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Code Issues Releases Wiki Activity

bpf: Introduce btf_tracing_ids 

Similar to btf_sock_ids, btf_tracing_ids provides btf ID for task_struct,
file, and vm_area_struct via easy to understand format like
btf_tracing_ids[BTF_TRACING_TYPE_[TASK|file|VMA]].

Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20211112150243.1270987-3-songliubraving@fb.com
This commit is contained in:
Song Liu 2021-11-12 07:02:43 -08:00 committed by Alexei Starovoitov
parent 9e2ad638ae
commit d19ddb476a
7 changed files with 29 additions and 17 deletions
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14
include/linux/btf_ids.h
View File

@ -189,6 +189,18 @@ MAX_BTF_SOCK_TYPE,
extern u32 btf_sock_ids[];
#endif
extern u32 btf_task_struct_ids[];
#define BTF_TRACING_TYPE_xxx \
BTF_TRACING_TYPE(BTF_TRACING_TYPE_TASK, task_struct) \
BTF_TRACING_TYPE(BTF_TRACING_TYPE_FILE, file) \
BTF_TRACING_TYPE(BTF_TRACING_TYPE_VMA, vm_area_struct)
enum {
#define BTF_TRACING_TYPE(name, type) name,
BTF_TRACING_TYPE_xxx
#undef BTF_TRACING_TYPE
MAX_BTF_TRACING_TYPE,
};
extern u32 btf_tracing_ids[];
#endif

4
kernel/bpf/bpf_task_storage.c
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@ -323,7 +323,7 @@ const struct bpf_func_proto bpf_task_storage_get_proto = {
.ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
.arg1_type = ARG_CONST_MAP_PTR,
.arg2_type = ARG_PTR_TO_BTF_ID,
.arg2_btf_id = &btf_task_struct_ids[0],
.arg2_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK],
.arg3_type = ARG_PTR_TO_MAP_VALUE_OR_NULL,
.arg4_type = ARG_ANYTHING,
};
@ -334,5 +334,5 @@ const struct bpf_func_proto bpf_task_storage_delete_proto = {
.ret_type = RET_INTEGER,
.arg1_type = ARG_CONST_MAP_PTR,
.arg2_type = ARG_PTR_TO_BTF_ID,
.arg2_btf_id = &btf_task_struct_ids[0],
.arg2_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK],
};

8
kernel/bpf/btf.c
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@ -6354,10 +6354,10 @@ const struct bpf_func_proto bpf_btf_find_by_name_kind_proto = {
.arg4_type = ARG_ANYTHING,
};
BTF_ID_LIST_GLOBAL(btf_task_struct_ids, 3)
BTF_ID(struct, task_struct)
BTF_ID(struct, file)
BTF_ID(struct, vm_area_struct)
BTF_ID_LIST_GLOBAL(btf_tracing_ids, MAX_BTF_TRACING_TYPE)
#define BTF_TRACING_TYPE(name, type) BTF_ID(struct, type)
BTF_TRACING_TYPE_xxx
#undef BTF_TRACING_TYPE
/* BTF ID set registration API for modules */

2
kernel/bpf/stackmap.c
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@ -489,7 +489,7 @@ const struct bpf_func_proto bpf_get_task_stack_proto = {
.gpl_only = false,
.ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_BTF_ID,
.arg1_btf_id = &btf_task_struct_ids[0],
.arg1_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK],
.arg2_type = ARG_PTR_TO_UNINIT_MEM,
.arg3_type = ARG_CONST_SIZE_OR_ZERO,
.arg4_type = ARG_ANYTHING,

12
kernel/bpf/task_iter.c
View File

@ -622,7 +622,7 @@ const struct bpf_func_proto bpf_find_vma_proto = {
.func = bpf_find_vma,
.ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_BTF_ID,
.arg1_btf_id = &btf_task_struct_ids[0],
.arg1_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK],
.arg2_type = ARG_ANYTHING,
.arg3_type = ARG_PTR_TO_FUNC,
.arg4_type = ARG_PTR_TO_STACK_OR_NULL,
@ -652,19 +652,19 @@ static int __init task_iter_init(void)
init_irq_work(&work->irq_work, do_mmap_read_unlock);
}
task_reg_info.ctx_arg_info[0].btf_id = btf_task_struct_ids[0];
task_reg_info.ctx_arg_info[0].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_TASK];
ret = bpf_iter_reg_target(&task_reg_info);
if (ret)
return ret;
task_file_reg_info.ctx_arg_info[0].btf_id = btf_task_struct_ids[0];
task_file_reg_info.ctx_arg_info[1].btf_id = btf_task_struct_ids[1];
task_file_reg_info.ctx_arg_info[0].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_TASK];
task_file_reg_info.ctx_arg_info[1].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_FILE];
ret = bpf_iter_reg_target(&task_file_reg_info);
if (ret)
return ret;
task_vma_reg_info.ctx_arg_info[0].btf_id = btf_task_struct_ids[0];
task_vma_reg_info.ctx_arg_info[1].btf_id = btf_task_struct_ids[2];
task_vma_reg_info.ctx_arg_info[0].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_TASK];
task_vma_reg_info.ctx_arg_info[1].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_VMA];
return bpf_iter_reg_target(&task_vma_reg_info);
}
late_initcall(task_iter_init);

2
kernel/bpf/verifier.c
View File

@ -6147,7 +6147,7 @@ static int set_find_vma_callback_state(struct bpf_verifier_env *env,
callee->regs[BPF_REG_2].type = PTR_TO_BTF_ID;
__mark_reg_known_zero(&callee->regs[BPF_REG_2]);
callee->regs[BPF_REG_2].btf = btf_vmlinux;
callee->regs[BPF_REG_2].btf_id = btf_task_struct_ids[2];
callee->regs[BPF_REG_2].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_VMA],
/* pointer to stack or null */
callee->regs[BPF_REG_3] = caller->regs[BPF_REG_4];

4
kernel/trace/bpf_trace.c
View File

@ -764,7 +764,7 @@ const struct bpf_func_proto bpf_get_current_task_btf_proto = {
.func = bpf_get_current_task_btf,
.gpl_only = true,
.ret_type = RET_PTR_TO_BTF_ID,
.ret_btf_id = &btf_task_struct_ids[0],
.ret_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK],
};
BPF_CALL_1(bpf_task_pt_regs, struct task_struct *, task)
@ -779,7 +779,7 @@ const struct bpf_func_proto bpf_task_pt_regs_proto = {
.func = bpf_task_pt_regs,
.gpl_only = true,
.arg1_type = ARG_PTR_TO_BTF_ID,
.arg1_btf_id = &btf_task_struct_ids[0],
.arg1_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK],
.ret_type = RET_PTR_TO_BTF_ID,
.ret_btf_id = &bpf_task_pt_regs_ids[0],
};