diff options
Diffstat (limited to 'drivers/s390/cio/cio.c')
-rw-r--r-- | drivers/s390/cio/cio.c | 280 |
1 files changed, 175 insertions, 105 deletions
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index 82c6a2d..33bff8f 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -2,7 +2,7 @@ * drivers/s390/cio/cio.c * S/390 common I/O routines -- low level i/o calls * - * Copyright (C) IBM Corp. 1999,2006 + * Copyright IBM Corp. 1999,2008 * Author(s): Ingo Adlung (adlung@de.ibm.com) * Cornelia Huck (cornelia.huck@de.ibm.com) * Arnd Bergmann (arndb@de.ibm.com) @@ -24,7 +24,9 @@ #include <asm/ipl.h> #include <asm/chpid.h> #include <asm/airq.h> +#include <asm/isc.h> #include <asm/cpu.h> +#include <asm/fcx.h> #include "cio.h" #include "css.h" #include "chsc.h" @@ -72,7 +74,6 @@ out_unregister: 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; } @@ -128,7 +129,7 @@ cio_tpi(void) local_bh_disable(); irq_enter (); spin_lock(sch->lock); - memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw)); + memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); if (sch->driver && sch->driver->irq) sch->driver->irq(sch); spin_unlock(sch->lock); @@ -167,30 +168,30 @@ cio_start_key (struct subchannel *sch, /* subchannel structure */ { char dbf_txt[15]; int ccode; - struct orb *orb; + union 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->cmd.intparm = (u32)(addr_t)sch; + orb->cmd.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; + orb->cmd.pfch = sch->options.prefetch == 0; + orb->cmd.spnd = sch->options.suspend; + orb->cmd.ssic = sch->options.suspend && sch->options.inter; + orb->cmd.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; + orb->cmd.c64 = 1; + orb->cmd.i2k = 0; #endif - orb->key = key >> 4; + orb->cmd.key = key >> 4; /* issue "Start Subchannel" */ - orb->cpa = (__u32) __pa(cpa); + orb->cmd.cpa = (__u32) __pa(cpa); ccode = ssch(sch->schid, orb); /* process condition code */ @@ -202,7 +203,7 @@ cio_start_key (struct subchannel *sch, /* subchannel structure */ /* * initialize device status information */ - sch->schib.scsw.actl |= SCSW_ACTL_START_PEND; + sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; return 0; case 1: /* status pending */ case 2: /* busy */ @@ -237,7 +238,7 @@ cio_resume (struct subchannel *sch) switch (ccode) { case 0: - sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND; + sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; return 0; case 1: return -EBUSY; @@ -277,7 +278,7 @@ cio_halt(struct subchannel *sch) switch (ccode) { case 0: - sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND; + sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; return 0; case 1: /* status pending */ case 2: /* busy */ @@ -312,7 +313,7 @@ cio_clear(struct subchannel *sch) switch (ccode) { case 0: - sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND; + sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; return 0; default: /* device not operational */ return -ENODEV; @@ -387,8 +388,10 @@ cio_modify (struct subchannel *sch) return ret; } -/* - * Enable subchannel. +/** + * cio_enable_subchannel - enable a subchannel. + * @sch: subchannel to be enabled + * @intparm: interruption parameter to set */ int cio_enable_subchannel(struct subchannel *sch, u32 intparm) { @@ -434,12 +437,13 @@ int cio_enable_subchannel(struct subchannel *sch, u32 intparm) CIO_TRACE_EVENT (2, dbf_txt); return ret; } +EXPORT_SYMBOL_GPL(cio_enable_subchannel); -/* - * Disable subchannel. +/** + * cio_disable_subchannel - disable a subchannel. + * @sch: subchannel to disable */ -int -cio_disable_subchannel (struct subchannel *sch) +int cio_disable_subchannel(struct subchannel *sch) { char dbf_txt[15]; int ccode; @@ -455,7 +459,7 @@ cio_disable_subchannel (struct subchannel *sch) if (ccode == 3) /* Not operational. */ return -ENODEV; - if (sch->schib.scsw.actl != 0) + if (scsw_actl(&sch->schib.scsw) != 0) /* * the disable function must not be called while there are * requests pending for completion ! @@ -484,6 +488,7 @@ cio_disable_subchannel (struct subchannel *sch) CIO_TRACE_EVENT (2, dbf_txt); return ret; } +EXPORT_SYMBOL_GPL(cio_disable_subchannel); int cio_create_sch_lock(struct subchannel *sch) { @@ -494,27 +499,61 @@ int cio_create_sch_lock(struct subchannel *sch) return 0; } -/* - * cio_validate_subchannel() +static int cio_check_devno_blacklisted(struct subchannel *sch) +{ + 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(6, "Blacklisted device detected " + "at devno %04X, subchannel set %x\n", + sch->schib.pmcw.dev, sch->schid.ssid); + return -ENODEV; + } + return 0; +} + +static int cio_validate_io_subchannel(struct subchannel *sch) +{ + /* Initialization for io subchannels. */ + if (!css_sch_is_valid(&sch->schib)) + return -ENODEV; + + /* Devno is valid. */ + return cio_check_devno_blacklisted(sch); +} + +static int cio_validate_msg_subchannel(struct subchannel *sch) +{ + /* Initialization for message subchannels. */ + if (!css_sch_is_valid(&sch->schib)) + return -ENODEV; + + /* Devno is valid. */ + return cio_check_devno_blacklisted(sch); +} + +/** + * cio_validate_subchannel - basic validation of subchannel + * @sch: subchannel structure to be filled out + * @schid: subchannel id * * Find out subchannel type and initialize struct subchannel. * Return codes: - * 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 + * 0 on success * -ENXIO for non-defined subchannels - * -ENODEV for subchannels with invalid device number or blacklisted devices + * -ENODEV for invalid subchannels or blacklisted devices + * -EIO for subchannels in an invalid subchannel set */ -int -cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid) +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); + sprintf(dbf_txt, "valsch%x", schid.sch_no); + CIO_TRACE_EVENT(4, dbf_txt); /* Nuke all fields. */ memset(sch, 0, sizeof(struct subchannel)); @@ -546,65 +585,21 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid) /* Copy subchannel type from path management control word. */ sch->st = sch->schib.pmcw.st; - /* - * ... just being curious we check for non I/O subchannels - */ - if (sch->st != 0) { - CIO_MSG_EVENT(4, "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; + switch (sch->st) { + case SUBCHANNEL_TYPE_IO: + err = cio_validate_io_subchannel(sch); + break; + case SUBCHANNEL_TYPE_MSG: + err = cio_validate_msg_subchannel(sch); + break; + default: + err = 0; } - - /* Initialization for io subchannels. */ - if (!css_sch_is_valid(&sch->schib)) { - err = -ENODEV; + if (err) 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(6, "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; - sch->isc = 3; - - CIO_MSG_EVENT(6, "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 ... - * ... 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.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; + CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", + sch->schid.ssid, sch->schid.sch_no, sch->st); return 0; out: if (!cio_is_console(schid)) @@ -645,7 +640,7 @@ do_IRQ (struct pt_regs *regs) */ if (tpi_info->adapter_IO == 1 && tpi_info->int_type == IO_INTERRUPT_TYPE) { - do_adapter_IO(); + do_adapter_IO(tpi_info->isc); continue; } sch = (struct subchannel *)(unsigned long)tpi_info->intparm; @@ -704,9 +699,9 @@ void wait_cons_dev(void) if (!console_subchannel_in_use) return; - /* disable all but isc 7 (console device) */ + /* disable all but the console isc */ __ctl_store (save_cr6, 6, 6); - cr6 = 0x01000000; + cr6 = 1UL << (31 - CONSOLE_ISC); __ctl_load (cr6, 6, 6); do { @@ -714,7 +709,7 @@ void wait_cons_dev(void) if (!cio_tpi()) cpu_relax(); spin_lock(console_subchannel.lock); - } while (console_subchannel.schib.scsw.actl != 0); + } while (console_subchannel.schib.scsw.cmd.actl != 0); /* * restore previous isc value */ @@ -759,7 +754,6 @@ cio_get_console_sch_no(void) /* 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; @@ -776,6 +770,7 @@ cio_probe_console(void) sch_no = cio_get_console_sch_no(); if (sch_no == -1) { console_subchannel_in_use = 0; + printk(KERN_WARNING "cio: No ccw console found!\n"); return ERR_PTR(-ENODEV); } memset(&console_subchannel, 0, sizeof(struct subchannel)); @@ -788,15 +783,15 @@ cio_probe_console(void) } /* - * enable console I/O-interrupt subclass 7 + * enable console I/O-interrupt subclass */ - ctl_set_bit(6, 24); - console_subchannel.isc = 7; - console_subchannel.schib.pmcw.isc = 7; + isc_register(CONSOLE_ISC); + console_subchannel.schib.pmcw.isc = CONSOLE_ISC; console_subchannel.schib.pmcw.intparm = (u32)(addr_t)&console_subchannel; ret = cio_modify(&console_subchannel); if (ret) { + isc_unregister(CONSOLE_ISC); console_subchannel_in_use = 0; return ERR_PTR(ret); } @@ -808,7 +803,7 @@ cio_release_console(void) { console_subchannel.schib.pmcw.intparm = 0; cio_modify(&console_subchannel); - ctl_clear_bit(6, 24); + isc_unregister(CONSOLE_ISC); console_subchannel_in_use = 0; } @@ -862,7 +857,7 @@ static void udelay_reset(unsigned long usecs) } static int -__clear_subchannel_easy(struct subchannel_id schid) +__clear_io_subchannel_easy(struct subchannel_id schid) { int retry; @@ -881,6 +876,12 @@ __clear_subchannel_easy(struct subchannel_id schid) return -EBUSY; } +static void __clear_chsc_subchannel_easy(void) +{ + /* It seems we can only wait for a bit here :/ */ + udelay_reset(100); +} + static int pgm_check_occured; static void cio_reset_pgm_check_handler(void) @@ -919,11 +920,22 @@ static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) case -ENODEV: break; default: /* -EBUSY */ - if (__clear_subchannel_easy(schid)) - break; /* give up... */ + switch (schib.pmcw.st) { + case SUBCHANNEL_TYPE_IO: + if (__clear_io_subchannel_easy(schid)) + goto out; /* give up... */ + break; + case SUBCHANNEL_TYPE_CHSC: + __clear_chsc_subchannel_easy(); + break; + default: + /* No default clear strategy */ + break; + } stsch(schid, &schib); __disable_subchannel_easy(schid, &schib); } +out: return 0; } @@ -1066,3 +1078,61 @@ int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) iplinfo->is_qdio = schib.pmcw.qf; return 0; } + +/** + * cio_tm_start_key - perform start function + * @sch: subchannel on which to perform the start function + * @tcw: transport-command word to be started + * @lpm: mask of paths to use + * @key: storage key to use for storage access + * + * Start the tcw on the given subchannel. Return zero on success, non-zero + * otherwise. + */ +int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) +{ + int cc; + union orb *orb = &to_io_private(sch)->orb; + + memset(orb, 0, sizeof(union orb)); + orb->tm.intparm = (u32) (addr_t) sch; + orb->tm.key = key >> 4; + orb->tm.b = 1; + orb->tm.lpm = lpm ? lpm : sch->lpm; + orb->tm.tcw = (u32) (addr_t) tcw; + cc = ssch(sch->schid, orb); + switch (cc) { + case 0: + return 0; + case 1: + case 2: + return -EBUSY; + default: + return cio_start_handle_notoper(sch, lpm); + } +} + +/** + * cio_tm_intrg - perform interrogate function + * @sch - subchannel on which to perform the interrogate function + * + * If the specified subchannel is running in transport-mode, perform the + * interrogate function. Return zero on success, non-zero otherwie. + */ +int cio_tm_intrg(struct subchannel *sch) +{ + int cc; + + if (!to_io_private(sch)->orb.tm.b) + return -EINVAL; + cc = xsch(sch->schid); + switch (cc) { + case 0: + case 2: + return 0; + case 1: + return -EBUSY; + default: + return -ENODEV; + } +} |