#define pr_fmt(fmt) fmt
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/err.h>
#include <linux/spinlock.h>
#include <linux/smp.h>
#include <linux/rcupdate_wait.h>
#include <linux/rcu_notifier.h>
#include <linux/interrupt.h>
#include <linux/sched/signal.h>
#include <uapi/linux/sched/types.h>
#include <linux/atomic.h>
#include <linux/bitops.h>
#include <linux/completion.h>
#include <linux/moduleparam.h>
#include <linux/percpu.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/freezer.h>
#include <linux/cpu.h>
#include <linux/delay.h>
#include <linux/stat.h>
#include <linux/srcu.h>
#include <linux/slab.h>
#include <linux/trace_clock.h>
#include <asm/byteorder.h>
#include <linux/torture.h>
#include <linux/vmalloc.h>
#include <linux/sched/debug.h>
#include <linux/sched/sysctl.h>
#include <linux/oom.h>
#include <linux/tick.h>
#include <linux/rcupdate_trace.h>
#include <linux/nmi.h>
#include "rcu.h"
MODULE_DESCRIPTION("Read-Copy Update module-based torture test facility");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.ibm.com> and Josh Triplett <josh@joshtriplett.org>");
#define RCUTORTURE_RDR_SHIFT_1 8
#define RCUTORTURE_RDR_MASK_1 (0xff << RCUTORTURE_RDR_SHIFT_1)
#define RCUTORTURE_RDR_SHIFT_2 16
#define RCUTORTURE_RDR_MASK_2 (0xff << RCUTORTURE_RDR_SHIFT_2)
#define RCUTORTURE_RDR_BH 0x01
#define RCUTORTURE_RDR_IRQ 0x02
#define RCUTORTURE_RDR_PREEMPT 0x04
#define RCUTORTURE_RDR_RBH 0x08
#define RCUTORTURE_RDR_SCHED 0x10
#define RCUTORTURE_RDR_RCU_1 0x20
#define RCUTORTURE_RDR_RCU_2 0x40
#define RCUTORTURE_RDR_UPDOWN 0x80
#define RCUTORTURE_RDR_NBITS 8
#define RCUTORTURE_MAX_EXTEND \
(RCUTORTURE_RDR_BH | RCUTORTURE_RDR_IRQ | RCUTORTURE_RDR_PREEMPT | \
RCUTORTURE_RDR_RBH | RCUTORTURE_RDR_SCHED)
#define RCUTORTURE_RDR_ALLBITS \
(RCUTORTURE_MAX_EXTEND | RCUTORTURE_RDR_RCU_1 | RCUTORTURE_RDR_RCU_2 | \
RCUTORTURE_RDR_MASK_1 | RCUTORTURE_RDR_MASK_2)
#define RCUTORTURE_RDR_MAX_LOOPS 0x7
#define RCUTORTURE_RDR_MAX_SEGS (RCUTORTURE_RDR_MAX_LOOPS + 3)
torture_param(int, extendables, RCUTORTURE_MAX_EXTEND,
"Extend readers by disabling bh (1), irqs (2), or preempt (4)");
torture_param(int, fqs_duration, 0, "Duration of fqs bursts (us), 0 to disable");
torture_param(int, fqs_holdoff, 0, "Holdoff time within fqs bursts (us)");
torture_param(int, fqs_stutter, 3, "Wait time between fqs bursts (s)");
torture_param(int, fwd_progress, 1, "Number of grace-period forward progress tasks (0 to disable)");
torture_param(int, fwd_progress_div, 4, "Fraction of CPU stall to wait");
torture_param(int, fwd_progress_holdoff, 60, "Time between forward-progress tests (s)");
torture_param(bool, fwd_progress_need_resched, 1, "Hide cond_resched() behind need_resched()");
torture_param(bool, gp_cond, false, "Use conditional/async GP wait primitives");
torture_param(bool, gp_cond_exp, false, "Use conditional/async expedited GP wait primitives");
torture_param(bool, gp_cond_full, false, "Use conditional/async full-state GP wait primitives");
torture_param(bool, gp_cond_exp_full, false,
"Use conditional/async full-stateexpedited GP wait primitives");
torture_param(int, gp_cond_wi, 16 * USEC_PER_SEC / HZ,
"Wait interval for normal conditional grace periods, us (default 16 jiffies)");
torture_param(int, gp_cond_wi_exp, 128,
"Wait interval for expedited conditional grace periods, us (default 128 us)");
torture_param(bool, gp_exp, false, "Use expedited GP wait primitives");
torture_param(bool, gp_normal, false, "Use normal (non-expedited) GP wait primitives");
torture_param(bool, gp_poll, false, "Use polling GP wait primitives");
torture_param(bool, gp_poll_exp, false, "Use polling expedited GP wait primitives");
torture_param(bool, gp_poll_full, false, "Use polling full-state GP wait primitives");
torture_param(bool, gp_poll_exp_full, false, "Use polling full-state expedited GP wait primitives");
torture_param(int, gp_poll_wi, 16 * USEC_PER_SEC / HZ,
"Wait interval for normal polled grace periods, us (default 16 jiffies)");
torture_param(int, gp_poll_wi_exp, 128,
"Wait interval for expedited polled grace periods, us (default 128 us)");
torture_param(bool, gp_sync, false, "Use synchronous GP wait primitives");
torture_param(int, irqreader, 1, "Allow RCU readers from irq handlers");
torture_param(int, leakpointer, 0, "Leak pointer dereferences from readers");
torture_param(int, n_barrier_cbs, 0, "# of callbacks/kthreads for barrier testing");
torture_param(int, n_up_down, 32, "# of concurrent up/down hrtimer-based RCU readers");
torture_param(int, nfakewriters, 4, "Number of RCU fake writer threads");
torture_param(int, nreaders, -1, "Number of RCU reader threads");
torture_param(int, object_debug, 0, "Enable debug-object double call_rcu() testing");
torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)");
torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (jiffies), 0=disable");
torture_param(bool, gpwrap_lag, true, "Enable grace-period wrap lag testing");
torture_param(int, gpwrap_lag_gps, 8, "Value to set for set_gpwrap_lag during an active testing period.");
torture_param(int, gpwrap_lag_cycle_mins, 30, "Total cycle duration for gpwrap lag testing (in minutes)");
torture_param(int, gpwrap_lag_active_mins, 5, "Duration for which gpwrap lag is active within each cycle (in minutes)");
torture_param(int, nocbs_nthreads, 0, "Number of NOCB toggle threads, 0 to disable");
torture_param(int, nocbs_toggle, 1000, "Time between toggling nocb state (ms)");
torture_param(int, preempt_duration, 0, "Preemption duration (ms), zero to disable");
torture_param(int, preempt_interval, MSEC_PER_SEC, "Interval between preemptions (ms)");
torture_param(int, read_exit_delay, 13, "Delay between read-then-exit episodes (s)");
torture_param(int, read_exit_burst, 16, "# of read-then-exit bursts per episode, zero to disable");
torture_param(int, reader_flavor, SRCU_READ_FLAVOR_NORMAL, "Reader flavors to use, one per bit.");
torture_param(int, shuffle_interval, 3, "Number of seconds between shuffles");
torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable.");
torture_param(int, stall_cpu, 0, "Stall duration (s), zero to disable.");
torture_param(int, stall_cpu_holdoff, 10, "Time to wait before starting stall (s).");
torture_param(bool, stall_no_softlockup, false, "Avoid softlockup warning during cpu stall.");
torture_param(int, stall_cpu_irqsoff, 0, "Disable interrupts while stalling.");
torture_param(int, stall_cpu_block, 0, "Sleep while stalling.");
torture_param(int, stall_cpu_repeat, 0, "Number of additional stalls after the first one.");
torture_param(int, stall_gp_kthread, 0, "Grace-period kthread stall duration (s).");
torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s");
torture_param(int, stutter, 5, "Number of seconds to run/halt test");
torture_param(int, test_boost, 1, "Test RCU prio boost: 0=no, 1=maybe, 2=yes.");
torture_param(int, test_boost_duration, 4, "Duration of each boost test, seconds.");
torture_param(int, test_boost_holdoff, 0, "Holdoff time from rcutorture start, seconds.");
torture_param(int, test_boost_interval, 7, "Interval between boost tests, seconds.");
torture_param(int, test_nmis, 0, "End-test NMI tests, 0 to disable.");
torture_param(bool, test_no_idle_hz, true, "Test support for tickless idle CPUs");
torture_param(int, test_srcu_lockdep, 0, "Test specified SRCU deadlock scenario.");
torture_param(int, verbose, 1, "Enable verbose debugging printk()s");
static char *torture_type = "rcu";
module_param(torture_type, charp, 0444);
MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, srcu, ...)");
static int nrealnocbers;
static int nrealreaders;
static int nrealfakewriters;
static struct task_struct *writer_task;
static struct task_struct **fakewriter_tasks;
static struct task_struct **reader_tasks;
static struct task_struct *updown_task;
static struct task_struct **nocb_tasks;
static struct task_struct *stats_task;
static struct task_struct *fqs_task;
static struct task_struct *boost_tasks[NR_CPUS];
static struct task_struct *stall_task;
static struct task_struct **fwd_prog_tasks;
static struct task_struct **barrier_cbs_tasks;
static struct task_struct *barrier_task;
static struct task_struct *read_exit_task;
static struct task_struct *preempt_task;
#define RCU_TORTURE_PIPE_LEN 10
struct rcu_torture_reader_check {
unsigned long rtc_myloops;
int rtc_chkrdr;
unsigned long rtc_chkloops;
int rtc_ready;
struct rcu_torture_reader_check *rtc_assigner;
} ____cacheline_internodealigned_in_smp;
struct rcu_torture {
struct rcu_head rtort_rcu;
int rtort_pipe_count;
struct list_head rtort_free;
int rtort_mbtest;
struct rcu_torture_reader_check *rtort_chkp;
};
static LIST_HEAD(rcu_torture_freelist);
static struct rcu_torture __rcu *rcu_torture_current;
static unsigned long rcu_torture_current_version;
static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN];
static DEFINE_SPINLOCK(rcu_torture_lock);
static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count);
static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch);
static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1];
static struct rcu_torture_reader_check *rcu_torture_reader_mbchk;
static atomic_t n_rcu_torture_alloc;
static atomic_t n_rcu_torture_alloc_fail;
static atomic_t n_rcu_torture_free;
static atomic_t n_rcu_torture_mberror;
static atomic_t n_rcu_torture_mbchk_fail;
static atomic_t n_rcu_torture_mbchk_tries;
static atomic_t n_rcu_torture_error;
static long n_rcu_torture_barrier_error;
static long n_rcu_torture_boost_ktrerror;
static long n_rcu_torture_boost_failure;
static long n_rcu_torture_boosts;
static atomic_long_t n_rcu_torture_timers;
static long n_barrier_attempts;
static long n_barrier_successes;
static unsigned long n_read_exits;
static struct list_head rcu_torture_removed;
static unsigned long shutdown_jiffies;
static unsigned long start_gp_seq;
static atomic_long_t n_nocb_offload;
static atomic_long_t n_nocb_deoffload;
static int rcu_torture_writer_state;
#define RTWS_FIXED_DELAY 0
#define RTWS_DELAY 1
#define RTWS_REPLACE 2
#define RTWS_DEF_FREE 3
#define RTWS_EXP_SYNC 4
#define RTWS_COND_GET 5
#define RTWS_COND_GET_FULL 6
#define RTWS_COND_GET_EXP 7
#define RTWS_COND_GET_EXP_FULL 8
#define RTWS_COND_SYNC 9
#define RTWS_COND_SYNC_FULL 10
#define RTWS_COND_SYNC_EXP 11
#define RTWS_COND_SYNC_EXP_FULL 12
#define RTWS_POLL_GET 13
#define RTWS_POLL_GET_FULL 14
#define RTWS_POLL_GET_EXP 15
#define RTWS_POLL_GET_EXP_FULL 16
#define RTWS_POLL_WAIT 17
#define RTWS_POLL_WAIT_FULL 18
#define RTWS_POLL_WAIT_EXP 19
#define RTWS_POLL_WAIT_EXP_FULL 20
#define RTWS_SYNC 21
#define RTWS_STUTTER 22
#define RTWS_STOPPING 23
static const char * const rcu_torture_writer_state_names[] = {
"RTWS_FIXED_DELAY",
"RTWS_DELAY",
"RTWS_REPLACE",
"RTWS_DEF_FREE",
"RTWS_EXP_SYNC",
"RTWS_COND_GET",
"RTWS_COND_GET_FULL",
"RTWS_COND_GET_EXP",
"RTWS_COND_GET_EXP_FULL",
"RTWS_COND_SYNC",
"RTWS_COND_SYNC_FULL",
"RTWS_COND_SYNC_EXP",
"RTWS_COND_SYNC_EXP_FULL",
"RTWS_POLL_GET",
"RTWS_POLL_GET_FULL",
"RTWS_POLL_GET_EXP",
"RTWS_POLL_GET_EXP_FULL",
"RTWS_POLL_WAIT",
"RTWS_POLL_WAIT_FULL",
"RTWS_POLL_WAIT_EXP",
"RTWS_POLL_WAIT_EXP_FULL",
"RTWS_SYNC",
"RTWS_STUTTER",
"RTWS_STOPPING",
};
struct rt_read_seg {
int rt_readstate;
unsigned long rt_delay_jiffies;
unsigned long rt_delay_ms;
unsigned long rt_delay_us;
bool rt_preempted;
int rt_cpu;
int rt_end_cpu;
unsigned long long rt_gp_seq;
unsigned long long rt_gp_seq_end;
u64 rt_ts;
};
static int err_segs_recorded;
static struct rt_read_seg err_segs[RCUTORTURE_RDR_MAX_SEGS];
static int rt_read_nsegs;
static int rt_read_preempted;
static const char *rcu_torture_writer_state_getname(void)
{
unsigned int i = READ_ONCE(rcu_torture_writer_state);
if (i >= ARRAY_SIZE(rcu_torture_writer_state_names))
return "???";
return rcu_torture_writer_state_names[i];
}
#ifdef CONFIG_RCU_TRACE
static u64 notrace rcu_trace_clock_local(void)
{
u64 ts = trace_clock_local();
(void)do_div(ts, NSEC_PER_USEC);
return ts;
}
#else
static u64 notrace rcu_trace_clock_local(void)
{
return 0ULL;
}
#endif
static bool shutdown_time_arrived(void)
{
return shutdown_secs && time_after(jiffies, shutdown_jiffies - 30 * HZ);
}
static unsigned long boost_starttime;
static DEFINE_MUTEX(boost_mutex);
static atomic_t barrier_cbs_count;
static bool barrier_phase;
static atomic_t barrier_cbs_invoked;
static wait_queue_head_t *barrier_cbs_wq;
static DECLARE_WAIT_QUEUE_HEAD(barrier_wq);
static atomic_t rcu_fwd_cb_nodelay;
static struct rcu_torture *
rcu_torture_alloc(void)
{
struct list_head *p;
spin_lock_bh(&rcu_torture_lock);
if (list_empty(&rcu_torture_freelist)) {
atomic_inc(&n_rcu_torture_alloc_fail);
spin_unlock_bh(&rcu_torture_lock);
return NULL;
}
atomic_inc(&n_rcu_torture_alloc);
p = rcu_torture_freelist.next;
list_del_init(p);
spin_unlock_bh(&rcu_torture_lock);
return container_of(p, struct rcu_torture, rtort_free);
}
static void
rcu_torture_free(struct rcu_torture *p)
{
atomic_inc(&n_rcu_torture_free);
spin_lock_bh(&rcu_torture_lock);
list_add_tail(&p->rtort_free, &rcu_torture_freelist);
spin_unlock_bh(&rcu_torture_lock);
}
struct rcu_torture_ops {
int ttype;
void (*init)(void);
void (*cleanup)(void);
int (*readlock)(void);
void (*read_delay)(struct torture_random_state *rrsp,
struct rt_read_seg *rtrsp);
void (*readunlock)(int idx);
int (*readlock_held)(void);
int (*readlock_nesting)(void);
int (*down_read)(void);
void (*up_read)(int idx);
unsigned long (*get_gp_seq)(void);
unsigned long (*gp_diff)(unsigned long new, unsigned long old);
void (*deferred_free)(struct rcu_torture *p);
void (*sync)(void);
void (*exp_sync)(void);
void (*exp_current)(void);
unsigned long (*get_gp_state_exp)(void);
unsigned long (*start_gp_poll_exp)(void);
void (*start_gp_poll_exp_full)(struct rcu_gp_oldstate *rgosp);
bool (*poll_gp_state_exp)(unsigned long oldstate);
void (*cond_sync_exp)(unsigned long oldstate);
void (*cond_sync_exp_full)(struct rcu_gp_oldstate *rgosp);
unsigned long (*get_comp_state)(void);
void (*get_comp_state_full)(struct rcu_gp_oldstate *rgosp);
bool (*same_gp_state)(unsigned long oldstate1, unsigned long oldstate2);
bool (*same_gp_state_full)(struct rcu_gp_oldstate *rgosp1, struct rcu_gp_oldstate *rgosp2);
unsigned long (*get_gp_state)(void);
void (*get_gp_state_full)(struct rcu_gp_oldstate *rgosp);
unsigned long (*start_gp_poll)(void);
void (*start_gp_poll_full)(struct rcu_gp_oldstate *rgosp);
bool (*poll_gp_state)(unsigned long oldstate);
bool (*poll_gp_state_full)(struct rcu_gp_oldstate *rgosp);
bool (*poll_need_2gp)(bool poll, bool poll_full);
void (*cond_sync)(unsigned long oldstate);
void (*cond_sync_full)(struct rcu_gp_oldstate *rgosp);
int poll_active;
int poll_active_full;
call_rcu_func_t call;
void (*cb_barrier)(void);
void (*fqs)(void);
void (*stats)(void);
void (*gp_kthread_dbg)(void);
bool (*check_boost_failed)(unsigned long gp_state, int *cpup);
int (*stall_dur)(void);
void (*get_gp_data)(int *flags, unsigned long *gp_seq);
void (*gp_slow_register)(atomic_t *rgssp);
void (*gp_slow_unregister)(atomic_t *rgssp);
bool (*reader_blocked)(void);
unsigned long long (*gather_gp_seqs)(void);
void (*format_gp_seqs)(unsigned long long seqs, char *cp, size_t len);
void (*set_gpwrap_lag)(unsigned long lag);
int (*get_gpwrap_count)(int cpu);
long cbflood_max;
int irq_capable;
int can_boost;
int extendables;
int slow_gps;
int no_pi_lock;
int debug_objects;
int start_poll_irqsoff;
int have_up_down;
const char *name;
};
static struct rcu_torture_ops *cur_ops;
static int torture_readlock_not_held(void)
{
return rcu_read_lock_bh_held() || rcu_read_lock_sched_held();
}
static int rcu_torture_read_lock(void)
{
rcu_read_lock();
return 0;
}
static void
rcu_read_delay(struct torture_random_state *rrsp, struct rt_read_seg *rtrsp)
{
unsigned long started;
unsigned long completed;
const unsigned long shortdelay_us = 200;
unsigned long longdelay_ms = 300;
unsigned long long ts;
if (!atomic_read(&rcu_fwd_cb_nodelay) &&
!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) {
started = cur_ops->get_gp_seq();
ts = rcu_trace_clock_local();
if ((preempt_count() & HARDIRQ_MASK) || softirq_count())
longdelay_ms = 5;
mdelay(longdelay_ms);
rtrsp->rt_delay_ms = longdelay_ms;
completed = cur_ops->get_gp_seq();
do_trace_rcu_torture_read(cur_ops->name, NULL, ts,
started, completed);
}
if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) {
udelay(shortdelay_us);
rtrsp->rt_delay_us = shortdelay_us;
}
if (!preempt_count() &&
!(torture_random(rrsp) % (nrealreaders * 500)))
torture_preempt_schedule();
}
static void rcu_torture_read_unlock(int idx)
{
rcu_read_unlock();
}
static int rcu_torture_readlock_nesting(void)
{
if (IS_ENABLED(CONFIG_PREEMPT_RCU))
return rcu_preempt_depth();
if (IS_ENABLED(CONFIG_PREEMPT_COUNT))
return (preempt_count() & PREEMPT_MASK);
return -1;
}
static bool
rcu_torture_pipe_update_one(struct rcu_torture *rp)
{
int i;
struct rcu_torture_reader_check *rtrcp = READ_ONCE(rp->rtort_chkp);
if (rtrcp) {
WRITE_ONCE(rp->rtort_chkp, NULL);
smp_store_release(&rtrcp->rtc_ready, 1);
}
i = rp->rtort_pipe_count;
if (i > RCU_TORTURE_PIPE_LEN)
i = RCU_TORTURE_PIPE_LEN;
atomic_inc(&rcu_torture_wcount[i]);
WRITE_ONCE(rp->rtort_pipe_count, i + 1);
ASSERT_EXCLUSIVE_WRITER(rp->rtort_pipe_count);
if (i + 1 >= RCU_TORTURE_PIPE_LEN) {
rp->rtort_mbtest = 0;
return true;
}
return false;
}
static void
rcu_torture_pipe_update(struct rcu_torture *old_rp)
{
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()) {
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_hurry(&p->rtort_rcu, rcu_torture_cb);
}
static void rcu_sync_torture_init(void)
{
INIT_LIST_HEAD(&rcu_torture_removed);
}
static bool rcu_poll_need_2gp(bool poll, bool poll_full)
{
return poll;
}
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,
.readlock_held = torture_readlock_not_held,
.readlock_nesting = rcu_torture_readlock_nesting,
.get_gp_seq = rcu_get_gp_seq,
.gp_diff = rcu_seq_diff,
.deferred_free = rcu_torture_deferred_free,
.sync = synchronize_rcu,
.exp_sync = synchronize_rcu_expedited,
.same_gp_state = same_state_synchronize_rcu,
.same_gp_state_full = same_state_synchronize_rcu_full,
.get_comp_state = get_completed_synchronize_rcu,
.get_comp_state_full = get_completed_synchronize_rcu_full,
.get_gp_state = get_state_synchronize_rcu,
.get_gp_state_full = get_state_synchronize_rcu_full,
.start_gp_poll = start_poll_synchronize_rcu,
.start_gp_poll_full = start_poll_synchronize_rcu_full,
.poll_gp_state = poll_state_synchronize_rcu,
.poll_gp_state_full = poll_state_synchronize_rcu_full,
.poll_need_2gp = rcu_poll_need_2gp,
.cond_sync = cond_synchronize_rcu,
.cond_sync_full = cond_synchronize_rcu_full,
.poll_active = NUM_ACTIVE_RCU_POLL_OLDSTATE,
.poll_active_full = NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE,
.get_gp_state_exp = get_state_synchronize_rcu,
.start_gp_poll_exp = start_poll_synchronize_rcu_expedited,
.start_gp_poll_exp_full = start_poll_synchronize_rcu_expedited_full,
.poll_gp_state_exp = poll_state_synchronize_rcu,
.cond_sync_exp = cond_synchronize_rcu_expedited,
.cond_sync_exp_full = cond_synchronize_rcu_expedited_full,
.call = call_rcu_hurry,
.cb_barrier = rcu_barrier,
.fqs = rcu_force_quiescent_state,
.gp_kthread_dbg = show_rcu_gp_kthreads,
.check_boost_failed = rcu_check_boost_fail,
.stall_dur = rcu_jiffies_till_stall_check,
.get_gp_data = rcutorture_get_gp_data,
.gp_slow_register = rcu_gp_slow_register,
.gp_slow_unregister = rcu_gp_slow_unregister,
.reader_blocked = IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_CPU)
? has_rcu_reader_blocked
: NULL,
.gather_gp_seqs = rcutorture_gather_gp_seqs,
.format_gp_seqs = rcutorture_format_gp_seqs,
.set_gpwrap_lag = rcu_set_gpwrap_lag,
.get_gpwrap_count = rcu_get_gpwrap_count,
.irq_capable = 1,
.can_boost = IS_ENABLED(CONFIG_RCU_BOOST),
.extendables = RCUTORTURE_MAX_EXTEND,
.debug_objects = 1,
.start_poll_irqsoff = 1,
.name = "rcu"
};
static void rcu_busted_torture_deferred_free(struct rcu_torture *p)
{
rcu_torture_cb(&p->rtort_rcu);
}
static void synchronize_rcu_busted(void)
{
}
static void
call_rcu_busted(struct rcu_head *head, rcu_callback_t func)
{
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,
.readunlock = rcu_torture_read_unlock,
.readlock_held = torture_readlock_not_held,
.get_gp_seq = rcu_no_completed,
.deferred_free = rcu_busted_torture_deferred_free,
.sync = synchronize_rcu_busted,
.exp_sync = synchronize_rcu_busted,
.call = call_rcu_busted,
.gather_gp_seqs = rcutorture_gather_gp_seqs,
.format_gp_seqs = rcutorture_format_gp_seqs,
.irq_capable = 1,
.extendables = RCUTORTURE_MAX_EXTEND,
.name = "busted"
};
DEFINE_STATIC_SRCU(srcu_ctl);
DEFINE_STATIC_SRCU_FAST(srcu_ctlf);
DEFINE_STATIC_SRCU_FAST_UPDOWN(srcu_ctlfud);
static struct srcu_struct srcu_ctld;
static struct srcu_struct *srcu_ctlp = &srcu_ctl;
static struct rcu_torture_ops srcud_ops;
static void srcu_torture_init(void)
{
rcu_sync_torture_init();
if (!reader_flavor || (reader_flavor & SRCU_READ_FLAVOR_NORMAL))
VERBOSE_TOROUT_STRING("srcu_torture_init normal SRCU");
if (reader_flavor & SRCU_READ_FLAVOR_NMI)
VERBOSE_TOROUT_STRING("srcu_torture_init NMI-safe SRCU");
if (reader_flavor & SRCU_READ_FLAVOR_FAST) {
srcu_ctlp = &srcu_ctlf;
VERBOSE_TOROUT_STRING("srcu_torture_init fast SRCU");
}
if (reader_flavor & SRCU_READ_FLAVOR_FAST_UPDOWN) {
srcu_ctlp = &srcu_ctlfud;
VERBOSE_TOROUT_STRING("srcu_torture_init fast-up/down SRCU");
}
}
static void srcu_get_gp_data(int *flags, unsigned long *gp_seq)
{
srcutorture_get_gp_data(srcu_ctlp, flags, gp_seq);
}
static int srcu_torture_read_lock(void)
{
int idx;
struct srcu_ctr __percpu *scp;
int ret = 0;
WARN_ON_ONCE(reader_flavor & ~SRCU_READ_FLAVOR_ALL);
if ((reader_flavor & SRCU_READ_FLAVOR_NORMAL) || !(reader_flavor & SRCU_READ_FLAVOR_ALL)) {
idx = srcu_read_lock(srcu_ctlp);
WARN_ON_ONCE(idx & ~0x1);
ret += idx;
}
if (reader_flavor & SRCU_READ_FLAVOR_NMI) {
idx = srcu_read_lock_nmisafe(srcu_ctlp);
WARN_ON_ONCE(idx & ~0x1);
ret += idx << 1;
}
if (reader_flavor & SRCU_READ_FLAVOR_FAST) {
scp = srcu_read_lock_fast(srcu_ctlp);
idx = __srcu_ptr_to_ctr(srcu_ctlp, scp);
WARN_ON_ONCE(idx & ~0x1);
ret += idx << 2;
}
if (reader_flavor & SRCU_READ_FLAVOR_FAST_UPDOWN) {
scp = srcu_read_lock_fast_updown(srcu_ctlp);
idx = __srcu_ptr_to_ctr(srcu_ctlp, scp);
WARN_ON_ONCE(idx & ~0x1);
ret += idx << 3;
}
return ret;
}
static void
srcu_read_delay(struct torture_random_state *rrsp, struct rt_read_seg *rtrsp)
{
long delay;
const long uspertick = 1000000 / HZ;
const long longdelay = 10;
delay = torture_random(rrsp) %
(nrealreaders * 2 * longdelay * uspertick);
if (!delay && in_task()) {
schedule_timeout_interruptible(longdelay);
rtrsp->rt_delay_jiffies = longdelay;
} else {
rcu_read_delay(rrsp, rtrsp);
}
}
static void srcu_torture_read_unlock(int idx)
{
WARN_ON_ONCE((reader_flavor && (idx & ~reader_flavor)) || (!reader_flavor && (idx & ~0x1)));
if (reader_flavor & SRCU_READ_FLAVOR_FAST_UPDOWN)
srcu_read_unlock_fast_updown(srcu_ctlp,
__srcu_ctr_to_ptr(srcu_ctlp, (idx & 0x8) >> 3));
if (reader_flavor & SRCU_READ_FLAVOR_FAST)
srcu_read_unlock_fast(srcu_ctlp, __srcu_ctr_to_ptr(srcu_ctlp, (idx & 0x4) >> 2));
if (reader_flavor & SRCU_READ_FLAVOR_NMI)
srcu_read_unlock_nmisafe(srcu_ctlp, (idx & 0x2) >> 1);
if ((reader_flavor & SRCU_READ_FLAVOR_NORMAL) || !(reader_flavor & SRCU_READ_FLAVOR_ALL))
srcu_read_unlock(srcu_ctlp, idx & 0x1);
}
static int torture_srcu_read_lock_held(void)
{
return srcu_read_lock_held(srcu_ctlp);
}
static bool srcu_torture_have_up_down(void)
{
int rf = reader_flavor;
if (!rf)
rf = SRCU_READ_FLAVOR_NORMAL;
return !!(cur_ops->have_up_down & rf);
}
static int srcu_torture_down_read(void)
{
int idx;
struct srcu_ctr __percpu *scp;
WARN_ON_ONCE(reader_flavor & ~SRCU_READ_FLAVOR_ALL);
WARN_ON_ONCE(reader_flavor & (reader_flavor - 1));
if ((reader_flavor & SRCU_READ_FLAVOR_NORMAL) || !(reader_flavor & SRCU_READ_FLAVOR_ALL)) {
idx = srcu_down_read(srcu_ctlp);
WARN_ON_ONCE(idx & ~0x1);
return idx;
}
if (reader_flavor & SRCU_READ_FLAVOR_FAST_UPDOWN) {
scp = srcu_down_read_fast(srcu_ctlp);
idx = __srcu_ptr_to_ctr(srcu_ctlp, scp);
WARN_ON_ONCE(idx & ~0x1);
return idx << 3;
}
WARN_ON_ONCE(1);
return 0;
}
static void srcu_torture_up_read(int idx)
{
WARN_ON_ONCE((reader_flavor && (idx & ~reader_flavor)) || (!reader_flavor && (idx & ~0x1)));
if (reader_flavor & SRCU_READ_FLAVOR_FAST_UPDOWN)
srcu_up_read_fast(srcu_ctlp, __srcu_ctr_to_ptr(srcu_ctlp, (idx & 0x8) >> 3));
else if ((reader_flavor & SRCU_READ_FLAVOR_NORMAL) ||
!(reader_flavor & SRCU_READ_FLAVOR_ALL))
srcu_up_read(srcu_ctlp, idx & 0x1);
else
WARN_ON_ONCE(1);
}
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 unsigned long srcu_torture_get_gp_state(void)
{
return get_state_synchronize_srcu(srcu_ctlp);
}
static unsigned long srcu_torture_start_gp_poll(void)
{
return start_poll_synchronize_srcu(srcu_ctlp);
}
static bool srcu_torture_poll_gp_state(unsigned long oldstate)
{
return poll_state_synchronize_srcu(srcu_ctlp, oldstate);
}
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 void srcu_torture_expedite_current(void)
{
srcu_expedite_current(srcu_ctlp);
}
static struct rcu_torture_ops srcu_ops = {
.ttype = SRCU_FLAVOR,
.init = srcu_torture_init,
.readlock = srcu_torture_read_lock,
.read_delay = srcu_read_delay,
.readunlock = srcu_torture_read_unlock,
.down_read = srcu_torture_down_read,
.up_read = srcu_torture_up_read,
.readlock_held = torture_srcu_read_lock_held,
.get_gp_seq = srcu_torture_completed,
.gp_diff = rcu_seq_diff,
.deferred_free = srcu_torture_deferred_free,
.sync = srcu_torture_synchronize,
.exp_sync = srcu_torture_synchronize_expedited,
.exp_current = srcu_torture_expedite_current,
.same_gp_state = same_state_synchronize_srcu,
.get_comp_state = get_completed_synchronize_srcu,
.get_gp_state = srcu_torture_get_gp_state,
.start_gp_poll = srcu_torture_start_gp_poll,
.poll_gp_state = srcu_torture_poll_gp_state,
.poll_active = NUM_ACTIVE_SRCU_POLL_OLDSTATE,
.call = srcu_torture_call,
.cb_barrier = srcu_torture_barrier,
.stats = srcu_torture_stats,
.get_gp_data = srcu_get_gp_data,
.cbflood_max = 50000,
.irq_capable = 1,
.no_pi_lock = IS_ENABLED(CONFIG_TINY_SRCU),
.debug_objects = 1,
.have_up_down = IS_ENABLED(CONFIG_TINY_SRCU)
? 0 : SRCU_READ_FLAVOR_NORMAL | SRCU_READ_FLAVOR_FAST_UPDOWN,
.name = "srcu"
};
static void srcud_torture_init(void)
{
rcu_sync_torture_init();
if (!reader_flavor || (reader_flavor & SRCU_READ_FLAVOR_NORMAL)) {
WARN_ON(init_srcu_struct(&srcu_ctld));
VERBOSE_TOROUT_STRING("srcud_torture_init normal SRCU");
} else if (reader_flavor & SRCU_READ_FLAVOR_NMI) {
WARN_ON(init_srcu_struct(&srcu_ctld));
VERBOSE_TOROUT_STRING("srcud_torture_init NMI-safe SRCU");
} else if (reader_flavor & SRCU_READ_FLAVOR_FAST) {
WARN_ON(init_srcu_struct_fast(&srcu_ctld));
VERBOSE_TOROUT_STRING("srcud_torture_init fast SRCU");
} else if (reader_flavor & SRCU_READ_FLAVOR_FAST_UPDOWN) {
WARN_ON(init_srcu_struct_fast_updown(&srcu_ctld));
VERBOSE_TOROUT_STRING("srcud_torture_init fast-up/down SRCU");
} else {
WARN_ON(init_srcu_struct(&srcu_ctld));
}
srcu_ctlp = &srcu_ctld;
}
static void srcu_torture_cleanup(void)
{
cleanup_srcu_struct(&srcu_ctld);
srcu_ctlp = &srcu_ctl;
}
static struct rcu_torture_ops srcud_ops = {
.ttype = SRCU_FLAVOR,
.init = srcud_torture_init,
.cleanup = srcu_torture_cleanup,
.readlock = srcu_torture_read_lock,
.read_delay = srcu_read_delay,
.readunlock = srcu_torture_read_unlock,
.readlock_held = torture_srcu_read_lock_held,
.down_read = srcu_torture_down_read,
.up_read = srcu_torture_up_read,
.get_gp_seq = srcu_torture_completed,
.gp_diff = rcu_seq_diff,
.deferred_free = srcu_torture_deferred_free,
.sync = srcu_torture_synchronize,
.exp_sync = srcu_torture_synchronize_expedited,
.exp_current = srcu_torture_expedite_current,
.same_gp_state = same_state_synchronize_srcu,
.get_comp_state = get_completed_synchronize_srcu,
.get_gp_state = srcu_torture_get_gp_state,
.start_gp_poll = srcu_torture_start_gp_poll,
.poll_gp_state = srcu_torture_poll_gp_state,
.poll_active = NUM_ACTIVE_SRCU_POLL_OLDSTATE,
.call = srcu_torture_call,
.cb_barrier = srcu_torture_barrier,
.stats = srcu_torture_stats,
.get_gp_data = srcu_get_gp_data,
.cbflood_max = 50000,
.irq_capable = 1,
.no_pi_lock = IS_ENABLED(CONFIG_TINY_SRCU),
.debug_objects = 1,
.have_up_down = IS_ENABLED(CONFIG_TINY_SRCU)
? 0 : SRCU_READ_FLAVOR_NORMAL | SRCU_READ_FLAVOR_FAST_UPDOWN,
.name = "srcud"
};
static struct rcu_torture_ops busted_srcud_ops = {
.ttype = SRCU_FLAVOR,
.init = srcu_torture_init,
.cleanup = srcu_torture_cleanup,
.readlock = srcu_torture_read_lock,
.read_delay = rcu_read_delay,
.readunlock = srcu_torture_read_unlock,
.readlock_held = torture_srcu_read_lock_held,
.get_gp_seq = 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,
.no_pi_lock = IS_ENABLED(CONFIG_TINY_SRCU),
.extendables = RCUTORTURE_MAX_EXTEND,
.name = "busted_srcud"
};
static void synchronize_rcu_trivial(void)
{
int cpu;
for_each_online_cpu(cpu) {
torture_sched_setaffinity(current->pid, cpumask_of(cpu), true);
WARN_ON_ONCE(raw_smp_processor_id() != cpu);
}
}
static void rcu_sync_torture_init_trivial(void)
{
rcu_sync_torture_init();
if (WARN_ONCE(onoff_interval || shuffle_interval, "%s: Non-zero onoff_interval (%d) or shuffle_interval (%d) breaks trivial RCU, resetting to zero", __func__, onoff_interval, shuffle_interval)) {
onoff_interval = 0;
shuffle_interval = 0;
}
}
static int rcu_torture_read_lock_trivial(void)
{
preempt_disable();
return 0;
}
static void rcu_torture_read_unlock_trivial(int idx)
{
preempt_enable();
}
static struct rcu_torture_ops trivial_ops = {
.ttype = RCU_TRIVIAL_FLAVOR,
.init = rcu_sync_torture_init_trivial,
.readlock = rcu_torture_read_lock_trivial,
.read_delay = rcu_read_delay,
.readunlock = rcu_torture_read_unlock_trivial,
.readlock_held = torture_readlock_not_held,
.get_gp_seq = rcu_no_completed,
.sync = synchronize_rcu_trivial,
.exp_sync = synchronize_rcu_trivial,
.irq_capable = 1,
.name = "trivial"
};
#ifdef CONFIG_TASKS_RCU
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 void synchronize_rcu_mult_test(void)
{
synchronize_rcu_mult(call_rcu_tasks, call_rcu_hurry);
}
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,
.readunlock = tasks_torture_read_unlock,
.get_gp_seq = rcu_no_completed,
.deferred_free = rcu_tasks_torture_deferred_free,
.sync = synchronize_rcu_tasks,
.exp_sync = synchronize_rcu_mult_test,
.call = call_rcu_tasks,
.cb_barrier = rcu_barrier_tasks,
.gp_kthread_dbg = show_rcu_tasks_classic_gp_kthread,
.get_gp_data = rcu_tasks_get_gp_data,
.irq_capable = 1,
.slow_gps = 1,
.name = "tasks"
};
#define TASKS_OPS &tasks_ops,
#else
#define TASKS_OPS
#endif
#ifdef CONFIG_TASKS_RUDE_RCU
static struct rcu_torture_ops tasks_rude_ops = {
.ttype = RCU_TASKS_RUDE_FLAVOR,
.init = rcu_sync_torture_init,
.readlock = rcu_torture_read_lock_trivial,
.read_delay = rcu_read_delay,
.readunlock = rcu_torture_read_unlock_trivial,
.get_gp_seq = rcu_no_completed,
.sync = synchronize_rcu_tasks_rude,
.exp_sync = synchronize_rcu_tasks_rude,
.gp_kthread_dbg = show_rcu_tasks_rude_gp_kthread,
.get_gp_data = rcu_tasks_rude_get_gp_data,
.cbflood_max = 50000,
.irq_capable = 1,
.name = "tasks-rude"
};
#define TASKS_RUDE_OPS &tasks_rude_ops,
#else
#define TASKS_RUDE_OPS
#endif
#ifdef CONFIG_TASKS_TRACE_RCU
static int tasks_tracing_torture_read_lock(void)
{
rcu_read_lock_trace();
return 0;
}
static void tasks_tracing_torture_read_unlock(int idx)
{
rcu_read_unlock_trace();
}
static void rcu_tasks_tracing_torture_deferred_free(struct rcu_torture *p)
{
call_rcu_tasks_trace(&p->rtort_rcu, rcu_torture_cb);
}
static struct rcu_torture_ops tasks_tracing_ops = {
.ttype = RCU_TASKS_TRACING_FLAVOR,
.init = rcu_sync_torture_init,
.readlock = tasks_tracing_torture_read_lock,
.read_delay = srcu_read_delay,
.readunlock = tasks_tracing_torture_read_unlock,
.readlock_held = rcu_read_lock_trace_held,
.get_gp_seq = rcu_no_completed,
.deferred_free = rcu_tasks_tracing_torture_deferred_free,
.sync = synchronize_rcu_tasks_trace,
.exp_sync = synchronize_rcu_tasks_trace,
.exp_current = rcu_tasks_trace_expedite_current,
.call = call_rcu_tasks_trace,
.cb_barrier = rcu_barrier_tasks_trace,
.cbflood_max = 50000,
.irq_capable = 1,
.slow_gps = 1,
.name = "tasks-tracing"
};
#define TASKS_TRACING_OPS &tasks_tracing_ops,
#else
#define TASKS_TRACING_OPS
#endif
static unsigned long rcutorture_seq_diff(unsigned long new, unsigned long old)
{
if (!cur_ops->gp_diff)
return new - old;
return cur_ops->gp_diff(new, old);
}
static int old_rt_runtime = -1;
static void rcu_torture_disable_rt_throttle(void)
{
if (!IS_BUILTIN(CONFIG_RCU_TORTURE_TEST) || old_rt_runtime != -1)
return;
old_rt_runtime = sysctl_sched_rt_runtime;
sysctl_sched_rt_runtime = -1;
}
static void rcu_torture_enable_rt_throttle(void)
{
if (!IS_BUILTIN(CONFIG_RCU_TORTURE_TEST) || old_rt_runtime == -1)
return;
sysctl_sched_rt_runtime = old_rt_runtime;
old_rt_runtime = -1;
}
static bool rcu_torture_boost_failed(unsigned long gp_state, unsigned long *start)
{
int cpu;
static int dbg_done;
unsigned long end = jiffies;
bool gp_done;
unsigned long j;
static unsigned long last_persist;
unsigned long lp;
unsigned long mininterval = test_boost_duration * HZ - HZ / 2;
if (end - *start > mininterval) {
smp_mb();
if (cur_ops->poll_gp_state(gp_state))
return false;
if (cur_ops->check_boost_failed && !cur_ops->check_boost_failed(gp_state, &cpu)) {
j = jiffies;
lp = READ_ONCE(last_persist);
if (time_after(j, lp + mininterval) &&
cmpxchg(&last_persist, lp, j) == lp) {
if (cpu < 0)
pr_info("Boost inversion persisted: QS from all CPUs\n");
else
pr_info("Boost inversion persisted: No QS from CPU %d\n", cpu);
}
return false;
}
VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed");
n_rcu_torture_boost_failure++;
if (!xchg(&dbg_done, 1) && cur_ops->gp_kthread_dbg) {
pr_info("Boost inversion thread ->rt_priority %u gp_state %lu jiffies %lu\n",
current->rt_priority, gp_state, end - *start);
cur_ops->gp_kthread_dbg();
gp_done = cur_ops->poll_gp_state(gp_state);
pr_info("Boost inversion: GP %lu %s.\n", gp_state,
gp_done ? "ended already" : "still pending");
}
return true;
} else if (cur_ops->check_boost_failed && !cur_ops->check_boost_failed(gp_state, NULL)) {
*start = jiffies;
}
return false;
}
static int rcu_torture_boost(void *arg)
{
unsigned long endtime;
unsigned long gp_state;
unsigned long gp_state_time;
unsigned long oldstarttime;
unsigned long booststarttime = get_torture_init_jiffies() + test_boost_holdoff * HZ;
if (test_boost_holdoff <= 0 || time_after(jiffies, booststarttime)) {
VERBOSE_TOROUT_STRING("rcu_torture_boost started");
} else {
VERBOSE_TOROUT_STRING("rcu_torture_boost started holdoff period");
while (time_before(jiffies, booststarttime)) {
schedule_timeout_idle(HZ);
if (kthread_should_stop())
goto cleanup;
}
VERBOSE_TOROUT_STRING("rcu_torture_boost finished holdoff period");
}
sched_set_fifo_low(current);
do {
bool failed = false;
bool gp_initiated = false;
if (kthread_should_stop())
goto checkwait;
oldstarttime = READ_ONCE(boost_starttime);
while (time_before(jiffies, oldstarttime)) {
schedule_timeout_interruptible(oldstarttime - jiffies);
if (stutter_wait("rcu_torture_boost"))
sched_set_fifo_low(current);
if (torture_must_stop())
goto checkwait;
}
endtime = oldstarttime + test_boost_duration * HZ;
while (time_before(jiffies, endtime)) {
if (gp_initiated && !failed && !cur_ops->poll_gp_state(gp_state))
failed = rcu_torture_boost_failed(gp_state, &gp_state_time);
if (!gp_initiated || cur_ops->poll_gp_state(gp_state)) {
gp_state = cur_ops->start_gp_poll();
gp_initiated = true;
gp_state_time = jiffies;
}
if (stutter_wait("rcu_torture_boost")) {
sched_set_fifo_low(current);
if (cur_ops->poll_gp_state(gp_state))
gp_initiated = false;
}
if (torture_must_stop())
goto checkwait;
}
if (gp_initiated && !failed && !cur_ops->poll_gp_state(gp_state))
rcu_torture_boost_failed(gp_state, &gp_state_time);
while (oldstarttime == READ_ONCE(boost_starttime) && !kthread_should_stop()) {
if (mutex_trylock(&boost_mutex)) {
if (oldstarttime == boost_starttime) {
WRITE_ONCE(boost_starttime,
jiffies + test_boost_interval * HZ);
n_rcu_torture_boosts++;
}
mutex_unlock(&boost_mutex);
break;
}
schedule_timeout_uninterruptible(HZ / 20);
}
checkwait: if (stutter_wait("rcu_torture_boost"))
sched_set_fifo_low(current);
} while (!torture_must_stop());
cleanup:
while (!kthread_should_stop()) {
torture_shutdown_absorb("rcu_torture_boost");
schedule_timeout_uninterruptible(HZ / 20);
}
torture_kthread_stopping("rcu_torture_boost");
return 0;
}
static int
rcu_torture_fqs(void *arg)
{
unsigned long fqs_resume_time;
int fqs_burst_remaining;
int oldnice = task_nice(current);
VERBOSE_TOROUT_STRING("rcu_torture_fqs task started");
do {
fqs_resume_time = jiffies + fqs_stutter * HZ;
while (time_before(jiffies, fqs_resume_time) &&
!kthread_should_stop()) {
schedule_timeout_interruptible(HZ / 20);
}
fqs_burst_remaining = fqs_duration;
while (fqs_burst_remaining > 0 &&
!kthread_should_stop()) {
cur_ops->fqs();
udelay(fqs_holdoff);
fqs_burst_remaining -= fqs_holdoff;
}
if (stutter_wait("rcu_torture_fqs"))
sched_set_normal(current, oldnice);
} while (!torture_must_stop());
torture_kthread_stopping("rcu_torture_fqs");
return 0;
}
static int synctype[ARRAY_SIZE(rcu_torture_writer_state_names)] = { };
static int nsynctypes;
static void rcu_torture_write_types(void)
{
bool gp_cond1 = gp_cond, gp_cond_exp1 = gp_cond_exp, gp_cond_full1 = gp_cond_full;
bool gp_cond_exp_full1 = gp_cond_exp_full, gp_exp1 = gp_exp, gp_poll_exp1 = gp_poll_exp;
bool gp_poll_exp_full1 = gp_poll_exp_full, gp_normal1 = gp_normal, gp_poll1 = gp_poll;
bool gp_poll_full1 = gp_poll_full, gp_sync1 = gp_sync;
if (!gp_cond1 &&
!gp_cond_exp1 &&
!gp_cond_full1 &&
!gp_cond_exp_full1 &&
!gp_exp1 &&
!gp_poll_exp1 &&
!gp_poll_exp_full1 &&
!gp_normal1 &&
!gp_poll1 &&
!gp_poll_full1 &&
!gp_sync1) {
gp_cond1 = true;
gp_cond_exp1 = true;
gp_cond_full1 = true;
gp_cond_exp_full1 = true;
gp_exp1 = true;
gp_poll_exp1 = true;
gp_poll_exp_full1 = true;
gp_normal1 = true;
gp_poll1 = true;
gp_poll_full1 = true;
gp_sync1 = true;
}
if (gp_cond1 && cur_ops->get_gp_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_gp_state || !cur_ops->cond_sync)) {
pr_alert("%s: gp_cond without primitives.\n", __func__);
}
if (gp_cond_exp1 && cur_ops->get_gp_state_exp && cur_ops->cond_sync_exp) {
synctype[nsynctypes++] = RTWS_COND_GET_EXP;
pr_info("%s: Testing conditional expedited GPs.\n", __func__);
} else if (gp_cond_exp && (!cur_ops->get_gp_state_exp || !cur_ops->cond_sync_exp)) {
pr_alert("%s: gp_cond_exp without primitives.\n", __func__);
}
if (gp_cond_full1 && cur_ops->get_gp_state && cur_ops->cond_sync_full) {
synctype[nsynctypes++] = RTWS_COND_GET_FULL;
pr_info("%s: Testing conditional full-state GPs.\n", __func__);
} else if (gp_cond_full && (!cur_ops->get_gp_state || !cur_ops->cond_sync_full)) {
pr_alert("%s: gp_cond_full without primitives.\n", __func__);
}
if (gp_cond_exp_full1 && cur_ops->get_gp_state_exp && cur_ops->cond_sync_exp_full) {
synctype[nsynctypes++] = RTWS_COND_GET_EXP_FULL;
pr_info("%s: Testing conditional full-state expedited GPs.\n", __func__);
} else if (gp_cond_exp_full &&
(!cur_ops->get_gp_state_exp || !cur_ops->cond_sync_exp_full)) {
pr_alert("%s: gp_cond_exp_full 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_poll1 && cur_ops->get_comp_state && cur_ops->same_gp_state &&
cur_ops->start_gp_poll && cur_ops->poll_gp_state) {
synctype[nsynctypes++] = RTWS_POLL_GET;
pr_info("%s: Testing polling GPs.\n", __func__);
} else if (gp_poll && (!cur_ops->start_gp_poll || !cur_ops->poll_gp_state)) {
pr_alert("%s: gp_poll without primitives.\n", __func__);
}
if (gp_poll_full1 && cur_ops->get_comp_state_full && cur_ops->same_gp_state_full
&& cur_ops->start_gp_poll_full && cur_ops->poll_gp_state_full) {
synctype[nsynctypes++] = RTWS_POLL_GET_FULL;
pr_info("%s: Testing polling full-state GPs.\n", __func__);
} else if (gp_poll_full && (!cur_ops->start_gp_poll_full || !cur_ops->poll_gp_state_full)) {
pr_alert("%s: gp_poll_full without primitives.\n", __func__);
}
if (gp_poll_exp1 && cur_ops->start_gp_poll_exp && cur_ops->poll_gp_state_exp) {
synctype[nsynctypes++] = RTWS_POLL_GET_EXP;
pr_info("%s: Testing polling expedited GPs.\n", __func__);
} else if (gp_poll_exp && (!cur_ops->start_gp_poll_exp || !cur_ops->poll_gp_state_exp)) {
pr_alert("%s: gp_poll_exp without primitives.\n", __func__);
}
if (gp_poll_exp_full1 && cur_ops->start_gp_poll_exp_full && cur_ops->poll_gp_state_full) {
synctype[nsynctypes++] = RTWS_POLL_GET_EXP_FULL;
pr_info("%s: Testing polling full-state expedited GPs.\n", __func__);
} else if (gp_poll_exp_full &&
(!cur_ops->start_gp_poll_exp_full || !cur_ops->poll_gp_state_full)) {
pr_alert("%s: gp_poll_exp_full 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__);
}
pr_alert("%s: Testing %d update types.\n", __func__, nsynctypes);
pr_info("%s: gp_cond_wi %d gp_cond_wi_exp %d gp_poll_wi %d gp_poll_wi_exp %d\n", __func__, gp_cond_wi, gp_cond_wi_exp, gp_poll_wi, gp_poll_wi_exp);
}
static void do_rtws_sync(struct torture_random_state *trsp, void (*sync)(void))
{
unsigned long cookie;
struct rcu_gp_oldstate cookie_full;
bool dopoll;
bool dopoll_full;
unsigned long r = torture_random(trsp);
dopoll = cur_ops->get_gp_state && cur_ops->poll_gp_state && !(r & 0x300);
dopoll_full = cur_ops->get_gp_state_full && cur_ops->poll_gp_state_full && !(r & 0xc00);
if (dopoll || dopoll_full)
cpus_read_lock();
if (dopoll)
cookie = cur_ops->get_gp_state();
if (dopoll_full)
cur_ops->get_gp_state_full(&cookie_full);
if (cur_ops->poll_need_2gp && cur_ops->poll_need_2gp(dopoll, dopoll_full))
sync();
sync();
WARN_ONCE(dopoll && !cur_ops->poll_gp_state(cookie),
"%s: Cookie check 3 failed %pS() online %*pbl.",
__func__, sync, cpumask_pr_args(cpu_online_mask));
WARN_ONCE(dopoll_full && !cur_ops->poll_gp_state_full(&cookie_full),
"%s: Cookie check 4 failed %pS() online %*pbl",
__func__, sync, cpumask_pr_args(cpu_online_mask));
if (dopoll || dopoll_full)
cpus_read_unlock();
}
static int
rcu_torture_writer(void *arg)
{
bool booting_still = false;
bool can_expedite = !rcu_gp_is_expedited() && !rcu_gp_is_normal();
unsigned long cookie;
struct rcu_gp_oldstate cookie_full;
int expediting = 0;
unsigned long gp_snap;
unsigned long gp_snap1;
struct rcu_gp_oldstate gp_snap_full;
struct rcu_gp_oldstate gp_snap1_full;
int i;
int idx;
unsigned long j;
int oldnice = task_nice(current);
struct rcu_gp_oldstate *rgo = NULL;
int rgo_size = 0;
struct rcu_torture *rp;
struct rcu_torture *old_rp;
static DEFINE_TORTURE_RANDOM(rand);
unsigned long stallsdone = jiffies;
bool stutter_waited;
unsigned long *ulo = NULL;
int ulo_size = 0;
if (stall_cpu_holdoff + stall_gp_kthread + stall_cpu)
stallsdone += (stall_cpu_holdoff + stall_gp_kthread + stall_cpu + 60) *
HZ * (stall_cpu_repeat + 1);
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);
if (WARN_ONCE(nsynctypes == 0,
"%s: No update-side primitives.\n", __func__)) {
rcu_torture_writer_state = RTWS_STOPPING;
torture_kthread_stopping("rcu_torture_writer");
return 0;
}
if (cur_ops->poll_active > 0) {
ulo = kcalloc(cur_ops->poll_active, sizeof(*ulo), GFP_KERNEL);
if (!WARN_ON(!ulo))
ulo_size = cur_ops->poll_active;
}
if (cur_ops->poll_active_full > 0) {
rgo = kzalloc_objs(*rgo, cur_ops->poll_active_full);
if (!WARN_ON(!rgo))
rgo_size = cur_ops->poll_active_full;
}
j = jiffies;
while (!torture_must_stop() && !rcu_inkernel_boot_has_ended()) {
booting_still = true;
schedule_timeout_interruptible(HZ);
}
if (booting_still)
pr_alert("%s" TORTURE_FLAG " Waited %lu jiffies for boot to complete.\n",
torture_type, jiffies - j);
do {
rcu_torture_writer_state = RTWS_FIXED_DELAY;
torture_hrtimeout_us(500, 1000, &rand);
rp = rcu_torture_alloc();
if (rp == NULL)
continue;
rp->rtort_pipe_count = 0;
ASSERT_EXCLUSIVE_WRITER(rp->rtort_pipe_count);
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();
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]);
WRITE_ONCE(old_rp->rtort_pipe_count,
old_rp->rtort_pipe_count + 1);
ASSERT_EXCLUSIVE_WRITER(old_rp->rtort_pipe_count);
if (cur_ops->get_gp_state && cur_ops->poll_gp_state) {
idx = cur_ops->readlock();
cookie = cur_ops->get_gp_state();
WARN_ONCE(cur_ops->poll_gp_state(cookie),
"%s: Cookie check 1 failed %s(%d) %lu->%lu\n",
__func__,
rcu_torture_writer_state_getname(),
rcu_torture_writer_state,
cookie, cur_ops->get_gp_state());
if (cur_ops->get_comp_state) {
cookie = cur_ops->get_comp_state();
WARN_ON_ONCE(!cur_ops->poll_gp_state(cookie));
}
cur_ops->readunlock(idx);
}
if (cur_ops->get_gp_state_full && cur_ops->poll_gp_state_full) {
idx = cur_ops->readlock();
cur_ops->get_gp_state_full(&cookie_full);
WARN_ONCE(cur_ops->poll_gp_state_full(&cookie_full),
"%s: Cookie check 5 failed %s(%d) online %*pbl\n",
__func__,
rcu_torture_writer_state_getname(),
rcu_torture_writer_state,
cpumask_pr_args(cpu_online_mask));
if (cur_ops->get_comp_state_full) {
cur_ops->get_comp_state_full(&cookie_full);
WARN_ON_ONCE(!cur_ops->poll_gp_state_full(&cookie_full));
}
cur_ops->readunlock(idx);
}
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;
do_rtws_sync(&rand, 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_gp_state();
torture_hrtimeout_us(torture_random(&rand) % gp_cond_wi,
1000, &rand);
rcu_torture_writer_state = RTWS_COND_SYNC;
cur_ops->cond_sync(gp_snap);
rcu_torture_pipe_update(old_rp);
break;
case RTWS_COND_GET_EXP:
rcu_torture_writer_state = RTWS_COND_GET_EXP;
gp_snap = cur_ops->get_gp_state_exp();
torture_hrtimeout_us(torture_random(&rand) % gp_cond_wi_exp,
1000, &rand);
rcu_torture_writer_state = RTWS_COND_SYNC_EXP;
cur_ops->cond_sync_exp(gp_snap);
rcu_torture_pipe_update(old_rp);
break;
case RTWS_COND_GET_FULL:
rcu_torture_writer_state = RTWS_COND_GET_FULL;
cur_ops->get_gp_state_full(&gp_snap_full);
torture_hrtimeout_us(torture_random(&rand) % gp_cond_wi,
1000, &rand);
rcu_torture_writer_state = RTWS_COND_SYNC_FULL;
cur_ops->cond_sync_full(&gp_snap_full);
rcu_torture_pipe_update(old_rp);
break;
case RTWS_COND_GET_EXP_FULL:
rcu_torture_writer_state = RTWS_COND_GET_EXP_FULL;
cur_ops->get_gp_state_full(&gp_snap_full);
torture_hrtimeout_us(torture_random(&rand) % gp_cond_wi_exp,
1000, &rand);
rcu_torture_writer_state = RTWS_COND_SYNC_EXP_FULL;
cur_ops->cond_sync_exp_full(&gp_snap_full);
rcu_torture_pipe_update(old_rp);
break;
case RTWS_POLL_GET:
rcu_torture_writer_state = RTWS_POLL_GET;
for (i = 0; i < ulo_size; i++)
ulo[i] = cur_ops->get_comp_state();
gp_snap = cur_ops->start_gp_poll();
rcu_torture_writer_state = RTWS_POLL_WAIT;
if (cur_ops->exp_current && !(torture_random(&rand) & 0xff))
cur_ops->exp_current();
while (!cur_ops->poll_gp_state(gp_snap)) {
gp_snap1 = cur_ops->get_gp_state();
for (i = 0; i < ulo_size; i++)
if (cur_ops->poll_gp_state(ulo[i]) ||
cur_ops->same_gp_state(ulo[i], gp_snap1)) {
ulo[i] = gp_snap1;
break;
}
WARN_ON_ONCE(ulo_size > 0 && i >= ulo_size);
torture_hrtimeout_us(torture_random(&rand) % gp_poll_wi,
1000, &rand);
}
rcu_torture_pipe_update(old_rp);
break;
case RTWS_POLL_GET_FULL:
rcu_torture_writer_state = RTWS_POLL_GET_FULL;
for (i = 0; i < rgo_size; i++)
cur_ops->get_comp_state_full(&rgo[i]);
cur_ops->start_gp_poll_full(&gp_snap_full);
rcu_torture_writer_state = RTWS_POLL_WAIT_FULL;
if (cur_ops->exp_current && !(torture_random(&rand) & 0xff))
cur_ops->exp_current();
while (!cur_ops->poll_gp_state_full(&gp_snap_full)) {
cur_ops->get_gp_state_full(&gp_snap1_full);
for (i = 0; i < rgo_size; i++)
if (cur_ops->poll_gp_state_full(&rgo[i]) ||
cur_ops->same_gp_state_full(&rgo[i],
&gp_snap1_full)) {
rgo[i] = gp_snap1_full;
break;
}
WARN_ON_ONCE(rgo_size > 0 && i >= rgo_size);
torture_hrtimeout_us(torture_random(&rand) % gp_poll_wi,
1000, &rand);
}
rcu_torture_pipe_update(old_rp);
break;
case RTWS_POLL_GET_EXP:
rcu_torture_writer_state = RTWS_POLL_GET_EXP;
gp_snap = cur_ops->start_gp_poll_exp();
rcu_torture_writer_state = RTWS_POLL_WAIT_EXP;
while (!cur_ops->poll_gp_state_exp(gp_snap))
torture_hrtimeout_us(torture_random(&rand) % gp_poll_wi_exp,
1000, &rand);
rcu_torture_pipe_update(old_rp);
break;
case RTWS_POLL_GET_EXP_FULL:
rcu_torture_writer_state = RTWS_POLL_GET_EXP_FULL;
cur_ops->start_gp_poll_exp_full(&gp_snap_full);
rcu_torture_writer_state = RTWS_POLL_WAIT_EXP_FULL;
while (!cur_ops->poll_gp_state_full(&gp_snap_full))
torture_hrtimeout_us(torture_random(&rand) % gp_poll_wi_exp,
1000, &rand);
rcu_torture_pipe_update(old_rp);
break;
case RTWS_SYNC:
rcu_torture_writer_state = RTWS_SYNC;
do_rtws_sync(&rand, cur_ops->sync);
rcu_torture_pipe_update(old_rp);
break;
default:
WARN_ON_ONCE(1);
break;
}
}
WRITE_ONCE(rcu_torture_current_version,
rcu_torture_current_version + 1);
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) {
can_expedite = !rcu_gp_is_expedited() &&
!rcu_gp_is_normal();
}
rcu_torture_writer_state = RTWS_STUTTER;
stutter_waited = stutter_wait("rcu_torture_writer");
if (stutter_waited &&
!atomic_read(&rcu_fwd_cb_nodelay) &&
!cur_ops->slow_gps &&
!torture_must_stop() &&
time_after(jiffies, stallsdone))
for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++)
if (list_empty(&rcu_tortures[i].rtort_free) &&
rcu_access_pointer(rcu_torture_current) != &rcu_tortures[i]) {
tracing_off();
if (cur_ops->gp_kthread_dbg)
cur_ops->gp_kthread_dbg();
WARN(1, "%s: rtort_pipe_count: %d\n", __func__, rcu_tortures[i].rtort_pipe_count);
rcu_ftrace_dump(DUMP_ALL);
break;
}
if (stutter_waited)
sched_set_normal(current, oldnice);
} while (!torture_must_stop());
rcu_torture_current = NULL;
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);
kfree(ulo);
kfree(rgo);
rcu_torture_writer_state = RTWS_STOPPING;
torture_kthread_stopping("rcu_torture_writer");
return 0;
}
static int
rcu_torture_fakewriter(void *arg)
{
unsigned long gp_snap;
struct rcu_gp_oldstate gp_snap_full;
DEFINE_TORTURE_RANDOM(rand);
VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started");
set_user_nice(current, MAX_NICE);
if (WARN_ONCE(nsynctypes == 0,
"%s: No update-side primitives.\n", __func__)) {
torture_kthread_stopping("rcu_torture_fakewriter");
return 0;
}
do {
torture_hrtimeout_jiffies(torture_random(&rand) % 10, &rand);
if (cur_ops->cb_barrier != NULL &&
torture_random(&rand) % (nrealfakewriters * 8) == 0) {
cur_ops->cb_barrier();
} else {
switch (synctype[torture_random(&rand) % nsynctypes]) {
case RTWS_DEF_FREE:
break;
case RTWS_EXP_SYNC:
cur_ops->exp_sync();
break;
case RTWS_COND_GET:
gp_snap = cur_ops->get_gp_state();
torture_hrtimeout_jiffies(torture_random(&rand) % 16, &rand);
cur_ops->cond_sync(gp_snap);
break;
case RTWS_COND_GET_EXP:
gp_snap = cur_ops->get_gp_state_exp();
torture_hrtimeout_jiffies(torture_random(&rand) % 16, &rand);
cur_ops->cond_sync_exp(gp_snap);
break;
case RTWS_COND_GET_FULL:
cur_ops->get_gp_state_full(&gp_snap_full);
torture_hrtimeout_jiffies(torture_random(&rand) % 16, &rand);
cur_ops->cond_sync_full(&gp_snap_full);
break;
case RTWS_COND_GET_EXP_FULL:
cur_ops->get_gp_state_full(&gp_snap_full);
torture_hrtimeout_jiffies(torture_random(&rand) % 16, &rand);
cur_ops->cond_sync_exp_full(&gp_snap_full);
break;
case RTWS_POLL_GET:
if (cur_ops->start_poll_irqsoff)
local_irq_disable();
gp_snap = cur_ops->start_gp_poll();
if (cur_ops->start_poll_irqsoff)
local_irq_enable();
while (!cur_ops->poll_gp_state(gp_snap)) {
torture_hrtimeout_jiffies(torture_random(&rand) % 16,
&rand);
}
break;
case RTWS_POLL_GET_FULL:
if (cur_ops->start_poll_irqsoff)
local_irq_disable();
cur_ops->start_gp_poll_full(&gp_snap_full);
if (cur_ops->start_poll_irqsoff)
local_irq_enable();
while (!cur_ops->poll_gp_state_full(&gp_snap_full)) {
torture_hrtimeout_jiffies(torture_random(&rand) % 16,
&rand);
}
break;
case RTWS_POLL_GET_EXP:
gp_snap = cur_ops->start_gp_poll_exp();
while (!cur_ops->poll_gp_state_exp(gp_snap)) {
torture_hrtimeout_jiffies(torture_random(&rand) % 16,
&rand);
}
break;
case RTWS_POLL_GET_EXP_FULL:
cur_ops->start_gp_poll_exp_full(&gp_snap_full);
while (!cur_ops->poll_gp_state_full(&gp_snap_full)) {
torture_hrtimeout_jiffies(torture_random(&rand) % 16,
&rand);
}
break;
case RTWS_SYNC:
cur_ops->sync();
break;
default:
WARN_ON_ONCE(1);
break;
}
}
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);
}
static void rcu_torture_reader_do_mbchk(long myid, struct rcu_torture *rtp,
struct torture_random_state *trsp)
{
unsigned long loops;
int noc = torture_num_online_cpus();
int rdrchked;
int rdrchker;
struct rcu_torture_reader_check *rtrcp;
struct rcu_torture_reader_check *rtrcp_assigner;
struct rcu_torture_reader_check *rtrcp_chked;
struct rcu_torture_reader_check *rtrcp_chker;
if (myid < 0)
return;
rtrcp = &rcu_torture_reader_mbchk[myid];
WRITE_ONCE(rtrcp->rtc_myloops, rtrcp->rtc_myloops + 1);
rdrchked = torture_random(trsp) % nrealreaders;
rtrcp_chked = &rcu_torture_reader_mbchk[rdrchked];
rdrchker = torture_random(trsp) % nrealreaders;
rtrcp_chker = &rcu_torture_reader_mbchk[rdrchker];
if (rdrchked != myid && rdrchked != rdrchker && noc >= rdrchked && noc >= rdrchker &&
smp_load_acquire(&rtrcp->rtc_chkrdr) < 0 &&
!READ_ONCE(rtp->rtort_chkp) &&
!smp_load_acquire(&rtrcp_chker->rtc_assigner)) {
rtrcp->rtc_chkloops = READ_ONCE(rtrcp_chked->rtc_myloops);
WARN_ON_ONCE(rtrcp->rtc_chkrdr >= 0);
rtrcp->rtc_chkrdr = rdrchked;
WARN_ON_ONCE(rtrcp->rtc_ready);
if (cmpxchg_relaxed(&rtrcp_chker->rtc_assigner, NULL, rtrcp) ||
cmpxchg_relaxed(&rtp->rtort_chkp, NULL, rtrcp))
(void)cmpxchg_relaxed(&rtrcp_chker->rtc_assigner, rtrcp, NULL);
}
rtrcp_assigner = READ_ONCE(rtrcp->rtc_assigner);
if (!rtrcp_assigner || !smp_load_acquire(&rtrcp_assigner->rtc_ready))
return;
rdrchked = rtrcp_assigner->rtc_chkrdr;
if (WARN_ON_ONCE(rdrchked < 0))
return;
rtrcp_chked = &rcu_torture_reader_mbchk[rdrchked];
loops = READ_ONCE(rtrcp_chked->rtc_myloops);
atomic_inc(&n_rcu_torture_mbchk_tries);
if (ULONG_CMP_LT(loops, rtrcp_assigner->rtc_chkloops))
atomic_inc(&n_rcu_torture_mbchk_fail);
rtrcp_assigner->rtc_chkloops = loops + ULONG_MAX / 2;
rtrcp_assigner->rtc_ready = 0;
smp_store_release(&rtrcp->rtc_assigner, NULL);
smp_store_release(&rtrcp_assigner->rtc_chkrdr, -1);
}
#define ROEC_ARGS "%s %s: Current %#x To add %#x To remove %#x preempt_count() %#x\n", __func__, s, curstate, new, old, preempt_count()
static void rcutorture_one_extend_check(char *s, int curstate, int new, int old)
{
int mask;
if (!IS_ENABLED(CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE) || in_nmi())
return;
WARN_ONCE(!(curstate & RCUTORTURE_RDR_IRQ) && irqs_disabled() && !in_hardirq(), ROEC_ARGS);
WARN_ONCE((curstate & RCUTORTURE_RDR_IRQ) && !irqs_disabled(), ROEC_ARGS);
if (!IS_ENABLED(CONFIG_PREEMPT_COUNT))
return;
WARN_ONCE((curstate & (RCUTORTURE_RDR_BH | RCUTORTURE_RDR_RBH)) &&
!softirq_count(), ROEC_ARGS);
WARN_ONCE((curstate & (RCUTORTURE_RDR_PREEMPT | RCUTORTURE_RDR_SCHED)) &&
!(preempt_count() & PREEMPT_MASK), ROEC_ARGS);
WARN_ONCE(cur_ops->readlock_nesting &&
(curstate & (RCUTORTURE_RDR_RCU_1 | RCUTORTURE_RDR_RCU_2)) &&
cur_ops->readlock_nesting() == 0, ROEC_ARGS);
if (in_serving_softirq() || in_hardirq())
return;
WARN_ONCE(cur_ops->extendables &&
!(curstate & (RCUTORTURE_RDR_BH | RCUTORTURE_RDR_RBH)) &&
softirq_count(), ROEC_ARGS);
mask = RCUTORTURE_RDR_PREEMPT | RCUTORTURE_RDR_SCHED;
if (!IS_ENABLED(CONFIG_PREEMPT_RCU))
mask |= RCUTORTURE_RDR_RCU_1 | RCUTORTURE_RDR_RCU_2;
WARN_ONCE(cur_ops->extendables && !(curstate & mask) &&
(preempt_count() & PREEMPT_MASK), ROEC_ARGS);
mask = RCUTORTURE_RDR_RCU_1 | RCUTORTURE_RDR_RCU_2;
if (!IS_ENABLED(CONFIG_PREEMPT_RCU))
mask |= RCUTORTURE_RDR_PREEMPT | RCUTORTURE_RDR_SCHED;
if (IS_ENABLED(CONFIG_PREEMPT_RT) && softirq_count())
mask |= RCUTORTURE_RDR_BH | RCUTORTURE_RDR_RBH;
WARN_ONCE(cur_ops->readlock_nesting && !(curstate & mask) &&
cur_ops->readlock_nesting() > 0, ROEC_ARGS);
}
static void rcutorture_one_extend(int *readstate, int newstate, struct torture_random_state *trsp,
struct rt_read_seg *rtrsp)
{
bool first;
unsigned long flags;
int idxnew1 = -1;
int idxnew2 = -1;
int idxold1 = *readstate;
int idxold2 = idxold1;
int statesnew = ~*readstate & newstate;
int statesold = *readstate & ~newstate;
first = idxold1 == 0;
WARN_ON_ONCE(idxold2 < 0);
WARN_ON_ONCE(idxold2 & ~(RCUTORTURE_RDR_ALLBITS | RCUTORTURE_RDR_UPDOWN));
rcutorture_one_extend_check("before change", idxold1, statesnew, statesold);
rtrsp->rt_readstate = newstate;
if (statesnew & RCUTORTURE_RDR_BH)
local_bh_disable();
if (statesnew & RCUTORTURE_RDR_RBH)
rcu_read_lock_bh();
if (statesnew & RCUTORTURE_RDR_IRQ)
local_irq_disable();
if (statesnew & RCUTORTURE_RDR_PREEMPT)
preempt_disable();
if (statesnew & RCUTORTURE_RDR_SCHED)
rcu_read_lock_sched();
if (statesnew & RCUTORTURE_RDR_RCU_1)
idxnew1 = (cur_ops->readlock() << RCUTORTURE_RDR_SHIFT_1) & RCUTORTURE_RDR_MASK_1;
if (statesnew & RCUTORTURE_RDR_RCU_2)
idxnew2 = (cur_ops->readlock() << RCUTORTURE_RDR_SHIFT_2) & RCUTORTURE_RDR_MASK_2;
rcutorture_one_extend_check("during change", idxold1 | statesnew, statesnew, statesold);
if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_CPU)) {
int cpu = raw_smp_processor_id();
rtrsp->rt_cpu = cpu;
if (!first) {
rtrsp[-1].rt_end_cpu = cpu;
if (cur_ops->reader_blocked)
rtrsp[-1].rt_preempted = cur_ops->reader_blocked();
}
}
if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_GP) && cur_ops->gather_gp_seqs) {
rtrsp->rt_gp_seq = cur_ops->gather_gp_seqs();
rtrsp->rt_ts = ktime_get_mono_fast_ns();
if (!first)
rtrsp[-1].rt_gp_seq_end = rtrsp->rt_gp_seq;
}
if (statesold & RCUTORTURE_RDR_IRQ)
local_irq_enable();
if (statesold & RCUTORTURE_RDR_PREEMPT)
preempt_enable();
if (statesold & RCUTORTURE_RDR_SCHED)
rcu_read_unlock_sched();
if (statesold & RCUTORTURE_RDR_BH)
local_bh_enable();
if (statesold & RCUTORTURE_RDR_RBH)
rcu_read_unlock_bh();
if (statesold & RCUTORTURE_RDR_RCU_2) {
cur_ops->readunlock((idxold2 & RCUTORTURE_RDR_MASK_2) >> RCUTORTURE_RDR_SHIFT_2);
WARN_ON_ONCE(idxnew2 != -1);
idxold2 = 0;
}
if (statesold & RCUTORTURE_RDR_RCU_1) {
bool lockit;
lockit = !cur_ops->no_pi_lock && !statesnew && !(torture_random(trsp) & 0xffff);
if (lockit)
raw_spin_lock_irqsave(¤t->pi_lock, flags);
cur_ops->readunlock((idxold1 & RCUTORTURE_RDR_MASK_1) >> RCUTORTURE_RDR_SHIFT_1);
WARN_ON_ONCE(idxnew1 != -1);
idxold1 = 0;
if (lockit)
raw_spin_unlock_irqrestore(¤t->pi_lock, flags);
}
if (statesold & RCUTORTURE_RDR_UPDOWN) {
cur_ops->up_read((idxold1 & RCUTORTURE_RDR_MASK_1) >> RCUTORTURE_RDR_SHIFT_1);
WARN_ON_ONCE(idxnew1 != -1);
idxold1 = 0;
}
if ((statesnew || statesold) && *readstate && newstate)
cur_ops->read_delay(trsp, rtrsp);
if (idxnew1 == -1)
idxnew1 = idxold1 & RCUTORTURE_RDR_MASK_1;
WARN_ON_ONCE(idxnew1 < 0);
if (idxnew2 == -1)
idxnew2 = idxold2 & RCUTORTURE_RDR_MASK_2;
WARN_ON_ONCE(idxnew2 < 0);
*readstate = idxnew1 | idxnew2 | newstate;
WARN_ON_ONCE(*readstate < 0);
if (WARN_ON_ONCE(*readstate & ~RCUTORTURE_RDR_ALLBITS))
pr_info("Unexpected readstate value of %#x\n", *readstate);
rcutorture_one_extend_check("after change", *readstate, statesnew, statesold);
}
static int rcutorture_extend_mask_max(void)
{
int mask;
WARN_ON_ONCE(extendables & ~RCUTORTURE_MAX_EXTEND);
mask = extendables & RCUTORTURE_MAX_EXTEND & cur_ops->extendables;
mask = mask | RCUTORTURE_RDR_RCU_1 | RCUTORTURE_RDR_RCU_2;
return mask;
}
static int
rcutorture_extend_mask(int oldmask, struct torture_random_state *trsp)
{
int mask = rcutorture_extend_mask_max();
unsigned long randmask1 = torture_random(trsp);
unsigned long randmask2 = randmask1 >> 3;
unsigned long preempts = RCUTORTURE_RDR_PREEMPT | RCUTORTURE_RDR_SCHED;
unsigned long preempts_irq = preempts | RCUTORTURE_RDR_IRQ;
unsigned long bhs = RCUTORTURE_RDR_BH | RCUTORTURE_RDR_RBH;
WARN_ON_ONCE(mask >> RCUTORTURE_RDR_SHIFT_1);
if (!(randmask1 & 0x7))
mask = mask & randmask2;
else
mask = mask & (1 << (randmask2 % RCUTORTURE_RDR_NBITS));
if (!(mask & RCUTORTURE_RDR_RCU_1) && (mask & RCUTORTURE_RDR_RCU_2)) {
if (oldmask & RCUTORTURE_RDR_RCU_1)
mask &= ~RCUTORTURE_RDR_RCU_2;
else
mask |= RCUTORTURE_RDR_RCU_1;
}
if (mask & RCUTORTURE_RDR_IRQ)
mask |= oldmask & bhs;
if (IS_ENABLED(CONFIG_PREEMPT_RT)) {
if (oldmask & preempts_irq)
mask &= ~bhs;
if ((oldmask | mask) & preempts_irq)
mask |= oldmask & bhs;
}
return mask ?: RCUTORTURE_RDR_RCU_1;
}
static struct rt_read_seg *
rcutorture_loop_extend(int *readstate, struct torture_random_state *trsp, struct rt_read_seg *rtrsp)
{
int i;
int j;
int mask = rcutorture_extend_mask_max();
WARN_ON_ONCE(!*readstate);
if (!((mask - 1) & mask))
return rtrsp;
i = torture_random(trsp);
i = ((i | (i >> 3)) & RCUTORTURE_RDR_MAX_LOOPS) + 1;
for (j = 0; j < i; j++) {
mask = rcutorture_extend_mask(*readstate, trsp);
WARN_ON_ONCE(mask & RCUTORTURE_RDR_UPDOWN);
rcutorture_one_extend(readstate, mask, trsp, &rtrsp[j]);
}
return &rtrsp[j];
}
struct rcu_torture_one_read_state {
bool checkpolling;
unsigned long cookie;
struct rcu_gp_oldstate cookie_full;
unsigned long started;
struct rcu_torture *p;
int readstate;
struct rt_read_seg rtseg[RCUTORTURE_RDR_MAX_SEGS];
struct rt_read_seg *rtrsp;
unsigned long long ts;
};
static void init_rcu_torture_one_read_state(struct rcu_torture_one_read_state *rtorsp,
struct torture_random_state *trsp)
{
memset(rtorsp, 0, sizeof(*rtorsp));
rtorsp->checkpolling = !(torture_random(trsp) & 0xfff);
rtorsp->rtrsp = &rtorsp->rtseg[0];
}
static bool rcu_torture_one_read_start(struct rcu_torture_one_read_state *rtorsp,
struct torture_random_state *trsp, long myid)
{
if (rtorsp->checkpolling) {
if (cur_ops->get_gp_state && cur_ops->poll_gp_state)
rtorsp->cookie = cur_ops->get_gp_state();
if (cur_ops->get_gp_state_full && cur_ops->poll_gp_state_full)
cur_ops->get_gp_state_full(&rtorsp->cookie_full);
}
rtorsp->started = cur_ops->get_gp_seq();
rtorsp->ts = rcu_trace_clock_local();
rtorsp->p = rcu_dereference_check(rcu_torture_current,
!cur_ops->readlock_held || cur_ops->readlock_held() ||
(rtorsp->readstate & RCUTORTURE_RDR_UPDOWN));
if (rtorsp->p == NULL) {
rcutorture_one_extend(&rtorsp->readstate, 0, trsp, rtorsp->rtrsp);
return false;
}
if (rtorsp->p->rtort_mbtest == 0)
atomic_inc(&n_rcu_torture_mberror);
rcu_torture_reader_do_mbchk(myid, rtorsp->p, trsp);
return true;
}
static void rcu_torture_one_read_end(struct rcu_torture_one_read_state *rtorsp,
struct torture_random_state *trsp)
{
int i;
unsigned long completed;
int pipe_count;
bool preempted = false;
struct rt_read_seg *rtrsp1;
preempt_disable();
pipe_count = READ_ONCE(rtorsp->p->rtort_pipe_count);
if (pipe_count > RCU_TORTURE_PIPE_LEN) {
pipe_count = RCU_TORTURE_PIPE_LEN;
}
completed = cur_ops->get_gp_seq();
if (pipe_count > 1) {
do_trace_rcu_torture_read(cur_ops->name, &rtorsp->p->rtort_rcu,
rtorsp->ts, rtorsp->started, completed);
rcu_ftrace_dump(DUMP_ALL);
}
__this_cpu_inc(rcu_torture_count[pipe_count]);
completed = rcutorture_seq_diff(completed, rtorsp->started);
if (completed > RCU_TORTURE_PIPE_LEN) {
completed = RCU_TORTURE_PIPE_LEN;
}
__this_cpu_inc(rcu_torture_batch[completed]);
preempt_enable();
if (rtorsp->checkpolling) {
if (cur_ops->get_gp_state && cur_ops->poll_gp_state)
WARN_ONCE(cur_ops->poll_gp_state(rtorsp->cookie),
"%s: Cookie check 2 failed %s(%d) %lu->%lu\n",
__func__,
rcu_torture_writer_state_getname(),
rcu_torture_writer_state,
rtorsp->cookie, cur_ops->get_gp_state());
if (cur_ops->get_gp_state_full && cur_ops->poll_gp_state_full)
WARN_ONCE(cur_ops->poll_gp_state_full(&rtorsp->cookie_full),
"%s: Cookie check 6 failed %s(%d) online %*pbl\n",
__func__,
rcu_torture_writer_state_getname(),
rcu_torture_writer_state,
cpumask_pr_args(cpu_online_mask));
}
if (cur_ops->reader_blocked)
preempted = cur_ops->reader_blocked();
rcutorture_one_extend(&rtorsp->readstate, 0, trsp, rtorsp->rtrsp);
WARN_ON_ONCE(rtorsp->readstate);
WARN_ON_ONCE(leakpointer && READ_ONCE(rtorsp->p->rtort_pipe_count) > 1);
if ((pipe_count > 1 || completed > 1) && !xchg(&err_segs_recorded, 1)) {
i = 0;
for (rtrsp1 = &rtorsp->rtseg[0]; rtrsp1 < rtorsp->rtrsp; rtrsp1++)
err_segs[i++] = *rtrsp1;
rt_read_nsegs = i;
rt_read_preempted = preempted;
}
}
static bool rcu_torture_one_read(struct torture_random_state *trsp, long myid)
{
int newstate;
struct rcu_torture_one_read_state rtors;
WARN_ON_ONCE(!rcu_is_watching());
init_rcu_torture_one_read_state(&rtors, trsp);
newstate = rcutorture_extend_mask(rtors.readstate, trsp);
WARN_ON_ONCE(newstate & RCUTORTURE_RDR_UPDOWN);
rcutorture_one_extend(&rtors.readstate, newstate, trsp, rtors.rtrsp++);
if (!rcu_torture_one_read_start(&rtors, trsp, myid))
return false;
rtors.rtrsp = rcutorture_loop_extend(&rtors.readstate, trsp, rtors.rtrsp);
rcu_torture_one_read_end(&rtors, trsp);
return true;
}
static DEFINE_TORTURE_RANDOM_PERCPU(rcu_torture_timer_rand);
static void rcu_torture_timer(struct timer_list *unused)
{
WARN_ON_ONCE(!in_serving_softirq());
WARN_ON_ONCE(in_hardirq());
WARN_ON_ONCE(in_nmi());
atomic_long_inc(&n_rcu_torture_timers);
(void)rcu_torture_one_read(this_cpu_ptr(&rcu_torture_timer_rand), -1);
if (cur_ops->call) {
struct rcu_head *rhp = kmalloc_obj(*rhp, GFP_NOWAIT);
if (rhp)
cur_ops->call(rhp, rcu_torture_timer_cb);
}
}
static int
rcu_torture_reader(void *arg)
{
unsigned long lastsleep = jiffies;
long myid = (long)arg;
int mynumonline = myid;
DEFINE_TORTURE_RANDOM(rand);
struct timer_list t;
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);
tick_dep_set_task(current, TICK_DEP_BIT_RCU);
do {
if (irqreader && cur_ops->irq_capable) {
if (!timer_pending(&t))
mod_timer(&t, jiffies + 1);
}
if (!rcu_torture_one_read(&rand, myid) && !torture_must_stop())
schedule_timeout_interruptible(HZ);
if (time_after(jiffies, lastsleep) && !torture_must_stop()) {
torture_hrtimeout_us(500, 1000, &rand);
lastsleep = jiffies + 10;
}
while (!torture_must_stop() &&
(torture_num_online_cpus() < mynumonline || !rcu_inkernel_boot_has_ended()))
schedule_timeout_interruptible(HZ / 5);
stutter_wait("rcu_torture_reader");
} while (!torture_must_stop());
if (irqreader && cur_ops->irq_capable) {
timer_delete_sync(&t);
timer_destroy_on_stack(&t);
}
tick_dep_clear_task(current, TICK_DEP_BIT_RCU);
torture_kthread_stopping("rcu_torture_reader");
return 0;
}
struct rcu_torture_one_read_state_updown {
struct hrtimer rtorsu_hrt;
bool rtorsu_inuse;
ktime_t rtorsu_kt;
int rtorsu_cpu;
unsigned long rtorsu_j;
unsigned long rtorsu_ndowns;
unsigned long rtorsu_nups;
unsigned long rtorsu_nmigrates;
struct torture_random_state rtorsu_trs;
struct rcu_torture_one_read_state rtorsu_rtors;
};
static struct rcu_torture_one_read_state_updown *updownreaders;
static DEFINE_TORTURE_RANDOM(rcu_torture_updown_rand);
static int rcu_torture_updown(void *arg);
static enum hrtimer_restart rcu_torture_updown_hrt(struct hrtimer *hrtp)
{
int cpu = raw_smp_processor_id();
struct rcu_torture_one_read_state_updown *rtorsup;
rtorsup = container_of(hrtp, struct rcu_torture_one_read_state_updown, rtorsu_hrt);
rcu_torture_one_read_end(&rtorsup->rtorsu_rtors, &rtorsup->rtorsu_trs);
WARN_ONCE(rtorsup->rtorsu_nups >= rtorsup->rtorsu_ndowns, "%s: Up without matching down #%zu.\n", __func__, rtorsup - updownreaders);
WRITE_ONCE(rtorsup->rtorsu_nups, rtorsup->rtorsu_nups + 1);
WRITE_ONCE(rtorsup->rtorsu_nmigrates,
rtorsup->rtorsu_nmigrates + (cpu != rtorsup->rtorsu_cpu));
smp_store_release(&rtorsup->rtorsu_inuse, false);
return HRTIMER_NORESTART;
}
static int rcu_torture_updown_init(void)
{
int i;
struct torture_random_state *rand = &rcu_torture_updown_rand;
int ret;
if (n_up_down < 0)
return 0;
if (!srcu_torture_have_up_down()) {
VERBOSE_TOROUT_STRING("rcu_torture_updown_init: Disabling up/down reader tests due to lack of primitives");
return 0;
}
updownreaders = kzalloc_objs(*updownreaders, n_up_down);
if (!updownreaders) {
VERBOSE_TOROUT_STRING("rcu_torture_updown_init: Out of memory, disabling up/down reader tests");
return -ENOMEM;
}
for (i = 0; i < n_up_down; i++) {
init_rcu_torture_one_read_state(&updownreaders[i].rtorsu_rtors, rand);
hrtimer_setup(&updownreaders[i].rtorsu_hrt, rcu_torture_updown_hrt, CLOCK_MONOTONIC,
HRTIMER_MODE_REL | HRTIMER_MODE_HARD);
torture_random_init(&updownreaders[i].rtorsu_trs);
init_rcu_torture_one_read_state(&updownreaders[i].rtorsu_rtors,
&updownreaders[i].rtorsu_trs);
}
ret = torture_create_kthread(rcu_torture_updown, rand, updown_task);
if (ret) {
kfree(updownreaders);
updownreaders = NULL;
}
return ret;
}
static void rcu_torture_updown_cleanup(void)
{
struct rcu_torture_one_read_state_updown *rtorsup;
for (rtorsup = updownreaders; rtorsup < &updownreaders[n_up_down]; rtorsup++) {
if (!smp_load_acquire(&rtorsup->rtorsu_inuse))
continue;
if (hrtimer_cancel(&rtorsup->rtorsu_hrt) || WARN_ON_ONCE(rtorsup->rtorsu_inuse)) {
rcu_torture_one_read_end(&rtorsup->rtorsu_rtors, &rtorsup->rtorsu_trs);
WARN_ONCE(rtorsup->rtorsu_nups >= rtorsup->rtorsu_ndowns, "%s: Up without matching down #%zu.\n", __func__, rtorsup - updownreaders);
WRITE_ONCE(rtorsup->rtorsu_nups, rtorsup->rtorsu_nups + 1);
smp_store_release(&rtorsup->rtorsu_inuse, false);
}
}
kfree(updownreaders);
updownreaders = NULL;
}
static void rcu_torture_updown_one(struct rcu_torture_one_read_state_updown *rtorsup)
{
int idx;
int rawidx;
ktime_t t;
init_rcu_torture_one_read_state(&rtorsup->rtorsu_rtors, &rtorsup->rtorsu_trs);
rawidx = cur_ops->down_read();
WRITE_ONCE(rtorsup->rtorsu_ndowns, rtorsup->rtorsu_ndowns + 1);
idx = (rawidx << RCUTORTURE_RDR_SHIFT_1) & RCUTORTURE_RDR_MASK_1;
rtorsup->rtorsu_rtors.readstate = idx | RCUTORTURE_RDR_UPDOWN;
rtorsup->rtorsu_rtors.rtrsp++;
rtorsup->rtorsu_cpu = raw_smp_processor_id();
if (!rcu_torture_one_read_start(&rtorsup->rtorsu_rtors, &rtorsup->rtorsu_trs, -1)) {
WARN_ONCE(rtorsup->rtorsu_nups >= rtorsup->rtorsu_ndowns, "%s: Up without matching down #%zu.\n", __func__, rtorsup - updownreaders);
WRITE_ONCE(rtorsup->rtorsu_nups, rtorsup->rtorsu_nups + 1);
schedule_timeout_idle(HZ);
return;
}
smp_store_release(&rtorsup->rtorsu_inuse, true);
t = torture_random(&rtorsup->rtorsu_trs) & 0xfffff;
if (t < 10 * 1000)
t = 200 * 1000 * 1000;
hrtimer_start(&rtorsup->rtorsu_hrt, t, HRTIMER_MODE_REL | HRTIMER_MODE_HARD);
smp_mb();
rtorsup->rtorsu_j = jiffies;
rtorsup->rtorsu_kt = t;
}
static int
rcu_torture_updown(void *arg)
{
unsigned long j;
struct rcu_torture_one_read_state_updown *rtorsup;
VERBOSE_TOROUT_STRING("rcu_torture_updown task started");
do {
for (rtorsup = updownreaders; rtorsup < &updownreaders[n_up_down]; rtorsup++) {
if (torture_must_stop())
break;
j = smp_load_acquire(&jiffies);
if (smp_load_acquire(&rtorsup->rtorsu_inuse)) {
WARN_ONCE(time_after(j, rtorsup->rtorsu_j + 1 + HZ * 10),
"hrtimer queued at jiffies %lu for %lld ns took %lu jiffies\n", rtorsup->rtorsu_j, rtorsup->rtorsu_kt, j - rtorsup->rtorsu_j);
continue;
}
rcu_torture_updown_one(rtorsup);
}
torture_hrtimeout_ms(1, 1000, &rcu_torture_updown_rand);
stutter_wait("rcu_torture_updown");
} while (!torture_must_stop());
rcu_torture_updown_cleanup();
torture_kthread_stopping("rcu_torture_updown");
return 0;
}
static int rcu_nocb_toggle(void *arg)
{
int cpu;
int maxcpu = -1;
int oldnice = task_nice(current);
long r;
DEFINE_TORTURE_RANDOM(rand);
ktime_t toggle_delay;
unsigned long toggle_fuzz;
ktime_t toggle_interval = ms_to_ktime(nocbs_toggle);
VERBOSE_TOROUT_STRING("rcu_nocb_toggle task started");
while (!rcu_inkernel_boot_has_ended())
schedule_timeout_interruptible(HZ / 10);
for_each_possible_cpu(cpu)
maxcpu = cpu;
WARN_ON(maxcpu < 0);
if (toggle_interval > ULONG_MAX)
toggle_fuzz = ULONG_MAX >> 3;
else
toggle_fuzz = toggle_interval >> 3;
if (toggle_fuzz <= 0)
toggle_fuzz = NSEC_PER_USEC;
do {
r = torture_random(&rand);
cpu = (r >> 1) % (maxcpu + 1);
if (r & 0x1) {
rcu_nocb_cpu_offload(cpu);
atomic_long_inc(&n_nocb_offload);
} else {
rcu_nocb_cpu_deoffload(cpu);
atomic_long_inc(&n_nocb_deoffload);
}
toggle_delay = torture_random(&rand) % toggle_fuzz + toggle_interval;
set_current_state(TASK_INTERRUPTIBLE);
schedule_hrtimeout(&toggle_delay, HRTIMER_MODE_REL);
if (stutter_wait("rcu_nocb_toggle"))
sched_set_normal(current, oldnice);
} while (!torture_must_stop());
torture_kthread_stopping("rcu_nocb_toggle");
return 0;
}
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 };
long n_gpwraps = 0;
unsigned long ndowns = 0;
unsigned long nunexpired = 0;
unsigned long nmigrates = 0;
unsigned long nups = 0;
struct rcu_torture *rtcp;
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] += READ_ONCE(per_cpu(rcu_torture_count, cpu)[i]);
batchsummary[i] += READ_ONCE(per_cpu(rcu_torture_batch, cpu)[i]);
}
if (cur_ops->get_gpwrap_count)
n_gpwraps += cur_ops->get_gpwrap_count(cpu);
}
if (updownreaders) {
for (i = 0; i < n_up_down; i++) {
ndowns += READ_ONCE(updownreaders[i].rtorsu_ndowns);
nups += READ_ONCE(updownreaders[i].rtorsu_nups);
nunexpired += READ_ONCE(updownreaders[i].rtorsu_inuse);
nmigrates += READ_ONCE(updownreaders[i].rtorsu_nmigrates);
}
}
for (i = RCU_TORTURE_PIPE_LEN; i >= 0; i--) {
if (pipesummary[i] != 0)
break;
}
pr_alert("%s%s ", torture_type, TORTURE_FLAG);
rtcp = rcu_access_pointer(rcu_torture_current);
pr_cont("rtc: %p %s: %lu tfle: %d rta: %d rtaf: %d rtf: %d ",
rtcp,
rtcp && !rcu_stall_is_suppressed_at_boot() ? "ver" : "VER",
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 rtmbkf: %d/%d rtbe: %ld rtbke: %ld ",
atomic_read(&n_rcu_torture_mberror),
atomic_read(&n_rcu_torture_mbchk_fail), atomic_read(&n_rcu_torture_mbchk_tries),
n_rcu_torture_barrier_error,
n_rcu_torture_boost_ktrerror);
pr_cont("rtbf: %ld rtb: %ld nt: %ld ",
n_rcu_torture_boost_failure,
n_rcu_torture_boosts,
atomic_long_read(&n_rcu_torture_timers));
if (updownreaders)
pr_cont("ndowns: %lu nups: %lu nhrt: %lu nmigrates: %lu ", ndowns, nups, nunexpired, nmigrates);
torture_onoff_stats();
pr_cont("barrier: %ld/%ld:%ld ",
data_race(n_barrier_successes),
data_race(n_barrier_attempts),
data_race(n_rcu_torture_barrier_error));
pr_cont("read-exits: %ld ", data_race(n_read_exits));
pr_cont("nocb-toggles: %ld:%ld ",
atomic_long_read(&n_nocb_offload), atomic_long_read(&n_nocb_deoffload));
pr_cont("gpwraps: %ld\n", n_gpwraps);
pr_alert("%s%s ", torture_type, TORTURE_FLAG);
if (atomic_read(&n_rcu_torture_mberror) ||
atomic_read(&n_rcu_torture_mbchk_fail) ||
n_rcu_torture_barrier_error || n_rcu_torture_boost_ktrerror ||
n_rcu_torture_boost_failure || i > 1) {
pr_cont("%s", "!!! ");
atomic_inc(&n_rcu_torture_error);
WARN_ON_ONCE(atomic_read(&n_rcu_torture_mberror));
WARN_ON_ONCE(atomic_read(&n_rcu_torture_mbchk_fail));
WARN_ON_ONCE(n_rcu_torture_barrier_error);
WARN_ON_ONCE(n_rcu_torture_boost_ktrerror);
WARN_ON_ONCE(n_rcu_torture_boost_failure);
WARN_ON_ONCE(i > 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_access_pointer(rcu_torture_current) &&
!rcu_stall_is_suppressed() &&
rcu_inkernel_boot_has_ended()) {
int __maybe_unused flags = 0;
unsigned long __maybe_unused gp_seq = 0;
if (cur_ops->get_gp_data)
cur_ops->get_gp_data(&flags, &gp_seq);
wtp = READ_ONCE(writer_task);
pr_alert("??? Writer stall state %s(%d) g%lu f%#x ->state %#x cpu %d\n",
rcu_torture_writer_state_getname(),
rcu_torture_writer_state, gp_seq, flags,
wtp == NULL ? ~0U : wtp->__state,
wtp == NULL ? -1 : (int)task_cpu(wtp));
if (!splatted && wtp) {
sched_show_task(wtp);
splatted = true;
}
if (cur_ops->gp_kthread_dbg)
cur_ops->gp_kthread_dbg();
rcu_ftrace_dump(DUMP_ALL);
}
rtcv_snap = rcu_torture_current_version;
}
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 void rcu_torture_mem_dump_obj(void)
{
struct rcu_head *rhp;
struct kmem_cache *kcp;
static int z;
kcp = kmem_cache_create("rcuscale", 136, 8, SLAB_STORE_USER, NULL);
if (WARN_ON_ONCE(!kcp))
return;
rhp = kmem_cache_alloc(kcp, GFP_KERNEL);
if (WARN_ON_ONCE(!rhp)) {
kmem_cache_destroy(kcp);
return;
}
pr_alert("mem_dump_obj() slab test: rcu_torture_stats = %px, &rhp = %px, rhp = %px, &z = %px\n", stats_task, &rhp, rhp, &z);
pr_alert("mem_dump_obj(ZERO_SIZE_PTR):");
mem_dump_obj(ZERO_SIZE_PTR);
pr_alert("mem_dump_obj(NULL):");
mem_dump_obj(NULL);
pr_alert("mem_dump_obj(%px):", &rhp);
mem_dump_obj(&rhp);
pr_alert("mem_dump_obj(%px):", rhp);
mem_dump_obj(rhp);
pr_alert("mem_dump_obj(%px):", &rhp->func);
mem_dump_obj(&rhp->func);
pr_alert("mem_dump_obj(%px):", &z);
mem_dump_obj(&z);
kmem_cache_free(kcp, rhp);
kmem_cache_destroy(kcp);
rhp = kmalloc_obj(*rhp);
if (WARN_ON_ONCE(!rhp))
return;
pr_alert("mem_dump_obj() kmalloc test: rcu_torture_stats = %px, &rhp = %px, rhp = %px\n", stats_task, &rhp, rhp);
pr_alert("mem_dump_obj(kmalloc %px):", rhp);
mem_dump_obj(rhp);
pr_alert("mem_dump_obj(kmalloc %px):", &rhp->func);
mem_dump_obj(&rhp->func);
kfree(rhp);
rhp = vmalloc(4096);
if (WARN_ON_ONCE(!rhp))
return;
pr_alert("mem_dump_obj() vmalloc test: rcu_torture_stats = %px, &rhp = %px, rhp = %px\n", stats_task, &rhp, rhp);
pr_alert("mem_dump_obj(vmalloc %px):", rhp);
mem_dump_obj(rhp);
pr_alert("mem_dump_obj(vmalloc %px):", &rhp->func);
mem_dump_obj(&rhp->func);
vfree(rhp);
}
static 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 test_boost_holdoff=%d shutdown_secs=%d "
"stall_cpu=%d stall_cpu_holdoff=%d stall_cpu_irqsoff=%d "
"stall_cpu_block=%d stall_cpu_repeat=%d "
"n_barrier_cbs=%d "
"onoff_interval=%d onoff_holdoff=%d "
"read_exit_delay=%d read_exit_burst=%d "
"reader_flavor=%x "
"nocbs_nthreads=%d nocbs_toggle=%d "
"test_nmis=%d "
"preempt_duration=%d preempt_interval=%d n_up_down=%d\n",
torture_type, tag, nrealreaders, nrealfakewriters,
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, test_boost_holdoff, shutdown_secs,
stall_cpu, stall_cpu_holdoff, stall_cpu_irqsoff,
stall_cpu_block, stall_cpu_repeat,
n_barrier_cbs,
onoff_interval, onoff_holdoff,
read_exit_delay, read_exit_burst,
reader_flavor,
nocbs_nthreads, nocbs_toggle,
test_nmis,
preempt_duration, preempt_interval, n_up_down);
}
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;
rcu_torture_enable_rt_throttle();
mutex_unlock(&boost_mutex);
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;
if (IS_BUILTIN(CONFIG_RCU_TORTURE_TEST)) {
struct sched_param sp;
struct task_struct *t;
t = per_cpu(ksoftirqd, cpu);
WARN_ON_ONCE(!t);
sp.sched_priority = 2;
sched_setscheduler_nocheck(t, SCHED_FIFO, &sp);
#ifdef CONFIG_IRQ_FORCED_THREADING
if (force_irqthreads()) {
t = per_cpu(ktimerd, cpu);
WARN_ON_ONCE(!t);
sp.sched_priority = 2;
sched_setscheduler_nocheck(t, SCHED_FIFO, &sp);
}
#endif
}
mutex_lock(&boost_mutex);
rcu_torture_disable_rt_throttle();
VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task");
boost_tasks[cpu] = kthread_run_on_cpu(rcu_torture_boost, NULL,
cpu, "rcu_torture_boost_%u");
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;
}
mutex_unlock(&boost_mutex);
return 0;
}
static int rcu_torture_stall_nf(struct notifier_block *nb, unsigned long v, void *ptr)
{
pr_info("%s: v=%lu, duration=%lu.\n", __func__, v, (unsigned long)ptr);
return NOTIFY_OK;
}
static struct notifier_block rcu_torture_stall_block = {
.notifier_call = rcu_torture_stall_nf,
};
static void rcu_torture_stall_one(int rep, int irqsoff)
{
int idx;
unsigned long stop_at;
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() && stall_gp_kthread > 0) {
VERBOSE_TOROUT_STRING("rcu_torture_stall begin GP stall");
rcu_gp_set_torture_wait(stall_gp_kthread * HZ);
for (idx = 0; idx < stall_gp_kthread + 2; idx++) {
if (kthread_should_stop())
break;
schedule_timeout_uninterruptible(HZ);
}
}
if (!kthread_should_stop() && stall_cpu > 0) {
VERBOSE_TOROUT_STRING("rcu_torture_stall begin CPU stall");
stop_at = ktime_get_seconds() + stall_cpu;
idx = cur_ops->readlock();
if (irqsoff)
local_irq_disable();
else if (!stall_cpu_block)
preempt_disable();
pr_alert("%s start stall episode %d on CPU %d.\n",
__func__, rep + 1, raw_smp_processor_id());
while (ULONG_CMP_LT((unsigned long)ktime_get_seconds(), stop_at) &&
!kthread_should_stop())
if (stall_cpu_block) {
#ifdef CONFIG_PREEMPTION
preempt_schedule();
#else
schedule_timeout_uninterruptible(HZ);
#endif
} else if (stall_no_softlockup) {
touch_softlockup_watchdog();
}
if (irqsoff)
local_irq_enable();
else if (!stall_cpu_block)
preempt_enable();
cur_ops->readunlock(idx);
}
}
static int rcu_torture_stall(void *args)
{
int i;
int repeat = stall_cpu_repeat;
int ret;
VERBOSE_TOROUT_STRING("rcu_torture_stall task started");
if (repeat < 0) {
repeat = 0;
WARN_ON_ONCE(IS_BUILTIN(CONFIG_RCU_TORTURE_TEST));
}
if (rcu_cpu_stall_notifiers) {
ret = rcu_stall_chain_notifier_register(&rcu_torture_stall_block);
if (ret)
pr_info("%s: rcu_stall_chain_notifier_register() returned %d, %sexpected.\n",
__func__, ret, !IS_ENABLED(CONFIG_RCU_STALL_COMMON) ? "un" : "");
}
for (i = 0; i <= repeat; i++) {
if (kthread_should_stop())
break;
rcu_torture_stall_one(i, i == 0 ? stall_cpu_irqsoff : 0);
}
pr_alert("%s end.\n", __func__);
if (rcu_cpu_stall_notifiers && !ret) {
ret = rcu_stall_chain_notifier_unregister(&rcu_torture_stall_block);
if (ret)
pr_info("%s: rcu_stall_chain_notifier_unregister() returned %d.\n", __func__, ret);
}
torture_shutdown_absorb("rcu_torture_stall");
while (!kthread_should_stop())
schedule_timeout_interruptible(10 * HZ);
return 0;
}
static int __init rcu_torture_stall_init(void)
{
if (stall_cpu <= 0 && stall_gp_kthread <= 0)
return 0;
return torture_create_kthread(rcu_torture_stall, NULL, stall_task);
}
struct fwd_cb_state {
struct rcu_head rh;
int stop;
};
static void rcu_torture_fwd_prog_cb(struct rcu_head *rhp)
{
struct fwd_cb_state *fcsp = container_of(rhp, struct fwd_cb_state, rh);
if (READ_ONCE(fcsp->stop)) {
WRITE_ONCE(fcsp->stop, 2);
return;
}
cur_ops->call(&fcsp->rh, rcu_torture_fwd_prog_cb);
}
struct rcu_fwd_cb {
struct rcu_head rh;
struct rcu_fwd_cb *rfc_next;
struct rcu_fwd *rfc_rfp;
int rfc_gps;
};
#define MAX_FWD_CB_JIFFIES (8 * HZ)
#define MIN_FWD_CB_LAUNDERS 3
#define MIN_FWD_CBS_LAUNDERED 100
#define FWD_CBS_HIST_DIV 10
#define N_LAUNDERS_HIST (2 * MAX_FWD_CB_JIFFIES / (HZ / FWD_CBS_HIST_DIV))
struct rcu_launder_hist {
long n_launders;
unsigned long launder_gp_seq;
};
struct rcu_fwd {
spinlock_t rcu_fwd_lock;
struct rcu_fwd_cb *rcu_fwd_cb_head;
struct rcu_fwd_cb **rcu_fwd_cb_tail;
long n_launders_cb;
unsigned long rcu_fwd_startat;
struct rcu_launder_hist n_launders_hist[N_LAUNDERS_HIST];
unsigned long rcu_launder_gp_seq_start;
int rcu_fwd_id;
};
static DEFINE_MUTEX(rcu_fwd_mutex);
static struct rcu_fwd *rcu_fwds;
static unsigned long rcu_fwd_seq;
static atomic_long_t rcu_fwd_max_cbs;
static bool rcu_fwd_emergency_stop;
static void rcu_torture_fwd_cb_hist(struct rcu_fwd *rfp)
{
unsigned long gps;
unsigned long gps_old;
int i;
int j;
for (i = ARRAY_SIZE(rfp->n_launders_hist) - 1; i > 0; i--)
if (rfp->n_launders_hist[i].n_launders > 0)
break;
pr_alert("%s: Callback-invocation histogram %d (duration %lu jiffies):",
__func__, rfp->rcu_fwd_id, jiffies - rfp->rcu_fwd_startat);
gps_old = rfp->rcu_launder_gp_seq_start;
for (j = 0; j <= i; j++) {
gps = rfp->n_launders_hist[j].launder_gp_seq;
pr_cont(" %ds/%d: %ld:%ld",
j + 1, FWD_CBS_HIST_DIV,
rfp->n_launders_hist[j].n_launders,
rcutorture_seq_diff(gps, gps_old));
gps_old = gps;
}
pr_cont("\n");
}
static void rcu_torture_fwd_cb_cr(struct rcu_head *rhp)
{
unsigned long flags;
int i;
struct rcu_fwd_cb *rfcp = container_of(rhp, struct rcu_fwd_cb, rh);
struct rcu_fwd_cb **rfcpp;
struct rcu_fwd *rfp = rfcp->rfc_rfp;
rfcp->rfc_next = NULL;
rfcp->rfc_gps++;
spin_lock_irqsave(&rfp->rcu_fwd_lock, flags);
rfcpp = rfp->rcu_fwd_cb_tail;
rfp->rcu_fwd_cb_tail = &rfcp->rfc_next;
smp_store_release(rfcpp, rfcp);
WRITE_ONCE(rfp->n_launders_cb, rfp->n_launders_cb + 1);
i = ((jiffies - rfp->rcu_fwd_startat) / (HZ / FWD_CBS_HIST_DIV));
if (i >= ARRAY_SIZE(rfp->n_launders_hist))
i = ARRAY_SIZE(rfp->n_launders_hist) - 1;
rfp->n_launders_hist[i].n_launders++;
rfp->n_launders_hist[i].launder_gp_seq = cur_ops->get_gp_seq();
spin_unlock_irqrestore(&rfp->rcu_fwd_lock, flags);
}
static void rcu_torture_fwd_prog_cond_resched(unsigned long iter)
{
if (IS_ENABLED(CONFIG_PREEMPTION) && IS_ENABLED(CONFIG_NO_HZ_FULL)) {
if (need_resched() || (iter & 0xfff))
schedule();
return;
}
cond_resched();
}
static unsigned long rcu_torture_fwd_prog_cbfree(struct rcu_fwd *rfp)
{
unsigned long flags;
unsigned long freed = 0;
struct rcu_fwd_cb *rfcp;
for (;;) {
spin_lock_irqsave(&rfp->rcu_fwd_lock, flags);
rfcp = rfp->rcu_fwd_cb_head;
if (!rfcp) {
spin_unlock_irqrestore(&rfp->rcu_fwd_lock, flags);
break;
}
rfp->rcu_fwd_cb_head = rfcp->rfc_next;
if (!rfp->rcu_fwd_cb_head)
rfp->rcu_fwd_cb_tail = &rfp->rcu_fwd_cb_head;
spin_unlock_irqrestore(&rfp->rcu_fwd_lock, flags);
kfree(rfcp);
freed++;
rcu_torture_fwd_prog_cond_resched(freed);
if (tick_nohz_full_enabled()) {
local_irq_save(flags);
rcu_momentary_eqs();
local_irq_restore(flags);
}
}
return freed;
}
static void rcu_torture_fwd_prog_nr(struct rcu_fwd *rfp,
int *tested, int *tested_tries)
{
unsigned long cver;
unsigned long dur;
struct fwd_cb_state fcs;
unsigned long gps;
int idx;
int sd;
int sd4;
bool selfpropcb = false;
unsigned long stopat;
static DEFINE_TORTURE_RANDOM(trs);
pr_alert("%s: Starting forward-progress test %d\n", __func__, rfp->rcu_fwd_id);
if (!cur_ops->sync)
return;
if (cur_ops->call && cur_ops->cb_barrier) {
init_rcu_head_on_stack(&fcs.rh);
selfpropcb = true;
}
atomic_inc(&rcu_fwd_cb_nodelay);
cur_ops->sync();
if (selfpropcb) {
WRITE_ONCE(fcs.stop, 0);
cur_ops->call(&fcs.rh, rcu_torture_fwd_prog_cb);
}
cver = READ_ONCE(rcu_torture_current_version);
gps = cur_ops->get_gp_seq();
sd = cur_ops->stall_dur() + 1;
sd4 = (sd + fwd_progress_div - 1) / fwd_progress_div;
dur = sd4 + torture_random(&trs) % (sd - sd4);
WRITE_ONCE(rfp->rcu_fwd_startat, jiffies);
stopat = rfp->rcu_fwd_startat + dur;
while (time_before(jiffies, stopat) &&
!shutdown_time_arrived() &&
!READ_ONCE(rcu_fwd_emergency_stop) && !torture_must_stop()) {
idx = cur_ops->readlock();
udelay(10);
cur_ops->readunlock(idx);
if (!fwd_progress_need_resched || need_resched())
cond_resched();
}
(*tested_tries)++;
if (!time_before(jiffies, stopat) &&
!shutdown_time_arrived() &&
!READ_ONCE(rcu_fwd_emergency_stop) && !torture_must_stop()) {
(*tested)++;
cver = READ_ONCE(rcu_torture_current_version) - cver;
gps = rcutorture_seq_diff(cur_ops->get_gp_seq(), gps);
WARN_ON(!cver && gps < 2);
pr_alert("%s: %d Duration %ld cver %ld gps %ld\n", __func__,
rfp->rcu_fwd_id, dur, cver, gps);
}
if (selfpropcb) {
WRITE_ONCE(fcs.stop, 1);
cur_ops->sync();
pr_alert("%s: Waiting for CBs: %pS() %d\n", __func__, cur_ops->cb_barrier, rfp->rcu_fwd_id);
cur_ops->cb_barrier();
}
if (selfpropcb) {
WARN_ON(READ_ONCE(fcs.stop) != 2);
destroy_rcu_head_on_stack(&fcs.rh);
}
schedule_timeout_uninterruptible(HZ / 10);
atomic_dec(&rcu_fwd_cb_nodelay);
}
static void rcu_torture_fwd_prog_cr(struct rcu_fwd *rfp)
{
unsigned long cver;
unsigned long flags;
unsigned long gps;
int i;
long n_launders;
long n_launders_cb_snap;
long n_launders_sa;
long n_max_cbs;
long n_max_gps;
struct rcu_fwd_cb *rfcp;
struct rcu_fwd_cb *rfcpn;
unsigned long stopat;
unsigned long stoppedat;
pr_alert("%s: Starting forward-progress test %d\n", __func__, rfp->rcu_fwd_id);
if (READ_ONCE(rcu_fwd_emergency_stop))
return;
if (!cur_ops->call)
return;
atomic_inc(&rcu_fwd_cb_nodelay);
cur_ops->sync();
WRITE_ONCE(rfp->rcu_fwd_startat, jiffies);
stopat = rfp->rcu_fwd_startat + MAX_FWD_CB_JIFFIES;
n_launders = 0;
rfp->n_launders_cb = 0;
n_launders_sa = 0;
n_max_cbs = 0;
n_max_gps = 0;
for (i = 0; i < ARRAY_SIZE(rfp->n_launders_hist); i++)
rfp->n_launders_hist[i].n_launders = 0;
cver = READ_ONCE(rcu_torture_current_version);
gps = cur_ops->get_gp_seq();
rfp->rcu_launder_gp_seq_start = gps;
tick_dep_set_task(current, TICK_DEP_BIT_RCU);
while (time_before(jiffies, stopat) &&
!shutdown_time_arrived() &&
!READ_ONCE(rcu_fwd_emergency_stop) && !torture_must_stop()) {
rfcp = READ_ONCE(rfp->rcu_fwd_cb_head);
rfcpn = NULL;
if (rfcp)
rfcpn = READ_ONCE(rfcp->rfc_next);
if (rfcpn) {
if (rfcp->rfc_gps >= MIN_FWD_CB_LAUNDERS &&
++n_max_gps >= MIN_FWD_CBS_LAUNDERED)
break;
rfp->rcu_fwd_cb_head = rfcpn;
n_launders++;
n_launders_sa++;
} else if (!cur_ops->cbflood_max || cur_ops->cbflood_max > n_max_cbs) {
rfcp = kmalloc_obj(*rfcp);
if (WARN_ON_ONCE(!rfcp)) {
schedule_timeout_interruptible(1);
continue;
}
n_max_cbs++;
n_launders_sa = 0;
rfcp->rfc_gps = 0;
rfcp->rfc_rfp = rfp;
} else {
rfcp = NULL;
}
if (rfcp)
cur_ops->call(&rfcp->rh, rcu_torture_fwd_cb_cr);
rcu_torture_fwd_prog_cond_resched(n_launders + n_max_cbs);
if (tick_nohz_full_enabled()) {
local_irq_save(flags);
rcu_momentary_eqs();
local_irq_restore(flags);
}
}
stoppedat = jiffies;
n_launders_cb_snap = READ_ONCE(rfp->n_launders_cb);
cver = READ_ONCE(rcu_torture_current_version) - cver;
gps = rcutorture_seq_diff(cur_ops->get_gp_seq(), gps);
pr_alert("%s: Waiting for CBs: %pS() %d\n", __func__, cur_ops->cb_barrier, rfp->rcu_fwd_id);
cur_ops->cb_barrier();
(void)rcu_torture_fwd_prog_cbfree(rfp);
if (!torture_must_stop() && !READ_ONCE(rcu_fwd_emergency_stop) &&
!shutdown_time_arrived()) {
if (WARN_ON(n_max_gps < MIN_FWD_CBS_LAUNDERED) && cur_ops->gp_kthread_dbg)
cur_ops->gp_kthread_dbg();
pr_alert("%s Duration %lu barrier: %lu pending %ld n_launders: %ld n_launders_sa: %ld n_max_gps: %ld n_max_cbs: %ld cver %ld gps %ld #online %u\n",
__func__,
stoppedat - rfp->rcu_fwd_startat, jiffies - stoppedat,
n_launders + n_max_cbs - n_launders_cb_snap,
n_launders, n_launders_sa,
n_max_gps, n_max_cbs, cver, gps, num_online_cpus());
atomic_long_add(n_max_cbs, &rcu_fwd_max_cbs);
mutex_lock(&rcu_fwd_mutex);
rcu_torture_fwd_cb_hist(rfp);
mutex_unlock(&rcu_fwd_mutex);
}
schedule_timeout_uninterruptible(HZ);
tick_dep_clear_task(current, TICK_DEP_BIT_RCU);
atomic_dec(&rcu_fwd_cb_nodelay);
}
static int rcutorture_oom_notify(struct notifier_block *self,
unsigned long notused, void *nfreed)
{
int i;
long ncbs;
struct rcu_fwd *rfp;
mutex_lock(&rcu_fwd_mutex);
rfp = rcu_fwds;
if (!rfp) {
mutex_unlock(&rcu_fwd_mutex);
return NOTIFY_OK;
}
WARN(1, "%s invoked upon OOM during forward-progress testing.\n",
__func__);
for (i = 0; i < fwd_progress; i++) {
rcu_torture_fwd_cb_hist(&rfp[i]);
rcu_fwd_progress_check(1 + (jiffies - READ_ONCE(rfp[i].rcu_fwd_startat)) / 2);
}
WRITE_ONCE(rcu_fwd_emergency_stop, true);
smp_mb();
ncbs = 0;
for (i = 0; i < fwd_progress; i++)
ncbs += rcu_torture_fwd_prog_cbfree(&rfp[i]);
pr_info("%s: Freed %lu RCU callbacks.\n", __func__, ncbs);
cur_ops->cb_barrier();
ncbs = 0;
for (i = 0; i < fwd_progress; i++)
ncbs += rcu_torture_fwd_prog_cbfree(&rfp[i]);
pr_info("%s: Freed %lu RCU callbacks.\n", __func__, ncbs);
cur_ops->cb_barrier();
ncbs = 0;
for (i = 0; i < fwd_progress; i++)
ncbs += rcu_torture_fwd_prog_cbfree(&rfp[i]);
pr_info("%s: Freed %lu RCU callbacks.\n", __func__, ncbs);
smp_mb();
(*(unsigned long *)nfreed)++;
pr_info("%s returning after OOM processing.\n", __func__);
mutex_unlock(&rcu_fwd_mutex);
return NOTIFY_OK;
}
static struct notifier_block rcutorture_oom_nb = {
.notifier_call = rcutorture_oom_notify
};
static int rcu_torture_fwd_prog(void *args)
{
bool firsttime = true;
long max_cbs;
int oldnice = task_nice(current);
unsigned long oldseq = READ_ONCE(rcu_fwd_seq);
struct rcu_fwd *rfp = args;
int tested = 0;
int tested_tries = 0;
VERBOSE_TOROUT_STRING("rcu_torture_fwd_progress task started");
while (!rcu_inkernel_boot_has_ended())
schedule_timeout_interruptible(HZ / 10);
rcu_bind_current_to_nocb();
if (!IS_ENABLED(CONFIG_SMP) || !IS_ENABLED(CONFIG_RCU_BOOST))
set_user_nice(current, MAX_NICE);
do {
if (!rfp->rcu_fwd_id) {
schedule_timeout_interruptible(fwd_progress_holdoff * HZ);
WRITE_ONCE(rcu_fwd_emergency_stop, false);
if (!firsttime) {
max_cbs = atomic_long_xchg(&rcu_fwd_max_cbs, 0);
pr_alert("%s n_max_cbs: %ld\n", __func__, max_cbs);
}
firsttime = false;
WRITE_ONCE(rcu_fwd_seq, rcu_fwd_seq + 1);
} else {
while (READ_ONCE(rcu_fwd_seq) == oldseq && !torture_must_stop())
schedule_timeout_interruptible(HZ / 20);
oldseq = READ_ONCE(rcu_fwd_seq);
}
pr_alert("%s: Starting forward-progress test %d\n", __func__, rfp->rcu_fwd_id);
if (rcu_inkernel_boot_has_ended() && torture_num_online_cpus() > rfp->rcu_fwd_id)
rcu_torture_fwd_prog_cr(rfp);
if ((cur_ops->stall_dur && cur_ops->stall_dur() > 0) &&
(!IS_ENABLED(CONFIG_TINY_RCU) ||
(rcu_inkernel_boot_has_ended() &&
torture_num_online_cpus() > rfp->rcu_fwd_id)))
rcu_torture_fwd_prog_nr(rfp, &tested, &tested_tries);
if (stutter_wait("rcu_torture_fwd_prog"))
sched_set_normal(current, oldnice);
} while (!torture_must_stop());
if (!rfp->rcu_fwd_id) {
WARN_ON(!tested && tested_tries >= 5);
pr_alert("%s: tested %d tested_tries %d\n", __func__, tested, tested_tries);
}
torture_kthread_stopping("rcu_torture_fwd_prog");
return 0;
}
static int __init rcu_torture_fwd_prog_init(void)
{
int i;
int ret = 0;
struct rcu_fwd *rfp;
if (!fwd_progress)
return 0;
if (fwd_progress >= nr_cpu_ids) {
VERBOSE_TOROUT_STRING("rcu_torture_fwd_prog_init: Limiting fwd_progress to # CPUs.\n");
fwd_progress = nr_cpu_ids;
} else if (fwd_progress < 0) {
fwd_progress = nr_cpu_ids;
}
if ((!cur_ops->sync && !cur_ops->call) ||
(!cur_ops->cbflood_max && (!cur_ops->stall_dur || cur_ops->stall_dur() <= 0)) ||
cur_ops == &rcu_busted_ops) {
VERBOSE_TOROUT_STRING("rcu_torture_fwd_prog_init: Disabled, unsupported by RCU flavor under test");
fwd_progress = 0;
return 0;
}
if (stall_cpu > 0 || (preempt_duration > 0 && IS_ENABLED(CONFIG_RCU_NOCB_CPU))) {
VERBOSE_TOROUT_STRING("rcu_torture_fwd_prog_init: Disabled, conflicts with CPU-stall and/or preemption testing");
fwd_progress = 0;
if (IS_MODULE(CONFIG_RCU_TORTURE_TEST))
return -EINVAL;
WARN_ON(1);
return 0;
}
if (fwd_progress_holdoff <= 0)
fwd_progress_holdoff = 1;
if (fwd_progress_div <= 0)
fwd_progress_div = 4;
rfp = kzalloc_objs(*rfp, fwd_progress);
fwd_prog_tasks = kzalloc_objs(*fwd_prog_tasks, fwd_progress);
if (!rfp || !fwd_prog_tasks) {
kfree(rfp);
kfree(fwd_prog_tasks);
fwd_prog_tasks = NULL;
fwd_progress = 0;
return -ENOMEM;
}
for (i = 0; i < fwd_progress; i++) {
spin_lock_init(&rfp[i].rcu_fwd_lock);
rfp[i].rcu_fwd_cb_tail = &rfp[i].rcu_fwd_cb_head;
rfp[i].rcu_fwd_id = i;
}
mutex_lock(&rcu_fwd_mutex);
rcu_fwds = rfp;
mutex_unlock(&rcu_fwd_mutex);
register_oom_notifier(&rcutorture_oom_nb);
for (i = 0; i < fwd_progress; i++) {
ret = torture_create_kthread(rcu_torture_fwd_prog, &rcu_fwds[i], fwd_prog_tasks[i]);
if (ret) {
fwd_progress = i;
return ret;
}
}
return 0;
}
static void rcu_torture_fwd_prog_cleanup(void)
{
int i;
struct rcu_fwd *rfp;
if (!rcu_fwds || !fwd_prog_tasks)
return;
for (i = 0; i < fwd_progress; i++)
torture_stop_kthread(rcu_torture_fwd_prog, fwd_prog_tasks[i]);
unregister_oom_notifier(&rcutorture_oom_nb);
mutex_lock(&rcu_fwd_mutex);
rfp = rcu_fwds;
rcu_fwds = NULL;
mutex_unlock(&rcu_fwd_mutex);
kfree(rfp);
kfree(fwd_prog_tasks);
fwd_prog_tasks = NULL;
}
static void rcu_torture_barrier_cbf(struct rcu_head *rcu)
{
atomic_inc(&barrier_cbs_invoked);
}
static int rcu_torture_barrier1cb(void *rcu_void)
{
struct rcu_head *rhp = rcu_void;
cur_ops->call(rhp, rcu_torture_barrier_cbf);
return 0;
}
static int rcu_torture_barrier_cbs(void *arg)
{
long myid = (long)arg;
bool lastphase = false;
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;
if (smp_call_on_cpu(myid, rcu_torture_barrier1cb, &rcu, 1))
cur_ops->call(&rcu, rcu_torture_barrier_cbf);
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;
}
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);
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();
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(1);
i = 0;
do {
if (WARN_ON(i++ > HZ))
i = INT_MIN;
schedule_timeout_interruptible(1);
cur_ops->cb_barrier();
} while (atomic_read(&barrier_cbs_invoked) !=
n_barrier_cbs &&
!torture_must_stop());
smp_mb();
if (!torture_must_stop())
pr_err("Recovered: barrier_cbs_invoked = %d\n",
atomic_read(&barrier_cbs_invoked));
} else {
n_barrier_successes++;
}
schedule_timeout_interruptible(HZ / 10);
} while (!torture_must_stop());
torture_kthread_stopping("rcu_torture_barrier");
return 0;
}
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 =
kzalloc_objs(barrier_cbs_tasks[0], n_barrier_cbs);
barrier_cbs_wq =
kzalloc_objs(barrier_cbs_wq[0], n_barrier_cbs);
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);
}
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 bool rcu_torture_can_boost(void)
{
static int boost_warn_once;
int prio;
if (!(test_boost == 1 && cur_ops->can_boost) && test_boost != 2)
return false;
if (!cur_ops->start_gp_poll || !cur_ops->poll_gp_state)
return false;
prio = rcu_get_gp_kthreads_prio();
if (!prio)
return false;
if (prio < 2) {
if (boost_warn_once == 1)
return false;
pr_alert("%s: WARN: RCU kthread priority too low to test boosting. Skipping RCU boost test. Try passing rcutree.kthread_prio > 1 on the kernel command line.\n", KBUILD_MODNAME);
boost_warn_once = 1;
return false;
}
return true;
}
static bool read_exit_child_stop;
static bool read_exit_child_stopped;
static wait_queue_head_t read_exit_wq;
static int rcu_torture_read_exit_child(void *trsp_in)
{
struct torture_random_state *trsp = trsp_in;
set_user_nice(current, MAX_NICE);
while (!kthread_should_stop())
schedule_timeout_uninterruptible(HZ / 20);
(void)rcu_torture_one_read(trsp, -1);
return 0;
}
static int rcu_torture_read_exit(void *unused)
{
bool errexit = false;
int i;
struct task_struct *tsp;
DEFINE_TORTURE_RANDOM(trs);
set_user_nice(current, MAX_NICE);
VERBOSE_TOROUT_STRING("rcu_torture_read_exit: Start of test");
do {
VERBOSE_TOROUT_STRING("rcu_torture_read_exit: Start of episode");
for (i = 0; i < read_exit_burst; i++) {
if (READ_ONCE(read_exit_child_stop))
break;
stutter_wait("rcu_torture_read_exit");
tsp = kthread_run(rcu_torture_read_exit_child,
&trs, "%s", "rcu_torture_read_exit_child");
if (IS_ERR(tsp)) {
TOROUT_ERRSTRING("out of memory");
errexit = true;
break;
}
cond_resched();
kthread_stop(tsp);
n_read_exits++;
}
VERBOSE_TOROUT_STRING("rcu_torture_read_exit: End of episode");
rcu_barrier();
i = 0;
for (; !errexit && !READ_ONCE(read_exit_child_stop) && i < read_exit_delay; i++)
schedule_timeout_uninterruptible(HZ);
} while (!errexit && !READ_ONCE(read_exit_child_stop));
smp_store_release(&read_exit_child_stopped, true);
smp_mb();
wake_up(&read_exit_wq);
while (!torture_must_stop())
schedule_timeout_uninterruptible(HZ / 20);
torture_kthread_stopping("rcu_torture_read_exit");
return 0;
}
static int rcu_torture_read_exit_init(void)
{
if (read_exit_burst <= 0)
return 0;
init_waitqueue_head(&read_exit_wq);
read_exit_child_stop = false;
read_exit_child_stopped = false;
return torture_create_kthread(rcu_torture_read_exit, NULL,
read_exit_task);
}
static void rcu_torture_read_exit_cleanup(void)
{
if (!read_exit_task)
return;
WRITE_ONCE(read_exit_child_stop, true);
smp_mb();
wait_event(read_exit_wq, smp_load_acquire(&read_exit_child_stopped));
torture_stop_kthread(rcutorture_read_exit, read_exit_task);
}
static void rcutorture_test_nmis(int n)
{
#if IS_BUILTIN(CONFIG_RCU_TORTURE_TEST)
int cpu;
int dumpcpu;
int i;
for (i = 0; i < n; i++) {
preempt_disable();
cpu = smp_processor_id();
dumpcpu = cpu + 1;
if (dumpcpu >= nr_cpu_ids)
dumpcpu = 0;
pr_alert("%s: CPU %d invoking dump_cpu_task(%d)\n", __func__, cpu, dumpcpu);
dump_cpu_task(dumpcpu);
preempt_enable();
schedule_timeout_uninterruptible(15 * HZ);
}
#else
WARN_ONCE(n, "Non-zero rcutorture.test_nmis=%d permitted only when rcutorture is built in.\n", test_nmis);
#endif
}
static int rcu_torture_preempt(void *unused)
{
int cpu = -1;
DEFINE_TORTURE_RANDOM(rand);
schedule_timeout_idle(stall_cpu_holdoff);
do {
torture_hrtimeout_ms(preempt_interval, 100, &rand);
cpu = cpumask_next(cpu, cpu_online_mask);
if (cpu >= nr_cpu_ids)
cpu = cpumask_next(-1, cpu_online_mask);
WARN_ON_ONCE(cpu >= nr_cpu_ids);
if (torture_sched_setaffinity(current->pid, cpumask_of(cpu), false))
continue;
sched_set_fifo(current);
torture_sched_setaffinity(current->pid, cpu_present_mask, true);
mdelay(preempt_duration);
sched_set_normal(current, 0);
stutter_wait("rcu_torture_preempt");
} while (!torture_must_stop());
torture_kthread_stopping("rcu_torture_preempt");
return 0;
}
static enum cpuhp_state rcutor_hp;
static struct hrtimer gpwrap_lag_timer;
static bool gpwrap_lag_active;
static enum hrtimer_restart rcu_gpwrap_lag_timer(struct hrtimer *timer)
{
ktime_t next_delay;
if (gpwrap_lag_active) {
pr_alert("rcu-torture: Disabling gpwrap lag (value=0)\n");
cur_ops->set_gpwrap_lag(0);
gpwrap_lag_active = false;
next_delay = ktime_set((gpwrap_lag_cycle_mins - gpwrap_lag_active_mins) * 60, 0);
} else {
pr_alert("rcu-torture: Enabling gpwrap lag (value=%d)\n", gpwrap_lag_gps);
cur_ops->set_gpwrap_lag(gpwrap_lag_gps);
gpwrap_lag_active = true;
next_delay = ktime_set(gpwrap_lag_active_mins * 60, 0);
}
if (torture_must_stop_irq())
return HRTIMER_NORESTART;
hrtimer_forward_now(timer, next_delay);
return HRTIMER_RESTART;
}
static int rcu_gpwrap_lag_init(void)
{
if (!gpwrap_lag)
return 0;
if (gpwrap_lag_cycle_mins <= 0 || gpwrap_lag_active_mins <= 0) {
pr_alert("rcu-torture: lag timing parameters must be positive\n");
return -EINVAL;
}
hrtimer_setup(&gpwrap_lag_timer, rcu_gpwrap_lag_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
gpwrap_lag_active = false;
hrtimer_start(&gpwrap_lag_timer,
ktime_set((gpwrap_lag_cycle_mins - gpwrap_lag_active_mins) * 60, 0), HRTIMER_MODE_REL);
return 0;
}
static void rcu_gpwrap_lag_cleanup(void)
{
hrtimer_cancel(&gpwrap_lag_timer);
cur_ops->set_gpwrap_lag(0);
gpwrap_lag_active = false;
}
static void
rcu_torture_cleanup(void)
{
int firsttime;
int flags = 0;
unsigned long gp_seq = 0;
int i;
int j;
if (torture_cleanup_begin()) {
if (cur_ops->cb_barrier != NULL) {
pr_info("%s: Invoking %pS().\n", __func__, cur_ops->cb_barrier);
cur_ops->cb_barrier();
}
if (cur_ops->gp_slow_unregister)
cur_ops->gp_slow_unregister(NULL);
return;
}
if (!cur_ops) {
torture_cleanup_end();
return;
}
rcutorture_test_nmis(test_nmis);
if (cur_ops->gp_kthread_dbg)
cur_ops->gp_kthread_dbg();
torture_stop_kthread(rcu_torture_preempt, preempt_task);
rcu_torture_read_exit_cleanup();
rcu_torture_barrier_cleanup();
rcu_torture_fwd_prog_cleanup();
torture_stop_kthread(rcu_torture_stall, stall_task);
torture_stop_kthread(rcu_torture_writer, writer_task);
if (nocb_tasks) {
for (i = 0; i < nrealnocbers; i++)
torture_stop_kthread(rcu_nocb_toggle, nocb_tasks[i]);
kfree(nocb_tasks);
nocb_tasks = NULL;
}
if (updown_task) {
torture_stop_kthread(rcu_torture_updown, updown_task);
updown_task = NULL;
}
if (reader_tasks) {
for (i = 0; i < nrealreaders; i++)
torture_stop_kthread(rcu_torture_reader,
reader_tasks[i]);
kfree(reader_tasks);
reader_tasks = NULL;
}
kfree(rcu_torture_reader_mbchk);
rcu_torture_reader_mbchk = NULL;
if (fakewriter_tasks) {
for (i = 0; i < nrealfakewriters; i++)
torture_stop_kthread(rcu_torture_fakewriter,
fakewriter_tasks[i]);
kfree(fakewriter_tasks);
fakewriter_tasks = NULL;
}
if (cur_ops->get_gp_data)
cur_ops->get_gp_data(&flags, &gp_seq);
pr_alert("%s: End-test grace-period state: g%ld f%#x total-gps=%ld\n",
cur_ops->name, (long)gp_seq, flags,
rcutorture_seq_diff(gp_seq, start_gp_seq));
torture_stop_kthread(rcu_torture_stats, stats_task);
torture_stop_kthread(rcu_torture_fqs, fqs_task);
if (rcu_torture_can_boost() && rcutor_hp >= 0)
cpuhp_remove_state(rcutor_hp);
if (cur_ops->cb_barrier != NULL) {
pr_info("%s: Invoking %pS().\n", __func__, cur_ops->cb_barrier);
cur_ops->cb_barrier();
}
if (cur_ops->cleanup != NULL)
cur_ops->cleanup();
rcu_torture_mem_dump_obj();
rcu_torture_stats_print();
if (err_segs_recorded) {
pr_alert("Failure/close-call rcutorture reader segments:\n");
if (rt_read_nsegs == 0)
pr_alert("\t: No segments recorded!!!\n");
firsttime = 1;
for (i = 0; i < rt_read_nsegs; i++) {
if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_GP))
pr_alert("\t%lluus ", div64_u64(err_segs[i].rt_ts, 1000ULL));
else
pr_alert("\t");
pr_cont("%d: %#4x", i, err_segs[i].rt_readstate);
if (err_segs[i].rt_delay_jiffies != 0) {
pr_cont("%s%ldjiffies", firsttime ? "" : "+",
err_segs[i].rt_delay_jiffies);
firsttime = 0;
}
if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_CPU)) {
pr_cont(" CPU %2d", err_segs[i].rt_cpu);
if (err_segs[i].rt_cpu != err_segs[i].rt_end_cpu)
pr_cont("->%-2d", err_segs[i].rt_end_cpu);
else
pr_cont(" ...");
}
if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_GP) &&
cur_ops->gather_gp_seqs && cur_ops->format_gp_seqs) {
char buf1[20+1];
char buf2[20+1];
char sepchar = '-';
cur_ops->format_gp_seqs(err_segs[i].rt_gp_seq,
buf1, ARRAY_SIZE(buf1));
cur_ops->format_gp_seqs(err_segs[i].rt_gp_seq_end,
buf2, ARRAY_SIZE(buf2));
if (err_segs[i].rt_gp_seq == err_segs[i].rt_gp_seq_end) {
if (buf2[0]) {
for (j = 0; buf2[j]; j++)
buf2[j] = '.';
if (j)
buf2[j - 1] = ' ';
}
sepchar = ' ';
}
pr_cont(" %s%c%s", buf1, sepchar, buf2);
}
if (err_segs[i].rt_delay_ms != 0) {
pr_cont(" %s%ldms", firsttime ? "" : "+",
err_segs[i].rt_delay_ms);
firsttime = 0;
}
if (err_segs[i].rt_delay_us != 0) {
pr_cont(" %s%ldus", firsttime ? "" : "+",
err_segs[i].rt_delay_us);
firsttime = 0;
}
pr_cont("%s", err_segs[i].rt_preempted ? " preempted" : "");
if (err_segs[i].rt_readstate & RCUTORTURE_RDR_BH)
pr_cont(" BH");
if (err_segs[i].rt_readstate & RCUTORTURE_RDR_IRQ)
pr_cont(" IRQ");
if (err_segs[i].rt_readstate & RCUTORTURE_RDR_PREEMPT)
pr_cont(" PREEMPT");
if (err_segs[i].rt_readstate & RCUTORTURE_RDR_RBH)
pr_cont(" RBH");
if (err_segs[i].rt_readstate & RCUTORTURE_RDR_SCHED)
pr_cont(" SCHED");
if (err_segs[i].rt_readstate & RCUTORTURE_RDR_RCU_1)
pr_cont(" RCU_1");
if (err_segs[i].rt_readstate & RCUTORTURE_RDR_RCU_2)
pr_cont(" RCU_2");
pr_cont("\n");
}
if (rt_read_preempted)
pr_alert("\tReader was preempted.\n");
}
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();
if (cur_ops->gp_slow_unregister)
cur_ops->gp_slow_unregister(NULL);
if (gpwrap_lag && cur_ops->set_gpwrap_lag)
rcu_gpwrap_lag_cleanup();
}
static void rcu_torture_leak_cb(struct rcu_head *rhp)
{
}
static void rcu_torture_err_cb(struct rcu_head *rhp)
{
pr_alert("%s: duplicated callback was invoked.\n", KBUILD_MODNAME);
}
static void rcu_test_debug_objects(void)
{
struct rcu_head rh1;
struct rcu_head rh2;
int idx;
if (!IS_ENABLED(CONFIG_DEBUG_OBJECTS_RCU_HEAD)) {
pr_alert("%s: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_%s()\n",
KBUILD_MODNAME, cur_ops->name);
return;
}
if (WARN_ON_ONCE(cur_ops->debug_objects &&
(!cur_ops->call || !cur_ops->cb_barrier)))
return;
struct rcu_head *rhp = kmalloc_obj(*rhp);
init_rcu_head_on_stack(&rh1);
init_rcu_head_on_stack(&rh2);
pr_alert("%s: WARN: Duplicate call_%s() test starting.\n", KBUILD_MODNAME, cur_ops->name);
idx = cur_ops->readlock();
cur_ops->call(&rh1, rcu_torture_leak_cb);
cur_ops->call(&rh2, rcu_torture_leak_cb);
cur_ops->call(&rh2, rcu_torture_err_cb);
if (rhp) {
cur_ops->call(rhp, rcu_torture_leak_cb);
cur_ops->call(rhp, rcu_torture_err_cb);
}
cur_ops->readunlock(idx);
cur_ops->cb_barrier();
pr_alert("%s: WARN: Duplicate call_%s() test complete.\n", KBUILD_MODNAME, cur_ops->name);
destroy_rcu_head_on_stack(&rh1);
destroy_rcu_head_on_stack(&rh2);
kfree(rhp);
}
static void rcutorture_sync(void)
{
static unsigned long n;
if (cur_ops->sync && !(++n & 0xfff))
cur_ops->sync();
}
static DEFINE_MUTEX(mut0);
static DEFINE_MUTEX(mut1);
static DEFINE_MUTEX(mut2);
static DEFINE_MUTEX(mut3);
static DEFINE_MUTEX(mut4);
static DEFINE_MUTEX(mut5);
static DEFINE_MUTEX(mut6);
static DEFINE_MUTEX(mut7);
static DEFINE_MUTEX(mut8);
static DEFINE_MUTEX(mut9);
static DECLARE_RWSEM(rwsem0);
static DECLARE_RWSEM(rwsem1);
static DECLARE_RWSEM(rwsem2);
static DECLARE_RWSEM(rwsem3);
static DECLARE_RWSEM(rwsem4);
static DECLARE_RWSEM(rwsem5);
static DECLARE_RWSEM(rwsem6);
static DECLARE_RWSEM(rwsem7);
static DECLARE_RWSEM(rwsem8);
static DECLARE_RWSEM(rwsem9);
DEFINE_STATIC_SRCU(srcu0);
DEFINE_STATIC_SRCU(srcu1);
DEFINE_STATIC_SRCU(srcu2);
DEFINE_STATIC_SRCU(srcu3);
DEFINE_STATIC_SRCU(srcu4);
DEFINE_STATIC_SRCU(srcu5);
DEFINE_STATIC_SRCU(srcu6);
DEFINE_STATIC_SRCU(srcu7);
DEFINE_STATIC_SRCU(srcu8);
DEFINE_STATIC_SRCU(srcu9);
static int srcu_lockdep_next(const char *f, const char *fl, const char *fs, const char *fu, int i,
int cyclelen, int deadlock)
{
int j = i + 1;
if (j >= cyclelen)
j = deadlock ? 0 : -1;
if (j >= 0)
pr_info("%s: %s(%d), %s(%d), %s(%d)\n", f, fl, i, fs, j, fu, i);
else
pr_info("%s: %s(%d), %s(%d)\n", f, fl, i, fu, i);
return j;
}
static void rcu_torture_init_srcu_lockdep(void)
{
int cyclelen;
int deadlock;
bool err = false;
int i;
int j;
int idx;
struct mutex *muts[] = { &mut0, &mut1, &mut2, &mut3, &mut4,
&mut5, &mut6, &mut7, &mut8, &mut9 };
struct rw_semaphore *rwsems[] = { &rwsem0, &rwsem1, &rwsem2, &rwsem3, &rwsem4,
&rwsem5, &rwsem6, &rwsem7, &rwsem8, &rwsem9 };
struct srcu_struct *srcus[] = { &srcu0, &srcu1, &srcu2, &srcu3, &srcu4,
&srcu5, &srcu6, &srcu7, &srcu8, &srcu9 };
int testtype;
if (!test_srcu_lockdep)
return;
deadlock = test_srcu_lockdep / 1000;
testtype = (test_srcu_lockdep / 10) % 100;
cyclelen = test_srcu_lockdep % 10;
WARN_ON_ONCE(ARRAY_SIZE(muts) != ARRAY_SIZE(srcus));
if (WARN_ONCE(deadlock != !!deadlock,
"%s: test_srcu_lockdep=%d and deadlock digit %d must be zero or one.\n",
__func__, test_srcu_lockdep, deadlock))
err = true;
if (WARN_ONCE(cyclelen <= 0,
"%s: test_srcu_lockdep=%d and cycle-length digit %d must be greater than zero.\n",
__func__, test_srcu_lockdep, cyclelen))
err = true;
if (err)
goto err_out;
if (testtype == 0) {
pr_info("%s: test_srcu_lockdep = %05d: SRCU %d-way %sdeadlock.\n",
__func__, test_srcu_lockdep, cyclelen, deadlock ? "" : "non-");
if (deadlock && cyclelen == 1)
pr_info("%s: Expect hang.\n", __func__);
for (i = 0; i < cyclelen; i++) {
j = srcu_lockdep_next(__func__, "srcu_read_lock", "synchronize_srcu",
"srcu_read_unlock", i, cyclelen, deadlock);
idx = srcu_read_lock(srcus[i]);
if (j >= 0)
synchronize_srcu(srcus[j]);
srcu_read_unlock(srcus[i], idx);
}
return;
}
if (testtype == 1) {
pr_info("%s: test_srcu_lockdep = %05d: SRCU/mutex %d-way %sdeadlock.\n",
__func__, test_srcu_lockdep, cyclelen, deadlock ? "" : "non-");
for (i = 0; i < cyclelen; i++) {
pr_info("%s: srcu_read_lock(%d), mutex_lock(%d), mutex_unlock(%d), srcu_read_unlock(%d)\n",
__func__, i, i, i, i);
idx = srcu_read_lock(srcus[i]);
mutex_lock(muts[i]);
mutex_unlock(muts[i]);
srcu_read_unlock(srcus[i], idx);
j = srcu_lockdep_next(__func__, "mutex_lock", "synchronize_srcu",
"mutex_unlock", i, cyclelen, deadlock);
mutex_lock(muts[i]);
if (j >= 0)
synchronize_srcu(srcus[j]);
mutex_unlock(muts[i]);
}
return;
}
if (testtype == 2) {
pr_info("%s: test_srcu_lockdep = %05d: SRCU/rwsem %d-way %sdeadlock.\n",
__func__, test_srcu_lockdep, cyclelen, deadlock ? "" : "non-");
for (i = 0; i < cyclelen; i++) {
pr_info("%s: srcu_read_lock(%d), down_read(%d), up_read(%d), srcu_read_unlock(%d)\n",
__func__, i, i, i, i);
idx = srcu_read_lock(srcus[i]);
down_read(rwsems[i]);
up_read(rwsems[i]);
srcu_read_unlock(srcus[i], idx);
j = srcu_lockdep_next(__func__, "down_write", "synchronize_srcu",
"up_write", i, cyclelen, deadlock);
down_write(rwsems[i]);
if (j >= 0)
synchronize_srcu(srcus[j]);
up_write(rwsems[i]);
}
return;
}
#ifdef CONFIG_TASKS_TRACE_RCU
if (testtype == 3) {
pr_info("%s: test_srcu_lockdep = %05d: SRCU and Tasks Trace RCU %d-way %sdeadlock.\n",
__func__, test_srcu_lockdep, cyclelen, deadlock ? "" : "non-");
if (deadlock && cyclelen == 1)
pr_info("%s: Expect hang.\n", __func__);
for (i = 0; i < cyclelen; i++) {
char *fl = i == 0 ? "rcu_read_lock_trace" : "srcu_read_lock";
char *fs = i == cyclelen - 1 ? "synchronize_rcu_tasks_trace"
: "synchronize_srcu";
char *fu = i == 0 ? "rcu_read_unlock_trace" : "srcu_read_unlock";
j = srcu_lockdep_next(__func__, fl, fs, fu, i, cyclelen, deadlock);
if (i == 0)
rcu_read_lock_trace();
else
idx = srcu_read_lock(srcus[i]);
if (j >= 0) {
if (i == cyclelen - 1)
synchronize_rcu_tasks_trace();
else
synchronize_srcu(srcus[j]);
}
if (i == 0)
rcu_read_unlock_trace();
else
srcu_read_unlock(srcus[i], idx);
}
return;
}
#endif
err_out:
pr_info("%s: test_srcu_lockdep = %05d does nothing.\n", __func__, test_srcu_lockdep);
pr_info("%s: test_srcu_lockdep = DNNL.\n", __func__);
pr_info("%s: D: Deadlock if nonzero.\n", __func__);
pr_info("%s: NN: Test number, 0=SRCU, 1=SRCU/mutex, 2=SRCU/rwsem, 3=SRCU/Tasks Trace RCU.\n", __func__);
pr_info("%s: L: Cycle length.\n", __func__);
if (!IS_ENABLED(CONFIG_TASKS_TRACE_RCU))
pr_info("%s: NN=3 disallowed because kernel is built with CONFIG_TASKS_TRACE_RCU=n\n", __func__);
}
static int __init
rcu_torture_init(void)
{
long i;
int cpu;
int firsterr = 0;
int flags = 0;
unsigned long gp_seq = 0;
static struct rcu_torture_ops *torture_ops[] = {
&rcu_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops, &busted_srcud_ops,
TASKS_OPS TASKS_RUDE_OPS TASKS_TRACING_OPS
&trivial_ops,
};
if (!torture_init_begin(torture_type, verbose))
return -EBUSY;
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_cont(" %s", torture_ops[i]->name);
pr_cont("\n");
firsterr = -EINVAL;
cur_ops = NULL;
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 (nocbs_nthreads != 0 && (cur_ops != &rcu_ops ||
!IS_ENABLED(CONFIG_RCU_NOCB_CPU))) {
pr_alert("rcu-torture types: %s and CONFIG_RCU_NOCB_CPU=%d, nocb toggle disabled.\n",
cur_ops->name, IS_ENABLED(CONFIG_RCU_NOCB_CPU));
nocbs_nthreads = 0;
}
if (cur_ops->init)
cur_ops->init();
rcu_torture_init_srcu_lockdep();
if (nfakewriters >= 0) {
nrealfakewriters = nfakewriters;
} else {
nrealfakewriters = num_online_cpus() - 2 - nfakewriters;
if (nrealfakewriters <= 0)
nrealfakewriters = 1;
}
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");
if (cur_ops->get_gp_data)
cur_ops->get_gp_data(&flags, &gp_seq);
start_gp_seq = gp_seq;
pr_alert("%s: Start-test grace-period state: g%ld f%#x\n",
cur_ops->name, (long)gp_seq, flags);
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);
}
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_mbchk_fail, 0);
atomic_set(&n_rcu_torture_mbchk_tries, 0);
atomic_set(&n_rcu_torture_error, 0);
n_rcu_torture_barrier_error = 0;
n_rcu_torture_boost_ktrerror = 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;
}
}
err_segs_recorded = 0;
rt_read_nsegs = 0;
rcu_torture_write_types();
if (nrealfakewriters > 0) {
fakewriter_tasks = kzalloc_objs(fakewriter_tasks[0],
nrealfakewriters);
if (fakewriter_tasks == NULL) {
TOROUT_ERRSTRING("out of memory");
firsterr = -ENOMEM;
goto unwind;
}
}
for (i = 0; i < nrealfakewriters; i++) {
firsterr = torture_create_kthread(rcu_torture_fakewriter,
NULL, fakewriter_tasks[i]);
if (torture_init_error(firsterr))
goto unwind;
}
reader_tasks = kzalloc_objs(reader_tasks[0], nrealreaders);
rcu_torture_reader_mbchk = kzalloc_objs(*rcu_torture_reader_mbchk,
nrealreaders);
if (!reader_tasks || !rcu_torture_reader_mbchk) {
TOROUT_ERRSTRING("out of memory");
firsterr = -ENOMEM;
goto unwind;
}
for (i = 0; i < nrealreaders; i++) {
rcu_torture_reader_mbchk[i].rtc_chkrdr = -1;
firsterr = torture_create_kthread(rcu_torture_reader, (void *)i,
reader_tasks[i]);
if (torture_init_error(firsterr))
goto unwind;
}
firsterr = torture_create_kthread(rcu_torture_writer, NULL,
writer_task);
if (torture_init_error(firsterr))
goto unwind;
firsterr = rcu_torture_updown_init();
if (torture_init_error(firsterr))
goto unwind;
nrealnocbers = nocbs_nthreads;
if (WARN_ON(nrealnocbers < 0))
nrealnocbers = 1;
if (WARN_ON(nocbs_toggle < 0))
nocbs_toggle = HZ;
if (nrealnocbers > 0) {
nocb_tasks = kzalloc_objs(nocb_tasks[0], nrealnocbers);
if (nocb_tasks == NULL) {
TOROUT_ERRSTRING("out of memory");
firsterr = -ENOMEM;
goto unwind;
}
} else {
nocb_tasks = NULL;
}
for (i = 0; i < nrealnocbers; i++) {
firsterr = torture_create_kthread(rcu_nocb_toggle, NULL, nocb_tasks[i]);
if (torture_init_error(firsterr))
goto unwind;
}
if (stat_interval > 0) {
firsterr = torture_create_kthread(rcu_torture_stats, NULL,
stats_task);
if (torture_init_error(firsterr))
goto unwind;
}
if (test_no_idle_hz && shuffle_interval > 0) {
firsterr = torture_shuffle_init(shuffle_interval * HZ);
if (torture_init_error(firsterr))
goto unwind;
}
if (stutter < 0)
stutter = 0;
if (stutter) {
int t;
t = cur_ops->stall_dur ? cur_ops->stall_dur() : stutter * HZ;
firsterr = torture_stutter_init(stutter * HZ, t);
if (torture_init_error(firsterr))
goto unwind;
}
if (fqs_duration < 0)
fqs_duration = 0;
if (fqs_holdoff < 0)
fqs_holdoff = 0;
if (fqs_duration && fqs_holdoff) {
firsterr = torture_create_kthread(rcu_torture_fqs, NULL,
fqs_task);
if (torture_init_error(firsterr))
goto unwind;
}
if (test_boost_interval < 1)
test_boost_interval = 1;
if (test_boost_duration < 2)
test_boost_duration = 2;
if (rcu_torture_can_boost()) {
boost_starttime = jiffies + test_boost_interval * HZ;
firsterr = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "RCU_TORTURE",
rcutorture_booster_init,
rcutorture_booster_cleanup);
rcutor_hp = firsterr;
if (torture_init_error(firsterr))
goto unwind;
}
shutdown_jiffies = jiffies + shutdown_secs * HZ;
firsterr = torture_shutdown_init(shutdown_secs, rcu_torture_cleanup);
if (torture_init_error(firsterr))
goto unwind;
firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval,
rcutorture_sync);
if (torture_init_error(firsterr))
goto unwind;
firsterr = rcu_torture_stall_init();
if (torture_init_error(firsterr))
goto unwind;
firsterr = rcu_torture_fwd_prog_init();
if (torture_init_error(firsterr))
goto unwind;
firsterr = rcu_torture_barrier_init();
if (torture_init_error(firsterr))
goto unwind;
firsterr = rcu_torture_read_exit_init();
if (torture_init_error(firsterr))
goto unwind;
if (preempt_duration > 0) {
firsterr = torture_create_kthread(rcu_torture_preempt, NULL, preempt_task);
if (torture_init_error(firsterr))
goto unwind;
}
if (object_debug)
rcu_test_debug_objects();
if (cur_ops->gp_slow_register && !WARN_ON_ONCE(!cur_ops->gp_slow_unregister))
cur_ops->gp_slow_register(&rcu_fwd_cb_nodelay);
if (gpwrap_lag && cur_ops->set_gpwrap_lag) {
firsterr = rcu_gpwrap_lag_init();
if (torture_init_error(firsterr))
goto unwind;
}
torture_init_end();
return 0;
unwind:
torture_init_end();
rcu_torture_cleanup();
if (shutdown_secs) {
WARN_ON(!IS_MODULE(CONFIG_RCU_TORTURE_TEST));
kernel_power_off();
}
return firsterr;
}
module_init(rcu_torture_init);
module_exit(rcu_torture_cleanup);
