Debarshi Dutta 0ef96e4b1a gpu: nvgpu: correct handling of pbdma rc ...

nvgpu_rc_pbdma_fault just checks for the id and id_type from struct
nvgpu_pbdma_status_info. These contain invalid values during chsw_load
and chsw_switch. This patch corrects the above bug by checking for the
chsw status and then loading the values for id and type.

The current code reads the pbdma_status info after clearing the
interrupt. Other interrupts can cause enough delay between clearing the
interrupt and pbdma switching the channel leading to invalid channel/tsg
ID. Correct that by reading the pbdma_status info register before
clearing of the pbdma interrupt to correctly read the context
information before the pbdma can switch out the context.

Bug 2648298

Change-Id: Ic2f0682526e00d14ad58f0411472f34388183f2b
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2165047
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@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>

2019-08-05 02:56:16 -07:00

7.2 KiB

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