forked from Minki/linux
214b8ffc20
After terminating a request in the dasd_sleep_on_immediatly function, wait for the clear interrupt to be received before starting the new request. This prevents the requests from getting mixed up. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
3547 lines
94 KiB
C
3547 lines
94 KiB
C
/*
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* File...........: linux/drivers/s390/block/dasd.c
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* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
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* Horst Hummel <Horst.Hummel@de.ibm.com>
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* Carsten Otte <Cotte@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Bugreports.to..: <Linux390@de.ibm.com>
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* Copyright IBM Corp. 1999, 2009
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*/
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#define KMSG_COMPONENT "dasd"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kmod.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/ctype.h>
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#include <linux/major.h>
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#include <linux/slab.h>
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#include <linux/buffer_head.h>
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#include <linux/hdreg.h>
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#include <linux/async.h>
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#include <linux/mutex.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/vmalloc.h>
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#include <asm/ccwdev.h>
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#include <asm/ebcdic.h>
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#include <asm/idals.h>
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#include <asm/itcw.h>
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#include <asm/diag.h>
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/* This is ugly... */
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#define PRINTK_HEADER "dasd:"
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#include "dasd_int.h"
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/*
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* SECTION: Constant definitions to be used within this file
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*/
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#define DASD_CHANQ_MAX_SIZE 4
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#define DASD_SLEEPON_START_TAG (void *) 1
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#define DASD_SLEEPON_END_TAG (void *) 2
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/*
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* SECTION: exported variables of dasd.c
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*/
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debug_info_t *dasd_debug_area;
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static struct dentry *dasd_debugfs_root_entry;
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struct dasd_discipline *dasd_diag_discipline_pointer;
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void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
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MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
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MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
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" Copyright 2000 IBM Corporation");
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MODULE_SUPPORTED_DEVICE("dasd");
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MODULE_LICENSE("GPL");
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/*
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* SECTION: prototypes for static functions of dasd.c
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*/
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static int dasd_alloc_queue(struct dasd_block *);
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static void dasd_setup_queue(struct dasd_block *);
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static void dasd_free_queue(struct dasd_block *);
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static void dasd_flush_request_queue(struct dasd_block *);
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static int dasd_flush_block_queue(struct dasd_block *);
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static void dasd_device_tasklet(struct dasd_device *);
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static void dasd_block_tasklet(struct dasd_block *);
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static void do_kick_device(struct work_struct *);
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static void do_restore_device(struct work_struct *);
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static void do_reload_device(struct work_struct *);
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static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
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static void dasd_device_timeout(unsigned long);
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static void dasd_block_timeout(unsigned long);
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static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
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static void dasd_profile_init(struct dasd_profile *, struct dentry *);
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static void dasd_profile_exit(struct dasd_profile *);
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/*
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* SECTION: Operations on the device structure.
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*/
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static wait_queue_head_t dasd_init_waitq;
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static wait_queue_head_t dasd_flush_wq;
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static wait_queue_head_t generic_waitq;
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/*
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* Allocate memory for a new device structure.
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*/
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struct dasd_device *dasd_alloc_device(void)
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{
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struct dasd_device *device;
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device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
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if (!device)
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return ERR_PTR(-ENOMEM);
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/* Get two pages for normal block device operations. */
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device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
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if (!device->ccw_mem) {
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kfree(device);
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return ERR_PTR(-ENOMEM);
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}
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/* Get one page for error recovery. */
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device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
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if (!device->erp_mem) {
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free_pages((unsigned long) device->ccw_mem, 1);
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kfree(device);
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return ERR_PTR(-ENOMEM);
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}
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dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
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dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
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spin_lock_init(&device->mem_lock);
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atomic_set(&device->tasklet_scheduled, 0);
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tasklet_init(&device->tasklet,
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(void (*)(unsigned long)) dasd_device_tasklet,
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(unsigned long) device);
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INIT_LIST_HEAD(&device->ccw_queue);
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init_timer(&device->timer);
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device->timer.function = dasd_device_timeout;
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device->timer.data = (unsigned long) device;
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INIT_WORK(&device->kick_work, do_kick_device);
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INIT_WORK(&device->restore_device, do_restore_device);
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INIT_WORK(&device->reload_device, do_reload_device);
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device->state = DASD_STATE_NEW;
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device->target = DASD_STATE_NEW;
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mutex_init(&device->state_mutex);
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spin_lock_init(&device->profile.lock);
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return device;
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}
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/*
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* Free memory of a device structure.
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*/
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void dasd_free_device(struct dasd_device *device)
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{
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kfree(device->private);
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free_page((unsigned long) device->erp_mem);
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free_pages((unsigned long) device->ccw_mem, 1);
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kfree(device);
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}
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/*
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* Allocate memory for a new device structure.
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*/
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struct dasd_block *dasd_alloc_block(void)
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{
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struct dasd_block *block;
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block = kzalloc(sizeof(*block), GFP_ATOMIC);
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if (!block)
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return ERR_PTR(-ENOMEM);
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/* open_count = 0 means device online but not in use */
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atomic_set(&block->open_count, -1);
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spin_lock_init(&block->request_queue_lock);
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atomic_set(&block->tasklet_scheduled, 0);
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tasklet_init(&block->tasklet,
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(void (*)(unsigned long)) dasd_block_tasklet,
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(unsigned long) block);
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INIT_LIST_HEAD(&block->ccw_queue);
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spin_lock_init(&block->queue_lock);
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init_timer(&block->timer);
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block->timer.function = dasd_block_timeout;
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block->timer.data = (unsigned long) block;
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spin_lock_init(&block->profile.lock);
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return block;
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}
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/*
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* Free memory of a device structure.
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*/
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void dasd_free_block(struct dasd_block *block)
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{
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kfree(block);
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}
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/*
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* Make a new device known to the system.
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*/
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static int dasd_state_new_to_known(struct dasd_device *device)
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{
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int rc;
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/*
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* As long as the device is not in state DASD_STATE_NEW we want to
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* keep the reference count > 0.
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*/
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dasd_get_device(device);
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if (device->block) {
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rc = dasd_alloc_queue(device->block);
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if (rc) {
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dasd_put_device(device);
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return rc;
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}
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}
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device->state = DASD_STATE_KNOWN;
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return 0;
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}
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/*
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* Let the system forget about a device.
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*/
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static int dasd_state_known_to_new(struct dasd_device *device)
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{
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/* Disable extended error reporting for this device. */
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dasd_eer_disable(device);
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/* Forget the discipline information. */
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if (device->discipline) {
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if (device->discipline->uncheck_device)
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device->discipline->uncheck_device(device);
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module_put(device->discipline->owner);
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}
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device->discipline = NULL;
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if (device->base_discipline)
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module_put(device->base_discipline->owner);
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device->base_discipline = NULL;
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device->state = DASD_STATE_NEW;
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if (device->block)
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dasd_free_queue(device->block);
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/* Give up reference we took in dasd_state_new_to_known. */
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dasd_put_device(device);
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return 0;
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}
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static struct dentry *dasd_debugfs_setup(const char *name,
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struct dentry *base_dentry)
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{
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struct dentry *pde;
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if (!base_dentry)
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return NULL;
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pde = debugfs_create_dir(name, base_dentry);
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if (!pde || IS_ERR(pde))
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return NULL;
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return pde;
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}
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/*
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* Request the irq line for the device.
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*/
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static int dasd_state_known_to_basic(struct dasd_device *device)
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{
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struct dasd_block *block = device->block;
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int rc;
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/* Allocate and register gendisk structure. */
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if (block) {
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rc = dasd_gendisk_alloc(block);
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if (rc)
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return rc;
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block->debugfs_dentry =
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dasd_debugfs_setup(block->gdp->disk_name,
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dasd_debugfs_root_entry);
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dasd_profile_init(&block->profile, block->debugfs_dentry);
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if (dasd_global_profile_level == DASD_PROFILE_ON)
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dasd_profile_on(&device->block->profile);
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}
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device->debugfs_dentry =
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dasd_debugfs_setup(dev_name(&device->cdev->dev),
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dasd_debugfs_root_entry);
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dasd_profile_init(&device->profile, device->debugfs_dentry);
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/* register 'device' debug area, used for all DBF_DEV_XXX calls */
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device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
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8 * sizeof(long));
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debug_register_view(device->debug_area, &debug_sprintf_view);
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debug_set_level(device->debug_area, DBF_WARNING);
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DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
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device->state = DASD_STATE_BASIC;
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return 0;
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}
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/*
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* Release the irq line for the device. Terminate any running i/o.
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*/
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static int dasd_state_basic_to_known(struct dasd_device *device)
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{
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int rc;
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if (device->block) {
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dasd_profile_exit(&device->block->profile);
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if (device->block->debugfs_dentry)
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debugfs_remove(device->block->debugfs_dentry);
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dasd_gendisk_free(device->block);
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dasd_block_clear_timer(device->block);
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}
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rc = dasd_flush_device_queue(device);
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if (rc)
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return rc;
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dasd_device_clear_timer(device);
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dasd_profile_exit(&device->profile);
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if (device->debugfs_dentry)
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debugfs_remove(device->debugfs_dentry);
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DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
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if (device->debug_area != NULL) {
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debug_unregister(device->debug_area);
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device->debug_area = NULL;
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}
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device->state = DASD_STATE_KNOWN;
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return 0;
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}
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/*
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* Do the initial analysis. The do_analysis function may return
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* -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
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* until the discipline decides to continue the startup sequence
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* by calling the function dasd_change_state. The eckd disciplines
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* uses this to start a ccw that detects the format. The completion
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* interrupt for this detection ccw uses the kernel event daemon to
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* trigger the call to dasd_change_state. All this is done in the
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* discipline code, see dasd_eckd.c.
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* After the analysis ccw is done (do_analysis returned 0) the block
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* device is setup.
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* In case the analysis returns an error, the device setup is stopped
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* (a fake disk was already added to allow formatting).
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*/
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static int dasd_state_basic_to_ready(struct dasd_device *device)
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{
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int rc;
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struct dasd_block *block;
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rc = 0;
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block = device->block;
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/* make disk known with correct capacity */
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if (block) {
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if (block->base->discipline->do_analysis != NULL)
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rc = block->base->discipline->do_analysis(block);
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if (rc) {
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if (rc != -EAGAIN)
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device->state = DASD_STATE_UNFMT;
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return rc;
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}
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dasd_setup_queue(block);
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set_capacity(block->gdp,
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block->blocks << block->s2b_shift);
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device->state = DASD_STATE_READY;
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rc = dasd_scan_partitions(block);
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if (rc)
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device->state = DASD_STATE_BASIC;
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} else {
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device->state = DASD_STATE_READY;
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}
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return rc;
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}
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/*
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* Remove device from block device layer. Destroy dirty buffers.
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* Forget format information. Check if the target level is basic
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* and if it is create fake disk for formatting.
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*/
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static int dasd_state_ready_to_basic(struct dasd_device *device)
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{
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int rc;
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device->state = DASD_STATE_BASIC;
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if (device->block) {
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struct dasd_block *block = device->block;
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rc = dasd_flush_block_queue(block);
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if (rc) {
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device->state = DASD_STATE_READY;
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return rc;
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}
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dasd_flush_request_queue(block);
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dasd_destroy_partitions(block);
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block->blocks = 0;
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block->bp_block = 0;
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block->s2b_shift = 0;
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}
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return 0;
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}
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/*
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* Back to basic.
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*/
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static int dasd_state_unfmt_to_basic(struct dasd_device *device)
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{
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device->state = DASD_STATE_BASIC;
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return 0;
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}
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/*
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* Make the device online and schedule the bottom half to start
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* the requeueing of requests from the linux request queue to the
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* ccw queue.
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*/
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static int
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dasd_state_ready_to_online(struct dasd_device * device)
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{
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int rc;
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struct gendisk *disk;
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struct disk_part_iter piter;
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struct hd_struct *part;
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if (device->discipline->ready_to_online) {
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rc = device->discipline->ready_to_online(device);
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if (rc)
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return rc;
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}
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device->state = DASD_STATE_ONLINE;
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if (device->block) {
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dasd_schedule_block_bh(device->block);
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if ((device->features & DASD_FEATURE_USERAW)) {
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disk = device->block->gdp;
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kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
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return 0;
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}
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disk = device->block->bdev->bd_disk;
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disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
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while ((part = disk_part_iter_next(&piter)))
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kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
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disk_part_iter_exit(&piter);
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}
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return 0;
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}
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/*
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* Stop the requeueing of requests again.
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*/
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static int dasd_state_online_to_ready(struct dasd_device *device)
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{
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int rc;
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struct gendisk *disk;
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struct disk_part_iter piter;
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struct hd_struct *part;
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if (device->discipline->online_to_ready) {
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rc = device->discipline->online_to_ready(device);
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if (rc)
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return rc;
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}
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device->state = DASD_STATE_READY;
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if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
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disk = device->block->bdev->bd_disk;
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disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
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while ((part = disk_part_iter_next(&piter)))
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kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
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disk_part_iter_exit(&piter);
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}
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return 0;
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}
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/*
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* Device startup state changes.
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*/
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static int dasd_increase_state(struct dasd_device *device)
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{
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int rc;
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rc = 0;
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if (device->state == DASD_STATE_NEW &&
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device->target >= DASD_STATE_KNOWN)
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rc = dasd_state_new_to_known(device);
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if (!rc &&
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device->state == DASD_STATE_KNOWN &&
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device->target >= DASD_STATE_BASIC)
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rc = dasd_state_known_to_basic(device);
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if (!rc &&
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device->state == DASD_STATE_BASIC &&
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device->target >= DASD_STATE_READY)
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rc = dasd_state_basic_to_ready(device);
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if (!rc &&
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device->state == DASD_STATE_UNFMT &&
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device->target > DASD_STATE_UNFMT)
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rc = -EPERM;
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if (!rc &&
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device->state == DASD_STATE_READY &&
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device->target >= DASD_STATE_ONLINE)
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rc = dasd_state_ready_to_online(device);
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return rc;
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}
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/*
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* Device shutdown state changes.
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*/
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static int dasd_decrease_state(struct dasd_device *device)
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{
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int rc;
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rc = 0;
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if (device->state == DASD_STATE_ONLINE &&
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device->target <= DASD_STATE_READY)
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rc = dasd_state_online_to_ready(device);
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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;
|
|
|
|
if (device->state == device->target)
|
|
wake_up(&dasd_init_waitq);
|
|
|
|
/* let user-space know that the device status changed */
|
|
kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
|
|
}
|
|
|
|
/*
|
|
* Kick starter for devices that did not complete the startup/shutdown
|
|
* procedure or were sleeping because of a pending state.
|
|
* dasd_kick_device will schedule a call do do_kick_device to the kernel
|
|
* event daemon.
|
|
*/
|
|
static void do_kick_device(struct work_struct *work)
|
|
{
|
|
struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
|
|
mutex_lock(&device->state_mutex);
|
|
dasd_change_state(device);
|
|
mutex_unlock(&device->state_mutex);
|
|
dasd_schedule_device_bh(device);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
void dasd_kick_device(struct dasd_device *device)
|
|
{
|
|
dasd_get_device(device);
|
|
/* queue call to dasd_kick_device to the kernel event daemon. */
|
|
schedule_work(&device->kick_work);
|
|
}
|
|
|
|
/*
|
|
* dasd_reload_device will schedule a call do do_reload_device to the kernel
|
|
* event daemon.
|
|
*/
|
|
static void do_reload_device(struct work_struct *work)
|
|
{
|
|
struct dasd_device *device = container_of(work, struct dasd_device,
|
|
reload_device);
|
|
device->discipline->reload(device);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
void dasd_reload_device(struct dasd_device *device)
|
|
{
|
|
dasd_get_device(device);
|
|
/* queue call to dasd_reload_device to the kernel event daemon. */
|
|
schedule_work(&device->reload_device);
|
|
}
|
|
EXPORT_SYMBOL(dasd_reload_device);
|
|
|
|
/*
|
|
* dasd_restore_device will schedule a call do do_restore_device to the kernel
|
|
* event daemon.
|
|
*/
|
|
static void do_restore_device(struct work_struct *work)
|
|
{
|
|
struct dasd_device *device = container_of(work, struct dasd_device,
|
|
restore_device);
|
|
device->cdev->drv->restore(device->cdev);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
void dasd_restore_device(struct dasd_device *device)
|
|
{
|
|
dasd_get_device(device);
|
|
/* queue call to dasd_restore_device to the kernel event daemon. */
|
|
schedule_work(&device->restore_device);
|
|
}
|
|
|
|
/*
|
|
* Set the target state for a device and starts the state change.
|
|
*/
|
|
void dasd_set_target_state(struct dasd_device *device, int target)
|
|
{
|
|
dasd_get_device(device);
|
|
mutex_lock(&device->state_mutex);
|
|
/* If we are in probeonly mode stop at DASD_STATE_READY. */
|
|
if (dasd_probeonly && target > DASD_STATE_READY)
|
|
target = DASD_STATE_READY;
|
|
if (device->target != target) {
|
|
if (device->state == target)
|
|
wake_up(&dasd_init_waitq);
|
|
device->target = target;
|
|
}
|
|
if (device->state != device->target)
|
|
dasd_change_state(device);
|
|
mutex_unlock(&device->state_mutex);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
/*
|
|
* Enable devices with device numbers in [from..to].
|
|
*/
|
|
static inline int _wait_for_device(struct dasd_device *device)
|
|
{
|
|
return (device->state == device->target);
|
|
}
|
|
|
|
void dasd_enable_device(struct dasd_device *device)
|
|
{
|
|
dasd_set_target_state(device, DASD_STATE_ONLINE);
|
|
if (device->state <= DASD_STATE_KNOWN)
|
|
/* No discipline for device found. */
|
|
dasd_set_target_state(device, DASD_STATE_NEW);
|
|
/* Now wait for the devices to come up. */
|
|
wait_event(dasd_init_waitq, _wait_for_device(device));
|
|
}
|
|
|
|
/*
|
|
* SECTION: device operation (interrupt handler, start i/o, term i/o ...)
|
|
*/
|
|
|
|
unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
|
|
|
|
#ifdef CONFIG_DASD_PROFILE
|
|
struct dasd_profile_info dasd_global_profile_data;
|
|
static struct dentry *dasd_global_profile_dentry;
|
|
static struct dentry *dasd_debugfs_global_entry;
|
|
|
|
/*
|
|
* Add profiling information for cqr before execution.
|
|
*/
|
|
static void dasd_profile_start(struct dasd_block *block,
|
|
struct dasd_ccw_req *cqr,
|
|
struct request *req)
|
|
{
|
|
struct list_head *l;
|
|
unsigned int counter;
|
|
struct dasd_device *device;
|
|
|
|
/* count the length of the chanq for statistics */
|
|
counter = 0;
|
|
if (dasd_global_profile_level || block->profile.data)
|
|
list_for_each(l, &block->ccw_queue)
|
|
if (++counter >= 31)
|
|
break;
|
|
|
|
if (dasd_global_profile_level) {
|
|
dasd_global_profile_data.dasd_io_nr_req[counter]++;
|
|
if (rq_data_dir(req) == READ)
|
|
dasd_global_profile_data.dasd_read_nr_req[counter]++;
|
|
}
|
|
|
|
spin_lock(&block->profile.lock);
|
|
if (block->profile.data)
|
|
block->profile.data->dasd_io_nr_req[counter]++;
|
|
if (rq_data_dir(req) == READ)
|
|
block->profile.data->dasd_read_nr_req[counter]++;
|
|
spin_unlock(&block->profile.lock);
|
|
|
|
/*
|
|
* We count the request for the start device, even though it may run on
|
|
* some other device due to error recovery. This way we make sure that
|
|
* we count each request only once.
|
|
*/
|
|
device = cqr->startdev;
|
|
if (device->profile.data) {
|
|
counter = 1; /* request is not yet queued on the start device */
|
|
list_for_each(l, &device->ccw_queue)
|
|
if (++counter >= 31)
|
|
break;
|
|
}
|
|
spin_lock(&device->profile.lock);
|
|
if (device->profile.data) {
|
|
device->profile.data->dasd_io_nr_req[counter]++;
|
|
if (rq_data_dir(req) == READ)
|
|
device->profile.data->dasd_read_nr_req[counter]++;
|
|
}
|
|
spin_unlock(&device->profile.lock);
|
|
}
|
|
|
|
/*
|
|
* Add profiling information for cqr after execution.
|
|
*/
|
|
|
|
#define dasd_profile_counter(value, index) \
|
|
{ \
|
|
for (index = 0; index < 31 && value >> (2+index); index++) \
|
|
; \
|
|
}
|
|
|
|
static void dasd_profile_end_add_data(struct dasd_profile_info *data,
|
|
int is_alias,
|
|
int is_tpm,
|
|
int is_read,
|
|
long sectors,
|
|
int sectors_ind,
|
|
int tottime_ind,
|
|
int tottimeps_ind,
|
|
int strtime_ind,
|
|
int irqtime_ind,
|
|
int irqtimeps_ind,
|
|
int endtime_ind)
|
|
{
|
|
/* in case of an overflow, reset the whole profile */
|
|
if (data->dasd_io_reqs == UINT_MAX) {
|
|
memset(data, 0, sizeof(*data));
|
|
getnstimeofday(&data->starttod);
|
|
}
|
|
data->dasd_io_reqs++;
|
|
data->dasd_io_sects += sectors;
|
|
if (is_alias)
|
|
data->dasd_io_alias++;
|
|
if (is_tpm)
|
|
data->dasd_io_tpm++;
|
|
|
|
data->dasd_io_secs[sectors_ind]++;
|
|
data->dasd_io_times[tottime_ind]++;
|
|
data->dasd_io_timps[tottimeps_ind]++;
|
|
data->dasd_io_time1[strtime_ind]++;
|
|
data->dasd_io_time2[irqtime_ind]++;
|
|
data->dasd_io_time2ps[irqtimeps_ind]++;
|
|
data->dasd_io_time3[endtime_ind]++;
|
|
|
|
if (is_read) {
|
|
data->dasd_read_reqs++;
|
|
data->dasd_read_sects += sectors;
|
|
if (is_alias)
|
|
data->dasd_read_alias++;
|
|
if (is_tpm)
|
|
data->dasd_read_tpm++;
|
|
data->dasd_read_secs[sectors_ind]++;
|
|
data->dasd_read_times[tottime_ind]++;
|
|
data->dasd_read_time1[strtime_ind]++;
|
|
data->dasd_read_time2[irqtime_ind]++;
|
|
data->dasd_read_time3[endtime_ind]++;
|
|
}
|
|
}
|
|
|
|
static void dasd_profile_end(struct dasd_block *block,
|
|
struct dasd_ccw_req *cqr,
|
|
struct request *req)
|
|
{
|
|
long strtime, irqtime, endtime, tottime; /* in microseconds */
|
|
long tottimeps, sectors;
|
|
struct dasd_device *device;
|
|
int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
|
|
int irqtime_ind, irqtimeps_ind, endtime_ind;
|
|
|
|
device = cqr->startdev;
|
|
if (!(dasd_global_profile_level ||
|
|
block->profile.data ||
|
|
device->profile.data))
|
|
return;
|
|
|
|
sectors = blk_rq_sectors(req);
|
|
if (!cqr->buildclk || !cqr->startclk ||
|
|
!cqr->stopclk || !cqr->endclk ||
|
|
!sectors)
|
|
return;
|
|
|
|
strtime = ((cqr->startclk - cqr->buildclk) >> 12);
|
|
irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
|
|
endtime = ((cqr->endclk - cqr->stopclk) >> 12);
|
|
tottime = ((cqr->endclk - cqr->buildclk) >> 12);
|
|
tottimeps = tottime / sectors;
|
|
|
|
dasd_profile_counter(sectors, sectors_ind);
|
|
dasd_profile_counter(tottime, tottime_ind);
|
|
dasd_profile_counter(tottimeps, tottimeps_ind);
|
|
dasd_profile_counter(strtime, strtime_ind);
|
|
dasd_profile_counter(irqtime, irqtime_ind);
|
|
dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
|
|
dasd_profile_counter(endtime, endtime_ind);
|
|
|
|
if (dasd_global_profile_level) {
|
|
dasd_profile_end_add_data(&dasd_global_profile_data,
|
|
cqr->startdev != block->base,
|
|
cqr->cpmode == 1,
|
|
rq_data_dir(req) == READ,
|
|
sectors, sectors_ind, tottime_ind,
|
|
tottimeps_ind, strtime_ind,
|
|
irqtime_ind, irqtimeps_ind,
|
|
endtime_ind);
|
|
}
|
|
|
|
spin_lock(&block->profile.lock);
|
|
if (block->profile.data)
|
|
dasd_profile_end_add_data(block->profile.data,
|
|
cqr->startdev != block->base,
|
|
cqr->cpmode == 1,
|
|
rq_data_dir(req) == READ,
|
|
sectors, sectors_ind, tottime_ind,
|
|
tottimeps_ind, strtime_ind,
|
|
irqtime_ind, irqtimeps_ind,
|
|
endtime_ind);
|
|
spin_unlock(&block->profile.lock);
|
|
|
|
spin_lock(&device->profile.lock);
|
|
if (device->profile.data)
|
|
dasd_profile_end_add_data(device->profile.data,
|
|
cqr->startdev != block->base,
|
|
cqr->cpmode == 1,
|
|
rq_data_dir(req) == READ,
|
|
sectors, sectors_ind, tottime_ind,
|
|
tottimeps_ind, strtime_ind,
|
|
irqtime_ind, irqtimeps_ind,
|
|
endtime_ind);
|
|
spin_unlock(&device->profile.lock);
|
|
}
|
|
|
|
void dasd_profile_reset(struct dasd_profile *profile)
|
|
{
|
|
struct dasd_profile_info *data;
|
|
|
|
spin_lock_bh(&profile->lock);
|
|
data = profile->data;
|
|
if (!data) {
|
|
spin_unlock_bh(&profile->lock);
|
|
return;
|
|
}
|
|
memset(data, 0, sizeof(*data));
|
|
getnstimeofday(&data->starttod);
|
|
spin_unlock_bh(&profile->lock);
|
|
}
|
|
|
|
void dasd_global_profile_reset(void)
|
|
{
|
|
memset(&dasd_global_profile_data, 0, sizeof(dasd_global_profile_data));
|
|
getnstimeofday(&dasd_global_profile_data.starttod);
|
|
}
|
|
|
|
int dasd_profile_on(struct dasd_profile *profile)
|
|
{
|
|
struct dasd_profile_info *data;
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
spin_lock_bh(&profile->lock);
|
|
if (profile->data) {
|
|
spin_unlock_bh(&profile->lock);
|
|
kfree(data);
|
|
return 0;
|
|
}
|
|
getnstimeofday(&data->starttod);
|
|
profile->data = data;
|
|
spin_unlock_bh(&profile->lock);
|
|
return 0;
|
|
}
|
|
|
|
void dasd_profile_off(struct dasd_profile *profile)
|
|
{
|
|
spin_lock_bh(&profile->lock);
|
|
kfree(profile->data);
|
|
profile->data = NULL;
|
|
spin_unlock_bh(&profile->lock);
|
|
}
|
|
|
|
char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
|
|
{
|
|
char *buffer;
|
|
|
|
buffer = vmalloc(user_len + 1);
|
|
if (buffer == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (copy_from_user(buffer, user_buf, user_len) != 0) {
|
|
vfree(buffer);
|
|
return ERR_PTR(-EFAULT);
|
|
}
|
|
/* got the string, now strip linefeed. */
|
|
if (buffer[user_len - 1] == '\n')
|
|
buffer[user_len - 1] = 0;
|
|
else
|
|
buffer[user_len] = 0;
|
|
return buffer;
|
|
}
|
|
|
|
static ssize_t dasd_stats_write(struct file *file,
|
|
const char __user *user_buf,
|
|
size_t user_len, loff_t *pos)
|
|
{
|
|
char *buffer, *str;
|
|
int rc;
|
|
struct seq_file *m = (struct seq_file *)file->private_data;
|
|
struct dasd_profile *prof = m->private;
|
|
|
|
if (user_len > 65536)
|
|
user_len = 65536;
|
|
buffer = dasd_get_user_string(user_buf, user_len);
|
|
if (IS_ERR(buffer))
|
|
return PTR_ERR(buffer);
|
|
|
|
str = skip_spaces(buffer);
|
|
rc = user_len;
|
|
if (strncmp(str, "reset", 5) == 0) {
|
|
dasd_profile_reset(prof);
|
|
} else if (strncmp(str, "on", 2) == 0) {
|
|
rc = dasd_profile_on(prof);
|
|
if (!rc)
|
|
rc = user_len;
|
|
} else if (strncmp(str, "off", 3) == 0) {
|
|
dasd_profile_off(prof);
|
|
} else
|
|
rc = -EINVAL;
|
|
vfree(buffer);
|
|
return rc;
|
|
}
|
|
|
|
static void dasd_stats_array(struct seq_file *m, unsigned int *array)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 32; i++)
|
|
seq_printf(m, "%u ", array[i]);
|
|
seq_putc(m, '\n');
|
|
}
|
|
|
|
static void dasd_stats_seq_print(struct seq_file *m,
|
|
struct dasd_profile_info *data)
|
|
{
|
|
seq_printf(m, "start_time %ld.%09ld\n",
|
|
data->starttod.tv_sec, data->starttod.tv_nsec);
|
|
seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
|
|
seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
|
|
seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
|
|
seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
|
|
seq_printf(m, "histogram_sectors ");
|
|
dasd_stats_array(m, data->dasd_io_secs);
|
|
seq_printf(m, "histogram_io_times ");
|
|
dasd_stats_array(m, data->dasd_io_times);
|
|
seq_printf(m, "histogram_io_times_weighted ");
|
|
dasd_stats_array(m, data->dasd_io_timps);
|
|
seq_printf(m, "histogram_time_build_to_ssch ");
|
|
dasd_stats_array(m, data->dasd_io_time1);
|
|
seq_printf(m, "histogram_time_ssch_to_irq ");
|
|
dasd_stats_array(m, data->dasd_io_time2);
|
|
seq_printf(m, "histogram_time_ssch_to_irq_weighted ");
|
|
dasd_stats_array(m, data->dasd_io_time2ps);
|
|
seq_printf(m, "histogram_time_irq_to_end ");
|
|
dasd_stats_array(m, data->dasd_io_time3);
|
|
seq_printf(m, "histogram_ccw_queue_length ");
|
|
dasd_stats_array(m, data->dasd_io_nr_req);
|
|
seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
|
|
seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
|
|
seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
|
|
seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
|
|
seq_printf(m, "histogram_read_sectors ");
|
|
dasd_stats_array(m, data->dasd_read_secs);
|
|
seq_printf(m, "histogram_read_times ");
|
|
dasd_stats_array(m, data->dasd_read_times);
|
|
seq_printf(m, "histogram_read_time_build_to_ssch ");
|
|
dasd_stats_array(m, data->dasd_read_time1);
|
|
seq_printf(m, "histogram_read_time_ssch_to_irq ");
|
|
dasd_stats_array(m, data->dasd_read_time2);
|
|
seq_printf(m, "histogram_read_time_irq_to_end ");
|
|
dasd_stats_array(m, data->dasd_read_time3);
|
|
seq_printf(m, "histogram_read_ccw_queue_length ");
|
|
dasd_stats_array(m, data->dasd_read_nr_req);
|
|
}
|
|
|
|
static int dasd_stats_show(struct seq_file *m, void *v)
|
|
{
|
|
struct dasd_profile *profile;
|
|
struct dasd_profile_info *data;
|
|
|
|
profile = m->private;
|
|
spin_lock_bh(&profile->lock);
|
|
data = profile->data;
|
|
if (!data) {
|
|
spin_unlock_bh(&profile->lock);
|
|
seq_printf(m, "disabled\n");
|
|
return 0;
|
|
}
|
|
dasd_stats_seq_print(m, data);
|
|
spin_unlock_bh(&profile->lock);
|
|
return 0;
|
|
}
|
|
|
|
static int dasd_stats_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct dasd_profile *profile = inode->i_private;
|
|
return single_open(file, dasd_stats_show, profile);
|
|
}
|
|
|
|
static const struct file_operations dasd_stats_raw_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = dasd_stats_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
.write = dasd_stats_write,
|
|
};
|
|
|
|
static ssize_t dasd_stats_global_write(struct file *file,
|
|
const char __user *user_buf,
|
|
size_t user_len, loff_t *pos)
|
|
{
|
|
char *buffer, *str;
|
|
ssize_t rc;
|
|
|
|
if (user_len > 65536)
|
|
user_len = 65536;
|
|
buffer = dasd_get_user_string(user_buf, user_len);
|
|
if (IS_ERR(buffer))
|
|
return PTR_ERR(buffer);
|
|
str = skip_spaces(buffer);
|
|
rc = user_len;
|
|
if (strncmp(str, "reset", 5) == 0) {
|
|
dasd_global_profile_reset();
|
|
} else if (strncmp(str, "on", 2) == 0) {
|
|
dasd_global_profile_reset();
|
|
dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
|
|
} else if (strncmp(str, "off", 3) == 0) {
|
|
dasd_global_profile_level = DASD_PROFILE_OFF;
|
|
} else
|
|
rc = -EINVAL;
|
|
vfree(buffer);
|
|
return rc;
|
|
}
|
|
|
|
static int dasd_stats_global_show(struct seq_file *m, void *v)
|
|
{
|
|
if (!dasd_global_profile_level) {
|
|
seq_printf(m, "disabled\n");
|
|
return 0;
|
|
}
|
|
dasd_stats_seq_print(m, &dasd_global_profile_data);
|
|
return 0;
|
|
}
|
|
|
|
static int dasd_stats_global_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, dasd_stats_global_show, NULL);
|
|
}
|
|
|
|
static const struct file_operations dasd_stats_global_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = dasd_stats_global_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
.write = dasd_stats_global_write,
|
|
};
|
|
|
|
static void dasd_profile_init(struct dasd_profile *profile,
|
|
struct dentry *base_dentry)
|
|
{
|
|
mode_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);
|
|
if (profile->dentry) {
|
|
debugfs_remove(profile->dentry);
|
|
profile->dentry = NULL;
|
|
}
|
|
}
|
|
|
|
static void dasd_statistics_removeroot(void)
|
|
{
|
|
dasd_global_profile_level = DASD_PROFILE_OFF;
|
|
if (dasd_global_profile_dentry) {
|
|
debugfs_remove(dasd_global_profile_dentry);
|
|
dasd_global_profile_dentry = NULL;
|
|
}
|
|
if (dasd_debugfs_global_entry)
|
|
debugfs_remove(dasd_debugfs_global_entry);
|
|
if (dasd_debugfs_root_entry)
|
|
debugfs_remove(dasd_debugfs_root_entry);
|
|
}
|
|
|
|
static void dasd_statistics_createroot(void)
|
|
{
|
|
mode_t mode;
|
|
struct dentry *pde;
|
|
|
|
dasd_debugfs_root_entry = NULL;
|
|
dasd_debugfs_global_entry = NULL;
|
|
dasd_global_profile_dentry = NULL;
|
|
pde = debugfs_create_dir("dasd", NULL);
|
|
if (!pde || IS_ERR(pde))
|
|
goto error;
|
|
dasd_debugfs_root_entry = pde;
|
|
pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
|
|
if (!pde || IS_ERR(pde))
|
|
goto error;
|
|
dasd_debugfs_global_entry = pde;
|
|
|
|
mode = (S_IRUSR | S_IWUSR | S_IFREG);
|
|
pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry,
|
|
NULL, &dasd_stats_global_fops);
|
|
if (!pde || IS_ERR(pde))
|
|
goto error;
|
|
dasd_global_profile_dentry = pde;
|
|
return;
|
|
|
|
error:
|
|
DBF_EVENT(DBF_ERR, "%s",
|
|
"Creation of the dasd debugfs interface failed");
|
|
dasd_statistics_removeroot();
|
|
return;
|
|
}
|
|
|
|
#else
|
|
#define dasd_profile_start(block, cqr, req) do {} while (0)
|
|
#define dasd_profile_end(block, cqr, req) do {} while (0)
|
|
|
|
static void dasd_statistics_createroot(void)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static void dasd_statistics_removeroot(void)
|
|
{
|
|
return;
|
|
}
|
|
|
|
int dasd_stats_generic_show(struct seq_file *m, void *v)
|
|
{
|
|
seq_printf(m, "Statistics are not activated in this kernel\n");
|
|
return 0;
|
|
}
|
|
|
|
static void dasd_profile_init(struct dasd_profile *profile,
|
|
struct dentry *base_dentry)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static void dasd_profile_exit(struct dasd_profile *profile)
|
|
{
|
|
return;
|
|
}
|
|
|
|
int dasd_profile_on(struct dasd_profile *profile)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_DASD_PROFILE */
|
|
|
|
/*
|
|
* Allocate memory for a channel program with 'cplength' channel
|
|
* command words and 'datasize' additional space. There are two
|
|
* variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
|
|
* memory and 2) dasd_smalloc_request uses the static ccw memory
|
|
* that gets allocated for each device.
|
|
*/
|
|
struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
|
|
int datasize,
|
|
struct dasd_device *device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
/* Sanity checks */
|
|
BUG_ON(datasize > PAGE_SIZE ||
|
|
(cplength*sizeof(struct ccw1)) > PAGE_SIZE);
|
|
|
|
cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
|
|
if (cqr == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
cqr->cpaddr = NULL;
|
|
if (cplength > 0) {
|
|
cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
|
|
GFP_ATOMIC | GFP_DMA);
|
|
if (cqr->cpaddr == NULL) {
|
|
kfree(cqr);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
}
|
|
cqr->data = NULL;
|
|
if (datasize > 0) {
|
|
cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
|
|
if (cqr->data == NULL) {
|
|
kfree(cqr->cpaddr);
|
|
kfree(cqr);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
}
|
|
cqr->magic = magic;
|
|
set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
|
|
dasd_get_device(device);
|
|
return cqr;
|
|
}
|
|
|
|
struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
|
|
int datasize,
|
|
struct dasd_device *device)
|
|
{
|
|
unsigned long flags;
|
|
struct dasd_ccw_req *cqr;
|
|
char *data;
|
|
int size;
|
|
|
|
size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
|
|
if (cplength > 0)
|
|
size += cplength * sizeof(struct ccw1);
|
|
if (datasize > 0)
|
|
size += datasize;
|
|
spin_lock_irqsave(&device->mem_lock, flags);
|
|
cqr = (struct dasd_ccw_req *)
|
|
dasd_alloc_chunk(&device->ccw_chunks, size);
|
|
spin_unlock_irqrestore(&device->mem_lock, flags);
|
|
if (cqr == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
memset(cqr, 0, sizeof(struct dasd_ccw_req));
|
|
data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
|
|
cqr->cpaddr = NULL;
|
|
if (cplength > 0) {
|
|
cqr->cpaddr = (struct ccw1 *) data;
|
|
data += cplength*sizeof(struct ccw1);
|
|
memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
|
|
}
|
|
cqr->data = NULL;
|
|
if (datasize > 0) {
|
|
cqr->data = data;
|
|
memset(cqr->data, 0, datasize);
|
|
}
|
|
cqr->magic = magic;
|
|
set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
|
|
dasd_get_device(device);
|
|
return cqr;
|
|
}
|
|
|
|
/*
|
|
* Free memory of a channel program. This function needs to free all the
|
|
* idal lists that might have been created by dasd_set_cda and the
|
|
* struct dasd_ccw_req itself.
|
|
*/
|
|
void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
|
|
{
|
|
#ifdef CONFIG_64BIT
|
|
struct ccw1 *ccw;
|
|
|
|
/* Clear any idals used for the request. */
|
|
ccw = cqr->cpaddr;
|
|
do {
|
|
clear_normalized_cda(ccw);
|
|
} while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
|
|
#endif
|
|
kfree(cqr->cpaddr);
|
|
kfree(cqr->data);
|
|
kfree(cqr);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&device->mem_lock, flags);
|
|
dasd_free_chunk(&device->ccw_chunks, cqr);
|
|
spin_unlock_irqrestore(&device->mem_lock, flags);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
/*
|
|
* Check discipline magic in cqr.
|
|
*/
|
|
static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
|
|
if (cqr == NULL)
|
|
return -EINVAL;
|
|
device = cqr->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_clock();
|
|
cqr->starttime = 0;
|
|
DBF_DEV_EVENT(DBF_DEBUG, device,
|
|
"terminate cqr %p successful",
|
|
cqr);
|
|
break;
|
|
case -ENODEV:
|
|
DBF_DEV_EVENT(DBF_ERR, device, "%s",
|
|
"device gone, retry");
|
|
break;
|
|
case -EIO:
|
|
DBF_DEV_EVENT(DBF_ERR, device, "%s",
|
|
"I/O error, retry");
|
|
break;
|
|
case -EINVAL:
|
|
case -EBUSY:
|
|
DBF_DEV_EVENT(DBF_ERR, device, "%s",
|
|
"device busy, retry later");
|
|
break;
|
|
default:
|
|
/* internal error 10 - unknown rc*/
|
|
snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
|
|
dev_err(&device->cdev->dev, "An error occurred in the "
|
|
"DASD device driver, reason=%s\n", errorstring);
|
|
BUG();
|
|
break;
|
|
}
|
|
retries++;
|
|
}
|
|
dasd_schedule_device_bh(device);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* 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_clock();
|
|
cqr->starttime = jiffies;
|
|
cqr->retries--;
|
|
if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
|
|
cqr->lpm &= device->path_data.opm;
|
|
if (!cqr->lpm)
|
|
cqr->lpm = device->path_data.opm;
|
|
}
|
|
if (cqr->cpmode == 1) {
|
|
rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
|
|
(long) cqr, cqr->lpm);
|
|
} else {
|
|
rc = ccw_device_start(device->cdev, cqr->cpaddr,
|
|
(long) cqr, cqr->lpm, 0);
|
|
}
|
|
switch (rc) {
|
|
case 0:
|
|
cqr->status = DASD_CQR_IN_IO;
|
|
break;
|
|
case -EBUSY:
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
"start_IO: device busy, retry later");
|
|
break;
|
|
case -ETIMEDOUT:
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
"start_IO: request timeout, retry later");
|
|
break;
|
|
case -EACCES:
|
|
/* -EACCES indicates that the request used only a subset of the
|
|
* available paths and all these paths are gone. If the lpm of
|
|
* this request was only a subset of the opm (e.g. the ppm) then
|
|
* we just do a retry with all available paths.
|
|
* If we already use the full opm, something is amiss, and we
|
|
* need a full path verification.
|
|
*/
|
|
if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
|
|
DBF_DEV_EVENT(DBF_WARNING, device,
|
|
"start_IO: selected paths gone (%x)",
|
|
cqr->lpm);
|
|
} else if (cqr->lpm != device->path_data.opm) {
|
|
cqr->lpm = device->path_data.opm;
|
|
DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
|
|
"start_IO: selected paths gone,"
|
|
" retry on all paths");
|
|
} else {
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
"start_IO: all paths in opm gone,"
|
|
" do path verification");
|
|
dasd_generic_last_path_gone(device);
|
|
device->path_data.opm = 0;
|
|
device->path_data.ppm = 0;
|
|
device->path_data.npm = 0;
|
|
device->path_data.tbvpm =
|
|
ccw_device_get_path_mask(device->cdev);
|
|
}
|
|
break;
|
|
case -ENODEV:
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
"start_IO: -ENODEV device gone, retry");
|
|
break;
|
|
case -EIO:
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
"start_IO: -EIO device gone, retry");
|
|
break;
|
|
case -EINVAL:
|
|
/* most likely caused in power management context */
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
"start_IO: -EINVAL device currently "
|
|
"not accessible");
|
|
break;
|
|
default:
|
|
/* internal error 11 - unknown rc */
|
|
snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
|
|
dev_err(&device->cdev->dev,
|
|
"An error occurred in the DASD device driver, "
|
|
"reason=%s\n", errorstring);
|
|
BUG();
|
|
break;
|
|
}
|
|
cqr->intrc = rc;
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Timeout function for dasd devices. This is used for different purposes
|
|
* 1) missing interrupt handler for normal operation
|
|
* 2) delayed start of request where start_IO failed with -EBUSY
|
|
* 3) timeout for missing state change interrupts
|
|
* The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
|
|
* DASD_CQR_QUEUED for 2) and 3).
|
|
*/
|
|
static void dasd_device_timeout(unsigned long ptr)
|
|
{
|
|
unsigned long flags;
|
|
struct dasd_device *device;
|
|
|
|
device = (struct dasd_device *) ptr;
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
|
/* re-activate request queue */
|
|
dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
dasd_schedule_device_bh(device);
|
|
}
|
|
|
|
/*
|
|
* Setup timeout for a device in jiffies.
|
|
*/
|
|
void dasd_device_set_timer(struct dasd_device *device, int expires)
|
|
{
|
|
if (expires == 0)
|
|
del_timer(&device->timer);
|
|
else
|
|
mod_timer(&device->timer, jiffies + expires);
|
|
}
|
|
|
|
/*
|
|
* Clear timeout for a device.
|
|
*/
|
|
void dasd_device_clear_timer(struct dasd_device *device)
|
|
{
|
|
del_timer(&device->timer);
|
|
}
|
|
|
|
static void dasd_handle_killed_request(struct ccw_device *cdev,
|
|
unsigned long intparm)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
struct dasd_device *device;
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Interrupt handler for "normal" ssch-io based dasd devices.
|
|
*/
|
|
void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
|
|
struct irb *irb)
|
|
{
|
|
struct dasd_ccw_req *cqr, *next;
|
|
struct dasd_device *device;
|
|
unsigned long long now;
|
|
int expires;
|
|
|
|
if (IS_ERR(irb)) {
|
|
switch (PTR_ERR(irb)) {
|
|
case -EIO:
|
|
break;
|
|
case -ETIMEDOUT:
|
|
DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
|
|
"request timed out\n", __func__);
|
|
break;
|
|
default:
|
|
DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
|
|
"unknown error %ld\n", __func__,
|
|
PTR_ERR(irb));
|
|
}
|
|
dasd_handle_killed_request(cdev, intparm);
|
|
return;
|
|
}
|
|
|
|
now = get_clock();
|
|
cqr = (struct dasd_ccw_req *) intparm;
|
|
/* check for conditions that should be handled immediately */
|
|
if (!cqr ||
|
|
!(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
|
|
scsw_cstat(&irb->scsw) == 0)) {
|
|
if (cqr)
|
|
memcpy(&cqr->irb, irb, sizeof(*irb));
|
|
device = dasd_device_from_cdev_locked(cdev);
|
|
if (IS_ERR(device))
|
|
return;
|
|
/* ignore unsolicited interrupts for DIAG discipline */
|
|
if (device->discipline == dasd_diag_discipline_pointer) {
|
|
dasd_put_device(device);
|
|
return;
|
|
}
|
|
device->discipline->dump_sense_dbf(device, irb, "int");
|
|
if (device->features & DASD_FEATURE_ERPLOG)
|
|
device->discipline->dump_sense(device, cqr, irb);
|
|
device->discipline->check_for_device_change(device, cqr, irb);
|
|
dasd_put_device(device);
|
|
}
|
|
if (!cqr)
|
|
return;
|
|
|
|
device = (struct dasd_device *) cqr->startdev;
|
|
if (!device ||
|
|
strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
|
|
DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
|
|
"invalid device in request");
|
|
return;
|
|
}
|
|
|
|
/* Check for clear pending */
|
|
if (cqr->status == DASD_CQR_CLEAR_PENDING &&
|
|
scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
|
|
cqr->status = DASD_CQR_CLEARED;
|
|
dasd_device_clear_timer(device);
|
|
wake_up(&dasd_flush_wq);
|
|
dasd_schedule_device_bh(device);
|
|
return;
|
|
}
|
|
|
|
/* check status - the request might have been killed by dyn detach */
|
|
if (cqr->status != DASD_CQR_IN_IO) {
|
|
DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
|
|
"status %02x", dev_name(&cdev->dev), cqr->status);
|
|
return;
|
|
}
|
|
|
|
next = NULL;
|
|
expires = 0;
|
|
if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
|
|
scsw_cstat(&irb->scsw) == 0) {
|
|
/* request was completed successfully */
|
|
cqr->status = DASD_CQR_SUCCESS;
|
|
cqr->stopclk = now;
|
|
/* Start first request on queue if possible -> fast_io. */
|
|
if (cqr->devlist.next != &device->ccw_queue) {
|
|
next = list_entry(cqr->devlist.next,
|
|
struct dasd_ccw_req, devlist);
|
|
}
|
|
} else { /* error */
|
|
/*
|
|
* If we don't want complex ERP for this request, then just
|
|
* reset this and retry it in the fastpath
|
|
*/
|
|
if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
|
|
cqr->retries > 0) {
|
|
if (cqr->lpm == device->path_data.opm)
|
|
DBF_DEV_EVENT(DBF_DEBUG, device,
|
|
"default ERP in fastpath "
|
|
"(%i retries left)",
|
|
cqr->retries);
|
|
if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
|
|
cqr->lpm = device->path_data.opm;
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
next = cqr;
|
|
} else
|
|
cqr->status = DASD_CQR_ERROR;
|
|
}
|
|
if (next && (next->status == DASD_CQR_QUEUED) &&
|
|
(!device->stopped)) {
|
|
if (device->discipline->start_IO(next) == 0)
|
|
expires = next->expires;
|
|
}
|
|
if (expires != 0)
|
|
dasd_device_set_timer(device, expires);
|
|
else
|
|
dasd_device_clear_timer(device);
|
|
dasd_schedule_device_bh(device);
|
|
}
|
|
|
|
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);
|
|
|
|
/* Stop list processing at the first non-final request. */
|
|
if (cqr->status == DASD_CQR_QUEUED ||
|
|
cqr->status == DASD_CQR_IN_IO ||
|
|
cqr->status == DASD_CQR_CLEAR_PENDING)
|
|
break;
|
|
if (cqr->status == DASD_CQR_ERROR) {
|
|
__dasd_device_recovery(device, cqr);
|
|
}
|
|
/* Rechain finished requests to final queue */
|
|
list_move_tail(&cqr->devlist, final_queue);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* the cqrs from the final queue are returned to the upper layer
|
|
* by setting a dasd_block state and calling the callback function
|
|
*/
|
|
static void __dasd_device_process_final_queue(struct dasd_device *device,
|
|
struct list_head *final_queue)
|
|
{
|
|
struct list_head *l, *n;
|
|
struct dasd_ccw_req *cqr;
|
|
struct dasd_block *block;
|
|
void (*callback)(struct dasd_ccw_req *, void *data);
|
|
void *callback_data;
|
|
char errorstring[ERRORLENGTH];
|
|
|
|
list_for_each_safe(l, n, final_queue) {
|
|
cqr = list_entry(l, struct dasd_ccw_req, devlist);
|
|
list_del_init(&cqr->devlist);
|
|
block = cqr->block;
|
|
callback = cqr->callback;
|
|
callback_data = cqr->callback_data;
|
|
if (block)
|
|
spin_lock_bh(&block->queue_lock);
|
|
switch (cqr->status) {
|
|
case DASD_CQR_SUCCESS:
|
|
cqr->status = DASD_CQR_DONE;
|
|
break;
|
|
case DASD_CQR_ERROR:
|
|
cqr->status = DASD_CQR_NEED_ERP;
|
|
break;
|
|
case DASD_CQR_CLEARED:
|
|
cqr->status = DASD_CQR_TERMINATED;
|
|
break;
|
|
default:
|
|
/* internal error 12 - wrong cqr status*/
|
|
snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
|
|
dev_err(&device->cdev->dev,
|
|
"An error occurred in the DASD device driver, "
|
|
"reason=%s\n", errorstring);
|
|
BUG();
|
|
}
|
|
if (cqr->callback != NULL)
|
|
(callback)(cqr, callback_data);
|
|
if (block)
|
|
spin_unlock_bh(&block->queue_lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Take a look at the first request on the ccw queue and check
|
|
* if it reached its expire time. If so, terminate the IO.
|
|
*/
|
|
static void __dasd_device_check_expire(struct dasd_device *device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
if (list_empty(&device->ccw_queue))
|
|
return;
|
|
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
|
|
if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
|
|
(time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
|
|
if (device->discipline->term_IO(cqr) != 0) {
|
|
/* Hmpf, try again in 5 sec */
|
|
dev_err(&device->cdev->dev,
|
|
"cqr %p timed out (%lus) but cannot be "
|
|
"ended, retrying in 5 s\n",
|
|
cqr, (cqr->expires/HZ));
|
|
cqr->expires += 5*HZ;
|
|
dasd_device_set_timer(device, 5*HZ);
|
|
} else {
|
|
dev_err(&device->cdev->dev,
|
|
"cqr %p timed out (%lus), %i retries "
|
|
"remaining\n", cqr, (cqr->expires/HZ),
|
|
cqr->retries);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Take a look at the first request on the ccw queue and check
|
|
* if it needs to be started.
|
|
*/
|
|
static void __dasd_device_start_head(struct dasd_device *device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
int rc;
|
|
|
|
if (list_empty(&device->ccw_queue))
|
|
return;
|
|
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
|
|
if (cqr->status != DASD_CQR_QUEUED)
|
|
return;
|
|
/* when device is stopped, return request to previous layer
|
|
* exception: only the disconnect or unresumed bits are set and the
|
|
* cqr is a path verification request
|
|
*/
|
|
if (device->stopped &&
|
|
!(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
|
|
&& test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
|
|
cqr->intrc = -EAGAIN;
|
|
cqr->status = DASD_CQR_CLEARED;
|
|
dasd_schedule_device_bh(device);
|
|
return;
|
|
}
|
|
|
|
rc = device->discipline->start_IO(cqr);
|
|
if (rc == 0)
|
|
dasd_device_set_timer(device, cqr->expires);
|
|
else if (rc == -EACCES) {
|
|
dasd_schedule_device_bh(device);
|
|
} else
|
|
/* Hmpf, try again in 1/2 sec */
|
|
dasd_device_set_timer(device, 50);
|
|
}
|
|
|
|
static void __dasd_device_check_path_events(struct dasd_device *device)
|
|
{
|
|
int rc;
|
|
|
|
if (device->path_data.tbvpm) {
|
|
if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
|
|
DASD_UNRESUMED_PM))
|
|
return;
|
|
rc = device->discipline->verify_path(
|
|
device, device->path_data.tbvpm);
|
|
if (rc)
|
|
dasd_device_set_timer(device, 50);
|
|
else
|
|
device->path_data.tbvpm = 0;
|
|
}
|
|
};
|
|
|
|
/*
|
|
* Go through all request on the dasd_device request queue,
|
|
* terminate them on the cdev if necessary, and return them to the
|
|
* submitting layer via callback.
|
|
* Note:
|
|
* Make sure that all 'submitting layers' still exist when
|
|
* this function is called!. In other words, when 'device' is a base
|
|
* device then all block layer requests must have been removed before
|
|
* via dasd_flush_block_queue.
|
|
*/
|
|
int dasd_flush_device_queue(struct dasd_device *device)
|
|
{
|
|
struct dasd_ccw_req *cqr, *n;
|
|
int rc;
|
|
struct list_head flush_queue;
|
|
|
|
INIT_LIST_HEAD(&flush_queue);
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
rc = 0;
|
|
list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
|
|
/* Check status and move request to flush_queue */
|
|
switch (cqr->status) {
|
|
case DASD_CQR_IN_IO:
|
|
rc = device->discipline->term_IO(cqr);
|
|
if (rc) {
|
|
/* unable to terminate requeust */
|
|
dev_err(&device->cdev->dev,
|
|
"Flushing the DASD request queue "
|
|
"failed for request %p\n", cqr);
|
|
/* stop flush processing */
|
|
goto finished;
|
|
}
|
|
break;
|
|
case DASD_CQR_QUEUED:
|
|
cqr->stopclk = get_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;
|
|
}
|
|
|
|
/*
|
|
* Acquire the device lock and process queues for the device.
|
|
*/
|
|
static void dasd_device_tasklet(struct dasd_device *device)
|
|
{
|
|
struct list_head final_queue;
|
|
|
|
atomic_set (&device->tasklet_scheduled, 0);
|
|
INIT_LIST_HEAD(&final_queue);
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
/* Check expire time of first request on the ccw queue. */
|
|
__dasd_device_check_expire(device);
|
|
/* find final requests on ccw queue */
|
|
__dasd_device_process_ccw_queue(device, &final_queue);
|
|
__dasd_device_check_path_events(device);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
/* Now call the callback function of requests with final status */
|
|
__dasd_device_process_final_queue(device, &final_queue);
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
/* Now check if the head of the ccw queue needs to be started. */
|
|
__dasd_device_start_head(device);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* Wakeup helper for the 'sleep_on' functions.
|
|
*/
|
|
static 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);
|
|
}
|
|
|
|
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;
|
|
continue;
|
|
}
|
|
/* Don't try to start requests if device is stopped */
|
|
if (interruptible) {
|
|
rc = wait_event_interruptible(
|
|
generic_waitq, !(device->stopped));
|
|
if (rc == -ERESTARTSYS) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
maincqr->intrc = rc;
|
|
continue;
|
|
}
|
|
} else
|
|
wait_event(generic_waitq, !(device->stopped));
|
|
|
|
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_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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Cancels a request that was started with dasd_sleep_on_req.
|
|
* This is useful to timeout requests. The request will be
|
|
* terminated if it is currently in i/o.
|
|
* Returns 1 if the request has been terminated.
|
|
* 0 if there was no need to terminate the request (not started yet)
|
|
* negative error code if termination failed
|
|
* Cancellation of a request is an asynchronous operation! The calling
|
|
* function has to wait until the request is properly returned via callback.
|
|
*/
|
|
int dasd_cancel_req(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device = cqr->startdev;
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
rc = 0;
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
|
switch (cqr->status) {
|
|
case DASD_CQR_QUEUED:
|
|
/* request was not started - just set to cleared */
|
|
cqr->status = DASD_CQR_CLEARED;
|
|
break;
|
|
case DASD_CQR_IN_IO:
|
|
/* request in IO - terminate IO and release again */
|
|
rc = device->discipline->term_IO(cqr);
|
|
if (rc) {
|
|
dev_err(&device->cdev->dev,
|
|
"Cancelling request %p failed with rc=%d\n",
|
|
cqr, rc);
|
|
} else {
|
|
cqr->stopclk = get_clock();
|
|
}
|
|
break;
|
|
default: /* already finished or clear pending - do nothing */
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
dasd_schedule_device_bh(device);
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* SECTION: Operations of the dasd_block layer.
|
|
*/
|
|
|
|
/*
|
|
* Timeout function for dasd_block. This is used when the block layer
|
|
* is waiting for something that may not come reliably, (e.g. a state
|
|
* change interrupt)
|
|
*/
|
|
static void dasd_block_timeout(unsigned long ptr)
|
|
{
|
|
unsigned long flags;
|
|
struct dasd_block *block;
|
|
|
|
block = (struct dasd_block *) ptr;
|
|
spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
|
|
/* re-activate request queue */
|
|
dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
|
|
dasd_schedule_block_bh(block);
|
|
}
|
|
|
|
/*
|
|
* Setup timeout for a dasd_block in jiffies.
|
|
*/
|
|
void dasd_block_set_timer(struct dasd_block *block, int expires)
|
|
{
|
|
if (expires == 0)
|
|
del_timer(&block->timer);
|
|
else
|
|
mod_timer(&block->timer, jiffies + expires);
|
|
}
|
|
|
|
/*
|
|
* Clear timeout for a dasd_block.
|
|
*/
|
|
void dasd_block_clear_timer(struct dasd_block *block)
|
|
{
|
|
del_timer(&block->timer);
|
|
}
|
|
|
|
/*
|
|
* Process finished error recovery ccw.
|
|
*/
|
|
static void __dasd_process_erp(struct dasd_device *device,
|
|
struct dasd_ccw_req *cqr)
|
|
{
|
|
dasd_erp_fn_t erp_fn;
|
|
|
|
if (cqr->status == DASD_CQR_DONE)
|
|
DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
|
|
else
|
|
dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
|
|
erp_fn = device->discipline->erp_postaction(cqr);
|
|
erp_fn(cqr);
|
|
}
|
|
|
|
/*
|
|
* Fetch requests from the block device queue.
|
|
*/
|
|
static void __dasd_process_request_queue(struct dasd_block *block)
|
|
{
|
|
struct request_queue *queue;
|
|
struct request *req;
|
|
struct dasd_ccw_req *cqr;
|
|
struct dasd_device *basedev;
|
|
unsigned long flags;
|
|
queue = block->request_queue;
|
|
basedev = block->base;
|
|
/* No queue ? Then there is nothing to do. */
|
|
if (queue == NULL)
|
|
return;
|
|
|
|
/*
|
|
* We requeue request from the block device queue to the ccw
|
|
* queue only in two states. In state DASD_STATE_READY the
|
|
* partition detection is done and we need to requeue requests
|
|
* for that. State DASD_STATE_ONLINE is normal block device
|
|
* operation.
|
|
*/
|
|
if (basedev->state < DASD_STATE_READY) {
|
|
while ((req = blk_fetch_request(block->request_queue)))
|
|
__blk_end_request_all(req, -EIO);
|
|
return;
|
|
}
|
|
/* Now we try to fetch requests from the request queue */
|
|
while ((req = blk_peek_request(queue))) {
|
|
if (basedev->features & DASD_FEATURE_READONLY &&
|
|
rq_data_dir(req) == WRITE) {
|
|
DBF_DEV_EVENT(DBF_ERR, basedev,
|
|
"Rejecting write request %p",
|
|
req);
|
|
blk_start_request(req);
|
|
__blk_end_request_all(req, -EIO);
|
|
continue;
|
|
}
|
|
cqr = basedev->discipline->build_cp(basedev, block, req);
|
|
if (IS_ERR(cqr)) {
|
|
if (PTR_ERR(cqr) == -EBUSY)
|
|
break; /* normal end condition */
|
|
if (PTR_ERR(cqr) == -ENOMEM)
|
|
break; /* terminate request queue loop */
|
|
if (PTR_ERR(cqr) == -EAGAIN) {
|
|
/*
|
|
* The current request cannot be build right
|
|
* now, we have to try later. If this request
|
|
* is the head-of-queue we stop the device
|
|
* for 1/2 second.
|
|
*/
|
|
if (!list_empty(&block->ccw_queue))
|
|
break;
|
|
spin_lock_irqsave(
|
|
get_ccwdev_lock(basedev->cdev), flags);
|
|
dasd_device_set_stop_bits(basedev,
|
|
DASD_STOPPED_PENDING);
|
|
spin_unlock_irqrestore(
|
|
get_ccwdev_lock(basedev->cdev), flags);
|
|
dasd_block_set_timer(block, HZ/2);
|
|
break;
|
|
}
|
|
DBF_DEV_EVENT(DBF_ERR, basedev,
|
|
"CCW creation failed (rc=%ld) "
|
|
"on request %p",
|
|
PTR_ERR(cqr), req);
|
|
blk_start_request(req);
|
|
__blk_end_request_all(req, -EIO);
|
|
continue;
|
|
}
|
|
/*
|
|
* Note: callback is set to dasd_return_cqr_cb in
|
|
* __dasd_block_start_head to cover erp requests as well
|
|
*/
|
|
cqr->callback_data = (void *) req;
|
|
cqr->status = DASD_CQR_FILLED;
|
|
blk_start_request(req);
|
|
list_add_tail(&cqr->blocklist, &block->ccw_queue);
|
|
dasd_profile_start(block, cqr, req);
|
|
}
|
|
}
|
|
|
|
static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct request *req;
|
|
int status;
|
|
int error = 0;
|
|
|
|
req = (struct request *) cqr->callback_data;
|
|
dasd_profile_end(cqr->block, cqr, req);
|
|
status = cqr->block->base->discipline->free_cp(cqr, req);
|
|
if (status <= 0)
|
|
error = status ? status : -EIO;
|
|
__blk_end_request_all(req, error);
|
|
}
|
|
|
|
/*
|
|
* Process ccw request queue.
|
|
*/
|
|
static void __dasd_process_block_ccw_queue(struct dasd_block *block,
|
|
struct list_head *final_queue)
|
|
{
|
|
struct list_head *l, *n;
|
|
struct dasd_ccw_req *cqr;
|
|
dasd_erp_fn_t erp_fn;
|
|
unsigned long flags;
|
|
struct dasd_device *base = block->base;
|
|
|
|
restart:
|
|
/* Process request with final status. */
|
|
list_for_each_safe(l, n, &block->ccw_queue) {
|
|
cqr = list_entry(l, struct dasd_ccw_req, blocklist);
|
|
if (cqr->status != DASD_CQR_DONE &&
|
|
cqr->status != DASD_CQR_FAILED &&
|
|
cqr->status != DASD_CQR_NEED_ERP &&
|
|
cqr->status != DASD_CQR_TERMINATED)
|
|
continue;
|
|
|
|
if (cqr->status == DASD_CQR_TERMINATED) {
|
|
base->discipline->handle_terminated_request(cqr);
|
|
goto restart;
|
|
}
|
|
|
|
/* Process requests that may be recovered */
|
|
if (cqr->status == DASD_CQR_NEED_ERP) {
|
|
erp_fn = base->discipline->erp_action(cqr);
|
|
if (IS_ERR(erp_fn(cqr)))
|
|
continue;
|
|
goto restart;
|
|
}
|
|
|
|
/* log sense for fatal error */
|
|
if (cqr->status == DASD_CQR_FAILED) {
|
|
dasd_log_sense(cqr, &cqr->irb);
|
|
}
|
|
|
|
/* First of all call extended error reporting. */
|
|
if (dasd_eer_enabled(base) &&
|
|
cqr->status == DASD_CQR_FAILED) {
|
|
dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
|
|
|
|
/* restart request */
|
|
cqr->status = DASD_CQR_FILLED;
|
|
cqr->retries = 255;
|
|
spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
|
|
dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
|
|
flags);
|
|
goto restart;
|
|
}
|
|
|
|
/* Process finished ERP request. */
|
|
if (cqr->refers) {
|
|
__dasd_process_erp(base, cqr);
|
|
goto restart;
|
|
}
|
|
|
|
/* Rechain finished requests to final queue */
|
|
cqr->endclk = get_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;
|
|
dasd_schedule_block_bh(block);
|
|
continue;
|
|
}
|
|
/* Don't try to start requests if device is stopped */
|
|
if (block->base->stopped)
|
|
return;
|
|
|
|
/* just a fail safe check, should not happen */
|
|
if (!cqr->startdev)
|
|
cqr->startdev = block->base;
|
|
|
|
/* make sure that the requests we submit find their way back */
|
|
cqr->callback = dasd_return_cqr_cb;
|
|
|
|
dasd_add_request_tail(cqr);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Central dasd_block layer routine. Takes requests from the generic
|
|
* block layer request queue, creates ccw requests, enqueues them on
|
|
* a dasd_device and processes ccw requests that have been returned.
|
|
*/
|
|
static void dasd_block_tasklet(struct dasd_block *block)
|
|
{
|
|
struct list_head final_queue;
|
|
struct list_head *l, *n;
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
atomic_set(&block->tasklet_scheduled, 0);
|
|
INIT_LIST_HEAD(&final_queue);
|
|
spin_lock(&block->queue_lock);
|
|
/* Finish off requests on ccw queue */
|
|
__dasd_process_block_ccw_queue(block, &final_queue);
|
|
spin_unlock(&block->queue_lock);
|
|
/* Now call the callback function of requests with final status */
|
|
spin_lock_irq(&block->request_queue_lock);
|
|
list_for_each_safe(l, n, &final_queue) {
|
|
cqr = list_entry(l, struct dasd_ccw_req, blocklist);
|
|
list_del_init(&cqr->blocklist);
|
|
__dasd_cleanup_cqr(cqr);
|
|
}
|
|
spin_lock(&block->queue_lock);
|
|
/* Get new request from the block device request queue */
|
|
__dasd_process_request_queue(block);
|
|
/* Now check if the head of the ccw queue needs to be started. */
|
|
__dasd_block_start_head(block);
|
|
spin_unlock(&block->queue_lock);
|
|
spin_unlock_irq(&block->request_queue_lock);
|
|
dasd_put_device(block->base);
|
|
}
|
|
|
|
static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
|
|
{
|
|
wake_up(&dasd_flush_wq);
|
|
}
|
|
|
|
/*
|
|
* Go through all request on the dasd_block request queue, cancel them
|
|
* on the respective dasd_device, and return them to the generic
|
|
* block layer.
|
|
*/
|
|
static int dasd_flush_block_queue(struct dasd_block *block)
|
|
{
|
|
struct dasd_ccw_req *cqr, *n;
|
|
int rc, i;
|
|
struct list_head flush_queue;
|
|
|
|
INIT_LIST_HEAD(&flush_queue);
|
|
spin_lock_bh(&block->queue_lock);
|
|
rc = 0;
|
|
restart:
|
|
list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
|
|
/* if this request currently owned by a dasd_device cancel it */
|
|
if (cqr->status >= DASD_CQR_QUEUED)
|
|
rc = dasd_cancel_req(cqr);
|
|
if (rc < 0)
|
|
break;
|
|
/* Rechain request (including erp chain) so it won't be
|
|
* touched by the dasd_block_tasklet anymore.
|
|
* Replace the callback so we notice when the request
|
|
* is returned from the dasd_device layer.
|
|
*/
|
|
cqr->callback = _dasd_wake_block_flush_cb;
|
|
for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
|
|
list_move_tail(&cqr->blocklist, &flush_queue);
|
|
if (i > 1)
|
|
/* moved more than one request - need to restart */
|
|
goto restart;
|
|
}
|
|
spin_unlock_bh(&block->queue_lock);
|
|
/* Now call the callback function of flushed requests */
|
|
restart_cb:
|
|
list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
|
|
wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
|
|
/* Process finished ERP request. */
|
|
if (cqr->refers) {
|
|
spin_lock_bh(&block->queue_lock);
|
|
__dasd_process_erp(block->base, cqr);
|
|
spin_unlock_bh(&block->queue_lock);
|
|
/* restart list_for_xx loop since dasd_process_erp
|
|
* might remove multiple elements */
|
|
goto restart_cb;
|
|
}
|
|
/* call the callback function */
|
|
spin_lock_irq(&block->request_queue_lock);
|
|
cqr->endclk = get_clock();
|
|
list_del_init(&cqr->blocklist);
|
|
__dasd_cleanup_cqr(cqr);
|
|
spin_unlock_irq(&block->request_queue_lock);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Schedules a call to dasd_tasklet over the device tasklet.
|
|
*/
|
|
void dasd_schedule_block_bh(struct dasd_block *block)
|
|
{
|
|
/* Protect against rescheduling. */
|
|
if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
|
|
return;
|
|
/* life cycle of block is bound to it's base device */
|
|
dasd_get_device(block->base);
|
|
tasklet_hi_schedule(&block->tasklet);
|
|
}
|
|
|
|
|
|
/*
|
|
* SECTION: external block device operations
|
|
* (request queue handling, open, release, etc.)
|
|
*/
|
|
|
|
/*
|
|
* Dasd request queue function. Called from ll_rw_blk.c
|
|
*/
|
|
static void do_dasd_request(struct request_queue *queue)
|
|
{
|
|
struct dasd_block *block;
|
|
|
|
block = queue->queuedata;
|
|
spin_lock(&block->queue_lock);
|
|
/* Get new request from the block device request queue */
|
|
__dasd_process_request_queue(block);
|
|
/* Now check if the head of the ccw queue needs to be started. */
|
|
__dasd_block_start_head(block);
|
|
spin_unlock(&block->queue_lock);
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialize request queue and default I/O scheduler.
|
|
*/
|
|
static int dasd_alloc_queue(struct dasd_block *block)
|
|
{
|
|
int rc;
|
|
|
|
block->request_queue = blk_init_queue(do_dasd_request,
|
|
&block->request_queue_lock);
|
|
if (block->request_queue == NULL)
|
|
return -ENOMEM;
|
|
|
|
block->request_queue->queuedata = block;
|
|
|
|
elevator_exit(block->request_queue->elevator);
|
|
block->request_queue->elevator = NULL;
|
|
rc = elevator_init(block->request_queue, "deadline");
|
|
if (rc) {
|
|
blk_cleanup_queue(block->request_queue);
|
|
return rc;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialize request queue.
|
|
*/
|
|
static void dasd_setup_queue(struct dasd_block *block)
|
|
{
|
|
int max;
|
|
|
|
if (block->base->features & DASD_FEATURE_USERAW) {
|
|
/*
|
|
* the max_blocks value for raw_track access is 256
|
|
* it is higher than the native ECKD value because we
|
|
* only need one ccw per track
|
|
* so the max_hw_sectors are
|
|
* 2048 x 512B = 1024kB = 16 tracks
|
|
*/
|
|
max = 2048;
|
|
} else {
|
|
max = block->base->discipline->max_blocks << block->s2b_shift;
|
|
}
|
|
blk_queue_logical_block_size(block->request_queue,
|
|
block->bp_block);
|
|
blk_queue_max_hw_sectors(block->request_queue, max);
|
|
blk_queue_max_segments(block->request_queue, -1L);
|
|
/* with page sized segments we can translate each segement into
|
|
* one idaw/tidaw
|
|
*/
|
|
blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
|
|
blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
|
|
}
|
|
|
|
/*
|
|
* Deactivate and free request queue.
|
|
*/
|
|
static void dasd_free_queue(struct dasd_block *block)
|
|
{
|
|
if (block->request_queue) {
|
|
blk_cleanup_queue(block->request_queue);
|
|
block->request_queue = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Flush request on the request queue.
|
|
*/
|
|
static void dasd_flush_request_queue(struct dasd_block *block)
|
|
{
|
|
struct request *req;
|
|
|
|
if (!block->request_queue)
|
|
return;
|
|
|
|
spin_lock_irq(&block->request_queue_lock);
|
|
while ((req = blk_fetch_request(block->request_queue)))
|
|
__blk_end_request_all(req, -EIO);
|
|
spin_unlock_irq(&block->request_queue_lock);
|
|
}
|
|
|
|
static int dasd_open(struct block_device *bdev, fmode_t mode)
|
|
{
|
|
struct dasd_device *base;
|
|
int rc;
|
|
|
|
base = dasd_device_from_gendisk(bdev->bd_disk);
|
|
if (!base)
|
|
return -ENODEV;
|
|
|
|
atomic_inc(&base->block->open_count);
|
|
if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
|
|
rc = -ENODEV;
|
|
goto unlock;
|
|
}
|
|
|
|
if (!try_module_get(base->discipline->owner)) {
|
|
rc = -EINVAL;
|
|
goto unlock;
|
|
}
|
|
|
|
if (dasd_probeonly) {
|
|
dev_info(&base->cdev->dev,
|
|
"Accessing the DASD failed because it is in "
|
|
"probeonly mode\n");
|
|
rc = -EPERM;
|
|
goto out;
|
|
}
|
|
|
|
if (base->state <= DASD_STATE_BASIC) {
|
|
DBF_DEV_EVENT(DBF_ERR, base, " %s",
|
|
" Cannot open unrecognized device");
|
|
rc = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
if ((mode & FMODE_WRITE) &&
|
|
(test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
|
|
(base->features & DASD_FEATURE_READONLY))) {
|
|
rc = -EROFS;
|
|
goto out;
|
|
}
|
|
|
|
dasd_put_device(base);
|
|
return 0;
|
|
|
|
out:
|
|
module_put(base->discipline->owner);
|
|
unlock:
|
|
atomic_dec(&base->block->open_count);
|
|
dasd_put_device(base);
|
|
return rc;
|
|
}
|
|
|
|
static int dasd_release(struct gendisk *disk, fmode_t mode)
|
|
{
|
|
struct dasd_device *base;
|
|
|
|
base = dasd_device_from_gendisk(disk);
|
|
if (!base)
|
|
return -ENODEV;
|
|
|
|
atomic_dec(&base->block->open_count);
|
|
module_put(base->discipline->owner);
|
|
dasd_put_device(base);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return disk geometry.
|
|
*/
|
|
static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
|
|
{
|
|
struct dasd_device *base;
|
|
|
|
base = dasd_device_from_gendisk(bdev->bd_disk);
|
|
if (!base)
|
|
return -ENODEV;
|
|
|
|
if (!base->discipline ||
|
|
!base->discipline->fill_geometry) {
|
|
dasd_put_device(base);
|
|
return -EINVAL;
|
|
}
|
|
base->discipline->fill_geometry(base->block, geo);
|
|
geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
|
|
dasd_put_device(base);
|
|
return 0;
|
|
}
|
|
|
|
const struct block_device_operations
|
|
dasd_device_operations = {
|
|
.owner = THIS_MODULE,
|
|
.open = dasd_open,
|
|
.release = dasd_release,
|
|
.ioctl = dasd_ioctl,
|
|
.compat_ioctl = dasd_ioctl,
|
|
.getgeo = dasd_getgeo,
|
|
};
|
|
|
|
/*******************************************************************************
|
|
* end of block device operations
|
|
*/
|
|
|
|
static void
|
|
dasd_exit(void)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
dasd_proc_exit();
|
|
#endif
|
|
dasd_eer_exit();
|
|
if (dasd_page_cache != NULL) {
|
|
kmem_cache_destroy(dasd_page_cache);
|
|
dasd_page_cache = NULL;
|
|
}
|
|
dasd_gendisk_exit();
|
|
dasd_devmap_exit();
|
|
if (dasd_debug_area != NULL) {
|
|
debug_unregister(dasd_debug_area);
|
|
dasd_debug_area = NULL;
|
|
}
|
|
dasd_statistics_removeroot();
|
|
}
|
|
|
|
/*
|
|
* SECTION: common functions for ccw_driver use
|
|
*/
|
|
|
|
/*
|
|
* Is the device read-only?
|
|
* Note that this function does not report the setting of the
|
|
* readonly device attribute, but how it is configured in z/VM.
|
|
*/
|
|
int dasd_device_is_ro(struct dasd_device *device)
|
|
{
|
|
struct ccw_dev_id dev_id;
|
|
struct diag210 diag_data;
|
|
int rc;
|
|
|
|
if (!MACHINE_IS_VM)
|
|
return 0;
|
|
ccw_device_get_id(device->cdev, &dev_id);
|
|
memset(&diag_data, 0, sizeof(diag_data));
|
|
diag_data.vrdcdvno = dev_id.devno;
|
|
diag_data.vrdclen = sizeof(diag_data);
|
|
rc = diag210(&diag_data);
|
|
if (rc == 0 || rc == 2) {
|
|
return diag_data.vrdcvfla & 0x80;
|
|
} else {
|
|
DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
|
|
dev_id.devno, rc);
|
|
return 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_device_is_ro);
|
|
|
|
static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
|
|
{
|
|
struct ccw_device *cdev = data;
|
|
int ret;
|
|
|
|
ret = ccw_device_set_online(cdev);
|
|
if (ret)
|
|
pr_warning("%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;
|
|
}
|
|
|
|
/*
|
|
* This will one day be called from a global not_oper handler.
|
|
* It is also used by driver_unregister during module unload.
|
|
*/
|
|
void dasd_generic_remove(struct ccw_device *cdev)
|
|
{
|
|
struct dasd_device *device;
|
|
struct dasd_block *block;
|
|
|
|
cdev->handler = NULL;
|
|
|
|
dasd_remove_sysfs_files(cdev);
|
|
device = dasd_device_from_cdev(cdev);
|
|
if (IS_ERR(device))
|
|
return;
|
|
if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
|
|
/* Already doing offline processing */
|
|
dasd_put_device(device);
|
|
return;
|
|
}
|
|
/*
|
|
* This device is removed unconditionally. Set offline
|
|
* flag to prevent dasd_open from opening it while it is
|
|
* no quite down yet.
|
|
*/
|
|
dasd_set_target_state(device, DASD_STATE_NEW);
|
|
/* dasd_delete_device destroys the device reference. */
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Activate a device. This is called from dasd_{eckd,fba}_probe() when either
|
|
* the device is detected for the first time and is supposed to be used
|
|
* or the user has started activation through sysfs.
|
|
*/
|
|
int dasd_generic_set_online(struct ccw_device *cdev,
|
|
struct dasd_discipline *base_discipline)
|
|
{
|
|
struct dasd_discipline *discipline;
|
|
struct dasd_device *device;
|
|
int rc;
|
|
|
|
/* first online clears initial online feature flag */
|
|
dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
|
|
device = dasd_create_device(cdev);
|
|
if (IS_ERR(device))
|
|
return PTR_ERR(device);
|
|
|
|
discipline = base_discipline;
|
|
if (device->features & DASD_FEATURE_USEDIAG) {
|
|
if (!dasd_diag_discipline_pointer) {
|
|
pr_warning("%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_warning("%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_warning("%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;
|
|
}
|
|
|
|
int dasd_generic_set_offline(struct ccw_device *cdev)
|
|
{
|
|
struct dasd_device *device;
|
|
struct dasd_block *block;
|
|
int max_count, open_count;
|
|
|
|
device = dasd_device_from_cdev(cdev);
|
|
if (IS_ERR(device))
|
|
return PTR_ERR(device);
|
|
if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
|
|
/* Already doing offline processing */
|
|
dasd_put_device(device);
|
|
return 0;
|
|
}
|
|
/*
|
|
* We must make sure that this device is currently not in use.
|
|
* The open_count is increased for every opener, that includes
|
|
* the blkdev_get in dasd_scan_partitions. We are only interested
|
|
* in the other openers.
|
|
*/
|
|
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_warning("%s: The DASD cannot be set offline "
|
|
"with open count %i\n",
|
|
dev_name(&cdev->dev), open_count);
|
|
else
|
|
pr_warning("%s: The DASD cannot be set offline "
|
|
"while it is in use\n",
|
|
dev_name(&cdev->dev));
|
|
clear_bit(DASD_FLAG_OFFLINE, &device->flags);
|
|
dasd_put_device(device);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
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;
|
|
}
|
|
|
|
int dasd_generic_last_path_gone(struct dasd_device *device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
dev_warn(&device->cdev->dev, "No operational channel path is left "
|
|
"for the device\n");
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
|
|
/* First of all call extended error reporting. */
|
|
dasd_eer_write(device, NULL, DASD_EER_NOPATH);
|
|
|
|
if (device->state < DASD_STATE_BASIC)
|
|
return 0;
|
|
/* Device is active. We want to keep it. */
|
|
list_for_each_entry(cqr, &device->ccw_queue, devlist)
|
|
if ((cqr->status == DASD_CQR_IN_IO) ||
|
|
(cqr->status == DASD_CQR_CLEAR_PENDING)) {
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
cqr->retries++;
|
|
}
|
|
dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
|
|
dasd_device_clear_timer(device);
|
|
dasd_schedule_device_bh(device);
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
|
|
|
|
int dasd_generic_path_operational(struct dasd_device *device)
|
|
{
|
|
dev_info(&device->cdev->dev, "A channel path to the device has become "
|
|
"operational\n");
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
|
|
dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
|
|
if (device->stopped & DASD_UNRESUMED_PM) {
|
|
dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
|
|
dasd_restore_device(device);
|
|
return 1;
|
|
}
|
|
dasd_schedule_device_bh(device);
|
|
if (device->block)
|
|
dasd_schedule_block_bh(device->block);
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
|
|
|
|
int dasd_generic_notify(struct ccw_device *cdev, int event)
|
|
{
|
|
struct dasd_device *device;
|
|
int ret;
|
|
|
|
device = dasd_device_from_cdev_locked(cdev);
|
|
if (IS_ERR(device))
|
|
return 0;
|
|
ret = 0;
|
|
switch (event) {
|
|
case CIO_GONE:
|
|
case CIO_BOXED:
|
|
case CIO_NO_PATH:
|
|
device->path_data.opm = 0;
|
|
device->path_data.ppm = 0;
|
|
device->path_data.npm = 0;
|
|
ret = dasd_generic_last_path_gone(device);
|
|
break;
|
|
case CIO_OPER:
|
|
ret = 1;
|
|
if (device->path_data.opm)
|
|
ret = dasd_generic_path_operational(device);
|
|
break;
|
|
}
|
|
dasd_put_device(device);
|
|
return ret;
|
|
}
|
|
|
|
void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
|
|
{
|
|
int chp;
|
|
__u8 oldopm, eventlpm;
|
|
struct dasd_device *device;
|
|
|
|
device = dasd_device_from_cdev_locked(cdev);
|
|
if (IS_ERR(device))
|
|
return;
|
|
for (chp = 0; chp < 8; chp++) {
|
|
eventlpm = 0x80 >> chp;
|
|
if (path_event[chp] & PE_PATH_GONE) {
|
|
oldopm = device->path_data.opm;
|
|
device->path_data.opm &= ~eventlpm;
|
|
device->path_data.ppm &= ~eventlpm;
|
|
device->path_data.npm &= ~eventlpm;
|
|
if (oldopm && !device->path_data.opm)
|
|
dasd_generic_last_path_gone(device);
|
|
}
|
|
if (path_event[chp] & PE_PATH_AVAILABLE) {
|
|
device->path_data.opm &= ~eventlpm;
|
|
device->path_data.ppm &= ~eventlpm;
|
|
device->path_data.npm &= ~eventlpm;
|
|
device->path_data.tbvpm |= eventlpm;
|
|
dasd_schedule_device_bh(device);
|
|
}
|
|
}
|
|
dasd_put_device(device);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_path_event);
|
|
|
|
int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
|
|
{
|
|
if (!device->path_data.opm && lpm) {
|
|
device->path_data.opm = lpm;
|
|
dasd_generic_path_operational(device);
|
|
} else
|
|
device->path_data.opm |= lpm;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
|
|
|
|
|
|
int dasd_generic_pm_freeze(struct ccw_device *cdev)
|
|
{
|
|
struct dasd_ccw_req *cqr, *n;
|
|
int rc;
|
|
struct list_head freeze_queue;
|
|
struct dasd_device *device = dasd_device_from_cdev(cdev);
|
|
|
|
if (IS_ERR(device))
|
|
return PTR_ERR(device);
|
|
|
|
if (device->discipline->freeze)
|
|
rc = device->discipline->freeze(device);
|
|
|
|
/* disallow new I/O */
|
|
dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
|
|
/* clear active requests */
|
|
INIT_LIST_HEAD(&freeze_queue);
|
|
spin_lock_irq(get_ccwdev_lock(cdev));
|
|
rc = 0;
|
|
list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
|
|
/* Check status and move request to flush_queue */
|
|
if (cqr->status == DASD_CQR_IN_IO) {
|
|
rc = device->discipline->term_IO(cqr);
|
|
if (rc) {
|
|
/* unable to terminate requeust */
|
|
dev_err(&device->cdev->dev,
|
|
"Unable to terminate request %p "
|
|
"on suspend\n", cqr);
|
|
spin_unlock_irq(get_ccwdev_lock(cdev));
|
|
dasd_put_device(device);
|
|
return rc;
|
|
}
|
|
}
|
|
list_move_tail(&cqr->devlist, &freeze_queue);
|
|
}
|
|
|
|
spin_unlock_irq(get_ccwdev_lock(cdev));
|
|
|
|
list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
|
|
wait_event(dasd_flush_wq,
|
|
(cqr->status != DASD_CQR_CLEAR_PENDING));
|
|
if (cqr->status == DASD_CQR_CLEARED)
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
}
|
|
/* move freeze_queue to start of the ccw_queue */
|
|
spin_lock_irq(get_ccwdev_lock(cdev));
|
|
list_splice_tail(&freeze_queue, &device->ccw_queue);
|
|
spin_unlock_irq(get_ccwdev_lock(cdev));
|
|
|
|
dasd_put_device(device);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
|
|
|
|
int dasd_generic_restore_device(struct ccw_device *cdev)
|
|
{
|
|
struct dasd_device *device = dasd_device_from_cdev(cdev);
|
|
int rc = 0;
|
|
|
|
if (IS_ERR(device))
|
|
return PTR_ERR(device);
|
|
|
|
/* allow new IO again */
|
|
dasd_device_remove_stop_bits(device,
|
|
(DASD_STOPPED_PM | DASD_UNRESUMED_PM));
|
|
|
|
dasd_schedule_device_bh(device);
|
|
|
|
/*
|
|
* call discipline restore function
|
|
* if device is stopped do nothing e.g. for disconnected devices
|
|
*/
|
|
if (device->discipline->restore && !(device->stopped))
|
|
rc = device->discipline->restore(device);
|
|
if (rc || device->stopped)
|
|
/*
|
|
* if the resume failed for the DASD we put it in
|
|
* an UNRESUMED stop state
|
|
*/
|
|
device->stopped |= DASD_UNRESUMED_PM;
|
|
|
|
if (device->block)
|
|
dasd_schedule_block_bh(device->block);
|
|
|
|
dasd_put_device(device);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
|
|
|
|
static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
|
|
void *rdc_buffer,
|
|
int rdc_buffer_size,
|
|
int magic)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
struct ccw1 *ccw;
|
|
unsigned long *idaw;
|
|
|
|
cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
|
|
|
|
if (IS_ERR(cqr)) {
|
|
/* internal error 13 - Allocating the RDC request failed*/
|
|
dev_err(&device->cdev->dev,
|
|
"An error occurred in the DASD device driver, "
|
|
"reason=%s\n", "13");
|
|
return cqr;
|
|
}
|
|
|
|
ccw = cqr->cpaddr;
|
|
ccw->cmd_code = CCW_CMD_RDC;
|
|
if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
|
|
idaw = (unsigned long *) (cqr->data);
|
|
ccw->cda = (__u32)(addr_t) idaw;
|
|
ccw->flags = CCW_FLAG_IDA;
|
|
idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
|
|
} else {
|
|
ccw->cda = (__u32)(addr_t) rdc_buffer;
|
|
ccw->flags = 0;
|
|
}
|
|
|
|
ccw->count = rdc_buffer_size;
|
|
cqr->startdev = device;
|
|
cqr->memdev = device;
|
|
cqr->expires = 10*HZ;
|
|
cqr->retries = 256;
|
|
cqr->buildclk = get_clock();
|
|
cqr->status = DASD_CQR_FILLED;
|
|
return cqr;
|
|
}
|
|
|
|
|
|
int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
|
|
void *rdc_buffer, int rdc_buffer_size)
|
|
{
|
|
int ret;
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
|
|
magic);
|
|
if (IS_ERR(cqr))
|
|
return PTR_ERR(cqr);
|
|
|
|
ret = dasd_sleep_on(cqr);
|
|
dasd_sfree_request(cqr, cqr->memdev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
|
|
|
|
/*
|
|
* In command mode and transport mode we need to look for sense
|
|
* data in different places. The sense data itself is allways
|
|
* an array of 32 bytes, so we can unify the sense data access
|
|
* for both modes.
|
|
*/
|
|
char *dasd_get_sense(struct irb *irb)
|
|
{
|
|
struct tsb *tsb = NULL;
|
|
char *sense = NULL;
|
|
|
|
if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
|
|
if (irb->scsw.tm.tcw)
|
|
tsb = tcw_get_tsb((struct tcw *)(unsigned long)
|
|
irb->scsw.tm.tcw);
|
|
if (tsb && tsb->length == 64 && tsb->flags)
|
|
switch (tsb->flags & 0x07) {
|
|
case 1: /* tsa_iostat */
|
|
sense = tsb->tsa.iostat.sense;
|
|
break;
|
|
case 2: /* tsa_ddpc */
|
|
sense = tsb->tsa.ddpc.sense;
|
|
break;
|
|
default:
|
|
/* currently we don't use interrogate data */
|
|
break;
|
|
}
|
|
} else if (irb->esw.esw0.erw.cons) {
|
|
sense = irb->ecw;
|
|
}
|
|
return sense;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_get_sense);
|
|
|
|
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);
|
|
|
|
/* 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);
|
|
|
|
EXPORT_SYMBOL(dasd_debug_area);
|
|
EXPORT_SYMBOL(dasd_diag_discipline_pointer);
|
|
|
|
EXPORT_SYMBOL(dasd_add_request_head);
|
|
EXPORT_SYMBOL(dasd_add_request_tail);
|
|
EXPORT_SYMBOL(dasd_cancel_req);
|
|
EXPORT_SYMBOL(dasd_device_clear_timer);
|
|
EXPORT_SYMBOL(dasd_block_clear_timer);
|
|
EXPORT_SYMBOL(dasd_enable_device);
|
|
EXPORT_SYMBOL(dasd_int_handler);
|
|
EXPORT_SYMBOL(dasd_kfree_request);
|
|
EXPORT_SYMBOL(dasd_kick_device);
|
|
EXPORT_SYMBOL(dasd_kmalloc_request);
|
|
EXPORT_SYMBOL(dasd_schedule_device_bh);
|
|
EXPORT_SYMBOL(dasd_schedule_block_bh);
|
|
EXPORT_SYMBOL(dasd_set_target_state);
|
|
EXPORT_SYMBOL(dasd_device_set_timer);
|
|
EXPORT_SYMBOL(dasd_block_set_timer);
|
|
EXPORT_SYMBOL(dasd_sfree_request);
|
|
EXPORT_SYMBOL(dasd_sleep_on);
|
|
EXPORT_SYMBOL(dasd_sleep_on_immediatly);
|
|
EXPORT_SYMBOL(dasd_sleep_on_interruptible);
|
|
EXPORT_SYMBOL(dasd_smalloc_request);
|
|
EXPORT_SYMBOL(dasd_start_IO);
|
|
EXPORT_SYMBOL(dasd_term_IO);
|
|
|
|
EXPORT_SYMBOL_GPL(dasd_generic_probe);
|
|
EXPORT_SYMBOL_GPL(dasd_generic_remove);
|
|
EXPORT_SYMBOL_GPL(dasd_generic_notify);
|
|
EXPORT_SYMBOL_GPL(dasd_generic_set_online);
|
|
EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
|
|
EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
|
|
EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
|
|
EXPORT_SYMBOL_GPL(dasd_alloc_block);
|
|
EXPORT_SYMBOL_GPL(dasd_free_block);
|