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
);
77 printk(KERN_WARNING
"cio: could not initialize debugging\n");
81 arch_initcall (cio_debug_init
);
84 cio_set_options (struct subchannel
*sch
, int flags
)
86 sch
->options
.suspend
= (flags
& DOIO_ALLOW_SUSPEND
) != 0;
87 sch
->options
.prefetch
= (flags
& DOIO_DENY_PREFETCH
) != 0;
88 sch
->options
.inter
= (flags
& DOIO_SUPPRESS_INTER
) != 0;
92 /* FIXME: who wants to use this? */
94 cio_get_options (struct subchannel
*sch
)
99 if (sch
->options
.suspend
)
100 flags
|= DOIO_ALLOW_SUSPEND
;
101 if (sch
->options
.prefetch
)
102 flags
|= DOIO_DENY_PREFETCH
;
103 if (sch
->options
.inter
)
104 flags
|= DOIO_SUPPRESS_INTER
;
109 * Use tpi to get a pending interrupt, call the interrupt handler and
110 * return a pointer to the subchannel structure.
115 struct tpi_info
*tpi_info
;
116 struct subchannel
*sch
;
119 tpi_info
= (struct tpi_info
*) __LC_SUBCHANNEL_ID
;
122 irb
= (struct irb
*) __LC_IRB
;
123 /* Store interrupt response block to lowcore. */
124 if (tsch (tpi_info
->schid
, irb
) != 0)
125 /* Not status pending or not operational. */
127 sch
= (struct subchannel
*)(unsigned long)tpi_info
->intparm
;
132 spin_lock(sch
->lock
);
133 memcpy(&sch
->schib
.scsw
, &irb
->scsw
, sizeof(union scsw
));
134 if (sch
->driver
&& sch
->driver
->irq
)
135 sch
->driver
->irq(sch
);
136 spin_unlock(sch
->lock
);
143 cio_start_handle_notoper(struct subchannel
*sch
, __u8 lpm
)
152 stsch (sch
->schid
, &sch
->schib
);
154 CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
155 "subchannel 0.%x.%04x!\n", sch
->schid
.ssid
,
157 sprintf(dbf_text
, "no%s", sch
->dev
.bus_id
);
158 CIO_TRACE_EVENT(0, dbf_text
);
159 CIO_HEX_EVENT(0, &sch
->schib
, sizeof (struct schib
));
161 return (sch
->lpm
? -EACCES
: -ENODEV
);
165 cio_start_key (struct subchannel
*sch
, /* subchannel structure */
166 struct ccw1
* cpa
, /* logical channel prog addr */
167 __u8 lpm
, /* logical path mask */
168 __u8 key
) /* storage key */
174 CIO_TRACE_EVENT(4, "stIO");
175 CIO_TRACE_EVENT(4, sch
->dev
.bus_id
);
177 orb
= &to_io_private(sch
)->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 default: /* device/path not operational */
213 return cio_start_handle_notoper(sch
, lpm
);
218 cio_start (struct subchannel
*sch
, struct ccw1
*cpa
, __u8 lpm
)
220 return cio_start_key(sch
, cpa
, lpm
, PAGE_DEFAULT_KEY
);
224 * resume suspended I/O operation
227 cio_resume (struct subchannel
*sch
)
232 CIO_TRACE_EVENT (4, "resIO");
233 CIO_TRACE_EVENT (4, sch
->dev
.bus_id
);
235 ccode
= rsch (sch
->schid
);
237 sprintf (dbf_txt
, "ccode:%d", ccode
);
238 CIO_TRACE_EVENT (4, dbf_txt
);
242 sch
->schib
.scsw
.cmd
.actl
|= SCSW_ACTL_RESUME_PEND
;
250 * useless to wait for request completion
251 * as device is no longer operational !
261 cio_halt(struct subchannel
*sch
)
269 CIO_TRACE_EVENT (2, "haltIO");
270 CIO_TRACE_EVENT (2, sch
->dev
.bus_id
);
273 * Issue "Halt subchannel" and process condition code
275 ccode
= hsch (sch
->schid
);
277 sprintf (dbf_txt
, "ccode:%d", ccode
);
278 CIO_TRACE_EVENT (2, dbf_txt
);
282 sch
->schib
.scsw
.cmd
.actl
|= SCSW_ACTL_HALT_PEND
;
284 case 1: /* status pending */
287 default: /* device not operational */
293 * Clear I/O operation
296 cio_clear(struct subchannel
*sch
)
304 CIO_TRACE_EVENT (2, "clearIO");
305 CIO_TRACE_EVENT (2, sch
->dev
.bus_id
);
308 * Issue "Clear subchannel" and process condition code
310 ccode
= csch (sch
->schid
);
312 sprintf (dbf_txt
, "ccode:%d", ccode
);
313 CIO_TRACE_EVENT (2, dbf_txt
);
317 sch
->schib
.scsw
.cmd
.actl
|= SCSW_ACTL_CLEAR_PEND
;
319 default: /* device not operational */
325 * Function: cio_cancel
326 * Issues a "Cancel Subchannel" on the specified subchannel
327 * Note: We don't need any fancy intparms and flags here
328 * since xsch is executed synchronously.
329 * Only for common I/O internal use as for now.
332 cio_cancel (struct subchannel
*sch
)
340 CIO_TRACE_EVENT (2, "cancelIO");
341 CIO_TRACE_EVENT (2, sch
->dev
.bus_id
);
343 ccode
= xsch (sch
->schid
);
345 sprintf (dbf_txt
, "ccode:%d", ccode
);
346 CIO_TRACE_EVENT (2, dbf_txt
);
349 case 0: /* success */
350 /* Update information in scsw. */
351 stsch (sch
->schid
, &sch
->schib
);
353 case 1: /* status pending */
355 case 2: /* not applicable */
357 default: /* not oper */
363 * Function: cio_modify
364 * Issues a "Modify Subchannel" on the specified subchannel
367 cio_modify (struct subchannel
*sch
)
369 int ccode
, retry
, ret
;
372 for (retry
= 0; retry
< 5; retry
++) {
373 ccode
= msch_err (sch
->schid
, &sch
->schib
);
374 if (ccode
< 0) /* -EIO if msch gets a program check. */
377 case 0: /* successfull */
379 case 1: /* status pending */
382 udelay (100); /* allow for recovery */
385 case 3: /* not operational */
393 * cio_enable_subchannel - enable a subchannel.
394 * @sch: subchannel to be enabled
395 * @intparm: interruption parameter to set
397 int cio_enable_subchannel(struct subchannel
*sch
, u32 intparm
)
404 CIO_TRACE_EVENT (2, "ensch");
405 CIO_TRACE_EVENT (2, sch
->dev
.bus_id
);
407 if (sch_is_pseudo_sch(sch
))
409 ccode
= stsch (sch
->schid
, &sch
->schib
);
413 for (retry
= 5, ret
= 0; retry
> 0; retry
--) {
414 sch
->schib
.pmcw
.ena
= 1;
415 sch
->schib
.pmcw
.isc
= sch
->isc
;
416 sch
->schib
.pmcw
.intparm
= intparm
;
417 ret
= cio_modify(sch
);
422 * Got a program check in cio_modify. Try without
423 * the concurrent sense bit the next time.
425 sch
->schib
.pmcw
.csense
= 0;
427 stsch (sch
->schid
, &sch
->schib
);
428 if (sch
->schib
.pmcw
.ena
)
433 if (tsch(sch
->schid
, &irb
) != 0)
437 sprintf (dbf_txt
, "ret:%d", ret
);
438 CIO_TRACE_EVENT (2, dbf_txt
);
441 EXPORT_SYMBOL_GPL(cio_enable_subchannel
);
444 * cio_disable_subchannel - disable a subchannel.
445 * @sch: subchannel to disable
447 int cio_disable_subchannel(struct subchannel
*sch
)
454 CIO_TRACE_EVENT (2, "dissch");
455 CIO_TRACE_EVENT (2, sch
->dev
.bus_id
);
457 if (sch_is_pseudo_sch(sch
))
459 ccode
= stsch (sch
->schid
, &sch
->schib
);
460 if (ccode
== 3) /* Not operational. */
463 if (scsw_actl(&sch
->schib
.scsw
) != 0)
465 * the disable function must not be called while there are
466 * requests pending for completion !
470 for (retry
= 5, ret
= 0; retry
> 0; retry
--) {
471 sch
->schib
.pmcw
.ena
= 0;
472 ret
= cio_modify(sch
);
477 * The subchannel is busy or status pending.
478 * We'll disable when the next interrupt was delivered
479 * via the state machine.
483 stsch (sch
->schid
, &sch
->schib
);
484 if (!sch
->schib
.pmcw
.ena
)
488 sprintf (dbf_txt
, "ret:%d", ret
);
489 CIO_TRACE_EVENT (2, dbf_txt
);
492 EXPORT_SYMBOL_GPL(cio_disable_subchannel
);
494 int cio_create_sch_lock(struct subchannel
*sch
)
496 sch
->lock
= kmalloc(sizeof(spinlock_t
), GFP_KERNEL
);
499 spin_lock_init(sch
->lock
);
503 static int cio_check_devno_blacklisted(struct subchannel
*sch
)
505 if (is_blacklisted(sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
)) {
507 * This device must not be known to Linux. So we simply
508 * say that there is no device and return ENODEV.
510 CIO_MSG_EVENT(6, "Blacklisted device detected "
511 "at devno %04X, subchannel set %x\n",
512 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
);
518 static int cio_validate_io_subchannel(struct subchannel
*sch
)
520 /* Initialization for io subchannels. */
521 if (!css_sch_is_valid(&sch
->schib
))
524 /* Devno is valid. */
525 return cio_check_devno_blacklisted(sch
);
528 static int cio_validate_msg_subchannel(struct subchannel
*sch
)
530 /* Initialization for message subchannels. */
531 if (!css_sch_is_valid(&sch
->schib
))
534 /* Devno is valid. */
535 return cio_check_devno_blacklisted(sch
);
539 * cio_validate_subchannel - basic validation of subchannel
540 * @sch: subchannel structure to be filled out
541 * @schid: subchannel id
543 * Find out subchannel type and initialize struct subchannel.
546 * -ENXIO for non-defined subchannels
547 * -ENODEV for invalid subchannels or blacklisted devices
548 * -EIO for subchannels in an invalid subchannel set
550 int cio_validate_subchannel(struct subchannel
*sch
, struct subchannel_id schid
)
556 sprintf(dbf_txt
, "valsch%x", schid
.sch_no
);
557 CIO_TRACE_EVENT(4, dbf_txt
);
559 /* Nuke all fields. */
560 memset(sch
, 0, sizeof(struct subchannel
));
563 if (cio_is_console(schid
)) {
564 sch
->lock
= cio_get_console_lock();
566 err
= cio_create_sch_lock(sch
);
570 mutex_init(&sch
->reg_mutex
);
571 /* Set a name for the subchannel */
572 snprintf (sch
->dev
.bus_id
, BUS_ID_SIZE
, "0.%x.%04x", schid
.ssid
,
576 * The first subchannel that is not-operational (ccode==3)
577 * indicates that there aren't any more devices available.
578 * If stsch gets an exception, it means the current subchannel set
581 ccode
= stsch_err (schid
, &sch
->schib
);
583 err
= (ccode
== 3) ? -ENXIO
: ccode
;
586 /* Copy subchannel type from path management control word. */
587 sch
->st
= sch
->schib
.pmcw
.st
;
590 case SUBCHANNEL_TYPE_IO
:
591 err
= cio_validate_io_subchannel(sch
);
593 case SUBCHANNEL_TYPE_MSG
:
594 err
= cio_validate_msg_subchannel(sch
);
602 CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
603 sch
->schid
.ssid
, sch
->schid
.sch_no
, sch
->st
);
606 if (!cio_is_console(schid
))
613 * do_IRQ() handles all normal I/O device IRQ's (the special
614 * SMP cross-CPU interrupts have their own specific
619 do_IRQ (struct pt_regs
*regs
)
621 struct tpi_info
*tpi_info
;
622 struct subchannel
*sch
;
624 struct pt_regs
*old_regs
;
626 old_regs
= set_irq_regs(regs
);
629 if (S390_lowcore
.int_clock
>= S390_lowcore
.clock_comparator
)
630 /* Serve timer interrupts first. */
631 clock_comparator_work();
633 * Get interrupt information from lowcore
635 tpi_info
= (struct tpi_info
*) __LC_SUBCHANNEL_ID
;
636 irb
= (struct irb
*) __LC_IRB
;
638 kstat_cpu(smp_processor_id()).irqs
[IO_INTERRUPT
]++;
640 * Non I/O-subchannel thin interrupts are processed differently
642 if (tpi_info
->adapter_IO
== 1 &&
643 tpi_info
->int_type
== IO_INTERRUPT_TYPE
) {
647 sch
= (struct subchannel
*)(unsigned long)tpi_info
->intparm
;
649 /* Clear pending interrupt condition. */
650 tsch(tpi_info
->schid
, irb
);
653 spin_lock(sch
->lock
);
654 /* Store interrupt response block to lowcore. */
655 if (tsch(tpi_info
->schid
, irb
) == 0) {
656 /* Keep subchannel information word up to date. */
657 memcpy (&sch
->schib
.scsw
, &irb
->scsw
,
659 /* Call interrupt handler if there is one. */
660 if (sch
->driver
&& sch
->driver
->irq
)
661 sch
->driver
->irq(sch
);
663 spin_unlock(sch
->lock
);
665 * Are more interrupts pending?
666 * If so, the tpi instruction will update the lowcore
667 * to hold the info for the next interrupt.
668 * We don't do this for VM because a tpi drops the cpu
669 * out of the sie which costs more cycles than it saves.
671 } while (!MACHINE_IS_VM
&& tpi (NULL
) != 0);
673 set_irq_regs(old_regs
);
676 #ifdef CONFIG_CCW_CONSOLE
677 static struct subchannel console_subchannel
;
678 static struct io_subchannel_private console_priv
;
679 static int console_subchannel_in_use
;
681 void *cio_get_console_priv(void)
683 return &console_priv
;
687 * busy wait for the next interrupt on the console
689 void wait_cons_dev(void)
690 __releases(console_subchannel
.lock
)
691 __acquires(console_subchannel
.lock
)
693 unsigned long cr6
__attribute__ ((aligned (8)));
694 unsigned long save_cr6
__attribute__ ((aligned (8)));
697 * before entering the spinlock we may already have
698 * processed the interrupt on a different CPU...
700 if (!console_subchannel_in_use
)
703 /* disable all but the console isc */
704 __ctl_store (save_cr6
, 6, 6);
705 cr6
= 1UL << (31 - CONSOLE_ISC
);
706 __ctl_load (cr6
, 6, 6);
709 spin_unlock(console_subchannel
.lock
);
712 spin_lock(console_subchannel
.lock
);
713 } while (console_subchannel
.schib
.scsw
.cmd
.actl
!= 0);
715 * restore previous isc value
717 __ctl_load (save_cr6
, 6, 6);
721 cio_test_for_console(struct subchannel_id schid
, void *data
)
723 if (stsch_err(schid
, &console_subchannel
.schib
) != 0)
725 if ((console_subchannel
.schib
.pmcw
.st
== SUBCHANNEL_TYPE_IO
) &&
726 console_subchannel
.schib
.pmcw
.dnv
&&
727 (console_subchannel
.schib
.pmcw
.dev
== console_devno
)) {
728 console_irq
= schid
.sch_no
;
729 return 1; /* found */
736 cio_get_console_sch_no(void)
738 struct subchannel_id schid
;
740 init_subchannel_id(&schid
);
741 if (console_irq
!= -1) {
742 /* VM provided us with the irq number of the console. */
743 schid
.sch_no
= console_irq
;
744 if (stsch(schid
, &console_subchannel
.schib
) != 0 ||
745 (console_subchannel
.schib
.pmcw
.st
!= SUBCHANNEL_TYPE_IO
) ||
746 !console_subchannel
.schib
.pmcw
.dnv
)
748 console_devno
= console_subchannel
.schib
.pmcw
.dev
;
749 } else if (console_devno
!= -1) {
750 /* At least the console device number is known. */
751 for_each_subchannel(cio_test_for_console
, NULL
);
752 if (console_irq
== -1)
755 /* unlike in 2.4, we cannot autoprobe here, since
756 * the channel subsystem is not fully initialized.
757 * With some luck, the HWC console can take over */
758 printk(KERN_WARNING
"cio: No ccw console found!\n");
765 cio_probe_console(void)
768 struct subchannel_id schid
;
770 if (xchg(&console_subchannel_in_use
, 1) != 0)
771 return ERR_PTR(-EBUSY
);
772 sch_no
= cio_get_console_sch_no();
774 console_subchannel_in_use
= 0;
775 return ERR_PTR(-ENODEV
);
777 memset(&console_subchannel
, 0, sizeof(struct subchannel
));
778 init_subchannel_id(&schid
);
779 schid
.sch_no
= sch_no
;
780 ret
= cio_validate_subchannel(&console_subchannel
, schid
);
782 console_subchannel_in_use
= 0;
783 return ERR_PTR(-ENODEV
);
787 * enable console I/O-interrupt subclass
789 ctl_set_bit(6, 31 - CONSOLE_ISC
);
790 console_subchannel
.schib
.pmcw
.isc
= CONSOLE_ISC
;
791 console_subchannel
.schib
.pmcw
.intparm
=
792 (u32
)(addr_t
)&console_subchannel
;
793 ret
= cio_modify(&console_subchannel
);
795 console_subchannel_in_use
= 0;
798 return &console_subchannel
;
802 cio_release_console(void)
804 console_subchannel
.schib
.pmcw
.intparm
= 0;
805 cio_modify(&console_subchannel
);
806 ctl_clear_bit(6, 31 - CONSOLE_ISC
);
807 console_subchannel_in_use
= 0;
810 /* Bah... hack to catch console special sausages. */
812 cio_is_console(struct subchannel_id schid
)
814 if (!console_subchannel_in_use
)
816 return schid_equal(&schid
, &console_subchannel
.schid
);
820 cio_get_console_subchannel(void)
822 if (!console_subchannel_in_use
)
824 return &console_subchannel
;
829 __disable_subchannel_easy(struct subchannel_id schid
, struct schib
*schib
)
834 for (retry
=0;retry
<3;retry
++) {
836 cc
= msch(schid
, schib
);
838 return (cc
==3?-ENODEV
:-EBUSY
);
840 if (!schib
->pmcw
.ena
)
843 return -EBUSY
; /* uhm... */
846 /* we can't use the normal udelay here, since it enables external interrupts */
848 static void udelay_reset(unsigned long usecs
)
850 uint64_t start_cc
, end_cc
;
852 asm volatile ("STCK %0" : "=m" (start_cc
));
855 asm volatile ("STCK %0" : "=m" (end_cc
));
856 } while (((end_cc
- start_cc
)/4096) < usecs
);
860 __clear_io_subchannel_easy(struct subchannel_id schid
)
866 for (retry
=0;retry
<20;retry
++) {
870 tsch(ti
.schid
, (struct irb
*)__LC_IRB
);
871 if (schid_equal(&ti
.schid
, &schid
))
879 static int pgm_check_occured
;
881 static void cio_reset_pgm_check_handler(void)
883 pgm_check_occured
= 1;
886 static int stsch_reset(struct subchannel_id schid
, volatile struct schib
*addr
)
890 pgm_check_occured
= 0;
891 s390_base_pgm_handler_fn
= cio_reset_pgm_check_handler
;
892 rc
= stsch(schid
, addr
);
893 s390_base_pgm_handler_fn
= NULL
;
895 /* The program check handler could have changed pgm_check_occured. */
898 if (pgm_check_occured
)
904 static int __shutdown_subchannel_easy(struct subchannel_id schid
, void *data
)
908 if (stsch_reset(schid
, &schib
))
912 switch(__disable_subchannel_easy(schid
, &schib
)) {
916 default: /* -EBUSY */
917 switch (schib
.pmcw
.st
) {
918 case SUBCHANNEL_TYPE_IO
:
919 if (__clear_io_subchannel_easy(schid
))
920 goto out
; /* give up... */
923 /* No default clear strategy */
926 stsch(schid
, &schib
);
927 __disable_subchannel_easy(schid
, &schib
);
933 static atomic_t chpid_reset_count
;
935 static void s390_reset_chpids_mcck_handler(void)
940 /* Check for pending channel report word. */
941 mci
= (struct mci
*)&S390_lowcore
.mcck_interruption_code
;
944 /* Process channel report words. */
945 while (stcrw(&crw
) == 0) {
946 /* Check for responses to RCHP. */
947 if (crw
.slct
&& crw
.rsc
== CRW_RSC_CPATH
)
948 atomic_dec(&chpid_reset_count
);
952 #define RCHP_TIMEOUT (30 * USEC_PER_SEC)
953 static void css_reset(void)
956 unsigned long long timeout
;
959 /* Reset subchannels. */
960 for_each_subchannel(__shutdown_subchannel_easy
, NULL
);
961 /* Reset channel paths. */
962 s390_base_mcck_handler_fn
= s390_reset_chpids_mcck_handler
;
963 /* Enable channel report machine checks. */
964 __ctl_set_bit(14, 28);
965 /* Temporarily reenable machine checks. */
968 for (i
= 0; i
<= __MAX_CHPID
; i
++) {
971 if ((ret
== 0) || (ret
== 2))
973 * rchp either succeeded, or another rchp is already
974 * in progress. In either case, we'll get a crw.
976 atomic_inc(&chpid_reset_count
);
978 /* Wait for machine check for all channel paths. */
979 timeout
= get_clock() + (RCHP_TIMEOUT
<< 12);
980 while (atomic_read(&chpid_reset_count
) != 0) {
981 if (get_clock() > timeout
)
985 /* Disable machine checks again. */
986 local_mcck_disable();
987 /* Disable channel report machine checks. */
988 __ctl_clear_bit(14, 28);
989 s390_base_mcck_handler_fn
= NULL
;
992 static struct reset_call css_reset_call
= {
996 static int __init
init_css_reset_call(void)
998 atomic_set(&chpid_reset_count
, 0);
999 register_reset_call(&css_reset_call
);
1003 arch_initcall(init_css_reset_call
);
1005 struct sch_match_id
{
1006 struct subchannel_id schid
;
1007 struct ccw_dev_id devid
;
1011 static int __reipl_subchannel_match(struct subchannel_id schid
, void *data
)
1014 struct sch_match_id
*match_id
= data
;
1016 if (stsch_reset(schid
, &schib
))
1018 if ((schib
.pmcw
.st
== SUBCHANNEL_TYPE_IO
) && schib
.pmcw
.dnv
&&
1019 (schib
.pmcw
.dev
== match_id
->devid
.devno
) &&
1020 (schid
.ssid
== match_id
->devid
.ssid
)) {
1021 match_id
->schid
= schid
;
1028 static int reipl_find_schid(struct ccw_dev_id
*devid
,
1029 struct subchannel_id
*schid
)
1031 struct sch_match_id match_id
;
1033 match_id
.devid
= *devid
;
1034 match_id
.rc
= -ENODEV
;
1035 for_each_subchannel(__reipl_subchannel_match
, &match_id
);
1036 if (match_id
.rc
== 0)
1037 *schid
= match_id
.schid
;
1041 extern void do_reipl_asm(__u32 schid
);
1043 /* Make sure all subchannels are quiet before we re-ipl an lpar. */
1044 void reipl_ccw_dev(struct ccw_dev_id
*devid
)
1046 struct subchannel_id schid
;
1048 s390_reset_system();
1049 if (reipl_find_schid(devid
, &schid
) != 0)
1050 panic("IPL Device not found\n");
1051 do_reipl_asm(*((__u32
*)&schid
));
1054 int __init
cio_get_iplinfo(struct cio_iplinfo
*iplinfo
)
1056 struct subchannel_id schid
;
1059 schid
= *(struct subchannel_id
*)__LC_SUBCHANNEL_ID
;
1062 if (stsch(schid
, &schib
))
1064 if (schib
.pmcw
.st
!= SUBCHANNEL_TYPE_IO
)
1066 if (!schib
.pmcw
.dnv
)
1068 iplinfo
->devno
= schib
.pmcw
.dev
;
1069 iplinfo
->is_qdio
= schib
.pmcw
.qf
;
1074 * cio_tm_start_key - perform start function
1075 * @sch: subchannel on which to perform the start function
1076 * @tcw: transport-command word to be started
1077 * @lpm: mask of paths to use
1078 * @key: storage key to use for storage access
1080 * Start the tcw on the given subchannel. Return zero on success, non-zero
1083 int cio_tm_start_key(struct subchannel
*sch
, struct tcw
*tcw
, u8 lpm
, u8 key
)
1086 union orb
*orb
= &to_io_private(sch
)->orb
;
1088 memset(orb
, 0, sizeof(union orb
));
1089 orb
->tm
.intparm
= (u32
) (addr_t
) sch
;
1090 orb
->tm
.key
= key
>> 4;
1092 orb
->tm
.lpm
= lpm
? lpm
: sch
->lpm
;
1093 orb
->tm
.tcw
= (u32
) (addr_t
) tcw
;
1094 cc
= ssch(sch
->schid
, orb
);
1102 return cio_start_handle_notoper(sch
, lpm
);
1107 * cio_tm_intrg - perform interrogate function
1108 * @sch - subchannel on which to perform the interrogate function
1110 * If the specified subchannel is running in transport-mode, perform the
1111 * interrogate function. Return zero on success, non-zero otherwie.
1113 int cio_tm_intrg(struct subchannel
*sch
)
1117 if (!to_io_private(sch
)->orb
.tm
.b
)
1119 cc
= xsch(sch
->schid
);