linux-kernel - Re: [PATCH v2 2/2] RISC-V: hwprobe: Add SCALAR to misaligned perf defines

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Date: Tue, 25 Jun 2024 19:35:43 +0100
From: Conor Dooley <conor@...nel.org>
To: Evan Green <evan@...osinc.com>
Cc: Palmer Dabbelt <palmer@...belt.com>, Yangyu Chen <cyy@...self.name>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Andy Chiu <andy.chiu@...ive.com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Björn Töpel <bjorn@...osinc.com>,
	Charlie Jenkins <charlie@...osinc.com>,
	Clément Léger <cleger@...osinc.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Costa Shulyupin <costa.shul@...hat.com>,
	Erick Archer <erick.archer@....com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Paul Walmsley <paul.walmsley@...ive.com>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 2/2] RISC-V: hwprobe: Add SCALAR to misaligned perf
 defines

On Tue, Jun 25, 2024 at 09:51:21AM -0700, Evan Green wrote:
> In preparation for misaligned vector performance hwprobe keys, rename
> the hwprobe key values associated with misaligned scalar accesses to
> include the term SCALAR.
> 
> Signed-off-by: Evan Green <evan@...osinc.com>
> 
> ---
> 
> Changes in v2:
>  - Added patch to rename misaligned perf key values (Palmer)
> 
>  Documentation/arch/riscv/hwprobe.rst       | 20 ++++++++++----------
>  arch/riscv/include/uapi/asm/hwprobe.h      | 10 +++++-----
>  arch/riscv/kernel/sys_hwprobe.c            | 10 +++++-----
>  arch/riscv/kernel/traps_misaligned.c       |  6 +++---
>  arch/riscv/kernel/unaligned_access_speed.c | 12 ++++++------
>  5 files changed, 29 insertions(+), 29 deletions(-)
> 
> diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
> index c9f570b1ab60..83f7f3c1347f 100644
> --- a/Documentation/arch/riscv/hwprobe.rst
> +++ b/Documentation/arch/riscv/hwprobe.rst
> @@ -215,22 +215,22 @@ The following keys are defined:
>    the performance of misaligned scalar word accesses on the selected set of
>    processors.
>  
> -  * :c:macro:`RISCV_HWPROBE_MISALIGNED_UNKNOWN`: The performance of misaligned
> -    accesses is unknown.
> +  * :c:macro:`RISCV_HWPROBE_MISALIGNED_SCALAR_UNKNOWN`: The performance of
> +    misaligned accesses is unknown.
>  
> -  * :c:macro:`RISCV_HWPROBE_MISALIGNED_EMULATED`: Misaligned accesses are
> +  * :c:macro:`RISCV_HWPROBE_MISALIGNED_SCALAR_EMULATED`: Misaligned accesses are
>      emulated via software, either in or below the kernel.  These accesses are
>      always extremely slow.
>  
> -  * :c:macro:`RISCV_HWPROBE_MISALIGNED_SLOW`: Misaligned word accesses are
> -    slower than equivalent byte accesses.  Misaligned accesses may be supported
> -    directly in hardware, or trapped and emulated by software.
> +  * :c:macro:`RISCV_HWPROBE_MISALIGNED_SCALAR_SLOW`: Misaligned word accesses
> +    are slower than equivalent byte accesses.  Misaligned accesses may be
> +    supported directly in hardware, or trapped and emulated by software.
>  
> -  * :c:macro:`RISCV_HWPROBE_MISALIGNED_FAST`: Misaligned word accesses are
> -    faster than equivalent byte accesses.
> +  * :c:macro:`RISCV_HWPROBE_MISALIGNED_SCALAR_FAST`: Misaligned word accesses
> +    are faster than equivalent byte accesses.
>  
> -  * :c:macro:`RISCV_HWPROBE_MISALIGNED_UNSUPPORTED`: Misaligned accesses are
> -    not supported at all and will generate a misaligned address fault.
> +  * :c:macro:`RISCV_HWPROBE_MISALIGNED_SCALAR_UNSUPPORTED`: Misaligned accesses
> +    are not supported at all and will generate a misaligned address fault.
>  
>  * :c:macro:`RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE`: An unsigned int which
>    represents the size of the Zicboz block in bytes.
> diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h
> index 22073533cea8..e11684d8ae1c 100644
> --- a/arch/riscv/include/uapi/asm/hwprobe.h
> +++ b/arch/riscv/include/uapi/asm/hwprobe.h
> @@ -66,11 +66,11 @@ struct riscv_hwprobe {
>  #define		RISCV_HWPROBE_EXT_ZVE64F	(1ULL << 40)
>  #define		RISCV_HWPROBE_EXT_ZVE64D	(1ULL << 41)
>  #define RISCV_HWPROBE_KEY_CPUPERF_0	5
> -#define		RISCV_HWPROBE_MISALIGNED_UNKNOWN	0
> -#define		RISCV_HWPROBE_MISALIGNED_EMULATED	1
> -#define		RISCV_HWPROBE_MISALIGNED_SLOW		2
> -#define		RISCV_HWPROBE_MISALIGNED_FAST		3
> -#define		RISCV_HWPROBE_MISALIGNED_UNSUPPORTED	4
> +#define		RISCV_HWPROBE_MISALIGNED_SCALAR_UNKNOWN		0
> +#define		RISCV_HWPROBE_MISALIGNED_SCALAR_EMULATED	1
> +#define		RISCV_HWPROBE_MISALIGNED_SCALAR_SLOW		2
> +#define		RISCV_HWPROBE_MISALIGNED_SCALAR_FAST		3
> +#define		RISCV_HWPROBE_MISALIGNED_SCALAR_UNSUPPORTED	4
>  #define		RISCV_HWPROBE_MISALIGNED_MASK		7

How come the "old" names do not need to be preserved for userspace?

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