kernel/linux.git/tools/testing/selftests/powerpc, branch v4.2-rc2

powerpc/tm: Abort syscalls in active transactions

2015-06-19T07:10:28+00:00

This patch changes the syscall handler to doom (tabort) active transactions when a syscall is made and return very early without performing the syscall and keeping side effects to a minimum (no CPU accounting or system call tracing is performed). Also included is a new HWCAP2 bit, PPC_FEATURE2_HTM_NOSC, to indicate this behaviour to userspace. Currently, the system call instruction automatically suspends an active transaction which causes side effects to persist when an active transaction fails. This does change the kernel's behaviour, but in a way that was documented as unsupported. It doesn't reduce functionality as syscalls will still be performed after tsuspend; it just requires that the transaction be explicitly suspended. It also provides a consistent interface and makes the behaviour of user code substantially the same across powerpc and platforms that do not support suspended transactions (e.g. x86 and s390). Performance measurements using http://ozlabs.org/~anton/junkcode/null_syscall.c indicate the cost of a normal (non-aborted) system call increases by about 0.25%. Signed-off-by: Sam Bobroff Signed-off-by: Michael Ellerman

selftests/powerpc: Add gitignore file for the new DSCR tests

2015-06-07T09:38:20+00:00

This patch adds .gitignore for all the newly added DSCR tests. Signed-off-by: Anshuman Khandual Signed-off-by: Michael Ellerman

selftests/powerpc: Add thread based stress test for DSCR sysfs interfaces

2015-06-07T09:38:18+00:00

This patch adds a test to update the system wide DSCR value repeatedly and then verifies that any thread on any given CPU on the system must be able to see the same DSCR value whether its is being read through the problem state based SPR or the privilege state based SPR. Signed-off-by: Anshuman Khandual Signed-off-by: Michael Ellerman

selftests/powerpc: Add test for all DSCR sysfs interfaces

2015-06-07T09:37:58+00:00

This test continuously updates the system wide DSCR default value in the sysfs interface and makes sure that the same is reflected across all the sysfs interfaces for each individual CPUs present on the system. Acked-by: Shuah Khan Signed-off-by: Anshuman Khandual Signed-off-by: Michael Ellerman

selftests/powerpc: Add test for DSCR inheritence across fork & exec

2015-06-07T09:37:31+00:00

This patch adds a test case to verify that the changed DSCR value inside any process would be inherited to it's child across the fork and exec system call. Acked-by: Shuah Khan Signed-off-by: Anshuman Khandual Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman

selftests/powerpc: Add test for DSCR value inheritence across fork

2015-06-07T09:37:11+00:00

This patch adds a test to verify that the changed DSCR value inside any process would be inherited to it's child process across the fork system call. Acked-by: Shuah Khan Signed-off-by: Anshuman Khandual Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman

selftests/powerpc: Add test for DSCR SPR numbers

2015-06-07T09:36:51+00:00

This patch adds a test which verifies that the DSCR privilege and problem state SPR read & write accesses while making sure that the results are always the same irrespective of which SPR number is being used. Acked-by: Shuah Khan Signed-off-by: Anshuman Khandual Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman

selftests/powerpc: Add test for explicitly changing DSCR value

2015-06-07T09:36:08+00:00

This patch adds a test which modifies the DSCR using mtspr instruction and verifies the change using mfspr instruction. It uses both the privilege state SPR as well as the problem state SPR for the purpose. Acked-by: Shuah Khan Signed-off-by: Anshuman Khandual Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman

selftests/powerpc: Add test for system wide DSCR default

2015-06-07T09:35:38+00:00

This patch adds a test case for the system wide DSCR default value, which when changed through it's sysfs interface must be visible to all threads reading DSCR either through the privilege state SPR or the problem state SPR. The DSCR value change should be immediate as well. Acked-by: Shuah Khan Signed-off-by: Anshuman Khandual Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman

selftests/powerpc: Add install support to more powerpc tests

2015-06-02T06:54:49+00:00

These tests were merged in parallel to the install support, update them now to use it. This also adds cross compile support for the VPHN test which was missing it. Signed-off-by: Michael Ellerman