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Message-ID: <f40d8620-eb57-37be-a2f0-b7bf7a74c087@arm.com>
Date: Mon, 21 May 2018 10:34:19 +0100
From: Vladimir Murzin <vladimir.murzin@....com>
To: Marc Zyngier <marc.zyngier@....com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: Will Deacon <will.deacon@....com>,
Mark Rutland <mark.rutland@....com>,
Russell King <linux@....linux.org.uk>,
Vince Weaver <vincent.weaver@...ne.edu>,
Peter Zijlstra <peterz@...radead.org>,
Stefan Wahren <stefan.wahren@...e.com>,
Eric Anholt <eric@...olt.net>,
Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH v3 4/5] ARM: perf: Allow the use of the PMUv3 driver on
32bit ARM
On 18/05/18 15:39, Marc Zyngier wrote:
> +static inline int read_pmuver(void)
> +{
> + /* PMUVers is not a signed field */
> + u32 dfr0 = read_cpuid_ext(CPUID_EXT_DFR0);
> + return (dfr0 >> 24) & 0xf;
> +}
Should we rule out versions prior v3 here or in __armv8pmu_probe_pmu()?
Thanks
Vladimir
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