hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/ICA1GK -------------------------------- This kfunc is to acquire the memory & swap-related parts of sysinfo. Signed-off-by: GONG Ruiqi <gongruiqi1@huawei.com> --- kernel/bpf-rvi/Makefile | 2 +- kernel/bpf-rvi/common_kfuncs.c | 54 ++++++++++++++++++++++++++++++++++ 2 files changed, 55 insertions(+), 1 deletion(-) create mode 100644 kernel/bpf-rvi/common_kfuncs.c diff --git a/kernel/bpf-rvi/Makefile b/kernel/bpf-rvi/Makefile index 8c226d5f1b3e..9c846eefda4d 100644 --- a/kernel/bpf-rvi/Makefile +++ b/kernel/bpf-rvi/Makefile @@ -1,4 +1,4 @@ # SPDX-License-Identifier: GPL-2.0 # Copyright (c) 2025 Huawei Technologies Co., Ltd -obj-y := generic_single_iter.o +obj-y := generic_single_iter.o common_kfuncs.o diff --git a/kernel/bpf-rvi/common_kfuncs.c b/kernel/bpf-rvi/common_kfuncs.c new file mode 100644 index 000000000000..53b7ca1acc39 --- /dev/null +++ b/kernel/bpf-rvi/common_kfuncs.c @@ -0,0 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2025 Huawei Technologies Co., Ltd */ + +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/types.h> +#include <linux/btf_ids.h> +#include <linux/bpf.h> + +/* + * no padding member "_f" compared to struct sysinfo, because sizeof(_f) + * maybe zero and not supported by bpf_verifier. + */ +struct bpf_sysinfo { + __kernel_long_t uptime; /* Seconds since boot */ + __kernel_ulong_t loads[3]; /* 1, 5, and 15 minute load averages */ + __kernel_ulong_t totalram; /* Total usable main memory size */ + __kernel_ulong_t freeram; /* Available memory size */ + __kernel_ulong_t sharedram; /* Amount of shared memory */ + __kernel_ulong_t bufferram; /* Memory used by buffers */ + __kernel_ulong_t totalswap; /* Total swap space size */ + __kernel_ulong_t freeswap; /* swap space still available */ + __u16 procs; /* Number of current processes */ + __u16 pad; /* Explicit padding for m68k */ + __kernel_ulong_t totalhigh; /* Total high memory size */ + __kernel_ulong_t freehigh; /* Available high memory size */ + __u32 mem_unit; /* Memory unit size in bytes */ +}; + +__bpf_kfunc void bpf_si_memswinfo(struct bpf_sysinfo *bsi) +{ + struct sysinfo *si = (struct sysinfo *)bsi; + + if (si) { + si_meminfo(si); + si_swapinfo(si); + } +} + +BTF_SET8_START(bpf_common_kfuncs_ids) +BTF_ID_FLAGS(func, bpf_si_memswinfo) +BTF_SET8_END(bpf_common_kfuncs_ids) + +static const struct btf_kfunc_id_set bpf_common_kfuncs_set = { + .owner = THIS_MODULE, + .set = &bpf_common_kfuncs_ids, +}; + +static int __init bpf_common_kfuncs_init(void) +{ + return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, + &bpf_common_kfuncs_set); +} +late_initcall(bpf_common_kfuncs_init); -- 2.25.1