diff options
Diffstat (limited to 'drivers/hid/bpf/entrypoints')
-rw-r--r-- | drivers/hid/bpf/entrypoints/Makefile | 93 | ||||
-rw-r--r-- | drivers/hid/bpf/entrypoints/README | 4 | ||||
-rw-r--r-- | drivers/hid/bpf/entrypoints/entrypoints.bpf.c | 25 | ||||
-rw-r--r-- | drivers/hid/bpf/entrypoints/entrypoints.lskel.h | 248 |
4 files changed, 370 insertions, 0 deletions
diff --git a/drivers/hid/bpf/entrypoints/Makefile b/drivers/hid/bpf/entrypoints/Makefile new file mode 100644 index 0000000000..43b99b5575 --- /dev/null +++ b/drivers/hid/bpf/entrypoints/Makefile @@ -0,0 +1,93 @@ +# SPDX-License-Identifier: GPL-2.0 +OUTPUT := .output +abs_out := $(abspath $(OUTPUT)) + +CLANG ?= clang +LLC ?= llc +LLVM_STRIP ?= llvm-strip + +TOOLS_PATH := $(abspath ../../../../tools) +BPFTOOL_SRC := $(TOOLS_PATH)/bpf/bpftool +BPFTOOL_OUTPUT := $(abs_out)/bpftool +DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool +BPFTOOL ?= $(DEFAULT_BPFTOOL) + +LIBBPF_SRC := $(TOOLS_PATH)/lib/bpf +LIBBPF_OUTPUT := $(abs_out)/libbpf +LIBBPF_DESTDIR := $(LIBBPF_OUTPUT) +LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)/include +BPFOBJ := $(LIBBPF_OUTPUT)/libbpf.a + +INCLUDES := -I$(OUTPUT) -I$(LIBBPF_INCLUDE) -I$(TOOLS_PATH)/include/uapi +CFLAGS := -g -Wall + +VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \ + $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \ + ../../../../vmlinux \ + /sys/kernel/btf/vmlinux \ + /boot/vmlinux-$(shell uname -r) +VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS)))) +ifeq ($(VMLINUX_BTF),) +$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)") +endif + +ifeq ($(V),1) +Q = +msg = +else +Q = @ +msg = @printf ' %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))"; +MAKEFLAGS += --no-print-directory +submake_extras := feature_display=0 +endif + +.DELETE_ON_ERROR: + +.PHONY: all clean + +all: entrypoints.lskel.h + +clean: + $(call msg,CLEAN) + $(Q)rm -rf $(OUTPUT) entrypoints + +entrypoints.lskel.h: $(OUTPUT)/entrypoints.bpf.o | $(BPFTOOL) + $(call msg,GEN-SKEL,$@) + $(Q)$(BPFTOOL) gen skeleton -L $< > $@ + + +$(OUTPUT)/entrypoints.bpf.o: entrypoints.bpf.c $(OUTPUT)/vmlinux.h $(BPFOBJ) | $(OUTPUT) + $(call msg,BPF,$@) + $(Q)$(CLANG) -g -O2 --target=bpf $(INCLUDES) \ + -c $(filter %.c,$^) -o $@ && \ + $(LLVM_STRIP) -g $@ + +$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR) +ifeq ($(VMLINUX_H),) + $(call msg,GEN,,$@) + $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@ +else + $(call msg,CP,,$@) + $(Q)cp "$(VMLINUX_H)" $@ +endif + +$(OUTPUT) $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT): + $(call msg,MKDIR,$@) + $(Q)mkdir -p $@ + +$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT) + $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \ + OUTPUT=$(abspath $(dir $@))/ prefix= \ + DESTDIR=$(LIBBPF_DESTDIR) $(abspath $@) install_headers + +ifeq ($(CROSS_COMPILE),) +$(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT) + $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC) \ + OUTPUT=$(BPFTOOL_OUTPUT)/ \ + LIBBPF_BOOTSTRAP_OUTPUT=$(LIBBPF_OUTPUT)/ \ + LIBBPF_BOOTSTRAP_DESTDIR=$(LIBBPF_DESTDIR)/ bootstrap +else +$(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT) + $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC) \ + OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap +endif diff --git a/drivers/hid/bpf/entrypoints/README b/drivers/hid/bpf/entrypoints/README new file mode 100644 index 0000000000..147e0d4150 --- /dev/null +++ b/drivers/hid/bpf/entrypoints/README @@ -0,0 +1,4 @@ +WARNING: +If you change "entrypoints.bpf.c" do "make -j" in this directory to rebuild "entrypoints.skel.h". +Make sure to have clang 10 installed. +See Documentation/bpf/bpf_devel_QA.rst diff --git a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c new file mode 100644 index 0000000000..c22921125a --- /dev/null +++ b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2022 Benjamin Tissoires */ + +#include ".output/vmlinux.h" +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + +#define HID_BPF_MAX_PROGS 1024 + +struct { + __uint(type, BPF_MAP_TYPE_PROG_ARRAY); + __uint(max_entries, HID_BPF_MAX_PROGS); + __uint(key_size, sizeof(__u32)); + __uint(value_size, sizeof(__u32)); +} hid_jmp_table SEC(".maps"); + +SEC("fmod_ret/__hid_bpf_tail_call") +int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx) +{ + bpf_tail_call(ctx, &hid_jmp_table, hctx->index); + + return 0; +} + +char LICENSE[] SEC("license") = "GPL"; diff --git a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h new file mode 100644 index 0000000000..3561805159 --- /dev/null +++ b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h @@ -0,0 +1,248 @@ +/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ +/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */ +#ifndef __ENTRYPOINTS_BPF_SKEL_H__ +#define __ENTRYPOINTS_BPF_SKEL_H__ + +#include <bpf/skel_internal.h> + +struct entrypoints_bpf { + struct bpf_loader_ctx ctx; + struct { + struct bpf_map_desc hid_jmp_table; + } maps; + struct { + struct bpf_prog_desc hid_tail_call; + } progs; + struct { + int hid_tail_call_fd; + } links; +}; + +static inline int +entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel) +{ + int prog_fd = skel->progs.hid_tail_call.prog_fd; + int fd = skel_raw_tracepoint_open(NULL, prog_fd); + + if (fd > 0) + skel->links.hid_tail_call_fd = fd; + return fd; +} + +static inline int +entrypoints_bpf__attach(struct entrypoints_bpf *skel) +{ + int ret = 0; + + ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call__attach(skel); + return ret < 0 ? ret : 0; +} + +static inline void +entrypoints_bpf__detach(struct entrypoints_bpf *skel) +{ + skel_closenz(skel->links.hid_tail_call_fd); +} +static void +entrypoints_bpf__destroy(struct entrypoints_bpf *skel) +{ + if (!skel) + return; + entrypoints_bpf__detach(skel); + skel_closenz(skel->progs.hid_tail_call.prog_fd); + skel_closenz(skel->maps.hid_jmp_table.map_fd); + skel_free(skel); +} +static inline struct entrypoints_bpf * +entrypoints_bpf__open(void) +{ + struct entrypoints_bpf *skel; + + skel = skel_alloc(sizeof(*skel)); + if (!skel) + goto cleanup; + skel->ctx.sz = (void *)&skel->links - (void *)skel; + return skel; +cleanup: + entrypoints_bpf__destroy(skel); + return NULL; +} + +static inline int +entrypoints_bpf__load(struct entrypoints_bpf *skel) +{ + struct bpf_load_and_run_opts opts = {}; + int err; + + opts.ctx = (struct bpf_loader_ctx *)skel; + opts.data_sz = 2856; + opts.data = (void *)"\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ 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+\0\0\x63\x7a\x80\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\ +\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\x63\x06\x28\0\0\0\ +\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\0\ +\0\0\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0"; + err = bpf_load_and_run(&opts); + if (err < 0) + return err; + return 0; +} + +static inline struct entrypoints_bpf * +entrypoints_bpf__open_and_load(void) +{ + struct entrypoints_bpf *skel; + + skel = entrypoints_bpf__open(); + if (!skel) + return NULL; + if (entrypoints_bpf__load(skel)) { + entrypoints_bpf__destroy(skel); + return NULL; + } + return skel; +} + +__attribute__((unused)) static void +entrypoints_bpf__assert(struct entrypoints_bpf *s __attribute__((unused))) +{ +#ifdef __cplusplus +#define _Static_assert static_assert +#endif +#ifdef __cplusplus +#undef _Static_assert +#endif +} + +#endif /* __ENTRYPOINTS_BPF_SKEL_H__ */ |