Add support for FEAT_MTPMU for Armv8.6
If FEAT_PMUv3 is implemented and PMEVTYPER<n>(_EL0).MT bit is implemented
as well, it is possible to control whether PMU counters take into account
events happening on other threads.
If FEAT_MTPMU is implemented, EL3 (or EL2) can override the MT bit
leaving it to effective state of 0 regardless of any write to it.
This patch introduces the DISABLE_MTPMU flag, which allows to diable
multithread event count from EL3 (or EL2). The flag is disabled
by default so the behavior is consistent with those architectures
that do not implement FEAT_MTPMU.
Signed-off-by: Javier Almansa Sobrino <javier.almansasobrino@arm.com>
Change-Id: Iee3a8470ae8ba13316af1bd40c8d4aa86e0cb85e
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index 8adf4ad..1d243cf 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -185,6 +185,11 @@
of the binary image. If set to 1, then only the ELF image is built.
0 is the default.
+- ``DISABLE_MTPMU``: Boolean option to disable FEAT_MTPMU if implemented
+ (Armv8.6 onwards). Its default value is 0 to keep consistency with platforms
+ that do not implement FEAT_MTPMU. For more information on FEAT_MTPMU,
+ check the latest Arm ARM.
+
- ``DYN_DISABLE_AUTH``: Provides the capability to dynamically disable Trusted
Board Boot authentication at runtime. This option is meant to be enabled only
for development platforms. ``TRUSTED_BOARD_BOOT`` flag must be set if this