forked from Minki/linux
6c96020882
flush_dcache_page() is only a few lines, it is worth inlining. ia64, csky, mips, openrisc and riscv have a similar flush_dcache_page() and inline it. On pmac32_defconfig, we get a small size reduction. On ppc64_defconfig, we get a very small size increase. In both case that's in the noise (less than 0.1%). text data bss dec hex filename 18991155 5934744149762426423523 19330e3 vmlinux64.before 189948295936732149762426429185 1934701 vmlinux64.after 9150963 2467502 184548 11803013 b41985 vmlinux32.before91496892467302 184548 11801539 b413c3 vmlinux32.after Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/21c417488b70b7629dae316539fb7bb8bdef4fdd.1617895813.git.christophe.leroy@csgroup.eu
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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*/
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#ifndef _ASM_POWERPC_CACHEFLUSH_H
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#define _ASM_POWERPC_CACHEFLUSH_H
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#include <linux/mm.h>
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#include <asm/cputable.h>
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#include <asm/cpu_has_feature.h>
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/*
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* This flag is used to indicate that the page pointed to by a pte is clean
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* and does not require cleaning before returning it to the user.
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*/
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#define PG_dcache_clean PG_arch_1
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#ifdef CONFIG_PPC_BOOK3S_64
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/*
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* Book3s has no ptesync after setting a pte, so without this ptesync it's
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* possible for a kernel virtual mapping access to return a spurious fault
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* if it's accessed right after the pte is set. The page fault handler does
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* not expect this type of fault. flush_cache_vmap is not exactly the right
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* place to put this, but it seems to work well enough.
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*/
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static inline void flush_cache_vmap(unsigned long start, unsigned long end)
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{
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asm volatile("ptesync" ::: "memory");
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}
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#define flush_cache_vmap flush_cache_vmap
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#endif /* CONFIG_PPC_BOOK3S_64 */
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#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
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/*
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* This is called when a page has been modified by the kernel.
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* It just marks the page as not i-cache clean. We do the i-cache
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* flush later when the page is given to a user process, if necessary.
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*/
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static inline void flush_dcache_page(struct page *page)
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{
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if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
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return;
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/* avoid an atomic op if possible */
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if (test_bit(PG_dcache_clean, &page->flags))
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clear_bit(PG_dcache_clean, &page->flags);
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}
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void flush_icache_range(unsigned long start, unsigned long stop);
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#define flush_icache_range flush_icache_range
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void flush_icache_user_page(struct vm_area_struct *vma, struct page *page,
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unsigned long addr, int len);
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#define flush_icache_user_page flush_icache_user_page
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void flush_dcache_icache_page(struct page *page);
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/**
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* flush_dcache_range(): Write any modified data cache blocks out to memory and
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* invalidate them. Does not invalidate the corresponding instruction cache
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* blocks.
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*
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* @start: the start address
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* @stop: the stop address (exclusive)
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*/
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static inline void flush_dcache_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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if (IS_ENABLED(CONFIG_PPC64))
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mb(); /* sync */
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for (i = 0; i < size >> shift; i++, addr += bytes)
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dcbf(addr);
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mb(); /* sync */
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}
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/*
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* Write any modified data cache blocks out to memory.
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* Does not invalidate the corresponding cache lines (especially for
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* any corresponding instruction cache).
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*/
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static inline void clean_dcache_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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dcbst(addr);
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mb(); /* sync */
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}
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/*
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* Like above, but invalidate the D-cache. This is used by the 8xx
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* to invalidate the cache so the PPC core doesn't get stale data
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* from the CPM (no cache snooping here :-).
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*/
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static inline void invalidate_dcache_range(unsigned long start,
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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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dcbi(addr);
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mb(); /* sync */
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}
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#ifdef CONFIG_4xx
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static inline void flush_instruction_cache(void)
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{
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iccci((void *)KERNELBASE);
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isync();
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}
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#else
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void flush_instruction_cache(void);
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#endif
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#include <asm-generic/cacheflush.h>
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#endif /* _ASM_POWERPC_CACHEFLUSH_H */
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