1 // SPDX-License-Identifier: GPL-2.0-only
32  * The primary CPU waits a while for all secondary CPUs to enter. This is to
33  * avoid sending an IPI if the secondary CPUs are entering
36  * The secondary timeout has to be longer than the primary. Both timeouts are
48  * In case of system reset, secondary CPUs enter crash_kexec_secondary with out
69 static int crash_shutdown_cpu = -1;
118 	volatile unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */  in crash_kexec_prepare_cpus()
125 		ncpus = num_present_cpus() - 1;  in crash_kexec_prepare_cpus()
129 	 * So, wait a while for the secondary CPUs to enter for that case.  in crash_kexec_prepare_cpus()
145 	while ((atomic_read(&cpus_in_crash) < ncpus) && (--msecs > 0))  in crash_kexec_prepare_cpus()
156 		ncpus - atomic_read(&cpus_in_crash));  in crash_kexec_prepare_cpus()
159 	 * If we have a panic timeout set then we can't wait indefinitely  in crash_kexec_prepare_cpus()
168 	 * The primary CPU returns here via setjmp, and the secondary  in crash_kexec_prepare_cpus()
191 	crash_shutdown_cpu = -1;  in crash_kexec_prepare_cpus()
199  * This function will be called by secondary cpus.
210 		if (--msecs < 0) {  in crash_kexec_secondary()
227 	 * move the secondaries to us so that we can copy  in crash_kexec_prepare_cpus()
228 	 * the new kernel 0-0x100 safely  in crash_kexec_prepare_cpus()
256 		while (paca_ptrs[i]->kexec_state < KEXEC_STATE_REAL_MODE) {  in crash_kexec_wait_realmode()
260 			msecs--;  in crash_kexec_wait_realmode()
298  * can't reset your device in the second kernel.
338 		for (; i < (CRASH_HANDLER_MAX - 1); i++)  in crash_shutdown_unregister()
392 	crash_shutdown_cpu = -1;  in default_machine_crash_shutdown()
420  * update_crash_elfcorehdr() - Recreate the elfcorehdr and replace it with old
433 	ksegment = &image->segment[image->elfcorehdr_index];  in update_crash_elfcorehdr()
434 	mem = (void *) ksegment->mem;  in update_crash_elfcorehdr()
435 	memsz = ksegment->memsz;  in update_crash_elfcorehdr()
447 	if (image->hp_action == KEXEC_CRASH_HP_REMOVE_MEMORY) {  in update_crash_elfcorehdr()
448 		base_addr = PFN_PHYS(mn->start_pfn);  in update_crash_elfcorehdr()
449 		size = mn->nr_pages * PAGE_SIZE;  in update_crash_elfcorehdr()
452 			pr_err("Failed to remove hot-unplugged memory from crash memory ranges\n");  in update_crash_elfcorehdr()
491  * get_fdt_index - Loop through the kexec segment array and find
496  * if found; otherwise -1.
502 	int i, fdt_index = -1;  in get_fdt_index()
505 	for (i = 0; i < image->nr_segments; i++) {  in get_fdt_index()
506 		mem = image->segment[i].mem;  in get_fdt_index()
519  * update_crash_fdt - updates the cpus node of the crash FDT.
534 	fdt = __va((void *)image->segment[fdt_index].mem);  in update_crash_fdt()
550 	if (image->file_mode)  in arch_crash_hotplug_support()
557  * arch_crash_handle_hotplug_event - Handle crash CPU/Memory hotplug events to update the
562  * Update the kdump image based on the type of hotplug event, represented by image->hp_action.
572 	switch (image->hp_action) {  in arch_crash_handle_hotplug_event()