diff options
| author | Benjamin Block <bblock@linux.ibm.com> | 2019-10-25 19:12:48 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2019-10-29 05:16:15 +0300 |
| commit | 8155eb0785279728b6b2e29aba2ca52d16aa526f (patch) | |
| tree | cf3888c460269cc7e29d43f78f952537ae3524d1 /drivers/s390/scsi/zfcp_diag.h | |
| parent | 6028f7c4cd87cac13481255d7e35dd2c9207ecae (diff) | |
| download | linux-8155eb0785279728b6b2e29aba2ca52d16aa526f.tar.xz | |
scsi: zfcp: implicitly refresh port-data diagnostics when reading sysfs
This patch adds implicit updates to the sysfs entries that read the
diagnostic data stored in the "caching buffer" for Exchange Port Data.
An update is triggered once the buffer is older than ZFCP_DIAG_MAX_AGE
milliseconds (5s). This entails sending an Exchange Port Data command to
the FCP-Channel, and during its ingress path updating the cached data and
the timestamp. To prevent multiple concurrent userspace-applications from
triggering this update in parallel we synchronize all of them using a
wait-queue (waiting threads are interruptible; the updating thread is not).
Link: https://lore.kernel.org/r/c145b5cfc99a63b6a018b1184fbd27bb09c955f5.1572018132.git.bblock@linux.ibm.com
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/s390/scsi/zfcp_diag.h')
| -rw-r--r-- | drivers/s390/scsi/zfcp_diag.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_diag.h b/drivers/s390/scsi/zfcp_diag.h index 2deebccda17d..7ff8fb0bb735 100644 --- a/drivers/s390/scsi/zfcp_diag.h +++ b/drivers/s390/scsi/zfcp_diag.h @@ -71,6 +71,17 @@ void zfcp_diag_sysfs_destroy(struct zfcp_adapter *const adapter); void zfcp_diag_update_xdata(struct zfcp_diag_header *const hdr, const void *const data, const bool incomplete); +/* + * Function-Type used in zfcp_diag_update_buffer_limited() for the function + * that does the buffer-implementation dependent work. + */ +typedef int (*zfcp_diag_update_buffer_func)(struct zfcp_adapter *const adapter); + +int zfcp_diag_update_port_data_buffer(struct zfcp_adapter *const adapter); +int zfcp_diag_update_buffer_limited(struct zfcp_adapter *const adapter, + struct zfcp_diag_header *const hdr, + zfcp_diag_update_buffer_func buffer_update); + /** * zfcp_diag_support_sfp() - Return %true if the @adapter supports reporting * SFP Data. |