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