1 // SPDX-License-Identifier: GPL-2.0
12 #include "firmware.h"
15  * firmware fallback mechanism
19  * use small loading timeout for caching devices' firmware because all these
20  * firmware images have been loaded successfully at lease once, also system is
21  * ready for completing firmware loading now. The maximum size of firmware in
57 		if (kill_all || !fw_priv->need_uevent)  in kill_pending_fw_fallback_reqs()
68  * fw_load_sysfs_fallback() - load a firmware via the sysfs fallback mechanism
69  * @fw_sysfs: firmware sysfs information for the firmware to load
72  * In charge of constructing a sysfs fallback interface for firmware loading.
77 	struct device *f_dev = &fw_sysfs->dev;  in fw_load_sysfs_fallback()
78 	struct fw_priv *fw_priv = fw_sysfs->fw_priv;  in fw_load_sysfs_fallback()
81 	if (!fw_priv->data)  in fw_load_sysfs_fallback()
82 		fw_priv->is_paged_buf = true;  in fw_load_sysfs_fallback()
95 		retval = -EINTR;  in fw_load_sysfs_fallback()
98 	list_add(&fw_priv->pending_list, &pending_fw_head);  in fw_load_sysfs_fallback()
101 	if (fw_priv->opt_flags & FW_OPT_UEVENT) {  in fw_load_sysfs_fallback()
102 		fw_priv->need_uevent = true;  in fw_load_sysfs_fallback()
104 		dev_dbg(f_dev, "firmware: requesting %s\n", fw_priv->fw_name);  in fw_load_sysfs_fallback()
105 		kobject_uevent(&fw_sysfs->dev.kobj, KOBJ_ADD);  in fw_load_sysfs_fallback()
111 	if (retval < 0 && retval != -ENOENT) {  in fw_load_sysfs_fallback()
118 		if (retval == -ERESTARTSYS)  in fw_load_sysfs_fallback()
119 			retval = -EINTR;  in fw_load_sysfs_fallback()
120 	} else if (fw_priv->is_paged_buf && !fw_priv->data)  in fw_load_sysfs_fallback()
121 		retval = -ENOMEM;  in fw_load_sysfs_fallback()
130 static int fw_load_from_user_helper(struct firmware *firmware,  in fw_load_from_user_helper()  argument
131 				    const char *name, struct device *device,  in fw_load_from_user_helper()  argument
142 			dev_dbg(device, "firmware: %s loading timed out\n",  in fw_load_from_user_helper()
143 				name);  in fw_load_from_user_helper()
144 			return -EBUSY;  in fw_load_from_user_helper()
149 			dev_err(device, "firmware: %s will not be loaded\n",  in fw_load_from_user_helper()
150 				name);  in fw_load_from_user_helper()
155 	fw_sysfs = fw_create_instance(firmware, name, device, opt_flags);  in fw_load_from_user_helper()
161 	fw_sysfs->fw_priv = firmware->priv;  in fw_load_from_user_helper()
165 		ret = assign_fw(firmware, device);  in fw_load_from_user_helper()
187 		pr_info_once("Ignoring firmware sysfs fallback due to sysctl knob\n");  in fw_run_sysfs_fallback()
194 	/* Also permit LSMs and IMA to fail firmware sysfs fallback */  in fw_run_sysfs_fallback()
203  * firmware_fallback_sysfs() - use the fallback mechanism to find firmware
204  * @fw: pointer to firmware image
205  * @name: name of firmware file to look for
206  * @device: device for which firmware is being loaded
207  * @opt_flags: options to control firmware loading behaviour, as defined by
211  * This function is called if direct lookup for the firmware failed, it enables
213  * interface. Userspace is in charge of loading the firmware through the sysfs
224 int firmware_fallback_sysfs(struct firmware *fw, const char *name,  in firmware_fallback_sysfs()  argument
234 				 name);  in firmware_fallback_sysfs()
237 				name);  in firmware_fallback_sysfs()
238 	return fw_load_from_user_helper(fw, name, device, opt_flags);  in firmware_fallback_sysfs()