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![Aneesh Kumar K.V](/assets/img/avatar_default.png)
Even when we have HugeTLB and THP disabled, kernel linear map can still be mapped with hugepages. This is only an issue with radix translation because hash MMU doesn't map kernel linear range in linux page table and other kernel map areas are not mapped using hugepage. Add config independent helpers and put WARN_ON() when we don't expect things to be mapped via hugepages. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
366 lines
8.9 KiB
C
366 lines
8.9 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/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/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 <mm/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 __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 __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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unsigned long __kernel_io_end;
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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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int __weak ioremap_range(unsigned long ea, phys_addr_t pa, unsigned long size, pgprot_t prot, int nid)
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{
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unsigned long i;
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for (i = 0; i < size; i += PAGE_SIZE) {
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int err = map_kernel_page(ea + i, pa + i, prot);
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if (err) {
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if (slab_is_available())
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unmap_kernel_range(ea, size);
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else
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WARN_ON_ONCE(1); /* Should clean up */
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return err;
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}
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}
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return 0;
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}
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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, pgprot_t prot)
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{
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/* We don't support the 4K PFN hack with ioremap */
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if (pgprot_val(prot) & H_PAGE_4K_PFN)
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return NULL;
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if ((ea + size) >= (void *)IOREMAP_END) {
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pr_warn("Outside the supported range\n");
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return NULL;
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}
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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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if (ioremap_range((unsigned long)ea, pa, size, prot, NUMA_NO_NODE))
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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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pgprot_t prot, 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, prot);
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} else {
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ret = __ioremap_at(paligned, (void *)ioremap_bot, size, prot);
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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, __pgprot(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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pgprot_t prot = pgprot_noncached(PAGE_KERNEL);
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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, prot, caller);
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return __ioremap_caller(addr, size, prot, 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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pgprot_t prot = pgprot_noncached_wc(PAGE_KERNEL);
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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, prot, caller);
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return __ioremap_caller(addr, size, prot, caller);
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}
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void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size)
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{
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pgprot_t prot = pgprot_cached(PAGE_KERNEL);
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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, prot, caller);
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return __ioremap_caller(addr, size, prot, 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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pte_t pte = __pte(flags);
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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 (pte_write(pte))
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pte = pte_mkdirty(pte);
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/* we don't want to let _PAGE_EXEC leak out */
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pte = pte_exprotect(pte);
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/*
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* Force kernel mapping.
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*/
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pte = pte_mkprivileged(pte);
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if (ppc_md.ioremap)
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return ppc_md.ioremap(addr, size, pte_pgprot(pte), caller);
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return __ioremap_caller(addr, size, pte_pgprot(pte), 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_is_leaf(pgd)) {
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VM_WARN_ON(!pgd_huge(pgd));
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return pte_page(pgd_pte(pgd));
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}
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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_is_leaf(pud)) {
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VM_WARN_ON(!pud_huge(pud));
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return pte_page(pud_pte(pud));
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}
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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_is_leaf(pmd)) {
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VM_WARN_ON(!(pmd_large(pmd) || pmd_huge(pmd) || pmd_devmap(pmd)));
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return pte_page(pmd_pte(pmd));
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}
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return virt_to_page(pmd_page_vaddr(pmd));
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}
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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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// mark_initmem_nx() should have already run by now
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ptdump_check_wx();
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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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