x86: add common mm/pgtable.c
Add a common arch/x86/mm/pgtable.c file for common pagetable functions. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jeremy Fitzhardinge
Ingo Molnar
parent
79bf6d66ab
commit
4f76cd3822
6 changed files with 258 additions and 266 deletions
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@ -1,5 +1,5 @@
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obj-y := init_$(BITS).o fault.o ioremap.o extable.o pageattr.o mmap.o \
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pat.o
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pat.o pgtable.o
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obj-$(CONFIG_X86_32) += pgtable_32.o
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239
arch/x86/mm/pgtable.c
Normal file
239
arch/x86/mm/pgtable.c
Normal file
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@ -0,0 +1,239 @@
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#include <linux/mm.h>
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#include <asm/pgalloc.h>
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#include <asm/tlb.h>
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pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
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{
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return (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
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}
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pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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struct page *pte;
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#ifdef CONFIG_HIGHPTE
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pte = alloc_pages(GFP_KERNEL|__GFP_HIGHMEM|__GFP_REPEAT|__GFP_ZERO, 0);
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#else
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pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
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#endif
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if (pte)
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pgtable_page_ctor(pte);
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return pte;
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}
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#ifdef CONFIG_X86_64
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static inline void pgd_list_add(pgd_t *pgd)
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{
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struct page *page = virt_to_page(pgd);
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unsigned long flags;
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spin_lock_irqsave(&pgd_lock, flags);
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list_add(&page->lru, &pgd_list);
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spin_unlock_irqrestore(&pgd_lock, flags);
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}
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static inline void pgd_list_del(pgd_t *pgd)
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{
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struct page *page = virt_to_page(pgd);
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unsigned long flags;
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spin_lock_irqsave(&pgd_lock, flags);
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list_del(&page->lru);
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spin_unlock_irqrestore(&pgd_lock, flags);
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}
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pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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unsigned boundary;
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pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
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if (!pgd)
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return NULL;
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pgd_list_add(pgd);
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/*
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* Copy kernel pointers in from init.
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* Could keep a freelist or slab cache of those because the kernel
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* part never changes.
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*/
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boundary = pgd_index(__PAGE_OFFSET);
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memset(pgd, 0, boundary * sizeof(pgd_t));
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memcpy(pgd + boundary,
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init_level4_pgt + boundary,
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(PTRS_PER_PGD - boundary) * sizeof(pgd_t));
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return pgd;
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}
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void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
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pgd_list_del(pgd);
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free_page((unsigned long)pgd);
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}
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#else
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/*
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* List of all pgd's needed for non-PAE so it can invalidate entries
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* in both cached and uncached pgd's; not needed for PAE since the
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* kernel pmd is shared. If PAE were not to share the pmd a similar
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* tactic would be needed. This is essentially codepath-based locking
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* against pageattr.c; it is the unique case in which a valid change
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* of kernel pagetables can't be lazily synchronized by vmalloc faults.
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* vmalloc faults work because attached pagetables are never freed.
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* -- wli
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*/
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static inline void pgd_list_add(pgd_t *pgd)
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{
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struct page *page = virt_to_page(pgd);
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list_add(&page->lru, &pgd_list);
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}
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static inline void pgd_list_del(pgd_t *pgd)
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{
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struct page *page = virt_to_page(pgd);
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list_del(&page->lru);
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}
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#define UNSHARED_PTRS_PER_PGD \
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(SHARED_KERNEL_PMD ? USER_PTRS_PER_PGD : PTRS_PER_PGD)
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static void pgd_ctor(void *p)
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{
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pgd_t *pgd = p;
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unsigned long flags;
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/* Clear usermode parts of PGD */
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memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t));
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spin_lock_irqsave(&pgd_lock, flags);
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/* If the pgd points to a shared pagetable level (either the
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ptes in non-PAE, or shared PMD in PAE), then just copy the
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references from swapper_pg_dir. */
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if (PAGETABLE_LEVELS == 2 ||
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(PAGETABLE_LEVELS == 3 && SHARED_KERNEL_PMD)) {
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clone_pgd_range(pgd + USER_PTRS_PER_PGD,
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swapper_pg_dir + USER_PTRS_PER_PGD,
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KERNEL_PGD_PTRS);
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paravirt_alloc_pd_clone(__pa(pgd) >> PAGE_SHIFT,
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__pa(swapper_pg_dir) >> PAGE_SHIFT,
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USER_PTRS_PER_PGD,
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KERNEL_PGD_PTRS);
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}
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/* list required to sync kernel mapping updates */
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if (!SHARED_KERNEL_PMD)
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pgd_list_add(pgd);
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spin_unlock_irqrestore(&pgd_lock, flags);
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}
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static void pgd_dtor(void *pgd)
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{
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unsigned long flags; /* can be called from interrupt context */
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if (SHARED_KERNEL_PMD)
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return;
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spin_lock_irqsave(&pgd_lock, flags);
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pgd_list_del(pgd);
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spin_unlock_irqrestore(&pgd_lock, flags);
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}
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#ifdef CONFIG_X86_PAE
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/*
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* Mop up any pmd pages which may still be attached to the pgd.
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* Normally they will be freed by munmap/exit_mmap, but any pmd we
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* preallocate which never got a corresponding vma will need to be
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* freed manually.
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*/
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static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)
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{
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int i;
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for(i = 0; i < UNSHARED_PTRS_PER_PGD; i++) {
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pgd_t pgd = pgdp[i];
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if (pgd_val(pgd) != 0) {
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pmd_t *pmd = (pmd_t *)pgd_page_vaddr(pgd);
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pgdp[i] = native_make_pgd(0);
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paravirt_release_pd(pgd_val(pgd) >> PAGE_SHIFT);
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pmd_free(mm, pmd);
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}
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}
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}
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/*
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* In PAE mode, we need to do a cr3 reload (=tlb flush) when
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* updating the top-level pagetable entries to guarantee the
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* processor notices the update. Since this is expensive, and
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* all 4 top-level entries are used almost immediately in a
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* new process's life, we just pre-populate them here.
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*
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* Also, if we're in a paravirt environment where the kernel pmd is
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* not shared between pagetables (!SHARED_KERNEL_PMDS), we allocate
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* and initialize the kernel pmds here.
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*/
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static int pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd)
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{
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pud_t *pud;
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unsigned long addr;
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int i;
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pud = pud_offset(pgd, 0);
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for (addr = i = 0; i < UNSHARED_PTRS_PER_PGD;
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i++, pud++, addr += PUD_SIZE) {
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pmd_t *pmd = pmd_alloc_one(mm, addr);
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if (!pmd) {
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pgd_mop_up_pmds(mm, pgd);
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return 0;
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}
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if (i >= USER_PTRS_PER_PGD)
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memcpy(pmd, (pmd_t *)pgd_page_vaddr(swapper_pg_dir[i]),
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sizeof(pmd_t) * PTRS_PER_PMD);
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pud_populate(mm, pud, pmd);
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}
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return 1;
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}
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#else /* !CONFIG_X86_PAE */
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/* No need to prepopulate any pagetable entries in non-PAE modes. */
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static int pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd)
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{
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return 1;
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}
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static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgd)
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{
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}
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#endif /* CONFIG_X86_PAE */
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pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
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/* so that alloc_pd can use it */
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mm->pgd = pgd;
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if (pgd)
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pgd_ctor(pgd);
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if (pgd && !pgd_prepopulate_pmd(mm, pgd)) {
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pgd_dtor(pgd);
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free_page((unsigned long)pgd);
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pgd = NULL;
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}
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return pgd;
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}
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void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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pgd_mop_up_pmds(mm, pgd);
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pgd_dtor(pgd);
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free_page((unsigned long)pgd);
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}
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#endif
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@ -173,193 +173,6 @@ void reserve_top_address(unsigned long reserve)
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__VMALLOC_RESERVE += reserve;
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}
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pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
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{
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return (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
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}
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pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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struct page *pte;
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#ifdef CONFIG_HIGHPTE
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pte = alloc_pages(GFP_KERNEL|__GFP_HIGHMEM|__GFP_REPEAT|__GFP_ZERO, 0);
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#else
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pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
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#endif
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if (pte)
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pgtable_page_ctor(pte);
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return pte;
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}
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/*
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* List of all pgd's needed for non-PAE so it can invalidate entries
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* in both cached and uncached pgd's; not needed for PAE since the
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* kernel pmd is shared. If PAE were not to share the pmd a similar
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* tactic would be needed. This is essentially codepath-based locking
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* against pageattr.c; it is the unique case in which a valid change
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* of kernel pagetables can't be lazily synchronized by vmalloc faults.
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* vmalloc faults work because attached pagetables are never freed.
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* -- wli
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*/
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static inline void pgd_list_add(pgd_t *pgd)
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{
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struct page *page = virt_to_page(pgd);
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list_add(&page->lru, &pgd_list);
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}
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static inline void pgd_list_del(pgd_t *pgd)
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{
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struct page *page = virt_to_page(pgd);
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list_del(&page->lru);
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}
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#define UNSHARED_PTRS_PER_PGD \
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(SHARED_KERNEL_PMD ? USER_PTRS_PER_PGD : PTRS_PER_PGD)
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static void pgd_ctor(void *p)
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{
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pgd_t *pgd = p;
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unsigned long flags;
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/* Clear usermode parts of PGD */
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memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t));
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spin_lock_irqsave(&pgd_lock, flags);
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/* If the pgd points to a shared pagetable level (either the
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ptes in non-PAE, or shared PMD in PAE), then just copy the
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references from swapper_pg_dir. */
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if (PAGETABLE_LEVELS == 2 ||
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(PAGETABLE_LEVELS == 3 && SHARED_KERNEL_PMD)) {
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clone_pgd_range(pgd + USER_PTRS_PER_PGD,
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swapper_pg_dir + USER_PTRS_PER_PGD,
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KERNEL_PGD_PTRS);
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paravirt_alloc_pd_clone(__pa(pgd) >> PAGE_SHIFT,
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__pa(swapper_pg_dir) >> PAGE_SHIFT,
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USER_PTRS_PER_PGD,
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KERNEL_PGD_PTRS);
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}
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/* list required to sync kernel mapping updates */
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if (!SHARED_KERNEL_PMD)
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pgd_list_add(pgd);
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spin_unlock_irqrestore(&pgd_lock, flags);
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}
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static void pgd_dtor(void *pgd)
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{
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unsigned long flags; /* can be called from interrupt context */
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if (SHARED_KERNEL_PMD)
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return;
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spin_lock_irqsave(&pgd_lock, flags);
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pgd_list_del(pgd);
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spin_unlock_irqrestore(&pgd_lock, flags);
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}
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#ifdef CONFIG_X86_PAE
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/*
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* Mop up any pmd pages which may still be attached to the pgd.
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* Normally they will be freed by munmap/exit_mmap, but any pmd we
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* preallocate which never got a corresponding vma will need to be
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* freed manually.
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*/
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static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)
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{
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int i;
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for(i = 0; i < UNSHARED_PTRS_PER_PGD; i++) {
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pgd_t pgd = pgdp[i];
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if (pgd_val(pgd) != 0) {
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pmd_t *pmd = (pmd_t *)pgd_page_vaddr(pgd);
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pgdp[i] = native_make_pgd(0);
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paravirt_release_pd(pgd_val(pgd) >> PAGE_SHIFT);
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pmd_free(mm, pmd);
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}
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}
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}
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/*
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* In PAE mode, we need to do a cr3 reload (=tlb flush) when
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* updating the top-level pagetable entries to guarantee the
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* processor notices the update. Since this is expensive, and
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* all 4 top-level entries are used almost immediately in a
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* new process's life, we just pre-populate them here.
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*
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* Also, if we're in a paravirt environment where the kernel pmd is
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* not shared between pagetables (!SHARED_KERNEL_PMDS), we allocate
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* and initialize the kernel pmds here.
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*/
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static int pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd)
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{
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pud_t *pud;
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unsigned long addr;
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int i;
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pud = pud_offset(pgd, 0);
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for (addr = i = 0; i < UNSHARED_PTRS_PER_PGD;
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i++, pud++, addr += PUD_SIZE) {
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pmd_t *pmd = pmd_alloc_one(mm, addr);
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if (!pmd) {
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pgd_mop_up_pmds(mm, pgd);
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return 0;
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}
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if (i >= USER_PTRS_PER_PGD)
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memcpy(pmd, (pmd_t *)pgd_page_vaddr(swapper_pg_dir[i]),
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sizeof(pmd_t) * PTRS_PER_PMD);
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pud_populate(mm, pud, pmd);
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}
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return 1;
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}
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#else /* !CONFIG_X86_PAE */
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/* No need to prepopulate any pagetable entries in non-PAE modes. */
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static int pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd)
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{
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return 1;
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}
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static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)
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{
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}
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#endif /* CONFIG_X86_PAE */
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pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
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/* so that alloc_pd can use it */
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mm->pgd = pgd;
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if (pgd)
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pgd_ctor(pgd);
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if (pgd && !pgd_prepopulate_pmd(mm, pgd)) {
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pgd_dtor(pgd);
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free_page((unsigned long)pgd);
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pgd = NULL;
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}
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return pgd;
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}
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void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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pgd_mop_up_pmds(mm, pgd);
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pgd_dtor(pgd);
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free_page((unsigned long)pgd);
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}
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void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
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{
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pgtable_page_dtor(pte);
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@ -1,5 +1,23 @@
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#ifndef _ASM_X86_PGALLOC_H
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#define _ASM_X86_PGALLOC_H
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#include <linux/threads.h>
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#include <linux/mm.h> /* for struct page */
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#include <linux/pagemap.h>
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/*
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* Allocate and free page tables.
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*/
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extern pgd_t *pgd_alloc(struct mm_struct *);
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extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
|
||||
|
||||
extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
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||||
extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
# include "pgalloc_32.h"
|
||||
#else
|
||||
# include "pgalloc_64.h"
|
||||
#endif
|
||||
|
||||
#endif /* _ASM_X86_PGALLOC_H */
|
||||
|
|
|
|||
|
|
@ -1,12 +1,6 @@
|
|||
#ifndef _I386_PGALLOC_H
|
||||
#define _I386_PGALLOC_H
|
||||
|
||||
#include <linux/threads.h>
|
||||
#include <linux/mm.h> /* for struct page */
|
||||
#include <linux/pagemap.h>
|
||||
#include <asm/tlb.h>
|
||||
#include <asm-generic/tlb.h>
|
||||
|
||||
#ifdef CONFIG_PARAVIRT
|
||||
#include <asm/paravirt.h>
|
||||
#else
|
||||
|
|
@ -36,11 +30,6 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *p
|
|||
/*
|
||||
* Allocate and free page tables.
|
||||
*/
|
||||
extern pgd_t *pgd_alloc(struct mm_struct *);
|
||||
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
|
||||
|
||||
extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
|
||||
extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
|
||||
|
||||
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -1,8 +1,6 @@
|
|||
#ifndef _X86_64_PGALLOC_H
|
||||
#define _X86_64_PGALLOC_H
|
||||
|
||||
#include <linux/threads.h>
|
||||
#include <linux/mm.h>
|
||||
#include <asm/pda.h>
|
||||
|
||||
static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
|
||||
|
|
@ -49,71 +47,6 @@ static inline void pud_free(struct mm_struct *mm, pud_t *pud)
|
|||
free_page((unsigned long)pud);
|
||||
}
|
||||
|
||||
static inline void pgd_list_add(pgd_t *pgd)
|
||||
{
|
||||
struct page *page = virt_to_page(pgd);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&pgd_lock, flags);
|
||||
list_add(&page->lru, &pgd_list);
|
||||
spin_unlock_irqrestore(&pgd_lock, flags);
|
||||
}
|
||||
|
||||
static inline void pgd_list_del(pgd_t *pgd)
|
||||
{
|
||||
struct page *page = virt_to_page(pgd);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&pgd_lock, flags);
|
||||
list_del(&page->lru);
|
||||
spin_unlock_irqrestore(&pgd_lock, flags);
|
||||
}
|
||||
|
||||
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
|
||||
{
|
||||
unsigned boundary;
|
||||
pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
|
||||
if (!pgd)
|
||||
return NULL;
|
||||
pgd_list_add(pgd);
|
||||
/*
|
||||
* Copy kernel pointers in from init.
|
||||
* Could keep a freelist or slab cache of those because the kernel
|
||||
* part never changes.
|
||||
*/
|
||||
boundary = pgd_index(__PAGE_OFFSET);
|
||||
memset(pgd, 0, boundary * sizeof(pgd_t));
|
||||
memcpy(pgd + boundary,
|
||||
init_level4_pgt + boundary,
|
||||
(PTRS_PER_PGD - boundary) * sizeof(pgd_t));
|
||||
return pgd;
|
||||
}
|
||||
|
||||
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
|
||||
{
|
||||
BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
|
||||
pgd_list_del(pgd);
|
||||
free_page((unsigned long)pgd);
|
||||
}
|
||||
|
||||
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
|
||||
{
|
||||
return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
|
||||
}
|
||||
|
||||
static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
|
||||
{
|
||||
struct page *page;
|
||||
void *p;
|
||||
|
||||
p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
|
||||
if (!p)
|
||||
return NULL;
|
||||
page = virt_to_page(p);
|
||||
pgtable_page_ctor(page);
|
||||
return page;
|
||||
}
|
||||
|
||||
/* Should really implement gc for free page table pages. This could be
|
||||
done with a reference count in struct page. */
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue