1b3cb73f73
Thomas Gleixner reported that mmaping and unmapping each physical page in turn eventually caused the kernel to oops. It appears that pfn_valid() in the discontigmem case was too simplistic for proper operation. Tighten the logic so we also check if the PFN is within the range of the selected memory node. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
214 lines
6.1 KiB
C
214 lines
6.1 KiB
C
/*
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* linux/include/asm-arm/memory.h
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*
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* Copyright (C) 2000-2002 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Note: this file should not be included by non-asm/.h files
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*/
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#ifndef __ASM_ARM_MEMORY_H
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#define __ASM_ARM_MEMORY_H
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#include <linux/config.h>
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#include <linux/compiler.h>
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#include <asm/arch/memory.h>
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#ifndef TASK_SIZE
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/*
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* TASK_SIZE - the maximum size of a user space task.
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* TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
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*/
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#define TASK_SIZE (0xbf000000UL)
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#define TASK_UNMAPPED_BASE (0x40000000UL)
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#endif
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/*
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* The maximum size of a 26-bit user space task.
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*/
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#define TASK_SIZE_26 (0x04000000UL)
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/*
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* Page offset: 3GB
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*/
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#ifndef PAGE_OFFSET
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#define PAGE_OFFSET (0xc0000000UL)
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#endif
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/*
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* Physical vs virtual RAM address space conversion. These are
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* private definitions which should NOT be used outside memory.h
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* files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
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*/
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#ifndef __virt_to_phys
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#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
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#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
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#endif
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/*
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* The module space lives between the addresses given by TASK_SIZE
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* and PAGE_OFFSET - it must be within 32MB of the kernel text.
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*/
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#define MODULE_END (PAGE_OFFSET)
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#define MODULE_START (MODULE_END - 16*1048576)
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#if TASK_SIZE > MODULE_START
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#error Top of user space clashes with start of module space
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#endif
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#ifndef __ASSEMBLY__
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/*
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* The DMA mask corresponding to the maximum bus address allocatable
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* using GFP_DMA. The default here places no restriction on DMA
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* allocations. This must be the smallest DMA mask in the system,
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* so a successful GFP_DMA allocation will always satisfy this.
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*/
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#ifndef ISA_DMA_THRESHOLD
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#define ISA_DMA_THRESHOLD (0xffffffffULL)
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#endif
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#ifndef arch_adjust_zones
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#define arch_adjust_zones(node,size,holes) do { } while (0)
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#endif
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/*
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* PFNs are used to describe any physical page; this means
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* PFN 0 == physical address 0.
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*
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* This is the PFN of the first RAM page in the kernel
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* direct-mapped view. We assume this is the first page
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* of RAM in the mem_map as well.
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*/
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#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
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/*
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* These are *only* valid on the kernel direct mapped RAM memory.
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* Note: Drivers should NOT use these. They are the wrong
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* translation for translating DMA addresses. Use the driver
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* DMA support - see dma-mapping.h.
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*/
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static inline unsigned long virt_to_phys(void *x)
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{
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return __virt_to_phys((unsigned long)(x));
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}
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static inline void *phys_to_virt(unsigned long x)
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{
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return (void *)(__phys_to_virt((unsigned long)(x)));
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}
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/*
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* Drivers should NOT use these either.
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*/
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#define __pa(x) __virt_to_phys((unsigned long)(x))
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#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
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/*
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* Virtual <-> DMA view memory address translations
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* Again, these are *only* valid on the kernel direct mapped RAM
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* memory. Use of these is *deprecated* (and that doesn't mean
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* use the __ prefixed forms instead.) See dma-mapping.h.
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*/
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static inline __deprecated unsigned long virt_to_bus(void *x)
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{
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return __virt_to_bus((unsigned long)x);
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}
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static inline __deprecated void *bus_to_virt(unsigned long x)
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{
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return (void *)__bus_to_virt(x);
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}
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/*
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* Conversion between a struct page and a physical address.
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*
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* Note: when converting an unknown physical address to a
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* struct page, the resulting pointer must be validated
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* using VALID_PAGE(). It must return an invalid struct page
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* for any physical address not corresponding to a system
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* RAM address.
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*
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* page_to_pfn(page) convert a struct page * to a PFN number
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* pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
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* pfn_valid(pfn) indicates whether a PFN number is valid
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*
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* virt_to_page(k) convert a _valid_ virtual address to struct page *
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* virt_addr_valid(k) indicates whether a virtual address is valid
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*/
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#ifndef CONFIG_DISCONTIGMEM
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#define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET)
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#define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET)
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#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
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#define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
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#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
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#define PHYS_TO_NID(addr) (0)
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#else /* CONFIG_DISCONTIGMEM */
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/*
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* This is more complex. We have a set of mem_map arrays spread
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* around in memory.
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*/
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#include <linux/numa.h>
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#define page_to_pfn(page) \
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(( (page) - page_zone(page)->zone_mem_map) \
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+ page_zone(page)->zone_start_pfn)
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#define pfn_to_page(pfn) \
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(PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT))
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#define pfn_valid(pfn) \
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({ \
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unsigned int nid = PFN_TO_NID(pfn); \
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int valid = nid < MAX_NUMNODES; \
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if (valid) { \
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pg_data_t *node = NODE_DATA(nid); \
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valid = (pfn - node->node_start_pfn) < \
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node->node_spanned_pages; \
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} \
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valid; \
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})
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#define virt_to_page(kaddr) \
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(ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
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#define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
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/*
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* Common discontigmem stuff.
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* PHYS_TO_NID is used by the ARM kernel/setup.c
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*/
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#define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
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#endif /* !CONFIG_DISCONTIGMEM */
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/*
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* For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
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*/
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#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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/*
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* Optional device DMA address remapping. Do _not_ use directly!
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* We should really eliminate virt_to_bus() here - it's deprecated.
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*/
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#ifndef __arch_page_to_dma
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#define page_to_dma(dev, page) ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page)))
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#define dma_to_virt(dev, addr) ((void *)__bus_to_virt(addr))
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#define virt_to_dma(dev, addr) ((dma_addr_t)__virt_to_bus((unsigned long)(addr)))
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#else
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#define page_to_dma(dev, page) (__arch_page_to_dma(dev, page))
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#define dma_to_virt(dev, addr) (__arch_dma_to_virt(dev, addr))
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#define virt_to_dma(dev, addr) (__arch_virt_to_dma(dev, addr))
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#endif
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#endif
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#endif
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