![Cornelia Huck](/assets/img/avatar_default.png)
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
882 lines
20 KiB
C
882 lines
20 KiB
C
/*
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* drivers/s390/cio/cio.c
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* S/390 common I/O routines -- low level i/o calls
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* $Revision: 1.140 $
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*
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* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
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* IBM Corporation
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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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#include <linux/module.h>
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#include <linux/config.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 <asm/cio.h>
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#include <asm/delay.h>
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#include <asm/irq.h>
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#include "airq.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 "blacklist.h"
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#include "cio_debug.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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int cio_show_msg;
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static int __init
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cio_setup (char *parm)
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{
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if (!strcmp (parm, "yes"))
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cio_show_msg = 1;
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else if (!strcmp (parm, "no"))
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cio_show_msg = 0;
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else
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printk (KERN_ERR "cio_setup : invalid cio_msg parameter '%s'",
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parm);
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return 1;
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}
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__setup ("cio_msg=", cio_setup);
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/*
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* Function: cio_debug_init
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* Initializes three debug logs (under /proc/s390dbf) for common I/O:
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* - cio_msg logs the messages which are printk'ed when CONFIG_DEBUG_IO is on
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* - cio_trace logs the calling of different functions
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* - cio_crw logs the messages which are printk'ed when CONFIG_DEBUG_CRW is on
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* debug levels depend on CONFIG_DEBUG_IO resp. CONFIG_DEBUG_CRW
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*/
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static int __init
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cio_debug_init (void)
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{
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cio_debug_msg_id = debug_register ("cio_msg", 16, 4, 16*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, 4, 8);
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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", 4, 4, 16*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, 2);
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pr_debug("debugging initialized\n");
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return 0;
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out_unregister:
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if (cio_debug_msg_id)
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debug_unregister (cio_debug_msg_id);
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if (cio_debug_trace_id)
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debug_unregister (cio_debug_trace_id);
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if (cio_debug_crw_id)
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debug_unregister (cio_debug_crw_id);
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pr_debug("could not initialize debugging\n");
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return -1;
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}
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arch_initcall (cio_debug_init);
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int
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cio_set_options (struct subchannel *sch, int flags)
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{
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sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0;
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sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0;
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sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0;
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return 0;
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}
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/* FIXME: who wants to use this? */
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int
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cio_get_options (struct subchannel *sch)
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{
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int flags;
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flags = 0;
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if (sch->options.suspend)
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flags |= DOIO_ALLOW_SUSPEND;
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if (sch->options.prefetch)
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flags |= DOIO_DENY_PREFETCH;
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if (sch->options.inter)
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flags |= DOIO_SUPPRESS_INTER;
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return flags;
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}
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/*
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* Use tpi to get a pending interrupt, call the interrupt handler and
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* return a pointer to the subchannel structure.
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*/
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static inline int
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cio_tpi(void)
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{
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struct tpi_info *tpi_info;
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struct subchannel *sch;
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struct irb *irb;
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tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
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if (tpi (NULL) != 1)
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return 0;
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irb = (struct irb *) __LC_IRB;
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/* Store interrupt response block to lowcore. */
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if (tsch (tpi_info->schid, irb) != 0)
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/* Not status pending or not operational. */
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return 1;
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sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
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if (!sch)
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return 1;
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local_bh_disable();
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irq_enter ();
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spin_lock(&sch->lock);
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memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw));
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if (sch->driver && sch->driver->irq)
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sch->driver->irq(&sch->dev);
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spin_unlock(&sch->lock);
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irq_exit ();
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__local_bh_enable();
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return 1;
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}
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static inline 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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stsch (sch->schid, &sch->schib);
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CIO_MSG_EVENT(0, "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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sprintf(dbf_text, "no%s", sch->dev.bus_id);
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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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char dbf_txt[15];
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int ccode;
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CIO_TRACE_EVENT (4, "stIO");
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CIO_TRACE_EVENT (4, sch->dev.bus_id);
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/* sch is always under 2G. */
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sch->orb.intparm = (__u32)(unsigned long)sch;
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sch->orb.fmt = 1;
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sch->orb.pfch = sch->options.prefetch == 0;
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sch->orb.spnd = sch->options.suspend;
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sch->orb.ssic = sch->options.suspend && sch->options.inter;
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sch->orb.lpm = (lpm != 0) ? (lpm & sch->opm) : sch->lpm;
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#ifdef CONFIG_64BIT
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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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sch->orb.c64 = 1;
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sch->orb.i2k = 0;
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#endif
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sch->orb.key = key >> 4;
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/* issue "Start Subchannel" */
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sch->orb.cpa = (__u32) __pa (cpa);
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ccode = ssch (sch->schid, &sch->orb);
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/* process condition code */
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sprintf (dbf_txt, "ccode:%d", ccode);
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CIO_TRACE_EVENT (4, dbf_txt);
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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.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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default: /* device/path not operational */
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return cio_start_handle_notoper(sch, lpm);
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}
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}
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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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/*
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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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char dbf_txt[15];
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int ccode;
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CIO_TRACE_EVENT (4, "resIO");
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CIO_TRACE_EVENT (4, sch->dev.bus_id);
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ccode = rsch (sch->schid);
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sprintf (dbf_txt, "ccode:%d", ccode);
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CIO_TRACE_EVENT (4, dbf_txt);
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switch (ccode) {
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case 0:
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sch->schib.scsw.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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/*
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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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char dbf_txt[15];
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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, sch->dev.bus_id);
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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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sprintf (dbf_txt, "ccode:%d", ccode);
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CIO_TRACE_EVENT (2, dbf_txt);
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switch (ccode) {
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case 0:
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sch->schib.scsw.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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/*
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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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char dbf_txt[15];
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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, sch->dev.bus_id);
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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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sprintf (dbf_txt, "ccode:%d", ccode);
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CIO_TRACE_EVENT (2, dbf_txt);
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switch (ccode) {
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case 0:
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sch->schib.scsw.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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/*
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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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char dbf_txt[15];
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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, sch->dev.bus_id);
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ccode = xsch (sch->schid);
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sprintf (dbf_txt, "ccode:%d", ccode);
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CIO_TRACE_EVENT (2, dbf_txt);
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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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stsch (sch->schid, &sch->schib);
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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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/*
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* Function: cio_modify
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* Issues a "Modify Subchannel" on the specified subchannel
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*/
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int
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cio_modify (struct subchannel *sch)
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{
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int ccode, retry, ret;
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ret = 0;
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for (retry = 0; retry < 5; retry++) {
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ccode = msch_err (sch->schid, &sch->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: /* successfull */
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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: /* 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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/*
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* Enable subchannel.
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*/
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int
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cio_enable_subchannel (struct subchannel *sch, unsigned int isc)
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{
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char dbf_txt[15];
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int ccode;
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int retry;
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int ret;
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CIO_TRACE_EVENT (2, "ensch");
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CIO_TRACE_EVENT (2, sch->dev.bus_id);
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ccode = stsch (sch->schid, &sch->schib);
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if (ccode)
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return -ENODEV;
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for (retry = 5, ret = 0; retry > 0; retry--) {
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sch->schib.pmcw.ena = 1;
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sch->schib.pmcw.isc = isc;
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sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
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ret = cio_modify(sch);
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if (ret == -ENODEV)
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break;
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if (ret == -EIO)
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/*
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* Got a program check in cio_modify. Try without
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* the concurrent sense bit the next time.
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*/
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sch->schib.pmcw.csense = 0;
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if (ret == 0) {
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stsch (sch->schid, &sch->schib);
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if (sch->schib.pmcw.ena)
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break;
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}
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if (ret == -EBUSY) {
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struct irb irb;
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if (tsch(sch->schid, &irb) != 0)
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break;
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}
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}
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sprintf (dbf_txt, "ret:%d", ret);
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CIO_TRACE_EVENT (2, dbf_txt);
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return ret;
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}
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/*
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* Disable subchannel.
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*/
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int
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cio_disable_subchannel (struct subchannel *sch)
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{
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char dbf_txt[15];
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int ccode;
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int retry;
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int ret;
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CIO_TRACE_EVENT (2, "dissch");
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CIO_TRACE_EVENT (2, sch->dev.bus_id);
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ccode = stsch (sch->schid, &sch->schib);
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if (ccode == 3) /* Not operational. */
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return -ENODEV;
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if (sch->schib.scsw.actl != 0)
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/*
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* the disable function must not be called while there are
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* requests pending for completion !
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*/
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return -EBUSY;
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for (retry = 5, ret = 0; retry > 0; retry--) {
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sch->schib.pmcw.ena = 0;
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ret = cio_modify(sch);
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if (ret == -ENODEV)
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break;
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if (ret == -EBUSY)
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/*
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* The subchannel is busy or status pending.
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* We'll disable when the next interrupt was delivered
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* via the state machine.
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*/
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break;
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if (ret == 0) {
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stsch (sch->schid, &sch->schib);
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if (!sch->schib.pmcw.ena)
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break;
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}
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}
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sprintf (dbf_txt, "ret:%d", ret);
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CIO_TRACE_EVENT (2, dbf_txt);
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return ret;
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}
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/*
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* cio_validate_subchannel()
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*
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* Find out subchannel type and initialize struct subchannel.
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* Return codes:
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* SUBCHANNEL_TYPE_IO for a normal io subchannel
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* SUBCHANNEL_TYPE_CHSC for a chsc subchannel
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* SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel
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* SUBCHANNEL_TYPE_ADM for a adm(?) subchannel
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* -ENXIO for non-defined subchannels
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* -ENODEV for subchannels with invalid device number or blacklisted devices
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*/
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int
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cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
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{
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char dbf_txt[15];
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int ccode;
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sprintf (dbf_txt, "valsch%x", schid.sch_no);
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CIO_TRACE_EVENT (4, dbf_txt);
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/* Nuke all fields. */
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memset(sch, 0, sizeof(struct subchannel));
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spin_lock_init(&sch->lock);
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/* Set a name for the subchannel */
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snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid,
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schid.sch_no);
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/*
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* 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_err (schid, &sch->schib);
|
|
if (ccode)
|
|
return (ccode == 3) ? -ENXIO : ccode;
|
|
|
|
sch->schid = schid;
|
|
/* Copy subchannel type from path management control word. */
|
|
sch->st = sch->schib.pmcw.st;
|
|
|
|
/*
|
|
* ... just being curious we check for non I/O subchannels
|
|
*/
|
|
if (sch->st != 0) {
|
|
CIO_DEBUG(KERN_INFO, 0,
|
|
"Subchannel 0.%x.%04x reports "
|
|
"non-I/O subchannel type %04X\n",
|
|
sch->schid.ssid, sch->schid.sch_no, sch->st);
|
|
/* We stop here for non-io subchannels. */
|
|
return sch->st;
|
|
}
|
|
|
|
/* Initialization for io subchannels. */
|
|
if (!sch->schib.pmcw.dnv)
|
|
/* io subchannel but device number is invalid. */
|
|
return -ENODEV;
|
|
|
|
/* Devno is valid. */
|
|
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(0, "Blacklisted device detected "
|
|
"at devno %04X, subchannel set %x\n",
|
|
sch->schib.pmcw.dev, sch->schid.ssid);
|
|
return -ENODEV;
|
|
}
|
|
sch->opm = 0xff;
|
|
if (!cio_is_console(sch->schid))
|
|
chsc_validate_chpids(sch);
|
|
sch->lpm = sch->schib.pmcw.pim &
|
|
sch->schib.pmcw.pam &
|
|
sch->schib.pmcw.pom &
|
|
sch->opm;
|
|
|
|
CIO_DEBUG(KERN_INFO, 0,
|
|
"Detected device %04x on subchannel 0.%x.%04X"
|
|
" - PIM = %02X, PAM = %02X, POM = %02X\n",
|
|
sch->schib.pmcw.dev, sch->schid.ssid,
|
|
sch->schid.sch_no, sch->schib.pmcw.pim,
|
|
sch->schib.pmcw.pam, sch->schib.pmcw.pom);
|
|
|
|
/*
|
|
* We now have to initially ...
|
|
* ... set "interruption subclass"
|
|
* ... enable "concurrent sense"
|
|
* ... enable "multipath mode" if more than one
|
|
* CHPID is available. This is done regardless
|
|
* whether multiple paths are available for us.
|
|
*/
|
|
sch->schib.pmcw.isc = 3; /* could be smth. else */
|
|
sch->schib.pmcw.csense = 1; /* concurrent sense */
|
|
sch->schib.pmcw.ena = 0;
|
|
if ((sch->lpm & (sch->lpm - 1)) != 0)
|
|
sch->schib.pmcw.mp = 1; /* multipath mode */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* do_IRQ() handles all normal I/O device IRQ's (the special
|
|
* SMP cross-CPU interrupts have their own specific
|
|
* handlers).
|
|
*
|
|
*/
|
|
void
|
|
do_IRQ (struct pt_regs *regs)
|
|
{
|
|
struct tpi_info *tpi_info;
|
|
struct subchannel *sch;
|
|
struct irb *irb;
|
|
|
|
irq_enter ();
|
|
asm volatile ("mc 0,0");
|
|
if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer)
|
|
/**
|
|
* Make sure that the i/o interrupt did not "overtake"
|
|
* the last HZ timer interrupt.
|
|
*/
|
|
account_ticks(regs);
|
|
/*
|
|
* Get interrupt information from lowcore
|
|
*/
|
|
tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
|
|
irb = (struct irb *) __LC_IRB;
|
|
do {
|
|
kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++;
|
|
/*
|
|
* Non I/O-subchannel thin interrupts are processed differently
|
|
*/
|
|
if (tpi_info->adapter_IO == 1 &&
|
|
tpi_info->int_type == IO_INTERRUPT_TYPE) {
|
|
do_adapter_IO();
|
|
continue;
|
|
}
|
|
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
|
|
if (sch)
|
|
spin_lock(&sch->lock);
|
|
/* Store interrupt response block to lowcore. */
|
|
if (tsch (tpi_info->schid, irb) == 0 && sch) {
|
|
/* 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->dev);
|
|
}
|
|
if (sch)
|
|
spin_unlock(&sch->lock);
|
|
/*
|
|
* Are more interrupts pending?
|
|
* If so, the tpi instruction will update the lowcore
|
|
* to hold the info for the next interrupt.
|
|
* We don't do this for VM because a tpi drops the cpu
|
|
* out of the sie which costs more cycles than it saves.
|
|
*/
|
|
} while (!MACHINE_IS_VM && tpi (NULL) != 0);
|
|
irq_exit ();
|
|
}
|
|
|
|
#ifdef CONFIG_CCW_CONSOLE
|
|
static struct subchannel console_subchannel;
|
|
static int console_subchannel_in_use;
|
|
|
|
/*
|
|
* busy wait for the next interrupt on the console
|
|
*/
|
|
void
|
|
wait_cons_dev (void)
|
|
{
|
|
unsigned long cr6 __attribute__ ((aligned (8)));
|
|
unsigned long save_cr6 __attribute__ ((aligned (8)));
|
|
|
|
/*
|
|
* before entering the spinlock we may already have
|
|
* processed the interrupt on a different CPU...
|
|
*/
|
|
if (!console_subchannel_in_use)
|
|
return;
|
|
|
|
/* disable all but isc 7 (console device) */
|
|
__ctl_store (save_cr6, 6, 6);
|
|
cr6 = 0x01000000;
|
|
__ctl_load (cr6, 6, 6);
|
|
|
|
do {
|
|
spin_unlock(&console_subchannel.lock);
|
|
if (!cio_tpi())
|
|
cpu_relax();
|
|
spin_lock(&console_subchannel.lock);
|
|
} while (console_subchannel.schib.scsw.actl != 0);
|
|
/*
|
|
* restore previous isc value
|
|
*/
|
|
__ctl_load (save_cr6, 6, 6);
|
|
}
|
|
|
|
static int
|
|
cio_test_for_console(struct subchannel_id schid, void *data)
|
|
{
|
|
if (stsch_err(schid, &console_subchannel.schib) != 0)
|
|
return -ENXIO;
|
|
if (console_subchannel.schib.pmcw.dnv &&
|
|
console_subchannel.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;
|
|
|
|
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, &console_subchannel.schib) != 0 ||
|
|
!console_subchannel.schib.pmcw.dnv)
|
|
return -1;
|
|
console_devno = console_subchannel.schib.pmcw.dev;
|
|
} else if (console_devno != -1) {
|
|
/* At least the console device number is known. */
|
|
for_each_subchannel(cio_test_for_console, NULL);
|
|
if (console_irq == -1)
|
|
return -1;
|
|
} else {
|
|
/* unlike in 2.4, we cannot autoprobe here, since
|
|
* the channel subsystem is not fully initialized.
|
|
* With some luck, the HWC console can take over */
|
|
printk(KERN_WARNING "No ccw console found!\n");
|
|
return -1;
|
|
}
|
|
return console_irq;
|
|
}
|
|
|
|
struct subchannel *
|
|
cio_probe_console(void)
|
|
{
|
|
int sch_no, ret;
|
|
struct subchannel_id schid;
|
|
|
|
if (xchg(&console_subchannel_in_use, 1) != 0)
|
|
return ERR_PTR(-EBUSY);
|
|
sch_no = cio_get_console_sch_no();
|
|
if (sch_no == -1) {
|
|
console_subchannel_in_use = 0;
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
memset(&console_subchannel, 0, sizeof(struct subchannel));
|
|
init_subchannel_id(&schid);
|
|
schid.sch_no = sch_no;
|
|
ret = cio_validate_subchannel(&console_subchannel, schid);
|
|
if (ret) {
|
|
console_subchannel_in_use = 0;
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
/*
|
|
* enable console I/O-interrupt subclass 7
|
|
*/
|
|
ctl_set_bit(6, 24);
|
|
console_subchannel.schib.pmcw.isc = 7;
|
|
console_subchannel.schib.pmcw.intparm =
|
|
(__u32)(unsigned long)&console_subchannel;
|
|
ret = cio_modify(&console_subchannel);
|
|
if (ret) {
|
|
console_subchannel_in_use = 0;
|
|
return ERR_PTR(ret);
|
|
}
|
|
return &console_subchannel;
|
|
}
|
|
|
|
void
|
|
cio_release_console(void)
|
|
{
|
|
console_subchannel.schib.pmcw.intparm = 0;
|
|
cio_modify(&console_subchannel);
|
|
ctl_clear_bit(6, 24);
|
|
console_subchannel_in_use = 0;
|
|
}
|
|
|
|
/* Bah... hack to catch console special sausages. */
|
|
int
|
|
cio_is_console(struct subchannel_id schid)
|
|
{
|
|
if (!console_subchannel_in_use)
|
|
return 0;
|
|
return schid_equal(&schid, &console_subchannel.schid);
|
|
}
|
|
|
|
struct subchannel *
|
|
cio_get_console_subchannel(void)
|
|
{
|
|
if (!console_subchannel_in_use)
|
|
return 0;
|
|
return &console_subchannel;
|
|
}
|
|
|
|
#endif
|
|
static inline int
|
|
__disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
|
|
{
|
|
int retry, cc;
|
|
|
|
cc = 0;
|
|
for (retry=0;retry<3;retry++) {
|
|
schib->pmcw.ena = 0;
|
|
cc = msch(schid, schib);
|
|
if (cc)
|
|
return (cc==3?-ENODEV:-EBUSY);
|
|
stsch(schid, schib);
|
|
if (!schib->pmcw.ena)
|
|
return 0;
|
|
}
|
|
return -EBUSY; /* uhm... */
|
|
}
|
|
|
|
static inline int
|
|
__clear_subchannel_easy(struct subchannel_id schid)
|
|
{
|
|
int retry;
|
|
|
|
if (csch(schid))
|
|
return -ENODEV;
|
|
for (retry=0;retry<20;retry++) {
|
|
struct tpi_info ti;
|
|
|
|
if (tpi(&ti)) {
|
|
tsch(ti.schid, (struct irb *)__LC_IRB);
|
|
if (schid_equal(&ti.schid, &schid))
|
|
return 0;
|
|
}
|
|
udelay(100);
|
|
}
|
|
return -EBUSY;
|
|
}
|
|
|
|
extern void do_reipl(unsigned long devno);
|
|
static int
|
|
__shutdown_subchannel_easy(struct subchannel_id schid, void *data)
|
|
{
|
|
struct schib schib;
|
|
|
|
if (stsch_err(schid, &schib))
|
|
return -ENXIO;
|
|
if (!schib.pmcw.ena)
|
|
return 0;
|
|
switch(__disable_subchannel_easy(schid, &schib)) {
|
|
case 0:
|
|
case -ENODEV:
|
|
break;
|
|
default: /* -EBUSY */
|
|
if (__clear_subchannel_easy(schid))
|
|
break; /* give up... */
|
|
stsch(schid, &schib);
|
|
__disable_subchannel_easy(schid, &schib);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
clear_all_subchannels(void)
|
|
{
|
|
local_irq_disable();
|
|
for_each_subchannel(__shutdown_subchannel_easy, NULL);
|
|
}
|
|
|
|
/* Make sure all subchannels are quiet before we re-ipl an lpar. */
|
|
void
|
|
reipl(unsigned long devno)
|
|
{
|
|
clear_all_subchannels();
|
|
do_reipl(devno);
|
|
}
|