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如何从Linux内核的struct页面获取物理地址

[英]How to get physical address from struct page in linux kernel

原文 2016-01-17 09:14:38 8 1 memory-management/ linux-kernel

Suppose I get a pointer to struct page from allocator, how could I get corresponding physical address? 假设我从分配器中获得了指向struct page的指针，我该如何获取相应的物理地址？ Whether does kernel provide functions to achieve it? 内核是否提供实现它的功能？
Thanks. 谢谢。

1 个解决方案

The answer is page_to_phys(), but please make sure that this is really what you need. 答案是page_to_phys（），但是请确保这确实是您所需要的。 eg, if you want the physical address in order to hand it off to some device for DMA it is very likely what you need is the bus address for the page, which may or may not be the physical address. 例如，如果您想要物理地址以便将其传递给某些设备进行DMA，则很有可能您需要的是页面的总线地址，该地址可能是也可能不是物理地址。

http://lxr.free-electrons.com/source/include/asm-generic/page.h#L90 http://lxr.free-electrons.com/source/include/asm-generic/page.h#L90

如何从 Linux kernel 模块中的逻辑地址获取物理地址？ - How to get the physical address from the logical one in a Linux kernel module?

如何从结构页中获取关联数据的物理地址？ - How to get the physical address of the associated data from a struct page?

linux 内核 - 如何获取物理地址（内存管理）？ - linux kernel - how to get physical address (memory management)?

Linux Kernel 中 mm_struct 中的“pgd”属性是物理地址还是虚拟地址？ - Is 'pgd' Attribute Physical or Virtual Address in mm_struct in Linux Kernel?

从linux内核访问物理内存 - accessing physical memory from linux kernel

如何在Linux内核中向结构页面添加新字段 - how to add new fields to struct page in linux kernel

在不使用ioremap或mmap的情况下写入Linux内核中的可缓存物理地址 - Write to a cacheable physical address in linux kernel without using ioremap or mmap

如何在内核中从一个物理页面复制到另一个物理页面 - how to copy from one physical page to another in kernel

如何以编程方式获取Linux内核页面大小 - How to get linux kernel page size programmatically

内核如何知道虚拟地址空间中的哪些页面对应于换出的物理页框？ - How does kernel know, which pages in the virtual address space correspond to a swapped out physical page frame?

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相关问题 如何从 Linux kernel 模块中的逻辑地址获取物理地址？ - How to get the physical address from the logical one in a Linux kernel module? 如何从结构页中获取关联数据的物理地址？ - How to get the physical address of the associated data from a struct page? linux 内核 - 如何获取物理地址（内存管理）？ - linux kernel - how to get physical address (memory management)? Linux Kernel 中 mm_struct 中的“pgd”属性是物理地址还是虚拟地址？ - Is 'pgd' Attribute Physical or Virtual Address in mm_struct in Linux Kernel? 从linux内核访问物理内存 - accessing physical memory from linux kernel 如何在Linux内核中向结构页面添加新字段 - how to add new fields to struct page in linux kernel 在不使用ioremap或mmap的情况下写入Linux内核中的可缓存物理地址 - Write to a cacheable physical address in linux kernel without using ioremap or mmap 如何在内核中从一个物理页面复制到另一个物理页面 - how to copy from one physical page to another in kernel 如何以编程方式获取Linux内核页面大小 - How to get linux kernel page size programmatically 内核如何知道虚拟地址空间中的哪些页面对应于换出的物理页框？ - How does kernel know, which pages in the virtual address space correspond to a swapped out physical page frame?

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