modify sin led gpio

hc

2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e

 kernel/drivers/media/rc/bpf-lirc.c
..
..
@@ -8,6 +8,9 @@
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8
 #include <linux/bpf_lirc.h>
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 #include "rc-core-priv.h"
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10
 
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+#define lirc_rcu_dereference(p)						\
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+	rcu_dereference_protected(p, lockdep_is_held(&ir_raw_handler_lock))
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+
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 /*
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  * BPF interface for raw IR
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  */
..
..
@@ -32,11 +35,6 @@
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 	.arg1_type = ARG_PTR_TO_CTX,
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 };
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37
 
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-/*
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- * Currently rc-core does not support 64-bit scancodes, but there are many
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- * known protocols with more than 32 bits. So, define the interface as u64
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- * as a future-proof.
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- */
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 BPF_CALL_4(bpf_rc_keydown, u32*, sample, u32, protocol, u64, scancode,
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 	   u32, toggle)
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 {
..
..
@@ -59,6 +57,28 @@
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 	.arg4_type = ARG_ANYTHING,
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 };
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59
 
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+BPF_CALL_3(bpf_rc_pointer_rel, u32*, sample, s32, rel_x, s32, rel_y)
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+{
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+	struct ir_raw_event_ctrl *ctrl;
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+
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+	ctrl = container_of(sample, struct ir_raw_event_ctrl, bpf_sample);
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+
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+	input_report_rel(ctrl->dev->input_dev, REL_X, rel_x);
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+	input_report_rel(ctrl->dev->input_dev, REL_Y, rel_y);
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+	input_sync(ctrl->dev->input_dev);
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+
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+	return 0;
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+}
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+
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+static const struct bpf_func_proto rc_pointer_rel_proto = {
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+	.func	   = bpf_rc_pointer_rel,
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+	.gpl_only  = true,
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+	.ret_type  = RET_INTEGER,
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+	.arg1_type = ARG_PTR_TO_CTX,
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+	.arg2_type = ARG_ANYTHING,
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+	.arg3_type = ARG_ANYTHING,
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+};
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+
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 static const struct bpf_func_proto *
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 lirc_mode2_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
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 {
..
..
@@ -67,12 +87,20 @@
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 		return &rc_repeat_proto;
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 	case BPF_FUNC_rc_keydown:
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 		return &rc_keydown_proto;
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+	case BPF_FUNC_rc_pointer_rel:
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+		return &rc_pointer_rel_proto;
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 	case BPF_FUNC_map_lookup_elem:
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 		return &bpf_map_lookup_elem_proto;
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 	case BPF_FUNC_map_update_elem:
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 		return &bpf_map_update_elem_proto;
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 	case BPF_FUNC_map_delete_elem:
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 		return &bpf_map_delete_elem_proto;
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+	case BPF_FUNC_map_push_elem:
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+		return &bpf_map_push_elem_proto;
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+	case BPF_FUNC_map_pop_elem:
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+		return &bpf_map_pop_elem_proto;
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+	case BPF_FUNC_map_peek_elem:
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+		return &bpf_map_peek_elem_proto;
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 	case BPF_FUNC_ktime_get_ns:
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 		return &bpf_ktime_get_ns_proto;
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 	case BPF_FUNC_ktime_get_boot_ns:
..
..
@@ -82,9 +110,9 @@
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 	case BPF_FUNC_get_prandom_u32:
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 		return &bpf_get_prandom_u32_proto;
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 	case BPF_FUNC_trace_printk:
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-		if (capable(CAP_SYS_ADMIN))
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+		if (perfmon_capable())
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 			return bpf_get_trace_printk_proto();
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-		/* fall through */
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+		fallthrough;
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 	default:
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 		return NULL;
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 	}
..
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@@ -108,7 +136,7 @@
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136
 
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 static int lirc_bpf_attach(struct rc_dev *rcdev, struct bpf_prog *prog)
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 {
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-	struct bpf_prog_array __rcu *old_array;
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+	struct bpf_prog_array *old_array;
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 	struct bpf_prog_array *new_array;
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 	struct ir_raw_event_ctrl *raw;
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 	int ret;
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@@ -126,12 +154,12 @@
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 		goto unlock;
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 	}
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-	if (raw->progs && bpf_prog_array_length(raw->progs) >= BPF_MAX_PROGS) {
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+	old_array = lirc_rcu_dereference(raw->progs);
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+	if (old_array && bpf_prog_array_length(old_array) >= BPF_MAX_PROGS) {
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 		ret = -E2BIG;
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 		goto unlock;
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 	}
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162
 
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-	old_array = raw->progs;
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 	ret = bpf_prog_array_copy(old_array, NULL, prog, &new_array);
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 	if (ret < 0)
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 		goto unlock;
..
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@@ -146,7 +174,7 @@
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174
 
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 static int lirc_bpf_detach(struct rc_dev *rcdev, struct bpf_prog *prog)
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 {
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-	struct bpf_prog_array __rcu *old_array;
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+	struct bpf_prog_array *old_array;
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 	struct bpf_prog_array *new_array;
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 	struct ir_raw_event_ctrl *raw;
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 	int ret;
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@@ -164,7 +192,7 @@
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 		goto unlock;
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 	}
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194
 
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-	old_array = raw->progs;
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+	old_array = lirc_rcu_dereference(raw->progs);
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 	ret = bpf_prog_array_copy(old_array, prog, NULL, &new_array);
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 	/*
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 	 * Do not use bpf_prog_array_delete_safe() as we would end up
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@@ -195,21 +223,22 @@
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 /*
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  * This should be called once the rc thread has been stopped, so there can be
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  * no concurrent bpf execution.
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+ *
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+ * Should be called with the ir_raw_handler_lock held.
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  */
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 void lirc_bpf_free(struct rc_dev *rcdev)
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 {
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 	struct bpf_prog_array_item *item;
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+	struct bpf_prog_array *array;
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-	if (!rcdev->raw->progs)
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+	array = lirc_rcu_dereference(rcdev->raw->progs);
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+	if (!array)
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 		return;
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-	item = rcu_dereference(rcdev->raw->progs)->items;
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-	while (item->prog) {
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+	for (item = array->items; item->prog; item++)
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 		bpf_prog_put(item->prog);
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-		item++;
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-	}
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240
 
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-	bpf_prog_array_free(rcdev->raw->progs);
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+	bpf_prog_array_free(array);
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 }
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243
 
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 int lirc_prog_attach(const union bpf_attr *attr, struct bpf_prog *prog)
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@@ -262,7 +291,7 @@
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 int lirc_prog_query(const union bpf_attr *attr, union bpf_attr __user *uattr)
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 {
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 	__u32 __user *prog_ids = u64_to_user_ptr(attr->query.prog_ids);
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-	struct bpf_prog_array __rcu *progs;
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+	struct bpf_prog_array *progs;
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 	struct rc_dev *rcdev;
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 	u32 cnt, flags = 0;
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 	int ret;
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@@ -283,7 +312,7 @@
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 	if (ret)
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 		goto put;
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314
 
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-	progs = rcdev->raw->progs;
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+	progs = lirc_rcu_dereference(rcdev->raw->progs);
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 	cnt = progs ? bpf_prog_array_length(progs) : 0;
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317
 
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 	if (copy_to_user(&uattr->query.prog_cnt, &cnt, sizeof(cnt))) {