kernel/linux.git/tools/testing/selftests/powerpc/include, branch v6.1.168

selftests/powerpc/ptrace: Do more of ptrace-gpr in asm

2022-07-25T02:05:16+00:00

The ptrace-gpr test includes some inline asm to load GPR and FPR registers. It then goes back to C to wait for the parent to trace it and then checks register contents. The split between inline asm and C is fragile, it relies on the compiler not using any non-volatile GPRs after the inline asm block. It also requires a very large and unwieldy inline asm block. So convert the logic to set registers, wait, and store registers to a single asm function, meaning there's no window for the compiler to intervene. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220627140239.2464900-10-mpe@ellerman.id.au

selftests/powerpc/ptrace: Convert to load/store doubles

2022-07-25T02:05:16+00:00

Some of the ptrace tests check the contents of floating pointer registers. Currently these use float, which is always 4 bytes, but the ptrace API supports saving/restoring 8 bytes per register, so switch to using doubles to exercise the code more fully. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220627140239.2464900-8-mpe@ellerman.id.au

selftests/powerpc/ptrace: Drop unused load_fpr_single_precision()

2022-07-25T02:05:16+00:00

This function is never called, drop it. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220627140239.2464900-7-mpe@ellerman.id.au

selftests/powerpc: Add 32-bit support to asm helpers

2022-07-25T02:05:16+00:00

Add support for 32-bit builds to the asm helpers. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220627140239.2464900-6-mpe@ellerman.id.au

selftests/powerpc: Don't save TOC by default in asm helpers

2022-07-25T02:05:15+00:00

Thare are some asm helpers for creating/popping stack frames in basic_asm.h. They always save/restore r2 (TOC pointer), but none of the selftests change r2, so it's unnecessary to save it by default. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220627140239.2464900-5-mpe@ellerman.id.au

selftests/powerpc: Don't save CR by default in asm helpers

2022-07-25T02:05:15+00:00

Thare are some asm helpers for creating/popping stack frames in basic_asm.h. They always save/restore CR, but none of the selftests tests touch non-volatile CR fields, so it's unnecessary to save them by default. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220627140239.2464900-4-mpe@ellerman.id.au

selftests/powerpc: Ensure 16-byte stack pointer alignment

2022-07-25T02:05:15+00:00

The PUSH/POP_BASIC_STACK helpers in basic_asm.h do not ensure that the stack pointer is always 16-byte aligned, which is required per the ABI. Fix the macros to do the alignment if the caller fails to. Currently only one caller passes a non-aligned size, tm_signal_self(), which hasn't been caught in testing, presumably because it's a leaf function. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220627140239.2464900-1-mpe@ellerman.id.au

selftests/powerpc/pmu: Refactor the platform check and add macros to find array size/PVR

2022-06-28T22:57:39+00:00

The platform check for selftest support "check_pvr_for_sampling_tests" is specific to sampling tests which includes PVR check, presence of PMU and extended regs support. Extended regs support is needed for sampling tests which tests whether PMU registers are programmed correctly. There could be other sampling tests which may not need extended regs, example, bhrb filter tests which only needs validity check via event open. Hence refactor the platform check to have a common function "platform_check_for_tests" that checks only for PVR check and presence of PMU. The existing function "check_pvr_for_sampling_tests" will invoke the common function and also will include checks for extended regs specific for sampling. The common function can also be used by tests other than sampling like event code tests. Add macro to find array size ("ARRAY_SIZE") to sampling tests "misc.h" file. This can be used in next tests to find event array size. Also update "include/reg.h" to add macros to find minor and major version from PVR which will be used in testcases. Signed-off-by: Athira Rajeev Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-10-atrajeev@linux.vnet.ibm.com

selftests/powerpc: Add support to fetch "platform" and "base platform" from auxv to detect platform.

2022-06-28T13:56:46+00:00

The /proc/self/auxv contains information about "platform" on any system. Also "base platform" which is an indication about platform string corresponding to the real PVR. When systems are booted in compat mode, say, power10 booted in power9 mode, "platform" will point to power9 whereas base platform will point to power10. Incase, if the distro doesn't support platform indicated by real PVR, base platform will have a default value. The mismatch of platform/base platform is an indication of system booted in compat mode. In such cases, distro will have a Generic Compat registered which supports basic features for performance monitoring. Some of the selftest needs to be handled differently ( ex: generic events, alternative events, bhrb filter map) in Generic Compat PMU. Hence selftest framework needs utility functions to identify such cases. One way is make sure of auxv information. Below condition can be used to detect if Generic Compat PMU is registered. ie: if ((AT_PLATFORM != AT_BASE_PLATFORM) && (AT_BASE_PLATFORM != PVR)) this indicates Generic Compat PMU. Add utility function in "include/utils.h" to return: AT_PLATFORM and AT_BASE_PLATFORM from auxv. Also update misc.c in "sampling_tests" folder to add function to use above check to determine presence of generic compat pmu. In other architecture ( like x86 ), pmu_name is exposed via "/sys/bus/event_source/devices/cpu/caps". The same could be used in powerpc in future. Since currently we don't have the "caps" support in powerpc, patch uses auxv information to detect platform type and compat mode. But as placeholder utility function is added considering possiblity of getting "caps" information via sysfs. If that doesn't exist, fallback to using auxv information. Signed-off-by: Athira Rajeev Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-3-atrajeev@linux.vnet.ibm.com

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

2022-04-27T06:32:42+00:00

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