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 int cio_create_sch_lock(struct subchannel
*sch
)
476 sch
->lock
= kmalloc(sizeof(spinlock_t
), GFP_KERNEL
);
479 spin_lock_init(sch
->lock
);
483 static int cio_check_devno_blacklisted(struct subchannel
*sch
)
485 if (is_blacklisted(sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
)) {
487 * This device must not be known to Linux. So we simply
488 * say that there is no device and return ENODEV.
490 CIO_MSG_EVENT(6, "Blacklisted device detected "
491 "at devno %04X, subchannel set %x\n",
492 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
);
498 static int cio_validate_io_subchannel(struct subchannel
*sch
)
500 /* Initialization for io subchannels. */
501 if (!css_sch_is_valid(&sch
->schib
))
504 /* Devno is valid. */
505 return cio_check_devno_blacklisted(sch
);
508 static int cio_validate_msg_subchannel(struct subchannel
*sch
)
510 /* Initialization for message subchannels. */
511 if (!css_sch_is_valid(&sch
->schib
))
514 /* Devno is valid. */
515 return cio_check_devno_blacklisted(sch
);
519 * cio_validate_subchannel - basic validation of subchannel
520 * @sch: subchannel structure to be filled out
521 * @schid: subchannel id
523 * Find out subchannel type and initialize struct subchannel.
526 * -ENXIO for non-defined subchannels
527 * -ENODEV for invalid subchannels or blacklisted devices
528 * -EIO for subchannels in an invalid subchannel set
530 int cio_validate_subchannel(struct subchannel
*sch
, struct subchannel_id schid
)
536 sprintf(dbf_txt
, "valsch%x", schid
.sch_no
);
537 CIO_TRACE_EVENT(4, dbf_txt
);
539 /* Nuke all fields. */
540 memset(sch
, 0, sizeof(struct subchannel
));
543 err
= cio_create_sch_lock(sch
);
546 mutex_init(&sch
->reg_mutex
);
549 * The first subchannel that is not-operational (ccode==3)
550 * indicates that there aren't any more devices available.
551 * If stsch gets an exception, it means the current subchannel set
554 ccode
= stsch_err (schid
, &sch
->schib
);
556 err
= (ccode
== 3) ? -ENXIO
: ccode
;
559 /* Copy subchannel type from path management control word. */
560 sch
->st
= sch
->schib
.pmcw
.st
;
563 case SUBCHANNEL_TYPE_IO
:
564 err
= cio_validate_io_subchannel(sch
);
566 case SUBCHANNEL_TYPE_MSG
:
567 err
= cio_validate_msg_subchannel(sch
);
575 CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
576 sch
->schid
.ssid
, sch
->schid
.sch_no
, sch
->st
);
585 * do_IRQ() handles all normal I/O device IRQ's (the special
586 * SMP cross-CPU interrupts have their own specific
590 void __irq_entry
do_IRQ(struct pt_regs
*regs
)
592 struct tpi_info
*tpi_info
;
593 struct subchannel
*sch
;
595 struct pt_regs
*old_regs
;
597 old_regs
= set_irq_regs(regs
);
599 __this_cpu_write(s390_idle
.nohz_delay
, 1);
600 if (S390_lowcore
.int_clock
>= S390_lowcore
.clock_comparator
)
601 /* Serve timer interrupts first. */
602 clock_comparator_work();
604 * Get interrupt information from lowcore
606 tpi_info
= (struct tpi_info
*)&S390_lowcore
.subchannel_id
;
607 irb
= (struct irb
*)&S390_lowcore
.irb
;
609 kstat_incr_irqs_this_cpu(IO_INTERRUPT
, NULL
);
610 if (tpi_info
->adapter_IO
) {
611 do_adapter_IO(tpi_info
->isc
);
614 sch
= (struct subchannel
*)(unsigned long)tpi_info
->intparm
;
616 /* Clear pending interrupt condition. */
617 inc_irq_stat(IRQIO_CIO
);
618 tsch(tpi_info
->schid
, irb
);
621 spin_lock(sch
->lock
);
622 /* Store interrupt response block to lowcore. */
623 if (tsch(tpi_info
->schid
, irb
) == 0) {
624 /* Keep subchannel information word up to date. */
625 memcpy (&sch
->schib
.scsw
, &irb
->scsw
,
627 /* Call interrupt handler if there is one. */
628 if (sch
->driver
&& sch
->driver
->irq
)
629 sch
->driver
->irq(sch
);
631 inc_irq_stat(IRQIO_CIO
);
633 inc_irq_stat(IRQIO_CIO
);
634 spin_unlock(sch
->lock
);
636 * Are more interrupts pending?
637 * If so, the tpi instruction will update the lowcore
638 * to hold the info for the next interrupt.
639 * We don't do this for VM because a tpi drops the cpu
640 * out of the sie which costs more cycles than it saves.
642 } while (MACHINE_IS_LPAR
&& tpi(NULL
) != 0);
644 set_irq_regs(old_regs
);
647 #ifdef CONFIG_CCW_CONSOLE
648 static struct subchannel
*console_sch
;
651 * Use cio_tsch to update the subchannel status and call the interrupt handler
652 * if status had been pending. Called with the subchannel's lock held.
654 void cio_tsch(struct subchannel
*sch
)
659 irb
= (struct irb
*)&S390_lowcore
.irb
;
660 /* Store interrupt response block to lowcore. */
661 if (tsch(sch
->schid
, irb
) != 0)
662 /* Not status pending or not operational. */
664 memcpy(&sch
->schib
.scsw
, &irb
->scsw
, sizeof(union scsw
));
665 /* Call interrupt handler with updated status. */
666 irq_context
= in_interrupt();
671 if (sch
->driver
&& sch
->driver
->irq
)
672 sch
->driver
->irq(sch
);
674 inc_irq_stat(IRQIO_CIO
);
681 static int cio_test_for_console(struct subchannel_id schid
, void *data
)
685 if (stsch_err(schid
, &schib
) != 0)
687 if ((schib
.pmcw
.st
== SUBCHANNEL_TYPE_IO
) && schib
.pmcw
.dnv
&&
688 (schib
.pmcw
.dev
== console_devno
)) {
689 console_irq
= schid
.sch_no
;
690 return 1; /* found */
695 static int cio_get_console_sch_no(void)
697 struct subchannel_id schid
;
700 init_subchannel_id(&schid
);
701 if (console_irq
!= -1) {
702 /* VM provided us with the irq number of the console. */
703 schid
.sch_no
= console_irq
;
704 if (stsch_err(schid
, &schib
) != 0 ||
705 (schib
.pmcw
.st
!= SUBCHANNEL_TYPE_IO
) || !schib
.pmcw
.dnv
)
707 console_devno
= schib
.pmcw
.dev
;
708 } else if (console_devno
!= -1) {
709 /* At least the console device number is known. */
710 for_each_subchannel(cio_test_for_console
, NULL
);
715 struct subchannel
*cio_probe_console(void)
717 struct subchannel_id schid
;
718 struct subchannel
*sch
;
721 sch_no
= cio_get_console_sch_no();
723 pr_warning("No CCW console was found\n");
724 return ERR_PTR(-ENODEV
);
726 init_subchannel_id(&schid
);
727 schid
.sch_no
= sch_no
;
728 sch
= css_alloc_subchannel(schid
);
732 isc_register(CONSOLE_ISC
);
733 sch
->config
.isc
= CONSOLE_ISC
;
734 sch
->config
.intparm
= (u32
)(addr_t
)sch
;
735 ret
= cio_commit_config(sch
);
737 isc_unregister(CONSOLE_ISC
);
738 put_device(&sch
->dev
);
745 int cio_is_console(struct subchannel_id schid
)
749 return schid_equal(&schid
, &console_sch
->schid
);
752 void cio_register_early_subchannels(void)
759 ret
= css_register_subchannel(console_sch
);
761 put_device(&console_sch
->dev
);
763 #endif /* CONFIG_CCW_CONSOLE */
766 __disable_subchannel_easy(struct subchannel_id schid
, struct schib
*schib
)
771 for (retry
=0;retry
<3;retry
++) {
773 cc
= msch_err(schid
, schib
);
775 return (cc
==3?-ENODEV
:-EBUSY
);
776 if (stsch_err(schid
, schib
) || !css_sch_is_valid(schib
))
778 if (!schib
->pmcw
.ena
)
781 return -EBUSY
; /* uhm... */
785 __clear_io_subchannel_easy(struct subchannel_id schid
)
791 for (retry
=0;retry
<20;retry
++) {
795 tsch(ti
.schid
, (struct irb
*)&S390_lowcore
.irb
);
796 if (schid_equal(&ti
.schid
, &schid
))
804 static void __clear_chsc_subchannel_easy(void)
806 /* It seems we can only wait for a bit here :/ */
810 static int pgm_check_occured
;
812 static void cio_reset_pgm_check_handler(void)
814 pgm_check_occured
= 1;
817 static int stsch_reset(struct subchannel_id schid
, struct schib
*addr
)
821 pgm_check_occured
= 0;
822 s390_base_pgm_handler_fn
= cio_reset_pgm_check_handler
;
823 rc
= stsch_err(schid
, addr
);
824 s390_base_pgm_handler_fn
= NULL
;
826 /* The program check handler could have changed pgm_check_occured. */
829 if (pgm_check_occured
)
835 static int __shutdown_subchannel_easy(struct subchannel_id schid
, void *data
)
839 if (stsch_reset(schid
, &schib
))
843 switch(__disable_subchannel_easy(schid
, &schib
)) {
847 default: /* -EBUSY */
848 switch (schib
.pmcw
.st
) {
849 case SUBCHANNEL_TYPE_IO
:
850 if (__clear_io_subchannel_easy(schid
))
851 goto out
; /* give up... */
853 case SUBCHANNEL_TYPE_CHSC
:
854 __clear_chsc_subchannel_easy();
857 /* No default clear strategy */
860 stsch_err(schid
, &schib
);
861 __disable_subchannel_easy(schid
, &schib
);
867 static atomic_t chpid_reset_count
;
869 static void s390_reset_chpids_mcck_handler(void)
874 /* Check for pending channel report word. */
875 mci
= (struct mci
*)&S390_lowcore
.mcck_interruption_code
;
878 /* Process channel report words. */
879 while (stcrw(&crw
) == 0) {
880 /* Check for responses to RCHP. */
881 if (crw
.slct
&& crw
.rsc
== CRW_RSC_CPATH
)
882 atomic_dec(&chpid_reset_count
);
886 #define RCHP_TIMEOUT (30 * USEC_PER_SEC)
887 static void css_reset(void)
890 unsigned long long timeout
;
893 /* Reset subchannels. */
894 for_each_subchannel(__shutdown_subchannel_easy
, NULL
);
895 /* Reset channel paths. */
896 s390_base_mcck_handler_fn
= s390_reset_chpids_mcck_handler
;
897 /* Enable channel report machine checks. */
898 __ctl_set_bit(14, 28);
899 /* Temporarily reenable machine checks. */
902 for (i
= 0; i
<= __MAX_CHPID
; i
++) {
905 if ((ret
== 0) || (ret
== 2))
907 * rchp either succeeded, or another rchp is already
908 * in progress. In either case, we'll get a crw.
910 atomic_inc(&chpid_reset_count
);
912 /* Wait for machine check for all channel paths. */
913 timeout
= get_tod_clock() + (RCHP_TIMEOUT
<< 12);
914 while (atomic_read(&chpid_reset_count
) != 0) {
915 if (get_tod_clock() > timeout
)
919 /* Disable machine checks again. */
920 local_mcck_disable();
921 /* Disable channel report machine checks. */
922 __ctl_clear_bit(14, 28);
923 s390_base_mcck_handler_fn
= NULL
;
926 static struct reset_call css_reset_call
= {
930 static int __init
init_css_reset_call(void)
932 atomic_set(&chpid_reset_count
, 0);
933 register_reset_call(&css_reset_call
);
937 arch_initcall(init_css_reset_call
);
939 struct sch_match_id
{
940 struct subchannel_id schid
;
941 struct ccw_dev_id devid
;
945 static int __reipl_subchannel_match(struct subchannel_id schid
, void *data
)
948 struct sch_match_id
*match_id
= data
;
950 if (stsch_reset(schid
, &schib
))
952 if ((schib
.pmcw
.st
== SUBCHANNEL_TYPE_IO
) && schib
.pmcw
.dnv
&&
953 (schib
.pmcw
.dev
== match_id
->devid
.devno
) &&
954 (schid
.ssid
== match_id
->devid
.ssid
)) {
955 match_id
->schid
= schid
;
962 static int reipl_find_schid(struct ccw_dev_id
*devid
,
963 struct subchannel_id
*schid
)
965 struct sch_match_id match_id
;
967 match_id
.devid
= *devid
;
968 match_id
.rc
= -ENODEV
;
969 for_each_subchannel(__reipl_subchannel_match
, &match_id
);
970 if (match_id
.rc
== 0)
971 *schid
= match_id
.schid
;
975 extern void do_reipl_asm(__u32 schid
);
977 /* Make sure all subchannels are quiet before we re-ipl an lpar. */
978 void reipl_ccw_dev(struct ccw_dev_id
*devid
)
980 struct subchannel_id
uninitialized_var(schid
);
982 s390_reset_system(NULL
, NULL
);
983 if (reipl_find_schid(devid
, &schid
) != 0)
984 panic("IPL Device not found\n");
985 do_reipl_asm(*((__u32
*)&schid
));
988 int __init
cio_get_iplinfo(struct cio_iplinfo
*iplinfo
)
990 struct subchannel_id schid
;
993 schid
= *(struct subchannel_id
*)&S390_lowcore
.subchannel_id
;
996 if (stsch_err(schid
, &schib
))
998 if (schib
.pmcw
.st
!= SUBCHANNEL_TYPE_IO
)
1000 if (!schib
.pmcw
.dnv
)
1002 iplinfo
->devno
= schib
.pmcw
.dev
;
1003 iplinfo
->is_qdio
= schib
.pmcw
.qf
;
1008 * cio_tm_start_key - perform start function
1009 * @sch: subchannel on which to perform the start function
1010 * @tcw: transport-command word to be started
1011 * @lpm: mask of paths to use
1012 * @key: storage key to use for storage access
1014 * Start the tcw on the given subchannel. Return zero on success, non-zero
1017 int cio_tm_start_key(struct subchannel
*sch
, struct tcw
*tcw
, u8 lpm
, u8 key
)
1020 union orb
*orb
= &to_io_private(sch
)->orb
;
1022 memset(orb
, 0, sizeof(union orb
));
1023 orb
->tm
.intparm
= (u32
) (addr_t
) sch
;
1024 orb
->tm
.key
= key
>> 4;
1026 orb
->tm
.lpm
= lpm
? lpm
: sch
->lpm
;
1027 orb
->tm
.tcw
= (u32
) (addr_t
) tcw
;
1028 cc
= ssch(sch
->schid
, orb
);
1036 return cio_start_handle_notoper(sch
, lpm
);
1041 * cio_tm_intrg - perform interrogate function
1042 * @sch - subchannel on which to perform the interrogate function
1044 * If the specified subchannel is running in transport-mode, perform the
1045 * interrogate function. Return zero on success, non-zero otherwie.
1047 int cio_tm_intrg(struct subchannel
*sch
)
1051 if (!to_io_private(sch
)->orb
.tm
.b
)
1053 cc
= xsch(sch
->schid
);