numa.h

Go to the documentation of this file.

/*
 * 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 prototypes and definitions.
 *
 * 2002/08/05 Erich Focht <[email protected]>
 *
 */
#ifndef _ASM_IA64_NUMA_H
#define _ASM_IA64_NUMA_H


#ifdef CONFIG_NUMA

#include <linux/cache.h>
#include <linux/cpumask.h>
#include <linux/numa.h>
#include <linux/smp.h>
#include <linux/threads.h>

#include <asm/mmzone.h>

extern u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned;
extern cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
extern pg_data_t *pgdat_list[MAX_NUMNODES];

/* Stuff below this line could be architecture independent */

extern int num_node_memblks;        /* total number of memory chunks */

/*
 * List of node memory chunks. Filled when parsing SRAT table to
 * obtain information about memory nodes.
*/

struct node_memblk_s {
    unsigned long start_paddr;
    unsigned long size;
    int nid;        /* which logical node contains this chunk? */
    int bank;       /* which mem bank on this node */
};

struct node_cpuid_s {
    u16 phys_id;    /* id << 8 | eid */
    int nid;        /* logical node containing this CPU */
};

extern struct node_memblk_s node_memblk[NR_NODE_MEMBLKS];
extern struct node_cpuid_s node_cpuid[NR_CPUS];

/*
 * ACPI 2.0 SLIT (System Locality Information Table)
 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 *
 * This is a matrix with "distances" between nodes, they should be
 * proportional to the memory access latency ratios.
 */

extern u8 numa_slit[MAX_NUMNODES * MAX_NUMNODES];
#define node_distance(from,to) (numa_slit[(from) * MAX_NUMNODES + (to)])

extern int paddr_to_nid(unsigned long paddr);

#define local_nodeid (cpu_to_node_map[smp_processor_id()])

extern void map_cpu_to_node(int cpu, int nid);
extern void unmap_cpu_from_node(int cpu, int nid);


#else /* !CONFIG_NUMA */
#define map_cpu_to_node(cpu, nid)   do{}while(0)
#define unmap_cpu_from_node(cpu, nid)   do{}while(0)

#define paddr_to_nid(addr)  0

#endif /* CONFIG_NUMA */

#endif /* _ASM_IA64_NUMA_H */