1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2015 Regents of the University of California
4  */
5 
6 #ifndef _ASM_RISCV_CACHEFLUSH_H
7 #define _ASM_RISCV_CACHEFLUSH_H
8 
9 #include <linux/mm.h>
10 
local_flush_icache_all(void)11 static inline void local_flush_icache_all(void)
12 {
13 	asm volatile ("fence.i" ::: "memory");
14 }
15 
16 #define PG_dcache_clean PG_arch_1
17 
flush_dcache_folio(struct folio * folio)18 static inline void flush_dcache_folio(struct folio *folio)
19 {
20 	if (test_bit(PG_dcache_clean, &folio->flags))
21 		clear_bit(PG_dcache_clean, &folio->flags);
22 }
23 #define flush_dcache_folio flush_dcache_folio
24 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
25 
flush_dcache_page(struct page * page)26 static inline void flush_dcache_page(struct page *page)
27 {
28 	flush_dcache_folio(page_folio(page));
29 }
30 
31 /*
32  * RISC-V doesn't have an instruction to flush parts of the instruction cache,
33  * so instead we just flush the whole thing.
34  */
35 #define flush_icache_range(start, end) flush_icache_all()
36 #define flush_icache_user_page(vma, pg, addr, len) \
37 	flush_icache_mm(vma->vm_mm, 0)
38 
39 #ifdef CONFIG_64BIT
40 #define flush_cache_vmap(start, end)		flush_tlb_kernel_range(start, end)
41 #define flush_cache_vmap_early(start, end)	local_flush_tlb_kernel_range(start, end)
42 #endif
43 
44 #ifndef CONFIG_SMP
45 
46 #define flush_icache_all() local_flush_icache_all()
47 #define flush_icache_mm(mm, local) flush_icache_all()
48 
49 #else /* CONFIG_SMP */
50 
51 void flush_icache_all(void);
52 void flush_icache_mm(struct mm_struct *mm, bool local);
53 
54 #endif /* CONFIG_SMP */
55 
56 extern unsigned int riscv_cbom_block_size;
57 extern unsigned int riscv_cboz_block_size;
58 void riscv_init_cbo_blocksizes(void);
59 
60 #ifdef CONFIG_RISCV_DMA_NONCOHERENT
61 void riscv_noncoherent_supported(void);
62 void __init riscv_set_dma_cache_alignment(void);
63 #else
riscv_noncoherent_supported(void)64 static inline void riscv_noncoherent_supported(void) {}
riscv_set_dma_cache_alignment(void)65 static inline void riscv_set_dma_cache_alignment(void) {}
66 #endif
67 
68 /*
69  * Bits in sys_riscv_flush_icache()'s flags argument.
70  */
71 #define SYS_RISCV_FLUSH_ICACHE_LOCAL 1UL
72 #define SYS_RISCV_FLUSH_ICACHE_ALL   (SYS_RISCV_FLUSH_ICACHE_LOCAL)
73 
74 #include <asm-generic/cacheflush.h>
75 
76 #endif /* _ASM_RISCV_CACHEFLUSH_H */
77