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48910f8c35
Replace the static define (ZFCP_DIAG_MAX_AGE) with a per-adapter variable
(${adapter}->diagnostics->max_age). This new variable is exported via
sysfs, along with other, already existing adapter variables, and can both
be read and written. This way users can choose how much time should pass
between refreshes of diagnostic buffers. The default value for the age
remains to be five seconds.
By setting this new variable to 0, the caching of diagnostic buffers for
userspace accesses can also be completely removed.
All diagnostic buffers of a given adapter are subject to this setting in
the same way.
Link: https://lore.kernel.org/r/b1d0977cc884b16dd4ca6418e4320c56a4c31d63.1572018132.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>
102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* zfcp device driver
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*
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* Definitions for handling diagnostics in the the zfcp device driver.
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*
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* Copyright IBM Corp. 2018
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*/
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#ifndef ZFCP_DIAG_H
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#define ZFCP_DIAG_H
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#include <linux/spinlock.h>
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#include "zfcp_fsf.h"
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#include "zfcp_def.h"
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/**
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* struct zfcp_diag_header - general part of a diagnostic buffer.
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* @access_lock: lock protecting all the data in this buffer.
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* @updating: flag showing that an update for this buffer is currently running.
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* @incomplete: flag showing that the data in @buffer is incomplete.
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* @timestamp: time in jiffies when the data of this buffer was last captured.
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* @buffer: implementation-depending data of this buffer
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* @buffer_size: size of @buffer
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*/
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struct zfcp_diag_header {
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spinlock_t access_lock;
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/* Flags */
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u64 updating :1;
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u64 incomplete :1;
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unsigned long timestamp;
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void *buffer;
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size_t buffer_size;
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};
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/**
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* struct zfcp_diag_adapter - central storage for all diagnostics concerning an
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* adapter.
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* @sysfs_established: flag showing that the associated sysfs-group was created
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* during run of zfcp_adapter_enqueue().
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* @max_age: maximum age of data in diagnostic buffers before they need to be
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* refreshed (in ms).
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* @port_data: data retrieved using exchange port data.
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* @port_data.header: header with metadata for the cache in @port_data.data.
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* @port_data.data: cached QTCB Bottom of command exchange port data.
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* @config_data: data retrieved using exchange config data.
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* @config_data.header: header with metadata for the cache in @config_data.data.
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* @config_data.data: cached QTCB Bottom of command exchange config data.
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*/
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struct zfcp_diag_adapter {
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u64 sysfs_established :1;
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unsigned long max_age;
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struct {
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struct zfcp_diag_header header;
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struct fsf_qtcb_bottom_port data;
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} port_data;
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struct {
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struct zfcp_diag_header header;
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struct fsf_qtcb_bottom_config data;
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} config_data;
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};
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int zfcp_diag_adapter_setup(struct zfcp_adapter *const adapter);
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void zfcp_diag_adapter_free(struct zfcp_adapter *const adapter);
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int zfcp_diag_sysfs_setup(struct zfcp_adapter *const adapter);
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void zfcp_diag_sysfs_destroy(struct zfcp_adapter *const adapter);
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void zfcp_diag_update_xdata(struct zfcp_diag_header *const hdr,
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const void *const data, const bool incomplete);
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/*
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* Function-Type used in zfcp_diag_update_buffer_limited() for the function
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* that does the buffer-implementation dependent work.
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*/
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typedef int (*zfcp_diag_update_buffer_func)(struct zfcp_adapter *const adapter);
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int zfcp_diag_update_config_data_buffer(struct zfcp_adapter *const adapter);
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int zfcp_diag_update_port_data_buffer(struct zfcp_adapter *const adapter);
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int zfcp_diag_update_buffer_limited(struct zfcp_adapter *const adapter,
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struct zfcp_diag_header *const hdr,
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zfcp_diag_update_buffer_func buffer_update);
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/**
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* zfcp_diag_support_sfp() - Return %true if the @adapter supports reporting
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* SFP Data.
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* @adapter: adapter to test the availability of SFP Data reporting for.
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*/
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static inline bool
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zfcp_diag_support_sfp(const struct zfcp_adapter *const adapter)
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{
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return !!(adapter->adapter_features & FSF_FEATURE_REPORT_SFP_DATA);
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}
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#endif /* ZFCP_DIAG_H */
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