linux-kernel - Re: [patch 07/11] x86/perf/uncore: Track packages not per cpu data

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Date:	Fri, 19 Feb 2016 09:39:49 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Harish Chegondi <harish.chegondi@...el.com>,
	Kan Liang <kan.liang@...el.com>,
	Andi Kleen <andi.kleen@...el.com>
Subject: Re: [patch 07/11] x86/perf/uncore: Track packages not per cpu data

On Thu, 18 Feb 2016, Thomas Gleixner wrote:
> So there is a limitation to BIOS creativity and all we need is to maintain a
> logical package id.

Just for the record. This driver would fall apart today if the socket ids
would be > 7. The uncore extra PCI devs assume a fixed mapping between the
physid in their config space and the physid of the socket. If the pci config
space id would be > 8 then the storage space is exceeded.

#define UNCORE_SOCKET_MAX               8
struct pci_dev *uncore_extra_pci_dev[UNCORE_SOCKET_MAX][UNCORE_EXTRA_PCI_DEV_MAX];

Of course there is no range check for this either. uncore_pci_probe() sticks
it blindly into the array....

Thanks,

	tglx