Commit 4a86220e authored by Benjamin Tissoires's avatar Benjamin Tissoires
Browse files

HID: bpf: remove tracing HID-BPF capability 

We can now rely on struct_ops as we cleared the users in-tree.

Link: https://lore.kernel.org/r/20240608-hid_bpf_struct_ops-v3-8-6ac6ade58329@kernel.org


Signed-off-by: default avatarBenjamin Tissoires <bentiss@kernel.org>
parent 50fe0fc6

drivers/hid/bpf/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -8,4 +8,4 @@ LIBBPF_INCLUDE = $(srctree)/tools/lib 
obj-$(CONFIG_HID_BPF) += hid_bpf.o

CFLAGS_hid_bpf_dispatch.o += -I$(LIBBPF_INCLUDE)

CFLAGS_hid_bpf_jmp_table.o += -I$(LIBBPF_INCLUDE)

hid_bpf-objs += hid_bpf_dispatch.o hid_bpf_jmp_table.o hid_bpf_struct_ops.o
 
hid_bpf-objs += hid_bpf_dispatch.o hid_bpf_struct_ops.o

drivers/hid/bpf/entrypoints/Makefile

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+0 −93
Original line number Diff line number Diff line 
# 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

drivers/hid/bpf/entrypoints/README

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+0 −4
Original line number Diff line number Diff line 
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

drivers/hid/bpf/entrypoints/entrypoints.bpf.c

deleted100644 → 0
+0 −25
Original line number Diff line number Diff line 
// 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";

drivers/hid/bpf/entrypoints/entrypoints.lskel.h

deleted100644 → 0
+0 −248
Original line number Diff line number Diff line 
/* 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 *)"\

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\x74\0\x68\x69\x64\x5f\x72\x65\x70\x6f\x72\x74\x5f\x74\x79\x70\x65\0\x48\x49\

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\x55\x54\x50\x55\x54\x5f\x52\x45\x50\x4f\x52\x54\0\x48\x49\x44\x5f\x46\x45\x41\

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\x52\x54\x5f\x54\x59\x50\x45\x53\0\x72\x65\x74\x76\x61\x6c\0\x73\x69\x7a\x65\0\

\x5f\x5f\x73\x33\x32\0\x30\x3a\x30\0\x09\x62\x70\x66\x5f\x74\x61\x69\x6c\x5f\

\x63\x61\x6c\x6c\x28\x63\x74\x78\x2c\x20\x26\x68\x69\x64\x5f\x6a\x6d\x70\x5f\

\x74\x61\x62\x6c\x65\x2c\x20\x68\x63\x74\x78\x2d\x3e\x69\x6e\x64\x65\x78\x29\

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\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x8a\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x03\

\0\0\0\x04\0\0\0\x04\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x68\x69\x64\x5f\

\x6a\x6d\x70\x5f\x74\x61\x62\x6c\x65\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\

\0\0\0\0\0\0\0\0\0\0\x47\x50\x4c\0\0\0\0\0\x79\x12\0\0\0\0\0\0\x61\x23\0\0\0\0\

\0\0\x18\x52\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x85\0\0\0\x0c\0\0\0\xb7\0\0\0\0\0\0\0\

\x95\0\0\0\0\0\0\0\0\0\0\0\x0e\0\0\0\0\0\0\0\x8e\0\0\0\xd3\0\0\0\x05\x48\0\0\

\x01\0\0\0\x8e\0\0\0\xba\x01\0\0\x02\x50\0\0\x05\0\0\0\x8e\0\0\0\xd3\0\0\0\x05\

\x48\0\0\x08\0\0\0\x0f\0\0\0\xb6\x01\0\0\0\0\0\0\x1a\0\0\0\x07\0\0\0\0\0\0\0\0\

\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x68\x69\

\x64\x5f\x74\x61\x69\x6c\x5f\x63\x61\x6c\x6c\0\0\0\0\0\0\0\x1a\0\0\0\0\0\0\0\

\x08\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\x10\0\0\0\0\0\0\0\0\0\0\0\x03\0\0\0\x01\0\

\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x5f\

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\0\0";

	opts.insns_sz = 1192;

	opts.insns = (void *)"\

\xbf\x16\0\0\0\0\0\0\xbf\xa1\0\0\0\0\0\0\x07\x01\0\0\x78\xff\xff\xff\xb7\x02\0\

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\0\0\0\0\0\0\0\0\x80\x0a\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\

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\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__ */