Following original patch [1] here's a patch with support of machine specific pmu events and PoC with initial support for sifive_u's HPM.
== Test scenarios == So, I tested this patches on current Linux master with perf. something like `perf stat -e branch-misses perf bench mem memcpy` works just fine, also 'perf record -e branch-misses perf bench mem memcpy' collect samples just fine and `perf report` works. == ToDos / Limitations == Second patch is only inital sifive_u's HPM support, without any filtering, events combining features or differrent counting algorithm for different events. There are also no tests, but if you have any suggestions about where I need to look to implement them, please point me to. == Changes since original patch == - Rebased to current master [1] https://lore.kernel.org/all/20240625144643.34733-1-alexei.filip...@syntacore.com/ Alexei Filippov (2): target/riscv: Add support for machine specific pmu's events hw/riscv/sifive_u.c: Add initial HPM support hw/misc/meson.build | 1 + hw/misc/sifive_u_pmu.c | 384 +++++++++++++++++++++++++++++++++ hw/riscv/sifive_u.c | 14 ++ include/hw/misc/sifive_u_pmu.h | 24 +++ target/riscv/cpu.c | 20 +- target/riscv/cpu.h | 9 + target/riscv/csr.c | 93 +++++--- target/riscv/pmu.c | 138 ++++++------ target/riscv/pmu.h | 19 +- 9 files changed, 599 insertions(+), 103 deletions(-) create mode 100644 hw/misc/sifive_u_pmu.c create mode 100644 include/hw/misc/sifive_u_pmu.h -- 2.34.1
