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dd1842a2a4
Radix and hash MMU models support different page table sizes. Make the #defines a variable so that existing code can work with variable sizes. Slice related code is only used by hash, so use hash constants there. We will replicate some of the boundary conditions with resepct to TASK_SIZE using radix values too. Right now we do boundary condition check using hash constants. Swapper pgdir size is initialized in asm code. We select the max pgd size to keep it simple. For now we select hash pgdir. When adding radix we will switch that to radix pgdir which is 64K. BUILD_BUG_ON check which is removed is already done in hugepage_init() using MAYBE_BUILD_BUG_ON(). Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
1656 lines
44 KiB
C
1656 lines
44 KiB
C
/*
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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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#undef DEBUG_LOW
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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/export.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 <linux/memblock.h>
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#include <linux/context_tracking.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/uaccess.h>
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#include <asm/machdep.h>
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#include <asm/prom.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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#include <asm/copro.h>
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#include <asm/udbg.h>
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#include <asm/code-patching.h>
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#include <asm/fadump.h>
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#include <asm/firmware.h>
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#include <asm/tm.h>
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#include <asm/trace.h>
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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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#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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#define GB (1024L*MB)
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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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static unsigned long _SDR1;
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struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
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EXPORT_SYMBOL_GPL(mmu_psize_defs);
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struct hash_pte *htab_address;
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unsigned long htab_size_bytes;
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unsigned long htab_hash_mask;
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EXPORT_SYMBOL_GPL(htab_hash_mask);
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int mmu_linear_psize = MMU_PAGE_4K;
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EXPORT_SYMBOL_GPL(mmu_linear_psize);
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int mmu_virtual_psize = MMU_PAGE_4K;
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int mmu_vmalloc_psize = MMU_PAGE_4K;
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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int mmu_vmemmap_psize = MMU_PAGE_4K;
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#endif
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int mmu_io_psize = MMU_PAGE_4K;
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int mmu_kernel_ssize = MMU_SEGSIZE_256M;
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EXPORT_SYMBOL_GPL(mmu_kernel_ssize);
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int mmu_highuser_ssize = MMU_SEGSIZE_256M;
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u16 mmu_slb_size = 64;
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EXPORT_SYMBOL_GPL(mmu_slb_size);
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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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#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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static DEFINE_SPINLOCK(linear_map_hash_lock);
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#endif /* CONFIG_DEBUG_PAGEALLOC */
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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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/* Pre-POWER4 CPUs (4k pages only)
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*/
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static 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 = {[MMU_PAGE_4K] = 0, [1 ... MMU_PAGE_COUNT - 1] = -1},
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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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static 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 = {[MMU_PAGE_4K] = 0, [1 ... MMU_PAGE_COUNT - 1] = -1},
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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 ... MMU_PAGE_16M - 1] = -1, [MMU_PAGE_16M] = 0,
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[MMU_PAGE_16M + 1 ... MMU_PAGE_COUNT - 1] = -1 },
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.avpnm = 0x1UL,
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.tlbiel = 0,
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},
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};
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unsigned long htab_convert_pte_flags(unsigned long pteflags)
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{
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unsigned long rflags = 0;
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/* _PAGE_EXEC -> NOEXEC */
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if ((pteflags & _PAGE_EXEC) == 0)
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rflags |= HPTE_R_N;
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/*
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* PPP bits:
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* Linux uses slb key 0 for kernel and 1 for user.
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* kernel RW areas are mapped with PPP=0b000
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* User area is mapped with PPP=0b010 for read/write
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* or PPP=0b011 for read-only (including writeable but clean pages).
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*/
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if (pteflags & _PAGE_PRIVILEGED) {
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/*
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* Kernel read only mapped with ppp bits 0b110
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*/
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if (!(pteflags & _PAGE_WRITE))
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rflags |= (HPTE_R_PP0 | 0x2);
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} else {
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if (pteflags & _PAGE_RWX)
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rflags |= 0x2;
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if (!((pteflags & _PAGE_WRITE) && (pteflags & _PAGE_DIRTY)))
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rflags |= 0x1;
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}
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/*
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* Always add "C" bit for perf. Memory coherence is always enabled
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*/
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rflags |= HPTE_R_C | HPTE_R_M;
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/*
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* Add in WIG bits
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*/
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if ((pteflags & _PAGE_CACHE_CTL) == _PAGE_TOLERANT)
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rflags |= HPTE_R_I;
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if ((pteflags & _PAGE_CACHE_CTL ) == _PAGE_NON_IDEMPOTENT)
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rflags |= (HPTE_R_I | HPTE_R_G);
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if ((pteflags & _PAGE_CACHE_CTL) == _PAGE_SAO)
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rflags |= (HPTE_R_I | HPTE_R_W);
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return rflags;
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}
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int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
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unsigned long pstart, unsigned long prot,
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int psize, int ssize)
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{
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unsigned long vaddr, paddr;
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unsigned int step, shift;
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int ret = 0;
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shift = mmu_psize_defs[psize].shift;
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step = 1 << shift;
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prot = htab_convert_pte_flags(prot);
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DBG("htab_bolt_mapping(%lx..%lx -> %lx (%lx,%d,%d)\n",
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vstart, vend, pstart, prot, psize, ssize);
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for (vaddr = vstart, paddr = pstart; vaddr < vend;
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vaddr += step, paddr += step) {
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unsigned long hash, hpteg;
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unsigned long vsid = get_kernel_vsid(vaddr, ssize);
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unsigned long vpn = hpt_vpn(vaddr, vsid, ssize);
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unsigned long tprot = prot;
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/*
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* If we hit a bad address return error.
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*/
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if (!vsid)
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return -1;
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/* Make kernel text executable */
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if (overlaps_kernel_text(vaddr, vaddr + step))
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tprot &= ~HPTE_R_N;
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/* Make kvm guest trampolines executable */
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if (overlaps_kvm_tmp(vaddr, vaddr + step))
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tprot &= ~HPTE_R_N;
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/*
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* If relocatable, check if it overlaps interrupt vectors that
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* are copied down to real 0. For relocatable kernel
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* (e.g. kdump case) we copy interrupt vectors down to real
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* address 0. Mark that region as executable. This is
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* because on p8 system with relocation on exception feature
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* enabled, exceptions are raised with MMU (IR=DR=1) ON. Hence
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* in order to execute the interrupt handlers in virtual
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* mode the vector region need to be marked as executable.
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*/
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if ((PHYSICAL_START > MEMORY_START) &&
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overlaps_interrupt_vector_text(vaddr, vaddr + step))
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tprot &= ~HPTE_R_N;
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hash = hpt_hash(vpn, shift, ssize);
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hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
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BUG_ON(!ppc_md.hpte_insert);
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ret = ppc_md.hpte_insert(hpteg, vpn, paddr, tprot,
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HPTE_V_BOLTED, psize, psize, ssize);
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if (ret < 0)
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break;
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#ifdef CONFIG_DEBUG_PAGEALLOC
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if (debug_pagealloc_enabled() &&
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(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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}
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return ret < 0 ? ret : 0;
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}
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int htab_remove_mapping(unsigned long vstart, unsigned long vend,
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int psize, int ssize)
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{
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unsigned long vaddr;
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unsigned int step, shift;
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int rc;
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int ret = 0;
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shift = mmu_psize_defs[psize].shift;
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step = 1 << shift;
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if (!ppc_md.hpte_removebolted)
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return -ENODEV;
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for (vaddr = vstart; vaddr < vend; vaddr += step) {
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rc = ppc_md.hpte_removebolted(vaddr, psize, ssize);
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if (rc == -ENOENT) {
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ret = -ENOENT;
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continue;
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}
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if (rc < 0)
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return rc;
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}
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return ret;
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}
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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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const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
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const __be32 *prop;
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int 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 = of_get_flat_dt_prop(node, "ibm,processor-segment-sizes", &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 (be32_to_cpu(prop[0]) == 40) {
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DBG("1T segment support detected\n");
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cur_cpu_spec->mmu_features |= MMU_FTR_1T_SEGMENT;
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return 1;
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}
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}
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cur_cpu_spec->mmu_features &= ~MMU_FTR_NO_SLBIE_B;
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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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static int __init get_idx_from_shift(unsigned int shift)
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{
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int idx = -1;
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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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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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return idx;
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}
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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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const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
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const __be32 *prop;
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int 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 = of_get_flat_dt_prop(node, "ibm,segment-page-sizes", &size);
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if (!prop)
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return 0;
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pr_info("Page sizes from device-tree:\n");
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size /= 4;
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cur_cpu_spec->mmu_features &= ~(MMU_FTR_16M_PAGE);
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while(size > 0) {
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unsigned int base_shift = be32_to_cpu(prop[0]);
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unsigned int slbenc = be32_to_cpu(prop[1]);
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unsigned int lpnum = be32_to_cpu(prop[2]);
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struct mmu_psize_def *def;
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int idx, base_idx;
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size -= 3; prop += 3;
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base_idx = get_idx_from_shift(base_shift);
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if (base_idx < 0) {
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/* skip the pte encoding also */
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prop += lpnum * 2; size -= lpnum * 2;
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continue;
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}
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def = &mmu_psize_defs[base_idx];
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if (base_idx == MMU_PAGE_16M)
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cur_cpu_spec->mmu_features |= MMU_FTR_16M_PAGE;
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def->shift = base_shift;
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if (base_shift <= 23)
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def->avpnm = 0;
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else
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def->avpnm = (1 << (base_shift - 23)) - 1;
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def->sllp = slbenc;
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/*
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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 (base_idx == MMU_PAGE_4K || base_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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while (size > 0 && lpnum) {
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unsigned int shift = be32_to_cpu(prop[0]);
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int penc = be32_to_cpu(prop[1]);
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prop += 2; size -= 2;
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lpnum--;
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idx = get_idx_from_shift(shift);
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if (idx < 0)
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continue;
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if (penc == -1)
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pr_err("Invalid penc for base_shift=%d "
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"shift=%d\n", base_shift, shift);
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def->penc[idx] = penc;
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pr_info("base_shift=%d: shift=%d, sllp=0x%04lx,"
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" avpnm=0x%08lx, tlbiel=%d, penc=%d\n",
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base_shift, shift, def->sllp,
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def->avpnm, def->tlbiel, def->penc[idx]);
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}
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}
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return 1;
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}
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#ifdef CONFIG_HUGETLB_PAGE
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/* Scan for 16G memory blocks that have been set aside for huge pages
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* and reserve those blocks for 16G huge pages.
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*/
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static int __init htab_dt_scan_hugepage_blocks(unsigned long node,
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const char *uname, int depth,
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void *data) {
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const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
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const __be64 *addr_prop;
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const __be32 *page_count_prop;
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unsigned int expected_pages;
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long unsigned int phys_addr;
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long unsigned int block_size;
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/* We are scanning "memory" nodes only */
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if (type == NULL || strcmp(type, "memory") != 0)
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return 0;
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/* This property is the log base 2 of the number of virtual pages that
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* will represent this memory block. */
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page_count_prop = of_get_flat_dt_prop(node, "ibm,expected#pages", NULL);
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if (page_count_prop == NULL)
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return 0;
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expected_pages = (1 << be32_to_cpu(page_count_prop[0]));
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addr_prop = of_get_flat_dt_prop(node, "reg", NULL);
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if (addr_prop == NULL)
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return 0;
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phys_addr = be64_to_cpu(addr_prop[0]);
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block_size = be64_to_cpu(addr_prop[1]);
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if (block_size != (16 * GB))
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return 0;
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printk(KERN_INFO "Huge page(16GB) memory: "
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"addr = 0x%lX size = 0x%lX pages = %d\n",
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phys_addr, block_size, expected_pages);
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if (phys_addr + (16 * GB) <= memblock_end_of_DRAM()) {
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memblock_reserve(phys_addr, block_size * expected_pages);
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add_gpage(phys_addr, block_size, expected_pages);
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}
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return 0;
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}
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#endif /* CONFIG_HUGETLB_PAGE */
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|
|
static void mmu_psize_set_default_penc(void)
|
|
{
|
|
int bpsize, apsize;
|
|
for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++)
|
|
for (apsize = 0; apsize < MMU_PAGE_COUNT; apsize++)
|
|
mmu_psize_defs[bpsize].penc[apsize] = -1;
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
|
|
static bool might_have_hea(void)
|
|
{
|
|
/*
|
|
* The HEA ethernet adapter requires awareness of the
|
|
* GX bus. Without that awareness we can easily assume
|
|
* we will never see an HEA ethernet device.
|
|
*/
|
|
#ifdef CONFIG_IBMEBUS
|
|
return !cpu_has_feature(CPU_FTR_ARCH_207S);
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
#endif /* #ifdef CONFIG_PPC_64K_PAGES */
|
|
|
|
static void __init htab_init_page_sizes(void)
|
|
{
|
|
int rc;
|
|
|
|
/* se the invalid penc to -1 */
|
|
mmu_psize_set_default_penc();
|
|
|
|
/* Default to 4K pages only */
|
|
memcpy(mmu_psize_defs, mmu_psize_defaults_old,
|
|
sizeof(mmu_psize_defaults_old));
|
|
|
|
/*
|
|
* Try to find the available page sizes in the device-tree
|
|
*/
|
|
rc = of_scan_flat_dt(htab_dt_scan_page_sizes, NULL);
|
|
if (rc != 0) /* Found */
|
|
goto found;
|
|
|
|
/*
|
|
* Not in the device-tree, let's fallback on known size
|
|
* list for 16M capable GP & GR
|
|
*/
|
|
if (mmu_has_feature(MMU_FTR_16M_PAGE))
|
|
memcpy(mmu_psize_defs, mmu_psize_defaults_gp,
|
|
sizeof(mmu_psize_defaults_gp));
|
|
found:
|
|
if (!debug_pagealloc_enabled()) {
|
|
/*
|
|
* Pick a size for the linear mapping. Currently, we only
|
|
* support 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;
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
/*
|
|
* Pick a size for the ordinary pages. Default is 4K, we support
|
|
* 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.
|
|
*/
|
|
if (mmu_psize_defs[MMU_PAGE_64K].shift) {
|
|
mmu_virtual_psize = MMU_PAGE_64K;
|
|
mmu_vmalloc_psize = MMU_PAGE_64K;
|
|
if (mmu_linear_psize == MMU_PAGE_4K)
|
|
mmu_linear_psize = MMU_PAGE_64K;
|
|
if (mmu_has_feature(MMU_FTR_CI_LARGE_PAGE)) {
|
|
/*
|
|
* When running on pSeries using 64k pages for ioremap
|
|
* would stop us accessing the HEA ethernet. So if we
|
|
* have the chance of ever seeing one, stay at 4k.
|
|
*/
|
|
if (!might_have_hea() || !machine_is(pseries))
|
|
mmu_io_psize = MMU_PAGE_64K;
|
|
} else
|
|
mmu_ci_restrictions = 1;
|
|
}
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
/* We try to use 16M pages for vmemmap if that is supported
|
|
* and we have at least 1G of RAM at boot
|
|
*/
|
|
if (mmu_psize_defs[MMU_PAGE_16M].shift &&
|
|
memblock_phys_mem_size() >= 0x40000000)
|
|
mmu_vmemmap_psize = MMU_PAGE_16M;
|
|
else if (mmu_psize_defs[MMU_PAGE_64K].shift)
|
|
mmu_vmemmap_psize = MMU_PAGE_64K;
|
|
else
|
|
mmu_vmemmap_psize = MMU_PAGE_4K;
|
|
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
|
|
|
|
printk(KERN_DEBUG "Page orders: linear mapping = %d, "
|
|
"virtual = %d, io = %d"
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
", vmemmap = %d"
|
|
#endif
|
|
"\n",
|
|
mmu_psize_defs[mmu_linear_psize].shift,
|
|
mmu_psize_defs[mmu_virtual_psize].shift,
|
|
mmu_psize_defs[mmu_io_psize].shift
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
,mmu_psize_defs[mmu_vmemmap_psize].shift
|
|
#endif
|
|
);
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
/* Reserve 16G huge page memory sections for huge pages */
|
|
of_scan_flat_dt(htab_dt_scan_hugepage_blocks, NULL);
|
|
#endif /* CONFIG_HUGETLB_PAGE */
|
|
}
|
|
|
|
static int __init htab_dt_scan_pftsize(unsigned long node,
|
|
const char *uname, int depth,
|
|
void *data)
|
|
{
|
|
const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
|
|
const __be32 *prop;
|
|
|
|
/* We are scanning "cpu" nodes only */
|
|
if (type == NULL || strcmp(type, "cpu") != 0)
|
|
return 0;
|
|
|
|
prop = of_get_flat_dt_prop(node, "ibm,pft-size", NULL);
|
|
if (prop != NULL) {
|
|
/* pft_size[0] is the NUMA CEC cookie */
|
|
ppc64_pft_size = be32_to_cpu(prop[1]);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
unsigned htab_shift_for_mem_size(unsigned long mem_size)
|
|
{
|
|
unsigned memshift = __ilog2(mem_size);
|
|
unsigned pshift = mmu_psize_defs[mmu_virtual_psize].shift;
|
|
unsigned pteg_shift;
|
|
|
|
/* round mem_size up to next power of 2 */
|
|
if ((1UL << memshift) < mem_size)
|
|
memshift += 1;
|
|
|
|
/* aim for 2 pages / pteg */
|
|
pteg_shift = memshift - (pshift + 1);
|
|
|
|
/*
|
|
* 2^11 PTEGS of 128 bytes each, ie. 2^18 bytes is the minimum htab
|
|
* size permitted by the architecture.
|
|
*/
|
|
return max(pteg_shift + 7, 18U);
|
|
}
|
|
|
|
static unsigned long __init htab_get_table_size(void)
|
|
{
|
|
/* If hash size isn't already provided by the platform, we try to
|
|
* retrieve it from the device-tree. If it's not there neither, we
|
|
* calculate it now based on the total RAM size
|
|
*/
|
|
if (ppc64_pft_size == 0)
|
|
of_scan_flat_dt(htab_dt_scan_pftsize, NULL);
|
|
if (ppc64_pft_size)
|
|
return 1UL << ppc64_pft_size;
|
|
|
|
return 1UL << htab_shift_for_mem_size(memblock_phys_mem_size());
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
int create_section_mapping(unsigned long start, unsigned long end)
|
|
{
|
|
int rc = htab_bolt_mapping(start, end, __pa(start),
|
|
pgprot_val(PAGE_KERNEL), mmu_linear_psize,
|
|
mmu_kernel_ssize);
|
|
|
|
if (rc < 0) {
|
|
int rc2 = htab_remove_mapping(start, end, mmu_linear_psize,
|
|
mmu_kernel_ssize);
|
|
BUG_ON(rc2 && (rc2 != -ENOENT));
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int remove_section_mapping(unsigned long start, unsigned long end)
|
|
{
|
|
int rc = htab_remove_mapping(start, end, mmu_linear_psize,
|
|
mmu_kernel_ssize);
|
|
WARN_ON(rc < 0);
|
|
return rc;
|
|
}
|
|
#endif /* CONFIG_MEMORY_HOTPLUG */
|
|
|
|
static void __init hash_init_partition_table(phys_addr_t hash_table,
|
|
unsigned long pteg_count)
|
|
{
|
|
unsigned long ps_field;
|
|
unsigned long htab_size;
|
|
unsigned long patb_size = 1UL << PATB_SIZE_SHIFT;
|
|
|
|
/*
|
|
* slb llp encoding for the page size used in VPM real mode.
|
|
* We can ignore that for lpid 0
|
|
*/
|
|
ps_field = 0;
|
|
htab_size = __ilog2(pteg_count) - 11;
|
|
|
|
BUILD_BUG_ON_MSG((PATB_SIZE_SHIFT > 24), "Partition table size too large.");
|
|
partition_tb = __va(memblock_alloc_base(patb_size, patb_size,
|
|
MEMBLOCK_ALLOC_ANYWHERE));
|
|
|
|
/* Initialize the Partition Table with no entries */
|
|
memset((void *)partition_tb, 0, patb_size);
|
|
partition_tb->patb0 = cpu_to_be64(ps_field | hash_table | htab_size);
|
|
/*
|
|
* FIXME!! This should be done via update_partition table
|
|
* For now UPRT is 0 for us.
|
|
*/
|
|
partition_tb->patb1 = 0;
|
|
DBG("Partition table %p\n", partition_tb);
|
|
/*
|
|
* update partition table control register,
|
|
* 64 K size.
|
|
*/
|
|
mtspr(SPRN_PTCR, __pa(partition_tb) | (PATB_SIZE_SHIFT - 12));
|
|
|
|
}
|
|
|
|
static void __init htab_initialize(void)
|
|
{
|
|
unsigned long table;
|
|
unsigned long pteg_count;
|
|
unsigned long prot;
|
|
unsigned long base = 0, size = 0, limit;
|
|
struct memblock_region *reg;
|
|
|
|
DBG(" -> htab_initialize()\n");
|
|
|
|
/* Initialize segment sizes */
|
|
htab_init_seg_sizes();
|
|
|
|
/* Initialize page sizes */
|
|
htab_init_page_sizes();
|
|
|
|
if (mmu_has_feature(MMU_FTR_1T_SEGMENT)) {
|
|
mmu_kernel_ssize = MMU_SEGSIZE_1T;
|
|
mmu_highuser_ssize = MMU_SEGSIZE_1T;
|
|
printk(KERN_INFO "Using 1TB segments\n");
|
|
}
|
|
|
|
/*
|
|
* Calculate the required size of the htab. We want the number of
|
|
* PTEGs to equal one half the number of real pages.
|
|
*/
|
|
htab_size_bytes = htab_get_table_size();
|
|
pteg_count = htab_size_bytes >> 7;
|
|
|
|
htab_hash_mask = pteg_count - 1;
|
|
|
|
if (firmware_has_feature(FW_FEATURE_LPAR)) {
|
|
/* Using a hypervisor which owns the htab */
|
|
htab_address = NULL;
|
|
_SDR1 = 0;
|
|
#ifdef CONFIG_FA_DUMP
|
|
/*
|
|
* If firmware assisted dump is active firmware preserves
|
|
* the contents of htab along with entire partition memory.
|
|
* Clear the htab if firmware assisted dump is active so
|
|
* that we dont end up using old mappings.
|
|
*/
|
|
if (is_fadump_active() && ppc_md.hpte_clear_all)
|
|
ppc_md.hpte_clear_all();
|
|
#endif
|
|
} else {
|
|
/* Find storage for the HPT. Must be contiguous in
|
|
* the absolute address space. On cell we want it to be
|
|
* in the first 2 Gig so we can use it for IOMMU hacks.
|
|
*/
|
|
if (machine_is(cell))
|
|
limit = 0x80000000;
|
|
else
|
|
limit = MEMBLOCK_ALLOC_ANYWHERE;
|
|
|
|
table = memblock_alloc_base(htab_size_bytes, htab_size_bytes, limit);
|
|
|
|
DBG("Hash table allocated at %lx, size: %lx\n", table,
|
|
htab_size_bytes);
|
|
|
|
htab_address = __va(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);
|
|
|
|
if (!cpu_has_feature(CPU_FTR_ARCH_300))
|
|
/* Set SDR1 */
|
|
mtspr(SPRN_SDR1, _SDR1);
|
|
else
|
|
hash_init_partition_table(table, pteg_count);
|
|
}
|
|
|
|
prot = pgprot_val(PAGE_KERNEL);
|
|
|
|
#ifdef CONFIG_DEBUG_PAGEALLOC
|
|
if (debug_pagealloc_enabled()) {
|
|
linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
|
|
linear_map_hash_slots = __va(memblock_alloc_base(
|
|
linear_map_hash_count, 1, ppc64_rma_size));
|
|
memset(linear_map_hash_slots, 0, linear_map_hash_count);
|
|
}
|
|
#endif /* CONFIG_DEBUG_PAGEALLOC */
|
|
|
|
/* 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_each_memblock(memory, reg) {
|
|
base = (unsigned long)__va(reg->base);
|
|
size = reg->size;
|
|
|
|
DBG("creating mapping for region: %lx..%lx (prot: %lx)\n",
|
|
base, size, prot);
|
|
|
|
#ifdef CONFIG_U3_DART
|
|
/* Do not map the DART space. Fortunately, it will be aligned
|
|
* in such a way that it will not cross two memblock 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.
|
|
*/
|
|
DBG("DART base: %lx\n", dart_tablebase);
|
|
|
|
if (dart_tablebase != 0 && dart_tablebase >= base
|
|
&& dart_tablebase < (base + size)) {
|
|
unsigned long dart_table_end = dart_tablebase + 16 * MB;
|
|
if (base != dart_tablebase)
|
|
BUG_ON(htab_bolt_mapping(base, dart_tablebase,
|
|
__pa(base), prot,
|
|
mmu_linear_psize,
|
|
mmu_kernel_ssize));
|
|
if ((base + size) > dart_table_end)
|
|
BUG_ON(htab_bolt_mapping(dart_tablebase+16*MB,
|
|
base + size,
|
|
__pa(dart_table_end),
|
|
prot,
|
|
mmu_linear_psize,
|
|
mmu_kernel_ssize));
|
|
continue;
|
|
}
|
|
#endif /* CONFIG_U3_DART */
|
|
BUG_ON(htab_bolt_mapping(base, base + size, __pa(base),
|
|
prot, mmu_linear_psize, mmu_kernel_ssize));
|
|
}
|
|
memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE);
|
|
|
|
/*
|
|
* 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) {
|
|
tce_alloc_start = (unsigned long)__va(tce_alloc_start);
|
|
tce_alloc_end = (unsigned long)__va(tce_alloc_end);
|
|
|
|
if (base + size >= tce_alloc_start)
|
|
tce_alloc_start = base + size + 1;
|
|
|
|
BUG_ON(htab_bolt_mapping(tce_alloc_start, tce_alloc_end,
|
|
__pa(tce_alloc_start), prot,
|
|
mmu_linear_psize, mmu_kernel_ssize));
|
|
}
|
|
|
|
|
|
DBG(" <- htab_initialize()\n");
|
|
}
|
|
#undef KB
|
|
#undef MB
|
|
|
|
void __init early_init_mmu(void)
|
|
{
|
|
/*
|
|
* initialize page table size
|
|
*/
|
|
__pte_index_size = H_PTE_INDEX_SIZE;
|
|
__pmd_index_size = H_PMD_INDEX_SIZE;
|
|
__pud_index_size = H_PUD_INDEX_SIZE;
|
|
__pgd_index_size = H_PGD_INDEX_SIZE;
|
|
__pmd_cache_index = H_PMD_CACHE_INDEX;
|
|
__pte_table_size = H_PTE_TABLE_SIZE;
|
|
__pmd_table_size = H_PMD_TABLE_SIZE;
|
|
__pud_table_size = H_PUD_TABLE_SIZE;
|
|
__pgd_table_size = H_PGD_TABLE_SIZE;
|
|
/* Initialize the MMU Hash table and create the linear mapping
|
|
* of memory. Has to be done before SLB initialization as this is
|
|
* currently where the page size encoding is obtained.
|
|
*/
|
|
htab_initialize();
|
|
|
|
/* Initialize SLB management */
|
|
slb_initialize();
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
void early_init_mmu_secondary(void)
|
|
{
|
|
/* Initialize hash table for that CPU */
|
|
if (!firmware_has_feature(FW_FEATURE_LPAR))
|
|
mtspr(SPRN_SDR1, _SDR1);
|
|
|
|
/* Initialize SLB */
|
|
slb_initialize();
|
|
}
|
|
#endif /* CONFIG_SMP */
|
|
|
|
/*
|
|
* 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;
|
|
|
|
if (!pfn_valid(pte_pfn(pte)))
|
|
return pp;
|
|
|
|
page = pte_page(pte);
|
|
|
|
/* page is dirty */
|
|
if (!test_bit(PG_arch_1, &page->flags) && !PageReserved(page)) {
|
|
if (trap == 0x400) {
|
|
flush_dcache_icache_page(page);
|
|
set_bit(PG_arch_1, &page->flags);
|
|
} else
|
|
pp |= HPTE_R_N;
|
|
}
|
|
return pp;
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_MM_SLICES
|
|
static unsigned int get_paca_psize(unsigned long addr)
|
|
{
|
|
u64 lpsizes;
|
|
unsigned char *hpsizes;
|
|
unsigned long index, mask_index;
|
|
|
|
if (addr < SLICE_LOW_TOP) {
|
|
lpsizes = get_paca()->mm_ctx_low_slices_psize;
|
|
index = GET_LOW_SLICE_INDEX(addr);
|
|
return (lpsizes >> (index * 4)) & 0xF;
|
|
}
|
|
hpsizes = get_paca()->mm_ctx_high_slices_psize;
|
|
index = GET_HIGH_SLICE_INDEX(addr);
|
|
mask_index = index & 0x1;
|
|
return (hpsizes[index >> 1] >> (mask_index * 4)) & 0xF;
|
|
}
|
|
|
|
#else
|
|
unsigned int get_paca_psize(unsigned long addr)
|
|
{
|
|
return get_paca()->mm_ctx_user_psize;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Demote a segment to using 4k pages.
|
|
* For now this makes the whole process use 4k pages.
|
|
*/
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
void demote_segment_4k(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
if (get_slice_psize(mm, addr) == MMU_PAGE_4K)
|
|
return;
|
|
slice_set_range_psize(mm, addr, 1, MMU_PAGE_4K);
|
|
copro_flush_all_slbs(mm);
|
|
if ((get_paca_psize(addr) != MMU_PAGE_4K) && (current->mm == mm)) {
|
|
|
|
copy_mm_to_paca(&mm->context);
|
|
slb_flush_and_rebolt();
|
|
}
|
|
}
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
|
|
#ifdef CONFIG_PPC_SUBPAGE_PROT
|
|
/*
|
|
* This looks up a 2-bit protection code for a 4k subpage of a 64k page.
|
|
* Userspace sets the subpage permissions using the subpage_prot system call.
|
|
*
|
|
* Result is 0: full permissions, _PAGE_RW: read-only,
|
|
* _PAGE_RWX: no access.
|
|
*/
|
|
static int subpage_protection(struct mm_struct *mm, unsigned long ea)
|
|
{
|
|
struct subpage_prot_table *spt = &mm->context.spt;
|
|
u32 spp = 0;
|
|
u32 **sbpm, *sbpp;
|
|
|
|
if (ea >= spt->maxaddr)
|
|
return 0;
|
|
if (ea < 0x100000000UL) {
|
|
/* addresses below 4GB use spt->low_prot */
|
|
sbpm = spt->low_prot;
|
|
} else {
|
|
sbpm = spt->protptrs[ea >> SBP_L3_SHIFT];
|
|
if (!sbpm)
|
|
return 0;
|
|
}
|
|
sbpp = sbpm[(ea >> SBP_L2_SHIFT) & (SBP_L2_COUNT - 1)];
|
|
if (!sbpp)
|
|
return 0;
|
|
spp = sbpp[(ea >> PAGE_SHIFT) & (SBP_L1_COUNT - 1)];
|
|
|
|
/* extract 2-bit bitfield for this 4k subpage */
|
|
spp >>= 30 - 2 * ((ea >> 12) & 0xf);
|
|
|
|
/*
|
|
* 0 -> full premission
|
|
* 1 -> Read only
|
|
* 2 -> no access.
|
|
* We return the flag that need to be cleared.
|
|
*/
|
|
spp = ((spp & 2) ? _PAGE_RWX : 0) | ((spp & 1) ? _PAGE_WRITE : 0);
|
|
return spp;
|
|
}
|
|
|
|
#else /* CONFIG_PPC_SUBPAGE_PROT */
|
|
static inline int subpage_protection(struct mm_struct *mm, unsigned long ea)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
void hash_failure_debug(unsigned long ea, unsigned long access,
|
|
unsigned long vsid, unsigned long trap,
|
|
int ssize, int psize, int lpsize, unsigned long pte)
|
|
{
|
|
if (!printk_ratelimit())
|
|
return;
|
|
pr_info("mm: Hashing failure ! EA=0x%lx access=0x%lx current=%s\n",
|
|
ea, access, current->comm);
|
|
pr_info(" trap=0x%lx vsid=0x%lx ssize=%d base psize=%d psize %d pte=0x%lx\n",
|
|
trap, vsid, ssize, psize, lpsize, pte);
|
|
}
|
|
|
|
static void check_paca_psize(unsigned long ea, struct mm_struct *mm,
|
|
int psize, bool user_region)
|
|
{
|
|
if (user_region) {
|
|
if (psize != get_paca_psize(ea)) {
|
|
copy_mm_to_paca(&mm->context);
|
|
slb_flush_and_rebolt();
|
|
}
|
|
} else if (get_paca()->vmalloc_sllp !=
|
|
mmu_psize_defs[mmu_vmalloc_psize].sllp) {
|
|
get_paca()->vmalloc_sllp =
|
|
mmu_psize_defs[mmu_vmalloc_psize].sllp;
|
|
slb_vmalloc_update();
|
|
}
|
|
}
|
|
|
|
/* Result code is:
|
|
* 0 - handled
|
|
* 1 - normal page fault
|
|
* -1 - critical hash insertion error
|
|
* -2 - access not permitted by subpage protection mechanism
|
|
*/
|
|
int hash_page_mm(struct mm_struct *mm, unsigned long ea,
|
|
unsigned long access, unsigned long trap,
|
|
unsigned long flags)
|
|
{
|
|
bool is_thp;
|
|
enum ctx_state prev_state = exception_enter();
|
|
pgd_t *pgdir;
|
|
unsigned long vsid;
|
|
pte_t *ptep;
|
|
unsigned hugeshift;
|
|
const struct cpumask *tmp;
|
|
int rc, user_region = 0;
|
|
int psize, ssize;
|
|
|
|
DBG_LOW("hash_page(ea=%016lx, access=%lx, trap=%lx\n",
|
|
ea, access, trap);
|
|
trace_hash_fault(ea, access, trap);
|
|
|
|
/* Get region & vsid */
|
|
switch (REGION_ID(ea)) {
|
|
case USER_REGION_ID:
|
|
user_region = 1;
|
|
if (! mm) {
|
|
DBG_LOW(" user region with no mm !\n");
|
|
rc = 1;
|
|
goto bail;
|
|
}
|
|
psize = get_slice_psize(mm, ea);
|
|
ssize = user_segment_size(ea);
|
|
vsid = get_vsid(mm->context.id, ea, ssize);
|
|
break;
|
|
case VMALLOC_REGION_ID:
|
|
vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
|
|
if (ea < VMALLOC_END)
|
|
psize = mmu_vmalloc_psize;
|
|
else
|
|
psize = mmu_io_psize;
|
|
ssize = mmu_kernel_ssize;
|
|
break;
|
|
default:
|
|
/* Not a valid range
|
|
* Send the problem up to do_page_fault
|
|
*/
|
|
rc = 1;
|
|
goto bail;
|
|
}
|
|
DBG_LOW(" mm=%p, mm->pgdir=%p, vsid=%016lx\n", mm, mm->pgd, vsid);
|
|
|
|
/* Bad address. */
|
|
if (!vsid) {
|
|
DBG_LOW("Bad address!\n");
|
|
rc = 1;
|
|
goto bail;
|
|
}
|
|
/* Get pgdir */
|
|
pgdir = mm->pgd;
|
|
if (pgdir == NULL) {
|
|
rc = 1;
|
|
goto bail;
|
|
}
|
|
|
|
/* Check CPU locality */
|
|
tmp = cpumask_of(smp_processor_id());
|
|
if (user_region && cpumask_equal(mm_cpumask(mm), tmp))
|
|
flags |= HPTE_LOCAL_UPDATE;
|
|
|
|
#ifndef CONFIG_PPC_64K_PAGES
|
|
/* If we use 4K pages and our psize is not 4K, then we might
|
|
* be hitting a special driver mapping, and need to align the
|
|
* address before we fetch the PTE.
|
|
*
|
|
* It could also be a hugepage mapping, in which case this is
|
|
* not necessary, but it's not harmful, either.
|
|
*/
|
|
if (psize != MMU_PAGE_4K)
|
|
ea &= ~((1ul << mmu_psize_defs[psize].shift) - 1);
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
|
|
/* Get PTE and page size from page tables */
|
|
ptep = __find_linux_pte_or_hugepte(pgdir, ea, &is_thp, &hugeshift);
|
|
if (ptep == NULL || !pte_present(*ptep)) {
|
|
DBG_LOW(" no PTE !\n");
|
|
rc = 1;
|
|
goto bail;
|
|
}
|
|
|
|
/* Add _PAGE_PRESENT to the required access perm */
|
|
access |= _PAGE_PRESENT;
|
|
|
|
/* Pre-check access permissions (will be re-checked atomically
|
|
* in __hash_page_XX but this pre-check is a fast path
|
|
*/
|
|
if (!check_pte_access(access, pte_val(*ptep))) {
|
|
DBG_LOW(" no access !\n");
|
|
rc = 1;
|
|
goto bail;
|
|
}
|
|
|
|
if (hugeshift) {
|
|
if (is_thp)
|
|
rc = __hash_page_thp(ea, access, vsid, (pmd_t *)ptep,
|
|
trap, flags, ssize, psize);
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
else
|
|
rc = __hash_page_huge(ea, access, vsid, ptep, trap,
|
|
flags, ssize, hugeshift, psize);
|
|
#else
|
|
else {
|
|
/*
|
|
* if we have hugeshift, and is not transhuge with
|
|
* hugetlb disabled, something is really wrong.
|
|
*/
|
|
rc = 1;
|
|
WARN_ON(1);
|
|
}
|
|
#endif
|
|
if (current->mm == mm)
|
|
check_paca_psize(ea, mm, psize, user_region);
|
|
|
|
goto bail;
|
|
}
|
|
|
|
#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
|
|
/* Do actual hashing */
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
/* If H_PAGE_4K_PFN is set, make sure this is a 4k segment */
|
|
if ((pte_val(*ptep) & H_PAGE_4K_PFN) && psize == MMU_PAGE_64K) {
|
|
demote_segment_4k(mm, ea);
|
|
psize = MMU_PAGE_4K;
|
|
}
|
|
|
|
/* 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_ci(*ptep)) {
|
|
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;
|
|
copro_flush_all_slbs(mm);
|
|
}
|
|
}
|
|
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
|
|
if (current->mm == mm)
|
|
check_paca_psize(ea, mm, psize, user_region);
|
|
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
if (psize == MMU_PAGE_64K)
|
|
rc = __hash_page_64K(ea, access, vsid, ptep, trap,
|
|
flags, ssize);
|
|
else
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
{
|
|
int spp = subpage_protection(mm, ea);
|
|
if (access & spp)
|
|
rc = -2;
|
|
else
|
|
rc = __hash_page_4K(ea, access, vsid, ptep, trap,
|
|
flags, ssize, spp);
|
|
}
|
|
|
|
/* Dump some info in case of hash insertion failure, they should
|
|
* never happen so it is really useful to know if/when they do
|
|
*/
|
|
if (rc == -1)
|
|
hash_failure_debug(ea, access, vsid, trap, ssize, psize,
|
|
psize, pte_val(*ptep));
|
|
#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);
|
|
|
|
bail:
|
|
exception_exit(prev_state);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hash_page_mm);
|
|
|
|
int hash_page(unsigned long ea, unsigned long access, unsigned long trap,
|
|
unsigned long dsisr)
|
|
{
|
|
unsigned long flags = 0;
|
|
struct mm_struct *mm = current->mm;
|
|
|
|
if (REGION_ID(ea) == VMALLOC_REGION_ID)
|
|
mm = &init_mm;
|
|
|
|
if (dsisr & DSISR_NOHPTE)
|
|
flags |= HPTE_NOHPTE_UPDATE;
|
|
|
|
return hash_page_mm(mm, ea, access, trap, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hash_page);
|
|
|
|
int __hash_page(unsigned long ea, unsigned long msr, unsigned long trap,
|
|
unsigned long dsisr)
|
|
{
|
|
unsigned long access = _PAGE_PRESENT | _PAGE_READ;
|
|
unsigned long flags = 0;
|
|
struct mm_struct *mm = current->mm;
|
|
|
|
if (REGION_ID(ea) == VMALLOC_REGION_ID)
|
|
mm = &init_mm;
|
|
|
|
if (dsisr & DSISR_NOHPTE)
|
|
flags |= HPTE_NOHPTE_UPDATE;
|
|
|
|
if (dsisr & DSISR_ISSTORE)
|
|
access |= _PAGE_WRITE;
|
|
/*
|
|
* We set _PAGE_PRIVILEGED only when
|
|
* kernel mode access kernel space.
|
|
*
|
|
* _PAGE_PRIVILEGED is NOT set
|
|
* 1) when kernel mode access user space
|
|
* 2) user space access kernel space.
|
|
*/
|
|
access |= _PAGE_PRIVILEGED;
|
|
if ((msr & MSR_PR) || (REGION_ID(ea) == USER_REGION_ID))
|
|
access &= ~_PAGE_PRIVILEGED;
|
|
|
|
if (trap == 0x400)
|
|
access |= _PAGE_EXEC;
|
|
|
|
return hash_page_mm(mm, ea, access, trap, flags);
|
|
}
|
|
|
|
void hash_preload(struct mm_struct *mm, unsigned long ea,
|
|
unsigned long access, unsigned long trap)
|
|
{
|
|
int hugepage_shift;
|
|
unsigned long vsid;
|
|
pgd_t *pgdir;
|
|
pte_t *ptep;
|
|
unsigned long flags;
|
|
int rc, ssize, update_flags = 0;
|
|
|
|
BUG_ON(REGION_ID(ea) != USER_REGION_ID);
|
|
|
|
#ifdef CONFIG_PPC_MM_SLICES
|
|
/* We only prefault standard pages for now */
|
|
if (unlikely(get_slice_psize(mm, ea) != mm->context.user_psize))
|
|
return;
|
|
#endif
|
|
|
|
DBG_LOW("hash_preload(mm=%p, mm->pgdir=%p, ea=%016lx, access=%lx,"
|
|
" trap=%lx\n", mm, mm->pgd, ea, access, trap);
|
|
|
|
/* Get Linux PTE if available */
|
|
pgdir = mm->pgd;
|
|
if (pgdir == NULL)
|
|
return;
|
|
|
|
/* Get VSID */
|
|
ssize = user_segment_size(ea);
|
|
vsid = get_vsid(mm->context.id, ea, ssize);
|
|
if (!vsid)
|
|
return;
|
|
/*
|
|
* Hash doesn't like irqs. Walking linux page table with irq disabled
|
|
* saves us from holding multiple locks.
|
|
*/
|
|
local_irq_save(flags);
|
|
|
|
/*
|
|
* THP pages use update_mmu_cache_pmd. We don't do
|
|
* hash preload there. Hence can ignore THP here
|
|
*/
|
|
ptep = find_linux_pte_or_hugepte(pgdir, ea, NULL, &hugepage_shift);
|
|
if (!ptep)
|
|
goto out_exit;
|
|
|
|
WARN_ON(hugepage_shift);
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
/* If either H_PAGE_4K_PFN or cache inhibited 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) & H_PAGE_4K_PFN) || pte_ci(*ptep))
|
|
goto out_exit;
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
|
|
/* Is that local to this CPU ? */
|
|
if (cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id())))
|
|
update_flags |= HPTE_LOCAL_UPDATE;
|
|
|
|
/* Hash it in */
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
if (mm->context.user_psize == MMU_PAGE_64K)
|
|
rc = __hash_page_64K(ea, access, vsid, ptep, trap,
|
|
update_flags, ssize);
|
|
else
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
rc = __hash_page_4K(ea, access, vsid, ptep, trap, update_flags,
|
|
ssize, subpage_protection(mm, ea));
|
|
|
|
/* Dump some info in case of hash insertion failure, they should
|
|
* never happen so it is really useful to know if/when they do
|
|
*/
|
|
if (rc == -1)
|
|
hash_failure_debug(ea, access, vsid, trap, ssize,
|
|
mm->context.user_psize,
|
|
mm->context.user_psize,
|
|
pte_val(*ptep));
|
|
out_exit:
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/* WARNING: This is called from hash_low_64.S, if you change this prototype,
|
|
* do not forget to update the assembly call site !
|
|
*/
|
|
void flush_hash_page(unsigned long vpn, real_pte_t pte, int psize, int ssize,
|
|
unsigned long flags)
|
|
{
|
|
unsigned long hash, index, shift, hidx, slot;
|
|
int local = flags & HPTE_LOCAL_UPDATE;
|
|
|
|
DBG_LOW("flush_hash_page(vpn=%016lx)\n", vpn);
|
|
pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
|
|
hash = hpt_hash(vpn, shift, ssize);
|
|
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 %ld: hash=%lx, hidx=%lx\n", index, slot, hidx);
|
|
/*
|
|
* We use same base page size and actual psize, because we don't
|
|
* use these functions for hugepage
|
|
*/
|
|
ppc_md.hpte_invalidate(slot, vpn, psize, psize, ssize, local);
|
|
} pte_iterate_hashed_end();
|
|
|
|
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
|
|
/* Transactions are not aborted by tlbiel, only tlbie.
|
|
* Without, syncing a page back to a block device w/ PIO could pick up
|
|
* transactional data (bad!) so we force an abort here. Before the
|
|
* sync the page will be made read-only, which will flush_hash_page.
|
|
* BIG ISSUE here: if the kernel uses a page from userspace without
|
|
* unmapping it first, it may see the speculated version.
|
|
*/
|
|
if (local && cpu_has_feature(CPU_FTR_TM) &&
|
|
current->thread.regs &&
|
|
MSR_TM_ACTIVE(current->thread.regs->msr)) {
|
|
tm_enable();
|
|
tm_abort(TM_CAUSE_TLBI);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
void flush_hash_hugepage(unsigned long vsid, unsigned long addr,
|
|
pmd_t *pmdp, unsigned int psize, int ssize,
|
|
unsigned long flags)
|
|
{
|
|
int i, max_hpte_count, valid;
|
|
unsigned long s_addr;
|
|
unsigned char *hpte_slot_array;
|
|
unsigned long hidx, shift, vpn, hash, slot;
|
|
int local = flags & HPTE_LOCAL_UPDATE;
|
|
|
|
s_addr = addr & HPAGE_PMD_MASK;
|
|
hpte_slot_array = get_hpte_slot_array(pmdp);
|
|
/*
|
|
* IF we try to do a HUGE PTE update after a withdraw is done.
|
|
* we will find the below NULL. This happens when we do
|
|
* split_huge_page_pmd
|
|
*/
|
|
if (!hpte_slot_array)
|
|
return;
|
|
|
|
if (ppc_md.hugepage_invalidate) {
|
|
ppc_md.hugepage_invalidate(vsid, s_addr, hpte_slot_array,
|
|
psize, ssize, local);
|
|
goto tm_abort;
|
|
}
|
|
/*
|
|
* No bluk hpte removal support, invalidate each entry
|
|
*/
|
|
shift = mmu_psize_defs[psize].shift;
|
|
max_hpte_count = HPAGE_PMD_SIZE >> shift;
|
|
for (i = 0; i < max_hpte_count; i++) {
|
|
/*
|
|
* 8 bits per each hpte entries
|
|
* 000| [ secondary group (one bit) | hidx (3 bits) | valid bit]
|
|
*/
|
|
valid = hpte_valid(hpte_slot_array, i);
|
|
if (!valid)
|
|
continue;
|
|
hidx = hpte_hash_index(hpte_slot_array, i);
|
|
|
|
/* get the vpn */
|
|
addr = s_addr + (i * (1ul << shift));
|
|
vpn = hpt_vpn(addr, vsid, ssize);
|
|
hash = hpt_hash(vpn, shift, ssize);
|
|
if (hidx & _PTEIDX_SECONDARY)
|
|
hash = ~hash;
|
|
|
|
slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
|
|
slot += hidx & _PTEIDX_GROUP_IX;
|
|
ppc_md.hpte_invalidate(slot, vpn, psize,
|
|
MMU_PAGE_16M, ssize, local);
|
|
}
|
|
tm_abort:
|
|
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
|
|
/* Transactions are not aborted by tlbiel, only tlbie.
|
|
* Without, syncing a page back to a block device w/ PIO could pick up
|
|
* transactional data (bad!) so we force an abort here. Before the
|
|
* sync the page will be made read-only, which will flush_hash_page.
|
|
* BIG ISSUE here: if the kernel uses a page from userspace without
|
|
* unmapping it first, it may see the speculated version.
|
|
*/
|
|
if (local && cpu_has_feature(CPU_FTR_TM) &&
|
|
current->thread.regs &&
|
|
MSR_TM_ACTIVE(current->thread.regs->msr)) {
|
|
tm_enable();
|
|
tm_abort(TM_CAUSE_TLBI);
|
|
}
|
|
#endif
|
|
return;
|
|
}
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
|
|
void flush_hash_range(unsigned long number, int local)
|
|
{
|
|
if (ppc_md.flush_hash_range)
|
|
ppc_md.flush_hash_range(number, local);
|
|
else {
|
|
int i;
|
|
struct ppc64_tlb_batch *batch =
|
|
this_cpu_ptr(&ppc64_tlb_batch);
|
|
|
|
for (i = 0; i < number; i++)
|
|
flush_hash_page(batch->vpn[i], batch->pte[i],
|
|
batch->psize, batch->ssize, local);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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, int rc)
|
|
{
|
|
enum ctx_state prev_state = exception_enter();
|
|
|
|
if (user_mode(regs)) {
|
|
#ifdef CONFIG_PPC_SUBPAGE_PROT
|
|
if (rc == -2)
|
|
_exception(SIGSEGV, regs, SEGV_ACCERR, address);
|
|
else
|
|
#endif
|
|
_exception(SIGBUS, regs, BUS_ADRERR, address);
|
|
} else
|
|
bad_page_fault(regs, address, SIGBUS);
|
|
|
|
exception_exit(prev_state);
|
|
}
|
|
|
|
long hpte_insert_repeating(unsigned long hash, unsigned long vpn,
|
|
unsigned long pa, unsigned long rflags,
|
|
unsigned long vflags, int psize, int ssize)
|
|
{
|
|
unsigned long hpte_group;
|
|
long slot;
|
|
|
|
repeat:
|
|
hpte_group = ((hash & htab_hash_mask) *
|
|
HPTES_PER_GROUP) & ~0x7UL;
|
|
|
|
/* Insert into the hash table, primary slot */
|
|
slot = ppc_md.hpte_insert(hpte_group, vpn, pa, rflags, vflags,
|
|
psize, psize, ssize);
|
|
|
|
/* Primary is full, try the secondary */
|
|
if (unlikely(slot == -1)) {
|
|
hpte_group = ((~hash & htab_hash_mask) *
|
|
HPTES_PER_GROUP) & ~0x7UL;
|
|
slot = ppc_md.hpte_insert(hpte_group, vpn, pa, rflags,
|
|
vflags | HPTE_V_SECONDARY,
|
|
psize, psize, ssize);
|
|
if (slot == -1) {
|
|
if (mftb() & 0x1)
|
|
hpte_group = ((hash & htab_hash_mask) *
|
|
HPTES_PER_GROUP)&~0x7UL;
|
|
|
|
ppc_md.hpte_remove(hpte_group);
|
|
goto repeat;
|
|
}
|
|
}
|
|
|
|
return slot;
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_PAGEALLOC
|
|
static void kernel_map_linear_page(unsigned long vaddr, unsigned long lmi)
|
|
{
|
|
unsigned long hash;
|
|
unsigned long vsid = get_kernel_vsid(vaddr, mmu_kernel_ssize);
|
|
unsigned long vpn = hpt_vpn(vaddr, vsid, mmu_kernel_ssize);
|
|
unsigned long mode = htab_convert_pte_flags(pgprot_val(PAGE_KERNEL));
|
|
long ret;
|
|
|
|
hash = hpt_hash(vpn, PAGE_SHIFT, mmu_kernel_ssize);
|
|
|
|
/* Don't create HPTE entries for bad address */
|
|
if (!vsid)
|
|
return;
|
|
|
|
ret = hpte_insert_repeating(hash, vpn, __pa(vaddr), mode,
|
|
HPTE_V_BOLTED,
|
|
mmu_linear_psize, mmu_kernel_ssize);
|
|
|
|
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)
|
|
{
|
|
unsigned long hash, hidx, slot;
|
|
unsigned long vsid = get_kernel_vsid(vaddr, mmu_kernel_ssize);
|
|
unsigned long vpn = hpt_vpn(vaddr, vsid, mmu_kernel_ssize);
|
|
|
|
hash = hpt_hash(vpn, PAGE_SHIFT, mmu_kernel_ssize);
|
|
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;
|
|
ppc_md.hpte_invalidate(slot, vpn, mmu_linear_psize, mmu_linear_psize,
|
|
mmu_kernel_ssize, 0);
|
|
}
|
|
|
|
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 */
|
|
|
|
void setup_initial_memory_limit(phys_addr_t first_memblock_base,
|
|
phys_addr_t first_memblock_size)
|
|
{
|
|
/* We don't currently support the first MEMBLOCK not mapping 0
|
|
* physical on those processors
|
|
*/
|
|
BUG_ON(first_memblock_base != 0);
|
|
|
|
/* On LPAR systems, the first entry is our RMA region,
|
|
* non-LPAR 64-bit hash MMU systems don't have a limitation
|
|
* on real mode access, but using the first entry works well
|
|
* enough. We also clamp it to 1G to avoid some funky things
|
|
* such as RTAS bugs etc...
|
|
*/
|
|
ppc64_rma_size = min_t(u64, first_memblock_size, 0x40000000);
|
|
|
|
/* Finally limit subsequent allocations */
|
|
memblock_set_current_limit(ppc64_rma_size);
|
|
}
|