diff options
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/io.h | 2 | ||||
| -rw-r--r-- | include/asm-generic/pgtable.h | 1322 |
2 files changed, 1 insertions, 1323 deletions
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index 3a7871130112..8b1e020e9a03 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -972,7 +972,7 @@ static inline void iounmap(void __iomem *addr) } #endif #elif defined(CONFIG_GENERIC_IOREMAP) -#include <asm/pgtable.h> +#include <linux/pgtable.h> void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot); void iounmap(volatile void __iomem *addr); diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h deleted file mode 100644 index 0a9329656ae6..000000000000 --- a/include/asm-generic/pgtable.h +++ /dev/null @@ -1,1322 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#ifndef _ASM_GENERIC_PGTABLE_H -#define _ASM_GENERIC_PGTABLE_H - -#include <linux/pfn.h> - -#ifndef __ASSEMBLY__ -#ifdef CONFIG_MMU - -#include <linux/mm_types.h> -#include <linux/bug.h> -#include <linux/errno.h> -#include <asm-generic/pgtable_uffd.h> - -#if 5 - defined(__PAGETABLE_P4D_FOLDED) - defined(__PAGETABLE_PUD_FOLDED) - \ - defined(__PAGETABLE_PMD_FOLDED) != CONFIG_PGTABLE_LEVELS -#error CONFIG_PGTABLE_LEVELS is not consistent with __PAGETABLE_{P4D,PUD,PMD}_FOLDED -#endif - -/* - * On almost all architectures and configurations, 0 can be used as the - * upper ceiling to free_pgtables(): on many architectures it has the same - * effect as using TASK_SIZE. However, there is one configuration which - * must impose a more careful limit, to avoid freeing kernel pgtables. - */ -#ifndef USER_PGTABLES_CEILING -#define USER_PGTABLES_CEILING 0UL -#endif - -#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS -extern int ptep_set_access_flags(struct vm_area_struct *vma, - unsigned long address, pte_t *ptep, - pte_t entry, int dirty); -#endif - -#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -extern int pmdp_set_access_flags(struct vm_area_struct *vma, - unsigned long address, pmd_t *pmdp, - pmd_t entry, int dirty); -extern int pudp_set_access_flags(struct vm_area_struct *vma, - unsigned long address, pud_t *pudp, - pud_t entry, int dirty); -#else -static inline int pmdp_set_access_flags(struct vm_area_struct *vma, - unsigned long address, pmd_t *pmdp, - pmd_t entry, int dirty) -{ - BUILD_BUG(); - return 0; -} -static inline int pudp_set_access_flags(struct vm_area_struct *vma, - unsigned long address, pud_t *pudp, - pud_t entry, int dirty) -{ - BUILD_BUG(); - return 0; -} -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ -#endif - -#ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG -static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, - unsigned long address, - pte_t *ptep) -{ - pte_t pte = *ptep; - int r = 1; - if (!pte_young(pte)) - r = 0; - else - set_pte_at(vma->vm_mm, address, ptep, pte_mkold(pte)); - return r; -} -#endif - -#ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, - unsigned long address, - pmd_t *pmdp) -{ - pmd_t pmd = *pmdp; - int r = 1; - if (!pmd_young(pmd)) - r = 0; - else - set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd)); - return r; -} -#else -static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, - unsigned long address, - pmd_t *pmdp) -{ - BUILD_BUG(); - return 0; -} -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ -#endif - -#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH -int ptep_clear_flush_young(struct vm_area_struct *vma, - unsigned long address, pte_t *ptep); -#endif - -#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -extern int pmdp_clear_flush_young(struct vm_area_struct *vma, - unsigned long address, pmd_t *pmdp); -#else -/* - * Despite relevant to THP only, this API is called from generic rmap code - * under PageTransHuge(), hence needs a dummy implementation for !THP - */ -static inline int pmdp_clear_flush_young(struct vm_area_struct *vma, - unsigned long address, pmd_t *pmdp) -{ - BUILD_BUG(); - return 0; -} -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ -#endif - -#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR -static inline pte_t ptep_get_and_clear(struct mm_struct *mm, - unsigned long address, - pte_t *ptep) -{ - pte_t pte = *ptep; - pte_clear(mm, address, ptep); - return pte; -} -#endif - -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -#ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR -static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, - unsigned long address, - pmd_t *pmdp) -{ - pmd_t pmd = *pmdp; - pmd_clear(pmdp); - return pmd; -} -#endif /* __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR */ -#ifndef __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR -static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, - unsigned long address, - pud_t *pudp) -{ - pud_t pud = *pudp; - - pud_clear(pudp); - return pud; -} -#endif /* __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR */ -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ - -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -#ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL -static inline pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma, - unsigned long address, pmd_t *pmdp, - int full) -{ - return pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp); -} -#endif - -#ifndef __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR_FULL -static inline pud_t pudp_huge_get_and_clear_full(struct mm_struct *mm, - unsigned long address, pud_t *pudp, - int full) -{ - return pudp_huge_get_and_clear(mm, address, pudp); -} -#endif -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ - -#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL -static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, - unsigned long address, pte_t *ptep, - int full) -{ - pte_t pte; - pte = ptep_get_and_clear(mm, address, ptep); - return pte; -} -#endif - - -/* - * If two threads concurrently fault at the same page, the thread that - * won the race updates the PTE and its local TLB/Cache. The other thread - * gives up, simply does nothing, and continues; on architectures where - * software can update TLB, local TLB can be updated here to avoid next page - * fault. This function updates TLB only, do nothing with cache or others. - * It is the difference with function update_mmu_cache. - */ -#ifndef __HAVE_ARCH_UPDATE_MMU_TLB -static inline void update_mmu_tlb(struct vm_area_struct *vma, - unsigned long address, pte_t *ptep) -{ -} -#define __HAVE_ARCH_UPDATE_MMU_TLB -#endif - -/* - * Some architectures may be able to avoid expensive synchronization - * primitives when modifications are made to PTE's which are already - * not present, or in the process of an address space destruction. - */ -#ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL -static inline void pte_clear_not_present_full(struct mm_struct *mm, - unsigned long address, - pte_t *ptep, - int full) -{ - pte_clear(mm, address, ptep); -} -#endif - -#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH -extern pte_t ptep_clear_flush(struct vm_area_struct *vma, - unsigned long address, - pte_t *ptep); -#endif - -#ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH -extern pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, - unsigned long address, - pmd_t *pmdp); -extern pud_t pudp_huge_clear_flush(struct vm_area_struct *vma, - unsigned long address, - pud_t *pudp); -#endif - -#ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT -struct mm_struct; -static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) -{ - pte_t old_pte = *ptep; - set_pte_at(mm, address, ptep, pte_wrprotect(old_pte)); -} -#endif - -/* - * On some architectures hardware does not set page access bit when accessing - * memory page, it is responsibilty of software setting this bit. It brings - * out extra page fault penalty to track page access bit. For optimization page - * access bit can be set during all page fault flow on these arches. - * To be differentiate with macro pte_mkyoung, this macro is used on platforms - * where software maintains page access bit. - */ -#ifndef pte_sw_mkyoung -static inline pte_t pte_sw_mkyoung(pte_t pte) -{ - return pte; -} -#define pte_sw_mkyoung pte_sw_mkyoung -#endif - -#ifndef pte_savedwrite -#define pte_savedwrite pte_write -#endif - -#ifndef pte_mk_savedwrite -#define pte_mk_savedwrite pte_mkwrite -#endif - -#ifndef pte_clear_savedwrite -#define pte_clear_savedwrite pte_wrprotect -#endif - -#ifndef pmd_savedwrite -#define pmd_savedwrite pmd_write -#endif - -#ifndef pmd_mk_savedwrite -#define pmd_mk_savedwrite pmd_mkwrite -#endif - -#ifndef pmd_clear_savedwrite -#define pmd_clear_savedwrite pmd_wrprotect -#endif - -#ifndef __HAVE_ARCH_PMDP_SET_WRPROTECT -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -static inline void pmdp_set_wrprotect(struct mm_struct *mm, - unsigned long address, pmd_t *pmdp) -{ - pmd_t old_pmd = *pmdp; - set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd)); -} -#else -static inline void pmdp_set_wrprotect(struct mm_struct *mm, - unsigned long address, pmd_t *pmdp) -{ - BUILD_BUG(); -} -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ -#endif -#ifndef __HAVE_ARCH_PUDP_SET_WRPROTECT -#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD -static inline void pudp_set_wrprotect(struct mm_struct *mm, - unsigned long address, pud_t *pudp) -{ - pud_t old_pud = *pudp; - - set_pud_at(mm, address, pudp, pud_wrprotect(old_pud)); -} -#else -static inline void pudp_set_wrprotect(struct mm_struct *mm, - unsigned long address, pud_t *pudp) -{ - BUILD_BUG(); -} -#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ -#endif - -#ifndef pmdp_collapse_flush -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, - unsigned long address, pmd_t *pmdp); -#else -static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, - unsigned long address, - pmd_t *pmdp) -{ - BUILD_BUG(); - return *pmdp; -} -#define pmdp_collapse_flush pmdp_collapse_flush -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ -#endif - -#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT -extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, - pgtable_t pgtable); -#endif - -#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW -extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); -#endif - -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -/* - * This is an implementation of pmdp_establish() that is only suitable for an - * architecture that doesn't have hardware dirty/accessed bits. In this case we - * can't race with CPU which sets these bits and non-atomic aproach is fine. - */ -static inline pmd_t generic_pmdp_establish(struct vm_area_struct *vma, - unsigned long address, pmd_t *pmdp, pmd_t pmd) -{ - pmd_t old_pmd = *pmdp; - set_pmd_at(vma->vm_mm, address, pmdp, pmd); - return old_pmd; -} -#endif - -#ifndef __HAVE_ARCH_PMDP_INVALIDATE -extern pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, - pmd_t *pmdp); -#endif - -#ifndef __HAVE_ARCH_PTE_SAME -static inline int pte_same(pte_t pte_a, pte_t pte_b) -{ - return pte_val(pte_a) == pte_val(pte_b); -} -#endif - -#ifndef __HAVE_ARCH_PTE_UNUSED -/* - * Some architectures provide facilities to virtualization guests - * so that they can flag allocated pages as unused. This allows the - * host to transparently reclaim unused pages. This function returns - * whether the pte's page is unused. - */ -static inline int pte_unused(pte_t pte) -{ - return 0; -} -#endif - -#ifndef pte_access_permitted -#define pte_access_permitted(pte, write) \ - (pte_present(pte) && (!(write) || pte_write(pte))) -#endif - -#ifndef pmd_access_permitted -#define pmd_access_permitted(pmd, write) \ - (pmd_present(pmd) && (!(write) || pmd_write(pmd))) -#endif - -#ifndef pud_access_permitted -#define pud_access_permitted(pud, write) \ - (pud_present(pud) && (!(write) || pud_write(pud))) -#endif - -#ifndef p4d_access_permitted -#define p4d_access_permitted(p4d, write) \ - (p4d_present(p4d) && (!(write) || p4d_write(p4d))) -#endif - -#ifndef pgd_access_permitted -#define pgd_access_permitted(pgd, write) \ - (pgd_present(pgd) && (!(write) || pgd_write(pgd))) -#endif - -#ifndef __HAVE_ARCH_PMD_SAME -static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) -{ - return pmd_val(pmd_a) == pmd_val(pmd_b); -} - -static inline int pud_same(pud_t pud_a, pud_t pud_b) -{ - return pud_val(pud_a) == pud_val(pud_b); -} -#endif - -#ifndef __HAVE_ARCH_P4D_SAME -static inline int p4d_same(p4d_t p4d_a, p4d_t p4d_b) -{ - return p4d_val(p4d_a) == p4d_val(p4d_b); -} -#endif - -#ifndef __HAVE_ARCH_PGD_SAME -static inline int pgd_same(pgd_t pgd_a, pgd_t pgd_b) -{ - return pgd_val(pgd_a) == pgd_val(pgd_b); -} -#endif - -/* - * Use set_p*_safe(), and elide TLB flushing, when confident that *no* - * TLB flush will be required as a result of the "set". For example, use - * in scenarios where it is known ahead of time that the routine is - * setting non-present entries, or re-setting an existing entry to the - * same value. Otherwise, use the typical "set" helpers and flush the - * TLB. - */ -#define set_pte_safe(ptep, pte) \ -({ \ - WARN_ON_ONCE(pte_present(*ptep) && !pte_same(*ptep, pte)); \ - set_pte(ptep, pte); \ -}) - -#define set_pmd_safe(pmdp, pmd) \ -({ \ - WARN_ON_ONCE(pmd_present(*pmdp) && !pmd_same(*pmdp, pmd)); \ - set_pmd(pmdp, pmd); \ -}) - -#define set_pud_safe(pudp, pud) \ -({ \ - WARN_ON_ONCE(pud_present(*pudp) && !pud_same(*pudp, pud)); \ - set_pud(pudp, pud); \ -}) - -#define set_p4d_safe(p4dp, p4d) \ -({ \ - WARN_ON_ONCE(p4d_present(*p4dp) && !p4d_same(*p4dp, p4d)); \ - set_p4d(p4dp, p4d); \ -}) - -#define set_pgd_safe(pgdp, pgd) \ -({ \ - WARN_ON_ONCE(pgd_present(*pgdp) && !pgd_same(*pgdp, pgd)); \ - set_pgd(pgdp, pgd); \ -}) - -#ifndef __HAVE_ARCH_DO_SWAP_PAGE -/* - * Some architectures support metadata associated with a page. When a - * page is being swapped out, this metadata must be saved so it can be - * restored when the page is swapped back in. SPARC M7 and newer - * processors support an ADI (Application Data Integrity) tag for the - * page as metadata for the page. arch_do_swap_page() can restore this - * metadata when a page is swapped back in. - */ -static inline void arch_do_swap_page(struct mm_struct *mm, - struct vm_area_struct *vma, - unsigned long addr, - pte_t pte, pte_t oldpte) -{ - -} -#endif - -#ifndef __HAVE_ARCH_UNMAP_ONE -/* - * Some architectures support metadata associated with a page. When a - * page is being swapped out, this metadata must be saved so it can be - * restored when the page is swapped back in. SPARC M7 and newer - * processors support an ADI (Application Data Integrity) tag for the - * page as metadata for the page. arch_unmap_one() can save this - * metadata on a swap-out of a page. - */ -static inline int arch_unmap_one(struct mm_struct *mm, - struct vm_area_struct *vma, - unsigned long addr, - pte_t orig_pte) -{ - return 0; -} -#endif - -#ifndef __HAVE_ARCH_PGD_OFFSET_GATE -#define pgd_offset_gate(mm, addr) pgd_offset(mm, addr) -#endif - -#ifndef __HAVE_ARCH_MOVE_PTE -#define move_pte(pte, prot, old_addr, new_addr) (pte) -#endif - -#ifndef pte_accessible -# define pte_accessible(mm, pte) ((void)(pte), 1) -#endif - -#ifndef flush_tlb_fix_spurious_fault -#define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address) -#endif - -#ifndef pgprot_nx -#define pgprot_nx(prot) (prot) -#endif - -#ifndef pgprot_noncached -#define pgprot_noncached(prot) (prot) -#endif - -#ifndef pgprot_writecombine -#define pgprot_writecombine pgprot_noncached -#endif - -#ifndef pgprot_writethrough -#define pgprot_writethrough pgprot_noncached -#endif - -#ifndef pgprot_device -#define pgprot_device pgprot_noncached -#endif - -#ifndef pgprot_modify -#define pgprot_modify pgprot_modify -static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) -{ - if (pgprot_val(oldprot) == pgprot_val(pgprot_noncached(oldprot))) - newprot = pgprot_noncached(newprot); - if (pgprot_val(oldprot) == pgprot_val(pgprot_writecombine(oldprot))) - newprot = pgprot_writecombine(newprot); - if (pgprot_val(oldprot) == pgprot_val(pgprot_device(oldprot))) - newprot = pgprot_device(newprot); - return newprot; -} -#endif - -/* - * When walking page tables, get the address of the next boundary, - * or the end address of the range if that comes earlier. Although no - * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout. - */ - -#define pgd_addr_end(addr, end) \ -({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \ - (__boundary - 1 < (end) - 1)? __boundary: (end); \ -}) - -#ifndef p4d_addr_end -#define p4d_addr_end(addr, end) \ -({ unsigned long __boundary = ((addr) + P4D_SIZE) & P4D_MASK; \ - (__boundary - 1 < (end) - 1)? __boundary: (end); \ -}) -#endif - -#ifndef pud_addr_end -#define pud_addr_end(addr, end) \ -({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \ - (__boundary - 1 < (end) - 1)? __boundary: (end); \ -}) -#endif - -#ifndef pmd_addr_end -#define pmd_addr_end(addr, end) \ -({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \ - (__boundary - 1 < (end) - 1)? __boundary: (end); \ -}) -#endif - -/* - * When walking page tables, we usually want to skip any p?d_none entries; - * and any p?d_bad entries - reporting the error before resetting to none. - * Do the tests inline, but report and clear the bad entry in mm/memory.c. - */ -void pgd_clear_bad(pgd_t *); - -#ifndef __PAGETABLE_P4D_FOLDED -void p4d_clear_bad(p4d_t *); -#else -#define p4d_clear_bad(p4d) do { } while (0) -#endif - -#ifndef __PAGETABLE_PUD_FOLDED -void pud_clear_bad(pud_t *); -#else -#define pud_clear_bad(p4d) do { } while (0) -#endif - -void pmd_clear_bad(pmd_t *); - -static inline int pgd_none_or_clear_bad(pgd_t *pgd) -{ - if (pgd_none(*pgd)) - return 1; - if (unlikely(pgd_bad(*pgd))) { - pgd_clear_bad(pgd); - return 1; - } - return 0; -} - -static inline int p4d_none_or_clear_bad(p4d_t *p4d) -{ - if (p4d_none(*p4d)) - return 1; - if (unlikely(p4d_bad(*p4d))) { - p4d_clear_bad(p4d); - return 1; - } - return 0; -} - -static inline int pud_none_or_clear_bad(pud_t *pud) -{ - if (pud_none(*pud)) - return 1; - if (unlikely(pud_bad(*pud))) { - pud_clear_bad(pud); - return 1; - } - return 0; -} - -static inline int pmd_none_or_clear_bad(pmd_t *pmd) -{ - if (pmd_none(*pmd)) - return 1; - if (unlikely(pmd_bad(*pmd))) { - pmd_clear_bad(pmd); - return 1; - } - return 0; -} - -static inline pte_t __ptep_modify_prot_start(struct vm_area_struct *vma, - unsigned long addr, - pte_t *ptep) -{ - /* - * Get the current pte state, but zero it out to make it - * non-present, preventing the hardware from asynchronously - * updating it. - */ - return ptep_get_and_clear(vma->vm_mm, addr, ptep); -} - -static inline void __ptep_modify_prot_commit(struct vm_area_struct *vma, - unsigned long addr, - pte_t *ptep, pte_t pte) -{ - /* - * The pte is non-present, so there's no hardware state to - * preserve. - */ - set_pte_at(vma->vm_mm, addr, ptep, pte); -} - -#ifndef __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION -/* - * Start a pte protection read-modify-write transaction, which - * protects against asynchronous hardware modifications to the pte. - * The intention is not to prevent the hardware from making pte - * updates, but to prevent any updates it may make from being lost. - * - * This does not protect against other software modifications of the - * pte; the appropriate pte lock must be held over the transation. - * - * Note that this interface is intended to be batchable, meaning that - * ptep_modify_prot_commit may not actually update the pte, but merely - * queue the update to be done at some later time. The update must be - * actually committed before the pte lock is released, however. - */ -static inline pte_t ptep_modify_prot_start(struct vm_area_struct *vma, - unsigned long addr, - pte_t *ptep) -{ - return __ptep_modify_prot_start(vma, addr, ptep); -} - -/* - * Commit an update to a pte, leaving any hardware-controlled bits in - * the PTE unmodified. - */ -static inline void ptep_modify_prot_commit(struct vm_area_struct *vma, - unsigned long addr, - pte_t *ptep, pte_t old_pte, pte_t pte) -{ - __ptep_modify_prot_commit(vma, addr, ptep, pte); -} -#endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */ -#endif /* CONFIG_MMU */ - -/* - * No-op macros that just return the current protection value. Defined here - * because these macros can be used used even if CONFIG_MMU is not defined. - */ -#ifndef pgprot_encrypted -#define pgprot_encrypted(prot) (prot) -#endif - -#ifndef pgprot_decrypted -#define pgprot_decrypted(prot) (prot) -#endif - -/* - * A facility to provide lazy MMU batching. This allows PTE updates and - * page invalidations to be delayed until a call to leave lazy MMU mode - * is issued. Some architectures may benefit from doing this, and it is - * beneficial for both shadow and direct mode hypervisors, which may batch - * the PTE updates which happen during this window. Note that using this - * interface requires that read hazards be removed from the code. A read - * hazard could result in the direct mode hypervisor case, since the actual - * write to the page tables may not yet have taken place, so reads though - * a raw PTE pointer after it has been modified are not guaranteed to be - * up to date. This mode can only be entered and left under the protection of - * the page table locks for all page tables which may be modified. In the UP - * case, this is required so that preemption is disabled, and in the SMP case, - * it must synchronize the delayed page table writes properly on other CPUs. - */ -#ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE -#define arch_enter_lazy_mmu_mode() do {} while (0) -#define arch_leave_lazy_mmu_mode() do {} while (0) -#define arch_flush_lazy_mmu_mode() do {} while (0) -#endif - -/* - * A facility to provide batching of the reload of page tables and - * other process state with the actual context switch code for - * paravirtualized guests. By convention, only one of the batched - * update (lazy) modes (CPU, MMU) should be active at any given time, - * entry should never be nested, and entry and exits should always be - * paired. This is for sanity of maintaining and reasoning about the - * kernel code. In this case, the exit (end of the context switch) is - * in architecture-specific code, and so doesn't need a generic - * definition. - */ -#ifndef __HAVE_ARCH_START_CONTEXT_SWITCH -#define arch_start_context_switch(prev) do {} while (0) -#endif - -#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY -#ifndef CONFIG_ARCH_ENABLE_THP_MIGRATION -static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) -{ - return pmd; -} - -static inline int pmd_swp_soft_dirty(pmd_t pmd) -{ - return 0; -} - -static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd) -{ - return pmd; -} -#endif -#else /* !CONFIG_HAVE_ARCH_SOFT_DIRTY */ -static inline int pte_soft_dirty(pte_t pte) -{ - return 0; -} - -static inline int pmd_soft_dirty(pmd_t pmd) -{ - return 0; -} - -static inline pte_t pte_mksoft_dirty(pte_t pte) -{ - return pte; -} - -static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) -{ - return pmd; -} - -static inline pte_t pte_clear_soft_dirty(pte_t pte) -{ - return pte; -} - -static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) -{ - return pmd; -} - -static inline pte_t pte_swp_mksoft_dirty(pte_t pte) -{ - return pte; -} - -static inline int pte_swp_soft_dirty(pte_t pte) -{ - return 0; -} - -static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) -{ - return pte; -} - -static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) -{ - return pmd; -} - -static inline int pmd_swp_soft_dirty(pmd_t pmd) -{ - return 0; -} - -static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd) -{ - return pmd; -} -#endif - -#ifndef __HAVE_PFNMAP_TRACKING -/* - * Interfaces that can be used by architecture code to keep track of - * memory type of pfn mappings specified by the remap_pfn_range, - * vmf_insert_pfn. - */ - -/* - * track_pfn_remap is called when a _new_ pfn mapping is being established - * by remap_pfn_range() for physical range indicated by pfn and size. - */ -static inline int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, - unsigned long pfn, unsigned long addr, - unsigned long size) -{ - return 0; -} - -/* - * track_pfn_insert is called when a _new_ single pfn is established - * by vmf_insert_pfn(). - */ -static inline void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, - pfn_t pfn) -{ -} - -/* - * track_pfn_copy is called when vma that is covering the pfnmap gets - * copied through copy_page_range(). - */ -static inline int track_pfn_copy(struct vm_area_struct *vma) -{ - return 0; -} - -/* - * untrack_pfn is called while unmapping a pfnmap for a region. - * untrack can be called for a specific region indicated by pfn and size or - * can be for the entire vma (in which case pfn, size are zero). - */ -static inline void untrack_pfn(struct vm_area_struct *vma, - unsigned long pfn, unsigned long size) -{ -} - -/* - * untrack_pfn_moved is called while mremapping a pfnmap for a new region. - */ -static inline void untrack_pfn_moved(struct vm_area_struct *vma) -{ -} -#else -extern int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, - unsigned long pfn, unsigned long addr, - unsigned long size); -extern void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, - pfn_t pfn); -extern int track_pfn_copy(struct vm_area_struct *vma); -extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn, - unsigned long size); -extern void untrack_pfn_moved(struct vm_area_struct *vma); -#endif - -#ifdef __HAVE_COLOR_ZERO_PAGE -static inline int is_zero_pfn(unsigned long pfn) -{ - extern unsigned long zero_pfn; - unsigned long offset_from_zero_pfn = pfn - zero_pfn; - return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT); -} - -#define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr)) - -#else -static inline int is_zero_pfn(unsigned long pfn) -{ - extern unsigned long zero_pfn; - return pfn == zero_pfn; -} - -static inline unsigned long my_zero_pfn(unsigned long addr) -{ - extern unsigned long zero_pfn; - return zero_pfn; -} -#endif - -#ifdef CONFIG_MMU - -#ifndef CONFIG_TRANSPARENT_HUGEPAGE -static inline int pmd_trans_huge(pmd_t pmd) -{ - return 0; -} -#ifndef pmd_write -static inline int pmd_write(pmd_t pmd) -{ - BUG(); - return 0; -} -#endif /* pmd_write */ -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ - -#ifndef pud_write -static inline int pud_write(pud_t pud) -{ - BUG(); - return 0; -} -#endif /* pud_write */ - -#if !defined(CONFIG_ARCH_HAS_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE) -static inline int pmd_devmap(pmd_t pmd) -{ - return 0; -} -static inline int pud_devmap(pud_t pud) -{ - return 0; -} -static inline int pgd_devmap(pgd_t pgd) -{ - return 0; -} -#endif - -#if !defined(CONFIG_TRANSPARENT_HUGEPAGE) || \ - (defined(CONFIG_TRANSPARENT_HUGEPAGE) && \ - !defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)) -static inline int pud_trans_huge(pud_t pud) -{ - return 0; -} -#endif - -/* See pmd_none_or_trans_huge_or_clear_bad for discussion. */ -static inline int pud_none_or_trans_huge_or_dev_or_clear_bad(pud_t *pud) -{ - pud_t pudval = READ_ONCE(*pud); - - if (pud_none(pudval) || pud_trans_huge(pudval) || pud_devmap(pudval)) - return 1; - if (unlikely(pud_bad(pudval))) { - pud_clear_bad(pud); - return 1; - } - return 0; -} - -/* See pmd_trans_unstable for discussion. */ -static inline int pud_trans_unstable(pud_t *pud) -{ -#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && \ - defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) - return pud_none_or_trans_huge_or_dev_or_clear_bad(pud); -#else - return 0; -#endif -} - -#ifndef pmd_read_atomic -static inline pmd_t pmd_read_atomic(pmd_t *pmdp) -{ - /* - * Depend on compiler for an atomic pmd read. NOTE: this is - * only going to work, if the pmdval_t isn't larger than - * an unsigned long. - */ - return *pmdp; -} -#endif - -#ifndef arch_needs_pgtable_deposit -#define arch_needs_pgtable_deposit() (false) -#endif -/* - * This function is meant to be used by sites walking pagetables with - * the mmap_sem hold in read mode to protect against MADV_DONTNEED and - * transhuge page faults. MADV_DONTNEED can convert a transhuge pmd - * into a null pmd and the transhuge page fault can convert a null pmd - * into an hugepmd or into a regular pmd (if the hugepage allocation - * fails). While holding the mmap_sem in read mode the pmd becomes - * stable and stops changing under us only if it's not null and not a - * transhuge pmd. When those races occurs and this function makes a - * difference vs the standard pmd_none_or_clear_bad, the result is - * undefined so behaving like if the pmd was none is safe (because it - * can return none anyway). The compiler level barrier() is critically - * important to compute the two checks atomically on the same pmdval. - * - * For 32bit kernels with a 64bit large pmd_t this automatically takes - * care of reading the pmd atomically to avoid SMP race conditions - * against pmd_populate() when the mmap_sem is hold for reading by the - * caller (a special atomic read not done by "gcc" as in the generic - * version above, is also needed when THP is disabled because the page - * fault can populate the pmd from under us). - */ -static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd) -{ - pmd_t pmdval = pmd_read_atomic(pmd); - /* - * The barrier will stabilize the pmdval in a register or on - * the stack so that it will stop changing under the code. - * - * When CONFIG_TRANSPARENT_HUGEPAGE=y on x86 32bit PAE, - * pmd_read_atomic is allowed to return a not atomic pmdval - * (for example pointing to an hugepage that has never been - * mapped in the pmd). The below checks will only care about - * the low part of the pmd with 32bit PAE x86 anyway, with the - * exception of pmd_none(). So the important thing is that if - * the low part of the pmd is found null, the high part will - * be also null or the pmd_none() check below would be - * confused. - */ -#ifdef CONFIG_TRANSPARENT_HUGEPAGE - barrier(); -#endif - /* - * !pmd_present() checks for pmd migration entries - * - * The complete check uses is_pmd_migration_entry() in linux/swapops.h - * But using that requires moving current function and pmd_trans_unstable() - * to linux/swapops.h to resovle dependency, which is too much code move. - * - * !pmd_present() is equivalent to is_pmd_migration_entry() currently, - * because !pmd_present() pages can only be under migration not swapped - * out. - * - * pmd_none() is preseved for future condition checks on pmd migration - * entries and not confusing with this function name, although it is - * redundant with !pmd_present(). - */ - if (pmd_none(pmdval) || pmd_trans_huge(pmdval) || - (IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION) && !pmd_present(pmdval))) - return 1; - if (unlikely(pmd_bad(pmdval))) { - pmd_clear_bad(pmd); - return 1; - } - return 0; -} - -/* - * This is a noop if Transparent Hugepage Support is not built into - * the kernel. Otherwise it is equivalent to - * pmd_none_or_trans_huge_or_clear_bad(), and shall only be called in - * places that already verified the pmd is not none and they want to - * walk ptes while holding the mmap sem in read mode (write mode don't - * need this). If THP is not enabled, the pmd can't go away under the - * code even if MADV_DONTNEED runs, but if THP is enabled we need to - * run a pmd_trans_unstable before walking the ptes after - * split_huge_pmd returns (because it may have run when the pmd become - * null, but then a page fault can map in a THP and not a regular page). - */ -static inline int pmd_trans_unstable(pmd_t *pmd) -{ -#ifdef CONFIG_TRANSPARENT_HUGEPAGE - return pmd_none_or_trans_huge_or_clear_bad(pmd); -#else - return 0; -#endif -} - -#ifndef CONFIG_NUMA_BALANCING -/* - * Technically a PTE can be PROTNONE even when not doing NUMA balancing but - * the only case the kernel cares is for NUMA balancing and is only ever set - * when the VMA is accessible. For PROT_NONE VMAs, the PTEs are not marked - * _PAGE_PROTNONE so by by default, implement the helper as "always no". It - * is the responsibility of the caller to distinguish between PROT_NONE - * protections and NUMA hinting fault protections. - */ -static inline int pte_protnone(pte_t pte) -{ - return 0; -} - -static inline int pmd_protnone(pmd_t pmd) -{ - return 0; -} -#endif /* CONFIG_NUMA_BALANCING */ - -#endif /* CONFIG_MMU */ - -#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP - -#ifndef __PAGETABLE_P4D_FOLDED -int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot); -int p4d_clear_huge(p4d_t *p4d); -#else -static inline int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot) -{ - return 0; -} -static inline int p4d_clear_huge(p4d_t *p4d) -{ - return 0; -} -#endif /* !__PAGETABLE_P4D_FOLDED */ - -int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot); -int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot); -int pud_clear_huge(pud_t *pud); -int pmd_clear_huge(pmd_t *pmd); -int p4d_free_pud_page(p4d_t *p4d, unsigned long addr); -int pud_free_pmd_page(pud_t *pud, unsigned long addr); -int pmd_free_pte_page(pmd_t *pmd, unsigned long addr); -#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ -static inline int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot) -{ - return 0; -} -static inline int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot) -{ - return 0; -} -static inline int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot) -{ - return 0; -} -static inline int p4d_clear_huge(p4d_t *p4d) -{ - return 0; -} -static inline int pud_clear_huge(pud_t *pud) -{ - return 0; -} -static inline int pmd_clear_huge(pmd_t *pmd) -{ - return 0; -} -static inline int p4d_free_pud_page(p4d_t *p4d, unsigned long addr) -{ - return 0; -} -static inline int pud_free_pmd_page(pud_t *pud, unsigned long addr) -{ - return 0; -} -static inline int pmd_free_pte_page(pmd_t *pmd, unsigned long addr) -{ - return 0; -} -#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ - -#ifndef __HAVE_ARCH_FLUSH_PMD_TLB_RANGE -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -/* - * ARCHes with special requirements for evicting THP backing TLB entries can - * implement this. Otherwise also, it can help optimize normal TLB flush in - * THP regime. stock flush_tlb_range() typically has optimization to nuke the - * entire TLB TLB if flush span is greater than a threshold, which will - * likely be true for a single huge page. Thus a single thp flush will - * invalidate the entire TLB which is not desitable. - * e.g. see arch/arc: flush_pmd_tlb_range - */ -#define flush_pmd_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end) -#define flush_pud_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end) -#else -#define flush_pmd_tlb_range(vma, addr, end) BUILD_BUG() -#define flush_pud_tlb_range(vma, addr, end) BUILD_BUG() -#endif -#endif - -struct file; -int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, - unsigned long size, pgprot_t *vma_prot); - -#ifndef CONFIG_X86_ESPFIX64 -static inline void init_espfix_bsp(void) { } -#endif - -extern void __init pgtable_cache_init(void); - -#ifndef __HAVE_ARCH_PFN_MODIFY_ALLOWED -static inline bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot) -{ - return true; -} - -static inline bool arch_has_pfn_modify_check(void) -{ - return false; -} -#endif /* !_HAVE_ARCH_PFN_MODIFY_ALLOWED */ - -/* - * Architecture PAGE_KERNEL_* fallbacks - * - * Some architectures don't define certain PAGE_KERNEL_* flags. This is either - * because they really don't support them, or the port needs to be updated to - * reflect the required functionality. Below are a set of relatively safe - * fallbacks, as best effort, which we can count on in lieu of the architectures - * not defining them on their own yet. - */ - -#ifndef PAGE_KERNEL_RO -# define PAGE_KERNEL_RO PAGE_KERNEL -#endif - -#ifndef PAGE_KERNEL_EXEC -# define PAGE_KERNEL_EXEC PAGE_KERNEL -#endif - -/* - * Page Table Modification bits for pgtbl_mod_mask. - * - * These are used by the p?d_alloc_track*() set of functions an in the generic - * vmalloc/ioremap code to track at which page-table levels entries have been - * modified. Based on that the code can better decide when vmalloc and ioremap - * mapping changes need to be synchronized to other page-tables in the system. - */ -#define __PGTBL_PGD_MODIFIED 0 -#define __PGTBL_P4D_MODIFIED 1 -#define __PGTBL_PUD_MODIFIED 2 -#define __PGTBL_PMD_MODIFIED 3 -#define __PGTBL_PTE_MODIFIED 4 - -#define PGTBL_PGD_MODIFIED BIT(__PGTBL_PGD_MODIFIED) -#define PGTBL_P4D_MODIFIED BIT(__PGTBL_P4D_MODIFIED) -#define PGTBL_PUD_MODIFIED BIT(__PGTBL_PUD_MODIFIED) -#define PGTBL_PMD_MODIFIED BIT(__PGTBL_PMD_MODIFIED) -#define PGTBL_PTE_MODIFIED BIT(__PGTBL_PTE_MODIFIED) - -/* Page-Table Modification Mask */ -typedef unsigned int pgtbl_mod_mask; - -#endif /* !__ASSEMBLY__ */ - -#ifndef io_remap_pfn_range -#define io_remap_pfn_range remap_pfn_range -#endif - -#ifndef has_transparent_hugepage -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -#define has_transparent_hugepage() 1 -#else -#define has_transparent_hugepage() 0 -#endif -#endif - -/* - * On some architectures it depends on the mm if the p4d/pud or pmd - * layer of the page table hierarchy is folded or not. - */ -#ifndef mm_p4d_folded -#define mm_p4d_folded(mm) __is_defined(__PAGETABLE_P4D_FOLDED) -#endif - -#ifndef mm_pud_folded -#define mm_pud_folded(mm) __is_defined(__PAGETABLE_PUD_FOLDED) -#endif - -#ifndef mm_pmd_folded -#define mm_pmd_folded(mm) __is_defined(__PAGETABLE_PMD_FOLDED) -#endif - -/* - * p?d_leaf() - true if this entry is a final mapping to a physical address. - * This differs from p?d_huge() by the fact that they are always available (if - * the architecture supports large pages at the appropriate level) even - * if CONFIG_HUGETLB_PAGE is not defined. - * Only meaningful when called on a valid entry. - */ -#ifndef pgd_leaf -#define pgd_leaf(x) 0 -#endif -#ifndef p4d_leaf -#define p4d_leaf(x) 0 -#endif -#ifndef pud_leaf -#define pud_leaf(x) 0 -#endif -#ifndef pmd_leaf -#define pmd_leaf(x) 0 -#endif - -#endif /* _ASM_GENERIC_PGTABLE_H */ |