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authorAlex Waterman <alexw@nvidia.com>2016-11-28 15:48:37 -0500
committermobile promotions <svcmobile_promotions@nvidia.com>2016-12-19 18:40:08 -0500
commit9e46d3731e5ce555bdc46410220bc5a6d8db6067 (patch)
treea74d8948bba68c94dad505645236a13dda149eaf /drivers/gpu/nvgpu/vgpu/vgpu.h
parent274e1881af2e4c327fda5e28eb804fe304a2f36e (diff)
gpu: nvgpu: Check for dead GPU
Check if the GPU is present after each register read. If the a register read returns 0xffffffff then it's possible the GPU has fallen off the bus for some reason or another. However, to confirm that a register read is due to a dead GPU vs just a 0xffffffff being returned by happenstance the chip ID register is read which should never return 0xffffffff. If that read returns 0xffffffff as well then certainly the GPU is dead. Bug 1805082 Bug 1816516 Bug 1807277 Change-Id: I4de61b56289217d9c0d8167e84615a67c8bde8a9 Signed-off-by: Alex Waterman <alexw@nvidia.com> Reviewed-on: http://git-master/r/1239518 (cherry picked from commit bd50828de20aba9b2887ee99c2269602c21a793f) Reviewed-on: http://git-master/r/1261916 Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
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