1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2012 ARM Ltd.
4 */
5 #ifndef __ASM_CACHE_H
6 #define __ASM_CACHE_H
7
8 #define L1_CACHE_SHIFT (6)
9 #define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
10
11 #define CLIDR_LOUU_SHIFT 27
12 #define CLIDR_LOC_SHIFT 24
13 #define CLIDR_LOUIS_SHIFT 21
14
15 #define CLIDR_LOUU(clidr) (((clidr) >> CLIDR_LOUU_SHIFT) & 0x7)
16 #define CLIDR_LOC(clidr) (((clidr) >> CLIDR_LOC_SHIFT) & 0x7)
17 #define CLIDR_LOUIS(clidr) (((clidr) >> CLIDR_LOUIS_SHIFT) & 0x7)
18
19 /* Ctypen, bits[3(n - 1) + 2 : 3(n - 1)], for n = 1 to 7 */
20 #define CLIDR_CTYPE_SHIFT(level) (3 * (level - 1))
21 #define CLIDR_CTYPE_MASK(level) (7 << CLIDR_CTYPE_SHIFT(level))
22 #define CLIDR_CTYPE(clidr, level) \
23 (((clidr) & CLIDR_CTYPE_MASK(level)) >> CLIDR_CTYPE_SHIFT(level))
24
25 /* Ttypen, bits [2(n - 1) + 34 : 2(n - 1) + 33], for n = 1 to 7 */
26 #define CLIDR_TTYPE_SHIFT(level) (2 * ((level) - 1) + CLIDR_EL1_Ttypen_SHIFT)
27
28 /*
29 * Memory returned by kmalloc() may be used for DMA, so we must make
30 * sure that all such allocations are cache aligned. Otherwise,
31 * unrelated code may cause parts of the buffer to be read into the
32 * cache before the transfer is done, causing old data to be seen by
33 * the CPU.
34 */
35 #define ARCH_DMA_MINALIGN (128)
36 #define ARCH_KMALLOC_MINALIGN (8)
37
38 #ifndef __ASSEMBLY__
39
40 #include <linux/bitops.h>
41 #include <linux/kasan-enabled.h>
42
43 #include <asm/cputype.h>
44 #include <asm/mte-def.h>
45 #include <asm/sysreg.h>
46
47 #ifdef CONFIG_KASAN_SW_TAGS
48 #define ARCH_SLAB_MINALIGN (1ULL << KASAN_SHADOW_SCALE_SHIFT)
49 #elif defined(CONFIG_KASAN_HW_TAGS)
50 static inline unsigned int arch_slab_minalign(void)
51 {
52 return kasan_hw_tags_enabled() ? MTE_GRANULE_SIZE :
53 __alignof__(unsigned long long);
54 }
55 #define arch_slab_minalign() arch_slab_minalign()
56 #endif
57
58 #define CTR_L1IP(ctr) SYS_FIELD_GET(CTR_EL0, L1Ip, ctr)
59
60 #define ICACHEF_ALIASING 0
61 extern unsigned long __icache_flags;
62
63 /*
64 * Whilst the D-side always behaves as PIPT on AArch64, aliasing is
65 * permitted in the I-cache.
66 */
67 static inline int icache_is_aliasing(void)
68 {
69 return test_bit(ICACHEF_ALIASING, &__icache_flags);
70 }
71
72 static inline u32 cache_type_cwg(void)
73 {
74 return SYS_FIELD_GET(CTR_EL0, CWG, read_cpuid_cachetype());
75 }
76
77 #define __read_mostly __section(".data..read_mostly")
78
79 static inline int cache_line_size_of_cpu(void)
80 {
81 u32 cwg = cache_type_cwg();
82
83 return cwg ? 4 << cwg : ARCH_DMA_MINALIGN;
84 }
85
86 int cache_line_size(void);
87
88 #define dma_get_cache_alignment cache_line_size
89
90 /*
91 * Read the effective value of CTR_EL0.
92 *
93 * According to ARM ARM for ARMv8-A (ARM DDI 0487C.a),
94 * section D10.2.33 "CTR_EL0, Cache Type Register" :
95 *
96 * CTR_EL0.IDC reports the data cache clean requirements for
97 * instruction to data coherence.
98 *
99 * 0 - dcache clean to PoU is required unless :
100 * (CLIDR_EL1.LoC == 0) || (CLIDR_EL1.LoUIS == 0 && CLIDR_EL1.LoUU == 0)
101 * 1 - dcache clean to PoU is not required for i-to-d coherence.
102 *
103 * This routine provides the CTR_EL0 with the IDC field updated to the
104 * effective state.
105 */
106 static inline u32 __attribute_const__ read_cpuid_effective_cachetype(void)
107 {
108 u32 ctr = read_cpuid_cachetype();
109
110 if (!(ctr & BIT(CTR_EL0_IDC_SHIFT))) {
111 u64 clidr = read_sysreg(clidr_el1);
112
113 if (CLIDR_LOC(clidr) == 0 ||
114 (CLIDR_LOUIS(clidr) == 0 && CLIDR_LOUU(clidr) == 0))
115 ctr |= BIT(CTR_EL0_IDC_SHIFT);
116 }
117
118 return ctr;
119 }
120
121 #endif /* __ASSEMBLY__ */
122
123 #endif
124
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