From f6bec26c0a7364d3506a3e12dab7c228ef32bd65 Mon Sep 17 00:00:00 2001 From: "Mike Rapoport (IBM)" Date: Sun, 5 May 2024 19:06:19 +0300 Subject: mm/execmem, arch: convert simple overrides of module_alloc to execmem Several architectures override module_alloc() only to define address range for code allocations different than VMALLOC address space. Provide a generic implementation in execmem that uses the parameters for address space ranges, required alignment and page protections provided by architectures. The architectures must fill execmem_info structure and implement execmem_arch_setup() that returns a pointer to that structure. This way the execmem initialization won't be called from every architecture, but rather from a central place, namely a core_initcall() in execmem. The execmem provides execmem_alloc() API that wraps __vmalloc_node_range() with the parameters defined by the architectures. If an architecture does not implement execmem_arch_setup(), execmem_alloc() will fall back to module_alloc(). Signed-off-by: Mike Rapoport (IBM) Acked-by: Song Liu Reviewed-by: Masami Hiramatsu (Google) Signed-off-by: Luis Chamberlain --- include/linux/execmem.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) (limited to 'include') diff --git a/include/linux/execmem.h b/include/linux/execmem.h index 8eebc8ef66e7..96fc59258467 100644 --- a/include/linux/execmem.h +++ b/include/linux/execmem.h @@ -33,6 +33,47 @@ enum execmem_type { EXECMEM_TYPE_MAX, }; +/** + * struct execmem_range - definition of an address space suitable for code and + * related data allocations + * @start: address space start + * @end: address space end (inclusive) + * @pgprot: permissions for memory in this address space + * @alignment: alignment required for text allocations + */ +struct execmem_range { + unsigned long start; + unsigned long end; + pgprot_t pgprot; + unsigned int alignment; +}; + +/** + * struct execmem_info - architecture parameters for code allocations + * @ranges: array of parameter sets defining architecture specific + * parameters for executable memory allocations. The ranges that are not + * explicitly initialized by an architecture use parameters defined for + * @EXECMEM_DEFAULT. + */ +struct execmem_info { + struct execmem_range ranges[EXECMEM_TYPE_MAX]; +}; + +/** + * execmem_arch_setup - define parameters for allocations of executable memory + * + * A hook for architectures to define parameters for allocations of + * executable memory. These parameters should be filled into the + * @execmem_info structure. + * + * For architectures that do not implement this method a default set of + * parameters will be used + * + * Return: a structure defining architecture parameters and restrictions + * for allocations of executable memory + */ +struct execmem_info *execmem_arch_setup(void); + /** * execmem_alloc - allocate executable memory * @type: type of the allocation @@ -54,4 +95,10 @@ void *execmem_alloc(enum execmem_type type, size_t size); */ void execmem_free(void *ptr); +#ifdef CONFIG_EXECMEM +void execmem_init(void); +#else +static inline void execmem_init(void) {} +#endif + #endif /* _LINUX_EXECMEM_ALLOC_H */ -- cgit v1.2.3