From daba790242dfbdf6ef1bcabf3d6ed4c88cccf59a Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Tue, 9 Oct 2018 13:51:52 +0000 Subject: [PATCH] powerpc/mm: add pte helpers to query and change pte flags In order to avoid using generic _PAGE_XXX flags in powerpc core functions, define helpers for all needed flags: - pte_mkuser() and pte_mkprivileged() to set/unset and/or unset/set _PAGE_USER and/or _PAGE_PRIVILEGED - pte_hashpte() to check if _PAGE_HASHPTE is set. - pte_ci() check if cache is inhibited (already existing on book3s/64) - pte_exprotect() to protect against execution - pte_exec() and pte_mkexec() to query and set page execution - pte_mkpte() to set _PAGE_PTE flag. - pte_hw_valid() to check _PAGE_PRESENT since pte_present does something different on book3s/64. On book3s/32 there is no exec protection, so pte_mkexec() and pte_exprotect() are nops and pte_exec() returns always true. Reviewed-by: Aneesh Kumar K.V Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman --- arch/powerpc/include/asm/book3s/32/pgtable.h | 41 ++++++++++++++++++++ arch/powerpc/include/asm/book3s/64/pgtable.h | 35 +++++++++++++++++ arch/powerpc/include/asm/nohash/32/pgtable.h | 5 +++ arch/powerpc/include/asm/nohash/64/pgtable.h | 5 +++ arch/powerpc/include/asm/nohash/pgtable.h | 28 +++++++++++++ 5 files changed, 114 insertions(+) diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h index 3127cc529aa1..a6ca799e0eb5 100644 --- a/arch/powerpc/include/asm/book3s/32/pgtable.h +++ b/arch/powerpc/include/asm/book3s/32/pgtable.h @@ -301,6 +301,7 @@ static inline int pte_dirty(pte_t pte) { return !!(pte_val(pte) & _PAGE_DIRTY); static inline int pte_young(pte_t pte) { return !!(pte_val(pte) & _PAGE_ACCESSED); } static inline int pte_special(pte_t pte) { return !!(pte_val(pte) & _PAGE_SPECIAL); } static inline int pte_none(pte_t pte) { return (pte_val(pte) & ~_PTE_NONE_MASK) == 0; } +static inline bool pte_exec(pte_t pte) { return true; } static inline pgprot_t pte_pgprot(pte_t pte) { return __pgprot(pte_val(pte) & PAGE_PROT_BITS); } static inline int pte_present(pte_t pte) @@ -308,6 +309,21 @@ static inline int pte_present(pte_t pte) return pte_val(pte) & _PAGE_PRESENT; } +static inline bool pte_hw_valid(pte_t pte) +{ + return pte_val(pte) & _PAGE_PRESENT; +} + +static inline bool pte_hashpte(pte_t pte) +{ + return !!(pte_val(pte) & _PAGE_HASHPTE); +} + +static inline bool pte_ci(pte_t pte) +{ + return !!(pte_val(pte) & _PAGE_NO_CACHE); +} + /* * We only find page table entry in the last level * Hence no need for other accessors @@ -354,6 +370,11 @@ static inline pte_t pte_wrprotect(pte_t pte) return __pte(pte_val(pte) & ~_PAGE_RW); } +static inline pte_t pte_exprotect(pte_t pte) +{ + return pte; +} + static inline pte_t pte_mkclean(pte_t pte) { return __pte(pte_val(pte) & ~_PAGE_DIRTY); @@ -364,6 +385,16 @@ static inline pte_t pte_mkold(pte_t pte) return __pte(pte_val(pte) & ~_PAGE_ACCESSED); } +static inline pte_t pte_mkexec(pte_t pte) +{ + return pte; +} + +static inline pte_t pte_mkpte(pte_t pte) +{ + return pte; +} + static inline pte_t pte_mkwrite(pte_t pte) { return __pte(pte_val(pte) | _PAGE_RW); @@ -389,6 +420,16 @@ static inline pte_t pte_mkhuge(pte_t pte) return pte; } +static inline pte_t pte_mkprivileged(pte_t pte) +{ + return __pte(pte_val(pte) & ~_PAGE_USER); +} + +static inline pte_t pte_mkuser(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_USER); +} + static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index eae6e1030523..28a15c3450ff 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -519,6 +519,11 @@ static inline int pte_special(pte_t pte) return !!(pte_raw(pte) & cpu_to_be64(_PAGE_SPECIAL)); } +static inline bool pte_exec(pte_t pte) +{ + return !!(pte_raw(pte) & cpu_to_be64(_PAGE_EXEC)); +} + static inline pgprot_t pte_pgprot(pte_t pte) { return __pgprot(pte_val(pte) & PAGE_PROT_BITS); } #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY @@ -587,6 +592,11 @@ static inline int pte_present(pte_t pte) return !!(pte_raw(pte) & cpu_to_be64(_PAGE_PRESENT | _PAGE_INVALID)); } +static inline bool pte_hw_valid(pte_t pte) +{ + return !!(pte_raw(pte) & cpu_to_be64(_PAGE_PRESENT)); +} + #ifdef CONFIG_PPC_MEM_KEYS extern bool arch_pte_access_permitted(u64 pte, bool write, bool execute); #else @@ -646,6 +656,11 @@ static inline pte_t pte_wrprotect(pte_t pte) return __pte(pte_val(pte) & ~_PAGE_WRITE); } +static inline pte_t pte_exprotect(pte_t pte) +{ + return __pte(pte_val(pte) & ~_PAGE_EXEC); +} + static inline pte_t pte_mkclean(pte_t pte) { return __pte(pte_val(pte) & ~_PAGE_DIRTY); @@ -656,6 +671,16 @@ static inline pte_t pte_mkold(pte_t pte) return __pte(pte_val(pte) & ~_PAGE_ACCESSED); } +static inline pte_t pte_mkexec(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_EXEC); +} + +static inline pte_t pte_mkpte(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_PTE); +} + static inline pte_t pte_mkwrite(pte_t pte) { /* @@ -689,6 +714,16 @@ static inline pte_t pte_mkdevmap(pte_t pte) return __pte(pte_val(pte) | _PAGE_SPECIAL|_PAGE_DEVMAP); } +static inline pte_t pte_mkprivileged(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_PRIVILEGED); +} + +static inline pte_t pte_mkuser(pte_t pte) +{ + return __pte(pte_val(pte) & ~_PAGE_PRIVILEGED); +} + /* * This is potentially called with a pmd as the argument, in which case it's not * safe to check _PAGE_DEVMAP unless we also confirm that _PAGE_PTE is set. diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h index 4373f8c44b6d..6fecfd7854f5 100644 --- a/arch/powerpc/include/asm/nohash/32/pgtable.h +++ b/arch/powerpc/include/asm/nohash/32/pgtable.h @@ -164,6 +164,11 @@ static inline pte_t pte_wrprotect(pte_t pte) return __pte(ptev); } +static inline pte_t pte_mkexec(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_EXEC); +} + #define pmd_none(pmd) (!pmd_val(pmd)) #define pmd_bad(pmd) (pmd_val(pmd) & _PMD_BAD) #define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT_MASK) diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h index 72dac522aa66..b7d65d4b61be 100644 --- a/arch/powerpc/include/asm/nohash/64/pgtable.h +++ b/arch/powerpc/include/asm/nohash/64/pgtable.h @@ -114,6 +114,11 @@ static inline pte_t pte_wrprotect(pte_t pte) return __pte(pte_val(pte) & ~_PAGE_RW); } +static inline pte_t pte_mkexec(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_EXEC); +} + #define PMD_BAD_BITS (PTE_TABLE_SIZE-1) #define PUD_BAD_BITS (PMD_TABLE_SIZE-1) diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h index c746e9e784cd..b256e38a047c 100644 --- a/arch/powerpc/include/asm/nohash/pgtable.h +++ b/arch/powerpc/include/asm/nohash/pgtable.h @@ -19,6 +19,9 @@ static inline int pte_read(pte_t pte) { return 1; } static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } static inline int pte_none(pte_t pte) { return (pte_val(pte) & ~_PTE_NONE_MASK) == 0; } +static inline bool pte_hashpte(pte_t pte) { return false; } +static inline bool pte_ci(pte_t pte) { return pte_val(pte) & _PAGE_NO_CACHE; } +static inline bool pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXEC; } static inline pgprot_t pte_pgprot(pte_t pte) { return __pgprot(pte_val(pte) & PAGE_PROT_BITS); } #ifdef CONFIG_NUMA_BALANCING @@ -44,6 +47,11 @@ static inline int pte_present(pte_t pte) return pte_val(pte) & _PAGE_PRESENT; } +static inline bool pte_hw_valid(pte_t pte) +{ + return pte_val(pte) & _PAGE_PRESENT; +} + /* * We only find page table entry in the last level * Hence no need for other accessors @@ -77,6 +85,11 @@ static inline unsigned long pte_pfn(pte_t pte) { return pte_val(pte) >> PTE_RPN_SHIFT; } /* Generic modifiers for PTE bits */ +static inline pte_t pte_exprotect(pte_t pte) +{ + return __pte(pte_val(pte) & ~_PAGE_EXEC); +} + static inline pte_t pte_mkclean(pte_t pte) { return __pte(pte_val(pte) & ~(_PAGE_DIRTY | _PAGE_HWWRITE)); @@ -87,6 +100,11 @@ static inline pte_t pte_mkold(pte_t pte) return __pte(pte_val(pte) & ~_PAGE_ACCESSED); } +static inline pte_t pte_mkpte(pte_t pte) +{ + return pte; +} + static inline pte_t pte_mkspecial(pte_t pte) { return __pte(pte_val(pte) | _PAGE_SPECIAL); @@ -97,6 +115,16 @@ static inline pte_t pte_mkhuge(pte_t pte) return __pte(pte_val(pte) | _PAGE_HUGE); } +static inline pte_t pte_mkprivileged(pte_t pte) +{ + return __pte((pte_val(pte) & ~_PAGE_USER) | _PAGE_PRIVILEGED); +} + +static inline pte_t pte_mkuser(pte_t pte) +{ + return __pte((pte_val(pte) & ~_PAGE_PRIVILEGED) | _PAGE_USER); +} + static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); -- 2.30.2