1 // SPDX-License-Identifier: GPL-2.0
25 static int efi_reset_type = -1;
34  * efi_capsule_pending - has a capsule been passed to the firmware?
35  * @reset_type: store the type of EFI reset if capsule is pending
38  * firmware we need to perform a specific type of reset. If a capsule is
39  * pending return the reset type in @reset_type.
41  * This function will race with callers of efi_capsule_update(), for
47  * A non-racy use is from platform reboot code because we use
63  * Whitelist of EFI capsule flags that we support.
74  * efi_capsule_supported - does the firmware support the capsule?
75  * @guid: vendor guid of capsule
77  * @size: size of capsule data
78  * @reset: the reset type required for this capsule
83  * No attempt is made to check @reset against the reset type required
84  * by any pending capsules because of the races involved.
86 int efi_capsule_supported(efi_guid_t guid, u32 flags, size_t size, int *reset)  in efi_capsule_supported()  argument
94 		return -EINVAL;  in efi_capsule_supported()
100 	status = efi.query_capsule_caps(cap_list, 1, &max_size, reset);  in efi_capsule_supported()
105 		return -ENOSPC;  in efi_capsule_supported()
113  * continuation pointer. The last continuation pointer of the last
114  * page must be zero to mark the end of the chain.
116 #define SGLIST_PER_PAGE	((PAGE_SIZE / sizeof(efi_capsule_block_desc_t)) - 1)
128  * efi_capsule_update_locked - pass a single capsule to the firmware
130  * @sg_pages: array of scatter gather (block descriptor) pages
131  * @reset: the reset type required for @capsule
134  * whether efi_reset_type will conflict with @reset, and atomically
144 			  struct page **sg_pages, int reset)  in efi_capsule_update_locked()  argument
153 	 * different reset type, we're out of luck and must abort.  in efi_capsule_update_locked()
155 	if (efi_reset_type >= 0 && efi_reset_type != reset) {  in efi_capsule_update_locked()
156 		pr_err("Conflicting capsule reset type %d (%d).\n",  in efi_capsule_update_locked()
157 		       reset, efi_reset_type);  in efi_capsule_update_locked()
158 		return -EINVAL;  in efi_capsule_update_locked()
169 		return -EINVAL;  in efi_capsule_update_locked()
177 		efi_reset_type = reset;  in efi_capsule_update_locked()
184  * efi_capsule_update - send a capsule to the firmware
186  * @pages: an array of capsule data pages
192  * @capsule must be a virtual mapping of the complete capsule update in the
194  * A capsule_header_t that describes the entire contents of the capsule
195  * must be at the start of the first data page.
209  * pending capsule that has a reset type that conflicts with the one
218 	u32 imagesize = capsule->imagesize;  in efi_capsule_update()
219 	efi_guid_t guid = capsule->guid;  in efi_capsule_update()
221 	u32 flags = capsule->flags;  in efi_capsule_update()
235 		return -ENOMEM;  in efi_capsule_update()
240 			rv = -ENOMEM;  in efi_capsule_update()
241 			goto out;  in efi_capsule_update()
252 				       PAGE_SIZE - (u64)*pages % PAGE_SIZE);  in efi_capsule_update()
257 			imagesize -= sz;  in efi_capsule_update()
258 			count--;  in efi_capsule_update()
271 		 * At runtime, the firmware has no way to find out where the  in efi_capsule_update()
287 out:  in efi_capsule_update()