1 // SPDX-License-Identifier: GPL-2.0
3 * S/390 common I/O routines -- low level i/o calls
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)
9 * Martin Schwidefsky (schwidefsky@de.ibm.com)
12 #define KMSG_COMPONENT "cio"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15 #include <linux/ftrace.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/slab.h>
19 #include <linux/device.h>
20 #include <linux/kernel_stat.h>
21 #include <linux/interrupt.h>
22 #include <linux/irq.h>
24 #include <asm/delay.h>
26 #include <asm/irq_regs.h>
27 #include <asm/setup.h>
28 #include <asm/reset.h>
30 #include <asm/chpid.h>
33 #include <linux/sched/cputime.h>
42 #include "blacklist.h"
43 #include "cio_debug.h"
47 debug_info_t *cio_debug_msg_id;
48 debug_info_t *cio_debug_trace_id;
49 debug_info_t *cio_debug_crw_id;
51 DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb);
52 EXPORT_PER_CPU_SYMBOL(cio_irb);
55 * Function: cio_debug_init
56 * Initializes three debug logs for common I/O:
57 * - cio_msg logs generic cio messages
58 * - cio_trace logs the calling of different functions
59 * - cio_crw logs machine check related cio messages
61 static int __init cio_debug_init(void)
63 cio_debug_msg_id = debug_register("cio_msg", 16, 1, 11 * sizeof(long));
64 if (!cio_debug_msg_id)
66 debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
67 debug_set_level(cio_debug_msg_id, 2);
68 cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16);
69 if (!cio_debug_trace_id)
71 debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
72 debug_set_level(cio_debug_trace_id, 2);
73 cio_debug_crw_id = debug_register("cio_crw", 8, 1, 8 * sizeof(long));
74 if (!cio_debug_crw_id)
76 debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
77 debug_set_level(cio_debug_crw_id, 4);
81 debug_unregister(cio_debug_msg_id);
82 debug_unregister(cio_debug_trace_id);
83 debug_unregister(cio_debug_crw_id);
87 arch_initcall (cio_debug_init);
89 int cio_set_options(struct subchannel *sch, int flags)
91 struct io_subchannel_private *priv = to_io_private(sch);
93 priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0;
94 priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0;
95 priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0;
100 cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
109 CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
110 "subchannel 0.%x.%04x!\n", sch->schid.ssid,
113 if (cio_update_schib(sch))
116 sprintf(dbf_text, "no%s", dev_name(&sch->dev));
117 CIO_TRACE_EVENT(0, dbf_text);
118 CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
120 return (sch->lpm ? -EACCES : -ENODEV);
124 cio_start_key (struct subchannel *sch, /* subchannel structure */
125 struct ccw1 * cpa, /* logical channel prog addr */
126 __u8 lpm, /* logical path mask */
127 __u8 key) /* storage key */
129 struct io_subchannel_private *priv = to_io_private(sch);
130 union orb *orb = &priv->orb;
133 CIO_TRACE_EVENT(5, "stIO");
134 CIO_TRACE_EVENT(5, dev_name(&sch->dev));
136 memset(orb, 0, sizeof(union orb));
137 /* sch is always under 2G. */
138 orb->cmd.intparm = (u32)(addr_t)sch;
141 orb->cmd.pfch = priv->options.prefetch == 0;
142 orb->cmd.spnd = priv->options.suspend;
143 orb->cmd.ssic = priv->options.suspend && priv->options.inter;
144 orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;
146 * 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);
174 EXPORT_SYMBOL_GPL(cio_start_key);
177 cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
179 return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
181 EXPORT_SYMBOL_GPL(cio_start);
184 * resume suspended I/O operation
187 cio_resume (struct subchannel *sch)
191 CIO_TRACE_EVENT(4, "resIO");
192 CIO_TRACE_EVENT(4, dev_name(&sch->dev));
194 ccode = rsch (sch->schid);
196 CIO_HEX_EVENT(4, &ccode, sizeof(ccode));
200 sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;
208 * useless to wait for request completion
209 * as device is no longer operational !
214 EXPORT_SYMBOL_GPL(cio_resume);
220 cio_halt(struct subchannel *sch)
227 CIO_TRACE_EVENT(2, "haltIO");
228 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
231 * Issue "Halt subchannel" and process condition code
233 ccode = hsch (sch->schid);
235 CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
239 sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
241 case 1: /* status pending */
244 default: /* device not operational */
248 EXPORT_SYMBOL_GPL(cio_halt);
251 * Clear I/O operation
254 cio_clear(struct subchannel *sch)
261 CIO_TRACE_EVENT(2, "clearIO");
262 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
265 * Issue "Clear subchannel" and process condition code
267 ccode = csch (sch->schid);
269 CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
273 sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;
275 default: /* device not operational */
279 EXPORT_SYMBOL_GPL(cio_clear);
282 * Function: cio_cancel
283 * Issues a "Cancel Subchannel" on the specified subchannel
284 * Note: We don't need any fancy intparms and flags here
285 * since xsch is executed synchronously.
286 * Only for common I/O internal use as for now.
289 cio_cancel (struct subchannel *sch)
296 CIO_TRACE_EVENT(2, "cancelIO");
297 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
299 ccode = xsch (sch->schid);
301 CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
304 case 0: /* success */
305 /* Update information in scsw. */
306 if (cio_update_schib(sch))
309 case 1: /* status pending */
311 case 2: /* not applicable */
313 default: /* not oper */
317 EXPORT_SYMBOL_GPL(cio_cancel);
320 * cio_cancel_halt_clear - Cancel running I/O by performing cancel, halt
321 * and clear ordinally if subchannel is valid.
322 * @sch: subchannel on which to perform the cancel_halt_clear operation
323 * @iretry: the number of the times remained to retry the next operation
325 * This should be called repeatedly since halt/clear are asynchronous
326 * operations. We do one try with cio_cancel, three tries with cio_halt,
327 * 255 tries with cio_clear. The caller should initialize @iretry with
328 * the value 255 for its first call to this, and keep using the same
329 * @iretry in the subsequent calls until it gets a non -EBUSY return.
331 * Returns 0 if device now idle, -ENODEV for device not operational,
332 * -EBUSY if an interrupt is expected (either from halt/clear or from a
333 * status pending), and -EIO if out of retries.
335 int cio_cancel_halt_clear(struct subchannel *sch, int *iretry)
339 if (cio_update_schib(sch))
341 if (!sch->schib.pmcw.ena)
342 /* Not operational -> done. */
344 /* Stage 1: cancel io. */
345 if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
346 !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
347 if (!scsw_is_tm(&sch->schib.scsw)) {
348 ret = cio_cancel(sch);
353 * Cancel io unsuccessful or not applicable (transport mode).
354 * Continue with asynchronous instructions.
356 *iretry = 3; /* 3 halt retries. */
358 /* Stage 2: halt io. */
359 if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
364 return (ret == 0) ? -EBUSY : ret;
366 /* Halt io unsuccessful. */
367 *iretry = 255; /* 255 clear retries. */
369 /* Stage 3: clear io. */
372 ret = cio_clear(sch);
373 return (ret == 0) ? -EBUSY : ret;
375 /* Function was unsuccessful */
378 EXPORT_SYMBOL_GPL(cio_cancel_halt_clear);
380 static void cio_apply_config(struct subchannel *sch, struct schib *schib)
382 schib->pmcw.intparm = sch->config.intparm;
383 schib->pmcw.mbi = sch->config.mbi;
384 schib->pmcw.isc = sch->config.isc;
385 schib->pmcw.ena = sch->config.ena;
386 schib->pmcw.mme = sch->config.mme;
387 schib->pmcw.mp = sch->config.mp;
388 schib->pmcw.csense = sch->config.csense;
389 schib->pmcw.mbfc = sch->config.mbfc;
390 if (sch->config.mbfc)
391 schib->mba = sch->config.mba;
394 static int cio_check_config(struct subchannel *sch, struct schib *schib)
396 return (schib->pmcw.intparm == sch->config.intparm) &&
397 (schib->pmcw.mbi == sch->config.mbi) &&
398 (schib->pmcw.isc == sch->config.isc) &&
399 (schib->pmcw.ena == sch->config.ena) &&
400 (schib->pmcw.mme == sch->config.mme) &&
401 (schib->pmcw.mp == sch->config.mp) &&
402 (schib->pmcw.csense == sch->config.csense) &&
403 (schib->pmcw.mbfc == sch->config.mbfc) &&
404 (!sch->config.mbfc || (schib->mba == sch->config.mba));
408 * cio_commit_config - apply configuration to the subchannel
410 int cio_commit_config(struct subchannel *sch)
412 int ccode, retry, ret = 0;
416 if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
419 for (retry = 0; retry < 5; retry++) {
420 /* copy desired changes to local schib */
421 cio_apply_config(sch, &schib);
422 ccode = msch(sch->schid, &schib);
423 if (ccode < 0) /* -EIO if msch gets a program check. */
426 case 0: /* successful */
427 if (stsch(sch->schid, &schib) ||
428 !css_sch_is_valid(&schib))
430 if (cio_check_config(sch, &schib)) {
431 /* commit changes from local schib */
432 memcpy(&sch->schib, &schib, sizeof(schib));
437 case 1: /* status pending */
439 if (tsch(sch->schid, &irb))
443 udelay(100); /* allow for recovery */
446 case 3: /* not operational */
452 EXPORT_SYMBOL_GPL(cio_commit_config);
455 * cio_update_schib - Perform stsch and update schib if subchannel is valid.
456 * @sch: subchannel on which to perform stsch
457 * Return zero on success, -ENODEV otherwise.
459 int cio_update_schib(struct subchannel *sch)
463 if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
466 memcpy(&sch->schib, &schib, sizeof(schib));
469 EXPORT_SYMBOL_GPL(cio_update_schib);
472 * cio_enable_subchannel - enable a subchannel.
473 * @sch: subchannel to be enabled
474 * @intparm: interruption parameter to set
476 int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
480 CIO_TRACE_EVENT(2, "ensch");
481 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
483 if (sch_is_pseudo_sch(sch))
485 if (cio_update_schib(sch))
489 sch->config.isc = sch->isc;
490 sch->config.intparm = intparm;
492 ret = cio_commit_config(sch);
495 * Got a program check in msch. Try without
496 * the concurrent sense bit the next time.
498 sch->config.csense = 0;
499 ret = cio_commit_config(sch);
501 CIO_HEX_EVENT(2, &ret, sizeof(ret));
504 EXPORT_SYMBOL_GPL(cio_enable_subchannel);
507 * cio_disable_subchannel - disable a subchannel.
508 * @sch: subchannel to disable
510 int cio_disable_subchannel(struct subchannel *sch)
514 CIO_TRACE_EVENT(2, "dissch");
515 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
517 if (sch_is_pseudo_sch(sch))
519 if (cio_update_schib(sch))
523 ret = cio_commit_config(sch);
525 CIO_HEX_EVENT(2, &ret, sizeof(ret));
528 EXPORT_SYMBOL_GPL(cio_disable_subchannel);
530 static int cio_check_devno_blacklisted(struct subchannel *sch)
532 if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) {
534 * This device must not be known to Linux. So we simply
535 * say that there is no device and return ENODEV.
537 CIO_MSG_EVENT(6, "Blacklisted device detected "
538 "at devno %04X, subchannel set %x\n",
539 sch->schib.pmcw.dev, sch->schid.ssid);
546 * cio_validate_subchannel - basic validation of subchannel
547 * @sch: subchannel structure to be filled out
548 * @schid: subchannel id
550 * Find out subchannel type and initialize struct subchannel.
553 * -ENXIO for non-defined subchannels
554 * -ENODEV for invalid subchannels or blacklisted devices
555 * -EIO for subchannels in an invalid subchannel set
557 int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid)
563 sprintf(dbf_txt, "valsch%x", schid.sch_no);
564 CIO_TRACE_EVENT(4, dbf_txt);
567 * The first subchannel that is not-operational (ccode==3)
568 * indicates that there aren't any more devices available.
569 * If stsch gets an exception, it means the current subchannel set
572 ccode = stsch(schid, &sch->schib);
574 err = (ccode == 3) ? -ENXIO : ccode;
577 sch->st = sch->schib.pmcw.st;
581 case SUBCHANNEL_TYPE_IO:
582 case SUBCHANNEL_TYPE_MSG:
583 if (!css_sch_is_valid(&sch->schib))
586 err = cio_check_devno_blacklisted(sch);
594 CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
595 sch->schid.ssid, sch->schid.sch_no, sch->st);
601 * do_cio_interrupt() handles all normal I/O device IRQ's
603 static irqreturn_t do_cio_interrupt(int irq, void *dummy)
605 struct tpi_info *tpi_info;
606 struct subchannel *sch;
609 set_cpu_flag(CIF_NOHZ_DELAY);
610 tpi_info = (struct tpi_info *) &get_irq_regs()->int_code;
611 trace_s390_cio_interrupt(tpi_info);
612 irb = this_cpu_ptr(&cio_irb);
613 sch = (struct subchannel *)(unsigned long) tpi_info->intparm;
615 /* Clear pending interrupt condition. */
616 inc_irq_stat(IRQIO_CIO);
617 tsch(tpi_info->schid, irb);
620 spin_lock(sch->lock);
621 /* Store interrupt response block to lowcore. */
622 if (tsch(tpi_info->schid, irb) == 0) {
623 /* Keep subchannel information word up to date. */
624 memcpy (&sch->schib.scsw, &irb->scsw, sizeof (irb->scsw));
625 /* Call interrupt handler if there is one. */
626 if (sch->driver && sch->driver->irq)
627 sch->driver->irq(sch);
629 inc_irq_stat(IRQIO_CIO);
631 inc_irq_stat(IRQIO_CIO);
632 spin_unlock(sch->lock);
637 static struct irqaction io_interrupt = {
639 .handler = do_cio_interrupt,
642 void __init init_cio_interrupts(void)
644 irq_set_chip_and_handler(IO_INTERRUPT,
645 &dummy_irq_chip, handle_percpu_irq);
646 setup_irq(IO_INTERRUPT, &io_interrupt);
649 #ifdef CONFIG_CCW_CONSOLE
650 static struct subchannel *console_sch;
651 static struct lock_class_key console_sch_key;
654 * Use cio_tsch to update the subchannel status and call the interrupt handler
655 * if status had been pending. Called with the subchannel's lock held.
657 void cio_tsch(struct subchannel *sch)
662 irb = this_cpu_ptr(&cio_irb);
663 /* Store interrupt response block to lowcore. */
664 if (tsch(sch->schid, irb) != 0)
665 /* Not status pending or not operational. */
667 memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw));
668 /* Call interrupt handler with updated status. */
669 irq_context = in_interrupt();
674 kstat_incr_irq_this_cpu(IO_INTERRUPT);
675 if (sch->driver && sch->driver->irq)
676 sch->driver->irq(sch);
678 inc_irq_stat(IRQIO_CIO);
685 static int cio_test_for_console(struct subchannel_id schid, void *data)
689 if (stsch(schid, &schib) != 0)
691 if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
692 (schib.pmcw.dev == console_devno)) {
693 console_irq = schid.sch_no;
694 return 1; /* found */
699 static int cio_get_console_sch_no(void)
701 struct subchannel_id schid;
704 init_subchannel_id(&schid);
705 if (console_irq != -1) {
706 /* VM provided us with the irq number of the console. */
707 schid.sch_no = console_irq;
708 if (stsch(schid, &schib) != 0 ||
709 (schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv)
711 console_devno = schib.pmcw.dev;
712 } else if (console_devno != -1) {
713 /* At least the console device number is known. */
714 for_each_subchannel(cio_test_for_console, NULL);
719 struct subchannel *cio_probe_console(void)
721 struct subchannel_id schid;
722 struct subchannel *sch;
725 sch_no = cio_get_console_sch_no();
727 pr_warn("No CCW console was found\n");
728 return ERR_PTR(-ENODEV);
730 init_subchannel_id(&schid);
731 schid.sch_no = sch_no;
732 sch = css_alloc_subchannel(schid);
736 lockdep_set_class(sch->lock, &console_sch_key);
737 isc_register(CONSOLE_ISC);
738 sch->config.isc = CONSOLE_ISC;
739 sch->config.intparm = (u32)(addr_t)sch;
740 ret = cio_commit_config(sch);
742 isc_unregister(CONSOLE_ISC);
743 put_device(&sch->dev);
750 int cio_is_console(struct subchannel_id schid)
754 return schid_equal(&schid, &console_sch->schid);
757 void cio_register_early_subchannels(void)
764 ret = css_register_subchannel(console_sch);
766 put_device(&console_sch->dev);
768 #endif /* CONFIG_CCW_CONSOLE */
771 __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
776 for (retry=0;retry<3;retry++) {
778 cc = msch(schid, schib);
780 return (cc==3?-ENODEV:-EBUSY);
781 if (stsch(schid, schib) || !css_sch_is_valid(schib))
783 if (!schib->pmcw.ena)
786 return -EBUSY; /* uhm... */
790 __clear_io_subchannel_easy(struct subchannel_id schid)
796 for (retry=0;retry<20;retry++) {
800 tsch(ti.schid, this_cpu_ptr(&cio_irb));
801 if (schid_equal(&ti.schid, &schid))
809 static void __clear_chsc_subchannel_easy(void)
811 /* It seems we can only wait for a bit here :/ */
815 static int pgm_check_occured;
817 static void cio_reset_pgm_check_handler(void)
819 pgm_check_occured = 1;
822 static int stsch_reset(struct subchannel_id schid, struct schib *addr)
826 pgm_check_occured = 0;
827 s390_base_pgm_handler_fn = cio_reset_pgm_check_handler;
828 rc = stsch(schid, addr);
829 s390_base_pgm_handler_fn = NULL;
831 /* The program check handler could have changed pgm_check_occured. */
834 if (pgm_check_occured)
840 static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
844 if (stsch_reset(schid, &schib))
848 switch(__disable_subchannel_easy(schid, &schib)) {
852 default: /* -EBUSY */
853 switch (schib.pmcw.st) {
854 case SUBCHANNEL_TYPE_IO:
855 if (__clear_io_subchannel_easy(schid))
856 goto out; /* give up... */
858 case SUBCHANNEL_TYPE_CHSC:
859 __clear_chsc_subchannel_easy();
862 /* No default clear strategy */
865 stsch(schid, &schib);
866 __disable_subchannel_easy(schid, &schib);
872 static atomic_t chpid_reset_count;
874 static void s390_reset_chpids_mcck_handler(void)
879 /* Check for pending channel report word. */
880 mci.val = S390_lowcore.mcck_interruption_code;
883 /* Process channel report words. */
884 while (stcrw(&crw) == 0) {
885 /* Check for responses to RCHP. */
886 if (crw.slct && crw.rsc == CRW_RSC_CPATH)
887 atomic_dec(&chpid_reset_count);
891 #define RCHP_TIMEOUT (30 * USEC_PER_SEC)
892 static void css_reset(void)
895 unsigned long long timeout;
898 /* Reset subchannels. */
899 for_each_subchannel(__shutdown_subchannel_easy, NULL);
900 /* Reset channel paths. */
901 s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler;
902 /* Enable channel report machine checks. */
903 __ctl_set_bit(14, 28);
904 /* Temporarily reenable machine checks. */
907 for (i = 0; i <= __MAX_CHPID; i++) {
910 if ((ret == 0) || (ret == 2))
912 * rchp either succeeded, or another rchp is already
913 * in progress. In either case, we'll get a crw.
915 atomic_inc(&chpid_reset_count);
917 /* Wait for machine check for all channel paths. */
918 timeout = get_tod_clock_fast() + (RCHP_TIMEOUT << 12);
919 while (atomic_read(&chpid_reset_count) != 0) {
920 if (get_tod_clock_fast() > timeout)
924 /* Disable machine checks again. */
925 local_mcck_disable();
926 /* Disable channel report machine checks. */
927 __ctl_clear_bit(14, 28);
928 s390_base_mcck_handler_fn = NULL;
931 static struct reset_call css_reset_call = {
935 static int __init init_css_reset_call(void)
937 atomic_set(&chpid_reset_count, 0);
938 register_reset_call(&css_reset_call);
942 arch_initcall(init_css_reset_call);
944 struct sch_match_id {
945 struct subchannel_id schid;
946 struct ccw_dev_id devid;
950 static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
953 struct sch_match_id *match_id = data;
955 if (stsch_reset(schid, &schib))
957 if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
958 (schib.pmcw.dev == match_id->devid.devno) &&
959 (schid.ssid == match_id->devid.ssid)) {
960 match_id->schid = schid;
967 static int reipl_find_schid(struct ccw_dev_id *devid,
968 struct subchannel_id *schid)
970 struct sch_match_id match_id;
972 match_id.devid = *devid;
973 match_id.rc = -ENODEV;
974 for_each_subchannel(__reipl_subchannel_match, &match_id);
975 if (match_id.rc == 0)
976 *schid = match_id.schid;
980 extern void do_reipl_asm(__u32 schid);
982 /* Make sure all subchannels are quiet before we re-ipl an lpar. */
983 void reipl_ccw_dev(struct ccw_dev_id *devid)
985 struct subchannel_id uninitialized_var(schid);
988 if (reipl_find_schid(devid, &schid) != 0)
989 panic("IPL Device not found\n");
990 do_reipl_asm(*((__u32*)&schid));
993 int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
995 static struct chsc_sda_area sda_area __initdata;
996 struct subchannel_id schid;
999 schid = *(struct subchannel_id *)&S390_lowcore.subchannel_id;
1005 * Firmware should have already enabled MSS but whoever started
1006 * the kernel might have initiated a channel subsystem reset.
1007 * Ensure that MSS is enabled.
1009 memset(&sda_area, 0, sizeof(sda_area));
1010 if (__chsc_enable_facility(&sda_area, CHSC_SDA_OC_MSS))
1013 if (stsch(schid, &schib))
1015 if (schib.pmcw.st != SUBCHANNEL_TYPE_IO)
1017 if (!schib.pmcw.dnv)
1020 iplinfo->ssid = schid.ssid;
1021 iplinfo->devno = schib.pmcw.dev;
1022 iplinfo->is_qdio = schib.pmcw.qf;
1027 * cio_tm_start_key - perform start function
1028 * @sch: subchannel on which to perform the start function
1029 * @tcw: transport-command word to be started
1030 * @lpm: mask of paths to use
1031 * @key: storage key to use for storage access
1033 * Start the tcw on the given subchannel. Return zero on success, non-zero
1036 int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key)
1039 union orb *orb = &to_io_private(sch)->orb;
1041 memset(orb, 0, sizeof(union orb));
1042 orb->tm.intparm = (u32) (addr_t) sch;
1043 orb->tm.key = key >> 4;
1045 orb->tm.lpm = lpm ? lpm : sch->lpm;
1046 orb->tm.tcw = (u32) (addr_t) tcw;
1047 cc = ssch(sch->schid, orb);
1055 return cio_start_handle_notoper(sch, lpm);
1058 EXPORT_SYMBOL_GPL(cio_tm_start_key);
1061 * cio_tm_intrg - perform interrogate function
1062 * @sch - subchannel on which to perform the interrogate function
1064 * If the specified subchannel is running in transport-mode, perform the
1065 * interrogate function. Return zero on success, non-zero otherwie.
1067 int cio_tm_intrg(struct subchannel *sch)
1071 if (!to_io_private(sch)->orb.tm.b)
1073 cc = xsch(sch->schid);
1084 EXPORT_SYMBOL_GPL(cio_tm_intrg);