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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#include <linux/cache.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <asm/cache.h>
void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
pte_t *pte)
{
unsigned long addr;
struct page *page;
if (!pfn_valid(pte_pfn(*pte)))
return;
page = pfn_to_page(pte_pfn(*pte));
if (page == ZERO_PAGE(0))
return;
if (test_and_set_bit(PG_dcache_clean, &page->flags))
return;
addr = (unsigned long) kmap_atomic(page);
dcache_wb_range(addr, addr + PAGE_SIZE);
if (vma->vm_flags & VM_EXEC)
icache_inv_range(addr, addr + PAGE_SIZE);
kunmap_atomic((void *) addr);
}
void flush_icache_deferred(struct mm_struct *mm)
{
unsigned int cpu = smp_processor_id();
cpumask_t *mask = &mm->context.icache_stale_mask;
if (cpumask_test_cpu(cpu, mask)) {
cpumask_clear_cpu(cpu, mask);
/*
* Ensure the remote hart's writes are visible to this hart.
* This pairs with a barrier in flush_icache_mm.
*/
smp_mb();
local_icache_inv_all(NULL);
}
}
void flush_icache_mm_range(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
unsigned int cpu;
cpumask_t others, *mask;
preempt_disable();
#ifdef CONFIG_CPU_HAS_ICACHE_INS
if (mm == current->mm) {
icache_inv_range(start, end);
preempt_enable();
return;
}
#endif
/* Mark every hart's icache as needing a flush for this MM. */
mask = &mm->context.icache_stale_mask;
cpumask_setall(mask);
/* Flush this hart's I$ now, and mark it as flushed. */
cpu = smp_processor_id();
cpumask_clear_cpu(cpu, mask);
local_icache_inv_all(NULL);
/*
* Flush the I$ of other harts concurrently executing, and mark them as
* flushed.
*/
cpumask_andnot(&others, mm_cpumask(mm), cpumask_of(cpu));
if (mm != current->active_mm || !cpumask_empty(&others)) {
on_each_cpu_mask(&others, local_icache_inv_all, NULL, 1);
cpumask_clear(mask);
}
preempt_enable();
}
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