1*dfad83cbSFlorian Fainelli // SPDX-License-Identifier: GPL-2.0 2*dfad83cbSFlorian Fainelli #include <linux/bug.h> 3*dfad83cbSFlorian Fainelli #include <linux/export.h> 4*dfad83cbSFlorian Fainelli #include <linux/types.h> 5*dfad83cbSFlorian Fainelli #include <linux/mmdebug.h> 6*dfad83cbSFlorian Fainelli #include <linux/mm.h> 7*dfad83cbSFlorian Fainelli 8*dfad83cbSFlorian Fainelli #include <asm/sections.h> 9*dfad83cbSFlorian Fainelli #include <asm/io.h> 10*dfad83cbSFlorian Fainelli #include <asm/page.h> 11*dfad83cbSFlorian Fainelli #include <asm/dma.h> 12*dfad83cbSFlorian Fainelli 13*dfad83cbSFlorian Fainelli static inline bool __debug_virt_addr_valid(unsigned long x) 14*dfad83cbSFlorian Fainelli { 15*dfad83cbSFlorian Fainelli /* high_memory does not get immediately defined, and there 16*dfad83cbSFlorian Fainelli * are early callers of __pa() against PAGE_OFFSET 17*dfad83cbSFlorian Fainelli */ 18*dfad83cbSFlorian Fainelli if (!high_memory && x >= PAGE_OFFSET) 19*dfad83cbSFlorian Fainelli return true; 20*dfad83cbSFlorian Fainelli 21*dfad83cbSFlorian Fainelli if (high_memory && x >= PAGE_OFFSET && x < (unsigned long)high_memory) 22*dfad83cbSFlorian Fainelli return true; 23*dfad83cbSFlorian Fainelli 24*dfad83cbSFlorian Fainelli /* 25*dfad83cbSFlorian Fainelli * MAX_DMA_ADDRESS is a virtual address that may not correspond to an 26*dfad83cbSFlorian Fainelli * actual physical address. Enough code relies on 27*dfad83cbSFlorian Fainelli * virt_to_phys(MAX_DMA_ADDRESS) that we just need to work around it 28*dfad83cbSFlorian Fainelli * and always return true. 29*dfad83cbSFlorian Fainelli */ 30*dfad83cbSFlorian Fainelli if (x == MAX_DMA_ADDRESS) 31*dfad83cbSFlorian Fainelli return true; 32*dfad83cbSFlorian Fainelli 33*dfad83cbSFlorian Fainelli return false; 34*dfad83cbSFlorian Fainelli } 35*dfad83cbSFlorian Fainelli 36*dfad83cbSFlorian Fainelli phys_addr_t __virt_to_phys(volatile const void *x) 37*dfad83cbSFlorian Fainelli { 38*dfad83cbSFlorian Fainelli WARN(!__debug_virt_addr_valid((unsigned long)x), 39*dfad83cbSFlorian Fainelli "virt_to_phys used for non-linear address: %pK (%pS)\n", 40*dfad83cbSFlorian Fainelli x, x); 41*dfad83cbSFlorian Fainelli 42*dfad83cbSFlorian Fainelli return __virt_to_phys_nodebug(x); 43*dfad83cbSFlorian Fainelli } 44*dfad83cbSFlorian Fainelli EXPORT_SYMBOL(__virt_to_phys); 45*dfad83cbSFlorian Fainelli 46*dfad83cbSFlorian Fainelli phys_addr_t __phys_addr_symbol(unsigned long x) 47*dfad83cbSFlorian Fainelli { 48*dfad83cbSFlorian Fainelli /* This is bounds checking against the kernel image only. 49*dfad83cbSFlorian Fainelli * __pa_symbol should only be used on kernel symbol addresses. 50*dfad83cbSFlorian Fainelli */ 51*dfad83cbSFlorian Fainelli VIRTUAL_BUG_ON(x < (unsigned long)_text || 52*dfad83cbSFlorian Fainelli x > (unsigned long)_end); 53*dfad83cbSFlorian Fainelli 54*dfad83cbSFlorian Fainelli return __pa_symbol_nodebug(x); 55*dfad83cbSFlorian Fainelli } 56*dfad83cbSFlorian Fainelli EXPORT_SYMBOL(__phys_addr_symbol); 57