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Signed-off-by: Alistair Popple --- include/linux/huge_mm.h | 2 +- mm/huge_memory.c | 165 +----------------------------------------- 2 files changed, 167 deletions(-) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 9207d8e..0fb6bff 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -37,8 +37,6 @@ int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, pgprot_t newprot, unsigned long cp_flags); -vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write); -vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write); vm_fault_t dax_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write); vm_fault_t dax_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write); diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 5191f91..de39af4 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1111,97 +1111,6 @@ vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf) return __do_huge_pmd_anonymous_page(vmf, &folio->page, gfp); } -static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, - pmd_t *pmd, pfn_t pfn, pgprot_t prot, bool write, - pgtable_t pgtable) -{ - struct mm_struct *mm = vma->vm_mm; - pmd_t entry; - spinlock_t *ptl; - - ptl = pmd_lock(mm, pmd); - if (!pmd_none(*pmd)) { - if (write) { - if (pmd_pfn(*pmd) != pfn_t_to_pfn(pfn)) { - WARN_ON_ONCE(!is_huge_zero_pmd(*pmd)); - goto out_unlock; - } - entry = pmd_mkyoung(*pmd); - entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma); - if (pmdp_set_access_flags(vma, addr, pmd, entry, 1)) - update_mmu_cache_pmd(vma, addr, pmd); - } - - goto out_unlock; - } - - entry = pmd_mkhuge(pfn_t_pmd(pfn, prot)); - if (pfn_t_devmap(pfn)) - entry = pmd_mkdevmap(entry); - if (write) { - entry = pmd_mkyoung(pmd_mkdirty(entry)); - entry = maybe_pmd_mkwrite(entry, vma); - } - - if (pgtable) { - pgtable_trans_huge_deposit(mm, pmd, pgtable); - mm_inc_nr_ptes(mm); - pgtable = NULL; - } - - set_pmd_at(mm, addr, pmd, entry); - update_mmu_cache_pmd(vma, addr, pmd); - -out_unlock: - spin_unlock(ptl); - if (pgtable) - pte_free(mm, pgtable); -} - -/** - * vmf_insert_pfn_pmd - insert a pmd size pfn - * @vmf: Structure describing the fault - * @pfn: pfn to insert - * @write: whether it's a write fault - * - * Insert a pmd size pfn. See vmf_insert_pfn() for additional info. - * - * Return: vm_fault_t value. - */ -vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write) -{ - unsigned long addr = vmf->address & PMD_MASK; - struct vm_area_struct *vma = vmf->vma; - pgprot_t pgprot = vma->vm_page_prot; - pgtable_t pgtable = NULL; - - /* - * If we had pmd_special, we could avoid all these restrictions, - * but we need to be consistent with PTEs and architectures that - * can't support a 'special' bit. - */ - BUG_ON(!(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) && - !pfn_t_devmap(pfn)); - BUG_ON((vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) == - (VM_PFNMAP|VM_MIXEDMAP)); - BUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags)); - - if (addr < vma->vm_start || addr >= vma->vm_end) - return VM_FAULT_SIGBUS; - - if (arch_needs_pgtable_deposit()) { - pgtable = pte_alloc_one(vma->vm_mm); - if (!pgtable) - return VM_FAULT_OOM; - } - - track_pfn_insert(vma, &pgprot, pfn); - - insert_pfn_pmd(vma, addr, vmf->pmd, pfn, pgprot, write, pgtable); - return VM_FAULT_NOPAGE; -} -EXPORT_SYMBOL_GPL(vmf_insert_pfn_pmd); - vm_fault_t dax_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write) { struct vm_area_struct *vma = vmf->vma; @@ -1280,80 +1189,6 @@ static pud_t maybe_pud_mkwrite(pud_t pud, struct vm_area_struct *vma) return pud; } -static void insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr, - pud_t *pud, pfn_t pfn, bool write) -{ - struct mm_struct *mm = vma->vm_mm; - pgprot_t prot = vma->vm_page_prot; - pud_t entry; - spinlock_t *ptl; - - ptl = pud_lock(mm, pud); - if (!pud_none(*pud)) { - if (write) { - if (pud_pfn(*pud) != pfn_t_to_pfn(pfn)) { - WARN_ON_ONCE(!is_huge_zero_pud(*pud)); - goto out_unlock; - } - entry = pud_mkyoung(*pud); - entry = maybe_pud_mkwrite(pud_mkdirty(entry), vma); - if (pudp_set_access_flags(vma, addr, pud, entry, 1)) - update_mmu_cache_pud(vma, addr, pud); - } - goto out_unlock; - } - - entry = pud_mkhuge(pfn_t_pud(pfn, prot)); - if (pfn_t_devmap(pfn)) - entry = pud_mkdevmap(entry); - if (write) { - entry = pud_mkyoung(pud_mkdirty(entry)); - entry = maybe_pud_mkwrite(entry, vma); - } - set_pud_at(mm, addr, pud, entry); - update_mmu_cache_pud(vma, addr, pud); - -out_unlock: - spin_unlock(ptl); -} - -/** - * vmf_insert_pfn_pud - insert a pud size pfn - * @vmf: Structure describing the fault - * @pfn: pfn to insert - * @write: whether it's a write fault - * - * Insert a pud size pfn. See vmf_insert_pfn() for additional info. - * - * Return: vm_fault_t value. - */ -vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write) -{ - unsigned long addr = vmf->address & PUD_MASK; - struct vm_area_struct *vma = vmf->vma; - pgprot_t pgprot = vma->vm_page_prot; - - /* - * If we had pud_special, we could avoid all these restrictions, - * but we need to be consistent with PTEs and architectures that - * can't support a 'special' bit. - */ - BUG_ON(!(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) && - !pfn_t_devmap(pfn)); - BUG_ON((vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) == - (VM_PFNMAP|VM_MIXEDMAP)); - BUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags)); - - if (addr < vma->vm_start || addr >= vma->vm_end) - return VM_FAULT_SIGBUS; - - track_pfn_insert(vma, &pgprot, pfn); - - insert_pfn_pud(vma, addr, vmf->pud, pfn, write); - return VM_FAULT_NOPAGE; -} -EXPORT_SYMBOL_GPL(vmf_insert_pfn_pud); - /** * dax_insert_pfn_pud - insert a pud size pfn backed by a normal page * @vmf: Structure describing the fault