linux-kernel - Re: [PATCH v5 00/25] Add perf support to the rockchip-dfi driver

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Date:   Wed, 14 Jun 2023 17:27:21 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Sascha Hauer <s.hauer@...gutronix.de>
Cc:     linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, Heiko Stuebner <heiko@...ech.de>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>, kernel@...gutronix.de,
        Michael Riesch <michael.riesch@...fvision.net>,
        Robin Murphy <robin.murphy@....com>,
        Vincent Legoll <vincent.legoll@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 00/25] Add perf support to the rockchip-dfi driver

Hi,

On Wed, Jun 14, 2023 at 03:40:34PM +0200, Sebastian Reichel wrote:
> I tested the series on RK3588 EVB1. The read/write byts looks
> sensible. Sometimes cycles reads unrealistic values, though:
> 
> 18446744070475110400      rockchip_ddr/cycles/

I have seen this going off a few times with and without memory
pressure. If it's way off, it always seems to follow the same
pattern: The upper 32 bits are 0xffffffff instead of 0x00000000
with the lower 32 bits containing sensible data.

-- Sebastian

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