2 * S/390 common I/O routines -- low level i/o calls
4 * Copyright IBM Corp. 1999, 2008
5 * Author(s): Ingo Adlung (adlung@de.ibm.com)
6 * Cornelia Huck (cornelia.huck@de.ibm.com)
7 * Arnd Bergmann (arndb@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
11 #define KMSG_COMPONENT "cio"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/ftrace.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/device.h>
19 #include <linux/kernel_stat.h>
20 #include <linux/interrupt.h>
21 #include <linux/irq.h>
23 #include <asm/delay.h>
25 #include <asm/irq_regs.h>
26 #include <asm/setup.h>
27 #include <asm/reset.h>
29 #include <asm/chpid.h>
32 #include <linux/cputime.h>
41 #include "blacklist.h"
42 #include "cio_debug.h"
45 debug_info_t *cio_debug_msg_id;
46 debug_info_t *cio_debug_trace_id;
47 debug_info_t *cio_debug_crw_id;
50 * Function: cio_debug_init
51 * Initializes three debug logs for common I/O:
52 * - cio_msg logs generic cio messages
53 * - cio_trace logs the calling of different functions
54 * - cio_crw logs machine check related cio messages
56 static int __init cio_debug_init(void)
58 cio_debug_msg_id = debug_register("cio_msg", 16, 1, 11 * sizeof(long));
59 if (!cio_debug_msg_id)
61 debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
62 debug_set_level(cio_debug_msg_id, 2);
63 cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16);
64 if (!cio_debug_trace_id)
66 debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
67 debug_set_level(cio_debug_trace_id, 2);
68 cio_debug_crw_id = debug_register("cio_crw", 8, 1, 8 * sizeof(long));
69 if (!cio_debug_crw_id)
71 debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
72 debug_set_level(cio_debug_crw_id, 4);
77 debug_unregister(cio_debug_msg_id);
78 if (cio_debug_trace_id)
79 debug_unregister(cio_debug_trace_id);
81 debug_unregister(cio_debug_crw_id);
85 arch_initcall (cio_debug_init);
87 int cio_set_options(struct subchannel *sch, int flags)
89 struct io_subchannel_private *priv = to_io_private(sch);
91 priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0;
92 priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0;
93 priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0;
98 cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
107 CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
108 "subchannel 0.%x.%04x!\n", sch->schid.ssid,
111 if (cio_update_schib(sch))
114 sprintf(dbf_text, "no%s", dev_name(&sch->dev));
115 CIO_TRACE_EVENT(0, dbf_text);
116 CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
118 return (sch->lpm ? -EACCES : -ENODEV);
122 cio_start_key (struct subchannel *sch, /* subchannel structure */
123 struct ccw1 * cpa, /* logical channel prog addr */
124 __u8 lpm, /* logical path mask */
125 __u8 key) /* storage key */
127 struct io_subchannel_private *priv = to_io_private(sch);
128 union orb *orb = &priv->orb;
131 CIO_TRACE_EVENT(5, "stIO");
132 CIO_TRACE_EVENT(5, dev_name(&sch->dev));
134 memset(orb, 0, sizeof(union orb));
135 /* sch is always under 2G. */
136 orb->cmd.intparm = (u32)(addr_t)sch;
139 orb->cmd.pfch = priv->options.prefetch == 0;
140 orb->cmd.spnd = priv->options.suspend;
141 orb->cmd.ssic = priv->options.suspend && priv->options.inter;
142 orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;
145 * for 64 bit we always support 64 bit IDAWs with 4k page size only
150 orb->cmd.key = key >> 4;
151 /* issue "Start Subchannel" */
152 orb->cmd.cpa = (__u32) __pa(cpa);
153 ccode = ssch(sch->schid, orb);
155 /* process condition code */
156 CIO_HEX_EVENT(5, &ccode, sizeof(ccode));
161 * initialize device status information
163 sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
165 case 1: /* status pending */
168 case 3: /* device/path not operational */
169 return cio_start_handle_notoper(sch, lpm);
176 cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
178 return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
182 * resume suspended I/O operation
185 cio_resume (struct subchannel *sch)
189 CIO_TRACE_EVENT(4, "resIO");
190 CIO_TRACE_EVENT(4, dev_name(&sch->dev));
192 ccode = rsch (sch->schid);
194 CIO_HEX_EVENT(4, &ccode, sizeof(ccode));
198 sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;
206 * useless to wait for request completion
207 * as device is no longer operational !
217 cio_halt(struct subchannel *sch)
224 CIO_TRACE_EVENT(2, "haltIO");
225 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
228 * Issue "Halt subchannel" and process condition code
230 ccode = hsch (sch->schid);
232 CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
236 sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
238 case 1: /* status pending */
241 default: /* device not operational */
247 * Clear I/O operation
250 cio_clear(struct subchannel *sch)
257 CIO_TRACE_EVENT(2, "clearIO");
258 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
261 * Issue "Clear subchannel" and process condition code
263 ccode = csch (sch->schid);
265 CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
269 sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;
271 default: /* device not operational */
277 * Function: cio_cancel
278 * Issues a "Cancel Subchannel" on the specified subchannel
279 * Note: We don't need any fancy intparms and flags here
280 * since xsch is executed synchronously.
281 * Only for common I/O internal use as for now.
284 cio_cancel (struct subchannel *sch)
291 CIO_TRACE_EVENT(2, "cancelIO");
292 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
294 ccode = xsch (sch->schid);
296 CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
299 case 0: /* success */
300 /* Update information in scsw. */
301 if (cio_update_schib(sch))
304 case 1: /* status pending */
306 case 2: /* not applicable */
308 default: /* not oper */
314 static void cio_apply_config(struct subchannel *sch, struct schib *schib)
316 schib->pmcw.intparm = sch->config.intparm;
317 schib->pmcw.mbi = sch->config.mbi;
318 schib->pmcw.isc = sch->config.isc;
319 schib->pmcw.ena = sch->config.ena;
320 schib->pmcw.mme = sch->config.mme;
321 schib->pmcw.mp = sch->config.mp;
322 schib->pmcw.csense = sch->config.csense;
323 schib->pmcw.mbfc = sch->config.mbfc;
324 if (sch->config.mbfc)
325 schib->mba = sch->config.mba;
328 static int cio_check_config(struct subchannel *sch, struct schib *schib)
330 return (schib->pmcw.intparm == sch->config.intparm) &&
331 (schib->pmcw.mbi == sch->config.mbi) &&
332 (schib->pmcw.isc == sch->config.isc) &&
333 (schib->pmcw.ena == sch->config.ena) &&
334 (schib->pmcw.mme == sch->config.mme) &&
335 (schib->pmcw.mp == sch->config.mp) &&
336 (schib->pmcw.csense == sch->config.csense) &&
337 (schib->pmcw.mbfc == sch->config.mbfc) &&
338 (!sch->config.mbfc || (schib->mba == sch->config.mba));
342 * cio_commit_config - apply configuration to the subchannel
344 int cio_commit_config(struct subchannel *sch)
346 int ccode, retry, ret = 0;
350 if (stsch_err(sch->schid, &schib) || !css_sch_is_valid(&schib))
353 for (retry = 0; retry < 5; retry++) {
354 /* copy desired changes to local schib */
355 cio_apply_config(sch, &schib);
356 ccode = msch_err(sch->schid, &schib);
357 if (ccode < 0) /* -EIO if msch gets a program check. */
360 case 0: /* successful */
361 if (stsch_err(sch->schid, &schib) ||
362 !css_sch_is_valid(&schib))
364 if (cio_check_config(sch, &schib)) {
365 /* commit changes from local schib */
366 memcpy(&sch->schib, &schib, sizeof(schib));
371 case 1: /* status pending */
373 if (tsch(sch->schid, &irb))
377 udelay(100); /* allow for recovery */
380 case 3: /* not operational */
388 * cio_update_schib - Perform stsch and update schib if subchannel is valid.
389 * @sch: subchannel on which to perform stsch
390 * Return zero on success, -ENODEV otherwise.
392 int cio_update_schib(struct subchannel *sch)
396 if (stsch_err(sch->schid, &schib) || !css_sch_is_valid(&schib))
399 memcpy(&sch->schib, &schib, sizeof(schib));
402 EXPORT_SYMBOL_GPL(cio_update_schib);
405 * cio_enable_subchannel - enable a subchannel.
406 * @sch: subchannel to be enabled
407 * @intparm: interruption parameter to set
409 int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
413 CIO_TRACE_EVENT(2, "ensch");
414 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
416 if (sch_is_pseudo_sch(sch))
418 if (cio_update_schib(sch))
422 sch->config.isc = sch->isc;
423 sch->config.intparm = intparm;
425 ret = cio_commit_config(sch);
428 * Got a program check in msch. Try without
429 * the concurrent sense bit the next time.
431 sch->config.csense = 0;
432 ret = cio_commit_config(sch);
434 CIO_HEX_EVENT(2, &ret, sizeof(ret));
437 EXPORT_SYMBOL_GPL(cio_enable_subchannel);
440 * cio_disable_subchannel - disable a subchannel.
441 * @sch: subchannel to disable
443 int cio_disable_subchannel(struct subchannel *sch)
447 CIO_TRACE_EVENT(2, "dissch");
448 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
450 if (sch_is_pseudo_sch(sch))
452 if (cio_update_schib(sch))
456 ret = cio_commit_config(sch);
458 CIO_HEX_EVENT(2, &ret, sizeof(ret));
461 EXPORT_SYMBOL_GPL(cio_disable_subchannel);
463 static int cio_check_devno_blacklisted(struct subchannel *sch)
465 if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) {
467 * This device must not be known to Linux. So we simply
468 * say that there is no device and return ENODEV.
470 CIO_MSG_EVENT(6, "Blacklisted device detected "
471 "at devno %04X, subchannel set %x\n",
472 sch->schib.pmcw.dev, sch->schid.ssid);
478 static int cio_validate_io_subchannel(struct subchannel *sch)
480 /* Initialization for io subchannels. */
481 if (!css_sch_is_valid(&sch->schib))
484 /* Devno is valid. */
485 return cio_check_devno_blacklisted(sch);
488 static int cio_validate_msg_subchannel(struct subchannel *sch)
490 /* Initialization for message subchannels. */
491 if (!css_sch_is_valid(&sch->schib))
494 /* Devno is valid. */
495 return cio_check_devno_blacklisted(sch);
499 * cio_validate_subchannel - basic validation of subchannel
500 * @sch: subchannel structure to be filled out
501 * @schid: subchannel id
503 * Find out subchannel type and initialize struct subchannel.
506 * -ENXIO for non-defined subchannels
507 * -ENODEV for invalid subchannels or blacklisted devices
508 * -EIO for subchannels in an invalid subchannel set
510 int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid)
516 sprintf(dbf_txt, "valsch%x", schid.sch_no);
517 CIO_TRACE_EVENT(4, dbf_txt);
520 * The first subchannel that is not-operational (ccode==3)
521 * indicates that there aren't any more devices available.
522 * If stsch gets an exception, it means the current subchannel set
525 ccode = stsch_err(schid, &sch->schib);
527 err = (ccode == 3) ? -ENXIO : ccode;
530 sch->st = sch->schib.pmcw.st;
534 case SUBCHANNEL_TYPE_IO:
535 err = cio_validate_io_subchannel(sch);
537 case SUBCHANNEL_TYPE_MSG:
538 err = cio_validate_msg_subchannel(sch);
546 CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
547 sch->schid.ssid, sch->schid.sch_no, sch->st);
553 * do_cio_interrupt() handles all normal I/O device IRQ's
555 static irqreturn_t do_cio_interrupt(int irq, void *dummy)
557 struct tpi_info *tpi_info;
558 struct subchannel *sch;
561 __this_cpu_write(s390_idle.nohz_delay, 1);
562 tpi_info = (struct tpi_info *) &get_irq_regs()->int_code;
563 irb = (struct irb *) &S390_lowcore.irb;
564 sch = (struct subchannel *)(unsigned long) tpi_info->intparm;
566 /* Clear pending interrupt condition. */
567 inc_irq_stat(IRQIO_CIO);
568 tsch(tpi_info->schid, irb);
571 spin_lock(sch->lock);
572 /* Store interrupt response block to lowcore. */
573 if (tsch(tpi_info->schid, irb) == 0) {
574 /* Keep subchannel information word up to date. */
575 memcpy (&sch->schib.scsw, &irb->scsw, sizeof (irb->scsw));
576 /* Call interrupt handler if there is one. */
577 if (sch->driver && sch->driver->irq)
578 sch->driver->irq(sch);
580 inc_irq_stat(IRQIO_CIO);
582 inc_irq_stat(IRQIO_CIO);
583 spin_unlock(sch->lock);
588 static struct irqaction io_interrupt = {
590 .handler = do_cio_interrupt,
593 void __init init_cio_interrupts(void)
595 irq_set_chip_and_handler(IO_INTERRUPT,
596 &dummy_irq_chip, handle_percpu_irq);
597 setup_irq(IO_INTERRUPT, &io_interrupt);
600 #ifdef CONFIG_CCW_CONSOLE
601 static struct subchannel *console_sch;
604 * Use cio_tsch to update the subchannel status and call the interrupt handler
605 * if status had been pending. Called with the subchannel's lock held.
607 void cio_tsch(struct subchannel *sch)
612 irb = (struct irb *)&S390_lowcore.irb;
613 /* Store interrupt response block to lowcore. */
614 if (tsch(sch->schid, irb) != 0)
615 /* Not status pending or not operational. */
617 memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw));
618 /* Call interrupt handler with updated status. */
619 irq_context = in_interrupt();
624 kstat_incr_irq_this_cpu(IO_INTERRUPT);
625 if (sch->driver && sch->driver->irq)
626 sch->driver->irq(sch);
628 inc_irq_stat(IRQIO_CIO);
635 static int cio_test_for_console(struct subchannel_id schid, void *data)
639 if (stsch_err(schid, &schib) != 0)
641 if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
642 (schib.pmcw.dev == console_devno)) {
643 console_irq = schid.sch_no;
644 return 1; /* found */
649 static int cio_get_console_sch_no(void)
651 struct subchannel_id schid;
654 init_subchannel_id(&schid);
655 if (console_irq != -1) {
656 /* VM provided us with the irq number of the console. */
657 schid.sch_no = console_irq;
658 if (stsch_err(schid, &schib) != 0 ||
659 (schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv)
661 console_devno = schib.pmcw.dev;
662 } else if (console_devno != -1) {
663 /* At least the console device number is known. */
664 for_each_subchannel(cio_test_for_console, NULL);
669 struct subchannel *cio_probe_console(void)
671 struct subchannel_id schid;
672 struct subchannel *sch;
675 sch_no = cio_get_console_sch_no();
677 pr_warning("No CCW console was found\n");
678 return ERR_PTR(-ENODEV);
680 init_subchannel_id(&schid);
681 schid.sch_no = sch_no;
682 sch = css_alloc_subchannel(schid);
686 isc_register(CONSOLE_ISC);
687 sch->config.isc = CONSOLE_ISC;
688 sch->config.intparm = (u32)(addr_t)sch;
689 ret = cio_commit_config(sch);
691 isc_unregister(CONSOLE_ISC);
692 put_device(&sch->dev);
699 int cio_is_console(struct subchannel_id schid)
703 return schid_equal(&schid, &console_sch->schid);
706 void cio_register_early_subchannels(void)
713 ret = css_register_subchannel(console_sch);
715 put_device(&console_sch->dev);
717 #endif /* CONFIG_CCW_CONSOLE */
720 __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
725 for (retry=0;retry<3;retry++) {
727 cc = msch_err(schid, schib);
729 return (cc==3?-ENODEV:-EBUSY);
730 if (stsch_err(schid, schib) || !css_sch_is_valid(schib))
732 if (!schib->pmcw.ena)
735 return -EBUSY; /* uhm... */
739 __clear_io_subchannel_easy(struct subchannel_id schid)
745 for (retry=0;retry<20;retry++) {
749 tsch(ti.schid, (struct irb *)&S390_lowcore.irb);
750 if (schid_equal(&ti.schid, &schid))
758 static void __clear_chsc_subchannel_easy(void)
760 /* It seems we can only wait for a bit here :/ */
764 static int pgm_check_occured;
766 static void cio_reset_pgm_check_handler(void)
768 pgm_check_occured = 1;
771 static int stsch_reset(struct subchannel_id schid, struct schib *addr)
775 pgm_check_occured = 0;
776 s390_base_pgm_handler_fn = cio_reset_pgm_check_handler;
777 rc = stsch_err(schid, addr);
778 s390_base_pgm_handler_fn = NULL;
780 /* The program check handler could have changed pgm_check_occured. */
783 if (pgm_check_occured)
789 static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
793 if (stsch_reset(schid, &schib))
797 switch(__disable_subchannel_easy(schid, &schib)) {
801 default: /* -EBUSY */
802 switch (schib.pmcw.st) {
803 case SUBCHANNEL_TYPE_IO:
804 if (__clear_io_subchannel_easy(schid))
805 goto out; /* give up... */
807 case SUBCHANNEL_TYPE_CHSC:
808 __clear_chsc_subchannel_easy();
811 /* No default clear strategy */
814 stsch_err(schid, &schib);
815 __disable_subchannel_easy(schid, &schib);
821 static atomic_t chpid_reset_count;
823 static void s390_reset_chpids_mcck_handler(void)
828 /* Check for pending channel report word. */
829 mci = (struct mci *)&S390_lowcore.mcck_interruption_code;
832 /* Process channel report words. */
833 while (stcrw(&crw) == 0) {
834 /* Check for responses to RCHP. */
835 if (crw.slct && crw.rsc == CRW_RSC_CPATH)
836 atomic_dec(&chpid_reset_count);
840 #define RCHP_TIMEOUT (30 * USEC_PER_SEC)
841 static void css_reset(void)
844 unsigned long long timeout;
847 /* Reset subchannels. */
848 for_each_subchannel(__shutdown_subchannel_easy, NULL);
849 /* Reset channel paths. */
850 s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler;
851 /* Enable channel report machine checks. */
852 __ctl_set_bit(14, 28);
853 /* Temporarily reenable machine checks. */
856 for (i = 0; i <= __MAX_CHPID; i++) {
859 if ((ret == 0) || (ret == 2))
861 * rchp either succeeded, or another rchp is already
862 * in progress. In either case, we'll get a crw.
864 atomic_inc(&chpid_reset_count);
866 /* Wait for machine check for all channel paths. */
867 timeout = get_tod_clock_fast() + (RCHP_TIMEOUT << 12);
868 while (atomic_read(&chpid_reset_count) != 0) {
869 if (get_tod_clock_fast() > timeout)
873 /* Disable machine checks again. */
874 local_mcck_disable();
875 /* Disable channel report machine checks. */
876 __ctl_clear_bit(14, 28);
877 s390_base_mcck_handler_fn = NULL;
880 static struct reset_call css_reset_call = {
884 static int __init init_css_reset_call(void)
886 atomic_set(&chpid_reset_count, 0);
887 register_reset_call(&css_reset_call);
891 arch_initcall(init_css_reset_call);
893 struct sch_match_id {
894 struct subchannel_id schid;
895 struct ccw_dev_id devid;
899 static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
902 struct sch_match_id *match_id = data;
904 if (stsch_reset(schid, &schib))
906 if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
907 (schib.pmcw.dev == match_id->devid.devno) &&
908 (schid.ssid == match_id->devid.ssid)) {
909 match_id->schid = schid;
916 static int reipl_find_schid(struct ccw_dev_id *devid,
917 struct subchannel_id *schid)
919 struct sch_match_id match_id;
921 match_id.devid = *devid;
922 match_id.rc = -ENODEV;
923 for_each_subchannel(__reipl_subchannel_match, &match_id);
924 if (match_id.rc == 0)
925 *schid = match_id.schid;
929 extern void do_reipl_asm(__u32 schid);
931 /* Make sure all subchannels are quiet before we re-ipl an lpar. */
932 void reipl_ccw_dev(struct ccw_dev_id *devid)
934 struct subchannel_id uninitialized_var(schid);
936 s390_reset_system(NULL, NULL);
937 if (reipl_find_schid(devid, &schid) != 0)
938 panic("IPL Device not found\n");
939 do_reipl_asm(*((__u32*)&schid));
942 int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
944 struct subchannel_id schid;
947 schid = *(struct subchannel_id *)&S390_lowcore.subchannel_id;
950 if (stsch_err(schid, &schib))
952 if (schib.pmcw.st != SUBCHANNEL_TYPE_IO)
956 iplinfo->devno = schib.pmcw.dev;
957 iplinfo->is_qdio = schib.pmcw.qf;
962 * cio_tm_start_key - perform start function
963 * @sch: subchannel on which to perform the start function
964 * @tcw: transport-command word to be started
965 * @lpm: mask of paths to use
966 * @key: storage key to use for storage access
968 * Start the tcw on the given subchannel. Return zero on success, non-zero
971 int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key)
974 union orb *orb = &to_io_private(sch)->orb;
976 memset(orb, 0, sizeof(union orb));
977 orb->tm.intparm = (u32) (addr_t) sch;
978 orb->tm.key = key >> 4;
980 orb->tm.lpm = lpm ? lpm : sch->lpm;
981 orb->tm.tcw = (u32) (addr_t) tcw;
982 cc = ssch(sch->schid, orb);
990 return cio_start_handle_notoper(sch, lpm);
995 * cio_tm_intrg - perform interrogate function
996 * @sch - subchannel on which to perform the interrogate function
998 * If the specified subchannel is running in transport-mode, perform the
999 * interrogate function. Return zero on success, non-zero otherwie.
1001 int cio_tm_intrg(struct subchannel *sch)
1005 if (!to_io_private(sch)->orb.tm.b)
1007 cc = xsch(sch->schid);