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- // 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 if (likely(!blk_should_fake_timeout(req->q))) {
- 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.)
- */
- /*
- * Dasd request queue function. Called from ll_rw_blk.c
- */
- static blk_status_t do_dasd_request(struct blk_mq_hw_ctx *hctx,
- const struct blk_mq_queue_data *qd)
- {
- struct dasd_block *block = hctx->queue->queuedata;
- struct dasd_queue *dq = hctx->driver_data;
- struct request *req = qd->rq;
- struct dasd_device *basedev;
- struct dasd_ccw_req *cqr;
- blk_status_t rc = BLK_STS_OK;
- basedev = block->base;
- spin_lock_irq(&dq->lock);
- if (basedev->state < DASD_STATE_READY ||
- test_bit(DASD_FLAG_OFFLINE, &basedev->flags)) {
- DBF_DEV_EVENT(DBF_ERR, basedev,
- "device not ready for request %p", req);
- rc = BLK_STS_IOERR;
- goto out;
- }
- /*
- * if device is stopped do not fetch new requests
- * except failfast is active which will let requests fail
- * immediately in __dasd_block_start_head()
- */
- if (basedev->stopped && !(basedev->features & DASD_FEATURE_FAILFAST)) {
- DBF_DEV_EVENT(DBF_ERR, basedev,
- "device stopped request %p", req);
- rc = BLK_STS_RESOURCE;
- goto out;
- }
- if (basedev->features & DASD_FEATURE_READONLY &&
- rq_data_dir(req) == WRITE) {
- DBF_DEV_EVENT(DBF_ERR, basedev,
- "Rejecting write request %p", req);
- rc = BLK_STS_IOERR;
- goto out;
- }
- 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);
- rc = BLK_STS_IOERR;
- goto out;
- }
- cqr = basedev->discipline->build_cp(basedev, block, req);
- if (IS_ERR(cqr)) {
- if (PTR_ERR(cqr) == -EBUSY ||
- PTR_ERR(cqr) == -ENOMEM ||
- PTR_ERR(cqr) == -EAGAIN) {
- rc = BLK_STS_RESOURCE;
- goto out;
- }
- DBF_DEV_EVENT(DBF_ERR, basedev,
- "CCW creation failed (rc=%ld) on request %p",
- PTR_ERR(cqr), req);
- rc = BLK_STS_IOERR;
- goto out;
- }
- /*
- * Note: callback is set to dasd_return_cqr_cb in
- * __dasd_block_start_head to cover erp requests as well
- */
- cqr->callback_data = req;
- cqr->status = DASD_CQR_FILLED;
- cqr->dq = dq;
- blk_mq_start_request(req);
- spin_lock(&block->queue_lock);
- list_add_tail(&cqr->blocklist, &block->ccw_queue);
- INIT_LIST_HEAD(&cqr->devlist);
- dasd_profile_start(block, cqr, req);
- dasd_schedule_block_bh(block);
- spin_unlock(&block->queue_lock);
- out:
- spin_unlock_irq(&dq->lock);
- return rc;
- }
- /*
- * Block timeout callback, called from the block layer
- *
- * Return values:
- * BLK_EH_RESET_TIMER if the request should be left running
- * BLK_EH_DONE if the request is handled or terminated
- * by the driver.
- */
- enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved)
- {
- struct dasd_block *block = req->q->queuedata;
- struct dasd_device *device;
- struct dasd_ccw_req *cqr;
- unsigned long flags;
- int rc = 0;
- cqr = blk_mq_rq_to_pdu(req);
- if (!cqr)
- return BLK_EH_DONE;
- spin_lock_irqsave(&cqr->dq->lock, flags);
- device = cqr->startdev ? cqr->startdev : block->base;
- if (!device->blk_timeout) {
- spin_unlock_irqrestore(&cqr->dq->lock, flags);
- 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) {
- rc = __dasd_cancel_req(cqr);
- } else if (cqr->status == DASD_CQR_FILLED ||
- cqr->status == DASD_CQR_NEED_ERP) {
- cqr->status = DASD_CQR_TERMINATED;
- } 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) {
- rc = __dasd_cancel_req(searchcqr);
- } 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);
- spin_unlock_irqrestore(&cqr->dq->lock, flags);
- return rc ? BLK_EH_RESET_TIMER : BLK_EH_DONE;
- }
- static int dasd_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
- unsigned int idx)
- {
- struct dasd_queue *dq = kzalloc(sizeof(*dq), GFP_KERNEL);
- if (!dq)
- return -ENOMEM;
- spin_lock_init(&dq->lock);
- hctx->driver_data = dq;
- return 0;
- }
- static void dasd_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int idx)
- {
- kfree(hctx->driver_data);
- hctx->driver_data = NULL;
- }
- static void dasd_request_done(struct request *req)
- {
- blk_mq_end_request(req, 0);
- blk_mq_run_hw_queues(req->q, true);
- }
- static struct blk_mq_ops dasd_mq_ops = {
- .queue_rq = do_dasd_request,
- .complete = dasd_request_done,
- .timeout = dasd_times_out,
- .init_hctx = dasd_init_hctx,
- .exit_hctx = dasd_exit_hctx,
- };
- /*
- * Allocate and initialize request queue and default I/O scheduler.
- */
- static int dasd_alloc_queue(struct dasd_block *block)
- {
- int rc;
- block->tag_set.ops = &dasd_mq_ops;
- block->tag_set.cmd_size = sizeof(struct dasd_ccw_req);
- block->tag_set.nr_hw_queues = nr_hw_queues;
- block->tag_set.queue_depth = queue_depth;
- block->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
- block->tag_set.numa_node = NUMA_NO_NODE;
- rc = blk_mq_alloc_tag_set(&block->tag_set);
- if (rc)
- return rc;
- block->request_queue = blk_mq_init_queue(&block->tag_set);
- if (IS_ERR(block->request_queue))
- return PTR_ERR(block->request_queue);
- block->request_queue->queuedata = block;
- return 0;
- }
- /*
- * Deactivate and free request queue.
- */
- static void dasd_free_queue(struct dasd_block *block)
- {
- if (block->request_queue) {
- blk_cleanup_queue(block->request_queue);
- blk_mq_free_tag_set(&block->tag_set);
- block->request_queue = NULL;
- }
- }
- 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();
- 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);
- void dasd_generic_free_discipline(struct dasd_device *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;
- }
- }
- EXPORT_SYMBOL_GPL(dasd_generic_free_discipline);
- /*
- * 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;
- 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);
- cdev->handler = NULL;
- /* 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) {
- /* Try to load the required module. */
- rc = request_module(DASD_DIAG_MOD);
- if (rc) {
- pr_warn("%s Setting the DASD online failed "
- "because the required module %s "
- "could not be loaded (rc=%d)\n",
- dev_name(&cdev->dev), DASD_DIAG_MOD,
- rc);
- dasd_delete_device(device);
- return -ENODEV;
- }
- }
- /* Module init could have failed, so check again here after
- * request_module(). */
- 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;
- unsigned long flags;
- rc = 0;
- spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
- device = dasd_device_from_cdev_locked(cdev);
- if (IS_ERR(device)) {
- spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
- 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));
- rc = -EBUSY;
- goto out_err;
- }
- }
- /*
- * Test if the offline processing is already running and exit if so.
- * If a safe offline is being processed this could only be a normal
- * offline that should be able to overtake the safe offline and
- * cancel any I/O we do not want to wait for any longer
- */
- if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
- if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
- clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING,
- &device->flags);
- } else {
- rc = -EBUSY;
- goto out_err;
- }
- }
- set_bit(DASD_FLAG_OFFLINE, &device->flags);
- /*
- * if safe_offline is 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)) {
- /* need to unlock here to wait for outstanding I/O */
- spin_unlock_irqrestore(get_ccwdev_lock(cdev), 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
- */
- if (device->block) {
- rc = fsync_bdev(device->block->bdev);
- if (rc != 0)
- goto interrupted;
- }
- dasd_schedule_device_bh(device);
- rc = wait_event_interruptible(shutdown_waitq,
- _wait_for_empty_queues(device));
- if (rc != 0)
- goto interrupted;
- /*
- * check if a normal offline process overtook the offline
- * processing in this case simply do nothing beside returning
- * that we got interrupted
- * otherwise mark safe offline as not running any longer and
- * continue with normal offline
- */
- spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
- if (!test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
- rc = -ERESTARTSYS;
- goto out_err;
- }
- clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
- }
- spin_unlock_irqrestore(get_ccwdev_lock(cdev), 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 */
- spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
- clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
- clear_bit(DASD_FLAG_OFFLINE, &device->flags);
- out_err:
- dasd_put_device(device);
- spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
- 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);
- if (device->block->request_queue)
- blk_mq_run_hw_queues(device->block->request_queue,
- true);
- }
- if (!device->stopped)
- wake_up(&generic_waitq);
- 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:
- dasd_path_no_path(device);
- ret = dasd_generic_last_path_gone(device);
- break;
- case CIO_OPER:
- ret = 1;
- if (dasd_path_get_opm(device))
- 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)
- {
- struct dasd_device *device;
- int chp, oldopm, hpfpm, ifccpm;
- device = dasd_device_from_cdev_locked(cdev);
- if (IS_ERR(device))
- return;
- oldopm = dasd_path_get_opm(device);
- for (chp = 0; chp < 8; chp++) {
- if (path_event[chp] & PE_PATH_GONE) {
- dasd_path_notoper(device, chp);
- }
- if (path_event[chp] & PE_PATH_AVAILABLE) {
- dasd_path_available(device, chp);
- dasd_schedule_device_bh(device);
- }
- if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
- if (!dasd_path_is_operational(device, chp) &&
- !dasd_path_need_verify(device, chp)) {
- /*
- * we can not establish a pathgroup on an
- * unavailable path, so trigger a path
- * verification first
- */
- dasd_path_available(device, chp);
- 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);
- }
- }
- hpfpm = dasd_path_get_hpfpm(device);
- ifccpm = dasd_path_get_ifccpm(device);
- if (!dasd_path_get_opm(device) && hpfpm) {
- /*
- * device has no operational paths but at least one path is
- * disabled due to HPF errors
- * disable HPF at all and use the path(s) again
- */
- if (device->discipline->disable_hpf)
- device->discipline->disable_hpf(device);
- dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
- dasd_path_set_tbvpm(device, hpfpm);
- dasd_schedule_device_bh(device);
- dasd_schedule_requeue(device);
- } else if (!dasd_path_get_opm(device) && ifccpm) {
- /*
- * device has no operational paths but at least one path is
- * disabled due to IFCC errors
- * trigger path verification on paths with IFCC errors
- */
- dasd_path_set_tbvpm(device, ifccpm);
- dasd_schedule_device_bh(device);
- }
- if (oldopm && !dasd_path_get_opm(device) && !hpfpm && !ifccpm) {
- 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);
- }
- dasd_put_device(device);
- }
- EXPORT_SYMBOL_GPL(dasd_generic_path_event);
- int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
- {
- if (!dasd_path_get_opm(device) && lpm) {
- dasd_path_set_opm(device, lpm);
- dasd_generic_path_operational(device);
- } else
- dasd_path_add_opm(device, lpm);
- return 0;
- }
- EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
- void dasd_generic_space_exhaust(struct dasd_device *device,
- struct dasd_ccw_req *cqr)
- {
- dasd_eer_write(device, NULL, DASD_EER_NOSPC);
- if (device->state < DASD_STATE_BASIC)
- return;
- 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_NOSPC);
- dasd_device_clear_timer(device);
- dasd_schedule_device_bh(device);
- }
- EXPORT_SYMBOL_GPL(dasd_generic_space_exhaust);
- void dasd_generic_space_avail(struct dasd_device *device)
- {
- dev_info(&device->cdev->dev, "Extent pool space is available\n");
- DBF_DEV_EVENT(DBF_WARNING, device, "%s", "space available");
- dasd_device_remove_stop_bits(device, DASD_STOPPED_NOSPC);
- 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);
- }
- if (!device->stopped)
- wake_up(&generic_waitq);
- }
- EXPORT_SYMBOL_GPL(dasd_generic_space_avail);
- /*
- * clear active requests and requeue them to block layer if possible
- */
- static int dasd_generic_requeue_all_requests(struct dasd_device *device)
- {
- struct list_head requeue_queue;
- struct dasd_ccw_req *cqr, *n;
- struct dasd_ccw_req *refers;
- int rc;
- INIT_LIST_HEAD(&requeue_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 */
- 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(device->cdev));
- dasd_put_device(device);
- return rc;
- }
- }
- list_move_tail(&cqr->devlist, &requeue_queue);
- }
- spin_unlock_irq(get_ccwdev_lock(device->cdev));
- list_for_each_entry_safe(cqr, n, &requeue_queue, devlist) {
- wait_event(dasd_flush_wq,
- (cqr->status != DASD_CQR_CLEAR_PENDING));
- /*
- * 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;
- }
- /*
- * _dasd_requeue_request already checked for a valid
- * blockdevice, no need to check again
- * all erp requests (cqr->refers) have a cqr->block
- * pointer copy from the original cqr
- */
- 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(&requeue_queue)) {
- /* move freeze_queue to start of the ccw_queue */
- spin_lock_irq(get_ccwdev_lock(device->cdev));
- list_splice_tail(&requeue_queue, &device->ccw_queue);
- spin_unlock_irq(get_ccwdev_lock(device->cdev));
- }
- dasd_schedule_device_bh(device);
- return rc;
- }
- static void do_requeue_requests(struct work_struct *work)
- {
- struct dasd_device *device = container_of(work, struct dasd_device,
- requeue_requests);
- dasd_generic_requeue_all_requests(device);
- dasd_device_remove_stop_bits(device, DASD_STOPPED_NOT_ACC);
- if (device->block)
- dasd_schedule_block_bh(device->block);
- dasd_put_device(device);
- }
- void dasd_schedule_requeue(struct dasd_device *device)
- {
- dasd_get_device(device);
- /* queue call to dasd_reload_device to the kernel event daemon. */
- if (!schedule_work(&device->requeue_requests))
- dasd_put_device(device);
- }
- EXPORT_SYMBOL(dasd_schedule_requeue);
- int dasd_generic_pm_freeze(struct ccw_device *cdev)
- {
- struct dasd_device *device = dasd_device_from_cdev(cdev);
- if (IS_ERR(device))
- return PTR_ERR(device);
- /* mark device as suspended */
- set_bit(DASD_FLAG_SUSPENDED, &device->flags);
- if (device->discipline->freeze)
- device->discipline->freeze(device);
- /* disallow new I/O */
- dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
- return dasd_generic_requeue_all_requests(device);
- }
- 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);
- if (device->block->request_queue)
- blk_mq_run_hw_queues(device->block->request_queue,
- true);
- }
- 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,
- int rdc_buffer_size,
- int magic)
- {
- struct dasd_ccw_req *cqr;
- struct ccw1 *ccw;
- cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device,
- NULL);
- 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;
- ccw->cda = (__u32)(addr_t) cqr->data;
- 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_size, magic);
- if (IS_ERR(cqr))
- return PTR_ERR(cqr);
- ret = dasd_sleep_on(cqr);
- if (ret == 0)
- memcpy(rdc_buffer, cqr->data, rdc_buffer_size);
- 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);
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