[linux-2.6-block.git] / arch / ia64 / mm / numa.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * This file contains NUMA specific variables and functions which can
 * be split away from DISCONTIGMEM and are used on NUMA machines with
 * contiguous memory.
 * 
 *                         2002/08/07 Erich Focht <efocht@ess.nec.de>
 */

#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/node.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/module.h>
#include <asm/mmzone.h>
#include <asm/numa.h>


/*
 * The following structures are usually initialized by ACPI or
 * similar mechanisms and describe the NUMA characteristics of the machine.
 */
int num_node_memblks;
struct node_memblk_s node_memblk[NR_NODE_MEMBLKS];
struct node_cpuid_s node_cpuid[NR_CPUS] =
	{ [0 ... NR_CPUS-1] = { .phys_id = 0, .nid = NUMA_NO_NODE } };

/*
 * This is a matrix with "distances" between nodes, they should be
 * proportional to the memory access latency ratios.
 */
u8 numa_slit[MAX_NUMNODES * MAX_NUMNODES];

/* Identify which cnode a physical address resides on */
int
paddr_to_nid(unsigned long paddr)
{
	int	i;

	for (i = 0; i < num_node_memblks; i++)
		if (paddr >= node_memblk[i].start_paddr &&
		    paddr < node_memblk[i].start_paddr + node_memblk[i].size)
			break;

	return (i < num_node_memblks) ? node_memblk[i].nid : (num_node_memblks ? -1 : 0);
}

#if defined(CONFIG_SPARSEMEM) && defined(CONFIG_NUMA)
/*
 * Because of holes evaluate on section limits.
 * If the section of memory exists, then return the node where the section
 * resides.  Otherwise return node 0 as the default.  This is used by
 * SPARSEMEM to allocate the SPARSEMEM sectionmap on the NUMA node where
 * the section resides.
 */
int __meminit __early_pfn_to_nid(unsigned long pfn)
{
	int i, section = pfn >> PFN_SECTION_SHIFT, ssec, esec;
	/*
	 * NOTE: The following SMP-unsafe globals are only used early in boot
	 * when the kernel is running single-threaded.
	 */
	static int __meminitdata last_ssec, last_esec;
	static int __meminitdata last_nid;

	if (section >= last_ssec && section < last_esec)
		return last_nid;

	for (i = 0; i < num_node_memblks; i++) {
		ssec = node_memblk[i].start_paddr >> PA_SECTION_SHIFT;
		esec = (node_memblk[i].start_paddr + node_memblk[i].size +
			((1L << PA_SECTION_SHIFT) - 1)) >> PA_SECTION_SHIFT;
		if (section >= ssec && section < esec) {
			last_ssec = ssec;
			last_esec = esec;
			last_nid = node_memblk[i].nid;
			return node_memblk[i].nid;
		}
	}

	return -1;
}

void numa_clear_node(int cpu)
{
	unmap_cpu_from_node(cpu, NUMA_NO_NODE);
}

#ifdef CONFIG_MEMORY_HOTPLUG
/*
 *  SRAT information is stored in node_memblk[], then we can use SRAT
 *  information at memory-hot-add if necessary.
 */

int memory_add_physaddr_to_nid(u64 addr)
{
	int nid = paddr_to_nid(addr);
	if (nid < 0)
		return 0;
	return nid;
}

EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* This file contains NUMA specific variables and functions which can
	7	* be split away from DISCONTIGMEM and are used on NUMA machines with
	8	* contiguous memory.
	9	*
	10	* 2002/08/07 Erich Focht <efocht@ess.nec.de>
	11	*/
	12
1da177e4 LT	13	#include <linux/cpu.h>
	14	#include <linux/kernel.h>
	15	#include <linux/mm.h>
	16	#include <linux/node.h>
	17	#include <linux/init.h>
	18	#include <linux/bootmem.h>
8c2676a5	19	#include <linux/module.h>
1da177e4 LT	20	#include <asm/mmzone.h>
	21	#include <asm/numa.h>
	22
	23
	24	/*
	25	* The following structures are usually initialized by ACPI or
	26	* similar mechanisms and describe the NUMA characteristics of the machine.
	27	*/
	28	int num_node_memblks;
	29	struct node_memblk_s node_memblk[NR_NODE_MEMBLKS];
2c6e6db4	30	struct node_cpuid_s node_cpuid[NR_CPUS] =
	31	{ [0 ... NR_CPUS-1] = { .phys_id = 0, .nid = NUMA_NO_NODE } };
	32
1da177e4 LT	33	/*
	34	* This is a matrix with "distances" between nodes, they should be
	35	* proportional to the memory access latency ratios.
	36	*/
	37	u8 numa_slit[MAX_NUMNODES * MAX_NUMNODES];
	38
	39	/* Identify which cnode a physical address resides on */
	40	int
	41	paddr_to_nid(unsigned long paddr)
	42	{
	43	int i;
	44
	45	for (i = 0; i < num_node_memblks; i++)
	46	if (paddr >= node_memblk[i].start_paddr &&
	47	paddr < node_memblk[i].start_paddr + node_memblk[i].size)
	48	break;
	49
	50	return (i < num_node_memblks) ? node_memblk[i].nid : (num_node_memblks ? -1 : 0);
	51	}
2d4b1fa2 BP	52
	53	#if defined(CONFIG_SPARSEMEM) && defined(CONFIG_NUMA)
	54	/*
	55	* Because of holes evaluate on section limits.
	56	* If the section of memory exists, then return the node where the section
	57	* resides. Otherwise return node 0 as the default. This is used by
	58	* SPARSEMEM to allocate the SPARSEMEM sectionmap on the NUMA node where
	59	* the section resides.
	60	*/
f2dbcfa7	61	int __meminit __early_pfn_to_nid(unsigned long pfn)
2d4b1fa2 BP	62	{
2d4b1fa2 BP	63	int i, section = pfn >> PFN_SECTION_SHIFT, ssec, esec;
7c243c71 RA	64	/*
	65	* NOTE: The following SMP-unsafe globals are only used early in boot
	66	* when the kernel is running single-threaded.
	67	*/
	68	static int __meminitdata last_ssec, last_esec;
	69	static int __meminitdata last_nid;
	70
	71	if (section >= last_ssec && section < last_esec)
	72	return last_nid;
2d4b1fa2 BP	73
	74	for (i = 0; i < num_node_memblks; i++) {
	75	ssec = node_memblk[i].start_paddr >> PA_SECTION_SHIFT;
	76	esec = (node_memblk[i].start_paddr + node_memblk[i].size +
	77	((1L << PA_SECTION_SHIFT) - 1)) >> PA_SECTION_SHIFT;
7c243c71 RA	78	if (section >= ssec && section < esec) {
	79	last_ssec = ssec;
	80	last_esec = esec;
	81	last_nid = node_memblk[i].nid;
2d4b1fa2	82	return node_memblk[i].nid;
7c243c71	83	}
2d4b1fa2 BP	84	}
2d4b1fa2 BP	85
cc2559bc	86	return -1;
2d4b1fa2	87	}
8c2676a5	88
ccce9bb8	89	void numa_clear_node(int cpu)
eee46b3d YW	90	{
	91	unmap_cpu_from_node(cpu, NUMA_NO_NODE);
	92	}
	93
8c2676a5 KM	94	#ifdef CONFIG_MEMORY_HOTPLUG
	95	/*
	96	* SRAT information is stored in node_memblk[], then we can use SRAT
	97	* information at memory-hot-add if necessary.
	98	*/
	99
	100	int memory_add_physaddr_to_nid(u64 addr)
	101	{
	102	int nid = paddr_to_nid(addr);
	103	if (nid < 0)
	104	return 0;
	105	return nid;
	106	}
	107
	108	EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
	109	#endif
2d4b1fa2	110	#endif