diff options
| author | Hendrik Brueckner <brueckner@linux.vnet.ibm.com> | 2013-12-12 16:32:47 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-12-16 14:37:51 +0100 |
| commit | 8c069ff4bd6063a3f15e606c882e03f75c7e7711 (patch) | |
| tree | 39fc5d8b13aee5c4c9a8ca2e21e4fefd9a308f1a /arch/s390/include | |
| parent | c716832513f30430179b60ac5ffd203c53f7eb40 (diff) | |
| download | lwn-8c069ff4bd6063a3f15e606c882e03f75c7e7711.tar.gz lwn-8c069ff4bd6063a3f15e606c882e03f75c7e7711.zip | |
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: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/cpu_mf.h | 14 | ||||
| -rw-r--r-- | arch/s390/include/asm/perf_event.h | 17 |
2 files changed, 28 insertions, 3 deletions
diff --git a/arch/s390/include/asm/cpu_mf.h b/arch/s390/include/asm/cpu_mf.h index f6dddeaad965..d707abc26157 100644 --- a/arch/s390/include/asm/cpu_mf.h +++ b/arch/s390/include/asm/cpu_mf.h @@ -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 diff --git a/arch/s390/include/asm/perf_event.h b/arch/s390/include/asm/perf_event.h index 34185020ae0a..b4eea25f379e 100644 --- a/arch/s390/include/asm/perf_event.h +++ b/arch/s390/include/asm/perf_event.h @@ -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 */ |