diff options
author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-03-29 10:00:00 +0000 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-05-03 01:18:38 +1000 |
commit | 47d99948eee48a84a4b242c17915a4ff59a29b5d (patch) | |
tree | 93b4b14a4775dfc34c00cd38454672e4233280db /arch/powerpc/mm/pgtable-book3s64.c | |
parent | 9d9f2cccde952126185e3336af0d4dc62eb254ad (diff) |
powerpc/mm: Move book3s64 specifics in subdirectory mm/book3s64
Many files in arch/powerpc/mm are only for book3S64. This patch
creates a subdirectory for them.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: Update the selftest sym links, shorten new filenames, cleanup some
whitespace and formatting in the new files.]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/pgtable-book3s64.c')
-rw-r--r-- | arch/powerpc/mm/pgtable-book3s64.c | 449 |
1 files changed, 0 insertions, 449 deletions
diff --git a/arch/powerpc/mm/pgtable-book3s64.c b/arch/powerpc/mm/pgtable-book3s64.c deleted file mode 100644 index 16bda049187a..000000000000 --- a/arch/powerpc/mm/pgtable-book3s64.c +++ /dev/null @@ -1,449 +0,0 @@ -/* - * Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#include <linux/sched.h> -#include <linux/mm_types.h> -#include <linux/memblock.h> -#include <misc/cxl-base.h> - -#include <asm/pgalloc.h> -#include <asm/tlb.h> -#include <asm/trace.h> -#include <asm/powernv.h> - -#include <mm/mmu_decl.h> -#include <trace/events/thp.h> - -unsigned long __pmd_frag_nr; -EXPORT_SYMBOL(__pmd_frag_nr); -unsigned long __pmd_frag_size_shift; -EXPORT_SYMBOL(__pmd_frag_size_shift); - -int (*register_process_table)(unsigned long base, unsigned long page_size, - unsigned long tbl_size); - -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -/* - * This is called when relaxing access to a hugepage. It's also called in the page - * fault path when we don't hit any of the major fault cases, ie, a minor - * update of _PAGE_ACCESSED, _PAGE_DIRTY, etc... The generic code will have - * handled those two for us, we additionally deal with missing execute - * permission here on some processors - */ -int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address, - pmd_t *pmdp, pmd_t entry, int dirty) -{ - int changed; -#ifdef CONFIG_DEBUG_VM - WARN_ON(!pmd_trans_huge(*pmdp) && !pmd_devmap(*pmdp)); - assert_spin_locked(pmd_lockptr(vma->vm_mm, pmdp)); -#endif - changed = !pmd_same(*(pmdp), entry); - if (changed) { - /* - * We can use MMU_PAGE_2M here, because only radix - * path look at the psize. - */ - __ptep_set_access_flags(vma, pmdp_ptep(pmdp), - pmd_pte(entry), address, MMU_PAGE_2M); - } - return changed; -} - -int pmdp_test_and_clear_young(struct vm_area_struct *vma, - unsigned long address, pmd_t *pmdp) -{ - return __pmdp_test_and_clear_young(vma->vm_mm, address, pmdp); -} -/* - * set a new huge pmd. We should not be called for updating - * an existing pmd entry. That should go via pmd_hugepage_update. - */ -void set_pmd_at(struct mm_struct *mm, unsigned long addr, - pmd_t *pmdp, pmd_t pmd) -{ -#ifdef CONFIG_DEBUG_VM - /* - * Make sure hardware valid bit is not set. We don't do - * tlb flush for this update. - */ - - WARN_ON(pte_hw_valid(pmd_pte(*pmdp)) && !pte_protnone(pmd_pte(*pmdp))); - assert_spin_locked(pmd_lockptr(mm, pmdp)); - WARN_ON(!(pmd_large(pmd) || pmd_devmap(pmd))); -#endif - trace_hugepage_set_pmd(addr, pmd_val(pmd)); - return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd)); -} - -static void do_nothing(void *unused) -{ - -} -/* - * Serialize against find_current_mm_pte which does lock-less - * lookup in page tables with local interrupts disabled. For huge pages - * it casts pmd_t to pte_t. Since format of pte_t is different from - * pmd_t we want to prevent transit from pmd pointing to page table - * to pmd pointing to huge page (and back) while interrupts are disabled. - * We clear pmd to possibly replace it with page table pointer in - * different code paths. So make sure we wait for the parallel - * find_current_mm_pte to finish. - */ -void serialize_against_pte_lookup(struct mm_struct *mm) -{ - smp_mb(); - smp_call_function_many(mm_cpumask(mm), do_nothing, NULL, 1); -} - -/* - * We use this to invalidate a pmdp entry before switching from a - * hugepte to regular pmd entry. - */ -pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, - pmd_t *pmdp) -{ - unsigned long old_pmd; - - old_pmd = pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, _PAGE_INVALID); - flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); - /* - * This ensures that generic code that rely on IRQ disabling - * to prevent a parallel THP split work as expected. - */ - serialize_against_pte_lookup(vma->vm_mm); - return __pmd(old_pmd); -} - -static pmd_t pmd_set_protbits(pmd_t pmd, pgprot_t pgprot) -{ - return __pmd(pmd_val(pmd) | pgprot_val(pgprot)); -} - -pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot) -{ - unsigned long pmdv; - - pmdv = (pfn << PAGE_SHIFT) & PTE_RPN_MASK; - return pmd_set_protbits(__pmd(pmdv), pgprot); -} - -pmd_t mk_pmd(struct page *page, pgprot_t pgprot) -{ - return pfn_pmd(page_to_pfn(page), pgprot); -} - -pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) -{ - unsigned long pmdv; - - pmdv = pmd_val(pmd); - pmdv &= _HPAGE_CHG_MASK; - return pmd_set_protbits(__pmd(pmdv), newprot); -} - -/* - * This is called at the end of handling a user page fault, when the - * fault has been handled by updating a HUGE PMD entry in the linux page tables. - * We use it to preload an HPTE into the hash table corresponding to - * the updated linux HUGE PMD entry. - */ -void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr, - pmd_t *pmd) -{ - if (radix_enabled()) - prefetch((void *)addr); -} -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ - -/* For use by kexec */ -void mmu_cleanup_all(void) -{ - if (radix_enabled()) - radix__mmu_cleanup_all(); - else if (mmu_hash_ops.hpte_clear_all) - mmu_hash_ops.hpte_clear_all(); -} - -#ifdef CONFIG_MEMORY_HOTPLUG -int __meminit create_section_mapping(unsigned long start, unsigned long end, int nid) -{ - if (radix_enabled()) - return radix__create_section_mapping(start, end, nid); - - return hash__create_section_mapping(start, end, nid); -} - -int __meminit remove_section_mapping(unsigned long start, unsigned long end) -{ - if (radix_enabled()) - return radix__remove_section_mapping(start, end); - - return hash__remove_section_mapping(start, end); -} -#endif /* CONFIG_MEMORY_HOTPLUG */ - -void __init mmu_partition_table_init(void) -{ - unsigned long patb_size = 1UL << PATB_SIZE_SHIFT; - unsigned long ptcr; - - BUILD_BUG_ON_MSG((PATB_SIZE_SHIFT > 36), "Partition table size too large."); - /* Initialize the Partition Table with no entries */ - partition_tb = memblock_alloc(patb_size, patb_size); - if (!partition_tb) - panic("%s: Failed to allocate %lu bytes align=0x%lx\n", - __func__, patb_size, patb_size); - - /* - * update partition table control register, - * 64 K size. - */ - ptcr = __pa(partition_tb) | (PATB_SIZE_SHIFT - 12); - mtspr(SPRN_PTCR, ptcr); - powernv_set_nmmu_ptcr(ptcr); -} - -void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0, - unsigned long dw1) -{ - unsigned long old = be64_to_cpu(partition_tb[lpid].patb0); - - partition_tb[lpid].patb0 = cpu_to_be64(dw0); - partition_tb[lpid].patb1 = cpu_to_be64(dw1); - - /* - * Global flush of TLBs and partition table caches for this lpid. - * The type of flush (hash or radix) depends on what the previous - * use of this partition ID was, not the new use. - */ - asm volatile("ptesync" : : : "memory"); - if (old & PATB_HR) { - asm volatile(PPC_TLBIE_5(%0,%1,2,0,1) : : - "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid)); - asm volatile(PPC_TLBIE_5(%0,%1,2,1,1) : : - "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid)); - trace_tlbie(lpid, 0, TLBIEL_INVAL_SET_LPID, lpid, 2, 0, 1); - } else { - asm volatile(PPC_TLBIE_5(%0,%1,2,0,0) : : - "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid)); - trace_tlbie(lpid, 0, TLBIEL_INVAL_SET_LPID, lpid, 2, 0, 0); - } - /* do we need fixup here ?*/ - asm volatile("eieio; tlbsync; ptesync" : : : "memory"); -} -EXPORT_SYMBOL_GPL(mmu_partition_table_set_entry); - -static pmd_t *get_pmd_from_cache(struct mm_struct *mm) -{ - void *pmd_frag, *ret; - - if (PMD_FRAG_NR == 1) - return NULL; - - spin_lock(&mm->page_table_lock); - ret = mm->context.pmd_frag; - if (ret) { - pmd_frag = ret + PMD_FRAG_SIZE; - /* - * If we have taken up all the fragments mark PTE page NULL - */ - if (((unsigned long)pmd_frag & ~PAGE_MASK) == 0) - pmd_frag = NULL; - mm->context.pmd_frag = pmd_frag; - } - spin_unlock(&mm->page_table_lock); - return (pmd_t *)ret; -} - -static pmd_t *__alloc_for_pmdcache(struct mm_struct *mm) -{ - void *ret = NULL; - struct page *page; - gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO; - - if (mm == &init_mm) - gfp &= ~__GFP_ACCOUNT; - page = alloc_page(gfp); - if (!page) - return NULL; - if (!pgtable_pmd_page_ctor(page)) { - __free_pages(page, 0); - return NULL; - } - - atomic_set(&page->pt_frag_refcount, 1); - - ret = page_address(page); - /* - * if we support only one fragment just return the - * allocated page. - */ - if (PMD_FRAG_NR == 1) - return ret; - - spin_lock(&mm->page_table_lock); - /* - * If we find pgtable_page set, we return - * the allocated page with single fragement - * count. - */ - if (likely(!mm->context.pmd_frag)) { - atomic_set(&page->pt_frag_refcount, PMD_FRAG_NR); - mm->context.pmd_frag = ret + PMD_FRAG_SIZE; - } - spin_unlock(&mm->page_table_lock); - - return (pmd_t *)ret; -} - -pmd_t *pmd_fragment_alloc(struct mm_struct *mm, unsigned long vmaddr) -{ - pmd_t *pmd; - - pmd = get_pmd_from_cache(mm); - if (pmd) - return pmd; - - return __alloc_for_pmdcache(mm); -} - -void pmd_fragment_free(unsigned long *pmd) -{ - struct page *page = virt_to_page(pmd); - - BUG_ON(atomic_read(&page->pt_frag_refcount) <= 0); - if (atomic_dec_and_test(&page->pt_frag_refcount)) { - pgtable_pmd_page_dtor(page); - __free_page(page); - } -} - -static inline void pgtable_free(void *table, int index) -{ - switch (index) { - case PTE_INDEX: - pte_fragment_free(table, 0); - break; - case PMD_INDEX: - pmd_fragment_free(table); - break; - case PUD_INDEX: - kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), table); - break; -#if defined(CONFIG_PPC_4K_PAGES) && defined(CONFIG_HUGETLB_PAGE) - /* 16M hugepd directory at pud level */ - case HTLB_16M_INDEX: - BUILD_BUG_ON(H_16M_CACHE_INDEX <= 0); - kmem_cache_free(PGT_CACHE(H_16M_CACHE_INDEX), table); - break; - /* 16G hugepd directory at the pgd level */ - case HTLB_16G_INDEX: - BUILD_BUG_ON(H_16G_CACHE_INDEX <= 0); - kmem_cache_free(PGT_CACHE(H_16G_CACHE_INDEX), table); - break; -#endif - /* We don't free pgd table via RCU callback */ - default: - BUG(); - } -} - -#ifdef CONFIG_SMP -void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int index) -{ - unsigned long pgf = (unsigned long)table; - - BUG_ON(index > MAX_PGTABLE_INDEX_SIZE); - pgf |= index; - tlb_remove_table(tlb, (void *)pgf); -} - -void __tlb_remove_table(void *_table) -{ - void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE); - unsigned int index = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE; - - return pgtable_free(table, index); -} -#else -void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int index) -{ - return pgtable_free(table, index); -} -#endif - -#ifdef CONFIG_PROC_FS -atomic_long_t direct_pages_count[MMU_PAGE_COUNT]; - -void arch_report_meminfo(struct seq_file *m) -{ - /* - * Hash maps the memory with one size mmu_linear_psize. - * So don't bother to print these on hash - */ - if (!radix_enabled()) - return; - seq_printf(m, "DirectMap4k: %8lu kB\n", - atomic_long_read(&direct_pages_count[MMU_PAGE_4K]) << 2); - seq_printf(m, "DirectMap64k: %8lu kB\n", - atomic_long_read(&direct_pages_count[MMU_PAGE_64K]) << 6); - seq_printf(m, "DirectMap2M: %8lu kB\n", - atomic_long_read(&direct_pages_count[MMU_PAGE_2M]) << 11); - seq_printf(m, "DirectMap1G: %8lu kB\n", - atomic_long_read(&direct_pages_count[MMU_PAGE_1G]) << 20); -} -#endif /* CONFIG_PROC_FS */ - -pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr, - pte_t *ptep) -{ - unsigned long pte_val; - - /* - * Clear the _PAGE_PRESENT so that no hardware parallel update is - * possible. Also keep the pte_present true so that we don't take - * wrong fault. - */ - pte_val = pte_update(vma->vm_mm, addr, ptep, _PAGE_PRESENT, _PAGE_INVALID, 0); - - return __pte(pte_val); - -} - -void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr, - pte_t *ptep, pte_t old_pte, pte_t pte) -{ - if (radix_enabled()) - return radix__ptep_modify_prot_commit(vma, addr, - ptep, old_pte, pte); - set_pte_at(vma->vm_mm, addr, ptep, pte); -} - -/* - * For hash translation mode, we use the deposited table to store hash slot - * information and they are stored at PTRS_PER_PMD offset from related pmd - * location. Hence a pmd move requires deposit and withdraw. - * - * For radix translation with split pmd ptl, we store the deposited table in the - * pmd page. Hence if we have different pmd page we need to withdraw during pmd - * move. - * - * With hash we use deposited table always irrespective of anon or not. - * With radix we use deposited table only for anonymous mapping. - */ -int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl, - struct spinlock *old_pmd_ptl, - struct vm_area_struct *vma) -{ - if (radix_enabled()) - return (new_pmd_ptl != old_pmd_ptl) && vma_is_anonymous(vma); - - return true; -} |