cacheflush.h 2.04 KB
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
 * Copyright (C) 2015 Regents of the University of California
 */

#ifndef _ASM_RISCV_CACHEFLUSH_H
#define _ASM_RISCV_CACHEFLUSH_H

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#include <linux/mm.h>
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static inline void local_flush_icache_all(void)
{
	asm volatile ("fence.i" ::: "memory");
}

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#define PG_dcache_clean PG_arch_1

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static inline void flush_dcache_folio(struct folio *folio)
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{
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	if (test_bit(PG_dcache_clean, &folio->flags))
		clear_bit(PG_dcache_clean, &folio->flags);
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}
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#define flush_dcache_folio flush_dcache_folio
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#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
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static inline void flush_dcache_page(struct page *page)
{
	flush_dcache_folio(page_folio(page));
}

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/*
 * 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()
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#define flush_icache_user_page(vma, pg, addr, len)	\
do {							\
	if (vma->vm_flags & VM_EXEC)			\
		flush_icache_mm(vma->vm_mm, 0);		\
} while (0)
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#ifdef CONFIG_64BIT
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#define flush_cache_vmap(start, end)		flush_tlb_kernel_range(start, end)
#define flush_cache_vmap_early(start, end)	local_flush_tlb_kernel_range(start, end)
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#endif

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#ifndef CONFIG_SMP

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#define flush_icache_all() local_flush_icache_all()
#define flush_icache_mm(mm, local) flush_icache_all()
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#else /* CONFIG_SMP */

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void flush_icache_all(void);
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void flush_icache_mm(struct mm_struct *mm, bool local);
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#endif /* CONFIG_SMP */

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extern unsigned int riscv_cbom_block_size;
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extern unsigned int riscv_cboz_block_size;
void riscv_init_cbo_blocksizes(void);
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#ifdef CONFIG_RISCV_DMA_NONCOHERENT
void riscv_noncoherent_supported(void);
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void __init riscv_set_dma_cache_alignment(void);
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#else
static inline void riscv_noncoherent_supported(void) {}
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static inline void riscv_set_dma_cache_alignment(void) {}
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#endif

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/*
 * 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)

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#include <asm-generic/cacheflush.h>

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#endif /* _ASM_RISCV_CACHEFLUSH_H */