[PATCH v8 16/26] PM / devfreq: rockchip-dfi: Add perf support

[Heiko Stübner]

Am Mittwoch, 18. Oktober 2023, 08:17:04 CEST schrieb Sascha Hauer:
> The DFI is a unit which is suitable for measuring DDR utilization, but
> so far it could only be used as an event driver for the DDR frequency
> scaling driver. This adds perf support to the DFI driver.
> 
> Usage with the 'perf' tool can look like:
> 
> perf stat -a -e rockchip_ddr/cycles/,\
> 		rockchip_ddr/read-bytes/,\
> 		rockchip_ddr/write-bytes/,\
> 		rockchip_ddr/bytes/ sleep 1
> 
>  Performance counter stats for 'system wide':
> 
>         1582524826      rockchip_ddr/cycles/
>            1802.25 MB   rockchip_ddr/read-bytes/
>            1793.72 MB   rockchip_ddr/write-bytes/
>            3595.90 MB   rockchip_ddr/bytes/
> 
>        1.014369709 seconds time elapsed
> 
> perf support has been tested on a RK3568 and a RK3399, the latter with
> dual channel DDR.
> 
> Reviewed-by: Sebastian Reichel <sebastian.reichel at collabora.com>
> Acked-by: Chanwoo Choi <cw00.choi at samsung.com>
> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>

Acked-by: Heiko Stuebner <heiko at sntech.de>