2005-04-17 06:20:36 +08:00
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/*
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* PowerPC64 port by Mike Corrigan and Dave Engebretsen
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* {mikejc|engebret}@us.ibm.com
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*
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* Copyright (c) 2000 Mike Corrigan <mikejc@us.ibm.com>
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*
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* SMP scalability work:
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* Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
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*
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* Module name: htab.c
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*
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* Description:
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* PowerPC Hashed Page Table functions
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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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#undef DEBUG
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2005-11-07 08:06:55 +08:00
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#undef DEBUG_LOW
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2005-04-17 06:20:36 +08:00
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#include <linux/spinlock.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/sysctl.h>
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#include <linux/ctype.h>
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#include <linux/cache.h>
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#include <linux/init.h>
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#include <linux/signal.h>
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#include <asm/processor.h>
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#include <asm/pgtable.h>
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#include <asm/mmu.h>
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#include <asm/mmu_context.h>
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#include <asm/page.h>
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#include <asm/types.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/machdep.h>
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#include <asm/lmb.h>
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#include <asm/abs_addr.h>
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#include <asm/tlbflush.h>
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#include <asm/io.h>
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#include <asm/eeh.h>
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#include <asm/tlb.h>
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#include <asm/cacheflush.h>
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#include <asm/cputable.h>
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#include <asm/sections.h>
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2007-05-08 14:27:27 +08:00
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#include <asm/spu.h>
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2007-10-30 03:24:19 +08:00
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#include <asm/udbg.h>
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2005-04-17 06:20:36 +08:00
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#ifdef DEBUG
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#define DBG(fmt...) udbg_printf(fmt)
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#else
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#define DBG(fmt...)
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#endif
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2005-11-07 08:06:55 +08:00
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#ifdef DEBUG_LOW
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#define DBG_LOW(fmt...) udbg_printf(fmt)
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#else
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#define DBG_LOW(fmt...)
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#endif
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#define KB (1024)
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#define MB (1024*KB)
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2005-04-17 06:20:36 +08:00
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/*
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* Note: pte --> Linux PTE
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* HPTE --> PowerPC Hashed Page Table Entry
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*
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* Execution context:
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* htab_initialize is called with the MMU off (of course), but
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* the kernel has been copied down to zero so it can directly
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* reference global data. At this point it is very difficult
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* to print debug info.
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*
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*/
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#ifdef CONFIG_U3_DART
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extern unsigned long dart_tablebase;
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#endif /* CONFIG_U3_DART */
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2005-11-10 10:37:51 +08:00
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static unsigned long _SDR1;
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struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
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2007-06-13 12:52:56 +08:00
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struct hash_pte *htab_address;
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2006-02-21 14:22:55 +08:00
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unsigned long htab_size_bytes;
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2005-07-13 16:11:42 +08:00
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unsigned long htab_hash_mask;
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2005-11-07 08:06:55 +08:00
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int mmu_linear_psize = MMU_PAGE_4K;
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int mmu_virtual_psize = MMU_PAGE_4K;
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2006-06-15 08:45:18 +08:00
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int mmu_vmalloc_psize = MMU_PAGE_4K;
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int mmu_io_psize = MMU_PAGE_4K;
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2007-10-11 18:37:10 +08:00
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int mmu_kernel_ssize = MMU_SEGSIZE_256M;
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int mmu_highuser_ssize = MMU_SEGSIZE_256M;
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2007-12-06 14:24:48 +08:00
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u16 mmu_slb_size = 64;
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2005-11-07 08:06:55 +08:00
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#ifdef CONFIG_HUGETLB_PAGE
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int mmu_huge_psize = MMU_PAGE_16M;
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unsigned int HPAGE_SHIFT;
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#endif
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2006-06-15 08:45:18 +08:00
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#ifdef CONFIG_PPC_64K_PAGES
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int mmu_ci_restrictions;
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#endif
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2007-04-12 13:30:23 +08:00
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#ifdef CONFIG_DEBUG_PAGEALLOC
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static u8 *linear_map_hash_slots;
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static unsigned long linear_map_hash_count;
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2007-04-18 09:50:09 +08:00
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static DEFINE_SPINLOCK(linear_map_hash_lock);
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2007-04-12 13:30:23 +08:00
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#endif /* CONFIG_DEBUG_PAGEALLOC */
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2005-04-17 06:20:36 +08:00
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2005-11-07 08:06:55 +08:00
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/* There are definitions of page sizes arrays to be used when none
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* is provided by the firmware.
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*/
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2005-04-17 06:20:36 +08:00
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2005-11-07 08:06:55 +08:00
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/* Pre-POWER4 CPUs (4k pages only)
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*/
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struct mmu_psize_def mmu_psize_defaults_old[] = {
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[MMU_PAGE_4K] = {
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.shift = 12,
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.sllp = 0,
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.penc = 0,
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.avpnm = 0,
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.tlbiel = 0,
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},
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};
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/* POWER4, GPUL, POWER5
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*
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* Support for 16Mb large pages
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*/
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struct mmu_psize_def mmu_psize_defaults_gp[] = {
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[MMU_PAGE_4K] = {
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.shift = 12,
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.sllp = 0,
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.penc = 0,
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.avpnm = 0,
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.tlbiel = 1,
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},
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[MMU_PAGE_16M] = {
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.shift = 24,
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.sllp = SLB_VSID_L,
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.penc = 0,
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.avpnm = 0x1UL,
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.tlbiel = 0,
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},
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};
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int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
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2007-10-11 18:37:10 +08:00
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unsigned long pstart, unsigned long mode,
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int psize, int ssize)
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2005-04-17 06:20:36 +08:00
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{
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2005-11-07 08:06:55 +08:00
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unsigned long vaddr, paddr;
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unsigned int step, shift;
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2005-04-17 06:20:36 +08:00
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unsigned long tmp_mode;
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2005-11-07 08:06:55 +08:00
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int ret = 0;
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2005-04-17 06:20:36 +08:00
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2005-11-07 08:06:55 +08:00
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shift = mmu_psize_defs[psize].shift;
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step = 1 << shift;
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2005-04-17 06:20:36 +08:00
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2005-11-07 08:06:55 +08:00
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for (vaddr = vstart, paddr = pstart; vaddr < vend;
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vaddr += step, paddr += step) {
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2007-04-12 13:30:23 +08:00
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unsigned long hash, hpteg;
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2007-10-11 18:37:10 +08:00
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unsigned long vsid = get_kernel_vsid(vaddr, ssize);
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unsigned long va = hpt_va(vaddr, vsid, ssize);
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2005-04-17 06:20:36 +08:00
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tmp_mode = mode;
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/* Make non-kernel text non-executable */
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2005-11-07 08:06:55 +08:00
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if (!in_kernel_text(vaddr))
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tmp_mode = mode | HPTE_R_N;
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2005-04-17 06:20:36 +08:00
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2007-10-11 18:37:10 +08:00
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hash = hpt_hash(va, shift, ssize);
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2005-04-17 06:20:36 +08:00
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hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
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2006-06-23 16:16:39 +08:00
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DBG("htab_bolt_mapping: calling %p\n", ppc_md.hpte_insert);
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BUG_ON(!ppc_md.hpte_insert);
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ret = ppc_md.hpte_insert(hpteg, va, paddr,
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2007-10-11 18:37:10 +08:00
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tmp_mode, HPTE_V_BOLTED, psize, ssize);
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2006-06-23 16:16:39 +08:00
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2005-11-07 08:06:55 +08:00
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if (ret < 0)
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break;
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2007-04-12 13:30:23 +08:00
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#ifdef CONFIG_DEBUG_PAGEALLOC
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if ((paddr >> PAGE_SHIFT) < linear_map_hash_count)
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linear_map_hash_slots[paddr >> PAGE_SHIFT] = ret | 0x80;
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#endif /* CONFIG_DEBUG_PAGEALLOC */
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2005-11-07 08:06:55 +08:00
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}
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return ret < 0 ? ret : 0;
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}
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2005-04-17 06:20:36 +08:00
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2007-10-11 18:37:10 +08:00
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static int __init htab_dt_scan_seg_sizes(unsigned long node,
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const char *uname, int depth,
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void *data)
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{
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char *type = of_get_flat_dt_prop(node, "device_type", NULL);
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u32 *prop;
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unsigned long size = 0;
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/* We are scanning "cpu" nodes only */
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if (type == NULL || strcmp(type, "cpu") != 0)
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return 0;
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prop = (u32 *)of_get_flat_dt_prop(node, "ibm,processor-segment-sizes",
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&size);
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if (prop == NULL)
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return 0;
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for (; size >= 4; size -= 4, ++prop) {
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if (prop[0] == 40) {
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DBG("1T segment support detected\n");
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cur_cpu_spec->cpu_features |= CPU_FTR_1T_SEGMENT;
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2007-10-12 14:44:55 +08:00
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return 1;
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2007-10-11 18:37:10 +08:00
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}
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}
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2007-10-15 22:58:59 +08:00
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cur_cpu_spec->cpu_features &= ~CPU_FTR_NO_SLBIE_B;
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2007-10-11 18:37:10 +08:00
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return 0;
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}
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static void __init htab_init_seg_sizes(void)
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{
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of_scan_flat_dt(htab_dt_scan_seg_sizes, NULL);
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}
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2005-11-07 08:06:55 +08:00
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static int __init htab_dt_scan_page_sizes(unsigned long node,
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const char *uname, int depth,
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void *data)
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{
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char *type = of_get_flat_dt_prop(node, "device_type", NULL);
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u32 *prop;
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unsigned long size = 0;
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/* We are scanning "cpu" nodes only */
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if (type == NULL || strcmp(type, "cpu") != 0)
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return 0;
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prop = (u32 *)of_get_flat_dt_prop(node,
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"ibm,segment-page-sizes", &size);
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if (prop != NULL) {
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DBG("Page sizes from device-tree:\n");
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size /= 4;
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cur_cpu_spec->cpu_features &= ~(CPU_FTR_16M_PAGE);
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while(size > 0) {
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unsigned int shift = prop[0];
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unsigned int slbenc = prop[1];
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unsigned int lpnum = prop[2];
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unsigned int lpenc = 0;
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struct mmu_psize_def *def;
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int idx = -1;
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size -= 3; prop += 3;
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while(size > 0 && lpnum) {
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if (prop[0] == shift)
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lpenc = prop[1];
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prop += 2; size -= 2;
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lpnum--;
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}
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switch(shift) {
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case 0xc:
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idx = MMU_PAGE_4K;
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break;
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case 0x10:
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idx = MMU_PAGE_64K;
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break;
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case 0x14:
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idx = MMU_PAGE_1M;
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break;
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case 0x18:
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idx = MMU_PAGE_16M;
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cur_cpu_spec->cpu_features |= CPU_FTR_16M_PAGE;
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break;
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case 0x22:
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idx = MMU_PAGE_16G;
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break;
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}
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if (idx < 0)
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continue;
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def = &mmu_psize_defs[idx];
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def->shift = shift;
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if (shift <= 23)
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def->avpnm = 0;
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else
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def->avpnm = (1 << (shift - 23)) - 1;
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def->sllp = slbenc;
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def->penc = lpenc;
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/* We don't know for sure what's up with tlbiel, so
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* for now we only set it for 4K and 64K pages
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*/
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if (idx == MMU_PAGE_4K || idx == MMU_PAGE_64K)
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def->tlbiel = 1;
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else
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def->tlbiel = 0;
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DBG(" %d: shift=%02x, sllp=%04x, avpnm=%08x, "
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"tlbiel=%d, penc=%d\n",
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idx, shift, def->sllp, def->avpnm, def->tlbiel,
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def->penc);
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2005-04-17 06:20:36 +08:00
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}
|
2005-11-07 08:06:55 +08:00
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return 1;
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}
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return 0;
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}
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static void __init htab_init_page_sizes(void)
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{
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int rc;
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/* Default to 4K pages only */
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memcpy(mmu_psize_defs, mmu_psize_defaults_old,
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sizeof(mmu_psize_defaults_old));
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/*
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* Try to find the available page sizes in the device-tree
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*/
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rc = of_scan_flat_dt(htab_dt_scan_page_sizes, NULL);
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if (rc != 0) /* Found */
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goto found;
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/*
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* Not in the device-tree, let's fallback on known size
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* list for 16M capable GP & GR
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*/
|
2006-11-30 08:46:22 +08:00
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|
if (cpu_has_feature(CPU_FTR_16M_PAGE))
|
2005-11-07 08:06:55 +08:00
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|
|
memcpy(mmu_psize_defs, mmu_psize_defaults_gp,
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sizeof(mmu_psize_defaults_gp));
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|
|
found:
|
2007-04-12 13:30:23 +08:00
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|
|
#ifndef CONFIG_DEBUG_PAGEALLOC
|
2005-11-07 08:06:55 +08:00
|
|
|
/*
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|
|
|
* Pick a size for the linear mapping. Currently, we only support
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|
|
* 16M, 1M and 4K which is the default
|
|
|
|
*/
|
|
|
|
if (mmu_psize_defs[MMU_PAGE_16M].shift)
|
|
|
|
mmu_linear_psize = MMU_PAGE_16M;
|
|
|
|
else if (mmu_psize_defs[MMU_PAGE_1M].shift)
|
|
|
|
mmu_linear_psize = MMU_PAGE_1M;
|
2007-04-12 13:30:23 +08:00
|
|
|
#endif /* CONFIG_DEBUG_PAGEALLOC */
|
2005-11-07 08:06:55 +08:00
|
|
|
|
2006-06-15 08:45:18 +08:00
|
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
2005-11-07 08:06:55 +08:00
|
|
|
/*
|
|
|
|
* Pick a size for the ordinary pages. Default is 4K, we support
|
2006-06-15 08:45:18 +08:00
|
|
|
* 64K for user mappings and vmalloc if supported by the processor.
|
|
|
|
* We only use 64k for ioremap if the processor
|
|
|
|
* (and firmware) support cache-inhibited large pages.
|
|
|
|
* If not, we use 4k and set mmu_ci_restrictions so that
|
|
|
|
* hash_page knows to switch processes that use cache-inhibited
|
|
|
|
* mappings to 4k pages.
|
2005-11-07 08:06:55 +08:00
|
|
|
*/
|
2006-06-15 08:45:18 +08:00
|
|
|
if (mmu_psize_defs[MMU_PAGE_64K].shift) {
|
2005-11-07 08:06:55 +08:00
|
|
|
mmu_virtual_psize = MMU_PAGE_64K;
|
2006-06-15 08:45:18 +08:00
|
|
|
mmu_vmalloc_psize = MMU_PAGE_64K;
|
2007-04-12 13:30:23 +08:00
|
|
|
if (mmu_linear_psize == MMU_PAGE_4K)
|
|
|
|
mmu_linear_psize = MMU_PAGE_64K;
|
2006-06-15 08:45:18 +08:00
|
|
|
if (cpu_has_feature(CPU_FTR_CI_LARGE_PAGE))
|
|
|
|
mmu_io_psize = MMU_PAGE_64K;
|
|
|
|
else
|
|
|
|
mmu_ci_restrictions = 1;
|
|
|
|
}
|
2007-04-12 13:30:23 +08:00
|
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
2005-11-07 08:06:55 +08:00
|
|
|
|
2006-06-15 08:45:18 +08:00
|
|
|
printk(KERN_DEBUG "Page orders: linear mapping = %d, "
|
|
|
|
"virtual = %d, io = %d\n",
|
2005-11-07 08:06:55 +08:00
|
|
|
mmu_psize_defs[mmu_linear_psize].shift,
|
2006-06-15 08:45:18 +08:00
|
|
|
mmu_psize_defs[mmu_virtual_psize].shift,
|
|
|
|
mmu_psize_defs[mmu_io_psize].shift);
|
2005-11-07 08:06:55 +08:00
|
|
|
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
|
|
/* Init large page size. Currently, we pick 16M or 1M depending
|
|
|
|
* on what is available
|
|
|
|
*/
|
|
|
|
if (mmu_psize_defs[MMU_PAGE_16M].shift)
|
|
|
|
mmu_huge_psize = MMU_PAGE_16M;
|
[PATCH] ppc64: Fix bug in SLB miss handler for hugepages
This patch, however, should be applied on top of the 64k-page-size patch to
fix some problems with hugepage (some pre-existing, another introduced by
this patch).
The patch fixes a bug in the SLB miss handler for hugepages on ppc64
introduced by the dynamic hugepage patch (commit id
c594adad5653491813959277fb87a2fef54c4e05) due to a misunderstanding of the
srd instruction's behaviour (mea culpa). The problem arises when a 64-bit
process maps some hugepages in the low 4GB of the address space (unusual).
In this case, as well as the 256M segment in question being marked for
hugepages, other segments at 32G intervals will be incorrectly marked for
hugepages.
In the process, this patch tweaks the semantics of the hugepage bitmaps to
be more sensible. Previously, an address below 4G was marked for hugepages
if the appropriate segment bit in the "low areas" bitmask was set *or* if
the low bit in the "high areas" bitmap was set (which would mark all
addresses below 1TB for hugepage). With this patch, any given address is
governed by a single bitmap. Addresses below 4GB are marked for hugepage
if and only if their bit is set in the "low areas" bitmap (256M
granularity). Addresses between 4GB and 1TB are marked for hugepage iff
the low bit in the "high areas" bitmap is set. Higher addresses are marked
for hugepage iff their bit in the "high areas" bitmap is set (1TB
granularity).
To avoid conflicts, this patch must be applied on top of BenH's pending
patch for 64k base page size [0]. As such, this patch also addresses a
hugepage problem introduced by that patch. That patch allows hugepages of
1MB in size on hardware which supports it, however, that won't work when
using 4k pages (4 level pagetable), because in that case hugepage PTEs are
stored at the PMD level, and each PMD entry maps 2MB. This patch simply
disallows hugepages in that case (we can do something cleverer to re-enable
them some other day).
Built, booted, and a handful of hugepage related tests passed on POWER5
LPAR (both ARCH=powerpc and ARCH=ppc64).
[0] http://gate.crashing.org/~benh/ppc64-64k-pages.diff
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-07 16:57:52 +08:00
|
|
|
/* With 4k/4level pagetables, we can't (for now) cope with a
|
|
|
|
* huge page size < PMD_SIZE */
|
2005-11-07 08:06:55 +08:00
|
|
|
else if (mmu_psize_defs[MMU_PAGE_1M].shift)
|
|
|
|
mmu_huge_psize = MMU_PAGE_1M;
|
|
|
|
|
|
|
|
/* Calculate HPAGE_SHIFT and sanity check it */
|
[PATCH] ppc64: Fix bug in SLB miss handler for hugepages
This patch, however, should be applied on top of the 64k-page-size patch to
fix some problems with hugepage (some pre-existing, another introduced by
this patch).
The patch fixes a bug in the SLB miss handler for hugepages on ppc64
introduced by the dynamic hugepage patch (commit id
c594adad5653491813959277fb87a2fef54c4e05) due to a misunderstanding of the
srd instruction's behaviour (mea culpa). The problem arises when a 64-bit
process maps some hugepages in the low 4GB of the address space (unusual).
In this case, as well as the 256M segment in question being marked for
hugepages, other segments at 32G intervals will be incorrectly marked for
hugepages.
In the process, this patch tweaks the semantics of the hugepage bitmaps to
be more sensible. Previously, an address below 4G was marked for hugepages
if the appropriate segment bit in the "low areas" bitmask was set *or* if
the low bit in the "high areas" bitmap was set (which would mark all
addresses below 1TB for hugepage). With this patch, any given address is
governed by a single bitmap. Addresses below 4GB are marked for hugepage
if and only if their bit is set in the "low areas" bitmap (256M
granularity). Addresses between 4GB and 1TB are marked for hugepage iff
the low bit in the "high areas" bitmap is set. Higher addresses are marked
for hugepage iff their bit in the "high areas" bitmap is set (1TB
granularity).
To avoid conflicts, this patch must be applied on top of BenH's pending
patch for 64k base page size [0]. As such, this patch also addresses a
hugepage problem introduced by that patch. That patch allows hugepages of
1MB in size on hardware which supports it, however, that won't work when
using 4k pages (4 level pagetable), because in that case hugepage PTEs are
stored at the PMD level, and each PMD entry maps 2MB. This patch simply
disallows hugepages in that case (we can do something cleverer to re-enable
them some other day).
Built, booted, and a handful of hugepage related tests passed on POWER5
LPAR (both ARCH=powerpc and ARCH=ppc64).
[0] http://gate.crashing.org/~benh/ppc64-64k-pages.diff
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-07 16:57:52 +08:00
|
|
|
if (mmu_psize_defs[mmu_huge_psize].shift > MIN_HUGEPTE_SHIFT &&
|
|
|
|
mmu_psize_defs[mmu_huge_psize].shift < SID_SHIFT)
|
2005-11-07 08:06:55 +08:00
|
|
|
HPAGE_SHIFT = mmu_psize_defs[mmu_huge_psize].shift;
|
|
|
|
else
|
|
|
|
HPAGE_SHIFT = 0; /* No huge pages dude ! */
|
|
|
|
#endif /* CONFIG_HUGETLB_PAGE */
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init htab_dt_scan_pftsize(unsigned long node,
|
|
|
|
const char *uname, int depth,
|
|
|
|
void *data)
|
|
|
|
{
|
|
|
|
char *type = of_get_flat_dt_prop(node, "device_type", NULL);
|
|
|
|
u32 *prop;
|
|
|
|
|
|
|
|
/* We are scanning "cpu" nodes only */
|
|
|
|
if (type == NULL || strcmp(type, "cpu") != 0)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
prop = (u32 *)of_get_flat_dt_prop(node, "ibm,pft-size", NULL);
|
|
|
|
if (prop != NULL) {
|
|
|
|
/* pft_size[0] is the NUMA CEC cookie */
|
|
|
|
ppc64_pft_size = prop[1];
|
|
|
|
return 1;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2005-11-07 08:06:55 +08:00
|
|
|
return 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2005-11-07 08:06:55 +08:00
|
|
|
static unsigned long __init htab_get_table_size(void)
|
2005-10-12 14:58:53 +08:00
|
|
|
{
|
2005-11-10 10:37:51 +08:00
|
|
|
unsigned long mem_size, rnd_mem_size, pteg_count;
|
2005-10-12 14:58:53 +08:00
|
|
|
|
2005-11-07 08:06:55 +08:00
|
|
|
/* If hash size isn't already provided by the platform, we try to
|
2006-01-10 07:10:13 +08:00
|
|
|
* retrieve it from the device-tree. If it's not there neither, we
|
2005-11-07 08:06:55 +08:00
|
|
|
* calculate it now based on the total RAM size
|
2005-10-12 14:58:53 +08:00
|
|
|
*/
|
2005-11-07 08:06:55 +08:00
|
|
|
if (ppc64_pft_size == 0)
|
|
|
|
of_scan_flat_dt(htab_dt_scan_pftsize, NULL);
|
2005-10-12 14:58:53 +08:00
|
|
|
if (ppc64_pft_size)
|
|
|
|
return 1UL << ppc64_pft_size;
|
|
|
|
|
|
|
|
/* round mem_size up to next power of 2 */
|
2005-11-10 10:37:51 +08:00
|
|
|
mem_size = lmb_phys_mem_size();
|
|
|
|
rnd_mem_size = 1UL << __ilog2(mem_size);
|
|
|
|
if (rnd_mem_size < mem_size)
|
2005-10-12 14:58:53 +08:00
|
|
|
rnd_mem_size <<= 1;
|
|
|
|
|
|
|
|
/* # pages / 2 */
|
|
|
|
pteg_count = max(rnd_mem_size >> (12 + 1), 1UL << 11);
|
|
|
|
|
|
|
|
return pteg_count << 7;
|
|
|
|
}
|
|
|
|
|
2005-11-08 08:25:48 +08:00
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
|
|
void create_section_mapping(unsigned long start, unsigned long end)
|
|
|
|
{
|
2006-03-21 17:45:51 +08:00
|
|
|
BUG_ON(htab_bolt_mapping(start, end, __pa(start),
|
2005-11-08 08:25:48 +08:00
|
|
|
_PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX,
|
2007-10-11 18:37:10 +08:00
|
|
|
mmu_linear_psize, mmu_kernel_ssize));
|
2005-11-08 08:25:48 +08:00
|
|
|
}
|
|
|
|
#endif /* CONFIG_MEMORY_HOTPLUG */
|
|
|
|
|
2006-06-23 16:16:38 +08:00
|
|
|
static inline void make_bl(unsigned int *insn_addr, void *func)
|
|
|
|
{
|
|
|
|
unsigned long funcp = *((unsigned long *)func);
|
|
|
|
int offset = funcp - (unsigned long)insn_addr;
|
|
|
|
|
|
|
|
*insn_addr = (unsigned int)(0x48000001 | (offset & 0x03fffffc));
|
|
|
|
flush_icache_range((unsigned long)insn_addr, 4+
|
|
|
|
(unsigned long)insn_addr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __init htab_finish_init(void)
|
|
|
|
{
|
|
|
|
extern unsigned int *htab_call_hpte_insert1;
|
|
|
|
extern unsigned int *htab_call_hpte_insert2;
|
|
|
|
extern unsigned int *htab_call_hpte_remove;
|
|
|
|
extern unsigned int *htab_call_hpte_updatepp;
|
|
|
|
|
2007-05-08 14:27:28 +08:00
|
|
|
#ifdef CONFIG_PPC_HAS_HASH_64K
|
2006-06-23 16:16:38 +08:00
|
|
|
extern unsigned int *ht64_call_hpte_insert1;
|
|
|
|
extern unsigned int *ht64_call_hpte_insert2;
|
|
|
|
extern unsigned int *ht64_call_hpte_remove;
|
|
|
|
extern unsigned int *ht64_call_hpte_updatepp;
|
|
|
|
|
|
|
|
make_bl(ht64_call_hpte_insert1, ppc_md.hpte_insert);
|
|
|
|
make_bl(ht64_call_hpte_insert2, ppc_md.hpte_insert);
|
|
|
|
make_bl(ht64_call_hpte_remove, ppc_md.hpte_remove);
|
|
|
|
make_bl(ht64_call_hpte_updatepp, ppc_md.hpte_updatepp);
|
2007-05-17 02:43:02 +08:00
|
|
|
#endif /* CONFIG_PPC_HAS_HASH_64K */
|
2006-06-23 16:16:38 +08:00
|
|
|
|
|
|
|
make_bl(htab_call_hpte_insert1, ppc_md.hpte_insert);
|
|
|
|
make_bl(htab_call_hpte_insert2, ppc_md.hpte_insert);
|
|
|
|
make_bl(htab_call_hpte_remove, ppc_md.hpte_remove);
|
|
|
|
make_bl(htab_call_hpte_updatepp, ppc_md.hpte_updatepp);
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
void __init htab_initialize(void)
|
|
|
|
{
|
2006-02-21 14:22:55 +08:00
|
|
|
unsigned long table;
|
2005-04-17 06:20:36 +08:00
|
|
|
unsigned long pteg_count;
|
|
|
|
unsigned long mode_rw;
|
|
|
|
unsigned long base = 0, size = 0;
|
2005-11-07 08:06:55 +08:00
|
|
|
int i;
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
extern unsigned long tce_alloc_start, tce_alloc_end;
|
|
|
|
|
|
|
|
DBG(" -> htab_initialize()\n");
|
|
|
|
|
2007-10-11 18:37:10 +08:00
|
|
|
/* Initialize segment sizes */
|
|
|
|
htab_init_seg_sizes();
|
|
|
|
|
2005-11-07 08:06:55 +08:00
|
|
|
/* Initialize page sizes */
|
|
|
|
htab_init_page_sizes();
|
|
|
|
|
2007-10-11 18:37:10 +08:00
|
|
|
if (cpu_has_feature(CPU_FTR_1T_SEGMENT)) {
|
|
|
|
mmu_kernel_ssize = MMU_SEGSIZE_1T;
|
|
|
|
mmu_highuser_ssize = MMU_SEGSIZE_1T;
|
|
|
|
printk(KERN_INFO "Using 1TB segments\n");
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
* Calculate the required size of the htab. We want the number of
|
|
|
|
* PTEGs to equal one half the number of real pages.
|
|
|
|
*/
|
2005-11-07 08:06:55 +08:00
|
|
|
htab_size_bytes = htab_get_table_size();
|
2005-04-17 06:20:36 +08:00
|
|
|
pteg_count = htab_size_bytes >> 7;
|
|
|
|
|
|
|
|
htab_hash_mask = pteg_count - 1;
|
|
|
|
|
2006-03-21 17:45:59 +08:00
|
|
|
if (firmware_has_feature(FW_FEATURE_LPAR)) {
|
2005-04-17 06:20:36 +08:00
|
|
|
/* Using a hypervisor which owns the htab */
|
|
|
|
htab_address = NULL;
|
|
|
|
_SDR1 = 0;
|
|
|
|
} else {
|
|
|
|
/* Find storage for the HPT. Must be contiguous in
|
|
|
|
* the absolute address space.
|
|
|
|
*/
|
|
|
|
table = lmb_alloc(htab_size_bytes, htab_size_bytes);
|
|
|
|
|
|
|
|
DBG("Hash table allocated at %lx, size: %lx\n", table,
|
|
|
|
htab_size_bytes);
|
|
|
|
|
|
|
|
htab_address = abs_to_virt(table);
|
|
|
|
|
|
|
|
/* htab absolute addr + encoded htabsize */
|
|
|
|
_SDR1 = table + __ilog2(pteg_count) - 11;
|
|
|
|
|
|
|
|
/* Initialize the HPT with no entries */
|
|
|
|
memset((void *)table, 0, htab_size_bytes);
|
2005-11-10 10:37:51 +08:00
|
|
|
|
|
|
|
/* Set SDR1 */
|
|
|
|
mtspr(SPRN_SDR1, _SDR1);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2005-06-22 08:15:55 +08:00
|
|
|
mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-04-12 13:30:23 +08:00
|
|
|
#ifdef CONFIG_DEBUG_PAGEALLOC
|
|
|
|
linear_map_hash_count = lmb_end_of_DRAM() >> PAGE_SHIFT;
|
|
|
|
linear_map_hash_slots = __va(lmb_alloc_base(linear_map_hash_count,
|
|
|
|
1, lmb.rmo_size));
|
|
|
|
memset(linear_map_hash_slots, 0, linear_map_hash_count);
|
|
|
|
#endif /* CONFIG_DEBUG_PAGEALLOC */
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/* On U3 based machines, we need to reserve the DART area and
|
|
|
|
* _NOT_ map it to avoid cache paradoxes as it's remapped non
|
|
|
|
* cacheable later on
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* create bolted the linear mapping in the hash table */
|
|
|
|
for (i=0; i < lmb.memory.cnt; i++) {
|
2005-12-06 00:24:33 +08:00
|
|
|
base = (unsigned long)__va(lmb.memory.region[i].base);
|
2005-04-17 06:20:36 +08:00
|
|
|
size = lmb.memory.region[i].size;
|
|
|
|
|
|
|
|
DBG("creating mapping for region: %lx : %lx\n", base, size);
|
|
|
|
|
|
|
|
#ifdef CONFIG_U3_DART
|
|
|
|
/* Do not map the DART space. Fortunately, it will be aligned
|
2005-11-07 08:06:55 +08:00
|
|
|
* in such a way that it will not cross two lmb regions and
|
|
|
|
* will fit within a single 16Mb page.
|
|
|
|
* The DART space is assumed to be a full 16Mb region even if
|
|
|
|
* we only use 2Mb of that space. We will use more of it later
|
|
|
|
* for AGP GART. We have to use a full 16Mb large page.
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
|
|
|
DBG("DART base: %lx\n", dart_tablebase);
|
|
|
|
|
|
|
|
if (dart_tablebase != 0 && dart_tablebase >= base
|
|
|
|
&& dart_tablebase < (base + size)) {
|
2006-03-21 17:45:51 +08:00
|
|
|
unsigned long dart_table_end = dart_tablebase + 16 * MB;
|
2005-04-17 06:20:36 +08:00
|
|
|
if (base != dart_tablebase)
|
2005-11-07 08:06:55 +08:00
|
|
|
BUG_ON(htab_bolt_mapping(base, dart_tablebase,
|
2006-03-21 17:45:51 +08:00
|
|
|
__pa(base), mode_rw,
|
2007-10-11 18:37:10 +08:00
|
|
|
mmu_linear_psize,
|
|
|
|
mmu_kernel_ssize));
|
2006-03-21 17:45:51 +08:00
|
|
|
if ((base + size) > dart_table_end)
|
2005-11-07 08:06:55 +08:00
|
|
|
BUG_ON(htab_bolt_mapping(dart_tablebase+16*MB,
|
2006-03-21 17:45:51 +08:00
|
|
|
base + size,
|
|
|
|
__pa(dart_table_end),
|
2005-11-07 08:06:55 +08:00
|
|
|
mode_rw,
|
2007-10-11 18:37:10 +08:00
|
|
|
mmu_linear_psize,
|
|
|
|
mmu_kernel_ssize));
|
2005-04-17 06:20:36 +08:00
|
|
|
continue;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_U3_DART */
|
2006-03-21 17:45:51 +08:00
|
|
|
BUG_ON(htab_bolt_mapping(base, base + size, __pa(base),
|
2007-10-11 18:37:10 +08:00
|
|
|
mode_rw, mmu_linear_psize, mmu_kernel_ssize));
|
2005-11-07 08:06:55 +08:00
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* If we have a memory_limit and we've allocated TCEs then we need to
|
|
|
|
* explicitly map the TCE area at the top of RAM. We also cope with the
|
|
|
|
* case that the TCEs start below memory_limit.
|
|
|
|
* tce_alloc_start/end are 16MB aligned so the mapping should work
|
|
|
|
* for either 4K or 16MB pages.
|
|
|
|
*/
|
|
|
|
if (tce_alloc_start) {
|
2005-12-06 00:24:33 +08:00
|
|
|
tce_alloc_start = (unsigned long)__va(tce_alloc_start);
|
|
|
|
tce_alloc_end = (unsigned long)__va(tce_alloc_end);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
if (base + size >= tce_alloc_start)
|
|
|
|
tce_alloc_start = base + size + 1;
|
|
|
|
|
2006-03-21 17:45:51 +08:00
|
|
|
BUG_ON(htab_bolt_mapping(tce_alloc_start, tce_alloc_end,
|
|
|
|
__pa(tce_alloc_start), mode_rw,
|
2007-10-11 18:37:10 +08:00
|
|
|
mmu_linear_psize, mmu_kernel_ssize));
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2006-06-23 16:16:38 +08:00
|
|
|
htab_finish_init();
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
DBG(" <- htab_initialize()\n");
|
|
|
|
}
|
|
|
|
#undef KB
|
|
|
|
#undef MB
|
|
|
|
|
2005-12-29 07:46:29 +08:00
|
|
|
void htab_initialize_secondary(void)
|
2005-11-10 10:37:51 +08:00
|
|
|
{
|
2006-03-21 17:45:59 +08:00
|
|
|
if (!firmware_has_feature(FW_FEATURE_LPAR))
|
2005-11-10 10:37:51 +08:00
|
|
|
mtspr(SPRN_SDR1, _SDR1);
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
* Called by asm hashtable.S for doing lazy icache flush
|
|
|
|
*/
|
|
|
|
unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap)
|
|
|
|
{
|
|
|
|
struct page *page;
|
|
|
|
|
2005-11-08 08:21:05 +08:00
|
|
|
if (!pfn_valid(pte_pfn(pte)))
|
|
|
|
return pp;
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
page = pte_page(pte);
|
|
|
|
|
|
|
|
/* page is dirty */
|
|
|
|
if (!test_bit(PG_arch_1, &page->flags) && !PageReserved(page)) {
|
|
|
|
if (trap == 0x400) {
|
|
|
|
__flush_dcache_icache(page_address(page));
|
|
|
|
set_bit(PG_arch_1, &page->flags);
|
|
|
|
} else
|
2005-11-07 08:06:55 +08:00
|
|
|
pp |= HPTE_R_N;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
return pp;
|
|
|
|
}
|
|
|
|
|
[POWERPC] Allow drivers to map individual 4k pages to userspace
Some drivers have resources that they want to be able to map into
userspace that are 4k in size. On a kernel configured with 64k pages
we currently end up mapping the 4k we want plus another 60k of
physical address space, which could contain anything. This can
introduce security problems, for example in the case of an infiniband
adaptor where the other 60k could contain registers that some other
program is using for its communications.
This patch adds a new function, remap_4k_pfn, which drivers can use to
map a single 4k page to userspace regardless of whether the kernel is
using a 4k or a 64k page size. Like remap_pfn_range, it would
typically be called in a driver's mmap function. It only maps a
single 4k page, which on a 64k page kernel appears replicated 16 times
throughout a 64k page. On a 4k page kernel it reduces to a call to
remap_pfn_range.
The way this works on a 64k kernel is that a new bit, _PAGE_4K_PFN,
gets set on the linux PTE. This alters the way that __hash_page_4K
computes the real address to put in the HPTE. The RPN field of the
linux PTE becomes the 4k RPN directly rather than being interpreted as
a 64k RPN. Since the RPN field is 32 bits, this means that physical
addresses being mapped with remap_4k_pfn have to be below 2^44,
i.e. 0x100000000000.
The patch also factors out the code in arch/powerpc/mm/hash_utils_64.c
that deals with demoting a process to use 4k pages into one function
that gets called in the various different places where we need to do
that. There were some discrepancies between exactly what was done in
the various places, such as a call to spu_flush_all_slbs in one case
but not in others.
Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-04-03 19:24:02 +08:00
|
|
|
/*
|
|
|
|
* Demote a segment to using 4k pages.
|
|
|
|
* For now this makes the whole process use 4k pages.
|
|
|
|
*/
|
|
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
2007-05-08 14:27:27 +08:00
|
|
|
static void demote_segment_4k(struct mm_struct *mm, unsigned long addr)
|
|
|
|
{
|
[POWERPC] Allow drivers to map individual 4k pages to userspace
Some drivers have resources that they want to be able to map into
userspace that are 4k in size. On a kernel configured with 64k pages
we currently end up mapping the 4k we want plus another 60k of
physical address space, which could contain anything. This can
introduce security problems, for example in the case of an infiniband
adaptor where the other 60k could contain registers that some other
program is using for its communications.
This patch adds a new function, remap_4k_pfn, which drivers can use to
map a single 4k page to userspace regardless of whether the kernel is
using a 4k or a 64k page size. Like remap_pfn_range, it would
typically be called in a driver's mmap function. It only maps a
single 4k page, which on a 64k page kernel appears replicated 16 times
throughout a 64k page. On a 4k page kernel it reduces to a call to
remap_pfn_range.
The way this works on a 64k kernel is that a new bit, _PAGE_4K_PFN,
gets set on the linux PTE. This alters the way that __hash_page_4K
computes the real address to put in the HPTE. The RPN field of the
linux PTE becomes the 4k RPN directly rather than being interpreted as
a 64k RPN. Since the RPN field is 32 bits, this means that physical
addresses being mapped with remap_4k_pfn have to be below 2^44,
i.e. 0x100000000000.
The patch also factors out the code in arch/powerpc/mm/hash_utils_64.c
that deals with demoting a process to use 4k pages into one function
that gets called in the various different places where we need to do
that. There were some discrepancies between exactly what was done in
the various places, such as a call to spu_flush_all_slbs in one case
but not in others.
Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-04-03 19:24:02 +08:00
|
|
|
if (mm->context.user_psize == MMU_PAGE_4K)
|
|
|
|
return;
|
2007-05-08 14:27:27 +08:00
|
|
|
slice_set_user_psize(mm, MMU_PAGE_4K);
|
2007-07-17 00:35:38 +08:00
|
|
|
#ifdef CONFIG_SPU_BASE
|
[POWERPC] Allow drivers to map individual 4k pages to userspace
Some drivers have resources that they want to be able to map into
userspace that are 4k in size. On a kernel configured with 64k pages
we currently end up mapping the 4k we want plus another 60k of
physical address space, which could contain anything. This can
introduce security problems, for example in the case of an infiniband
adaptor where the other 60k could contain registers that some other
program is using for its communications.
This patch adds a new function, remap_4k_pfn, which drivers can use to
map a single 4k page to userspace regardless of whether the kernel is
using a 4k or a 64k page size. Like remap_pfn_range, it would
typically be called in a driver's mmap function. It only maps a
single 4k page, which on a 64k page kernel appears replicated 16 times
throughout a 64k page. On a 4k page kernel it reduces to a call to
remap_pfn_range.
The way this works on a 64k kernel is that a new bit, _PAGE_4K_PFN,
gets set on the linux PTE. This alters the way that __hash_page_4K
computes the real address to put in the HPTE. The RPN field of the
linux PTE becomes the 4k RPN directly rather than being interpreted as
a 64k RPN. Since the RPN field is 32 bits, this means that physical
addresses being mapped with remap_4k_pfn have to be below 2^44,
i.e. 0x100000000000.
The patch also factors out the code in arch/powerpc/mm/hash_utils_64.c
that deals with demoting a process to use 4k pages into one function
that gets called in the various different places where we need to do
that. There were some discrepancies between exactly what was done in
the various places, such as a call to spu_flush_all_slbs in one case
but not in others.
Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-04-03 19:24:02 +08:00
|
|
|
spu_flush_all_slbs(mm);
|
|
|
|
#endif
|
|
|
|
}
|
2007-05-08 14:27:27 +08:00
|
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
[POWERPC] Allow drivers to map individual 4k pages to userspace
Some drivers have resources that they want to be able to map into
userspace that are 4k in size. On a kernel configured with 64k pages
we currently end up mapping the 4k we want plus another 60k of
physical address space, which could contain anything. This can
introduce security problems, for example in the case of an infiniband
adaptor where the other 60k could contain registers that some other
program is using for its communications.
This patch adds a new function, remap_4k_pfn, which drivers can use to
map a single 4k page to userspace regardless of whether the kernel is
using a 4k or a 64k page size. Like remap_pfn_range, it would
typically be called in a driver's mmap function. It only maps a
single 4k page, which on a 64k page kernel appears replicated 16 times
throughout a 64k page. On a 4k page kernel it reduces to a call to
remap_pfn_range.
The way this works on a 64k kernel is that a new bit, _PAGE_4K_PFN,
gets set on the linux PTE. This alters the way that __hash_page_4K
computes the real address to put in the HPTE. The RPN field of the
linux PTE becomes the 4k RPN directly rather than being interpreted as
a 64k RPN. Since the RPN field is 32 bits, this means that physical
addresses being mapped with remap_4k_pfn have to be below 2^44,
i.e. 0x100000000000.
The patch also factors out the code in arch/powerpc/mm/hash_utils_64.c
that deals with demoting a process to use 4k pages into one function
that gets called in the various different places where we need to do
that. There were some discrepancies between exactly what was done in
the various places, such as a call to spu_flush_all_slbs in one case
but not in others.
Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-04-03 19:24:02 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/* Result code is:
|
|
|
|
* 0 - handled
|
|
|
|
* 1 - normal page fault
|
|
|
|
* -1 - critical hash insertion error
|
|
|
|
*/
|
|
|
|
int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
|
|
|
|
{
|
|
|
|
void *pgdir;
|
|
|
|
unsigned long vsid;
|
|
|
|
struct mm_struct *mm;
|
|
|
|
pte_t *ptep;
|
|
|
|
cpumask_t tmp;
|
2005-11-07 08:06:55 +08:00
|
|
|
int rc, user_region = 0, local = 0;
|
2007-10-11 18:37:10 +08:00
|
|
|
int psize, ssize;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2005-11-07 08:06:55 +08:00
|
|
|
DBG_LOW("hash_page(ea=%016lx, access=%lx, trap=%lx\n",
|
|
|
|
ea, access, trap);
|
2005-05-06 07:15:13 +08:00
|
|
|
|
2005-11-07 08:06:55 +08:00
|
|
|
if ((ea & ~REGION_MASK) >= PGTABLE_RANGE) {
|
|
|
|
DBG_LOW(" out of pgtable range !\n");
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Get region & vsid */
|
2005-04-17 06:20:36 +08:00
|
|
|
switch (REGION_ID(ea)) {
|
|
|
|
case USER_REGION_ID:
|
|
|
|
user_region = 1;
|
|
|
|
mm = current->mm;
|
2005-11-07 08:06:55 +08:00
|
|
|
if (! mm) {
|
|
|
|
DBG_LOW(" user region with no mm !\n");
|
2005-04-17 06:20:36 +08:00
|
|
|
return 1;
|
2005-11-07 08:06:55 +08:00
|
|
|
}
|
2007-05-08 14:27:28 +08:00
|
|
|
#ifdef CONFIG_PPC_MM_SLICES
|
|
|
|
psize = get_slice_psize(mm, ea);
|
|
|
|
#else
|
2006-06-15 08:45:18 +08:00
|
|
|
psize = mm->context.user_psize;
|
2007-05-08 14:27:28 +08:00
|
|
|
#endif
|
2007-10-11 18:37:10 +08:00
|
|
|
ssize = user_segment_size(ea);
|
|
|
|
vsid = get_vsid(mm->context.id, ea, ssize);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
case VMALLOC_REGION_ID:
|
|
|
|
mm = &init_mm;
|
2007-10-11 18:37:10 +08:00
|
|
|
vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
|
2006-06-15 08:45:18 +08:00
|
|
|
if (ea < VMALLOC_END)
|
|
|
|
psize = mmu_vmalloc_psize;
|
|
|
|
else
|
|
|
|
psize = mmu_io_psize;
|
2007-10-11 18:37:10 +08:00
|
|
|
ssize = mmu_kernel_ssize;
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
/* Not a valid range
|
|
|
|
* Send the problem up to do_page_fault
|
|
|
|
*/
|
|
|
|
return 1;
|
|
|
|
}
|
2005-11-07 08:06:55 +08:00
|
|
|
DBG_LOW(" mm=%p, mm->pgdir=%p, vsid=%016lx\n", mm, mm->pgd, vsid);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2005-11-07 08:06:55 +08:00
|
|
|
/* Get pgdir */
|
2005-04-17 06:20:36 +08:00
|
|
|
pgdir = mm->pgd;
|
|
|
|
if (pgdir == NULL)
|
|
|
|
return 1;
|
|
|
|
|
2005-11-07 08:06:55 +08:00
|
|
|
/* Check CPU locality */
|
2005-04-17 06:20:36 +08:00
|
|
|
tmp = cpumask_of_cpu(smp_processor_id());
|
|
|
|
if (user_region && cpus_equal(mm->cpu_vm_mask, tmp))
|
|
|
|
local = 1;
|
|
|
|
|
2007-05-08 14:27:27 +08:00
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
2005-11-07 08:06:55 +08:00
|
|
|
/* Handle hugepage regions */
|
2007-05-08 14:27:28 +08:00
|
|
|
if (HPAGE_SHIFT && psize == mmu_huge_psize) {
|
2005-11-07 08:06:55 +08:00
|
|
|
DBG_LOW(" -> huge page !\n");
|
2005-12-09 11:20:52 +08:00
|
|
|
return hash_huge_page(mm, access, ea, vsid, local, trap);
|
2005-11-07 08:06:55 +08:00
|
|
|
}
|
2007-05-08 14:27:27 +08:00
|
|
|
#endif /* CONFIG_HUGETLB_PAGE */
|
2005-11-07 08:06:55 +08:00
|
|
|
|
2007-05-08 14:27:28 +08:00
|
|
|
#ifndef CONFIG_PPC_64K_PAGES
|
|
|
|
/* If we use 4K pages and our psize is not 4K, then we are hitting
|
|
|
|
* a special driver mapping, we need to align the address before
|
|
|
|
* we fetch the PTE
|
|
|
|
*/
|
|
|
|
if (psize != MMU_PAGE_4K)
|
|
|
|
ea &= ~((1ul << mmu_psize_defs[psize].shift) - 1);
|
|
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
|
|
|
2005-11-07 08:06:55 +08:00
|
|
|
/* Get PTE and page size from page tables */
|
|
|
|
ptep = find_linux_pte(pgdir, ea);
|
|
|
|
if (ptep == NULL || !pte_present(*ptep)) {
|
|
|
|
DBG_LOW(" no PTE !\n");
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifndef CONFIG_PPC_64K_PAGES
|
|
|
|
DBG_LOW(" i-pte: %016lx\n", pte_val(*ptep));
|
|
|
|
#else
|
|
|
|
DBG_LOW(" i-pte: %016lx %016lx\n", pte_val(*ptep),
|
|
|
|
pte_val(*(ptep + PTRS_PER_PTE)));
|
|
|
|
#endif
|
|
|
|
/* Pre-check access permissions (will be re-checked atomically
|
|
|
|
* in __hash_page_XX but this pre-check is a fast path
|
|
|
|
*/
|
|
|
|
if (access & ~pte_val(*ptep)) {
|
|
|
|
DBG_LOW(" no access !\n");
|
|
|
|
return 1;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2005-11-07 08:06:55 +08:00
|
|
|
/* Do actual hashing */
|
2007-05-08 14:27:28 +08:00
|
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
[POWERPC] Allow drivers to map individual 4k pages to userspace
Some drivers have resources that they want to be able to map into
userspace that are 4k in size. On a kernel configured with 64k pages
we currently end up mapping the 4k we want plus another 60k of
physical address space, which could contain anything. This can
introduce security problems, for example in the case of an infiniband
adaptor where the other 60k could contain registers that some other
program is using for its communications.
This patch adds a new function, remap_4k_pfn, which drivers can use to
map a single 4k page to userspace regardless of whether the kernel is
using a 4k or a 64k page size. Like remap_pfn_range, it would
typically be called in a driver's mmap function. It only maps a
single 4k page, which on a 64k page kernel appears replicated 16 times
throughout a 64k page. On a 4k page kernel it reduces to a call to
remap_pfn_range.
The way this works on a 64k kernel is that a new bit, _PAGE_4K_PFN,
gets set on the linux PTE. This alters the way that __hash_page_4K
computes the real address to put in the HPTE. The RPN field of the
linux PTE becomes the 4k RPN directly rather than being interpreted as
a 64k RPN. Since the RPN field is 32 bits, this means that physical
addresses being mapped with remap_4k_pfn have to be below 2^44,
i.e. 0x100000000000.
The patch also factors out the code in arch/powerpc/mm/hash_utils_64.c
that deals with demoting a process to use 4k pages into one function
that gets called in the various different places where we need to do
that. There were some discrepancies between exactly what was done in
the various places, such as a call to spu_flush_all_slbs in one case
but not in others.
Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-04-03 19:24:02 +08:00
|
|
|
/* If _PAGE_4K_PFN is set, make sure this is a 4k segment */
|
|
|
|
if (pte_val(*ptep) & _PAGE_4K_PFN) {
|
|
|
|
demote_segment_4k(mm, ea);
|
|
|
|
psize = MMU_PAGE_4K;
|
|
|
|
}
|
|
|
|
|
2007-05-08 14:27:27 +08:00
|
|
|
/* If this PTE is non-cacheable and we have restrictions on
|
|
|
|
* using non cacheable large pages, then we switch to 4k
|
|
|
|
*/
|
|
|
|
if (mmu_ci_restrictions && psize == MMU_PAGE_64K &&
|
|
|
|
(pte_val(*ptep) & _PAGE_NO_CACHE)) {
|
|
|
|
if (user_region) {
|
|
|
|
demote_segment_4k(mm, ea);
|
|
|
|
psize = MMU_PAGE_4K;
|
|
|
|
} else if (ea < VMALLOC_END) {
|
|
|
|
/*
|
|
|
|
* some driver did a non-cacheable mapping
|
|
|
|
* in vmalloc space, so switch vmalloc
|
|
|
|
* to 4k pages
|
|
|
|
*/
|
|
|
|
printk(KERN_ALERT "Reducing vmalloc segment "
|
|
|
|
"to 4kB pages because of "
|
|
|
|
"non-cacheable mapping\n");
|
|
|
|
psize = mmu_vmalloc_psize = MMU_PAGE_4K;
|
2007-07-17 00:35:38 +08:00
|
|
|
#ifdef CONFIG_SPU_BASE
|
2007-03-10 07:05:37 +08:00
|
|
|
spu_flush_all_slbs(mm);
|
|
|
|
#endif
|
2006-06-15 08:45:18 +08:00
|
|
|
}
|
2007-05-08 14:27:27 +08:00
|
|
|
}
|
|
|
|
if (user_region) {
|
|
|
|
if (psize != get_paca()->context.user_psize) {
|
2007-10-29 09:05:18 +08:00
|
|
|
get_paca()->context = mm->context;
|
2006-06-15 08:45:18 +08:00
|
|
|
slb_flush_and_rebolt();
|
|
|
|
}
|
2007-05-08 14:27:27 +08:00
|
|
|
} else if (get_paca()->vmalloc_sllp !=
|
|
|
|
mmu_psize_defs[mmu_vmalloc_psize].sllp) {
|
|
|
|
get_paca()->vmalloc_sllp =
|
|
|
|
mmu_psize_defs[mmu_vmalloc_psize].sllp;
|
2007-08-03 09:55:39 +08:00
|
|
|
slb_vmalloc_update();
|
2006-06-15 08:45:18 +08:00
|
|
|
}
|
2007-05-08 14:27:28 +08:00
|
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
2007-05-08 14:27:27 +08:00
|
|
|
|
2007-05-08 14:27:28 +08:00
|
|
|
#ifdef CONFIG_PPC_HAS_HASH_64K
|
2006-06-15 08:45:18 +08:00
|
|
|
if (psize == MMU_PAGE_64K)
|
2007-10-11 18:37:10 +08:00
|
|
|
rc = __hash_page_64K(ea, access, vsid, ptep, trap, local, ssize);
|
2005-11-07 08:06:55 +08:00
|
|
|
else
|
2007-05-08 14:27:28 +08:00
|
|
|
#endif /* CONFIG_PPC_HAS_HASH_64K */
|
2007-10-11 18:37:10 +08:00
|
|
|
rc = __hash_page_4K(ea, access, vsid, ptep, trap, local, ssize);
|
2005-11-07 08:06:55 +08:00
|
|
|
|
|
|
|
#ifndef CONFIG_PPC_64K_PAGES
|
|
|
|
DBG_LOW(" o-pte: %016lx\n", pte_val(*ptep));
|
|
|
|
#else
|
|
|
|
DBG_LOW(" o-pte: %016lx %016lx\n", pte_val(*ptep),
|
|
|
|
pte_val(*(ptep + PTRS_PER_PTE)));
|
|
|
|
#endif
|
|
|
|
DBG_LOW(" -> rc=%d\n", rc);
|
|
|
|
return rc;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2005-11-16 04:53:48 +08:00
|
|
|
EXPORT_SYMBOL_GPL(hash_page);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2005-11-07 08:06:55 +08:00
|
|
|
void hash_preload(struct mm_struct *mm, unsigned long ea,
|
|
|
|
unsigned long access, unsigned long trap)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2005-11-07 08:06:55 +08:00
|
|
|
unsigned long vsid;
|
|
|
|
void *pgdir;
|
|
|
|
pte_t *ptep;
|
|
|
|
cpumask_t mask;
|
|
|
|
unsigned long flags;
|
|
|
|
int local = 0;
|
2007-10-11 18:37:10 +08:00
|
|
|
int ssize;
|
2005-11-07 08:06:55 +08:00
|
|
|
|
2007-05-08 14:27:27 +08:00
|
|
|
BUG_ON(REGION_ID(ea) != USER_REGION_ID);
|
|
|
|
|
|
|
|
#ifdef CONFIG_PPC_MM_SLICES
|
|
|
|
/* We only prefault standard pages for now */
|
2007-08-16 06:03:35 +08:00
|
|
|
if (unlikely(get_slice_psize(mm, ea) != mm->context.user_psize))
|
2005-11-07 08:06:55 +08:00
|
|
|
return;
|
2007-05-08 14:27:27 +08:00
|
|
|
#endif
|
2005-11-07 08:06:55 +08:00
|
|
|
|
|
|
|
DBG_LOW("hash_preload(mm=%p, mm->pgdir=%p, ea=%016lx, access=%lx,"
|
|
|
|
" trap=%lx\n", mm, mm->pgd, ea, access, trap);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-05-08 14:27:27 +08:00
|
|
|
/* Get Linux PTE if available */
|
2005-11-07 08:06:55 +08:00
|
|
|
pgdir = mm->pgd;
|
|
|
|
if (pgdir == NULL)
|
|
|
|
return;
|
|
|
|
ptep = find_linux_pte(pgdir, ea);
|
|
|
|
if (!ptep)
|
|
|
|
return;
|
2007-05-08 14:27:27 +08:00
|
|
|
|
|
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
|
|
/* If either _PAGE_4K_PFN or _PAGE_NO_CACHE is set (and we are on
|
|
|
|
* a 64K kernel), then we don't preload, hash_page() will take
|
|
|
|
* care of it once we actually try to access the page.
|
|
|
|
* That way we don't have to duplicate all of the logic for segment
|
|
|
|
* page size demotion here
|
|
|
|
*/
|
|
|
|
if (pte_val(*ptep) & (_PAGE_4K_PFN | _PAGE_NO_CACHE))
|
|
|
|
return;
|
|
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
|
|
|
|
|
|
/* Get VSID */
|
2007-10-11 18:37:10 +08:00
|
|
|
ssize = user_segment_size(ea);
|
|
|
|
vsid = get_vsid(mm->context.id, ea, ssize);
|
2005-11-07 08:06:55 +08:00
|
|
|
|
2007-05-08 14:27:28 +08:00
|
|
|
/* Hash doesn't like irqs */
|
2005-11-07 08:06:55 +08:00
|
|
|
local_irq_save(flags);
|
2007-05-08 14:27:28 +08:00
|
|
|
|
|
|
|
/* Is that local to this CPU ? */
|
2005-11-07 08:06:55 +08:00
|
|
|
mask = cpumask_of_cpu(smp_processor_id());
|
|
|
|
if (cpus_equal(mm->cpu_vm_mask, mask))
|
|
|
|
local = 1;
|
2007-05-08 14:27:28 +08:00
|
|
|
|
|
|
|
/* Hash it in */
|
|
|
|
#ifdef CONFIG_PPC_HAS_HASH_64K
|
2006-06-15 08:45:18 +08:00
|
|
|
if (mm->context.user_psize == MMU_PAGE_64K)
|
2007-10-11 18:37:10 +08:00
|
|
|
__hash_page_64K(ea, access, vsid, ptep, trap, local, ssize);
|
2005-04-17 06:20:36 +08:00
|
|
|
else
|
2007-05-17 02:43:02 +08:00
|
|
|
#endif /* CONFIG_PPC_HAS_HASH_64K */
|
2007-10-11 18:37:10 +08:00
|
|
|
__hash_page_4K(ea, access, vsid, ptep, trap, local, ssize);
|
2007-05-08 14:27:28 +08:00
|
|
|
|
2005-11-07 08:06:55 +08:00
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
2007-10-29 09:05:18 +08:00
|
|
|
/* WARNING: This is called from hash_low_64.S, if you change this prototype,
|
|
|
|
* do not forget to update the assembly call site !
|
|
|
|
*/
|
2007-10-11 18:37:10 +08:00
|
|
|
void flush_hash_page(unsigned long va, real_pte_t pte, int psize, int ssize,
|
|
|
|
int local)
|
2005-11-07 08:06:55 +08:00
|
|
|
{
|
|
|
|
unsigned long hash, index, shift, hidx, slot;
|
|
|
|
|
|
|
|
DBG_LOW("flush_hash_page(va=%016x)\n", va);
|
|
|
|
pte_iterate_hashed_subpages(pte, psize, va, index, shift) {
|
2007-10-11 18:37:10 +08:00
|
|
|
hash = hpt_hash(va, shift, ssize);
|
2005-11-07 08:06:55 +08:00
|
|
|
hidx = __rpte_to_hidx(pte, index);
|
|
|
|
if (hidx & _PTEIDX_SECONDARY)
|
|
|
|
hash = ~hash;
|
|
|
|
slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
|
|
|
|
slot += hidx & _PTEIDX_GROUP_IX;
|
|
|
|
DBG_LOW(" sub %d: hash=%x, hidx=%x\n", index, slot, hidx);
|
2007-10-11 18:37:10 +08:00
|
|
|
ppc_md.hpte_invalidate(slot, va, psize, ssize, local);
|
2005-11-07 08:06:55 +08:00
|
|
|
} pte_iterate_hashed_end();
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2005-09-20 11:52:50 +08:00
|
|
|
void flush_hash_range(unsigned long number, int local)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2005-11-07 08:06:55 +08:00
|
|
|
if (ppc_md.flush_hash_range)
|
2005-09-20 11:52:50 +08:00
|
|
|
ppc_md.flush_hash_range(number, local);
|
2005-11-07 08:06:55 +08:00
|
|
|
else {
|
2005-04-17 06:20:36 +08:00
|
|
|
int i;
|
2005-09-20 11:52:50 +08:00
|
|
|
struct ppc64_tlb_batch *batch =
|
|
|
|
&__get_cpu_var(ppc64_tlb_batch);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
for (i = 0; i < number; i++)
|
2005-11-07 08:06:55 +08:00
|
|
|
flush_hash_page(batch->vaddr[i], batch->pte[i],
|
2007-10-11 18:37:10 +08:00
|
|
|
batch->psize, batch->ssize, local);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* low_hash_fault is called when we the low level hash code failed
|
|
|
|
* to instert a PTE due to an hypervisor error
|
|
|
|
*/
|
|
|
|
void low_hash_fault(struct pt_regs *regs, unsigned long address)
|
|
|
|
{
|
|
|
|
if (user_mode(regs)) {
|
|
|
|
siginfo_t info;
|
|
|
|
|
|
|
|
info.si_signo = SIGBUS;
|
|
|
|
info.si_errno = 0;
|
|
|
|
info.si_code = BUS_ADRERR;
|
|
|
|
info.si_addr = (void __user *)address;
|
|
|
|
force_sig_info(SIGBUS, &info, current);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
bad_page_fault(regs, address, SIGBUS);
|
|
|
|
}
|
2007-04-12 13:30:23 +08:00
|
|
|
|
|
|
|
#ifdef CONFIG_DEBUG_PAGEALLOC
|
|
|
|
static void kernel_map_linear_page(unsigned long vaddr, unsigned long lmi)
|
|
|
|
{
|
2007-10-11 18:37:10 +08:00
|
|
|
unsigned long hash, hpteg;
|
|
|
|
unsigned long vsid = get_kernel_vsid(vaddr, mmu_kernel_ssize);
|
|
|
|
unsigned long va = hpt_va(vaddr, vsid, mmu_kernel_ssize);
|
2007-04-12 13:30:23 +08:00
|
|
|
unsigned long mode = _PAGE_ACCESSED | _PAGE_DIRTY |
|
|
|
|
_PAGE_COHERENT | PP_RWXX | HPTE_R_N;
|
|
|
|
int ret;
|
|
|
|
|
2007-10-11 18:37:10 +08:00
|
|
|
hash = hpt_hash(va, PAGE_SHIFT, mmu_kernel_ssize);
|
2007-04-12 13:30:23 +08:00
|
|
|
hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
|
|
|
|
|
|
|
|
ret = ppc_md.hpte_insert(hpteg, va, __pa(vaddr),
|
2007-10-11 18:37:10 +08:00
|
|
|
mode, HPTE_V_BOLTED,
|
|
|
|
mmu_linear_psize, mmu_kernel_ssize);
|
2007-04-12 13:30:23 +08:00
|
|
|
BUG_ON (ret < 0);
|
|
|
|
spin_lock(&linear_map_hash_lock);
|
|
|
|
BUG_ON(linear_map_hash_slots[lmi] & 0x80);
|
|
|
|
linear_map_hash_slots[lmi] = ret | 0x80;
|
|
|
|
spin_unlock(&linear_map_hash_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void kernel_unmap_linear_page(unsigned long vaddr, unsigned long lmi)
|
|
|
|
{
|
2007-10-11 18:37:10 +08:00
|
|
|
unsigned long hash, hidx, slot;
|
|
|
|
unsigned long vsid = get_kernel_vsid(vaddr, mmu_kernel_ssize);
|
|
|
|
unsigned long va = hpt_va(vaddr, vsid, mmu_kernel_ssize);
|
2007-04-12 13:30:23 +08:00
|
|
|
|
2007-10-11 18:37:10 +08:00
|
|
|
hash = hpt_hash(va, PAGE_SHIFT, mmu_kernel_ssize);
|
2007-04-12 13:30:23 +08:00
|
|
|
spin_lock(&linear_map_hash_lock);
|
|
|
|
BUG_ON(!(linear_map_hash_slots[lmi] & 0x80));
|
|
|
|
hidx = linear_map_hash_slots[lmi] & 0x7f;
|
|
|
|
linear_map_hash_slots[lmi] = 0;
|
|
|
|
spin_unlock(&linear_map_hash_lock);
|
|
|
|
if (hidx & _PTEIDX_SECONDARY)
|
|
|
|
hash = ~hash;
|
|
|
|
slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
|
|
|
|
slot += hidx & _PTEIDX_GROUP_IX;
|
2007-10-11 18:37:10 +08:00
|
|
|
ppc_md.hpte_invalidate(slot, va, mmu_linear_psize, mmu_kernel_ssize, 0);
|
2007-04-12 13:30:23 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
void kernel_map_pages(struct page *page, int numpages, int enable)
|
|
|
|
{
|
|
|
|
unsigned long flags, vaddr, lmi;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
for (i = 0; i < numpages; i++, page++) {
|
|
|
|
vaddr = (unsigned long)page_address(page);
|
|
|
|
lmi = __pa(vaddr) >> PAGE_SHIFT;
|
|
|
|
if (lmi >= linear_map_hash_count)
|
|
|
|
continue;
|
|
|
|
if (enable)
|
|
|
|
kernel_map_linear_page(vaddr, lmi);
|
|
|
|
else
|
|
|
|
kernel_unmap_linear_page(vaddr, lmi);
|
|
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_DEBUG_PAGEALLOC */
|