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![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
180 lines
4.6 KiB
C
180 lines
4.6 KiB
C
/*
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* This file contains the routines for flushing entries from the
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* TLB and MMU hash table.
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*
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* Derived from arch/ppc64/mm/init.c:
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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* Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*
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* Dave Engebretsen <engebret@us.ibm.com>
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* Rework for PPC64 port.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/percpu.h>
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#include <linux/hardirq.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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#include <asm/tlb.h>
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#include <linux/highmem.h>
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DEFINE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
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/* This is declared as we are using the more or less generic
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* include/asm-ppc64/tlb.h file -- tgall
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*/
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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DEFINE_PER_CPU(struct pte_freelist_batch *, pte_freelist_cur);
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unsigned long pte_freelist_forced_free;
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void __pte_free_tlb(struct mmu_gather *tlb, struct page *ptepage)
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{
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/* This is safe as we are holding page_table_lock */
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cpumask_t local_cpumask = cpumask_of_cpu(smp_processor_id());
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struct pte_freelist_batch **batchp = &__get_cpu_var(pte_freelist_cur);
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if (atomic_read(&tlb->mm->mm_users) < 2 ||
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cpus_equal(tlb->mm->cpu_vm_mask, local_cpumask)) {
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pte_free(ptepage);
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return;
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}
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if (*batchp == NULL) {
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*batchp = (struct pte_freelist_batch *)__get_free_page(GFP_ATOMIC);
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if (*batchp == NULL) {
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pte_free_now(ptepage);
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return;
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}
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(*batchp)->index = 0;
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}
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(*batchp)->pages[(*batchp)->index++] = ptepage;
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if ((*batchp)->index == PTE_FREELIST_SIZE) {
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pte_free_submit(*batchp);
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*batchp = NULL;
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}
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}
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/*
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* Update the MMU hash table to correspond with a change to
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* a Linux PTE. If wrprot is true, it is permissible to
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* change the existing HPTE to read-only rather than removing it
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* (if we remove it we should clear the _PTE_HPTEFLAGS bits).
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*/
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void hpte_update(struct mm_struct *mm, unsigned long addr,
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unsigned long pte, int wrprot)
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{
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int i;
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unsigned long context = 0;
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struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
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if (REGION_ID(addr) == USER_REGION_ID)
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context = mm->context.id;
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i = batch->index;
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/*
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* This can happen when we are in the middle of a TLB batch and
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* we encounter memory pressure (eg copy_page_range when it tries
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* to allocate a new pte). If we have to reclaim memory and end
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* up scanning and resetting referenced bits then our batch context
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* will change mid stream.
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*/
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if (unlikely(i != 0 && context != batch->context)) {
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flush_tlb_pending();
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i = 0;
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}
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if (i == 0) {
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batch->context = context;
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batch->mm = mm;
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}
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batch->pte[i] = __pte(pte);
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batch->addr[i] = addr;
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batch->index = ++i;
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if (i >= PPC64_TLB_BATCH_NR)
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flush_tlb_pending();
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}
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void __flush_tlb_pending(struct ppc64_tlb_batch *batch)
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{
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int i;
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int cpu;
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cpumask_t tmp;
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int local = 0;
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BUG_ON(in_interrupt());
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cpu = get_cpu();
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i = batch->index;
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tmp = cpumask_of_cpu(cpu);
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if (cpus_equal(batch->mm->cpu_vm_mask, tmp))
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local = 1;
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if (i == 1)
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flush_hash_page(batch->context, batch->addr[0], batch->pte[0],
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local);
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else
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flush_hash_range(batch->context, i, local);
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batch->index = 0;
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put_cpu();
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}
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#ifdef CONFIG_SMP
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static void pte_free_smp_sync(void *arg)
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{
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/* Do nothing, just ensure we sync with all CPUs */
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}
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#endif
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/* This is only called when we are critically out of memory
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* (and fail to get a page in pte_free_tlb).
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*/
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void pte_free_now(struct page *ptepage)
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{
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pte_freelist_forced_free++;
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smp_call_function(pte_free_smp_sync, NULL, 0, 1);
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pte_free(ptepage);
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}
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static void pte_free_rcu_callback(struct rcu_head *head)
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{
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struct pte_freelist_batch *batch =
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container_of(head, struct pte_freelist_batch, rcu);
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unsigned int i;
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for (i = 0; i < batch->index; i++)
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pte_free(batch->pages[i]);
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free_page((unsigned long)batch);
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}
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void pte_free_submit(struct pte_freelist_batch *batch)
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{
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INIT_RCU_HEAD(&batch->rcu);
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call_rcu(&batch->rcu, pte_free_rcu_callback);
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}
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void pte_free_finish(void)
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{
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/* This is safe as we are holding page_table_lock */
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struct pte_freelist_batch **batchp = &__get_cpu_var(pte_freelist_cur);
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if (*batchp == NULL)
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return;
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pte_free_submit(*batchp);
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*batchp = NULL;
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}
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