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SBOX on some Broadwell CPUs is broken because it's enabled unconditionally despite the fact that there are no SBOXes available. Check the Power Control Unit CAPID4 register to determine the number of available SBOXes on the particular CPU before trying to enable them. If there are none, nullify the SBOX descriptor so it isn't tried to be initialized. Signed-off-by: Oskar Senft <osk@google.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Mark van Dijk <mark@voidzero.net> Reviewed-by: Kan Liang <kan.liang@intel.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: ak@linux.intel.com Cc: peterz@infradead.org Cc: eranian@google.com Link: https://lkml.kernel.org/r/1521810690-2576-2-git-send-email-kan.liang@linux.intel.com |
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| core.c | ||
| Kconfig | ||
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| msr.c | ||
| perf_event.h | ||