Subject: [PATCH 2/2] powerpc/64s: update cpu selection options

From: Nicholas Piggin <[email-masked]>
Date: Wed, 21 Sep 2022 11:41:03 +1000

Update the 64s GENERIC_CPU option. POWER4 support has been dropped, so
make that clear in the option name. The POWER5_CPU option is dropped
because it's uncommon, and GENERIC_CPU covers it.

-mtune= before power8 is dropped because the minimum gcc version
supports power8, and tuning is made consistent between big and little
endian.

A 970 option is added for PowerPC 970 / G5 because they still have a
user base, and -mtune=power8 does not generate good code for the 970.

This also updates the ISA versions document to add Power4/Power4+
because I didn't realise Power4+ used 2.01.

Signed-off-by: Nicholas Piggin <[email-masked]>
---
The 970 option builds and boots a QEMU TCG 970 machine.

 Documentation/powerpc/isa-versions.rst | 14 ++++++++++++++
 arch/powerpc/Makefile                  |  5 +++--
 arch/powerpc/platforms/Kconfig.cputype |  8 ++++----
 3 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/Documentation/powerpc/isa-versions.rst b/Documentation/powerpc/isa-versions.rst
index dfcb1097dce4..a242b3821681 100644
--- a/Documentation/powerpc/isa-versions.rst
+++ b/Documentation/powerpc/isa-versions.rst
@@ -4,6 +4,8 @@ CPU to ISA Version Mapping
 
 Mapping of some CPU versions to relevant ISA versions.
 
+Note Power4 and Power4+ are not supported.
+
 ========= ====================================================================
 CPU       Architecture version
 ========= ====================================================================
@@ -24,6 +26,12 @@ PPC970    - PowerPC User Instruction Set Architecture Book I v2.01
           - PowerPC Virtual Environment Architecture Book II v2.01
           - PowerPC Operating Environment Architecture Book III v2.01
           - Plus Altivec/VMX ~= 2.03
+Power4+   - PowerPC User Instruction Set Architecture Book I v2.01
+          - PowerPC Virtual Environment Architecture Book II v2.01
+          - PowerPC Operating Environment Architecture Book III v2.01
+Power4    - PowerPC User Instruction Set Architecture Book I v2.00
+          - PowerPC Virtual Environment Architecture Book II v2.00
+          - PowerPC Operating Environment Architecture Book III v2.00
 ========= ====================================================================

@@ -44,6 +52,8 @@ Power5++   No
 Power5+    No
 Power5     No
 PPC970     Yes
+Power4+    No
+Power4     No
 ========== ==================
 
 ========== ====
@@ -60,6 +70,8 @@ Power5++   No
 Power5+    No
 Power5     No
 PPC970     No
+Power4+    No
+Power4     No
 ========== ====
 
 ========== ====================================
@@ -76,4 +88,6 @@ Power5++   No
 Power5+    No
 Power5     No
 PPC970     No
+Power4+    No
+Power4     No
 ========== ====================================
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 140a5e6471fe..8a3d69b02672 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -149,11 +149,12 @@ CFLAGS-$(CONFIG_PPC32)	+= $(call cc-option,-mno-readonly-in-sdata)
 ifdef CONFIG_PPC_BOOK3S_64
 ifdef CONFIG_CPU_LITTLE_ENDIAN
 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
-CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
 else
-CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power4
 endif
+CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power10,	\
+				  $(call cc-option,-mtune=power9,	\
+				  $(call cc-option,-mtune=power8)))
 else ifdef CONFIG_PPC_BOOK3E_64
 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
 endif
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 5185d942b455..4017be72e46f 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -125,7 +125,7 @@ choice
 	  If unsure, select Generic.
 
 config GENERIC_CPU
-	bool "Generic (POWER4 and above)"
+	bool "Generic (POWER5 and PowerPC 970 and above)"
 	depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
 	select PPC_64S_HASH_MMU
 
@@ -144,8 +144,8 @@ config CELL_CPU
 	depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
 	select PPC_64S_HASH_MMU
 
-config POWER5_CPU
-	bool "POWER5"
+config PPC_970_CPU
+	bool "PowerPC 970 (including PowerPC G5)"
 	depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
 	select PPC_64S_HASH_MMU
 
@@ -234,7 +234,7 @@ config TARGET_CPU
 	string
 	depends on TARGET_CPU_BOOL
 	default "cell" if CELL_CPU
-	default "power5" if POWER5_CPU
+	default "970" if PPC_970_CPU
 	default "power6" if POWER6_CPU
 	default "power7" if POWER7_CPU
 	default "power8" if POWER8_CPU
-- 
2.37.2