From 82a1a1f3bfb628c4a44652349b94c66c7e8be7c9 Mon Sep 17 00:00:00 2001 From: Qinglin Pan <panqinglin2020@iscas.ac.cn> Date: Thu, 9 Feb 2023 21:16:46 +0800 Subject: riscv: mm: support Svnapot in hugetlb page Svnapot can be used to support 64KB hugetlb page, so it can become a new option when using hugetlbfs. Add a basic implementation of hugetlb page, and support 64KB as a size in it by using Svnapot. For test, boot kernel with command line contains "default_hugepagesz=64K hugepagesz=64K hugepages=20" and run a simple test like this: tools/testing/selftests/vm/map_hugetlb 1 16 And it should be passed. Signed-off-by: Qinglin Pan <panqinglin00@gmail.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20230209131647.17245-3-panqinglin00@gmail.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> --- arch/riscv/include/asm/hugetlb.h | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) (limited to 'arch/riscv/include/asm/hugetlb.h') diff --git a/arch/riscv/include/asm/hugetlb.h b/arch/riscv/include/asm/hugetlb.h index ec19d6afc896..fe6f23006641 100644 --- a/arch/riscv/include/asm/hugetlb.h +++ b/arch/riscv/include/asm/hugetlb.h @@ -2,7 +2,6 @@ #ifndef _ASM_RISCV_HUGETLB_H #define _ASM_RISCV_HUGETLB_H -#include <asm-generic/hugetlb.h> #include <asm/page.h> static inline void arch_clear_hugepage_flags(struct page *page) @@ -11,4 +10,37 @@ static inline void arch_clear_hugepage_flags(struct page *page) } #define arch_clear_hugepage_flags arch_clear_hugepage_flags +#ifdef CONFIG_RISCV_ISA_SVNAPOT +#define __HAVE_ARCH_HUGE_PTE_CLEAR +void huge_pte_clear(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, unsigned long sz); + +#define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT +void set_huge_pte_at(struct mm_struct *mm, + unsigned long addr, pte_t *ptep, pte_t pte); + +#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR +pte_t huge_ptep_get_and_clear(struct mm_struct *mm, + unsigned long addr, pte_t *ptep); + +#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH +pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep); + +#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT +void huge_ptep_set_wrprotect(struct mm_struct *mm, + unsigned long addr, pte_t *ptep); + +#define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS +int huge_ptep_set_access_flags(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, + pte_t pte, int dirty); + +pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags); +#define arch_make_huge_pte arch_make_huge_pte + +#endif /*CONFIG_RISCV_ISA_SVNAPOT*/ + +#include <asm-generic/hugetlb.h> + #endif /* _ASM_RISCV_HUGETLB_H */ -- cgit v1.2.3-70-g09d2