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/*
* Copyright 2015, Sam Bobroff, IBM Corp.
* Licensed under GPLv2.
*
* Test the kernel's system call code to ensure that a system call
* made from within an active HTM transaction is aborted with the
* correct failure code.
* Conversely, ensure that a system call made from within a
* suspended transaction can succeed.
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <asm/tm.h>
#include <asm/cputable.h>
#include <linux/auxvec.h>
#include <sys/time.h>
#include <stdlib.h>
#include "utils.h"
extern int getppid_tm_active(void);
extern int getppid_tm_suspended(void);
unsigned retries = 0;
#define TEST_DURATION 10 /* seconds */
#define TM_RETRIES 100
long failure_code(void)
{
return __builtin_get_texasru() >> 24;
}
bool failure_is_persistent(void)
{
return (failure_code() & TM_CAUSE_PERSISTENT) == TM_CAUSE_PERSISTENT;
}
bool failure_is_syscall(void)
{
return (failure_code() & TM_CAUSE_SYSCALL) == TM_CAUSE_SYSCALL;
}
pid_t getppid_tm(bool suspend)
{
int i;
pid_t pid;
for (i = 0; i < TM_RETRIES; i++) {
if (suspend)
pid = getppid_tm_suspended();
else
pid = getppid_tm_active();
if (pid >= 0)
return pid;
if (failure_is_persistent()) {
if (failure_is_syscall())
return -1;
printf("Unexpected persistent transaction failure.\n");
printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
__builtin_get_texasr(), __builtin_get_tfiar());
exit(-1);
}
retries++;
}
printf("Exceeded limit of %d temporary transaction failures.\n", TM_RETRIES);
printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
__builtin_get_texasr(), __builtin_get_tfiar());
exit(-1);
}
static inline bool have_htm_nosc(void)
{
#ifdef PPC_FEATURE2_HTM_NOSC
return ((long)get_auxv_entry(AT_HWCAP2) & PPC_FEATURE2_HTM_NOSC);
#else
printf("PPC_FEATURE2_HTM_NOSC not defined, can't check AT_HWCAP2\n");
return false;
#endif
}
int tm_syscall(void)
{
unsigned count = 0;
struct timeval end, now;
SKIP_IF(!have_htm_nosc());
setbuf(stdout, NULL);
printf("Testing transactional syscalls for %d seconds...\n", TEST_DURATION);
gettimeofday(&end, NULL);
now.tv_sec = TEST_DURATION;
now.tv_usec = 0;
timeradd(&end, &now, &end);
for (count = 0; timercmp(&now, &end, <); count++) {
/*
* Test a syscall within a suspended transaction and verify
* that it succeeds.
*/
FAIL_IF(getppid_tm(true) == -1); /* Should succeed. */
/*
* Test a syscall within an active transaction and verify that
* it fails with the correct failure code.
*/
FAIL_IF(getppid_tm(false) != -1); /* Should fail... */
FAIL_IF(!failure_is_persistent()); /* ...persistently... */
FAIL_IF(!failure_is_syscall()); /* ...with code syscall. */
gettimeofday(&now, 0);
}
printf("%d active and suspended transactions behaved correctly.\n", count);
printf("(There were %d transaction retries.)\n", retries);
return 0;
}
int main(void)
{
return test_harness(tm_syscall, "tm_syscall");
}
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