| /* |
| * 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> |
| * Copyright IBM Corp. 1999, 2009 |
| */ |
| |
| #define KMSG_COMPONENT "dasd" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #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/hdreg.h> |
| #include <linux/async.h> |
| #include <linux/mutex.h> |
| #include <linux/debugfs.h> |
| #include <linux/seq_file.h> |
| #include <linux/vmalloc.h> |
| |
| #include <asm/ccwdev.h> |
| #include <asm/ebcdic.h> |
| #include <asm/idals.h> |
| #include <asm/itcw.h> |
| #include <asm/diag.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; |
| EXPORT_SYMBOL(dasd_debug_area); |
| static struct dentry *dasd_debugfs_root_entry; |
| struct dasd_discipline *dasd_diag_discipline_pointer; |
| EXPORT_SYMBOL(dasd_diag_discipline_pointer); |
| void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
| |
| MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); |
| MODULE_DESCRIPTION("Linux on S/390 DASD device driver," |
| " Copyright IBM Corp. 2000"); |
| MODULE_SUPPORTED_DEVICE("dasd"); |
| MODULE_LICENSE("GPL"); |
| |
| /* |
| * SECTION: prototypes for static functions of dasd.c |
| */ |
| static int dasd_alloc_queue(struct dasd_block *); |
| static void dasd_setup_queue(struct dasd_block *); |
| static void dasd_free_queue(struct dasd_block *); |
| static void dasd_flush_request_queue(struct dasd_block *); |
| static int dasd_flush_block_queue(struct dasd_block *); |
| static void dasd_device_tasklet(struct dasd_device *); |
| static void dasd_block_tasklet(struct dasd_block *); |
| static void do_kick_device(struct work_struct *); |
| static void do_restore_device(struct work_struct *); |
| static void do_reload_device(struct work_struct *); |
| static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
| static void dasd_device_timeout(unsigned long); |
| static void dasd_block_timeout(unsigned long); |
| static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *); |
| static void dasd_profile_init(struct dasd_profile *, struct dentry *); |
| static void dasd_profile_exit(struct dasd_profile *); |
| |
| /* |
| * SECTION: Operations on the device structure. |
| */ |
| static wait_queue_head_t dasd_init_waitq; |
| static wait_queue_head_t dasd_flush_wq; |
| static wait_queue_head_t generic_waitq; |
| static wait_queue_head_t shutdown_waitq; |
| |
| /* |
| * 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) |
| return ERR_PTR(-ENOMEM); |
| |
| /* Get two pages for normal block device operations. */ |
| device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); |
| if (!device->ccw_mem) { |
| 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) { |
| 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); |
| atomic_set(&device->tasklet_scheduled, 0); |
| tasklet_init(&device->tasklet, |
| (void (*)(unsigned long)) dasd_device_tasklet, |
| (unsigned long) device); |
| INIT_LIST_HEAD(&device->ccw_queue); |
| init_timer(&device->timer); |
| device->timer.function = dasd_device_timeout; |
| device->timer.data = (unsigned long) device; |
| INIT_WORK(&device->kick_work, do_kick_device); |
| INIT_WORK(&device->restore_device, do_restore_device); |
| INIT_WORK(&device->reload_device, do_reload_device); |
| device->state = DASD_STATE_NEW; |
| device->target = DASD_STATE_NEW; |
| mutex_init(&device->state_mutex); |
| spin_lock_init(&device->profile.lock); |
| 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); |
| } |
| |
| /* |
| * Allocate memory for a new device structure. |
| */ |
| struct dasd_block *dasd_alloc_block(void) |
| { |
| struct dasd_block *block; |
| |
| block = kzalloc(sizeof(*block), GFP_ATOMIC); |
| if (!block) |
| return ERR_PTR(-ENOMEM); |
| /* open_count = 0 means device online but not in use */ |
| atomic_set(&block->open_count, -1); |
| |
| spin_lock_init(&block->request_queue_lock); |
| atomic_set(&block->tasklet_scheduled, 0); |
| tasklet_init(&block->tasklet, |
| (void (*)(unsigned long)) dasd_block_tasklet, |
| (unsigned long) block); |
| INIT_LIST_HEAD(&block->ccw_queue); |
| spin_lock_init(&block->queue_lock); |
| init_timer(&block->timer); |
| block->timer.function = dasd_block_timeout; |
| block->timer.data = (unsigned long) block; |
| spin_lock_init(&block->profile.lock); |
| |
| return block; |
| } |
| EXPORT_SYMBOL_GPL(dasd_alloc_block); |
| |
| /* |
| * Free memory of a device structure. |
| */ |
| void dasd_free_block(struct dasd_block *block) |
| { |
| kfree(block); |
| } |
| EXPORT_SYMBOL_GPL(dasd_free_block); |
| |
| /* |
| * 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); |
| |
| if (device->block) { |
| rc = dasd_alloc_queue(device->block); |
| 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) { |
| if (device->discipline->uncheck_device) |
| device->discipline->uncheck_device(device); |
| 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; |
| |
| if (device->block) |
| dasd_free_queue(device->block); |
| |
| /* Give up reference we took in dasd_state_new_to_known. */ |
| dasd_put_device(device); |
| return 0; |
| } |
| |
| static struct dentry *dasd_debugfs_setup(const char *name, |
| struct dentry *base_dentry) |
| { |
| struct dentry *pde; |
| |
| if (!base_dentry) |
| return NULL; |
| pde = debugfs_create_dir(name, base_dentry); |
| if (!pde || IS_ERR(pde)) |
| return NULL; |
| return pde; |
| } |
| |
| /* |
| * Request the irq line for the device. |
| */ |
| static int dasd_state_known_to_basic(struct dasd_device *device) |
| { |
| struct dasd_block *block = device->block; |
| int rc = 0; |
| |
| /* Allocate and register gendisk structure. */ |
| if (block) { |
| rc = dasd_gendisk_alloc(block); |
| if (rc) |
| return rc; |
| block->debugfs_dentry = |
| dasd_debugfs_setup(block->gdp->disk_name, |
| dasd_debugfs_root_entry); |
| dasd_profile_init(&block->profile, block->debugfs_dentry); |
| if (dasd_global_profile_level == DASD_PROFILE_ON) |
| dasd_profile_on(&device->block->profile); |
| } |
| device->debugfs_dentry = |
| dasd_debugfs_setup(dev_name(&device->cdev->dev), |
| dasd_debugfs_root_entry); |
| dasd_profile_init(&device->profile, device->debugfs_dentry); |
| |
| /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
| device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, |
| 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 rc; |
| } |
| |
| /* |
| * 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; |
| |
| if (device->block) { |
| dasd_profile_exit(&device->block->profile); |
| debugfs_remove(device->block->debugfs_dentry); |
| dasd_gendisk_free(device->block); |
| dasd_block_clear_timer(device->block); |
| } |
| rc = dasd_flush_device_queue(device); |
| if (rc) |
| return rc; |
| dasd_device_clear_timer(device); |
| dasd_profile_exit(&device->profile); |
| debugfs_remove(device->debugfs_dentry); |
| 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; |
| struct dasd_block *block; |
| |
| rc = 0; |
| block = device->block; |
| /* make disk known with correct capacity */ |
| if (block) { |
| if (block->base->discipline->do_analysis != NULL) |
| rc = block->base->discipline->do_analysis(block); |
| if (rc) { |
| if (rc != -EAGAIN) { |
| device->state = DASD_STATE_UNFMT; |
| goto out; |
| } |
| return rc; |
| } |
| dasd_setup_queue(block); |
| set_capacity(block->gdp, |
| block->blocks << block->s2b_shift); |
| device->state = DASD_STATE_READY; |
| rc = dasd_scan_partitions(block); |
| if (rc) { |
| device->state = DASD_STATE_BASIC; |
| return rc; |
| } |
| } else { |
| device->state = DASD_STATE_READY; |
| } |
| out: |
| if (device->discipline->basic_to_ready) |
| rc = device->discipline->basic_to_ready(device); |
| return rc; |
| } |
| |
| static inline |
| int _wait_for_empty_queues(struct dasd_device *device) |
| { |
| if (device->block) |
| return list_empty(&device->ccw_queue) && |
| list_empty(&device->block->ccw_queue); |
| else |
| return list_empty(&device->ccw_queue); |
| } |
| |
| /* |
| * 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; |
| |
| if (device->discipline->ready_to_basic) { |
| rc = device->discipline->ready_to_basic(device); |
| if (rc) |
| return rc; |
| } |
| device->state = DASD_STATE_BASIC; |
| if (device->block) { |
| struct dasd_block *block = device->block; |
| rc = dasd_flush_block_queue(block); |
| if (rc) { |
| device->state = DASD_STATE_READY; |
| return rc; |
| } |
| dasd_flush_request_queue(block); |
| dasd_destroy_partitions(block); |
| block->blocks = 0; |
| block->bp_block = 0; |
| block->s2b_shift = 0; |
| } |
| 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) |
| { |
| struct gendisk *disk; |
| struct disk_part_iter piter; |
| struct hd_struct *part; |
| |
| device->state = DASD_STATE_ONLINE; |
| if (device->block) { |
| dasd_schedule_block_bh(device->block); |
| if ((device->features & DASD_FEATURE_USERAW)) { |
| disk = device->block->gdp; |
| kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); |
| return 0; |
| } |
| disk = device->block->bdev->bd_disk; |
| disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); |
| while ((part = disk_part_iter_next(&piter))) |
| kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); |
| disk_part_iter_exit(&piter); |
| } |
| return 0; |
| } |
| |
| /* |
| * Stop the requeueing of requests again. |
| */ |
| static int dasd_state_online_to_ready(struct dasd_device *device) |
| { |
| int rc; |
| struct gendisk *disk; |
| struct disk_part_iter piter; |
| struct hd_struct *part; |
| |
| if (device->discipline->online_to_ready) { |
| rc = device->discipline->online_to_ready(device); |
| if (rc) |
| return rc; |
| } |
| |
| device->state = DASD_STATE_READY; |
| if (device->block && !(device->features & DASD_FEATURE_USERAW)) { |
| disk = device->block->bdev->bd_disk; |
| disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); |
| while ((part = disk_part_iter_next(&piter))) |
| kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); |
| disk_part_iter_exit(&piter); |
| } |
| 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 == -EAGAIN) |
| return; |
| if (rc) |
| device->target = device->state; |
| |
| /* let user-space know that the device status changed */ |
| kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); |
| |
| 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); |
| mutex_lock(&device->state_mutex); |
| dasd_change_state(device); |
| mutex_unlock(&device->state_mutex); |
| dasd_schedule_device_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); |
| } |
| EXPORT_SYMBOL(dasd_kick_device); |
| |
| /* |
| * dasd_reload_device will schedule a call do do_reload_device to the kernel |
| * event daemon. |
| */ |
| static void do_reload_device(struct work_struct *work) |
| { |
| struct dasd_device *device = container_of(work, struct dasd_device, |
| reload_device); |
| device->discipline->reload(device); |
| dasd_put_device(device); |
| } |
| |
| void dasd_reload_device(struct dasd_device *device) |
| { |
| dasd_get_device(device); |
| /* queue call to dasd_reload_device to the kernel event daemon. */ |
| schedule_work(&device->reload_device); |
| } |
| EXPORT_SYMBOL(dasd_reload_device); |
| |
| /* |
| * dasd_restore_device will schedule a call do do_restore_device to the kernel |
| * event daemon. |
| */ |
| static void do_restore_device(struct work_struct *work) |
| { |
| struct dasd_device *device = container_of(work, struct dasd_device, |
| restore_device); |
| device->cdev->drv->restore(device->cdev); |
| dasd_put_device(device); |
| } |
| |
| void dasd_restore_device(struct dasd_device *device) |
| { |
| dasd_get_device(device); |
| /* queue call to dasd_restore_device to the kernel event daemon. */ |
| schedule_work(&device->restore_device); |
| } |
| |
| /* |
| * Set the target state for a device and starts the state change. |
| */ |
| void dasd_set_target_state(struct dasd_device *device, int target) |
| { |
| dasd_get_device(device); |
| mutex_lock(&device->state_mutex); |
| /* 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); |
| mutex_unlock(&device->state_mutex); |
| dasd_put_device(device); |
| } |
| EXPORT_SYMBOL(dasd_set_target_state); |
| |
| /* |
| * 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)); |
| |
| dasd_reload_device(device); |
| if (device->discipline->kick_validate) |
| device->discipline->kick_validate(device); |
| } |
| EXPORT_SYMBOL(dasd_enable_device); |
| |
| /* |
| * SECTION: device operation (interrupt handler, start i/o, term i/o ...) |
| */ |
| |
| unsigned int dasd_global_profile_level = DASD_PROFILE_OFF; |
| |
| #ifdef CONFIG_DASD_PROFILE |
| struct dasd_profile_info dasd_global_profile_data; |
| static struct dentry *dasd_global_profile_dentry; |
| static struct dentry *dasd_debugfs_global_entry; |
| |
| /* |
| * Add profiling information for cqr before execution. |
| */ |
| static void dasd_profile_start(struct dasd_block *block, |
| struct dasd_ccw_req *cqr, |
| struct request *req) |
| { |
| struct list_head *l; |
| unsigned int counter; |
| struct dasd_device *device; |
| |
| /* count the length of the chanq for statistics */ |
| counter = 0; |
| if (dasd_global_profile_level || block->profile.data) |
| list_for_each(l, &block->ccw_queue) |
| if (++counter >= 31) |
| break; |
| |
| if (dasd_global_profile_level) { |
| dasd_global_profile_data.dasd_io_nr_req[counter]++; |
| if (rq_data_dir(req) == READ) |
| dasd_global_profile_data.dasd_read_nr_req[counter]++; |
| } |
| |
| spin_lock(&block->profile.lock); |
| if (block->profile.data) { |
| block->profile.data->dasd_io_nr_req[counter]++; |
| if (rq_data_dir(req) == READ) |
| block->profile.data->dasd_read_nr_req[counter]++; |
| } |
| spin_unlock(&block->profile.lock); |
| |
| /* |
| * We count the request for the start device, even though it may run on |
| * some other device due to error recovery. This way we make sure that |
| * we count each request only once. |
| */ |
| device = cqr->startdev; |
| if (device->profile.data) { |
| counter = 1; /* request is not yet queued on the start device */ |
| list_for_each(l, &device->ccw_queue) |
| if (++counter >= 31) |
| break; |
| } |
| spin_lock(&device->profile.lock); |
| if (device->profile.data) { |
| device->profile.data->dasd_io_nr_req[counter]++; |
| if (rq_data_dir(req) == READ) |
| device->profile.data->dasd_read_nr_req[counter]++; |
| } |
| spin_unlock(&device->profile.lock); |
| } |
| |
| /* |
| * Add profiling information for cqr after execution. |
| */ |
| |
| #define dasd_profile_counter(value, index) \ |
| { \ |
| for (index = 0; index < 31 && value >> (2+index); index++) \ |
| ; \ |
| } |
| |
| static void dasd_profile_end_add_data(struct dasd_profile_info *data, |
| int is_alias, |
| int is_tpm, |
| int is_read, |
| long sectors, |
| int sectors_ind, |
| int tottime_ind, |
| int tottimeps_ind, |
| int strtime_ind, |
| int irqtime_ind, |
| int irqtimeps_ind, |
| int endtime_ind) |
| { |
| /* in case of an overflow, reset the whole profile */ |
| if (data->dasd_io_reqs == UINT_MAX) { |
| memset(data, 0, sizeof(*data)); |
| getnstimeofday(&data->starttod); |
| } |
| data->dasd_io_reqs++; |
| data->dasd_io_sects += sectors; |
| if (is_alias) |
| data->dasd_io_alias++; |
| if (is_tpm) |
| data->dasd_io_tpm++; |
| |
| data->dasd_io_secs[sectors_ind]++; |
| data->dasd_io_times[tottime_ind]++; |
| data->dasd_io_timps[tottimeps_ind]++; |
| data->dasd_io_time1[strtime_ind]++; |
| data->dasd_io_time2[irqtime_ind]++; |
| data->dasd_io_time2ps[irqtimeps_ind]++; |
| data->dasd_io_time3[endtime_ind]++; |
| |
| if (is_read) { |
| data->dasd_read_reqs++; |
| data->dasd_read_sects += sectors; |
| if (is_alias) |
| data->dasd_read_alias++; |
| if (is_tpm) |
| data->dasd_read_tpm++; |
| data->dasd_read_secs[sectors_ind]++; |
| data->dasd_read_times[tottime_ind]++; |
| data->dasd_read_time1[strtime_ind]++; |
| data->dasd_read_time2[irqtime_ind]++; |
| data->dasd_read_time3[endtime_ind]++; |
| } |
| } |
| |
| static void dasd_profile_end(struct dasd_block *block, |
| struct dasd_ccw_req *cqr, |
| struct request *req) |
| { |
| long strtime, irqtime, endtime, tottime; /* in microseconds */ |
| long tottimeps, sectors; |
| struct dasd_device *device; |
| int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind; |
| int irqtime_ind, irqtimeps_ind, endtime_ind; |
| |
| device = cqr->startdev; |
| if (!(dasd_global_profile_level || |
| block->profile.data || |
| device->profile.data)) |
| return; |
| |
| sectors = blk_rq_sectors(req); |
| 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; |
| |
| dasd_profile_counter(sectors, sectors_ind); |
| dasd_profile_counter(tottime, tottime_ind); |
| dasd_profile_counter(tottimeps, tottimeps_ind); |
| dasd_profile_counter(strtime, strtime_ind); |
| dasd_profile_counter(irqtime, irqtime_ind); |
| dasd_profile_counter(irqtime / sectors, irqtimeps_ind); |
| dasd_profile_counter(endtime, endtime_ind); |
| |
| if (dasd_global_profile_level) { |
| dasd_profile_end_add_data(&dasd_global_profile_data, |
| cqr->startdev != block->base, |
| cqr->cpmode == 1, |
| rq_data_dir(req) == READ, |
| sectors, sectors_ind, tottime_ind, |
| tottimeps_ind, strtime_ind, |
| irqtime_ind, irqtimeps_ind, |
| endtime_ind); |
| } |
| |
| spin_lock(&block->profile.lock); |
| if (block->profile.data) |
| dasd_profile_end_add_data(block->profile.data, |
| cqr->startdev != block->base, |
| cqr->cpmode == 1, |
| rq_data_dir(req) == READ, |
| sectors, sectors_ind, tottime_ind, |
| tottimeps_ind, strtime_ind, |
| irqtime_ind, irqtimeps_ind, |
| endtime_ind); |
| spin_unlock(&block->profile.lock); |
| |
| spin_lock(&device->profile.lock); |
| if (device->profile.data) |
| dasd_profile_end_add_data(device->profile.data, |
| cqr->startdev != block->base, |
| cqr->cpmode == 1, |
| rq_data_dir(req) == READ, |
| sectors, sectors_ind, tottime_ind, |
| tottimeps_ind, strtime_ind, |
| irqtime_ind, irqtimeps_ind, |
| endtime_ind); |
| spin_unlock(&device->profile.lock); |
| } |
| |
| void dasd_profile_reset(struct dasd_profile *profile) |
| { |
| struct dasd_profile_info *data; |
| |
| spin_lock_bh(&profile->lock); |
| data = profile->data; |
| if (!data) { |
| spin_unlock_bh(&profile->lock); |
| return; |
| } |
| memset(data, 0, sizeof(*data)); |
| getnstimeofday(&data->starttod); |
| spin_unlock_bh(&profile->lock); |
| } |
| |
| void dasd_global_profile_reset(void) |
| { |
| memset(&dasd_global_profile_data, 0, sizeof(dasd_global_profile_data)); |
| getnstimeofday(&dasd_global_profile_data.starttod); |
| } |
| |
| int dasd_profile_on(struct dasd_profile *profile) |
| { |
| struct dasd_profile_info *data; |
| |
| data = kzalloc(sizeof(*data), GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| spin_lock_bh(&profile->lock); |
| if (profile->data) { |
| spin_unlock_bh(&profile->lock); |
| kfree(data); |
| return 0; |
| } |
| getnstimeofday(&data->starttod); |
| profile->data = data; |
| spin_unlock_bh(&profile->lock); |
| return 0; |
| } |
| |
| void dasd_profile_off(struct dasd_profile *profile) |
| { |
| spin_lock_bh(&profile->lock); |
| kfree(profile->data); |
| profile->data = NULL; |
| spin_unlock_bh(&profile->lock); |
| } |
| |
| char *dasd_get_user_string(const char __user *user_buf, size_t user_len) |
| { |
| char *buffer; |
| |
| buffer = vmalloc(user_len + 1); |
| if (buffer == NULL) |
| return ERR_PTR(-ENOMEM); |
| if (copy_from_user(buffer, user_buf, user_len) != 0) { |
| vfree(buffer); |
| return ERR_PTR(-EFAULT); |
| } |
| /* got the string, now strip linefeed. */ |
| if (buffer[user_len - 1] == '\n') |
| buffer[user_len - 1] = 0; |
| else |
| buffer[user_len] = 0; |
| return buffer; |
| } |
| |
| static ssize_t dasd_stats_write(struct file *file, |
| const char __user *user_buf, |
| size_t user_len, loff_t *pos) |
| { |
| char *buffer, *str; |
| int rc; |
| struct seq_file *m = (struct seq_file *)file->private_data; |
| struct dasd_profile *prof = m->private; |
| |
| if (user_len > 65536) |
| user_len = 65536; |
| buffer = dasd_get_user_string(user_buf, user_len); |
| if (IS_ERR(buffer)) |
| return PTR_ERR(buffer); |
| |
| str = skip_spaces(buffer); |
| rc = user_len; |
| if (strncmp(str, "reset", 5) == 0) { |
| dasd_profile_reset(prof); |
| } else if (strncmp(str, "on", 2) == 0) { |
| rc = dasd_profile_on(prof); |
| if (!rc) |
| rc = user_len; |
| } else if (strncmp(str, "off", 3) == 0) { |
| dasd_profile_off(prof); |
| } else |
| rc = -EINVAL; |
| vfree(buffer); |
| return rc; |
| } |
| |
| static void dasd_stats_array(struct seq_file *m, unsigned int *array) |
| { |
| int i; |
| |
| for (i = 0; i < 32; i++) |
| seq_printf(m, "%u ", array[i]); |
| seq_putc(m, '\n'); |
| } |
| |
| static void dasd_stats_seq_print(struct seq_file *m, |
| struct dasd_profile_info *data) |
| { |
| seq_printf(m, "start_time %ld.%09ld\n", |
| data->starttod.tv_sec, data->starttod.tv_nsec); |
| seq_printf(m, "total_requests %u\n", data->dasd_io_reqs); |
| seq_printf(m, "total_sectors %u\n", data->dasd_io_sects); |
| seq_printf(m, "total_pav %u\n", data->dasd_io_alias); |
| seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm); |
| seq_printf(m, "histogram_sectors "); |
| dasd_stats_array(m, data->dasd_io_secs); |
| seq_printf(m, "histogram_io_times "); |
| dasd_stats_array(m, data->dasd_io_times); |
| seq_printf(m, "histogram_io_times_weighted "); |
| dasd_stats_array(m, data->dasd_io_timps); |
| seq_printf(m, "histogram_time_build_to_ssch "); |
| dasd_stats_array(m, data->dasd_io_time1); |
| seq_printf(m, "histogram_time_ssch_to_irq "); |
| dasd_stats_array(m, data->dasd_io_time2); |
| seq_printf(m, "histogram_time_ssch_to_irq_weighted "); |
| dasd_stats_array(m, data->dasd_io_time2ps); |
| seq_printf(m, "histogram_time_irq_to_end "); |
| dasd_stats_array(m, data->dasd_io_time3); |
| seq_printf(m, "histogram_ccw_queue_length "); |
| dasd_stats_array(m, data->dasd_io_nr_req); |
| seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs); |
| seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects); |
| seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias); |
| seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm); |
| seq_printf(m, "histogram_read_sectors "); |
| dasd_stats_array(m, data->dasd_read_secs); |
| seq_printf(m, "histogram_read_times "); |
| dasd_stats_array(m, data->dasd_read_times); |
| seq_printf(m, "histogram_read_time_build_to_ssch "); |
| dasd_stats_array(m, data->dasd_read_time1); |
| seq_printf(m, "histogram_read_time_ssch_to_irq "); |
| dasd_stats_array(m, data->dasd_read_time2); |
| seq_printf(m, "histogram_read_time_irq_to_end "); |
| dasd_stats_array(m, data->dasd_read_time3); |
| seq_printf(m, "histogram_read_ccw_queue_length "); |
| dasd_stats_array(m, data->dasd_read_nr_req); |
| } |
| |
| static int dasd_stats_show(struct seq_file *m, void *v) |
| { |
| struct dasd_profile *profile; |
| struct dasd_profile_info *data; |
| |
| profile = m->private; |
| spin_lock_bh(&profile->lock); |
| data = profile->data; |
| if (!data) { |
| spin_unlock_bh(&profile->lock); |
| seq_printf(m, "disabled\n"); |
| return 0; |
| } |
| dasd_stats_seq_print(m, data); |
| spin_unlock_bh(&profile->lock); |
| return 0; |
| } |
| |
| static int dasd_stats_open(struct inode *inode, struct file *file) |
| { |
| struct dasd_profile *profile = inode->i_private; |
| return single_open(file, dasd_stats_show, profile); |
| } |
| |
| static const struct file_operations dasd_stats_raw_fops = { |
| .owner = THIS_MODULE, |
| .open = dasd_stats_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| .write = dasd_stats_write, |
| }; |
| |
| static ssize_t dasd_stats_global_write(struct file *file, |
| const char __user *user_buf, |
| size_t user_len, loff_t *pos) |
| { |
| char *buffer, *str; |
| ssize_t rc; |
| |
| if (user_len > 65536) |
| user_len = 65536; |
| buffer = dasd_get_user_string(user_buf, user_len); |
| if (IS_ERR(buffer)) |
| return PTR_ERR(buffer); |
| str = skip_spaces(buffer); |
| rc = user_len; |
| if (strncmp(str, "reset", 5) == 0) { |
| dasd_global_profile_reset(); |
| } else if (strncmp(str, "on", 2) == 0) { |
| dasd_global_profile_reset(); |
| dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; |
| } else if (strncmp(str, "off", 3) == 0) { |
| dasd_global_profile_level = DASD_PROFILE_OFF; |
| } else |
| rc = -EINVAL; |
| vfree(buffer); |
| return rc; |
| } |
| |
| static int dasd_stats_global_show(struct seq_file *m, void *v) |
| { |
| if (!dasd_global_profile_level) { |
| seq_printf(m, "disabled\n"); |
| return 0; |
| } |
| dasd_stats_seq_print(m, &dasd_global_profile_data); |
| return 0; |
| } |
| |
| static int dasd_stats_global_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, dasd_stats_global_show, NULL); |
| } |
| |
| static const struct file_operations dasd_stats_global_fops = { |
| .owner = THIS_MODULE, |
| .open = dasd_stats_global_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| .write = dasd_stats_global_write, |
| }; |
| |
| static void dasd_profile_init(struct dasd_profile *profile, |
| struct dentry *base_dentry) |
| { |
| umode_t mode; |
| struct dentry *pde; |
| |
| if (!base_dentry) |
| return; |
| profile->dentry = NULL; |
| profile->data = NULL; |
| mode = (S_IRUSR | S_IWUSR | S_IFREG); |
| pde = debugfs_create_file("statistics", mode, base_dentry, |
| profile, &dasd_stats_raw_fops); |
| if (pde && !IS_ERR(pde)) |
| profile->dentry = pde; |
| return; |
| } |
| |
| static void dasd_profile_exit(struct dasd_profile *profile) |
| { |
| dasd_profile_off(profile); |
| debugfs_remove(profile->dentry); |
| profile->dentry = NULL; |
| } |
| |
| static void dasd_statistics_removeroot(void) |
| { |
| dasd_global_profile_level = DASD_PROFILE_OFF; |
| debugfs_remove(dasd_global_profile_dentry); |
| dasd_global_profile_dentry = NULL; |
| debugfs_remove(dasd_debugfs_global_entry); |
| debugfs_remove(dasd_debugfs_root_entry); |
| } |
| |
| static void dasd_statistics_createroot(void) |
| { |
| umode_t mode; |
| struct dentry *pde; |
| |
| dasd_debugfs_root_entry = NULL; |
| dasd_debugfs_global_entry = NULL; |
| dasd_global_profile_dentry = NULL; |
| pde = debugfs_create_dir("dasd", NULL); |
| if (!pde || IS_ERR(pde)) |
| goto error; |
| dasd_debugfs_root_entry = pde; |
| pde = debugfs_create_dir("global", dasd_debugfs_root_entry); |
| if (!pde || IS_ERR(pde)) |
| goto error; |
| dasd_debugfs_global_entry = pde; |
| |
| mode = (S_IRUSR | S_IWUSR | S_IFREG); |
| pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry, |
| NULL, &dasd_stats_global_fops); |
| if (!pde || IS_ERR(pde)) |
| goto error; |
| dasd_global_profile_dentry = pde; |
| return; |
| |
| error: |
| DBF_EVENT(DBF_ERR, "%s", |
| "Creation of the dasd debugfs interface failed"); |
| dasd_statistics_removeroot(); |
| return; |
| } |
| |
| #else |
| #define dasd_profile_start(block, cqr, req) do {} while (0) |
| #define dasd_profile_end(block, cqr, req) do {} while (0) |
| |
| static void dasd_statistics_createroot(void) |
| { |
| return; |
| } |
| |
| static void dasd_statistics_removeroot(void) |
| { |
| return; |
| } |
| |
| int dasd_stats_generic_show(struct seq_file *m, void *v) |
| { |
| seq_printf(m, "Statistics are not activated in this kernel\n"); |
| return 0; |
| } |
| |
| static void dasd_profile_init(struct dasd_profile *profile, |
| struct dentry *base_dentry) |
| { |
| return; |
| } |
| |
| static void dasd_profile_exit(struct dasd_profile *profile) |
| { |
| return; |
| } |
| |
| int dasd_profile_on(struct dasd_profile *profile) |
| { |
| return 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(int magic, int cplength, |
| int datasize, |
| struct dasd_device *device) |
| { |
| struct dasd_ccw_req *cqr; |
| |
| /* Sanity checks */ |
| BUG_ON(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); |
| } |
| } |
| cqr->magic = magic; |
| set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
| dasd_get_device(device); |
| return cqr; |
| } |
| EXPORT_SYMBOL(dasd_kmalloc_request); |
| |
| struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, |
| int datasize, |
| struct dasd_device *device) |
| { |
| unsigned long flags; |
| struct dasd_ccw_req *cqr; |
| char *data; |
| int 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); |
| } |
| cqr->magic = magic; |
| set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
| dasd_get_device(device); |
| return cqr; |
| } |
| EXPORT_SYMBOL(dasd_smalloc_request); |
| |
| /* |
| * 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); |
| } |
| EXPORT_SYMBOL(dasd_kfree_request); |
| |
| 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); |
| } |
| EXPORT_SYMBOL(dasd_sfree_request); |
| |
| /* |
| * 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->startdev; |
| if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
| DBF_DEV_EVENT(DBF_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; |
| char errorstring[ERRORLENGTH]; |
| |
| /* Check the cqr */ |
| rc = dasd_check_cqr(cqr); |
| if (rc) |
| return rc; |
| retries = 0; |
| device = (struct dasd_device *) cqr->startdev; |
| while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
| rc = ccw_device_clear(device->cdev, (long) cqr); |
| switch (rc) { |
| case 0: /* termination successful */ |
| cqr->status = DASD_CQR_CLEAR_PENDING; |
| cqr->stopclk = get_tod_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: |
| /* internal error 10 - unknown rc*/ |
| snprintf(errorstring, ERRORLENGTH, "10 %d", rc); |
| dev_err(&device->cdev->dev, "An error occurred in the " |
| "DASD device driver, reason=%s\n", errorstring); |
| BUG(); |
| break; |
| } |
| retries++; |
| } |
| dasd_schedule_device_bh(device); |
| return rc; |
| } |
| EXPORT_SYMBOL(dasd_term_IO); |
| |
| /* |
| * 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; |
| char errorstring[ERRORLENGTH]; |
| |
| /* Check the cqr */ |
| rc = dasd_check_cqr(cqr); |
| if (rc) { |
| cqr->intrc = rc; |
| return rc; |
| } |
| device = (struct dasd_device *) cqr->startdev; |
| if (((cqr->block && |
| test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) || |
| test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) && |
| !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { |
| DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p " |
| "because of stolen lock", cqr); |
| cqr->status = DASD_CQR_ERROR; |
| cqr->intrc = -EPERM; |
| return -EPERM; |
| } |
| if (cqr->retries < 0) { |
| /* internal error 14 - start_IO run out of retries */ |
| sprintf(errorstring, "14 %p", cqr); |
| dev_err(&device->cdev->dev, "An error occurred in the DASD " |
| "device driver, reason=%s\n", errorstring); |
| cqr->status = DASD_CQR_ERROR; |
| return -EIO; |
| } |
| cqr->startclk = get_tod_clock(); |
| cqr->starttime = jiffies; |
| cqr->retries--; |
| if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { |
| cqr->lpm &= device->path_data.opm; |
| if (!cqr->lpm) |
| cqr->lpm = device->path_data.opm; |
| } |
| if (cqr->cpmode == 1) { |
| rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, |
| (long) cqr, cqr->lpm); |
| } else { |
| rc = ccw_device_start(device->cdev, cqr->cpaddr, |
| (long) cqr, cqr->lpm, 0); |
| } |
| switch (rc) { |
| case 0: |
| cqr->status = DASD_CQR_IN_IO; |
| break; |
| case -EBUSY: |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
| "start_IO: device busy, retry later"); |
| break; |
| case -ETIMEDOUT: |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
| "start_IO: request timeout, retry later"); |
| break; |
| case -EACCES: |
| /* -EACCES indicates that the request used only a subset of the |
| * available paths and all these paths are gone. If the lpm of |
| * this request was only a subset of the opm (e.g. the ppm) then |
| * we just do a retry with all available paths. |
| * If we already use the full opm, something is amiss, and we |
| * need a full path verification. |
| */ |
| if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { |
| DBF_DEV_EVENT(DBF_WARNING, device, |
| "start_IO: selected paths gone (%x)", |
| cqr->lpm); |
| } else if (cqr->lpm != device->path_data.opm) { |
| cqr->lpm = device->path_data.opm; |
| DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
| "start_IO: selected paths gone," |
| " retry on all paths"); |
| } else { |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
| "start_IO: all paths in opm gone," |
| " do path verification"); |
| dasd_generic_last_path_gone(device); |
| device->path_data.opm = 0; |
| device->path_data.ppm = 0; |
| device->path_data.npm = 0; |
| device->path_data.tbvpm = |
| ccw_device_get_path_mask(device->cdev); |
| } |
| break; |
| case -ENODEV: |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
| "start_IO: -ENODEV device gone, retry"); |
| break; |
| case -EIO: |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
| "start_IO: -EIO device gone, retry"); |
| break; |
| case -EINVAL: |
| /* most likely caused in power management context */ |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
| "start_IO: -EINVAL device currently " |
| "not accessible"); |
| break; |
| default: |
| /* internal error 11 - unknown rc */ |
| snprintf(errorstring, ERRORLENGTH, "11 %d", rc); |
| dev_err(&device->cdev->dev, |
| "An error occurred in the DASD device driver, " |
| "reason=%s\n", errorstring); |
| BUG(); |
| break; |
| } |
| cqr->intrc = rc; |
| return rc; |
| } |
| EXPORT_SYMBOL(dasd_start_IO); |
| |
| /* |
| * 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_device_timeout(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 */ |
| dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
| spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| dasd_schedule_device_bh(device); |
| } |
| |
| /* |
| * Setup timeout for a device in jiffies. |
| */ |
| void dasd_device_set_timer(struct dasd_device *device, int expires) |
| { |
| if (expires == 0) |
| del_timer(&device->timer); |
| else |
| mod_timer(&device->timer, jiffies + expires); |
| } |
| EXPORT_SYMBOL(dasd_device_set_timer); |
| |
| /* |
| * Clear timeout for a device. |
| */ |
| void dasd_device_clear_timer(struct dasd_device *device) |
| { |
| del_timer(&device->timer); |
| } |
| EXPORT_SYMBOL(dasd_device_clear_timer); |
| |
| static void dasd_handle_killed_request(struct ccw_device *cdev, |
| unsigned long intparm) |
| { |
| struct dasd_ccw_req *cqr; |
| struct dasd_device *device; |
| |
| if (!intparm) |
| return; |
| cqr = (struct dasd_ccw_req *) intparm; |
| if (cqr->status != DASD_CQR_IN_IO) { |
| DBF_EVENT_DEVID(DBF_DEBUG, cdev, |
| "invalid status in handle_killed_request: " |
| "%02x", cqr->status); |
| return; |
| } |
| |
| device = dasd_device_from_cdev_locked(cdev); |
| if (IS_ERR(device)) { |
| DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
| "unable to get device from cdev"); |
| return; |
| } |
| |
| if (!cqr->startdev || |
| device != cqr->startdev || |
| strncmp(cqr->startdev->discipline->ebcname, |
| (char *) &cqr->magic, 4)) { |
| DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
| "invalid device in request"); |
| dasd_put_device(device); |
| return; |
| } |
| |
| /* Schedule request to be retried. */ |
| cqr->status = DASD_CQR_QUEUED; |
| |
| dasd_device_clear_timer(device); |
| dasd_schedule_device_bh(device); |
| dasd_put_device(device); |
| } |
| |
| void dasd_generic_handle_state_change(struct dasd_device *device) |
| { |
| /* First of all start sense subsystem status request. */ |
| dasd_eer_snss(device); |
| |
| dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
| dasd_schedule_device_bh(device); |
| if (device->block) |
| dasd_schedule_block_bh(device->block); |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
| |
| /* |
| * 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; |
| |
| if (IS_ERR(irb)) { |
| switch (PTR_ERR(irb)) { |
| case -EIO: |
| break; |
| case -ETIMEDOUT: |
| DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
| "request timed out\n", __func__); |
| break; |
| default: |
| DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
| "unknown error %ld\n", __func__, |
| PTR_ERR(irb)); |
| } |
| dasd_handle_killed_request(cdev, intparm); |
| return; |
| } |
| |
| now = get_tod_clock(); |
| cqr = (struct dasd_ccw_req *) intparm; |
| /* check for conditions that should be handled immediately */ |
| if (!cqr || |
| !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
| scsw_cstat(&irb->scsw) == 0)) { |
| if (cqr) |
| memcpy(&cqr->irb, irb, sizeof(*irb)); |
| device = dasd_device_from_cdev_locked(cdev); |
| if (IS_ERR(device)) |
| return; |
| /* ignore unsolicited interrupts for DIAG discipline */ |
| if (device->discipline == dasd_diag_discipline_pointer) { |
| dasd_put_device(device); |
| return; |
| } |
| device->discipline->dump_sense_dbf(device, irb, "int"); |
| if (device->features & DASD_FEATURE_ERPLOG) |
| device->discipline->dump_sense(device, cqr, irb); |
| device->discipline->check_for_device_change(device, cqr, irb); |
| dasd_put_device(device); |
| } |
| if (!cqr) |
| return; |
| |
| device = (struct dasd_device *) cqr->startdev; |
| if (!device || |
| strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
| DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
| "invalid device in request"); |
| return; |
| } |
| |
| /* Check for clear pending */ |
| if (cqr->status == DASD_CQR_CLEAR_PENDING && |
| scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { |
| cqr->status = DASD_CQR_CLEARED; |
| dasd_device_clear_timer(device); |
| wake_up(&dasd_flush_wq); |
| dasd_schedule_device_bh(device); |
| return; |
| } |
| |
| /* check status - the request might have been killed by dyn detach */ |
| if (cqr->status != DASD_CQR_IN_IO) { |
| DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " |
| "status %02x", dev_name(&cdev->dev), cqr->status); |
| return; |
| } |
| |
| next = NULL; |
| expires = 0; |
| if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
| scsw_cstat(&irb->scsw) == 0) { |
| /* request was completed successfully */ |
| cqr->status = DASD_CQR_SUCCESS; |
| cqr->stopclk = now; |
| /* Start first request on queue if possible -> fast_io. */ |
| if (cqr->devlist.next != &device->ccw_queue) { |
| next = list_entry(cqr->devlist.next, |
| struct dasd_ccw_req, devlist); |
| } |
| } else { /* error */ |
| /* |
| * If we don't want complex ERP for this request, then just |
| * reset this and retry it in the fastpath |
| */ |
| if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
| cqr->retries > 0) { |
| if (cqr->lpm == device->path_data.opm) |
| DBF_DEV_EVENT(DBF_DEBUG, device, |
| "default ERP in fastpath " |
| "(%i retries left)", |
| cqr->retries); |
| if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) |
| cqr->lpm = device->path_data.opm; |
| cqr->status = DASD_CQR_QUEUED; |
| next = cqr; |
| } else |
| cqr->status = DASD_CQR_ERROR; |
| } |
| if (next && (next->status == DASD_CQR_QUEUED) && |
| (!device->stopped)) { |
| if (device->discipline->start_IO(next) == 0) |
| expires = next->expires; |
| } |
| if (expires != 0) |
| dasd_device_set_timer(device, expires); |
| else |
| dasd_device_clear_timer(device); |
| dasd_schedule_device_bh(device); |
| } |
| EXPORT_SYMBOL(dasd_int_handler); |
| |
| enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb) |
| { |
| struct dasd_device *device; |
| |
| device = dasd_device_from_cdev_locked(cdev); |
| |
| if (IS_ERR(device)) |
| goto out; |
| if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || |
| device->state != device->target || |
| !device->discipline->check_for_device_change){ |
| dasd_put_device(device); |
| goto out; |
| } |
| if (device->discipline->dump_sense_dbf) |
| device->discipline->dump_sense_dbf(device, irb, "uc"); |
| device->discipline->check_for_device_change(device, NULL, irb); |
| dasd_put_device(device); |
| out: |
| return UC_TODO_RETRY; |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_uc_handler); |
| |
| /* |
| * If we have an error on a dasd_block layer request then we cancel |
| * and return all further requests from the same dasd_block as well. |
| */ |
| static void __dasd_device_recovery(struct dasd_device *device, |
| struct dasd_ccw_req *ref_cqr) |
| { |
| struct list_head *l, *n; |
| struct dasd_ccw_req *cqr; |
| |
| /* |
| * only requeue request that came from the dasd_block layer |
| */ |
| if (!ref_cqr->block) |
| return; |
| |
| list_for_each_safe(l, n, &device->ccw_queue) { |
| cqr = list_entry(l, struct dasd_ccw_req, devlist); |
| if (cqr->status == DASD_CQR_QUEUED && |
| ref_cqr->block == cqr->block) { |
| cqr->status = DASD_CQR_CLEARED; |
| } |
| } |
| }; |
| |
| /* |
| * Remove those ccw requests from the queue that need to be returned |
| * to the upper layer. |
| */ |
| static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
| struct list_head *final_queue) |
| { |
| struct list_head *l, *n; |
| struct dasd_ccw_req *cqr; |
| |
| /* Process request with final status. */ |
| list_for_each_safe(l, n, &device->ccw_queue) { |
| cqr = list_entry(l, struct dasd_ccw_req, devlist); |
| |
| /* Skip any non-final request. */ |
| if (cqr->status == DASD_CQR_QUEUED || |
| cqr->status == DASD_CQR_IN_IO || |
| cqr->status == DASD_CQR_CLEAR_PENDING) |
| continue; |
| if (cqr->status == DASD_CQR_ERROR) { |
| __dasd_device_recovery(device, cqr); |
| } |
| /* Rechain finished requests to final queue */ |
| list_move_tail(&cqr->devlist, final_queue); |
| } |
| } |
| |
| /* |
| * the cqrs from the final queue are returned to the upper layer |
| * by setting a dasd_block state and calling the callback function |
| */ |
| static void __dasd_device_process_final_queue(struct dasd_device *device, |
| struct list_head *final_queue) |
| { |
| struct list_head *l, *n; |
| struct dasd_ccw_req *cqr; |
| struct dasd_block *block; |
| void (*callback)(struct dasd_ccw_req *, void *data); |
| void *callback_data; |
| char errorstring[ERRORLENGTH]; |
| |
| list_for_each_safe(l, n, final_queue) { |
| cqr = list_entry(l, struct dasd_ccw_req, devlist); |
| list_del_init(&cqr->devlist); |
| block = cqr->block; |
| callback = cqr->callback; |
| callback_data = cqr->callback_data; |
| if (block) |
| spin_lock_bh(&block->queue_lock); |
| switch (cqr->status) { |
| case DASD_CQR_SUCCESS: |
| cqr->status = DASD_CQR_DONE; |
| break; |
| case DASD_CQR_ERROR: |
| cqr->status = DASD_CQR_NEED_ERP; |
| break; |
| case DASD_CQR_CLEARED: |
| cqr->status = DASD_CQR_TERMINATED; |
| break; |
| default: |
| /* internal error 12 - wrong cqr status*/ |
| snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); |
| dev_err(&device->cdev->dev, |
| "An error occurred in the DASD device driver, " |
| "reason=%s\n", errorstring); |
| BUG(); |
| } |
| if (cqr->callback != NULL) |
| (callback)(cqr, callback_data); |
| if (block) |
| spin_unlock_bh(&block->queue_lock); |
| } |
| } |
| |
| /* |
| * 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 void __dasd_device_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, devlist); |
| if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
| (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { |
| if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { |
| /* |
| * IO in safe offline processing should not |
| * run out of retries |
| */ |
| cqr->retries++; |
| } |
| if (device->discipline->term_IO(cqr) != 0) { |
| /* Hmpf, try again in 5 sec */ |
| dev_err(&device->cdev->dev, |
| "cqr %p timed out (%lus) but cannot be " |
| "ended, retrying in 5 s\n", |
| cqr, (cqr->expires/HZ)); |
| cqr->expires += 5*HZ; |
| dasd_device_set_timer(device, 5*HZ); |
| } else { |
| dev_err(&device->cdev->dev, |
| "cqr %p timed out (%lus), %i retries " |
| "remaining\n", cqr, (cqr->expires/HZ), |
| cqr->retries); |
| } |
| } |
| } |
| |
| /* |
| * Take a look at the first request on the ccw queue and check |
| * if it needs to be started. |
| */ |
| static void __dasd_device_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, devlist); |
| if (cqr->status != DASD_CQR_QUEUED) |
| return; |
| /* when device is stopped, return request to previous layer |
| * exception: only the disconnect or unresumed bits are set and the |
| * cqr is a path verification request |
| */ |
| if (device->stopped && |
| !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM)) |
| && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) { |
| cqr->intrc = -EAGAIN; |
| cqr->status = DASD_CQR_CLEARED; |
| dasd_schedule_device_bh(device); |
| return; |
| } |
| |
| rc = device->discipline->start_IO(cqr); |
| if (rc == 0) |
| dasd_device_set_timer(device, cqr->expires); |
| else if (rc == -EACCES) { |
| dasd_schedule_device_bh(device); |
| } else |
| /* Hmpf, try again in 1/2 sec */ |
| dasd_device_set_timer(device, 50); |
| } |
| |
| static void __dasd_device_check_path_events(struct dasd_device *device) |
| { |
| int rc; |
| |
| if (device->path_data.tbvpm) { |
| if (device->stopped & ~(DASD_STOPPED_DC_WAIT | |
| DASD_UNRESUMED_PM)) |
| return; |
| rc = device->discipline->verify_path( |
| device, device->path_data.tbvpm); |
| if (rc) |
| dasd_device_set_timer(device, 50); |
| else |
| device->path_data.tbvpm = 0; |
| } |
| }; |
| |
| /* |
| * Go through all request on the dasd_device request queue, |
| * terminate them on the cdev if necessary, and return them to the |
| * submitting layer via callback. |
| * Note: |
| * Make sure that all 'submitting layers' still exist when |
| * this function is called!. In other words, when 'device' is a base |
| * device then all block layer requests must have been removed before |
| * via dasd_flush_block_queue. |
| */ |
| int dasd_flush_device_queue(struct dasd_device *device) |
| { |
| struct dasd_ccw_req *cqr, *n; |
| int rc; |
| struct list_head flush_queue; |
| |
| INIT_LIST_HEAD(&flush_queue); |
| spin_lock_irq(get_ccwdev_lock(device->cdev)); |
| rc = 0; |
| list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
| /* 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_err(&device->cdev->dev, |
| "Flushing the DASD request queue " |
| "failed for request %p\n", cqr); |
| /* stop flush processing */ |
| goto finished; |
| } |
| break; |
| case DASD_CQR_QUEUED: |
| cqr->stopclk = get_tod_clock(); |
| cqr->status = DASD_CQR_CLEARED; |
| break; |
| default: /* no need to modify the others */ |
| break; |
| } |
| list_move_tail(&cqr->devlist, &flush_queue); |
| } |
| finished: |
| spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
| /* |
| * After this point all requests must be in state CLEAR_PENDING, |
| * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become |
| * one of the others. |
| */ |
| list_for_each_entry_safe(cqr, n, &flush_queue, devlist) |
| wait_event(dasd_flush_wq, |
| (cqr->status != DASD_CQR_CLEAR_PENDING)); |
| /* |
| * Now set each request back to TERMINATED, DONE or NEED_ERP |
| * and call the callback function of flushed requests |
| */ |
| __dasd_device_process_final_queue(device, &flush_queue); |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(dasd_flush_device_queue); |
| |
| /* |
| * Acquire the device lock and process queues for the device. |
| */ |
| static void dasd_device_tasklet(struct dasd_device *device) |
| { |
| struct list_head final_queue; |
| |
| 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_device_check_expire(device); |
| /* find final requests on ccw queue */ |
| __dasd_device_process_ccw_queue(device, &final_queue); |
| __dasd_device_check_path_events(device); |
| spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
| /* Now call the callback function of requests with final status */ |
| __dasd_device_process_final_queue(device, &final_queue); |
| spin_lock_irq(get_ccwdev_lock(device->cdev)); |
| /* Now check if the head of the ccw queue needs to be started. */ |
| __dasd_device_start_head(device); |
| spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
| if (waitqueue_active(&shutdown_waitq)) |
| wake_up(&shutdown_waitq); |
| dasd_put_device(device); |
| } |
| |
| /* |
| * Schedules a call to dasd_tasklet over the device tasklet. |
| */ |
| void dasd_schedule_device_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); |
| } |
| EXPORT_SYMBOL(dasd_schedule_device_bh); |
| |
| void dasd_device_set_stop_bits(struct dasd_device *device, int bits) |
| { |
| device->stopped |= bits; |
| } |
| EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); |
| |
| void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) |
| { |
| device->stopped &= ~bits; |
| if (!device->stopped) |
| wake_up(&generic_waitq); |
| } |
| EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); |
| |
| /* |
| * Queue a request to the head of the device ccw_queue. |
| * Start the I/O if possible. |
| */ |
| void dasd_add_request_head(struct dasd_ccw_req *cqr) |
| { |
| struct dasd_device *device; |
| unsigned long flags; |
| |
| device = cqr->startdev; |
| spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
| cqr->status = DASD_CQR_QUEUED; |
| list_add(&cqr->devlist, &device->ccw_queue); |
| /* let the bh start the request to keep them in order */ |
| dasd_schedule_device_bh(device); |
| spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| } |
| EXPORT_SYMBOL(dasd_add_request_head); |
| |
| /* |
| * Queue a request to the tail of the device ccw_queue. |
| * Start the I/O if possible. |
| */ |
| void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
| { |
| struct dasd_device *device; |
| unsigned long flags; |
| |
| device = cqr->startdev; |
| spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
| cqr->status = DASD_CQR_QUEUED; |
| list_add_tail(&cqr->devlist, &device->ccw_queue); |
| /* let the bh start the request to keep them in order */ |
| dasd_schedule_device_bh(device); |
| spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| } |
| EXPORT_SYMBOL(dasd_add_request_tail); |
| |
| /* |
| * Wakeup helper for the 'sleep_on' functions. |
| */ |
| void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
| { |
| spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); |
| cqr->callback_data = DASD_SLEEPON_END_TAG; |
| spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); |
| wake_up(&generic_waitq); |
| } |
| EXPORT_SYMBOL_GPL(dasd_wakeup_cb); |
| |
| static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
| { |
| struct dasd_device *device; |
| int rc; |
| |
| device = cqr->startdev; |
| spin_lock_irq(get_ccwdev_lock(device->cdev)); |
| rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); |
| spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
| return rc; |
| } |
| |
| /* |
| * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. |
| */ |
| static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) |
| { |
| struct dasd_device *device; |
| dasd_erp_fn_t erp_fn; |
| |
| if (cqr->status == DASD_CQR_FILLED) |
| return 0; |
| device = cqr->startdev; |
| if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { |
| if (cqr->status == DASD_CQR_TERMINATED) { |
| device->discipline->handle_terminated_request(cqr); |
| return 1; |
| } |
| if (cqr->status == DASD_CQR_NEED_ERP) { |
| erp_fn = device->discipline->erp_action(cqr); |
| erp_fn(cqr); |
| return 1; |
| } |
| if (cqr->status == DASD_CQR_FAILED) |
| dasd_log_sense(cqr, &cqr->irb); |
| if (cqr->refers) { |
| __dasd_process_erp(device, cqr); |
| return 1; |
| } |
| } |
| return 0; |
| } |
| |
| static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) |
| { |
| if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { |
| if (cqr->refers) /* erp is not done yet */ |
| return 1; |
| return ((cqr->status != DASD_CQR_DONE) && |
| (cqr->status != DASD_CQR_FAILED)); |
| } else |
| return (cqr->status == DASD_CQR_FILLED); |
| } |
| |
| static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) |
| { |
| struct dasd_device *device; |
| int rc; |
| struct list_head ccw_queue; |
| struct dasd_ccw_req *cqr; |
| |
| INIT_LIST_HEAD(&ccw_queue); |
| maincqr->status = DASD_CQR_FILLED; |
| device = maincqr->startdev; |
| list_add(&maincqr->blocklist, &ccw_queue); |
| for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); |
| cqr = list_first_entry(&ccw_queue, |
| struct dasd_ccw_req, blocklist)) { |
| |
| if (__dasd_sleep_on_erp(cqr)) |
| continue; |
| if (cqr->status != DASD_CQR_FILLED) /* could be failed */ |
| continue; |
| if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && |
| !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { |
| cqr->status = DASD_CQR_FAILED; |
| cqr->intrc = -EPERM; |
| continue; |
| } |
| /* 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; |
| cqr->intrc = -ENOLINK; |
| continue; |
| } |
| /* Don't try to start requests if device is stopped */ |
| if (interruptible) { |
| rc = wait_event_interruptible( |
| generic_waitq, !(device->stopped)); |
| if (rc == -ERESTARTSYS) { |
| cqr->status = DASD_CQR_FAILED; |
| maincqr->intrc = rc; |
| continue; |
| } |
| } else |
| wait_event(generic_waitq, !(device->stopped)); |
| |
| if (!cqr->callback) |
| cqr->callback = dasd_wakeup_cb; |
| |
| cqr->callback_data = DASD_SLEEPON_START_TAG; |
| dasd_add_request_tail(cqr); |
| if (interruptible) { |
| rc = wait_event_interruptible( |
| generic_waitq, _wait_for_wakeup(cqr)); |
| if (rc == -ERESTARTSYS) { |
| dasd_cancel_req(cqr); |
| /* wait (non-interruptible) for final status */ |
| wait_event(generic_waitq, |
| _wait_for_wakeup(cqr)); |
| cqr->status = DASD_CQR_FAILED; |
| maincqr->intrc = rc; |
| continue; |
| } |
| } else |
| wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
| } |
| |
| maincqr->endclk = get_tod_clock(); |
| if ((maincqr->status != DASD_CQR_DONE) && |
| (maincqr->intrc != -ERESTARTSYS)) |
| dasd_log_sense(maincqr, &maincqr->irb); |
| if (maincqr->status == DASD_CQR_DONE) |
| rc = 0; |
| else if (maincqr->intrc) |
| rc = maincqr->intrc; |
| else |
| rc = -EIO; |
| return rc; |
| } |
| |
| static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue) |
| { |
| struct dasd_ccw_req *cqr; |
| |
| list_for_each_entry(cqr, ccw_queue, blocklist) { |
| if (cqr->callback_data != DASD_SLEEPON_END_TAG) |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible) |
| { |
| struct dasd_device *device; |
| int rc; |
| struct dasd_ccw_req *cqr, *n; |
| |
| retry: |
| list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { |
| device = cqr->startdev; |
| if (cqr->status != DASD_CQR_FILLED) /*could be failed*/ |
| continue; |
| |
| if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && |
| !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { |
| cqr->status = DASD_CQR_FAILED; |
| cqr->intrc = -EPERM; |
| continue; |
| } |
| /*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; |
| cqr->intrc = -EAGAIN; |
| continue; |
| } |
| |
| /*Don't try to start requests if device is stopped*/ |
| if (interruptible) { |
| rc = wait_event_interruptible( |
| generic_waitq, !device->stopped); |
| if (rc == -ERESTARTSYS) { |
| cqr->status = DASD_CQR_FAILED; |
| cqr->intrc = rc; |
| continue; |
| } |
| } else |
| wait_event(generic_waitq, !(device->stopped)); |
| |
| if (!cqr->callback) |
| cqr->callback = dasd_wakeup_cb; |
| cqr->callback_data = DASD_SLEEPON_START_TAG; |
| dasd_add_request_tail(cqr); |
| } |
| |
| wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue)); |
| |
| rc = 0; |
| list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { |
| if (__dasd_sleep_on_erp(cqr)) |
| rc = 1; |
| } |
| if (rc) |
| goto retry; |
| |
| |
| return 0; |
| } |
| |
| /* |
| * Queue a request to the tail of the device ccw_queue and wait for |
| * it's completion. |
| */ |
| int dasd_sleep_on(struct dasd_ccw_req *cqr) |
| { |
| return _dasd_sleep_on(cqr, 0); |
| } |
| EXPORT_SYMBOL(dasd_sleep_on); |
| |
| /* |
| * Start requests from a ccw_queue and wait for their completion. |
| */ |
| int dasd_sleep_on_queue(struct list_head *ccw_queue) |
| { |
| return _dasd_sleep_on_queue(ccw_queue, 0); |
| } |
| EXPORT_SYMBOL(dasd_sleep_on_queue); |
| |
| /* |
| * Queue a request to the tail of the device ccw_queue and wait |
| * interruptible for it's completion. |
| */ |
| int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
| { |
| return _dasd_sleep_on(cqr, 1); |
| } |
| EXPORT_SYMBOL(dasd_sleep_on_interruptible); |
| |
| /* |
| * 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; |
| int rc; |
| |
| if (list_empty(&device->ccw_queue)) |
| return 0; |
| cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
| rc = device->discipline->term_IO(cqr); |
| if (!rc) |
| /* |
| * CQR terminated because a more important request is pending. |
| * Undo decreasing of retry counter because this is |
| * not an error case. |
| */ |
| cqr->retries++; |
| return rc; |
| } |
| |
| int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
| { |
| struct dasd_device *device; |
| int rc; |
| |
| device = cqr->startdev; |
| if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && |
| !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { |
| cqr->status = DASD_CQR_FAILED; |
| cqr->intrc = -EPERM; |
| return -EIO; |
| } |
| 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; |
| } |
| cqr->callback = dasd_wakeup_cb; |
| cqr->callback_data = DASD_SLEEPON_START_TAG; |
| cqr->status = DASD_CQR_QUEUED; |
| /* |
| * add new request as second |
| * first the terminated cqr needs to be finished |
| */ |
| list_add(&cqr->devlist, device->ccw_queue.next); |
| |
| /* let the bh start the request to keep them in order */ |
| dasd_schedule_device_bh(device); |
| |
| spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
| |
| wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
| |
| if (cqr->status == DASD_CQR_DONE) |
| rc = 0; |
| else if (cqr->intrc) |
| rc = cqr->intrc; |
| else |
| rc = -EIO; |
| |
| /* kick tasklets */ |
| dasd_schedule_device_bh(device); |
| if (device->block) |
| dasd_schedule_block_bh(device->block); |
| |
| return rc; |
| } |
| EXPORT_SYMBOL(dasd_sleep_on_immediatly); |
| |
| /* |
| * 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 0 if request termination was successful |
| * negative error code if termination failed |
| * Cancellation of a request is an asynchronous operation! The calling |
| * function has to wait until the request is properly returned via callback. |
| */ |
| int dasd_cancel_req(struct dasd_ccw_req *cqr) |
| { |
| struct dasd_device *device = cqr->startdev; |
| 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 cleared */ |
| cqr->status = DASD_CQR_CLEARED; |
| break; |
| case DASD_CQR_IN_IO: |
| /* request in IO - terminate IO and release again */ |
| rc = device->discipline->term_IO(cqr); |
| if (rc) { |
| dev_err(&device->cdev->dev, |
| "Cancelling request %p failed with rc=%d\n", |
| cqr, rc); |
| } else { |
| cqr->stopclk = get_tod_clock(); |
| } |
| break; |
| default: /* already finished or clear pending - do nothing */ |
| break; |
| } |
| spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| dasd_schedule_device_bh(device); |
| return rc; |
| } |
| EXPORT_SYMBOL(dasd_cancel_req); |
| |
| /* |
| * SECTION: Operations of the dasd_block layer. |
| */ |
| |
| /* |
| * Timeout function for dasd_block. This is used when the block layer |
| * is waiting for something that may not come reliably, (e.g. a state |
| * change interrupt) |
| */ |
| static void dasd_block_timeout(unsigned long ptr) |
| { |
| unsigned long flags; |
| struct dasd_block *block; |
| |
| block = (struct dasd_block *) ptr; |
| spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); |
| /* re-activate request queue */ |
| dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); |
| spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); |
| dasd_schedule_block_bh(block); |
| } |
| |
| /* |
| * Setup timeout for a dasd_block in jiffies. |
| */ |
| void dasd_block_set_timer(struct dasd_block *block, int expires) |
| { |
| if (expires == 0) |
| del_timer(&block->timer); |
| else |
| mod_timer(&block->timer, jiffies + expires); |
| } |
| EXPORT_SYMBOL(dasd_block_set_timer); |
| |
| /* |
| * Clear timeout for a dasd_block. |
| */ |
| void dasd_block_clear_timer(struct dasd_block *block) |
| { |
| del_timer(&block->timer); |
| } |
| EXPORT_SYMBOL(dasd_block_clear_timer); |
| |
| /* |
| * Process finished error recovery ccw. |
| */ |
| static 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_err(&device->cdev->dev, "ERP failed for the DASD\n"); |
| erp_fn = device->discipline->erp_postaction(cqr); |
| erp_fn(cqr); |
| } |
| |
| /* |
| * Fetch requests from the block device queue. |
| */ |
| static void __dasd_process_request_queue(struct dasd_block *block) |
| { |
| struct request_queue *queue; |
| struct request *req; |
| struct dasd_ccw_req *cqr; |
| struct dasd_device *basedev; |
| unsigned long flags; |
| queue = block->request_queue; |
| basedev = block->base; |
| /* 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 (basedev->state < DASD_STATE_READY) { |
| while ((req = blk_fetch_request(block->request_queue))) |
| __blk_end_request_all(req, -EIO); |
| return; |
| } |
| /* Now we try to fetch requests from the request queue */ |
| while ((req = blk_peek_request(queue))) { |
| if (basedev->features & DASD_FEATURE_READONLY && |
| rq_data_dir(req) == WRITE) { |
| DBF_DEV_EVENT(DBF_ERR, basedev, |
| "Rejecting write request %p", |
| req); |
| blk_start_request(req); |
| __blk_end_request_all(req, -EIO); |
| continue; |
| } |
| if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) && |
| (basedev->features & DASD_FEATURE_FAILFAST || |
| blk_noretry_request(req))) { |
| DBF_DEV_EVENT(DBF_ERR, basedev, |
| "Rejecting failfast request %p", |
| req); |
| blk_start_request(req); |
| __blk_end_request_all(req, -ETIMEDOUT); |
| continue; |
| } |
| cqr = basedev->discipline->build_cp(basedev, block, req); |
| if (IS_ERR(cqr)) { |
| if (PTR_ERR(cqr) == -EBUSY) |
| break; /* normal end condition */ |
| if (PTR_ERR(cqr) == -ENOMEM) |
| break; /* terminate request queue loop */ |
| if (PTR_ERR(cqr) == -EAGAIN) { |
| /* |
| * The current request cannot be build right |
| * now, we have to try later. If this request |
| * is the head-of-queue we stop the device |
| * for 1/2 second. |
| */ |
| if (!list_empty(&block->ccw_queue)) |
| break; |
| spin_lock_irqsave( |
| get_ccwdev_lock(basedev->cdev), flags); |
| dasd_device_set_stop_bits(basedev, |
| DASD_STOPPED_PENDING); |
| spin_unlock_irqrestore( |
| get_ccwdev_lock(basedev->cdev), flags); |
| dasd_block_set_timer(block, HZ/2); |
| break; |
| } |
| DBF_DEV_EVENT(DBF_ERR, basedev, |
| "CCW creation failed (rc=%ld) " |
| "on request %p", |
| PTR_ERR(cqr), req); |
| blk_start_request(req); |
| __blk_end_request_all(req, -EIO); |
| continue; |
| } |
| /* |
| * Note: callback is set to dasd_return_cqr_cb in |
| * __dasd_block_start_head to cover erp requests as well |
| */ |
| cqr->callback_data = (void *) req; |
| cqr->status = DASD_CQR_FILLED; |
| req->completion_data = cqr; |
| blk_start_request(req); |
| list_add_tail(&cqr->blocklist, &block->ccw_queue); |
| INIT_LIST_HEAD(&cqr->devlist); |
| dasd_profile_start(block, cqr, req); |
| } |
| } |
| |
| static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) |
| { |
| struct request *req; |
| int status; |
| int error = 0; |
| |
| req = (struct request *) cqr->callback_data; |
| dasd_profile_end(cqr->block, cqr, req); |
| status = cqr->block->base->discipline->free_cp(cqr, req); |
| if (status < 0) |
| error = status; |
| else if (status == 0) { |
| if (cqr->intrc == -EPERM) |
| error = -EBADE; |
| else if (cqr->intrc == -ENOLINK || |
| cqr->intrc == -ETIMEDOUT) |
| error = cqr->intrc; |
| else |
| error = -EIO; |
| } |
| __blk_end_request_all(req, error); |
| } |
| |
| /* |
| * Process ccw request queue. |
| */ |
| static void __dasd_process_block_ccw_queue(struct dasd_block *block, |
| struct list_head *final_queue) |
| { |
| struct list_head *l, *n; |
| struct dasd_ccw_req *cqr; |
| dasd_erp_fn_t erp_fn; |
| unsigned long flags; |
| struct dasd_device *base = block->base; |
| |
| restart: |
| /* Process request with final status. */ |
| list_for_each_safe(l, n, &block->ccw_queue) { |
| cqr = list_entry(l, struct dasd_ccw_req, blocklist); |
| if (cqr->status != DASD_CQR_DONE && |
| cqr->status != DASD_CQR_FAILED && |
| cqr->status != DASD_CQR_NEED_ERP && |
| cqr->status != DASD_CQR_TERMINATED) |
| continue; |
| |
| if (cqr->status == DASD_CQR_TERMINATED) { |
| base->discipline->handle_terminated_request(cqr); |
| goto restart; |
| } |
| |
| /* Process requests that may be recovered */ |
| if (cqr->status == DASD_CQR_NEED_ERP) { |
| erp_fn = base->discipline->erp_action(cqr); |
| if (IS_ERR(erp_fn(cqr))) |
| continue; |
| goto restart; |
| } |
| |
| /* log sense for fatal error */ |
| if (cqr->status == DASD_CQR_FAILED) { |
| dasd_log_sense(cqr, &cqr->irb); |
| } |
| |
| /* First of all call extended error reporting. */ |
| if (dasd_eer_enabled(base) && |
| cqr->status == DASD_CQR_FAILED) { |
| dasd_eer_write(base, cqr, DASD_EER_FATALERROR); |
| |
| /* restart request */ |
| cqr->status = DASD_CQR_FILLED; |
| cqr->retries = 255; |
| spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
| dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); |
| spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), |
| flags); |
| goto restart; |
| } |
| |
| /* Process finished ERP request. */ |
| if (cqr->refers) { |
| __dasd_process_erp(base, cqr); |
| goto restart; |
| } |
| |
| /* Rechain finished requests to final queue */ |
| cqr->endclk = get_tod_clock(); |
| list_move_tail(&cqr->blocklist, final_queue); |
| } |
| } |
| |
| static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) |
| { |
| dasd_schedule_block_bh(cqr->block); |
| } |
| |
| static void __dasd_block_start_head(struct dasd_block *block) |
| { |
| struct dasd_ccw_req *cqr; |
| |
| if (list_empty(&block->ccw_queue)) |
| return; |
| /* We allways begin with the first requests on the queue, as some |
| * of previously started requests have to be enqueued on a |
| * dasd_device again for error recovery. |
| */ |
| list_for_each_entry(cqr, &block->ccw_queue, blocklist) { |
| if (cqr->status != DASD_CQR_FILLED) |
| continue; |
| if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) && |
| !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { |
| cqr->status = DASD_CQR_FAILED; |
| cqr->intrc = -EPERM; |
| dasd_schedule_block_bh(block); |
| continue; |
| } |
| /* Non-temporary stop condition will trigger fail fast */ |
| if (block->base->stopped & ~DASD_STOPPED_PENDING && |
| test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && |
| (!dasd_eer_enabled(block->base))) { |
| cqr->status = DASD_CQR_FAILED; |
| cqr->intrc = -ENOLINK; |
| dasd_schedule_block_bh(block); |
| continue; |
| } |
| /* Don't try to start requests if device is stopped */ |
| if (block->base->stopped) |
| return; |
| |
| /* just a fail safe check, should not happen */ |
| if (!cqr->startdev) |
| cqr->startdev = block->base; |
| |
| /* make sure that the requests we submit find their way back */ |
| cqr->callback = dasd_return_cqr_cb; |
| |
| dasd_add_request_tail(cqr); |
| } |
| } |
| |
| /* |
| * Central dasd_block layer routine. Takes requests from the generic |
| * block layer request queue, creates ccw requests, enqueues them on |
| * a dasd_device and processes ccw requests that have been returned. |
| */ |
| static void dasd_block_tasklet(struct dasd_block *block) |
| { |
| struct list_head final_queue; |
| struct list_head *l, *n; |
| struct dasd_ccw_req *cqr; |
| |
| atomic_set(&block->tasklet_scheduled, 0); |
| INIT_LIST_HEAD(&final_queue); |
| spin_lock(&block->queue_lock); |
| /* Finish off requests on ccw queue */ |
| __dasd_process_block_ccw_queue(block, &final_queue); |
| spin_unlock(&block->queue_lock); |
| /* Now call the callback function of requests with final status */ |
| spin_lock_irq(&block->request_queue_lock); |
| list_for_each_safe(l, n, &final_queue) { |
| cqr = list_entry(l, struct dasd_ccw_req, blocklist); |
| list_del_init(&cqr->blocklist); |
| __dasd_cleanup_cqr(cqr); |
| } |
| spin_lock(&block->queue_lock); |
| /* Get new request from the block device request queue */ |
| __dasd_process_request_queue(block); |
| /* Now check if the head of the ccw queue needs to be started. */ |
| __dasd_block_start_head(block); |
| spin_unlock(&block->queue_lock); |
| spin_unlock_irq(&block->request_queue_lock); |
| if (waitqueue_active(&shutdown_waitq)) |
| wake_up(&shutdown_waitq); |
| dasd_put_device(block->base); |
| } |
| |
| static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) |
| { |
| wake_up(&dasd_flush_wq); |
| } |
| |
| /* |
| * Requeue a request back to the block request queue |
| * only works for block requests |
| */ |
| static int _dasd_requeue_request(struct dasd_ccw_req *cqr) |
| { |
| struct dasd_block *block = cqr->block; |
| struct request *req; |
| unsigned long flags; |
| |
| if (!block) |
| return -EINVAL; |
| spin_lock_irqsave(&block->queue_lock, flags); |
| req = (struct request *) cqr->callback_data; |
| blk_requeue_request(block->request_queue, req); |
| spin_unlock_irqrestore(&block->queue_lock, flags); |
| |
| return 0; |
| } |
| |
| /* |
| * Go through all request on the dasd_block request queue, cancel them |
| * on the respective dasd_device, and return them to the generic |
| * block layer. |
| */ |
| static int dasd_flush_block_queue(struct dasd_block *block) |
| { |
| struct dasd_ccw_req *cqr, *n; |
| int rc, i; |
| struct list_head flush_queue; |
| |
| INIT_LIST_HEAD(&flush_queue); |
| spin_lock_bh(&block->queue_lock); |
| rc = 0; |
| restart: |
| list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { |
| /* if this request currently owned by a dasd_device cancel it */ |
| if (cqr->status >= DASD_CQR_QUEUED) |
| rc = dasd_cancel_req(cqr); |
| if (rc < 0) |
| break; |
| /* Rechain request (including erp chain) so it won't be |
| * touched by the dasd_block_tasklet anymore. |
| * Replace the callback so we notice when the request |
| * is returned from the dasd_device layer. |
| */ |
| cqr->callback = _dasd_wake_block_flush_cb; |
| for (i = 0; cqr != NULL; cqr = cqr->refers, i++) |
| list_move_tail(&cqr->blocklist, &flush_queue); |
| if (i > 1) |
| /* moved more than one request - need to restart */ |
| goto restart; |
| } |
| spin_unlock_bh(&block->queue_lock); |
| /* Now call the callback function of flushed requests */ |
| restart_cb: |
| list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { |
| wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); |
| /* Process finished ERP request. */ |
| if (cqr->refers) { |
| spin_lock_bh(&block->queue_lock); |
| __dasd_process_erp(block->base, cqr); |
| spin_unlock_bh(&block->queue_lock); |
| /* restart list_for_xx loop since dasd_process_erp |
| * might remove multiple elements */ |
| goto restart_cb; |
| } |
| /* call the callback function */ |
| spin_lock_irq(&block->request_queue_lock); |
| cqr->endclk = get_tod_clock(); |
| list_del_init(&cqr->blocklist); |
| __dasd_cleanup_cqr(cqr); |
| spin_unlock_irq(&block->request_queue_lock); |
| } |
| return rc; |
| } |
| |
| /* |
| * Schedules a call to dasd_tasklet over the device tasklet. |
| */ |
| void dasd_schedule_block_bh(struct dasd_block *block) |
| { |
| /* Protect against rescheduling. */ |
| if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) |
| return; |
| /* life cycle of block is bound to it's base device */ |
| dasd_get_device(block->base); |
| tasklet_hi_schedule(&block->tasklet); |
| } |
| EXPORT_SYMBOL(dasd_schedule_block_bh); |
| |
| |
| /* |
| * SECTION: external block device operations |
| * (request queue handling, open, release, etc.) |
| */ |
| |
| /* |
| * Dasd request queue function. Called from ll_rw_blk.c |
| */ |
| static void do_dasd_request(struct request_queue *queue) |
| { |
| struct dasd_block *block; |
| |
| block = queue->queuedata; |
| spin_lock(&block->queue_lock); |
| /* Get new request from the block device request queue */ |
| __dasd_process_request_queue(block); |
| /* Now check if the head of the ccw queue needs to be started. */ |
| __dasd_block_start_head(block); |
| spin_unlock(&block->queue_lock); |
| } |
| |
| /* |
| * Block timeout callback, called from the block layer |
| * |
| * request_queue lock is held on entry. |
| * |
| * Return values: |
| * BLK_EH_RESET_TIMER if the request should be left running |
| * BLK_EH_NOT_HANDLED if the request is handled or terminated |
| * by the driver. |
| */ |
| enum blk_eh_timer_return dasd_times_out(struct request *req) |
| { |
| struct dasd_ccw_req *cqr = req->completion_data; |
| struct dasd_block *block = req->q->queuedata; |
| struct dasd_device *device; |
| int rc = 0; |
| |
| if (!cqr) |
| return BLK_EH_NOT_HANDLED; |
| |
| device = cqr->startdev ? cqr->startdev : block->base; |
| if (!device->blk_timeout) |
| return BLK_EH_RESET_TIMER; |
| DBF_DEV_EVENT(DBF_WARNING, device, |
| " dasd_times_out cqr %p status %x", |
| cqr, cqr->status); |
| |
| spin_lock(&block->queue_lock); |
| spin_lock(get_ccwdev_lock(device->cdev)); |
| cqr->retries = -1; |
| cqr->intrc = -ETIMEDOUT; |
| if (cqr->status >= DASD_CQR_QUEUED) { |
| spin_unlock(get_ccwdev_lock(device->cdev)); |
| rc = dasd_cancel_req(cqr); |
| } else if (cqr->status == DASD_CQR_FILLED || |
| cqr->status == DASD_CQR_NEED_ERP) { |
| cqr->status = DASD_CQR_TERMINATED; |
| spin_unlock(get_ccwdev_lock(device->cdev)); |
| } else if (cqr->status == DASD_CQR_IN_ERP) { |
| struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr; |
| |
| list_for_each_entry_safe(searchcqr, nextcqr, |
| &block->ccw_queue, blocklist) { |
| tmpcqr = searchcqr; |
| while (tmpcqr->refers) |
| tmpcqr = tmpcqr->refers; |
| if (tmpcqr != cqr) |
| continue; |
| /* searchcqr is an ERP request for cqr */ |
| searchcqr->retries = -1; |
| searchcqr->intrc = -ETIMEDOUT; |
| if (searchcqr->status >= DASD_CQR_QUEUED) { |
| spin_unlock(get_ccwdev_lock(device->cdev)); |
| rc = dasd_cancel_req(searchcqr); |
| spin_lock(get_ccwdev_lock(device->cdev)); |
| } else if ((searchcqr->status == DASD_CQR_FILLED) || |
| (searchcqr->status == DASD_CQR_NEED_ERP)) { |
| searchcqr->status = DASD_CQR_TERMINATED; |
| rc = 0; |
| } else if (searchcqr->status == DASD_CQR_IN_ERP) { |
| /* |
| * Shouldn't happen; most recent ERP |
| * request is at the front of queue |
| */ |
| continue; |
| } |
| break; |
| } |
| spin_unlock(get_ccwdev_lock(device->cdev)); |
| } |
| dasd_schedule_block_bh(block); |
| spin_unlock(&block->queue_lock); |
| |
| return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED; |
| } |
| |
| /* |
| * Allocate and initialize request queue and default I/O scheduler. |
| */ |
| static int dasd_alloc_queue(struct dasd_block *block) |
| { |
| int rc; |
| |
| block->request_queue = blk_init_queue(do_dasd_request, |
| &block->request_queue_lock); |
| if (block->request_queue == NULL) |
| return -ENOMEM; |
| |
| block->request_queue->queuedata = block; |
| |
| elevator_exit(block->request_queue->elevator); |
| block->request_queue->elevator = NULL; |
| mutex_lock(&block->request_queue->sysfs_lock); |
| rc = elevator_init(block->request_queue, "deadline"); |
| if (rc) |
| blk_cleanup_queue(block->request_queue); |
| mutex_unlock(&block->request_queue->sysfs_lock); |
| return rc; |
| } |
| |
| /* |
| * Allocate and initialize request queue. |
| */ |
| static void dasd_setup_queue(struct dasd_block *block) |
| { |
| int max; |
| |
| if (block->base->features & DASD_FEATURE_USERAW) { |
| /* |
| * the max_blocks value for raw_track access is 256 |
| * it is higher than the native ECKD value because we |
| * only need one ccw per track |
| * so the max_hw_sectors are |
| * 2048 x 512B = 1024kB = 16 tracks |
| */ |
| max = 2048; |
| } else { |
| max = block->base->discipline->max_blocks << block->s2b_shift; |
| } |
| blk_queue_logical_block_size(block->request_queue, |
| block->bp_block); |
| blk_queue_max_hw_sectors(block->request_queue, max); |
| blk_queue_max_segments(block->request_queue, -1L); |
| /* with page sized segments we can translate each segement into |
| * one idaw/tidaw |
| */ |
| blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); |
| blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); |
| } |
| |
| /* |
| * Deactivate and free request queue. |
| */ |
| static void dasd_free_queue(struct dasd_block *block) |
| { |
| if (block->request_queue) { |
| blk_cleanup_queue(block->request_queue); |
| block->request_queue = NULL; |
| } |
| } |
| |
| /* |
| * Flush request on the request queue. |
| */ |
| static void dasd_flush_request_queue(struct dasd_block *block) |
| { |
| struct request *req; |
| |
| if (!block->request_queue) |
| return; |
| |
| spin_lock_irq(&block->request_queue_lock); |
| while ((req = blk_fetch_request(block->request_queue))) |
| __blk_end_request_all(req, -EIO); |
| spin_unlock_irq(&block->request_queue_lock); |
| } |
| |
| static int dasd_open(struct block_device *bdev, fmode_t mode) |
| { |
| struct dasd_device *base; |
| int rc; |
| |
| base = dasd_device_from_gendisk(bdev->bd_disk); |
| if (!base) |
| return -ENODEV; |
| |
| atomic_inc(&base->block->open_count); |
| if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { |
| rc = -ENODEV; |
| goto unlock; |
| } |
| |
| if (!try_module_get(base->discipline->owner)) { |
| rc = -EINVAL; |
| goto unlock; |
| } |
| |
| if (dasd_probeonly) { |
| dev_info(&base->cdev->dev, |
| "Accessing the DASD failed because it is in " |
| "probeonly mode\n"); |
| rc = -EPERM; |
| goto out; |
| } |
| |
| if (base->state <= DASD_STATE_BASIC) { |
| DBF_DEV_EVENT(DBF_ERR, base, " %s", |
| " Cannot open unrecognized device"); |
| rc = -ENODEV; |
| goto out; |
| } |
| |
| if ((mode & FMODE_WRITE) && |
| (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || |
| (base->features & DASD_FEATURE_READONLY))) { |
| rc = -EROFS; |
| goto out; |
| } |
| |
| dasd_put_device(base); |
| return 0; |
| |
| out: |
| module_put(base->discipline->owner); |
| unlock: |
| atomic_dec(&base->block->open_count); |
| dasd_put_device(base); |
| return rc; |
| } |
| |
| static void dasd_release(struct gendisk *disk, fmode_t mode) |
| { |
| struct dasd_device *base = dasd_device_from_gendisk(disk); |
| if (base) { |
| atomic_dec(&base->block->open_count); |
| module_put(base->discipline->owner); |
| dasd_put_device(base); |
| } |
| } |
| |
| /* |
| * Return disk geometry. |
| */ |
| static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| { |
| struct dasd_device *base; |
| |
| base = dasd_device_from_gendisk(bdev->bd_disk); |
| if (!base) |
| return -ENODEV; |
| |
| if (!base->discipline || |
| !base->discipline->fill_geometry) { |
| dasd_put_device(base); |
| return -EINVAL; |
| } |
| base->discipline->fill_geometry(base->block, geo); |
| geo->start = get_start_sect(bdev) >> base->block->s2b_shift; |
| dasd_put_device(base); |
| return 0; |
| } |
| |
| const struct block_device_operations |
| dasd_device_operations = { |
| .owner = THIS_MODULE, |
| .open = dasd_open, |
| .release = dasd_release, |
| .ioctl = dasd_ioctl, |
| .compat_ioctl = dasd_ioctl, |
| .getgeo = dasd_getgeo, |
| }; |
| |
| /******************************************************************************* |
| * end of block device operations |
| */ |
| |
| 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; |
| } |
| dasd_statistics_removeroot(); |
| } |
| |
| /* |
| * SECTION: common functions for ccw_driver use |
| */ |
| |
| /* |
| * Is the device read-only? |
| * Note that this function does not report the setting of the |
| * readonly device attribute, but how it is configured in z/VM. |
| */ |
| int dasd_device_is_ro(struct dasd_device *device) |
| { |
| struct ccw_dev_id dev_id; |
| struct diag210 diag_data; |
| int rc; |
| |
| if (!MACHINE_IS_VM) |
| return 0; |
| ccw_device_get_id(device->cdev, &dev_id); |
| memset(&diag_data, 0, sizeof(diag_data)); |
| diag_data.vrdcdvno = dev_id.devno; |
| diag_data.vrdclen = sizeof(diag_data); |
| rc = diag210(&diag_data); |
| if (rc == 0 || rc == 2) { |
| return diag_data.vrdcvfla & 0x80; |
| } else { |
| DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", |
| dev_id.devno, rc); |
| return 0; |
| } |
| } |
| EXPORT_SYMBOL_GPL(dasd_device_is_ro); |
| |
| static void dasd_generic_auto_online(void *data, async_cookie_t cookie) |
| { |
| struct ccw_device *cdev = data; |
| int ret; |
| |
| ret = ccw_device_set_online(cdev); |
| if (ret) |
| pr_warn("%s: Setting the DASD online failed with rc=%d\n", |
| dev_name(&cdev->dev), ret); |
| } |
| |
| /* |
| * 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 = dasd_add_sysfs_files(cdev); |
| if (ret) { |
| DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", |
| "dasd_generic_probe: could not add " |
| "sysfs entries"); |
| 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(dev_name(&cdev->dev)) != 0)) |
| async_schedule(dasd_generic_auto_online, cdev); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_probe); |
| |
| /* |
| * 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; |
| struct dasd_block *block; |
| |
| cdev->handler = NULL; |
| |
| device = dasd_device_from_cdev(cdev); |
| if (IS_ERR(device)) { |
| dasd_remove_sysfs_files(cdev); |
| return; |
| } |
| if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) && |
| !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { |
| /* Already doing offline processing */ |
| dasd_put_device(device); |
| dasd_remove_sysfs_files(cdev); |
| 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. */ |
| block = device->block; |
| dasd_delete_device(device); |
| /* |
| * life cycle of block is bound to device, so delete it after |
| * device was safely removed |
| */ |
| if (block) |
| dasd_free_block(block); |
| |
| dasd_remove_sysfs_files(cdev); |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_remove); |
| |
| /* |
| * 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) { |
| pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n", |
| dev_name(&cdev->dev)); |
| 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; |
| |
| /* check_device will allocate block device if necessary */ |
| rc = discipline->check_device(device); |
| if (rc) { |
| pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n", |
| dev_name(&cdev->dev), 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) { |
| pr_warn("%s Setting the DASD online failed because of a missing discipline\n", |
| dev_name(&cdev->dev)); |
| rc = -ENODEV; |
| dasd_set_target_state(device, DASD_STATE_NEW); |
| if (device->block) |
| dasd_free_block(device->block); |
| dasd_delete_device(device); |
| } else |
| pr_debug("dasd_generic device %s found\n", |
| dev_name(&cdev->dev)); |
| |
| wait_event(dasd_init_waitq, _wait_for_device(device)); |
| |
| dasd_put_device(device); |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_set_online); |
| |
| int dasd_generic_set_offline(struct ccw_device *cdev) |
| { |
| struct dasd_device *device; |
| struct dasd_block *block; |
| int max_count, open_count, rc; |
| |
| rc = 0; |
| device = dasd_device_from_cdev(cdev); |
| if (IS_ERR(device)) |
| return PTR_ERR(device); |
| |
| /* |
| * 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. |
| */ |
| if (device->block) { |
| max_count = device->block->bdev ? 0 : -1; |
| open_count = atomic_read(&device->block->open_count); |
| if (open_count > max_count) { |
| if (open_count > 0) |
| pr_warn("%s: The DASD cannot be set offline with open count %i\n", |
| dev_name(&cdev->dev), open_count); |
| else |
| pr_warn("%s: The DASD cannot be set offline while it is in use\n", |
| dev_name(&cdev->dev)); |
| clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
| dasd_put_device(device); |
| return -EBUSY; |
| } |
| } |
| |
| if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { |
| /* |
| * safe offline already running |
| * could only be called by normal offline so safe_offline flag |
| * needs to be removed to run normal offline and kill all I/O |
| */ |
| if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { |
| /* Already doing normal offline processing */ |
| dasd_put_device(device); |
| return -EBUSY; |
| } else |
| clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); |
| |
| } else |
| if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { |
| /* Already doing offline processing */ |
| dasd_put_device(device); |
| return -EBUSY; |
| } |
| |
| /* |
| * if safe_offline called set safe_offline_running flag and |
| * clear safe_offline so that a call to normal offline |
| * can overrun safe_offline processing |
| */ |
| if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) && |
| !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { |
| /* |
| * If we want to set the device safe offline all IO operations |
| * should be finished before continuing the offline process |
| * so sync bdev first and then wait for our queues to become |
| * empty |
| */ |
| /* sync blockdev and partitions */ |
| rc = fsync_bdev(device->block->bdev); |
| if (rc != 0) |
| goto interrupted; |
| |
| /* schedule device tasklet and wait for completion */ |
| dasd_schedule_device_bh(device); |
| rc = wait_event_interruptible(shutdown_waitq, |
| _wait_for_empty_queues(device)); |
| if (rc != 0) |
| goto interrupted; |
| } |
| |
| set_bit(DASD_FLAG_OFFLINE, &device->flags); |
| dasd_set_target_state(device, DASD_STATE_NEW); |
| /* dasd_delete_device destroys the device reference. */ |
| block = device->block; |
| dasd_delete_device(device); |
| /* |
| * life cycle of block is bound to device, so delete it after |
| * device was safely removed |
| */ |
| if (block) |
| dasd_free_block(block); |
| return 0; |
| |
| interrupted: |
| /* interrupted by signal */ |
| clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); |
| clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags); |
| clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
| dasd_put_device(device); |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_set_offline); |
| |
| int dasd_generic_last_path_gone(struct dasd_device *device) |
| { |
| struct dasd_ccw_req *cqr; |
| |
| dev_warn(&device->cdev->dev, "No operational channel path is left " |
| "for the device\n"); |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone"); |
| /* First of all call extended error reporting. */ |
| dasd_eer_write(device, NULL, DASD_EER_NOPATH); |
| |
| if (device->state < DASD_STATE_BASIC) |
| return 0; |
| /* Device is active. We want to keep it. */ |
| list_for_each_entry(cqr, &device->ccw_queue, devlist) |
| if ((cqr->status == DASD_CQR_IN_IO) || |
| (cqr->status == DASD_CQR_CLEAR_PENDING)) { |
| cqr->status = DASD_CQR_QUEUED; |
| cqr->retries++; |
| } |
| dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); |
| dasd_device_clear_timer(device); |
| dasd_schedule_device_bh(device); |
| return 1; |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone); |
| |
| int dasd_generic_path_operational(struct dasd_device *device) |
| { |
| dev_info(&device->cdev->dev, "A channel path to the device has become " |
| "operational\n"); |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational"); |
| dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); |
| if (device->stopped & DASD_UNRESUMED_PM) { |
| dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); |
| dasd_restore_device(device); |
| return 1; |
| } |
| dasd_schedule_device_bh(device); |
| if (device->block) |
| dasd_schedule_block_bh(device->block); |
| return 1; |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_path_operational); |
| |
| int dasd_generic_notify(struct ccw_device *cdev, int event) |
| { |
| struct dasd_device *device; |
| int ret; |
| |
| device = dasd_device_from_cdev_locked(cdev); |
| if (IS_ERR(device)) |
| return 0; |
| ret = 0; |
| switch (event) { |
| case CIO_GONE: |
| case CIO_BOXED: |
| case CIO_NO_PATH: |
| device->path_data.opm = 0; |
| device->path_data.ppm = 0; |
| device->path_data.npm = 0; |
| ret = dasd_generic_last_path_gone(device); |
| break; |
| case CIO_OPER: |
| ret = 1; |
| if (device->path_data.opm) |
| ret = dasd_generic_path_operational(device); |
| break; |
| } |
| dasd_put_device(device); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_notify); |
| |
| void dasd_generic_path_event(struct ccw_device *cdev, int *path_event) |
| { |
| int chp; |
| __u8 oldopm, eventlpm; |
| struct dasd_device *device; |
| |
| device = dasd_device_from_cdev_locked(cdev); |
| if (IS_ERR(device)) |
| return; |
| for (chp = 0; chp < 8; chp++) { |
| eventlpm = 0x80 >> chp; |
| if (path_event[chp] & PE_PATH_GONE) { |
| oldopm = device->path_data.opm; |
| device->path_data.opm &= ~eventlpm; |
| device->path_data.ppm &= ~eventlpm; |
| device->path_data.npm &= ~eventlpm; |
| if (oldopm && !device->path_data.opm) { |
| dev_warn(&device->cdev->dev, |
| "No verified channel paths remain " |
| "for the device\n"); |
| DBF_DEV_EVENT(DBF_WARNING, device, |
| "%s", "last verified path gone"); |
| dasd_eer_write(device, NULL, DASD_EER_NOPATH); |
| dasd_device_set_stop_bits(device, |
| DASD_STOPPED_DC_WAIT); |
| } |
| } |
| if (path_event[chp] & PE_PATH_AVAILABLE) { |
| device->path_data.opm &= ~eventlpm; |
| device->path_data.ppm &= ~eventlpm; |
| device->path_data.npm &= ~eventlpm; |
| device->path_data.tbvpm |= eventlpm; |
| dasd_schedule_device_bh(device); |
| } |
| if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) { |
| if (!(device->path_data.opm & eventlpm) && |
| !(device->path_data.tbvpm & eventlpm)) { |
| /* |
| * we can not establish a pathgroup on an |
| * unavailable path, so trigger a path |
| * verification first |
| */ |
| device->path_data.tbvpm |= eventlpm; |
| dasd_schedule_device_bh(device); |
| } |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
| "Pathgroup re-established\n"); |
| if (device->discipline->kick_validate) |
| device->discipline->kick_validate(device); |
| } |
| } |
| dasd_put_device(device); |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_path_event); |
| |
| int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm) |
| { |
| if (!device->path_data.opm && lpm) { |
| device->path_data.opm = lpm; |
| dasd_generic_path_operational(device); |
| } else |
| device->path_data.opm |= lpm; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_verify_path); |
| |
| |
| int dasd_generic_pm_freeze(struct ccw_device *cdev) |
| { |
| struct dasd_device *device = dasd_device_from_cdev(cdev); |
| struct list_head freeze_queue; |
| struct dasd_ccw_req *cqr, *n; |
| struct dasd_ccw_req *refers; |
| int rc; |
| |
| if (IS_ERR(device)) |
| return PTR_ERR(device); |
| |
| /* mark device as suspended */ |
| set_bit(DASD_FLAG_SUSPENDED, &device->flags); |
| |
| if (device->discipline->freeze) |
| rc = device->discipline->freeze(device); |
| |
| /* disallow new I/O */ |
| dasd_device_set_stop_bits(device, DASD_STOPPED_PM); |
| |
| /* clear active requests and requeue them to block layer if possible */ |
| INIT_LIST_HEAD(&freeze_queue); |
| spin_lock_irq(get_ccwdev_lock(cdev)); |
| rc = 0; |
| list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
| /* Check status and move request to flush_queue */ |
| if (cqr->status == DASD_CQR_IN_IO) { |
| rc = device->discipline->term_IO(cqr); |
| if (rc) { |
| /* unable to terminate requeust */ |
| dev_err(&device->cdev->dev, |
| "Unable to terminate request %p " |
| "on suspend\n", cqr); |
| spin_unlock_irq(get_ccwdev_lock(cdev)); |
| dasd_put_device(device); |
| return rc; |
| } |
| } |
| list_move_tail(&cqr->devlist, &freeze_queue); |
| } |
| spin_unlock_irq(get_ccwdev_lock(cdev)); |
| |
| list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) { |
| wait_event(dasd_flush_wq, |
| (cqr->status != DASD_CQR_CLEAR_PENDING)); |
| if (cqr->status == DASD_CQR_CLEARED) |
| cqr->status = DASD_CQR_QUEUED; |
| |
| /* requeue requests to blocklayer will only work for |
| block device requests */ |
| if (_dasd_requeue_request(cqr)) |
| continue; |
| |
| /* remove requests from device and block queue */ |
| list_del_init(&cqr->devlist); |
| while (cqr->refers != NULL) { |
| refers = cqr->refers; |
| /* remove the request from the block queue */ |
| list_del(&cqr->blocklist); |
| /* free the finished erp request */ |
| dasd_free_erp_request(cqr, cqr->memdev); |
| cqr = refers; |
| } |
| if (cqr->block) |
| list_del_init(&cqr->blocklist); |
| cqr->block->base->discipline->free_cp( |
| cqr, (struct request *) cqr->callback_data); |
| } |
| |
| /* |
| * if requests remain then they are internal request |
| * and go back to the device queue |
| */ |
| if (!list_empty(&freeze_queue)) { |
| /* move freeze_queue to start of the ccw_queue */ |
| spin_lock_irq(get_ccwdev_lock(cdev)); |
| list_splice_tail(&freeze_queue, &device->ccw_queue); |
| spin_unlock_irq(get_ccwdev_lock(cdev)); |
| } |
| dasd_put_device(device); |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); |
| |
| int dasd_generic_restore_device(struct ccw_device *cdev) |
| { |
| struct dasd_device *device = dasd_device_from_cdev(cdev); |
| int rc = 0; |
| |
| if (IS_ERR(device)) |
| return PTR_ERR(device); |
| |
| /* allow new IO again */ |
| dasd_device_remove_stop_bits(device, |
| (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); |
| |
| dasd_schedule_device_bh(device); |
| |
| /* |
| * call discipline restore function |
| * if device is stopped do nothing e.g. for disconnected devices |
| */ |
| if (device->discipline->restore && !(device->stopped)) |
| rc = device->discipline->restore(device); |
| if (rc || device->stopped) |
| /* |
| * if the resume failed for the DASD we put it in |
| * an UNRESUMED stop state |
| */ |
| device->stopped |= DASD_UNRESUMED_PM; |
| |
| if (device->block) |
| dasd_schedule_block_bh(device->block); |
| |
| clear_bit(DASD_FLAG_SUSPENDED, &device->flags); |
| dasd_put_device(device); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_restore_device); |
| |
| static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
| void *rdc_buffer, |
| int rdc_buffer_size, |
| int magic) |
| { |
| struct dasd_ccw_req *cqr; |
| struct ccw1 *ccw; |
| unsigned long *idaw; |
| |
| cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); |
| |
| if (IS_ERR(cqr)) { |
| /* internal error 13 - Allocating the RDC request failed*/ |
| dev_err(&device->cdev->dev, |
| "An error occurred in the DASD device driver, " |
| "reason=%s\n", "13"); |
| return cqr; |
| } |
| |
| ccw = cqr->cpaddr; |
| ccw->cmd_code = CCW_CMD_RDC; |
| if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { |
| idaw = (unsigned long *) (cqr->data); |
| ccw->cda = (__u32)(addr_t) idaw; |
| ccw->flags = CCW_FLAG_IDA; |
| idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); |
| } else { |
| ccw->cda = (__u32)(addr_t) rdc_buffer; |
| ccw->flags = 0; |
| } |
| |
| ccw->count = rdc_buffer_size; |
| cqr->startdev = device; |
| cqr->memdev = device; |
| cqr->expires = 10*HZ; |
| cqr->retries = 256; |
| cqr->buildclk = get_tod_clock(); |
| cqr->status = DASD_CQR_FILLED; |
| return cqr; |
| } |
| |
| |
| int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, |
| void *rdc_buffer, int rdc_buffer_size) |
| { |
| int ret; |
| struct dasd_ccw_req *cqr; |
| |
| cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, |
| magic); |
| if (IS_ERR(cqr)) |
| return PTR_ERR(cqr); |
| |
| ret = dasd_sleep_on(cqr); |
| dasd_sfree_request(cqr, cqr->memdev); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
| |
| /* |
| * In command mode and transport mode we need to look for sense |
| * data in different places. The sense data itself is allways |
| * an array of 32 bytes, so we can unify the sense data access |
| * for both modes. |
| */ |
| char *dasd_get_sense(struct irb *irb) |
| { |
| struct tsb *tsb = NULL; |
| char *sense = NULL; |
| |
| if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { |
| if (irb->scsw.tm.tcw) |
| tsb = tcw_get_tsb((struct tcw *)(unsigned long) |
| irb->scsw.tm.tcw); |
| if (tsb && tsb->length == 64 && tsb->flags) |
| switch (tsb->flags & 0x07) { |
| case 1: /* tsa_iostat */ |
| sense = tsb->tsa.iostat.sense; |
| break; |
| case 2: /* tsa_ddpc */ |
| sense = tsb->tsa.ddpc.sense; |
| break; |
| default: |
| /* currently we don't use interrogate data */ |
| break; |
| } |
| } else if (irb->esw.esw0.erw.cons) { |
| sense = irb->ecw; |
| } |
| return sense; |
| } |
| EXPORT_SYMBOL_GPL(dasd_get_sense); |
| |
| void dasd_generic_shutdown(struct ccw_device *cdev) |
| { |
| struct dasd_device *device; |
| |
| device = dasd_device_from_cdev(cdev); |
| if (IS_ERR(device)) |
| return; |
| |
| if (device->block) |
| dasd_schedule_block_bh(device->block); |
| |
| dasd_schedule_device_bh(device); |
| |
| wait_event(shutdown_waitq, _wait_for_empty_queues(device)); |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_shutdown); |
| |
| static int __init dasd_init(void) |
| { |
| int rc; |
| |
| init_waitqueue_head(&dasd_init_waitq); |
| init_waitqueue_head(&dasd_flush_wq); |
| init_waitqueue_head(&generic_waitq); |
| init_waitqueue_head(&shutdown_waitq); |
| |
| /* register 'common' DASD debug area, used for all DBF_XXX calls */ |
| dasd_debug_area = debug_register("dasd", 1, 1, 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; |
| |
| dasd_statistics_createroot(); |
| |
| 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: |
| pr_info("The DASD device driver could not be initialized\n"); |
| dasd_exit(); |
| return rc; |
| } |
| |
| module_init(dasd_init); |
| module_exit(dasd_exit); |