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