riscv: dts: tenstorrent: Add PMU node to blackhole for Linux perf support

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Add a riscv,pmu device tree node with SBI PMU event mappings for the
SiFive X280 hardware performance counters. This enables OpenSBI to
expose the SBI PMU extension, allowing Linux perf to use the 4
programmable counters (mhpmcounter3-6) across 3 event classes:
instruction commit, microarchitectural, and memory system events.

Event encodings are derived from the SiFive Tenstorrent X280 MC Manual
(21G3.04.00) Table 13, section 3.10.5.

Assisted-by: Claude:claude-opus-4-6[1m]
Signed-off-by: Michael Neuling <mikey@neuling.org>
Reviewed-by: Drew Fustini <fustini@kernel.org>
Signed-off-by: Drew Fustini <fustini@kernel.org>

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Michael Neuling 2026-04-09 21:49:59 -05:00 • committed by Drew Fustini

parent 254f49634e

commit 0e400da642

1 changed files with 48 additions and 0 deletions

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arch/riscv/boot/dts/tenstorrent/blackhole.dtsi

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