forked from Minki/linux
powerpc/mm: move __find_linux_pte() out of hugetlbpage.c
__find_linux_pte() is the only function in hugetlbpage.c which is compiled in regardless on CONFIG_HUGETLBPAGE This patch moves it in pgtable.c. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
Michael Ellerman
parent
3dea7332cc
commit
0caed4de50
@ -756,109 +756,6 @@ void flush_dcache_icache_hugepage(struct page *page)
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#endif /* CONFIG_HUGETLB_PAGE */
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/*
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* We have 4 cases for pgds and pmds:
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* (1) invalid (all zeroes)
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* (2) pointer to next table, as normal; bottom 6 bits == 0
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* (3) leaf pte for huge page _PAGE_PTE set
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* (4) hugepd pointer, _PAGE_PTE = 0 and bits [2..6] indicate size of table
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*
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* So long as we atomically load page table pointers we are safe against teardown,
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* we can follow the address down to the the page and take a ref on it.
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* This function need to be called with interrupts disabled. We use this variant
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* when we have MSR[EE] = 0 but the paca->irq_soft_mask = IRQS_ENABLED
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*/
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pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
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bool *is_thp, unsigned *hpage_shift)
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{
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pgd_t pgd, *pgdp;
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pud_t pud, *pudp;
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pmd_t pmd, *pmdp;
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pte_t *ret_pte;
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hugepd_t *hpdp = NULL;
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unsigned pdshift = PGDIR_SHIFT;
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if (hpage_shift)
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*hpage_shift = 0;
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if (is_thp)
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*is_thp = false;
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pgdp = pgdir + pgd_index(ea);
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pgd = READ_ONCE(*pgdp);
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/*
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* Always operate on the local stack value. This make sure the
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* value don't get updated by a parallel THP split/collapse,
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* page fault or a page unmap. The return pte_t * is still not
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* stable. So should be checked there for above conditions.
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*/
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if (pgd_none(pgd))
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return NULL;
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else if (pgd_huge(pgd)) {
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ret_pte = (pte_t *) pgdp;
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goto out;
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} else if (is_hugepd(__hugepd(pgd_val(pgd))))
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hpdp = (hugepd_t *)&pgd;
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else {
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/*
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* Even if we end up with an unmap, the pgtable will not
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* be freed, because we do an rcu free and here we are
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* irq disabled
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*/
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pdshift = PUD_SHIFT;
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pudp = pud_offset(&pgd, ea);
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pud = READ_ONCE(*pudp);
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if (pud_none(pud))
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return NULL;
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else if (pud_huge(pud)) {
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ret_pte = (pte_t *) pudp;
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goto out;
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} else if (is_hugepd(__hugepd(pud_val(pud))))
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hpdp = (hugepd_t *)&pud;
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else {
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pdshift = PMD_SHIFT;
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pmdp = pmd_offset(&pud, ea);
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pmd = READ_ONCE(*pmdp);
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/*
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* A hugepage collapse is captured by pmd_none, because
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* it mark the pmd none and do a hpte invalidate.
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*/
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if (pmd_none(pmd))
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return NULL;
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if (pmd_trans_huge(pmd) || pmd_devmap(pmd)) {
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if (is_thp)
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*is_thp = true;
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ret_pte = (pte_t *) pmdp;
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goto out;
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}
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/*
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* pmd_large check below will handle the swap pmd pte
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* we need to do both the check because they are config
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* dependent.
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*/
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if (pmd_huge(pmd) || pmd_large(pmd)) {
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ret_pte = (pte_t *) pmdp;
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goto out;
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} else if (is_hugepd(__hugepd(pmd_val(pmd))))
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hpdp = (hugepd_t *)&pmd;
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else
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return pte_offset_kernel(&pmd, ea);
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}
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}
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if (!hpdp)
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return NULL;
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ret_pte = hugepte_offset(*hpdp, ea, pdshift);
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pdshift = hugepd_shift(*hpdp);
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out:
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if (hpage_shift)
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*hpage_shift = pdshift;
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return ret_pte;
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}
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EXPORT_SYMBOL_GPL(__find_linux_pte);
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int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
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unsigned long end, int write, struct page **pages, int *nr)
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{
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@ -30,6 +30,7 @@
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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#include <asm/tlb.h>
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#include <asm/hugetlb.h>
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static inline int is_exec_fault(void)
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{
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@ -299,3 +300,106 @@ unsigned long vmalloc_to_phys(void *va)
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return __pa(pfn_to_kaddr(pfn)) + offset_in_page(va);
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}
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EXPORT_SYMBOL_GPL(vmalloc_to_phys);
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/*
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* We have 4 cases for pgds and pmds:
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* (1) invalid (all zeroes)
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* (2) pointer to next table, as normal; bottom 6 bits == 0
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* (3) leaf pte for huge page _PAGE_PTE set
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* (4) hugepd pointer, _PAGE_PTE = 0 and bits [2..6] indicate size of table
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*
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* So long as we atomically load page table pointers we are safe against teardown,
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* we can follow the address down to the the page and take a ref on it.
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* This function need to be called with interrupts disabled. We use this variant
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* when we have MSR[EE] = 0 but the paca->irq_soft_mask = IRQS_ENABLED
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*/
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pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
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bool *is_thp, unsigned *hpage_shift)
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{
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pgd_t pgd, *pgdp;
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pud_t pud, *pudp;
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pmd_t pmd, *pmdp;
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pte_t *ret_pte;
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hugepd_t *hpdp = NULL;
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unsigned pdshift = PGDIR_SHIFT;
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if (hpage_shift)
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*hpage_shift = 0;
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if (is_thp)
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*is_thp = false;
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pgdp = pgdir + pgd_index(ea);
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pgd = READ_ONCE(*pgdp);
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/*
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* Always operate on the local stack value. This make sure the
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* value don't get updated by a parallel THP split/collapse,
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* page fault or a page unmap. The return pte_t * is still not
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* stable. So should be checked there for above conditions.
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*/
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if (pgd_none(pgd))
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return NULL;
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else if (pgd_huge(pgd)) {
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ret_pte = (pte_t *) pgdp;
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goto out;
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} else if (is_hugepd(__hugepd(pgd_val(pgd))))
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hpdp = (hugepd_t *)&pgd;
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else {
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/*
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* Even if we end up with an unmap, the pgtable will not
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* be freed, because we do an rcu free and here we are
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* irq disabled
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*/
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pdshift = PUD_SHIFT;
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pudp = pud_offset(&pgd, ea);
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pud = READ_ONCE(*pudp);
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if (pud_none(pud))
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return NULL;
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else if (pud_huge(pud)) {
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ret_pte = (pte_t *) pudp;
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goto out;
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} else if (is_hugepd(__hugepd(pud_val(pud))))
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hpdp = (hugepd_t *)&pud;
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else {
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pdshift = PMD_SHIFT;
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pmdp = pmd_offset(&pud, ea);
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pmd = READ_ONCE(*pmdp);
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/*
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* A hugepage collapse is captured by pmd_none, because
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* it mark the pmd none and do a hpte invalidate.
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*/
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if (pmd_none(pmd))
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return NULL;
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if (pmd_trans_huge(pmd) || pmd_devmap(pmd)) {
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if (is_thp)
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*is_thp = true;
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ret_pte = (pte_t *) pmdp;
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goto out;
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}
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/*
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* pmd_large check below will handle the swap pmd pte
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* we need to do both the check because they are config
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* dependent.
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*/
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if (pmd_huge(pmd) || pmd_large(pmd)) {
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ret_pte = (pte_t *) pmdp;
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goto out;
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} else if (is_hugepd(__hugepd(pmd_val(pmd))))
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hpdp = (hugepd_t *)&pmd;
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else
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return pte_offset_kernel(&pmd, ea);
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}
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}
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if (!hpdp)
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return NULL;
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ret_pte = hugepte_offset(*hpdp, ea, pdshift);
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pdshift = hugepd_shift(*hpdp);
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out:
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if (hpage_shift)
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*hpage_shift = pdshift;
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return ret_pte;
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}
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EXPORT_SYMBOL_GPL(__find_linux_pte);
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