1 // SPDX-License-Identifier: GPL-2.0-only
7  * Ubuntu project, hibernation support for mach-dove
11  *  https://lists.linux-foundation.org/pipermail/linux-pm/2010-June/027422.html
57 /* hyp-stub vectors, used to restore el2 during resume from hibernate. */
61  * The logical cpu number we should resume on, initialised to a non-cpu
64 static int sleep_cpu = -EINVAL;
85 	 * re-configure el2.
95 	memcpy(i->uts_version, init_utsname()->version, sizeof(i->uts_version));  in arch_hdr_invariants()
101 	unsigned long nosave_end_pfn = sym_to_pfn(&__nosave_end - 1);  in pfn_is_nosave()
121 		return -EOVERFLOW;  in arch_hibernation_header_save()
123 	arch_hdr_invariants(&hdr->invariants);  in arch_hibernation_header_save()
124 	hdr->ttbr1_el1		= __pa_symbol(swapper_pg_dir);  in arch_hibernation_header_save()
125 	hdr->reenter_kernel	= _cpu_resume;  in arch_hibernation_header_save()
129 		hdr->__hyp_stub_vectors = __pa_symbol(__hyp_stub_vectors);  in arch_hibernation_header_save()
131 		hdr->__hyp_stub_vectors = 0;  in arch_hibernation_header_save()
136 		return -ENODEV;  in arch_hibernation_header_save()
138 	hdr->sleep_cpu_mpidr = cpu_logical_map(sleep_cpu);  in arch_hibernation_header_save()
140 		hdr->sleep_cpu_mpidr);  in arch_hibernation_header_save()
153 	if (memcmp(&hdr->invariants, &invariants, sizeof(invariants))) {  in arch_hibernation_header_restore()
155 		return -EINVAL;  in arch_hibernation_header_restore()
158 	sleep_cpu = get_logical_index(hdr->sleep_cpu_mpidr);  in arch_hibernation_header_restore()
160 		hdr->sleep_cpu_mpidr);  in arch_hibernation_header_restore()
163 		sleep_cpu = -EINVAL;  in arch_hibernation_header_restore()
164 		return -EINVAL;  in arch_hibernation_header_restore()
169 		sleep_cpu = -EINVAL;  in arch_hibernation_header_restore()
210 		return -ENOMEM;  in create_safe_exec_page()
223 	 * For a real hibernate/resume cycle TTBR0 currently points to a zero  in create_safe_exec_page()
224 	 * page, but TLBs may contain stale ASID-tagged entries (e.g. for EFI  in create_safe_exec_page()
225 	 * runtime services), while for a userspace-driven test_resume cycle it  in create_safe_exec_page()
226 	 * points to userspace page tables (and we must point it at a zero page  in create_safe_exec_page()
253 		return -ENOMEM;  in save_tags()
294 		for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) {  in swsusp_mte_save_tags()
300 			if (!test_bit(PG_mte_tagged, &page->flags))  in swsusp_mte_save_tags()
331 		 * at this point since the tags stored in page->flags are  in swsusp_mte_restore_tags()
367 		return -EBUSY;  in swsusp_arch_suspend()
409 		sleep_cpu = -EINVAL;  in swsusp_arch_suspend()
455 	 * We need a zero page that is zero before & after resume in order to  in swsusp_arch_resume()
460 		pr_err("Failed to allocate zero page.\n");  in swsusp_arch_resume()
461 		return -ENOMEM;  in swsusp_arch_resume()
464 	exit_size = __hibernate_exit_text_end - __hibernate_exit_text_start;  in swsusp_arch_resume()
478 	 * be executed at el2 with the mmu off in order to reload hyp-stub.  in swsusp_arch_resume()
491 		el2_vectors += hibernate_el2_vectors -  in swsusp_arch_resume()
508 		return -ENODEV;  in hibernate_resume_nonboot_cpu_disable()