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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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32ce3862af
Implement the architecture specific cache maintence functions that make up the "PMEM API". Currently the writeback and invalidate functions are the same since the function of the DCBST (data cache block store) instruction is typically interpreted as "writeback to the point of coherency" rather than to memory. As a result implementing the API requires a full cache flush rather than just a cache write back. This will probably change in the not-too-distant future. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
35 lines
1001 B
C
35 lines
1001 B
C
/*
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* Copyright(c) 2017 IBM Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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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 <asm/cacheflush.h>
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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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flush_inval_dcache_range(start, start + size);
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}
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EXPORT_SYMBOL(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_inval_dcache_range(start, start + size);
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}
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EXPORT_SYMBOL(arch_invalidate_pmem);
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