diff options
| -rw-r--r-- | drivers/s390/cio/chp.c | 20 | ||||
| -rw-r--r-- | drivers/s390/cio/chp.h | 13 | ||||
| -rw-r--r-- | drivers/s390/cio/chsc.c | 218 | ||||
| -rw-r--r-- | drivers/s390/cio/cio.c | 1 | ||||
| -rw-r--r-- | drivers/s390/cio/css.c | 123 | ||||
| -rw-r--r-- | drivers/s390/cio/css.h | 38 | ||||
| -rw-r--r-- | drivers/s390/cio/device.c | 365 | ||||
| -rw-r--r-- | drivers/s390/cio/device.h | 7 | ||||
| -rw-r--r-- | drivers/s390/cio/device_fsm.c | 106 |
9 files changed, 381 insertions, 510 deletions
diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c index 297cdceb0ca..297f1653b52 100644 --- a/drivers/s390/cio/chp.c +++ b/drivers/s390/cio/chp.c @@ -496,6 +496,26 @@ void chp_process_crw(int id, int status) chsc_chp_offline(chpid); } +int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct res_acc_data *data) +{ + int i; + int mask; + + for (i = 0; i < 8; i++) { + mask = 0x80 >> i; + if (!(ssd->path_mask & mask)) + continue; + if (!chp_id_is_equal(&ssd->chpid[i], &data->chpid)) + continue; + if ((ssd->fla_valid_mask & mask) && + ((ssd->fla[i] & data->fla_mask) != data->fla)) + continue; + return mask; + } + return 0; +} +EXPORT_SYMBOL_GPL(chp_ssd_get_mask); + static inline int info_bit_num(struct chp_id id) { return id.id + id.cssid * (__MAX_CHPID + 1); diff --git a/drivers/s390/cio/chp.h b/drivers/s390/cio/chp.h index 59c2fc069d9..f03b0d2cdc0 100644 --- a/drivers/s390/cio/chp.h +++ b/drivers/s390/cio/chp.h @@ -19,6 +19,17 @@ #define CHP_STATUS_RESERVED 2 #define CHP_STATUS_NOT_RECOGNIZED 3 +#define CHP_ONLINE 0 +#define CHP_OFFLINE 1 +#define CHP_VARY_ON 2 +#define CHP_VARY_OFF 3 + +struct res_acc_data { + struct chp_id chpid; + u32 fla_mask; + u16 fla; +}; + static inline int chp_test_bit(u8 *bitmap, int num) { int byte = num >> 3; @@ -50,5 +61,5 @@ int chp_new(struct chp_id chpid); void chp_cfg_schedule(struct chp_id chpid, int configure); void chp_cfg_cancel_deconfigure(struct chp_id chpid); int chp_info_get_status(struct chp_id chpid); - +int chp_ssd_get_mask(struct chsc_ssd_info *, struct res_acc_data *); #endif /* S390_CHP_H */ diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c index 5de86908b0d..1c0f5db94c7 100644 --- a/drivers/s390/cio/chsc.c +++ b/drivers/s390/cio/chsc.c @@ -2,8 +2,7 @@ * drivers/s390/cio/chsc.c * S/390 common I/O routines -- channel subsystem call * - * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, - * IBM Corporation + * 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) @@ -127,77 +126,12 @@ out_free: return ret; } -static int check_for_io_on_path(struct subchannel *sch, int mask) -{ - int cc; - - cc = stsch(sch->schid, &sch->schib); - if (cc) - return 0; - if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == mask) - return 1; - return 0; -} - -static void terminate_internal_io(struct subchannel *sch) -{ - if (cio_clear(sch)) { - /* Recheck device in case clear failed. */ - sch->lpm = 0; - if (device_trigger_verify(sch) != 0) - css_schedule_eval(sch->schid); - return; - } - /* Request retry of internal operation. */ - device_set_intretry(sch); - /* Call handler. */ - if (sch->driver && sch->driver->termination) - sch->driver->termination(sch); -} - static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data) { - int j; - int mask; - struct chp_id *chpid = data; - struct schib schib; - - for (j = 0; j < 8; j++) { - mask = 0x80 >> j; - if ((sch->schib.pmcw.pim & mask) && - (sch->schib.pmcw.chpid[j] == chpid->id)) - break; - } - if (j >= 8) - return 0; - spin_lock_irq(sch->lock); - - stsch(sch->schid, &schib); - if (!css_sch_is_valid(&schib)) - goto out_unreg; - memcpy(&sch->schib, &schib, sizeof(struct schib)); - /* Check for single path devices. */ - if (sch->schib.pmcw.pim == 0x80) - goto out_unreg; - - if (check_for_io_on_path(sch, mask)) { - if (device_is_online(sch)) - device_kill_io(sch); - else { - terminate_internal_io(sch); - /* Re-start path verification. */ - if (sch->driver && sch->driver->verify) - sch->driver->verify(sch); - } - } else { - /* trigger path verification. */ - if (sch->driver && sch->driver->verify) - sch->driver->verify(sch); - else if (sch->lpm == mask) + if (sch->driver && sch->driver->chp_event) + if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0) goto out_unreg; - } - spin_unlock_irq(sch->lock); return 0; @@ -242,53 +176,11 @@ static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data) return 0; } -struct res_acc_data { - struct chp_id chpid; - u32 fla_mask; - u16 fla; -}; - -static int get_res_chpid_mask(struct chsc_ssd_info *ssd, - struct res_acc_data *data) -{ - int i; - int mask; - - for (i = 0; i < 8; i++) { - mask = 0x80 >> i; - if (!(ssd->path_mask & mask)) - continue; - if (!chp_id_is_equal(&ssd->chpid[i], &data->chpid)) - continue; - if ((ssd->fla_valid_mask & mask) && - ((ssd->fla[i] & data->fla_mask) != data->fla)) - continue; - return mask; - } - return 0; -} - static int __s390_process_res_acc(struct subchannel *sch, void *data) { - int chp_mask, old_lpm; - struct res_acc_data *res_data = data; - spin_lock_irq(sch->lock); - chp_mask = get_res_chpid_mask(&sch->ssd_info, res_data); - if (chp_mask == 0) - goto out; - if (stsch(sch->schid, &sch->schib)) - goto out; - old_lpm = sch->lpm; - sch->lpm = ((sch->schib.pmcw.pim & - sch->schib.pmcw.pam & - sch->schib.pmcw.pom) - | chp_mask) & sch->opm; - if (!old_lpm && sch->lpm) - device_trigger_reprobe(sch); - else if (sch->driver && sch->driver->verify) - sch->driver->verify(sch); -out: + if (sch->driver && sch->driver->chp_event) + sch->driver->chp_event(sch, data, CHP_ONLINE); spin_unlock_irq(sch->lock); return 0; @@ -509,114 +401,36 @@ void chsc_process_crw(void) } while (sei_area->flags & 0x80); } -static int __chp_add_new_sch(struct subchannel_id schid, void *data) -{ - struct schib schib; - - if (stsch_err(schid, &schib)) - /* We're through */ - return -ENXIO; - - /* Put it on the slow path. */ - css_schedule_eval(schid); - return 0; -} - - -static int __chp_add(struct subchannel *sch, void *data) -{ - int i, mask; - struct chp_id *chpid = data; - - spin_lock_irq(sch->lock); - for (i=0; i<8; i++) { - mask = 0x80 >> i; - if ((sch->schib.pmcw.pim & mask) && - (sch->schib.pmcw.chpid[i] == chpid->id)) - break; - } - if (i==8) { - spin_unlock_irq(sch->lock); - return 0; - } - if (stsch(sch->schid, &sch->schib)) { - spin_unlock_irq(sch->lock); - css_schedule_eval(sch->schid); - return 0; - } - sch->lpm = ((sch->schib.pmcw.pim & - sch->schib.pmcw.pam & - sch->schib.pmcw.pom) - | mask) & sch->opm; - - if (sch->driver && sch->driver->verify) - sch->driver->verify(sch); - - spin_unlock_irq(sch->lock); - - return 0; -} - void chsc_chp_online(struct chp_id chpid) { char dbf_txt[15]; + struct res_acc_data res_data; sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id); CIO_TRACE_EVENT(2, dbf_txt); if (chp_get_status(chpid) != 0) { + memset(&res_data, 0, sizeof(struct res_acc_data)); + res_data.chpid = chpid; /* Wait until previous actions have settled. */ css_wait_for_slow_path(); - for_each_subchannel_staged(__chp_add, __chp_add_new_sch, - &chpid); + for_each_subchannel_staged(__s390_process_res_acc, NULL, + &res_data); } } static void __s390_subchannel_vary_chpid(struct subchannel *sch, struct chp_id chpid, int on) { - int chp, old_lpm; - int mask; unsigned long flags; + struct res_acc_data res_data; + memset(&res_data, 0, sizeof(struct res_acc_data)); + res_data.chpid = chpid; spin_lock_irqsave(sch->lock, flags); - old_lpm = sch->lpm; - for (chp = 0; chp < 8; chp++) { - mask = 0x80 >> chp; - if (!(sch->ssd_info.path_mask & mask)) - continue; - if (!chp_id_is_equal(&sch->ssd_info.chpid[chp], &chpid)) - continue; - - if (on) { - sch->opm |= mask; - sch->lpm |= mask; - if (!old_lpm) - device_trigger_reprobe(sch); - else if (sch->driver && sch->driver->verify) - sch->driver->verify(sch); - break; - } - sch->opm &= ~mask; - sch->lpm &= ~mask; - if (check_for_io_on_path(sch, mask)) { - if (device_is_online(sch)) - /* Path verification is done after killing. */ - device_kill_io(sch); - else { - /* Kill and retry internal I/O. */ - terminate_internal_io(sch); - /* Re-start path verification. */ - if (sch->driver && sch->driver->verify) - sch->driver->verify(sch); - } - } else if (!sch->lpm) { - if (device_trigger_verify(sch) != 0) - css_schedule_eval(sch->schid); - } else if (sch->driver && sch->driver->verify) - sch->driver->verify(sch); - break; - } + if (sch->driver && sch->driver->chp_event) + sch->driver->chp_event(sch, &res_data, + on ? CHP_VARY_ON : CHP_VARY_OFF); spin_unlock_irqrestore(sch->lock, flags); } diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index 903e23ae8ed..fdb164f3610 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -564,6 +564,7 @@ int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) } /* Copy subchannel type from path management control word. */ sch->st = sch->schib.pmcw.st; + switch (sch->st) { case SUBCHANNEL_TYPE_IO: err = cio_validate_io_subchannel(sch); diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index 53e7496dc90..020566571e0 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -283,7 +283,7 @@ static int css_register_subchannel(struct subchannel *sch) return ret; } -static int css_probe_device(struct subchannel_id schid) +int css_probe_device(struct subchannel_id schid) { int ret; struct subchannel *sch; @@ -330,112 +330,6 @@ int css_sch_is_valid(struct schib *schib) } 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; @@ -454,6 +348,21 @@ 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; diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h index e0fc7b49978..4cdc132c86b 100644 --- a/drivers/s390/cio/css.h +++ b/drivers/s390/cio/css.h @@ -58,18 +58,27 @@ struct pgid { __u32 tod_high; /* high word TOD clock */ } __attribute__ ((packed)); -/* - * A css driver handles all subchannels of one type. - */ struct subchannel; +/** + * struct css_driver - device driver for subchannels + * @owner: owning module + * @subchannel_type: subchannel type supported by this driver + * @drv: embedded device driver structure + * @irq: called on interrupts + * @chp_event: called for events affecting a channel path + * @sch_event: called for events affecting the subchannel + * @probe: function called on probe + * @remove: function called on remove + * @shutdown: called at device shutdown + * @name: name of the device driver + */ struct css_driver { struct module *owner; unsigned int subchannel_type; struct device_driver drv; void (*irq)(struct subchannel *); - int (*notify)(struct subchannel *, int); - void (*verify)(struct subchannel *); - void (*termination)(struct subchannel *); + int (*chp_event)(struct subchannel *, void *, int); + int (*sch_event)(struct subchannel *, int); int (*probe)(struct subchannel *); int (*remove)(struct subchannel *); void (*shutdown)(struct subchannel *); @@ -87,7 +96,8 @@ extern int css_driver_register(struct css_driver *); extern void css_driver_unregister(struct css_driver *); extern void css_sch_device_unregister(struct subchannel *); -extern struct subchannel * get_subchannel_by_schid(struct subchannel_id); +extern int css_probe_device(struct subchannel_id); +extern struct subchannel *get_subchannel_by_schid(struct subchannel_id); extern int css_init_done; int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), int (*fn_unknown)(struct subchannel_id, @@ -119,20 +129,6 @@ struct channel_subsystem { extern struct bus_type css_bus_type; extern struct channel_subsystem *channel_subsystems[]; -/* Some helper functions for disconnected state. */ -int device_is_disconnected(struct subchannel *); -void device_set_disconnected(struct subchannel *); -void device_trigger_reprobe(struct subchannel *); - -/* Helper functions for vary on/off. */ -int device_is_online(struct subchannel *); -void device_kill_io(struct subchannel *); -void device_set_intretry(struct subchannel *sch); -int device_trigger_verify(struct subchannel *sch); - -/* Machine check helper function. */ -void device_kill_pending_timer(struct subchannel *); - /* Helper functions to build lists for the slow path. */ void css_schedule_eval(struct subchannel_id schid); void css_schedule_eval_all(void); diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c index 23b129fd4d8..9281b25087a 100644 --- a/drivers/s390/cio/device.c +++ b/drivers/s390/cio/device.c @@ -2,8 +2,7 @@ * drivers/s390/cio/device.c * bus driver for ccw devices * - * 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) * Martin Schwidefsky (schwidefsky@de.ibm.com) @@ -126,19 +125,17 @@ struct bus_type ccw_bus_type; static void io_subchannel_irq(struct subchannel *); static int io_subchannel_probe(struct subchannel *); static int io_subchannel_remove(struct subchannel *); -static int io_subchannel_notify(struct subchannel *, int); -static void io_subchannel_verify(struct subchannel *); -static void io_subchannel_ioterm(struct subchannel *); static void io_subchannel_shutdown(struct subchannel *); +static int io_subchannel_sch_event(struct subchannel *, int); +static int io_subchannel_chp_event(struct subchannel *, void *, int); static struct css_driver io_subchannel_driver = { .owner = THIS_MODULE, .subchannel_type = SUBCHANNEL_TYPE_IO, .name = "io_subchannel", .irq = io_subchannel_irq, - .notify = io_subchannel_notify, - .verify = io_subchannel_verify, - .termination = io_subchannel_ioterm, + .sch_event = io_subchannel_sch_event, + .chp_event = io_subchannel_chp_event, .probe = io_subchannel_probe, .remove = io_subchannel_remove, .shutdown = io_subchannel_shutdown, @@ -786,7 +783,7 @@ static void sch_attach_device(struct subchannel *sch, sch_set_cdev(sch, cdev); cdev->private->schid = sch->schid; cdev->ccwlock = sch->lock; - device_trigger_reprobe(sch); + ccw_device_trigger_reprobe(cdev); spin_unlock_irq(sch->lock); } @@ -1265,11 +1262,7 @@ static int io_subchannel_notify(struct subchannel *sch, int event) cdev = sch_get_cdev(sch); if (!cdev) return 0; - if (!cdev->drv) - return 0; - if (!cdev->online) - return 0; - return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; + return ccw_device_notify(cdev, event); } static void io_subchannel_verify(struct subchannel *sch) @@ -1281,22 +1274,98 @@ static void io_subchannel_verify(struct subchannel *sch) dev_fsm_event(cdev, DEV_EVENT_VERIFY); } -static void io_subchannel_ioterm(struct subchannel *sch) +static int check_for_io_on_path(struct subchannel *sch, int mask) { - struct ccw_device *cdev; + int cc; - cdev = sch_get_cdev(sch); - if (!cdev) - return; - /* Internal I/O will be retried by the interrupt handler. */ - if (cdev->private->flags.intretry) + cc = stsch(sch->schid, &sch->schib); + if (cc) + return 0; + if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == mask) + return 1; + return 0; +} + +static void terminate_internal_io(struct subchannel *sch, + struct ccw_device *cdev) +{ + if (cio_clear(sch)) { + /* Recheck device in case clear failed. */ + sch->lpm = 0; + if (cdev->online) + dev_fsm_event(cdev, DEV_EVENT_VERIFY); + else + css_schedule_eval(sch->schid); return; + } cdev->private->state = DEV_STATE_CLEAR_VERIFY; + /* Request retry of internal operation. */ + cdev->private->flags.intretry = 1; + /* Call handler. */ if (cdev->handler) cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); } +static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) +{ + struct ccw_device *cdev; + + cdev = sch_get_cdev(sch); + if (!cdev) + return; + if (check_for_io_on_path(sch, mask)) { + if (cdev->private->state == DEV_STATE_ONLINE) + ccw_device_kill_io(cdev); + else { + terminate_internal_io(sch, cdev); + /* Re-start path verification. */ + dev_fsm_event(cdev, DEV_EVENT_VERIFY); + } + } else + /* trigger path verification. */ + dev_fsm_event(cdev, DEV_EVENT_VERIFY); + +} + +static int io_subchannel_chp_event(struct subchannel *sch, void *data, + int event) +{ + int mask; + struct res_acc_data *res_data; + + res_data = data; + mask = chp_ssd_get_mask(&sch->ssd_info, res_data); + if (!mask) + return 0; + switch (event) { + case CHP_VARY_OFF: + sch->opm &= ~mask; + sch->lpm &= ~mask; + io_subchannel_terminate_path(sch, mask); + break; + case CHP_VARY_ON: + sch->opm |= mask; + sch->lpm |= mask; + io_subchannel_verify(sch); + break; + case CHP_OFFLINE: + if (stsch(sch->schid, &sch->schib)) + return -ENXIO; + if (!css_sch_is_valid(&sch->schib)) + return -ENODEV; + io_subchannel_terminate_path(sch, mask); + break; + case CHP_ONLINE: + if (stsch(sch->schid, &sch->schib)) + return -ENXIO; + sch->lpm |= mask & sch->opm; + io_subchannel_verify(sch); + break; + } + return 0; +} + static void io_subchannel_shutdown(struct subchannel *sch) { @@ -1326,6 +1395,195 @@ io_subchannel_shutdown(struct subchannel *sch) cio_disable_subchannel(sch); } +static int io_subchannel_get_status(struct subchannel *sch) +{ + struct schib schib; + + if (stsch(sch->schid, &schib) || !schib.pmcw.dnv) + 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 device_is_disconnected(struct ccw_device *cdev) +{ + if (!cdev) + return 0; + return (cdev->private->state == DEV_STATE_DISCONNECTED || + cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); +} + +static int recovery_check(struct device *dev, void *data) +{ + struct ccw_device *cdev = to_ccwdev(dev); + int *redo = data; + + spin_lock_irq(cdev->ccwlock); + switch (cdev->private->state) { + case DEV_STATE_DISCONNECTED: + CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", + cdev->private->dev_id.ssid, + cdev->private->dev_id.devno); + dev_fsm_event(cdev, DEV_EVENT_VERIFY); + *redo = 1; + break; + case DEV_STATE_DISCONNECTED_SENSE_ID: + *redo = 1; + break; + } + spin_unlock_irq(cdev->ccwlock); + + return 0; +} + +static void recovery_work_func(struct work_struct *unused) +{ + int redo = 0; + + bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); + if (redo) { + spin_lock_irq(&recovery_lock); + if (!timer_pending(&recovery_timer)) { + if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) + recovery_phase++; + mod_timer(&recovery_timer, jiffies + + recovery_delay[recovery_phase] * HZ); + } + spin_unlock_irq(&recovery_lock); + } else + CIO_MSG_EVENT(4, "recovery: end\n"); +} + +static DECLARE_WORK(recovery_work, recovery_work_func); + +static void recovery_func(unsigned long data) +{ + /* + * We can't do our recovery in softirq context and it's not + * performance critical, so we schedule it. + */ + schedule_work(&recovery_work); +} + +static void ccw_device_schedule_recovery(void) +{ + unsigned long flags; + + CIO_MSG_EVENT(4, "recovery: schedule\n"); + spin_lock_irqsave(&recovery_lock, flags); + if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { + recovery_phase = 0; + mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); + } + spin_unlock_irqrestore(&recovery_lock, flags); +} + +static void device_set_disconnected(struct ccw_device *cdev) +{ + if (!cdev) + return; + ccw_device_set_timeout(cdev, 0); + cdev->private->flags.fake_irb = 0; + cdev->private->state = DEV_STATE_DISCONNECTED; + if (cdev->online) + ccw_device_schedule_recovery(); +} + +static int io_subchannel_sch_event(struct subchannel *sch, int slow) +{ + int event, ret, disc; + unsigned long flags; + enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE } action; + struct ccw_device *cdev; + + spin_lock_irqsave(sch->lock, flags); + cdev = sch_get_cdev(sch); + disc = device_is_disconnected(cdev); + 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. */ + if (cdev) + ccw_device_set_timeout(cdev, 0); + if (!disc && !slow) { + /* Non-disconnected devices are evaluated on the slow path. */ + spin_unlock_irqrestore(sch->lock, flags); + return -EAGAIN; + } + event = io_subchannel_get_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(cdev); + /* Ask driver what to do with device. */ + action = UNREGISTER; + spin_unlock_irqrestore(sch->lock, flags); + ret = io_subchannel_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: + ccw_device_trigger_reprobe(cdev); + break; + default: + break; + } + spin_unlock_irqrestore(sch->lock, flags); + /* Probe if necessary. */ + if (action == UNREGISTER_PROBE) + ret = css_probe_device(sch->schid); + + return ret; +} + #ifdef CONFIG_CCW_CONSOLE static struct ccw_device console_cdev; static struct ccw_device_private console_private; @@ -1558,71 +1816,6 @@ ccw_device_get_subchannel_id(struct ccw_device *cdev) return sch->schid; } -static int recovery_check(struct device *dev, void *data) -{ - struct ccw_device *cdev = to_ccwdev(dev); - int *redo = data; - - spin_lock_irq(cdev->ccwlock); - switch (cdev->private->state) { - case DEV_STATE_DISCONNECTED: - CIO_MSG_EVENT(4, "recovery: trigger 0.%x.%04x\n", - cdev->private->dev_id.ssid, - cdev->private->dev_id.devno); - dev_fsm_event(cdev, DEV_EVENT_VERIFY); - *redo = 1; - break; - case DEV_STATE_DISCONNECTED_SENSE_ID: - *redo = 1; - break; - } - spin_unlock_irq(cdev->ccwlock); - - return 0; -} - -static void recovery_work_func(struct work_struct *unused) -{ - int redo = 0; - - bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); - if (redo) { - spin_lock_irq(&recovery_lock); - if (!timer_pending(&recovery_timer)) { - if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) - recovery_phase++; - mod_timer(&recovery_timer, jiffies + - recovery_delay[recovery_phase] * HZ); - } - spin_unlock_irq(&recovery_lock); - } else - CIO_MSG_EVENT(4, "recovery: end\n"); -} - -static DECLARE_WORK(recovery_work, recovery_work_func); - -static void recovery_func(unsigned long data) -{ - /* - * We can't do our recovery in softirq context and it's not - * performance critical, so we schedule it. - */ - schedule_work(&recovery_work); -} - -void ccw_device_schedule_recovery(void) -{ - unsigned long flags; - - CIO_MSG_EVENT(4, "recovery: schedule\n"); - spin_lock_irqsave(&recovery_lock, flags); - if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { - recovery_phase = 0; - mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); - } - spin_unlock_irqrestore(&recovery_lock, flags); -} - MODULE_LICENSE("GPL"); EXPORT_SYMBOL(ccw_device_set_online); EXPORT_SYMBOL(ccw_device_set_offline); diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h index cb08092be39..9800a8335a3 100644 --- a/drivers/s390/cio/device.h +++ b/drivers/s390/cio/device.h @@ -88,8 +88,6 @@ int ccw_device_recognition(struct ccw_device *); int ccw_device_online(struct ccw_device *); int ccw_device_offline(struct ccw_device *); -void ccw_device_schedule_recovery(void); - /* Function prototypes for device status and basic sense stuff. */ void ccw_device_accumulate_irb(struct ccw_device *, struct irb *); void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *); @@ -118,6 +116,11 @@ int ccw_device_call_handler(struct ccw_device *); int ccw_device_stlck(struct ccw_device *); +/* Helper function for machine check handling. */ +void ccw_device_trigger_reprobe(struct ccw_device *); +void ccw_device_kill_io(struct ccw_device *); +int ccw_device_notify(struct ccw_device *, int); + /* qdio needs this. */ void ccw_device_set_timeout(struct ccw_device *, int); extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *); diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c index e268d5a77c1..c9b97cbc220 100644 --- a/drivers/s390/cio/device_fsm.c +++ b/drivers/s390/cio/device_fsm.c @@ -2,8 +2,7 @@ * drivers/s390/cio/device_fsm.c * finite state machine for device handling * - * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, - * IBM Corporation + * Copyright IBM Corp. 2002,2008 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) * Martin Schwidefsky (schwidefsky@de.ibm.com) */ @@ -27,65 +26,6 @@ static int timeout_log_enabled; -int -device_is_online(struct subchannel *sch) -{ - struct ccw_device *cdev; - - cdev = sch_get_cdev(sch); - if (!cdev) - return 0; - return (cdev->private->state == DEV_STATE_ONLINE); -} - -int -device_is_disconnected(struct subchannel *sch) -{ - struct ccw_device *cdev; - - cdev = sch_get_cdev(sch); - if (!cdev) - return 0; - return (cdev->private->state == DEV_STATE_DISCONNECTED || - cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); -} - -void -device_set_disconnected(struct subchannel *sch) -{ - struct ccw_device *cdev; - - cdev = sch_get_cdev(sch); - if (!cdev) - return; - ccw_device_set_timeout(cdev, 0); - cdev->private->flags.fake_irb = 0; - cdev->private->state = DEV_STATE_DISCONNECTED; - if (cdev->online) - ccw_device_schedule_recovery(); -} - -void device_set_intretry(struct subchannel *sch) -{ - struct ccw_device *cdev; - - cdev = sch_get_cdev(sch); - if (!cdev) - return; - cdev->private->flags.intretry = 1; -} - -int device_trigger_verify(struct subchannel *sch) -{ - struct ccw_device *cdev; - - cdev = sch_get_cdev(sch); - if (!cdev || !cdev->online) - return -EINVAL; - dev_fsm_event(cdev, DEV_EVENT_VERIFY); - return 0; -} - static int __init ccw_timeout_log_setup(char *unused) { timeout_log_enabled = 1; @@ -171,18 +111,6 @@ ccw_device_set_timeout(struct ccw_device *cdev, int expires) add_timer(&cdev->private->timer); } -/* Kill any pending timers after machine check. */ -void -device_kill_pending_timer(struct subchannel *sch) -{ - struct ccw_device *cdev; - - cdev = sch_get_cdev(sch); - if (!cdev) - return; - ccw_device_set_timeout(cdev, 0); -} - /* * Cancel running i/o. This is called repeatedly since halt/clear are * asynchronous operations. We do one try with cio_cancel, two tries @@ -388,25 +316,27 @@ ccw_device_sense_id_done(struct ccw_device *cdev, int err) } } +int ccw_device_notify(struct ccw_device *cdev, int event) +{ + if (!cdev->drv) + return 0; + if (!cdev->online) + return 0; + return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; +} + static void ccw_device_oper_notify(struct work_struct *work) { struct ccw_device_private *priv; struct ccw_device *cdev; - struct subchannel *sch; int ret; unsigned long flags; priv = container_of(work, struct ccw_device_private, kick_work); cdev = priv->cdev; + ret = ccw_device_notify(cdev, CIO_OPER); spin_lock_irqsave(cdev->ccwlock, flags); - sch = to_subchannel(cdev->dev.parent); - if (sch->driver && sch->driver->notify) { - spin_unlock_irqrestore(cdev->ccwlock, flags); - ret = sch->driver->notify(sch, CIO_OPER); - spin_lock_irqsave(cdev->ccwlock, flags); - } else - ret = 0; if (ret) { /* Reenable channel measurements, if needed. */ spin_unlock_irqrestore(cdev->ccwlock, flags); @@ -986,12 +916,10 @@ ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) ERR_PTR(-EIO)); } -void device_kill_io(struct subchannel *sch) +void ccw_device_kill_io(struct ccw_device *cdev) { int ret; - struct ccw_device *cdev; - cdev = sch_get_cdev(sch); ret = ccw_device_cancel_halt_clear(cdev); if (ret == -EBUSY) { ccw_device_set_timeout(cdev, 3*HZ); @@ -1055,17 +983,14 @@ ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) ccw_device_sense_id_start(cdev); } -void -device_trigger_reprobe(struct subchannel *sch) +void ccw_device_trigger_reprobe(struct ccw_device *cdev) { - struct ccw_device *cdev; + struct subchannel *sch; - cdev = sch_get_cdev(sch); - if (!cdev) - return; if (cdev->private->state != DEV_STATE_DISCONNECTED) return; + sch = to_subchannel(cdev->dev.parent); /* Update some values. */ if (stsch(sch->schid, &sch->schib)) return; @@ -1081,7 +1006,6 @@ device_trigger_reprobe(struct subchannel *sch) sch->schib.pmcw.ena = 0; if ((sch->lpm & (sch->lpm - 1)) != 0) sch->schib.pmcw.mp = 1; - sch->schib.pmcw.intparm = (u32)(addr_t)sch; /* We should also udate ssd info, but this has to wait. */ /* Check if this is another device which appeared on the same sch. */ if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { |