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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright(c) 2017 IBM Corporation. All rights reserved.
*/
#include <linux/string.h>
#include <linux/export.h>
#include <linux/uaccess.h>
#include <linux/libnvdimm.h>
#include <asm/cacheflush.h>
static inline void __clean_pmem_range(unsigned long start, unsigned long stop)
{
unsigned long shift = l1_dcache_shift();
unsigned long bytes = l1_dcache_bytes();
void *addr = (void *)(start & ~(bytes - 1));
unsigned long size = stop - (unsigned long)addr + (bytes - 1);
unsigned long i;
for (i = 0; i < size >> shift; i++, addr += bytes)
asm volatile(PPC_DCBSTPS(%0, %1): :"i"(0), "r"(addr): "memory");
}
static inline void __flush_pmem_range(unsigned long start, unsigned long stop)
{
unsigned long shift = l1_dcache_shift();
unsigned long bytes = l1_dcache_bytes();
void *addr = (void *)(start & ~(bytes - 1));
unsigned long size = stop - (unsigned long)addr + (bytes - 1);
unsigned long i;
for (i = 0; i < size >> shift; i++, addr += bytes)
asm volatile(PPC_DCBFPS(%0, %1): :"i"(0), "r"(addr): "memory");
}
static inline void clean_pmem_range(unsigned long start, unsigned long stop)
{
if (cpu_has_feature(CPU_FTR_ARCH_207S))
return __clean_pmem_range(start, stop);
}
static inline void flush_pmem_range(unsigned long start, unsigned long stop)
{
if (cpu_has_feature(CPU_FTR_ARCH_207S))
return __flush_pmem_range(start, stop);
}
/*
* CONFIG_ARCH_HAS_PMEM_API symbols
*/
void arch_wb_cache_pmem(void *addr, size_t size)
{
unsigned long start = (unsigned long) addr;
clean_pmem_range(start, start + size);
}
EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
void arch_invalidate_pmem(void *addr, size_t size)
{
unsigned long start = (unsigned long) addr;
flush_pmem_range(start, start + size);
}
EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
/*
* CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE symbols
*/
long __copy_from_user_flushcache(void *dest, const void __user *src,
unsigned size)
{
unsigned long copied, start = (unsigned long) dest;
copied = __copy_from_user(dest, src, size);
clean_pmem_range(start, start + size);
return copied;
}
void memcpy_flushcache(void *dest, const void *src, size_t size)
{
unsigned long start = (unsigned long) dest;
memcpy(dest, src, size);
clean_pmem_range(start, start + size);
}
EXPORT_SYMBOL(memcpy_flushcache);
void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
size_t len)
{
memcpy_flushcache(to, page_to_virt(page) + offset, len);
}
EXPORT_SYMBOL(memcpy_page_flushcache);
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