drm/amdgpu: Use spinlock_irqsave for pasid_lock

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]
...

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Oak Zeng <Oak.Zeng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 7534f11..79cfa2d 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -3385,11 +3385,12 @@ 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.bo);
@@ -3397,7 +3398,7 @@ 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;
@@ -3415,11 +3416,11 @@ 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.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;