1 // SPDX-License-Identifier: GPL-2.0
24 static int efi_reset_type = -1;
33  * efi_capsule_pending - has a capsule been passed to the firmware?
34  * @reset_type: store the type of EFI reset if capsule is pending
37  * firmware we need to perform a specific type of reset. If a capsule is
38  * pending return the reset type in @reset_type.
40  * This function will race with callers of efi_capsule_update(), for
46  * A non-racy use is from platform reboot code because we use
62  * Whitelist of EFI capsule flags that we support.
73  * efi_capsule_supported - does the firmware support the capsule?
74  * @guid: vendor guid of capsule
76  * @size: size of capsule data
77  * @reset: the reset type required for this capsule
82  * No attempt is made to check @reset against the reset type required
83  * by any pending capsules because of the races involved.
85 int efi_capsule_supported(efi_guid_t guid, u32 flags, size_t size, int *reset)  in efi_capsule_supported()  argument
93 		return -EINVAL;  in efi_capsule_supported()
99 	status = efi.query_capsule_caps(cap_list, 1, &max_size, reset);  in efi_capsule_supported()
104 		return -ENOSPC;  in efi_capsule_supported()
112  * continuation pointer. The last continuation pointer of the last
113  * page must be zero to mark the end of the chain.
115 #define SGLIST_PER_PAGE	((PAGE_SIZE / sizeof(efi_capsule_block_desc_t)) - 1)
127  * efi_capsule_update_locked - pass a single capsule to the firmware
129  * @sg_pages: array of scatter gather (block descriptor) pages
130  * @reset: the reset type required for @capsule
133  * whether efi_reset_type will conflict with @reset, and atomically
143 			  struct page **sg_pages, int reset)  in efi_capsule_update_locked()  argument
152 	 * different reset type, we're out of luck and must abort.  in efi_capsule_update_locked()
154 	if (efi_reset_type >= 0 && efi_reset_type != reset) {  in efi_capsule_update_locked()
155 		pr_err("Conflicting capsule reset type %d (%d).\n",  in efi_capsule_update_locked()
156 		       reset, efi_reset_type);  in efi_capsule_update_locked()
157 		return -EINVAL;  in efi_capsule_update_locked()
168 		return -EINVAL;  in efi_capsule_update_locked()
176 		efi_reset_type = reset;  in efi_capsule_update_locked()
183  * efi_capsule_update - send a capsule to the firmware
185  * @pages: an array of capsule data pages
191  * @capsule must be a virtual mapping of the complete capsule update in the
193  * A capsule_header_t that describes the entire contents of the capsule
194  * must be at the start of the first data page.
208  * pending capsule that has a reset type that conflicts with the one
217 	u32 imagesize = capsule->imagesize;  in efi_capsule_update()
218 	efi_guid_t guid = capsule->guid;  in efi_capsule_update()
220 	u32 flags = capsule->flags;  in efi_capsule_update()
234 		return -ENOMEM;  in efi_capsule_update()
239 			rv = -ENOMEM;  in efi_capsule_update()
240 			goto out;  in efi_capsule_update()
251 				       PAGE_SIZE - (u64)*pages % PAGE_SIZE);  in efi_capsule_update()
256 			imagesize -= sz;  in efi_capsule_update()
257 			count--;  in efi_capsule_update()
275 out:  in efi_capsule_update()