[deliverable/linux.git] / arch / powerpc / mm / tlb_hash32.c

/*
 * This file contains the routines for TLB flushing.
 * On machines where the MMU uses a hash table to store virtual to
 * physical translations, these routines flush entries from the
 * hash table also.
 *  -- paulus
 *
 *  Derived from arch/ppc/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
 *
 *  Derived from "arch/i386/mm/init.c"
 *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 *
 *  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/highmem.h>
#include <linux/pagemap.h>

#include <asm/tlbflush.h>
#include <asm/tlb.h>

#include "mmu_decl.h"

/*
 * Called when unmapping pages to flush entries from the TLB/hash table.
 */
void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, unsigned long addr)
{
	unsigned long ptephys;

	if (Hash != 0) {
		ptephys = __pa(ptep) & PAGE_MASK;
		flush_hash_pages(mm->context.id, addr, ptephys, 1);
	}
}
EXPORT_SYMBOL(flush_hash_entry);

/*
 * Called by ptep_set_access_flags, must flush on CPUs for which the
 * DSI handler can't just "fixup" the TLB on a write fault
 */
void flush_tlb_page_nohash(struct vm_area_struct *vma, unsigned long addr)
{
	if (Hash != 0)
		return;
	_tlbie(addr);
}

/*
 * Called at the end of a mmu_gather operation to make sure the
 * TLB flush is completely done.
 */
void tlb_flush(struct mmu_gather *tlb)
{
	if (Hash == 0) {
		/*
		 * 603 needs to flush the whole TLB here since
		 * it doesn't use a hash table.
		 */
		_tlbia();
	}
}

/*
 * TLB flushing:
 *
 *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
 *  - flush_tlb_page(vma, vmaddr) flushes one page
 *  - flush_tlb_range(vma, start, end) flushes a range of pages
 *  - flush_tlb_kernel_range(start, end) flushes kernel pages
 *
 * since the hardware hash table functions as an extension of the
 * tlb as far as the linux tables are concerned, flush it too.
 *    -- Cort
 */

/*
 * 750 SMP is a Bad Idea because the 750 doesn't broadcast all
 * the cache operations on the bus.  Hence we need to use an IPI
 * to get the other CPU(s) to invalidate their TLBs.
 */
#ifdef CONFIG_SMP_750
#define FINISH_FLUSH	smp_send_tlb_invalidate(0)
#else
#define FINISH_FLUSH	do { } while (0)
#endif

static void flush_range(struct mm_struct *mm, unsigned long start,
			unsigned long end)
{
	pmd_t *pmd;
	unsigned long pmd_end;
	int count;
	unsigned int ctx = mm->context.id;

	if (Hash == 0) {
		_tlbia();
		return;
	}
	start &= PAGE_MASK;
	if (start >= end)
		return;
	end = (end - 1) | ~PAGE_MASK;
	pmd = pmd_offset(pud_offset(pgd_offset(mm, start), start), start);
	for (;;) {
		pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1;
		if (pmd_end > end)
			pmd_end = end;
		if (!pmd_none(*pmd)) {
			count = ((pmd_end - start) >> PAGE_SHIFT) + 1;
			flush_hash_pages(ctx, start, pmd_val(*pmd), count);
		}
		if (pmd_end == end)
			break;
		start = pmd_end + 1;
		++pmd;
	}
}

/*
 * Flush kernel TLB entries in the given range
 */
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
	flush_range(&init_mm, start, end);
	FINISH_FLUSH;
}
EXPORT_SYMBOL(flush_tlb_kernel_range);

/*
 * Flush all the (user) entries for the address space described by mm.
 */
void flush_tlb_mm(struct mm_struct *mm)
{
	struct vm_area_struct *mp;

	if (Hash == 0) {
		_tlbia();
		return;
	}

	/*
	 * It is safe to go down the mm's list of vmas when called
	 * from dup_mmap, holding mmap_sem.  It would also be safe from
	 * unmap_region or exit_mmap, but not from vmtruncate on SMP -
	 * but it seems dup_mmap is the only SMP case which gets here.
	 */
	for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
		flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
	FINISH_FLUSH;
}
EXPORT_SYMBOL(flush_tlb_mm);

void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
{
	struct mm_struct *mm;
	pmd_t *pmd;

	if (Hash == 0) {
		_tlbie(vmaddr);
		return;
	}
	mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
	pmd = pmd_offset(pud_offset(pgd_offset(mm, vmaddr), vmaddr), vmaddr);
	if (!pmd_none(*pmd))
		flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1);
	FINISH_FLUSH;
}
EXPORT_SYMBOL(flush_tlb_page);

/*
 * For each address in the range, find the pte for the address
 * and check _PAGE_HASHPTE bit; if it is set, find and destroy
 * the corresponding HPTE.
 */
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
		     unsigned long end)
{
	flush_range(vma->vm_mm, start, end);
	FINISH_FLUSH;
}
EXPORT_SYMBOL(flush_tlb_range);
Commit	Line	Data
14cf11af PM	1	/*
	2	* This file contains the routines for TLB flushing.
	3	* On machines where the MMU uses a hash table to store virtual to
	4	* physical translations, these routines flush entries from the
	5	* hash table also.
	6	* -- paulus
	7	*
	8	* Derived from arch/ppc/mm/init.c:
	9	* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
	10	*
	11	* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
	12	* and Cort Dougan (PReP) (cort@cs.nmt.edu)
	13	* Copyright (C) 1996 Paul Mackerras
14cf11af PM	14	*
	15	* Derived from "arch/i386/mm/init.c"
	16	* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
	17	*
	18	* This program is free software; you can redistribute it and/or
	19	* modify it under the terms of the GNU General Public License
	20	* as published by the Free Software Foundation; either version
	21	* 2 of the License, or (at your option) any later version.
	22	*
	23	*/
	24
14cf11af PM	25	#include <linux/kernel.h>
	26	#include <linux/mm.h>
	27	#include <linux/init.h>
	28	#include <linux/highmem.h>
97d22d26 MK	29	#include <linux/pagemap.h>
97d22d26 MK	30
14cf11af PM	31	#include <asm/tlbflush.h>
	32	#include <asm/tlb.h>
	33
	34	#include "mmu_decl.h"
	35
	36	/*
	37	* Called when unmapping pages to flush entries from the TLB/hash table.
	38	*/
	39	void flush_hash_entry(struct mm_struct mm, pte_t ptep, unsigned long addr)
	40	{
	41	unsigned long ptephys;
	42
	43	if (Hash != 0) {
	44	ptephys = __pa(ptep) & PAGE_MASK;
6218a761	45	flush_hash_pages(mm->context.id, addr, ptephys, 1);
14cf11af PM	46	}
14cf11af PM	47	}
4ee7084e	48	EXPORT_SYMBOL(flush_hash_entry);
14cf11af PM	49
	50	/*
	51	* Called by ptep_set_access_flags, must flush on CPUs for which the
	52	* DSI handler can't just "fixup" the TLB on a write fault
	53	*/
	54	void flush_tlb_page_nohash(struct vm_area_struct *vma, unsigned long addr)
	55	{
	56	if (Hash != 0)
	57	return;
	58	_tlbie(addr);
	59	}
	60
	61	/*
	62	* Called at the end of a mmu_gather operation to make sure the
	63	* TLB flush is completely done.
	64	*/
	65	void tlb_flush(struct mmu_gather *tlb)
	66	{
	67	if (Hash == 0) {
	68	/*
	69	* 603 needs to flush the whole TLB here since
	70	* it doesn't use a hash table.
	71	*/
	72	_tlbia();
	73	}
	74	}
	75
	76	/*
	77	* TLB flushing:
	78	*
	79	* - flush_tlb_mm(mm) flushes the specified mm context TLB's
	80	* - flush_tlb_page(vma, vmaddr) flushes one page
	81	* - flush_tlb_range(vma, start, end) flushes a range of pages
	82	* - flush_tlb_kernel_range(start, end) flushes kernel pages
	83	*
	84	* since the hardware hash table functions as an extension of the
	85	* tlb as far as the linux tables are concerned, flush it too.
	86	* -- Cort
	87	*/
	88
	89	/*
	90	* 750 SMP is a Bad Idea because the 750 doesn't broadcast all
	91	* the cache operations on the bus. Hence we need to use an IPI
	92	* to get the other CPU(s) to invalidate their TLBs.
	93	*/
	94	#ifdef CONFIG_SMP_750
	95	#define FINISH_FLUSH smp_send_tlb_invalidate(0)
	96	#else
	97	#define FINISH_FLUSH do { } while (0)
	98	#endif
	99
	100	static void flush_range(struct mm_struct *mm, unsigned long start,
	101	unsigned long end)
	102	{
	103	pmd_t *pmd;
	104	unsigned long pmd_end;
	105	int count;
6218a761	106	unsigned int ctx = mm->context.id;
14cf11af PM	107
	108	if (Hash == 0) {
	109	_tlbia();
	110	return;
	111	}
	112	start &= PAGE_MASK;
	113	if (start >= end)
	114	return;
	115	end = (end - 1) \| ~PAGE_MASK;
f1a1eb29	116	pmd = pmd_offset(pud_offset(pgd_offset(mm, start), start), start);
14cf11af PM	117	for (;;) {
	118	pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1;
	119	if (pmd_end > end)
	120	pmd_end = end;
	121	if (!pmd_none(*pmd)) {
	122	count = ((pmd_end - start) >> PAGE_SHIFT) + 1;
	123	flush_hash_pages(ctx, start, pmd_val(*pmd), count);
	124	}
	125	if (pmd_end == end)
	126	break;
	127	start = pmd_end + 1;
	128	++pmd;
	129	}
	130	}
	131
	132	/*
	133	* Flush kernel TLB entries in the given range
	134	*/
	135	void flush_tlb_kernel_range(unsigned long start, unsigned long end)
	136	{
	137	flush_range(&init_mm, start, end);
	138	FINISH_FLUSH;
	139	}
f048aace	140	EXPORT_SYMBOL(flush_tlb_kernel_range);
14cf11af PM	141
	142	/*
	143	* Flush all the (user) entries for the address space described by mm.
	144	*/
	145	void flush_tlb_mm(struct mm_struct *mm)
	146	{
	147	struct vm_area_struct *mp;
	148
	149	if (Hash == 0) {
	150	_tlbia();
	151	return;
	152	}
	153
01edcd89 HD	154	/*
	155	* It is safe to go down the mm's list of vmas when called
	156	* from dup_mmap, holding mmap_sem. It would also be safe from
	157	* unmap_region or exit_mmap, but not from vmtruncate on SMP -
	158	* but it seems dup_mmap is the only SMP case which gets here.
	159	*/
14cf11af PM	160	for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
	161	flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
	162	FINISH_FLUSH;
	163	}
f048aace	164	EXPORT_SYMBOL(flush_tlb_mm);
14cf11af PM	165
	166	void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
	167	{
	168	struct mm_struct *mm;
	169	pmd_t *pmd;
	170
	171	if (Hash == 0) {
	172	_tlbie(vmaddr);
	173	return;
	174	}
	175	mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
f1a1eb29	176	pmd = pmd_offset(pud_offset(pgd_offset(mm, vmaddr), vmaddr), vmaddr);
14cf11af	177	if (!pmd_none(*pmd))
6218a761	178	flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1);
14cf11af PM	179	FINISH_FLUSH;
14cf11af PM	180	}
f048aace	181	EXPORT_SYMBOL(flush_tlb_page);
14cf11af PM	182
	183	/*
	184	* For each address in the range, find the pte for the address
	185	* and check _PAGE_HASHPTE bit; if it is set, find and destroy
	186	* the corresponding HPTE.
	187	*/
	188	void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
	189	unsigned long end)
	190	{
	191	flush_range(vma->vm_mm, start, end);
	192	FINISH_FLUSH;
	193	}
f048aace	194	EXPORT_SYMBOL(flush_tlb_range);