powerpc/44x: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')

Building ppc40x_defconfig leads to following error

  CC      arch/powerpc/kernel/idle.o
{standard input}: Assembler messages:
{standard input}:67: Error: unrecognized opcode: `wrteei'
{standard input}:78: Error: unrecognized opcode: `wrteei'

Add -mcpu=440 by default and alternatively 464 and 476.

Once that's done, -mcpu=powerpc is only for book3s/32 now.

But then comes

  CC      arch/powerpc/kernel/io.o
{standard input}: Assembler messages:
{standard input}:198: Error: unrecognized opcode: `eieio'
{standard input}:230: Error: unrecognized opcode: `eieio'
{standard input}:245: Error: unrecognized opcode: `eieio'
{standard input}:254: Error: unrecognized opcode: `eieio'
{standard input}:273: Error: unrecognized opcode: `eieio'
{standard input}:396: Error: unrecognized opcode: `eieio'
{standard input}:404: Error: unrecognized opcode: `eieio'
{standard input}:423: Error: unrecognized opcode: `eieio'
{standard input}:512: Error: unrecognized opcode: `eieio'
{standard input}:520: Error: unrecognized opcode: `eieio'
{standard input}:539: Error: unrecognized opcode: `eieio'
{standard input}:628: Error: unrecognized opcode: `eieio'
{standard input}:636: Error: unrecognized opcode: `eieio'
{standard input}:655: Error: unrecognized opcode: `eieio'

Fix it by replacing eieio by mbar on booke.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b0d982e223314ed82ab959f5d4ad2c4c00bedb99.1657549153.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/barrier.h

@@ -42,6 +42,8 @@
 /* The sub-arch has lwsync */
 #if defined(CONFIG_PPC64) || defined(CONFIG_PPC_E500MC)
 #    define SMPWMB      LWSYNC
+#elif defined(CONFIG_BOOKE)
+#    define SMPWMB      mbar
 #else
 #    define SMPWMB      eieio
 #endif

arch/powerpc/include/asm/nohash/pgtable.h

@@ -193,7 +193,7 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
 	if (IS_ENABLED(CONFIG_PPC32) && IS_ENABLED(CONFIG_PTE_64BIT) && !percpu) {
 		__asm__ __volatile__("\
 			stw%X0 %2,%0\n\
-			eieio\n\
+			mbar\n\
 			stw%X1 %L2,%1"
 		: "=m" (*ptep), "=m" (*((unsigned char *)ptep+4))
 		: "r" (pte) : "memory");

arch/powerpc/include/asm/synch.h

@@ -14,6 +14,9 @@ extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
 
 static inline void eieio(void)
 {
+	if (IS_ENABLED(CONFIG_BOOKE))
+		__asm__ __volatile__ ("mbar" : : : "memory");
+	else
 		__asm__ __volatile__ ("eieio" : : : "memory");
 }
 

arch/powerpc/mm/nohash/tlb_low.S

@@ -186,7 +186,7 @@ _GLOBAL(_tlbivax_bcast)
 	isync
 	PPC_TLBIVAX(0, R3)
 	isync
-	eieio
+	mbar
 	tlbsync
 BEGIN_FTR_SECTION
 	b	1f
@@ -355,7 +355,7 @@ _GLOBAL(_tlbivax_bcast)
 	rlwimi	r4,r6,MAS6_SIND_SHIFT,MAS6_SIND
 1:	mtspr	SPRN_MAS6,r4		/* assume AS=0 for now */
 	PPC_TLBIVAX(0,R3)
-	eieio
+	mbar
 	tlbsync
 	sync
 	wrtee	r10

arch/powerpc/platforms/Kconfig.cputype

@@ -137,7 +137,7 @@ config GENERIC_CPU
 
 config POWERPC_CPU
 	bool "Generic 32 bits powerpc"
-	depends on PPC32 && !PPC_8xx && !PPC_85xx && !40x
+	depends on PPC_BOOK3S_32
 
 config CELL_CPU
 	bool "Cell Broadband Engine"
@@ -183,6 +183,18 @@ config 405_CPU
 	bool "40x family"
 	depends on 40x
 
+config 440_CPU
+	bool "440 (44x family)"
+	depends on 44x
+
+config 464_CPU
+	bool "464 (44x family)"
+	depends on 44x
+
+config 476_CPU
+	bool "476 (47x family)"
+	depends on PPC_47x
+
 config 860_CPU
 	bool "8xx family"
 	depends on PPC_8xx
@@ -228,6 +240,9 @@ config TARGET_CPU
 	default "power8" if POWER8_CPU
 	default "power9" if POWER9_CPU
 	default "405" if 405_CPU
+	default "440" if 440_CPU
+	default "464" if 464_CPU
+	default "476" if 476_CPU
 	default "860" if 860_CPU
 	default "e300c2" if E300C2_CPU
 	default "e300c3" if E300C3_CPU

arch/powerpc/sysdev/fsl_rio.c

@@ -69,10 +69,10 @@
 
 static DEFINE_SPINLOCK(fsl_rio_config_lock);
 
-#define __fsl_read_rio_config(x, addr, err, op)		\
+#define ___fsl_read_rio_config(x, addr, err, op, barrier)	\
 	__asm__ __volatile__(				\
 		"1:	"op" %1,0(%2)\n"		\
-		"	eieio\n"			\
+		"	"barrier"\n"			\
 		"2:\n"					\
 		".section .fixup,\"ax\"\n"		\
 		"3:	li %1,-1\n"			\
@@ -83,6 +83,14 @@ static DEFINE_SPINLOCK(fsl_rio_config_lock);
 		: "=r" (err), "=r" (x)			\
 		: "b" (addr), "i" (-EFAULT), "0" (err))
 
+#ifdef CONFIG_BOOKE
+#define __fsl_read_rio_config(x, addr, err, op)	\
+	___fsl_read_rio_config(x, addr, err, op, "mbar")
+#else
+#define __fsl_read_rio_config(x, addr, err, op)	\
+	___fsl_read_rio_config(x, addr, err, op, "eieio")
+#endif
+
 void __iomem *rio_regs_win;
 void __iomem *rmu_regs_win;
 resource_size_t rio_law_start;