drivers: perf: Implement perf event mmap support in the legacy backend
Implement the needed callbacks in the legacy driver so that we can directly access the counters through perf in userspace. Signed-off-by:Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by:
Andrew Jones <ajones@ventanamicro.com> Reviewed-by:
Atish Patra <atishp@rivosinc.com>
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