692 lines
17 KiB
C
692 lines
17 KiB
C
/*
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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 <rohit.seth@intel.com>
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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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bool hugetlb_disabled = false;
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#define hugepd_none(hpd) (hpd_val(hpd) == 0)
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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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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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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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bool __init hugetlb_node_alloc_supported(void)
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{
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return false;
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}
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#endif
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int __init alloc_bootmem_huge_page(struct hstate *h, int nid)
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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, nid);
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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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* 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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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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* 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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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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struct page *follow_huge_pd(struct vm_area_struct *vma,
|
|
unsigned long address, hugepd_t hpd,
|
|
int flags, int pdshift)
|
|
{
|
|
pte_t *ptep;
|
|
spinlock_t *ptl;
|
|
struct page *page = NULL;
|
|
unsigned long mask;
|
|
int shift = hugepd_shift(hpd);
|
|
struct mm_struct *mm = vma->vm_mm;
|
|
|
|
retry:
|
|
/*
|
|
* hugepage directory entries are protected by mm->page_table_lock
|
|
* Use this instead of huge_pte_lockptr
|
|
*/
|
|
ptl = &mm->page_table_lock;
|
|
spin_lock(ptl);
|
|
|
|
ptep = hugepte_offset(hpd, address, pdshift);
|
|
if (pte_present(*ptep)) {
|
|
mask = (1UL << shift) - 1;
|
|
page = pte_page(*ptep);
|
|
page += ((address & mask) >> PAGE_SHIFT);
|
|
if (flags & FOLL_GET)
|
|
get_page(page);
|
|
} else {
|
|
if (is_hugetlb_entry_migration(*ptep)) {
|
|
spin_unlock(ptl);
|
|
__migration_entry_wait(mm, ptep, ptl);
|
|
goto retry;
|
|
}
|
|
}
|
|
spin_unlock(ptl);
|
|
return page;
|
|
}
|
|
|
|
#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
|
|
static inline int file_to_psize(struct file *file)
|
|
{
|
|
struct hstate *hstate = hstate_file(file);
|
|
return shift_to_mmu_psize(huge_page_shift(hstate));
|
|
}
|
|
|
|
unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
|
|
unsigned long len, unsigned long pgoff,
|
|
unsigned long flags)
|
|
{
|
|
#ifdef CONFIG_PPC_RADIX_MMU
|
|
if (radix_enabled())
|
|
return radix__hugetlb_get_unmapped_area(file, addr, len,
|
|
pgoff, flags);
|
|
#endif
|
|
#ifdef CONFIG_PPC_MM_SLICES
|
|
return slice_get_unmapped_area(addr, len, flags, file_to_psize(file), 1);
|
|
#endif
|
|
BUG();
|
|
}
|
|
#endif
|
|
|
|
unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
|
|
{
|
|
/* With radix we don't use slice, so derive it from vma*/
|
|
if (IS_ENABLED(CONFIG_PPC_MM_SLICES) && !radix_enabled()) {
|
|
unsigned int psize = get_slice_psize(vma->vm_mm, vma->vm_start);
|
|
|
|
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)
|
|
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);
|
|
}
|
|
}
|