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>
This commit is contained in:
Christophe Leroy
committed by
Michael Ellerman
Michael Ellerman
parent
9d9f2cccde
commit
47d99948ee
152
arch/powerpc/mm/book3s64/hash_hugetlbpage.c
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152
arch/powerpc/mm/book3s64/hash_hugetlbpage.c
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// SPDX-License-Identifier: GPL-2.0
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/*
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* PPC64 Huge TLB Page Support for hash based MMUs (POWER4 and later)
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*
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* Copyright (C) 2003 David Gibson, IBM Corporation.
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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/hugetlb.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/cacheflush.h>
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#include <asm/machdep.h>
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extern long hpte_insert_repeating(unsigned long hash, unsigned long vpn,
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unsigned long pa, unsigned long rlags,
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unsigned long vflags, int psize, int ssize);
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int __hash_page_huge(unsigned long ea, unsigned long access, unsigned long vsid,
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pte_t *ptep, unsigned long trap, unsigned long flags,
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int ssize, unsigned int shift, unsigned int mmu_psize)
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{
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real_pte_t rpte;
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unsigned long vpn;
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unsigned long old_pte, new_pte;
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unsigned long rflags, pa;
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long slot, offset;
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BUG_ON(shift != mmu_psize_defs[mmu_psize].shift);
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/* Search the Linux page table for a match with va */
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vpn = hpt_vpn(ea, vsid, ssize);
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/*
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* At this point, we have a pte (old_pte) which can be used to build
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* or update an HPTE. There are 2 cases:
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*
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* 1. There is a valid (present) pte with no associated HPTE (this is
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* the most common case)
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* 2. There is a valid (present) pte with an associated HPTE. The
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* current values of the pp bits in the HPTE prevent access
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* because we are doing software DIRTY bit management and the
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* page is currently not DIRTY.
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*/
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do {
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old_pte = pte_val(*ptep);
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/* If PTE busy, retry the access */
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if (unlikely(old_pte & H_PAGE_BUSY))
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return 0;
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/* If PTE permissions don't match, take page fault */
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if (unlikely(!check_pte_access(access, old_pte)))
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return 1;
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/*
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* Try to lock the PTE, add ACCESSED and DIRTY if it was
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* a write access
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*/
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new_pte = old_pte | H_PAGE_BUSY | _PAGE_ACCESSED;
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if (access & _PAGE_WRITE)
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new_pte |= _PAGE_DIRTY;
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} while(!pte_xchg(ptep, __pte(old_pte), __pte(new_pte)));
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/* Make sure this is a hugetlb entry */
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if (old_pte & (H_PAGE_THP_HUGE | _PAGE_DEVMAP))
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return 0;
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rflags = htab_convert_pte_flags(new_pte);
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if (unlikely(mmu_psize == MMU_PAGE_16G))
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offset = PTRS_PER_PUD;
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else
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offset = PTRS_PER_PMD;
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rpte = __real_pte(__pte(old_pte), ptep, offset);
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if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
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/*
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* No CPU has hugepages but lacks no execute, so we
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* don't need to worry about that case
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*/
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rflags = hash_page_do_lazy_icache(rflags, __pte(old_pte), trap);
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/* Check if pte already has an hpte (case 2) */
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if (unlikely(old_pte & H_PAGE_HASHPTE)) {
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/* There MIGHT be an HPTE for this pte */
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unsigned long gslot;
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gslot = pte_get_hash_gslot(vpn, shift, ssize, rpte, 0);
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if (mmu_hash_ops.hpte_updatepp(gslot, rflags, vpn, mmu_psize,
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mmu_psize, ssize, flags) == -1)
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old_pte &= ~_PAGE_HPTEFLAGS;
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}
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if (likely(!(old_pte & H_PAGE_HASHPTE))) {
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unsigned long hash = hpt_hash(vpn, shift, ssize);
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pa = pte_pfn(__pte(old_pte)) << PAGE_SHIFT;
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/* clear HPTE slot informations in new PTE */
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new_pte = (new_pte & ~_PAGE_HPTEFLAGS) | H_PAGE_HASHPTE;
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slot = hpte_insert_repeating(hash, vpn, pa, rflags, 0,
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mmu_psize, ssize);
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/*
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* Hypervisor failure. Restore old pte and return -1
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* similar to __hash_page_*
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*/
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if (unlikely(slot == -2)) {
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*ptep = __pte(old_pte);
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hash_failure_debug(ea, access, vsid, trap, ssize,
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mmu_psize, mmu_psize, old_pte);
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return -1;
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}
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new_pte |= pte_set_hidx(ptep, rpte, 0, slot, offset);
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}
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/*
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* No need to use ldarx/stdcx here
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*/
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*ptep = __pte(new_pte & ~H_PAGE_BUSY);
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return 0;
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}
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pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep)
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{
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unsigned long pte_val;
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/*
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* Clear the _PAGE_PRESENT so that no hardware parallel update is
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* possible. Also keep the pte_present true so that we don't take
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* wrong fault.
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*/
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pte_val = pte_update(vma->vm_mm, addr, ptep,
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_PAGE_PRESENT, _PAGE_INVALID, 1);
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return __pte(pte_val);
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}
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void huge_ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr,
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pte_t *ptep, pte_t old_pte, pte_t pte)
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{
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if (radix_enabled())
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return radix__huge_ptep_modify_prot_commit(vma, addr, ptep,
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old_pte, pte);
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set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
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}
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