linux-kernel - [PATCH v4 7/7] HID: bpf: allow to use bpf_timer_set_sleepable

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Message-Id: <20240315-b4-hid-bpf-new-funcs-v4-7-079c282469d3@kernel.org>
Date: Fri, 15 Mar 2024 15:44:44 +0100
From: Benjamin Tissoires <bentiss@...nel.org>
To: Jiri Kosina <jikos@...nel.org>, 
 Benjamin Tissoires <benjamin.tissoires@...hat.com>, 
 Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>
Cc: Benjamin Tissoires <bentiss@...nel.org>, linux-input@...r.kernel.org, 
 linux-kernel@...r.kernel.org, bpf@...r.kernel.org, 
 linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH v4 7/7] HID: bpf: allow to use bpf_timer_set_sleepable_cb()
 in tracing callbacks.

Export the sleepable kfuncs we have on HID-BPF in tracing bpf programs,
but with the condition of being used in a sleepable context.
This allows to use the bpf_timer when used in a sleepable context
through bpf_timer_set_sleepable_cb() and initiate work from a device event.

Signed-off-by: Benjamin Tissoires <bentiss@...nel.org>

---

no changes in v4

no changes in v3

new in v2
---
 drivers/hid/bpf/hid_bpf_dispatch.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index e1a650f4a626..e27c2ffb4f60 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -544,6 +544,11 @@ __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_allocate_context, KF_ACQUIRE | KF_RET_NULL | KF_SLEEPABLE)
+BTF_ID_FLAGS(func, hid_bpf_release_context, KF_RELEASE | KF_SLEEPABLE)
+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_KFUNCS_END(hid_bpf_kfunc_ids)

 static const struct btf_kfunc_id_set hid_bpf_kfunc_set = {

-- 
2.44.0