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 000000000000..1bfe2bd630b5
--- /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 */