From 9bd46da45edd9701bcb2a221d58afe7d01febd1d Mon Sep 17 00:00:00 2001 From: Max Filippov Date: Sun, 14 Jun 2015 01:41:25 +0300 Subject: [PATCH] xtensa: implement counting and sampling perf events Xtensa Performance Monitor Module has up to 8 32 bit wide performance counters. Each counter may be enabled independently and can count any single type of hardware performance events. Event counting may be enabled and disabled globally (per PMM). Each counter has status register with bits indicating if the counter has been overflown and may be programmed to raise profiling IRQ on overflow. This IRQ is used to rewind counters and allow for counting more than 2^32 samples for counting events and to report samples for sampling events. For more details see Tensilica Debug User's Guide, chapter 8 "Performance monitor module". Cc: Peter Zijlstra Cc: Paul Mackerras Cc: Ingo Molnar Cc: Arnaldo Carvalho de Melo Signed-off-by: Max Filippov --- Reading git-format-patch failed