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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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32a74949b7
The base TLB support didn't include support for SPARSEMEM_VMEMMAP, though we did carve out some virtual space for it, the necessary support code wasn't there. This implements it by using 16M pages for now, though the page size could easily be changed at runtime if necessary. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
309 lines
7.7 KiB
C
309 lines
7.7 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/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/init.h>
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#include <linux/bootmem.h>
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#include <linux/lmb.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/system.h>
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#include <asm/abs_addr.h>
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#include <asm/firmware.h>
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#include "mmu_decl.h"
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unsigned long ioremap_bot = IOREMAP_BASE;
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#ifdef CONFIG_PPC_MMU_NOHASH
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static void *early_alloc_pgtable(unsigned long size)
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{
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void *pt;
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if (init_bootmem_done)
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pt = __alloc_bootmem(size, size, __pa(MAX_DMA_ADDRESS));
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else
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pt = __va(lmb_alloc_base(size, size,
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__pa(MAX_DMA_ADDRESS)));
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memset(pt, 0, size);
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return pt;
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}
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#endif /* CONFIG_PPC_MMU_NOHASH */
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/*
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* map_kernel_page currently only called by __ioremap
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* map_kernel_page adds an entry to the ioremap page table
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* and adds an entry to the HPT, possibly bolting it
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*/
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int map_kernel_page(unsigned long ea, unsigned long pa, int flags)
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{
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pgd_t *pgdp;
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pud_t *pudp;
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pmd_t *pmdp;
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pte_t *ptep;
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if (slab_is_available()) {
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pgdp = pgd_offset_k(ea);
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pudp = pud_alloc(&init_mm, pgdp, ea);
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if (!pudp)
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return -ENOMEM;
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pmdp = pmd_alloc(&init_mm, pudp, ea);
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if (!pmdp)
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return -ENOMEM;
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ptep = pte_alloc_kernel(pmdp, ea);
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if (!ptep)
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return -ENOMEM;
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set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
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__pgprot(flags)));
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} else {
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#ifdef CONFIG_PPC_MMU_NOHASH
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/* Warning ! This will blow up if bootmem is not initialized
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* which our ppc64 code is keen to do that, we'll need to
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* fix it and/or be more careful
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*/
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pgdp = pgd_offset_k(ea);
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#ifdef PUD_TABLE_SIZE
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if (pgd_none(*pgdp)) {
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pudp = early_alloc_pgtable(PUD_TABLE_SIZE);
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BUG_ON(pudp == NULL);
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pgd_populate(&init_mm, pgdp, pudp);
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}
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#endif /* PUD_TABLE_SIZE */
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pudp = pud_offset(pgdp, ea);
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if (pud_none(*pudp)) {
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pmdp = early_alloc_pgtable(PMD_TABLE_SIZE);
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BUG_ON(pmdp == NULL);
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pud_populate(&init_mm, pudp, pmdp);
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}
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pmdp = pmd_offset(pudp, ea);
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if (!pmd_present(*pmdp)) {
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ptep = early_alloc_pgtable(PAGE_SIZE);
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BUG_ON(ptep == NULL);
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pmd_populate_kernel(&init_mm, pmdp, ptep);
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}
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ptep = pte_offset_kernel(pmdp, ea);
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set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
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__pgprot(flags)));
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#else /* CONFIG_PPC_MMU_NOHASH */
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/*
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* If the mm subsystem is not fully up, we cannot create a
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* linux page table entry for this mapping. Simply bolt an
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* entry in the hardware page table.
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*
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*/
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if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags,
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mmu_io_psize, mmu_kernel_ssize)) {
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printk(KERN_ERR "Failed to do bolted mapping IO "
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"memory at %016lx !\n", pa);
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return -ENOMEM;
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}
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#endif /* !CONFIG_PPC_MMU_NOHASH */
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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,
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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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/* Non-cacheable page cannot be coherent */
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if (flags & _PAGE_NO_CACHE)
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flags &= ~_PAGE_COHERENT;
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/* We don't support the 4K PFN hack with ioremap */
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if (flags & _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 (mem_init_done) {
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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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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 = _PAGE_NO_CACHE | _PAGE_GUARDED;
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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_flags(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_RW)
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flags |= _PAGE_DIRTY;
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/* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
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flags &= ~(_PAGE_USER | _PAGE_EXEC);
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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 (!mem_init_done)
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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_flags);
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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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