2 * drivers/s390/cio/cio.c
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 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/slab.h>
15 #include <linux/device.h>
16 #include <linux/kernel_stat.h>
17 #include <linux/interrupt.h>
19 #include <asm/delay.h>
21 #include <asm/irq_regs.h>
22 #include <asm/setup.h>
23 #include <asm/reset.h>
25 #include <asm/chpid.h>
33 #include "blacklist.h"
34 #include "cio_debug.h"
36 #include "../s390mach.h"
38 debug_info_t *cio_debug_msg_id;
39 debug_info_t *cio_debug_trace_id;
40 debug_info_t *cio_debug_crw_id;
43 * Function: cio_debug_init
44 * Initializes three debug logs for common I/O:
45 * - cio_msg logs generic cio messages
46 * - cio_trace logs the calling of different functions
47 * - cio_crw logs machine check related cio messages
49 static int __init cio_debug_init(void)
51 cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long));
52 if (!cio_debug_msg_id)
54 debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
55 debug_set_level(cio_debug_msg_id, 2);
56 cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16);
57 if (!cio_debug_trace_id)
59 debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
60 debug_set_level(cio_debug_trace_id, 2);
61 cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long));
62 if (!cio_debug_crw_id)
64 debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
65 debug_set_level(cio_debug_crw_id, 4);
70 debug_unregister(cio_debug_msg_id);
71 if (cio_debug_trace_id)
72 debug_unregister(cio_debug_trace_id);
74 debug_unregister(cio_debug_crw_id);
75 printk(KERN_WARNING"cio: could not initialize debugging\n");
79 arch_initcall (cio_debug_init);
82 cio_set_options (struct subchannel *sch, int flags)
84 sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0;
85 sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0;
86 sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0;
90 /* FIXME: who wants to use this? */
92 cio_get_options (struct subchannel *sch)
97 if (sch->options.suspend)
98 flags |= DOIO_ALLOW_SUSPEND;
99 if (sch->options.prefetch)
100 flags |= DOIO_DENY_PREFETCH;
101 if (sch->options.inter)
102 flags |= DOIO_SUPPRESS_INTER;
107 * Use tpi to get a pending interrupt, call the interrupt handler and
108 * return a pointer to the subchannel structure.
113 struct tpi_info *tpi_info;
114 struct subchannel *sch;
117 tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
120 irb = (struct irb *) __LC_IRB;
121 /* Store interrupt response block to lowcore. */
122 if (tsch (tpi_info->schid, irb) != 0)
123 /* Not status pending or not operational. */
125 sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
130 spin_lock(sch->lock);
131 memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw));
132 if (sch->driver && sch->driver->irq)
133 sch->driver->irq(sch);
134 spin_unlock(sch->lock);
141 cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
150 stsch (sch->schid, &sch->schib);
152 CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
153 "subchannel 0.%x.%04x!\n", sch->schid.ssid,
155 sprintf(dbf_text, "no%s", sch->dev.bus_id);
156 CIO_TRACE_EVENT(0, dbf_text);
157 CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
159 return (sch->lpm ? -EACCES : -ENODEV);
163 cio_start_key (struct subchannel *sch, /* subchannel structure */
164 struct ccw1 * cpa, /* logical channel prog addr */
165 __u8 lpm, /* logical path mask */
166 __u8 key) /* storage key */
172 CIO_TRACE_EVENT(4, "stIO");
173 CIO_TRACE_EVENT(4, sch->dev.bus_id);
175 orb = &to_io_private(sch)->orb;
176 /* sch is always under 2G. */
177 orb->intparm = (u32)(addr_t)sch;
180 orb->pfch = sch->options.prefetch == 0;
181 orb->spnd = sch->options.suspend;
182 orb->ssic = sch->options.suspend && sch->options.inter;
183 orb->lpm = (lpm != 0) ? lpm : sch->lpm;
186 * for 64 bit we always support 64 bit IDAWs with 4k page size only
192 /* issue "Start Subchannel" */
193 orb->cpa = (__u32) __pa(cpa);
194 ccode = ssch(sch->schid, orb);
196 /* process condition code */
197 sprintf(dbf_txt, "ccode:%d", ccode);
198 CIO_TRACE_EVENT(4, dbf_txt);
203 * initialize device status information
205 sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
207 case 1: /* status pending */
210 default: /* device/path not operational */
211 return cio_start_handle_notoper(sch, lpm);
216 cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
218 return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
222 * resume suspended I/O operation
225 cio_resume (struct subchannel *sch)
230 CIO_TRACE_EVENT (4, "resIO");
231 CIO_TRACE_EVENT (4, sch->dev.bus_id);
233 ccode = rsch (sch->schid);
235 sprintf (dbf_txt, "ccode:%d", ccode);
236 CIO_TRACE_EVENT (4, dbf_txt);
240 sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;
248 * useless to wait for request completion
249 * as device is no longer operational !
259 cio_halt(struct subchannel *sch)
267 CIO_TRACE_EVENT (2, "haltIO");
268 CIO_TRACE_EVENT (2, sch->dev.bus_id);
271 * Issue "Halt subchannel" and process condition code
273 ccode = hsch (sch->schid);
275 sprintf (dbf_txt, "ccode:%d", ccode);
276 CIO_TRACE_EVENT (2, dbf_txt);
280 sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
282 case 1: /* status pending */
285 default: /* device not operational */
291 * Clear I/O operation
294 cio_clear(struct subchannel *sch)
302 CIO_TRACE_EVENT (2, "clearIO");
303 CIO_TRACE_EVENT (2, sch->dev.bus_id);
306 * Issue "Clear subchannel" and process condition code
308 ccode = csch (sch->schid);
310 sprintf (dbf_txt, "ccode:%d", ccode);
311 CIO_TRACE_EVENT (2, dbf_txt);
315 sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;
317 default: /* device not operational */
323 * Function: cio_cancel
324 * Issues a "Cancel Subchannel" on the specified subchannel
325 * Note: We don't need any fancy intparms and flags here
326 * since xsch is executed synchronously.
327 * Only for common I/O internal use as for now.
330 cio_cancel (struct subchannel *sch)
338 CIO_TRACE_EVENT (2, "cancelIO");
339 CIO_TRACE_EVENT (2, sch->dev.bus_id);
341 ccode = xsch (sch->schid);
343 sprintf (dbf_txt, "ccode:%d", ccode);
344 CIO_TRACE_EVENT (2, dbf_txt);
347 case 0: /* success */
348 /* Update information in scsw. */
349 stsch (sch->schid, &sch->schib);
351 case 1: /* status pending */
353 case 2: /* not applicable */
355 default: /* not oper */
361 * Function: cio_modify
362 * Issues a "Modify Subchannel" on the specified subchannel
365 cio_modify (struct subchannel *sch)
367 int ccode, retry, ret;
370 for (retry = 0; retry < 5; retry++) {
371 ccode = msch_err (sch->schid, &sch->schib);
372 if (ccode < 0) /* -EIO if msch gets a program check. */
375 case 0: /* successfull */
377 case 1: /* status pending */
380 udelay (100); /* allow for recovery */
383 case 3: /* not operational */
391 * cio_enable_subchannel - enable a subchannel.
392 * @sch: subchannel to be enabled
393 * @intparm: interruption parameter to set
395 int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
402 CIO_TRACE_EVENT (2, "ensch");
403 CIO_TRACE_EVENT (2, sch->dev.bus_id);
405 if (sch_is_pseudo_sch(sch))
407 ccode = stsch (sch->schid, &sch->schib);
411 for (retry = 5, ret = 0; retry > 0; retry--) {
412 sch->schib.pmcw.ena = 1;
413 sch->schib.pmcw.isc = sch->isc;
414 sch->schib.pmcw.intparm = intparm;
415 ret = cio_modify(sch);
420 * Got a program check in cio_modify. Try without
421 * the concurrent sense bit the next time.
423 sch->schib.pmcw.csense = 0;
425 stsch (sch->schid, &sch->schib);
426 if (sch->schib.pmcw.ena)
431 if (tsch(sch->schid, &irb) != 0)
435 sprintf (dbf_txt, "ret:%d", ret);
436 CIO_TRACE_EVENT (2, dbf_txt);
439 EXPORT_SYMBOL_GPL(cio_enable_subchannel);
442 * cio_disable_subchannel - disable a subchannel.
443 * @sch: subchannel to disable
445 int cio_disable_subchannel(struct subchannel *sch)
452 CIO_TRACE_EVENT (2, "dissch");
453 CIO_TRACE_EVENT (2, sch->dev.bus_id);
455 if (sch_is_pseudo_sch(sch))
457 ccode = stsch (sch->schid, &sch->schib);
458 if (ccode == 3) /* Not operational. */
461 if (scsw_actl(&sch->schib.scsw) != 0)
463 * the disable function must not be called while there are
464 * requests pending for completion !
468 for (retry = 5, ret = 0; retry > 0; retry--) {
469 sch->schib.pmcw.ena = 0;
470 ret = cio_modify(sch);
475 * The subchannel is busy or status pending.
476 * We'll disable when the next interrupt was delivered
477 * via the state machine.
481 stsch (sch->schid, &sch->schib);
482 if (!sch->schib.pmcw.ena)
486 sprintf (dbf_txt, "ret:%d", ret);
487 CIO_TRACE_EVENT (2, dbf_txt);
490 EXPORT_SYMBOL_GPL(cio_disable_subchannel);
492 int cio_create_sch_lock(struct subchannel *sch)
494 sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
497 spin_lock_init(sch->lock);
501 static int cio_check_devno_blacklisted(struct subchannel *sch)
503 if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) {
505 * This device must not be known to Linux. So we simply
506 * say that there is no device and return ENODEV.
508 CIO_MSG_EVENT(6, "Blacklisted device detected "
509 "at devno %04X, subchannel set %x\n",
510 sch->schib.pmcw.dev, sch->schid.ssid);
516 static int cio_validate_io_subchannel(struct subchannel *sch)
518 /* Initialization for io subchannels. */
519 if (!css_sch_is_valid(&sch->schib))
522 /* Devno is valid. */
523 return cio_check_devno_blacklisted(sch);
526 static int cio_validate_msg_subchannel(struct subchannel *sch)
528 /* Initialization for message subchannels. */
529 if (!css_sch_is_valid(&sch->schib))
532 /* Devno is valid. */
533 return cio_check_devno_blacklisted(sch);
537 * cio_validate_subchannel - basic validation of subchannel
538 * @sch: subchannel structure to be filled out
539 * @schid: subchannel id
541 * Find out subchannel type and initialize struct subchannel.
544 * -ENXIO for non-defined subchannels
545 * -ENODEV for invalid subchannels or blacklisted devices
546 * -EIO for subchannels in an invalid subchannel set
548 int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid)
554 sprintf(dbf_txt, "valsch%x", schid.sch_no);
555 CIO_TRACE_EVENT(4, dbf_txt);
557 /* Nuke all fields. */
558 memset(sch, 0, sizeof(struct subchannel));
561 if (cio_is_console(schid)) {
562 sch->lock = cio_get_console_lock();
564 err = cio_create_sch_lock(sch);
568 mutex_init(&sch->reg_mutex);
569 /* Set a name for the subchannel */
570 snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid,
574 * The first subchannel that is not-operational (ccode==3)
575 * indicates that there aren't any more devices available.
576 * If stsch gets an exception, it means the current subchannel set
579 ccode = stsch_err (schid, &sch->schib);
581 err = (ccode == 3) ? -ENXIO : ccode;
584 /* Copy subchannel type from path management control word. */
585 sch->st = sch->schib.pmcw.st;
588 case SUBCHANNEL_TYPE_IO:
589 err = cio_validate_io_subchannel(sch);
591 case SUBCHANNEL_TYPE_MSG:
592 err = cio_validate_msg_subchannel(sch);
600 CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
601 sch->schid.ssid, sch->schid.sch_no, sch->st);
604 if (!cio_is_console(schid))
611 * do_IRQ() handles all normal I/O device IRQ's (the special
612 * SMP cross-CPU interrupts have their own specific
617 do_IRQ (struct pt_regs *regs)
619 struct tpi_info *tpi_info;
620 struct subchannel *sch;
622 struct pt_regs *old_regs;
624 old_regs = set_irq_regs(regs);
627 if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
628 /* Serve timer interrupts first. */
629 clock_comparator_work();
631 * Get interrupt information from lowcore
633 tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
634 irb = (struct irb *) __LC_IRB;
636 kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++;
638 * Non I/O-subchannel thin interrupts are processed differently
640 if (tpi_info->adapter_IO == 1 &&
641 tpi_info->int_type == IO_INTERRUPT_TYPE) {
645 sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
647 /* Clear pending interrupt condition. */
648 tsch(tpi_info->schid, irb);
651 spin_lock(sch->lock);
652 /* Store interrupt response block to lowcore. */
653 if (tsch(tpi_info->schid, irb) == 0) {
654 /* Keep subchannel information word up to date. */
655 memcpy (&sch->schib.scsw, &irb->scsw,
657 /* Call interrupt handler if there is one. */
658 if (sch->driver && sch->driver->irq)
659 sch->driver->irq(sch);
661 spin_unlock(sch->lock);
663 * Are more interrupts pending?
664 * If so, the tpi instruction will update the lowcore
665 * to hold the info for the next interrupt.
666 * We don't do this for VM because a tpi drops the cpu
667 * out of the sie which costs more cycles than it saves.
669 } while (!MACHINE_IS_VM && tpi (NULL) != 0);
671 set_irq_regs(old_regs);
674 #ifdef CONFIG_CCW_CONSOLE
675 static struct subchannel console_subchannel;
676 static struct io_subchannel_private console_priv;
677 static int console_subchannel_in_use;
679 void *cio_get_console_priv(void)
681 return &console_priv;
685 * busy wait for the next interrupt on the console
687 void wait_cons_dev(void)
688 __releases(console_subchannel.lock)
689 __acquires(console_subchannel.lock)
691 unsigned long cr6 __attribute__ ((aligned (8)));
692 unsigned long save_cr6 __attribute__ ((aligned (8)));
695 * before entering the spinlock we may already have
696 * processed the interrupt on a different CPU...
698 if (!console_subchannel_in_use)
701 /* disable all but isc 1 (console device) */
702 __ctl_store (save_cr6, 6, 6);
704 __ctl_load (cr6, 6, 6);
707 spin_unlock(console_subchannel.lock);
710 spin_lock(console_subchannel.lock);
711 } while (console_subchannel.schib.scsw.cmd.actl != 0);
713 * restore previous isc value
715 __ctl_load (save_cr6, 6, 6);
719 cio_test_for_console(struct subchannel_id schid, void *data)
721 if (stsch_err(schid, &console_subchannel.schib) != 0)
723 if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) &&
724 console_subchannel.schib.pmcw.dnv &&
725 (console_subchannel.schib.pmcw.dev == console_devno)) {
726 console_irq = schid.sch_no;
727 return 1; /* found */
734 cio_get_console_sch_no(void)
736 struct subchannel_id schid;
738 init_subchannel_id(&schid);
739 if (console_irq != -1) {
740 /* VM provided us with the irq number of the console. */
741 schid.sch_no = console_irq;
742 if (stsch(schid, &console_subchannel.schib) != 0 ||
743 (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) ||
744 !console_subchannel.schib.pmcw.dnv)
746 console_devno = console_subchannel.schib.pmcw.dev;
747 } else if (console_devno != -1) {
748 /* At least the console device number is known. */
749 for_each_subchannel(cio_test_for_console, NULL);
750 if (console_irq == -1)
753 /* unlike in 2.4, we cannot autoprobe here, since
754 * the channel subsystem is not fully initialized.
755 * With some luck, the HWC console can take over */
756 printk(KERN_WARNING "cio: No ccw console found!\n");
763 cio_probe_console(void)
766 struct subchannel_id schid;
768 if (xchg(&console_subchannel_in_use, 1) != 0)
769 return ERR_PTR(-EBUSY);
770 sch_no = cio_get_console_sch_no();
772 console_subchannel_in_use = 0;
773 return ERR_PTR(-ENODEV);
775 memset(&console_subchannel, 0, sizeof(struct subchannel));
776 init_subchannel_id(&schid);
777 schid.sch_no = sch_no;
778 ret = cio_validate_subchannel(&console_subchannel, schid);
780 console_subchannel_in_use = 0;
781 return ERR_PTR(-ENODEV);
785 * enable console I/O-interrupt subclass 1
788 console_subchannel.schib.pmcw.isc = 1;
789 console_subchannel.schib.pmcw.intparm =
790 (u32)(addr_t)&console_subchannel;
791 ret = cio_modify(&console_subchannel);
793 console_subchannel_in_use = 0;
796 return &console_subchannel;
800 cio_release_console(void)
802 console_subchannel.schib.pmcw.intparm = 0;
803 cio_modify(&console_subchannel);
804 ctl_clear_bit(6, 30);
805 console_subchannel_in_use = 0;
808 /* Bah... hack to catch console special sausages. */
810 cio_is_console(struct subchannel_id schid)
812 if (!console_subchannel_in_use)
814 return schid_equal(&schid, &console_subchannel.schid);
818 cio_get_console_subchannel(void)
820 if (!console_subchannel_in_use)
822 return &console_subchannel;
827 __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
832 for (retry=0;retry<3;retry++) {
834 cc = msch(schid, schib);
836 return (cc==3?-ENODEV:-EBUSY);
838 if (!schib->pmcw.ena)
841 return -EBUSY; /* uhm... */
844 /* we can't use the normal udelay here, since it enables external interrupts */
846 static void udelay_reset(unsigned long usecs)
848 uint64_t start_cc, end_cc;
850 asm volatile ("STCK %0" : "=m" (start_cc));
853 asm volatile ("STCK %0" : "=m" (end_cc));
854 } while (((end_cc - start_cc)/4096) < usecs);
858 __clear_io_subchannel_easy(struct subchannel_id schid)
864 for (retry=0;retry<20;retry++) {
868 tsch(ti.schid, (struct irb *)__LC_IRB);
869 if (schid_equal(&ti.schid, &schid))
877 static int pgm_check_occured;
879 static void cio_reset_pgm_check_handler(void)
881 pgm_check_occured = 1;
884 static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr)
888 pgm_check_occured = 0;
889 s390_base_pgm_handler_fn = cio_reset_pgm_check_handler;
890 rc = stsch(schid, addr);
891 s390_base_pgm_handler_fn = NULL;
893 /* The program check handler could have changed pgm_check_occured. */
896 if (pgm_check_occured)
902 static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
906 if (stsch_reset(schid, &schib))
910 switch(__disable_subchannel_easy(schid, &schib)) {
914 default: /* -EBUSY */
915 switch (schib.pmcw.st) {
916 case SUBCHANNEL_TYPE_IO:
917 if (__clear_io_subchannel_easy(schid))
918 goto out; /* give up... */
921 /* No default clear strategy */
924 stsch(schid, &schib);
925 __disable_subchannel_easy(schid, &schib);
931 static atomic_t chpid_reset_count;
933 static void s390_reset_chpids_mcck_handler(void)
938 /* Check for pending channel report word. */
939 mci = (struct mci *)&S390_lowcore.mcck_interruption_code;
942 /* Process channel report words. */
943 while (stcrw(&crw) == 0) {
944 /* Check for responses to RCHP. */
945 if (crw.slct && crw.rsc == CRW_RSC_CPATH)
946 atomic_dec(&chpid_reset_count);
950 #define RCHP_TIMEOUT (30 * USEC_PER_SEC)
951 static void css_reset(void)
954 unsigned long long timeout;
957 /* Reset subchannels. */
958 for_each_subchannel(__shutdown_subchannel_easy, NULL);
959 /* Reset channel paths. */
960 s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler;
961 /* Enable channel report machine checks. */
962 __ctl_set_bit(14, 28);
963 /* Temporarily reenable machine checks. */
966 for (i = 0; i <= __MAX_CHPID; i++) {
969 if ((ret == 0) || (ret == 2))
971 * rchp either succeeded, or another rchp is already
972 * in progress. In either case, we'll get a crw.
974 atomic_inc(&chpid_reset_count);
976 /* Wait for machine check for all channel paths. */
977 timeout = get_clock() + (RCHP_TIMEOUT << 12);
978 while (atomic_read(&chpid_reset_count) != 0) {
979 if (get_clock() > timeout)
983 /* Disable machine checks again. */
984 local_mcck_disable();
985 /* Disable channel report machine checks. */
986 __ctl_clear_bit(14, 28);
987 s390_base_mcck_handler_fn = NULL;
990 static struct reset_call css_reset_call = {
994 static int __init init_css_reset_call(void)
996 atomic_set(&chpid_reset_count, 0);
997 register_reset_call(&css_reset_call);
1001 arch_initcall(init_css_reset_call);
1003 struct sch_match_id {
1004 struct subchannel_id schid;
1005 struct ccw_dev_id devid;
1009 static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
1012 struct sch_match_id *match_id = data;
1014 if (stsch_reset(schid, &schib))
1016 if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
1017 (schib.pmcw.dev == match_id->devid.devno) &&
1018 (schid.ssid == match_id->devid.ssid)) {
1019 match_id->schid = schid;
1026 static int reipl_find_schid(struct ccw_dev_id *devid,
1027 struct subchannel_id *schid)
1029 struct sch_match_id match_id;
1031 match_id.devid = *devid;
1032 match_id.rc = -ENODEV;
1033 for_each_subchannel(__reipl_subchannel_match, &match_id);
1034 if (match_id.rc == 0)
1035 *schid = match_id.schid;
1039 extern void do_reipl_asm(__u32 schid);
1041 /* Make sure all subchannels are quiet before we re-ipl an lpar. */
1042 void reipl_ccw_dev(struct ccw_dev_id *devid)
1044 struct subchannel_id schid;
1046 s390_reset_system();
1047 if (reipl_find_schid(devid, &schid) != 0)
1048 panic("IPL Device not found\n");
1049 do_reipl_asm(*((__u32*)&schid));
1052 int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
1054 struct subchannel_id schid;
1057 schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID;
1060 if (stsch(schid, &schib))
1062 if (schib.pmcw.st != SUBCHANNEL_TYPE_IO)
1064 if (!schib.pmcw.dnv)
1066 iplinfo->devno = schib.pmcw.dev;
1067 iplinfo->is_qdio = schib.pmcw.qf;