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

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Message-Id: <20240702033731.71955-1-cuiyunhui@bytedance.com>
Date: Tue,  2 Jul 2024 11:37:30 +0800
From: Yunhui Cui <cuiyunhui@...edance.com>
To: punit.agrawal@...edance.com,
	sunilvl@...tanamicro.com,
	jesse@...osinc.com,
	jrtc27@...c27.com,
	corbet@....net,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
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	evan@...osinc.com,
	conor.dooley@...rochip.com,
	cuiyunhui@...edance.com,
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	andy.chiu@...ive.com,
	samitolvanen@...gle.com,
	linux-doc@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/1] Provide the frequency of time CSR via hwprobe

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