linux-kernel - Re: [PATCH] perf/x86/intel/uncore: add support for Haswell ULT IMC uncore

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Date:	Mon, 20 Apr 2015 14:34:36 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Sonny Rao <sonnyrao@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] perf/x86/intel/uncore: add support for Haswell ULT IMC uncore

On Mon, Apr 20, 2015 at 1:58 PM, Stephane Eranian <eranian@...gle.com> wrote:
> On Mon, Apr 20, 2015 at 11:56 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>>
>> On Mon, Apr 20, 2015 at 1:42 PM, Sonny Rao <sonnyrao@...omium.org> wrote:
>> > This uncore is the same as the Haswell desktop part but uses a
>> > different PCI ID.
>> >
>> > Signed-off-by: Sonny Rao <sonnyrao@...omium.org>
>> > ---
>> >  arch/x86/kernel/cpu/perf_event_intel_uncore_snb.c | 5 +++++
>> >  include/linux/pci_ids.h                           | 1 +
>> >  2 files changed, 6 insertions(+)
>> >
>> > diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore_snb.c b/arch/x86/kernel/cpu/perf_event_intel_uncore_snb.c
>> > index 3001015..0bda6fc 100644
>> > --- a/arch/x86/kernel/cpu/perf_event_intel_uncore_snb.c
>> > +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore_snb.c
>> > @@ -472,6 +472,10 @@ static const struct pci_device_id hsw_uncore_pci_ids[] = {
>> >                 PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_HSW_IMC),
>> >                 .driver_data = UNCORE_PCI_DEV_DATA(SNB_PCI_UNCORE_IMC, 0),
>> >         },
>> > +       { /* IMC */
>> > +               PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_HSW_U_IMC),
>> > +               .driver_data = UNCORE_PCI_DEV_DATA(SNB_PCI_UNCORE_IMC, 0),
>> > +       },
>> >         { /* end: all zeroes */ },
>> >  };
>> >
>> > @@ -502,6 +506,7 @@ static const struct imc_uncore_pci_dev desktop_imc_pci_ids[] = {
>> >         IMC_DEV(IVB_IMC, &ivb_uncore_pci_driver),    /* 3rd Gen Core processor */
>> >         IMC_DEV(IVB_E3_IMC, &ivb_uncore_pci_driver), /* Xeon E3-1200 v2/3rd Gen Core processor */
>> >         IMC_DEV(HSW_IMC, &hsw_uncore_pci_driver),    /* 4th Gen Core Processor */
>> > +       IMC_DEV(HSW_U_IMC, &hsw_uncore_pci_driver),  /* 4th Gen Core ULT Mobile Processor */
>> >         {  /* end marker */ }
>> >  };
>> >
>> > diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
>> > index 38cff8f..e5ae042 100644
>> > --- a/include/linux/pci_ids.h
>> > +++ b/include/linux/pci_ids.h
>> > @@ -2545,6 +2545,7 @@
>> >  #define PCI_DEVICE_ID_INTEL_IVB_IMC    0x0154
>> >  #define PCI_DEVICE_ID_INTEL_IVB_E3_IMC 0x0150
>> >  #define PCI_DEVICE_ID_INTEL_HSW_IMC    0x0c00
>> > +#define PCI_DEVICE_ID_INTEL_HSW_U_IMC  0x0a04
>>
>> Please either use the 0x0a04 constant directly in
>> perf_event_intel_uncore_snb.c, or explain why the #define should be
>> here, e.g., maybe it will be used in multiple places.  See the comment
>> at the top of pci_ids.h.
>>
> But then, the same reasoning would apply to the other 3 IMC defines,
> wouldn't it?

Yes.  But if we made a mistake in the past, that doesn't mean we
should repeat it today.

>> >  #define PCI_DEVICE_ID_INTEL_PXHD_0     0x0320
>> >  #define PCI_DEVICE_ID_INTEL_PXHD_1     0x0321
>> >  #define PCI_DEVICE_ID_INTEL_PXH_0      0x0329
>> > --
>> > 2.1.2
>> >
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