mirror of
git://git.yoctoproject.org/linux-yocto.git
synced 2025-07-19 03:59:45 +02:00
f6bec26c0a
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) <rppt@kernel.org> Acked-by: Song Liu <song@kernel.org> Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2002 Richard Henderson
|
|
* Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
|
|
* Copyright (C) 2023 Luis Chamberlain <mcgrof@kernel.org>
|
|
* Copyright (C) 2024 Mike Rapoport IBM.
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/execmem.h>
|
|
#include <linux/moduleloader.h>
|
|
|
|
static struct execmem_info *execmem_info __ro_after_init;
|
|
|
|
static void *__execmem_alloc(struct execmem_range *range, size_t size)
|
|
{
|
|
unsigned long start = range->start;
|
|
unsigned long end = range->end;
|
|
unsigned int align = range->alignment;
|
|
pgprot_t pgprot = range->pgprot;
|
|
|
|
return __vmalloc_node_range(size, align, start, end,
|
|
GFP_KERNEL, pgprot, VM_FLUSH_RESET_PERMS,
|
|
NUMA_NO_NODE, __builtin_return_address(0));
|
|
}
|
|
|
|
void *execmem_alloc(enum execmem_type type, size_t size)
|
|
{
|
|
struct execmem_range *range;
|
|
|
|
if (!execmem_info)
|
|
return module_alloc(size);
|
|
|
|
range = &execmem_info->ranges[type];
|
|
|
|
return __execmem_alloc(range, size);
|
|
}
|
|
|
|
void execmem_free(void *ptr)
|
|
{
|
|
/*
|
|
* This memory may be RO, and freeing RO memory in an interrupt is not
|
|
* supported by vmalloc.
|
|
*/
|
|
WARN_ON(in_interrupt());
|
|
vfree(ptr);
|
|
}
|
|
|
|
static bool execmem_validate(struct execmem_info *info)
|
|
{
|
|
struct execmem_range *r = &info->ranges[EXECMEM_DEFAULT];
|
|
|
|
if (!r->alignment || !r->start || !r->end || !pgprot_val(r->pgprot)) {
|
|
pr_crit("Invalid parameters for execmem allocator, module loading will fail");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static void execmem_init_missing(struct execmem_info *info)
|
|
{
|
|
struct execmem_range *default_range = &info->ranges[EXECMEM_DEFAULT];
|
|
|
|
for (int i = EXECMEM_DEFAULT + 1; i < EXECMEM_TYPE_MAX; i++) {
|
|
struct execmem_range *r = &info->ranges[i];
|
|
|
|
if (!r->start) {
|
|
r->pgprot = default_range->pgprot;
|
|
r->alignment = default_range->alignment;
|
|
r->start = default_range->start;
|
|
r->end = default_range->end;
|
|
}
|
|
}
|
|
}
|
|
|
|
struct execmem_info * __weak execmem_arch_setup(void)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
void __init execmem_init(void)
|
|
{
|
|
struct execmem_info *info = execmem_arch_setup();
|
|
|
|
if (!info || !execmem_validate(info))
|
|
return;
|
|
|
|
execmem_init_missing(info);
|
|
|
|
execmem_info = info;
|
|
}
|