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perf_cpum_cf: Add support for counters available with IBM zEC12

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Increase the maximum number of available counters and check if
the hardware supports the counter.  Support is indicated by the
version of the CPU-measurement counter facility.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner 2012-10-15 14:31:29 +02:00 committed by Martin Schwidefsky
parent cec8546638
commit f47586b24c
2 changed files with 6 additions and 2 deletions
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2
arch/s390/include/asm/perf_event.h
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@ -9,7 +9,7 @@
#include <asm/cpu_mf.h>
/* CPU-measurement counter facility */
#define PERF_CPUM_CF_MAX_CTR 160
#define PERF_CPUM_CF_MAX_CTR 256
/* Per-CPU flags for PMU states */
#define PMU_F_RESERVED 0x1000

6
arch/s390/kernel/perf_cpum_cf.c
View file

@ -94,7 +94,7 @@ static int get_counter_set(u64 event)
set = CPUMF_CTR_SET_USER;
else if (event < 128)
set = CPUMF_CTR_SET_CRYPTO;
else if (event < 160)
else if (event < 256)
set = CPUMF_CTR_SET_EXT;
return set;
@ -138,6 +138,10 @@ static int validate_ctr_version(const struct hw_perf_event *hwc)
case CPUMF_CTR_SET_EXT:
if (cpuhw->info.csvn < 1)
err = -EOPNOTSUPP;
if ((cpuhw->info.csvn == 1 && hwc->config > 159) ||
(cpuhw->info.csvn == 2 && hwc->config > 175) ||
(cpuhw->info.csvn > 2 && hwc->config > 255))
err = -EOPNOTSUPP;
break;
}