_of(dev, struct channel_path, dev);
1214 chsc_determine_channel_path_description(int chpid,
1215 struct channel_path_desc *desc)
1220 struct chsc_header request;
1222 u32 first_chpid : 8;
1226 struct chsc_header response;
1228 struct channel_path_desc desc;
1231 scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1235 scpd_area->request.length = 0x0010;
1236 scpd_area->request.code = 0x0002;
1238 scpd_area->first_chpid = chpid;
1239 scpd_area->last_chpid = chpid;
1241 ccode = chsc(scpd_area);
1243 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1247 switch (scpd_area->response.code) {
1248 case 0x0001: /* Success. */
1249 memcpy(desc, &scpd_area->desc,
1250 sizeof(struct channel_path_desc));
1253 case 0x0003: /* Invalid block. */
1254 case 0x0007: /* Invalid format. */
1255 case 0x0008: /* Other invalid block. */
1256 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
1259 case 0x0004: /* Command not provided in model. */
1260 CIO_CRW_EVENT(2, "Model does not provide scpd\n");
1264 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
1265 scpd_area->response.code);
1269 free_page((unsigned long)scpd_area);
1274 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
1275 struct cmg_chars *chars)
1280 chp->cmg_chars = kmalloc(sizeof(struct cmg_chars),
1282 if (chp->cmg_chars) {
1284 struct cmg_chars *cmg_chars;
1286 cmg_chars = chp->cmg_chars;
1287 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
1288 mask = 0x80 >> (i + 3);
1290 cmg_chars->values[i] = chars->values[i];
1292 cmg_chars->values[i] = 0;
1297 /* No cmg-dependent data. */
1303 chsc_get_channel_measurement_chars(struct channel_path *chp)
1308 struct chsc_header request;
1310 u32 first_chpid : 8;
1314 struct chsc_header response;
1325 u32 data[NR_MEASUREMENT_CHARS];
1328 scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1332 scmc_area->request.length = 0x0010;
1333 scmc_area->request.code = 0x0022;
1335 scmc_area->first_chpid = chp->id;
1336 scmc_area->last_chpid = chp->id;
1338 ccode = chsc(scmc_area);
1340 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1344 switch (scmc_area->response.code) {
1345 case 0x0001: /* Success. */
1346 if (!scmc_area->not_valid) {
1347 chp->cmg = scmc_area->cmg;
1348 chp->shared = scmc_area->shared;
1349 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1350 (struct cmg_chars *)
1358 case 0x0003: /* Invalid block. */
1359 case 0x0007: /* Invalid format. */
1360 case 0x0008: /* Invalid bit combination. */
1361 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
1364 case 0x0004: /* Command not provided. */
1365 CIO_CRW_EVENT(2, "Model does not provide scmc\n");
1369 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
1370 scmc_area->response.code);
1374 free_page((unsigned long)scmc_area);
1379 * Entries for chpids on the system bus.
1380 * This replaces /proc/chpids.
1383 new_channel_path(int chpid)
1385 struct channel_path *chp;
1388 chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
1392 /* fill in status, etc. */
1395 chp->dev = (struct device) {
1396 .parent = &css[0]->device,
1397 .release = chp_release,
1399 snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp0.%x", chpid);
1401 /* Obtain channel path description and fill it in. */
1402 ret = chsc_determine_channel_path_description(chpid, &chp->desc);
1405 /* Get channel-measurement characteristics. */
1406 if (css_characteristics_avail && css_chsc_characteristics.scmc
1407 && css_chsc_characteristics.secm) {
1408 ret = chsc_get_channel_measurement_chars(chp);
1412 static int msg_done;
1415 printk(KERN_WARNING "cio: Channel measurements not "
1416 "available, continuing.\n");
1422 /* make it known to the system */
1423 ret = device_register(&chp->dev);
1425 printk(KERN_WARNING "%s: could not register %02x\n",
1429 ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
1431 device_unregister(&chp->dev);
1434 mutex_lock(&css[0]->mutex);
1435 if (css[0]->cm_enabled) {
1436 ret = chsc_add_chp_cmg_attr(chp);
1438 sysfs_remove_group(&chp->dev.kobj, &chp_attr_group);
1439 device_unregister(&chp->dev);
1440 mutex_unlock(&css[0]->mutex);
1444 css[0]->chps[chpid] = chp;
1445 mutex_unlock(&css[0]->mutex);
1453 chsc_get_chp_desc(struct subchannel *sch, int chp_no)
1455 struct channel_path *chp;
1456 struct channel_path_desc *desc;
1458 chp = css[0]->chps[sch->schib.pmcw.chpid[chp_no]];
1461 desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
1464 memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
1470 chsc_alloc_sei_area(void)
1472 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1474 printk(KERN_WARNING"Can't allocate page for processing of " \
1475 "chsc machine checks!\n");
1476 return (sei_page ? 0 : -ENOMEM);
1480 chsc_enable_facility(int operation_code)
1484 struct chsc_header request;
1491 u32 operation_data_area[252];
1492 struct chsc_header response;
1498 sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA);
1501 sda_area->request.length = 0x0400;
1502 sda_area->request.code = 0x0031;
1503 sda_area->operation_code = operation_code;
1505 ret = chsc(sda_area);
1507 ret = (ret == 3) ? -ENODEV : -EBUSY;
1510 switch (sda_area->response.code) {
1511 case 0x0001: /* everything ok */
1514 case 0x0003: /* invalid request block */
1518 case 0x0004: /* command not provided */
1519 case 0x0101: /* facility not provided */
1522 default: /* something went wrong */
1526 free_page((unsigned long)sda_area);
1530 subsys_initcall(chsc_alloc_sei_area);
1532 struct css_general_char css_general_characteristics;
1533 struct css_chsc_char css_chsc_characteristics;
1536 chsc_determine_css_characteristics(void)
1540 struct chsc_header request;
1544 struct chsc_header response;
1546 u32 general_char[510];
1550 scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1552 printk(KERN_WARNING"cio: Was not able to determine available" \
1553 "CHSCs due to no memory.\n");
1557 scsc_area->request.length = 0x0010;
1558 scsc_area->request.code = 0x0010;
1560 result = chsc(scsc_area);
1562 printk(KERN_WARNING"cio: Was not able to determine " \
1563 "available CHSCs, cc=%i.\n", result);
1568 if (scsc_area->response.code != 1) {
1569 printk(KERN_WARNING"cio: Was not able to determine " \
1570 "available CHSCs.\n");
1574 memcpy(&css_general_characteristics, scsc_area->general_char,
1575 sizeof(css_general_characteristics));
1576 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1577 sizeof(css_chsc_characteristics));
1579 free_page ((unsigned long) scsc_area);
1583 EXPORT_SYMBOL_GPL(css_general_characteristics);
1584 EXPORT_SYMBOL_GPL(css_chsc_characteristics);