Re: [PATCH] drm/amdkfd: fix interrupt spin lock

["Deucher, Alexander" <Alexander.Deucher-5C7GfCeVMHo@public.gmane.org>]

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Acked-by: Alex Deucher <alexander.deucher-5C7GfCeVMHo@public.gmane.org>

________________________________
From: amd-gfx <amd-gfx-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org> on behalf of Christian König <ckoenig.leichtzumerken-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Sent: Friday, November 2, 2018 9:48:07 AM
To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [PATCH] drm/amdkfd: fix interrupt spin lock

Vega10 has multiple interrupt rings, so this can be called from multiple
calles at the same time resulting in:

[   71.779334] ================================
[   71.779406] WARNING: inconsistent lock state
[   71.779478] 4.19.0-rc1+ #44 Tainted: G        W
[   71.779565] --------------------------------
[   71.779637] inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
[   71.779740] kworker/6:1/120 [HC0[0]:SC0[0]:HE1:SE1] takes:
[   71.779832] 00000000ad761971 (&(&kfd->interrupt_lock)->rlock){?...},
at: kgd2kfd_interrupt+0x75/0x100 [amdgpu]
[   71.780058] {IN-HARDIRQ-W} state was registered at:
[   71.780115]   _raw_spin_lock+0x2c/0x40
[   71.780180]   kgd2kfd_interrupt+0x75/0x100 [amdgpu]
[   71.780248]   amdgpu_irq_callback+0x6c/0x150 [amdgpu]
[   71.780315]   amdgpu_ih_process+0x88/0x100 [amdgpu]
[   71.780380]   amdgpu_irq_handler+0x20/0x40 [amdgpu]
[   71.780409]   __handle_irq_event_percpu+0x49/0x2a0
[   71.780436]   handle_irq_event_percpu+0x30/0x70
[   71.780461]   handle_irq_event+0x37/0x60
[   71.780484]   handle_edge_irq+0x83/0x1b0
[   71.780506]   handle_irq+0x1f/0x30
[   71.780526]   do_IRQ+0x53/0x110
[   71.780544]   ret_from_intr+0x0/0x22
[   71.780566]   cpuidle_enter_state+0xaa/0x330
[   71.780591]   do_idle+0x203/0x280
[   71.780610]   cpu_startup_entry+0x6f/0x80
[   71.780634]   start_secondary+0x1b0/0x200
[   71.780657]   secondary_startup_64+0xa4/0xb0

Fix this by always using irq save spin locks.

Signed-off-by: Christian König <christian.koenig-5C7GfCeVMHo@public.gmane.org>
---
 drivers/gpu/drm/amd/amdkfd/kfd_device.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index d7e0f41f8edc..c004647c8cb4 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -682,6 +682,7 @@ void kgd2kfd_interrupt(struct kfd_dev *kfd, const void *ih_ring_entry)
 {
         uint32_t patched_ihre[KFD_MAX_RING_ENTRY_SIZE];
         bool is_patched = false;
+       unsigned long flags;

         if (!kfd->init_complete)
                 return;
@@ -691,7 +692,7 @@ void kgd2kfd_interrupt(struct kfd_dev *kfd, const void *ih_ring_entry)
                 return;
         }

-       spin_lock(&kfd->interrupt_lock);
+       spin_lock_irqsave(&kfd->interrupt_lock, flags);

         if (kfd->interrupts_active
             && interrupt_is_wanted(kfd, ih_ring_entry,
@@ -700,7 +701,7 @@ void kgd2kfd_interrupt(struct kfd_dev *kfd, const void *ih_ring_entry)
                                      is_patched ? patched_ihre : ih_ring_entry))
                 queue_work(kfd->ih_wq, &kfd->interrupt_work);

-       spin_unlock(&kfd->interrupt_lock);
+       spin_unlock_irqrestore(&kfd->interrupt_lock, flags);
 }

 int kgd2kfd_quiesce_mm(struct mm_struct *mm)
--
2.14.1

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