From 1f1ee9ad6b298400c7a44f860231ac1d3cb7bfd6 Mon Sep 17 00:00:00 2001 From: Hannes Reinecke Date: Wed, 30 Jan 2013 09:26:12 +0000 Subject: s390/dasd: make number of retries configurable Instead of having the number of retries hard-coded in the various functions we should be using a default retry value, which can be modified via sysfs. Signed-off-by: Hannes Reinecke Signed-off-by: Stefan Weinhuber Signed-off-by: Martin Schwidefsky --- drivers/s390/block/dasd_devmap.c | 41 ++++++++++++++++++++++++++++++++++++++++ drivers/s390/block/dasd_diag.c | 3 ++- drivers/s390/block/dasd_eckd.c | 11 +++++++---- drivers/s390/block/dasd_fba.c | 5 ++++- drivers/s390/block/dasd_int.h | 3 +++ 5 files changed, 57 insertions(+), 6 deletions(-) diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c index a71bb8aaca1d..bc3e7afac18b 100644 --- a/drivers/s390/block/dasd_devmap.c +++ b/drivers/s390/block/dasd_devmap.c @@ -1240,6 +1240,46 @@ dasd_expires_store(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store); +static ssize_t +dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + int len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries); + dasd_put_device(device); + return len; +} + +static ssize_t +dasd_retries_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + unsigned long val; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + + if ((strict_strtoul(buf, 10, &val) != 0) || + (val > DASD_RETRIES_MAX)) { + dasd_put_device(device); + return -EINVAL; + } + + if (val) + device->default_retries = val; + + dasd_put_device(device); + return count; +} + +static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store); + static ssize_t dasd_reservation_policy_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -1350,6 +1390,7 @@ static struct attribute * dasd_attrs[] = { &dev_attr_erplog.attr, &dev_attr_failfast.attr, &dev_attr_expires.attr, + &dev_attr_retries.attr, &dev_attr_reservation_policy.attr, &dev_attr_last_known_reservation_state.attr, &dev_attr_safe_offline.attr, diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c index cc0603358522..154842242c3d 100644 --- a/drivers/s390/block/dasd_diag.c +++ b/drivers/s390/block/dasd_diag.c @@ -359,6 +359,7 @@ dasd_diag_check_device(struct dasd_device *device) } device->default_expires = DIAG_TIMEOUT; + device->default_retries = DIAG_MAX_RETRIES; /* Figure out position of label block */ switch (private->rdc_data.vdev_class) { @@ -555,7 +556,7 @@ static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, recid++; } } - cqr->retries = DIAG_MAX_RETRIES; + cqr->retries = memdev->default_retries; cqr->buildclk = get_tod_clock(); if (blk_noretry_request(req) || block->base->features & DASD_FEATURE_FAILFAST) diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 696735962938..05f5694c9c49 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -1682,6 +1682,9 @@ dasd_eckd_check_characteristics(struct dasd_device *device) /* set default timeout */ device->default_expires = DASD_EXPIRES; + /* set default retry count */ + device->default_retries = DASD_RETRIES; + if (private->gneq) { value = 1; for (i = 0; i < private->gneq->timeout.value; i++) @@ -2659,7 +2662,7 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single( cqr->block = block; cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */ cqr->lpm = startdev->path_data.ppm; - cqr->retries = 256; + cqr->retries = startdev->default_retries; cqr->buildclk = get_tod_clock(); cqr->status = DASD_CQR_FILLED; return cqr; @@ -2834,7 +2837,7 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track( cqr->block = block; cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */ cqr->lpm = startdev->path_data.ppm; - cqr->retries = 256; + cqr->retries = startdev->default_retries; cqr->buildclk = get_tod_clock(); cqr->status = DASD_CQR_FILLED; return cqr; @@ -3127,7 +3130,7 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track( cqr->block = block; cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */ cqr->lpm = startdev->path_data.ppm; - cqr->retries = 256; + cqr->retries = startdev->default_retries; cqr->buildclk = get_tod_clock(); cqr->status = DASD_CQR_FILLED; return cqr; @@ -3330,7 +3333,7 @@ static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev, cqr->block = block; cqr->expires = startdev->default_expires * HZ; cqr->lpm = startdev->path_data.ppm; - cqr->retries = 256; + cqr->retries = startdev->default_retries; cqr->buildclk = get_tod_clock(); cqr->status = DASD_CQR_FILLED; diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c index 4dd0e2f6047e..d232c83ea95a 100644 --- a/drivers/s390/block/dasd_fba.c +++ b/drivers/s390/block/dasd_fba.c @@ -29,6 +29,8 @@ #endif /* PRINTK_HEADER */ #define PRINTK_HEADER "dasd(fba):" +#define FBA_DEFAULT_RETRIES 32 + #define DASD_FBA_CCW_WRITE 0x41 #define DASD_FBA_CCW_READ 0x42 #define DASD_FBA_CCW_LOCATE 0x43 @@ -167,6 +169,7 @@ dasd_fba_check_characteristics(struct dasd_device *device) } device->default_expires = DASD_EXPIRES; + device->default_retries = FBA_DEFAULT_RETRIES; device->path_data.opm = LPM_ANYPATH; readonly = dasd_device_is_ro(device); @@ -369,7 +372,7 @@ static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev, cqr->memdev = memdev; cqr->block = block; cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */ - cqr->retries = 32; + cqr->retries = memdev->default_retries; cqr->buildclk = get_tod_clock(); cqr->status = DASD_CQR_FILLED; return cqr; diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h index 0785bd9bd5b6..ad42075868c7 100644 --- a/drivers/s390/block/dasd_int.h +++ b/drivers/s390/block/dasd_int.h @@ -224,6 +224,8 @@ struct dasd_ccw_req { /* default expiration time*/ #define DASD_EXPIRES 300 #define DASD_EXPIRES_MAX 40000000 +#define DASD_RETRIES 256 +#define DASD_RETRIES_MAX 32768 /* per dasd_ccw_req flags */ #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */ @@ -466,6 +468,7 @@ struct dasd_device { /* default expiration time in s */ unsigned long default_expires; + unsigned long default_retries; struct dentry *debugfs_dentry; struct dasd_profile profile; -- cgit v1.2.3