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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Linus Torvalds](/assets/img/avatar_default.png)
- Userspace support for the Memory Tagging Extension introduced by Armv8.5. Kernel support (via KASAN) is likely to follow in 5.11. - Selftests for MTE, Pointer Authentication and FPSIMD/SVE context switching. - Fix and subsequent rewrite of our Spectre mitigations, including the addition of support for PR_SPEC_DISABLE_NOEXEC. - Support for the Armv8.3 Pointer Authentication enhancements. - Support for ASID pinning, which is required when sharing page-tables with the SMMU. - MM updates, including treating flush_tlb_fix_spurious_fault() as a no-op. - Perf/PMU driver updates, including addition of the ARM CMN PMU driver and also support to handle CPU PMU IRQs as NMIs. - Allow prefetchable PCI BARs to be exposed to userspace using normal non-cacheable mappings. - Implementation of ARCH_STACKWALK for unwinding. - Improve reporting of unexpected kernel traps due to BPF JIT failure. - Improve robustness of user-visible HWCAP strings and their corresponding numerical constants. - Removal of TEXT_OFFSET. - Removal of some unused functions, parameters and prototypes. - Removal of MPIDR-based topology detection in favour of firmware description. - Cleanups to handling of SVE and FPSIMD register state in preparation for potential future optimisation of handling across syscalls. - Cleanups to the SDEI driver in preparation for support in KVM. - Miscellaneous cleanups and refactoring work. -----BEGIN PGP SIGNATURE----- iQFEBAABCgAuFiEEPxTL6PPUbjXGY88ct6xw3ITBYzQFAl+AUXMQHHdpbGxAa2Vy bmVsLm9yZwAKCRC3rHDchMFjNFc1B/4q2Kabe+pPu7s1f58Q+OTaEfqcr3F1qh27 F1YpFZUYxg0GPfPsFrnbJpo5WKo7wdR9ceI9yF/GHjs7A/MSoQJis3pG6SlAd9c0 nMU5tCwhg9wfq6asJtl0/IPWem6cqqhdzC6m808DjeHuyi2CCJTt0vFWH3OeHEhG cfmLfaSNXOXa/MjEkT8y1AXJ/8IpIpzkJeCRA1G5s18PXV9Kl5bafIo9iqyfKPLP 0rJljBmoWbzuCSMc81HmGUQI4+8KRp6HHhyZC/k0WEVgj3LiumT7am02bdjZlTnK BeNDKQsv2Jk8pXP2SlrI3hIUTz0bM6I567FzJEokepvTUzZ+CVBi =9J8H -----END PGP SIGNATURE----- Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux Pull arm64 updates from Will Deacon: "There's quite a lot of code here, but much of it is due to the addition of a new PMU driver as well as some arm64-specific selftests which is an area where we've traditionally been lagging a bit. In terms of exciting features, this includes support for the Memory Tagging Extension which narrowly missed 5.9, hopefully allowing userspace to run with use-after-free detection in production on CPUs that support it. Work is ongoing to integrate the feature with KASAN for 5.11. Another change that I'm excited about (assuming they get the hardware right) is preparing the ASID allocator for sharing the CPU page-table with the SMMU. Those changes will also come in via Joerg with the IOMMU pull. We do stray outside of our usual directories in a few places, mostly due to core changes required by MTE. Although much of this has been Acked, there were a couple of places where we unfortunately didn't get any review feedback. Other than that, we ran into a handful of minor conflicts in -next, but nothing that should post any issues. Summary: - Userspace support for the Memory Tagging Extension introduced by Armv8.5. Kernel support (via KASAN) is likely to follow in 5.11. - Selftests for MTE, Pointer Authentication and FPSIMD/SVE context switching. - Fix and subsequent rewrite of our Spectre mitigations, including the addition of support for PR_SPEC_DISABLE_NOEXEC. - Support for the Armv8.3 Pointer Authentication enhancements. - Support for ASID pinning, which is required when sharing page-tables with the SMMU. - MM updates, including treating flush_tlb_fix_spurious_fault() as a no-op. - Perf/PMU driver updates, including addition of the ARM CMN PMU driver and also support to handle CPU PMU IRQs as NMIs. - Allow prefetchable PCI BARs to be exposed to userspace using normal non-cacheable mappings. - Implementation of ARCH_STACKWALK for unwinding. - Improve reporting of unexpected kernel traps due to BPF JIT failure. - Improve robustness of user-visible HWCAP strings and their corresponding numerical constants. - Removal of TEXT_OFFSET. - Removal of some unused functions, parameters and prototypes. - Removal of MPIDR-based topology detection in favour of firmware description. - Cleanups to handling of SVE and FPSIMD register state in preparation for potential future optimisation of handling across syscalls. - Cleanups to the SDEI driver in preparation for support in KVM. - Miscellaneous cleanups and refactoring work" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (148 commits) Revert "arm64: initialize per-cpu offsets earlier" arm64: random: Remove no longer needed prototypes arm64: initialize per-cpu offsets earlier kselftest/arm64: Check mte tagged user address in kernel kselftest/arm64: Verify KSM page merge for MTE pages kselftest/arm64: Verify all different mmap MTE options kselftest/arm64: Check forked child mte memory accessibility kselftest/arm64: Verify mte tag inclusion via prctl kselftest/arm64: Add utilities and a test to validate mte memory perf: arm-cmn: Fix conversion specifiers for node type perf: arm-cmn: Fix unsigned comparison to less than zero arm64: dbm: Invalidate local TLB when setting TCR_EL1.HD arm64: mm: Make flush_tlb_fix_spurious_fault() a no-op arm64: Add support for PR_SPEC_DISABLE_NOEXEC prctl() option arm64: Pull in task_stack_page() to Spectre-v4 mitigation code KVM: arm64: Allow patching EL2 vectors even with KASLR is not enabled arm64: Get rid of arm64_ssbd_state KVM: arm64: Convert ARCH_WORKAROUND_2 to arm64_get_spectre_v4_state() KVM: arm64: Get rid of kvm_arm_have_ssbd() KVM: arm64: Simplify handling of ARCH_WORKAROUND_2 ...
1488 lines
40 KiB
C
1488 lines
40 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_PGTABLE_H
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#define _LINUX_PGTABLE_H
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#include <linux/pfn.h>
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#include <asm/pgtable.h>
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_MMU
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#include <linux/mm_types.h>
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#include <linux/bug.h>
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#include <linux/errno.h>
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#include <asm-generic/pgtable_uffd.h>
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#if 5 - defined(__PAGETABLE_P4D_FOLDED) - defined(__PAGETABLE_PUD_FOLDED) - \
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defined(__PAGETABLE_PMD_FOLDED) != CONFIG_PGTABLE_LEVELS
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#error CONFIG_PGTABLE_LEVELS is not consistent with __PAGETABLE_{P4D,PUD,PMD}_FOLDED
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#endif
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/*
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* On almost all architectures and configurations, 0 can be used as the
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* upper ceiling to free_pgtables(): on many architectures it has the same
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* effect as using TASK_SIZE. However, there is one configuration which
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* must impose a more careful limit, to avoid freeing kernel pgtables.
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*/
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#ifndef USER_PGTABLES_CEILING
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#define USER_PGTABLES_CEILING 0UL
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#endif
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/*
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* A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD]
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*
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* The pXx_index() functions return the index of the entry in the page
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* table page which would control the given virtual address
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*
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* As these functions may be used by the same code for different levels of
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* the page table folding, they are always available, regardless of
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* CONFIG_PGTABLE_LEVELS value. For the folded levels they simply return 0
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* because in such cases PTRS_PER_PxD equals 1.
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*/
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static inline unsigned long pte_index(unsigned long address)
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{
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return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
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}
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#ifndef pmd_index
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static inline unsigned long pmd_index(unsigned long address)
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{
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return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
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}
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#define pmd_index pmd_index
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#endif
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#ifndef pud_index
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static inline unsigned long pud_index(unsigned long address)
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{
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return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
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}
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#define pud_index pud_index
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#endif
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#ifndef pgd_index
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/* Must be a compile-time constant, so implement it as a macro */
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#define pgd_index(a) (((a) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
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#endif
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#ifndef pte_offset_kernel
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static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
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{
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return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
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}
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#define pte_offset_kernel pte_offset_kernel
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#endif
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#if defined(CONFIG_HIGHPTE)
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#define pte_offset_map(dir, address) \
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((pte_t *)kmap_atomic(pmd_page(*(dir))) + \
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pte_index((address)))
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#define pte_unmap(pte) kunmap_atomic((pte))
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#else
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#define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
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#define pte_unmap(pte) ((void)(pte)) /* NOP */
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#endif
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/* Find an entry in the second-level page table.. */
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#ifndef pmd_offset
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static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
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{
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return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
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}
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#define pmd_offset pmd_offset
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#endif
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#ifndef pud_offset
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static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
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{
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return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address);
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}
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#define pud_offset pud_offset
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#endif
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static inline pgd_t *pgd_offset_pgd(pgd_t *pgd, unsigned long address)
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{
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return (pgd + pgd_index(address));
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};
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/*
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* a shortcut to get a pgd_t in a given mm
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*/
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#ifndef pgd_offset
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#define pgd_offset(mm, address) pgd_offset_pgd((mm)->pgd, (address))
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#endif
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/*
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* a shortcut which implies the use of the kernel's pgd, instead
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* of a process's
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*/
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#ifndef pgd_offset_k
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#define pgd_offset_k(address) pgd_offset(&init_mm, (address))
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#endif
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/*
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* In many cases it is known that a virtual address is mapped at PMD or PTE
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* level, so instead of traversing all the page table levels, we can get a
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* pointer to the PMD entry in user or kernel page table or translate a virtual
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* address to the pointer in the PTE in the kernel page tables with simple
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* helpers.
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*/
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static inline pmd_t *pmd_off(struct mm_struct *mm, unsigned long va)
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{
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return pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, va), va), va), va);
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}
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static inline pmd_t *pmd_off_k(unsigned long va)
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{
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return pmd_offset(pud_offset(p4d_offset(pgd_offset_k(va), va), va), va);
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}
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static inline pte_t *virt_to_kpte(unsigned long vaddr)
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{
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pmd_t *pmd = pmd_off_k(vaddr);
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return pmd_none(*pmd) ? NULL : pte_offset_kernel(pmd, vaddr);
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}
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#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
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extern int ptep_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep,
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pte_t entry, int dirty);
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#endif
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#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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extern int pmdp_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp,
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pmd_t entry, int dirty);
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extern int pudp_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pud_t *pudp,
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pud_t entry, int dirty);
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#else
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static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp,
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pmd_t entry, int dirty)
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{
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BUILD_BUG();
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return 0;
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}
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static inline int pudp_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pud_t *pudp,
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pud_t entry, int dirty)
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{
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BUILD_BUG();
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return 0;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
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static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
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unsigned long address,
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pte_t *ptep)
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{
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pte_t pte = *ptep;
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int r = 1;
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if (!pte_young(pte))
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r = 0;
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else
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set_pte_at(vma->vm_mm, address, ptep, pte_mkold(pte));
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return r;
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}
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#endif
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#ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
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unsigned long address,
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pmd_t *pmdp)
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{
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pmd_t pmd = *pmdp;
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int r = 1;
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if (!pmd_young(pmd))
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r = 0;
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else
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set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd));
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return r;
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}
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#else
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static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
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unsigned long address,
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pmd_t *pmdp)
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{
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BUILD_BUG();
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return 0;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
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int ptep_clear_flush_young(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep);
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#endif
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#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp);
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#else
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/*
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* Despite relevant to THP only, this API is called from generic rmap code
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* under PageTransHuge(), hence needs a dummy implementation for !THP
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*/
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static inline int pmdp_clear_flush_young(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp)
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{
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BUILD_BUG();
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return 0;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
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static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
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unsigned long address,
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pte_t *ptep)
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{
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pte_t pte = *ptep;
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pte_clear(mm, address, ptep);
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return pte;
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}
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#endif
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#ifndef __HAVE_ARCH_PTEP_GET
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static inline pte_t ptep_get(pte_t *ptep)
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{
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return READ_ONCE(*ptep);
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}
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#endif
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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#ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
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static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
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unsigned long address,
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pmd_t *pmdp)
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{
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pmd_t pmd = *pmdp;
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pmd_clear(pmdp);
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return pmd;
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}
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#endif /* __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR */
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#ifndef __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
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static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
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unsigned long address,
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pud_t *pudp)
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{
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pud_t pud = *pudp;
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pud_clear(pudp);
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return pud;
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}
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#endif /* __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR */
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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#ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL
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static inline pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp,
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int full)
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{
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return pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
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}
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#endif
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#ifndef __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR_FULL
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static inline pud_t pudp_huge_get_and_clear_full(struct mm_struct *mm,
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unsigned long address, pud_t *pudp,
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int full)
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{
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return pudp_huge_get_and_clear(mm, address, pudp);
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}
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#endif
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
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static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
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unsigned long address, pte_t *ptep,
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int full)
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{
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pte_t pte;
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pte = ptep_get_and_clear(mm, address, ptep);
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return pte;
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}
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#endif
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/*
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* If two threads concurrently fault at the same page, the thread that
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* won the race updates the PTE and its local TLB/Cache. The other thread
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* gives up, simply does nothing, and continues; on architectures where
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* software can update TLB, local TLB can be updated here to avoid next page
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* fault. This function updates TLB only, do nothing with cache or others.
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* It is the difference with function update_mmu_cache.
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*/
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#ifndef __HAVE_ARCH_UPDATE_MMU_TLB
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static inline void update_mmu_tlb(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep)
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{
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}
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#define __HAVE_ARCH_UPDATE_MMU_TLB
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#endif
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/*
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* Some architectures may be able to avoid expensive synchronization
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* primitives when modifications are made to PTE's which are already
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* not present, or in the process of an address space destruction.
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*/
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#ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL
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static inline void pte_clear_not_present_full(struct mm_struct *mm,
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unsigned long address,
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pte_t *ptep,
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int full)
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{
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pte_clear(mm, address, ptep);
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}
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#endif
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#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
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extern pte_t ptep_clear_flush(struct vm_area_struct *vma,
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unsigned long address,
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pte_t *ptep);
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#endif
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#ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
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extern pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
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unsigned long address,
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pmd_t *pmdp);
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extern pud_t pudp_huge_clear_flush(struct vm_area_struct *vma,
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unsigned long address,
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pud_t *pudp);
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#endif
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#ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
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struct mm_struct;
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static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
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{
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pte_t old_pte = *ptep;
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set_pte_at(mm, address, ptep, pte_wrprotect(old_pte));
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}
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#endif
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/*
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* On some architectures hardware does not set page access bit when accessing
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* memory page, it is responsibilty of software setting this bit. It brings
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* out extra page fault penalty to track page access bit. For optimization page
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* access bit can be set during all page fault flow on these arches.
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* To be differentiate with macro pte_mkyoung, this macro is used on platforms
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* where software maintains page access bit.
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*/
|
|
#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
|
|
|
|
/*
|
|
* Allow architectures to preserve additional metadata associated with
|
|
* swapped-out pages. The corresponding __HAVE_ARCH_SWAP_* macros and function
|
|
* prototypes must be defined in the arch-specific asm/pgtable.h file.
|
|
*/
|
|
#ifndef __HAVE_ARCH_PREPARE_TO_SWAP
|
|
static inline int arch_prepare_to_swap(struct page *page)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_SWAP_INVALIDATE
|
|
static inline void arch_swap_invalidate_page(int type, pgoff_t offset)
|
|
{
|
|
}
|
|
|
|
static inline void arch_swap_invalidate_area(int type)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_SWAP_RESTORE
|
|
static inline void arch_swap_restore(swp_entry_t entry, struct page *page)
|
|
{
|
|
}
|
|
#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
|
|
|
|
/*
|
|
* 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 even if CONFIG_MMU is not defined.
|
|
*/
|
|
|
|
#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
|
|
|
|
#ifdef CONFIG_MMU
|
|
#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
|
|
#endif /* CONFIG_MMU */
|
|
|
|
#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_lock held 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_lock 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_lock 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 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 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 desirable.
|
|
* 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;
|
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int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
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|
unsigned long size, pgprot_t *vma_prot);
|
|
|
|
#ifndef CONFIG_X86_ESPFIX64
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static inline void init_espfix_bsp(void) { }
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|
#endif
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|
|
|
extern void __init pgtable_cache_init(void);
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|
|
|
#ifndef __HAVE_ARCH_PFN_MODIFY_ALLOWED
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|
static inline bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot)
|
|
{
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|
return true;
|
|
}
|
|
|
|
static inline bool arch_has_pfn_modify_check(void)
|
|
{
|
|
return false;
|
|
}
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|
#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
|
|
|
|
#ifndef p4d_offset_lockless
|
|
#define p4d_offset_lockless(pgdp, pgd, address) p4d_offset(&(pgd), address)
|
|
#endif
|
|
#ifndef pud_offset_lockless
|
|
#define pud_offset_lockless(p4dp, p4d, address) pud_offset(&(p4d), address)
|
|
#endif
|
|
#ifndef pmd_offset_lockless
|
|
#define pmd_offset_lockless(pudp, pud, address) pmd_offset(&(pud), address)
|
|
#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 /* _LINUX_PGTABLE_H */
|