2008-01-26 06:11:23 -07:00
|
|
|
/*
|
|
|
|
* PAV alias management for the DASD ECKD discipline
|
|
|
|
*
|
|
|
|
* Copyright IBM Corporation, 2007
|
|
|
|
* Author(s): Stefan Weinhuber <wein@de.ibm.com>
|
|
|
|
*/
|
|
|
|
|
2009-09-11 02:28:30 -06:00
|
|
|
#define KMSG_COMPONENT "dasd-eckd"
|
2009-03-26 08:23:49 -06:00
|
|
|
|
2008-01-26 06:11:23 -07:00
|
|
|
#include <linux/list.h>
|
|
|
|
#include <asm/ebcdic.h>
|
|
|
|
#include "dasd_int.h"
|
|
|
|
#include "dasd_eckd.h"
|
|
|
|
|
|
|
|
#ifdef PRINTK_HEADER
|
|
|
|
#undef PRINTK_HEADER
|
|
|
|
#endif /* PRINTK_HEADER */
|
|
|
|
#define PRINTK_HEADER "dasd(eckd):"
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* General concept of alias management:
|
|
|
|
* - PAV and DASD alias management is specific to the eckd discipline.
|
|
|
|
* - A device is connected to an lcu as long as the device exists.
|
|
|
|
* dasd_alias_make_device_known_to_lcu will be called wenn the
|
|
|
|
* device is checked by the eckd discipline and
|
|
|
|
* dasd_alias_disconnect_device_from_lcu will be called
|
|
|
|
* before the device is deleted.
|
|
|
|
* - The dasd_alias_add_device / dasd_alias_remove_device
|
|
|
|
* functions mark the point when a device is 'ready for service'.
|
|
|
|
* - A summary unit check is a rare occasion, but it is mandatory to
|
|
|
|
* support it. It requires some complex recovery actions before the
|
|
|
|
* devices can be used again (see dasd_alias_handle_summary_unit_check).
|
|
|
|
* - dasd_alias_get_start_dev will find an alias device that can be used
|
|
|
|
* instead of the base device and does some (very simple) load balancing.
|
|
|
|
* This is the function that gets called for each I/O, so when improving
|
|
|
|
* something, this function should get faster or better, the rest has just
|
|
|
|
* to be correct.
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
static void summary_unit_check_handling_work(struct work_struct *);
|
|
|
|
static void lcu_update_work(struct work_struct *);
|
|
|
|
static int _schedule_lcu_update(struct alias_lcu *, struct dasd_device *);
|
|
|
|
|
|
|
|
static struct alias_root aliastree = {
|
|
|
|
.serverlist = LIST_HEAD_INIT(aliastree.serverlist),
|
|
|
|
.lock = __SPIN_LOCK_UNLOCKED(aliastree.lock),
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct alias_server *_find_server(struct dasd_uid *uid)
|
|
|
|
{
|
|
|
|
struct alias_server *pos;
|
|
|
|
list_for_each_entry(pos, &aliastree.serverlist, server) {
|
|
|
|
if (!strncmp(pos->uid.vendor, uid->vendor,
|
|
|
|
sizeof(uid->vendor))
|
|
|
|
&& !strncmp(pos->uid.serial, uid->serial,
|
|
|
|
sizeof(uid->serial)))
|
|
|
|
return pos;
|
|
|
|
};
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct alias_lcu *_find_lcu(struct alias_server *server,
|
|
|
|
struct dasd_uid *uid)
|
|
|
|
{
|
|
|
|
struct alias_lcu *pos;
|
|
|
|
list_for_each_entry(pos, &server->lculist, lcu) {
|
|
|
|
if (pos->uid.ssid == uid->ssid)
|
|
|
|
return pos;
|
|
|
|
};
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct alias_pav_group *_find_group(struct alias_lcu *lcu,
|
|
|
|
struct dasd_uid *uid)
|
|
|
|
{
|
|
|
|
struct alias_pav_group *pos;
|
|
|
|
__u8 search_unit_addr;
|
|
|
|
|
|
|
|
/* for hyper pav there is only one group */
|
|
|
|
if (lcu->pav == HYPER_PAV) {
|
|
|
|
if (list_empty(&lcu->grouplist))
|
|
|
|
return NULL;
|
|
|
|
else
|
|
|
|
return list_first_entry(&lcu->grouplist,
|
|
|
|
struct alias_pav_group, group);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* for base pav we have to find the group that matches the base */
|
|
|
|
if (uid->type == UA_BASE_DEVICE)
|
|
|
|
search_unit_addr = uid->real_unit_addr;
|
|
|
|
else
|
|
|
|
search_unit_addr = uid->base_unit_addr;
|
|
|
|
list_for_each_entry(pos, &lcu->grouplist, group) {
|
2008-08-01 08:39:09 -06:00
|
|
|
if (pos->uid.base_unit_addr == search_unit_addr &&
|
|
|
|
!strncmp(pos->uid.vduit, uid->vduit, sizeof(uid->vduit)))
|
2008-01-26 06:11:23 -07:00
|
|
|
return pos;
|
|
|
|
};
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct alias_server *_allocate_server(struct dasd_uid *uid)
|
|
|
|
{
|
|
|
|
struct alias_server *server;
|
|
|
|
|
|
|
|
server = kzalloc(sizeof(*server), GFP_KERNEL);
|
|
|
|
if (!server)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
memcpy(server->uid.vendor, uid->vendor, sizeof(uid->vendor));
|
|
|
|
memcpy(server->uid.serial, uid->serial, sizeof(uid->serial));
|
|
|
|
INIT_LIST_HEAD(&server->server);
|
|
|
|
INIT_LIST_HEAD(&server->lculist);
|
|
|
|
return server;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void _free_server(struct alias_server *server)
|
|
|
|
{
|
|
|
|
kfree(server);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct alias_lcu *_allocate_lcu(struct dasd_uid *uid)
|
|
|
|
{
|
|
|
|
struct alias_lcu *lcu;
|
|
|
|
|
|
|
|
lcu = kzalloc(sizeof(*lcu), GFP_KERNEL);
|
|
|
|
if (!lcu)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
lcu->uac = kzalloc(sizeof(*(lcu->uac)), GFP_KERNEL | GFP_DMA);
|
|
|
|
if (!lcu->uac)
|
|
|
|
goto out_err1;
|
|
|
|
lcu->rsu_cqr = kzalloc(sizeof(*lcu->rsu_cqr), GFP_KERNEL | GFP_DMA);
|
|
|
|
if (!lcu->rsu_cqr)
|
|
|
|
goto out_err2;
|
|
|
|
lcu->rsu_cqr->cpaddr = kzalloc(sizeof(struct ccw1),
|
|
|
|
GFP_KERNEL | GFP_DMA);
|
|
|
|
if (!lcu->rsu_cqr->cpaddr)
|
|
|
|
goto out_err3;
|
|
|
|
lcu->rsu_cqr->data = kzalloc(16, GFP_KERNEL | GFP_DMA);
|
|
|
|
if (!lcu->rsu_cqr->data)
|
|
|
|
goto out_err4;
|
|
|
|
|
|
|
|
memcpy(lcu->uid.vendor, uid->vendor, sizeof(uid->vendor));
|
|
|
|
memcpy(lcu->uid.serial, uid->serial, sizeof(uid->serial));
|
|
|
|
lcu->uid.ssid = uid->ssid;
|
|
|
|
lcu->pav = NO_PAV;
|
|
|
|
lcu->flags = NEED_UAC_UPDATE | UPDATE_PENDING;
|
|
|
|
INIT_LIST_HEAD(&lcu->lcu);
|
|
|
|
INIT_LIST_HEAD(&lcu->inactive_devices);
|
|
|
|
INIT_LIST_HEAD(&lcu->active_devices);
|
|
|
|
INIT_LIST_HEAD(&lcu->grouplist);
|
|
|
|
INIT_WORK(&lcu->suc_data.worker, summary_unit_check_handling_work);
|
|
|
|
INIT_DELAYED_WORK(&lcu->ruac_data.dwork, lcu_update_work);
|
|
|
|
spin_lock_init(&lcu->lock);
|
2009-12-07 04:51:53 -07:00
|
|
|
init_completion(&lcu->lcu_setup);
|
2008-01-26 06:11:23 -07:00
|
|
|
return lcu;
|
|
|
|
|
|
|
|
out_err4:
|
|
|
|
kfree(lcu->rsu_cqr->cpaddr);
|
|
|
|
out_err3:
|
|
|
|
kfree(lcu->rsu_cqr);
|
|
|
|
out_err2:
|
|
|
|
kfree(lcu->uac);
|
|
|
|
out_err1:
|
|
|
|
kfree(lcu);
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void _free_lcu(struct alias_lcu *lcu)
|
|
|
|
{
|
|
|
|
kfree(lcu->rsu_cqr->data);
|
|
|
|
kfree(lcu->rsu_cqr->cpaddr);
|
|
|
|
kfree(lcu->rsu_cqr);
|
|
|
|
kfree(lcu->uac);
|
|
|
|
kfree(lcu);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This is the function that will allocate all the server and lcu data,
|
|
|
|
* so this function must be called first for a new device.
|
|
|
|
* If the return value is 1, the lcu was already known before, if it
|
|
|
|
* is 0, this is a new lcu.
|
|
|
|
* Negative return code indicates that something went wrong (e.g. -ENOMEM)
|
|
|
|
*/
|
|
|
|
int dasd_alias_make_device_known_to_lcu(struct dasd_device *device)
|
|
|
|
{
|
|
|
|
struct dasd_eckd_private *private;
|
|
|
|
unsigned long flags;
|
|
|
|
struct alias_server *server, *newserver;
|
|
|
|
struct alias_lcu *lcu, *newlcu;
|
|
|
|
int is_lcu_known;
|
|
|
|
struct dasd_uid *uid;
|
|
|
|
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
uid = &private->uid;
|
|
|
|
spin_lock_irqsave(&aliastree.lock, flags);
|
|
|
|
is_lcu_known = 1;
|
|
|
|
server = _find_server(uid);
|
|
|
|
if (!server) {
|
|
|
|
spin_unlock_irqrestore(&aliastree.lock, flags);
|
|
|
|
newserver = _allocate_server(uid);
|
|
|
|
if (IS_ERR(newserver))
|
|
|
|
return PTR_ERR(newserver);
|
|
|
|
spin_lock_irqsave(&aliastree.lock, flags);
|
|
|
|
server = _find_server(uid);
|
|
|
|
if (!server) {
|
|
|
|
list_add(&newserver->server, &aliastree.serverlist);
|
|
|
|
server = newserver;
|
|
|
|
is_lcu_known = 0;
|
|
|
|
} else {
|
|
|
|
/* someone was faster */
|
|
|
|
_free_server(newserver);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
lcu = _find_lcu(server, uid);
|
|
|
|
if (!lcu) {
|
|
|
|
spin_unlock_irqrestore(&aliastree.lock, flags);
|
|
|
|
newlcu = _allocate_lcu(uid);
|
|
|
|
if (IS_ERR(newlcu))
|
2009-12-18 09:43:17 -07:00
|
|
|
return PTR_ERR(newlcu);
|
2008-01-26 06:11:23 -07:00
|
|
|
spin_lock_irqsave(&aliastree.lock, flags);
|
|
|
|
lcu = _find_lcu(server, uid);
|
|
|
|
if (!lcu) {
|
|
|
|
list_add(&newlcu->lcu, &server->lculist);
|
|
|
|
lcu = newlcu;
|
|
|
|
is_lcu_known = 0;
|
|
|
|
} else {
|
|
|
|
/* someone was faster */
|
|
|
|
_free_lcu(newlcu);
|
|
|
|
}
|
|
|
|
is_lcu_known = 0;
|
|
|
|
}
|
|
|
|
spin_lock(&lcu->lock);
|
|
|
|
list_add(&device->alias_list, &lcu->inactive_devices);
|
|
|
|
private->lcu = lcu;
|
|
|
|
spin_unlock(&lcu->lock);
|
|
|
|
spin_unlock_irqrestore(&aliastree.lock, flags);
|
|
|
|
|
|
|
|
return is_lcu_known;
|
|
|
|
}
|
|
|
|
|
2009-12-07 04:51:53 -07:00
|
|
|
/*
|
|
|
|
* The first device to be registered on an LCU will have to do
|
|
|
|
* some additional setup steps to configure that LCU on the
|
|
|
|
* storage server. All further devices should wait with their
|
|
|
|
* initialization until the first device is done.
|
|
|
|
* To synchronize this work, the first device will call
|
|
|
|
* dasd_alias_lcu_setup_complete when it is done, and all
|
|
|
|
* other devices will wait for it with dasd_alias_wait_for_lcu_setup.
|
|
|
|
*/
|
|
|
|
void dasd_alias_lcu_setup_complete(struct dasd_device *device)
|
|
|
|
{
|
|
|
|
struct dasd_eckd_private *private;
|
|
|
|
unsigned long flags;
|
|
|
|
struct alias_server *server;
|
|
|
|
struct alias_lcu *lcu;
|
|
|
|
struct dasd_uid *uid;
|
|
|
|
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
uid = &private->uid;
|
|
|
|
lcu = NULL;
|
|
|
|
spin_lock_irqsave(&aliastree.lock, flags);
|
|
|
|
server = _find_server(uid);
|
|
|
|
if (server)
|
|
|
|
lcu = _find_lcu(server, uid);
|
|
|
|
spin_unlock_irqrestore(&aliastree.lock, flags);
|
|
|
|
if (!lcu) {
|
|
|
|
DBF_EVENT_DEVID(DBF_ERR, device->cdev,
|
|
|
|
"could not find lcu for %04x %02x",
|
|
|
|
uid->ssid, uid->real_unit_addr);
|
|
|
|
WARN_ON(1);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
complete_all(&lcu->lcu_setup);
|
|
|
|
}
|
|
|
|
|
|
|
|
void dasd_alias_wait_for_lcu_setup(struct dasd_device *device)
|
|
|
|
{
|
|
|
|
struct dasd_eckd_private *private;
|
|
|
|
unsigned long flags;
|
|
|
|
struct alias_server *server;
|
|
|
|
struct alias_lcu *lcu;
|
|
|
|
struct dasd_uid *uid;
|
|
|
|
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
uid = &private->uid;
|
|
|
|
lcu = NULL;
|
|
|
|
spin_lock_irqsave(&aliastree.lock, flags);
|
|
|
|
server = _find_server(uid);
|
|
|
|
if (server)
|
|
|
|
lcu = _find_lcu(server, uid);
|
|
|
|
spin_unlock_irqrestore(&aliastree.lock, flags);
|
|
|
|
if (!lcu) {
|
|
|
|
DBF_EVENT_DEVID(DBF_ERR, device->cdev,
|
|
|
|
"could not find lcu for %04x %02x",
|
|
|
|
uid->ssid, uid->real_unit_addr);
|
|
|
|
WARN_ON(1);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
wait_for_completion(&lcu->lcu_setup);
|
|
|
|
}
|
|
|
|
|
2008-01-26 06:11:23 -07:00
|
|
|
/*
|
|
|
|
* This function removes a device from the scope of alias management.
|
|
|
|
* The complicated part is to make sure that it is not in use by
|
|
|
|
* any of the workers. If necessary cancel the work.
|
|
|
|
*/
|
|
|
|
void dasd_alias_disconnect_device_from_lcu(struct dasd_device *device)
|
|
|
|
{
|
|
|
|
struct dasd_eckd_private *private;
|
|
|
|
unsigned long flags;
|
|
|
|
struct alias_lcu *lcu;
|
|
|
|
struct alias_server *server;
|
|
|
|
int was_pending;
|
|
|
|
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
lcu = private->lcu;
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
list_del_init(&device->alias_list);
|
|
|
|
/* make sure that the workers don't use this device */
|
|
|
|
if (device == lcu->suc_data.device) {
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
cancel_work_sync(&lcu->suc_data.worker);
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
if (device == lcu->suc_data.device)
|
|
|
|
lcu->suc_data.device = NULL;
|
|
|
|
}
|
|
|
|
was_pending = 0;
|
|
|
|
if (device == lcu->ruac_data.device) {
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
was_pending = 1;
|
|
|
|
cancel_delayed_work_sync(&lcu->ruac_data.dwork);
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
if (device == lcu->ruac_data.device)
|
|
|
|
lcu->ruac_data.device = NULL;
|
|
|
|
}
|
|
|
|
private->lcu = NULL;
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
|
|
|
|
spin_lock_irqsave(&aliastree.lock, flags);
|
|
|
|
spin_lock(&lcu->lock);
|
|
|
|
if (list_empty(&lcu->grouplist) &&
|
|
|
|
list_empty(&lcu->active_devices) &&
|
|
|
|
list_empty(&lcu->inactive_devices)) {
|
|
|
|
list_del(&lcu->lcu);
|
|
|
|
spin_unlock(&lcu->lock);
|
|
|
|
_free_lcu(lcu);
|
|
|
|
lcu = NULL;
|
|
|
|
} else {
|
|
|
|
if (was_pending)
|
|
|
|
_schedule_lcu_update(lcu, NULL);
|
|
|
|
spin_unlock(&lcu->lock);
|
|
|
|
}
|
|
|
|
server = _find_server(&private->uid);
|
|
|
|
if (server && list_empty(&server->lculist)) {
|
|
|
|
list_del(&server->server);
|
|
|
|
_free_server(server);
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&aliastree.lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This function assumes that the unit address configuration stored
|
|
|
|
* in the lcu is up to date and will update the device uid before
|
|
|
|
* adding it to a pav group.
|
|
|
|
*/
|
|
|
|
static int _add_device_to_lcu(struct alias_lcu *lcu,
|
|
|
|
struct dasd_device *device)
|
|
|
|
{
|
|
|
|
|
|
|
|
struct dasd_eckd_private *private;
|
|
|
|
struct alias_pav_group *group;
|
|
|
|
struct dasd_uid *uid;
|
|
|
|
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
uid = &private->uid;
|
|
|
|
uid->type = lcu->uac->unit[uid->real_unit_addr].ua_type;
|
|
|
|
uid->base_unit_addr = lcu->uac->unit[uid->real_unit_addr].base_ua;
|
|
|
|
dasd_set_uid(device->cdev, &private->uid);
|
|
|
|
|
|
|
|
/* if we have no PAV anyway, we don't need to bother with PAV groups */
|
|
|
|
if (lcu->pav == NO_PAV) {
|
|
|
|
list_move(&device->alias_list, &lcu->active_devices);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
group = _find_group(lcu, uid);
|
|
|
|
if (!group) {
|
|
|
|
group = kzalloc(sizeof(*group), GFP_ATOMIC);
|
|
|
|
if (!group)
|
|
|
|
return -ENOMEM;
|
|
|
|
memcpy(group->uid.vendor, uid->vendor, sizeof(uid->vendor));
|
|
|
|
memcpy(group->uid.serial, uid->serial, sizeof(uid->serial));
|
|
|
|
group->uid.ssid = uid->ssid;
|
|
|
|
if (uid->type == UA_BASE_DEVICE)
|
|
|
|
group->uid.base_unit_addr = uid->real_unit_addr;
|
|
|
|
else
|
|
|
|
group->uid.base_unit_addr = uid->base_unit_addr;
|
2008-08-01 08:39:09 -06:00
|
|
|
memcpy(group->uid.vduit, uid->vduit, sizeof(uid->vduit));
|
2008-01-26 06:11:23 -07:00
|
|
|
INIT_LIST_HEAD(&group->group);
|
|
|
|
INIT_LIST_HEAD(&group->baselist);
|
|
|
|
INIT_LIST_HEAD(&group->aliaslist);
|
|
|
|
list_add(&group->group, &lcu->grouplist);
|
|
|
|
}
|
|
|
|
if (uid->type == UA_BASE_DEVICE)
|
|
|
|
list_move(&device->alias_list, &group->baselist);
|
|
|
|
else
|
|
|
|
list_move(&device->alias_list, &group->aliaslist);
|
|
|
|
private->pavgroup = group;
|
|
|
|
return 0;
|
|
|
|
};
|
|
|
|
|
|
|
|
static void _remove_device_from_lcu(struct alias_lcu *lcu,
|
|
|
|
struct dasd_device *device)
|
|
|
|
{
|
|
|
|
struct dasd_eckd_private *private;
|
|
|
|
struct alias_pav_group *group;
|
|
|
|
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
list_move(&device->alias_list, &lcu->inactive_devices);
|
|
|
|
group = private->pavgroup;
|
|
|
|
if (!group)
|
|
|
|
return;
|
|
|
|
private->pavgroup = NULL;
|
|
|
|
if (list_empty(&group->baselist) && list_empty(&group->aliaslist)) {
|
|
|
|
list_del(&group->group);
|
|
|
|
kfree(group);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (group->next == device)
|
|
|
|
group->next = NULL;
|
|
|
|
};
|
|
|
|
|
|
|
|
static int read_unit_address_configuration(struct dasd_device *device,
|
|
|
|
struct alias_lcu *lcu)
|
|
|
|
{
|
|
|
|
struct dasd_psf_prssd_data *prssdp;
|
|
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
struct ccw1 *ccw;
|
|
|
|
int rc;
|
|
|
|
unsigned long flags;
|
|
|
|
|
2009-09-11 02:28:29 -06:00
|
|
|
cqr = dasd_kmalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
|
2008-01-26 06:11:23 -07:00
|
|
|
(sizeof(struct dasd_psf_prssd_data)),
|
|
|
|
device);
|
|
|
|
if (IS_ERR(cqr))
|
|
|
|
return PTR_ERR(cqr);
|
|
|
|
cqr->startdev = device;
|
|
|
|
cqr->memdev = device;
|
|
|
|
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
|
|
|
|
cqr->retries = 10;
|
|
|
|
cqr->expires = 20 * HZ;
|
|
|
|
|
|
|
|
/* Prepare for Read Subsystem Data */
|
|
|
|
prssdp = (struct dasd_psf_prssd_data *) cqr->data;
|
|
|
|
memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
|
|
|
|
prssdp->order = PSF_ORDER_PRSSD;
|
|
|
|
prssdp->suborder = 0x0e; /* Read unit address configuration */
|
|
|
|
/* all other bytes of prssdp must be zero */
|
|
|
|
|
|
|
|
ccw = cqr->cpaddr;
|
|
|
|
ccw->cmd_code = DASD_ECKD_CCW_PSF;
|
|
|
|
ccw->count = sizeof(struct dasd_psf_prssd_data);
|
|
|
|
ccw->flags |= CCW_FLAG_CC;
|
|
|
|
ccw->cda = (__u32)(addr_t) prssdp;
|
|
|
|
|
|
|
|
/* Read Subsystem Data - feature codes */
|
|
|
|
memset(lcu->uac, 0, sizeof(*(lcu->uac)));
|
|
|
|
|
|
|
|
ccw++;
|
|
|
|
ccw->cmd_code = DASD_ECKD_CCW_RSSD;
|
|
|
|
ccw->count = sizeof(*(lcu->uac));
|
|
|
|
ccw->cda = (__u32)(addr_t) lcu->uac;
|
|
|
|
|
|
|
|
cqr->buildclk = get_clock();
|
|
|
|
cqr->status = DASD_CQR_FILLED;
|
|
|
|
|
|
|
|
/* need to unset flag here to detect race with summary unit check */
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
lcu->flags &= ~NEED_UAC_UPDATE;
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
|
|
|
|
do {
|
|
|
|
rc = dasd_sleep_on(cqr);
|
|
|
|
} while (rc && (cqr->retries > 0));
|
|
|
|
if (rc) {
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
lcu->flags |= NEED_UAC_UPDATE;
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
}
|
|
|
|
dasd_kfree_request(cqr, cqr->memdev);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int _lcu_update(struct dasd_device *refdev, struct alias_lcu *lcu)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
struct alias_pav_group *pavgroup, *tempgroup;
|
|
|
|
struct dasd_device *device, *tempdev;
|
|
|
|
int i, rc;
|
|
|
|
struct dasd_eckd_private *private;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
list_for_each_entry_safe(pavgroup, tempgroup, &lcu->grouplist, group) {
|
|
|
|
list_for_each_entry_safe(device, tempdev, &pavgroup->baselist,
|
|
|
|
alias_list) {
|
|
|
|
list_move(&device->alias_list, &lcu->active_devices);
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
private->pavgroup = NULL;
|
|
|
|
}
|
|
|
|
list_for_each_entry_safe(device, tempdev, &pavgroup->aliaslist,
|
|
|
|
alias_list) {
|
|
|
|
list_move(&device->alias_list, &lcu->active_devices);
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
private->pavgroup = NULL;
|
|
|
|
}
|
|
|
|
list_del(&pavgroup->group);
|
|
|
|
kfree(pavgroup);
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
|
|
|
|
rc = read_unit_address_configuration(refdev, lcu);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
lcu->pav = NO_PAV;
|
|
|
|
for (i = 0; i < MAX_DEVICES_PER_LCU; ++i) {
|
|
|
|
switch (lcu->uac->unit[i].ua_type) {
|
|
|
|
case UA_BASE_PAV_ALIAS:
|
|
|
|
lcu->pav = BASE_PAV;
|
|
|
|
break;
|
|
|
|
case UA_HYPER_PAV_ALIAS:
|
|
|
|
lcu->pav = HYPER_PAV;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (lcu->pav != NO_PAV)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
list_for_each_entry_safe(device, tempdev, &lcu->active_devices,
|
|
|
|
alias_list) {
|
|
|
|
_add_device_to_lcu(lcu, device);
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void lcu_update_work(struct work_struct *work)
|
|
|
|
{
|
|
|
|
struct alias_lcu *lcu;
|
|
|
|
struct read_uac_work_data *ruac_data;
|
|
|
|
struct dasd_device *device;
|
|
|
|
unsigned long flags;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
ruac_data = container_of(work, struct read_uac_work_data, dwork.work);
|
|
|
|
lcu = container_of(ruac_data, struct alias_lcu, ruac_data);
|
|
|
|
device = ruac_data->device;
|
|
|
|
rc = _lcu_update(device, lcu);
|
|
|
|
/*
|
|
|
|
* Need to check flags again, as there could have been another
|
|
|
|
* prepare_update or a new device a new device while we were still
|
|
|
|
* processing the data
|
|
|
|
*/
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
if (rc || (lcu->flags & NEED_UAC_UPDATE)) {
|
2009-03-26 08:23:49 -06:00
|
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "could not update"
|
2008-01-26 06:11:23 -07:00
|
|
|
" alias data in lcu (rc = %d), retry later", rc);
|
|
|
|
schedule_delayed_work(&lcu->ruac_data.dwork, 30*HZ);
|
|
|
|
} else {
|
|
|
|
lcu->ruac_data.device = NULL;
|
|
|
|
lcu->flags &= ~UPDATE_PENDING;
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int _schedule_lcu_update(struct alias_lcu *lcu,
|
|
|
|
struct dasd_device *device)
|
|
|
|
{
|
|
|
|
struct dasd_device *usedev = NULL;
|
|
|
|
struct alias_pav_group *group;
|
|
|
|
|
|
|
|
lcu->flags |= NEED_UAC_UPDATE;
|
|
|
|
if (lcu->ruac_data.device) {
|
|
|
|
/* already scheduled or running */
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if (device && !list_empty(&device->alias_list))
|
|
|
|
usedev = device;
|
|
|
|
|
|
|
|
if (!usedev && !list_empty(&lcu->grouplist)) {
|
|
|
|
group = list_first_entry(&lcu->grouplist,
|
|
|
|
struct alias_pav_group, group);
|
|
|
|
if (!list_empty(&group->baselist))
|
|
|
|
usedev = list_first_entry(&group->baselist,
|
|
|
|
struct dasd_device,
|
|
|
|
alias_list);
|
|
|
|
else if (!list_empty(&group->aliaslist))
|
|
|
|
usedev = list_first_entry(&group->aliaslist,
|
|
|
|
struct dasd_device,
|
|
|
|
alias_list);
|
|
|
|
}
|
|
|
|
if (!usedev && !list_empty(&lcu->active_devices)) {
|
|
|
|
usedev = list_first_entry(&lcu->active_devices,
|
|
|
|
struct dasd_device, alias_list);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* if we haven't found a proper device yet, give up for now, the next
|
|
|
|
* device that will be set active will trigger an lcu update
|
|
|
|
*/
|
|
|
|
if (!usedev)
|
|
|
|
return -EINVAL;
|
|
|
|
lcu->ruac_data.device = usedev;
|
|
|
|
schedule_delayed_work(&lcu->ruac_data.dwork, 0);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int dasd_alias_add_device(struct dasd_device *device)
|
|
|
|
{
|
|
|
|
struct dasd_eckd_private *private;
|
|
|
|
struct alias_lcu *lcu;
|
|
|
|
unsigned long flags;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
lcu = private->lcu;
|
|
|
|
rc = 0;
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
if (!(lcu->flags & UPDATE_PENDING)) {
|
|
|
|
rc = _add_device_to_lcu(lcu, device);
|
|
|
|
if (rc)
|
|
|
|
lcu->flags |= UPDATE_PENDING;
|
|
|
|
}
|
|
|
|
if (lcu->flags & UPDATE_PENDING) {
|
|
|
|
list_move(&device->alias_list, &lcu->active_devices);
|
|
|
|
_schedule_lcu_update(lcu, device);
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
int dasd_alias_remove_device(struct dasd_device *device)
|
|
|
|
{
|
|
|
|
struct dasd_eckd_private *private;
|
|
|
|
struct alias_lcu *lcu;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
lcu = private->lcu;
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
_remove_device_from_lcu(lcu, device);
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct dasd_device *dasd_alias_get_start_dev(struct dasd_device *base_device)
|
|
|
|
{
|
|
|
|
|
|
|
|
struct dasd_device *alias_device;
|
|
|
|
struct alias_pav_group *group;
|
|
|
|
struct alias_lcu *lcu;
|
|
|
|
struct dasd_eckd_private *private, *alias_priv;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
private = (struct dasd_eckd_private *) base_device->private;
|
|
|
|
group = private->pavgroup;
|
|
|
|
lcu = private->lcu;
|
|
|
|
if (!group || !lcu)
|
|
|
|
return NULL;
|
|
|
|
if (lcu->pav == NO_PAV ||
|
|
|
|
lcu->flags & (NEED_UAC_UPDATE | UPDATE_PENDING))
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
alias_device = group->next;
|
|
|
|
if (!alias_device) {
|
|
|
|
if (list_empty(&group->aliaslist)) {
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
return NULL;
|
|
|
|
} else {
|
|
|
|
alias_device = list_first_entry(&group->aliaslist,
|
|
|
|
struct dasd_device,
|
|
|
|
alias_list);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (list_is_last(&alias_device->alias_list, &group->aliaslist))
|
|
|
|
group->next = list_first_entry(&group->aliaslist,
|
|
|
|
struct dasd_device, alias_list);
|
|
|
|
else
|
|
|
|
group->next = list_first_entry(&alias_device->alias_list,
|
|
|
|
struct dasd_device, alias_list);
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
alias_priv = (struct dasd_eckd_private *) alias_device->private;
|
|
|
|
if ((alias_priv->count < private->count) && !alias_device->stopped)
|
|
|
|
return alias_device;
|
|
|
|
else
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Summary unit check handling depends on the way alias devices
|
|
|
|
* are handled so it is done here rather then in dasd_eckd.c
|
|
|
|
*/
|
|
|
|
static int reset_summary_unit_check(struct alias_lcu *lcu,
|
|
|
|
struct dasd_device *device,
|
|
|
|
char reason)
|
|
|
|
{
|
|
|
|
struct dasd_ccw_req *cqr;
|
|
|
|
int rc = 0;
|
2009-03-26 08:23:48 -06:00
|
|
|
struct ccw1 *ccw;
|
2008-01-26 06:11:23 -07:00
|
|
|
|
|
|
|
cqr = lcu->rsu_cqr;
|
|
|
|
strncpy((char *) &cqr->magic, "ECKD", 4);
|
|
|
|
ASCEBC((char *) &cqr->magic, 4);
|
2009-03-26 08:23:48 -06:00
|
|
|
ccw = cqr->cpaddr;
|
|
|
|
ccw->cmd_code = DASD_ECKD_CCW_RSCK;
|
|
|
|
ccw->flags = 0 ;
|
|
|
|
ccw->count = 16;
|
|
|
|
ccw->cda = (__u32)(addr_t) cqr->data;
|
2008-01-26 06:11:23 -07:00
|
|
|
((char *)cqr->data)[0] = reason;
|
|
|
|
|
|
|
|
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
|
|
|
|
cqr->retries = 255; /* set retry counter to enable basic ERP */
|
|
|
|
cqr->startdev = device;
|
|
|
|
cqr->memdev = device;
|
|
|
|
cqr->block = NULL;
|
|
|
|
cqr->expires = 5 * HZ;
|
|
|
|
cqr->buildclk = get_clock();
|
|
|
|
cqr->status = DASD_CQR_FILLED;
|
|
|
|
|
|
|
|
rc = dasd_sleep_on_immediatly(cqr);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void _restart_all_base_devices_on_lcu(struct alias_lcu *lcu)
|
|
|
|
{
|
|
|
|
struct alias_pav_group *pavgroup;
|
|
|
|
struct dasd_device *device;
|
|
|
|
struct dasd_eckd_private *private;
|
|
|
|
|
|
|
|
/* active and inactive list can contain alias as well as base devices */
|
|
|
|
list_for_each_entry(device, &lcu->active_devices, alias_list) {
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
if (private->uid.type != UA_BASE_DEVICE)
|
|
|
|
continue;
|
|
|
|
dasd_schedule_block_bh(device->block);
|
|
|
|
dasd_schedule_device_bh(device);
|
|
|
|
}
|
|
|
|
list_for_each_entry(device, &lcu->inactive_devices, alias_list) {
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
if (private->uid.type != UA_BASE_DEVICE)
|
|
|
|
continue;
|
|
|
|
dasd_schedule_block_bh(device->block);
|
|
|
|
dasd_schedule_device_bh(device);
|
|
|
|
}
|
|
|
|
list_for_each_entry(pavgroup, &lcu->grouplist, group) {
|
|
|
|
list_for_each_entry(device, &pavgroup->baselist, alias_list) {
|
|
|
|
dasd_schedule_block_bh(device->block);
|
|
|
|
dasd_schedule_device_bh(device);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void flush_all_alias_devices_on_lcu(struct alias_lcu *lcu)
|
|
|
|
{
|
|
|
|
struct alias_pav_group *pavgroup;
|
|
|
|
struct dasd_device *device, *temp;
|
|
|
|
struct dasd_eckd_private *private;
|
|
|
|
int rc;
|
|
|
|
unsigned long flags;
|
|
|
|
LIST_HEAD(active);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Problem here ist that dasd_flush_device_queue may wait
|
|
|
|
* for termination of a request to complete. We can't keep
|
|
|
|
* the lcu lock during that time, so we must assume that
|
|
|
|
* the lists may have changed.
|
|
|
|
* Idea: first gather all active alias devices in a separate list,
|
|
|
|
* then flush the first element of this list unlocked, and afterwards
|
|
|
|
* check if it is still on the list before moving it to the
|
|
|
|
* active_devices list.
|
|
|
|
*/
|
|
|
|
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
list_for_each_entry_safe(device, temp, &lcu->active_devices,
|
|
|
|
alias_list) {
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
if (private->uid.type == UA_BASE_DEVICE)
|
|
|
|
continue;
|
|
|
|
list_move(&device->alias_list, &active);
|
|
|
|
}
|
|
|
|
|
|
|
|
list_for_each_entry(pavgroup, &lcu->grouplist, group) {
|
|
|
|
list_splice_init(&pavgroup->aliaslist, &active);
|
|
|
|
}
|
|
|
|
while (!list_empty(&active)) {
|
|
|
|
device = list_first_entry(&active, struct dasd_device,
|
|
|
|
alias_list);
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
rc = dasd_flush_device_queue(device);
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
/*
|
|
|
|
* only move device around if it wasn't moved away while we
|
|
|
|
* were waiting for the flush
|
|
|
|
*/
|
|
|
|
if (device == list_first_entry(&active,
|
|
|
|
struct dasd_device, alias_list))
|
|
|
|
list_move(&device->alias_list, &lcu->active_devices);
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
}
|
|
|
|
|
2008-04-16 23:46:26 -06:00
|
|
|
static void __stop_device_on_lcu(struct dasd_device *device,
|
|
|
|
struct dasd_device *pos)
|
|
|
|
{
|
|
|
|
/* If pos == device then device is already locked! */
|
|
|
|
if (pos == device) {
|
2009-12-07 04:51:51 -07:00
|
|
|
dasd_device_set_stop_bits(pos, DASD_STOPPED_SU);
|
2008-04-16 23:46:26 -06:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
spin_lock(get_ccwdev_lock(pos->cdev));
|
2009-12-07 04:51:51 -07:00
|
|
|
dasd_device_set_stop_bits(pos, DASD_STOPPED_SU);
|
2008-04-16 23:46:26 -06:00
|
|
|
spin_unlock(get_ccwdev_lock(pos->cdev));
|
|
|
|
}
|
|
|
|
|
2008-01-26 06:11:23 -07:00
|
|
|
/*
|
|
|
|
* This function is called in interrupt context, so the
|
|
|
|
* cdev lock for device is already locked!
|
|
|
|
*/
|
|
|
|
static void _stop_all_devices_on_lcu(struct alias_lcu *lcu,
|
|
|
|
struct dasd_device *device)
|
|
|
|
{
|
|
|
|
struct alias_pav_group *pavgroup;
|
|
|
|
struct dasd_device *pos;
|
|
|
|
|
2008-04-16 23:46:26 -06:00
|
|
|
list_for_each_entry(pos, &lcu->active_devices, alias_list)
|
|
|
|
__stop_device_on_lcu(device, pos);
|
|
|
|
list_for_each_entry(pos, &lcu->inactive_devices, alias_list)
|
|
|
|
__stop_device_on_lcu(device, pos);
|
2008-01-26 06:11:23 -07:00
|
|
|
list_for_each_entry(pavgroup, &lcu->grouplist, group) {
|
2008-04-16 23:46:26 -06:00
|
|
|
list_for_each_entry(pos, &pavgroup->baselist, alias_list)
|
|
|
|
__stop_device_on_lcu(device, pos);
|
|
|
|
list_for_each_entry(pos, &pavgroup->aliaslist, alias_list)
|
|
|
|
__stop_device_on_lcu(device, pos);
|
2008-01-26 06:11:23 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void _unstop_all_devices_on_lcu(struct alias_lcu *lcu)
|
|
|
|
{
|
|
|
|
struct alias_pav_group *pavgroup;
|
|
|
|
struct dasd_device *device;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
list_for_each_entry(device, &lcu->active_devices, alias_list) {
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
2009-12-07 04:51:51 -07:00
|
|
|
dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
|
2008-01-26 06:11:23 -07:00
|
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
list_for_each_entry(device, &lcu->inactive_devices, alias_list) {
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
2009-12-07 04:51:51 -07:00
|
|
|
dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
|
2008-01-26 06:11:23 -07:00
|
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
list_for_each_entry(pavgroup, &lcu->grouplist, group) {
|
|
|
|
list_for_each_entry(device, &pavgroup->baselist, alias_list) {
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
2009-12-07 04:51:51 -07:00
|
|
|
dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
|
2008-01-26 06:11:23 -07:00
|
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
|
|
|
|
flags);
|
|
|
|
}
|
|
|
|
list_for_each_entry(device, &pavgroup->aliaslist, alias_list) {
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
2009-12-07 04:51:51 -07:00
|
|
|
dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
|
2008-01-26 06:11:23 -07:00
|
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
|
|
|
|
flags);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void summary_unit_check_handling_work(struct work_struct *work)
|
|
|
|
{
|
|
|
|
struct alias_lcu *lcu;
|
|
|
|
struct summary_unit_check_work_data *suc_data;
|
|
|
|
unsigned long flags;
|
|
|
|
struct dasd_device *device;
|
|
|
|
|
|
|
|
suc_data = container_of(work, struct summary_unit_check_work_data,
|
|
|
|
worker);
|
|
|
|
lcu = container_of(suc_data, struct alias_lcu, suc_data);
|
|
|
|
device = suc_data->device;
|
|
|
|
|
|
|
|
/* 1. flush alias devices */
|
|
|
|
flush_all_alias_devices_on_lcu(lcu);
|
|
|
|
|
|
|
|
/* 2. reset summary unit check */
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
2009-12-07 04:51:51 -07:00
|
|
|
dasd_device_remove_stop_bits(device,
|
|
|
|
(DASD_STOPPED_SU | DASD_STOPPED_PENDING));
|
2008-01-26 06:11:23 -07:00
|
|
|
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
|
|
|
reset_summary_unit_check(lcu, device, suc_data->reason);
|
|
|
|
|
|
|
|
spin_lock_irqsave(&lcu->lock, flags);
|
|
|
|
_unstop_all_devices_on_lcu(lcu);
|
|
|
|
_restart_all_base_devices_on_lcu(lcu);
|
|
|
|
/* 3. read new alias configuration */
|
|
|
|
_schedule_lcu_update(lcu, device);
|
|
|
|
lcu->suc_data.device = NULL;
|
|
|
|
spin_unlock_irqrestore(&lcu->lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* note: this will be called from int handler context (cdev locked)
|
|
|
|
*/
|
|
|
|
void dasd_alias_handle_summary_unit_check(struct dasd_device *device,
|
|
|
|
struct irb *irb)
|
|
|
|
{
|
|
|
|
struct alias_lcu *lcu;
|
|
|
|
char reason;
|
|
|
|
struct dasd_eckd_private *private;
|
2009-03-26 08:23:48 -06:00
|
|
|
char *sense;
|
2008-01-26 06:11:23 -07:00
|
|
|
|
|
|
|
private = (struct dasd_eckd_private *) device->private;
|
|
|
|
|
2009-03-26 08:23:48 -06:00
|
|
|
sense = dasd_get_sense(irb);
|
|
|
|
if (sense) {
|
|
|
|
reason = sense[8];
|
|
|
|
DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
|
|
|
|
"eckd handle summary unit check: reason", reason);
|
|
|
|
} else {
|
|
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
|
|
|
"eckd handle summary unit check:"
|
|
|
|
" no reason code available");
|
|
|
|
return;
|
|
|
|
}
|
2008-01-26 06:11:23 -07:00
|
|
|
|
|
|
|
lcu = private->lcu;
|
|
|
|
if (!lcu) {
|
2009-03-26 08:23:49 -06:00
|
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
2008-01-26 06:11:23 -07:00
|
|
|
"device not ready to handle summary"
|
|
|
|
" unit check (no lcu structure)");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
spin_lock(&lcu->lock);
|
|
|
|
_stop_all_devices_on_lcu(lcu, device);
|
|
|
|
/* prepare for lcu_update */
|
|
|
|
private->lcu->flags |= NEED_UAC_UPDATE | UPDATE_PENDING;
|
|
|
|
/* If this device is about to be removed just return and wait for
|
|
|
|
* the next interrupt on a different device
|
|
|
|
*/
|
|
|
|
if (list_empty(&device->alias_list)) {
|
2009-03-26 08:23:49 -06:00
|
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
2008-01-26 06:11:23 -07:00
|
|
|
"device is in offline processing,"
|
|
|
|
" don't do summary unit check handling");
|
|
|
|
spin_unlock(&lcu->lock);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (lcu->suc_data.device) {
|
|
|
|
/* already scheduled or running */
|
2009-03-26 08:23:49 -06:00
|
|
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
|
2008-01-26 06:11:23 -07:00
|
|
|
"previous instance of summary unit check worker"
|
|
|
|
" still pending");
|
|
|
|
spin_unlock(&lcu->lock);
|
|
|
|
return ;
|
|
|
|
}
|
|
|
|
lcu->suc_data.reason = reason;
|
|
|
|
lcu->suc_data.device = device;
|
|
|
|
spin_unlock(&lcu->lock);
|
|
|
|
schedule_work(&lcu->suc_data.worker);
|
|
|
|
};
|