1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 */ 4 #ifndef _ASM_POWERPC_CACHEFLUSH_H 5 #define _ASM_POWERPC_CACHEFLUSH_H 6 7 #include <linux/mm.h> 8 #include <asm/cputable.h> 9 #include <asm/cpu_has_feature.h> 10 11 /* 12 * This flag is used to indicate that the page pointed to by a pte is clean 13 * and does not require cleaning before returning it to the user. 14 */ 15 #define PG_dcache_clean PG_arch_1 16 17 #ifdef CONFIG_PPC_BOOK3S_64 18 /* 19 * Book3s has no ptesync after setting a pte, so without this ptesync it's 20 * possible for a kernel virtual mapping access to return a spurious fault 21 * if it's accessed right after the pte is set. The page fault handler does 22 * not expect this type of fault. flush_cache_vmap is not exactly the right 23 * place to put this, but it seems to work well enough. 24 */ 25 static inline void flush_cache_vmap(unsigned long start, unsigned long end) 26 { 27 asm volatile("ptesync" ::: "memory"); 28 } 29 #define flush_cache_vmap flush_cache_vmap 30 #endif /* CONFIG_PPC_BOOK3S_64 */ 31 32 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 33 /* 34 * This is called when a page has been modified by the kernel. 35 * It just marks the page as not i-cache clean. We do the i-cache 36 * flush later when the page is given to a user process, if necessary. 37 */ 38 static inline void flush_dcache_folio(struct folio *folio) 39 { 40 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) 41 return; 42 /* avoid an atomic op if possible */ 43 if (test_bit(PG_dcache_clean, &folio->flags)) 44 clear_bit(PG_dcache_clean, &folio->flags); 45 } 46 #define flush_dcache_folio flush_dcache_folio 47 48 static inline void flush_dcache_page(struct page *page) 49 { 50 flush_dcache_folio(page_folio(page)); 51 } 52 53 void flush_icache_range(unsigned long start, unsigned long stop); 54 #define flush_icache_range flush_icache_range 55 56 void flush_icache_user_page(struct vm_area_struct *vma, struct page *page, 57 unsigned long addr, int len); 58 #define flush_icache_user_page flush_icache_user_page 59 60 void flush_dcache_icache_folio(struct folio *folio); 61 62 /** 63 * flush_dcache_range(): Write any modified data cache blocks out to memory and 64 * invalidate them. Does not invalidate the corresponding instruction cache 65 * blocks. 66 * 67 * @start: the start address 68 * @stop: the stop address (exclusive) 69 */ 70 static inline void flush_dcache_range(unsigned long start, unsigned long stop) 71 { 72 unsigned long shift = l1_dcache_shift(); 73 unsigned long bytes = l1_dcache_bytes(); 74 void *addr = (void *)(start & ~(bytes - 1)); 75 unsigned long size = stop - (unsigned long)addr + (bytes - 1); 76 unsigned long i; 77 78 if (IS_ENABLED(CONFIG_PPC64)) 79 mb(); /* sync */ 80 81 for (i = 0; i < size >> shift; i++, addr += bytes) 82 dcbf(addr); 83 mb(); /* sync */ 84 85 } 86 87 /* 88 * Write any modified data cache blocks out to memory. 89 * Does not invalidate the corresponding cache lines (especially for 90 * any corresponding instruction cache). 91 */ 92 static inline void clean_dcache_range(unsigned long start, unsigned long stop) 93 { 94 unsigned long shift = l1_dcache_shift(); 95 unsigned long bytes = l1_dcache_bytes(); 96 void *addr = (void *)(start & ~(bytes - 1)); 97 unsigned long size = stop - (unsigned long)addr + (bytes - 1); 98 unsigned long i; 99 100 for (i = 0; i < size >> shift; i++, addr += bytes) 101 dcbst(addr); 102 mb(); /* sync */ 103 } 104 105 /* 106 * Like above, but invalidate the D-cache. This is used by the 8xx 107 * to invalidate the cache so the PPC core doesn't get stale data 108 * from the CPM (no cache snooping here :-). 109 */ 110 static inline void invalidate_dcache_range(unsigned long start, 111 unsigned long stop) 112 { 113 unsigned long shift = l1_dcache_shift(); 114 unsigned long bytes = l1_dcache_bytes(); 115 void *addr = (void *)(start & ~(bytes - 1)); 116 unsigned long size = stop - (unsigned long)addr + (bytes - 1); 117 unsigned long i; 118 119 for (i = 0; i < size >> shift; i++, addr += bytes) 120 dcbi(addr); 121 mb(); /* sync */ 122 } 123 124 #ifdef CONFIG_4xx 125 static inline void flush_instruction_cache(void) 126 { 127 iccci((void *)KERNELBASE); 128 isync(); 129 } 130 #else 131 void flush_instruction_cache(void); 132 #endif 133 134 #include <asm-generic/cacheflush.h> 135 136 #endif /* _ASM_POWERPC_CACHEFLUSH_H */ 137