perf, x86: Complain louder about BIOSen corrupting CPU/PMU state and continue
authorIngo Molnar <mingo@elte.hu>
Fri, 25 Mar 2011 09:24:23 +0000 (10:24 +0100)
committerIngo Molnar <mingo@elte.hu>
Fri, 25 Mar 2011 10:23:41 +0000 (11:23 +0100)
commit45daae575e08bbf7405c5a3633e956fa364d1b4f
tree453f4ffc48012c14e57259e2ad95231b396e0ebc
parent242214f9c1eeaae40eca11e3b4d37bfce960a7cd
perf, x86: Complain louder about BIOSen corrupting CPU/PMU state and continue

Eric Dumazet reported that hardware PMU events do not work on his
system, due to the BIOS corrupting PMU state:

    Performance Events: PEBS fmt0+, Core2 events, Broken BIOS detected, using software events only.
    [Firmware Bug]: the BIOS has corrupted hw-PMU resources (MSR 186 is 43003c)

Linus suggested that we continue in the face of such BIOS-induced CPU
state corruption:

   http://lkml.org/lkml/2011/3/24/608

Such BIOSes will have to be fixed - Linux developers rely on a working and
fully capable PMU and the BIOS interfering with the CPU's PMU state is simply
not acceptable.

So this patch changes perf to continue when it detects such BIOS
interaction, some hardware events may be unreliable due to the BIOS
writing and re-writing them - there's not much the kernel can do
about that but to detect the corruption and report it.

Reported-and-tested-by: Eric Dumazet <eric.dumazet@gmail.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/kernel/cpu/perf_event.c