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From: Benjamin Tissoires <bentiss@kernel.org>
Date: Fri, 09 Feb 2024 14:26:43 +0100
Subject: [PATCH RFC bpf-next 7/9] HID: bpf: allow to defer work in a
 delayed workqueue
Precedence: bulk
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Message-Id: <20240209-hid-bpf-sleepable-v1-7-4cc895b5adbd@kernel.org>
References: <20240209-hid-bpf-sleepable-v1-0-4cc895b5adbd@kernel.org>
In-Reply-To: <20240209-hid-bpf-sleepable-v1-0-4cc895b5adbd@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>, 
 Daniel Borkmann <daniel@iogearbox.net>, 
 John Fastabend <john.fastabend@gmail.com>, 
 Andrii Nakryiko <andrii@kernel.org>, 
 Martin KaFai Lau <martin.lau@linux.dev>, 
 Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>, 
 Yonghong Song <yonghong.song@linux.dev>, KP Singh <kpsingh@kernel.org>, 
 Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>, 
 Jiri Olsa <jolsa@kernel.org>, Jiri Kosina <jikos@kernel.org>, 
 Benjamin Tissoires <benjamin.tissoires@redhat.com>, 
 Jonathan Corbet <corbet@lwn.net>, Shuah Khan <shuah@kernel.org>
Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, 
 linux-input@vger.kernel.org, linux-doc@vger.kernel.org, 
 linux-kselftest@vger.kernel.org, Benjamin Tissoires <bentiss@kernel.org>

This allows to defer work for later for being able to:
1. defer an event:
   Sometimes we receive an out of proximity event, but the device can not
   be trusted enough, and we need to ensure that we won't receive another
   one in the n following milliseconds. So we need to wait those n
   milliseconds, and eventually re-inject that event in the stack.

2. inject new events in reaction to one given event:
   We might want to transform one given event into several. This is the
   case for macro keys where a single key press is supposed to send
   a sequence of key presses. But this could also be used to patch a
   faulty behavior, if a device forgets to send a release event

3. communicate with the device in reaction to one event:
   We might want to communicate back to the device after a given event.
   For example a device might send us an event saying that it came back
   from sleep state and needs to be re-initialized.

Currently we can achieve that by keeping a userspace program around,
raise a bpf event, and let that userspace program inject the events and
commands.
However, we are just keeping that program alive as a daemon for just
scheduling commands, so there is no logic that would justify an actual
userspace wakeup. So a kernel workqueue is simpler to handle.

Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
 Documentation/hid/hid-bpf.rst                   |  24 ++-
 drivers/hid/bpf/entrypoints/entrypoints.bpf.c   |   8 +
 drivers/hid/bpf/entrypoints/entrypoints.lskel.h | 236 +++++++++++++++---------
 drivers/hid/bpf/hid_bpf_dispatch.c              |  94 +++++++++-
 drivers/hid/bpf/hid_bpf_jmp_table.c             |  34 +++-
 include/linux/hid_bpf.h                         |   7 +
 6 files changed, 307 insertions(+), 96 deletions(-)

diff --git a/Documentation/hid/hid-bpf.rst b/Documentation/hid/hid-bpf.rst
index 0765b3298ecf..25b157fd8ed2 100644
--- a/Documentation/hid/hid-bpf.rst
+++ b/Documentation/hid/hid-bpf.rst
@@ -140,6 +140,7 @@ HID-BPF has the following attachment types available:
 1. event processing/filtering with ``SEC("fmod_ret/hid_bpf_device_event")`` in libbpf
 2. actions coming from userspace with ``SEC("syscall")`` in libbpf
 3. change of the report descriptor with ``SEC("fmod_ret/hid_bpf_rdesc_fixup")`` in libbpf
+4. execute a delayed action with ``SEC("fmod_ret.s/hid_bpf_offload")`` in libbpf
 
 A ``hid_bpf_device_event`` is calling a BPF program when an event is received from
 the device. Thus we are in IRQ context and can act on the data or notify userspace.
@@ -149,6 +150,12 @@ A ``syscall`` means that userspace called the syscall ``BPF_PROG_RUN`` facility.
 This time, we can do any operations allowed by HID-BPF, and talking to the device is
 allowed.
 
+A ``hid_bpf_offload`` is called whenever a HID-BPF program attached to ``hid_bpf_device_event``
+is calling the kfunc ``hid_bpf_schedule_delayed_work``. The jobs are globally
+shared per HID device, this might be called more than expected, because another
+HID-BPF program might call ``hid_bpf_schedule_delayed_work``. So please ensure
+you actually have job scheduled.
+
 Last, ``hid_bpf_rdesc_fixup`` is different from the others as there can be only one
 BPF program of this type. This is called on ``probe`` from the driver and allows to
 change the report descriptor from the BPF program. Once a ``hid_bpf_rdesc_fixup``
@@ -167,13 +174,13 @@ Available tracing functions to attach a HID-BPF program:
 --------------------------------------------------------
 
 .. kernel-doc:: drivers/hid/bpf/hid_bpf_dispatch.c
-   :functions: hid_bpf_device_event hid_bpf_rdesc_fixup
+   :functions: hid_bpf_device_event hid_bpf_rdesc_fixup hid_bpf_offload
 
 Available API that can be used in all HID-BPF programs:
 -------------------------------------------------------
 
 .. kernel-doc:: drivers/hid/bpf/hid_bpf_dispatch.c
-   :functions: hid_bpf_get_data
+   :functions: hid_bpf_get_data hid_bpf_schedule_delayed_work
 
 Available API that can be used in syscall HID-BPF programs:
 -----------------------------------------------------------
@@ -181,6 +188,19 @@ Available API that can be used in syscall HID-BPF programs:
 .. kernel-doc:: drivers/hid/bpf/hid_bpf_dispatch.c
    :functions: hid_bpf_attach_prog hid_bpf_hw_request hid_bpf_hw_output_report hid_bpf_input_report hid_bpf_allocate_context hid_bpf_release_context
 
+Available API that can be used in sleepable HID-BPF programs:
+-------------------------------------------------------------
+
+When using a sleepable HID-BPF program (attached with ``SEC("fmod_ret.s/hid_bpf_offload")``),
+you can use the following functions:
+
+- ``hid_bpf_hw_request``
+- ``hid_bpf_hw_output_report``
+- ``hid_bpf_input_report``
+- ``hid_bpf_schedule_delayed_work``
+- ``hid_bpf_allocate_context``
+- ``hid_bpf_release_context``
+
 General overview of a HID-BPF program
 =====================================
 
diff --git a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
index c22921125a1a..fe7d5c808034 100644
--- a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
+++ b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
@@ -22,4 +22,12 @@ int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx)
 	return 0;
 }
 
+SEC("fmod_ret.s/__hid_bpf_tail_call_sleepable")
+int BPF_PROG(hid_tail_call_sleepable, 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
index 35618051598c..8883c436ab8c 100644
--- a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
+++ b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
@@ -12,9 +12,11 @@ struct entrypoints_bpf {
 	} maps;
 	struct {
 		struct bpf_prog_desc hid_tail_call;
+		struct bpf_prog_desc hid_tail_call_sleepable;
 	} progs;
 	struct {
 		int hid_tail_call_fd;
+		int hid_tail_call_sleepable_fd;
 	} links;
 };
 
@@ -29,12 +31,24 @@ entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel)
 	return fd;
 }
 
+static inline int
+entrypoints_bpf__hid_tail_call_sleepable__attach(struct entrypoints_bpf *skel)
+{
+	int prog_fd = skel->progs.hid_tail_call_sleepable.prog_fd;
+	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+	if (fd > 0)
+		skel->links.hid_tail_call_sleepable_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);
+	ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call_sleepable__attach(skel);
 	return ret < 0 ? ret : 0;
 }
 
@@ -42,6 +56,7 @@ static inline void
 entrypoints_bpf__detach(struct entrypoints_bpf *skel)
 {
 	skel_closenz(skel->links.hid_tail_call_fd);
+	skel_closenz(skel->links.hid_tail_call_sleepable_fd);
 }
 static void
 entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
@@ -50,6 +65,7 @@ entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
 		return;
 	entrypoints_bpf__detach(skel);
 	skel_closenz(skel->progs.hid_tail_call.prog_fd);
+	skel_closenz(skel->progs.hid_tail_call_sleepable.prog_fd);
 	skel_closenz(skel->maps.hid_jmp_table.map_fd);
 	skel_free(skel);
 }
@@ -73,10 +89,7 @@ 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 *)"\
+	static const char opts_data[] __attribute__((__aligned__(8))) = "\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
@@ -110,7 +123,7 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\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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-\x18\0\0\0\0\0\0\0\x60\x02\0\0\x60\x02\0\0\x12\x02\0\0\0\0\0\0\0\0\0\x02\x03\0\
+\x18\0\0\0\0\0\0\0\x80\x02\0\0\x80\x02\0\0\x93\x02\0\0\0\0\0\0\0\0\0\x02\x03\0\
 \0\0\x01\0\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\
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@@ -123,96 +136,141 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
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+\x0a\0\0\xb7\x03\0\0\x48\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\xc5\x07\
+\xc7\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x63\x71\0\0\0\0\0\0\x18\
+\x60\0\0\0\0\0\0\0\0\0\0\x98\x0a\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x30\x0b\0\0\
+\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xa0\x0a\0\0\x18\x61\0\0\0\0\0\
+\0\0\0\0\0\x28\x0b\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xd8\x0a\
+\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x70\x0b\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\
+\0\0\0\0\0\0\0\xe0\x0a\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x80\x0b\0\0\x7b\x01\0\0\
+\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x10\x0b\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\
+\xa0\x0b\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x18\x61\0\
+\0\0\0\0\0\0\0\0\0\x98\x0b\0\0\x7b\x01\0\0\0\0\0\0\x61\x60\x08\0\0\0\0\0\x18\
+\x61\0\0\0\0\0\0\0\0\0\0\x38\x0b\0\0\x63\x01\0\0\0\0\0\0\x61\x60\x0c\0\0\0\0\0\
+\x18\x61\0\0\0\0\0\0\0\0\0\0\x3c\x0b\0\0\x63\x01\0\0\0\0\0\0\x79\x60\x10\0\0\0\
+\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x40\x0b\0\0\x7b\x01\0\0\0\0\0\0\x61\xa0\x78\
+\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x68\x0b\0\0\x63\x01\0\0\0\0\0\0\x18\
+\x61\0\0\0\0\0\0\0\0\0\0\xb0\x0b\0\0\xb7\x02\0\0\x14\0\0\0\xb7\x03\0\0\x0c\0\0\
+\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\0\xbf\x07\0\0\0\0\0\0\xc5\x07\x8e\xff\
+\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x20\x0b\0\0\x63\x70\x6c\0\0\0\0\0\x77\x07\
+\0\0\x20\0\0\0\x63\x70\x70\0\0\0\0\0\xb7\x01\0\0\x05\0\0\0\x18\x62\0\0\0\0\0\0\
+\0\0\0\0\x20\x0b\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\
+\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x90\x0b\0\0\x61\x01\0\0\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\xc5\x07\x7c\xff\0\0\0\0\x63\
+\x7a\x80\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xc8\x0b\0\0\x18\x61\0\0\0\0\0\
+\0\0\0\0\0\x60\x0c\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xd0\x0b\
+\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x58\x0c\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\
+\0\0\0\0\0\0\0\x08\x0c\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xa0\x0c\0\0\x7b\x01\0\0\
+\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x10\x0c\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\
+\xb0\x0c\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x40\x0c\0\0\x18\
+\x61\0\0\0\0\0\0\0\0\0\0\xd0\x0c\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xc8\x0c\0\0\x7b\x01\0\0\0\0\0\0\x61\
+\x60\x08\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x68\x0c\0\0\x63\x01\0\0\0\0\0\0\
+\x61\x60\x0c\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x6c\x0c\0\0\x63\x01\0\0\0\0\
+\0\0\x79\x60\x10\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x70\x0c\0\0\x7b\x01\0\0\
+\0\0\0\0\x61\xa0\x78\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x98\x0c\0\0\x63\
+\x01\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xe0\x0c\0\0\xb7\x02\0\0\x1e\0\0\0\
+\xb7\x03\0\0\x0c\0\0\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\0\xbf\x07\0\0\0\0\
+\0\0\xc5\x07\x45\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x50\x0c\0\0\x63\x70\
+\x6c\0\0\0\0\0\x77\x07\0\0\x20\0\0\0\x63\x70\x70\0\0\0\0\0\xb7\x01\0\0\x05\0\0\
+\0\x18\x62\0\0\0\0\0\0\0\0\0\0\x50\x0c\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\xa6\
+\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xc0\x0c\0\0\x61\x01\0\0\
+\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\xc5\x07\
+\x33\xff\0\0\0\0\x63\x7a\x84\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\x61\xa0\x84\xff\0\0\0\0\x63\x06\x2c\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";
+
+	opts.ctx = (struct bpf_loader_ctx *)skel;
+	opts.data_sz = sizeof(opts_data) - 1;
+	opts.data = (void *)opts_data;
+	opts.insns_sz = sizeof(opts_insn) - 1;
+	opts.insns = (void *)opts_insn;
+
 	err = bpf_load_and_run(&opts);
 	if (err < 0)
 		return err;
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index e1a650f4a626..afb409a76a63 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -105,6 +105,25 @@ __weak noinline int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx)
 	return 0;
 }
 
+/**
+ * hid_bpf_offload - Called when the workqueue attached to the HID device
+ * is triggered
+ *
+ * @ctx: The HID-BPF context
+ *
+ * @return 0 on success and keep processing; a negative error code to interrupt
+ * the processing of this job.
+ *
+ * Declare an %fmod_ret tracing bpf program to this function and attach this
+ * program through hid_bpf_attach_prog() to have this helper called whenever
+ * hid_bpf_schedule_delayed_work() is called.
+ */
+/* never used by the kernel but declared so we can load and attach a tracepoint */
+__weak noinline int hid_bpf_offload(struct hid_bpf_ctx *ctx)
+{
+	return 0;
+}
+
 u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size)
 {
 	int ret;
@@ -203,6 +222,35 @@ int hid_bpf_reconnect(struct hid_device *hdev)
 	return 0;
 }
 
+static void delayed_work_cb(struct work_struct *work)
+{
+	struct hid_device *hdev = container_of(work, struct hid_device,
+					       bpf.work.work);
+	struct hid_bpf_ctx_kern ctx_kern = {
+		.ctx = {
+			.hid = hdev,
+		},
+	};
+	int ret;
+
+	/* no program has been attached yet */
+	if (!hdev->bpf.work_initialized || hdev->bpf.destroyed)
+		return;
+
+	ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_OFFLOAD, &ctx_kern);
+	if (ret < 0)
+		hid_warn_once(hdev, "error while executing HID-BPF delayed work: %d", ret);
+}
+
+static void hid_bpf_prep_worker(struct hid_device *hdev)
+{
+	if (hdev->bpf.work_initialized)
+		return;
+
+	INIT_DELAYED_WORK(&hdev->bpf.work, delayed_work_cb);
+	hdev->bpf.work_initialized = true;
+}
+
 static int do_hid_bpf_attach_prog(struct hid_device *hdev, int prog_fd, struct bpf_prog *prog,
 				  __u32 flags)
 {
@@ -215,10 +263,15 @@ static int do_hid_bpf_attach_prog(struct hid_device *hdev, int prog_fd, struct b
 	if (prog_type >= HID_BPF_PROG_TYPE_MAX)
 		return -EINVAL;
 
-	if (prog_type == HID_BPF_PROG_TYPE_DEVICE_EVENT) {
+	switch (prog_type) {
+	case HID_BPF_PROG_TYPE_DEVICE_EVENT:
 		err = hid_bpf_allocate_event_data(hdev);
 		if (err)
 			return err;
+		break;
+	case HID_BPF_PROG_TYPE_OFFLOAD:
+		hid_bpf_prep_worker(hdev);
+		break;
 	}
 
 	fd = __hid_bpf_attach_prog(hdev, prog_type, prog_fd, prog, flags);
@@ -536,6 +589,34 @@ hid_bpf_input_report(struct hid_bpf_ctx *ctx, enum hid_report_type type, u8 *buf
 
 	return hid_input_report(hdev, type, buf, size, 0);
 }
+
+/**
+ * hid_bpf_schedule_delayed_work - Put work task in the worqueue associated
+ * with the HID device
+ *
+ * @ctx: The HID-BPF context
+ * @delay_ms: a delay in milli seconds, or 0 for immediate execution
+ *
+ * Return: %false if @work was already on a queue, %true otherwise.  If
+ * @delay is zero and @work is idle, it will be scheduled for immediate
+ * execution.
+ */
+__bpf_kfunc bool
+hid_bpf_schedule_delayed_work(struct hid_bpf_ctx *ctx, unsigned int delay_ms)
+{
+	struct hid_device *hdev;
+
+	if (!ctx)
+		return -EINVAL;
+
+	hdev = (struct hid_device *)ctx->hid; /* discard const */
+
+	if (!hdev->bpf.work_initialized) {
+		return -EINVAL;
+	}
+
+	return schedule_delayed_work(&hdev->bpf.work, msecs_to_jiffies(delay_ms));
+}
 __bpf_kfunc_end_defs();
 
 /*
@@ -544,6 +625,12 @@ __bpf_kfunc_end_defs();
  */
 BTF_KFUNCS_START(hid_bpf_kfunc_ids)
 BTF_ID_FLAGS(func, hid_bpf_get_data, KF_RET_NULL)
+BTF_ID_FLAGS(func, hid_bpf_schedule_delayed_work)
+BTF_ID_FLAGS(func, hid_bpf_hw_request, KF_SLEEPABLE)
+BTF_ID_FLAGS(func, hid_bpf_hw_output_report, KF_SLEEPABLE)
+BTF_ID_FLAGS(func, hid_bpf_input_report, KF_SLEEPABLE)
+BTF_ID_FLAGS(func, hid_bpf_allocate_context, KF_ACQUIRE | KF_RET_NULL | KF_SLEEPABLE)
+BTF_ID_FLAGS(func, hid_bpf_release_context, KF_RELEASE | KF_SLEEPABLE)
 BTF_KFUNCS_END(hid_bpf_kfunc_ids)
 
 static const struct btf_kfunc_id_set hid_bpf_kfunc_set = {
@@ -555,7 +642,9 @@ static const struct btf_kfunc_id_set hid_bpf_kfunc_set = {
 BTF_SET8_START(hid_bpf_fmodret_ids)
 BTF_ID_FLAGS(func, hid_bpf_device_event)
 BTF_ID_FLAGS(func, hid_bpf_rdesc_fixup)
+BTF_ID_FLAGS(func, hid_bpf_offload, KF_SLEEPABLE)
 BTF_ID_FLAGS(func, __hid_bpf_tail_call)
+BTF_ID_FLAGS(func, __hid_bpf_tail_call_sleepable, KF_SLEEPABLE)
 BTF_SET8_END(hid_bpf_fmodret_ids)
 
 static const struct btf_kfunc_id_set hid_bpf_fmodret_set = {
@@ -610,6 +699,9 @@ void hid_bpf_destroy_device(struct hid_device *hdev)
 	/* mark the device as destroyed in bpf so we don't reattach it */
 	hdev->bpf.destroyed = true;
 
+	if (hdev->bpf.work_initialized)
+		cancel_delayed_work_sync(&hdev->bpf.work);
+
 	__hid_bpf_destroy_device(hdev);
 }
 EXPORT_SYMBOL_GPL(hid_bpf_destroy_device);
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index aa8e1c79cdf5..d401add0e2ab 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -59,6 +59,7 @@ static DECLARE_WORK(release_work, hid_bpf_release_progs);
 BTF_ID_LIST(hid_bpf_btf_ids)
 BTF_ID(func, hid_bpf_device_event)			/* HID_BPF_PROG_TYPE_DEVICE_EVENT */
 BTF_ID(func, hid_bpf_rdesc_fixup)			/* HID_BPF_PROG_TYPE_RDESC_FIXUP */
+BTF_ID(func, hid_bpf_offload)				/* HID_BPF_PROG_TYPE_OFFLOAD */
 
 static int hid_bpf_max_programs(enum hid_bpf_prog_type type)
 {
@@ -67,6 +68,8 @@ static int hid_bpf_max_programs(enum hid_bpf_prog_type type)
 		return HID_BPF_MAX_PROGS_PER_DEV;
 	case HID_BPF_PROG_TYPE_RDESC_FIXUP:
 		return 1;
+	case HID_BPF_PROG_TYPE_OFFLOAD:
+		return HID_BPF_MAX_PROGS_PER_DEV;
 	default:
 		return -EINVAL;
 	}
@@ -104,14 +107,30 @@ __weak noinline int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx)
 	return 0;
 }
 
+__weak noinline int __hid_bpf_tail_call_sleepable(struct hid_bpf_ctx *ctx)
+{
+	return 0;
+}
+
 int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
 		     struct hid_bpf_ctx_kern *ctx_kern)
 {
 	struct hid_bpf_prog_list *prog_list;
 	int i, idx, err = 0;
 
-	rcu_read_lock();
-	prog_list = rcu_dereference(hdev->bpf.progs[type]);
+	if (type == HID_BPF_PROG_TYPE_OFFLOAD) {
+		/*
+		 * HID_BPF_PROG_TYPE_OFFLOAD can sleep, so we can not
+		 * take an rcu_read_lock()
+		 * Prevent concurrency by taking &hid_bpf_attach_lock
+		 * instead
+		 */
+		mutex_lock(&hid_bpf_attach_lock);
+		prog_list = hdev->bpf.progs[type];
+	} else {
+		rcu_read_lock();
+		prog_list = rcu_dereference(hdev->bpf.progs[type]);
+	}
 
 	if (!prog_list)
 		goto out_unlock;
@@ -123,7 +142,10 @@ int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
 			continue;
 
 		ctx_kern->ctx.index = idx;
-		err = __hid_bpf_tail_call(&ctx_kern->ctx);
+		if (type == HID_BPF_PROG_TYPE_OFFLOAD)
+			err = __hid_bpf_tail_call_sleepable(&ctx_kern->ctx);
+		else
+			err = __hid_bpf_tail_call(&ctx_kern->ctx);
 		if (err < 0)
 			break;
 		if (err)
@@ -131,7 +153,10 @@ int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
 	}
 
  out_unlock:
-	rcu_read_unlock();
+	if (type == HID_BPF_PROG_TYPE_OFFLOAD)
+		mutex_unlock(&hid_bpf_attach_lock);
+	else
+		rcu_read_unlock();
 
 	return err;
 }
@@ -557,6 +582,7 @@ int hid_bpf_preload_skel(void)
 	}
 
 	ATTACH_AND_STORE_LINK(hid_tail_call);
+	ATTACH_AND_STORE_LINK(hid_tail_call_sleepable);
 
 	return 0;
 out:
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index 17b08f500098..87e72ffadff0 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -5,6 +5,7 @@
 
 #include <linux/bpf.h>
 #include <linux/spinlock.h>
+#include <linux/workqueue.h>
 #include <uapi/linux/hid.h>
 
 struct hid_device;
@@ -76,6 +77,7 @@ enum hid_bpf_attach_flags {
 /* Following functions are tracepoints that BPF programs can attach to */
 int hid_bpf_device_event(struct hid_bpf_ctx *ctx);
 int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx);
+int hid_bpf_offload(struct hid_bpf_ctx *ctx);
 
 /*
  * Below is HID internal
@@ -83,6 +85,7 @@ int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx);
 
 /* internal function to call eBPF programs, not to be used by anybody */
 int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx);
+int __hid_bpf_tail_call_sleepable(struct hid_bpf_ctx *ctx);
 
 #define HID_BPF_MAX_PROGS_PER_DEV 64
 #define HID_BPF_FLAG_MASK (((HID_BPF_FLAG_MAX - 1) << 1) - 1)
@@ -92,6 +95,7 @@ enum hid_bpf_prog_type {
 	HID_BPF_PROG_TYPE_UNDEF = -1,
 	HID_BPF_PROG_TYPE_DEVICE_EVENT,			/* an event is emitted from the device */
 	HID_BPF_PROG_TYPE_RDESC_FIXUP,
+	HID_BPF_PROG_TYPE_OFFLOAD,
 	HID_BPF_PROG_TYPE_MAX,
 };
 
@@ -129,6 +133,9 @@ struct hid_bpf {
 	bool destroyed;			/* prevents the assignment of any progs */
 
 	spinlock_t progs_lock;		/* protects RCU update of progs */
+
+	struct delayed_work work;
+	bool work_initialized;
 };
 
 /* specific HID-BPF link when a program is attached to a device */

-- 
2.43.0