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/slab.h>
14 #include <linux/init.h>
15 #include <linux/device.h>
18 #include <asm/chpid.h>
22 #include "cio_debug.h"
27 static void *sei_page;
29 /* FIXME: this is _always_ called for every subchannel. shouldn't we
30 * process more than one at a time? */
32 chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
37 struct chsc_header request;
41 u16 f_sch; /* first subchannel */
43 u16 l_sch; /* last subchannel */
45 struct chsc_header response;
49 u8 st : 3; /* subchannel type */
51 u8 unit_addr; /* unit address */
52 u16 devno; /* device number */
55 u16 sch; /* subchannel */
56 u8 chpid[8]; /* chpids 0-7 */
57 u16 fla[8]; /* full link addresses 0-7 */
58 } __attribute__ ((packed)) *ssd_area;
62 ssd_area->request.length = 0x0010;
63 ssd_area->request.code = 0x0004;
65 ssd_area->ssid = sch->schid.ssid;
66 ssd_area->f_sch = sch->schid.sch_no;
67 ssd_area->l_sch = sch->schid.sch_no;
69 ccode = chsc(ssd_area);
71 pr_debug("chsc returned with ccode = %d\n", ccode);
72 return (ccode == 3) ? -ENODEV : -EBUSY;
75 switch (ssd_area->response.code) {
76 case 0x0001: /* everything ok */
79 CIO_CRW_EVENT(2, "Invalid command!\n");
82 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
85 CIO_CRW_EVENT(2, "Model does not provide ssd\n");
88 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
89 ssd_area->response.code);
94 * ssd_area->st stores the type of the detected
95 * subchannel, with the following definitions:
97 * 0: I/O subchannel: All fields have meaning
98 * 1: CHSC subchannel: Only sch_val, st and sch
100 * 2: Message subchannel: All fields except unit_addr
102 * 3: ADM subchannel: Only sch_val, st and sch
105 * Other types are currently undefined.
107 if (ssd_area->st > 3) { /* uhm, that looks strange... */
108 CIO_CRW_EVENT(0, "Strange subchannel type %d"
109 " for sch 0.%x.%04x\n", ssd_area->st,
110 sch->schid.ssid, sch->schid.sch_no);
112 * There may have been a new subchannel type defined in the
113 * time since this code was written; since we don't know which
114 * fields have meaning and what to do with it we just jump out
118 const char *type[4] = {"I/O", "chsc", "message", "ADM"};
119 CIO_CRW_EVENT(6, "ssd: sch 0.%x.%04x is %s subchannel\n",
120 sch->schid.ssid, sch->schid.sch_no,
123 sch->ssd_info.valid = 1;
124 sch->ssd_info.type = ssd_area->st;
127 if (ssd_area->st == 0 || ssd_area->st == 2) {
128 for (j = 0; j < 8; j++) {
129 if (!((0x80 >> j) & ssd_area->path_mask &
130 ssd_area->fla_valid_mask))
132 sch->ssd_info.chpid[j] = ssd_area->chpid[j];
133 sch->ssd_info.fla[j] = ssd_area->fla[j];
140 css_get_ssd_info(struct subchannel *sch)
145 page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
148 spin_lock_irq(sch->lock);
149 ret = chsc_get_sch_desc_irq(sch, page);
151 static int cio_chsc_err_msg;
153 if (!cio_chsc_err_msg) {
155 "chsc_get_sch_descriptions:"
156 " Error %d while doing chsc; "
157 "processing some machine checks may "
159 cio_chsc_err_msg = 1;
162 spin_unlock_irq(sch->lock);
163 free_page((unsigned long)page);
169 /* Allocate channel path structures, if needed. */
170 for (j = 0; j < 8; j++) {
172 chpid.id = sch->ssd_info.chpid[j];
173 if ((sch->schib.pmcw.pim & mask) &&
174 !chp_is_registered(chpid))
181 static int check_for_io_on_path(struct subchannel *sch, int mask)
185 cc = stsch(sch->schid, &sch->schib);
188 if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == mask)
193 static void terminate_internal_io(struct subchannel *sch)
195 if (cio_clear(sch)) {
196 /* Recheck device in case clear failed. */
198 if (device_trigger_verify(sch) != 0)
199 css_schedule_eval(sch->schid);
202 /* Request retry of internal operation. */
203 device_set_intretry(sch);
205 if (sch->driver && sch->driver->termination)
206 sch->driver->termination(&sch->dev);
210 s390_subchannel_remove_chpid(struct device *dev, void *data)
214 struct subchannel *sch;
215 struct chp_id *chpid;
218 sch = to_subchannel(dev);
220 for (j = 0; j < 8; j++) {
222 if ((sch->schib.pmcw.pim & mask) &&
223 (sch->schib.pmcw.chpid[j] == chpid->id))
229 spin_lock_irq(sch->lock);
231 stsch(sch->schid, &schib);
234 memcpy(&sch->schib, &schib, sizeof(struct schib));
235 /* Check for single path devices. */
236 if (sch->schib.pmcw.pim == 0x80)
239 if (check_for_io_on_path(sch, mask)) {
240 if (device_is_online(sch))
243 terminate_internal_io(sch);
244 /* Re-start path verification. */
245 if (sch->driver && sch->driver->verify)
246 sch->driver->verify(&sch->dev);
249 /* trigger path verification. */
250 if (sch->driver && sch->driver->verify)
251 sch->driver->verify(&sch->dev);
252 else if (sch->lpm == mask)
256 spin_unlock_irq(sch->lock);
261 spin_unlock_irq(sch->lock);
262 css_schedule_eval(sch->schid);
266 void chsc_chp_offline(struct chp_id chpid)
270 sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
271 CIO_TRACE_EVENT(2, dbf_txt);
273 if (chp_get_status(chpid) <= 0)
275 bus_for_each_dev(&css_bus_type, NULL, &chpid,
276 s390_subchannel_remove_chpid);
279 struct res_acc_data {
285 static int s390_process_res_acc_sch(struct res_acc_data *res_data,
286 struct subchannel *sch)
293 for (chp = 0; chp <= 7; chp++)
295 * check if chpid is in information updated by ssd
297 if (sch->ssd_info.valid &&
298 sch->ssd_info.chpid[chp] == res_data->chpid.id &&
299 (sch->ssd_info.fla[chp] & res_data->fla_mask)
309 * Do a stsch to update our subchannel structure with the
310 * new path information and eventually check for logically
313 ccode = stsch(sch->schid, &sch->schib);
321 s390_process_res_acc_new_sch(struct subchannel_id schid)
325 * We don't know the device yet, but since a path
326 * may be available now to the device we'll have
327 * to do recognition again.
328 * Since we don't have any idea about which chpid
329 * that beast may be on we'll have to do a stsch
330 * on all devices, grr...
332 if (stsch_err(schid, &schib))
336 /* Put it on the slow path. */
337 css_schedule_eval(schid);
342 __s390_process_res_acc(struct subchannel_id schid, void *data)
344 int chp_mask, old_lpm;
345 struct res_acc_data *res_data;
346 struct subchannel *sch;
349 sch = get_subchannel_by_schid(schid);
351 /* Check if a subchannel is newly available. */
352 return s390_process_res_acc_new_sch(schid);
354 spin_lock_irq(sch->lock);
356 chp_mask = s390_process_res_acc_sch(res_data, sch);
359 spin_unlock_irq(sch->lock);
360 put_device(&sch->dev);
364 sch->lpm = ((sch->schib.pmcw.pim &
365 sch->schib.pmcw.pam &
367 | chp_mask) & sch->opm;
368 if (!old_lpm && sch->lpm)
369 device_trigger_reprobe(sch);
370 else if (sch->driver && sch->driver->verify)
371 sch->driver->verify(&sch->dev);
373 spin_unlock_irq(sch->lock);
374 put_device(&sch->dev);
379 static void s390_process_res_acc (struct res_acc_data *res_data)
383 sprintf(dbf_txt, "accpr%x.%02x", res_data->chpid.cssid,
385 CIO_TRACE_EVENT( 2, dbf_txt);
386 if (res_data->fla != 0) {
387 sprintf(dbf_txt, "fla%x", res_data->fla);
388 CIO_TRACE_EVENT( 2, dbf_txt);
392 * I/O resources may have become accessible.
393 * Scan through all subchannels that may be concerned and
394 * do a validation on those.
395 * The more information we have (info), the less scanning
396 * will we have to do.
398 for_each_subchannel(__s390_process_res_acc, res_data);
402 __get_chpid_from_lir(void *data)
408 /* incident-node descriptor */
410 /* attached-node descriptor */
412 /* incident-specific information */
414 } __attribute__ ((packed)) *lir;
418 /* NULL link incident record */
420 if (!(lir->indesc[0]&0xc0000000))
421 /* node descriptor not valid */
423 if (!(lir->indesc[0]&0x10000000))
424 /* don't handle device-type nodes - FIXME */
426 /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
428 return (u16) (lir->indesc[0]&0x000000ff);
431 struct chsc_sei_area {
432 struct chsc_header request;
436 struct chsc_header response;
439 u8 vf; /* validity flags */
440 u8 rs; /* reporting source */
441 u8 cc; /* content code */
442 u16 fla; /* full link address */
443 u16 rsid; /* reporting source id */
446 u8 ccdf[4096 - 16 - 24]; /* content-code dependent field */
447 /* ccdf has to be big enough for a link-incident record */
448 } __attribute__ ((packed));
450 static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
455 CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
456 sei_area->rs, sei_area->rsid);
457 if (sei_area->rs != 4)
459 id = __get_chpid_from_lir(sei_area->ccdf);
461 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
465 chsc_chp_offline(chpid);
469 static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
471 struct res_acc_data res_data;
475 CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
476 "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
477 if (sei_area->rs != 4)
480 chpid.id = sei_area->rsid;
481 /* allocate a new channel path structure, if needed */
482 status = chp_get_status(chpid);
487 memset(&res_data, 0, sizeof(struct res_acc_data));
488 res_data.chpid = chpid;
489 if ((sei_area->vf & 0xc0) != 0) {
490 res_data.fla = sei_area->fla;
491 if ((sei_area->vf & 0xc0) == 0xc0)
492 /* full link address */
493 res_data.fla_mask = 0xffff;
496 res_data.fla_mask = 0xff00;
498 s390_process_res_acc(&res_data);
501 struct chp_config_data {
507 static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
509 struct chp_config_data *data;
513 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
514 if (sei_area->rs != 0)
516 data = (struct chp_config_data *) &(sei_area->ccdf);
518 for (num = 0; num <= __MAX_CHPID; num++) {
519 if (!chp_test_bit(data->map, num))
522 printk(KERN_WARNING "cio: processing configure event %d for "
523 "chpid %x.%02x\n", data->op, chpid.cssid, chpid.id);
526 chp_cfg_schedule(chpid, 1);
529 chp_cfg_schedule(chpid, 0);
532 chp_cfg_cancel_deconfigure(chpid);
538 static void chsc_process_sei(struct chsc_sei_area *sei_area)
540 /* Check if we might have lost some information. */
541 if (sei_area->flags & 0x40) {
542 CIO_CRW_EVENT(2, "chsc: event overflow\n");
543 css_schedule_eval_all();
545 /* which kind of information was stored? */
546 switch (sei_area->cc) {
547 case 1: /* link incident*/
548 chsc_process_sei_link_incident(sei_area);
550 case 2: /* i/o resource accessibiliy */
551 chsc_process_sei_res_acc(sei_area);
553 case 8: /* channel-path-configuration notification */
554 chsc_process_sei_chp_config(sei_area);
556 default: /* other stuff */
557 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
563 void chsc_process_crw(void)
565 struct chsc_sei_area *sei_area;
569 /* Access to sei_page is serialized through machine check handler
570 * thread, so no need for locking. */
573 CIO_TRACE_EVENT( 2, "prcss");
575 memset(sei_area, 0, sizeof(*sei_area));
576 sei_area->request.length = 0x0010;
577 sei_area->request.code = 0x000e;
581 if (sei_area->response.code == 0x0001) {
582 CIO_CRW_EVENT(4, "chsc: sei successful\n");
583 chsc_process_sei(sei_area);
585 CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
586 sei_area->response.code);
589 } while (sei_area->flags & 0x80);
593 __chp_add_new_sch(struct subchannel_id schid)
597 if (stsch_err(schid, &schib))
601 /* Put it on the slow path. */
602 css_schedule_eval(schid);
608 __chp_add(struct subchannel_id schid, void *data)
611 struct chp_id *chpid;
612 struct subchannel *sch;
615 sch = get_subchannel_by_schid(schid);
617 /* Check if the subchannel is now available. */
618 return __chp_add_new_sch(schid);
619 spin_lock_irq(sch->lock);
620 for (i=0; i<8; i++) {
622 if ((sch->schib.pmcw.pim & mask) &&
623 (sch->schib.pmcw.chpid[i] == chpid->id)) {
624 if (stsch(sch->schid, &sch->schib) != 0) {
626 spin_unlock_irq(sch->lock);
633 spin_unlock_irq(sch->lock);
636 sch->lpm = ((sch->schib.pmcw.pim &
637 sch->schib.pmcw.pam &
641 if (sch->driver && sch->driver->verify)
642 sch->driver->verify(&sch->dev);
644 spin_unlock_irq(sch->lock);
645 put_device(&sch->dev);
649 void chsc_chp_online(struct chp_id chpid)
653 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
654 CIO_TRACE_EVENT(2, dbf_txt);
656 if (chp_get_status(chpid) != 0)
657 for_each_subchannel(__chp_add, &chpid);
660 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
661 struct chp_id chpid, int on)
666 if (!sch->ssd_info.valid)
669 spin_lock_irqsave(sch->lock, flags);
671 for (chp = 0; chp < 8; chp++) {
672 if (sch->ssd_info.chpid[chp] != chpid.id)
676 sch->opm |= (0x80 >> chp);
677 sch->lpm |= (0x80 >> chp);
679 device_trigger_reprobe(sch);
680 else if (sch->driver && sch->driver->verify)
681 sch->driver->verify(&sch->dev);
684 sch->opm &= ~(0x80 >> chp);
685 sch->lpm &= ~(0x80 >> chp);
686 if (check_for_io_on_path(sch, (0x80 >> chp))) {
687 if (device_is_online(sch))
688 /* Path verification is done after killing. */
691 /* Kill and retry internal I/O. */
692 terminate_internal_io(sch);
693 /* Re-start path verification. */
694 if (sch->driver && sch->driver->verify)
695 sch->driver->verify(&sch->dev);
697 } else if (!sch->lpm) {
698 if (device_trigger_verify(sch) != 0)
699 css_schedule_eval(sch->schid);
700 } else if (sch->driver && sch->driver->verify)
701 sch->driver->verify(&sch->dev);
704 spin_unlock_irqrestore(sch->lock, flags);
707 static int s390_subchannel_vary_chpid_off(struct device *dev, void *data)
709 struct subchannel *sch;
710 struct chp_id *chpid;
712 sch = to_subchannel(dev);
715 __s390_subchannel_vary_chpid(sch, *chpid, 0);
719 static int s390_subchannel_vary_chpid_on(struct device *dev, void *data)
721 struct subchannel *sch;
722 struct chp_id *chpid;
724 sch = to_subchannel(dev);
727 __s390_subchannel_vary_chpid(sch, *chpid, 1);
732 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
735 struct subchannel *sch;
737 sch = get_subchannel_by_schid(schid);
739 put_device(&sch->dev);
742 if (stsch_err(schid, &schib))
745 /* Put it on the slow path. */
746 css_schedule_eval(schid);
751 * chsc_chp_vary - propagate channel-path vary operation to subchannels
752 * @chpid: channl-path ID
753 * @on: non-zero for vary online, zero for vary offline
755 int chsc_chp_vary(struct chp_id chpid, int on)
758 * Redo PathVerification on the devices the chpid connects to
761 bus_for_each_dev(&css_bus_type, NULL, &chpid, on ?
762 s390_subchannel_vary_chpid_on :
763 s390_subchannel_vary_chpid_off);
765 /* Scan for new devices on varied on path. */
766 for_each_subchannel(__s390_vary_chpid_on, NULL);
771 chsc_remove_cmg_attr(struct channel_subsystem *css)
775 for (i = 0; i <= __MAX_CHPID; i++) {
778 chp_remove_cmg_attr(css->chps[i]);
783 chsc_add_cmg_attr(struct channel_subsystem *css)
788 for (i = 0; i <= __MAX_CHPID; i++) {
791 ret = chp_add_cmg_attr(css->chps[i]);
797 for (--i; i >= 0; i--) {
800 chp_remove_cmg_attr(css->chps[i]);
806 __chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
809 struct chsc_header request;
810 u32 operation_code : 2;
819 struct chsc_header response;
824 } __attribute__ ((packed)) *secm_area;
828 secm_area->request.length = 0x0050;
829 secm_area->request.code = 0x0016;
831 secm_area->key = PAGE_DEFAULT_KEY;
832 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
833 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
835 secm_area->operation_code = enable ? 0 : 1;
837 ccode = chsc(secm_area);
839 return (ccode == 3) ? -ENODEV : -EBUSY;
841 switch (secm_area->response.code) {
842 case 0x0001: /* Success. */
845 case 0x0003: /* Invalid block. */
846 case 0x0007: /* Invalid format. */
847 case 0x0008: /* Other invalid block. */
848 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
851 case 0x0004: /* Command not provided in model. */
852 CIO_CRW_EVENT(2, "Model does not provide secm\n");
855 case 0x0102: /* cub adresses incorrect */
856 CIO_CRW_EVENT(2, "Invalid addresses in chsc request block\n");
859 case 0x0103: /* key error */
860 CIO_CRW_EVENT(2, "Access key error in secm\n");
863 case 0x0105: /* error while starting */
864 CIO_CRW_EVENT(2, "Error while starting channel measurement\n");
868 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
869 secm_area->response.code);
876 chsc_secm(struct channel_subsystem *css, int enable)
881 secm_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
885 mutex_lock(&css->mutex);
886 if (enable && !css->cm_enabled) {
887 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
888 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
889 if (!css->cub_addr1 || !css->cub_addr2) {
890 free_page((unsigned long)css->cub_addr1);
891 free_page((unsigned long)css->cub_addr2);
892 free_page((unsigned long)secm_area);
893 mutex_unlock(&css->mutex);
897 ret = __chsc_do_secm(css, enable, secm_area);
899 css->cm_enabled = enable;
900 if (css->cm_enabled) {
901 ret = chsc_add_cmg_attr(css);
903 memset(secm_area, 0, PAGE_SIZE);
904 __chsc_do_secm(css, 0, secm_area);
908 chsc_remove_cmg_attr(css);
910 if (enable && !css->cm_enabled) {
911 free_page((unsigned long)css->cub_addr1);
912 free_page((unsigned long)css->cub_addr2);
914 mutex_unlock(&css->mutex);
915 free_page((unsigned long)secm_area);
919 int chsc_determine_channel_path_description(struct chp_id chpid,
920 struct channel_path_desc *desc)
925 struct chsc_header request;
931 struct chsc_header response;
933 struct channel_path_desc desc;
934 } __attribute__ ((packed)) *scpd_area;
936 scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
940 scpd_area->request.length = 0x0010;
941 scpd_area->request.code = 0x0002;
943 scpd_area->first_chpid = chpid.id;
944 scpd_area->last_chpid = chpid.id;
946 ccode = chsc(scpd_area);
948 ret = (ccode == 3) ? -ENODEV : -EBUSY;
952 switch (scpd_area->response.code) {
953 case 0x0001: /* Success. */
954 memcpy(desc, &scpd_area->desc,
955 sizeof(struct channel_path_desc));
958 case 0x0003: /* Invalid block. */
959 case 0x0007: /* Invalid format. */
960 case 0x0008: /* Other invalid block. */
961 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
964 case 0x0004: /* Command not provided in model. */
965 CIO_CRW_EVENT(2, "Model does not provide scpd\n");
969 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
970 scpd_area->response.code);
974 free_page((unsigned long)scpd_area);
979 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
980 struct cmg_chars *chars)
985 chp->cmg_chars = kmalloc(sizeof(struct cmg_chars),
987 if (chp->cmg_chars) {
989 struct cmg_chars *cmg_chars;
991 cmg_chars = chp->cmg_chars;
992 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
993 mask = 0x80 >> (i + 3);
995 cmg_chars->values[i] = chars->values[i];
997 cmg_chars->values[i] = 0;
1002 /* No cmg-dependent data. */
1007 int chsc_get_channel_measurement_chars(struct channel_path *chp)
1012 struct chsc_header request;
1014 u32 first_chpid : 8;
1018 struct chsc_header response;
1029 u32 data[NR_MEASUREMENT_CHARS];
1030 } __attribute__ ((packed)) *scmc_area;
1032 scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1036 scmc_area->request.length = 0x0010;
1037 scmc_area->request.code = 0x0022;
1039 scmc_area->first_chpid = chp->chpid.id;
1040 scmc_area->last_chpid = chp->chpid.id;
1042 ccode = chsc(scmc_area);
1044 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1048 switch (scmc_area->response.code) {
1049 case 0x0001: /* Success. */
1050 if (!scmc_area->not_valid) {
1051 chp->cmg = scmc_area->cmg;
1052 chp->shared = scmc_area->shared;
1053 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1054 (struct cmg_chars *)
1062 case 0x0003: /* Invalid block. */
1063 case 0x0007: /* Invalid format. */
1064 case 0x0008: /* Invalid bit combination. */
1065 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
1068 case 0x0004: /* Command not provided. */
1069 CIO_CRW_EVENT(2, "Model does not provide scmc\n");
1073 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
1074 scmc_area->response.code);
1078 free_page((unsigned long)scmc_area);
1083 chsc_alloc_sei_area(void)
1085 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1087 printk(KERN_WARNING"Can't allocate page for processing of " \
1088 "chsc machine checks!\n");
1089 return (sei_page ? 0 : -ENOMEM);
1093 chsc_enable_facility(int operation_code)
1097 struct chsc_header request;
1104 u32 operation_data_area[252];
1105 struct chsc_header response;
1109 } __attribute__ ((packed)) *sda_area;
1111 sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA);
1114 sda_area->request.length = 0x0400;
1115 sda_area->request.code = 0x0031;
1116 sda_area->operation_code = operation_code;
1118 ret = chsc(sda_area);
1120 ret = (ret == 3) ? -ENODEV : -EBUSY;
1123 switch (sda_area->response.code) {
1124 case 0x0001: /* everything ok */
1127 case 0x0003: /* invalid request block */
1131 case 0x0004: /* command not provided */
1132 case 0x0101: /* facility not provided */
1135 default: /* something went wrong */
1139 free_page((unsigned long)sda_area);
1143 subsys_initcall(chsc_alloc_sei_area);
1145 struct css_general_char css_general_characteristics;
1146 struct css_chsc_char css_chsc_characteristics;
1149 chsc_determine_css_characteristics(void)
1153 struct chsc_header request;
1157 struct chsc_header response;
1159 u32 general_char[510];
1161 } __attribute__ ((packed)) *scsc_area;
1163 scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1165 printk(KERN_WARNING"cio: Was not able to determine available" \
1166 "CHSCs due to no memory.\n");
1170 scsc_area->request.length = 0x0010;
1171 scsc_area->request.code = 0x0010;
1173 result = chsc(scsc_area);
1175 printk(KERN_WARNING"cio: Was not able to determine " \
1176 "available CHSCs, cc=%i.\n", result);
1181 if (scsc_area->response.code != 1) {
1182 printk(KERN_WARNING"cio: Was not able to determine " \
1183 "available CHSCs.\n");
1187 memcpy(&css_general_characteristics, scsc_area->general_char,
1188 sizeof(css_general_characteristics));
1189 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1190 sizeof(css_chsc_characteristics));
1192 free_page ((unsigned long) scsc_area);
1196 EXPORT_SYMBOL_GPL(css_general_characteristics);
1197 EXPORT_SYMBOL_GPL(css_chsc_characteristics);