s390/mm: provide simple ARCH_HAS_DEBUG_VIRTUAL support

Provide a very simple ARCH_HAS_DEBUG_VIRTUAL implementation.
For now errors are only reported for the following cases:

- Trying to translate a vmalloc or module address to a physical address

- Translating a supposed to be ZONE_DMA virtual address into a physical
  address, and the resulting physical address is larger than two GiB

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/s390/mm/physaddr.c b/arch/s390/mm/physaddr.c
new file mode 100644
index 000000000000..59de866c72d9
--- /dev/null
+++ b/arch/s390/mm/physaddr.c
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/mmdebug.h>
+#include <linux/export.h>
+#include <linux/mm.h>
+#include <asm/page.h>
+
+unsigned long __phys_addr(unsigned long x, bool is_31bit)
+{
+	VIRTUAL_BUG_ON(is_vmalloc_or_module_addr((void *)(x)));
+	x = __pa_nodebug(x);
+	if (is_31bit)
+		VIRTUAL_BUG_ON(x >> 31);
+	return x;
+}
+EXPORT_SYMBOL(__phys_addr);