diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/scsi/zfcp_diag.c | 23 | ||||
| -rw-r--r-- | drivers/s390/scsi/zfcp_diag.h | 4 | ||||
| -rw-r--r-- | drivers/s390/scsi/zfcp_sysfs.c | 45 |
3 files changed, 61 insertions, 11 deletions
diff --git a/drivers/s390/scsi/zfcp_diag.c b/drivers/s390/scsi/zfcp_diag.c index 5ef7b3288c6f..67a8f4e57db1 100644 --- a/drivers/s390/scsi/zfcp_diag.c +++ b/drivers/s390/scsi/zfcp_diag.c @@ -19,9 +19,6 @@ #include "zfcp_ext.h" #include "zfcp_def.h" -/* Max age of data in a diagnostics buffer before it needs a refresh (in ms). */ -#define ZFCP_DIAG_MAX_AGE (5 * 1000) - static DECLARE_WAIT_QUEUE_HEAD(__zfcp_diag_publish_wait); /** @@ -38,9 +35,6 @@ static DECLARE_WAIT_QUEUE_HEAD(__zfcp_diag_publish_wait); */ int zfcp_diag_adapter_setup(struct zfcp_adapter *const adapter) { - /* set the timestamp so that the first test on age will always fail */ - const unsigned long initial_timestamp = - jiffies - msecs_to_jiffies(ZFCP_DIAG_MAX_AGE); struct zfcp_diag_adapter *diag; struct zfcp_diag_header *hdr; @@ -48,13 +42,16 @@ int zfcp_diag_adapter_setup(struct zfcp_adapter *const adapter) if (diag == NULL) return -ENOMEM; + diag->max_age = (5 * 1000); /* default value: 5 s */ + /* setup header for port_data */ hdr = &diag->port_data.header; spin_lock_init(&hdr->access_lock); hdr->buffer = &diag->port_data.data; hdr->buffer_size = sizeof(diag->port_data.data); - hdr->timestamp = initial_timestamp; + /* set the timestamp so that the first test on age will always fail */ + hdr->timestamp = jiffies - msecs_to_jiffies(diag->max_age); /* setup header for config_data */ hdr = &diag->config_data.header; @@ -62,7 +59,8 @@ int zfcp_diag_adapter_setup(struct zfcp_adapter *const adapter) spin_lock_init(&hdr->access_lock); hdr->buffer = &diag->config_data.data; hdr->buffer_size = sizeof(diag->config_data.data); - hdr->timestamp = initial_timestamp; + /* set the timestamp so that the first test on age will always fail */ + hdr->timestamp = jiffies - msecs_to_jiffies(diag->max_age); adapter->diagnostics = diag; return 0; @@ -240,7 +238,8 @@ static int __zfcp_diag_update_buffer(struct zfcp_adapter *const adapter, } static bool -__zfcp_diag_test_buffer_age_isfresh(const struct zfcp_diag_header *const hdr) +__zfcp_diag_test_buffer_age_isfresh(const struct zfcp_diag_adapter *const diag, + const struct zfcp_diag_header *const hdr) __must_hold(hdr->access_lock) { const unsigned long now = jiffies; @@ -252,7 +251,7 @@ __zfcp_diag_test_buffer_age_isfresh(const struct zfcp_diag_header *const hdr) if (!time_after_eq(now, hdr->timestamp)) return false; - if (jiffies_to_msecs(now - hdr->timestamp) >= ZFCP_DIAG_MAX_AGE) + if (jiffies_to_msecs(now - hdr->timestamp) >= diag->max_age) return false; return true; @@ -291,7 +290,9 @@ int zfcp_diag_update_buffer_limited(struct zfcp_adapter *const adapter, spin_lock_irqsave(&hdr->access_lock, flags); - for (rc = 0; !__zfcp_diag_test_buffer_age_isfresh(hdr); rc = 0) { + for (rc = 0; + !__zfcp_diag_test_buffer_age_isfresh(adapter->diagnostics, hdr); + rc = 0) { rc = __zfcp_diag_update_buffer(adapter, hdr, buffer_update, &flags); if (rc != -EAGAIN) diff --git a/drivers/s390/scsi/zfcp_diag.h b/drivers/s390/scsi/zfcp_diag.h index cf2947cd8c8f..b9c93d15f67c 100644 --- a/drivers/s390/scsi/zfcp_diag.h +++ b/drivers/s390/scsi/zfcp_diag.h @@ -42,6 +42,8 @@ struct zfcp_diag_header { * adapter. * @sysfs_established: flag showing that the associated sysfs-group was created * during run of zfcp_adapter_enqueue(). + * @max_age: maximum age of data in diagnostic buffers before they need to be + * refreshed (in ms). * @port_data: data retrieved using exchange port data. * @port_data.header: header with metadata for the cache in @port_data.data. * @port_data.data: cached QTCB Bottom of command exchange port data. @@ -52,6 +54,8 @@ struct zfcp_diag_header { struct zfcp_diag_adapter { u64 sysfs_established :1; + unsigned long max_age; + struct { struct zfcp_diag_header header; struct fsf_qtcb_bottom_port data; diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c index ae8e9137f448..494b9fe9cc94 100644 --- a/drivers/s390/scsi/zfcp_sysfs.c +++ b/drivers/s390/scsi/zfcp_sysfs.c @@ -326,6 +326,50 @@ static ssize_t zfcp_sysfs_port_remove_store(struct device *dev, static ZFCP_DEV_ATTR(adapter, port_remove, S_IWUSR, NULL, zfcp_sysfs_port_remove_store); +static ssize_t +zfcp_sysfs_adapter_diag_max_age_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(to_ccwdev(dev)); + ssize_t rc; + + if (!adapter) + return -ENODEV; + + /* ceil(log(2^64 - 1) / log(10)) = 20 */ + rc = scnprintf(buf, 20 + 2, "%lu\n", adapter->diagnostics->max_age); + + zfcp_ccw_adapter_put(adapter); + return rc; +} + +static ssize_t +zfcp_sysfs_adapter_diag_max_age_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(to_ccwdev(dev)); + unsigned long max_age; + ssize_t rc; + + if (!adapter) + return -ENODEV; + + rc = kstrtoul(buf, 10, &max_age); + if (rc != 0) + goto out; + + adapter->diagnostics->max_age = max_age; + + rc = count; +out: + zfcp_ccw_adapter_put(adapter); + return rc; +} +static ZFCP_DEV_ATTR(adapter, diag_max_age, 0644, + zfcp_sysfs_adapter_diag_max_age_show, + zfcp_sysfs_adapter_diag_max_age_store); + static struct attribute *zfcp_adapter_attrs[] = { &dev_attr_adapter_failed.attr, &dev_attr_adapter_in_recovery.attr, @@ -338,6 +382,7 @@ static struct attribute *zfcp_adapter_attrs[] = { &dev_attr_adapter_lic_version.attr, &dev_attr_adapter_status.attr, &dev_attr_adapter_hardware_version.attr, + &dev_attr_adapter_diag_max_age.attr, NULL }; |