mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 17:50:54 +07:00
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
|
|
#define S390_CMB_H
|
|
/**
|
|
* struct cmbdata -- channel measurement block data for user space
|
|
*
|
|
* @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
|
|
* 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
|
|
* new ioctl number.
|
|
**/
|
|
struct cmbdata {
|
|
__u64 size;
|
|
__u64 elapsed_time;
|
|
/* basic and exended format: */
|
|
__u64 ssch_rsch_count;
|
|
__u64 sample_count;
|
|
__u64 device_connect_time;
|
|
__u64 function_pending_time;
|
|
__u64 device_disconnect_time;
|
|
__u64 control_unit_queuing_time;
|
|
__u64 device_active_only_time;
|
|
/* extended format only: */
|
|
__u64 device_busy_time;
|
|
__u64 initial_command_response_time;
|
|
};
|
|
|
|
/* enable channel measurement */
|
|
#define BIODASDCMFENABLE _IO(DASD_IOCTL_LETTER,32)
|
|
/* enable channel measurement */
|
|
#define BIODASDCMFDISABLE _IO(DASD_IOCTL_LETTER,33)
|
|
/* read channel measurement data */
|
|
#define BIODASDREADALLCMB _IOWR(DASD_IOCTL_LETTER,33,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);
|
|
extern void cmf_reset(struct ccw_device *cdev);
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* S390_CMB_H */
|