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Diffstat (limited to 'arch/tile/mm/init.c')
| -rw-r--r-- | arch/tile/mm/init.c | 956 |
1 files changed, 0 insertions, 956 deletions
diff --git a/arch/tile/mm/init.c b/arch/tile/mm/init.c deleted file mode 100644 index 5f757e04bcd2..000000000000 --- a/arch/tile/mm/init.c +++ /dev/null @@ -1,956 +0,0 @@ -/* - * Copyright (C) 1995 Linus Torvalds - * Copyright 2010 Tilera Corporation. All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, version 2. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for - * more details. - */ - -#include <linux/module.h> -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/string.h> -#include <linux/types.h> -#include <linux/ptrace.h> -#include <linux/mman.h> -#include <linux/mm.h> -#include <linux/hugetlb.h> -#include <linux/swap.h> -#include <linux/smp.h> -#include <linux/init.h> -#include <linux/highmem.h> -#include <linux/pagemap.h> -#include <linux/poison.h> -#include <linux/bootmem.h> -#include <linux/slab.h> -#include <linux/proc_fs.h> -#include <linux/efi.h> -#include <linux/memory_hotplug.h> -#include <linux/uaccess.h> -#include <asm/mmu_context.h> -#include <asm/processor.h> -#include <asm/pgtable.h> -#include <asm/pgalloc.h> -#include <asm/dma.h> -#include <asm/fixmap.h> -#include <asm/tlb.h> -#include <asm/tlbflush.h> -#include <asm/sections.h> -#include <asm/setup.h> -#include <asm/homecache.h> -#include <hv/hypervisor.h> -#include <arch/chip.h> - -#include "migrate.h" - -#define clear_pgd(pmdptr) (*(pmdptr) = hv_pte(0)) - -#ifndef __tilegx__ -unsigned long VMALLOC_RESERVE = CONFIG_VMALLOC_RESERVE; -EXPORT_SYMBOL(VMALLOC_RESERVE); -#endif - -/* Create an L2 page table */ -static pte_t * __init alloc_pte(void) -{ - return __alloc_bootmem(L2_KERNEL_PGTABLE_SIZE, HV_PAGE_TABLE_ALIGN, 0); -} - -/* - * L2 page tables per controller. We allocate these all at once from - * the bootmem allocator and store them here. This saves on kernel L2 - * page table memory, compared to allocating a full 64K page per L2 - * page table, and also means that in cases where we use huge pages, - * we are guaranteed to later be able to shatter those huge pages and - * switch to using these page tables instead, without requiring - * further allocation. Each l2_ptes[] entry points to the first page - * table for the first hugepage-size piece of memory on the - * controller; other page tables are just indexed directly, i.e. the - * L2 page tables are contiguous in memory for each controller. - */ -static pte_t *l2_ptes[MAX_NUMNODES]; -static int num_l2_ptes[MAX_NUMNODES]; - -static void init_prealloc_ptes(int node, int pages) -{ - BUG_ON(pages & (PTRS_PER_PTE - 1)); - if (pages) { - num_l2_ptes[node] = pages; - l2_ptes[node] = __alloc_bootmem(pages * sizeof(pte_t), - HV_PAGE_TABLE_ALIGN, 0); - } -} - -pte_t *get_prealloc_pte(unsigned long pfn) -{ - int node = pfn_to_nid(pfn); - pfn &= ~(-1UL << (NR_PA_HIGHBIT_SHIFT - PAGE_SHIFT)); - BUG_ON(node >= MAX_NUMNODES); - BUG_ON(pfn >= num_l2_ptes[node]); - return &l2_ptes[node][pfn]; -} - -/* - * What caching do we expect pages from the heap to have when - * they are allocated during bootup? (Once we've installed the - * "real" swapper_pg_dir.) - */ -static int initial_heap_home(void) -{ - if (hash_default) - return PAGE_HOME_HASH; - return smp_processor_id(); -} - -/* - * Place a pointer to an L2 page table in a middle page - * directory entry. - */ -static void __init assign_pte(pmd_t *pmd, pte_t *page_table) -{ - phys_addr_t pa = __pa(page_table); - unsigned long l2_ptfn = pa >> HV_LOG2_PAGE_TABLE_ALIGN; - pte_t pteval = hv_pte_set_ptfn(__pgprot(_PAGE_TABLE), l2_ptfn); - BUG_ON((pa & (HV_PAGE_TABLE_ALIGN-1)) != 0); - pteval = pte_set_home(pteval, initial_heap_home()); - *(pte_t *)pmd = pteval; - if (page_table != (pte_t *)pmd_page_vaddr(*pmd)) - BUG(); -} - -#ifdef __tilegx__ - -static inline pmd_t *alloc_pmd(void) -{ - return __alloc_bootmem(L1_KERNEL_PGTABLE_SIZE, HV_PAGE_TABLE_ALIGN, 0); -} - -static inline void assign_pmd(pud_t *pud, pmd_t *pmd) -{ - assign_pte((pmd_t *)pud, (pte_t *)pmd); -} - -#endif /* __tilegx__ */ - -/* Replace the given pmd with a full PTE table. */ -void __init shatter_pmd(pmd_t *pmd) -{ - pte_t *pte = get_prealloc_pte(pte_pfn(*(pte_t *)pmd)); - assign_pte(pmd, pte); -} - -#ifdef __tilegx__ -static pmd_t *__init get_pmd(pgd_t pgtables[], unsigned long va) -{ - pud_t *pud = pud_offset(&pgtables[pgd_index(va)], va); - if (pud_none(*pud)) - assign_pmd(pud, alloc_pmd()); - return pmd_offset(pud, va); -} -#else -static pmd_t *__init get_pmd(pgd_t pgtables[], unsigned long va) -{ - return pmd_offset(pud_offset(&pgtables[pgd_index(va)], va), va); -} -#endif - -/* - * This function initializes a certain range of kernel virtual memory - * with new bootmem page tables, everywhere page tables are missing in - * the given range. - */ - -/* - * NOTE: The pagetables are allocated contiguous on the physical space - * so we can cache the place of the first one and move around without - * checking the pgd every time. - */ -static void __init page_table_range_init(unsigned long start, - unsigned long end, pgd_t *pgd) -{ - unsigned long vaddr; - start = round_down(start, PMD_SIZE); - end = round_up(end, PMD_SIZE); - for (vaddr = start; vaddr < end; vaddr += PMD_SIZE) { - pmd_t *pmd = get_pmd(pgd, vaddr); - if (pmd_none(*pmd)) - assign_pte(pmd, alloc_pte()); - } -} - - -static int __initdata ktext_hash = 1; /* .text pages */ -static int __initdata kdata_hash = 1; /* .data and .bss pages */ -int __ro_after_init hash_default = 1; /* kernel allocator pages */ -EXPORT_SYMBOL(hash_default); -int __ro_after_init kstack_hash = 1; /* if no homecaching, use h4h */ - -/* - * CPUs to use to for striping the pages of kernel data. If hash-for-home - * is available, this is only relevant if kcache_hash sets up the - * .data and .bss to be page-homed, and we don't want the default mode - * of using the full set of kernel cpus for the striping. - */ -static __initdata struct cpumask kdata_mask; -static __initdata int kdata_arg_seen; - -int __ro_after_init kdata_huge; /* if no homecaching, small pages */ - - -/* Combine a generic pgprot_t with cache home to get a cache-aware pgprot. */ -static pgprot_t __init construct_pgprot(pgprot_t prot, int home) -{ - prot = pte_set_home(prot, home); - if (home == PAGE_HOME_IMMUTABLE) { - if (ktext_hash) - prot = hv_pte_set_mode(prot, HV_PTE_MODE_CACHE_HASH_L3); - else - prot = hv_pte_set_mode(prot, HV_PTE_MODE_CACHE_NO_L3); - } - return prot; -} - -/* - * For a given kernel data VA, how should it be cached? - * We return the complete pgprot_t with caching bits set. - */ -static pgprot_t __init init_pgprot(ulong address) -{ - int cpu; - unsigned long page; - enum { CODE_DELTA = MEM_SV_START - PAGE_OFFSET }; - - /* For kdata=huge, everything is just hash-for-home. */ - if (kdata_huge) - return construct_pgprot(PAGE_KERNEL, PAGE_HOME_HASH); - - /* - * We map the aliased pages of permanent text so we can - * update them if necessary, for ftrace, etc. - */ - if (address < (ulong) _sinittext - CODE_DELTA) - return construct_pgprot(PAGE_KERNEL, PAGE_HOME_HASH); - - /* We map read-only data non-coherent for performance. */ - if ((address >= (ulong) __start_rodata && - address < (ulong) __end_rodata) || - address == (ulong) empty_zero_page) { - return construct_pgprot(PAGE_KERNEL_RO, PAGE_HOME_IMMUTABLE); - } - -#ifndef __tilegx__ - /* Force the atomic_locks[] array page to be hash-for-home. */ - if (address == (ulong) atomic_locks) - return construct_pgprot(PAGE_KERNEL, PAGE_HOME_HASH); -#endif - - /* - * Everything else that isn't data or bss is heap, so mark it - * with the initial heap home (hash-for-home, or this cpu). This - * includes any addresses after the loaded image and any address before - * __init_end, since we already captured the case of text before - * _sinittext, and __pa(einittext) is approximately __pa(__init_begin). - * - * All the LOWMEM pages that we mark this way will get their - * struct page homecache properly marked later, in set_page_homes(). - * The HIGHMEM pages we leave with a default zero for their - * homes, but with a zero free_time we don't have to actually - * do a flush action the first time we use them, either. - */ - if (address >= (ulong) _end || address < (ulong) __init_end) - return construct_pgprot(PAGE_KERNEL, initial_heap_home()); - - /* Use hash-for-home if requested for data/bss. */ - if (kdata_hash) - return construct_pgprot(PAGE_KERNEL, PAGE_HOME_HASH); - - /* - * Otherwise we just hand out consecutive cpus. To avoid - * requiring this function to hold state, we just walk forward from - * __end_rodata by PAGE_SIZE, skipping the readonly and init data, to - * reach the requested address, while walking cpu home around - * kdata_mask. This is typically no more than a dozen or so iterations. - */ - page = (((ulong)__end_rodata) + PAGE_SIZE - 1) & PAGE_MASK; - BUG_ON(address < page || address >= (ulong)_end); - cpu = cpumask_first(&kdata_mask); - for (; page < address; page += PAGE_SIZE) { - if (page >= (ulong)&init_thread_union && - page < (ulong)&init_thread_union + THREAD_SIZE) - continue; - if (page == (ulong)empty_zero_page) - continue; -#ifndef __tilegx__ - if (page == (ulong)atomic_locks) - continue; -#endif - cpu = cpumask_next(cpu, &kdata_mask); - if (cpu == NR_CPUS) - cpu = cpumask_first(&kdata_mask); - } - return construct_pgprot(PAGE_KERNEL, cpu); -} - -/* - * This function sets up how we cache the kernel text. If we have - * hash-for-home support, normally that is used instead (see the - * kcache_hash boot flag for more information). But if we end up - * using a page-based caching technique, this option sets up the - * details of that. In addition, the "ktext=nocache" option may - * always be used to disable local caching of text pages, if desired. - */ - -static int __initdata ktext_arg_seen; -static int __initdata ktext_small; -static int __initdata ktext_local; -static int __initdata ktext_all; -static int __initdata ktext_nondataplane; -static int __initdata ktext_nocache; -static struct cpumask __initdata ktext_mask; - -static int __init setup_ktext(char *str) -{ - if (str == NULL) - return -EINVAL; - - /* If you have a leading "nocache", turn off ktext caching */ - if (strncmp(str, "nocache", 7) == 0) { - ktext_nocache = 1; - pr_info("ktext: disabling local caching of kernel text\n"); - str += 7; - if (*str == ',') - ++str; - if (*str == '\0') - return 0; - } - - ktext_arg_seen = 1; - - /* Default setting: use a huge page */ - if (strcmp(str, "huge") == 0) - pr_info("ktext: using one huge locally cached page\n"); - - /* Pay TLB cost but get no cache benefit: cache small pages locally */ - else if (strcmp(str, "local") == 0) { - ktext_small = 1; - ktext_local = 1; - pr_info("ktext: using small pages with local caching\n"); - } - - /* Neighborhood cache ktext pages on all cpus. */ - else if (strcmp(str, "all") == 0) { - ktext_small = 1; - ktext_all = 1; - pr_info("ktext: using maximal caching neighborhood\n"); - } - - - /* Neighborhood ktext pages on specified mask */ - else if (cpulist_parse(str, &ktext_mask) == 0) { - if (cpumask_weight(&ktext_mask) > 1) { - ktext_small = 1; - pr_info("ktext: using caching neighborhood %*pbl with small pages\n", - cpumask_pr_args(&ktext_mask)); - } else { - pr_info("ktext: caching on cpu %*pbl with one huge page\n", - cpumask_pr_args(&ktext_mask)); - } - } - - else if (*str) - return -EINVAL; - - return 0; -} - -early_param("ktext", setup_ktext); - - -static inline pgprot_t ktext_set_nocache(pgprot_t prot) -{ - if (!ktext_nocache) - prot = hv_pte_set_nc(prot); - else - prot = hv_pte_set_no_alloc_l2(prot); - return prot; -} - -/* Temporary page table we use for staging. */ -static pgd_t pgtables[PTRS_PER_PGD] - __attribute__((aligned(HV_PAGE_TABLE_ALIGN))); - -/* - * This maps the physical memory to kernel virtual address space, a total - * of max_low_pfn pages, by creating page tables starting from address - * PAGE_OFFSET. - * - * This routine transitions us from using a set of compiled-in large - * pages to using some more precise caching, including removing access - * to code pages mapped at PAGE_OFFSET (executed only at MEM_SV_START) - * marking read-only data as locally cacheable, striping the remaining - * .data and .bss across all the available tiles, and removing access - * to pages above the top of RAM (thus ensuring a page fault from a bad - * virtual address rather than a hypervisor shoot down for accessing - * memory outside the assigned limits). - */ -static void __init kernel_physical_mapping_init(pgd_t *pgd_base) -{ - unsigned long long irqmask; - unsigned long address, pfn; - pmd_t *pmd; - pte_t *pte; - int pte_ofs; - const struct cpumask *my_cpu_mask = cpumask_of(smp_processor_id()); - struct cpumask kstripe_mask; - int rc, i; - - if (ktext_arg_seen && ktext_hash) { - pr_warn("warning: \"ktext\" boot argument ignored if \"kcache_hash\" sets up text hash-for-home\n"); - ktext_small = 0; - } - - if (kdata_arg_seen && kdata_hash) { - pr_warn("warning: \"kdata\" boot argument ignored if \"kcache_hash\" sets up data hash-for-home\n"); - } - - if (kdata_huge && !hash_default) { - pr_warn("warning: disabling \"kdata=huge\"; requires kcache_hash=all or =allbutstack\n"); - kdata_huge = 0; - } - - /* - * Set up a mask for cpus to use for kernel striping. - * This is normally all cpus, but minus dataplane cpus if any. - * If the dataplane covers the whole chip, we stripe over - * the whole chip too. - */ - cpumask_copy(&kstripe_mask, cpu_possible_mask); - if (!kdata_arg_seen) - kdata_mask = kstripe_mask; - - /* Allocate and fill in L2 page tables */ - for (i = 0; i < MAX_NUMNODES; ++i) { -#ifdef CONFIG_HIGHMEM - unsigned long end_pfn = node_lowmem_end_pfn[i]; -#else - unsigned long end_pfn = node_end_pfn[i]; -#endif - unsigned long end_huge_pfn = 0; - - /* Pre-shatter the last huge page to allow per-cpu pages. */ - if (kdata_huge) - end_huge_pfn = end_pfn - (HPAGE_SIZE >> PAGE_SHIFT); - - pfn = node_start_pfn[i]; - - /* Allocate enough memory to hold L2 page tables for node. */ - init_prealloc_ptes(i, end_pfn - pfn); - - address = (unsigned long) pfn_to_kaddr(pfn); - while (pfn < end_pfn) { - BUG_ON(address & (HPAGE_SIZE-1)); - pmd = get_pmd(pgtables, address); - pte = get_prealloc_pte(pfn); - if (pfn < end_huge_pfn) { - pgprot_t prot = init_pgprot(address); - *(pte_t *)pmd = pte_mkhuge(pfn_pte(pfn, prot)); - for (pte_ofs = 0; pte_ofs < PTRS_PER_PTE; - pfn++, pte_ofs++, address += PAGE_SIZE) - pte[pte_ofs] = pfn_pte(pfn, prot); - } else { - if (kdata_huge) - printk(KERN_DEBUG "pre-shattered huge page at %#lx\n", - address); - for (pte_ofs = 0; pte_ofs < PTRS_PER_PTE; - pfn++, pte_ofs++, address += PAGE_SIZE) { - pgprot_t prot = init_pgprot(address); - pte[pte_ofs] = pfn_pte(pfn, prot); - } - assign_pte(pmd, pte); - } - } - } - - /* - * Set or check ktext_map now that we have cpu_possible_mask - * and kstripe_mask to work with. - */ - if (ktext_all) - cpumask_copy(&ktext_mask, cpu_possible_mask); - else if (ktext_nondataplane) - ktext_mask = kstripe_mask; - else if (!cpumask_empty(&ktext_mask)) { - /* Sanity-check any mask that was requested */ - struct cpumask bad; - cpumask_andnot(&bad, &ktext_mask, cpu_possible_mask); - cpumask_and(&ktext_mask, &ktext_mask, cpu_possible_mask); - if (!cpumask_empty(&bad)) - pr_info("ktext: not using unavailable cpus %*pbl\n", - cpumask_pr_args(&bad)); - if (cpumask_empty(&ktext_mask)) { - pr_warn("ktext: no valid cpus; caching on %d\n", - smp_processor_id()); - cpumask_copy(&ktext_mask, - cpumask_of(smp_processor_id())); - } - } - - address = MEM_SV_START; - pmd = get_pmd(pgtables, address); - pfn = 0; /* code starts at PA 0 */ - if (ktext_small) { - /* Allocate an L2 PTE for the kernel text */ - int cpu = 0; - pgprot_t prot = construct_pgprot(PAGE_KERNEL_EXEC, - PAGE_HOME_IMMUTABLE); - - if (ktext_local) { - if (ktext_nocache) - prot = hv_pte_set_mode(prot, - HV_PTE_MODE_UNCACHED); - else - prot = hv_pte_set_mode(prot, - HV_PTE_MODE_CACHE_NO_L3); - } else { - prot = hv_pte_set_mode(prot, - HV_PTE_MODE_CACHE_TILE_L3); - cpu = cpumask_first(&ktext_mask); - - prot = ktext_set_nocache(prot); - } - - BUG_ON(address != (unsigned long)_text); - pte = NULL; - for (; address < (unsigned long)_einittext; - pfn++, address += PAGE_SIZE) { - pte_ofs = pte_index(address); - if (pte_ofs == 0) { - if (pte) - assign_pte(pmd++, pte); - pte = alloc_pte(); - } - if (!ktext_local) { - prot = set_remote_cache_cpu(prot, cpu); - cpu = cpumask_next(cpu, &ktext_mask); - if (cpu == NR_CPUS) - cpu = cpumask_first(&ktext_mask); - } - pte[pte_ofs] = pfn_pte(pfn, prot); - } - if (pte) - assign_pte(pmd, pte); - } else { - pte_t pteval = pfn_pte(0, PAGE_KERNEL_EXEC); - pteval = pte_mkhuge(pteval); - if (ktext_hash) { - pteval = hv_pte_set_mode(pteval, - HV_PTE_MODE_CACHE_HASH_L3); - pteval = ktext_set_nocache(pteval); - } else - if (cpumask_weight(&ktext_mask) == 1) { - pteval = set_remote_cache_cpu(pteval, - cpumask_first(&ktext_mask)); - pteval = hv_pte_set_mode(pteval, - HV_PTE_MODE_CACHE_TILE_L3); - pteval = ktext_set_nocache(pteval); - } else if (ktext_nocache) - pteval = hv_pte_set_mode(pteval, - HV_PTE_MODE_UNCACHED); - else - pteval = hv_pte_set_mode(pteval, - HV_PTE_MODE_CACHE_NO_L3); - for (; address < (unsigned long)_einittext; - pfn += PFN_DOWN(HPAGE_SIZE), address += HPAGE_SIZE) - *(pte_t *)(pmd++) = pfn_pte(pfn, pteval); - } - - /* Set swapper_pgprot here so it is flushed to memory right away. */ - swapper_pgprot = init_pgprot((unsigned long)swapper_pg_dir); - - /* - * Since we may be changing the caching of the stack and page - * table itself, we invoke an assembly helper to do the - * following steps: - * - * - flush the cache so we start with an empty slate - * - install pgtables[] as the real page table - * - flush the TLB so the new page table takes effect - */ - irqmask = interrupt_mask_save_mask(); - interrupt_mask_set_mask(-1ULL); - rc = flush_and_install_context(__pa(pgtables), - init_pgprot((unsigned long)pgtables), - __this_cpu_read(current_asid), - cpumask_bits(my_cpu_mask)); - interrupt_mask_restore_mask(irqmask); - BUG_ON(rc != 0); - - /* Copy the page table back to the normal swapper_pg_dir. */ - memcpy(pgd_base, pgtables, sizeof(pgtables)); - __install_page_table(pgd_base, __this_cpu_read(current_asid), - swapper_pgprot); - - /* - * We just read swapper_pgprot and thus brought it into the cache, - * with its new home & caching mode. When we start the other CPUs, - * they're going to reference swapper_pgprot via their initial fake - * VA-is-PA mappings, which cache everything locally. At that - * time, if it's in our cache with a conflicting home, the - * simulator's coherence checker will complain. So, flush it out - * of our cache; we're not going to ever use it again anyway. - */ - __insn_finv(&swapper_pgprot); -} - -/* - * devmem_is_allowed() checks to see if /dev/mem access to a certain address - * is valid. The argument is a physical page number. - * - * On Tile, the only valid things for which we can just hand out unchecked - * PTEs are the kernel code and data. Anything else might change its - * homing with time, and we wouldn't know to adjust the /dev/mem PTEs. - * Note that init_thread_union is released to heap soon after boot, - * so we include it in the init data. - * - * For TILE-Gx, we might want to consider allowing access to PA - * regions corresponding to PCI space, etc. - */ -int devmem_is_allowed(unsigned long pagenr) -{ - return pagenr < kaddr_to_pfn(_end) && - !(pagenr >= kaddr_to_pfn(&init_thread_union) || - pagenr < kaddr_to_pfn(__init_end)) && - !(pagenr >= kaddr_to_pfn(_sinittext) || - pagenr <= kaddr_to_pfn(_einittext-1)); -} - -#ifdef CONFIG_HIGHMEM -static void __init permanent_kmaps_init(pgd_t *pgd_base) -{ - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - unsigned long vaddr; - - vaddr = PKMAP_BASE; - page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); - - pgd = swapper_pg_dir + pgd_index(vaddr); - pud = pud_offset(pgd, vaddr); - pmd = pmd_offset(pud, vaddr); - pte = pte_offset_kernel(pmd, vaddr); - pkmap_page_table = pte; -} -#endif /* CONFIG_HIGHMEM */ - - -#ifndef CONFIG_64BIT -static void __init init_free_pfn_range(unsigned long start, unsigned long end) -{ - unsigned long pfn; - struct page *page = pfn_to_page(start); - - for (pfn = start; pfn < end; ) { - /* Optimize by freeing pages in large batches */ - int order = __ffs(pfn); - int count, i; - struct page *p; - - if (order >= MAX_ORDER) - order = MAX_ORDER-1; - count = 1 << order; - while (pfn + count > end) { - count >>= 1; - --order; - } - for (p = page, i = 0; i < count; ++i, ++p) { - __ClearPageReserved(p); - /* - * Hacky direct set to avoid unnecessary - * lock take/release for EVERY page here. - */ - p->_refcount.counter = 0; - p->_mapcount.counter = -1; - } - init_page_count(page); - __free_pages(page, order); - adjust_managed_page_count(page, count); - - page += count; - pfn += count; - } -} - -static void __init set_non_bootmem_pages_init(void) -{ - struct zone *z; - for_each_zone(z) { - unsigned long start, end; - int nid = z->zone_pgdat->node_id; -#ifdef CONFIG_HIGHMEM - int idx = zone_idx(z); -#endif - - start = z->zone_start_pfn; - end = start + z->spanned_pages; - start = max(start, node_free_pfn[nid]); - start = max(start, max_low_pfn); - -#ifdef CONFIG_HIGHMEM - if (idx == ZONE_HIGHMEM) - totalhigh_pages += z->spanned_pages; -#endif - if (kdata_huge) { - unsigned long percpu_pfn = node_percpu_pfn[nid]; - if (start < percpu_pfn && end > percpu_pfn) - end = percpu_pfn; - } -#ifdef CONFIG_PCI - if (start <= pci_reserve_start_pfn && - end > pci_reserve_start_pfn) { - if (end > pci_reserve_end_pfn) - init_free_pfn_range(pci_reserve_end_pfn, end); - end = pci_reserve_start_pfn; - } -#endif - init_free_pfn_range(start, end); - } -} -#endif - -/* - * paging_init() sets up the page tables - note that all of lowmem is - * already mapped by head.S. - */ -void __init paging_init(void) -{ -#ifdef __tilegx__ - pud_t *pud; -#endif - pgd_t *pgd_base = swapper_pg_dir; - - kernel_physical_mapping_init(pgd_base); - - /* Fixed mappings, only the page table structure has to be created. */ - page_table_range_init(fix_to_virt(__end_of_fixed_addresses - 1), - FIXADDR_TOP, pgd_base); - -#ifdef CONFIG_HIGHMEM - permanent_kmaps_init(pgd_base); -#endif - -#ifdef __tilegx__ - /* - * Since GX allocates just one pmd_t array worth of vmalloc space, - * we go ahead and allocate it statically here, then share it - * globally. As a result we don't have to worry about any task - * changing init_mm once we get up and running, and there's no - * need for e.g. vmalloc_sync_all(). - */ - BUILD_BUG_ON(pgd_index(VMALLOC_START) != pgd_index(VMALLOC_END - 1)); - pud = pud_offset(pgd_base + pgd_index(VMALLOC_START), VMALLOC_START); - assign_pmd(pud, alloc_pmd()); -#endif -} - - -/* - * Walk the kernel page tables and derive the page_home() from - * the PTEs, so that set_pte() can properly validate the caching - * of all PTEs it sees. - */ -void __init set_page_homes(void) -{ -} - -static void __init set_max_mapnr_init(void) -{ -#ifdef CONFIG_FLATMEM - max_mapnr = max_low_pfn; -#endif -} - -void __init mem_init(void) -{ - int i; -#ifndef __tilegx__ - void *last; -#endif - -#ifdef CONFIG_FLATMEM - BUG_ON(!mem_map); -#endif - -#ifdef CONFIG_HIGHMEM - /* check that fixmap and pkmap do not overlap */ - if (PKMAP_ADDR(LAST_PKMAP-1) >= FIXADDR_START) { - pr_err("fixmap and kmap areas overlap - this will crash\n"); - pr_err("pkstart: %lxh pkend: %lxh fixstart %lxh\n", - PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP-1), FIXADDR_START); - BUG(); - } -#endif - - set_max_mapnr_init(); - - /* this will put all bootmem onto the freelists */ - free_all_bootmem(); - -#ifndef CONFIG_64BIT - /* count all remaining LOWMEM and give all HIGHMEM to page allocator */ - set_non_bootmem_pages_init(); -#endif - - mem_init_print_info(NULL); - - /* - * In debug mode, dump some interesting memory mappings. - */ -#ifdef CONFIG_HIGHMEM - printk(KERN_DEBUG " KMAP %#lx - %#lx\n", - FIXADDR_START, FIXADDR_TOP + PAGE_SIZE - 1); - printk(KERN_DEBUG " PKMAP %#lx - %#lx\n", - PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP) - 1); -#endif - printk(KERN_DEBUG " VMALLOC %#lx - %#lx\n", - _VMALLOC_START, _VMALLOC_END - 1); -#ifdef __tilegx__ - for (i = MAX_NUMNODES-1; i >= 0; --i) { - struct pglist_data *node = &node_data[i]; - if (node->node_present_pages) { - unsigned long start = (unsigned long) - pfn_to_kaddr(node->node_start_pfn); - unsigned long end = start + - (node->node_present_pages << PAGE_SHIFT); - printk(KERN_DEBUG " MEM%d %#lx - %#lx\n", - i, start, end - 1); - } - } -#else - last = high_memory; - for (i = MAX_NUMNODES-1; i >= 0; --i) { - if ((unsigned long)vbase_map[i] != -1UL) { - printk(KERN_DEBUG " LOWMEM%d %#lx - %#lx\n", - i, (unsigned long) (vbase_map[i]), - (unsigned long) (last-1)); - last = vbase_map[i]; - } - } -#endif - -#ifndef __tilegx__ - /* - * Convert from using one lock for all atomic operations to - * one per cpu. - */ - __init_atomic_per_cpu(); -#endif -} - -struct kmem_cache *pgd_cache; - -void __init pgtable_cache_init(void) -{ - pgd_cache = kmem_cache_create("pgd", SIZEOF_PGD, SIZEOF_PGD, 0, NULL); - if (!pgd_cache) - panic("pgtable_cache_init(): Cannot create pgd cache"); -} - -static long __ro_after_init initfree = 1; -static bool __ro_after_init set_initfree_done; - -/* Select whether to free (1) or mark unusable (0) the __init pages. */ -static int __init set_initfree(char *str) -{ - long val; - if (kstrtol(str, 0, &val) == 0) { - set_initfree_done = true; - initfree = val; - pr_info("initfree: %s free init pages\n", - initfree ? "will" : "won't"); - } - return 1; -} -__setup("initfree=", set_initfree); - -static void free_init_pages(char *what, unsigned long begin, unsigned long end) -{ - unsigned long addr = (unsigned long) begin; - - /* Prefer user request first */ - if (!set_initfree_done) { - if (debug_pagealloc_enabled()) - initfree = 0; - } - if (kdata_huge && !initfree) { - pr_warn("Warning: ignoring initfree=0: incompatible with kdata=huge\n"); - initfree = 1; - } - end = (end + PAGE_SIZE - 1) & PAGE_MASK; - local_flush_tlb_pages(NULL, begin, PAGE_SIZE, end - begin); - for (addr = begin; addr < end; addr += PAGE_SIZE) { - /* - * Note we just reset the home here directly in the - * page table. We know this is safe because our caller - * just flushed the caches on all the other cpus, - * and they won't be touching any of these pages. - */ - int pfn = kaddr_to_pfn((void *)addr); - struct page *page = pfn_to_page(pfn); - pte_t *ptep = virt_to_kpte(addr); - if (!initfree) { - /* - * If debugging page accesses then do not free - * this memory but mark them not present - any - * buggy init-section access will create a - * kernel page fault: - */ - pte_clear(&init_mm, addr, ptep); - continue; - } - if (pte_huge(*ptep)) - BUG_ON(!kdata_huge); - else - set_pte_at(&init_mm, addr, ptep, - pfn_pte(pfn, PAGE_KERNEL)); - memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); - free_reserved_page(page); - } - pr_info("Freeing %s: %ldk freed\n", what, (end - begin) >> 10); -} - -void free_initmem(void) -{ - const unsigned long text_delta = MEM_SV_START - PAGE_OFFSET; - - /* - * Evict the cache on all cores to avoid incoherence. - * We are guaranteed that no one will touch the init pages any more. - */ - homecache_evict(&cpu_cacheable_map); - - /* Free the data pages that we won't use again after init. */ - free_init_pages("unused kernel data", - (unsigned long)__init_begin, - (unsigned long)__init_end); - - /* - * Free the pages mapped from 0xc0000000 that correspond to code - * pages from MEM_SV_START that we won't use again after init. - */ - free_init_pages("unused kernel text", - (unsigned long)_sinittext - text_delta, - (unsigned long)_einittext - text_delta); - /* Do a global TLB flush so everyone sees the changes. */ - flush_tlb_all(); -} |