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selftests/hid: ensure we can compile the tests on kernels pre-6.3

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For the hid-bpf tests to compile, we need to have the definition of
struct hid_bpf_ctx. This definition is an internal one from the kernel
and it is supposed to be defined in the generated vmlinux.h.

This vmlinux.h header is generated based on the currently running kernel
or if the kernel was already compiled in the tree. If you just compile
the selftests without compiling the kernel beforehand and you are running
on a 6.2 kernel, you'll end up with a vmlinux.h without the hid_bpf_ctx
definition.

Use the clever trick from tools/testing/selftests/bpf/progs/bpf_iter.h
to force the definition of that symbol in case we don't find it in the
BTF and also add __attribute__((preserve_access_index)) to further
support CO-RE functionality for these tests.

Signed-off-by: Justin Stitt <justinstitt@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com> # Build
Tested-by: Justin Stitt <justinstitt@google.com>
Link: https://lore.kernel.org/r/20230825-wip-selftests-v3-1-639963c54109@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This commit is contained in:
Benjamin Tissoires 2023-10-05 17:55:32 +02:00
parent 19fbf677b2
commit ae7487d112
2 changed files with 77 additions and 3 deletions
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3
tools/testing/selftests/hid/progs/hid.c
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@ -1,8 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Red hat */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "hid_bpf_helpers.h"
char _license[] SEC("license") = "GPL";

77
tools/testing/selftests/hid/progs/hid_bpf_helpers.h
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@ -5,6 +5,83 @@
#ifndef __HID_BPF_HELPERS_H
#define __HID_BPF_HELPERS_H
/* "undefine" structs and enums in vmlinux.h, because we "override" them below */
#define hid_bpf_ctx hid_bpf_ctx___not_used
#define hid_report_type hid_report_type___not_used
#define hid_class_request hid_class_request___not_used
#define hid_bpf_attach_flags hid_bpf_attach_flags___not_used
#define HID_INPUT_REPORT HID_INPUT_REPORT___not_used
#define HID_OUTPUT_REPORT HID_OUTPUT_REPORT___not_used
#define HID_FEATURE_REPORT HID_FEATURE_REPORT___not_used
#define HID_REPORT_TYPES HID_REPORT_TYPES___not_used
#define HID_REQ_GET_REPORT HID_REQ_GET_REPORT___not_used
#define HID_REQ_GET_IDLE HID_REQ_GET_IDLE___not_used
#define HID_REQ_GET_PROTOCOL HID_REQ_GET_PROTOCOL___not_used
#define HID_REQ_SET_REPORT HID_REQ_SET_REPORT___not_used
#define HID_REQ_SET_IDLE HID_REQ_SET_IDLE___not_used
#define HID_REQ_SET_PROTOCOL HID_REQ_SET_PROTOCOL___not_used
#define HID_BPF_FLAG_NONE HID_BPF_FLAG_NONE___not_used
#define HID_BPF_FLAG_INSERT_HEAD HID_BPF_FLAG_INSERT_HEAD___not_used
#define HID_BPF_FLAG_MAX HID_BPF_FLAG_MAX___not_used
#include "vmlinux.h"
#undef hid_bpf_ctx
#undef hid_report_type
#undef hid_class_request
#undef hid_bpf_attach_flags
#undef HID_INPUT_REPORT
#undef HID_OUTPUT_REPORT
#undef HID_FEATURE_REPORT
#undef HID_REPORT_TYPES
#undef HID_REQ_GET_REPORT
#undef HID_REQ_GET_IDLE
#undef HID_REQ_GET_PROTOCOL
#undef HID_REQ_SET_REPORT
#undef HID_REQ_SET_IDLE
#undef HID_REQ_SET_PROTOCOL
#undef HID_BPF_FLAG_NONE
#undef HID_BPF_FLAG_INSERT_HEAD
#undef HID_BPF_FLAG_MAX
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <linux/const.h>
enum hid_report_type {
HID_INPUT_REPORT = 0,
HID_OUTPUT_REPORT = 1,
HID_FEATURE_REPORT = 2,
HID_REPORT_TYPES,
};
struct hid_bpf_ctx {
__u32 index;
const struct hid_device *hid;
__u32 allocated_size;
enum hid_report_type report_type;
union {
__s32 retval;
__s32 size;
};
} __attribute__((preserve_access_index));
enum hid_class_request {
HID_REQ_GET_REPORT = 0x01,
HID_REQ_GET_IDLE = 0x02,
HID_REQ_GET_PROTOCOL = 0x03,
HID_REQ_SET_REPORT = 0x09,
HID_REQ_SET_IDLE = 0x0A,
HID_REQ_SET_PROTOCOL = 0x0B,
};
enum hid_bpf_attach_flags {
HID_BPF_FLAG_NONE = 0,
HID_BPF_FLAG_INSERT_HEAD = _BITUL(0),
HID_BPF_FLAG_MAX,
};
/* following are kfuncs exported by HID for HID-BPF */
extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx,
unsigned int offset,