Unverified Commit 395a21ff authored by Zong Li's avatar Zong Li Committed by Palmer Dabbelt
Browse files

riscv: add ARCH_HAS_SET_DIRECT_MAP support 



Add set_direct_map_*() functions for setting the direct map alias for
the page to its default permissions and to an invalid state that cannot
be cached in a TLB. (See d253ca0c ("x86/mm/cpa: Add set_direct_map_*()
functions")) Add a similar implementation for RISC-V.

Signed-off-by: default avatarZong Li <zong.li@sifive.com>
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent d3ab332a

arch/riscv/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -59,6 +59,7 @@ config RISCV 
	select HAVE_EBPF_JIT if 64BIT

	select EDAC_SUPPORT

	select ARCH_HAS_GIGANTIC_PAGE

	select ARCH_HAS_SET_DIRECT_MAP

	select ARCH_HAS_SET_MEMORY

	select ARCH_WANT_HUGE_PMD_SHARE if 64BIT

	select SPARSEMEM_STATIC if 32BIT

arch/riscv/include/asm/set_memory.h

+3 −0
Original line number Diff line number Diff line
@@ -21,4 +21,7 @@ static inline int set_memory_x(unsigned long addr, int numpages) { return 0; } 
static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }

#endif



int set_direct_map_invalid_noflush(struct page *page);

int set_direct_map_default_noflush(struct page *page);



#endif /* _ASM_RISCV_SET_MEMORY_H */

arch/riscv/mm/pageattr.c

+24 −0
Original line number Diff line number Diff line
@@ -148,3 +148,27 @@ int set_memory_nx(unsigned long addr, int numpages) 
{

	return __set_memory(addr, numpages, __pgprot(0), __pgprot(_PAGE_EXEC));

}



int set_direct_map_invalid_noflush(struct page *page)

{

	unsigned long start = (unsigned long)page_address(page);

	unsigned long end = start + PAGE_SIZE;

	struct pageattr_masks masks = {

		.set_mask = __pgprot(0),

		.clear_mask = __pgprot(_PAGE_PRESENT)

	};



	return walk_page_range(&init_mm, start, end, &pageattr_ops, &masks);

}



int set_direct_map_default_noflush(struct page *page)

{

	unsigned long start = (unsigned long)page_address(page);

	unsigned long end = start + PAGE_SIZE;

	struct pageattr_masks masks = {

		.set_mask = PAGE_KERNEL,

		.clear_mask = __pgprot(0)

	};



	return walk_page_range(&init_mm, start, end, &pageattr_ops, &masks);

}

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