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s390/cpumsf: Check for CPU Measurement sampling 

s390 IBM z15 introduces a check if the CPU Mesurement Facility
sampling is temporarily unavailable. If this is the case return -EBUSY
and abort the setup of CPU Measuement facility sampling.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
alistair/sunxi64-5.4-dsi
Thomas Richter 2019-09-20 11:57:43 +02:00 committed by Vasily Gorbik
parent 8513458280
commit 932bfc5aae
2 changed files with 10 additions and 1 deletions
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5
arch/s390/include/asm/cpu_mf.h
View File

@ -28,6 +28,8 @@ asm(".include \"asm/cpu_mf-insn.h\"\n");
CPU_MF_INT_SF_PRA|CPU_MF_INT_SF_SACA| \
CPU_MF_INT_SF_LSDA)
#define CPU_MF_SF_RIBM_NOTAV 0x1 /* Sampling unavailable */
/* CPU measurement facility support */
static inline int cpum_cf_avail(void)
{
@ -69,7 +71,8 @@ struct hws_qsi_info_block { /* Bit(s) */
unsigned long max_sampl_rate; /* 16-23: maximum sampling interval*/
unsigned long tear; /* 24-31: TEAR contents */
unsigned long dear; /* 32-39: DEAR contents */
unsigned int rsvrd0; /* 40-43: reserved */
unsigned int rsvrd0:24; /* 40-42: reserved */
unsigned int ribm:8; /* 43: Reserved by IBM */
unsigned int cpu_speed; /* 44-47: CPU speed */
unsigned long long rsvrd1; /* 48-55: reserved */
unsigned long long rsvrd2; /* 56-63: reserved */

6
arch/s390/kernel/perf_cpum_sf.c
View File

@ -803,6 +803,12 @@ static int __hw_perf_event_init(struct perf_event *event)
goto out;
}
if (si.ribm & CPU_MF_SF_RIBM_NOTAV) {
pr_warn("CPU Measurement Facility sampling is temporarily not available\n");
err = -EBUSY;
goto out;
}
/* Always enable basic sampling */
SAMPL_FLAGS(hwc) = PERF_CPUM_SF_BASIC_MODE;