GIM

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What is GIM?

GIM (GPU-IOV Module) is a Linux kernel module for AMD SR-IOV based HW Virtualization (MxGPU) product. It can support KVM, open source Xen and any other Linux kernel based hypervisors with necessary kernel compatibility modification. GIM is reponsible for:

• GPU IOV initialization
• Virtual function configuration and enablement
• GPU scheduling for world switch
• Hang detection and virtual function level reset (FLR)

• PF/VF hand shake and other GPU utilities.

  Currently, only AMD S7150 series GPUs are supported.

DOCUMENTATION:

All documents are listed in SRC_ROOT/docs

SOFTWARE REQUIREMENTS:

• The tested host OS for GIM is Ubuntu16.04.2. All other hypervisor SW(KVM, XEN, QEMU, LIBVIRT) versions are aligned with default version of OS.

  GIM supports KVM in Ubuntu 16.04, and supports XEN in CentOS 7.3.

  Host OS	Kernel	KVM/Xen	QEMU	libvirt
  Ubuntu 16.04.2 server	4.4.0-75-generic	KVM 4.4	2.5.0	1.3.1

• The tested guest OS

  Guest OS	Distributions
  Linux	Ubuntu 16.04 LTS 64bit; CentOS 7.3 64 bit
  Windows	Win7 64bit; Win10 TH2 64bit

• Some legacy Linux kernels have issues with enabling PCI SR-IOV. It is suggested to use Ubuntu 4.4.0-75-generic kernel and apply the patch for IOV module. The patch file can be found under SRC_ROOT/patch.

HOW TO BUILD & INSTALL:

All driver source codes are under SRC_ROOT/drv.

1. Typing command "make" in terminal under SRC_ROOT/drv can generate gim.ko.
2. Typing command "make install" in terminal under SRC_ROOT/drv can install gim.ko to /lib/modules/$(KERNELRELEASE)/GIM/.
3. Generally, Just run helper SRC_ROOT/gim.sh in a command terminal also can completed build and installation. And gim.sh -help can display usages.

4. Blacklist amdgpu and amdkfd and reboot the server. Such as, under Ubuntu, by adding the following line to the end of file /etc/modprobe.d/blacklist.conf

   blacklist amdgpu
   blacklist amdkfd

   HOW TO LOAD:

5. Typing command "modprobe gim" in terminal can load gim driver
6. Usually, Typing command "lsmod | grep gim " and "lspci | grep AMD" in terminal can help to check if gim driver is loaded

HOW TO CONFIGURE BUILD:

Read this section carefully. New configuration options could be added in each release, and unexpected problems can occur if the configuration files are not set up as expected.

• Alternative configuration commands are

  CONFIG_GIM_HEARTBEAT_TIMER
          Heartbeat timer provides a useful way to display statistics
          of GIM periodically for debug purpose.
          Currently, it only counts the number of scheduler timer ticks
          and world switches, if the configuration is defined.

  • Edit configuraiton in Makefile

    GIM is an external kernel driver module. The driver configuration is different from upstream kernel driver. Editing "KBUILD_CFLAGS" in the Makefile is preferred to pass the configuration to GIM.

HISTORY:

• 1.0 (2017/07/20) The original release support AMD S7150 series.

• 2.0 (2018/9/30) Fix some issues for AMD S7150 series.

• 3.0 (2019/3/28) Adding support for mixed guest OS. Fix some issues for AMD S7150 series.