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/sched/cputime.h>
41 #include "blacklist.h"
42 #include "cio_debug.h"
46 debug_info_t *cio_debug_msg_id;
47 debug_info_t *cio_debug_trace_id;
48 debug_info_t *cio_debug_crw_id;
50 DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb);
51 EXPORT_PER_CPU_SYMBOL(cio_irb);
54 * Function: cio_debug_init
55 * Initializes three debug logs for common I/O:
56 * - cio_msg logs generic cio messages
57 * - cio_trace logs the calling of different functions
58 * - cio_crw logs machine check related cio messages
60 static int __init cio_debug_init(void)
62 cio_debug_msg_id = debug_register("cio_msg", 16, 1, 11 * sizeof(long));
63 if (!cio_debug_msg_id)
65 debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
66 debug_set_level(cio_debug_msg_id, 2);
67 cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16);
68 if (!cio_debug_trace_id)
70 debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
71 debug_set_level(cio_debug_trace_id, 2);
72 cio_debug_crw_id = debug_register("cio_crw", 8, 1, 8 * sizeof(long));
73 if (!cio_debug_crw_id)
75 debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
76 debug_set_level(cio_debug_crw_id, 4);
80 debug_unregister(cio_debug_msg_id);
81 debug_unregister(cio_debug_trace_id);
82 debug_unregister(cio_debug_crw_id);
86 arch_initcall (cio_debug_init);
88 int cio_set_options(struct subchannel *sch, int flags)
90 struct io_subchannel_private *priv = to_io_private(sch);
92 priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0;
93 priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0;
94 priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0;
99 cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
108 CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
109 "subchannel 0.%x.%04x!\n", sch->schid.ssid,
112 if (cio_update_schib(sch))
115 sprintf(dbf_text, "no%s", dev_name(&sch->dev));
116 CIO_TRACE_EVENT(0, dbf_text);
117 CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
119 return (sch->lpm ? -EACCES : -ENODEV);
123 cio_start_key (struct subchannel *sch, /* subchannel structure */
124 struct ccw1 * cpa, /* logical channel prog addr */
125 __u8 lpm, /* logical path mask */
126 __u8 key) /* storage key */
128 struct io_subchannel_private *priv = to_io_private(sch);
129 union orb *orb = &priv->orb;
132 CIO_TRACE_EVENT(5, "stIO");
133 CIO_TRACE_EVENT(5, dev_name(&sch->dev));
135 memset(orb, 0, sizeof(union orb));
136 /* sch is always under 2G. */
137 orb->cmd.intparm = (u32)(addr_t)sch;
140 orb->cmd.pfch = priv->options.prefetch == 0;
141 orb->cmd.spnd = priv->options.suspend;
142 orb->cmd.ssic = priv->options.suspend && priv->options.inter;
143 orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;
145 * for 64 bit we always support 64 bit IDAWs with 4k page size only
149 orb->cmd.key = key >> 4;
150 /* issue "Start Subchannel" */
151 orb->cmd.cpa = (__u32) __pa(cpa);
152 ccode = ssch(sch->schid, orb);
154 /* process condition code */
155 CIO_HEX_EVENT(5, &ccode, sizeof(ccode));
160 * initialize device status information
162 sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
164 case 1: /* status pending */
167 case 3: /* device/path not operational */
168 return cio_start_handle_notoper(sch, lpm);
173 EXPORT_SYMBOL_GPL(cio_start_key);
176 cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
178 return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
180 EXPORT_SYMBOL_GPL(cio_start);
183 * resume suspended I/O operation
186 cio_resume (struct subchannel *sch)
190 CIO_TRACE_EVENT(4, "resIO");
191 CIO_TRACE_EVENT(4, dev_name(&sch->dev));
193 ccode = rsch (sch->schid);
195 CIO_HEX_EVENT(4, &ccode, sizeof(ccode));
199 sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;
207 * useless to wait for request completion
208 * as device is no longer operational !
213 EXPORT_SYMBOL_GPL(cio_resume);
219 cio_halt(struct subchannel *sch)
226 CIO_TRACE_EVENT(2, "haltIO");
227 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
230 * Issue "Halt subchannel" and process condition code
232 ccode = hsch (sch->schid);
234 CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
238 sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
240 case 1: /* status pending */
243 default: /* device not operational */
247 EXPORT_SYMBOL_GPL(cio_halt);
250 * Clear I/O operation
253 cio_clear(struct subchannel *sch)
260 CIO_TRACE_EVENT(2, "clearIO");
261 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
264 * Issue "Clear subchannel" and process condition code
266 ccode = csch (sch->schid);
268 CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
272 sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;
274 default: /* device not operational */
278 EXPORT_SYMBOL_GPL(cio_clear);
281 * Function: cio_cancel
282 * Issues a "Cancel Subchannel" on the specified subchannel
283 * Note: We don't need any fancy intparms and flags here
284 * since xsch is executed synchronously.
285 * Only for common I/O internal use as for now.
288 cio_cancel (struct subchannel *sch)
295 CIO_TRACE_EVENT(2, "cancelIO");
296 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
298 ccode = xsch (sch->schid);
300 CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
303 case 0: /* success */
304 /* Update information in scsw. */
305 if (cio_update_schib(sch))
308 case 1: /* status pending */
310 case 2: /* not applicable */
312 default: /* not oper */
316 EXPORT_SYMBOL_GPL(cio_cancel);
319 * cio_cancel_halt_clear - Cancel running I/O by performing cancel, halt
320 * and clear ordinally if subchannel is valid.
321 * @sch: subchannel on which to perform the cancel_halt_clear operation
322 * @iretry: the number of the times remained to retry the next operation
324 * This should be called repeatedly since halt/clear are asynchronous
325 * operations. We do one try with cio_cancel, three tries with cio_halt,
326 * 255 tries with cio_clear. The caller should initialize @iretry with
327 * the value 255 for its first call to this, and keep using the same
328 * @iretry in the subsequent calls until it gets a non -EBUSY return.
330 * Returns 0 if device now idle, -ENODEV for device not operational,
331 * -EBUSY if an interrupt is expected (either from halt/clear or from a
332 * status pending), and -EIO if out of retries.
334 int cio_cancel_halt_clear(struct subchannel *sch, int *iretry)
338 if (cio_update_schib(sch))
340 if (!sch->schib.pmcw.ena)
341 /* Not operational -> done. */
343 /* Stage 1: cancel io. */
344 if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
345 !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
346 if (!scsw_is_tm(&sch->schib.scsw)) {
347 ret = cio_cancel(sch);
352 * Cancel io unsuccessful or not applicable (transport mode).
353 * Continue with asynchronous instructions.
355 *iretry = 3; /* 3 halt retries. */
357 /* Stage 2: halt io. */
358 if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
363 return (ret == 0) ? -EBUSY : ret;
365 /* Halt io unsuccessful. */
366 *iretry = 255; /* 255 clear retries. */
368 /* Stage 3: clear io. */
371 ret = cio_clear(sch);
372 return (ret == 0) ? -EBUSY : ret;
374 /* Function was unsuccessful */
377 EXPORT_SYMBOL_GPL(cio_cancel_halt_clear);
379 static void cio_apply_config(struct subchannel *sch, struct schib *schib)
381 schib->pmcw.intparm = sch->config.intparm;
382 schib->pmcw.mbi = sch->config.mbi;
383 schib->pmcw.isc = sch->config.isc;
384 schib->pmcw.ena = sch->config.ena;
385 schib->pmcw.mme = sch->config.mme;
386 schib->pmcw.mp = sch->config.mp;
387 schib->pmcw.csense = sch->config.csense;
388 schib->pmcw.mbfc = sch->config.mbfc;
389 if (sch->config.mbfc)
390 schib->mba = sch->config.mba;
393 static int cio_check_config(struct subchannel *sch, struct schib *schib)
395 return (schib->pmcw.intparm == sch->config.intparm) &&
396 (schib->pmcw.mbi == sch->config.mbi) &&
397 (schib->pmcw.isc == sch->config.isc) &&
398 (schib->pmcw.ena == sch->config.ena) &&
399 (schib->pmcw.mme == sch->config.mme) &&
400 (schib->pmcw.mp == sch->config.mp) &&
401 (schib->pmcw.csense == sch->config.csense) &&
402 (schib->pmcw.mbfc == sch->config.mbfc) &&
403 (!sch->config.mbfc || (schib->mba == sch->config.mba));
407 * cio_commit_config - apply configuration to the subchannel
409 int cio_commit_config(struct subchannel *sch)
411 int ccode, retry, ret = 0;
415 if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
418 for (retry = 0; retry < 5; retry++) {
419 /* copy desired changes to local schib */
420 cio_apply_config(sch, &schib);
421 ccode = msch(sch->schid, &schib);
422 if (ccode < 0) /* -EIO if msch gets a program check. */
425 case 0: /* successful */
426 if (stsch(sch->schid, &schib) ||
427 !css_sch_is_valid(&schib))
429 if (cio_check_config(sch, &schib)) {
430 /* commit changes from local schib */
431 memcpy(&sch->schib, &schib, sizeof(schib));
436 case 1: /* status pending */
438 if (tsch(sch->schid, &irb))
442 udelay(100); /* allow for recovery */
445 case 3: /* not operational */
451 EXPORT_SYMBOL_GPL(cio_commit_config);
454 * cio_update_schib - Perform stsch and update schib if subchannel is valid.
455 * @sch: subchannel on which to perform stsch
456 * Return zero on success, -ENODEV otherwise.
458 int cio_update_schib(struct subchannel *sch)
462 if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
465 memcpy(&sch->schib, &schib, sizeof(schib));
468 EXPORT_SYMBOL_GPL(cio_update_schib);
471 * cio_enable_subchannel - enable a subchannel.
472 * @sch: subchannel to be enabled
473 * @intparm: interruption parameter to set
475 int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
479 CIO_TRACE_EVENT(2, "ensch");
480 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
482 if (sch_is_pseudo_sch(sch))
484 if (cio_update_schib(sch))
488 sch->config.isc = sch->isc;
489 sch->config.intparm = intparm;
491 ret = cio_commit_config(sch);
494 * Got a program check in msch. Try without
495 * the concurrent sense bit the next time.
497 sch->config.csense = 0;
498 ret = cio_commit_config(sch);
500 CIO_HEX_EVENT(2, &ret, sizeof(ret));
503 EXPORT_SYMBOL_GPL(cio_enable_subchannel);
506 * cio_disable_subchannel - disable a subchannel.
507 * @sch: subchannel to disable
509 int cio_disable_subchannel(struct subchannel *sch)
513 CIO_TRACE_EVENT(2, "dissch");
514 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
516 if (sch_is_pseudo_sch(sch))
518 if (cio_update_schib(sch))
522 ret = cio_commit_config(sch);
524 CIO_HEX_EVENT(2, &ret, sizeof(ret));
527 EXPORT_SYMBOL_GPL(cio_disable_subchannel);
529 static int cio_check_devno_blacklisted(struct subchannel *sch)
531 if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) {
533 * This device must not be known to Linux. So we simply
534 * say that there is no device and return ENODEV.
536 CIO_MSG_EVENT(6, "Blacklisted device detected "
537 "at devno %04X, subchannel set %x\n",
538 sch->schib.pmcw.dev, sch->schid.ssid);
545 * cio_validate_subchannel - basic validation of subchannel
546 * @sch: subchannel structure to be filled out
547 * @schid: subchannel id
549 * Find out subchannel type and initialize struct subchannel.
552 * -ENXIO for non-defined subchannels
553 * -ENODEV for invalid subchannels or blacklisted devices
554 * -EIO for subchannels in an invalid subchannel set
556 int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid)
562 sprintf(dbf_txt, "valsch%x", schid.sch_no);
563 CIO_TRACE_EVENT(4, dbf_txt);
566 * The first subchannel that is not-operational (ccode==3)
567 * indicates that there aren't any more devices available.
568 * If stsch gets an exception, it means the current subchannel set
571 ccode = stsch(schid, &sch->schib);
573 err = (ccode == 3) ? -ENXIO : ccode;
576 sch->st = sch->schib.pmcw.st;
580 case SUBCHANNEL_TYPE_IO:
581 case SUBCHANNEL_TYPE_MSG:
582 if (!css_sch_is_valid(&sch->schib))
585 err = cio_check_devno_blacklisted(sch);
593 CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
594 sch->schid.ssid, sch->schid.sch_no, sch->st);
600 * do_cio_interrupt() handles all normal I/O device IRQ's
602 static irqreturn_t do_cio_interrupt(int irq, void *dummy)
604 struct tpi_info *tpi_info;
605 struct subchannel *sch;
608 set_cpu_flag(CIF_NOHZ_DELAY);
609 tpi_info = (struct tpi_info *) &get_irq_regs()->int_code;
610 trace_s390_cio_interrupt(tpi_info);
611 irb = this_cpu_ptr(&cio_irb);
612 sch = (struct subchannel *)(unsigned long) tpi_info->intparm;
614 /* Clear pending interrupt condition. */
615 inc_irq_stat(IRQIO_CIO);
616 tsch(tpi_info->schid, irb);
619 spin_lock(sch->lock);
620 /* Store interrupt response block to lowcore. */
621 if (tsch(tpi_info->schid, irb) == 0) {
622 /* Keep subchannel information word up to date. */
623 memcpy (&sch->schib.scsw, &irb->scsw, sizeof (irb->scsw));
624 /* Call interrupt handler if there is one. */
625 if (sch->driver && sch->driver->irq)
626 sch->driver->irq(sch);
628 inc_irq_stat(IRQIO_CIO);
630 inc_irq_stat(IRQIO_CIO);
631 spin_unlock(sch->lock);
636 static struct irqaction io_interrupt = {
638 .handler = do_cio_interrupt,
641 void __init init_cio_interrupts(void)
643 irq_set_chip_and_handler(IO_INTERRUPT,
644 &dummy_irq_chip, handle_percpu_irq);
645 setup_irq(IO_INTERRUPT, &io_interrupt);
648 #ifdef CONFIG_CCW_CONSOLE
649 static struct subchannel *console_sch;
650 static struct lock_class_key console_sch_key;
653 * Use cio_tsch to update the subchannel status and call the interrupt handler
654 * if status had been pending. Called with the subchannel's lock held.
656 void cio_tsch(struct subchannel *sch)
661 irb = this_cpu_ptr(&cio_irb);
662 /* Store interrupt response block to lowcore. */
663 if (tsch(sch->schid, irb) != 0)
664 /* Not status pending or not operational. */
666 memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw));
667 /* Call interrupt handler with updated status. */
668 irq_context = in_interrupt();
673 kstat_incr_irq_this_cpu(IO_INTERRUPT);
674 if (sch->driver && sch->driver->irq)
675 sch->driver->irq(sch);
677 inc_irq_stat(IRQIO_CIO);
684 static int cio_test_for_console(struct subchannel_id schid, void *data)
688 if (stsch(schid, &schib) != 0)
690 if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
691 (schib.pmcw.dev == console_devno)) {
692 console_irq = schid.sch_no;
693 return 1; /* found */
698 static int cio_get_console_sch_no(void)
700 struct subchannel_id schid;
703 init_subchannel_id(&schid);
704 if (console_irq != -1) {
705 /* VM provided us with the irq number of the console. */
706 schid.sch_no = console_irq;
707 if (stsch(schid, &schib) != 0 ||
708 (schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv)
710 console_devno = schib.pmcw.dev;
711 } else if (console_devno != -1) {
712 /* At least the console device number is known. */
713 for_each_subchannel(cio_test_for_console, NULL);
718 struct subchannel *cio_probe_console(void)
720 struct subchannel_id schid;
721 struct subchannel *sch;
724 sch_no = cio_get_console_sch_no();
726 pr_warn("No CCW console was found\n");
727 return ERR_PTR(-ENODEV);
729 init_subchannel_id(&schid);
730 schid.sch_no = sch_no;
731 sch = css_alloc_subchannel(schid);
735 lockdep_set_class(sch->lock, &console_sch_key);
736 isc_register(CONSOLE_ISC);
737 sch->config.isc = CONSOLE_ISC;
738 sch->config.intparm = (u32)(addr_t)sch;
739 ret = cio_commit_config(sch);
741 isc_unregister(CONSOLE_ISC);
742 put_device(&sch->dev);
749 int cio_is_console(struct subchannel_id schid)
753 return schid_equal(&schid, &console_sch->schid);
756 void cio_register_early_subchannels(void)
763 ret = css_register_subchannel(console_sch);
765 put_device(&console_sch->dev);
767 #endif /* CONFIG_CCW_CONSOLE */
770 __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
775 for (retry=0;retry<3;retry++) {
777 cc = msch(schid, schib);
779 return (cc==3?-ENODEV:-EBUSY);
780 if (stsch(schid, schib) || !css_sch_is_valid(schib))
782 if (!schib->pmcw.ena)
785 return -EBUSY; /* uhm... */
789 __clear_io_subchannel_easy(struct subchannel_id schid)
795 for (retry=0;retry<20;retry++) {
799 tsch(ti.schid, this_cpu_ptr(&cio_irb));
800 if (schid_equal(&ti.schid, &schid))
808 static void __clear_chsc_subchannel_easy(void)
810 /* It seems we can only wait for a bit here :/ */
814 static int pgm_check_occured;
816 static void cio_reset_pgm_check_handler(void)
818 pgm_check_occured = 1;
821 static int stsch_reset(struct subchannel_id schid, struct schib *addr)
825 pgm_check_occured = 0;
826 s390_base_pgm_handler_fn = cio_reset_pgm_check_handler;
827 rc = stsch(schid, addr);
828 s390_base_pgm_handler_fn = NULL;
830 /* The program check handler could have changed pgm_check_occured. */
833 if (pgm_check_occured)
839 static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
843 if (stsch_reset(schid, &schib))
847 switch(__disable_subchannel_easy(schid, &schib)) {
851 default: /* -EBUSY */
852 switch (schib.pmcw.st) {
853 case SUBCHANNEL_TYPE_IO:
854 if (__clear_io_subchannel_easy(schid))
855 goto out; /* give up... */
857 case SUBCHANNEL_TYPE_CHSC:
858 __clear_chsc_subchannel_easy();
861 /* No default clear strategy */
864 stsch(schid, &schib);
865 __disable_subchannel_easy(schid, &schib);
871 static atomic_t chpid_reset_count;
873 static void s390_reset_chpids_mcck_handler(void)
878 /* Check for pending channel report word. */
879 mci.val = S390_lowcore.mcck_interruption_code;
882 /* Process channel report words. */
883 while (stcrw(&crw) == 0) {
884 /* Check for responses to RCHP. */
885 if (crw.slct && crw.rsc == CRW_RSC_CPATH)
886 atomic_dec(&chpid_reset_count);
890 #define RCHP_TIMEOUT (30 * USEC_PER_SEC)
891 static void css_reset(void)
894 unsigned long long timeout;
897 /* Reset subchannels. */
898 for_each_subchannel(__shutdown_subchannel_easy, NULL);
899 /* Reset channel paths. */
900 s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler;
901 /* Enable channel report machine checks. */
902 __ctl_set_bit(14, 28);
903 /* Temporarily reenable machine checks. */
906 for (i = 0; i <= __MAX_CHPID; i++) {
909 if ((ret == 0) || (ret == 2))
911 * rchp either succeeded, or another rchp is already
912 * in progress. In either case, we'll get a crw.
914 atomic_inc(&chpid_reset_count);
916 /* Wait for machine check for all channel paths. */
917 timeout = get_tod_clock_fast() + (RCHP_TIMEOUT << 12);
918 while (atomic_read(&chpid_reset_count) != 0) {
919 if (get_tod_clock_fast() > timeout)
923 /* Disable machine checks again. */
924 local_mcck_disable();
925 /* Disable channel report machine checks. */
926 __ctl_clear_bit(14, 28);
927 s390_base_mcck_handler_fn = NULL;
930 static struct reset_call css_reset_call = {
934 static int __init init_css_reset_call(void)
936 atomic_set(&chpid_reset_count, 0);
937 register_reset_call(&css_reset_call);
941 arch_initcall(init_css_reset_call);
943 struct sch_match_id {
944 struct subchannel_id schid;
945 struct ccw_dev_id devid;
949 static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
952 struct sch_match_id *match_id = data;
954 if (stsch_reset(schid, &schib))
956 if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
957 (schib.pmcw.dev == match_id->devid.devno) &&
958 (schid.ssid == match_id->devid.ssid)) {
959 match_id->schid = schid;
966 static int reipl_find_schid(struct ccw_dev_id *devid,
967 struct subchannel_id *schid)
969 struct sch_match_id match_id;
971 match_id.devid = *devid;
972 match_id.rc = -ENODEV;
973 for_each_subchannel(__reipl_subchannel_match, &match_id);
974 if (match_id.rc == 0)
975 *schid = match_id.schid;
979 extern void do_reipl_asm(__u32 schid);
981 /* Make sure all subchannels are quiet before we re-ipl an lpar. */
982 void reipl_ccw_dev(struct ccw_dev_id *devid)
984 struct subchannel_id uninitialized_var(schid);
987 if (reipl_find_schid(devid, &schid) != 0)
988 panic("IPL Device not found\n");
989 do_reipl_asm(*((__u32*)&schid));
992 int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
994 static struct chsc_sda_area sda_area __initdata;
995 struct subchannel_id schid;
998 schid = *(struct subchannel_id *)&S390_lowcore.subchannel_id;
1004 * Firmware should have already enabled MSS but whoever started
1005 * the kernel might have initiated a channel subsystem reset.
1006 * Ensure that MSS is enabled.
1008 memset(&sda_area, 0, sizeof(sda_area));
1009 if (__chsc_enable_facility(&sda_area, CHSC_SDA_OC_MSS))
1012 if (stsch(schid, &schib))
1014 if (schib.pmcw.st != SUBCHANNEL_TYPE_IO)
1016 if (!schib.pmcw.dnv)
1019 iplinfo->ssid = schid.ssid;
1020 iplinfo->devno = schib.pmcw.dev;
1021 iplinfo->is_qdio = schib.pmcw.qf;
1026 * cio_tm_start_key - perform start function
1027 * @sch: subchannel on which to perform the start function
1028 * @tcw: transport-command word to be started
1029 * @lpm: mask of paths to use
1030 * @key: storage key to use for storage access
1032 * Start the tcw on the given subchannel. Return zero on success, non-zero
1035 int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key)
1038 union orb *orb = &to_io_private(sch)->orb;
1040 memset(orb, 0, sizeof(union orb));
1041 orb->tm.intparm = (u32) (addr_t) sch;
1042 orb->tm.key = key >> 4;
1044 orb->tm.lpm = lpm ? lpm : sch->lpm;
1045 orb->tm.tcw = (u32) (addr_t) tcw;
1046 cc = ssch(sch->schid, orb);
1054 return cio_start_handle_notoper(sch, lpm);
1057 EXPORT_SYMBOL_GPL(cio_tm_start_key);
1060 * cio_tm_intrg - perform interrogate function
1061 * @sch - subchannel on which to perform the interrogate function
1063 * If the specified subchannel is running in transport-mode, perform the
1064 * interrogate function. Return zero on success, non-zero otherwie.
1066 int cio_tm_intrg(struct subchannel *sch)
1070 if (!to_io_private(sch)->orb.tm.b)
1072 cc = xsch(sch->schid);
1083 EXPORT_SYMBOL_GPL(cio_tm_intrg);