[Skiboot] [PATCH v2 1/5] skiboot/doc: Add documentation for trace-mode in imc.rst

Anju T Sudhakar anju at linux.vnet.ibm.com
Wed Dec 12 17:15:41 AEDT 2018

Add documentation for IMC trace-mode in imc.rst.

Signed-off-by: Anju T Sudhakar <anju at linux.vnet.ibm.com>
 doc/imc.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/doc/imc.rst b/doc/imc.rst
index 3324aa36..40d262f0 100644
--- a/doc/imc.rst
+++ b/doc/imc.rst
@@ -44,6 +44,15 @@ sampling duration) fetches the counter data and accumulate to main memory.
 Memory to accumulate counter data are refered from "PDBAR" (per-core scom)
 and "LDBAR" per-thread spr.
+Trace mode of IMC:
+POWER9 support two modes for IMC which are the Accumulation mode and
+Trace mode. In IMC Trace mode, event counted is fixed for cycles and on
+each overflow, hardware snapshots the program counter along with other
+details and writes into memory pointed by LDBAR. LDBAR has bits to
+indicate the IMC trace-mode.

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