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On Pandaboard perf_event_open syscall fails with errno = 19 (ENODEV)
when trying to open perf counter with type PERF_TYPE_HARDWARE.
The code to reproduce the error is attached. I checked that it runs
successfully on Beagleboard, Sandy Bridge, Bulldozer systems, and even
on Pandaboard if I request software events (e.g. type =
PERF_TYPE_SOFTWARE, config = PERF_COUNT_SW_CPU_CLOCK).
Linux Kernel (uname -a): Linux pandaboard 3.2.0-1418-omap4 #25-Ubuntu SMP
PREEMPT Fri Aug 31 18:41:31 UTC 2012 armv7l armv7l armv7l GNU/Linux
Distribution: Ubuntu Server 12.04
Loaded kernel modules (lsmod): cpufreq_powersave, cpufreq_conservative,
cpufreq_userspace, cpufreq_ondemand, dm_crypt, wl12xx_sdio, wl12xx, mac80211,
twl6040_vibra, ff_memless, cfg80211, leds_gpio
Kernel log (dmesg): contains message "hw perfevents: enabled with ARMv7
Cortex-A9 PMU driver, 7 counters available"
/proc/cpuinfo content:
Processor : ARMv7 Processor rev 10 (v7l)
processor : 0
BogoMIPS : 696.39
processor : 1
BogoMIPS : 681.68
Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x2
CPU part : 0xc09
CPU revision : 10
Hardware : OMAP4 Panda board
Revision : 0020
Serial : 0000000000000000
** Affects: linaro-landing-team-ti
Importance: Undecided
Status: New
** Tags: kernel pandaboard
--
perf_event_open syscall fails for HW counters on Pandaboard
https://bugs.launchpad.net/bugs/1048056
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Developers, which is subscribed to linaro-landing-team-ti.
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