On 4/15/21 7:12 PM, Tvrtko Ursulin wrote:
[Please note: This e-mail is from an EXTERNAL e-mail address]
Hi,
On 14/04/2021 15:48, Jun Miao wrote:
Don`t simple disable all the HD-irq, should race the region in the
intel_breadcrumbs_disarm_irq() only.
What is HD-irq, I am, not familiar with that term?
Disable local interrupt delivery from Hardware of cpu.:-)
Thanks,
Jun
BUG: sleeping function called from invalid context at
kernel/locking/rtmutex.c:969
#0: ffff89c4c00ca970 ((wq_completion)events){+.+.}-{0:0}, at:
process_one_work+0x1cf/0x6d0
#1: ffffa433c1f53e60
((work_completion)(&engine->retire_work)){+.+.}-{0:0}, at:
process_one_work+0x1cf 0x6d
#2: ffff89c4ccb0a0a8 (kernel_context){+.+.}-{0:0}, at:
engine_retire+0x62/0x110 [i915]
#3: ffff89c4cf682300 (wakeref.mutex#3){+.+.}-{0:0}, at:
__intel_wakeref_put_last+0x20/0x60 [i915]
#4: ffff89c4ccb08398 (&b->irq_lock){+.+.}-{0:0}, at:
intel_breadcrumbs_disarm_irq+0x20/0xd0 [i915]
irq event stamp: 2126
hardirqs last enabled at (2125): [<ffffffffbb134739>]
cancel_delayed_work+0xa9/0xc0
hardirqs last disabled at (2126): [<ffffffffc0507fe6>]
__intel_breadcrumbs_park+0x76/0x80 [i915]
softirqs last enabled at (0): [<ffffffffbb1099ce>]
copy_process+0x63e/0x1630
softirqs last disabled at (0): [<0000000000000000>] 0x0
CPU: 3 PID: 281 Comm: kworker/3:3 Not tainted
5.10.27-rt34-yocto-preempt-rt #1
Hardware name: Intel(R) Client Systems NUC7i5DNKE/NUC7i5DNB, BIOS
DNKBLi5v.86A.0064.2019.0523.1933 05/23 2019
Workqueue: events engine_retire [i915]
Call Trace:
show_stack+0x52/0x58
dump_stack+0x7d/0x9f
___might_sleep.cold+0xe3/0xf4
rt_spin_lock+0x3f/0xc0
? intel_breadcrumbs_disarm_irq+0x20/0xd0 [i915]
intel_breadcrumbs_disarm_irq+0x20/0xd0 [i915]
signal_irq_work+0x241/0x660 [i915]
? __this_cpu_preempt_check+0x13/0x20
? lockdep_hardirqs_off+0x106/0x120
__intel_breadcrumbs_park+0x3f/0x80 [i915]
__engine_park+0xbd/0xe0 [i915]
____intel_wakeref_put_last+0x22/0x60 [i915]
__intel_wakeref_put_last+0x50/0x60 [i915]
intel_context_exit_engine+0x5f/0x70 [i915]
i915_request_retire+0x139/0x2d0 [i915]
engine_retire+0xb0/0x110 [i915]
process_one_work+0x26d/0x6d0
worker_thread+0x53/0x330
kthread+0x1b0/0x1d0
? process_one_work+0x6d0/0x6d0
? __kthread_parkme+0xc0/0xc0
ret_from_fork+0x22/0x30
Fixes: 9d5612ca165a ("drm/i915/gt: Defer enabling the breadcrumb
interrupt to after submission")
Signed-off-by: Jun Miao <jun.miao@xxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_breadcrumbs.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
index 34a645d..0589b1a 100644
--- a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
@@ -103,10 +103,12 @@ static void
__intel_breadcrumbs_disarm_irq(struct intel_breadcrumbs *b)
static void intel_breadcrumbs_disarm_irq(struct intel_breadcrumbs *b)
{
- spin_lock(&b->irq_lock);
+ unsigned long flags;
+
+ spin_lock_irqsave(&b->irq_lock, flags);
if (b->irq_armed)
__intel_breadcrumbs_disarm_irq(b);
- spin_unlock(&b->irq_lock);
+ spin_unlock_irqrestore(&b->irq_lock, flags);
}
static void add_signaling_context(struct intel_breadcrumbs *b,
@@ -337,9 +339,7 @@ void __intel_breadcrumbs_park(struct
intel_breadcrumbs *b)
/* Kick the work once more to drain the signalers, and disarm
the irq */
irq_work_sync(&b->irq_work);
while (READ_ONCE(b->irq_armed) && !atomic_read(&b->active)) {
- local_irq_disable();
signal_irq_work(&b->irq_work);
- local_irq_enable();
Unfortunately there is another lock inside signal_irq_work (rq->lock)
which needs to be taken irq safe.
Ok, i will change the left spin_lock -> spin_lock_irqsave.
In fact, inside signal_irq_work, intel_breadcrumbs_arm_irq
(&b->irq_lock) which also needs to be taken irq safe.
Thanks,
Jun
RT patches are in tree or out of the tree these days?
I base on the mainline kernel tree， and this BUG warning will not
happen. But RT v5.10 will complain "BUG warning", so i want this patch
will solve RT WARNING without affecting mainline performance in mainline
tree.
Thanks,
Jun
Regards,
Tvrtko
cond_resched();
}
}
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