/* * set a new huge pmd. We should not be called for updating * an existing pmd entry. That should go via pmd_hugepage_update. */ void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd) { #ifdef CONFIG_DEBUG_VM WARN_ON(pte_present(pmd_pte(*pmdp)) && !pte_protnone(pmd_pte(*pmdp))); assert_spin_locked(&mm->page_table_lock); WARN_ON(!pmd_trans_huge(pmd)); #endif trace_hugepage_set_pmd(addr, pmd_val(pmd)); return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd)); }
/* * nid, region_start, and region_end are hints to try to place the page * table memory in the same node or region. */ static int __map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t flags, unsigned int map_page_size, int nid, unsigned long region_start, unsigned long region_end) { unsigned long pfn = pa >> PAGE_SHIFT; pgd_t *pgdp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; /* * Make sure task size is correct as per the max adddr */ BUILD_BUG_ON(TASK_SIZE_USER64 > RADIX_PGTABLE_RANGE); if (unlikely(!slab_is_available())) return early_map_kernel_page(ea, pa, flags, map_page_size, nid, region_start, region_end); /* * Should make page table allocation functions be able to take a * node, so we can place kernel page tables on the right nodes after * boot. */ pgdp = pgd_offset_k(ea); pudp = pud_alloc(&init_mm, pgdp, ea); if (!pudp) return -ENOMEM; if (map_page_size == PUD_SIZE) { ptep = (pte_t *)pudp; goto set_the_pte; } pmdp = pmd_alloc(&init_mm, pudp, ea); if (!pmdp) return -ENOMEM; if (map_page_size == PMD_SIZE) { ptep = pmdp_ptep(pmdp); goto set_the_pte; } ptep = pte_alloc_kernel(pmdp, ea); if (!ptep) return -ENOMEM; set_the_pte: set_pte_at(&init_mm, ea, ptep, pfn_pte(pfn, flags)); smp_wmb(); return 0; }
/* * set a new huge pmd. We should not be called for updating * an existing pmd entry. That should go via pmd_hugepage_update. */ void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd) { #ifdef CONFIG_DEBUG_VM /* * Make sure hardware valid bit is not set. We don't do * tlb flush for this update. */ WARN_ON(pte_hw_valid(pmd_pte(*pmdp)) && !pte_protnone(pmd_pte(*pmdp))); assert_spin_locked(pmd_lockptr(mm, pmdp)); WARN_ON(!(pmd_large(pmd) || pmd_devmap(pmd))); #endif trace_hugepage_set_pmd(addr, pmd_val(pmd)); return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd)); }
/* * This is called when relaxing access to a hugepage. It's also called in the page * fault path when we don't hit any of the major fault cases, ie, a minor * update of _PAGE_ACCESSED, _PAGE_DIRTY, etc... The generic code will have * handled those two for us, we additionally deal with missing execute * permission here on some processors */ int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp, pmd_t entry, int dirty) { int changed; #ifdef CONFIG_DEBUG_VM WARN_ON(!pmd_trans_huge(*pmdp) && !pmd_devmap(*pmdp)); assert_spin_locked(&vma->vm_mm->page_table_lock); #endif changed = !pmd_same(*(pmdp), entry); if (changed) { __ptep_set_access_flags(vma->vm_mm, pmdp_ptep(pmdp), pmd_pte(entry), address); flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); } return changed; }
static int early_map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t flags, unsigned int map_page_size, int nid, unsigned long region_start, unsigned long region_end) { unsigned long pfn = pa >> PAGE_SHIFT; pgd_t *pgdp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; pgdp = pgd_offset_k(ea); if (pgd_none(*pgdp)) { pudp = early_alloc_pgtable(PUD_TABLE_SIZE, nid, region_start, region_end); pgd_populate(&init_mm, pgdp, pudp); } pudp = pud_offset(pgdp, ea); if (map_page_size == PUD_SIZE) { ptep = (pte_t *)pudp; goto set_the_pte; } if (pud_none(*pudp)) { pmdp = early_alloc_pgtable(PMD_TABLE_SIZE, nid, region_start, region_end); pud_populate(&init_mm, pudp, pmdp); } pmdp = pmd_offset(pudp, ea); if (map_page_size == PMD_SIZE) { ptep = pmdp_ptep(pmdp); goto set_the_pte; } if (!pmd_present(*pmdp)) { ptep = early_alloc_pgtable(PAGE_SIZE, nid, region_start, region_end); pmd_populate_kernel(&init_mm, pmdp, ptep); } ptep = pte_offset_kernel(pmdp, ea); set_the_pte: set_pte_at(&init_mm, ea, ptep, pfn_pte(pfn, flags)); smp_wmb(); return 0; }
/* * This is called when relaxing access to a hugepage. It's also called in the page * fault path when we don't hit any of the major fault cases, ie, a minor * update of _PAGE_ACCESSED, _PAGE_DIRTY, etc... The generic code will have * handled those two for us, we additionally deal with missing execute * permission here on some processors */ int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp, pmd_t entry, int dirty) { int changed; #ifdef CONFIG_DEBUG_VM WARN_ON(!pmd_trans_huge(*pmdp)); assert_spin_locked(&vma->vm_mm->page_table_lock); #endif changed = !pmd_same(*(pmdp), entry); if (changed) { __ptep_set_access_flags(pmdp_ptep(pmdp), pmd_pte(entry)); /* * Since we are not supporting SW TLB systems, we don't * have any thing similar to flush_tlb_page_nohash() */ } return changed; }
/* * This is called when relaxing access to a hugepage. It's also called in the page * fault path when we don't hit any of the major fault cases, ie, a minor * update of _PAGE_ACCESSED, _PAGE_DIRTY, etc... The generic code will have * handled those two for us, we additionally deal with missing execute * permission here on some processors */ int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp, pmd_t entry, int dirty) { int changed; #ifdef CONFIG_DEBUG_VM WARN_ON(!pmd_trans_huge(*pmdp) && !pmd_devmap(*pmdp)); assert_spin_locked(pmd_lockptr(vma->vm_mm, pmdp)); #endif changed = !pmd_same(*(pmdp), entry); if (changed) { /* * We can use MMU_PAGE_2M here, because only radix * path look at the psize. */ __ptep_set_access_flags(vma, pmdp_ptep(pmdp), pmd_pte(entry), address, MMU_PAGE_2M); } return changed; }
void radix__change_memory_range(unsigned long start, unsigned long end, unsigned long clear) { unsigned long idx; pgd_t *pgdp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; start = ALIGN_DOWN(start, PAGE_SIZE); end = PAGE_ALIGN(end); // aligns up pr_debug("Changing flags on range %lx-%lx removing 0x%lx\n", start, end, clear); for (idx = start; idx < end; idx += PAGE_SIZE) { pgdp = pgd_offset_k(idx); pudp = pud_alloc(&init_mm, pgdp, idx); if (!pudp) continue; if (pud_huge(*pudp)) { ptep = (pte_t *)pudp; goto update_the_pte; } pmdp = pmd_alloc(&init_mm, pudp, idx); if (!pmdp) continue; if (pmd_huge(*pmdp)) { ptep = pmdp_ptep(pmdp); goto update_the_pte; } ptep = pte_alloc_kernel(pmdp, idx); if (!ptep) continue; update_the_pte: radix__pte_update(&init_mm, idx, ptep, clear, 0, 0); } radix__flush_tlb_kernel_range(start, end); }