2 * S/390 common I/O routines -- channel subsystem call
4 * Copyright IBM Corp. 1999,2012
5 * Author(s): Ingo Adlung (adlung@de.ibm.com)
6 * Cornelia Huck (cornelia.huck@de.ibm.com)
7 * Arnd Bergmann (arndb@de.ibm.com)
10 #define KMSG_COMPONENT "cio"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/device.h>
17 #include <linux/pci.h>
20 #include <asm/chpid.h>
26 #include "cio_debug.h"
31 static void *sei_page;
32 static void *chsc_page;
33 static DEFINE_SPINLOCK(chsc_page_lock);
36 * chsc_error_from_response() - convert a chsc response to an error
37 * @response: chsc response code
39 * Returns an appropriate Linux error code for @response.
41 int chsc_error_from_response(int response)
65 EXPORT_SYMBOL_GPL(chsc_error_from_response);
67 struct chsc_ssd_area {
68 struct chsc_header request;
72 u16 f_sch; /* first subchannel */
74 u16 l_sch; /* last subchannel */
76 struct chsc_header response;
80 u8 st : 3; /* subchannel type */
82 u8 unit_addr; /* unit address */
83 u16 devno; /* device number */
86 u16 sch; /* subchannel */
87 u8 chpid[8]; /* chpids 0-7 */
88 u16 fla[8]; /* full link addresses 0-7 */
89 } __attribute__ ((packed));
91 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
93 struct chsc_ssd_area *ssd_area;
99 spin_lock_irq(&chsc_page_lock);
100 memset(chsc_page, 0, PAGE_SIZE);
101 ssd_area = chsc_page;
102 ssd_area->request.length = 0x0010;
103 ssd_area->request.code = 0x0004;
104 ssd_area->ssid = schid.ssid;
105 ssd_area->f_sch = schid.sch_no;
106 ssd_area->l_sch = schid.sch_no;
108 ccode = chsc(ssd_area);
109 /* Check response. */
111 ret = (ccode == 3) ? -ENODEV : -EBUSY;
114 ret = chsc_error_from_response(ssd_area->response.code);
116 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
117 schid.ssid, schid.sch_no,
118 ssd_area->response.code);
121 if (!ssd_area->sch_valid) {
127 memset(ssd, 0, sizeof(struct chsc_ssd_info));
128 if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
129 (ssd_area->st != SUBCHANNEL_TYPE_MSG))
131 ssd->path_mask = ssd_area->path_mask;
132 ssd->fla_valid_mask = ssd_area->fla_valid_mask;
133 for (i = 0; i < 8; i++) {
135 if (ssd_area->path_mask & mask) {
136 chp_id_init(&ssd->chpid[i]);
137 ssd->chpid[i].id = ssd_area->chpid[i];
139 if (ssd_area->fla_valid_mask & mask)
140 ssd->fla[i] = ssd_area->fla[i];
143 spin_unlock_irq(&chsc_page_lock);
147 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
149 spin_lock_irq(sch->lock);
150 if (sch->driver && sch->driver->chp_event)
151 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
153 spin_unlock_irq(sch->lock);
158 spin_unlock_irq(sch->lock);
159 css_schedule_eval(sch->schid);
163 void chsc_chp_offline(struct chp_id chpid)
166 struct chp_link link;
168 sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
169 CIO_TRACE_EVENT(2, dbf_txt);
171 if (chp_get_status(chpid) <= 0)
173 memset(&link, 0, sizeof(struct chp_link));
175 /* Wait until previous actions have settled. */
176 css_wait_for_slow_path();
177 for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
180 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
184 * We don't know the device yet, but since a path
185 * may be available now to the device we'll have
186 * to do recognition again.
187 * Since we don't have any idea about which chpid
188 * that beast may be on we'll have to do a stsch
189 * on all devices, grr...
191 if (stsch_err(schid, &schib))
195 /* Put it on the slow path. */
196 css_schedule_eval(schid);
200 static int __s390_process_res_acc(struct subchannel *sch, void *data)
202 spin_lock_irq(sch->lock);
203 if (sch->driver && sch->driver->chp_event)
204 sch->driver->chp_event(sch, data, CHP_ONLINE);
205 spin_unlock_irq(sch->lock);
210 static void s390_process_res_acc(struct chp_link *link)
214 sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
216 CIO_TRACE_EVENT( 2, dbf_txt);
217 if (link->fla != 0) {
218 sprintf(dbf_txt, "fla%x", link->fla);
219 CIO_TRACE_EVENT( 2, dbf_txt);
221 /* Wait until previous actions have settled. */
222 css_wait_for_slow_path();
224 * I/O resources may have become accessible.
225 * Scan through all subchannels that may be concerned and
226 * do a validation on those.
227 * The more information we have (info), the less scanning
228 * will we have to do.
230 for_each_subchannel_staged(__s390_process_res_acc,
231 s390_process_res_acc_new_sch, link);
235 __get_chpid_from_lir(void *data)
241 /* incident-node descriptor */
243 /* attached-node descriptor */
245 /* incident-specific information */
247 } __attribute__ ((packed)) *lir;
251 /* NULL link incident record */
253 if (!(lir->indesc[0]&0xc0000000))
254 /* node descriptor not valid */
256 if (!(lir->indesc[0]&0x10000000))
257 /* don't handle device-type nodes - FIXME */
259 /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
261 return (u16) (lir->indesc[0]&0x000000ff);
264 struct chsc_sei_nt0_area {
266 u8 vf; /* validity flags */
267 u8 rs; /* reporting source */
268 u8 cc; /* content code */
269 u16 fla; /* full link address */
270 u16 rsid; /* reporting source id */
273 /* ccdf has to be big enough for a link-incident record */
274 u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */
277 struct chsc_sei_nt2_area {
278 u8 flags; /* p and v bit */
281 u8 cc; /* content code */
283 u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */
286 #define CHSC_SEI_NT0 (1ULL << 63)
287 #define CHSC_SEI_NT2 (1ULL << 61)
290 struct chsc_header request;
292 u64 ntsm; /* notification type mask */
293 struct chsc_header response;
297 struct chsc_sei_nt0_area nt0_area;
298 struct chsc_sei_nt2_area nt2_area;
299 u8 nt_area[PAGE_SIZE - 24];
303 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
308 CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
309 sei_area->rs, sei_area->rsid);
310 if (sei_area->rs != 4)
312 id = __get_chpid_from_lir(sei_area->ccdf);
314 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
318 chsc_chp_offline(chpid);
322 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
324 struct chp_link link;
328 CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
329 "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
330 if (sei_area->rs != 4)
333 chpid.id = sei_area->rsid;
334 /* allocate a new channel path structure, if needed */
335 status = chp_get_status(chpid);
340 memset(&link, 0, sizeof(struct chp_link));
342 if ((sei_area->vf & 0xc0) != 0) {
343 link.fla = sei_area->fla;
344 if ((sei_area->vf & 0xc0) == 0xc0)
345 /* full link address */
346 link.fla_mask = 0xffff;
349 link.fla_mask = 0xff00;
351 s390_process_res_acc(&link);
354 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
356 struct channel_path *chp;
361 CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
362 if (sei_area->rs != 0)
364 data = sei_area->ccdf;
366 for (num = 0; num <= __MAX_CHPID; num++) {
367 if (!chp_test_bit(data, num))
371 CIO_CRW_EVENT(4, "Update information for channel path "
372 "%x.%02x\n", chpid.cssid, chpid.id);
373 chp = chpid_to_chp(chpid);
378 mutex_lock(&chp->lock);
379 chp_update_desc(chp);
380 mutex_unlock(&chp->lock);
384 struct chp_config_data {
390 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
392 struct chp_config_data *data;
395 char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
397 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
398 if (sei_area->rs != 0)
400 data = (struct chp_config_data *) &(sei_area->ccdf);
402 for (num = 0; num <= __MAX_CHPID; num++) {
403 if (!chp_test_bit(data->map, num))
406 pr_notice("Processing %s for channel path %x.%02x\n",
407 events[data->op], chpid.cssid, chpid.id);
410 chp_cfg_schedule(chpid, 1);
413 chp_cfg_schedule(chpid, 0);
416 chp_cfg_cancel_deconfigure(chpid);
422 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
426 CIO_CRW_EVENT(4, "chsc: scm change notification\n");
427 if (sei_area->rs != 7)
430 ret = scm_update_information();
432 CIO_CRW_EVENT(0, "chsc: updating change notification"
433 " failed (rc=%d).\n", ret);
436 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
440 CIO_CRW_EVENT(4, "chsc: scm available information\n");
441 if (sei_area->rs != 7)
444 ret = scm_process_availability_information();
446 CIO_CRW_EVENT(0, "chsc: process availability information"
447 " failed (rc=%d).\n", ret);
450 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
452 switch (sei_area->cc) {
454 zpci_event_error(sei_area->ccdf);
457 zpci_event_availability(sei_area->ccdf);
460 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
466 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
468 /* which kind of information was stored? */
469 switch (sei_area->cc) {
470 case 1: /* link incident*/
471 chsc_process_sei_link_incident(sei_area);
473 case 2: /* i/o resource accessibility */
474 chsc_process_sei_res_acc(sei_area);
476 case 7: /* channel-path-availability information */
477 chsc_process_sei_chp_avail(sei_area);
479 case 8: /* channel-path-configuration notification */
480 chsc_process_sei_chp_config(sei_area);
482 case 12: /* scm change notification */
483 chsc_process_sei_scm_change(sei_area);
485 case 14: /* scm available notification */
486 chsc_process_sei_scm_avail(sei_area);
488 default: /* other stuff */
489 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
494 /* Check if we might have lost some information. */
495 if (sei_area->flags & 0x40) {
496 CIO_CRW_EVENT(2, "chsc: event overflow\n");
497 css_schedule_eval_all();
501 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
503 static int ntsm_unsupported;
506 memset(sei, 0, sizeof(*sei));
507 sei->request.length = 0x0010;
508 sei->request.code = 0x000e;
509 if (!ntsm_unsupported)
515 if (sei->response.code != 0x0001) {
516 CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
517 sei->response.code, sei->ntsm);
519 if (sei->response.code == 3 && sei->ntsm) {
520 /* Fallback for old firmware. */
521 ntsm_unsupported = 1;
527 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
530 chsc_process_sei_nt0(&sei->u.nt0_area);
533 chsc_process_sei_nt2(&sei->u.nt2_area);
536 CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
540 if (!(sei->u.nt0_area.flags & 0x80))
546 * Handle channel subsystem related CRWs.
547 * Use store event information to find out what's going on.
549 * Note: Access to sei_page is serialized through machine check handler
550 * thread, so no need for locking.
552 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
554 struct chsc_sei *sei = sei_page;
557 css_schedule_eval_all();
560 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
561 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
562 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
563 crw0->erc, crw0->rsid);
565 CIO_TRACE_EVENT(2, "prcss");
566 chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
569 void chsc_chp_online(struct chp_id chpid)
572 struct chp_link link;
574 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
575 CIO_TRACE_EVENT(2, dbf_txt);
577 if (chp_get_status(chpid) != 0) {
578 memset(&link, 0, sizeof(struct chp_link));
580 /* Wait until previous actions have settled. */
581 css_wait_for_slow_path();
582 for_each_subchannel_staged(__s390_process_res_acc, NULL,
587 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
588 struct chp_id chpid, int on)
591 struct chp_link link;
593 memset(&link, 0, sizeof(struct chp_link));
595 spin_lock_irqsave(sch->lock, flags);
596 if (sch->driver && sch->driver->chp_event)
597 sch->driver->chp_event(sch, &link,
598 on ? CHP_VARY_ON : CHP_VARY_OFF);
599 spin_unlock_irqrestore(sch->lock, flags);
602 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
604 struct chp_id *chpid = data;
606 __s390_subchannel_vary_chpid(sch, *chpid, 0);
610 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
612 struct chp_id *chpid = data;
614 __s390_subchannel_vary_chpid(sch, *chpid, 1);
619 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
623 if (stsch_err(schid, &schib))
626 /* Put it on the slow path. */
627 css_schedule_eval(schid);
632 * chsc_chp_vary - propagate channel-path vary operation to subchannels
633 * @chpid: channl-path ID
634 * @on: non-zero for vary online, zero for vary offline
636 int chsc_chp_vary(struct chp_id chpid, int on)
638 struct channel_path *chp = chpid_to_chp(chpid);
640 /* Wait until previous actions have settled. */
641 css_wait_for_slow_path();
643 * Redo PathVerification on the devices the chpid connects to
646 /* Try to update the channel path description. */
647 chp_update_desc(chp);
648 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
649 __s390_vary_chpid_on, &chpid);
651 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
658 chsc_remove_cmg_attr(struct channel_subsystem *css)
662 for (i = 0; i <= __MAX_CHPID; i++) {
665 chp_remove_cmg_attr(css->chps[i]);
670 chsc_add_cmg_attr(struct channel_subsystem *css)
675 for (i = 0; i <= __MAX_CHPID; i++) {
678 ret = chp_add_cmg_attr(css->chps[i]);
684 for (--i; i >= 0; i--) {
687 chp_remove_cmg_attr(css->chps[i]);
692 int __chsc_do_secm(struct channel_subsystem *css, int enable)
695 struct chsc_header request;
696 u32 operation_code : 2;
705 struct chsc_header response;
710 } __attribute__ ((packed)) *secm_area;
713 spin_lock_irq(&chsc_page_lock);
714 memset(chsc_page, 0, PAGE_SIZE);
715 secm_area = chsc_page;
716 secm_area->request.length = 0x0050;
717 secm_area->request.code = 0x0016;
719 secm_area->key = PAGE_DEFAULT_KEY >> 4;
720 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
721 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
723 secm_area->operation_code = enable ? 0 : 1;
725 ccode = chsc(secm_area);
727 ret = (ccode == 3) ? -ENODEV : -EBUSY;
731 switch (secm_area->response.code) {
737 ret = chsc_error_from_response(secm_area->response.code);
740 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
741 secm_area->response.code);
743 spin_unlock_irq(&chsc_page_lock);
748 chsc_secm(struct channel_subsystem *css, int enable)
752 if (enable && !css->cm_enabled) {
753 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
754 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
755 if (!css->cub_addr1 || !css->cub_addr2) {
756 free_page((unsigned long)css->cub_addr1);
757 free_page((unsigned long)css->cub_addr2);
761 ret = __chsc_do_secm(css, enable);
763 css->cm_enabled = enable;
764 if (css->cm_enabled) {
765 ret = chsc_add_cmg_attr(css);
767 __chsc_do_secm(css, 0);
771 chsc_remove_cmg_attr(css);
773 if (!css->cm_enabled) {
774 free_page((unsigned long)css->cub_addr1);
775 free_page((unsigned long)css->cub_addr2);
780 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
781 int c, int m, void *page)
783 struct chsc_scpd *scpd_area;
786 if ((rfmt == 1) && !css_general_characteristics.fcs)
788 if ((rfmt == 2) && !css_general_characteristics.cib)
791 memset(page, 0, PAGE_SIZE);
793 scpd_area->request.length = 0x0010;
794 scpd_area->request.code = 0x0002;
795 scpd_area->cssid = chpid.cssid;
796 scpd_area->first_chpid = chpid.id;
797 scpd_area->last_chpid = chpid.id;
800 scpd_area->fmt = fmt;
801 scpd_area->rfmt = rfmt;
803 ccode = chsc(scpd_area);
805 return (ccode == 3) ? -ENODEV : -EBUSY;
807 ret = chsc_error_from_response(scpd_area->response.code);
809 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
810 scpd_area->response.code);
813 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
815 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
816 struct channel_path_desc *desc)
818 struct chsc_response_struct *chsc_resp;
819 struct chsc_scpd *scpd_area;
823 spin_lock_irqsave(&chsc_page_lock, flags);
824 scpd_area = chsc_page;
825 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
828 chsc_resp = (void *)&scpd_area->response;
829 memcpy(desc, &chsc_resp->data, sizeof(*desc));
831 spin_unlock_irqrestore(&chsc_page_lock, flags);
835 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
836 struct channel_path_desc_fmt1 *desc)
838 struct chsc_response_struct *chsc_resp;
839 struct chsc_scpd *scpd_area;
843 spin_lock_irqsave(&chsc_page_lock, flags);
844 scpd_area = chsc_page;
845 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
848 chsc_resp = (void *)&scpd_area->response;
849 memcpy(desc, &chsc_resp->data, sizeof(*desc));
851 spin_unlock_irqrestore(&chsc_page_lock, flags);
856 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
857 struct cmg_chars *chars)
859 struct cmg_chars *cmg_chars;
862 cmg_chars = chp->cmg_chars;
863 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
864 mask = 0x80 >> (i + 3);
866 cmg_chars->values[i] = chars->values[i];
868 cmg_chars->values[i] = 0;
872 int chsc_get_channel_measurement_chars(struct channel_path *chp)
874 struct cmg_chars *cmg_chars;
878 struct chsc_header request;
884 struct chsc_header response;
895 u32 data[NR_MEASUREMENT_CHARS];
896 } __attribute__ ((packed)) *scmc_area;
898 chp->cmg_chars = NULL;
899 cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
903 spin_lock_irq(&chsc_page_lock);
904 memset(chsc_page, 0, PAGE_SIZE);
905 scmc_area = chsc_page;
906 scmc_area->request.length = 0x0010;
907 scmc_area->request.code = 0x0022;
908 scmc_area->first_chpid = chp->chpid.id;
909 scmc_area->last_chpid = chp->chpid.id;
911 ccode = chsc(scmc_area);
913 ret = (ccode == 3) ? -ENODEV : -EBUSY;
917 ret = chsc_error_from_response(scmc_area->response.code);
919 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
920 scmc_area->response.code);
923 if (scmc_area->not_valid) {
928 chp->cmg = scmc_area->cmg;
929 chp->shared = scmc_area->shared;
930 if (chp->cmg != 2 && chp->cmg != 3) {
931 /* No cmg-dependent data. */
934 chp->cmg_chars = cmg_chars;
935 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
936 (struct cmg_chars *) &scmc_area->data);
938 spin_unlock_irq(&chsc_page_lock);
945 int __init chsc_init(void)
949 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
950 chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
951 if (!sei_page || !chsc_page) {
955 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
960 free_page((unsigned long)chsc_page);
961 free_page((unsigned long)sei_page);
965 void __init chsc_init_cleanup(void)
967 crw_unregister_handler(CRW_RSC_CSS);
968 free_page((unsigned long)chsc_page);
969 free_page((unsigned long)sei_page);
972 int chsc_enable_facility(int operation_code)
977 struct chsc_header request;
984 u32 operation_data_area[252];
985 struct chsc_header response;
989 } __attribute__ ((packed)) *sda_area;
991 spin_lock_irqsave(&chsc_page_lock, flags);
992 memset(chsc_page, 0, PAGE_SIZE);
993 sda_area = chsc_page;
994 sda_area->request.length = 0x0400;
995 sda_area->request.code = 0x0031;
996 sda_area->operation_code = operation_code;
998 ret = chsc(sda_area);
1000 ret = (ret == 3) ? -ENODEV : -EBUSY;
1004 switch (sda_area->response.code) {
1009 ret = chsc_error_from_response(sda_area->response.code);
1012 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1013 operation_code, sda_area->response.code);
1015 spin_unlock_irqrestore(&chsc_page_lock, flags);
1019 struct css_general_char css_general_characteristics;
1020 struct css_chsc_char css_chsc_characteristics;
1023 chsc_determine_css_characteristics(void)
1027 struct chsc_header request;
1031 struct chsc_header response;
1033 u32 general_char[510];
1035 } __attribute__ ((packed)) *scsc_area;
1037 spin_lock_irq(&chsc_page_lock);
1038 memset(chsc_page, 0, PAGE_SIZE);
1039 scsc_area = chsc_page;
1040 scsc_area->request.length = 0x0010;
1041 scsc_area->request.code = 0x0010;
1043 result = chsc(scsc_area);
1045 result = (result == 3) ? -ENODEV : -EBUSY;
1049 result = chsc_error_from_response(scsc_area->response.code);
1051 memcpy(&css_general_characteristics, scsc_area->general_char,
1052 sizeof(css_general_characteristics));
1053 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1054 sizeof(css_chsc_characteristics));
1056 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1057 scsc_area->response.code);
1059 spin_unlock_irq(&chsc_page_lock);
1063 EXPORT_SYMBOL_GPL(css_general_characteristics);
1064 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1066 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
1069 struct chsc_header request;
1071 unsigned int op : 8;
1072 unsigned int rsvd1 : 8;
1073 unsigned int ctrl : 16;
1074 unsigned int rsvd2[5];
1075 struct chsc_header response;
1076 unsigned int rsvd3[7];
1077 } __attribute__ ((packed)) *rr;
1080 memset(page, 0, PAGE_SIZE);
1082 rr->request.length = 0x0020;
1083 rr->request.code = 0x0033;
1089 rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1093 int chsc_sstpi(void *page, void *result, size_t size)
1096 struct chsc_header request;
1097 unsigned int rsvd0[3];
1098 struct chsc_header response;
1100 } __attribute__ ((packed)) *rr;
1103 memset(page, 0, PAGE_SIZE);
1105 rr->request.length = 0x0010;
1106 rr->request.code = 0x0038;
1110 memcpy(result, &rr->data, size);
1111 return (rr->response.code == 0x0001) ? 0 : -EIO;
1114 int chsc_siosl(struct subchannel_id schid)
1117 struct chsc_header request;
1119 struct subchannel_id sid;
1121 struct chsc_header response;
1123 } __attribute__ ((packed)) *siosl_area;
1124 unsigned long flags;
1128 spin_lock_irqsave(&chsc_page_lock, flags);
1129 memset(chsc_page, 0, PAGE_SIZE);
1130 siosl_area = chsc_page;
1131 siosl_area->request.length = 0x0010;
1132 siosl_area->request.code = 0x0046;
1133 siosl_area->word1 = 0x80000000;
1134 siosl_area->sid = schid;
1136 ccode = chsc(siosl_area);
1142 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1143 schid.ssid, schid.sch_no, ccode);
1146 rc = chsc_error_from_response(siosl_area->response.code);
1148 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1149 schid.ssid, schid.sch_no,
1150 siosl_area->response.code);
1152 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1153 schid.ssid, schid.sch_no);
1155 spin_unlock_irqrestore(&chsc_page_lock, flags);
1158 EXPORT_SYMBOL_GPL(chsc_siosl);
1161 * chsc_scm_info() - store SCM information (SSI)
1162 * @scm_area: request and response block for SSI
1163 * @token: continuation token
1165 * Returns 0 on success.
1167 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1171 memset(scm_area, 0, sizeof(*scm_area));
1172 scm_area->request.length = 0x0020;
1173 scm_area->request.code = 0x004C;
1174 scm_area->reqtok = token;
1176 ccode = chsc(scm_area);
1178 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1181 ret = chsc_error_from_response(scm_area->response.code);
1183 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1184 scm_area->response.code);
1188 EXPORT_SYMBOL_GPL(chsc_scm_info);