2 * S/390 common I/O routines -- low level i/o calls
4 * Copyright IBM Corp. 1999, 2008
5 * Author(s): Ingo Adlung (adlung@de.ibm.com)
6 * Cornelia Huck (cornelia.huck@de.ibm.com)
7 * Arnd Bergmann (arndb@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
11 #define KMSG_COMPONENT "cio"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/ftrace.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/device.h>
19 #include <linux/kernel_stat.h>
20 #include <linux/interrupt.h>
22 #include <asm/delay.h>
24 #include <asm/irq_regs.h>
25 #include <asm/setup.h>
26 #include <asm/reset.h>
28 #include <asm/chpid.h>
31 #include <asm/cputime.h>
40 #include "blacklist.h"
41 #include "cio_debug.h"
44 debug_info_t
*cio_debug_msg_id
;
45 debug_info_t
*cio_debug_trace_id
;
46 debug_info_t
*cio_debug_crw_id
;
49 * Function: cio_debug_init
50 * Initializes three debug logs for common I/O:
51 * - cio_msg logs generic cio messages
52 * - cio_trace logs the calling of different functions
53 * - cio_crw logs machine check related cio messages
55 static int __init
cio_debug_init(void)
57 cio_debug_msg_id
= debug_register("cio_msg", 16, 1, 16 * sizeof(long));
58 if (!cio_debug_msg_id
)
60 debug_register_view(cio_debug_msg_id
, &debug_sprintf_view
);
61 debug_set_level(cio_debug_msg_id
, 2);
62 cio_debug_trace_id
= debug_register("cio_trace", 16, 1, 16);
63 if (!cio_debug_trace_id
)
65 debug_register_view(cio_debug_trace_id
, &debug_hex_ascii_view
);
66 debug_set_level(cio_debug_trace_id
, 2);
67 cio_debug_crw_id
= debug_register("cio_crw", 16, 1, 16 * sizeof(long));
68 if (!cio_debug_crw_id
)
70 debug_register_view(cio_debug_crw_id
, &debug_sprintf_view
);
71 debug_set_level(cio_debug_crw_id
, 4);
76 debug_unregister(cio_debug_msg_id
);
77 if (cio_debug_trace_id
)
78 debug_unregister(cio_debug_trace_id
);
80 debug_unregister(cio_debug_crw_id
);
84 arch_initcall (cio_debug_init
);
86 int cio_set_options(struct subchannel
*sch
, int flags
)
88 struct io_subchannel_private
*priv
= to_io_private(sch
);
90 priv
->options
.suspend
= (flags
& DOIO_ALLOW_SUSPEND
) != 0;
91 priv
->options
.prefetch
= (flags
& DOIO_DENY_PREFETCH
) != 0;
92 priv
->options
.inter
= (flags
& DOIO_SUPPRESS_INTER
) != 0;
97 cio_start_handle_notoper(struct subchannel
*sch
, __u8 lpm
)
106 CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
107 "subchannel 0.%x.%04x!\n", sch
->schid
.ssid
,
110 if (cio_update_schib(sch
))
113 sprintf(dbf_text
, "no%s", dev_name(&sch
->dev
));
114 CIO_TRACE_EVENT(0, dbf_text
);
115 CIO_HEX_EVENT(0, &sch
->schib
, sizeof (struct schib
));
117 return (sch
->lpm
? -EACCES
: -ENODEV
);
121 cio_start_key (struct subchannel
*sch
, /* subchannel structure */
122 struct ccw1
* cpa
, /* logical channel prog addr */
123 __u8 lpm
, /* logical path mask */
124 __u8 key
) /* storage key */
126 struct io_subchannel_private
*priv
= to_io_private(sch
);
127 union orb
*orb
= &priv
->orb
;
130 CIO_TRACE_EVENT(5, "stIO");
131 CIO_TRACE_EVENT(5, dev_name(&sch
->dev
));
133 memset(orb
, 0, sizeof(union orb
));
134 /* sch is always under 2G. */
135 orb
->cmd
.intparm
= (u32
)(addr_t
)sch
;
138 orb
->cmd
.pfch
= priv
->options
.prefetch
== 0;
139 orb
->cmd
.spnd
= priv
->options
.suspend
;
140 orb
->cmd
.ssic
= priv
->options
.suspend
&& priv
->options
.inter
;
141 orb
->cmd
.lpm
= (lpm
!= 0) ? lpm
: sch
->lpm
;
144 * for 64 bit we always support 64 bit IDAWs with 4k page size only
149 orb
->cmd
.key
= key
>> 4;
150 /* issue "Start Subchannel" */
151 orb
->cmd
.cpa
= (__u32
) __pa(cpa
);
152 ccode
= ssch(sch
->schid
, orb
);
154 /* process condition code */
155 CIO_HEX_EVENT(5, &ccode
, sizeof(ccode
));
160 * initialize device status information
162 sch
->schib
.scsw
.cmd
.actl
|= SCSW_ACTL_START_PEND
;
164 case 1: /* status pending */
167 case 3: /* device/path not operational */
168 return cio_start_handle_notoper(sch
, lpm
);
175 cio_start (struct subchannel
*sch
, struct ccw1
*cpa
, __u8 lpm
)
177 return cio_start_key(sch
, cpa
, lpm
, PAGE_DEFAULT_KEY
);
181 * resume suspended I/O operation
184 cio_resume (struct subchannel
*sch
)
188 CIO_TRACE_EVENT(4, "resIO");
189 CIO_TRACE_EVENT(4, dev_name(&sch
->dev
));
191 ccode
= rsch (sch
->schid
);
193 CIO_HEX_EVENT(4, &ccode
, sizeof(ccode
));
197 sch
->schib
.scsw
.cmd
.actl
|= SCSW_ACTL_RESUME_PEND
;
205 * useless to wait for request completion
206 * as device is no longer operational !
216 cio_halt(struct subchannel
*sch
)
223 CIO_TRACE_EVENT(2, "haltIO");
224 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
227 * Issue "Halt subchannel" and process condition code
229 ccode
= hsch (sch
->schid
);
231 CIO_HEX_EVENT(2, &ccode
, sizeof(ccode
));
235 sch
->schib
.scsw
.cmd
.actl
|= SCSW_ACTL_HALT_PEND
;
237 case 1: /* status pending */
240 default: /* device not operational */
246 * Clear I/O operation
249 cio_clear(struct subchannel
*sch
)
256 CIO_TRACE_EVENT(2, "clearIO");
257 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
260 * Issue "Clear subchannel" and process condition code
262 ccode
= csch (sch
->schid
);
264 CIO_HEX_EVENT(2, &ccode
, sizeof(ccode
));
268 sch
->schib
.scsw
.cmd
.actl
|= SCSW_ACTL_CLEAR_PEND
;
270 default: /* device not operational */
276 * Function: cio_cancel
277 * Issues a "Cancel Subchannel" on the specified subchannel
278 * Note: We don't need any fancy intparms and flags here
279 * since xsch is executed synchronously.
280 * Only for common I/O internal use as for now.
283 cio_cancel (struct subchannel
*sch
)
290 CIO_TRACE_EVENT(2, "cancelIO");
291 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
293 ccode
= xsch (sch
->schid
);
295 CIO_HEX_EVENT(2, &ccode
, sizeof(ccode
));
298 case 0: /* success */
299 /* Update information in scsw. */
300 if (cio_update_schib(sch
))
303 case 1: /* status pending */
305 case 2: /* not applicable */
307 default: /* not oper */
313 static void cio_apply_config(struct subchannel
*sch
, struct schib
*schib
)
315 schib
->pmcw
.intparm
= sch
->config
.intparm
;
316 schib
->pmcw
.mbi
= sch
->config
.mbi
;
317 schib
->pmcw
.isc
= sch
->config
.isc
;
318 schib
->pmcw
.ena
= sch
->config
.ena
;
319 schib
->pmcw
.mme
= sch
->config
.mme
;
320 schib
->pmcw
.mp
= sch
->config
.mp
;
321 schib
->pmcw
.csense
= sch
->config
.csense
;
322 schib
->pmcw
.mbfc
= sch
->config
.mbfc
;
323 if (sch
->config
.mbfc
)
324 schib
->mba
= sch
->config
.mba
;
327 static int cio_check_config(struct subchannel
*sch
, struct schib
*schib
)
329 return (schib
->pmcw
.intparm
== sch
->config
.intparm
) &&
330 (schib
->pmcw
.mbi
== sch
->config
.mbi
) &&
331 (schib
->pmcw
.isc
== sch
->config
.isc
) &&
332 (schib
->pmcw
.ena
== sch
->config
.ena
) &&
333 (schib
->pmcw
.mme
== sch
->config
.mme
) &&
334 (schib
->pmcw
.mp
== sch
->config
.mp
) &&
335 (schib
->pmcw
.csense
== sch
->config
.csense
) &&
336 (schib
->pmcw
.mbfc
== sch
->config
.mbfc
) &&
337 (!sch
->config
.mbfc
|| (schib
->mba
== sch
->config
.mba
));
341 * cio_commit_config - apply configuration to the subchannel
343 int cio_commit_config(struct subchannel
*sch
)
346 int ccode
, retry
, ret
= 0;
348 if (stsch_err(sch
->schid
, &schib
) || !css_sch_is_valid(&schib
))
351 for (retry
= 0; retry
< 5; retry
++) {
352 /* copy desired changes to local schib */
353 cio_apply_config(sch
, &schib
);
354 ccode
= msch_err(sch
->schid
, &schib
);
355 if (ccode
< 0) /* -EIO if msch gets a program check. */
358 case 0: /* successful */
359 if (stsch_err(sch
->schid
, &schib
) ||
360 !css_sch_is_valid(&schib
))
362 if (cio_check_config(sch
, &schib
)) {
363 /* commit changes from local schib */
364 memcpy(&sch
->schib
, &schib
, sizeof(schib
));
369 case 1: /* status pending */
372 udelay(100); /* allow for recovery */
375 case 3: /* not operational */
383 * cio_update_schib - Perform stsch and update schib if subchannel is valid.
384 * @sch: subchannel on which to perform stsch
385 * Return zero on success, -ENODEV otherwise.
387 int cio_update_schib(struct subchannel
*sch
)
391 if (stsch_err(sch
->schid
, &schib
) || !css_sch_is_valid(&schib
))
394 memcpy(&sch
->schib
, &schib
, sizeof(schib
));
397 EXPORT_SYMBOL_GPL(cio_update_schib
);
400 * cio_enable_subchannel - enable a subchannel.
401 * @sch: subchannel to be enabled
402 * @intparm: interruption parameter to set
404 int cio_enable_subchannel(struct subchannel
*sch
, u32 intparm
)
409 CIO_TRACE_EVENT(2, "ensch");
410 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
412 if (sch_is_pseudo_sch(sch
))
414 if (cio_update_schib(sch
))
418 sch
->config
.isc
= sch
->isc
;
419 sch
->config
.intparm
= intparm
;
421 for (retry
= 0; retry
< 3; retry
++) {
422 ret
= cio_commit_config(sch
);
425 * Got a program check in msch. Try without
426 * the concurrent sense bit the next time.
428 sch
->config
.csense
= 0;
429 } else if (ret
== -EBUSY
) {
431 if (tsch(sch
->schid
, &irb
) != 0)
436 CIO_HEX_EVENT(2, &ret
, sizeof(ret
));
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
)
450 CIO_TRACE_EVENT(2, "dissch");
451 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
453 if (sch_is_pseudo_sch(sch
))
455 if (cio_update_schib(sch
))
460 for (retry
= 0; retry
< 3; retry
++) {
461 ret
= cio_commit_config(sch
);
464 if (tsch(sch
->schid
, &irb
) != 0)
469 CIO_HEX_EVENT(2, &ret
, sizeof(ret
));
472 EXPORT_SYMBOL_GPL(cio_disable_subchannel
);
474 static int cio_check_devno_blacklisted(struct subchannel
*sch
)
476 if (is_blacklisted(sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
)) {
478 * This device must not be known to Linux. So we simply
479 * say that there is no device and return ENODEV.
481 CIO_MSG_EVENT(6, "Blacklisted device detected "
482 "at devno %04X, subchannel set %x\n",
483 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
);
489 static int cio_validate_io_subchannel(struct subchannel
*sch
)
491 /* Initialization for io subchannels. */
492 if (!css_sch_is_valid(&sch
->schib
))
495 /* Devno is valid. */
496 return cio_check_devno_blacklisted(sch
);
499 static int cio_validate_msg_subchannel(struct subchannel
*sch
)
501 /* Initialization for message subchannels. */
502 if (!css_sch_is_valid(&sch
->schib
))
505 /* Devno is valid. */
506 return cio_check_devno_blacklisted(sch
);
510 * cio_validate_subchannel - basic validation of subchannel
511 * @sch: subchannel structure to be filled out
512 * @schid: subchannel id
514 * Find out subchannel type and initialize struct subchannel.
517 * -ENXIO for non-defined subchannels
518 * -ENODEV for invalid subchannels or blacklisted devices
519 * -EIO for subchannels in an invalid subchannel set
521 int cio_validate_subchannel(struct subchannel
*sch
, struct subchannel_id schid
)
527 sprintf(dbf_txt
, "valsch%x", schid
.sch_no
);
528 CIO_TRACE_EVENT(4, dbf_txt
);
531 * The first subchannel that is not-operational (ccode==3)
532 * indicates that there aren't any more devices available.
533 * If stsch gets an exception, it means the current subchannel set
536 ccode
= stsch_err(schid
, &sch
->schib
);
538 err
= (ccode
== 3) ? -ENXIO
: ccode
;
541 sch
->st
= sch
->schib
.pmcw
.st
;
545 case SUBCHANNEL_TYPE_IO
:
546 err
= cio_validate_io_subchannel(sch
);
548 case SUBCHANNEL_TYPE_MSG
:
549 err
= cio_validate_msg_subchannel(sch
);
557 CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
558 sch
->schid
.ssid
, sch
->schid
.sch_no
, sch
->st
);
564 * do_IRQ() handles all normal I/O device IRQ's (the special
565 * SMP cross-CPU interrupts have their own specific
569 void __irq_entry
do_IRQ(struct pt_regs
*regs
)
571 struct tpi_info
*tpi_info
;
572 struct subchannel
*sch
;
574 struct pt_regs
*old_regs
;
576 old_regs
= set_irq_regs(regs
);
578 __this_cpu_write(s390_idle
.nohz_delay
, 1);
579 if (S390_lowcore
.int_clock
>= S390_lowcore
.clock_comparator
)
580 /* Serve timer interrupts first. */
581 clock_comparator_work();
583 * Get interrupt information from lowcore
585 tpi_info
= (struct tpi_info
*)&S390_lowcore
.subchannel_id
;
586 irb
= (struct irb
*)&S390_lowcore
.irb
;
588 kstat_incr_irqs_this_cpu(IO_INTERRUPT
, NULL
);
589 if (tpi_info
->adapter_IO
) {
590 do_adapter_IO(tpi_info
->isc
);
593 sch
= (struct subchannel
*)(unsigned long)tpi_info
->intparm
;
595 /* Clear pending interrupt condition. */
596 inc_irq_stat(IRQIO_CIO
);
597 tsch(tpi_info
->schid
, irb
);
600 spin_lock(sch
->lock
);
601 /* Store interrupt response block to lowcore. */
602 if (tsch(tpi_info
->schid
, irb
) == 0) {
603 /* Keep subchannel information word up to date. */
604 memcpy (&sch
->schib
.scsw
, &irb
->scsw
,
606 /* Call interrupt handler if there is one. */
607 if (sch
->driver
&& sch
->driver
->irq
)
608 sch
->driver
->irq(sch
);
610 inc_irq_stat(IRQIO_CIO
);
612 inc_irq_stat(IRQIO_CIO
);
613 spin_unlock(sch
->lock
);
615 * Are more interrupts pending?
616 * If so, the tpi instruction will update the lowcore
617 * to hold the info for the next interrupt.
618 * We don't do this for VM because a tpi drops the cpu
619 * out of the sie which costs more cycles than it saves.
621 } while (MACHINE_IS_LPAR
&& tpi(NULL
) != 0);
623 set_irq_regs(old_regs
);
626 #ifdef CONFIG_CCW_CONSOLE
627 static struct subchannel
*console_sch
;
630 * Use cio_tsch to update the subchannel status and call the interrupt handler
631 * if status had been pending. Called with the subchannel's lock held.
633 void cio_tsch(struct subchannel
*sch
)
638 irb
= (struct irb
*)&S390_lowcore
.irb
;
639 /* Store interrupt response block to lowcore. */
640 if (tsch(sch
->schid
, irb
) != 0)
641 /* Not status pending or not operational. */
643 memcpy(&sch
->schib
.scsw
, &irb
->scsw
, sizeof(union scsw
));
644 /* Call interrupt handler with updated status. */
645 irq_context
= in_interrupt();
650 kstat_incr_irqs_this_cpu(IO_INTERRUPT
, NULL
);
651 if (sch
->driver
&& sch
->driver
->irq
)
652 sch
->driver
->irq(sch
);
654 inc_irq_stat(IRQIO_CIO
);
661 static int cio_test_for_console(struct subchannel_id schid
, void *data
)
665 if (stsch_err(schid
, &schib
) != 0)
667 if ((schib
.pmcw
.st
== SUBCHANNEL_TYPE_IO
) && schib
.pmcw
.dnv
&&
668 (schib
.pmcw
.dev
== console_devno
)) {
669 console_irq
= schid
.sch_no
;
670 return 1; /* found */
675 static int cio_get_console_sch_no(void)
677 struct subchannel_id schid
;
680 init_subchannel_id(&schid
);
681 if (console_irq
!= -1) {
682 /* VM provided us with the irq number of the console. */
683 schid
.sch_no
= console_irq
;
684 if (stsch_err(schid
, &schib
) != 0 ||
685 (schib
.pmcw
.st
!= SUBCHANNEL_TYPE_IO
) || !schib
.pmcw
.dnv
)
687 console_devno
= schib
.pmcw
.dev
;
688 } else if (console_devno
!= -1) {
689 /* At least the console device number is known. */
690 for_each_subchannel(cio_test_for_console
, NULL
);
695 struct subchannel
*cio_probe_console(void)
697 struct subchannel_id schid
;
698 struct subchannel
*sch
;
701 sch_no
= cio_get_console_sch_no();
703 pr_warning("No CCW console was found\n");
704 return ERR_PTR(-ENODEV
);
706 init_subchannel_id(&schid
);
707 schid
.sch_no
= sch_no
;
708 sch
= css_alloc_subchannel(schid
);
712 isc_register(CONSOLE_ISC
);
713 sch
->config
.isc
= CONSOLE_ISC
;
714 sch
->config
.intparm
= (u32
)(addr_t
)sch
;
715 ret
= cio_commit_config(sch
);
717 isc_unregister(CONSOLE_ISC
);
718 put_device(&sch
->dev
);
725 int cio_is_console(struct subchannel_id schid
)
729 return schid_equal(&schid
, &console_sch
->schid
);
732 void cio_register_early_subchannels(void)
739 ret
= css_register_subchannel(console_sch
);
741 put_device(&console_sch
->dev
);
743 #endif /* CONFIG_CCW_CONSOLE */
746 __disable_subchannel_easy(struct subchannel_id schid
, struct schib
*schib
)
751 for (retry
=0;retry
<3;retry
++) {
753 cc
= msch_err(schid
, schib
);
755 return (cc
==3?-ENODEV
:-EBUSY
);
756 if (stsch_err(schid
, schib
) || !css_sch_is_valid(schib
))
758 if (!schib
->pmcw
.ena
)
761 return -EBUSY
; /* uhm... */
765 __clear_io_subchannel_easy(struct subchannel_id schid
)
771 for (retry
=0;retry
<20;retry
++) {
775 tsch(ti
.schid
, (struct irb
*)&S390_lowcore
.irb
);
776 if (schid_equal(&ti
.schid
, &schid
))
784 static void __clear_chsc_subchannel_easy(void)
786 /* It seems we can only wait for a bit here :/ */
790 static int pgm_check_occured
;
792 static void cio_reset_pgm_check_handler(void)
794 pgm_check_occured
= 1;
797 static int stsch_reset(struct subchannel_id schid
, struct schib
*addr
)
801 pgm_check_occured
= 0;
802 s390_base_pgm_handler_fn
= cio_reset_pgm_check_handler
;
803 rc
= stsch_err(schid
, addr
);
804 s390_base_pgm_handler_fn
= NULL
;
806 /* The program check handler could have changed pgm_check_occured. */
809 if (pgm_check_occured
)
815 static int __shutdown_subchannel_easy(struct subchannel_id schid
, void *data
)
819 if (stsch_reset(schid
, &schib
))
823 switch(__disable_subchannel_easy(schid
, &schib
)) {
827 default: /* -EBUSY */
828 switch (schib
.pmcw
.st
) {
829 case SUBCHANNEL_TYPE_IO
:
830 if (__clear_io_subchannel_easy(schid
))
831 goto out
; /* give up... */
833 case SUBCHANNEL_TYPE_CHSC
:
834 __clear_chsc_subchannel_easy();
837 /* No default clear strategy */
840 stsch_err(schid
, &schib
);
841 __disable_subchannel_easy(schid
, &schib
);
847 static atomic_t chpid_reset_count
;
849 static void s390_reset_chpids_mcck_handler(void)
854 /* Check for pending channel report word. */
855 mci
= (struct mci
*)&S390_lowcore
.mcck_interruption_code
;
858 /* Process channel report words. */
859 while (stcrw(&crw
) == 0) {
860 /* Check for responses to RCHP. */
861 if (crw
.slct
&& crw
.rsc
== CRW_RSC_CPATH
)
862 atomic_dec(&chpid_reset_count
);
866 #define RCHP_TIMEOUT (30 * USEC_PER_SEC)
867 static void css_reset(void)
870 unsigned long long timeout
;
873 /* Reset subchannels. */
874 for_each_subchannel(__shutdown_subchannel_easy
, NULL
);
875 /* Reset channel paths. */
876 s390_base_mcck_handler_fn
= s390_reset_chpids_mcck_handler
;
877 /* Enable channel report machine checks. */
878 __ctl_set_bit(14, 28);
879 /* Temporarily reenable machine checks. */
882 for (i
= 0; i
<= __MAX_CHPID
; i
++) {
885 if ((ret
== 0) || (ret
== 2))
887 * rchp either succeeded, or another rchp is already
888 * in progress. In either case, we'll get a crw.
890 atomic_inc(&chpid_reset_count
);
892 /* Wait for machine check for all channel paths. */
893 timeout
= get_tod_clock() + (RCHP_TIMEOUT
<< 12);
894 while (atomic_read(&chpid_reset_count
) != 0) {
895 if (get_tod_clock() > timeout
)
899 /* Disable machine checks again. */
900 local_mcck_disable();
901 /* Disable channel report machine checks. */
902 __ctl_clear_bit(14, 28);
903 s390_base_mcck_handler_fn
= NULL
;
906 static struct reset_call css_reset_call
= {
910 static int __init
init_css_reset_call(void)
912 atomic_set(&chpid_reset_count
, 0);
913 register_reset_call(&css_reset_call
);
917 arch_initcall(init_css_reset_call
);
919 struct sch_match_id
{
920 struct subchannel_id schid
;
921 struct ccw_dev_id devid
;
925 static int __reipl_subchannel_match(struct subchannel_id schid
, void *data
)
928 struct sch_match_id
*match_id
= data
;
930 if (stsch_reset(schid
, &schib
))
932 if ((schib
.pmcw
.st
== SUBCHANNEL_TYPE_IO
) && schib
.pmcw
.dnv
&&
933 (schib
.pmcw
.dev
== match_id
->devid
.devno
) &&
934 (schid
.ssid
== match_id
->devid
.ssid
)) {
935 match_id
->schid
= schid
;
942 static int reipl_find_schid(struct ccw_dev_id
*devid
,
943 struct subchannel_id
*schid
)
945 struct sch_match_id match_id
;
947 match_id
.devid
= *devid
;
948 match_id
.rc
= -ENODEV
;
949 for_each_subchannel(__reipl_subchannel_match
, &match_id
);
950 if (match_id
.rc
== 0)
951 *schid
= match_id
.schid
;
955 extern void do_reipl_asm(__u32 schid
);
957 /* Make sure all subchannels are quiet before we re-ipl an lpar. */
958 void reipl_ccw_dev(struct ccw_dev_id
*devid
)
960 struct subchannel_id
uninitialized_var(schid
);
962 s390_reset_system(NULL
, NULL
);
963 if (reipl_find_schid(devid
, &schid
) != 0)
964 panic("IPL Device not found\n");
965 do_reipl_asm(*((__u32
*)&schid
));
968 int __init
cio_get_iplinfo(struct cio_iplinfo
*iplinfo
)
970 struct subchannel_id schid
;
973 schid
= *(struct subchannel_id
*)&S390_lowcore
.subchannel_id
;
976 if (stsch_err(schid
, &schib
))
978 if (schib
.pmcw
.st
!= SUBCHANNEL_TYPE_IO
)
982 iplinfo
->devno
= schib
.pmcw
.dev
;
983 iplinfo
->is_qdio
= schib
.pmcw
.qf
;
988 * cio_tm_start_key - perform start function
989 * @sch: subchannel on which to perform the start function
990 * @tcw: transport-command word to be started
991 * @lpm: mask of paths to use
992 * @key: storage key to use for storage access
994 * Start the tcw on the given subchannel. Return zero on success, non-zero
997 int cio_tm_start_key(struct subchannel
*sch
, struct tcw
*tcw
, u8 lpm
, u8 key
)
1000 union orb
*orb
= &to_io_private(sch
)->orb
;
1002 memset(orb
, 0, sizeof(union orb
));
1003 orb
->tm
.intparm
= (u32
) (addr_t
) sch
;
1004 orb
->tm
.key
= key
>> 4;
1006 orb
->tm
.lpm
= lpm
? lpm
: sch
->lpm
;
1007 orb
->tm
.tcw
= (u32
) (addr_t
) tcw
;
1008 cc
= ssch(sch
->schid
, orb
);
1016 return cio_start_handle_notoper(sch
, lpm
);
1021 * cio_tm_intrg - perform interrogate function
1022 * @sch - subchannel on which to perform the interrogate function
1024 * If the specified subchannel is running in transport-mode, perform the
1025 * interrogate function. Return zero on success, non-zero otherwie.
1027 int cio_tm_intrg(struct subchannel
*sch
)
1031 if (!to_io_private(sch
)->orb
.tm
.b
)
1033 cc
= xsch(sch
->schid
);