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
#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>
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 <asm/cputime.h>
41
#include "blacklist.h"
42
#include "cio_debug.h"
45
debug_info_t *cio_debug_msg_id;
46
debug_info_t *cio_debug_trace_id;
47
debug_info_t *cio_debug_crw_id;
50
* Function: cio_debug_init
51
* Initializes three debug logs for common I/O:
52
* - cio_msg logs generic cio messages
53
* - cio_trace logs the calling of different functions
54
* - cio_crw logs machine check related cio messages
56
static int __init cio_debug_init(void)
58
cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long));
59
if (!cio_debug_msg_id)
61
debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
62
debug_set_level(cio_debug_msg_id, 2);
63
cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16);
64
if (!cio_debug_trace_id)
66
debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
67
debug_set_level(cio_debug_trace_id, 2);
68
cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long));
69
if (!cio_debug_crw_id)
71
debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
72
debug_set_level(cio_debug_crw_id, 4);
77
debug_unregister(cio_debug_msg_id);
78
if (cio_debug_trace_id)
79
debug_unregister(cio_debug_trace_id);
81
debug_unregister(cio_debug_crw_id);
85
arch_initcall (cio_debug_init);
88
cio_set_options (struct subchannel *sch, int flags)
90
sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0;
91
sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0;
92
sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0;
96
/* FIXME: who wants to use this? */
98
cio_get_options (struct subchannel *sch)
103
if (sch->options.suspend)
104
flags |= DOIO_ALLOW_SUSPEND;
105
if (sch->options.prefetch)
106
flags |= DOIO_DENY_PREFETCH;
107
if (sch->options.inter)
108
flags |= DOIO_SUPPRESS_INTER;
113
cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
122
CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
123
"subchannel 0.%x.%04x!\n", sch->schid.ssid,
126
if (cio_update_schib(sch))
129
sprintf(dbf_text, "no%s", dev_name(&sch->dev));
130
CIO_TRACE_EVENT(0, dbf_text);
131
CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
133
return (sch->lpm ? -EACCES : -ENODEV);
137
cio_start_key (struct subchannel *sch, /* subchannel structure */
138
struct ccw1 * cpa, /* logical channel prog addr */
139
__u8 lpm, /* logical path mask */
140
__u8 key) /* storage key */
145
CIO_TRACE_EVENT(5, "stIO");
146
CIO_TRACE_EVENT(5, dev_name(&sch->dev));
148
orb = &to_io_private(sch)->orb;
149
memset(orb, 0, sizeof(union orb));
150
/* sch is always under 2G. */
151
orb->cmd.intparm = (u32)(addr_t)sch;
154
orb->cmd.pfch = sch->options.prefetch == 0;
155
orb->cmd.spnd = sch->options.suspend;
156
orb->cmd.ssic = sch->options.suspend && sch->options.inter;
157
orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;
160
* for 64 bit we always support 64 bit IDAWs with 4k page size only
165
orb->cmd.key = key >> 4;
166
/* issue "Start Subchannel" */
167
orb->cmd.cpa = (__u32) __pa(cpa);
168
ccode = ssch(sch->schid, orb);
170
/* process condition code */
171
CIO_HEX_EVENT(5, &ccode, sizeof(ccode));
176
* initialize device status information
178
sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
180
case 1: /* status pending */
183
case 3: /* device/path not operational */
184
return cio_start_handle_notoper(sch, lpm);
191
cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
193
return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
197
* resume suspended I/O operation
200
cio_resume (struct subchannel *sch)
204
CIO_TRACE_EVENT(4, "resIO");
205
CIO_TRACE_EVENT(4, dev_name(&sch->dev));
207
ccode = rsch (sch->schid);
209
CIO_HEX_EVENT(4, &ccode, sizeof(ccode));
213
sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;
221
* useless to wait for request completion
222
* as device is no longer operational !
232
cio_halt(struct subchannel *sch)
239
CIO_TRACE_EVENT(2, "haltIO");
240
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
243
* Issue "Halt subchannel" and process condition code
245
ccode = hsch (sch->schid);
247
CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
251
sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
253
case 1: /* status pending */
256
default: /* device not operational */
262
* Clear I/O operation
265
cio_clear(struct subchannel *sch)
272
CIO_TRACE_EVENT(2, "clearIO");
273
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
276
* Issue "Clear subchannel" and process condition code
278
ccode = csch (sch->schid);
280
CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
284
sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;
286
default: /* device not operational */
292
* Function: cio_cancel
293
* Issues a "Cancel Subchannel" on the specified subchannel
294
* Note: We don't need any fancy intparms and flags here
295
* since xsch is executed synchronously.
296
* Only for common I/O internal use as for now.
299
cio_cancel (struct subchannel *sch)
306
CIO_TRACE_EVENT(2, "cancelIO");
307
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
309
ccode = xsch (sch->schid);
311
CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
314
case 0: /* success */
315
/* Update information in scsw. */
316
if (cio_update_schib(sch))
319
case 1: /* status pending */
321
case 2: /* not applicable */
323
default: /* not oper */
329
static void cio_apply_config(struct subchannel *sch, struct schib *schib)
331
schib->pmcw.intparm = sch->config.intparm;
332
schib->pmcw.mbi = sch->config.mbi;
333
schib->pmcw.isc = sch->config.isc;
334
schib->pmcw.ena = sch->config.ena;
335
schib->pmcw.mme = sch->config.mme;
336
schib->pmcw.mp = sch->config.mp;
337
schib->pmcw.csense = sch->config.csense;
338
schib->pmcw.mbfc = sch->config.mbfc;
339
if (sch->config.mbfc)
340
schib->mba = sch->config.mba;
343
static int cio_check_config(struct subchannel *sch, struct schib *schib)
345
return (schib->pmcw.intparm == sch->config.intparm) &&
346
(schib->pmcw.mbi == sch->config.mbi) &&
347
(schib->pmcw.isc == sch->config.isc) &&
348
(schib->pmcw.ena == sch->config.ena) &&
349
(schib->pmcw.mme == sch->config.mme) &&
350
(schib->pmcw.mp == sch->config.mp) &&
351
(schib->pmcw.csense == sch->config.csense) &&
352
(schib->pmcw.mbfc == sch->config.mbfc) &&
353
(!sch->config.mbfc || (schib->mba == sch->config.mba));
357
* cio_commit_config - apply configuration to the subchannel
359
int cio_commit_config(struct subchannel *sch)
362
int ccode, retry, ret = 0;
364
if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
367
for (retry = 0; retry < 5; retry++) {
368
/* copy desired changes to local schib */
369
cio_apply_config(sch, &schib);
370
ccode = msch_err(sch->schid, &schib);
371
if (ccode < 0) /* -EIO if msch gets a program check. */
374
case 0: /* successful */
375
if (stsch(sch->schid, &schib) ||
376
!css_sch_is_valid(&schib))
378
if (cio_check_config(sch, &schib)) {
379
/* commit changes from local schib */
380
memcpy(&sch->schib, &schib, sizeof(schib));
385
case 1: /* status pending */
388
udelay(100); /* allow for recovery */
391
case 3: /* not operational */
399
* cio_update_schib - Perform stsch and update schib if subchannel is valid.
400
* @sch: subchannel on which to perform stsch
401
* Return zero on success, -ENODEV otherwise.
403
int cio_update_schib(struct subchannel *sch)
407
if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
410
memcpy(&sch->schib, &schib, sizeof(schib));
413
EXPORT_SYMBOL_GPL(cio_update_schib);
416
* cio_enable_subchannel - enable a subchannel.
417
* @sch: subchannel to be enabled
418
* @intparm: interruption parameter to set
420
int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
425
CIO_TRACE_EVENT(2, "ensch");
426
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
428
if (sch_is_pseudo_sch(sch))
430
if (cio_update_schib(sch))
434
sch->config.isc = sch->isc;
435
sch->config.intparm = intparm;
437
for (retry = 0; retry < 3; retry++) {
438
ret = cio_commit_config(sch);
441
* Got a program check in msch. Try without
442
* the concurrent sense bit the next time.
444
sch->config.csense = 0;
445
} else if (ret == -EBUSY) {
447
if (tsch(sch->schid, &irb) != 0)
452
CIO_HEX_EVENT(2, &ret, sizeof(ret));
455
EXPORT_SYMBOL_GPL(cio_enable_subchannel);
458
* cio_disable_subchannel - disable a subchannel.
459
* @sch: subchannel to disable
461
int cio_disable_subchannel(struct subchannel *sch)
466
CIO_TRACE_EVENT(2, "dissch");
467
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
469
if (sch_is_pseudo_sch(sch))
471
if (cio_update_schib(sch))
476
for (retry = 0; retry < 3; retry++) {
477
ret = cio_commit_config(sch);
480
if (tsch(sch->schid, &irb) != 0)
485
CIO_HEX_EVENT(2, &ret, sizeof(ret));
488
EXPORT_SYMBOL_GPL(cio_disable_subchannel);
490
int cio_create_sch_lock(struct subchannel *sch)
492
sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
495
spin_lock_init(sch->lock);
499
static int cio_check_devno_blacklisted(struct subchannel *sch)
501
if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) {
503
* This device must not be known to Linux. So we simply
504
* say that there is no device and return ENODEV.
506
CIO_MSG_EVENT(6, "Blacklisted device detected "
507
"at devno %04X, subchannel set %x\n",
508
sch->schib.pmcw.dev, sch->schid.ssid);
514
static int cio_validate_io_subchannel(struct subchannel *sch)
516
/* Initialization for io subchannels. */
517
if (!css_sch_is_valid(&sch->schib))
520
/* Devno is valid. */
521
return cio_check_devno_blacklisted(sch);
524
static int cio_validate_msg_subchannel(struct subchannel *sch)
526
/* Initialization for message subchannels. */
527
if (!css_sch_is_valid(&sch->schib))
530
/* Devno is valid. */
531
return cio_check_devno_blacklisted(sch);
535
* cio_validate_subchannel - basic validation of subchannel
536
* @sch: subchannel structure to be filled out
537
* @schid: subchannel id
539
* Find out subchannel type and initialize struct subchannel.
542
* -ENXIO for non-defined subchannels
543
* -ENODEV for invalid subchannels or blacklisted devices
544
* -EIO for subchannels in an invalid subchannel set
546
int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid)
552
sprintf(dbf_txt, "valsch%x", schid.sch_no);
553
CIO_TRACE_EVENT(4, dbf_txt);
555
/* Nuke all fields. */
556
memset(sch, 0, sizeof(struct subchannel));
559
if (cio_is_console(schid)) {
560
sch->lock = cio_get_console_lock();
562
err = cio_create_sch_lock(sch);
566
mutex_init(&sch->reg_mutex);
569
* The first subchannel that is not-operational (ccode==3)
570
* indicates that there aren't any more devices available.
571
* If stsch gets an exception, it means the current subchannel set
574
ccode = stsch_err (schid, &sch->schib);
576
err = (ccode == 3) ? -ENXIO : ccode;
579
/* Copy subchannel type from path management control word. */
580
sch->st = sch->schib.pmcw.st;
583
case SUBCHANNEL_TYPE_IO:
584
err = cio_validate_io_subchannel(sch);
586
case SUBCHANNEL_TYPE_MSG:
587
err = cio_validate_msg_subchannel(sch);
595
CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
596
sch->schid.ssid, sch->schid.sch_no, sch->st);
599
if (!cio_is_console(schid))
606
* do_IRQ() handles all normal I/O device IRQ's (the special
607
* SMP cross-CPU interrupts have their own specific
611
void __irq_entry do_IRQ(struct pt_regs *regs)
613
struct tpi_info *tpi_info;
614
struct subchannel *sch;
616
struct pt_regs *old_regs;
618
old_regs = set_irq_regs(regs);
621
__get_cpu_var(s390_idle).nohz_delay = 1;
622
if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
623
/* Serve timer interrupts first. */
624
clock_comparator_work();
626
* Get interrupt information from lowcore
628
tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
629
irb = (struct irb *) __LC_IRB;
631
kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++;
633
* Non I/O-subchannel thin interrupts are processed differently
635
if (tpi_info->adapter_IO == 1 &&
636
tpi_info->int_type == IO_INTERRUPT_TYPE) {
637
do_adapter_IO(tpi_info->isc);
640
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
642
/* Clear pending interrupt condition. */
643
tsch(tpi_info->schid, irb);
646
spin_lock(sch->lock);
647
/* Store interrupt response block to lowcore. */
648
if (tsch(tpi_info->schid, irb) == 0) {
649
/* Keep subchannel information word up to date. */
650
memcpy (&sch->schib.scsw, &irb->scsw,
652
/* Call interrupt handler if there is one. */
653
if (sch->driver && sch->driver->irq)
654
sch->driver->irq(sch);
656
spin_unlock(sch->lock);
658
* Are more interrupts pending?
659
* If so, the tpi instruction will update the lowcore
660
* to hold the info for the next interrupt.
661
* We don't do this for VM because a tpi drops the cpu
662
* out of the sie which costs more cycles than it saves.
664
} while (!MACHINE_IS_VM && tpi (NULL) != 0);
666
set_irq_regs(old_regs);
669
#ifdef CONFIG_CCW_CONSOLE
670
static struct subchannel console_subchannel;
671
static struct io_subchannel_private console_priv;
672
static int console_subchannel_in_use;
675
* Use tpi to get a pending interrupt, call the interrupt handler and
676
* return a pointer to the subchannel structure.
678
static int cio_tpi(void)
680
struct tpi_info *tpi_info;
681
struct subchannel *sch;
685
tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
688
irb = (struct irb *) __LC_IRB;
689
/* Store interrupt response block to lowcore. */
690
if (tsch(tpi_info->schid, irb) != 0)
691
/* Not status pending or not operational. */
693
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
696
irq_context = in_interrupt();
700
spin_lock(sch->lock);
701
memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw));
702
if (sch->driver && sch->driver->irq)
703
sch->driver->irq(sch);
704
spin_unlock(sch->lock);
711
void *cio_get_console_priv(void)
713
return &console_priv;
717
* busy wait for the next interrupt on the console
719
void wait_cons_dev(void)
720
__releases(console_subchannel.lock)
721
__acquires(console_subchannel.lock)
723
unsigned long cr6 __attribute__ ((aligned (8)));
724
unsigned long save_cr6 __attribute__ ((aligned (8)));
727
* before entering the spinlock we may already have
728
* processed the interrupt on a different CPU...
730
if (!console_subchannel_in_use)
733
/* disable all but the console isc */
734
__ctl_store (save_cr6, 6, 6);
735
cr6 = 1UL << (31 - CONSOLE_ISC);
736
__ctl_load (cr6, 6, 6);
739
spin_unlock(console_subchannel.lock);
742
spin_lock(console_subchannel.lock);
743
} while (console_subchannel.schib.scsw.cmd.actl != 0);
745
* restore previous isc value
747
__ctl_load (save_cr6, 6, 6);
751
cio_test_for_console(struct subchannel_id schid, void *data)
753
if (stsch_err(schid, &console_subchannel.schib) != 0)
755
if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) &&
756
console_subchannel.schib.pmcw.dnv &&
757
(console_subchannel.schib.pmcw.dev == console_devno)) {
758
console_irq = schid.sch_no;
759
return 1; /* found */
766
cio_get_console_sch_no(void)
768
struct subchannel_id schid;
770
init_subchannel_id(&schid);
771
if (console_irq != -1) {
772
/* VM provided us with the irq number of the console. */
773
schid.sch_no = console_irq;
774
if (stsch(schid, &console_subchannel.schib) != 0 ||
775
(console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) ||
776
!console_subchannel.schib.pmcw.dnv)
778
console_devno = console_subchannel.schib.pmcw.dev;
779
} else if (console_devno != -1) {
780
/* At least the console device number is known. */
781
for_each_subchannel(cio_test_for_console, NULL);
782
if (console_irq == -1)
785
/* unlike in 2.4, we cannot autoprobe here, since
786
* the channel subsystem is not fully initialized.
787
* With some luck, the HWC console can take over */
794
cio_probe_console(void)
797
struct subchannel_id schid;
799
if (xchg(&console_subchannel_in_use, 1) != 0)
800
return ERR_PTR(-EBUSY);
801
sch_no = cio_get_console_sch_no();
803
console_subchannel_in_use = 0;
804
pr_warning("No CCW console was found\n");
805
return ERR_PTR(-ENODEV);
807
memset(&console_subchannel, 0, sizeof(struct subchannel));
808
init_subchannel_id(&schid);
809
schid.sch_no = sch_no;
810
ret = cio_validate_subchannel(&console_subchannel, schid);
812
console_subchannel_in_use = 0;
813
return ERR_PTR(-ENODEV);
817
* enable console I/O-interrupt subclass
819
isc_register(CONSOLE_ISC);
820
console_subchannel.config.isc = CONSOLE_ISC;
821
console_subchannel.config.intparm = (u32)(addr_t)&console_subchannel;
822
ret = cio_commit_config(&console_subchannel);
824
isc_unregister(CONSOLE_ISC);
825
console_subchannel_in_use = 0;
828
return &console_subchannel;
832
cio_release_console(void)
834
console_subchannel.config.intparm = 0;
835
cio_commit_config(&console_subchannel);
836
isc_unregister(CONSOLE_ISC);
837
console_subchannel_in_use = 0;
840
/* Bah... hack to catch console special sausages. */
842
cio_is_console(struct subchannel_id schid)
844
if (!console_subchannel_in_use)
846
return schid_equal(&schid, &console_subchannel.schid);
850
cio_get_console_subchannel(void)
852
if (!console_subchannel_in_use)
854
return &console_subchannel;
859
__disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
864
for (retry=0;retry<3;retry++) {
866
cc = msch(schid, schib);
868
return (cc==3?-ENODEV:-EBUSY);
869
if (stsch(schid, schib) || !css_sch_is_valid(schib))
871
if (!schib->pmcw.ena)
874
return -EBUSY; /* uhm... */
878
__clear_io_subchannel_easy(struct subchannel_id schid)
884
for (retry=0;retry<20;retry++) {
888
tsch(ti.schid, (struct irb *)__LC_IRB);
889
if (schid_equal(&ti.schid, &schid))
897
static void __clear_chsc_subchannel_easy(void)
899
/* It seems we can only wait for a bit here :/ */
903
static int pgm_check_occured;
905
static void cio_reset_pgm_check_handler(void)
907
pgm_check_occured = 1;
910
static int stsch_reset(struct subchannel_id schid, struct schib *addr)
914
pgm_check_occured = 0;
915
s390_base_pgm_handler_fn = cio_reset_pgm_check_handler;
916
rc = stsch(schid, addr);
917
s390_base_pgm_handler_fn = NULL;
919
/* The program check handler could have changed pgm_check_occured. */
922
if (pgm_check_occured)
928
static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
932
if (stsch_reset(schid, &schib))
936
switch(__disable_subchannel_easy(schid, &schib)) {
940
default: /* -EBUSY */
941
switch (schib.pmcw.st) {
942
case SUBCHANNEL_TYPE_IO:
943
if (__clear_io_subchannel_easy(schid))
944
goto out; /* give up... */
946
case SUBCHANNEL_TYPE_CHSC:
947
__clear_chsc_subchannel_easy();
950
/* No default clear strategy */
953
stsch(schid, &schib);
954
__disable_subchannel_easy(schid, &schib);
960
static atomic_t chpid_reset_count;
962
static void s390_reset_chpids_mcck_handler(void)
967
/* Check for pending channel report word. */
968
mci = (struct mci *)&S390_lowcore.mcck_interruption_code;
971
/* Process channel report words. */
972
while (stcrw(&crw) == 0) {
973
/* Check for responses to RCHP. */
974
if (crw.slct && crw.rsc == CRW_RSC_CPATH)
975
atomic_dec(&chpid_reset_count);
979
#define RCHP_TIMEOUT (30 * USEC_PER_SEC)
980
static void css_reset(void)
983
unsigned long long timeout;
986
/* Reset subchannels. */
987
for_each_subchannel(__shutdown_subchannel_easy, NULL);
988
/* Reset channel paths. */
989
s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler;
990
/* Enable channel report machine checks. */
991
__ctl_set_bit(14, 28);
992
/* Temporarily reenable machine checks. */
995
for (i = 0; i <= __MAX_CHPID; i++) {
998
if ((ret == 0) || (ret == 2))
1000
* rchp either succeeded, or another rchp is already
1001
* in progress. In either case, we'll get a crw.
1003
atomic_inc(&chpid_reset_count);
1005
/* Wait for machine check for all channel paths. */
1006
timeout = get_clock() + (RCHP_TIMEOUT << 12);
1007
while (atomic_read(&chpid_reset_count) != 0) {
1008
if (get_clock() > timeout)
1012
/* Disable machine checks again. */
1013
local_mcck_disable();
1014
/* Disable channel report machine checks. */
1015
__ctl_clear_bit(14, 28);
1016
s390_base_mcck_handler_fn = NULL;
1019
static struct reset_call css_reset_call = {
1023
static int __init init_css_reset_call(void)
1025
atomic_set(&chpid_reset_count, 0);
1026
register_reset_call(&css_reset_call);
1030
arch_initcall(init_css_reset_call);
1032
struct sch_match_id {
1033
struct subchannel_id schid;
1034
struct ccw_dev_id devid;
1038
static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
1041
struct sch_match_id *match_id = data;
1043
if (stsch_reset(schid, &schib))
1045
if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
1046
(schib.pmcw.dev == match_id->devid.devno) &&
1047
(schid.ssid == match_id->devid.ssid)) {
1048
match_id->schid = schid;
1055
static int reipl_find_schid(struct ccw_dev_id *devid,
1056
struct subchannel_id *schid)
1058
struct sch_match_id match_id;
1060
match_id.devid = *devid;
1061
match_id.rc = -ENODEV;
1062
for_each_subchannel(__reipl_subchannel_match, &match_id);
1063
if (match_id.rc == 0)
1064
*schid = match_id.schid;
1068
extern void do_reipl_asm(__u32 schid);
1070
/* Make sure all subchannels are quiet before we re-ipl an lpar. */
1071
void reipl_ccw_dev(struct ccw_dev_id *devid)
1073
struct subchannel_id schid;
1075
s390_reset_system();
1076
if (reipl_find_schid(devid, &schid) != 0)
1077
panic("IPL Device not found\n");
1078
do_reipl_asm(*((__u32*)&schid));
1081
int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
1083
struct subchannel_id schid;
1086
schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID;
1089
if (stsch(schid, &schib))
1091
if (schib.pmcw.st != SUBCHANNEL_TYPE_IO)
1093
if (!schib.pmcw.dnv)
1095
iplinfo->devno = schib.pmcw.dev;
1096
iplinfo->is_qdio = schib.pmcw.qf;
1101
* cio_tm_start_key - perform start function
1102
* @sch: subchannel on which to perform the start function
1103
* @tcw: transport-command word to be started
1104
* @lpm: mask of paths to use
1105
* @key: storage key to use for storage access
1107
* Start the tcw on the given subchannel. Return zero on success, non-zero
1110
int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key)
1113
union orb *orb = &to_io_private(sch)->orb;
1115
memset(orb, 0, sizeof(union orb));
1116
orb->tm.intparm = (u32) (addr_t) sch;
1117
orb->tm.key = key >> 4;
1119
orb->tm.lpm = lpm ? lpm : sch->lpm;
1120
orb->tm.tcw = (u32) (addr_t) tcw;
1121
cc = ssch(sch->schid, orb);
1129
return cio_start_handle_notoper(sch, lpm);
1134
* cio_tm_intrg - perform interrogate function
1135
* @sch - subchannel on which to perform the interrogate function
1137
* If the specified subchannel is running in transport-mode, perform the
1138
* interrogate function. Return zero on success, non-zero otherwie.
1140
int cio_tm_intrg(struct subchannel *sch)
1144
if (!to_io_private(sch)->orb.tm.b)
1146
cc = xsch(sch->schid);