Re: [PATCH 29/44] drm/amdgpu: reserve fence slot to update page table

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Am 22.03.21 um 11:58 schrieb Felix Kuehling:
From: Philip Yang <Philip.Yang@xxxxxxx>

Forgot to reserve a fence slot to use sdma to update page table, cause
below kernel BUG backtrace to handle vm retry fault while application is
exiting.

[  133.048143] kernel BUG at /home/yangp/git/compute_staging/kernel/drivers/dma-buf/dma-resv.c:281!
[  133.048487] Workqueue: events amdgpu_irq_handle_ih1 [amdgpu]
[  133.048506] RIP: 0010:dma_resv_add_shared_fence+0x204/0x280
[  133.048672]  amdgpu_vm_sdma_commit+0x134/0x220 [amdgpu]
[  133.048788]  amdgpu_vm_bo_update_range+0x220/0x250 [amdgpu]
[  133.048905]  amdgpu_vm_handle_fault+0x202/0x370 [amdgpu]
[  133.049031]  gmc_v9_0_process_interrupt+0x1ab/0x310 [amdgpu]
[  133.049165]  ? kgd2kfd_interrupt+0x9a/0x180 [amdgpu]
[  133.049289]  ? amdgpu_irq_dispatch+0xb6/0x240 [amdgpu]
[  133.049408]  amdgpu_irq_dispatch+0xb6/0x240 [amdgpu]
[  133.049534]  amdgpu_ih_process+0x9b/0x1c0 [amdgpu]
[  133.049657]  amdgpu_irq_handle_ih1+0x21/0x60 [amdgpu]
[  133.049669]  process_one_work+0x29f/0x640
[  133.049678]  worker_thread+0x39/0x3f0
[  133.049685]  ? process_one_work+0x640/0x640

Signed-off-by: Philip Yang <Philip.Yang@xxxxxxx>
Signed-off-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>

Reviewed-by: Christian König <christian.koenig@xxxxxxx>

I'm going to push this to amd-staging-drm-next since it is really an independent bug fix.

Christian.

---
  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 10 ++++++++--
  1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index a61df234f012..3e32f76cd7bb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -3302,7 +3302,7 @@ bool amdgpu_vm_handle_fault(struct amdgpu_device *adev, u32 pasid,
  	struct amdgpu_bo *root;
  	uint64_t value, flags;
  	struct amdgpu_vm *vm;
-	long r;
+	int r;
  	bool is_compute_context = false;
spin_lock(&adev->vm_manager.pasid_lock);
@@ -3360,6 +3360,12 @@ bool amdgpu_vm_handle_fault(struct amdgpu_device *adev, u32 pasid,
  		value = 0;
  	}
+ r = dma_resv_reserve_shared(root->tbo.base.resv, 1);
+	if (r) {
+		pr_debug("failed %d to reserve fence slot\n", r);
+		goto error_unlock;
+	}
+
  	r = amdgpu_vm_bo_update_mapping(adev, adev, vm, true, false, NULL, addr,
  					addr, flags, value, NULL, NULL,
  					NULL);
@@ -3371,7 +3377,7 @@ bool amdgpu_vm_handle_fault(struct amdgpu_device *adev, u32 pasid,
  error_unlock:
  	amdgpu_bo_unreserve(root);
  	if (r < 0)
-		DRM_ERROR("Can't handle page fault (%ld)\n", r);
+		DRM_ERROR("Can't handle page fault (%d)\n", r);
error_unref:
  	amdgpu_bo_unref(&root);

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