| /* |
| * File...........: linux/drivers/s390/block/dasd.c |
| * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> |
| * Horst Hummel <Horst.Hummel@de.ibm.com> |
| * Carsten Otte <Cotte@de.ibm.com> |
| * Martin Schwidefsky <schwidefsky@de.ibm.com> |
| * Bugreports.to..: <Linux390@de.ibm.com> |
| * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 |
| * |
| */ |
| |
| #include <linux/kmod.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/ctype.h> |
| #include <linux/major.h> |
| #include <linux/slab.h> |
| #include <linux/buffer_head.h> |
| #include <linux/hdreg.h> |
| |
| #include <asm/ccwdev.h> |
| #include <asm/ebcdic.h> |
| #include <asm/idals.h> |
| #include <asm/todclk.h> |
| |
| /* This is ugly... */ |
| #define PRINTK_HEADER "dasd:" |
| |
| #include "dasd_int.h" |
| /* |
| * SECTION: Constant definitions to be used within this file |
| */ |
| #define DASD_CHANQ_MAX_SIZE 4 |
| |
| /* |
| * SECTION: exported variables of dasd.c |
| */ |
| debug_info_t *dasd_debug_area; |
| struct dasd_discipline *dasd_diag_discipline_pointer; |
| |
| MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); |
| MODULE_DESCRIPTION("Linux on S/390 DASD device driver," |
| " Copyright 2000 IBM Corporation"); |
| MODULE_SUPPORTED_DEVICE("dasd"); |
| MODULE_LICENSE("GPL"); |
| |
| /* |
| * SECTION: prototypes for static functions of dasd.c |
| */ |
| static int dasd_alloc_queue(struct dasd_device * device); |
| 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 int dasd_flush_ccw_queue(struct dasd_device *, int); |
| static void dasd_tasklet(struct dasd_device *); |
| static void do_kick_device(struct work_struct *); |
| |
| /* |
| * 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. |
| */ |
| struct dasd_device * |
| dasd_alloc_device(void) |
| { |
| struct dasd_device *device; |
| |
| device = kzalloc(sizeof (struct dasd_device), GFP_ATOMIC); |
| if (device == NULL) |
| return ERR_PTR(-ENOMEM); |
| /* open_count = 0 means device online but not in use */ |
| atomic_set(&device->open_count, -1); |
| |
| /* Get two pages for normal block device operations. */ |
| device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); |
| if (device->ccw_mem == NULL) { |
| kfree(device); |
| return ERR_PTR(-ENOMEM); |
| } |
| /* Get one page for error recovery. */ |
| device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); |
| if (device->erp_mem == NULL) { |
| free_pages((unsigned long) device->ccw_mem, 1); |
| kfree(device); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); |
| dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); |
| spin_lock_init(&device->mem_lock); |
| spin_lock_init(&device->request_queue_lock); |
| atomic_set (&device->tasklet_scheduled, 0); |
| tasklet_init(&device->tasklet, |
| (void (*)(unsigned long)) dasd_tasklet, |
| (unsigned long) device); |
| INIT_LIST_HEAD(&device->ccw_queue); |
| init_timer(&device->timer); |
| INIT_WORK(&device->kick_work, do_kick_device); |
| device->state = DASD_STATE_NEW; |
| device->target = DASD_STATE_NEW; |
| |
| return device; |
| } |
| |
| /* |
| * Free memory of a device structure. |
| */ |
| void |
| dasd_free_device(struct dasd_device *device) |
| { |
| kfree(device->private); |
| free_page((unsigned long) device->erp_mem); |
| free_pages((unsigned long) device->ccw_mem, 1); |
| kfree(device); |
| } |
| |
| /* |
| * Make a new device known to the system. |
| */ |
| 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 |
| * keep the reference count > 0. |
| */ |
| dasd_get_device(device); |
| |
| rc = dasd_alloc_queue(device); |
| if (rc) { |
| dasd_put_device(device); |
| return rc; |
| } |
| |
| device->state = DASD_STATE_KNOWN; |
| return 0; |
| } |
| |
| /* |
| * Let the system forget about a device. |
| */ |
| static int |
| dasd_state_known_to_new(struct dasd_device * device) |
| { |
| /* Disable extended error reporting for this device. */ |
| dasd_eer_disable(device); |
| /* Forget the discipline information. */ |
| if (device->discipline) |
| module_put(device->discipline->owner); |
| device->discipline = NULL; |
| if (device->base_discipline) |
| module_put(device->base_discipline->owner); |
| device->base_discipline = NULL; |
| device->state = DASD_STATE_NEW; |
| |
| dasd_free_queue(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 int |
| dasd_state_known_to_basic(struct dasd_device * device) |
| { |
| int rc; |
| |
| /* Allocate and register gendisk structure. */ |
| rc = dasd_gendisk_alloc(device); |
| if (rc) |
| return rc; |
| |
| /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
| device->debug_area = debug_register(device->cdev->dev.bus_id, 1, 2, |
| 8 * sizeof (long)); |
| debug_register_view(device->debug_area, &debug_sprintf_view); |
| debug_set_level(device->debug_area, DBF_WARNING); |
| DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
| |
| device->state = DASD_STATE_BASIC; |
| return 0; |
| } |
| |
| /* |
| * Release the irq line for the device. Terminate any running i/o. |
| */ |
| static int |
| dasd_state_basic_to_known(struct dasd_device * device) |
| { |
| int rc; |
| |
| dasd_gendisk_free(device); |
| rc = dasd_flush_ccw_queue(device, 1); |
| if (rc) |
| return rc; |
| dasd_clear_timer(device); |
| |
| 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; |
| } |
| |
| /* |
| * Do the initial analysis. The do_analysis function may return |
| * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC |
| * until the discipline decides to continue the startup sequence |
| * by calling the function dasd_change_state. The eckd disciplines |
| * uses this to start a ccw that detects the format. The completion |
| * interrupt for this detection ccw uses the kernel event daemon to |
| * trigger the call to dasd_change_state. All this is done in the |
| * discipline code, see dasd_eckd.c. |
| * After the analysis ccw is done (do_analysis returned 0) the block |
| * device is setup. |
| * In case the analysis returns an error, the device setup is stopped |
| * (a fake disk was already added to allow formatting). |
| */ |
| static int |
| dasd_state_basic_to_ready(struct dasd_device * device) |
| { |
| int rc; |
| |
| rc = 0; |
| if (device->discipline->do_analysis != NULL) |
| rc = device->discipline->do_analysis(device); |
| if (rc) { |
| if (rc != -EAGAIN) |
| device->state = DASD_STATE_UNFMT; |
| return rc; |
| } |
| /* make disk known with correct capacity */ |
| dasd_setup_queue(device); |
| set_capacity(device->gdp, device->blocks << device->s2b_shift); |
| device->state = DASD_STATE_READY; |
| rc = dasd_scan_partitions(device); |
| if (rc) |
| device->state = DASD_STATE_BASIC; |
| return rc; |
| } |
| |
| /* |
| * Remove device from block device layer. Destroy dirty buffers. |
| * Forget format information. Check if the target level is basic |
| * and if it is create fake disk for formatting. |
| */ |
| static int |
| dasd_state_ready_to_basic(struct dasd_device * device) |
| { |
| 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 int |
| dasd_state_unfmt_to_basic(struct dasd_device * device) |
| { |
| device->state = DASD_STATE_BASIC; |
| return 0; |
| } |
| |
| /* |
| * Make the device online and schedule the bottom half to start |
| * the requeueing of requests from the linux request queue to the |
| * ccw queue. |
| */ |
| static int |
| dasd_state_ready_to_online(struct dasd_device * device) |
| { |
| device->state = DASD_STATE_ONLINE; |
| dasd_schedule_bh(device); |
| return 0; |
| } |
| |
| /* |
| * Stop the requeueing of requests again. |
| */ |
| static int |
| dasd_state_online_to_ready(struct dasd_device * device) |
| { |
| device->state = DASD_STATE_READY; |
| return 0; |
| } |
| |
| /* |
| * Device startup state changes. |
| */ |
| static int |
| dasd_increase_state(struct dasd_device *device) |
| { |
| int rc; |
| |
| rc = 0; |
| if (device->state == DASD_STATE_NEW && |
| device->target >= DASD_STATE_KNOWN) |
| rc = dasd_state_new_to_known(device); |
| |
| if (!rc && |
| device->state == DASD_STATE_KNOWN && |
| device->target >= DASD_STATE_BASIC) |
| rc = dasd_state_known_to_basic(device); |
| |
| if (!rc && |
| device->state == DASD_STATE_BASIC && |
| device->target >= DASD_STATE_READY) |
| rc = dasd_state_basic_to_ready(device); |
| |
| if (!rc && |
| device->state == DASD_STATE_UNFMT && |
| device->target > DASD_STATE_UNFMT) |
| rc = -EPERM; |
| |
| if (!rc && |
| device->state == DASD_STATE_READY && |
| device->target >= DASD_STATE_ONLINE) |
| rc = dasd_state_ready_to_online(device); |
| |
| return rc; |
| } |
| |
| /* |
| * Device shutdown state changes. |
| */ |
| static int |
| dasd_decrease_state(struct dasd_device *device) |
| { |
| int rc; |
| |
| rc = 0; |
| if (device->state == DASD_STATE_ONLINE && |
| device->target <= DASD_STATE_READY) |
| rc = dasd_state_online_to_ready(device); |
| |
| if (!rc && |
| device->state == DASD_STATE_READY && |
| device->target <= DASD_STATE_BASIC) |
| rc = dasd_state_ready_to_basic(device); |
| |
| if (!rc && |
| device->state == DASD_STATE_UNFMT && |
| device->target <= DASD_STATE_BASIC) |
| rc = dasd_state_unfmt_to_basic(device); |
| |
| if (!rc && |
| device->state == DASD_STATE_BASIC && |
| device->target <= DASD_STATE_KNOWN) |
| rc = dasd_state_basic_to_known(device); |
| |
| if (!rc && |
| device->state == DASD_STATE_KNOWN && |
| device->target <= DASD_STATE_NEW) |
| rc = dasd_state_known_to_new(device); |
| |
| return rc; |
| } |
| |
| /* |
| * This is the main startup/shutdown routine. |
| */ |
| static void |
| dasd_change_state(struct dasd_device *device) |
| { |
| int rc; |
| |
| if (device->state == device->target) |
| /* Already where we want to go today... */ |
| return; |
| if (device->state < device->target) |
| rc = dasd_increase_state(device); |
| else |
| rc = dasd_decrease_state(device); |
| if (rc && rc != -EAGAIN) |
| device->target = device->state; |
| |
| if (device->state == device->target) |
| wake_up(&dasd_init_waitq); |
| } |
| |
| /* |
| * Kick starter for devices that did not complete the startup/shutdown |
| * procedure or were sleeping because of a pending state. |
| * dasd_kick_device will schedule a call do do_kick_device to the kernel |
| * event daemon. |
| */ |
| static void |
| do_kick_device(struct work_struct *work) |
| { |
| struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
| dasd_change_state(device); |
| dasd_schedule_bh(device); |
| dasd_put_device(device); |
| } |
| |
| void |
| dasd_kick_device(struct dasd_device *device) |
| { |
| dasd_get_device(device); |
| /* queue call to dasd_kick_device to the kernel event daemon. */ |
| schedule_work(&device->kick_work); |
| } |
| |
| /* |
| * Set the target state for a device and starts the state change. |
| */ |
| void |
| dasd_set_target_state(struct dasd_device *device, int target) |
| { |
| /* If we are in probeonly mode stop at DASD_STATE_READY. */ |
| if (dasd_probeonly && target > DASD_STATE_READY) |
| target = DASD_STATE_READY; |
| if (device->target != target) { |
| if (device->state == target) |
| wake_up(&dasd_init_waitq); |
| device->target = target; |
| } |
| if (device->state != device->target) |
| dasd_change_state(device); |
| } |
| |
| /* |
| * Enable devices with device numbers in [from..to]. |
| */ |
| static inline int |
| _wait_for_device(struct dasd_device *device) |
| { |
| return (device->state == device->target); |
| } |
| |
| void |
| dasd_enable_device(struct dasd_device *device) |
| { |
| dasd_set_target_state(device, DASD_STATE_ONLINE); |
| if (device->state <= DASD_STATE_KNOWN) |
| /* No discipline for device found. */ |
| dasd_set_target_state(device, DASD_STATE_NEW); |
| /* Now wait for the devices to come up. */ |
| wait_event(dasd_init_waitq, _wait_for_device(device)); |
| } |
| |
| /* |
| * SECTION: device operation (interrupt handler, start i/o, term i/o ...) |
| */ |
| #ifdef CONFIG_DASD_PROFILE |
| |
| struct dasd_profile_info_t dasd_global_profile; |
| unsigned int dasd_profile_level = DASD_PROFILE_OFF; |
| |
| /* |
| * Increments counter in global and local profiling structures. |
| */ |
| #define dasd_profile_counter(value, counter, device) \ |
| { \ |
| int index; \ |
| for (index = 0; index < 31 && value >> (2+index); index++); \ |
| dasd_global_profile.counter[index]++; \ |
| device->profile.counter[index]++; \ |
| } |
| |
| /* |
| * Add profiling information for cqr before execution. |
| */ |
| static inline void |
| dasd_profile_start(struct dasd_device *device, struct dasd_ccw_req * cqr, |
| struct request *req) |
| { |
| struct list_head *l; |
| unsigned int counter; |
| |
| if (dasd_profile_level != DASD_PROFILE_ON) |
| return; |
| |
| /* count the length of the chanq for statistics */ |
| counter = 0; |
| list_for_each(l, &device->ccw_queue) |
| if (++counter >= 31) |
| break; |
| dasd_global_profile.dasd_io_nr_req[counter]++; |
| device->profile.dasd_io_nr_req[counter]++; |
| } |
| |
| /* |
| * Add profiling information for cqr after execution. |
| */ |
| static inline void |
| dasd_profile_end(struct dasd_device *device, struct dasd_ccw_req * cqr, |
| struct request *req) |
| { |
| long strtime, irqtime, endtime, tottime; /* in microseconds */ |
| long tottimeps, sectors; |
| |
| if (dasd_profile_level != DASD_PROFILE_ON) |
| return; |
| |
| sectors = req->nr_sectors; |
| if (!cqr->buildclk || !cqr->startclk || |
| !cqr->stopclk || !cqr->endclk || |
| !sectors) |
| return; |
| |
| strtime = ((cqr->startclk - cqr->buildclk) >> 12); |
| irqtime = ((cqr->stopclk - cqr->startclk) >> 12); |
| endtime = ((cqr->endclk - cqr->stopclk) >> 12); |
| tottime = ((cqr->endclk - cqr->buildclk) >> 12); |
| tottimeps = tottime / sectors; |
| |
| if (!dasd_global_profile.dasd_io_reqs) |
| memset(&dasd_global_profile, 0, |
| sizeof (struct dasd_profile_info_t)); |
| dasd_global_profile.dasd_io_reqs++; |
| dasd_global_profile.dasd_io_sects += sectors; |
| |
| if (!device->profile.dasd_io_reqs) |
| memset(&device->profile, 0, |
| sizeof (struct dasd_profile_info_t)); |
| device->profile.dasd_io_reqs++; |
| device->profile.dasd_io_sects += sectors; |
| |
| dasd_profile_counter(sectors, dasd_io_secs, device); |
| dasd_profile_counter(tottime, dasd_io_times, device); |
| dasd_profile_counter(tottimeps, dasd_io_timps, device); |
| dasd_profile_counter(strtime, dasd_io_time1, device); |
| dasd_profile_counter(irqtime, dasd_io_time2, device); |
| dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, device); |
| dasd_profile_counter(endtime, dasd_io_time3, device); |
| } |
| #else |
| #define dasd_profile_start(device, cqr, req) do {} while (0) |
| #define dasd_profile_end(device, cqr, req) do {} while (0) |
| #endif /* CONFIG_DASD_PROFILE */ |
| |
| /* |
| * Allocate memory for a channel program with 'cplength' channel |
| * command words and 'datasize' additional space. There are two |
| * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed |
| * memory and 2) dasd_smalloc_request uses the static ccw memory |
| * that gets allocated for each device. |
| */ |
| struct dasd_ccw_req * |
| dasd_kmalloc_request(char *magic, int cplength, int datasize, |
| struct dasd_device * device) |
| { |
| struct dasd_ccw_req *cqr; |
| |
| /* Sanity checks */ |
| BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
| (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
| |
| cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
| if (cqr == NULL) |
| return ERR_PTR(-ENOMEM); |
| cqr->cpaddr = NULL; |
| if (cplength > 0) { |
| cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
| GFP_ATOMIC | GFP_DMA); |
| if (cqr->cpaddr == NULL) { |
| kfree(cqr); |
| return ERR_PTR(-ENOMEM); |
| } |
| } |
| cqr->data = NULL; |
| if (datasize > 0) { |
| cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
| if (cqr->data == NULL) { |
| kfree(cqr->cpaddr); |
| kfree(cqr); |
| return ERR_PTR(-ENOMEM); |
| } |
| } |
| strncpy((char *) &cqr->magic, magic, 4); |
| ASCEBC((char *) &cqr->magic, 4); |
| set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
| dasd_get_device(device); |
| return cqr; |
| } |
| |
| struct dasd_ccw_req * |
| dasd_smalloc_request(char *magic, int cplength, int datasize, |
| struct dasd_device * device) |
| { |
| unsigned long flags; |
| struct dasd_ccw_req *cqr; |
| char *data; |
| int size; |
| |
| /* Sanity checks */ |
| BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
| (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
| |
| size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; |
| if (cplength > 0) |
| size += cplength * sizeof(struct ccw1); |
| if (datasize > 0) |
| size += datasize; |
| spin_lock_irqsave(&device->mem_lock, flags); |
| cqr = (struct dasd_ccw_req *) |
| dasd_alloc_chunk(&device->ccw_chunks, size); |
| spin_unlock_irqrestore(&device->mem_lock, flags); |
| if (cqr == NULL) |
| return ERR_PTR(-ENOMEM); |
| memset(cqr, 0, sizeof(struct dasd_ccw_req)); |
| data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); |
| cqr->cpaddr = NULL; |
| if (cplength > 0) { |
| cqr->cpaddr = (struct ccw1 *) data; |
| data += cplength*sizeof(struct ccw1); |
| memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); |
| } |
| cqr->data = NULL; |
| if (datasize > 0) { |
| cqr->data = data; |
| memset(cqr->data, 0, datasize); |
| } |
| strncpy((char *) &cqr->magic, magic, 4); |
| ASCEBC((char *) &cqr->magic, 4); |
| set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
| dasd_get_device(device); |
| return cqr; |
| } |
| |
| /* |
| * Free memory of a channel program. This function needs to free all the |
| * idal lists that might have been created by dasd_set_cda and the |
| * struct dasd_ccw_req itself. |
| */ |
| void |
| dasd_kfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) |
| { |
| #ifdef CONFIG_64BIT |
| struct ccw1 *ccw; |
| |
| /* Clear any idals used for the request. */ |
| ccw = cqr->cpaddr; |
| do { |
| clear_normalized_cda(ccw); |
| } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); |
| #endif |
| kfree(cqr->cpaddr); |
| kfree(cqr->data); |
| kfree(cqr); |
| dasd_put_device(device); |
| } |
| |
| void |
| dasd_sfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&device->mem_lock, flags); |
| dasd_free_chunk(&device->ccw_chunks, cqr); |
| spin_unlock_irqrestore(&device->mem_lock, flags); |
| dasd_put_device(device); |
| } |
| |
| /* |
| * Check discipline magic in cqr. |
| */ |
| static inline int |
| dasd_check_cqr(struct dasd_ccw_req *cqr) |
| { |
| struct dasd_device *device; |
| |
| if (cqr == NULL) |
| return -EINVAL; |
| device = cqr->device; |
| if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
| DEV_MESSAGE(KERN_WARNING, device, |
| " dasd_ccw_req 0x%08x magic doesn't match" |
| " discipline 0x%08x", |
| cqr->magic, |
| *(unsigned int *) device->discipline->name); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| /* |
| * Terminate the current i/o and set the request to clear_pending. |
| * Timer keeps device runnig. |
| * ccw_device_clear can fail if the i/o subsystem |
| * is in a bad mood. |
| */ |
| int |
| dasd_term_IO(struct dasd_ccw_req * cqr) |
| { |
| struct dasd_device *device; |
| int retries, rc; |
| |
| /* Check the cqr */ |
| rc = dasd_check_cqr(cqr); |
| if (rc) |
| return rc; |
| retries = 0; |
| device = (struct dasd_device *) cqr->device; |
| while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
| rc = ccw_device_clear(device->cdev, (long) cqr); |
| switch (rc) { |
| case 0: /* termination successful */ |
| 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); |
| break; |
| case -ENODEV: |
| DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| "device gone, retry"); |
| break; |
| case -EIO: |
| DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| "I/O error, retry"); |
| break; |
| case -EINVAL: |
| case -EBUSY: |
| DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| "device busy, retry later"); |
| break; |
| default: |
| DEV_MESSAGE(KERN_ERR, device, |
| "line %d unknown RC=%d, please " |
| "report to linux390@de.ibm.com", |
| __LINE__, rc); |
| BUG(); |
| break; |
| } |
| retries++; |
| } |
| dasd_schedule_bh(device); |
| return rc; |
| } |
| |
| /* |
| * Start the i/o. This start_IO can fail if the channel is really busy. |
| * In that case set up a timer to start the request later. |
| */ |
| int |
| dasd_start_IO(struct dasd_ccw_req * cqr) |
| { |
| struct dasd_device *device; |
| int rc; |
| |
| /* Check the cqr */ |
| rc = dasd_check_cqr(cqr); |
| if (rc) |
| return rc; |
| device = (struct dasd_device *) cqr->device; |
| if (cqr->retries < 0) { |
| DEV_MESSAGE(KERN_DEBUG, device, |
| "start_IO: request %p (%02x/%i) - no retry left.", |
| cqr, cqr->status, cqr->retries); |
| cqr->status = DASD_CQR_FAILED; |
| return -EIO; |
| } |
| cqr->startclk = get_clock(); |
| cqr->starttime = jiffies; |
| cqr->retries--; |
| rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr, |
| cqr->lpm, 0); |
| switch (rc) { |
| case 0: |
| cqr->status = DASD_CQR_IN_IO; |
| DBF_DEV_EVENT(DBF_DEBUG, device, |
| "start_IO: request %p started successful", |
| cqr); |
| break; |
| case -EBUSY: |
| DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| "start_IO: device busy, retry later"); |
| break; |
| case -ETIMEDOUT: |
| DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| "start_IO: request timeout, retry later"); |
| break; |
| case -EACCES: |
| /* -EACCES indicates that the request used only a |
| * subset of the available pathes and all these |
| * pathes are gone. |
| * Do a retry with all available pathes. |
| */ |
| cqr->lpm = LPM_ANYPATH; |
| DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| "start_IO: selected pathes gone," |
| " retry on all pathes"); |
| break; |
| case -ENODEV: |
| case -EIO: |
| DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| "start_IO: device gone, retry"); |
| break; |
| default: |
| DEV_MESSAGE(KERN_ERR, device, |
| "line %d unknown RC=%d, please report" |
| " to linux390@de.ibm.com", __LINE__, rc); |
| BUG(); |
| break; |
| } |
| return rc; |
| } |
| |
| /* |
| * Timeout function for dasd devices. This is used for different purposes |
| * 1) missing interrupt handler for normal operation |
| * 2) delayed start of request where start_IO failed with -EBUSY |
| * 3) timeout for missing state change interrupts |
| * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), |
| * DASD_CQR_QUEUED for 2) and 3). |
| */ |
| static void |
| dasd_timeout_device(unsigned long ptr) |
| { |
| unsigned long flags; |
| struct dasd_device *device; |
| |
| device = (struct dasd_device *) ptr; |
| spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
| /* re-activate request queue */ |
| device->stopped &= ~DASD_STOPPED_PENDING; |
| spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| dasd_schedule_bh(device); |
| } |
| |
| /* |
| * Setup timeout for a device in jiffies. |
| */ |
| void |
| dasd_set_timer(struct dasd_device *device, int expires) |
| { |
| if (expires == 0) { |
| if (timer_pending(&device->timer)) |
| del_timer(&device->timer); |
| return; |
| } |
| if (timer_pending(&device->timer)) { |
| if (mod_timer(&device->timer, jiffies + expires)) |
| return; |
| } |
| device->timer.function = dasd_timeout_device; |
| device->timer.data = (unsigned long) device; |
| device->timer.expires = jiffies + expires; |
| add_timer(&device->timer); |
| } |
| |
| /* |
| * Clear timeout for a device. |
| */ |
| void |
| dasd_clear_timer(struct dasd_device *device) |
| { |
| if (timer_pending(&device->timer)) |
| del_timer(&device->timer); |
| } |
| |
| static void |
| dasd_handle_killed_request(struct ccw_device *cdev, unsigned long intparm) |
| { |
| struct dasd_ccw_req *cqr; |
| struct dasd_device *device; |
| |
| cqr = (struct dasd_ccw_req *) intparm; |
| if (cqr->status != DASD_CQR_IN_IO) { |
| MESSAGE(KERN_DEBUG, |
| "invalid status in handle_killed_request: " |
| "bus_id %s, status %02x", |
| cdev->dev.bus_id, cqr->status); |
| return; |
| } |
| |
| device = (struct dasd_device *) cqr->device; |
| if (device == NULL || |
| device != dasd_device_from_cdev_locked(cdev) || |
| strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
| MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", |
| cdev->dev.bus_id); |
| return; |
| } |
| |
| /* Schedule request to be retried. */ |
| cqr->status = DASD_CQR_QUEUED; |
| |
| dasd_clear_timer(device); |
| dasd_schedule_bh(device); |
| dasd_put_device(device); |
| } |
| |
| static void |
| dasd_handle_state_change_pending(struct dasd_device *device) |
| { |
| struct dasd_ccw_req *cqr; |
| struct list_head *l, *n; |
| |
| /* First of all start sense subsystem status request. */ |
| dasd_eer_snss(device); |
| |
| device->stopped &= ~DASD_STOPPED_PENDING; |
| |
| /* restart all 'running' IO on queue */ |
| list_for_each_safe(l, n, &device->ccw_queue) { |
| cqr = list_entry(l, struct dasd_ccw_req, list); |
| if (cqr->status == DASD_CQR_IN_IO) { |
| cqr->status = DASD_CQR_QUEUED; |
| } |
| } |
| dasd_clear_timer(device); |
| dasd_schedule_bh(device); |
| } |
| |
| /* |
| * Interrupt handler for "normal" ssch-io based dasd devices. |
| */ |
| void |
| dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
| struct irb *irb) |
| { |
| struct dasd_ccw_req *cqr, *next; |
| struct dasd_device *device; |
| unsigned long long now; |
| int expires; |
| dasd_era_t era; |
| char mask; |
| |
| if (IS_ERR(irb)) { |
| switch (PTR_ERR(irb)) { |
| case -EIO: |
| dasd_handle_killed_request(cdev, intparm); |
| break; |
| case -ETIMEDOUT: |
| printk(KERN_WARNING"%s(%s): request timed out\n", |
| __FUNCTION__, cdev->dev.bus_id); |
| //FIXME - dasd uses own timeout interface... |
| break; |
| default: |
| printk(KERN_WARNING"%s(%s): unknown error %ld\n", |
| __FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb)); |
| } |
| return; |
| } |
| |
| now = get_clock(); |
| |
| DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x", |
| cdev->dev.bus_id, ((irb->scsw.cstat<<8)|irb->scsw.dstat), |
| (unsigned int) intparm); |
| |
| /* first of all check for state change pending interrupt */ |
| mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; |
| if ((irb->scsw.dstat & mask) == mask) { |
| device = dasd_device_from_cdev_locked(cdev); |
| if (!IS_ERR(device)) { |
| dasd_handle_state_change_pending(device); |
| dasd_put_device(device); |
| } |
| return; |
| } |
| |
| cqr = (struct dasd_ccw_req *) intparm; |
| |
| /* check for unsolicited interrupts */ |
| if (cqr == NULL) { |
| MESSAGE(KERN_DEBUG, |
| "unsolicited interrupt received: bus_id %s", |
| cdev->dev.bus_id); |
| return; |
| } |
| |
| device = (struct dasd_device *) cqr->device; |
| if (device == NULL || |
| strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
| MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", |
| cdev->dev.bus_id); |
| return; |
| } |
| |
| /* Check for clear pending */ |
| if (cqr->status == DASD_CQR_CLEAR && |
| 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; |
| } |
| |
| /* check status - the request might have been killed by dyn detach */ |
| if (cqr->status != DASD_CQR_IN_IO) { |
| MESSAGE(KERN_DEBUG, |
| "invalid status: bus_id %s, status %02x", |
| cdev->dev.bus_id, cqr->status); |
| return; |
| } |
| DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p", |
| ((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr); |
| |
| /* Find out the appropriate era_action. */ |
| 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 && |
| !irb->esw.esw0.erw.cons) |
| era = dasd_era_none; |
| else if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) |
| era = dasd_era_fatal; /* don't recover this request */ |
| else if (irb->esw.esw0.erw.cons) |
| era = device->discipline->examine_error(cqr, irb); |
| else |
| era = dasd_era_recover; |
| |
| DBF_DEV_EVENT(DBF_DEBUG, device, "era_code %d", era); |
| expires = 0; |
| if (era == dasd_era_none) { |
| cqr->status = DASD_CQR_DONE; |
| cqr->stopclk = now; |
| /* Start first request on queue if possible -> fast_io. */ |
| if (cqr->list.next != &device->ccw_queue) { |
| next = list_entry(cqr->list.next, |
| struct dasd_ccw_req, list); |
| if ((next->status == DASD_CQR_QUEUED) && |
| (!device->stopped)) { |
| if (device->discipline->start_IO(next) == 0) |
| expires = next->expires; |
| else |
| DEV_MESSAGE(KERN_DEBUG, device, "%s", |
| "Interrupt fastpath " |
| "failed!"); |
| } |
| } |
| } else { /* error */ |
| memcpy(&cqr->irb, irb, sizeof (struct irb)); |
| #ifdef ERP_DEBUG |
| /* dump sense data */ |
| dasd_log_sense(cqr, irb); |
| #endif |
| switch (era) { |
| case dasd_era_fatal: |
| cqr->status = DASD_CQR_FAILED; |
| cqr->stopclk = now; |
| break; |
| case dasd_era_recover: |
| cqr->status = DASD_CQR_ERROR; |
| break; |
| default: |
| BUG(); |
| } |
| } |
| if (expires != 0) |
| dasd_set_timer(device, expires); |
| else |
| dasd_clear_timer(device); |
| dasd_schedule_bh(device); |
| } |
| |
| /* |
| * posts the buffer_cache about a finalized request |
| */ |
| static inline void |
| dasd_end_request(struct request *req, int uptodate) |
| { |
| if (end_that_request_first(req, uptodate, req->hard_nr_sectors)) |
| BUG(); |
| add_disk_randomness(req->rq_disk); |
| end_that_request_last(req, uptodate); |
| } |
| |
| /* |
| * Process finished error recovery ccw. |
| */ |
| static inline void |
| __dasd_process_erp(struct dasd_device *device, struct dasd_ccw_req *cqr) |
| { |
| dasd_erp_fn_t erp_fn; |
| |
| if (cqr->status == DASD_CQR_DONE) |
| DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); |
| else |
| DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful"); |
| erp_fn = device->discipline->erp_postaction(cqr); |
| erp_fn(cqr); |
| } |
| |
| /* |
| * Process ccw request queue. |
| */ |
| static inline void |
| __dasd_process_ccw_queue(struct dasd_device * device, |
| struct list_head *final_queue) |
| { |
| struct list_head *l, *n; |
| struct dasd_ccw_req *cqr; |
| dasd_erp_fn_t erp_fn; |
| |
| restart: |
| /* Process request with final status. */ |
| list_for_each_safe(l, n, &device->ccw_queue) { |
| cqr = list_entry(l, struct dasd_ccw_req, list); |
| /* Stop list processing at the first non-final request. */ |
| if (cqr->status != DASD_CQR_DONE && |
| cqr->status != DASD_CQR_FAILED && |
| cqr->status != DASD_CQR_ERROR) |
| break; |
| /* Process requests with DASD_CQR_ERROR */ |
| if (cqr->status == DASD_CQR_ERROR) { |
| if (cqr->irb.scsw.fctl & SCSW_FCTL_HALT_FUNC) { |
| cqr->status = DASD_CQR_FAILED; |
| cqr->stopclk = get_clock(); |
| } else { |
| if (cqr->irb.esw.esw0.erw.cons) { |
| erp_fn = device->discipline-> |
| erp_action(cqr); |
| erp_fn(cqr); |
| } else |
| dasd_default_erp_action(cqr); |
| } |
| goto restart; |
| } |
| |
| /* First of all call extended error reporting. */ |
| if (dasd_eer_enabled(device) && |
| cqr->status == DASD_CQR_FAILED) { |
| dasd_eer_write(device, cqr, DASD_EER_FATALERROR); |
| |
| /* restart request */ |
| cqr->status = DASD_CQR_QUEUED; |
| cqr->retries = 255; |
| device->stopped |= DASD_STOPPED_QUIESCE; |
| goto restart; |
| } |
| |
| /* Process finished ERP request. */ |
| if (cqr->refers) { |
| __dasd_process_erp(device, cqr); |
| goto restart; |
| } |
| |
| /* Rechain finished requests to final queue */ |
| cqr->endclk = get_clock(); |
| list_move_tail(&cqr->list, final_queue); |
| } |
| } |
| |
| static void |
| dasd_end_request_cb(struct dasd_ccw_req * cqr, void *data) |
| { |
| struct request *req; |
| struct dasd_device *device; |
| int status; |
| |
| req = (struct request *) data; |
| device = cqr->device; |
| dasd_profile_end(device, cqr, req); |
| status = cqr->device->discipline->free_cp(cqr,req); |
| spin_lock_irq(&device->request_queue_lock); |
| dasd_end_request(req, status); |
| spin_unlock_irq(&device->request_queue_lock); |
| } |
| |
| |
| /* |
| * Fetch requests from the block device queue. |
| */ |
| static inline void |
| __dasd_process_blk_queue(struct dasd_device * device) |
| { |
| request_queue_t *queue; |
| struct request *req; |
| struct dasd_ccw_req *cqr; |
| int nr_queued; |
| |
| queue = device->request_queue; |
| /* No queue ? Then there is nothing to do. */ |
| if (queue == NULL) |
| return; |
| |
| /* |
| * We requeue request from the block device queue to the ccw |
| * queue only in two states. In state DASD_STATE_READY the |
| * partition detection is done and we need to requeue requests |
| * for that. State DASD_STATE_ONLINE is normal block device |
| * operation. |
| */ |
| if (device->state != DASD_STATE_READY && |
| device->state != DASD_STATE_ONLINE) |
| return; |
| nr_queued = 0; |
| /* Now we try to fetch requests from the request queue */ |
| list_for_each_entry(cqr, &device->ccw_queue, list) |
| if (cqr->status == DASD_CQR_QUEUED) |
| nr_queued++; |
| while (!blk_queue_plugged(queue) && |
| elv_next_request(queue) && |
| nr_queued < DASD_CHANQ_MAX_SIZE) { |
| req = elv_next_request(queue); |
| |
| if (device->features & DASD_FEATURE_READONLY && |
| rq_data_dir(req) == WRITE) { |
| DBF_DEV_EVENT(DBF_ERR, device, |
| "Rejecting write request %p", |
| req); |
| blkdev_dequeue_request(req); |
| dasd_end_request(req, 0); |
| continue; |
| } |
| if (device->stopped & DASD_STOPPED_DC_EIO) { |
| blkdev_dequeue_request(req); |
| dasd_end_request(req, 0); |
| continue; |
| } |
| cqr = device->discipline->build_cp(device, req); |
| if (IS_ERR(cqr)) { |
| if (PTR_ERR(cqr) == -ENOMEM) |
| break; /* terminate request queue loop */ |
| DBF_DEV_EVENT(DBF_ERR, device, |
| "CCW creation failed (rc=%ld) " |
| "on request %p", |
| PTR_ERR(cqr), req); |
| blkdev_dequeue_request(req); |
| dasd_end_request(req, 0); |
| continue; |
| } |
| cqr->callback = dasd_end_request_cb; |
| cqr->callback_data = (void *) req; |
| cqr->status = DASD_CQR_QUEUED; |
| blkdev_dequeue_request(req); |
| list_add_tail(&cqr->list, &device->ccw_queue); |
| dasd_profile_start(device, cqr, req); |
| nr_queued++; |
| } |
| } |
| |
| /* |
| * Take a look at the first request on the ccw queue and check |
| * if it reached its expire time. If so, terminate the IO. |
| */ |
| static inline void |
| __dasd_check_expire(struct dasd_device * device) |
| { |
| struct dasd_ccw_req *cqr; |
| |
| if (list_empty(&device->ccw_queue)) |
| return; |
| cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); |
| if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
| (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { |
| if (device->discipline->term_IO(cqr) != 0) { |
| /* Hmpf, try again in 5 sec */ |
| dasd_set_timer(device, 5*HZ); |
| DEV_MESSAGE(KERN_ERR, device, |
| "internal error - timeout (%is) expired " |
| "for cqr %p, termination failed, " |
| "retrying in 5s", |
| (cqr->expires/HZ), cqr); |
| } else { |
| DEV_MESSAGE(KERN_ERR, device, |
| "internal error - timeout (%is) expired " |
| "for cqr %p (%i retries left)", |
| (cqr->expires/HZ), cqr, cqr->retries); |
| } |
| } |
| } |
| |
| /* |
| * Take a look at the first request on the ccw queue and check |
| * if it needs to be started. |
| */ |
| static inline void |
| __dasd_start_head(struct dasd_device * device) |
| { |
| struct dasd_ccw_req *cqr; |
| int rc; |
| |
| if (list_empty(&device->ccw_queue)) |
| return; |
| cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); |
| if (cqr->status != DASD_CQR_QUEUED) |
| return; |
| /* Non-temporary stop condition will trigger fail fast */ |
| if (device->stopped & ~DASD_STOPPED_PENDING && |
| test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && |
| (!dasd_eer_enabled(device))) { |
| cqr->status = DASD_CQR_FAILED; |
| dasd_schedule_bh(device); |
| return; |
| } |
| /* Don't try to start requests if device is stopped */ |
| if (device->stopped) |
| return; |
| |
| rc = device->discipline->start_IO(cqr); |
| if (rc == 0) |
| dasd_set_timer(device, cqr->expires); |
| else if (rc == -EACCES) { |
| dasd_schedule_bh(device); |
| } else |
| /* Hmpf, try again in 1/2 sec */ |
| dasd_set_timer(device, 50); |
| } |
| |
| static inline int |
| _wait_for_clear(struct dasd_ccw_req *cqr) |
| { |
| return (cqr->status == DASD_CQR_QUEUED); |
| } |
| |
| /* |
| * 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 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; |
| |
| INIT_LIST_HEAD(&flush_queue); |
| spin_lock_irq(get_ccwdev_lock(device->cdev)); |
| 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 && |
| orig->callback != dasd_end_request_cb) { |
| continue; |
| } |
| /* 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); |
| /* restart list_for_xx loop since dasd_process_erp |
| * might remove multiple elements */ |
| goto restart_cb; |
| } |
| /* call the callback function */ |
| cqr->endclk = get_clock(); |
| if (cqr->callback != NULL) |
| (cqr->callback)(cqr, cqr->callback_data); |
| } |
| return rc; |
| } |
| |
| /* |
| * Acquire the device lock and process queues for the device. |
| */ |
| static void |
| dasd_tasklet(struct dasd_device * device) |
| { |
| struct list_head final_queue; |
| struct list_head *l, *n; |
| struct dasd_ccw_req *cqr; |
| |
| atomic_set (&device->tasklet_scheduled, 0); |
| INIT_LIST_HEAD(&final_queue); |
| spin_lock_irq(get_ccwdev_lock(device->cdev)); |
| /* Check expire time of first request on the ccw queue. */ |
| __dasd_check_expire(device); |
| /* Finish off requests on ccw queue */ |
| __dasd_process_ccw_queue(device, &final_queue); |
| spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
| /* Now call the callback function of requests with final status */ |
| list_for_each_safe(l, n, &final_queue) { |
| cqr = list_entry(l, struct dasd_ccw_req, list); |
| list_del_init(&cqr->list); |
| if (cqr->callback != NULL) |
| (cqr->callback)(cqr, cqr->callback_data); |
| } |
| spin_lock_irq(&device->request_queue_lock); |
| spin_lock(get_ccwdev_lock(device->cdev)); |
| /* Get new request from the block device request queue */ |
| __dasd_process_blk_queue(device); |
| /* Now check if the head of the ccw queue needs to be started. */ |
| __dasd_start_head(device); |
| spin_unlock(get_ccwdev_lock(device->cdev)); |
| spin_unlock_irq(&device->request_queue_lock); |
| dasd_put_device(device); |
| } |
| |
| /* |
| * Schedules a call to dasd_tasklet over the device tasklet. |
| */ |
| void |
| dasd_schedule_bh(struct dasd_device * device) |
| { |
| /* Protect against rescheduling. */ |
| if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
| return; |
| dasd_get_device(device); |
| tasklet_hi_schedule(&device->tasklet); |
| } |
| |
| /* |
| * Queue a request to the head of the ccw_queue. Start the I/O if |
| * possible. |
| */ |
| void |
| dasd_add_request_head(struct dasd_ccw_req *req) |
| { |
| struct dasd_device *device; |
| unsigned long flags; |
| |
| device = req->device; |
| spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
| req->status = DASD_CQR_QUEUED; |
| req->device = device; |
| list_add(&req->list, &device->ccw_queue); |
| /* let the bh start the request to keep them in order */ |
| dasd_schedule_bh(device); |
| spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| } |
| |
| /* |
| * Queue a request to the tail of the ccw_queue. Start the I/O if |
| * possible. |
| */ |
| void |
| dasd_add_request_tail(struct dasd_ccw_req *req) |
| { |
| struct dasd_device *device; |
| unsigned long flags; |
| |
| device = req->device; |
| spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
| req->status = DASD_CQR_QUEUED; |
| req->device = device; |
| list_add_tail(&req->list, &device->ccw_queue); |
| /* let the bh start the request to keep them in order */ |
| dasd_schedule_bh(device); |
| spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| } |
| |
| /* |
| * Wakeup callback. |
| */ |
| static void |
| dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
| { |
| wake_up((wait_queue_head_t *) data); |
| } |
| |
| static inline int |
| _wait_for_wakeup(struct dasd_ccw_req *cqr) |
| { |
| struct dasd_device *device; |
| int rc; |
| |
| device = cqr->device; |
| spin_lock_irq(get_ccwdev_lock(device->cdev)); |
| rc = ((cqr->status == DASD_CQR_DONE || |
| cqr->status == DASD_CQR_FAILED) && |
| list_empty(&cqr->list)); |
| spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
| return rc; |
| } |
| |
| /* |
| * Attempts to start a special ccw queue and waits for its completion. |
| */ |
| int |
| 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; |
| } |
| |
| /* |
| * Attempts to start a special ccw queue and wait interruptible |
| * for its completion. |
| */ |
| int |
| dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr) |
| { |
| wait_queue_head_t wait_q; |
| struct dasd_device *device; |
| int rc, finished; |
| |
| 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)); |
| |
| finished = 0; |
| while (!finished) { |
| rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr)); |
| if (rc != -ERESTARTSYS) { |
| /* Request is final (done or failed) */ |
| rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
| break; |
| } |
| spin_lock_irq(get_ccwdev_lock(device->cdev)); |
| switch (cqr->status) { |
| case DASD_CQR_IN_IO: |
| /* terminate runnig cqr */ |
| if (device->discipline->term_IO) { |
| cqr->retries = -1; |
| device->discipline->term_IO(cqr); |
| /* 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)); |
| rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
| finished = 1; |
| } |
| break; |
| case DASD_CQR_QUEUED: |
| /* request */ |
| list_del_init(&cqr->list); |
| rc = -EIO; |
| finished = 1; |
| break; |
| default: |
| /* cqr with 'non-interruptable' status - just wait */ |
| break; |
| } |
| spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
| } |
| return rc; |
| } |
| |
| /* |
| * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock |
| * for eckd devices) the currently running request has to be terminated |
| * and be put back to status queued, before the special request is added |
| * to the head of the queue. Then the special request is waited on normally. |
| */ |
| static inline int |
| _dasd_term_running_cqr(struct dasd_device *device) |
| { |
| struct dasd_ccw_req *cqr; |
| |
| if (list_empty(&device->ccw_queue)) |
| return 0; |
| cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); |
| return device->discipline->term_IO(cqr); |
| } |
| |
| int |
| 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); |
| if (rc) { |
| 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; |
| } |
| |
| /* |
| * Cancels a request that was started with dasd_sleep_on_req. |
| * This is useful to timeout requests. The request will be |
| * terminated if it is currently in i/o. |
| * Returns 1 if the request has been terminated. |
| */ |
| int |
| dasd_cancel_req(struct dasd_ccw_req *cqr) |
| { |
| struct dasd_device *device = cqr->device; |
| unsigned long flags; |
| int rc; |
| |
| rc = 0; |
| spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
| switch (cqr->status) { |
| case DASD_CQR_QUEUED: |
| /* request was not started - just set to failed */ |
| cqr->status = DASD_CQR_FAILED; |
| break; |
| case DASD_CQR_IN_IO: |
| /* request in IO - terminate IO and release again */ |
| if (device->discipline->term_IO(cqr) != 0) |
| /* what to do if unable to terminate ?????? |
| e.g. not _IN_IO */ |
| cqr->status = DASD_CQR_FAILED; |
| cqr->stopclk = get_clock(); |
| rc = 1; |
| break; |
| case DASD_CQR_DONE: |
| case DASD_CQR_FAILED: |
| /* already finished - do nothing */ |
| break; |
| default: |
| DEV_MESSAGE(KERN_ALERT, device, |
| "invalid status %02x in request", |
| cqr->status); |
| BUG(); |
| |
| } |
| spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| dasd_schedule_bh(device); |
| return rc; |
| } |
| |
| /* |
| * SECTION: Block device operations (request queue, partitions, open, release). |
| */ |
| |
| /* |
| * Dasd request queue function. Called from ll_rw_blk.c |
| */ |
| static void |
| do_dasd_request(request_queue_t * queue) |
| { |
| struct dasd_device *device; |
| |
| device = (struct dasd_device *) queue->queuedata; |
| spin_lock(get_ccwdev_lock(device->cdev)); |
| /* Get new request from the block device request queue */ |
| __dasd_process_blk_queue(device); |
| /* Now check if the head of the ccw queue needs to be started. */ |
| __dasd_start_head(device); |
| spin_unlock(get_ccwdev_lock(device->cdev)); |
| } |
| |
| /* |
| * Allocate and initialize request queue and default I/O scheduler. |
| */ |
| static int |
| dasd_alloc_queue(struct dasd_device * device) |
| { |
| int rc; |
| |
| device->request_queue = blk_init_queue(do_dasd_request, |
| &device->request_queue_lock); |
| if (device->request_queue == NULL) |
| return -ENOMEM; |
| |
| device->request_queue->queuedata = device; |
| |
| elevator_exit(device->request_queue->elevator); |
| rc = elevator_init(device->request_queue, "deadline"); |
| if (rc) { |
| blk_cleanup_queue(device->request_queue); |
| return rc; |
| } |
| return 0; |
| } |
| |
| /* |
| * Allocate and initialize request queue. |
| */ |
| static void |
| dasd_setup_queue(struct dasd_device * device) |
| { |
| int max; |
| |
| blk_queue_hardsect_size(device->request_queue, device->bp_block); |
| max = device->discipline->max_blocks << device->s2b_shift; |
| blk_queue_max_sectors(device->request_queue, max); |
| blk_queue_max_phys_segments(device->request_queue, -1L); |
| blk_queue_max_hw_segments(device->request_queue, -1L); |
| blk_queue_max_segment_size(device->request_queue, -1L); |
| blk_queue_segment_boundary(device->request_queue, -1L); |
| blk_queue_ordered(device->request_queue, QUEUE_ORDERED_TAG, NULL); |
| } |
| |
| /* |
| * Deactivate and free request queue. |
| */ |
| static void |
| dasd_free_queue(struct dasd_device * device) |
| { |
| if (device->request_queue) { |
| blk_cleanup_queue(device->request_queue); |
| device->request_queue = NULL; |
| } |
| } |
| |
| /* |
| * Flush request on the request queue. |
| */ |
| static void |
| dasd_flush_request_queue(struct dasd_device * device) |
| { |
| struct request *req; |
| |
| if (!device->request_queue) |
| return; |
| |
| spin_lock_irq(&device->request_queue_lock); |
| while ((req = elv_next_request(device->request_queue))) { |
| blkdev_dequeue_request(req); |
| dasd_end_request(req, 0); |
| } |
| spin_unlock_irq(&device->request_queue_lock); |
| } |
| |
| static int |
| dasd_open(struct inode *inp, struct file *filp) |
| { |
| struct gendisk *disk = inp->i_bdev->bd_disk; |
| struct dasd_device *device = disk->private_data; |
| int rc; |
| |
| atomic_inc(&device->open_count); |
| if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { |
| rc = -ENODEV; |
| goto unlock; |
| } |
| |
| if (!try_module_get(device->discipline->owner)) { |
| rc = -EINVAL; |
| goto unlock; |
| } |
| |
| if (dasd_probeonly) { |
| DEV_MESSAGE(KERN_INFO, device, "%s", |
| "No access to device due to probeonly mode"); |
| rc = -EPERM; |
| goto out; |
| } |
| |
| if (device->state <= DASD_STATE_BASIC) { |
| DBF_DEV_EVENT(DBF_ERR, device, " %s", |
| " Cannot open unrecognized device"); |
| rc = -ENODEV; |
| goto out; |
| } |
| |
| return 0; |
| |
| out: |
| module_put(device->discipline->owner); |
| unlock: |
| atomic_dec(&device->open_count); |
| return rc; |
| } |
| |
| static int |
| dasd_release(struct inode *inp, struct file *filp) |
| { |
| struct gendisk *disk = inp->i_bdev->bd_disk; |
| struct dasd_device *device = disk->private_data; |
| |
| atomic_dec(&device->open_count); |
| module_put(device->discipline->owner); |
| return 0; |
| } |
| |
| /* |
| * Return disk geometry. |
| */ |
| static int |
| dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| { |
| struct dasd_device *device; |
| |
| device = bdev->bd_disk->private_data; |
| if (!device) |
| return -ENODEV; |
| |
| if (!device->discipline || |
| !device->discipline->fill_geometry) |
| return -EINVAL; |
| |
| device->discipline->fill_geometry(device, geo); |
| geo->start = get_start_sect(bdev) >> device->s2b_shift; |
| return 0; |
| } |
| |
| struct block_device_operations |
| dasd_device_operations = { |
| .owner = THIS_MODULE, |
| .open = dasd_open, |
| .release = dasd_release, |
| .ioctl = dasd_ioctl, |
| .compat_ioctl = dasd_compat_ioctl, |
| .getgeo = dasd_getgeo, |
| }; |
| |
| |
| static void |
| dasd_exit(void) |
| { |
| #ifdef CONFIG_PROC_FS |
| dasd_proc_exit(); |
| #endif |
| dasd_eer_exit(); |
| if (dasd_page_cache != NULL) { |
| kmem_cache_destroy(dasd_page_cache); |
| dasd_page_cache = NULL; |
| } |
| dasd_gendisk_exit(); |
| dasd_devmap_exit(); |
| if (dasd_debug_area != NULL) { |
| debug_unregister(dasd_debug_area); |
| dasd_debug_area = NULL; |
| } |
| } |
| |
| /* |
| * SECTION: common functions for ccw_driver use |
| */ |
| |
| /* |
| * Initial attempt at a probe function. this can be simplified once |
| * the other detection code is gone. |
| */ |
| int |
| dasd_generic_probe (struct ccw_device *cdev, |
| struct dasd_discipline *discipline) |
| { |
| 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); |
| 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; |
| } |
| |
| /* |
| * This will one day be called from a global not_oper handler. |
| * It is also used by driver_unregister during module unload. |
| */ |
| void |
| dasd_generic_remove (struct ccw_device *cdev) |
| { |
| struct dasd_device *device; |
| |
| cdev->handler = NULL; |
| |
| dasd_remove_sysfs_files(cdev); |
| device = dasd_device_from_cdev(cdev); |
| if (IS_ERR(device)) |
| return; |
| if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { |
| /* Already doing offline processing */ |
| dasd_put_device(device); |
| return; |
| } |
| /* |
| * This device is removed unconditionally. Set offline |
| * flag to prevent dasd_open from opening it while it is |
| * no quite down yet. |
| */ |
| dasd_set_target_state(device, DASD_STATE_NEW); |
| /* dasd_delete_device destroys the device reference. */ |
| dasd_delete_device(device); |
| } |
| |
| /* |
| * Activate a device. This is called from dasd_{eckd,fba}_probe() when either |
| * the device is detected for the first time and is supposed to be used |
| * or the user has started activation through sysfs. |
| */ |
| int |
| dasd_generic_set_online (struct ccw_device *cdev, |
| struct dasd_discipline *base_discipline) |
| |
| { |
| struct dasd_discipline *discipline; |
| 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); |
| |
| discipline = base_discipline; |
| if (device->features & DASD_FEATURE_USEDIAG) { |
| if (!dasd_diag_discipline_pointer) { |
| printk (KERN_WARNING |
| "dasd_generic couldn't online device %s " |
| "- discipline DIAG not available\n", |
| cdev->dev.bus_id); |
| dasd_delete_device(device); |
| return -ENODEV; |
| } |
| discipline = dasd_diag_discipline_pointer; |
| } |
| if (!try_module_get(base_discipline->owner)) { |
| dasd_delete_device(device); |
| return -EINVAL; |
| } |
| if (!try_module_get(discipline->owner)) { |
| module_put(base_discipline->owner); |
| dasd_delete_device(device); |
| return -EINVAL; |
| } |
| device->base_discipline = base_discipline; |
| device->discipline = discipline; |
| |
| rc = discipline->check_device(device); |
| if (rc) { |
| printk (KERN_WARNING |
| "dasd_generic couldn't online device %s " |
| "with discipline %s rc=%i\n", |
| cdev->dev.bus_id, discipline->name, rc); |
| module_put(discipline->owner); |
| module_put(base_discipline->owner); |
| dasd_delete_device(device); |
| return rc; |
| } |
| |
| dasd_set_target_state(device, DASD_STATE_ONLINE); |
| if (device->state <= DASD_STATE_KNOWN) { |
| printk (KERN_WARNING |
| "dasd_generic discipline not found for %s\n", |
| cdev->dev.bus_id); |
| rc = -ENODEV; |
| dasd_set_target_state(device, DASD_STATE_NEW); |
| dasd_delete_device(device); |
| } else |
| pr_debug("dasd_generic device %s found\n", |
| cdev->dev.bus_id); |
| |
| /* FIXME: we have to wait for the root device but we don't want |
| * to wait for each single device but for all at once. */ |
| wait_event(dasd_init_waitq, _wait_for_device(device)); |
| |
| dasd_put_device(device); |
| |
| return rc; |
| } |
| |
| int |
| dasd_generic_set_offline (struct ccw_device *cdev) |
| { |
| struct dasd_device *device; |
| int max_count, open_count; |
| |
| device = dasd_device_from_cdev(cdev); |
| if (IS_ERR(device)) |
| return PTR_ERR(device); |
| if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { |
| /* Already doing offline processing */ |
| dasd_put_device(device); |
| return 0; |
| } |
| /* |
| * We must make sure that this device is currently not in use. |
| * The open_count is increased for every opener, that includes |
| * the blkdev_get in dasd_scan_partitions. We are only interested |
| * in the other openers. |
| */ |
| max_count = device->bdev ? 0 : -1; |
| open_count = (int) atomic_read(&device->open_count); |
| if (open_count > max_count) { |
| if (open_count > 0) |
| printk (KERN_WARNING "Can't offline dasd device with " |
| "open count = %i.\n", |
| open_count); |
| else |
| printk (KERN_WARNING "%s", |
| "Can't offline dasd device due to internal " |
| "use\n"); |
| clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
| dasd_put_device(device); |
| return -EBUSY; |
| } |
| dasd_set_target_state(device, DASD_STATE_NEW); |
| /* dasd_delete_device destroys the device reference. */ |
| dasd_delete_device(device); |
| |
| return 0; |
| } |
| |
| int |
| dasd_generic_notify(struct ccw_device *cdev, int event) |
| { |
| struct dasd_device *device; |
| struct dasd_ccw_req *cqr; |
| unsigned long flags; |
| int ret; |
| |
| device = dasd_device_from_cdev(cdev); |
| if (IS_ERR(device)) |
| return 0; |
| spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
| ret = 0; |
| switch (event) { |
| case CIO_GONE: |
| case CIO_NO_PATH: |
| /* First of all call extended error reporting. */ |
| dasd_eer_write(device, NULL, DASD_EER_NOPATH); |
| |
| if (device->state < DASD_STATE_BASIC) |
| break; |
| /* Device is active. We want to keep it. */ |
| if (test_bit(DASD_FLAG_DSC_ERROR, &device->flags)) { |
| list_for_each_entry(cqr, &device->ccw_queue, list) |
| if (cqr->status == DASD_CQR_IN_IO) |
| cqr->status = DASD_CQR_FAILED; |
| device->stopped |= DASD_STOPPED_DC_EIO; |
| } else { |
| list_for_each_entry(cqr, &device->ccw_queue, list) |
| if (cqr->status == DASD_CQR_IN_IO) { |
| cqr->status = DASD_CQR_QUEUED; |
| cqr->retries++; |
| } |
| device->stopped |= DASD_STOPPED_DC_WAIT; |
| dasd_set_timer(device, 0); |
| } |
| dasd_schedule_bh(device); |
| ret = 1; |
| break; |
| case CIO_OPER: |
| /* FIXME: add a sanity check. */ |
| device->stopped &= ~(DASD_STOPPED_DC_WAIT|DASD_STOPPED_DC_EIO); |
| dasd_schedule_bh(device); |
| ret = 1; |
| break; |
| } |
| spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| dasd_put_device(device); |
| return ret; |
| } |
| |
| |
| static int __init |
| 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)); |
| if (dasd_debug_area == NULL) { |
| rc = -ENOMEM; |
| goto failed; |
| } |
| debug_register_view(dasd_debug_area, &debug_sprintf_view); |
| debug_set_level(dasd_debug_area, DBF_WARNING); |
| |
| DBF_EVENT(DBF_EMERG, "%s", "debug area created"); |
| |
| dasd_diag_discipline_pointer = NULL; |
| |
| rc = dasd_devmap_init(); |
| if (rc) |
| goto failed; |
| rc = dasd_gendisk_init(); |
| if (rc) |
| goto failed; |
| rc = dasd_parse(); |
| if (rc) |
| goto failed; |
| rc = dasd_eer_init(); |
| if (rc) |
| goto failed; |
| #ifdef CONFIG_PROC_FS |
| rc = dasd_proc_init(); |
| if (rc) |
| goto failed; |
| #endif |
| |
| return 0; |
| failed: |
| MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors"); |
| dasd_exit(); |
| return rc; |
| } |
| |
| module_init(dasd_init); |
| module_exit(dasd_exit); |
| |
| EXPORT_SYMBOL(dasd_debug_area); |
| EXPORT_SYMBOL(dasd_diag_discipline_pointer); |
| |
| EXPORT_SYMBOL(dasd_add_request_head); |
| EXPORT_SYMBOL(dasd_add_request_tail); |
| EXPORT_SYMBOL(dasd_cancel_req); |
| EXPORT_SYMBOL(dasd_clear_timer); |
| EXPORT_SYMBOL(dasd_enable_device); |
| EXPORT_SYMBOL(dasd_int_handler); |
| EXPORT_SYMBOL(dasd_kfree_request); |
| EXPORT_SYMBOL(dasd_kick_device); |
| EXPORT_SYMBOL(dasd_kmalloc_request); |
| EXPORT_SYMBOL(dasd_schedule_bh); |
| EXPORT_SYMBOL(dasd_set_target_state); |
| EXPORT_SYMBOL(dasd_set_timer); |
| EXPORT_SYMBOL(dasd_sfree_request); |
| EXPORT_SYMBOL(dasd_sleep_on); |
| EXPORT_SYMBOL(dasd_sleep_on_immediatly); |
| EXPORT_SYMBOL(dasd_sleep_on_interruptible); |
| EXPORT_SYMBOL(dasd_smalloc_request); |
| EXPORT_SYMBOL(dasd_start_IO); |
| EXPORT_SYMBOL(dasd_term_IO); |
| |
| EXPORT_SYMBOL_GPL(dasd_generic_probe); |
| 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); |
| |