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#ifndef _ASM_POWERPC_HUGETLB_H
#define _ASM_POWERPC_HUGETLB_H
#ifdef CONFIG_HUGETLB_PAGE
#include <asm/page.h>
#include <asm-generic/hugetlb.h>
extern struct kmem_cache *hugepte_cache;
#ifdef CONFIG_PPC_BOOK3S_64
/*
* This should work for other subarchs too. But right now we use the
* new format only for 64bit book3s
*/
static inline pte_t *hugepd_page(hugepd_t hpd)
{
BUG_ON(!hugepd_ok(hpd));
/*
* We have only four bits to encode, MMU page size
*/
BUILD_BUG_ON((MMU_PAGE_COUNT - 1) > 0xf);
return (pte_t *)(hpd.pd & ~HUGEPD_SHIFT_MASK);
}
static inline unsigned int hugepd_mmu_psize(hugepd_t hpd)
{
return (hpd.pd & HUGEPD_SHIFT_MASK) >> 2;
}
static inline unsigned int hugepd_shift(hugepd_t hpd)
{
return mmu_psize_to_shift(hugepd_mmu_psize(hpd));
}
#else
static inline pte_t *hugepd_page(hugepd_t hpd)
{
BUG_ON(!hugepd_ok(hpd));
return (pte_t *)((hpd.pd & ~HUGEPD_SHIFT_MASK) | PD_HUGE);
}
static inline unsigned int hugepd_shift(hugepd_t hpd)
{
return hpd.pd & HUGEPD_SHIFT_MASK;
}
#endif /* CONFIG_PPC_BOOK3S_64 */
static inline pte_t *hugepte_offset(hugepd_t *hpdp, unsigned long addr,
unsigned pdshift)
{
/*
* On FSL BookE, we have multiple higher-level table entries that
* point to the same hugepte. Just use the first one since they're all
* identical. So for that case, idx=0.
*/
unsigned long idx = 0;
pte_t *dir = hugepd_page(*hpdp);
#ifndef CONFIG_PPC_FSL_BOOK3E
idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(*hpdp);
#endif
return dir + idx;
}
pte_t *huge_pte_offset_and_shift(struct mm_struct *mm,
unsigned long addr, unsigned *shift);
void flush_dcache_icache_hugepage(struct page *page);
#if defined(CONFIG_PPC_MM_SLICES) || defined(CONFIG_PPC_SUBPAGE_PROT)
int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
unsigned long len);
#else
static inline int is_hugepage_only_range(struct mm_struct *mm,
unsigned long addr,
unsigned long len)
{
return 0;
}
#endif
void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
pte_t pte);
void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
unsigned long end, unsigned long floor,
unsigned long ceiling);
/*
* The version of vma_mmu_pagesize() in arch/powerpc/mm/hugetlbpage.c needs
* to override the version in mm/hugetlb.c
*/
#define vma_mmu_pagesize vma_mmu_pagesize
/*
* If the arch doesn't supply something else, assume that hugepage
* size aligned regions are ok without further preparation.
*/
static inline int prepare_hugepage_range(struct file *file,
unsigned long addr, unsigned long len)
{
struct hstate *h = hstate_file(file);
if (len & ~huge_page_mask(h))
return -EINVAL;
if (addr & ~huge_page_mask(h))
return -EINVAL;
return 0;
}
static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
{
}
static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
set_pte_at(mm, addr, ptep, pte);
}
static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
#ifdef CONFIG_PPC64
return __pte(pte_update(mm, addr, ptep, ~0UL, 0, 1));
#else
return __pte(pte_update(ptep, ~0UL, 0));
#endif
}
static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep)
{
pte_t pte;
pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
flush_tlb_page(vma, addr);
}
static inline int huge_pte_none(pte_t pte)
{
return pte_none(pte);
}
static inline pte_t huge_pte_wrprotect(pte_t pte)
{
return pte_wrprotect(pte);
}
static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep,
pte_t pte, int dirty)
{
#ifdef HUGETLB_NEED_PRELOAD
/*
* The "return 1" forces a call of update_mmu_cache, which will write a
* TLB entry. Without this, platforms that don't do a write of the TLB
* entry in the TLB miss handler asm will fault ad infinitum.
*/
ptep_set_access_flags(vma, addr, ptep, pte, dirty);
return 1;
#else
return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
#endif
}
static inline pte_t huge_ptep_get(pte_t *ptep)
{
return *ptep;
}
static inline int arch_prepare_hugepage(struct page *page)
{
return 0;
}
static inline void arch_release_hugepage(struct page *page)
{
}
static inline void arch_clear_hugepage_flags(struct page *page)
{
}
#else /* ! CONFIG_HUGETLB_PAGE */
static inline void flush_hugetlb_page(struct vm_area_struct *vma,
unsigned long vmaddr)
{
}
#define hugepd_shift(x) 0
static inline pte_t *hugepte_offset(hugepd_t *hpdp, unsigned long addr,
unsigned pdshift)
{
return 0;
}
#endif /* CONFIG_HUGETLB_PAGE */
/*
* FSL Book3E platforms require special gpage handling - the gpages
* are reserved early in the boot process by memblock instead of via
* the .dts as on IBM platforms.
*/
#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_FSL_BOOK3E)
extern void __init reserve_hugetlb_gpages(void);
#else
static inline void reserve_hugetlb_gpages(void)
{
}
#endif
#endif /* _ASM_POWERPC_HUGETLB_H */
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