diff mbox series

[1/2] RISC-V: Detect and Enable Svadu Extension Support

Message ID 20230915082701.3643-2-yongxuan.wang@sifive.com (mailing list archive)
State Superseded
Headers show
Series Add Svadu Extension Support | expand

Commit Message

Yong-Xuan Wang Sept. 15, 2023, 8:26 a.m. UTC 
We detect Svadu extension support from DTB and add arch_has_hw_pte_young()
to enable optimization in MGLRU and __wp_page_copy_user() if Svadu
extension is available.

Signed-off-by: Jinyu Tang <tjytimi@163.com>
Signed-off-by: Yong-Xuan Wang <yongxuan.wang@sifive.com>
---
 arch/riscv/include/asm/csr.h     | 1 +
 arch/riscv/include/asm/hwcap.h   | 1 +
 arch/riscv/include/asm/pgtable.h | 6 ++++++
 arch/riscv/kernel/cpufeature.c   | 1 +
 4 files changed, 9 insertions(+)

Comments

Conor Dooley Sept. 15, 2023, 8:45 a.m. UTC | #1 
On Fri, Sep 15, 2023 at 08:26:57AM +0000, Yong-Xuan Wang wrote:
> We detect Svadu extension support from DTB and add arch_has_hw_pte_young()
> to enable optimization in MGLRU and __wp_page_copy_user() if Svadu
> extension is available.
> 
> Signed-off-by: Jinyu Tang <tjytimi@163.com>

You're either missing a From: or a Co-developed-by: tag here.

> Signed-off-by: Yong-Xuan Wang <yongxuan.wang@sifive.com>
> ---
>  arch/riscv/include/asm/csr.h     | 1 +
>  arch/riscv/include/asm/hwcap.h   | 1 +
>  arch/riscv/include/asm/pgtable.h | 6 ++++++
>  arch/riscv/kernel/cpufeature.c   | 1 +
>  4 files changed, 9 insertions(+)
> 
> diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
> index 777cb8299551..10648b372a2a 100644
> --- a/arch/riscv/include/asm/csr.h
> +++ b/arch/riscv/include/asm/csr.h
> @@ -194,6 +194,7 @@
>  /* xENVCFG flags */
>  #define ENVCFG_STCE			(_AC(1, ULL) << 63)
>  #define ENVCFG_PBMTE			(_AC(1, ULL) << 62)
> +#define ENVCFG_HADE			(_AC(1, ULL) << 61)
>  #define ENVCFG_CBZE			(_AC(1, UL) << 7)
>  #define ENVCFG_CBCFE			(_AC(1, UL) << 6)
>  #define ENVCFG_CBIE_SHIFT		4
> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> index b7b58258f6c7..1013661d6516 100644
> --- a/arch/riscv/include/asm/hwcap.h
> +++ b/arch/riscv/include/asm/hwcap.h
> @@ -58,6 +58,7 @@
>  #define RISCV_ISA_EXT_ZICSR		40
>  #define RISCV_ISA_EXT_ZIFENCEI		41
>  #define RISCV_ISA_EXT_ZIHPM		42
> +#define RISCV_ISA_EXT_SVADU		43
>  
>  #define RISCV_ISA_EXT_MAX		64
>  
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index b2ba3f79cfe9..f3d077dff8ac 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -629,6 +629,12 @@ static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
>  	return __pgprot(prot);
>  }
>  
> +#define arch_has_hw_pte_young arch_has_hw_pte_young
> +static inline bool arch_has_hw_pte_young(void)
> +{
> +	return riscv_has_extension_likely(RISCV_ISA_EXT_SVADU);

No hardware currently has this, why is it likely?

> +}
> +
>  /*
>   * THP functions
>   */
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index 1cfbba65d11a..ead378c04991 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -178,6 +178,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
>  	__RISCV_ISA_EXT_DATA(ssaia, RISCV_ISA_EXT_SSAIA),
>  	__RISCV_ISA_EXT_DATA(sscofpmf, RISCV_ISA_EXT_SSCOFPMF),
>  	__RISCV_ISA_EXT_DATA(sstc, RISCV_ISA_EXT_SSTC),
> +	__RISCV_ISA_EXT_DATA(svadu, RISCV_ISA_EXT_SVADU),

This needs to be documented in riscv/extensions.yaml.

Thanks,
Conor.

>  	__RISCV_ISA_EXT_DATA(svinval, RISCV_ISA_EXT_SVINVAL),
>  	__RISCV_ISA_EXT_DATA(svnapot, RISCV_ISA_EXT_SVNAPOT),
>  	__RISCV_ISA_EXT_DATA(svpbmt, RISCV_ISA_EXT_SVPBMT),
> -- 
> 2.17.1
>
Yong-Xuan Wang Sept. 20, 2023, 3:49 a.m. UTC | #2 
Hi Conor,

On Fri, Sep 15, 2023 at 4:45 PM Conor Dooley <conor.dooley@microchip.com> wrote:
>
> On Fri, Sep 15, 2023 at 08:26:57AM +0000, Yong-Xuan Wang wrote:
> > We detect Svadu extension support from DTB and add arch_has_hw_pte_young()
> > to enable optimization in MGLRU and __wp_page_copy_user() if Svadu
> > extension is available.
> >
> > Signed-off-by: Jinyu Tang <tjytimi@163.com>
>
> You're either missing a From: or a Co-developed-by: tag here.
>
> > Signed-off-by: Yong-Xuan Wang <yongxuan.wang@sifive.com>
> > ---
> >  arch/riscv/include/asm/csr.h     | 1 +
> >  arch/riscv/include/asm/hwcap.h   | 1 +
> >  arch/riscv/include/asm/pgtable.h | 6 ++++++
> >  arch/riscv/kernel/cpufeature.c   | 1 +
> >  4 files changed, 9 insertions(+)
> >
> > diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
> > index 777cb8299551..10648b372a2a 100644
> > --- a/arch/riscv/include/asm/csr.h
> > +++ b/arch/riscv/include/asm/csr.h
> > @@ -194,6 +194,7 @@
> >  /* xENVCFG flags */
> >  #define ENVCFG_STCE                  (_AC(1, ULL) << 63)
> >  #define ENVCFG_PBMTE                 (_AC(1, ULL) << 62)
> > +#define ENVCFG_HADE                  (_AC(1, ULL) << 61)
> >  #define ENVCFG_CBZE                  (_AC(1, UL) << 7)
> >  #define ENVCFG_CBCFE                 (_AC(1, UL) << 6)
> >  #define ENVCFG_CBIE_SHIFT            4
> > diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> > index b7b58258f6c7..1013661d6516 100644
> > --- a/arch/riscv/include/asm/hwcap.h
> > +++ b/arch/riscv/include/asm/hwcap.h
> > @@ -58,6 +58,7 @@
> >  #define RISCV_ISA_EXT_ZICSR          40
> >  #define RISCV_ISA_EXT_ZIFENCEI               41
> >  #define RISCV_ISA_EXT_ZIHPM          42
> > +#define RISCV_ISA_EXT_SVADU          43
> >
> >  #define RISCV_ISA_EXT_MAX            64
> >
> > diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> > index b2ba3f79cfe9..f3d077dff8ac 100644
> > --- a/arch/riscv/include/asm/pgtable.h
> > +++ b/arch/riscv/include/asm/pgtable.h
> > @@ -629,6 +629,12 @@ static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
> >       return __pgprot(prot);
> >  }
> >
> > +#define arch_has_hw_pte_young arch_has_hw_pte_young
> > +static inline bool arch_has_hw_pte_young(void)
> > +{
> > +     return riscv_has_extension_likely(RISCV_ISA_EXT_SVADU);
>
> No hardware currently has this, why is it likely?
>
> > +}
> > +
> >  /*
> >   * THP functions
> >   */
> > diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> > index 1cfbba65d11a..ead378c04991 100644
> > --- a/arch/riscv/kernel/cpufeature.c
> > +++ b/arch/riscv/kernel/cpufeature.c
> > @@ -178,6 +178,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
> >       __RISCV_ISA_EXT_DATA(ssaia, RISCV_ISA_EXT_SSAIA),
> >       __RISCV_ISA_EXT_DATA(sscofpmf, RISCV_ISA_EXT_SSCOFPMF),
> >       __RISCV_ISA_EXT_DATA(sstc, RISCV_ISA_EXT_SSTC),
> > +     __RISCV_ISA_EXT_DATA(svadu, RISCV_ISA_EXT_SVADU),
>
> This needs to be documented in riscv/extensions.yaml.
>

Thank you! I will update these in v2 patch.

Regards,
Yong-Xuan

> Thanks,
> Conor.
>
> >       __RISCV_ISA_EXT_DATA(svinval, RISCV_ISA_EXT_SVINVAL),
> >       __RISCV_ISA_EXT_DATA(svnapot, RISCV_ISA_EXT_SVNAPOT),
> >       __RISCV_ISA_EXT_DATA(svpbmt, RISCV_ISA_EXT_SVPBMT),
> > --
> > 2.17.1
> >
diff mbox series

Patch

diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
index 777cb8299551..10648b372a2a 100644
--- a/arch/riscv/include/asm/csr.h
+++ b/arch/riscv/include/asm/csr.h
@@ -194,6 +194,7 @@ 
 /* xENVCFG flags */
 #define ENVCFG_STCE			(_AC(1, ULL) << 63)
 #define ENVCFG_PBMTE			(_AC(1, ULL) << 62)
+#define ENVCFG_HADE			(_AC(1, ULL) << 61)
 #define ENVCFG_CBZE			(_AC(1, UL) << 7)
 #define ENVCFG_CBCFE			(_AC(1, UL) << 6)
 #define ENVCFG_CBIE_SHIFT		4
diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
index b7b58258f6c7..1013661d6516 100644
--- a/arch/riscv/include/asm/hwcap.h
+++ b/arch/riscv/include/asm/hwcap.h
@@ -58,6 +58,7 @@ 
 #define RISCV_ISA_EXT_ZICSR		40
 #define RISCV_ISA_EXT_ZIFENCEI		41
 #define RISCV_ISA_EXT_ZIHPM		42
+#define RISCV_ISA_EXT_SVADU		43
 
 #define RISCV_ISA_EXT_MAX		64
 
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index b2ba3f79cfe9..f3d077dff8ac 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -629,6 +629,12 @@  static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
 	return __pgprot(prot);
 }
 
+#define arch_has_hw_pte_young arch_has_hw_pte_young
+static inline bool arch_has_hw_pte_young(void)
+{
+	return riscv_has_extension_likely(RISCV_ISA_EXT_SVADU);
+}
+
 /*
  * THP functions
  */
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 1cfbba65d11a..ead378c04991 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -178,6 +178,7 @@  const struct riscv_isa_ext_data riscv_isa_ext[] = {
 	__RISCV_ISA_EXT_DATA(ssaia, RISCV_ISA_EXT_SSAIA),
 	__RISCV_ISA_EXT_DATA(sscofpmf, RISCV_ISA_EXT_SSCOFPMF),
 	__RISCV_ISA_EXT_DATA(sstc, RISCV_ISA_EXT_SSTC),
+	__RISCV_ISA_EXT_DATA(svadu, RISCV_ISA_EXT_SVADU),
 	__RISCV_ISA_EXT_DATA(svinval, RISCV_ISA_EXT_SVINVAL),
 	__RISCV_ISA_EXT_DATA(svnapot, RISCV_ISA_EXT_SVNAPOT),
 	__RISCV_ISA_EXT_DATA(svpbmt, RISCV_ISA_EXT_SVPBMT),