Hi Jeremy, Mark, On 2019/5/4 7:24, Jeremy Linton wrote: > This patch series enables the Arm Statistical Profiling > Extension (SPE) on ACPI platforms. > > This is possible because ACPI 6.3 uses a previously > reserved field in the MADT to store the SPE interrupt > number, similarly to how the normal PMU is described. > If a consistent valid interrupt exists across all the > cores in the system, a platform device is registered. > That then triggers the SPE module, which runs as normal. > > We also add the ability to parse the PPTT for IDENTICAL > cores. We then use this to sanity check the single SPE > device we create. This creates a bit of a problem with > respect to the specification though. The specification > says that its legal for multiple tree's to exist in the > PPTT. We handle this fine, but what happens in the > case of multiple tree's is that the lack of a common > node with IDENTICAL set forces us to assume that there > are multiple non-IDENTICAL cores in the machine. Adding this patch set on top of latest mainline kernel, and tested on D06 which has the SPE feature, in boot message shows it was probed successfully: arm_spe_pmu arm,spe-v1: probed for CPUs 0-95 [max_record_sz 128, align 4, features 0x7] but when I test it with spe events such as perf record -c 1024 -e arm_spe_0/branch_filter=0/ -o spe ls it fails with: failed to mmap with 12 (Cannot allocate memory), Confirmed that patch [0] is merged and other perf events are working fine. I narrowed this issue down that mmap() failed to alloc 4M memory in perf tool but seems have no relationship with this SPE patch set, then I'm lost, could you take look please? Thanks Hanjun [0]: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=528871b456026e6127d95b1b2bd8e3a003dc1614
