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https://github.com/edk2-porting/linux-next.git
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94bb063312
Fixes for several channel measurement facility bugs: * Blocks copied from the hardware might not be consistent. Solve this by moving the copying into idle state and repeating the copying. * avg_sample_interval changed with every read, even though no new block was available. Solve this by storing a timestamp when the last new block was received. * Several locking issues. * Measurements were not reenabled after a disconnected device became available again. * Remove #defines for ioctls that were never implemented. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
#ifndef S390_CMB_H
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#define S390_CMB_H
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/**
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* struct cmbdata -- channel measurement block data for user space
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*
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* @size: size of the stored data
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* @ssch_rsch_count: XXX
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* @sample_count:
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* @device_connect_time:
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* @function_pending_time:
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* @device_disconnect_time:
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* @control_unit_queuing_time:
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* @device_active_only_time:
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* @device_busy_time:
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* @initial_command_response_time:
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*
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* all values are stored as 64 bit for simplicity, especially
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* in 32 bit emulation mode. All time values are normalized to
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* nanoseconds.
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* Currently, two formats are known, which differ by the size of
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* this structure, i.e. the last two members are only set when
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* the extended channel measurement facility (first shipped in
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* z990 machines) is activated.
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* Potentially, more fields could be added, which results in a
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* new ioctl number.
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**/
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struct cmbdata {
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__u64 size;
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__u64 elapsed_time;
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/* basic and exended format: */
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__u64 ssch_rsch_count;
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__u64 sample_count;
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__u64 device_connect_time;
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__u64 function_pending_time;
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__u64 device_disconnect_time;
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__u64 control_unit_queuing_time;
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__u64 device_active_only_time;
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/* extended format only: */
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__u64 device_busy_time;
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__u64 initial_command_response_time;
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};
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/* enable channel measurement */
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#define BIODASDCMFENABLE _IO(DASD_IOCTL_LETTER,32)
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/* enable channel measurement */
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#define BIODASDCMFDISABLE _IO(DASD_IOCTL_LETTER,33)
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/* read channel measurement data */
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#define BIODASDREADALLCMB _IOWR(DASD_IOCTL_LETTER,33,struct cmbdata)
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#ifdef __KERNEL__
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struct ccw_device;
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/**
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* enable_cmf() - switch on the channel measurement for a specific device
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* @cdev: The ccw device to be enabled
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* returns 0 for success or a negative error value.
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*
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* Context:
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* non-atomic
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**/
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extern int enable_cmf(struct ccw_device *cdev);
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/**
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* disable_cmf() - switch off the channel measurement for a specific device
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* @cdev: The ccw device to be disabled
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* returns 0 for success or a negative error value.
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*
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* Context:
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* non-atomic
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**/
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extern int disable_cmf(struct ccw_device *cdev);
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/**
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* cmf_read() - read one value from the current channel measurement block
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* @cmf: the channel to be read
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* @index: the name of the value that is read
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*
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* Context:
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* any
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**/
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extern u64 cmf_read(struct ccw_device *cdev, int index);
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/**
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* cmf_readall() - read one value from the current channel measurement block
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* @cmf: the channel to be read
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* @data: a pointer to a data block that will be filled
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*
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* Context:
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* any
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**/
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extern int cmf_readall(struct ccw_device *cdev, struct cmbdata*data);
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extern void cmf_reset(struct ccw_device *cdev);
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#endif /* __KERNEL__ */
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#endif /* S390_CMB_H */
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