kernel/linux.git/tools/testing/selftests/powerpc, branch v4.6.4

selftests/powerpc: Test FPU and VMX regs in signal ucontext

2016-03-02T12:34:47+00:00

Load up the non volatile FPU and VMX regs and ensure that they are the expected value in a signal handler Signed-off-by: Cyril Bur Signed-off-by: Michael Ellerman

selftests/powerpc: Test preservation of FPU and VMX regs across preemption

2016-03-02T12:34:47+00:00

Loop in assembly checking the registers with many threads. Signed-off-by: Cyril Bur Signed-off-by: Michael Ellerman

selftests/powerpc: Test the preservation of FPU and VMX regs across syscall

2016-03-02T12:34:46+00:00

Test that the non volatile floating point and Altivec registers get correctly preserved across the fork() syscall. fork() works nicely for this purpose, the registers should be the same for both parent and child Signed-off-by: Cyril Bur [mpe: Add include guards to basic_asm.h, minor formatting] Signed-off-by: Michael Ellerman

selftests/powerpc: Remove -flto from common CFLAGS

2016-03-02T12:34:46+00:00

LTO can cause GCC to inline some functions which have attributes set. The act of inlining the functions can lead to GCC forgetting about the attributes which leads to incorrect tests. Notable example being: __attribute__((__target__("no-vsx"))) LTO can also interact strangely with custom assembly functions and cause tests to intermittently fail. Both these cases are hard to detect and require manual inspection of binaries which is unlikely to happen for all tests. Furthermore, LTO optimisations are not necessary for selftests and correctness is paramount and as such it is best to disable LTO. LTO can be enabled on a per test basis. A pseries_le_defconfig kernel on a POWER8 was used to determine that the same subset of selftests pass and fail with and without -flto in the common Makefile. Signed-off-by: Suraj Jitindar Singh Reviewed-by: Cyril Bur Signed-off-by: Michael Ellerman

selftests/powerpc: Fix out of bounds access in TM signal test

2016-03-02T12:34:45+00:00

Gcc helpfully points out that we're accessing past the end of the gprs array: tm-signal-msr-resv.c: In function 'signal_usr1': tm-signal-msr-resv.c:43:37: error: array subscript is above array bounds [-Werror=array-bounds] ucp->uc_mcontext.regs->gpr[PT_MSR] |= (7ULL); We haven't noticed previously because -flto was hiding it somehow. The code is confused, PT_MSR isn't a gpr, instead it's in uc_regs->gregs, so fix it. Signed-off-by: Michael Ellerman

selftests/powerpc: Add script to test HMI functionality

2015-12-16T23:46:43+00:00

HMIs (Hypervisor Management|Maintenance Interrupts) are a class of interrupt on POWER systems. HMI support has traditionally been exceptionally difficult to test, however Skiboot ships a tool that, with the correct magic numbers, will inject them. This, therefore, is a first pass at a script to inject HMIs and monitor Linux's response. It injects an HMI on each core on every chip in turn It then watches dmesg to see if it's acknowledged by Linux. On a Tuletta, I observed that we see 8 (or sometimes 9 or more) events per injection, regardless of SMT setting, so we wait for 8 before progressing. It sits in a new scripts/ directory in selftests/powerpc, because it's not designed to be run as part of the regular make selftests process. In particular, it is quite possibly going to end up garding lots of your CPUs, so it should only be run if you know how to undo that. CC: Mahesh J Salgaonkar Signed-off-by: Daniel Axtens Signed-off-by: Michael Ellerman

selftests/powerpc: Make context_switch touch FP/altivec/vector by default

2015-12-16T23:46:43+00:00

Simply because it touches more code paths that way, and therefore tests more things. Signed-off-by: Michael Ellerman Acked-by: Anton Blanchard

selftests/powerpc: Make context_switch do something with no args

2015-12-16T23:46:42+00:00

For ease of use make the context_switch test do something useful when called with no arguments. Default to a 30 second run, using threads, doing yield, and use any online cpu. Make it print out what it's doing to avoid confusion. Signed-off-by: Michael Ellerman Acked-by: Anton Blanchard

selftests/powerpc: Import Anton's context_switch2 benchmark

2015-12-16T23:46:42+00:00

This gets referred to a lot in commit messages, so let's pull it into the selftests. Almost vanilla from: http://ozlabs.org/~anton/junkcode/context_switch2.c Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman Acked-by: Anton Blanchard

selftests/powerpc: Move pick_online_cpu() up into utils.c

2015-12-16T23:46:41+00:00

We want to use this in another test, so make it available at the top of the powerpc selftests tree. Signed-off-by: Michael Ellerman