void cpupri_set(struct cpupri *cp, int cpu, int newpri)
{
int *currpri = &cp->cpu_to_pri[cpu];
int oldpri = *currpri;
int do_mb = 0;
newpri = convert_prio(newpri);
BUG_ON(newpri >= CPUPRI_NR_PRIORITIES);
if (newpri == oldpri)
return;
if (likely(newpri != CPUPRI_INVALID)) {
struct cpupri_vec *vec = &cp->pri_to_cpu[newpri];
cpumask_set_cpu(cpu, vec->mask);
smp_mb__before_atomic_inc();
atomic_inc(&(vec)->count);
do_mb = 1;
}
if (likely(oldpri != CPUPRI_INVALID)) {
struct cpupri_vec *vec = &cp->pri_to_cpu[oldpri];
if (do_mb)
smp_mb__after_atomic_inc();
atomic_dec(&(vec)->count);
smp_mb__after_atomic_inc();
cpumask_clear_cpu(cpu, vec->mask);
}
*currpri = newpri;
}
static void rcu_idle_enter_common(struct rcu_dynticks *rdtp, long long oldval)
{
trace_rcu_dyntick("Start", oldval, 0);
if (!is_idle_task(current)) {
struct task_struct *idle = idle_task(smp_processor_id());
trace_rcu_dyntick("Error on entry: not idle task", oldval, 0);
ftrace_dump(DUMP_ALL);
WARN_ONCE(1, "Current pid: %d comm: %s / Idle pid: %d comm: %s",
current->pid, current->comm,
idle->pid, idle->comm);
}
rcu_prepare_for_idle(smp_processor_id());
smp_mb__before_atomic_inc();
atomic_inc(&rdtp->dynticks);
smp_mb__after_atomic_inc();
WARN_ON_ONCE(atomic_read(&rdtp->dynticks) & 0x1);
rcu_lockdep_assert(!lock_is_held(&rcu_lock_map),
"Illegal idle entry in RCU read-side critical section.");
rcu_lockdep_assert(!lock_is_held(&rcu_bh_lock_map),
"Illegal idle entry in RCU-bh read-side critical section.");
rcu_lockdep_assert(!lock_is_held(&rcu_sched_lock_map),
"Illegal idle entry in RCU-sched read-side critical section.");
}
static void iblock_bio_done(struct bio *bio, int err)
{
struct se_cmd *cmd = bio->bi_private;
struct iblock_req *ibr = cmd->priv;
/*
* Set -EIO if !BIO_UPTODATE and the passed is still err=0
*/
if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err)
err = -EIO;
if (err != 0) {
pr_err("test_bit(BIO_UPTODATE) failed for bio: %p,"
" err: %d\n", bio, err);
/*
* Bump the ib_bio_err_cnt and release bio.
*/
atomic_inc(&ibr->ib_bio_err_cnt);
smp_mb__after_atomic_inc();
}
bio_put(bio);
iblock_complete_cmd(cmd);
}
/**
* kref_get - increment refcount for object.
* @kref: object.
*/
void kref_get(struct kref *kref)
{
if(!atomic_read(&kref->refcount))
printk(KERN_WARNING "%s failed for atomic_read\n",
__func__);
/* TD 80761
WARN_ON(!atomic_read(&kref->refcount));
*/
atomic_inc(&kref->refcount);
smp_mb__after_atomic_inc();
}
void rcu_nmi_exit(void)
{
struct rcu_dynticks *rdtp = &__get_cpu_var(rcu_dynticks);
if (rdtp->dynticks_nmi_nesting == 0 ||
--rdtp->dynticks_nmi_nesting != 0)
return;
smp_mb__before_atomic_inc();
atomic_inc(&rdtp->dynticks);
smp_mb__after_atomic_inc();
WARN_ON_ONCE(atomic_read(&rdtp->dynticks) & 0x1);
}
void rcu_nmi_enter(void)
{
struct rcu_dynticks *rdtp = &__get_cpu_var(rcu_dynticks);
if (rdtp->dynticks_nmi_nesting == 0 &&
(atomic_read(&rdtp->dynticks) & 0x1))
return;
rdtp->dynticks_nmi_nesting++;
smp_mb__before_atomic_inc();
atomic_inc(&rdtp->dynticks);
smp_mb__after_atomic_inc();
WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks) & 0x1));
}
/**
* drm_update_vblank_count - update the master vblank counter
* @dev: DRM device
* @crtc: counter to update
*
* Call back into the driver to update the appropriate vblank counter
* (specified by @crtc). Deal with wraparound, if it occurred, and
* update the last read value so we can deal with wraparound on the next
* call if necessary.
*
* Only necessary when going from off->on, to account for frames we
* didn't get an interrupt for.
*
* Note: caller must hold dev->vbl_lock since this reads & writes
* device vblank fields.
*/
static void drm_update_vblank_count(struct drm_device *dev, int crtc)
{
u32 cur_vblank, diff, tslot, rc;
struct timeval t_vblank;
/*
* Interrupts were disabled prior to this call, so deal with counter
* wrap if needed.
* NOTE! It's possible we lost a full dev->max_vblank_count events
* here if the register is small or we had vblank interrupts off for
* a long time.
*
* We repeat the hardware vblank counter & timestamp query until
* we get consistent results. This to prevent races between gpu
* updating its hardware counter while we are retrieving the
* corresponding vblank timestamp.
*/
do {
cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0);
} while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc));
/* Deal with counter wrap */
diff = cur_vblank - dev->last_vblank[crtc];
if (cur_vblank < dev->last_vblank[crtc]) {
diff += dev->max_vblank_count;
DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
crtc, dev->last_vblank[crtc], cur_vblank, diff);
}
DPRINTF("enabling vblank interrupts on crtc %d, missed %d\n",
crtc, diff);
/* Reinitialize corresponding vblank timestamp if high-precision query
* available. Skip this step if query unsupported or failed. Will
* reinitialize delayed at next vblank interrupt in that case.
*/
if (rc) {
tslot = atomic_read(&dev->_vblank_count[crtc]) + diff;
vblanktimestamp(dev, crtc, tslot) = t_vblank;
}
smp_mb__before_atomic_inc();
atomic_add(diff, &dev->_vblank_count[crtc]);
smp_mb__after_atomic_inc();
}
static int tcm_loop_port_link(
struct se_portal_group *se_tpg,
struct se_lun *lun)
{
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
struct tcm_loop_tpg, tl_se_tpg);
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
atomic_inc(&tl_tpg->tl_tpg_port_count);
smp_mb__after_atomic_inc();
/*
* Add Linux/SCSI struct scsi_device by HCTL
*/
scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
return 0;
}
static void rcu_idle_exit_common(struct rcu_dynticks *rdtp, long long oldval)
{
smp_mb__before_atomic_inc();
atomic_inc(&rdtp->dynticks);
smp_mb__after_atomic_inc();
WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks) & 0x1));
rcu_cleanup_after_idle(smp_processor_id());
trace_rcu_dyntick("End", oldval, rdtp->dynticks_nesting);
if (!is_idle_task(current)) {
struct task_struct *idle = idle_task(smp_processor_id());
trace_rcu_dyntick("Error on exit: not idle task",
oldval, rdtp->dynticks_nesting);
ftrace_dump(DUMP_ALL);
WARN_ONCE(1, "Current pid: %d comm: %s / Idle pid: %d comm: %s",
current->pid, current->comm,
idle->pid, idle->comm);
}
}
void crash_ipi_callback(struct pt_regs *regs)
{
static cpumask_t cpus_state_saved = CPU_MASK_NONE;
int cpu = smp_processor_id();
if (!cpu_online(cpu))
return;
hard_irq_disable();
if (!cpumask_test_cpu(cpu, &cpus_state_saved)) {
crash_save_cpu(regs, cpu);
cpumask_set_cpu(cpu, &cpus_state_saved);
}
atomic_inc(&cpus_in_crash);
smp_mb__after_atomic_inc();
/*
* Starting the kdump boot.
* This barrier is needed to make sure that all CPUs are stopped.
*/
while (!time_to_dump)
cpu_relax();
if (ppc_md.kexec_cpu_down)
ppc_md.kexec_cpu_down(1, 1);
#ifdef CONFIG_PPC64
kexec_smp_wait();
#else
for (;;); /* FIXME */
#endif
/* NOTREACHED */
}
/**
* cpupri_set - update the cpu priority setting
* @cp: The cpupri context
* @cpu: The target cpu
* @newpri: The priority (INVALID-RT99) to assign to this CPU
*
* Note: Assumes cpu_rq(cpu)->lock is locked
*
* Returns: (void)
*/
void cpupri_set(struct cpupri *cp, int cpu, int newpri)
{
int *currpri = &cp->cpu_to_pri[cpu];
int oldpri = *currpri;
int do_mb = 0;
newpri = convert_prio(newpri);
BUG_ON(newpri >= CPUPRI_NR_PRIORITIES);
if (newpri == oldpri)
return;
/*
* If the cpu was currently mapped to a different value, we
* need to map it to the new value then remove the old value.
* Note, we must add the new value first, otherwise we risk the
* cpu being missed by the priority loop in cpupri_find.
*/
if (likely(newpri != CPUPRI_INVALID)) {
struct cpupri_vec *vec = &cp->pri_to_cpu[newpri];
cpumask_set_cpu(cpu, vec->mask);
/*
* When adding a new vector, we update the mask first,
* do a write memory barrier, and then update the count, to
* make sure the vector is visible when count is set.
*/
smp_mb__before_atomic_inc();
atomic_inc(&(vec)->count);
do_mb = 1;
}
if (likely(oldpri != CPUPRI_INVALID)) {
struct cpupri_vec *vec = &cp->pri_to_cpu[oldpri];
/*
* Because the order of modification of the vec->count
* is important, we must make sure that the update
* of the new prio is seen before we decrement the
* old prio. This makes sure that the loop sees
* one or the other when we raise the priority of
* the run queue. We don't care about when we lower the
* priority, as that will trigger an rt pull anyway.
*
* We only need to do a memory barrier if we updated
* the new priority vec.
*/
if (do_mb)
smp_mb__after_atomic_inc();
/*
* When removing from the vector, we decrement the counter first
* do a memory barrier and then clear the mask.
*/
atomic_dec(&(vec)->count);
smp_mb__after_atomic_inc();
cpumask_clear_cpu(cpu, vec->mask);
}
*currpri = newpri;
}
static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
{
atomic_inc(&genpd->sd_count);
smp_mb__after_atomic_inc();
}
/**
* kref_get - increment refcount for object.
* @kref: object.
*/
void kref_get(struct kref *kref)
{
WARN_ON(!atomic_read(&kref->refcount));
atomic_inc(&kref->refcount);
smp_mb__after_atomic_inc();
}
static inline void ccids_read_lock(void)
{
atomic_inc(&ccids_lockct);
smp_mb__after_atomic_inc();
spin_unlock_wait(&ccids_lock);
}
static void helper_lock(void)
{
atomic_inc(&running_helpers);
smp_mb__after_atomic_inc();
}
/*
* Disable vblank irq's on crtc, make sure that last vblank count
* of hardware and corresponding consistent software vblank counter
* are preserved, even if there are any spurious vblank irq's after
* disable.
*/
static void vblank_disable_and_save(struct drm_device *dev, int crtc)
{
u32 vblcount;
s64 diff_ns;
int vblrc;
struct timeval tvblank;
int count = DRM_TIMESTAMP_MAXRETRIES;
/* Prevent vblank irq processing while disabling vblank irqs,
* so no updates of timestamps or count can happen after we've
* disabled. Needed to prevent races in case of delayed irq's.
*/
mtx_enter(&dev->vblank_time_lock);
dev->driver->disable_vblank(dev, crtc);
dev->vblank_enabled[crtc] = 0;
/* No further vblank irq's will be processed after
* this point. Get current hardware vblank count and
* vblank timestamp, repeat until they are consistent.
*
* FIXME: There is still a race condition here and in
* drm_update_vblank_count() which can cause off-by-one
* reinitialization of software vblank counter. If gpu
* vblank counter doesn't increment exactly at the leading
* edge of a vblank interval, then we can lose 1 count if
* we happen to execute between start of vblank and the
* delayed gpu counter increment.
*/
do {
dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc);
vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0);
} while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc);
if (!count)
vblrc = 0;
/* Compute time difference to stored timestamp of last vblank
* as updated by last invocation of drm_handle_vblank() in vblank irq.
*/
vblcount = atomic_read(&dev->_vblank_count[crtc]);
diff_ns = timeval_to_ns(&tvblank) -
timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
/* If there is at least 1 msec difference between the last stored
* timestamp and tvblank, then we are currently executing our
* disable inside a new vblank interval, the tvblank timestamp
* corresponds to this new vblank interval and the irq handler
* for this vblank didn't run yet and won't run due to our disable.
* Therefore we need to do the job of drm_handle_vblank() and
* increment the vblank counter by one to account for this vblank.
*
* Skip this step if there isn't any high precision timestamp
* available. In that case we can't account for this and just
* hope for the best.
*/
if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) {
atomic_inc(&dev->_vblank_count[crtc]);
smp_mb__after_atomic_inc();
}
/* Invalidate all timestamps while vblank irq's are off. */
clear_vblank_timestamps(dev, crtc);
mtx_leave(&dev->vblank_time_lock);
}
