Commit 0c6378a7 authored by Mike Rapoport (Microsoft)'s avatar Mike Rapoport (Microsoft) Committed by Andrew Morton
Browse files

arch: introduce set_direct_map_valid_noflush() 

Add an API that will allow updates of the direct/linear map for a set of
physically contiguous pages.

It will be used in the following patches.

Link: https://lkml.kernel.org/r/20241023162711.2579610-6-rppt@kernel.org


Signed-off-by: default avatarMike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarLuis Chamberlain <mcgrof@kernel.org>
Tested-by: default avatarkdevops <kdevops@lists.linux.dev>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Brian Cain <bcain@quicinc.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Song Liu <song@kernel.org>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 0c133b1e

arch/arm64/include/asm/set_memory.h

+1 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ int set_memory_valid(unsigned long addr, int numpages, int enable); 


int set_direct_map_invalid_noflush(struct page *page);

int set_direct_map_default_noflush(struct page *page);

int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid);

bool kernel_page_present(struct page *page);



#endif /* _ASM_ARM64_SET_MEMORY_H */

arch/arm64/mm/pageattr.c

+10 −0
Original line number Diff line number Diff line
@@ -192,6 +192,16 @@ int set_direct_map_default_noflush(struct page *page) 
				   PAGE_SIZE, change_page_range, &data);

}



int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid)

{

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



	if (!can_set_direct_map())

		return 0;



	return set_memory_valid(addr, nr, valid);

}



#ifdef CONFIG_DEBUG_PAGEALLOC

void __kernel_map_pages(struct page *page, int numpages, int enable)

{

arch/loongarch/include/asm/set_memory.h

+1 −0
Original line number Diff line number Diff line
@@ -17,5 +17,6 @@ int set_memory_rw(unsigned long addr, int numpages); 
bool kernel_page_present(struct page *page);

int set_direct_map_default_noflush(struct page *page);

int set_direct_map_invalid_noflush(struct page *page);

int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid);



#endif /* _ASM_LOONGARCH_SET_MEMORY_H */

arch/loongarch/mm/pageattr.c

+19 −0
Original line number Diff line number Diff line
@@ -216,3 +216,22 @@ int set_direct_map_invalid_noflush(struct page *page) 


	return __set_memory(addr, 1, __pgprot(0), __pgprot(_PAGE_PRESENT | _PAGE_VALID));

}



int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid)

{

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

	pgprot_t set, clear;



	if (addr < vm_map_base)

		return 0;



	if (valid) {

		set = PAGE_KERNEL;

		clear = __pgprot(0);

	} else {

		set = __pgprot(0);

		clear = __pgprot(_PAGE_PRESENT | _PAGE_VALID);

	}



	return __set_memory(addr, 1, set, clear);

}

arch/riscv/include/asm/set_memory.h

+1 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ static inline int set_kernel_memory(char *startp, char *endp, 


int set_direct_map_invalid_noflush(struct page *page);

int set_direct_map_default_noflush(struct page *page);

int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid);

bool kernel_page_present(struct page *page);



#endif /* __ASSEMBLY__ */