diff options
Diffstat (limited to 'arch/s390/mm/init.c')
| -rw-r--r-- | arch/s390/mm/init.c | 412 |
1 files changed, 164 insertions, 248 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index df953383724..0c1073ed1e8 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -1,15 +1,12 @@ /* - * arch/s390/mm/init.c - * * S390 version - * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation + * Copyright IBM Corp. 1999 * Author(s): Hartmut Penner (hp@de.ibm.com) * * Derived from "arch/i386/mm/init.c" * Copyright (C) 1995 Linus Torvalds */ -#include <linux/config.h> #include <linux/signal.h> #include <linux/sched.h> #include <linux/kernel.h> @@ -24,9 +21,13 @@ #include <linux/init.h> #include <linux/pagemap.h> #include <linux/bootmem.h> - +#include <linux/memory.h> +#include <linux/pfn.h> +#include <linux/poison.h> +#include <linux/initrd.h> +#include <linux/export.h> +#include <linux/gfp.h> #include <asm/processor.h> -#include <asm/system.h> #include <asm/uaccess.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> @@ -34,282 +35,197 @@ #include <asm/lowcore.h> #include <asm/tlb.h> #include <asm/tlbflush.h> - -DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); +#include <asm/sections.h> +#include <asm/ctl_reg.h> +#include <asm/sclp.h> pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); -char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); -void diag10(unsigned long addr) -{ - if (addr >= 0x7ff00000) - return; -#ifdef CONFIG_64BIT - asm volatile ( - " sam31\n" - " diag %0,%0,0x10\n" - "0: sam64\n" - ".section __ex_table,\"a\"\n" - " .align 8\n" - " .quad 0b, 0b\n" - ".previous\n" - : : "a" (addr)); -#else - asm volatile ( - " diag %0,%0,0x10\n" - "0:\n" - ".section __ex_table,\"a\"\n" - " .align 4\n" - " .long 0b, 0b\n" - ".previous\n" - : : "a" (addr)); -#endif -} +unsigned long empty_zero_page, zero_page_mask; +EXPORT_SYMBOL(empty_zero_page); -void show_mem(void) +static void __init setup_zero_pages(void) { - int i, total = 0, reserved = 0; - int shared = 0, cached = 0; + struct cpuid cpu_id; + unsigned int order; + struct page *page; + int i; + + get_cpu_id(&cpu_id); + switch (cpu_id.machine) { + case 0x9672: /* g5 */ + case 0x2064: /* z900 */ + case 0x2066: /* z900 */ + case 0x2084: /* z990 */ + case 0x2086: /* z990 */ + case 0x2094: /* z9-109 */ + case 0x2096: /* z9-109 */ + order = 0; + break; + case 0x2097: /* z10 */ + case 0x2098: /* z10 */ + case 0x2817: /* z196 */ + case 0x2818: /* z196 */ + order = 2; + break; + case 0x2827: /* zEC12 */ + case 0x2828: /* zEC12 */ + default: + order = 5; + break; + } + /* Limit number of empty zero pages for small memory sizes */ + if (order > 2 && totalram_pages <= 16384) + order = 2; + + empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); + if (!empty_zero_page) + panic("Out of memory in setup_zero_pages"); + + page = virt_to_page((void *) empty_zero_page); + split_page(page, order); + for (i = 1 << order; i > 0; i--) { + mark_page_reserved(page); + page++; + } - printk("Mem-info:\n"); - show_free_areas(); - printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); - i = max_mapnr; - while (i-- > 0) { - total++; - if (PageReserved(mem_map+i)) - reserved++; - else if (PageSwapCache(mem_map+i)) - cached++; - else if (page_count(mem_map+i)) - shared += page_count(mem_map+i) - 1; - } - printk("%d pages of RAM\n",total); - printk("%d reserved pages\n",reserved); - printk("%d pages shared\n",shared); - printk("%d pages swap cached\n",cached); + zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; } -/* References to section boundaries */ - -extern unsigned long _text; -extern unsigned long _etext; -extern unsigned long _edata; -extern unsigned long __bss_start; -extern unsigned long _end; - -extern unsigned long __init_begin; -extern unsigned long __init_end; - -extern unsigned long __initdata zholes_size[]; /* * paging_init() sets up the page tables */ - -#ifndef CONFIG_64BIT -void __init paging_init(void) -{ - pgd_t * pg_dir; - pte_t * pg_table; - pte_t pte; - int i; - unsigned long tmp; - unsigned long pfn = 0; - unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; - static const int ssm_mask = 0x04000000L; - - /* unmap whole virtual address space */ - - pg_dir = swapper_pg_dir; - - for (i=0;i<KERNEL_PGD_PTRS;i++) - pmd_clear((pmd_t*)pg_dir++); - - /* - * map whole physical memory to virtual memory (identity mapping) - */ - - pg_dir = swapper_pg_dir; - - while (pfn < max_low_pfn) { - /* - * pg_table is physical at this point - */ - pg_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); - - pg_dir->pgd0 = (_PAGE_TABLE | __pa(pg_table)); - pg_dir->pgd1 = (_PAGE_TABLE | (__pa(pg_table)+1024)); - pg_dir->pgd2 = (_PAGE_TABLE | (__pa(pg_table)+2048)); - pg_dir->pgd3 = (_PAGE_TABLE | (__pa(pg_table)+3072)); - pg_dir++; - - for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) { - pte = pfn_pte(pfn, PAGE_KERNEL); - if (pfn >= max_low_pfn) - pte_clear(&init_mm, 0, &pte); - set_pte(pg_table, pte); - pfn++; - } - } - - S390_lowcore.kernel_asce = pgdir_k; - - /* enable virtual mapping in kernel mode */ - __asm__ __volatile__(" LCTL 1,1,%0\n" - " LCTL 7,7,%0\n" - " LCTL 13,13,%0\n" - " SSM %1" - : : "m" (pgdir_k), "m" (ssm_mask)); - - local_flush_tlb(); - - { - unsigned long zones_size[MAX_NR_ZONES]; - - memset(zones_size, 0, sizeof(zones_size)); - zones_size[ZONE_DMA] = max_low_pfn; - free_area_init_node(0, &contig_page_data, zones_size, - __pa(PAGE_OFFSET) >> PAGE_SHIFT, - zholes_size); - } - return; -} - -#else /* CONFIG_64BIT */ void __init paging_init(void) { - pgd_t * pg_dir; - pmd_t * pm_dir; - pte_t * pt_dir; - pte_t pte; - int i,j,k; - unsigned long pfn = 0; - unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | - _KERN_REGION_TABLE; - static const int ssm_mask = 0x04000000L; - - unsigned long zones_size[MAX_NR_ZONES]; - unsigned long dma_pfn, high_pfn; + unsigned long max_zone_pfns[MAX_NR_ZONES]; + unsigned long pgd_type, asce_bits; - memset(zones_size, 0, sizeof(zones_size)); - dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT; - high_pfn = max_low_pfn; - - if (dma_pfn > high_pfn) - zones_size[ZONE_DMA] = high_pfn; - else { - zones_size[ZONE_DMA] = dma_pfn; - zones_size[ZONE_NORMAL] = high_pfn - dma_pfn; + init_mm.pgd = swapper_pg_dir; +#ifdef CONFIG_64BIT + if (VMALLOC_END > (1UL << 42)) { + asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; + pgd_type = _REGION2_ENTRY_EMPTY; + } else { + asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; + pgd_type = _REGION3_ENTRY_EMPTY; } - - /* Initialize mem_map[]. */ - free_area_init_node(0, &contig_page_data, zones_size, - __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size); - - /* - * map whole physical memory to virtual memory (identity mapping) - */ - - pg_dir = swapper_pg_dir; - - for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) { - - if (pfn >= max_low_pfn) { - pgd_clear(pg_dir); - continue; - } - - pm_dir = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE*4); - pgd_populate(&init_mm, pg_dir, pm_dir); - - for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) { - if (pfn >= max_low_pfn) { - pmd_clear(pm_dir); - continue; - } - - pt_dir = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); - pmd_populate_kernel(&init_mm, pm_dir, pt_dir); - - for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) { - pte = pfn_pte(pfn, PAGE_KERNEL); - if (pfn >= max_low_pfn) { - pte_clear(&init_mm, 0, &pte); - continue; - } - set_pte(pt_dir, pte); - pfn++; - } - } - } - - S390_lowcore.kernel_asce = pgdir_k; +#else + asce_bits = _ASCE_TABLE_LENGTH; + pgd_type = _SEGMENT_ENTRY_EMPTY; +#endif + S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; + clear_table((unsigned long *) init_mm.pgd, pgd_type, + sizeof(unsigned long)*2048); + vmem_map_init(); /* enable virtual mapping in kernel mode */ - __asm__ __volatile__("lctlg 1,1,%0\n\t" - "lctlg 7,7,%0\n\t" - "lctlg 13,13,%0\n\t" - "ssm %1" - : :"m" (pgdir_k), "m" (ssm_mask)); - - local_flush_tlb(); - - return; + __ctl_load(S390_lowcore.kernel_asce, 1, 1); + __ctl_load(S390_lowcore.kernel_asce, 7, 7); + __ctl_load(S390_lowcore.kernel_asce, 13, 13); + arch_local_irq_restore(4UL << (BITS_PER_LONG - 8)); + + sparse_memory_present_with_active_regions(MAX_NUMNODES); + sparse_init(); + memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); + max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); + max_zone_pfns[ZONE_NORMAL] = max_low_pfn; + free_area_init_nodes(max_zone_pfns); } -#endif /* CONFIG_64BIT */ void __init mem_init(void) { - unsigned long codesize, reservedpages, datasize, initsize; + if (MACHINE_HAS_TLB_LC) + cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask); + cpumask_set_cpu(0, mm_cpumask(&init_mm)); + atomic_set(&init_mm.context.attach_count, 1); - max_mapnr = num_physpages = max_low_pfn; + max_mapnr = max_low_pfn; high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); - /* clear the zero-page */ - memset(empty_zero_page, 0, PAGE_SIZE); + /* Setup guest page hinting */ + cmma_init(); /* this will put all low memory onto the freelists */ - totalram_pages += free_all_bootmem(); - - reservedpages = 0; + free_all_bootmem(); + setup_zero_pages(); /* Setup zeroed pages. */ - codesize = (unsigned long) &_etext - (unsigned long) &_text; - datasize = (unsigned long) &_edata - (unsigned long) &_etext; - initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; - printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", - (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), - max_mapnr << (PAGE_SHIFT-10), - codesize >> 10, - reservedpages << (PAGE_SHIFT-10), - datasize >>10, - initsize >> 10); + mem_init_print_info(NULL); + printk("Write protected kernel read-only data: %#lx - %#lx\n", + (unsigned long)&_stext, + PFN_ALIGN((unsigned long)&_eshared) - 1); } void free_initmem(void) { - unsigned long addr; - - addr = (unsigned long)(&__init_begin); - for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { - ClearPageReserved(virt_to_page(addr)); - set_page_count(virt_to_page(addr), 1); - free_page(addr); - totalram_pages++; - } - printk ("Freeing unused kernel memory: %ldk freed\n", - ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); + free_initmem_default(POISON_FREE_INITMEM); } #ifdef CONFIG_BLK_DEV_INITRD -void free_initrd_mem(unsigned long start, unsigned long end) +void __init free_initrd_mem(unsigned long start, unsigned long end) +{ + free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, + "initrd"); +} +#endif + +#ifdef CONFIG_MEMORY_HOTPLUG +int arch_add_memory(int nid, u64 start, u64 size) +{ + unsigned long zone_start_pfn, zone_end_pfn, nr_pages; + unsigned long start_pfn = PFN_DOWN(start); + unsigned long size_pages = PFN_DOWN(size); + struct zone *zone; + int rc; + + rc = vmem_add_mapping(start, size); + if (rc) + return rc; + for_each_zone(zone) { + if (zone_idx(zone) != ZONE_MOVABLE) { + /* Add range within existing zone limits */ + zone_start_pfn = zone->zone_start_pfn; + zone_end_pfn = zone->zone_start_pfn + + zone->spanned_pages; + } else { + /* Add remaining range to ZONE_MOVABLE */ + zone_start_pfn = start_pfn; + zone_end_pfn = start_pfn + size_pages; + } + if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn) + continue; + nr_pages = (start_pfn + size_pages > zone_end_pfn) ? + zone_end_pfn - start_pfn : size_pages; + rc = __add_pages(nid, zone, start_pfn, nr_pages); + if (rc) + break; + start_pfn += nr_pages; + size_pages -= nr_pages; + if (!size_pages) + break; + } + if (rc) + vmem_remove_mapping(start, size); + return rc; +} + +unsigned long memory_block_size_bytes(void) +{ + /* + * Make sure the memory block size is always greater + * or equal than the memory increment size. + */ + return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp_get_rzm()); +} + +#ifdef CONFIG_MEMORY_HOTREMOVE +int arch_remove_memory(u64 start, u64 size) { - if (start < end) - printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); - for (; start < end; start += PAGE_SIZE) { - ClearPageReserved(virt_to_page(start)); - set_page_count(virt_to_page(start), 1); - free_page(start); - totalram_pages++; - } + /* + * There is no hardware or firmware interface which could trigger a + * hot memory remove on s390. So there is nothing that needs to be + * implemented. + */ + return -EBUSY; } #endif +#endif /* CONFIG_MEMORY_HOTPLUG */ |