drm/amdgpu/iceland_ih: Enable soft IRQ handler ring

We are going to use the soft IRQ handler ring on GMC v8
to process interrupts from VM faults.

Signed-off-by: Timur Kristóf <[e-mail]>
Reviewed-by: Christian König <[e-mail]>
Signed-off-by: Christian König <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/iceland_ih.c

···
 	/* enable interrupts */
 	iceland_ih_enable_interrupts(adev);
 
+	if (adev->irq.ih_soft.ring_size)
+		adev->irq.ih_soft.enabled = true;
+
 	return 0;
 }
 
···
 	u32 wptr, tmp;
 
 	wptr = le32_to_cpu(*ih->wptr_cpu);
+
+	if (ih == &adev->irq.ih_soft)
+		goto out;
 
 	if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
 		goto out;
···
 	struct amdgpu_device *adev = ip_block->adev;
 
 	r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 64 * 1024, false);
+	if (r)
+		return r;
+
+	r = amdgpu_ih_ring_init(adev, &adev->irq.ih_soft, IH_SW_RING_SIZE, true);
 	if (r)
 		return r;