On Wed, Jun 26, 2019 at 04:37:14PM -0500, 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. > > v4->v5: Remove error returns from arm_spe_acpi_register_device() > Add some review/test tags Cheers, I've pushed this out with the acks and typo fixes. https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/log/?h=for-next/perf Please let me know if you spot any problems. Will
