X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=blobdiff_plain;f=drivers%2Fs390%2Fcio%2Fcss.c;h=46c021d880dc5ee7441cd11f8e885bf54d79b7dd;hp=a76956512b2d41963a0bd89ddba91a69f7b2553a;hb=a3da5bf84a97d48cfaf66c6842470fc403da5121;hpb=3e1b83ab3912a6f583897635bee0a2e0cd1545f7 diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index a76956512b2d..46c021d880dc 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -2,8 +2,7 @@ * drivers/s390/cio/css.c * driver for channel subsystem * - * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, - * IBM Corporation + * Copyright IBM Corp. 2002,2008 * Author(s): Arnd Bergmann (arndb@de.ibm.com) * Cornelia Huck (cornelia.huck@de.ibm.com) */ @@ -14,7 +13,9 @@ #include #include #include +#include +#include "../s390mach.h" #include "css.h" #include "cio.h" #include "cio_debug.h" @@ -30,8 +31,6 @@ static int max_ssid = 0; struct channel_subsystem *channel_subsystems[__MAX_CSSID + 1]; -int css_characteristics_avail = 0; - int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data) { @@ -121,25 +120,6 @@ css_alloc_subchannel(struct subchannel_id schid) kfree(sch); return ERR_PTR(ret); } - - if (sch->st != SUBCHANNEL_TYPE_IO) { - /* For now we ignore all non-io subchannels. */ - kfree(sch); - return ERR_PTR(-EINVAL); - } - - /* - * Set intparm to subchannel address. - * This is fine even on 64bit since the subchannel is always located - * under 2G. - */ - sch->schib.pmcw.intparm = (u32)(addr_t)sch; - ret = cio_modify(sch); - if (ret) { - kfree(sch->lock); - kfree(sch); - return ERR_PTR(ret); - } return sch; } @@ -177,12 +157,18 @@ static int css_sch_device_register(struct subchannel *sch) return ret; } +/** + * css_sch_device_unregister - unregister a subchannel + * @sch: subchannel to be unregistered + */ void css_sch_device_unregister(struct subchannel *sch) { mutex_lock(&sch->reg_mutex); - device_unregister(&sch->dev); + if (device_is_registered(&sch->dev)) + device_unregister(&sch->dev); mutex_unlock(&sch->reg_mutex); } +EXPORT_SYMBOL_GPL(css_sch_device_unregister); static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) { @@ -229,6 +215,41 @@ void css_update_ssd_info(struct subchannel *sch) } } +static ssize_t type_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct subchannel *sch = to_subchannel(dev); + + return sprintf(buf, "%01x\n", sch->st); +} + +static DEVICE_ATTR(type, 0444, type_show, NULL); + +static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct subchannel *sch = to_subchannel(dev); + + return sprintf(buf, "css:t%01X\n", sch->st); +} + +static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); + +static struct attribute *subch_attrs[] = { + &dev_attr_type.attr, + &dev_attr_modalias.attr, + NULL, +}; + +static struct attribute_group subch_attr_group = { + .attrs = subch_attrs, +}; + +static struct attribute_group *default_subch_attr_groups[] = { + &subch_attr_group, + NULL, +}; + static int css_register_subchannel(struct subchannel *sch) { int ret; @@ -237,16 +258,17 @@ static int css_register_subchannel(struct subchannel *sch) sch->dev.parent = &channel_subsystems[0]->device; sch->dev.bus = &css_bus_type; sch->dev.release = &css_subchannel_release; - sch->dev.groups = subch_attr_groups; + sch->dev.groups = default_subch_attr_groups; /* * We don't want to generate uevents for I/O subchannels that don't * have a working ccw device behind them since they will be * unregistered before they can be used anyway, so we delay the add * uevent until after device recognition was successful. + * Note that we suppress the uevent for all subchannel types; + * the subchannel driver can decide itself when it wants to inform + * userspace of its existence. */ - if (!cio_is_console(sch->schid)) - /* Console is special, no need to suppress. */ - sch->dev.uevent_suppress = 1; + sch->dev.uevent_suppress = 1; css_update_ssd_info(sch); /* make it known to the system */ ret = css_sch_device_register(sch); @@ -255,10 +277,19 @@ static int css_register_subchannel(struct subchannel *sch) sch->schid.ssid, sch->schid.sch_no, ret); return ret; } + if (!sch->driver) { + /* + * No driver matched. Generate the uevent now so that + * a fitting driver module may be loaded based on the + * modalias. + */ + sch->dev.uevent_suppress = 0; + kobject_uevent(&sch->dev.kobj, KOBJ_ADD); + } return ret; } -static int css_probe_device(struct subchannel_id schid) +int css_probe_device(struct subchannel_id schid) { int ret; struct subchannel *sch; @@ -301,116 +332,12 @@ int css_sch_is_valid(struct schib *schib) { if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) return 0; + if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) + return 0; return 1; } EXPORT_SYMBOL_GPL(css_sch_is_valid); -static int css_get_subchannel_status(struct subchannel *sch) -{ - struct schib schib; - - if (stsch(sch->schid, &schib)) - return CIO_GONE; - if (!css_sch_is_valid(&schib)) - return CIO_GONE; - if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev)) - return CIO_REVALIDATE; - if (!sch->lpm) - return CIO_NO_PATH; - return CIO_OPER; -} - -static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) -{ - int event, ret, disc; - unsigned long flags; - enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE } action; - - spin_lock_irqsave(sch->lock, flags); - disc = device_is_disconnected(sch); - if (disc && slow) { - /* Disconnected devices are evaluated directly only.*/ - spin_unlock_irqrestore(sch->lock, flags); - return 0; - } - /* No interrupt after machine check - kill pending timers. */ - device_kill_pending_timer(sch); - if (!disc && !slow) { - /* Non-disconnected devices are evaluated on the slow path. */ - spin_unlock_irqrestore(sch->lock, flags); - return -EAGAIN; - } - event = css_get_subchannel_status(sch); - CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n", - sch->schid.ssid, sch->schid.sch_no, event, - disc ? "disconnected" : "normal", - slow ? "slow" : "fast"); - /* Analyze subchannel status. */ - action = NONE; - switch (event) { - case CIO_NO_PATH: - if (disc) { - /* Check if paths have become available. */ - action = REPROBE; - break; - } - /* fall through */ - case CIO_GONE: - /* Prevent unwanted effects when opening lock. */ - cio_disable_subchannel(sch); - device_set_disconnected(sch); - /* Ask driver what to do with device. */ - action = UNREGISTER; - if (sch->driver && sch->driver->notify) { - spin_unlock_irqrestore(sch->lock, flags); - ret = sch->driver->notify(sch, event); - spin_lock_irqsave(sch->lock, flags); - if (ret) - action = NONE; - } - break; - case CIO_REVALIDATE: - /* Device will be removed, so no notify necessary. */ - if (disc) - /* Reprobe because immediate unregister might block. */ - action = REPROBE; - else - action = UNREGISTER_PROBE; - break; - case CIO_OPER: - if (disc) - /* Get device operational again. */ - action = REPROBE; - break; - } - /* Perform action. */ - ret = 0; - switch (action) { - case UNREGISTER: - case UNREGISTER_PROBE: - /* Unregister device (will use subchannel lock). */ - spin_unlock_irqrestore(sch->lock, flags); - css_sch_device_unregister(sch); - spin_lock_irqsave(sch->lock, flags); - - /* Reset intparm to zeroes. */ - sch->schib.pmcw.intparm = 0; - cio_modify(sch); - break; - case REPROBE: - device_trigger_reprobe(sch); - break; - default: - break; - } - spin_unlock_irqrestore(sch->lock, flags); - /* Probe if necessary. */ - if (action == UNREGISTER_PROBE) - ret = css_probe_device(sch->schid); - - return ret; -} - static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) { struct schib schib; @@ -429,6 +356,21 @@ static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) return css_probe_device(schid); } +static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) +{ + int ret = 0; + + if (sch->driver) { + if (sch->driver->sch_event) + ret = sch->driver->sch_event(sch, slow); + else + dev_dbg(&sch->dev, + "Got subchannel machine check but " + "no sch_event handler provided.\n"); + } + return ret; +} + static void css_evaluate_subchannel(struct subchannel_id schid, int slow) { struct subchannel *sch; @@ -596,18 +538,29 @@ EXPORT_SYMBOL_GPL(css_schedule_reprobe); /* * Called from the machine check handler for subchannel report words. */ -void css_process_crw(int rsid1, int rsid2) +static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) { struct subchannel_id mchk_schid; - CIO_CRW_EVENT(2, "source is subchannel %04X, subsystem id %x\n", - rsid1, rsid2); + if (overflow) { + css_schedule_eval_all(); + return; + } + CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, " + "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", + crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, + crw0->erc, crw0->rsid); + if (crw1) + CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, " + "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", + crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, + crw1->anc, crw1->erc, crw1->rsid); init_subchannel_id(&mchk_schid); - mchk_schid.sch_no = rsid1; - if (rsid2 != 0) - mchk_schid.ssid = (rsid2 >> 8) & 3; + mchk_schid.sch_no = crw0->rsid; + if (crw1) + mchk_schid.ssid = (crw1->rsid >> 8) & 3; - /* + /* * Since we are always presented with IPI in the CRW, we have to * use stsch() to find out if the subchannel in question has come * or gone. @@ -658,7 +611,7 @@ __init_channel_subsystem(struct subchannel_id schid, void *data) static void __init css_generate_pgid(struct channel_subsystem *css, u32 tod_high) { - if (css_characteristics_avail && css_general_characteristics.mcss) { + if (css_general_characteristics.mcss) { css->global_pgid.pgid_high.ext_cssid.version = 0x80; css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; } else { @@ -795,8 +748,6 @@ init_channel_subsystem (void) ret = chsc_determine_css_characteristics(); if (ret == -ENOMEM) goto out; /* No need to continue. */ - if (ret == 0) - css_characteristics_avail = 1; ret = chsc_alloc_sei_area(); if (ret) @@ -806,6 +757,10 @@ init_channel_subsystem (void) if (ret) goto out; + ret = s390_register_crw_handler(CRW_RSC_SCH, css_process_crw); + if (ret) + goto out; + if ((ret = bus_register(&css_bus_type))) goto out; @@ -836,8 +791,7 @@ init_channel_subsystem (void) ret = device_register(&css->device); if (ret) goto out_free_all; - if (css_characteristics_avail && - css_chsc_characteristics.secm) { + if (css_chsc_characteristics.secm) { ret = device_create_file(&css->device, &dev_attr_cm_enable); if (ret) @@ -852,7 +806,8 @@ init_channel_subsystem (void) goto out_pseudo; css_init_done = 1; - ctl_set_bit(6, 28); + /* Enable default isc for I/O subchannels. */ + isc_register(IO_SCH_ISC); for_each_subchannel(__init_channel_subsystem, NULL); return 0; @@ -875,7 +830,7 @@ out_unregister: i--; css = channel_subsystems[i]; device_unregister(&css->pseudo_subchannel->dev); - if (css_characteristics_avail && css_chsc_characteristics.secm) + if (css_chsc_characteristics.secm) device_remove_file(&css->device, &dev_attr_cm_enable); device_unregister(&css->device); @@ -883,6 +838,7 @@ out_unregister: out_bus: bus_unregister(&css_bus_type); out: + s390_unregister_crw_handler(CRW_RSC_CSS); chsc_free_sei_area(); kfree(slow_subchannel_set); printk(KERN_WARNING"cio: failed to initialize css driver (%d)!\n", @@ -895,19 +851,16 @@ int sch_is_pseudo_sch(struct subchannel *sch) return sch == to_css(sch->dev.parent)->pseudo_subchannel; } -/* - * find a driver for a subchannel. They identify by the subchannel - * type with the exception that the console subchannel driver has its own - * subchannel type although the device is an i/o subchannel - */ -static int -css_bus_match (struct device *dev, struct device_driver *drv) +static int css_bus_match(struct device *dev, struct device_driver *drv) { struct subchannel *sch = to_subchannel(dev); struct css_driver *driver = to_cssdriver(drv); + struct css_device_id *id; - if (sch->st == driver->subchannel_type) - return 1; + for (id = driver->subchannel_type; id->match_flags; id++) { + if (sch->st == id->type) + return 1; + } return 0; } @@ -945,12 +898,25 @@ static void css_shutdown(struct device *dev) sch->driver->shutdown(sch); } +static int css_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct subchannel *sch = to_subchannel(dev); + int ret; + + ret = add_uevent_var(env, "ST=%01X", sch->st); + if (ret) + return ret; + ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st); + return ret; +} + struct bus_type css_bus_type = { .name = "css", .match = css_bus_match, .probe = css_probe, .remove = css_remove, .shutdown = css_shutdown, + .uevent = css_uevent, }; /** @@ -985,4 +951,3 @@ subsys_initcall(init_channel_subsystem); MODULE_LICENSE("GPL"); EXPORT_SYMBOL(css_bus_type); -EXPORT_SYMBOL_GPL(css_characteristics_avail);