powerpc/64: flush_inval_dcache_range() becomes flush_dcache_range()

On most arches having function flush_dcache_range(), including PPC32,
this function does a writeback and invalidation of the cache bloc.

On PPC64, flush_dcache_range() only does a writeback while
flush_inval_dcache_range() does the invalidation in addition.

In addition it looks like within arch/powerpc/, there are no PPC64
platforms using flush_dcache_range()

This patch drops the existing 64 bits version of flush_dcache_range()
and renames flush_inval_dcache_range() into flush_dcache_range().
Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/cacheflush.h

@@ -112,7 +112,6 @@ static inline void invalidate_dcache_range(unsigned long start,
 #endif /* CONFIG_PPC32 */
 #ifdef CONFIG_PPC64
 extern void flush_dcache_range(unsigned long start, unsigned long stop);
-extern void flush_inval_dcache_range(unsigned long start, unsigned long stop);
 #endif
 
 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \

arch/powerpc/kernel/misc_64.S

@@ -121,31 +121,8 @@ EXPORT_SYMBOL(flush_icache_range)
  *
  *    flush all bytes from start to stop-1 inclusive
  */
-_GLOBAL_TOC(flush_dcache_range)
 
-/*
- * Flush the data cache to memory 
- * 
- * Different systems have different cache line sizes
- */
- 	ld	r10,PPC64_CACHES@toc(r2)
-	lwz	r7,DCACHEL1BLOCKSIZE(r10)	/* Get dcache block size */
-	addi	r5,r7,-1
-	andc	r6,r3,r5		/* round low to line bdy */
-	subf	r8,r6,r4		/* compute length */
-	add	r8,r8,r5		/* ensure we get enough */
-	lwz	r9,DCACHEL1LOGBLOCKSIZE(r10)	/* Get log-2 of dcache block size */
-	srw.	r8,r8,r9		/* compute line count */
-	beqlr				/* nothing to do? */
-	mtctr	r8
-0:	dcbst	0,r6
-	add	r6,r6,r7
-	bdnz	0b
-	sync
-	blr
-EXPORT_SYMBOL(flush_dcache_range)
-
-_GLOBAL(flush_inval_dcache_range)
+_GLOBAL_TOC(flush_dcache_range)
  	ld	r10,PPC64_CACHES@toc(r2)
 	lwz	r7,DCACHEL1BLOCKSIZE(r10)	/* Get dcache block size */
 	addi	r5,r7,-1
@@ -164,7 +141,7 @@ _GLOBAL(flush_inval_dcache_range)
 	sync
 	isync
 	blr
-
+EXPORT_SYMBOL(flush_dcache_range)
 
 /*
  * Flush a particular page from the data cache to RAM.

arch/powerpc/lib/pmem.c

@@ -23,14 +23,14 @@
 void arch_wb_cache_pmem(void *addr, size_t size)
 {
 	unsigned long start = (unsigned long) addr;
-	flush_inval_dcache_range(start, start + size);
+	flush_dcache_range(start, start + size);
 }
 EXPORT_SYMBOL(arch_wb_cache_pmem);
 
 void arch_invalidate_pmem(void *addr, size_t size)
 {
 	unsigned long start = (unsigned long) addr;
-	flush_inval_dcache_range(start, start + size);
+	flush_dcache_range(start, start + size);
 }
 EXPORT_SYMBOL(arch_invalidate_pmem);
 
@@ -43,7 +43,7 @@ long __copy_from_user_flushcache(void *dest, const void __user *src,
 	unsigned long copied, start = (unsigned long) dest;
 
 	copied = __copy_from_user(dest, src, size);
-	flush_inval_dcache_range(start, start + size);
+	flush_dcache_range(start, start + size);
 
 	return copied;
 }
@@ -53,7 +53,7 @@ void *memcpy_flushcache(void *dest, const void *src, size_t size)
 	unsigned long start = (unsigned long) dest;
 
 	memcpy(dest, src, size);
-	flush_inval_dcache_range(start, start + size);
+	flush_dcache_range(start, start + size);
 
 	return dest;
 }

arch/powerpc/mm/mem.c

@@ -125,7 +125,7 @@ int __ref arch_add_memory(int nid, u64 start, u64 size,
 			start, start + size, rc);
 		return -EFAULT;
 	}
-	flush_inval_dcache_range(start, start + size);
+	flush_dcache_range(start, start + size);
 
 	return __add_pages(nid, start_pfn, nr_pages, restrictions);
 }
@@ -151,7 +151,7 @@ void __ref arch_remove_memory(int nid, u64 start, u64 size,
 
 	/* Remove htab bolted mappings for this section of memory */
 	start = (unsigned long)__va(start);
-	flush_inval_dcache_range(start, start + size);
+	flush_dcache_range(start, start + size);
 	ret = remove_section_mapping(start, start + size);
 	WARN_ON_ONCE(ret);
 

arch/powerpc/sysdev/dart_iommu.c

@@ -158,7 +158,7 @@ static void dart_cache_sync(unsigned int *base, unsigned int count)
 	unsigned int tmp;
 
 	/* Perform a standard cache flush */
-	flush_inval_dcache_range(start, end);
+	flush_dcache_range(start, end);
 
 	/*
 	 * Perform the sequence described in the CPC925 manual to

drivers/macintosh/smu.c

@@ -133,7 +133,7 @@ static void smu_start_cmd(void)
 	/* Flush command and data to RAM */
 	faddr = (unsigned long)smu->cmd_buf;
 	fend = faddr + smu->cmd_buf->length + 2;
-	flush_inval_dcache_range(faddr, fend);
+	flush_dcache_range(faddr, fend);
 
 
 	/* We also disable NAP mode for the duration of the command
@@ -195,7 +195,7 @@ static irqreturn_t smu_db_intr(int irq, void *arg)
 		 * reply length (it's only 2 cache lines anyway)
 		 */
 		faddr = (unsigned long)smu->cmd_buf;
-		flush_inval_dcache_range(faddr, faddr + 256);
+		flush_dcache_range(faddr, faddr + 256);
 
 		/* Now check ack */
 		ack = (~cmd->cmd) & 0xff;