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Diffstat (limited to 'arch/ppc64/mm/tlb.c')
-rw-r--r--arch/ppc64/mm/tlb.c196
1 files changed, 0 insertions, 196 deletions
diff --git a/arch/ppc64/mm/tlb.c b/arch/ppc64/mm/tlb.c
deleted file mode 100644
index 09ab81a10f4..00000000000
--- a/arch/ppc64/mm/tlb.c
+++ /dev/null
@@ -1,196 +0,0 @@
-/*
- * This file contains the routines for flushing entries from the
- * TLB and MMU hash table.
- *
- * Derived from arch/ppc64/mm/init.c:
- * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
- *
- * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
- * and Cort Dougan (PReP) (cort@cs.nmt.edu)
- * Copyright (C) 1996 Paul Mackerras
- * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
- *
- * Derived from "arch/i386/mm/init.c"
- * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
- *
- * Dave Engebretsen <engebret@us.ibm.com>
- * Rework for PPC64 port.
- *
- * 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/config.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/init.h>
-#include <linux/percpu.h>
-#include <linux/hardirq.h>
-#include <asm/pgalloc.h>
-#include <asm/tlbflush.h>
-#include <asm/tlb.h>
-#include <linux/highmem.h>
-
-DEFINE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
-
-/* This is declared as we are using the more or less generic
- * include/asm-ppc64/tlb.h file -- tgall
- */
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
-DEFINE_PER_CPU(struct pte_freelist_batch *, pte_freelist_cur);
-unsigned long pte_freelist_forced_free;
-
-struct pte_freelist_batch
-{
- struct rcu_head rcu;
- unsigned int index;
- pgtable_free_t tables[0];
-};
-
-DEFINE_PER_CPU(struct pte_freelist_batch *, pte_freelist_cur);
-unsigned long pte_freelist_forced_free;
-
-#define PTE_FREELIST_SIZE \
- ((PAGE_SIZE - sizeof(struct pte_freelist_batch)) \
- / sizeof(pgtable_free_t))
-
-#ifdef CONFIG_SMP
-static void pte_free_smp_sync(void *arg)
-{
- /* Do nothing, just ensure we sync with all CPUs */
-}
-#endif
-
-/* This is only called when we are critically out of memory
- * (and fail to get a page in pte_free_tlb).
- */
-static void pgtable_free_now(pgtable_free_t pgf)
-{
- pte_freelist_forced_free++;
-
- smp_call_function(pte_free_smp_sync, NULL, 0, 1);
-
- pgtable_free(pgf);
-}
-
-static void pte_free_rcu_callback(struct rcu_head *head)
-{
- struct pte_freelist_batch *batch =
- container_of(head, struct pte_freelist_batch, rcu);
- unsigned int i;
-
- for (i = 0; i < batch->index; i++)
- pgtable_free(batch->tables[i]);
-
- free_page((unsigned long)batch);
-}
-
-static void pte_free_submit(struct pte_freelist_batch *batch)
-{
- INIT_RCU_HEAD(&batch->rcu);
- call_rcu(&batch->rcu, pte_free_rcu_callback);
-}
-
-void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf)
-{
- /* This is safe as we are holding page_table_lock */
- cpumask_t local_cpumask = cpumask_of_cpu(smp_processor_id());
- struct pte_freelist_batch **batchp = &__get_cpu_var(pte_freelist_cur);
-
- if (atomic_read(&tlb->mm->mm_users) < 2 ||
- cpus_equal(tlb->mm->cpu_vm_mask, local_cpumask)) {
- pgtable_free(pgf);
- return;
- }
-
- if (*batchp == NULL) {
- *batchp = (struct pte_freelist_batch *)__get_free_page(GFP_ATOMIC);
- if (*batchp == NULL) {
- pgtable_free_now(pgf);
- return;
- }
- (*batchp)->index = 0;
- }
- (*batchp)->tables[(*batchp)->index++] = pgf;
- if ((*batchp)->index == PTE_FREELIST_SIZE) {
- pte_free_submit(*batchp);
- *batchp = NULL;
- }
-}
-
-/*
- * Update the MMU hash table to correspond with a change to
- * a Linux PTE. If wrprot is true, it is permissible to
- * change the existing HPTE to read-only rather than removing it
- * (if we remove it we should clear the _PTE_HPTEFLAGS bits).
- */
-void hpte_update(struct mm_struct *mm, unsigned long addr,
- unsigned long pte, int wrprot)
-{
- struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
- unsigned long vsid;
- int i;
-
- i = batch->index;
-
- /*
- * This can happen when we are in the middle of a TLB batch and
- * we encounter memory pressure (eg copy_page_range when it tries
- * to allocate a new pte). If we have to reclaim memory and end
- * up scanning and resetting referenced bits then our batch context
- * will change mid stream.
- */
- if (i != 0 && (mm != batch->mm || batch->large != pte_huge(pte))) {
- flush_tlb_pending();
- i = 0;
- }
- if (i == 0) {
- batch->mm = mm;
- batch->large = pte_huge(pte);
- }
- if (addr < KERNELBASE) {
- vsid = get_vsid(mm->context.id, addr);
- WARN_ON(vsid == 0);
- } else
- vsid = get_kernel_vsid(addr);
- batch->vaddr[i] = (vsid << 28 ) | (addr & 0x0fffffff);
- batch->pte[i] = __pte(pte);
- batch->index = ++i;
- if (i >= PPC64_TLB_BATCH_NR)
- flush_tlb_pending();
-}
-
-void __flush_tlb_pending(struct ppc64_tlb_batch *batch)
-{
- int i;
- int cpu;
- cpumask_t tmp;
- int local = 0;
-
- BUG_ON(in_interrupt());
-
- cpu = get_cpu();
- i = batch->index;
- tmp = cpumask_of_cpu(cpu);
- if (cpus_equal(batch->mm->cpu_vm_mask, tmp))
- local = 1;
-
- if (i == 1)
- flush_hash_page(batch->vaddr[0], batch->pte[0], local);
- else
- flush_hash_range(i, local);
- batch->index = 0;
- put_cpu();
-}
-
-void pte_free_finish(void)
-{
- /* This is safe as we are holding page_table_lock */
- struct pte_freelist_batch **batchp = &__get_cpu_var(pte_freelist_cur);
-
- if (*batchp == NULL)
- return;
- pte_free_submit(*batchp);
- *batchp = NULL;
-}