On 2019/6/15 9:09, 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. > > v3->v4: Rebase to 5.2. > Minor formatting, patch rearrangement. > Add missing `inline` in static header definition. > Drop ARM_SPE_ACPI and just use ARM_SPE_PMU. Tested on top of 5.2-rc1, I can see in the boot log: arm_spe_pmu arm,spe-v1: probed for CPUs 0-95 [max_record_sz 128, align 4, features 0x7] and I also tested perf record, and works as expected, Tested-by: Hanjun Guo <guohanjun@xxxxxxxxxx> Thanks Hanjun
