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drivers/s390/cio/css.c
29.3 KB
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/* |
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* driver for channel subsystem |
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* |
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* Copyright IBM Corp. 2002, 2010 |
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* * Author(s): Arnd Bergmann (arndb@de.ibm.com) * Cornelia Huck (cornelia.huck@de.ibm.com) |
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*/ |
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#define KMSG_COMPONENT "cio" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
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#include <linux/module.h> #include <linux/init.h> #include <linux/device.h> #include <linux/slab.h> #include <linux/errno.h> #include <linux/list.h> |
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#include <linux/reboot.h> |
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#include <linux/suspend.h> |
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#include <linux/proc_fs.h> |
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#include <asm/isc.h> |
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#include <asm/crw.h> |
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#include "css.h" #include "cio.h" #include "cio_debug.h" #include "ioasm.h" #include "chsc.h" |
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#include "device.h" |
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#include "idset.h" |
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#include "chp.h" |
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int css_init_done = 0; |
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int max_ssid; |
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struct channel_subsystem *channel_subsystems[__MAX_CSSID + 1]; |
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static struct bus_type css_bus_type; |
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int |
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for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data) { struct subchannel_id schid; int ret; init_subchannel_id(&schid); ret = -ENODEV; do { |
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do { ret = fn(schid, data); if (ret) break; } while (schid.sch_no++ < __MAX_SUBCHANNEL); schid.sch_no = 0; } while (schid.ssid++ < max_ssid); |
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return ret; } |
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struct cb_data { void *data; struct idset *set; int (*fn_known_sch)(struct subchannel *, void *); int (*fn_unknown_sch)(struct subchannel_id, void *); }; static int call_fn_known_sch(struct device *dev, void *data) { struct subchannel *sch = to_subchannel(dev); struct cb_data *cb = data; int rc = 0; |
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if (cb->set) idset_sch_del(cb->set, sch->schid); |
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if (cb->fn_known_sch) rc = cb->fn_known_sch(sch, cb->data); return rc; } static int call_fn_unknown_sch(struct subchannel_id schid, void *data) { struct cb_data *cb = data; int rc = 0; if (idset_sch_contains(cb->set, schid)) rc = cb->fn_unknown_sch(schid, cb->data); return rc; } |
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static int call_fn_all_sch(struct subchannel_id schid, void *data) { struct cb_data *cb = data; struct subchannel *sch; int rc = 0; sch = get_subchannel_by_schid(schid); if (sch) { if (cb->fn_known_sch) rc = cb->fn_known_sch(sch, cb->data); put_device(&sch->dev); } else { if (cb->fn_unknown_sch) rc = cb->fn_unknown_sch(schid, cb->data); } return rc; } |
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int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), int (*fn_unknown)(struct subchannel_id, void *), void *data) { struct cb_data cb; int rc; |
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cb.data = data; cb.fn_known_sch = fn_known; cb.fn_unknown_sch = fn_unknown; |
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if (fn_known && !fn_unknown) { /* Skip idset allocation in case of known-only loop. */ cb.set = NULL; return bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch); } |
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cb.set = idset_sch_new(); if (!cb.set) /* fall back to brute force scanning in case of oom */ return for_each_subchannel(call_fn_all_sch, &cb); idset_fill(cb.set); |
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/* Process registered subchannels. */ rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch); if (rc) goto out; /* Process unregistered subchannels. */ if (fn_unknown) rc = for_each_subchannel(call_fn_unknown_sch, &cb); out: idset_free(cb.set); return rc; } |
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static void css_sch_todo(struct work_struct *work); |
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static int css_sch_create_locks(struct subchannel *sch) { sch->lock = kmalloc(sizeof(*sch->lock), GFP_KERNEL); if (!sch->lock) return -ENOMEM; spin_lock_init(sch->lock); mutex_init(&sch->reg_mutex); return 0; } |
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static void css_subchannel_release(struct device *dev) { |
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struct subchannel *sch = to_subchannel(dev); |
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sch->config.intparm = 0; cio_commit_config(sch); kfree(sch->lock); kfree(sch); |
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} |
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struct subchannel *css_alloc_subchannel(struct subchannel_id schid) |
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{ struct subchannel *sch; int ret; |
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sch = kzalloc(sizeof(*sch), GFP_KERNEL | GFP_DMA); if (!sch) |
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return ERR_PTR(-ENOMEM); |
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ret = cio_validate_subchannel(sch, schid); if (ret < 0) goto err; ret = css_sch_create_locks(sch); if (ret) goto err; |
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INIT_WORK(&sch->todo_work, css_sch_todo); |
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sch->dev.release = &css_subchannel_release; device_initialize(&sch->dev); |
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return sch; |
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err: kfree(sch); return ERR_PTR(ret); |
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} |
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static int css_sch_device_register(struct subchannel *sch) |
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{ int ret; mutex_lock(&sch->reg_mutex); |
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dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid, sch->schid.sch_no); |
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ret = device_add(&sch->dev); |
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mutex_unlock(&sch->reg_mutex); return ret; } |
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/** * css_sch_device_unregister - unregister a subchannel * @sch: subchannel to be unregistered */ |
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void css_sch_device_unregister(struct subchannel *sch) { mutex_lock(&sch->reg_mutex); |
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if (device_is_registered(&sch->dev)) device_unregister(&sch->dev); |
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mutex_unlock(&sch->reg_mutex); } |
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EXPORT_SYMBOL_GPL(css_sch_device_unregister); |
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static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) { int i; int mask; memset(ssd, 0, sizeof(struct chsc_ssd_info)); ssd->path_mask = pmcw->pim; for (i = 0; i < 8; i++) { mask = 0x80 >> i; if (pmcw->pim & mask) { chp_id_init(&ssd->chpid[i]); ssd->chpid[i].id = pmcw->chpid[i]; } } } static void ssd_register_chpids(struct chsc_ssd_info *ssd) { int i; int mask; for (i = 0; i < 8; i++) { mask = 0x80 >> i; if (ssd->path_mask & mask) if (!chp_is_registered(ssd->chpid[i])) chp_new(ssd->chpid[i]); } } void css_update_ssd_info(struct subchannel *sch) { int ret; |
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ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info); if (ret) |
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ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); |
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ssd_register_chpids(&sch->ssd_info); |
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} |
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static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf) { struct subchannel *sch = to_subchannel(dev); return sprintf(buf, "%01x ", 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 ", 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, }; |
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static const struct attribute_group *default_subch_attr_groups[] = { |
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&subch_attr_group, NULL, }; |
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int css_register_subchannel(struct subchannel *sch) |
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{ int ret; /* Initialize the subchannel structure */ |
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sch->dev.parent = &channel_subsystems[0]->device; |
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sch->dev.bus = &css_bus_type; |
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sch->dev.groups = default_subch_attr_groups; |
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/* * 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. |
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* 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. |
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*/ |
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dev_set_uevent_suppress(&sch->dev, 1); |
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css_update_ssd_info(sch); |
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/* make it known to the system */ |
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ret = css_sch_device_register(sch); |
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if (ret) { |
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CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d ", sch->schid.ssid, sch->schid.sch_no, ret); |
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return ret; } |
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if (!sch->driver) { /* * No driver matched. Generate the uevent now so that * a fitting driver module may be loaded based on the * modalias. */ |
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dev_set_uevent_suppress(&sch->dev, 0); |
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kobject_uevent(&sch->dev.kobj, KOBJ_ADD); } |
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return ret; } |
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static int css_probe_device(struct subchannel_id schid) |
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{ |
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struct subchannel *sch; |
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int ret; |
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sch = css_alloc_subchannel(schid); if (IS_ERR(sch)) return PTR_ERR(sch); |
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ret = css_register_subchannel(sch); |
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if (ret) put_device(&sch->dev); |
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return ret; } |
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static int check_subchannel(struct device * dev, void * data) { struct subchannel *sch; |
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struct subchannel_id *schid = data; |
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sch = to_subchannel(dev); |
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return schid_equal(&sch->schid, schid); |
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} |
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struct subchannel * |
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get_subchannel_by_schid(struct subchannel_id schid) |
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{ |
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struct device *dev; |
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dev = bus_find_device(&css_bus_type, NULL, |
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&schid, check_subchannel); |
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return dev ? to_subchannel(dev) : NULL; |
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} |
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/** * css_sch_is_valid() - check if a subchannel is valid * @schib: subchannel information block for the subchannel */ int css_sch_is_valid(struct schib *schib) { if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) return 0; |
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if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) return 0; |
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return 1; } EXPORT_SYMBOL_GPL(css_sch_is_valid); |
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static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) { struct schib schib; if (!slow) { /* Will be done on the slow path. */ return -EAGAIN; } |
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if (stsch_err(schid, &schib)) { /* Subchannel is not provided. */ return -ENXIO; } if (!css_sch_is_valid(&schib)) { |
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/* Unusable - ignore. */ return 0; |
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} |
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CIO_MSG_EVENT(4, "event: sch 0.%x.%04x, new ", schid.ssid, schid.sch_no); |
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return css_probe_device(schid); } |
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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. "); } |
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if (ret != 0 && ret != -EAGAIN) { CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d ", sch->schid.ssid, sch->schid.sch_no, ret); } |
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return ret; } |
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static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
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{ struct subchannel *sch; int ret; sch = get_subchannel_by_schid(schid); if (sch) { ret = css_evaluate_known_subchannel(sch, slow); put_device(&sch->dev); } else ret = css_evaluate_new_subchannel(schid, slow); |
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if (ret == -EAGAIN) css_schedule_eval(schid); |
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} |
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/** * css_sched_sch_todo - schedule a subchannel operation * @sch: subchannel * @todo: todo * * Schedule the operation identified by @todo to be performed on the slow path * workqueue. Do nothing if another operation with higher priority is already * scheduled. Needs to be called with subchannel lock held. */ void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo) { CIO_MSG_EVENT(4, "sch_todo: sched sch=0.%x.%04x todo=%d ", sch->schid.ssid, sch->schid.sch_no, todo); if (sch->todo >= todo) return; /* Get workqueue ref. */ if (!get_device(&sch->dev)) return; sch->todo = todo; if (!queue_work(cio_work_q, &sch->todo_work)) { /* Already queued, release workqueue ref. */ put_device(&sch->dev); } } |
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EXPORT_SYMBOL_GPL(css_sched_sch_todo); |
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static void css_sch_todo(struct work_struct *work) { struct subchannel *sch; enum sch_todo todo; int ret; sch = container_of(work, struct subchannel, todo_work); /* Find out todo. */ spin_lock_irq(sch->lock); todo = sch->todo; CIO_MSG_EVENT(4, "sch_todo: sch=0.%x.%04x, todo=%d ", sch->schid.ssid, sch->schid.sch_no, todo); sch->todo = SCH_TODO_NOTHING; spin_unlock_irq(sch->lock); /* Perform todo. */ switch (todo) { case SCH_TODO_NOTHING: break; case SCH_TODO_EVAL: ret = css_evaluate_known_subchannel(sch, 1); if (ret == -EAGAIN) { spin_lock_irq(sch->lock); css_sched_sch_todo(sch, todo); spin_unlock_irq(sch->lock); } break; case SCH_TODO_UNREG: css_sch_device_unregister(sch); break; } /* Release workqueue ref. */ put_device(&sch->dev); } |
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static struct idset *slow_subchannel_set; static spinlock_t slow_subchannel_lock; |
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static wait_queue_head_t css_eval_wq; static atomic_t css_eval_scheduled; |
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static int __init slow_subchannel_init(void) |
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{ |
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spin_lock_init(&slow_subchannel_lock); |
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atomic_set(&css_eval_scheduled, 0); init_waitqueue_head(&css_eval_wq); |
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slow_subchannel_set = idset_sch_new(); if (!slow_subchannel_set) { |
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CIO_MSG_EVENT(0, "could not allocate slow subchannel set "); |
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return -ENOMEM; } return 0; |
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} |
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static int slow_eval_known_fn(struct subchannel *sch, void *data) |
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{ |
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int eval; int rc; |
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spin_lock_irq(&slow_subchannel_lock); |
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eval = idset_sch_contains(slow_subchannel_set, sch->schid); idset_sch_del(slow_subchannel_set, sch->schid); spin_unlock_irq(&slow_subchannel_lock); if (eval) { rc = css_evaluate_known_subchannel(sch, 1); if (rc == -EAGAIN) css_schedule_eval(sch->schid); |
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} |
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return 0; } static int slow_eval_unknown_fn(struct subchannel_id schid, void *data) { int eval; int rc = 0; spin_lock_irq(&slow_subchannel_lock); eval = idset_sch_contains(slow_subchannel_set, schid); idset_sch_del(slow_subchannel_set, schid); |
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spin_unlock_irq(&slow_subchannel_lock); |
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if (eval) { rc = css_evaluate_new_subchannel(schid, 1); switch (rc) { case -EAGAIN: css_schedule_eval(schid); rc = 0; break; case -ENXIO: case -ENOMEM: case -EIO: /* These should abort looping */ |
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spin_lock_irq(&slow_subchannel_lock); |
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idset_sch_del_subseq(slow_subchannel_set, schid); |
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spin_unlock_irq(&slow_subchannel_lock); |
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break; default: rc = 0; } |
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/* Allow scheduling here since the containing loop might * take a while. */ cond_resched(); |
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} return rc; } static void css_slow_path_func(struct work_struct *unused) { |
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unsigned long flags; |
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CIO_TRACE_EVENT(4, "slowpath"); for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn, NULL); |
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spin_lock_irqsave(&slow_subchannel_lock, flags); if (idset_is_empty(slow_subchannel_set)) { atomic_set(&css_eval_scheduled, 0); wake_up(&css_eval_wq); } spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
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} |
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static DECLARE_DELAYED_WORK(slow_path_work, css_slow_path_func); |
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struct workqueue_struct *cio_work_q; |
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void css_schedule_eval(struct subchannel_id schid) { unsigned long flags; spin_lock_irqsave(&slow_subchannel_lock, flags); idset_sch_add(slow_subchannel_set, schid); |
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atomic_set(&css_eval_scheduled, 1); |
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queue_delayed_work(cio_work_q, &slow_path_work, 0); |
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spin_unlock_irqrestore(&slow_subchannel_lock, flags); } void css_schedule_eval_all(void) { unsigned long flags; spin_lock_irqsave(&slow_subchannel_lock, flags); idset_fill(slow_subchannel_set); |
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atomic_set(&css_eval_scheduled, 1); |
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queue_delayed_work(cio_work_q, &slow_path_work, 0); |
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spin_unlock_irqrestore(&slow_subchannel_lock, flags); } |
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584 |
static int __unset_registered(struct device *dev, void *data) |
22806dc1a
|
585 |
{ |
703e5c999
|
586 587 |
struct idset *set = data; struct subchannel *sch = to_subchannel(dev); |
40154b824
|
588 |
|
703e5c999
|
589 590 |
idset_sch_del(set, sch->schid); return 0; |
56e25e977
|
591 |
} |
175746eb0
|
592 |
void css_schedule_eval_all_unreg(unsigned long delay) |
40154b824
|
593 |
{ |
703e5c999
|
594 595 |
unsigned long flags; struct idset *unreg_set; |
40154b824
|
596 |
|
703e5c999
|
597 598 599 600 601 |
/* Find unregistered subchannels. */ unreg_set = idset_sch_new(); if (!unreg_set) { /* Fallback. */ css_schedule_eval_all(); |
56e25e977
|
602 603 |
return; } |
703e5c999
|
604 605 606 607 608 609 |
idset_fill(unreg_set); bus_for_each_dev(&css_bus_type, NULL, unreg_set, __unset_registered); /* Apply to slow_subchannel_set. */ spin_lock_irqsave(&slow_subchannel_lock, flags); idset_add_set(slow_subchannel_set, unreg_set); atomic_set(&css_eval_scheduled, 1); |
175746eb0
|
610 |
queue_delayed_work(cio_work_q, &slow_path_work, delay); |
703e5c999
|
611 612 |
spin_unlock_irqrestore(&slow_subchannel_lock, flags); idset_free(unreg_set); |
40154b824
|
613 |
} |
703e5c999
|
614 615 |
void css_wait_for_slow_path(void) { |
be5d3823f
|
616 |
flush_workqueue(cio_work_q); |
703e5c999
|
617 |
} |
40154b824
|
618 619 620 621 |
/* Schedule reprobing of all unregistered subchannels. */ void css_schedule_reprobe(void) { |
175746eb0
|
622 623 |
/* Schedule with a delay to allow merging of subsequent calls. */ css_schedule_eval_all_unreg(1 * HZ); |
40154b824
|
624 |
} |
40154b824
|
625 |
EXPORT_SYMBOL_GPL(css_schedule_reprobe); |
1da177e4c
|
626 |
/* |
1da177e4c
|
627 628 |
* Called from the machine check handler for subchannel report words. */ |
c11561897
|
629 |
static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) |
1da177e4c
|
630 |
{ |
a8237fc41
|
631 |
struct subchannel_id mchk_schid; |
4bc4e965d
|
632 |
struct subchannel *sch; |
1da177e4c
|
633 |
|
c11561897
|
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 |
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 ", 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 ", crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, crw1->anc, crw1->erc, crw1->rsid); |
a8237fc41
|
649 |
init_subchannel_id(&mchk_schid); |
c11561897
|
650 651 |
mchk_schid.sch_no = crw0->rsid; if (crw1) |
8d7bfb4a8
|
652 |
mchk_schid.ssid = (crw1->rsid >> 4) & 3; |
fb6958a59
|
653 |
|
4bc4e965d
|
654 655 656 657 658 659 660 |
if (crw0->erc == CRW_ERC_PMOD) { sch = get_subchannel_by_schid(mchk_schid); if (sch) { css_update_ssd_info(sch); put_device(&sch->dev); } } |
c11561897
|
661 |
/* |
1da177e4c
|
662 663 664 665 |
* 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. */ |
83b3370c7
|
666 |
css_evaluate_subchannel(mchk_schid, 0); |
1da177e4c
|
667 668 669 |
} static void __init |
a28c69448
|
670 |
css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4c
|
671 |
{ |
94038a991
|
672 |
struct cpuid cpu_id; |
75784c008
|
673 |
if (css_general_characteristics.mcss) { |
a28c69448
|
674 675 676 |
css->global_pgid.pgid_high.ext_cssid.version = 0x80; css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; } else { |
1da177e4c
|
677 |
#ifdef CONFIG_SMP |
7b4684880
|
678 |
css->global_pgid.pgid_high.cpu_addr = stap(); |
1da177e4c
|
679 |
#else |
a28c69448
|
680 |
css->global_pgid.pgid_high.cpu_addr = 0; |
1da177e4c
|
681 682 |
#endif } |
94038a991
|
683 684 685 |
get_cpu_id(&cpu_id); css->global_pgid.cpu_id = cpu_id.ident; css->global_pgid.cpu_model = cpu_id.machine; |
a28c69448
|
686 687 688 |
css->global_pgid.tod_high = tod_high; } |
3b793060e
|
689 690 691 692 693 694 |
static void channel_subsystem_release(struct device *dev) { struct channel_subsystem *css; css = to_css(dev); |
495a5b45a
|
695 |
mutex_destroy(&css->mutex); |
a2164b817
|
696 697 698 699 700 |
if (css->pseudo_subchannel) { /* Implies that it has been generated but never registered. */ css_subchannel_release(&css->pseudo_subchannel->dev); css->pseudo_subchannel = NULL; } |
3b793060e
|
701 702 |
kfree(css); } |
495a5b45a
|
703 704 705 706 707 |
static ssize_t css_cm_enable_show(struct device *dev, struct device_attribute *attr, char *buf) { struct channel_subsystem *css = to_css(dev); |
8284fb19e
|
708 |
int ret; |
495a5b45a
|
709 710 711 |
if (!css) return 0; |
8284fb19e
|
712 713 714 715 716 |
mutex_lock(&css->mutex); ret = sprintf(buf, "%x ", css->cm_enabled); mutex_unlock(&css->mutex); return ret; |
495a5b45a
|
717 718 719 720 721 722 723 724 |
} static ssize_t css_cm_enable_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct channel_subsystem *css = to_css(dev); int ret; |
2f9722023
|
725 |
unsigned long val; |
495a5b45a
|
726 |
|
0178722be
|
727 |
ret = kstrtoul(buf, 16, &val); |
2f9722023
|
728 729 |
if (ret) return ret; |
8284fb19e
|
730 |
mutex_lock(&css->mutex); |
2f9722023
|
731 732 |
switch (val) { case 0: |
495a5b45a
|
733 734 |
ret = css->cm_enabled ? chsc_secm(css, 0) : 0; break; |
2f9722023
|
735 |
case 1: |
495a5b45a
|
736 737 738 739 740 |
ret = css->cm_enabled ? 0 : chsc_secm(css, 1); break; default: ret = -EINVAL; } |
8284fb19e
|
741 |
mutex_unlock(&css->mutex); |
495a5b45a
|
742 743 744 745 |
return ret < 0 ? ret : count; } static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); |
4d284cac7
|
746 |
static int __init setup_css(int nr) |
a28c69448
|
747 748 |
{ u32 tod_high; |
d7b5a4c94
|
749 |
int ret; |
7c9f4e3aa
|
750 |
struct channel_subsystem *css; |
a28c69448
|
751 |
|
7c9f4e3aa
|
752 753 754 755 756 |
css = channel_subsystems[nr]; memset(css, 0, sizeof(struct channel_subsystem)); css->pseudo_subchannel = kzalloc(sizeof(*css->pseudo_subchannel), GFP_KERNEL); if (!css->pseudo_subchannel) |
d7b5a4c94
|
757 |
return -ENOMEM; |
7c9f4e3aa
|
758 759 |
css->pseudo_subchannel->dev.parent = &css->device; css->pseudo_subchannel->dev.release = css_subchannel_release; |
1bf5b2853
|
760 |
dev_set_name(&css->pseudo_subchannel->dev, "defunct"); |
5d6e6b6f6
|
761 |
mutex_init(&css->pseudo_subchannel->reg_mutex); |
e5dcf0025
|
762 |
ret = css_sch_create_locks(css->pseudo_subchannel); |
d7b5a4c94
|
763 |
if (ret) { |
7c9f4e3aa
|
764 |
kfree(css->pseudo_subchannel); |
d7b5a4c94
|
765 766 |
return ret; } |
7c9f4e3aa
|
767 768 769 |
mutex_init(&css->mutex); css->valid = 1; css->cssid = nr; |
1bf5b2853
|
770 |
dev_set_name(&css->device, "css%x", nr); |
7c9f4e3aa
|
771 |
css->device.release = channel_subsystem_release; |
1aae0560d
|
772 |
tod_high = (u32) (get_tod_clock() >> 32); |
7c9f4e3aa
|
773 |
css_generate_pgid(css, tod_high); |
d7b5a4c94
|
774 |
return 0; |
1da177e4c
|
775 |
} |
a55360df4
|
776 777 778 779 780 781 782 783 784 785 786 |
static int css_reboot_event(struct notifier_block *this, unsigned long event, void *ptr) { int ret, i; ret = NOTIFY_DONE; for (i = 0; i <= __MAX_CSSID; i++) { struct channel_subsystem *css; css = channel_subsystems[i]; |
8284fb19e
|
787 |
mutex_lock(&css->mutex); |
a55360df4
|
788 789 790 |
if (css->cm_enabled) if (chsc_secm(css, 0)) ret = NOTIFY_BAD; |
8284fb19e
|
791 |
mutex_unlock(&css->mutex); |
a55360df4
|
792 793 794 795 796 797 798 799 |
} return ret; } static struct notifier_block css_reboot_notifier = { .notifier_call = css_reboot_event, }; |
1da177e4c
|
800 |
/* |
dcbd16d51
|
801 802 803 804 805 806 807 808 |
* Since the css devices are neither on a bus nor have a class * nor have a special device type, we cannot stop/restart channel * path measurements via the normal suspend/resume callbacks, but have * to use notifiers. */ static int css_power_event(struct notifier_block *this, unsigned long event, void *ptr) { |
dcbd16d51
|
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 |
int ret, i; switch (event) { case PM_HIBERNATION_PREPARE: case PM_SUSPEND_PREPARE: ret = NOTIFY_DONE; for (i = 0; i <= __MAX_CSSID; i++) { struct channel_subsystem *css; css = channel_subsystems[i]; mutex_lock(&css->mutex); if (!css->cm_enabled) { mutex_unlock(&css->mutex); continue; } |
f0c077a8b
|
824 825 |
ret = __chsc_do_secm(css, 0); ret = notifier_from_errno(ret); |
dcbd16d51
|
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 |
mutex_unlock(&css->mutex); } break; case PM_POST_HIBERNATION: case PM_POST_SUSPEND: ret = NOTIFY_DONE; for (i = 0; i <= __MAX_CSSID; i++) { struct channel_subsystem *css; css = channel_subsystems[i]; mutex_lock(&css->mutex); if (!css->cm_enabled) { mutex_unlock(&css->mutex); continue; } |
f0c077a8b
|
841 842 |
ret = __chsc_do_secm(css, 1); ret = notifier_from_errno(ret); |
dcbd16d51
|
843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 |
mutex_unlock(&css->mutex); } /* search for subchannels, which appeared during hibernation */ css_schedule_reprobe(); break; default: ret = NOTIFY_DONE; } return ret; } static struct notifier_block css_power_notifier = { .notifier_call = css_power_event, }; /* |
1da177e4c
|
859 |
* Now that the driver core is running, we can setup our channel subsystem. |
14556b33f
|
860 |
* The struct subchannel's are created during probing. |
1da177e4c
|
861 |
*/ |
2f17644d1
|
862 |
static int __init css_bus_init(void) |
1da177e4c
|
863 |
{ |
a28c69448
|
864 |
int ret, i; |
1da177e4c
|
865 |
|
34aec07c1
|
866 867 868 |
ret = chsc_init(); if (ret) return ret; |
34196f82b
|
869 |
chsc_determine_css_characteristics(); |
b0a285d31
|
870 871 |
/* Try to enable MSS. */ ret = chsc_enable_facility(CHSC_SDA_OC_MSS); |
818c272bd
|
872 |
if (ret) |
b0a285d31
|
873 |
max_ssid = 0; |
818c272bd
|
874 875 |
else /* Success. */ max_ssid = __MAX_SSID; |
b0a285d31
|
876 |
|
4434a38c3
|
877 878 879 |
ret = slow_subchannel_init(); if (ret) goto out; |
f5daba1d4
|
880 |
ret = crw_register_handler(CRW_RSC_SCH, css_process_crw); |
c11561897
|
881 882 |
if (ret) goto out; |
1da177e4c
|
883 884 |
if ((ret = bus_register(&css_bus_type))) goto out; |
1da177e4c
|
885 |
|
a28c69448
|
886 887 |
/* Setup css structure. */ for (i = 0; i <= __MAX_CSSID; i++) { |
7c9f4e3aa
|
888 889 890 891 |
struct channel_subsystem *css; css = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); if (!css) { |
a28c69448
|
892 |
ret = -ENOMEM; |
fb6958a59
|
893 |
goto out_unregister; |
a28c69448
|
894 |
} |
7c9f4e3aa
|
895 |
channel_subsystems[i] = css; |
d7b5a4c94
|
896 |
ret = setup_css(i); |
a2164b817
|
897 898 899 900 |
if (ret) { kfree(channel_subsystems[i]); goto out_unregister; } |
7c9f4e3aa
|
901 |
ret = device_register(&css->device); |
a2164b817
|
902 903 904 905 |
if (ret) { put_device(&css->device); goto out_unregister; } |
75784c008
|
906 |
if (css_chsc_characteristics.secm) { |
7c9f4e3aa
|
907 |
ret = device_create_file(&css->device, |
7e560814d
|
908 909 910 911 |
&dev_attr_cm_enable); if (ret) goto out_device; } |
7c9f4e3aa
|
912 |
ret = device_register(&css->pseudo_subchannel->dev); |
c63049332
|
913 914 |
if (ret) { put_device(&css->pseudo_subchannel->dev); |
d7b5a4c94
|
915 |
goto out_file; |
c63049332
|
916 |
} |
a28c69448
|
917 |
} |
a55360df4
|
918 919 |
ret = register_reboot_notifier(&css_reboot_notifier); if (ret) |
a2164b817
|
920 |
goto out_unregister; |
dcbd16d51
|
921 922 923 924 925 |
ret = register_pm_notifier(&css_power_notifier); if (ret) { unregister_reboot_notifier(&css_reboot_notifier); goto out_unregister; } |
1da177e4c
|
926 |
css_init_done = 1; |
3a3fc29a6
|
927 |
/* Enable default isc for I/O subchannels. */ |
6ef556ccc
|
928 |
isc_register(IO_SCH_ISC); |
1da177e4c
|
929 |
|
1da177e4c
|
930 |
return 0; |
d7b5a4c94
|
931 |
out_file: |
a2164b817
|
932 933 934 |
if (css_chsc_characteristics.secm) device_remove_file(&channel_subsystems[i]->device, &dev_attr_cm_enable); |
7e560814d
|
935 |
out_device: |
7c9f4e3aa
|
936 |
device_unregister(&channel_subsystems[i]->device); |
fb6958a59
|
937 |
out_unregister: |
a28c69448
|
938 |
while (i > 0) { |
7c9f4e3aa
|
939 |
struct channel_subsystem *css; |
a28c69448
|
940 |
i--; |
7c9f4e3aa
|
941 942 |
css = channel_subsystems[i]; device_unregister(&css->pseudo_subchannel->dev); |
a2164b817
|
943 |
css->pseudo_subchannel = NULL; |
75784c008
|
944 |
if (css_chsc_characteristics.secm) |
7c9f4e3aa
|
945 |
device_remove_file(&css->device, |
495a5b45a
|
946 |
&dev_attr_cm_enable); |
7c9f4e3aa
|
947 |
device_unregister(&css->device); |
a28c69448
|
948 |
} |
1da177e4c
|
949 950 |
bus_unregister(&css_bus_type); out: |
34aec07c1
|
951 |
crw_unregister_handler(CRW_RSC_SCH); |
b827d1c8b
|
952 |
idset_free(slow_subchannel_set); |
34aec07c1
|
953 |
chsc_init_cleanup(); |
e6d5a428e
|
954 955 956 |
pr_alert("The CSS device driver initialization failed with " "errno=%d ", ret); |
1da177e4c
|
957 958 |
return ret; } |
2f17644d1
|
959 960 961 962 963 964 965 966 967 968 969 970 971 972 |
static void __init css_bus_cleanup(void) { struct channel_subsystem *css; int i; for (i = 0; i <= __MAX_CSSID; i++) { css = channel_subsystems[i]; device_unregister(&css->pseudo_subchannel->dev); css->pseudo_subchannel = NULL; if (css_chsc_characteristics.secm) device_remove_file(&css->device, &dev_attr_cm_enable); device_unregister(&css->device); } bus_unregister(&css_bus_type); |
34aec07c1
|
973 |
crw_unregister_handler(CRW_RSC_SCH); |
b827d1c8b
|
974 |
idset_free(slow_subchannel_set); |
34aec07c1
|
975 |
chsc_init_cleanup(); |
2f17644d1
|
976 977 978 979 980 981 982 983 984 985 |
isc_unregister(IO_SCH_ISC); } static int __init channel_subsystem_init(void) { int ret; ret = css_bus_init(); if (ret) return ret; |
be5d3823f
|
986 987 988 989 990 |
cio_work_q = create_singlethread_workqueue("cio"); if (!cio_work_q) { ret = -ENOMEM; goto out_bus; } |
2f17644d1
|
991 992 |
ret = io_subchannel_init(); if (ret) |
be5d3823f
|
993 |
goto out_wq; |
2f17644d1
|
994 995 |
return ret; |
be5d3823f
|
996 997 998 999 1000 |
out_wq: destroy_workqueue(cio_work_q); out_bus: css_bus_cleanup(); return ret; |
2f17644d1
|
1001 1002 |
} subsys_initcall(channel_subsystem_init); |
8ea7f5590
|
1003 1004 1005 1006 1007 |
static int css_settle(struct device_driver *drv, void *unused) { struct css_driver *cssdrv = to_cssdriver(drv); if (cssdrv->settle) |
b4c707214
|
1008 |
return cssdrv->settle(); |
8ea7f5590
|
1009 1010 |
return 0; } |
0d01bb892
|
1011 |
int css_complete_work(void) |
879acca58
|
1012 1013 1014 1015 |
{ int ret; /* Wait for the evaluation of subchannels to finish. */ |
b4c707214
|
1016 1017 1018 1019 |
ret = wait_event_interruptible(css_eval_wq, atomic_read(&css_eval_scheduled) == 0); if (ret) return -EINTR; |
879acca58
|
1020 1021 |
flush_workqueue(cio_work_q); /* Wait for the subchannel type specific initialization to finish */ |
b4c707214
|
1022 |
return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle); |
879acca58
|
1023 |
} |
2f17644d1
|
1024 1025 1026 1027 1028 1029 |
/* * Wait for the initialization of devices to finish, to make sure we are * done with our setup if the search for the root device starts. */ static int __init channel_subsystem_init_sync(void) { |
14556b33f
|
1030 1031 |
/* Register subchannels which are already in use. */ cio_register_early_subchannels(); |
703e5c999
|
1032 1033 |
/* Start initial subchannel evaluation. */ css_schedule_eval_all(); |
879acca58
|
1034 1035 |
css_complete_work(); return 0; |
2f17644d1
|
1036 1037 |
} subsys_initcall_sync(channel_subsystem_init_sync); |
889ee9556
|
1038 1039 |
void channel_subsystem_reinit(void) { |
62da177ac
|
1040 1041 |
struct channel_path *chp; struct chp_id chpid; |
889ee9556
|
1042 |
chsc_enable_facility(CHSC_SDA_OC_MSS); |
62da177ac
|
1043 1044 |
chp_id_for_each(&chpid) { chp = chpid_to_chp(chpid); |
cce0eacc2
|
1045 1046 |
if (chp) chp_update_desc(chp); |
62da177ac
|
1047 |
} |
889ee9556
|
1048 |
} |
879acca58
|
1049 1050 1051 1052 |
#ifdef CONFIG_PROC_FS static ssize_t cio_settle_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { |
b4c707214
|
1053 |
int ret; |
879acca58
|
1054 1055 |
/* Handle pending CRW's. */ crw_wait_for_channel_report(); |
b4c707214
|
1056 1057 1058 |
ret = css_complete_work(); return ret ? ret : count; |
879acca58
|
1059 1060 1061 |
} static const struct file_operations cio_settle_proc_fops = { |
58ea91c05
|
1062 |
.open = nonseekable_open, |
879acca58
|
1063 |
.write = cio_settle_write, |
6038f373a
|
1064 |
.llseek = no_llseek, |
879acca58
|
1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 |
}; static int __init cio_settle_init(void) { struct proc_dir_entry *entry; entry = proc_create("cio_settle", S_IWUSR, NULL, &cio_settle_proc_fops); if (!entry) return -ENOMEM; return 0; } device_initcall(cio_settle_init); #endif /*CONFIG_PROC_FS*/ |
d7b5a4c94
|
1079 1080 1081 1082 |
int sch_is_pseudo_sch(struct subchannel *sch) { return sch == to_css(sch->dev.parent)->pseudo_subchannel; } |
f08adc008
|
1083 |
static int css_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4c
|
1084 |
{ |
084325d80
|
1085 1086 |
struct subchannel *sch = to_subchannel(dev); struct css_driver *driver = to_cssdriver(drv); |
f08adc008
|
1087 |
struct css_device_id *id; |
1da177e4c
|
1088 |
|
f08adc008
|
1089 1090 1091 1092 |
for (id = driver->subchannel_type; id->match_flags; id++) { if (sch->st == id->type) return 1; } |
1da177e4c
|
1093 1094 1095 |
return 0; } |
98c13c283
|
1096 |
static int css_probe(struct device *dev) |
8bbace7e6
|
1097 1098 |
{ struct subchannel *sch; |
98c13c283
|
1099 |
int ret; |
8bbace7e6
|
1100 1101 |
sch = to_subchannel(dev); |
084325d80
|
1102 |
sch->driver = to_cssdriver(dev->driver); |
98c13c283
|
1103 1104 1105 1106 |
ret = sch->driver->probe ? sch->driver->probe(sch) : 0; if (ret) sch->driver = NULL; return ret; |
8bbace7e6
|
1107 |
} |
98c13c283
|
1108 |
static int css_remove(struct device *dev) |
8bbace7e6
|
1109 1110 |
{ struct subchannel *sch; |
98c13c283
|
1111 |
int ret; |
8bbace7e6
|
1112 1113 |
sch = to_subchannel(dev); |
98c13c283
|
1114 1115 1116 |
ret = sch->driver->remove ? sch->driver->remove(sch) : 0; sch->driver = NULL; return ret; |
8bbace7e6
|
1117 |
} |
98c13c283
|
1118 |
static void css_shutdown(struct device *dev) |
8bbace7e6
|
1119 1120 1121 1122 |
{ struct subchannel *sch; sch = to_subchannel(dev); |
98c13c283
|
1123 |
if (sch->driver && sch->driver->shutdown) |
8bbace7e6
|
1124 1125 |
sch->driver->shutdown(sch); } |
7e9db9eae
|
1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 |
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; } |
dcbd16d51
|
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 |
static int css_pm_prepare(struct device *dev) { struct subchannel *sch = to_subchannel(dev); struct css_driver *drv; if (mutex_is_locked(&sch->reg_mutex)) return -EAGAIN; if (!sch->dev.driver) return 0; drv = to_cssdriver(sch->dev.driver); /* Notify drivers that they may not register children. */ return drv->prepare ? drv->prepare(sch) : 0; } static void css_pm_complete(struct device *dev) { struct subchannel *sch = to_subchannel(dev); struct css_driver *drv; if (!sch->dev.driver) return; drv = to_cssdriver(sch->dev.driver); if (drv->complete) drv->complete(sch); } static int css_pm_freeze(struct device *dev) { struct subchannel *sch = to_subchannel(dev); struct css_driver *drv; if (!sch->dev.driver) return 0; drv = to_cssdriver(sch->dev.driver); return drv->freeze ? drv->freeze(sch) : 0; } static int css_pm_thaw(struct device *dev) { struct subchannel *sch = to_subchannel(dev); struct css_driver *drv; if (!sch->dev.driver) return 0; drv = to_cssdriver(sch->dev.driver); return drv->thaw ? drv->thaw(sch) : 0; } static int css_pm_restore(struct device *dev) { struct subchannel *sch = to_subchannel(dev); struct css_driver *drv; |
eb4f5d93d
|
1189 |
css_update_ssd_info(sch); |
dcbd16d51
|
1190 1191 1192 1193 1194 |
if (!sch->dev.driver) return 0; drv = to_cssdriver(sch->dev.driver); return drv->restore ? drv->restore(sch) : 0; } |
471452104
|
1195 |
static const struct dev_pm_ops css_pm_ops = { |
dcbd16d51
|
1196 1197 1198 1199 1200 1201 |
.prepare = css_pm_prepare, .complete = css_pm_complete, .freeze = css_pm_freeze, .thaw = css_pm_thaw, .restore = css_pm_restore, }; |
3041b6ab5
|
1202 |
static struct bus_type css_bus_type = { |
8bbace7e6
|
1203 1204 1205 1206 1207 |
.name = "css", .match = css_bus_match, .probe = css_probe, .remove = css_remove, .shutdown = css_shutdown, |
7e9db9eae
|
1208 |
.uevent = css_uevent, |
dcbd16d51
|
1209 |
.pm = &css_pm_ops, |
1da177e4c
|
1210 |
}; |
25b7bb583
|
1211 1212 1213 1214 1215 1216 1217 1218 1219 |
/** * css_driver_register - register a css driver * @cdrv: css driver to register * * This is mainly a wrapper around driver_register that sets name * and bus_type in the embedded struct device_driver correctly. */ int css_driver_register(struct css_driver *cdrv) { |
25b7bb583
|
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 |
cdrv->drv.bus = &css_bus_type; return driver_register(&cdrv->drv); } EXPORT_SYMBOL_GPL(css_driver_register); /** * css_driver_unregister - unregister a css driver * @cdrv: css driver to unregister * * This is a wrapper around driver_unregister. */ void css_driver_unregister(struct css_driver *cdrv) { driver_unregister(&cdrv->drv); } EXPORT_SYMBOL_GPL(css_driver_unregister); |
1da177e4c
|
1236 |
MODULE_LICENSE("GPL"); |