507 lines
12 KiB
C
507 lines
12 KiB
C
/*
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* This file contains ioremap and related functions for 64-bit machines.
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*
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* Derived from arch/ppc64/mm/init.c
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@samba.org)
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*
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* Dave Engebretsen <engebret@us.ibm.com>
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* Rework for PPC64 port.
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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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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/export.h>
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#include <linux/types.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/stddef.h>
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#include <linux/vmalloc.h>
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#include <linux/memblock.h>
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#include <linux/slab.h>
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#include <linux/hugetlb.h>
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#include <asm/pgalloc.h>
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#include <asm/page.h>
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#include <asm/prom.h>
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#include <asm/io.h>
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#include <asm/mmu_context.h>
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#include <asm/pgtable.h>
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#include <asm/mmu.h>
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#include <asm/smp.h>
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#include <asm/machdep.h>
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#include <asm/tlb.h>
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#include <asm/trace.h>
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#include <asm/processor.h>
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#include <asm/cputable.h>
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#include <asm/sections.h>
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#include <asm/firmware.h>
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#include <asm/dma.h>
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#include <asm/powernv.h>
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#include "mmu_decl.h"
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#ifdef CONFIG_PPC_BOOK3S_64
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/*
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* partition table and process table for ISA 3.0
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*/
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struct prtb_entry *process_tb;
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struct patb_entry *partition_tb;
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/*
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* page table size
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*/
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unsigned long __pte_index_size;
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EXPORT_SYMBOL(__pte_index_size);
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unsigned long __pmd_index_size;
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EXPORT_SYMBOL(__pmd_index_size);
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unsigned long __pud_index_size;
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EXPORT_SYMBOL(__pud_index_size);
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unsigned long __pgd_index_size;
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EXPORT_SYMBOL(__pgd_index_size);
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unsigned long __pmd_cache_index;
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EXPORT_SYMBOL(__pmd_cache_index);
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unsigned long __pud_cache_index;
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EXPORT_SYMBOL(__pud_cache_index);
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unsigned long __pte_table_size;
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EXPORT_SYMBOL(__pte_table_size);
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unsigned long __pmd_table_size;
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EXPORT_SYMBOL(__pmd_table_size);
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unsigned long __pud_table_size;
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EXPORT_SYMBOL(__pud_table_size);
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unsigned long __pgd_table_size;
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EXPORT_SYMBOL(__pgd_table_size);
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unsigned long __pmd_val_bits;
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EXPORT_SYMBOL(__pmd_val_bits);
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unsigned long __pud_val_bits;
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EXPORT_SYMBOL(__pud_val_bits);
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unsigned long __pgd_val_bits;
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EXPORT_SYMBOL(__pgd_val_bits);
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unsigned long __kernel_virt_start;
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EXPORT_SYMBOL(__kernel_virt_start);
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unsigned long __kernel_virt_size;
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EXPORT_SYMBOL(__kernel_virt_size);
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unsigned long __vmalloc_start;
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EXPORT_SYMBOL(__vmalloc_start);
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unsigned long __vmalloc_end;
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EXPORT_SYMBOL(__vmalloc_end);
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unsigned long __kernel_io_start;
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EXPORT_SYMBOL(__kernel_io_start);
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struct page *vmemmap;
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EXPORT_SYMBOL(vmemmap);
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unsigned long __pte_frag_nr;
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EXPORT_SYMBOL(__pte_frag_nr);
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unsigned long __pte_frag_size_shift;
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EXPORT_SYMBOL(__pte_frag_size_shift);
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unsigned long ioremap_bot;
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#else /* !CONFIG_PPC_BOOK3S_64 */
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unsigned long ioremap_bot = IOREMAP_BASE;
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#endif
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/**
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* __ioremap_at - Low level function to establish the page tables
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* for an IO mapping
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*/
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void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size,
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unsigned long flags)
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{
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unsigned long i;
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/* Make sure we have the base flags */
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if ((flags & _PAGE_PRESENT) == 0)
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flags |= pgprot_val(PAGE_KERNEL);
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/* We don't support the 4K PFN hack with ioremap */
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if (flags & H_PAGE_4K_PFN)
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return NULL;
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WARN_ON(pa & ~PAGE_MASK);
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WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
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WARN_ON(size & ~PAGE_MASK);
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for (i = 0; i < size; i += PAGE_SIZE)
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if (map_kernel_page((unsigned long)ea+i, pa+i, flags))
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return NULL;
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return (void __iomem *)ea;
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}
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/**
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* __iounmap_from - Low level function to tear down the page tables
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* for an IO mapping. This is used for mappings that
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* are manipulated manually, like partial unmapping of
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* PCI IOs or ISA space.
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*/
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void __iounmap_at(void *ea, unsigned long size)
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{
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WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
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WARN_ON(size & ~PAGE_MASK);
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unmap_kernel_range((unsigned long)ea, size);
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}
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void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size,
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unsigned long flags, void *caller)
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{
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phys_addr_t paligned;
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void __iomem *ret;
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/*
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* Choose an address to map it to.
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* Once the imalloc system is running, we use it.
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* Before that, we map using addresses going
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* up from ioremap_bot. imalloc will use
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* the addresses from ioremap_bot through
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* IMALLOC_END
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*
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*/
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paligned = addr & PAGE_MASK;
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size = PAGE_ALIGN(addr + size) - paligned;
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if ((size == 0) || (paligned == 0))
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return NULL;
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if (slab_is_available()) {
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struct vm_struct *area;
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area = __get_vm_area_caller(size, VM_IOREMAP,
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ioremap_bot, IOREMAP_END,
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caller);
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if (area == NULL)
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return NULL;
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area->phys_addr = paligned;
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ret = __ioremap_at(paligned, area->addr, size, flags);
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if (!ret)
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vunmap(area->addr);
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} else {
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ret = __ioremap_at(paligned, (void *)ioremap_bot, size, flags);
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if (ret)
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ioremap_bot += size;
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}
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if (ret)
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ret += addr & ~PAGE_MASK;
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return ret;
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}
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void __iomem * __ioremap(phys_addr_t addr, unsigned long size,
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unsigned long flags)
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{
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return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
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}
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void __iomem * ioremap(phys_addr_t addr, unsigned long size)
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{
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unsigned long flags = pgprot_val(pgprot_noncached(__pgprot(0)));
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void *caller = __builtin_return_address(0);
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if (ppc_md.ioremap)
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return ppc_md.ioremap(addr, size, flags, caller);
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return __ioremap_caller(addr, size, flags, caller);
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}
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void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size)
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{
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unsigned long flags = pgprot_val(pgprot_noncached_wc(__pgprot(0)));
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void *caller = __builtin_return_address(0);
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if (ppc_md.ioremap)
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return ppc_md.ioremap(addr, size, flags, caller);
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return __ioremap_caller(addr, size, flags, caller);
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}
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void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size,
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unsigned long flags)
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{
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void *caller = __builtin_return_address(0);
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/* writeable implies dirty for kernel addresses */
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if (flags & _PAGE_WRITE)
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flags |= _PAGE_DIRTY;
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/* we don't want to let _PAGE_EXEC leak out */
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flags &= ~_PAGE_EXEC;
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/*
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* Force kernel mapping.
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*/
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flags &= ~_PAGE_USER;
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flags |= _PAGE_PRIVILEGED;
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if (ppc_md.ioremap)
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return ppc_md.ioremap(addr, size, flags, caller);
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return __ioremap_caller(addr, size, flags, caller);
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}
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/*
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* Unmap an IO region and remove it from imalloc'd list.
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* Access to IO memory should be serialized by driver.
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*/
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void __iounmap(volatile void __iomem *token)
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{
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void *addr;
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if (!slab_is_available())
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return;
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addr = (void *) ((unsigned long __force)
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PCI_FIX_ADDR(token) & PAGE_MASK);
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if ((unsigned long)addr < ioremap_bot) {
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printk(KERN_WARNING "Attempt to iounmap early bolted mapping"
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" at 0x%p\n", addr);
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return;
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}
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vunmap(addr);
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}
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void iounmap(volatile void __iomem *token)
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{
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if (ppc_md.iounmap)
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ppc_md.iounmap(token);
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else
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__iounmap(token);
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}
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EXPORT_SYMBOL(ioremap);
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EXPORT_SYMBOL(ioremap_wc);
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EXPORT_SYMBOL(ioremap_prot);
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EXPORT_SYMBOL(__ioremap);
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EXPORT_SYMBOL(__ioremap_at);
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EXPORT_SYMBOL(iounmap);
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EXPORT_SYMBOL(__iounmap);
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EXPORT_SYMBOL(__iounmap_at);
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#ifndef __PAGETABLE_PUD_FOLDED
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/* 4 level page table */
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struct page *pgd_page(pgd_t pgd)
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{
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if (pgd_huge(pgd))
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return pte_page(pgd_pte(pgd));
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return virt_to_page(pgd_page_vaddr(pgd));
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}
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#endif
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struct page *pud_page(pud_t pud)
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{
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if (pud_huge(pud))
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return pte_page(pud_pte(pud));
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return virt_to_page(pud_page_vaddr(pud));
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}
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/*
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* For hugepage we have pfn in the pmd, we use PTE_RPN_SHIFT bits for flags
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* For PTE page, we have a PTE_FRAG_SIZE (4K) aligned virtual address.
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*/
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struct page *pmd_page(pmd_t pmd)
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{
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if (pmd_trans_huge(pmd) || pmd_huge(pmd) || pmd_devmap(pmd))
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return pte_page(pmd_pte(pmd));
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return virt_to_page(pmd_page_vaddr(pmd));
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}
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#ifdef CONFIG_PPC_64K_PAGES
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static pte_t *get_from_cache(struct mm_struct *mm)
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{
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void *pte_frag, *ret;
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spin_lock(&mm->page_table_lock);
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ret = mm->context.pte_frag;
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if (ret) {
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pte_frag = ret + PTE_FRAG_SIZE;
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/*
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* If we have taken up all the fragments mark PTE page NULL
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*/
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if (((unsigned long)pte_frag & ~PAGE_MASK) == 0)
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pte_frag = NULL;
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mm->context.pte_frag = pte_frag;
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}
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spin_unlock(&mm->page_table_lock);
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return (pte_t *)ret;
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}
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static pte_t *__alloc_for_cache(struct mm_struct *mm, int kernel)
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{
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void *ret = NULL;
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struct page *page;
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if (!kernel) {
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page = alloc_page(PGALLOC_GFP | __GFP_ACCOUNT);
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if (!page)
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return NULL;
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if (!pgtable_page_ctor(page)) {
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__free_page(page);
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return NULL;
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}
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} else {
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page = alloc_page(PGALLOC_GFP);
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if (!page)
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return NULL;
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}
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ret = page_address(page);
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spin_lock(&mm->page_table_lock);
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/*
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* If we find pgtable_page set, we return
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* the allocated page with single fragement
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* count.
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*/
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if (likely(!mm->context.pte_frag)) {
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set_page_count(page, PTE_FRAG_NR);
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mm->context.pte_frag = ret + PTE_FRAG_SIZE;
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}
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spin_unlock(&mm->page_table_lock);
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return (pte_t *)ret;
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}
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pte_t *pte_fragment_alloc(struct mm_struct *mm, unsigned long vmaddr, int kernel)
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{
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pte_t *pte;
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pte = get_from_cache(mm);
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if (pte)
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return pte;
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return __alloc_for_cache(mm, kernel);
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}
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#endif /* CONFIG_PPC_64K_PAGES */
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void pte_fragment_free(unsigned long *table, int kernel)
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{
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struct page *page = virt_to_page(table);
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if (put_page_testzero(page)) {
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if (!kernel)
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pgtable_page_dtor(page);
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free_unref_page(page);
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}
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}
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#ifdef CONFIG_SMP
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void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift)
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{
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unsigned long pgf = (unsigned long)table;
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BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
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pgf |= shift;
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tlb_remove_table(tlb, (void *)pgf);
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}
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void __tlb_remove_table(void *_table)
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{
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void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
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unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
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if (!shift)
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/* PTE page needs special handling */
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pte_fragment_free(table, 0);
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else {
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BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
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kmem_cache_free(PGT_CACHE(shift), table);
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}
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}
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#else
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void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift)
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{
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if (!shift) {
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/* PTE page needs special handling */
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pte_fragment_free(table, 0);
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} else {
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BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
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kmem_cache_free(PGT_CACHE(shift), table);
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}
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}
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#endif
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#ifdef CONFIG_PPC_BOOK3S_64
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void __init mmu_partition_table_init(void)
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{
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unsigned long patb_size = 1UL << PATB_SIZE_SHIFT;
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unsigned long ptcr;
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BUILD_BUG_ON_MSG((PATB_SIZE_SHIFT > 36), "Partition table size too large.");
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partition_tb = __va(memblock_alloc_base(patb_size, patb_size,
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MEMBLOCK_ALLOC_ANYWHERE));
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/* Initialize the Partition Table with no entries */
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memset((void *)partition_tb, 0, patb_size);
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/*
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* update partition table control register,
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* 64 K size.
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*/
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ptcr = __pa(partition_tb) | (PATB_SIZE_SHIFT - 12);
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mtspr(SPRN_PTCR, ptcr);
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powernv_set_nmmu_ptcr(ptcr);
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}
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void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0,
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unsigned long dw1)
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{
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unsigned long old = be64_to_cpu(partition_tb[lpid].patb0);
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partition_tb[lpid].patb0 = cpu_to_be64(dw0);
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partition_tb[lpid].patb1 = cpu_to_be64(dw1);
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/*
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* Global flush of TLBs and partition table caches for this lpid.
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* The type of flush (hash or radix) depends on what the previous
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* use of this partition ID was, not the new use.
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*/
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asm volatile("ptesync" : : : "memory");
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if (old & PATB_HR) {
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asm volatile(PPC_TLBIE_5(%0,%1,2,0,1) : :
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"r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
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asm volatile(PPC_TLBIE_5(%0,%1,2,1,1) : :
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"r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
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trace_tlbie(lpid, 0, TLBIEL_INVAL_SET_LPID, lpid, 2, 0, 1);
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} else {
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asm volatile(PPC_TLBIE_5(%0,%1,2,0,0) : :
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"r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
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trace_tlbie(lpid, 0, TLBIEL_INVAL_SET_LPID, lpid, 2, 0, 0);
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}
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/* do we need fixup here ?*/
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asm volatile("eieio; tlbsync; ptesync" : : : "memory");
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}
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EXPORT_SYMBOL_GPL(mmu_partition_table_set_entry);
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#endif /* CONFIG_PPC_BOOK3S_64 */
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#ifdef CONFIG_STRICT_KERNEL_RWX
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void mark_rodata_ro(void)
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{
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if (!mmu_has_feature(MMU_FTR_KERNEL_RO)) {
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pr_warn("Warning: Unable to mark rodata read only on this CPU.\n");
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return;
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}
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if (radix_enabled())
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radix__mark_rodata_ro();
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else
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hash__mark_rodata_ro();
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}
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void mark_initmem_nx(void)
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{
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if (radix_enabled())
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radix__mark_initmem_nx();
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else
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hash__mark_initmem_nx();
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}
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#endif
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