[PATCH v1 07/10] powerpc/mm: move iounmap() into ioremap.c and drop __iounmap()

[Christophe Leroy]

On PPC64 iounmap() does nothing else than calling __iounmap()
and is the only user of __iounmap().
__iounmap() is almost similar to PPC32 iounmap().

Lets define a common iounmap() and drop __iounmap().

Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>
---
 arch/powerpc/include/asm/book3s/32/pgtable.h |  2 ++
 arch/powerpc/include/asm/io.h                |  5 -----
 arch/powerpc/include/asm/nohash/32/pgtable.h |  2 ++
 arch/powerpc/mm/ioremap.c                    | 31 ++++++++++++++++++++++++++++
 arch/powerpc/mm/pgtable_32.c                 | 14 -------------
 arch/powerpc/mm/pgtable_64.c                 | 28 -------------------------
 6 files changed, 35 insertions(+), 47 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h
index aa1bc5f8da90..af34554d19e8 100644
--- a/arch/powerpc/include/asm/book3s/32/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/32/pgtable.h
@@ -165,6 +165,8 @@ int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
 #define IOREMAP_TOP	KVIRT_TOP
 #endif
 
+#define IOREMAP_BASE	VMALLOC_START
+
 /*
  * Just any arbitrary offset to the start of the vmalloc VM area: the
  * current 16MB value just means that there will be a 64MB "hole" after the
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
index 23e5d5d16c7e..02d6256fe1ea 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -712,9 +712,6 @@ static inline void iosync(void)
  * * __ioremap_caller is the same as above but takes an explicit caller
  *   reference rather than using __builtin_return_address(0)
  *
- * * __iounmap, is the low level implementation used by iounmap and cannot
- *   be hooked (but can be used by a hook on iounmap)
- *
  */
 extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
 extern void __iomem *ioremap_prot(phys_addr_t address, unsigned long size,
@@ -734,8 +731,6 @@ extern void __iomem *__ioremap(phys_addr_t, unsigned long size,
 extern void __iomem *__ioremap_caller(phys_addr_t, unsigned long size,
 				      pgprot_t prot, void *caller);
 
-extern void __iounmap(volatile void __iomem *addr);
-
 extern void __iomem * __ioremap_at(phys_addr_t pa, void *ea,
 				   unsigned long size, pgprot_t prot);
 extern void __iounmap_at(void *ea, unsigned long size);
diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
index 7ce2a7c9fade..09f2739ab556 100644
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
@@ -93,6 +93,8 @@ int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
 #define IOREMAP_TOP	KVIRT_TOP
 #endif
 
+#define IOREMAP_BASE	VMALLOC_START
+
 /*
  * Just any arbitrary offset to the start of the vmalloc VM area: the
  * current 16MB value just means that there will be a 64MB "hole" after the
diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c
index 0c23660522ca..57d742509cec 100644
--- a/arch/powerpc/mm/ioremap.c
+++ b/arch/powerpc/mm/ioremap.c
@@ -1,7 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
 #include <asm/io-workarounds.h>
+#include <mm/mmu_decl.h>
 
 unsigned long ioremap_bot;
 EXPORT_SYMBOL(ioremap_bot);
@@ -72,3 +75,31 @@ void __iomem *ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long f
 	return __ioremap_caller(addr, size, pte_pgprot(pte), caller);
 }
 EXPORT_SYMBOL(ioremap_prot);
+
+/*
+ * Unmap an IO region and remove it from vmalloc'd list.
+ * Access to IO memory should be serialized by driver.
+ */
+void iounmap(volatile void __iomem *token)
+{
+	void *addr;
+
+	/*
+	 * If mapped by BATs then there is nothing to do.
+	 */
+	if (v_block_mapped((unsigned long)token))
+		return;
+
+	if (!slab_is_available())
+		return;
+
+	addr = (void *)((unsigned long __force)PCI_FIX_ADDR(token) & PAGE_MASK);
+	if (WARN_ON((unsigned long)addr < IOREMAP_BASE))
+		return;
+	if ((unsigned long)addr >= ioremap_bot) {
+		pr_warn("Attempt to %s early bolted mapping at 0x%p\n", __func__, addr);
+		return;
+	}
+	vunmap(addr);
+}
+EXPORT_SYMBOL(iounmap);
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 7efdb1dee19b..4597f45e4dc6 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -110,20 +110,6 @@ __ioremap_caller(phys_addr_t addr, unsigned long size, pgprot_t prot, void *call
 	return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
 }
 
-void iounmap(volatile void __iomem *addr)
-{
-	/*
-	 * If mapped by BATs then there is nothing to do.
-	 * Calling vfree() generates a benign warning.
-	 */
-	if (v_block_mapped((unsigned long)addr))
-		return;
-
-	if (addr > high_memory && (unsigned long) addr < ioremap_bot)
-		vunmap((void *) (PAGE_MASK & (unsigned long)addr));
-}
-EXPORT_SYMBOL(iounmap);
-
 static void __init *early_alloc_pgtable(unsigned long size)
 {
 	void *ptr = memblock_alloc(size, size);
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index d631659c8859..b50a53a0a42b 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -201,35 +201,7 @@ void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size,
 	return ret;
 }
 
-/*  
- * Unmap an IO region and remove it from imalloc'd list.
- * Access to IO memory should be serialized by driver.
- */
-void __iounmap(volatile void __iomem *token)
-{
-	void *addr;
-
-	if (!slab_is_available())
-		return;
-	
-	addr = (void *) ((unsigned long __force)
-			 PCI_FIX_ADDR(token) & PAGE_MASK);
-	if ((unsigned long)addr >= ioremap_bot) {
-		printk(KERN_WARNING "Attempt to iounmap early bolted mapping"
-		       " at 0x%p\n", addr);
-		return;
-	}
-	vunmap(addr);
-}
-
-void iounmap(volatile void __iomem *token)
-{
-	__iounmap(token);
-}
-
 EXPORT_SYMBOL(__ioremap_at);
-EXPORT_SYMBOL(iounmap);
-EXPORT_SYMBOL(__iounmap);
 EXPORT_SYMBOL(__iounmap_at);
 
 #ifndef __PAGETABLE_PUD_FOLDED
-- 
2.13.3