sh: perf events: Document SH-4A raw event codes.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 38 insertions, 0 deletions

diff --git a/arch/sh/kernel/cpu/sh4a/perf_event.c b/arch/sh/kernel/cpu/sh4a/perf_event.c
index d0938345799f..eddc21973fa1 100644
--- a/arch/sh/kernel/cpu/sh4a/perf_event.c
+++ b/arch/sh/kernel/cpu/sh4a/perf_event.c
@@ -38,6 +38,44 @@
 static struct sh_pmu sh4a_pmu;
 
 /*
+ * Supported raw event codes:
+ *
+ *      Event Code      Description
+ *      ----------      -----------
+ *
+ *      0x0000          number of elapsed cycles
+ *      0x0200          number of elapsed cycles in privileged mode
+ *      0x0280          number of elapsed cycles while SR.BL is asserted
+ *      0x0202          instruction execution
+ *      0x0203          instruction execution in parallel
+ *      0x0204          number of unconditional branches
+ *      0x0208          number of exceptions
+ *      0x0209          number of interrupts
+ *      0x0220          UTLB miss caused by instruction fetch
+ *      0x0222          UTLB miss caused by operand access
+ *      0x02a0          number of ITLB misses
+ *      0x0028          number of accesses to instruction memories
+ *      0x0029          number of accesses to instruction cache
+ *      0x002a          instruction cache miss
+ *      0x022e          number of access to instruction X/Y memory
+ *      0x0030          number of reads to operand memories
+ *      0x0038          number of writes to operand memories
+ *      0x0031          number of operand cache read accesses
+ *      0x0039          number of operand cache write accesses
+ *      0x0032          operand cache read miss
+ *      0x003a          operand cache write miss
+ *      0x0236          number of reads to operand X/Y memory
+ *      0x023e          number of writes to operand X/Y memory
+ *      0x0237          number of reads to operand U memory
+ *      0x023f          number of writes to operand U memory
+ *      0x0337          number of U memory read buffer misses
+ *      0x02b4          number of wait cycles due to operand read access
+ *      0x02bc          number of wait cycles due to operand write access
+ *      0x0033          number of wait cycles due to operand cache read miss
+ *      0x003b          number of wait cycles due to operand cache write miss
+ */
+
+/*
  * Special reserved bits used by hardware emulators, read values will
  * vary, but writes must always be 0.
  */