2 * drivers/s390/cio/chsc.c
3 * S/390 common I/O routines -- channel subsystem call
5 * Copyright IBM Corp. 1999,2008
6 * Author(s): Ingo Adlung (adlung@de.ibm.com)
7 * Cornelia Huck (cornelia.huck@de.ibm.com)
8 * Arnd Bergmann (arndb@de.ibm.com)
11 #define KMSG_COMPONENT "cio"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/init.h>
17 #include <linux/device.h>
20 #include <asm/chpid.h>
26 #include "cio_debug.h"
31 static void *sei_page;
32 static DEFINE_SPINLOCK(sda_lock);
35 * chsc_error_from_response() - convert a chsc response to an error
36 * @response: chsc response code
38 * Returns an appropriate Linux error code for @response.
40 int chsc_error_from_response(int response)
58 EXPORT_SYMBOL_GPL(chsc_error_from_response);
60 struct chsc_ssd_area {
61 struct chsc_header request;
65 u16 f_sch; /* first subchannel */
67 u16 l_sch; /* last subchannel */
69 struct chsc_header response;
73 u8 st : 3; /* subchannel type */
75 u8 unit_addr; /* unit address */
76 u16 devno; /* device number */
79 u16 sch; /* subchannel */
80 u8 chpid[8]; /* chpids 0-7 */
81 u16 fla[8]; /* full link addresses 0-7 */
82 } __attribute__ ((packed));
84 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
87 struct chsc_ssd_area *ssd_area;
93 page = get_zeroed_page(GFP_KERNEL | GFP_DMA);
96 ssd_area = (struct chsc_ssd_area *) page;
97 ssd_area->request.length = 0x0010;
98 ssd_area->request.code = 0x0004;
99 ssd_area->ssid = schid.ssid;
100 ssd_area->f_sch = schid.sch_no;
101 ssd_area->l_sch = schid.sch_no;
103 ccode = chsc(ssd_area);
104 /* Check response. */
106 ret = (ccode == 3) ? -ENODEV : -EBUSY;
109 ret = chsc_error_from_response(ssd_area->response.code);
111 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
112 schid.ssid, schid.sch_no,
113 ssd_area->response.code);
116 if (!ssd_area->sch_valid) {
122 memset(ssd, 0, sizeof(struct chsc_ssd_info));
123 if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
124 (ssd_area->st != SUBCHANNEL_TYPE_MSG))
126 ssd->path_mask = ssd_area->path_mask;
127 ssd->fla_valid_mask = ssd_area->fla_valid_mask;
128 for (i = 0; i < 8; i++) {
130 if (ssd_area->path_mask & mask) {
131 chp_id_init(&ssd->chpid[i]);
132 ssd->chpid[i].id = ssd_area->chpid[i];
134 if (ssd_area->fla_valid_mask & mask)
135 ssd->fla[i] = ssd_area->fla[i];
142 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
144 spin_lock_irq(sch->lock);
145 if (sch->driver && sch->driver->chp_event)
146 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
148 spin_unlock_irq(sch->lock);
153 spin_unlock_irq(sch->lock);
154 css_schedule_eval(sch->schid);
158 void chsc_chp_offline(struct chp_id chpid)
161 struct chp_link link;
163 sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
164 CIO_TRACE_EVENT(2, dbf_txt);
166 if (chp_get_status(chpid) <= 0)
168 memset(&link, 0, sizeof(struct chp_link));
170 /* Wait until previous actions have settled. */
171 css_wait_for_slow_path();
172 for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
175 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
179 * We don't know the device yet, but since a path
180 * may be available now to the device we'll have
181 * to do recognition again.
182 * Since we don't have any idea about which chpid
183 * that beast may be on we'll have to do a stsch
184 * on all devices, grr...
186 if (stsch_err(schid, &schib))
190 /* Put it on the slow path. */
191 css_schedule_eval(schid);
195 static int __s390_process_res_acc(struct subchannel *sch, void *data)
197 spin_lock_irq(sch->lock);
198 if (sch->driver && sch->driver->chp_event)
199 sch->driver->chp_event(sch, data, CHP_ONLINE);
200 spin_unlock_irq(sch->lock);
205 static void s390_process_res_acc(struct chp_link *link)
209 sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
211 CIO_TRACE_EVENT( 2, dbf_txt);
212 if (link->fla != 0) {
213 sprintf(dbf_txt, "fla%x", link->fla);
214 CIO_TRACE_EVENT( 2, dbf_txt);
216 /* Wait until previous actions have settled. */
217 css_wait_for_slow_path();
219 * I/O resources may have become accessible.
220 * Scan through all subchannels that may be concerned and
221 * do a validation on those.
222 * The more information we have (info), the less scanning
223 * will we have to do.
225 for_each_subchannel_staged(__s390_process_res_acc,
226 s390_process_res_acc_new_sch, link);
230 __get_chpid_from_lir(void *data)
236 /* incident-node descriptor */
238 /* attached-node descriptor */
240 /* incident-specific information */
242 } __attribute__ ((packed)) *lir;
246 /* NULL link incident record */
248 if (!(lir->indesc[0]&0xc0000000))
249 /* node descriptor not valid */
251 if (!(lir->indesc[0]&0x10000000))
252 /* don't handle device-type nodes - FIXME */
254 /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
256 return (u16) (lir->indesc[0]&0x000000ff);
259 struct chsc_sei_area {
260 struct chsc_header request;
264 struct chsc_header response;
267 u8 vf; /* validity flags */
268 u8 rs; /* reporting source */
269 u8 cc; /* content code */
270 u16 fla; /* full link address */
271 u16 rsid; /* reporting source id */
274 u8 ccdf[4096 - 16 - 24]; /* content-code dependent field */
275 /* ccdf has to be big enough for a link-incident record */
276 } __attribute__ ((packed));
278 static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
283 CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
284 sei_area->rs, sei_area->rsid);
285 if (sei_area->rs != 4)
287 id = __get_chpid_from_lir(sei_area->ccdf);
289 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
293 chsc_chp_offline(chpid);
297 static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
299 struct chp_link link;
303 CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
304 "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
305 if (sei_area->rs != 4)
308 chpid.id = sei_area->rsid;
309 /* allocate a new channel path structure, if needed */
310 status = chp_get_status(chpid);
315 memset(&link, 0, sizeof(struct chp_link));
317 if ((sei_area->vf & 0xc0) != 0) {
318 link.fla = sei_area->fla;
319 if ((sei_area->vf & 0xc0) == 0xc0)
320 /* full link address */
321 link.fla_mask = 0xffff;
324 link.fla_mask = 0xff00;
326 s390_process_res_acc(&link);
329 struct chp_config_data {
335 static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
337 struct chp_config_data *data;
340 char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
342 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
343 if (sei_area->rs != 0)
345 data = (struct chp_config_data *) &(sei_area->ccdf);
347 for (num = 0; num <= __MAX_CHPID; num++) {
348 if (!chp_test_bit(data->map, num))
351 pr_notice("Processing %s for channel path %x.%02x\n",
352 events[data->op], chpid.cssid, chpid.id);
355 chp_cfg_schedule(chpid, 1);
358 chp_cfg_schedule(chpid, 0);
361 chp_cfg_cancel_deconfigure(chpid);
367 static void chsc_process_sei(struct chsc_sei_area *sei_area)
369 /* Check if we might have lost some information. */
370 if (sei_area->flags & 0x40) {
371 CIO_CRW_EVENT(2, "chsc: event overflow\n");
372 css_schedule_eval_all();
374 /* which kind of information was stored? */
375 switch (sei_area->cc) {
376 case 1: /* link incident*/
377 chsc_process_sei_link_incident(sei_area);
379 case 2: /* i/o resource accessibiliy */
380 chsc_process_sei_res_acc(sei_area);
382 case 8: /* channel-path-configuration notification */
383 chsc_process_sei_chp_config(sei_area);
385 default: /* other stuff */
386 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
392 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
394 struct chsc_sei_area *sei_area;
397 css_schedule_eval_all();
400 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
401 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
402 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
403 crw0->erc, crw0->rsid);
406 /* Access to sei_page is serialized through machine check handler
407 * thread, so no need for locking. */
410 CIO_TRACE_EVENT(2, "prcss");
412 memset(sei_area, 0, sizeof(*sei_area));
413 sei_area->request.length = 0x0010;
414 sei_area->request.code = 0x000e;
418 if (sei_area->response.code == 0x0001) {
419 CIO_CRW_EVENT(4, "chsc: sei successful\n");
420 chsc_process_sei(sei_area);
422 CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
423 sei_area->response.code);
426 } while (sei_area->flags & 0x80);
429 void chsc_chp_online(struct chp_id chpid)
432 struct chp_link link;
434 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
435 CIO_TRACE_EVENT(2, dbf_txt);
437 if (chp_get_status(chpid) != 0) {
438 memset(&link, 0, sizeof(struct chp_link));
440 /* Wait until previous actions have settled. */
441 css_wait_for_slow_path();
442 for_each_subchannel_staged(__s390_process_res_acc, NULL,
447 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
448 struct chp_id chpid, int on)
451 struct chp_link link;
453 memset(&link, 0, sizeof(struct chp_link));
455 spin_lock_irqsave(sch->lock, flags);
456 if (sch->driver && sch->driver->chp_event)
457 sch->driver->chp_event(sch, &link,
458 on ? CHP_VARY_ON : CHP_VARY_OFF);
459 spin_unlock_irqrestore(sch->lock, flags);
462 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
464 struct chp_id *chpid = data;
466 __s390_subchannel_vary_chpid(sch, *chpid, 0);
470 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
472 struct chp_id *chpid = data;
474 __s390_subchannel_vary_chpid(sch, *chpid, 1);
479 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
483 if (stsch_err(schid, &schib))
486 /* Put it on the slow path. */
487 css_schedule_eval(schid);
492 * chsc_chp_vary - propagate channel-path vary operation to subchannels
493 * @chpid: channl-path ID
494 * @on: non-zero for vary online, zero for vary offline
496 int chsc_chp_vary(struct chp_id chpid, int on)
498 struct chp_link link;
500 memset(&link, 0, sizeof(struct chp_link));
502 /* Wait until previous actions have settled. */
503 css_wait_for_slow_path();
505 * Redo PathVerification on the devices the chpid connects to
509 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
510 __s390_vary_chpid_on, &link);
512 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
519 chsc_remove_cmg_attr(struct channel_subsystem *css)
523 for (i = 0; i <= __MAX_CHPID; i++) {
526 chp_remove_cmg_attr(css->chps[i]);
531 chsc_add_cmg_attr(struct channel_subsystem *css)
536 for (i = 0; i <= __MAX_CHPID; i++) {
539 ret = chp_add_cmg_attr(css->chps[i]);
545 for (--i; i >= 0; i--) {
548 chp_remove_cmg_attr(css->chps[i]);
553 int __chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
556 struct chsc_header request;
557 u32 operation_code : 2;
566 struct chsc_header response;
571 } __attribute__ ((packed)) *secm_area;
575 secm_area->request.length = 0x0050;
576 secm_area->request.code = 0x0016;
578 secm_area->key = PAGE_DEFAULT_KEY >> 4;
579 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
580 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
582 secm_area->operation_code = enable ? 0 : 1;
584 ccode = chsc(secm_area);
586 return (ccode == 3) ? -ENODEV : -EBUSY;
588 switch (secm_area->response.code) {
594 ret = chsc_error_from_response(secm_area->response.code);
597 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
598 secm_area->response.code);
603 chsc_secm(struct channel_subsystem *css, int enable)
608 secm_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
612 if (enable && !css->cm_enabled) {
613 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
614 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
615 if (!css->cub_addr1 || !css->cub_addr2) {
616 free_page((unsigned long)css->cub_addr1);
617 free_page((unsigned long)css->cub_addr2);
618 free_page((unsigned long)secm_area);
622 ret = __chsc_do_secm(css, enable, secm_area);
624 css->cm_enabled = enable;
625 if (css->cm_enabled) {
626 ret = chsc_add_cmg_attr(css);
628 memset(secm_area, 0, PAGE_SIZE);
629 __chsc_do_secm(css, 0, secm_area);
633 chsc_remove_cmg_attr(css);
635 if (!css->cm_enabled) {
636 free_page((unsigned long)css->cub_addr1);
637 free_page((unsigned long)css->cub_addr2);
639 free_page((unsigned long)secm_area);
643 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
645 struct chsc_response_struct *resp)
650 struct chsc_header request;
662 struct chsc_header response;
663 u8 data[PAGE_SIZE - 20];
664 } __attribute__ ((packed)) *scpd_area;
666 if ((rfmt == 1) && !css_general_characteristics.fcs)
668 if ((rfmt == 2) && !css_general_characteristics.cib)
670 scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
674 scpd_area->request.length = 0x0010;
675 scpd_area->request.code = 0x0002;
677 scpd_area->cssid = chpid.cssid;
678 scpd_area->first_chpid = chpid.id;
679 scpd_area->last_chpid = chpid.id;
682 scpd_area->fmt = fmt;
683 scpd_area->rfmt = rfmt;
685 ccode = chsc(scpd_area);
687 ret = (ccode == 3) ? -ENODEV : -EBUSY;
691 ret = chsc_error_from_response(scpd_area->response.code);
694 memcpy(resp, &scpd_area->response, scpd_area->response.length);
696 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
697 scpd_area->response.code);
699 free_page((unsigned long)scpd_area);
702 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
704 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
705 struct channel_path_desc *desc)
707 struct chsc_response_struct *chsc_resp;
710 chsc_resp = kzalloc(sizeof(*chsc_resp), GFP_KERNEL);
713 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, chsc_resp);
716 memcpy(desc, &chsc_resp->data, sizeof(*desc));
723 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
724 struct cmg_chars *chars)
729 chp->cmg_chars = kmalloc(sizeof(struct cmg_chars),
731 if (chp->cmg_chars) {
733 struct cmg_chars *cmg_chars;
735 cmg_chars = chp->cmg_chars;
736 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
737 mask = 0x80 >> (i + 3);
739 cmg_chars->values[i] = chars->values[i];
741 cmg_chars->values[i] = 0;
746 /* No cmg-dependent data. */
751 int chsc_get_channel_measurement_chars(struct channel_path *chp)
756 struct chsc_header request;
762 struct chsc_header response;
773 u32 data[NR_MEASUREMENT_CHARS];
774 } __attribute__ ((packed)) *scmc_area;
776 scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
780 scmc_area->request.length = 0x0010;
781 scmc_area->request.code = 0x0022;
783 scmc_area->first_chpid = chp->chpid.id;
784 scmc_area->last_chpid = chp->chpid.id;
786 ccode = chsc(scmc_area);
788 ret = (ccode == 3) ? -ENODEV : -EBUSY;
792 ret = chsc_error_from_response(scmc_area->response.code);
795 if (!scmc_area->not_valid) {
796 chp->cmg = scmc_area->cmg;
797 chp->shared = scmc_area->shared;
798 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
806 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
807 scmc_area->response.code);
810 free_page((unsigned long)scmc_area);
814 int __init chsc_alloc_sei_area(void)
818 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
820 CIO_MSG_EVENT(0, "Can't allocate page for processing of "
821 "chsc machine checks!\n");
824 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
830 void __init chsc_free_sei_area(void)
832 crw_unregister_handler(CRW_RSC_CSS);
836 int chsc_enable_facility(int operation_code)
840 struct chsc_header request;
847 u32 operation_data_area[252];
848 struct chsc_header response;
852 } __attribute__ ((packed, aligned(4096))) sda_area;
854 spin_lock(&sda_lock);
855 memset(&sda_area, 0, sizeof(sda_area));
856 sda_area.request.length = 0x0400;
857 sda_area.request.code = 0x0031;
858 sda_area.operation_code = operation_code;
860 ret = chsc(&sda_area);
862 ret = (ret == 3) ? -ENODEV : -EBUSY;
866 switch (sda_area.response.code) {
871 ret = chsc_error_from_response(sda_area.response.code);
874 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
875 operation_code, sda_area.response.code);
877 spin_unlock(&sda_lock);
881 struct css_general_char css_general_characteristics;
882 struct css_chsc_char css_chsc_characteristics;
885 chsc_determine_css_characteristics(void)
889 struct chsc_header request;
893 struct chsc_header response;
895 u32 general_char[510];
897 } __attribute__ ((packed)) *scsc_area;
899 scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
903 scsc_area->request.length = 0x0010;
904 scsc_area->request.code = 0x0010;
906 result = chsc(scsc_area);
908 result = (result == 3) ? -ENODEV : -EBUSY;
912 result = chsc_error_from_response(scsc_area->response.code);
914 memcpy(&css_general_characteristics, scsc_area->general_char,
915 sizeof(css_general_characteristics));
916 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
917 sizeof(css_chsc_characteristics));
919 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
920 scsc_area->response.code);
922 free_page ((unsigned long) scsc_area);
926 EXPORT_SYMBOL_GPL(css_general_characteristics);
927 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
929 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
932 struct chsc_header request;
935 unsigned int rsvd1 : 8;
936 unsigned int ctrl : 16;
937 unsigned int rsvd2[5];
938 struct chsc_header response;
939 unsigned int rsvd3[7];
940 } __attribute__ ((packed)) *rr;
943 memset(page, 0, PAGE_SIZE);
945 rr->request.length = 0x0020;
946 rr->request.code = 0x0033;
952 rc = (rr->response.code == 0x0001) ? 0 : -EIO;
956 int chsc_sstpi(void *page, void *result, size_t size)
959 struct chsc_header request;
960 unsigned int rsvd0[3];
961 struct chsc_header response;
963 } __attribute__ ((packed)) *rr;
966 memset(page, 0, PAGE_SIZE);
968 rr->request.length = 0x0010;
969 rr->request.code = 0x0038;
973 memcpy(result, &rr->data, size);
974 return (rr->response.code == 0x0001) ? 0 : -EIO;