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>
35 #include "blacklist.h"
36 #include "cio_debug.h"
38 #include "../s390mach.h"
40 debug_info_t *cio_debug_msg_id;
41 debug_info_t *cio_debug_trace_id;
42 debug_info_t *cio_debug_crw_id;
45 * Function: cio_debug_init
46 * Initializes three debug logs for common I/O:
47 * - cio_msg logs generic cio messages
48 * - cio_trace logs the calling of different functions
49 * - cio_crw logs machine check related cio messages
51 static int __init cio_debug_init(void)
53 cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long));
54 if (!cio_debug_msg_id)
56 debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
57 debug_set_level(cio_debug_msg_id, 2);
58 cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16);
59 if (!cio_debug_trace_id)
61 debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
62 debug_set_level(cio_debug_trace_id, 2);
63 cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long));
64 if (!cio_debug_crw_id)
66 debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
67 debug_set_level(cio_debug_crw_id, 4);
72 debug_unregister(cio_debug_msg_id);
73 if (cio_debug_trace_id)
74 debug_unregister(cio_debug_trace_id);
76 debug_unregister(cio_debug_crw_id);
80 arch_initcall (cio_debug_init);
83 cio_set_options (struct subchannel *sch, int flags)
85 sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0;
86 sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0;
87 sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0;
91 /* FIXME: who wants to use this? */
93 cio_get_options (struct subchannel *sch)
98 if (sch->options.suspend)
99 flags |= DOIO_ALLOW_SUSPEND;
100 if (sch->options.prefetch)
101 flags |= DOIO_DENY_PREFETCH;
102 if (sch->options.inter)
103 flags |= DOIO_SUPPRESS_INTER;
108 * Use tpi to get a pending interrupt, call the interrupt handler and
109 * return a pointer to the subchannel structure.
114 struct tpi_info *tpi_info;
115 struct subchannel *sch;
118 tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
121 irb = (struct irb *) __LC_IRB;
122 /* Store interrupt response block to lowcore. */
123 if (tsch (tpi_info->schid, irb) != 0)
124 /* Not status pending or not operational. */
126 sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
131 spin_lock(sch->lock);
132 memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw));
133 if (sch->driver && sch->driver->irq)
134 sch->driver->irq(sch);
135 spin_unlock(sch->lock);
142 cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
151 stsch (sch->schid, &sch->schib);
153 CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
154 "subchannel 0.%x.%04x!\n", sch->schid.ssid,
156 sprintf(dbf_text, "no%s", dev_name(&sch->dev));
157 CIO_TRACE_EVENT(0, dbf_text);
158 CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
160 return (sch->lpm ? -EACCES : -ENODEV);
164 cio_start_key (struct subchannel *sch, /* subchannel structure */
165 struct ccw1 * cpa, /* logical channel prog addr */
166 __u8 lpm, /* logical path mask */
167 __u8 key) /* storage key */
173 CIO_TRACE_EVENT(4, "stIO");
174 CIO_TRACE_EVENT(4, dev_name(&sch->dev));
176 orb = &to_io_private(sch)->orb;
177 memset(orb, 0, sizeof(union orb));
178 /* sch is always under 2G. */
179 orb->cmd.intparm = (u32)(addr_t)sch;
182 orb->cmd.pfch = sch->options.prefetch == 0;
183 orb->cmd.spnd = sch->options.suspend;
184 orb->cmd.ssic = sch->options.suspend && sch->options.inter;
185 orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;
188 * for 64 bit we always support 64 bit IDAWs with 4k page size only
193 orb->cmd.key = key >> 4;
194 /* issue "Start Subchannel" */
195 orb->cmd.cpa = (__u32) __pa(cpa);
196 ccode = ssch(sch->schid, orb);
198 /* process condition code */
199 sprintf(dbf_txt, "ccode:%d", ccode);
200 CIO_TRACE_EVENT(4, dbf_txt);
205 * initialize device status information
207 sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
209 case 1: /* status pending */
212 case 3: /* device/path not operational */
213 return cio_start_handle_notoper(sch, lpm);
220 cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
222 return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
226 * resume suspended I/O operation
229 cio_resume (struct subchannel *sch)
234 CIO_TRACE_EVENT (4, "resIO");
235 CIO_TRACE_EVENT(4, dev_name(&sch->dev));
237 ccode = rsch (sch->schid);
239 sprintf (dbf_txt, "ccode:%d", ccode);
240 CIO_TRACE_EVENT (4, dbf_txt);
244 sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;
252 * useless to wait for request completion
253 * as device is no longer operational !
263 cio_halt(struct subchannel *sch)
271 CIO_TRACE_EVENT (2, "haltIO");
272 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
275 * Issue "Halt subchannel" and process condition code
277 ccode = hsch (sch->schid);
279 sprintf (dbf_txt, "ccode:%d", ccode);
280 CIO_TRACE_EVENT (2, dbf_txt);
284 sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
286 case 1: /* status pending */
289 default: /* device not operational */
295 * Clear I/O operation
298 cio_clear(struct subchannel *sch)
306 CIO_TRACE_EVENT (2, "clearIO");
307 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
310 * Issue "Clear subchannel" and process condition code
312 ccode = csch (sch->schid);
314 sprintf (dbf_txt, "ccode:%d", ccode);
315 CIO_TRACE_EVENT (2, dbf_txt);
319 sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;
321 default: /* device not operational */
327 * Function: cio_cancel
328 * Issues a "Cancel Subchannel" on the specified subchannel
329 * Note: We don't need any fancy intparms and flags here
330 * since xsch is executed synchronously.
331 * Only for common I/O internal use as for now.
334 cio_cancel (struct subchannel *sch)
342 CIO_TRACE_EVENT (2, "cancelIO");
343 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
345 ccode = xsch (sch->schid);
347 sprintf (dbf_txt, "ccode:%d", ccode);
348 CIO_TRACE_EVENT (2, dbf_txt);
351 case 0: /* success */
352 /* Update information in scsw. */
353 stsch (sch->schid, &sch->schib);
355 case 1: /* status pending */
357 case 2: /* not applicable */
359 default: /* not oper */
365 * Function: cio_modify
366 * Issues a "Modify Subchannel" on the specified subchannel
369 cio_modify (struct subchannel *sch)
371 int ccode, retry, ret;
374 for (retry = 0; retry < 5; retry++) {
375 ccode = msch_err (sch->schid, &sch->schib);
376 if (ccode < 0) /* -EIO if msch gets a program check. */
379 case 0: /* successfull */
381 case 1: /* status pending */
384 udelay (100); /* allow for recovery */
387 case 3: /* not operational */
395 * cio_enable_subchannel - enable a subchannel.
396 * @sch: subchannel to be enabled
397 * @intparm: interruption parameter to set
399 int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
406 CIO_TRACE_EVENT (2, "ensch");
407 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
409 if (sch_is_pseudo_sch(sch))
411 ccode = stsch (sch->schid, &sch->schib);
415 for (retry = 5, ret = 0; retry > 0; retry--) {
416 sch->schib.pmcw.ena = 1;
417 sch->schib.pmcw.isc = sch->isc;
418 sch->schib.pmcw.intparm = intparm;
419 ret = cio_modify(sch);
424 * Got a program check in cio_modify. Try without
425 * the concurrent sense bit the next time.
427 sch->schib.pmcw.csense = 0;
429 stsch (sch->schid, &sch->schib);
430 if (sch->schib.pmcw.ena)
435 if (tsch(sch->schid, &irb) != 0)
439 sprintf (dbf_txt, "ret:%d", ret);
440 CIO_TRACE_EVENT (2, dbf_txt);
443 EXPORT_SYMBOL_GPL(cio_enable_subchannel);
446 * cio_disable_subchannel - disable a subchannel.
447 * @sch: subchannel to disable
449 int cio_disable_subchannel(struct subchannel *sch)
456 CIO_TRACE_EVENT (2, "dissch");
457 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
459 if (sch_is_pseudo_sch(sch))
461 ccode = stsch (sch->schid, &sch->schib);
462 if (ccode == 3) /* Not operational. */
465 if (scsw_actl(&sch->schib.scsw) != 0)
467 * the disable function must not be called while there are
468 * requests pending for completion !
472 for (retry = 5, ret = 0; retry > 0; retry--) {
473 sch->schib.pmcw.ena = 0;
474 ret = cio_modify(sch);
479 * The subchannel is busy or status pending.
480 * We'll disable when the next interrupt was delivered
481 * via the state machine.
485 stsch (sch->schid, &sch->schib);
486 if (!sch->schib.pmcw.ena)
490 sprintf (dbf_txt, "ret:%d", ret);
491 CIO_TRACE_EVENT (2, dbf_txt);
494 EXPORT_SYMBOL_GPL(cio_disable_subchannel);
496 int cio_create_sch_lock(struct subchannel *sch)
498 sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
501 spin_lock_init(sch->lock);
505 static int cio_check_devno_blacklisted(struct subchannel *sch)
507 if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) {
509 * This device must not be known to Linux. So we simply
510 * say that there is no device and return ENODEV.
512 CIO_MSG_EVENT(6, "Blacklisted device detected "
513 "at devno %04X, subchannel set %x\n",
514 sch->schib.pmcw.dev, sch->schid.ssid);
520 static int cio_validate_io_subchannel(struct subchannel *sch)
522 /* Initialization for io subchannels. */
523 if (!css_sch_is_valid(&sch->schib))
526 /* Devno is valid. */
527 return cio_check_devno_blacklisted(sch);
530 static int cio_validate_msg_subchannel(struct subchannel *sch)
532 /* Initialization for message subchannels. */
533 if (!css_sch_is_valid(&sch->schib))
536 /* Devno is valid. */
537 return cio_check_devno_blacklisted(sch);
541 * cio_validate_subchannel - basic validation of subchannel
542 * @sch: subchannel structure to be filled out
543 * @schid: subchannel id
545 * Find out subchannel type and initialize struct subchannel.
548 * -ENXIO for non-defined subchannels
549 * -ENODEV for invalid subchannels or blacklisted devices
550 * -EIO for subchannels in an invalid subchannel set
552 int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid)
558 sprintf(dbf_txt, "valsch%x", schid.sch_no);
559 CIO_TRACE_EVENT(4, dbf_txt);
561 /* Nuke all fields. */
562 memset(sch, 0, sizeof(struct subchannel));
565 if (cio_is_console(schid)) {
566 sch->lock = cio_get_console_lock();
568 err = cio_create_sch_lock(sch);
572 mutex_init(&sch->reg_mutex);
573 /* Set a name for the subchannel */
574 if (cio_is_console(schid))
575 sch->dev.init_name = cio_get_console_sch_name(schid);
577 dev_set_name(&sch->dev, "0.%x.%04x", schid.ssid, schid.sch_no);
580 * The first subchannel that is not-operational (ccode==3)
581 * indicates that there aren't any more devices available.
582 * If stsch gets an exception, it means the current subchannel set
585 ccode = stsch_err (schid, &sch->schib);
587 err = (ccode == 3) ? -ENXIO : ccode;
590 /* Copy subchannel type from path management control word. */
591 sch->st = sch->schib.pmcw.st;
594 case SUBCHANNEL_TYPE_IO:
595 err = cio_validate_io_subchannel(sch);
597 case SUBCHANNEL_TYPE_MSG:
598 err = cio_validate_msg_subchannel(sch);
606 CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
607 sch->schid.ssid, sch->schid.sch_no, sch->st);
610 if (!cio_is_console(schid))
617 * do_IRQ() handles all normal I/O device IRQ's (the special
618 * SMP cross-CPU interrupts have their own specific
623 do_IRQ (struct pt_regs *regs)
625 struct tpi_info *tpi_info;
626 struct subchannel *sch;
628 struct pt_regs *old_regs;
630 old_regs = set_irq_regs(regs);
633 if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
634 /* Serve timer interrupts first. */
635 clock_comparator_work();
637 * Get interrupt information from lowcore
639 tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
640 irb = (struct irb *) __LC_IRB;
642 kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++;
644 * Non I/O-subchannel thin interrupts are processed differently
646 if (tpi_info->adapter_IO == 1 &&
647 tpi_info->int_type == IO_INTERRUPT_TYPE) {
648 do_adapter_IO(tpi_info->isc);
651 sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
653 /* Clear pending interrupt condition. */
654 tsch(tpi_info->schid, irb);
657 spin_lock(sch->lock);
658 /* Store interrupt response block to lowcore. */
659 if (tsch(tpi_info->schid, irb) == 0) {
660 /* Keep subchannel information word up to date. */
661 memcpy (&sch->schib.scsw, &irb->scsw,
663 /* Call interrupt handler if there is one. */
664 if (sch->driver && sch->driver->irq)
665 sch->driver->irq(sch);
667 spin_unlock(sch->lock);
669 * Are more interrupts pending?
670 * If so, the tpi instruction will update the lowcore
671 * to hold the info for the next interrupt.
672 * We don't do this for VM because a tpi drops the cpu
673 * out of the sie which costs more cycles than it saves.
675 } while (!MACHINE_IS_VM && tpi (NULL) != 0);
677 set_irq_regs(old_regs);
680 #ifdef CONFIG_CCW_CONSOLE
681 static struct subchannel console_subchannel;
682 static char console_sch_name[10] = "0.x.xxxx";
683 static struct io_subchannel_private console_priv;
684 static int console_subchannel_in_use;
686 void *cio_get_console_priv(void)
688 return &console_priv;
692 * busy wait for the next interrupt on the console
694 void wait_cons_dev(void)
695 __releases(console_subchannel.lock)
696 __acquires(console_subchannel.lock)
698 unsigned long cr6 __attribute__ ((aligned (8)));
699 unsigned long save_cr6 __attribute__ ((aligned (8)));
702 * before entering the spinlock we may already have
703 * processed the interrupt on a different CPU...
705 if (!console_subchannel_in_use)
708 /* disable all but the console isc */
709 __ctl_store (save_cr6, 6, 6);
710 cr6 = 1UL << (31 - CONSOLE_ISC);
711 __ctl_load (cr6, 6, 6);
714 spin_unlock(console_subchannel.lock);
717 spin_lock(console_subchannel.lock);
718 } while (console_subchannel.schib.scsw.cmd.actl != 0);
720 * restore previous isc value
722 __ctl_load (save_cr6, 6, 6);
726 cio_test_for_console(struct subchannel_id schid, void *data)
728 if (stsch_err(schid, &console_subchannel.schib) != 0)
730 if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) &&
731 console_subchannel.schib.pmcw.dnv &&
732 (console_subchannel.schib.pmcw.dev == console_devno)) {
733 console_irq = schid.sch_no;
734 return 1; /* found */
741 cio_get_console_sch_no(void)
743 struct subchannel_id schid;
745 init_subchannel_id(&schid);
746 if (console_irq != -1) {
747 /* VM provided us with the irq number of the console. */
748 schid.sch_no = console_irq;
749 if (stsch(schid, &console_subchannel.schib) != 0 ||
750 (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) ||
751 !console_subchannel.schib.pmcw.dnv)
753 console_devno = console_subchannel.schib.pmcw.dev;
754 } else if (console_devno != -1) {
755 /* At least the console device number is known. */
756 for_each_subchannel(cio_test_for_console, NULL);
757 if (console_irq == -1)
760 /* unlike in 2.4, we cannot autoprobe here, since
761 * the channel subsystem is not fully initialized.
762 * With some luck, the HWC console can take over */
769 cio_probe_console(void)
772 struct subchannel_id schid;
774 if (xchg(&console_subchannel_in_use, 1) != 0)
775 return ERR_PTR(-EBUSY);
776 sch_no = cio_get_console_sch_no();
778 console_subchannel_in_use = 0;
779 printk(KERN_WARNING "cio: No ccw console found!\n");
780 return ERR_PTR(-ENODEV);
782 memset(&console_subchannel, 0, sizeof(struct subchannel));
783 init_subchannel_id(&schid);
784 schid.sch_no = sch_no;
785 ret = cio_validate_subchannel(&console_subchannel, schid);
787 console_subchannel_in_use = 0;
788 return ERR_PTR(-ENODEV);
792 * enable console I/O-interrupt subclass
794 isc_register(CONSOLE_ISC);
795 console_subchannel.schib.pmcw.isc = CONSOLE_ISC;
796 console_subchannel.schib.pmcw.intparm =
797 (u32)(addr_t)&console_subchannel;
798 ret = cio_modify(&console_subchannel);
800 isc_unregister(CONSOLE_ISC);
801 console_subchannel_in_use = 0;
804 return &console_subchannel;
808 cio_release_console(void)
810 console_subchannel.schib.pmcw.intparm = 0;
811 cio_modify(&console_subchannel);
812 isc_unregister(CONSOLE_ISC);
813 console_subchannel_in_use = 0;
816 /* Bah... hack to catch console special sausages. */
818 cio_is_console(struct subchannel_id schid)
820 if (!console_subchannel_in_use)
822 return schid_equal(&schid, &console_subchannel.schid);
826 cio_get_console_subchannel(void)
828 if (!console_subchannel_in_use)
830 return &console_subchannel;
833 const char *cio_get_console_sch_name(struct subchannel_id schid)
835 snprintf(console_sch_name, 10, "0.%x.%04x", schid.ssid, schid.sch_no);
836 return (const char *)console_sch_name;
841 __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
846 for (retry=0;retry<3;retry++) {
848 cc = msch(schid, schib);
850 return (cc==3?-ENODEV:-EBUSY);
852 if (!schib->pmcw.ena)
855 return -EBUSY; /* uhm... */
858 /* we can't use the normal udelay here, since it enables external interrupts */
860 static void udelay_reset(unsigned long usecs)
862 uint64_t start_cc, end_cc;
864 asm volatile ("STCK %0" : "=m" (start_cc));
867 asm volatile ("STCK %0" : "=m" (end_cc));
868 } while (((end_cc - start_cc)/4096) < usecs);
872 __clear_io_subchannel_easy(struct subchannel_id schid)
878 for (retry=0;retry<20;retry++) {
882 tsch(ti.schid, (struct irb *)__LC_IRB);
883 if (schid_equal(&ti.schid, &schid))
891 static void __clear_chsc_subchannel_easy(void)
893 /* It seems we can only wait for a bit here :/ */
897 static int pgm_check_occured;
899 static void cio_reset_pgm_check_handler(void)
901 pgm_check_occured = 1;
904 static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr)
908 pgm_check_occured = 0;
909 s390_base_pgm_handler_fn = cio_reset_pgm_check_handler;
910 rc = stsch(schid, addr);
911 s390_base_pgm_handler_fn = NULL;
913 /* The program check handler could have changed pgm_check_occured. */
916 if (pgm_check_occured)
922 static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
926 if (stsch_reset(schid, &schib))
930 switch(__disable_subchannel_easy(schid, &schib)) {
934 default: /* -EBUSY */
935 switch (schib.pmcw.st) {
936 case SUBCHANNEL_TYPE_IO:
937 if (__clear_io_subchannel_easy(schid))
938 goto out; /* give up... */
940 case SUBCHANNEL_TYPE_CHSC:
941 __clear_chsc_subchannel_easy();
944 /* No default clear strategy */
947 stsch(schid, &schib);
948 __disable_subchannel_easy(schid, &schib);
954 static atomic_t chpid_reset_count;
956 static void s390_reset_chpids_mcck_handler(void)
961 /* Check for pending channel report word. */
962 mci = (struct mci *)&S390_lowcore.mcck_interruption_code;
965 /* Process channel report words. */
966 while (stcrw(&crw) == 0) {
967 /* Check for responses to RCHP. */
968 if (crw.slct && crw.rsc == CRW_RSC_CPATH)
969 atomic_dec(&chpid_reset_count);
973 #define RCHP_TIMEOUT (30 * USEC_PER_SEC)
974 static void css_reset(void)
977 unsigned long long timeout;
980 /* Reset subchannels. */
981 for_each_subchannel(__shutdown_subchannel_easy, NULL);
982 /* Reset channel paths. */
983 s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler;
984 /* Enable channel report machine checks. */
985 __ctl_set_bit(14, 28);
986 /* Temporarily reenable machine checks. */
989 for (i = 0; i <= __MAX_CHPID; i++) {
992 if ((ret == 0) || (ret == 2))
994 * rchp either succeeded, or another rchp is already
995 * in progress. In either case, we'll get a crw.
997 atomic_inc(&chpid_reset_count);
999 /* Wait for machine check for all channel paths. */
1000 timeout = get_clock() + (RCHP_TIMEOUT << 12);
1001 while (atomic_read(&chpid_reset_count) != 0) {
1002 if (get_clock() > timeout)
1006 /* Disable machine checks again. */
1007 local_mcck_disable();
1008 /* Disable channel report machine checks. */
1009 __ctl_clear_bit(14, 28);
1010 s390_base_mcck_handler_fn = NULL;
1013 static struct reset_call css_reset_call = {
1017 static int __init init_css_reset_call(void)
1019 atomic_set(&chpid_reset_count, 0);
1020 register_reset_call(&css_reset_call);
1024 arch_initcall(init_css_reset_call);
1026 struct sch_match_id {
1027 struct subchannel_id schid;
1028 struct ccw_dev_id devid;
1032 static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
1035 struct sch_match_id *match_id = data;
1037 if (stsch_reset(schid, &schib))
1039 if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
1040 (schib.pmcw.dev == match_id->devid.devno) &&
1041 (schid.ssid == match_id->devid.ssid)) {
1042 match_id->schid = schid;
1049 static int reipl_find_schid(struct ccw_dev_id *devid,
1050 struct subchannel_id *schid)
1052 struct sch_match_id match_id;
1054 match_id.devid = *devid;
1055 match_id.rc = -ENODEV;
1056 for_each_subchannel(__reipl_subchannel_match, &match_id);
1057 if (match_id.rc == 0)
1058 *schid = match_id.schid;
1062 extern void do_reipl_asm(__u32 schid);
1064 /* Make sure all subchannels are quiet before we re-ipl an lpar. */
1065 void reipl_ccw_dev(struct ccw_dev_id *devid)
1067 struct subchannel_id schid;
1069 s390_reset_system();
1070 if (reipl_find_schid(devid, &schid) != 0)
1071 panic("IPL Device not found\n");
1072 do_reipl_asm(*((__u32*)&schid));
1075 int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
1077 struct subchannel_id schid;
1080 schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID;
1083 if (stsch(schid, &schib))
1085 if (schib.pmcw.st != SUBCHANNEL_TYPE_IO)
1087 if (!schib.pmcw.dnv)
1089 iplinfo->devno = schib.pmcw.dev;
1090 iplinfo->is_qdio = schib.pmcw.qf;
1095 * cio_tm_start_key - perform start function
1096 * @sch: subchannel on which to perform the start function
1097 * @tcw: transport-command word to be started
1098 * @lpm: mask of paths to use
1099 * @key: storage key to use for storage access
1101 * Start the tcw on the given subchannel. Return zero on success, non-zero
1104 int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key)
1107 union orb *orb = &to_io_private(sch)->orb;
1109 memset(orb, 0, sizeof(union orb));
1110 orb->tm.intparm = (u32) (addr_t) sch;
1111 orb->tm.key = key >> 4;
1113 orb->tm.lpm = lpm ? lpm : sch->lpm;
1114 orb->tm.tcw = (u32) (addr_t) tcw;
1115 cc = ssch(sch->schid, orb);
1123 return cio_start_handle_notoper(sch, lpm);
1128 * cio_tm_intrg - perform interrogate function
1129 * @sch - subchannel on which to perform the interrogate function
1131 * If the specified subchannel is running in transport-mode, perform the
1132 * interrogate function. Return zero on success, non-zero otherwie.
1134 int cio_tm_intrg(struct subchannel *sch)
1138 if (!to_io_private(sch)->orb.tm.b)
1140 cc = xsch(sch->schid);