arcologos-infra/debugging/002-Ubuntu-20_04/02-Kernel-Boot-Params.md

Kernel Boot Params

Updating Grub

To select the AMDGPU driver / module.

https://askubuntu.com/a/1314983

I'll add the following flags to the appropriate line in /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="radeon.si_support=0 radeon.cik_support=0 amdgpu.si_support=1 amdgpu.cik_support=1 amdgpu.dc=1 amdgpu.dpm=1 amdgpu.modeset=1"

Then run

sudo update-grub

and reboot, selecting Ubuntu 20.04 per this branch of the debugging tree.

Rebooting

After rebooting, OpenCL detects the GPU! But it hangs and does not return from the call

sudo clinfo -l

The call without the sudo yields just the CPU and Number of devices: 0 as before.

Here's the glorious output:

$ sudo clinfo -l
[sudo] password for arcologos: 
Number of platforms:				 1
  Platform Profile:				 FULL_PROFILE
  Platform Version:				 OpenCL 2.1 AMD-APP (3558.0)
  Platform Name:				 AMD Accelerated Parallel Processing
  Platform Vendor:				 Advanced Micro Devices, Inc.
  Platform Extensions:				 cl_khr_icd cl_amd_event_callback 


  Platform Name:				 AMD Accelerated Parallel Processing
Number of devices:				 1
  Device Type:					 CL_DEVICE_TYPE_GPU
  Vendor ID:					 1002h
  Board name:					 AMD Radeon (TM) R9 390 Series
  Device Topology:				 PCI[ B#3, D#0, F#0 ]
  Max compute units:				 40
  Max work items dimensions:			 3
    Max work items[0]:				 1024
    Max work items[1]:				 1024
    Max work items[2]:				 1024
  Max work group size:				 256
  Preferred vector width char:			 4
  Preferred vector width short:			 2
  Preferred vector width int:			 1
  Preferred vector width long:			 1
  Preferred vector width float:			 1
  Preferred vector width double:		 1
  Native vector width char:			 4
  Native vector width short:			 2
  Native vector width int:			 1
  Native vector width long:			 1
  Native vector width float:			 1
  Native vector width double:			 1
  Max clock frequency:				 1005Mhz
  Address bits:					 64
  Max memory allocation:			 7301444400
  Image support:				 Yes
  Max number of images read arguments:		 128
  Max number of images write arguments:		 8
  Max image 2D width:				 16384
  Max image 2D height:				 16384
  Max image 3D width:				 16384
  Max image 3D height:				 16384
  Max image 3D depth:				 8192
  Max samplers within kernel:			 26545
  Max size of kernel argument:			 1024
  Alignment (bits) of base address:		 1024
  Minimum alignment (bytes) for any datatype:	 128
  Single precision floating point capability
    Denorms:					 No
    Quiet NaNs:					 Yes
    Round to nearest even:			 Yes
    Round to zero:				 Yes
    Round to +ve and infinity:			 Yes
    IEEE754-2008 fused multiply-add:		 Yes
  Cache type:					 Read/Write
  Cache line size:				 64
  Cache size:					 16384
  Global memory size:				 8589934592
  Constant buffer size:				 7301444400
  Max number of constant args:			 8
  Local memory type:				 Scratchpad
  Local memory size:				 65536
  Max pipe arguments:				 16
  Max pipe active reservations:			 16
  Max pipe packet size:				 3006477104
  Max global variable size:			 7301444400
  Max global variable preferred total size:	 8589934592
  Max read/write image args:			 64
  Max on device events:				 1024
  Queue on device max size:			 8388608
  Max on device queues:				 1
  Queue on device preferred size:		 262144
  SVM capabilities:				 
    Coarse grain buffer:			 Yes
    Fine grain buffer:				 Yes
    Fine grain system:				 No
    Atomics:					 No
  Preferred platform atomic alignment:		 0
  Preferred global atomic alignment:		 0
  Preferred local atomic alignment:		 0

Add User to Video Group

Per this response

https://github.com/RadeonOpenCompute/ROCm/issues/482#issuecomment-410551357

I add the current user to the video group. I forget where I first read that this was necessary, but next also is to try the render group.

sudo usermod -G video -a $USER