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#include <asm/cputype.h>
  9
 10#define CTR_L1IP_SHIFT		14
 11#define CTR_L1IP_MASK		3
 12#define CTR_DMINLINE_SHIFT	16
 13#define CTR_IMINLINE_SHIFT	0
 14#define CTR_IMINLINE_MASK	0xf
 15#define CTR_ERG_SHIFT		20
 16#define CTR_CWG_SHIFT		24
 17#define CTR_CWG_MASK		15
 18#define CTR_IDC_SHIFT		28
 19#define CTR_DIC_SHIFT		29
 20
 21#define CTR_CACHE_MINLINE_MASK	\
 22	(0xf << CTR_DMINLINE_SHIFT | CTR_IMINLINE_MASK << CTR_IMINLINE_SHIFT)
 23
 24#define CTR_L1IP(ctr)		(((ctr) >> CTR_L1IP_SHIFT) & CTR_L1IP_MASK)
 25
 26#define ICACHE_POLICY_VPIPT	0
 27#define ICACHE_POLICY_RESERVED	1
 28#define ICACHE_POLICY_VIPT	2
 29#define ICACHE_POLICY_PIPT	3
 30
 31#define L1_CACHE_SHIFT		(6)
 32#define L1_CACHE_BYTES		(1 << L1_CACHE_SHIFT)
 33
 34
 35#define CLIDR_LOUU_SHIFT	27
 36#define CLIDR_LOC_SHIFT		24
 37#define CLIDR_LOUIS_SHIFT	21
 38
 39#define CLIDR_LOUU(clidr)	(((clidr) >> CLIDR_LOUU_SHIFT) & 0x7)
 40#define CLIDR_LOC(clidr)	(((clidr) >> CLIDR_LOC_SHIFT) & 0x7)
 41#define CLIDR_LOUIS(clidr)	(((clidr) >> CLIDR_LOUIS_SHIFT) & 0x7)
 42
 43/*
 44 * Memory returned by kmalloc() may be used for DMA, so we must make
 45 * sure that all such allocations are cache aligned. Otherwise,
 46 * unrelated code may cause parts of the buffer to be read into the
 47 * cache before the transfer is done, causing old data to be seen by
 48 * the CPU.
 49 */
 50#define ARCH_DMA_MINALIGN	(128)
 51
 52#ifdef CONFIG_KASAN_SW_TAGS
 53#define ARCH_SLAB_MINALIGN	(1ULL << KASAN_SHADOW_SCALE_SHIFT)
 54#elif defined(CONFIG_KASAN_HW_TAGS)
 55#define ARCH_SLAB_MINALIGN	MTE_GRANULE_SIZE
 56#endif
 57
 58#ifndef __ASSEMBLY__
 59
 60#include <linux/bitops.h>
 61
 62#define ICACHEF_ALIASING	0
 63#define ICACHEF_VPIPT		1
 64extern unsigned long __icache_flags;
 65
 66/*
 67 * Whilst the D-side always behaves as PIPT on AArch64, aliasing is
 68 * permitted in the I-cache.
 69 */
 70static inline int icache_is_aliasing(void)
 71{
 72	return test_bit(ICACHEF_ALIASING, &__icache_flags);
 73}
 74
 75static __always_inline int icache_is_vpipt(void)
 76{
 77	return test_bit(ICACHEF_VPIPT, &__icache_flags);
 78}
 79
 80static inline u32 cache_type_cwg(void)
 81{
 82	return (read_cpuid_cachetype() >> CTR_CWG_SHIFT) & CTR_CWG_MASK;
 83}
 84
 85#define __read_mostly __section(".data..read_mostly")
 86
 87static inline int cache_line_size_of_cpu(void)
 88{
 89	u32 cwg = cache_type_cwg();
 90
 91	return cwg ? 4 << cwg : ARCH_DMA_MINALIGN;
 92}
 93
 94int cache_line_size(void);
 95
 96/*
 97 * Read the effective value of CTR_EL0.
 98 *
 99 * According to ARM ARM for ARMv8-A (ARM DDI 0487C.a),
100 * section D10.2.33 "CTR_EL0, Cache Type Register" :
101 *
102 * CTR_EL0.IDC reports the data cache clean requirements for
103 * instruction to data coherence.
104 *
105 *  0 - dcache clean to PoU is required unless :
106 *     (CLIDR_EL1.LoC == 0) || (CLIDR_EL1.LoUIS == 0 && CLIDR_EL1.LoUU == 0)
107 *  1 - dcache clean to PoU is not required for i-to-d coherence.
108 *
109 * This routine provides the CTR_EL0 with the IDC field updated to the
110 * effective state.
111 */
112static inline u32 __attribute_const__ read_cpuid_effective_cachetype(void)
113{
114	u32 ctr = read_cpuid_cachetype();
115
116	if (!(ctr & BIT(CTR_IDC_SHIFT))) {
117		u64 clidr = read_sysreg(clidr_el1);
118
119		if (CLIDR_LOC(clidr) == 0 ||
120		    (CLIDR_LOUIS(clidr) == 0 && CLIDR_LOUU(clidr) == 0))
121			ctr |= BIT(CTR_IDC_SHIFT);
122	}
123
124	return ctr;
125}
126
127#endif	/* __ASSEMBLY__ */
128
129#endif