linux-dev/tools/testing/selftests/powerpc/include/utils.h, branch linus/master

selftests/powerpc: Add matrix multiply assist (MMA) test

2022-04-27T06:32:42Z

Adds a simple test of some basic matrix multiply assist (MMA) instructions. Signed-off-by: Alistair Popple Tested-by: Joel Stanley Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200622021832.15870-1-alistair@popple.id.au

selftests/powerpc: refactor entry and rfi_flush tests

2020-11-19T12:47:23Z

For simplicity in backporting, the original entry_flush test contained a lot of duplicated code from the rfi_flush test. De-duplicate that code. Signed-off-by: Daniel Axtens Signed-off-by: Michael Ellerman

selftests/powerpc: Include asm/cputable.h from utils.h

2020-09-08T12:23:59Z

utils.h provides have_hwcap() and have_hwcap2() which check for a feature bit. Those bits are defined in asm/cputable.h, so include it in utils.h so users of utils.h don't have to do it manually. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200819015727.1977134-4-mpe@ellerman.id.au

selftests/powerpc: Move set_dscr() into rfi_flush.c

2020-09-08T12:23:57Z

This version of set_dscr() was added for the RFI flush test, and is fairly specific to it. It also clashes with the version of set_dscr() in dscr/dscr.h. So move it into the RFI flush test where it's used. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200819015727.1977134-3-mpe@ellerman.id.au

selftests/powerpc: Add wrapper for gettid

2020-07-29T11:02:10Z

The gettid() syscall wrapper was first introduced in glibc 2.30. This adds a wrapper for use in distros running older versions. Suggested-by: Christophe Leroy Suggested-by: Michael Ellerman Signed-off-by: Sandipan Das Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/8ca3b0eeda989707815d1cf337cc33f090408965.1595821792.git.sandipan@linux.ibm.com

selftests/powerpc: Add helper to exit on failure

2020-07-29T11:02:10Z

This adds a helper similar to FAIL_IF() which lets a program exit with code 1 (to indicate failure) when the given condition is true. Signed-off-by: Sandipan Das Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/dac282d5c2e96e7816dc522e4e20d56d7c79c898.1595821792.git.sandipan@linux.ibm.com

selftests/powerpc: Move pkey helpers to headers

2020-07-29T11:02:10Z

This moves all the pkey-related helpers to a new header file and also a helper to print error messages in signal handlers to the existing utils header file. Signed-off-by: Sandipan Das Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/28e633fa9ec1a6500c12188e09ea1887b10a10c1.1595821792.git.sandipan@linux.ibm.com

selftests/powerpc: Move Hash MMU check to utilities

2020-06-30T04:37:51Z

This moves a function to test if the MMU is in Hash mode under the generic test utilities. Signed-off-by: Sandipan Das Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200604125610.649668-3-sandipan@linux.ibm.com

selftests/powerpc: Add prefixed loads/stores to alignment_handler test

2020-06-22T04:18:45Z

Extend the alignment handler selftest to exercise prefixed load store instructions. Add tests for prefixed VSX, floating point and integer instructions. Skip prefix tests if ISA version does not support prefixed instructions. Signed-off-by: Jordan Niethe Tested-by: Alistair Popple [mpe: Fixup PPC_FEATURE2_ARCH_3_1 naming as noted by Alistair] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200520021103.19798-2-jniethe5@gmail.com

selftests/powerpc: Add a test of spectre_v2 mitigations

2019-10-30T04:43:57Z

This test uses the PMU to count branch prediction hits/misses for a known loop, and compare the result to the reported spectre v2 mitigation. This gives us a way of sanity checking that the reported mitigation is actually in effect. Sample output for some cases, eg: Power9: sysfs reports: 'Vulnerable' PM_BR_PRED_CCACHE: result 368 running/enabled 5792777124 PM_BR_MPRED_CCACHE: result 319 running/enabled 5792775546 PM_BR_PRED_PCACHE: result 2147483281 running/enabled 5792773128 PM_BR_MPRED_PCACHE: result 213604201 running/enabled 5792771640 Miss percent 9 % OK - Measured branch prediction rates match reported spectre v2 mitigation. sysfs reports: 'Mitigation: Indirect branch serialisation (kernel only)' PM_BR_PRED_CCACHE: result 895 running/enabled 5780320920 PM_BR_MPRED_CCACHE: result 822 running/enabled 5780312414 PM_BR_PRED_PCACHE: result 2147482754 running/enabled 5780308836 PM_BR_MPRED_PCACHE: result 213639731 running/enabled 5780307912 Miss percent 9 % OK - Measured branch prediction rates match reported spectre v2 mitigation. sysfs reports: 'Mitigation: Indirect branch cache disabled' PM_BR_PRED_CCACHE: result 2147483649 running/enabled 20540186160 PM_BR_MPRED_CCACHE: result 2147483649 running/enabled 20540180056 PM_BR_PRED_PCACHE: result 0 running/enabled 20540176090 PM_BR_MPRED_PCACHE: result 0 running/enabled 20540174182 Miss percent 100 % OK - Measured branch prediction rates match reported spectre v2 mitigation. Power8: sysfs reports: 'Vulnerable' PM_BR_PRED_CCACHE: result 2147483649 running/enabled 3505888142 PM_BR_MPRED_CCACHE: result 9 running/enabled 3505882788 Miss percent 0 % OK - Measured branch prediction rates match reported spectre v2 mitigation. sysfs reports: 'Mitigation: Indirect branch cache disabled' PM_BR_PRED_CCACHE: result 2147483649 running/enabled 16931421988 PM_BR_MPRED_CCACHE: result 2147483649 running/enabled 16931416478 Miss percent 100 % OK - Measured branch prediction rates match reported spectre v2 mitigation. success: spectre_v2 Signed-off-by: Michael Ellerman Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190520105520.22274-1-mpe@ellerman.id.au