diff options
| -rw-r--r-- | drivers/s390/cio/cmf.c | 87 | ||||
| -rw-r--r-- | include/asm-s390/cmb.h | 65 |
2 files changed, 89 insertions, 63 deletions
diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c index ff1e442d4b0..6ef0ab89547 100644 --- a/drivers/s390/cio/cmf.c +++ b/drivers/s390/cio/cmf.c @@ -74,19 +74,20 @@ enum cmb_index { * enum cmb_format - types of supported measurement block formats * * @CMF_BASIC: traditional channel measurement blocks supported - * by all machines that we run on + * by all machines that we run on * @CMF_EXTENDED: improved format that was introduced with the z990 - * machine - * @CMF_AUTODETECT: default: use extended format when running on a z990 - * or later machine, otherwise fall back to basic format - **/ + * machine + * @CMF_AUTODETECT: default: use extended format when running on a machine + * supporting extended format, otherwise fall back to + * basic format + */ enum cmb_format { CMF_BASIC, CMF_EXTENDED, CMF_AUTODETECT = -1, }; -/** +/* * format - actual format for all measurement blocks * * The format module parameter can be set to a value of 0 (zero) @@ -107,6 +108,7 @@ module_param(format, bool, 0444); * either with the help of a special pool or with kmalloc * @free: free memory allocated with @alloc * @set: enable or disable measurement + * @read: read a measurement entry at an index * @readall: read a measurement block in a common format * @reset: clear the data in the associated measurement block and * reset its time stamp @@ -120,7 +122,7 @@ struct cmb_operations { int (*readall)(struct ccw_device *, struct cmbdata *); void (*reset) (struct ccw_device *); void *(*align) (void *); - +/* private: */ struct attribute_group *attr_group; }; static struct cmb_operations *cmbops; @@ -471,6 +473,7 @@ static void cmf_generic_reset(struct ccw_device *cdev) * * @mem: pointer to CMBs (only in basic measurement mode) * @list: contains a linked list of all subchannels + * @num_channels: number of channels to be measured * @lock: protect concurrent access to @mem and @list */ struct cmb_area { @@ -503,10 +506,20 @@ module_param_named(maxchannels, cmb_area.num_channels, uint, 0444); /** * struct cmb - basic channel measurement block + * @ssch_rsch_count: number of ssch and rsch + * @sample_count: number of samples + * @device_connect_time: time of device connect + * @function_pending_time: time of function pending + * @device_disconnect_time: time of device disconnect + * @control_unit_queuing_time: time of control unit queuing + * @device_active_only_time: time of device active only + * @reserved: unused in basic measurement mode + * + * The measurement block as used by the hardware. The fields are described + * further in z/Architecture Principles of Operation, chapter 17. * - * cmb as used by the hardware the fields are described in z/Architecture - * Principles of Operation, chapter 17. - * The area to be a contiguous array and may not be reallocated or freed. + * The cmb area made up from these blocks must be a contiguous array and may + * not be reallocated or freed. * Only one cmb area can be present in the system. */ struct cmb { @@ -804,9 +817,20 @@ static struct cmb_operations cmbops_basic = { /** * struct cmbe - extended channel measurement block + * @ssch_rsch_count: number of ssch and rsch + * @sample_count: number of samples + * @device_connect_time: time of device connect + * @function_pending_time: time of function pending + * @device_disconnect_time: time of device disconnect + * @control_unit_queuing_time: time of control unit queuing + * @device_active_only_time: time of device active only + * @device_busy_time: time of device busy + * @initial_command_response_time: initial command response time + * @reserved: unused * - * cmb as used by the hardware, may be in any 64 bit physical location, - * the fields are described in z/Architecture Principles of Operation, + * The measurement block as used by the hardware. May be in any 64 bit physical + * location. + * The fields are described further in z/Architecture Principles of Operation, * third edition, chapter 17. */ struct cmbe { @@ -1218,7 +1242,15 @@ static ssize_t cmb_enable_store(struct device *dev, DEVICE_ATTR(cmb_enable, 0644, cmb_enable_show, cmb_enable_store); -/* enable_cmf/disable_cmf: module interface for cmf (de)activation */ +/** + * enable_cmf() - switch on the channel measurement for a specific device + * @cdev: The ccw device to be enabled + * + * Returns %0 for success or a negative error value. + * + * Context: + * non-atomic + */ int enable_cmf(struct ccw_device *cdev) { int ret; @@ -1240,6 +1272,15 @@ int enable_cmf(struct ccw_device *cdev) return ret; } +/** + * disable_cmf() - switch off the channel measurement for a specific device + * @cdev: The ccw device to be disabled + * + * Returns %0 for success or a negative error value. + * + * Context: + * non-atomic + */ int disable_cmf(struct ccw_device *cdev) { int ret; @@ -1252,11 +1293,31 @@ int disable_cmf(struct ccw_device *cdev) return ret; } +/** + * cmf_read() - read one value from the current channel measurement block + * @cdev: the channel to be read + * @index: the index of the value to be read + * + * Returns the value read or %0 if the value cannot be read. + * + * Context: + * any + */ u64 cmf_read(struct ccw_device *cdev, int index) { return cmbops->read(cdev, index); } +/** + * cmf_readall() - read the current channel measurement block + * @cdev: the channel to be read + * @data: a pointer to a data block that will be filled + * + * Returns %0 on success, a negative error value otherwise. + * + * Context: + * any + */ int cmf_readall(struct ccw_device *cdev, struct cmbdata *data) { return cmbops->readall(cdev, data); diff --git a/include/asm-s390/cmb.h b/include/asm-s390/cmb.h index 2e84eebaf8f..50196857d27 100644 --- a/include/asm-s390/cmb.h +++ b/include/asm-s390/cmb.h @@ -1,29 +1,29 @@ #ifndef S390_CMB_H #define S390_CMB_H /** - * struct cmbdata -- channel measurement block data for user space + * struct cmbdata - channel measurement block data for user space + * @size: size of the stored data + * @elapsed_time: time since last sampling + * @ssch_rsch_count: number of ssch and rsch + * @sample_count: number of samples + * @device_connect_time: time of device connect + * @function_pending_time: time of function pending + * @device_disconnect_time: time of device disconnect + * @control_unit_queuing_time: time of control unit queuing + * @device_active_only_time: time of device active only + * @device_busy_time: time of device busy (ext. format) + * @initial_command_response_time: initial command response time (ext. format) * - * @size: size of the stored data - * @ssch_rsch_count: XXX - * @sample_count: - * @device_connect_time: - * @function_pending_time: - * @device_disconnect_time: - * @control_unit_queuing_time: - * @device_active_only_time: - * @device_busy_time: - * @initial_command_response_time: - * - * all values are stored as 64 bit for simplicity, especially + * All values are stored as 64 bit for simplicity, especially * in 32 bit emulation mode. All time values are normalized to * nanoseconds. * Currently, two formats are known, which differ by the size of * this structure, i.e. the last two members are only set when * the extended channel measurement facility (first shipped in * z990 machines) is activated. - * Potentially, more fields could be added, which results in a + * Potentially, more fields could be added, which would result in a * new ioctl number. - **/ + */ struct cmbdata { __u64 size; __u64 elapsed_time; @@ -49,44 +49,9 @@ struct cmbdata { #ifdef __KERNEL__ struct ccw_device; -/** - * enable_cmf() - switch on the channel measurement for a specific device - * @cdev: The ccw device to be enabled - * returns 0 for success or a negative error value. - * - * Context: - * non-atomic - **/ extern int enable_cmf(struct ccw_device *cdev); - -/** - * disable_cmf() - switch off the channel measurement for a specific device - * @cdev: The ccw device to be disabled - * returns 0 for success or a negative error value. - * - * Context: - * non-atomic - **/ extern int disable_cmf(struct ccw_device *cdev); - -/** - * cmf_read() - read one value from the current channel measurement block - * @cmf: the channel to be read - * @index: the name of the value that is read - * - * Context: - * any - **/ - extern u64 cmf_read(struct ccw_device *cdev, int index); -/** - * cmf_readall() - read one value from the current channel measurement block - * @cmf: the channel to be read - * @data: a pointer to a data block that will be filled - * - * Context: - * any - **/ extern int cmf_readall(struct ccw_device *cdev, struct cmbdata *data); #endif /* __KERNEL__ */ |