diff options
| author |   Benjamin Block <bblock@linux.ibm.com> | 2019-10-25 18:12:50 +0200 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2019-10-28 22:16:15 -0400 |
| commit | 8a72db70b5ca3c3feb3ca25519e8a9516cc60cfe (patch) | |
| tree | ff96c0068ace879f957671e8c0a680ea67822cb2 /drivers/s390 | |
| parent | scsi: zfcp: introduce sysfs interface to read the local B2B-Credit (diff) | |
| download | linux-dev-8a72db70b5ca3c3feb3ca25519e8a9516cc60cfe.tar.xz linux-dev-8a72db70b5ca3c3feb3ca25519e8a9516cc60cfe.zip | |
scsi: zfcp: implicitly refresh config-data diagnostics when reading sysfs
Adds implicit updates of cached diagnostics via Exchange Config Data when
reading sysfs attributes interfacing them. Right now this only affects the
new B2B-Credit diagnostic attribute.
This uses the same mechanism previously also used for cached diagnostics
of Exchange Port Data.
Link: https://lore.kernel.org/r/60a94f55f2630b74b468fed5f39880208abb2679.1572018132.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')
| -rw-r--r-- | drivers/s390/scsi/zfcp_diag.c | 30 | ||||
| -rw-r--r-- | drivers/s390/scsi/zfcp_diag.h | 1 | ||||
| -rw-r--r-- | drivers/s390/scsi/zfcp_sysfs.c | 5 |
3 files changed, 36 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_diag.c b/drivers/s390/scsi/zfcp_diag.c index 9c5a0f3431ca..5ef7b3288c6f 100644 --- a/drivers/s390/scsi/zfcp_diag.c +++ b/drivers/s390/scsi/zfcp_diag.c @@ -176,6 +176,36 @@ int zfcp_diag_update_port_data_buffer(struct zfcp_adapter *const adapter) return rc; } +/** + * zfcp_diag_update_config_data_buffer() - Implementation of + * &typedef zfcp_diag_update_buffer_func + * to collect and update Config Data. + * @adapter: Adapter to collect Config Data from. + * + * This call is SYNCHRONOUS ! It blocks till the respective command has + * finished completely, or has failed in some way. + * + * Return: + * * 0 - Successfully retrieved new Diagnostics and Updated the buffer; + * this also includes cases where data was retrieved, but + * incomplete; you'll have to check the flag ``incomplete`` + * of &struct zfcp_diag_header. + * * see zfcp_fsf_exchange_config_data_sync() for possible error-codes ( + * excluding -EAGAIN) + */ +int zfcp_diag_update_config_data_buffer(struct zfcp_adapter *const adapter) +{ + int rc; + + rc = zfcp_fsf_exchange_config_data_sync(adapter->qdio, NULL); + if (rc == -EAGAIN) + rc = 0; /* signaling incomplete via struct zfcp_diag_header */ + + /* buffer-data was updated in zfcp_fsf_exchange_config_data_handler() */ + + return rc; +} + static int __zfcp_diag_update_buffer(struct zfcp_adapter *const adapter, struct zfcp_diag_header *const hdr, zfcp_diag_update_buffer_func buffer_update, diff --git a/drivers/s390/scsi/zfcp_diag.h b/drivers/s390/scsi/zfcp_diag.h index 7ff8fb0bb735..cf2947cd8c8f 100644 --- a/drivers/s390/scsi/zfcp_diag.h +++ b/drivers/s390/scsi/zfcp_diag.h @@ -77,6 +77,7 @@ void zfcp_diag_update_xdata(struct zfcp_diag_header *const hdr, */ typedef int (*zfcp_diag_update_buffer_func)(struct zfcp_adapter *const adapter); +int zfcp_diag_update_config_data_buffer(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, diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c index 376d76b9f337..ae8e9137f448 100644 --- a/drivers/s390/scsi/zfcp_sysfs.c +++ b/drivers/s390/scsi/zfcp_sysfs.c @@ -687,6 +687,11 @@ static ssize_t zfcp_sysfs_adapter_diag_b2b_credit_show( diag_hdr = &adapter->diagnostics->config_data.header; + rc = zfcp_diag_update_buffer_limited( + adapter, diag_hdr, zfcp_diag_update_config_data_buffer); + if (rc != 0) + goto out; + spin_lock_irqsave(&diag_hdr->access_lock, flags); /* nport_serv_param doesn't contain the ELS_Command code */ nsp = (struct fc_els_flogi *)((unsigned long) |