Raven ridge (2400g) fails to start (swiotlb buffer is full) with IOMMU disabled

Submitted by ojab @ojab

Assigned to Default DRI bug account

Link to original bug (#106245)

Description

Created attachment 139123
full dmesg, kernel 4.16.4

Ryzen 2400g
ASUS A320M-K with IOMMU disabled (either in BIOS/EFI or using amd_iommu=off)
kernels 4.16.4 & 4.17-rc2 (haven't this hardware before yesterday, so haven't tested with older kernels)

amdgpu fails to load:

Apr 25 23:39:36 ojab kernel: [ 1.886215] amdgpu 0000:08:00.0: swiotlb buffer is full (sz: 262152 bytes)
Apr 25 23:39:36 ojab kernel: [ 1.886315] amdgpu 0000:08:00.0: swiotlb: coherent allocation failed, size=262152
Apr 25 23:39:36 ojab kernel: [ 1.886429] CPU: 7 PID: 263 Comm: udevd Not tainted 4.16.4-ojab #3 (closed)
Apr 25 23:39:36 ojab kernel: [ 1.886524] Call Trace:
Apr 25 23:39:36 ojab kernel: [ 1.887060] dump_stack+0x67/0x93
Apr 25 23:39:36 ojab kernel: [ 1.887130] swiotlb_alloc_coherent+0x1da/0x1f0
Apr 25 23:39:36 ojab kernel: [ 1.887237] amdgpu_ih_ring_init+0x1fc/0x2c0 [amdgpu]
Apr 25 23:39:36 ojab kernel: [ 1.887339] vega10_ih_sw_init+0x18/0xb0 [amdgpu]
Apr 25 23:39:36 ojab kernel: [ 1.887430] amdgpu_device_init+0xa35/0x11f0 [amdgpu]
Apr 25 23:39:36 ojab kernel: [ 1.887523] amdgpu_driver_load_kms+0x56/0x170 [amdgpu]
Apr 25 23:39:36 ojab kernel: [ 1.887605] drm_dev_register+0x166/0x1f0 [drm]
Apr 25 23:39:36 ojab kernel: [ 1.887695] amdgpu_pci_probe+0x113/0x1a0 [amdgpu]
Apr 25 23:39:36 ojab kernel: [ 1.887770] pci_device_probe+0xc9/0x140
Apr 25 23:39:36 ojab kernel: [ 1.887842] driver_probe_device+0x281/0x370
Apr 25 23:39:36 ojab kernel: [ 1.887916] __driver_attach+0xa9/0xb0
Apr 25 23:39:36 ojab kernel: [ 1.887986] ? driver_probe_device+0x370/0x370
Apr 25 23:39:36 ojab kernel: [ 1.888072] bus_for_each_dev+0x88/0xd0
Apr 25 23:39:36 ojab kernel: [ 1.888143] bus_add_driver+0x1b4/0x230
Apr 25 23:39:36 ojab kernel: [ 1.888215] ? 0xffffffffc1127000
Apr 25 23:39:36 ojab kernel: [ 1.888284] driver_register+0x57/0xc0
Apr 25 23:39:36 ojab kernel: [ 1.888355] ? 0xffffffffc1127000
Apr 25 23:39:36 ojab kernel: [ 1.888425] do_one_initcall+0x5c/0x1c0
Apr 25 23:39:36 ojab kernel: [ 1.888496] do_init_module+0x5e/0x20d
Apr 25 23:39:36 ojab kernel: [ 1.888576] load_module+0x137f/0x19b0
Apr 25 23:39:36 ojab kernel: [ 1.888656] ? m_show+0x1e0/0x1e0
Apr 25 23:39:36 ojab kernel: [ 1.888735] SYSC_init_module+0x102/0x150
Apr 25 23:39:36 ojab kernel: [ 1.888818] do_syscall_64+0x69/0x120
Apr 25 23:39:36 ojab kernel: [ 1.888899] entry_SYSCALL_64_after_hwframe+0x42/0xb7
Apr 25 23:39:36 ojab kernel: [ 1.888988] RIP: 0033:0x7f1eae06551a
Apr 25 23:39:36 ojab kernel: [ 1.889079] RSP: 002b:00007ffcce027138 EFLAGS: 00000246 ORIG_RAX: 00000000000000af
Apr 25 23:39:36 ojab kernel: [ 1.889194] RAX: ffffffffffffffda RBX: 00000000025ab5a0 RCX: 00007f1eae06551a
Apr 25 23:39:36 ojab kernel: [ 1.889290] RDX: 00007f1eaec96e9d RSI: 0000000000465290 RDI: 0000000002719670
Apr 25 23:39:36 ojab kernel: [ 1.889386] RBP: 00007f1eaec96e9d R08: 00000000ffffffff R09: 00000000025af020
Apr 25 23:39:36 ojab kernel: [ 1.889483] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002719670
Apr 25 23:39:36 ojab kernel: [ 1.889579] R13: 00000000025ab7f0 R14: 0000000000020000 R15: 0000000001c9c380
Apr 25 23:39:36 ojab kernel: [ 1.889694] [drm:amdgpu_device_init [amdgpu]] ERROR sw_init of IP block <vega10_ih> failed -12
Apr 25 23:39:36 ojab kernel: [ 1.889815] amdgpu 0000:08:00.0: amdgpu_device_ip_init failed

Attachment 139123, "full dmesg, kernel 4.16.4":
dmesg.txt