Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) // bpf-lirc.c - handles bpf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) //
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) // Copyright (C) 2018 Sean Young <sean@mess.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/bpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/filter.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/bpf_lirc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include "rc-core-priv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #define lirc_rcu_dereference(p)						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 	rcu_dereference_protected(p, lockdep_is_held(&ir_raw_handler_lock))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  * BPF interface for raw IR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) const struct bpf_prog_ops lirc_mode2_prog_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) BPF_CALL_1(bpf_rc_repeat, u32*, sample)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	struct ir_raw_event_ctrl *ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	ctrl = container_of(sample, struct ir_raw_event_ctrl, bpf_sample);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	rc_repeat(ctrl->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static const struct bpf_func_proto rc_repeat_proto = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	.func	   = bpf_rc_repeat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	.gpl_only  = true, /* rc_repeat is EXPORT_SYMBOL_GPL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	.ret_type  = RET_INTEGER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	.arg1_type = ARG_PTR_TO_CTX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) BPF_CALL_4(bpf_rc_keydown, u32*, sample, u32, protocol, u64, scancode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	   u32, toggle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	struct ir_raw_event_ctrl *ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	ctrl = container_of(sample, struct ir_raw_event_ctrl, bpf_sample);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	rc_keydown(ctrl->dev, protocol, scancode, toggle != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static const struct bpf_func_proto rc_keydown_proto = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	.func	   = bpf_rc_keydown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	.gpl_only  = true, /* rc_keydown is EXPORT_SYMBOL_GPL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	.ret_type  = RET_INTEGER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	.arg1_type = ARG_PTR_TO_CTX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	.arg2_type = ARG_ANYTHING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	.arg3_type = ARG_ANYTHING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	.arg4_type = ARG_ANYTHING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) BPF_CALL_3(bpf_rc_pointer_rel, u32*, sample, s32, rel_x, s32, rel_y)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	struct ir_raw_event_ctrl *ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	ctrl = container_of(sample, struct ir_raw_event_ctrl, bpf_sample);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	input_report_rel(ctrl->dev->input_dev, REL_X, rel_x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	input_report_rel(ctrl->dev->input_dev, REL_Y, rel_y);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	input_sync(ctrl->dev->input_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) static const struct bpf_func_proto rc_pointer_rel_proto = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	.func	   = bpf_rc_pointer_rel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	.gpl_only  = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	.ret_type  = RET_INTEGER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	.arg1_type = ARG_PTR_TO_CTX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	.arg2_type = ARG_ANYTHING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	.arg3_type = ARG_ANYTHING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) static const struct bpf_func_proto *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) lirc_mode2_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	switch (func_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	case BPF_FUNC_rc_repeat:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		return &rc_repeat_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	case BPF_FUNC_rc_keydown:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		return &rc_keydown_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	case BPF_FUNC_rc_pointer_rel:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		return &rc_pointer_rel_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	case BPF_FUNC_map_lookup_elem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		return &bpf_map_lookup_elem_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	case BPF_FUNC_map_update_elem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		return &bpf_map_update_elem_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	case BPF_FUNC_map_delete_elem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		return &bpf_map_delete_elem_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	case BPF_FUNC_map_push_elem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		return &bpf_map_push_elem_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	case BPF_FUNC_map_pop_elem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		return &bpf_map_pop_elem_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	case BPF_FUNC_map_peek_elem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		return &bpf_map_peek_elem_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	case BPF_FUNC_ktime_get_ns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		return &bpf_ktime_get_ns_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	case BPF_FUNC_ktime_get_boot_ns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		return &bpf_ktime_get_boot_ns_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	case BPF_FUNC_tail_call:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		return &bpf_tail_call_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	case BPF_FUNC_get_prandom_u32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		return &bpf_get_prandom_u32_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	case BPF_FUNC_trace_printk:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		if (perfmon_capable())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 			return bpf_get_trace_printk_proto();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static bool lirc_mode2_is_valid_access(int off, int size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 				       enum bpf_access_type type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 				       const struct bpf_prog *prog,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 				       struct bpf_insn_access_aux *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	/* We have one field of u32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	return type == BPF_READ && off == 0 && size == sizeof(u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) const struct bpf_verifier_ops lirc_mode2_verifier_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	.get_func_proto  = lirc_mode2_func_proto,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	.is_valid_access = lirc_mode2_is_valid_access
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) #define BPF_MAX_PROGS 64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static int lirc_bpf_attach(struct rc_dev *rcdev, struct bpf_prog *prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	struct bpf_prog_array *old_array;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	struct bpf_prog_array *new_array;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	struct ir_raw_event_ctrl *raw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	if (rcdev->driver_type != RC_DRIVER_IR_RAW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	ret = mutex_lock_interruptible(&ir_raw_handler_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	raw = rcdev->raw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (!raw) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	old_array = lirc_rcu_dereference(raw->progs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if (old_array && bpf_prog_array_length(old_array) >= BPF_MAX_PROGS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		ret = -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	ret = bpf_prog_array_copy(old_array, NULL, prog, &new_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	rcu_assign_pointer(raw->progs, new_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	bpf_prog_array_free(old_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	mutex_unlock(&ir_raw_handler_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static int lirc_bpf_detach(struct rc_dev *rcdev, struct bpf_prog *prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	struct bpf_prog_array *old_array;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	struct bpf_prog_array *new_array;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	struct ir_raw_event_ctrl *raw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	if (rcdev->driver_type != RC_DRIVER_IR_RAW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	ret = mutex_lock_interruptible(&ir_raw_handler_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	raw = rcdev->raw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (!raw) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	old_array = lirc_rcu_dereference(raw->progs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	ret = bpf_prog_array_copy(old_array, prog, NULL, &new_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	 * Do not use bpf_prog_array_delete_safe() as we would end up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	 * with a dummy entry in the array, and the we would free the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	 * dummy in lirc_bpf_free()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	rcu_assign_pointer(raw->progs, new_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	bpf_prog_array_free(old_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	bpf_prog_put(prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	mutex_unlock(&ir_raw_handler_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) void lirc_bpf_run(struct rc_dev *rcdev, u32 sample)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	struct ir_raw_event_ctrl *raw = rcdev->raw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	raw->bpf_sample = sample;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (raw->progs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		BPF_PROG_RUN_ARRAY(raw->progs, &raw->bpf_sample, BPF_PROG_RUN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)  * This should be called once the rc thread has been stopped, so there can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)  * no concurrent bpf execution.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)  * Should be called with the ir_raw_handler_lock held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) void lirc_bpf_free(struct rc_dev *rcdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	struct bpf_prog_array_item *item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	struct bpf_prog_array *array;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	array = lirc_rcu_dereference(rcdev->raw->progs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	if (!array)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	for (item = array->items; item->prog; item++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		bpf_prog_put(item->prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	bpf_prog_array_free(array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) int lirc_prog_attach(const union bpf_attr *attr, struct bpf_prog *prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	struct rc_dev *rcdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (attr->attach_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	rcdev = rc_dev_get_from_fd(attr->target_fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	if (IS_ERR(rcdev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		return PTR_ERR(rcdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	ret = lirc_bpf_attach(rcdev, prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	put_device(&rcdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) int lirc_prog_detach(const union bpf_attr *attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	struct bpf_prog *prog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	struct rc_dev *rcdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	if (attr->attach_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	prog = bpf_prog_get_type(attr->attach_bpf_fd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 				 BPF_PROG_TYPE_LIRC_MODE2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	if (IS_ERR(prog))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		return PTR_ERR(prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	rcdev = rc_dev_get_from_fd(attr->target_fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	if (IS_ERR(rcdev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		bpf_prog_put(prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		return PTR_ERR(rcdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	ret = lirc_bpf_detach(rcdev, prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	bpf_prog_put(prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	put_device(&rcdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) int lirc_prog_query(const union bpf_attr *attr, union bpf_attr __user *uattr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	__u32 __user *prog_ids = u64_to_user_ptr(attr->query.prog_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	struct bpf_prog_array *progs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	struct rc_dev *rcdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	u32 cnt, flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	if (attr->query.query_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	rcdev = rc_dev_get_from_fd(attr->query.target_fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if (IS_ERR(rcdev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		return PTR_ERR(rcdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	if (rcdev->driver_type != RC_DRIVER_IR_RAW) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		goto put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	ret = mutex_lock_interruptible(&ir_raw_handler_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		goto put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	progs = lirc_rcu_dereference(rcdev->raw->progs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	cnt = progs ? bpf_prog_array_length(progs) : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	if (copy_to_user(&uattr->query.prog_cnt, &cnt, sizeof(cnt))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	if (copy_to_user(&uattr->query.attach_flags, &flags, sizeof(flags))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	if (attr->query.prog_cnt != 0 && prog_ids && cnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		ret = bpf_prog_array_copy_to_user(progs, prog_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 						  attr->query.prog_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	mutex_unlock(&ir_raw_handler_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	put_device(&rcdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) }