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);