[PATCH v1 5/6] power: add eventdev support for power management

[Tyler Retzlaff]

On Mon, Oct 16, 2023 at 01:57:14PM -0700, Sivaprasad Tummala wrote:
> Add eventdev support to enable power saving when no events
> are arriving. It is based on counting the number of empty
> polls and, when the number reaches a certain threshold, entering
> an architecture-defined optimized power state that will either wait
> until a TSC timestamp expires, or when events arrive.
> 
> This API mandates a core-to-single-port mapping (i.e. one core polling
> multiple ports of event device is not supported). This should be ok
> as the general use case will have one CPU core using one port to
> enqueue/dequeue events from an eventdev.
> 
> This design is using Eventdev PMD Dequeue callbacks.
> 
> 1. MWAITX/MONITORX:
> 
>    When a certain threshold of empty polls is reached, the core will go
>    into a power optimized sleep while waiting on an address of next RX
>    descriptor to be written to.
> 
> 2. Pause instruction
> 
>    This method uses the pause instruction to avoid busy polling.
> 
> Signed-off-by: Sivaprasad Tummala <sivaprasad.tummala at amd.com>
> ---
>  lib/power/meson.build          |   2 +-
>  lib/power/rte_power_pmd_mgmt.c | 226 +++++++++++++++++++++++++++++++++
>  lib/power/rte_power_pmd_mgmt.h |  55 ++++++++
>  lib/power/version.map          |   4 +
>  4 files changed, 286 insertions(+), 1 deletion(-)
> 

...
> +
> +	# added in 23.07
> +	rte_power_eventdev_pmgmt_port_enable;
> +	rte_power_eventdev_pmgmt_port_disable;

23.07 is released, 23.11?

>  };
> -- 
> 2.34.1