From: Aneesh Kumar K.V Date: Fri, 29 Apr 2016 13:25:52 +0000 (+1000) Subject: powerpc/mm/radix: Add radix pte #defines X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b0b5e9b1304765d079c71373df236733765f42ac;p=linux-beck.git powerpc/mm/radix: Add radix pte #defines This adds Power ISA 3.0 specific pte defines. We share most of the details with hash Linux page table format. This patch indicates only things where we differ. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman --- diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 2643487affac..c47c3f7fc4e0 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -205,6 +205,7 @@ extern unsigned long __pgd_table_size; #endif /* __ASSEMBLY__ */ #include +#include #include /* diff --git a/arch/powerpc/include/asm/book3s/64/radix-4k.h b/arch/powerpc/include/asm/book3s/64/radix-4k.h new file mode 100644 index 000000000000..7c3b1fe1619e --- /dev/null +++ b/arch/powerpc/include/asm/book3s/64/radix-4k.h @@ -0,0 +1,12 @@ +#ifndef _ASM_POWERPC_PGTABLE_RADIX_4K_H +#define _ASM_POWERPC_PGTABLE_RADIX_4K_H + +/* + * For 4K page size supported index is 13/9/9/9 + */ +#define RADIX_PTE_INDEX_SIZE 9 /* 2MB huge page */ +#define RADIX_PMD_INDEX_SIZE 9 /* 1G huge page */ +#define RADIX_PUD_INDEX_SIZE 9 +#define RADIX_PGD_INDEX_SIZE 13 + +#endif /* _ASM_POWERPC_PGTABLE_RADIX_4K_H */ diff --git a/arch/powerpc/include/asm/book3s/64/radix-64k.h b/arch/powerpc/include/asm/book3s/64/radix-64k.h new file mode 100644 index 000000000000..82dc355f0b45 --- /dev/null +++ b/arch/powerpc/include/asm/book3s/64/radix-64k.h @@ -0,0 +1,12 @@ +#ifndef _ASM_POWERPC_PGTABLE_RADIX_64K_H +#define _ASM_POWERPC_PGTABLE_RADIX_64K_H + +/* + * For 64K page size supported index is 13/9/9/5 + */ +#define RADIX_PTE_INDEX_SIZE 5 /* 2MB huge page */ +#define RADIX_PMD_INDEX_SIZE 9 /* 1G huge page */ +#define RADIX_PUD_INDEX_SIZE 9 +#define RADIX_PGD_INDEX_SIZE 13 + +#endif /* _ASM_POWERPC_PGTABLE_RADIX_64K_H */ diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h new file mode 100644 index 000000000000..4b581a0ebc0a --- /dev/null +++ b/arch/powerpc/include/asm/book3s/64/radix.h @@ -0,0 +1,125 @@ +#ifndef _ASM_POWERPC_PGTABLE_RADIX_H +#define _ASM_POWERPC_PGTABLE_RADIX_H + +#ifndef __ASSEMBLY__ +#include +#endif + +#ifdef CONFIG_PPC_64K_PAGES +#include +#else +#include +#endif + +/* An empty PTE can still have a R or C writeback */ +#define RADIX_PTE_NONE_MASK (_PAGE_DIRTY | _PAGE_ACCESSED) + +/* Bits to set in a RPMD/RPUD/RPGD */ +#define RADIX_PMD_VAL_BITS (0x8000000000000000UL | RADIX_PTE_INDEX_SIZE) +#define RADIX_PUD_VAL_BITS (0x8000000000000000UL | RADIX_PMD_INDEX_SIZE) +#define RADIX_PGD_VAL_BITS (0x8000000000000000UL | RADIX_PUD_INDEX_SIZE) + +/* Don't have anything in the reserved bits and leaf bits */ +#define RADIX_PMD_BAD_BITS 0x60000000000000e0UL +#define RADIX_PUD_BAD_BITS 0x60000000000000e0UL +#define RADIX_PGD_BAD_BITS 0x60000000000000e0UL + +/* + * Size of EA range mapped by our pagetables. + */ +#define RADIX_PGTABLE_EADDR_SIZE (RADIX_PTE_INDEX_SIZE + RADIX_PMD_INDEX_SIZE + \ + RADIX_PUD_INDEX_SIZE + RADIX_PGD_INDEX_SIZE + PAGE_SHIFT) +#define RADIX_PGTABLE_RANGE (ASM_CONST(1) << RADIX_PGTABLE_EADDR_SIZE) + +#ifndef __ASSEMBLY__ +#define RADIX_PTE_TABLE_SIZE (sizeof(pte_t) << RADIX_PTE_INDEX_SIZE) +#define RADIX_PMD_TABLE_SIZE (sizeof(pmd_t) << RADIX_PMD_INDEX_SIZE) +#define RADIX_PUD_TABLE_SIZE (sizeof(pud_t) << RADIX_PUD_INDEX_SIZE) +#define RADIX_PGD_TABLE_SIZE (sizeof(pgd_t) << RADIX_PGD_INDEX_SIZE) + +static inline unsigned long radix__pte_update(struct mm_struct *mm, + unsigned long addr, + pte_t *ptep, unsigned long clr, + unsigned long set, + int huge) +{ + pte_t pte; + unsigned long old_pte, new_pte; + + do { + pte = READ_ONCE(*ptep); + old_pte = pte_val(pte); + new_pte = (old_pte | set) & ~clr; + + } while (!pte_xchg(ptep, __pte(old_pte), __pte(new_pte))); + + /* We already do a sync in cmpxchg, is ptesync needed ?*/ + asm volatile("ptesync" : : : "memory"); + /* huge pages use the old page table lock */ + if (!huge) + assert_pte_locked(mm, addr); + + return old_pte; +} + +/* + * Set the dirty and/or accessed bits atomically in a linux PTE, this + * function doesn't need to invalidate tlb. + */ +static inline void radix__ptep_set_access_flags(pte_t *ptep, pte_t entry) +{ + pte_t pte; + unsigned long old_pte, new_pte; + unsigned long set = pte_val(entry) & (_PAGE_DIRTY | _PAGE_ACCESSED | + _PAGE_RW | _PAGE_EXEC); + do { + pte = READ_ONCE(*ptep); + old_pte = pte_val(pte); + new_pte = old_pte | set; + + } while (!pte_xchg(ptep, __pte(old_pte), __pte(new_pte))); + + /* We already do a sync in cmpxchg, is ptesync needed ?*/ + asm volatile("ptesync" : : : "memory"); +} + +static inline int radix__pte_same(pte_t pte_a, pte_t pte_b) +{ + return ((pte_raw(pte_a) ^ pte_raw(pte_b)) == 0); +} + +static inline int radix__pte_none(pte_t pte) +{ + return (pte_val(pte) & ~RADIX_PTE_NONE_MASK) == 0; +} + +static inline void radix__set_pte_at(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t pte, int percpu) +{ + *ptep = pte; + asm volatile("ptesync" : : : "memory"); +} + +static inline int radix__pmd_bad(pmd_t pmd) +{ + return !!(pmd_val(pmd) & RADIX_PMD_BAD_BITS); +} + +static inline int radix__pmd_same(pmd_t pmd_a, pmd_t pmd_b) +{ + return ((pmd_raw(pmd_a) ^ pmd_raw(pmd_b)) == 0); +} + +static inline int radix__pud_bad(pud_t pud) +{ + return !!(pud_val(pud) & RADIX_PUD_BAD_BITS); +} + + +static inline int radix__pgd_bad(pgd_t pgd) +{ + return !!(pgd_val(pgd) & RADIX_PGD_BAD_BITS); +} + +#endif /* __ASSEMBLY__ */ +#endif