linux-toradex.git/tools/testing/selftests/powerpc, branch v3.16-rc7

selftests/powerpc: Use the test harness for the TM DSCR test

2014-06-24T04:29:41+00:00

This gives us standardised success/failure output and also handles
killing the test if it runs forever (2 minutes).

Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt

selftests/powerpc: Add tests of PMU EBBs

2014-06-11T07:03:58+00:00

The Power8 Performance Monitor Unit (PMU) has a new feature called Event
Based Branches (EBB). This commit adds tests of the kernel API for using
EBBs.

Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt

selftests/powerpc: Add support for skipping tests

2014-06-11T07:03:54+00:00

Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt

selftests/powerpc: Put the test in a separate process group

2014-06-11T07:03:49+00:00

Allows us to kill the test and any children it has spawned.

Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt

selftests/powerpc: Fix instruction loop for ABIv2 (LE)

2014-06-11T07:03:45+00:00

Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Correct DSCR during TM context switch

2014-06-11T07:02:56+00:00

Correct the DSCR SPR becoming temporarily corrupted if a task is
context switched during a transaction.

The problem occurs while suspending the task and is caused by saving
the DSCR to thread.dscr after it has already been set to the CPU's
default value:

__switch_to() calls __switch_to_tm()
	which calls tm_reclaim_task()
	which calls tm_reclaim_thread()
	which calls tm_reclaim()
		where the DSCR is set to the CPU's default
__switch_to() calls _switch()
		where thread.dscr is set to the DSCR

When the task is resumed, it's transaction will be doomed (as usual)
and the DSCR SPR will be corrupted, although the checkpointed value
will be correct. Therefore the DSCR will be immediately corrected by
the transaction aborting, unless it has been suspended. In that case
the incorrect value can be seen by the task until it resumes the
transaction.

The fix is to treat the DSCR similarly to the TAR and save it early
in __switch_to().

A program exposing the problem is added to the kernel self tests as:
tools/testing/selftests/powerpc/tm/tm-resched-dscr.

Signed-off-by: Sam Bobroff 
CC:  [v3.10+]
Signed-off-by: Benjamin Herrenschmidt

selftests/powerpc: Test the THP bug we fixed in the previous commit

2014-06-06T03:55:04+00:00

Signed-off-by: Michael Ellerman 
Reviewed-by: Aneesh Kumar K.V 
Signed-off-by: Benjamin Herrenschmidt

selftests/powerpc: Update for ABIv2

2014-04-23T01:41:07+00:00

Add some new definitions required to build the copyloop tests.

Signed-off-by: Anton Blanchard

selftests/powerpc: Import Anton's memcpy / copy_tofrom_user tests

2014-03-07T04:53:12+00:00

Turn Anton's memcpy / copy_tofrom_user test into something that can
live in tools/testing/selftests.

It requires one turd in arch/powerpc/lib/memcpy_64.S, but it's pretty
harmless IMHO.

We are sailing very close to the wind with the feature macros. We define
them to nothing, which currently means we get a few extra nops and
include the unaligned calls.

Signed-off-by: Anton Blanchard 
Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt

selftests: Add test of PMU instruction counting on powerpc

2013-08-14T04:57:10+00:00

This commit adds a test of instruction counting using the PMU on powerpc.

Although the bulk of the code is architecture agnostic, the code needs to
run a precisely sized loop which is implemented in assembler.

Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt