diff mbox series

[v2,04/13] riscv: hwcap: make ISA extension ids can be used in asm

Message ID 20221204174632.3677-5-jszhang@kernel.org (mailing list archive)
State New, archived
Headers show
Series riscv: improve boot time isa extensions handling | expand

Commit Message

Jisheng Zhang Dec. 4, 2022, 5:46 p.m. UTC 
We will make use of ISA extension in asm files, so make the multi-letter
RISC-V ISA extension IDs macros rather than enums and move them and
those base ISA extension IDs to suitable place.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
---
 arch/riscv/include/asm/hwcap.h | 43 ++++++++++++++++------------------
 1 file changed, 20 insertions(+), 23 deletions(-)

Comments

Conor Dooley Dec. 5, 2022, 6:53 p.m. UTC | #1 
Hey Jisheng,

On Mon, Dec 05, 2022 at 01:46:23AM +0800, Jisheng Zhang wrote:
> We will make use of ISA extension in asm files, so make the multi-letter
> RISC-V ISA extension IDs macros rather than enums and move them and
> those base ISA extension IDs to suitable place.

Which base ISA extension IDs? Changelog should match the patch contents,
and it's a little unclear here since the base ISA extension IDs are
visible here but in the context not the diff.

> 
> Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
> Reviewed-by: Heiko Stuebner <heiko@sntech.de>
> Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
> ---
>  arch/riscv/include/asm/hwcap.h | 43 ++++++++++++++++------------------
>  1 file changed, 20 insertions(+), 23 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> index b22525290073..996884986fea 100644
> --- a/arch/riscv/include/asm/hwcap.h
> +++ b/arch/riscv/include/asm/hwcap.h
> @@ -12,20 +12,6 @@
>  #include <linux/bits.h>
>  #include <uapi/asm/hwcap.h>
>  
> -#ifndef __ASSEMBLY__
> -#include <linux/jump_label.h>
> -/*
> - * This yields a mask that user programs can use to figure out what
> - * instruction set this cpu supports.
> - */
> -#define ELF_HWCAP		(elf_hwcap)
> -
> -enum {
> -	CAP_HWCAP = 1,
> -};
> -
> -extern unsigned long elf_hwcap;
> -
>  #define RISCV_ISA_EXT_a		('a' - 'a')
>  #define RISCV_ISA_EXT_c		('c' - 'a')
>  #define RISCV_ISA_EXT_d		('d' - 'a')
> @@ -46,22 +32,33 @@ extern unsigned long elf_hwcap;
>  #define RISCV_ISA_EXT_BASE 26
>  
>  /*
> - * This enum represent the logical ID for each multi-letter RISC-V ISA extension.
> + * These macros represent the logical ID for each multi-letter RISC-V ISA extension.
>   * The logical ID should start from RISCV_ISA_EXT_BASE and must not exceed
>   * RISCV_ISA_EXT_MAX. 0-25 range is reserved for single letter
>   * extensions while all the multi-letter extensions should define the next
>   * available logical extension id.
>   */
> -enum riscv_isa_ext_id {
> -	RISCV_ISA_EXT_SSCOFPMF = RISCV_ISA_EXT_BASE,
> -	RISCV_ISA_EXT_SVPBMT,
> -	RISCV_ISA_EXT_ZICBOM,
> -	RISCV_ISA_EXT_ZIHINTPAUSE,
> -	RISCV_ISA_EXT_SSTC,
> -	RISCV_ISA_EXT_SVINVAL,
> -	RISCV_ISA_EXT_ID_MAX = RISCV_ISA_EXT_MAX,
> +#define RISCV_ISA_EXT_SSCOFPMF		26
> +#define RISCV_ISA_EXT_SVPBMT		27
> +#define RISCV_ISA_EXT_ZICBOM		28
> +#define RISCV_ISA_EXT_ZIHINTPAUSE	29
> +#define RISCV_ISA_EXT_SSTC		30
> +#define RISCV_ISA_EXT_SVINVAL		31

Could you re-order these alphabetically when you move them please?

Thanks,
Conor.

> +
> +#ifndef __ASSEMBLY__
> +#include <linux/jump_label.h>
> +/*
> + * This yields a mask that user programs can use to figure out what
> + * instruction set this cpu supports.
> + */
> +#define ELF_HWCAP		(elf_hwcap)
> +
> +enum {
> +	CAP_HWCAP = 1,
>  };
>  
> +extern unsigned long elf_hwcap;
> +
>  /*
>   * This enum represents the logical ID for each RISC-V ISA extension static
>   * keys. We can use static key to optimize code path if some ISA extensions
> -- 
> 2.37.2
>
Conor Dooley Dec. 22, 2022, 10:58 p.m. UTC | #2 
On Mon, Dec 05, 2022 at 06:53:53PM +0000, Conor Dooley wrote:
> Hey Jisheng,
> 
> On Mon, Dec 05, 2022 at 01:46:23AM +0800, Jisheng Zhang wrote:
> > We will make use of ISA extension in asm files, so make the multi-letter
> > RISC-V ISA extension IDs macros rather than enums and move them and
> > those base ISA extension IDs to suitable place.
> 
> Which base ISA extension IDs? Changelog should match the patch contents,
> and it's a little unclear here since the base ISA extension IDs are
> visible here but in the context not the diff.
> 
> > 
> > Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
> > Reviewed-by: Heiko Stuebner <heiko@sntech.de>
> > Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
> > ---
> >  arch/riscv/include/asm/hwcap.h | 43 ++++++++++++++++------------------
> >  1 file changed, 20 insertions(+), 23 deletions(-)
> > 
> > diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> > index b22525290073..996884986fea 100644
> > --- a/arch/riscv/include/asm/hwcap.h
> > +++ b/arch/riscv/include/asm/hwcap.h
> > @@ -12,20 +12,6 @@
> >  #include <linux/bits.h>
> >  #include <uapi/asm/hwcap.h>
> >  
> > -#ifndef __ASSEMBLY__
> > -#include <linux/jump_label.h>
> > -/*
> > - * This yields a mask that user programs can use to figure out what
> > - * instruction set this cpu supports.
> > - */
> > -#define ELF_HWCAP		(elf_hwcap)
> > -
> > -enum {
> > -	CAP_HWCAP = 1,
> > -};
> > -
> > -extern unsigned long elf_hwcap;
> > -
> >  #define RISCV_ISA_EXT_a		('a' - 'a')
> >  #define RISCV_ISA_EXT_c		('c' - 'a')
> >  #define RISCV_ISA_EXT_d		('d' - 'a')
> > @@ -46,22 +32,33 @@ extern unsigned long elf_hwcap;
> >  #define RISCV_ISA_EXT_BASE 26
> >  
> >  /*
> > - * This enum represent the logical ID for each multi-letter RISC-V ISA extension.
> > + * These macros represent the logical ID for each multi-letter RISC-V ISA extension.
> >   * The logical ID should start from RISCV_ISA_EXT_BASE and must not exceed
> >   * RISCV_ISA_EXT_MAX. 0-25 range is reserved for single letter
> >   * extensions while all the multi-letter extensions should define the next
> >   * available logical extension id.
> >   */
> > -enum riscv_isa_ext_id {
> > -	RISCV_ISA_EXT_SSCOFPMF = RISCV_ISA_EXT_BASE,
> > -	RISCV_ISA_EXT_SVPBMT,
> > -	RISCV_ISA_EXT_ZICBOM,
> > -	RISCV_ISA_EXT_ZIHINTPAUSE,
> > -	RISCV_ISA_EXT_SSTC,
> > -	RISCV_ISA_EXT_SVINVAL,
> > -	RISCV_ISA_EXT_ID_MAX = RISCV_ISA_EXT_MAX,
> > +#define RISCV_ISA_EXT_SSCOFPMF		26
> > +#define RISCV_ISA_EXT_SVPBMT		27
> > +#define RISCV_ISA_EXT_ZICBOM		28
> > +#define RISCV_ISA_EXT_ZIHINTPAUSE	29
> > +#define RISCV_ISA_EXT_SSTC		30
> > +#define RISCV_ISA_EXT_SVINVAL		31
> 
> Could you re-order these alphabetically when you move them please?

On reflection, this is a horrific idea - don't bother. It'd only be
temporary anyway as it'd need massaging when the next extension comes
along.

Either people will have a slightly harder seeing if something is added,
or a "slightly" harder time finding which is the next free number or
have to reshuffle the whole thing.
The latter sounds like a prime bug breeding ground, while the former is
just a search away.
So yeah, don't bother & apologies for the noise!

> > +
> > +#ifndef __ASSEMBLY__
> > +#include <linux/jump_label.h>
> > +/*
> > + * This yields a mask that user programs can use to figure out what
> > + * instruction set this cpu supports.
> > + */
> > +#define ELF_HWCAP		(elf_hwcap)
> > +
> > +enum {
> > +	CAP_HWCAP = 1,
> >  };
> >  
> > +extern unsigned long elf_hwcap;
> > +
> >  /*
> >   * This enum represents the logical ID for each RISC-V ISA extension static
> >   * keys. We can use static key to optimize code path if some ISA extensions
> > -- 
> > 2.37.2
> >
diff mbox series

Patch

diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
index b22525290073..996884986fea 100644
--- a/arch/riscv/include/asm/hwcap.h
+++ b/arch/riscv/include/asm/hwcap.h
@@ -12,20 +12,6 @@ 
 #include <linux/bits.h>
 #include <uapi/asm/hwcap.h>
 
-#ifndef __ASSEMBLY__
-#include <linux/jump_label.h>
-/*
- * This yields a mask that user programs can use to figure out what
- * instruction set this cpu supports.
- */
-#define ELF_HWCAP		(elf_hwcap)
-
-enum {
-	CAP_HWCAP = 1,
-};
-
-extern unsigned long elf_hwcap;
-
 #define RISCV_ISA_EXT_a		('a' - 'a')
 #define RISCV_ISA_EXT_c		('c' - 'a')
 #define RISCV_ISA_EXT_d		('d' - 'a')
@@ -46,22 +32,33 @@  extern unsigned long elf_hwcap;
 #define RISCV_ISA_EXT_BASE 26
 
 /*
- * This enum represent the logical ID for each multi-letter RISC-V ISA extension.
+ * These macros represent the logical ID for each multi-letter RISC-V ISA extension.
  * The logical ID should start from RISCV_ISA_EXT_BASE and must not exceed
  * RISCV_ISA_EXT_MAX. 0-25 range is reserved for single letter
  * extensions while all the multi-letter extensions should define the next
  * available logical extension id.
  */
-enum riscv_isa_ext_id {
-	RISCV_ISA_EXT_SSCOFPMF = RISCV_ISA_EXT_BASE,
-	RISCV_ISA_EXT_SVPBMT,
-	RISCV_ISA_EXT_ZICBOM,
-	RISCV_ISA_EXT_ZIHINTPAUSE,
-	RISCV_ISA_EXT_SSTC,
-	RISCV_ISA_EXT_SVINVAL,
-	RISCV_ISA_EXT_ID_MAX = RISCV_ISA_EXT_MAX,
+#define RISCV_ISA_EXT_SSCOFPMF		26
+#define RISCV_ISA_EXT_SVPBMT		27
+#define RISCV_ISA_EXT_ZICBOM		28
+#define RISCV_ISA_EXT_ZIHINTPAUSE	29
+#define RISCV_ISA_EXT_SSTC		30
+#define RISCV_ISA_EXT_SVINVAL		31
+
+#ifndef __ASSEMBLY__
+#include <linux/jump_label.h>
+/*
+ * This yields a mask that user programs can use to figure out what
+ * instruction set this cpu supports.
+ */
+#define ELF_HWCAP		(elf_hwcap)
+
+enum {
+	CAP_HWCAP = 1,
 };
 
+extern unsigned long elf_hwcap;
+
 /*
  * This enum represents the logical ID for each RISC-V ISA extension static
  * keys. We can use static key to optimize code path if some ISA extensions