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683 lines
17 KiB
683 lines
17 KiB
/* |
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* PPC Huge TLB Page Support for Kernel. |
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* |
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* Copyright (C) 2003 David Gibson, IBM Corporation. |
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* Copyright (C) 2011 Becky Bruce, Freescale Semiconductor |
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* |
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* Based on the IA-32 version: |
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* Copyright (C) 2002, Rohit Seth <[email protected]> |
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*/ |
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|
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#include <linux/mm.h> |
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#include <linux/io.h> |
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#include <linux/slab.h> |
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#include <linux/hugetlb.h> |
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#include <linux/export.h> |
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#include <linux/of_fdt.h> |
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#include <linux/memblock.h> |
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#include <linux/moduleparam.h> |
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#include <linux/swap.h> |
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#include <linux/swapops.h> |
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#include <linux/kmemleak.h> |
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#include <asm/pgalloc.h> |
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#include <asm/tlb.h> |
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#include <asm/setup.h> |
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#include <asm/hugetlb.h> |
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#include <asm/pte-walk.h> |
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|
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bool hugetlb_disabled = false; |
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|
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#define hugepd_none(hpd) (hpd_val(hpd) == 0) |
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|
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#define PTE_T_ORDER (__builtin_ffs(sizeof(pte_basic_t)) - \ |
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__builtin_ffs(sizeof(void *))) |
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|
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pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, unsigned long sz) |
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{ |
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/* |
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* Only called for hugetlbfs pages, hence can ignore THP and the |
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* irq disabled walk. |
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*/ |
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return __find_linux_pte(mm->pgd, addr, NULL, NULL); |
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} |
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static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp, |
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unsigned long address, unsigned int pdshift, |
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unsigned int pshift, spinlock_t *ptl) |
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{ |
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struct kmem_cache *cachep; |
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pte_t *new; |
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int i; |
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int num_hugepd; |
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if (pshift >= pdshift) { |
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cachep = PGT_CACHE(PTE_T_ORDER); |
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num_hugepd = 1 << (pshift - pdshift); |
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} else { |
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cachep = PGT_CACHE(pdshift - pshift); |
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num_hugepd = 1; |
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} |
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|
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if (!cachep) { |
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WARN_ONCE(1, "No page table cache created for hugetlb tables"); |
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return -ENOMEM; |
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} |
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new = kmem_cache_alloc(cachep, pgtable_gfp_flags(mm, GFP_KERNEL)); |
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BUG_ON(pshift > HUGEPD_SHIFT_MASK); |
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BUG_ON((unsigned long)new & HUGEPD_SHIFT_MASK); |
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if (!new) |
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return -ENOMEM; |
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/* |
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* Make sure other cpus find the hugepd set only after a |
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* properly initialized page table is visible to them. |
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* For more details look for comment in __pte_alloc(). |
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*/ |
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smp_wmb(); |
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spin_lock(ptl); |
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/* |
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* We have multiple higher-level entries that point to the same |
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* actual pte location. Fill in each as we go and backtrack on error. |
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* We need all of these so the DTLB pgtable walk code can find the |
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* right higher-level entry without knowing if it's a hugepage or not. |
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*/ |
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for (i = 0; i < num_hugepd; i++, hpdp++) { |
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if (unlikely(!hugepd_none(*hpdp))) |
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break; |
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hugepd_populate(hpdp, new, pshift); |
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} |
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/* If we bailed from the for loop early, an error occurred, clean up */ |
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if (i < num_hugepd) { |
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for (i = i - 1 ; i >= 0; i--, hpdp--) |
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*hpdp = __hugepd(0); |
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kmem_cache_free(cachep, new); |
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} else { |
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kmemleak_ignore(new); |
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} |
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spin_unlock(ptl); |
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return 0; |
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} |
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/* |
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* At this point we do the placement change only for BOOK3S 64. This would |
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* possibly work on other subarchs. |
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*/ |
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pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, |
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unsigned long addr, unsigned long sz) |
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{ |
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pgd_t *pg; |
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p4d_t *p4; |
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pud_t *pu; |
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pmd_t *pm; |
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hugepd_t *hpdp = NULL; |
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unsigned pshift = __ffs(sz); |
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unsigned pdshift = PGDIR_SHIFT; |
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spinlock_t *ptl; |
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addr &= ~(sz-1); |
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pg = pgd_offset(mm, addr); |
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p4 = p4d_offset(pg, addr); |
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#ifdef CONFIG_PPC_BOOK3S_64 |
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if (pshift == PGDIR_SHIFT) |
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/* 16GB huge page */ |
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return (pte_t *) p4; |
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else if (pshift > PUD_SHIFT) { |
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/* |
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* We need to use hugepd table |
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*/ |
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ptl = &mm->page_table_lock; |
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hpdp = (hugepd_t *)p4; |
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} else { |
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pdshift = PUD_SHIFT; |
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pu = pud_alloc(mm, p4, addr); |
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if (!pu) |
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return NULL; |
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if (pshift == PUD_SHIFT) |
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return (pte_t *)pu; |
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else if (pshift > PMD_SHIFT) { |
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ptl = pud_lockptr(mm, pu); |
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hpdp = (hugepd_t *)pu; |
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} else { |
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pdshift = PMD_SHIFT; |
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pm = pmd_alloc(mm, pu, addr); |
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if (!pm) |
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return NULL; |
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if (pshift == PMD_SHIFT) |
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/* 16MB hugepage */ |
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return (pte_t *)pm; |
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else { |
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ptl = pmd_lockptr(mm, pm); |
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hpdp = (hugepd_t *)pm; |
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} |
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} |
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} |
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#else |
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if (pshift >= PGDIR_SHIFT) { |
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ptl = &mm->page_table_lock; |
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hpdp = (hugepd_t *)p4; |
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} else { |
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pdshift = PUD_SHIFT; |
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pu = pud_alloc(mm, p4, addr); |
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if (!pu) |
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return NULL; |
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if (pshift >= PUD_SHIFT) { |
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ptl = pud_lockptr(mm, pu); |
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hpdp = (hugepd_t *)pu; |
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} else { |
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pdshift = PMD_SHIFT; |
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pm = pmd_alloc(mm, pu, addr); |
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if (!pm) |
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return NULL; |
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ptl = pmd_lockptr(mm, pm); |
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hpdp = (hugepd_t *)pm; |
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} |
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} |
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#endif |
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if (!hpdp) |
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return NULL; |
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if (IS_ENABLED(CONFIG_PPC_8xx) && pshift < PMD_SHIFT) |
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return pte_alloc_map(mm, (pmd_t *)hpdp, addr); |
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BUG_ON(!hugepd_none(*hpdp) && !hugepd_ok(*hpdp)); |
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if (hugepd_none(*hpdp) && __hugepte_alloc(mm, hpdp, addr, |
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pdshift, pshift, ptl)) |
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return NULL; |
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return hugepte_offset(*hpdp, addr, pdshift); |
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} |
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#ifdef CONFIG_PPC_BOOK3S_64 |
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/* |
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* Tracks gpages after the device tree is scanned and before the |
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* huge_boot_pages list is ready on pseries. |
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*/ |
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#define MAX_NUMBER_GPAGES 1024 |
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__initdata static u64 gpage_freearray[MAX_NUMBER_GPAGES]; |
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__initdata static unsigned nr_gpages; |
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/* |
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* Build list of addresses of gigantic pages. This function is used in early |
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* boot before the buddy allocator is setup. |
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*/ |
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void __init pseries_add_gpage(u64 addr, u64 page_size, unsigned long number_of_pages) |
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{ |
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if (!addr) |
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return; |
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while (number_of_pages > 0) { |
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gpage_freearray[nr_gpages] = addr; |
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nr_gpages++; |
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number_of_pages--; |
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addr += page_size; |
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} |
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} |
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static int __init pseries_alloc_bootmem_huge_page(struct hstate *hstate) |
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{ |
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struct huge_bootmem_page *m; |
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if (nr_gpages == 0) |
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return 0; |
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m = phys_to_virt(gpage_freearray[--nr_gpages]); |
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gpage_freearray[nr_gpages] = 0; |
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list_add(&m->list, &huge_boot_pages); |
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m->hstate = hstate; |
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return 1; |
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} |
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#endif |
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int __init alloc_bootmem_huge_page(struct hstate *h) |
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{ |
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#ifdef CONFIG_PPC_BOOK3S_64 |
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if (firmware_has_feature(FW_FEATURE_LPAR) && !radix_enabled()) |
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return pseries_alloc_bootmem_huge_page(h); |
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#endif |
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return __alloc_bootmem_huge_page(h); |
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} |
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#ifndef CONFIG_PPC_BOOK3S_64 |
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#define HUGEPD_FREELIST_SIZE \ |
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((PAGE_SIZE - sizeof(struct hugepd_freelist)) / sizeof(pte_t)) |
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struct hugepd_freelist { |
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struct rcu_head rcu; |
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unsigned int index; |
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void *ptes[]; |
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}; |
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static DEFINE_PER_CPU(struct hugepd_freelist *, hugepd_freelist_cur); |
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static void hugepd_free_rcu_callback(struct rcu_head *head) |
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{ |
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struct hugepd_freelist *batch = |
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container_of(head, struct hugepd_freelist, rcu); |
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unsigned int i; |
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for (i = 0; i < batch->index; i++) |
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kmem_cache_free(PGT_CACHE(PTE_T_ORDER), batch->ptes[i]); |
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free_page((unsigned long)batch); |
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} |
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static void hugepd_free(struct mmu_gather *tlb, void *hugepte) |
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{ |
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struct hugepd_freelist **batchp; |
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batchp = &get_cpu_var(hugepd_freelist_cur); |
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if (atomic_read(&tlb->mm->mm_users) < 2 || |
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mm_is_thread_local(tlb->mm)) { |
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kmem_cache_free(PGT_CACHE(PTE_T_ORDER), hugepte); |
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put_cpu_var(hugepd_freelist_cur); |
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return; |
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} |
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if (*batchp == NULL) { |
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*batchp = (struct hugepd_freelist *)__get_free_page(GFP_ATOMIC); |
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(*batchp)->index = 0; |
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} |
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(*batchp)->ptes[(*batchp)->index++] = hugepte; |
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if ((*batchp)->index == HUGEPD_FREELIST_SIZE) { |
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call_rcu(&(*batchp)->rcu, hugepd_free_rcu_callback); |
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*batchp = NULL; |
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} |
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put_cpu_var(hugepd_freelist_cur); |
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} |
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#else |
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static inline void hugepd_free(struct mmu_gather *tlb, void *hugepte) {} |
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#endif |
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/* Return true when the entry to be freed maps more than the area being freed */ |
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static bool range_is_outside_limits(unsigned long start, unsigned long end, |
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unsigned long floor, unsigned long ceiling, |
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unsigned long mask) |
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{ |
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if ((start & mask) < floor) |
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return true; |
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if (ceiling) { |
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ceiling &= mask; |
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if (!ceiling) |
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return true; |
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} |
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return end - 1 > ceiling - 1; |
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} |
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static void free_hugepd_range(struct mmu_gather *tlb, hugepd_t *hpdp, int pdshift, |
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unsigned long start, unsigned long end, |
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unsigned long floor, unsigned long ceiling) |
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{ |
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pte_t *hugepte = hugepd_page(*hpdp); |
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int i; |
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unsigned long pdmask = ~((1UL << pdshift) - 1); |
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unsigned int num_hugepd = 1; |
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unsigned int shift = hugepd_shift(*hpdp); |
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/* Note: On fsl the hpdp may be the first of several */ |
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if (shift > pdshift) |
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num_hugepd = 1 << (shift - pdshift); |
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if (range_is_outside_limits(start, end, floor, ceiling, pdmask)) |
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return; |
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for (i = 0; i < num_hugepd; i++, hpdp++) |
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*hpdp = __hugepd(0); |
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if (shift >= pdshift) |
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hugepd_free(tlb, hugepte); |
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else |
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pgtable_free_tlb(tlb, hugepte, |
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get_hugepd_cache_index(pdshift - shift)); |
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} |
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static void hugetlb_free_pte_range(struct mmu_gather *tlb, pmd_t *pmd, |
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unsigned long addr, unsigned long end, |
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unsigned long floor, unsigned long ceiling) |
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{ |
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pgtable_t token = pmd_pgtable(*pmd); |
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if (range_is_outside_limits(addr, end, floor, ceiling, PMD_MASK)) |
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return; |
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pmd_clear(pmd); |
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pte_free_tlb(tlb, token, addr); |
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mm_dec_nr_ptes(tlb->mm); |
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} |
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static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud, |
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unsigned long addr, unsigned long end, |
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unsigned long floor, unsigned long ceiling) |
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{ |
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pmd_t *pmd; |
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unsigned long next; |
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unsigned long start; |
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start = addr; |
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do { |
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unsigned long more; |
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pmd = pmd_offset(pud, addr); |
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next = pmd_addr_end(addr, end); |
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if (!is_hugepd(__hugepd(pmd_val(*pmd)))) { |
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if (pmd_none_or_clear_bad(pmd)) |
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continue; |
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|
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/* |
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* if it is not hugepd pointer, we should already find |
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* it cleared. |
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*/ |
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WARN_ON(!IS_ENABLED(CONFIG_PPC_8xx)); |
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hugetlb_free_pte_range(tlb, pmd, addr, end, floor, ceiling); |
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|
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continue; |
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} |
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/* |
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* Increment next by the size of the huge mapping since |
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* there may be more than one entry at this level for a |
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* single hugepage, but all of them point to |
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* the same kmem cache that holds the hugepte. |
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*/ |
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more = addr + (1 << hugepd_shift(*(hugepd_t *)pmd)); |
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if (more > next) |
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next = more; |
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free_hugepd_range(tlb, (hugepd_t *)pmd, PMD_SHIFT, |
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addr, next, floor, ceiling); |
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} while (addr = next, addr != end); |
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if (range_is_outside_limits(start, end, floor, ceiling, PUD_MASK)) |
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return; |
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pmd = pmd_offset(pud, start & PUD_MASK); |
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pud_clear(pud); |
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pmd_free_tlb(tlb, pmd, start & PUD_MASK); |
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mm_dec_nr_pmds(tlb->mm); |
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} |
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static void hugetlb_free_pud_range(struct mmu_gather *tlb, p4d_t *p4d, |
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unsigned long addr, unsigned long end, |
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unsigned long floor, unsigned long ceiling) |
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{ |
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pud_t *pud; |
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unsigned long next; |
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unsigned long start; |
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start = addr; |
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do { |
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pud = pud_offset(p4d, addr); |
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next = pud_addr_end(addr, end); |
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if (!is_hugepd(__hugepd(pud_val(*pud)))) { |
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if (pud_none_or_clear_bad(pud)) |
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continue; |
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hugetlb_free_pmd_range(tlb, pud, addr, next, floor, |
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ceiling); |
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} else { |
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unsigned long more; |
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/* |
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* Increment next by the size of the huge mapping since |
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* there may be more than one entry at this level for a |
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* single hugepage, but all of them point to |
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* the same kmem cache that holds the hugepte. |
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*/ |
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more = addr + (1 << hugepd_shift(*(hugepd_t *)pud)); |
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if (more > next) |
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next = more; |
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free_hugepd_range(tlb, (hugepd_t *)pud, PUD_SHIFT, |
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addr, next, floor, ceiling); |
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} |
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} while (addr = next, addr != end); |
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if (range_is_outside_limits(start, end, floor, ceiling, PGDIR_MASK)) |
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return; |
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pud = pud_offset(p4d, start & PGDIR_MASK); |
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p4d_clear(p4d); |
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pud_free_tlb(tlb, pud, start & PGDIR_MASK); |
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mm_dec_nr_puds(tlb->mm); |
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} |
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/* |
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* This function frees user-level page tables of a process. |
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*/ |
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void hugetlb_free_pgd_range(struct mmu_gather *tlb, |
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unsigned long addr, unsigned long end, |
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unsigned long floor, unsigned long ceiling) |
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{ |
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pgd_t *pgd; |
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p4d_t *p4d; |
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unsigned long next; |
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|
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/* |
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* Because there are a number of different possible pagetable |
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* layouts for hugepage ranges, we limit knowledge of how |
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* things should be laid out to the allocation path |
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* (huge_pte_alloc(), above). Everything else works out the |
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* structure as it goes from information in the hugepd |
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* pointers. That means that we can't here use the |
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* optimization used in the normal page free_pgd_range(), of |
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* checking whether we're actually covering a large enough |
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* range to have to do anything at the top level of the walk |
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* instead of at the bottom. |
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* |
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* To make sense of this, you should probably go read the big |
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* block comment at the top of the normal free_pgd_range(), |
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* too. |
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*/ |
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do { |
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next = pgd_addr_end(addr, end); |
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pgd = pgd_offset(tlb->mm, addr); |
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p4d = p4d_offset(pgd, addr); |
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if (!is_hugepd(__hugepd(pgd_val(*pgd)))) { |
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if (p4d_none_or_clear_bad(p4d)) |
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continue; |
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hugetlb_free_pud_range(tlb, p4d, addr, next, floor, ceiling); |
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} else { |
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unsigned long more; |
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/* |
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* Increment next by the size of the huge mapping since |
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* there may be more than one entry at the pgd level |
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* for a single hugepage, but all of them point to the |
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* same kmem cache that holds the hugepte. |
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*/ |
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more = addr + (1 << hugepd_shift(*(hugepd_t *)pgd)); |
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if (more > next) |
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next = more; |
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|
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free_hugepd_range(tlb, (hugepd_t *)p4d, PGDIR_SHIFT, |
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addr, next, floor, ceiling); |
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} |
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} while (addr = next, addr != end); |
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} |
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|
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struct page *follow_huge_pd(struct vm_area_struct *vma, |
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unsigned long address, hugepd_t hpd, |
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int flags, int pdshift) |
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{ |
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pte_t *ptep; |
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spinlock_t *ptl; |
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struct page *page = NULL; |
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unsigned long mask; |
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int shift = hugepd_shift(hpd); |
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struct mm_struct *mm = vma->vm_mm; |
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retry: |
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/* |
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* hugepage directory entries are protected by mm->page_table_lock |
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* Use this instead of huge_pte_lockptr |
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*/ |
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ptl = &mm->page_table_lock; |
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spin_lock(ptl); |
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|
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ptep = hugepte_offset(hpd, address, pdshift); |
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if (pte_present(*ptep)) { |
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mask = (1UL << shift) - 1; |
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page = pte_page(*ptep); |
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page += ((address & mask) >> PAGE_SHIFT); |
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if (flags & FOLL_GET) |
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get_page(page); |
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} else { |
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if (is_hugetlb_entry_migration(*ptep)) { |
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spin_unlock(ptl); |
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__migration_entry_wait(mm, ptep, ptl); |
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goto retry; |
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} |
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} |
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spin_unlock(ptl); |
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return page; |
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} |
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|
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#ifdef CONFIG_PPC_MM_SLICES |
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unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, |
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unsigned long len, unsigned long pgoff, |
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unsigned long flags) |
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{ |
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struct hstate *hstate = hstate_file(file); |
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int mmu_psize = shift_to_mmu_psize(huge_page_shift(hstate)); |
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|
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#ifdef CONFIG_PPC_RADIX_MMU |
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if (radix_enabled()) |
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return radix__hugetlb_get_unmapped_area(file, addr, len, |
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pgoff, flags); |
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#endif |
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return slice_get_unmapped_area(addr, len, flags, mmu_psize, 1); |
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} |
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#endif |
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|
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unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) |
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{ |
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/* With radix we don't use slice, so derive it from vma*/ |
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if (IS_ENABLED(CONFIG_PPC_MM_SLICES) && !radix_enabled()) { |
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unsigned int psize = get_slice_psize(vma->vm_mm, vma->vm_start); |
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|
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return 1UL << mmu_psize_to_shift(psize); |
|
} |
|
return vma_kernel_pagesize(vma); |
|
} |
|
|
|
bool __init arch_hugetlb_valid_size(unsigned long size) |
|
{ |
|
int shift = __ffs(size); |
|
int mmu_psize; |
|
|
|
/* Check that it is a page size supported by the hardware and |
|
* that it fits within pagetable and slice limits. */ |
|
if (size <= PAGE_SIZE || !is_power_of_2(size)) |
|
return false; |
|
|
|
mmu_psize = check_and_get_huge_psize(shift); |
|
if (mmu_psize < 0) |
|
return false; |
|
|
|
BUG_ON(mmu_psize_defs[mmu_psize].shift != shift); |
|
|
|
return true; |
|
} |
|
|
|
static int __init add_huge_page_size(unsigned long long size) |
|
{ |
|
int shift = __ffs(size); |
|
|
|
if (!arch_hugetlb_valid_size((unsigned long)size)) |
|
return -EINVAL; |
|
|
|
hugetlb_add_hstate(shift - PAGE_SHIFT); |
|
return 0; |
|
} |
|
|
|
static int __init hugetlbpage_init(void) |
|
{ |
|
bool configured = false; |
|
int psize; |
|
|
|
if (hugetlb_disabled) { |
|
pr_info("HugeTLB support is disabled!\n"); |
|
return 0; |
|
} |
|
|
|
if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && !radix_enabled() && |
|
!mmu_has_feature(MMU_FTR_16M_PAGE)) |
|
return -ENODEV; |
|
|
|
for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { |
|
unsigned shift; |
|
unsigned pdshift; |
|
|
|
if (!mmu_psize_defs[psize].shift) |
|
continue; |
|
|
|
shift = mmu_psize_to_shift(psize); |
|
|
|
#ifdef CONFIG_PPC_BOOK3S_64 |
|
if (shift > PGDIR_SHIFT) |
|
continue; |
|
else if (shift > PUD_SHIFT) |
|
pdshift = PGDIR_SHIFT; |
|
else if (shift > PMD_SHIFT) |
|
pdshift = PUD_SHIFT; |
|
else |
|
pdshift = PMD_SHIFT; |
|
#else |
|
if (shift < PUD_SHIFT) |
|
pdshift = PMD_SHIFT; |
|
else if (shift < PGDIR_SHIFT) |
|
pdshift = PUD_SHIFT; |
|
else |
|
pdshift = PGDIR_SHIFT; |
|
#endif |
|
|
|
if (add_huge_page_size(1ULL << shift) < 0) |
|
continue; |
|
/* |
|
* if we have pdshift and shift value same, we don't |
|
* use pgt cache for hugepd. |
|
*/ |
|
if (pdshift > shift) { |
|
if (!IS_ENABLED(CONFIG_PPC_8xx)) |
|
pgtable_cache_add(pdshift - shift); |
|
} else if (IS_ENABLED(CONFIG_PPC_FSL_BOOK3E) || |
|
IS_ENABLED(CONFIG_PPC_8xx)) { |
|
pgtable_cache_add(PTE_T_ORDER); |
|
} |
|
|
|
configured = true; |
|
} |
|
|
|
if (configured) { |
|
if (IS_ENABLED(CONFIG_HUGETLB_PAGE_SIZE_VARIABLE)) |
|
hugetlbpage_init_default(); |
|
} else |
|
pr_info("Failed to initialize. Disabling HugeTLB"); |
|
|
|
return 0; |
|
} |
|
|
|
arch_initcall(hugetlbpage_init); |
|
|
|
void __init gigantic_hugetlb_cma_reserve(void) |
|
{ |
|
unsigned long order = 0; |
|
|
|
if (radix_enabled()) |
|
order = PUD_SHIFT - PAGE_SHIFT; |
|
else if (!firmware_has_feature(FW_FEATURE_LPAR) && mmu_psize_defs[MMU_PAGE_16G].shift) |
|
/* |
|
* For pseries we do use ibm,expected#pages for reserving 16G pages. |
|
*/ |
|
order = mmu_psize_to_shift(MMU_PAGE_16G) - PAGE_SHIFT; |
|
|
|
if (order) { |
|
VM_WARN_ON(order < MAX_ORDER); |
|
hugetlb_cma_reserve(order); |
|
} |
|
}
|
|
|