41151e77a4
Enable hugepages on Freescale BookE processors. This allows the kernel to use huge TLB entries to map pages, which can greatly reduce the number of TLB misses and the amount of TLB thrashing experienced by applications with large memory footprints. Care should be taken when using this on FSL processors, as the number of large TLB entries supported by the core is low (16-64) on current processors. The supported set of hugepage sizes include 4m, 16m, 64m, 256m, and 1g. Page sizes larger than the max zone size are called "gigantic" pages and must be allocated on the command line (and cannot be deallocated). This is currently only fully implemented for Freescale 32-bit BookE processors, but there is some infrastructure in the code for 64-bit BooKE. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
#ifndef _ASM_POWERPC_HUGETLB_H
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#define _ASM_POWERPC_HUGETLB_H
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#ifdef CONFIG_HUGETLB_PAGE
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#include <asm/page.h>
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extern struct kmem_cache *hugepte_cache;
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extern void __init reserve_hugetlb_gpages(void);
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static inline pte_t *hugepd_page(hugepd_t hpd)
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{
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BUG_ON(!hugepd_ok(hpd));
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return (pte_t *)((hpd.pd & ~HUGEPD_SHIFT_MASK) | PD_HUGE);
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}
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static inline unsigned int hugepd_shift(hugepd_t hpd)
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{
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return hpd.pd & HUGEPD_SHIFT_MASK;
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}
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static inline pte_t *hugepte_offset(hugepd_t *hpdp, unsigned long addr,
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unsigned pdshift)
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{
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/*
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* On 32-bit, we have multiple higher-level table entries that point to
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* the same hugepte. Just use the first one since they're all
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* identical. So for that case, idx=0.
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*/
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unsigned long idx = 0;
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pte_t *dir = hugepd_page(*hpdp);
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#ifdef CONFIG_PPC64
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idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(*hpdp);
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#endif
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return dir + idx;
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}
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pte_t *huge_pte_offset_and_shift(struct mm_struct *mm,
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unsigned long addr, unsigned *shift);
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void flush_dcache_icache_hugepage(struct page *page);
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#if defined(CONFIG_PPC_MM_SLICES) || defined(CONFIG_PPC_SUBPAGE_PROT)
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int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
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unsigned long len);
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#else
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static inline int is_hugepage_only_range(struct mm_struct *mm,
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unsigned long addr,
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unsigned long len)
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{
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return 0;
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}
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#endif
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void book3e_hugetlb_preload(struct mm_struct *mm, unsigned long ea, pte_t pte);
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void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
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void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
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unsigned long end, unsigned long floor,
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unsigned long ceiling);
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/*
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* The version of vma_mmu_pagesize() in arch/powerpc/mm/hugetlbpage.c needs
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* to override the version in mm/hugetlb.c
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*/
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#define vma_mmu_pagesize vma_mmu_pagesize
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/*
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* If the arch doesn't supply something else, assume that hugepage
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* size aligned regions are ok without further preparation.
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*/
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static inline int prepare_hugepage_range(struct file *file,
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unsigned long addr, unsigned long len)
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{
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struct hstate *h = hstate_file(file);
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if (len & ~huge_page_mask(h))
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return -EINVAL;
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if (addr & ~huge_page_mask(h))
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return -EINVAL;
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return 0;
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}
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static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
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{
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}
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static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte)
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{
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set_pte_at(mm, addr, ptep, pte);
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}
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static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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#ifdef CONFIG_PPC64
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return __pte(pte_update(mm, addr, ptep, ~0UL, 1));
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#else
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return __pte(pte_update(ptep, ~0UL, 0));
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#endif
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}
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static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep)
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{
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pte_t pte;
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pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
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flush_tlb_page(vma, addr);
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}
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static inline int huge_pte_none(pte_t pte)
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{
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return pte_none(pte);
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}
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static inline pte_t huge_pte_wrprotect(pte_t pte)
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{
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return pte_wrprotect(pte);
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}
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static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep,
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pte_t pte, int dirty)
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{
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return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
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}
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static inline pte_t huge_ptep_get(pte_t *ptep)
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{
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return *ptep;
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}
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static inline int arch_prepare_hugepage(struct page *page)
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{
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return 0;
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}
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static inline void arch_release_hugepage(struct page *page)
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{
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}
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#else /* ! CONFIG_HUGETLB_PAGE */
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static inline void reserve_hugetlb_gpages(void)
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{
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pr_err("Cannot reserve gpages without hugetlb enabled\n");
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}
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static inline void flush_hugetlb_page(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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}
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#endif
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#endif /* _ASM_POWERPC_HUGETLB_H */
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