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Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6

Browse source 
* 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6:
  [S390] cio: unsolicited interrupts during sense pgid.
  [S390] cio: no path after machine check.
  [S390] cio: kernel stack overflow.
  [S390] dasd: fix device shutdown process.
  [S390] broken copy_in_user function.
This commit is contained in:
Linus Torvalds 2006-08-31 14:42:07 -07:00
commit dd1a47c21e
9 changed files with 218 additions and 144 deletions
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33
arch/s390/lib/uaccess.S
View file

@ -88,30 +88,31 @@ __copy_to_user_asm:
.globl __copy_in_user_asm
# %r2 = from, %r3 = n, %r4 = to
__copy_in_user_asm:
ahi %r3,-1
jo 6f
sacf 256
bras 1,1f
mvc 0(1,%r4),0(%r2)
0: mvc 0(256,%r4),0(%r2)
la %r2,256(%r2)
la %r4,256(%r4)
1: ahi %r3,-256
jnm 0b
2: ex %r3,0(%r1)
sacf 0
slr %r2,%r2
br 14
3: mvc 0(1,%r4),0(%r2)
bras %r1,4f
0: ahi %r3,257
1: mvc 0(1,%r4),0(%r2)
la %r2,1(%r2)
la %r4,1(%r4)
ahi %r3,-1
jnz 1b
2: lr %r2,%r3
br %r14
3: mvc 0(256,%r4),0(%r2)
la %r2,256(%r2)
la %r4,256(%r4)
4: ahi %r3,-256
jnm 3b
4: lr %r2,%r3
5: ex %r3,4(%r1)
sacf 0
6: slr %r2,%r2
br %r14
.section __ex_table,"a"
.long 0b,3b
.long 2b,3b
.long 3b,4b
.long 1b,2b
.long 3b,0b
.long 5b,0b
.previous
.align 4

37
arch/s390/lib/uaccess64.S
View file

@ -88,30 +88,31 @@ __copy_to_user_asm:
.globl __copy_in_user_asm
# %r2 = from, %r3 = n, %r4 = to
__copy_in_user_asm:
aghi %r3,-1
jo 6f
sacf 256
bras 1,1f
mvc 0(1,%r4),0(%r2)
0: mvc 0(256,%r4),0(%r2)
la %r2,256(%r2)
la %r4,256(%r4)
1: aghi %r3,-256
jnm 0b
2: ex %r3,0(%r1)
sacf 0
slgr %r2,%r2
br 14
3: mvc 0(1,%r4),0(%r2)
bras %r1,4f
0: aghi %r3,257
1: mvc 0(1,%r4),0(%r2)
la %r2,1(%r2)
la %r4,1(%r4)
aghi %r3,-1
jnm 3b
4: lgr %r2,%r3
sacf 0
jnz 1b
2: lgr %r2,%r3
br %r14
3: mvc 0(256,%r4),0(%r2)
la %r2,256(%r2)
la %r4,256(%r4)
4: aghi %r3,-256
jnm 3b
5: ex %r3,4(%r1)
sacf 0
6: slgr %r2,%r2
br 14
.section __ex_table,"a"
.quad 0b,3b
.quad 2b,3b
.quad 3b,4b
.quad 1b,2b
.quad 3b,0b
.quad 5b,0b
.previous
.align 4

192
drivers/s390/block/dasd.c
View file

@ -52,7 +52,7 @@ static void dasd_setup_queue(struct dasd_device * device);
static void dasd_free_queue(struct dasd_device * device);
static void dasd_flush_request_queue(struct dasd_device *);
static void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
static void dasd_flush_ccw_queue(struct dasd_device *, int);
static int dasd_flush_ccw_queue(struct dasd_device *, int);
static void dasd_tasklet(struct dasd_device *);
static void do_kick_device(void *data);
@ -60,6 +60,7 @@ static void do_kick_device(void *data);
* SECTION: Operations on the device structure.
*/
static wait_queue_head_t dasd_init_waitq;
static wait_queue_head_t dasd_flush_wq;
/*
* Allocate memory for a new device structure.
@ -121,7 +122,7 @@ dasd_free_device(struct dasd_device *device)
/*
* Make a new device known to the system.
*/
static inline int
static int
dasd_state_new_to_known(struct dasd_device *device)
{
int rc;
@ -145,7 +146,7 @@ dasd_state_new_to_known(struct dasd_device *device)
/*
* Let the system forget about a device.
*/
static inline void
static int
dasd_state_known_to_new(struct dasd_device * device)
{
/* Disable extended error reporting for this device. */
@ -163,12 +164,13 @@ dasd_state_known_to_new(struct dasd_device * device)
/* Give up reference we took in dasd_state_new_to_known. */
dasd_put_device(device);
return 0;
}
/*
* Request the irq line for the device.
*/
static inline int
static int
dasd_state_known_to_basic(struct dasd_device * device)
{
int rc;
@ -192,17 +194,23 @@ dasd_state_known_to_basic(struct dasd_device * device)
/*
* Release the irq line for the device. Terminate any running i/o.
*/
static inline void
static int
dasd_state_basic_to_known(struct dasd_device * device)
{
int rc;
dasd_gendisk_free(device);
dasd_flush_ccw_queue(device, 1);
rc = dasd_flush_ccw_queue(device, 1);
if (rc)
return rc;
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;
}
/*
@ -219,7 +227,7 @@ dasd_state_basic_to_known(struct dasd_device * device)
* In case the analysis returns an error, the device setup is stopped
* (a fake disk was already added to allow formatting).
*/
static inline int
static int
dasd_state_basic_to_ready(struct dasd_device * device)
{
int rc;
@ -247,25 +255,31 @@ dasd_state_basic_to_ready(struct dasd_device * device)
* Forget format information. Check if the target level is basic
* and if it is create fake disk for formatting.
*/
static inline void
static int
dasd_state_ready_to_basic(struct dasd_device * device)
{
dasd_flush_ccw_queue(device, 0);
int rc;
rc = dasd_flush_ccw_queue(device, 0);
if (rc)
return rc;
dasd_destroy_partitions(device);
dasd_flush_request_queue(device);
device->blocks = 0;
device->bp_block = 0;
device->s2b_shift = 0;
device->state = DASD_STATE_BASIC;
return 0;
}
/*
* Back to basic.
*/
static inline void
static int
dasd_state_unfmt_to_basic(struct dasd_device * device)
{
device->state = DASD_STATE_BASIC;
return 0;
}
/*
@ -273,7 +287,7 @@ dasd_state_unfmt_to_basic(struct dasd_device * device)
* the requeueing of requests from the linux request queue to the
* ccw queue.
*/
static inline int
static int
dasd_state_ready_to_online(struct dasd_device * device)
{
device->state = DASD_STATE_ONLINE;
@ -284,16 +298,17 @@ dasd_state_ready_to_online(struct dasd_device * device)
/*
* Stop the requeueing of requests again.
*/
static inline void
static int
dasd_state_online_to_ready(struct dasd_device * device)
{
device->state = DASD_STATE_READY;
return 0;
}
/*
* Device startup state changes.
*/
static inline int
static int
dasd_increase_state(struct dasd_device *device)
{
int rc;
@ -329,30 +344,37 @@ dasd_increase_state(struct dasd_device *device)
/*
* Device shutdown state changes.
*/
static inline int
static int
dasd_decrease_state(struct dasd_device *device)
{
int rc;
rc = 0;
if (device->state == DASD_STATE_ONLINE &&
device->target <= DASD_STATE_READY)
dasd_state_online_to_ready(device);
rc = dasd_state_online_to_ready(device);
if (device->state == DASD_STATE_READY &&
if (!rc &&
device->state == DASD_STATE_READY &&
device->target <= DASD_STATE_BASIC)
dasd_state_ready_to_basic(device);
rc = dasd_state_ready_to_basic(device);
if (device->state == DASD_STATE_UNFMT &&
if (!rc &&
device->state == DASD_STATE_UNFMT &&
device->target <= DASD_STATE_BASIC)
dasd_state_unfmt_to_basic(device);
rc = dasd_state_unfmt_to_basic(device);
if (device->state == DASD_STATE_BASIC &&
if (!rc &&
device->state == DASD_STATE_BASIC &&
device->target <= DASD_STATE_KNOWN)
dasd_state_basic_to_known(device);
rc = dasd_state_basic_to_known(device);
if (device->state == DASD_STATE_KNOWN &&
if (!rc &&
device->state == DASD_STATE_KNOWN &&
device->target <= DASD_STATE_NEW)
dasd_state_known_to_new(device);
rc = dasd_state_known_to_new(device);
return 0;
return rc;
}
/*
@ -701,6 +723,7 @@ dasd_term_IO(struct dasd_ccw_req * cqr)
cqr->retries--;
cqr->status = DASD_CQR_CLEAR;
cqr->stopclk = get_clock();
cqr->starttime = 0;
DBF_DEV_EVENT(DBF_DEBUG, device,
"terminate cqr %p successful",
cqr);
@ -978,6 +1001,7 @@ dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) {
cqr->status = DASD_CQR_QUEUED;
dasd_clear_timer(device);
wake_up(&dasd_flush_wq);
dasd_schedule_bh(device);
return;
}
@ -1241,6 +1265,10 @@ __dasd_check_expire(struct dasd_device * device)
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
if (cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) {
if (time_after_eq(jiffies, cqr->expires + cqr->starttime)) {
DEV_MESSAGE(KERN_ERR, device,
"internal error - timeout (%is) expired "
"for cqr %p (%i retries left)",
(cqr->expires/HZ), cqr, cqr->retries);
if (device->discipline->term_IO(cqr) != 0)
/* Hmpf, try again in 1/10 sec */
dasd_set_timer(device, 10);
@ -1285,46 +1313,100 @@ __dasd_start_head(struct dasd_device * device)
dasd_set_timer(device, 50);
}
static inline int
_wait_for_clear(struct dasd_ccw_req *cqr)
{
return (cqr->status == DASD_CQR_QUEUED);
}
/*
* Remove requests from the ccw queue.
* Remove all requests from the ccw queue (all = '1') or only block device
* requests in case all = '0'.
* Take care of the erp-chain (chained via cqr->refers) and remove either
* the whole erp-chain or none of the erp-requests.
* If a request is currently running, term_IO is called and the request
* is re-queued. Prior to removing the terminated request we need to wait
* for the clear-interrupt.
* In case termination is not possible we stop processing and just finishing
* the already moved requests.
*/
static void
static int
dasd_flush_ccw_queue(struct dasd_device * device, int all)
{
struct dasd_ccw_req *cqr, *orig, *n;
int rc, i;
struct list_head flush_queue;
struct list_head *l, *n;
struct dasd_ccw_req *cqr;
INIT_LIST_HEAD(&flush_queue);
spin_lock_irq(get_ccwdev_lock(device->cdev));
list_for_each_safe(l, n, &device->ccw_queue) {
cqr = list_entry(l, struct dasd_ccw_req, list);
rc = 0;
restart:
list_for_each_entry_safe(cqr, n, &device->ccw_queue, list) {
/* get original request of erp request-chain */
for (orig = cqr; orig->refers != NULL; orig = orig->refers);
/* Flush all request or only block device requests? */
if (all == 0 && cqr->callback == dasd_end_request_cb)
if (all == 0 && cqr->callback != dasd_end_request_cb &&
orig->callback != dasd_end_request_cb) {
continue;
if (cqr->status == DASD_CQR_IN_IO)
device->discipline->term_IO(cqr);
if (cqr->status != DASD_CQR_DONE ||
cqr->status != DASD_CQR_FAILED) {
cqr->status = DASD_CQR_FAILED;
}
/* Check status and move request to flush_queue */
switch (cqr->status) {
case DASD_CQR_IN_IO:
rc = device->discipline->term_IO(cqr);
if (rc) {
/* unable to terminate requeust */
DEV_MESSAGE(KERN_ERR, device,
"dasd flush ccw_queue is unable "
" to terminate request %p",
cqr);
/* stop flush processing */
goto finished;
}
break;
case DASD_CQR_QUEUED:
case DASD_CQR_ERROR:
/* set request to FAILED */
cqr->stopclk = get_clock();
cqr->status = DASD_CQR_FAILED;
break;
default: /* do not touch the others */
break;
}
/* Rechain request (including erp chain) */
for (i = 0; cqr != NULL; cqr = cqr->refers, i++) {
cqr->endclk = get_clock();
list_move_tail(&cqr->list, &flush_queue);
}
if (i > 1)
/* moved more than one request - need to restart */
goto restart;
}
finished:
spin_unlock_irq(get_ccwdev_lock(device->cdev));
/* Now call the callback function of flushed requests */
restart_cb:
list_for_each_entry_safe(cqr, n, &flush_queue, list) {
if (cqr->status == DASD_CQR_CLEAR) {
/* wait for clear interrupt! */
wait_event(dasd_flush_wq, _wait_for_clear(cqr));
cqr->status = DASD_CQR_FAILED;
}
/* Process finished ERP request. */
if (cqr->refers) {
__dasd_process_erp(device, cqr);
continue;
/* restart list_for_xx loop since dasd_process_erp
* might remove multiple elements */
goto restart_cb;
}
/* Rechain request on device request queue */
/* call the callback function */
cqr->endclk = get_clock();
list_move_tail(&cqr->list, &flush_queue);
}
spin_unlock_irq(get_ccwdev_lock(device->cdev));
/* Now call the callback function of flushed requests */
list_for_each_safe(l, n, &flush_queue) {
cqr = list_entry(l, struct dasd_ccw_req, list);
if (cqr->callback != NULL)
(cqr->callback)(cqr, cqr->callback_data);
}
return rc;
}
/*
@ -1510,10 +1592,8 @@ dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr)
if (device->discipline->term_IO) {
cqr->retries = -1;
device->discipline->term_IO(cqr);
/*nished =
* wait (non-interruptible) for final status
* because signal ist still pending
*/
/* wait (non-interruptible) for final status
* because signal ist still pending */
spin_unlock_irq(get_ccwdev_lock(device->cdev));
wait_event(wait_q, _wait_for_wakeup(cqr));
spin_lock_irq(get_ccwdev_lock(device->cdev));
@ -1546,19 +1626,11 @@ 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, list);
rc = device->discipline->term_IO(cqr);
if (rc == 0) {
/* termination successful */
cqr->status = DASD_CQR_QUEUED;
cqr->startclk = cqr->stopclk = 0;
cqr->starttime = 0;
}
return rc;
return device->discipline->term_IO(cqr);
}
int
@ -1726,10 +1798,7 @@ dasd_flush_request_queue(struct dasd_device * device)
return;
spin_lock_irq(&device->request_queue_lock);
while (!list_empty(&device->request_queue->queue_head)) {
req = elv_next_request(device->request_queue);
if (req == NULL)
break;
while ((req = elv_next_request(device->request_queue))) {
blkdev_dequeue_request(req);
dasd_end_request(req, 0);
}
@ -2091,6 +2160,7 @@ dasd_init(void)
int rc;
init_waitqueue_head(&dasd_init_waitq);
init_waitqueue_head(&dasd_flush_wq);
/* register 'common' DASD debug area, used for all DBF_XXX calls */
dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof (long));

10
drivers/s390/block/dasd_genhd.c
View file

@ -83,10 +83,12 @@ dasd_gendisk_alloc(struct dasd_device *device)
void
dasd_gendisk_free(struct dasd_device *device)
{
del_gendisk(device->gdp);
device->gdp->queue = NULL;
put_disk(device->gdp);
device->gdp = NULL;
if (device->gdp) {
del_gendisk(device->gdp);
device->gdp->queue = NULL;
put_disk(device->gdp);
device->gdp = NULL;
}
}
/*

14
drivers/s390/cio/ccwgroup.c
View file

@ -183,11 +183,9 @@ ccwgroup_create(struct device *root,
gdev->creator_id = creator_id;
gdev->count = argc;
gdev->dev = (struct device ) {
.bus = &ccwgroup_bus_type,
.parent = root,
.release = ccwgroup_release,
};
gdev->dev.bus = &ccwgroup_bus_type;
gdev->dev.parent = root;
gdev->dev.release = ccwgroup_release;
snprintf (gdev->dev.bus_id, BUS_ID_SIZE, "%s",
gdev->cdev[0]->dev.bus_id);
@ -391,10 +389,8 @@ int
ccwgroup_driver_register (struct ccwgroup_driver *cdriver)
{
/* register our new driver with the core */
cdriver->driver = (struct device_driver) {
.bus = &ccwgroup_bus_type,
.name = cdriver->name,
};
cdriver->driver.bus = &ccwgroup_bus_type;
cdriver->driver.name = cdriver->name;
return driver_register(&cdriver->driver);
}

10
drivers/s390/cio/chsc.c
View file

@ -238,8 +238,6 @@ s390_subchannel_remove_chpid(struct device *dev, void *data)
/* Check for single path devices. */
if (sch->schib.pmcw.pim == 0x80)
goto out_unreg;
if (sch->vpm == mask)
goto out_unreg;
if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) &&
(sch->schib.scsw.actl & SCSW_ACTL_SCHACT) &&
@ -258,6 +256,8 @@ s390_subchannel_remove_chpid(struct device *dev, void *data)
/* trigger path verification. */
if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
else if (sch->vpm == mask)
goto out_unreg;
out_unlock:
spin_unlock_irq(&sch->lock);
return 0;
@ -1391,10 +1391,8 @@ new_channel_path(int chpid)
/* fill in status, etc. */
chp->id = chpid;
chp->state = 1;
chp->dev = (struct device) {
.parent = &css[0]->device,
.release = chp_release,
};
chp->dev.parent = &css[0]->device;
chp->dev.release = chp_release;
snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp0.%x", chpid);
/* Obtain channel path description and fill it in. */

19
drivers/s390/cio/device.c
View file

@ -556,12 +556,11 @@ get_disc_ccwdev_by_devno(unsigned int devno, unsigned int ssid,
struct ccw_device *sibling)
{
struct device *dev;
struct match_data data = {
.devno = devno,
.ssid = ssid,
.sibling = sibling,
};
struct match_data data;
data.devno = devno;
data.ssid = ssid;
data.sibling = sibling;
dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
return dev ? to_ccwdev(dev) : NULL;
@ -835,10 +834,8 @@ io_subchannel_probe (struct subchannel *sch)
return -ENOMEM;
}
atomic_set(&cdev->private->onoff, 0);
cdev->dev = (struct device) {
.parent = &sch->dev,
.release = ccw_device_release,
};
cdev->dev.parent = &sch->dev;
cdev->dev.release = ccw_device_release;
INIT_LIST_HEAD(&cdev->private->kick_work.entry);
/* Do first half of device_register. */
device_initialize(&cdev->dev);
@ -977,9 +974,7 @@ ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch)
int rc;
/* Initialize the ccw_device structure. */
cdev->dev = (struct device) {
.parent = &sch->dev,
};
cdev->dev.parent= &sch->dev;
rc = io_subchannel_recog(cdev, sch);
if (rc)
return rc;

20
drivers/s390/cio/device_fsm.c
View file

@ -267,12 +267,10 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
notify = 1;
}
/* fill out sense information */
cdev->id = (struct ccw_device_id) {
.cu_type = cdev->private->senseid.cu_type,
.cu_model = cdev->private->senseid.cu_model,
.dev_type = cdev->private->senseid.dev_type,
.dev_model = cdev->private->senseid.dev_model,
};
cdev->id.cu_type = cdev->private->senseid.cu_type;
cdev->id.cu_model = cdev->private->senseid.cu_model;
cdev->id.dev_type = cdev->private->senseid.dev_type;
cdev->id.dev_model = cdev->private->senseid.dev_model;
if (notify) {
cdev->private->state = DEV_STATE_OFFLINE;
if (same_dev) {
@ -566,12 +564,10 @@ ccw_device_verify_done(struct ccw_device *cdev, int err)
/* Deliver fake irb to device driver, if needed. */
if (cdev->private->flags.fake_irb) {
memset(&cdev->private->irb, 0, sizeof(struct irb));
cdev->private->irb.scsw = (struct scsw) {
.cc = 1,
.fctl = SCSW_FCTL_START_FUNC,
.actl = SCSW_ACTL_START_PEND,
.stctl = SCSW_STCTL_STATUS_PEND,
};
cdev->private->irb.scsw.cc = 1;
cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
cdev->private->flags.fake_irb = 0;
if (cdev->handler)
cdev->handler(cdev, cdev->private->intparm,

27
drivers/s390/cio/device_pgid.c
View file

@ -23,6 +23,21 @@
#include "device.h"
#include "ioasm.h"
/*
* Helper function called from interrupt context to decide whether an
* operation should be tried again.
*/
static int __ccw_device_should_retry(struct scsw *scsw)
{
/* CC is only valid if start function bit is set. */
if ((scsw->fctl & SCSW_FCTL_START_FUNC) && scsw->cc == 1)
return 1;
/* No more activity. For sense and set PGID we stubbornly try again. */
if (!scsw->actl)
return 1;
return 0;
}
/*
* Start Sense Path Group ID helper function. Used in ccw_device_recog
* and ccw_device_sense_pgid.
@ -155,10 +170,10 @@ ccw_device_sense_pgid_irq(struct ccw_device *cdev, enum dev_event dev_event)
int ret;
irb = (struct irb *) __LC_IRB;
/* Retry sense pgid for cc=1. */
if (irb->scsw.stctl ==
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
if (irb->scsw.cc == 1) {
if (__ccw_device_should_retry(&irb->scsw)) {
ret = __ccw_device_sense_pgid_start(cdev);
if (ret && ret != -EBUSY)
ccw_device_sense_pgid_done(cdev, ret);
@ -391,10 +406,10 @@ ccw_device_verify_irq(struct ccw_device *cdev, enum dev_event dev_event)
int ret;
irb = (struct irb *) __LC_IRB;
/* Retry set pgid for cc=1. */
if (irb->scsw.stctl ==
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
if (irb->scsw.cc == 1)
if (__ccw_device_should_retry(&irb->scsw))
__ccw_device_verify_start(cdev);
return;
}
@ -494,10 +509,10 @@ ccw_device_disband_irq(struct ccw_device *cdev, enum dev_event dev_event)
int ret;
irb = (struct irb *) __LC_IRB;
/* Retry set pgid for cc=1. */
if (irb->scsw.stctl ==
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
if (irb->scsw.cc == 1)
if (__ccw_device_should_retry(&irb->scsw))
__ccw_device_disband_start(cdev);
return;
}