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-rw-r--r--drivers/staging/lustre/lnet/libcfs/libcfs_cpu.c1086
1 files changed, 0 insertions, 1086 deletions
diff --git a/drivers/staging/lustre/lnet/libcfs/libcfs_cpu.c b/drivers/staging/lustre/lnet/libcfs/libcfs_cpu.c
deleted file mode 100644
index 3d1cf457b286..000000000000
--- a/drivers/staging/lustre/lnet/libcfs/libcfs_cpu.c
+++ /dev/null
@@ -1,1086 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * 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).
- *
- * 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.
- *
- * Please see comments in libcfs/include/libcfs/libcfs_cpu.h for introduction
- *
- * Author: liang@whamcloud.com
- */
-
-#define DEBUG_SUBSYSTEM S_LNET
-
-#include <linux/cpu.h>
-#include <linux/sched.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/cache.h>
-
-#include <linux/libcfs/libcfs_cpu.h>
-#include <linux/libcfs/libcfs_string.h>
-#include <linux/libcfs/libcfs.h>
-
-/** Global CPU partition table */
-struct cfs_cpt_table *cfs_cpt_tab __read_mostly;
-EXPORT_SYMBOL(cfs_cpt_tab);
-
-/**
- * modparam for setting number of partitions
- *
- * 0 : estimate best value based on cores or NUMA nodes
- * 1 : disable multiple partitions
- * >1 : specify number of partitions
- */
-static int cpu_npartitions;
-module_param(cpu_npartitions, int, 0444);
-MODULE_PARM_DESC(cpu_npartitions, "# of CPU partitions");
-
-/**
- * modparam for setting CPU partitions patterns:
- *
- * i.e: "0[0,1,2,3] 1[4,5,6,7]", number before bracket is CPU partition ID,
- * number in bracket is processor ID (core or HT)
- *
- * i.e: "N 0[0,1] 1[2,3]" the first character 'N' means numbers in bracket
- * are NUMA node ID, number before bracket is CPU partition ID.
- *
- * i.e: "N", shortcut expression to create CPT from NUMA & CPU topology
- *
- * NB: If user specified cpu_pattern, cpu_npartitions will be ignored
- */
-static char *cpu_pattern = "N";
-module_param(cpu_pattern, charp, 0444);
-MODULE_PARM_DESC(cpu_pattern, "CPU partitions pattern");
-
-static struct cfs_cpt_data {
- /* serialize hotplug etc */
- spinlock_t cpt_lock;
- /* reserved for hotplug */
- unsigned long cpt_version;
- /* mutex to protect cpt_cpumask */
- struct mutex cpt_mutex;
- /* scratch buffer for set/unset_node */
- cpumask_var_t cpt_cpumask;
-} cpt_data;
-
-#define CFS_CPU_VERSION_MAGIC 0xbabecafe
-
-struct cfs_cpt_table *
-cfs_cpt_table_alloc(unsigned int ncpt)
-{
- struct cfs_cpt_table *cptab;
- int i;
-
- cptab = kzalloc(sizeof(*cptab), GFP_NOFS);
- if (!cptab)
- return NULL;
-
- cptab->ctb_nparts = ncpt;
-
- cptab->ctb_nodemask = kzalloc(sizeof(*cptab->ctb_nodemask),
- GFP_NOFS);
- if (!zalloc_cpumask_var(&cptab->ctb_cpumask, GFP_NOFS) ||
- !cptab->ctb_nodemask)
- goto failed;
-
- cptab->ctb_cpu2cpt = kvmalloc_array(num_possible_cpus(),
- sizeof(cptab->ctb_cpu2cpt[0]),
- GFP_KERNEL);
- if (!cptab->ctb_cpu2cpt)
- goto failed;
-
- memset(cptab->ctb_cpu2cpt, -1,
- num_possible_cpus() * sizeof(cptab->ctb_cpu2cpt[0]));
-
- cptab->ctb_parts = kvmalloc_array(ncpt, sizeof(cptab->ctb_parts[0]),
- GFP_KERNEL);
- if (!cptab->ctb_parts)
- goto failed;
-
- for (i = 0; i < ncpt; i++) {
- struct cfs_cpu_partition *part = &cptab->ctb_parts[i];
-
- part->cpt_nodemask = kzalloc(sizeof(*part->cpt_nodemask),
- GFP_NOFS);
- if (!zalloc_cpumask_var(&part->cpt_cpumask, GFP_NOFS) ||
- !part->cpt_nodemask)
- goto failed;
- }
-
- spin_lock(&cpt_data.cpt_lock);
- /* Reserved for hotplug */
- cptab->ctb_version = cpt_data.cpt_version;
- spin_unlock(&cpt_data.cpt_lock);
-
- return cptab;
-
- failed:
- cfs_cpt_table_free(cptab);
- return NULL;
-}
-EXPORT_SYMBOL(cfs_cpt_table_alloc);
-
-void
-cfs_cpt_table_free(struct cfs_cpt_table *cptab)
-{
- int i;
-
- kvfree(cptab->ctb_cpu2cpt);
-
- for (i = 0; cptab->ctb_parts && i < cptab->ctb_nparts; i++) {
- struct cfs_cpu_partition *part = &cptab->ctb_parts[i];
-
- kfree(part->cpt_nodemask);
- free_cpumask_var(part->cpt_cpumask);
- }
-
- kvfree(cptab->ctb_parts);
-
- kfree(cptab->ctb_nodemask);
- free_cpumask_var(cptab->ctb_cpumask);
-
- kfree(cptab);
-}
-EXPORT_SYMBOL(cfs_cpt_table_free);
-
-int
-cfs_cpt_table_print(struct cfs_cpt_table *cptab, char *buf, int len)
-{
- char *tmp = buf;
- int rc = 0;
- int i;
- int j;
-
- for (i = 0; i < cptab->ctb_nparts; i++) {
- if (len > 0) {
- rc = snprintf(tmp, len, "%d\t: ", i);
- len -= rc;
- }
-
- if (len <= 0) {
- rc = -EFBIG;
- goto out;
- }
-
- tmp += rc;
- for_each_cpu(j, cptab->ctb_parts[i].cpt_cpumask) {
- rc = snprintf(tmp, len, "%d ", j);
- len -= rc;
- if (len <= 0) {
- rc = -EFBIG;
- goto out;
- }
- tmp += rc;
- }
-
- *tmp = '\n';
- tmp++;
- len--;
- }
-
- out:
- if (rc < 0)
- return rc;
-
- return tmp - buf;
-}
-EXPORT_SYMBOL(cfs_cpt_table_print);
-
-static void
-cfs_node_to_cpumask(int node, cpumask_t *mask)
-{
- const cpumask_t *tmp = cpumask_of_node(node);
-
- if (tmp)
- cpumask_copy(mask, tmp);
- else
- cpumask_clear(mask);
-}
-
-int
-cfs_cpt_number(struct cfs_cpt_table *cptab)
-{
- return cptab->ctb_nparts;
-}
-EXPORT_SYMBOL(cfs_cpt_number);
-
-int
-cfs_cpt_weight(struct cfs_cpt_table *cptab, int cpt)
-{
- LASSERT(cpt == CFS_CPT_ANY || (cpt >= 0 && cpt < cptab->ctb_nparts));
-
- return cpt == CFS_CPT_ANY ?
- cpumask_weight(cptab->ctb_cpumask) :
- cpumask_weight(cptab->ctb_parts[cpt].cpt_cpumask);
-}
-EXPORT_SYMBOL(cfs_cpt_weight);
-
-int
-cfs_cpt_online(struct cfs_cpt_table *cptab, int cpt)
-{
- LASSERT(cpt == CFS_CPT_ANY || (cpt >= 0 && cpt < cptab->ctb_nparts));
-
- return cpt == CFS_CPT_ANY ?
- cpumask_any_and(cptab->ctb_cpumask,
- cpu_online_mask) < nr_cpu_ids :
- cpumask_any_and(cptab->ctb_parts[cpt].cpt_cpumask,
- cpu_online_mask) < nr_cpu_ids;
-}
-EXPORT_SYMBOL(cfs_cpt_online);
-
-cpumask_var_t *
-cfs_cpt_cpumask(struct cfs_cpt_table *cptab, int cpt)
-{
- LASSERT(cpt == CFS_CPT_ANY || (cpt >= 0 && cpt < cptab->ctb_nparts));
-
- return cpt == CFS_CPT_ANY ?
- &cptab->ctb_cpumask : &cptab->ctb_parts[cpt].cpt_cpumask;
-}
-EXPORT_SYMBOL(cfs_cpt_cpumask);
-
-nodemask_t *
-cfs_cpt_nodemask(struct cfs_cpt_table *cptab, int cpt)
-{
- LASSERT(cpt == CFS_CPT_ANY || (cpt >= 0 && cpt < cptab->ctb_nparts));
-
- return cpt == CFS_CPT_ANY ?
- cptab->ctb_nodemask : cptab->ctb_parts[cpt].cpt_nodemask;
-}
-EXPORT_SYMBOL(cfs_cpt_nodemask);
-
-int
-cfs_cpt_set_cpu(struct cfs_cpt_table *cptab, int cpt, int cpu)
-{
- int node;
-
- LASSERT(cpt >= 0 && cpt < cptab->ctb_nparts);
-
- if (cpu < 0 || cpu >= nr_cpu_ids || !cpu_online(cpu)) {
- CDEBUG(D_INFO, "CPU %d is invalid or it's offline\n", cpu);
- return 0;
- }
-
- if (cptab->ctb_cpu2cpt[cpu] != -1) {
- CDEBUG(D_INFO, "CPU %d is already in partition %d\n",
- cpu, cptab->ctb_cpu2cpt[cpu]);
- return 0;
- }
-
- cptab->ctb_cpu2cpt[cpu] = cpt;
-
- LASSERT(!cpumask_test_cpu(cpu, cptab->ctb_cpumask));
- LASSERT(!cpumask_test_cpu(cpu, cptab->ctb_parts[cpt].cpt_cpumask));
-
- cpumask_set_cpu(cpu, cptab->ctb_cpumask);
- cpumask_set_cpu(cpu, cptab->ctb_parts[cpt].cpt_cpumask);
-
- node = cpu_to_node(cpu);
-
- /* first CPU of @node in this CPT table */
- if (!node_isset(node, *cptab->ctb_nodemask))
- node_set(node, *cptab->ctb_nodemask);
-
- /* first CPU of @node in this partition */
- if (!node_isset(node, *cptab->ctb_parts[cpt].cpt_nodemask))
- node_set(node, *cptab->ctb_parts[cpt].cpt_nodemask);
-
- return 1;
-}
-EXPORT_SYMBOL(cfs_cpt_set_cpu);
-
-void
-cfs_cpt_unset_cpu(struct cfs_cpt_table *cptab, int cpt, int cpu)
-{
- int node;
- int i;
-
- LASSERT(cpt == CFS_CPT_ANY || (cpt >= 0 && cpt < cptab->ctb_nparts));
-
- if (cpu < 0 || cpu >= nr_cpu_ids) {
- CDEBUG(D_INFO, "Invalid CPU id %d\n", cpu);
- return;
- }
-
- if (cpt == CFS_CPT_ANY) {
- /* caller doesn't know the partition ID */
- cpt = cptab->ctb_cpu2cpt[cpu];
- if (cpt < 0) { /* not set in this CPT-table */
- CDEBUG(D_INFO, "Try to unset cpu %d which is not in CPT-table %p\n",
- cpt, cptab);
- return;
- }
-
- } else if (cpt != cptab->ctb_cpu2cpt[cpu]) {
- CDEBUG(D_INFO,
- "CPU %d is not in cpu-partition %d\n", cpu, cpt);
- return;
- }
-
- LASSERT(cpumask_test_cpu(cpu, cptab->ctb_parts[cpt].cpt_cpumask));
- LASSERT(cpumask_test_cpu(cpu, cptab->ctb_cpumask));
-
- cpumask_clear_cpu(cpu, cptab->ctb_parts[cpt].cpt_cpumask);
- cpumask_clear_cpu(cpu, cptab->ctb_cpumask);
- cptab->ctb_cpu2cpt[cpu] = -1;
-
- node = cpu_to_node(cpu);
-
- LASSERT(node_isset(node, *cptab->ctb_parts[cpt].cpt_nodemask));
- LASSERT(node_isset(node, *cptab->ctb_nodemask));
-
- for_each_cpu(i, cptab->ctb_parts[cpt].cpt_cpumask) {
- /* this CPT has other CPU belonging to this node? */
- if (cpu_to_node(i) == node)
- break;
- }
-
- if (i >= nr_cpu_ids)
- node_clear(node, *cptab->ctb_parts[cpt].cpt_nodemask);
-
- for_each_cpu(i, cptab->ctb_cpumask) {
- /* this CPT-table has other CPU belonging to this node? */
- if (cpu_to_node(i) == node)
- break;
- }
-
- if (i >= nr_cpu_ids)
- node_clear(node, *cptab->ctb_nodemask);
-}
-EXPORT_SYMBOL(cfs_cpt_unset_cpu);
-
-int
-cfs_cpt_set_cpumask(struct cfs_cpt_table *cptab, int cpt, cpumask_t *mask)
-{
- int i;
-
- if (!cpumask_weight(mask) ||
- cpumask_any_and(mask, cpu_online_mask) >= nr_cpu_ids) {
- CDEBUG(D_INFO, "No online CPU is found in the CPU mask for CPU partition %d\n",
- cpt);
- return 0;
- }
-
- for_each_cpu(i, mask) {
- if (!cfs_cpt_set_cpu(cptab, cpt, i))
- return 0;
- }
-
- return 1;
-}
-EXPORT_SYMBOL(cfs_cpt_set_cpumask);
-
-void
-cfs_cpt_unset_cpumask(struct cfs_cpt_table *cptab, int cpt, cpumask_t *mask)
-{
- int i;
-
- for_each_cpu(i, mask)
- cfs_cpt_unset_cpu(cptab, cpt, i);
-}
-EXPORT_SYMBOL(cfs_cpt_unset_cpumask);
-
-int
-cfs_cpt_set_node(struct cfs_cpt_table *cptab, int cpt, int node)
-{
- int rc;
-
- if (node < 0 || node >= MAX_NUMNODES) {
- CDEBUG(D_INFO,
- "Invalid NUMA id %d for CPU partition %d\n", node, cpt);
- return 0;
- }
-
- mutex_lock(&cpt_data.cpt_mutex);
-
- cfs_node_to_cpumask(node, cpt_data.cpt_cpumask);
-
- rc = cfs_cpt_set_cpumask(cptab, cpt, cpt_data.cpt_cpumask);
-
- mutex_unlock(&cpt_data.cpt_mutex);
-
- return rc;
-}
-EXPORT_SYMBOL(cfs_cpt_set_node);
-
-void
-cfs_cpt_unset_node(struct cfs_cpt_table *cptab, int cpt, int node)
-{
- if (node < 0 || node >= MAX_NUMNODES) {
- CDEBUG(D_INFO,
- "Invalid NUMA id %d for CPU partition %d\n", node, cpt);
- return;
- }
-
- mutex_lock(&cpt_data.cpt_mutex);
-
- cfs_node_to_cpumask(node, cpt_data.cpt_cpumask);
-
- cfs_cpt_unset_cpumask(cptab, cpt, cpt_data.cpt_cpumask);
-
- mutex_unlock(&cpt_data.cpt_mutex);
-}
-EXPORT_SYMBOL(cfs_cpt_unset_node);
-
-int
-cfs_cpt_set_nodemask(struct cfs_cpt_table *cptab, int cpt, nodemask_t *mask)
-{
- int i;
-
- for_each_node_mask(i, *mask) {
- if (!cfs_cpt_set_node(cptab, cpt, i))
- return 0;
- }
-
- return 1;
-}
-EXPORT_SYMBOL(cfs_cpt_set_nodemask);
-
-void
-cfs_cpt_unset_nodemask(struct cfs_cpt_table *cptab, int cpt, nodemask_t *mask)
-{
- int i;
-
- for_each_node_mask(i, *mask)
- cfs_cpt_unset_node(cptab, cpt, i);
-}
-EXPORT_SYMBOL(cfs_cpt_unset_nodemask);
-
-void
-cfs_cpt_clear(struct cfs_cpt_table *cptab, int cpt)
-{
- int last;
- int i;
-
- if (cpt == CFS_CPT_ANY) {
- last = cptab->ctb_nparts - 1;
- cpt = 0;
- } else {
- last = cpt;
- }
-
- for (; cpt <= last; cpt++) {
- for_each_cpu(i, cptab->ctb_parts[cpt].cpt_cpumask)
- cfs_cpt_unset_cpu(cptab, cpt, i);
- }
-}
-EXPORT_SYMBOL(cfs_cpt_clear);
-
-int
-cfs_cpt_spread_node(struct cfs_cpt_table *cptab, int cpt)
-{
- nodemask_t *mask;
- int weight;
- int rotor;
- int node;
-
- /* convert CPU partition ID to HW node id */
-
- if (cpt < 0 || cpt >= cptab->ctb_nparts) {
- mask = cptab->ctb_nodemask;
- rotor = cptab->ctb_spread_rotor++;
- } else {
- mask = cptab->ctb_parts[cpt].cpt_nodemask;
- rotor = cptab->ctb_parts[cpt].cpt_spread_rotor++;
- }
-
- weight = nodes_weight(*mask);
- LASSERT(weight > 0);
-
- rotor %= weight;
-
- for_each_node_mask(node, *mask) {
- if (!rotor--)
- return node;
- }
-
- LBUG();
- return 0;
-}
-EXPORT_SYMBOL(cfs_cpt_spread_node);
-
-int
-cfs_cpt_current(struct cfs_cpt_table *cptab, int remap)
-{
- int cpu;
- int cpt;
-
- preempt_disable();
- cpu = smp_processor_id();
- cpt = cptab->ctb_cpu2cpt[cpu];
-
- if (cpt < 0 && remap) {
- /* don't return negative value for safety of upper layer,
- * instead we shadow the unknown cpu to a valid partition ID
- */
- cpt = cpu % cptab->ctb_nparts;
- }
- preempt_enable();
- return cpt;
-}
-EXPORT_SYMBOL(cfs_cpt_current);
-
-int
-cfs_cpt_of_cpu(struct cfs_cpt_table *cptab, int cpu)
-{
- LASSERT(cpu >= 0 && cpu < nr_cpu_ids);
-
- return cptab->ctb_cpu2cpt[cpu];
-}
-EXPORT_SYMBOL(cfs_cpt_of_cpu);
-
-int
-cfs_cpt_bind(struct cfs_cpt_table *cptab, int cpt)
-{
- cpumask_var_t *cpumask;
- nodemask_t *nodemask;
- int rc;
- int i;
-
- LASSERT(cpt == CFS_CPT_ANY || (cpt >= 0 && cpt < cptab->ctb_nparts));
-
- if (cpt == CFS_CPT_ANY) {
- cpumask = &cptab->ctb_cpumask;
- nodemask = cptab->ctb_nodemask;
- } else {
- cpumask = &cptab->ctb_parts[cpt].cpt_cpumask;
- nodemask = cptab->ctb_parts[cpt].cpt_nodemask;
- }
-
- if (cpumask_any_and(*cpumask, cpu_online_mask) >= nr_cpu_ids) {
- CERROR("No online CPU found in CPU partition %d, did someone do CPU hotplug on system? You might need to reload Lustre modules to keep system working well.\n",
- cpt);
- return -EINVAL;
- }
-
- for_each_online_cpu(i) {
- if (cpumask_test_cpu(i, *cpumask))
- continue;
-
- rc = set_cpus_allowed_ptr(current, *cpumask);
- set_mems_allowed(*nodemask);
- if (!rc)
- schedule(); /* switch to allowed CPU */
-
- return rc;
- }
-
- /* don't need to set affinity because all online CPUs are covered */
- return 0;
-}
-EXPORT_SYMBOL(cfs_cpt_bind);
-
-/**
- * Choose max to \a number CPUs from \a node and set them in \a cpt.
- * We always prefer to choose CPU in the same core/socket.
- */
-static int
-cfs_cpt_choose_ncpus(struct cfs_cpt_table *cptab, int cpt,
- cpumask_t *node, int number)
-{
- cpumask_var_t socket;
- cpumask_var_t core;
- int rc = 0;
- int cpu;
-
- LASSERT(number > 0);
-
- if (number >= cpumask_weight(node)) {
- while (!cpumask_empty(node)) {
- cpu = cpumask_first(node);
-
- rc = cfs_cpt_set_cpu(cptab, cpt, cpu);
- if (!rc)
- return -EINVAL;
- cpumask_clear_cpu(cpu, node);
- }
- return 0;
- }
-
- /*
- * Allocate scratch buffers
- * As we cannot initialize a cpumask_var_t, we need
- * to alloc both before we can risk trying to free either
- */
- if (!zalloc_cpumask_var(&socket, GFP_NOFS))
- rc = -ENOMEM;
- if (!zalloc_cpumask_var(&core, GFP_NOFS))
- rc = -ENOMEM;
- if (rc)
- goto out;
-
- while (!cpumask_empty(node)) {
- cpu = cpumask_first(node);
-
- /* get cpumask for cores in the same socket */
- cpumask_copy(socket, topology_core_cpumask(cpu));
- cpumask_and(socket, socket, node);
-
- LASSERT(!cpumask_empty(socket));
-
- while (!cpumask_empty(socket)) {
- int i;
-
- /* get cpumask for hts in the same core */
- cpumask_copy(core, topology_sibling_cpumask(cpu));
- cpumask_and(core, core, node);
-
- LASSERT(!cpumask_empty(core));
-
- for_each_cpu(i, core) {
- cpumask_clear_cpu(i, socket);
- cpumask_clear_cpu(i, node);
-
- rc = cfs_cpt_set_cpu(cptab, cpt, i);
- if (!rc) {
- rc = -EINVAL;
- goto out;
- }
-
- if (!--number)
- goto out;
- }
- cpu = cpumask_first(socket);
- }
- }
-
-out:
- free_cpumask_var(socket);
- free_cpumask_var(core);
- return rc;
-}
-
-#define CPT_WEIGHT_MIN 4u
-
-static unsigned int
-cfs_cpt_num_estimate(void)
-{
- unsigned int nnode = num_online_nodes();
- unsigned int ncpu = num_online_cpus();
- unsigned int ncpt;
-
- if (ncpu <= CPT_WEIGHT_MIN) {
- ncpt = 1;
- goto out;
- }
-
- /* generate reasonable number of CPU partitions based on total number
- * of CPUs, Preferred N should be power2 and match this condition:
- * 2 * (N - 1)^2 < NCPUS <= 2 * N^2
- */
- for (ncpt = 2; ncpu > 2 * ncpt * ncpt; ncpt <<= 1)
- ;
-
- if (ncpt <= nnode) { /* fat numa system */
- while (nnode > ncpt)
- nnode >>= 1;
-
- } else { /* ncpt > nnode */
- while ((nnode << 1) <= ncpt)
- nnode <<= 1;
- }
-
- ncpt = nnode;
-
-out:
-#if (BITS_PER_LONG == 32)
- /* config many CPU partitions on 32-bit system could consume
- * too much memory
- */
- ncpt = min(2U, ncpt);
-#endif
- while (ncpu % ncpt)
- ncpt--; /* worst case is 1 */
-
- return ncpt;
-}
-
-static struct cfs_cpt_table *
-cfs_cpt_table_create(int ncpt)
-{
- struct cfs_cpt_table *cptab = NULL;
- cpumask_var_t mask;
- int cpt = 0;
- int num;
- int rc;
- int i;
-
- rc = cfs_cpt_num_estimate();
- if (ncpt <= 0)
- ncpt = rc;
-
- if (ncpt > num_online_cpus() || ncpt > 4 * rc) {
- CWARN("CPU partition number %d is larger than suggested value (%d), your system may have performance issue or run out of memory while under pressure\n",
- ncpt, rc);
- }
-
- if (num_online_cpus() % ncpt) {
- CERROR("CPU number %d is not multiple of cpu_npartition %d, please try different cpu_npartitions value or set pattern string by cpu_pattern=STRING\n",
- (int)num_online_cpus(), ncpt);
- goto failed;
- }
-
- cptab = cfs_cpt_table_alloc(ncpt);
- if (!cptab) {
- CERROR("Failed to allocate CPU map(%d)\n", ncpt);
- goto failed;
- }
-
- num = num_online_cpus() / ncpt;
- if (!num) {
- CERROR("CPU changed while setting CPU partition\n");
- goto failed;
- }
-
- if (!zalloc_cpumask_var(&mask, GFP_NOFS)) {
- CERROR("Failed to allocate scratch cpumask\n");
- goto failed;
- }
-
- for_each_online_node(i) {
- cfs_node_to_cpumask(i, mask);
-
- while (!cpumask_empty(mask)) {
- struct cfs_cpu_partition *part;
- int n;
-
- /*
- * Each emulated NUMA node has all allowed CPUs in
- * the mask.
- * End loop when all partitions have assigned CPUs.
- */
- if (cpt == ncpt)
- break;
-
- part = &cptab->ctb_parts[cpt];
-
- n = num - cpumask_weight(part->cpt_cpumask);
- LASSERT(n > 0);
-
- rc = cfs_cpt_choose_ncpus(cptab, cpt, mask, n);
- if (rc < 0)
- goto failed_mask;
-
- LASSERT(num >= cpumask_weight(part->cpt_cpumask));
- if (num == cpumask_weight(part->cpt_cpumask))
- cpt++;
- }
- }
-
- if (cpt != ncpt ||
- num != cpumask_weight(cptab->ctb_parts[ncpt - 1].cpt_cpumask)) {
- CERROR("Expect %d(%d) CPU partitions but got %d(%d), CPU hotplug/unplug while setting?\n",
- cptab->ctb_nparts, num, cpt,
- cpumask_weight(cptab->ctb_parts[ncpt - 1].cpt_cpumask));
- goto failed_mask;
- }
-
- free_cpumask_var(mask);
-
- return cptab;
-
- failed_mask:
- free_cpumask_var(mask);
- failed:
- CERROR("Failed to setup CPU-partition-table with %d CPU-partitions, online HW nodes: %d, HW cpus: %d.\n",
- ncpt, num_online_nodes(), num_online_cpus());
-
- if (cptab)
- cfs_cpt_table_free(cptab);
-
- return NULL;
-}
-
-static struct cfs_cpt_table *
-cfs_cpt_table_create_pattern(char *pattern)
-{
- struct cfs_cpt_table *cptab;
- char *str;
- int node = 0;
- int high;
- int ncpt = 0;
- int cpt;
- int rc;
- int c;
- int i;
-
- str = strim(pattern);
- if (*str == 'n' || *str == 'N') {
- pattern = str + 1;
- if (*pattern != '\0') {
- node = 1;
- } else { /* shortcut to create CPT from NUMA & CPU topology */
- node = -1;
- ncpt = num_online_nodes();
- }
- }
-
- if (!ncpt) { /* scanning bracket which is mark of partition */
- for (str = pattern;; str++, ncpt++) {
- str = strchr(str, '[');
- if (!str)
- break;
- }
- }
-
- if (!ncpt ||
- (node && ncpt > num_online_nodes()) ||
- (!node && ncpt > num_online_cpus())) {
- CERROR("Invalid pattern %s, or too many partitions %d\n",
- pattern, ncpt);
- return NULL;
- }
-
- cptab = cfs_cpt_table_alloc(ncpt);
- if (!cptab) {
- CERROR("Failed to allocate cpu partition table\n");
- return NULL;
- }
-
- if (node < 0) { /* shortcut to create CPT from NUMA & CPU topology */
- cpt = 0;
-
- for_each_online_node(i) {
- if (cpt >= ncpt) {
- CERROR("CPU changed while setting CPU partition table, %d/%d\n",
- cpt, ncpt);
- goto failed;
- }
-
- rc = cfs_cpt_set_node(cptab, cpt++, i);
- if (!rc)
- goto failed;
- }
- return cptab;
- }
-
- high = node ? MAX_NUMNODES - 1 : nr_cpu_ids - 1;
-
- for (str = strim(pattern), c = 0;; c++) {
- struct cfs_range_expr *range;
- struct cfs_expr_list *el;
- char *bracket = strchr(str, '[');
- int n;
-
- if (!bracket) {
- if (*str) {
- CERROR("Invalid pattern %s\n", str);
- goto failed;
- }
- if (c != ncpt) {
- CERROR("expect %d partitions but found %d\n",
- ncpt, c);
- goto failed;
- }
- break;
- }
-
- if (sscanf(str, "%d%n", &cpt, &n) < 1) {
- CERROR("Invalid cpu pattern %s\n", str);
- goto failed;
- }
-
- if (cpt < 0 || cpt >= ncpt) {
- CERROR("Invalid partition id %d, total partitions %d\n",
- cpt, ncpt);
- goto failed;
- }
-
- if (cfs_cpt_weight(cptab, cpt)) {
- CERROR("Partition %d has already been set.\n", cpt);
- goto failed;
- }
-
- str = strim(str + n);
- if (str != bracket) {
- CERROR("Invalid pattern %s\n", str);
- goto failed;
- }
-
- bracket = strchr(str, ']');
- if (!bracket) {
- CERROR("missing right bracket for cpt %d, %s\n",
- cpt, str);
- goto failed;
- }
-
- if (cfs_expr_list_parse(str, (bracket - str) + 1,
- 0, high, &el)) {
- CERROR("Can't parse number range: %s\n", str);
- goto failed;
- }
-
- list_for_each_entry(range, &el->el_exprs, re_link) {
- for (i = range->re_lo; i <= range->re_hi; i++) {
- if ((i - range->re_lo) % range->re_stride)
- continue;
-
- rc = node ? cfs_cpt_set_node(cptab, cpt, i) :
- cfs_cpt_set_cpu(cptab, cpt, i);
- if (!rc) {
- cfs_expr_list_free(el);
- goto failed;
- }
- }
- }
-
- cfs_expr_list_free(el);
-
- if (!cfs_cpt_online(cptab, cpt)) {
- CERROR("No online CPU is found on partition %d\n", cpt);
- goto failed;
- }
-
- str = strim(bracket + 1);
- }
-
- return cptab;
-
- failed:
- cfs_cpt_table_free(cptab);
- return NULL;
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-static enum cpuhp_state lustre_cpu_online;
-
-static void cfs_cpu_incr_cpt_version(void)
-{
- spin_lock(&cpt_data.cpt_lock);
- cpt_data.cpt_version++;
- spin_unlock(&cpt_data.cpt_lock);
-}
-
-static int cfs_cpu_online(unsigned int cpu)
-{
- cfs_cpu_incr_cpt_version();
- return 0;
-}
-
-static int cfs_cpu_dead(unsigned int cpu)
-{
- bool warn;
-
- cfs_cpu_incr_cpt_version();
-
- mutex_lock(&cpt_data.cpt_mutex);
- /* if all HTs in a core are offline, it may break affinity */
- cpumask_copy(cpt_data.cpt_cpumask, topology_sibling_cpumask(cpu));
- warn = cpumask_any_and(cpt_data.cpt_cpumask,
- cpu_online_mask) >= nr_cpu_ids;
- mutex_unlock(&cpt_data.cpt_mutex);
- CDEBUG(warn ? D_WARNING : D_INFO,
- "Lustre: can't support CPU plug-out well now, performance and stability could be impacted [CPU %u]\n",
- cpu);
- return 0;
-}
-#endif
-
-void
-cfs_cpu_fini(void)
-{
- if (cfs_cpt_tab)
- cfs_cpt_table_free(cfs_cpt_tab);
-
-#ifdef CONFIG_HOTPLUG_CPU
- if (lustre_cpu_online > 0)
- cpuhp_remove_state_nocalls(lustre_cpu_online);
- cpuhp_remove_state_nocalls(CPUHP_LUSTRE_CFS_DEAD);
-#endif
- free_cpumask_var(cpt_data.cpt_cpumask);
-}
-
-int
-cfs_cpu_init(void)
-{
- int ret = 0;
-
- LASSERT(!cfs_cpt_tab);
-
- memset(&cpt_data, 0, sizeof(cpt_data));
-
- if (!zalloc_cpumask_var(&cpt_data.cpt_cpumask, GFP_NOFS)) {
- CERROR("Failed to allocate scratch buffer\n");
- return -1;
- }
-
- spin_lock_init(&cpt_data.cpt_lock);
- mutex_init(&cpt_data.cpt_mutex);
-
-#ifdef CONFIG_HOTPLUG_CPU
- ret = cpuhp_setup_state_nocalls(CPUHP_LUSTRE_CFS_DEAD,
- "staging/lustre/cfe:dead", NULL,
- cfs_cpu_dead);
- if (ret < 0)
- goto failed;
- ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
- "staging/lustre/cfe:online",
- cfs_cpu_online, NULL);
- if (ret < 0)
- goto failed;
- lustre_cpu_online = ret;
-#endif
- ret = -EINVAL;
-
- if (*cpu_pattern) {
- char *cpu_pattern_dup = kstrdup(cpu_pattern, GFP_KERNEL);
-
- if (!cpu_pattern_dup) {
- CERROR("Failed to duplicate cpu_pattern\n");
- goto failed;
- }
-
- cfs_cpt_tab = cfs_cpt_table_create_pattern(cpu_pattern_dup);
- kfree(cpu_pattern_dup);
- if (!cfs_cpt_tab) {
- CERROR("Failed to create cptab from pattern %s\n",
- cpu_pattern);
- goto failed;
- }
-
- } else {
- cfs_cpt_tab = cfs_cpt_table_create(cpu_npartitions);
- if (!cfs_cpt_tab) {
- CERROR("Failed to create ptable with npartitions %d\n",
- cpu_npartitions);
- goto failed;
- }
- }
-
- spin_lock(&cpt_data.cpt_lock);
- if (cfs_cpt_tab->ctb_version != cpt_data.cpt_version) {
- spin_unlock(&cpt_data.cpt_lock);
- CERROR("CPU hotplug/unplug during setup\n");
- goto failed;
- }
- spin_unlock(&cpt_data.cpt_lock);
-
- LCONSOLE(0, "HW nodes: %d, HW CPU cores: %d, npartitions: %d\n",
- num_online_nodes(), num_online_cpus(),
- cfs_cpt_number(cfs_cpt_tab));
- return 0;
-
- failed:
- cfs_cpu_fini();
- return ret;
-}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.