| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * 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 |
| |
| #define DASD_DIAG_MOD "dasd_diag_mod" |
| |
| static unsigned int queue_depth = 32; |
| static unsigned int nr_hw_queues = 4; |
| |
| module_param(queue_depth, uint, 0444); |
| MODULE_PARM_DESC(queue_depth, "Default queue depth for new DASD devices"); |
| |
| module_param(nr_hw_queues, uint, 0444); |
| MODULE_PARM_DESC(nr_hw_queues, "Default number of hardware queues for new DASD devices"); |
| |
| /* |
| * 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_free_queue(struct dasd_block *); |
| static int dasd_flush_block_queue(struct dasd_block *); |
| static void dasd_device_tasklet(unsigned long); |
| static void dasd_block_tasklet(unsigned long); |
| 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 do_requeue_requests(struct work_struct *); |
| static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
| static void dasd_device_timeout(struct timer_list *); |
| static void dasd_block_timeout(struct timer_list *); |
| 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 *); |
| static void dasd_hosts_init(struct dentry *, struct dasd_device *); |
| static void dasd_hosts_exit(struct dasd_device *); |
| |
| /* |
| * 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); |
| } |
| /* Get two pages for ese format. */ |
| device->ese_mem = (void *)__get_free_pages(GFP_ATOMIC | GFP_DMA, 1); |
| if (!device->ese_mem) { |
| free_page((unsigned long) 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); |
| dasd_init_chunklist(&device->ese_chunks, device->ese_mem, PAGE_SIZE * 2); |
| spin_lock_init(&device->mem_lock); |
| atomic_set(&device->tasklet_scheduled, 0); |
| tasklet_init(&device->tasklet, dasd_device_tasklet, |
| (unsigned long) device); |
| INIT_LIST_HEAD(&device->ccw_queue); |
| timer_setup(&device->timer, dasd_device_timeout, 0); |
| INIT_WORK(&device->kick_work, do_kick_device); |
| INIT_WORK(&device->restore_device, do_restore_device); |
| INIT_WORK(&device->reload_device, do_reload_device); |
| INIT_WORK(&device->requeue_requests, do_requeue_requests); |
| 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_pages((unsigned long) device->ese_mem, 1); |
| 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); |
| |
| atomic_set(&block->tasklet_scheduled, 0); |
| tasklet_init(&block->tasklet, dasd_block_tasklet, |
| (unsigned long) block); |
| INIT_LIST_HEAD(&block->ccw_queue); |
| spin_lock_init(&block->queue_lock); |
| INIT_LIST_HEAD(&block->format_list); |
| spin_lock_init(&block->format_lock); |
| timer_setup(&block->timer, dasd_block_timeout, 0); |
| 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); |
| 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); |
| dasd_hosts_init(device->debugfs_dentry, device); |
| |
| /* 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->discipline->basic_to_known) { |
| rc = device->discipline->basic_to_known(device); |
| if (rc) |
| return 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); |
| dasd_hosts_exit(device); |
| 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; |
| struct gendisk *disk; |
| |
| 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; |
| disk = device->block->gdp; |
| kobject_uevent(&disk_to_dev(disk)->kobj, |
| KOBJ_CHANGE); |
| goto out; |
| } |
| return rc; |
| } |
| if (device->discipline->setup_blk_queue) |
| device->discipline->setup_blk_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; |
| |
| 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_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. */ |
| if (!schedule_work(&device->kick_work)) |
| dasd_put_device(device); |
| } |
| 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. */ |
| if (!schedule_work(&device->reload_device)) |
| dasd_put_device(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. */ |
| if (!schedule_work(&device->restore_device)) |
| dasd_put_device(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 dasd_global_profile = { |
| .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock), |
| }; |
| 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; |
| |
| spin_lock(&dasd_global_profile.lock); |
| if (dasd_global_profile.data) { |
| 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_unlock(&dasd_global_profile.lock); |
| |
| 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)); |
| ktime_get_real_ts64(&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) |
| { |
| unsigned long strtime, irqtime, endtime, tottime; |
| unsigned long tottimeps, sectors; |
| struct dasd_device *device; |
| int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind; |
| int irqtime_ind, irqtimeps_ind, endtime_ind; |
| struct dasd_profile_info *data; |
| |
| 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); |
| |
| spin_lock(&dasd_global_profile.lock); |
| if (dasd_global_profile.data) { |
| data = dasd_global_profile.data; |
| data->dasd_sum_times += tottime; |
| data->dasd_sum_time_str += strtime; |
| data->dasd_sum_time_irq += irqtime; |
| data->dasd_sum_time_end += endtime; |
| 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_unlock(&dasd_global_profile.lock); |
| |
| spin_lock(&block->profile.lock); |
| if (block->profile.data) { |
| data = block->profile.data; |
| data->dasd_sum_times += tottime; |
| data->dasd_sum_time_str += strtime; |
| data->dasd_sum_time_irq += irqtime; |
| data->dasd_sum_time_end += endtime; |
| 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) { |
| data = device->profile.data; |
| data->dasd_sum_times += tottime; |
| data->dasd_sum_time_str += strtime; |
| data->dasd_sum_time_irq += irqtime; |
| data->dasd_sum_time_end += endtime; |
| 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)); |
| ktime_get_real_ts64(&data->starttod); |
| spin_unlock_bh(&profile->lock); |
| } |
| |
| 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; |
| } |
| ktime_get_real_ts64(&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) |
| goto out; |
| rc = user_len; |
| if (prof == &dasd_global_profile) { |
| dasd_profile_reset(prof); |
| dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; |
| } |
| } else if (strncmp(str, "off", 3) == 0) { |
| if (prof == &dasd_global_profile) |
| dasd_global_profile_level = DASD_PROFILE_OFF; |
| dasd_profile_off(prof); |
| } else |
| rc = -EINVAL; |
| out: |
| 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 %lld.%09ld\n", |
| (s64)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, "avg_total %lu\n", data->dasd_io_reqs ? |
| data->dasd_sum_times / data->dasd_io_reqs : 0UL); |
| seq_printf(m, "avg_build_to_ssch %lu\n", data->dasd_io_reqs ? |
| data->dasd_sum_time_str / data->dasd_io_reqs : 0UL); |
| seq_printf(m, "avg_ssch_to_irq %lu\n", data->dasd_io_reqs ? |
| data->dasd_sum_time_irq / data->dasd_io_reqs : 0UL); |
| seq_printf(m, "avg_irq_to_end %lu\n", data->dasd_io_reqs ? |
| data->dasd_sum_time_end / data->dasd_io_reqs : 0UL); |
| seq_puts(m, "histogram_sectors "); |
| dasd_stats_array(m, data->dasd_io_secs); |
| seq_puts(m, "histogram_io_times "); |
| dasd_stats_array(m, data->dasd_io_times); |
| seq_puts(m, "histogram_io_times_weighted "); |
| dasd_stats_array(m, data->dasd_io_timps); |
| seq_puts(m, "histogram_time_build_to_ssch "); |
| dasd_stats_array(m, data->dasd_io_time1); |
| seq_puts(m, "histogram_time_ssch_to_irq "); |
| dasd_stats_array(m, data->dasd_io_time2); |
| seq_puts(m, "histogram_time_ssch_to_irq_weighted "); |
| dasd_stats_array(m, data->dasd_io_time2ps); |
| seq_puts(m, "histogram_time_irq_to_end "); |
| dasd_stats_array(m, data->dasd_io_time3); |
| seq_puts(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_puts(m, "histogram_read_sectors "); |
| dasd_stats_array(m, data->dasd_read_secs); |
| seq_puts(m, "histogram_read_times "); |
| dasd_stats_array(m, data->dasd_read_times); |
| seq_puts(m, "histogram_read_time_build_to_ssch "); |
| dasd_stats_array(m, data->dasd_read_time1); |
| seq_puts(m, "histogram_read_time_ssch_to_irq "); |
| dasd_stats_array(m, data->dasd_read_time2); |
| seq_puts(m, "histogram_read_time_irq_to_end "); |
| dasd_stats_array(m, data->dasd_read_time3); |
| seq_puts(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_puts(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 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; |
| dasd_profile_exit(&dasd_global_profile); |
| debugfs_remove(dasd_debugfs_global_entry); |
| debugfs_remove(dasd_debugfs_root_entry); |
| } |
| |
| static void dasd_statistics_createroot(void) |
| { |
| struct dentry *pde; |
| |
| dasd_debugfs_root_entry = 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; |
| dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry); |
| 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_puts(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 */ |
| |
| static int dasd_hosts_show(struct seq_file *m, void *v) |
| { |
| struct dasd_device *device; |
| int rc = -EOPNOTSUPP; |
| |
| device = m->private; |
| dasd_get_device(device); |
| |
| if (device->discipline->hosts_print) |
| rc = device->discipline->hosts_print(device, m); |
| |
| dasd_put_device(device); |
| return rc; |
| } |
| |
| DEFINE_SHOW_ATTRIBUTE(dasd_hosts); |
| |
| static void dasd_hosts_exit(struct dasd_device *device) |
| { |
| debugfs_remove(device->hosts_dentry); |
| device->hosts_dentry = NULL; |
| } |
| |
| static void dasd_hosts_init(struct dentry *base_dentry, |
| struct dasd_device *device) |
| { |
| struct dentry *pde; |
| umode_t mode; |
| |
| if (!base_dentry) |
| return; |
| |
| mode = S_IRUSR | S_IFREG; |
| pde = debugfs_create_file("host_access_list", mode, base_dentry, |
| device, &dasd_hosts_fops); |
| if (pde && !IS_ERR(pde)) |
| device->hosts_dentry = pde; |
| } |
| |
| struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, int datasize, |
| struct dasd_device *device, |
| struct dasd_ccw_req *cqr) |
| { |
| unsigned long flags; |
| char *data, *chunk; |
| int size = 0; |
| |
| if (cplength > 0) |
| size += cplength * sizeof(struct ccw1); |
| if (datasize > 0) |
| size += datasize; |
| if (!cqr) |
| size += (sizeof(*cqr) + 7L) & -8L; |
| |
| spin_lock_irqsave(&device->mem_lock, flags); |
| data = chunk = dasd_alloc_chunk(&device->ccw_chunks, size); |
| spin_unlock_irqrestore(&device->mem_lock, flags); |
| if (!chunk) |
| return ERR_PTR(-ENOMEM); |
| if (!cqr) { |
| cqr = (void *) data; |
| data += (sizeof(*cqr) + 7L) & -8L; |
| } |
| memset(cqr, 0, sizeof(*cqr)); |
| cqr->mem_chunk = chunk; |
| if (cplength > 0) { |
| cqr->cpaddr = data; |
| data += cplength * sizeof(struct ccw1); |
| memset(cqr->cpaddr, 0, cplength * sizeof(struct ccw1)); |
| } |
| 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); |
| |
| struct dasd_ccw_req *dasd_fmalloc_request(int magic, int cplength, |
| int datasize, |
| struct dasd_device *device) |
| { |
| struct dasd_ccw_req *cqr; |
| unsigned long flags; |
| int size, cqr_size; |
| char *data; |
| |
| cqr_size = (sizeof(*cqr) + 7L) & -8L; |
| size = cqr_size; |
| if (cplength > 0) |
| size += cplength * sizeof(struct ccw1); |
| if (datasize > 0) |
| size += datasize; |
| |
| spin_lock_irqsave(&device->mem_lock, flags); |
| cqr = dasd_alloc_chunk(&device->ese_chunks, size); |
| spin_unlock_irqrestore(&device->mem_lock, flags); |
| if (!cqr) |
| return ERR_PTR(-ENOMEM); |
| memset(cqr, 0, sizeof(*cqr)); |
| data = (char *)cqr + cqr_size; |
| cqr->cpaddr = NULL; |
| if (cplength > 0) { |
| cqr->cpaddr = 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_fmalloc_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->mem_chunk); |
| spin_unlock_irqrestore(&device->mem_lock, flags); |
| dasd_put_device(device); |
| } |
| EXPORT_SYMBOL(dasd_sfree_request); |
| |
| void dasd_ffree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&device->mem_lock, flags); |
| dasd_free_chunk(&device->ese_chunks, cqr); |
| spin_unlock_irqrestore(&device->mem_lock, flags); |
| dasd_put_device(device); |
| } |
| EXPORT_SYMBOL(dasd_ffree_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 -EINVAL: |
| /* |
| * device not valid so no I/O could be running |
| * handle CQR as termination successful |
| */ |
| cqr->status = DASD_CQR_CLEARED; |
| cqr->stopclk = get_tod_clock(); |
| cqr->starttime = 0; |
| /* no retries for invalid devices */ |
| cqr->retries = -1; |
| DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| "EINVAL, handle as terminated"); |
| /* fake rc to success */ |
| rc = 0; |
| 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 &= dasd_path_get_opm(device); |
| if (!cqr->lpm) |
| cqr->lpm = dasd_path_get_opm(device); |
| } |
| 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 -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 != dasd_path_get_opm(device)) { |
| cqr->lpm = dasd_path_get_opm(device); |
| 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); |
| dasd_path_no_path(device); |
| dasd_path_set_tbvpm(device, |
| 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(struct timer_list *t) |
| { |
| unsigned long flags; |
| struct dasd_device *device; |
| |
| device = from_timer(device, t, timer); |
| 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); |
| if (device->block->request_queue) |
| blk_mq_run_hw_queues(device->block->request_queue, |
| true); |
| } |
| } |
| EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
| |
| static int dasd_check_hpf_error(struct irb *irb) |
| { |
| return (scsw_tm_is_valid_schxs(&irb->scsw) && |
| (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX || |
| irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX)); |
| } |
| |
| static int dasd_ese_needs_format(struct dasd_block *block, struct irb *irb) |
| { |
| struct dasd_device *device = NULL; |
| u8 *sense = NULL; |
| |
| if (!block) |
| return 0; |
| device = block->base; |
| if (!device || !device->discipline->is_ese) |
| return 0; |
| if (!device->discipline->is_ese(device)) |
| return 0; |
| |
| sense = dasd_get_sense(irb); |
| if (!sense) |
| return 0; |
| |
| return !!(sense[1] & SNS1_NO_REC_FOUND) || |
| !!(sense[1] & SNS1_FILE_PROTECTED) || |
| scsw_cstat(&irb->scsw) == SCHN_STAT_INCORR_LEN; |
| } |
| |
| static int dasd_ese_oos_cond(u8 *sense) |
| { |
| return sense[0] & SNS0_EQUIPMENT_CHECK && |
| sense[1] & SNS1_PERM_ERR && |
| sense[1] & SNS1_WRITE_INHIBITED && |
| sense[25] == 0x01; |
| } |
| |
| /* |
| * 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, *fcqr; |
| struct dasd_device *device; |
| unsigned long now; |
| int nrf_suppressed = 0; |
| int fp_suppressed = 0; |
| u8 *sense = NULL; |
| int expires; |
| |
| cqr = (struct dasd_ccw_req *) intparm; |
| if (IS_ERR(irb)) { |
| switch (PTR_ERR(irb)) { |
| case -EIO: |
| if (cqr && cqr->status == DASD_CQR_CLEAR_PENDING) { |
| device = cqr->startdev; |
| cqr->status = DASD_CQR_CLEARED; |
| dasd_device_clear_timer(device); |
| wake_up(&dasd_flush_wq); |
| dasd_schedule_device_bh(device); |
| return; |
| } |
| 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(); |
| /* 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; |
| } |
| |
| /* |
| * In some cases 'File Protected' or 'No Record Found' errors |
| * might be expected and debug log messages for the |
| * corresponding interrupts shouldn't be written then. |
| * Check if either of the according suppress bits is set. |
| */ |
| sense = dasd_get_sense(irb); |
| if (sense) { |
| fp_suppressed = (sense[1] & SNS1_FILE_PROTECTED) && |
| test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags); |
| nrf_suppressed = (sense[1] & SNS1_NO_REC_FOUND) && |
| test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags); |
| |
| /* |
| * Extent pool probably out-of-space. |
| * Stop device and check exhaust level. |
| */ |
| if (dasd_ese_oos_cond(sense)) { |
| dasd_generic_space_exhaust(device, cqr); |
| device->discipline->ext_pool_exhaust(device, cqr); |
| dasd_put_device(device); |
| return; |
| } |
| } |
| if (!(fp_suppressed || nrf_suppressed)) |
| 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); |
| } |
| |
| /* check for for attention message */ |
| if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) { |
| device = dasd_device_from_cdev_locked(cdev); |
| if (!IS_ERR(device)) { |
| device->discipline->check_attention(device, |
| irb->esw.esw1.lpum); |
| 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; |
| } |
| |
| if (dasd_ese_needs_format(cqr->block, irb)) { |
| if (rq_data_dir((struct request *)cqr->callback_data) == READ) { |
| device->discipline->ese_read(cqr, irb); |
| cqr->status = DASD_CQR_SUCCESS; |
| cqr->stopclk = now; |
| dasd_device_clear_timer(device); |
| dasd_schedule_device_bh(device); |
| return; |
| } |
| fcqr = device->discipline->ese_format(device, cqr, irb); |
| if (IS_ERR(fcqr)) { |
| if (PTR_ERR(fcqr) == -EINVAL) { |
| cqr->status = DASD_CQR_ERROR; |
| return; |
| } |
| /* |
| * If we can't format now, let the request go |
| * one extra round. Maybe we can format later. |
| */ |
| cqr->status = DASD_CQR_QUEUED; |
| dasd_schedule_device_bh(device); |
| return; |
| } else { |
| fcqr->status = DASD_CQR_QUEUED; |
| cqr->status = DASD_CQR_QUEUED; |
| list_add(&fcqr->devlist, &device->ccw_queue); |
| dasd_schedule_device_bh(device); |
| 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 */ |
| /* check for HPF error |
| * call discipline function to requeue all requests |
| * and disable HPF accordingly |
| */ |
| if (cqr->cpmode && dasd_check_hpf_error(irb) && |
| device->discipline->handle_hpf_error) |
| device->discipline->handle_hpf_error(device, irb); |
| /* |
| * 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 == dasd_path_get_opm(device)) |
| 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 = dasd_path_get_opm(device); |
| 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); |
| } |
| } |
| |
| static void __dasd_process_cqr(struct dasd_device *device, |
| struct dasd_ccw_req *cqr) |
| { |
| char errorstring[ERRORLENGTH]; |
| |
| 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) |
| cqr->callback(cqr, cqr->callback_data); |
| } |
| |
| /* |
| * 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; |
| |
| 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; |
| if (!block) { |
| __dasd_process_cqr(device, cqr); |
| } else { |
| spin_lock_bh(&block->queue_lock); |
| __dasd_process_cqr(device, cqr); |
| 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); |
| } |
| } |
| } |
| |
| /* |
| * return 1 when device is not eligible for IO |
| */ |
| static int __dasd_device_is_unusable(struct dasd_device *device, |
| struct dasd_ccw_req *cqr) |
| { |
| int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM | DASD_STOPPED_NOSPC); |
| |
| if (test_bit(DASD_FLAG_OFFLINE, &device->flags) && |
| !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { |
| /* |
| * dasd is being set offline |
| * but it is no safe offline where we have to allow I/O |
| */ |
| return 1; |
| } |
| if (device->stopped) { |
| if (device->stopped & mask) { |
| /* stopped and CQR will not change that. */ |
| return 1; |
| } |
| if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { |
| /* CQR is not able to change device to |
| * operational. */ |
| return 1; |
| } |
| /* CQR required to get device operational. */ |
| } |
| return 0; |
| } |
| |
| /* |
| * 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; |
| /* if device is not usable return request to upper layer */ |
| if (__dasd_device_is_unusable(device, cqr)) { |
| 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 (!dasd_path_get_tbvpm(device)) |
| return; |
| |
| if (device->stopped & |
| ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM)) |
| return; |
| rc = device->discipline->verify_path(device, |
| dasd_path_get_tbvpm(device)); |
| if (rc) |
| dasd_device_set_timer(device, 50); |
| else |
| dasd_path_clear_all_verify(device); |
| }; |
| |
| /* |
| * 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(unsigned long data) |
| { |
| struct dasd_device *device = (struct dasd_device *) data; |
| 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 in |
| * offline processing, it might wait forever |
| */ |
| if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { |
| cqr->status = DASD_CQR_FAILED; |
| cqr->intrc = -ENODEV; |
| continue; |
| } |
| /* |
| * Don't try to start requests if device is stopped |
| * except path verification requests |
| */ |
| if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { |
| 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; |
| struct dasd_ccw_req *cqr, *n; |
| u8 *sense = NULL; |
| int rc; |
| |
| 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) { |
| /* |
| * In some cases the 'File Protected' or 'Incorrect Length' |
| * error might be expected and error recovery would be |
| * unnecessary in these cases. Check if the according suppress |
| * bit is set. |
| */ |
| sense = dasd_get_sense(&cqr->irb); |
| if (sense && sense[1] & SNS1_FILE_PROTECTED && |
| test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags)) |
| continue; |
| if (scsw_cstat(&cqr->irb.scsw) == 0x40 && |
| test_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags)) |
| continue; |
| |
| /* |
| * for alias devices simplify error recovery and |
| * return to upper layer |
| * do not skip ERP requests |
| */ |
| if (cqr->startdev != cqr->basedev && !cqr->refers && |
| (cqr->status == DASD_CQR_TERMINATED || |
| cqr->status == DASD_CQR_NEED_ERP)) |
| return -EAGAIN; |
| |
| /* normal recovery for basedev IO */ |
| if (__dasd_sleep_on_erp(cqr)) |
| /* handle erp first */ |
| 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); |
| |
| /* |
| * Start requests from a ccw_queue and wait interruptible for their completion. |
| */ |
| int dasd_sleep_on_queue_interruptible(struct list_head *ccw_queue) |
| { |
| return _dasd_sleep_on_queue(ccw_queue, 1); |
| } |
| EXPORT_SYMBOL(dasd_sleep_on_queue_interruptible); |
| |
| /* |
| * 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. |
| */ |
| static int __dasd_cancel_req(struct dasd_ccw_req *cqr) |
| { |
| struct dasd_device *device = cqr->startdev; |
| int rc = 0; |
| |
| 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; |
| } |
| dasd_schedule_device_bh(device); |
| return rc; |
| } |
| |
| int dasd_cancel_req(struct dasd_ccw_req *cqr) |
| { |
| struct dasd_device *device = cqr->startdev; |
| unsigned long flags; |
| int rc; |
| |
| spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
| rc = __dasd_cancel_req(cqr); |
| spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| return rc; |
| } |
| |
| /* |
| * 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(struct timer_list *t) |
| { |
| unsigned long flags; |
| struct dasd_block *block; |
| |
| block = from_timer(block, t, timer); |
| 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); |
| blk_mq_run_hw_queues(block->request_queue, true); |
| } |
| |
| /* |
| * 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); |
| } |
| |
| static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) |
| { |
| struct request *req; |
| blk_status_t error = BLK_STS_OK; |
| unsigned int proc_bytes; |
| int status; |
| |
| req = (struct request *) cqr->callback_data; |
| dasd_profile_end(cqr->block, cqr, req); |
| |
| proc_bytes = cqr->proc_bytes; |
| status = cqr->block->base->discipline->free_cp(cqr, req); |
| if (status < 0) |
| error = errno_to_blk_status(status); |
| else if (status == 0) { |
| switch (cqr->intrc) { |
| case -EPERM: |
| error = BLK_STS_NEXUS; |
| break; |
| case -ENOLINK: |
| error = BLK_STS_TRANSPORT; |
| break; |
| case -ETIMEDOUT: |
| error = BLK_STS_TIMEOUT; |
| break; |
| default: |
| error = BLK_STS_IOERR; |
| break; |
| } |
| } |
| |
| /* |
| * We need to take care for ETIMEDOUT errors here since the |
| * complete callback does not get called in this case. |
| * Take care of all errors here and avoid additional code to |
| * transfer the error value to the complete callback. |
| */ |
| if (error) { |
| blk_mq_end_request(req, error); |
| blk_mq_run_hw_queues(req->q, true); |
| } else { |
| /* |
| * Partial completed requests can happen with ESE devices. |
| * During read we might have gotten a NRF error and have to |
| * complete a request partially. |
| */ |
| if (proc_bytes) { |
| blk_update_request(req, BLK_STS_OK, |
| blk_rq_bytes(req) - proc_bytes); |
| blk_mq_requeue_request(req, true); |
| } else { |
| blk_mq_complete_request(req); |
| } |
| } |
| } |
| |
| /* |
| * 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(unsigned long data) |
| { |
| struct dasd_block *block = (struct dasd_block *) data; |
| struct list_head final_queue; |
| struct list_head *l, *n; |
| struct dasd_ccw_req *cqr; |
| struct dasd_queue *dq; |
| |
| atomic_set(&block->tasklet_scheduled, 0); |
| INIT_LIST_HEAD(&final_queue); |
| spin_lock_irq(&block->queue_lock); |
| /* Finish off requests on ccw queue */ |
| __dasd_process_block_ccw_queue(block, &final_queue); |
| spin_unlock_irq(&block->queue_lock); |
| |
| /* Now call the callback function of requests with final status */ |
| list_for_each_safe(l, n, &final_queue) { |
| cqr = list_entry(l, struct dasd_ccw_req, blocklist); |
| dq = cqr->dq; |
| spin_lock_irq(&dq->lock); |
| list_del_init(&cqr->blocklist); |
| __dasd_cleanup_cqr(cqr); |
| spin_unlock_irq(&dq->lock); |
| } |
| |
| spin_lock_irq(&block->queue_lock); |
| /* Now check if the head of the ccw queue needs to be started. */ |
| __dasd_block_start_head(block); |
| spin_unlock_irq(&block->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; |
| |
| if (!block) |
| return -EINVAL; |
| /* |
| * If the request is an ERP request there is nothing to requeue. |
| * This will be done with the remaining original request. |
| */ |
| if (cqr->refers) |
| return 0; |
| spin_lock_irq(&cqr->dq->lock); |
| req = (struct request *) cqr->callback_data; |
| blk_mq_requeue_request(req, false); |
| spin_unlock_irq(&cqr->dq->lock); |
| |
| 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; |
| unsigned long flags; |
| |
| 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_irqsave(&cqr->dq->lock, flags); |
| cqr->endclk = get_tod_clock(); |
| list_del_init(&cqr->blocklist); |
| __dasd_cleanup_cqr(cqr); |
| spin_unlock_irqrestore(&cqr->dq->lock, flags); |
| } |
| 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.) |
| */ |
|