numa.c

/* 
 * Generic VM initialization for x86-64 NUMA setups.
 * Copyright 2002,2003 Andi Kleen, SuSE Labs.
 */ 
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mmzone.h>
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/nodemask.h>

#include <asm/e820.h>
#include <asm/proto.h>
#include <asm/dma.h>
#include <asm/numa.h>
#include <asm/acpi.h>

#ifndef Dprintk
#define Dprintk(x...)
#endif

struct pglist_data *node_data[MAX_NUMNODES];
bootmem_data_t plat_node_bdata[MAX_NUMNODES];

int memnode_shift;
u8  memnodemap[NODEMAPSIZE];

unsigned char cpu_to_node[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
cpumask_t     node_to_cpumask[MAX_NUMNODES];

int numa_off __initdata;

int __init compute_hash_shift(struct node *nodes, int numnodes)
{
	int i; 
	int shift = 24;
	u64 addr;
	
	/* When in doubt use brute force. */
	while (shift < 48) { 
		memset(memnodemap,0xff,sizeof(*memnodemap) * NODEMAPSIZE); 
		for (i = 0; i < numnodes; i++) {
			if (nodes[i].start == nodes[i].end) 
				continue;
			for (addr = nodes[i].start; 
			     addr < nodes[i].end; 
			     addr += (1UL << shift)) {
				if (memnodemap[addr >> shift] != 0xff && 
				    memnodemap[addr >> shift] != i) { 
					printk(KERN_INFO 
					    "node %d shift %d addr %Lx conflict %d\n", 
					       i, shift, addr, memnodemap[addr>>shift]);
					goto next; 
				} 
				memnodemap[addr >> shift] = i; 
			} 
		} 
		return shift; 
	next:
		shift++; 
	} 
	memset(memnodemap,0,sizeof(*memnodemap) * NODEMAPSIZE); 
	return -1; 
}

/* Initialize bootmem allocator for a node */
void __init setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
{ 
	unsigned long start_pfn, end_pfn, bootmap_pages, bootmap_size, bootmap_start; 
	unsigned long nodedata_phys;
	const int pgdat_size = round_up(sizeof(pg_data_t), PAGE_SIZE);

	start = round_up(start, ZONE_ALIGN); 

	printk("Bootmem setup node %d %016lx-%016lx\n", nodeid, start, end);

	start_pfn = start >> PAGE_SHIFT;
	end_pfn = end >> PAGE_SHIFT;

	nodedata_phys = find_e820_area(start, end, pgdat_size); 
	if (nodedata_phys == -1L) 
		panic("Cannot find memory pgdat in node %d\n", nodeid);

	Dprintk("nodedata_phys %lx\n", nodedata_phys); 

	node_data[nodeid] = phys_to_virt(nodedata_phys);
	memset(NODE_DATA(nodeid), 0, sizeof(pg_data_t));
	NODE_DATA(nodeid)->bdata = &plat_node_bdata[nodeid];
	NODE_DATA(nodeid)->node_start_pfn = start_pfn;
	NODE_DATA(nodeid)->node_spanned_pages = end_pfn - start_pfn;

	/* Find a place for the bootmem map */
	bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 
	bootmap_start = round_up(nodedata_phys + pgdat_size, PAGE_SIZE);
	bootmap_start = find_e820_area(bootmap_start, end, bootmap_pages<<PAGE_SHIFT);
	if (bootmap_start == -1L) 
		panic("Not enough continuous space for bootmap on node %d", nodeid); 
	Dprintk("bootmap start %lu pages %lu\n", bootmap_start, bootmap_pages); 
	
	bootmap_size = init_bootmem_node(NODE_DATA(nodeid),
					 bootmap_start >> PAGE_SHIFT, 
					 start_pfn, end_pfn); 

	e820_bootmem_free(NODE_DATA(nodeid), start, end);

	reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys, pgdat_size); 
	reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start, bootmap_pages<<PAGE_SHIFT);
	node_set_online(nodeid);
} 

/* Initialize final allocator for a zone */
void __init setup_node_zones(int nodeid)
{ 
	unsigned long start_pfn, end_pfn; 
	unsigned long zones[MAX_NR_ZONES];
	unsigned long dma_end_pfn;

	memset(zones, 0, sizeof(unsigned long) * MAX_NR_ZONES); 

	start_pfn = node_start_pfn(nodeid);
	end_pfn = node_end_pfn(nodeid);

	Dprintk(KERN_INFO "setting up node %d %lx-%lx\n", nodeid, start_pfn, end_pfn);
	
	/* All nodes > 0 have a zero length zone DMA */ 
	dma_end_pfn = __pa(MAX_DMA_ADDRESS) >> PAGE_SHIFT; 
	if (start_pfn < dma_end_pfn) { 
		zones[ZONE_DMA] = dma_end_pfn - start_pfn;
		zones[ZONE_NORMAL] = end_pfn - dma_end_pfn; 
	} else { 
		zones[ZONE_NORMAL] = end_pfn - start_pfn; 
	} 
    
	free_area_init_node(nodeid, NODE_DATA(nodeid), zones,
			    start_pfn, NULL); 
} 

void __init numa_init_array(void)
{
	int rr, i;
	/* There are unfortunately some poorly designed mainboards around
	   that only connect memory to a single CPU. This breaks the 1:1 cpu->node
	   mapping. To avoid this fill in the mapping for all possible
	   CPUs, as the number of CPUs is not known yet. 
	   We round robin the existing nodes. */
	rr = 0;
	for (i = 0; i < NR_CPUS; i++) {
		if (cpu_to_node[i] != NUMA_NO_NODE)
			continue;
		rr = next_node(rr, node_online_map);
		if (rr == MAX_NUMNODES)
			rr = first_node(node_online_map);
		cpu_to_node[i] = rr;
		rr++; 
	}

	set_bit(0, &node_to_cpumask[cpu_to_node(0)]);
}

#ifdef CONFIG_NUMA_EMU
int numa_fake __initdata = 0;

/* Numa emulation */
static int numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
{
 	int i;
 	struct node nodes[MAX_NUMNODES];
 	unsigned long sz = ((end_pfn - start_pfn)<<PAGE_SHIFT) / numa_fake;

 	/* Kludge needed for the hash function */
 	if (hweight64(sz) > 1) {
 		unsigned long x = 1;
 		while ((x << 1) < sz)
 			x <<= 1;
 		if (x < sz/2)
 			printk("Numa emulation unbalanced. Complain to maintainer\n");
 		sz = x;
 	}

 	memset(&nodes,0,sizeof(nodes));
 	for (i = 0; i < numa_fake; i++) {
 		nodes[i].start = (start_pfn<<PAGE_SHIFT) + i*sz;
 		if (i == numa_fake-1)
 			sz = (end_pfn<<PAGE_SHIFT) - nodes[i].start;
 		nodes[i].end = nodes[i].start + sz;
 		if (i != numa_fake-1)
 			nodes[i].end--;
 		printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n",
 		       i,
 		       nodes[i].start, nodes[i].end,
 		       (nodes[i].end - nodes[i].start) >> 20);
		node_set_online(i);
 	}
 	memnode_shift = compute_hash_shift(nodes, numa_fake);
 	if (memnode_shift < 0) {
 		memnode_shift = 0;
 		printk(KERN_ERR "No NUMA hash function found. Emulation disabled.\n");
 		return -1;
 	}
 	for_each_online_node(i)
 		setup_node_bootmem(i, nodes[i].start, nodes[i].end);
 	numa_init_array();
 	return 0;
}
#endif

void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
{ 
	int i;

#ifdef CONFIG_NUMA_EMU
	if (numa_fake && !numa_emulation(start_pfn, end_pfn))
 		return;
#endif

#ifdef CONFIG_ACPI_NUMA
	if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT,
					  end_pfn << PAGE_SHIFT))
 		return;
#endif

#ifdef CONFIG_K8_NUMA
	if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT))
		return;
#endif
	printk(KERN_INFO "%s\n",
	       numa_off ? "NUMA turned off" : "No NUMA configuration found");

	printk(KERN_INFO "Faking a node at %016lx-%016lx\n", 
	       start_pfn << PAGE_SHIFT,
	       end_pfn << PAGE_SHIFT); 
		/* setup dummy node covering all memory */ 
	memnode_shift = 63; 
	memnodemap[0] = 0;
	nodes_clear(node_online_map);
	node_set_online(0);
	for (i = 0; i < NR_CPUS; i++)
		cpu_to_node[i] = 0;
	node_to_cpumask[0] = cpumask_of_cpu(0);
	setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
}

__init void numa_add_cpu(int cpu)
{
	/* BP is initialized elsewhere */
	if (cpu) 
		set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]);
} 

unsigned long __init numa_free_all_bootmem(void) 
{ 
	int i;
	unsigned long pages = 0;
	for_each_online_node(i) {
		pages += free_all_bootmem_node(NODE_DATA(i));
	}
	return pages;
} 

void __init paging_init(void)
{ 
	int i;
	for_each_online_node(i) {
		setup_node_zones(i); 
	}
} 

/* [numa=off] */
__init int numa_setup(char *opt) 
{ 
	if (!strncmp(opt,"off",3))
		numa_off = 1;
#ifdef CONFIG_NUMA_EMU
	if(!strncmp(opt, "fake=", 5)) {
		numa_fake = simple_strtoul(opt+5,NULL,0); ;
		if (numa_fake >= MAX_NUMNODES)
			numa_fake = MAX_NUMNODES;
	}
#endif
#ifdef CONFIG_ACPI_NUMA
 	if (!strncmp(opt,"noacpi",6))
 		acpi_numa = -1;
#endif
	return 1;
} 

EXPORT_SYMBOL(cpu_to_node);
EXPORT_SYMBOL(node_to_cpumask);
EXPORT_SYMBOL(memnode_shift);
EXPORT_SYMBOL(memnodemap);
EXPORT_SYMBOL(node_data);