[433605.477394] [drm] probing gen 2 caps for device 8086:9c18 = 5323c42/0
[433605.477415] [drm] PCIE gen 2 link speeds already enabled
[433605.479822] amdgpu 0000:03:00.0: PCIE GART of 1024M enabled (table at 0x000000F400040000).
[433605.733075] [drm:amdgpu_vm_init [amdgpu]] VM update mode is SDMA
[433611.485600] amdgpu 0000:03:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[433611.485602] amdgpu 0000:03:00.0: swiotlb: coherent allocation failed, size=2097152
[433611.485604] CPU: 2 PID: 25862 Comm: kworker/2:0 Tainted: G       A         4.15.0-rc8-next #12
[433611.485605] Hardware name: Dell Inc. Inspiron 3537/0PHTY0, BIOS A07 11/12/2013
[433611.485609] Workqueue: pm pm_runtime_work
[433611.485610] Call Trace:
[433611.485615]  dump_stack+0x46/0x64
[433611.485619]  swiotlb_alloc_coherent+0x1a1/0x1b0
[433611.485626]  ttm_dma_pool_get_pages+0x202/0x5d0 [ttm]
[433611.485631]  ttm_dma_populate+0x233/0x340 [ttm]
[433611.485635]  ttm_bo_move_memcpy+0x181/0x5c0 [ttm]
[433611.485668]  amdgpu_bo_move+0xa6/0x1c0 [amdgpu]
[433611.485673]  ttm_bo_handle_move_mem+0x101/0x540 [ttm]
[433611.485677]  ? ttm_bo_evict+0x139/0x190 [ttm]
[433611.485680]  ? pat_enabled+0x10/0x10
[433611.485684]  ? ttm_mem_evict_first+0x187/0x200 [ttm]
[433611.485687]  ? ttm_bo_force_list_clean+0x8e/0x160 [ttm]
[433611.485708]  ? amdgpu_device_suspend+0x210/0x370 [amdgpu]
[433611.485710]  ? load_balance+0x161/0x9b0
[433611.485712]  ? vga_switcheroo_runtime_resume+0x50/0x50
[433611.485728]  ? amdgpu_pmops_runtime_suspend+0x52/0xc0 [amdgpu]
[433611.485731]  ? pci_pm_runtime_suspend+0x5c/0x160
[433611.485732]  ? vga_switcheroo_runtime_suspend+0x1e/0x90
[433611.485734]  ? __rpm_callback+0xb6/0x1f0
[433611.485735]  ? vga_switcheroo_runtime_resume+0x50/0x50
[433611.485736]  ? rpm_callback+0x1f/0x70
[433611.485737]  ? vga_switcheroo_runtime_resume+0x50/0x50
[433611.485738]  ? rpm_suspend+0x12d/0x630
[433611.485740]  ? finish_task_switch+0xe9/0x230
[433611.485742]  ? pm_runtime_work+0x7d/0xa0
[433611.485744]  ? process_one_work+0x1e1/0x3c0
[433611.485745]  ? worker_thread+0x2b/0x3c0
[433611.485746]  ? wq_sysfs_prep_attrs+0x70/0x70
[433611.485748]  ? kthread+0x110/0x130
[433611.485750]  ? kthread_create_worker_on_cpu+0x70/0x70
[433611.485752]  ? ret_from_fork+0x35/0x40