[PATCH 1/3] powerpc: make CPU selection logic generic in Makefile

[PATCH 1/3] powerpc: make CPU selection logic generic in Makefile

[Christophe Leroy]

At the time being, when adding a new CPU for selection, both
Kconfig.cputype and Makefile have to be modified.

This patch moves into Kconfig.cputype the name of the CPU to me
passed to the -mcpu= argument.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
 arch/powerpc/Makefile                  |  8 +-------
 arch/powerpc/platforms/Kconfig.cputype | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 9704ab360d39..9a5642552abc 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -175,13 +175,7 @@ ifdef CONFIG_MPROFILE_KERNEL
     endif
 endif
 
-CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)
-CFLAGS-$(CONFIG_POWER5_CPU) += $(call cc-option,-mcpu=power5)
-CFLAGS-$(CONFIG_POWER6_CPU) += $(call cc-option,-mcpu=power6)
-CFLAGS-$(CONFIG_POWER7_CPU) += $(call cc-option,-mcpu=power7)
-CFLAGS-$(CONFIG_POWER8_CPU) += $(call cc-option,-mcpu=power8)
-CFLAGS-$(CONFIG_POWER9_CPU) += $(call cc-option,-mcpu=power9)
-CFLAGS-$(CONFIG_PPC_8xx) += $(call cc-option,-mcpu=860)
+CFLAGS-$(CONFIG_SPECIAL_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_SPECIAL_CPU))
 
 # Altivec option not allowed with e500mc64 in GCC.
 ifeq ($(CONFIG_ALTIVEC),y)
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index cc892dcfa114..71ef559cc474 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -140,6 +140,21 @@ config E6500_CPU
 
 endchoice
 
+config SPECIAL_CPU_BOOL
+	bool
+	default !GENERIC_CPU
+
+config SPECIAL_CPU
+	string
+	depends on SPECIAL_CPU_BOOL
+	default "cell" if CELL_CPU
+	default "power5" if POWER5_CPU
+	default "power6" if POWER6_CPU
+	default "power7" if POWER7_CPU
+	default "power8" if POWER8_CPU
+	default "power9" if POWER9_CPU
+	default "860" if PPC_8xx
+
 config PPC_BOOK3S
 	def_bool y
 	depends on PPC_BOOK3S_32 || PPC_BOOK3S_64
-- 
2.13.3

[PATCH 2/3] powerpc: Allow CPU selection also on PPC32

[Christophe Leroy]

This patch extends to PPC32 the capability to select the exact
CPU type.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
 arch/powerpc/platforms/Kconfig.cputype | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 71ef559cc474..ed7c6edec87e 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -86,7 +86,6 @@ endchoice
 
 choice
 	prompt "CPU selection"
-	depends on PPC64
 	default GENERIC_CPU
 	help
 	  This will create a kernel which is optimised for a particular CPU.
@@ -96,13 +95,17 @@ choice
 
 config GENERIC_CPU
 	bool "Generic (POWER4 and above)"
-	depends on !CPU_LITTLE_ENDIAN
+	depends on PPC64 && !CPU_LITTLE_ENDIAN
 
 config GENERIC_CPU
 	bool "Generic (POWER8 and above)"
-	depends on CPU_LITTLE_ENDIAN
+	depends on PPC64 && CPU_LITTLE_ENDIAN
 	select ARCH_HAS_FAST_MULTIPLIER
 
+config GENERIC_CPU
+	bool "Generic 32 bits powerpc"
+	depends on PPC32 && !PPC_8xx
+
 config CELL_CPU
 	bool "Cell Broadband Engine"
 	depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
@@ -138,6 +141,10 @@ config E6500_CPU
 	bool "Freescale e6500"
 	depends on E500
 
+config 860_CPU
+	bool "8xx family"
+	depends on PPC_8xx
+
 endchoice
 
 config SPECIAL_CPU_BOOL
@@ -153,7 +160,7 @@ config SPECIAL_CPU
 	default "power7" if POWER7_CPU
 	default "power8" if POWER8_CPU
 	default "power9" if POWER9_CPU
-	default "860" if PPC_8xx
+	default "860" if 860_CPU
 
 config PPC_BOOK3S
 	def_bool y
-- 
2.13.3

[PATCH 3/3] powerpc: Allow CPU selection of e300core variants

[Christophe Leroy]

GCC supports -mcpu=e300c2 and -mcpu=e300c3

This patch gives the opportunity to tune kernel to one of
those two types.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
 arch/powerpc/platforms/Kconfig.cputype | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index ed7c6edec87e..d174acb41389 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -145,6 +145,14 @@ config 860_CPU
 	bool "8xx family"
 	depends on PPC_8xx
 
+config E300C2_CPU
+	bool "e300c2 (832x)"
+	depends on PPC_BOOK3S_32
+
+config E300C3_CPU
+	bool "e300c3 (831x)"
+	depends on PPC_BOOK3S_32
+
 endchoice
 
 config SPECIAL_CPU_BOOL
@@ -161,6 +169,8 @@ config SPECIAL_CPU
 	default "power8" if POWER8_CPU
 	default "power9" if POWER9_CPU
 	default "860" if 860_CPU
+	default "e300c2" if E300C2_CPU
+	default "e300c3" if E300C3_CPU
 
 config PPC_BOOK3S
 	def_bool y
-- 
2.13.3

Re: [PATCH 1/3] powerpc: make CPU selection logic generic in Makefile

[Nicholas Piggin]

On Thu,  7 Jun 2018 10:10:18 +0000 (UTC)
Christophe Leroy <christophe.leroy@c-s.fr> wrote:

> At the time being, when adding a new CPU for selection, both
> Kconfig.cputype and Makefile have to be modified.
> 
> This patch moves into Kconfig.cputype the name of the CPU to me
> passed to the -mcpu= argument.

Seems like a good cleanup.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

> 
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
> ---
>  arch/powerpc/Makefile                  |  8 +-------
>  arch/powerpc/platforms/Kconfig.cputype | 15 +++++++++++++++
>  2 files changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 9704ab360d39..9a5642552abc 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -175,13 +175,7 @@ ifdef CONFIG_MPROFILE_KERNEL
>      endif
>  endif
>  
> -CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)
> -CFLAGS-$(CONFIG_POWER5_CPU) += $(call cc-option,-mcpu=power5)
> -CFLAGS-$(CONFIG_POWER6_CPU) += $(call cc-option,-mcpu=power6)
> -CFLAGS-$(CONFIG_POWER7_CPU) += $(call cc-option,-mcpu=power7)
> -CFLAGS-$(CONFIG_POWER8_CPU) += $(call cc-option,-mcpu=power8)
> -CFLAGS-$(CONFIG_POWER9_CPU) += $(call cc-option,-mcpu=power9)
> -CFLAGS-$(CONFIG_PPC_8xx) += $(call cc-option,-mcpu=860)
> +CFLAGS-$(CONFIG_SPECIAL_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_SPECIAL_CPU))
>  
>  # Altivec option not allowed with e500mc64 in GCC.
>  ifeq ($(CONFIG_ALTIVEC),y)
> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
> index cc892dcfa114..71ef559cc474 100644
> --- a/arch/powerpc/platforms/Kconfig.cputype
> +++ b/arch/powerpc/platforms/Kconfig.cputype
> @@ -140,6 +140,21 @@ config E6500_CPU
>  
>  endchoice
>  
> +config SPECIAL_CPU_BOOL
> +	bool
> +	default !GENERIC_CPU
> +
> +config SPECIAL_CPU
> +	string
> +	depends on SPECIAL_CPU_BOOL
> +	default "cell" if CELL_CPU
> +	default "power5" if POWER5_CPU
> +	default "power6" if POWER6_CPU
> +	default "power7" if POWER7_CPU
> +	default "power8" if POWER8_CPU
> +	default "power9" if POWER9_CPU
> +	default "860" if PPC_8xx
> +
>  config PPC_BOOK3S
>  	def_bool y
>  	depends on PPC_BOOK3S_32 || PPC_BOOK3S_64

Re: [PATCH 1/3] powerpc: make CPU selection logic generic in Makefile

[Michael Ellerman]

Christophe Leroy <christophe.leroy@c-s.fr> writes:

> At the time being, when adding a new CPU for selection, both
> Kconfig.cputype and Makefile have to be modified.
>
> This patch moves into Kconfig.cputype the name of the CPU to me
> passed to the -mcpu= argument.
>
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
> ---
>  arch/powerpc/Makefile                  |  8 +-------
>  arch/powerpc/platforms/Kconfig.cputype | 15 +++++++++++++++
>  2 files changed, 16 insertions(+), 7 deletions(-)
>
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 9704ab360d39..9a5642552abc 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -175,13 +175,7 @@ ifdef CONFIG_MPROFILE_KERNEL
>      endif
>  endif
>  
> -CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)
> -CFLAGS-$(CONFIG_POWER5_CPU) += $(call cc-option,-mcpu=power5)
> -CFLAGS-$(CONFIG_POWER6_CPU) += $(call cc-option,-mcpu=power6)
> -CFLAGS-$(CONFIG_POWER7_CPU) += $(call cc-option,-mcpu=power7)
> -CFLAGS-$(CONFIG_POWER8_CPU) += $(call cc-option,-mcpu=power8)
> -CFLAGS-$(CONFIG_POWER9_CPU) += $(call cc-option,-mcpu=power9)
> -CFLAGS-$(CONFIG_PPC_8xx) += $(call cc-option,-mcpu=860)
> +CFLAGS-$(CONFIG_SPECIAL_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_SPECIAL_CPU))

This looks good.

I'll rename it from "SPECIAL_CPU" to "TARGET_CPU" because that's the
terminology used in the GCC docs, eg:

    -mcpu=name
           Specify the name of the target processor, optionally suffixed by one or more feature modifiers.


cheers

Re: [1/3] powerpc: make CPU selection logic generic in Makefile

[Michael Ellerman]

On Thu, 2018-06-07 at 10:10:18 UTC, Christophe Leroy wrote:
> At the time being, when adding a new CPU for selection, both
> Kconfig.cputype and Makefile have to be modified.
> 
> This patch moves into Kconfig.cputype the name of the CPU to me
> passed to the -mcpu= argument.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
> Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/cc62d20ce4ca4fe73a09d571144b29

cheers