1b948d6cae
The zEC12 machines introduced the local-clearing control for the IDTE and IPTE instruction. If the control is set only the TLB of the local CPU is cleared of entries, either all entries of a single address space for IDTE, or the entry for a single page-table entry for IPTE. Without the local-clearing control the TLB flush is broadcasted to all CPUs in the configuration, which is expensive. The reset of the bit mask of the CPUs that need flushing after a non-local IDTE is tricky. As TLB entries for an address space remain in the TLB even if the address space is detached a new bit field is required to keep track of attached CPUs vs. CPUs in the need of a flush. After a non-local flush with IDTE the bit-field of attached CPUs is copied to the bit-field of CPUs in need of a flush. The ordering of operations on cpu_attach_mask, attach_count and mm_cpumask(mm) is such that an underindication in mm_cpumask(mm) is prevented but an overindication in mm_cpumask(mm) is possible. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
232 lines
5.7 KiB
C
232 lines
5.7 KiB
C
/*
|
|
* S390 version
|
|
* 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/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/swap.h>
|
|
#include <linux/smp.h>
|
|
#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/uaccess.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/lowcore.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/tlbflush.h>
|
|
#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)));
|
|
|
|
unsigned long empty_zero_page, zero_page_mask;
|
|
EXPORT_SYMBOL(empty_zero_page);
|
|
|
|
static void __init setup_zero_pages(void)
|
|
{
|
|
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++;
|
|
}
|
|
|
|
zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
|
|
}
|
|
|
|
/*
|
|
* paging_init() sets up the page tables
|
|
*/
|
|
void __init paging_init(void)
|
|
{
|
|
unsigned long max_zone_pfns[MAX_NR_ZONES];
|
|
unsigned long pgd_type, asce_bits;
|
|
|
|
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;
|
|
}
|
|
#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 */
|
|
__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);
|
|
}
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
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 = max_low_pfn;
|
|
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
|
|
|
|
/* Setup guest page hinting */
|
|
cmma_init();
|
|
|
|
/* this will put all low memory onto the freelists */
|
|
free_all_bootmem();
|
|
setup_zero_pages(); /* Setup zeroed pages. */
|
|
|
|
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)
|
|
{
|
|
free_initmem_default(POISON_FREE_INITMEM);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
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)
|
|
{
|
|
/*
|
|
* 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 */
|