144 lines
4 KiB
C
144 lines
4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_BOOK3S_32_PGALLOC_H
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#define _ASM_POWERPC_BOOK3S_32_PGALLOC_H
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#include <linux/threads.h>
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#include <linux/slab.h>
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/*
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* Functions that deal with pagetables that could be at any level of
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* the table need to be passed an "index_size" so they know how to
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* handle allocation. For PTE pages (which are linked to a struct
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* page for now, and drawn from the main get_free_pages() pool), the
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* allocation size will be (2^index_size * sizeof(pointer)) and
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* allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
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*
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* The maximum index size needs to be big enough to allow any
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* pagetable sizes we need, but small enough to fit in the low bits of
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* any page table pointer. In other words all pagetables, even tiny
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* ones, must be aligned to allow at least enough low 0 bits to
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* contain this value. This value is also used as a mask, so it must
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* be one less than a power of two.
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*/
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#define MAX_PGTABLE_INDEX_SIZE 0xf
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extern void __bad_pte(pmd_t *pmd);
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extern struct kmem_cache *pgtable_cache[];
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#define PGT_CACHE(shift) ({ \
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BUG_ON(!(shift)); \
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pgtable_cache[(shift) - 1]; \
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})
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
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pgtable_gfp_flags(mm, GFP_KERNEL));
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}
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static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
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}
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/*
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* We don't have any real pmd's, and this code never triggers because
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* the pgd will always be present..
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*/
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/* #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) */
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#define pmd_free(mm, x) do { } while (0)
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#define __pmd_free_tlb(tlb,x,a) do { } while (0)
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/* #define pgd_populate(mm, pmd, pte) BUG() */
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#ifndef CONFIG_BOOKE
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static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
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pte_t *pte)
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{
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*pmdp = __pmd(__pa(pte) | _PMD_PRESENT);
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}
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static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
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pgtable_t pte_page)
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{
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*pmdp = __pmd((page_to_pfn(pte_page) << PAGE_SHIFT) | _PMD_PRESENT);
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}
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#define pmd_pgtable(pmd) pmd_page(pmd)
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#else
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static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
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pte_t *pte)
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{
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*pmdp = __pmd((unsigned long)pte | _PMD_PRESENT);
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}
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static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
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pgtable_t pte_page)
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{
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*pmdp = __pmd((unsigned long)lowmem_page_address(pte_page) | _PMD_PRESENT);
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}
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#define pmd_pgtable(pmd) pmd_page(pmd)
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#endif
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extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
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extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr);
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static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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{
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free_page((unsigned long)pte);
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}
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static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
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{
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pgtable_page_dtor(ptepage);
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__free_page(ptepage);
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}
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static inline void pgtable_free(void *table, unsigned index_size)
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{
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if (!index_size) {
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pgtable_page_dtor(virt_to_page(table));
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free_page((unsigned long)table);
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} else {
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BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
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kmem_cache_free(PGT_CACHE(index_size), table);
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}
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}
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#define check_pgt_cache() do { } while (0)
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#define get_hugepd_cache_index(x) (x)
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#ifdef CONFIG_SMP
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static inline void pgtable_free_tlb(struct mmu_gather *tlb,
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void *table, int shift)
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{
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unsigned long pgf = (unsigned long)table;
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BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
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pgf |= shift;
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tlb_remove_table(tlb, (void *)pgf);
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}
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static inline void __tlb_remove_table(void *_table)
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{
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void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
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unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
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pgtable_free(table, shift);
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}
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#else
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static inline void pgtable_free_tlb(struct mmu_gather *tlb,
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void *table, int shift)
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{
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pgtable_free(table, shift);
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}
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#endif
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static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
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unsigned long address)
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{
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pgtable_free_tlb(tlb, page_address(table), 0);
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}
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#endif /* _ASM_POWERPC_BOOK3S_32_PGALLOC_H */
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