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diff --git a/arch/ia64/include/asm/sn/sn2/sn_hwperf.h b/arch/ia64/include/asm/sn/sn2/sn_hwperf.h
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+/*
+ * 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.
+ *
+ * Copyright (C) 2004 Silicon Graphics, Inc. All rights reserved.
+ *
+ * Data types used by the SN_SAL_HWPERF_OP SAL call for monitoring
+ * SGI Altix node and router hardware
+ *
+ * Mark Goodwin <markgw@sgi.com> Mon Aug 30 12:23:46 EST 2004
+ */
+
+#ifndef SN_HWPERF_H
+#define SN_HWPERF_H
+
+/*
+ * object structure. SN_HWPERF_ENUM_OBJECTS and SN_HWPERF_GET_CPU_INFO
+ * return an array of these. Do not change this without also
+ * changing the corresponding SAL code.
+ */
+#define SN_HWPERF_MAXSTRING 128
+struct sn_hwperf_object_info {
+ u32 id;
+ union {
+ struct {
+ u64 this_part:1;
+ u64 is_shared:1;
+ } fields;
+ struct {
+ u64 flags;
+ u64 reserved;
+ } b;
+ } f;
+ char name[SN_HWPERF_MAXSTRING];
+ char location[SN_HWPERF_MAXSTRING];
+ u32 ports;
+};
+
+#define sn_hwp_this_part f.fields.this_part
+#define sn_hwp_is_shared f.fields.is_shared
+#define sn_hwp_flags f.b.flags
+
+/* macros for object classification */
+#define SN_HWPERF_IS_NODE(x) ((x) && strstr((x)->name, "SHub"))
+#define SN_HWPERF_IS_NODE_SHUB2(x) ((x) && strstr((x)->name, "SHub 2."))
+#define SN_HWPERF_IS_IONODE(x) ((x) && strstr((x)->name, "TIO"))
+#define SN_HWPERF_IS_NL3ROUTER(x) ((x) && strstr((x)->name, "NL3Router"))
+#define SN_HWPERF_IS_NL4ROUTER(x) ((x) && strstr((x)->name, "NL4Router"))
+#define SN_HWPERF_IS_OLDROUTER(x) ((x) && strstr((x)->name, "Router"))
+#define SN_HWPERF_IS_ROUTER(x) (SN_HWPERF_IS_NL3ROUTER(x) || \
+ SN_HWPERF_IS_NL4ROUTER(x) || \
+ SN_HWPERF_IS_OLDROUTER(x))
+#define SN_HWPERF_FOREIGN(x) ((x) && !(x)->sn_hwp_this_part && !(x)->sn_hwp_is_shared)
+#define SN_HWPERF_SAME_OBJTYPE(x,y) ((SN_HWPERF_IS_NODE(x) && SN_HWPERF_IS_NODE(y)) ||\
+ (SN_HWPERF_IS_IONODE(x) && SN_HWPERF_IS_IONODE(y)) ||\
+ (SN_HWPERF_IS_ROUTER(x) && SN_HWPERF_IS_ROUTER(y)))
+
+/* numa port structure, SN_HWPERF_ENUM_PORTS returns an array of these */
+struct sn_hwperf_port_info {
+ u32 port;
+ u32 conn_id;
+ u32 conn_port;
+};
+
+/* for HWPERF_{GET,SET}_MMRS */
+struct sn_hwperf_data {
+ u64 addr;
+ u64 data;
+};
+
+/* user ioctl() argument, see below */
+struct sn_hwperf_ioctl_args {
+ u64 arg; /* argument, usually an object id */
+ u64 sz; /* size of transfer */
+ void *ptr; /* pointer to source/target */
+ u32 v0; /* second return value */
+};
+
+/*
+ * For SN_HWPERF_{GET,SET}_MMRS and SN_HWPERF_OBJECT_DISTANCE,
+ * sn_hwperf_ioctl_args.arg can be used to specify a CPU on which
+ * to call SAL, and whether to use an interprocessor interrupt
+ * or task migration in order to do so. If the CPU specified is
+ * SN_HWPERF_ARG_ANY_CPU, then the current CPU will be used.
+ */
+#define SN_HWPERF_ARG_ANY_CPU 0x7fffffffUL
+#define SN_HWPERF_ARG_CPU_MASK 0x7fffffff00000000ULL
+#define SN_HWPERF_ARG_USE_IPI_MASK 0x8000000000000000ULL
+#define SN_HWPERF_ARG_OBJID_MASK 0x00000000ffffffffULL
+
+/*
+ * ioctl requests on the "sn_hwperf" misc device that call SAL.
+ */
+#define SN_HWPERF_OP_MEM_COPYIN 0x1000
+#define SN_HWPERF_OP_MEM_COPYOUT 0x2000
+#define SN_HWPERF_OP_MASK 0x0fff
+
+/*
+ * Determine mem requirement.
+ * arg don't care
+ * sz 8
+ * p pointer to u64 integer
+ */
+#define SN_HWPERF_GET_HEAPSIZE 1
+
+/*
+ * Install mem for SAL drvr
+ * arg don't care
+ * sz sizeof buffer pointed to by p
+ * p pointer to buffer for scratch area
+ */
+#define SN_HWPERF_INSTALL_HEAP 2
+
+/*
+ * Determine number of objects
+ * arg don't care
+ * sz 8
+ * p pointer to u64 integer
+ */
+#define SN_HWPERF_OBJECT_COUNT (10|SN_HWPERF_OP_MEM_COPYOUT)
+
+/*
+ * Determine object "distance", relative to a cpu. This operation can
+ * execute on a designated logical cpu number, using either an IPI or
+ * via task migration. If the cpu number is SN_HWPERF_ANY_CPU, then
+ * the current CPU is used. See the SN_HWPERF_ARG_* macros above.
+ *
+ * arg bitmap of IPI flag, cpu number and object id
+ * sz 8
+ * p pointer to u64 integer
+ */
+#define SN_HWPERF_OBJECT_DISTANCE (11|SN_HWPERF_OP_MEM_COPYOUT)
+
+/*
+ * Enumerate objects. Special case if sz == 8, returns the required
+ * buffer size.
+ * arg don't care
+ * sz sizeof buffer pointed to by p
+ * p pointer to array of struct sn_hwperf_object_info
+ */
+#define SN_HWPERF_ENUM_OBJECTS (12|SN_HWPERF_OP_MEM_COPYOUT)
+
+/*
+ * Enumerate NumaLink ports for an object. Special case if sz == 8,
+ * returns the required buffer size.
+ * arg object id
+ * sz sizeof buffer pointed to by p
+ * p pointer to array of struct sn_hwperf_port_info
+ */
+#define SN_HWPERF_ENUM_PORTS (13|SN_HWPERF_OP_MEM_COPYOUT)
+
+/*
+ * SET/GET memory mapped registers. These operations can execute
+ * on a designated logical cpu number, using either an IPI or via
+ * task migration. If the cpu number is SN_HWPERF_ANY_CPU, then
+ * the current CPU is used. See the SN_HWPERF_ARG_* macros above.
+ *
+ * arg bitmap of ipi flag, cpu number and object id
+ * sz sizeof buffer pointed to by p
+ * p pointer to array of struct sn_hwperf_data
+ */
+#define SN_HWPERF_SET_MMRS (14|SN_HWPERF_OP_MEM_COPYIN)
+#define SN_HWPERF_GET_MMRS (15|SN_HWPERF_OP_MEM_COPYOUT| \
+ SN_HWPERF_OP_MEM_COPYIN)
+/*
+ * Lock a shared object
+ * arg object id
+ * sz don't care
+ * p don't care
+ */
+#define SN_HWPERF_ACQUIRE 16
+
+/*
+ * Unlock a shared object
+ * arg object id
+ * sz don't care
+ * p don't care
+ */
+#define SN_HWPERF_RELEASE 17
+
+/*
+ * Break a lock on a shared object
+ * arg object id
+ * sz don't care
+ * p don't care
+ */
+#define SN_HWPERF_FORCE_RELEASE 18
+
+/*
+ * ioctl requests on "sn_hwperf" that do not call SAL
+ */
+
+/*
+ * get cpu info as an array of hwperf_object_info_t.
+ * id is logical CPU number, name is description, location
+ * is geoid (e.g. 001c04#1c). Special case if sz == 8,
+ * returns the required buffer size.
+ *
+ * arg don't care
+ * sz sizeof buffer pointed to by p
+ * p pointer to array of struct sn_hwperf_object_info
+ */
+#define SN_HWPERF_GET_CPU_INFO (100|SN_HWPERF_OP_MEM_COPYOUT)
+
+/*
+ * Given an object id, return it's node number (aka cnode).
+ * arg object id
+ * sz 8
+ * p pointer to u64 integer
+ */
+#define SN_HWPERF_GET_OBJ_NODE (101|SN_HWPERF_OP_MEM_COPYOUT)
+
+/*
+ * Given a node number (cnode), return it's nasid.
+ * arg ordinal node number (aka cnodeid)
+ * sz 8
+ * p pointer to u64 integer
+ */
+#define SN_HWPERF_GET_NODE_NASID (102|SN_HWPERF_OP_MEM_COPYOUT)
+
+/*
+ * Given a node id, determine the id of the nearest node with CPUs
+ * and the id of the nearest node that has memory. The argument
+ * node would normally be a "headless" node, e.g. an "IO node".
+ * Return 0 on success.
+ */
+extern int sn_hwperf_get_nearest_node(cnodeid_t node,
+ cnodeid_t *near_mem, cnodeid_t *near_cpu);
+
+/* return codes */
+#define SN_HWPERF_OP_OK 0
+#define SN_HWPERF_OP_NOMEM 1
+#define SN_HWPERF_OP_NO_PERM 2
+#define SN_HWPERF_OP_IO_ERROR 3
+#define SN_HWPERF_OP_BUSY 4
+#define SN_HWPERF_OP_RECONFIGURE 253
+#define SN_HWPERF_OP_INVAL 254
+
+int sn_topology_open(struct inode *inode, struct file *file);
+int sn_topology_release(struct inode *inode, struct file *file);
+#endif /* SN_HWPERF_H */