1449 lines
41 KiB
C
1449 lines
41 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_BOOK3S_64_PGTABLE_H_
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#define _ASM_POWERPC_BOOK3S_64_PGTABLE_H_
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#include <asm-generic/pgtable-nop4d.h>
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#ifndef __ASSEMBLY__
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#include <linux/mmdebug.h>
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#include <linux/bug.h>
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#include <linux/sizes.h>
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#endif
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/*
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* Common bits between hash and Radix page table
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*/
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#define _PAGE_BIT_SWAP_TYPE 0
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#define _PAGE_EXEC 0x00001 /* execute permission */
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#define _PAGE_WRITE 0x00002 /* write access allowed */
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#define _PAGE_READ 0x00004 /* read access allowed */
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#define _PAGE_RW (_PAGE_READ | _PAGE_WRITE)
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#define _PAGE_RWX (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
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#define _PAGE_PRIVILEGED 0x00008 /* kernel access only */
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#define _PAGE_SAO 0x00010 /* Strong access order */
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#define _PAGE_NON_IDEMPOTENT 0x00020 /* non idempotent memory */
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#define _PAGE_TOLERANT 0x00030 /* tolerant memory, cache inhibited */
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#define _PAGE_DIRTY 0x00080 /* C: page changed */
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#define _PAGE_ACCESSED 0x00100 /* R: page referenced */
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/*
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* Software bits
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*/
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#define _RPAGE_SW0 0x2000000000000000UL
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#define _RPAGE_SW1 0x00800
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#define _RPAGE_SW2 0x00400
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#define _RPAGE_SW3 0x00200
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#define _RPAGE_RSV1 0x00040UL
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#define _RPAGE_PKEY_BIT4 0x1000000000000000UL
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#define _RPAGE_PKEY_BIT3 0x0800000000000000UL
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#define _RPAGE_PKEY_BIT2 0x0400000000000000UL
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#define _RPAGE_PKEY_BIT1 0x0200000000000000UL
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#define _RPAGE_PKEY_BIT0 0x0100000000000000UL
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#define _PAGE_PTE 0x4000000000000000UL /* distinguishes PTEs from pointers */
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#define _PAGE_PRESENT 0x8000000000000000UL /* pte contains a translation */
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/*
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* We need to mark a pmd pte invalid while splitting. We can do that by clearing
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* the _PAGE_PRESENT bit. But then that will be taken as a swap pte. In order to
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* differentiate between two use a SW field when invalidating.
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*
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* We do that temporary invalidate for regular pte entry in ptep_set_access_flags
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*
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* This is used only when _PAGE_PRESENT is cleared.
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*/
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#define _PAGE_INVALID _RPAGE_SW0
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/*
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* Top and bottom bits of RPN which can be used by hash
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* translation mode, because we expect them to be zero
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* otherwise.
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*/
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#define _RPAGE_RPN0 0x01000
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#define _RPAGE_RPN1 0x02000
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#define _RPAGE_RPN43 0x0080000000000000UL
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#define _RPAGE_RPN42 0x0040000000000000UL
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#define _RPAGE_RPN41 0x0020000000000000UL
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/* Max physical address bit as per radix table */
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#define _RPAGE_PA_MAX 56
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/*
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* Max physical address bit we will use for now.
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*
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* This is mostly a hardware limitation and for now Power9 has
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* a 51 bit limit.
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*
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* This is different from the number of physical bit required to address
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* the last byte of memory. That is defined by MAX_PHYSMEM_BITS.
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* MAX_PHYSMEM_BITS is a linux limitation imposed by the maximum
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* number of sections we can support (SECTIONS_SHIFT).
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*
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* This is different from Radix page table limitation above and
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* should always be less than that. The limit is done such that
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* we can overload the bits between _RPAGE_PA_MAX and _PAGE_PA_MAX
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* for hash linux page table specific bits.
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*
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* In order to be compatible with future hardware generations we keep
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* some offsets and limit this for now to 53
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*/
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#define _PAGE_PA_MAX 53
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#define _PAGE_SOFT_DIRTY _RPAGE_SW3 /* software: software dirty tracking */
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#define _PAGE_SPECIAL _RPAGE_SW2 /* software: special page */
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#define _PAGE_DEVMAP _RPAGE_SW1 /* software: ZONE_DEVICE page */
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/*
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* Drivers request for cache inhibited pte mapping using _PAGE_NO_CACHE
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* Instead of fixing all of them, add an alternate define which
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* maps CI pte mapping.
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*/
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#define _PAGE_NO_CACHE _PAGE_TOLERANT
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/*
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* We support _RPAGE_PA_MAX bit real address in pte. On the linux side
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* we are limited by _PAGE_PA_MAX. Clear everything above _PAGE_PA_MAX
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* and every thing below PAGE_SHIFT;
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*/
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#define PTE_RPN_MASK (((1UL << _PAGE_PA_MAX) - 1) & (PAGE_MASK))
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/*
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* set of bits not changed in pmd_modify. Even though we have hash specific bits
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* in here, on radix we expect them to be zero.
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*/
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#define _HPAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
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_PAGE_ACCESSED | H_PAGE_THP_HUGE | _PAGE_PTE | \
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_PAGE_SOFT_DIRTY | _PAGE_DEVMAP)
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/*
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* user access blocked by key
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*/
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#define _PAGE_KERNEL_RW (_PAGE_PRIVILEGED | _PAGE_RW | _PAGE_DIRTY)
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#define _PAGE_KERNEL_RO (_PAGE_PRIVILEGED | _PAGE_READ)
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#define _PAGE_KERNEL_ROX (_PAGE_PRIVILEGED | _PAGE_READ | _PAGE_EXEC)
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#define _PAGE_KERNEL_RWX (_PAGE_PRIVILEGED | _PAGE_DIRTY | \
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_PAGE_RW | _PAGE_EXEC)
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/*
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* _PAGE_CHG_MASK masks of bits that are to be preserved across
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* pgprot changes
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*/
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#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
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_PAGE_ACCESSED | _PAGE_SPECIAL | _PAGE_PTE | \
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_PAGE_SOFT_DIRTY | _PAGE_DEVMAP)
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/*
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* We define 2 sets of base prot bits, one for basic pages (ie,
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* cacheable kernel and user pages) and one for non cacheable
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* pages. We always set _PAGE_COHERENT when SMP is enabled or
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* the processor might need it for DMA coherency.
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*/
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#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED)
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#define _PAGE_BASE (_PAGE_BASE_NC)
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/* Permission masks used to generate the __P and __S table,
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*
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* Note:__pgprot is defined in arch/powerpc/include/asm/page.h
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*
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* Write permissions imply read permissions for now (we could make write-only
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* pages on BookE but we don't bother for now). Execute permission control is
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* possible on platforms that define _PAGE_EXEC
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*/
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#define PAGE_NONE __pgprot(_PAGE_BASE | _PAGE_PRIVILEGED)
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#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_RW)
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#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_EXEC)
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#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_READ)
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#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_EXEC)
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#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_READ)
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#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_EXEC)
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/* Permission masks used for kernel mappings */
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#define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
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#define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
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_PAGE_TOLERANT)
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#define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
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_PAGE_NON_IDEMPOTENT)
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#define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)
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#define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
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#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)
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/*
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* Protection used for kernel text. We want the debuggers to be able to
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* set breakpoints anywhere, so don't write protect the kernel text
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* on platforms where such control is possible.
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*/
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#if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) || \
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defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
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#define PAGE_KERNEL_TEXT PAGE_KERNEL_X
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#else
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#define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX
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#endif
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/* Make modules code happy. We don't set RO yet */
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#define PAGE_KERNEL_EXEC PAGE_KERNEL_X
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#define PAGE_AGP (PAGE_KERNEL_NC)
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#ifndef __ASSEMBLY__
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/*
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* page table defines
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*/
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extern unsigned long __pte_index_size;
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extern unsigned long __pmd_index_size;
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extern unsigned long __pud_index_size;
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extern unsigned long __pgd_index_size;
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extern unsigned long __pud_cache_index;
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#define PTE_INDEX_SIZE __pte_index_size
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#define PMD_INDEX_SIZE __pmd_index_size
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#define PUD_INDEX_SIZE __pud_index_size
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#define PGD_INDEX_SIZE __pgd_index_size
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/* pmd table use page table fragments */
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#define PMD_CACHE_INDEX 0
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#define PUD_CACHE_INDEX __pud_cache_index
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/*
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* Because of use of pte fragments and THP, size of page table
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* are not always derived out of index size above.
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*/
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extern unsigned long __pte_table_size;
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extern unsigned long __pmd_table_size;
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extern unsigned long __pud_table_size;
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extern unsigned long __pgd_table_size;
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#define PTE_TABLE_SIZE __pte_table_size
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#define PMD_TABLE_SIZE __pmd_table_size
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#define PUD_TABLE_SIZE __pud_table_size
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#define PGD_TABLE_SIZE __pgd_table_size
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extern unsigned long __pmd_val_bits;
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extern unsigned long __pud_val_bits;
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extern unsigned long __pgd_val_bits;
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#define PMD_VAL_BITS __pmd_val_bits
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#define PUD_VAL_BITS __pud_val_bits
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#define PGD_VAL_BITS __pgd_val_bits
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extern unsigned long __pte_frag_nr;
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#define PTE_FRAG_NR __pte_frag_nr
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extern unsigned long __pte_frag_size_shift;
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#define PTE_FRAG_SIZE_SHIFT __pte_frag_size_shift
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#define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT)
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extern unsigned long __pmd_frag_nr;
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#define PMD_FRAG_NR __pmd_frag_nr
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extern unsigned long __pmd_frag_size_shift;
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#define PMD_FRAG_SIZE_SHIFT __pmd_frag_size_shift
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#define PMD_FRAG_SIZE (1UL << PMD_FRAG_SIZE_SHIFT)
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#define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
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#define PTRS_PER_PMD (1 << PMD_INDEX_SIZE)
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#define PTRS_PER_PUD (1 << PUD_INDEX_SIZE)
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#define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
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#define MAX_PTRS_PER_PGD (1 << (H_PGD_INDEX_SIZE > RADIX_PGD_INDEX_SIZE ? \
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H_PGD_INDEX_SIZE : RADIX_PGD_INDEX_SIZE))
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/* PMD_SHIFT determines what a second-level page table entry can map */
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#define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE)
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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/* PUD_SHIFT determines what a third-level page table entry can map */
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#define PUD_SHIFT (PMD_SHIFT + PMD_INDEX_SIZE)
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#define PUD_SIZE (1UL << PUD_SHIFT)
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#define PUD_MASK (~(PUD_SIZE-1))
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/* PGDIR_SHIFT determines what a fourth-level page table entry can map */
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#define PGDIR_SHIFT (PUD_SHIFT + PUD_INDEX_SIZE)
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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/* Bits to mask out from a PMD to get to the PTE page */
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#define PMD_MASKED_BITS 0xc0000000000000ffUL
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/* Bits to mask out from a PUD to get to the PMD page */
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#define PUD_MASKED_BITS 0xc0000000000000ffUL
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/* Bits to mask out from a PGD to get to the PUD page */
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#define P4D_MASKED_BITS 0xc0000000000000ffUL
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/*
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* Used as an indicator for rcu callback functions
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*/
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enum pgtable_index {
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PTE_INDEX = 0,
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PMD_INDEX,
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PUD_INDEX,
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PGD_INDEX,
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/*
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* Below are used with 4k page size and hugetlb
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*/
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HTLB_16M_INDEX,
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HTLB_16G_INDEX,
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};
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extern unsigned long __vmalloc_start;
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extern unsigned long __vmalloc_end;
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#define VMALLOC_START __vmalloc_start
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#define VMALLOC_END __vmalloc_end
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static inline unsigned int ioremap_max_order(void)
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{
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if (radix_enabled())
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return PUD_SHIFT;
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return 7 + PAGE_SHIFT; /* default from linux/vmalloc.h */
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}
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#define IOREMAP_MAX_ORDER ioremap_max_order()
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extern unsigned long __kernel_virt_start;
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extern unsigned long __kernel_io_start;
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extern unsigned long __kernel_io_end;
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#define KERN_VIRT_START __kernel_virt_start
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#define KERN_IO_START __kernel_io_start
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#define KERN_IO_END __kernel_io_end
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extern struct page *vmemmap;
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extern unsigned long pci_io_base;
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#endif /* __ASSEMBLY__ */
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#include <asm/book3s/64/hash.h>
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#include <asm/book3s/64/radix.h>
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#if H_MAX_PHYSMEM_BITS > R_MAX_PHYSMEM_BITS
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#define MAX_PHYSMEM_BITS H_MAX_PHYSMEM_BITS
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#else
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#define MAX_PHYSMEM_BITS R_MAX_PHYSMEM_BITS
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#endif
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#ifdef CONFIG_PPC_64K_PAGES
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#include <asm/book3s/64/pgtable-64k.h>
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#else
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#include <asm/book3s/64/pgtable-4k.h>
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#endif
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#include <asm/barrier.h>
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/*
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* IO space itself carved into the PIO region (ISA and PHB IO space) and
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* the ioremap space
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*
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* ISA_IO_BASE = KERN_IO_START, 64K reserved area
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* PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
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* IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
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*/
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#define FULL_IO_SIZE 0x80000000ul
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#define ISA_IO_BASE (KERN_IO_START)
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#define ISA_IO_END (KERN_IO_START + 0x10000ul)
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#define PHB_IO_BASE (ISA_IO_END)
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#define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE)
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#define IOREMAP_BASE (PHB_IO_END)
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#define IOREMAP_START (ioremap_bot)
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#define IOREMAP_END (KERN_IO_END - FIXADDR_SIZE)
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#define FIXADDR_SIZE SZ_32M
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/* Advertise special mapping type for AGP */
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#define HAVE_PAGE_AGP
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#ifndef __ASSEMBLY__
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/*
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* This is the default implementation of various PTE accessors, it's
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* used in all cases except Book3S with 64K pages where we have a
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* concept of sub-pages
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*/
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#ifndef __real_pte
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#define __real_pte(e, p, o) ((real_pte_t){(e)})
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#define __rpte_to_pte(r) ((r).pte)
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#define __rpte_to_hidx(r,index) (pte_val(__rpte_to_pte(r)) >> H_PAGE_F_GIX_SHIFT)
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#define pte_iterate_hashed_subpages(rpte, psize, va, index, shift) \
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do { \
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index = 0; \
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shift = mmu_psize_defs[psize].shift; \
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#define pte_iterate_hashed_end() } while(0)
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/*
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* We expect this to be called only for user addresses or kernel virtual
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* addresses other than the linear mapping.
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*/
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#define pte_pagesize_index(mm, addr, pte) MMU_PAGE_4K
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#endif /* __real_pte */
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static inline unsigned long pte_update(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, unsigned long clr,
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unsigned long set, int huge)
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{
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if (radix_enabled())
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return radix__pte_update(mm, addr, ptep, clr, set, huge);
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return hash__pte_update(mm, addr, ptep, clr, set, huge);
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}
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/*
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* For hash even if we have _PAGE_ACCESSED = 0, we do a pte_update.
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* We currently remove entries from the hashtable regardless of whether
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* the entry was young or dirty.
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*
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* We should be more intelligent about this but for the moment we override
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* these functions and force a tlb flush unconditionally
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* For radix: H_PAGE_HASHPTE should be zero. Hence we can use the same
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* function for both hash and radix.
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*/
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static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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unsigned long old;
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if ((pte_raw(*ptep) & cpu_to_be64(_PAGE_ACCESSED | H_PAGE_HASHPTE)) == 0)
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return 0;
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old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
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return (old & _PAGE_ACCESSED) != 0;
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}
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#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
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#define ptep_test_and_clear_young(__vma, __addr, __ptep) \
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({ \
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__ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
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})
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/*
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* On Book3S CPUs, clearing the accessed bit without a TLB flush
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* doesn't cause data corruption. [ It could cause incorrect
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* page aging and the (mistaken) reclaim of hot pages, but the
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* chance of that should be relatively low. ]
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*
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* So as a performance optimization don't flush the TLB when
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* clearing the accessed bit, it will eventually be flushed by
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* a context switch or a VM operation anyway. [ In the rare
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* event of it not getting flushed for a long time the delay
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* shouldn't really matter because there's no real memory
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* pressure for swapout to react to. ]
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*/
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#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
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#define ptep_clear_flush_young ptep_test_and_clear_young
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#define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
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#define pmdp_clear_flush_young pmdp_test_and_clear_young
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static inline int __pte_write(pte_t pte)
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{
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return !!(pte_raw(pte) & cpu_to_be64(_PAGE_WRITE));
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}
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#ifdef CONFIG_NUMA_BALANCING
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#define pte_savedwrite pte_savedwrite
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static inline bool pte_savedwrite(pte_t pte)
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{
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/*
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* Saved write ptes are prot none ptes that doesn't have
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* privileged bit sit. We mark prot none as one which has
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* present and pviliged bit set and RWX cleared. To mark
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* protnone which used to have _PAGE_WRITE set we clear
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* the privileged bit.
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*/
|
|
return !(pte_raw(pte) & cpu_to_be64(_PAGE_RWX | _PAGE_PRIVILEGED));
|
|
}
|
|
#else
|
|
#define pte_savedwrite pte_savedwrite
|
|
static inline bool pte_savedwrite(pte_t pte)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
static inline int pte_write(pte_t pte)
|
|
{
|
|
return __pte_write(pte) || pte_savedwrite(pte);
|
|
}
|
|
|
|
static inline int pte_read(pte_t pte)
|
|
{
|
|
return !!(pte_raw(pte) & cpu_to_be64(_PAGE_READ));
|
|
}
|
|
|
|
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
|
|
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep)
|
|
{
|
|
if (__pte_write(*ptep))
|
|
pte_update(mm, addr, ptep, _PAGE_WRITE, 0, 0);
|
|
else if (unlikely(pte_savedwrite(*ptep)))
|
|
pte_update(mm, addr, ptep, 0, _PAGE_PRIVILEGED, 0);
|
|
}
|
|
|
|
#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
|
|
static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
|
|
unsigned long addr, pte_t *ptep)
|
|
{
|
|
/*
|
|
* We should not find protnone for hugetlb, but this complete the
|
|
* interface.
|
|
*/
|
|
if (__pte_write(*ptep))
|
|
pte_update(mm, addr, ptep, _PAGE_WRITE, 0, 1);
|
|
else if (unlikely(pte_savedwrite(*ptep)))
|
|
pte_update(mm, addr, ptep, 0, _PAGE_PRIVILEGED, 1);
|
|
}
|
|
|
|
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
|
|
static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
|
|
unsigned long addr, pte_t *ptep)
|
|
{
|
|
unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
|
|
return __pte(old);
|
|
}
|
|
|
|
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
|
|
static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
|
|
unsigned long addr,
|
|
pte_t *ptep, int full)
|
|
{
|
|
if (full && radix_enabled()) {
|
|
/*
|
|
* We know that this is a full mm pte clear and
|
|
* hence can be sure there is no parallel set_pte.
|
|
*/
|
|
return radix__ptep_get_and_clear_full(mm, addr, ptep, full);
|
|
}
|
|
return ptep_get_and_clear(mm, addr, ptep);
|
|
}
|
|
|
|
|
|
static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
|
|
pte_t * ptep)
|
|
{
|
|
pte_update(mm, addr, ptep, ~0UL, 0, 0);
|
|
}
|
|
|
|
static inline int pte_dirty(pte_t pte)
|
|
{
|
|
return !!(pte_raw(pte) & cpu_to_be64(_PAGE_DIRTY));
|
|
}
|
|
|
|
static inline int pte_young(pte_t pte)
|
|
{
|
|
return !!(pte_raw(pte) & cpu_to_be64(_PAGE_ACCESSED));
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
|
|
static inline bool pte_soft_dirty(pte_t pte)
|
|
{
|
|
return !!(pte_raw(pte) & cpu_to_be64(_PAGE_SOFT_DIRTY));
|
|
}
|
|
|
|
static inline pte_t pte_mksoft_dirty(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SOFT_DIRTY));
|
|
}
|
|
|
|
static inline pte_t pte_clear_soft_dirty(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_SOFT_DIRTY));
|
|
}
|
|
#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
|
|
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
static inline int pte_protnone(pte_t pte)
|
|
{
|
|
return (pte_raw(pte) & cpu_to_be64(_PAGE_PRESENT | _PAGE_PTE | _PAGE_RWX)) ==
|
|
cpu_to_be64(_PAGE_PRESENT | _PAGE_PTE);
|
|
}
|
|
|
|
#define pte_mk_savedwrite pte_mk_savedwrite
|
|
static inline pte_t pte_mk_savedwrite(pte_t pte)
|
|
{
|
|
/*
|
|
* Used by Autonuma subsystem to preserve the write bit
|
|
* while marking the pte PROT_NONE. Only allow this
|
|
* on PROT_NONE pte
|
|
*/
|
|
VM_BUG_ON((pte_raw(pte) & cpu_to_be64(_PAGE_PRESENT | _PAGE_RWX | _PAGE_PRIVILEGED)) !=
|
|
cpu_to_be64(_PAGE_PRESENT | _PAGE_PRIVILEGED));
|
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_PRIVILEGED));
|
|
}
|
|
|
|
#define pte_clear_savedwrite pte_clear_savedwrite
|
|
static inline pte_t pte_clear_savedwrite(pte_t pte)
|
|
{
|
|
/*
|
|
* Used by KSM subsystem to make a protnone pte readonly.
|
|
*/
|
|
VM_BUG_ON(!pte_protnone(pte));
|
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_PRIVILEGED));
|
|
}
|
|
#else
|
|
#define pte_clear_savedwrite pte_clear_savedwrite
|
|
static inline pte_t pte_clear_savedwrite(pte_t pte)
|
|
{
|
|
VM_WARN_ON(1);
|
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_WRITE));
|
|
}
|
|
#endif /* CONFIG_NUMA_BALANCING */
|
|
|
|
static inline bool pte_hw_valid(pte_t pte)
|
|
{
|
|
return (pte_raw(pte) & cpu_to_be64(_PAGE_PRESENT | _PAGE_PTE)) ==
|
|
cpu_to_be64(_PAGE_PRESENT | _PAGE_PTE);
|
|
}
|
|
|
|
static inline int pte_present(pte_t pte)
|
|
{
|
|
/*
|
|
* A pte is considerent present if _PAGE_PRESENT is set.
|
|
* We also need to consider the pte present which is marked
|
|
* invalid during ptep_set_access_flags. Hence we look for _PAGE_INVALID
|
|
* if we find _PAGE_PRESENT cleared.
|
|
*/
|
|
|
|
if (pte_hw_valid(pte))
|
|
return true;
|
|
return (pte_raw(pte) & cpu_to_be64(_PAGE_INVALID | _PAGE_PTE)) ==
|
|
cpu_to_be64(_PAGE_INVALID | _PAGE_PTE);
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_MEM_KEYS
|
|
extern bool arch_pte_access_permitted(u64 pte, bool write, bool execute);
|
|
#else
|
|
static inline bool arch_pte_access_permitted(u64 pte, bool write, bool execute)
|
|
{
|
|
return true;
|
|
}
|
|
#endif /* CONFIG_PPC_MEM_KEYS */
|
|
|
|
static inline bool pte_user(pte_t pte)
|
|
{
|
|
return !(pte_raw(pte) & cpu_to_be64(_PAGE_PRIVILEGED));
|
|
}
|
|
|
|
#define pte_access_permitted pte_access_permitted
|
|
static inline bool pte_access_permitted(pte_t pte, bool write)
|
|
{
|
|
/*
|
|
* _PAGE_READ is needed for any access and will be
|
|
* cleared for PROT_NONE
|
|
*/
|
|
if (!pte_present(pte) || !pte_user(pte) || !pte_read(pte))
|
|
return false;
|
|
|
|
if (write && !pte_write(pte))
|
|
return false;
|
|
|
|
return arch_pte_access_permitted(pte_val(pte), write, 0);
|
|
}
|
|
|
|
/*
|
|
* Conversion functions: convert a page and protection to a page entry,
|
|
* and a page entry and page directory to the page they refer to.
|
|
*
|
|
* Even if PTEs can be unsigned long long, a PFN is always an unsigned
|
|
* long for now.
|
|
*/
|
|
static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
|
|
{
|
|
VM_BUG_ON(pfn >> (64 - PAGE_SHIFT));
|
|
VM_BUG_ON((pfn << PAGE_SHIFT) & ~PTE_RPN_MASK);
|
|
|
|
return __pte(((pte_basic_t)pfn << PAGE_SHIFT) | pgprot_val(pgprot) | _PAGE_PTE);
|
|
}
|
|
|
|
static inline unsigned long pte_pfn(pte_t pte)
|
|
{
|
|
return (pte_val(pte) & PTE_RPN_MASK) >> PAGE_SHIFT;
|
|
}
|
|
|
|
/* Generic modifiers for PTE bits */
|
|
static inline pte_t pte_wrprotect(pte_t pte)
|
|
{
|
|
if (unlikely(pte_savedwrite(pte)))
|
|
return pte_clear_savedwrite(pte);
|
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_WRITE));
|
|
}
|
|
|
|
static inline pte_t pte_exprotect(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_EXEC));
|
|
}
|
|
|
|
static inline pte_t pte_mkclean(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_DIRTY));
|
|
}
|
|
|
|
static inline pte_t pte_mkold(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_ACCESSED));
|
|
}
|
|
|
|
static inline pte_t pte_mkexec(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_EXEC));
|
|
}
|
|
|
|
static inline pte_t pte_mkwrite(pte_t pte)
|
|
{
|
|
/*
|
|
* write implies read, hence set both
|
|
*/
|
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_RW));
|
|
}
|
|
|
|
static inline pte_t pte_mkdirty(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_DIRTY | _PAGE_SOFT_DIRTY));
|
|
}
|
|
|
|
static inline pte_t pte_mkyoung(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_ACCESSED));
|
|
}
|
|
|
|
static inline pte_t pte_mkspecial(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SPECIAL));
|
|
}
|
|
|
|
static inline pte_t pte_mkhuge(pte_t pte)
|
|
{
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_mkdevmap(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SPECIAL | _PAGE_DEVMAP));
|
|
}
|
|
|
|
static inline pte_t pte_mkprivileged(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_PRIVILEGED));
|
|
}
|
|
|
|
static inline pte_t pte_mkuser(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_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.
|
|
* That's because the bit we use for _PAGE_DEVMAP is not reserved for software
|
|
* use in page directory entries (ie. non-ptes).
|
|
*/
|
|
static inline int pte_devmap(pte_t pte)
|
|
{
|
|
u64 mask = cpu_to_be64(_PAGE_DEVMAP | _PAGE_PTE);
|
|
|
|
return (pte_raw(pte) & mask) == mask;
|
|
}
|
|
|
|
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
|
|
{
|
|
/* FIXME!! check whether this need to be a conditional */
|
|
return __pte_raw((pte_raw(pte) & cpu_to_be64(_PAGE_CHG_MASK)) |
|
|
cpu_to_be64(pgprot_val(newprot)));
|
|
}
|
|
|
|
/* Encode and de-code a swap entry */
|
|
#define MAX_SWAPFILES_CHECK() do { \
|
|
BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
|
|
/* \
|
|
* Don't have overlapping bits with _PAGE_HPTEFLAGS \
|
|
* We filter HPTEFLAGS on set_pte. \
|
|
*/ \
|
|
BUILD_BUG_ON(_PAGE_HPTEFLAGS & (0x1f << _PAGE_BIT_SWAP_TYPE)); \
|
|
BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_SOFT_DIRTY); \
|
|
} while (0)
|
|
|
|
#define SWP_TYPE_BITS 5
|
|
#define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \
|
|
& ((1UL << SWP_TYPE_BITS) - 1))
|
|
#define __swp_offset(x) (((x).val & PTE_RPN_MASK) >> PAGE_SHIFT)
|
|
#define __swp_entry(type, offset) ((swp_entry_t) { \
|
|
((type) << _PAGE_BIT_SWAP_TYPE) \
|
|
| (((offset) << PAGE_SHIFT) & PTE_RPN_MASK)})
|
|
/*
|
|
* swp_entry_t must be independent of pte bits. We build a swp_entry_t from
|
|
* swap type and offset we get from swap and convert that to pte to find a
|
|
* matching pte in linux page table.
|
|
* Clear bits not found in swap entries here.
|
|
*/
|
|
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) & ~_PAGE_PTE })
|
|
#define __swp_entry_to_pte(x) __pte((x).val | _PAGE_PTE)
|
|
#define __pmd_to_swp_entry(pmd) (__pte_to_swp_entry(pmd_pte(pmd)))
|
|
#define __swp_entry_to_pmd(x) (pte_pmd(__swp_entry_to_pte(x)))
|
|
|
|
#ifdef CONFIG_MEM_SOFT_DIRTY
|
|
#define _PAGE_SWP_SOFT_DIRTY (1UL << (SWP_TYPE_BITS + _PAGE_BIT_SWAP_TYPE))
|
|
#else
|
|
#define _PAGE_SWP_SOFT_DIRTY 0UL
|
|
#endif /* CONFIG_MEM_SOFT_DIRTY */
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
|
|
static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SWP_SOFT_DIRTY));
|
|
}
|
|
|
|
static inline bool pte_swp_soft_dirty(pte_t pte)
|
|
{
|
|
return !!(pte_raw(pte) & cpu_to_be64(_PAGE_SWP_SOFT_DIRTY));
|
|
}
|
|
|
|
static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
|
|
{
|
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_SWP_SOFT_DIRTY));
|
|
}
|
|
#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
|
|
|
|
static inline bool check_pte_access(unsigned long access, unsigned long ptev)
|
|
{
|
|
/*
|
|
* This check for _PAGE_RWX and _PAGE_PRESENT bits
|
|
*/
|
|
if (access & ~ptev)
|
|
return false;
|
|
/*
|
|
* This check for access to privilege space
|
|
*/
|
|
if ((access & _PAGE_PRIVILEGED) != (ptev & _PAGE_PRIVILEGED))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
/*
|
|
* Generic functions with hash/radix callbacks
|
|
*/
|
|
|
|
static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
|
|
pte_t *ptep, pte_t entry,
|
|
unsigned long address,
|
|
int psize)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__ptep_set_access_flags(vma, ptep, entry,
|
|
address, psize);
|
|
return hash__ptep_set_access_flags(ptep, entry);
|
|
}
|
|
|
|
#define __HAVE_ARCH_PTE_SAME
|
|
static inline int pte_same(pte_t pte_a, pte_t pte_b)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__pte_same(pte_a, pte_b);
|
|
return hash__pte_same(pte_a, pte_b);
|
|
}
|
|
|
|
static inline int pte_none(pte_t pte)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__pte_none(pte);
|
|
return hash__pte_none(pte);
|
|
}
|
|
|
|
static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep, pte_t pte, int percpu)
|
|
{
|
|
|
|
VM_WARN_ON(!(pte_raw(pte) & cpu_to_be64(_PAGE_PTE)));
|
|
/*
|
|
* Keep the _PAGE_PTE added till we are sure we handle _PAGE_PTE
|
|
* in all the callers.
|
|
*/
|
|
pte = __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_PTE));
|
|
|
|
if (radix_enabled())
|
|
return radix__set_pte_at(mm, addr, ptep, pte, percpu);
|
|
return hash__set_pte_at(mm, addr, ptep, pte, percpu);
|
|
}
|
|
|
|
#define _PAGE_CACHE_CTL (_PAGE_SAO | _PAGE_NON_IDEMPOTENT | _PAGE_TOLERANT)
|
|
|
|
#define pgprot_noncached pgprot_noncached
|
|
static inline pgprot_t pgprot_noncached(pgprot_t prot)
|
|
{
|
|
return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) |
|
|
_PAGE_NON_IDEMPOTENT);
|
|
}
|
|
|
|
#define pgprot_noncached_wc pgprot_noncached_wc
|
|
static inline pgprot_t pgprot_noncached_wc(pgprot_t prot)
|
|
{
|
|
return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) |
|
|
_PAGE_TOLERANT);
|
|
}
|
|
|
|
#define pgprot_cached pgprot_cached
|
|
static inline pgprot_t pgprot_cached(pgprot_t prot)
|
|
{
|
|
return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL));
|
|
}
|
|
|
|
#define pgprot_writecombine pgprot_writecombine
|
|
static inline pgprot_t pgprot_writecombine(pgprot_t prot)
|
|
{
|
|
return pgprot_noncached_wc(prot);
|
|
}
|
|
/*
|
|
* check a pte mapping have cache inhibited property
|
|
*/
|
|
static inline bool pte_ci(pte_t pte)
|
|
{
|
|
__be64 pte_v = pte_raw(pte);
|
|
|
|
if (((pte_v & cpu_to_be64(_PAGE_CACHE_CTL)) == cpu_to_be64(_PAGE_TOLERANT)) ||
|
|
((pte_v & cpu_to_be64(_PAGE_CACHE_CTL)) == cpu_to_be64(_PAGE_NON_IDEMPOTENT)))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static inline void pmd_clear(pmd_t *pmdp)
|
|
{
|
|
if (IS_ENABLED(CONFIG_DEBUG_VM) && !radix_enabled()) {
|
|
/*
|
|
* Don't use this if we can possibly have a hash page table
|
|
* entry mapping this.
|
|
*/
|
|
WARN_ON((pmd_val(*pmdp) & (H_PAGE_HASHPTE | _PAGE_PTE)) == (H_PAGE_HASHPTE | _PAGE_PTE));
|
|
}
|
|
*pmdp = __pmd(0);
|
|
}
|
|
|
|
static inline int pmd_none(pmd_t pmd)
|
|
{
|
|
return !pmd_raw(pmd);
|
|
}
|
|
|
|
static inline int pmd_present(pmd_t pmd)
|
|
{
|
|
/*
|
|
* A pmd is considerent present if _PAGE_PRESENT is set.
|
|
* We also need to consider the pmd present which is marked
|
|
* invalid during a split. Hence we look for _PAGE_INVALID
|
|
* if we find _PAGE_PRESENT cleared.
|
|
*/
|
|
if (pmd_raw(pmd) & cpu_to_be64(_PAGE_PRESENT | _PAGE_INVALID))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline int pmd_is_serializing(pmd_t pmd)
|
|
{
|
|
/*
|
|
* If the pmd is undergoing a split, the _PAGE_PRESENT bit is clear
|
|
* and _PAGE_INVALID is set (see pmd_present, pmdp_invalidate).
|
|
*
|
|
* This condition may also occur when flushing a pmd while flushing
|
|
* it (see ptep_modify_prot_start), so callers must ensure this
|
|
* case is fine as well.
|
|
*/
|
|
if ((pmd_raw(pmd) & cpu_to_be64(_PAGE_PRESENT | _PAGE_INVALID)) ==
|
|
cpu_to_be64(_PAGE_INVALID))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline int pmd_bad(pmd_t pmd)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__pmd_bad(pmd);
|
|
return hash__pmd_bad(pmd);
|
|
}
|
|
|
|
static inline void pud_clear(pud_t *pudp)
|
|
{
|
|
if (IS_ENABLED(CONFIG_DEBUG_VM) && !radix_enabled()) {
|
|
/*
|
|
* Don't use this if we can possibly have a hash page table
|
|
* entry mapping this.
|
|
*/
|
|
WARN_ON((pud_val(*pudp) & (H_PAGE_HASHPTE | _PAGE_PTE)) == (H_PAGE_HASHPTE | _PAGE_PTE));
|
|
}
|
|
*pudp = __pud(0);
|
|
}
|
|
|
|
static inline int pud_none(pud_t pud)
|
|
{
|
|
return !pud_raw(pud);
|
|
}
|
|
|
|
static inline int pud_present(pud_t pud)
|
|
{
|
|
return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PRESENT));
|
|
}
|
|
|
|
extern struct page *pud_page(pud_t pud);
|
|
extern struct page *pmd_page(pmd_t pmd);
|
|
static inline pte_t pud_pte(pud_t pud)
|
|
{
|
|
return __pte_raw(pud_raw(pud));
|
|
}
|
|
|
|
static inline pud_t pte_pud(pte_t pte)
|
|
{
|
|
return __pud_raw(pte_raw(pte));
|
|
}
|
|
#define pud_write(pud) pte_write(pud_pte(pud))
|
|
|
|
static inline int pud_bad(pud_t pud)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__pud_bad(pud);
|
|
return hash__pud_bad(pud);
|
|
}
|
|
|
|
#define pud_access_permitted pud_access_permitted
|
|
static inline bool pud_access_permitted(pud_t pud, bool write)
|
|
{
|
|
return pte_access_permitted(pud_pte(pud), write);
|
|
}
|
|
|
|
#define __p4d_raw(x) ((p4d_t) { __pgd_raw(x) })
|
|
static inline __be64 p4d_raw(p4d_t x)
|
|
{
|
|
return pgd_raw(x.pgd);
|
|
}
|
|
|
|
#define p4d_write(p4d) pte_write(p4d_pte(p4d))
|
|
|
|
static inline void p4d_clear(p4d_t *p4dp)
|
|
{
|
|
*p4dp = __p4d(0);
|
|
}
|
|
|
|
static inline int p4d_none(p4d_t p4d)
|
|
{
|
|
return !p4d_raw(p4d);
|
|
}
|
|
|
|
static inline int p4d_present(p4d_t p4d)
|
|
{
|
|
return !!(p4d_raw(p4d) & cpu_to_be64(_PAGE_PRESENT));
|
|
}
|
|
|
|
static inline pte_t p4d_pte(p4d_t p4d)
|
|
{
|
|
return __pte_raw(p4d_raw(p4d));
|
|
}
|
|
|
|
static inline p4d_t pte_p4d(pte_t pte)
|
|
{
|
|
return __p4d_raw(pte_raw(pte));
|
|
}
|
|
|
|
static inline int p4d_bad(p4d_t p4d)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__p4d_bad(p4d);
|
|
return hash__p4d_bad(p4d);
|
|
}
|
|
|
|
#define p4d_access_permitted p4d_access_permitted
|
|
static inline bool p4d_access_permitted(p4d_t p4d, bool write)
|
|
{
|
|
return pte_access_permitted(p4d_pte(p4d), write);
|
|
}
|
|
|
|
extern struct page *p4d_page(p4d_t p4d);
|
|
|
|
/* Pointers in the page table tree are physical addresses */
|
|
#define __pgtable_ptr_val(ptr) __pa(ptr)
|
|
|
|
static inline pud_t *p4d_pgtable(p4d_t p4d)
|
|
{
|
|
return (pud_t *)__va(p4d_val(p4d) & ~P4D_MASKED_BITS);
|
|
}
|
|
|
|
static inline pmd_t *pud_pgtable(pud_t pud)
|
|
{
|
|
return (pmd_t *)__va(pud_val(pud) & ~PUD_MASKED_BITS);
|
|
}
|
|
|
|
#define pte_ERROR(e) \
|
|
pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
|
|
#define pmd_ERROR(e) \
|
|
pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
|
|
#define pud_ERROR(e) \
|
|
pr_err("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e))
|
|
#define pgd_ERROR(e) \
|
|
pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
|
|
|
|
static inline int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot)
|
|
{
|
|
if (radix_enabled()) {
|
|
#if defined(CONFIG_PPC_RADIX_MMU) && defined(DEBUG_VM)
|
|
unsigned long page_size = 1 << mmu_psize_defs[mmu_io_psize].shift;
|
|
WARN((page_size != PAGE_SIZE), "I/O page size != PAGE_SIZE");
|
|
#endif
|
|
return radix__map_kernel_page(ea, pa, prot, PAGE_SIZE);
|
|
}
|
|
return hash__map_kernel_page(ea, pa, prot);
|
|
}
|
|
|
|
void unmap_kernel_page(unsigned long va);
|
|
|
|
static inline int __meminit vmemmap_create_mapping(unsigned long start,
|
|
unsigned long page_size,
|
|
unsigned long phys)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__vmemmap_create_mapping(start, page_size, phys);
|
|
return hash__vmemmap_create_mapping(start, page_size, phys);
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
static inline void vmemmap_remove_mapping(unsigned long start,
|
|
unsigned long page_size)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__vmemmap_remove_mapping(start, page_size);
|
|
return hash__vmemmap_remove_mapping(start, page_size);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_PAGEALLOC
|
|
static inline void __kernel_map_pages(struct page *page, int numpages, int enable)
|
|
{
|
|
if (radix_enabled())
|
|
radix__kernel_map_pages(page, numpages, enable);
|
|
else
|
|
hash__kernel_map_pages(page, numpages, enable);
|
|
}
|
|
#endif
|
|
|
|
static inline pte_t pmd_pte(pmd_t pmd)
|
|
{
|
|
return __pte_raw(pmd_raw(pmd));
|
|
}
|
|
|
|
static inline pmd_t pte_pmd(pte_t pte)
|
|
{
|
|
return __pmd_raw(pte_raw(pte));
|
|
}
|
|
|
|
static inline pte_t *pmdp_ptep(pmd_t *pmd)
|
|
{
|
|
return (pte_t *)pmd;
|
|
}
|
|
#define pmd_pfn(pmd) pte_pfn(pmd_pte(pmd))
|
|
#define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd))
|
|
#define pmd_young(pmd) pte_young(pmd_pte(pmd))
|
|
#define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd)))
|
|
#define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd)))
|
|
#define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd)))
|
|
#define pmd_mkclean(pmd) pte_pmd(pte_mkclean(pmd_pte(pmd)))
|
|
#define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd)))
|
|
#define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd)))
|
|
#define pmd_mk_savedwrite(pmd) pte_pmd(pte_mk_savedwrite(pmd_pte(pmd)))
|
|
#define pmd_clear_savedwrite(pmd) pte_pmd(pte_clear_savedwrite(pmd_pte(pmd)))
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
|
|
#define pmd_soft_dirty(pmd) pte_soft_dirty(pmd_pte(pmd))
|
|
#define pmd_mksoft_dirty(pmd) pte_pmd(pte_mksoft_dirty(pmd_pte(pmd)))
|
|
#define pmd_clear_soft_dirty(pmd) pte_pmd(pte_clear_soft_dirty(pmd_pte(pmd)))
|
|
|
|
#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
|
|
#define pmd_swp_mksoft_dirty(pmd) pte_pmd(pte_swp_mksoft_dirty(pmd_pte(pmd)))
|
|
#define pmd_swp_soft_dirty(pmd) pte_swp_soft_dirty(pmd_pte(pmd))
|
|
#define pmd_swp_clear_soft_dirty(pmd) pte_pmd(pte_swp_clear_soft_dirty(pmd_pte(pmd)))
|
|
#endif
|
|
#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
|
|
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
static inline int pmd_protnone(pmd_t pmd)
|
|
{
|
|
return pte_protnone(pmd_pte(pmd));
|
|
}
|
|
#endif /* CONFIG_NUMA_BALANCING */
|
|
|
|
#define pmd_write(pmd) pte_write(pmd_pte(pmd))
|
|
#define __pmd_write(pmd) __pte_write(pmd_pte(pmd))
|
|
#define pmd_savedwrite(pmd) pte_savedwrite(pmd_pte(pmd))
|
|
|
|
#define pmd_access_permitted pmd_access_permitted
|
|
static inline bool pmd_access_permitted(pmd_t pmd, bool write)
|
|
{
|
|
/*
|
|
* pmdp_invalidate sets this combination (which is not caught by
|
|
* !pte_present() check in pte_access_permitted), to prevent
|
|
* lock-free lookups, as part of the serialize_against_pte_lookup()
|
|
* synchronisation.
|
|
*
|
|
* This also catches the case where the PTE's hardware PRESENT bit is
|
|
* cleared while TLB is flushed, which is suboptimal but should not
|
|
* be frequent.
|
|
*/
|
|
if (pmd_is_serializing(pmd))
|
|
return false;
|
|
|
|
return pte_access_permitted(pmd_pte(pmd), write);
|
|
}
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
extern pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot);
|
|
extern pmd_t mk_pmd(struct page *page, pgprot_t pgprot);
|
|
extern pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot);
|
|
extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
|
|
pmd_t *pmdp, pmd_t pmd);
|
|
static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
|
|
unsigned long addr, pmd_t *pmd)
|
|
{
|
|
}
|
|
|
|
extern int hash__has_transparent_hugepage(void);
|
|
static inline int has_transparent_hugepage(void)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__has_transparent_hugepage();
|
|
return hash__has_transparent_hugepage();
|
|
}
|
|
#define has_transparent_hugepage has_transparent_hugepage
|
|
|
|
static inline unsigned long
|
|
pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp,
|
|
unsigned long clr, unsigned long set)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__pmd_hugepage_update(mm, addr, pmdp, clr, set);
|
|
return hash__pmd_hugepage_update(mm, addr, pmdp, clr, set);
|
|
}
|
|
|
|
/*
|
|
* returns true for pmd migration entries, THP, devmap, hugetlb
|
|
* But compile time dependent on THP config
|
|
*/
|
|
static inline int pmd_large(pmd_t pmd)
|
|
{
|
|
return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE));
|
|
}
|
|
|
|
/*
|
|
* For radix we should always find H_PAGE_HASHPTE zero. Hence
|
|
* the below will work for radix too
|
|
*/
|
|
static inline int __pmdp_test_and_clear_young(struct mm_struct *mm,
|
|
unsigned long addr, pmd_t *pmdp)
|
|
{
|
|
unsigned long old;
|
|
|
|
if ((pmd_raw(*pmdp) & cpu_to_be64(_PAGE_ACCESSED | H_PAGE_HASHPTE)) == 0)
|
|
return 0;
|
|
old = pmd_hugepage_update(mm, addr, pmdp, _PAGE_ACCESSED, 0);
|
|
return ((old & _PAGE_ACCESSED) != 0);
|
|
}
|
|
|
|
#define __HAVE_ARCH_PMDP_SET_WRPROTECT
|
|
static inline void pmdp_set_wrprotect(struct mm_struct *mm, unsigned long addr,
|
|
pmd_t *pmdp)
|
|
{
|
|
if (__pmd_write((*pmdp)))
|
|
pmd_hugepage_update(mm, addr, pmdp, _PAGE_WRITE, 0);
|
|
else if (unlikely(pmd_savedwrite(*pmdp)))
|
|
pmd_hugepage_update(mm, addr, pmdp, 0, _PAGE_PRIVILEGED);
|
|
}
|
|
|
|
/*
|
|
* Only returns true for a THP. False for pmd migration entry.
|
|
* We also need to return true when we come across a pte that
|
|
* in between a thp split. While splitting THP, we mark the pmd
|
|
* invalid (pmdp_invalidate()) before we set it with pte page
|
|
* address. A pmd_trans_huge() check against a pmd entry during that time
|
|
* should return true.
|
|
* We should not call this on a hugetlb entry. We should check for HugeTLB
|
|
* entry using vma->vm_flags
|
|
* The page table walk rule is explained in Documentation/vm/transhuge.rst
|
|
*/
|
|
static inline int pmd_trans_huge(pmd_t pmd)
|
|
{
|
|
if (!pmd_present(pmd))
|
|
return false;
|
|
|
|
if (radix_enabled())
|
|
return radix__pmd_trans_huge(pmd);
|
|
return hash__pmd_trans_huge(pmd);
|
|
}
|
|
|
|
#define __HAVE_ARCH_PMD_SAME
|
|
static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__pmd_same(pmd_a, pmd_b);
|
|
return hash__pmd_same(pmd_a, pmd_b);
|
|
}
|
|
|
|
static inline pmd_t __pmd_mkhuge(pmd_t pmd)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__pmd_mkhuge(pmd);
|
|
return hash__pmd_mkhuge(pmd);
|
|
}
|
|
|
|
/*
|
|
* pfn_pmd return a pmd_t that can be used as pmd pte entry.
|
|
*/
|
|
static inline pmd_t pmd_mkhuge(pmd_t pmd)
|
|
{
|
|
#ifdef CONFIG_DEBUG_VM
|
|
if (radix_enabled())
|
|
WARN_ON((pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE)) == 0);
|
|
else
|
|
WARN_ON((pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE | H_PAGE_THP_HUGE)) !=
|
|
cpu_to_be64(_PAGE_PTE | H_PAGE_THP_HUGE));
|
|
#endif
|
|
return pmd;
|
|
}
|
|
|
|
#define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
|
|
extern int pmdp_set_access_flags(struct vm_area_struct *vma,
|
|
unsigned long address, pmd_t *pmdp,
|
|
pmd_t entry, int dirty);
|
|
|
|
#define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
|
|
extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
|
|
unsigned long address, pmd_t *pmdp);
|
|
|
|
#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
|
|
static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
|
|
unsigned long addr, pmd_t *pmdp)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__pmdp_huge_get_and_clear(mm, addr, pmdp);
|
|
return hash__pmdp_huge_get_and_clear(mm, addr, pmdp);
|
|
}
|
|
|
|
static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
|
|
unsigned long address, pmd_t *pmdp)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__pmdp_collapse_flush(vma, address, pmdp);
|
|
return hash__pmdp_collapse_flush(vma, address, pmdp);
|
|
}
|
|
#define pmdp_collapse_flush pmdp_collapse_flush
|
|
|
|
#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL
|
|
pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma,
|
|
unsigned long addr,
|
|
pmd_t *pmdp, int full);
|
|
|
|
#define __HAVE_ARCH_PGTABLE_DEPOSIT
|
|
static inline void pgtable_trans_huge_deposit(struct mm_struct *mm,
|
|
pmd_t *pmdp, pgtable_t pgtable)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__pgtable_trans_huge_deposit(mm, pmdp, pgtable);
|
|
return hash__pgtable_trans_huge_deposit(mm, pmdp, pgtable);
|
|
}
|
|
|
|
#define __HAVE_ARCH_PGTABLE_WITHDRAW
|
|
static inline pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm,
|
|
pmd_t *pmdp)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__pgtable_trans_huge_withdraw(mm, pmdp);
|
|
return hash__pgtable_trans_huge_withdraw(mm, pmdp);
|
|
}
|
|
|
|
#define __HAVE_ARCH_PMDP_INVALIDATE
|
|
extern pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
|
|
pmd_t *pmdp);
|
|
|
|
#define pmd_move_must_withdraw pmd_move_must_withdraw
|
|
struct spinlock;
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|
extern int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl,
|
|
struct spinlock *old_pmd_ptl,
|
|
struct vm_area_struct *vma);
|
|
/*
|
|
* Hash translation mode use the deposited table to store hash pte
|
|
* slot information.
|
|
*/
|
|
#define arch_needs_pgtable_deposit arch_needs_pgtable_deposit
|
|
static inline bool arch_needs_pgtable_deposit(void)
|
|
{
|
|
if (radix_enabled())
|
|
return false;
|
|
return true;
|
|
}
|
|
extern void serialize_against_pte_lookup(struct mm_struct *mm);
|
|
|
|
|
|
static inline pmd_t pmd_mkdevmap(pmd_t pmd)
|
|
{
|
|
if (radix_enabled())
|
|
return radix__pmd_mkdevmap(pmd);
|
|
return hash__pmd_mkdevmap(pmd);
|
|
}
|
|
|
|
static inline int pmd_devmap(pmd_t pmd)
|
|
{
|
|
return pte_devmap(pmd_pte(pmd));
|
|
}
|
|
|
|
static inline int pud_devmap(pud_t pud)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int pgd_devmap(pgd_t pgd)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
|
|
static inline int pud_pfn(pud_t pud)
|
|
{
|
|
/*
|
|
* Currently all calls to pud_pfn() are gated around a pud_devmap()
|
|
* check so this should never be used. If it grows another user we
|
|
* want to know about it.
|
|
*/
|
|
BUILD_BUG();
|
|
return 0;
|
|
}
|
|
#define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
|
|
pte_t ptep_modify_prot_start(struct vm_area_struct *, unsigned long, pte_t *);
|
|
void ptep_modify_prot_commit(struct vm_area_struct *, unsigned long,
|
|
pte_t *, pte_t, pte_t);
|
|
|
|
/*
|
|
* Returns true for a R -> RW upgrade of pte
|
|
*/
|
|
static inline bool is_pte_rw_upgrade(unsigned long old_val, unsigned long new_val)
|
|
{
|
|
if (!(old_val & _PAGE_READ))
|
|
return false;
|
|
|
|
if ((!(old_val & _PAGE_WRITE)) && (new_val & _PAGE_WRITE))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Like pmd_huge() and pmd_large(), but works regardless of config options
|
|
*/
|
|
#define pmd_is_leaf pmd_is_leaf
|
|
#define pmd_leaf pmd_is_leaf
|
|
static inline bool pmd_is_leaf(pmd_t pmd)
|
|
{
|
|
return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE));
|
|
}
|
|
|
|
#define pud_is_leaf pud_is_leaf
|
|
#define pud_leaf pud_is_leaf
|
|
static inline bool pud_is_leaf(pud_t pud)
|
|
{
|
|
return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE));
|
|
}
|
|
|
|
#define p4d_is_leaf p4d_is_leaf
|
|
#define p4d_leaf p4d_is_leaf
|
|
static inline bool p4d_is_leaf(p4d_t p4d)
|
|
{
|
|
return !!(p4d_raw(p4d) & cpu_to_be64(_PAGE_PTE));
|
|
}
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ */
|