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658 lines
20 KiB
658 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// Torture test for smp_call_function() and friends. |
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// |
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// Copyright (C) Facebook, 2020. |
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// |
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// Author: Paul E. McKenney <[email protected]> |
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#define pr_fmt(fmt) fmt |
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#include <linux/atomic.h> |
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#include <linux/bitops.h> |
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#include <linux/completion.h> |
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#include <linux/cpu.h> |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/kthread.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/notifier.h> |
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#include <linux/percpu.h> |
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#include <linux/rcupdate.h> |
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#include <linux/rcupdate_trace.h> |
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#include <linux/reboot.h> |
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#include <linux/sched.h> |
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#include <linux/spinlock.h> |
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#include <linux/smp.h> |
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#include <linux/stat.h> |
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#include <linux/srcu.h> |
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#include <linux/slab.h> |
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#include <linux/torture.h> |
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#include <linux/types.h> |
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#define SCFTORT_STRING "scftorture" |
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#define SCFTORT_FLAG SCFTORT_STRING ": " |
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#define SCFTORTOUT(s, x...) \ |
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pr_alert(SCFTORT_FLAG s, ## x) |
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#define VERBOSE_SCFTORTOUT(s, x...) \ |
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do { if (verbose) pr_alert(SCFTORT_FLAG s, ## x); } while (0) |
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#define VERBOSE_SCFTORTOUT_ERRSTRING(s, x...) \ |
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do { if (verbose) pr_alert(SCFTORT_FLAG "!!! " s, ## x); } while (0) |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Paul E. McKenney <[email protected]>"); |
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// Wait until there are multiple CPUs before starting test. |
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torture_param(int, holdoff, IS_BUILTIN(CONFIG_SCF_TORTURE_TEST) ? 10 : 0, |
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"Holdoff time before test start (s)"); |
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torture_param(int, longwait, 0, "Include ridiculously long waits? (seconds)"); |
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torture_param(int, nthreads, -1, "# threads, defaults to -1 for all CPUs."); |
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torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); |
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torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (s), 0=disable"); |
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torture_param(int, shutdown_secs, 0, "Shutdown time (ms), <= zero to disable."); |
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torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s."); |
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torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable"); |
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torture_param(bool, use_cpus_read_lock, 0, "Use cpus_read_lock() to exclude CPU hotplug."); |
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torture_param(int, verbose, 0, "Enable verbose debugging printk()s"); |
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torture_param(int, weight_resched, -1, "Testing weight for resched_cpu() operations."); |
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torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations."); |
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torture_param(int, weight_single_rpc, -1, "Testing weight for single-CPU RPC operations."); |
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torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations."); |
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torture_param(int, weight_many, -1, "Testing weight for multi-CPU no-wait operations."); |
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torture_param(int, weight_many_wait, -1, "Testing weight for multi-CPU operations."); |
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torture_param(int, weight_all, -1, "Testing weight for all-CPU no-wait operations."); |
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torture_param(int, weight_all_wait, -1, "Testing weight for all-CPU operations."); |
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char *torture_type = ""; |
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#ifdef MODULE |
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# define SCFTORT_SHUTDOWN 0 |
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#else |
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# define SCFTORT_SHUTDOWN 1 |
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#endif |
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torture_param(bool, shutdown, SCFTORT_SHUTDOWN, "Shutdown at end of torture test."); |
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struct scf_statistics { |
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struct task_struct *task; |
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int cpu; |
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long long n_resched; |
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long long n_single; |
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long long n_single_ofl; |
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long long n_single_rpc; |
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long long n_single_rpc_ofl; |
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long long n_single_wait; |
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long long n_single_wait_ofl; |
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long long n_many; |
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long long n_many_wait; |
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long long n_all; |
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long long n_all_wait; |
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}; |
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static struct scf_statistics *scf_stats_p; |
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static struct task_struct *scf_torture_stats_task; |
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static DEFINE_PER_CPU(long long, scf_invoked_count); |
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// Data for random primitive selection |
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#define SCF_PRIM_RESCHED 0 |
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#define SCF_PRIM_SINGLE 1 |
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#define SCF_PRIM_SINGLE_RPC 2 |
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#define SCF_PRIM_MANY 3 |
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#define SCF_PRIM_ALL 4 |
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#define SCF_NPRIMS 8 // Need wait and no-wait versions of each, |
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// except for SCF_PRIM_RESCHED and |
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// SCF_PRIM_SINGLE_RPC. |
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static char *scf_prim_name[] = { |
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"resched_cpu", |
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"smp_call_function_single", |
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"smp_call_function_single_rpc", |
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"smp_call_function_many", |
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"smp_call_function", |
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}; |
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struct scf_selector { |
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unsigned long scfs_weight; |
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int scfs_prim; |
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bool scfs_wait; |
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}; |
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static struct scf_selector scf_sel_array[SCF_NPRIMS]; |
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static int scf_sel_array_len; |
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static unsigned long scf_sel_totweight; |
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// Communicate between caller and handler. |
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struct scf_check { |
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bool scfc_in; |
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bool scfc_out; |
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int scfc_cpu; // -1 for not _single(). |
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bool scfc_wait; |
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bool scfc_rpc; |
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struct completion scfc_completion; |
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}; |
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// Use to wait for all threads to start. |
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static atomic_t n_started; |
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static atomic_t n_errs; |
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static atomic_t n_mb_in_errs; |
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static atomic_t n_mb_out_errs; |
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static atomic_t n_alloc_errs; |
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static bool scfdone; |
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static char *bangstr = ""; |
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static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand); |
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extern void resched_cpu(int cpu); // An alternative IPI vector. |
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// Print torture statistics. Caller must ensure serialization. |
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static void scf_torture_stats_print(void) |
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{ |
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int cpu; |
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int i; |
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long long invoked_count = 0; |
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bool isdone = READ_ONCE(scfdone); |
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struct scf_statistics scfs = {}; |
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for_each_possible_cpu(cpu) |
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invoked_count += data_race(per_cpu(scf_invoked_count, cpu)); |
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for (i = 0; i < nthreads; i++) { |
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scfs.n_resched += scf_stats_p[i].n_resched; |
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scfs.n_single += scf_stats_p[i].n_single; |
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scfs.n_single_ofl += scf_stats_p[i].n_single_ofl; |
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scfs.n_single_rpc += scf_stats_p[i].n_single_rpc; |
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scfs.n_single_wait += scf_stats_p[i].n_single_wait; |
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scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl; |
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scfs.n_many += scf_stats_p[i].n_many; |
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scfs.n_many_wait += scf_stats_p[i].n_many_wait; |
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scfs.n_all += scf_stats_p[i].n_all; |
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scfs.n_all_wait += scf_stats_p[i].n_all_wait; |
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} |
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if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || |
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atomic_read(&n_mb_out_errs) || atomic_read(&n_alloc_errs)) |
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bangstr = "!!! "; |
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pr_alert("%s %sscf_invoked_count %s: %lld resched: %lld single: %lld/%lld single_ofl: %lld/%lld single_rpc: %lld single_rpc_ofl: %lld many: %lld/%lld all: %lld/%lld ", |
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SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, scfs.n_resched, |
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scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl, |
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scfs.n_single_rpc, scfs.n_single_rpc_ofl, |
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scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait); |
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torture_onoff_stats(); |
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pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n", atomic_read(&n_errs), |
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atomic_read(&n_mb_in_errs), atomic_read(&n_mb_out_errs), |
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atomic_read(&n_alloc_errs)); |
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} |
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// Periodically prints torture statistics, if periodic statistics printing |
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// was specified via the stat_interval module parameter. |
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static int |
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scf_torture_stats(void *arg) |
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{ |
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VERBOSE_TOROUT_STRING("scf_torture_stats task started"); |
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do { |
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schedule_timeout_interruptible(stat_interval * HZ); |
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scf_torture_stats_print(); |
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torture_shutdown_absorb("scf_torture_stats"); |
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} while (!torture_must_stop()); |
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torture_kthread_stopping("scf_torture_stats"); |
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return 0; |
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} |
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// Add a primitive to the scf_sel_array[]. |
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static void scf_sel_add(unsigned long weight, int prim, bool wait) |
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{ |
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struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len]; |
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// If no weight, if array would overflow, if computing three-place |
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// percentages would overflow, or if the scf_prim_name[] array would |
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// overflow, don't bother. In the last three two cases, complain. |
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if (!weight || |
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WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) || |
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WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) || |
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WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name))) |
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return; |
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scf_sel_totweight += weight; |
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scfsp->scfs_weight = scf_sel_totweight; |
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scfsp->scfs_prim = prim; |
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scfsp->scfs_wait = wait; |
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scf_sel_array_len++; |
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} |
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// Dump out weighting percentages for scf_prim_name[] array. |
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static void scf_sel_dump(void) |
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{ |
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int i; |
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unsigned long oldw = 0; |
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struct scf_selector *scfsp; |
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unsigned long w; |
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for (i = 0; i < scf_sel_array_len; i++) { |
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scfsp = &scf_sel_array[i]; |
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w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight; |
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pr_info("%s: %3lu.%03lu %s(%s)\n", __func__, w / 1000, w % 1000, |
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scf_prim_name[scfsp->scfs_prim], |
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scfsp->scfs_wait ? "wait" : "nowait"); |
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oldw = scfsp->scfs_weight; |
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} |
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} |
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// Randomly pick a primitive and wait/nowait, based on weightings. |
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static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp) |
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{ |
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int i; |
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unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1); |
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for (i = 0; i < scf_sel_array_len; i++) |
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if (scf_sel_array[i].scfs_weight >= w) |
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return &scf_sel_array[i]; |
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WARN_ON_ONCE(1); |
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return &scf_sel_array[0]; |
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} |
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// Update statistics and occasionally burn up mass quantities of CPU time, |
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// if told to do so via scftorture.longwait. Otherwise, occasionally burn |
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// a little bit. |
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static void scf_handler(void *scfc_in) |
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{ |
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int i; |
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int j; |
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unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand)); |
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struct scf_check *scfcp = scfc_in; |
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if (likely(scfcp)) { |
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WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers. |
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if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in)))) |
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atomic_inc(&n_mb_in_errs); |
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} |
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this_cpu_inc(scf_invoked_count); |
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if (longwait <= 0) { |
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if (!(r & 0xffc0)) |
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udelay(r & 0x3f); |
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goto out; |
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} |
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if (r & 0xfff) |
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goto out; |
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r = (r >> 12); |
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if (longwait <= 0) { |
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udelay((r & 0xff) + 1); |
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goto out; |
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} |
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r = r % longwait + 1; |
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for (i = 0; i < r; i++) { |
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for (j = 0; j < 1000; j++) { |
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udelay(1000); |
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cpu_relax(); |
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} |
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} |
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out: |
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if (unlikely(!scfcp)) |
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return; |
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if (scfcp->scfc_wait) { |
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WRITE_ONCE(scfcp->scfc_out, true); |
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if (scfcp->scfc_rpc) |
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complete(&scfcp->scfc_completion); |
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} else { |
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kfree(scfcp); |
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} |
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} |
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// As above, but check for correct CPU. |
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static void scf_handler_1(void *scfc_in) |
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{ |
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struct scf_check *scfcp = scfc_in; |
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if (likely(scfcp) && WARN_ONCE(smp_processor_id() != scfcp->scfc_cpu, "%s: Wanted CPU %d got CPU %d\n", __func__, scfcp->scfc_cpu, smp_processor_id())) { |
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atomic_inc(&n_errs); |
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} |
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scf_handler(scfcp); |
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} |
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// Randomly do an smp_call_function*() invocation. |
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static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp) |
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{ |
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uintptr_t cpu; |
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int ret = 0; |
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struct scf_check *scfcp = NULL; |
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struct scf_selector *scfsp = scf_sel_rand(trsp); |
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if (use_cpus_read_lock) |
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cpus_read_lock(); |
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else |
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preempt_disable(); |
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if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) { |
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scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC); |
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if (WARN_ON_ONCE(!scfcp)) { |
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atomic_inc(&n_alloc_errs); |
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} else { |
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scfcp->scfc_cpu = -1; |
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scfcp->scfc_wait = scfsp->scfs_wait; |
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scfcp->scfc_out = false; |
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scfcp->scfc_rpc = false; |
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} |
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} |
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switch (scfsp->scfs_prim) { |
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case SCF_PRIM_RESCHED: |
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if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) { |
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cpu = torture_random(trsp) % nr_cpu_ids; |
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scfp->n_resched++; |
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resched_cpu(cpu); |
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} |
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break; |
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case SCF_PRIM_SINGLE: |
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cpu = torture_random(trsp) % nr_cpu_ids; |
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if (scfsp->scfs_wait) |
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scfp->n_single_wait++; |
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else |
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scfp->n_single++; |
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if (scfcp) { |
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scfcp->scfc_cpu = cpu; |
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barrier(); // Prevent race-reduction compiler optimizations. |
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scfcp->scfc_in = true; |
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} |
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ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait); |
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if (ret) { |
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if (scfsp->scfs_wait) |
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scfp->n_single_wait_ofl++; |
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else |
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scfp->n_single_ofl++; |
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kfree(scfcp); |
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scfcp = NULL; |
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} |
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break; |
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case SCF_PRIM_SINGLE_RPC: |
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if (!scfcp) |
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break; |
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cpu = torture_random(trsp) % nr_cpu_ids; |
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scfp->n_single_rpc++; |
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scfcp->scfc_cpu = cpu; |
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scfcp->scfc_wait = true; |
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init_completion(&scfcp->scfc_completion); |
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scfcp->scfc_rpc = true; |
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barrier(); // Prevent race-reduction compiler optimizations. |
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scfcp->scfc_in = true; |
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ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, 0); |
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if (!ret) { |
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if (use_cpus_read_lock) |
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cpus_read_unlock(); |
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else |
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preempt_enable(); |
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wait_for_completion(&scfcp->scfc_completion); |
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if (use_cpus_read_lock) |
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cpus_read_lock(); |
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else |
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preempt_disable(); |
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} else { |
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scfp->n_single_rpc_ofl++; |
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kfree(scfcp); |
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scfcp = NULL; |
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} |
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break; |
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case SCF_PRIM_MANY: |
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if (scfsp->scfs_wait) |
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scfp->n_many_wait++; |
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else |
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scfp->n_many++; |
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if (scfcp) { |
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barrier(); // Prevent race-reduction compiler optimizations. |
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scfcp->scfc_in = true; |
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} |
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smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait); |
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break; |
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case SCF_PRIM_ALL: |
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if (scfsp->scfs_wait) |
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scfp->n_all_wait++; |
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else |
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scfp->n_all++; |
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if (scfcp) { |
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barrier(); // Prevent race-reduction compiler optimizations. |
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scfcp->scfc_in = true; |
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} |
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smp_call_function(scf_handler, scfcp, scfsp->scfs_wait); |
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break; |
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default: |
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WARN_ON_ONCE(1); |
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if (scfcp) |
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scfcp->scfc_out = true; |
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} |
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if (scfcp && scfsp->scfs_wait) { |
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if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) && |
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!scfcp->scfc_out)) { |
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pr_warn("%s: Memory-ordering failure, scfs_prim: %d.\n", __func__, scfsp->scfs_prim); |
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atomic_inc(&n_mb_out_errs); // Leak rather than trash! |
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} else { |
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kfree(scfcp); |
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} |
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barrier(); // Prevent race-reduction compiler optimizations. |
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} |
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if (use_cpus_read_lock) |
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cpus_read_unlock(); |
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else |
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preempt_enable(); |
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if (!(torture_random(trsp) & 0xfff)) |
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schedule_timeout_uninterruptible(1); |
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} |
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// SCF test kthread. Repeatedly does calls to members of the |
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// smp_call_function() family of functions. |
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static int scftorture_invoker(void *arg) |
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{ |
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int cpu; |
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int curcpu; |
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DEFINE_TORTURE_RANDOM(rand); |
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struct scf_statistics *scfp = (struct scf_statistics *)arg; |
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bool was_offline = false; |
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VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu); |
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cpu = scfp->cpu % nr_cpu_ids; |
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WARN_ON_ONCE(set_cpus_allowed_ptr(current, cpumask_of(cpu))); |
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set_user_nice(current, MAX_NICE); |
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if (holdoff) |
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schedule_timeout_interruptible(holdoff * HZ); |
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VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, raw_smp_processor_id()); |
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// Make sure that the CPU is affinitized appropriately during testing. |
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curcpu = raw_smp_processor_id(); |
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WARN_ONCE(curcpu != scfp->cpu % nr_cpu_ids, |
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"%s: Wanted CPU %d, running on %d, nr_cpu_ids = %d\n", |
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__func__, scfp->cpu, curcpu, nr_cpu_ids); |
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if (!atomic_dec_return(&n_started)) |
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while (atomic_read_acquire(&n_started)) { |
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if (torture_must_stop()) { |
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VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu); |
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goto end; |
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} |
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schedule_timeout_uninterruptible(1); |
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} |
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VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu); |
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do { |
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scftorture_invoke_one(scfp, &rand); |
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while (cpu_is_offline(cpu) && !torture_must_stop()) { |
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schedule_timeout_interruptible(HZ / 5); |
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was_offline = true; |
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} |
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if (was_offline) { |
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set_cpus_allowed_ptr(current, cpumask_of(cpu)); |
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was_offline = false; |
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} |
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cond_resched(); |
|
stutter_wait("scftorture_invoker"); |
|
} while (!torture_must_stop()); |
|
|
|
VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu); |
|
end: |
|
torture_kthread_stopping("scftorture_invoker"); |
|
return 0; |
|
} |
|
|
|
static void |
|
scftorture_print_module_parms(const char *tag) |
|
{ |
|
pr_alert(SCFTORT_FLAG |
|
"--- %s: verbose=%d holdoff=%d longwait=%d nthreads=%d onoff_holdoff=%d onoff_interval=%d shutdown_secs=%d stat_interval=%d stutter=%d use_cpus_read_lock=%d, weight_resched=%d, weight_single=%d, weight_single_rpc=%d, weight_single_wait=%d, weight_many=%d, weight_many_wait=%d, weight_all=%d, weight_all_wait=%d\n", tag, |
|
verbose, holdoff, longwait, nthreads, onoff_holdoff, onoff_interval, shutdown, stat_interval, stutter, use_cpus_read_lock, weight_resched, weight_single, weight_single_rpc, weight_single_wait, weight_many, weight_many_wait, weight_all, weight_all_wait); |
|
} |
|
|
|
static void scf_cleanup_handler(void *unused) |
|
{ |
|
} |
|
|
|
static void scf_torture_cleanup(void) |
|
{ |
|
int i; |
|
|
|
if (torture_cleanup_begin()) |
|
return; |
|
|
|
WRITE_ONCE(scfdone, true); |
|
if (nthreads && scf_stats_p) |
|
for (i = 0; i < nthreads; i++) |
|
torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task); |
|
else |
|
goto end; |
|
smp_call_function(scf_cleanup_handler, NULL, 0); |
|
torture_stop_kthread(scf_torture_stats, scf_torture_stats_task); |
|
scf_torture_stats_print(); // -After- the stats thread is stopped! |
|
kfree(scf_stats_p); // -After- the last stats print has completed! |
|
scf_stats_p = NULL; |
|
|
|
if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs)) |
|
scftorture_print_module_parms("End of test: FAILURE"); |
|
else if (torture_onoff_failures()) |
|
scftorture_print_module_parms("End of test: LOCK_HOTPLUG"); |
|
else |
|
scftorture_print_module_parms("End of test: SUCCESS"); |
|
|
|
end: |
|
torture_cleanup_end(); |
|
} |
|
|
|
static int __init scf_torture_init(void) |
|
{ |
|
long i; |
|
int firsterr = 0; |
|
unsigned long weight_resched1 = weight_resched; |
|
unsigned long weight_single1 = weight_single; |
|
unsigned long weight_single_rpc1 = weight_single_rpc; |
|
unsigned long weight_single_wait1 = weight_single_wait; |
|
unsigned long weight_many1 = weight_many; |
|
unsigned long weight_many_wait1 = weight_many_wait; |
|
unsigned long weight_all1 = weight_all; |
|
unsigned long weight_all_wait1 = weight_all_wait; |
|
|
|
if (!torture_init_begin(SCFTORT_STRING, verbose)) |
|
return -EBUSY; |
|
|
|
scftorture_print_module_parms("Start of test"); |
|
|
|
if (weight_resched == -1 && |
|
weight_single == -1 && weight_single_rpc == -1 && weight_single_wait == -1 && |
|
weight_many == -1 && weight_many_wait == -1 && |
|
weight_all == -1 && weight_all_wait == -1) { |
|
weight_resched1 = 2 * nr_cpu_ids; |
|
weight_single1 = 2 * nr_cpu_ids; |
|
weight_single_rpc1 = 2 * nr_cpu_ids; |
|
weight_single_wait1 = 2 * nr_cpu_ids; |
|
weight_many1 = 2; |
|
weight_many_wait1 = 2; |
|
weight_all1 = 1; |
|
weight_all_wait1 = 1; |
|
} else { |
|
if (weight_resched == -1) |
|
weight_resched1 = 0; |
|
if (weight_single == -1) |
|
weight_single1 = 0; |
|
if (weight_single_rpc == -1) |
|
weight_single_rpc1 = 0; |
|
if (weight_single_wait == -1) |
|
weight_single_wait1 = 0; |
|
if (weight_many == -1) |
|
weight_many1 = 0; |
|
if (weight_many_wait == -1) |
|
weight_many_wait1 = 0; |
|
if (weight_all == -1) |
|
weight_all1 = 0; |
|
if (weight_all_wait == -1) |
|
weight_all_wait1 = 0; |
|
} |
|
if (weight_single1 == 0 && weight_single_rpc1 == 0 && weight_single_wait1 == 0 && |
|
weight_many1 == 0 && weight_many_wait1 == 0 && |
|
weight_all1 == 0 && weight_all_wait1 == 0) { |
|
VERBOSE_SCFTORTOUT_ERRSTRING("all zero weights makes no sense"); |
|
firsterr = -EINVAL; |
|
goto unwind; |
|
} |
|
if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) |
|
scf_sel_add(weight_resched1, SCF_PRIM_RESCHED, false); |
|
else if (weight_resched1) |
|
VERBOSE_SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored"); |
|
scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false); |
|
scf_sel_add(weight_single_rpc1, SCF_PRIM_SINGLE_RPC, true); |
|
scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true); |
|
scf_sel_add(weight_many1, SCF_PRIM_MANY, false); |
|
scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true); |
|
scf_sel_add(weight_all1, SCF_PRIM_ALL, false); |
|
scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true); |
|
scf_sel_dump(); |
|
|
|
if (onoff_interval > 0) { |
|
firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL); |
|
if (firsterr) |
|
goto unwind; |
|
} |
|
if (shutdown_secs > 0) { |
|
firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup); |
|
if (firsterr) |
|
goto unwind; |
|
} |
|
if (stutter > 0) { |
|
firsterr = torture_stutter_init(stutter, stutter); |
|
if (firsterr) |
|
goto unwind; |
|
} |
|
|
|
// Worker tasks invoking smp_call_function(). |
|
if (nthreads < 0) |
|
nthreads = num_online_cpus(); |
|
scf_stats_p = kcalloc(nthreads, sizeof(scf_stats_p[0]), GFP_KERNEL); |
|
if (!scf_stats_p) { |
|
VERBOSE_SCFTORTOUT_ERRSTRING("out of memory"); |
|
firsterr = -ENOMEM; |
|
goto unwind; |
|
} |
|
|
|
VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads\n", nthreads); |
|
|
|
atomic_set(&n_started, nthreads); |
|
for (i = 0; i < nthreads; i++) { |
|
scf_stats_p[i].cpu = i; |
|
firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i], |
|
scf_stats_p[i].task); |
|
if (firsterr) |
|
goto unwind; |
|
} |
|
if (stat_interval > 0) { |
|
firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task); |
|
if (firsterr) |
|
goto unwind; |
|
} |
|
|
|
torture_init_end(); |
|
return 0; |
|
|
|
unwind: |
|
torture_init_end(); |
|
scf_torture_cleanup(); |
|
return firsterr; |
|
} |
|
|
|
module_init(scf_torture_init); |
|
module_exit(scf_torture_cleanup);
|
|
|