FVP: Add support for multi-threaded CPUs
ARM CPUs with multi-threading implementation has more than one
Processing Element in a single physical CPU. Such an implementation will
reflect the following changes in the MPIDR register:
- The MT bit set;
- Affinity levels pertaining to cluster and CPUs occupy one level
higher than in a single-threaded implementation, and the lowest
affinity level pertains to hardware threads. MPIDR affinity level
fields essentially appear shifted to left than otherwise.
The FVP port henceforth assumes that both properties above to be
concomitant on a given FVP platform.
To accommodate for varied MPIDR formats at run time, this patch
re-implements the FVP platform-specific functions that translates MPIDR
values to a linear indices, along with required validation. The same
treatment is applied for GICv3 MPIDR hashing function as well.
An FVP-specific build option FVP_MAX_PE_PER_CPU is introduced which
specifies the maximum number of threads implemented per CPU. For
backwards compatibility, its value defaults to 1.
Change-Id: I729b00d3e121d16ce9a03de4f9db36dfac580e3f
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index d6e8ced..d9c624c 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -6,19 +6,28 @@
# Use the GICv3 driver on the FVP by default
FVP_USE_GIC_DRIVER := FVP_GICV3
+
# Use the SP804 timer instead of the generic one
FVP_USE_SP804_TIMER := 0
+# Default cluster count for FVP
+FVP_CLUSTER_COUNT := 2
+
+# Default number of threads per CPU on FVP
+FVP_MAX_PE_PER_CPU := 1
+
$(eval $(call assert_boolean,FVP_USE_SP804_TIMER))
$(eval $(call add_define,FVP_USE_SP804_TIMER))
# The FVP platform depends on this macro to build with correct GIC driver.
$(eval $(call add_define,FVP_USE_GIC_DRIVER))
-# Define default FVP_CLUSTER_COUNT to 2 and pass it into the build system.
-FVP_CLUSTER_COUNT := 2
+# Pass FVP_CLUSTER_COUNT to the build system.
$(eval $(call add_define,FVP_CLUSTER_COUNT))
+# Pass FVP_MAX_PE_PER_CPU to the build system.
+$(eval $(call add_define,FVP_MAX_PE_PER_CPU))
+
# Sanity check the cluster count and if FVP_CLUSTER_COUNT <= 2,
# choose the CCI driver , else the CCN driver
ifeq ($(FVP_CLUSTER_COUNT), 0)