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// SPDX-License-Identifier: GPL-2.0-only
/*
* Based on arch/arm/mm/flush.c
*
* Copyright (C) 1995-2002 Russell King
* Copyright (C) 2012 ARM Ltd.
*/
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <asm/cacheflush.h>
#include <asm/cache.h>
#include <asm/tlbflush.h>
void sync_icache_aliases(unsigned long start, unsigned long end)
{
if (icache_is_aliasing()) {
dcache_clean_pou(start, end);
icache_inval_all_pou();
} else {
/*
* Don't issue kick_all_cpus_sync() after I-cache invalidation
* for user mappings.
*/
caches_clean_inval_pou(start, end);
}
}
static void flush_ptrace_access(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
if (vma->vm_flags & VM_EXEC)
sync_icache_aliases(start, end);
}
/*
* Copy user data from/to a page which is mapped into a different processes
* address space. Really, we want to allow our "user space" model to handle
* this.
*/
void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
unsigned long uaddr, void *dst, const void *src,
unsigned long len)
{
memcpy(dst, src, len);
flush_ptrace_access(vma, (unsigned long)dst, (unsigned long)dst + len);
}
void __sync_icache_dcache(pte_t pte)
{
struct page *page = pte_page(pte);
/*
* HugeTLB pages are always fully mapped, so only setting head page's
* PG_dcache_clean flag is enough.
*/
if (PageHuge(page))
page = compound_head(page);
if (!test_bit(PG_dcache_clean, &page->flags)) {
sync_icache_aliases((unsigned long)page_address(page),
(unsigned long)page_address(page) +
page_size(page));
set_bit(PG_dcache_clean, &page->flags);
}
}
EXPORT_SYMBOL_GPL(__sync_icache_dcache);
/*
* This function is called when a page has been modified by the kernel. Mark
* it as dirty for later flushing when mapped in user space (if executable,
* see __sync_icache_dcache).
*/
void flush_dcache_page(struct page *page)
{
/*
* Only the head page's flags of HugeTLB can be cleared since the tail
* vmemmap pages associated with each HugeTLB page are mapped with
* read-only when CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP is enabled (more
* details can refer to vmemmap_remap_pte()). Although
* __sync_icache_dcache() only set PG_dcache_clean flag on the head
* page struct, there is more than one page struct with PG_dcache_clean
* associated with the HugeTLB page since the head vmemmap page frame
* is reused (more details can refer to the comments above
* page_fixed_fake_head()).
*/
if (hugetlb_optimize_vmemmap_enabled() && PageHuge(page))
page = compound_head(page);
if (test_bit(PG_dcache_clean, &page->flags))
clear_bit(PG_dcache_clean, &page->flags);
}
EXPORT_SYMBOL(flush_dcache_page);
/*
* Additional functions defined in assembly.
*/
EXPORT_SYMBOL(caches_clean_inval_pou);
#ifdef CONFIG_ARCH_HAS_PMEM_API
void arch_wb_cache_pmem(void *addr, size_t size)
{
/* Ensure order against any prior non-cacheable writes */
dmb(osh);
dcache_clean_pop((unsigned long)addr, (unsigned long)addr + size);
}
EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
void arch_invalidate_pmem(void *addr, size_t size)
{
dcache_inval_poc((unsigned long)addr, (unsigned long)addr + size);
}
EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
#endif
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