mirror of https://gitee.com/openkylin/linux.git
2253 lines
57 KiB
C
2253 lines
57 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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* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
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*
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*/
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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 <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/todclk.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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/*
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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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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_device * device);
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static void dasd_setup_queue(struct dasd_device * device);
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static void dasd_free_queue(struct dasd_device * device);
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static void dasd_flush_request_queue(struct dasd_device *);
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static int dasd_flush_ccw_queue(struct dasd_device *, int);
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static void dasd_tasklet(struct dasd_device *);
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static void do_kick_device(struct work_struct *);
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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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/*
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* Allocate memory for a new device structure.
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*/
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struct dasd_device *
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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 == NULL)
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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(&device->open_count, -1);
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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 == NULL) {
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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 == NULL) {
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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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spin_lock_init(&device->request_queue_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_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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INIT_WORK(&device->kick_work, do_kick_device);
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device->state = DASD_STATE_NEW;
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device->target = DASD_STATE_NEW;
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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
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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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* Make a new device known to the system.
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*/
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static int
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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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rc = dasd_alloc_queue(device);
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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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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
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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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module_put(device->discipline->owner);
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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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dasd_free_queue(device);
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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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/*
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* Request the irq line for the device.
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*/
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static int
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dasd_state_known_to_basic(struct dasd_device * device)
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{
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int rc;
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/* Allocate and register gendisk structure. */
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rc = dasd_gendisk_alloc(device);
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if (rc)
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return rc;
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/* register 'device' debug area, used for all DBF_DEV_XXX calls */
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device->debug_area = debug_register(device->cdev->dev.bus_id, 1, 2,
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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
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dasd_state_basic_to_known(struct dasd_device * device)
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{
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int rc;
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dasd_gendisk_free(device);
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rc = dasd_flush_ccw_queue(device, 1);
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if (rc)
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return rc;
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dasd_clear_timer(device);
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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
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dasd_state_basic_to_ready(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->discipline->do_analysis != NULL)
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rc = device->discipline->do_analysis(device);
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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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/* make disk known with correct capacity */
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dasd_setup_queue(device);
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set_capacity(device->gdp, device->blocks << device->s2b_shift);
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device->state = DASD_STATE_READY;
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rc = dasd_scan_partitions(device);
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if (rc)
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device->state = DASD_STATE_BASIC;
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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
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dasd_state_ready_to_basic(struct dasd_device * device)
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{
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int rc;
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rc = dasd_flush_ccw_queue(device, 0);
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if (rc)
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return rc;
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dasd_destroy_partitions(device);
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dasd_flush_request_queue(device);
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device->blocks = 0;
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device->bp_block = 0;
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device->s2b_shift = 0;
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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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* Back to basic.
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*/
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static int
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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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device->state = DASD_STATE_ONLINE;
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dasd_schedule_bh(device);
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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
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dasd_state_online_to_ready(struct dasd_device * device)
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{
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device->state = DASD_STATE_READY;
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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
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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
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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 &&
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device->state == DASD_STATE_READY &&
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device->target <= DASD_STATE_BASIC)
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rc = dasd_state_ready_to_basic(device);
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if (!rc &&
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device->state == DASD_STATE_UNFMT &&
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device->target <= DASD_STATE_BASIC)
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rc = dasd_state_unfmt_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_KNOWN)
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rc = dasd_state_basic_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_NEW)
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rc = dasd_state_known_to_new(device);
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return rc;
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}
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/*
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* This is the main startup/shutdown routine.
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*/
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static void
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dasd_change_state(struct dasd_device *device)
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{
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int rc;
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if (device->state == device->target)
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/* Already where we want to go today... */
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return;
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if (device->state < device->target)
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rc = dasd_increase_state(device);
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else
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rc = dasd_decrease_state(device);
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if (rc && rc != -EAGAIN)
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device->target = device->state;
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if (device->state == device->target)
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wake_up(&dasd_init_waitq);
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}
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/*
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* Kick starter for devices that did not complete the startup/shutdown
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* procedure or were sleeping because of a pending state.
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* dasd_kick_device will schedule a call do do_kick_device to the kernel
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* event daemon.
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*/
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static void
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do_kick_device(struct work_struct *work)
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{
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struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
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dasd_change_state(device);
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dasd_schedule_bh(device);
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dasd_put_device(device);
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}
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void
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dasd_kick_device(struct dasd_device *device)
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{
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dasd_get_device(device);
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/* queue call to dasd_kick_device to the kernel event daemon. */
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schedule_work(&device->kick_work);
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}
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/*
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* Set the target state for a device and starts the state change.
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*/
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void
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dasd_set_target_state(struct dasd_device *device, int target)
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{
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/* If we are in probeonly mode stop at DASD_STATE_READY. */
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if (dasd_probeonly && target > DASD_STATE_READY)
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target = DASD_STATE_READY;
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if (device->target != target) {
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if (device->state == target)
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wake_up(&dasd_init_waitq);
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device->target = target;
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}
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if (device->state != device->target)
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dasd_change_state(device);
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}
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/*
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* Enable devices with device numbers in [from..to].
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*/
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static inline int
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_wait_for_device(struct dasd_device *device)
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{
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return (device->state == device->target);
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}
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void
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dasd_enable_device(struct dasd_device *device)
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{
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dasd_set_target_state(device, DASD_STATE_ONLINE);
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if (device->state <= DASD_STATE_KNOWN)
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/* No discipline for device found. */
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dasd_set_target_state(device, DASD_STATE_NEW);
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/* Now wait for the devices to come up. */
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wait_event(dasd_init_waitq, _wait_for_device(device));
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}
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/*
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* SECTION: device operation (interrupt handler, start i/o, term i/o ...)
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*/
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#ifdef CONFIG_DASD_PROFILE
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struct dasd_profile_info_t dasd_global_profile;
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unsigned int dasd_profile_level = DASD_PROFILE_OFF;
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/*
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* Increments counter in global and local profiling structures.
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*/
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#define dasd_profile_counter(value, counter, device) \
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{ \
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int index; \
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for (index = 0; index < 31 && value >> (2+index); index++); \
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dasd_global_profile.counter[index]++; \
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device->profile.counter[index]++; \
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}
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/*
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* Add profiling information for cqr before execution.
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*/
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static void
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dasd_profile_start(struct dasd_device *device, struct dasd_ccw_req * cqr,
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struct request *req)
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{
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struct list_head *l;
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unsigned int counter;
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if (dasd_profile_level != DASD_PROFILE_ON)
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return;
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/* count the length of the chanq for statistics */
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counter = 0;
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list_for_each(l, &device->ccw_queue)
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if (++counter >= 31)
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break;
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dasd_global_profile.dasd_io_nr_req[counter]++;
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device->profile.dasd_io_nr_req[counter]++;
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}
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/*
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* Add profiling information for cqr after execution.
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*/
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static void
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dasd_profile_end(struct dasd_device *device, struct dasd_ccw_req * cqr,
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struct request *req)
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{
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long strtime, irqtime, endtime, tottime; /* in microseconds */
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long tottimeps, sectors;
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if (dasd_profile_level != DASD_PROFILE_ON)
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return;
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sectors = req->nr_sectors;
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if (!cqr->buildclk || !cqr->startclk ||
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!cqr->stopclk || !cqr->endclk ||
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!sectors)
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return;
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strtime = ((cqr->startclk - cqr->buildclk) >> 12);
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irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
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endtime = ((cqr->endclk - cqr->stopclk) >> 12);
|
|
tottime = ((cqr->endclk - cqr->buildclk) >> 12);
|
|
tottimeps = tottime / sectors;
|
|
|
|
if (!dasd_global_profile.dasd_io_reqs)
|
|
memset(&dasd_global_profile, 0,
|
|
sizeof (struct dasd_profile_info_t));
|
|
dasd_global_profile.dasd_io_reqs++;
|
|
dasd_global_profile.dasd_io_sects += sectors;
|
|
|
|
if (!device->profile.dasd_io_reqs)
|
|
memset(&device->profile, 0,
|
|
sizeof (struct dasd_profile_info_t));
|
|
device->profile.dasd_io_reqs++;
|
|
device->profile.dasd_io_sects += sectors;
|
|
|
|
dasd_profile_counter(sectors, dasd_io_secs, device);
|
|
dasd_profile_counter(tottime, dasd_io_times, device);
|
|
dasd_profile_counter(tottimeps, dasd_io_timps, device);
|
|
dasd_profile_counter(strtime, dasd_io_time1, device);
|
|
dasd_profile_counter(irqtime, dasd_io_time2, device);
|
|
dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, device);
|
|
dasd_profile_counter(endtime, dasd_io_time3, device);
|
|
}
|
|
#else
|
|
#define dasd_profile_start(device, cqr, req) do {} while (0)
|
|
#define dasd_profile_end(device, cqr, req) do {} while (0)
|
|
#endif /* CONFIG_DASD_PROFILE */
|
|
|
|
/*
|
|
* Allocate memory for a channel program with 'cplength' channel
|
|
* command words and 'datasize' additional space. There are two
|
|
* variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
|
|
* memory and 2) dasd_smalloc_request uses the static ccw memory
|
|
* that gets allocated for each device.
|
|
*/
|
|
struct dasd_ccw_req *
|
|
dasd_kmalloc_request(char *magic, int cplength, int datasize,
|
|
struct dasd_device * device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
/* Sanity checks */
|
|
BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
|
|
(cplength*sizeof(struct ccw1)) > PAGE_SIZE);
|
|
|
|
cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
|
|
if (cqr == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
cqr->cpaddr = NULL;
|
|
if (cplength > 0) {
|
|
cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
|
|
GFP_ATOMIC | GFP_DMA);
|
|
if (cqr->cpaddr == NULL) {
|
|
kfree(cqr);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
}
|
|
cqr->data = NULL;
|
|
if (datasize > 0) {
|
|
cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
|
|
if (cqr->data == NULL) {
|
|
kfree(cqr->cpaddr);
|
|
kfree(cqr);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
}
|
|
strncpy((char *) &cqr->magic, magic, 4);
|
|
ASCEBC((char *) &cqr->magic, 4);
|
|
set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
|
|
dasd_get_device(device);
|
|
return cqr;
|
|
}
|
|
|
|
struct dasd_ccw_req *
|
|
dasd_smalloc_request(char *magic, int cplength, int datasize,
|
|
struct dasd_device * device)
|
|
{
|
|
unsigned long flags;
|
|
struct dasd_ccw_req *cqr;
|
|
char *data;
|
|
int size;
|
|
|
|
/* Sanity checks */
|
|
BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
|
|
(cplength*sizeof(struct ccw1)) > PAGE_SIZE);
|
|
|
|
size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
|
|
if (cplength > 0)
|
|
size += cplength * sizeof(struct ccw1);
|
|
if (datasize > 0)
|
|
size += datasize;
|
|
spin_lock_irqsave(&device->mem_lock, flags);
|
|
cqr = (struct dasd_ccw_req *)
|
|
dasd_alloc_chunk(&device->ccw_chunks, size);
|
|
spin_unlock_irqrestore(&device->mem_lock, flags);
|
|
if (cqr == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
memset(cqr, 0, sizeof(struct dasd_ccw_req));
|
|
data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
|
|
cqr->cpaddr = NULL;
|
|
if (cplength > 0) {
|
|
cqr->cpaddr = (struct ccw1 *) data;
|
|
data += cplength*sizeof(struct ccw1);
|
|
memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
|
|
}
|
|
cqr->data = NULL;
|
|
if (datasize > 0) {
|
|
cqr->data = data;
|
|
memset(cqr->data, 0, datasize);
|
|
}
|
|
strncpy((char *) &cqr->magic, magic, 4);
|
|
ASCEBC((char *) &cqr->magic, 4);
|
|
set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
|
|
dasd_get_device(device);
|
|
return cqr;
|
|
}
|
|
|
|
/*
|
|
* Free memory of a channel program. This function needs to free all the
|
|
* idal lists that might have been created by dasd_set_cda and the
|
|
* struct dasd_ccw_req itself.
|
|
*/
|
|
void
|
|
dasd_kfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
|
|
{
|
|
#ifdef CONFIG_64BIT
|
|
struct ccw1 *ccw;
|
|
|
|
/* Clear any idals used for the request. */
|
|
ccw = cqr->cpaddr;
|
|
do {
|
|
clear_normalized_cda(ccw);
|
|
} while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
|
|
#endif
|
|
kfree(cqr->cpaddr);
|
|
kfree(cqr->data);
|
|
kfree(cqr);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
void
|
|
dasd_sfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&device->mem_lock, flags);
|
|
dasd_free_chunk(&device->ccw_chunks, cqr);
|
|
spin_unlock_irqrestore(&device->mem_lock, flags);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
/*
|
|
* Check discipline magic in cqr.
|
|
*/
|
|
static inline int
|
|
dasd_check_cqr(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
|
|
if (cqr == NULL)
|
|
return -EINVAL;
|
|
device = cqr->device;
|
|
if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
|
|
DEV_MESSAGE(KERN_WARNING, device,
|
|
" dasd_ccw_req 0x%08x magic doesn't match"
|
|
" discipline 0x%08x",
|
|
cqr->magic,
|
|
*(unsigned int *) device->discipline->name);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Terminate the current i/o and set the request to clear_pending.
|
|
* Timer keeps device runnig.
|
|
* ccw_device_clear can fail if the i/o subsystem
|
|
* is in a bad mood.
|
|
*/
|
|
int
|
|
dasd_term_IO(struct dasd_ccw_req * cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
int retries, rc;
|
|
|
|
/* Check the cqr */
|
|
rc = dasd_check_cqr(cqr);
|
|
if (rc)
|
|
return rc;
|
|
retries = 0;
|
|
device = (struct dasd_device *) cqr->device;
|
|
while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
|
|
rc = ccw_device_clear(device->cdev, (long) cqr);
|
|
switch (rc) {
|
|
case 0: /* termination successful */
|
|
cqr->retries--;
|
|
cqr->status = DASD_CQR_CLEAR;
|
|
cqr->stopclk = get_clock();
|
|
cqr->starttime = 0;
|
|
DBF_DEV_EVENT(DBF_DEBUG, device,
|
|
"terminate cqr %p successful",
|
|
cqr);
|
|
break;
|
|
case -ENODEV:
|
|
DBF_DEV_EVENT(DBF_ERR, device, "%s",
|
|
"device gone, retry");
|
|
break;
|
|
case -EIO:
|
|
DBF_DEV_EVENT(DBF_ERR, device, "%s",
|
|
"I/O error, retry");
|
|
break;
|
|
case -EINVAL:
|
|
case -EBUSY:
|
|
DBF_DEV_EVENT(DBF_ERR, device, "%s",
|
|
"device busy, retry later");
|
|
break;
|
|
default:
|
|
DEV_MESSAGE(KERN_ERR, device,
|
|
"line %d unknown RC=%d, please "
|
|
"report to linux390@de.ibm.com",
|
|
__LINE__, rc);
|
|
BUG();
|
|
break;
|
|
}
|
|
retries++;
|
|
}
|
|
dasd_schedule_bh(device);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Start the i/o. This start_IO can fail if the channel is really busy.
|
|
* In that case set up a timer to start the request later.
|
|
*/
|
|
int
|
|
dasd_start_IO(struct dasd_ccw_req * cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
int rc;
|
|
|
|
/* Check the cqr */
|
|
rc = dasd_check_cqr(cqr);
|
|
if (rc)
|
|
return rc;
|
|
device = (struct dasd_device *) cqr->device;
|
|
if (cqr->retries < 0) {
|
|
DEV_MESSAGE(KERN_DEBUG, device,
|
|
"start_IO: request %p (%02x/%i) - no retry left.",
|
|
cqr, cqr->status, cqr->retries);
|
|
cqr->status = DASD_CQR_FAILED;
|
|
return -EIO;
|
|
}
|
|
cqr->startclk = get_clock();
|
|
cqr->starttime = jiffies;
|
|
cqr->retries--;
|
|
rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr,
|
|
cqr->lpm, 0);
|
|
switch (rc) {
|
|
case 0:
|
|
cqr->status = DASD_CQR_IN_IO;
|
|
DBF_DEV_EVENT(DBF_DEBUG, device,
|
|
"start_IO: request %p started successful",
|
|
cqr);
|
|
break;
|
|
case -EBUSY:
|
|
DBF_DEV_EVENT(DBF_ERR, device, "%s",
|
|
"start_IO: device busy, retry later");
|
|
break;
|
|
case -ETIMEDOUT:
|
|
DBF_DEV_EVENT(DBF_ERR, device, "%s",
|
|
"start_IO: request timeout, retry later");
|
|
break;
|
|
case -EACCES:
|
|
/* -EACCES indicates that the request used only a
|
|
* subset of the available pathes and all these
|
|
* pathes are gone.
|
|
* Do a retry with all available pathes.
|
|
*/
|
|
cqr->lpm = LPM_ANYPATH;
|
|
DBF_DEV_EVENT(DBF_ERR, device, "%s",
|
|
"start_IO: selected pathes gone,"
|
|
" retry on all pathes");
|
|
break;
|
|
case -ENODEV:
|
|
case -EIO:
|
|
DBF_DEV_EVENT(DBF_ERR, device, "%s",
|
|
"start_IO: device gone, retry");
|
|
break;
|
|
default:
|
|
DEV_MESSAGE(KERN_ERR, device,
|
|
"line %d unknown RC=%d, please report"
|
|
" to linux390@de.ibm.com", __LINE__, rc);
|
|
BUG();
|
|
break;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Timeout function for dasd devices. This is used for different purposes
|
|
* 1) missing interrupt handler for normal operation
|
|
* 2) delayed start of request where start_IO failed with -EBUSY
|
|
* 3) timeout for missing state change interrupts
|
|
* The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
|
|
* DASD_CQR_QUEUED for 2) and 3).
|
|
*/
|
|
static void
|
|
dasd_timeout_device(unsigned long ptr)
|
|
{
|
|
unsigned long flags;
|
|
struct dasd_device *device;
|
|
|
|
device = (struct dasd_device *) ptr;
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
|
/* re-activate request queue */
|
|
device->stopped &= ~DASD_STOPPED_PENDING;
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
dasd_schedule_bh(device);
|
|
}
|
|
|
|
/*
|
|
* Setup timeout for a device in jiffies.
|
|
*/
|
|
void
|
|
dasd_set_timer(struct dasd_device *device, int expires)
|
|
{
|
|
if (expires == 0) {
|
|
if (timer_pending(&device->timer))
|
|
del_timer(&device->timer);
|
|
return;
|
|
}
|
|
if (timer_pending(&device->timer)) {
|
|
if (mod_timer(&device->timer, jiffies + expires))
|
|
return;
|
|
}
|
|
device->timer.function = dasd_timeout_device;
|
|
device->timer.data = (unsigned long) device;
|
|
device->timer.expires = jiffies + expires;
|
|
add_timer(&device->timer);
|
|
}
|
|
|
|
/*
|
|
* Clear timeout for a device.
|
|
*/
|
|
void
|
|
dasd_clear_timer(struct dasd_device *device)
|
|
{
|
|
if (timer_pending(&device->timer))
|
|
del_timer(&device->timer);
|
|
}
|
|
|
|
static void
|
|
dasd_handle_killed_request(struct ccw_device *cdev, unsigned long intparm)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
struct dasd_device *device;
|
|
|
|
cqr = (struct dasd_ccw_req *) intparm;
|
|
if (cqr->status != DASD_CQR_IN_IO) {
|
|
MESSAGE(KERN_DEBUG,
|
|
"invalid status in handle_killed_request: "
|
|
"bus_id %s, status %02x",
|
|
cdev->dev.bus_id, cqr->status);
|
|
return;
|
|
}
|
|
|
|
device = (struct dasd_device *) cqr->device;
|
|
if (device == NULL ||
|
|
device != dasd_device_from_cdev_locked(cdev) ||
|
|
strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
|
|
MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s",
|
|
cdev->dev.bus_id);
|
|
return;
|
|
}
|
|
|
|
/* Schedule request to be retried. */
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
|
|
dasd_clear_timer(device);
|
|
dasd_schedule_bh(device);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
static void
|
|
dasd_handle_state_change_pending(struct dasd_device *device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
struct list_head *l, *n;
|
|
|
|
/* First of all start sense subsystem status request. */
|
|
dasd_eer_snss(device);
|
|
|
|
device->stopped &= ~DASD_STOPPED_PENDING;
|
|
|
|
/* restart all 'running' IO on queue */
|
|
list_for_each_safe(l, n, &device->ccw_queue) {
|
|
cqr = list_entry(l, struct dasd_ccw_req, list);
|
|
if (cqr->status == DASD_CQR_IN_IO) {
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
}
|
|
}
|
|
dasd_clear_timer(device);
|
|
dasd_schedule_bh(device);
|
|
}
|
|
|
|
/*
|
|
* Interrupt handler for "normal" ssch-io based dasd devices.
|
|
*/
|
|
void
|
|
dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
|
|
struct irb *irb)
|
|
{
|
|
struct dasd_ccw_req *cqr, *next;
|
|
struct dasd_device *device;
|
|
unsigned long long now;
|
|
int expires;
|
|
dasd_era_t era;
|
|
char mask;
|
|
|
|
if (IS_ERR(irb)) {
|
|
switch (PTR_ERR(irb)) {
|
|
case -EIO:
|
|
dasd_handle_killed_request(cdev, intparm);
|
|
break;
|
|
case -ETIMEDOUT:
|
|
printk(KERN_WARNING"%s(%s): request timed out\n",
|
|
__FUNCTION__, cdev->dev.bus_id);
|
|
//FIXME - dasd uses own timeout interface...
|
|
break;
|
|
default:
|
|
printk(KERN_WARNING"%s(%s): unknown error %ld\n",
|
|
__FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb));
|
|
}
|
|
return;
|
|
}
|
|
|
|
now = get_clock();
|
|
|
|
DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x",
|
|
cdev->dev.bus_id, ((irb->scsw.cstat<<8)|irb->scsw.dstat),
|
|
(unsigned int) intparm);
|
|
|
|
/* first of all check for state change pending interrupt */
|
|
mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
|
|
if ((irb->scsw.dstat & mask) == mask) {
|
|
device = dasd_device_from_cdev_locked(cdev);
|
|
if (!IS_ERR(device)) {
|
|
dasd_handle_state_change_pending(device);
|
|
dasd_put_device(device);
|
|
}
|
|
return;
|
|
}
|
|
|
|
cqr = (struct dasd_ccw_req *) intparm;
|
|
|
|
/* check for unsolicited interrupts */
|
|
if (cqr == NULL) {
|
|
MESSAGE(KERN_DEBUG,
|
|
"unsolicited interrupt received: bus_id %s",
|
|
cdev->dev.bus_id);
|
|
return;
|
|
}
|
|
|
|
device = (struct dasd_device *) cqr->device;
|
|
if (device == NULL ||
|
|
strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
|
|
MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s",
|
|
cdev->dev.bus_id);
|
|
return;
|
|
}
|
|
|
|
/* Check for clear pending */
|
|
if (cqr->status == DASD_CQR_CLEAR &&
|
|
irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) {
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
dasd_clear_timer(device);
|
|
wake_up(&dasd_flush_wq);
|
|
dasd_schedule_bh(device);
|
|
return;
|
|
}
|
|
|
|
/* check status - the request might have been killed by dyn detach */
|
|
if (cqr->status != DASD_CQR_IN_IO) {
|
|
MESSAGE(KERN_DEBUG,
|
|
"invalid status: bus_id %s, status %02x",
|
|
cdev->dev.bus_id, cqr->status);
|
|
return;
|
|
}
|
|
DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p",
|
|
((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr);
|
|
|
|
/* Find out the appropriate era_action. */
|
|
if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC)
|
|
era = dasd_era_fatal;
|
|
else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
|
|
irb->scsw.cstat == 0 &&
|
|
!irb->esw.esw0.erw.cons)
|
|
era = dasd_era_none;
|
|
else if (irb->esw.esw0.erw.cons)
|
|
era = device->discipline->examine_error(cqr, irb);
|
|
else
|
|
era = dasd_era_recover;
|
|
|
|
DBF_DEV_EVENT(DBF_DEBUG, device, "era_code %d", era);
|
|
expires = 0;
|
|
if (era == dasd_era_none) {
|
|
cqr->status = DASD_CQR_DONE;
|
|
cqr->stopclk = now;
|
|
/* Start first request on queue if possible -> fast_io. */
|
|
if (cqr->list.next != &device->ccw_queue) {
|
|
next = list_entry(cqr->list.next,
|
|
struct dasd_ccw_req, list);
|
|
if ((next->status == DASD_CQR_QUEUED) &&
|
|
(!device->stopped)) {
|
|
if (device->discipline->start_IO(next) == 0)
|
|
expires = next->expires;
|
|
else
|
|
DEV_MESSAGE(KERN_DEBUG, device, "%s",
|
|
"Interrupt fastpath "
|
|
"failed!");
|
|
}
|
|
}
|
|
} else { /* error */
|
|
memcpy(&cqr->irb, irb, sizeof (struct irb));
|
|
if (device->features & DASD_FEATURE_ERPLOG) {
|
|
/* dump sense data */
|
|
dasd_log_sense(cqr, irb);
|
|
}
|
|
switch (era) {
|
|
case dasd_era_fatal:
|
|
cqr->status = DASD_CQR_FAILED;
|
|
cqr->stopclk = now;
|
|
break;
|
|
case dasd_era_recover:
|
|
cqr->status = DASD_CQR_ERROR;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
if (expires != 0)
|
|
dasd_set_timer(device, expires);
|
|
else
|
|
dasd_clear_timer(device);
|
|
dasd_schedule_bh(device);
|
|
}
|
|
|
|
/*
|
|
* posts the buffer_cache about a finalized request
|
|
*/
|
|
static inline void
|
|
dasd_end_request(struct request *req, int uptodate)
|
|
{
|
|
if (end_that_request_first(req, uptodate, req->hard_nr_sectors))
|
|
BUG();
|
|
add_disk_randomness(req->rq_disk);
|
|
end_that_request_last(req, uptodate);
|
|
}
|
|
|
|
/*
|
|
* Process finished error recovery ccw.
|
|
*/
|
|
static inline void
|
|
__dasd_process_erp(struct dasd_device *device, struct dasd_ccw_req *cqr)
|
|
{
|
|
dasd_erp_fn_t erp_fn;
|
|
|
|
if (cqr->status == DASD_CQR_DONE)
|
|
DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
|
|
else
|
|
DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful");
|
|
erp_fn = device->discipline->erp_postaction(cqr);
|
|
erp_fn(cqr);
|
|
}
|
|
|
|
/*
|
|
* Process ccw request queue.
|
|
*/
|
|
static void
|
|
__dasd_process_ccw_queue(struct dasd_device * device,
|
|
struct list_head *final_queue)
|
|
{
|
|
struct list_head *l, *n;
|
|
struct dasd_ccw_req *cqr;
|
|
dasd_erp_fn_t erp_fn;
|
|
|
|
restart:
|
|
/* Process request with final status. */
|
|
list_for_each_safe(l, n, &device->ccw_queue) {
|
|
cqr = list_entry(l, struct dasd_ccw_req, list);
|
|
/* Stop list processing at the first non-final request. */
|
|
if (cqr->status != DASD_CQR_DONE &&
|
|
cqr->status != DASD_CQR_FAILED &&
|
|
cqr->status != DASD_CQR_ERROR)
|
|
break;
|
|
/* Process requests with DASD_CQR_ERROR */
|
|
if (cqr->status == DASD_CQR_ERROR) {
|
|
if (cqr->irb.scsw.fctl & SCSW_FCTL_HALT_FUNC) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
cqr->stopclk = get_clock();
|
|
} else {
|
|
if (cqr->irb.esw.esw0.erw.cons &&
|
|
test_bit(DASD_CQR_FLAGS_USE_ERP,
|
|
&cqr->flags)) {
|
|
erp_fn = device->discipline->
|
|
erp_action(cqr);
|
|
erp_fn(cqr);
|
|
} else
|
|
dasd_default_erp_action(cqr);
|
|
}
|
|
goto restart;
|
|
}
|
|
|
|
/* First of all call extended error reporting. */
|
|
if (dasd_eer_enabled(device) &&
|
|
cqr->status == DASD_CQR_FAILED) {
|
|
dasd_eer_write(device, cqr, DASD_EER_FATALERROR);
|
|
|
|
/* restart request */
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
cqr->retries = 255;
|
|
device->stopped |= DASD_STOPPED_QUIESCE;
|
|
goto restart;
|
|
}
|
|
|
|
/* Process finished ERP request. */
|
|
if (cqr->refers) {
|
|
__dasd_process_erp(device, cqr);
|
|
goto restart;
|
|
}
|
|
|
|
/* Rechain finished requests to final queue */
|
|
cqr->endclk = get_clock();
|
|
list_move_tail(&cqr->list, final_queue);
|
|
}
|
|
}
|
|
|
|
static void
|
|
dasd_end_request_cb(struct dasd_ccw_req * cqr, void *data)
|
|
{
|
|
struct request *req;
|
|
struct dasd_device *device;
|
|
int status;
|
|
|
|
req = (struct request *) data;
|
|
device = cqr->device;
|
|
dasd_profile_end(device, cqr, req);
|
|
status = cqr->device->discipline->free_cp(cqr,req);
|
|
spin_lock_irq(&device->request_queue_lock);
|
|
dasd_end_request(req, status);
|
|
spin_unlock_irq(&device->request_queue_lock);
|
|
}
|
|
|
|
|
|
/*
|
|
* Fetch requests from the block device queue.
|
|
*/
|
|
static void
|
|
__dasd_process_blk_queue(struct dasd_device * device)
|
|
{
|
|
request_queue_t *queue;
|
|
struct request *req;
|
|
struct dasd_ccw_req *cqr;
|
|
int nr_queued;
|
|
|
|
queue = device->request_queue;
|
|
/* No queue ? Then there is nothing to do. */
|
|
if (queue == NULL)
|
|
return;
|
|
|
|
/*
|
|
* We requeue request from the block device queue to the ccw
|
|
* queue only in two states. In state DASD_STATE_READY the
|
|
* partition detection is done and we need to requeue requests
|
|
* for that. State DASD_STATE_ONLINE is normal block device
|
|
* operation.
|
|
*/
|
|
if (device->state != DASD_STATE_READY &&
|
|
device->state != DASD_STATE_ONLINE)
|
|
return;
|
|
nr_queued = 0;
|
|
/* Now we try to fetch requests from the request queue */
|
|
list_for_each_entry(cqr, &device->ccw_queue, list)
|
|
if (cqr->status == DASD_CQR_QUEUED)
|
|
nr_queued++;
|
|
while (!blk_queue_plugged(queue) &&
|
|
elv_next_request(queue) &&
|
|
nr_queued < DASD_CHANQ_MAX_SIZE) {
|
|
req = elv_next_request(queue);
|
|
|
|
if (device->features & DASD_FEATURE_READONLY &&
|
|
rq_data_dir(req) == WRITE) {
|
|
DBF_DEV_EVENT(DBF_ERR, device,
|
|
"Rejecting write request %p",
|
|
req);
|
|
blkdev_dequeue_request(req);
|
|
dasd_end_request(req, 0);
|
|
continue;
|
|
}
|
|
if (device->stopped & DASD_STOPPED_DC_EIO) {
|
|
blkdev_dequeue_request(req);
|
|
dasd_end_request(req, 0);
|
|
continue;
|
|
}
|
|
cqr = device->discipline->build_cp(device, req);
|
|
if (IS_ERR(cqr)) {
|
|
if (PTR_ERR(cqr) == -ENOMEM)
|
|
break; /* terminate request queue loop */
|
|
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(&device->ccw_queue))
|
|
break;
|
|
device->stopped |= DASD_STOPPED_PENDING;
|
|
dasd_set_timer(device, HZ/2);
|
|
break;
|
|
}
|
|
DBF_DEV_EVENT(DBF_ERR, device,
|
|
"CCW creation failed (rc=%ld) "
|
|
"on request %p",
|
|
PTR_ERR(cqr), req);
|
|
blkdev_dequeue_request(req);
|
|
dasd_end_request(req, 0);
|
|
continue;
|
|
}
|
|
cqr->callback = dasd_end_request_cb;
|
|
cqr->callback_data = (void *) req;
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
blkdev_dequeue_request(req);
|
|
list_add_tail(&cqr->list, &device->ccw_queue);
|
|
dasd_profile_start(device, cqr, req);
|
|
nr_queued++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Take a look at the first request on the ccw queue and check
|
|
* if it reached its expire time. If so, terminate the IO.
|
|
*/
|
|
static void
|
|
__dasd_check_expire(struct dasd_device * device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
if (list_empty(&device->ccw_queue))
|
|
return;
|
|
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
|
|
if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
|
|
(time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
|
|
if (device->discipline->term_IO(cqr) != 0) {
|
|
/* Hmpf, try again in 5 sec */
|
|
dasd_set_timer(device, 5*HZ);
|
|
DEV_MESSAGE(KERN_ERR, device,
|
|
"internal error - timeout (%is) expired "
|
|
"for cqr %p, termination failed, "
|
|
"retrying in 5s",
|
|
(cqr->expires/HZ), cqr);
|
|
} else {
|
|
DEV_MESSAGE(KERN_ERR, device,
|
|
"internal error - timeout (%is) expired "
|
|
"for cqr %p (%i retries left)",
|
|
(cqr->expires/HZ), cqr, cqr->retries);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Take a look at the first request on the ccw queue and check
|
|
* if it needs to be started.
|
|
*/
|
|
static void
|
|
__dasd_start_head(struct dasd_device * device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
int rc;
|
|
|
|
if (list_empty(&device->ccw_queue))
|
|
return;
|
|
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
|
|
if (cqr->status != DASD_CQR_QUEUED)
|
|
return;
|
|
/* Non-temporary stop condition will trigger fail fast */
|
|
if (device->stopped & ~DASD_STOPPED_PENDING &&
|
|
test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
|
|
(!dasd_eer_enabled(device))) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
dasd_schedule_bh(device);
|
|
return;
|
|
}
|
|
/* Don't try to start requests if device is stopped */
|
|
if (device->stopped)
|
|
return;
|
|
|
|
rc = device->discipline->start_IO(cqr);
|
|
if (rc == 0)
|
|
dasd_set_timer(device, cqr->expires);
|
|
else if (rc == -EACCES) {
|
|
dasd_schedule_bh(device);
|
|
} else
|
|
/* Hmpf, try again in 1/2 sec */
|
|
dasd_set_timer(device, 50);
|
|
}
|
|
|
|
static inline int
|
|
_wait_for_clear(struct dasd_ccw_req *cqr)
|
|
{
|
|
return (cqr->status == DASD_CQR_QUEUED);
|
|
}
|
|
|
|
/*
|
|
* Remove all requests from the ccw queue (all = '1') or only block device
|
|
* requests in case all = '0'.
|
|
* Take care of the erp-chain (chained via cqr->refers) and remove either
|
|
* the whole erp-chain or none of the erp-requests.
|
|
* If a request is currently running, term_IO is called and the request
|
|
* is re-queued. Prior to removing the terminated request we need to wait
|
|
* for the clear-interrupt.
|
|
* In case termination is not possible we stop processing and just finishing
|
|
* the already moved requests.
|
|
*/
|
|
static int
|
|
dasd_flush_ccw_queue(struct dasd_device * device, int all)
|
|
{
|
|
struct dasd_ccw_req *cqr, *orig, *n;
|
|
int rc, i;
|
|
|
|
struct list_head flush_queue;
|
|
|
|
INIT_LIST_HEAD(&flush_queue);
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
rc = 0;
|
|
restart:
|
|
list_for_each_entry_safe(cqr, n, &device->ccw_queue, list) {
|
|
/* get original request of erp request-chain */
|
|
for (orig = cqr; orig->refers != NULL; orig = orig->refers);
|
|
|
|
/* Flush all request or only block device requests? */
|
|
if (all == 0 && cqr->callback != dasd_end_request_cb &&
|
|
orig->callback != dasd_end_request_cb) {
|
|
continue;
|
|
}
|
|
/* Check status and move request to flush_queue */
|
|
switch (cqr->status) {
|
|
case DASD_CQR_IN_IO:
|
|
rc = device->discipline->term_IO(cqr);
|
|
if (rc) {
|
|
/* unable to terminate requeust */
|
|
DEV_MESSAGE(KERN_ERR, device,
|
|
"dasd flush ccw_queue is unable "
|
|
" to terminate request %p",
|
|
cqr);
|
|
/* stop flush processing */
|
|
goto finished;
|
|
}
|
|
break;
|
|
case DASD_CQR_QUEUED:
|
|
case DASD_CQR_ERROR:
|
|
/* set request to FAILED */
|
|
cqr->stopclk = get_clock();
|
|
cqr->status = DASD_CQR_FAILED;
|
|
break;
|
|
default: /* do not touch the others */
|
|
break;
|
|
}
|
|
/* Rechain request (including erp chain) */
|
|
for (i = 0; cqr != NULL; cqr = cqr->refers, i++) {
|
|
cqr->endclk = get_clock();
|
|
list_move_tail(&cqr->list, &flush_queue);
|
|
}
|
|
if (i > 1)
|
|
/* moved more than one request - need to restart */
|
|
goto restart;
|
|
}
|
|
|
|
finished:
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
/* Now call the callback function of flushed requests */
|
|
restart_cb:
|
|
list_for_each_entry_safe(cqr, n, &flush_queue, list) {
|
|
if (cqr->status == DASD_CQR_CLEAR) {
|
|
/* wait for clear interrupt! */
|
|
wait_event(dasd_flush_wq, _wait_for_clear(cqr));
|
|
cqr->status = DASD_CQR_FAILED;
|
|
}
|
|
/* Process finished ERP request. */
|
|
if (cqr->refers) {
|
|
__dasd_process_erp(device, cqr);
|
|
/* restart list_for_xx loop since dasd_process_erp
|
|
* might remove multiple elements */
|
|
goto restart_cb;
|
|
}
|
|
/* call the callback function */
|
|
cqr->endclk = get_clock();
|
|
if (cqr->callback != NULL)
|
|
(cqr->callback)(cqr, cqr->callback_data);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Acquire the device lock and process queues for the device.
|
|
*/
|
|
static void
|
|
dasd_tasklet(struct dasd_device * device)
|
|
{
|
|
struct list_head final_queue;
|
|
struct list_head *l, *n;
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
atomic_set (&device->tasklet_scheduled, 0);
|
|
INIT_LIST_HEAD(&final_queue);
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
/* Check expire time of first request on the ccw queue. */
|
|
__dasd_check_expire(device);
|
|
/* Finish off requests on ccw queue */
|
|
__dasd_process_ccw_queue(device, &final_queue);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
/* Now call the callback function of requests with final status */
|
|
list_for_each_safe(l, n, &final_queue) {
|
|
cqr = list_entry(l, struct dasd_ccw_req, list);
|
|
list_del_init(&cqr->list);
|
|
if (cqr->callback != NULL)
|
|
(cqr->callback)(cqr, cqr->callback_data);
|
|
}
|
|
spin_lock_irq(&device->request_queue_lock);
|
|
spin_lock(get_ccwdev_lock(device->cdev));
|
|
/* Get new request from the block device request queue */
|
|
__dasd_process_blk_queue(device);
|
|
/* Now check if the head of the ccw queue needs to be started. */
|
|
__dasd_start_head(device);
|
|
spin_unlock(get_ccwdev_lock(device->cdev));
|
|
spin_unlock_irq(&device->request_queue_lock);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
/*
|
|
* Schedules a call to dasd_tasklet over the device tasklet.
|
|
*/
|
|
void
|
|
dasd_schedule_bh(struct dasd_device * device)
|
|
{
|
|
/* Protect against rescheduling. */
|
|
if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
|
|
return;
|
|
dasd_get_device(device);
|
|
tasklet_hi_schedule(&device->tasklet);
|
|
}
|
|
|
|
/*
|
|
* Queue a request to the head of the ccw_queue. Start the I/O if
|
|
* possible.
|
|
*/
|
|
void
|
|
dasd_add_request_head(struct dasd_ccw_req *req)
|
|
{
|
|
struct dasd_device *device;
|
|
unsigned long flags;
|
|
|
|
device = req->device;
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
|
req->status = DASD_CQR_QUEUED;
|
|
req->device = device;
|
|
list_add(&req->list, &device->ccw_queue);
|
|
/* let the bh start the request to keep them in order */
|
|
dasd_schedule_bh(device);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
}
|
|
|
|
/*
|
|
* Queue a request to the tail of the ccw_queue. Start the I/O if
|
|
* possible.
|
|
*/
|
|
void
|
|
dasd_add_request_tail(struct dasd_ccw_req *req)
|
|
{
|
|
struct dasd_device *device;
|
|
unsigned long flags;
|
|
|
|
device = req->device;
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
|
req->status = DASD_CQR_QUEUED;
|
|
req->device = device;
|
|
list_add_tail(&req->list, &device->ccw_queue);
|
|
/* let the bh start the request to keep them in order */
|
|
dasd_schedule_bh(device);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
}
|
|
|
|
/*
|
|
* Wakeup callback.
|
|
*/
|
|
static void
|
|
dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
|
|
{
|
|
wake_up((wait_queue_head_t *) data);
|
|
}
|
|
|
|
static inline int
|
|
_wait_for_wakeup(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
int rc;
|
|
|
|
device = cqr->device;
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
rc = ((cqr->status == DASD_CQR_DONE ||
|
|
cqr->status == DASD_CQR_FAILED) &&
|
|
list_empty(&cqr->list));
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Attempts to start a special ccw queue and waits for its completion.
|
|
*/
|
|
int
|
|
dasd_sleep_on(struct dasd_ccw_req * cqr)
|
|
{
|
|
wait_queue_head_t wait_q;
|
|
struct dasd_device *device;
|
|
int rc;
|
|
|
|
device = cqr->device;
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
|
|
init_waitqueue_head (&wait_q);
|
|
cqr->callback = dasd_wakeup_cb;
|
|
cqr->callback_data = (void *) &wait_q;
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
list_add_tail(&cqr->list, &device->ccw_queue);
|
|
|
|
/* let the bh start the request to keep them in order */
|
|
dasd_schedule_bh(device);
|
|
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
|
|
wait_event(wait_q, _wait_for_wakeup(cqr));
|
|
|
|
/* Request status is either done or failed. */
|
|
rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Attempts to start a special ccw queue and wait interruptible
|
|
* for its completion.
|
|
*/
|
|
int
|
|
dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr)
|
|
{
|
|
wait_queue_head_t wait_q;
|
|
struct dasd_device *device;
|
|
int rc, finished;
|
|
|
|
device = cqr->device;
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
|
|
init_waitqueue_head (&wait_q);
|
|
cqr->callback = dasd_wakeup_cb;
|
|
cqr->callback_data = (void *) &wait_q;
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
list_add_tail(&cqr->list, &device->ccw_queue);
|
|
|
|
/* let the bh start the request to keep them in order */
|
|
dasd_schedule_bh(device);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
|
|
finished = 0;
|
|
while (!finished) {
|
|
rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr));
|
|
if (rc != -ERESTARTSYS) {
|
|
/* Request is final (done or failed) */
|
|
rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO;
|
|
break;
|
|
}
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
switch (cqr->status) {
|
|
case DASD_CQR_IN_IO:
|
|
/* terminate runnig cqr */
|
|
if (device->discipline->term_IO) {
|
|
cqr->retries = -1;
|
|
device->discipline->term_IO(cqr);
|
|
/* wait (non-interruptible) for final status
|
|
* because signal ist still pending */
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
wait_event(wait_q, _wait_for_wakeup(cqr));
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO;
|
|
finished = 1;
|
|
}
|
|
break;
|
|
case DASD_CQR_QUEUED:
|
|
/* request */
|
|
list_del_init(&cqr->list);
|
|
rc = -EIO;
|
|
finished = 1;
|
|
break;
|
|
default:
|
|
/* cqr with 'non-interruptable' status - just wait */
|
|
break;
|
|
}
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
|
|
* for eckd devices) the currently running request has to be terminated
|
|
* and be put back to status queued, before the special request is added
|
|
* to the head of the queue. Then the special request is waited on normally.
|
|
*/
|
|
static inline int
|
|
_dasd_term_running_cqr(struct dasd_device *device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
if (list_empty(&device->ccw_queue))
|
|
return 0;
|
|
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
|
|
return device->discipline->term_IO(cqr);
|
|
}
|
|
|
|
int
|
|
dasd_sleep_on_immediatly(struct dasd_ccw_req * cqr)
|
|
{
|
|
wait_queue_head_t wait_q;
|
|
struct dasd_device *device;
|
|
int rc;
|
|
|
|
device = cqr->device;
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
rc = _dasd_term_running_cqr(device);
|
|
if (rc) {
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
return rc;
|
|
}
|
|
|
|
init_waitqueue_head (&wait_q);
|
|
cqr->callback = dasd_wakeup_cb;
|
|
cqr->callback_data = (void *) &wait_q;
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
list_add(&cqr->list, &device->ccw_queue);
|
|
|
|
/* let the bh start the request to keep them in order */
|
|
dasd_schedule_bh(device);
|
|
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
|
|
wait_event(wait_q, _wait_for_wakeup(cqr));
|
|
|
|
/* Request status is either done or failed. */
|
|
rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Cancels a request that was started with dasd_sleep_on_req.
|
|
* This is useful to timeout requests. The request will be
|
|
* terminated if it is currently in i/o.
|
|
* Returns 1 if the request has been terminated.
|
|
*/
|
|
int
|
|
dasd_cancel_req(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device = cqr->device;
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
rc = 0;
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
|
switch (cqr->status) {
|
|
case DASD_CQR_QUEUED:
|
|
/* request was not started - just set to failed */
|
|
cqr->status = DASD_CQR_FAILED;
|
|
break;
|
|
case DASD_CQR_IN_IO:
|
|
/* request in IO - terminate IO and release again */
|
|
if (device->discipline->term_IO(cqr) != 0)
|
|
/* what to do if unable to terminate ??????
|
|
e.g. not _IN_IO */
|
|
cqr->status = DASD_CQR_FAILED;
|
|
cqr->stopclk = get_clock();
|
|
rc = 1;
|
|
break;
|
|
case DASD_CQR_DONE:
|
|
case DASD_CQR_FAILED:
|
|
/* already finished - do nothing */
|
|
break;
|
|
default:
|
|
DEV_MESSAGE(KERN_ALERT, device,
|
|
"invalid status %02x in request",
|
|
cqr->status);
|
|
BUG();
|
|
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
dasd_schedule_bh(device);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* SECTION: Block device operations (request queue, partitions, open, release).
|
|
*/
|
|
|
|
/*
|
|
* Dasd request queue function. Called from ll_rw_blk.c
|
|
*/
|
|
static void
|
|
do_dasd_request(request_queue_t * queue)
|
|
{
|
|
struct dasd_device *device;
|
|
|
|
device = (struct dasd_device *) queue->queuedata;
|
|
spin_lock(get_ccwdev_lock(device->cdev));
|
|
/* Get new request from the block device request queue */
|
|
__dasd_process_blk_queue(device);
|
|
/* Now check if the head of the ccw queue needs to be started. */
|
|
__dasd_start_head(device);
|
|
spin_unlock(get_ccwdev_lock(device->cdev));
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialize request queue and default I/O scheduler.
|
|
*/
|
|
static int
|
|
dasd_alloc_queue(struct dasd_device * device)
|
|
{
|
|
int rc;
|
|
|
|
device->request_queue = blk_init_queue(do_dasd_request,
|
|
&device->request_queue_lock);
|
|
if (device->request_queue == NULL)
|
|
return -ENOMEM;
|
|
|
|
device->request_queue->queuedata = device;
|
|
|
|
elevator_exit(device->request_queue->elevator);
|
|
rc = elevator_init(device->request_queue, "deadline");
|
|
if (rc) {
|
|
blk_cleanup_queue(device->request_queue);
|
|
return rc;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialize request queue.
|
|
*/
|
|
static void
|
|
dasd_setup_queue(struct dasd_device * device)
|
|
{
|
|
int max;
|
|
|
|
blk_queue_hardsect_size(device->request_queue, device->bp_block);
|
|
max = device->discipline->max_blocks << device->s2b_shift;
|
|
blk_queue_max_sectors(device->request_queue, max);
|
|
blk_queue_max_phys_segments(device->request_queue, -1L);
|
|
blk_queue_max_hw_segments(device->request_queue, -1L);
|
|
blk_queue_max_segment_size(device->request_queue, -1L);
|
|
blk_queue_segment_boundary(device->request_queue, -1L);
|
|
blk_queue_ordered(device->request_queue, QUEUE_ORDERED_TAG, NULL);
|
|
}
|
|
|
|
/*
|
|
* Deactivate and free request queue.
|
|
*/
|
|
static void
|
|
dasd_free_queue(struct dasd_device * device)
|
|
{
|
|
if (device->request_queue) {
|
|
blk_cleanup_queue(device->request_queue);
|
|
device->request_queue = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Flush request on the request queue.
|
|
*/
|
|
static void
|
|
dasd_flush_request_queue(struct dasd_device * device)
|
|
{
|
|
struct request *req;
|
|
|
|
if (!device->request_queue)
|
|
return;
|
|
|
|
spin_lock_irq(&device->request_queue_lock);
|
|
while ((req = elv_next_request(device->request_queue))) {
|
|
blkdev_dequeue_request(req);
|
|
dasd_end_request(req, 0);
|
|
}
|
|
spin_unlock_irq(&device->request_queue_lock);
|
|
}
|
|
|
|
static int
|
|
dasd_open(struct inode *inp, struct file *filp)
|
|
{
|
|
struct gendisk *disk = inp->i_bdev->bd_disk;
|
|
struct dasd_device *device = disk->private_data;
|
|
int rc;
|
|
|
|
atomic_inc(&device->open_count);
|
|
if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
|
|
rc = -ENODEV;
|
|
goto unlock;
|
|
}
|
|
|
|
if (!try_module_get(device->discipline->owner)) {
|
|
rc = -EINVAL;
|
|
goto unlock;
|
|
}
|
|
|
|
if (dasd_probeonly) {
|
|
DEV_MESSAGE(KERN_INFO, device, "%s",
|
|
"No access to device due to probeonly mode");
|
|
rc = -EPERM;
|
|
goto out;
|
|
}
|
|
|
|
if (device->state <= DASD_STATE_BASIC) {
|
|
DBF_DEV_EVENT(DBF_ERR, device, " %s",
|
|
" Cannot open unrecognized device");
|
|
rc = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out:
|
|
module_put(device->discipline->owner);
|
|
unlock:
|
|
atomic_dec(&device->open_count);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
dasd_release(struct inode *inp, struct file *filp)
|
|
{
|
|
struct gendisk *disk = inp->i_bdev->bd_disk;
|
|
struct dasd_device *device = disk->private_data;
|
|
|
|
atomic_dec(&device->open_count);
|
|
module_put(device->discipline->owner);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return disk geometry.
|
|
*/
|
|
static int
|
|
dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
|
|
{
|
|
struct dasd_device *device;
|
|
|
|
device = bdev->bd_disk->private_data;
|
|
if (!device)
|
|
return -ENODEV;
|
|
|
|
if (!device->discipline ||
|
|
!device->discipline->fill_geometry)
|
|
return -EINVAL;
|
|
|
|
device->discipline->fill_geometry(device, geo);
|
|
geo->start = get_start_sect(bdev) >> device->s2b_shift;
|
|
return 0;
|
|
}
|
|
|
|
struct block_device_operations
|
|
dasd_device_operations = {
|
|
.owner = THIS_MODULE,
|
|
.open = dasd_open,
|
|
.release = dasd_release,
|
|
.ioctl = dasd_ioctl,
|
|
.compat_ioctl = dasd_compat_ioctl,
|
|
.getgeo = dasd_getgeo,
|
|
};
|
|
|
|
|
|
static void
|
|
dasd_exit(void)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
dasd_proc_exit();
|
|
#endif
|
|
dasd_eer_exit();
|
|
if (dasd_page_cache != NULL) {
|
|
kmem_cache_destroy(dasd_page_cache);
|
|
dasd_page_cache = NULL;
|
|
}
|
|
dasd_gendisk_exit();
|
|
dasd_devmap_exit();
|
|
if (dasd_debug_area != NULL) {
|
|
debug_unregister(dasd_debug_area);
|
|
dasd_debug_area = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* SECTION: common functions for ccw_driver use
|
|
*/
|
|
|
|
/*
|
|
* Initial attempt at a probe function. this can be simplified once
|
|
* the other detection code is gone.
|
|
*/
|
|
int
|
|
dasd_generic_probe (struct ccw_device *cdev,
|
|
struct dasd_discipline *discipline)
|
|
{
|
|
int ret;
|
|
|
|
ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
|
|
if (ret) {
|
|
printk(KERN_WARNING
|
|
"dasd_generic_probe: could not set ccw-device options "
|
|
"for %s\n", cdev->dev.bus_id);
|
|
return ret;
|
|
}
|
|
ret = dasd_add_sysfs_files(cdev);
|
|
if (ret) {
|
|
printk(KERN_WARNING
|
|
"dasd_generic_probe: could not add sysfs entries "
|
|
"for %s\n", cdev->dev.bus_id);
|
|
return ret;
|
|
}
|
|
cdev->handler = &dasd_int_handler;
|
|
|
|
/*
|
|
* Automatically online either all dasd devices (dasd_autodetect)
|
|
* or all devices specified with dasd= parameters during
|
|
* initial probe.
|
|
*/
|
|
if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
|
|
(dasd_autodetect && dasd_busid_known(cdev->dev.bus_id) != 0))
|
|
ret = ccw_device_set_online(cdev);
|
|
if (ret)
|
|
printk(KERN_WARNING
|
|
"dasd_generic_probe: could not initially online "
|
|
"ccw-device %s\n", cdev->dev.bus_id);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This will one day be called from a global not_oper handler.
|
|
* It is also used by driver_unregister during module unload.
|
|
*/
|
|
void
|
|
dasd_generic_remove (struct ccw_device *cdev)
|
|
{
|
|
struct dasd_device *device;
|
|
|
|
cdev->handler = NULL;
|
|
|
|
dasd_remove_sysfs_files(cdev);
|
|
device = dasd_device_from_cdev(cdev);
|
|
if (IS_ERR(device))
|
|
return;
|
|
if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
|
|
/* Already doing offline processing */
|
|
dasd_put_device(device);
|
|
return;
|
|
}
|
|
/*
|
|
* This device is removed unconditionally. Set offline
|
|
* flag to prevent dasd_open from opening it while it is
|
|
* no quite down yet.
|
|
*/
|
|
dasd_set_target_state(device, DASD_STATE_NEW);
|
|
/* dasd_delete_device destroys the device reference. */
|
|
dasd_delete_device(device);
|
|
}
|
|
|
|
/*
|
|
* Activate a device. This is called from dasd_{eckd,fba}_probe() when either
|
|
* the device is detected for the first time and is supposed to be used
|
|
* or the user has started activation through sysfs.
|
|
*/
|
|
int
|
|
dasd_generic_set_online (struct ccw_device *cdev,
|
|
struct dasd_discipline *base_discipline)
|
|
|
|
{
|
|
struct dasd_discipline *discipline;
|
|
struct dasd_device *device;
|
|
int rc;
|
|
|
|
/* first online clears initial online feature flag */
|
|
dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
|
|
device = dasd_create_device(cdev);
|
|
if (IS_ERR(device))
|
|
return PTR_ERR(device);
|
|
|
|
discipline = base_discipline;
|
|
if (device->features & DASD_FEATURE_USEDIAG) {
|
|
if (!dasd_diag_discipline_pointer) {
|
|
printk (KERN_WARNING
|
|
"dasd_generic couldn't online device %s "
|
|
"- discipline DIAG not available\n",
|
|
cdev->dev.bus_id);
|
|
dasd_delete_device(device);
|
|
return -ENODEV;
|
|
}
|
|
discipline = dasd_diag_discipline_pointer;
|
|
}
|
|
if (!try_module_get(base_discipline->owner)) {
|
|
dasd_delete_device(device);
|
|
return -EINVAL;
|
|
}
|
|
if (!try_module_get(discipline->owner)) {
|
|
module_put(base_discipline->owner);
|
|
dasd_delete_device(device);
|
|
return -EINVAL;
|
|
}
|
|
device->base_discipline = base_discipline;
|
|
device->discipline = discipline;
|
|
|
|
rc = discipline->check_device(device);
|
|
if (rc) {
|
|
printk (KERN_WARNING
|
|
"dasd_generic couldn't online device %s "
|
|
"with discipline %s rc=%i\n",
|
|
cdev->dev.bus_id, discipline->name, rc);
|
|
module_put(discipline->owner);
|
|
module_put(base_discipline->owner);
|
|
dasd_delete_device(device);
|
|
return rc;
|
|
}
|
|
|
|
dasd_set_target_state(device, DASD_STATE_ONLINE);
|
|
if (device->state <= DASD_STATE_KNOWN) {
|
|
printk (KERN_WARNING
|
|
"dasd_generic discipline not found for %s\n",
|
|
cdev->dev.bus_id);
|
|
rc = -ENODEV;
|
|
dasd_set_target_state(device, DASD_STATE_NEW);
|
|
dasd_delete_device(device);
|
|
} else
|
|
pr_debug("dasd_generic device %s found\n",
|
|
cdev->dev.bus_id);
|
|
|
|
/* FIXME: we have to wait for the root device but we don't want
|
|
* to wait for each single device but for all at once. */
|
|
wait_event(dasd_init_waitq, _wait_for_device(device));
|
|
|
|
dasd_put_device(device);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
dasd_generic_set_offline (struct ccw_device *cdev)
|
|
{
|
|
struct dasd_device *device;
|
|
int max_count, open_count;
|
|
|
|
device = dasd_device_from_cdev(cdev);
|
|
if (IS_ERR(device))
|
|
return PTR_ERR(device);
|
|
if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
|
|
/* Already doing offline processing */
|
|
dasd_put_device(device);
|
|
return 0;
|
|
}
|
|
/*
|
|
* We must make sure that this device is currently not in use.
|
|
* The open_count is increased for every opener, that includes
|
|
* the blkdev_get in dasd_scan_partitions. We are only interested
|
|
* in the other openers.
|
|
*/
|
|
max_count = device->bdev ? 0 : -1;
|
|
open_count = (int) atomic_read(&device->open_count);
|
|
if (open_count > max_count) {
|
|
if (open_count > 0)
|
|
printk (KERN_WARNING "Can't offline dasd device with "
|
|
"open count = %i.\n",
|
|
open_count);
|
|
else
|
|
printk (KERN_WARNING "%s",
|
|
"Can't offline dasd device due to internal "
|
|
"use\n");
|
|
clear_bit(DASD_FLAG_OFFLINE, &device->flags);
|
|
dasd_put_device(device);
|
|
return -EBUSY;
|
|
}
|
|
dasd_set_target_state(device, DASD_STATE_NEW);
|
|
/* dasd_delete_device destroys the device reference. */
|
|
dasd_delete_device(device);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
dasd_generic_notify(struct ccw_device *cdev, int event)
|
|
{
|
|
struct dasd_device *device;
|
|
struct dasd_ccw_req *cqr;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
device = dasd_device_from_cdev(cdev);
|
|
if (IS_ERR(device))
|
|
return 0;
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
ret = 0;
|
|
switch (event) {
|
|
case CIO_GONE:
|
|
case CIO_NO_PATH:
|
|
/* First of all call extended error reporting. */
|
|
dasd_eer_write(device, NULL, DASD_EER_NOPATH);
|
|
|
|
if (device->state < DASD_STATE_BASIC)
|
|
break;
|
|
/* Device is active. We want to keep it. */
|
|
if (test_bit(DASD_FLAG_DSC_ERROR, &device->flags)) {
|
|
list_for_each_entry(cqr, &device->ccw_queue, list)
|
|
if (cqr->status == DASD_CQR_IN_IO)
|
|
cqr->status = DASD_CQR_FAILED;
|
|
device->stopped |= DASD_STOPPED_DC_EIO;
|
|
} else {
|
|
list_for_each_entry(cqr, &device->ccw_queue, list)
|
|
if (cqr->status == DASD_CQR_IN_IO) {
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
cqr->retries++;
|
|
}
|
|
device->stopped |= DASD_STOPPED_DC_WAIT;
|
|
dasd_set_timer(device, 0);
|
|
}
|
|
dasd_schedule_bh(device);
|
|
ret = 1;
|
|
break;
|
|
case CIO_OPER:
|
|
/* FIXME: add a sanity check. */
|
|
device->stopped &= ~(DASD_STOPPED_DC_WAIT|DASD_STOPPED_DC_EIO);
|
|
dasd_schedule_bh(device);
|
|
ret = 1;
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
dasd_put_device(device);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int __init
|
|
dasd_init(void)
|
|
{
|
|
int rc;
|
|
|
|
init_waitqueue_head(&dasd_init_waitq);
|
|
init_waitqueue_head(&dasd_flush_wq);
|
|
|
|
/* register 'common' DASD debug area, used for all DBF_XXX calls */
|
|
dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof (long));
|
|
if (dasd_debug_area == NULL) {
|
|
rc = -ENOMEM;
|
|
goto failed;
|
|
}
|
|
debug_register_view(dasd_debug_area, &debug_sprintf_view);
|
|
debug_set_level(dasd_debug_area, DBF_WARNING);
|
|
|
|
DBF_EVENT(DBF_EMERG, "%s", "debug area created");
|
|
|
|
dasd_diag_discipline_pointer = NULL;
|
|
|
|
rc = dasd_devmap_init();
|
|
if (rc)
|
|
goto failed;
|
|
rc = dasd_gendisk_init();
|
|
if (rc)
|
|
goto failed;
|
|
rc = dasd_parse();
|
|
if (rc)
|
|
goto failed;
|
|
rc = dasd_eer_init();
|
|
if (rc)
|
|
goto failed;
|
|
#ifdef CONFIG_PROC_FS
|
|
rc = dasd_proc_init();
|
|
if (rc)
|
|
goto failed;
|
|
#endif
|
|
|
|
return 0;
|
|
failed:
|
|
MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors");
|
|
dasd_exit();
|
|
return rc;
|
|
}
|
|
|
|
module_init(dasd_init);
|
|
module_exit(dasd_exit);
|
|
|
|
EXPORT_SYMBOL(dasd_debug_area);
|
|
EXPORT_SYMBOL(dasd_diag_discipline_pointer);
|
|
|
|
EXPORT_SYMBOL(dasd_add_request_head);
|
|
EXPORT_SYMBOL(dasd_add_request_tail);
|
|
EXPORT_SYMBOL(dasd_cancel_req);
|
|
EXPORT_SYMBOL(dasd_clear_timer);
|
|
EXPORT_SYMBOL(dasd_enable_device);
|
|
EXPORT_SYMBOL(dasd_int_handler);
|
|
EXPORT_SYMBOL(dasd_kfree_request);
|
|
EXPORT_SYMBOL(dasd_kick_device);
|
|
EXPORT_SYMBOL(dasd_kmalloc_request);
|
|
EXPORT_SYMBOL(dasd_schedule_bh);
|
|
EXPORT_SYMBOL(dasd_set_target_state);
|
|
EXPORT_SYMBOL(dasd_set_timer);
|
|
EXPORT_SYMBOL(dasd_sfree_request);
|
|
EXPORT_SYMBOL(dasd_sleep_on);
|
|
EXPORT_SYMBOL(dasd_sleep_on_immediatly);
|
|
EXPORT_SYMBOL(dasd_sleep_on_interruptible);
|
|
EXPORT_SYMBOL(dasd_smalloc_request);
|
|
EXPORT_SYMBOL(dasd_start_IO);
|
|
EXPORT_SYMBOL(dasd_term_IO);
|
|
|
|
EXPORT_SYMBOL_GPL(dasd_generic_probe);
|
|
EXPORT_SYMBOL_GPL(dasd_generic_remove);
|
|
EXPORT_SYMBOL_GPL(dasd_generic_notify);
|
|
EXPORT_SYMBOL_GPL(dasd_generic_set_online);
|
|
EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
|
|
|