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linux/arch/powerpc/include/asm/slice.h

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powerpc/mm/slice: create header files dedicated to slices In preparation for the following patch which will enhance 'slices' for supporting PPC32 in order to fix an issue on hugepages on 8xx, this patch takes out of page*.h all bits related to 'slices' and put them into newly created slice.h header files. While common parts go into asm/slice.h, subarch specific parts go into respective books3s/64/slice.c and nohash/64/slice.c 'slices' Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-02-22 22:27:22 +08:00
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_SLICE_H
#define _ASM_POWERPC_SLICE_H
#ifdef CONFIG_PPC_BOOK3S_64
#include <asm/book3s/64/slice.h>
powerpc/mm/slice: Enhance for supporting PPC32 In preparation for the following patch which will fix an issue on the 8xx by re-using the 'slices', this patch enhances the 'slices' implementation to support 32 bits CPUs. On PPC32, the address space is limited to 4Gbytes, hence only the low slices will be used. The high slices use bitmaps. As bitmap functions are not prepared to handle bitmaps of size 0, this patch ensures that bitmap functions are called only when SLICE_NUM_HIGH is not nul. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-02-22 22:27:24 +08:00
#elif defined(CONFIG_PPC64)
powerpc/mm/slice: create header files dedicated to slices In preparation for the following patch which will enhance 'slices' for supporting PPC32 in order to fix an issue on hugepages on 8xx, this patch takes out of page*.h all bits related to 'slices' and put them into newly created slice.h header files. While common parts go into asm/slice.h, subarch specific parts go into respective books3s/64/slice.c and nohash/64/slice.c 'slices' Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-02-22 22:27:22 +08:00
#include <asm/nohash/64/slice.h>
powerpc/mm/slice: Enhance for supporting PPC32 In preparation for the following patch which will fix an issue on the 8xx by re-using the 'slices', this patch enhances the 'slices' implementation to support 32 bits CPUs. On PPC32, the address space is limited to 4Gbytes, hence only the low slices will be used. The high slices use bitmaps. As bitmap functions are not prepared to handle bitmaps of size 0, this patch ensures that bitmap functions are called only when SLICE_NUM_HIGH is not nul. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-02-22 22:27:24 +08:00
#elif defined(CONFIG_PPC_MMU_NOHASH)
#include <asm/nohash/32/slice.h>
powerpc/mm/slice: create header files dedicated to slices In preparation for the following patch which will enhance 'slices' for supporting PPC32 in order to fix an issue on hugepages on 8xx, this patch takes out of page*.h all bits related to 'slices' and put them into newly created slice.h header files. While common parts go into asm/slice.h, subarch specific parts go into respective books3s/64/slice.c and nohash/64/slice.c 'slices' Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-02-22 22:27:22 +08:00
#endif
#ifdef CONFIG_PPC_MM_SLICES
#ifdef CONFIG_HUGETLB_PAGE
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#endif
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
#ifndef __ASSEMBLY__
struct mm_struct;
unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
unsigned long flags, unsigned int psize,
int topdown);
unsigned int get_slice_psize(struct mm_struct *mm, unsigned long addr);
void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
unsigned long len, unsigned int psize);
powerpc/mm/slice: Simplify and optimise slice context initialisation The slice state of an mm gets zeroed then initialised upon exec. This is the only caller of slice_set_user_psize now, so that can be removed and instead implement a faster and simplified approach that requires no locking or checking existing state. This speeds up vfork+exec+exit performance on POWER8 by 3%. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-03-07 09:37:09 +08:00
void slice_init_new_context_exec(struct mm_struct *mm);
powerpc/64s/hash: Provide arch_setup_exec() hooks for hash slice setup This will be used by the SLB code in the next patch, but for now this sets the slb_addr_limit to the correct size for 32-bit tasks. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-09-14 23:30:55 +08:00
void slice_setup_new_exec(void);
powerpc/mm/slice: Simplify and optimise slice context initialisation The slice state of an mm gets zeroed then initialised upon exec. This is the only caller of slice_set_user_psize now, so that can be removed and instead implement a faster and simplified approach that requires no locking or checking existing state. This speeds up vfork+exec+exit performance on POWER8 by 3%. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-03-07 09:37:09 +08:00
#endif /* __ASSEMBLY__ */
powerpc/mm/slice: create header files dedicated to slices In preparation for the following patch which will enhance 'slices' for supporting PPC32 in order to fix an issue on hugepages on 8xx, this patch takes out of page*.h all bits related to 'slices' and put them into newly created slice.h header files. While common parts go into asm/slice.h, subarch specific parts go into respective books3s/64/slice.c and nohash/64/slice.c 'slices' Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-02-22 22:27:22 +08:00
#endif /* CONFIG_PPC_MM_SLICES */
#endif /* _ASM_POWERPC_SLICE_H */