diff options
| author | Michael Ellerman <mpe@ellerman.id.au> | 2020-04-26 21:44:10 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-15 11:58:55 +1000 |
| commit | 7481cad4747303442209bc5dba2f56c3afcea07d (patch) | |
| tree | e5b1152ce40d931a33a608a80a1083d94a23d4d3 /tools/testing/selftests/powerpc/pmu/loop.S | |
| parent | 24ac99e97fa7b8f0db9b48413a76def9cf73295c (diff) | |
selftests/powerpc: Add a test of counting larx/stcx
This is based on the count_instructions test.
However this one also counts the number of failed stcx's, and in
conjunction with knowing the size of the stcx loop, can calculate the
total number of instructions executed even in the face of
non-deterministic stcx failures.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200426114410.3917383-1-mpe@ellerman.id.au
Diffstat (limited to 'tools/testing/selftests/powerpc/pmu/loop.S')
| -rw-r--r-- | tools/testing/selftests/powerpc/pmu/loop.S | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/loop.S b/tools/testing/selftests/powerpc/pmu/loop.S index 8cc9b5e2c9de..c52ba09b6fed 100644 --- a/tools/testing/selftests/powerpc/pmu/loop.S +++ b/tools/testing/selftests/powerpc/pmu/loop.S @@ -41,3 +41,38 @@ FUNC_START(thirty_two_instruction_loop) subi r3,r3,1 b FUNC_NAME(thirty_two_instruction_loop) FUNC_END(thirty_two_instruction_loop) + +FUNC_START(thirty_two_instruction_loop_with_ll_sc) + cmpdi r3,0 + beqlr + addi r5,r5,1 + addi r5,r5,1 + addi r5,r5,1 # 5 + addi r5,r5,1 + addi r5,r5,1 + addi r5,r5,1 + addi r5,r5,1 +1: ldarx r6,0,r4 # 10 + addi r5,r5,1 + addi r5,r5,1 + addi r5,r5,1 + addi r5,r5,1 + addi r5,r5,1 # 15 + addi r5,r5,1 + addi r5,r5,1 + stdcx. r6,0,r4 + bne- 1b + addi r5,r5,1 # 20 + addi r5,r5,1 + addi r5,r5,1 + addi r5,r5,1 + addi r5,r5,1 + addi r5,r5,1 # 25 + addi r5,r5,1 + addi r5,r5,1 + addi r5,r5,1 + addi r5,r5,1 + addi r5,r5,1 # 30 + subi r3,r3,1 + b FUNC_NAME(thirty_two_instruction_loop_with_ll_sc) +FUNC_END(thirty_two_instruction_loop_with_ll_sc) |