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>
21 #include <linux/irq.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 <linux/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
;
49 DEFINE_PER_CPU_ALIGNED(struct irb
, cio_irb
);
50 EXPORT_PER_CPU_SYMBOL(cio_irb
);
53 * Function: cio_debug_init
54 * Initializes three debug logs for common I/O:
55 * - cio_msg logs generic cio messages
56 * - cio_trace logs the calling of different functions
57 * - cio_crw logs machine check related cio messages
59 static int __init
cio_debug_init(void)
61 cio_debug_msg_id
= debug_register("cio_msg", 16, 1, 11 * sizeof(long));
62 if (!cio_debug_msg_id
)
64 debug_register_view(cio_debug_msg_id
, &debug_sprintf_view
);
65 debug_set_level(cio_debug_msg_id
, 2);
66 cio_debug_trace_id
= debug_register("cio_trace", 16, 1, 16);
67 if (!cio_debug_trace_id
)
69 debug_register_view(cio_debug_trace_id
, &debug_hex_ascii_view
);
70 debug_set_level(cio_debug_trace_id
, 2);
71 cio_debug_crw_id
= debug_register("cio_crw", 8, 1, 8 * sizeof(long));
72 if (!cio_debug_crw_id
)
74 debug_register_view(cio_debug_crw_id
, &debug_sprintf_view
);
75 debug_set_level(cio_debug_crw_id
, 4);
80 debug_unregister(cio_debug_msg_id
);
81 if (cio_debug_trace_id
)
82 debug_unregister(cio_debug_trace_id
);
84 debug_unregister(cio_debug_crw_id
);
88 arch_initcall (cio_debug_init
);
90 int cio_set_options(struct subchannel
*sch
, int flags
)
92 struct io_subchannel_private
*priv
= to_io_private(sch
);
94 priv
->options
.suspend
= (flags
& DOIO_ALLOW_SUSPEND
) != 0;
95 priv
->options
.prefetch
= (flags
& DOIO_DENY_PREFETCH
) != 0;
96 priv
->options
.inter
= (flags
& DOIO_SUPPRESS_INTER
) != 0;
101 cio_start_handle_notoper(struct subchannel
*sch
, __u8 lpm
)
110 CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
111 "subchannel 0.%x.%04x!\n", sch
->schid
.ssid
,
114 if (cio_update_schib(sch
))
117 sprintf(dbf_text
, "no%s", dev_name(&sch
->dev
));
118 CIO_TRACE_EVENT(0, dbf_text
);
119 CIO_HEX_EVENT(0, &sch
->schib
, sizeof (struct schib
));
121 return (sch
->lpm
? -EACCES
: -ENODEV
);
125 cio_start_key (struct subchannel
*sch
, /* subchannel structure */
126 struct ccw1
* cpa
, /* logical channel prog addr */
127 __u8 lpm
, /* logical path mask */
128 __u8 key
) /* storage key */
130 struct io_subchannel_private
*priv
= to_io_private(sch
);
131 union orb
*orb
= &priv
->orb
;
134 CIO_TRACE_EVENT(5, "stIO");
135 CIO_TRACE_EVENT(5, dev_name(&sch
->dev
));
137 memset(orb
, 0, sizeof(union orb
));
138 /* sch is always under 2G. */
139 orb
->cmd
.intparm
= (u32
)(addr_t
)sch
;
142 orb
->cmd
.pfch
= priv
->options
.prefetch
== 0;
143 orb
->cmd
.spnd
= priv
->options
.suspend
;
144 orb
->cmd
.ssic
= priv
->options
.suspend
&& priv
->options
.inter
;
145 orb
->cmd
.lpm
= (lpm
!= 0) ? lpm
: sch
->lpm
;
147 * for 64 bit we always support 64 bit IDAWs with 4k page size only
151 orb
->cmd
.key
= key
>> 4;
152 /* issue "Start Subchannel" */
153 orb
->cmd
.cpa
= (__u32
) __pa(cpa
);
154 ccode
= ssch(sch
->schid
, orb
);
156 /* process condition code */
157 CIO_HEX_EVENT(5, &ccode
, sizeof(ccode
));
162 * initialize device status information
164 sch
->schib
.scsw
.cmd
.actl
|= SCSW_ACTL_START_PEND
;
166 case 1: /* status pending */
169 case 3: /* device/path not operational */
170 return cio_start_handle_notoper(sch
, lpm
);
177 cio_start (struct subchannel
*sch
, struct ccw1
*cpa
, __u8 lpm
)
179 return cio_start_key(sch
, cpa
, lpm
, PAGE_DEFAULT_KEY
);
183 * resume suspended I/O operation
186 cio_resume (struct subchannel
*sch
)
190 CIO_TRACE_EVENT(4, "resIO");
191 CIO_TRACE_EVENT(4, dev_name(&sch
->dev
));
193 ccode
= rsch (sch
->schid
);
195 CIO_HEX_EVENT(4, &ccode
, sizeof(ccode
));
199 sch
->schib
.scsw
.cmd
.actl
|= SCSW_ACTL_RESUME_PEND
;
207 * useless to wait for request completion
208 * as device is no longer operational !
218 cio_halt(struct subchannel
*sch
)
225 CIO_TRACE_EVENT(2, "haltIO");
226 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
229 * Issue "Halt subchannel" and process condition code
231 ccode
= hsch (sch
->schid
);
233 CIO_HEX_EVENT(2, &ccode
, sizeof(ccode
));
237 sch
->schib
.scsw
.cmd
.actl
|= SCSW_ACTL_HALT_PEND
;
239 case 1: /* status pending */
242 default: /* device not operational */
248 * Clear I/O operation
251 cio_clear(struct subchannel
*sch
)
258 CIO_TRACE_EVENT(2, "clearIO");
259 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
262 * Issue "Clear subchannel" and process condition code
264 ccode
= csch (sch
->schid
);
266 CIO_HEX_EVENT(2, &ccode
, sizeof(ccode
));
270 sch
->schib
.scsw
.cmd
.actl
|= SCSW_ACTL_CLEAR_PEND
;
272 default: /* device not operational */
278 * Function: cio_cancel
279 * Issues a "Cancel Subchannel" on the specified subchannel
280 * Note: We don't need any fancy intparms and flags here
281 * since xsch is executed synchronously.
282 * Only for common I/O internal use as for now.
285 cio_cancel (struct subchannel
*sch
)
292 CIO_TRACE_EVENT(2, "cancelIO");
293 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
295 ccode
= xsch (sch
->schid
);
297 CIO_HEX_EVENT(2, &ccode
, sizeof(ccode
));
300 case 0: /* success */
301 /* Update information in scsw. */
302 if (cio_update_schib(sch
))
305 case 1: /* status pending */
307 case 2: /* not applicable */
309 default: /* not oper */
315 static void cio_apply_config(struct subchannel
*sch
, struct schib
*schib
)
317 schib
->pmcw
.intparm
= sch
->config
.intparm
;
318 schib
->pmcw
.mbi
= sch
->config
.mbi
;
319 schib
->pmcw
.isc
= sch
->config
.isc
;
320 schib
->pmcw
.ena
= sch
->config
.ena
;
321 schib
->pmcw
.mme
= sch
->config
.mme
;
322 schib
->pmcw
.mp
= sch
->config
.mp
;
323 schib
->pmcw
.csense
= sch
->config
.csense
;
324 schib
->pmcw
.mbfc
= sch
->config
.mbfc
;
325 if (sch
->config
.mbfc
)
326 schib
->mba
= sch
->config
.mba
;
329 static int cio_check_config(struct subchannel
*sch
, struct schib
*schib
)
331 return (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 (!sch
->config
.mbfc
|| (schib
->mba
== sch
->config
.mba
));
343 * cio_commit_config - apply configuration to the subchannel
345 int cio_commit_config(struct subchannel
*sch
)
347 int ccode
, retry
, ret
= 0;
351 if (stsch_err(sch
->schid
, &schib
) || !css_sch_is_valid(&schib
))
354 for (retry
= 0; retry
< 5; retry
++) {
355 /* copy desired changes to local schib */
356 cio_apply_config(sch
, &schib
);
357 ccode
= msch_err(sch
->schid
, &schib
);
358 if (ccode
< 0) /* -EIO if msch gets a program check. */
361 case 0: /* successful */
362 if (stsch_err(sch
->schid
, &schib
) ||
363 !css_sch_is_valid(&schib
))
365 if (cio_check_config(sch
, &schib
)) {
366 /* commit changes from local schib */
367 memcpy(&sch
->schib
, &schib
, sizeof(schib
));
372 case 1: /* status pending */
374 if (tsch(sch
->schid
, &irb
))
378 udelay(100); /* allow for recovery */
381 case 3: /* not operational */
389 * cio_update_schib - Perform stsch and update schib if subchannel is valid.
390 * @sch: subchannel on which to perform stsch
391 * Return zero on success, -ENODEV otherwise.
393 int cio_update_schib(struct subchannel
*sch
)
397 if (stsch_err(sch
->schid
, &schib
) || !css_sch_is_valid(&schib
))
400 memcpy(&sch
->schib
, &schib
, sizeof(schib
));
403 EXPORT_SYMBOL_GPL(cio_update_schib
);
406 * cio_enable_subchannel - enable a subchannel.
407 * @sch: subchannel to be enabled
408 * @intparm: interruption parameter to set
410 int cio_enable_subchannel(struct subchannel
*sch
, u32 intparm
)
414 CIO_TRACE_EVENT(2, "ensch");
415 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
417 if (sch_is_pseudo_sch(sch
))
419 if (cio_update_schib(sch
))
423 sch
->config
.isc
= sch
->isc
;
424 sch
->config
.intparm
= intparm
;
426 ret
= cio_commit_config(sch
);
429 * Got a program check in msch. Try without
430 * the concurrent sense bit the next time.
432 sch
->config
.csense
= 0;
433 ret
= cio_commit_config(sch
);
435 CIO_HEX_EVENT(2, &ret
, sizeof(ret
));
438 EXPORT_SYMBOL_GPL(cio_enable_subchannel
);
441 * cio_disable_subchannel - disable a subchannel.
442 * @sch: subchannel to disable
444 int cio_disable_subchannel(struct subchannel
*sch
)
448 CIO_TRACE_EVENT(2, "dissch");
449 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
451 if (sch_is_pseudo_sch(sch
))
453 if (cio_update_schib(sch
))
457 ret
= cio_commit_config(sch
);
459 CIO_HEX_EVENT(2, &ret
, sizeof(ret
));
462 EXPORT_SYMBOL_GPL(cio_disable_subchannel
);
464 static int cio_check_devno_blacklisted(struct subchannel
*sch
)
466 if (is_blacklisted(sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
)) {
468 * This device must not be known to Linux. So we simply
469 * say that there is no device and return ENODEV.
471 CIO_MSG_EVENT(6, "Blacklisted device detected "
472 "at devno %04X, subchannel set %x\n",
473 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
);
480 * cio_validate_subchannel - basic validation of subchannel
481 * @sch: subchannel structure to be filled out
482 * @schid: subchannel id
484 * Find out subchannel type and initialize struct subchannel.
487 * -ENXIO for non-defined subchannels
488 * -ENODEV for invalid subchannels or blacklisted devices
489 * -EIO for subchannels in an invalid subchannel set
491 int cio_validate_subchannel(struct subchannel
*sch
, struct subchannel_id schid
)
497 sprintf(dbf_txt
, "valsch%x", schid
.sch_no
);
498 CIO_TRACE_EVENT(4, dbf_txt
);
501 * The first subchannel that is not-operational (ccode==3)
502 * indicates that there aren't any more devices available.
503 * If stsch gets an exception, it means the current subchannel set
506 ccode
= stsch_err(schid
, &sch
->schib
);
508 err
= (ccode
== 3) ? -ENXIO
: ccode
;
511 sch
->st
= sch
->schib
.pmcw
.st
;
515 case SUBCHANNEL_TYPE_IO
:
516 case SUBCHANNEL_TYPE_MSG
:
517 if (!css_sch_is_valid(&sch
->schib
))
520 err
= cio_check_devno_blacklisted(sch
);
528 CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
529 sch
->schid
.ssid
, sch
->schid
.sch_no
, sch
->st
);
535 * do_cio_interrupt() handles all normal I/O device IRQ's
537 static irqreturn_t
do_cio_interrupt(int irq
, void *dummy
)
539 struct tpi_info
*tpi_info
;
540 struct subchannel
*sch
;
543 set_cpu_flag(CIF_NOHZ_DELAY
);
544 tpi_info
= (struct tpi_info
*) &get_irq_regs()->int_code
;
545 irb
= this_cpu_ptr(&cio_irb
);
546 sch
= (struct subchannel
*)(unsigned long) tpi_info
->intparm
;
548 /* Clear pending interrupt condition. */
549 inc_irq_stat(IRQIO_CIO
);
550 tsch(tpi_info
->schid
, irb
);
553 spin_lock(sch
->lock
);
554 /* Store interrupt response block to lowcore. */
555 if (tsch(tpi_info
->schid
, irb
) == 0) {
556 /* Keep subchannel information word up to date. */
557 memcpy (&sch
->schib
.scsw
, &irb
->scsw
, sizeof (irb
->scsw
));
558 /* Call interrupt handler if there is one. */
559 if (sch
->driver
&& sch
->driver
->irq
)
560 sch
->driver
->irq(sch
);
562 inc_irq_stat(IRQIO_CIO
);
564 inc_irq_stat(IRQIO_CIO
);
565 spin_unlock(sch
->lock
);
570 static struct irqaction io_interrupt
= {
572 .handler
= do_cio_interrupt
,
575 void __init
init_cio_interrupts(void)
577 irq_set_chip_and_handler(IO_INTERRUPT
,
578 &dummy_irq_chip
, handle_percpu_irq
);
579 setup_irq(IO_INTERRUPT
, &io_interrupt
);
582 #ifdef CONFIG_CCW_CONSOLE
583 static struct subchannel
*console_sch
;
584 static struct lock_class_key console_sch_key
;
587 * Use cio_tsch to update the subchannel status and call the interrupt handler
588 * if status had been pending. Called with the subchannel's lock held.
590 void cio_tsch(struct subchannel
*sch
)
595 irb
= this_cpu_ptr(&cio_irb
);
596 /* Store interrupt response block to lowcore. */
597 if (tsch(sch
->schid
, irb
) != 0)
598 /* Not status pending or not operational. */
600 memcpy(&sch
->schib
.scsw
, &irb
->scsw
, sizeof(union scsw
));
601 /* Call interrupt handler with updated status. */
602 irq_context
= in_interrupt();
607 kstat_incr_irq_this_cpu(IO_INTERRUPT
);
608 if (sch
->driver
&& sch
->driver
->irq
)
609 sch
->driver
->irq(sch
);
611 inc_irq_stat(IRQIO_CIO
);
618 static int cio_test_for_console(struct subchannel_id schid
, void *data
)
622 if (stsch_err(schid
, &schib
) != 0)
624 if ((schib
.pmcw
.st
== SUBCHANNEL_TYPE_IO
) && schib
.pmcw
.dnv
&&
625 (schib
.pmcw
.dev
== console_devno
)) {
626 console_irq
= schid
.sch_no
;
627 return 1; /* found */
632 static int cio_get_console_sch_no(void)
634 struct subchannel_id schid
;
637 init_subchannel_id(&schid
);
638 if (console_irq
!= -1) {
639 /* VM provided us with the irq number of the console. */
640 schid
.sch_no
= console_irq
;
641 if (stsch_err(schid
, &schib
) != 0 ||
642 (schib
.pmcw
.st
!= SUBCHANNEL_TYPE_IO
) || !schib
.pmcw
.dnv
)
644 console_devno
= schib
.pmcw
.dev
;
645 } else if (console_devno
!= -1) {
646 /* At least the console device number is known. */
647 for_each_subchannel(cio_test_for_console
, NULL
);
652 struct subchannel
*cio_probe_console(void)
654 struct subchannel_id schid
;
655 struct subchannel
*sch
;
658 sch_no
= cio_get_console_sch_no();
660 pr_warning("No CCW console was found\n");
661 return ERR_PTR(-ENODEV
);
663 init_subchannel_id(&schid
);
664 schid
.sch_no
= sch_no
;
665 sch
= css_alloc_subchannel(schid
);
669 lockdep_set_class(sch
->lock
, &console_sch_key
);
670 isc_register(CONSOLE_ISC
);
671 sch
->config
.isc
= CONSOLE_ISC
;
672 sch
->config
.intparm
= (u32
)(addr_t
)sch
;
673 ret
= cio_commit_config(sch
);
675 isc_unregister(CONSOLE_ISC
);
676 put_device(&sch
->dev
);
683 int cio_is_console(struct subchannel_id schid
)
687 return schid_equal(&schid
, &console_sch
->schid
);
690 void cio_register_early_subchannels(void)
697 ret
= css_register_subchannel(console_sch
);
699 put_device(&console_sch
->dev
);
701 #endif /* CONFIG_CCW_CONSOLE */
704 __disable_subchannel_easy(struct subchannel_id schid
, struct schib
*schib
)
709 for (retry
=0;retry
<3;retry
++) {
711 cc
= msch_err(schid
, schib
);
713 return (cc
==3?-ENODEV
:-EBUSY
);
714 if (stsch_err(schid
, schib
) || !css_sch_is_valid(schib
))
716 if (!schib
->pmcw
.ena
)
719 return -EBUSY
; /* uhm... */
723 __clear_io_subchannel_easy(struct subchannel_id schid
)
729 for (retry
=0;retry
<20;retry
++) {
733 tsch(ti
.schid
, this_cpu_ptr(&cio_irb
));
734 if (schid_equal(&ti
.schid
, &schid
))
742 static void __clear_chsc_subchannel_easy(void)
744 /* It seems we can only wait for a bit here :/ */
748 static int pgm_check_occured
;
750 static void cio_reset_pgm_check_handler(void)
752 pgm_check_occured
= 1;
755 static int stsch_reset(struct subchannel_id schid
, struct schib
*addr
)
759 pgm_check_occured
= 0;
760 s390_base_pgm_handler_fn
= cio_reset_pgm_check_handler
;
761 rc
= stsch_err(schid
, addr
);
762 s390_base_pgm_handler_fn
= NULL
;
764 /* The program check handler could have changed pgm_check_occured. */
767 if (pgm_check_occured
)
773 static int __shutdown_subchannel_easy(struct subchannel_id schid
, void *data
)
777 if (stsch_reset(schid
, &schib
))
781 switch(__disable_subchannel_easy(schid
, &schib
)) {
785 default: /* -EBUSY */
786 switch (schib
.pmcw
.st
) {
787 case SUBCHANNEL_TYPE_IO
:
788 if (__clear_io_subchannel_easy(schid
))
789 goto out
; /* give up... */
791 case SUBCHANNEL_TYPE_CHSC
:
792 __clear_chsc_subchannel_easy();
795 /* No default clear strategy */
798 stsch_err(schid
, &schib
);
799 __disable_subchannel_easy(schid
, &schib
);
805 static atomic_t chpid_reset_count
;
807 static void s390_reset_chpids_mcck_handler(void)
812 /* Check for pending channel report word. */
813 mci
.val
= S390_lowcore
.mcck_interruption_code
;
816 /* Process channel report words. */
817 while (stcrw(&crw
) == 0) {
818 /* Check for responses to RCHP. */
819 if (crw
.slct
&& crw
.rsc
== CRW_RSC_CPATH
)
820 atomic_dec(&chpid_reset_count
);
824 #define RCHP_TIMEOUT (30 * USEC_PER_SEC)
825 static void css_reset(void)
828 unsigned long long timeout
;
831 /* Reset subchannels. */
832 for_each_subchannel(__shutdown_subchannel_easy
, NULL
);
833 /* Reset channel paths. */
834 s390_base_mcck_handler_fn
= s390_reset_chpids_mcck_handler
;
835 /* Enable channel report machine checks. */
836 __ctl_set_bit(14, 28);
837 /* Temporarily reenable machine checks. */
840 for (i
= 0; i
<= __MAX_CHPID
; i
++) {
843 if ((ret
== 0) || (ret
== 2))
845 * rchp either succeeded, or another rchp is already
846 * in progress. In either case, we'll get a crw.
848 atomic_inc(&chpid_reset_count
);
850 /* Wait for machine check for all channel paths. */
851 timeout
= get_tod_clock_fast() + (RCHP_TIMEOUT
<< 12);
852 while (atomic_read(&chpid_reset_count
) != 0) {
853 if (get_tod_clock_fast() > timeout
)
857 /* Disable machine checks again. */
858 local_mcck_disable();
859 /* Disable channel report machine checks. */
860 __ctl_clear_bit(14, 28);
861 s390_base_mcck_handler_fn
= NULL
;
864 static struct reset_call css_reset_call
= {
868 static int __init
init_css_reset_call(void)
870 atomic_set(&chpid_reset_count
, 0);
871 register_reset_call(&css_reset_call
);
875 arch_initcall(init_css_reset_call
);
877 struct sch_match_id
{
878 struct subchannel_id schid
;
879 struct ccw_dev_id devid
;
883 static int __reipl_subchannel_match(struct subchannel_id schid
, void *data
)
886 struct sch_match_id
*match_id
= data
;
888 if (stsch_reset(schid
, &schib
))
890 if ((schib
.pmcw
.st
== SUBCHANNEL_TYPE_IO
) && schib
.pmcw
.dnv
&&
891 (schib
.pmcw
.dev
== match_id
->devid
.devno
) &&
892 (schid
.ssid
== match_id
->devid
.ssid
)) {
893 match_id
->schid
= schid
;
900 static int reipl_find_schid(struct ccw_dev_id
*devid
,
901 struct subchannel_id
*schid
)
903 struct sch_match_id match_id
;
905 match_id
.devid
= *devid
;
906 match_id
.rc
= -ENODEV
;
907 for_each_subchannel(__reipl_subchannel_match
, &match_id
);
908 if (match_id
.rc
== 0)
909 *schid
= match_id
.schid
;
913 extern void do_reipl_asm(__u32 schid
);
915 /* Make sure all subchannels are quiet before we re-ipl an lpar. */
916 void reipl_ccw_dev(struct ccw_dev_id
*devid
)
918 struct subchannel_id
uninitialized_var(schid
);
920 s390_reset_system(NULL
, NULL
, NULL
);
921 if (reipl_find_schid(devid
, &schid
) != 0)
922 panic("IPL Device not found\n");
923 do_reipl_asm(*((__u32
*)&schid
));
926 int __init
cio_get_iplinfo(struct cio_iplinfo
*iplinfo
)
928 struct subchannel_id schid
;
931 schid
= *(struct subchannel_id
*)&S390_lowcore
.subchannel_id
;
934 if (stsch_err(schid
, &schib
))
936 if (schib
.pmcw
.st
!= SUBCHANNEL_TYPE_IO
)
940 iplinfo
->devno
= schib
.pmcw
.dev
;
941 iplinfo
->is_qdio
= schib
.pmcw
.qf
;
946 * cio_tm_start_key - perform start function
947 * @sch: subchannel on which to perform the start function
948 * @tcw: transport-command word to be started
949 * @lpm: mask of paths to use
950 * @key: storage key to use for storage access
952 * Start the tcw on the given subchannel. Return zero on success, non-zero
955 int cio_tm_start_key(struct subchannel
*sch
, struct tcw
*tcw
, u8 lpm
, u8 key
)
958 union orb
*orb
= &to_io_private(sch
)->orb
;
960 memset(orb
, 0, sizeof(union orb
));
961 orb
->tm
.intparm
= (u32
) (addr_t
) sch
;
962 orb
->tm
.key
= key
>> 4;
964 orb
->tm
.lpm
= lpm
? lpm
: sch
->lpm
;
965 orb
->tm
.tcw
= (u32
) (addr_t
) tcw
;
966 cc
= ssch(sch
->schid
, orb
);
974 return cio_start_handle_notoper(sch
, lpm
);
979 * cio_tm_intrg - perform interrogate function
980 * @sch - subchannel on which to perform the interrogate function
982 * If the specified subchannel is running in transport-mode, perform the
983 * interrogate function. Return zero on success, non-zero otherwie.
985 int cio_tm_intrg(struct subchannel
*sch
)
989 if (!to_io_private(sch
)->orb
.tm
.b
)
991 cc
= xsch(sch
->schid
);