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/addrspace.h> 9 #include <asm/sections.h> 10 #include <asm/io.h> 11 #include <asm/page.h> 12 #include <asm/dma.h> 13 14 static inline bool __debug_virt_addr_valid(unsigned long x) 15 { 16 /* 17 * MAX_DMA_ADDRESS is a virtual address that may not correspond to an 18 * actual physical address. Enough code relies on 19 * virt_to_phys(MAX_DMA_ADDRESS) that we just need to work around it 20 * and always return true. 21 */ 22 if (x == MAX_DMA_ADDRESS) 23 return true; 24 25 return x >= PAGE_OFFSET && (KSEGX(x) < KSEG2 || 26 IS_ENABLED(CONFIG_EVA) || 27 !IS_ENABLED(CONFIG_HIGHMEM)); 28 } 29 30 phys_addr_t __virt_to_phys(volatile const void *x) 31 { 32 WARN(!__debug_virt_addr_valid((unsigned long)x), 33 "virt_to_phys used for non-linear address: %pK (%pS)\n", 34 x, x); 35 36 return __virt_to_phys_nodebug(x); 37 } 38 EXPORT_SYMBOL(__virt_to_phys); 39 40 phys_addr_t __phys_addr_symbol(unsigned long x) 41 { 42 /* This is bounds checking against the kernel image only. 43 * __pa_symbol should only be used on kernel symbol addresses. 44 */ 45 VIRTUAL_BUG_ON(x < (unsigned long)_text || 46 x > (unsigned long)_end); 47 48 return __pa_symbol_nodebug(x); 49 } 50 EXPORT_SYMBOL(__phys_addr_symbol); 51