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List: qemu-devel
Subject: [Qemu-devel] [Bug 1809684] [NEW] amdgpu passthrough on POWER9 (ppc64el) not working
From: Timothy Pearson <kb9vqf () pearsoncomputing ! net>
Date: 2018-12-24 23:26:15
Message-ID: 154569397586.26258.18132613460124027534.malonedeb () chaenomeles ! canonical ! com
[Download RAW message or body]
Public bug reported:
When attempting to pass a Vega 56 GPU to a virtualized guest using QEMU
3.1 on ppc64el (POWER9), the guest is unable to initialize the GPU.
Further digging reveals the driver attempting to allocate a large BAR,
which then fails:
[ 6.058544] [drm] PCI I/O BAR is not found.
<snip uninteresting bits>
[ 6.679193] amdgpu 0000:00:03.0: BAR 2: releasing [mem 0x210400000000-0x2104001fffff pref]
[ 6.679306] amdgpu 0000:00:03.0: BAR 0: releasing [mem 0x210200000000-0x2103ffffffff pref]
[ 6.679361] amdgpu 0000:00:03.0: BAR 0: no space for [mem size 0x200000000 pref]
[ 6.679403] amdgpu 0000:00:03.0: BAR 0: failed to assign [mem size 0x200000000 pref]
[ 6.679444] amdgpu 0000:00:03.0: BAR 2: assigned [mem 0x200080200000-0x2000803fffff pref]
[ 6.681420] amdgpu 0000:00:03.0: VRAM: 8176M 0x000000F400000000 - 0x000000F5FEFFFFFF (8176M used)
[ 6.681507] amdgpu 0000:00:03.0: GART: 512M 0x0000000000000000 - 0x000000001FFFFFFF
[ 6.681594] amdgpu 0000:00:03.0: AGP: 267419648M 0x000000F800000000 - 0x0000FFFFFFFFFFFF
[ 6.681653] [drm] Detected VRAM RAM=8176M, BAR=0M
[ 6.681688] [drm] RAM width 2048bits HBM
[ 6.681885] [TTM] Zone kernel: Available graphics memory: 4176288 kiB
[ 6.681978] [TTM] Zone dma32: Available graphics memory: 2097152 kiB
[ 6.682043] [TTM] Initializing pool allocator
[ 6.682159] [drm] amdgpu: 8176M of VRAM memory ready
[ 6.682249] [drm] amdgpu: 6117M of GTT memory ready.
[ 6.682387] [drm] GART: num cpu pages 8192, num gpu pages 131072
[ 6.682466] amdgpu 0000:00:03.0: (-22) kernel bo map failed
[ 6.682539] [drm:amdgpu_device_init [amdgpu]] *ERROR* amdgpu_vram_scratch_init failed -22
[ 6.682592] amdgpu 0000:00:03.0: amdgpu_device_ip_init failed
[ 6.682636] amdgpu 0000:00:03.0: Fatal error during GPU init
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1809684
Title:
amdgpu passthrough on POWER9 (ppc64el) not working
Status in QEMU:
New
Bug description:
When attempting to pass a Vega 56 GPU to a virtualized guest using
QEMU 3.1 on ppc64el (POWER9), the guest is unable to initialize the
GPU. Further digging reveals the driver attempting to allocate a
large BAR, which then fails:
[ 6.058544] [drm] PCI I/O BAR is not found.
<snip uninteresting bits>
[ 6.679193] amdgpu 0000:00:03.0: BAR 2: releasing [mem 0x210400000000-0x2104001fffff pref]
[ 6.679306] amdgpu 0000:00:03.0: BAR 0: releasing [mem 0x210200000000-0x2103ffffffff pref]
[ 6.679361] amdgpu 0000:00:03.0: BAR 0: no space for [mem size 0x200000000 pref]
[ 6.679403] amdgpu 0000:00:03.0: BAR 0: failed to assign [mem size 0x200000000 pref]
[ 6.679444] amdgpu 0000:00:03.0: BAR 2: assigned [mem 0x200080200000-0x2000803fffff pref]
[ 6.681420] amdgpu 0000:00:03.0: VRAM: 8176M 0x000000F400000000 - 0x000000F5FEFFFFFF (8176M used)
[ 6.681507] amdgpu 0000:00:03.0: GART: 512M 0x0000000000000000 - 0x000000001FFFFFFF
[ 6.681594] amdgpu 0000:00:03.0: AGP: 267419648M 0x000000F800000000 - 0x0000FFFFFFFFFFFF
[ 6.681653] [drm] Detected VRAM RAM=8176M, BAR=0M
[ 6.681688] [drm] RAM width 2048bits HBM
[ 6.681885] [TTM] Zone kernel: Available graphics memory: 4176288 kiB
[ 6.681978] [TTM] Zone dma32: Available graphics memory: 2097152 kiB
[ 6.682043] [TTM] Initializing pool allocator
[ 6.682159] [drm] amdgpu: 8176M of VRAM memory ready
[ 6.682249] [drm] amdgpu: 6117M of GTT memory ready.
[ 6.682387] [drm] GART: num cpu pages 8192, num gpu pages 131072
[ 6.682466] amdgpu 0000:00:03.0: (-22) kernel bo map failed
[ 6.682539] [drm:amdgpu_device_init [amdgpu]] *ERROR* amdgpu_vram_scratch_init failed -22
[ 6.682592] amdgpu 0000:00:03.0: amdgpu_device_ip_init failed
[ 6.682636] amdgpu 0000:00:03.0: Fatal error during GPU init
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