1 // SPDX-License-Identifier: GPL-2.0
3 #include <asm/pgalloc.h>
5 #include <linux/kernel.h>
6 #include <linux/pgtable.h>
8 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
9 int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
14 void p4d_clear_huge(p4d_t *p4d)
18 int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot)
20 pud_t new_pud = pfn_pud(__phys_to_pfn(phys), prot);
22 set_pud(pud, new_pud);
26 int pud_clear_huge(pud_t *pud)
28 if (!pud_leaf(READ_ONCE(*pud)))
34 int pud_free_pmd_page(pud_t *pud, unsigned long addr)
36 pmd_t *pmd = pud_pgtable(*pud);
41 flush_tlb_kernel_range(addr, addr + PUD_SIZE);
43 for (i = 0; i < PTRS_PER_PMD; i++) {
44 if (!pmd_none(pmd[i])) {
45 pte_t *pte = (pte_t *)pmd_page_vaddr(pmd[i]);
47 pte_free_kernel(NULL, pte);
56 int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot)
58 pmd_t new_pmd = pfn_pmd(__phys_to_pfn(phys), prot);
60 set_pmd(pmd, new_pmd);
64 int pmd_clear_huge(pmd_t *pmd)
66 if (!pmd_leaf(READ_ONCE(*pmd)))
72 int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
74 pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd);
78 flush_tlb_kernel_range(addr, addr + PMD_SIZE);
79 pte_free_kernel(NULL, pte);
83 #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
84 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
85 pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
86 unsigned long address, pmd_t *pmdp)
88 pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
90 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
91 VM_BUG_ON(pmd_trans_huge(*pmdp));
93 * When leaf PTE entries (regular pages) are collapsed into a leaf
94 * PMD entry (huge page), a valid non-leaf PTE is converted into a
95 * valid leaf PTE at the level 1 page table. Since the sfence.vma
96 * forms that specify an address only apply to leaf PTEs, we need a
97 * global flush here. collapse_huge_page() assumes these flushes are
98 * eager, so just do the fence here.
100 flush_tlb_mm(vma->vm_mm);
103 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */