mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-11 05:26:40 +07:00
c513d07a2d
Move the options member from struct subchannel to io_subchannel_private since it's I/O subchannel specific. Also remove the unused cio_get_options function. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1139 lines
26 KiB
C
1139 lines
26 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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*
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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 <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/reset.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 <asm/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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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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/*
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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, 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, 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", 16, 1, 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, 4);
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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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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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#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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orb->cmd.c64 = 1;
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orb->cmd.i2k = 0;
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#endif
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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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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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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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/*
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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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/*
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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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/*
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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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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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struct schib schib;
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int ccode, retry, ret = 0;
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if (stsch_err(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_err(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_err(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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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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* 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_err(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 retry;
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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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for (retry = 0; retry < 3; retry++) {
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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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} else 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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} else
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break;
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}
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CIO_HEX_EVENT(2, &ret, sizeof(ret));
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return ret;
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}
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EXPORT_SYMBOL_GPL(cio_enable_subchannel);
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/**
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* cio_disable_subchannel - disable a subchannel.
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* @sch: subchannel to disable
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*/
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int cio_disable_subchannel(struct subchannel *sch)
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{
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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, dev_name(&sch->dev));
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if (sch_is_pseudo_sch(sch))
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return 0;
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if (cio_update_schib(sch))
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return -ENODEV;
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sch->config.ena = 0;
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for (retry = 0; retry < 3; retry++) {
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ret = cio_commit_config(sch);
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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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} else
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break;
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}
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CIO_HEX_EVENT(2, &ret, sizeof(ret));
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return ret;
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}
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EXPORT_SYMBOL_GPL(cio_disable_subchannel);
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int cio_create_sch_lock(struct subchannel *sch)
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{
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sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
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if (!sch->lock)
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return -ENOMEM;
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spin_lock_init(sch->lock);
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return 0;
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}
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|
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static int cio_check_devno_blacklisted(struct subchannel *sch)
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{
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if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) {
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/*
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* This device must not be known to Linux. So we simply
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* say that there is no device and return ENODEV.
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*/
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CIO_MSG_EVENT(6, "Blacklisted device detected "
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"at devno %04X, subchannel set %x\n",
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sch->schib.pmcw.dev, sch->schid.ssid);
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return -ENODEV;
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}
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return 0;
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}
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|
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static int cio_validate_io_subchannel(struct subchannel *sch)
|
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{
|
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/* Initialization for io subchannels. */
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if (!css_sch_is_valid(&sch->schib))
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return -ENODEV;
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|
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/* Devno is valid. */
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return cio_check_devno_blacklisted(sch);
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}
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|
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static int cio_validate_msg_subchannel(struct subchannel *sch)
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{
|
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/* Initialization for message subchannels. */
|
|
if (!css_sch_is_valid(&sch->schib))
|
|
return -ENODEV;
|
|
|
|
/* Devno is valid. */
|
|
return cio_check_devno_blacklisted(sch);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/* Nuke all fields. */
|
|
memset(sch, 0, sizeof(struct subchannel));
|
|
|
|
sch->schid = schid;
|
|
if (cio_is_console(schid)) {
|
|
sch->lock = cio_get_console_lock();
|
|
} else {
|
|
err = cio_create_sch_lock(sch);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
mutex_init(&sch->reg_mutex);
|
|
|
|
/*
|
|
* 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) {
|
|
err = (ccode == 3) ? -ENXIO : ccode;
|
|
goto out;
|
|
}
|
|
/* Copy subchannel type from path management control word. */
|
|
sch->st = sch->schib.pmcw.st;
|
|
|
|
switch (sch->st) {
|
|
case SUBCHANNEL_TYPE_IO:
|
|
err = cio_validate_io_subchannel(sch);
|
|
break;
|
|
case SUBCHANNEL_TYPE_MSG:
|
|
err = cio_validate_msg_subchannel(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);
|
|
return 0;
|
|
out:
|
|
if (!cio_is_console(schid))
|
|
kfree(sch->lock);
|
|
sch->lock = NULL;
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* do_IRQ() handles all normal I/O device IRQ's (the special
|
|
* SMP cross-CPU interrupts have their own specific
|
|
* handlers).
|
|
*
|
|
*/
|
|
void __irq_entry do_IRQ(struct pt_regs *regs)
|
|
{
|
|
struct tpi_info *tpi_info;
|
|
struct subchannel *sch;
|
|
struct irb *irb;
|
|
struct pt_regs *old_regs;
|
|
|
|
old_regs = set_irq_regs(regs);
|
|
s390_idle_check(regs, S390_lowcore.int_clock,
|
|
S390_lowcore.async_enter_timer);
|
|
irq_enter();
|
|
__this_cpu_write(s390_idle.nohz_delay, 1);
|
|
if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
|
|
/* Serve timer interrupts first. */
|
|
clock_comparator_work();
|
|
/*
|
|
* Get interrupt information from lowcore
|
|
*/
|
|
tpi_info = (struct tpi_info *)&S390_lowcore.subchannel_id;
|
|
irb = (struct irb *)&S390_lowcore.irb;
|
|
do {
|
|
kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++;
|
|
if (tpi_info->adapter_IO) {
|
|
do_adapter_IO(tpi_info->isc);
|
|
continue;
|
|
}
|
|
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
|
|
if (!sch) {
|
|
/* Clear pending interrupt condition. */
|
|
tsch(tpi_info->schid, irb);
|
|
continue;
|
|
}
|
|
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);
|
|
}
|
|
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_LPAR && tpi(NULL) != 0);
|
|
irq_exit();
|
|
set_irq_regs(old_regs);
|
|
}
|
|
|
|
#ifdef CONFIG_CCW_CONSOLE
|
|
static struct subchannel console_subchannel;
|
|
static struct io_subchannel_private console_priv;
|
|
static int console_subchannel_in_use;
|
|
|
|
/*
|
|
* Use tpi to get a pending interrupt, call the interrupt handler and
|
|
* return a pointer to the subchannel structure.
|
|
*/
|
|
static int cio_tpi(void)
|
|
{
|
|
struct tpi_info *tpi_info;
|
|
struct subchannel *sch;
|
|
struct irb *irb;
|
|
int irq_context;
|
|
|
|
tpi_info = (struct tpi_info *)&S390_lowcore.subchannel_id;
|
|
if (tpi(NULL) != 1)
|
|
return 0;
|
|
irb = (struct irb *)&S390_lowcore.irb;
|
|
/* Store interrupt response block to lowcore. */
|
|
if (tsch(tpi_info->schid, irb) != 0)
|
|
/* Not status pending or not operational. */
|
|
return 1;
|
|
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
|
|
if (!sch)
|
|
return 1;
|
|
irq_context = in_interrupt();
|
|
if (!irq_context)
|
|
local_bh_disable();
|
|
irq_enter();
|
|
spin_lock(sch->lock);
|
|
memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw));
|
|
if (sch->driver && sch->driver->irq)
|
|
sch->driver->irq(sch);
|
|
spin_unlock(sch->lock);
|
|
irq_exit();
|
|
if (!irq_context)
|
|
_local_bh_enable();
|
|
return 1;
|
|
}
|
|
|
|
void *cio_get_console_priv(void)
|
|
{
|
|
return &console_priv;
|
|
}
|
|
|
|
/*
|
|
* busy wait for the next interrupt on the console
|
|
*/
|
|
void wait_cons_dev(void)
|
|
__releases(console_subchannel.lock)
|
|
__acquires(console_subchannel.lock)
|
|
{
|
|
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 the console isc */
|
|
__ctl_store (save_cr6, 6, 6);
|
|
cr6 = 1UL << (31 - CONSOLE_ISC);
|
|
__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.cmd.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.st == SUBCHANNEL_TYPE_IO) &&
|
|
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_err(schid, &console_subchannel.schib) != 0 ||
|
|
(console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) ||
|
|
!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 */
|
|
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;
|
|
pr_warning("No CCW console was found\n");
|
|
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
|
|
*/
|
|
isc_register(CONSOLE_ISC);
|
|
console_subchannel.config.isc = CONSOLE_ISC;
|
|
console_subchannel.config.intparm = (u32)(addr_t)&console_subchannel;
|
|
ret = cio_commit_config(&console_subchannel);
|
|
if (ret) {
|
|
isc_unregister(CONSOLE_ISC);
|
|
console_subchannel_in_use = 0;
|
|
return ERR_PTR(ret);
|
|
}
|
|
return &console_subchannel;
|
|
}
|
|
|
|
void
|
|
cio_release_console(void)
|
|
{
|
|
console_subchannel.config.intparm = 0;
|
|
cio_commit_config(&console_subchannel);
|
|
isc_unregister(CONSOLE_ISC);
|
|
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 NULL;
|
|
return &console_subchannel;
|
|
}
|
|
|
|
#endif
|
|
static 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_err(schid, schib);
|
|
if (cc)
|
|
return (cc==3?-ENODEV:-EBUSY);
|
|
if (stsch_err(schid, schib) || !css_sch_is_valid(schib))
|
|
return -ENODEV;
|
|
if (!schib->pmcw.ena)
|
|
return 0;
|
|
}
|
|
return -EBUSY; /* uhm... */
|
|
}
|
|
|
|
static int
|
|
__clear_io_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 *)&S390_lowcore.irb);
|
|
if (schid_equal(&ti.schid, &schid))
|
|
return 0;
|
|
}
|
|
udelay_simple(100);
|
|
}
|
|
return -EBUSY;
|
|
}
|
|
|
|
static void __clear_chsc_subchannel_easy(void)
|
|
{
|
|
/* It seems we can only wait for a bit here :/ */
|
|
udelay_simple(100);
|
|
}
|
|
|
|
static int pgm_check_occured;
|
|
|
|
static void cio_reset_pgm_check_handler(void)
|
|
{
|
|
pgm_check_occured = 1;
|
|
}
|
|
|
|
static int stsch_reset(struct subchannel_id schid, struct schib *addr)
|
|
{
|
|
int rc;
|
|
|
|
pgm_check_occured = 0;
|
|
s390_base_pgm_handler_fn = cio_reset_pgm_check_handler;
|
|
rc = stsch_err(schid, addr);
|
|
s390_base_pgm_handler_fn = NULL;
|
|
|
|
/* The program check handler could have changed pgm_check_occured. */
|
|
barrier();
|
|
|
|
if (pgm_check_occured)
|
|
return -EIO;
|
|
else
|
|
return rc;
|
|
}
|
|
|
|
static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
|
|
{
|
|
struct schib schib;
|
|
|
|
if (stsch_reset(schid, &schib))
|
|
return -ENXIO;
|
|
if (!schib.pmcw.ena)
|
|
return 0;
|
|
switch(__disable_subchannel_easy(schid, &schib)) {
|
|
case 0:
|
|
case -ENODEV:
|
|
break;
|
|
default: /* -EBUSY */
|
|
switch (schib.pmcw.st) {
|
|
case SUBCHANNEL_TYPE_IO:
|
|
if (__clear_io_subchannel_easy(schid))
|
|
goto out; /* give up... */
|
|
break;
|
|
case SUBCHANNEL_TYPE_CHSC:
|
|
__clear_chsc_subchannel_easy();
|
|
break;
|
|
default:
|
|
/* No default clear strategy */
|
|
break;
|
|
}
|
|
stsch_err(schid, &schib);
|
|
__disable_subchannel_easy(schid, &schib);
|
|
}
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
static atomic_t chpid_reset_count;
|
|
|
|
static void s390_reset_chpids_mcck_handler(void)
|
|
{
|
|
struct crw crw;
|
|
struct mci *mci;
|
|
|
|
/* Check for pending channel report word. */
|
|
mci = (struct mci *)&S390_lowcore.mcck_interruption_code;
|
|
if (!mci->cp)
|
|
return;
|
|
/* Process channel report words. */
|
|
while (stcrw(&crw) == 0) {
|
|
/* Check for responses to RCHP. */
|
|
if (crw.slct && crw.rsc == CRW_RSC_CPATH)
|
|
atomic_dec(&chpid_reset_count);
|
|
}
|
|
}
|
|
|
|
#define RCHP_TIMEOUT (30 * USEC_PER_SEC)
|
|
static void css_reset(void)
|
|
{
|
|
int i, ret;
|
|
unsigned long long timeout;
|
|
struct chp_id chpid;
|
|
|
|
/* Reset subchannels. */
|
|
for_each_subchannel(__shutdown_subchannel_easy, NULL);
|
|
/* Reset channel paths. */
|
|
s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler;
|
|
/* Enable channel report machine checks. */
|
|
__ctl_set_bit(14, 28);
|
|
/* Temporarily reenable machine checks. */
|
|
local_mcck_enable();
|
|
chp_id_init(&chpid);
|
|
for (i = 0; i <= __MAX_CHPID; i++) {
|
|
chpid.id = i;
|
|
ret = rchp(chpid);
|
|
if ((ret == 0) || (ret == 2))
|
|
/*
|
|
* rchp either succeeded, or another rchp is already
|
|
* in progress. In either case, we'll get a crw.
|
|
*/
|
|
atomic_inc(&chpid_reset_count);
|
|
}
|
|
/* Wait for machine check for all channel paths. */
|
|
timeout = get_clock() + (RCHP_TIMEOUT << 12);
|
|
while (atomic_read(&chpid_reset_count) != 0) {
|
|
if (get_clock() > timeout)
|
|
break;
|
|
cpu_relax();
|
|
}
|
|
/* Disable machine checks again. */
|
|
local_mcck_disable();
|
|
/* Disable channel report machine checks. */
|
|
__ctl_clear_bit(14, 28);
|
|
s390_base_mcck_handler_fn = NULL;
|
|
}
|
|
|
|
static struct reset_call css_reset_call = {
|
|
.fn = css_reset,
|
|
};
|
|
|
|
static int __init init_css_reset_call(void)
|
|
{
|
|
atomic_set(&chpid_reset_count, 0);
|
|
register_reset_call(&css_reset_call);
|
|
return 0;
|
|
}
|
|
|
|
arch_initcall(init_css_reset_call);
|
|
|
|
struct sch_match_id {
|
|
struct subchannel_id schid;
|
|
struct ccw_dev_id devid;
|
|
int rc;
|
|
};
|
|
|
|
static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
|
|
{
|
|
struct schib schib;
|
|
struct sch_match_id *match_id = data;
|
|
|
|
if (stsch_reset(schid, &schib))
|
|
return -ENXIO;
|
|
if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
|
|
(schib.pmcw.dev == match_id->devid.devno) &&
|
|
(schid.ssid == match_id->devid.ssid)) {
|
|
match_id->schid = schid;
|
|
match_id->rc = 0;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int reipl_find_schid(struct ccw_dev_id *devid,
|
|
struct subchannel_id *schid)
|
|
{
|
|
struct sch_match_id match_id;
|
|
|
|
match_id.devid = *devid;
|
|
match_id.rc = -ENODEV;
|
|
for_each_subchannel(__reipl_subchannel_match, &match_id);
|
|
if (match_id.rc == 0)
|
|
*schid = match_id.schid;
|
|
return match_id.rc;
|
|
}
|
|
|
|
extern void do_reipl_asm(__u32 schid);
|
|
|
|
/* Make sure all subchannels are quiet before we re-ipl an lpar. */
|
|
void reipl_ccw_dev(struct ccw_dev_id *devid)
|
|
{
|
|
struct subchannel_id schid;
|
|
|
|
s390_reset_system();
|
|
if (reipl_find_schid(devid, &schid) != 0)
|
|
panic("IPL Device not found\n");
|
|
do_reipl_asm(*((__u32*)&schid));
|
|
}
|
|
|
|
int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
|
|
{
|
|
struct subchannel_id schid;
|
|
struct schib schib;
|
|
|
|
schid = *(struct subchannel_id *)&S390_lowcore.subchannel_id;
|
|
if (!schid.one)
|
|
return -ENODEV;
|
|
if (stsch_err(schid, &schib))
|
|
return -ENODEV;
|
|
if (schib.pmcw.st != SUBCHANNEL_TYPE_IO)
|
|
return -ENODEV;
|
|
if (!schib.pmcw.dnv)
|
|
return -ENODEV;
|
|
iplinfo->devno = schib.pmcw.dev;
|
|
iplinfo->is_qdio = schib.pmcw.qf;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
}
|