forked from luck/tmp_suning_uos_patched
394158559d
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>
266 lines
6.6 KiB
C
266 lines
6.6 KiB
C
#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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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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paravirt_release_pt(page_to_pfn(pte));
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tlb_remove_page(tlb, pte);
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}
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#if PAGETABLE_LEVELS > 2
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void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
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{
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paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT);
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tlb_remove_page(tlb, virt_to_page(pmd));
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}
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#if PAGETABLE_LEVELS > 3
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void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
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{
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tlb_remove_page(tlb, virt_to_page(pud));
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}
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#endif /* PAGETABLE_LEVELS > 3 */
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#endif /* PAGETABLE_LEVELS > 2 */
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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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#ifdef CONFIG_X86_64
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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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unsigned long flags;
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if (!pgd)
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return NULL;
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spin_lock_irqsave(&pgd_lock, flags);
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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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* 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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unsigned long flags;
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BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
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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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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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#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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void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
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{
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paravirt_alloc_pd(mm, __pa(pmd) >> PAGE_SHIFT);
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/* Note: almost everything apart from _PAGE_PRESENT is
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reserved at the pmd (PDPT) level. */
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set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT));
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/*
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* According to Intel App note "TLBs, Paging-Structure Caches,
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* and Their Invalidation", April 2007, document 317080-001,
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* section 8.1: in PAE mode we explicitly have to flush the
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* TLB via cr3 if the top-level pgd is changed...
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*/
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if (mm == current->active_mm)
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write_cr3(read_cr3());
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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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