Philip Elcan 0561bace40 gpu: nvgpu: unit: atomic: add *_and_test atomicity tests ...

Add threaded tests for inc_and_test, dec_and_test, and sub_and_test
operations to verify atomicity. Also, add non-atomic tests for these to
verify we are actually verifying that the operations are atomic.

The new tests initialize an atomic to a non-zero value such that the
threads executing the atomic operation will reach and pass zero. The
test verifies only 1 thread observed zero (the atomic operation
returned true). The test is executed 5000 times with 100 threads.

For example, the inc_and_test will start the atomic at -50 and 100
threads will concurrently increment the atomic. The test will verify
only one of the 100 threads observed 0.

These tests are L1 tests since we don't expect regressions in the
atomics (they are basically reusing the GCC builtins) and have longer
run times in order to make sure the non-atomic variants fail.

JIRA NVGPU-2251

Change-Id: I7811779bc7c0965b4465d420066f3cff87bfa13e
Signed-off-by: Philip Elcan <pelcan@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2079378
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2019-04-18 13:35:10 -07:00

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