powerpc: Wire up /proc/vmallocinfo to our ioremap()

This adds the necessary bits and pieces to powerpc implementation of
ioremap to benefit from caller tracking in /proc/vmallocinfo, at least
for ioremap's done after mem init as the older ones aren't tracked.

Signed-off-by: Benjamin Herrenschmidt <[e-mail]>

arch/powerpc/include/asm/io.h

···
  *   ioremap_flags and cannot be hooked (but can be used by a hook on one
  *   of the previous ones)
  *
+ * * __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, unsigned long size,
 			       unsigned long flags);
+extern void __iomem *__ioremap_caller(phys_addr_t, unsigned long size,
+				      unsigned long flags, void *caller);
+
 extern void __iounmap(volatile void __iomem *addr);
 
 extern void __iomem * __ioremap_at(phys_addr_t pa, void *ea,

arch/powerpc/include/asm/machdep.h

···
 	void		(*tce_flush)(struct iommu_table *tbl);
 
 	void __iomem *	(*ioremap)(phys_addr_t addr, unsigned long size,
-				   unsigned long flags);
+				   unsigned long flags, void *caller);
 	void		(*iounmap)(volatile void __iomem *token);
 
 #ifdef CONFIG_PM

arch/powerpc/mm/pgtable_32.c

···
 void __iomem *
 ioremap(phys_addr_t addr, unsigned long size)
 {
-	return __ioremap(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED);
+	return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED,
+				__builtin_return_address(0));
 }
 EXPORT_SYMBOL(ioremap);
 
···
 	/* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
 	flags &= ~(_PAGE_USER | _PAGE_EXEC | _PAGE_HWEXEC);
 
-	return __ioremap(addr, size, flags);
+	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
 }
 EXPORT_SYMBOL(ioremap_flags);
 
 void __iomem *
 __ioremap(phys_addr_t addr, unsigned long size, unsigned long flags)
+{
+	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
+}
+
+void __iomem *
+__ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
+		 void *caller)
 {
 	unsigned long v, i;
 	phys_addr_t p;
···
 
 	if (mem_init_done) {
 		struct vm_struct *area;
-		area = get_vm_area(size, VM_IOREMAP);
+		area = get_vm_area_caller(size, VM_IOREMAP, caller);
 		if (area == 0)
 			return NULL;
 		v = (unsigned long) area->addr;

arch/powerpc/mm/pgtable_64.c

···
 	unmap_kernel_range((unsigned long)ea, size);
 }
 
-void __iomem * __ioremap(phys_addr_t addr, unsigned long size,
-			 unsigned long flags)
+void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size,
+				unsigned long flags, void *caller)
 {
 	phys_addr_t paligned;
 	void __iomem *ret;
···
 	if (mem_init_done) {
 		struct vm_struct *area;
 
-		area = __get_vm_area(size, VM_IOREMAP,
-				     ioremap_bot, IOREMAP_END);
+		area = __get_vm_area_caller(size, VM_IOREMAP,
+					    ioremap_bot, IOREMAP_END,
+					    caller);
 		if (area == NULL)
 			return NULL;
 		ret = __ioremap_at(paligned, area->addr, size, flags);
···
 	return ret;
 }
 
+void __iomem * __ioremap(phys_addr_t addr, unsigned long size,
+			 unsigned long flags)
+{
+	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
+}
 
 void __iomem * ioremap(phys_addr_t addr, unsigned long size)
 {
 	unsigned long flags = _PAGE_NO_CACHE | _PAGE_GUARDED;
+	void *caller = __builtin_return_address(0);
 
 	if (ppc_md.ioremap)
-		return ppc_md.ioremap(addr, size, flags);
-	return __ioremap(addr, size, flags);
+		return ppc_md.ioremap(addr, size, flags, caller);
+	return __ioremap_caller(addr, size, flags, caller);
 }
 
 void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size,
 			     unsigned long flags)
 {
+	void *caller = __builtin_return_address(0);
+
 	/* writeable implies dirty for kernel addresses */
 	if (flags & _PAGE_RW)
 		flags |= _PAGE_DIRTY;
···
 	flags &= ~(_PAGE_USER | _PAGE_EXEC);
 
 	if (ppc_md.ioremap)
-		return ppc_md.ioremap(addr, size, flags);
-	return __ioremap(addr, size, flags);
+		return ppc_md.ioremap(addr, size, flags, caller);
+	return __ioremap_caller(addr, size, flags, caller);
 }
 
 

arch/powerpc/platforms/cell/io-workarounds.c

···
 };
 
 static void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size,
-						unsigned long flags)
+				  unsigned long flags, void *caller)
 {
 	struct iowa_bus *bus;
-	void __iomem *res = __ioremap(addr, size, flags);
+	void __iomem *res = __ioremap_caller(addr, size, flags, caller);
 	int busno;
 
 	bus = iowa_pci_find(0, (unsigned long)addr);

arch/powerpc/platforms/iseries/setup.c

···
 }
 
 static void __iomem *iseries_ioremap(phys_addr_t address, unsigned long size,
-				     unsigned long flags)
+				     unsigned long flags, void *caller)
 {
 	return (void __iomem *)address;
 }