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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  *   S/390 common I/O routines -- low level i/o calls
0004  *
0005  *    Copyright IBM Corp. 1999, 2008
0006  *    Author(s): Ingo Adlung (adlung@de.ibm.com)
0007  *       Cornelia Huck (cornelia.huck@de.ibm.com)
0008  *       Arnd Bergmann (arndb@de.ibm.com)
0009  *       Martin Schwidefsky (schwidefsky@de.ibm.com)
0010  */
0011 
0012 #define KMSG_COMPONENT "cio"
0013 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
0014 
0015 #include <linux/ftrace.h>
0016 #include <linux/module.h>
0017 #include <linux/init.h>
0018 #include <linux/slab.h>
0019 #include <linux/device.h>
0020 #include <linux/kernel_stat.h>
0021 #include <linux/interrupt.h>
0022 #include <linux/irq.h>
0023 #include <asm/cio.h>
0024 #include <asm/delay.h>
0025 #include <asm/irq.h>
0026 #include <asm/irq_regs.h>
0027 #include <asm/setup.h>
0028 #include <asm/ipl.h>
0029 #include <asm/chpid.h>
0030 #include <asm/airq.h>
0031 #include <asm/isc.h>
0032 #include <linux/sched/cputime.h>
0033 #include <asm/fcx.h>
0034 #include <asm/nmi.h>
0035 #include <asm/crw.h>
0036 #include "cio.h"
0037 #include "css.h"
0038 #include "chsc.h"
0039 #include "ioasm.h"
0040 #include "io_sch.h"
0041 #include "blacklist.h"
0042 #include "cio_debug.h"
0043 #include "chp.h"
0044 #include "trace.h"
0045 
0046 debug_info_t *cio_debug_msg_id;
0047 debug_info_t *cio_debug_trace_id;
0048 debug_info_t *cio_debug_crw_id;
0049 
0050 DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb);
0051 EXPORT_PER_CPU_SYMBOL(cio_irb);
0052 
0053 /*
0054  * Function: cio_debug_init
0055  * Initializes three debug logs for common I/O:
0056  * - cio_msg logs generic cio messages
0057  * - cio_trace logs the calling of different functions
0058  * - cio_crw logs machine check related cio messages
0059  */
0060 static int __init cio_debug_init(void)
0061 {
0062     cio_debug_msg_id = debug_register("cio_msg", 16, 1, 11 * sizeof(long));
0063     if (!cio_debug_msg_id)
0064         goto out_unregister;
0065     debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
0066     debug_set_level(cio_debug_msg_id, 2);
0067     cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16);
0068     if (!cio_debug_trace_id)
0069         goto out_unregister;
0070     debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
0071     debug_set_level(cio_debug_trace_id, 2);
0072     cio_debug_crw_id = debug_register("cio_crw", 8, 1, 8 * sizeof(long));
0073     if (!cio_debug_crw_id)
0074         goto out_unregister;
0075     debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
0076     debug_set_level(cio_debug_crw_id, 4);
0077     return 0;
0078 
0079 out_unregister:
0080     debug_unregister(cio_debug_msg_id);
0081     debug_unregister(cio_debug_trace_id);
0082     debug_unregister(cio_debug_crw_id);
0083     return -1;
0084 }
0085 
0086 arch_initcall (cio_debug_init);
0087 
0088 int cio_set_options(struct subchannel *sch, int flags)
0089 {
0090     struct io_subchannel_private *priv = to_io_private(sch);
0091 
0092     priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0;
0093     priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0;
0094     priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0;
0095     return 0;
0096 }
0097 
0098 static int
0099 cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
0100 {
0101     char dbf_text[15];
0102 
0103     if (lpm != 0)
0104         sch->lpm &= ~lpm;
0105     else
0106         sch->lpm = 0;
0107 
0108     CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
0109               "subchannel 0.%x.%04x!\n", sch->schid.ssid,
0110               sch->schid.sch_no);
0111 
0112     if (cio_update_schib(sch))
0113         return -ENODEV;
0114 
0115     sprintf(dbf_text, "no%s", dev_name(&sch->dev));
0116     CIO_TRACE_EVENT(0, dbf_text);
0117     CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
0118 
0119     return (sch->lpm ? -EACCES : -ENODEV);
0120 }
0121 
0122 int
0123 cio_start_key (struct subchannel *sch,  /* subchannel structure */
0124            struct ccw1 * cpa,   /* logical channel prog addr */
0125            __u8 lpm,        /* logical path mask */
0126            __u8 key)                /* storage key */
0127 {
0128     struct io_subchannel_private *priv = to_io_private(sch);
0129     union orb *orb = &priv->orb;
0130     int ccode;
0131 
0132     CIO_TRACE_EVENT(5, "stIO");
0133     CIO_TRACE_EVENT(5, dev_name(&sch->dev));
0134 
0135     memset(orb, 0, sizeof(union orb));
0136     /* sch is always under 2G. */
0137     orb->cmd.intparm = (u32)(addr_t)sch;
0138     orb->cmd.fmt = 1;
0139 
0140     orb->cmd.pfch = priv->options.prefetch == 0;
0141     orb->cmd.spnd = priv->options.suspend;
0142     orb->cmd.ssic = priv->options.suspend && priv->options.inter;
0143     orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;
0144     /*
0145      * for 64 bit we always support 64 bit IDAWs with 4k page size only
0146      */
0147     orb->cmd.c64 = 1;
0148     orb->cmd.i2k = 0;
0149     orb->cmd.key = key >> 4;
0150     /* issue "Start Subchannel" */
0151     orb->cmd.cpa = (__u32) __pa(cpa);
0152     ccode = ssch(sch->schid, orb);
0153 
0154     /* process condition code */
0155     CIO_HEX_EVENT(5, &ccode, sizeof(ccode));
0156 
0157     switch (ccode) {
0158     case 0:
0159         /*
0160          * initialize device status information
0161          */
0162         sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
0163         return 0;
0164     case 1:     /* status pending */
0165     case 2:     /* busy */
0166         return -EBUSY;
0167     case 3:     /* device/path not operational */
0168         return cio_start_handle_notoper(sch, lpm);
0169     default:
0170         return ccode;
0171     }
0172 }
0173 EXPORT_SYMBOL_GPL(cio_start_key);
0174 
0175 int
0176 cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
0177 {
0178     return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
0179 }
0180 EXPORT_SYMBOL_GPL(cio_start);
0181 
0182 /*
0183  * resume suspended I/O operation
0184  */
0185 int
0186 cio_resume (struct subchannel *sch)
0187 {
0188     int ccode;
0189 
0190     CIO_TRACE_EVENT(4, "resIO");
0191     CIO_TRACE_EVENT(4, dev_name(&sch->dev));
0192 
0193     ccode = rsch (sch->schid);
0194 
0195     CIO_HEX_EVENT(4, &ccode, sizeof(ccode));
0196 
0197     switch (ccode) {
0198     case 0:
0199         sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;
0200         return 0;
0201     case 1:
0202         return -EBUSY;
0203     case 2:
0204         return -EINVAL;
0205     default:
0206         /*
0207          * useless to wait for request completion
0208          *  as device is no longer operational !
0209          */
0210         return -ENODEV;
0211     }
0212 }
0213 EXPORT_SYMBOL_GPL(cio_resume);
0214 
0215 /*
0216  * halt I/O operation
0217  */
0218 int
0219 cio_halt(struct subchannel *sch)
0220 {
0221     int ccode;
0222 
0223     if (!sch)
0224         return -ENODEV;
0225 
0226     CIO_TRACE_EVENT(2, "haltIO");
0227     CIO_TRACE_EVENT(2, dev_name(&sch->dev));
0228 
0229     /*
0230      * Issue "Halt subchannel" and process condition code
0231      */
0232     ccode = hsch (sch->schid);
0233 
0234     CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
0235 
0236     switch (ccode) {
0237     case 0:
0238         sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
0239         return 0;
0240     case 1:     /* status pending */
0241     case 2:     /* busy */
0242         return -EBUSY;
0243     default:        /* device not operational */
0244         return -ENODEV;
0245     }
0246 }
0247 EXPORT_SYMBOL_GPL(cio_halt);
0248 
0249 /*
0250  * Clear I/O operation
0251  */
0252 int
0253 cio_clear(struct subchannel *sch)
0254 {
0255     int ccode;
0256 
0257     if (!sch)
0258         return -ENODEV;
0259 
0260     CIO_TRACE_EVENT(2, "clearIO");
0261     CIO_TRACE_EVENT(2, dev_name(&sch->dev));
0262 
0263     /*
0264      * Issue "Clear subchannel" and process condition code
0265      */
0266     ccode = csch (sch->schid);
0267 
0268     CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
0269 
0270     switch (ccode) {
0271     case 0:
0272         sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;
0273         return 0;
0274     default:        /* device not operational */
0275         return -ENODEV;
0276     }
0277 }
0278 EXPORT_SYMBOL_GPL(cio_clear);
0279 
0280 /*
0281  * Function: cio_cancel
0282  * Issues a "Cancel Subchannel" on the specified subchannel
0283  * Note: We don't need any fancy intparms and flags here
0284  *   since xsch is executed synchronously.
0285  * Only for common I/O internal use as for now.
0286  */
0287 int
0288 cio_cancel (struct subchannel *sch)
0289 {
0290     int ccode;
0291 
0292     if (!sch)
0293         return -ENODEV;
0294 
0295     CIO_TRACE_EVENT(2, "cancelIO");
0296     CIO_TRACE_EVENT(2, dev_name(&sch->dev));
0297 
0298     ccode = xsch (sch->schid);
0299 
0300     CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
0301 
0302     switch (ccode) {
0303     case 0:     /* success */
0304         /* Update information in scsw. */
0305         if (cio_update_schib(sch))
0306             return -ENODEV;
0307         return 0;
0308     case 1:     /* status pending */
0309         return -EBUSY;
0310     case 2:     /* not applicable */
0311         return -EINVAL;
0312     default:    /* not oper */
0313         return -ENODEV;
0314     }
0315 }
0316 EXPORT_SYMBOL_GPL(cio_cancel);
0317 
0318 /**
0319  * cio_cancel_halt_clear - Cancel running I/O by performing cancel, halt
0320  * and clear ordinally if subchannel is valid.
0321  * @sch: subchannel on which to perform the cancel_halt_clear operation
0322  * @iretry: the number of the times remained to retry the next operation
0323  *
0324  * This should be called repeatedly since halt/clear are asynchronous
0325  * operations. We do one try with cio_cancel, three tries with cio_halt,
0326  * 255 tries with cio_clear. The caller should initialize @iretry with
0327  * the value 255 for its first call to this, and keep using the same
0328  * @iretry in the subsequent calls until it gets a non -EBUSY return.
0329  *
0330  * Returns 0 if device now idle, -ENODEV for device not operational,
0331  * -EBUSY if an interrupt is expected (either from halt/clear or from a
0332  * status pending), and -EIO if out of retries.
0333  */
0334 int cio_cancel_halt_clear(struct subchannel *sch, int *iretry)
0335 {
0336     int ret;
0337 
0338     if (cio_update_schib(sch))
0339         return -ENODEV;
0340     if (!sch->schib.pmcw.ena)
0341         /* Not operational -> done. */
0342         return 0;
0343     /* Stage 1: cancel io. */
0344     if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
0345         !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
0346         if (!scsw_is_tm(&sch->schib.scsw)) {
0347             ret = cio_cancel(sch);
0348             if (ret != -EINVAL)
0349                 return ret;
0350         }
0351         /*
0352          * Cancel io unsuccessful or not applicable (transport mode).
0353          * Continue with asynchronous instructions.
0354          */
0355         *iretry = 3;    /* 3 halt retries. */
0356     }
0357     /* Stage 2: halt io. */
0358     if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
0359         if (*iretry) {
0360             *iretry -= 1;
0361             ret = cio_halt(sch);
0362             if (ret != -EBUSY)
0363                 return (ret == 0) ? -EBUSY : ret;
0364         }
0365         /* Halt io unsuccessful. */
0366         *iretry = 255;  /* 255 clear retries. */
0367     }
0368     /* Stage 3: clear io. */
0369     if (*iretry) {
0370         *iretry -= 1;
0371         ret = cio_clear(sch);
0372         return (ret == 0) ? -EBUSY : ret;
0373     }
0374     /* Function was unsuccessful */
0375     return -EIO;
0376 }
0377 EXPORT_SYMBOL_GPL(cio_cancel_halt_clear);
0378 
0379 static void cio_apply_config(struct subchannel *sch, struct schib *schib)
0380 {
0381     schib->pmcw.intparm = sch->config.intparm;
0382     schib->pmcw.mbi = sch->config.mbi;
0383     schib->pmcw.isc = sch->config.isc;
0384     schib->pmcw.ena = sch->config.ena;
0385     schib->pmcw.mme = sch->config.mme;
0386     schib->pmcw.mp = sch->config.mp;
0387     schib->pmcw.csense = sch->config.csense;
0388     schib->pmcw.mbfc = sch->config.mbfc;
0389     if (sch->config.mbfc)
0390         schib->mba = sch->config.mba;
0391 }
0392 
0393 static int cio_check_config(struct subchannel *sch, struct schib *schib)
0394 {
0395     return (schib->pmcw.intparm == sch->config.intparm) &&
0396         (schib->pmcw.mbi == sch->config.mbi) &&
0397         (schib->pmcw.isc == sch->config.isc) &&
0398         (schib->pmcw.ena == sch->config.ena) &&
0399         (schib->pmcw.mme == sch->config.mme) &&
0400         (schib->pmcw.mp == sch->config.mp) &&
0401         (schib->pmcw.csense == sch->config.csense) &&
0402         (schib->pmcw.mbfc == sch->config.mbfc) &&
0403         (!sch->config.mbfc || (schib->mba == sch->config.mba));
0404 }
0405 
0406 /*
0407  * cio_commit_config - apply configuration to the subchannel
0408  */
0409 int cio_commit_config(struct subchannel *sch)
0410 {
0411     int ccode, retry, ret = 0;
0412     struct schib schib;
0413     struct irb irb;
0414 
0415     if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
0416         return -ENODEV;
0417 
0418     for (retry = 0; retry < 5; retry++) {
0419         /* copy desired changes to local schib */
0420         cio_apply_config(sch, &schib);
0421         ccode = msch(sch->schid, &schib);
0422         if (ccode < 0) /* -EIO if msch gets a program check. */
0423             return ccode;
0424         switch (ccode) {
0425         case 0: /* successful */
0426             if (stsch(sch->schid, &schib) ||
0427                 !css_sch_is_valid(&schib))
0428                 return -ENODEV;
0429             if (cio_check_config(sch, &schib)) {
0430                 /* commit changes from local schib */
0431                 memcpy(&sch->schib, &schib, sizeof(schib));
0432                 return 0;
0433             }
0434             ret = -EAGAIN;
0435             break;
0436         case 1: /* status pending */
0437             ret = -EBUSY;
0438             if (tsch(sch->schid, &irb))
0439                 return ret;
0440             break;
0441         case 2: /* busy */
0442             udelay(100); /* allow for recovery */
0443             ret = -EBUSY;
0444             break;
0445         case 3: /* not operational */
0446             return -ENODEV;
0447         }
0448     }
0449     return ret;
0450 }
0451 EXPORT_SYMBOL_GPL(cio_commit_config);
0452 
0453 /**
0454  * cio_update_schib - Perform stsch and update schib if subchannel is valid.
0455  * @sch: subchannel on which to perform stsch
0456  * Return zero on success, -ENODEV otherwise.
0457  */
0458 int cio_update_schib(struct subchannel *sch)
0459 {
0460     struct schib schib;
0461 
0462     if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
0463         return -ENODEV;
0464 
0465     memcpy(&sch->schib, &schib, sizeof(schib));
0466     return 0;
0467 }
0468 EXPORT_SYMBOL_GPL(cio_update_schib);
0469 
0470 /**
0471  * cio_enable_subchannel - enable a subchannel.
0472  * @sch: subchannel to be enabled
0473  * @intparm: interruption parameter to set
0474  */
0475 int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
0476 {
0477     int ret;
0478 
0479     CIO_TRACE_EVENT(2, "ensch");
0480     CIO_TRACE_EVENT(2, dev_name(&sch->dev));
0481 
0482     if (sch_is_pseudo_sch(sch))
0483         return -EINVAL;
0484     if (cio_update_schib(sch))
0485         return -ENODEV;
0486 
0487     sch->config.ena = 1;
0488     sch->config.isc = sch->isc;
0489     sch->config.intparm = intparm;
0490 
0491     ret = cio_commit_config(sch);
0492     if (ret == -EIO) {
0493         /*
0494          * Got a program check in msch. Try without
0495          * the concurrent sense bit the next time.
0496          */
0497         sch->config.csense = 0;
0498         ret = cio_commit_config(sch);
0499     }
0500     CIO_HEX_EVENT(2, &ret, sizeof(ret));
0501     return ret;
0502 }
0503 EXPORT_SYMBOL_GPL(cio_enable_subchannel);
0504 
0505 /**
0506  * cio_disable_subchannel - disable a subchannel.
0507  * @sch: subchannel to disable
0508  */
0509 int cio_disable_subchannel(struct subchannel *sch)
0510 {
0511     int ret;
0512 
0513     CIO_TRACE_EVENT(2, "dissch");
0514     CIO_TRACE_EVENT(2, dev_name(&sch->dev));
0515 
0516     if (sch_is_pseudo_sch(sch))
0517         return 0;
0518     if (cio_update_schib(sch))
0519         return -ENODEV;
0520 
0521     sch->config.ena = 0;
0522     ret = cio_commit_config(sch);
0523 
0524     CIO_HEX_EVENT(2, &ret, sizeof(ret));
0525     return ret;
0526 }
0527 EXPORT_SYMBOL_GPL(cio_disable_subchannel);
0528 
0529 /*
0530  * do_cio_interrupt() handles all normal I/O device IRQ's
0531  */
0532 static irqreturn_t do_cio_interrupt(int irq, void *dummy)
0533 {
0534     struct tpi_info *tpi_info;
0535     struct subchannel *sch;
0536     struct irb *irb;
0537 
0538     set_cpu_flag(CIF_NOHZ_DELAY);
0539     tpi_info = &get_irq_regs()->tpi_info;
0540     trace_s390_cio_interrupt(tpi_info);
0541     irb = this_cpu_ptr(&cio_irb);
0542     sch = (struct subchannel *)(unsigned long) tpi_info->intparm;
0543     if (!sch) {
0544         /* Clear pending interrupt condition. */
0545         inc_irq_stat(IRQIO_CIO);
0546         tsch(tpi_info->schid, irb);
0547         return IRQ_HANDLED;
0548     }
0549     spin_lock(sch->lock);
0550     /* Store interrupt response block to lowcore. */
0551     if (tsch(tpi_info->schid, irb) == 0) {
0552         /* Keep subchannel information word up to date. */
0553         memcpy (&sch->schib.scsw, &irb->scsw, sizeof (irb->scsw));
0554         /* Call interrupt handler if there is one. */
0555         if (sch->driver && sch->driver->irq)
0556             sch->driver->irq(sch);
0557         else
0558             inc_irq_stat(IRQIO_CIO);
0559     } else
0560         inc_irq_stat(IRQIO_CIO);
0561     spin_unlock(sch->lock);
0562 
0563     return IRQ_HANDLED;
0564 }
0565 
0566 void __init init_cio_interrupts(void)
0567 {
0568     irq_set_chip_and_handler(IO_INTERRUPT,
0569                  &dummy_irq_chip, handle_percpu_irq);
0570     if (request_irq(IO_INTERRUPT, do_cio_interrupt, 0, "I/O", NULL))
0571         panic("Failed to register I/O interrupt\n");
0572 }
0573 
0574 #ifdef CONFIG_CCW_CONSOLE
0575 static struct subchannel *console_sch;
0576 static struct lock_class_key console_sch_key;
0577 
0578 /*
0579  * Use cio_tsch to update the subchannel status and call the interrupt handler
0580  * if status had been pending. Called with the subchannel's lock held.
0581  */
0582 void cio_tsch(struct subchannel *sch)
0583 {
0584     struct irb *irb;
0585     int irq_context;
0586 
0587     irb = this_cpu_ptr(&cio_irb);
0588     /* Store interrupt response block to lowcore. */
0589     if (tsch(sch->schid, irb) != 0)
0590         /* Not status pending or not operational. */
0591         return;
0592     memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw));
0593     /* Call interrupt handler with updated status. */
0594     irq_context = in_interrupt();
0595     if (!irq_context) {
0596         local_bh_disable();
0597         irq_enter();
0598     }
0599     kstat_incr_irq_this_cpu(IO_INTERRUPT);
0600     if (sch->driver && sch->driver->irq)
0601         sch->driver->irq(sch);
0602     else
0603         inc_irq_stat(IRQIO_CIO);
0604     if (!irq_context) {
0605         irq_exit();
0606         _local_bh_enable();
0607     }
0608 }
0609 
0610 static int cio_test_for_console(struct subchannel_id schid, void *data)
0611 {
0612     struct schib schib;
0613 
0614     if (stsch(schid, &schib) != 0)
0615         return -ENXIO;
0616     if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
0617         (schib.pmcw.dev == console_devno)) {
0618         console_irq = schid.sch_no;
0619         return 1; /* found */
0620     }
0621     return 0;
0622 }
0623 
0624 static int cio_get_console_sch_no(void)
0625 {
0626     struct subchannel_id schid;
0627     struct schib schib;
0628 
0629     init_subchannel_id(&schid);
0630     if (console_irq != -1) {
0631         /* VM provided us with the irq number of the console. */
0632         schid.sch_no = console_irq;
0633         if (stsch(schid, &schib) != 0 ||
0634             (schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv)
0635             return -1;
0636         console_devno = schib.pmcw.dev;
0637     } else if (console_devno != -1) {
0638         /* At least the console device number is known. */
0639         for_each_subchannel(cio_test_for_console, NULL);
0640     }
0641     return console_irq;
0642 }
0643 
0644 struct subchannel *cio_probe_console(void)
0645 {
0646     struct subchannel_id schid;
0647     struct subchannel *sch;
0648     struct schib schib;
0649     int sch_no, ret;
0650 
0651     sch_no = cio_get_console_sch_no();
0652     if (sch_no == -1) {
0653         pr_warn("No CCW console was found\n");
0654         return ERR_PTR(-ENODEV);
0655     }
0656     init_subchannel_id(&schid);
0657     schid.sch_no = sch_no;
0658     ret = stsch(schid, &schib);
0659     if (ret)
0660         return ERR_PTR(-ENODEV);
0661 
0662     sch = css_alloc_subchannel(schid, &schib);
0663     if (IS_ERR(sch))
0664         return sch;
0665 
0666     lockdep_set_class(sch->lock, &console_sch_key);
0667     isc_register(CONSOLE_ISC);
0668     sch->config.isc = CONSOLE_ISC;
0669     sch->config.intparm = (u32)(addr_t)sch;
0670     ret = cio_commit_config(sch);
0671     if (ret) {
0672         isc_unregister(CONSOLE_ISC);
0673         put_device(&sch->dev);
0674         return ERR_PTR(ret);
0675     }
0676     console_sch = sch;
0677     return sch;
0678 }
0679 
0680 int cio_is_console(struct subchannel_id schid)
0681 {
0682     if (!console_sch)
0683         return 0;
0684     return schid_equal(&schid, &console_sch->schid);
0685 }
0686 
0687 void cio_register_early_subchannels(void)
0688 {
0689     int ret;
0690 
0691     if (!console_sch)
0692         return;
0693 
0694     ret = css_register_subchannel(console_sch);
0695     if (ret)
0696         put_device(&console_sch->dev);
0697 }
0698 #endif /* CONFIG_CCW_CONSOLE */
0699 
0700 /**
0701  * cio_tm_start_key - perform start function
0702  * @sch: subchannel on which to perform the start function
0703  * @tcw: transport-command word to be started
0704  * @lpm: mask of paths to use
0705  * @key: storage key to use for storage access
0706  *
0707  * Start the tcw on the given subchannel. Return zero on success, non-zero
0708  * otherwise.
0709  */
0710 int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key)
0711 {
0712     int cc;
0713     union orb *orb = &to_io_private(sch)->orb;
0714 
0715     memset(orb, 0, sizeof(union orb));
0716     orb->tm.intparm = (u32) (addr_t) sch;
0717     orb->tm.key = key >> 4;
0718     orb->tm.b = 1;
0719     orb->tm.lpm = lpm ? lpm : sch->lpm;
0720     orb->tm.tcw = (u32) (addr_t) tcw;
0721     cc = ssch(sch->schid, orb);
0722     switch (cc) {
0723     case 0:
0724         return 0;
0725     case 1:
0726     case 2:
0727         return -EBUSY;
0728     default:
0729         return cio_start_handle_notoper(sch, lpm);
0730     }
0731 }
0732 EXPORT_SYMBOL_GPL(cio_tm_start_key);
0733 
0734 /**
0735  * cio_tm_intrg - perform interrogate function
0736  * @sch: subchannel on which to perform the interrogate function
0737  *
0738  * If the specified subchannel is running in transport-mode, perform the
0739  * interrogate function. Return zero on success, non-zero otherwie.
0740  */
0741 int cio_tm_intrg(struct subchannel *sch)
0742 {
0743     int cc;
0744 
0745     if (!to_io_private(sch)->orb.tm.b)
0746         return -EINVAL;
0747     cc = xsch(sch->schid);
0748     switch (cc) {
0749     case 0:
0750     case 2:
0751         return 0;
0752     case 1:
0753         return -EBUSY;
0754     default:
0755         return -ENODEV;
0756     }
0757 }
0758 EXPORT_SYMBOL_GPL(cio_tm_intrg);
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