From v3.4 onwards PMU's can be accessed using names listed under /sys/bus/event_source/devices/ This patch sets up format attributes per PMU to describe how to construct events for each PMU. Change-Id: I2dd1293e0a906c3075c02a125ccceefeb33a80e3 Signed-off-by: Ashwin Chaugule <ashwinc@codeaurora.org>