UPERF(4)

NAME
uperf - performance counters driver

SYNOPSIS
uperf* at ebus?
uperf* at sbus?

DESCRIPTION
Some UltraSPARC host bridges provide performance counters on their host bridges. The counters are a part of the system controller chip (usc, dsc, or qsc). On PCI machines the system controller shows up as a device on the EBus, but on SBus machines the system controller exists in SBus space. The uperf driver provides access to these counters via ioctl(2).

IOCTLS
All of the ioctl calls supported by the uperf driver take the following structure as an argument:

    struct uperf_io {
    	int cnt_flags;
    	int cnt_src0;
    	int cnt_src1;
    	u_int32_t cnt_val0;
    	u_int32_t cnt_val1;
    };

The cnt_flags field specifies which counters are being operated on and is a bit mask of UPERF_CNT0 and/or UPERF_CNT1.

The cnt_src0 and cnt_src1 fields specify the source for the counter. Not all counters support monitoring all sources and specifying an invalid source for a counter to monitor will result in an error. The sources are specified below:
UPERFSRC_SYSCK | system clock ticks
UPERFSRC_PRALL | all p-requests
UPERFSRC_PRP0 | p-requests from processor 0
UPERFSRC_PRU2S | p-requests from the U2S
UPERFSRC_UPA128 | cycles UPA 128 bit data is busy
UPERFSRC_UPA64 | cycles UPA 64 bit data is busy
UPERFSRC_PIOS | cycles stalled during PIO
UPERFSRC_MEMRI | memory requests issued
UPERFSRC_MCBUSY | cycles memory controller is busy
UPERFSRC_PXSH | stall cycles due to pending transaction scoreboard hit
UPERFSRC_P0CWMR | coherent write miss requests, processor 0
UPERFSRC_P1CWMR | coherent write miss requests, processor 1
UPERFSRC_CIT | coherent intervention transactions
UPERFSRC_U2SDAT | data transactions on U2S
UPERFSRC_CRXI | coherent read transactions issued
UPERFSRC_RDP0 | read requests, processor 0
UPERFSRC_P0CRMR | coherent read misses, processor 0
UPERFSRC_P0PIO | PIO accesses, processor 0
UPERFSRC_MEMRC | memory requests completed
UPERFSRC_P1RR | read requests, processor 1
UPERFSRC_CRMP1 | coherent read misses, processor 1
UPERFSRC_PIOP1 | PIO accesses, processor 1
UPERFSRC_CWXI | coherent write transactions issued
UPERFSRC_RP0 | read requests, processor 0
UPERFSRC_SDVRA | streaming DVMA read transfers, PCI bus A
UPERFSRC_SDVWA | streaming DVMA write transfers, PCI bus A
UPERFSRC_CDVRA | consistent DVMA read transfers, PCI bus A
UPERFSRC_CDVWA | consistent DVMA write transfers, PCI bus A
UPERFSRC_SBMA | streaming buffer misses, PCI bus A
UPERFSRC_DVA | DVMA cycles, PCI bus A
UPERFSRC_DVWA | words transferred via DVMA, PCI bus A
UPERFSRC_PIOA | cycles consumed by PIO, bus A
UPERFSRC_SDVRB | streaming DVMA read transfers, PCI bus B
UPERFSRC_SDVWB | streaming DVMA write transfers, PCI bus B
UPERFSRC_CDVRB | consistent DVMA read transfers, PCI bus B
UPERFSRC_CDVWB | consistent DVMA write transfers, PCI bus B
UPERFSRC_SBMB | streaming buffer misses, PCI bus B
UPERFSRC_DVB | DVMA cycles, PCI bus B
UPERFSRC_DVWB | words transferred via DVMA, PCI bus B
UPERFSRC_PIOB | cycles consumed by PIO, bus B
UPERFSRC_TLBMISS | TLB misses
UPERFSRC_NINTRS | interrupts
UPERFSRC_INACK | interrupt NACKS on UPA
UPERFSRC_PIOR | PIO read transfers
UPERFSRC_PIOW | PIO write transfers
UPERFSRC_MERGE | merge buffer transactions
UPERFSRC_TBLA | DMA requests retried due to tablewalks, PCI bus A
UPERFSRC_STCA | DMA requests retries due to STC, PCI bus A
UPERFSRC_TBLB | DMA requests retries due to tablewalks, PCI bus B
UPERFSRC_STCB | DMA requests retries due to STC, PCI bus B

The cnt_val0 and cnt_val1 contain the values fetched for the counters. Software using this interface should be prepared to handle the counters rolling over.

The uperf device responds to the following ioctl(2) calls, which are defined in <dev/sun/uperfio.h>.

UPIO_GCNTSRC
    (struct uperf_io) Retrieve the source the counters are monitoring. The cnt_flags is a bit mask for which of the counters is to be fetched. The result is returned in cnt_src0 and/or cnt_src1.

UPIO_SCNTSRC
    (struct uperf_io) Set the source the counters should monitor. This call also clears the current value of the counters that are set. The cnt_flags is a bit mask for which of the counters is to be set. The cnt_src0 and/or cnt_src1 fields specify the source to be set for the respective counter.

UPIO_CLRCNT
    (struct uperf_io) Clear the counters specified in cnt_flags.

UPIO_GETCNT
    (struct uperf_io) Retrieve the value for the counters specified in cnt_flags. The values are returned in cnt_val0 and/or cnt_val1.

SEE ALSO
ioctl(2), ebus(4), intro(4), sbus(4)

HISTORY
The uperf driver was first supported in OpenBSD 3.1.

AUTHORS
The driver was written by Jason Wright <jason@thought.net>.