mirror of
https://github.com/torvalds/linux.git
synced 2026-04-25 10:02:31 -04:00
6e663ffdf7
Implement bpf_task_work_schedule_* with an implicit bpf_prog_aux argument, and remove corresponding _impl funcs from the kernel. Update special kfunc checks in the verifier accordingly. Update the selftests to use the new API with implicit argument. Reviewed-by: Eduard Zingerman <eddyz87@gmail.com> Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev> Link: https://lore.kernel.org/r/20260120222638.3976562-10-ihor.solodrai@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>
107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
|
|
|
|
#include <vmlinux.h>
|
|
#include <string.h>
|
|
#include <stdbool.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
#include "bpf_misc.h"
|
|
#include "errno.h"
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
|
|
const void *user_ptr = NULL;
|
|
|
|
struct elem {
|
|
char data[128];
|
|
struct bpf_task_work tw;
|
|
};
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_HASH);
|
|
__uint(map_flags, BPF_F_NO_PREALLOC);
|
|
__uint(max_entries, 1);
|
|
__type(key, int);
|
|
__type(value, struct elem);
|
|
} hmap SEC(".maps");
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_ARRAY);
|
|
__uint(max_entries, 1);
|
|
__type(key, int);
|
|
__type(value, struct elem);
|
|
} arrmap SEC(".maps");
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_LRU_HASH);
|
|
__uint(max_entries, 1);
|
|
__type(key, int);
|
|
__type(value, struct elem);
|
|
} lrumap SEC(".maps");
|
|
|
|
static int process_work(struct bpf_map *map, void *key, void *value)
|
|
{
|
|
struct elem *work = value;
|
|
|
|
bpf_copy_from_user_str(work->data, sizeof(work->data), (const void *)user_ptr, 0);
|
|
return 0;
|
|
}
|
|
|
|
int key = 0;
|
|
|
|
SEC("perf_event")
|
|
int oncpu_hash_map(struct pt_regs *args)
|
|
{
|
|
struct elem empty_work = { .data = { 0 } };
|
|
struct elem *work;
|
|
struct task_struct *task;
|
|
int err;
|
|
|
|
task = bpf_get_current_task_btf();
|
|
err = bpf_map_update_elem(&hmap, &key, &empty_work, BPF_NOEXIST);
|
|
if (err)
|
|
return 0;
|
|
work = bpf_map_lookup_elem(&hmap, &key);
|
|
if (!work)
|
|
return 0;
|
|
bpf_task_work_schedule_resume(task, &work->tw, &hmap, process_work);
|
|
return 0;
|
|
}
|
|
|
|
SEC("perf_event")
|
|
int oncpu_array_map(struct pt_regs *args)
|
|
{
|
|
struct elem *work;
|
|
struct task_struct *task;
|
|
|
|
task = bpf_get_current_task_btf();
|
|
work = bpf_map_lookup_elem(&arrmap, &key);
|
|
if (!work)
|
|
return 0;
|
|
bpf_task_work_schedule_signal(task, &work->tw, &arrmap, process_work);
|
|
return 0;
|
|
}
|
|
|
|
SEC("perf_event")
|
|
int oncpu_lru_map(struct pt_regs *args)
|
|
{
|
|
struct elem empty_work = { .data = { 0 } };
|
|
struct elem *work;
|
|
struct task_struct *task;
|
|
int err;
|
|
|
|
task = bpf_get_current_task_btf();
|
|
work = bpf_map_lookup_elem(&lrumap, &key);
|
|
if (work)
|
|
return 0;
|
|
err = bpf_map_update_elem(&lrumap, &key, &empty_work, BPF_NOEXIST);
|
|
if (err)
|
|
return 0;
|
|
work = bpf_map_lookup_elem(&lrumap, &key);
|
|
if (!work || work->data[0])
|
|
return 0;
|
|
bpf_task_work_schedule_resume(task, &work->tw, &lrumap, process_work);
|
|
return 0;
|
|
}
|