armv8: generic_timer: Use event stream for udelay
Polling cntpct_el0 in a tight loop for delays is inefficient.
This is particularly apparent on Arm FVPs, which do not simulate
real time, meaning that a 1s sleep can take a couple of orders
of magnitude longer to execute in wall time.
If running at EL2 or above (where CNTHCTL_EL2 is available), enable
the cntpct_el0 event stream temporarily and use wfe to implement
the delay more efficiently. The event period is chosen as a
trade-off between efficiency and the fact that Arm FVPs do not
typically simulate real time.
This is only implemented for Armv8 boards, where an architectural
timer exists, and only enabled by default for the ARCH_VEXPRESS64
board family.
Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/arch/arm/cpu/armv8/Kconfig b/arch/arm/cpu/armv8/Kconfig
index 9f0fb36..199335c 100644
--- a/arch/arm/cpu/armv8/Kconfig
+++ b/arch/arm/cpu/armv8/Kconfig
@@ -191,6 +191,14 @@
Exception handling at all exception levels for External Abort and
SError interrupt exception are taken in EL3.
+config ARMV8_UDELAY_EVENT_STREAM
+ bool "Use the event stream for udelay"
+ default y if ARCH_VEXPRESS64
+ help
+ Use the event stream provided by the AArch64 architectural timer for
+ delays. This is more efficient than the default polling
+ implementation.
+
menuconfig ARMV8_CRYPTO
bool "ARM64 Accelerated Cryptographic Algorithms"