--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * libcfs/include/libcfs/libcfs_cpu.h
+ *
+ * CPU partition
+ * . CPU partition is virtual processing unit
+ *
+ * . CPU partition can present 1-N cores, or 1-N NUMA nodes,
+ * in other words, CPU partition is a processors pool.
+ *
+ * CPU Partition Table (CPT)
+ * . a set of CPU partitions
+ *
+ * . There are two modes for CPT: CFS_CPU_MODE_NUMA and CFS_CPU_MODE_SMP
+ *
+ * . User can specify total number of CPU partitions while creating a
+ * CPT, ID of CPU partition is always start from 0.
+ *
+ * Example: if there are 8 cores on the system, while creating a CPT
+ * with cpu_npartitions=4:
+ * core[0, 1] = partition[0], core[2, 3] = partition[1]
+ * core[4, 5] = partition[2], core[6, 7] = partition[3]
+ *
+ * cpu_npartitions=1:
+ * core[0, 1, ... 7] = partition[0]
+ *
+ * . User can also specify CPU partitions by string pattern
+ *
+ * Examples: cpu_partitions="0[0,1], 1[2,3]"
+ * cpu_partitions="N 0[0-3], 1[4-8]"
+ *
+ * The first character "N" means following numbers are numa ID
+ *
+ * . NUMA allocators, CPU affinity threads are built over CPU partitions,
+ * instead of HW CPUs or HW nodes.
+ *
+ * . By default, Lustre modules should refer to the global cfs_cpt_table,
+ * instead of accessing HW CPUs directly, so concurrency of Lustre can be
+ * configured by cpu_npartitions of the global cfs_cpt_table
+ *
+ * . If cpu_npartitions=1(all CPUs in one pool), lustre should work the
+ * same way as 2.2 or earlier versions
+ *
+ * Author: liang@whamcloud.com
+ */
+
+#ifndef __LIBCFS_CPU_H__
+#define __LIBCFS_CPU_H__
+
+/* any CPU partition */
+#define CFS_CPT_ANY (-1)
+
+#ifdef CONFIG_SMP
+/**
+ * return cpumask of CPU partition \a cpt
+ */
+cpumask_t *cfs_cpt_cpumask(struct cfs_cpt_table *cptab, int cpt);
+/**
+ * print string information of cpt-table
+ */
+int cfs_cpt_table_print(struct cfs_cpt_table *cptab, char *buf, int len);
+#else /* !CONFIG_SMP */
+struct cfs_cpt_table {
+ /* # of CPU partitions */
+ int ctb_nparts;
+ /* cpu mask */
+ cpumask_t ctb_mask;
+ /* node mask */
+ nodemask_t ctb_nodemask;
+ /* version */
+ __u64 ctb_version;
+};
+
+static inline cpumask_t *
+cfs_cpt_cpumask(struct cfs_cpt_table *cptab, int cpt)
+{
+ return NULL;
+}
+
+static inline int
+cfs_cpt_table_print(struct cfs_cpt_table *cptab, char *buf, int len)
+{
+ return 0;
+}
+#endif /* CONFIG_SMP */
+
+extern struct cfs_cpt_table *cfs_cpt_table;
+
+/**
+ * destroy a CPU partition table
+ */
+void cfs_cpt_table_free(struct cfs_cpt_table *cptab);
+/**
+ * create a cfs_cpt_table with \a ncpt number of partitions
+ */
+struct cfs_cpt_table *cfs_cpt_table_alloc(unsigned int ncpt);
+/**
+ * return total number of CPU partitions in \a cptab
+ */
+int
+cfs_cpt_number(struct cfs_cpt_table *cptab);
+/**
+ * return number of HW cores or hyper-threadings in a CPU partition \a cpt
+ */
+int cfs_cpt_weight(struct cfs_cpt_table *cptab, int cpt);
+/**
+ * is there any online CPU in CPU partition \a cpt
+ */
+int cfs_cpt_online(struct cfs_cpt_table *cptab, int cpt);
+/**
+ * return nodemask of CPU partition \a cpt
+ */
+nodemask_t *cfs_cpt_nodemask(struct cfs_cpt_table *cptab, int cpt);
+/**
+ * shadow current HW processor ID to CPU-partition ID of \a cptab
+ */
+int cfs_cpt_current(struct cfs_cpt_table *cptab, int remap);
+/**
+ * shadow HW processor ID \a CPU to CPU-partition ID by \a cptab
+ */
+int cfs_cpt_of_cpu(struct cfs_cpt_table *cptab, int cpu);
+/**
+ * bind current thread on a CPU-partition \a cpt of \a cptab
+ */
+int cfs_cpt_bind(struct cfs_cpt_table *cptab, int cpt);
+/**
+ * add \a cpu to CPU partition @cpt of \a cptab, return 1 for success,
+ * otherwise 0 is returned
+ */
+int cfs_cpt_set_cpu(struct cfs_cpt_table *cptab, int cpt, int cpu);
+/**
+ * remove \a cpu from CPU partition \a cpt of \a cptab
+ */
+void cfs_cpt_unset_cpu(struct cfs_cpt_table *cptab, int cpt, int cpu);
+/**
+ * add all cpus in \a mask to CPU partition \a cpt
+ * return 1 if successfully set all CPUs, otherwise return 0
+ */
+int cfs_cpt_set_cpumask(struct cfs_cpt_table *cptab,
+ int cpt, cpumask_t *mask);
+/**
+ * remove all cpus in \a mask from CPU partition \a cpt
+ */
+void cfs_cpt_unset_cpumask(struct cfs_cpt_table *cptab,
+ int cpt, cpumask_t *mask);
+/**
+ * add all cpus in NUMA node \a node to CPU partition \a cpt
+ * return 1 if successfully set all CPUs, otherwise return 0
+ */
+int cfs_cpt_set_node(struct cfs_cpt_table *cptab, int cpt, int node);
+/**
+ * remove all cpus in NUMA node \a node from CPU partition \a cpt
+ */
+void cfs_cpt_unset_node(struct cfs_cpt_table *cptab, int cpt, int node);
+
+/**
+ * add all cpus in node mask \a mask to CPU partition \a cpt
+ * return 1 if successfully set all CPUs, otherwise return 0
+ */
+int cfs_cpt_set_nodemask(struct cfs_cpt_table *cptab,
+ int cpt, nodemask_t *mask);
+/**
+ * remove all cpus in node mask \a mask from CPU partition \a cpt
+ */
+void cfs_cpt_unset_nodemask(struct cfs_cpt_table *cptab,
+ int cpt, nodemask_t *mask);
+/**
+ * unset all cpus for CPU partition \a cpt
+ */
+void cfs_cpt_clear(struct cfs_cpt_table *cptab, int cpt);
+/**
+ * convert partition id \a cpt to numa node id, if there are more than one
+ * nodes in this partition, it might return a different node id each time.
+ */
+int cfs_cpt_spread_node(struct cfs_cpt_table *cptab, int cpt);
+
+/**
+ * return number of HTs in the same core of \a cpu
+ */
+int cfs_cpu_ht_nsiblings(int cpu);
+
+/**
+ * iterate over all CPU partitions in \a cptab
+ */
+#define cfs_cpt_for_each(i, cptab) \
+ for (i = 0; i < cfs_cpt_number(cptab); i++)
+
+int cfs_cpu_init(void);
+void cfs_cpu_fini(void);
+
+#endif /* __LIBCFS_CPU_H__ */
Code Review / kvmfornfv.git / blobdiff