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powerpc/perf: Fix Threshold Event Counter Multiplier width for P10

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Threshold Event Counter Multiplier (TECM) is part of Monitor Mode
Control Register A (MMCRA). This field along with Threshold Event
Counter Exponent (TECE) is used to get threshould counter value.
In Power10, this is a 8bit field, so patch fixes the
current code to modify the MMCRA[TECM] extraction macro to
handle this change. ISA v3.1 says this is a 7 bit field but
POWER10 it's actually 8 bits which will hopefully be fixed
in ISA v3.1 update.

Fixes: 170a315f41 ("powerpc/perf: Support to export MMCRA[TEC*] field to userspace")
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1608022578-1532-1-git-send-email-atrajeev@linux.vnet.ibm.com
This commit is contained in:
Madhavan Srinivasan 2020-12-15 03:56:18 -05:00 committed by Michael Ellerman
parent 2198d4934e
commit ef0e3b650f
2 changed files with 7 additions and 0 deletions
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3
arch/powerpc/perf/isa207-common.c
View File

@ -247,6 +247,9 @@ void isa207_get_mem_weight(u64 *weight)
u64 sier = mfspr(SPRN_SIER);
u64 val = (sier & ISA207_SIER_TYPE_MASK) >> ISA207_SIER_TYPE_SHIFT;
if (cpu_has_feature(CPU_FTR_ARCH_31))
mantissa = P10_MMCRA_THR_CTR_MANT(mmcra);
if (val == 0 || val == 7)
*weight = 0;
else

4
arch/powerpc/perf/isa207-common.h
View File

@ -231,6 +231,10 @@
#define MMCRA_THR_CTR_EXP(v) (((v) >> MMCRA_THR_CTR_EXP_SHIFT) &\
MMCRA_THR_CTR_EXP_MASK)
#define P10_MMCRA_THR_CTR_MANT_MASK 0xFFul
#define P10_MMCRA_THR_CTR_MANT(v) (((v) >> MMCRA_THR_CTR_MANT_SHIFT) &\
P10_MMCRA_THR_CTR_MANT_MASK)
/* MMCRA Threshold Compare bit constant for power9 */
#define p9_MMCRA_THR_CMP_SHIFT 45