3  * main.c - Multi purpose firmware loading support
7  * Please see Documentation/driver-api/firmware/ for more information.
26 #include <linux/firmware.h>
44 #include "firmware.h"
48 MODULE_DESCRIPTION("Multi purpose firmware loading support");
59 	 * Names of firmware images which have been cached successfully
61 	 * helper can trace which firmware images have been cached
167 /* Returns 1 for batching firmware requests with the same name */
308  * ZSTD-compressed firmware support
372  * XZ-compressed firmware support
470 /* direct firmware loading support */
474 	"/lib/firmware/updates/" UTS_RELEASE,
475 	"/lib/firmware/updates",
476 	"/lib/firmware/" UTS_RELEASE,
477 	"/lib/firmware"
486 MODULE_PARM_DESC(path, "customized firmware image search path with a higher priority than default p…
543 		 * firmware was not completely loaded.  in fw_get_filesystem_firmware()
548 		/* load firmware files from the mount namespace of init */  in fw_get_filesystem_firmware()
565 		dev_dbg(device, "Loading firmware from %s\n", path);  in fw_get_filesystem_firmware()
592 /* firmware holds the ownership of pages */
593 static void firmware_free_data(const struct firmware *fw)  in firmware_free_data()
603 /* store the pages buffer info firmware from buf */
604 static void fw_set_page_data(struct fw_priv *fw_priv, struct firmware *fw)  in fw_set_page_data()
656 /* add firmware name into devres list */
691 int assign_fw(struct firmware *fw, struct device *device)  in assign_fw()
703 	 * add firmware name into devres list so that we can auto cache  in assign_fw()
704 	 * and uncache firmware for device.  in assign_fw()
709 	/* don't cache firmware handled without uevent */  in assign_fw()
720 	 * After caching firmware image is started, let it piggyback  in assign_fw()
721 	 * on request firmware.  in assign_fw()
733 /* prepare firmware and firmware_buf structs;
734  * return 0 if a firmware is already assigned, 1 if need to load one,
738 _request_firmware_prepare(struct firmware **firmware_p, const char *name,  in _request_firmware_prepare()
742 	struct firmware *firmware;  in _request_firmware_prepare()  local
746 	*firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL);  in _request_firmware_prepare()
747 	if (!firmware) {  in _request_firmware_prepare()
748 		dev_err(device, "%s: kmalloc(struct firmware) failed\n",  in _request_firmware_prepare()
753 	if (firmware_request_builtin_buf(firmware, name, dbuf, size)) {  in _request_firmware_prepare()
763 	 * of requesting firmware.  in _request_firmware_prepare()
765 	firmware->priv = fw_priv;  in _request_firmware_prepare()
770 			fw_set_page_data(fw_priv, firmware);  in _request_firmware_prepare()
789 static void fw_abort_batch_reqs(struct firmware *fw)  in fw_abort_batch_reqs()
808 static void fw_log_firmware_info(const struct firmware *fw, const char *name, struct device *device)  in fw_log_firmware_info()
843 static void fw_log_firmware_info(const struct firmware *fw, const char *name,  in fw_log_firmware_info()
850 _request_firmware(const struct firmware **firmware_p, const char *name,  in _request_firmware()
854 	struct firmware *fw = NULL;  in _request_firmware()
874 	 * We are about to try to access the firmware file. Because we may have been  in _request_firmware()
907 				 "Direct firmware load for %s failed with error %d\n",  in _request_firmware()
932  * request_firmware() - send firmware request and wait for it
933  * @firmware_p: pointer to firmware image
934  * @name: name of firmware file
935  * @device: device for which firmware is being loaded
937  *      @firmware_p will be used to return a firmware image by the name
942  *      @name will be used as $FIRMWARE in the uevent environment and
944  *      firmware image for this or any other device.
952 request_firmware(const struct firmware **firmware_p, const char *name,  in request_firmware()
968  * @firmware: pointer to firmware image
969  * @name: name of firmware file
970  * @device: device for which firmware is being loaded
975  * failures to find the firmware file with it are still suppressed. It is
979 int firmware_request_nowarn(const struct firmware **firmware, const char *name,  in firmware_request_nowarn()  argument
986 	ret = _request_firmware(firmware, name, device, NULL, 0, 0,  in firmware_request_nowarn()
994  * request_firmware_direct() - load firmware directly without usermode helper
995  * @firmware_p: pointer to firmware image
996  * @name: name of firmware file
997  * @device: device for which firmware is being loaded
1000  * fall back to usermode helper even if the firmware couldn't be loaded
1004 int request_firmware_direct(const struct firmware **firmware_p,  in request_firmware_direct()
1019  * firmware_request_platform() - request firmware with platform-fw fallback
1020  * @firmware: pointer to firmware image
1021  * @name: name of firmware file
1022  * @device: device for which firmware is being loaded
1026  * requested firmware embedded in the platform's main (e.g. UEFI) firmware.
1028 int firmware_request_platform(const struct firmware **firmware,  in firmware_request_platform()  argument
1035 	ret = _request_firmware(firmware, name, device, NULL, 0, 0,  in firmware_request_platform()
1043  * firmware_request_cache() - cache firmware for suspend so resume can use it
1044  * @name: name of firmware file
1045  * @device: device for which firmware should be cached for
1048  * require loading firmware on system reboot. This optimization may still
1049  * require the firmware present on resume from suspend. This routine can be
1050  * used to ensure the firmware is present on resume from suspend in these
1067  * request_firmware_into_buf() - load firmware into a previously allocated buffer
1068  * @firmware_p: pointer to firmware image
1069  * @name: name of firmware file
1070  * @device: device for which firmware is being loaded and DMA region allocated
1071  * @buf: address of buffer to load firmware into
1075  * allocate a buffer to hold the firmware data. Instead, the firmware
1079  * This function doesn't cache firmware either.
1082 request_firmware_into_buf(const struct firmware **firmware_p, const char *name,  in request_firmware_into_buf()
1099  * request_partial_firmware_into_buf() - load partial firmware into a previously allocated buffer
1100  * @firmware_p: pointer to firmware image
1101  * @name: name of firmware file
1102  * @device: device for which firmware is being loaded and DMA region allocated
1103  * @buf: address of buffer to load firmware into
1111 request_partial_firmware_into_buf(const struct firmware **firmware_p,  in request_partial_firmware_into_buf()
1130  * release_firmware() - release the resource associated with a firmware image
1131  * @fw: firmware resource to release
1133 void release_firmware(const struct firmware *fw)  in release_firmware()
1150 	void (*cont)(const struct firmware *fw, void *context);
1157 	const struct firmware *fw;  in request_firmware_work_func()
1173  * @module: module requesting the firmware
1174  * @uevent: sends uevent to copy the firmware image if this flag
1175  *	is non-zero else the firmware copy must be done manually.
1176  * @name: name of firmware file
1177  * @device: device for which firmware is being loaded
1180  *	@fw may be %NULL if firmware request fails.
1181  * @cont: function will be called asynchronously when the firmware
1189  *		  requesting firmware in their ->probe() methods, if
1198 	void (*cont)(const struct firmware *fw, void *context))  in request_firmware_nowait()
1241  * cache_firmware() - cache one firmware image in kernel memory space
1242  * @fw_name: the firmware image name
1244  * Cache firmware in kernel memory so that drivers can use it when
1245  * system isn't ready for them to request firmware image from userspace.
1247  * nowait version to get the cached firmware without any interacting
1250  * Return 0 if the firmware image has been cached successfully
1257 	const struct firmware *fw;  in cache_firmware()
1283  * uncache_firmware() - remove one cached firmware image
1284  * @fw_name: the firmware image name
1286  * Uncache one firmware image which has been cached successfully
1289  * Return 0 if the firmware cache has been removed successfully
1296 	struct firmware fw;  in uncache_firmware()
1421 		/* only one cache entry for one firmware */  in dev_cache_fw_image()
1458  * device_cache_fw_images() - cache devices' firmware
1461  * successfully before, the firmware names are recored into the
1465  * time when system is not ready to complete loading firmware.
1484 	/* wait for completion of caching firmware for all devices */  in device_cache_fw_images()
1491  * device_uncache_fw_images() - uncache devices' firmware
1529 		 * non-uevent firmware request to avoid stalling suspend.  in fw_pm_notify()
1553 /* stop caching firmware once syscore_suspend is reached */