X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fs390%2Fblock%2Fdasd.c;fp=drivers%2Fs390%2Fblock%2Fdasd.c;h=25c1ef6dfd44e796fa9f92e56a36c3d917793831;hb=16c70f8c1b54b61c3b951b6fb220df250fe09b32;hp=cfb1fff3787caafd63fe05a2c36587bfdb8f19a5;hpb=4e76c8a9fa413ccc09d3f7f664183dcce3555d57;p=linux-2.6.git diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index cfb1fff37..25c1ef6df 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -9,7 +9,6 @@ * */ -#include #include #include #include @@ -53,7 +52,7 @@ static void dasd_setup_queue(struct dasd_device * device); static void dasd_free_queue(struct dasd_device * device); static void dasd_flush_request_queue(struct dasd_device *); static void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); -static void dasd_flush_ccw_queue(struct dasd_device *, int); +static int dasd_flush_ccw_queue(struct dasd_device *, int); static void dasd_tasklet(struct dasd_device *); static void do_kick_device(void *data); @@ -61,6 +60,7 @@ static void do_kick_device(void *data); * SECTION: Operations on the device structure. */ static wait_queue_head_t dasd_init_waitq; +static wait_queue_head_t dasd_flush_wq; /* * Allocate memory for a new device structure. @@ -95,7 +95,7 @@ dasd_alloc_device(void) spin_lock_init(&device->mem_lock); spin_lock_init(&device->request_queue_lock); atomic_set (&device->tasklet_scheduled, 0); - tasklet_init(&device->tasklet, + tasklet_init(&device->tasklet, (void (*)(unsigned long)) dasd_tasklet, (unsigned long) device); INIT_LIST_HEAD(&device->ccw_queue); @@ -122,13 +122,13 @@ dasd_free_device(struct dasd_device *device) /* * Make a new device known to the system. */ -static inline int +static int dasd_state_new_to_known(struct dasd_device *device) { int rc; /* - * As long as the device is not in state DASD_STATE_NEW we want to + * As long as the device is not in state DASD_STATE_NEW we want to * keep the reference count > 0. */ dasd_get_device(device); @@ -146,7 +146,7 @@ dasd_state_new_to_known(struct dasd_device *device) /* * Let the system forget about a device. */ -static inline void +static int dasd_state_known_to_new(struct dasd_device * device) { /* Disable extended error reporting for this device. */ @@ -164,12 +164,13 @@ dasd_state_known_to_new(struct dasd_device * device) /* Give up reference we took in dasd_state_new_to_known. */ dasd_put_device(device); + return 0; } /* * Request the irq line for the device. */ -static inline int +static int dasd_state_known_to_basic(struct dasd_device * device) { int rc; @@ -193,17 +194,23 @@ dasd_state_known_to_basic(struct dasd_device * device) /* * Release the irq line for the device. Terminate any running i/o. */ -static inline void +static int dasd_state_basic_to_known(struct dasd_device * device) { + int rc; + dasd_gendisk_free(device); - dasd_flush_ccw_queue(device, 1); + rc = dasd_flush_ccw_queue(device, 1); + if (rc) + return rc; + DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); if (device->debug_area != NULL) { debug_unregister(device->debug_area); device->debug_area = NULL; } device->state = DASD_STATE_KNOWN; + return 0; } /* @@ -220,7 +227,7 @@ dasd_state_basic_to_known(struct dasd_device * device) * In case the analysis returns an error, the device setup is stopped * (a fake disk was already added to allow formatting). */ -static inline int +static int dasd_state_basic_to_ready(struct dasd_device * device) { int rc; @@ -248,25 +255,31 @@ dasd_state_basic_to_ready(struct dasd_device * device) * Forget format information. Check if the target level is basic * and if it is create fake disk for formatting. */ -static inline void +static int dasd_state_ready_to_basic(struct dasd_device * device) { - dasd_flush_ccw_queue(device, 0); + int rc; + + rc = dasd_flush_ccw_queue(device, 0); + if (rc) + return rc; dasd_destroy_partitions(device); dasd_flush_request_queue(device); device->blocks = 0; device->bp_block = 0; device->s2b_shift = 0; device->state = DASD_STATE_BASIC; + return 0; } /* * Back to basic. */ -static inline void +static int dasd_state_unfmt_to_basic(struct dasd_device * device) { device->state = DASD_STATE_BASIC; + return 0; } /* @@ -274,7 +287,7 @@ dasd_state_unfmt_to_basic(struct dasd_device * device) * the requeueing of requests from the linux request queue to the * ccw queue. */ -static inline int +static int dasd_state_ready_to_online(struct dasd_device * device) { device->state = DASD_STATE_ONLINE; @@ -285,16 +298,17 @@ dasd_state_ready_to_online(struct dasd_device * device) /* * Stop the requeueing of requests again. */ -static inline void +static int dasd_state_online_to_ready(struct dasd_device * device) { device->state = DASD_STATE_READY; + return 0; } /* * Device startup state changes. */ -static inline int +static int dasd_increase_state(struct dasd_device *device) { int rc; @@ -330,30 +344,37 @@ dasd_increase_state(struct dasd_device *device) /* * Device shutdown state changes. */ -static inline int +static int dasd_decrease_state(struct dasd_device *device) { + int rc; + + rc = 0; if (device->state == DASD_STATE_ONLINE && device->target <= DASD_STATE_READY) - dasd_state_online_to_ready(device); - - if (device->state == DASD_STATE_READY && + rc = dasd_state_online_to_ready(device); + + if (!rc && + device->state == DASD_STATE_READY && device->target <= DASD_STATE_BASIC) - dasd_state_ready_to_basic(device); + rc = dasd_state_ready_to_basic(device); - if (device->state == DASD_STATE_UNFMT && + if (!rc && + device->state == DASD_STATE_UNFMT && device->target <= DASD_STATE_BASIC) - dasd_state_unfmt_to_basic(device); + rc = dasd_state_unfmt_to_basic(device); - if (device->state == DASD_STATE_BASIC && + if (!rc && + device->state == DASD_STATE_BASIC && device->target <= DASD_STATE_KNOWN) - dasd_state_basic_to_known(device); - - if (device->state == DASD_STATE_KNOWN && + rc = dasd_state_basic_to_known(device); + + if (!rc && + device->state == DASD_STATE_KNOWN && device->target <= DASD_STATE_NEW) - dasd_state_known_to_new(device); + rc = dasd_state_known_to_new(device); - return 0; + return rc; } /* @@ -702,6 +723,7 @@ dasd_term_IO(struct dasd_ccw_req * cqr) cqr->retries--; cqr->status = DASD_CQR_CLEAR; cqr->stopclk = get_clock(); + cqr->starttime = 0; DBF_DEV_EVENT(DBF_DEBUG, device, "terminate cqr %p successful", cqr); @@ -979,6 +1001,7 @@ dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) { cqr->status = DASD_CQR_QUEUED; dasd_clear_timer(device); + wake_up(&dasd_flush_wq); dasd_schedule_bh(device); return; } @@ -994,7 +1017,7 @@ dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, ((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr); /* Find out the appropriate era_action. */ - if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) + if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) era = dasd_era_fatal; else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && irb->scsw.cstat == 0 && @@ -1004,7 +1027,7 @@ dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, era = dasd_era_fatal; /* don't recover this request */ else if (irb->esw.esw0.erw.cons) era = device->discipline->examine_error(cqr, irb); - else + else era = dasd_era_recover; DBF_DEV_EVENT(DBF_DEBUG, device, "era_code %d", era); @@ -1242,6 +1265,10 @@ __dasd_check_expire(struct dasd_device * device) cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); if (cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) { if (time_after_eq(jiffies, cqr->expires + cqr->starttime)) { + DEV_MESSAGE(KERN_ERR, device, + "internal error - timeout (%is) expired " + "for cqr %p (%i retries left)", + (cqr->expires/HZ), cqr, cqr->retries); if (device->discipline->term_IO(cqr) != 0) /* Hmpf, try again in 1/10 sec */ dasd_set_timer(device, 10); @@ -1286,46 +1313,100 @@ __dasd_start_head(struct dasd_device * device) dasd_set_timer(device, 50); } +static inline int +_wait_for_clear(struct dasd_ccw_req *cqr) +{ + return (cqr->status == DASD_CQR_QUEUED); +} + /* - * Remove requests from the ccw queue. + * Remove all requests from the ccw queue (all = '1') or only block device + * requests in case all = '0'. + * Take care of the erp-chain (chained via cqr->refers) and remove either + * the whole erp-chain or none of the erp-requests. + * If a request is currently running, term_IO is called and the request + * is re-queued. Prior to removing the terminated request we need to wait + * for the clear-interrupt. + * In case termination is not possible we stop processing and just finishing + * the already moved requests. */ -static void +static int dasd_flush_ccw_queue(struct dasd_device * device, int all) { + struct dasd_ccw_req *cqr, *orig, *n; + int rc, i; + struct list_head flush_queue; - struct list_head *l, *n; - struct dasd_ccw_req *cqr; INIT_LIST_HEAD(&flush_queue); spin_lock_irq(get_ccwdev_lock(device->cdev)); - list_for_each_safe(l, n, &device->ccw_queue) { - cqr = list_entry(l, struct dasd_ccw_req, list); + rc = 0; +restart: + list_for_each_entry_safe(cqr, n, &device->ccw_queue, list) { + /* get original request of erp request-chain */ + for (orig = cqr; orig->refers != NULL; orig = orig->refers); + /* Flush all request or only block device requests? */ - if (all == 0 && cqr->callback == dasd_end_request_cb) + if (all == 0 && cqr->callback != dasd_end_request_cb && + orig->callback != dasd_end_request_cb) { continue; - if (cqr->status == DASD_CQR_IN_IO) - device->discipline->term_IO(cqr); - if (cqr->status != DASD_CQR_DONE || - cqr->status != DASD_CQR_FAILED) { - cqr->status = DASD_CQR_FAILED; + } + /* Check status and move request to flush_queue */ + switch (cqr->status) { + case DASD_CQR_IN_IO: + rc = device->discipline->term_IO(cqr); + if (rc) { + /* unable to terminate requeust */ + DEV_MESSAGE(KERN_ERR, device, + "dasd flush ccw_queue is unable " + " to terminate request %p", + cqr); + /* stop flush processing */ + goto finished; + } + break; + case DASD_CQR_QUEUED: + case DASD_CQR_ERROR: + /* set request to FAILED */ cqr->stopclk = get_clock(); + cqr->status = DASD_CQR_FAILED; + break; + default: /* do not touch the others */ + break; + } + /* Rechain request (including erp chain) */ + for (i = 0; cqr != NULL; cqr = cqr->refers, i++) { + cqr->endclk = get_clock(); + list_move_tail(&cqr->list, &flush_queue); + } + if (i > 1) + /* moved more than one request - need to restart */ + goto restart; + } + +finished: + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + /* Now call the callback function of flushed requests */ +restart_cb: + list_for_each_entry_safe(cqr, n, &flush_queue, list) { + if (cqr->status == DASD_CQR_CLEAR) { + /* wait for clear interrupt! */ + wait_event(dasd_flush_wq, _wait_for_clear(cqr)); + cqr->status = DASD_CQR_FAILED; } /* Process finished ERP request. */ if (cqr->refers) { __dasd_process_erp(device, cqr); - continue; + /* restart list_for_xx loop since dasd_process_erp + * might remove multiple elements */ + goto restart_cb; } - /* Rechain request on device request queue */ + /* call the callback function */ cqr->endclk = get_clock(); - list_move_tail(&cqr->list, &flush_queue); - } - spin_unlock_irq(get_ccwdev_lock(device->cdev)); - /* Now call the callback function of flushed requests */ - list_for_each_safe(l, n, &flush_queue) { - cqr = list_entry(l, struct dasd_ccw_req, list); if (cqr->callback != NULL) (cqr->callback)(cqr, cqr->callback_data); } + return rc; } /* @@ -1450,23 +1531,23 @@ dasd_sleep_on(struct dasd_ccw_req * cqr) wait_queue_head_t wait_q; struct dasd_device *device; int rc; - + device = cqr->device; spin_lock_irq(get_ccwdev_lock(device->cdev)); - + init_waitqueue_head (&wait_q); cqr->callback = dasd_wakeup_cb; cqr->callback_data = (void *) &wait_q; cqr->status = DASD_CQR_QUEUED; list_add_tail(&cqr->list, &device->ccw_queue); - + /* let the bh start the request to keep them in order */ dasd_schedule_bh(device); - + spin_unlock_irq(get_ccwdev_lock(device->cdev)); wait_event(wait_q, _wait_for_wakeup(cqr)); - + /* Request status is either done or failed. */ rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; return rc; @@ -1511,10 +1592,8 @@ dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr) if (device->discipline->term_IO) { cqr->retries = -1; device->discipline->term_IO(cqr); - /*nished = - * wait (non-interruptible) for final status - * because signal ist still pending - */ + /* wait (non-interruptible) for final status + * because signal ist still pending */ spin_unlock_irq(get_ccwdev_lock(device->cdev)); wait_event(wait_q, _wait_for_wakeup(cqr)); spin_lock_irq(get_ccwdev_lock(device->cdev)); @@ -1547,19 +1626,11 @@ static inline int _dasd_term_running_cqr(struct dasd_device *device) { struct dasd_ccw_req *cqr; - int rc; if (list_empty(&device->ccw_queue)) return 0; cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); - rc = device->discipline->term_IO(cqr); - if (rc == 0) { - /* termination successful */ - cqr->status = DASD_CQR_QUEUED; - cqr->startclk = cqr->stopclk = 0; - cqr->starttime = 0; - } - return rc; + return device->discipline->term_IO(cqr); } int @@ -1568,7 +1639,7 @@ dasd_sleep_on_immediatly(struct dasd_ccw_req * cqr) wait_queue_head_t wait_q; struct dasd_device *device; int rc; - + device = cqr->device; spin_lock_irq(get_ccwdev_lock(device->cdev)); rc = _dasd_term_running_cqr(device); @@ -1576,20 +1647,20 @@ dasd_sleep_on_immediatly(struct dasd_ccw_req * cqr) spin_unlock_irq(get_ccwdev_lock(device->cdev)); return rc; } - + init_waitqueue_head (&wait_q); cqr->callback = dasd_wakeup_cb; cqr->callback_data = (void *) &wait_q; cqr->status = DASD_CQR_QUEUED; list_add(&cqr->list, &device->ccw_queue); - + /* let the bh start the request to keep them in order */ dasd_schedule_bh(device); - + spin_unlock_irq(get_ccwdev_lock(device->cdev)); wait_event(wait_q, _wait_for_wakeup(cqr)); - + /* Request status is either done or failed. */ rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; return rc; @@ -1725,14 +1796,11 @@ dasd_flush_request_queue(struct dasd_device * device) if (!device->request_queue) return; - + spin_lock_irq(&device->request_queue_lock); - while (!list_empty(&device->request_queue->queue_head)) { - req = elv_next_request(device->request_queue); - if (req == NULL) - break; - dasd_end_request(req, 0); + while ((req = elv_next_request(device->request_queue))) { blkdev_dequeue_request(req); + dasd_end_request(req, 0); } spin_unlock_irq(&device->request_queue_lock); } @@ -1834,7 +1902,6 @@ dasd_exit(void) } dasd_gendisk_exit(); dasd_devmap_exit(); - devfs_remove("dasd"); if (dasd_debug_area != NULL) { debug_unregister(dasd_debug_area); dasd_debug_area = NULL; @@ -1855,15 +1922,34 @@ dasd_generic_probe (struct ccw_device *cdev, { int ret; + ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); + if (ret) { + printk(KERN_WARNING + "dasd_generic_probe: could not set ccw-device options " + "for %s\n", cdev->dev.bus_id); + return ret; + } ret = dasd_add_sysfs_files(cdev); if (ret) { printk(KERN_WARNING "dasd_generic_probe: could not add sysfs entries " "for %s\n", cdev->dev.bus_id); - } else { - cdev->handler = &dasd_int_handler; + return ret; } + cdev->handler = &dasd_int_handler; + /* + * Automatically online either all dasd devices (dasd_autodetect) + * or all devices specified with dasd= parameters during + * initial probe. + */ + if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || + (dasd_autodetect && dasd_busid_known(cdev->dev.bus_id) != 0)) + ret = ccw_device_set_online(cdev); + if (ret) + printk(KERN_WARNING + "dasd_generic_probe: could not initially online " + "ccw-device %s\n", cdev->dev.bus_id); return ret; } @@ -1911,6 +1997,8 @@ dasd_generic_set_online (struct ccw_device *cdev, struct dasd_device *device; int rc; + /* first online clears initial online feature flag */ + dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); device = dasd_create_device(cdev); if (IS_ERR(device)) return PTR_ERR(device); @@ -2065,31 +2153,6 @@ dasd_generic_notify(struct ccw_device *cdev, int event) return ret; } -/* - * Automatically online either all dasd devices (dasd_autodetect) or - * all devices specified with dasd= parameters. - */ -static int -__dasd_auto_online(struct device *dev, void *data) -{ - struct ccw_device *cdev; - - cdev = to_ccwdev(dev); - if (dasd_autodetect || dasd_busid_known(cdev->dev.bus_id) == 0) - ccw_device_set_online(cdev); - return 0; -} - -void -dasd_generic_auto_online (struct ccw_driver *dasd_discipline_driver) -{ - struct device_driver *drv; - - drv = get_driver(&dasd_discipline_driver->driver); - driver_for_each_device(drv, NULL, NULL, __dasd_auto_online); - put_driver(drv); -} - static int __init dasd_init(void) @@ -2097,6 +2160,7 @@ dasd_init(void) int rc; init_waitqueue_head(&dasd_init_waitq); + init_waitqueue_head(&dasd_flush_wq); /* register 'common' DASD debug area, used for all DBF_XXX calls */ dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof (long)); @@ -2111,9 +2175,6 @@ dasd_init(void) dasd_diag_discipline_pointer = NULL; - rc = devfs_mk_dir("dasd"); - if (rc) - goto failed; rc = dasd_devmap_init(); if (rc) goto failed; @@ -2170,23 +2231,4 @@ EXPORT_SYMBOL_GPL(dasd_generic_remove); EXPORT_SYMBOL_GPL(dasd_generic_notify); EXPORT_SYMBOL_GPL(dasd_generic_set_online); EXPORT_SYMBOL_GPL(dasd_generic_set_offline); -EXPORT_SYMBOL_GPL(dasd_generic_auto_online); -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-indent-level: 4 - * c-brace-imaginary-offset: 0 - * c-brace-offset: -4 - * c-argdecl-indent: 4 - * c-label-offset: -4 - * c-continued-statement-offset: 4 - * c-continued-brace-offset: 0 - * indent-tabs-mode: 1 - * tab-width: 8 - * End: - */