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287dcc2b0c
This adds a test for the recently added RISC-V interface for probing hardware capabilities. It happens to be the first selftest we have for RISC-V, so I've added some infrastructure for those as well. Co-developed-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Evan Green <evan@rivosinc.com> Link: https://lore.kernel.org/r/20230407231103.2622178-6-evan@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <stddef.h>
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#include <asm/hwprobe.h>
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/*
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* Rather than relying on having a new enough libc to define this, just do it
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* ourselves. This way we don't need to be coupled to a new-enough libc to
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* contain the call.
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*/
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long riscv_hwprobe(struct riscv_hwprobe *pairs, size_t pair_count,
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size_t cpu_count, unsigned long *cpus, unsigned int flags);
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int main(int argc, char **argv)
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{
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struct riscv_hwprobe pairs[8];
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unsigned long cpus;
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long out;
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/* Fake the CPU_SET ops. */
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cpus = -1;
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/*
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* Just run a basic test: pass enough pairs to get up to the base
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* behavior, and then check to make sure it's sane.
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*/
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for (long i = 0; i < 8; i++)
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pairs[i].key = i;
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out = riscv_hwprobe(pairs, 8, 1, &cpus, 0);
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if (out != 0)
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return -1;
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for (long i = 0; i < 4; ++i) {
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/* Fail if the kernel claims not to recognize a base key. */
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if ((i < 4) && (pairs[i].key != i))
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return -2;
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if (pairs[i].key != RISCV_HWPROBE_KEY_BASE_BEHAVIOR)
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continue;
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if (pairs[i].value & RISCV_HWPROBE_BASE_BEHAVIOR_IMA)
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continue;
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return -3;
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}
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/*
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* This should also work with a NULL CPU set, but should not work
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* with an improperly supplied CPU set.
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*/
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out = riscv_hwprobe(pairs, 8, 0, 0, 0);
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if (out != 0)
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return -4;
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out = riscv_hwprobe(pairs, 8, 0, &cpus, 0);
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if (out == 0)
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return -5;
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out = riscv_hwprobe(pairs, 8, 1, 0, 0);
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if (out == 0)
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return -6;
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/*
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* Check that keys work by providing one that we know exists, and
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* checking to make sure the resultig pair is what we asked for.
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*/
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pairs[0].key = RISCV_HWPROBE_KEY_BASE_BEHAVIOR;
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out = riscv_hwprobe(pairs, 1, 1, &cpus, 0);
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if (out != 0)
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return -7;
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if (pairs[0].key != RISCV_HWPROBE_KEY_BASE_BEHAVIOR)
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return -8;
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/*
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* Check that an unknown key gets overwritten with -1,
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* but doesn't block elements after it.
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*/
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pairs[0].key = 0x5555;
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pairs[1].key = 1;
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pairs[1].value = 0xAAAA;
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out = riscv_hwprobe(pairs, 2, 0, 0, 0);
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if (out != 0)
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return -9;
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if (pairs[0].key != -1)
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return -10;
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if ((pairs[1].key != 1) || (pairs[1].value == 0xAAAA))
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return -11;
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return 0;
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}
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