perf bpf: Remove now unused BPF headers

Example code has migrated to use standard BPF header files, remove
unnecessary perf equivalents. Update install step to not try to copy
these.

Signed-off-by: Ian Rogers <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/Makefile.perf

···
 	$(call QUIET_INSTALL, libexec) \
 		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
 ifndef NO_LIBBPF
-	$(call QUIET_INSTALL, bpf-headers) \
-		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perf_include_instdir_SQ)/bpf'; \
-		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perf_include_instdir_SQ)/bpf/linux'; \
-		$(INSTALL) include/bpf/*.h -m 644 -t '$(DESTDIR_SQ)$(perf_include_instdir_SQ)/bpf'; \
-		$(INSTALL) include/bpf/linux/*.h -m 644 -t '$(DESTDIR_SQ)$(perf_include_instdir_SQ)/bpf/linux'
 	$(call QUIET_INSTALL, bpf-examples) \
 		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perf_examples_instdir_SQ)/bpf'; \
 		$(INSTALL) examples/bpf/*.c -m 644 -t '$(DESTDIR_SQ)$(perf_examples_instdir_SQ)/bpf'

tools/perf/include/bpf/bpf.h

···
-// SPDX-License-Identifier: GPL-2.0
-#ifndef _PERF_BPF_H
-#define _PERF_BPF_H
-
-#include <uapi/linux/bpf.h>
-
-/*
- * A helper structure used by eBPF C program to describe map attributes to
- * elf_bpf loader, taken from tools/testing/selftests/bpf/bpf_helpers.h:
- */
-struct bpf_map {
-        unsigned int type;
-        unsigned int key_size;
-        unsigned int value_size;
-        unsigned int max_entries;
-        unsigned int map_flags;
-        unsigned int inner_map_idx;
-        unsigned int numa_node;
-};
-
-#define bpf_map(name, _type, type_key, type_val, _max_entries)	\
-struct bpf_map SEC("maps") name = {				\
-	.type	     = BPF_MAP_TYPE_##_type,			\
-	.key_size    = sizeof(type_key),			\
-	.value_size  = sizeof(type_val),			\
-	.max_entries = _max_entries,				\
-};								\
-struct ____btf_map_##name {					\
-	type_key key;						\
-	type_val value;                                 	\
-};								\
-struct ____btf_map_##name __attribute__((section(".maps." #name), used)) \
-	____btf_map_##name = { }
-
-/*
- * FIXME: this should receive .max_entries as a parameter, as careful
- *	  tuning of these limits is needed to avoid hitting limits that
- *	  prevents other BPF constructs, such as tracepoint handlers,
- *	  to get installed, with cryptic messages from libbpf, etc.
- *	  For the current need, 'perf trace --filter-pids', 64 should
- *	  be good enough, but this surely needs to be revisited.
- */
-#define pid_map(name, value_type) bpf_map(name, HASH, pid_t, value_type, 64)
-
-static int (*bpf_map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags) = (void *)BPF_FUNC_map_update_elem;
-static void *(*bpf_map_lookup_elem)(struct bpf_map *map, void *key) = (void *)BPF_FUNC_map_lookup_elem;
-
-static void (*bpf_tail_call)(void *ctx, void *map, int index) = (void *)BPF_FUNC_tail_call;
-
-#define SEC(NAME) __attribute__((section(NAME),  used))
-
-#define probe(function, vars) \
-	SEC(#function "=" #function " " #vars) function
-
-#define syscall_enter(name) \
-	SEC("syscalls:sys_enter_" #name) syscall_enter_ ## name
-
-#define syscall_exit(name) \
-	SEC("syscalls:sys_exit_" #name) syscall_exit_ ## name
-
-#define license(name) \
-char _license[] SEC("license") = #name; \
-int _version SEC("version") = LINUX_VERSION_CODE;
-
-static int (*probe_read)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read;
-static int (*probe_read_str)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read_str;
-
-static int (*perf_event_output)(void *, struct bpf_map *, int, void *, unsigned long) = (void *)BPF_FUNC_perf_event_output;
-
-#endif /* _PERF_BPF_H */

tools/perf/include/bpf/linux/socket.h

···
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef _UAPI_LINUX_SOCKET_H
-#define _UAPI_LINUX_SOCKET_H
-
-/*
- * Desired design of maximum size and alignment (see RFC2553)
- */
-#define _K_SS_MAXSIZE	128	/* Implementation specific max size */
-#define _K_SS_ALIGNSIZE	(__alignof__ (struct sockaddr *))
-				/* Implementation specific desired alignment */
-
-typedef unsigned short __kernel_sa_family_t;
-
-struct __kernel_sockaddr_storage {
-	__kernel_sa_family_t	ss_family;		/* address family */
-	/* Following field(s) are implementation specific */
-	char		__data[_K_SS_MAXSIZE - sizeof(unsigned short)];
-				/* space to achieve desired size, */
-				/* _SS_MAXSIZE value minus size of ss_family */
-} __attribute__ ((aligned(_K_SS_ALIGNSIZE)));	/* force desired alignment */
-
-#define sockaddr_storage __kernel_sockaddr_storage
-
-#endif /* _UAPI_LINUX_SOCKET_H */

tools/perf/include/bpf/pid_filter.h

···
-// SPDX-License-Identifier: LGPL-2.1
-
-#ifndef _PERF_BPF_PID_FILTER_
-#define _PERF_BPF_PID_FILTER_
-
-#include <bpf.h>
-
-#define pid_filter(name) pid_map(name, bool)
-
-static int pid_filter__add(struct bpf_map *pids, pid_t pid)
-{
-	bool value = true;
-	return bpf_map_update_elem(pids, &pid, &value, BPF_NOEXIST);
-}
-
-static bool pid_filter__has(struct bpf_map *pids, pid_t pid)
-{
-	return bpf_map_lookup_elem(pids, &pid) != NULL;
-}
-
-#endif // _PERF_BPF_PID_FILTER_

tools/perf/include/bpf/stdio.h

···
-// SPDX-License-Identifier: GPL-2.0
-
-#include <bpf.h>
-
-struct bpf_map SEC("maps") __bpf_stdout__ = {
-       .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
-       .key_size = sizeof(int),
-       .value_size = sizeof(u32),
-       .max_entries = __NR_CPUS__,
-};
-
-#define puts(from) \
-	({ const int __len = sizeof(from); \
-	   char __from[__len] = from; \
-	   perf_event_output(args, &__bpf_stdout__, BPF_F_CURRENT_CPU, \
-			  &__from, __len & (sizeof(from) - 1)); })

tools/perf/include/bpf/unistd.h

···
-// SPDX-License-Identifier: LGPL-2.1
-
-#include <bpf.h>
-
-static int (*bpf_get_current_pid_tgid)(void) = (void *)BPF_FUNC_get_current_pid_tgid;
-
-static pid_t getpid(void)
-{
-	return bpf_get_current_pid_tgid();
-}