2 * drivers/s390/cio/cio.c
3 * S/390 common I/O routines -- low level i/o calls
5 * Copyright (C) IBM Corp. 1999,2006
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>
32 #include "blacklist.h"
33 #include "cio_debug.h"
35 #include "../s390mach.h"
37 debug_info_t
*cio_debug_msg_id
;
38 debug_info_t
*cio_debug_trace_id
;
39 debug_info_t
*cio_debug_crw_id
;
44 cio_setup (char *parm
)
46 if (!strcmp (parm
, "yes"))
48 else if (!strcmp (parm
, "no"))
51 printk(KERN_ERR
"cio: cio_setup: "
52 "invalid cio_msg parameter '%s'", parm
);
56 __setup ("cio_msg=", cio_setup
);
59 * Function: cio_debug_init
60 * Initializes three debug logs for common I/O:
61 * - cio_msg logs generic cio messages
62 * - cio_trace logs the calling of different functions
63 * - cio_crw logs machine check related cio messages
65 static int __init
cio_debug_init(void)
67 cio_debug_msg_id
= debug_register("cio_msg", 16, 4, 16 * sizeof(long));
68 if (!cio_debug_msg_id
)
70 debug_register_view(cio_debug_msg_id
, &debug_sprintf_view
);
71 debug_set_level(cio_debug_msg_id
, 2);
72 cio_debug_trace_id
= debug_register("cio_trace", 16, 4, 16);
73 if (!cio_debug_trace_id
)
75 debug_register_view(cio_debug_trace_id
, &debug_hex_ascii_view
);
76 debug_set_level(cio_debug_trace_id
, 2);
77 cio_debug_crw_id
= debug_register("cio_crw", 16, 4, 16 * sizeof(long));
78 if (!cio_debug_crw_id
)
80 debug_register_view(cio_debug_crw_id
, &debug_sprintf_view
);
81 debug_set_level(cio_debug_crw_id
, 4);
86 debug_unregister(cio_debug_msg_id
);
87 if (cio_debug_trace_id
)
88 debug_unregister(cio_debug_trace_id
);
90 debug_unregister(cio_debug_crw_id
);
91 printk(KERN_WARNING
"cio: could not initialize debugging\n");
95 arch_initcall (cio_debug_init
);
98 cio_set_options (struct subchannel
*sch
, int flags
)
100 sch
->options
.suspend
= (flags
& DOIO_ALLOW_SUSPEND
) != 0;
101 sch
->options
.prefetch
= (flags
& DOIO_DENY_PREFETCH
) != 0;
102 sch
->options
.inter
= (flags
& DOIO_SUPPRESS_INTER
) != 0;
106 /* FIXME: who wants to use this? */
108 cio_get_options (struct subchannel
*sch
)
113 if (sch
->options
.suspend
)
114 flags
|= DOIO_ALLOW_SUSPEND
;
115 if (sch
->options
.prefetch
)
116 flags
|= DOIO_DENY_PREFETCH
;
117 if (sch
->options
.inter
)
118 flags
|= DOIO_SUPPRESS_INTER
;
123 * Use tpi to get a pending interrupt, call the interrupt handler and
124 * return a pointer to the subchannel structure.
129 struct tpi_info
*tpi_info
;
130 struct subchannel
*sch
;
133 tpi_info
= (struct tpi_info
*) __LC_SUBCHANNEL_ID
;
136 irb
= (struct irb
*) __LC_IRB
;
137 /* Store interrupt response block to lowcore. */
138 if (tsch (tpi_info
->schid
, irb
) != 0)
139 /* Not status pending or not operational. */
141 sch
= (struct subchannel
*)(unsigned long)tpi_info
->intparm
;
146 spin_lock(sch
->lock
);
147 memcpy (&sch
->schib
.scsw
, &irb
->scsw
, sizeof (struct scsw
));
148 if (sch
->driver
&& sch
->driver
->irq
)
149 sch
->driver
->irq(sch
);
150 spin_unlock(sch
->lock
);
157 cio_start_handle_notoper(struct subchannel
*sch
, __u8 lpm
)
166 stsch (sch
->schid
, &sch
->schib
);
168 CIO_MSG_EVENT(0, "cio_start: 'not oper' status for "
169 "subchannel 0.%x.%04x!\n", sch
->schid
.ssid
,
171 sprintf(dbf_text
, "no%s", sch
->dev
.bus_id
);
172 CIO_TRACE_EVENT(0, dbf_text
);
173 CIO_HEX_EVENT(0, &sch
->schib
, sizeof (struct schib
));
175 return (sch
->lpm
? -EACCES
: -ENODEV
);
179 cio_start_key (struct subchannel
*sch
, /* subchannel structure */
180 struct ccw1
* cpa
, /* logical channel prog addr */
181 __u8 lpm
, /* logical path mask */
182 __u8 key
) /* storage key */
188 CIO_TRACE_EVENT(4, "stIO");
189 CIO_TRACE_EVENT(4, sch
->dev
.bus_id
);
191 orb
= &to_io_private(sch
)->orb
;
192 /* sch is always under 2G. */
193 orb
->intparm
= (u32
)(addr_t
)sch
;
196 orb
->pfch
= sch
->options
.prefetch
== 0;
197 orb
->spnd
= sch
->options
.suspend
;
198 orb
->ssic
= sch
->options
.suspend
&& sch
->options
.inter
;
199 orb
->lpm
= (lpm
!= 0) ? lpm
: sch
->lpm
;
202 * for 64 bit we always support 64 bit IDAWs with 4k page size only
208 /* issue "Start Subchannel" */
209 orb
->cpa
= (__u32
) __pa(cpa
);
210 ccode
= ssch(sch
->schid
, orb
);
212 /* process condition code */
213 sprintf(dbf_txt
, "ccode:%d", ccode
);
214 CIO_TRACE_EVENT(4, dbf_txt
);
219 * initialize device status information
221 sch
->schib
.scsw
.actl
|= SCSW_ACTL_START_PEND
;
223 case 1: /* status pending */
226 default: /* device/path not operational */
227 return cio_start_handle_notoper(sch
, lpm
);
232 cio_start (struct subchannel
*sch
, struct ccw1
*cpa
, __u8 lpm
)
234 return cio_start_key(sch
, cpa
, lpm
, PAGE_DEFAULT_KEY
);
238 * resume suspended I/O operation
241 cio_resume (struct subchannel
*sch
)
246 CIO_TRACE_EVENT (4, "resIO");
247 CIO_TRACE_EVENT (4, sch
->dev
.bus_id
);
249 ccode
= rsch (sch
->schid
);
251 sprintf (dbf_txt
, "ccode:%d", ccode
);
252 CIO_TRACE_EVENT (4, dbf_txt
);
256 sch
->schib
.scsw
.actl
|= SCSW_ACTL_RESUME_PEND
;
264 * useless to wait for request completion
265 * as device is no longer operational !
275 cio_halt(struct subchannel
*sch
)
283 CIO_TRACE_EVENT (2, "haltIO");
284 CIO_TRACE_EVENT (2, sch
->dev
.bus_id
);
287 * Issue "Halt subchannel" and process condition code
289 ccode
= hsch (sch
->schid
);
291 sprintf (dbf_txt
, "ccode:%d", ccode
);
292 CIO_TRACE_EVENT (2, dbf_txt
);
296 sch
->schib
.scsw
.actl
|= SCSW_ACTL_HALT_PEND
;
298 case 1: /* status pending */
301 default: /* device not operational */
307 * Clear I/O operation
310 cio_clear(struct subchannel
*sch
)
318 CIO_TRACE_EVENT (2, "clearIO");
319 CIO_TRACE_EVENT (2, sch
->dev
.bus_id
);
322 * Issue "Clear subchannel" and process condition code
324 ccode
= csch (sch
->schid
);
326 sprintf (dbf_txt
, "ccode:%d", ccode
);
327 CIO_TRACE_EVENT (2, dbf_txt
);
331 sch
->schib
.scsw
.actl
|= SCSW_ACTL_CLEAR_PEND
;
333 default: /* device not operational */
339 * Function: cio_cancel
340 * Issues a "Cancel Subchannel" on the specified subchannel
341 * Note: We don't need any fancy intparms and flags here
342 * since xsch is executed synchronously.
343 * Only for common I/O internal use as for now.
346 cio_cancel (struct subchannel
*sch
)
354 CIO_TRACE_EVENT (2, "cancelIO");
355 CIO_TRACE_EVENT (2, sch
->dev
.bus_id
);
357 ccode
= xsch (sch
->schid
);
359 sprintf (dbf_txt
, "ccode:%d", ccode
);
360 CIO_TRACE_EVENT (2, dbf_txt
);
363 case 0: /* success */
364 /* Update information in scsw. */
365 stsch (sch
->schid
, &sch
->schib
);
367 case 1: /* status pending */
369 case 2: /* not applicable */
371 default: /* not oper */
377 * Function: cio_modify
378 * Issues a "Modify Subchannel" on the specified subchannel
381 cio_modify (struct subchannel
*sch
)
383 int ccode
, retry
, ret
;
386 for (retry
= 0; retry
< 5; retry
++) {
387 ccode
= msch_err (sch
->schid
, &sch
->schib
);
388 if (ccode
< 0) /* -EIO if msch gets a program check. */
391 case 0: /* successfull */
393 case 1: /* status pending */
396 udelay (100); /* allow for recovery */
399 case 3: /* not operational */
410 cio_enable_subchannel (struct subchannel
*sch
, unsigned int isc
)
417 CIO_TRACE_EVENT (2, "ensch");
418 CIO_TRACE_EVENT (2, sch
->dev
.bus_id
);
420 if (sch_is_pseudo_sch(sch
))
422 ccode
= stsch (sch
->schid
, &sch
->schib
);
426 for (retry
= 5, ret
= 0; retry
> 0; retry
--) {
427 sch
->schib
.pmcw
.ena
= 1;
428 sch
->schib
.pmcw
.isc
= isc
;
429 sch
->schib
.pmcw
.intparm
= (u32
)(addr_t
)sch
;
430 ret
= cio_modify(sch
);
435 * Got a program check in cio_modify. Try without
436 * the concurrent sense bit the next time.
438 sch
->schib
.pmcw
.csense
= 0;
440 stsch (sch
->schid
, &sch
->schib
);
441 if (sch
->schib
.pmcw
.ena
)
446 if (tsch(sch
->schid
, &irb
) != 0)
450 sprintf (dbf_txt
, "ret:%d", ret
);
451 CIO_TRACE_EVENT (2, dbf_txt
);
456 * Disable subchannel.
459 cio_disable_subchannel (struct subchannel
*sch
)
466 CIO_TRACE_EVENT (2, "dissch");
467 CIO_TRACE_EVENT (2, sch
->dev
.bus_id
);
469 if (sch_is_pseudo_sch(sch
))
471 ccode
= stsch (sch
->schid
, &sch
->schib
);
472 if (ccode
== 3) /* Not operational. */
475 if (sch
->schib
.scsw
.actl
!= 0)
477 * the disable function must not be called while there are
478 * requests pending for completion !
482 for (retry
= 5, ret
= 0; retry
> 0; retry
--) {
483 sch
->schib
.pmcw
.ena
= 0;
484 ret
= cio_modify(sch
);
489 * The subchannel is busy or status pending.
490 * We'll disable when the next interrupt was delivered
491 * via the state machine.
495 stsch (sch
->schid
, &sch
->schib
);
496 if (!sch
->schib
.pmcw
.ena
)
500 sprintf (dbf_txt
, "ret:%d", ret
);
501 CIO_TRACE_EVENT (2, dbf_txt
);
505 int cio_create_sch_lock(struct subchannel
*sch
)
507 sch
->lock
= kmalloc(sizeof(spinlock_t
), GFP_KERNEL
);
510 spin_lock_init(sch
->lock
);
515 * cio_validate_subchannel()
517 * Find out subchannel type and initialize struct subchannel.
519 * SUBCHANNEL_TYPE_IO for a normal io subchannel
520 * SUBCHANNEL_TYPE_CHSC for a chsc subchannel
521 * SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel
522 * SUBCHANNEL_TYPE_ADM for a adm(?) subchannel
523 * -ENXIO for non-defined subchannels
524 * -ENODEV for subchannels with invalid device number or blacklisted devices
527 cio_validate_subchannel (struct subchannel
*sch
, struct subchannel_id schid
)
533 sprintf (dbf_txt
, "valsch%x", schid
.sch_no
);
534 CIO_TRACE_EVENT (4, dbf_txt
);
536 /* Nuke all fields. */
537 memset(sch
, 0, sizeof(struct subchannel
));
540 if (cio_is_console(schid
)) {
541 sch
->lock
= cio_get_console_lock();
543 err
= cio_create_sch_lock(sch
);
547 mutex_init(&sch
->reg_mutex
);
548 /* Set a name for the subchannel */
549 snprintf (sch
->dev
.bus_id
, BUS_ID_SIZE
, "0.%x.%04x", schid
.ssid
,
553 * The first subchannel that is not-operational (ccode==3)
554 * indicates that there aren't any more devices available.
555 * If stsch gets an exception, it means the current subchannel set
558 ccode
= stsch_err (schid
, &sch
->schib
);
560 err
= (ccode
== 3) ? -ENXIO
: ccode
;
563 /* Copy subchannel type from path management control word. */
564 sch
->st
= sch
->schib
.pmcw
.st
;
567 * ... just being curious we check for non I/O subchannels
570 CIO_DEBUG(KERN_INFO
, 0,
571 "Subchannel 0.%x.%04x reports "
572 "non-I/O subchannel type %04X\n",
573 sch
->schid
.ssid
, sch
->schid
.sch_no
, sch
->st
);
574 /* We stop here for non-io subchannels. */
579 /* Initialization for io subchannels. */
580 if (!sch
->schib
.pmcw
.dnv
) {
581 /* io subchannel but device number is invalid. */
585 /* Devno is valid. */
586 if (is_blacklisted (sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
)) {
588 * This device must not be known to Linux. So we simply
589 * say that there is no device and return ENODEV.
591 CIO_MSG_EVENT(4, "Blacklisted device detected "
592 "at devno %04X, subchannel set %x\n",
593 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
);
597 if (cio_is_console(sch
->schid
))
600 sch
->opm
= chp_get_sch_opm(sch
);
601 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
603 CIO_DEBUG(KERN_INFO
, 0,
604 "Detected device %04x on subchannel 0.%x.%04X"
605 " - PIM = %02X, PAM = %02X, POM = %02X\n",
606 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
,
607 sch
->schid
.sch_no
, sch
->schib
.pmcw
.pim
,
608 sch
->schib
.pmcw
.pam
, sch
->schib
.pmcw
.pom
);
611 * We now have to initially ...
612 * ... set "interruption subclass"
613 * ... enable "concurrent sense"
614 * ... enable "multipath mode" if more than one
615 * CHPID is available. This is done regardless
616 * whether multiple paths are available for us.
618 sch
->schib
.pmcw
.isc
= 3; /* could be smth. else */
619 sch
->schib
.pmcw
.csense
= 1; /* concurrent sense */
620 sch
->schib
.pmcw
.ena
= 0;
621 if ((sch
->lpm
& (sch
->lpm
- 1)) != 0)
622 sch
->schib
.pmcw
.mp
= 1; /* multipath mode */
623 /* clean up possible residual cmf stuff */
624 sch
->schib
.pmcw
.mme
= 0;
625 sch
->schib
.pmcw
.mbfc
= 0;
626 sch
->schib
.pmcw
.mbi
= 0;
630 if (!cio_is_console(schid
))
637 * do_IRQ() handles all normal I/O device IRQ's (the special
638 * SMP cross-CPU interrupts have their own specific
643 do_IRQ (struct pt_regs
*regs
)
645 struct tpi_info
*tpi_info
;
646 struct subchannel
*sch
;
648 struct pt_regs
*old_regs
;
650 old_regs
= set_irq_regs(regs
);
652 asm volatile ("mc 0,0");
653 if (S390_lowcore
.int_clock
>= S390_lowcore
.jiffy_timer
)
655 * Make sure that the i/o interrupt did not "overtake"
656 * the last HZ timer interrupt.
658 account_ticks(S390_lowcore
.int_clock
);
660 * Get interrupt information from lowcore
662 tpi_info
= (struct tpi_info
*) __LC_SUBCHANNEL_ID
;
663 irb
= (struct irb
*) __LC_IRB
;
665 kstat_cpu(smp_processor_id()).irqs
[IO_INTERRUPT
]++;
667 * Non I/O-subchannel thin interrupts are processed differently
669 if (tpi_info
->adapter_IO
== 1 &&
670 tpi_info
->int_type
== IO_INTERRUPT_TYPE
) {
674 sch
= (struct subchannel
*)(unsigned long)tpi_info
->intparm
;
676 spin_lock(sch
->lock
);
677 /* Store interrupt response block to lowcore. */
678 if (tsch (tpi_info
->schid
, irb
) == 0 && sch
) {
679 /* Keep subchannel information word up to date. */
680 memcpy (&sch
->schib
.scsw
, &irb
->scsw
,
682 /* Call interrupt handler if there is one. */
683 if (sch
->driver
&& sch
->driver
->irq
)
684 sch
->driver
->irq(sch
);
687 spin_unlock(sch
->lock
);
689 * Are more interrupts pending?
690 * If so, the tpi instruction will update the lowcore
691 * to hold the info for the next interrupt.
692 * We don't do this for VM because a tpi drops the cpu
693 * out of the sie which costs more cycles than it saves.
695 } while (!MACHINE_IS_VM
&& tpi (NULL
) != 0);
697 set_irq_regs(old_regs
);
700 #ifdef CONFIG_CCW_CONSOLE
701 static struct subchannel console_subchannel
;
702 static struct io_subchannel_private console_priv
;
703 static int console_subchannel_in_use
;
705 void *cio_get_console_priv(void)
707 return &console_priv
;
711 * busy wait for the next interrupt on the console
716 unsigned long cr6
__attribute__ ((aligned (8)));
717 unsigned long save_cr6
__attribute__ ((aligned (8)));
720 * before entering the spinlock we may already have
721 * processed the interrupt on a different CPU...
723 if (!console_subchannel_in_use
)
726 /* disable all but isc 7 (console device) */
727 __ctl_store (save_cr6
, 6, 6);
729 __ctl_load (cr6
, 6, 6);
732 spin_unlock(console_subchannel
.lock
);
735 spin_lock(console_subchannel
.lock
);
736 } while (console_subchannel
.schib
.scsw
.actl
!= 0);
738 * restore previous isc value
740 __ctl_load (save_cr6
, 6, 6);
744 cio_test_for_console(struct subchannel_id schid
, void *data
)
746 if (stsch_err(schid
, &console_subchannel
.schib
) != 0)
748 if (console_subchannel
.schib
.pmcw
.dnv
&&
749 console_subchannel
.schib
.pmcw
.dev
==
751 console_irq
= schid
.sch_no
;
752 return 1; /* found */
759 cio_get_console_sch_no(void)
761 struct subchannel_id schid
;
763 init_subchannel_id(&schid
);
764 if (console_irq
!= -1) {
765 /* VM provided us with the irq number of the console. */
766 schid
.sch_no
= console_irq
;
767 if (stsch(schid
, &console_subchannel
.schib
) != 0 ||
768 !console_subchannel
.schib
.pmcw
.dnv
)
770 console_devno
= console_subchannel
.schib
.pmcw
.dev
;
771 } else if (console_devno
!= -1) {
772 /* At least the console device number is known. */
773 for_each_subchannel(cio_test_for_console
, NULL
);
774 if (console_irq
== -1)
777 /* unlike in 2.4, we cannot autoprobe here, since
778 * the channel subsystem is not fully initialized.
779 * With some luck, the HWC console can take over */
780 printk(KERN_WARNING
"cio: No ccw console found!\n");
787 cio_probe_console(void)
790 struct subchannel_id schid
;
792 if (xchg(&console_subchannel_in_use
, 1) != 0)
793 return ERR_PTR(-EBUSY
);
794 sch_no
= cio_get_console_sch_no();
796 console_subchannel_in_use
= 0;
797 return ERR_PTR(-ENODEV
);
799 memset(&console_subchannel
, 0, sizeof(struct subchannel
));
800 init_subchannel_id(&schid
);
801 schid
.sch_no
= sch_no
;
802 ret
= cio_validate_subchannel(&console_subchannel
, schid
);
804 console_subchannel_in_use
= 0;
805 return ERR_PTR(-ENODEV
);
809 * enable console I/O-interrupt subclass 7
812 console_subchannel
.schib
.pmcw
.isc
= 7;
813 console_subchannel
.schib
.pmcw
.intparm
=
814 (u32
)(addr_t
)&console_subchannel
;
815 ret
= cio_modify(&console_subchannel
);
817 console_subchannel_in_use
= 0;
820 return &console_subchannel
;
824 cio_release_console(void)
826 console_subchannel
.schib
.pmcw
.intparm
= 0;
827 cio_modify(&console_subchannel
);
828 ctl_clear_bit(6, 24);
829 console_subchannel_in_use
= 0;
832 /* Bah... hack to catch console special sausages. */
834 cio_is_console(struct subchannel_id schid
)
836 if (!console_subchannel_in_use
)
838 return schid_equal(&schid
, &console_subchannel
.schid
);
842 cio_get_console_subchannel(void)
844 if (!console_subchannel_in_use
)
846 return &console_subchannel
;
851 __disable_subchannel_easy(struct subchannel_id schid
, struct schib
*schib
)
856 for (retry
=0;retry
<3;retry
++) {
858 cc
= msch(schid
, schib
);
860 return (cc
==3?-ENODEV
:-EBUSY
);
862 if (!schib
->pmcw
.ena
)
865 return -EBUSY
; /* uhm... */
868 /* we can't use the normal udelay here, since it enables external interrupts */
870 static void udelay_reset(unsigned long usecs
)
872 uint64_t start_cc
, end_cc
;
874 asm volatile ("STCK %0" : "=m" (start_cc
));
877 asm volatile ("STCK %0" : "=m" (end_cc
));
878 } while (((end_cc
- start_cc
)/4096) < usecs
);
882 __clear_subchannel_easy(struct subchannel_id schid
)
888 for (retry
=0;retry
<20;retry
++) {
892 tsch(ti
.schid
, (struct irb
*)__LC_IRB
);
893 if (schid_equal(&ti
.schid
, &schid
))
901 static int pgm_check_occured
;
903 static void cio_reset_pgm_check_handler(void)
905 pgm_check_occured
= 1;
908 static int stsch_reset(struct subchannel_id schid
, volatile struct schib
*addr
)
912 pgm_check_occured
= 0;
913 s390_base_pgm_handler_fn
= cio_reset_pgm_check_handler
;
914 rc
= stsch(schid
, addr
);
915 s390_base_pgm_handler_fn
= NULL
;
917 /* The program check handler could have changed pgm_check_occured. */
920 if (pgm_check_occured
)
926 static int __shutdown_subchannel_easy(struct subchannel_id schid
, void *data
)
930 if (stsch_reset(schid
, &schib
))
934 switch(__disable_subchannel_easy(schid
, &schib
)) {
938 default: /* -EBUSY */
939 if (__clear_subchannel_easy(schid
))
940 break; /* give up... */
941 stsch(schid
, &schib
);
942 __disable_subchannel_easy(schid
, &schib
);
947 static atomic_t chpid_reset_count
;
949 static void s390_reset_chpids_mcck_handler(void)
954 /* Check for pending channel report word. */
955 mci
= (struct mci
*)&S390_lowcore
.mcck_interruption_code
;
958 /* Process channel report words. */
959 while (stcrw(&crw
) == 0) {
960 /* Check for responses to RCHP. */
961 if (crw
.slct
&& crw
.rsc
== CRW_RSC_CPATH
)
962 atomic_dec(&chpid_reset_count
);
966 #define RCHP_TIMEOUT (30 * USEC_PER_SEC)
967 static void css_reset(void)
970 unsigned long long timeout
;
973 /* Reset subchannels. */
974 for_each_subchannel(__shutdown_subchannel_easy
, NULL
);
975 /* Reset channel paths. */
976 s390_base_mcck_handler_fn
= s390_reset_chpids_mcck_handler
;
977 /* Enable channel report machine checks. */
978 __ctl_set_bit(14, 28);
979 /* Temporarily reenable machine checks. */
982 for (i
= 0; i
<= __MAX_CHPID
; i
++) {
985 if ((ret
== 0) || (ret
== 2))
987 * rchp either succeeded, or another rchp is already
988 * in progress. In either case, we'll get a crw.
990 atomic_inc(&chpid_reset_count
);
992 /* Wait for machine check for all channel paths. */
993 timeout
= get_clock() + (RCHP_TIMEOUT
<< 12);
994 while (atomic_read(&chpid_reset_count
) != 0) {
995 if (get_clock() > timeout
)
999 /* Disable machine checks again. */
1000 local_mcck_disable();
1001 /* Disable channel report machine checks. */
1002 __ctl_clear_bit(14, 28);
1003 s390_base_mcck_handler_fn
= NULL
;
1006 static struct reset_call css_reset_call
= {
1010 static int __init
init_css_reset_call(void)
1012 atomic_set(&chpid_reset_count
, 0);
1013 register_reset_call(&css_reset_call
);
1017 arch_initcall(init_css_reset_call
);
1019 struct sch_match_id
{
1020 struct subchannel_id schid
;
1021 struct ccw_dev_id devid
;
1025 static int __reipl_subchannel_match(struct subchannel_id schid
, void *data
)
1028 struct sch_match_id
*match_id
= data
;
1030 if (stsch_reset(schid
, &schib
))
1032 if (schib
.pmcw
.dnv
&&
1033 (schib
.pmcw
.dev
== match_id
->devid
.devno
) &&
1034 (schid
.ssid
== match_id
->devid
.ssid
)) {
1035 match_id
->schid
= schid
;
1042 static int reipl_find_schid(struct ccw_dev_id
*devid
,
1043 struct subchannel_id
*schid
)
1045 struct sch_match_id match_id
;
1047 match_id
.devid
= *devid
;
1048 match_id
.rc
= -ENODEV
;
1049 for_each_subchannel(__reipl_subchannel_match
, &match_id
);
1050 if (match_id
.rc
== 0)
1051 *schid
= match_id
.schid
;
1055 extern void do_reipl_asm(__u32 schid
);
1057 /* Make sure all subchannels are quiet before we re-ipl an lpar. */
1058 void reipl_ccw_dev(struct ccw_dev_id
*devid
)
1060 struct subchannel_id schid
;
1062 s390_reset_system();
1063 if (reipl_find_schid(devid
, &schid
) != 0)
1064 panic("IPL Device not found\n");
1065 do_reipl_asm(*((__u32
*)&schid
));
1068 int __init
cio_get_iplinfo(struct cio_iplinfo
*iplinfo
)
1070 struct subchannel_id schid
;
1073 schid
= *(struct subchannel_id
*)__LC_SUBCHANNEL_ID
;
1076 if (stsch(schid
, &schib
))
1078 if (!schib
.pmcw
.dnv
)
1080 iplinfo
->devno
= schib
.pmcw
.dev
;
1081 iplinfo
->is_qdio
= schib
.pmcw
.qf
;