a069b5f980
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 <atrajeev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220610134113.62991-3-atrajeev@linux.vnet.ibm.com
163 lines
3.7 KiB
C
163 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright 2013, Michael Ellerman, IBM Corp.
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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 <asm/cputable.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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int read_sysfs_file(char *debugfs_file, char *result, size_t result_size);
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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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struct perf_event_read {
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__u64 nr;
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__u64 l1d_misses;
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};
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#if !defined(__GLIBC_PREREQ) || !__GLIBC_PREREQ(2, 30)
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#include <unistd.h>
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#include <sys/syscall.h>
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static inline pid_t gettid(void)
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{
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return syscall(SYS_gettid);
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}
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#endif
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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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static inline char *auxv_base_platform(void)
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{
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return ((char *)get_auxv_entry(AT_BASE_PLATFORM));
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}
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static inline char *auxv_platform(void)
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{
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return ((char *)get_auxv_entry(AT_PLATFORM));
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}
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bool is_ppc64le(void);
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int using_hash_mmu(bool *using_hash);
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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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#define FAIL_IF_EXIT(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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_exit(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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#define sigsafe_err(msg) ({ \
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ssize_t nbytes __attribute__((unused)); \
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nbytes = write(STDERR_FILENO, msg, strlen(msg)); })
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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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/* POWER10 feature */
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#ifndef PPC_FEATURE2_ARCH_3_1
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#define PPC_FEATURE2_ARCH_3_1 0x00040000
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#endif
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/* POWER10 features */
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#ifndef PPC_FEATURE2_MMA
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#define PPC_FEATURE2_MMA 0x00020000
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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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