linux-kernel - Re: [PATCH] [RESEND] perf/x86/intel/uncore: Fix the index of PCU.3 Broadwell CPUs

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Date:   Mon, 16 Jul 2018 00:34:44 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Masayoshi Mizuma <msys.mizuma@...il.com>,
        Kan Liang <kan.liang@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Masayoshi Mizuma <m.mizuma@...fujitsu.com>
Subject: Re: [PATCH] [RESEND] perf/x86/intel/uncore: Fix the index of PCU.3
 Broadwell CPUs


* Masayoshi Mizuma <msys.mizuma@...il.com> wrote:

> From: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
> 
> commit 15a3e845b01c ("perf/x86/intel/uncore: Fix SBOX support for
> Broadwell CPUs") introduced PCU.3 for Broadwell CPU. Unfortunately,
> the driver_data of PCU.3 conflicts to QPI Port 2 filter.
> 
>     { /* QPI Port 2 filter  */
>             PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x6f46),
>             .driver_data = UNCORE_PCI_DEV_DATA(UNCORE_EXTRA_PCI_DEV, 2),
> 
>     { /* PCU.3 (for Capability registers) */
>             PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x6fc0),
>             .driver_data = UNCORE_PCI_DEV_DATA(UNCORE_EXTRA_PCI_DEV,
>                                                HSWEP_PCI_PCU_3),
>                              // HSWEP_PCI_PCU_3 == 2

> --- a/arch/x86/events/intel/uncore_snbep.c
> +++ b/arch/x86/events/intel/uncore_snbep.c
> @@ -1030,6 +1030,7 @@ enum {
>  	SNBEP_PCI_QPI_PORT0_FILTER,
>  	SNBEP_PCI_QPI_PORT1_FILTER,
>  	HSWEP_PCI_PCU_3,
> +	BDX_PCI_PCU_3,
>  };

So we use a magic '2' enumerator in the 'QPI Port 2 filter', and that overlaps 
with HSWEP_PCI_PCU_3, right?

Shouldn't we clean up all the enumerators and not use magic numbers, and this fix 
the conflict?

Thanks,

	Ingo