[PATCH v4 0/1] Provide the frequency of time CSR via hwprobe

[Yunhui Cui]

Some applications (e.g., DPDK) use the time counter for basic performance
analysis as well as fine grained time-keeping. So we need export the time CSR
frequency to userspace by hwporbe syscall.

Changes:
v1->v2:
Modify "mtime" to "time CSR".

v2->v3:
Rebase "RISCV_HWPROBE_MAX_KEY 7" to "RISCV_HWPROBE_MAX_KEY 8" from
Jesse.

v3->v4:
1. Update the commit log from Punit.

2. Because RISCV_HWPROBE_MAX_KEY in
https://git.kernel.org/pub/scm/linux/kernel/git/palmer/linux.git/tree/arch/riscv/include/asm/hwprobe.h?h=for-next is 6,
so keep RISCV_HWPROBE_MAX_KEY to 7

Palmer Dabbelt (1):
  RISC-V: Provide the frequency of time CSR via hwprobe

 Documentation/arch/riscv/hwprobe.rst  | 2 ++
 arch/riscv/include/asm/hwprobe.h      | 2 +-
 arch/riscv/include/uapi/asm/hwprobe.h | 1 +
 arch/riscv/kernel/sys_hwprobe.c       | 5 +++++
 4 files changed, 9 insertions(+), 1 deletion(-)

-- 
2.20.1