arm-trusted-firmware

dp-arm 872be88a29 Add PMF instrumentation points in TF In order to quantify the overall time spent in the PSCI software implementation, an initial collection of PMF instrumentation points has been added. Instrumentation has been added to the following code paths: - Entry to PSCI SMC handler. The timestamp is captured as early as possible during the runtime exception and stored in memory before entering the PSCI SMC handler. - Exit from PSCI SMC handler. The timestamp is captured after normal return from the PSCI SMC handler or if a low power state was requested it is captured in the bl31 warm boot path before return to normal world. - Entry to low power state. The timestamp is captured before entry to a low power state which implies either standby or power down. As these power states are mutually exclusive, only one timestamp is defined to describe both. It is possible to differentiate between the two power states using the PSCI STAT interface. - Exit from low power state. The timestamp is captured after a standby or power up operation has completed. To calculate the number of cycles spent running code in Trusted Firmware one can perform the following calculation: (exit_psci - enter_psci) - (exit_low_pwr - enter_low_pwr). The resulting number of cycles can be converted to time given the frequency of the counter. Change-Id: Ie3b8f3d16409b6703747093b3a2d5c7429ad0166 Signed-off-by: dp-arm <dimitris.papastamos@arm.com>	8 years ago
..
spd	opteed: assume aarch64 for optee	9 years ago
std_svc	Add PMF instrumentation points in TF	8 years ago

dp-arm 872be88a29 Add PMF instrumentation points in TF

In order to quantify the overall time spent in the PSCI software
implementation, an initial collection of PMF instrumentation points
has been added.

Instrumentation has been added to the following code paths:

- Entry to PSCI SMC handler.  The timestamp is captured as early
  as possible during the runtime exception and stored in memory
  before entering the PSCI SMC handler.

- Exit from PSCI SMC handler.  The timestamp is captured after
  normal return from the PSCI SMC handler or if a low power state
  was requested it is captured in the bl31 warm boot path before
  return to normal world.

- Entry to low power state.  The timestamp is captured before entry
  to a low power state which implies either standby or power down.
  As these power states are mutually exclusive, only one timestamp
  is defined to describe both.  It is possible to differentiate between
  the two power states using the PSCI STAT interface.

- Exit from low power state.  The timestamp is captured after a standby
  or power up operation has completed.

To calculate the number of cycles spent running code in Trusted Firmware
one can perform the following calculation:

(exit_psci - enter_psci) - (exit_low_pwr - enter_low_pwr).

The resulting number of cycles can be converted to time given the
frequency of the counter.

Change-Id: Ie3b8f3d16409b6703747093b3a2d5c7429ad0166
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>

8 years ago

spd

opteed: assume aarch64 for optee

9 years ago

std_svc

Add PMF instrumentation points in TF

8 years ago