From: Benjamin Tissoires <bentiss@kernel.org>
To: Jiri Kosina <jikos@kernel.org>,
Benjamin Tissoires <benjamin.tissoires@redhat.com>,
Dan Carpenter <dan.carpenter@linaro.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org, Benjamin Tissoires <bentiss@kernel.org>
Subject: [PATCH v2 3/3] HID: bpf: use __bpf_kfunc instead of noinline
Date: Wed, 24 Jan 2024 12:26:59 +0100 [thread overview]
Message-ID: <20240124-b4-hid-bpf-fixes-v2-3-052520b1e5e6@kernel.org> (raw)
In-Reply-To: <20240124-b4-hid-bpf-fixes-v2-0-052520b1e5e6@kernel.org>
Follow the docs at Documentation/bpf/kfuncs.rst:
- declare the function with `__bpf_kfunc`
- disables missing prototype warnings, which allows to remove them from
include/linux/hid-bpf.h
Removing the prototypes is not an issue because we currently have to
redeclare them when writing the BPF program. They will eventually be
generated by bpftool directly AFAIU.
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
changes in v2:
* make use of __bpf_kfunc_start/end_defs() instead of manual push/pop
---
drivers/hid/bpf/hid_bpf_dispatch.c | 18 +++++++++++++-----
include/linux/hid_bpf.h | 11 -----------
2 files changed, 13 insertions(+), 16 deletions(-)
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 7903c8638e81..470ae2c29c94 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -143,6 +143,9 @@ u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *s
}
EXPORT_SYMBOL_GPL(call_hid_bpf_rdesc_fixup);
+/* Disables missing prototype warnings */
+__bpf_kfunc_start_defs();
+
/**
* hid_bpf_get_data - Get the kernel memory pointer associated with the context @ctx
*
@@ -152,7 +155,7 @@ EXPORT_SYMBOL_GPL(call_hid_bpf_rdesc_fixup);
*
* @returns %NULL on error, an %__u8 memory pointer on success
*/
-noinline __u8 *
+__bpf_kfunc __u8 *
hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr_buf_size)
{
struct hid_bpf_ctx_kern *ctx_kern;
@@ -167,6 +170,7 @@ hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr
return ctx_kern->data + offset;
}
+__bpf_kfunc_end_defs();
/*
* The following set contains all functions we agree BPF programs
@@ -274,6 +278,9 @@ static int do_hid_bpf_attach_prog(struct hid_device *hdev, int prog_fd, struct b
return fd;
}
+/* Disables missing prototype warnings */
+__bpf_kfunc_start_defs();
+
/**
* hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device
*
@@ -286,7 +293,7 @@ static int do_hid_bpf_attach_prog(struct hid_device *hdev, int prog_fd, struct b
* is pinned to the BPF file system).
*/
/* called from syscall */
-noinline int
+__bpf_kfunc int
hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
{
struct hid_device *hdev;
@@ -338,7 +345,7 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
*
* @returns A pointer to &struct hid_bpf_ctx on success, %NULL on error.
*/
-noinline struct hid_bpf_ctx *
+__bpf_kfunc struct hid_bpf_ctx *
hid_bpf_allocate_context(unsigned int hid_id)
{
struct hid_device *hdev;
@@ -371,7 +378,7 @@ hid_bpf_allocate_context(unsigned int hid_id)
* @ctx: the HID-BPF context to release
*
*/
-noinline void
+__bpf_kfunc void
hid_bpf_release_context(struct hid_bpf_ctx *ctx)
{
struct hid_bpf_ctx_kern *ctx_kern;
@@ -397,7 +404,7 @@ hid_bpf_release_context(struct hid_bpf_ctx *ctx)
*
* @returns %0 on success, a negative error code otherwise.
*/
-noinline int
+__bpf_kfunc int
hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz,
enum hid_report_type rtype, enum hid_class_request reqtype)
{
@@ -465,6 +472,7 @@ hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz,
kfree(dma_data);
return ret;
}
+__bpf_kfunc_end_defs();
/* our HID-BPF entrypoints */
BTF_SET8_START(hid_bpf_fmodret_ids)
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index 840cd254172d..7118ac28d468 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -77,17 +77,6 @@ enum hid_bpf_attach_flags {
int hid_bpf_device_event(struct hid_bpf_ctx *ctx);
int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx);
-/* Following functions are kfunc that we export to BPF programs */
-/* available everywhere in HID-BPF */
-__u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t __sz);
-
-/* only available in syscall */
-int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags);
-int hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz,
- enum hid_report_type rtype, enum hid_class_request reqtype);
-struct hid_bpf_ctx *hid_bpf_allocate_context(unsigned int hid_id);
-void hid_bpf_release_context(struct hid_bpf_ctx *ctx);
-
/*
* Below is HID internal
*/
--
2.43.0
next prev parent reply other threads:[~2024-01-24 11:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-24 11:26 [PATCH v2 0/3] HID: bpf: couple of upstream fixes Benjamin Tissoires
2024-01-24 11:26 ` [PATCH v2 1/3] HID: bpf: remove double fdget() Benjamin Tissoires
2024-01-24 11:26 ` [PATCH v2 2/3] HID: bpf: actually free hdev memory after attaching a HID-BPF program Benjamin Tissoires
2024-01-26 11:20 ` Benjamin Tissoires
2024-01-24 11:26 ` Benjamin Tissoires [this message]
2024-01-31 10:38 ` [PATCH v2 0/3] HID: bpf: couple of upstream fixes Benjamin Tissoires
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240124-b4-hid-bpf-fixes-v2-3-052520b1e5e6@kernel.org \
--to=bentiss@kernel.org \
--cc=andrii.nakryiko@gmail.com \
--cc=benjamin.tissoires@redhat.com \
--cc=bpf@vger.kernel.org \
--cc=dan.carpenter@linaro.org \
--cc=daniel@iogearbox.net \
--cc=jikos@kernel.org \
--cc=linux-input@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).