[Buildroot] [PATCH 0/5] arch/arm: introduce big.LITTLE configurations

[Buildroot] [PATCH 0/5] arch/arm: introduce big.LITTLE configurations

[Yann E. MORIN]

Hello All!

This series adds four new CPU variants to the arm choice, to enable
optimising for big.LITTLE CPUs.

We first fix the current values inthe first two patches, then introduce
the actual new variants, and then make use of the sole packages that
needs to know of them.

This has been only slightly tested by simply building the toolchains for
the six possibilities:
  - the four variants in arm mode (32-bit),
  - the two armv8 variants in aarch64 mode (64-bit).

The variants were introduced in various versions of gcc, so we protect
the internal gcc as well as the external toolchains accordingly.


Regards,
Yann E. MORIN.


The following changes since commit 644c024edeb7e20bd96ce4426aeca2cbcd74d9b9

  syslinux: drop patch 0003, not needed after gnu-efi update (2017-07-04 18:45:26 +0200)


are available in the git repository at:

  git://git.buildroot.org/~ymorin/git/buildroot.git

for you to fetch changes up to cdc5ada0fd19765aff9779fc109a26284c9320b6

  package/kvm-unit-test: available for big.LITTLE arm cores too (2017-07-05 12:07:49 +0200)


----------------------------------------------------------------
Yann E. MORIN (5):
      arch/arm: fix -mcpu default values for AArch64
      arch/arm: fix defaults for AArch64 in 64-bit mode
      package/kvm-unit-tests: introduce _ARCH_SUPPORTS
      arch/arm: add big.LITTLE cpu variants
      package/kvm-unit-test: available for big.LITTLE arm cores too

 arch/Config.in.arm                                 | 50 ++++++++++++++++++----
 package/gcc/Config.in.host                         |  5 ++-
 package/kvm-unit-tests/Config.in                   | 19 ++++----
 .../Config.in                                      |  2 +
 .../toolchain-external-codesourcery-arm/Config.in  |  4 ++
 5 files changed, 62 insertions(+), 18 deletions(-)

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
| +33 223 225 172 `------------.-------:  X  AGAINST      |  \e/  There is no  |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
'------------------------------^-------^------------------^--------------------'

[Buildroot] [PATCH 1/5] arch/arm: fix -mcpu default values for AArch64

[Yann E. MORIN]

For AArch64, +fp and +simd are the default, so they are totally useless.

Remove them.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 arch/Config.in.arm | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/arch/Config.in.arm b/arch/Config.in.arm
index b1817ed568..aaf4506d7f 100644
--- a/arch/Config.in.arm
+++ b/arch/Config.in.arm
@@ -535,14 +535,8 @@ config BR2_GCC_TARGET_CPU
 	default "xscale"	if BR2_xscale
 	default "iwmmxt"	if BR2_iwmmxt
 	default "cortex-a53"		if (BR2_cortex_a53 && !BR2_ARCH_IS_64)
-	default "cortex-a53+fp"		if (BR2_cortex_a53 && BR2_ARCH_IS_64 && BR2_ARM_FPU_FP_ARMV8)
-	default "cortex-a53+fp+simd"	if (BR2_cortex_a53 && BR2_ARCH_IS_64 && BR2_ARM_FPU_NEON_FP_ARMV8)
 	default "cortex-a57"		if (BR2_cortex_a57 && !BR2_ARCH_IS_64)
-	default "cortex-a57+fp"		if (BR2_cortex_a57 && BR2_ARCH_IS_64 && BR2_ARM_FPU_FP_ARMV8)
-	default "cortex-a57+fp+simd"	if (BR2_cortex_a57 && BR2_ARCH_IS_64 && BR2_ARM_FPU_NEON_FP_ARMV8)
 	default "cortex-a72"		if (BR2_cortex_a72 && !BR2_ARCH_IS_64)
-	default "cortex-a72+fp"		if (BR2_cortex_a72 && BR2_ARCH_IS_64 && BR2_ARM_FPU_FP_ARMV8)
-	default "cortex-a72+fp+simd"	if (BR2_cortex_a72 && BR2_ARCH_IS_64 && BR2_ARM_FPU_NEON_FP_ARMV8)
 
 config BR2_GCC_TARGET_ABI
 	default "aapcs-linux"	if BR2_arm || BR2_armeb
-- 
2.11.0

[Buildroot] [PATCH 2/5] arch/arm: fix defaults for AArch64 in 64-bit mode

[Yann E. MORIN]

Even in 64-bit mode we have to specify the -mcpu value.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 arch/Config.in.arm | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/Config.in.arm b/arch/Config.in.arm
index aaf4506d7f..e6beacf3d8 100644
--- a/arch/Config.in.arm
+++ b/arch/Config.in.arm
@@ -534,9 +534,9 @@ config BR2_GCC_TARGET_CPU
 	default "strongarm"	if BR2_strongarm
 	default "xscale"	if BR2_xscale
 	default "iwmmxt"	if BR2_iwmmxt
-	default "cortex-a53"		if (BR2_cortex_a53 && !BR2_ARCH_IS_64)
-	default "cortex-a57"		if (BR2_cortex_a57 && !BR2_ARCH_IS_64)
-	default "cortex-a72"		if (BR2_cortex_a72 && !BR2_ARCH_IS_64)
+	default "cortex-a53"		if (BR2_cortex_a53)
+	default "cortex-a57"		if (BR2_cortex_a57)
+	default "cortex-a72"		if (BR2_cortex_a72)
 
 config BR2_GCC_TARGET_ABI
 	default "aapcs-linux"	if BR2_arm || BR2_armeb
-- 
2.11.0

[Buildroot] [PATCH 3/5] package/kvm-unit-tests: introduce _ARCH_SUPPORTS

[Yann E. MORIN]

Move all architecture options to their own symbol, so that it is easier
to add more variants in the future.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Cyril Bur <cyrilbur@gmail.com>
---
 package/kvm-unit-tests/Config.in | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/package/kvm-unit-tests/Config.in b/package/kvm-unit-tests/Config.in
index 7eab0c25d6..0283e97dfc 100644
--- a/package/kvm-unit-tests/Config.in
+++ b/package/kvm-unit-tests/Config.in
@@ -1,15 +1,17 @@
-config BR2_PACKAGE_KVM_UNIT_TESTS
-	bool "kvm-unit-tests"
+config BR2_PACKAGE_KVM_UNIT_TESTS_ARCH_SUPPORTS
+	bool
+	default y if BR2_cortex_a7 || BR2_cortex_a12 || \
+		BR2_cortex_a15 || BR2_cortex_a17
+	default y if BR2_powerpc64 || BR2_powerpc64le
 	# on i386 and x86-64, __builtin_reachable is used, so we need
 	# gcc 4.5 at least. on i386, we use the target gcc, while on
 	# x86-64 we use the host gcc (see .mk file for details)
 	# On ARM, it uses virtualization extensions
-	depends on BR2_cortex_a7 || BR2_cortex_a12 || \
-		BR2_cortex_a15 || BR2_cortex_a17 || \
-		(BR2_i386 && BR2_TOOLCHAIN_GCC_AT_LEAST_4_5) || \
-		BR2_powerpc64 || \
-		BR2_powerpc64le || \
-		(BR2_x86_64 && BR2_HOST_GCC_AT_LEAST_4_5)
+	default y if (BR2_i386 || BR2_x86_64) && BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
+
+config BR2_PACKAGE_KVM_UNIT_TESTS
+	bool "kvm-unit-tests"
+	depends on BR2_PACKAGE_KVM_UNIT_TESTS_ARCH_SUPPORTS
 	select BR2_HOSTARCH_NEEDS_IA32_COMPILER if BR2_x86_64=y
 	help
 	  kvm-unit-tests is a project as old as KVM. As its name
-- 
2.11.0

[Buildroot] [PATCH 4/5] arch/arm: add big.LITTLE cpu variants

[Yann E. MORIN]

The big.LITTLE configurations can be optimised for by gcc, and a few
users wonder what they should choose when they have such CPUs.

Add new entries for those big.LITTLE configurations.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Thomas De Schampheleire <patrickdepinguin@gmail.com>
---
 arch/Config.in.arm                                 | 38 ++++++++++++++++++++++
 package/gcc/Config.in.host                         |  5 ++-
 .../Config.in                                      |  2 ++
 .../toolchain-external-codesourcery-arm/Config.in  |  4 +++
 4 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/arch/Config.in.arm b/arch/Config.in.arm
index e6beacf3d8..5ca536684f 100644
--- a/arch/Config.in.arm
+++ b/arch/Config.in.arm
@@ -182,6 +182,15 @@ config BR2_cortex_a15
 	select BR2_ARM_CPU_ARMV7A
 	select BR2_ARCH_HAS_MMU_OPTIONAL
 	depends on !BR2_ARCH_IS_64
+config BR2_cortex_a15_a7
+	bool "cortex-A15/A7 big.LITTLE"
+	select BR2_ARM_CPU_HAS_ARM
+	select BR2_ARM_CPU_HAS_NEON
+	select BR2_ARM_CPU_HAS_VFPV4
+	select BR2_ARM_CPU_HAS_THUMB2
+	select BR2_ARM_CPU_ARMV7A
+	select BR2_ARCH_HAS_MMU_OPTIONAL
+	depends on !BR2_ARCH_IS_64
 config BR2_cortex_a17
 	bool "cortex-A17"
 	select BR2_ARM_CPU_HAS_ARM
@@ -191,6 +200,15 @@ config BR2_cortex_a17
 	select BR2_ARM_CPU_ARMV7A
 	select BR2_ARCH_HAS_MMU_OPTIONAL
 	depends on !BR2_ARCH_IS_64
+config BR2_cortex_a17_a7
+	bool "cortex-A17/A7 big.LITTLE"
+	select BR2_ARM_CPU_HAS_ARM
+	select BR2_ARM_CPU_HAS_NEON
+	select BR2_ARM_CPU_HAS_VFPV4
+	select BR2_ARM_CPU_HAS_THUMB2
+	select BR2_ARM_CPU_ARMV7A
+	select BR2_ARCH_HAS_MMU_OPTIONAL
+	depends on !BR2_ARCH_IS_64
 config BR2_cortex_a53
 	bool "cortex-A53"
 	select BR2_ARM_CPU_HAS_ARM if !BR2_ARCH_IS_64
@@ -207,6 +225,14 @@ config BR2_cortex_a57
 	select BR2_ARM_CPU_HAS_FP_ARMV8
 	select BR2_ARM_CPU_ARMV8
 	select BR2_ARCH_HAS_MMU_OPTIONAL
+config BR2_cortex_a57_a53
+	bool "cortex-A57/A53 big.LITTLE"
+	select BR2_ARM_CPU_HAS_ARM if !BR2_ARCH_IS_64
+	select BR2_ARM_CPU_HAS_NEON if !BR2_ARCH_IS_64
+	select BR2_ARM_CPU_HAS_THUMB2 if !BR2_ARCH_IS_64
+	select BR2_ARM_CPU_HAS_FP_ARMV8
+	select BR2_ARM_CPU_ARMV8
+	select BR2_ARCH_HAS_MMU_OPTIONAL
 config BR2_cortex_a72
 	bool "cortex-A72"
 	select BR2_ARM_CPU_HAS_ARM if !BR2_ARCH_IS_64
@@ -215,6 +241,14 @@ config BR2_cortex_a72
 	select BR2_ARM_CPU_HAS_FP_ARMV8
 	select BR2_ARM_CPU_ARMV8
 	select BR2_ARCH_HAS_MMU_OPTIONAL
+config BR2_cortex_a72_a53
+	bool "cortex-A72/A53 big.LITTLE"
+	select BR2_ARM_CPU_HAS_ARM if !BR2_ARCH_IS_64
+	select BR2_ARM_CPU_HAS_NEON if !BR2_ARCH_IS_64
+	select BR2_ARM_CPU_HAS_THUMB2 if !BR2_ARCH_IS_64
+	select BR2_ARM_CPU_HAS_FP_ARMV8
+	select BR2_ARM_CPU_ARMV8
+	select BR2_ARCH_HAS_MMU_OPTIONAL
 config BR2_cortex_m3
 	bool "cortex-M3"
 	select BR2_ARM_CPU_HAS_THUMB2
@@ -526,7 +560,9 @@ config BR2_GCC_TARGET_CPU
 	default "cortex-a9"	if BR2_cortex_a9
 	default "cortex-a12"	if BR2_cortex_a12
 	default "cortex-a15"	if BR2_cortex_a15
+	default "cortex-a15.cortex-a7"	if BR2_cortex_a15_a7
 	default "cortex-a17"	if BR2_cortex_a17
+	default "cortex-a17.cortex-a7"	if BR2_cortex_a17_a7
 	default "cortex-m3"	if BR2_cortex_m3
 	default "cortex-m4"	if BR2_cortex_m4
 	default "fa526"		if BR2_fa526
@@ -536,7 +572,9 @@ config BR2_GCC_TARGET_CPU
 	default "iwmmxt"	if BR2_iwmmxt
 	default "cortex-a53"		if (BR2_cortex_a53)
 	default "cortex-a57"		if (BR2_cortex_a57)
+	default "cortex-a57.cortex-a53"	if (BR2_cortex_a57_a53)
 	default "cortex-a72"		if (BR2_cortex_a72)
+	default "cortex-a72.cortex-a53"	if (BR2_cortex_a72_a53)
 
 config BR2_GCC_TARGET_ABI
 	default "aapcs-linux"	if BR2_arm || BR2_armeb
diff --git a/package/gcc/Config.in.host b/package/gcc/Config.in.host
index 5dcaa03ff0..c072b78ae5 100644
--- a/package/gcc/Config.in.host
+++ b/package/gcc/Config.in.host
@@ -25,7 +25,8 @@ config BR2_GCC_VERSION_4_9_X
 	# Broken or unsupported architectures
 	depends on !BR2_arc && !BR2_bfin && !BR2_or1k
 	# Broken or unsupported ARM cores
-	depends on !BR2_cortex_a17 && !BR2_cortex_a72
+	depends on !BR2_cortex_a17 && !BR2_cortex_a17_a7
+	depends on !BR2_cortex_a72 && !BR2_cortex_a72_a53
 	# Unsupported MIPS cores
 	depends on !BR2_mips_interaptiv
 	# Unsupported for MIPS R5
@@ -45,6 +46,8 @@ config BR2_GCC_VERSION_5_X
 	bool "gcc 5.x"
 	# Broken or unsupported architectures
 	depends on !BR2_arc && !BR2_bfin && !BR2_or1k
+	# Broken or unsupported ARM cores
+	depends on !BR2_cortex_a57_a53 && !BR2_cortex_a72_a53
 	# musl ppc64 unsupported
 	depends on !(BR2_TOOLCHAIN_USES_MUSL && (BR2_powerpc64 || BR2_powerpc64le))
 	# Unsupported MIPS cores
diff --git a/toolchain/toolchain-external/toolchain-external-codesourcery-aarch64/Config.in b/toolchain/toolchain-external/toolchain-external-codesourcery-aarch64/Config.in
index 2fbb218ecc..66a032e9ac 100644
--- a/toolchain/toolchain-external/toolchain-external-codesourcery-aarch64/Config.in
+++ b/toolchain/toolchain-external/toolchain-external-codesourcery-aarch64/Config.in
@@ -1,6 +1,8 @@
 config BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_AARCH64
 	bool "CodeSourcery AArch64 2014.11"
 	depends on BR2_aarch64
+	# a57/a53 and a72/a53 appeared in gcc-6 or were broken before
+	depends on !BR2_cortex_a57_a53 && !BR2_cortex_a72_a53
 	depends on BR2_HOSTARCH = "x86_64" || BR2_HOSTARCH = "x86"
 	depends on !BR2_STATIC_LIBS
 	select BR2_TOOLCHAIN_EXTERNAL_GLIBC
diff --git a/toolchain/toolchain-external/toolchain-external-codesourcery-arm/Config.in b/toolchain/toolchain-external/toolchain-external-codesourcery-arm/Config.in
index 6331873dbd..70c488d327 100644
--- a/toolchain/toolchain-external/toolchain-external-codesourcery-arm/Config.in
+++ b/toolchain/toolchain-external/toolchain-external-codesourcery-arm/Config.in
@@ -1,6 +1,10 @@
 config BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_ARM
 	bool "Sourcery CodeBench ARM 2014.05"
 	depends on BR2_arm
+	# a15/a7 appeared in gcc-4.9, a17/a7 in gcc-5, a57/a53 and a72/a53
+	# in gcc-6, or they were broken earlier than that.
+	depends on !BR2_cortex_a15_a7 && !BR2_cortex_a17_a7
+	depends on !BR2_cortex_a57_53 && !BR2_cortex_a72_53
 	depends on BR2_HOSTARCH = "x86_64" || BR2_HOSTARCH = "x86"
 	depends on BR2_ARM_EABI
 	# Unsupported ARM cores
-- 
2.11.0

[Buildroot] [PATCH 5/5] package/kvm-unit-test: available for big.LITTLE arm cores too

[Yann E. MORIN]

Since it supports each variants individually, it should also supports
the big.LITTLE configurations.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Cyril Bur <cyrilbur@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 package/kvm-unit-tests/Config.in | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/package/kvm-unit-tests/Config.in b/package/kvm-unit-tests/Config.in
index 0283e97dfc..ec1826b2da 100644
--- a/package/kvm-unit-tests/Config.in
+++ b/package/kvm-unit-tests/Config.in
@@ -1,7 +1,8 @@
 config BR2_PACKAGE_KVM_UNIT_TESTS_ARCH_SUPPORTS
 	bool
 	default y if BR2_cortex_a7 || BR2_cortex_a12 || \
-		BR2_cortex_a15 || BR2_cortex_a17
+		BR2_cortex_a15 || BR2_cortex_a17 || \
+		BR2_cortex_a15_a7 || BR2_cortex_a17_a7
 	default y if BR2_powerpc64 || BR2_powerpc64le
 	# on i386 and x86-64, __builtin_reachable is used, so we need
 	# gcc 4.5 at least. on i386, we use the target gcc, while on
-- 
2.11.0

[Buildroot] [PATCH 2/5] arch/arm: fix defaults for AArch64 in 64-bit mode

[Baruch Siach]

Hi Yann,

On Wed, Jul 05, 2017 at 12:25:34PM +0200, Yann E. MORIN wrote:
> Even in 64-bit mode we have to specify the -mcpu value.
> 
> Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> ---
>  arch/Config.in.arm | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/Config.in.arm b/arch/Config.in.arm
> index aaf4506d7f..e6beacf3d8 100644
> --- a/arch/Config.in.arm
> +++ b/arch/Config.in.arm
> @@ -534,9 +534,9 @@ config BR2_GCC_TARGET_CPU
>  	default "strongarm"	if BR2_strongarm
>  	default "xscale"	if BR2_xscale
>  	default "iwmmxt"	if BR2_iwmmxt
> -	default "cortex-a53"		if (BR2_cortex_a53 && !BR2_ARCH_IS_64)
> -	default "cortex-a57"		if (BR2_cortex_a57 && !BR2_ARCH_IS_64)
> -	default "cortex-a72"		if (BR2_cortex_a72 && !BR2_ARCH_IS_64)
> +	default "cortex-a53"		if (BR2_cortex_a53)
> +	default "cortex-a57"		if (BR2_cortex_a57)
> +	default "cortex-a72"		if (BR2_cortex_a72)

What are the parentheses good for?

baruch

>  
>  config BR2_GCC_TARGET_ABI
>  	default "aapcs-linux"	if BR2_arm || BR2_armeb

-- 
     http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
   - baruch at tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -

[Buildroot] [PATCH 2/5] arch/arm: fix defaults for AArch64 in 64-bit mode

[Yann E. MORIN]

Baruch, All,

On 2017-07-05 13:55 +0300, Baruch Siach spake thusly:
> On Wed, Jul 05, 2017 at 12:25:34PM +0200, Yann E. MORIN wrote:
> > Even in 64-bit mode we have to specify the -mcpu value.
> > 
> > Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
> > Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> > ---
> >  arch/Config.in.arm | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/arch/Config.in.arm b/arch/Config.in.arm
> > index aaf4506d7f..e6beacf3d8 100644
> > --- a/arch/Config.in.arm
> > +++ b/arch/Config.in.arm
> > @@ -534,9 +534,9 @@ config BR2_GCC_TARGET_CPU
> >  	default "strongarm"	if BR2_strongarm
> >  	default "xscale"	if BR2_xscale
> >  	default "iwmmxt"	if BR2_iwmmxt
> > -	default "cortex-a53"		if (BR2_cortex_a53 && !BR2_ARCH_IS_64)
> > -	default "cortex-a57"		if (BR2_cortex_a57 && !BR2_ARCH_IS_64)
> > -	default "cortex-a72"		if (BR2_cortex_a72 && !BR2_ARCH_IS_64)
> > +	default "cortex-a53"		if (BR2_cortex_a53)
> > +	default "cortex-a57"		if (BR2_cortex_a57)
> > +	default "cortex-a72"		if (BR2_cortex_a72)
> 
> What are the parentheses good for?

They are just so that the series is not applied on the first go. ;-)

Regards,
Yann E. MORIN.

> baruch
> 
> >  
> >  config BR2_GCC_TARGET_ABI
> >  	default "aapcs-linux"	if BR2_arm || BR2_armeb
> 
> -- 
>      http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
> =}------------------------------------------------ooO--U--Ooo------------{=
>    - baruch at tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
| +33 223 225 172 `------------.-------:  X  AGAINST      |  \e/  There is no  |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
'------------------------------^-------^------------------^--------------------'