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34bbeed074
To avoid casting ptrace members, add a union containing both struct tpi_info and explicit int_code/int_parm members. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
759 lines
18 KiB
C
759 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* S/390 common I/O routines -- low level i/o calls
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*
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* Copyright IBM Corp. 1999, 2008
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* Author(s): Ingo Adlung (adlung@de.ibm.com)
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* Cornelia Huck (cornelia.huck@de.ibm.com)
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* Arnd Bergmann (arndb@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#define KMSG_COMPONENT "cio"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/ftrace.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/kernel_stat.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <asm/cio.h>
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#include <asm/delay.h>
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#include <asm/irq.h>
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#include <asm/irq_regs.h>
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#include <asm/setup.h>
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#include <asm/ipl.h>
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#include <asm/chpid.h>
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#include <asm/airq.h>
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#include <asm/isc.h>
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#include <linux/sched/cputime.h>
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#include <asm/fcx.h>
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#include <asm/nmi.h>
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#include <asm/crw.h>
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#include "cio.h"
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#include "css.h"
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#include "chsc.h"
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#include "ioasm.h"
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#include "io_sch.h"
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#include "blacklist.h"
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#include "cio_debug.h"
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#include "chp.h"
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#include "trace.h"
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debug_info_t *cio_debug_msg_id;
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debug_info_t *cio_debug_trace_id;
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debug_info_t *cio_debug_crw_id;
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DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb);
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EXPORT_PER_CPU_SYMBOL(cio_irb);
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/*
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* Function: cio_debug_init
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* Initializes three debug logs for common I/O:
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* - cio_msg logs generic cio messages
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* - cio_trace logs the calling of different functions
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* - cio_crw logs machine check related cio messages
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*/
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static int __init cio_debug_init(void)
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{
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cio_debug_msg_id = debug_register("cio_msg", 16, 1, 11 * sizeof(long));
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if (!cio_debug_msg_id)
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goto out_unregister;
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debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
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debug_set_level(cio_debug_msg_id, 2);
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cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16);
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if (!cio_debug_trace_id)
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goto out_unregister;
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debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
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debug_set_level(cio_debug_trace_id, 2);
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cio_debug_crw_id = debug_register("cio_crw", 8, 1, 8 * sizeof(long));
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if (!cio_debug_crw_id)
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goto out_unregister;
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debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
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debug_set_level(cio_debug_crw_id, 4);
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return 0;
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out_unregister:
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debug_unregister(cio_debug_msg_id);
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debug_unregister(cio_debug_trace_id);
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debug_unregister(cio_debug_crw_id);
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return -1;
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}
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arch_initcall (cio_debug_init);
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int cio_set_options(struct subchannel *sch, int flags)
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{
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struct io_subchannel_private *priv = to_io_private(sch);
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priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0;
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priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0;
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priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0;
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return 0;
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}
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static int
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cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
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{
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char dbf_text[15];
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if (lpm != 0)
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sch->lpm &= ~lpm;
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else
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sch->lpm = 0;
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CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
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"subchannel 0.%x.%04x!\n", sch->schid.ssid,
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sch->schid.sch_no);
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if (cio_update_schib(sch))
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return -ENODEV;
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sprintf(dbf_text, "no%s", dev_name(&sch->dev));
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CIO_TRACE_EVENT(0, dbf_text);
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CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
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return (sch->lpm ? -EACCES : -ENODEV);
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}
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int
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cio_start_key (struct subchannel *sch, /* subchannel structure */
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struct ccw1 * cpa, /* logical channel prog addr */
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__u8 lpm, /* logical path mask */
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__u8 key) /* storage key */
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{
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struct io_subchannel_private *priv = to_io_private(sch);
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union orb *orb = &priv->orb;
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int ccode;
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CIO_TRACE_EVENT(5, "stIO");
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CIO_TRACE_EVENT(5, dev_name(&sch->dev));
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memset(orb, 0, sizeof(union orb));
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/* sch is always under 2G. */
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orb->cmd.intparm = (u32)(addr_t)sch;
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orb->cmd.fmt = 1;
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orb->cmd.pfch = priv->options.prefetch == 0;
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orb->cmd.spnd = priv->options.suspend;
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orb->cmd.ssic = priv->options.suspend && priv->options.inter;
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orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;
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/*
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* for 64 bit we always support 64 bit IDAWs with 4k page size only
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*/
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orb->cmd.c64 = 1;
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orb->cmd.i2k = 0;
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orb->cmd.key = key >> 4;
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/* issue "Start Subchannel" */
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orb->cmd.cpa = (__u32) __pa(cpa);
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ccode = ssch(sch->schid, orb);
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/* process condition code */
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CIO_HEX_EVENT(5, &ccode, sizeof(ccode));
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switch (ccode) {
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case 0:
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/*
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* initialize device status information
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*/
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sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
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return 0;
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case 1: /* status pending */
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case 2: /* busy */
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return -EBUSY;
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case 3: /* device/path not operational */
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return cio_start_handle_notoper(sch, lpm);
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default:
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return ccode;
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}
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}
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EXPORT_SYMBOL_GPL(cio_start_key);
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int
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cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
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{
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return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
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}
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EXPORT_SYMBOL_GPL(cio_start);
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/*
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* resume suspended I/O operation
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*/
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int
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cio_resume (struct subchannel *sch)
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{
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int ccode;
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CIO_TRACE_EVENT(4, "resIO");
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CIO_TRACE_EVENT(4, dev_name(&sch->dev));
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ccode = rsch (sch->schid);
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CIO_HEX_EVENT(4, &ccode, sizeof(ccode));
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switch (ccode) {
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case 0:
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sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;
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return 0;
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case 1:
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return -EBUSY;
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case 2:
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return -EINVAL;
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default:
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/*
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* useless to wait for request completion
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* as device is no longer operational !
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*/
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return -ENODEV;
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}
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}
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EXPORT_SYMBOL_GPL(cio_resume);
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/*
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* halt I/O operation
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*/
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int
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cio_halt(struct subchannel *sch)
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{
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int ccode;
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if (!sch)
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return -ENODEV;
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CIO_TRACE_EVENT(2, "haltIO");
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CIO_TRACE_EVENT(2, dev_name(&sch->dev));
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/*
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* Issue "Halt subchannel" and process condition code
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*/
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ccode = hsch (sch->schid);
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CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
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switch (ccode) {
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case 0:
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sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
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return 0;
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case 1: /* status pending */
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case 2: /* busy */
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return -EBUSY;
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default: /* device not operational */
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return -ENODEV;
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}
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}
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EXPORT_SYMBOL_GPL(cio_halt);
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/*
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* Clear I/O operation
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*/
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int
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cio_clear(struct subchannel *sch)
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{
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int ccode;
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if (!sch)
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return -ENODEV;
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CIO_TRACE_EVENT(2, "clearIO");
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CIO_TRACE_EVENT(2, dev_name(&sch->dev));
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/*
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* Issue "Clear subchannel" and process condition code
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*/
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ccode = csch (sch->schid);
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CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
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switch (ccode) {
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case 0:
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sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;
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return 0;
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default: /* device not operational */
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return -ENODEV;
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}
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}
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EXPORT_SYMBOL_GPL(cio_clear);
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/*
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* Function: cio_cancel
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* Issues a "Cancel Subchannel" on the specified subchannel
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* Note: We don't need any fancy intparms and flags here
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* since xsch is executed synchronously.
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* Only for common I/O internal use as for now.
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*/
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int
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cio_cancel (struct subchannel *sch)
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{
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int ccode;
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if (!sch)
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return -ENODEV;
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CIO_TRACE_EVENT(2, "cancelIO");
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CIO_TRACE_EVENT(2, dev_name(&sch->dev));
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ccode = xsch (sch->schid);
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CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
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switch (ccode) {
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case 0: /* success */
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/* Update information in scsw. */
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if (cio_update_schib(sch))
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return -ENODEV;
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return 0;
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case 1: /* status pending */
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return -EBUSY;
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case 2: /* not applicable */
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return -EINVAL;
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default: /* not oper */
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return -ENODEV;
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}
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}
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EXPORT_SYMBOL_GPL(cio_cancel);
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/**
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* cio_cancel_halt_clear - Cancel running I/O by performing cancel, halt
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* and clear ordinally if subchannel is valid.
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* @sch: subchannel on which to perform the cancel_halt_clear operation
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* @iretry: the number of the times remained to retry the next operation
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*
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* This should be called repeatedly since halt/clear are asynchronous
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* operations. We do one try with cio_cancel, three tries with cio_halt,
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* 255 tries with cio_clear. The caller should initialize @iretry with
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* the value 255 for its first call to this, and keep using the same
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* @iretry in the subsequent calls until it gets a non -EBUSY return.
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*
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* Returns 0 if device now idle, -ENODEV for device not operational,
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* -EBUSY if an interrupt is expected (either from halt/clear or from a
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* status pending), and -EIO if out of retries.
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*/
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int cio_cancel_halt_clear(struct subchannel *sch, int *iretry)
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{
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int ret;
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if (cio_update_schib(sch))
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return -ENODEV;
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if (!sch->schib.pmcw.ena)
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/* Not operational -> done. */
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return 0;
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/* Stage 1: cancel io. */
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if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
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!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
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if (!scsw_is_tm(&sch->schib.scsw)) {
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ret = cio_cancel(sch);
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if (ret != -EINVAL)
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return ret;
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}
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/*
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* Cancel io unsuccessful or not applicable (transport mode).
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* Continue with asynchronous instructions.
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*/
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*iretry = 3; /* 3 halt retries. */
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}
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/* Stage 2: halt io. */
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if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
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if (*iretry) {
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*iretry -= 1;
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ret = cio_halt(sch);
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if (ret != -EBUSY)
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return (ret == 0) ? -EBUSY : ret;
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}
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/* Halt io unsuccessful. */
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*iretry = 255; /* 255 clear retries. */
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}
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/* Stage 3: clear io. */
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if (*iretry) {
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*iretry -= 1;
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ret = cio_clear(sch);
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return (ret == 0) ? -EBUSY : ret;
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}
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/* Function was unsuccessful */
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return -EIO;
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}
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EXPORT_SYMBOL_GPL(cio_cancel_halt_clear);
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static void cio_apply_config(struct subchannel *sch, struct schib *schib)
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{
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schib->pmcw.intparm = sch->config.intparm;
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schib->pmcw.mbi = sch->config.mbi;
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schib->pmcw.isc = sch->config.isc;
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schib->pmcw.ena = sch->config.ena;
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schib->pmcw.mme = sch->config.mme;
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schib->pmcw.mp = sch->config.mp;
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schib->pmcw.csense = sch->config.csense;
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schib->pmcw.mbfc = sch->config.mbfc;
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if (sch->config.mbfc)
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schib->mba = sch->config.mba;
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}
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static int cio_check_config(struct subchannel *sch, struct schib *schib)
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{
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return (schib->pmcw.intparm == sch->config.intparm) &&
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(schib->pmcw.mbi == sch->config.mbi) &&
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(schib->pmcw.isc == sch->config.isc) &&
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(schib->pmcw.ena == sch->config.ena) &&
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(schib->pmcw.mme == sch->config.mme) &&
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(schib->pmcw.mp == sch->config.mp) &&
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(schib->pmcw.csense == sch->config.csense) &&
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(schib->pmcw.mbfc == sch->config.mbfc) &&
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(!sch->config.mbfc || (schib->mba == sch->config.mba));
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}
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/*
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* cio_commit_config - apply configuration to the subchannel
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*/
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int cio_commit_config(struct subchannel *sch)
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{
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int ccode, retry, ret = 0;
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struct schib schib;
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struct irb irb;
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if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
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return -ENODEV;
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for (retry = 0; retry < 5; retry++) {
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/* copy desired changes to local schib */
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cio_apply_config(sch, &schib);
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ccode = msch(sch->schid, &schib);
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if (ccode < 0) /* -EIO if msch gets a program check. */
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return ccode;
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switch (ccode) {
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case 0: /* successful */
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if (stsch(sch->schid, &schib) ||
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!css_sch_is_valid(&schib))
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return -ENODEV;
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if (cio_check_config(sch, &schib)) {
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/* commit changes from local schib */
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memcpy(&sch->schib, &schib, sizeof(schib));
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return 0;
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}
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ret = -EAGAIN;
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break;
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case 1: /* status pending */
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ret = -EBUSY;
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if (tsch(sch->schid, &irb))
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return ret;
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break;
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case 2: /* busy */
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udelay(100); /* allow for recovery */
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ret = -EBUSY;
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break;
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case 3: /* not operational */
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return -ENODEV;
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}
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(cio_commit_config);
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/**
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* cio_update_schib - Perform stsch and update schib if subchannel is valid.
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* @sch: subchannel on which to perform stsch
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* Return zero on success, -ENODEV otherwise.
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*/
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int cio_update_schib(struct subchannel *sch)
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{
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struct schib schib;
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if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
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return -ENODEV;
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memcpy(&sch->schib, &schib, sizeof(schib));
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return 0;
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}
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EXPORT_SYMBOL_GPL(cio_update_schib);
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/**
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* cio_enable_subchannel - enable a subchannel.
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* @sch: subchannel to be enabled
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* @intparm: interruption parameter to set
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*/
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int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
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{
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int ret;
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CIO_TRACE_EVENT(2, "ensch");
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CIO_TRACE_EVENT(2, dev_name(&sch->dev));
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if (sch_is_pseudo_sch(sch))
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return -EINVAL;
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if (cio_update_schib(sch))
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return -ENODEV;
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sch->config.ena = 1;
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sch->config.isc = sch->isc;
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sch->config.intparm = intparm;
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ret = cio_commit_config(sch);
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if (ret == -EIO) {
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/*
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* Got a program check in msch. Try without
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* the concurrent sense bit the next time.
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*/
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sch->config.csense = 0;
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ret = cio_commit_config(sch);
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}
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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);
|
|
|
|
/*
|
|
* 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 = &get_irq_regs()->tpi_info;
|
|
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;
|
|
}
|
|
|
|
void __init init_cio_interrupts(void)
|
|
{
|
|
irq_set_chip_and_handler(IO_INTERRUPT,
|
|
&dummy_irq_chip, handle_percpu_irq);
|
|
if (request_irq(IO_INTERRUPT, do_cio_interrupt, 0, "I/O", NULL))
|
|
panic("Failed to register I/O interrupt\n");
|
|
}
|
|
|
|
#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;
|
|
struct schib schib;
|
|
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;
|
|
ret = stsch(schid, &schib);
|
|
if (ret)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
sch = css_alloc_subchannel(schid, &schib);
|
|
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);
|