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powerpc/perf: Check that events only include valid bits on Power8 

A mistake we have made in the past is that we pull out the fields we
need from the event code, but don't check that there are no unknown bits
set. This means that we can't ever assign meaning to those unknown bits
in future.

Although we have once again failed to do this at release, it is still
early days for Power8 so I think we can still slip this in and get away
with it.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
CC: <stable@vger.kernel.org> [v3.10]
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2013-06-28 18:15:10 +10:00 committed by Benjamin Herrenschmidt
parent b14b6260ef
commit d8bec4c9cd
1 changed files with 13 additions and 0 deletions
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13
arch/powerpc/perf/power8-pmu.c
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@ -109,6 +109,16 @@
#define EVENT_IS_MARKED (EVENT_MARKED_MASK << EVENT_MARKED_SHIFT)
#define EVENT_PSEL_MASK 0xff /* PMCxSEL value */
#define EVENT_VALID_MASK \
((EVENT_THRESH_MASK << EVENT_THRESH_SHIFT) | \
(EVENT_SAMPLE_MASK << EVENT_SAMPLE_SHIFT) | \
(EVENT_CACHE_SEL_MASK << EVENT_CACHE_SEL_SHIFT) | \
(EVENT_PMC_MASK << EVENT_PMC_SHIFT) | \
(EVENT_UNIT_MASK << EVENT_UNIT_SHIFT) | \
(EVENT_COMBINE_MASK << EVENT_COMBINE_SHIFT) | \
(EVENT_MARKED_MASK << EVENT_MARKED_SHIFT) | \
EVENT_PSEL_MASK)
/* MMCRA IFM bits - POWER8 */
#define POWER8_MMCRA_IFM1 0x0000000040000000UL
#define POWER8_MMCRA_IFM2 0x0000000080000000UL
@ -212,6 +222,9 @@ static int power8_get_constraint(u64 event, unsigned long *maskp, unsigned long
mask = value = 0;
if (event & ~EVENT_VALID_MASK)
return -1;
pmc = (event >> EVENT_PMC_SHIFT) & EVENT_PMC_MASK;
unit = (event >> EVENT_UNIT_SHIFT) & EVENT_UNIT_MASK;
cache = (event >> EVENT_CACHE_SEL_SHIFT) & EVENT_CACHE_SEL_MASK;