arch/riscv/include/asm/cacheflush.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2015 Regents of the University of California
 */

#ifndef _ASM_RISCV_CACHEFLUSH_H
#define _ASM_RISCV_CACHEFLUSH_H

#include <linux/mm.h>

#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0

/*
 * The cache doesn't need to be flushed when TLB entries change when
 * the cache is mapped to physical memory, not virtual memory
 */
static inline void flush_cache_all(void)
{
}

static inline void flush_cache_mm(struct mm_struct *mm)
{
}

static inline void flush_cache_dup_mm(struct mm_struct *mm)
{
}

static inline void flush_cache_range(struct vm_area_struct *vma,
				     unsigned long start,
				     unsigned long end)
{
}

static inline void flush_cache_page(struct vm_area_struct *vma,
				    unsigned long vmaddr,
				    unsigned long pfn)
{
}

static inline void flush_dcache_mmap_lock(struct address_space *mapping)
{
}

static inline void flush_dcache_mmap_unlock(struct address_space *mapping)
{
}

static inline void flush_icache_page(struct vm_area_struct *vma,
				     struct page *page)
{
}

static inline void flush_cache_vmap(unsigned long start, unsigned long end)
{
}

static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
{
}

#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
	do { \
		memcpy(dst, src, len); \
		flush_icache_user_range(vma, page, vaddr, len); \
	} while (0)
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
	memcpy(dst, src, len)

static inline void local_flush_icache_all(void)
{
	asm volatile ("fence.i" ::: "memory");
}

#define PG_dcache_clean PG_arch_1

static inline void flush_dcache_page(struct page *page)
{
	if (test_bit(PG_dcache_clean, &page->flags))
		clear_bit(PG_dcache_clean, &page->flags);
}

/*
 * RISC-V doesn't have an instruction to flush parts of the instruction cache,
 * so instead we just flush the whole thing.
 */
#define flush_icache_range(start, end) flush_icache_all()
#define flush_icache_user_range(vma, pg, addr, len) flush_icache_mm(vma->vm_mm, 0)

#ifndef CONFIG_SMP

#define flush_icache_all() local_flush_icache_all()
#define flush_icache_mm(mm, local) flush_icache_all()

#else /* CONFIG_SMP */

void flush_icache_all(void);
void flush_icache_mm(struct mm_struct *mm, bool local);

#endif /* CONFIG_SMP */

/*
 * Bits in sys_riscv_flush_icache()'s flags argument.
 */
#define SYS_RISCV_FLUSH_ICACHE_LOCAL 1UL
#define SYS_RISCV_FLUSH_ICACHE_ALL   (SYS_RISCV_FLUSH_ICACHE_LOCAL)

#endif /* _ASM_RISCV_CACHEFLUSH_H */