diff options
Diffstat (limited to 'arch/powerpc/include/asm/book3s/64/hash-4k.h')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/hash-4k.h | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/hash-4k.h b/arch/powerpc/include/asm/book3s/64/hash-4k.h new file mode 100644 index 000000000..fc68c0fc0 --- /dev/null +++ b/arch/powerpc/include/asm/book3s/64/hash-4k.h @@ -0,0 +1,156 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_BOOK3S_64_HASH_4K_H +#define _ASM_POWERPC_BOOK3S_64_HASH_4K_H +/* + * Entries per page directory level. The PTE level must use a 64b record + * for each page table entry. The PMD and PGD level use a 32b record for + * each entry by assuming that each entry is page aligned. + */ +#define H_PTE_INDEX_SIZE 9 +#define H_PMD_INDEX_SIZE 7 +#define H_PUD_INDEX_SIZE 9 +#define H_PGD_INDEX_SIZE 9 + +/* + * Each context is 512TB. But on 4k we restrict our max TASK size to 64TB + * Hence also limit max EA bits to 64TB. + */ +#define MAX_EA_BITS_PER_CONTEXT 46 + +#ifndef __ASSEMBLY__ +#define H_PTE_TABLE_SIZE (sizeof(pte_t) << H_PTE_INDEX_SIZE) +#define H_PMD_TABLE_SIZE (sizeof(pmd_t) << H_PMD_INDEX_SIZE) +#define H_PUD_TABLE_SIZE (sizeof(pud_t) << H_PUD_INDEX_SIZE) +#define H_PGD_TABLE_SIZE (sizeof(pgd_t) << H_PGD_INDEX_SIZE) + +#define H_PAGE_F_GIX_SHIFT 53 +#define H_PAGE_F_SECOND _RPAGE_RPN44 /* HPTE is in 2ndary HPTEG */ +#define H_PAGE_F_GIX (_RPAGE_RPN43 | _RPAGE_RPN42 | _RPAGE_RPN41) +#define H_PAGE_BUSY _RPAGE_RSV1 /* software: PTE & hash are busy */ +#define H_PAGE_HASHPTE _RPAGE_RSV2 /* software: PTE & hash are busy */ + +/* PTE flags to conserve for HPTE identification */ +#define _PAGE_HPTEFLAGS (H_PAGE_BUSY | H_PAGE_HASHPTE | \ + H_PAGE_F_SECOND | H_PAGE_F_GIX) +/* + * Not supported by 4k linux page size + */ +#define H_PAGE_4K_PFN 0x0 +#define H_PAGE_THP_HUGE 0x0 +#define H_PAGE_COMBO 0x0 + +/* 8 bytes per each pte entry */ +#define H_PTE_FRAG_SIZE_SHIFT (H_PTE_INDEX_SIZE + 3) +#define H_PTE_FRAG_NR (PAGE_SIZE >> H_PTE_FRAG_SIZE_SHIFT) +#define H_PMD_FRAG_SIZE_SHIFT (H_PMD_INDEX_SIZE + 3) +#define H_PMD_FRAG_NR (PAGE_SIZE >> H_PMD_FRAG_SIZE_SHIFT) + +/* memory key bits, only 8 keys supported */ +#define H_PTE_PKEY_BIT0 0 +#define H_PTE_PKEY_BIT1 0 +#define H_PTE_PKEY_BIT2 _RPAGE_RSV3 +#define H_PTE_PKEY_BIT3 _RPAGE_RSV4 +#define H_PTE_PKEY_BIT4 _RPAGE_RSV5 + +/* + * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range() + */ +#define remap_4k_pfn(vma, addr, pfn, prot) \ + remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot)) + +#ifdef CONFIG_HUGETLB_PAGE +static inline int hash__hugepd_ok(hugepd_t hpd) +{ + unsigned long hpdval = hpd_val(hpd); + /* + * if it is not a pte and have hugepd shift mask + * set, then it is a hugepd directory pointer + */ + if (!(hpdval & _PAGE_PTE) && + ((hpdval & HUGEPD_SHIFT_MASK) != 0)) + return true; + return false; +} +#endif + +/* + * 4K PTE format is different from 64K PTE format. Saving the hash_slot is just + * a matter of returning the PTE bits that need to be modified. On 64K PTE, + * things are a little more involved and hence needs many more parameters to + * accomplish the same. However we want to abstract this out from the caller by + * keeping the prototype consistent across the two formats. + */ +static inline unsigned long pte_set_hidx(pte_t *ptep, real_pte_t rpte, + unsigned int subpg_index, unsigned long hidx, + int offset) +{ + return (hidx << H_PAGE_F_GIX_SHIFT) & + (H_PAGE_F_SECOND | H_PAGE_F_GIX); +} + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + +static inline char *get_hpte_slot_array(pmd_t *pmdp) +{ + BUG(); + return NULL; +} + +static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index) +{ + BUG(); + return 0; +} + +static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array, + int index) +{ + BUG(); + return 0; +} + +static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array, + unsigned int index, unsigned int hidx) +{ + BUG(); +} + +static inline int hash__pmd_trans_huge(pmd_t pmd) +{ + return 0; +} + +static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b) +{ + BUG(); + return 0; +} + +static inline pmd_t hash__pmd_mkhuge(pmd_t pmd) +{ + BUG(); + return pmd; +} + +extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, + unsigned long addr, pmd_t *pmdp, + unsigned long clr, unsigned long set); +extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp); +extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, + pgtable_t pgtable); +extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); +extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm, + unsigned long addr, pmd_t *pmdp); +extern int hash__has_transparent_hugepage(void); +#endif + +static inline pmd_t hash__pmd_mkdevmap(pmd_t pmd) +{ + BUG(); + return pmd; +} + +#endif /* !__ASSEMBLY__ */ + +#endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */ |