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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Provide kernel BTF information for introspection and use by eBPF tools.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/kobject.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) /* See scripts/link-vmlinux.sh, gen_btf() func for details */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) extern char __weak __start_BTF[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) extern char __weak __stop_BTF[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) btf_vmlinux_read(struct file *file, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 		 struct bin_attribute *bin_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 		 char *buf, loff_t off, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	memcpy(buf, __start_BTF + off, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static struct bin_attribute bin_attr_btf_vmlinux __ro_after_init = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	.attr = { .name = "vmlinux", .mode = 0444, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	.read = btf_vmlinux_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static struct kobject *btf_kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static int __init btf_vmlinux_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	bin_attr_btf_vmlinux.size = __stop_BTF - __start_BTF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	if (!__start_BTF || bin_attr_btf_vmlinux.size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	btf_kobj = kobject_create_and_add("btf", kernel_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	if (!btf_kobj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	return sysfs_create_bin_file(btf_kobj, &bin_attr_btf_vmlinux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) subsys_initcall(btf_vmlinux_init);