diff options
Diffstat (limited to 'include/asm-s390/cmb.h')
| -rw-r--r-- | include/asm-s390/cmb.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/include/asm-s390/cmb.h b/include/asm-s390/cmb.h new file mode 100644 index 00000000000..1bfe2bd630b --- /dev/null +++ b/include/asm-s390/cmb.h @@ -0,0 +1,98 @@ +#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) +/* reset channel measurement block */ +#define BIODASDRESETCMB _IO(DASD_IOCTL_LETTER,34) +/* read channel measurement data */ +#define BIODASDREADCMB _IOWR(DASD_IOCTL_LETTER,32,u64) +/* read channel measurement data */ +#define BIODASDREADALLCMB _IOWR(DASD_IOCTL_LETTER,33,struct cmbdata) + +#ifdef __KERNEL__ + +/** + * 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 */ |