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Commit 8c069ff4 authored by Hendrik Brueckner's avatar Hendrik Brueckner Committed by Martin Schwidefsky
Browse files

s390/perf: add support for the CPU-Measurement Sampling Facility 



Introduce a perf PMU, "cpum_sf", to support the CPU-Measurement
Sampling Facility.  You can control the sampling facility through
this perf PMU interfaces.  Perf sampling events are created for
hardware samples.

For details about the CPU-Measurement Sampling Facility, see
"The Load-Program-Parameter and the CPU-Measurement Facilities" (SA23-2260).

Signed-off-by: default avatarHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent c7168325

arch/s390/include/asm/cpu_mf.h

+14 −0
Original line number Diff line number Diff line
@@ -210,6 +210,20 @@ static inline int lsctl(struct hws_lsctl_request_block *req) 


/* Sampling control helper functions */



#include <linux/time.h>



static inline unsigned long freq_to_sample_rate(struct hws_qsi_info_block *qsi,

						unsigned long freq)

{

	return (USEC_PER_SEC / freq) * qsi->cpu_speed;

}



static inline unsigned long sample_rate_to_freq(struct hws_qsi_info_block *qsi,

						unsigned long rate)

{

	return USEC_PER_SEC * qsi->cpu_speed / rate;

}



#define SDB_TE_ALERT_REQ_MASK	0x4000000000000000UL

#define SDB_TE_BUFFER_FULL_MASK 0x8000000000000000UL

arch/s390/include/asm/perf_event.h

+14 −3
Original line number Diff line number Diff line
@@ -15,12 +15,13 @@ 
#include <linux/device.h>

#include <asm/cpu_mf.h>



/* CPU-measurement counter facility */

#define PERF_CPUM_CF_MAX_CTR		256



/* Per-CPU flags for PMU states */

#define PMU_F_RESERVED			0x1000

#define PMU_F_ENABLED			0x2000

#define PMU_F_IN_USE			0x4000

#define PMU_F_ERR_IBE			0x0100

#define PMU_F_ERR_LSDA			0x0200

#define PMU_F_ERR_MASK			(PMU_F_ERR_IBE|PMU_F_ERR_LSDA)



/* Perf defintions for PMU event attributes in sysfs */

extern __init const struct attribute_group **cpumf_cf_event_group(void);
@@ -41,5 +42,15 @@ extern unsigned long perf_instruction_pointer(struct pt_regs *regs); 
extern unsigned long perf_misc_flags(struct pt_regs *regs);

#define perf_misc_flags(regs) perf_misc_flags(regs)



/* Perf PMU definitions for the counter facility */

#define PERF_CPUM_CF_MAX_CTR		256



/* Perf PMU definitions for the sampling facility */

#define PERF_CPUM_SF_MAX_CTR		1

#define PERF_EVENT_CPUM_SF		0xB0000UL	/* Raw event ID */



#define TEAR_REG(hwc)		((hwc)->last_tag)

#define SAMPL_RATE(hwc)		((hwc)->event_base)



#endif /* CONFIG_64BIT */

#endif /* _ASM_S390_PERF_EVENT_H */

arch/s390/kernel/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -60,7 +60,7 @@ obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o 
obj-$(CONFIG_CRASH_DUMP)	+= crash_dump.o



ifdef CONFIG_64BIT

obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o perf_cpum_cf.o \

obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o perf_cpum_cf.o perf_cpum_sf.o \

						perf_cpum_cf_events.o

obj-y				+= runtime_instr.o cache.o

endif