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598ee698d9
page_table_range_init() presently allocates a PUD page for the 3-level page table case on X2 TLB configurations on each successive call. This results in the previous PUD page being trampled when PMDs with an overlapping PUD are initialized. This case was triggered by putting persistent kmaps immediately below the fixmap range for highmem. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
556 lines
13 KiB
C
556 lines
13 KiB
C
/*
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* linux/arch/sh/mm/init.c
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*
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* Copyright (C) 1999 Niibe Yutaka
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* Copyright (C) 2002 - 2010 Paul Mundt
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*
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* Based on linux/arch/i386/mm/init.c:
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* Copyright (C) 1995 Linus Torvalds
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*/
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/gfp.h>
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#include <linux/bootmem.h>
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#include <linux/proc_fs.h>
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#include <linux/pagemap.h>
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#include <linux/percpu.h>
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#include <linux/io.h>
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#include <linux/lmb.h>
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#include <linux/dma-mapping.h>
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#include <asm/mmu_context.h>
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#include <asm/mmzone.h>
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#include <asm/kexec.h>
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#include <asm/tlb.h>
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#include <asm/cacheflush.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/cache.h>
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#include <asm/sizes.h>
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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pgd_t swapper_pg_dir[PTRS_PER_PGD];
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void __init generic_mem_init(void)
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{
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lmb_add(__MEMORY_START, __MEMORY_SIZE);
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}
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void __init __weak plat_mem_setup(void)
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{
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/* Nothing to see here, move along. */
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}
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#ifdef CONFIG_MMU
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static pte_t *__get_pte_phys(unsigned long addr)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pgd = pgd_offset_k(addr);
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if (pgd_none(*pgd)) {
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pgd_ERROR(*pgd);
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return NULL;
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}
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pud = pud_alloc(NULL, pgd, addr);
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if (unlikely(!pud)) {
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pud_ERROR(*pud);
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return NULL;
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}
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pmd = pmd_alloc(NULL, pud, addr);
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if (unlikely(!pmd)) {
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pmd_ERROR(*pmd);
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return NULL;
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}
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return pte_offset_kernel(pmd, addr);
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}
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static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
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{
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pte_t *pte;
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pte = __get_pte_phys(addr);
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if (!pte_none(*pte)) {
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pte_ERROR(*pte);
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return;
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}
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set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
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local_flush_tlb_one(get_asid(), addr);
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if (pgprot_val(prot) & _PAGE_WIRED)
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tlb_wire_entry(NULL, addr, *pte);
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}
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static void clear_pte_phys(unsigned long addr, pgprot_t prot)
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{
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pte_t *pte;
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pte = __get_pte_phys(addr);
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if (pgprot_val(prot) & _PAGE_WIRED)
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tlb_unwire_entry();
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set_pte(pte, pfn_pte(0, __pgprot(0)));
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local_flush_tlb_one(get_asid(), addr);
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}
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void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
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{
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unsigned long address = __fix_to_virt(idx);
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if (idx >= __end_of_fixed_addresses) {
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BUG();
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return;
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}
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set_pte_phys(address, phys, prot);
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}
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void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
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{
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unsigned long address = __fix_to_virt(idx);
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if (idx >= __end_of_fixed_addresses) {
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BUG();
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return;
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}
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clear_pte_phys(address, prot);
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}
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static pmd_t * __init one_md_table_init(pud_t *pud)
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{
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if (pud_none(*pud)) {
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pmd_t *pmd;
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pmd = alloc_bootmem_pages(PAGE_SIZE);
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pud_populate(&init_mm, pud, pmd);
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BUG_ON(pmd != pmd_offset(pud, 0));
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}
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return pmd_offset(pud, 0);
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}
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static pte_t * __init one_page_table_init(pmd_t *pmd)
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{
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if (pmd_none(*pmd)) {
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pte_t *pte;
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pte = alloc_bootmem_pages(PAGE_SIZE);
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pmd_populate_kernel(&init_mm, pmd, pte);
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BUG_ON(pte != pte_offset_kernel(pmd, 0));
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}
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return pte_offset_kernel(pmd, 0);
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}
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static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
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unsigned long vaddr, pte_t *lastpte)
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{
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return pte;
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}
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void __init page_table_range_init(unsigned long start, unsigned long end,
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pgd_t *pgd_base)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte = NULL;
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int i, j, k;
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unsigned long vaddr;
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vaddr = start;
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i = __pgd_offset(vaddr);
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j = __pud_offset(vaddr);
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k = __pmd_offset(vaddr);
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pgd = pgd_base + i;
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for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
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pud = (pud_t *)pgd;
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for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
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pmd = one_md_table_init(pud);
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#ifndef __PAGETABLE_PMD_FOLDED
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pmd += k;
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#endif
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for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
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pte = page_table_kmap_check(one_page_table_init(pmd),
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pmd, vaddr, pte);
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vaddr += PMD_SIZE;
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}
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k = 0;
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}
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j = 0;
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}
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}
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#endif /* CONFIG_MMU */
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void __init allocate_pgdat(unsigned int nid)
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{
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unsigned long start_pfn, end_pfn;
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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unsigned long phys;
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#endif
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get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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phys = __lmb_alloc_base(sizeof(struct pglist_data),
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SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
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/* Retry with all of system memory */
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if (!phys)
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phys = __lmb_alloc_base(sizeof(struct pglist_data),
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SMP_CACHE_BYTES, lmb_end_of_DRAM());
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if (!phys)
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panic("Can't allocate pgdat for node %d\n", nid);
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NODE_DATA(nid) = __va(phys);
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memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
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NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
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#endif
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NODE_DATA(nid)->node_start_pfn = start_pfn;
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NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
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}
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static void __init bootmem_init_one_node(unsigned int nid)
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{
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unsigned long total_pages, paddr;
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unsigned long end_pfn;
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struct pglist_data *p;
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int i;
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p = NODE_DATA(nid);
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/* Nothing to do.. */
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if (!p->node_spanned_pages)
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return;
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end_pfn = p->node_start_pfn + p->node_spanned_pages;
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total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
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paddr = lmb_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
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if (!paddr)
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panic("Can't allocate bootmap for nid[%d]\n", nid);
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init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
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free_bootmem_with_active_regions(nid, end_pfn);
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/*
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* XXX Handle initial reservations for the system memory node
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* only for the moment, we'll refactor this later for handling
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* reservations in other nodes.
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*/
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if (nid == 0) {
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/* Reserve the sections we're already using. */
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for (i = 0; i < lmb.reserved.cnt; i++)
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reserve_bootmem(lmb.reserved.region[i].base,
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lmb_size_bytes(&lmb.reserved, i),
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BOOTMEM_DEFAULT);
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}
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sparse_memory_present_with_active_regions(nid);
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}
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static void __init do_init_bootmem(void)
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{
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int i;
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/* Add active regions with valid PFNs. */
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for (i = 0; i < lmb.memory.cnt; i++) {
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unsigned long start_pfn, end_pfn;
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start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
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end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
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__add_active_range(0, start_pfn, end_pfn);
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}
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/* All of system RAM sits in node 0 for the non-NUMA case */
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allocate_pgdat(0);
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node_set_online(0);
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plat_mem_setup();
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for_each_online_node(i)
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bootmem_init_one_node(i);
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sparse_init();
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}
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static void __init early_reserve_mem(void)
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{
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unsigned long start_pfn;
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/*
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* Partially used pages are not usable - thus
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* we are rounding upwards:
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*/
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start_pfn = PFN_UP(__pa(_end));
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/*
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* Reserve the kernel text and Reserve the bootmem bitmap. We do
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* this in two steps (first step was init_bootmem()), because
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* this catches the (definitely buggy) case of us accidentally
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* initializing the bootmem allocator with an invalid RAM area.
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*/
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lmb_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
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(PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
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(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
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/*
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* Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
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*/
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if (CONFIG_ZERO_PAGE_OFFSET != 0)
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lmb_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
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/*
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* Handle additional early reservations
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*/
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check_for_initrd();
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reserve_crashkernel();
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}
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void __init paging_init(void)
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{
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unsigned long max_zone_pfns[MAX_NR_ZONES];
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unsigned long vaddr, end;
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int nid;
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lmb_init();
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sh_mv.mv_mem_init();
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early_reserve_mem();
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lmb_enforce_memory_limit(memory_limit);
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lmb_analyze();
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lmb_dump_all();
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/*
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* Determine low and high memory ranges:
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*/
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max_low_pfn = max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT;
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min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
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nodes_clear(node_online_map);
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memory_start = (unsigned long)__va(__MEMORY_START);
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memory_end = memory_start + (memory_limit ?: lmb_phys_mem_size());
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uncached_init();
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pmb_init();
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do_init_bootmem();
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ioremap_fixed_init();
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/* We don't need to map the kernel through the TLB, as
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* it is permanatly mapped using P1. So clear the
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* entire pgd. */
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memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
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/* Set an initial value for the MMU.TTB so we don't have to
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* check for a null value. */
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set_TTB(swapper_pg_dir);
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/*
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* Populate the relevant portions of swapper_pg_dir so that
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* we can use the fixmap entries without calling kmalloc.
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* pte's will be filled in by __set_fixmap().
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*/
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vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
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end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
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page_table_range_init(vaddr, end, swapper_pg_dir);
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kmap_coherent_init();
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memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
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for_each_online_node(nid) {
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pg_data_t *pgdat = NODE_DATA(nid);
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unsigned long low, start_pfn;
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start_pfn = pgdat->bdata->node_min_pfn;
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low = pgdat->bdata->node_low_pfn;
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if (max_zone_pfns[ZONE_NORMAL] < low)
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max_zone_pfns[ZONE_NORMAL] = low;
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printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
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nid, start_pfn, low);
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}
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free_area_init_nodes(max_zone_pfns);
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}
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/*
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* Early initialization for any I/O MMUs we might have.
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*/
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static void __init iommu_init(void)
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{
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no_iommu_init();
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}
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unsigned int mem_init_done = 0;
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void __init mem_init(void)
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{
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int codesize, datasize, initsize;
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int nid;
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iommu_init();
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num_physpages = 0;
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high_memory = NULL;
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for_each_online_node(nid) {
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pg_data_t *pgdat = NODE_DATA(nid);
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unsigned long node_pages = 0;
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void *node_high_memory;
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num_physpages += pgdat->node_present_pages;
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if (pgdat->node_spanned_pages)
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node_pages = free_all_bootmem_node(pgdat);
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totalram_pages += node_pages;
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node_high_memory = (void *)__va((pgdat->node_start_pfn +
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pgdat->node_spanned_pages) <<
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PAGE_SHIFT);
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if (node_high_memory > high_memory)
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high_memory = node_high_memory;
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}
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/* Set this up early, so we can take care of the zero page */
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cpu_cache_init();
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/* clear the zero-page */
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memset(empty_zero_page, 0, PAGE_SIZE);
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__flush_wback_region(empty_zero_page, PAGE_SIZE);
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vsyscall_init();
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codesize = (unsigned long) &_etext - (unsigned long) &_text;
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datasize = (unsigned long) &_edata - (unsigned long) &_etext;
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initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
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printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
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"%dk data, %dk init)\n",
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nr_free_pages() << (PAGE_SHIFT-10),
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num_physpages << (PAGE_SHIFT-10),
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codesize >> 10,
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datasize >> 10,
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initsize >> 10);
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printk(KERN_INFO "virtual kernel memory layout:\n"
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" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
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#ifdef CONFIG_HIGHMEM
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" pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
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#endif
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" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
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" lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
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#ifdef CONFIG_UNCACHED_MAPPING
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" : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
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#endif
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" .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
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" .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
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" .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
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FIXADDR_START, FIXADDR_TOP,
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(FIXADDR_TOP - FIXADDR_START) >> 10,
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#ifdef CONFIG_HIGHMEM
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PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
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(LAST_PKMAP*PAGE_SIZE) >> 10,
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#endif
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(unsigned long)VMALLOC_START, VMALLOC_END,
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(VMALLOC_END - VMALLOC_START) >> 20,
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(unsigned long)memory_start, (unsigned long)high_memory,
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((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
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#ifdef CONFIG_UNCACHED_MAPPING
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uncached_start, uncached_end, uncached_size >> 20,
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#endif
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(unsigned long)&__init_begin, (unsigned long)&__init_end,
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((unsigned long)&__init_end -
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(unsigned long)&__init_begin) >> 10,
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(unsigned long)&_etext, (unsigned long)&_edata,
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((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
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(unsigned long)&_text, (unsigned long)&_etext,
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((unsigned long)&_etext - (unsigned long)&_text) >> 10);
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mem_init_done = 1;
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}
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void free_initmem(void)
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{
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unsigned long addr;
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addr = (unsigned long)(&__init_begin);
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for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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free_page(addr);
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totalram_pages++;
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}
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printk("Freeing unused kernel memory: %ldk freed\n",
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((unsigned long)&__init_end -
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|
(unsigned long)&__init_begin) >> 10);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
unsigned long p;
|
|
for (p = start; p < end; p += PAGE_SIZE) {
|
|
ClearPageReserved(virt_to_page(p));
|
|
init_page_count(virt_to_page(p));
|
|
free_page(p);
|
|
totalram_pages++;
|
|
}
|
|
printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
int arch_add_memory(int nid, u64 start, u64 size)
|
|
{
|
|
pg_data_t *pgdat;
|
|
unsigned long start_pfn = start >> PAGE_SHIFT;
|
|
unsigned long nr_pages = size >> PAGE_SHIFT;
|
|
int ret;
|
|
|
|
pgdat = NODE_DATA(nid);
|
|
|
|
/* We only have ZONE_NORMAL, so this is easy.. */
|
|
ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
|
|
start_pfn, nr_pages);
|
|
if (unlikely(ret))
|
|
printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(arch_add_memory);
|
|
|
|
#ifdef CONFIG_NUMA
|
|
int memory_add_physaddr_to_nid(u64 addr)
|
|
{
|
|
/* Node 0 for now.. */
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
|
|
#endif
|
|
|
|
#endif /* CONFIG_MEMORY_HOTPLUG */
|