3c726f8dee
Adds a new CONFIG_PPC_64K_PAGES which, when enabled, changes the kernel base page size to 64K. The resulting kernel still boots on any hardware. On current machines with 4K pages support only, the kernel will maintain 16 "subpages" for each 64K page transparently. Note that while real 64K capable HW has been tested, the current patch will not enable it yet as such hardware is not released yet, and I'm still verifying with the firmware architects the proper to get the information from the newer hypervisors. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
152 lines
3.7 KiB
C
152 lines
3.7 KiB
C
#ifndef _PPC64_PGALLOC_H
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#define _PPC64_PGALLOC_H
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/cpumask.h>
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#include <linux/percpu.h>
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extern kmem_cache_t *pgtable_cache[];
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#ifdef CONFIG_PPC_64K_PAGES
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#define PTE_CACHE_NUM 0
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#define PMD_CACHE_NUM 0
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#define PGD_CACHE_NUM 1
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#else
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#define PTE_CACHE_NUM 0
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#define PMD_CACHE_NUM 1
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#define PUD_CACHE_NUM 1
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#define PGD_CACHE_NUM 0
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#endif
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
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}
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static inline void pgd_free(pgd_t *pgd)
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{
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kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd);
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}
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#ifndef CONFIG_PPC_64K_PAGES
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#define pgd_populate(MM, PGD, PUD) pgd_set(PGD, PUD)
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static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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return kmem_cache_alloc(pgtable_cache[PUD_CACHE_NUM],
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GFP_KERNEL|__GFP_REPEAT);
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}
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static inline void pud_free(pud_t *pud)
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{
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kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], pud);
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}
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static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
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{
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pud_set(pud, (unsigned long)pmd);
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}
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#define pmd_populate(mm, pmd, pte_page) \
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pmd_populate_kernel(mm, pmd, page_address(pte_page))
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#define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
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#else /* CONFIG_PPC_64K_PAGES */
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#define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd)
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static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
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pte_t *pte)
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{
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pmd_set(pmd, (unsigned long)pte);
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}
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#define pmd_populate(mm, pmd, pte_page) \
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pmd_populate_kernel(mm, pmd, page_address(pte_page))
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#endif /* CONFIG_PPC_64K_PAGES */
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static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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return kmem_cache_alloc(pgtable_cache[PMD_CACHE_NUM],
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GFP_KERNEL|__GFP_REPEAT);
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}
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static inline void pmd_free(pmd_t *pmd)
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{
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kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
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}
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
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unsigned long address)
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{
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return kmem_cache_alloc(pgtable_cache[PTE_CACHE_NUM],
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GFP_KERNEL|__GFP_REPEAT);
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}
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static inline struct page *pte_alloc_one(struct mm_struct *mm,
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unsigned long address)
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{
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return virt_to_page(pte_alloc_one_kernel(mm, address));
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}
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static inline void pte_free_kernel(pte_t *pte)
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{
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kmem_cache_free(pgtable_cache[PTE_CACHE_NUM], pte);
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}
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static inline void pte_free(struct page *ptepage)
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{
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pte_free_kernel(page_address(ptepage));
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}
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#define PGF_CACHENUM_MASK 0xf
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typedef struct pgtable_free {
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unsigned long val;
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} pgtable_free_t;
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static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
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unsigned long mask)
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{
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BUG_ON(cachenum > PGF_CACHENUM_MASK);
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return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
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}
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static inline void pgtable_free(pgtable_free_t pgf)
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{
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void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
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int cachenum = pgf.val & PGF_CACHENUM_MASK;
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kmem_cache_free(pgtable_cache[cachenum], p);
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}
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extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
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#define __pte_free_tlb(tlb, ptepage) \
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pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
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PTE_CACHE_NUM, PTE_TABLE_SIZE-1))
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#define __pmd_free_tlb(tlb, pmd) \
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pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
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PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
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#ifndef CONFIG_PPC_64K_PAGES
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#define __pud_free_tlb(tlb, pmd) \
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pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
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PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
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#endif /* CONFIG_PPC_64K_PAGES */
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#define check_pgt_cache() do { } while (0)
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#endif /* _PPC64_PGALLOC_H */
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