| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * S/390 common I/O routines -- low level i/o calls |
| * |
| * Copyright IBM Corp. 1999, 2008 |
| * Author(s): Ingo Adlung (adlung@de.ibm.com) |
| * Cornelia Huck (cornelia.huck@de.ibm.com) |
| * Arnd Bergmann (arndb@de.ibm.com) |
| * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| */ |
| |
| #define KMSG_COMPONENT "cio" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include <linux/ftrace.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/device.h> |
| #include <linux/kernel_stat.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| #include <asm/cio.h> |
| #include <asm/delay.h> |
| #include <asm/irq.h> |
| #include <asm/irq_regs.h> |
| #include <asm/setup.h> |
| #include <asm/ipl.h> |
| #include <asm/chpid.h> |
| #include <asm/airq.h> |
| #include <asm/isc.h> |
| #include <linux/sched/cputime.h> |
| #include <asm/fcx.h> |
| #include <asm/nmi.h> |
| #include <asm/crw.h> |
| #include "cio.h" |
| #include "css.h" |
| #include "chsc.h" |
| #include "ioasm.h" |
| #include "io_sch.h" |
| #include "blacklist.h" |
| #include "cio_debug.h" |
| #include "chp.h" |
| #include "trace.h" |
| |
| debug_info_t *cio_debug_msg_id; |
| debug_info_t *cio_debug_trace_id; |
| debug_info_t *cio_debug_crw_id; |
| |
| DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb); |
| EXPORT_PER_CPU_SYMBOL(cio_irb); |
| |
| /* |
| * Function: cio_debug_init |
| * Initializes three debug logs for common I/O: |
| * - cio_msg logs generic cio messages |
| * - cio_trace logs the calling of different functions |
| * - cio_crw logs machine check related cio messages |
| */ |
| static int __init cio_debug_init(void) |
| { |
| cio_debug_msg_id = debug_register("cio_msg", 16, 1, 11 * sizeof(long)); |
| if (!cio_debug_msg_id) |
| goto out_unregister; |
| debug_register_view(cio_debug_msg_id, &debug_sprintf_view); |
| debug_set_level(cio_debug_msg_id, 2); |
| cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); |
| if (!cio_debug_trace_id) |
| goto out_unregister; |
| debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); |
| debug_set_level(cio_debug_trace_id, 2); |
| cio_debug_crw_id = debug_register("cio_crw", 8, 1, 8 * sizeof(long)); |
| if (!cio_debug_crw_id) |
| goto out_unregister; |
| debug_register_view(cio_debug_crw_id, &debug_sprintf_view); |
| debug_set_level(cio_debug_crw_id, 4); |
| return 0; |
| |
| out_unregister: |
| debug_unregister(cio_debug_msg_id); |
| debug_unregister(cio_debug_trace_id); |
| debug_unregister(cio_debug_crw_id); |
| return -1; |
| } |
| |
| arch_initcall (cio_debug_init); |
| |
| int cio_set_options(struct subchannel *sch, int flags) |
| { |
| struct io_subchannel_private *priv = to_io_private(sch); |
| |
| priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; |
| priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; |
| priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; |
| return 0; |
| } |
| |
| static int |
| cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
| { |
| char dbf_text[15]; |
| |
| if (lpm != 0) |
| sch->lpm &= ~lpm; |
| else |
| sch->lpm = 0; |
| |
| CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " |
| "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
| sch->schid.sch_no); |
| |
| if (cio_update_schib(sch)) |
| return -ENODEV; |
| |
| sprintf(dbf_text, "no%s", dev_name(&sch->dev)); |
| CIO_TRACE_EVENT(0, dbf_text); |
| CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); |
| |
| return (sch->lpm ? -EACCES : -ENODEV); |
| } |
| |
| int |
| cio_start_key (struct subchannel *sch, /* subchannel structure */ |
| struct ccw1 * cpa, /* logical channel prog addr */ |
| __u8 lpm, /* logical path mask */ |
| __u8 key) /* storage key */ |
| { |
| struct io_subchannel_private *priv = to_io_private(sch); |
| union orb *orb = &priv->orb; |
| int ccode; |
| |
| CIO_TRACE_EVENT(5, "stIO"); |
| CIO_TRACE_EVENT(5, dev_name(&sch->dev)); |
| |
| memset(orb, 0, sizeof(union orb)); |
| /* sch is always under 2G. */ |
| orb->cmd.intparm = (u32)(addr_t)sch; |
| orb->cmd.fmt = 1; |
| |
| orb->cmd.pfch = priv->options.prefetch == 0; |
| orb->cmd.spnd = priv->options.suspend; |
| orb->cmd.ssic = priv->options.suspend && priv->options.inter; |
| orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm; |
| /* |
| * for 64 bit we always support 64 bit IDAWs with 4k page size only |
| */ |
| orb->cmd.c64 = 1; |
| orb->cmd.i2k = 0; |
| orb->cmd.key = key >> 4; |
| /* issue "Start Subchannel" */ |
| orb->cmd.cpa = (__u32) __pa(cpa); |
| ccode = ssch(sch->schid, orb); |
| |
| /* process condition code */ |
| CIO_HEX_EVENT(5, &ccode, sizeof(ccode)); |
| |
| switch (ccode) { |
| case 0: |
| /* |
| * initialize device status information |
| */ |
| sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; |
| return 0; |
| case 1: /* status pending */ |
| case 2: /* busy */ |
| return -EBUSY; |
| case 3: /* device/path not operational */ |
| return cio_start_handle_notoper(sch, lpm); |
| default: |
| return ccode; |
| } |
| } |
| EXPORT_SYMBOL_GPL(cio_start_key); |
| |
| int |
| cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) |
| { |
| return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
| } |
| EXPORT_SYMBOL_GPL(cio_start); |
| |
| /* |
| * resume suspended I/O operation |
| */ |
| int |
| cio_resume (struct subchannel *sch) |
| { |
| int ccode; |
| |
| CIO_TRACE_EVENT(4, "resIO"); |
| CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
| |
| ccode = rsch (sch->schid); |
| |
| CIO_HEX_EVENT(4, &ccode, sizeof(ccode)); |
| |
| switch (ccode) { |
| case 0: |
| sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; |
| return 0; |
| case 1: |
| return -EBUSY; |
| case 2: |
| return -EINVAL; |
| default: |
| /* |
| * useless to wait for request completion |
| * as device is no longer operational ! |
| */ |
| return -ENODEV; |
| } |
| } |
| EXPORT_SYMBOL_GPL(cio_resume); |
| |
| /* |
| * halt I/O operation |
| */ |
| int |
| cio_halt(struct subchannel *sch) |
| { |
| int ccode; |
| |
| if (!sch) |
| return -ENODEV; |
| |
| CIO_TRACE_EVENT(2, "haltIO"); |
| CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
| |
| /* |
| * Issue "Halt subchannel" and process condition code |
| */ |
| ccode = hsch (sch->schid); |
| |
| CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
| |
| switch (ccode) { |
| case 0: |
| sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; |
| return 0; |
| case 1: /* status pending */ |
| case 2: /* busy */ |
| return -EBUSY; |
| default: /* device not operational */ |
| return -ENODEV; |
| } |
| } |
| EXPORT_SYMBOL_GPL(cio_halt); |
| |
| /* |
| * Clear I/O operation |
| */ |
| int |
| cio_clear(struct subchannel *sch) |
| { |
| int ccode; |
| |
| if (!sch) |
| return -ENODEV; |
| |
| CIO_TRACE_EVENT(2, "clearIO"); |
| CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
| |
| /* |
| * Issue "Clear subchannel" and process condition code |
| */ |
| ccode = csch (sch->schid); |
| |
| CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
| |
| switch (ccode) { |
| case 0: |
| sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; |
| return 0; |
| default: /* device not operational */ |
| return -ENODEV; |
| } |
| } |
| EXPORT_SYMBOL_GPL(cio_clear); |
| |
| /* |
| * Function: cio_cancel |
| * Issues a "Cancel Subchannel" on the specified subchannel |
| * Note: We don't need any fancy intparms and flags here |
| * since xsch is executed synchronously. |
| * Only for common I/O internal use as for now. |
| */ |
| int |
| cio_cancel (struct subchannel *sch) |
| { |
| int ccode; |
| |
| if (!sch) |
| return -ENODEV; |
| |
| CIO_TRACE_EVENT(2, "cancelIO"); |
| CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
| |
| ccode = xsch (sch->schid); |
| |
| CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
| |
| switch (ccode) { |
| case 0: /* success */ |
| /* Update information in scsw. */ |
| if (cio_update_schib(sch)) |
| return -ENODEV; |
| return 0; |
| case 1: /* status pending */ |
| return -EBUSY; |
| case 2: /* not applicable */ |
| return -EINVAL; |
| default: /* not oper */ |
| return -ENODEV; |
| } |
| } |
| EXPORT_SYMBOL_GPL(cio_cancel); |
| |
| /** |
| * cio_cancel_halt_clear - Cancel running I/O by performing cancel, halt |
| * and clear ordinally if subchannel is valid. |
| * @sch: subchannel on which to perform the cancel_halt_clear operation |
| * @iretry: the number of the times remained to retry the next operation |
| * |
| * This should be called repeatedly since halt/clear are asynchronous |
| * operations. We do one try with cio_cancel, three tries with cio_halt, |
| * 255 tries with cio_clear. The caller should initialize @iretry with |
| * the value 255 for its first call to this, and keep using the same |
| * @iretry in the subsequent calls until it gets a non -EBUSY return. |
| * |
| * Returns 0 if device now idle, -ENODEV for device not operational, |
| * -EBUSY if an interrupt is expected (either from halt/clear or from a |
| * status pending), and -EIO if out of retries. |
| */ |
| int cio_cancel_halt_clear(struct subchannel *sch, int *iretry) |
| { |
| int ret; |
| |
| if (cio_update_schib(sch)) |
| return -ENODEV; |
| if (!sch->schib.pmcw.ena) |
| /* Not operational -> done. */ |
| return 0; |
| /* Stage 1: cancel io. */ |
| if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) && |
| !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { |
| if (!scsw_is_tm(&sch->schib.scsw)) { |
| ret = cio_cancel(sch); |
| if (ret != -EINVAL) |
| return ret; |
| } |
| /* |
| * Cancel io unsuccessful or not applicable (transport mode). |
| * Continue with asynchronous instructions. |
| */ |
| *iretry = 3; /* 3 halt retries. */ |
| } |
| /* Stage 2: halt io. */ |
| if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { |
| if (*iretry) { |
| *iretry -= 1; |
| ret = cio_halt(sch); |
| if (ret != -EBUSY) |
| return (ret == 0) ? -EBUSY : ret; |
| } |
| /* Halt io unsuccessful. */ |
| *iretry = 255; /* 255 clear retries. */ |
| } |
| /* Stage 3: clear io. */ |
| if (*iretry) { |
| *iretry -= 1; |
| ret = cio_clear(sch); |
| return (ret == 0) ? -EBUSY : ret; |
| } |
| /* Function was unsuccessful */ |
| return -EIO; |
| } |
| EXPORT_SYMBOL_GPL(cio_cancel_halt_clear); |
| |
| static void cio_apply_config(struct subchannel *sch, struct schib *schib) |
| { |
| schib->pmcw.intparm = sch->config.intparm; |
| schib->pmcw.mbi = sch->config.mbi; |
| schib->pmcw.isc = sch->config.isc; |
| schib->pmcw.ena = sch->config.ena; |
| schib->pmcw.mme = sch->config.mme; |
| schib->pmcw.mp = sch->config.mp; |
| schib->pmcw.csense = sch->config.csense; |
| schib->pmcw.mbfc = sch->config.mbfc; |
| if (sch->config.mbfc) |
| schib->mba = sch->config.mba; |
| } |
| |
| static int cio_check_config(struct subchannel *sch, struct schib *schib) |
| { |
| return (schib->pmcw.intparm == sch->config.intparm) && |
| (schib->pmcw.mbi == sch->config.mbi) && |
| (schib->pmcw.isc == sch->config.isc) && |
| (schib->pmcw.ena == sch->config.ena) && |
| (schib->pmcw.mme == sch->config.mme) && |
| (schib->pmcw.mp == sch->config.mp) && |
| (schib->pmcw.csense == sch->config.csense) && |
| (schib->pmcw.mbfc == sch->config.mbfc) && |
| (!sch->config.mbfc || (schib->mba == sch->config.mba)); |
| } |
| |
| /* |
| * cio_commit_config - apply configuration to the subchannel |
| */ |
| int cio_commit_config(struct subchannel *sch) |
| { |
| int ccode, retry, ret = 0; |
| struct schib schib; |
| struct irb irb; |
| |
| if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) |
| return -ENODEV; |
| |
| for (retry = 0; retry < 5; retry++) { |
| /* copy desired changes to local schib */ |
| cio_apply_config(sch, &schib); |
| ccode = msch(sch->schid, &schib); |
| if (ccode < 0) /* -EIO if msch gets a program check. */ |
| return ccode; |
| switch (ccode) { |
| case 0: /* successful */ |
| if (stsch(sch->schid, &schib) || |
| !css_sch_is_valid(&schib)) |
| return -ENODEV; |
| if (cio_check_config(sch, &schib)) { |
| /* commit changes from local schib */ |
| memcpy(&sch->schib, &schib, sizeof(schib)); |
| return 0; |
| } |
| ret = -EAGAIN; |
| break; |
| case 1: /* status pending */ |
| ret = -EBUSY; |
| if (tsch(sch->schid, &irb)) |
| return ret; |
| break; |
| case 2: /* busy */ |
| udelay(100); /* allow for recovery */ |
| ret = -EBUSY; |
| break; |
| case 3: /* not operational */ |
| return -ENODEV; |
| } |
| } |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(cio_commit_config); |
| |
| /** |
| * cio_update_schib - Perform stsch and update schib if subchannel is valid. |
| * @sch: subchannel on which to perform stsch |
| * Return zero on success, -ENODEV otherwise. |
| */ |
| int cio_update_schib(struct subchannel *sch) |
| { |
| struct schib schib; |
| |
| if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) |
| return -ENODEV; |
| |
| memcpy(&sch->schib, &schib, sizeof(schib)); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(cio_update_schib); |
| |
| /** |
| * cio_enable_subchannel - enable a subchannel. |
| * @sch: subchannel to be enabled |
| * @intparm: interruption parameter to set |
| */ |
| int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
| { |
| int ret; |
| |
| CIO_TRACE_EVENT(2, "ensch"); |
| CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
| |
| if (sch_is_pseudo_sch(sch)) |
| return -EINVAL; |
| if (cio_update_schib(sch)) |
| return -ENODEV; |
| |
| sch->config.ena = 1; |
| sch->config.isc = sch->isc; |
| sch->config.intparm = intparm; |
| |
| ret = cio_commit_config(sch); |
| if (ret == -EIO) { |
| /* |
| * Got a program check in msch. Try without |
| * the concurrent sense bit the next time. |
| */ |
| sch->config.csense = 0; |
| ret = cio_commit_config(sch); |
| } |
| CIO_HEX_EVENT(2, &ret, sizeof(ret)); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(cio_enable_subchannel); |
| |
| /** |
| * cio_disable_subchannel - disable a subchannel. |
| * @sch: subchannel to disable |
| */ |
| int cio_disable_subchannel(struct subchannel *sch) |
| { |
| int ret; |
| |
| CIO_TRACE_EVENT(2, "dissch"); |
| CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
| |
| if (sch_is_pseudo_sch(sch)) |
| return 0; |
| if (cio_update_schib(sch)) |
| return -ENODEV; |
| |
| sch->config.ena = 0; |
| ret = cio_commit_config(sch); |
| |
| CIO_HEX_EVENT(2, &ret, sizeof(ret)); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(cio_disable_subchannel); |
| |
| static int cio_check_devno_blacklisted(struct subchannel *sch) |
| { |
| if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { |
| /* |
| * This device must not be known to Linux. So we simply |
| * say that there is no device and return ENODEV. |
| */ |
| CIO_MSG_EVENT(6, "Blacklisted device detected " |
| "at devno %04X, subchannel set %x\n", |
| sch->schib.pmcw.dev, sch->schid.ssid); |
| return -ENODEV; |
| } |
| return 0; |
| } |
| |
| /** |
| * cio_validate_subchannel - basic validation of subchannel |
| * @sch: subchannel structure to be filled out |
| * @schid: subchannel id |
| * |
| * Find out subchannel type and initialize struct subchannel. |
| * Return codes: |
| * 0 on success |
| * -ENXIO for non-defined subchannels |
| * -ENODEV for invalid subchannels or blacklisted devices |
| * -EIO for subchannels in an invalid subchannel set |
| */ |
| int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
| { |
| char dbf_txt[15]; |
| int ccode; |
| int err; |
| |
| sprintf(dbf_txt, "valsch%x", schid.sch_no); |
| CIO_TRACE_EVENT(4, dbf_txt); |
| |
| /* |
| * The first subchannel that is not-operational (ccode==3) |
| * indicates that there aren't any more devices available. |
| * If stsch gets an exception, it means the current subchannel set |
| * is not valid. |
| */ |
| ccode = stsch(schid, &sch->schib); |
| if (ccode) { |
| err = (ccode == 3) ? -ENXIO : ccode; |
| goto out; |
| } |
| sch->st = sch->schib.pmcw.st; |
| sch->schid = schid; |
| |
| switch (sch->st) { |
| case SUBCHANNEL_TYPE_IO: |
| case SUBCHANNEL_TYPE_MSG: |
| if (!css_sch_is_valid(&sch->schib)) |
| err = -ENODEV; |
| else |
| err = cio_check_devno_blacklisted(sch); |
| break; |
| default: |
| err = 0; |
| } |
| if (err) |
| goto out; |
| |
| CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
| sch->schid.ssid, sch->schid.sch_no, sch->st); |
| out: |
| return err; |
| } |
| |
| /* |
| * do_cio_interrupt() handles all normal I/O device IRQ's |
| */ |
| static irqreturn_t do_cio_interrupt(int irq, void *dummy) |
| { |
| struct tpi_info *tpi_info; |
| struct subchannel *sch; |
| struct irb *irb; |
| |
| set_cpu_flag(CIF_NOHZ_DELAY); |
| tpi_info = (struct tpi_info *) &get_irq_regs()->int_code; |
| trace_s390_cio_interrupt(tpi_info); |
| irb = this_cpu_ptr(&cio_irb); |
| sch = (struct subchannel *)(unsigned long) tpi_info->intparm; |
| if (!sch) { |
| /* Clear pending interrupt condition. */ |
| inc_irq_stat(IRQIO_CIO); |
| tsch(tpi_info->schid, irb); |
| return IRQ_HANDLED; |
| } |
| spin_lock(sch->lock); |
| /* Store interrupt response block to lowcore. */ |
| if (tsch(tpi_info->schid, irb) == 0) { |
| /* Keep subchannel information word up to date. */ |
| memcpy (&sch->schib.scsw, &irb->scsw, sizeof (irb->scsw)); |
| /* Call interrupt handler if there is one. */ |
| if (sch->driver && sch->driver->irq) |
| sch->driver->irq(sch); |
| else |
| inc_irq_stat(IRQIO_CIO); |
| } else |
| inc_irq_stat(IRQIO_CIO); |
| spin_unlock(sch->lock); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static struct irqaction io_interrupt = { |
| .name = "IO", |
| .handler = do_cio_interrupt, |
| }; |
| |
| void __init init_cio_interrupts(void) |
| { |
| irq_set_chip_and_handler(IO_INTERRUPT, |
| &dummy_irq_chip, handle_percpu_irq); |
| setup_irq(IO_INTERRUPT, &io_interrupt); |
| } |
| |
| #ifdef CONFIG_CCW_CONSOLE |
| static struct subchannel *console_sch; |
| static struct lock_class_key console_sch_key; |
| |
| /* |
| * Use cio_tsch to update the subchannel status and call the interrupt handler |
| * if status had been pending. Called with the subchannel's lock held. |
| */ |
| void cio_tsch(struct subchannel *sch) |
| { |
| struct irb *irb; |
| int irq_context; |
| |
| irb = this_cpu_ptr(&cio_irb); |
| /* Store interrupt response block to lowcore. */ |
| if (tsch(sch->schid, irb) != 0) |
| /* Not status pending or not operational. */ |
| return; |
| memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); |
| /* Call interrupt handler with updated status. */ |
| irq_context = in_interrupt(); |
| if (!irq_context) { |
| local_bh_disable(); |
| irq_enter(); |
| } |
| kstat_incr_irq_this_cpu(IO_INTERRUPT); |
| if (sch->driver && sch->driver->irq) |
| sch->driver->irq(sch); |
| else |
| inc_irq_stat(IRQIO_CIO); |
| if (!irq_context) { |
| irq_exit(); |
| _local_bh_enable(); |
| } |
| } |
| |
| static int cio_test_for_console(struct subchannel_id schid, void *data) |
| { |
| struct schib schib; |
| |
| if (stsch(schid, &schib) != 0) |
| return -ENXIO; |
| if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
| (schib.pmcw.dev == console_devno)) { |
| console_irq = schid.sch_no; |
| return 1; /* found */ |
| } |
| return 0; |
| } |
| |
| static int cio_get_console_sch_no(void) |
| { |
| struct subchannel_id schid; |
| struct schib schib; |
| |
| init_subchannel_id(&schid); |
| if (console_irq != -1) { |
| /* VM provided us with the irq number of the console. */ |
| schid.sch_no = console_irq; |
| if (stsch(schid, &schib) != 0 || |
| (schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv) |
| return -1; |
| console_devno = schib.pmcw.dev; |
| } else if (console_devno != -1) { |
| /* At least the console device number is known. */ |
| for_each_subchannel(cio_test_for_console, NULL); |
| } |
| return console_irq; |
| } |
| |
| struct subchannel *cio_probe_console(void) |
| { |
| struct subchannel_id schid; |
| struct subchannel *sch; |
| int sch_no, ret; |
| |
| sch_no = cio_get_console_sch_no(); |
| if (sch_no == -1) { |
| pr_warn("No CCW console was found\n"); |
| return ERR_PTR(-ENODEV); |
| } |
| init_subchannel_id(&schid); |
| schid.sch_no = sch_no; |
| sch = css_alloc_subchannel(schid); |
| if (IS_ERR(sch)) |
| return sch; |
| |
| lockdep_set_class(sch->lock, &console_sch_key); |
| isc_register(CONSOLE_ISC); |
| sch->config.isc = CONSOLE_ISC; |
| sch->config.intparm = (u32)(addr_t)sch; |
| ret = cio_commit_config(sch); |
| if (ret) { |
| isc_unregister(CONSOLE_ISC); |
| put_device(&sch->dev); |
| return ERR_PTR(ret); |
| } |
| console_sch = sch; |
| return sch; |
| } |
| |
| int cio_is_console(struct subchannel_id schid) |
| { |
| if (!console_sch) |
| return 0; |
| return schid_equal(&schid, &console_sch->schid); |
| } |
| |
| void cio_register_early_subchannels(void) |
| { |
| int ret; |
| |
| if (!console_sch) |
| return; |
| |
| ret = css_register_subchannel(console_sch); |
| if (ret) |
| put_device(&console_sch->dev); |
| } |
| #endif /* CONFIG_CCW_CONSOLE */ |
| |
| /** |
| * cio_tm_start_key - perform start function |
| * @sch: subchannel on which to perform the start function |
| * @tcw: transport-command word to be started |
| * @lpm: mask of paths to use |
| * @key: storage key to use for storage access |
| * |
| * Start the tcw on the given subchannel. Return zero on success, non-zero |
| * otherwise. |
| */ |
| int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) |
| { |
| int cc; |
| union orb *orb = &to_io_private(sch)->orb; |
| |
| memset(orb, 0, sizeof(union orb)); |
| orb->tm.intparm = (u32) (addr_t) sch; |
| orb->tm.key = key >> 4; |
| orb->tm.b = 1; |
| orb->tm.lpm = lpm ? lpm : sch->lpm; |
| orb->tm.tcw = (u32) (addr_t) tcw; |
| cc = ssch(sch->schid, orb); |
| switch (cc) { |
| case 0: |
| return 0; |
| case 1: |
| case 2: |
| return -EBUSY; |
| default: |
| return cio_start_handle_notoper(sch, lpm); |
| } |
| } |
| EXPORT_SYMBOL_GPL(cio_tm_start_key); |
| |
| /** |
| * cio_tm_intrg - perform interrogate function |
| * @sch: subchannel on which to perform the interrogate function |
| * |
| * If the specified subchannel is running in transport-mode, perform the |
| * interrogate function. Return zero on success, non-zero otherwie. |
| */ |
| int cio_tm_intrg(struct subchannel *sch) |
| { |
| int cc; |
| |
| if (!to_io_private(sch)->orb.tm.b) |
| return -EINVAL; |
| cc = xsch(sch->schid); |
| switch (cc) { |
| case 0: |
| case 2: |
| return 0; |
| case 1: |
| return -EBUSY; |
| default: |
| return -ENODEV; |
| } |
| } |
| EXPORT_SYMBOL_GPL(cio_tm_intrg); |