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Diffstat (limited to '')
| -rw-r--r-- | arch/s390/include/asm/pgalloc.h | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgalloc.h b/arch/s390/include/asm/pgalloc.h new file mode 100644 index 000000000..67838df3f --- /dev/null +++ b/arch/s390/include/asm/pgalloc.h @@ -0,0 +1,169 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * S390 version + * Copyright IBM Corp. 1999, 2000 + * Author(s): Hartmut Penner (hp@de.ibm.com) + * Martin Schwidefsky (schwidefsky@de.ibm.com) + * + * Derived from "include/asm-i386/pgalloc.h" + * Copyright (C) 1994 Linus Torvalds + */ + +#ifndef _S390_PGALLOC_H +#define _S390_PGALLOC_H + +#include <linux/threads.h> +#include <linux/string.h> +#include <linux/gfp.h> +#include <linux/mm.h> + +#define CRST_ALLOC_ORDER 2 + +unsigned long *crst_table_alloc(struct mm_struct *); +void crst_table_free(struct mm_struct *, unsigned long *); + +unsigned long *page_table_alloc(struct mm_struct *); +struct page *page_table_alloc_pgste(struct mm_struct *mm); +void page_table_free(struct mm_struct *, unsigned long *); +void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long); +void page_table_free_pgste(struct page *page); +extern int page_table_allocate_pgste; + +static inline void crst_table_init(unsigned long *crst, unsigned long entry) +{ + memset64((u64 *)crst, entry, _CRST_ENTRIES); +} + +static inline unsigned long pgd_entry_type(struct mm_struct *mm) +{ + if (mm_pmd_folded(mm)) + return _SEGMENT_ENTRY_EMPTY; + if (mm_pud_folded(mm)) + return _REGION3_ENTRY_EMPTY; + if (mm_p4d_folded(mm)) + return _REGION2_ENTRY_EMPTY; + return _REGION1_ENTRY_EMPTY; +} + +int crst_table_upgrade(struct mm_struct *mm, unsigned long limit); +void crst_table_downgrade(struct mm_struct *); + +static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address) +{ + unsigned long *table = crst_table_alloc(mm); + + if (table) + crst_table_init(table, _REGION2_ENTRY_EMPTY); + return (p4d_t *) table; +} + +static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d) +{ + if (!mm_p4d_folded(mm)) + crst_table_free(mm, (unsigned long *) p4d); +} + +static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) +{ + unsigned long *table = crst_table_alloc(mm); + if (table) + crst_table_init(table, _REGION3_ENTRY_EMPTY); + return (pud_t *) table; +} + +static inline void pud_free(struct mm_struct *mm, pud_t *pud) +{ + if (!mm_pud_folded(mm)) + crst_table_free(mm, (unsigned long *) pud); +} + +static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) +{ + unsigned long *table = crst_table_alloc(mm); + + if (!table) + return NULL; + crst_table_init(table, _SEGMENT_ENTRY_EMPTY); + if (!pgtable_pmd_page_ctor(virt_to_page(table))) { + crst_table_free(mm, table); + return NULL; + } + return (pmd_t *) table; +} + +static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) +{ + if (mm_pmd_folded(mm)) + return; + pgtable_pmd_page_dtor(virt_to_page(pmd)); + crst_table_free(mm, (unsigned long *) pmd); +} + +static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) +{ + pgd_val(*pgd) = _REGION1_ENTRY | __pa(p4d); +} + +static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) +{ + p4d_val(*p4d) = _REGION2_ENTRY | __pa(pud); +} + +static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) +{ + pud_val(*pud) = _REGION3_ENTRY | __pa(pmd); +} + +static inline pgd_t *pgd_alloc(struct mm_struct *mm) +{ + unsigned long *table = crst_table_alloc(mm); + + if (!table) + return NULL; + if (mm->context.asce_limit == _REGION3_SIZE) { + /* Forking a compat process with 2 page table levels */ + if (!pgtable_pmd_page_ctor(virt_to_page(table))) { + crst_table_free(mm, table); + return NULL; + } + } + return (pgd_t *) table; +} + +static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) +{ + if (mm->context.asce_limit == _REGION3_SIZE) + pgtable_pmd_page_dtor(virt_to_page(pgd)); + crst_table_free(mm, (unsigned long *) pgd); +} + +static inline void pmd_populate(struct mm_struct *mm, + pmd_t *pmd, pgtable_t pte) +{ + pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte); +} + +#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte) + +#define pmd_pgtable(pmd) \ + (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE) + +/* + * page table entry allocation/free routines. + */ +#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm)) +#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm)) + +#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte) +#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte) + +extern void rcu_table_freelist_finish(void); + +void vmem_map_init(void); +void *vmem_crst_alloc(unsigned long val); +pte_t *vmem_pte_alloc(void); + +unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages); +void base_asce_free(unsigned long asce); + +#endif /* _S390_PGALLOC_H */ |