linux-kernel - [PATCH v2 3/4] powerpc: Rewrite 4xx flush_cache

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Date:   Fri, 14 Aug 2020 05:56:26 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, hch@...radead.org
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 3/4] powerpc: Rewrite 4xx flush_cache_instruction() in C

Nothing prevents flush_cache_instruction() from being writen in C.

Do it to improve readability and maintainability.

This function is very small and isn't called from assembly,
make it static inline in asm/cacheflush.h

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
v2: Written as a static inline instead of adding a new C file for this function alone.
---
 arch/powerpc/include/asm/cacheflush.h | 8 ++++++++
 arch/powerpc/kernel/misc_32.S         | 7 +------
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/include/asm/cacheflush.h b/arch/powerpc/include/asm/cacheflush.h
index 481877879fec..138e46d8c04e 100644
--- a/arch/powerpc/include/asm/cacheflush.h
+++ b/arch/powerpc/include/asm/cacheflush.h
@@ -98,7 +98,15 @@ static inline void invalidate_dcache_range(unsigned long start,
 	mb();	/* sync */
 }
 
+#ifdef CONFIG_4xx
+static inline void flush_instruction_cache(void)
+{
+	iccci((void *)KERNELBASE);
+	isync();
+}
+#else
 void flush_instruction_cache(void);
+#endif
 
 #include <asm-generic/cacheflush.h>
 
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index 5c074c2ff5b5..1bda207459a8 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -272,12 +272,8 @@ _ASM_NOKPROBE_SYMBOL(real_writeb)
 /*
  * Flush instruction cache.
  */
-#if !defined(CONFIG_PPC_8xx) && !defined(CONFIG_PPC_BOOK3S_32)
+#ifdef CONFIG_FSL_BOOKE
 _GLOBAL(flush_instruction_cache)
-#if defined(CONFIG_4xx)
-	lis	r3, KERNELBASE@h
-	iccci	0,r3
-#elif defined(CONFIG_FSL_BOOKE)
 #ifdef CONFIG_E200
 	mfspr   r3,SPRN_L1CSR0
 	ori     r3,r3,L1CSR0_CFI|L1CSR0_CLFC
@@ -289,7 +285,6 @@ _GLOBAL(flush_instruction_cache)
 	mfspr	r3,SPRN_L1CSR1
 	ori	r3,r3,L1CSR1_ICFI|L1CSR1_ICLFR
 	mtspr	SPRN_L1CSR1,r3
-#endif /* CONFIG_4xx */
 	isync
 	blr
 EXPORT_SYMBOL(flush_instruction_cache)
-- 
2.25.0