tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
selftests/powerpc: Add transactional syscall test
Check that a syscall made during an active transaction will fail with
the correct failure code and that one made during a suspended
transaction will succeed.
Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
authored by
Sam bobroff
and committed by
Michael Ellerman
7fe924d9
2b03fc1d
+153
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+4
-1
tools/testing/selftests/powerpc/tm/Makefile
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tools/testing/selftests/powerpc/tm/Makefile
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tools/testing/selftests/powerpc/tm/tm-syscall-asm.S
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tools/testing/selftests/powerpc/tm/tm-syscall-asm.S
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#include <ppc-asm.h>
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#include <asm/unistd.h>
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.text
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FUNC_START(getppid_tm_active)
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tbegin.
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beq 1f
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li r0, __NR_getppid
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sc
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tend.
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blr
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1:
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li r3, -1
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blr
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FUNC_START(getppid_tm_suspended)
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tbegin.
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beq 1f
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li r0, __NR_getppid
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tsuspend.
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sc
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tresume.
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tend.
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blr
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1:
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li r3, -1
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blr
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tools/testing/selftests/powerpc/tm/tm-syscall.c
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tools/testing/selftests/powerpc/tm/tm-syscall.c
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/*
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* Copyright 2015, Sam Bobroff, IBM Corp.
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* Licensed under GPLv2.
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*
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* Test the kernel's system call code to ensure that a system call
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* made from within an active HTM transaction is aborted with the
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* correct failure code.
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* Conversely, ensure that a system call made from within a
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* suspended transaction can succeed.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <asm/tm.h>
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#include <asm/cputable.h>
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#include <linux/auxvec.h>
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#include <sys/time.h>
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#include <stdlib.h>
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#include "utils.h"
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extern int getppid_tm_active(void);
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extern int getppid_tm_suspended(void);
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unsigned retries = 0;
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#define TEST_DURATION 10 /* seconds */
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#define TM_RETRIES 100
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long failure_code(void)
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{
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return __builtin_get_texasru() >> 24;
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}
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bool failure_is_persistent(void)
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{
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return (failure_code() & TM_CAUSE_PERSISTENT) == TM_CAUSE_PERSISTENT;
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}
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bool failure_is_syscall(void)
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{
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return (failure_code() & TM_CAUSE_SYSCALL) == TM_CAUSE_SYSCALL;
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}
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pid_t getppid_tm(bool suspend)
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{
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int i;
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pid_t pid;
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for (i = 0; i < TM_RETRIES; i++) {
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if (suspend)
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pid = getppid_tm_suspended();
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else
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pid = getppid_tm_active();
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if (pid >= 0)
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return pid;
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if (failure_is_persistent()) {
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if (failure_is_syscall())
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return -1;
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printf("Unexpected persistent transaction failure.\n");
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printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
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__builtin_get_texasr(), __builtin_get_tfiar());
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exit(-1);
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}
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retries++;
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}
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printf("Exceeded limit of %d temporary transaction failures.\n", TM_RETRIES);
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printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
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__builtin_get_texasr(), __builtin_get_tfiar());
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exit(-1);
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}
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int tm_syscall(void)
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{
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unsigned count = 0;
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struct timeval end, now;
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SKIP_IF(!((long)get_auxv_entry(AT_HWCAP2) & PPC_FEATURE2_HTM));
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setbuf(stdout, NULL);
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printf("Testing transactional syscalls for %d seconds...\n", TEST_DURATION);
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gettimeofday(&end, NULL);
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now.tv_sec = TEST_DURATION;
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now.tv_usec = 0;
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timeradd(&end, &now, &end);
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for (count = 0; timercmp(&now, &end, <); count++) {
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/*
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* Test a syscall within a suspended transaction and verify
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* that it succeeds.
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*/
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FAIL_IF(getppid_tm(true) == -1); /* Should succeed. */
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/*
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* Test a syscall within an active transaction and verify that
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* it fails with the correct failure code.
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*/
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FAIL_IF(getppid_tm(false) != -1); /* Should fail... */
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FAIL_IF(!failure_is_persistent()); /* ...persistently... */
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FAIL_IF(!failure_is_syscall()); /* ...with code syscall. */
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gettimeofday(&now, 0);
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}
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printf("%d active and suspended transactions behaved correctly.\n", count);
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printf("(There were %d transaction retries.)\n", retries);
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return 0;
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}
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int main(void)
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{
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return test_harness(tm_syscall, "tm_syscall");
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}