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HID: bpf: make hid_bpf_input_report() sleep until the device is ready

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hid_bpf_input_report() is already marked to be used in sleepable context
only. So instead of hammering with timers the device to hopefully get
an available slot where the device is not sending events, we can make
that kfunc wait for the current event to be terminated before it goes in.

This allows to work with the following pseudo code:

in struct_ops/hid_device_event:
  - schedule a bpf_wq, which calls hid_bpf_input_report()
  - once this struct_ops function terminates, hid_bpf_input_report()
    immediately starts before the next event

Link: https://patch.msgid.link/20240626-hid_hw_req_bpf-v2-9-cfd60fb6c79f@kernel.org
Acked-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This commit is contained in:
Benjamin Tissoires
2024-06-26 15:46:30 +02:00
parent 3ac83fcd6e
commit fa03f398a8
3 changed files with 26 additions and 9 deletions
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3
include/linux/hid_bpf.h
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@@ -72,7 +72,8 @@ struct hid_ops {
int (*hid_hw_output_report)(struct hid_device *hdev, __u8 *buf, size_t len,
__u64 source, bool from_bpf);
int (*hid_input_report)(struct hid_device *hid, enum hid_report_type type,
u8 *data, u32 size, int interrupt, u64 source);
u8 *data, u32 size, int interrupt, u64 source,
bool lock_already_taken);
struct module *owner;
const struct bus_type *bus_type;
};