Tejal Kudav d8a9b899f4 gpu: nvgpu: Add nvlink_probe unit ...

Move the code involved in nvlink probe sequence into a separate
unit called "nvlink_probe"
nvlink probe code is spread over both the common and OS specific
nvlink files.

Nvlink Probe unit would encompass code needed to initialize the
nvlink software state. Nvlink software initialization involves:
1. Allocate memory for nvlink_device and nvlink_link structs
2. Read the device tree pci node to know about nvlink topology
3. Initialize nvlink function pointers needed by Tegra nvlink
   core-driver
4. Register nvlink_device and nvlink_link with the core-driver.

nvlink probe returns -ENODEV when nvlink is not supported.
Nvlink is not supported in two cases:
1. There is no nvlink IP on the Tegra SoC which is denoted by
   CONFIG_TEGRA_NVLINK or
2. The pci device tree node does not have "nvidia,nvlink" child
   node needed to describe nvlink topology.

Any negative return value other than -ENODEV denotes failure in
execution of nvlink probe.

JIRA NVGPU-1783

Change-Id: I50011b25d88d8cc01569caac7895abe32ee38215
Signed-off-by: Tejal Kudav <tkudav@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1994619
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2019-01-28 00:05:46 -08:00

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