/* * drivers/s390/cio/cio.c * S/390 common I/O routines -- low level i/o calls * * Copyright (C) IBM Corp. 1999,2006 * Author(s): Ingo Adlung (adlung@de.ibm.com) * Cornelia Huck (cornelia.huck@de.ibm.com) * Arnd Bergmann (arndb@de.ibm.com) * Martin Schwidefsky (schwidefsky@de.ibm.com) */ #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/device.h> #include <linux/kernel_stat.h> #include <linux/interrupt.h> #include <asm/cio.h> #include <asm/delay.h> #include <asm/irq.h> #include <asm/irq_regs.h> #include <asm/setup.h> #include <asm/reset.h> #include <asm/ipl.h> #include <asm/chpid.h> #include <asm/airq.h> #include <asm/cpu.h> #include "cio.h" #include "css.h" #include "chsc.h" #include "ioasm.h" #include "io_sch.h" #include "blacklist.h" #include "cio_debug.h" #include "chp.h" #include "../s390mach.h" debug_info_t *cio_debug_msg_id; debug_info_t *cio_debug_trace_id; debug_info_t *cio_debug_crw_id; int cio_show_msg; static int __init cio_setup (char *parm) { if (!strcmp (parm, "yes")) cio_show_msg = 1; else if (!strcmp (parm, "no")) cio_show_msg = 0; else printk(KERN_ERR "cio: cio_setup: " "invalid cio_msg parameter '%s'", parm); return 1; } __setup ("cio_msg=", cio_setup); /* * Function: cio_debug_init * Initializes three debug logs for common I/O: * - cio_msg logs generic cio messages * - cio_trace logs the calling of different functions * - cio_crw logs machine check related cio messages */ static int __init cio_debug_init(void) { cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long)); if (!cio_debug_msg_id) goto out_unregister; debug_register_view(cio_debug_msg_id, &debug_sprintf_view); debug_set_level(cio_debug_msg_id, 2); cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); if (!cio_debug_trace_id) goto out_unregister; debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); debug_set_level(cio_debug_trace_id, 2); cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long)); if (!cio_debug_crw_id) goto out_unregister; debug_register_view(cio_debug_crw_id, &debug_sprintf_view); debug_set_level(cio_debug_crw_id, 4); return 0; out_unregister: if (cio_debug_msg_id) debug_unregister(cio_debug_msg_id); if (cio_debug_trace_id) debug_unregister(cio_debug_trace_id); if (cio_debug_crw_id) debug_unregister(cio_debug_crw_id); printk(KERN_WARNING"cio: could not initialize debugging\n"); return -1; } arch_initcall (cio_debug_init); int cio_set_options (struct subchannel *sch, int flags) { sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; return 0; } /* FIXME: who wants to use this? */ int cio_get_options (struct subchannel *sch) { int flags; flags = 0; if (sch->options.suspend) flags |= DOIO_ALLOW_SUSPEND; if (sch->options.prefetch) flags |= DOIO_DENY_PREFETCH; if (sch->options.inter) flags |= DOIO_SUPPRESS_INTER; return flags; } /* * Use tpi to get a pending interrupt, call the interrupt handler and * return a pointer to the subchannel structure. */ static int cio_tpi(void) { struct tpi_info *tpi_info; struct subchannel *sch; struct irb *irb; tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; if (tpi (NULL) != 1) return 0; irb = (struct irb *) __LC_IRB; /* Store interrupt response block to lowcore. */ if (tsch (tpi_info->schid, irb) != 0) /* Not status pending or not operational. */ return 1; sch = (struct subchannel *)(unsigned long)tpi_info->intparm; if (!sch) return 1; local_bh_disable(); irq_enter (); spin_lock(sch->lock); memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw)); if (sch->driver && sch->driver->irq) sch->driver->irq(sch); spin_unlock(sch->lock); irq_exit (); _local_bh_enable(); return 1; } static int cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) { char dbf_text[15]; if (lpm != 0) sch->lpm &= ~lpm; else sch->lpm = 0; stsch (sch->schid, &sch->schib); CIO_MSG_EVENT(0, "cio_start: 'not oper' status for " "subchannel 0.%x.%04x!\n", sch->schid.ssid, sch->schid.sch_no); sprintf(dbf_text, "no%s", sch->dev.bus_id); CIO_TRACE_EVENT(0, dbf_text); CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); return (sch->lpm ? -EACCES : -ENODEV); } int cio_start_key (struct subchannel *sch, /* subchannel structure */ struct ccw1 * cpa, /* logical channel prog addr */ __u8 lpm, /* logical path mask */ __u8 key) /* storage key */ { char dbf_txt[15]; int ccode; struct orb *orb; CIO_TRACE_EVENT(4, "stIO"); CIO_TRACE_EVENT(4, sch->dev.bus_id); orb = &to_io_private(sch)->orb; /* sch is always under 2G. */ orb->intparm = (u32)(addr_t)sch; orb->fmt = 1; orb->pfch = sch->options.prefetch == 0; orb->spnd = sch->options.suspend; orb->ssic = sch->options.suspend && sch->options.inter; orb->lpm = (lpm != 0) ? lpm : sch->lpm; #ifdef CONFIG_64BIT /* * for 64 bit we always support 64 bit IDAWs with 4k page size only */ orb->c64 = 1; orb->i2k = 0; #endif orb->key = key >> 4; /* issue "Start Subchannel" */ orb->cpa = (__u32) __pa(cpa); ccode = ssch(sch->schid, orb); /* process condition code */ sprintf(dbf_txt, "ccode:%d", ccode); CIO_TRACE_EVENT(4, dbf_txt); switch (ccode) { case 0: /* * initialize device status information */ sch->schib.scsw.actl |= SCSW_ACTL_START_PEND; return 0; case 1: /* status pending */ case 2: /* busy */ return -EBUSY; default: /* device/path not operational */ return cio_start_handle_notoper(sch, lpm); } } int cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) { return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); } /* * resume suspended I/O operation */ int cio_resume (struct subchannel *sch) { char dbf_txt[15]; int ccode; CIO_TRACE_EVENT (4, "resIO"); CIO_TRACE_EVENT (4, sch->dev.bus_id); ccode = rsch (sch->schid); sprintf (dbf_txt, "ccode:%d", ccode); CIO_TRACE_EVENT (4, dbf_txt); switch (ccode) { case 0: sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND; return 0; case 1: return -EBUSY; case 2: return -EINVAL; default: /* * useless to wait for request completion * as device is no longer operational ! */ return -ENODEV; } } /* * halt I/O operation */ int cio_halt(struct subchannel *sch) { char dbf_txt[15]; int ccode; if (!sch) return -ENODEV; CIO_TRACE_EVENT (2, "haltIO"); CIO_TRACE_EVENT (2, sch->dev.bus_id); /* * Issue "Halt subchannel" and process condition code */ ccode = hsch (sch->schid); sprintf (dbf_txt, "ccode:%d", ccode); CIO_TRACE_EVENT (2, dbf_txt); switch (ccode) { case 0: sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND; return 0; case 1: /* status pending */ case 2: /* busy */ return -EBUSY; default: /* device not operational */ return -ENODEV; } } /* * Clear I/O operation */ int cio_clear(struct subchannel *sch) { char dbf_txt[15]; int ccode; if (!sch) return -ENODEV; CIO_TRACE_EVENT (2, "clearIO"); CIO_TRACE_EVENT (2, sch->dev.bus_id); /* * Issue "Clear subchannel" and process condition code */ ccode = csch (sch->schid); sprintf (dbf_txt, "ccode:%d", ccode); CIO_TRACE_EVENT (2, dbf_txt); switch (ccode) { case 0: sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND; return 0; default: /* device not operational */ return -ENODEV; } } /* * Function: cio_cancel * Issues a "Cancel Subchannel" on the specified subchannel * Note: We don't need any fancy intparms and flags here * since xsch is executed synchronously. * Only for common I/O internal use as for now. */ int cio_cancel (struct subchannel *sch) { char dbf_txt[15]; int ccode; if (!sch) return -ENODEV; CIO_TRACE_EVENT (2, "cancelIO"); CIO_TRACE_EVENT (2, sch->dev.bus_id); ccode = xsch (sch->schid); sprintf (dbf_txt, "ccode:%d", ccode); CIO_TRACE_EVENT (2, dbf_txt); switch (ccode) { case 0: /* success */ /* Update information in scsw. */ stsch (sch->schid, &sch->schib); return 0; case 1: /* status pending */ return -EBUSY; case 2: /* not applicable */ return -EINVAL; default: /* not oper */ return -ENODEV; } } /* * Function: cio_modify * Issues a "Modify Subchannel" on the specified subchannel */ int cio_modify (struct subchannel *sch) { int ccode, retry, ret; ret = 0; for (retry = 0; retry < 5; retry++) { ccode = msch_err (sch->schid, &sch->schib); if (ccode < 0) /* -EIO if msch gets a program check. */ return ccode; switch (ccode) { case 0: /* successfull */ return 0; case 1: /* status pending */ return -EBUSY; case 2: /* busy */ udelay (100); /* allow for recovery */ ret = -EBUSY; break; case 3: /* not operational */ return -ENODEV; } } return ret; } /* * Enable subchannel. */ int cio_enable_subchannel(struct subchannel *sch, unsigned int isc, u32 intparm) { char dbf_txt[15]; int ccode; int retry; int ret; CIO_TRACE_EVENT (2, "ensch"); CIO_TRACE_EVENT (2, sch->dev.bus_id); if (sch_is_pseudo_sch(sch)) return -EINVAL; ccode = stsch (sch->schid, &sch->schib); if (ccode) return -ENODEV; for (retry = 5, ret = 0; retry > 0; retry--) { sch->schib.pmcw.ena = 1; sch->schib.pmcw.isc = isc; sch->schib.pmcw.intparm = intparm; ret = cio_modify(sch); if (ret == -ENODEV) break; if (ret == -EIO) /* * Got a program check in cio_modify. Try without * the concurrent sense bit the next time. */ sch->schib.pmcw.csense = 0; if (ret == 0) { stsch (sch->schid, &sch->schib); if (sch->schib.pmcw.ena) break; } if (ret == -EBUSY) { struct irb irb; if (tsch(sch->schid, &irb) != 0) break; } } sprintf (dbf_txt, "ret:%d", ret); CIO_TRACE_EVENT (2, dbf_txt); return ret; } /* * Disable subchannel. */ int cio_disable_subchannel (struct subchannel *sch) { char dbf_txt[15]; int ccode; int retry; int ret; CIO_TRACE_EVENT (2, "dissch"); CIO_TRACE_EVENT (2, sch->dev.bus_id); if (sch_is_pseudo_sch(sch)) return 0; ccode = stsch (sch->schid, &sch->schib); if (ccode == 3) /* Not operational. */ return -ENODEV; if (sch->schib.scsw.actl != 0) /* * the disable function must not be called while there are * requests pending for completion ! */ return -EBUSY; for (retry = 5, ret = 0; retry > 0; retry--) { sch->schib.pmcw.ena = 0; ret = cio_modify(sch); if (ret == -ENODEV) break; if (ret == -EBUSY) /* * The subchannel is busy or status pending. * We'll disable when the next interrupt was delivered * via the state machine. */ break; if (ret == 0) { stsch (sch->schid, &sch->schib); if (!sch->schib.pmcw.ena) break; } } sprintf (dbf_txt, "ret:%d", ret); CIO_TRACE_EVENT (2, dbf_txt); return ret; } int cio_create_sch_lock(struct subchannel *sch) { sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); if (!sch->lock) return -ENOMEM; spin_lock_init(sch->lock); return 0; } /* * cio_validate_subchannel() * * Find out subchannel type and initialize struct subchannel. * Return codes: * SUBCHANNEL_TYPE_IO for a normal io subchannel * SUBCHANNEL_TYPE_CHSC for a chsc subchannel * SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel * SUBCHANNEL_TYPE_ADM for a adm(?) subchannel * -ENXIO for non-defined subchannels * -ENODEV for subchannels with invalid device number or blacklisted devices */ int cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid) { char dbf_txt[15]; int ccode; int err; sprintf (dbf_txt, "valsch%x", schid.sch_no); CIO_TRACE_EVENT (4, dbf_txt); /* Nuke all fields. */ memset(sch, 0, sizeof(struct subchannel)); sch->schid = schid; if (cio_is_console(schid)) { sch->lock = cio_get_console_lock(); } else { err = cio_create_sch_lock(sch); if (err) goto out; } mutex_init(&sch->reg_mutex); /* Set a name for the subchannel */ snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, schid.sch_no); /* * The first subchannel that is not-operational (ccode==3) * indicates that there aren't any more devices available. * If stsch gets an exception, it means the current subchannel set * is not valid. */ ccode = stsch_err (schid, &sch->schib); if (ccode) { err = (ccode == 3) ? -ENXIO : ccode; goto out; } /* Copy subchannel type from path management control word. */ sch->st = sch->schib.pmcw.st; /* * ... just being curious we check for non I/O subchannels */ if (sch->st != 0) { CIO_DEBUG(KERN_INFO, 0, "Subchannel 0.%x.%04x reports " "non-I/O subchannel type %04X\n", sch->schid.ssid, sch->schid.sch_no, sch->st); /* We stop here for non-io subchannels. */ err = sch->st; goto out; } /* Initialization for io subchannels. */ if (!css_sch_is_valid(&sch->schib)) { err = -ENODEV; goto out; } /* Devno is valid. */ if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) { /* * This device must not be known to Linux. So we simply * say that there is no device and return ENODEV. */ CIO_MSG_EVENT(4, "Blacklisted device detected " "at devno %04X, subchannel set %x\n", sch->schib.pmcw.dev, sch->schid.ssid); err = -ENODEV; goto out; } if (cio_is_console(sch->schid)) sch->opm = 0xff; else sch->opm = chp_get_sch_opm(sch); sch->lpm = sch->schib.pmcw.pam & sch->opm; CIO_DEBUG(KERN_INFO, 0, "Detected device %04x on subchannel 0.%x.%04X" " - PIM = %02X, PAM = %02X, POM = %02X\n", sch->schib.pmcw.dev, sch->schid.ssid, sch->schid.sch_no, sch->schib.pmcw.pim, sch->schib.pmcw.pam, sch->schib.pmcw.pom); /* * We now have to initially ... * ... set "interruption subclass" * ... enable "concurrent sense" * ... enable "multipath mode" if more than one * CHPID is available. This is done regardless * whether multiple paths are available for us. */ sch->schib.pmcw.isc = 3; /* could be smth. else */ sch->schib.pmcw.csense = 1; /* concurrent sense */ sch->schib.pmcw.ena = 0; if ((sch->lpm & (sch->lpm - 1)) != 0) sch->schib.pmcw.mp = 1; /* multipath mode */ /* clean up possible residual cmf stuff */ sch->schib.pmcw.mme = 0; sch->schib.pmcw.mbfc = 0; sch->schib.pmcw.mbi = 0; sch->schib.mba = 0; return 0; out: if (!cio_is_console(schid)) kfree(sch->lock); sch->lock = NULL; return err; } /* * do_IRQ() handles all normal I/O device IRQ's (the special * SMP cross-CPU interrupts have their own specific * handlers). * */ void do_IRQ (struct pt_regs *regs) { struct tpi_info *tpi_info; struct subchannel *sch; struct irb *irb; struct pt_regs *old_regs; old_regs = set_irq_regs(regs); irq_enter(); s390_idle_check(); if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) /* Serve timer interrupts first. */ clock_comparator_work(); /* * Get interrupt information from lowcore */ tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; irb = (struct irb *) __LC_IRB; do { kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; /* * Non I/O-subchannel thin interrupts are processed differently */ if (tpi_info->adapter_IO == 1 && tpi_info->int_type == IO_INTERRUPT_TYPE) { do_adapter_IO(); continue; } sch = (struct subchannel *)(unsigned long)tpi_info->intparm; if (!sch) { /* Clear pending interrupt condition. */ tsch(tpi_info->schid, irb); continue; } spin_lock(sch->lock); /* Store interrupt response block to lowcore. */ if (tsch(tpi_info->schid, irb) == 0) { /* Keep subchannel information word up to date. */ memcpy (&sch->schib.scsw, &irb->scsw, sizeof (irb->scsw)); /* Call interrupt handler if there is one. */ if (sch->driver && sch->driver->irq) sch->driver->irq(sch); } spin_unlock(sch->lock); /* * Are more interrupts pending? * If so, the tpi instruction will update the lowcore * to hold the info for the next interrupt. * We don't do this for VM because a tpi drops the cpu * out of the sie which costs more cycles than it saves. */ } while (!MACHINE_IS_VM && tpi (NULL) != 0); irq_exit(); set_irq_regs(old_regs); } #ifdef CONFIG_CCW_CONSOLE static struct subchannel console_subchannel; static struct io_subchannel_private console_priv; static int console_subchannel_in_use; void *cio_get_console_priv(void) { return &console_priv; } /* * busy wait for the next interrupt on the console */ void wait_cons_dev(void) __releases(console_subchannel.lock) __acquires(console_subchannel.lock) { unsigned long cr6 __attribute__ ((aligned (8))); unsigned long save_cr6 __attribute__ ((aligned (8))); /* * before entering the spinlock we may already have * processed the interrupt on a different CPU... */ if (!console_subchannel_in_use) return; /* disable all but isc 7 (console device) */ __ctl_store (save_cr6, 6, 6); cr6 = 0x01000000; __ctl_load (cr6, 6, 6); do { spin_unlock(console_subchannel.lock); if (!cio_tpi()) cpu_relax(); spin_lock(console_subchannel.lock); } while (console_subchannel.schib.scsw.actl != 0); /* * restore previous isc value */ __ctl_load (save_cr6, 6, 6); } static int cio_test_for_console(struct subchannel_id schid, void *data) { if (stsch_err(schid, &console_subchannel.schib) != 0) return -ENXIO; if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && console_subchannel.schib.pmcw.dnv && (console_subchannel.schib.pmcw.dev == console_devno)) { console_irq = schid.sch_no; return 1; /* found */ } return 0; } static int cio_get_console_sch_no(void) { struct subchannel_id schid; init_subchannel_id(&schid); if (console_irq != -1) { /* VM provided us with the irq number of the console. */ schid.sch_no = console_irq; if (stsch(schid, &console_subchannel.schib) != 0 || (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !console_subchannel.schib.pmcw.dnv) return -1; console_devno = console_subchannel.schib.pmcw.dev; } else if (console_devno != -1) { /* At least the console device number is known. */ for_each_subchannel(cio_test_for_console, NULL); if (console_irq == -1) return -1; } else { /* unlike in 2.4, we cannot autoprobe here, since * the channel subsystem is not fully initialized. * With some luck, the HWC console can take over */ printk(KERN_WARNING "cio: No ccw console found!\n"); return -1; } return console_irq; } struct subchannel * cio_probe_console(void) { int sch_no, ret; struct subchannel_id schid; if (xchg(&console_subchannel_in_use, 1) != 0) return ERR_PTR(-EBUSY); sch_no = cio_get_console_sch_no(); if (sch_no == -1) { console_subchannel_in_use = 0; return ERR_PTR(-ENODEV); } memset(&console_subchannel, 0, sizeof(struct subchannel)); init_subchannel_id(&schid); schid.sch_no = sch_no; ret = cio_validate_subchannel(&console_subchannel, schid); if (ret) { console_subchannel_in_use = 0; return ERR_PTR(-ENODEV); } /* * enable console I/O-interrupt subclass 7 */ ctl_set_bit(6, 24); console_subchannel.schib.pmcw.isc = 7; console_subchannel.schib.pmcw.intparm = (u32)(addr_t)&console_subchannel; ret = cio_modify(&console_subchannel); if (ret) { console_subchannel_in_use = 0; return ERR_PTR(ret); } return &console_subchannel; } void cio_release_console(void) { console_subchannel.schib.pmcw.intparm = 0; cio_modify(&console_subchannel); ctl_clear_bit(6, 24); console_subchannel_in_use = 0; } /* Bah... hack to catch console special sausages. */ int cio_is_console(struct subchannel_id schid) { if (!console_subchannel_in_use) return 0; return schid_equal(&schid, &console_subchannel.schid); } struct subchannel * cio_get_console_subchannel(void) { if (!console_subchannel_in_use) return NULL; return &console_subchannel; } #endif static int __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) { int retry, cc; cc = 0; for (retry=0;retry<3;retry++) { schib->pmcw.ena = 0; cc = msch(schid, schib); if (cc) return (cc==3?-ENODEV:-EBUSY); stsch(schid, schib); if (!schib->pmcw.ena) return 0; } return -EBUSY; /* uhm... */ } /* we can't use the normal udelay here, since it enables external interrupts */ static void udelay_reset(unsigned long usecs) { uint64_t start_cc, end_cc; asm volatile ("STCK %0" : "=m" (start_cc)); do { cpu_relax(); asm volatile ("STCK %0" : "=m" (end_cc)); } while (((end_cc - start_cc)/4096) < usecs); } static int __clear_subchannel_easy(struct subchannel_id schid) { int retry; if (csch(schid)) return -ENODEV; for (retry=0;retry<20;retry++) { struct tpi_info ti; if (tpi(&ti)) { tsch(ti.schid, (struct irb *)__LC_IRB); if (schid_equal(&ti.schid, &schid)) return 0; } udelay_reset(100); } return -EBUSY; } static int pgm_check_occured; static void cio_reset_pgm_check_handler(void) { pgm_check_occured = 1; } static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr) { int rc; pgm_check_occured = 0; s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; rc = stsch(schid, addr); s390_base_pgm_handler_fn = NULL; /* The program check handler could have changed pgm_check_occured. */ barrier(); if (pgm_check_occured) return -EIO; else return rc; } static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) { struct schib schib; if (stsch_reset(schid, &schib)) return -ENXIO; if (!schib.pmcw.ena) return 0; switch(__disable_subchannel_easy(schid, &schib)) { case 0: case -ENODEV: break; default: /* -EBUSY */ if (__clear_subchannel_easy(schid)) break; /* give up... */ stsch(schid, &schib); __disable_subchannel_easy(schid, &schib); } return 0; } static atomic_t chpid_reset_count; static void s390_reset_chpids_mcck_handler(void) { struct crw crw; struct mci *mci; /* Check for pending channel report word. */ mci = (struct mci *)&S390_lowcore.mcck_interruption_code; if (!mci->cp) return; /* Process channel report words. */ while (stcrw(&crw) == 0) { /* Check for responses to RCHP. */ if (crw.slct && crw.rsc == CRW_RSC_CPATH) atomic_dec(&chpid_reset_count); } } #define RCHP_TIMEOUT (30 * USEC_PER_SEC) static void css_reset(void) { int i, ret; unsigned long long timeout; struct chp_id chpid; /* Reset subchannels. */ for_each_subchannel(__shutdown_subchannel_easy, NULL); /* Reset channel paths. */ s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; /* Enable channel report machine checks. */ __ctl_set_bit(14, 28); /* Temporarily reenable machine checks. */ local_mcck_enable(); chp_id_init(&chpid); for (i = 0; i <= __MAX_CHPID; i++) { chpid.id = i; ret = rchp(chpid); if ((ret == 0) || (ret == 2)) /* * rchp either succeeded, or another rchp is already * in progress. In either case, we'll get a crw. */ atomic_inc(&chpid_reset_count); } /* Wait for machine check for all channel paths. */ timeout = get_clock() + (RCHP_TIMEOUT << 12); while (atomic_read(&chpid_reset_count) != 0) { if (get_clock() > timeout) break; cpu_relax(); } /* Disable machine checks again. */ local_mcck_disable(); /* Disable channel report machine checks. */ __ctl_clear_bit(14, 28); s390_base_mcck_handler_fn = NULL; } static struct reset_call css_reset_call = { .fn = css_reset, }; static int __init init_css_reset_call(void) { atomic_set(&chpid_reset_count, 0); register_reset_call(&css_reset_call); return 0; } arch_initcall(init_css_reset_call); struct sch_match_id { struct subchannel_id schid; struct ccw_dev_id devid; int rc; }; static int __reipl_subchannel_match(struct subchannel_id schid, void *data) { struct schib schib; struct sch_match_id *match_id = data; if (stsch_reset(schid, &schib)) return -ENXIO; if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && (schib.pmcw.dev == match_id->devid.devno) && (schid.ssid == match_id->devid.ssid)) { match_id->schid = schid; match_id->rc = 0; return 1; } return 0; } static int reipl_find_schid(struct ccw_dev_id *devid, struct subchannel_id *schid) { struct sch_match_id match_id; match_id.devid = *devid; match_id.rc = -ENODEV; for_each_subchannel(__reipl_subchannel_match, &match_id); if (match_id.rc == 0) *schid = match_id.schid; return match_id.rc; } extern void do_reipl_asm(__u32 schid); /* Make sure all subchannels are quiet before we re-ipl an lpar. */ void reipl_ccw_dev(struct ccw_dev_id *devid) { struct subchannel_id schid; s390_reset_system(); if (reipl_find_schid(devid, &schid) != 0) panic("IPL Device not found\n"); do_reipl_asm(*((__u32*)&schid)); } int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) { struct subchannel_id schid; struct schib schib; schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; if (!schid.one) return -ENODEV; if (stsch(schid, &schib)) return -ENODEV; if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) return -ENODEV; if (!schib.pmcw.dnv) return -ENODEV; iplinfo->devno = schib.pmcw.dev; iplinfo->is_qdio = schib.pmcw.qf; return 0; }