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powerpc/ps3: Convert half completion to rcuwait

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The PS3 notification interrupt and kthread use a hacked up completion to
communicate. Since we're wanting to change the completion implementation and
this is abuse anyway, replace it with a simple rcuwait since there is only ever
the one waiter.

AFAICT the kthread uses TASK_INTERRUPTIBLE to not increase loadavg, kthreads
cannot receive signals by default and this one doesn't look different. Use
TASK_IDLE instead.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200321113241.930037873@linutronix.de
This commit is contained in:
Peter Zijlstra (Intel) 2020-03-21 12:25:56 +01:00 committed by Peter Zijlstra
parent 80fbaf1c3f
commit e21fee5368
1 changed files with 9 additions and 9 deletions
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18
arch/powerpc/platforms/ps3/device-init.c
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@ -13,6 +13,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/reboot.h>
#include <linux/rcuwait.h>
#include <asm/firmware.h>
#include <asm/lv1call.h>
@ -670,7 +671,8 @@ struct ps3_notification_device {
spinlock_t lock;
u64 tag;
u64 lv1_status;
struct completion done;
struct rcuwait wait;
bool done;
};
enum ps3_notify_type {
@ -712,7 +714,8 @@ static irqreturn_t ps3_notification_interrupt(int irq, void *data)
pr_debug("%s:%u: completed, status 0x%llx\n", __func__,
__LINE__, status);
dev->lv1_status = status;
complete(&dev->done);
dev->done = true;
rcuwait_wake_up(&dev->wait);
}
spin_unlock(&dev->lock);
return IRQ_HANDLED;
@ -725,12 +728,12 @@ static int ps3_notification_read_write(struct ps3_notification_device *dev,
unsigned long flags;
int res;
init_completion(&dev->done);
spin_lock_irqsave(&dev->lock, flags);
res = write ? lv1_storage_write(dev->sbd.dev_id, 0, 0, 1, 0, lpar,
&dev->tag)
: lv1_storage_read(dev->sbd.dev_id, 0, 0, 1, 0, lpar,
&dev->tag);
dev->done = false;
spin_unlock_irqrestore(&dev->lock, flags);
if (res) {
pr_err("%s:%u: %s failed %d\n", __func__, __LINE__, op, res);
@ -738,14 +741,10 @@ static int ps3_notification_read_write(struct ps3_notification_device *dev,
}
pr_debug("%s:%u: notification %s issued\n", __func__, __LINE__, op);
res = wait_event_interruptible(dev->done.wait,
dev->done.done || kthread_should_stop());
rcuwait_wait_event(&dev->wait, dev->done || kthread_should_stop(), TASK_IDLE);
if (kthread_should_stop())
res = -EINTR;
if (res) {
pr_debug("%s:%u: interrupted %s\n", __func__, __LINE__, op);
return res;
}
if (dev->lv1_status) {
pr_err("%s:%u: %s not completed, status 0x%llx\n", __func__,
@ -810,6 +809,7 @@ static int ps3_probe_thread(void *data)
}
spin_lock_init(&dev.lock);
rcuwait_init(&dev.wait);
res = request_irq(irq, ps3_notification_interrupt, 0,
"ps3_notification", &dev);