1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/bug.h>
 3#include <linux/export.h>
 4#include <linux/types.h>
 5#include <linux/mmdebug.h>
 6#include <linux/mm.h>
 7
 8#include <asm/sections.h>
 9#include <asm/io.h>
10#include <asm/page.h>
11#include <asm/dma.h>
12
13static inline bool __debug_virt_addr_valid(unsigned long x)
14{
15	/* high_memory does not get immediately defined, and there
16	 * are early callers of __pa() against PAGE_OFFSET
17	 */
18	if (!high_memory && x >= PAGE_OFFSET)
19		return true;
20
21	if (high_memory && x >= PAGE_OFFSET && x < (unsigned long)high_memory)
22		return true;
23
24	/*
25	 * MAX_DMA_ADDRESS is a virtual address that may not correspond to an
26	 * actual physical address. Enough code relies on
27	 * virt_to_phys(MAX_DMA_ADDRESS) that we just need to work around it
28	 * and always return true.
29	 */
30	if (x == MAX_DMA_ADDRESS)
31		return true;
32
33	return false;
34}
35
36phys_addr_t __virt_to_phys(volatile const void *x)
37{
38	WARN(!__debug_virt_addr_valid((unsigned long)x),
39	     "virt_to_phys used for non-linear address: %pK (%pS)\n",
40	     x, x);
41
42	return __virt_to_phys_nodebug(x);
43}
44EXPORT_SYMBOL(__virt_to_phys);
45
46phys_addr_t __phys_addr_symbol(unsigned long x)
47{
48	/* This is bounds checking against the kernel image only.
49	 * __pa_symbol should only be used on kernel symbol addresses.
50	 */
51	VIRTUAL_BUG_ON(x < (unsigned long)_text ||
52		       x > (unsigned long)_end);
53
54	return __pa_symbol_nodebug(x);
55}
56EXPORT_SYMBOL(__phys_addr_symbol);