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ceb1813224
Currently one requires to test four kernel configurations to test the firmware API completely: 0) CONFIG_FW_LOADER=y 1) o CONFIG_FW_LOADER=y o CONFIG_FW_LOADER_USER_HELPER=y 2) o CONFIG_FW_LOADER=y o CONFIG_FW_LOADER_USER_HELPER=y o CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y 3) When CONFIG_FW_LOADER=m the built-in stuff is disabled, we have no current tests for this. We can reduce the requirements to three kernel configurations by making fw_config.force_sysfs_fallback a proc knob we flip on off. For kernels that disable CONFIG_IKCONFIG_PROC this can also enable one to inspect if CONFIG_FW_LOADER_USER_HELPER_FALLBACK was enabled at build time by checking the proc value at boot time. Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __FIRMWARE_FALLBACK_H
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#define __FIRMWARE_FALLBACK_H
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#include <linux/firmware.h>
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#include <linux/device.h>
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/**
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* struct firmware_fallback_config - firmware fallback configuratioon settings
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*
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* Helps describe and fine tune the fallback mechanism.
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*
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* @force_sysfs_fallback: force the sysfs fallback mechanism to be used
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* as if one had enabled CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y.
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* Useful to help debug a CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y
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* functionality on a kernel where that config entry has been disabled.
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* @old_timeout: for internal use
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* @loading_timeout: the timeout to wait for the fallback mechanism before
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* giving up, in seconds.
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*/
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struct firmware_fallback_config {
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unsigned int force_sysfs_fallback;
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int old_timeout;
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int loading_timeout;
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};
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#ifdef CONFIG_FW_LOADER_USER_HELPER
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int fw_sysfs_fallback(struct firmware *fw, const char *name,
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struct device *device,
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unsigned int opt_flags,
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int ret);
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void kill_pending_fw_fallback_reqs(bool only_kill_custom);
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void fw_fallback_set_cache_timeout(void);
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void fw_fallback_set_default_timeout(void);
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int register_sysfs_loader(void);
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void unregister_sysfs_loader(void);
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#else /* CONFIG_FW_LOADER_USER_HELPER */
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static inline int fw_sysfs_fallback(struct firmware *fw, const char *name,
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struct device *device,
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unsigned int opt_flags,
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int ret)
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{
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/* Keep carrying over the same error */
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return ret;
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}
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static inline void kill_pending_fw_fallback_reqs(bool only_kill_custom) { }
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static inline void fw_fallback_set_cache_timeout(void) { }
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static inline void fw_fallback_set_default_timeout(void) { }
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static inline int register_sysfs_loader(void)
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{
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return 0;
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}
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static inline void unregister_sysfs_loader(void)
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{
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}
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#endif /* CONFIG_FW_LOADER_USER_HELPER */
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#endif /* __FIRMWARE_FALLBACK_H */
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