a65329aa7d
A new self test that forces MSR[TS] to be set without calling any TM instruction. This test also tries to cause a page fault at a signal handler, exactly between MSR[TS] set and tm_recheckpoint(), forcing thread->texasr to be rewritten with TEXASR[FS] = 0, which will cause a BUG when tm_recheckpoint() is called. This test is not deterministic, since it is hard to guarantee that the page access will cause a page fault. In order to force more page faults at signal context, the signal handler and the ucontext are being mapped into a MADV_DONTNEED memory chunks. Tests have shown that the bug could be exposed with few interactions in a buggy kernel. This test is configured to loop 5000x, having a good chance to hit the kernel issue in just one run. This self test takes less than two seconds to run. This test uses set/getcontext because the kernel will recheckpoint zeroed structures, causing the test to segfault, which is undesired because the test needs to rerun, so, there is a signal handler for SIGSEGV which will restart the test. v2: Uses the MADV_DONTNEED memory advice v3: Fix memcpy and 32-bits compilation v4: Does not define unused macros Signed-off-by: Breno Leitao <leitao@debian.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/*
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* Copyright 2013, Michael Ellerman, IBM Corp.
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* Licensed under GPLv2.
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*/
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#ifndef _SELFTESTS_POWERPC_UTILS_H
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#define _SELFTESTS_POWERPC_UTILS_H
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#define __cacheline_aligned __attribute__((aligned(128)))
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#include <stdint.h>
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#include <stdbool.h>
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#include <linux/auxvec.h>
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#include <linux/perf_event.h>
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#include "reg.h"
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/* Avoid headaches with PRI?64 - just use %ll? always */
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typedef unsigned long long u64;
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typedef signed long long s64;
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/* Just for familiarity */
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typedef uint32_t u32;
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typedef uint16_t u16;
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typedef uint8_t u8;
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void test_harness_set_timeout(uint64_t time);
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int test_harness(int (test_function)(void), char *name);
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int read_auxv(char *buf, ssize_t buf_size);
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void *find_auxv_entry(int type, char *auxv);
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void *get_auxv_entry(int type);
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int pick_online_cpu(void);
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int read_debugfs_file(char *debugfs_file, int *result);
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int write_debugfs_file(char *debugfs_file, int result);
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void set_dscr(unsigned long val);
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int perf_event_open_counter(unsigned int type,
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unsigned long config, int group_fd);
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int perf_event_enable(int fd);
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int perf_event_disable(int fd);
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int perf_event_reset(int fd);
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static inline bool have_hwcap(unsigned long ftr)
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{
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return ((unsigned long)get_auxv_entry(AT_HWCAP) & ftr) == ftr;
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}
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#ifdef AT_HWCAP2
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static inline bool have_hwcap2(unsigned long ftr2)
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{
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return ((unsigned long)get_auxv_entry(AT_HWCAP2) & ftr2) == ftr2;
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}
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#else
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static inline bool have_hwcap2(unsigned long ftr2)
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{
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return false;
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}
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#endif
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bool is_ppc64le(void);
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/* Yes, this is evil */
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#define FAIL_IF(x) \
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do { \
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if ((x)) { \
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fprintf(stderr, \
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"[FAIL] Test FAILED on line %d\n", __LINE__); \
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return 1; \
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} \
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} while (0)
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/* The test harness uses this, yes it's gross */
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#define MAGIC_SKIP_RETURN_VALUE 99
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#define SKIP_IF(x) \
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do { \
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if ((x)) { \
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fprintf(stderr, \
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"[SKIP] Test skipped on line %d\n", __LINE__); \
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return MAGIC_SKIP_RETURN_VALUE; \
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} \
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} while (0)
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#define SKIP_IF_MSG(x, msg) \
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do { \
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if ((x)) { \
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fprintf(stderr, \
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"[SKIP] Test skipped on line %d: %s\n", \
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__LINE__, msg); \
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return MAGIC_SKIP_RETURN_VALUE; \
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} \
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} while (0)
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#define _str(s) #s
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#define str(s) _str(s)
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/* POWER9 feature */
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#ifndef PPC_FEATURE2_ARCH_3_00
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#define PPC_FEATURE2_ARCH_3_00 0x00800000
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#endif
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#if defined(__powerpc64__)
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#define UCONTEXT_NIA(UC) (UC)->uc_mcontext.gp_regs[PT_NIP]
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#define UCONTEXT_MSR(UC) (UC)->uc_mcontext.gp_regs[PT_MSR]
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#elif defined(__powerpc__)
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#define UCONTEXT_NIA(UC) (UC)->uc_mcontext.uc_regs->gregs[PT_NIP]
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#define UCONTEXT_MSR(UC) (UC)->uc_mcontext.uc_regs->gregs[PT_MSR]
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#else
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#error implement UCONTEXT_NIA
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#endif
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#endif /* _SELFTESTS_POWERPC_UTILS_H */
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