HID: bpf: remove tracing HID-BPF capability

We can now rely on struct_ops as we cleared the users in-tree.

Link: https://lore.kernel.org/r/20240608-hid_bpf_struct_ops-v3-8-6ac6ade58329@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>

1 files changed, 1 insertions, 53 deletions

diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index c4f4ce10b7dd..447b94aa99ab 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -4,7 +4,7 @@
 #define __HID_BPF_H
 
 #include <linux/bpf.h>
-#include <linux/spinlock.h>
+#include <linux/mutex.h>
 #include <uapi/linux/hid.h>
 
 struct hid_device;
@@ -24,11 +24,7 @@ struct hid_device;
  *
  * All of these fields are currently read-only.
  *
- * @index: program index in the jump table. No special meaning (a smaller index
- *         doesn't mean the program will be executed before another program with
- *         a bigger index).
  * @hid: the ``struct hid_device`` representing the device itself
- * @report_type: used for ``hid_bpf_device_event()``
  * @allocated_size: Allocated size of data.
  *
  *                  This is how much memory is available and can be requested
@@ -47,54 +43,21 @@ struct hid_device;
  * @retval: Return value of the previous program.
  */
 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;
 	};
 };
 
-/**
- * enum hid_bpf_attach_flags - flags used when attaching a HIF-BPF program
- *
- * @HID_BPF_FLAG_NONE: no specific flag is used, the kernel choses where to
- *                     insert the program
- * @HID_BPF_FLAG_INSERT_HEAD: insert the given program before any other program
- *                            currently attached to the device. This doesn't
- *                            guarantee that this program will always be first
- */
-enum hid_bpf_attach_flags {
-	HID_BPF_FLAG_NONE = 0,
-	HID_BPF_FLAG_INSERT_HEAD = _BITUL(0),
-
-	/* private: internal use only */
-	HID_BPF_FLAG_MAX,
-};
-
-/* 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);
-
 /*
  * Below is HID internal
  */
 
-/* internal function to call eBPF programs, not to be used by anybody */
-int __hid_bpf_tail_call(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)
 
-/* types of HID programs to attach to */
-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_MAX,
-};
 
 struct hid_report_enum;
 
@@ -167,11 +130,6 @@ struct hid_bpf_ops {
 	struct hid_device *hdev;
 };
 
-struct hid_bpf_prog_list {
-	u16 prog_idx[HID_BPF_MAX_PROGS_PER_DEV];
-	u8 prog_cnt;
-};
-
 /* stored in each device */
 struct hid_bpf {
 	u8 *device_data;		/* allocated when a bpf program of type
@@ -179,23 +137,13 @@ struct hid_bpf {
 					 * to this HID device
 					 */
 	u32 allocated_data;
-
-	struct hid_bpf_prog_list __rcu *progs[HID_BPF_PROG_TYPE_MAX];	/* attached BPF progs */
 	bool destroyed;			/* prevents the assignment of any progs */
 
-	spinlock_t progs_lock;		/* protects RCU update of progs */
-
 	struct hid_bpf_ops *rdesc_ops;
 	struct list_head prog_list;
 	struct mutex prog_list_lock;	/* protects prog_list update */
 };
 
-/* specific HID-BPF link when a program is attached to a device */
-struct hid_bpf_link {
-	struct bpf_link link;
-	int hid_table_index;
-};
-
 #ifdef CONFIG_HID_BPF
 u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data,
 				  u32 *size, int interrupt);