Am 15.06.21 um 00:07 schrieb Felix Kuehling:
This should fix a kernel LOCKDEP warning on Vega10:
[ 149.416604] ================================
[ 149.420877] WARNING: inconsistent lock state
[ 149.425152] 5.11.0-kfd-fkuehlin #517 Not tainted
[ 149.429770] --------------------------------
[ 149.434053] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
[ 149.440059] swapper/3/0 [HC1[1]:SC0[0]:HE0:SE1] takes:
[ 149.445198] ffff9ac80e005d68 (&adev->vm_manager.pasid_lock){?.+.}-{2:2}, at: amdgpu_vm_get_task_info+0x25/0x90 [amdgpu]
[ 149.456252] {HARDIRQ-ON-W} state was registered at:
[ 149.461136] lock_acquire+0x242/0x390
[ 149.464895] _raw_spin_lock+0x2c/0x40
[ 149.468647] amdgpu_vm_handle_fault+0x44/0x380 [amdgpu]
[ 149.474187] gmc_v9_0_process_interrupt+0xa8/0x410 [amdgpu]
This is actually a false postive, but the patch is ok since it's the
easiest way to fix this :)
...
Signed-off-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 3b6c0b48d0b1..0b63686fc31a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -3394,11 +3394,12 @@ bool amdgpu_vm_handle_fault(struct amdgpu_device *adev, u32 pasid,
{
bool is_compute_context = false;
struct amdgpu_bo *root;
+ unsigned long irqflags;
uint64_t value, flags;
struct amdgpu_vm *vm;
int r;
- spin_lock(&adev->vm_manager.pasid_lock);
+ spin_lock_irqsave(&adev->vm_manager.pasid_lock, irqflags);
vm = idr_find(&adev->vm_manager.pasid_idr, pasid);
if (vm) {
root = amdgpu_bo_ref(vm->root.base.bo);
@@ -3406,7 +3407,7 @@ bool amdgpu_vm_handle_fault(struct amdgpu_device *adev, u32 pasid,
} else {
root = NULL;
}
- spin_unlock(&adev->vm_manager.pasid_lock);
+ spin_unlock_irqrestore(&adev->vm_manager.pasid_lock, irqflags);
if (!root)
return false;
@@ -3424,11 +3425,11 @@ bool amdgpu_vm_handle_fault(struct amdgpu_device *adev, u32 pasid,
goto error_unref;
/* Double check that the VM still exists */
- spin_lock(&adev->vm_manager.pasid_lock);
+ spin_lock_irqsave(&adev->vm_manager.pasid_lock, irqflags);
vm = idr_find(&adev->vm_manager.pasid_idr, pasid);
if (vm && vm->root.base.bo != root)
vm = NULL;
- spin_unlock(&adev->vm_manager.pasid_lock);
+ spin_unlock_irqrestore(&adev->vm_manager.pasid_lock, irqflags);
if (!vm)
goto error_unlock;
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