mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Yangtao Li](/assets/img/avatar_default.png)
Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code. Signed-off-by: Yangtao Li <tiny.windzz@gmail.com> Signed-off-by: Sebastian Ott <sebott@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
4128 lines
110 KiB
C
4128 lines
110 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
|
|
* Horst Hummel <Horst.Hummel@de.ibm.com>
|
|
* Carsten Otte <Cotte@de.ibm.com>
|
|
* Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
* Bugreports.to..: <Linux390@de.ibm.com>
|
|
* Copyright IBM Corp. 1999, 2009
|
|
*/
|
|
|
|
#define KMSG_COMPONENT "dasd"
|
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
|
|
#include <linux/kmod.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/major.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/hdreg.h>
|
|
#include <linux/async.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include <asm/ccwdev.h>
|
|
#include <asm/ebcdic.h>
|
|
#include <asm/idals.h>
|
|
#include <asm/itcw.h>
|
|
#include <asm/diag.h>
|
|
|
|
/* This is ugly... */
|
|
#define PRINTK_HEADER "dasd:"
|
|
|
|
#include "dasd_int.h"
|
|
/*
|
|
* SECTION: Constant definitions to be used within this file
|
|
*/
|
|
#define DASD_CHANQ_MAX_SIZE 4
|
|
|
|
#define DASD_DIAG_MOD "dasd_diag_mod"
|
|
|
|
static unsigned int queue_depth = 32;
|
|
static unsigned int nr_hw_queues = 4;
|
|
|
|
module_param(queue_depth, uint, 0444);
|
|
MODULE_PARM_DESC(queue_depth, "Default queue depth for new DASD devices");
|
|
|
|
module_param(nr_hw_queues, uint, 0444);
|
|
MODULE_PARM_DESC(nr_hw_queues, "Default number of hardware queues for new DASD devices");
|
|
|
|
/*
|
|
* SECTION: exported variables of dasd.c
|
|
*/
|
|
debug_info_t *dasd_debug_area;
|
|
EXPORT_SYMBOL(dasd_debug_area);
|
|
static struct dentry *dasd_debugfs_root_entry;
|
|
struct dasd_discipline *dasd_diag_discipline_pointer;
|
|
EXPORT_SYMBOL(dasd_diag_discipline_pointer);
|
|
void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
|
|
|
|
MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
|
|
MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
|
|
" Copyright IBM Corp. 2000");
|
|
MODULE_SUPPORTED_DEVICE("dasd");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/*
|
|
* SECTION: prototypes for static functions of dasd.c
|
|
*/
|
|
static int dasd_alloc_queue(struct dasd_block *);
|
|
static void dasd_setup_queue(struct dasd_block *);
|
|
static void dasd_free_queue(struct dasd_block *);
|
|
static int dasd_flush_block_queue(struct dasd_block *);
|
|
static void dasd_device_tasklet(unsigned long);
|
|
static void dasd_block_tasklet(unsigned long);
|
|
static void do_kick_device(struct work_struct *);
|
|
static void do_restore_device(struct work_struct *);
|
|
static void do_reload_device(struct work_struct *);
|
|
static void do_requeue_requests(struct work_struct *);
|
|
static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
|
|
static void dasd_device_timeout(struct timer_list *);
|
|
static void dasd_block_timeout(struct timer_list *);
|
|
static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
|
|
static void dasd_profile_init(struct dasd_profile *, struct dentry *);
|
|
static void dasd_profile_exit(struct dasd_profile *);
|
|
static void dasd_hosts_init(struct dentry *, struct dasd_device *);
|
|
static void dasd_hosts_exit(struct dasd_device *);
|
|
|
|
/*
|
|
* SECTION: Operations on the device structure.
|
|
*/
|
|
static wait_queue_head_t dasd_init_waitq;
|
|
static wait_queue_head_t dasd_flush_wq;
|
|
static wait_queue_head_t generic_waitq;
|
|
static wait_queue_head_t shutdown_waitq;
|
|
|
|
/*
|
|
* Allocate memory for a new device structure.
|
|
*/
|
|
struct dasd_device *dasd_alloc_device(void)
|
|
{
|
|
struct dasd_device *device;
|
|
|
|
device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
|
|
if (!device)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* Get two pages for normal block device operations. */
|
|
device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
|
|
if (!device->ccw_mem) {
|
|
kfree(device);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
/* Get one page for error recovery. */
|
|
device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
|
|
if (!device->erp_mem) {
|
|
free_pages((unsigned long) device->ccw_mem, 1);
|
|
kfree(device);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
|
|
dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
|
|
spin_lock_init(&device->mem_lock);
|
|
atomic_set(&device->tasklet_scheduled, 0);
|
|
tasklet_init(&device->tasklet, dasd_device_tasklet,
|
|
(unsigned long) device);
|
|
INIT_LIST_HEAD(&device->ccw_queue);
|
|
timer_setup(&device->timer, dasd_device_timeout, 0);
|
|
INIT_WORK(&device->kick_work, do_kick_device);
|
|
INIT_WORK(&device->restore_device, do_restore_device);
|
|
INIT_WORK(&device->reload_device, do_reload_device);
|
|
INIT_WORK(&device->requeue_requests, do_requeue_requests);
|
|
device->state = DASD_STATE_NEW;
|
|
device->target = DASD_STATE_NEW;
|
|
mutex_init(&device->state_mutex);
|
|
spin_lock_init(&device->profile.lock);
|
|
return device;
|
|
}
|
|
|
|
/*
|
|
* Free memory of a device structure.
|
|
*/
|
|
void dasd_free_device(struct dasd_device *device)
|
|
{
|
|
kfree(device->private);
|
|
free_page((unsigned long) device->erp_mem);
|
|
free_pages((unsigned long) device->ccw_mem, 1);
|
|
kfree(device);
|
|
}
|
|
|
|
/*
|
|
* Allocate memory for a new device structure.
|
|
*/
|
|
struct dasd_block *dasd_alloc_block(void)
|
|
{
|
|
struct dasd_block *block;
|
|
|
|
block = kzalloc(sizeof(*block), GFP_ATOMIC);
|
|
if (!block)
|
|
return ERR_PTR(-ENOMEM);
|
|
/* open_count = 0 means device online but not in use */
|
|
atomic_set(&block->open_count, -1);
|
|
|
|
atomic_set(&block->tasklet_scheduled, 0);
|
|
tasklet_init(&block->tasklet, dasd_block_tasklet,
|
|
(unsigned long) block);
|
|
INIT_LIST_HEAD(&block->ccw_queue);
|
|
spin_lock_init(&block->queue_lock);
|
|
timer_setup(&block->timer, dasd_block_timeout, 0);
|
|
spin_lock_init(&block->profile.lock);
|
|
|
|
return block;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_alloc_block);
|
|
|
|
/*
|
|
* Free memory of a device structure.
|
|
*/
|
|
void dasd_free_block(struct dasd_block *block)
|
|
{
|
|
kfree(block);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_free_block);
|
|
|
|
/*
|
|
* Make a new device known to the system.
|
|
*/
|
|
static int dasd_state_new_to_known(struct dasd_device *device)
|
|
{
|
|
int rc;
|
|
|
|
/*
|
|
* As long as the device is not in state DASD_STATE_NEW we want to
|
|
* keep the reference count > 0.
|
|
*/
|
|
dasd_get_device(device);
|
|
|
|
if (device->block) {
|
|
rc = dasd_alloc_queue(device->block);
|
|
if (rc) {
|
|
dasd_put_device(device);
|
|
return rc;
|
|
}
|
|
}
|
|
device->state = DASD_STATE_KNOWN;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Let the system forget about a device.
|
|
*/
|
|
static int dasd_state_known_to_new(struct dasd_device *device)
|
|
{
|
|
/* Disable extended error reporting for this device. */
|
|
dasd_eer_disable(device);
|
|
device->state = DASD_STATE_NEW;
|
|
|
|
if (device->block)
|
|
dasd_free_queue(device->block);
|
|
|
|
/* Give up reference we took in dasd_state_new_to_known. */
|
|
dasd_put_device(device);
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *dasd_debugfs_setup(const char *name,
|
|
struct dentry *base_dentry)
|
|
{
|
|
struct dentry *pde;
|
|
|
|
if (!base_dentry)
|
|
return NULL;
|
|
pde = debugfs_create_dir(name, base_dentry);
|
|
if (!pde || IS_ERR(pde))
|
|
return NULL;
|
|
return pde;
|
|
}
|
|
|
|
/*
|
|
* Request the irq line for the device.
|
|
*/
|
|
static int dasd_state_known_to_basic(struct dasd_device *device)
|
|
{
|
|
struct dasd_block *block = device->block;
|
|
int rc = 0;
|
|
|
|
/* Allocate and register gendisk structure. */
|
|
if (block) {
|
|
rc = dasd_gendisk_alloc(block);
|
|
if (rc)
|
|
return rc;
|
|
block->debugfs_dentry =
|
|
dasd_debugfs_setup(block->gdp->disk_name,
|
|
dasd_debugfs_root_entry);
|
|
dasd_profile_init(&block->profile, block->debugfs_dentry);
|
|
if (dasd_global_profile_level == DASD_PROFILE_ON)
|
|
dasd_profile_on(&device->block->profile);
|
|
}
|
|
device->debugfs_dentry =
|
|
dasd_debugfs_setup(dev_name(&device->cdev->dev),
|
|
dasd_debugfs_root_entry);
|
|
dasd_profile_init(&device->profile, device->debugfs_dentry);
|
|
dasd_hosts_init(device->debugfs_dentry, device);
|
|
|
|
/* register 'device' debug area, used for all DBF_DEV_XXX calls */
|
|
device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
|
|
8 * sizeof(long));
|
|
debug_register_view(device->debug_area, &debug_sprintf_view);
|
|
debug_set_level(device->debug_area, DBF_WARNING);
|
|
DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
|
|
|
|
device->state = DASD_STATE_BASIC;
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Release the irq line for the device. Terminate any running i/o.
|
|
*/
|
|
static int dasd_state_basic_to_known(struct dasd_device *device)
|
|
{
|
|
int rc;
|
|
|
|
if (device->discipline->basic_to_known) {
|
|
rc = device->discipline->basic_to_known(device);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
if (device->block) {
|
|
dasd_profile_exit(&device->block->profile);
|
|
debugfs_remove(device->block->debugfs_dentry);
|
|
dasd_gendisk_free(device->block);
|
|
dasd_block_clear_timer(device->block);
|
|
}
|
|
rc = dasd_flush_device_queue(device);
|
|
if (rc)
|
|
return rc;
|
|
dasd_device_clear_timer(device);
|
|
dasd_profile_exit(&device->profile);
|
|
dasd_hosts_exit(device);
|
|
debugfs_remove(device->debugfs_dentry);
|
|
DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
|
|
if (device->debug_area != NULL) {
|
|
debug_unregister(device->debug_area);
|
|
device->debug_area = NULL;
|
|
}
|
|
device->state = DASD_STATE_KNOWN;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Do the initial analysis. The do_analysis function may return
|
|
* -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
|
|
* until the discipline decides to continue the startup sequence
|
|
* by calling the function dasd_change_state. The eckd disciplines
|
|
* uses this to start a ccw that detects the format. The completion
|
|
* interrupt for this detection ccw uses the kernel event daemon to
|
|
* trigger the call to dasd_change_state. All this is done in the
|
|
* discipline code, see dasd_eckd.c.
|
|
* After the analysis ccw is done (do_analysis returned 0) the block
|
|
* device is setup.
|
|
* In case the analysis returns an error, the device setup is stopped
|
|
* (a fake disk was already added to allow formatting).
|
|
*/
|
|
static int dasd_state_basic_to_ready(struct dasd_device *device)
|
|
{
|
|
int rc;
|
|
struct dasd_block *block;
|
|
struct gendisk *disk;
|
|
|
|
rc = 0;
|
|
block = device->block;
|
|
/* make disk known with correct capacity */
|
|
if (block) {
|
|
if (block->base->discipline->do_analysis != NULL)
|
|
rc = block->base->discipline->do_analysis(block);
|
|
if (rc) {
|
|
if (rc != -EAGAIN) {
|
|
device->state = DASD_STATE_UNFMT;
|
|
disk = device->block->gdp;
|
|
kobject_uevent(&disk_to_dev(disk)->kobj,
|
|
KOBJ_CHANGE);
|
|
goto out;
|
|
}
|
|
return rc;
|
|
}
|
|
dasd_setup_queue(block);
|
|
set_capacity(block->gdp,
|
|
block->blocks << block->s2b_shift);
|
|
device->state = DASD_STATE_READY;
|
|
rc = dasd_scan_partitions(block);
|
|
if (rc) {
|
|
device->state = DASD_STATE_BASIC;
|
|
return rc;
|
|
}
|
|
} else {
|
|
device->state = DASD_STATE_READY;
|
|
}
|
|
out:
|
|
if (device->discipline->basic_to_ready)
|
|
rc = device->discipline->basic_to_ready(device);
|
|
return rc;
|
|
}
|
|
|
|
static inline
|
|
int _wait_for_empty_queues(struct dasd_device *device)
|
|
{
|
|
if (device->block)
|
|
return list_empty(&device->ccw_queue) &&
|
|
list_empty(&device->block->ccw_queue);
|
|
else
|
|
return list_empty(&device->ccw_queue);
|
|
}
|
|
|
|
/*
|
|
* Remove device from block device layer. Destroy dirty buffers.
|
|
* Forget format information. Check if the target level is basic
|
|
* and if it is create fake disk for formatting.
|
|
*/
|
|
static int dasd_state_ready_to_basic(struct dasd_device *device)
|
|
{
|
|
int rc;
|
|
|
|
device->state = DASD_STATE_BASIC;
|
|
if (device->block) {
|
|
struct dasd_block *block = device->block;
|
|
rc = dasd_flush_block_queue(block);
|
|
if (rc) {
|
|
device->state = DASD_STATE_READY;
|
|
return rc;
|
|
}
|
|
dasd_destroy_partitions(block);
|
|
block->blocks = 0;
|
|
block->bp_block = 0;
|
|
block->s2b_shift = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Back to basic.
|
|
*/
|
|
static int dasd_state_unfmt_to_basic(struct dasd_device *device)
|
|
{
|
|
device->state = DASD_STATE_BASIC;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Make the device online and schedule the bottom half to start
|
|
* the requeueing of requests from the linux request queue to the
|
|
* ccw queue.
|
|
*/
|
|
static int
|
|
dasd_state_ready_to_online(struct dasd_device * device)
|
|
{
|
|
struct gendisk *disk;
|
|
struct disk_part_iter piter;
|
|
struct hd_struct *part;
|
|
|
|
device->state = DASD_STATE_ONLINE;
|
|
if (device->block) {
|
|
dasd_schedule_block_bh(device->block);
|
|
if ((device->features & DASD_FEATURE_USERAW)) {
|
|
disk = device->block->gdp;
|
|
kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
|
|
return 0;
|
|
}
|
|
disk = device->block->bdev->bd_disk;
|
|
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
|
|
while ((part = disk_part_iter_next(&piter)))
|
|
kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
|
|
disk_part_iter_exit(&piter);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Stop the requeueing of requests again.
|
|
*/
|
|
static int dasd_state_online_to_ready(struct dasd_device *device)
|
|
{
|
|
int rc;
|
|
struct gendisk *disk;
|
|
struct disk_part_iter piter;
|
|
struct hd_struct *part;
|
|
|
|
if (device->discipline->online_to_ready) {
|
|
rc = device->discipline->online_to_ready(device);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
device->state = DASD_STATE_READY;
|
|
if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
|
|
disk = device->block->bdev->bd_disk;
|
|
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
|
|
while ((part = disk_part_iter_next(&piter)))
|
|
kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
|
|
disk_part_iter_exit(&piter);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Device startup state changes.
|
|
*/
|
|
static int dasd_increase_state(struct dasd_device *device)
|
|
{
|
|
int rc;
|
|
|
|
rc = 0;
|
|
if (device->state == DASD_STATE_NEW &&
|
|
device->target >= DASD_STATE_KNOWN)
|
|
rc = dasd_state_new_to_known(device);
|
|
|
|
if (!rc &&
|
|
device->state == DASD_STATE_KNOWN &&
|
|
device->target >= DASD_STATE_BASIC)
|
|
rc = dasd_state_known_to_basic(device);
|
|
|
|
if (!rc &&
|
|
device->state == DASD_STATE_BASIC &&
|
|
device->target >= DASD_STATE_READY)
|
|
rc = dasd_state_basic_to_ready(device);
|
|
|
|
if (!rc &&
|
|
device->state == DASD_STATE_UNFMT &&
|
|
device->target > DASD_STATE_UNFMT)
|
|
rc = -EPERM;
|
|
|
|
if (!rc &&
|
|
device->state == DASD_STATE_READY &&
|
|
device->target >= DASD_STATE_ONLINE)
|
|
rc = dasd_state_ready_to_online(device);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Device shutdown state changes.
|
|
*/
|
|
static int dasd_decrease_state(struct dasd_device *device)
|
|
{
|
|
int rc;
|
|
|
|
rc = 0;
|
|
if (device->state == DASD_STATE_ONLINE &&
|
|
device->target <= DASD_STATE_READY)
|
|
rc = dasd_state_online_to_ready(device);
|
|
|
|
if (!rc &&
|
|
device->state == DASD_STATE_READY &&
|
|
device->target <= DASD_STATE_BASIC)
|
|
rc = dasd_state_ready_to_basic(device);
|
|
|
|
if (!rc &&
|
|
device->state == DASD_STATE_UNFMT &&
|
|
device->target <= DASD_STATE_BASIC)
|
|
rc = dasd_state_unfmt_to_basic(device);
|
|
|
|
if (!rc &&
|
|
device->state == DASD_STATE_BASIC &&
|
|
device->target <= DASD_STATE_KNOWN)
|
|
rc = dasd_state_basic_to_known(device);
|
|
|
|
if (!rc &&
|
|
device->state == DASD_STATE_KNOWN &&
|
|
device->target <= DASD_STATE_NEW)
|
|
rc = dasd_state_known_to_new(device);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* This is the main startup/shutdown routine.
|
|
*/
|
|
static void dasd_change_state(struct dasd_device *device)
|
|
{
|
|
int rc;
|
|
|
|
if (device->state == device->target)
|
|
/* Already where we want to go today... */
|
|
return;
|
|
if (device->state < device->target)
|
|
rc = dasd_increase_state(device);
|
|
else
|
|
rc = dasd_decrease_state(device);
|
|
if (rc == -EAGAIN)
|
|
return;
|
|
if (rc)
|
|
device->target = device->state;
|
|
|
|
/* let user-space know that the device status changed */
|
|
kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
|
|
|
|
if (device->state == device->target)
|
|
wake_up(&dasd_init_waitq);
|
|
}
|
|
|
|
/*
|
|
* Kick starter for devices that did not complete the startup/shutdown
|
|
* procedure or were sleeping because of a pending state.
|
|
* dasd_kick_device will schedule a call do do_kick_device to the kernel
|
|
* event daemon.
|
|
*/
|
|
static void do_kick_device(struct work_struct *work)
|
|
{
|
|
struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
|
|
mutex_lock(&device->state_mutex);
|
|
dasd_change_state(device);
|
|
mutex_unlock(&device->state_mutex);
|
|
dasd_schedule_device_bh(device);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
void dasd_kick_device(struct dasd_device *device)
|
|
{
|
|
dasd_get_device(device);
|
|
/* queue call to dasd_kick_device to the kernel event daemon. */
|
|
if (!schedule_work(&device->kick_work))
|
|
dasd_put_device(device);
|
|
}
|
|
EXPORT_SYMBOL(dasd_kick_device);
|
|
|
|
/*
|
|
* dasd_reload_device will schedule a call do do_reload_device to the kernel
|
|
* event daemon.
|
|
*/
|
|
static void do_reload_device(struct work_struct *work)
|
|
{
|
|
struct dasd_device *device = container_of(work, struct dasd_device,
|
|
reload_device);
|
|
device->discipline->reload(device);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
void dasd_reload_device(struct dasd_device *device)
|
|
{
|
|
dasd_get_device(device);
|
|
/* queue call to dasd_reload_device to the kernel event daemon. */
|
|
if (!schedule_work(&device->reload_device))
|
|
dasd_put_device(device);
|
|
}
|
|
EXPORT_SYMBOL(dasd_reload_device);
|
|
|
|
/*
|
|
* dasd_restore_device will schedule a call do do_restore_device to the kernel
|
|
* event daemon.
|
|
*/
|
|
static void do_restore_device(struct work_struct *work)
|
|
{
|
|
struct dasd_device *device = container_of(work, struct dasd_device,
|
|
restore_device);
|
|
device->cdev->drv->restore(device->cdev);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
void dasd_restore_device(struct dasd_device *device)
|
|
{
|
|
dasd_get_device(device);
|
|
/* queue call to dasd_restore_device to the kernel event daemon. */
|
|
if (!schedule_work(&device->restore_device))
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
/*
|
|
* Set the target state for a device and starts the state change.
|
|
*/
|
|
void dasd_set_target_state(struct dasd_device *device, int target)
|
|
{
|
|
dasd_get_device(device);
|
|
mutex_lock(&device->state_mutex);
|
|
/* If we are in probeonly mode stop at DASD_STATE_READY. */
|
|
if (dasd_probeonly && target > DASD_STATE_READY)
|
|
target = DASD_STATE_READY;
|
|
if (device->target != target) {
|
|
if (device->state == target)
|
|
wake_up(&dasd_init_waitq);
|
|
device->target = target;
|
|
}
|
|
if (device->state != device->target)
|
|
dasd_change_state(device);
|
|
mutex_unlock(&device->state_mutex);
|
|
dasd_put_device(device);
|
|
}
|
|
EXPORT_SYMBOL(dasd_set_target_state);
|
|
|
|
/*
|
|
* Enable devices with device numbers in [from..to].
|
|
*/
|
|
static inline int _wait_for_device(struct dasd_device *device)
|
|
{
|
|
return (device->state == device->target);
|
|
}
|
|
|
|
void dasd_enable_device(struct dasd_device *device)
|
|
{
|
|
dasd_set_target_state(device, DASD_STATE_ONLINE);
|
|
if (device->state <= DASD_STATE_KNOWN)
|
|
/* No discipline for device found. */
|
|
dasd_set_target_state(device, DASD_STATE_NEW);
|
|
/* Now wait for the devices to come up. */
|
|
wait_event(dasd_init_waitq, _wait_for_device(device));
|
|
|
|
dasd_reload_device(device);
|
|
if (device->discipline->kick_validate)
|
|
device->discipline->kick_validate(device);
|
|
}
|
|
EXPORT_SYMBOL(dasd_enable_device);
|
|
|
|
/*
|
|
* SECTION: device operation (interrupt handler, start i/o, term i/o ...)
|
|
*/
|
|
|
|
unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
|
|
|
|
#ifdef CONFIG_DASD_PROFILE
|
|
struct dasd_profile dasd_global_profile = {
|
|
.lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock),
|
|
};
|
|
static struct dentry *dasd_debugfs_global_entry;
|
|
|
|
/*
|
|
* Add profiling information for cqr before execution.
|
|
*/
|
|
static void dasd_profile_start(struct dasd_block *block,
|
|
struct dasd_ccw_req *cqr,
|
|
struct request *req)
|
|
{
|
|
struct list_head *l;
|
|
unsigned int counter;
|
|
struct dasd_device *device;
|
|
|
|
/* count the length of the chanq for statistics */
|
|
counter = 0;
|
|
if (dasd_global_profile_level || block->profile.data)
|
|
list_for_each(l, &block->ccw_queue)
|
|
if (++counter >= 31)
|
|
break;
|
|
|
|
spin_lock(&dasd_global_profile.lock);
|
|
if (dasd_global_profile.data) {
|
|
dasd_global_profile.data->dasd_io_nr_req[counter]++;
|
|
if (rq_data_dir(req) == READ)
|
|
dasd_global_profile.data->dasd_read_nr_req[counter]++;
|
|
}
|
|
spin_unlock(&dasd_global_profile.lock);
|
|
|
|
spin_lock(&block->profile.lock);
|
|
if (block->profile.data) {
|
|
block->profile.data->dasd_io_nr_req[counter]++;
|
|
if (rq_data_dir(req) == READ)
|
|
block->profile.data->dasd_read_nr_req[counter]++;
|
|
}
|
|
spin_unlock(&block->profile.lock);
|
|
|
|
/*
|
|
* We count the request for the start device, even though it may run on
|
|
* some other device due to error recovery. This way we make sure that
|
|
* we count each request only once.
|
|
*/
|
|
device = cqr->startdev;
|
|
if (device->profile.data) {
|
|
counter = 1; /* request is not yet queued on the start device */
|
|
list_for_each(l, &device->ccw_queue)
|
|
if (++counter >= 31)
|
|
break;
|
|
}
|
|
spin_lock(&device->profile.lock);
|
|
if (device->profile.data) {
|
|
device->profile.data->dasd_io_nr_req[counter]++;
|
|
if (rq_data_dir(req) == READ)
|
|
device->profile.data->dasd_read_nr_req[counter]++;
|
|
}
|
|
spin_unlock(&device->profile.lock);
|
|
}
|
|
|
|
/*
|
|
* Add profiling information for cqr after execution.
|
|
*/
|
|
|
|
#define dasd_profile_counter(value, index) \
|
|
{ \
|
|
for (index = 0; index < 31 && value >> (2+index); index++) \
|
|
; \
|
|
}
|
|
|
|
static void dasd_profile_end_add_data(struct dasd_profile_info *data,
|
|
int is_alias,
|
|
int is_tpm,
|
|
int is_read,
|
|
long sectors,
|
|
int sectors_ind,
|
|
int tottime_ind,
|
|
int tottimeps_ind,
|
|
int strtime_ind,
|
|
int irqtime_ind,
|
|
int irqtimeps_ind,
|
|
int endtime_ind)
|
|
{
|
|
/* in case of an overflow, reset the whole profile */
|
|
if (data->dasd_io_reqs == UINT_MAX) {
|
|
memset(data, 0, sizeof(*data));
|
|
ktime_get_real_ts64(&data->starttod);
|
|
}
|
|
data->dasd_io_reqs++;
|
|
data->dasd_io_sects += sectors;
|
|
if (is_alias)
|
|
data->dasd_io_alias++;
|
|
if (is_tpm)
|
|
data->dasd_io_tpm++;
|
|
|
|
data->dasd_io_secs[sectors_ind]++;
|
|
data->dasd_io_times[tottime_ind]++;
|
|
data->dasd_io_timps[tottimeps_ind]++;
|
|
data->dasd_io_time1[strtime_ind]++;
|
|
data->dasd_io_time2[irqtime_ind]++;
|
|
data->dasd_io_time2ps[irqtimeps_ind]++;
|
|
data->dasd_io_time3[endtime_ind]++;
|
|
|
|
if (is_read) {
|
|
data->dasd_read_reqs++;
|
|
data->dasd_read_sects += sectors;
|
|
if (is_alias)
|
|
data->dasd_read_alias++;
|
|
if (is_tpm)
|
|
data->dasd_read_tpm++;
|
|
data->dasd_read_secs[sectors_ind]++;
|
|
data->dasd_read_times[tottime_ind]++;
|
|
data->dasd_read_time1[strtime_ind]++;
|
|
data->dasd_read_time2[irqtime_ind]++;
|
|
data->dasd_read_time3[endtime_ind]++;
|
|
}
|
|
}
|
|
|
|
static void dasd_profile_end(struct dasd_block *block,
|
|
struct dasd_ccw_req *cqr,
|
|
struct request *req)
|
|
{
|
|
unsigned long strtime, irqtime, endtime, tottime;
|
|
unsigned long tottimeps, sectors;
|
|
struct dasd_device *device;
|
|
int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
|
|
int irqtime_ind, irqtimeps_ind, endtime_ind;
|
|
struct dasd_profile_info *data;
|
|
|
|
device = cqr->startdev;
|
|
if (!(dasd_global_profile_level ||
|
|
block->profile.data ||
|
|
device->profile.data))
|
|
return;
|
|
|
|
sectors = blk_rq_sectors(req);
|
|
if (!cqr->buildclk || !cqr->startclk ||
|
|
!cqr->stopclk || !cqr->endclk ||
|
|
!sectors)
|
|
return;
|
|
|
|
strtime = ((cqr->startclk - cqr->buildclk) >> 12);
|
|
irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
|
|
endtime = ((cqr->endclk - cqr->stopclk) >> 12);
|
|
tottime = ((cqr->endclk - cqr->buildclk) >> 12);
|
|
tottimeps = tottime / sectors;
|
|
|
|
dasd_profile_counter(sectors, sectors_ind);
|
|
dasd_profile_counter(tottime, tottime_ind);
|
|
dasd_profile_counter(tottimeps, tottimeps_ind);
|
|
dasd_profile_counter(strtime, strtime_ind);
|
|
dasd_profile_counter(irqtime, irqtime_ind);
|
|
dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
|
|
dasd_profile_counter(endtime, endtime_ind);
|
|
|
|
spin_lock(&dasd_global_profile.lock);
|
|
if (dasd_global_profile.data) {
|
|
data = dasd_global_profile.data;
|
|
data->dasd_sum_times += tottime;
|
|
data->dasd_sum_time_str += strtime;
|
|
data->dasd_sum_time_irq += irqtime;
|
|
data->dasd_sum_time_end += endtime;
|
|
dasd_profile_end_add_data(dasd_global_profile.data,
|
|
cqr->startdev != block->base,
|
|
cqr->cpmode == 1,
|
|
rq_data_dir(req) == READ,
|
|
sectors, sectors_ind, tottime_ind,
|
|
tottimeps_ind, strtime_ind,
|
|
irqtime_ind, irqtimeps_ind,
|
|
endtime_ind);
|
|
}
|
|
spin_unlock(&dasd_global_profile.lock);
|
|
|
|
spin_lock(&block->profile.lock);
|
|
if (block->profile.data) {
|
|
data = block->profile.data;
|
|
data->dasd_sum_times += tottime;
|
|
data->dasd_sum_time_str += strtime;
|
|
data->dasd_sum_time_irq += irqtime;
|
|
data->dasd_sum_time_end += endtime;
|
|
dasd_profile_end_add_data(block->profile.data,
|
|
cqr->startdev != block->base,
|
|
cqr->cpmode == 1,
|
|
rq_data_dir(req) == READ,
|
|
sectors, sectors_ind, tottime_ind,
|
|
tottimeps_ind, strtime_ind,
|
|
irqtime_ind, irqtimeps_ind,
|
|
endtime_ind);
|
|
}
|
|
spin_unlock(&block->profile.lock);
|
|
|
|
spin_lock(&device->profile.lock);
|
|
if (device->profile.data) {
|
|
data = device->profile.data;
|
|
data->dasd_sum_times += tottime;
|
|
data->dasd_sum_time_str += strtime;
|
|
data->dasd_sum_time_irq += irqtime;
|
|
data->dasd_sum_time_end += endtime;
|
|
dasd_profile_end_add_data(device->profile.data,
|
|
cqr->startdev != block->base,
|
|
cqr->cpmode == 1,
|
|
rq_data_dir(req) == READ,
|
|
sectors, sectors_ind, tottime_ind,
|
|
tottimeps_ind, strtime_ind,
|
|
irqtime_ind, irqtimeps_ind,
|
|
endtime_ind);
|
|
}
|
|
spin_unlock(&device->profile.lock);
|
|
}
|
|
|
|
void dasd_profile_reset(struct dasd_profile *profile)
|
|
{
|
|
struct dasd_profile_info *data;
|
|
|
|
spin_lock_bh(&profile->lock);
|
|
data = profile->data;
|
|
if (!data) {
|
|
spin_unlock_bh(&profile->lock);
|
|
return;
|
|
}
|
|
memset(data, 0, sizeof(*data));
|
|
ktime_get_real_ts64(&data->starttod);
|
|
spin_unlock_bh(&profile->lock);
|
|
}
|
|
|
|
int dasd_profile_on(struct dasd_profile *profile)
|
|
{
|
|
struct dasd_profile_info *data;
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
spin_lock_bh(&profile->lock);
|
|
if (profile->data) {
|
|
spin_unlock_bh(&profile->lock);
|
|
kfree(data);
|
|
return 0;
|
|
}
|
|
ktime_get_real_ts64(&data->starttod);
|
|
profile->data = data;
|
|
spin_unlock_bh(&profile->lock);
|
|
return 0;
|
|
}
|
|
|
|
void dasd_profile_off(struct dasd_profile *profile)
|
|
{
|
|
spin_lock_bh(&profile->lock);
|
|
kfree(profile->data);
|
|
profile->data = NULL;
|
|
spin_unlock_bh(&profile->lock);
|
|
}
|
|
|
|
char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
|
|
{
|
|
char *buffer;
|
|
|
|
buffer = vmalloc(user_len + 1);
|
|
if (buffer == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (copy_from_user(buffer, user_buf, user_len) != 0) {
|
|
vfree(buffer);
|
|
return ERR_PTR(-EFAULT);
|
|
}
|
|
/* got the string, now strip linefeed. */
|
|
if (buffer[user_len - 1] == '\n')
|
|
buffer[user_len - 1] = 0;
|
|
else
|
|
buffer[user_len] = 0;
|
|
return buffer;
|
|
}
|
|
|
|
static ssize_t dasd_stats_write(struct file *file,
|
|
const char __user *user_buf,
|
|
size_t user_len, loff_t *pos)
|
|
{
|
|
char *buffer, *str;
|
|
int rc;
|
|
struct seq_file *m = (struct seq_file *)file->private_data;
|
|
struct dasd_profile *prof = m->private;
|
|
|
|
if (user_len > 65536)
|
|
user_len = 65536;
|
|
buffer = dasd_get_user_string(user_buf, user_len);
|
|
if (IS_ERR(buffer))
|
|
return PTR_ERR(buffer);
|
|
|
|
str = skip_spaces(buffer);
|
|
rc = user_len;
|
|
if (strncmp(str, "reset", 5) == 0) {
|
|
dasd_profile_reset(prof);
|
|
} else if (strncmp(str, "on", 2) == 0) {
|
|
rc = dasd_profile_on(prof);
|
|
if (rc)
|
|
goto out;
|
|
rc = user_len;
|
|
if (prof == &dasd_global_profile) {
|
|
dasd_profile_reset(prof);
|
|
dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
|
|
}
|
|
} else if (strncmp(str, "off", 3) == 0) {
|
|
if (prof == &dasd_global_profile)
|
|
dasd_global_profile_level = DASD_PROFILE_OFF;
|
|
dasd_profile_off(prof);
|
|
} else
|
|
rc = -EINVAL;
|
|
out:
|
|
vfree(buffer);
|
|
return rc;
|
|
}
|
|
|
|
static void dasd_stats_array(struct seq_file *m, unsigned int *array)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 32; i++)
|
|
seq_printf(m, "%u ", array[i]);
|
|
seq_putc(m, '\n');
|
|
}
|
|
|
|
static void dasd_stats_seq_print(struct seq_file *m,
|
|
struct dasd_profile_info *data)
|
|
{
|
|
seq_printf(m, "start_time %lld.%09ld\n",
|
|
(s64)data->starttod.tv_sec, data->starttod.tv_nsec);
|
|
seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
|
|
seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
|
|
seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
|
|
seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
|
|
seq_printf(m, "avg_total %lu\n", data->dasd_io_reqs ?
|
|
data->dasd_sum_times / data->dasd_io_reqs : 0UL);
|
|
seq_printf(m, "avg_build_to_ssch %lu\n", data->dasd_io_reqs ?
|
|
data->dasd_sum_time_str / data->dasd_io_reqs : 0UL);
|
|
seq_printf(m, "avg_ssch_to_irq %lu\n", data->dasd_io_reqs ?
|
|
data->dasd_sum_time_irq / data->dasd_io_reqs : 0UL);
|
|
seq_printf(m, "avg_irq_to_end %lu\n", data->dasd_io_reqs ?
|
|
data->dasd_sum_time_end / data->dasd_io_reqs : 0UL);
|
|
seq_puts(m, "histogram_sectors ");
|
|
dasd_stats_array(m, data->dasd_io_secs);
|
|
seq_puts(m, "histogram_io_times ");
|
|
dasd_stats_array(m, data->dasd_io_times);
|
|
seq_puts(m, "histogram_io_times_weighted ");
|
|
dasd_stats_array(m, data->dasd_io_timps);
|
|
seq_puts(m, "histogram_time_build_to_ssch ");
|
|
dasd_stats_array(m, data->dasd_io_time1);
|
|
seq_puts(m, "histogram_time_ssch_to_irq ");
|
|
dasd_stats_array(m, data->dasd_io_time2);
|
|
seq_puts(m, "histogram_time_ssch_to_irq_weighted ");
|
|
dasd_stats_array(m, data->dasd_io_time2ps);
|
|
seq_puts(m, "histogram_time_irq_to_end ");
|
|
dasd_stats_array(m, data->dasd_io_time3);
|
|
seq_puts(m, "histogram_ccw_queue_length ");
|
|
dasd_stats_array(m, data->dasd_io_nr_req);
|
|
seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
|
|
seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
|
|
seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
|
|
seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
|
|
seq_puts(m, "histogram_read_sectors ");
|
|
dasd_stats_array(m, data->dasd_read_secs);
|
|
seq_puts(m, "histogram_read_times ");
|
|
dasd_stats_array(m, data->dasd_read_times);
|
|
seq_puts(m, "histogram_read_time_build_to_ssch ");
|
|
dasd_stats_array(m, data->dasd_read_time1);
|
|
seq_puts(m, "histogram_read_time_ssch_to_irq ");
|
|
dasd_stats_array(m, data->dasd_read_time2);
|
|
seq_puts(m, "histogram_read_time_irq_to_end ");
|
|
dasd_stats_array(m, data->dasd_read_time3);
|
|
seq_puts(m, "histogram_read_ccw_queue_length ");
|
|
dasd_stats_array(m, data->dasd_read_nr_req);
|
|
}
|
|
|
|
static int dasd_stats_show(struct seq_file *m, void *v)
|
|
{
|
|
struct dasd_profile *profile;
|
|
struct dasd_profile_info *data;
|
|
|
|
profile = m->private;
|
|
spin_lock_bh(&profile->lock);
|
|
data = profile->data;
|
|
if (!data) {
|
|
spin_unlock_bh(&profile->lock);
|
|
seq_puts(m, "disabled\n");
|
|
return 0;
|
|
}
|
|
dasd_stats_seq_print(m, data);
|
|
spin_unlock_bh(&profile->lock);
|
|
return 0;
|
|
}
|
|
|
|
static int dasd_stats_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct dasd_profile *profile = inode->i_private;
|
|
return single_open(file, dasd_stats_show, profile);
|
|
}
|
|
|
|
static const struct file_operations dasd_stats_raw_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = dasd_stats_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
.write = dasd_stats_write,
|
|
};
|
|
|
|
static void dasd_profile_init(struct dasd_profile *profile,
|
|
struct dentry *base_dentry)
|
|
{
|
|
umode_t mode;
|
|
struct dentry *pde;
|
|
|
|
if (!base_dentry)
|
|
return;
|
|
profile->dentry = NULL;
|
|
profile->data = NULL;
|
|
mode = (S_IRUSR | S_IWUSR | S_IFREG);
|
|
pde = debugfs_create_file("statistics", mode, base_dentry,
|
|
profile, &dasd_stats_raw_fops);
|
|
if (pde && !IS_ERR(pde))
|
|
profile->dentry = pde;
|
|
return;
|
|
}
|
|
|
|
static void dasd_profile_exit(struct dasd_profile *profile)
|
|
{
|
|
dasd_profile_off(profile);
|
|
debugfs_remove(profile->dentry);
|
|
profile->dentry = NULL;
|
|
}
|
|
|
|
static void dasd_statistics_removeroot(void)
|
|
{
|
|
dasd_global_profile_level = DASD_PROFILE_OFF;
|
|
dasd_profile_exit(&dasd_global_profile);
|
|
debugfs_remove(dasd_debugfs_global_entry);
|
|
debugfs_remove(dasd_debugfs_root_entry);
|
|
}
|
|
|
|
static void dasd_statistics_createroot(void)
|
|
{
|
|
struct dentry *pde;
|
|
|
|
dasd_debugfs_root_entry = NULL;
|
|
pde = debugfs_create_dir("dasd", NULL);
|
|
if (!pde || IS_ERR(pde))
|
|
goto error;
|
|
dasd_debugfs_root_entry = pde;
|
|
pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
|
|
if (!pde || IS_ERR(pde))
|
|
goto error;
|
|
dasd_debugfs_global_entry = pde;
|
|
dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry);
|
|
return;
|
|
|
|
error:
|
|
DBF_EVENT(DBF_ERR, "%s",
|
|
"Creation of the dasd debugfs interface failed");
|
|
dasd_statistics_removeroot();
|
|
return;
|
|
}
|
|
|
|
#else
|
|
#define dasd_profile_start(block, cqr, req) do {} while (0)
|
|
#define dasd_profile_end(block, cqr, req) do {} while (0)
|
|
|
|
static void dasd_statistics_createroot(void)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static void dasd_statistics_removeroot(void)
|
|
{
|
|
return;
|
|
}
|
|
|
|
int dasd_stats_generic_show(struct seq_file *m, void *v)
|
|
{
|
|
seq_puts(m, "Statistics are not activated in this kernel\n");
|
|
return 0;
|
|
}
|
|
|
|
static void dasd_profile_init(struct dasd_profile *profile,
|
|
struct dentry *base_dentry)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static void dasd_profile_exit(struct dasd_profile *profile)
|
|
{
|
|
return;
|
|
}
|
|
|
|
int dasd_profile_on(struct dasd_profile *profile)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_DASD_PROFILE */
|
|
|
|
static int dasd_hosts_show(struct seq_file *m, void *v)
|
|
{
|
|
struct dasd_device *device;
|
|
int rc = -EOPNOTSUPP;
|
|
|
|
device = m->private;
|
|
dasd_get_device(device);
|
|
|
|
if (device->discipline->hosts_print)
|
|
rc = device->discipline->hosts_print(device, m);
|
|
|
|
dasd_put_device(device);
|
|
return rc;
|
|
}
|
|
|
|
DEFINE_SHOW_ATTRIBUTE(dasd_hosts);
|
|
|
|
static void dasd_hosts_exit(struct dasd_device *device)
|
|
{
|
|
debugfs_remove(device->hosts_dentry);
|
|
device->hosts_dentry = NULL;
|
|
}
|
|
|
|
static void dasd_hosts_init(struct dentry *base_dentry,
|
|
struct dasd_device *device)
|
|
{
|
|
struct dentry *pde;
|
|
umode_t mode;
|
|
|
|
if (!base_dentry)
|
|
return;
|
|
|
|
mode = S_IRUSR | S_IFREG;
|
|
pde = debugfs_create_file("host_access_list", mode, base_dentry,
|
|
device, &dasd_hosts_fops);
|
|
if (pde && !IS_ERR(pde))
|
|
device->hosts_dentry = pde;
|
|
}
|
|
|
|
struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, int datasize,
|
|
struct dasd_device *device,
|
|
struct dasd_ccw_req *cqr)
|
|
{
|
|
unsigned long flags;
|
|
char *data, *chunk;
|
|
int size = 0;
|
|
|
|
if (cplength > 0)
|
|
size += cplength * sizeof(struct ccw1);
|
|
if (datasize > 0)
|
|
size += datasize;
|
|
if (!cqr)
|
|
size += (sizeof(*cqr) + 7L) & -8L;
|
|
|
|
spin_lock_irqsave(&device->mem_lock, flags);
|
|
data = chunk = dasd_alloc_chunk(&device->ccw_chunks, size);
|
|
spin_unlock_irqrestore(&device->mem_lock, flags);
|
|
if (!chunk)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (!cqr) {
|
|
cqr = (void *) data;
|
|
data += (sizeof(*cqr) + 7L) & -8L;
|
|
}
|
|
memset(cqr, 0, sizeof(*cqr));
|
|
cqr->mem_chunk = chunk;
|
|
if (cplength > 0) {
|
|
cqr->cpaddr = data;
|
|
data += cplength * sizeof(struct ccw1);
|
|
memset(cqr->cpaddr, 0, cplength * sizeof(struct ccw1));
|
|
}
|
|
if (datasize > 0) {
|
|
cqr->data = data;
|
|
memset(cqr->data, 0, datasize);
|
|
}
|
|
cqr->magic = magic;
|
|
set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
|
|
dasd_get_device(device);
|
|
return cqr;
|
|
}
|
|
EXPORT_SYMBOL(dasd_smalloc_request);
|
|
|
|
void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&device->mem_lock, flags);
|
|
dasd_free_chunk(&device->ccw_chunks, cqr->mem_chunk);
|
|
spin_unlock_irqrestore(&device->mem_lock, flags);
|
|
dasd_put_device(device);
|
|
}
|
|
EXPORT_SYMBOL(dasd_sfree_request);
|
|
|
|
/*
|
|
* Check discipline magic in cqr.
|
|
*/
|
|
static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
|
|
if (cqr == NULL)
|
|
return -EINVAL;
|
|
device = cqr->startdev;
|
|
if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
|
|
DBF_DEV_EVENT(DBF_WARNING, device,
|
|
" dasd_ccw_req 0x%08x magic doesn't match"
|
|
" discipline 0x%08x",
|
|
cqr->magic,
|
|
*(unsigned int *) device->discipline->name);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Terminate the current i/o and set the request to clear_pending.
|
|
* Timer keeps device runnig.
|
|
* ccw_device_clear can fail if the i/o subsystem
|
|
* is in a bad mood.
|
|
*/
|
|
int dasd_term_IO(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
int retries, rc;
|
|
char errorstring[ERRORLENGTH];
|
|
|
|
/* Check the cqr */
|
|
rc = dasd_check_cqr(cqr);
|
|
if (rc)
|
|
return rc;
|
|
retries = 0;
|
|
device = (struct dasd_device *) cqr->startdev;
|
|
while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
|
|
rc = ccw_device_clear(device->cdev, (long) cqr);
|
|
switch (rc) {
|
|
case 0: /* termination successful */
|
|
cqr->status = DASD_CQR_CLEAR_PENDING;
|
|
cqr->stopclk = get_tod_clock();
|
|
cqr->starttime = 0;
|
|
DBF_DEV_EVENT(DBF_DEBUG, device,
|
|
"terminate cqr %p successful",
|
|
cqr);
|
|
break;
|
|
case -ENODEV:
|
|
DBF_DEV_EVENT(DBF_ERR, device, "%s",
|
|
"device gone, retry");
|
|
break;
|
|
case -EINVAL:
|
|
/*
|
|
* device not valid so no I/O could be running
|
|
* handle CQR as termination successful
|
|
*/
|
|
cqr->status = DASD_CQR_CLEARED;
|
|
cqr->stopclk = get_tod_clock();
|
|
cqr->starttime = 0;
|
|
/* no retries for invalid devices */
|
|
cqr->retries = -1;
|
|
DBF_DEV_EVENT(DBF_ERR, device, "%s",
|
|
"EINVAL, handle as terminated");
|
|
/* fake rc to success */
|
|
rc = 0;
|
|
break;
|
|
default:
|
|
/* internal error 10 - unknown rc*/
|
|
snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
|
|
dev_err(&device->cdev->dev, "An error occurred in the "
|
|
"DASD device driver, reason=%s\n", errorstring);
|
|
BUG();
|
|
break;
|
|
}
|
|
retries++;
|
|
}
|
|
dasd_schedule_device_bh(device);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(dasd_term_IO);
|
|
|
|
/*
|
|
* Start the i/o. This start_IO can fail if the channel is really busy.
|
|
* In that case set up a timer to start the request later.
|
|
*/
|
|
int dasd_start_IO(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
int rc;
|
|
char errorstring[ERRORLENGTH];
|
|
|
|
/* Check the cqr */
|
|
rc = dasd_check_cqr(cqr);
|
|
if (rc) {
|
|
cqr->intrc = rc;
|
|
return rc;
|
|
}
|
|
device = (struct dasd_device *) cqr->startdev;
|
|
if (((cqr->block &&
|
|
test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
|
|
test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
|
|
!test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
|
|
DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
|
|
"because of stolen lock", cqr);
|
|
cqr->status = DASD_CQR_ERROR;
|
|
cqr->intrc = -EPERM;
|
|
return -EPERM;
|
|
}
|
|
if (cqr->retries < 0) {
|
|
/* internal error 14 - start_IO run out of retries */
|
|
sprintf(errorstring, "14 %p", cqr);
|
|
dev_err(&device->cdev->dev, "An error occurred in the DASD "
|
|
"device driver, reason=%s\n", errorstring);
|
|
cqr->status = DASD_CQR_ERROR;
|
|
return -EIO;
|
|
}
|
|
cqr->startclk = get_tod_clock();
|
|
cqr->starttime = jiffies;
|
|
cqr->retries--;
|
|
if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
|
|
cqr->lpm &= dasd_path_get_opm(device);
|
|
if (!cqr->lpm)
|
|
cqr->lpm = dasd_path_get_opm(device);
|
|
}
|
|
if (cqr->cpmode == 1) {
|
|
rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
|
|
(long) cqr, cqr->lpm);
|
|
} else {
|
|
rc = ccw_device_start(device->cdev, cqr->cpaddr,
|
|
(long) cqr, cqr->lpm, 0);
|
|
}
|
|
switch (rc) {
|
|
case 0:
|
|
cqr->status = DASD_CQR_IN_IO;
|
|
break;
|
|
case -EBUSY:
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
"start_IO: device busy, retry later");
|
|
break;
|
|
case -EACCES:
|
|
/* -EACCES indicates that the request used only a subset of the
|
|
* available paths and all these paths are gone. If the lpm of
|
|
* this request was only a subset of the opm (e.g. the ppm) then
|
|
* we just do a retry with all available paths.
|
|
* If we already use the full opm, something is amiss, and we
|
|
* need a full path verification.
|
|
*/
|
|
if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
|
|
DBF_DEV_EVENT(DBF_WARNING, device,
|
|
"start_IO: selected paths gone (%x)",
|
|
cqr->lpm);
|
|
} else if (cqr->lpm != dasd_path_get_opm(device)) {
|
|
cqr->lpm = dasd_path_get_opm(device);
|
|
DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
|
|
"start_IO: selected paths gone,"
|
|
" retry on all paths");
|
|
} else {
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
"start_IO: all paths in opm gone,"
|
|
" do path verification");
|
|
dasd_generic_last_path_gone(device);
|
|
dasd_path_no_path(device);
|
|
dasd_path_set_tbvpm(device,
|
|
ccw_device_get_path_mask(
|
|
device->cdev));
|
|
}
|
|
break;
|
|
case -ENODEV:
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
"start_IO: -ENODEV device gone, retry");
|
|
break;
|
|
case -EIO:
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
"start_IO: -EIO device gone, retry");
|
|
break;
|
|
case -EINVAL:
|
|
/* most likely caused in power management context */
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
"start_IO: -EINVAL device currently "
|
|
"not accessible");
|
|
break;
|
|
default:
|
|
/* internal error 11 - unknown rc */
|
|
snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
|
|
dev_err(&device->cdev->dev,
|
|
"An error occurred in the DASD device driver, "
|
|
"reason=%s\n", errorstring);
|
|
BUG();
|
|
break;
|
|
}
|
|
cqr->intrc = rc;
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(dasd_start_IO);
|
|
|
|
/*
|
|
* Timeout function for dasd devices. This is used for different purposes
|
|
* 1) missing interrupt handler for normal operation
|
|
* 2) delayed start of request where start_IO failed with -EBUSY
|
|
* 3) timeout for missing state change interrupts
|
|
* The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
|
|
* DASD_CQR_QUEUED for 2) and 3).
|
|
*/
|
|
static void dasd_device_timeout(struct timer_list *t)
|
|
{
|
|
unsigned long flags;
|
|
struct dasd_device *device;
|
|
|
|
device = from_timer(device, t, timer);
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
|
/* re-activate request queue */
|
|
dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
dasd_schedule_device_bh(device);
|
|
}
|
|
|
|
/*
|
|
* Setup timeout for a device in jiffies.
|
|
*/
|
|
void dasd_device_set_timer(struct dasd_device *device, int expires)
|
|
{
|
|
if (expires == 0)
|
|
del_timer(&device->timer);
|
|
else
|
|
mod_timer(&device->timer, jiffies + expires);
|
|
}
|
|
EXPORT_SYMBOL(dasd_device_set_timer);
|
|
|
|
/*
|
|
* Clear timeout for a device.
|
|
*/
|
|
void dasd_device_clear_timer(struct dasd_device *device)
|
|
{
|
|
del_timer(&device->timer);
|
|
}
|
|
EXPORT_SYMBOL(dasd_device_clear_timer);
|
|
|
|
static void dasd_handle_killed_request(struct ccw_device *cdev,
|
|
unsigned long intparm)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
struct dasd_device *device;
|
|
|
|
if (!intparm)
|
|
return;
|
|
cqr = (struct dasd_ccw_req *) intparm;
|
|
if (cqr->status != DASD_CQR_IN_IO) {
|
|
DBF_EVENT_DEVID(DBF_DEBUG, cdev,
|
|
"invalid status in handle_killed_request: "
|
|
"%02x", cqr->status);
|
|
return;
|
|
}
|
|
|
|
device = dasd_device_from_cdev_locked(cdev);
|
|
if (IS_ERR(device)) {
|
|
DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
|
|
"unable to get device from cdev");
|
|
return;
|
|
}
|
|
|
|
if (!cqr->startdev ||
|
|
device != cqr->startdev ||
|
|
strncmp(cqr->startdev->discipline->ebcname,
|
|
(char *) &cqr->magic, 4)) {
|
|
DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
|
|
"invalid device in request");
|
|
dasd_put_device(device);
|
|
return;
|
|
}
|
|
|
|
/* Schedule request to be retried. */
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
|
|
dasd_device_clear_timer(device);
|
|
dasd_schedule_device_bh(device);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
void dasd_generic_handle_state_change(struct dasd_device *device)
|
|
{
|
|
/* First of all start sense subsystem status request. */
|
|
dasd_eer_snss(device);
|
|
|
|
dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
|
|
dasd_schedule_device_bh(device);
|
|
if (device->block) {
|
|
dasd_schedule_block_bh(device->block);
|
|
if (device->block->request_queue)
|
|
blk_mq_run_hw_queues(device->block->request_queue,
|
|
true);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
|
|
|
|
static int dasd_check_hpf_error(struct irb *irb)
|
|
{
|
|
return (scsw_tm_is_valid_schxs(&irb->scsw) &&
|
|
(irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX ||
|
|
irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX));
|
|
}
|
|
|
|
/*
|
|
* 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 now;
|
|
int nrf_suppressed = 0;
|
|
int fp_suppressed = 0;
|
|
u8 *sense = NULL;
|
|
int expires;
|
|
|
|
cqr = (struct dasd_ccw_req *) intparm;
|
|
if (IS_ERR(irb)) {
|
|
switch (PTR_ERR(irb)) {
|
|
case -EIO:
|
|
if (cqr && cqr->status == DASD_CQR_CLEAR_PENDING) {
|
|
device = cqr->startdev;
|
|
cqr->status = DASD_CQR_CLEARED;
|
|
dasd_device_clear_timer(device);
|
|
wake_up(&dasd_flush_wq);
|
|
dasd_schedule_device_bh(device);
|
|
return;
|
|
}
|
|
break;
|
|
case -ETIMEDOUT:
|
|
DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
|
|
"request timed out\n", __func__);
|
|
break;
|
|
default:
|
|
DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
|
|
"unknown error %ld\n", __func__,
|
|
PTR_ERR(irb));
|
|
}
|
|
dasd_handle_killed_request(cdev, intparm);
|
|
return;
|
|
}
|
|
|
|
now = get_tod_clock();
|
|
/* check for conditions that should be handled immediately */
|
|
if (!cqr ||
|
|
!(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
|
|
scsw_cstat(&irb->scsw) == 0)) {
|
|
if (cqr)
|
|
memcpy(&cqr->irb, irb, sizeof(*irb));
|
|
device = dasd_device_from_cdev_locked(cdev);
|
|
if (IS_ERR(device))
|
|
return;
|
|
/* ignore unsolicited interrupts for DIAG discipline */
|
|
if (device->discipline == dasd_diag_discipline_pointer) {
|
|
dasd_put_device(device);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* In some cases 'File Protected' or 'No Record Found' errors
|
|
* might be expected and debug log messages for the
|
|
* corresponding interrupts shouldn't be written then.
|
|
* Check if either of the according suppress bits is set.
|
|
*/
|
|
sense = dasd_get_sense(irb);
|
|
if (sense) {
|
|
fp_suppressed = (sense[1] & SNS1_FILE_PROTECTED) &&
|
|
test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
|
|
nrf_suppressed = (sense[1] & SNS1_NO_REC_FOUND) &&
|
|
test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
|
|
}
|
|
if (!(fp_suppressed || nrf_suppressed))
|
|
device->discipline->dump_sense_dbf(device, irb, "int");
|
|
|
|
if (device->features & DASD_FEATURE_ERPLOG)
|
|
device->discipline->dump_sense(device, cqr, irb);
|
|
device->discipline->check_for_device_change(device, cqr, irb);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
/* check for for attention message */
|
|
if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) {
|
|
device = dasd_device_from_cdev_locked(cdev);
|
|
if (!IS_ERR(device)) {
|
|
device->discipline->check_attention(device,
|
|
irb->esw.esw1.lpum);
|
|
dasd_put_device(device);
|
|
}
|
|
}
|
|
|
|
if (!cqr)
|
|
return;
|
|
|
|
device = (struct dasd_device *) cqr->startdev;
|
|
if (!device ||
|
|
strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
|
|
DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
|
|
"invalid device in request");
|
|
return;
|
|
}
|
|
|
|
/* Check for clear pending */
|
|
if (cqr->status == DASD_CQR_CLEAR_PENDING &&
|
|
scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
|
|
cqr->status = DASD_CQR_CLEARED;
|
|
dasd_device_clear_timer(device);
|
|
wake_up(&dasd_flush_wq);
|
|
dasd_schedule_device_bh(device);
|
|
return;
|
|
}
|
|
|
|
/* check status - the request might have been killed by dyn detach */
|
|
if (cqr->status != DASD_CQR_IN_IO) {
|
|
DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
|
|
"status %02x", dev_name(&cdev->dev), cqr->status);
|
|
return;
|
|
}
|
|
|
|
next = NULL;
|
|
expires = 0;
|
|
if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
|
|
scsw_cstat(&irb->scsw) == 0) {
|
|
/* request was completed successfully */
|
|
cqr->status = DASD_CQR_SUCCESS;
|
|
cqr->stopclk = now;
|
|
/* Start first request on queue if possible -> fast_io. */
|
|
if (cqr->devlist.next != &device->ccw_queue) {
|
|
next = list_entry(cqr->devlist.next,
|
|
struct dasd_ccw_req, devlist);
|
|
}
|
|
} else { /* error */
|
|
/* check for HPF error
|
|
* call discipline function to requeue all requests
|
|
* and disable HPF accordingly
|
|
*/
|
|
if (cqr->cpmode && dasd_check_hpf_error(irb) &&
|
|
device->discipline->handle_hpf_error)
|
|
device->discipline->handle_hpf_error(device, irb);
|
|
/*
|
|
* If we don't want complex ERP for this request, then just
|
|
* reset this and retry it in the fastpath
|
|
*/
|
|
if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
|
|
cqr->retries > 0) {
|
|
if (cqr->lpm == dasd_path_get_opm(device))
|
|
DBF_DEV_EVENT(DBF_DEBUG, device,
|
|
"default ERP in fastpath "
|
|
"(%i retries left)",
|
|
cqr->retries);
|
|
if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
|
|
cqr->lpm = dasd_path_get_opm(device);
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
next = cqr;
|
|
} else
|
|
cqr->status = DASD_CQR_ERROR;
|
|
}
|
|
if (next && (next->status == DASD_CQR_QUEUED) &&
|
|
(!device->stopped)) {
|
|
if (device->discipline->start_IO(next) == 0)
|
|
expires = next->expires;
|
|
}
|
|
if (expires != 0)
|
|
dasd_device_set_timer(device, expires);
|
|
else
|
|
dasd_device_clear_timer(device);
|
|
dasd_schedule_device_bh(device);
|
|
}
|
|
EXPORT_SYMBOL(dasd_int_handler);
|
|
|
|
enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
|
|
{
|
|
struct dasd_device *device;
|
|
|
|
device = dasd_device_from_cdev_locked(cdev);
|
|
|
|
if (IS_ERR(device))
|
|
goto out;
|
|
if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
|
|
device->state != device->target ||
|
|
!device->discipline->check_for_device_change){
|
|
dasd_put_device(device);
|
|
goto out;
|
|
}
|
|
if (device->discipline->dump_sense_dbf)
|
|
device->discipline->dump_sense_dbf(device, irb, "uc");
|
|
device->discipline->check_for_device_change(device, NULL, irb);
|
|
dasd_put_device(device);
|
|
out:
|
|
return UC_TODO_RETRY;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
|
|
|
|
/*
|
|
* If we have an error on a dasd_block layer request then we cancel
|
|
* and return all further requests from the same dasd_block as well.
|
|
*/
|
|
static void __dasd_device_recovery(struct dasd_device *device,
|
|
struct dasd_ccw_req *ref_cqr)
|
|
{
|
|
struct list_head *l, *n;
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
/*
|
|
* only requeue request that came from the dasd_block layer
|
|
*/
|
|
if (!ref_cqr->block)
|
|
return;
|
|
|
|
list_for_each_safe(l, n, &device->ccw_queue) {
|
|
cqr = list_entry(l, struct dasd_ccw_req, devlist);
|
|
if (cqr->status == DASD_CQR_QUEUED &&
|
|
ref_cqr->block == cqr->block) {
|
|
cqr->status = DASD_CQR_CLEARED;
|
|
}
|
|
}
|
|
};
|
|
|
|
/*
|
|
* Remove those ccw requests from the queue that need to be returned
|
|
* to the upper layer.
|
|
*/
|
|
static void __dasd_device_process_ccw_queue(struct dasd_device *device,
|
|
struct list_head *final_queue)
|
|
{
|
|
struct list_head *l, *n;
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
/* Process request with final status. */
|
|
list_for_each_safe(l, n, &device->ccw_queue) {
|
|
cqr = list_entry(l, struct dasd_ccw_req, devlist);
|
|
|
|
/* Skip any non-final request. */
|
|
if (cqr->status == DASD_CQR_QUEUED ||
|
|
cqr->status == DASD_CQR_IN_IO ||
|
|
cqr->status == DASD_CQR_CLEAR_PENDING)
|
|
continue;
|
|
if (cqr->status == DASD_CQR_ERROR) {
|
|
__dasd_device_recovery(device, cqr);
|
|
}
|
|
/* Rechain finished requests to final queue */
|
|
list_move_tail(&cqr->devlist, final_queue);
|
|
}
|
|
}
|
|
|
|
static void __dasd_process_cqr(struct dasd_device *device,
|
|
struct dasd_ccw_req *cqr)
|
|
{
|
|
char errorstring[ERRORLENGTH];
|
|
|
|
switch (cqr->status) {
|
|
case DASD_CQR_SUCCESS:
|
|
cqr->status = DASD_CQR_DONE;
|
|
break;
|
|
case DASD_CQR_ERROR:
|
|
cqr->status = DASD_CQR_NEED_ERP;
|
|
break;
|
|
case DASD_CQR_CLEARED:
|
|
cqr->status = DASD_CQR_TERMINATED;
|
|
break;
|
|
default:
|
|
/* internal error 12 - wrong cqr status*/
|
|
snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
|
|
dev_err(&device->cdev->dev,
|
|
"An error occurred in the DASD device driver, "
|
|
"reason=%s\n", errorstring);
|
|
BUG();
|
|
}
|
|
if (cqr->callback)
|
|
cqr->callback(cqr, cqr->callback_data);
|
|
}
|
|
|
|
/*
|
|
* the cqrs from the final queue are returned to the upper layer
|
|
* by setting a dasd_block state and calling the callback function
|
|
*/
|
|
static void __dasd_device_process_final_queue(struct dasd_device *device,
|
|
struct list_head *final_queue)
|
|
{
|
|
struct list_head *l, *n;
|
|
struct dasd_ccw_req *cqr;
|
|
struct dasd_block *block;
|
|
|
|
list_for_each_safe(l, n, final_queue) {
|
|
cqr = list_entry(l, struct dasd_ccw_req, devlist);
|
|
list_del_init(&cqr->devlist);
|
|
block = cqr->block;
|
|
if (!block) {
|
|
__dasd_process_cqr(device, cqr);
|
|
} else {
|
|
spin_lock_bh(&block->queue_lock);
|
|
__dasd_process_cqr(device, cqr);
|
|
spin_unlock_bh(&block->queue_lock);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Take a look at the first request on the ccw queue and check
|
|
* if it reached its expire time. If so, terminate the IO.
|
|
*/
|
|
static void __dasd_device_check_expire(struct dasd_device *device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
if (list_empty(&device->ccw_queue))
|
|
return;
|
|
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
|
|
if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
|
|
(time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
|
|
if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
|
|
/*
|
|
* IO in safe offline processing should not
|
|
* run out of retries
|
|
*/
|
|
cqr->retries++;
|
|
}
|
|
if (device->discipline->term_IO(cqr) != 0) {
|
|
/* Hmpf, try again in 5 sec */
|
|
dev_err(&device->cdev->dev,
|
|
"cqr %p timed out (%lus) but cannot be "
|
|
"ended, retrying in 5 s\n",
|
|
cqr, (cqr->expires/HZ));
|
|
cqr->expires += 5*HZ;
|
|
dasd_device_set_timer(device, 5*HZ);
|
|
} else {
|
|
dev_err(&device->cdev->dev,
|
|
"cqr %p timed out (%lus), %i retries "
|
|
"remaining\n", cqr, (cqr->expires/HZ),
|
|
cqr->retries);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* return 1 when device is not eligible for IO
|
|
*/
|
|
static int __dasd_device_is_unusable(struct dasd_device *device,
|
|
struct dasd_ccw_req *cqr)
|
|
{
|
|
int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM);
|
|
|
|
if (test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
|
|
!test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
|
|
/*
|
|
* dasd is being set offline
|
|
* but it is no safe offline where we have to allow I/O
|
|
*/
|
|
return 1;
|
|
}
|
|
if (device->stopped) {
|
|
if (device->stopped & mask) {
|
|
/* stopped and CQR will not change that. */
|
|
return 1;
|
|
}
|
|
if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
|
|
/* CQR is not able to change device to
|
|
* operational. */
|
|
return 1;
|
|
}
|
|
/* CQR required to get device operational. */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Take a look at the first request on the ccw queue and check
|
|
* if it needs to be started.
|
|
*/
|
|
static void __dasd_device_start_head(struct dasd_device *device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
int rc;
|
|
|
|
if (list_empty(&device->ccw_queue))
|
|
return;
|
|
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
|
|
if (cqr->status != DASD_CQR_QUEUED)
|
|
return;
|
|
/* if device is not usable return request to upper layer */
|
|
if (__dasd_device_is_unusable(device, cqr)) {
|
|
cqr->intrc = -EAGAIN;
|
|
cqr->status = DASD_CQR_CLEARED;
|
|
dasd_schedule_device_bh(device);
|
|
return;
|
|
}
|
|
|
|
rc = device->discipline->start_IO(cqr);
|
|
if (rc == 0)
|
|
dasd_device_set_timer(device, cqr->expires);
|
|
else if (rc == -EACCES) {
|
|
dasd_schedule_device_bh(device);
|
|
} else
|
|
/* Hmpf, try again in 1/2 sec */
|
|
dasd_device_set_timer(device, 50);
|
|
}
|
|
|
|
static void __dasd_device_check_path_events(struct dasd_device *device)
|
|
{
|
|
int rc;
|
|
|
|
if (!dasd_path_get_tbvpm(device))
|
|
return;
|
|
|
|
if (device->stopped &
|
|
~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
|
|
return;
|
|
rc = device->discipline->verify_path(device,
|
|
dasd_path_get_tbvpm(device));
|
|
if (rc)
|
|
dasd_device_set_timer(device, 50);
|
|
else
|
|
dasd_path_clear_all_verify(device);
|
|
};
|
|
|
|
/*
|
|
* Go through all request on the dasd_device request queue,
|
|
* terminate them on the cdev if necessary, and return them to the
|
|
* submitting layer via callback.
|
|
* Note:
|
|
* Make sure that all 'submitting layers' still exist when
|
|
* this function is called!. In other words, when 'device' is a base
|
|
* device then all block layer requests must have been removed before
|
|
* via dasd_flush_block_queue.
|
|
*/
|
|
int dasd_flush_device_queue(struct dasd_device *device)
|
|
{
|
|
struct dasd_ccw_req *cqr, *n;
|
|
int rc;
|
|
struct list_head flush_queue;
|
|
|
|
INIT_LIST_HEAD(&flush_queue);
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
rc = 0;
|
|
list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
|
|
/* Check status and move request to flush_queue */
|
|
switch (cqr->status) {
|
|
case DASD_CQR_IN_IO:
|
|
rc = device->discipline->term_IO(cqr);
|
|
if (rc) {
|
|
/* unable to terminate requeust */
|
|
dev_err(&device->cdev->dev,
|
|
"Flushing the DASD request queue "
|
|
"failed for request %p\n", cqr);
|
|
/* stop flush processing */
|
|
goto finished;
|
|
}
|
|
break;
|
|
case DASD_CQR_QUEUED:
|
|
cqr->stopclk = get_tod_clock();
|
|
cqr->status = DASD_CQR_CLEARED;
|
|
break;
|
|
default: /* no need to modify the others */
|
|
break;
|
|
}
|
|
list_move_tail(&cqr->devlist, &flush_queue);
|
|
}
|
|
finished:
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
/*
|
|
* After this point all requests must be in state CLEAR_PENDING,
|
|
* CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
|
|
* one of the others.
|
|
*/
|
|
list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
|
|
wait_event(dasd_flush_wq,
|
|
(cqr->status != DASD_CQR_CLEAR_PENDING));
|
|
/*
|
|
* Now set each request back to TERMINATED, DONE or NEED_ERP
|
|
* and call the callback function of flushed requests
|
|
*/
|
|
__dasd_device_process_final_queue(device, &flush_queue);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
|
|
|
|
/*
|
|
* Acquire the device lock and process queues for the device.
|
|
*/
|
|
static void dasd_device_tasklet(unsigned long data)
|
|
{
|
|
struct dasd_device *device = (struct dasd_device *) data;
|
|
struct list_head final_queue;
|
|
|
|
atomic_set (&device->tasklet_scheduled, 0);
|
|
INIT_LIST_HEAD(&final_queue);
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
/* Check expire time of first request on the ccw queue. */
|
|
__dasd_device_check_expire(device);
|
|
/* find final requests on ccw queue */
|
|
__dasd_device_process_ccw_queue(device, &final_queue);
|
|
__dasd_device_check_path_events(device);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
/* Now call the callback function of requests with final status */
|
|
__dasd_device_process_final_queue(device, &final_queue);
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
/* Now check if the head of the ccw queue needs to be started. */
|
|
__dasd_device_start_head(device);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
if (waitqueue_active(&shutdown_waitq))
|
|
wake_up(&shutdown_waitq);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
/*
|
|
* Schedules a call to dasd_tasklet over the device tasklet.
|
|
*/
|
|
void dasd_schedule_device_bh(struct dasd_device *device)
|
|
{
|
|
/* Protect against rescheduling. */
|
|
if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
|
|
return;
|
|
dasd_get_device(device);
|
|
tasklet_hi_schedule(&device->tasklet);
|
|
}
|
|
EXPORT_SYMBOL(dasd_schedule_device_bh);
|
|
|
|
void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
|
|
{
|
|
device->stopped |= bits;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
|
|
|
|
void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
|
|
{
|
|
device->stopped &= ~bits;
|
|
if (!device->stopped)
|
|
wake_up(&generic_waitq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
|
|
|
|
/*
|
|
* Queue a request to the head of the device ccw_queue.
|
|
* Start the I/O if possible.
|
|
*/
|
|
void dasd_add_request_head(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
unsigned long flags;
|
|
|
|
device = cqr->startdev;
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
list_add(&cqr->devlist, &device->ccw_queue);
|
|
/* let the bh start the request to keep them in order */
|
|
dasd_schedule_device_bh(device);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
}
|
|
EXPORT_SYMBOL(dasd_add_request_head);
|
|
|
|
/*
|
|
* Queue a request to the tail of the device ccw_queue.
|
|
* Start the I/O if possible.
|
|
*/
|
|
void dasd_add_request_tail(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
unsigned long flags;
|
|
|
|
device = cqr->startdev;
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
list_add_tail(&cqr->devlist, &device->ccw_queue);
|
|
/* let the bh start the request to keep them in order */
|
|
dasd_schedule_device_bh(device);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
}
|
|
EXPORT_SYMBOL(dasd_add_request_tail);
|
|
|
|
/*
|
|
* Wakeup helper for the 'sleep_on' functions.
|
|
*/
|
|
void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
|
|
{
|
|
spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
|
|
cqr->callback_data = DASD_SLEEPON_END_TAG;
|
|
spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
|
|
wake_up(&generic_waitq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
|
|
|
|
static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
int rc;
|
|
|
|
device = cqr->startdev;
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
|
|
*/
|
|
static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
dasd_erp_fn_t erp_fn;
|
|
|
|
if (cqr->status == DASD_CQR_FILLED)
|
|
return 0;
|
|
device = cqr->startdev;
|
|
if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
|
|
if (cqr->status == DASD_CQR_TERMINATED) {
|
|
device->discipline->handle_terminated_request(cqr);
|
|
return 1;
|
|
}
|
|
if (cqr->status == DASD_CQR_NEED_ERP) {
|
|
erp_fn = device->discipline->erp_action(cqr);
|
|
erp_fn(cqr);
|
|
return 1;
|
|
}
|
|
if (cqr->status == DASD_CQR_FAILED)
|
|
dasd_log_sense(cqr, &cqr->irb);
|
|
if (cqr->refers) {
|
|
__dasd_process_erp(device, cqr);
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
|
|
{
|
|
if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
|
|
if (cqr->refers) /* erp is not done yet */
|
|
return 1;
|
|
return ((cqr->status != DASD_CQR_DONE) &&
|
|
(cqr->status != DASD_CQR_FAILED));
|
|
} else
|
|
return (cqr->status == DASD_CQR_FILLED);
|
|
}
|
|
|
|
static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
|
|
{
|
|
struct dasd_device *device;
|
|
int rc;
|
|
struct list_head ccw_queue;
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
INIT_LIST_HEAD(&ccw_queue);
|
|
maincqr->status = DASD_CQR_FILLED;
|
|
device = maincqr->startdev;
|
|
list_add(&maincqr->blocklist, &ccw_queue);
|
|
for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
|
|
cqr = list_first_entry(&ccw_queue,
|
|
struct dasd_ccw_req, blocklist)) {
|
|
|
|
if (__dasd_sleep_on_erp(cqr))
|
|
continue;
|
|
if (cqr->status != DASD_CQR_FILLED) /* could be failed */
|
|
continue;
|
|
if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
|
|
!test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
cqr->intrc = -EPERM;
|
|
continue;
|
|
}
|
|
/* Non-temporary stop condition will trigger fail fast */
|
|
if (device->stopped & ~DASD_STOPPED_PENDING &&
|
|
test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
|
|
(!dasd_eer_enabled(device))) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
cqr->intrc = -ENOLINK;
|
|
continue;
|
|
}
|
|
/*
|
|
* Don't try to start requests if device is in
|
|
* offline processing, it might wait forever
|
|
*/
|
|
if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
cqr->intrc = -ENODEV;
|
|
continue;
|
|
}
|
|
/*
|
|
* Don't try to start requests if device is stopped
|
|
* except path verification requests
|
|
*/
|
|
if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
|
|
if (interruptible) {
|
|
rc = wait_event_interruptible(
|
|
generic_waitq, !(device->stopped));
|
|
if (rc == -ERESTARTSYS) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
maincqr->intrc = rc;
|
|
continue;
|
|
}
|
|
} else
|
|
wait_event(generic_waitq, !(device->stopped));
|
|
}
|
|
if (!cqr->callback)
|
|
cqr->callback = dasd_wakeup_cb;
|
|
|
|
cqr->callback_data = DASD_SLEEPON_START_TAG;
|
|
dasd_add_request_tail(cqr);
|
|
if (interruptible) {
|
|
rc = wait_event_interruptible(
|
|
generic_waitq, _wait_for_wakeup(cqr));
|
|
if (rc == -ERESTARTSYS) {
|
|
dasd_cancel_req(cqr);
|
|
/* wait (non-interruptible) for final status */
|
|
wait_event(generic_waitq,
|
|
_wait_for_wakeup(cqr));
|
|
cqr->status = DASD_CQR_FAILED;
|
|
maincqr->intrc = rc;
|
|
continue;
|
|
}
|
|
} else
|
|
wait_event(generic_waitq, _wait_for_wakeup(cqr));
|
|
}
|
|
|
|
maincqr->endclk = get_tod_clock();
|
|
if ((maincqr->status != DASD_CQR_DONE) &&
|
|
(maincqr->intrc != -ERESTARTSYS))
|
|
dasd_log_sense(maincqr, &maincqr->irb);
|
|
if (maincqr->status == DASD_CQR_DONE)
|
|
rc = 0;
|
|
else if (maincqr->intrc)
|
|
rc = maincqr->intrc;
|
|
else
|
|
rc = -EIO;
|
|
return rc;
|
|
}
|
|
|
|
static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
list_for_each_entry(cqr, ccw_queue, blocklist) {
|
|
if (cqr->callback_data != DASD_SLEEPON_END_TAG)
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
|
|
{
|
|
struct dasd_device *device;
|
|
struct dasd_ccw_req *cqr, *n;
|
|
u8 *sense = NULL;
|
|
int rc;
|
|
|
|
retry:
|
|
list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
|
|
device = cqr->startdev;
|
|
if (cqr->status != DASD_CQR_FILLED) /*could be failed*/
|
|
continue;
|
|
|
|
if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
|
|
!test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
cqr->intrc = -EPERM;
|
|
continue;
|
|
}
|
|
/*Non-temporary stop condition will trigger fail fast*/
|
|
if (device->stopped & ~DASD_STOPPED_PENDING &&
|
|
test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
|
|
!dasd_eer_enabled(device)) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
cqr->intrc = -EAGAIN;
|
|
continue;
|
|
}
|
|
|
|
/*Don't try to start requests if device is stopped*/
|
|
if (interruptible) {
|
|
rc = wait_event_interruptible(
|
|
generic_waitq, !device->stopped);
|
|
if (rc == -ERESTARTSYS) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
cqr->intrc = rc;
|
|
continue;
|
|
}
|
|
} else
|
|
wait_event(generic_waitq, !(device->stopped));
|
|
|
|
if (!cqr->callback)
|
|
cqr->callback = dasd_wakeup_cb;
|
|
cqr->callback_data = DASD_SLEEPON_START_TAG;
|
|
dasd_add_request_tail(cqr);
|
|
}
|
|
|
|
wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue));
|
|
|
|
rc = 0;
|
|
list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
|
|
/*
|
|
* In some cases the 'File Protected' or 'Incorrect Length'
|
|
* error might be expected and error recovery would be
|
|
* unnecessary in these cases. Check if the according suppress
|
|
* bit is set.
|
|
*/
|
|
sense = dasd_get_sense(&cqr->irb);
|
|
if (sense && sense[1] & SNS1_FILE_PROTECTED &&
|
|
test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags))
|
|
continue;
|
|
if (scsw_cstat(&cqr->irb.scsw) == 0x40 &&
|
|
test_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags))
|
|
continue;
|
|
|
|
/*
|
|
* for alias devices simplify error recovery and
|
|
* return to upper layer
|
|
* do not skip ERP requests
|
|
*/
|
|
if (cqr->startdev != cqr->basedev && !cqr->refers &&
|
|
(cqr->status == DASD_CQR_TERMINATED ||
|
|
cqr->status == DASD_CQR_NEED_ERP))
|
|
return -EAGAIN;
|
|
|
|
/* normal recovery for basedev IO */
|
|
if (__dasd_sleep_on_erp(cqr))
|
|
/* handle erp first */
|
|
goto retry;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Queue a request to the tail of the device ccw_queue and wait for
|
|
* it's completion.
|
|
*/
|
|
int dasd_sleep_on(struct dasd_ccw_req *cqr)
|
|
{
|
|
return _dasd_sleep_on(cqr, 0);
|
|
}
|
|
EXPORT_SYMBOL(dasd_sleep_on);
|
|
|
|
/*
|
|
* Start requests from a ccw_queue and wait for their completion.
|
|
*/
|
|
int dasd_sleep_on_queue(struct list_head *ccw_queue)
|
|
{
|
|
return _dasd_sleep_on_queue(ccw_queue, 0);
|
|
}
|
|
EXPORT_SYMBOL(dasd_sleep_on_queue);
|
|
|
|
/*
|
|
* Queue a request to the tail of the device ccw_queue and wait
|
|
* interruptible for it's completion.
|
|
*/
|
|
int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
|
|
{
|
|
return _dasd_sleep_on(cqr, 1);
|
|
}
|
|
EXPORT_SYMBOL(dasd_sleep_on_interruptible);
|
|
|
|
/*
|
|
* Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
|
|
* for eckd devices) the currently running request has to be terminated
|
|
* and be put back to status queued, before the special request is added
|
|
* to the head of the queue. Then the special request is waited on normally.
|
|
*/
|
|
static inline int _dasd_term_running_cqr(struct dasd_device *device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
int rc;
|
|
|
|
if (list_empty(&device->ccw_queue))
|
|
return 0;
|
|
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
|
|
rc = device->discipline->term_IO(cqr);
|
|
if (!rc)
|
|
/*
|
|
* CQR terminated because a more important request is pending.
|
|
* Undo decreasing of retry counter because this is
|
|
* not an error case.
|
|
*/
|
|
cqr->retries++;
|
|
return rc;
|
|
}
|
|
|
|
int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device;
|
|
int rc;
|
|
|
|
device = cqr->startdev;
|
|
if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
|
|
!test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
cqr->intrc = -EPERM;
|
|
return -EIO;
|
|
}
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
rc = _dasd_term_running_cqr(device);
|
|
if (rc) {
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
return rc;
|
|
}
|
|
cqr->callback = dasd_wakeup_cb;
|
|
cqr->callback_data = DASD_SLEEPON_START_TAG;
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
/*
|
|
* add new request as second
|
|
* first the terminated cqr needs to be finished
|
|
*/
|
|
list_add(&cqr->devlist, device->ccw_queue.next);
|
|
|
|
/* let the bh start the request to keep them in order */
|
|
dasd_schedule_device_bh(device);
|
|
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
|
|
wait_event(generic_waitq, _wait_for_wakeup(cqr));
|
|
|
|
if (cqr->status == DASD_CQR_DONE)
|
|
rc = 0;
|
|
else if (cqr->intrc)
|
|
rc = cqr->intrc;
|
|
else
|
|
rc = -EIO;
|
|
|
|
/* kick tasklets */
|
|
dasd_schedule_device_bh(device);
|
|
if (device->block)
|
|
dasd_schedule_block_bh(device->block);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(dasd_sleep_on_immediatly);
|
|
|
|
/*
|
|
* Cancels a request that was started with dasd_sleep_on_req.
|
|
* This is useful to timeout requests. The request will be
|
|
* terminated if it is currently in i/o.
|
|
* Returns 0 if request termination was successful
|
|
* negative error code if termination failed
|
|
* Cancellation of a request is an asynchronous operation! The calling
|
|
* function has to wait until the request is properly returned via callback.
|
|
*/
|
|
static int __dasd_cancel_req(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device = cqr->startdev;
|
|
int rc = 0;
|
|
|
|
switch (cqr->status) {
|
|
case DASD_CQR_QUEUED:
|
|
/* request was not started - just set to cleared */
|
|
cqr->status = DASD_CQR_CLEARED;
|
|
break;
|
|
case DASD_CQR_IN_IO:
|
|
/* request in IO - terminate IO and release again */
|
|
rc = device->discipline->term_IO(cqr);
|
|
if (rc) {
|
|
dev_err(&device->cdev->dev,
|
|
"Cancelling request %p failed with rc=%d\n",
|
|
cqr, rc);
|
|
} else {
|
|
cqr->stopclk = get_tod_clock();
|
|
}
|
|
break;
|
|
default: /* already finished or clear pending - do nothing */
|
|
break;
|
|
}
|
|
dasd_schedule_device_bh(device);
|
|
return rc;
|
|
}
|
|
|
|
int dasd_cancel_req(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_device *device = cqr->startdev;
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
|
rc = __dasd_cancel_req(cqr);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* SECTION: Operations of the dasd_block layer.
|
|
*/
|
|
|
|
/*
|
|
* Timeout function for dasd_block. This is used when the block layer
|
|
* is waiting for something that may not come reliably, (e.g. a state
|
|
* change interrupt)
|
|
*/
|
|
static void dasd_block_timeout(struct timer_list *t)
|
|
{
|
|
unsigned long flags;
|
|
struct dasd_block *block;
|
|
|
|
block = from_timer(block, t, timer);
|
|
spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
|
|
/* re-activate request queue */
|
|
dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
|
|
dasd_schedule_block_bh(block);
|
|
blk_mq_run_hw_queues(block->request_queue, true);
|
|
}
|
|
|
|
/*
|
|
* Setup timeout for a dasd_block in jiffies.
|
|
*/
|
|
void dasd_block_set_timer(struct dasd_block *block, int expires)
|
|
{
|
|
if (expires == 0)
|
|
del_timer(&block->timer);
|
|
else
|
|
mod_timer(&block->timer, jiffies + expires);
|
|
}
|
|
EXPORT_SYMBOL(dasd_block_set_timer);
|
|
|
|
/*
|
|
* Clear timeout for a dasd_block.
|
|
*/
|
|
void dasd_block_clear_timer(struct dasd_block *block)
|
|
{
|
|
del_timer(&block->timer);
|
|
}
|
|
EXPORT_SYMBOL(dasd_block_clear_timer);
|
|
|
|
/*
|
|
* Process finished error recovery ccw.
|
|
*/
|
|
static void __dasd_process_erp(struct dasd_device *device,
|
|
struct dasd_ccw_req *cqr)
|
|
{
|
|
dasd_erp_fn_t erp_fn;
|
|
|
|
if (cqr->status == DASD_CQR_DONE)
|
|
DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
|
|
else
|
|
dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
|
|
erp_fn = device->discipline->erp_postaction(cqr);
|
|
erp_fn(cqr);
|
|
}
|
|
|
|
static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct request *req;
|
|
blk_status_t error = BLK_STS_OK;
|
|
int status;
|
|
|
|
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 = errno_to_blk_status(status);
|
|
else if (status == 0) {
|
|
switch (cqr->intrc) {
|
|
case -EPERM:
|
|
error = BLK_STS_NEXUS;
|
|
break;
|
|
case -ENOLINK:
|
|
error = BLK_STS_TRANSPORT;
|
|
break;
|
|
case -ETIMEDOUT:
|
|
error = BLK_STS_TIMEOUT;
|
|
break;
|
|
default:
|
|
error = BLK_STS_IOERR;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We need to take care for ETIMEDOUT errors here since the
|
|
* complete callback does not get called in this case.
|
|
* Take care of all errors here and avoid additional code to
|
|
* transfer the error value to the complete callback.
|
|
*/
|
|
if (error) {
|
|
blk_mq_end_request(req, error);
|
|
blk_mq_run_hw_queues(req->q, true);
|
|
} else {
|
|
blk_mq_complete_request(req);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Process ccw request queue.
|
|
*/
|
|
static void __dasd_process_block_ccw_queue(struct dasd_block *block,
|
|
struct list_head *final_queue)
|
|
{
|
|
struct list_head *l, *n;
|
|
struct dasd_ccw_req *cqr;
|
|
dasd_erp_fn_t erp_fn;
|
|
unsigned long flags;
|
|
struct dasd_device *base = block->base;
|
|
|
|
restart:
|
|
/* Process request with final status. */
|
|
list_for_each_safe(l, n, &block->ccw_queue) {
|
|
cqr = list_entry(l, struct dasd_ccw_req, blocklist);
|
|
if (cqr->status != DASD_CQR_DONE &&
|
|
cqr->status != DASD_CQR_FAILED &&
|
|
cqr->status != DASD_CQR_NEED_ERP &&
|
|
cqr->status != DASD_CQR_TERMINATED)
|
|
continue;
|
|
|
|
if (cqr->status == DASD_CQR_TERMINATED) {
|
|
base->discipline->handle_terminated_request(cqr);
|
|
goto restart;
|
|
}
|
|
|
|
/* Process requests that may be recovered */
|
|
if (cqr->status == DASD_CQR_NEED_ERP) {
|
|
erp_fn = base->discipline->erp_action(cqr);
|
|
if (IS_ERR(erp_fn(cqr)))
|
|
continue;
|
|
goto restart;
|
|
}
|
|
|
|
/* log sense for fatal error */
|
|
if (cqr->status == DASD_CQR_FAILED) {
|
|
dasd_log_sense(cqr, &cqr->irb);
|
|
}
|
|
|
|
/* First of all call extended error reporting. */
|
|
if (dasd_eer_enabled(base) &&
|
|
cqr->status == DASD_CQR_FAILED) {
|
|
dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
|
|
|
|
/* restart request */
|
|
cqr->status = DASD_CQR_FILLED;
|
|
cqr->retries = 255;
|
|
spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
|
|
dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
|
|
flags);
|
|
goto restart;
|
|
}
|
|
|
|
/* Process finished ERP request. */
|
|
if (cqr->refers) {
|
|
__dasd_process_erp(base, cqr);
|
|
goto restart;
|
|
}
|
|
|
|
/* Rechain finished requests to final queue */
|
|
cqr->endclk = get_tod_clock();
|
|
list_move_tail(&cqr->blocklist, final_queue);
|
|
}
|
|
}
|
|
|
|
static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
|
|
{
|
|
dasd_schedule_block_bh(cqr->block);
|
|
}
|
|
|
|
static void __dasd_block_start_head(struct dasd_block *block)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
if (list_empty(&block->ccw_queue))
|
|
return;
|
|
/* We allways begin with the first requests on the queue, as some
|
|
* of previously started requests have to be enqueued on a
|
|
* dasd_device again for error recovery.
|
|
*/
|
|
list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
|
|
if (cqr->status != DASD_CQR_FILLED)
|
|
continue;
|
|
if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
|
|
!test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
cqr->intrc = -EPERM;
|
|
dasd_schedule_block_bh(block);
|
|
continue;
|
|
}
|
|
/* Non-temporary stop condition will trigger fail fast */
|
|
if (block->base->stopped & ~DASD_STOPPED_PENDING &&
|
|
test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
|
|
(!dasd_eer_enabled(block->base))) {
|
|
cqr->status = DASD_CQR_FAILED;
|
|
cqr->intrc = -ENOLINK;
|
|
dasd_schedule_block_bh(block);
|
|
continue;
|
|
}
|
|
/* Don't try to start requests if device is stopped */
|
|
if (block->base->stopped)
|
|
return;
|
|
|
|
/* just a fail safe check, should not happen */
|
|
if (!cqr->startdev)
|
|
cqr->startdev = block->base;
|
|
|
|
/* make sure that the requests we submit find their way back */
|
|
cqr->callback = dasd_return_cqr_cb;
|
|
|
|
dasd_add_request_tail(cqr);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Central dasd_block layer routine. Takes requests from the generic
|
|
* block layer request queue, creates ccw requests, enqueues them on
|
|
* a dasd_device and processes ccw requests that have been returned.
|
|
*/
|
|
static void dasd_block_tasklet(unsigned long data)
|
|
{
|
|
struct dasd_block *block = (struct dasd_block *) data;
|
|
struct list_head final_queue;
|
|
struct list_head *l, *n;
|
|
struct dasd_ccw_req *cqr;
|
|
struct dasd_queue *dq;
|
|
|
|
atomic_set(&block->tasklet_scheduled, 0);
|
|
INIT_LIST_HEAD(&final_queue);
|
|
spin_lock_irq(&block->queue_lock);
|
|
/* Finish off requests on ccw queue */
|
|
__dasd_process_block_ccw_queue(block, &final_queue);
|
|
spin_unlock_irq(&block->queue_lock);
|
|
|
|
/* Now call the callback function of requests with final status */
|
|
list_for_each_safe(l, n, &final_queue) {
|
|
cqr = list_entry(l, struct dasd_ccw_req, blocklist);
|
|
dq = cqr->dq;
|
|
spin_lock_irq(&dq->lock);
|
|
list_del_init(&cqr->blocklist);
|
|
__dasd_cleanup_cqr(cqr);
|
|
spin_unlock_irq(&dq->lock);
|
|
}
|
|
|
|
spin_lock_irq(&block->queue_lock);
|
|
/* Now check if the head of the ccw queue needs to be started. */
|
|
__dasd_block_start_head(block);
|
|
spin_unlock_irq(&block->queue_lock);
|
|
|
|
if (waitqueue_active(&shutdown_waitq))
|
|
wake_up(&shutdown_waitq);
|
|
dasd_put_device(block->base);
|
|
}
|
|
|
|
static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
|
|
{
|
|
wake_up(&dasd_flush_wq);
|
|
}
|
|
|
|
/*
|
|
* Requeue a request back to the block request queue
|
|
* only works for block requests
|
|
*/
|
|
static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
|
|
{
|
|
struct dasd_block *block = cqr->block;
|
|
struct request *req;
|
|
|
|
if (!block)
|
|
return -EINVAL;
|
|
spin_lock_irq(&cqr->dq->lock);
|
|
req = (struct request *) cqr->callback_data;
|
|
blk_mq_requeue_request(req, false);
|
|
spin_unlock_irq(&cqr->dq->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Go through all request on the dasd_block request queue, cancel them
|
|
* on the respective dasd_device, and return them to the generic
|
|
* block layer.
|
|
*/
|
|
static int dasd_flush_block_queue(struct dasd_block *block)
|
|
{
|
|
struct dasd_ccw_req *cqr, *n;
|
|
int rc, i;
|
|
struct list_head flush_queue;
|
|
unsigned long flags;
|
|
|
|
INIT_LIST_HEAD(&flush_queue);
|
|
spin_lock_bh(&block->queue_lock);
|
|
rc = 0;
|
|
restart:
|
|
list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
|
|
/* if this request currently owned by a dasd_device cancel it */
|
|
if (cqr->status >= DASD_CQR_QUEUED)
|
|
rc = dasd_cancel_req(cqr);
|
|
if (rc < 0)
|
|
break;
|
|
/* Rechain request (including erp chain) so it won't be
|
|
* touched by the dasd_block_tasklet anymore.
|
|
* Replace the callback so we notice when the request
|
|
* is returned from the dasd_device layer.
|
|
*/
|
|
cqr->callback = _dasd_wake_block_flush_cb;
|
|
for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
|
|
list_move_tail(&cqr->blocklist, &flush_queue);
|
|
if (i > 1)
|
|
/* moved more than one request - need to restart */
|
|
goto restart;
|
|
}
|
|
spin_unlock_bh(&block->queue_lock);
|
|
/* Now call the callback function of flushed requests */
|
|
restart_cb:
|
|
list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
|
|
wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
|
|
/* Process finished ERP request. */
|
|
if (cqr->refers) {
|
|
spin_lock_bh(&block->queue_lock);
|
|
__dasd_process_erp(block->base, cqr);
|
|
spin_unlock_bh(&block->queue_lock);
|
|
/* restart list_for_xx loop since dasd_process_erp
|
|
* might remove multiple elements */
|
|
goto restart_cb;
|
|
}
|
|
/* call the callback function */
|
|
spin_lock_irqsave(&cqr->dq->lock, flags);
|
|
cqr->endclk = get_tod_clock();
|
|
list_del_init(&cqr->blocklist);
|
|
__dasd_cleanup_cqr(cqr);
|
|
spin_unlock_irqrestore(&cqr->dq->lock, flags);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Schedules a call to dasd_tasklet over the device tasklet.
|
|
*/
|
|
void dasd_schedule_block_bh(struct dasd_block *block)
|
|
{
|
|
/* Protect against rescheduling. */
|
|
if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
|
|
return;
|
|
/* life cycle of block is bound to it's base device */
|
|
dasd_get_device(block->base);
|
|
tasklet_hi_schedule(&block->tasklet);
|
|
}
|
|
EXPORT_SYMBOL(dasd_schedule_block_bh);
|
|
|
|
|
|
/*
|
|
* SECTION: external block device operations
|
|
* (request queue handling, open, release, etc.)
|
|
*/
|
|
|
|
/*
|
|
* Dasd request queue function. Called from ll_rw_blk.c
|
|
*/
|
|
static blk_status_t do_dasd_request(struct blk_mq_hw_ctx *hctx,
|
|
const struct blk_mq_queue_data *qd)
|
|
{
|
|
struct dasd_block *block = hctx->queue->queuedata;
|
|
struct dasd_queue *dq = hctx->driver_data;
|
|
struct request *req = qd->rq;
|
|
struct dasd_device *basedev;
|
|
struct dasd_ccw_req *cqr;
|
|
blk_status_t rc = BLK_STS_OK;
|
|
|
|
basedev = block->base;
|
|
spin_lock_irq(&dq->lock);
|
|
if (basedev->state < DASD_STATE_READY) {
|
|
DBF_DEV_EVENT(DBF_ERR, basedev,
|
|
"device not ready for request %p", req);
|
|
rc = BLK_STS_IOERR;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* if device is stopped do not fetch new requests
|
|
* except failfast is active which will let requests fail
|
|
* immediately in __dasd_block_start_head()
|
|
*/
|
|
if (basedev->stopped && !(basedev->features & DASD_FEATURE_FAILFAST)) {
|
|
DBF_DEV_EVENT(DBF_ERR, basedev,
|
|
"device stopped request %p", req);
|
|
rc = BLK_STS_RESOURCE;
|
|
goto out;
|
|
}
|
|
|
|
if (basedev->features & DASD_FEATURE_READONLY &&
|
|
rq_data_dir(req) == WRITE) {
|
|
DBF_DEV_EVENT(DBF_ERR, basedev,
|
|
"Rejecting write request %p", req);
|
|
rc = BLK_STS_IOERR;
|
|
goto out;
|
|
}
|
|
|
|
if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) &&
|
|
(basedev->features & DASD_FEATURE_FAILFAST ||
|
|
blk_noretry_request(req))) {
|
|
DBF_DEV_EVENT(DBF_ERR, basedev,
|
|
"Rejecting failfast request %p", req);
|
|
rc = BLK_STS_IOERR;
|
|
goto out;
|
|
}
|
|
|
|
cqr = basedev->discipline->build_cp(basedev, block, req);
|
|
if (IS_ERR(cqr)) {
|
|
if (PTR_ERR(cqr) == -EBUSY ||
|
|
PTR_ERR(cqr) == -ENOMEM ||
|
|
PTR_ERR(cqr) == -EAGAIN) {
|
|
rc = BLK_STS_RESOURCE;
|
|
goto out;
|
|
}
|
|
DBF_DEV_EVENT(DBF_ERR, basedev,
|
|
"CCW creation failed (rc=%ld) on request %p",
|
|
PTR_ERR(cqr), req);
|
|
rc = BLK_STS_IOERR;
|
|
goto out;
|
|
}
|
|
/*
|
|
* Note: callback is set to dasd_return_cqr_cb in
|
|
* __dasd_block_start_head to cover erp requests as well
|
|
*/
|
|
cqr->callback_data = req;
|
|
cqr->status = DASD_CQR_FILLED;
|
|
cqr->dq = dq;
|
|
|
|
blk_mq_start_request(req);
|
|
spin_lock(&block->queue_lock);
|
|
list_add_tail(&cqr->blocklist, &block->ccw_queue);
|
|
INIT_LIST_HEAD(&cqr->devlist);
|
|
dasd_profile_start(block, cqr, req);
|
|
dasd_schedule_block_bh(block);
|
|
spin_unlock(&block->queue_lock);
|
|
|
|
out:
|
|
spin_unlock_irq(&dq->lock);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Block timeout callback, called from the block layer
|
|
*
|
|
* Return values:
|
|
* BLK_EH_RESET_TIMER if the request should be left running
|
|
* BLK_EH_DONE if the request is handled or terminated
|
|
* by the driver.
|
|
*/
|
|
enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved)
|
|
{
|
|
struct dasd_block *block = req->q->queuedata;
|
|
struct dasd_device *device;
|
|
struct dasd_ccw_req *cqr;
|
|
unsigned long flags;
|
|
int rc = 0;
|
|
|
|
cqr = blk_mq_rq_to_pdu(req);
|
|
if (!cqr)
|
|
return BLK_EH_DONE;
|
|
|
|
spin_lock_irqsave(&cqr->dq->lock, flags);
|
|
device = cqr->startdev ? cqr->startdev : block->base;
|
|
if (!device->blk_timeout) {
|
|
spin_unlock_irqrestore(&cqr->dq->lock, flags);
|
|
return BLK_EH_RESET_TIMER;
|
|
}
|
|
DBF_DEV_EVENT(DBF_WARNING, device,
|
|
" dasd_times_out cqr %p status %x",
|
|
cqr, cqr->status);
|
|
|
|
spin_lock(&block->queue_lock);
|
|
spin_lock(get_ccwdev_lock(device->cdev));
|
|
cqr->retries = -1;
|
|
cqr->intrc = -ETIMEDOUT;
|
|
if (cqr->status >= DASD_CQR_QUEUED) {
|
|
rc = __dasd_cancel_req(cqr);
|
|
} else if (cqr->status == DASD_CQR_FILLED ||
|
|
cqr->status == DASD_CQR_NEED_ERP) {
|
|
cqr->status = DASD_CQR_TERMINATED;
|
|
} else if (cqr->status == DASD_CQR_IN_ERP) {
|
|
struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr;
|
|
|
|
list_for_each_entry_safe(searchcqr, nextcqr,
|
|
&block->ccw_queue, blocklist) {
|
|
tmpcqr = searchcqr;
|
|
while (tmpcqr->refers)
|
|
tmpcqr = tmpcqr->refers;
|
|
if (tmpcqr != cqr)
|
|
continue;
|
|
/* searchcqr is an ERP request for cqr */
|
|
searchcqr->retries = -1;
|
|
searchcqr->intrc = -ETIMEDOUT;
|
|
if (searchcqr->status >= DASD_CQR_QUEUED) {
|
|
rc = __dasd_cancel_req(searchcqr);
|
|
} else if ((searchcqr->status == DASD_CQR_FILLED) ||
|
|
(searchcqr->status == DASD_CQR_NEED_ERP)) {
|
|
searchcqr->status = DASD_CQR_TERMINATED;
|
|
rc = 0;
|
|
} else if (searchcqr->status == DASD_CQR_IN_ERP) {
|
|
/*
|
|
* Shouldn't happen; most recent ERP
|
|
* request is at the front of queue
|
|
*/
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(get_ccwdev_lock(device->cdev));
|
|
dasd_schedule_block_bh(block);
|
|
spin_unlock(&block->queue_lock);
|
|
spin_unlock_irqrestore(&cqr->dq->lock, flags);
|
|
|
|
return rc ? BLK_EH_RESET_TIMER : BLK_EH_DONE;
|
|
}
|
|
|
|
static int dasd_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
|
|
unsigned int idx)
|
|
{
|
|
struct dasd_queue *dq = kzalloc(sizeof(*dq), GFP_KERNEL);
|
|
|
|
if (!dq)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&dq->lock);
|
|
hctx->driver_data = dq;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dasd_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int idx)
|
|
{
|
|
kfree(hctx->driver_data);
|
|
hctx->driver_data = NULL;
|
|
}
|
|
|
|
static void dasd_request_done(struct request *req)
|
|
{
|
|
blk_mq_end_request(req, 0);
|
|
blk_mq_run_hw_queues(req->q, true);
|
|
}
|
|
|
|
static struct blk_mq_ops dasd_mq_ops = {
|
|
.queue_rq = do_dasd_request,
|
|
.complete = dasd_request_done,
|
|
.timeout = dasd_times_out,
|
|
.init_hctx = dasd_init_hctx,
|
|
.exit_hctx = dasd_exit_hctx,
|
|
};
|
|
|
|
/*
|
|
* Allocate and initialize request queue and default I/O scheduler.
|
|
*/
|
|
static int dasd_alloc_queue(struct dasd_block *block)
|
|
{
|
|
int rc;
|
|
|
|
block->tag_set.ops = &dasd_mq_ops;
|
|
block->tag_set.cmd_size = sizeof(struct dasd_ccw_req);
|
|
block->tag_set.nr_hw_queues = nr_hw_queues;
|
|
block->tag_set.queue_depth = queue_depth;
|
|
block->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
|
|
block->tag_set.numa_node = NUMA_NO_NODE;
|
|
|
|
rc = blk_mq_alloc_tag_set(&block->tag_set);
|
|
if (rc)
|
|
return rc;
|
|
|
|
block->request_queue = blk_mq_init_queue(&block->tag_set);
|
|
if (IS_ERR(block->request_queue))
|
|
return PTR_ERR(block->request_queue);
|
|
|
|
block->request_queue->queuedata = block;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialize request queue.
|
|
*/
|
|
static void dasd_setup_queue(struct dasd_block *block)
|
|
{
|
|
unsigned int logical_block_size = block->bp_block;
|
|
struct request_queue *q = block->request_queue;
|
|
unsigned int max_bytes, max_discard_sectors;
|
|
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_flag_set(QUEUE_FLAG_NONROT, q);
|
|
q->limits.max_dev_sectors = max;
|
|
blk_queue_logical_block_size(q, logical_block_size);
|
|
blk_queue_max_hw_sectors(q, max);
|
|
blk_queue_max_segments(q, USHRT_MAX);
|
|
/* with page sized segments we can translate each segement into
|
|
* one idaw/tidaw
|
|
*/
|
|
blk_queue_max_segment_size(q, PAGE_SIZE);
|
|
blk_queue_segment_boundary(q, PAGE_SIZE - 1);
|
|
|
|
/* Only activate blocklayer discard support for devices that support it */
|
|
if (block->base->features & DASD_FEATURE_DISCARD) {
|
|
q->limits.discard_granularity = logical_block_size;
|
|
q->limits.discard_alignment = PAGE_SIZE;
|
|
|
|
/* Calculate max_discard_sectors and make it PAGE aligned */
|
|
max_bytes = USHRT_MAX * logical_block_size;
|
|
max_bytes = ALIGN(max_bytes, PAGE_SIZE) - PAGE_SIZE;
|
|
max_discard_sectors = max_bytes / logical_block_size;
|
|
|
|
blk_queue_max_discard_sectors(q, max_discard_sectors);
|
|
blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
|
|
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Deactivate and free request queue.
|
|
*/
|
|
static void dasd_free_queue(struct dasd_block *block)
|
|
{
|
|
if (block->request_queue) {
|
|
blk_cleanup_queue(block->request_queue);
|
|
blk_mq_free_tag_set(&block->tag_set);
|
|
block->request_queue = NULL;
|
|
}
|
|
}
|
|
|
|
static int dasd_open(struct block_device *bdev, fmode_t mode)
|
|
{
|
|
struct dasd_device *base;
|
|
int rc;
|
|
|
|
base = dasd_device_from_gendisk(bdev->bd_disk);
|
|
if (!base)
|
|
return -ENODEV;
|
|
|
|
atomic_inc(&base->block->open_count);
|
|
if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
|
|
rc = -ENODEV;
|
|
goto unlock;
|
|
}
|
|
|
|
if (!try_module_get(base->discipline->owner)) {
|
|
rc = -EINVAL;
|
|
goto unlock;
|
|
}
|
|
|
|
if (dasd_probeonly) {
|
|
dev_info(&base->cdev->dev,
|
|
"Accessing the DASD failed because it is in "
|
|
"probeonly mode\n");
|
|
rc = -EPERM;
|
|
goto out;
|
|
}
|
|
|
|
if (base->state <= DASD_STATE_BASIC) {
|
|
DBF_DEV_EVENT(DBF_ERR, base, " %s",
|
|
" Cannot open unrecognized device");
|
|
rc = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
if ((mode & FMODE_WRITE) &&
|
|
(test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
|
|
(base->features & DASD_FEATURE_READONLY))) {
|
|
rc = -EROFS;
|
|
goto out;
|
|
}
|
|
|
|
dasd_put_device(base);
|
|
return 0;
|
|
|
|
out:
|
|
module_put(base->discipline->owner);
|
|
unlock:
|
|
atomic_dec(&base->block->open_count);
|
|
dasd_put_device(base);
|
|
return rc;
|
|
}
|
|
|
|
static void dasd_release(struct gendisk *disk, fmode_t mode)
|
|
{
|
|
struct dasd_device *base = dasd_device_from_gendisk(disk);
|
|
if (base) {
|
|
atomic_dec(&base->block->open_count);
|
|
module_put(base->discipline->owner);
|
|
dasd_put_device(base);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return disk geometry.
|
|
*/
|
|
static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
|
|
{
|
|
struct dasd_device *base;
|
|
|
|
base = dasd_device_from_gendisk(bdev->bd_disk);
|
|
if (!base)
|
|
return -ENODEV;
|
|
|
|
if (!base->discipline ||
|
|
!base->discipline->fill_geometry) {
|
|
dasd_put_device(base);
|
|
return -EINVAL;
|
|
}
|
|
base->discipline->fill_geometry(base->block, geo);
|
|
geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
|
|
dasd_put_device(base);
|
|
return 0;
|
|
}
|
|
|
|
const struct block_device_operations
|
|
dasd_device_operations = {
|
|
.owner = THIS_MODULE,
|
|
.open = dasd_open,
|
|
.release = dasd_release,
|
|
.ioctl = dasd_ioctl,
|
|
.compat_ioctl = dasd_ioctl,
|
|
.getgeo = dasd_getgeo,
|
|
};
|
|
|
|
/*******************************************************************************
|
|
* end of block device operations
|
|
*/
|
|
|
|
static void
|
|
dasd_exit(void)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
dasd_proc_exit();
|
|
#endif
|
|
dasd_eer_exit();
|
|
kmem_cache_destroy(dasd_page_cache);
|
|
dasd_page_cache = NULL;
|
|
dasd_gendisk_exit();
|
|
dasd_devmap_exit();
|
|
if (dasd_debug_area != NULL) {
|
|
debug_unregister(dasd_debug_area);
|
|
dasd_debug_area = NULL;
|
|
}
|
|
dasd_statistics_removeroot();
|
|
}
|
|
|
|
/*
|
|
* SECTION: common functions for ccw_driver use
|
|
*/
|
|
|
|
/*
|
|
* Is the device read-only?
|
|
* Note that this function does not report the setting of the
|
|
* readonly device attribute, but how it is configured in z/VM.
|
|
*/
|
|
int dasd_device_is_ro(struct dasd_device *device)
|
|
{
|
|
struct ccw_dev_id dev_id;
|
|
struct diag210 diag_data;
|
|
int rc;
|
|
|
|
if (!MACHINE_IS_VM)
|
|
return 0;
|
|
ccw_device_get_id(device->cdev, &dev_id);
|
|
memset(&diag_data, 0, sizeof(diag_data));
|
|
diag_data.vrdcdvno = dev_id.devno;
|
|
diag_data.vrdclen = sizeof(diag_data);
|
|
rc = diag210(&diag_data);
|
|
if (rc == 0 || rc == 2) {
|
|
return diag_data.vrdcvfla & 0x80;
|
|
} else {
|
|
DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
|
|
dev_id.devno, rc);
|
|
return 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_device_is_ro);
|
|
|
|
static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
|
|
{
|
|
struct ccw_device *cdev = data;
|
|
int ret;
|
|
|
|
ret = ccw_device_set_online(cdev);
|
|
if (ret)
|
|
pr_warn("%s: Setting the DASD online failed with rc=%d\n",
|
|
dev_name(&cdev->dev), ret);
|
|
}
|
|
|
|
/*
|
|
* Initial attempt at a probe function. this can be simplified once
|
|
* the other detection code is gone.
|
|
*/
|
|
int dasd_generic_probe(struct ccw_device *cdev,
|
|
struct dasd_discipline *discipline)
|
|
{
|
|
int ret;
|
|
|
|
ret = dasd_add_sysfs_files(cdev);
|
|
if (ret) {
|
|
DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
|
|
"dasd_generic_probe: could not add "
|
|
"sysfs entries");
|
|
return ret;
|
|
}
|
|
cdev->handler = &dasd_int_handler;
|
|
|
|
/*
|
|
* Automatically online either all dasd devices (dasd_autodetect)
|
|
* or all devices specified with dasd= parameters during
|
|
* initial probe.
|
|
*/
|
|
if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
|
|
(dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
|
|
async_schedule(dasd_generic_auto_online, cdev);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_probe);
|
|
|
|
void dasd_generic_free_discipline(struct dasd_device *device)
|
|
{
|
|
/* Forget the discipline information. */
|
|
if (device->discipline) {
|
|
if (device->discipline->uncheck_device)
|
|
device->discipline->uncheck_device(device);
|
|
module_put(device->discipline->owner);
|
|
device->discipline = NULL;
|
|
}
|
|
if (device->base_discipline) {
|
|
module_put(device->base_discipline->owner);
|
|
device->base_discipline = NULL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_free_discipline);
|
|
|
|
/*
|
|
* This will one day be called from a global not_oper handler.
|
|
* It is also used by driver_unregister during module unload.
|
|
*/
|
|
void dasd_generic_remove(struct ccw_device *cdev)
|
|
{
|
|
struct dasd_device *device;
|
|
struct dasd_block *block;
|
|
|
|
cdev->handler = NULL;
|
|
|
|
device = dasd_device_from_cdev(cdev);
|
|
if (IS_ERR(device)) {
|
|
dasd_remove_sysfs_files(cdev);
|
|
return;
|
|
}
|
|
if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
|
|
!test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
|
|
/* Already doing offline processing */
|
|
dasd_put_device(device);
|
|
dasd_remove_sysfs_files(cdev);
|
|
return;
|
|
}
|
|
/*
|
|
* This device is removed unconditionally. Set offline
|
|
* flag to prevent dasd_open from opening it while it is
|
|
* no quite down yet.
|
|
*/
|
|
dasd_set_target_state(device, DASD_STATE_NEW);
|
|
/* dasd_delete_device destroys the device reference. */
|
|
block = device->block;
|
|
dasd_delete_device(device);
|
|
/*
|
|
* life cycle of block is bound to device, so delete it after
|
|
* device was safely removed
|
|
*/
|
|
if (block)
|
|
dasd_free_block(block);
|
|
|
|
dasd_remove_sysfs_files(cdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_remove);
|
|
|
|
/*
|
|
* Activate a device. This is called from dasd_{eckd,fba}_probe() when either
|
|
* the device is detected for the first time and is supposed to be used
|
|
* or the user has started activation through sysfs.
|
|
*/
|
|
int dasd_generic_set_online(struct ccw_device *cdev,
|
|
struct dasd_discipline *base_discipline)
|
|
{
|
|
struct dasd_discipline *discipline;
|
|
struct dasd_device *device;
|
|
int rc;
|
|
|
|
/* first online clears initial online feature flag */
|
|
dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
|
|
device = dasd_create_device(cdev);
|
|
if (IS_ERR(device))
|
|
return PTR_ERR(device);
|
|
|
|
discipline = base_discipline;
|
|
if (device->features & DASD_FEATURE_USEDIAG) {
|
|
if (!dasd_diag_discipline_pointer) {
|
|
/* Try to load the required module. */
|
|
rc = request_module(DASD_DIAG_MOD);
|
|
if (rc) {
|
|
pr_warn("%s Setting the DASD online failed "
|
|
"because the required module %s "
|
|
"could not be loaded (rc=%d)\n",
|
|
dev_name(&cdev->dev), DASD_DIAG_MOD,
|
|
rc);
|
|
dasd_delete_device(device);
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
/* Module init could have failed, so check again here after
|
|
* request_module(). */
|
|
if (!dasd_diag_discipline_pointer) {
|
|
pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
|
|
dev_name(&cdev->dev));
|
|
dasd_delete_device(device);
|
|
return -ENODEV;
|
|
}
|
|
discipline = dasd_diag_discipline_pointer;
|
|
}
|
|
if (!try_module_get(base_discipline->owner)) {
|
|
dasd_delete_device(device);
|
|
return -EINVAL;
|
|
}
|
|
if (!try_module_get(discipline->owner)) {
|
|
module_put(base_discipline->owner);
|
|
dasd_delete_device(device);
|
|
return -EINVAL;
|
|
}
|
|
device->base_discipline = base_discipline;
|
|
device->discipline = discipline;
|
|
|
|
/* check_device will allocate block device if necessary */
|
|
rc = discipline->check_device(device);
|
|
if (rc) {
|
|
pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
|
|
dev_name(&cdev->dev), discipline->name, rc);
|
|
module_put(discipline->owner);
|
|
module_put(base_discipline->owner);
|
|
dasd_delete_device(device);
|
|
return rc;
|
|
}
|
|
|
|
dasd_set_target_state(device, DASD_STATE_ONLINE);
|
|
if (device->state <= DASD_STATE_KNOWN) {
|
|
pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
|
|
dev_name(&cdev->dev));
|
|
rc = -ENODEV;
|
|
dasd_set_target_state(device, DASD_STATE_NEW);
|
|
if (device->block)
|
|
dasd_free_block(device->block);
|
|
dasd_delete_device(device);
|
|
} else
|
|
pr_debug("dasd_generic device %s found\n",
|
|
dev_name(&cdev->dev));
|
|
|
|
wait_event(dasd_init_waitq, _wait_for_device(device));
|
|
|
|
dasd_put_device(device);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_set_online);
|
|
|
|
int dasd_generic_set_offline(struct ccw_device *cdev)
|
|
{
|
|
struct dasd_device *device;
|
|
struct dasd_block *block;
|
|
int max_count, open_count, rc;
|
|
unsigned long flags;
|
|
|
|
rc = 0;
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
device = dasd_device_from_cdev_locked(cdev);
|
|
if (IS_ERR(device)) {
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
return PTR_ERR(device);
|
|
}
|
|
|
|
/*
|
|
* We must make sure that this device is currently not in use.
|
|
* The open_count is increased for every opener, that includes
|
|
* the blkdev_get in dasd_scan_partitions. We are only interested
|
|
* in the other openers.
|
|
*/
|
|
if (device->block) {
|
|
max_count = device->block->bdev ? 0 : -1;
|
|
open_count = atomic_read(&device->block->open_count);
|
|
if (open_count > max_count) {
|
|
if (open_count > 0)
|
|
pr_warn("%s: The DASD cannot be set offline with open count %i\n",
|
|
dev_name(&cdev->dev), open_count);
|
|
else
|
|
pr_warn("%s: The DASD cannot be set offline while it is in use\n",
|
|
dev_name(&cdev->dev));
|
|
rc = -EBUSY;
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Test if the offline processing is already running and exit if so.
|
|
* If a safe offline is being processed this could only be a normal
|
|
* offline that should be able to overtake the safe offline and
|
|
* cancel any I/O we do not want to wait for any longer
|
|
*/
|
|
if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
|
|
if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
|
|
clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING,
|
|
&device->flags);
|
|
} else {
|
|
rc = -EBUSY;
|
|
goto out_err;
|
|
}
|
|
}
|
|
set_bit(DASD_FLAG_OFFLINE, &device->flags);
|
|
|
|
/*
|
|
* if safe_offline is called set safe_offline_running flag and
|
|
* clear safe_offline so that a call to normal offline
|
|
* can overrun safe_offline processing
|
|
*/
|
|
if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) &&
|
|
!test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
|
|
/* need to unlock here to wait for outstanding I/O */
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
/*
|
|
* If we want to set the device safe offline all IO operations
|
|
* should be finished before continuing the offline process
|
|
* so sync bdev first and then wait for our queues to become
|
|
* empty
|
|
*/
|
|
if (device->block) {
|
|
rc = fsync_bdev(device->block->bdev);
|
|
if (rc != 0)
|
|
goto interrupted;
|
|
}
|
|
dasd_schedule_device_bh(device);
|
|
rc = wait_event_interruptible(shutdown_waitq,
|
|
_wait_for_empty_queues(device));
|
|
if (rc != 0)
|
|
goto interrupted;
|
|
|
|
/*
|
|
* check if a normal offline process overtook the offline
|
|
* processing in this case simply do nothing beside returning
|
|
* that we got interrupted
|
|
* otherwise mark safe offline as not running any longer and
|
|
* continue with normal offline
|
|
*/
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
if (!test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
|
|
rc = -ERESTARTSYS;
|
|
goto out_err;
|
|
}
|
|
clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
|
|
dasd_set_target_state(device, DASD_STATE_NEW);
|
|
/* dasd_delete_device destroys the device reference. */
|
|
block = device->block;
|
|
dasd_delete_device(device);
|
|
/*
|
|
* life cycle of block is bound to device, so delete it after
|
|
* device was safely removed
|
|
*/
|
|
if (block)
|
|
dasd_free_block(block);
|
|
|
|
return 0;
|
|
|
|
interrupted:
|
|
/* interrupted by signal */
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
|
|
clear_bit(DASD_FLAG_OFFLINE, &device->flags);
|
|
out_err:
|
|
dasd_put_device(device);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
|
|
|
|
int dasd_generic_last_path_gone(struct dasd_device *device)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
dev_warn(&device->cdev->dev, "No operational channel path is left "
|
|
"for the device\n");
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
|
|
/* First of all call extended error reporting. */
|
|
dasd_eer_write(device, NULL, DASD_EER_NOPATH);
|
|
|
|
if (device->state < DASD_STATE_BASIC)
|
|
return 0;
|
|
/* Device is active. We want to keep it. */
|
|
list_for_each_entry(cqr, &device->ccw_queue, devlist)
|
|
if ((cqr->status == DASD_CQR_IN_IO) ||
|
|
(cqr->status == DASD_CQR_CLEAR_PENDING)) {
|
|
cqr->status = DASD_CQR_QUEUED;
|
|
cqr->retries++;
|
|
}
|
|
dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
|
|
dasd_device_clear_timer(device);
|
|
dasd_schedule_device_bh(device);
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
|
|
|
|
int dasd_generic_path_operational(struct dasd_device *device)
|
|
{
|
|
dev_info(&device->cdev->dev, "A channel path to the device has become "
|
|
"operational\n");
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
|
|
dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
|
|
if (device->stopped & DASD_UNRESUMED_PM) {
|
|
dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
|
|
dasd_restore_device(device);
|
|
return 1;
|
|
}
|
|
dasd_schedule_device_bh(device);
|
|
if (device->block) {
|
|
dasd_schedule_block_bh(device->block);
|
|
if (device->block->request_queue)
|
|
blk_mq_run_hw_queues(device->block->request_queue,
|
|
true);
|
|
}
|
|
|
|
if (!device->stopped)
|
|
wake_up(&generic_waitq);
|
|
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
|
|
|
|
int dasd_generic_notify(struct ccw_device *cdev, int event)
|
|
{
|
|
struct dasd_device *device;
|
|
int ret;
|
|
|
|
device = dasd_device_from_cdev_locked(cdev);
|
|
if (IS_ERR(device))
|
|
return 0;
|
|
ret = 0;
|
|
switch (event) {
|
|
case CIO_GONE:
|
|
case CIO_BOXED:
|
|
case CIO_NO_PATH:
|
|
dasd_path_no_path(device);
|
|
ret = dasd_generic_last_path_gone(device);
|
|
break;
|
|
case CIO_OPER:
|
|
ret = 1;
|
|
if (dasd_path_get_opm(device))
|
|
ret = dasd_generic_path_operational(device);
|
|
break;
|
|
}
|
|
dasd_put_device(device);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_notify);
|
|
|
|
void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
|
|
{
|
|
struct dasd_device *device;
|
|
int chp, oldopm, hpfpm, ifccpm;
|
|
|
|
device = dasd_device_from_cdev_locked(cdev);
|
|
if (IS_ERR(device))
|
|
return;
|
|
|
|
oldopm = dasd_path_get_opm(device);
|
|
for (chp = 0; chp < 8; chp++) {
|
|
if (path_event[chp] & PE_PATH_GONE) {
|
|
dasd_path_notoper(device, chp);
|
|
}
|
|
if (path_event[chp] & PE_PATH_AVAILABLE) {
|
|
dasd_path_available(device, chp);
|
|
dasd_schedule_device_bh(device);
|
|
}
|
|
if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
|
|
if (!dasd_path_is_operational(device, chp) &&
|
|
!dasd_path_need_verify(device, chp)) {
|
|
/*
|
|
* we can not establish a pathgroup on an
|
|
* unavailable path, so trigger a path
|
|
* verification first
|
|
*/
|
|
dasd_path_available(device, chp);
|
|
dasd_schedule_device_bh(device);
|
|
}
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
"Pathgroup re-established\n");
|
|
if (device->discipline->kick_validate)
|
|
device->discipline->kick_validate(device);
|
|
}
|
|
}
|
|
hpfpm = dasd_path_get_hpfpm(device);
|
|
ifccpm = dasd_path_get_ifccpm(device);
|
|
if (!dasd_path_get_opm(device) && hpfpm) {
|
|
/*
|
|
* device has no operational paths but at least one path is
|
|
* disabled due to HPF errors
|
|
* disable HPF at all and use the path(s) again
|
|
*/
|
|
if (device->discipline->disable_hpf)
|
|
device->discipline->disable_hpf(device);
|
|
dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
|
|
dasd_path_set_tbvpm(device, hpfpm);
|
|
dasd_schedule_device_bh(device);
|
|
dasd_schedule_requeue(device);
|
|
} else if (!dasd_path_get_opm(device) && ifccpm) {
|
|
/*
|
|
* device has no operational paths but at least one path is
|
|
* disabled due to IFCC errors
|
|
* trigger path verification on paths with IFCC errors
|
|
*/
|
|
dasd_path_set_tbvpm(device, ifccpm);
|
|
dasd_schedule_device_bh(device);
|
|
}
|
|
if (oldopm && !dasd_path_get_opm(device) && !hpfpm && !ifccpm) {
|
|
dev_warn(&device->cdev->dev,
|
|
"No verified channel paths remain for the device\n");
|
|
DBF_DEV_EVENT(DBF_WARNING, device,
|
|
"%s", "last verified path gone");
|
|
dasd_eer_write(device, NULL, DASD_EER_NOPATH);
|
|
dasd_device_set_stop_bits(device,
|
|
DASD_STOPPED_DC_WAIT);
|
|
}
|
|
dasd_put_device(device);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_path_event);
|
|
|
|
int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
|
|
{
|
|
if (!dasd_path_get_opm(device) && lpm) {
|
|
dasd_path_set_opm(device, lpm);
|
|
dasd_generic_path_operational(device);
|
|
} else
|
|
dasd_path_add_opm(device, lpm);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
|
|
|
|
/*
|
|
* clear active requests and requeue them to block layer if possible
|
|
*/
|
|
static int dasd_generic_requeue_all_requests(struct dasd_device *device)
|
|
{
|
|
struct list_head requeue_queue;
|
|
struct dasd_ccw_req *cqr, *n;
|
|
struct dasd_ccw_req *refers;
|
|
int rc;
|
|
|
|
INIT_LIST_HEAD(&requeue_queue);
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
rc = 0;
|
|
list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
|
|
/* Check status and move request to flush_queue */
|
|
if (cqr->status == DASD_CQR_IN_IO) {
|
|
rc = device->discipline->term_IO(cqr);
|
|
if (rc) {
|
|
/* unable to terminate requeust */
|
|
dev_err(&device->cdev->dev,
|
|
"Unable to terminate request %p "
|
|
"on suspend\n", cqr);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
dasd_put_device(device);
|
|
return rc;
|
|
}
|
|
}
|
|
list_move_tail(&cqr->devlist, &requeue_queue);
|
|
}
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
|
|
list_for_each_entry_safe(cqr, n, &requeue_queue, devlist) {
|
|
wait_event(dasd_flush_wq,
|
|
(cqr->status != DASD_CQR_CLEAR_PENDING));
|
|
|
|
/*
|
|
* requeue requests to blocklayer will only work
|
|
* for block device requests
|
|
*/
|
|
if (_dasd_requeue_request(cqr))
|
|
continue;
|
|
|
|
/* remove requests from device and block queue */
|
|
list_del_init(&cqr->devlist);
|
|
while (cqr->refers != NULL) {
|
|
refers = cqr->refers;
|
|
/* remove the request from the block queue */
|
|
list_del(&cqr->blocklist);
|
|
/* free the finished erp request */
|
|
dasd_free_erp_request(cqr, cqr->memdev);
|
|
cqr = refers;
|
|
}
|
|
|
|
/*
|
|
* _dasd_requeue_request already checked for a valid
|
|
* blockdevice, no need to check again
|
|
* all erp requests (cqr->refers) have a cqr->block
|
|
* pointer copy from the original cqr
|
|
*/
|
|
list_del_init(&cqr->blocklist);
|
|
cqr->block->base->discipline->free_cp(
|
|
cqr, (struct request *) cqr->callback_data);
|
|
}
|
|
|
|
/*
|
|
* if requests remain then they are internal request
|
|
* and go back to the device queue
|
|
*/
|
|
if (!list_empty(&requeue_queue)) {
|
|
/* move freeze_queue to start of the ccw_queue */
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
list_splice_tail(&requeue_queue, &device->ccw_queue);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
}
|
|
dasd_schedule_device_bh(device);
|
|
return rc;
|
|
}
|
|
|
|
static void do_requeue_requests(struct work_struct *work)
|
|
{
|
|
struct dasd_device *device = container_of(work, struct dasd_device,
|
|
requeue_requests);
|
|
dasd_generic_requeue_all_requests(device);
|
|
dasd_device_remove_stop_bits(device, DASD_STOPPED_NOT_ACC);
|
|
if (device->block)
|
|
dasd_schedule_block_bh(device->block);
|
|
dasd_put_device(device);
|
|
}
|
|
|
|
void dasd_schedule_requeue(struct dasd_device *device)
|
|
{
|
|
dasd_get_device(device);
|
|
/* queue call to dasd_reload_device to the kernel event daemon. */
|
|
if (!schedule_work(&device->requeue_requests))
|
|
dasd_put_device(device);
|
|
}
|
|
EXPORT_SYMBOL(dasd_schedule_requeue);
|
|
|
|
int dasd_generic_pm_freeze(struct ccw_device *cdev)
|
|
{
|
|
struct dasd_device *device = dasd_device_from_cdev(cdev);
|
|
|
|
if (IS_ERR(device))
|
|
return PTR_ERR(device);
|
|
|
|
/* mark device as suspended */
|
|
set_bit(DASD_FLAG_SUSPENDED, &device->flags);
|
|
|
|
if (device->discipline->freeze)
|
|
device->discipline->freeze(device);
|
|
|
|
/* disallow new I/O */
|
|
dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
|
|
|
|
return dasd_generic_requeue_all_requests(device);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
|
|
|
|
int dasd_generic_restore_device(struct ccw_device *cdev)
|
|
{
|
|
struct dasd_device *device = dasd_device_from_cdev(cdev);
|
|
int rc = 0;
|
|
|
|
if (IS_ERR(device))
|
|
return PTR_ERR(device);
|
|
|
|
/* allow new IO again */
|
|
dasd_device_remove_stop_bits(device,
|
|
(DASD_STOPPED_PM | DASD_UNRESUMED_PM));
|
|
|
|
dasd_schedule_device_bh(device);
|
|
|
|
/*
|
|
* call discipline restore function
|
|
* if device is stopped do nothing e.g. for disconnected devices
|
|
*/
|
|
if (device->discipline->restore && !(device->stopped))
|
|
rc = device->discipline->restore(device);
|
|
if (rc || device->stopped)
|
|
/*
|
|
* if the resume failed for the DASD we put it in
|
|
* an UNRESUMED stop state
|
|
*/
|
|
device->stopped |= DASD_UNRESUMED_PM;
|
|
|
|
if (device->block) {
|
|
dasd_schedule_block_bh(device->block);
|
|
if (device->block->request_queue)
|
|
blk_mq_run_hw_queues(device->block->request_queue,
|
|
true);
|
|
}
|
|
|
|
clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
|
|
dasd_put_device(device);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
|
|
|
|
static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
|
|
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,
|
|
NULL);
|
|
|
|
if (IS_ERR(cqr)) {
|
|
/* internal error 13 - Allocating the RDC request failed*/
|
|
dev_err(&device->cdev->dev,
|
|
"An error occurred in the DASD device driver, "
|
|
"reason=%s\n", "13");
|
|
return cqr;
|
|
}
|
|
|
|
ccw = cqr->cpaddr;
|
|
ccw->cmd_code = CCW_CMD_RDC;
|
|
if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
|
|
idaw = (unsigned long *) (cqr->data);
|
|
ccw->cda = (__u32)(addr_t) idaw;
|
|
ccw->flags = CCW_FLAG_IDA;
|
|
idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
|
|
} else {
|
|
ccw->cda = (__u32)(addr_t) rdc_buffer;
|
|
ccw->flags = 0;
|
|
}
|
|
|
|
ccw->count = rdc_buffer_size;
|
|
cqr->startdev = device;
|
|
cqr->memdev = device;
|
|
cqr->expires = 10*HZ;
|
|
cqr->retries = 256;
|
|
cqr->buildclk = get_tod_clock();
|
|
cqr->status = DASD_CQR_FILLED;
|
|
return cqr;
|
|
}
|
|
|
|
|
|
int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
|
|
void *rdc_buffer, int rdc_buffer_size)
|
|
{
|
|
int ret;
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
|
|
magic);
|
|
if (IS_ERR(cqr))
|
|
return PTR_ERR(cqr);
|
|
|
|
ret = dasd_sleep_on(cqr);
|
|
dasd_sfree_request(cqr, cqr->memdev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
|
|
|
|
/*
|
|
* In command mode and transport mode we need to look for sense
|
|
* data in different places. The sense data itself is allways
|
|
* an array of 32 bytes, so we can unify the sense data access
|
|
* for both modes.
|
|
*/
|
|
char *dasd_get_sense(struct irb *irb)
|
|
{
|
|
struct tsb *tsb = NULL;
|
|
char *sense = NULL;
|
|
|
|
if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
|
|
if (irb->scsw.tm.tcw)
|
|
tsb = tcw_get_tsb((struct tcw *)(unsigned long)
|
|
irb->scsw.tm.tcw);
|
|
if (tsb && tsb->length == 64 && tsb->flags)
|
|
switch (tsb->flags & 0x07) {
|
|
case 1: /* tsa_iostat */
|
|
sense = tsb->tsa.iostat.sense;
|
|
break;
|
|
case 2: /* tsa_ddpc */
|
|
sense = tsb->tsa.ddpc.sense;
|
|
break;
|
|
default:
|
|
/* currently we don't use interrogate data */
|
|
break;
|
|
}
|
|
} else if (irb->esw.esw0.erw.cons) {
|
|
sense = irb->ecw;
|
|
}
|
|
return sense;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_get_sense);
|
|
|
|
void dasd_generic_shutdown(struct ccw_device *cdev)
|
|
{
|
|
struct dasd_device *device;
|
|
|
|
device = dasd_device_from_cdev(cdev);
|
|
if (IS_ERR(device))
|
|
return;
|
|
|
|
if (device->block)
|
|
dasd_schedule_block_bh(device->block);
|
|
|
|
dasd_schedule_device_bh(device);
|
|
|
|
wait_event(shutdown_waitq, _wait_for_empty_queues(device));
|
|
}
|
|
EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
|
|
|
|
static int __init dasd_init(void)
|
|
{
|
|
int rc;
|
|
|
|
init_waitqueue_head(&dasd_init_waitq);
|
|
init_waitqueue_head(&dasd_flush_wq);
|
|
init_waitqueue_head(&generic_waitq);
|
|
init_waitqueue_head(&shutdown_waitq);
|
|
|
|
/* register 'common' DASD debug area, used for all DBF_XXX calls */
|
|
dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
|
|
if (dasd_debug_area == NULL) {
|
|
rc = -ENOMEM;
|
|
goto failed;
|
|
}
|
|
debug_register_view(dasd_debug_area, &debug_sprintf_view);
|
|
debug_set_level(dasd_debug_area, DBF_WARNING);
|
|
|
|
DBF_EVENT(DBF_EMERG, "%s", "debug area created");
|
|
|
|
dasd_diag_discipline_pointer = NULL;
|
|
|
|
dasd_statistics_createroot();
|
|
|
|
rc = dasd_devmap_init();
|
|
if (rc)
|
|
goto failed;
|
|
rc = dasd_gendisk_init();
|
|
if (rc)
|
|
goto failed;
|
|
rc = dasd_parse();
|
|
if (rc)
|
|
goto failed;
|
|
rc = dasd_eer_init();
|
|
if (rc)
|
|
goto failed;
|
|
#ifdef CONFIG_PROC_FS
|
|
rc = dasd_proc_init();
|
|
if (rc)
|
|
goto failed;
|
|
#endif
|
|
|
|
return 0;
|
|
failed:
|
|
pr_info("The DASD device driver could not be initialized\n");
|
|
dasd_exit();
|
|
return rc;
|
|
}
|
|
|
|
module_init(dasd_init);
|
|
module_exit(dasd_exit);
|