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Some of the SN code & #defines related to compact nodes & IO discovery have gotten stale over the years. This patch attempts to clean them up. Some of the various SN MAX_xxx #defines were also unclear & misused. The primary changes are: - use MAX_NUMNODES. This is the generic linux #define for the number of nodes that are known to the generic kernel. Arrays & loops for constructs that are 1:1 with linux-defined nodes should use the linux #define - not an SN equivalent. - use MAX_COMPACT_NODES for MAX_NUMNODES + NUM_TIOS. This is the number of nodes in the SSI system. Compact nodes are a hack to get around the IA64 architectural limit of 256 nodes. Large SGI systems have more than 256 nodes. When we upgrade to ACPI3.0, I _hope_ that all nodes will be real nodes that are known to the generic kernel. That will allow us to delete the notion of "compact nodes". - add MAX_NUMALINK_NODES for the total number of nodes that are in the numalink domain - all partitions. - simplified (understandable) scan_for_ionodes() - small amount of cleanup related to cnodes Signed-off-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
134 lines
4.3 KiB
C
134 lines
4.3 KiB
C
/*
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved.
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*/
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#ifndef _ASM_IA64_SN_SN_CPUID_H
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#define _ASM_IA64_SN_SN_CPUID_H
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#include <linux/config.h>
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#include <linux/smp.h>
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#include <asm/sn/addrs.h>
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#include <asm/sn/pda.h>
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#include <asm/intrinsics.h>
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/*
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* Functions for converting between cpuids, nodeids and NASIDs.
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*
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* These are for SGI platforms only.
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*
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*/
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/*
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* Definitions of terms (these definitions are for IA64 ONLY. Other architectures
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* use cpuid/cpunum quite defferently):
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*
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* CPUID - a number in range of 0..NR_CPUS-1 that uniquely identifies
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* the cpu. The value cpuid has no significance on IA64 other than
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* the boot cpu is 0.
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* smp_processor_id() returns the cpuid of the current cpu.
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*
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* CPU_PHYSICAL_ID (also known as HARD_PROCESSOR_ID)
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* This is the same as 31:24 of the processor LID register
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* hard_smp_processor_id()- cpu_physical_id of current processor
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* cpu_physical_id(cpuid) - convert a <cpuid> to a <physical_cpuid>
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* cpu_logical_id(phy_id) - convert a <physical_cpuid> to a <cpuid>
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* * not real efficient - don't use in perf critical code
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*
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* SLICE - a number in the range of 0 - 3 (typically) that represents the
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* cpu number on a brick.
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*
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* SUBNODE - (almost obsolete) the number of the FSB that a cpu is
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* connected to. This is also the same as the PI number. Usually 0 or 1.
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*
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* NOTE!!!: the value of the bits in the cpu physical id (SAPICid or LID) of a cpu has no
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* significance. The SAPIC id (LID) is a 16-bit cookie that has meaning only to the PROM.
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*
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*
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* The macros convert between cpu physical ids & slice/nasid/cnodeid.
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* These terms are described below:
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*
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*
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* Brick
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* ----- ----- ----- ----- CPU
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* | 0 | | 1 | | 0 | | 1 | SLICE
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* ----- ----- ----- -----
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* | | | |
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* | | | |
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* 0 | | 2 0 | | 2 FSB SLOT
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* ------- -------
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* | |
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* | |
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* | |
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* ------------ -------------
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* | | | |
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* | SHUB | | SHUB | NASID (0..MAX_NASIDS)
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* | |----- | | CNODEID (0..num_compact_nodes-1)
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* | | | |
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* | | | |
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* ------------ -------------
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* | |
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*
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*
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*/
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#define get_node_number(addr) NASID_GET(addr)
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/*
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* NOTE: on non-MP systems, only cpuid 0 exists
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*/
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extern short physical_node_map[]; /* indexed by nasid to get cnode */
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/*
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* Macros for retrieving info about current cpu
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*/
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#define get_nasid() (sn_nodepda->phys_cpuid[smp_processor_id()].nasid)
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#define get_subnode() (sn_nodepda->phys_cpuid[smp_processor_id()].subnode)
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#define get_slice() (sn_nodepda->phys_cpuid[smp_processor_id()].slice)
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#define get_cnode() (sn_nodepda->phys_cpuid[smp_processor_id()].cnode)
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#define get_sapicid() ((ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff)
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/*
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* Macros for retrieving info about an arbitrary cpu
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* cpuid - logical cpu id
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*/
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#define cpuid_to_nasid(cpuid) (sn_nodepda->phys_cpuid[cpuid].nasid)
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#define cpuid_to_subnode(cpuid) (sn_nodepda->phys_cpuid[cpuid].subnode)
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#define cpuid_to_slice(cpuid) (sn_nodepda->phys_cpuid[cpuid].slice)
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/*
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* Dont use the following in performance critical code. They require scans
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* of potentially large tables.
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*/
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extern int nasid_slice_to_cpuid(int, int);
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/*
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* cnodeid_to_nasid - convert a cnodeid to a NASID
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*/
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#define cnodeid_to_nasid(cnodeid) (sn_cnodeid_to_nasid[cnodeid])
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/*
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* nasid_to_cnodeid - convert a NASID to a cnodeid
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*/
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#define nasid_to_cnodeid(nasid) (physical_node_map[nasid])
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/*
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* partition_coherence_id - get the coherence ID of the current partition
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*/
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extern u8 sn_coherency_id;
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#define partition_coherence_id() (sn_coherency_id)
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#endif /* _ASM_IA64_SN_SN_CPUID_H */
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