cma: cma_alloc: reserved: alloc failed, req-size: 4 pages, ret: -12

[torel]

[Bug Description]

Syslog riddled with

[ 6285.349570] cma: cma_alloc: reserved: alloc failed, req-size: 4 pages, ret: -12

on system Huawei TS200-2280 w/Kunpeng920-6426

[Steps to Reproduce]
1) Booted Ubuntu 22.04.4 w/ 5.15.0-94-generic
2) dmesg | grep cma_alloc

[Actual Results]
root@n012:~# dmesg |grep cma_alloc
[ 0.470356] cma: cma_alloc: reserved: alloc failed, req-size: 4096 pages, ret: -12
[ 0.687299] cma: cma_alloc: reserved: alloc failed, req-size: 256 pages, ret: -12
[ 0.687854] cma: cma_alloc: reserved: alloc failed, req-size: 256 pages, ret: -12
[ 0.688256] cma: cma_alloc: reserved: alloc failed, req-size: 256 pages, ret: -12
[ 0.688641] cma: cma_alloc: reserved: alloc failed, req-size: 256 pages, ret: -12
[ 0.689037] cma: cma_alloc: reserved: alloc failed, req-size: 256 pages, ret: -12
[ 0.689369] cma: cma_alloc: reserved: alloc failed, req-size: 256 pages, ret: -12
[ 0.689698] cma: cma_alloc: reserved: alloc failed, req-size: 256 pages, ret: -12
[ 0.690038] cma: cma_alloc: reserved: alloc failed, req-size: 256 pages, ret: -12
[ 0.715941] cma: cma_alloc: reserved: alloc failed, req-size: 4 pages, ret: -12
[ 5.603118] cma_alloc: 65 callbacks suppressed
[ 5.603120] cma: cma_alloc: reserved: alloc failed, req-size: 48 pages, ret: -12
[ 5.603141] cma: cma_alloc: reserved: alloc failed, req-size: 48 pages, ret: -12
[ 6.434164] cma: cma_alloc: reserved: alloc failed, req-size: 64 pages, ret: -12
[ 6.434188] cma: cma_alloc: reserved: alloc failed, req-size: 16 pages, ret: -12

[Expected Results]
no fail

[Reproducibility]
100%

[Additional information]
root@n012:~# inxi -b
System:
  Host: n012 Kernel: 5.15.0-94-generic aarch64 bits: 64 Console: pty pts/0
    Distro: Ubuntu 22.04.3 LTS (Jammy Jellyfish)
Machine:
  Type: Server System: Huawei product: TaiShan 200 (Model 2280) v: N/A
    serial: XXXXXXXXXXXXX
  Mobo: Huawei model: BC82AMDD v: V200R022C00 serial: XXXXXXXXXXXX
    UEFI: Huawei v: 6.65 date: 09/20/2023
CPU:
  Info: 2x 64-core Model N/A [MCP SMP] speed: 0
Graphics:
  Device-1: NVIDIA GA102GL [A40] driver: nvidia v: 545.23.08
  Device-2: Huawei Hi171x Series [iBMC Intelligent Management system chip
    w/VGA support]
    driver: hibmc-drm v: N/A
  Display: server: X.Org v: 1.20.14 driver: X: loaded: modesetting
    gpu: hibmc-drm resolution: 1: 3840x2160~60Hz 2: 3840x2160~60Hz
  OpenGL: renderer: llvmpipe (LLVM 15.0.7 128 bits)
    v: 4.5 Mesa 23.0.4-0ubuntu1~22.04.1
Network:
  Device-1: Huawei HNS GE/10GE/25GE RDMA Network driver: hns3
  Device-2: Huawei HNS GE/10GE/25GE Network driver: hns3
  Device-3: Huawei HNS GE/10GE/25GE RDMA Network driver: hns3
  Device-4: Huawei HNS GE/10GE/25GE Network driver: hns3
  Device-5: Mellanox MT28908 Family [ConnectX-6] driver: mlx5_core
  Device-6: Mellanox MT28908 Family [ConnectX-6] driver: mlx5_core
  Device-7: Huawei HNS GE/10GE/25GE RDMA Network driver: hns3
  Device-8: Huawei HNS GE/10GE/25GE Network driver: hns3
  Device-9: Huawei HNS GE/10GE/25GE RDMA Network driver: hns3
  Device-10: Huawei HNS GE/10GE/25GE Network driver: hns3
Drives:
  Local Storage: total: 2.83 TiB used: 419.33 TiB (14796.5%)
Info:
  Processes: 1506 Uptime: 1h 55m Memory: 1005.61 GiB used: 826.43 GiB (82.2%)
  Shell: Bash inxi: 3.3.13

[Resolution]
Probably related to Bug #1933302 for focal.

[torel (torehl)]

Duplicate of bug #1933301 ?

[Ike Panhc (ikepanhc)]

No, this issue is not duplicate of #1933301.

As I understand, cma_alloc tries to allocate continuous memory for specific usage, e.g. DMA, framebuffer.
When it fails, it falls back to use traditional memory allocation and drivers/applications get what it needs.

Unless we find out function has broken due to cma_alloc failing, I won't consider this is a bug.

I will set this bug to "Imcomplete" and let us know if any function is broken with cma_alloc failing.

Many thanks.

[torel (torehl)]

Added cma=128M to kernel parameters.