| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef __ASM_SH_PGALLOC_H |
| 3 | #define __ASM_SH_PGALLOC_H |
| 4 | |
| 5 | #include <linux/quicklist.h> |
| 6 | #include <asm/page.h> |
| 7 | |
| 8 | #define QUICK_PT 0 /* Other page table pages that are zero on free */ |
| 9 | |
| 10 | extern pgd_t *pgd_alloc(struct mm_struct *); |
| 11 | extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); |
| 12 | |
| 13 | #if PAGETABLE_LEVELS > 2 |
| 14 | extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd); |
| 15 | extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address); |
| 16 | extern void pmd_free(struct mm_struct *mm, pmd_t *pmd); |
| 17 | #endif |
| 18 | |
| 19 | static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, |
| 20 | pte_t *pte) |
| 21 | { |
| 22 | set_pmd(pmd, __pmd((unsigned long)pte)); |
| 23 | } |
| 24 | |
| 25 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, |
| 26 | pgtable_t pte) |
| 27 | { |
| 28 | set_pmd(pmd, __pmd((unsigned long)page_address(pte))); |
| 29 | } |
| 30 | #define pmd_pgtable(pmd) pmd_page(pmd) |
| 31 | |
| 32 | /* |
| 33 | * Allocate and free page tables. |
| 34 | */ |
| 35 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, |
| 36 | unsigned long address) |
| 37 | { |
| 38 | return quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL); |
| 39 | } |
| 40 | |
| 41 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm, |
| 42 | unsigned long address) |
| 43 | { |
| 44 | struct page *page; |
| 45 | void *pg; |
| 46 | |
| 47 | pg = quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL); |
| 48 | if (!pg) |
| 49 | return NULL; |
| 50 | page = virt_to_page(pg); |
| 51 | if (!pgtable_page_ctor(page)) { |
| 52 | quicklist_free(QUICK_PT, NULL, pg); |
| 53 | return NULL; |
| 54 | } |
| 55 | return page; |
| 56 | } |
| 57 | |
| 58 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
| 59 | { |
| 60 | quicklist_free(QUICK_PT, NULL, pte); |
| 61 | } |
| 62 | |
| 63 | static inline void pte_free(struct mm_struct *mm, pgtable_t pte) |
| 64 | { |
| 65 | pgtable_page_dtor(pte); |
| 66 | quicklist_free_page(QUICK_PT, NULL, pte); |
| 67 | } |
| 68 | |
| 69 | #define __pte_free_tlb(tlb,pte,addr) \ |
| 70 | do { \ |
| 71 | pgtable_page_dtor(pte); \ |
| 72 | tlb_remove_page((tlb), (pte)); \ |
| 73 | } while (0) |
| 74 | |
| 75 | static inline void check_pgt_cache(void) |
| 76 | { |
| 77 | quicklist_trim(QUICK_PT, NULL, 25, 16); |
| 78 | } |
| 79 | |
| 80 | #endif /* __ASM_SH_PGALLOC_H */ |