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Diffstat (limited to 'kernel/rcu/rcutorture.c')
-rw-r--r--kernel/rcu/rcutorture.c84
1 files changed, 60 insertions, 24 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index bb75dbf5c800..2ae8a5e5e99a 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -57,9 +57,9 @@ MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.ibm.com> and Josh Triplett <josh@
/* Bits for ->extendables field, extendables param, and related definitions. */
#define RCUTORTURE_RDR_SHIFT_1 8 /* Put SRCU index in upper bits. */
-#define RCUTORTURE_RDR_MASK_1 (1 << RCUTORTURE_RDR_SHIFT_1)
-#define RCUTORTURE_RDR_SHIFT_2 9 /* Put SRCU index in upper bits. */
-#define RCUTORTURE_RDR_MASK_2 (1 << RCUTORTURE_RDR_SHIFT_2)
+#define RCUTORTURE_RDR_MASK_1 (0xff << RCUTORTURE_RDR_SHIFT_1)
+#define RCUTORTURE_RDR_SHIFT_2 16 /* Put SRCU index in upper bits. */
+#define RCUTORTURE_RDR_MASK_2 (0xff << RCUTORTURE_RDR_SHIFT_2)
#define RCUTORTURE_RDR_BH 0x01 /* Extend readers by disabling bh. */
#define RCUTORTURE_RDR_IRQ 0x02 /* ... disabling interrupts. */
#define RCUTORTURE_RDR_PREEMPT 0x04 /* ... disabling preemption. */
@@ -71,6 +71,9 @@ MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.ibm.com> and Josh Triplett <josh@
#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 /* Maximum reader extensions. */
/* Must be power of two minus one. */
#define RCUTORTURE_RDR_MAX_SEGS (RCUTORTURE_RDR_MAX_LOOPS + 3)
@@ -108,6 +111,7 @@ torture_param(int, nocbs_nthreads, 0, "Number of NOCB toggle threads, 0 to disab
torture_param(int, nocbs_toggle, 1000, "Time between toggling nocb state (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, 0x1, "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.");
@@ -393,6 +397,7 @@ struct rcu_torture_ops {
int slow_gps;
int no_pi_lock;
int debug_objects;
+ int start_poll_irqsoff;
const char *name;
};
@@ -581,6 +586,7 @@ static struct rcu_torture_ops rcu_ops = {
.can_boost = IS_ENABLED(CONFIG_RCU_BOOST),
.extendables = RCUTORTURE_MAX_EXTEND,
.debug_objects = 1,
+ .start_poll_irqsoff = 1,
.name = "rcu"
};
@@ -641,10 +647,25 @@ static void srcu_get_gp_data(int *flags, unsigned long *gp_seq)
static int srcu_torture_read_lock(void)
{
- if (cur_ops == &srcud_ops)
- return srcu_read_lock_nmisafe(srcu_ctlp);
- else
- return srcu_read_lock(srcu_ctlp);
+ int idx;
+ int ret = 0;
+
+ if ((reader_flavor & 0x1) || !(reader_flavor & 0x7)) {
+ idx = srcu_read_lock(srcu_ctlp);
+ WARN_ON_ONCE(idx & ~0x1);
+ ret += idx;
+ }
+ if (reader_flavor & 0x2) {
+ idx = srcu_read_lock_nmisafe(srcu_ctlp);
+ WARN_ON_ONCE(idx & ~0x1);
+ ret += idx << 1;
+ }
+ if (reader_flavor & 0x4) {
+ idx = srcu_read_lock_lite(srcu_ctlp);
+ WARN_ON_ONCE(idx & ~0x1);
+ ret += idx << 2;
+ }
+ return ret;
}
static void
@@ -668,10 +689,13 @@ srcu_read_delay(struct torture_random_state *rrsp, struct rt_read_seg *rtrsp)
static void srcu_torture_read_unlock(int idx)
{
- if (cur_ops == &srcud_ops)
- srcu_read_unlock_nmisafe(srcu_ctlp, idx);
- else
- srcu_read_unlock(srcu_ctlp, idx);
+ WARN_ON_ONCE((reader_flavor && (idx & ~reader_flavor)) || (!reader_flavor && (idx & ~0x1)));
+ if (reader_flavor & 0x4)
+ srcu_read_unlock_lite(srcu_ctlp, (idx & 0x4) >> 2);
+ if (reader_flavor & 0x2)
+ srcu_read_unlock_nmisafe(srcu_ctlp, (idx & 0x2) >> 1);
+ if ((reader_flavor & 0x1) || !(reader_flavor & 0x7))
+ srcu_read_unlock(srcu_ctlp, idx & 0x1);
}
static int torture_srcu_read_lock_held(void)
@@ -1059,8 +1083,13 @@ static bool rcu_torture_boost_failed(unsigned long gp_state, unsigned long *star
// At most one persisted message per boost test.
j = jiffies;
lp = READ_ONCE(last_persist);
- if (time_after(j, lp + mininterval) && cmpxchg(&last_persist, lp, j) == lp)
- pr_info("Boost inversion persisted: No QS from CPU %d\n", cpu);
+ 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; // passed on a technicality
}
VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed");
@@ -1695,14 +1724,22 @@ rcu_torture_fakewriter(void *arg)
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);
@@ -1820,7 +1857,7 @@ static void rcutorture_one_extend(int *readstate, int newstate,
int statesold = *readstate & ~newstate;
WARN_ON_ONCE(idxold2 < 0);
- WARN_ON_ONCE((idxold2 >> RCUTORTURE_RDR_SHIFT_2) > 1);
+ WARN_ON_ONCE(idxold2 & ~RCUTORTURE_RDR_ALLBITS);
rtrsp->rt_readstate = newstate;
/* First, put new protection in place to avoid critical-section gap. */
@@ -1835,9 +1872,9 @@ static void rcutorture_one_extend(int *readstate, int newstate,
if (statesnew & RCUTORTURE_RDR_SCHED)
rcu_read_lock_sched();
if (statesnew & RCUTORTURE_RDR_RCU_1)
- idxnew1 = (cur_ops->readlock() & 0x1) << RCUTORTURE_RDR_SHIFT_1;
+ idxnew1 = (cur_ops->readlock() << RCUTORTURE_RDR_SHIFT_1) & RCUTORTURE_RDR_MASK_1;
if (statesnew & RCUTORTURE_RDR_RCU_2)
- idxnew2 = (cur_ops->readlock() & 0x1) << RCUTORTURE_RDR_SHIFT_2;
+ idxnew2 = (cur_ops->readlock() << RCUTORTURE_RDR_SHIFT_2) & RCUTORTURE_RDR_MASK_2;
/*
* Next, remove old protection, in decreasing order of strength
@@ -1857,7 +1894,7 @@ static void rcutorture_one_extend(int *readstate, int newstate,
if (statesold & RCUTORTURE_RDR_RBH)
rcu_read_unlock_bh();
if (statesold & RCUTORTURE_RDR_RCU_2) {
- cur_ops->readunlock((idxold2 >> RCUTORTURE_RDR_SHIFT_2) & 0x1);
+ cur_ops->readunlock((idxold2 & RCUTORTURE_RDR_MASK_2) >> RCUTORTURE_RDR_SHIFT_2);
WARN_ON_ONCE(idxnew2 != -1);
idxold2 = 0;
}
@@ -1867,7 +1904,7 @@ static void rcutorture_one_extend(int *readstate, int newstate,
lockit = !cur_ops->no_pi_lock && !statesnew && !(torture_random(trsp) & 0xffff);
if (lockit)
raw_spin_lock_irqsave(&current->pi_lock, flags);
- cur_ops->readunlock((idxold1 >> RCUTORTURE_RDR_SHIFT_1) & 0x1);
+ cur_ops->readunlock((idxold1 & RCUTORTURE_RDR_MASK_1) >> RCUTORTURE_RDR_SHIFT_1);
WARN_ON_ONCE(idxnew1 != -1);
idxold1 = 0;
if (lockit)
@@ -1882,16 +1919,13 @@ static void rcutorture_one_extend(int *readstate, int newstate,
if (idxnew1 == -1)
idxnew1 = idxold1 & RCUTORTURE_RDR_MASK_1;
WARN_ON_ONCE(idxnew1 < 0);
- if (WARN_ON_ONCE((idxnew1 >> RCUTORTURE_RDR_SHIFT_1) > 1))
- pr_info("Unexpected idxnew1 value of %#x\n", idxnew1);
if (idxnew2 == -1)
idxnew2 = idxold2 & RCUTORTURE_RDR_MASK_2;
WARN_ON_ONCE(idxnew2 < 0);
- WARN_ON_ONCE((idxnew2 >> RCUTORTURE_RDR_SHIFT_2) > 1);
*readstate = idxnew1 | idxnew2 | newstate;
WARN_ON_ONCE(*readstate < 0);
- if (WARN_ON_ONCE((*readstate >> RCUTORTURE_RDR_SHIFT_2) > 1))
- pr_info("Unexpected idxnew2 value of %#x\n", idxnew2);
+ if (WARN_ON_ONCE(*readstate & ~RCUTORTURE_RDR_ALLBITS))
+ pr_info("Unexpected readstate value of %#x\n", *readstate);
}
/* Return the biggest extendables mask given current RCU and boot parameters. */
@@ -1916,7 +1950,7 @@ rcutorture_extend_mask(int oldmask, struct torture_random_state *trsp)
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);
+ WARN_ON_ONCE(mask >> RCUTORTURE_RDR_SHIFT_1); // Can't have reader idx bits.
/* Mostly only one bit (need preemption!), sometimes lots of bits. */
if (!(randmask1 & 0x7))
mask = mask & randmask2;
@@ -2389,6 +2423,7 @@ rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag)
"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\n",
torture_type, tag, nrealreaders, nfakewriters,
@@ -2401,6 +2436,7 @@ rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag)
n_barrier_cbs,
onoff_interval, onoff_holdoff,
read_exit_delay, read_exit_burst,
+ reader_flavor,
nocbs_nthreads, nocbs_toggle,
test_nmis);
}
generated by cgit (git 2.34.1) at 2025-04-21 09:48:37 +0000