arch/sh/include/asm/pgalloc.h

   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 */