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authorStefan Haberland <stefan.haberland@de.ibm.com>2013-04-15 16:22:23 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-04-17 14:07:34 +0200
commitd42e17129b9f473386d67c6a6549c28bd0e2b52e (patch)
treecc410d624cd4ede3dcc88ac93d6793d8e566fa93 /drivers/s390/block/dasd.c
parente5dcf0025d7af58f525590ac86ac27cb44714e8d (diff)
downloadop-kernel-dev-d42e17129b9f473386d67c6a6549c28bd0e2b52e.zip
op-kernel-dev-d42e17129b9f473386d67c6a6549c28bd0e2b52e.tar.gz
s390/dasd: improve speed of dasdfmt
Reorganize format IO requests and enable usage of PAV. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block/dasd.c')
-rw-r--r--drivers/s390/block/dasd.c109
1 files changed, 99 insertions, 10 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index f1b7fdc..4195cc0 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -246,7 +246,7 @@ static struct dentry *dasd_debugfs_setup(const char *name,
static int dasd_state_known_to_basic(struct dasd_device *device)
{
struct dasd_block *block = device->block;
- int rc;
+ int rc = 0;
/* Allocate and register gendisk structure. */
if (block) {
@@ -273,7 +273,8 @@ static int dasd_state_known_to_basic(struct dasd_device *device)
DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
device->state = DASD_STATE_BASIC;
- return 0;
+
+ return rc;
}
/*
@@ -282,6 +283,7 @@ static int dasd_state_known_to_basic(struct dasd_device *device)
static int dasd_state_basic_to_known(struct dasd_device *device)
{
int rc;
+
if (device->block) {
dasd_profile_exit(&device->block->profile);
if (device->block->debugfs_dentry)
@@ -332,8 +334,10 @@ static int dasd_state_basic_to_ready(struct dasd_device *device)
if (block->base->discipline->do_analysis != NULL)
rc = block->base->discipline->do_analysis(block);
if (rc) {
- if (rc != -EAGAIN)
+ if (rc != -EAGAIN) {
device->state = DASD_STATE_UNFMT;
+ goto out;
+ }
return rc;
}
dasd_setup_queue(block);
@@ -341,11 +345,16 @@ static int dasd_state_basic_to_ready(struct dasd_device *device)
block->blocks << block->s2b_shift);
device->state = DASD_STATE_READY;
rc = dasd_scan_partitions(block);
- if (rc)
+ 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;
}
@@ -368,6 +377,11 @@ static int dasd_state_ready_to_basic(struct dasd_device *device)
{
int rc;
+ if (device->discipline->ready_to_basic) {
+ rc = device->discipline->ready_to_basic(device);
+ if (rc)
+ return rc;
+ }
device->state = DASD_STATE_BASIC;
if (device->block) {
struct dasd_block *block = device->block;
@@ -402,16 +416,10 @@ static int dasd_state_unfmt_to_basic(struct dasd_device *device)
static int
dasd_state_ready_to_online(struct dasd_device * device)
{
- int rc;
struct gendisk *disk;
struct disk_part_iter piter;
struct hd_struct *part;
- if (device->discipline->ready_to_online) {
- rc = device->discipline->ready_to_online(device);
- if (rc)
- return rc;
- }
device->state = DASD_STATE_ONLINE;
if (device->block) {
dasd_schedule_block_bh(device->block);
@@ -444,6 +452,7 @@ static int dasd_state_online_to_ready(struct dasd_device *device)
if (rc)
return rc;
}
+
device->state = DASD_STATE_READY;
if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
disk = device->block->bdev->bd_disk;
@@ -2223,6 +2232,77 @@ static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
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;
+ int rc;
+ struct dasd_ccw_req *cqr, *n;
+
+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) {
+ if (__dasd_sleep_on_erp(cqr))
+ rc = 1;
+ }
+ if (rc)
+ goto retry;
+
+
+ return 0;
+}
+
/*
* Queue a request to the tail of the device ccw_queue and wait for
* it's completion.
@@ -2233,6 +2313,15 @@ int dasd_sleep_on(struct dasd_ccw_req *cqr)
}
/*
+ * 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.
*/
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