kernel/linux.git/tools/testing/selftests/powerpc/utils.c, branch v5.4.168

selftests/powerpc: Fix online CPU selection

2020-08-19T06:16:18+00:00

[ Upstream commit dfa03fff86027e58c8dba5c03ae68150d4e513ad ] The size of the CPU affinity mask must be large enough for systems with a very large number of CPUs. Otherwise, tests which try to determine the first online CPU by calling sched_getaffinity() will fail. This makes sure that the size of the allocated affinity mask is dependent on the number of CPUs as reported by get_nprocs_conf(). Fixes: 3752e453f6ba ("selftests/powerpc: Add tests of PMU EBBs") Reported-by: Shirisha Ganta Signed-off-by: Sandipan Das Reviewed-by: Kamalesh Babulal Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/a408c4b8e9a23bb39b539417a21eb0ff47bb5127.1596084858.git.sandipan@linux.ibm.com Signed-off-by: Sasha Levin

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 191

2019-05-30T18:29:21+00:00

Based on 1 normalized pattern(s): licensed under gplv2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 99 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Alexios Zavras Reviewed-by: Richard Fontana Reviewed-by: Allison Randal Reviewed-by: Steve Winslow Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528170027.163048684@linutronix.de Signed-off-by: Greg Kroah-Hartman

selftests/powerpc: Fix compilation issue due to asm label

2018-10-31T23:06:03+00:00

We are using 'dscr_insn' as a label in inline asm to identify if a SIGILL was generated by the mtspr instruction at that point. However, with inline assembly, the compiler is still free to duplicate the asm statement for optimization purposes, which results in the label being defined twice with the error: /tmp/ccerQCql.s:874: Error: symbol `dscr_insn' is already defined With different compiler versions, we may also see: /tmp/ccJzLDlN.o:(.toc+0x0): undefined reference to `dscr_insn' Remove the use of the label in the inline assembly. Instead, just look for the offending instruction in the signal handler. Fixes: d2bf793237b3 ("selftests/powerpc: Add test to verify rfi flush across a system call") Reported-by: Breno Leitao Signed-off-by: Naveen N. Rao Tested-by: Breno Leitao Signed-off-by: Michael Ellerman

selftests/powerpc: Add test to verify rfi flush across a system call

2018-10-20T02:26:47+00:00

This adds a test to verify proper functioning of the rfi flush capability implemented to mitigate meltdown. The test works by measuring the number of L1d cache misses encountered while loading data from memory. Across a system call, since the L1d cache is flushed when rfi_flush is enabled, the number of cache misses is expected to be relative to the number of cachelines corresponding to the data being loaded. The current system setting is reflected via powerpc/rfi_flush under debugfs (assumed to be /sys/kernel/debug/). This test verifies the expected result with rfi_flush enabled as well as when it is disabled. Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman Signed-off-by: Naveen N. Rao [mpe: Add SPDX tags, clang format, skip if the debugfs is missing, use __u64 and SANE_USERSPACE_TYPES to avoid printf() build errors.] Signed-off-by: Michael Ellerman

selftests/powerpc: Add a helper for checking if we're on ppc64le

2018-08-07T11:49:25+00:00

Some of our selftests have only been tested on ppc64le and crash or behave weirdly on ppc64/ppc32. So add a helper for checking the UTS machine. Signed-off-by: Michael Ellerman

selftests/powerpc: Refactor the AUXV routines

2017-03-20T08:02:49+00:00

Refactor the AUXV routines so they are more composable. In a future test we want to look for many AUXV entries and we don't want to have to read /proc/self/auxv each time. Signed-off-by: Michael Ellerman

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

selftests/powerpc: Move get_auxv_entry() into utils.c

2015-12-14T09:41:47+00:00

This doesn't really belong in harness.c, it's a helper function. So move it into utils.c. Signed-off-by: Michael Ellerman