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Merge branch 'for-6.3/hid-bpf' into for-linus
Initial support of HID-BPF (Benjamin Tissoires) The history is a little long for this series, as it was intended to be sent for v6.2. However some last minute issues forced us to postpone it to v6.3. Conflicts: * drivers/hid/i2c-hid/Kconfig: commitbf7660dab3("HID: stop drivers from selecting CONFIG_HID") conflicts with commit2afac81dd1("HID: fix I2C_HID not selected when I2C_HID_OF_ELAN is") the resolution is simple enough: just drop the "default" and "select" lines as the new commit from Arnd is doing
This commit is contained in:
Benjamin Tissoires
8
samples/hid/.gitignore
vendored
Normal file
8
samples/hid/.gitignore
vendored
Normal file
@@ -0,0 +1,8 @@
|
||||
# SPDX-License-Identifier: GPL-2.0-only
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hid_mouse
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hid_surface_dial
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*.out
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*.skel.h
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/vmlinux.h
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/bpftool/
|
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/libbpf/
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250
samples/hid/Makefile
Normal file
250
samples/hid/Makefile
Normal file
@@ -0,0 +1,250 @@
|
||||
# SPDX-License-Identifier: GPL-2.0
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|
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HID_SAMPLES_PATH ?= $(abspath $(srctree)/$(src))
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TOOLS_PATH := $(HID_SAMPLES_PATH)/../../tools
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pound := \#
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|
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# List of programs to build
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tprogs-y += hid_mouse
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tprogs-y += hid_surface_dial
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|
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# Libbpf dependencies
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LIBBPF_SRC = $(TOOLS_PATH)/lib/bpf
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LIBBPF_OUTPUT = $(abspath $(HID_SAMPLES_PATH))/libbpf
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LIBBPF_DESTDIR = $(LIBBPF_OUTPUT)
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LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include
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LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a
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EXTRA_HEADERS := hid_bpf_attach.h
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EXTRA_BPF_HEADERS := hid_bpf_helpers.h
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hid_mouse-objs := hid_mouse.o
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hid_surface_dial-objs := hid_surface_dial.o
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# Tell kbuild to always build the programs
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always-y := $(tprogs-y)
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ifeq ($(ARCH), arm)
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# Strip all except -D__LINUX_ARM_ARCH__ option needed to handle linux
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# headers when arm instruction set identification is requested.
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ARM_ARCH_SELECTOR := $(filter -D__LINUX_ARM_ARCH__%, $(KBUILD_CFLAGS))
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BPF_EXTRA_CFLAGS := $(ARM_ARCH_SELECTOR)
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TPROGS_CFLAGS += $(ARM_ARCH_SELECTOR)
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endif
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ifeq ($(ARCH), mips)
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TPROGS_CFLAGS += -D__SANE_USERSPACE_TYPES__
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ifdef CONFIG_MACH_LOONGSON64
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BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-loongson64
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BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-generic
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endif
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endif
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|
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TPROGS_CFLAGS += -Wall -O2
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TPROGS_CFLAGS += -Wmissing-prototypes
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TPROGS_CFLAGS += -Wstrict-prototypes
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|
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TPROGS_CFLAGS += -I$(objtree)/usr/include
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TPROGS_CFLAGS += -I$(LIBBPF_INCLUDE)
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TPROGS_CFLAGS += -I$(srctree)/tools/include
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|
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ifdef SYSROOT
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TPROGS_CFLAGS += --sysroot=$(SYSROOT)
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TPROGS_LDFLAGS := -L$(SYSROOT)/usr/lib
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endif
|
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|
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TPROGS_LDLIBS += $(LIBBPF) -lelf -lz
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|
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# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
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# make M=samples/bpf LLC=~/git/llvm-project/llvm/build/bin/llc CLANG=~/git/llvm-project/llvm/build/bin/clang
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LLC ?= llc
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CLANG ?= clang
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OPT ?= opt
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LLVM_DIS ?= llvm-dis
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LLVM_OBJCOPY ?= llvm-objcopy
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LLVM_READELF ?= llvm-readelf
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BTF_PAHOLE ?= pahole
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|
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# Detect that we're cross compiling and use the cross compiler
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ifdef CROSS_COMPILE
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CLANG_ARCH_ARGS = --target=$(notdir $(CROSS_COMPILE:%-=%))
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endif
|
||||
|
||||
# Don't evaluate probes and warnings if we need to run make recursively
|
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ifneq ($(src),)
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HDR_PROBE := $(shell printf "$(pound)include <linux/types.h>\n struct list_head { int a; }; int main() { return 0; }" | \
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$(CC) $(TPROGS_CFLAGS) $(TPROGS_LDFLAGS) -x c - \
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-o /dev/null 2>/dev/null && echo okay)
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|
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ifeq ($(HDR_PROBE),)
|
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$(warning WARNING: Detected possible issues with include path.)
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$(warning WARNING: Please install kernel headers locally (make headers_install).)
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endif
|
||||
|
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BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)
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BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)
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BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')
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BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \
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$(CLANG) -target bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \
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$(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \
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/bin/rm -f ./llvm_btf_verify.o)
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|
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BPF_EXTRA_CFLAGS += -fno-stack-protector
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ifneq ($(BTF_LLVM_PROBE),)
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BPF_EXTRA_CFLAGS += -g
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else
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ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),)
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BPF_EXTRA_CFLAGS += -g
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LLC_FLAGS += -mattr=dwarfris
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DWARF2BTF = y
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endif
|
||||
endif
|
||||
endif
|
||||
|
||||
# Trick to allow make to be run from this directory
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all:
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$(MAKE) -C ../../ M=$(CURDIR) HID_SAMPLES_PATH=$(CURDIR)
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|
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clean:
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$(MAKE) -C ../../ M=$(CURDIR) clean
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@find $(CURDIR) -type f -name '*~' -delete
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@$(RM) -r $(CURDIR)/libbpf $(CURDIR)/bpftool
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|
||||
$(LIBBPF): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)
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# Fix up variables inherited from Kbuild that tools/ build system won't like
|
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$(MAKE) -C $(LIBBPF_SRC) RM='rm -rf' EXTRA_CFLAGS="$(TPROGS_CFLAGS)" \
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LDFLAGS=$(TPROGS_LDFLAGS) srctree=$(HID_SAMPLES_PATH)/../../ \
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O= OUTPUT=$(LIBBPF_OUTPUT)/ DESTDIR=$(LIBBPF_DESTDIR) prefix= \
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$@ install_headers
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|
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BPFTOOLDIR := $(TOOLS_PATH)/bpf/bpftool
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BPFTOOL_OUTPUT := $(abspath $(HID_SAMPLES_PATH))/bpftool
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BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool
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$(BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) | $(BPFTOOL_OUTPUT)
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$(MAKE) -C $(BPFTOOLDIR) srctree=$(HID_SAMPLES_PATH)/../../ \
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OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap
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||||
|
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$(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):
|
||||
$(call msg,MKDIR,$@)
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$(Q)mkdir -p $@
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|
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FORCE:
|
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|
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|
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# Verify LLVM compiler tools are available and bpf target is supported by llc
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.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)
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|
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verify_cmds: $(CLANG) $(LLC)
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@for TOOL in $^ ; do \
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if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \
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echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\
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exit 1; \
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else true; fi; \
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done
|
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|
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verify_target_bpf: verify_cmds
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@if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \
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echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\
|
||||
echo " NOTICE: LLVM version >= 3.7.1 required" ;\
|
||||
exit 2; \
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||||
else true; fi
|
||||
|
||||
$(HID_SAMPLES_PATH)/*.c: verify_target_bpf $(LIBBPF)
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||||
$(src)/*.c: verify_target_bpf $(LIBBPF)
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||||
|
||||
libbpf_hdrs: $(LIBBPF)
|
||||
|
||||
.PHONY: libbpf_hdrs
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||||
|
||||
$(obj)/hid_mouse.o: $(obj)/hid_mouse.skel.h
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$(obj)/hid_surface_dial.o: $(obj)/hid_surface_dial.skel.h
|
||||
|
||||
-include $(HID_SAMPLES_PATH)/Makefile.target
|
||||
|
||||
VMLINUX_BTF_PATHS ?= $(abspath $(if $(O),$(O)/vmlinux)) \
|
||||
$(abspath $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)) \
|
||||
$(abspath ./vmlinux)
|
||||
VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
|
||||
|
||||
$(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL)
|
||||
ifeq ($(VMLINUX_H),)
|
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ifeq ($(VMLINUX_BTF),)
|
||||
$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)",\
|
||||
build the kernel or set VMLINUX_BTF or VMLINUX_H variable)
|
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endif
|
||||
$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
|
||||
else
|
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$(Q)cp "$(VMLINUX_H)" $@
|
||||
endif
|
||||
|
||||
clean-files += vmlinux.h
|
||||
|
||||
# Get Clang's default includes on this system, as opposed to those seen by
|
||||
# '-target bpf'. This fixes "missing" files on some architectures/distros,
|
||||
# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
|
||||
#
|
||||
# Use '-idirafter': Don't interfere with include mechanics except where the
|
||||
# build would have failed anyways.
|
||||
define get_sys_includes
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$(shell $(1) -v -E - </dev/null 2>&1 \
|
||||
| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
|
||||
$(shell $(1) -dM -E - </dev/null | grep '#define __riscv_xlen ' | sed 's/#define /-D/' | sed 's/ /=/')
|
||||
endef
|
||||
|
||||
CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
|
||||
|
||||
EXTRA_BPF_HEADERS_SRC := $(addprefix $(src)/,$(EXTRA_BPF_HEADERS))
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||||
|
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$(obj)/%.bpf.o: $(src)/%.bpf.c $(EXTRA_BPF_HEADERS_SRC) $(obj)/vmlinux.h
|
||||
@echo " CLANG-BPF " $@
|
||||
$(Q)$(CLANG) -g -O2 -target bpf -D__TARGET_ARCH_$(SRCARCH) \
|
||||
-Wno-compare-distinct-pointer-types -I$(srctree)/include \
|
||||
-I$(srctree)/samples/bpf -I$(srctree)/tools/include \
|
||||
-I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \
|
||||
-c $(filter %.bpf.c,$^) -o $@
|
||||
|
||||
LINKED_SKELS := hid_mouse.skel.h hid_surface_dial.skel.h
|
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clean-files += $(LINKED_SKELS)
|
||||
|
||||
hid_mouse.skel.h-deps := hid_mouse.bpf.o hid_bpf_attach.bpf.o
|
||||
hid_surface_dial.skel.h-deps := hid_surface_dial.bpf.o hid_bpf_attach.bpf.o
|
||||
|
||||
LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
|
||||
|
||||
BPF_SRCS_LINKED := $(notdir $(wildcard $(src)/*.bpf.c))
|
||||
BPF_OBJS_LINKED := $(patsubst %.bpf.c,$(obj)/%.bpf.o, $(BPF_SRCS_LINKED))
|
||||
BPF_SKELS_LINKED := $(addprefix $(obj)/,$(LINKED_SKELS))
|
||||
|
||||
$(BPF_SKELS_LINKED): $(BPF_OBJS_LINKED) $(BPFTOOL)
|
||||
@echo " BPF GEN-OBJ " $(@:.skel.h=)
|
||||
$(Q)$(BPFTOOL) gen object $(@:.skel.h=.lbpf.o) $(addprefix $(obj)/,$($(@F)-deps))
|
||||
@echo " BPF GEN-SKEL" $(@:.skel.h=)
|
||||
$(Q)$(BPFTOOL) gen skeleton $(@:.skel.h=.lbpf.o) name $(notdir $(@:.skel.h=)) > $@
|
||||
|
||||
# asm/sysreg.h - inline assembly used by it is incompatible with llvm.
|
||||
# But, there is no easy way to fix it, so just exclude it since it is
|
||||
# useless for BPF samples.
|
||||
# below we use long chain of commands, clang | opt | llvm-dis | llc,
|
||||
# to generate final object file. 'clang' compiles the source into IR
|
||||
# with native target, e.g., x64, arm64, etc. 'opt' does bpf CORE IR builtin
|
||||
# processing (llvm12) and IR optimizations. 'llvm-dis' converts
|
||||
# 'opt' output to IR, and finally 'llc' generates bpf byte code.
|
||||
$(obj)/%.o: $(src)/%.c
|
||||
@echo " CLANG-bpf " $@
|
||||
$(Q)$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(BPF_EXTRA_CFLAGS) \
|
||||
-I$(obj) -I$(srctree)/tools/testing/selftests/bpf/ \
|
||||
-I$(LIBBPF_INCLUDE) \
|
||||
-D__KERNEL__ -D__BPF_TRACING__ -Wno-unused-value -Wno-pointer-sign \
|
||||
-D__TARGET_ARCH_$(SRCARCH) -Wno-compare-distinct-pointer-types \
|
||||
-Wno-gnu-variable-sized-type-not-at-end \
|
||||
-Wno-address-of-packed-member -Wno-tautological-compare \
|
||||
-Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \
|
||||
-fno-asynchronous-unwind-tables \
|
||||
-I$(srctree)/samples/hid/ \
|
||||
-O2 -emit-llvm -Xclang -disable-llvm-passes -c $< -o - | \
|
||||
$(OPT) -O2 -mtriple=bpf-pc-linux | $(LLVM_DIS) | \
|
||||
$(LLC) -march=bpf $(LLC_FLAGS) -filetype=obj -o $@
|
||||
ifeq ($(DWARF2BTF),y)
|
||||
$(BTF_PAHOLE) -J $@
|
||||
endif
|
||||
75
samples/hid/Makefile.target
Normal file
75
samples/hid/Makefile.target
Normal file
@@ -0,0 +1,75 @@
|
||||
# SPDX-License-Identifier: GPL-2.0
|
||||
# ==========================================================================
|
||||
# Building binaries on the host system
|
||||
# Binaries are not used during the compilation of the kernel, and intended
|
||||
# to be build for target board, target board can be host of course. Added to
|
||||
# build binaries to run not on host system.
|
||||
#
|
||||
# Sample syntax
|
||||
# tprogs-y := xsk_example
|
||||
# Will compile xsk_example.c and create an executable named xsk_example
|
||||
#
|
||||
# tprogs-y := xdpsock
|
||||
# xdpsock-objs := xdpsock_1.o xdpsock_2.o
|
||||
# Will compile xdpsock_1.c and xdpsock_2.c, and then link the executable
|
||||
# xdpsock, based on xdpsock_1.o and xdpsock_2.o
|
||||
#
|
||||
# Derived from scripts/Makefile.host
|
||||
#
|
||||
__tprogs := $(sort $(tprogs-y))
|
||||
|
||||
# C code
|
||||
# Executables compiled from a single .c file
|
||||
tprog-csingle := $(foreach m,$(__tprogs), \
|
||||
$(if $($(m)-objs),,$(m)))
|
||||
|
||||
# C executables linked based on several .o files
|
||||
tprog-cmulti := $(foreach m,$(__tprogs),\
|
||||
$(if $($(m)-objs),$(m)))
|
||||
|
||||
# Object (.o) files compiled from .c files
|
||||
tprog-cobjs := $(sort $(foreach m,$(__tprogs),$($(m)-objs)))
|
||||
|
||||
tprog-csingle := $(addprefix $(obj)/,$(tprog-csingle))
|
||||
tprog-cmulti := $(addprefix $(obj)/,$(tprog-cmulti))
|
||||
tprog-cobjs := $(addprefix $(obj)/,$(tprog-cobjs))
|
||||
|
||||
#####
|
||||
# Handle options to gcc. Support building with separate output directory
|
||||
|
||||
_tprogc_flags = $(TPROGS_CFLAGS) \
|
||||
$(TPROGCFLAGS_$(basetarget).o)
|
||||
|
||||
# $(objtree)/$(obj) for including generated headers from checkin source files
|
||||
ifeq ($(KBUILD_EXTMOD),)
|
||||
ifdef building_out_of_srctree
|
||||
_tprogc_flags += -I $(objtree)/$(obj)
|
||||
endif
|
||||
endif
|
||||
|
||||
tprogc_flags = -Wp,-MD,$(depfile) $(_tprogc_flags)
|
||||
|
||||
# Create executable from a single .c file
|
||||
# tprog-csingle -> Executable
|
||||
quiet_cmd_tprog-csingle = CC $@
|
||||
cmd_tprog-csingle = $(CC) $(tprogc_flags) $(TPROGS_LDFLAGS) -o $@ $< \
|
||||
$(TPROGS_LDLIBS) $(TPROGLDLIBS_$(@F))
|
||||
$(tprog-csingle): $(obj)/%: $(src)/%.c FORCE
|
||||
$(call if_changed_dep,tprog-csingle)
|
||||
|
||||
# Link an executable based on list of .o files, all plain c
|
||||
# tprog-cmulti -> executable
|
||||
quiet_cmd_tprog-cmulti = LD $@
|
||||
cmd_tprog-cmulti = $(CC) $(tprogc_flags) $(TPROGS_LDFLAGS) -o $@ \
|
||||
$(addprefix $(obj)/,$($(@F)-objs)) \
|
||||
$(TPROGS_LDLIBS) $(TPROGLDLIBS_$(@F))
|
||||
$(tprog-cmulti): $(tprog-cobjs) FORCE
|
||||
$(call if_changed,tprog-cmulti)
|
||||
$(call multi_depend, $(tprog-cmulti), , -objs)
|
||||
|
||||
# Create .o file from a single .c file
|
||||
# tprog-cobjs -> .o
|
||||
quiet_cmd_tprog-cobjs = CC $@
|
||||
cmd_tprog-cobjs = $(CC) $(tprogc_flags) -c -o $@ $<
|
||||
$(tprog-cobjs): $(obj)/%.o: $(src)/%.c FORCE
|
||||
$(call if_changed_dep,tprog-cobjs)
|
||||
18
samples/hid/hid_bpf_attach.bpf.c
Normal file
18
samples/hid/hid_bpf_attach.bpf.c
Normal file
@@ -0,0 +1,18 @@
|
||||
// SPDX-License-Identifier: GPL-2.0-only
|
||||
/* Copyright (c) 2022 Benjamin Tissoires
|
||||
*/
|
||||
|
||||
#include "vmlinux.h"
|
||||
#include <bpf/bpf_helpers.h>
|
||||
#include <bpf/bpf_tracing.h>
|
||||
#include "hid_bpf_attach.h"
|
||||
#include "hid_bpf_helpers.h"
|
||||
|
||||
SEC("syscall")
|
||||
int attach_prog(struct attach_prog_args *ctx)
|
||||
{
|
||||
ctx->retval = hid_bpf_attach_prog(ctx->hid,
|
||||
ctx->prog_fd,
|
||||
0);
|
||||
return 0;
|
||||
}
|
||||
14
samples/hid/hid_bpf_attach.h
Normal file
14
samples/hid/hid_bpf_attach.h
Normal file
@@ -0,0 +1,14 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0-only */
|
||||
/* Copyright (c) 2022 Benjamin Tissoires
|
||||
*/
|
||||
|
||||
#ifndef __HID_BPF_ATTACH_H
|
||||
#define __HID_BPF_ATTACH_H
|
||||
|
||||
struct attach_prog_args {
|
||||
int prog_fd;
|
||||
unsigned int hid;
|
||||
int retval;
|
||||
};
|
||||
|
||||
#endif /* __HID_BPF_ATTACH_H */
|
||||
21
samples/hid/hid_bpf_helpers.h
Normal file
21
samples/hid/hid_bpf_helpers.h
Normal file
@@ -0,0 +1,21 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0-only */
|
||||
/* Copyright (c) 2022 Benjamin Tissoires
|
||||
*/
|
||||
|
||||
#ifndef __HID_BPF_HELPERS_H
|
||||
#define __HID_BPF_HELPERS_H
|
||||
|
||||
/* following are kfuncs exported by HID for HID-BPF */
|
||||
extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx,
|
||||
unsigned int offset,
|
||||
const size_t __sz) __ksym;
|
||||
extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym;
|
||||
extern struct hid_bpf_ctx *hid_bpf_allocate_context(unsigned int hid_id) __ksym;
|
||||
extern void hid_bpf_release_context(struct hid_bpf_ctx *ctx) __ksym;
|
||||
extern int hid_bpf_hw_request(struct hid_bpf_ctx *ctx,
|
||||
__u8 *data,
|
||||
size_t buf__sz,
|
||||
enum hid_report_type type,
|
||||
enum hid_class_request reqtype) __ksym;
|
||||
|
||||
#endif /* __HID_BPF_HELPERS_H */
|
||||
112
samples/hid/hid_mouse.bpf.c
Normal file
112
samples/hid/hid_mouse.bpf.c
Normal file
@@ -0,0 +1,112 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
|
||||
#include "vmlinux.h"
|
||||
#include <bpf/bpf_helpers.h>
|
||||
#include <bpf/bpf_tracing.h>
|
||||
#include "hid_bpf_helpers.h"
|
||||
|
||||
SEC("fmod_ret/hid_bpf_device_event")
|
||||
int BPF_PROG(hid_y_event, struct hid_bpf_ctx *hctx)
|
||||
{
|
||||
s16 y;
|
||||
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
|
||||
|
||||
if (!data)
|
||||
return 0; /* EPERM check */
|
||||
|
||||
bpf_printk("event: size: %d", hctx->size);
|
||||
bpf_printk("incoming event: %02x %02x %02x",
|
||||
data[0],
|
||||
data[1],
|
||||
data[2]);
|
||||
bpf_printk(" %02x %02x %02x",
|
||||
data[3],
|
||||
data[4],
|
||||
data[5]);
|
||||
bpf_printk(" %02x %02x %02x",
|
||||
data[6],
|
||||
data[7],
|
||||
data[8]);
|
||||
|
||||
y = data[3] | (data[4] << 8);
|
||||
|
||||
y = -y;
|
||||
|
||||
data[3] = y & 0xFF;
|
||||
data[4] = (y >> 8) & 0xFF;
|
||||
|
||||
bpf_printk("modified event: %02x %02x %02x",
|
||||
data[0],
|
||||
data[1],
|
||||
data[2]);
|
||||
bpf_printk(" %02x %02x %02x",
|
||||
data[3],
|
||||
data[4],
|
||||
data[5]);
|
||||
bpf_printk(" %02x %02x %02x",
|
||||
data[6],
|
||||
data[7],
|
||||
data[8]);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
SEC("fmod_ret/hid_bpf_device_event")
|
||||
int BPF_PROG(hid_x_event, struct hid_bpf_ctx *hctx)
|
||||
{
|
||||
s16 x;
|
||||
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
|
||||
|
||||
if (!data)
|
||||
return 0; /* EPERM check */
|
||||
|
||||
x = data[1] | (data[2] << 8);
|
||||
|
||||
x = -x;
|
||||
|
||||
data[1] = x & 0xFF;
|
||||
data[2] = (x >> 8) & 0xFF;
|
||||
return 0;
|
||||
}
|
||||
|
||||
SEC("fmod_ret/hid_bpf_rdesc_fixup")
|
||||
int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hctx)
|
||||
{
|
||||
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
|
||||
|
||||
if (!data)
|
||||
return 0; /* EPERM check */
|
||||
|
||||
bpf_printk("rdesc: %02x %02x %02x",
|
||||
data[0],
|
||||
data[1],
|
||||
data[2]);
|
||||
bpf_printk(" %02x %02x %02x",
|
||||
data[3],
|
||||
data[4],
|
||||
data[5]);
|
||||
bpf_printk(" %02x %02x %02x ...",
|
||||
data[6],
|
||||
data[7],
|
||||
data[8]);
|
||||
|
||||
/*
|
||||
* The original report descriptor contains:
|
||||
*
|
||||
* 0x05, 0x01, // Usage Page (Generic Desktop) 30
|
||||
* 0x16, 0x01, 0x80, // Logical Minimum (-32767) 32
|
||||
* 0x26, 0xff, 0x7f, // Logical Maximum (32767) 35
|
||||
* 0x09, 0x30, // Usage (X) 38
|
||||
* 0x09, 0x31, // Usage (Y) 40
|
||||
*
|
||||
* So byte 39 contains Usage X and byte 41 Usage Y.
|
||||
*
|
||||
* We simply swap the axes here.
|
||||
*/
|
||||
data[39] = 0x31;
|
||||
data[41] = 0x30;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
155
samples/hid/hid_mouse.c
Normal file
155
samples/hid/hid_mouse.c
Normal file
@@ -0,0 +1,155 @@
|
||||
// SPDX-License-Identifier: GPL-2.0-only
|
||||
/* Copyright (c) 2022 Benjamin Tissoires
|
||||
*
|
||||
* This is a pure HID-BPF example, and should be considered as such:
|
||||
* on the Etekcity Scroll 6E, the X and Y axes will be swapped and
|
||||
* inverted. On any other device... Not sure what this will do.
|
||||
*
|
||||
* This C main file is generic though. To adapt the code and test, users
|
||||
* must amend only the .bpf.c file, which this program will load any
|
||||
* eBPF program it finds.
|
||||
*/
|
||||
|
||||
#include <assert.h>
|
||||
#include <errno.h>
|
||||
#include <fcntl.h>
|
||||
#include <libgen.h>
|
||||
#include <signal.h>
|
||||
#include <stdbool.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <sys/resource.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#include <linux/bpf.h>
|
||||
#include <linux/errno.h>
|
||||
|
||||
#include <bpf/bpf.h>
|
||||
#include <bpf/libbpf.h>
|
||||
|
||||
#include "hid_mouse.skel.h"
|
||||
#include "hid_bpf_attach.h"
|
||||
|
||||
static bool running = true;
|
||||
|
||||
static void int_exit(int sig)
|
||||
{
|
||||
running = false;
|
||||
exit(0);
|
||||
}
|
||||
|
||||
static void usage(const char *prog)
|
||||
{
|
||||
fprintf(stderr,
|
||||
"%s: %s /sys/bus/hid/devices/0BUS:0VID:0PID:00ID\n\n",
|
||||
__func__, prog);
|
||||
fprintf(stderr,
|
||||
"This program will upload and attach a HID-BPF program to the given device.\n"
|
||||
"On the Etekcity Scroll 6E, the X and Y axis will be inverted, but on any other\n"
|
||||
"device, chances are high that the device will not be working anymore\n\n"
|
||||
"consider this as a demo and adapt the eBPF program to your needs\n"
|
||||
"Hit Ctrl-C to unbind the program and reset the device\n");
|
||||
}
|
||||
|
||||
static int get_hid_id(const char *path)
|
||||
{
|
||||
const char *str_id, *dir;
|
||||
char uevent[1024];
|
||||
int fd;
|
||||
|
||||
memset(uevent, 0, sizeof(uevent));
|
||||
snprintf(uevent, sizeof(uevent) - 1, "%s/uevent", path);
|
||||
|
||||
fd = open(uevent, O_RDONLY | O_NONBLOCK);
|
||||
if (fd < 0)
|
||||
return -ENOENT;
|
||||
|
||||
close(fd);
|
||||
|
||||
dir = basename((char *)path);
|
||||
|
||||
str_id = dir + sizeof("0003:0001:0A37.");
|
||||
return (int)strtol(str_id, NULL, 16);
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
struct hid_mouse *skel;
|
||||
struct bpf_program *prog;
|
||||
int err;
|
||||
const char *optstr = "";
|
||||
const char *sysfs_path;
|
||||
int opt, hid_id, attach_fd;
|
||||
struct attach_prog_args args = {
|
||||
.retval = -1,
|
||||
};
|
||||
DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
|
||||
.ctx_in = &args,
|
||||
.ctx_size_in = sizeof(args),
|
||||
);
|
||||
|
||||
while ((opt = getopt(argc, argv, optstr)) != -1) {
|
||||
switch (opt) {
|
||||
default:
|
||||
usage(basename(argv[0]));
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
if (optind == argc) {
|
||||
usage(basename(argv[0]));
|
||||
return 1;
|
||||
}
|
||||
|
||||
sysfs_path = argv[optind];
|
||||
if (!sysfs_path) {
|
||||
perror("sysfs");
|
||||
return 1;
|
||||
}
|
||||
|
||||
skel = hid_mouse__open_and_load();
|
||||
if (!skel) {
|
||||
fprintf(stderr, "%s %s:%d", __func__, __FILE__, __LINE__);
|
||||
return -1;
|
||||
}
|
||||
|
||||
hid_id = get_hid_id(sysfs_path);
|
||||
|
||||
if (hid_id < 0) {
|
||||
fprintf(stderr, "can not open HID device: %m\n");
|
||||
return 1;
|
||||
}
|
||||
args.hid = hid_id;
|
||||
|
||||
attach_fd = bpf_program__fd(skel->progs.attach_prog);
|
||||
if (attach_fd < 0) {
|
||||
fprintf(stderr, "can't locate attach prog: %m\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
bpf_object__for_each_program(prog, *skel->skeleton->obj) {
|
||||
/* ignore syscalls */
|
||||
if (bpf_program__get_type(prog) != BPF_PROG_TYPE_TRACING)
|
||||
continue;
|
||||
|
||||
args.retval = -1;
|
||||
args.prog_fd = bpf_program__fd(prog);
|
||||
err = bpf_prog_test_run_opts(attach_fd, &tattr);
|
||||
if (err) {
|
||||
fprintf(stderr, "can't attach prog to hid device %d: %m (err: %d)\n",
|
||||
hid_id, err);
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
signal(SIGINT, int_exit);
|
||||
signal(SIGTERM, int_exit);
|
||||
|
||||
while (running)
|
||||
sleep(1);
|
||||
|
||||
hid_mouse__destroy(skel);
|
||||
|
||||
return 0;
|
||||
}
|
||||
134
samples/hid/hid_surface_dial.bpf.c
Normal file
134
samples/hid/hid_surface_dial.bpf.c
Normal file
@@ -0,0 +1,134 @@
|
||||
// SPDX-License-Identifier: GPL-2.0-only
|
||||
/* Copyright (c) 2022 Benjamin Tissoires
|
||||
*/
|
||||
|
||||
#include "vmlinux.h"
|
||||
#include <bpf/bpf_helpers.h>
|
||||
#include <bpf/bpf_tracing.h>
|
||||
#include "hid_bpf_helpers.h"
|
||||
|
||||
#define HID_UP_BUTTON 0x0009
|
||||
#define HID_GD_WHEEL 0x0038
|
||||
|
||||
SEC("fmod_ret/hid_bpf_device_event")
|
||||
int BPF_PROG(hid_event, struct hid_bpf_ctx *hctx)
|
||||
{
|
||||
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
|
||||
|
||||
if (!data)
|
||||
return 0; /* EPERM check */
|
||||
|
||||
/* Touch */
|
||||
data[1] &= 0xfd;
|
||||
|
||||
/* X */
|
||||
data[4] = 0;
|
||||
data[5] = 0;
|
||||
|
||||
/* Y */
|
||||
data[6] = 0;
|
||||
data[7] = 0;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* 72 == 360 / 5 -> 1 report every 5 degrees */
|
||||
int resolution = 72;
|
||||
int physical = 5;
|
||||
|
||||
struct haptic_syscall_args {
|
||||
unsigned int hid;
|
||||
int retval;
|
||||
};
|
||||
|
||||
static __u8 haptic_data[8];
|
||||
|
||||
SEC("syscall")
|
||||
int set_haptic(struct haptic_syscall_args *args)
|
||||
{
|
||||
struct hid_bpf_ctx *ctx;
|
||||
const size_t size = sizeof(haptic_data);
|
||||
u16 *res;
|
||||
int ret;
|
||||
|
||||
if (size > sizeof(haptic_data))
|
||||
return -7; /* -E2BIG */
|
||||
|
||||
ctx = hid_bpf_allocate_context(args->hid);
|
||||
if (!ctx)
|
||||
return -1; /* EPERM check */
|
||||
|
||||
haptic_data[0] = 1; /* report ID */
|
||||
|
||||
ret = hid_bpf_hw_request(ctx, haptic_data, size, HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
|
||||
|
||||
bpf_printk("probed/remove event ret value: %d", ret);
|
||||
bpf_printk("buf: %02x %02x %02x",
|
||||
haptic_data[0],
|
||||
haptic_data[1],
|
||||
haptic_data[2]);
|
||||
bpf_printk(" %02x %02x %02x",
|
||||
haptic_data[3],
|
||||
haptic_data[4],
|
||||
haptic_data[5]);
|
||||
bpf_printk(" %02x %02x",
|
||||
haptic_data[6],
|
||||
haptic_data[7]);
|
||||
|
||||
/* whenever resolution multiplier is not 3600, we have the fixed report descriptor */
|
||||
res = (u16 *)&haptic_data[1];
|
||||
if (*res != 3600) {
|
||||
// haptic_data[1] = 72; /* resolution multiplier */
|
||||
// haptic_data[2] = 0; /* resolution multiplier */
|
||||
// haptic_data[3] = 0; /* Repeat Count */
|
||||
haptic_data[4] = 3; /* haptic Auto Trigger */
|
||||
// haptic_data[5] = 5; /* Waveform Cutoff Time */
|
||||
// haptic_data[6] = 80; /* Retrigger Period */
|
||||
// haptic_data[7] = 0; /* Retrigger Period */
|
||||
} else {
|
||||
haptic_data[4] = 0;
|
||||
}
|
||||
|
||||
ret = hid_bpf_hw_request(ctx, haptic_data, size, HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
|
||||
|
||||
bpf_printk("set haptic ret value: %d -> %d", ret, haptic_data[4]);
|
||||
|
||||
args->retval = ret;
|
||||
|
||||
hid_bpf_release_context(ctx);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Convert REL_DIAL into REL_WHEEL */
|
||||
SEC("fmod_ret/hid_bpf_rdesc_fixup")
|
||||
int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hctx)
|
||||
{
|
||||
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
|
||||
__u16 *res, *phys;
|
||||
|
||||
if (!data)
|
||||
return 0; /* EPERM check */
|
||||
|
||||
/* Convert TOUCH into a button */
|
||||
data[31] = HID_UP_BUTTON;
|
||||
data[33] = 2;
|
||||
|
||||
/* Convert REL_DIAL into REL_WHEEL */
|
||||
data[45] = HID_GD_WHEEL;
|
||||
|
||||
/* Change Resolution Multiplier */
|
||||
phys = (__u16 *)&data[61];
|
||||
*phys = physical;
|
||||
res = (__u16 *)&data[66];
|
||||
*res = resolution;
|
||||
|
||||
/* Convert X,Y from Abs to Rel */
|
||||
data[88] = 0x06;
|
||||
data[98] = 0x06;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
u32 _version SEC("version") = 1;
|
||||
226
samples/hid/hid_surface_dial.c
Normal file
226
samples/hid/hid_surface_dial.c
Normal file
@@ -0,0 +1,226 @@
|
||||
// SPDX-License-Identifier: GPL-2.0-only
|
||||
/* Copyright (c) 2022 Benjamin Tissoires
|
||||
*
|
||||
* This program will morph the Microsoft Surface Dial into a mouse,
|
||||
* and depending on the chosen resolution enable or not the haptic feedback:
|
||||
* - a resolution (-r) of 3600 will report 3600 "ticks" in one full rotation
|
||||
* without haptic feedback
|
||||
* - any other resolution will report N "ticks" in a full rotation with haptic
|
||||
* feedback
|
||||
*
|
||||
* A good default for low resolution haptic scrolling is 72 (1 "tick" every 5
|
||||
* degrees), and set to 3600 for smooth scrolling.
|
||||
*/
|
||||
|
||||
#include <assert.h>
|
||||
#include <errno.h>
|
||||
#include <fcntl.h>
|
||||
#include <libgen.h>
|
||||
#include <signal.h>
|
||||
#include <stdbool.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <sys/resource.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#include <linux/bpf.h>
|
||||
#include <linux/errno.h>
|
||||
|
||||
#include <bpf/bpf.h>
|
||||
#include <bpf/libbpf.h>
|
||||
|
||||
#include "hid_surface_dial.skel.h"
|
||||
#include "hid_bpf_attach.h"
|
||||
|
||||
static bool running = true;
|
||||
|
||||
struct haptic_syscall_args {
|
||||
unsigned int hid;
|
||||
int retval;
|
||||
};
|
||||
|
||||
static void int_exit(int sig)
|
||||
{
|
||||
running = false;
|
||||
exit(0);
|
||||
}
|
||||
|
||||
static void usage(const char *prog)
|
||||
{
|
||||
fprintf(stderr,
|
||||
"%s: %s [OPTIONS] /sys/bus/hid/devices/0BUS:0VID:0PID:00ID\n\n"
|
||||
" OPTIONS:\n"
|
||||
" -r N\t set the given resolution to the device (number of ticks per 360°)\n\n",
|
||||
__func__, prog);
|
||||
fprintf(stderr,
|
||||
"This program will morph the Microsoft Surface Dial into a mouse,\n"
|
||||
"and depending on the chosen resolution enable or not the haptic feedback:\n"
|
||||
"- a resolution (-r) of 3600 will report 3600 'ticks' in one full rotation\n"
|
||||
" without haptic feedback\n"
|
||||
"- any other resolution will report N 'ticks' in a full rotation with haptic\n"
|
||||
" feedback\n"
|
||||
"\n"
|
||||
"A good default for low resolution haptic scrolling is 72 (1 'tick' every 5\n"
|
||||
"degrees), and set to 3600 for smooth scrolling.\n");
|
||||
}
|
||||
|
||||
static int get_hid_id(const char *path)
|
||||
{
|
||||
const char *str_id, *dir;
|
||||
char uevent[1024];
|
||||
int fd;
|
||||
|
||||
memset(uevent, 0, sizeof(uevent));
|
||||
snprintf(uevent, sizeof(uevent) - 1, "%s/uevent", path);
|
||||
|
||||
fd = open(uevent, O_RDONLY | O_NONBLOCK);
|
||||
if (fd < 0)
|
||||
return -ENOENT;
|
||||
|
||||
close(fd);
|
||||
|
||||
dir = basename((char *)path);
|
||||
|
||||
str_id = dir + sizeof("0003:0001:0A37.");
|
||||
return (int)strtol(str_id, NULL, 16);
|
||||
}
|
||||
|
||||
static int attach_prog(struct hid_surface_dial *skel, struct bpf_program *prog, int hid_id)
|
||||
{
|
||||
struct attach_prog_args args = {
|
||||
.hid = hid_id,
|
||||
.retval = -1,
|
||||
};
|
||||
int attach_fd, err;
|
||||
DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
|
||||
.ctx_in = &args,
|
||||
.ctx_size_in = sizeof(args),
|
||||
);
|
||||
|
||||
attach_fd = bpf_program__fd(skel->progs.attach_prog);
|
||||
if (attach_fd < 0) {
|
||||
fprintf(stderr, "can't locate attach prog: %m\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
args.prog_fd = bpf_program__fd(prog);
|
||||
err = bpf_prog_test_run_opts(attach_fd, &tattr);
|
||||
if (err) {
|
||||
fprintf(stderr, "can't attach prog to hid device %d: %m (err: %d)\n",
|
||||
hid_id, err);
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int set_haptic(struct hid_surface_dial *skel, int hid_id)
|
||||
{
|
||||
struct haptic_syscall_args args = {
|
||||
.hid = hid_id,
|
||||
.retval = -1,
|
||||
};
|
||||
int haptic_fd, err;
|
||||
DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
|
||||
.ctx_in = &args,
|
||||
.ctx_size_in = sizeof(args),
|
||||
);
|
||||
|
||||
haptic_fd = bpf_program__fd(skel->progs.set_haptic);
|
||||
if (haptic_fd < 0) {
|
||||
fprintf(stderr, "can't locate haptic prog: %m\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
err = bpf_prog_test_run_opts(haptic_fd, &tattr);
|
||||
if (err) {
|
||||
fprintf(stderr, "can't set haptic configuration to hid device %d: %m (err: %d)\n",
|
||||
hid_id, err);
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
struct hid_surface_dial *skel;
|
||||
struct bpf_program *prog;
|
||||
const char *optstr = "r:";
|
||||
const char *sysfs_path;
|
||||
int opt, hid_id, resolution = 72;
|
||||
|
||||
while ((opt = getopt(argc, argv, optstr)) != -1) {
|
||||
switch (opt) {
|
||||
case 'r':
|
||||
{
|
||||
char *endp = NULL;
|
||||
long l = -1;
|
||||
|
||||
if (optarg) {
|
||||
l = strtol(optarg, &endp, 10);
|
||||
if (endp && *endp)
|
||||
l = -1;
|
||||
}
|
||||
|
||||
if (l < 0) {
|
||||
fprintf(stderr,
|
||||
"invalid r option %s - expecting a number\n",
|
||||
optarg ? optarg : "");
|
||||
exit(EXIT_FAILURE);
|
||||
};
|
||||
|
||||
resolution = (int) l;
|
||||
break;
|
||||
}
|
||||
default:
|
||||
usage(basename(argv[0]));
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
if (optind == argc) {
|
||||
usage(basename(argv[0]));
|
||||
return 1;
|
||||
}
|
||||
|
||||
sysfs_path = argv[optind];
|
||||
if (!sysfs_path) {
|
||||
perror("sysfs");
|
||||
return 1;
|
||||
}
|
||||
|
||||
skel = hid_surface_dial__open_and_load();
|
||||
if (!skel) {
|
||||
fprintf(stderr, "%s %s:%d", __func__, __FILE__, __LINE__);
|
||||
return -1;
|
||||
}
|
||||
|
||||
hid_id = get_hid_id(sysfs_path);
|
||||
if (hid_id < 0) {
|
||||
fprintf(stderr, "can not open HID device: %m\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
skel->data->resolution = resolution;
|
||||
skel->data->physical = (int)(resolution / 72);
|
||||
|
||||
bpf_object__for_each_program(prog, *skel->skeleton->obj) {
|
||||
/* ignore syscalls */
|
||||
if (bpf_program__get_type(prog) != BPF_PROG_TYPE_TRACING)
|
||||
continue;
|
||||
|
||||
attach_prog(skel, prog, hid_id);
|
||||
}
|
||||
|
||||
signal(SIGINT, int_exit);
|
||||
signal(SIGTERM, int_exit);
|
||||
|
||||
set_haptic(skel, hid_id);
|
||||
|
||||
while (running)
|
||||
sleep(1);
|
||||
|
||||
hid_surface_dial__destroy(skel);
|
||||
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user