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) &&
255 if (sch->driver && sch->driver->termination)
256 sch->driver->termination(&sch->dev);
260 /* trigger path verification. */
261 if (sch->driver && sch->driver->verify)
262 sch->driver->verify(&sch->dev);
264 spin_unlock_irq(&sch->lock);
267 spin_unlock_irq(&sch->lock);
269 if (css_enqueue_subchannel_slow(sch->schid)) {
270 css_clear_subchannel_slow_list();
277 s390_set_chpid_offline( __u8 chpid)
282 sprintf(dbf_txt, "chpr%x", chpid);
283 CIO_TRACE_EVENT(2, dbf_txt);
285 if (get_chp_status(chpid) <= 0)
287 dev = get_device(&css[0]->chps[chpid]->dev);
288 bus_for_each_dev(&css_bus_type, NULL, to_channelpath(dev),
289 s390_subchannel_remove_chpid);
291 if (need_rescan || css_slow_subchannels_exist())
292 queue_work(slow_path_wq, &slow_path_work);
296 struct res_acc_data {
297 struct channel_path *chp;
303 s390_process_res_acc_sch(struct res_acc_data *res_data, struct subchannel *sch)
310 for (chp = 0; chp <= 7; chp++)
312 * check if chpid is in information updated by ssd
314 if (sch->ssd_info.valid &&
315 sch->ssd_info.chpid[chp] == res_data->chp->id &&
316 (sch->ssd_info.fla[chp] & res_data->fla_mask)
326 * Do a stsch to update our subchannel structure with the
327 * new path information and eventually check for logically
330 ccode = stsch(sch->schid, &sch->schib);
338 s390_process_res_acc_new_sch(struct subchannel_id schid)
343 * We don't know the device yet, but since a path
344 * may be available now to the device we'll have
345 * to do recognition again.
346 * Since we don't have any idea about which chpid
347 * that beast may be on we'll have to do a stsch
348 * on all devices, grr...
350 if (stsch_err(schid, &schib))
352 return need_rescan ? -EAGAIN : -ENXIO;
354 /* Put it on the slow path. */
355 ret = css_enqueue_subchannel_slow(schid);
357 css_clear_subchannel_slow_list();
365 __s390_process_res_acc(struct subchannel_id schid, void *data)
367 int chp_mask, old_lpm;
368 struct res_acc_data *res_data;
369 struct subchannel *sch;
371 res_data = (struct res_acc_data *)data;
372 sch = get_subchannel_by_schid(schid);
374 /* Check if a subchannel is newly available. */
375 return s390_process_res_acc_new_sch(schid);
377 spin_lock_irq(&sch->lock);
379 chp_mask = s390_process_res_acc_sch(res_data, sch);
382 spin_unlock_irq(&sch->lock);
386 sch->lpm = ((sch->schib.pmcw.pim &
387 sch->schib.pmcw.pam &
389 | chp_mask) & sch->opm;
390 if (!old_lpm && sch->lpm)
391 device_trigger_reprobe(sch);
392 else if (sch->driver && sch->driver->verify)
393 sch->driver->verify(&sch->dev);
395 spin_unlock_irq(&sch->lock);
396 put_device(&sch->dev);
397 return (res_data->fla_mask == 0xffff) ? -ENODEV : 0;
402 s390_process_res_acc (struct res_acc_data *res_data)
407 sprintf(dbf_txt, "accpr%x", res_data->chp->id);
408 CIO_TRACE_EVENT( 2, dbf_txt);
409 if (res_data->fla != 0) {
410 sprintf(dbf_txt, "fla%x", res_data->fla);
411 CIO_TRACE_EVENT( 2, dbf_txt);
415 * I/O resources may have become accessible.
416 * Scan through all subchannels that may be concerned and
417 * do a validation on those.
418 * The more information we have (info), the less scanning
419 * will we have to do.
421 rc = for_each_subchannel(__s390_process_res_acc, res_data);
422 if (css_slow_subchannels_exist())
424 else if (rc != -EAGAIN)
430 __get_chpid_from_lir(void *data)
436 /* incident-node descriptor */
438 /* attached-node descriptor */
440 /* incident-specific information */
444 lir = (struct lir*) data;
446 /* NULL link incident record */
448 if (!(lir->indesc[0]&0xc0000000))
449 /* node descriptor not valid */
451 if (!(lir->indesc[0]&0x10000000))
452 /* don't handle device-type nodes - FIXME */
454 /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
456 return (u16) (lir->indesc[0]&0x000000ff);
460 chsc_process_crw(void)
463 struct res_acc_data res_data;
465 struct chsc_header request;
469 struct chsc_header response;
472 u8 vf; /* validity flags */
473 u8 rs; /* reporting source */
474 u8 cc; /* content code */
475 u16 fla; /* full link address */
476 u16 rsid; /* reporting source id */
479 u32 ccdf[96]; /* content-code dependent field */
480 /* ccdf has to be big enough for a link-incident record */
486 * build the chsc request block for store event information
488 * This function is only called by the machine check handler thread,
489 * so we don't need locking for the sei_page.
493 CIO_TRACE_EVENT( 2, "prcss");
498 memset(sei_area, 0, sizeof(*sei_area));
499 memset(&res_data, 0, sizeof(struct res_acc_data));
500 sei_area->request.length = 0x0010;
501 sei_area->request.code = 0x000e;
503 ccode = chsc(sei_area);
507 switch (sei_area->response.code) {
508 /* for debug purposes, check for problems */
510 CIO_CRW_EVENT(4, "chsc_process_crw: event information "
511 "successfully stored\n");
512 break; /* everything ok */
515 "chsc_process_crw: invalid command!\n");
518 CIO_CRW_EVENT(2, "chsc_process_crw: error in chsc "
522 CIO_CRW_EVENT(2, "chsc_process_crw: no event "
523 "information stored\n");
526 CIO_CRW_EVENT(2, "chsc_process_crw: chsc response %d\n",
527 sei_area->response.code);
531 /* Check if we might have lost some information. */
532 if (sei_area->flags & 0x40)
533 CIO_CRW_EVENT(2, "chsc_process_crw: Event information "
534 "has been lost due to overflow!\n");
536 if (sei_area->rs != 4) {
537 CIO_CRW_EVENT(2, "chsc_process_crw: reporting source "
538 "(%04X) isn't a chpid!\n",
543 /* which kind of information was stored? */
544 switch (sei_area->cc) {
545 case 1: /* link incident*/
546 CIO_CRW_EVENT(4, "chsc_process_crw: "
547 "channel subsystem reports link incident,"
548 " reporting source is chpid %x\n",
550 chpid = __get_chpid_from_lir(sei_area->ccdf);
552 CIO_CRW_EVENT(4, "%s: Invalid LIR, skipping\n",
555 s390_set_chpid_offline(chpid);
558 case 2: /* i/o resource accessibiliy */
559 CIO_CRW_EVENT(4, "chsc_process_crw: "
560 "channel subsystem reports some I/O "
561 "devices may have become accessible\n");
562 pr_debug("Data received after sei: \n");
563 pr_debug("Validity flags: %x\n", sei_area->vf);
565 /* allocate a new channel path structure, if needed */
566 status = get_chp_status(sei_area->rsid);
568 new_channel_path(sei_area->rsid);
571 dev = get_device(&css[0]->chps[sei_area->rsid]->dev);
572 res_data.chp = to_channelpath(dev);
573 pr_debug("chpid: %x", sei_area->rsid);
574 if ((sei_area->vf & 0xc0) != 0) {
575 res_data.fla = sei_area->fla;
576 if ((sei_area->vf & 0xc0) == 0xc0) {
577 pr_debug(" full link addr: %x",
579 res_data.fla_mask = 0xffff;
581 pr_debug(" link addr: %x",
583 res_data.fla_mask = 0xff00;
586 ret = s390_process_res_acc(&res_data);
591 default: /* other stuff */
592 CIO_CRW_EVENT(4, "chsc_process_crw: event %d\n",
596 } while (sei_area->flags & 0x80);
601 __chp_add_new_sch(struct subchannel_id schid)
606 if (stsch(schid, &schib))
608 return need_rescan ? -EAGAIN : -ENXIO;
610 /* Put it on the slow path. */
611 ret = css_enqueue_subchannel_slow(schid);
613 css_clear_subchannel_slow_list();
622 __chp_add(struct subchannel_id schid, void *data)
625 struct channel_path *chp;
626 struct subchannel *sch;
628 chp = (struct channel_path *)data;
629 sch = get_subchannel_by_schid(schid);
631 /* Check if the subchannel is now available. */
632 return __chp_add_new_sch(schid);
633 spin_lock_irq(&sch->lock);
635 if (sch->schib.pmcw.chpid[i] == chp->id) {
636 if (stsch(sch->schid, &sch->schib) != 0) {
638 spin_unlock_irq(&sch->lock);
644 spin_unlock_irq(&sch->lock);
647 sch->lpm = ((sch->schib.pmcw.pim &
648 sch->schib.pmcw.pam &
650 | 0x80 >> i) & sch->opm;
652 if (sch->driver && sch->driver->verify)
653 sch->driver->verify(&sch->dev);
655 spin_unlock_irq(&sch->lock);
656 put_device(&sch->dev);
667 if (!get_chp_status(chpid))
668 return 0; /* no need to do the rest */
670 sprintf(dbf_txt, "cadd%x", chpid);
671 CIO_TRACE_EVENT(2, dbf_txt);
673 dev = get_device(&css[0]->chps[chpid]->dev);
674 rc = for_each_subchannel(__chp_add, to_channelpath(dev));
675 if (css_slow_subchannels_exist())
684 * Handling of crw machine checks with channel path source.
687 chp_process_crw(int chpid, int on)
690 /* Path has gone. We use the link incident routine.*/
691 s390_set_chpid_offline(chpid);
692 return 0; /* De-register is async anyway. */
695 * Path has come. Allocate a new channel path structure,
698 if (get_chp_status(chpid) < 0)
699 new_channel_path(chpid);
700 /* Avoid the extra overhead in process_rec_acc. */
701 return chp_add(chpid);
705 __check_for_io_and_kill(struct subchannel *sch, int index)
709 if (!device_is_online(sch))
710 /* cio could be doing I/O. */
712 cc = stsch(sch->schid, &sch->schib);
715 if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == (0x80 >> index)) {
716 device_set_waiting(sch);
723 __s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on)
728 if (!sch->ssd_info.valid)
731 spin_lock_irqsave(&sch->lock, flags);
733 for (chp = 0; chp < 8; chp++) {
734 if (sch->ssd_info.chpid[chp] != chpid)
738 sch->opm |= (0x80 >> chp);
739 sch->lpm |= (0x80 >> chp);
741 device_trigger_reprobe(sch);
742 else if (sch->driver && sch->driver->verify)
743 sch->driver->verify(&sch->dev);
745 sch->opm &= ~(0x80 >> chp);
746 sch->lpm &= ~(0x80 >> chp);
748 * Give running I/O a grace period in which it
749 * can successfully terminate, even using the
750 * just varied off path. Then kill it.
752 if (!__check_for_io_and_kill(sch, chp) && !sch->lpm) {
753 if (css_enqueue_subchannel_slow(sch->schid)) {
754 css_clear_subchannel_slow_list();
757 } else if (sch->driver && sch->driver->verify)
758 sch->driver->verify(&sch->dev);
762 spin_unlock_irqrestore(&sch->lock, flags);
766 s390_subchannel_vary_chpid_off(struct device *dev, void *data)
768 struct subchannel *sch;
771 sch = to_subchannel(dev);
774 __s390_subchannel_vary_chpid(sch, *chpid, 0);
779 s390_subchannel_vary_chpid_on(struct device *dev, void *data)
781 struct subchannel *sch;
784 sch = to_subchannel(dev);
787 __s390_subchannel_vary_chpid(sch, *chpid, 1);
792 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
795 struct subchannel *sch;
797 sch = get_subchannel_by_schid(schid);
799 put_device(&sch->dev);
802 if (stsch_err(schid, &schib))
805 /* Put it on the slow path. */
806 if (css_enqueue_subchannel_slow(schid)) {
807 css_clear_subchannel_slow_list();
815 * Function: s390_vary_chpid
816 * Varies the specified chpid online or offline
819 s390_vary_chpid( __u8 chpid, int on)
824 sprintf(dbf_text, on?"varyon%x":"varyoff%x", chpid);
825 CIO_TRACE_EVENT( 2, dbf_text);
827 status = get_chp_status(chpid);
829 printk(KERN_ERR "Can't vary unknown chpid %02X\n", chpid);
833 if (!on && !status) {
834 printk(KERN_ERR "chpid %x is already offline\n", chpid);
838 set_chp_logically_online(chpid, on);
841 * Redo PathVerification on the devices the chpid connects to
844 bus_for_each_dev(&css_bus_type, NULL, &chpid, on ?
845 s390_subchannel_vary_chpid_on :
846 s390_subchannel_vary_chpid_off);
848 /* Scan for new devices on varied on path. */
849 for_each_subchannel(__s390_vary_chpid_on, NULL);
850 if (need_rescan || css_slow_subchannels_exist())
851 queue_work(slow_path_wq, &slow_path_work);
856 * Channel measurement related functions
859 chp_measurement_chars_read(struct kobject *kobj, char *buf, loff_t off,
862 struct channel_path *chp;
865 chp = to_channelpath(container_of(kobj, struct device, kobj));
869 size = sizeof(struct cmg_chars);
873 if (off + count > size)
875 memcpy(buf, chp->cmg_chars + off, count);
879 static struct bin_attribute chp_measurement_chars_attr = {
881 .name = "measurement_chars",
883 .owner = THIS_MODULE,
885 .size = sizeof(struct cmg_chars),
886 .read = chp_measurement_chars_read,
890 chp_measurement_copy_block(struct cmg_entry *buf,
891 struct channel_subsystem *css, int chpid)
894 struct cmg_entry *entry, reference_buf;
898 area = css->cub_addr1;
901 area = css->cub_addr2;
904 entry = area + (idx * sizeof(struct cmg_entry));
906 memcpy(buf, entry, sizeof(*entry));
907 memcpy(&reference_buf, entry, sizeof(*entry));
908 } while (reference_buf.values[0] != buf->values[0]);
912 chp_measurement_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
914 struct channel_path *chp;
915 struct channel_subsystem *css;
918 chp = to_channelpath(container_of(kobj, struct device, kobj));
919 css = to_css(chp->dev.parent);
921 size = sizeof(struct cmg_entry);
923 /* Only allow single reads. */
924 if (off || count < size)
926 chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->id);
931 static struct bin_attribute chp_measurement_attr = {
933 .name = "measurement",
935 .owner = THIS_MODULE,
937 .size = sizeof(struct cmg_entry),
938 .read = chp_measurement_read,
942 chsc_remove_chp_cmg_attr(struct channel_path *chp)
944 sysfs_remove_bin_file(&chp->dev.kobj, &chp_measurement_chars_attr);
945 sysfs_remove_bin_file(&chp->dev.kobj, &chp_measurement_attr);
949 chsc_add_chp_cmg_attr(struct channel_path *chp)
953 ret = sysfs_create_bin_file(&chp->dev.kobj,
954 &chp_measurement_chars_attr);
957 ret = sysfs_create_bin_file(&chp->dev.kobj, &chp_measurement_attr);
959 sysfs_remove_bin_file(&chp->dev.kobj,
960 &chp_measurement_chars_attr);
965 chsc_remove_cmg_attr(struct channel_subsystem *css)
969 for (i = 0; i <= __MAX_CHPID; i++) {
972 chsc_remove_chp_cmg_attr(css->chps[i]);
977 chsc_add_cmg_attr(struct channel_subsystem *css)
982 for (i = 0; i <= __MAX_CHPID; i++) {
985 ret = chsc_add_chp_cmg_attr(css->chps[i]);
991 for (--i; i >= 0; i--) {
994 chsc_remove_chp_cmg_attr(css->chps[i]);
1001 __chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
1004 struct chsc_header request;
1005 u32 operation_code : 2;
1014 struct chsc_header response;
1023 secm_area->request.length = 0x0050;
1024 secm_area->request.code = 0x0016;
1026 secm_area->key = PAGE_DEFAULT_KEY;
1027 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
1028 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
1030 secm_area->operation_code = enable ? 0 : 1;
1032 ccode = chsc(secm_area);
1034 return (ccode == 3) ? -ENODEV : -EBUSY;
1036 switch (secm_area->response.code) {
1037 case 0x0001: /* Success. */
1040 case 0x0003: /* Invalid block. */
1041 case 0x0007: /* Invalid format. */
1042 case 0x0008: /* Other invalid block. */
1043 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
1046 case 0x0004: /* Command not provided in model. */
1047 CIO_CRW_EVENT(2, "Model does not provide secm\n");
1050 case 0x0102: /* cub adresses incorrect */
1051 CIO_CRW_EVENT(2, "Invalid addresses in chsc request block\n");
1054 case 0x0103: /* key error */
1055 CIO_CRW_EVENT(2, "Access key error in secm\n");
1058 case 0x0105: /* error while starting */
1059 CIO_CRW_EVENT(2, "Error while starting channel measurement\n");
1063 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
1064 secm_area->response.code);
1071 chsc_secm(struct channel_subsystem *css, int enable)
1076 secm_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1080 mutex_lock(&css->mutex);
1081 if (enable && !css->cm_enabled) {
1082 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1083 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1084 if (!css->cub_addr1 || !css->cub_addr2) {
1085 free_page((unsigned long)css->cub_addr1);
1086 free_page((unsigned long)css->cub_addr2);
1087 free_page((unsigned long)secm_area);
1088 mutex_unlock(&css->mutex);
1092 ret = __chsc_do_secm(css, enable, secm_area);
1094 css->cm_enabled = enable;
1095 if (css->cm_enabled) {
1096 ret = chsc_add_cmg_attr(css);
1098 memset(secm_area, 0, PAGE_SIZE);
1099 __chsc_do_secm(css, 0, secm_area);
1100 css->cm_enabled = 0;
1103 chsc_remove_cmg_attr(css);
1105 if (enable && !css->cm_enabled) {
1106 free_page((unsigned long)css->cub_addr1);
1107 free_page((unsigned long)css->cub_addr2);
1109 mutex_unlock(&css->mutex);
1110 free_page((unsigned long)secm_area);
1115 * Files for the channel path entries.
1118 chp_status_show(struct device *dev, struct device_attribute *attr, char *buf)
1120 struct channel_path *chp = container_of(dev, struct channel_path, dev);
1124 return (get_chp_status(chp->id) ? sprintf(buf, "online\n") :
1125 sprintf(buf, "offline\n"));
1129 chp_status_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1131 struct channel_path *cp = container_of(dev, struct channel_path, dev);
1136 num_args = sscanf(buf, "%5s", cmd);
1140 if (!strnicmp(cmd, "on", 2))
1141 error = s390_vary_chpid(cp->id, 1);
1142 else if (!strnicmp(cmd, "off", 3))
1143 error = s390_vary_chpid(cp->id, 0);
1147 return error < 0 ? error : count;
1151 static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
1154 chp_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1156 struct channel_path *chp = container_of(dev, struct channel_path, dev);
1160 return sprintf(buf, "%x\n", chp->desc.desc);
1163 static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
1166 chp_cmg_show(struct device *dev, struct device_attribute *attr, char *buf)
1168 struct channel_path *chp = to_channelpath(dev);
1172 if (chp->cmg == -1) /* channel measurements not available */
1173 return sprintf(buf, "unknown\n");
1174 return sprintf(buf, "%x\n", chp->cmg);
1177 static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL);
1180 chp_shared_show(struct device *dev, struct device_attribute *attr, char *buf)
1182 struct channel_path *chp = to_channelpath(dev);
1186 if (chp->shared == -1) /* channel measurements not available */
1187 return sprintf(buf, "unknown\n");
1188 return sprintf(buf, "%x\n", chp->shared);
1191 static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL);
1193 static struct attribute * chp_attrs[] = {
1194 &dev_attr_status.attr,
1195 &dev_attr_type.attr,
1197 &dev_attr_shared.attr,
1201 static struct attribute_group chp_attr_group = {
1206 chp_release(struct device *dev)
1208 struct channel_path *cp;
1210 cp = container_of(dev, struct channel_path, dev);
1215 chsc_determine_channel_path_description(int chpid,
1216 struct channel_path_desc *desc)
1221 struct chsc_header request;
1223 u32 first_chpid : 8;
1227 struct chsc_header response;
1229 struct channel_path_desc desc;
1232 scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1236 scpd_area->request.length = 0x0010;
1237 scpd_area->request.code = 0x0002;
1239 scpd_area->first_chpid = chpid;
1240 scpd_area->last_chpid = chpid;
1242 ccode = chsc(scpd_area);
1244 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1248 switch (scpd_area->response.code) {
1249 case 0x0001: /* Success. */
1250 memcpy(desc, &scpd_area->desc,
1251 sizeof(struct channel_path_desc));
1254 case 0x0003: /* Invalid block. */
1255 case 0x0007: /* Invalid format. */
1256 case 0x0008: /* Other invalid block. */
1257 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
1260 case 0x0004: /* Command not provided in model. */
1261 CIO_CRW_EVENT(2, "Model does not provide scpd\n");
1265 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
1266 scpd_area->response.code);
1270 free_page((unsigned long)scpd_area);
1275 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
1276 struct cmg_chars *chars)
1281 chp->cmg_chars = kmalloc(sizeof(struct cmg_chars),
1283 if (chp->cmg_chars) {
1285 struct cmg_chars *cmg_chars;
1287 cmg_chars = chp->cmg_chars;
1288 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
1289 mask = 0x80 >> (i + 3);
1291 cmg_chars->values[i] = chars->values[i];
1293 cmg_chars->values[i] = 0;
1298 /* No cmg-dependent data. */
1304 chsc_get_channel_measurement_chars(struct channel_path *chp)
1309 struct chsc_header request;
1311 u32 first_chpid : 8;
1315 struct chsc_header response;
1326 u32 data[NR_MEASUREMENT_CHARS];
1329 scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1333 scmc_area->request.length = 0x0010;
1334 scmc_area->request.code = 0x0022;
1336 scmc_area->first_chpid = chp->id;
1337 scmc_area->last_chpid = chp->id;
1339 ccode = chsc(scmc_area);
1341 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1345 switch (scmc_area->response.code) {
1346 case 0x0001: /* Success. */
1347 if (!scmc_area->not_valid) {
1348 chp->cmg = scmc_area->cmg;
1349 chp->shared = scmc_area->shared;
1350 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1351 (struct cmg_chars *)
1359 case 0x0003: /* Invalid block. */
1360 case 0x0007: /* Invalid format. */
1361 case 0x0008: /* Invalid bit combination. */
1362 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
1365 case 0x0004: /* Command not provided. */
1366 CIO_CRW_EVENT(2, "Model does not provide scmc\n");
1370 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
1371 scmc_area->response.code);
1375 free_page((unsigned long)scmc_area);
1380 * Entries for chpids on the system bus.
1381 * This replaces /proc/chpids.
1384 new_channel_path(int chpid)
1386 struct channel_path *chp;
1389 chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
1393 /* fill in status, etc. */
1396 chp->dev = (struct device) {
1397 .parent = &css[0]->device,
1398 .release = chp_release,
1400 snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp0.%x", chpid);
1402 /* Obtain channel path description and fill it in. */
1403 ret = chsc_determine_channel_path_description(chpid, &chp->desc);
1406 /* Get channel-measurement characteristics. */
1407 if (css_characteristics_avail && css_chsc_characteristics.scmc
1408 && css_chsc_characteristics.secm) {
1409 ret = chsc_get_channel_measurement_chars(chp);
1413 static int msg_done;
1416 printk(KERN_WARNING "cio: Channel measurements not "
1417 "available, continuing.\n");
1423 /* make it known to the system */
1424 ret = device_register(&chp->dev);
1426 printk(KERN_WARNING "%s: could not register %02x\n",
1430 ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
1432 device_unregister(&chp->dev);
1435 mutex_lock(&css[0]->mutex);
1436 if (css[0]->cm_enabled) {
1437 ret = chsc_add_chp_cmg_attr(chp);
1439 sysfs_remove_group(&chp->dev.kobj, &chp_attr_group);
1440 device_unregister(&chp->dev);
1441 mutex_unlock(&css[0]->mutex);
1445 css[0]->chps[chpid] = chp;
1446 mutex_unlock(&css[0]->mutex);
1454 chsc_get_chp_desc(struct subchannel *sch, int chp_no)
1456 struct channel_path *chp;
1457 struct channel_path_desc *desc;
1459 chp = css[0]->chps[sch->schib.pmcw.chpid[chp_no]];
1462 desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
1465 memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
1471 chsc_alloc_sei_area(void)
1473 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1475 printk(KERN_WARNING"Can't allocate page for processing of " \
1476 "chsc machine checks!\n");
1477 return (sei_page ? 0 : -ENOMEM);
1481 chsc_enable_facility(int operation_code)
1485 struct chsc_header request;
1492 u32 operation_data_area[252];
1493 struct chsc_header response;
1499 sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA);
1502 sda_area->request.length = 0x0400;
1503 sda_area->request.code = 0x0031;
1504 sda_area->operation_code = operation_code;
1506 ret = chsc(sda_area);
1508 ret = (ret == 3) ? -ENODEV : -EBUSY;
1511 switch (sda_area->response.code) {
1512 case 0x0001: /* everything ok */
1515 case 0x0003: /* invalid request block */
1519 case 0x0004: /* command not provided */
1520 case 0x0101: /* facility not provided */
1523 default: /* something went wrong */
1527 free_page((unsigned long)sda_area);
1531 subsys_initcall(chsc_alloc_sei_area);
1533 struct css_general_char css_general_characteristics;
1534 struct css_chsc_char css_chsc_characteristics;
1537 chsc_determine_css_characteristics(void)
1541 struct chsc_header request;
1545 struct chsc_header response;
1547 u32 general_char[510];
1551 scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1553 printk(KERN_WARNING"cio: Was not able to determine available" \
1554 "CHSCs due to no memory.\n");
1558 scsc_area->request.length = 0x0010;
1559 scsc_area->request.code = 0x0010;
1561 result = chsc(scsc_area);
1563 printk(KERN_WARNING"cio: Was not able to determine " \
1564 "available CHSCs, cc=%i.\n", result);
1569 if (scsc_area->response.code != 1) {
1570 printk(KERN_WARNING"cio: Was not able to determine " \
1571 "available CHSCs.\n");
1575 memcpy(&css_general_characteristics, scsc_area->general_char,
1576 sizeof(css_general_characteristics));
1577 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1578 sizeof(css_chsc_characteristics));
1580 free_page ((unsigned long) scsc_area);
1584 EXPORT_SYMBOL_GPL(css_general_characteristics);
1585 EXPORT_SYMBOL_GPL(css_chsc_characteristics);