^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * S/390 common I/O routines -- low level i/o calls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright IBM Corp. 1999, 2008
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author(s): Ingo Adlung (adlung@de.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Cornelia Huck (cornelia.huck@de.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Arnd Bergmann (arndb@de.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Martin Schwidefsky (schwidefsky@de.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #define KMSG_COMPONENT "cio"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/ftrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/kernel_stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/cio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <asm/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <asm/irq_regs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/ipl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/chpid.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <asm/airq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <asm/isc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/sched/cputime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <asm/fcx.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <asm/nmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <asm/crw.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include "cio.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include "css.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include "chsc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include "ioasm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include "io_sch.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include "blacklist.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include "cio_debug.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include "chp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include "trace.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) debug_info_t *cio_debug_msg_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) debug_info_t *cio_debug_trace_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) debug_info_t *cio_debug_crw_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) EXPORT_PER_CPU_SYMBOL(cio_irb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * Function: cio_debug_init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * Initializes three debug logs for common I/O:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * - cio_msg logs generic cio messages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * - cio_trace logs the calling of different functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * - cio_crw logs machine check related cio messages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static int __init cio_debug_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) cio_debug_msg_id = debug_register("cio_msg", 16, 1, 11 * sizeof(long));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) if (!cio_debug_msg_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) goto out_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) debug_set_level(cio_debug_msg_id, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (!cio_debug_trace_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) goto out_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) debug_set_level(cio_debug_trace_id, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) cio_debug_crw_id = debug_register("cio_crw", 8, 1, 8 * sizeof(long));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (!cio_debug_crw_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) goto out_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) debug_set_level(cio_debug_crw_id, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) out_unregister:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) debug_unregister(cio_debug_msg_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) debug_unregister(cio_debug_trace_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) debug_unregister(cio_debug_crw_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) arch_initcall (cio_debug_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) int cio_set_options(struct subchannel *sch, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) struct io_subchannel_private *priv = to_io_private(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) char dbf_text[15];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (lpm != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) sch->lpm &= ~lpm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) sch->lpm = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) "subchannel 0.%x.%04x!\n", sch->schid.ssid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) sch->schid.sch_no);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (cio_update_schib(sch))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) sprintf(dbf_text, "no%s", dev_name(&sch->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) CIO_TRACE_EVENT(0, dbf_text);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return (sch->lpm ? -EACCES : -ENODEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) cio_start_key (struct subchannel *sch, /* subchannel structure */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct ccw1 * cpa, /* logical channel prog addr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) __u8 lpm, /* logical path mask */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) __u8 key) /* storage key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct io_subchannel_private *priv = to_io_private(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) union orb *orb = &priv->orb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) int ccode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) CIO_TRACE_EVENT(5, "stIO");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) CIO_TRACE_EVENT(5, dev_name(&sch->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) memset(orb, 0, sizeof(union orb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /* sch is always under 2G. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) orb->cmd.intparm = (u32)(addr_t)sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) orb->cmd.fmt = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) orb->cmd.pfch = priv->options.prefetch == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) orb->cmd.spnd = priv->options.suspend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) orb->cmd.ssic = priv->options.suspend && priv->options.inter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * for 64 bit we always support 64 bit IDAWs with 4k page size only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) orb->cmd.c64 = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) orb->cmd.i2k = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) orb->cmd.key = key >> 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) /* issue "Start Subchannel" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) orb->cmd.cpa = (__u32) __pa(cpa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) ccode = ssch(sch->schid, orb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /* process condition code */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) CIO_HEX_EVENT(5, &ccode, sizeof(ccode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) switch (ccode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * initialize device status information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) case 1: /* status pending */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) case 2: /* busy */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) case 3: /* device/path not operational */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return cio_start_handle_notoper(sch, lpm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return ccode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) EXPORT_SYMBOL_GPL(cio_start_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) EXPORT_SYMBOL_GPL(cio_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * resume suspended I/O operation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) cio_resume (struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) int ccode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) CIO_TRACE_EVENT(4, "resIO");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) CIO_TRACE_EVENT(4, dev_name(&sch->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) ccode = rsch (sch->schid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) CIO_HEX_EVENT(4, &ccode, sizeof(ccode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) switch (ccode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * useless to wait for request completion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * as device is no longer operational !
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) EXPORT_SYMBOL_GPL(cio_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) * halt I/O operation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) cio_halt(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) int ccode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (!sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) CIO_TRACE_EVENT(2, "haltIO");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) CIO_TRACE_EVENT(2, dev_name(&sch->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * Issue "Halt subchannel" and process condition code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) ccode = hsch (sch->schid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) switch (ccode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) case 1: /* status pending */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) case 2: /* busy */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) default: /* device not operational */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) EXPORT_SYMBOL_GPL(cio_halt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * Clear I/O operation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) cio_clear(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) int ccode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) if (!sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) CIO_TRACE_EVENT(2, "clearIO");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) CIO_TRACE_EVENT(2, dev_name(&sch->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * Issue "Clear subchannel" and process condition code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) ccode = csch (sch->schid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) switch (ccode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) default: /* device not operational */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) EXPORT_SYMBOL_GPL(cio_clear);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) * Function: cio_cancel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) * Issues a "Cancel Subchannel" on the specified subchannel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) * Note: We don't need any fancy intparms and flags here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * since xsch is executed synchronously.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * Only for common I/O internal use as for now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) cio_cancel (struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) int ccode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if (!sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) CIO_TRACE_EVENT(2, "cancelIO");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) CIO_TRACE_EVENT(2, dev_name(&sch->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) ccode = xsch (sch->schid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) switch (ccode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) case 0: /* success */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) /* Update information in scsw. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (cio_update_schib(sch))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) case 1: /* status pending */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) case 2: /* not applicable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) default: /* not oper */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) EXPORT_SYMBOL_GPL(cio_cancel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) * cio_cancel_halt_clear - Cancel running I/O by performing cancel, halt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) * and clear ordinally if subchannel is valid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) * @sch: subchannel on which to perform the cancel_halt_clear operation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) * @iretry: the number of the times remained to retry the next operation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) * This should be called repeatedly since halt/clear are asynchronous
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) * operations. We do one try with cio_cancel, three tries with cio_halt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * 255 tries with cio_clear. The caller should initialize @iretry with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * the value 255 for its first call to this, and keep using the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) * @iretry in the subsequent calls until it gets a non -EBUSY return.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) * Returns 0 if device now idle, -ENODEV for device not operational,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * -EBUSY if an interrupt is expected (either from halt/clear or from a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * status pending), and -EIO if out of retries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) int cio_cancel_halt_clear(struct subchannel *sch, int *iretry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) if (cio_update_schib(sch))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (!sch->schib.pmcw.ena)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /* Not operational -> done. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) /* Stage 1: cancel io. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (!scsw_is_tm(&sch->schib.scsw)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) ret = cio_cancel(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) if (ret != -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * Cancel io unsuccessful or not applicable (transport mode).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * Continue with asynchronous instructions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) *iretry = 3; /* 3 halt retries. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) /* Stage 2: halt io. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (*iretry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) *iretry -= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) ret = cio_halt(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) if (ret != -EBUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) return (ret == 0) ? -EBUSY : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) /* Halt io unsuccessful. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) *iretry = 255; /* 255 clear retries. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) /* Stage 3: clear io. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) if (*iretry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) *iretry -= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) ret = cio_clear(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) return (ret == 0) ? -EBUSY : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) /* Function was unsuccessful */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) EXPORT_SYMBOL_GPL(cio_cancel_halt_clear);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) static void cio_apply_config(struct subchannel *sch, struct schib *schib)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) schib->pmcw.intparm = sch->config.intparm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) schib->pmcw.mbi = sch->config.mbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) schib->pmcw.isc = sch->config.isc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) schib->pmcw.ena = sch->config.ena;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) schib->pmcw.mme = sch->config.mme;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) schib->pmcw.mp = sch->config.mp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) schib->pmcw.csense = sch->config.csense;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) schib->pmcw.mbfc = sch->config.mbfc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (sch->config.mbfc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) schib->mba = sch->config.mba;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) static int cio_check_config(struct subchannel *sch, struct schib *schib)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return (schib->pmcw.intparm == sch->config.intparm) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) (schib->pmcw.mbi == sch->config.mbi) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) (schib->pmcw.isc == sch->config.isc) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) (schib->pmcw.ena == sch->config.ena) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) (schib->pmcw.mme == sch->config.mme) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) (schib->pmcw.mp == sch->config.mp) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) (schib->pmcw.csense == sch->config.csense) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) (schib->pmcw.mbfc == sch->config.mbfc) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) (!sch->config.mbfc || (schib->mba == sch->config.mba));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) * cio_commit_config - apply configuration to the subchannel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) int cio_commit_config(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) int ccode, retry, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) struct schib schib;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) struct irb irb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) for (retry = 0; retry < 5; retry++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) /* copy desired changes to local schib */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) cio_apply_config(sch, &schib);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) ccode = msch(sch->schid, &schib);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) if (ccode < 0) /* -EIO if msch gets a program check. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) return ccode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) switch (ccode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) case 0: /* successful */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (stsch(sch->schid, &schib) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) !css_sch_is_valid(&schib))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) if (cio_check_config(sch, &schib)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) /* commit changes from local schib */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) memcpy(&sch->schib, &schib, sizeof(schib));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) case 1: /* status pending */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) if (tsch(sch->schid, &irb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) case 2: /* busy */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) udelay(100); /* allow for recovery */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) case 3: /* not operational */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) EXPORT_SYMBOL_GPL(cio_commit_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * cio_update_schib - Perform stsch and update schib if subchannel is valid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * @sch: subchannel on which to perform stsch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) * Return zero on success, -ENODEV otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) int cio_update_schib(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) struct schib schib;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) memcpy(&sch->schib, &schib, sizeof(schib));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) EXPORT_SYMBOL_GPL(cio_update_schib);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) * cio_enable_subchannel - enable a subchannel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) * @sch: subchannel to be enabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) * @intparm: interruption parameter to set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) CIO_TRACE_EVENT(2, "ensch");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) CIO_TRACE_EVENT(2, dev_name(&sch->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) if (sch_is_pseudo_sch(sch))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) if (cio_update_schib(sch))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) sch->config.ena = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) sch->config.isc = sch->isc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) sch->config.intparm = intparm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) ret = cio_commit_config(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) if (ret == -EIO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) * Got a program check in msch. Try without
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) * the concurrent sense bit the next time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) sch->config.csense = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) ret = cio_commit_config(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) CIO_HEX_EVENT(2, &ret, sizeof(ret));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) EXPORT_SYMBOL_GPL(cio_enable_subchannel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) * cio_disable_subchannel - disable a subchannel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) * @sch: subchannel to disable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) int cio_disable_subchannel(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) CIO_TRACE_EVENT(2, "dissch");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) CIO_TRACE_EVENT(2, dev_name(&sch->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) if (sch_is_pseudo_sch(sch))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) if (cio_update_schib(sch))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) sch->config.ena = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) ret = cio_commit_config(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) CIO_HEX_EVENT(2, &ret, sizeof(ret));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) EXPORT_SYMBOL_GPL(cio_disable_subchannel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) * do_cio_interrupt() handles all normal I/O device IRQ's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) static irqreturn_t do_cio_interrupt(int irq, void *dummy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) struct tpi_info *tpi_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) struct subchannel *sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) struct irb *irb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) set_cpu_flag(CIF_NOHZ_DELAY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) tpi_info = (struct tpi_info *) &get_irq_regs()->int_code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) trace_s390_cio_interrupt(tpi_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) irb = this_cpu_ptr(&cio_irb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) sch = (struct subchannel *)(unsigned long) tpi_info->intparm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) if (!sch) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) /* Clear pending interrupt condition. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) inc_irq_stat(IRQIO_CIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) tsch(tpi_info->schid, irb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) spin_lock(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) /* Store interrupt response block to lowcore. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) if (tsch(tpi_info->schid, irb) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) /* Keep subchannel information word up to date. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) memcpy (&sch->schib.scsw, &irb->scsw, sizeof (irb->scsw));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) /* Call interrupt handler if there is one. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) if (sch->driver && sch->driver->irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) sch->driver->irq(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) inc_irq_stat(IRQIO_CIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) inc_irq_stat(IRQIO_CIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) spin_unlock(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) void __init init_cio_interrupts(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) irq_set_chip_and_handler(IO_INTERRUPT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) &dummy_irq_chip, handle_percpu_irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) if (request_irq(IO_INTERRUPT, do_cio_interrupt, 0, "I/O", NULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) panic("Failed to register I/O interrupt\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) #ifdef CONFIG_CCW_CONSOLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) static struct subchannel *console_sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) static struct lock_class_key console_sch_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) * Use cio_tsch to update the subchannel status and call the interrupt handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) * if status had been pending. Called with the subchannel's lock held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) void cio_tsch(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) struct irb *irb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) int irq_context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) irb = this_cpu_ptr(&cio_irb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) /* Store interrupt response block to lowcore. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) if (tsch(sch->schid, irb) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) /* Not status pending or not operational. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) /* Call interrupt handler with updated status. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) irq_context = in_interrupt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (!irq_context) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) local_bh_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) irq_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) kstat_incr_irq_this_cpu(IO_INTERRUPT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) if (sch->driver && sch->driver->irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) sch->driver->irq(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) inc_irq_stat(IRQIO_CIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) if (!irq_context) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) irq_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) _local_bh_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) static int cio_test_for_console(struct subchannel_id schid, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) struct schib schib;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (stsch(schid, &schib) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) (schib.pmcw.dev == console_devno)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) console_irq = schid.sch_no;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) return 1; /* found */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) static int cio_get_console_sch_no(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) struct subchannel_id schid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) struct schib schib;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) init_subchannel_id(&schid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) if (console_irq != -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) /* VM provided us with the irq number of the console. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) schid.sch_no = console_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) if (stsch(schid, &schib) != 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) (schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) console_devno = schib.pmcw.dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) } else if (console_devno != -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) /* At least the console device number is known. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) for_each_subchannel(cio_test_for_console, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) return console_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) struct subchannel *cio_probe_console(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) struct subchannel_id schid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) struct subchannel *sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) struct schib schib;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) int sch_no, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) sch_no = cio_get_console_sch_no();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) if (sch_no == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) pr_warn("No CCW console was found\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) return ERR_PTR(-ENODEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) init_subchannel_id(&schid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) schid.sch_no = sch_no;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) ret = stsch(schid, &schib);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) return ERR_PTR(-ENODEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) sch = css_alloc_subchannel(schid, &schib);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) if (IS_ERR(sch))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) return sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) lockdep_set_class(sch->lock, &console_sch_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) isc_register(CONSOLE_ISC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) sch->config.isc = CONSOLE_ISC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) sch->config.intparm = (u32)(addr_t)sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) ret = cio_commit_config(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) isc_unregister(CONSOLE_ISC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) put_device(&sch->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) console_sch = sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) return sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) int cio_is_console(struct subchannel_id schid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) if (!console_sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) return schid_equal(&schid, &console_sch->schid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) void cio_register_early_subchannels(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) if (!console_sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) ret = css_register_subchannel(console_sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) put_device(&console_sch->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) #endif /* CONFIG_CCW_CONSOLE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) * cio_tm_start_key - perform start function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) * @sch: subchannel on which to perform the start function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) * @tcw: transport-command word to be started
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) * @lpm: mask of paths to use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) * @key: storage key to use for storage access
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) * Start the tcw on the given subchannel. Return zero on success, non-zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) * otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) int cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) union orb *orb = &to_io_private(sch)->orb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) memset(orb, 0, sizeof(union orb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) orb->tm.intparm = (u32) (addr_t) sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) orb->tm.key = key >> 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) orb->tm.b = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) orb->tm.lpm = lpm ? lpm : sch->lpm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) orb->tm.tcw = (u32) (addr_t) tcw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) cc = ssch(sch->schid, orb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) switch (cc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) return cio_start_handle_notoper(sch, lpm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) EXPORT_SYMBOL_GPL(cio_tm_start_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) * cio_tm_intrg - perform interrogate function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) * @sch: subchannel on which to perform the interrogate function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) * If the specified subchannel is running in transport-mode, perform the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) * interrogate function. Return zero on success, non-zero otherwie.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) int cio_tm_intrg(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) int cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) if (!to_io_private(sch)->orb.tm.b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) cc = xsch(sch->schid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) switch (cc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) EXPORT_SYMBOL_GPL(cio_tm_intrg);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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