diff options
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/Makefile | 2 | ||||
| -rw-r--r-- | arch/powerpc/mm/hash_low_32.S | 30 | ||||
| -rw-r--r-- | arch/powerpc/mm/pgtable.c | 117 | ||||
| -rw-r--r-- | arch/powerpc/mm/pgtable_32.c | 21 | ||||
| -rw-r--r-- | arch/powerpc/mm/tlb_64.c | 86 |
5 files changed, 118 insertions, 138 deletions
diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile index e7392b45a5e..86e657bcfa7 100644 --- a/arch/powerpc/mm/Makefile +++ b/arch/powerpc/mm/Makefile @@ -6,7 +6,7 @@ ifeq ($(CONFIG_PPC64),y) EXTRA_CFLAGS += -mno-minimal-toc endif -obj-y := fault.o mem.o \ +obj-y := fault.o mem.o pgtable.o \ init_$(CONFIG_WORD_SIZE).o \ pgtable_$(CONFIG_WORD_SIZE).o \ mmu_context_$(CONFIG_WORD_SIZE).o diff --git a/arch/powerpc/mm/hash_low_32.S b/arch/powerpc/mm/hash_low_32.S index 7bffb70b9fe..c5536b8b37a 100644 --- a/arch/powerpc/mm/hash_low_32.S +++ b/arch/powerpc/mm/hash_low_32.S @@ -36,36 +36,6 @@ mmu_hash_lock: #endif /* CONFIG_SMP */ /* - * Sync CPUs with hash_page taking & releasing the hash - * table lock - */ -#ifdef CONFIG_SMP - .text -_GLOBAL(hash_page_sync) - mfmsr r10 - rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */ - mtmsr r0 - lis r8,mmu_hash_lock@h - ori r8,r8,mmu_hash_lock@l - lis r0,0x0fff - b 10f -11: lwz r6,0(r8) - cmpwi 0,r6,0 - bne 11b -10: lwarx r6,0,r8 - cmpwi 0,r6,0 - bne- 11b - stwcx. r0,0,r8 - bne- 10b - isync - eieio - li r0,0 - stw r0,0(r8) - mtmsr r10 - blr -#endif /* CONFIG_SMP */ - -/* * Load a PTE into the hash table, if possible. * The address is in r4, and r3 contains an access flag: * _PAGE_RW (0x400) if a write. diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c new file mode 100644 index 00000000000..6d94116fdea --- /dev/null +++ b/arch/powerpc/mm/pgtable.c @@ -0,0 +1,117 @@ +/* + * This file contains common routines for dealing with free of page tables + * + * Derived from arch/powerpc/mm/tlb_64.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 + * + * 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/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> + +static DEFINE_PER_CPU(struct pte_freelist_batch *, pte_freelist_cur); +static unsigned long pte_freelist_forced_free; + +struct pte_freelist_batch +{ + struct rcu_head rcu; + unsigned int index; + pgtable_free_t tables[0]; +}; + +#define PTE_FREELIST_SIZE \ + ((PAGE_SIZE - sizeof(struct pte_freelist_batch)) \ + / sizeof(pgtable_free_t)) + +static void pte_free_smp_sync(void *arg) +{ + /* Do nothing, just ensure we sync with all CPUs */ +} + +/* 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, 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 since tlb_gather_mmu has disabled preemption */ + 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; + } +} + +void pte_free_finish(void) +{ + /* This is safe since tlb_gather_mmu has disabled preemption */ + struct pte_freelist_batch **batchp = &__get_cpu_var(pte_freelist_cur); + + if (*batchp == NULL) + return; + pte_free_submit(*batchp); + *batchp = NULL; +} diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index 44fbc81c9b2..c7b755cba26 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -48,10 +48,6 @@ EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */ extern char etext[], _stext[]; -#if defined(CONFIG_SMP) && defined(CONFIG_PPC_STD_MMU_32) -extern void hash_page_sync(void); -#endif - #ifdef HAVE_BATS extern phys_addr_t v_mapped_by_bats(unsigned long va); extern unsigned long p_mapped_by_bats(phys_addr_t pa); @@ -125,23 +121,6 @@ pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address) return ptepage; } -void pte_free_kernel(struct mm_struct *mm, pte_t *pte) -{ -#if defined(CONFIG_SMP) && defined(CONFIG_PPC_STD_MMU_32) - hash_page_sync(); -#endif - free_page((unsigned long)pte); -} - -void pte_free(struct mm_struct *mm, pgtable_t ptepage) -{ -#if defined(CONFIG_SMP) && defined(CONFIG_PPC_STD_MMU_32) - hash_page_sync(); -#endif - pgtable_page_dtor(ptepage); - __free_page(ptepage); -} - void __iomem * ioremap(phys_addr_t addr, unsigned long size) { diff --git a/arch/powerpc/mm/tlb_64.c b/arch/powerpc/mm/tlb_64.c index be7dd422c0f..c931bc7d107 100644 --- a/arch/powerpc/mm/tlb_64.c +++ b/arch/powerpc/mm/tlb_64.c @@ -37,81 +37,6 @@ DEFINE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch); * arch/powerpc/include/asm/tlb.h file -- tgall */ DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); -static DEFINE_PER_CPU(struct pte_freelist_batch *, pte_freelist_cur); -static unsigned long pte_freelist_forced_free; - -struct pte_freelist_batch -{ - struct rcu_head rcu; - unsigned int index; - pgtable_free_t tables[0]; -}; - -#define PTE_FREELIST_SIZE \ - ((PAGE_SIZE - sizeof(struct pte_freelist_batch)) \ - / sizeof(pgtable_free_t)) - -static void pte_free_smp_sync(void *arg) -{ - /* Do nothing, just ensure we sync with all CPUs */ -} - -/* 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, 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 since tlb_gather_mmu has disabled preemption */ - 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; - } -} /* * A linux PTE was changed and the corresponding hash table entry @@ -229,17 +154,6 @@ void __flush_tlb_pending(struct ppc64_tlb_batch *batch) batch->index = 0; } -void pte_free_finish(void) -{ - /* This is safe since tlb_gather_mmu has disabled preemption */ - struct pte_freelist_batch **batchp = &__get_cpu_var(pte_freelist_cur); - - if (*batchp == NULL) - return; - pte_free_submit(*batchp); - *batchp = NULL; -} - /** * __flush_hash_table_range - Flush all HPTEs for a given address range * from the hash table (and the TLB). But keeps |