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[69.172.146.21]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20794600fe8sm90481625ad.68.2024.09.20.00.49.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Sep 2024 00:49:50 -0700 (PDT) From: Tony Ambardar To: bpf@vger.kernel.org Cc: Tony Ambardar , linux-kselftest@vger.kernel.org, Andrii Nakryiko , Eduard Zingerman , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan , Jean-Philippe Brucker , Viktor Malik Subject: [PATCH bpf-next v1 3/3] tools/bpf, selftests/bpf : Sync btf_ids.h to tools Date: Fri, 20 Sep 2024 00:49:13 -0700 Message-Id: <728fd3a356ae5f9a0c0a84d8b9fc6af1bcd22c1d.1726806756.git.tony.ambardar@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Update to include latest changes, including BTF_SET8 support and correct alignment of .BTF_ids sections, and remove the now-redundant alignment fix introduced in 3effc06a4dde ("selftests/bpf: Fix alignment of .BTF_ids"). CC: Jean-Philippe Brucker Signed-off-by: Tony Ambardar --- tools/include/linux/btf_ids.h | 80 +++++++++++++++++-- .../selftests/bpf/prog_tests/resolve_btfids.c | 6 -- 2 files changed, 74 insertions(+), 12 deletions(-) diff --git a/tools/include/linux/btf_ids.h b/tools/include/linux/btf_ids.h index 72ea363d434d..3ba37d00e3ae 100644 --- a/tools/include/linux/btf_ids.h +++ b/tools/include/linux/btf_ids.h @@ -10,6 +10,9 @@ struct btf_id_set { u32 ids[]; }; +/* This flag implies BTF_SET8 holds kfunc(s) */ +#define BTF_SET8_KFUNCS (1 << 0) + struct btf_id_set8 { u32 cnt; u32 flags; @@ -21,7 +24,8 @@ struct btf_id_set8 { #ifdef CONFIG_DEBUG_INFO_BTF -#include /* for __PASTE */ +#include /* for __PASTE and __maybe_unused */ +#include /* * Following macros help to define lists of BTF IDs placed @@ -35,7 +39,7 @@ struct btf_id_set8 { #define BTF_IDS_SECTION ".BTF_ids" -#define ____BTF_ID(symbol) \ +#define ____BTF_ID(symbol, word) \ asm( \ ".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ ".local " #symbol " ; \n" \ @@ -43,10 +47,11 @@ asm( \ ".size " #symbol ", 4; \n" \ #symbol ": \n" \ ".zero 4 \n" \ +word \ ".popsection; \n"); -#define __BTF_ID(symbol) \ - ____BTF_ID(symbol) +#define __BTF_ID(symbol, word) \ + ____BTF_ID(symbol, word) #define __ID(prefix) \ __PASTE(__PASTE(prefix, __COUNTER__), __LINE__) @@ -56,7 +61,14 @@ asm( \ * to 4 zero bytes. */ #define BTF_ID(prefix, name) \ - __BTF_ID(__ID(__BTF_ID__##prefix##__##name##__)) + __BTF_ID(__ID(__BTF_ID__##prefix##__##name##__), "") + +#define ____BTF_ID_FLAGS(prefix, name, flags) \ + __BTF_ID(__ID(__BTF_ID__##prefix##__##name##__), ".long " #flags "\n") +#define __BTF_ID_FLAGS(prefix, name, flags, ...) \ + ____BTF_ID_FLAGS(prefix, name, flags) +#define BTF_ID_FLAGS(prefix, name, ...) \ + __BTF_ID_FLAGS(prefix, name, ##__VA_ARGS__, 0) /* * The BTF_ID_LIST macro defines pure (unsorted) list @@ -76,6 +88,7 @@ asm( \ #define __BTF_ID_LIST(name, scope) \ asm( \ ".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ +".balign 4, 0; \n" \ "." #scope " " #name "; \n" \ #name ":; \n" \ ".popsection; \n"); @@ -155,10 +168,58 @@ asm( \ ".popsection; \n"); \ extern struct btf_id_set name; +/* + * The BTF_SET8_START/END macros pair defines sorted list of + * BTF IDs and their flags plus its members count, with the + * following layout: + * + * BTF_SET8_START(list) + * BTF_ID_FLAGS(type1, name1, flags) + * BTF_ID_FLAGS(type2, name2, flags) + * BTF_SET8_END(list) + * + * __BTF_ID__set8__list: + * .zero 8 + * list: + * __BTF_ID__type1__name1__3: + * .zero 4 + * .word (1 << 0) | (1 << 2) + * __BTF_ID__type2__name2__5: + * .zero 4 + * .word (1 << 3) | (1 << 1) | (1 << 2) + * + */ +#define __BTF_SET8_START(name, scope, flags) \ +__BTF_ID_LIST(name, local) \ +asm( \ +".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ +"." #scope " __BTF_ID__set8__" #name "; \n" \ +"__BTF_ID__set8__" #name ":; \n" \ +".zero 4 \n" \ +".long " __stringify(flags) "\n" \ +".popsection; \n"); + +#define BTF_SET8_START(name) \ +__BTF_SET8_START(name, local, 0) + +#define BTF_SET8_END(name) \ +asm( \ +".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ +".size __BTF_ID__set8__" #name ", .-" #name " \n" \ +".popsection; \n"); \ +extern struct btf_id_set8 name; + +#define BTF_KFUNCS_START(name) \ +__BTF_SET8_START(name, local, BTF_SET8_KFUNCS) + +#define BTF_KFUNCS_END(name) \ +BTF_SET8_END(name) + #else -#define BTF_ID_LIST(name) static u32 __maybe_unused name[5]; +#define BTF_ID_LIST(name) static u32 __maybe_unused name[64]; #define BTF_ID(prefix, name) +#define BTF_ID_FLAGS(prefix, name, ...) #define BTF_ID_UNUSED #define BTF_ID_LIST_GLOBAL(name, n) u32 __maybe_unused name[n]; #define BTF_ID_LIST_SINGLE(name, prefix, typename) static u32 __maybe_unused name[1]; @@ -166,6 +227,10 @@ extern struct btf_id_set name; #define BTF_SET_START(name) static struct btf_id_set __maybe_unused name = { 0 }; #define BTF_SET_START_GLOBAL(name) static struct btf_id_set __maybe_unused name = { 0 }; #define BTF_SET_END(name) +#define BTF_SET8_START(name) static struct btf_id_set8 __maybe_unused name = { 0 }; +#define BTF_SET8_END(name) +#define BTF_KFUNCS_START(name) static struct btf_id_set8 __maybe_unused name = { .flags = BTF_SET8_KFUNCS }; +#define BTF_KFUNCS_END(name) #endif /* CONFIG_DEBUG_INFO_BTF */ @@ -215,5 +280,8 @@ MAX_BTF_TRACING_TYPE, }; extern u32 btf_tracing_ids[]; +extern u32 bpf_cgroup_btf_id[]; +extern u32 bpf_local_storage_map_btf_id[]; +extern u32 btf_bpf_map_id[]; #endif diff --git a/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c b/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c index 51544372f52e..c3c021e3783e 100644 --- a/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c +++ b/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c @@ -28,12 +28,6 @@ struct symbol test_symbols[] = { { "func", BTF_KIND_FUNC, -1 }, }; -/* Align the .BTF_ids section to 4 bytes */ -asm ( -".pushsection " BTF_IDS_SECTION " ,\"a\"; \n" -".balign 4, 0; \n" -".popsection; \n"); - BTF_ID_LIST(test_list_local) BTF_ID_UNUSED BTF_ID(typedef, S)