From: Atish Patra atishp@rivosinc.com
commit acc1b919f47926b089be21b8aaa29ec91fef0aa2 upstream.
Pass the upper half of the initial value of the counter correctly for RV32.
Fixes: 4905ec2fb7e6 ("RISC-V: Add sscofpmf extension support") Signed-off-by: Atish Patra atishp@rivosinc.com Reviewed-by: Guo Ren guoren@kernel.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20220711174632.4186047-2-atishp@rivosinc.com Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/perf/riscv_pmu_sbi.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/perf/riscv_pmu_sbi.c +++ b/drivers/perf/riscv_pmu_sbi.c @@ -525,8 +525,13 @@ static inline void pmu_sbi_start_overflo hwc = &event->hw; max_period = riscv_pmu_ctr_get_width_mask(event); init_val = local64_read(&hwc->prev_count) & max_period; +#if defined(CONFIG_32BIT) + sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx, 1, + flag, init_val, init_val >> 32, 0); +#else sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx, 1, flag, init_val, 0, 0); +#endif } ctr_ovf_mask = ctr_ovf_mask >> 1; idx++;