![Kees Cook](/assets/img/avatar_default.png)
The vmalloc() function has no 2-factor argument form, so multiplication factors need to be wrapped in array_size(). This patch replaces cases of: vmalloc(a * b) with: vmalloc(array_size(a, b)) as well as handling cases of: vmalloc(a * b * c) with: vmalloc(array3_size(a, b, c)) This does, however, attempt to ignore constant size factors like: vmalloc(4 * 1024) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( vmalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | vmalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( vmalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | vmalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | vmalloc( - sizeof(char) * (COUNT) + COUNT , ...) | vmalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | vmalloc( - sizeof(u8) * COUNT + COUNT , ...) | vmalloc( - sizeof(__u8) * COUNT + COUNT , ...) | vmalloc( - sizeof(char) * COUNT + COUNT , ...) | vmalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( vmalloc( - sizeof(TYPE) * (COUNT_ID) + array_size(COUNT_ID, sizeof(TYPE)) , ...) | vmalloc( - sizeof(TYPE) * COUNT_ID + array_size(COUNT_ID, sizeof(TYPE)) , ...) | vmalloc( - sizeof(TYPE) * (COUNT_CONST) + array_size(COUNT_CONST, sizeof(TYPE)) , ...) | vmalloc( - sizeof(TYPE) * COUNT_CONST + array_size(COUNT_CONST, sizeof(TYPE)) , ...) | vmalloc( - sizeof(THING) * (COUNT_ID) + array_size(COUNT_ID, sizeof(THING)) , ...) | vmalloc( - sizeof(THING) * COUNT_ID + array_size(COUNT_ID, sizeof(THING)) , ...) | vmalloc( - sizeof(THING) * (COUNT_CONST) + array_size(COUNT_CONST, sizeof(THING)) , ...) | vmalloc( - sizeof(THING) * COUNT_CONST + array_size(COUNT_CONST, sizeof(THING)) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ vmalloc( - SIZE * COUNT + array_size(COUNT, SIZE) , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( vmalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | vmalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | vmalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | vmalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | vmalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | vmalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | vmalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | vmalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( vmalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | vmalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | vmalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | vmalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | vmalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | vmalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( vmalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | vmalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | vmalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | vmalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | vmalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | vmalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | vmalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | vmalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( vmalloc(C1 * C2 * C3, ...) | vmalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants. @@ expression E1, E2; constant C1, C2; @@ ( vmalloc(C1 * C2, ...) | vmalloc( - E1 * E2 + array_size(E1, E2) , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
1941 lines
55 KiB
C
1941 lines
55 KiB
C
/*
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* Read-Copy Update module-based torture test facility
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can access it online at
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* http://www.gnu.org/licenses/gpl-2.0.html.
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*
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* Copyright (C) IBM Corporation, 2005, 2006
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*
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* Authors: Paul E. McKenney <paulmck@us.ibm.com>
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* Josh Triplett <josh@joshtriplett.org>
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*
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* See also: Documentation/RCU/torture.txt
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kthread.h>
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#include <linux/err.h>
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#include <linux/spinlock.h>
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#include <linux/smp.h>
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#include <linux/rcupdate.h>
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#include <linux/interrupt.h>
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#include <linux/sched/signal.h>
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#include <uapi/linux/sched/types.h>
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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/moduleparam.h>
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#include <linux/percpu.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/freezer.h>
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#include <linux/cpu.h>
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#include <linux/delay.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/trace_clock.h>
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#include <asm/byteorder.h>
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#include <linux/torture.h>
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#include <linux/vmalloc.h>
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#include <linux/sched/debug.h>
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#include "rcu.h"
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and Josh Triplett <josh@joshtriplett.org>");
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torture_param(int, cbflood_inter_holdoff, HZ,
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"Holdoff between floods (jiffies)");
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torture_param(int, cbflood_intra_holdoff, 1,
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"Holdoff between bursts (jiffies)");
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torture_param(int, cbflood_n_burst, 3, "# bursts in flood, zero to disable");
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torture_param(int, cbflood_n_per_burst, 20000,
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"# callbacks per burst in flood");
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torture_param(int, fqs_duration, 0,
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"Duration of fqs bursts (us), 0 to disable");
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torture_param(int, fqs_holdoff, 0, "Holdoff time within fqs bursts (us)");
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torture_param(int, fqs_stutter, 3, "Wait time between fqs bursts (s)");
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torture_param(bool, gp_cond, false, "Use conditional/async GP wait primitives");
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torture_param(bool, gp_exp, false, "Use expedited GP wait primitives");
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torture_param(bool, gp_normal, false,
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"Use normal (non-expedited) GP wait primitives");
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torture_param(bool, gp_sync, false, "Use synchronous GP wait primitives");
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torture_param(int, irqreader, 1, "Allow RCU readers from irq handlers");
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torture_param(int, n_barrier_cbs, 0,
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"# of callbacks/kthreads for barrier testing");
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torture_param(int, nfakewriters, 4, "Number of RCU fake writer threads");
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torture_param(int, nreaders, -1, "Number of RCU reader threads");
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torture_param(int, object_debug, 0,
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"Enable debug-object double call_rcu() testing");
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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,
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"Time between CPU hotplugs (s), 0=disable");
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torture_param(int, shuffle_interval, 3, "Number of seconds between shuffles");
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torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable.");
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torture_param(int, stall_cpu, 0, "Stall duration (s), zero to disable.");
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torture_param(int, stall_cpu_holdoff, 10,
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"Time to wait before starting stall (s).");
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torture_param(int, stall_cpu_irqsoff, 0, "Disable interrupts while stalling.");
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torture_param(int, stat_interval, 60,
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"Number of seconds between stats printk()s");
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torture_param(int, stutter, 5, "Number of seconds to run/halt test");
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torture_param(int, test_boost, 1, "Test RCU prio boost: 0=no, 1=maybe, 2=yes.");
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torture_param(int, test_boost_duration, 4,
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"Duration of each boost test, seconds.");
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torture_param(int, test_boost_interval, 7,
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"Interval between boost tests, seconds.");
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torture_param(bool, test_no_idle_hz, true,
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"Test support for tickless idle CPUs");
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torture_param(bool, verbose, true,
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"Enable verbose debugging printk()s");
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static char *torture_type = "rcu";
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module_param(torture_type, charp, 0444);
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MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, ...)");
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static int nrealreaders;
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static int ncbflooders;
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static struct task_struct *writer_task;
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static struct task_struct **fakewriter_tasks;
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static struct task_struct **reader_tasks;
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static struct task_struct *stats_task;
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static struct task_struct **cbflood_task;
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static struct task_struct *fqs_task;
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static struct task_struct *boost_tasks[NR_CPUS];
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static struct task_struct *stall_task;
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static struct task_struct **barrier_cbs_tasks;
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static struct task_struct *barrier_task;
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#define RCU_TORTURE_PIPE_LEN 10
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struct rcu_torture {
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struct rcu_head rtort_rcu;
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int rtort_pipe_count;
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struct list_head rtort_free;
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int rtort_mbtest;
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};
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static LIST_HEAD(rcu_torture_freelist);
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static struct rcu_torture __rcu *rcu_torture_current;
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static unsigned long rcu_torture_current_version;
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static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN];
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static DEFINE_SPINLOCK(rcu_torture_lock);
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static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count);
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static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch);
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static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1];
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static atomic_t n_rcu_torture_alloc;
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static atomic_t n_rcu_torture_alloc_fail;
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static atomic_t n_rcu_torture_free;
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static atomic_t n_rcu_torture_mberror;
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static atomic_t n_rcu_torture_error;
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static long n_rcu_torture_barrier_error;
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static long n_rcu_torture_boost_ktrerror;
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static long n_rcu_torture_boost_rterror;
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static long n_rcu_torture_boost_failure;
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static long n_rcu_torture_boosts;
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static long n_rcu_torture_timers;
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static long n_barrier_attempts;
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static long n_barrier_successes;
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static atomic_long_t n_cbfloods;
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static struct list_head rcu_torture_removed;
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static int rcu_torture_writer_state;
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#define RTWS_FIXED_DELAY 0
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#define RTWS_DELAY 1
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#define RTWS_REPLACE 2
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#define RTWS_DEF_FREE 3
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#define RTWS_EXP_SYNC 4
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#define RTWS_COND_GET 5
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#define RTWS_COND_SYNC 6
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#define RTWS_SYNC 7
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#define RTWS_STUTTER 8
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#define RTWS_STOPPING 9
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static const char * const rcu_torture_writer_state_names[] = {
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"RTWS_FIXED_DELAY",
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"RTWS_DELAY",
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"RTWS_REPLACE",
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"RTWS_DEF_FREE",
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"RTWS_EXP_SYNC",
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"RTWS_COND_GET",
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"RTWS_COND_SYNC",
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"RTWS_SYNC",
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"RTWS_STUTTER",
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"RTWS_STOPPING",
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};
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static const char *rcu_torture_writer_state_getname(void)
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{
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unsigned int i = READ_ONCE(rcu_torture_writer_state);
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if (i >= ARRAY_SIZE(rcu_torture_writer_state_names))
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return "???";
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return rcu_torture_writer_state_names[i];
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}
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#if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU)
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#define rcu_can_boost() 1
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#else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */
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#define rcu_can_boost() 0
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#endif /* #else #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */
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#ifdef CONFIG_RCU_TRACE
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static u64 notrace rcu_trace_clock_local(void)
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{
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u64 ts = trace_clock_local();
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(void)do_div(ts, NSEC_PER_USEC);
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return ts;
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}
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#else /* #ifdef CONFIG_RCU_TRACE */
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static u64 notrace rcu_trace_clock_local(void)
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{
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return 0ULL;
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}
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#endif /* #else #ifdef CONFIG_RCU_TRACE */
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static unsigned long boost_starttime; /* jiffies of next boost test start. */
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static DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */
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/* and boost task create/destroy. */
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static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */
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static bool barrier_phase; /* Test phase. */
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static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */
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static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */
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static DECLARE_WAIT_QUEUE_HEAD(barrier_wq);
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/*
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* Allocate an element from the rcu_tortures pool.
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*/
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static struct rcu_torture *
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rcu_torture_alloc(void)
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{
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struct list_head *p;
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spin_lock_bh(&rcu_torture_lock);
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if (list_empty(&rcu_torture_freelist)) {
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atomic_inc(&n_rcu_torture_alloc_fail);
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spin_unlock_bh(&rcu_torture_lock);
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return NULL;
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}
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atomic_inc(&n_rcu_torture_alloc);
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p = rcu_torture_freelist.next;
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list_del_init(p);
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spin_unlock_bh(&rcu_torture_lock);
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return container_of(p, struct rcu_torture, rtort_free);
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}
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/*
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* Free an element to the rcu_tortures pool.
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*/
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static void
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rcu_torture_free(struct rcu_torture *p)
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{
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atomic_inc(&n_rcu_torture_free);
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spin_lock_bh(&rcu_torture_lock);
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list_add_tail(&p->rtort_free, &rcu_torture_freelist);
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spin_unlock_bh(&rcu_torture_lock);
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}
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/*
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* Operations vector for selecting different types of tests.
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*/
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struct rcu_torture_ops {
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int ttype;
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void (*init)(void);
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void (*cleanup)(void);
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int (*readlock)(void);
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void (*read_delay)(struct torture_random_state *rrsp);
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void (*readunlock)(int idx);
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unsigned long (*started)(void);
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unsigned long (*completed)(void);
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void (*deferred_free)(struct rcu_torture *p);
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void (*sync)(void);
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void (*exp_sync)(void);
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unsigned long (*get_state)(void);
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void (*cond_sync)(unsigned long oldstate);
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call_rcu_func_t call;
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void (*cb_barrier)(void);
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void (*fqs)(void);
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void (*stats)(void);
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int irq_capable;
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int can_boost;
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const char *name;
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};
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static struct rcu_torture_ops *cur_ops;
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/*
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* Definitions for rcu torture testing.
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*/
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static int rcu_torture_read_lock(void) __acquires(RCU)
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{
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rcu_read_lock();
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return 0;
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}
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static void rcu_read_delay(struct torture_random_state *rrsp)
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{
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unsigned long started;
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unsigned long completed;
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const unsigned long shortdelay_us = 200;
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const unsigned long longdelay_ms = 50;
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unsigned long long ts;
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/* We want a short delay sometimes to make a reader delay the grace
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* period, and we want a long delay occasionally to trigger
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* force_quiescent_state. */
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if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) {
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started = cur_ops->completed();
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ts = rcu_trace_clock_local();
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mdelay(longdelay_ms);
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completed = cur_ops->completed();
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do_trace_rcu_torture_read(cur_ops->name, NULL, ts,
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started, completed);
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}
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if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us)))
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udelay(shortdelay_us);
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if (!preempt_count() &&
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!(torture_random(rrsp) % (nrealreaders * 500)))
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torture_preempt_schedule(); /* QS only if preemptible. */
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}
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static void rcu_torture_read_unlock(int idx) __releases(RCU)
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{
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rcu_read_unlock();
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}
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/*
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* Update callback in the pipe. This should be invoked after a grace period.
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*/
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static bool
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rcu_torture_pipe_update_one(struct rcu_torture *rp)
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{
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int i;
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i = rp->rtort_pipe_count;
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if (i > RCU_TORTURE_PIPE_LEN)
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i = RCU_TORTURE_PIPE_LEN;
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atomic_inc(&rcu_torture_wcount[i]);
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if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) {
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rp->rtort_mbtest = 0;
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return true;
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}
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return false;
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}
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/*
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* Update all callbacks in the pipe. Suitable for synchronous grace-period
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* primitives.
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*/
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static void
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rcu_torture_pipe_update(struct rcu_torture *old_rp)
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{
|
|
struct rcu_torture *rp;
|
|
struct rcu_torture *rp1;
|
|
|
|
if (old_rp)
|
|
list_add(&old_rp->rtort_free, &rcu_torture_removed);
|
|
list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) {
|
|
if (rcu_torture_pipe_update_one(rp)) {
|
|
list_del(&rp->rtort_free);
|
|
rcu_torture_free(rp);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
rcu_torture_cb(struct rcu_head *p)
|
|
{
|
|
struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu);
|
|
|
|
if (torture_must_stop_irq()) {
|
|
/* Test is ending, just drop callbacks on the floor. */
|
|
/* The next initialization will pick up the pieces. */
|
|
return;
|
|
}
|
|
if (rcu_torture_pipe_update_one(rp))
|
|
rcu_torture_free(rp);
|
|
else
|
|
cur_ops->deferred_free(rp);
|
|
}
|
|
|
|
static unsigned long rcu_no_completed(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void rcu_torture_deferred_free(struct rcu_torture *p)
|
|
{
|
|
call_rcu(&p->rtort_rcu, rcu_torture_cb);
|
|
}
|
|
|
|
static void rcu_sync_torture_init(void)
|
|
{
|
|
INIT_LIST_HEAD(&rcu_torture_removed);
|
|
}
|
|
|
|
static struct rcu_torture_ops rcu_ops = {
|
|
.ttype = RCU_FLAVOR,
|
|
.init = rcu_sync_torture_init,
|
|
.readlock = rcu_torture_read_lock,
|
|
.read_delay = rcu_read_delay,
|
|
.readunlock = rcu_torture_read_unlock,
|
|
.started = rcu_batches_started,
|
|
.completed = rcu_batches_completed,
|
|
.deferred_free = rcu_torture_deferred_free,
|
|
.sync = synchronize_rcu,
|
|
.exp_sync = synchronize_rcu_expedited,
|
|
.get_state = get_state_synchronize_rcu,
|
|
.cond_sync = cond_synchronize_rcu,
|
|
.call = call_rcu,
|
|
.cb_barrier = rcu_barrier,
|
|
.fqs = rcu_force_quiescent_state,
|
|
.stats = NULL,
|
|
.irq_capable = 1,
|
|
.can_boost = rcu_can_boost(),
|
|
.name = "rcu"
|
|
};
|
|
|
|
/*
|
|
* Definitions for rcu_bh torture testing.
|
|
*/
|
|
|
|
static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH)
|
|
{
|
|
rcu_read_lock_bh();
|
|
return 0;
|
|
}
|
|
|
|
static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH)
|
|
{
|
|
rcu_read_unlock_bh();
|
|
}
|
|
|
|
static void rcu_bh_torture_deferred_free(struct rcu_torture *p)
|
|
{
|
|
call_rcu_bh(&p->rtort_rcu, rcu_torture_cb);
|
|
}
|
|
|
|
static struct rcu_torture_ops rcu_bh_ops = {
|
|
.ttype = RCU_BH_FLAVOR,
|
|
.init = rcu_sync_torture_init,
|
|
.readlock = rcu_bh_torture_read_lock,
|
|
.read_delay = rcu_read_delay, /* just reuse rcu's version. */
|
|
.readunlock = rcu_bh_torture_read_unlock,
|
|
.started = rcu_batches_started_bh,
|
|
.completed = rcu_batches_completed_bh,
|
|
.deferred_free = rcu_bh_torture_deferred_free,
|
|
.sync = synchronize_rcu_bh,
|
|
.exp_sync = synchronize_rcu_bh_expedited,
|
|
.call = call_rcu_bh,
|
|
.cb_barrier = rcu_barrier_bh,
|
|
.fqs = rcu_bh_force_quiescent_state,
|
|
.stats = NULL,
|
|
.irq_capable = 1,
|
|
.name = "rcu_bh"
|
|
};
|
|
|
|
/*
|
|
* Don't even think about trying any of these in real life!!!
|
|
* The names includes "busted", and they really means it!
|
|
* The only purpose of these functions is to provide a buggy RCU
|
|
* implementation to make sure that rcutorture correctly emits
|
|
* buggy-RCU error messages.
|
|
*/
|
|
static void rcu_busted_torture_deferred_free(struct rcu_torture *p)
|
|
{
|
|
/* This is a deliberate bug for testing purposes only! */
|
|
rcu_torture_cb(&p->rtort_rcu);
|
|
}
|
|
|
|
static void synchronize_rcu_busted(void)
|
|
{
|
|
/* This is a deliberate bug for testing purposes only! */
|
|
}
|
|
|
|
static void
|
|
call_rcu_busted(struct rcu_head *head, rcu_callback_t func)
|
|
{
|
|
/* This is a deliberate bug for testing purposes only! */
|
|
func(head);
|
|
}
|
|
|
|
static struct rcu_torture_ops rcu_busted_ops = {
|
|
.ttype = INVALID_RCU_FLAVOR,
|
|
.init = rcu_sync_torture_init,
|
|
.readlock = rcu_torture_read_lock,
|
|
.read_delay = rcu_read_delay, /* just reuse rcu's version. */
|
|
.readunlock = rcu_torture_read_unlock,
|
|
.started = rcu_no_completed,
|
|
.completed = rcu_no_completed,
|
|
.deferred_free = rcu_busted_torture_deferred_free,
|
|
.sync = synchronize_rcu_busted,
|
|
.exp_sync = synchronize_rcu_busted,
|
|
.call = call_rcu_busted,
|
|
.cb_barrier = NULL,
|
|
.fqs = NULL,
|
|
.stats = NULL,
|
|
.irq_capable = 1,
|
|
.name = "busted"
|
|
};
|
|
|
|
/*
|
|
* Definitions for srcu torture testing.
|
|
*/
|
|
|
|
DEFINE_STATIC_SRCU(srcu_ctl);
|
|
static struct srcu_struct srcu_ctld;
|
|
static struct srcu_struct *srcu_ctlp = &srcu_ctl;
|
|
|
|
static int srcu_torture_read_lock(void) __acquires(srcu_ctlp)
|
|
{
|
|
return srcu_read_lock(srcu_ctlp);
|
|
}
|
|
|
|
static void srcu_read_delay(struct torture_random_state *rrsp)
|
|
{
|
|
long delay;
|
|
const long uspertick = 1000000 / HZ;
|
|
const long longdelay = 10;
|
|
|
|
/* We want there to be long-running readers, but not all the time. */
|
|
|
|
delay = torture_random(rrsp) %
|
|
(nrealreaders * 2 * longdelay * uspertick);
|
|
if (!delay && in_task())
|
|
schedule_timeout_interruptible(longdelay);
|
|
else
|
|
rcu_read_delay(rrsp);
|
|
}
|
|
|
|
static void srcu_torture_read_unlock(int idx) __releases(srcu_ctlp)
|
|
{
|
|
srcu_read_unlock(srcu_ctlp, idx);
|
|
}
|
|
|
|
static unsigned long srcu_torture_completed(void)
|
|
{
|
|
return srcu_batches_completed(srcu_ctlp);
|
|
}
|
|
|
|
static void srcu_torture_deferred_free(struct rcu_torture *rp)
|
|
{
|
|
call_srcu(srcu_ctlp, &rp->rtort_rcu, rcu_torture_cb);
|
|
}
|
|
|
|
static void srcu_torture_synchronize(void)
|
|
{
|
|
synchronize_srcu(srcu_ctlp);
|
|
}
|
|
|
|
static void srcu_torture_call(struct rcu_head *head,
|
|
rcu_callback_t func)
|
|
{
|
|
call_srcu(srcu_ctlp, head, func);
|
|
}
|
|
|
|
static void srcu_torture_barrier(void)
|
|
{
|
|
srcu_barrier(srcu_ctlp);
|
|
}
|
|
|
|
static void srcu_torture_stats(void)
|
|
{
|
|
srcu_torture_stats_print(srcu_ctlp, torture_type, TORTURE_FLAG);
|
|
}
|
|
|
|
static void srcu_torture_synchronize_expedited(void)
|
|
{
|
|
synchronize_srcu_expedited(srcu_ctlp);
|
|
}
|
|
|
|
static struct rcu_torture_ops srcu_ops = {
|
|
.ttype = SRCU_FLAVOR,
|
|
.init = rcu_sync_torture_init,
|
|
.readlock = srcu_torture_read_lock,
|
|
.read_delay = srcu_read_delay,
|
|
.readunlock = srcu_torture_read_unlock,
|
|
.started = NULL,
|
|
.completed = srcu_torture_completed,
|
|
.deferred_free = srcu_torture_deferred_free,
|
|
.sync = srcu_torture_synchronize,
|
|
.exp_sync = srcu_torture_synchronize_expedited,
|
|
.call = srcu_torture_call,
|
|
.cb_barrier = srcu_torture_barrier,
|
|
.stats = srcu_torture_stats,
|
|
.irq_capable = 1,
|
|
.name = "srcu"
|
|
};
|
|
|
|
static void srcu_torture_init(void)
|
|
{
|
|
rcu_sync_torture_init();
|
|
WARN_ON(init_srcu_struct(&srcu_ctld));
|
|
srcu_ctlp = &srcu_ctld;
|
|
}
|
|
|
|
static void srcu_torture_cleanup(void)
|
|
{
|
|
static DEFINE_TORTURE_RANDOM(rand);
|
|
|
|
if (torture_random(&rand) & 0x800)
|
|
cleanup_srcu_struct(&srcu_ctld);
|
|
else
|
|
cleanup_srcu_struct_quiesced(&srcu_ctld);
|
|
srcu_ctlp = &srcu_ctl; /* In case of a later rcutorture run. */
|
|
}
|
|
|
|
/* As above, but dynamically allocated. */
|
|
static struct rcu_torture_ops srcud_ops = {
|
|
.ttype = SRCU_FLAVOR,
|
|
.init = srcu_torture_init,
|
|
.cleanup = srcu_torture_cleanup,
|
|
.readlock = srcu_torture_read_lock,
|
|
.read_delay = srcu_read_delay,
|
|
.readunlock = srcu_torture_read_unlock,
|
|
.started = NULL,
|
|
.completed = srcu_torture_completed,
|
|
.deferred_free = srcu_torture_deferred_free,
|
|
.sync = srcu_torture_synchronize,
|
|
.exp_sync = srcu_torture_synchronize_expedited,
|
|
.call = srcu_torture_call,
|
|
.cb_barrier = srcu_torture_barrier,
|
|
.stats = srcu_torture_stats,
|
|
.irq_capable = 1,
|
|
.name = "srcud"
|
|
};
|
|
|
|
/*
|
|
* Definitions for sched torture testing.
|
|
*/
|
|
|
|
static int sched_torture_read_lock(void)
|
|
{
|
|
preempt_disable();
|
|
return 0;
|
|
}
|
|
|
|
static void sched_torture_read_unlock(int idx)
|
|
{
|
|
preempt_enable();
|
|
}
|
|
|
|
static void rcu_sched_torture_deferred_free(struct rcu_torture *p)
|
|
{
|
|
call_rcu_sched(&p->rtort_rcu, rcu_torture_cb);
|
|
}
|
|
|
|
static struct rcu_torture_ops sched_ops = {
|
|
.ttype = RCU_SCHED_FLAVOR,
|
|
.init = rcu_sync_torture_init,
|
|
.readlock = sched_torture_read_lock,
|
|
.read_delay = rcu_read_delay, /* just reuse rcu's version. */
|
|
.readunlock = sched_torture_read_unlock,
|
|
.started = rcu_batches_started_sched,
|
|
.completed = rcu_batches_completed_sched,
|
|
.deferred_free = rcu_sched_torture_deferred_free,
|
|
.sync = synchronize_sched,
|
|
.exp_sync = synchronize_sched_expedited,
|
|
.get_state = get_state_synchronize_sched,
|
|
.cond_sync = cond_synchronize_sched,
|
|
.call = call_rcu_sched,
|
|
.cb_barrier = rcu_barrier_sched,
|
|
.fqs = rcu_sched_force_quiescent_state,
|
|
.stats = NULL,
|
|
.irq_capable = 1,
|
|
.name = "sched"
|
|
};
|
|
|
|
/*
|
|
* Definitions for RCU-tasks torture testing.
|
|
*/
|
|
|
|
static int tasks_torture_read_lock(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void tasks_torture_read_unlock(int idx)
|
|
{
|
|
}
|
|
|
|
static void rcu_tasks_torture_deferred_free(struct rcu_torture *p)
|
|
{
|
|
call_rcu_tasks(&p->rtort_rcu, rcu_torture_cb);
|
|
}
|
|
|
|
static struct rcu_torture_ops tasks_ops = {
|
|
.ttype = RCU_TASKS_FLAVOR,
|
|
.init = rcu_sync_torture_init,
|
|
.readlock = tasks_torture_read_lock,
|
|
.read_delay = rcu_read_delay, /* just reuse rcu's version. */
|
|
.readunlock = tasks_torture_read_unlock,
|
|
.started = rcu_no_completed,
|
|
.completed = rcu_no_completed,
|
|
.deferred_free = rcu_tasks_torture_deferred_free,
|
|
.sync = synchronize_rcu_tasks,
|
|
.exp_sync = synchronize_rcu_tasks,
|
|
.call = call_rcu_tasks,
|
|
.cb_barrier = rcu_barrier_tasks,
|
|
.fqs = NULL,
|
|
.stats = NULL,
|
|
.irq_capable = 1,
|
|
.name = "tasks"
|
|
};
|
|
|
|
static bool __maybe_unused torturing_tasks(void)
|
|
{
|
|
return cur_ops == &tasks_ops;
|
|
}
|
|
|
|
/*
|
|
* RCU torture priority-boost testing. Runs one real-time thread per
|
|
* CPU for moderate bursts, repeatedly registering RCU callbacks and
|
|
* spinning waiting for them to be invoked. If a given callback takes
|
|
* too long to be invoked, we assume that priority inversion has occurred.
|
|
*/
|
|
|
|
struct rcu_boost_inflight {
|
|
struct rcu_head rcu;
|
|
int inflight;
|
|
};
|
|
|
|
static void rcu_torture_boost_cb(struct rcu_head *head)
|
|
{
|
|
struct rcu_boost_inflight *rbip =
|
|
container_of(head, struct rcu_boost_inflight, rcu);
|
|
|
|
/* Ensure RCU-core accesses precede clearing ->inflight */
|
|
smp_store_release(&rbip->inflight, 0);
|
|
}
|
|
|
|
static int rcu_torture_boost(void *arg)
|
|
{
|
|
unsigned long call_rcu_time;
|
|
unsigned long endtime;
|
|
unsigned long oldstarttime;
|
|
struct rcu_boost_inflight rbi = { .inflight = 0 };
|
|
struct sched_param sp;
|
|
|
|
VERBOSE_TOROUT_STRING("rcu_torture_boost started");
|
|
|
|
/* Set real-time priority. */
|
|
sp.sched_priority = 1;
|
|
if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) {
|
|
VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!");
|
|
n_rcu_torture_boost_rterror++;
|
|
}
|
|
|
|
init_rcu_head_on_stack(&rbi.rcu);
|
|
/* Each pass through the following loop does one boost-test cycle. */
|
|
do {
|
|
/* Wait for the next test interval. */
|
|
oldstarttime = boost_starttime;
|
|
while (ULONG_CMP_LT(jiffies, oldstarttime)) {
|
|
schedule_timeout_interruptible(oldstarttime - jiffies);
|
|
stutter_wait("rcu_torture_boost");
|
|
if (torture_must_stop())
|
|
goto checkwait;
|
|
}
|
|
|
|
/* Do one boost-test interval. */
|
|
endtime = oldstarttime + test_boost_duration * HZ;
|
|
call_rcu_time = jiffies;
|
|
while (ULONG_CMP_LT(jiffies, endtime)) {
|
|
/* If we don't have a callback in flight, post one. */
|
|
if (!smp_load_acquire(&rbi.inflight)) {
|
|
/* RCU core before ->inflight = 1. */
|
|
smp_store_release(&rbi.inflight, 1);
|
|
call_rcu(&rbi.rcu, rcu_torture_boost_cb);
|
|
if (jiffies - call_rcu_time >
|
|
test_boost_duration * HZ - HZ / 2) {
|
|
VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed");
|
|
n_rcu_torture_boost_failure++;
|
|
}
|
|
call_rcu_time = jiffies;
|
|
}
|
|
stutter_wait("rcu_torture_boost");
|
|
if (torture_must_stop())
|
|
goto checkwait;
|
|
}
|
|
|
|
/*
|
|
* Set the start time of the next test interval.
|
|
* Yes, this is vulnerable to long delays, but such
|
|
* delays simply cause a false negative for the next
|
|
* interval. Besides, we are running at RT priority,
|
|
* so delays should be relatively rare.
|
|
*/
|
|
while (oldstarttime == boost_starttime &&
|
|
!kthread_should_stop()) {
|
|
if (mutex_trylock(&boost_mutex)) {
|
|
boost_starttime = jiffies +
|
|
test_boost_interval * HZ;
|
|
n_rcu_torture_boosts++;
|
|
mutex_unlock(&boost_mutex);
|
|
break;
|
|
}
|
|
schedule_timeout_uninterruptible(1);
|
|
}
|
|
|
|
/* Go do the stutter. */
|
|
checkwait: stutter_wait("rcu_torture_boost");
|
|
} while (!torture_must_stop());
|
|
|
|
/* Clean up and exit. */
|
|
while (!kthread_should_stop() || smp_load_acquire(&rbi.inflight)) {
|
|
torture_shutdown_absorb("rcu_torture_boost");
|
|
schedule_timeout_uninterruptible(1);
|
|
}
|
|
destroy_rcu_head_on_stack(&rbi.rcu);
|
|
torture_kthread_stopping("rcu_torture_boost");
|
|
return 0;
|
|
}
|
|
|
|
static void rcu_torture_cbflood_cb(struct rcu_head *rhp)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* RCU torture callback-flood kthread. Repeatedly induces bursts of calls
|
|
* to call_rcu() or analogous, increasing the probability of occurrence
|
|
* of callback-overflow corner cases.
|
|
*/
|
|
static int
|
|
rcu_torture_cbflood(void *arg)
|
|
{
|
|
int err = 1;
|
|
int i;
|
|
int j;
|
|
struct rcu_head *rhp;
|
|
|
|
if (cbflood_n_per_burst > 0 &&
|
|
cbflood_inter_holdoff > 0 &&
|
|
cbflood_intra_holdoff > 0 &&
|
|
cur_ops->call &&
|
|
cur_ops->cb_barrier) {
|
|
rhp = vmalloc(array3_size(cbflood_n_burst,
|
|
cbflood_n_per_burst,
|
|
sizeof(*rhp)));
|
|
err = !rhp;
|
|
}
|
|
if (err) {
|
|
VERBOSE_TOROUT_STRING("rcu_torture_cbflood disabled: Bad args or OOM");
|
|
goto wait_for_stop;
|
|
}
|
|
VERBOSE_TOROUT_STRING("rcu_torture_cbflood task started");
|
|
do {
|
|
schedule_timeout_interruptible(cbflood_inter_holdoff);
|
|
atomic_long_inc(&n_cbfloods);
|
|
WARN_ON(signal_pending(current));
|
|
for (i = 0; i < cbflood_n_burst; i++) {
|
|
for (j = 0; j < cbflood_n_per_burst; j++) {
|
|
cur_ops->call(&rhp[i * cbflood_n_per_burst + j],
|
|
rcu_torture_cbflood_cb);
|
|
}
|
|
schedule_timeout_interruptible(cbflood_intra_holdoff);
|
|
WARN_ON(signal_pending(current));
|
|
}
|
|
cur_ops->cb_barrier();
|
|
stutter_wait("rcu_torture_cbflood");
|
|
} while (!torture_must_stop());
|
|
vfree(rhp);
|
|
wait_for_stop:
|
|
torture_kthread_stopping("rcu_torture_cbflood");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* RCU torture force-quiescent-state kthread. Repeatedly induces
|
|
* bursts of calls to force_quiescent_state(), increasing the probability
|
|
* of occurrence of some important types of race conditions.
|
|
*/
|
|
static int
|
|
rcu_torture_fqs(void *arg)
|
|
{
|
|
unsigned long fqs_resume_time;
|
|
int fqs_burst_remaining;
|
|
|
|
VERBOSE_TOROUT_STRING("rcu_torture_fqs task started");
|
|
do {
|
|
fqs_resume_time = jiffies + fqs_stutter * HZ;
|
|
while (ULONG_CMP_LT(jiffies, fqs_resume_time) &&
|
|
!kthread_should_stop()) {
|
|
schedule_timeout_interruptible(1);
|
|
}
|
|
fqs_burst_remaining = fqs_duration;
|
|
while (fqs_burst_remaining > 0 &&
|
|
!kthread_should_stop()) {
|
|
cur_ops->fqs();
|
|
udelay(fqs_holdoff);
|
|
fqs_burst_remaining -= fqs_holdoff;
|
|
}
|
|
stutter_wait("rcu_torture_fqs");
|
|
} while (!torture_must_stop());
|
|
torture_kthread_stopping("rcu_torture_fqs");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* RCU torture writer kthread. Repeatedly substitutes a new structure
|
|
* for that pointed to by rcu_torture_current, freeing the old structure
|
|
* after a series of grace periods (the "pipeline").
|
|
*/
|
|
static int
|
|
rcu_torture_writer(void *arg)
|
|
{
|
|
bool can_expedite = !rcu_gp_is_expedited() && !rcu_gp_is_normal();
|
|
int expediting = 0;
|
|
unsigned long gp_snap;
|
|
bool gp_cond1 = gp_cond, gp_exp1 = gp_exp, gp_normal1 = gp_normal;
|
|
bool gp_sync1 = gp_sync;
|
|
int i;
|
|
struct rcu_torture *rp;
|
|
struct rcu_torture *old_rp;
|
|
static DEFINE_TORTURE_RANDOM(rand);
|
|
int synctype[] = { RTWS_DEF_FREE, RTWS_EXP_SYNC,
|
|
RTWS_COND_GET, RTWS_SYNC };
|
|
int nsynctypes = 0;
|
|
|
|
VERBOSE_TOROUT_STRING("rcu_torture_writer task started");
|
|
if (!can_expedite)
|
|
pr_alert("%s" TORTURE_FLAG
|
|
" GP expediting controlled from boot/sysfs for %s.\n",
|
|
torture_type, cur_ops->name);
|
|
|
|
/* Initialize synctype[] array. If none set, take default. */
|
|
if (!gp_cond1 && !gp_exp1 && !gp_normal1 && !gp_sync1)
|
|
gp_cond1 = gp_exp1 = gp_normal1 = gp_sync1 = true;
|
|
if (gp_cond1 && cur_ops->get_state && cur_ops->cond_sync) {
|
|
synctype[nsynctypes++] = RTWS_COND_GET;
|
|
pr_info("%s: Testing conditional GPs.\n", __func__);
|
|
} else if (gp_cond && (!cur_ops->get_state || !cur_ops->cond_sync)) {
|
|
pr_alert("%s: gp_cond without primitives.\n", __func__);
|
|
}
|
|
if (gp_exp1 && cur_ops->exp_sync) {
|
|
synctype[nsynctypes++] = RTWS_EXP_SYNC;
|
|
pr_info("%s: Testing expedited GPs.\n", __func__);
|
|
} else if (gp_exp && !cur_ops->exp_sync) {
|
|
pr_alert("%s: gp_exp without primitives.\n", __func__);
|
|
}
|
|
if (gp_normal1 && cur_ops->deferred_free) {
|
|
synctype[nsynctypes++] = RTWS_DEF_FREE;
|
|
pr_info("%s: Testing asynchronous GPs.\n", __func__);
|
|
} else if (gp_normal && !cur_ops->deferred_free) {
|
|
pr_alert("%s: gp_normal without primitives.\n", __func__);
|
|
}
|
|
if (gp_sync1 && cur_ops->sync) {
|
|
synctype[nsynctypes++] = RTWS_SYNC;
|
|
pr_info("%s: Testing normal GPs.\n", __func__);
|
|
} else if (gp_sync && !cur_ops->sync) {
|
|
pr_alert("%s: gp_sync without primitives.\n", __func__);
|
|
}
|
|
if (WARN_ONCE(nsynctypes == 0,
|
|
"rcu_torture_writer: No update-side primitives.\n")) {
|
|
/*
|
|
* No updates primitives, so don't try updating.
|
|
* The resulting test won't be testing much, hence the
|
|
* above WARN_ONCE().
|
|
*/
|
|
rcu_torture_writer_state = RTWS_STOPPING;
|
|
torture_kthread_stopping("rcu_torture_writer");
|
|
}
|
|
|
|
do {
|
|
rcu_torture_writer_state = RTWS_FIXED_DELAY;
|
|
schedule_timeout_uninterruptible(1);
|
|
rp = rcu_torture_alloc();
|
|
if (rp == NULL)
|
|
continue;
|
|
rp->rtort_pipe_count = 0;
|
|
rcu_torture_writer_state = RTWS_DELAY;
|
|
udelay(torture_random(&rand) & 0x3ff);
|
|
rcu_torture_writer_state = RTWS_REPLACE;
|
|
old_rp = rcu_dereference_check(rcu_torture_current,
|
|
current == writer_task);
|
|
rp->rtort_mbtest = 1;
|
|
rcu_assign_pointer(rcu_torture_current, rp);
|
|
smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */
|
|
if (old_rp) {
|
|
i = old_rp->rtort_pipe_count;
|
|
if (i > RCU_TORTURE_PIPE_LEN)
|
|
i = RCU_TORTURE_PIPE_LEN;
|
|
atomic_inc(&rcu_torture_wcount[i]);
|
|
old_rp->rtort_pipe_count++;
|
|
switch (synctype[torture_random(&rand) % nsynctypes]) {
|
|
case RTWS_DEF_FREE:
|
|
rcu_torture_writer_state = RTWS_DEF_FREE;
|
|
cur_ops->deferred_free(old_rp);
|
|
break;
|
|
case RTWS_EXP_SYNC:
|
|
rcu_torture_writer_state = RTWS_EXP_SYNC;
|
|
cur_ops->exp_sync();
|
|
rcu_torture_pipe_update(old_rp);
|
|
break;
|
|
case RTWS_COND_GET:
|
|
rcu_torture_writer_state = RTWS_COND_GET;
|
|
gp_snap = cur_ops->get_state();
|
|
i = torture_random(&rand) % 16;
|
|
if (i != 0)
|
|
schedule_timeout_interruptible(i);
|
|
udelay(torture_random(&rand) % 1000);
|
|
rcu_torture_writer_state = RTWS_COND_SYNC;
|
|
cur_ops->cond_sync(gp_snap);
|
|
rcu_torture_pipe_update(old_rp);
|
|
break;
|
|
case RTWS_SYNC:
|
|
rcu_torture_writer_state = RTWS_SYNC;
|
|
cur_ops->sync();
|
|
rcu_torture_pipe_update(old_rp);
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
break;
|
|
}
|
|
}
|
|
rcutorture_record_progress(++rcu_torture_current_version);
|
|
/* Cycle through nesting levels of rcu_expedite_gp() calls. */
|
|
if (can_expedite &&
|
|
!(torture_random(&rand) & 0xff & (!!expediting - 1))) {
|
|
WARN_ON_ONCE(expediting == 0 && rcu_gp_is_expedited());
|
|
if (expediting >= 0)
|
|
rcu_expedite_gp();
|
|
else
|
|
rcu_unexpedite_gp();
|
|
if (++expediting > 3)
|
|
expediting = -expediting;
|
|
} else if (!can_expedite) { /* Disabled during boot, recheck. */
|
|
can_expedite = !rcu_gp_is_expedited() &&
|
|
!rcu_gp_is_normal();
|
|
}
|
|
rcu_torture_writer_state = RTWS_STUTTER;
|
|
stutter_wait("rcu_torture_writer");
|
|
} while (!torture_must_stop());
|
|
/* Reset expediting back to unexpedited. */
|
|
if (expediting > 0)
|
|
expediting = -expediting;
|
|
while (can_expedite && expediting++ < 0)
|
|
rcu_unexpedite_gp();
|
|
WARN_ON_ONCE(can_expedite && rcu_gp_is_expedited());
|
|
if (!can_expedite)
|
|
pr_alert("%s" TORTURE_FLAG
|
|
" Dynamic grace-period expediting was disabled.\n",
|
|
torture_type);
|
|
rcu_torture_writer_state = RTWS_STOPPING;
|
|
torture_kthread_stopping("rcu_torture_writer");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* RCU torture fake writer kthread. Repeatedly calls sync, with a random
|
|
* delay between calls.
|
|
*/
|
|
static int
|
|
rcu_torture_fakewriter(void *arg)
|
|
{
|
|
DEFINE_TORTURE_RANDOM(rand);
|
|
|
|
VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started");
|
|
set_user_nice(current, MAX_NICE);
|
|
|
|
do {
|
|
schedule_timeout_uninterruptible(1 + torture_random(&rand)%10);
|
|
udelay(torture_random(&rand) & 0x3ff);
|
|
if (cur_ops->cb_barrier != NULL &&
|
|
torture_random(&rand) % (nfakewriters * 8) == 0) {
|
|
cur_ops->cb_barrier();
|
|
} else if (gp_normal == gp_exp) {
|
|
if (cur_ops->sync && torture_random(&rand) & 0x80)
|
|
cur_ops->sync();
|
|
else if (cur_ops->exp_sync)
|
|
cur_ops->exp_sync();
|
|
} else if (gp_normal && cur_ops->sync) {
|
|
cur_ops->sync();
|
|
} else if (cur_ops->exp_sync) {
|
|
cur_ops->exp_sync();
|
|
}
|
|
stutter_wait("rcu_torture_fakewriter");
|
|
} while (!torture_must_stop());
|
|
|
|
torture_kthread_stopping("rcu_torture_fakewriter");
|
|
return 0;
|
|
}
|
|
|
|
static void rcu_torture_timer_cb(struct rcu_head *rhp)
|
|
{
|
|
kfree(rhp);
|
|
}
|
|
|
|
/*
|
|
* RCU torture reader from timer handler. Dereferences rcu_torture_current,
|
|
* incrementing the corresponding element of the pipeline array. The
|
|
* counter in the element should never be greater than 1, otherwise, the
|
|
* RCU implementation is broken.
|
|
*/
|
|
static void rcu_torture_timer(struct timer_list *unused)
|
|
{
|
|
int idx;
|
|
unsigned long started;
|
|
unsigned long completed;
|
|
static DEFINE_TORTURE_RANDOM(rand);
|
|
static DEFINE_SPINLOCK(rand_lock);
|
|
struct rcu_torture *p;
|
|
int pipe_count;
|
|
unsigned long long ts;
|
|
|
|
idx = cur_ops->readlock();
|
|
if (cur_ops->started)
|
|
started = cur_ops->started();
|
|
else
|
|
started = cur_ops->completed();
|
|
ts = rcu_trace_clock_local();
|
|
p = rcu_dereference_check(rcu_torture_current,
|
|
rcu_read_lock_bh_held() ||
|
|
rcu_read_lock_sched_held() ||
|
|
srcu_read_lock_held(srcu_ctlp) ||
|
|
torturing_tasks());
|
|
if (p == NULL) {
|
|
/* Leave because rcu_torture_writer is not yet underway */
|
|
cur_ops->readunlock(idx);
|
|
return;
|
|
}
|
|
if (p->rtort_mbtest == 0)
|
|
atomic_inc(&n_rcu_torture_mberror);
|
|
spin_lock(&rand_lock);
|
|
cur_ops->read_delay(&rand);
|
|
n_rcu_torture_timers++;
|
|
spin_unlock(&rand_lock);
|
|
preempt_disable();
|
|
pipe_count = p->rtort_pipe_count;
|
|
if (pipe_count > RCU_TORTURE_PIPE_LEN) {
|
|
/* Should not happen, but... */
|
|
pipe_count = RCU_TORTURE_PIPE_LEN;
|
|
}
|
|
completed = cur_ops->completed();
|
|
if (pipe_count > 1) {
|
|
do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts,
|
|
started, completed);
|
|
rcu_ftrace_dump(DUMP_ALL);
|
|
}
|
|
__this_cpu_inc(rcu_torture_count[pipe_count]);
|
|
completed = completed - started;
|
|
if (cur_ops->started)
|
|
completed++;
|
|
if (completed > RCU_TORTURE_PIPE_LEN) {
|
|
/* Should not happen, but... */
|
|
completed = RCU_TORTURE_PIPE_LEN;
|
|
}
|
|
__this_cpu_inc(rcu_torture_batch[completed]);
|
|
preempt_enable();
|
|
cur_ops->readunlock(idx);
|
|
|
|
/* Test call_rcu() invocation from interrupt handler. */
|
|
if (cur_ops->call) {
|
|
struct rcu_head *rhp = kmalloc(sizeof(*rhp), GFP_NOWAIT);
|
|
|
|
if (rhp)
|
|
cur_ops->call(rhp, rcu_torture_timer_cb);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* RCU torture reader kthread. Repeatedly dereferences rcu_torture_current,
|
|
* incrementing the corresponding element of the pipeline array. The
|
|
* counter in the element should never be greater than 1, otherwise, the
|
|
* RCU implementation is broken.
|
|
*/
|
|
static int
|
|
rcu_torture_reader(void *arg)
|
|
{
|
|
unsigned long started;
|
|
unsigned long completed;
|
|
int idx;
|
|
DEFINE_TORTURE_RANDOM(rand);
|
|
struct rcu_torture *p;
|
|
int pipe_count;
|
|
struct timer_list t;
|
|
unsigned long long ts;
|
|
|
|
VERBOSE_TOROUT_STRING("rcu_torture_reader task started");
|
|
set_user_nice(current, MAX_NICE);
|
|
if (irqreader && cur_ops->irq_capable)
|
|
timer_setup_on_stack(&t, rcu_torture_timer, 0);
|
|
|
|
do {
|
|
if (irqreader && cur_ops->irq_capable) {
|
|
if (!timer_pending(&t))
|
|
mod_timer(&t, jiffies + 1);
|
|
}
|
|
idx = cur_ops->readlock();
|
|
if (cur_ops->started)
|
|
started = cur_ops->started();
|
|
else
|
|
started = cur_ops->completed();
|
|
ts = rcu_trace_clock_local();
|
|
p = rcu_dereference_check(rcu_torture_current,
|
|
rcu_read_lock_bh_held() ||
|
|
rcu_read_lock_sched_held() ||
|
|
srcu_read_lock_held(srcu_ctlp) ||
|
|
torturing_tasks());
|
|
if (p == NULL) {
|
|
/* Wait for rcu_torture_writer to get underway */
|
|
cur_ops->readunlock(idx);
|
|
schedule_timeout_interruptible(HZ);
|
|
continue;
|
|
}
|
|
if (p->rtort_mbtest == 0)
|
|
atomic_inc(&n_rcu_torture_mberror);
|
|
cur_ops->read_delay(&rand);
|
|
preempt_disable();
|
|
pipe_count = p->rtort_pipe_count;
|
|
if (pipe_count > RCU_TORTURE_PIPE_LEN) {
|
|
/* Should not happen, but... */
|
|
pipe_count = RCU_TORTURE_PIPE_LEN;
|
|
}
|
|
completed = cur_ops->completed();
|
|
if (pipe_count > 1) {
|
|
do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu,
|
|
ts, started, completed);
|
|
rcu_ftrace_dump(DUMP_ALL);
|
|
}
|
|
__this_cpu_inc(rcu_torture_count[pipe_count]);
|
|
completed = completed - started;
|
|
if (cur_ops->started)
|
|
completed++;
|
|
if (completed > RCU_TORTURE_PIPE_LEN) {
|
|
/* Should not happen, but... */
|
|
completed = RCU_TORTURE_PIPE_LEN;
|
|
}
|
|
__this_cpu_inc(rcu_torture_batch[completed]);
|
|
preempt_enable();
|
|
cur_ops->readunlock(idx);
|
|
stutter_wait("rcu_torture_reader");
|
|
} while (!torture_must_stop());
|
|
if (irqreader && cur_ops->irq_capable) {
|
|
del_timer_sync(&t);
|
|
destroy_timer_on_stack(&t);
|
|
}
|
|
torture_kthread_stopping("rcu_torture_reader");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Print torture statistics. Caller must ensure that there is only
|
|
* one call to this function at a given time!!! This is normally
|
|
* accomplished by relying on the module system to only have one copy
|
|
* of the module loaded, and then by giving the rcu_torture_stats
|
|
* kthread full control (or the init/cleanup functions when rcu_torture_stats
|
|
* thread is not running).
|
|
*/
|
|
static void
|
|
rcu_torture_stats_print(void)
|
|
{
|
|
int cpu;
|
|
int i;
|
|
long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 };
|
|
long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 };
|
|
static unsigned long rtcv_snap = ULONG_MAX;
|
|
static bool splatted;
|
|
struct task_struct *wtp;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) {
|
|
pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i];
|
|
batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i];
|
|
}
|
|
}
|
|
for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) {
|
|
if (pipesummary[i] != 0)
|
|
break;
|
|
}
|
|
|
|
pr_alert("%s%s ", torture_type, TORTURE_FLAG);
|
|
pr_cont("rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ",
|
|
rcu_torture_current,
|
|
rcu_torture_current_version,
|
|
list_empty(&rcu_torture_freelist),
|
|
atomic_read(&n_rcu_torture_alloc),
|
|
atomic_read(&n_rcu_torture_alloc_fail),
|
|
atomic_read(&n_rcu_torture_free));
|
|
pr_cont("rtmbe: %d rtbe: %ld rtbke: %ld rtbre: %ld ",
|
|
atomic_read(&n_rcu_torture_mberror),
|
|
n_rcu_torture_barrier_error,
|
|
n_rcu_torture_boost_ktrerror,
|
|
n_rcu_torture_boost_rterror);
|
|
pr_cont("rtbf: %ld rtb: %ld nt: %ld ",
|
|
n_rcu_torture_boost_failure,
|
|
n_rcu_torture_boosts,
|
|
n_rcu_torture_timers);
|
|
torture_onoff_stats();
|
|
pr_cont("barrier: %ld/%ld:%ld ",
|
|
n_barrier_successes,
|
|
n_barrier_attempts,
|
|
n_rcu_torture_barrier_error);
|
|
pr_cont("cbflood: %ld\n", atomic_long_read(&n_cbfloods));
|
|
|
|
pr_alert("%s%s ", torture_type, TORTURE_FLAG);
|
|
if (atomic_read(&n_rcu_torture_mberror) != 0 ||
|
|
n_rcu_torture_barrier_error != 0 ||
|
|
n_rcu_torture_boost_ktrerror != 0 ||
|
|
n_rcu_torture_boost_rterror != 0 ||
|
|
n_rcu_torture_boost_failure != 0 ||
|
|
i > 1) {
|
|
pr_cont("%s", "!!! ");
|
|
atomic_inc(&n_rcu_torture_error);
|
|
WARN_ON_ONCE(1);
|
|
}
|
|
pr_cont("Reader Pipe: ");
|
|
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++)
|
|
pr_cont(" %ld", pipesummary[i]);
|
|
pr_cont("\n");
|
|
|
|
pr_alert("%s%s ", torture_type, TORTURE_FLAG);
|
|
pr_cont("Reader Batch: ");
|
|
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++)
|
|
pr_cont(" %ld", batchsummary[i]);
|
|
pr_cont("\n");
|
|
|
|
pr_alert("%s%s ", torture_type, TORTURE_FLAG);
|
|
pr_cont("Free-Block Circulation: ");
|
|
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) {
|
|
pr_cont(" %d", atomic_read(&rcu_torture_wcount[i]));
|
|
}
|
|
pr_cont("\n");
|
|
|
|
if (cur_ops->stats)
|
|
cur_ops->stats();
|
|
if (rtcv_snap == rcu_torture_current_version &&
|
|
rcu_torture_current != NULL) {
|
|
int __maybe_unused flags = 0;
|
|
unsigned long __maybe_unused gpnum = 0;
|
|
unsigned long __maybe_unused completed = 0;
|
|
|
|
rcutorture_get_gp_data(cur_ops->ttype,
|
|
&flags, &gpnum, &completed);
|
|
srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp,
|
|
&flags, &gpnum, &completed);
|
|
wtp = READ_ONCE(writer_task);
|
|
pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x ->state %#lx cpu %d\n",
|
|
rcu_torture_writer_state_getname(),
|
|
rcu_torture_writer_state,
|
|
gpnum, completed, flags,
|
|
wtp == NULL ? ~0UL : wtp->state,
|
|
wtp == NULL ? -1 : (int)task_cpu(wtp));
|
|
if (!splatted && wtp) {
|
|
sched_show_task(wtp);
|
|
splatted = true;
|
|
}
|
|
show_rcu_gp_kthreads();
|
|
rcu_ftrace_dump(DUMP_ALL);
|
|
}
|
|
rtcv_snap = rcu_torture_current_version;
|
|
}
|
|
|
|
/*
|
|
* Periodically prints torture statistics, if periodic statistics printing
|
|
* was specified via the stat_interval module parameter.
|
|
*/
|
|
static int
|
|
rcu_torture_stats(void *arg)
|
|
{
|
|
VERBOSE_TOROUT_STRING("rcu_torture_stats task started");
|
|
do {
|
|
schedule_timeout_interruptible(stat_interval * HZ);
|
|
rcu_torture_stats_print();
|
|
torture_shutdown_absorb("rcu_torture_stats");
|
|
} while (!torture_must_stop());
|
|
torture_kthread_stopping("rcu_torture_stats");
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag)
|
|
{
|
|
pr_alert("%s" TORTURE_FLAG
|
|
"--- %s: nreaders=%d nfakewriters=%d "
|
|
"stat_interval=%d verbose=%d test_no_idle_hz=%d "
|
|
"shuffle_interval=%d stutter=%d irqreader=%d "
|
|
"fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d "
|
|
"test_boost=%d/%d test_boost_interval=%d "
|
|
"test_boost_duration=%d shutdown_secs=%d "
|
|
"stall_cpu=%d stall_cpu_holdoff=%d stall_cpu_irqsoff=%d "
|
|
"n_barrier_cbs=%d "
|
|
"onoff_interval=%d onoff_holdoff=%d\n",
|
|
torture_type, tag, nrealreaders, nfakewriters,
|
|
stat_interval, verbose, test_no_idle_hz, shuffle_interval,
|
|
stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter,
|
|
test_boost, cur_ops->can_boost,
|
|
test_boost_interval, test_boost_duration, shutdown_secs,
|
|
stall_cpu, stall_cpu_holdoff, stall_cpu_irqsoff,
|
|
n_barrier_cbs,
|
|
onoff_interval, onoff_holdoff);
|
|
}
|
|
|
|
static int rcutorture_booster_cleanup(unsigned int cpu)
|
|
{
|
|
struct task_struct *t;
|
|
|
|
if (boost_tasks[cpu] == NULL)
|
|
return 0;
|
|
mutex_lock(&boost_mutex);
|
|
t = boost_tasks[cpu];
|
|
boost_tasks[cpu] = NULL;
|
|
mutex_unlock(&boost_mutex);
|
|
|
|
/* This must be outside of the mutex, otherwise deadlock! */
|
|
torture_stop_kthread(rcu_torture_boost, t);
|
|
return 0;
|
|
}
|
|
|
|
static int rcutorture_booster_init(unsigned int cpu)
|
|
{
|
|
int retval;
|
|
|
|
if (boost_tasks[cpu] != NULL)
|
|
return 0; /* Already created, nothing more to do. */
|
|
|
|
/* Don't allow time recalculation while creating a new task. */
|
|
mutex_lock(&boost_mutex);
|
|
VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task");
|
|
boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL,
|
|
cpu_to_node(cpu),
|
|
"rcu_torture_boost");
|
|
if (IS_ERR(boost_tasks[cpu])) {
|
|
retval = PTR_ERR(boost_tasks[cpu]);
|
|
VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed");
|
|
n_rcu_torture_boost_ktrerror++;
|
|
boost_tasks[cpu] = NULL;
|
|
mutex_unlock(&boost_mutex);
|
|
return retval;
|
|
}
|
|
kthread_bind(boost_tasks[cpu], cpu);
|
|
wake_up_process(boost_tasks[cpu]);
|
|
mutex_unlock(&boost_mutex);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then
|
|
* induces a CPU stall for the time specified by stall_cpu.
|
|
*/
|
|
static int rcu_torture_stall(void *args)
|
|
{
|
|
unsigned long stop_at;
|
|
|
|
VERBOSE_TOROUT_STRING("rcu_torture_stall task started");
|
|
if (stall_cpu_holdoff > 0) {
|
|
VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff");
|
|
schedule_timeout_interruptible(stall_cpu_holdoff * HZ);
|
|
VERBOSE_TOROUT_STRING("rcu_torture_stall end holdoff");
|
|
}
|
|
if (!kthread_should_stop()) {
|
|
stop_at = get_seconds() + stall_cpu;
|
|
/* RCU CPU stall is expected behavior in following code. */
|
|
rcu_read_lock();
|
|
if (stall_cpu_irqsoff)
|
|
local_irq_disable();
|
|
else
|
|
preempt_disable();
|
|
pr_alert("rcu_torture_stall start on CPU %d.\n",
|
|
smp_processor_id());
|
|
while (ULONG_CMP_LT(get_seconds(), stop_at))
|
|
continue; /* Induce RCU CPU stall warning. */
|
|
if (stall_cpu_irqsoff)
|
|
local_irq_enable();
|
|
else
|
|
preempt_enable();
|
|
rcu_read_unlock();
|
|
pr_alert("rcu_torture_stall end.\n");
|
|
}
|
|
torture_shutdown_absorb("rcu_torture_stall");
|
|
while (!kthread_should_stop())
|
|
schedule_timeout_interruptible(10 * HZ);
|
|
return 0;
|
|
}
|
|
|
|
/* Spawn CPU-stall kthread, if stall_cpu specified. */
|
|
static int __init rcu_torture_stall_init(void)
|
|
{
|
|
if (stall_cpu <= 0)
|
|
return 0;
|
|
return torture_create_kthread(rcu_torture_stall, NULL, stall_task);
|
|
}
|
|
|
|
/* Callback function for RCU barrier testing. */
|
|
static void rcu_torture_barrier_cbf(struct rcu_head *rcu)
|
|
{
|
|
atomic_inc(&barrier_cbs_invoked);
|
|
}
|
|
|
|
/* kthread function to register callbacks used to test RCU barriers. */
|
|
static int rcu_torture_barrier_cbs(void *arg)
|
|
{
|
|
long myid = (long)arg;
|
|
bool lastphase = 0;
|
|
bool newphase;
|
|
struct rcu_head rcu;
|
|
|
|
init_rcu_head_on_stack(&rcu);
|
|
VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task started");
|
|
set_user_nice(current, MAX_NICE);
|
|
do {
|
|
wait_event(barrier_cbs_wq[myid],
|
|
(newphase =
|
|
smp_load_acquire(&barrier_phase)) != lastphase ||
|
|
torture_must_stop());
|
|
lastphase = newphase;
|
|
if (torture_must_stop())
|
|
break;
|
|
/*
|
|
* The above smp_load_acquire() ensures barrier_phase load
|
|
* is ordered before the following ->call().
|
|
*/
|
|
local_irq_disable(); /* Just to test no-irq call_rcu(). */
|
|
cur_ops->call(&rcu, rcu_torture_barrier_cbf);
|
|
local_irq_enable();
|
|
if (atomic_dec_and_test(&barrier_cbs_count))
|
|
wake_up(&barrier_wq);
|
|
} while (!torture_must_stop());
|
|
if (cur_ops->cb_barrier != NULL)
|
|
cur_ops->cb_barrier();
|
|
destroy_rcu_head_on_stack(&rcu);
|
|
torture_kthread_stopping("rcu_torture_barrier_cbs");
|
|
return 0;
|
|
}
|
|
|
|
/* kthread function to drive and coordinate RCU barrier testing. */
|
|
static int rcu_torture_barrier(void *arg)
|
|
{
|
|
int i;
|
|
|
|
VERBOSE_TOROUT_STRING("rcu_torture_barrier task starting");
|
|
do {
|
|
atomic_set(&barrier_cbs_invoked, 0);
|
|
atomic_set(&barrier_cbs_count, n_barrier_cbs);
|
|
/* Ensure barrier_phase ordered after prior assignments. */
|
|
smp_store_release(&barrier_phase, !barrier_phase);
|
|
for (i = 0; i < n_barrier_cbs; i++)
|
|
wake_up(&barrier_cbs_wq[i]);
|
|
wait_event(barrier_wq,
|
|
atomic_read(&barrier_cbs_count) == 0 ||
|
|
torture_must_stop());
|
|
if (torture_must_stop())
|
|
break;
|
|
n_barrier_attempts++;
|
|
cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */
|
|
if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) {
|
|
n_rcu_torture_barrier_error++;
|
|
pr_err("barrier_cbs_invoked = %d, n_barrier_cbs = %d\n",
|
|
atomic_read(&barrier_cbs_invoked),
|
|
n_barrier_cbs);
|
|
WARN_ON_ONCE(1);
|
|
}
|
|
n_barrier_successes++;
|
|
schedule_timeout_interruptible(HZ / 10);
|
|
} while (!torture_must_stop());
|
|
torture_kthread_stopping("rcu_torture_barrier");
|
|
return 0;
|
|
}
|
|
|
|
/* Initialize RCU barrier testing. */
|
|
static int rcu_torture_barrier_init(void)
|
|
{
|
|
int i;
|
|
int ret;
|
|
|
|
if (n_barrier_cbs <= 0)
|
|
return 0;
|
|
if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) {
|
|
pr_alert("%s" TORTURE_FLAG
|
|
" Call or barrier ops missing for %s,\n",
|
|
torture_type, cur_ops->name);
|
|
pr_alert("%s" TORTURE_FLAG
|
|
" RCU barrier testing omitted from run.\n",
|
|
torture_type);
|
|
return 0;
|
|
}
|
|
atomic_set(&barrier_cbs_count, 0);
|
|
atomic_set(&barrier_cbs_invoked, 0);
|
|
barrier_cbs_tasks =
|
|
kcalloc(n_barrier_cbs, sizeof(barrier_cbs_tasks[0]),
|
|
GFP_KERNEL);
|
|
barrier_cbs_wq =
|
|
kcalloc(n_barrier_cbs, sizeof(barrier_cbs_wq[0]), GFP_KERNEL);
|
|
if (barrier_cbs_tasks == NULL || !barrier_cbs_wq)
|
|
return -ENOMEM;
|
|
for (i = 0; i < n_barrier_cbs; i++) {
|
|
init_waitqueue_head(&barrier_cbs_wq[i]);
|
|
ret = torture_create_kthread(rcu_torture_barrier_cbs,
|
|
(void *)(long)i,
|
|
barrier_cbs_tasks[i]);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
return torture_create_kthread(rcu_torture_barrier, NULL, barrier_task);
|
|
}
|
|
|
|
/* Clean up after RCU barrier testing. */
|
|
static void rcu_torture_barrier_cleanup(void)
|
|
{
|
|
int i;
|
|
|
|
torture_stop_kthread(rcu_torture_barrier, barrier_task);
|
|
if (barrier_cbs_tasks != NULL) {
|
|
for (i = 0; i < n_barrier_cbs; i++)
|
|
torture_stop_kthread(rcu_torture_barrier_cbs,
|
|
barrier_cbs_tasks[i]);
|
|
kfree(barrier_cbs_tasks);
|
|
barrier_cbs_tasks = NULL;
|
|
}
|
|
if (barrier_cbs_wq != NULL) {
|
|
kfree(barrier_cbs_wq);
|
|
barrier_cbs_wq = NULL;
|
|
}
|
|
}
|
|
|
|
static enum cpuhp_state rcutor_hp;
|
|
|
|
static void
|
|
rcu_torture_cleanup(void)
|
|
{
|
|
int flags = 0;
|
|
unsigned long gpnum = 0;
|
|
unsigned long completed = 0;
|
|
int i;
|
|
|
|
rcutorture_record_test_transition();
|
|
if (torture_cleanup_begin()) {
|
|
if (cur_ops->cb_barrier != NULL)
|
|
cur_ops->cb_barrier();
|
|
return;
|
|
}
|
|
|
|
rcu_torture_barrier_cleanup();
|
|
torture_stop_kthread(rcu_torture_stall, stall_task);
|
|
torture_stop_kthread(rcu_torture_writer, writer_task);
|
|
|
|
if (reader_tasks) {
|
|
for (i = 0; i < nrealreaders; i++)
|
|
torture_stop_kthread(rcu_torture_reader,
|
|
reader_tasks[i]);
|
|
kfree(reader_tasks);
|
|
}
|
|
rcu_torture_current = NULL;
|
|
|
|
if (fakewriter_tasks) {
|
|
for (i = 0; i < nfakewriters; i++) {
|
|
torture_stop_kthread(rcu_torture_fakewriter,
|
|
fakewriter_tasks[i]);
|
|
}
|
|
kfree(fakewriter_tasks);
|
|
fakewriter_tasks = NULL;
|
|
}
|
|
|
|
rcutorture_get_gp_data(cur_ops->ttype, &flags, &gpnum, &completed);
|
|
srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp,
|
|
&flags, &gpnum, &completed);
|
|
pr_alert("%s: End-test grace-period state: g%lu c%lu f%#x\n",
|
|
cur_ops->name, gpnum, completed, flags);
|
|
torture_stop_kthread(rcu_torture_stats, stats_task);
|
|
torture_stop_kthread(rcu_torture_fqs, fqs_task);
|
|
for (i = 0; i < ncbflooders; i++)
|
|
torture_stop_kthread(rcu_torture_cbflood, cbflood_task[i]);
|
|
if ((test_boost == 1 && cur_ops->can_boost) ||
|
|
test_boost == 2)
|
|
cpuhp_remove_state(rcutor_hp);
|
|
|
|
/*
|
|
* Wait for all RCU callbacks to fire, then do flavor-specific
|
|
* cleanup operations.
|
|
*/
|
|
if (cur_ops->cb_barrier != NULL)
|
|
cur_ops->cb_barrier();
|
|
if (cur_ops->cleanup != NULL)
|
|
cur_ops->cleanup();
|
|
|
|
rcu_torture_stats_print(); /* -After- the stats thread is stopped! */
|
|
|
|
if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error)
|
|
rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE");
|
|
else if (torture_onoff_failures())
|
|
rcu_torture_print_module_parms(cur_ops,
|
|
"End of test: RCU_HOTPLUG");
|
|
else
|
|
rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS");
|
|
torture_cleanup_end();
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
|
|
static void rcu_torture_leak_cb(struct rcu_head *rhp)
|
|
{
|
|
}
|
|
|
|
static void rcu_torture_err_cb(struct rcu_head *rhp)
|
|
{
|
|
/*
|
|
* This -might- happen due to race conditions, but is unlikely.
|
|
* The scenario that leads to this happening is that the
|
|
* first of the pair of duplicate callbacks is queued,
|
|
* someone else starts a grace period that includes that
|
|
* callback, then the second of the pair must wait for the
|
|
* next grace period. Unlikely, but can happen. If it
|
|
* does happen, the debug-objects subsystem won't have splatted.
|
|
*/
|
|
pr_alert("%s: duplicated callback was invoked.\n", KBUILD_MODNAME);
|
|
}
|
|
#endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */
|
|
|
|
/*
|
|
* Verify that double-free causes debug-objects to complain, but only
|
|
* if CONFIG_DEBUG_OBJECTS_RCU_HEAD=y. Otherwise, say that the test
|
|
* cannot be carried out.
|
|
*/
|
|
static void rcu_test_debug_objects(void)
|
|
{
|
|
#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
|
|
struct rcu_head rh1;
|
|
struct rcu_head rh2;
|
|
|
|
init_rcu_head_on_stack(&rh1);
|
|
init_rcu_head_on_stack(&rh2);
|
|
pr_alert("%s: WARN: Duplicate call_rcu() test starting.\n", KBUILD_MODNAME);
|
|
|
|
/* Try to queue the rh2 pair of callbacks for the same grace period. */
|
|
preempt_disable(); /* Prevent preemption from interrupting test. */
|
|
rcu_read_lock(); /* Make it impossible to finish a grace period. */
|
|
call_rcu(&rh1, rcu_torture_leak_cb); /* Start grace period. */
|
|
local_irq_disable(); /* Make it harder to start a new grace period. */
|
|
call_rcu(&rh2, rcu_torture_leak_cb);
|
|
call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */
|
|
local_irq_enable();
|
|
rcu_read_unlock();
|
|
preempt_enable();
|
|
|
|
/* Wait for them all to get done so we can safely return. */
|
|
rcu_barrier();
|
|
pr_alert("%s: WARN: Duplicate call_rcu() test complete.\n", KBUILD_MODNAME);
|
|
destroy_rcu_head_on_stack(&rh1);
|
|
destroy_rcu_head_on_stack(&rh2);
|
|
#else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */
|
|
pr_alert("%s: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n", KBUILD_MODNAME);
|
|
#endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */
|
|
}
|
|
|
|
static int __init
|
|
rcu_torture_init(void)
|
|
{
|
|
int i;
|
|
int cpu;
|
|
int firsterr = 0;
|
|
static struct rcu_torture_ops *torture_ops[] = {
|
|
&rcu_ops, &rcu_bh_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops,
|
|
&sched_ops, &tasks_ops,
|
|
};
|
|
|
|
if (!torture_init_begin(torture_type, verbose))
|
|
return -EBUSY;
|
|
|
|
/* Process args and tell the world that the torturer is on the job. */
|
|
for (i = 0; i < ARRAY_SIZE(torture_ops); i++) {
|
|
cur_ops = torture_ops[i];
|
|
if (strcmp(torture_type, cur_ops->name) == 0)
|
|
break;
|
|
}
|
|
if (i == ARRAY_SIZE(torture_ops)) {
|
|
pr_alert("rcu-torture: invalid torture type: \"%s\"\n",
|
|
torture_type);
|
|
pr_alert("rcu-torture types:");
|
|
for (i = 0; i < ARRAY_SIZE(torture_ops); i++)
|
|
pr_alert(" %s", torture_ops[i]->name);
|
|
pr_alert("\n");
|
|
firsterr = -EINVAL;
|
|
goto unwind;
|
|
}
|
|
if (cur_ops->fqs == NULL && fqs_duration != 0) {
|
|
pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n");
|
|
fqs_duration = 0;
|
|
}
|
|
if (cur_ops->init)
|
|
cur_ops->init();
|
|
|
|
if (nreaders >= 0) {
|
|
nrealreaders = nreaders;
|
|
} else {
|
|
nrealreaders = num_online_cpus() - 2 - nreaders;
|
|
if (nrealreaders <= 0)
|
|
nrealreaders = 1;
|
|
}
|
|
rcu_torture_print_module_parms(cur_ops, "Start of test");
|
|
|
|
/* Set up the freelist. */
|
|
|
|
INIT_LIST_HEAD(&rcu_torture_freelist);
|
|
for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) {
|
|
rcu_tortures[i].rtort_mbtest = 0;
|
|
list_add_tail(&rcu_tortures[i].rtort_free,
|
|
&rcu_torture_freelist);
|
|
}
|
|
|
|
/* Initialize the statistics so that each run gets its own numbers. */
|
|
|
|
rcu_torture_current = NULL;
|
|
rcu_torture_current_version = 0;
|
|
atomic_set(&n_rcu_torture_alloc, 0);
|
|
atomic_set(&n_rcu_torture_alloc_fail, 0);
|
|
atomic_set(&n_rcu_torture_free, 0);
|
|
atomic_set(&n_rcu_torture_mberror, 0);
|
|
atomic_set(&n_rcu_torture_error, 0);
|
|
n_rcu_torture_barrier_error = 0;
|
|
n_rcu_torture_boost_ktrerror = 0;
|
|
n_rcu_torture_boost_rterror = 0;
|
|
n_rcu_torture_boost_failure = 0;
|
|
n_rcu_torture_boosts = 0;
|
|
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++)
|
|
atomic_set(&rcu_torture_wcount[i], 0);
|
|
for_each_possible_cpu(cpu) {
|
|
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) {
|
|
per_cpu(rcu_torture_count, cpu)[i] = 0;
|
|
per_cpu(rcu_torture_batch, cpu)[i] = 0;
|
|
}
|
|
}
|
|
|
|
/* Start up the kthreads. */
|
|
|
|
firsterr = torture_create_kthread(rcu_torture_writer, NULL,
|
|
writer_task);
|
|
if (firsterr)
|
|
goto unwind;
|
|
if (nfakewriters > 0) {
|
|
fakewriter_tasks = kcalloc(nfakewriters,
|
|
sizeof(fakewriter_tasks[0]),
|
|
GFP_KERNEL);
|
|
if (fakewriter_tasks == NULL) {
|
|
VERBOSE_TOROUT_ERRSTRING("out of memory");
|
|
firsterr = -ENOMEM;
|
|
goto unwind;
|
|
}
|
|
}
|
|
for (i = 0; i < nfakewriters; i++) {
|
|
firsterr = torture_create_kthread(rcu_torture_fakewriter,
|
|
NULL, fakewriter_tasks[i]);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
reader_tasks = kcalloc(nrealreaders, sizeof(reader_tasks[0]),
|
|
GFP_KERNEL);
|
|
if (reader_tasks == NULL) {
|
|
VERBOSE_TOROUT_ERRSTRING("out of memory");
|
|
firsterr = -ENOMEM;
|
|
goto unwind;
|
|
}
|
|
for (i = 0; i < nrealreaders; i++) {
|
|
firsterr = torture_create_kthread(rcu_torture_reader, NULL,
|
|
reader_tasks[i]);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
if (stat_interval > 0) {
|
|
firsterr = torture_create_kthread(rcu_torture_stats, NULL,
|
|
stats_task);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
if (test_no_idle_hz && shuffle_interval > 0) {
|
|
firsterr = torture_shuffle_init(shuffle_interval * HZ);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
if (stutter < 0)
|
|
stutter = 0;
|
|
if (stutter) {
|
|
firsterr = torture_stutter_init(stutter * HZ);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
if (fqs_duration < 0)
|
|
fqs_duration = 0;
|
|
if (fqs_duration) {
|
|
/* Create the fqs thread */
|
|
firsterr = torture_create_kthread(rcu_torture_fqs, NULL,
|
|
fqs_task);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
if (test_boost_interval < 1)
|
|
test_boost_interval = 1;
|
|
if (test_boost_duration < 2)
|
|
test_boost_duration = 2;
|
|
if ((test_boost == 1 && cur_ops->can_boost) ||
|
|
test_boost == 2) {
|
|
|
|
boost_starttime = jiffies + test_boost_interval * HZ;
|
|
|
|
firsterr = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "RCU_TORTURE",
|
|
rcutorture_booster_init,
|
|
rcutorture_booster_cleanup);
|
|
if (firsterr < 0)
|
|
goto unwind;
|
|
rcutor_hp = firsterr;
|
|
}
|
|
firsterr = torture_shutdown_init(shutdown_secs, rcu_torture_cleanup);
|
|
if (firsterr)
|
|
goto unwind;
|
|
firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval * HZ);
|
|
if (firsterr)
|
|
goto unwind;
|
|
firsterr = rcu_torture_stall_init();
|
|
if (firsterr)
|
|
goto unwind;
|
|
firsterr = rcu_torture_barrier_init();
|
|
if (firsterr)
|
|
goto unwind;
|
|
if (object_debug)
|
|
rcu_test_debug_objects();
|
|
if (cbflood_n_burst > 0) {
|
|
/* Create the cbflood threads */
|
|
ncbflooders = (num_online_cpus() + 3) / 4;
|
|
cbflood_task = kcalloc(ncbflooders, sizeof(*cbflood_task),
|
|
GFP_KERNEL);
|
|
if (!cbflood_task) {
|
|
VERBOSE_TOROUT_ERRSTRING("out of memory");
|
|
firsterr = -ENOMEM;
|
|
goto unwind;
|
|
}
|
|
for (i = 0; i < ncbflooders; i++) {
|
|
firsterr = torture_create_kthread(rcu_torture_cbflood,
|
|
NULL,
|
|
cbflood_task[i]);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
}
|
|
rcutorture_record_test_transition();
|
|
torture_init_end();
|
|
return 0;
|
|
|
|
unwind:
|
|
torture_init_end();
|
|
rcu_torture_cleanup();
|
|
return firsterr;
|
|
}
|
|
|
|
module_init(rcu_torture_init);
|
|
module_exit(rcu_torture_cleanup);
|