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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012 ARM Ltd.
*/
#ifndef __ASM_CACHE_H
#define __ASM_CACHE_H
#define L1_CACHE_SHIFT (6)
#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
#define CLIDR_LOUU_SHIFT 27
#define CLIDR_LOC_SHIFT 24
#define CLIDR_LOUIS_SHIFT 21
#define CLIDR_LOUU(clidr) (((clidr) >> CLIDR_LOUU_SHIFT) & 0x7)
#define CLIDR_LOC(clidr) (((clidr) >> CLIDR_LOC_SHIFT) & 0x7)
#define CLIDR_LOUIS(clidr) (((clidr) >> CLIDR_LOUIS_SHIFT) & 0x7)
/*
* Memory returned by kmalloc() may be used for DMA, so we must make
* sure that all such allocations are cache aligned. Otherwise,
* unrelated code may cause parts of the buffer to be read into the
* cache before the transfer is done, causing old data to be seen by
* the CPU.
*/
#define ARCH_DMA_MINALIGN (128)
#ifndef __ASSEMBLY__
#include <linux/bitops.h>
#include <linux/kasan-enabled.h>
#include <asm/cputype.h>
#include <asm/mte-def.h>
#include <asm/sysreg.h>
#ifdef CONFIG_KASAN_SW_TAGS
#define ARCH_SLAB_MINALIGN (1ULL << KASAN_SHADOW_SCALE_SHIFT)
#elif defined(CONFIG_KASAN_HW_TAGS)
static inline unsigned int arch_slab_minalign(void)
{
return kasan_hw_tags_enabled() ? MTE_GRANULE_SIZE :
__alignof__(unsigned long long);
}
#define arch_slab_minalign() arch_slab_minalign()
#endif
#define CTR_L1IP(ctr) SYS_FIELD_GET(CTR_EL0, L1Ip, ctr)
#define ICACHEF_ALIASING 0
#define ICACHEF_VPIPT 1
extern unsigned long __icache_flags;
/*
* Whilst the D-side always behaves as PIPT on AArch64, aliasing is
* permitted in the I-cache.
*/
static inline int icache_is_aliasing(void)
{
return test_bit(ICACHEF_ALIASING, &__icache_flags);
}
static __always_inline int icache_is_vpipt(void)
{
return test_bit(ICACHEF_VPIPT, &__icache_flags);
}
static inline u32 cache_type_cwg(void)
{
return SYS_FIELD_GET(CTR_EL0, CWG, read_cpuid_cachetype());
}
#define __read_mostly __section(".data..read_mostly")
static inline int cache_line_size_of_cpu(void)
{
u32 cwg = cache_type_cwg();
return cwg ? 4 << cwg : ARCH_DMA_MINALIGN;
}
int cache_line_size(void);
/*
* Read the effective value of CTR_EL0.
*
* According to ARM ARM for ARMv8-A (ARM DDI 0487C.a),
* section D10.2.33 "CTR_EL0, Cache Type Register" :
*
* CTR_EL0.IDC reports the data cache clean requirements for
* instruction to data coherence.
*
* 0 - dcache clean to PoU is required unless :
* (CLIDR_EL1.LoC == 0) || (CLIDR_EL1.LoUIS == 0 && CLIDR_EL1.LoUU == 0)
* 1 - dcache clean to PoU is not required for i-to-d coherence.
*
* This routine provides the CTR_EL0 with the IDC field updated to the
* effective state.
*/
static inline u32 __attribute_const__ read_cpuid_effective_cachetype(void)
{
u32 ctr = read_cpuid_cachetype();
if (!(ctr & BIT(CTR_EL0_IDC_SHIFT))) {
u64 clidr = read_sysreg(clidr_el1);
if (CLIDR_LOC(clidr) == 0 ||
(CLIDR_LOUIS(clidr) == 0 && CLIDR_LOUU(clidr) == 0))
ctr |= BIT(CTR_EL0_IDC_SHIFT);
}
return ctr;
}
#endif /* __ASSEMBLY__ */
#endif
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