diff options
Diffstat (limited to 'ANDROID_3.4.5/include/asm-generic/tlb.h')
| -rw-r--r-- | ANDROID_3.4.5/include/asm-generic/tlb.h | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/ANDROID_3.4.5/include/asm-generic/tlb.h b/ANDROID_3.4.5/include/asm-generic/tlb.h deleted file mode 100644 index f96a5b58..00000000 --- a/ANDROID_3.4.5/include/asm-generic/tlb.h +++ /dev/null @@ -1,178 +0,0 @@ -/* include/asm-generic/tlb.h - * - * Generic TLB shootdown code - * - * Copyright 2001 Red Hat, Inc. - * Based on code from mm/memory.c Copyright Linus Torvalds and others. - * - * Copyright 2011 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com> - * - * 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. - */ -#ifndef _ASM_GENERIC__TLB_H -#define _ASM_GENERIC__TLB_H - -#include <linux/swap.h> -#include <asm/pgalloc.h> -#include <asm/tlbflush.h> - -#ifdef CONFIG_HAVE_RCU_TABLE_FREE -/* - * Semi RCU freeing of the page directories. - * - * This is needed by some architectures to implement software pagetable walkers. - * - * gup_fast() and other software pagetable walkers do a lockless page-table - * walk and therefore needs some synchronization with the freeing of the page - * directories. The chosen means to accomplish that is by disabling IRQs over - * the walk. - * - * Architectures that use IPIs to flush TLBs will then automagically DTRT, - * since we unlink the page, flush TLBs, free the page. Since the disabling of - * IRQs delays the completion of the TLB flush we can never observe an already - * freed page. - * - * Architectures that do not have this (PPC) need to delay the freeing by some - * other means, this is that means. - * - * What we do is batch the freed directory pages (tables) and RCU free them. - * We use the sched RCU variant, as that guarantees that IRQ/preempt disabling - * holds off grace periods. - * - * However, in order to batch these pages we need to allocate storage, this - * allocation is deep inside the MM code and can thus easily fail on memory - * pressure. To guarantee progress we fall back to single table freeing, see - * the implementation of tlb_remove_table_one(). - * - */ -struct mmu_table_batch { - struct rcu_head rcu; - unsigned int nr; - void *tables[0]; -}; - -#define MAX_TABLE_BATCH \ - ((PAGE_SIZE - sizeof(struct mmu_table_batch)) / sizeof(void *)) - -extern void tlb_table_flush(struct mmu_gather *tlb); -extern void tlb_remove_table(struct mmu_gather *tlb, void *table); - -#endif - -/* - * If we can't allocate a page to make a big batch of page pointers - * to work on, then just handle a few from the on-stack structure. - */ -#define MMU_GATHER_BUNDLE 8 - -struct mmu_gather_batch { - struct mmu_gather_batch *next; - unsigned int nr; - unsigned int max; - struct page *pages[0]; -}; - -#define MAX_GATHER_BATCH \ - ((PAGE_SIZE - sizeof(struct mmu_gather_batch)) / sizeof(void *)) - -/* struct mmu_gather is an opaque type used by the mm code for passing around - * any data needed by arch specific code for tlb_remove_page. - */ -struct mmu_gather { - struct mm_struct *mm; -#ifdef CONFIG_HAVE_RCU_TABLE_FREE - struct mmu_table_batch *batch; -#endif - unsigned int need_flush : 1, /* Did free PTEs */ - fast_mode : 1; /* No batching */ - - unsigned int fullmm; - - struct mmu_gather_batch *active; - struct mmu_gather_batch local; - struct page *__pages[MMU_GATHER_BUNDLE]; -}; - -#define HAVE_GENERIC_MMU_GATHER - -static inline int tlb_fast_mode(struct mmu_gather *tlb) -{ -#ifdef CONFIG_SMP - return tlb->fast_mode; -#else - /* - * For UP we don't need to worry about TLB flush - * and page free order so much.. - */ - return 1; -#endif -} - -void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, bool fullmm); -void tlb_flush_mmu(struct mmu_gather *tlb); -void tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end); -int __tlb_remove_page(struct mmu_gather *tlb, struct page *page); - -/* tlb_remove_page - * Similar to __tlb_remove_page but will call tlb_flush_mmu() itself when - * required. - */ -static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) -{ - if (!__tlb_remove_page(tlb, page)) - tlb_flush_mmu(tlb); -} - -/** - * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation. - * - * Record the fact that pte's were really umapped in ->need_flush, so we can - * later optimise away the tlb invalidate. This helps when userspace is - * unmapping already-unmapped pages, which happens quite a lot. - */ -#define tlb_remove_tlb_entry(tlb, ptep, address) \ - do { \ - tlb->need_flush = 1; \ - __tlb_remove_tlb_entry(tlb, ptep, address); \ - } while (0) - -/** - * tlb_remove_pmd_tlb_entry - remember a pmd mapping for later tlb invalidation - * This is a nop so far, because only x86 needs it. - */ -#ifndef __tlb_remove_pmd_tlb_entry -#define __tlb_remove_pmd_tlb_entry(tlb, pmdp, address) do {} while (0) -#endif - -#define tlb_remove_pmd_tlb_entry(tlb, pmdp, address) \ - do { \ - tlb->need_flush = 1; \ - __tlb_remove_pmd_tlb_entry(tlb, pmdp, address); \ - } while (0) - -#define pte_free_tlb(tlb, ptep, address) \ - do { \ - tlb->need_flush = 1; \ - __pte_free_tlb(tlb, ptep, address); \ - } while (0) - -#ifndef __ARCH_HAS_4LEVEL_HACK -#define pud_free_tlb(tlb, pudp, address) \ - do { \ - tlb->need_flush = 1; \ - __pud_free_tlb(tlb, pudp, address); \ - } while (0) -#endif - -#define pmd_free_tlb(tlb, pmdp, address) \ - do { \ - tlb->need_flush = 1; \ - __pmd_free_tlb(tlb, pmdp, address); \ - } while (0) - -#define tlb_migrate_finish(mm) do {} while (0) - -#endif /* _ASM_GENERIC__TLB_H */ |